JP2018100173A - Sheet storage cassette and image forming apparatus provided therewith - Google Patents

Abstract

A sheet storage cassette capable of suppressing a decrease in rigidity and an image forming apparatus including the sheet storage cassette are provided. A paper feed cassette (sheet storage cassette) 10 is movable in the paper width direction with respect to a paper storage portion S and is positioned in contact with a side edge portion of paper P stacked on a paper stacking plate 16. Width alignment cursors 20a and 20b are provided on the first rear end cursor 30 that can move in the paper feeding direction and that abuts against the rear end of the paper P for positioning, and the width alignment cursors 20a and 20b. And a second rear end cursor 40 for positioning by contacting the rear end portion of the paper P having a smaller size than the paper P for positioning. [Selection] Figure 3

Description

  The present invention relates to a sheet storage cassette including a sheet stacking plate and a rear end cursor for positioning by contacting a rear end portion of a sheet placed on the sheet stacking plate, and an image forming apparatus including the same.

  2. Description of the Related Art Conventionally, a sheet storage cassette having a sheet stacking plate and a rear end cursor that is movable in the sheet feeding direction and positions the rear end of the sheet placed on the sheet stacking plate has been widely used. It is used. The trailing edge cursor moves in the sheet feeding direction along a slit provided in the bottom surface portion of the sheet storage cassette, and contacts the trailing edge portion of the sheet for positioning.

  Note that a sheet storage cassette including a rear end cursor is disclosed in, for example, Patent Document 1.

JP-A-11-189342

  However, in the conventional sheet storage cassette, it is necessary to form a large slit on the bottom surface portion of the sheet storage cassette in order to bring the rear end cursor into contact with the rear end portion of the sheet from the maximum size to the minimum size. For this reason, there has been a problem that the rigidity of the sheet storage cassette is lowered. When the rigidity of the sheet storage cassette is lowered, the sheet storage cassette is twisted, and a paper feed failure such as paper skew (oblique paper feed) occurs.

  SUMMARY An advantage of some aspects of the invention is to provide a sheet storage cassette capable of suppressing a reduction in rigidity and an image forming apparatus including the sheet storage cassette. That is.

  In order to achieve the above object, a sheet storage cassette according to a first configuration of the present invention is a sheet storage cassette that can be attached to and detached from a cassette mounting portion of an apparatus main body, and includes a sheet storage portion that stores sheets, and a sheet A portion upstream of the sheet feeding direction is supported by the storage unit in a rotatable manner, and a sheet stacking plate on which sheets are stacked on the upper surface, and a sheet width direction perpendicular to the sheet feeding direction on the bottom surface of the sheet storage unit. Yes, it can be moved in the sheet feeding direction on the bottom surface of the sheet storage unit and a width alignment cursor for positioning by contacting the side edge of the sheet stacked on the sheet stacking plate. A first rear end cursor that is positioned in contact and a width alignment cursor, and a second rear end that is positioned by contacting the rear end of a sheet that is smaller than the sheet that is positioned by the first rear end cursor. car Including Le and, the. The width alignment cursor includes a side end regulating portion having a side end contact surface that contacts the side end portion of the sheet, and the second rear end cursor is disposed along the side end contact surface, and the rear end portion of the sheet And a retracted position that protrudes inward in the sheet width direction with respect to the side end contact surface and can contact the rear end of the sheet.

  According to the sheet storage cassette of the first configuration of the present invention, the first sheet is provided in the width alignment cursor, and the first rear end cursor is in contact with the rear end portion of the sheet having a smaller size than the sheet to be positioned. Two rear end cursors are provided. Thereby, the first rear end cursor and the second rear end cursor can be used properly according to the sheet size. That is, it is not necessary to use the first trailing edge cursor for sheets of all sizes from the maximum size to the minimum size. For this reason, since the slit provided in the bottom face part of a sheet storage cassette can be made small, it can suppress that the rigidity of a sheet storage cassette falls. As a result, it is possible to prevent the sheet storage cassette from being twisted, and thus it is possible to suppress the occurrence of sheet feeding defects such as sheet skew (oblique feeding).

