Patent Publication Number: US-11650537-B2

Title: Developer supply container and developer supplying system

Description:
TECHNICAL FIELD 
     The present invention relates to a developer supply container dismountably mountable to a developer receiving apparatus and a developer supplying system. 
     BACKGROUND ART 
     Conventionally, in electrophotographic image forming apparatuses such as copying machines, fine developing powder such as toner has been used. In such an image forming apparatus, the developer consumed by the image formation is supplemented from a developer supply container. 
     For example, a structure has been proposed in which the developer supply container is mountable to and dismountable from a developer receiving apparatus provided in the image forming apparatus, and the developer receiving portion of the developer receiving apparatus is displaced toward the discharge opening of the developer supply container in accordance with the mounting operation of the developer supply container (JP2013-015826A). 
     SUMMARY OF THE INVENTION 
     Problems to be Solved by Invention 
     It is an object of the present invention to provide a developer supplying container and a developer supplying system capable of improving the sealing property of a connecting portion between a developer supply container and a developer receiving portion. 
     Means for Solving the Problem 
     There is provided a developer supply container detachably mountable to a developer receiving apparatus, said developer receiving apparatus including a developer receiving portion provided with a receiving port for receiving a developer and including a portion-to-be-engaged capable of displacing integrally with said developer receiving portion, said developer supply container comprising a rotatable developer accommodating portion for accommodating the developer; a discharging portion provided at a bottom side thereof with a discharge opening for discharging the developer accommodating in said developer accommodating portion; an engaging portion engageable with the portion-to-be-engaged with a mounting operation of said developer supply container to displace said developer receiving portion in a displacing direction so as to bring the receiving opening into fluid communication with said discharge opening; and a supporting portion provided upstream of said engaging portion in an inserting direction in which said developer accommodating portion is inserted into the developer receiving apparatus, said supporting portion extending in a direction of a rotational axis of said developer accommodating portion, and said supporting portion being capable of supporting the portion-to-be-engaged delivered from said engaging portion, and wherein when said discharge opening and the receiving opening are in fluid communication with each other, a maximum height of said engaging portion is higher than a supporting surface of said supporting portion which supports the portion-to-be-engaged. 
     Effect of the Invention 
     According to the present invention, it is possible to improve the sealing property of the connecting portion between the developer supply container and the developer receiving portion. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG.  1    shows a schematic structure diagram of an image forming apparatus according to Embodiment 1. 
         FIG.  2    is a perspective view of the image forming apparatus according to Embodiment 1. 
       Parts (a) and (b) of  FIG.  3    show a developer receiving apparatus according to Embodiment 1, in which part (a) is a perspective view thereof, and part (b) is a cross-sectional view thereof. 
       Parts (a), (b) and (c) of  FIG.  4    show a developer receiving apparatus according to Embodiment 1, in which part (a) is an enlarged partial perspective view thereof, part (b) is an enlarged cross sectional view thereof, and part (c) is a perspective view of a developer receiving portion. 
       Parts (a), (b) and (c) of  FIG.  5    show a developer supply container according to Embodiment 1, in which part (a) is a partially cut-away perspective view, part (b) is a cross-sectional view thereof around a flange portion, and (c) is a front elevational view thereof as viewed from a front side. 
         FIG.  6    is a perspective view of the container main body of the developer supply container according to Embodiment 1. 
       Parts (a) and (b) of  FIG.  7    show a flange portion in Embodiment 1, in which part (a) is a perspective view thereof, and (b) is a bottom view thereof. 
         FIG.  8    is a partial side view of an engaging portion according to Embodiment 1. 
       Part (a) of  FIG.  9    is a top plan view of the shutter according to Embodiment 1, and part (b) of  FIG.  9    is a perspective view thereof. 
       Part (a) of  FIG.  10    is a perspective view of a pump according to Embodiment 1, and (b) is a side view thereof. 
       Part (a) of  FIG.  11    is a perspective view of a reciprocating member according to Embodiment 1, and part (b) of  FIG.  11    is a perspective view thereof as seen from the opposite side of part (a) of  FIG.  11   . 
       Part (a) of  FIG.  12    is a perspective view of a cover according to Embodiment 1, and part (b) of  FIG.  12    is a perspective view thereof as seen from the opposite side to that in part (a) of  FIG.  12   . 
       Part (a) of  FIG.  13    is a side view of a state when the engaged portion is engaged with the first engaging surface in the engaging portion with the insertion of the developer supply container, according to Embodiment 1, part (b) of  FIG.  13    is a side view of the state when the engaged portion is located at the upstream side end portion in the mounting direction of the first engaging surface. 
       Part (a) of  FIG.  14    is a side view of the engaging portion according to Embodiment 1 in a state in which the engaged portion (portion to be engaged) is located at the projecting portion of a third engaging surface, and part (b) of  FIG.  14    is a side view of the state when the engaged portion is positioned on the second engaging surface as the mounting of the developer supply container is completed. 
       Part (a) of  FIG.  15    is a sectional view in a state in which the engaged portion is engaged with the first engaging surface in accordance with the insertion of the developer supply container at the connecting portion between the shutter opening and the receiving opening, according to Embodiment 1, and part (b) of  FIG.  15    is a sectional view of a state when the engaged portion is located at the upstream side end portion in the mounting direction of the first engaging surface. 
       Part (a) of  FIG.  16    is a cross-sectional view in a state that the engaged portion is positioned at the projecting portion of the third engaging surface at the connecting portion between the shutter opening and the receiving opening according to Embodiment 1, and part (b) of  FIG.  16    is a cross-sectional view of the state when the engaged portion is positioned on the second engaging surface as the mounting of the developer supply container is completed. 
       Part (a) of  FIG.  17    is a side view of a first modified example of the engaging portion according to Embodiment 1; part (b) of  FIG.  17    is a side view of a second modified example; and part (c) of  FIG.  17    is a side view of a third modified example. 
       Part (a) of  FIG.  18    is a side view of a fourth modified example of the engaging portion according to Embodiment 1; part (b) of  FIG.  18    is a side view of a fifth modified example; and part (c) of  FIG.  18    is a side view of a sixth modified example. 
         FIG.  19    is a perspective view of the engaging portion according to Embodiment 2. 
       Part (a) of  FIG.  20    is a side view in a state in which the engaged portion does not engage with the engaging portion in the engaging portion according to Embodiment 2, and part (b) of  FIG.  20    is a side view in a state the engaging portion is elastically deformed by the engaged portion. 
       Part (a) of  FIG.  21    is a side view of a modified example of the curved surface shape in the inclined portion according to Embodiment 2, and part (b) of  FIG.  21    is a side view of a modification of the step shape. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     Embodiment 1 
     In the following, referring to part (c) of  FIGS.  1 - 18   , Embodiment 1 of the present invention will be described. First, referring to  FIG.  1    and  FIG.  2   , a schematic structure of the image forming apparatus of this embodiment will be described. 
     Image Forming Apparatus 
     In  FIG.  1   , the image forming apparatus  100  includes an original reading device  103  at a top of a main assembly  100   a  of the image forming apparatus. An original  101  is placed on an original platen glass  102 . A light image corresponding to image information of the original  101  is imaged, using a plurality of minors M and the lens Ln of the original reading device  103 , on a photosensitive drum  104  which is a cylindrical photosensitive member as an image bearing member to form an electrostatic latent image. This electrostatic latent image is visualized using toner (one component magnetic toner) as a developer (dry powder) by a dry type developing device (one-component developing device)  201 . Here, in this embodiment, a one-component magnetic toner is used as the developer to be supplied from the developer supply container  1  (also referred to as a toner cartridge), but the present invention is not limited to such an example, and it may be of a structure as will be described hereinafter. 
     More specifically, in the case of using a one-component developing device which performs developing operation with one component nonmagnetic toner, one component nonmagnetic toner is supplied as a developer. In addition, non-magnetic toner is supplied as the developer when using a two-component developer which develops the image using a two component developer prepared by mixing magnetic carrier and nonmagnetic toner. In this case, as the developer, a structure may be employed in which the magnetic carrier is also supplied together with the non-magnetic toner. 
