JP2007217140A - Sheet feeding device and image forming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet feed cassette mechanism enabling an increase in working efficiency during the supplement of sheets and the change of the size of the sheets since a cassette body can be drawn from an image forming device body to a sufficient length and having both usability and strength capable of sufficiently resisting its damage by the total load of a cassette including the weight of the sheets. <P>SOLUTION: The sheet feed cassette storing the sheets is attached to and detached from a cassette mounting part on the printer body side. The sheet feed cassette is extendable according to the size of the sheets stored therein. A plurality of movable stoppers 20 rotatable to a restricting position and a standby position are installed at the front and rear positions in the drawing direction of the paper feed cassette. By selectively rotating the movable stopper 20 to the restricting position according to the extended state of the sheet feed cassette, the restricting position set when the sheet feed cassette is drawn from the cassette mounting part can be changed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an image forming apparatus such as a copying machine, a facsimile machine, a printer, and a multifunction machine, and also relates to a sheet feeding apparatus mounted on the image forming apparatus.

  A sheet cassette that stacks and accommodates sheets of large size recording paper such as A3 or leisure may be larger in the front-rear direction and longer than the front-rear depth dimension of the image forming apparatus main body. is there. When sheets are stacked on such a large sheet cassette, the total weight of the cassette body itself and the sheet stacking weight increases. In that case, when the sheet feeding cassette is pulled out from the image forming apparatus main body to the maximum when sheets are replenished or the size is changed, it is conceivable that a total load is applied and the cassette main body or the image forming apparatus main body is damaged. In order to prevent this, it is effective to adopt a structure in which the sheet cassette is pulled out from the main body of the image forming apparatus to a certain extent so that the cassette body is regulated so as not to be pulled out for a longer time. However, if the cassette main body cannot be pulled out from the image forming apparatus main body to a sufficient length as regulated by the stopper, there is a conflicting problem that it becomes difficult to perform sheet replenishment and size change operations.

  As a technology related to such a cassette drawer mechanism, a roller is provided in the paper feed cassette to smoothly slide, and a projection is provided in the image forming apparatus main body and the paper feed cassette to provide a stopper for restricting cassette drawer. There is a paper cassette attaching / detaching device (see, for example, Patent Document 1). Furthermore, a paper feed cassette having improved maintainability by adopting a structure in which stoppers are provided at two locations and a restriction is applied twice when the paper feed cassette is pulled out has been proposed (for example, see Patent Document 2).

Japanese Patent Laid-Open No. 11-20961 JP 2002-154664 A

  By the way, in the structure in which the stopper restricting portion for restricting the pull-out length of the paper feed cassette is provided at one place, the pull-out amount is always limited to be constant for both large and small paper feed cassettes. Therefore, there is an inconvenience that maintenance can be good or bad depending on the paper type. On the other hand, in the structure in which the stopper restricting portions are provided in two places, it is necessary to release the stopper restriction twice if the paper feeding cassette is to be completely pulled out, which is troublesome and troublesome for the user.

  When the sheet is refilled or the size is changed, it is necessary to regulate the trailing edge or both side edges of the sheet to be accommodated. Therefore, in order to make the trailing edge regulating member easy to operate, the cassette body should be sufficiently separated from the image forming apparatus body. It is best to pull it out toward you. However, when a large size sheet such as A3 or leisure is set, almost the entire paper cassette is pulled out from the main body of the image forming apparatus. The total weight including the weight of the seat can be supported. Then, the weight concentrates on the rear end of the supporting cassette, and there is a concern that the cassette body and the machine body may be damaged particularly in a low-cost low-end printer.

  From the above, the object of the present invention is that the cassette body can be pulled out from the image forming apparatus body to a sufficient length, so that the workability at the time of sheet replenishment and size change is improved, and it is sufficient for damage due to the total load of the cassette including the sheet weight. It is an object of the present invention to provide a paper feeding cassette mechanism that has both durability and strength.

