Patent Publication Number: US-2021179376-A1

Title: Conveying apparatus and printing apparatus

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     The present application claims priority from Japanese Patent Application No. 2019-226742, filed on Dec. 16, 2019, the disclosure of which is incorporated herein by reference in its entirety. 
     BACKGROUND 
     Field of the Invention 
     The present disclosure relates to a conveying apparatus which conveys a continuous sheet wound in a roll, and a printing apparatus which is provided with the conveying apparatus and which performs printing on the sheet. 
     Description of the Related Art 
     There is known a conveying apparatus in which a roll body (a roll of a continuous sheet) which is a sheet (a continuous sheet) wound in a roll is arranged inside of the conveying apparatus and which conveys the sheet in the inside of the conveying apparatus. For example, Japanese Patent Application Laid-open No. 2000-355448 discloses an image forming apparatus in which a roll body is arranged in the inside of a casing of the image forming apparatus and which performs printing on a sheet that is drawn from the roll body and is conveyed. Japanese Patent Application Laid-open No. H07-215548 corresponding to U.S. Pat. No. 5,717,495 discloses a facsimile apparatus having a similar configuration to that of the above-described image forming apparatus. 
     In the conveying apparatus (the image forming apparatus and the facsimile apparatus) disclosed in Japanese Patent Application Laid-open No. 2000-355448 and Japanese Patent Application Laid-open No. H07-215548 corresponding to U.S. Pat. No. 5,717,495, in a case that the roll body is replaced or exchanged, the roll body is detached and attached with respect to the casing, along a radial direction of the roll body. 
     In the inside of the casing of the conveying apparatus having the above-described configuration, a space for allowing the roll body to pass is required in the radial direction of the roll body in a case that the roll body is to be exchanged. In such a conveying apparatus, there is such a fear that the roll body and a part might interfere with each other in the case that the roll body is exchanged. Accordingly, it is not possible to arrange any part in the space for allowing the roll body to pass therethrough. Therefore, since a part required for the apparatus cannot be arranged in the vicinity of a space in which the roll body is installed, it is not possible to make the size of the apparatus to be small. Accordingly, the part cannot be arranged at a reasonable location or position due to the space required for allowing the roll body to pass therethrough, which in turn leads to any increase in the size of the apparatus. 
     The present disclosure has been made in view of the above-described circumstance, and an object of the present disclosure is to provide a conveying apparatus capable of realizing a compact or small-sized casing while securing a space required for attaching/detaching the roll body. 
     SUMMARY 
     According to a first aspect of the present disclosure, there is provided a conveying apparatus including: 
     a casing; 
     a motor; 
     a supporting part positioned in the casing; 
     a first shaft supported by the supporting part; 
     a rotary body configured to rotate about an axis of the first shaft; 
     a driving transmitting part configured to transmit a driving force from the motor to the rotary body; 
     a holder configured to support a roll of a continuous sheet in which a continuous sheet is wound, configured to be detachably attached to the first shaft, and configured to rotate about the axis of the first shaft; 
     a rotation transmitting part configured to transmit rotation of the rotary body to the holder; and 
     a conveyor positioned in the casing and configured to convey the continuous sheet,
         wherein the holder includes:
           a second shaft configured to be inserted into the roll of the continuous sheet, and   a joint positioned on one end of the second shaft, configured to move along the axis of the first shaft, and configured to attach the second shaft to the first shaft detachably such that the second shaft is coaxially with the first shaft; and   
               

     in an attached state in which the second shaft is attached to the first shaft, the rotation transmitting part connects the second shaft to the first shaft or the rotary body so as to transmit the rotation of the rotary body to the second shaft. 
     According to a second aspect of the present disclosure, there is provided a printing apparatus including: 
     the conveying apparatus as defined in the first aspect; and 
     a printing part configured to perform printing on the continuous sheet conveyed by the conveyor. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view depicting the outer appearance of an image recording apparatus according to an embodiment of the present disclosure. 
         FIG. 2  is a vertical cross-sectional view depicting a II-II cross-section of  FIG. 1 . 
         FIG. 3A  is a rear view of a supporting mechanism, and  FIG. 3B  is a right side view of the supporting mechanism. 
         FIG. 4  is a perspective view of the supporting mechanism, an install part and a holder as seen from a left rear side thereof. 
         FIG. 5  is a perspective view of the supporting mechanism, the install part and the holder as seen from a right rear side thereof. 
         FIG. 6  is a vertical cross-sectional view depicting a VI-VI cross-section of  FIG. 5 . 
         FIG. 7  is a rear view of the supporting mechanism, the install part and the holder. 
         FIG. 8  is a perspective view of the holder. 
         FIG. 9  is a vertical cross-sectional view depicting a IX-IX cross-section of  FIG. 4 . 
         FIG. 10  is a vertical cross-sectional view depicting a X-X cross-section of  FIG. 7 . 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     An image recording apparatus  100  according to an embodiment of the present disclosure will be explained below. Note that an embodiment which is to be explained below is merely an example of the present disclosure; it is needless to say that the embodiment can be appropriately changed within a range not changing the gist of the present disclosure. Further, in the following explanation, advancement or movement (progress) directed from a starting point to an end point of an arrow is expressed as an “orientation”, and going forth and back on a line connecting the starting point and the end point of the arrow is expressed as a “direction”. Further, in the following description, an up-down direction  7  is defined, with a state in which the image recording apparatus  100  is usably or operably installed (the state of  FIG. 1 ) as the reference; a front-rear direction  8  is defined, with a side on which a discharge port  33  is provided being defined as a front side (front surface); and a left-right direction  9  is defined, with the printing apparatus  100  as seen from the front side (front surface). The up-down direction  7 , the front-rear direction  8 , and the left-right direction  9  are orthogonal to each other. 
     &lt;Configuration of Outer Appearance of Image Recording Apparatus  100 &gt; 
     The image recording apparatus  100  (an example of a “conveying apparatus” and a “printing apparatus”) as depicted in  FIG. 1  records, in the ink-jet recording system, an image on a sheet S forming a roll body (a roll of a continuous sheet)  37  (see  FIG. 2 ). 
     As depicted in  FIG. 1 , the image recording apparatus  100  includes a casing  30 . The casing  30  has a substantially rectangular parallelepiped shape and has a size placeable or arrangeable on a table or desk. That is, the image recording apparatus  100  is suitable for use by being placed on the table or desk. Of course, the image recording apparatus  100  may be used while being placed on a floor surface or a rack. 
     The casing  30  has a right surface  30 R and a left surface  30 L, an upper surface  30 U and a lower surface  30 D, and a front surface  30 F and a rear surface  30 B. With this, an internal space  30 A (see  FIG. 2 ) of the casing  30  is partitioned from the outside. The right surface  30 R and the left surface  30 L are located away from each other in the left-right direction  9 . The upper surface  30 U connects an upper end of the right surface  30 R and an upper end of the left surface  30 L. The lower surface  30 D connects a lower end of the right surface  30 R and a lower end of the left surface  30 L. The front surface  30 F and the rear surface  30 B are located apart from each other in the front-rear direction  8 . 
     As depicted in  FIG. 1 , a slit-shaped discharge port  33  which is long in the left-right direction  9  is formed in the front surface  30 F of the casing  30 . A sheet S (see  FIG. 2 ), on which the image recording has been performed is discharged from the discharge port  33 . 
     An operation panel  44  is provided on the front surface  30 F of the casing  30 . A user performs, via the operation panel  44 , input for operating the image recording apparatus  100  and/or input for confirming a variety of kinds of settings. 
     &lt;Internal Configuration of Image Recording Apparatus  100 &gt; 
     As depicted in  FIG. 2 , respective constitutive elements, of the image recording apparatus  100 , such as a holder  35 , a tensioner  45 , a conveying roller pair  36 , a conveying roller pair  40 , a conveying belt  101 , a head  38  (an example of a “printing part”), a fixing part  39 , a supporting member  46 , a CIS  16 , a cutter unit  26 , a tank  34 , etc., are arranged in the internal space  30 A. The conveying roller pair  36 , the conveying roller pair  40 , and conveyor belt  101  are an example of a “conveyor”. 
     A partition wall  41  is provided in the internal space  30 A. The partition wall  41  partitions a rear lower part of the internal space  30 A so as to define a sheet accommodating space  30 C. The sheet accommodating space  30 C is a space which is surrounded by the partition wall  41  and the casing  30  (specifically, the rear surface  30 B, the lower surface  30 D, the right surface  30 R, and the left surface  30 L) and which is isolated from the head  38 , etc. 
     The sheet accommodating space  30 C accommodates a roll body  37 , a holder  35  supporting the roll body  37 , and an install part  60  (see  FIG. 4 ) in which the holder  35  is installed. The install part  60  is installed (see  FIG. 4 ) in a supporting mechanism  80  (see  FIG. 3 ) which is arranged in the sheet accommodating space  30 C. With this, the roll body  37 , the holder  35  and the install part  60  are positioned in the sheet accommodating space  30 C. 
     The roll body (the roll of the continuous sheet)  37  has a core tube  19  (see  FIG. 4 ) and a sheet S (a continuous sheet S) which is continuous and long. The sheet S is wound around the core tube  19  in a roll shape in the circumferential direction of the axial core of the core tube  19 . Note that in  FIG. 4 , only the core tube  19  of the roll body  37  is depicted, and the sheet S is not depicted. The core tube  19  is installed in the holder  35 , to thereby allow the roll body  37  to be supported by the holder  35 . Note that it is allowable that the roll body  37  does not have the core tube  19 , and that the sheet S is wound in a roll shape so that the sheet is installable in the holder  35 . The holder  35 , the install part  60  and the supporting mechanism  80  will be explained in detail later on. 
     As depicted in  FIG. 1 , a right cover  29  is positioned in the right surface  30 R of the casing  30 . In a case that the right cover  29  is opened, the holder  35 , etc., positioned in the inside of the sheet accommodating space  30 C is exposed thereby, via an opening  32  formed in the right surface  30 R of the casing  30 . In a case that the right cover  29  is closed, the holder  35 , etc., positioned in the inside of the sheet accommodating space  30 C is shielded thereby. Note that in  FIG. 1 , although the casing  30  is opened/closed by the rotation of the right cover  29 , it is allowable that the casing  30  is opened/closed by, for example, sliding of the right cover  29 , rather than the rotation of the right cover  29 . 