     As described above, a developing device  201  shown in  FIG.  1    develops the electrostatic latent image formed on the photosensitive drum  104  using the toner as the developer based on the image information of the original  101 . In addition, a developer supplying system  200  is connected to developing machine  201 , and the developer supplying system  200  includes a developer supply container  1  and a developer receiving apparatus  8  relative to which the developer supply container  1  is mountable and dismountable. Developer supplying system  200  will be described hereinafter. 
     The developing device  201  includes a developer hopper portion  201   a  and a developing roller  201   f . In this developer hopper portion  201   a , a stirring member  201   c  for stiffing the developer supplied from the developer supply container  1  is provided. The developer stirred by the stirring member  201   c  is fed to a feeding member ( 201   e ) side by a feeding member  201   d . And, the developer which has been sequentially fed by the feeding members  201   e  and  201   b  is carried on the developing roller  201   f  and finally supplied to a developing zone formed with the photosensitive drum  104 . In this embodiment, a one-component developer is used, and therefore, toner as a developer from the developer supply container  1  is supplied to the developing device  201 , but when using a two component developer, toner and carrier as a developer may be supplied from the developer supply container. 
     Cassettes  105  to  108  contain recording materials S such as sheets of paper. When an image is to be formed, a cassette containing an optimum recording material S among the sheets contained in these cassettes  105  to  108  is selected on the basis of the information inputted by the operator (user) on the operation portion  100   d  ( FIG.  2   ) of the image forming apparatus  100  or on the basis of the size of the original  101 . Here, as for the recording material S, it is not limited to sheets of paper, but it may be an OHP sheet or the like as the case may be. One sheet of recording material S fed by the feeding and separating devices  105 A to  108 A is fed to registration rollers  110  by way of a feeding portion  109 . Then, the recording material S is fed in synchronization with the rotation of the photosensitive drum  104  and the scan timing of the original reading device  103 . 
     A transfer charging device  111  and a separating charging device  112  are provided at positions opposing the photosensitive drum  104  on a downstream side of the registration roller  110  in the recording material feeding direction. The image of the developer (toner image) formed on the photosensitive drum  104  is transferred onto the recording material S fed by the registration roller  110 , by a transfer charging device  111 . And, the recording material S onto which the toner image is transferred is separated from the photosensitive drum  104  by a separation charging device  112 . Subsequently, heat and pressure are applied to the recording material S fed by the feeding portion  113  in a fixing portion  114 , so that the toner image is fixed on the recording material. Thereafter, the recording material S to which the toner image is fixed passes through a discharge/reversing portion  115  and is discharged to the discharge tray  117  by the discharge roller  116 , in case of single-sided copy. 
     On the other hand, in case of double-sided copy, the recording material S passes through the discharge/reversing portion  115 , and the recording material S is partly discharged to the outside of the apparatus once by the discharge roller  116 . After this, at the timing when a trailing end of the recording material S passes through the switching member  118  and is still nipped by the discharge rollers  116 , the position of the switching member  118  is switched, and the discharge roller  116  is rotated counterclockwise, by which the recording material S is fed again into the apparatus. Thereafter, the recording material S is fed to the registration roller  110  by way of the re-feeding and feeding portions  119  and  120 , and is discharged to the discharge tray  117  by way of the same path as in the case of single-sided copying. 
     In the image forming apparatus  100  having the above-described structure, image forming process devices such as a developing device  201 , a cleaner portion  202 , a primary charging device  203  and the like are provided around the photosensitive drum  104 . Here, the developing device  201  supplies the developer to the electrostatic latent image formed on the photosensitive drum  104  on the basis of the image information of the original  101  read by the original reading device  103  so as to develop the electrostatic latent image. In addition, the primary charging device  203  uniformly charges the surface of the photosensitive drum to form a desired electrostatic latent image on the photosensitive drum  104 . Furthermore, the cleaner portion  202  has a function of removing the developer remaining on the photosensitive drum  104 . 
     As shown in  FIG.  2   , when the operator opens a replacement cover  40  which is a portion of an outer cover of the apparatus main assembly  100   a  of the image forming apparatus  100 , a part of the developer receiving apparatus  8  which will be described hereinafter can be seen. And, by inserting the developer supply container  1  into this developer receiving apparatus  8 , the developer supply container  1  is mounted in a state where it can supply the developer to the developer receiving apparatus  8 . On the other hand, when the operator exchanges the developer supply container  1 , it carries out the operation opposite to the loading operation, by which the developer supply container  1  is dismounted from the developer receiving apparatus  8 , and thereafter a new developer supply container  1  can be mounted. Here, the replacement cover  40  is a cover exclusively for mounting/dismounting (exchanging) the developer supply container  1 , and is opened and closed only for dismounting/mounting the developer supply container  1 . On the other hand, the maintenance operation for the image forming apparatus  100  is performed by opening/closing a front cover  100   c . Here, the replacement cover  40  and the front cover  100   c  may be integrated. In such a case, the replacement of the developer supply container  1  and the maintenance of the image forming apparatus  100  are performed by opening and closing the integrated cover (not shown). 
     Developer Receiving Apparatus 
     Next, referring to part (a) of  FIG.  3    to part (c) of  FIG.  4   , the developer receiving apparatus  8  constituting the developer supplying system  200  will be described. As shown in part (a) of  FIG.  3   , the developer receiving apparatus  8  is provided with a mounting portion (mounting space)  8   f  to which the developer supply container  1  is dismountably mounted. The mounting portion  8   f  is provided with an insertion guide  8   e  for guiding the developer supply container  1  in the mounting and dismounting directions. In the case of this embodiment, the structure is such that the dismounting direction B of the developer supply container  1  is opposite to the direction A of mounting the developer supply container  1  by the insertion guide  8   e.    
     As shown in part (a) of  FIG.  3    to part (a) of  FIG.  4   , the developer receiving apparatus  8  has a drive gear  9  which functions as a driving mechanism for driving the developer supply container  1 . A rotational driving force is transmitted to the actuating gear  9  from a driving motor  500  by way of a driving gear train (not shown), so that the actuating gear  9  applies the rotational driving force to the developer supply container  1  mounted in the mounting portion  8   f . The operation of the drive motor  500  is controlled by the control device  600 . 
     In addition to controlling the driving motor  500 , the control device  600  controls overall of the image forming apparatus  100 . The control device  600  has a CPU (Central Processing Unit), a ROM (Read Only Memory), and a RAM (Random Access Memory). The CPU controls each portion while reading the program corresponding to a control procedure stored in the ROM. In addition, working data and an input data are stored in the RAM, and the CPU executes control while looking up the data stored in the RAM on the basis of the program etc. 
     In the mounting portion  8   f  of the developer receiving apparatus  8 , there is provided a developer receiving portion  11  for receiving the developer discharged out of the developer supply container  1 . The developer receiving portion  11  is connected to a container discharge opening  3   a   4  (part (b) of  FIG.  16   ) of the developer supply container  1  when the developer supply container  1  is mounted, and has a receiving opening  11   a  for receiving the developer discharged through the container discharge opening  3   a   4 . The developer receiving portion  11  is mounted so as to be movable (displaceable) in the direction in which the receiving opening  11   a  moves toward and away from the container discharge opening  3   a   4  (in this embodiment, the direction crossing with the direction A in which the developer supply container  1  is mounted (more specifically, vertical direction relative to the developer receiving apparatus  8 )). As shown in part (b) of  FIG.  3   , in the case of this embodiment, the developer receiving portion  11  is urged by an urging member (urging portion)  12 , including a helical compression coil spring, for example, in such a direction that the receiving opening  11   a  moves away from the container discharge opening  3   a   4  (vertically downward, reverse direction to a direction of displacement). Therefore, the developer receiving portion  11  moves against the urging force of the urging member  12  when the receiving opening  11   a  moves toward the container discharge opening  3   a   4  (upward in the vertical direction). Here, in the present specification, the direction in which the developer receiving portion  11  displaces in accordance with the mounting operation of the developer supply container  1  is an upward direction in the vertical direction. This direction is called upward (displacing direction) U, and the downward vertical direction in the opposite direction is called the downward direction D. 
