JP4495080B2 - Paper post-processing device - Google Patents

Description

  The present invention relates to a sheet post-processing apparatus and a sheet post-processing method for performing post-processing of paper discharged from an image forming apparatus such as a copying machine, a printer, or a multifunction peripheral.

In recent years, in an image forming apparatus, in order to perform post-processing of sheets such as sorting or stapling of sheets after image formation, a sheet post-processing apparatus is provided adjacent to a paper discharge unit of the main body of the image forming apparatus. There is something to provide. In such a paper post-processing apparatus, the post-processing of the succeeding paper is performed after completion of the post-processing of the preceding paper. In order to wait for the subsequent sheet discharged from the main body of the image forming apparatus as described above, there is a conventional apparatus that provides a retreat path in the middle of a path reaching a staple, for example. (For example, refer to Patent Document 1.)
Japanese Patent Publication No. 6-99070 (6th page, FIG. 2)

  However, as in (Patent Document 1), when a retracting path is provided in the middle of reaching the staple, the conveyance path from the discharge portion of the image forming apparatus main body to the staple becomes long, and the downsizing of the apparatus is hindered. Was produced. Further, in the paper post-processing device, when the paper is vertically aligned using the inclination of the paper discharge tray, when the paper placed on the paper discharge tray increases, the weight of the paper supports the rear edge of the paper. The tray rib is deformed. For this reason, there is a possibility that the vertical alignment of the paper is deteriorated. In addition, when the deformed tray rib comes into contact with the shaft of the discharge mechanism such as the paper discharge roller or the paper discharge belt, a contact sound may be generated or the motor may be stepped out as a brake of the motor that drives the discharge mechanism. .

  Therefore, the present invention solves the above-described problems, and can reduce the distance from the paper discharge unit of the image forming apparatus to the processing mechanism that performs post-processing, and can be downsized. An object of the present invention is to provide a sheet post-processing apparatus that restricts deformation of a tray rib that supports the rear end of a sheet.

As a means for solving the above problems, the sheet post-processing apparatus of the present invention, a paper discharge tray sheet over bets tip is inclined so as to be higher than the sheet trailing edge, the shaft adjacent to the discharge tray The sheet is rotated in conjunction with the sheet discharge mechanism for discharging the sheet to the sheet discharge tray, and is arranged at the shaft side end of the sheet discharge tray to support and align the trailing end of the sheet on the sheet discharge tray. A rear end support, and a rib receiving member attached to the shaft at a position facing the rear end support and abutting on the rear end support.

  According to the present invention, a standby tray for waiting for a sheet is provided above the processing tray for performing post-processing, and the standby sheet is dropped and supplied to the treatment tray. Accordingly, the distances occupied by the standby tray and the processing tray in the apparatus can be overlapped, and the substantial conveyance path from the paper discharge unit of the image forming apparatus main body to the processing mechanism for performing post-processing can be shortened. Miniaturization can be obtained.

Further, a rib receiving member that contacts the rear end support of the paper discharge tray is attached to the shaft of the discharge mechanism. Accordingly, even if the rear end support is heavy due to the increase in the number of sheets, the rear end support is limited in deformation by being supported by the rib receiving member on the back surface. Thereby, the vertical alignment of the paper on the paper discharge tray can be improved regardless of the amount of paper. Further, it is possible to prevent noise caused by deformation of the rear end support and to prevent the motor from stepping out.

  In the present invention, a rib receiving member that supports the tray rib is attached to the shaft of the discharge mechanism at a position facing the tray rib.

Embodiments of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view showing a main part of a paper post-processing apparatus 7 according to the present invention, FIG. 2 is a top view of the main part of the paper post-processing apparatus, and FIG. 3 is a rear side of a paper placed adjacent to an image forming apparatus 5 such as a copying machine. FIG. 3 is a schematic configuration diagram showing a processing device 7. The paper post-processing device 7 includes a pair of entrance rollers 22 that take in the paper P, which is a sheet formed by the image forming device 5 and discharged from the pair of paper discharge rollers 6, into the paper post-processing device 7. The entrance roller 22 is driven by an entrance roller motor 26. A fixed tray 70 is provided on the upper surface of the sheet post-processing device 7. The fixed tray 70 has an inclination in which the front end of the paper P placed on the fixed tray 70 is higher than the rear end. Adjacent to the paper discharge port 71 of the fixed tray 70, a pair of paper discharge rollers 76 and 77 which are discharge mechanisms and sandwich and convey the paper P are provided. A fixed tray path 74 that guides the paper P to the paper discharge rollers 76 and 77 is provided between the entrance roller 22 and the paper discharge port 71.

