Patent Publication Number: US-2023152729-A1

Title: Container

Description:
FIELD OF THE INVENTION AND RELATED ART 
     The present invention relates to a container for use with an image forming system and for accommodating content of powder or a liquid. 
     In general, an image forming apparatus of an electrophotographic type forms an image by transferring a toner image, formed on a surface of a photosensitive drum, onto a transfer material as a transfer medium. Further, as a toner supplying type, for example, a process cartridge type or a toner supplying (replenishing) type has been known. The process cartridge type is a type in which the photosensitive drum and a developing (developer) container are integrally assembled as a process cartridge in which the process cartridge is exchanged with a new one when toner runs out. 
     On the other hand, the toner supplying type is a type in which when the toner runs out, toner is newly supplied (replenished) to a developing container. For example, in Japanese Laid-Open Patent Applications (JP-A) 2021-26199 and 2020-154300 an image forming apparatus in which the toner is supplied to the developing container by using a toner pack mountable to a mounting portion provided on the developing container is disclosed. 
     In recent years, the image forming apparatus has been required by a user to employ various using manners such as the above-described process cartridge type, the above-described toner supplying type, and the like, and a new form has been required for a container for supplying the toner. 
     SUMMARY OF THE INVENTION 
     According to an aspect of the present invention, there is provided a container for accommodating a content of powder or a liquid, comprising: an accommodating portion configured to accommodate the content; an end portion including a rotatable member configured to rotate about a rotational axis and a discharging portion which includes a discharge opening for permitting discharge of the content to an outside of the container and which includes a passage for permitting passing of the content toward the discharge opening, wherein the end portion is on a side close to an end on a side opposite from the accommodating portion with respect to a rotational axis direction; and a flange portion extending in a radial direction of a phantom circle about the rotational axis, wherein as viewed in the rotational axis direction, an outer edge of the flange portion includes an arcuate portion which is on an outermost side of the end portion with respect to the radial direction and which is formed along the phantom circle about the rotational axis and includes a connecting portion which connects a first point and a second point on the phantom circle and which is provided in a region inside the phantom circle. 
     Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Part (a) of  FIG.  1    is a schematic view showing an image forming apparatus according to an embodiment, and part (b) of  FIG.  1    is a perspective view showing the image forming apparatus. 
         FIG.  2    is a perspective view showing an openable member and a supplying opening (port). 
       Part (a) of  FIG.  3    is an exploded perspective view of a mounting portion, and part (b) of  FIG.  3    is an exploded perspective view of the mounting portion as viewed in a direction different from the direction in part (a) of  FIG.  3   . 
       Part (a) of  FIG.  4    is a perspective view showing an outer appearance of the mounting portion when an operating lever is in a closed position, and part (b) of  FIG.  4    is a perspective view showing an outer appearance of the mounting portion when the operating lever is in an open position. 
       Part (a) of  FIG.  5    is a plan view showing the outer appearance of the mounting portion when the operating lever is in the closed position, and part (b) of  FIG.  5    is a plan view showing the outer appearance of the mounting portion when the operating lever is in the open position. 
       Part (a) of  FIG.  6    is a perspective view of an apparatus-side shutter as viewed from an upstream side of a mounting direction, and part (b) of  FIG.  6    is a perspective view of the apparatus-side shutter different in point of view from part (a) of  FIG.  6   . 
       Part (a) of  FIG.  7    is a perspective view of a cover as viewed from a downstream side of the mounting direction, and part (b) of  FIG.  7    is a perspective view of the cover as viewed from the upstream side of the mounting direction. 
       Part (a) of  FIG.  8    is a perspective view showing an accommodating container, and part (b) of  FIG.  8    is an exploded perspective view showing the accommodating container. 
       Part (a) of  FIG.  9    is a side view of a toner pack when a pack-side shutter is in a shielding position and part (b) of  FIG.  9    is a side view of the toner pack when the pack-side shutter is in an open position. 
       Part (a) of  FIG.  10    is a perspective view showing a portion-to-be-mounted which the pack-side shutter is in the shielding position, and part (b) of  FIG.  10    is another perspective view showing the portion-to-be-mounted when the pack-side shutter is in the shielding position. 
         FIG.  11    is a perspective view showing a claw portion provided on a nozzle. 
       Part (a) of  FIG.  12    is a front view showing the claw portion and part (b) of  FIG.  12    is a sectional view showing a  12 B- 12 B cross section of part (a) of  FIG.  12   . 
       Part (a) of  FIG.  13    is a front view showing the claw portion, and part (b) of  FIG.  13    is a sectional view showing a  13 B- 13 B cross section of part (a) of  FIG.  13   . 
       Part (a) of  FIG.  14    is a perspective view showing a state in which the toner pack is mounted on the apparatus-side shutter, and part (b) of  FIG.  14    is a sectional view showing the  13 B- 13 B cross section of part (a) of  FIG.  13    in a state in which mounting of the toner pack on the mounting portion is completed. 
       Part (a) of  FIG.  15    is a perspective view showing the toner pack in a state in which a cap is mounted, and part (b) of  FIG.  15    is a perspective view showing a state in which the cap is dismounted from the toner pack. 
       Part (a) of  FIG.  16    is a front view showing the cap, and part (b) of  FIG.  16    is a perspective view showing the cap. 
       Part (a) of  FIG.  17    is a sectional view showing a state in which the cap is mounted on the pack-side shutter, part (b) of  FIG.  17    is a perspective view showing a process in which the cap is being dismounted from the pack-side shutter, and part (c) of  FIG.  17    is a perspective view showing state in which the cap is dismounted from the pack-side shutter. 
       Part (a) of  FIG.  18    is a perspective view showing a state in which the toner pack is being mounted toward the mounting portion, and part (b) of  FIG.  18    is a perspective view showing the state in which the toner pack is being mounted toward the mounting portion as viewed from another angle. 
       Part (a) of  FIG.  19    is a sectional view showing the state in which the toner pack is being mounted toward the mounting portion, and part (b) of FIG.  19  is a sectional view showing a state in which the mounting of the toner pack on the mounting portion is completed. 
       Part (a) of  FIG.  20    is a sectional view showing a  20 A- 20 A cross section of part (a) of  FIG.  19   , and part (b) of  FIG.  20    is a sectional view showing a  20 B- 20 B cross section of part (a) of  FIG.  19   . 
       Part (a) of  FIG.  21    is a perspective view showing the operating lever positioned in closed position and the toner pack, and part (b) of  FIG.  21    is a perspective view showing the operating lever positioned in the open position and the toner pack. 
       Part (a) of  FIG.  22    is a sectional view showing a  22 AB- 22 AB cross section of part (b) of  FIG.  19    when both the apparatus-side shutter and the pack-side shutter are in the shielding positions, and part (b) of  FIG.  22    is a sectional view showing the  22 AB- 22 AB cross section of part (b) of  FIG.  19    when both the apparatus-side shutter and the pack-side shutter are in the open positions. 
         FIG.  23    is a schematic view of the toner pack as viewed in a dismounting direction. 
       Part (a) of  FIG.  24    is a front view showing the cap, and part (b) of  FIG.  24    is an enlarged view showing a region enclosed by a chain line of part (a) of  FIG.  24   . 
       Part (a) of  FIG.  25    is a sectional view showing a  25 A- 25 A cross section of part (b) of  FIG.  24   , part (b) of  FIG.  25    is a sectional view showing a  25 B- 25 B cross section of part (b) of  FIG.  24   , and part (c) of  FIG.  25    is a schematic view showing an area of a flat surface portion. 
         FIG.  26    is a schematic view showing a positional relationship between an extended portion and a fixing tab of an opening member. 
       Part (a) of  FIG.  27    is a bottom view of the toner pack showing a positional relationship between the fixing tab and an opening of the pack-side shutter, and part (b) of  FIG.  27    is a bottom view of a toner pack in a modified embodiment. 
       Part (a) of  FIG.  28    is a perspective view showing a toner pack, and part (b) of  FIG.  28    is a schematic view of the toner pack as viewed in a mounting direction. 
       Part (a) of  FIG.  29    is a perspective view of an accommodating container in a state in which the accommodating container is packed in a packing box, and part (b) of  FIG.  29    is a perspective view of the packing box in an open state and the accommodating container. 
         FIG.  30    is a front view showing the accommodating container in the state in which the accommodating container is packed in the packing box. 
         FIG.  31    is a perspective view showing the toner pack in a state in which a cap is mounted on the toner pack. 
       Part (a) of  FIG.  32    is a perspective view showing a mounting portion and the toner pack, and part (b) of  FIG.  32    is a perspective view showing a state in which the toner pack is mounted on the mounting portion. 
       Part (a) of  FIG.  33    is a schematic view showing a flange portion in the embodiment as viewed in the mounting direction, part (b) of  FIG.  33    is a schematic view showing a flange portion in a first modified embodiment as viewed in the mounting direction, and part (c) of  FIG.  33    is a schematic view showing a flange portion in a second modified embodiment as viewed in the mounting direction. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     In the following, exemplary embodiments for carrying out the present invention will be described while making reference to the drawings. 
     Part (a) of  FIG.  1    is a schematic view showing a structure of an image forming apparatus  1  according to an embodiment. Part (b) of  FIG.  1    is a perspective view showing the structure of the image forming apparatus  1 .  FIG.  2    is a perspective view showing an openable member  83  and a supplying port  32   a.    
     The image forming apparatus  1  is a monochromatic printer for forming an image on a recording material P on the basis of image information inputted from an external device. In the recording material P, various sheet materials different in material including papers such as plain paper and thick paper, a plastic film such as a sheet for an overhead projector, special-shaped sheets such as an envelope and index paper, a cloth, and the like are included. 
     [General Structure] 
     The image forming apparatus  1  includes, as shown in parts (a) and (b) of  FIG.  1   , an apparatus main assembly  400 , a reading device  200  supported so as to be openable relative to the apparatus main assembly  400 , and an operating portion  300  which is mounted to an outer casing surface of the apparatus main assembly  400  and which is operated by a user. The apparatus main assembly  400  includes an image forming portion  10  for forming a toner image on the recording material, a feeding portion  60  for feeding the recording material to the image forming portion  10 , a fixing portion  70  for fixing the toner image, formed by the image forming portion  10 , on the recording material, and a discharging roller pair  80 . 
     The image forming portion  10  includes a scanner unit  11 , a process unit  20  of an electrophotographic type, and a transfer roller  12  for transferring the toner image, formed on a photosensitive drum  21  of the process unit  20 , onto the recording material. The process unit  20  includes the photosensitive drum  21 , a charging roller  22  disposed at a periphery of the photosensitive drum  21 , a pre-exposure device  23 , and a developing device  30  including a developing roller  31 . 
     The photosensitive drum  21  is a photosensitive member molded in a cylindrical shape. The photosensitive drum  21  in this embodiment includes, on a drum-shaped base material molded with aluminum, a photosensitive layer formed with a negatively chargeable organic photosensitive member. Further, the photosensitive drum  21  is rotationally driven at a predetermined process speed in a predetermined direction (clockwise direction in the figure) by a motor. 
     The charging roller  22  contacts the photosensitive drum  21  at a predetermined press-contact force and forms a charging portion. Further, a desired charging voltage is applied to the charging roller  22  by a high charging voltage power source, so that the charging roller  22  electrically charges a surface of the photosensitive drum  21  uniformly to a predetermined potential. In this embodiment, the photosensitive drum  21  is charged to a negative polarity by the charging roller  22 . The pre-exposure device  23  discharges (removes) a surface potential of the photosensitive drum  21 , at a position in front of the charging portion in order to generate stable electric discharge at the charging portion. 
     The scanner unit  11  irradiates the photosensitive drum  21 , by using a polygonal mirror, with laser light corresponding to image information inputted from the external device or the reading device  200 , so that the surface of the photosensitive drum  21  is subjected to scanning exposure. By this light exposure, an electrostatic latent image depending on the image information is formed on the surface of the photosensitive drum  21 . Incidentally, the scanner unit  11  is not limited to a laser scanner device, but for example, an LED exposure device including an LED array in which a plurality of LEDs are arranged along a longitudinal direction of the photosensitive drum  21  may be employed. 
     The developing device  30  includes the developing roller  31  for carrying a developer, a developing container  32  which is a casing for the developing device  30 , and a supplying roller  33  capable of supplying the developer to the developing roller  31 . The developing roller  31  and the supplying roller  33  are rotatably supported by the developing container  32 . Further, the developing roller  31  is disposed at an opening of the developing container  32  so as to oppose the photosensitive drum  21 . The supplying roller  33  rotatably contacts the developing roller  31 , and toner as a content accommodated in the developing container  32  is applied onto the surface of the developing roller  31  by the supplying roller  33 . Incidentally, when a constitution capable of supplying the toner sufficiently to the developing roller  31  is employed, the supplying roller  33  is not necessarily be required. 
     The developing device  30  in this embodiment uses a contact development type as a development type. That is, a toner layer carried on the developing roller  31  contacts the photosensitive drum  21  at a developing portion (developing region) where the photosensitive drum  21  and the developing roller  31  oppose each other. To the developing roller  31 , a developing voltage is applied by a high developing voltage power source. Under application of the developing voltage, the toner carried on the developing roller  31  is transferred from the developing roller  31  onto the drum surface in accordance with a potential distribution of the surface of the photosensitive drum  21 , so that the electrostatic latent image is developed into a toner image. Incidentally, in this embodiment, a reversal development type is employed. That is, the toner image is formed by being deposited on a surface region of the photosensitive drum  21  attenuated in charge amount by being exposed to light in an exposure step after being charged in a charging step. 
     Further, in this embodiment, the toner which is 6 μm in particle size and of which normal charge polarity is a negative polarity is used. As the toner in this embodiment, a polymerization toner formed by a polymerization method as an example is employed. Further, the toner in this embodiment is a so-called non-magnetic one-component developer which does not contain a magnetic component and in which the toner is carried on the developing roller  31  principally by an intermolecular force or an electrostatic force (mirror force). 
     However, a one-component developer containing a magnetic component may also be used. Further, in the one-component developer, an additive (for example, wax or silica fine particles) for adjusting flowability and charging performance of the toner is contained in addition to toner particles in some cases. Further, as the developer, a two-component developer constituted by non-magnetic toner and a magnetic carrier may also be used. In the case where the developer having a magnetic property is used, as the developer carrying member, for example, a cylindrical developing sleeve inside of which a magnet is disposed is used. 
     The developing container  32  is provided with a toner accommodating portion  36  and a stirring member  34  provided inside the accommodating portion  36 . The stirring member  34  is rotated by being driven by an unshown motor, and thus stirs the toner in the developing container  32  and sends the toner toward the developing roller  31  and the supplying roller  33  by being rotated. Further, the stirring member  34  has a function of circulating the toner, peeled off from the developing roller  31  without being used for the development, in the developing container  32  and of uniformizing the toner in the developing container  32 . Incidentally, the stirring member  34  is not limited to a rotatable form. For example, a stirring member in a swingable form may also be employed. 