  In order to achieve the above object, the present invention provides a sheet feeding cassette that accommodates sheets and is detachable from a cassette mounting portion provided in the apparatus main body, and a sheet feeding means for feeding sheets from the sheet feeding cassette. In the sheet feeding apparatus having the above-described configuration, a position that restricts the drawer when the sheet feeding cassette is pulled out from the apparatus main body can be changed according to the size of the stored sheet.

  According to another aspect of the present invention, there is provided an image forming apparatus including the sheet feeding device and an image forming unit that forms an image on a sheet fed from the sheet feeding device.

  According to the present invention, the drawing length of the sheet cassette from the apparatus main body is variably adjusted according to the sheet size, and the sheet cassette can be pulled out to the maximum when sheets are replenished or changed in size. Convenience increases.

  Further, according to the image forming apparatus of the present invention, the drawing position of the paper feed cassette from the cassette mounting portion can be adjusted according to the sheet size. Therefore, for example, even when a large size sheet is stacked and the weight is increased, the apparatus can be prevented from being damaged.

  A preferred embodiment of a paper feed cassette attaching / detaching mechanism and an image forming apparatus according to the present invention will be described below in detail with reference to the drawings.

  1 and 2 show a laser beam printer as an embodiment of an image forming apparatus. A sheet feeding cassette 2 that stacks and accommodates sheets P is detachable from the printer main body 1. A cassette mounting portion having a front insertion port 3 for attaching and detaching the paper feed cassette 2 to the lower portion of the printer main body 1 and a rear end port 4 is provided so that a part of the paper feed cassette 2 can protrude out of the printer main body 1. It has been.

  In the cassette loading section, the sheets P stacked one by one by the half-moon-shaped sheet feeding roller 5 provided in the sheet feeding unit 2 which is the sheet feeding unit of the present invention are fed one by one, and the latent image is carried by the pair of opposed conveying rollers 6. It is conveyed toward the photosensitive drum 7 as a body. A toner is charged and attached to the electrostatic latent image formed on the surface of the photosensitive drum 7 with a laser beam corresponding to a print (image) signal from a laser scanner unit 8 having a laser unit, a rotating polyhedron, and the like on the sheet P. After the transfer, the image is fixed by the fixing unit mechanism 9, and the sheet P is discharged to the discharge tray 11 through the discharge unit mechanism 10.

  2A and 2B are views of the paper feed cassette 2 as viewed from above. The paper feed cassette 2 includes a first cassette part 22 and a second cassette part 23 made of synthetic resin that are molded, and has a handle hole for a user to perform a pulling operation at the front end. The second cassette portion 23 is slid with respect to the first cassette portion 22 [see (a) of the same figure] so that the entire length of the cassette is connected to be extendable. In the expansion and contraction operation, the bottom plate of the second cassette portion 23 is placed along the bottom surface of the bottom plate of the first cassette portion 22, and the ribs 13 provided at the lower portions of the left and right side walls 24 of the first cassette portion 22 and the second cassette portion 23 are the printer body. This is possible by being guided by the guide rail on one side.

  3A and 3B show a state in which the sheet cassette 2 in which the first cassette portion 22 and the second cassette portion 23 are stacked is shortened and stored in the printer main body 1 and pulled out (the sheet P). For replenishment etc.) 4A and 4B show a state in which the first cassette portion 22 and the second cassette portion 23 are extended to extend the paper feed cassette 2 and are housed in the printer main body 1 and pulled out. As shown in these figures, ribs 13 extending in the cassette length direction are provided on the side walls on both sides of the first and second cassette portions 22 and 23, and a total of four L-shapes are provided on the front and rear sides and on the left and right sides in the cassette length direction. A block-shaped movable stopper (movement restricting means) 20 is provided. On the other hand, as shown in FIGS. 5A and 5B, the printer main body 1 includes a lower guide rail 17 that receives the paper feeding cassette 2 on the lower surface of the rib 13 over the entire length of the cassette mounting portion, and guides the movement. An upper guide rail 18 for guiding the upper surface of 13 is provided. A block-shaped fixed stopper (movement restricting means) 21 is provided at the front side front end of the lower guide rail 17. Then, by engaging with the movable stopper 20 on the cassette side and the fixed stopper 21 on the printer main body side, the drawer function of the sheet feeding cassette 2 is regulated by functioning as a stopper.