1 is a perspective view illustrating a structure of an image forming apparatus on which a paper feed cassette according to a first embodiment of the present invention is mounted. 1 is a front view showing an internal structure of an image forming apparatus on which a paper feed cassette according to a first embodiment of the present invention is mounted. It is the perspective view which showed the structure of the paper feed cassette of 1st Embodiment of this invention. It is the perspective view which showed the structure of the paper feed cassette of 1st Embodiment of this invention. It is the perspective view which showed the structure of the width alignment cursor and 2nd rear end cursor of the paper feed cassette of 1st Embodiment of this invention, and is the figure which showed the state which has arrange | positioned the 2nd rear end cursor in the retracted position. It is the perspective view which showed the structure of the width alignment cursor and 2nd rear end cursor of the paper feed cassette of 1st Embodiment of this invention, and is the figure which showed the state which has arrange | positioned the 2nd rear end cursor in the protrusion position. It is the perspective view which showed the structure of the 2nd rear end cursor of the paper feed cassette of 1st Embodiment of this invention. It is the perspective view which showed the structure of the width alignment cursor of the paper feed cassette of 1st Embodiment of this invention. FIG. 3 is a top cross-sectional view illustrating a structure of a side end regulating portion of a width alignment cursor of the paper feed cassette according to the first embodiment of the present invention. It is the perspective view which showed the structure of the engaging part vicinity of the width alignment cursor of the paper feed cassette of 1st Embodiment of this invention. FIG. 5 is a top cross-sectional view showing the structure of a width alignment cursor and a second rear end cursor of the paper feed cassette according to the first embodiment of the present invention, and a view showing a state in which the second rear end cursor is arranged at a protruding position. . It is the figure which showed the state which moved the 2nd rear end cursor to the arrow B direction from the state of FIG. It is the figure which showed the state which rotated the 2nd rear end cursor only the predetermined angle from the state of FIG. It is the perspective view which showed the structure of the 2nd rear end cursor and side end control part of the paper feed cassette of 2nd Embodiment of this invention, and is the figure which showed the state which has arrange | positioned the 2nd rear end cursor in the retracted position. . It is the perspective view which showed the structure of the 2nd rear end cursor and side end control part of the paper feed cassette of 2nd Embodiment of this invention, and is the figure which showed the state which has arrange | positioned the 2nd rear end cursor in the protrusion position. .

  Embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
As shown in FIG. 1, the image forming apparatus 100 includes an apparatus main body (image forming apparatus main body) 1 and an image reading device 2 disposed on the upper portion thereof.

  In the image reading device 2, an image reading unit for reading image information of a document on the contact glass 2a is provided. The image reading unit includes a scanner lamp that illuminates the document during copying, a scanning optical system equipped with a mirror that changes the optical path of reflected light from the document, a condensing lens that focuses the reflected light from the document, And a CCD sensor or the like (not shown) that converts the imaged image light into an electrical signal, and reads a document image and converts it into image data.

  An operation panel 3 having operation buttons and a display unit is provided on the front portion of the image reading apparatus 2. A platen (not shown) that presses the document placed on the contact glass 2a is provided on the upper part of the image reading device 2 so as to be opened and closed. On the platen, an automatic document feeder (not shown) may be provided that automatically and sequentially feeds one document at a time from the document bundle onto the contact glass 2a.

  Between the image reading apparatus 2 and the apparatus main body 1, an in-body discharge space 4 is provided that is largely open toward the left side and the front.

  A plurality (two in this case) of paper feed cassettes (sheet storage cassettes) 10 for storing paper (sheets) P (see FIG. 2) are detachably attached to the main body 1 of the apparatus main body 1. It has been.