     As depicted in  FIG. 2 , the sheet accommodating space  30 C is opened upward at a rear part of the sheet accommodating space  30 C. More specifically, a gap  42  is defined between the partition wall  41  and the rear surface  30 B, that is, at a location above a rear end of the roll body  37 . In a case that the conveying roller pairs  36  and  40  are rotated, the sheet S is thereby drawn upward from the rear end of the roll body  37  and is guided to the tensioner  45  via the gap  42 . 
     The tensioner  45  is positioned in the rear part of the internal space  30 A, at a location above the partition wall  41 . The tensioner  45  has a rotatable roller, and a rearward biasing force is applied to the roller by a biasing member such as a spring, etc. The roller of the tensioner  45  has an outer circumferential surface  45 A facing the outside of the casing  30 . The outer circumferential surface  45 A has a size which is not less than the maximum width of the sheet S in the left-right direction  9 . An upper end of the outer circumferential surface  45 A is at a position which is substantially same, in the up-down direction  7 , as a nip D of the conveying roller pair  36 . 
     The sheet S pulled out from the roll body  37  is put or placed on and makes contact with the outer circumferential surface  45 A. The sheet S is curved forward along the outer circumferential surface  45 A, extends in a conveying orientation  8 A, and is guided to the conveying roller pair  36 . The conveying orientation  8 A is a forward orientation along the front-rear direction  8 . The tensioner  45  imparts a tension to the sheet S in a well-known method. 
     Note that the tensioner  45  is not limited to or restricted by the configuration depicted in  FIG. 2 , namely the configuration which imparts the rearward biasing force to the roller by a biasing member such as a spring, etc.; it is allowable to apply other well-known technique to the tensioner  45 . 
     The conveying roller pair  36  is positioned in front of the tensioner  45 . The conveying roller pair  36  has a conveying roller  36 A and a pinch roller  36 B. The conveying roller  36 A and the pinch roller  36 B make contact with each other at a position in the up-down direction  7  which is substantially same as the upper end of the outer circumferential surface  45 A, to thereby form the nip D. 
     The conveying roller pair  40  is positioned in front of the conveying roller pair  36 . The conveying roller pair  40  has a conveying roller  40 A and a pinch roller  40 B. The conveying roller  40 A and the pinch roller  40 B make contact with each other at a position in the up-down direction  7  which is substantially same as the upper end of the outer circumferential surface  45 A, to thereby form a nip. 
     The conveying rollers  36 A and  40 A rotate by the driving force transmitted thereto from a motor  104  (see  FIG. 3 ). The conveying roller pair  36  rotates while nipping the sheet S extending in the conveying orientation  8 A from the tensioner  45 , to thereby feed out the sheet S in the conveying orientation  8 A along a conveying surface  43 A. The conveying roller pair  40  rotates while nipping the sheet S fed from the conveying roller pair  36 , to thereby feed out the sheet S in the conveying orientation  8 A. Further, by the rotations of the conveying roller pairs  36  and  40 , the sheet S is drawn from the sheet accommodating space  30 C, passing the gap  42 , toward the tensioner  45 . 
     As depicted in  FIG. 2 , a conveyance path  43  extending from the upper end of the outer circumferential surface  45 A of the tensioner  45  and arriving at the discharge port  33  is formed in the internal space  30 A. The conveyance path  43  extends substantially linearly along the conveying orientation  8 A, and is a space in which the sheet S can pass. Specifically, the conveyance path  43  is along a conveying surface  43 A which spreads in the conveying orientation  8 A and in the left-right direction  9  and which is long in the conveying orientation  8 A. Note that in  FIG. 2 , the conveying surface  43 A is indicated by a two-dot chain line indicating the conveyance path  43 . The conveyance path  43  is defined by non-illustrated guide members located away from each other in the up-down direction  7  (not depicted in the drawings), the head  38 , the conveying belt  101 , the supporting member  46 , the fixing part  39 , etc. That is, the head  38 , the conveying belt  101 , the supporting member  46 , and the fixing part  39  are positioned along the conveyance path  43 . 
     The conveying belt  101  is positioned at a location below the conveyance path  43  and is positioned on the downstream side in the conveying orientation  8 A with respect to the conveying roller pair  36 . The conveying belt  101  is an endless belt. The conveying belt  101  is stretched between a driving roller  102  and a driven roller  103 . The conveying belt  101  is arranged in the inside of the conveyance path  43  in the left-right direction  9 . The driving roller  102  and the driven roller  103  are rotatably supported by a non-illustrated frame. The driving roller  102  and the driven roller  103  are spaced apart from each other in the front-rear direction  8  (conveying orientation  8 A). The driving roller  102  is rotated by a driving force transmitted thereto from the motor  104  (see  FIG. 3 ). The driven roller  103  rotates accompanying with the rotation of the driving roller  102 . Thus, the conveying belt  101  conveys the sheet S which is supported thereby in the conveying orientation  8 A. 
     The head  38  is positioned or located at the downstream side in the conveyance orientation  8 A with respect to the conveying roller pair  36 . The head  38  is positioned at a location above the conveyance path  43 . Namely, the head  38  faces or is opposite to the conveyance path  43  in the up-down direction  7 . Further, the head  38  faces the conveying belt  101 , with the conveyance path  43  being interposed therebetween. The head  38  has a plurality of nozzles  38 A. From the plurality of nozzles  38 A, an ink is discharged or ejected downward toward the sheet S supported by the conveying belt  101 . As a result, an image is recorded on the sheet S. 
     The fixing part  39  is positioned at a location above the conveyance path  43 . Further, the fixing part  39  is positioned on the downstream side in the conveying orientation  8 A with respect to the head  38  and is positioned on the upstream side in the conveying orientation  8 A with respect to the conveying roller pair  40 . The fixing part  39  is a UV radiator (ultraviolet light radiator) having a substantially rectangular parallelepiped shape which is elongated in the left-right direction  9 . The fixing part  39  has a casing  39 A. An opening  39 B extending along the left-right direction  9  is formed in a lower wall of the casing  39 A. The fixing part  39  radiates an ultraviolet light through the opening  39 B onto the sheet S and/or the ink on the sheet S passing immediately below the opening  39 B. In the present embodiment, the ink contains a resin which is cured by the ultraviolet light. Therefore, the ink irradiated with the ultraviolet light is fixed to the sheet S. 
     Note that the fixing part  39  is not limited to being the UV irradiator. For example, the fixing part  39  may be a halogen heater having a substantially rectangular parallelepiped shape which is elongated in the left-right direction  9 . In such a case, the fixing part  39  radiates an infrared light via the opening  39 B and heats the sheet S and/or the ink on the sheet S passing immediately below the opening  39 B. Thus, the ink is fixed on the sheet S. In this case, it is allowable that the ink does not contain a resin which is cured by the ultraviolet light. 
     The supporting member  46  is positioned below the conveyance path  43 . The supporting member  46  is located on downstream side in the conveying orientation  8 A with respect to the head  38  and the conveying belt  101 . A rear part of the supporting member  46  faces or is opposite to the fixing part  39 . A front part of the supporting member  46  faces the conveying roller  40 A. The supporting member  46  supports the sheet S which has been conveyed in the conveying orientation  8 A by the conveying belt  101 . 
     The CIS (Contact Image Sensor)  16  is positioned at a location above the conveyance path  43 , and is positioned on the downstream side in the conveyance orientation  8 A with respect to the conveying roller pair  40 . In the CIS  16 , a light is emitted from an light source such as an LED; a light reflected by the sheet is collected to a line sensor by a graded index lens; and an electric signal corresponding to the intensity of the reflected light received by the line sensor is outputted. This allows the CIS  16  to read an image of a printed surface of the sheet. The CIS  16  is arranged so that a read-line extends in the left-right direction  9 . 
     The cutter unit  26  is located on the downstream side in the conveying orientation  8 A with respect to the CIS  16 , at a location above the conveyance path  43 . In the cutter unit  26 , a cutter  28  is mounted on a cutter carriage  27 . The cutter carriage  27  moves in the conveyance path  43  in the left-right direction  9 , by a non-illustrated belt-driving mechanism, etc. The cutter  28  is positioned so as to cross the conveyance path  43  in the up-down direction  7 ; accompanying with the movement of the cutter carriage  27 , the cutter  28  moves in the conveyance path  43  in the left-right direction  9 . By the movement of the cutter  28 , the sheet S located in the conveyance path  43  is cut along the left-right direction  9 . 
     The tank  34  stores the ink. The ink is a liquid containing a pigment, etc. The ink has a viscosity suitable for uniformly dispersing the pigment. The pigment is a component which serves as the color of the ink, namely, is a colorant contained in the ink. The ink is supplied from the tank  34  to the head  38  through a non-illustrated tube. The tank  34  is detachably attachable (attachable/detachable) with respect to the casing  30 , via an openable/closable front cover  13  (see  FIG. 1 ) provided on the front surface  30 F of the casing  30 . Note that the tank  34  may be fixed to the casing  30 . 
     &lt;Supporting Mechanism  80 &gt; 
     The supporting mechanism  80  supports the holder  35 . In the present embodiment, as depicted in  FIGS. 4 and 5 , the holder  35  installed in the install part  60  is supported by the supporting mechanism  80 . The supporting mechanism  80  depicted in  FIG. 3  is arranged in the sheet accommodating space  30 C (see  FIG. 2 ). As depicted in  FIG. 3 , the supporting mechanism  80  is provided with a frame  81  (an example of a “supporting part”), a shaft  82  (an example of a “first shaft”) and a gear  83  (an example of a “rotary body”). 
     As depicted in  FIG. 3 , the frame  81  is constructed of a bottom plate  81 A and a side plate  81 B. The bottom plate  81 A spreads in the front-rear direction  8  and the left-right direction  9 , and is fixed to a bottom surface  31  (see  FIG. 2 ) of the casing  30 . The side plate  81 B spreads in the up-down direction  7  and the front-rear direction  8 , and is provided to stand upward from a left end part of the bottom plate  81 A. The side plate  81 B faces or is opposite to the opening  32  (see  FIG. 1 ) in the left-right direction  9 . Namely, the bottom plate  81 A is positioned, in the left-right direction  9 , between the side plate  81 B and the opening  32 . In the present embodiment, although the bottom plate  81 A and the side plate  81 B are integrally formed, it is allowable that the bottom plate  81 A and the side plate  81 B are formed as separate bodies, respectively, and are connected to each other by, for example, a screw, etc. 