     In addition, as shown in part (a) of  FIG.  4   , in the mounting portion  8   f  of the developer receiving apparatus  8 , a first shutter stopper portion  8   a  and a second shutter stopper portion  8   b  are provided on the upstream side of the developer receiving portion  11  in the mounting direction A. In the developer supply container  1  which is moving relative to the developer receiving apparatus  8  during mounting/dismounting, the first and second shutter stopper portions  8   a  and  8   b  regulate the relative movement of the shutter  4  (part (b) of  FIG.  5   ) which will be described hereinafter relative to the developer receiving apparatus  8 . In this case, the shutter  4  moves relative to a part of the developer supply container  1  other than the shutter  4 , such as the container main body  2  described hereinafter. 
     As shown in part (b) of  FIG.  3    and part (b) of  FIG.  4   , below, in the downward direction D, of the developer receiving apparatus  8 , there is provided a sub-hopper  8   c  for temporarily storing the developer supplied from the developer supply container  1 . Inside the sub-hopper  8   c , there are provided a feeding screw  14  for feeding the developer to the developer hopper portion  201   a  ( FIG.  1   ) which is a portion of the developing device  201 , and an opening  8   d  communicating with the developer hopper portion  201   a.    
     As shown in part (c) of  FIG.  4   , the developer receiving portion  11  is provided with a main assembly seal (sealing member)  13  formed so as to surround the receiving opening  11   a . The main assembly seal  13  is made of elastic material, foam or the like. In this embodiment, the thickness when no load acts on the main assembly seal  13  is 3.0 mm (part (a) in  FIG.  15   ). As shown in part (b) of  FIG.  16   , in the state that the developer supply container  1  is mounted, the main assembly seal  13  is in close contact with an opening seal  3   a   5  surrounding the container discharge opening  3   a   4  of the developer supply container  1 , with the shutter  4  described hereinafter sandwiched therebetween. By this, the developer discharged through the container discharge opening  3   a   4  of the developer supply container  1  to the receiving opening  11   a  by way of the shutter opening (discharge port)  4   j  of the shutter  4  does not leak out of the receiving opening  11   a  which is a part of the developer feeding passage. That is, the main assembly seal  13  is provided around the receiving opening  11   a , and when the communication between the receiving opening  11   a  and the shutter opening  4   j  is established, the sealing is performed by elastic deformation between the receiving opening  11   a  and the shutter opening  4   j.    
     Here, it is desirable that a diameter of the receiving opening  11   a  is substantially the same as or slightly larger than a diameter of the shutter opening  4   j  of the shutter  4 , in order to prevent the interior of the mounting portion  8   f  from being contaminated by the developer. This is because if the diameter of the receiving opening  11   a  is smaller than the diameter of the shutter opening  4   j , the developer discharged from the shutter opening  4   j  is more likely to be deposited on the upper surface of the main assembly seal  13 . If the developer is deposited on the lower surface of the developer supply container  1  at the time of mounting/dismounting operation of the developer supply container  1 , it becomes a cause of contamination by the developer. In view of this point, it is preferable that the diameter of the receiving opening  11   a  is roughly the same as or about 2 mm larger than the diameter of the shutter opening  4   j . For example, in the case that the diameter of the shutter opening  4   j  of the shutter  4  is a fine hole (pinhole) of about 2 mm in diameter, it is preferable that the diameter of the receiving opening  11   a  is about 3 mm. 
     In addition, as shown in part (c) of  FIG.  4   , on the side surface of the developer receiving portion  11 , an engaged portion (portion to be engaged)  11   b  projecting toward the center side is provided. In the case of this embodiment, the engaged portion  11   b  is directly engaged with the engaging portion  30  (part (a) in  FIG.  7   ) provided in the developer supply container  1  which will be described hereinafter, and is guided by the engaging portion  30 , by which the developer receiving portion  11  is lifted toward the developer supply container  1  in the upward direction U. 
     Developer Supply Container 
     Next, referring to part (a)  FIG.  5    to part (b) of  FIG.  12   , the developer supply container  1  constituting the developer supplying system  200  will be described. First, referring to part (a) of  FIG.  5    and part (b) of  FIG.  5   , the overall structure of the developer supply container  1  will be described. The developer supply container  1  mainly includes the container main body  2 , a flange portion  3 , the shutter  4 , a pump portion  5 , a reciprocating member  6 , and a cover  7 . The container body  2  supplies the developer to the developer receiving apparatus  8  by rotating in the developer receiving apparatus  8  in the direction indicated by an arrow R about the rotation axis P shown in part (a) of  FIG.  5   . In the following, each element constituting the developer supply container  1  will be described in detail. In this embodiment, the direction of the rotation axis P is the rotation axis direction, and is the same direction as the mounting/dismounting direction parallel to the inserting direction A and the removing direction B. 
     Container Body 
     As shown in  FIG.  6   , the container main body  2  mainly comprises a developer accommodating portion  2   c  for containing the developer. In addition, the container main body  2  is provided with a helical feeding groove  2   a  (feeding portion) for feeding the developer in the developer accommodating portion  2   c  by rotating the container main body  2  in the direction of the arrow R around the rotation axis P. That is, the developer accommodating portion  2   c  is rotatable relative to the discharge portion  300 . In addition, a cam groove  2   b  and a drive receiving portion  2   d  for receiving a driving force from the main assembly side are integrally formed over the entire periphery of the outer circumferential surface of the container main body  2  on one end side. Here, in this embodiment, the cam groove  2   b  and the drive receiving portion (gear)  2   d  are integrally formed with the container body  2 , but the cam groove  2   b  or the drive receiving portion  2   d  may be formed as a separate member and may be integrally mounted to the container body  2 . In addition, in this embodiment, for example, a toner including a volume average particle diameter of 5 μm to 6 μm is accommodated in the developer accommodating portion  2   c  as the developer. In addition, in this embodiment, the developer accommodating portion  2   c  includes not only the container main body  2  but also the interior spaces of the flange portion  3  and the pump portion  5  which will be described hereinafter. 
     Flange Portion 
     Referring to part (a) of  FIG.  5   , part (b) of  FIG.  5   , part (a) of  FIG.  7    and part (b) of  FIG.  7   , the flange portion  3  will be described. The flange portion  3  is mounted so as to be rotatable relative to the container body  2  about the rotation axis P. And, when the developer supply container  1  is mounted to the developer receiving apparatus  8 , the flange portion  3  is held so as not to rotate in the arrow R direction relative to the mounting portion  8   f  (part (a) of  FIG.  3   ). In addition, as shown in part (b) of  FIG.  7   , a container discharge opening  3   a   4  is provided in a portion of the flange portion  3 , and an opening seal  3   a   5  is mounted to the periphery thereof. As shown in part (b) of  FIG.  5   , the flange portion  3  is provided with the pump portion  5 , the reciprocating member  6 , the shutter  4 , and the cover  7 . 
     First, the pump portion  5  is threaded at one end side (mounting direction A) of the flange portion  3 , and the container body  2  is connected to the other end side (side in the dismounting direction B) with a sealing member (not shown) therebetween. In addition, a reciprocating member  6  is provided so as to sandwich the pump portion  5 , and the engaging projection  6   b  (parts (a) and (b) of  FIG.  11   ) provided on the reciprocating member  6  is engaged with the cam groove  2   b  ( FIG.  6   ). The flange portion  3  is provided with the shutter  4 . In this embodiment, the flange portion  3  and the shutter  4  constitute a discharge portion  300  for discharging the developer accommodated in the developer accommodating portion  2   c  out. In addition, the surface on which the shutter  4  is provided is the bottom side of the flange portion  3 , more particularly, the top surface of the bottom portion  3   d . In order to improve an outer appearance and to protect the reciprocating member  6  and pump portion  5 , the cover  7  is integrally assembled so as to cover the whole of the flange portion  3 , the shutter  4 , the pump portion  5 , and the reciprocating member  6  as shown in parts (a) and (b) of  FIG.  5   . 
     In addition, as shown in parts (a) and (b) of  FIG.  7   , the flange portion  3  has a flat bottom portion  3   d  provided horizontally and an opening portion  3   e  formed in a substantially central portion of the bottom portion  3   d , the opening portion  3   e  penetrating in a vertical direction. As shown in part (b) of  FIG.  5   , the bottom portion  3   d  slidably supports the shutter  4  at the lower portion. As shown in part (b) of  FIG.  15    through part (b) of  FIG.  16   , when the main assembly seal  13  and the receiving opening  11   a  of the developer receiving portion  11  are displaced in the upward direction U, they pass through the opening portion  3   e.    