     Further, at an opening of the developing container  32  where the developing roller  31  is disposed, a developing blade  35  for regulating an amount of the toner carried on the developing roller  31  is disposed. The toner supplied to the surface of the developing roller  31  passes through an opposing portion to the developing blade  35  with rotation of the developing roller  31 , so that the toner is uniformly formed in a thin layer and is charged to the negative polarity by triboelectric charge. 
     A feeding portion  60  includes, as shown in parts (a) and (b) of  FIG.  1   , a front door  61  supported so as to be openable by the apparatus main assembly  400 , a tray portion  62 , an intermediary plate  63 , a tray spring  64 , and a pick-up roller  65 . The tray portion  62  constitutes a bottom of a recording material accommodating space which appears by opening the front door  61 , and the intermediary plate  63  is supported by the tray portion  62  so as to be capable of being raised and lowered. The tray spring  64  urges the intermediary plate  63  upward and presses the recording materials P, stacked on the intermediary plate  63 , against the pick-up roller  65 . Incidentally, the front door  61  closes the recording material accommodating space in a state in which the front door  61  is closed relative to the apparatus main assembly  400 , and supports the recording materials P together with the tray portion  62  and the intermediary plate  63  in a state in which the front door  61  is opened relative to the apparatus main assembly  400 . 
     The fixing portion  70  is of a heat fixing type in which an image fixing process is performed by heating and melting the toner on the recording material. The fixing portion  70  includes a fixing film  71 , a fixing heater such as a ceramic heater for heating the fixing film  71 , a thermistor for measuring a temperature of the fixing heater, and a pressing roller  72  press-contacting the fixing film  71 . 
     Next, an image forming operation of the image forming apparatus  1  will be described. When an instruction of image formation is inputted to the image forming apparatus  1 , on the basis of the image information inputted from an external computer connected to the image forming apparatus  1  or from the reading device  200 , an image forming process by the image forming portion  10  is started. The scanner unit  11  emits the laser light toward the photosensitive drum  21  on the basis of the inputted image information. At this time, the photosensitive drum  21  is charged in advance by the charging roller  22 , and is irradiated with the laser light, so that the electrostatic latent image is formed on the photosensitive drum  21 . Thereafter, this electrostatic latent image is developed by the developing roller  31 , so that the toner image is formed on the photosensitive drum  21 . 
     In parallel to the above-described image forming process, the pick-up roller  65  of the feeding portion  60  sends the recording material P supported by the front door  61 , the tray portion  62 , and the intermediary plate  63 . The recording material P is fed to a registration roller pair  15  by the pick-up roller  65 , and is abutted against a nip of the registration roller pair  15 , so that oblique movement of the recording material P is corrected. Then, the registration roller pair  15  is driven by being timed to a transfer timing of the toner image, and is conveyed toward a transfer nip formed by a transfer roller  12  and the photosensitive drum  21 . 
     To the transfer roller  12 , a transfer voltage power is applied from a high transfer voltage source, so that the toner image carried on the photosensitive drum  21  is transferred onto the recording material P conveyed by the registration roller pair  15 . The recording material P onto which the toner image is transferred is conveyed to the fixing portion  70 , where the toner image is heated and pressed when the recording material P passes through a nip between the fixing film  71  and the pressing roller  72  of the fixing portion  70 . By this, toner particles are melted and are thereafter fixed, so that the toner image is fixed on the recording material P. The recording material P passed through the fixing portion  70  is discharged to an outside of the image forming apparatus  1  (outside of the printer) by a discharging roller pair  80  as a discharging portion, so that the discharged recording materials P are stacked on a discharge tray  81  formed at an upper portion of the apparatus main assembly  400 . 
     The discharge tray  81  is inclined upward toward a downstream in a discharging direction DD of the recording material P, and the recording material P discharged on the discharge tray  81  slides down on the discharge tray  81 , so that a trailing end of the recording material is aligned by a restricting surface  84 . 
     The reading device  200  includes a reading unit  201  in which an unshown reading portion is built, and a platen (pressure plate)  202  supported by the reading unit  201  so as to be openable (closable). At an upper surface of the reading unit  201 , an original supporting platen glass  203  which permits transmission of light emitted from the reading portion and on which an original is to be placed. 
     In the case where a user intends to cause the reading device  200  to read an image of the original, the user places the original on the original supporting platen glass  203  in a state in which the platen  202  is opened. Then, the platen  202  is closed and a positional deviation of the original on the original supporting platen glass  203  is prevented, so that a reading instruction is outputted to the image forming apparatus  1  by operating the operating portion  300 , for example. When a reading operation is started, the reading portion in the reading unit  201  reciprocates in a sub-scan direction, i.e., a left-right direction in a state in which the user faces the operating portion  300  of the image forming apparatus  1  on a front (surface) side. The reading portion receives light reflected by the original by a light receiving portion while emitting light from a light emitting portion toward the original, and photoelectrically converts the light, so that the reading portion reads the image of the original. Incidentally, in the following, on the basis of a state in which the user faces the operating portion  300  on the front side, a front-rear direction, the left-right direction, and an up-down direction are defined. 
     At an upper portion of the apparatus main assembly  2 , a top cover  82  is provided, and at an upper surface of the top cover  82 , the discharge tray  81  is formed. As shown in part (b) of  FIG.  1    and  FIG.  2   , the openable member  83  is supported by the top cover  82  so as to be openable (closable) about a rotation shaft  83   a  extending in the front-rear direction. On the discharge tray  81  of the top cover  82 , an opening  82   a  which opens upward is formed. 
     The openable member  83  is constituted so as to be movable between a closed position where the openable member  83  covers a supplying port  32   a  so that a toner pack  100  cannot be mounted on the developing container  32  and an open position where the supplying port  32   a  is exposed so that the toner pack  100  can be mounted on the developing container  32 . In a state in which the openable member  83  is positioned in the open position, the toner pack  100  is moved in a mounting direction M and is mounted on the supplying port  32   a.    
     The openable member  83  functions as a part of the discharge tray  81  in the closed position. The openable member  83  and the opening  82   a  are formed on a left(-hand) side of the discharge tray  81 . Further, the openable member  83  is opened in a left(-hand) direction by being hooked with user&#39;s finger(s) from a groove portion  82   b  provided on the top cover  82 . The openable member  83  is formed in a substantially L-shape along a shape of the top cover  82 . 
     The opening  82   a  of the discharge tray  81  opens so that the supplying port  32   a  for toner supply formed at the upper portion of the developing container  32  is exposed, and the openable member  83  is opened, so that the user can access to the supplying port  32   a . Incidentally, in this embodiment, a type (direct supply type) in which the user supplies the toner from the toner pack  100  (see, parts (a) and (b) of  FIG.  1   ), filled with the toner for supply, to the developing device  30  kept in a state in which the developing device  30  is mounted in the image forming apparatus  1  is employed. The toner pack  100  is exposed to the outside at least at a part thereof in a state in which the toner pack  100  is mounted on the mounting portion  106  (see, parts (a) and (b) of  FIG.  22   ). 
     For this reason, in the case where a remaining toner amount of the process unit  20  becomes small, an operation in which the process unit  20  is taken out of the apparatus main assembly  400  and is exchanged with a new process unit becomes unnecessary, so that usability can be improved. Further, the toner can be supplied to the developing container  32  more inexpensively than exchange of entirety of the process unit  20 . Incidentally, the direct supply type can be reduced in cost since there is no need to exchange various rollers and gears, and the like even when compared with the case where only the developing device  30  of the process unit  20  is exchanged. Incidentally, the image forming apparatus  1  and the toner pack  100  constitute an image forming system  1000 . 
     [Mounting Portion] 
     Next, using part (a) of  FIG.  3    to part (b) of  FIG.  7   , a constitution (structure) of the mounting portion  106  on which the toner pack  100  is mounted will be described. In this embodiment, the mounting portion  106  is a unit for mounting the toner pack  100  including the supplying part  32   a  and is provided in the image forming apparatus  1  (see,  FIG.  2   ). Part (a) of  FIG.  3    is an exploded perspective view of the mounting portion  106 . Part (b) of  FIG.  3    is an exploded perspective view of the mounting portion  106  as viewed from a direction different from the direction in part (a) of  FIG.  3   . Part (a) of  FIG.  4    and part (a) of  FIG.  5    are a perspective view showing an outer appearance of the mounting portion  106  and a schematic view of the mounting portion  106  as viewed in the mounting direction M, respectively, when an operating lever  108  is in a closed position. Part (b) of  FIG.  4    and part (b) of  FIG.  5    are a perspective view showing an outer appearance of the mounting portion  106  and a schematic view of the mounting portion  106  as viewed in the mounting direction M, respectively, when the operating lever  108  is in an open position. 
     Part (a) of  FIG.  6    is a perspective view of an apparatus-side shutter  109  as viewed from an upstream side of the mounting direction M. Part (b) of  FIG.  6    is a perspective view of the apparatus-side shutter  109  different in point of view from part (a) of  FIG.  6   . Part (a) of  FIG.  7    is a perspective view of a cover  110  as viewed from a downstream side of the mounting direction M. Part (b) of  FIG.  7    is a perspective view of the cover  110  as viewed from an upstream side of the mounting direction M. 
     As shown in part (a) of  FIG.  3    to part (b) of  FIG.  4   , the mounting portion  106  includes a main body base portion  2 , and the main body base portion  2  includes a first frame  107 , a second frame  117 , and the cover  110 . The cover  110  and the second frame  117  are fixed to the first frame  107 . As shown in parts (a) and (b) of  FIG.  7   , the cover  110  includes a portion-to-be-engaged  110   h  engaged with a positioning portion  107   a  of the first frame  107  so as not to be rotated about a rotational axis B relative to the first frame  107 . Further, with respect to the mounting portion M, on a side downstream of the cover  110 , i.e., on a bottom side, a cut-away portion  110   k  is provided, and the cut-away portion  110   k  is provided with a first restricting surface  110   c  and a second restricting surface  110   d . The first restricting surface  110   c  and the second restricting surface  110   d  are provided so as to oppose each other with respect to a circumferential direction about the rotational axis B. 
     Incidentally, the first frame  107 , the cover  110 , and the second frame  117  may be integrally constituted, not as separate members. As shown in parts (a) and (b) of  FIG.  3   , the second frame  117  is provided with an apparatus-side opening  117   a , and the apparatus-side opening  117   a  communicates with a toner accommodating portion  36  (see, part (a) of  FIG.  1   ) of the developing container  32 . 
     Each of the operating lever  108  and the apparatus-side shutter  109  is mounted on the main body base portion  2  so as to be rotatable about the rotational axis B. The first frame  107  is provided with the positioning portion  107   a . The positioning portion  107   a  projects inward from an inner peripheral surface about the rotational axis B of the first frame  107  in a radial direction r of a phantom circle (virtual circle) VC about the rotational axis B. 
     Further, the operating lever  108  as an open positioning portion is provided with a drive transmitting portion  108   a  and an open positioning portion  108   b . A user is capable of rotating the operating lever  108  about the rotational axis B relative to the main body base portion  2  by open positioning the open positioning portion  108   b.    
     The drive transmitting portion  108   a  is a projected portion projected inward from an inner peripheral surface about the rotational axis B of the operating lever  108  in the radial direction r of the phantom circle VC about the rotational axis B. 
     As shown in parts (a) and (b) of  FIG.  6   , the apparatus-side shutter  109  as a main apparatus shutter includes an inner peripheral surface  109   h , a receiving port (opening)  109   a  provided in the inner peripheral surface  109   h  and for receiving the toner from the toner pack  100 , and a bottom  109   b . The apparatus-side shutter  109  further includes a center boss  109   d  provided on the bottom  109   b , a pack contact surface  109   g , a rib-to-be-restricted  109   c , and a portion  109   e  to which drive is transmitted and which is provided on the inner peripheral surface  109   h . The portion  109   e  to which drive is transmitted is a projected portion projected inward in the radial direction r of the phantom circle VC about the rotational axis B as shown in part (b) of  FIG.  6   . To the inner peripheral surface  109   h , an apparatus-side seal  111  is applied so as to surround the receiving port  109   a  (see, part (b) of  FIG.  4   ). 
     The apparatus-side shutter  109  is constituted so as to take a shielding position and an open position relative to the main body base portion  2 . Specifically, the apparatus-side shutter  109  is, as shown in parts (a) and (b) of  FIG.  6   , rotated in an arrow K direction from the shielding position toward the open position and rotated in an arrow L direction from the open position toward the shielding position. Incidentally, these arrow K direction and arrow L direction are similar to arrow K direction and arrow L direction, respectively, of the pack-side shutter  103 . As regards the apparatus-side shutter  109 , in the shielding position, the receiving port  109   a  is shielded by the apparatus-side seal  111  and the cover  110 , and in the open position, the receiving port  109   a  is opened without being covered by the cover  110 . That is, the receiving port  109   a  does not communicate with the apparatus-side opening  117   a  of the second frame  117  when the apparatus-side shutter  109  is positioned in the shielding position, and communicates with the apparatus-side opening  117   a  of the second frame  117  when the apparatus-side shutter  109  is positioned in the open position. 
     In part (a) of  FIG.  4    and part (a) of  FIG.  5   , the apparatus-side shutter  109  is positioned in the shielding position, and at this time, the receiving port  109   a  of the apparatus-side shutter  109  does not communicate with the apparatus-side opening of the second frame  117 . Further, in part (b) of  FIG.  4    and part (b) of  FIG.  5   , the apparatus-side shutter  109  is positioned in the open position, and at this time, the receiving port  109   a  of the apparatus-side shutter  109  communicates with the apparatus-side opening of the second frame  117 . The apparatus-side shutter  109  is moved to the open position, whereby the toner can be supplied (replenished) from the toner pack  100  to the toner accommodating portion  36  of the developing container  32  through the receiving port  109   a.    
     Incidentally, the operating lever  108  and the apparatus-side shutter  109  are not drive-connected to each other, and therefore, even when the operating lever  108  is open positioned in a state in which the toner pack is not mounted, the apparatus-side shutter  109  is not rotated. 