  Similarly, in FIGS. 5A and 5B, the movable stopper 20 formed in an L shape has a boss shaft 26 extending vertically at the center thereof, and the boss shaft 26 is open to the upper and lower ribs 13. The movable stopper 20 is rotated about the boss shaft 26 by being fitted in the engagement hole. The movable stopper 20 is biased in the clockwise direction by the torsion coil spring 25, and the movable stopper 20 on the right side in FIG. 5 is biased in the counterclockwise direction. ing. The movable stopper 20 rotates in any one of the rotation directions in conjunction with the expansion and contraction operation by sliding the first cassette portion 22 and the second cassette portion 23 in the front-rear direction. When the paper feed cassette 2 is shortened, the left side wall 30 of the first cassette unit 22 exists just inside the left side wall of the second cassette unit 23. Therefore, the front movable stopper (left movable stopper in FIG. 5) 20 is a state in which the L-shaped short arm tip abuts against the left side wall of the main frame and the long arm is positioned in the rib 13. (This position is called a standby position). The rear movable stopper 20 (the right movable stopper in FIG. 5) 20 in the cassette pull-out direction has an L-shaped short arm that hits the left side wall and a long arm that protrudes outside the rib 13. Therefore, when the paper feed cassette 2 is shortened, the rear movable stopper 20 protrudes outward from the left and right ribs 13 (this position is referred to as a restriction position). As shown in FIG. 5B, when the loaded paper cassette 2 is pulled out in this state, the rear movable stopper 20 abuts against the fixed stopper 21 of the lower guide rail 17 of the printer body 1 and pulls out further. Is regulated. Note that the sheet cassette is defined as “front side” and “rear side” with reference to the drawing direction from the mounting position.

  5A and 5B show a case where, for example, the sheet P such as A4 of normal size is replenished and stacked with the sheet cassette 2 shortened, and corresponds to the sheet size. Thus, the first cassette portion 22 and the second cassette portion 23 are shortened. In this case, the movable stopper 20 on the rear side of the cassette rises and comes into contact with a fixed stopper 21 provided on the printer main body 1 side, thereby preventing further cassette movement. The paper feed cassette 2 is loaded with A4 sheets with almost the entire length pulled out, and prepared for mounting on the printer main body 1. The sheet weight and the cassette self-weight act on the abutting portion of the movable stopper 20 and the fixed stopper 21 shown in FIG. 5B, and a moment due to the “cantilever” acts. , 21 has sufficient mechanical strength to withstand.

  On the other hand, FIGS. 6A and 6B show a state where the first cassette portion 22 and the second cassette portion 23 are extended to pull out the paper feed cassette 2 from the printer body 1. That is, for example, this is a state when a large size such as A3 is loaded or replenished. In this case, as shown in FIG. 6A, when the second cassette portion 23 is slid with respect to the first cassette portion 22 of the paper feed cassette 2 to extend the cassette length, the respective movable stoppers 20 abut against each other. Further, the left side wall 30 of the first cassette portion 33 slides and the contact with the movable stopper 20 is cut off. As shown in FIG. 6B, the four movable stoppers 20 whose contact has been cut off are rotated by the urging force of the torsion coil spring 25. The movable stopper 20 on the front side in the cassette drawing direction rotates in the clockwise direction so that the L-shaped short arm hits the front surface of the hole 27 formed in the left side wall 24 of the second cassette portion 23, and the long arm extends from the rib 13. It moves to the restricting position protruding outward. The rear movable stopper 20 rotates clockwise, the L-shaped short arm hits the front face 28 of the hole opened in the left side wall, and the long arm moves to the standby position where it is housed inside the rib 13. Therefore, when the paper feed cassette 2 is extended, the front movable stopper 20 protrudes from the left and right ribs 13. When shortening the paper feed cassette 2 in the state where the cassette length is extended, the movable stopper 20 protrudes slightly inside the left side wall of the second cassette portion 23, so that it interlocks with the slide of the first cassette portion 22. The two front and rear movable stoppers 20 rotate counterclockwise. At that time, the front movable stopper 20 returns to the protruding state.