     As depicted in  FIG. 6 , the bottom plate  81 A has a shape of a box of which lower part is opened, and has a space  81 C. Further, the bottom plate  81 A is reinforced by a plurality of ribs  81 D. Furthermore, there is provided a lower plate  81 E which connects two ribs  81 D, among the four ribs  81 D, to each other. Moreover, an opening  84  is formed in the bottom plate  81 A. A part of the opening  84  faces or is opposite to the lower plate  81 E in the up-down direction  7 , via the space  81 C. As depicted in  FIG. 3A , the opening  84 A is formed at a right part of the bottom plate  81 A, namely, the opening  84 A is formed at a part, of the bottom plate  81 A, which is on a side of the opening  32 . As depicted in  FIG. 3B , the opening  84  is formed at a central part in the front-rear direction  8  of the bottom plate  81 A. As depicted in  FIG. 6 , a moving member  85  and a coil spring  86  are arranged in the space  81 C. 
     As depicted in  FIGS. 5 and 6 , the moving member  85  is constructed of a bottom part  85 A, and a projected part  85 B which is projected upward from the bottom part  85 A. The entirety of the bottom part  85 A is arranged in the space  81 C. A lower part of the projected part  85 B is arranged in the space  81 C, and an upper part of the projected part  85 B is projected to the outside of the space  81 C via the opening  84 , namely projected upward from the bottom plate  81 A. As depicted in  FIG. 3A  and  FIG. 5 , the projected part  85 B is provided with an inclined surface  85 C at a part, of the projected part  85 B, which is on the right side and projected upward from the bottom plate  81 A. The inclined surface  85 C is a surface which inclined further upward as further toward the left side. In other words, the projected part  85 B is provided with the inclined surface  85 C on a side thereof facing the opening  32 . The inclined surface  85 C is a surface which inclined further toward the upper surface  30 U as further away from the opening  32 . In an install state in which the install part  60  is installed in the supporting mechanism  80 , the projected part  85 B engages with an opening  71  (to be described later on) of the install part  60 . 
     As depicted in  FIG. 6 , the moving member  85  is provided with a projected part  85 D on the left side of the moving member  85 . Namely, the moving member  85  is provided with the projected part  85 D at a side thereof facing the side plate  81 B. The projected part  85 D is projected leftward farther than flat parts  85 E which are located on the both sides in the front-rear direction  8  of the projected part  85 D. The projected part  85 D straddles (spans) over the bottom part  85 A and the projected part  85 B, and extends in the up-down direction  7 . The flat parts  85 E are present only in the bottom part  85 A. As described above, in the install state in which that install part  60  is installed in the supporting mechanism  80 , the projected part  85 B engages with the opening  71  (to be described later on) formed in the right side plate  63  of the install part  60 . In this situation, the projected part  85 D projects to the left side of the right side plate  63 , via the opening  71 . In this situation, the flat parts  85 E make contact with a pair of projected parts  63 D (to be described later on) of the install part  63  from the right side. 
     An upper end of the coil spring  86  is connected to the bottom part  85 A, and a lower end of the coil spring  86  is connected to the lower plate  81 E. With this, the moving member  85  is movable upward and downward (in the up-down direction  7 ). Note that since the bottom part  85 A is greater than the opening  84 , an upward movement of the moving member  85  is restricted at a position at which the bottom plate  85 A makes contact with the bottom plate  81 A from therebelow. 
     As depicted in  FIG. 3B , the bottom plate  81 A is provided with a pair of projected parts  87 A and  87 B which are projected upward. As depicted in  FIG. 3B , the pair of projected parts  87 A and  87 B face each other in the front-rear direction  8 . The projected part  87 A is positioned in front of (at the front side of) the opening  84 . The projected part  87 B is positioned behind (at the rear side of) the opening  84 . As depicted in  FIG. 3A , the pair of projected parts  87 A and  87 B are positioned on the left side of the opening  84  in the right part of the bottom plate  81 A. As depicted in  FIG. 3B , the pair of projected parts  87 A and  87 B have through holes  88 , respectively, each of which penetrate through one of the pair of projected parts  87 A and  87 B in the left-right direction  9 . 
     As depicted in  FIG. 4 , the side plate  81 B includes, at an upper end part thereof, a bent plate  81 F which is bent to the left side. The bent plate  81 F includes two ribs  89 A and  89 B which have a plate shape and which stand upward and extend in the front-rear direction  8 . The rib  89 A is positioned on the right side of the rib  89 B. The two ribs  89 A and  89 B include through holes  90  which penetrate through the ribs  89 A and  89 B, respectively, in the left-right direction  9 . The through hole  90  of the rib  89 A and the through hole  90  of the rib  89 B are positioned on a straight line extending in the left-right direction  9 . Namely, the through hole  90 A of the rib  89 A and the through hole  90 A of the rib  89 B face each other in the left-right direction  9 . 
     As depicted in  FIG. 3B , the side plate  81 B has a cutout  91  formed by performing cutting downward from an upper end of the side plate  81 B. The cutout  91  is positioned on the right side of the rib  89 A. 
     As depicted in  FIG. 4 , the side plate  81 B includes, at a lower part thereof, a pair of through holes  92 A and  92 B and a through hole  93 . The pair of through holes  92 A and  92 B face each other in the front-rear direction  8 . The through hole  92 A is positioned in front of the through holes  90 . The through hole  92 B is positioned behind the through holes  90 . The pair of through holes  92 A and  92 B are long in a vertical direction (length thereof in the up-down direction  7  is longer than length thereof in the front-rear direction  8 ). The through hole  93  is positioned immediately below the through holes  90 . The through hole  93  is positioned below (on the lower side) of the pair of through holes  92 A and  92 B. The through hole  93  is long in a lateral direction (length thereof in the front-rear direction  8  is longer than length thereof in the up-down direction  7 ). 
     The shaft  82  is supported by the bent plate  81 F in a state that the shaft  82  penetrates through the through holes  90  of the ribs  89 A and  89 B. The shaft  82  is fixed to the bent plate  81 F. The shaft  82  extends in the left-right direction  8 . Namely, the axial direction of the shaft  82  is the left-right direction  9 . 
     The gear  83  is supported by the shaft  82  so that the gear  83  is rotatable about an axis  82 A of the shaft  82 . The axis  82 A is a line extending in the axial direction of the shaft  82  (left-right direction  9 ), and passing the center of a cross section of the shaft  82  (cross section cutting the shaft  82  by a plane orthogonal to the left-right direction  9 ). 
     The gear  83  is positioned on the right side of the rib  89 A, and a lower part of the gear  83  enters into the cutout  91  (see  FIG. 3B ). 
     As depicted in  FIGS. 3B and 4 , the gear  83  includes a columnar body  94  (an example of an “engaged part”; an example of a “second engaging part”) in the inside in the radial direction of the gear  83 . The columnar body  94  has a columnar shape, and is arranged such that the axial direction of the column is the left-right direction  9 . The columnar body  94  is rotatable integrally with the gear  83  about the axis  82 A. As depicted in  FIG. 3B , the columnar body  94  has a circular-shaped through hole  96  penetrating through the columnar body  94  in the left-right direction  9 , and a plurality of cutouts  95  (an example of the “engaged part”; an example of the “second engaging part”) formed to extend radially from an inner circumferential surface of the through hole  96  (outer edge of the through hole  96 ). The shaft  82  is inserted into a central part of the through hole  96 . The diameter of the through hole  96  is greater than the diameter of the shaft  82 . Thus, there is a gap between the shaft  82  inserted into the central part of the through hole  96  and the inner circumferential surface of the through hole  96 . A main body  123 A (see  FIG. 8 ) of a joint part  123  (to be described later on) of the holder  35  is insertable into this gap. 
     The plurality of cutouts  95  are formed with a predetermined spacing distance therebetween in a circumferential direction  6  of the columnar body  94 . As depicted in  FIG. 3B , a width in the circumferential direction  6  of each of the plurality of cutouts  95  is the widest at a right end (an end in front of the sheet surface of  FIG. 3B ) of the columnar body  94 , and becomes narrower toward the left side of the columnar body  94  (toward the far side of the sheet surface of  FIG. 3B ). Namely, a spacing distance in the circumferential direction  6  between a pair of surfaces  95 A and  95 B defining each of the plurality of cutouts  95  becomes narrower toward the left side (toward the far side of the sheet surface of  FIG. 3B ). In other words, the spacing distance in the circumferential surface  6  between the pair of surfaces  95 A and  96 B becomes narrower as being away farther from the opening  32  of the casing  30 . The pair of surfaces  95 A and  95 B is an example of a “tapered part”. 
     As depicted in  FIG. 3B , the gear  83  is subjected to driving transmission from the motor  104  via a driving transmitting mechanism (an example of a “driving transmitting part”)  105 , and the gear  83  rotates integrally with the columnar body  94  about the axis  82 A of the shaft  82 . The motor  104  and the driving transmitting mechanism  105  are arranged in the internal space  30 A of the casing  30 . Although the driving transmitting mechanism  105  is constructed of publicly known gear, belt mechanism, etc., the driving transmitting mechanism  105  has at least one gear. Further, the at least one gear meshes with the gear  83 . 
     &lt;Install Part  60 &gt; 
     As depicted in  FIGS. 4 and 5 , the holder  35  is installable in the install part  60 . Further, the install part  60  is installable in the supporting mechanism  80  in the sheet accommodating space  30 C (see  FIG. 2 ) inside the image recording apparatus  100 . Further, the install part  60  is detachable (removable) from the supporting mechanism  80 . The install part  60  detached from the supporting mechanism  80  is removable from the sheet accommodating space  30 C to the outside of the image recording apparatus  100 , via the opening  32 . The installation (attachment) and detachment (removal) of the install part  60  with respect to the supporting mechanism  80  will be described later on. 