  As shown in FIG. 2, an image forming unit 101, a fixing unit 102, a sheet conveying unit 103, and the like are provided inside the apparatus main body 1. The image forming unit 101 forms an image by transferring a toner image to the supplied paper P based on the image data read by the image reading device 2. The image forming unit 101 includes a photosensitive drum 104 that carries an electrostatic latent image, a charging unit 105 that charges the surface of the photosensitive drum 104, and an electrostatic latent image corresponding to a document image on the surface of the photosensitive drum 104 with a laser beam. For example, an exposure unit 106 formed by, for example, a developing unit 107 that forms a toner image by attaching a developer to the formed electrostatic latent image, a transfer roller 108 that transfers the toner image onto the paper P, and a residual surface of the photosensitive drum 104 A cleaning blade 109 for removing toner is included. The fixing unit 102 fixes the toner image on the paper P by heating and pressing the paper P on which the toner image is transferred. The paper transport unit 103 extends upward along the right side surface of the apparatus main body 1, and transports the paper P from the paper feed cassette 10 to the image forming unit 101.

  Next, the configuration of the paper feed cassette 10 will be described.

  The paper feed cassette 10 is detachably attached to the cassette mounting portion 1a of the apparatus main body 1. As shown in FIGS. 3 and 4, the paper feed cassette 10 is formed in a flat, substantially box shape in which side walls 12 a to 12 d are erected on the peripheral edge of the bottom surface portion 11 and the upper surface is opened. Is loaded and accommodated. A sheet accommodating portion (sheet accommodating portion) S for accommodating the sheet P is formed by the bottom surface portion 11 and the side walls 12a to 12d. In the drawing, the insertion direction of the sheet cassette 10 with respect to the apparatus main body 1 is indicated by an arrow A, the drawing direction is indicated by an arrow A ′, and the sheet feeding direction (sheet feeding direction) of the sheet cassette 10 is indicated by an arrow B. .

  A cassette cover 14 is mounted on the side wall 12a on the upstream side with respect to the insertion direction of the paper feed cassette 10. The cassette cover 14 has a front surface exposed to the outside and constitutes a part of an exterior surface of the apparatus main body 1 (see FIG. 1).

  The paper storage unit S is provided with a paper stacking plate (sheet stacking plate) 16 on which the paper P is stacked. The sheet stacking plate 16 is fed with pivot shafts (not shown) provided at both ends of the sheet width direction (sheet width direction, arrow AA ′ direction) at the upstream side in the sheet feeding direction (arrow B ′ direction). An end portion on the downstream side in the paper direction (in the direction of arrow B) is provided so as to be movable up and down with respect to the bottom surface portion 11 by a coil spring (not shown). The sheet P stacked on the sheet stacking plate 16 is conveyed only by the topmost sheet by a pickup roller, a feed roller, and a retard roller (all not shown) provided in the apparatus main body 1 (see FIG. 1). Is done.

  On both sides of the sheet stacking plate 16 in the sheet width direction (arrow AA ′ direction), a pair of width alignment cursors 20 (20a and 20b) for positioning the sheet P stacked on the sheet stacking plate 16 in the width direction are provided. Yes. The width alignment cursors 20a and 20b are provided so as to be reciprocally movable along a width direction guide slit formed on the bottom surface portion 11 and extending in the sheet width direction.

  A first rear end cursor 30 for aligning the rear ends of the sheets P stacked on the sheet stacking plate 16 is provided on the upstream side in the paper feeding direction of the sheet stacking plate 16 (arrow B ′ direction). The first rear end cursor 30 is provided so as to be capable of reciprocating along a paper feed direction guide slit 11a formed on the bottom surface portion 11 and extending in the paper feed direction.

  Further, the paper stacking plate 16 is provided with a notch in the movement area of the width alignment cursors 20 a and 20 b and the first rear end cursor 30.