     As shown in part (a) of  FIG.  6    to part (b) of  FIG.  7   , the apparatus-side shutter  109  is constituted so as to be rotatable about the center boss  109   d  by engaging a large-diameter portion  109   d   1  of the center boss  109   d  with a cylindrical portion  110   j  of the cover  110 . Here, the rib-to-be-restricted  109   c  provided on the bottom  109   b  of the apparatus-side shutter  109  is positioned between the first restricting surface  110   c  and the second restricting surface  110   d  of the cover  110 . For this reason, the apparatus-side shutter  109  is rotatable only in movable range of the rib-to-be-restricted  109   c  between the first restricting surface  110   c  and the second restricting surface  110   d . In other words, the apparatus-side shutter  109  is restricted in rotation range between the shielding position and the open position by the first restricting surface  110   c  and the second restricting surface  110   d  of the cover  110 . For example, in a state in which the rib-to-be-restricted  109   d  contacts the first restricting surface  110   c , the apparatus-side shutter  109  positioned in the shielding position cannot be rotated in the arrow L direction, i.e., a direction opposite to a direction toward the open position. 
     [Structure of Accommodating Container] 
     Next, using part (a) of  FIG.  8    to part (b) of  FIG.  9   , a basic structure of an accommodating container  800  including the toner pack  100  will be described. The toner pack  100  is mounted on the above-described mounting portion  106 . Part (a) of  FIG.  8    is a perspective view showing the accommodating container  800 . Part (b) of  FIG.  8    is an exploded perspective view showing the accommodating container  800 . Part (a) of  FIG.  9    is side view of the toner pack  100  when the pack-side shutter  103  is in the shielding position. Part (b) of  FIG.  9    is a side view of the toner pack  100  when the pack-side shutter  103  is in the open position. 
     The accommodating container  800  as a container includes, as shown in parts (a) and (b) of  FIG.  8   , the toner pack  100 , and a cap  120 . Incidentally, the accommodating container  800  and the image forming apparatus  1  constitute an image forming system  1000  (see, part (a) of  FIG.  1   ). The toner pack  100  includes a pouch  101  for accommodating a content such as the toner, an opening member  104  connected to an opening  101   a  of the pouch  101 , a portion-to-be-mounted  700  mounted on the mounting portion  106 . The portion-to-be-mounted  700  as a top end portion includes a nozzle  102  connected to the opening member  104 , and includes the pack-side shutter  103 . The cap  120  is detachably mounted on the portion-to-be-mounted  700  but will be specifically described later. 
     The pouch  101  as an accommodating portion has flexibility, and is provided on one end side of the toner pack  100  with respect to an axial direction D 1  which is a direction of a rotational axis A of the pack-side shutter  103 . The rotational axis A coincides with the rotational axis B of the apparatus-side shutter  109  when the toner pack  100  is mounted on the mounting portion  106 , and therefore, in the following, both the directions of the rotational axis A and the rotational axis B are referred to as the axial direction D 1 . 
     The nozzle  102  and the pack-side shutter  103  are provided on the other end side of the toner pack  100  with respect to the axial direction D 1 . The pouch  101  is formed by subjecting, for example, a flexible sheet to pouch processing, and has a bag shape such that one end portion thereof opens through the opening  101   a . Incidentally, the pouch  101  may also be a bottle made of a resin material or a container made of paper or a vinyl resin material. 
     The opening member  104  as an intermediary member is an annular resin member provided with a through hole  104   a  and is fixed to the opening  101   a  of the pouch  101 . In this embodiment, the opening member  104  is formed of a polypropylene resin material and is larger in thickness than the pouch  101  which is the flexible sheet, and this has high rigidity. In other words, the pouch  101  has first rigidity, and the opening member  104  has second rigidity higher than the first rigidity. By this, even the flexible pouch  101  is capable of maintaining a state in which the opening  101   a  opens. 
     Further, the opening member  104  is connected to the nozzle  102  and is provided with the through hole  104   a . That is, the opening member  104  connects the pouch  101  with the portion-to-be-mounted  700  so that the pouch  101  and the portion-to-be-mounted  700  including the nozzle  102  communicate with each other. 
     Further, the opening member  104  includes a pair of extended portions  104   b  extended so as to be spaced from the rotational axis A with respect to the radial direction r of the phantom circle VC about the rotational axis A. The pair of extended portions  104   b  are disposed at phases which are different from each other by 180 degrees with respect to a circumferential direction about the rotational axis A. Thus, outer peripheral surface of the opening member  104  is not a uniform circumferential surface about the rotational axis A, and therefore, the user is capable of stably holding the opening member  104  by grasping the extended portions  104   b . That is, the extended portions  104   b  function as non-slip portions so that user&#39;s hands do not slip with respect to a rotational direction about the rotational axis A. 
     Incidentally, the nozzle  102  as a discharging portion is connected to the opening member  104 , but a connecting method may be any method. For example, as the connecting method, a method using various adhesives such as a hot-melt adhesive, a method in which the through hole  104   a  of the opening member  104  is thermally welded to an outer periphery of the nozzle  102 , and the like method may be used. A connecting method of the pouch  101  with the opening member  104  may be any method. 
     The nozzle  102  includes a side surface  102   c  as an outer surface extending along the rotational axis A, and the side surface  102   c  is provided with a discharging port  102   a  constituted so as to communicate with an inside of the pouch  101  and provided with a recessed portion  102   e . The recessed portion  102   e  is provided in a position different from the discharging port  102   a  with respect to a rotational direction of the pack-side shutter  103 . The toner accommodated in the pouch  101  is constituted so as to be discharged to an outside of the toner pack  100  through for discharging port  102   a  by being compressed (squeezed) by the user and thus by being decreased in volume of the pouch  101 . That is, inside the nozzle  102 , a passage  102   g  (see, part (a) of  FIG.  19   ) constituted so that the toner (content) passes toward a discharge opening (discharging port)  102   a  along the passage  102   g  is formed. 
     Incidentally, the nozzle  102  may be constituted integrally with the opening member  104 . Further, a constitution in which a seal is provided between the pouch  101  and the discharge opening  102   a  of the nozzle  102  and in which the pouch  101  and the discharge opening  102   a  communicate with each other in the case where the seal is removed may be employed. 
     Outside the side surface  102   c  of the nozzle  102 , the pack-side shutter  103  as a rotatable member is disposed. The pack-side shutter  103  is provided rotatably about the rotational axis A extending in the direction along the axial direction D 1  and is provided with an opening  103   a . Specifically, an inner peripheral surface  103   m  of the pack-side shutter  103  is slidably supported by an annular rib  104   m  of the opening member  104 . The pack-side shutter  103  is provided outside the side surface  102   c  with respect to the radial direction r of the phantom circle VC about the rotational axis A and is capable of shielding the discharge opening  102   a . An arcuate surface of the side surface  102   c  is a curved surface projected toward an outside with respect to the radial direction r. 
     An inside surface of the pack-side shutter  103 , i.e., a surface opposing the side surface  102   c  is a curved surface extending along the side surface  102   c  of the nozzle  102 , and a rectangular pack-side seal  105  is mounted on the curved surface. 
     The pack-side shutter  103  is constituted so as to be rotatable between a shielding position (position shown in part (a) of  FIG.  9   ) where the pack-side seal  105  shields the discharging port  102   a  of the nozzle  102  and an open position (position shown in part (b) of  FIG.  9   ) where the discharging port  102   a  is open. When the pack-side shutter  103  is in the open position, the discharging port  102   a  of the nozzle  102  is exposed from an opening  103   a  provided in the pack-side shutter  103 . That is, the pack-side shutter  103  is provided with the opening  103   a  so as to open the discharging port  102   a  when the pack-side shutter  103  is in the open position. 
     When the pack-side shutter  103  positioned in the shielding position as a first shielding position shown in part (a) of  FIG.  9    is rotated about the rotational axis A in an arrow K direction, the pack-side shutter  103  reaches the open position as a first open position shown in part (b) of  FIG.  9   . On the contrary, when the pack-side shutter  103  positioned in the open position is rotated in an arrow L direction, the pack-side shutter  103  reaches the shielding position. That is, the arrow K direction as a first rotational direction is a direction from the shielding position toward the open position with the rotational axis as a center, and the arrow L direction as a second rotational direction is a direction from the open position toward the shielding position with the rotational axis A as the center. 
     In a rotating operation of the pack-side shutter  103 , the pack-side shutter  103  slides on the side surface  102   c  of the nozzle  102  through the pack-side seal  105 . 
     Next, using part (a) of  FIG.  8    to part (b) of  FIG.  10   , a detailed structure of the nozzle  102  and the pack-side shutter  103  will be described. Part (a) of  FIG.  10    is a perspective view showing the portion-to-be-mounted  700  when the pack-side shutter is positioned in the shielding position. Part (b) of  FIG.  10    is another perspective view showing the portion-to-be-mounted  700  when the pack-side shutter  103  is in the shielding position. 
     As shown in part (a) of  FIG.  8    to part (b) of  FIG.  10   , the nozzle  102  includes a portion-to-be-positioned  102   d  including surfaces opposing each other with respect to a circumferential direction about the rotational axis A. The portion-to-be-positioned  102   d  engages with the positioning portion  107   a  (see, part (a) of  FIG.  4   ) of the first frame  107  when the toner pack  100  is mounted on the mounting portion  106 . By this, a position of the nozzle  102  relative to the first frame  107  (main body base portion  2 ) with respect to a rotational direction about the rotational axis A is determined. 
     With respect to the direction of the rotational axis A, on a side downstream of the portion-to-be-positioned  104   d  with respect to the mounting direction M, each of a surface  102   e   1  and a surface  102   e   2  is provided. A side surface  102   e   3  is provided between the surface  102   d   1  and the surface  102   d   2  and between the surface  102   e   1  and the surface  102   e   2 . The side surface  102   e   3  is recessed inward from the side surface  102   c  with respect to the radial direction r. The portion-to-be-positioned  102   d , the surface  102   e   1 , the surface  102   e   2 , and the side surface  102   e   3  form the recessed portion  102   e.    
     Further, the pack-side shutter  103  has a side surface  103   d  provided with the opening  103   a . The side surface  103   d  extends along the rotational axis A. As shown in part (a) of  FIG.  10   , when the pack-side shutter  103  is positioned in the shielding position, at least a part of the recessed portion  102   e  of the nozzle  102  is exposed from the opening  103 . This is because when the toner pack  100  is mounted on the mounting portion  106  in the state in which the pack-side shutter  103  is positioned in the shielding position, the portion-to-be-positioned  102   d  of the recessed portion  102   e  is engaged with the positioning portion  107   a.    
     Further, the pack-side shutter  103  is provided with a portion  103   e  to which drive is transmitted on a side opposite from the opening  103   a  with respect to the rotational axis A. In the case where the pack-side shutter  103  is positioned in the shielding position, the portion  103   e  to which drive is transmitted is provided on a side opposite from the recessed portion  102   e  of the nozzle with respect to the rotational axis A. The portion  103   e  to which drive is transmitted includes a surface  103   b   1 , a surface  103   b   2 , and a side surface  103   b   3 , and is capable of engaging with the drive transmitting portion  108   a . The side surface  103   b   3  is provided between the surface  103   b   1  and the surface  103   b   2 , and is recessed inward from the side surface  103   d  with respect to the radial direction r. Further, at an upstream end portion of the pack-side shutter  103  with respect to the mounting direction M, a flange portion  103   i  extended from the side surface  103   d  on an outside of the side surface with respect to the radial direction r, i.e., in a direction spaced from the rotational axis A is provided. The flange portion  103  is provided with a cap fixing portion  103   n  as a fixing portion described later. Specifically, the cap fixing portion  103   n  is provided in a region between the side surface  103   d  of the pack-side shutter  103  and an arcuate portion  103   g  (see part (b) of  FIG.  28   ) described later. 
     Next, a projected portion  102   b  of the nozzle  102  will be specifically described. As shown in parts (a) and (b) of  FIG.  9   , the toner pack  100  is directed to an attitude such that a first end portion side (the pouch  101  side) and a second end portion side (the nozzle  102  side) of the toner pack  100  are positioned so that the second end portion side is below the first end portion side. Or, the toner pack  100  is directed so that at least a part of the nozzle  102  is positioned below the pouch  101  and so that the rotational axis A is parallel to a vertical direction VD. This attitude is an attitude when the toner pack  100  is mounted on the mounting portion  106  of the image forming apparatus  1 . At this time, in part (a) of  FIG.  9    to part (b) of  FIG.  10   , the mounting direction M is a downward direction, and a dismounting direction U is an upward direction. 
     The pack-side shutter  103  has an end surface  103   c  which is a lower end portion with respect to the vertical direction VD and constituting a bottom of the pack-side shutter. The nozzle  102  includes the projected portion  102   b  projected toward a downstream of the end surface  103   c  of the pack-side shutter  103  with respect to the mounting direction M, i.e., projected below the end surface  103   c . The projected portion  102   b  is a cylindrical portion (portion having a cylindrical shape) about the rotational axis A. The projected portion  102   b  has a projected portion end surface  102   b   2  which is a lower end surface. The projected portion end surface  102   b   2  is provided with a hole defined by an inner peripheral surface  102   b   1  about the rotational axis A. Further, as shown in part (b) of  FIG.  8   , the projected portion  102   b  is projected downward more than the lower end surface  102  of the nozzle  102  is. Incidentally, in this embodiment, the end surface  103   c  and the end surface  102   j  of the nozzle  102  are end surfaces perpendicular to the rotational axis A, but the present invention is not limited thereto. These surfaces may only be required to be surfaces extending in a direction crossing the rotational axis A as viewed in a direction perpendicularly to the rotational axis A. Further, the projected portion  102   b  is not necessarily be provided on the nozzle  102 . 
     Here, as shown in  FIG.  11   , the nozzle  102  of the toner pack  100  is provided with a claw portion  102   f  as a locking mechanism so that the pack-side shutter  103  is not rotated relative to the nozzle  102  when the toner pack  100  is transported or is treated alone by the user. The pack-side shutter  103  is held in the shielding position by the claw portion  102   f , so that the toner which is the content in the toner pack  100  can be prevented from leaking out to the outside. 
       FIG.  11    is a perspective view showing the claw portion  102   f  provided on the nozzle  102 . Part (a) of  FIG.  12    is a front view showing the claw portion  102   f . Part (b) of  FIG.  12    is a sectional view showing a  12 B- 12 B cross section of part (a) of  FIG.  12   . Part (a) of  FIG.  13    is a front view showing the claw portion  102   f . Part (b) of  FIG.  13    is a sectional view showing a  13 B- 13 B cross section of part (a) of  FIG.  13   . Part (a) of  FIG.  14    is a perspective view showing a state when the toner pack  100  is being mounted on (in) the apparatus-side shutter  109 . Incidentally, in part (a) of  FIG.  14   , the pouch  101  and the pack-side shutter  103  of the toner pack  100  are omitted from illustration, and only the nozzle  102  and the opening member  104  are illustrated. Part (b) of  FIG.  14    is a sectional view showing the  13 B- 13 B cross section of part (a) of  FIG.  13    in a state in which the mounting of the toner pack  100  on the mounting portion  106  is completed. 