     As depicted in  FIGS. 5 and 7 , the install part  60  includes a bottom plate  61 , a left side plate  62 , a right side plate  63  and a bearing (a bearing part)  64 . Further, as depicted in  FIG. 6 , the install part  60  includes a locking mechanism  65  and an interlocking mechanism  66 . 
     As depicted in  FIG. 5 , the bottom plate  61  is a plate spreading in the front-rear direction  8  and the left-right direction  9 . The bottom plate  61  is supported by the bottom plate  81 A of the frame  81  of the supporting mechanism  80  in an install state in which the install part  60  is installed in the supporting mechanism  80  (a state depicted in  FIG. 5 ). 
     As depicted in  FIG. 7 , the left side plate  62  spreads in the front-rear direction  8  and the left-right direction  9 , and is provided to stand upward from a left end part of the bottom plate  61 . 
     As indicated in  FIG. 4  with a broken line, the left side plate  62  has a cutout  67  which is formed to recessed downwards from an upper end thereof. The joint part  123  (see  FIG. 8 ) of the holder  35  (to be described later on) is inserted into the cutout  67 . In this state, a bottom plate  67 A constructing the cutout  67  is capable of supporting the joint part  123 . 
     As depicted in  FIG. 4 , the left side plate  62  has, at a lower part thereof, a pair of projected parts  62 A and  62 B which are projected leftward, and a projected part  62 C which is projected leftward. The pair of projected parts  62 A and  62 B face each other in the front-rear direction  8 . The projected part  62 A is positioned in front of the cutout  67 . The projected part  62 B is positioned behind the cutout  67 . The pair of projected parts  62 A and  62 B are long in the vertical direction (length thereof in the up-down direction  7  is longer than length thereof in the front-rear direction  8 ). The projected part  62 C is positioned immediately below the cutout  67 . The projected part  62 C is positioned below (at a location on the lower side of) the pair of cutouts  62 A and  62 B. The projected part  62 C is long in a lateral direction (length thereof in the front-rear direction  8  is longer than length thereof in the up-down direction  7 ). 
     In the install state in which the install part  60  is installed in the supporting mechanism  80 , the pair of projected parts  62 A and  62 B are inserted into the pair of through holes  92 A and  92 B, respectively, which are provided on the side plate  81 B of the supporting mechanism  80 . Further, in the install state, the projected part  62 C is inserted into the through hole  93  formed in the side plate  81 B of the supporting mechanism  80 . 
     As depicted in  FIGS. 5 and 7 , the right side plate  63  spreads in the front-rear direction  8  and the left-right direction  9 , and formed to stand upright from the right end part of the bottom plate  61 . An upper part of the right side plate  63  has a tapered shape of which length in the front-rear direction  8  becomes shorter further toward the upward direction. Note that the left side plate  62  as described above also has a tapered shape of which length in the front-rear direction  8  becomes shorter further toward the upward direction, similarly to the right side plate  63 . 
     As depicted in  FIGS. 5 and 6 , the right side plate  63  has a cutout  68  which is formed to recessed downwards from an upper end thereof. The bearing  64  is fitted into and is fixed to the cutout  68 . The bearing  64  is a member having a U-shaped part of which upper part is open in a side view along the left-right direction  9 . The inner diameter of this U-shaped part is substantially same as the diameter of the shaft  120  of the holder  35 . Accordingly, the shaft  120  of the holder  35  is fitted into the U-shaped part to thereby allow the bearing  64  to support the shaft  120  to be rotatable. 
     As depicted in  FIGS. 4 and 10 , the right side plate  63  has, at a front part and a rear part in a lower part thereof, a pair of projected parts  63 A which are projected to the left side. The pair of projected parts  63 A are provided with a spacing distance therebetween in the front-rear direction  8 . Note that  FIG. 4  only depicts a projected part  63 A which is included in the pair of projected parts  63 A and which is provided on the rear part of the lower part of the right side plate  63 . As depicted in  FIG. 10 , the pair of projected parts  63 A are inserted into the through holes  88 , respectively, which are formed in the pair of projected parts  87 A and  87 B of the bottom plate  84 A of the supporting mechanism  80 . 
     As depicted in  FIGS. 5 and 6 , the opening  71  is formed in the install part  60 . The opening  71  is formed to span from the right side plate  63  to the bottom plate  61 . In the install state that the install part  61  is installed in the supporting mechanism  80 , the projected part  85 , of the moving member  85  of the supporting mechanism  80 , which is projected upward engages with the opening  71 . In this situation, the projected part  85 D, of the moving member  85 , which is projected leftward, is projected leftward of the right side plate  63  via the opening  71 . Further, the right side plate  63  has a pair of projected parts  63 D projected downward from a lower end of the right side plate  63 . The pair of projected parts  63 D are located on the both side, respectively, in the front-rear direction  8 , of the opening  71  formed in the right side plate  63 . In the install state in which the install part  60  is installed in the supporting mechanism  80 , the pair of projected parts  63  are projected to the space  81 C via the opening  84  formed in the bottom plate  81 A of the supporting mechanism  84 . In the space  81 C, the flat parts  85 E of the moving member  85  of the supporting mechanism  80  make contact with the pair of projected parts  63  from the right side (see  FIG. 6 ). 
     As depicted in  FIG. 5 , the right side plate  63  has a through hole  70 . The through hole  70  penetrates the right side plate  63  in the left-right direction  9 . The through hole  70  is positioned at a location which is below the cutout  68  and which is above the pair of projected parts  87 A and  87 B. 
     As depicted in  FIG. 6 , the install part  60  includes the locking mechanism  65  and the interlocking mechanism  66  on the left side of the right side plate  63 . 
     The locking mechanism  65  includes a rotating piece  65 A and a coil spring  65 B. 
     The rotating piece  65 A is a flat plate-shaped and stick-shaped member. The rotating piece  65 A is supported, by a projection  63 B which is projected form the right side plate  63 , so that the rotating piece  65 A is rotatable in an orientation (direction) of an arrow  69 . The rotating piece  65 A is rotatable between a lock position indicated by a solid line in  FIG. 6  and a non-lock position indicated by a broken line in  FIG. 6 . 
     The rocking piece  65 A includes a projection  65 C at a rotation forward end part thereof, and a projection  65 D provided on a rotation base end part thereof. The projection  65 C is located at a position immediately above the U-shaped part of the bearing  64  in a case that the rotating piece  65 A is at the lock position; and the projection  65 C is located at a position shifted from the position immediately above the U-shaped part of the bearing  64  in a case that the rotating piece  65 A is at the non-lock position. The projection  65 C has inclined surfaces  65 E and  65 F. The inclined surface  65 E is a surface located at a position above the U-shaped part of the bearing  64  and facing the U-shaped part in the up-down direction  7  in a state that the rotating piece  65 A is at the lock position. In the state that the rotating piece  65 A is at the lock position, the inclined surface  65 E is a surface inclined upward further toward the rear side. The inclined surface  65 F is connected to the inclined surface  65 E. In the state that the rotating piece  65 A is at the lock position, the inclined surface  65 F is located at a position above the inclined surface  65 E, and is a surface inclined upward further toward the front side. 
     An end of the coil spring  65 B is connected to the rotating piece  65 A. The other end of the coil spring  65 B is connected to the projected part  63 C provided on the right side plate  63 . The rotating piece  65 A is biased toward the lock position by the coil spring  65 B. 
     The interlocking mechanism  66  is constructed of a plate-shaped member which is long in the up-down direction  7 . The interlocking mechanism  66  is supported by the right side plate  63  to be movable upward and downward (in the up-down direction  7 ). A lower end of the interlocking mechanism  66  makes contact with the projection  85 B of the moving member  85  to thereby allow the interlocking mechanism  66  to be supported by the projection  85 B. With this, the interlocking member  66  is moved upward and downward integrally with the moving member  85 . Normally, the interlocking mechanism  66  is located at an upper position as depicted in  FIG. 6 . In a case that the moving member  85  is moved downward from the position depicted in  FIG. 6 , the interlocking mechanism  66  is moved to a position lower than the position indicated in  FIG. 6  by the self-weight thereof. 
     The interlocking mechanism  66  includes a projected part  66 A which is projected upward from a rear part of the upper end thereof. In a case that the interlocking mechanism  66  is located at the upper position and that the rotating piece  65 A is located at the lock position, the projection  65 D of the rotating piece  65 A makes contact with the projected part  66 A from a position in front thereof. With this, a rotation of the rotating piece  65 A from the lock position toward the non-lock position is restricted or regulated. 
     &lt;Holder  35 &gt; 
     The holder  35  as depicted in  FIGS. 7 to 9  supports the roll body  37 . As depicted in  FIGS. 4 and 5 , the holder  35  is installable in the install part  60 . The holder  35  installed in the install part  60  is supported by the install part  60  to be rotatable. Further, the holder  35  is detachable (removable) from the install part  60 . The installation/detachment of the holder  35  with respect to the install part  60  will be described later on. 
     Note that in the following explanation of the construction of the holder  35 , the up-down direction  7 , the front-rear direction  8  and the left-right direction  9  are defined on such an assumption that the holder  35  is in a state of being installed in the install part  60  and that the install part  60  is in a state of being supported by the supporting mechanism  80  (the state depicted in  FIG. 4 ). 
     As depicted in  FIGS. 7 to 9 , the holder  35  includes a shaft mechanism  51  (see  FIG. 9 ; an example of a “second shaft”), a left flange  52 , a right flange  53  (an example of a “flange” or a “flange part”), and a grasping member  54 . 
     As depicted in  FIG. 9 , the shaft mechanism  51  includes a shaft  120 , a first externally fitting part  121  and a second externally fitting part  122 . 
     The shaft  120  is a stick-shaped member. The shaft  120  extends in the left-right direction  9 . In this state, the shaft  120  is coaxial with the shaft  82  of the supporting mechanism  80 . Namely, an axis  120 A (indicated by a chain line in  FIG. 9 ) of the shaft  120  is on a same straight line with the axis  82 A (indicated by a two-dot chain line in  FIG. 9 ) of the shaft  82 . The axis  120 A is a line extending in the axial direction of the shaft  120 , and passing the center of a cross section (surface orthogonal to the axial direction) of the shaft  120 . 