     Engaging Portion 
     As shown in part (a) of  FIG.  7   , a flange portion  3  has an engaging portion  30  engageable with the engaged portion (portion to be engaged)  11   b  (part (a) of  FIG.  3   ) of the developer receiving portion  11 . The engaging portion  30  engages with the engaged portion  11   b  with the mounting operation of the developer supply container  1  to displace the developer receiving portion  11  in the upward direction U, so that the receiving opening  11   a  comes into fluid communication with the shutter opening  4   j  (part (b) of  FIG.  16   ). At this time, the developer supply container  1  and the developer receiving portion  11  are in a state that the developer supply from the developer supply container  1  to the developer receiving portion  11  is possible (a state in which the developer supply container  1  and the developer receiving portion  11  are connected to each other). In addition, the engaging portion  30  guides the developer receiving portion  11  so as to be displaced in the downward direction D apart from the developer supply container  1  along with the removal operation of the developer supply container  1 , so that the connection state between the developer supply container  1  and the developer receiving portion  11  is ceased. Here, as shown in parts (a) and (b) of  FIG.  7   , in this embodiment, the engaging portion  30  is provided on each lateral sides with respect to the widthwise direction which is perpendicular to the direction of insertion and removal of the flange portion  3  and perpendicular to the vertical direction. 
     As shown in part (a) of  FIG.  7    and  FIG.  8   , the engaging portion  30  has an inclined portion  31  and a parallel portion  32 . In this embodiment, the inclined portion  31  and the parallel portion  32  are formed separately from the flange portion  3  and is integrated with the flange portion  3  by adhesion or the like. Part (c) of  FIG.  5    is a front view of the developer supply container  1 . As shown in part (c) of  FIG.  5   , the engaging portion  30  is disposed below a plane H including the rotation axis P. Also, the plane H including the rotation axis P is a horizontal plane, and the engaging portion  30  is disposed below this horizontal plane. Here, the inclined portion  31  and the parallel portion  32  and the flange portion  3  may be integrally formed by injection molding or the like. A first engaging surface  31   a  and a third engaging surface  33   a  are formed on the inclined portion  31 . A second engaging surface  32   a  is formed on the parallel portion  32 . Although details will be described hereinafter, the engaging portion of this embodiment has the following structure. The inclined portion (first portion)  31  and the parallel portion (second portion)  32  extending from the lower end (the first position) toward the upper end (the second position) constitute the tracks where the engaged portion  11   b  passes. And, as shown in part (c) of  FIG.  5   , the track is arranged below the plane H. Also, when the plane including the rotation axis is imagined, the discharge opening and the track are provided in the same region (lower region). In such a case, the parallel portion  32  is disposed at a position closer to the horizontal plane H or the imaginary plane than the inclined portion  31 . Also, in this embodiment, in the developer receiving portion  11 , the engaged portion  11   b  and the receiving opening are on the same plane perpendicular to the rotation axis P. As a result, the engaged portion  11   b  and the parallel portion  32  are on the same plane perpendicular to the rotation axis P. The engaged portion  11   b  is engaged with this track, and the engaged portion  11   b  is lifted so that the discharge opening and the receiving opening can communicate with each other. And, when the communication path is formed, a discharge path is formed between the inside of the developer supply container and the discharge opening so that the developer in the developer supply container can be discharged toward the receiving port. 
     The first engaging surface  31   a  is in a range from the lowermost portion to the upstream side end portion  31   b  of the upper surface of the inclined portion  31  and is provided so as to be directed upwardly U as going to upstream side in the mounting direction A. That is, the first engaging surface  31   a  is provided so as to be upward in the vertical direction toward the developer accommodating portion  2   c  of the developer supply container  1 . In this embodiment, the first engaging surface  31   a  has an inclined planar shape. The upstream side end portion (the end portion on the developer accommodating portion  2   c  side)  31   b  of the first engaging surface  31   a  in the mounting direction A is formed so that the developer receiving portion  11  is displaced by which the main assembly seal  13  is pressed around the shutter opening  4   j  (part (b) of  FIG.  15   ). With the inserting/removing operation of the developer supply container  1  relative to the developer receiving device  8 , the first engaging surface  31   a  guides the engaged portion  11   b  so as to displace the developer receiving portion  11  in a direction toward and away from the developer supply container  1 . In addition, in the direction of the rotation axis P, the inclined portion  31  has a shape to be upward as approaching to the drive receiving portion  2   d . Here, in this embodiment, the inclined portion  31  has a linear shape. The inclination angle of the inclined portion  31  relative to the mounting/dismounting direction of the developer supply container  1  is desirably 10 to 50 degrees. In this embodiment, the angle is approx. 40 degrees. However, the shape of the inclined portion  31  is not limited to that of this embodiment as long as it is a shape extending upward as approaching to the drive receiving portion  2   d . For example, the shape of the inclined portion  31  may be a shape of an inclined surface including a curved surface shape as shown in part (a) of  FIG.  21   . Or, it may have a stepped shape including a parallel surface and an inclined surface as shown in part (b) of  FIG.  21   . 
     The second engaging surface  32   a  is disposed on the upstream side of the first engaging surface  31   a  in the mounting direction A and is an upper surface of the parallel portion  32  and further is a parallel surface provided substantially parallel to the mounting direction A. The second engaging surface  32   a  is provided closer the side of the developer accommodating portion  2   c  than the first engaging surface  31   a , and it engages with the engaged portion  11   b  when the receiving opening  11   a  communicates with the shutter opening  4   j . The second engaging surface  32   a  is provided at the same height (position) as the height (position) of the upstream side end portion  31   b  in the mounting direction A of the first engaging surface  31   a . The second engaging surface  32   a  has a function of maintaining a state that the container discharge opening  3   a   4  and the receiving opening  11   a  of the developer receiving portion  11  communicate with each other in a constant positional relationship (part (b) of  FIG.  16   ) in the case where the developer supply container  1  is inserted into and removed out of the developer receiving device  8 . In the first engaging surface  31   a  and the second engaging surface  32   a , the position of the end portion of the first engaging surface  31   a  on the side of the developer accommodating portion  2   c  in the vertical direction is higher than the of the second engaging surface  32   a.    
     The third engaging surface  33   a  is provided continuously with the upstream side end portion  31   b , in the mounting direction A, of the first engaging surface  31   a  in the inclined portion  31  of the upper surface of the inclined portion  31 , and it has only one projecting portion  33  which projects in the upward direction U beyond the second engaging surface  32   a . That is, the first engaging surface  31   a  and the third engaging surface  33   a  are continuous and are integrally molded. In this embodiment, the third engaging surface  33   a  has a surface formed on the upper portion of the projecting portion  33  and parallel to the inserting/removing direction. That is, the second engaging surface  32   a  and the third engaging surface  33   a  are substantially parallel with each other. The third engaging surface  33   a  is provided so as to continuously guide the engaged portion  11   b  between the first engaging surface  31   a  and the second engaging surface  32   a . The upper end portion of the projecting portion  33  of the third engaging surface  33   a  passes over the upstream side end portion  31   b , in the mounting direction A, of the first engaging surface  31   a  and over the second engaging surface  32   a  in the upward direction U, and extends in the upward direction U by the distance L 1 . That is, the third engaging surface  33   a  is provided between the first engaging surface  31   a  and the second engaging surface  32   a  in the direction of the rotation axis P of the developer accommodating portion  2   c , and is higher than the second engaging surface  32   a  in the vertical direction. Therefore, when the third engaging surface  33   a  guides the engaged portion  11   b  in the process of inserting the developer supply container  1  into the developer receiving device  8 , the operation is as follows. That is, in this process, the developer receiving portion  11  is displaced upward U (closer to the developer supply container  1 ) by the distance L 1  than the position at which the engaging portion  30  maintains the developer receiving portion  11  (the height of the second engaging surface  32   a ), by the third engaging surface  33   a.    