  Guide rails 18 are attached to the outer sides of the side walls 12b and 12d parallel to the insertion or withdrawal direction (arrow AA 'direction) of the paper feed cassette 10. The apparatus main body 1 is provided with a rail support portion (not shown) that slidably supports the guide rail 18. By sliding the guide rail 18 along the rail support portion, the paper feed cassette 10 is provided. The device main body 1 can be inserted and pulled out.

  Each of the width alignment cursors 20a and 20b is parallel to the bottom surface portion 11 and has a base portion 21 on which the vicinity of the end portion in the width direction of the paper P is stacked. And a side end regulating portion 22 that abuts. A rack portion 23 that is disposed inside the bottom surface portion 11 and extends along the paper width direction is connected to each of the width alignment cursors 20a and 20b via a connecting portion (not shown). A connecting portion (not shown) connects the lower portion of the base portion 21 and the end portion of the rack portion 23.

  Rack teeth extending in the sheet width direction are formed on the opposite surfaces of each rack portion 23 in the sheet feeding direction. The rack teeth of each rack portion 23 are engaged with pinion teeth of a pinion gear (not shown) that is rotatably mounted at a position below the sheet stacking plate 16 of the bottom surface portion 11. A rack and pinion mechanism is configured by the rack portion 23 and a pinion gear (not shown).

  The pinion gear (not shown) can be rotated in accordance with the movement of the rack portion 23. When one width alignment cursor 20a (or 20b) is moved in the paper width direction, the pinion gear (not shown) rotates. In conjunction with this, the other width alignment cursor 20b (or 20a) also moves by the same amount in the opposite direction. That is, the width alignment cursors 20a and 20b move symmetrically with respect to the center line in the paper width direction.

  The first rear end cursor 30 is parallel to the bottom surface portion 11 and has a base portion 31 on which the vicinity of the upstream end of the paper P in the paper feeding direction is stacked, and is erected from the base portion 31 and upstream of the paper P in the paper feeding direction. And a rear end restricting portion 32 that comes into contact with the end portion on the side. Note that the first rear end cursor 30 positions the rear end portion of the paper P having a maximum size (for example, A4 size) stacked in the paper storage unit S or a slightly smaller size (for example, B5 size).

  Here, in the present embodiment, each of the pair of width alignment cursors 20a and 20b has a paper size (for example, A5 size, A6 size, postcard size) smaller than the paper P on which the first rear end cursor 30 is positioned. A second rear end cursor 40 for positioning the rear end portion of P is provided. Since the second rear end cursor 40 provided in the width alignment cursors 20a and 20b is formed symmetrically in the paper width direction, the second rear end cursor 40 provided in the width alignment cursor 20a is illustrated here. The description will be given with reference.

  As shown in FIGS. 5 and 6, the side end regulating portion 22 of the width alignment cursor 20 a has a side end abutting surface 22 a that abuts on the side end portion (end portion in the width direction) of the paper P. The side end abutting surface 22a is provided with a cursor accommodating portion 24 for accommodating the second rear end cursor 40.

  As shown in FIG. 7, the second rear end cursor 40 has a rotating shaft portion 41 that protrudes in the vertical direction, and a rear end contact surface 40 a that contacts the rear end portion of the paper P. The second rear end cursor 40 is arranged in the width alignment cursor 20a so that the rotation shaft portion 41 is on the upstream side in the sheet feeding direction (left side in FIG. 5), and the width alignment is performed around the rotation shaft portion 41. It is provided so as to be rotatable with respect to the cursor 20a. The second rear end cursor 40 is disposed inside the cursor accommodating portion 24, and has a retracted position (a position shown in FIG. 5) that does not contact the rear end portion of the paper P and the paper width beyond the side end contact surface 22a. And a protruding position (position in FIG. 6) that protrudes inward in the direction and can contact the rear end of the paper P.