     The claw portion  102   f  as a second restricting portion includes, as shown in  FIG.  11    to part (b) of  FIG.  12   , an arm portion  102   f   3 , an inclined releasing surface  102   f   1 , and an abutting portion  102   f   2 . The claw portion  102   f   2  is movable in the radial direction r of the phantom circle VC about the rotational axis by elastic deformation of the arm portion  102   f   3 . Specifically, the claw portion  102   f  is movable to a restricting position shown in part (b) of  FIG.  12    and a non-restricting position which is an inside position than the restricting position with respect to the radial direction r and which is shown in part (b) of  FIG.  14   . 
     The cutting portion  102   f   2  opposes a restricting portion  103   h  of the pack-side shutter  103  positioned in the shielding position when the claw portion  102   f  is positioned in the restricting position as shown in part (b) of  FIG.  12    with respect to the circumferential direction about the rotational axis A. At this time, a gap s is provided between the abutting portion  102   f   2  and the restricting portion  103   h . Rotation of the pack-side shutter  103  in the arrow K direction is restricted by abutment of the restricting portion  103   h  against the abutting portion  102   f   2 . Incidentally, a size of the gap s may be set arbitrarily, a rotation range in which the pack-side shutter  103  is rotatable within a range of the gap s is regarded as the shielding position. That is, the rotation of the pack-side shutter  103  from the shielding position in the arrow K direction is restricted by the claw portion  102   f  positioned in the restricting position. 
     Further, when the claw portion  102   f  is positioned in the non-restricting position, the abutting portion  102   f   2  is positioned inside the restricting portion  103   h  of the pack-side shutter  103  with respect to the radial direction r of the phantom circle VC about the rotational axis A. For this reason, the pack-side shutter  103  is capable of being rotated about the rotational axis A without interfering with the abutting portion  102   f   2 . 
     As shown in part (a) of  FIG.  6    and part (b) of  FIG.  14   , the apparatus-side shutter  109  is provided with a restriction releasing rib  109   j  extending in the axial direction D 1 . The restriction releasing rib  109   j  is contactable to the inclined releasing surface  102   f   1  of the claw portion  102   f  when the toner pack  100  is mounted on the mounting portion  106 . Incidentally, as shown in part (a) of  FIG.  10    and part (b) of  FIG.  14   , the pack-side shutter  103  is provided with an opening  103   j  extends from the end surface (bottom)  103   c  to the side surface  103   d  of the pack-side shutter  103 . The restriction releasing rib  109   j  provided in the apparatus-side shutter  109  penetrates through the opening  103   j  and is capable of contacting the inclined releasing surface  102   f   1  of the claw portion  102   f  disposed inside the pack-side shutter  103 . 
     The inclined releasing surface  102   f   1  is inclined with respect to the mounting direction M (axial direction D 1 ) so as to extend inward in the radial direction r toward a downstream of the mounting direction M. Further, when the toner pack  100  is mounted on the mounting portion  106 , the inclined releasing surface  102   f   1  converts a direction of a force received from the restrict releasing rib  109   j  by the claw portion  102   f  into an inward direction with respect to the radial direction r. By this, the claw portion  102   f  is moved inward from the restricting position to the non-restricting position in the radial direction r by pressing the inclined releasing surface  102   f   1  by the restriction releasing rib  109   j . In other words, when the toner pack  100  is mounted on the mounting portion  106 , the claw portion  102   f  is moved from the restricting position to non-restricting position by being pressed by the mounting portion  106 . 
     The above-described abutting portion  102   f   2  of the claw portion  102   f  abuts against the restricting portion  103   h  of the pack-side shutter  103  and thus restricts rotation of the pack-side shutter  103  in the arrow K direction. Next, a constitution in which rotation of the pack-side shutter  103  in the arrow L direction opposite to the arrow K direction will be described. 
     As shown in part (b) of  FIG.  13   , the pack-side shutter  103  includes a rotation restricting rib  103   k , and the nozzle  103  includes a rotation restricting surface  102   k  as a first restricting portion opposing the rotation restricting rib  103   k  with respect to the circumferential direction about the rotational axis A. When the pack-side shutter  103  is positioned in the shielding position, the rotation restricting rib  103   k  opposes the rotation restricting surface  102   k  with a small gap therebetween. Then, when the pack-side shutter positioned in the shielding position is intended to be rotated in the arrow L direction, the rotation restricting rib  103   k  abuts against the rotation restricting surface  102   k , so that the rotation of the pack-side shutter  103  in the arrow L direction is restricted. 
     As shown in parts (a) and (b) of  FIG.  13   , the claw portion  102   f  is disposed downstream of the rotation restricting surface  102   k  and the rotation restricting rib  103   k  with respect to the mounting direction M. This is because the claw portion  102   f  is disposed in a position where the claw portion  102   f  is easily pressed by the restriction releasing rib  109   j  of the apparatus-side shutter  109  when the toner pack  100  is mounted on the mounting portion  106 . By this, the size of the opening  103   j  provided in the pack-side shutter  103  can be made small, so that it is possible to not only ensure rigidity of the pack-side shutter  103  but also suppress access to the claw portion  102   f  by the user. Incidentally, arrangement of the claw portion  102   f , the rotation restricting surface  102   k , and the rotation restricting rib  103   k  is not limited thereto, but may also be arbitrarily changed. 
     As described above, in a state in which the toner pack  100  is mounted on the mounting portion  106 , the rotation of the pack-side shutter  103  in each of the arrow K direction and the arrow L direction is restricted, so that the pack-side shutter  103  is easily held at the shielding position. When the pack-side shutter  103  is rotated in the arrow K direction in a state in which the toner pack  100  is mounted on the mounting portion  106  and in which the claw portion  102   f  is positioned in the non-restricting position, the discharging port  102   a  of the nozzle  102  is exposed as shown in part (b) of  FIG.  9   . 
     Further, as shown in part (b) of  FIG.  8    and parts (a) and (b) of  FIG.  10   , the pack-side shutter  103  is provided with three radial direction positioning portions  103   f . These radial direction positioning portions  103   f  project toward an outside from the side surface  103   d  in the radial direction r. Each of the radial direction positioning portions  103   f  is disposed on an upstream side of the pack-side shutter  103  with respect to the mounting direction M. 
     [Cap] 
     Next, a cap  120  mounted on the toner pack  100  will be described using parts (a) and (b) of  FIG.  8    and part (a) of  FIG.  15    to part (c) of  FIG.  17   . Part (a) of  FIG.  15    is a perspective view showing the toner pack  100  in a state in which the cap  120  is mounted on the toner pack  100 . Part (b) of  FIG.  15    is a perspective view showing a state in which the cap  120  is dismounted from the toner pack  100 . Part (a) of  FIG.  16    is a front view showing the cap  120 . Part (b) of  FIG.  16    is a perspective view showing the cap  120 . Part (a) of  FIG.  17    is a perspective view showing a state in which the cap  120  is mounted on the pack-side shutter  103 . Part (b) of  FIG.  17    is a perspective view showing a process in which the cap  120  is being dismounted from the pack-side shutter  103 . Part (c) of  FIG.  17    is a perspective view showing a state in which the cap  120  is dismounted from the toner pack  100 . Incidentally, in parts (a) and (b) of  FIG.  17   , an outer configuration of the cap  120  is indicated by a dotted line. 
     As shown in parts (a) and (b) of  FIG.  8    and part (a) of  FIG.  15    to part (b) of  FIG.  16   , the cap  120  is mounted on the portion-to-be-mounted  700  constituted by the nozzle  102  and the pack-side shutter  103  of the toner pack  100 . The cap  120  is mounted on the portion-to-be-mounted  700 , and covers at least a part of the portion-to-be-mounted  700 . Specifically, a cap main body portion  120 U 1  described later of the cap  120  surrounds at least a part of the side surface  103   d  as an outer side surface of the pack-side shutter  103 . In this embodiment, the cap  120  is mounted on the pack-side shutter  103  by being engaged with a recessed screw portion  103   g  as a container shutter-side screw portion provided on the side surface  103   d  of the pack-side shutter  103 . 
     The cap  120  includes the cap main body portion  120 U 1  as a main body portion, a fixing tab  120 U 2  as a fixing portion, and a connecting portion  120 U 3  connecting the cap main body portion  120 U 1  and the fixing tab  120 U 2 . In this embodiment, the cap main body portion  120 U 1  is formed in a cylindrical shape extending in the axial direction of the rotational axis A, but is not limited thereto. That is, the cap main body portion  120 U 1  may only be constituted in the cylindrical shape extending in the axial direction of the rotational axis A, and may also be constituted in a polygonal cylindrical shape, for example. 
     The cap main body portion  120 U 1  includes a cap opening  120   a , a bottom  120   b , an inner peripheral surface  120   c , an annular rib  120   d , a projected screw portion  120   e , and a cap outer surface  120   f  The cap opening  120   a  as an opening is provided at one end of the cap main body portion  120 U 1  with respect to the axial direction D 1  of the rotational axis A. The annular rib  120   d  extends from a surface  120   g , opposite from the bottom  120   b , toward a downstream side, i.e., upward with respect to the dismounting direction U. The surface  120   g  opposes the end surface  103   c  of the pack-side shutter  103  and the projected portion  120   b  of the nozzle  102 . The projected screw portion  120   e  as a cap-side screw portion is provided on the inner peripheral surface  120   c  extending along the rotational axis A and projects from the inner peripheral surface  120   c  toward the inside in the radial direction r. The projected screw portion  120   e  is capable of engaging with the recessed screw portion  103   g  of the pack-side shutter  103  by rotating the cap main body portion  120 U 1  in the arrow K direction. The projected screw portion  120   e  is engaged with the recessed screw portion  103   g , so that the cap main body portion  120 U 1  is mounted on the pack-side shutter  103 . Incidentally, the inner peripheral surface  120   c  of the cap  120  is constituted so as to surround at least a part of the side surface  103   d  of the pack-side shutter  103 , and surrounds entirety of the side surface  103   d  in this embodiment. 
     Here, the case where the accommodating container  800  including the toner pack  100  and the cap  120  is directed so that the rotational axis thereof is parallel to the vertical direction VD and so that the nozzle  102  is positioned below the pouch  101  will be considered. Such an attitude of the accommodating container  800  is similar to an attitude when the toner pack  100  is mounted on the mounting portion  106 . At this time, the annular rib  120   d  extends upward from the surface  120   g . Further, the bottom  120   b  is a surface which is an end surface of the cap  120  with respect to the mounting direction M and which is perpendicular to the rotational axis A, and constitutes the bottom of the accommodating container  800  in the state in which the cap  120  is mounted on the toner pack  100 . Further, the bottom  120   b  extends in the horizontal direction when the accommodating container  800  is in the attitude shown in part (a) of  FIG.  16   . For this reason, the accommodating container  800  is constituted so as to be capable of being self-standing by contact of the bottom  120   b  with an installation surface. 
     The cap  120  is mounted on the pack-side shutter  103  of the portion-to-be-mounted  700  so as to cover the portion-to-be-mounted  700  of the toner pack  100 . At this time, the annular rib  120   d  of the cap  120  is provided outside the projected portion  102   b  of the nozzle  102  with respect to the radial direction r and is provided so as to surround the projected portion  120   b . In other words, the annular rib  120   d  as a projected cap portion is disposed so as not to overlap with the projected portion  102   b  as viewed in the vertical direction (the dismounting direction or the mounting direction M). 
     For this reason, even when the cap  120  is shocked externally during transportation or the like, the cap  120  is capable of protecting the projected portion  102   b . A projected portion end surface  120   b   2  of the projected portion  102   b   2  is, as described later, abutted against a pack contact surface  109   g  (see, part (a) of  FIG.  6   ) of the apparatus-side shutter  109  when the toner pack  100  is mounted on the mounting portion  106 , and performs positioning of the toner pack  100  with respect to the mounting direction M. Accordingly, the projected portion end surface  102   b   2  is protected by the cap  120 , so that positioning accuracy of the toner pack  100  relative to the mounting portion  106  with respect to the mounting direction M can be improved. 
     Further, as shown in part (b) of  FIG.  8    and parts (a) and (b) of  FIG.  15   , in the state in which the cap  120  is mounted on the toner pack  100 , the cap opening  120   a  is disposed downstream of the portion-to-be-positioned  102   d  and the portion  103   e  to which drive is transmitted with respect to the dismounting direction U. That is, the portion-to-be-positioned  102   d  and the portion  130   e  to which drive is transmitted are covered and protected by the cap outer surface  120   f  as an outer surface of the cap  120 . Incidentally, the portion-to-be-positioned  102   d  is used for positioning the nozzle  102  relative to the first frame  107  (the main apparatus base portion  2 ) with respect to the rotational direction about the rotational axis A. The portion  103   e  to which drive is transmitted is used in a rotational operation of the pack-side shutter  103  by the operating lever  108  by being engaged with the drive transmitting portion  108   a  of the operating lever  108 . 
     Further, portions of the portion-to-be-mounted  700  of the toner pack  100  other than the recessed screw portion  103   g  are spaced from the inner peripheral surface  120   c  of the cap  120 . By this, the respective portions of the portion-to-be-mounted  700  are protected from the shock by the cap  120 . 
     Further, in the state in which the cap  120  is mounted on the portion-to-be-mounted  700  of the toner pack  100 , even when the toner leaks out through the discharging port  120   a  of the nozzle  102 , the cap  120  receives the leaked toner. For this reason, the user is capable of reducing a degree of deposition of the toner on user&#39;s hand(s) or the like without touching the leaked toner. Incidentally, in the case where the content accommodated in the toner pack  100  is a liquid, the toner leaked out onto the cap  120  is dried on the cap  120  with a lapse of time. By this, it is possible to reduce a degree of deposition of the content on the user&#39;s hand(s) or the like. 
     The fixing tab  120 U 2  of the cap  120  is connected to the cap opening  120   a  of the cap main body portion  120 U 1  through the connecting portion  120 U 3 . In a state in which the cap  120  is not dismounted once from the portion-to-be-mounted  700  and the toner pack  100  is unused, the fixing tab  120 U 2  is fixed to the cap fixing portion  103   n  provided on the flange portion  103   i  of the pack-side shutter  103 . That is, the fixing tab  120 U 2  is fixed only to a part of the flange  103   i  with respect to the circumferential direction of the phantom circle VC about the rotational axis A. Specifically, as shown in  FIG.  26   , as viewed in the direction of the rotational axis A, the fixing tab  120 U 2  is provided within a region AR 3  of 90 degrees in circumferential angle about the phantom circle VC about the rotational axis A. Incidentally, the region of the fixing tab  120 U 2  is not limited to the region AR 3 , but the fixing tab  120 U 2  may be provided within a region of which angle of circumference about the rotational axis is, for example, 60 degrees, 120 degrees, or 180 degrees. 