     The first externally fitting part  121  is a member having a substantially quadrangular prism shape and having an internal space, and is externally fitted to the shaft  120 . The first externally fitting part  121  is fixed to the shaft  120 . 
     A right end of the shaft  120  is projected rightward from the first externally fitting part  121 . The right end part (an example of the “other end of the second shaft”) of the shaft  120  is fitted into the bearing  64  of the install part  60  in a case that the holder  35  is installed in the install part  60  (see  FIG. 5 ). With this, the bearing  64  supports the right end of the shaft  120 . Further, the right end of the shaft  120  is removed (pulled out) from the bearing  64  of the install part  60  in a case that the holder  35  is detached from the install part  60 . Namely, the bearing  64  supports the right end of the shaft  120  to be detachable and attachable (detachably attachable). 
     On the other hand, as depicted in  FIG. 9 , a left end of the shaft  120  is positioned in the internal space of the first externally fitting part  121 . Namely, the left end of the shaft  120  is not projected leftward from the first externally fitting part  121 . 
     As depicted in  FIGS. 8 and 9 , the joint part  123  (an example of a “joint”) is projected leftward from a left end of the first externally fitting part  121 . Namely, the joint part  123  is provided on the left end of the shaft mechanism  51  (an example of a “one end of the second shaft”). The joint part  123  includes a main body  123 A having a circular cylindrical shape, and a rib  123 B (an example of an “engaging part”; and example of a “first engaging part”) which is projected radially from a circumferential surface  123 C of the main body  123 A. Note that the main body  123 A is not limited to having the circular cylindrical shape; it is sufficient that the main body  123 A has a cylindrical shape. 
     An internal space of the main body  123 A is communicated with the internal space of the first externally fitting part  121 . The main body  123 A is coaxial with the shaft  120 . Namely, the axis of the main body  123 A is the axis  120 A of the shaft  120 . The axis of the main body  123 A is a line extending in the left-right direction  9  (a projecting direction of the main body  123 A) and passing the center of a cross section (surface orthogonal to the projecting direction) of the main body  123 A. 
     The rib  123 B is provided as four ribs  123 B with a spacing distance therebetween along the circumferential direction of the external circumferential surface (circumferential surface  123 C) of the main body  123 A. Each of the ribs  123 B extends in the left-right direction on the circumferential surface  123 C. In a state that the holder  35  is installed in the install part  60 , each of the ribs  123 B is engageable with one of the cutouts  95  (see  FIG. 3 ) of the columnar body  94  of the supporting mechanism  80 . Note that the number of the rib  123 B is not limited to being 4 (four). 
     As depicted in  FIGS. 9 and 10 , the second externally fitting part  122  is externally fitted to a right end part of the first externally fitting part  121 . The second externally fitting part  122  is slidable in the left-right direction  9  with respect to the first externally fitting part  121 . The second externally fitting part  122  has a substantially disc shape. 
     The second externally fitting part  122  has, in an outer circumferential surface thereof, three projected parts  124  and one cutout  125 . 
     The three projected parts  124  are provided with a spacing distance therebetween along the circumferential direction of the outer circumferential surface of the second externally fitting part  122 . The spacing distance is substantially same as a length along the circumferential direction of a leaf spring part  128  (to be described later on) of the right flange  53 . As depicted in an enlarged view of  FIG. 10 , each of the three projected parts  124  has a circumferential surface  124 A along the circumferential direction, and an inclined surface  124 B which is continuous from the circumferential surface  124 A and which is inclined, with respect to the circumferential direction, to be directed toward the radial direction of the second externally fitting part  122  (toward a direction toward the shaft  120 ). The circumferential surface  124 A and the inclined surface  124 B construct a part of the outer circumferential surface of the second externally fitting part  122 . The inclined surface  124 B is an example of a “cam surface”. 
     The cutout  125  is formed between two projected parts  124  among the three projected parts  124 . A second projected part  54 C (to be described later on) of the grasping member  54  enters into the cutout  125 . 
     As depicted in  FIG. 8 , the left flange  52  is a disc-shaped member having an opening in a central part thereof. The left flange  52  is externally fitted to a left end part of the first externally fitting part  121 . Specifically, a through hole  126  having a substantially rectangular shape corresponding to a cross-sectional shape of the first externally fitting part  121  is formed in the central part of the left flange  52 ; and the left end part of the first externally fitting part  121  is inserted into the through hole  126 . With this, the left flange  52  is rotatable integrally with the first externally fitting part  121 . Further, the left flange  52  is slidable in the left-right direction  9  with respect to the first externally fitting part  121 . 
     The left flange  52  has a through hole  127  (see  FIG. 4 ) at an end part thereof in the radial direction. The through hole  127  penetrates through the left flange  52  in the left-right direction  9 . Note that in the present embodiment, although the through hole  127  is provided only on the left flange  52 , the through hole  127  may be provided only on the right flange  53 , or may be provided on both of the left flange  52  and the right flange  53 . 
     As depicted in  FIGS. 5 and 10 , the right flange  53  is a disc-shaped member having an opening in a central part thereof. The first externally fitting part  121  of the shaft mechanism  51  and the shaft  120  are inserted into the opening provided on the central part of the right flange  53 . Further, a first projected part  54 B of a grasping member  54  (to be described later on) is also insertable into this opening (see  FIG. 9 ). The right flange  53  is slidable in the left-right direction  9  with respect to the shaft mechanism  51 ; the right flange  53  is detachably attachable (attachable/detachable) with respect to the shaft mechanism  51  by sliding rightward with respect to the shaft mechanism  51 . As depicted in  FIG. 10 , a leaf spring part  128  (an example of a “moving part”) which will be explained below is externally fitted to the second externally fitting part  121  to thereby allow the right flange  53  to be installed in the shaft mechanism  51 . The right flange  53  externally fitted to the second externally fitting part  122  is rotatable about the shaft mechanism  51 . 
     The right flange  53  has three piece of the leaf spring part  128 . As depicted in  FIG. 9 , each of the three leaf spring parts  128  is projected leftward from the left surface of the right flange  53 . The three leaf spring parts  128  extend along the circumferential direction of the right flange  53 , and are provided with a spacing distance therebetween along the circumferential direction. This spacing distance is substantially same as the length along the circumferential direction of each of the three projected parts  124  of the second externally fitting part  122  as described above. 
     Each of the three leaf spring parts  128  is connected to the main body part (disc-shaped part) of the right flange  53 , only at a part, of each of the three leaf spring parts  128 , in the circumferential direction of the right flange  53 . This part is one end part of the both end parts of the leaf spring part  128  in the circumferential direction, and the one end part does nor face the inclined surface  124 B of the projected parts  124  of the second externally fitting part  122 . Each of the three leaf spring parts  128  is flexible in the radial direction of the right flange  53 , with this part as the center of the flexion. 
     Note that the left flange  52  and the right flange  53  are connected to each other by a rack pinion mechanism  129  (see  FIG. 9 ) in a state that the left flange  52  and the right flange  53  are installed in the shaft mechanism  51 . With this, accompanying with a sliding of one of the left flange  52  and the right flange  53  to one of the right side and left side with respect to the shaft mechanism  51 , the other of the left flange  52  and the right flange  53  is slid to the other of the right side and left side with respect to the shaft mechanism  51 . With this, it is possible to easily adjust the distance in the left-right direction  9  between the left flange  52  and the right flange  53 . As a result, the holder  53  is capable of accommodating a plurality of kinds of the roll body  37  having sheets S of which width (length in the left-right direction  9 ) are different from each other, respectively, wound therein. 
     As depicted in  FIG. 5 , the grasping member  54  is a disc-shaped member having an opening in the central part thereof. The first externally fitting part  121  of the shaft mechanism  51  and the shaft  120  are inserted into this opening. Note, however, that concavities and convexities are formed in an outer circumferential surface  54 A of the grasping member  54 . The grasping member  54  includes a first projected part  54 B (see  FIG. 9 ) and a second projected part  54 C (see  FIG. 10 ). The first projected part  54 B is projected leftward from a central part in the left surface (a part surrounding the opening in the central part of the left surface) of the grasping member  54 . The first projected part  54 B is insertable into an opening formed in a central part of the right flange  53 . The second projected part  54 C depicted in  FIG. 10  is projected leftward from the left surface of the first projected part  54 B. As depicted in  FIG. 10 , the second projected part  54 C is insertable into the cutout  125  of the second externally fitting part  122 , and is engageable with the cutout  125 . 
     &lt;Attachment and Detachment of Roll Body  37  with Respect to Holder  35 &gt; 
     In the following, a procedure of attaching/detaching the roll body  37  with respect to the holder  35  will be explained. 
     At first, the right flange  53  of the holder  35  as depicted in  FIG. 8  is detached from the shaft mechanism  51 . Next, the roll body  37  is attached to the shaft mechanism  51  from the right side of the shaft mechanism  51 . In other words, the shaft mechanism  51  is inserted into the roll body  37  with the right end of the shaft mechanism  51  as the leading edge. In this situation, the shaft mechanism  51  is positioned inside the core tube  19  of the roll body  37  (see  FIG. 9 ). 
     Next, as depicted in  FIG. 9 , the right flange  53  is inserted to the shaft mechanism  51  from the right side, and is installed in the shaft mechanism  51 . Specifically, the leaf spring parts  128  provided on the left surface of the right flange  53  are externally fitted to the second externally fitting part  122 . Here, in a state that the right flange  53  is installed in the shaft mechanism  51 , the leaf spring parts  128  are at the same positions, respectively, with the three projected parts  124  of the second externally fitting parts  122 , in the radial direction of the shaft mechanism  51 . Therefore, only in a case that each of the leaf spring parts  128  is located between two projected parts  124 , among the three projected parts  124 , which are adjacent to each other, the right flange  53  is installable in the shaft mechanism  51 . Accordingly, the right flange  53  is inserted into the shaft mechanism  51  while being rotated. Further, at a position at which each of the leaf spring parts  128  is located between the two adjacent projected parts  124 , among the three projected parts  124 , the right flange  53  is installed in the shaft mechanism  51 . Note that the leaf spring parts  128  are positioned inside the core tube  19  of the roll body  37 . Namely, the leaf spring parts  128  are positioned between the second externally fitting part  122  and the inner surface of the core tube  19 . The leaf spring parts  128  make contact with an inner wall surface of the core tube  19  of the roll body  37 . 