  In the retracted position (position in FIG. 5), the rear end contact surface 40a is disposed in parallel with the side end contact surface 22a, and the second rear end cursor 40 is disposed flush with the side end contact surface 22a. The The second rear end cursor 40 may be disposed outside the side end contact surface 22a in the paper width direction at the retracted position. Further, at the protruding position (the position in FIG. 6), the rear end contact surface 40a is disposed perpendicular to the side end contact surface 22a and protrudes inward in the paper width direction from the side end contact surface 22a. .

  The second rear end cursor 40 is formed in a substantially rectangular parallelepiped shape. On the upper surface and the lower surface of the second rear end cursor 40, an upper projecting portion (projecting portion) 42a projecting upward, and projecting downward. A lower protrusion (protrusion) 42b is provided.

  Further, a cutout portion 43 is formed at the end of the second rear end cursor 40 so as to be cut out toward the back side of the rear end contact surface 40a, and the second rear end cursor 40 is changed from the retracted position to the protruding position. The user's finger is engaged. A chamfered chamfered portion 44 (see FIG. 11) is formed on a portion of the second rear end cursor 40 on the rotating shaft 41 side and on the rear end contact surface 40a side.

  As shown in FIG. 8, the cursor accommodating portion 24 of the width alignment cursor 20 a is formed in a substantially T shape like the second rear end cursor 40. An insertion recess 24a into which a user's finger is inserted when the second rear end cursor 40 is changed from the retracted position to the protruding position is provided in a portion of the cursor accommodating portion 24 that faces the notch 43 of the rear end cursor 40. Is provided.

  Further, the cursor housing portion 24 is formed so as to extend in the paper feeding direction (arrow B direction), and the rotation shaft portion 41 of the second rear end cursor 40 is inserted, and the rotation shaft portion 41 is fed. Guide grooves 26 are provided to guide the guides slidably along the direction. The guide groove 26 is provided on both the upper surface and the lower surface of the cursor housing portion 24.

  As shown in FIGS. 8 and 9, the inner side surface (a surface parallel to the side end contact surface 22 a) 24 b of the cursor housing portion 24 is engaged with the second rear end cursor 40, and the second rear end cursor 40 is engaged. One or more (three in this case) engaging portions 28 are provided to restrict movement along the paper feeding direction. The plurality of engaging portions 28 are arranged along the paper feeding direction at a position corresponding to the rear end portion of the standard size paper P. As shown in FIGS. 9 and 10, a U-shaped slit 24 c is provided around the engaging portion 28. The engaging portion 28 is elastically deformable in the paper width direction (arrow AA ′ direction) and protrudes inward in the paper width direction (arrow A ′ direction) from the leading end of the elastic portion 28a. 40, and a protrusion 28b that engages with the protrusion 40b.

  In this paper feed cassette 10, when a paper P of a predetermined size or larger (for example, A4 size, B5 size) is set in the paper storage unit S, the side edge of the paper P is set by the width alignment cursors 20 a and 20 b and the first rear end cursor 30. Position the rear and rear ends. In this case, the second rear end cursor 40 is arranged at the retracted position (position in FIG. 5).

  On the other hand, when the paper P of a size less than a predetermined size (for example, A5 size, A6 size, postcard size) is set in the paper storage unit S, the side edge portion of the paper P and the width alignment cursors 20a and 20b and the second rear end cursor 40 Position the rear end. In this case, first, as shown in FIGS. 6 and 11, the second rear end cursor 40 is protruded from the cursor accommodating portion 24. Then, the width alignment cursors 20a and 20b are moved inward in the paper width direction, and the side edge regulating portion 22 positions the side edge of the paper P. Thereafter, as shown in FIG. 12, the rear end portion of the paper P is positioned by moving the second rear end cursor 40 in the paper feeding direction according to the size of the paper P stored in the paper storage portion S. . At this time, since the engaging portion 28 is pressed by the chamfered portion 44 of the second rear end cursor 40 and elastically deforms outward in the paper width direction, the second rear end cursor 40 can be easily moved in the paper feeding direction. .