     As shown in part (a) of  FIG.  17   , the projected screw portion  120   e  of the cap  120  engages (threadably engages) with the recessed screw portion  103   g  of the pack-side shutter  103 . The cap fixing portion  103   n  includes, as shown in part (a) of  FIG.  10   , a flat surface portion  103   n   1  and two projected portions  103   n   2  and  103   n   3  which project from the flat surface portion  103   n   1  in the mounting direction M along the rotational axis A. The projected portions  103   n   2  and  103   n   3  as second engaging portions are provided side by side with a spacing with respect to the circumferential direction of the phantom circle VC about the rotational axis A. The flat surface portion  103   n   1  extends along a flat surface perpendicular to the rotational axis A. 
     The fixing tab  120 U 2  includes, as shown in part (b) of  FIG.  12   , a flat surface portion  120 U 2  as an adhesive surface extending along a flat surface perpendicular to the rotational axis A and includes two holes  120 U 2   b  and  120 U 2   c  provided in the flat surface portion  120 U 21 . The hole  120 U 2   b  and  120 U 2   c  as first engaging portions extend along the rotational axis A and may be through holes or bottomed holes each provided with a bottom at a lower end portion with respect to the mounting direction M. In the holes  120 U 2   b  and  120 U 2   c , the projected portions  103   n   2  and  103   n   3  of the cap fixing portion  103  and engageable, respectively. Further, the fixing tab  120 U 2  is connected to the cap main body portion  120 U 1  through the connecting portion  120 U 3 , so that the cap  120  is fixed to the pack-side shutter  103  so as not to move relative to the pack-side shutter  103 . A fixing method of the fixing tab  120 U 2  to the cap fixing portion  103   n  will be described later. 
     When the cap  120  is dismounted from the toner pack  100 , as shown in part (b) of  FIG.  17   , the user rotates the cap  120 , mounted on the toner pack  100 , in the arrow L direction. By this, the cap  120  is guided by the recessed screw portion  103   g  and the projected screw portion  120   e , and thus is moved toward a downstream side of the axial direction D 1 , specifically the mounting direction M relative to the portion-to-be-mounted  700 . Incidentally, in the case where the cap  20  is rotated in the arrow K direction opposite to the arrow L direction, the cap  120  abuts against the projected portion  102   b  of the nozzle  102 . 
     Then, when the cap  120  moves toward the downstream side of the mounting direction M, the connecting portion  120 U 3  connecting the fixing tab  120 U 2  and the cap main body portion  120 U 1  is broken. The breakage of the connecting portion  120 U 3  is made in a state in which the fixing tab  120 U 2  is fixed to the cap fixing portion  103   n , whereby the cap main body portion  120 U 1  is separated from the fixing tab  120 U 2 . 
     Then, as shown in part (c) of  FIG.  17   , the cap main body portion  120 U 1  is further rotated in the arrow L direction, and thus engagement between the recessed screw portion  103   g  and the projected screw portion  120   e  is eliminated, so that the cap main body portion  102 U 1  is dismounted from the portion-to-be-mounted  700  of the toner pack  100 . At this time, even when the pack-side shutter  103  is rotated together with the cap  120  in the along L direction friction between the recessed screw portion  103   g  and the projected screw portion  120   e , the rotation restricting rib  103   k  and the rotation restricting surface  102   k  abut against each other (see, part (b) of  FIG.  13   ). By this, the rotation of the pack-side shutter  103  in the arrow L direction is restricted, so that relative to the pack-side shutter  103  at rest, only the cap main body portion  120 U 1  can be rotated in the along L direction. 
     [Mounting of Toner Pack on Mounting Portion] 
     Next, using part (a) of  FIG.  18    to part (b) of  FIG.  20   , a state when the toner pack  100  is mounted on the mounting portion  106  will be described. Part (a) and (b) of  FIG.  18    are perspective views each showing a state in which the toner pack  100  is being mounted onto the mounting portion  106  as viewed in a different angle. Part (a) of  FIG.  19    is a sectional view showing a state in which the toner pack  100  is being mounted onto the mounting portion  106 . Part (b) of  FIG.  19    is a sectional view showing a state in which mounting of the toner pack  100  on the mounting portion  106  is completed. 
     Part (a) of  FIG.  20    is a sectional view showing a  20 A- 20 A cross section of part (a) of  FIG.  19   . Part (b) of  FIG.  20    is a sectional view showing a  20 B- 20 B cross section of part (a) of  FIG.  19   . Incidentally, for ease of view, in part (a) of  FIG.  19    to part (b) of  FIG.  20   , cut surfaces of the pack-side shutter  103  and the cover  110  are hatched. 
     When the toner pack  100  is mounted on the mounting portion  106 , first, the user dismounts the cap main body portion  120 U 1  from the portion-to-be-mounted  700  of the toner pack  100  in the above-described procedure. By this, the portion  103   e  to which drive is transmitted, the projected portion  102   b , and the portion-to-be-positioned  120   d  of the portion-to-be-mounted  700  (see, parts (a) and (b) of  FIG.  10   ) are exposed. The portion-to-be-mounted  700  of the toner pack  100  is mountable on the mounting portion  106  of the image forming apparatus  1  in a state in which the cap main body portion  120 U 1  is dismounted. Incidentally, the cap main body portion  120 U 1  can be mounted again on the portion-to-be-mounted  700  of the toner pack  100 . 
     Then, the user mounts, as shown in parts (a) and (b) of  FIG.  18   , the toner pack  100  onto the mounting portion  106  being in a state in which the apparatus-side shutter  109  is positioned in the shielding position, by moving the toner pack  100 , being in a state in which the pack-side shutter  103  is positioned in the shielding position, in the mounting direction M. At this time, the user positionally aligns the recessed portion  102   e  of the nozzle  102  and the opening  103   a  of the pack-side shutter  103  with the positioning portion  107   a  of the first frame  107 . At the same time, the user also aligns the portion  103   e , to which drive is transmitted, of the pack-side shutter  103  with the drive transmitting portion  108   a  of the operating lever  108 . 
     After such positional alignment of the toner pack  100  with the mounting portion  106 , the user gradually mounts the toner pack  100  onto the mounting portion  106  by moving the toner pack  100  in the mounting direction M. Then, as shown in part (b) of  FIG.  19   , with the inner peripheral surface  102   b   1  of the projected portion  102   b  of the nozzle  102 , a small-diameter portion  109   d   2  of the center boss  109   d  of the apparatus-side shutter is engaged. By this, a position of the nozzle  102  relative to the apparatus-side shutter  109  with respect to the radial direction r is determined. 
     At this time, the drive transmitting portion  109   a  of the operating lever  108  and the portion  103   e  to which drive is transmitted of the pack-side shutter  103  engage with each other as shown in part (a) of  FIG.  20   . At the same time, as shown in part (b) of  FIG.  20   , the side surfaces  110   f  and  110   g  of the cover  110  come close to or engage with the surfaces  102   e   1  and  102   e   2 , respectively, forming the recessed portion  102   e  of the nozzle  102 . Further, as shown in parts (a) and (b) of  FIG.  20   , the portion  103   e , to which the drive is transmitted, of the pack-side shutter  103  engages with the portion  109   b , to which the drive is transmitted, of the apparatus-side shutter  109  and the drive transmitting portion  108   a  of the operating lever  108 . By this, the rotational axis A of the pack-side shutter  103  and the rotational axis B of the apparatus-side shutter  109  are substantially coaxial with each other. 
     Further, the surfaces  102   e   1  and  102   e   2  of the recessed portion  102   e  of the nozzle  102  engage with the surfaces  110   f  and  110   g , respectively, of the cover  110 , so that the nozzle  102  of the toner pack  100  does not rotate relative to the main body base portion  2  including the cover  110 . In other words, when the toner pack  100  is mounted on the image forming apparatus  1 , the recessed portion  102   e  engages with the cover  110 , and thus restricts rotation of the nozzle  102  relative to the image forming apparatus  1 . Then, the operating lever  108 , the pack-side shutter  103 , and the apparatus-side shutter  109  are rotatable relative to the main body base portion  2  and the nozzle  102  substantially integral about the rotational axis B. 
     Specifically, when the operating lever  108  is rotated, the drive transmitting portion  108   a  presses the surface  103   b   1  or  103   b   2  of the pack-side shutter  103 , so that the pack-side shutter  103  is rotated. Thereafter, the surface  103   b   1  or  103   b   2  constituting the portion  103   e  to which drive is transmitted of the pack-side shutter presses the portion  109   e  to which drive is transmitted of the apparatus-side shutter  109 , so that the apparatus-side shutter  109  is rotated. 
     In a state in which the mounting of the toner pack  100  on the mounting portion  106  is completed, the three radial direction positioning portions  103   f  (see, part (b) of  FIG.  8    and parts (a) and (b) of  FIG.  10   ) of the pack-side shutter  103  contact the inner peripheral surface  109   h  (see, part (a) of  FIG.  6   ) of the apparatus-side shutter  109 . By this, a position, with respect to the radial direction r, of the toner pack  100  on an upstream side of the mounting direction M is determined. 
     Further, as shown in part (b) of  FIG.  19   , the projected portion end surface  102   b   2  of the projected portion  102   b  of the nozzle  102  abuts against the pack contact surface  109 , so that a position of the toner pack  100  with respect to the mounting direction M is determined. Incidentally, as regards the positioning of the projected portion  102   b  of the nozzle  102 , a constitution in which the outer peripheral surface of the projected portion  102   b  is engaged with the cylindrical portion  110   j  (see, parts (a) and (b) of  FIG.  7   ) may be employed. 
     Further, the portion-to-be-positioned  102   d  provided on the nozzle  102  engages with the positioning portion  107   a  of the first frame  107 . By this, rotation of the nozzle  102  of the toner pack  100  relative to the first frame  107  (main assembly base portion  2 ) is restricted. 
     Further, as shown in parts (a) and (b) of  FIG.  14   , when the toner pack  100  is mounted on the mounting portion  106 , as described above, the claw portion  102   f  provided on the nozzle  102  is moved from the restricting position to the non-restricting position (position shown in part (b) of  FIG.  14   ). Specifically, the claw portion  102   f  is moved inward from the restricting position toward the non-restricting position with respect to the radial direction r by pressing of the inclined releasing surface  102   f   1  by the restriction releasing rib  109   j . By this, rotation restriction of the pack-side shutter  103  in the arrow K direction is released. 
     [Operation of Operating Lever] 
     Parts (a) of  FIG.  21    is a perspective view showing the operating lever  108  positioned in the closed position and the toner pack  100 . Part (b) of  FIG.  21    is a perspective view showing the operating lever  108  positioned on the open position and the toner pack  100 . Part (a) of  FIG.  22    is a sectional view showing a  22 AB- 22 AB cross section of part (b) of  FIG.  9    when both the apparatus-side shutter  109  and the pack-side shutter  103  are positioned in the shielding positions. Part (b) of  FIG.  22    is a sectional view showing the  22 AB- 22 AB cross section of part (b) of  FIG.  19    when both the apparatus-side shutter  109  and the pack-side shutter  103  are positioned in the open positions. 
     As described above, in the state in which the toner pack  100  is mounted on the mounting portion  106 , the operating lever  108 , the pack-side shutter  103 , and the apparatus-side shutter  109  are integrally rotatable about the rotational axis B relative to the main assembly base portion  2  and the nozzle  102 . In a state in which the toner pack  100  is mounted on the mounting portion  106  and in which the operating lever  108  is positioned in the closed position, as shown in part (a) of  FIG.  22   , the discharging port  102   a  is shielded by the pack-side shutter  103 , the peak-side seal  105 , and the apparatus-side shutter  109 . For this reason, the toner in the pouch  101  is constituted so that the toner cannot reach the apparatus-side opening  117   a  of the second frame  117 . 
     As shown in parts (a) and (b) of  FIG.  21   , when the operating lever  108  is rotated from the closed position to the open position in an arrow Q direction in the state in which the toner pack  100  is mounted on the mounting portion  106 , the pack-side shutter  103  and the apparatus-side shutter  109  are rotated from the shielding positions to the open positions. 
     Specifically, the drive transmitting portion  108   a  presses the surface  103   b   1  of the pack-side shutter  103 . By this, the pack-side shutter  103  is rotated together with the operating lever  108  from the shielding position to the open position. In other words, the pack-side shutter  103  is rotated from the shielding position to the open position in interrelation with the rotation of the operating lever  108  through engagement between the drive transmitting portion  108   a  and the surface  103   b   1 . Further, the surface  103   b  of the pack-side shutter  103  rotated from the shielding position to the open position presses, the portion  109   e , to which the drive is transmitted, of the apparatus-side shutter  109 . By this, the apparatus-side shutter  109  is rotated together with the pack-side shutter  103  from the shielding position to the open position. In other words, the apparatus-side shutter  109  is rotated from the shielding position to the open position in interrelation with the rotation of the operating lever  108  through engagement between the surface  103   b   2  and the portion  109   e  to which drive is transmitted. 
     Then, as shown in part (b) of  FIG.  22   , the discharging port  102   a  of the nozzle  102  is opened by movement of the pack-side shutter  103 , the pack-side seal  105 , and the apparatus-side shutter  109 . That is, the pouch  101  of the toner pack  100  and the toner accommodating portion  36  communicate with each other through the discharging port  102   a , the receiving port  109   a , and the apparatus-side opening  117   a . The toner in the pouch  101  is supplied together with the air to the toner accommodated portion  36  of the developing container  32  through the discharging port  102   a , the receiving port  109   a , and the apparatus-side opening  117   a  by compression of the pouch  101  by the user. 
     The user rotates the operating lever  108  from the open position to the closed position when the supply of the toner from the toner pack  100  to the developing container  32  is completed. When the operating lever  108  is rotated from the open position to the closed position, the drive transmitting portion  108   a  of the operating lever  108  presses the surface  103   b   2  of the pack-side shutter  103 . By this, the pack-side shutter  103  is rotated together with the operating lever  108  from the open position to the shielding position. Further, the portion  103   b   1  of the pack-side shutter  103  rotated from the open position to the shielding position presses, the portion  109   e , to which the drive is transmitted, of the apparatus-side shutter  109 . By this, the apparatus-side shutter  109  is rotated together with the pack-side shutter  103  from the open position to the shielding position. 
     In this state, by pulling-out the toner pack  100  from the mounting portion  106 , a supplying operation of the toner is completed. On the toner pack  100  after the supplying operation is completed, the user may mount the cap main body portion  102 U 1  or may separately dispose of the cap main body portion  120 U 1  and the toner pack  100 . 