     Shutter 
     Next, referring to parts (a) and (b) of  FIG.  9    the shutter  4  will be described. The shutter  4  slidable on the upper surface of the bottom portion  3   d  (part (a) of  FIG.  7   ) of the flange portion  3  move relative to a portion (flange portion  3 ) of the developer supply container  1 . The shutter  4  has a shutter opening  4   j  as a discharge opening, and opens and closes the container discharge opening  3   a   4  (part (b) in  FIG.  7   ) of the developer supply container  1  in accordance with the mounting and dismounting operation of the developer supply container  1 . That is, by moving the shutter  4  relative to the developer supply container  1  in accordance with the mounting operation of the developer supply container  1 , the receiving opening  11   a  of the developer receiving portion  11  and the shutter opening  4   j  communicate with each other, and in addition with the container discharge opening  3   a   4 . By this, the developer in the developer supply container  1  can be discharged to the receiving opening  11   a . That is, the discharge portion  300  (part (b) of  FIG.  5   ) for discharging the developer is constituted by the flange portion  3  and the shutter  4 , and the shutter  4  of the discharge portion  300  is provided at the bottom with the shutter opening  4   j  as the discharge opening for discharging the developer. 
     In addition, the shutter  4  is provided with a connecting surface  4   k  connected to the developer receiving portion  11  so as to surround the shutter opening  4   j , on the sliding surface  4   i  opposite to the bottom portion  3   d  (part (a) of  FIG.  15   ). The connecting surface  4   k  has a larger diameter than the shutter opening  4   j  and is parallel to the sliding surface  4   i . After mounting the developer supply container  1 , the upper end surface of the main assembly seal  13  is brought into close contact with the connecting surface  4   k  (part (b) of  FIG.  16   ). 
     On the other hand, as shown in parts (a) and (b) of  FIG.  9   , a developer sealing portion  4   a  is provided at a position deviated from the shutter opening  4   j  of the shutter  4 . The developer sealing portion  4   a  closes the container discharge opening  3   a   4 , and as the shutter  4  moves relative to the developer supply container  1  in accordance with the operation of taking out the developer supply container  1 . In addition, the developer sealing portion  4   a  prevents leakage of the developer from the container discharge opening  3   a   4 , when the developer supply container  1  is not mounted to the mounting portion  8   f  (part (a) of  FIG.  3   ) of the developer receiving apparatus  8 . A sliding surface  4   i  sliding on the upper surface of the bottom portion  3   d  of the flange portion  3  is provided on a back surface side (the developer receiving portion  11  side) of the developer sealing portion  4   a . Here, the shutter  4  is engaged with the flange portion  3  in an attitude in which the developer sealing portion  4   a  faces upward. 
     The shutter  4  is provided with a first stopper portion  4   b  and a second stopper portion  4   c  held by first and second shutter stopper portions  8   a  and  8   b  (part (a) of  FIG.  4   ) of the developer receiving apparatus  8  doing so that the developer supply container  1  is capable of moving relative to the shutter  4 . In addition, the shutter  4  is provided with a support portion  4   d  for displaceably supporting the first and second stopper portions  4   b  and  4   c . The support portion  4   d  is elastically deformable and extends from one side to other side of the developer sealing portion  4   a . And, the first stopper portion  4   b  and the second stopper portion  4   c  are provided at the free end portion of the support portion  4   d . By this, the first and second stopper portions  4   b ,  4   c  can be displaced by the elasticity of the support portion  4   d.    
     Here, the first stopper portion  4   b  is inclined so that an angle α formed by the first stopper portion  4   b  and the support portion  4   d  is an acute angle. On the contrary, the second stopper portion  4   c  is inclined so that an angle β formed by the second stopper portion  4   c  and the support portion  4   d  is an obtuse angle. 
     When the developer supply container  1  is mounted, the first stopper portion  4   b  is engaged with the guide portion  8   g  of the developer receiving apparatus  8  and is displaced to pass through the second shutter stopper portion  8   b , thus engaging with the first shutter stopper portion  8   a . As the first stopper portion  4   b  and the first shutter stopper portion  8   a  are engaged with each other, the position of the shutter  4  with respect to the developer receiving apparatus  8  is fixed. The second stopper portion  4   c  is engaged with the second shutter stopper portion  8   b  of the developer receiving apparatus  8  to release the first stopper portion  4   b  from the first shutter stopper portion  8   a  at the time of removing the developer supply container  1 . By this, the shutter  4  is dismounted from the developer receiving apparatus  8 . 
     Pump Portion 
     Referring to parts (a) and (b) of  FIG.  10   , the pump portion  5  will be described. The pump portion  5  alternately and repeatedly changes the internal pressure of the developer accommodating portion  2   c , switching between a state lower than the atmospheric pressure and a state higher than atmospheric pressure by the driving force received by the drive receiving portion  2   d  of the container body  2  ( FIG.  6   ). In this embodiment, in order to stably discharge the developer through the small container discharge opening  3   a   4  as described above, the pump portion  5  is provided at a portion of the developer supply container  1 . The pump portion  5  is a displacement type pump in which a volume is changed. More specifically, the pump portion  5  employed in this embodiment has a bellows-like stretchable member capable of expanding and contracting. 
     The pressure inside the developer supply container  1  is changed by the expansion and contracting operations of the pump portion  5 , and the developer is discharged by utilizing the pressure. More specifically, when the pump portion  5  is contracted, the interior of the developer supply container  1  is brought into a compressed state, and the developer is pushed out to discharge through the container discharge opening  3   a   4  of the developer supply container  1 . In addition, when the pump portion  5  is expanded, the interior of the developer supply container  1  is brought into a reduced pressure state, and the air is taken in from the outside through the container discharge opening  3   a   4 . By air taken in, the developer in the container discharge opening  3   a   4  and in the neighborhood of the reservoir  3   a   3  (part (a) in  FIG.  7   ) that stores the developer transported from the container body  2  of the flange portion  3  is loosened and smoothly discharged. 
     That is, in the neighborhood of the container discharge opening  3   a   4  of the developer supply container  1  and the neighborhood of the storage portion  3   a   3 , the developer in the developer supply container  1  may gather due to vibrations imparted when transporting the developer supply container  1  and so on, with the possible result that the developer is caked in this portion. Therefore, as described above, the air is taken in through the container discharge opening  3   a   4 , so that it is possible to loosen the developer that has been caked. In addition, in the usual discharging operation of the developer, as air is taken in as described above, the air and the powder as the developer are mixed with the result that the flowability of the developer is enhanced, and therefore, clogging of the developer does not easily occur, as an additional advantage. By repeatedly performing the expansion and contracting operation as described above, the developer is discharged. 
     As shown in part (a) of  FIG.  10   , in the pump portion  5 , a junction portion  5   b  is provided so as to be able to be joined with the flange portion  3  on the opening end side (dismounting direction B). In this embodiment, screw threads are formed as the joint portion  5   b . In addition, as shown in part (b) of  FIG.  10   , the pump portion  5  has a reciprocating member engaging portion  5   c  which engages with the reciprocating member  6  (parts (a) and (b) of  FIG.  11   ), which will be described hereinafter, on the other end side (the mounting direction A side) opposite to the opening end. 
     In addition, the pump portion  5  has a bellows-shaped expandable portion (bellows portion, expansion and contraction member)  5   a  in which crests and bottoms are alternately formed periodically. The expansion and contraction portion  5   a  is capable of contracting by moving the reciprocating member engaging portion  5   c  in the dismounting direction B with respect to the joining portion  5   b  along the folding lines (with folding lines as the base point), and is capable of expanding by moving reciprocating member engaging portion  5   c  in the mounting direction A. Therefore, when the bellows-like pump portion  5  as employed in this embodiment, it is possible to reduce variations in volumetric change with respect to the expansion and contraction amount, and therefore, it is possible to accomplish the stable volumetric change. 
     Here, in this embodiment, polypropylene resin is used as the material of the pump portion  5 , but the present invention is not limited to this example. As for the material (material) of the pump portion  5 , any material may be used as long as it has an expansion and contraction function and is capable of changing the internal pressure of the developer accommodating portion by changing the volume. For example, ABS (acrylonitrile-butadiene-styrene copolymer), polystyrene, polyester, polyethylene, and so on are usable. Or, rubber, other stretchable materials or the like can also be used. 