  Also in this case, as described with reference to FIGS. 5A and 5B, the sheet weight and the cassette self-weight are the contact between the front movable stopper 20 and the fixed stopper 21 in the cassette drawing direction in FIG. 6B. Acting on the part, the moment as if "cantilever" works. The movable stopper 20 and the fixed 21 on the front side have sufficient mechanical strength to withstand this moment load.

  Next, the paper feed cassette 2 may be completely removed from the printer main body 1 after the paper feed cassette 2 is pulled out from the printer main body 1 and once its movement is restricted. In that case, it is performed based on the following operation procedure.

  As shown in FIGS. 5A and 5B and FIGS. 6A and 6B, the lower guide 17 of the printer main body 1 slides while supporting the lower surface of the rib 13 of the paper feed cassette 2. Since the fixed guide 21 is provided at the foremost end of the lower guide 17, when the paper feed cassette 2 is pulled out to the near side, the movable stopper 20 projecting outside the rib 13 comes into contact with the stepped portion to feed the paper. The cassette 2 is once restricted from being pulled out. Here, as shown in FIGS. 7A and 7B, when the front portion of the first cassette portion 22 of the paper feed cassette 2 is lifted in the cassette movement restricted state, the movable stopper 20 is fixed to the fixed stopper 21 of the lower guide 17. The movement restriction state is canceled by overcoming. Thereby, the paper feed cassette 2 can be completely removed from the printer main body 1. In FIG. 7B, when the second cassette portion 23 is extended from the first cassette portion 22 and lifted when it is extended, the rear end of the cassette serving as a lifting fulcrum is separated from the movable stopper 20, so that the movement is restricted by lifting it a little. The state can be released. On the other hand, at the time of shortening, as shown in FIG. 7A, the lifting fulcrum is close to the movable stopper 20, so that the movement restriction state is lifted by a larger amount than at the time of extension.

(Second Embodiment)
FIGS. 8A and 8B and FIGS. 9A and 9B show a paper feed cassette 31 according to the second embodiment. In this case, the paper feed cassette 31 is the first of the first embodiment. The cassette unit 22 and the second cassette unit 23 are integrated into one frame (denoted by reference numeral 31).

  The paper feed cassette 31 has a rear end regulating portion 32 that abuts the rear end of the bundle of sheets P to be accommodated and regulates the position. A boss shaft 34 as a stopper member of the present invention extends downward from the rear end regulating portion 32, and the boss shaft 34 protrudes downward from the bottom surface of the paper feed cassette 31. In addition, a movable stopper member 33 as a link member of the present invention is provided on the lower surface of the paper feed cassette 31 so as to be movable to a position symmetrical to the sheet conveyance direction. The movable stopper member 33 rotates around the rotation center 35 and is urged by a spring member (not shown) so that the position shown in the drawing is in a natural state. One end of the movable stopper member 33 serves as the movable stopper member of the present invention. A protrusion 36 is provided. Similar to the boss shaft 34, the protrusion 36 protrudes from the bottom surface of the paper feed cassette 31.