     [Detailed Structure of Connecting Portion and Fixing Tab] 
     Next, using  FIG.  23    to part (b) of  FIG.  27   , detailed structures of the connecting portion  120 U 3  and the fixing tab  120 U 2  will be described.  FIG.  23    is a schematic view of the toner pack  100  as viewed in the dismounting direction U. Part (a) of  FIG.  24    is a front view showing the cap  120 . Part (b) of  FIG.  24    is an enlarged view showing a region enclosed by a chain line in part (a) of  FIG.  24   . Part (a) of  FIG.  25    is a sectional view showing a  25 A- 25 A cross section of part (b) of  FIG.  24   . Part (b) of  FIG.  25    is a sectional view showing a  25 B- 25 B cross section of part (b) of  FIG.  24   . Part (c) of  FIG.  25    is a schematic view showing an area of the flat surface portion  120 U 2   a .  FIG.  26    is a schematic view showing a positional relationship between the extended portion  104   b  of the opening member  104  and the fixing tab  120 U 2 . Part (a) of  FIG.  27    is a bottom view of the toner pack  100 , showing a positional relationship between the fixing tab  120 U 2  and the opening  103   a  of the pack-side shutter  103 . Part (b) of  FIG.  27    is a bottom view of a toner pack  100  according to a modified embodiment. 
     As shown in  FIG.  23   , the fixing tab  120 U 2  is disposed in a position spaced from the rotational axis A more than the cap outer surface  120   f  of the cap main body portion U 1  with respect to the radial direction r. Further, the fixing tab  120 U 2  is adhesively bonded and fixed to the cap fixing portion  103   n  provided on the flange portion  103   i  of the pack-side shutter  103 . At this time, in the holes  120 U 2   b  and  120 U 2   c  of the fixing tab  120 U 2 , the projected portions  103   n   2  and  103   n   3  of the cap fixing portion  103   n  and engaged, respectively. Further, the flat surface portion  120 U 2  of the fixing tab  120 U 2  adhesively bonded to the flat surface portion  103   n   1  of the cap fixing portion  103   n . Incidentally, a positional relationship of the holes  102 U 2   b  and  102   u   2   c  with the projected portions  103   n   2  and  103   n   3  may be reversed, and the numbers, sizes, and shapes of these holes and projected portions are not limited to those described above. Here, the fixing tab  120 U 2  may preferably be fixed with strength such that the fixing tab  120 U 2  is not readily peeled off from the cap fixing portion  103   n . Further, the fixing tab  120 U 2  may desirably have fixing strength stronger than the strength of the material of the cap  120 . 
     That is, when the cap main body portion  120 U 1  is dismounted from the toner pack  100 , it is desirable that the cap main body portion  120 U 1  and the fixing tab  120 U 2  are separated from each other earlier than elimination of the fixing between the fixing tab  120 U 2  and the cap fixing portion  103   n . For that reason, in this embodiment, as shown in parts (a) and (b) of  FIG.  24   , the connecting portions  120 U 3  constituted so as to be broken earlier than the elimination of the fixing between the fixing tab  120 U 2  and the cap fixing portion  103   n  are provided. In this embodiment, three connecting portions  120 U 3  are provided, but one connecting portion  120 U 3 , two connecting portions  120 U 3 , or four or more connecting portions  120 U 3  may be provided. 
     The three connecting portions  102 U 3  are constituted substantially in the same shape and are disposed in positions different from each other with respect to the circumferential direction about the rotational axis A. Each of the three connecting portions  120 U 3  is a cylindrical rib which extends along the rotational axis A and which connects the cap main body portion  120 U 1  and the fixing tab  120 U 2 . Further, in a cross section perpendicular to the rotational axis A, a cross-sectional area of each of the connecting portions  120 U 3  is made smaller than a cross-sectional area of the fixing tab  120 U 2 . Incidentally, a total cross-sectional area of the three connecting portions  120 U 3  is also made smaller than the cross-sectional area of the fixing tab  120 U 2 . In part (c) of  FIG.  25   , an area S 3  of the flat surface portion  120 U 2   a  which does not include the holes  120 U 2   b  and  120 U 2   c  corresponds to the cross-sectional area of the fixing tab  120 U 2 . This area S 3  is larger than a first area S 1  and a second area S 2  which are described later. 
     Further, each of the connecting portions  120 U 3  has a shape such that the cross-sectional area thereof is not uniform between the cap main body portion  120 U 1  and the fixing tab  120 U 2  and changes intermittently. For example, as shown in part (b) of  FIG.  24    and parts (a) and (b) of  FIG.  25   , the cross-sectional area of the connecting portion  120 U 3  in the  25 A- 25 A cross section as a first cross section is referred to as the first area S 1 . Further, the cross-sectional area of the connecting portion  120 U 3  in the  25 B- 25 B as a second cross section is referred to as the second area S 2 . In this case, the second area S 2  is smaller than the first area S 1 . Incidentally, in the axial direction D 1  of the rotational axis A, a part of the connecting portion  120 U 3  having the first area S 1  is longer than a part of the connecting portion  120 U 3  having the second area S 2 . The  25 A- 25 A cross section and the  25 B- 25 B cross section are perpendicular to the rotational axis A. The  25 B- 25 B cross section is positioned in a position different from the position of the  25 A- 25 A cross section, and specifically is positioned in the position closer to the cap main body portion  120 U 1  than the  25 A- 25 A cross section is. Thus, the cross section of the connecting portion  120 U 3  in this embodiment is large on a side close to the fixing tab  120 U 2  and is small on a side close to the cap main body portion  120 U 1 . 
     Further, the connecting portion  120 U 3  includes an upstream corner portion T 1  and a downstream corner portion T 2  with respect to the arrow L direction in an end portion on a side where the connecting portion  120 U 3  is connected to the fixing tab  120 U 2 . The corner portion T 1  is smoothly connected to the fixing tab  120 U 2  at curvature smaller than curvature of the corner portion T 2 . That is, the corner portion T 1  is connected to the fixing tab  120 U 2  in an area larger than the corner portion T 2  is. 
     Thus, the cross-sectional area of the connecting portion  120 U 3  becomes small on the side close to the cap main body portion  120 U 1 , and therefore, the connecting portion  120  U 3  is easily broken on the side closer to the cap main body portion  120 U 1 . Further, the corner portion T 1  is formed at the curvature smaller than the curvature of the corner portion T 2 , and therefore, when the cap main body portion  120 U 1  is rotated in the arrow L direction, the corner portion T 2  is bent easier than the corner portion T 1 , and the corner portion T 1  is stronger in bending stress than the corner portion T 2 . For this reason, a part of the connecting portion  120 U 3  close to the cap main body portion  120 U 1  is broken before a part of the connecting portion  120 U 3  which includes the corner portions T 1  and T 2  connected to the fixing tab  120 U 2  and which is close to the fixing tab  120 U 2 . For this reason, a residue of the connecting portion  120 U 3  remaining on the cap main body portion  120 U 1  side after the breaking can be made small in amount, so that when the user takes charge of the removed cap main body portion  120 U 1 , the residue is not readily caught, and thus usability can be improved. 
     Incidentally, in this embodiment, a constitution in which the cross-sectional area of the connecting portion  120 U 3  is made large on the side close to the fixing tab  120 U 2  and is made small on the side close to the cap main body portion  120 U 1  was employed, but the present invention is not limited thereto. The connecting portion  120 U 3  may preferably be provided with a part, at any place between the cap main body portion  120 U 1  and the fixing tab  120 U 2 , where the cross-sectional area thereof is small so as to be easily broken. 
     Further, in this embodiment, as materials of the cap  120  and the pack-side shutter  103 , a polypropylene resin material is used. The fixing tab  120 U 2  and the cap fixing portion  103   n  are adhesively bonded to each other in such a manner that a primer principally comprising hexane and an amine compound is applied onto their flat surface portions  120 U 2   a  and the  103   n   1  and then an instant adhesive of a cyanoacrylate type is applied onto the flat surface portions. Adhesive strength between the fixing tab  120 U 2  and the cap fixing portion  103   n  bonded to each other in such a manner is higher than strength of the connecting portion  120 U 3 . Thus, the flat surface portions  120 U 2   a  and  103   n   1  are adhesively bonded to each other, and therefore, movement of the fixing tab  120 U 2  relative to the pack-side shutter  103  in the axial direction D 1  of the rotational axis A is restricted. Further, in the holes  120 U 2   b  and  120 U 2   c , the projected portions  103   n   2  and  103   n   3  are engaged, respectively, and therefore, movement of the fixing tab  120 U 2  relative to the pack-side shutter  103  in the rotational direction of the cap main body portion  120 U 1  is restricted. That is, the fixing tab  120 U 2  is fixed to the portion-to-be-mounted  700  so as to restrict the movement of the cap main body portion  120 U 1  relative to the portion-to-be-mounted  700  including the pack-side shutter  103  in both of the axial direction D 1  and the rotational direction of the cap main body portion  120 U 1 . 
     For this reason, when the cap main body portion  120 U 1  of the cap  120  is dismounted from the toner pack  100 , the connecting portions  120 U 3  are broken without eliminating the adhesive bonding between the fixing tab  120 U 2  and the cap fixing portion  103   n . By this, the cap main body portion  120 U 1  is separated from the fixing tab  120 U 2 , so that the cap main body portion  120 U 1  can be dismounted from the toner pack  100 . 
     Thus, the cap  120  of which connecting portions  120 U 3  are broken can be discriminated from an outer appearance thereof as that the cap  120  has already been used (up), so that it is possible to reduce an opportunity to supply the toner with use of the toner pack  100  used up. By this, toner supply efficiency can be improved. 
     Next, using  FIG.  26   , a positional relationship between the extended portion  140   b  of the opening member  104  and the fixing tab  120 U 2  will be described.  FIG.  26    is a schematic view of the toner pack  100  and the cap  120  as viewed in the dismounting direction U (the axial direction D 1 ). In  FIG.  26   , an outer configuration of the opening member  104  is indicated by a broken line. 
     As shown in  FIG.  26   , in the case where the fixing tab  120 U 2  is viewed in the axial direction D 1 , at least a part thereof is disposed so as to overlap with the extended portion  104   b  of the opening member  104 . The extended portion  104   b  is projected outward in the radial direction r than the cap outer surface  120   f  is. 
     When the cap main body portion  120 U 1  is dismounted from the toner pack  100 , the user applies a force, for rotating the cap main body portion  120 U 1 , to the cap main body portion  120  U 1 . At this time, the user is easy to exert the force on the cap main body portion  120 U 1  by gripping the extended portion  104   b  with user&#39;s hand opposite to the other hand used for rotating the cap main body portion  120 U 1 . That is, the extended portion  104   b  functions as a non-slip portion so that the user&#39;s hand does not slip with respect to the rotational direction about the rotational axis A, so that an operating property can be improved. 
     The extended portion  104   b  and the fixing tab  120 U 2  fixing the cap  120  to the toner pack  100  with respect to the rotational direction are disposed in positions which overlap with each other as viewed in the axial direction D 1 , and therefore, the user can easily observe states of the fixing tab  120 U 2  and the connecting portion  120 U 3 . For this reason, the user is capable of easily discriminating whether the toner pack  100  is not used or used (up), so that usability can be improved. 
     Next, using part (a) of  FIG.  10   ,  FIG.  26   , and part (a) of  FIG.  27   , a positional relationship between the fixing tab  120 U 2  and the opening  103   a  of the pack-side shutter  103  will be described. Parts (a) and (b) of  FIG.  27    are schematic views of the toner pack  100  as viewed in the dismounting direction U (see, part (b) of  FIG.  15   ) along the rotational axis A. 
     As shown in part (a) of  FIG.  10    and part (a) of  FIG.  27   , the fixing tab  120 U 2  and the cap fixing portion  103   n  are provided in the same phase as the phase of the opening  103   a  with respect to the circumferential direction of the phantom circle VC about the rotational axis A. The cap fixing portion  103   n  may be provided in another place of the flange portion  103   i , but in the position in this embodiment where the cap fixing portion  103   n  is provided in the same phase as the phase of the opening  103   a , the cap fixing portion  103   n  can be easily disposed, so that the pack-side shutter  103  can be easily manufactured. Further, as in the modified embodiment shown in part (b) of  FIG.  27   , the fixing tab  120 U 2  and the cap fixing portion  103   n  may also be provided in the same phase as a phase of the portion  103   e  to which drive is transmitted, formed in the recessed shape. 
     Further, as shown in part (a) of  FIG.  10    and part (a) of  FIG.  27   , with respect to the circumferential direction of a phantom circle about the rotational axis A as viewed in the direction (the axial direction D 1 ) of the rotational axis A, a rectilinear line passing through one-side edge  103   a   1  of the opening  103   a  and the rotational axis A is referred to as a first rectilinear line W 1 . Further, a rectilinear line passing through the other-side edge  103   a   2  of the opening  103   a  and the rotational axis A is referred to as a second rectilinear line W 2 . At this time, as viewed in the direction (the axial direction D 1 ) of the rotational axis A, the fixing tab  120 U 2  and the cap fixing portion  103   n  are disposed in a region AR 1 , containing the opening  103   a , between the first rectilinear line W 1  and the second rectilinear line W 2 . Incidentally, the edges  103   a   1  and  103   a   2  through which the first rectilinear line W 1  and the second rectilinear line W 2  pass, respectively, are connecting portions to the flange portion  103   i , and are positioned at an upstream end portion of the side surface  103   d  of the pack-side shutter  103  with respect to the mounting direction M. In the case of a modified embodiment shown in part (b) of  FIG.  27   , as viewed in the direction of the rotational axis A, the fixing tab  120 U 2  and the cap fixing portion  103   n  are disposed in a region AR 2 , opposite from the region arrow  1  containing the opening  103   a , between the first rectilinear line W 1  and the second rectilinear line W 2 . 
     As described above, when the cap  120  is dismounted from the toner pack  100 , the cap main body portion  120 U 1  is separated from the fixing tab  120 U 2 , and thus the user easily discriminates whether the toner pack is not used or used (up), so that the usability can be improved. Further, the cap  120  is mounted on the portion-to-be-mounted  700  of the toner pack  100 , so that the portion-to-be-mounted  700  can be protected. Particularly, the cap  120  is capable of protecting the portion  103   e , to which drive is transmitted, of the portion-to-be-mounted  700 , the projected portion  120   b , and the portion-to-be-positioned  102   d . The portion  103   e  to which drive is transmitted, the projected portion  102   b , and the portion-to-be-positioned  120   d  are used for positioning of the toner pack  100  (the nozzle  102 ) relative to the mounting portion  106  and for the rotational operation of the pack-side shutter  103  by the operating lever  108 . For this reason, the portion  103   e  to which drive is transmitted, the projected portion  102   b , and the portion-to-be-positioned  102   d  are prevented from being broken by an external shock (impact), or the like before the toner supply, so that the toner supply from the toner pack  100  toward the developing container  32  can be appropriately performed. 