  As shown in FIG. 10, a plurality of rubber rollers 77 a that rotate in conjunction with the shaft 78 are attached to the shaft 78 of the lower paper discharge roller 77. As shown in FIG. 11, below the paper discharge port 71, a plurality of tray ribs 80 that are rear end supports that support the rear end of the paper P are provided. The fixed tray 70 and the tray rib 80 are integrally formed. A sensor 81 that detects the fullness of the paper P on the fixed tray 70 is attached above the paper discharge port 71.

  A collar 82, which is a rib receiving member made of polyacetal, is attached to the shaft 78 at a position facing the tray rib 80. The collar 82 is free with respect to the shaft 78. The collar 82 contacts the tray rib 80 and supports the back surface of the tray rib 80. The collar 82 is not disposed so as to face all of the plurality of tray ribs 80 but is provided only at a necessary portion.

  A standby tray 10 is provided below the fixed tray 70. A paper path ceiling 36 that guides the paper P to the pair of paper feed rollers 24 is provided between the entrance roller 22 and the standby tray 10. Below the standby tray 10 is disposed a processing tray 12 on which the sheets P dropped from the standby tray 10 are stacked.

  The processing tray 12 aligns and supports the stacked sheets while the sheets P are stapled by the stapler 14 that is a processing mechanism that performs post-processing. As shown in FIG. 4, the stapler 14 can be slid in the direction of the arrow u by the staple driving unit 49. The stapler 14 is rotated and positioned in accordance with the staple direction, and the staple processing is controlled. The processing tray 12 includes a pair of upper and lower upper and lower alignment rollers 38a and 38b that align a plurality of sheets P dropped and supplied from the standby tray 10 in the vertical direction that is the conveyance direction. The vertical and vertical alignment rollers 38a and 38b shown in FIG. 5 also serve as bundle conveying rollers that pinch the sheet bundle T after completion of the stapling process and take it out of the stapler 14. The upper vertical alignment roller 38 a is driven by the vertical alignment upper roller motor 40. The lower vertical alignment roller 38b is driven by a vertical alignment lower roller motor 42.

  A paddle 44 placed on the processing tray 12 is disposed at a position where the trailing edge of the paper P falls when the paper P is dropped and supplied to the processing tray 12. The paddle 44 is rotatable and aligns the uppermost sheet P in the vertical direction. As shown in FIG. 6, the paddle 44 aligns the receiving portion 44 a of the paper P that is dropped and supplied onto the processing tray 12, the punching portion 44 b that scrapes off the paper P on the processing tray 12, and the paper P on the processing tray 12. It has a feed part 44c. The paddle 44 is driven by a paddle motor 46. The paddle 44 is made of a rubber material and has elasticity.

  A stopper 45 is provided at the end of the processing tray 12 on the side of the stapler 14 to abut the rear end of the paper P and regulate the rear end position. A conveyance belt 50 is provided in the approximate center of the processing tray 12. The conveyance belt 50 is stapled and conveys the sheet bundle T taken out from the stapler 14 by the vertical and vertical alignment rollers 38a and 38b to the first or second paper discharge trays 16 and 18. A feed claw 50 a that hooks the rear end of the sheet bundle T is attached to the transport belt 50.

  The standby tray 10 can drop and supply the paper P to the processing tray 12. On the other hand, the standby tray 10 can convey the paper P in the direction of the first or second paper discharge tray 16 or 18. The conveyance of the paper P in the direction of the paper discharge trays 16 and 18 is performed by bringing the standby tray roller 28 that aligns the paper P into contact with the paper P on the standby tray 10. The standby tray roller 28 is controlled to move up and down by a standby tray roller drive source 30 and is driven to rotate by a standby tray roller motor 32.

  The standby tray 10 is disposed with an inclination in which the leading edge of the paper P is higher than the trailing edge. As shown in FIGS. 7 and 8, the standby tray 10 includes a pair of tray members 10a and 10b. The tray members 10a and 10b receive the paper while sliding to the width of the paper P and support both sides of the paper P. The tray members 10a and 10b are provided with standby stoppers 10c and 10d for regulating the rear end of the paper P.

  The standby tray 10 is slid by the standby tray motor 34. Between the standby tray 10 and the processing tray 12, the lateral alignment plates 47a and 47b shown in FIG. 9 are provided. When the paper P on the standby tray 10 is dropped and supplied to the processing tray 12, the horizontal alignment plates 47a and 47b prevent the paper P from being disturbed in the horizontal direction perpendicular to the transport direction and perform horizontal alignment. The lateral alignment plates 47a and 47b are formed to be slidable in the direction of the arrow v so as to match the width of the paper P by the lateral alignment motor 48.