  9A and 9B show a state in which large-sized sheets P are stacked and stored in the paper feed cassette 31 and the rear end regulating portion 32 has moved to the rear of the paper feed cassette 31. FIG. When the rear end restricting portion 32 is moved to the rear end of the sheet feeding cassette 31, the boss shaft 34 of the rear end restricting portion 32 comes into contact with the movable stopper 33 and rotates around the rotation center 35 against the spring member. FIGS. 10A and 10B show the bottom surface in a state in which the paper feed cassette 31 is pulled out from the printer body 1, and FIG. 10A shows the same when the small-sized sheets P shown in FIG. 8 are stacked. FIG. 7B shows a case where the large size sheets P shown in FIG. 9 are stacked. 11 (a) and 11 (b) are side cross-sectional views corresponding to FIGS. 10 (a) and 10 (b). 12 (a) and 12 (b) show enlarged circles in FIGS. 10 (a) and 10 (b).

  As shown in FIG. 12, a bottom plate 37 serving as a fixed stopper according to the present invention is provided at the front of the printer main body 1, and when the paper feed cassette 31 is pulled out from the printer main body 1, The protrusion 36 of the stopper 33 comes into contact. Therefore, in the case of a small-sized sheet P as shown in FIG. 8, when the paper feed cassette 31 is pulled out from the printer main body 1, the boss shaft 34 of the rear end restricting portion 32 comes into contact with the bottom plate 37 so that the pull-out direction. Movement is restricted.

  Since the position of the trailing edge restricting portion 32 directly indicates the movement restricting state, fine settings corresponding to the sizes of various sheets P are possible. When large-sized sheets P such as A3 and leisure are stacked, as shown in FIG. 12B, the movable stopper 33 is rotated by the boss shaft 34 of the rear end restricting portion 32, so that the protruding portion 36 becomes the sheet feeding cassette. It moves to the front side in the pull-out direction of 31. When the paper feed cassette 31 is pulled out from the printer main body 1 in this state, the protrusion 36 comes into contact with the bottom plate 37 and movement in the pulling direction is restricted. Accordingly, when the rear end restricting portion 32 is shifted backward by a certain amount or more, the member that contacts the bottom plate 37 moves from the boss shaft 34 of the rear end restricting portion 32 to the protrusion 36 of the movable stopper 33, and the paper cassette 31 is pulled out. It is possible to adjust so that the amount does not become too large.

(Third embodiment)
FIGS. 13A and 13B show a case where the stopper function of the second embodiment based on the rear end restriction is provided in the extendable sheet feeding cassette described in the first embodiment as the third embodiment. Yes. 13 is a top view and a bottom view when the paper cassette is shortened, FIG. 14 is a top view and a bottom view when a large size sheet P such as A3 or LDR is stacked when the paper cassette is extended, and FIG. A top view and a bottom view are shown when a medium-sized sheet P such as LGL is stacked when the paper cassette is extended.

  The extendable paper feeding cassette is constituted by a first cassette part 38 and a second cassette part 40 having the same structure as the first cassette part 22 and the second cassette part 23 shown in the first embodiment, and the second cassette part. 40 is slidable with respect to the first cassette portion 38 to be telescopic. The rear end restricting portion 32 and the movable stopper 33 have the same function as that of the second embodiment and have a stopper function. The difference from the second embodiment is that the movable stopper 33 is rotatable in both the clockwise direction and the counterclockwise direction from the natural state position shown in the second embodiment. Further, a protrusion 41 is provided on the back side of the protrusion 36, and the protrusion 41 protrudes from a hole opened in the bottom surface of the second cassette portion 40.

  In a state where the paper feed cassette 31 is shortened (see FIG. 13), the movable stopper 33 moves with the protrusion 41 hitting the rear surface 42 of the first cassette portion 38. In such a state, since the movable stopper 33 escapes from the locus of movement of the boss 36 of the trailing end regulating member 32, the boss 36 of the trailing end regulating member 32 directly serves as a stopper for the sheet feeding cassette. When the paper feed cassette is extended, the parts that serve as stoppers differ depending on whether the rear end regulating member 32 has moved to the rear end or the front end (see FIG. 14). As shown in FIG. 14, in a state where A3 or LDR size sheets P are stacked, the rear end regulating boss shaft 34 rotates the movable stopper 33 to move the position of the protrusion 36 forward. As shown in FIG. 15, in a state where the LGL size sheets P are stacked, the movable stopper 33 is not affected by the boss shaft 34 for restricting the rear end, so that it stops at the natural position.