     [Details of Flange Portion] 
     Next, using part (a) of  FIG.  28    to  FIG.  31   , the flange portion  103   i  of the toner pack  103  will be specifically described. Part (a) of  FIG.  28    is a perspective view showing the toner pack  100 , and part (b) of  FIG.  28    is a schematic view showing a state in which the toner pack  100  is viewed in the mounting direction M of the axial direction D 1 . 
     Part (a) of  FIG.  29    is a perspective view showing the accommodating container  800  in a state in which the accommodating container  800  is packed in a packing box  500 , and part (b) of  FIG.  29    is a perspective view showing the packing box  500  in an open state and the accommodating container  800 .  FIG.  30    is a front view showing the accommodating container  800  in the state in which the accommodating container  800  is packed in the packing box  500 .  FIG.  31    is a perspective view showing the toner pack  100  in a state in which the cap  120  is mounted on the toner pack  100 . 
     As shown in parts (a) and (b) of  FIG.  28   , the pack-side shutter  103  of the toner pack  100  includes the flange portion  103   i . The flange portion  103   i  extends in the radial direction r (see part (b) of  FIG.  8   ) crossing the rotational axis direction A extending along the mounting direction M of the toner pack  100 . The flange portion  103   i  constitutes an outermost configuration of the pack-side shutter, i.e., an outer configuration remotest from the rotational axis A as viewed in the mounting direction. 
     An outer edge  103   p  of the flange portion  103   i  includes the arcuate portion  103   q  and a rectilinear portion  103   r , and the arcuate portion  103   q  is formed along a phantom circle  103   s  about the rotational axis A as viewed in the mounting direction as shown in part (b) of  FIG.  28   . Further, the arcuate portion  103   q  is a remotest portion of the pack-side shutter  103  from the rotational axis A. In other words, as viewed in the axial direction D 1 , of the portion-to-be-mounted  700  (see part (b) of  FIG.  8   ), the arcuate portion  103   q  is positioned on an outermost side from the rotational axis A in the radial direction r. The rectilinear portion  103   r  as a connecting portion is provided in a region inside the phantom circle  103   s  and connects a first end P 1  (first point) of the arcuate portion  103   q  and a second end P 2  (second point) of the arcuate portion  103   q  different from the first end P 1  with respect to the circumferential direction of the phantom circle  103   s . In this embodiment, the rectilinear portion  103   r  is formed in a straight line shape along a phantom rectilinear line SL 1  passing through the first end P 1  and the second end P 2 . 
     Further, as viewed in the axial direction D 1 , the pouch  101  has a flat shape such that a length thereof in a longitudinal direction LD as a first direction is longer than a length thereof in a short-side direction SD as a second direction. The rectilinear portion  103   r  extends along the longitudinal direction LD of the pouch  101  as viewed in the axial direction D 1  including the mounting direction M. Further, as viewed in the axial direction D 1  including the mounting direction M, at least a part of the arcuate portion  103   q  is in a position remoter, with respect to the short-side direction SD perpendicular to the longitudinal direction LD of the pouch  101 , from the outer edge  101   f  of the pouch  101  is. Further, as shown in part (a) of  FIG.  27   , as viewed in the axial direction D 1 , the outer edge  103   p  of the flange portion  103   i  is in a position remoter from the rotational axis A than an outer edge of the cap  120 , i.e., an outer edge  120 U 1   a  of the cap main body portion  120 U 1  is. 
     In this embodiment, a distance La between the first end P 1  and the second end P 2 , i.e., a length of the rectilinear portion  103   r  is set so as to not less than ⅕ of a diameter φD of the arcuate portion  103   q  of the flange portion  103   i  and less than the diameter φD. Preferably, the distance La is not less than 1.5 of the diameter φD and not more than 4.5 of the diameter φD. 
     As shown in part (a) of  FIG.  29   , the accommodating container  800  including the toner pack  100  and the cap  120  is packed in the packing box  500  and then is transported. The packing box  500  is formed in a substantially rectangular-shaped box form and includes a main body portion  500   x  and a lid portion  500   y  openable and closable relative to the main body portion  500   x . The accommodating container  800  is accommodated in the main body portion  500   x  and can be taken out from the main body portion  500   x  by connecting the lid portion  500   y . The main body portion  500   x  is constituted by fine surfaces including one surface  500   x   1  opposing the rectilinear portion  103   r  of the flange portion  103   i  and a first swelling portion  101   d  of the pouch  101 . 
     Here, the pouch  101  as a bag of the toner pack  100  is, as described above, formed by subjecting, for example, a flexible polyethylene sheet to pouch processing. That is, the pouch  101  is a bag prepared by bonding two sheets together at a first bonding portion  101   b  and a second bonding portion  101   c  provided on a side opposite from the first bonding portion  101   b  with respect to the rotational axis A with respect to the longitudinal direction LD as shown in part (b) of  FIG.  28   . As shown in parts (a) and (b) of  FIG.  28   , as viewed in the mounting direction M, the pouch  101  includes the first swelling portion and a second swelling portion which are formed between the first bonding portion  101   b  and the second bonding portion  101   c  and which are swelled in the short-side direction SD so as to be spaced from the rotational axis A. The second swelling portion is swelled toward a side opposite from the first swelling portion  101   d  side. As viewed in the mounting direction M, each of the first bonding portion  101   b  and the second bonding portion  101   c  is disposed outside the phantom circle  103   s . As viewed in the mounting direction M, each of the first swelling portion  101   d  and the second swelling portion  101   e  is disposed inside the phantom circle  103   s.    
     When the pack-side shutter  103  is positioned in the shielding position, as viewed in the mounting direction M, the rectilinear portion  103   r  is positioned in a region, of two regions divided by a phantom rectilinear line SL 2  passing through the first bonding portion  101   b  and the second bonding portion  101   c , where the first bonding portion  101   d  is disposed (see part (b) of  FIG.  28   ). Incidentally, in a state in which the accommodating container  800  is packed in the packing box  500 , the pack-side shutter  103  is positioned in the shielding position. 
     The packing box  500  has a height h 1  as viewed in the mounting direction M when the surface  500   x   1  is a bottom (surface). Further, the accommodating container  800  has a height h 2  in an attitude in which the rectilinear portion  103   r  and the first swelling portion  101   d  are supported by the surface  500   x   1 . 
     The height h 2  is a distance from the rectilinear portion  103   r  to a position of the arcuate portion  103   q  remotest from the rectilinear portion  103   r  of the flange portion  103   i  forming the outermost configuration of the accommodating container  800 . The height h 1  is set so as to slightly larger than the height h 2 , so that the flange portion  103   i  can be downsized by a height h 3  when compared with the case where the outer edge  103   p  of the flange portion  103   i  is formed along a full circumference of the phantom circle  103   s . For this reason, the packing box  500  for packing the accommodating container  800  can also be downsized, so that transportation efficiency can be improved. 
     Further, by forming the rectilinear portion  103   r  as a part of the center  103   p  of the flange portion  103   i , the accommodating container  800  can be supported in the packing box  500  by the rectilinear portion  103   r  and the first swelling portion  101   d . In other words, the accommodating container  800  is constituted so that in the case where the accommodating container  800  is placed on the surface  500   x   1  perpendicular to a direction of gravitation G 1 , the first swelling portion  101   d  and the rectilinear portion  103   r  contact the surface  500   x   1 . The rectilinear portion  103   r  line-contacts the surface  500   x   1 , and therefore, a change in attitude of the accommodating container  800  packed in the packing box  500  can be suppressed. 
     Further, when the accommodating container  800  is packed in the packing box  500  in the attitude as described above, as shown in parts (a) and (b) of  FIG.  29   , the first bonding portion  101   b  opposes the lid portion  500   y . For this reason, when the user opens the lid portion  500   y  in an arrow E direction, the user is capable of easily taking out the accommodating container  800  from the packing box  500  by gripping the first bonding portion  101   b , so that a taking-out property of the accommodating container  800  can be improved. 
     Incidentally, the rectilinear portion  103   r  may desirably be constituted so as to be made as long as possible in order to stabilize the attitude of the accommodating container  800  in the packing box  500  and downsize the packing box  500 . That is, the distance La which is the length of the rectilinear portion  103   r  may preferably be set so as to be as long as possible within the above-described condition. 
     As shown in  FIG.  31   , the cap  102  mounted on the toner pack  100  can be rotated in the arrow K direction and the arrow L direction. As described above, the cap  120  can be dismounted (removed) from the pack-side shutter  103  by being rotated in the arrow L direction and abuts against the projected portion  102   b  of the nozzle  102  by being rotated in the arrow K direction (see parts (a) to (c) of  FIG.  17   ). 
     When the cap  120  is rotated, the user is required that the user supports a portion of the accommodating container  800  other than the cap  120  by his (her) hand and receives a rotational force of the cap  120 . The pouch  101  is constituted by the flexible polypropylene sheet as described above, and therefore is not appropriate for receiving the rotational force, so that it is desirable that the user grips the flange portion  103   i  of the pack-side shutter  103  harder than the pouch  101 . In this embodiment, the flange portion  103   i  is provided with the rectilinear portion  103   r , so that the user is capable of easily supporting the rotational force acting on the cap  120  by hooking his (her) fingers on the rectilinear portion  103   r  than in the case where the full circumference of the outer edge  103   p  of the flange portion  103   i  has an arcuate shape. By this, an operating property when the cap  120  is rotated can be improved. Incidentally, the user may grip not only the rectilinear portion  102   r  of the flange portion  103   i  but also, for example, the extended portion  104   b  of the opening member  104  (see  FIG.  26   ). 
     Part (a) of  FIG.  32    is a perspective view showing the mounting portion  106  and the toner pack  100 , and part (b) of  FIG.  32    is a perspective view showing a state in which the toner pack  100  is mounted on the mounting portion  106 . As shown in part (a) of  FIG.  32   , the operating lever  108  of the mounting portion  106  is provided with a recessed portion  108   i  formed along the outer configuration of the flange portion  103   i . The recessed portion  108   i  is formed lower by one stage when another portion so that the flange portion  103   i  of the toner pack  100  can engage with the recessed portion  108   i.    
     An outer edge  108   p  of the recessed portion  108   i  includes an arcuate portion  108   q  as a first opposing portion and a rectilinear portion  108   r  as a second opposing portion, and the arcuate portion  108   q  is formed along a phantom circle  108   s  about a rotational axis B. The rectilinear portion  108   r  is formed in a straight line shape inside the phantom circle  108   s . Thus, the outer edge  108   p  of the recessed portion  108   i  formed as a part of the operating lever  108  has a shape similar to the shape of the outer edge  103   p  of the flange portion  103   i  of the toner pack  100 . For this reason, when the user inserts the toner pack  100  into the mounting portion  106 , the user is capable of visually align the toner pack  100  with the recessed portion  108   i , so that usability can be improved. Further, mounting of the toner pack in the mounting portion  106  in an erroneous attitude is suppressed, so that leakage of the toner or the like can be reduced. 
     As shown in part (b) of  FIG.  32   , the mounting portion  106  is constituted so that the pouch  101  and the flange portion  103   i  are exposed to an outside when the toner pack  100  is mounted on the mounting portion  106  by moving the toner pack  100  in a direction along the rotational axis A and approaching the mounting portion  106 . At this time, the arcuate portion  108   q  and the rectilinear portion  108   r  of the recessed portion  108   i  oppose the arcuate portion  103   q  and the rectilinear portion  103   r  of the flange portion  103   i , respectively, in the radial direction r (see part (a) of  FIG.  3   ). By this, the user is capable of visually recognize that the toner pack  100  is properly mounted on the mounting portion  106 . On the other hand, the case where when the attitude of the toner pack  100  shown in part (b) of  FIG.  32    is a first attitude, the toner pack  100  rotated about the rotational axis A from the first attitude by 180 degrees is mounted on the mounting portion  106  would be considered. In this case, the flange portion  103   i  cannot be mounted on the recessed portion  108   i , so that the arcuate portion  108   q  and the rectilinear portion  108   r  or the rectilinear portion  108   i  do not oppose the arcuate portion  103   q  and the rectilinear portion  103   r  of the flange portion  103   i , respectively, in the radial direction r (see part (a) of  FIG.  3   ). That is, the arcuate portion  103   q  of the flange portion  103   i  interferes with the rectilinear portion  108   r  of the mounting portion  106 , so that the toner pack  100  cannot be completely mounted on the mounting portion  106 . For this reason, the user is capable of visually recognizing that the toner pack  100  is not properly mounted on the mounting portion  106 . 
     Incidentally, in the state in which the toner pack  100  is mounted on the mounting portion  106 , as shown in part (b) of  FIG.  19   , the projected portion end surface  102   b   2  of the nozzle  102  abuts against the pack contact surface  109   g  of the apparatus-side shutter  109 , so that a position of the toner pack  100  with respect to the mounting direction M is determined. For this reason, there is a slight gap between the flange portion  103   i  and an upper surface of the recessed portion  108 . However, for example, in the case where the toner pack  100  is not sufficiently inserted into the mounting portion  106 , between the flange portion  103   i  and the upper surface of the recessed portion  108   i , a large gap is formed, so that the flange portion  103   i  and the recessed portion  108   i  are largely spaced from each other. 
     For this reason, when the toner pack  100  is mounted on the mounting portion  106 , the second swelling portion  101   e  of the pouch  101  faces the user. On the second swelling portion  101   e , an image  101   g  showing a manner of supplying the toner accommodated in the toner pack  100  is printed, and therefore, viewability of the image  101   g  can be improved. The user can supply the toner while looking at the toner supply manner shown as the image  101   g , so that usability can be improved. 
     Further, as shown in parts (a) and (b) of  FIG.  1    and parts (a) and (b) of  FIG.  32   , when the toner pack  100  is mounted on the mounting portion  106 , the rectilinear portion  103   r  is disposed on a side opposite from a side facing the operating portion  300  with respect to the arcuate portion  103   q . That is, when the user faces the operating portion  300 , the rectilinear portion  103   r  is disposed on the rear side than the arcuate portion  103   q  is. Further, when the toner pack  100  is mounted on the mounting portion  106 , the rectilinear portion  103   r  is disposed upstream of the arcuate portion  103   q  with respect to the sheet discharging direction DD by the discharging roller pair  80 . 