     Reciprocating Member 
     Referring to parts (a) and (b) of  FIG.  11   , the reciprocating member  6  will be described. In order to change the volume of the pump portion  5 , the reciprocating member  6  is provided with a pump engaging portion  6   a  (part (b) of  FIG.  13   ) which engages with the reciprocating member engaging portion  5   c  provided on the pump portion (part (b) of  FIG.  10   ). In addition, the reciprocating member  6  is provided with an engaging projection  6   b  to be engaged with the above-described cam groove  2   b  ( FIG.  6   ) at the time of assembly. The engaging projection  6   b  is provided at the free end portion of the arm  6   c  extending in the mounting and dismounting direction from the neighborhood of the pump engaging portion  6   a . In addition, the reciprocating member  6  is regulated in rotation around the rotation axis P (part (a) of  FIG.  5   ) of the arm  6   c  by the reciprocating member holding portion  7   b  (part (b) of  FIG.  12   ) of the cover  7  which will be described hereinafter. Therefore, when the container main body  2  is driven by the drive receiving portion  2   d  by the driving gear  9 , and the cam groove  2   b  rotates integrally, the reciprocating member  6  reciprocates back and forth in the directions An and B by the urging action of the engaging projection  6   b  fitted in the cam groove  2   b  and the reciprocating member holding portion  7   b  of the cover  7 . Accordingly, the pump portion  5  engaged with the pump engaging portion  6   a  of the reciprocating member  6  by way of the reciprocating member engaging portion  5   c  expands and contracts in the dismounting direction B and the mounting direction A. 
     Cover 
     Referring to parts (a) and (b) of  FIG.  12   , the cover  7  will be described. As described above, the cover  7  is provided as shown in part (b) of  FIG.  5    for the purpose of improving the appearance of the developer supply container  1  and protecting the reciprocating member  6  and the pump portion  5 . In more detail, the cover  7  is provided so as to cover the entirety of the flange portion  3 , the pump portion  5 , and the reciprocating member  6 . As shown in part (a) of  FIG.  12   , the cover  7  is provided with a guide groove  7   a  to be guided by the insertion guide  8   e  (part (a) of  FIG.  3   ) of the developer receiving apparatus  8 . In addition, as shown in part (b) of  FIG.  12   , the cover  7  is provided with a reciprocating member holding portion  7   b  for restricting rotation of the reciprocating member  6  about the rotation axis P (part (a) of  FIG.  5   ). 
     Mounting Operation of Developer Supplying Container 
     Referring to parts (a) of  FIG.  13    to (b) of  FIG.  16   , the operation of mounting the developer supply container  1  to the developer receiving apparatus  8  will be described. Here, part (a) of  FIG.  13    to part (b) of  FIG.  14    show the positional relationship of the engaging portion  30 , the engaged portion  11   b  and the developer receiving portion  11 , in the insertion and removal direction and in the up and down direction. In addition, part (a) of  FIG.  15    to part (b) of  FIG.  16    shows a connecting portion between the shutter opening  4   j  and the receiving opening  11   a . Also, part (a) of  FIG.  13    and Part (a) of  FIG.  15    show the state when the engaged portion  11   b  is engaged with the first engaging surface  31   a  as the developer supply container  1  is inserted, part (b) of  FIG.  13    and part (b) of  FIG.  15    show the state when the engaged portion  11   b  is positioned at the upstream side end portion  31   b , in the mounting direction A, of the first engaging surface  31   a . In addition, part (a) of  FIG.  14    and Part (a) of  FIG.  16    show the state when the engaged portion  11   b  is positioned at the projecting portion  33  of the third engaging surface  33   a , and part (b) of  FIG.  14    and part (b) of  FIG.  16    show the state when the engaged portion  11   b  is positioned on the second engaging surface  32   a  as the mounting of the developer supply container  1  is completed. 
     As shown in part (a) of  FIG.  13   , when the developer supply container  1  is moved in the mounting direction A, the engaged portion  11   b  of the developer receiving portion  11  is contacted to the lower side portion of the first engaging surface  31   a  of the engaging portion  30  of the developer supply container  1 . At this time, as shown in part (a) of  FIG.  15   , the developer receiving portion  11  does not yet move in the upward direction U approaching the developer supply container  1 , and the developer supply container  1  and the main assembly seal  13  are not in contact with each other. For this reason, the thickness of the main assembly seal  13  remains 3.0 mm. In addition, as shown in part (a) of  FIG.  9   , in the shutter  4 , the stopper portions  4   b  and  4   c  are engaged with the shutter stopper portions  8   a  and  8   b  of the developer receiving device  8 , and therefore, the position of the shutter  4  in the mounting direction A is fixed with respect to the developer receiving device  8 . Therefore, even when the developer supply container  1  is further moved in the mounting direction A, the shutter  4  moves relative to the developer supply container  1  except the shutter  4  in the mounting direction A, but it does not move relative to the developer receiving portion  11  in the inserting/removing direction. 
     When the developer supply container  1  is further moved in the mounting direction A, the engaged portion  11   b  of the developer receiving portion  11  is guided by the first engaging surface  31   a , so that the developer receiving portion  11  is lifted upward direction U toward the developer supply container. And, as shown in part (b) of  FIG.  13   , slightly before the engaged portion  11   b  is positioned at the upstream side end portion  31   b , in the mounting direction A, of the first engaging surface  31   a , the upper end surface of the main assembly seal  13  passes by the opening portion  3   e  of the bottom portion  3   d  of the flange portion  3  in the upward direction U, as shown in part (b) of  FIG.  15   . Also, the upper end surface of the main assembly seal  13  abuts to the connecting face  4   k  of the shutter  4  and slightly collapses the main assembly seal until the engaged portion  11   b  is located at the upstream side end portion  31   b , in the mounting direction A, of the first engaging face  31   a   13  in the vertical direction. In this embodiment, when the engaged portion  11   b  is positioned at the upstream side end portion  31   b , in the mounting direction A, of the first engaging surface  31   a , the main assembly seal  13  is collapsed by an amount of 1.0 mm, and therefore, the thickness thereof becomes 2.0 mm. By this, the receiving opening  11   a  and the shutter opening  4   j  communicate with each other. Here, the upstream side end portion  31   b  of the first engaging surface  31   a  in the mounting direction A is provided at the same height as the second engaging surface  32   a . For this reason, the amount by which the main assembly seal  13  is collapsed at this point is the same as the amount to be collapsed when actually supplying the developer after mounting the developer supply container  1 . 
     When the developer supply container  1  is further moved in the mounting direction A, as shown in part (a) of  FIG.  14   , the engaged portion  11   b  of the developer receiving portion  11  is guided by the projecting portion  33  of the third engaging surface  33   a , and the developer receiving portion  11  is raised by a distance L 1  in the upward direction U further toward the developer supply container  1 . And, as shown in part (a) of  FIG.  16   , the main assembly seal  13  is more strongly pressed against the connecting surface  4   k  and is collapsed to a thickness of 1.5 mm with a collapse amount of 1.5 mm. At this time, the shutter opening  4   j  is not in communication with the container discharge opening  3   a   4 , and therefore, the developer is not supplied from the developer supply container  1  to the apparatus main assembly  100   a . As described above, in the process of inserting the developer supply container  1  into the developer receiving device  8 , the developer receiving portion  11  temporarily becomes closer to the developer supply container than in a holding position which is taken at the time of completion of mounting of the developer supply container  1 . By this, it is possible to prevent improper sealing due to partial contact between the main assembly seal  13  and the shutter  4  or due to insufficient lifting of the developer receiving portion  11 . 
     When the developer supply container  1  is further moved in the mounting direction A and the developer supply container  1  is pushed into the mounting completion position, as shown in part (b) of  FIG.  14   , the engaged portion  11   b  of the developer receiving portion  11  rides over the projecting portion  33  of the third engaging surface  33   a  and then is positioned on the second engaging surface  32   a . By this, the developer receiving portion  11  is lowered in the downward direction D by a distance L 1 . And, as shown in part (b) of  FIG.  16   , the main assembly seal  13  weakens the pressing force to the coupling surface  4   k , such that the crush amount becomes back to 1.0 mm, and the thickness is returned to 2.0 mm. In addition, the shutter opening  4   j  and the container discharge opening  3   a   4  communicate with each other, and the developer supply container  1  makes a state in which the developer can be supplied to the apparatus main assembly  100   a . Here, as shown in part (b) of  FIG.  14   , the positional relationship between the container discharge opening  3   a   4  and the second engaging surface  32   a  is such that the plane L passing through the container discharge opening  3   a   4  and perpendicular to the rotation axis P passes through the second engaging surface  32   a . In addition, the plane including the second engaging surface  32   a  is in a positional relationship to be disposed between the rotation axis P and the container discharge opening  3   a   4 . 