  FIGS. 16A and 16B and FIGS. 17A and 17B show a state in which the extendable paper feeding cassette is pulled out from the printer body 1. As in the case of the second embodiment, the printer main body 1 includes a bottom plate 37 in front of the apparatus, and the rear end regulating boss 34 and the protrusion 36 are in a positional relationship where the paper feed cassette is pulled out. When the shortened sheet cassette is pulled out, the boss 34 of the trailing edge regulating member 32 hits the bottom plate and serves as a stopper. When the sheet cassette is extended, the trailing edge regulating member 32 is used for medium-sized sheets P such as LGL. When the large sized sheet P such as A3 is set once with the boss 34 of the boss 34 being pulled out, the protrusion 36 of the movable stopper 33 hits the bottom plate 37 and the stopper function works.

  The present invention is not limited to the first to third embodiments, and other embodiments, application examples, and combinations thereof are possible as long as they do not depart from the gist of the present invention. is there.

1 is a diagram illustrating an image forming apparatus including a paper feed cassette mechanism according to an embodiment. FIGS. 4A and 4B are views showing the paper feeding cassette according to the present embodiment when shortened and extended as viewed from above. FIGS. 4A and 4B are views showing the image forming apparatus main body stored and pulled out in a shortened state when the sheet feeding cassette of the present embodiment is viewed from the side. FIGS. 4A and 4B are views showing the sheet feeding cassette of the present embodiment when stored in the extended state and when pulled out when viewed from the side. FIGS. 4A and 4B are diagrams showing a maximum pull-out state in a shortened state when the sheet feeding cassette of the present embodiment is viewed from the side. FIGS. 4A and 4B are diagrams showing a maximum drawer when the sheet feeding cassette according to the present embodiment is viewed from the side in an extended state. FIGS. 4A and 4B are views in a shortened state and an extended state when the paper feeding cassette of the present embodiment is completely removed from the image forming apparatus. FIGS. 9A and 9B are a top view and a bottom view of the paper feed cassette according to the second embodiment. The top view and bottom view of the paper feed cassette of the second embodiment. The top view and bottom view of the principal part of the paper feed cassette of the second embodiment. The side view which shows the drawer operation | movement of the paper feed cassette of the said 2nd Embodiment. The enlarged view which shows operation | movement of the principal part of the paper feed cassette of the said 2nd Embodiment. (A), (b) is a figure which shows the case where the stopper function by back end regulation is provided in the expansion-contraction type paper feed cassette as 3rd Embodiment. The top view and bottom view at the time of stacking large size sheets P such as A3 and LDR when the paper feed cassette is extended in the third embodiment. FIG. 10 is a top view and a bottom view when a medium-sized sheet P such as LGL is stacked when the sheet feeding cassette is extended in the third embodiment. The bottom view when the stopper functions by pulling out the telescopic paper cassette from the main body in the third embodiment (a) When shortened (b) When extended. FIG. 17 is a cross-sectional view of FIG. 16 in the third embodiment.

Explanation of symbols

1 Printer body (image forming device body)
2 Feed cassette 13 Rib of feed cassette 17 Lower guide 18 Upper guide 20 Movable stopper for movement restriction 22 First cassette part 23 Second cassette part 25 Torsion coil spring 26 Movable stopper boss shaft 27 Front movable stopper Abutting surface 28 Abutting surface of rear movable stopper 30 Side wall of first cassette portion 31 Body-type paper cassette 32 Rear end regulating portion P Sheet (recording paper)

Claims (7)