  The first or second paper discharge tray 16 or 18 is lifted or lowered by the paper discharge tray driving unit 52 to select either one. The first or second paper discharge trays 16 and 18 are raised and lowered to substantially the same height as the standby tray 10 or the processing tray 12 when the paper P is stacked to improve the consistency of the paper P to be discharged. The first or second paper discharge trays 16 and 18 are disposed with an inclination in which the leading edge of the paper P is higher than the trailing edge. Guides 86 and 87 for supporting the rear end of the paper P placed on the first or second paper discharge trays 16 and 18 are provided below the discharge portion of the standby tray 10 or the processing tray 12, respectively. .

  Next, the operation will be described. When an image is formed by the image forming apparatus 5 and the paper P is supplied from the paper discharge roller 6, the paper post-processing device 7 performs the post-processing when the paper P is post-processed or not. Different operations are performed depending on whether the process is being executed or the post-processing is finished.

  When paper is discharged to the fixed tray 70 without post-processing, the paper discharged from the paper discharge roller 6 of the image forming apparatus 5 is transferred to the paper discharge rollers 76 and 77 via the tray path 74 by the entrance roller 22. It is conveyed and discharged to the fixed tray 70. At this time, the fixed tray 70 is disposed so as to be inclined so that the front end side of the paper P is higher than the rear end side. As a result, the sheet P returns to the arrow x direction, which is the sheet rear end direction, by using the inclination of the fixed tray 70, and the rear end abuts against the tray rib 80 and is vertically aligned. Similarly, the sheets P discharged from the image forming apparatus 5 are sequentially discharged to the fixed tray 70 and vertically aligned until a predetermined number of sheets are reached.

  When the number of sheets P stacked on the fixed tray 70 and vertically aligned increases, the force in the direction of the arrow w that the tray rib 80 receives from the sheet P increases due to the weight of the sheet P. For this reason, the tray rib 80 may be gradually deformed in the direction indicated by the dotted line in FIG. 3 when there is no support.

  However, in this embodiment, the collar 82 is in contact with the back surface of the tray rib 80 to support the tray rib 80. Accordingly, the tray rib 80 is not greatly deformed regardless of the weight of the sheets P stacked on the fixed tray 70. That is, regardless of the increase in the number of sheets P placed on the fixed tray 70, the tray rib 80 can satisfactorily vertically align the sheets P. Further, the tray rib 80 is not greatly deformed, and a contact sound with the shaft 78 can be prevented. Further, the brake of the shaft 78 is not caused, and the motor can be prevented from being stepped out. During this time, when the paper P is full on the fixed tray 70 and the sensor 81 detects that the paper is full, the discharge to the fixed tray 70 is interrupted, and a warning that the fixed tray 70 is full is displayed on the display panel or the like. Made.

  Next, in the case where no post-processing is performed and paper is discharged to the first or second paper discharge trays 16 and 18, for example, the first paper discharge tray 16 slides to a position indicated by a dotted line in FIG. ing. As a result, the first paper discharge tray 16 can stack the paper P discharged from the standby tray 10 with good consistency. When no post-processing is performed, the paper P conveyed from the entrance roller 22 to the paper feed roller 24 through the paper path ceiling 36 is fed to the standby tray 10 by the paper feed roller 24. Next, the paper P is transported by the standby tray roller 28 that is lowered onto the standby tray 10 and rotated in the direction of the arrow f, and is discharged onto the first paper discharge tray 16.

  In this way, the sheets are sequentially stacked on the first paper discharge tray 16. At this time, since the first paper discharge tray 16 is inclined so that the leading end side of the paper P is higher than the rear end side, the paper placed on the first paper discharge tray 16 in advance. P is not pushed out by contact with the leading edge of the succeeding paper P. That is, the discharged paper P is sequentially placed on the first paper discharge tray 16 without being out of order. Further, since the first paper discharge tray 16 is inclined, even if the preceding paper P is pushed by the succeeding paper P and is slightly misaligned, the paper P falls to the rear end side by its own weight. . As a result, the paper P is stacked on the first paper discharge tray 16 with its rear end in contact with the guide 86 and vertically aligned, and the paper P is completely discharged.

  Next, a case where a stapling process, which is a post-process, is performed and there is no sheet P on which the stapling process is being executed prior to the processing tray 12 will be described. At this time, the standby tray 10 slides the tray members 10a and 10b to the positions indicated by the dotted lines in FIG. The horizontal alignment plates 47a and 47b are arranged so that the width between the horizontal alignment plates 47a and 47b is substantially the same as the width of the paper P in order to align the horizontal direction of the paper P dropped from the paper feed roller 24. Thereby, the paper P fed by the paper feed roller 24 is dropped and supplied directly onto the processing tray 12 without being interrupted by the standby tray 10.