  In the state of FIG. 12, the second rear end cursor 40 is applied with a force that rotates clockwise by the rear end portion of the paper P, but the arrow on the end surface 40 b that faces the inner side surface 24 b of the second rear end cursor 40. Since the portion in the B ′ direction contacts the inner side surface 24b of the cursor housing portion 24, the clockwise rotation of the second rear end cursor 40 is restricted.

  When returning the second rear end cursor 40 from the state shown in FIG. 12 to the retracted position, the second rear end cursor 40 is rotated by a predetermined angle as shown in FIG. As a result, the second rear end cursor 40 is disengaged from the engaging portion 28, and thus the second rear end cursor 40 is moved upstream in the paper feeding direction while maintaining the angle of the second rear end cursor 40. Then, it is rotated around the rotation shaft 41 and returned to the retracted position shown in FIG.

  In the present embodiment, as described above, the positioning is performed by contacting the rear end portion of the paper P that is provided on the width alignment cursors 20a and 20b and the first rear end cursor 30 is smaller than the paper P to be positioned. A second rear end cursor 40 is provided. Thus, the first rear end cursor 30 and the second rear end cursor 40 can be used properly according to the paper size. That is, it is not necessary to use the first trailing edge cursor 30 for all the sizes of paper P from the maximum size to the minimum size. For this reason, since the sheet feeding direction guide slit 11a provided in the bottom surface portion 11 of the sheet feeding cassette 10 can be reduced, it is possible to suppress the rigidity of the sheet feeding cassette 10 from being lowered. As a result, it is possible to prevent the paper feed cassette 10 from being twisted, and thus it is possible to suppress the occurrence of paper feed defects such as skew of the paper P (diagonal paper feed).

  In addition, as described above, the side end regulating portion 22 is provided with the cursor accommodating portion 24 that accommodates the second rear end cursor 40 by providing the side end abutting surface 22a in a recessed manner. Thereby, the arrangement space of the second rear end cursor 40 can be easily ensured without increasing the size of the paper feed cassette 10.

  Further, as described above, the cursor accommodating portion 24 extends in the paper feeding direction, has the pair of guide grooves 26 into which the rotation shaft portion 41 is inserted, and the rotation shaft portion 41 is slidable. The rear end cursor 40 is supported at the protruding position so as to be slidable along the paper feeding direction. Accordingly, the rear end portion can be easily positioned with respect to the plurality of sizes of paper P.

  As described above, the second rear end cursor 40 is provided so as to be rotatable with respect to the side end regulating portion 22. As a result, the second rear end cursor 40 can be easily brought into contact with the rear end portion of the paper P at the protruding position without being brought into contact with the rear end portion of the paper P at the retracted position. Further, the length of the second rear end cursor 40 in the paper width direction can be easily increased in a state where the second rear end cursor 40 is disposed at the protruding position.

  In addition, as described above, the second rear end cursor 40 is provided with the upper protruding portion 42a and the lower protruding portion 42b that protrude in the vertical direction from the upper surface and the lower surface. As a result, the second rear end cursor 40 can be easily brought into contact with all the sheets P (from the lowermost sheet P to the uppermost sheet P) stacked on the sheet stacking plate 16.

(Second Embodiment)
In the paper feed cassette 10 according to the second embodiment of the present invention, as shown in FIGS. 14 and 15, the second rear end cursor 40 is rotatable about a hinge 50 provided at the rear end of the width alignment cursor 20. It is supported. The second rear end cursor 40 extends on the extended surface of the side end contact surface 22a at the retracted position (position in FIG. 14), and constitutes a part of the side end contact surface 22a. Further, the second rear end cursor 40 extends in the vertical direction from the side end contact surface 22a toward the inner side at the protruding position (position in FIG. 15).

  A protrusion 45 is provided on the lower surface of the second rear end cursor 40 so as to protrude downward. The protrusion 45 engages with a recess (not shown) provided in the bottom surface portion 11 (or the base portion 21 of the width alignment cursor 20) at the protruding position. Thereby, the 2nd rear end cursor 40 can be hold | maintained in a protrusion position.