     Part (a) of  FIG.  33    is a schematic view showing the flange portion  103   i  in this embodiment as viewed in the mounting direction M. Part (b) of  FIG.  33    is a schematic view showing a flange portion  1103   i  in a first modified embodiment as viewed in the mounting direction M. Part (c) of  FIG.  33    is a schematic view showing a flange portion  2103   i  in a second modified embodiment as viewed in the mounting direction M. In this embodiment, as shown in part (a) of  FIG.  33   , the flange portion  103   i  having a shape such that the flange portion  103   i  is chamfered by the rectilinear portion  103   r  is used, but the present invention is not limited thereto. 
     For example, as shown in part (b) of  FIG.  33   , instead of the flange portion  103   i , the flange portion  1103   i  in the first modified embodiment may be applied. An outer edge  1103   p  of the flange portion  1103   i  includes a first arcuate portion  103   q   1 , a second arcuate portion  103   q   2 , a first rectilinear portion  103   r   1  as a first connecting portion, and a second rectilinear portion  103   r   2  as a second connecting portion. 
     The first arcuate portion  103   q   1  extends arcuately along the phantom circle  103   s  between the first end P 1  and a third end P 3  (third point) different from the first end P 1  and the second end P 2 . The second arcuate portion  103   q   2  extends arcuately along the phantom circle  103   s  between the second end P 2  and a fourth end P 4  (fourth point) different from the second end P 2  and the third end P 3 . The first rectilinear portion  103   r   1  is formed inside the phantom circle  103   s  similarly as in this embodiment shown in part (a) of  FIG.  33    and is formed linearly so as to connect the first end P 1  and the second end P 2 . The second rectilinear portion  103   r   2  is formed inside the phantom circle  103   s  and is formed linearly so as to connect the third end P 3  and the fourth end P 4 . 
     That is, the flange portion  1103   i  in the first modified embodiment has a shape such that the flange portion is chamfered by the first rectilinear portion  103   r   1  and the second rectilinear portion  103   r   2  to form two rectilinear surface. For this reason, compared with the flange portion  103   i  in this embodiment, the height of the flange portion  1103   i  is a further suppressed height, so that the packing box  500  is downsized and thus transportation efficiency can be improved. 
     Further, for example, as shown in part (c) of  FIG.  33   , instead of the flange portion  103   i , the flange portion  2103   i  in the second modified embodiment may be applied. An outer edge  2103   p  of the flange portion  2103   i  includes the arcuate portion  103   q  and a connecting portion  2103   r  formed inside the phantom circle  103   s . The connecting portion  2103   r  includes a plurality of projections and recesses by a plurality of rectilinear portions. Further, in addition to the first end P 1  and the second end P 2 , the connecting portion  2103   r  includes a plurality (two in the second modified embodiment) of apexes  2103   r   1  and  2103   r   2  formed on the phantom rectilinear line SL 1 . 
     The connecting portion  2103   r  contacts the surface  500   x   1  of the packing box  500  at a plurality of points, i.e., the first end P 1 , the second end P 2 , and the apexes  2103   r  and  2103   r   2 , and therefore, a change in attitude of the toner pack  100  packed in the packing box  500  can be suppressed. Incidentally, in the second modified embodiment, the connecting portion  2103   r  is constituted by the plurality of the rectilinear portions, but the present invention is not limited thereto. The center portion  2103   r  may include, in addition to the first end P 1  and the second end P 2 , one or three or more apexes on the phantom rectilinear line SL 1  and may have any shape when the connecting portion  2103   r  is formed inside the phantom circle SL 1  as viewed in the mounting direction M. For example, the connecting portion  2103   r  may only be required to be provided on the phantom rectilinear line SL 1  or in a region on a side where the rotational axis A is disposed with respect to the phantom rectilinear line SL 1 . 
     As described above, according to this embodiment, it is possible to provide a form of the accommodating container  800  mountable in the image forming apparatus  1 . Especially, the flange portion  103   i  is provided with the rectilinear portion  103   r , so that not only the change in attitude of the toner pack can be suppressed, but also the transportation efficiency can be improved by downsizing the packing box  500 . Further, not only the taking-out property of the accommodating container  800  can be improved, but also the operating property when the cap  120  is rotated can be improved. 
     OTHER EMBODIMENTS 
     Incidentally, in this embodiment, the arcuate portion  103   q  of the flange portion  103   i  was formed along the phantom circle  103   s  about the rotational axis A, but the present invention is not limited thereto. For example, although the arcuate portion  103   q  extends along the phantom circle  103   s , the arcuate portion  103   q  may also be formed by being somewhat deviated from the phantom circle  103   s . For example, the arcuate portion  103   q  may also be formed along an ellipse or a cycloid curve. 
     Further, in this embodiment, the flange portion  103   i  is formed integrally with the pack-side shutter  103 , but the present invention is not limited thereto. For example, the flange portion  103   i  may be formed integrally with the nozzle  102  or the opening member  104 . 
     Further, in the embodiment described above, the cap  120  is mounted on the pack-side shutter  103 , but the present invention is not limited thereto. For example, the cap  120  may be mounted on the nozzle  102 . Further, if the cap is capable of protecting the portion-to-be-mounted of the toner pack, the cap may also be mounted on any member of the toner pack without limiting the portion-to-be-mounted to the nozzle or the pack-side shutter. 
     Further, in the above-described embodiment, the fixing tab  120 U 2  and the cap fixing portion  103   n  are bonded by the primer and the adhesive, but the present invention is not limited thereto. For example, the fixing tab  120 U 2  and the cap fixing portion  103   n  may be fixed by (thermal) welding, a double-side tape, or the like. Further, materials of the cap  120  and the portion-to-be-mounted  700  and a shape of the connecting portion  120 U 3  may be changed arbitrarily. 
     Further, in the above-described embodiment, the toner is applied in the pouch  101  of the toner pack  100 , but the present invention is not limited thereto. For example, as the content accommodated in the pouch  101 , other than the toner, ink may be used, and powder or a liquid is capable of being accommodated in the pouch  101 . Further, the powder accommodatable in the pouch  101  is not limited to the toner. In the case where the ink is accommodated in the pouch  101 , the toner pack  100  may be mounted on an image forming apparatus of an ink jet type. 
     Further, in the above-described embodiment, the pack-side shutter  103  and the apparatus-side shutter  109  are constituted so as to be rotatable about the rotational axes A and B between the shielding position and the open position, but the present invention is not limited thereto. For example, the pack-side shutter  103  and the apparatus-side shutter  109  may be constituted so as to be movable between the open position by being linearly moved parallel to the mounting direction M. 
     Further, in the above-described embodiment, the pack-side shutter  103  is constituted so as to open the discharging port  102   a  of the nozzle  102  only in the open position, but the present invention is not limited thereto. For example, the pack-side shutter  103  may be a rotatable member which opens the discharging port  102   a  of the nozzle  102  irrespective of a rotation position. At that time, the discharging port  102   a  of the nozzle  102  may employ a constitution in which the discharging port  102   a  is closed by a seal when the toner pack  100  is not yet mounted on the mounting portion  106  and then the seal is removed by a mounting operation onto the mounting portion  106  or after the mounting. Further, a constitution in which the pack-side shutter  103  of the toner pack  100  is omitted may be employed. 
     Further, in the above-described embodiment, the pack-side shutter  103  is provided with the recessed screw portion  103   g  which is a female screw, and the cap  120  is provided with the projected screw portion  120   e  which is a male screw, but the present invention is not limited thereto. For example, the pack-side shutter  103  may be provided with the male screw, and the cap  120  may be provided with the female screw. 
     Incidentally, in the above-described embodiment, the cap main body portion  120 U 1  and the fixing tab  120 U 2  were connected by the connecting portions  120 U 3 , but the present invention is not limited thereto. For example, the fixing tab  120 U 2  may be directly fixed to the cap main body portion  120 U 1  by bonding, snap-fitting, a magnet, or the like. In this case, it is preferable that fixing strength of the cap main body portion  120 U 1  and the fixing tab  120 U 2  is set so as to be weaker than above-described strength of the fixing tab  120 U 2  and the cap fixing portion  103   n.    
     Finally, the typical structures disclosed in the present application was summarized in the following. In the following, the elements may be accompanied by reference numerals and/or characters signed to indicate the correspondence with the above-described embodiments. However, this correspondence is just an example for reference, and the elements in the following structure are not limited to the corresponding elements with the reference numerals and/or characters in the above-described embodiments. 
     Structure Example 1 
     A container for accommodating a content of powder or a liquid, comprising: 
     an accommodating portion configured to accommodate the content; 
     an end portion including a rotatable member configured to rotate about a rotational axis and a discharging portion which includes a discharge opening for permitting discharge of the content to an outside of the container and which includes a passage for permitting passing of the content toward the discharge opening, wherein the end portion is on a side opposite from the accommodating portion with respect to a rotational axis direction; and 
     a flange portion extending in a radial direction of a phantom circle about the rotational axis, wherein an outer edge of the flange portion includes an arcuate portion which is on an outermost side of the end portion with respect to the radial direction and which is formed along the phantom circle about the rotational axis and includes a connecting portion which connects a first point and a second point on the phantom circle and which is provided in a region inside the phantom circle. 
     Structure Example 2 
     The container according to Structure Example 1, wherein as viewed in the rotational axis direction, the connecting portion is formed along a phantom rectilinear line passing the first point and the second point. 
     Structure Example 3 
     The container according to Structure Example 1, wherein as viewed in the rotational axis direction, the connecting portion is provided on the phantom rectilinear line passing through the first point and the second point or in a region on a side where the phantom rectilinear line is positioned relative to the phantom rectilinear line. 
     Structure Example 4 
     The container according to any one of Structure Examples 1 to 3, wherein a distance between the first point and the second point is not less than ⅕ of a diameter of the arcuate portion of the flange portion and is less than the diameter of the arcuate portion of the flange portion. 
     Structure Example 5 
     The container according to any one of Structure Examples 1 to 4, wherein the rotatable member has an outer peripheral surface which is rotatable about the rotational axis relative to the discharge opening between a closed position where the discharge opening is closed and an open position where the discharger opening is open and which extend along the rotational axis and covers a part of the discharge portion, and 
     wherein the flange portion is provided as a part of the rotatable member and extends toward an outside in the radial direction than the outer peripheral surface does. 
     Structure Example 6 
     The container according to any one of Structure Examples 1 to 5, wherein as viewed in the rotational axis direction, the accommodating portion has a width wider in a first direction than in a second direction perpendicular to the first direction, and 
     wherein as viewed in the rotational axis direction, the first point and the second point are arranged in the first direction. 
     Structure Example 7 
     The container according to Structure Example 6, wherein as viewed in the rotational axis direction, at least a part of the arcuate portion is in a position spaced with respect to the second direction from the rotational axis than an outer edge of the accommodating portion is. 
     Structure Example 8 
     The container according to Structure Example 7, wherein the accommodating portion is a bag including two sheets which are bonded, as viewed in the rotational axis direction, to a first bonding portion and a second bonding portion provided on a side opposite from the first bonding portion with respect to the rotational axis, the first bonding portion and the second bonding portion being disposed outside the phantom circle as viewed in the rotational axis direction, 
     wherein as viewed in the rotational axis direction, the accommodating portion includes a first swelling portion and a second swelling portion which are swelled so as to be separated from each other with respect to the second direction between the first bonding portion and the second bonding portion as viewed in the rotational axis direction, the first swelling portion and the second swelling portion being disposed inside the phantom circle as viewed in the rotational axis direction. 
     Structure Example 9 
     The container according to Structure Example 8, wherein each of the two sheets is a polypropylene sheet. 
     Structure Example 10 
     The container according to Structure Example 8 or 9, wherein in a case that the container is placed on a surface perpendicular to a direction of gravitation, the first swelling portion and the connecting portion contact the surface. 
     Structure Example 11 
     The container according to any one of Structure Examples 8 to 10, wherein on the second swelling portion, an image showing a manner of supply of the content is printed. 
     Structure Example 12 
     The container according to any one of Structure Examples 1 to 11, further comprising a cap provided detachably mountable on the end portion and configured to cover at least a part of the end portion, 
     wherein as viewed in the rotational axis direction, the outer edge of the flange portion is in a position spaced from the rotational axis than an outer edge of the cap is. 
     Structure Example 13 
     The container according to Structure Example 12, wherein the cap includes a main body portion covering at least a part of the end portion and a fixing portion for fixing the main body portion to the flange portion, the fixing portion being fixed to a fixation portion provided in a region of the flange portion between the outer peripheral surface and the arcuate portion of the rotatable member with respect to the radial direction, and 
     wherein the main body portion of the cap is separated from the fixing portion by being rotated about the rotational axis relative to the end portion in a state in which the fixing portion is fixed to the fixation portion of the flange portion. 
     Structure Example 14 
     The container according to any one of Structure Examples 1 to 13, wherein in a case that the arcuate portion and the connecting portion are a first arcuate portion and a first connecting portion, respectively, the first arcuate portion extends along the phantom circle between the first point and a third point on the phantom circle, the third point being in a position different from a position of the first point and the second point on the phantom circle, and 
     wherein the outer edge of the flange portion further includes a second arcuate portion extending along the phantom circle between the second point and a fourth point on the phantom circle and a second connecting portion which connects the third point and the fourth point and which is formed in a region inside the phantom circle, the fourth position being in a position different from the position of the first point, the position of the second point, and a position of the third point on the phantom circle. 
     Structure Example 15 
     An image forming system comprising: 
     a container according to any one of Structure Examples 1 to 14; and 
     an image forming apparatus including a mounting portion on which the container is mountable, 
     wherein when the container is mounted on the mounting portion, the mounting portion is constituted so that the accommodating portion and the flange portion are exposed to an outside of the image forming apparatus. 
     Structure Example 16 
     The image forming system according to Structure Example 15, wherein when the container in first attitude is moved toward the mounting portion along the rotational axis and is mounted on the mounting portion, the mounting portion includes a first opposing portion having a shape which opposes the arcuate portion of the flange portion with respect to the radial direction and which extends along the arcuate portion, and includes a second opposing portion having a shape which opposes the connecting portion with respect to the radial direction and which extends along the connecting portion, and 
     wherein in a case that the container in a second attitude in which the container is rotated about the rotational axis from the first attitude by 180 degrees is moved toward the mounting portion along the rotational axis, the arcuate portion of the flange portion and the second opposing portion of the mounting portion interfere with each other. 
     Structure Example 17 
     The image forming system according to Structure Example 15 or 16, wherein the image forming apparatus includes a discharging portion for discharging a recording material to an outside of the image forming apparatus by feeding the recording material in a discharging direction, and 
     wherein the connecting portion is positioned on a side upstream of the arcuate portion with respect to the discharging direction when the container is mounted on the mounting portion. 
     While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions. 
     This application claims the benefit of Japanese Patent Application No. 2021-185957 filed on Nov. 15, 2021, which is hereby incorporated by reference herein in its entirety.