In a sheet feeding apparatus comprising: a sheet feeding cassette that accommodates a sheet and is detachable from a cassette mounting portion provided in the apparatus main body; and a sheet feeding unit that feeds a sheet from the sheet feeding cassette.
A sheet feeding apparatus characterized in that a position that is a restriction of drawer when the sheet feeding cassette is pulled out from the apparatus main body can be changed according to the size of the stored sheet. The sheet feeding means is disposed so as to feed the sheet from the sheet feeding cassette along the pulling direction of the sheet feeding cassette;
The cassette body of the paper feed cassette comprises a first cassette part and a second cassette part connected to the first cassette part,
The rear end side of the cassette body in the cassette pull-out direction is shortened or extended by sliding the second cassette portion relative to the first cassette portion according to the size of the accommodated sheet,
2. The sheet according to claim 1, wherein a position that restricts a drawer when the sheet feeding cassette is pulled out can be changed according to a sliding position of the second cassette unit with respect to the first cassette unit. Feeding device. A plurality of movable stoppers are provided in the second cassette portion along the attachment / detachment direction of the paper feed cassette, and are movable between a restriction position for restricting the drawer and a retracted position not restricting the drawer,
When the sheet feeding cassette is pulled out from the cassette mounting portion in a state where the movable stopper is in the regulation position, the drawer position of the sheet feeding cassette is regulated by engaging with a fixed stopper provided in the apparatus main body,
The movable stopper is configured to selectively move to the restriction position in accordance with a slide movement position of the second cassette part with respect to the first cassette part,
When the cassette body is in a shortened state, the drawer of the paper feed cassette is regulated by selectively moving the movable stopper located at the rear of the paper feed cassette in the withdrawal direction to the regulation position,
When the cassette body is in an extended state, the movable cassette located in front of the sheet feeding cassette in the pulling direction is selectively moved to the regulation position to regulate the drawer of the sheet feeding cassette. The sheet feeding apparatus according to claim 2. The sheet feeding means is disposed so as to feed the sheet from the sheet feeding cassette along the pulling direction of the sheet feeding cassette;
A rear end regulating member for regulating the rear end of the sheet is movably provided in the cassette body according to the accommodated sheet size,
The sheet feeding apparatus according to claim 1, wherein a position that is a restriction of a drawer when the sheet feeding cassette is pulled out can be changed according to a movement position of the trailing edge regulating member. A stopper member for restricting the drawer of the paper feed cassette is provided on the rear end regulating member,
A movable stopper member for restricting the drawer of the paper feed cassette is provided in the cassette body so as to be movable along the attachment / detachment direction of the paper feed cassette,
Providing a link member for interlocking the rear end regulating member and the movable stopper member;
When the paper feed cassette is pulled out from the cassette mounting portion, the stopper member or the movable stopper member is locked to the fixed stopper on the apparatus main body, thereby restricting the drawing position of the paper feed cassette,
The link member is moved according to the position of movement of the rear end regulating member according to the sheet size, and the stopper member or the movable stopper member is selectively locked to the fixed stopper.
When the trailing edge regulating member is positioned in front of the sheet feeding cassette in the pulling direction, the drawer of the sheet feeding cassette is regulated by the stopper member of the trailing edge regulating member,
5. The sheet feeding apparatus according to claim 4, wherein when the trailing edge regulating member is positioned behind the sheet feeding cassette in the pulling direction, the sheet feeding device is regulated by the movable stopper member. The cassette body of the paper feed cassette comprises a first cassette part and a second cassette part connected to the first cassette part,
The cassette body is configured such that the rear end side of the cassette main body is shortened or extended by sliding the second cassette portion with respect to the first cassette portion according to the size of the accommodated sheet,
The sheet feeding apparatus according to claim 5, wherein the rear end regulating member, the movable stopper portion, and the link member are arranged in the second cassette portion. Feeding device. The sheet feeding apparatus according to any one of claims 1 to 6,
An image forming unit that forms an image on a sheet fed from the sheet feeding device;
An image forming apparatus comprising:

Images