     Next, accompanying with the leftward sliding of the right flange  53 , the left flange  52  is slid rightward. With this, the right end and the left end of the roll body  37  make contact with the right flange  53  and the left flange  52 , respectively. Namely, the roll body  37  is positioned in the left-right direction  9 , with the center in the left-right direction  9  as the reference, by the right flange  53  and the left flange  52 , depending on the length in the width direction (left-right direction  9 ) of the roll body  37 . Note that the second externally fitting part  122  slides integrally with the right flange  53 , following the sliding in the left-right direction  9  of the right flange  53 . 
     Next, as depicted in  FIG. 5 , the grasping member  54  is installed in the right flange  53  from the right side of the right flange  53 . Specifically, the first projected part  54 B of the grasping member  54  is inserted into the opening formed in the center of the right flange  53 . Further, the grasping member  54  is inserted into the right flange  53  while being rotated so that the second projected part  54 C of the grasping member  54  is at a position at which the second projected part  54 C is inserted into the cutout  125  of the second externally fitting part  122  (see  FIG. 10 ). 
     Next, the user rotates the grasping member  54 , with respect to the flange  53 , in an orientation of an arrow  130  depicted in  FIG. 5  while holding (grasping) the outer circumferential surface  54 A (see  FIG. 5 ) of the grasping member  54 . By doing so, the second projected part  54 C of the grasping member  54  as depicted in  FIG. 10  rotates counterclockwise in  FIG. 10 , and pushes or presses the projected parts  124  of the second externally fitting part  122 . With this, the second externally fitting part  122  also rotates counterclockwise in  FIG. 10 . Namely, the second externally fitting part  122  rotates relative to the right flange  53 . Then, the inclined surface  124 B of each of the projected parts  124 B makes contact with and pushes (presses) one of the leaf spring parts  128 . This provides a state that each of the leaf spring parts  128  is guided by the inclined surface  124 B and rides on the circumferential surface  124 A. Namely, the state of each of the leaf spring parts  128  is changed from a state indicated by a solid line in the enlarge view of  FIG. 10  to a state indicated by a broken line in the enlarge view of  FIG. 10 . Namely, a part of each of the leaf spring parts  128  is moved to the outside in the radial direction of the shaft mechanism  51  and presses the core tube  19  of the roll body  37  toward the outside in the radial direction. As a result, the position of the roll body  37  installed in the holder  35  is stabilized. 
     The detachment (removal) of the roll body  37  from the holder  35  is executed by a procedure which is substantially reverse to the procedure of installing the roll body  37  in the holder  35 . Namely, at first, the grasping member  54  is rotated in an orientation reverse to that of the arrow  130  depicted in  FIG. 5 . With this, the state of each of the leaf spring parts  128  is changed from the state indicated by the broken line in the enlarge view of  FIG. 10  to the state indicated by the solid line in the enlarge view of  FIG. 10 . Next, the grasping member  54  is detached (removed) from the right flange  53 , and the right flange  53  is detached from the shaft mechanism  51 . Lastly, the roll body  37  is detached from the shaft mechanism  51 . 
     &lt;Attachment (Installation)/Detachment of Holder  35  with Respect to Install Part  60 &gt; 
     In the following, a procedure of installing the holder  35  with respect to the install part  60  will be explained. Note that installation of the holder  35  in the install part  60  is executed at the outside of the image recording apparatus  100 . Namely, before installing the holder  35  in the install part  60 , the install part  60  is detached from the supporting mechanism  80 , and is slid leftward to thereby be pulled out to the outside of the image recording apparatus  100 . Note that a procedure of detaching the install part  60  from the supporting mechanism  80  will be described later on. 
     The user inserts his or her finger into the through hole  127  of the holder  35  to thereby grasp the holder  35 . Further, the grasped holder  35  is installed in the install part  60  from thereabove. Since the holder  35  is provided with the through hole  127 , it is thereby possible to easily lift the holder  35  up and to easily install the holder  35  in the install part  60 . 
     First, an explanation will be given about the state of a right side end of the holder  35  during the installation. In a case that the holder  35  is installed in the install part  60 , the right end of the shaft  120  makes contact with the inclined surface  65 F of the rotating piece  65 A, which is located at the lock position, from thereabove as indicated in the broken line in  FIG. 6 , and pushes or presses the inclined surface  65 F downward. As the right end of the shaft  120  moves downward, the rotating piece  65 A rotates, against the biasing force of the coil spring  65 B, from the lock position indicated by the solid line in  FIG. 6  toward the non-lock position indicated by the broken line in  FIG. 6 . Note that in this situation, since the interlocking mechanism  66  is moved to the lower position by the self-weight thereof, the rotation of the rotating piece  65 A is not regulated by the projected part  66 A of the interlocking mechanism  66 . In a case that the right end of the shaft  120  passes the rotating piece  65 A and is positioned below the rotating piece  65 A, the right end of the shaft  120  is fitted into the U-shaped part of the bearing  64  attached to the right side plate  63 . Note that in a case that the right end of the shaft  120  passes the rotating piece  65 A, the rotating piece  65 A rotates from the non-lock position toward the lock position due to the biasing force of the coil spring  65 B. With this, a location above the right end of the shaft  120  is in a state of being blocked by the rotating piece  65 A (see  FIG. 6 ). 
     Next, an explanation will be given about the state of a left side end of the holder  35  during the installation. In the case of installing the holder  35  in the install part  60 , the joint part  123  (see  FIG. 8 ) of the holder  35  is inserted into the cutout  67  (see  FIG. 4 ) formed in the left side plate  62  of the install part  60 . The joint part  123  makes contact with the bottom surface  67 A (an example of a “temporarily supporting part”; see  FIG. 4 ), which constructs the cutout  67 , from a location above the bottom surface  67 A. With this, the bottom surface  67 A supports the joint part  123  from therebelow. Further, with this, in a process that the install part  60  is installed in the supporting mechanism  80 , the shaft  82  of the supporting mechanism  80  is positioned at a position at which the shaft  80  is insertable into the internal space of the joint part  123 . Note that, as will be described later on, in a case that the install part  60  supporting the holder  35  is further installed in the supporting mechanism  80 , the bottom surface  67 A does not support the joint part  123 . Namely, at this point of time, the bottom surface  67 A supports the joint part  123  temporarily. 
     As described above, both the left and right side ends of the holder  35  are supported by the right side plate  63  and the left side plate  62 , respectively, of the install part  60 , the holder  35  is installed in the install part  60 . 
     The detachment (removal) of the holder  35  from the install part  60  is executed in a procedure as described below. Namely, the user inserts his or her finger into the through hole  127  to thereby grasp the holder  35 . Further, the grasped holder  35  is lifted upward. With this, the right end of the shaft  120  is away (separated away) from the bearing  64 , and the joint part  123  is separated away from the bottom surface  67 A of the cutout  67 , and the holder  35  is removed or detached from the install part  60 . 
     Note that in a case that the right end of the shaft  120  is being separated away from the bearing  64 , the right end of the shaft  120  makes contact with the inclined surface  65 E of the rotating piece  65 A, which is located at the lock position, from therebelow as indicated by the solid line in  FIG. 6  and pushes the inclined surface  65 E of the rotating piece  65 A upward. As the right end of the shaft  120  moves upward, the rotating piece  65 A rotates, against the biasing force of the coil spring  65 B, from the lock position indicated by the solid line in  FIG. 6  toward the non-lock position indicated by the broken line in  FIG. 6 . Note that similarly to the case of installing, since the interlocking mechanism  66  is moved to the lower position by the self-weight thereof, the rotation of the rotating piece  65 F is not regulated by the projected part  66 A of the interlocking mechanism  66 . In a case that the right end of the shaft  120  passes the rotating piece  65 A, is positioned above the rotating piece  65 A and moves out of the bearing  64 , the rotating piece  65 A rotates from the non-lock position to the lock position due to the biasing force of the coil spring  65 B. 
     &lt;Attachment and Detachment of Install Part  60  with Respect to Supporting Mechanism  80 &gt; 
     A procedure of installing the install part  60 , in which the holder  35  is installed, in the supporting mechanism  80  will be explained in the following. Namely, a procedure of installing the install part  60  in the inside of the casing  30  will be explained. 
     The install part  60  is slid from the right side to the left side of the casing  30 , and thus is accommodated in the sheet accommodating space  30 C (see  FIG. 2 ) via the opening  32  (see  FIG. 1 ). In this situation, the install part  60  is inserted into the casing  30  such that the left side plate  62  becomes the leading end of the insertion, and that the right side plate  63  becomes the rear end of the insertion. In this situation, the user inserts his or her finger into the through hole  70  (see  FIG. 5 ) of the install part  60  to thereby grasp the install part  60 . Since the install part  60  has the through hole  70 , it is possible for the user to easily grasp the install part  60 , and to easily slide the install part  60 . 
     The install part  60  is slid leftward on the bottom plate  81 A of the supporting mechanism  80  such that the bottom plate  61  passes between the pair of projected parts  87 A and  87 B (see  FIG. 3B ) which are provided on the bottom plate  81 A. In this situation, the install part  60  is positioned in the up-down direction  7  by being supported by the bottom plate  81 A. Further, in this situation, the front end of the bottom plate  61  of the install part  60  makes contact with a rear surface  79  (see  FIG. 3B ) of the projected part  87 A, and the rear end of the bottom plate  61  of the install part  60  makes contact with a front surface  78  (see  FIG. 3B ) of the projected part  87 B, thereby allowing the install part  60  to be slidable while being positioned in the front-rear direction  8 . 
     As depicted in  FIG. 4 , the left side plate  62  of the install part  60  makes contact with the side plate  81 B of the supporting mechanism  80  from the right side, thereby stopping the leftward slide of the install part  60 . Namely, the install part  60  is installed in the supporting mechanism  80 . 