     As described in the foregoing, according to the developer supply container  1  of this embodiment, during the process of inserting the developer supply container  1  into the developer receiving device  8 , the developer receiving portion  11  temporarily moves to a position closer to the developer supply container  1  than that in the holding position taken at the completion of mounting of the developer supply container  1 . By this, it is possible to prevent poor sealing due to partial contact between the main assembly seal  13  and the shutter  4  or due to insufficient lifting of the developer receiving portion  11 , thereby to improve the sealing property of the connecting portion between the developer supply container  1  and the developer receiving portion  11 . In addition, a suitable click feeling can be provided when the engaged portion  11   b  rides over the projecting portion  33  when the developer supply container  1  is mounted to or dismounted from the apparatus main assembly  100   a , and therefore, it is possible to easily feel the mounted state of the developer supply container  1 , thus improving operability. 
     Here, in order to improve the sealing property of the connecting portion between the developer supply container  1  and the developer receiving portion  11 , it would be considered that when the mounting of the developer supply container  1  is completed, the main assembly seal  13  is deformed to 1.5 mm with the collapse amount of 1.5 mm. However, in such a case, the compression rate of the main assembly seal  13  is increased in the state the developer supply container  1  is completely mounted, with the result that the reaction force is increased, and a large force is always continuously applied to the engaged portion  11   b . Then, there arises a likelihood that loss of elasticity of the main assembly seal  13  and the deformation of the engaged portion  11   b  may occur, with the result that the sealing property may be deteriorated. 
     On the other hand, according to the developer supply container  1  of this embodiment, although the compression amount of the main assembly seal  13  is temporarily increased, it is returned to the normal compression amount when the mounting of the developer supply container  1  is completed, and therefore, a large load is not continuously applied to the portions such as the main assembly seal  13  and the engaged portion  11   b . For this reason, it is possible to prevent deterioration of the sealing property due to the loss of elasticity of the main assembly seal  13  due to excessive load and deformation of the engaged portion  11   b.    
     Here, in the above embodiment, as shown in  FIG.  8   , the third engaging surface  33   a  of the engaging portion  30  has a surface parallel to the inserting/removing direction of the upper surface of the projecting portion  33 , but it is not limited to this example. For example, as in the first modification shown in part (a) of  FIG.  17   , the projecting portion  33  of the third engaging surface  33   a  may not have a plane parallel to the inserting/removing direction, but has an apex projecting in the upward direction U as seen from a lateral side. The surface continuous to this apex in either of the mounting direction A and the dismounting direction B is also a surface inclined in the downward direction D, by which the developer receiving portion  11  is temporarily moved closer to the developer supply container than in the holding position at the time of completion of mounting of the developer supply container  1 . 
     In addition, in the above-described embodiment, as shown in  FIG.  8   , the parallel portion  32  of the engaging portion  30  is located on the side of the inclined portion  31  in the dismounting direction B, but it is not limited to this example. For example, as in the second modification shown in part (b) of  FIG.  17   , by providing the projecting portion  33  on the upward direction U side of the front end portion, in the mounting direction A, of the parallel portion  32 , the inclined portion  31  and the parallel portion  32  may partially overlap with each other. 
     In addition, in the above embodiment, as shown in  FIG.  8   , the third engaging surface  33   a  is provided on the inclined portion  31 , but this is not restrictive to the present invention. For example, the third engaging surface  33   a  including the projecting portion  33  may be provided on the upper surface of the front end portion of the parallel portion  32  in the mounting direction A as in the third modification shown in part (c) of  FIG.  17   . Or, as in the fourth modification shown in part (a) of  FIG.  18   , the third engaging surface  33   a  including the projecting portion  33  straddles the leading end portion, in the dismounting direction B, of the inclined portion  31  and the leading end portion, in the mounting direction A, of the parallel portion  32 . 
     In addition, in the above embodiment, as shown in  FIG.  8   , in the engaging portion  30 , the inclined portion  31  and the parallel portion  32  are separate members, but it is not limited to this example. For example, as in the fifth modified example shown in part (b) of  FIG.  18   , the inclined portion  31  and the parallel portion  32  may be formed by a single member. In this case, the first engaging surface  31   a , the second engaging surface  32   a , and the third engaging surface  33   a  are integrally molded. Even in this case, the engaging portion  30  may be formed separately from the flange portion  3  and integrated with the flange portion  3  by adhesion or the like, or the engaging portion  30  and the flange portion  3  may be formed integrally by injection molding or the like. 
     In addition, in the above embodiment, as shown in  FIG.  8   , the third engaging surface  33   a  has only one projecting portion  33 , but the present invention is not limited to this example, and the third engaging surface  33   a  may have a plurality of projecting portions. For example, as in the sixth modified example shown in part (c) of  FIG.  18   , the third engaging surface  33   a  may have two projecting portions of the first projecting portion  33  and the second projecting portion  34 . In such a case, the first projecting portion  33  is provided continuously from the leading end, in the dismounting direction B, of the first engaging surface  31   a , and the second projecting portion  34  is provided continuously from the leading end, in the mounting direction A, of the second engaging surface  32   a , and it is disposed with a slight space from the first projecting portion  33 . By this, when the developer supply container  1  is mounted, the engaged portion  11   b  of the developer receiving portion  11  is guided by the projecting portions  33 ,  34  of the third engaging surface  33   a , and the developer receiving portion  11  is intermittently pressed twice against the supply container  1 . By this, it is possible to more effectively prevent seal failure due to partial contact between the main assembly seal  13  and the shutter  4  and insufficient lifting of the developer receiving portion  11 . 
     In addition, in the embodiment described above, the second engaging surface  32   a  is a parallel surface provided substantially in parallel with the mounting direction A, but the present invention is not limited to this example. In this case, the developer receiving device  8  retracting device is provided. By this, the developer supply container  1  is fixed at a predetermined mounting position in a state that it is retracted in the mounting direction by the retracting device, and therefore, the developer supply container  1  does not move in the dismounting direction unless an operator or the like takes out by applying a force. Therefore, even if the second engaging surface  32   a  is not a parallel surface, the engaged portion  11   b  does not unintentionally move in the dismounting direction B. 
     Embodiment 2 
     Next, Embodiment 2 of the present invention will be described in detail referring to  FIG.  19    to part (b) of  FIG.  20   . In Embodiment 1 described above, regardless of the engagement with the engaged portion  11   b , the engaging portion  30  has a shape that does not deform. On the contrary, in the case of this embodiment, the engaging portion  130  is deformed by engagement with the engaged portion  11   b  with the mounting operation of the developer supply container  1 . Other structures and operations are the same as in Embodiment 1 described above, and therefore, the same reference numerals are used for the same components, and the illustration and explanation thereof are omitted or simplified, and the different portions from Embodiment 1 will be mainly described below. 
     In this embodiment, as shown in  FIG.  19    and part (a) of  FIG.  20   , the flange portion  3  is provided with an engaging portion  130  engageable with the engaged portion  11   b  of the developer receiving portion  11 . The engaging portion  130  fixes the base end portion (fixed portion)  130   a  on the mounting direction A side to the flange portion  3 , and the other portion is provided so as to be displaceable relative to the flange portion  3 . And, the engaging portion  130  is, as shown in part (a) of  FIG.  19   , before engaging with the engaged portion  11   b , it is provided in a state the dismounting direction B side is inclined upward in the U direction. The engaging portion  130  has a first engaging surface  131   a , a second engaging surface  132   a , and a contact portion  134   a . The first engaging surface  131   a  has an elastic portion  130   c  capable of displacing at the upper end in the vertical direction and has a shape that faces upward in the vertical direction as it approaches to the developer accommodating portion  2   c . The second engaging surface  132   a  is engaged with the engaged portion  11   b  when the receiving opening  11   a  communicates with the shutter opening  4   j . When the engaged portion  11   b  is engaged with the elastic portion  130   c , the contact portion  134   a  contacts the deformed elastic portion  130   c  to form a path for guiding the engaged portion  11   b  to the second engaging surface  132   a.    