  Other structures and effects of the second embodiment are the same as those of the first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above-described embodiment, the example in which the second rear end cursor 40 is provided on both the width alignment cursors 20a and 20b has been described. However, the present invention is not limited to this, and the second rear end cursor 40 is not limited to the width alignment cursor 20a. And 20b may be provided only on one side.

DESCRIPTION OF SYMBOLS 1 Apparatus main body 1a Cassette mounting part 10 Paper feed cassette (sheet storage cassette)
16 Paper loading plate (sheet loading plate)
20, 20a, 20b Width adjusting cursor 22 Side end regulating portion 22a Side end contact surface 24 Cursor housing portion 26 Guide groove 28 Engaging portion 30 First rear end cursor 40 Second rear end cursor 40a Rear end contact surface 41 times Moving shaft part 42a Upper protrusion (protrusion)
42b Lower protrusion (protrusion)
100 Image forming apparatus P Paper (sheet)
S Paper storage unit (sheet storage unit)

Claims (7)

A sheet storage cassette that is detachable from a cassette mounting portion of the apparatus body,
A sheet accommodating portion for accommodating the sheet;
A sheet stacking plate on which a portion on the upstream side in the sheet feeding direction is rotatably supported by the sheet storage unit, and a sheet is stacked on the upper surface;
A width alignment cursor that is movable in the sheet width direction perpendicular to the sheet feeding direction on the bottom surface of the sheet storage unit, and that contacts and positions the side edges of the sheets stacked on the sheet stacking plate;
A first rear end cursor that is movable in the sheet feeding direction on the bottom surface of the sheet storage unit and that is positioned in contact with the rear end portion of the sheet;
A second rear end cursor that is provided in the width alignment cursor and that performs positioning by contacting a rear end portion of a sheet having a smaller size than a sheet on which the first rear end cursor is positioned;
With
The width alignment cursor includes a side end regulating portion having a side end abutting surface that abuts on a side end of the sheet,
The second rear end cursor is disposed along the side end abutting surface and protrudes inward in the sheet width direction from the retreat position where the second rear end cursor does not abut the rear end portion of the sheet and the side end abutting surface. A sheet storage cassette, wherein the sheet storage cassette is selectively disposed at a protruding position capable of contacting a rear end portion of the sheet.   2. The sheet storage according to claim 1, wherein the side end regulating portion is provided with a cursor storage portion for receiving the second rear end cursor by recessing the side end contact surface. cassette. The second rear end cursor is supported by the side end restricting portion so as to be rotatable between the retracted position and the protruding position around a rotating shaft portion protruding in the vertical direction.
The cursor housing portion extends in the sheet feeding direction, has the pair of guide grooves into which the pivot shaft portion is inserted, and the pivot shaft portion can slide.
The sheet storage cassette according to claim 2, wherein the second rear end cursor is slidably supported along the sheet feeding direction at the protruding position. The second trailing edge cursor has a trailing edge contact surface that contacts the trailing edge of the sheet,
The sheet storage cassette according to any one of claims 1 to 3, wherein the rear end contact surface is disposed perpendicular to the side end contact surface at the protruding position.   The second rear end cursor is rotatably supported at the rear end of the width alignment cursor, and extends on an extended surface of the side end contact surface at the retracted position, and is a part of the side end contact surface. The sheet storage cassette according to claim 1, wherein the sheet storage cassette extends in a vertical direction from the side end abutting surface toward the inside at the protruding position.   5. The sheet storage cassette according to claim 4, wherein the second rear end cursor has a substantially rectangular parallelepiped shape and is provided with a protruding portion that protrudes in a vertical direction from each of an upper surface and a lower surface.   An image forming apparatus comprising: the sheet storage cassette according to claim 1; and an image forming unit.

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