     In this situation, the pair of projected parts  62 A and  62 B provided on the left side plate  62  of the install part  60  are inserted into and engaged with the pair of through holes  92 A and  92 B, respectively, provided on the side plate  81 B of the supporting mechanism  80 . Further, the pair of projected parts  63 A provided on the right side plate  63  of the install part  60  are inserted into and engaged with the through holes  88  formed in the pair of projected parts  87 A and  87 B, respectively, of the supporting mechanism  80 . Furthermore, in this situation, the projected part  62 C of the install part  60  is inserted into and engaged with the through hole  93  formed in the side plate  81 B of the supporting mechanism  80 . With this, the install part  60  is positioned, with respect to the supporting mechanism  80 , in the front-rear direction  8  and the up-down direction  7 . 
     Moreover, in the case that the install part  60  is slid leftward, the leading end (forward end) of the install part  60  (left side plate  62 ) makes contact with and presses the inclined surface  85 C (see  FIG. 5 ) of the moving member  85  of the moving mechanism  80 . With this, the moving member  85  is moved downward against the biasing force of the coil spring  86  (see  FIG. 6 ) and is in a state of being accommodated in the space  81 C. Further, the bottom plate  61  of the install part  60  is slid leftward while passing on the moving member  85 . 
     The install part  60  is slid further leftward, the opening  70  formed in the rear end of the install part  60  arrives at the moving member  85 . With this, since there is not the thing (the bottom plate  61 ) which presses or pushes the moving member  85  from thereabove, the moving member  85  moved upward, via the opening  71 , due to the biasing force of the coil spring  86  and is projected upward from the bottom plate  81 A. Namely, the moving member  85  of the supporting mechanism  80  engages with the opening  71  of the install part  60 . With this, the installation of the install part  60  in the supporting mechanism  80  is completed. In this situation, a part of the moving member  85  (the projected part  85 D) is projected, via the opening  71 , leftward with respect to (to the left side of) the right side plate  63 . With this, as depicted in  FIG. 6 , the interlocking mechanism  66  which is provided on the left side of the right side plate  63  is moved upward by being pushed by the moving member  85 . By the upward movement of the interlocking mechanism  66 , the projected part  66 A of the interlocking mechanism  66  is moved to a height adjacent to a location behind (on the rear side of) the projection  65 D of the rotating piece  65 A. With this, the rotation of the rotating piece  65 A from the lock position toward the non-lock position is consequently regulated by the contact made by the projection  65 D with the projected part  66 A. 
     Further, in the case that the install part  60  is installed in the supporting mechanism  80 , the bottom part  85 A (the flat parts  85 E) of the moving member  85  which is moved upward makes contact, from the right side, with a pair of projected parts  63 D which are projected into the inside of the space  81 C from the lower end of the right side plate  63  of the install part  60 . Furthermore, in the case that the install part  60  is installed in the supporting mechanism  80 , the side plate  81 B of the bottom plate  81 A of the supporting mechanism  80  makes contact, from the left side, with the left side plate  62  of the install part  60 . With this, in the case that the install part  60  is installed in the supporting mechanism  80 , the install part  60  is positioned in the left-right direction  9  by the side plate  81 B and the moving member  85 . 
     In the install state that the install part  60  is installed in the supporting mechanism  80 , the rightward slide of the install part  60  is regulated by the moving member  85  (the flat parts  85 E) which makes contact, from the right side, with the pair of projected parts  63 D of the right side plate  63 , as described above. Namely, the rightward slide of the install part  60  is locked by the moving member  85  (an example of a “second look state”). The moving member  85  and the coil spring  86  biasing the moving member  85  are capable of locking the install part  60  in the state that the install part  60  is installed in the supporting mechanism  80 . The moving member  85  and the coil spring  86  are examples of a “second locking part”. 
     In the state that the install part  60  is installed in the supporting mechanism  80 , the detachment (removal) of the right end of the shaft  120  of the holder  35  from the bearing  64  is regulated by the rotating piece  65 A, as will be described in detail in the following. As described above, in a case that the right end of the shaft  120  is separated away from the bearing  64 , the right end of the shaft  120  makes contact, from the lower position, with the inclined surface  65 E of the rotating piece  65 A which is located at the lock position as indicated by the solid line in  FIG. 6 , and pushes or presses the inclined surface  65 E upward. In this case, normally, the rotating piece  65 A rotates from the lock position as indicated by the solid line in  FIG. 6  toward the non-lock position indicated by the broken line in  FIG. 6 . However, in the state that the install part  60  is installed in the supporting mechanism  80 , the rotating of the rotating piece  65 A from the lock position toward the non-lock position is regulated since the projection  65 D makes contact with the projected part  66 A of the interlocking mechanism  66 . Therefore, the rotating piece  65 A remains at the lock position, and it is not possible to remove the right end of the shaft  120  from the bearing  64 . Namely, the locking mechanism  65  is capable of locking the shaft  120  in a state that the right end of the shaft  120  is installed in the bearing  64  (an example of a “first look state”). Thus, the locking mechanism  65  is an example of a “first locking part”. 
     As described above, the interlocking mechanism  66  moves upward accompanying with the upward movement of the moving member  85  (operation in which the moving member  85  locks the install part  60  in a state that the install part  60  is installed in the supporting mechanism  80 ). With this, the interlocking mechanism  66  executes regulation of the rotation of the rotating piece  65 A from the lock position toward the non-lock position (operation in which the rocking mechanism  65  locks the shaft  120  in a state that the right end of the shaft  120  is installed in the bearing  64 ). In other words, the interlocking mechanism  66  interlocks the rotating piece (the first locking part)  65 A with the moving member (the second locking part)  85 , namely, the interlocking mechanism  66  maintain the rotating piece (the first locking part)  65 A in the lock position (the first lock state) in conjunction with the upward movement of the moving member  85  (a locking operation of the second locking part). 
     Further, as described above, the install part  60  is installed in the supporting mechanism  80  while being positioned in the up-down direction  7  and the front-rear direction  8 . During the process of the installation, the joint part  123  of the holder  35  is positioned at the position at which the joint part  123  is substantially coaxial with the shaft  82  of the supporting mechanism  80 . 
     Furthermore, in the process in which the install part  60  is installed in the supporting mechanism  80 , the joint part  123  is inserted, from the right side, into the through hole  96  (see  FIG. 3 ) of the columnar body  94  along the axis  82 A of the shaft  82 , as depicted in  FIG. 9 . On the other hand, the shaft  82  of the supporting mechanism  80  is inserted, from the left side, into the internal space of the main body  123 A of the joint part  123  along the axis  82 A of the shat  80 . Namely, the shaft  82  having the diameter smaller than the diameter of the through hole  96  is inserted into the central part of the through hole  96 , and a gap is defined between the shaft  82  and the inner circumferential surface of the through hole  96 . The main body  123 A (see  FIG. 8 ) of the joint part  123  is inserted into this gap. In this situation, at the same time, the shaft  82  is inserted into the inner space of the main body  123 A. 
     Moreover, in a case that the joint part  123  of the install part  60  is inserted into the through hole  96  of the columnar body  94 , the ribs  123 B of the joint part  123  are inserted into the cutouts  95  (see  FIG. 3B ), respectively, of the columnar body  94 . In this situation, each of the ribs  123 B is fitted in one of the cutouts  95  by making contact with and being guided by the pair of surfaces  95 A and  95 B which construct one of the cutouts  95 . Namely, even in such a case that there is a deviation, to some extent, in the positions of the joint part  123  and the columnar body  94  in the circumferential direction, each of the ribs  123 B makes contact with the pair of surfaces  95 A and  95 B of one of the cutouts  95  and is guided by the pair of surfaces  95 A and  95 B of one of the cutouts  95  in the circumferential direction, thereby correcting such a deviation in the positions. 
     Further, even in such a case that there is a deviation, to some extent, in the positions of the joint part  123  and the columnar body  94  not only in the circumferential direction but also in the up-down direction  7 , each of the ribs  123 B makes contact with and is guided by the pair of surfaces  95 A and  95 B of one of the cutouts  95 , thereby correcting such a deviation in the positions. A detailed explanation will be given in the following. 
     As described above, in the state that the holder  35  is installed in the install part  60 , the joint part  123  is contacted, from therebelow, by the bottom surface  67 A which constructs the cutout  67  of the install part  60  and is supported by the bottom surface  67 A. In this state, the joint part  123  is shifted downward slightly from the columnar body  94 . As describe above, however, in a case that the joint part  123  is inserted into the through hole  96  of the columnar body  94 , each of the ribs  123 B is guided by one of the pair of surfaces  95 A and  95 B of one of the cutouts  95 , and thus the joint part  123  is lifted upward by the columnar body  94 . Further, in a case that the install part  60  is allowed to be in the install state that the install part  60  is installed in the supporting part  80 , the ribs  123 B are allowed to be in a state that the ribs  123 B are completely fitted in the cutouts  95 , respectively. In this situation, as depicted in the enlarged view of  FIG. 9 , the joint part  123  is located above the bottom surface  67 A, and is separate away from the bottom surface  67 A. Furthermore, in this situation, the joint part  123  is installed in the shaft  82 , which in turn allows the shaft  82  to be completely coaxial with the shaft mechanism  51  (specifically, the shaft  120  of the shaft mechanism  51 ). Namely, the install state, in which the install part  60  is installed in the supporting mechanism  80 , is a state that the joint part  123  of the shaft mechanism  51  is installed in the shaft  82 . In other words, the install state is an attached state in which the shaft mechanism (the second shaft)  51  is attached to the shaft (the first shaft)  82 . 
     In the install state that the install part  60  is installed in the supporting mechanism  80 , in other words that each of the ribs  123  is completely fitted into one of the cutouts  95  (a state that the joint part  123  is linked with the columnar body  94  of the gear  83 ), the rotation of the gear  83  which is subjected to the driving transmittance from the motor  104  depicted in  FIG. 3  via the driving transmitting mechanism  105  depicted in  FIG. 3  is transmitted to the shaft mechanism  51  of the holder  35  via the columnar body  94  and the ribs  123 B. With this, the holder  35  is rotated, and the sheet S of the roll body  37  is fed out. Namely, the ribs  123 B are a part of a “rotation transmitting part”. Further, the ribs  123 B (an example of the “first engaging part”), the columnar body  94  (more specifically, the cutouts  95 ; an example of the “second engaging part”) and the pair of surfaces  95 A and  95 B (an example of a “tapered part”) guiding each of the ribs  123 B to the position at which each of the ribs  123 B engages with one of the cutouts  95  are also an example of the “rotation transmitting part”. 