     As shown in part (b) of  FIG.  20   , the engaging portion  130  is elastically deformed by engagement with the engaged portion  11   b  with the mounting operation of the developer supply container  1 . And, the structure is such that the locus  140  of the engaged portion  11   b  when the engaged portion  11   b  relatively moves with respect to the engaging portion  130  by the mounting operation has a first region  141 , a second region  142 , and a third region  143 . The first region  141  of the locus  140  is an upward direction U toward the upstream side, in the mounting direction A, of the developer supply container  1 . The second region  142  of the locus  140  is located on the upstream side, in the mounting direction A, of the first region  141 , and is provided at the same height (position) as the height (position) the upstream side end portion  141   a  in the upward direction U, in the mounting direction A, of the first region  141 . The third region  143  of the locus  140  continuously includes a projecting region  143   a  which projects in the upward direction U beyond the second region  142  to guide the engaged portion  11   b  between the first region  141  and the second region  142 . 
     In addition, in this embodiment, the positioning portion  134  which abuts against the free end portion  130   b  of the elastically deformed engaging portion  130  and positions the free end portion  130   b  is provided on the upstream side of the engaging portion  130  of the flange portion  3  in the mounting direction A. The engaging portion  130  elastically deforms until the free end portion  130   b  abuts against the contact portion  134   a  formed on the mounting direction A side of the positioning portion  134  with the base end portion  130   a  as the base end. As shown in part (b) of  FIG.  20   , the upper surface of the positioning portion  134  is a horizontal surface parallel to the inserting/removing direction, and is continuous with the upper surface of the engaging portion  130  in a state that the free end portion  130   b  is engaged and positioned. 
     As shown in part (a) of  FIG.  20   , when the engaged portion  11   b  and the elastic portion  130   c  are not engaged with each other, the elastic portion  130   c  is separated from the contact portion  134   a . The engaging portion  130  is elastically deformed by engagement with the engaged portion  11   b  with the mounting operation of the developer supply container  1 . And, finally, as shown in part (b) of  FIG.  20   , the locus  140  of the engaged portion  11   b  becomes having the first region  141 , the second region  142 , and the third region  143 . That is, when the elastic portion  130   c  contacts the contact portion  134   a , the height of a portion of the elastic portion  130   c  in the vertical direction is higher than the height of the second engaging surface  132   a . In the engaging portion  130 , the rigidity of each portion is selected such that the locus  140  of the engaged portion  11   b  finally becomes such a locus. For example, by making the end portion  130   b  side lower than the base end portion  130   a  side of the engaging portion  130 , the deformed portion  11   b  hardly deforms until the engaged portion  11   b  reaches the free end side, and the engaged portion  11   b  suddenly moves toward the free end side after it reaches the free end portion. By doing so, the locus  140  of the engaged portion  11   b  as shown in part (b) of  FIG.  20    can be accomplished. 
     Here, as shown in part (b) of  FIG.  20   , in a state after completion of mounting of the developer supply container  1 , the engaging portion  130  has the first engaging surface  131   a , the second engaging surface  132   a , and the third engaging surface  133   a . The locus along which the engaged portion  11   b  guided by the first engaging surface  131   a  passes forms the first region  141  of the locus  140 . The locus along which the engaged portion  11   b  guided by the third engaging surface  133   a  passes forms the third region  143  of the locus  140 . The locus along which the engaged portion  11   b  guided by the second engaging surface  132   a  passes forms the second region  142  of the locus  140 . The shapes and operations of the engaging surfaces  131   a ,  132   a , and  133   a  are the same as in Embodiment 1. 
     The description will be made as to the deformation of the engaging portion  130  with the mounting operation of the developer supply container  1  to the developer receiving device  8 , referring to parts (a) and (b) of  FIG.  20   . When starting mounting of the developer supply container  1 , as shown in part (a) of  FIG.  20   , the engaged portion  11   b  approaches to the neighborhood of the base end portion  130   a  of the engaging portion  130 . At this time, the engaged portion  11   b  is not engaged with the engaging portion  130 , and therefore, the engaging portion  130  is not deformed. 
     Next, when the developer supply container  1  is further inserted in the mounting direction A, the engaged portion  11   b  and the engaging portion  130  are engaged with each other, so that the engaged portion  11   b  is displaced in the direction U by the engagement with the engaging portion  130 , and the movement is along the first region  141  of the locus  140 . And, as shown in part (b) of  FIG.  20   , when the engaged portion  11   b  reaches the upstream side end portion  141   a , in the mounting direction A, of the first region  141 , the engaged portion  11   b  is further displaced in the upward direction U, and the movement is along the third region  143  of the locus  140  Moving. At this time, the developer receiving portion  11  is temporarily brought into close proximity temporarily beyond the holding position which is taken at the completion of mounting of the developer supply container  1 . By this, it is possible to prevent insufficient sealing due to partial contact between the main assembly seal  13  and the shutter  4  or insufficient lifting of the developer receiving portion  11 . Also, when the engaged portion  11   b  reaches from the third region  143  to the second region  142 , the developer receiving portion  11  is positioned at the holding position at the completion of mounting of the developer supply container  1 . 
     As described in the foregoing, also in the developer supply container  1  of this embodiment, during the process of inserting the developer supply container  1  into the developer receiving device  8 , the developer receiving portion  11  temporarily made closer to the developer supply container beyond the holding position which is taken at the time of the completion of mounting of the developer supply container  1 . By this, it is possible to prevent insufficient sealing due to partial contact between the main assembly seal  13  and the shutter  4  or insufficient lift of the developer receiving portion  11  to improve the sealing property of the connecting portion between the developer supply container  1  and the developer receiving portion  11 . 
     Here, in the above embodiment, as shown in part (b) of  FIG.  20   , the engaging portion  130  has the first engaging surface  131   a , the second engaging surface  132   a , and the third engaging surface  133   a , but the present invention is not limited to this example. For example, the engaging portion  130  may have the first engaging surface  131   a  and the third engaging surface  133   a  and the positioning portion  134  may have the second engaging surface  132   a . In this case, the horizontal upper surface of the positioning portion  134  becomes the second engaging surface  132   a , and the contact portion  134   a , for example is integrally molded with the second engaging surface  132   a . In addition, there is also a case the engaging portion  130  returns to its original position by being guided by the engaged portion  11   b  to the upper surface of the positioning portion  134 . In such a case, by moving the developer supply container  1  in the dismounting direction B, the engaged portion  11   b  moves downward D without engaging with the engaging portion  130  from the end on the mounting direction A side of the positioning portion  134 , and the developer receiving portion  11  returns to its original position by the urging force of the urging member  12 . 
     Other Embodiments 
     In the above description, the discharge opening with which the receiving opening  11   a  of the developer receiving portion  11  communicates is the shutter opening  4   j  of the shutter  4 , but instead of providing the shutter, the developer receiving portion may be brought into direct contact with the container discharge opening of the developer supply container  1  to communicate therewith. In this case, the container discharge opening corresponds to the discharge opening communicating with the receiving port. 
     INDUSTRIAL APPLICABILITY 
     According to the present invention, there is provided a developer supply container and a developer supplying device and a developer supplying system in which the sealing property of the connecting portion between the developer supplying container and the developer receiving portion is improved. 
     DESCRIPTION OF SYMBOLS 
       1  developer supply container:  2   c  developer casing portion:  4   j  shutter opening (discharge port):  8  developer receiving device:  11  developer receiving portion:  11   a  receiving opening:  11   b  engaged portion:  12  urging member (urging portion):  13  main assembly seal (seal portion):  30  engagement portion:  31   a  first engaging surface:  31   b  upstream side end portion, in the mounting direction, of the first engaging surface:  32   a  second engaging surface:  33  projecting portion:  33   a  third engaging surface:  130  engaging portion:  130   a  securing portion:  130   b  free end portion:  130   c  resilient portion:  134   a  abutting portion:  140  locus:  141  first region:  142  second region:  143  third region:  143   a  projecting region:  200  developer supply system:  300  discharge portion: A mounting direction: U upward direction (displacing direction).