     A procedure of detaching the install part  60  from the supporting mechanism  80  will be explained in the following. 
     Firstly, in a state that the install part  60  is installed in the supporting mechanism  80  (the state depicted in  FIG. 5 ), the moving member  85  is pushed downward. With this, the moving member  85  is moved downward against the biasing force of the coil spring  86 . As a result, the bottom part  85 A of the moving member  85  is located at a position below the pair of projected parts  63 D of the right side plate  63  of the install part  60 . With this, the install part  60  is slidable rightward. 
     Note that due to the downward movement of the moving member  85 , the interlocking mechanism  66  (see  FIG. 6 ) is moved downward due to the self-weight thereof. This makes possible to detach the holder  35  from the install part  60 . 
     Then, by sliding the install part  60  rightward, the install part  60  is detached from the supporting mechanism  80 , and is pulled out to the outside of the casing  30  via the opening  32  (see  FIG. 1 ). 
     Note that by the rightward moving of the install part  60 , the joint part  123  of the holder  35  is pulled out from the shaft  82  along the axis  82 A of the shaft  82 . Further, the ribs  123 B of the joint part  123  of the holder  35  are pulled out from the columnar body  94  of the gear  83 . With this, there is provided a state that the joint part  123  is moved downward, and that the joint part  123  is supported by the bottom surface  67 A constructing the cutout  67  of the left side plate  62  of the install part  60 . Namely, there is provided a state that the joint part  123  is temporarily supported by the bottom plate  67 A. 
     Effects of Embodiment 
     According to the above-described embodiment, the holder  35  supporting the roll body  37  is attached and detached with respect to the supporting mechanism  80  along the axis  82 A of the shaft  82 . The roll body  37  is moved parallel to the axis  82 A, and does not move in the radial direction of the shaft mechanism  51  of the holder  35 . Accordingly, there is no need to secure a space, in the casing  30 , for allowing the roll body  37  to pass in the radial direction of the shaft mechanism  51  of the holder  35 . Accordingly, it is possible to realize a reasonable layout inside the casing  30  and thus to realize a small-sized casing  30 . 
     Further, according to the above-described embodiment, each of the ribs  123 B is guided by the pair of surfaces  95 A and  95 B to a position at which each of the ribs  123 B engages with the columnar body  94 . Accordingly, it is possible to engage the ribs  123 B and the columnar  94  with each other in an assured manner. With this, it is possible to transmit the rotation of the gear  83  to the shaft mechanism  51  in an assured manner. 
     Furthermore, in a case of installing the roll body  37  in the casing  30  while grasping the roll body  37 , there is such a fear that the sheet S constructing the roll body  37  might become unwound (unreeled, loose). Moreover, in a case of installing the roll body  37  in the casing  30  while grasping the holder  35  at the both end parts in the left-right direction  9  of the roll body  37 , since the roll body  37  is not grasped, it is possible to prevent the sheet S from being unwound or becoming loose. However, since the roll body  37  and the holder  35  are installed in the casing  30  along the axis  82 A of the shaft  82 , namely along the left-right direction  9 , it is necessary that one of the hands that is grasping the holder  35  is placed at a far part of the casing  30  during the process of the installing. Accordingly, the installing of the holder  35  becomes difficult, and an additional space for placing the hand in the rear part of the holder  35  is required, as well. In the present embodiment, however, it is possible to grasp the install part  60  in a state that the holder  35  is supported by the install part  60 , and to install the install part  60  in the supporting mechanism  80  which is in the inside of the casing  30 . Accordingly, there is no need to grasp the roll body  37  and the holder  35 , and only a part, of the install part  60 , which is positioned on the front side with respect to the casing  30  is grasped and the install part  60  can thereby be installed in the supporting mechanism  80  along the left-right direction  9 . 
     Further, according to the present embodiment, the joint part  123  is separated away from the bottom part  67 A constructing the cutout  67  in the install state (the state depicted in  FIGS. 4 and 5 ). Accordingly, it is possible to reduce a contact location at which the shaft mechanism  51  and the install part  60  make contact with each other in the install state, it is possible to rotate the shaft mechanism  51  smoothly. 
     Furthermore, according to the above-described embodiment, it is possible to prevent the right end of the shaft  120  of the shaft mechanism  51  from being detached from the bearing  64 , by locking of the locking mechanism  65 . 
     Moreover, according to the above-described embodiment, it is possible to performing not only the locking of the install part  60  with respect to the supporting mechanism  80 , but also performing the locking of the right end of the shaft  120  of the shaft mechanism  51  with respect to the bearing  64 , by allowing the install part  60  to be installed in the supporting mechanism  80 . 
     Further, according to the above-described embodiment, the second externally fitting part  122  of the shaft mechanism  51  is rotated relative to the right flange  53  and the leaf spring parts  128  are guided to the outside in the radial direction, thereby allowing the leaf spring parts  128  to make contact with the roll body  37  and to push the roll body  37  toward the outside in the radial direction. With this, the position of the roll body  37  with respect to the holder  35  can be stabilized. 
     &lt;Modifications&gt; 
     In the above-described embodiment, although the gear  83  corresponds to the rotary body, the rotary body is not limited to or restricted by being the gear  83 . It is allowable, for example, that a pulley is arranged, instead of the gear  83 . In such a case, for example, the driving transmitting mechanism  105  has at least one pulley and an endless ring-shaped belt. Further, the belt is stretched between the pulley as the rotary body and the pulley possessed by the driving transmitting mechanism  105 . 
     In the above-described embodiment, the second externally fitting part  122  includes the projected parts  124 , and the right flange  53  includes the leaf spring parts  128 . It is allowable, however, that the right flange  53  includes the projected parts  124  and the second externally fitting part  122  includes the leaf spring parts  128 , contrary to the above-described embodiment. 
     The mechanism constructed of the projected parts  124  and the leaf spring parts  128  may be provided on the side of the left flange  52 , rather than on the side of the right flange  53 , or may be provided on the both sides which are the right flange  53  and the left flange  52 . 
     In the above-described embodiment, the gear  83  is a separate member from the shaft  82 , and is rotatable about the axis  82 A of the shaft  82 . It is allowable, however, that the shaft  82  and the gear  83  may be formed as an integrated body. 
     In such a case, different from the above-described embodiment, the shaft  82  is rotatably supported by the bent plate  81 F, rather than being fixed to the bent plate  81 F. 
     Further, in this case, the ribs  123 B of the joint part  123  may be configured to be connected or linked to the shaft  82 , rather than to the gear  83  (columnar body  94 ). 
     The configuration for transmitting the rotation from the gear  83  to the shaft mechanism  51  is not limited to the configuration, such as the above-described embodiment, wherein the ribs  123 B are fitted into the cutouts  95 , respectively, and may adopt a variety of kinds of publicly known configurations. 
     Further, it is allowable that the supporting mechanism  80  has a shape supportable by the shaft  82 ; the specific shape of the supporting mechanism  80  is not limited to or restricted by the shape depicted, for example, in  FIG. 3 , etc. For example, in the supporting mechanism  80 , it is allowable to use a block of which shape is a rectangular parallelepiped, instead of using the frame  81 . 
     Furthermore, it is allowable that the install part  60  may have a shape different from the shape depicted in  FIG. 4 , etc., under a condition that the install part  60  has the bearing  64  and that the shape of the install part  60  is a shape attachable/detachable with respect to the supporting mechanism  80 . 
     The opening  32  of the casing  30  may be formed in a part, of the casing  30 , which is different from the right surface  30 R. 
     In the above-described embodiment, the holder  35  is installed in the install part  60 , and the install part  60  having the holder  35  installed therein is installed in the supporting mechanism  80 . It is allowable, however, that the image recording apparatus  100  is not provided with the install part  60 , and that the holder  35  is directly installed in the supporting mechanism  80 . In such a case, for example, it is allowable that the shaft  82  provided on the supporting mechanism  80  extends more rightward than the above-described embodiment; and that the shaft  120  provided on the holder  35  is configured to be shorter than that in the above-described embodiment, and is provided only on the right end of the shaft mechanism  51 . Further, in a case that the holder  35  is installed in the supporting mechanism  80 , it is allowable that the holder  35  is inserted into the casing  30  while being slid leftward so that the shaft  82  of the supporting mechanism  80  is inserted into the inside of the shaft mechanism  51  of the holder  35 . With this, there is provided a state wherein the shaft mechanism  51  is supported by the shaft  82 , and the holder  35  is installed in the supporting mechanism  80 . 
     In the above-described embodiment, the conveying roller pair  36 , the conveying roller pair  40  and the conveying belt  101  correspond to the “conveyor”. The conveyor, however, is not limited to or restricted by being the conveying roller pair  36 , the conveying roller pair  40  and the conveying belt  101 . It is allowable, for example, that the conveyor is not provided with any roller pair, and that the conveyor is constructed only of one piece or a plurality of pieces of a conveying belt. Alternatively, it is allowable, for example, contrary to the foregoing that the conveyor is not provided with any conveying belt, and that the conveyor is constructed only of one piece or a plurality of pieces of a roller pair. Of course, it is allowable that the conveyor is provided with both of the roller pair and the conveying belt. For example, it is allowable that the conveyor is provided with the conveying belt, instead of the conveying roller pairs  36  and  40 , and/or is provided with a roller pair instead of the conveying belt  101 . 
     The sheet S may take a configuration different from that in the above-described embodiment, under a condition that the sheet S is continuous. For example, the sheet S may have perforations so that the sheet S can be cut manually. In such a case, it is allowable that the image recording apparatus  100  is not provided with the cutter unit  26 . 
     In the above-described embodiment, although the image recording apparatus  100  records an image on a sheet by the ink-jet system, it is allowable that a printing system of the electro-photographic system is adopted, or a thermal head is adopted, instead of adopting the ink-jet system. In such a case, the tank  34  is omitted. 
     In the above-described embodiment, the image recording apparatus  100  which performs recording on the sheet S is explained, as an example of the conveying apparatus. The conveying apparatus, however, is not limited to the image recording apparatus  100 , and may be an apparatus which conveys the sheet S (for example, a scanner).