  At the time of dropping, the upper vertical alignment roller 38a is retracted upward, and the receiving portion 44a of the paddle 44 receives the rear end of the paper P. Both sides of the paper P fall while contacting the horizontal alignment plates 47a and 47b, and are aligned in the horizontal direction. Next, the paddle 44 rotates in the direction of the arrow o, the trailing edge of the paper P is dropped from the receiving portion 44a, and is knocked onto the processing tray 12 by the knocking portion 44b. Further, the paddle 44 feeds the paper P in the direction of the arrow q by the feeding portion 44c, and the rear end of the paper P is brought into contact with the stopper 45 to complete the vertical alignment of the paper P. The vertical alignment of the paper P on the processing tray 12 may be performed by the upper vertical alignment roller 38a by moving the upper vertical alignment roller 38a up and down each time.

  In this way, the image-formed sheets P are stacked directly on the processing tray 12 from the sheet feed roller 24 while sequentially aligning in the horizontal and vertical directions. When the number of sheets P reaches a predetermined number, the stapler 14 staples the sheets P on the processing tray 12 at a desired position to form a bundle of sheets T. Thereafter, the upper vertical alignment roller 38a is lowered onto the sheet bundle. The sheet bundle T is pinched by the upper vertical alignment roller 38a rotating in the direction of the arrow r and the lower vertical alignment roller 38b rotating in the direction of the arrow s, and is conveyed in the direction of the first paper discharge tray 16. When the rear end of the sheet bundle T passes through the vertical and vertical alignment rollers 38 a and 38 b, the sheet bundle T is caught on the feed claw 50 a of the conveyance belt 50 rotated in the direction of the arrow t and discharged onto the first sheet discharge tray 16.

  At this time, the first paper discharge tray 16 is slid from the position indicated by the dotted line to the position indicated by the solid line in FIG. Further, since the first paper discharge tray 16 is inclined and the front end side of the paper P is higher than the rear end side, the paper bundled on the first paper discharge tray 16 in advance. P is not pushed out by contact with the leading end of the subsequent sheet bundle T. Even if the preceding sheet bundle T is slightly displaced by the succeeding sheet P, the sheet bundle T falls due to its own weight because the first paper discharge tray 16 is inclined. As a result, the sheet bundle T is stacked in a vertically aligned state with the rear end abutting the guide 87 on the first paper discharge tray 16, and the stapling process of the sheet bundle T is completed.

  Next, a case where a stapling process, which is a post-process, is performed, and a sheet P for which a stapling process is being executed prior to the processing tray 12 remains will be described. At this time, in the standby tray 10, the tray members 10 a and 10 b slide from the positions indicated by the dotted lines in FIG. 12 in the direction opposite to the arrow m direction or the direction opposite to the arrow n direction, respectively, and are indicated by solid lines in FIG. The paper P can be supported at the position shown. The standby tray roller 28 is retracted above the standby tray 10 so as not to interfere with the paper P. The paper P discharged from the image forming apparatus 5 and supplied by the paper supply roller 24 is temporarily placed on the standby tray 10 in order to wait for the processing tray 12 to become empty.

  The paper P placed on the standby tray 10 is sent in the directions of the standby stoppers 10c and 10d by the standby tray roller 28 that is lowered onto the standby tray 10 and rotated in the direction opposite to the arrow f direction. The paper P is vertically aligned with its rear end abutting against the standby stoppers 10c and 10d.

  Since the standby tray 10 is inclined, even if, for example, the paper P is curled in a mountain shape and supplied from the paper feed roller 24 to the standby tray 10, the standby tray 10 is preceded. The sheet P placed on the sheet P is not pushed out by contact with the leading end of the subsequent sheet P. That is, the supplied paper P is sequentially placed on the standby tray 10 without being out of order. Further, even if the preceding paper P is pushed by the succeeding paper P and is slightly misaligned, the paper P falls to the position where the trailing edge abuts against the standby stoppers 10c and 10d due to its own weight. Then, they are stacked in alignment with the rear end aligned on the standby tray 10.

  During this time, when the preceding paper P on the processing tray 12 is discharged to the first paper discharge tray 16 side and the processing tray 12 becomes empty, the standby tray 10 positions the tray members 10a and 10b as indicated by solid lines in FIG. From the position indicated by the one-dot chain line in FIG. 12 to the position indicated by the dotted line in FIG. 12 in the direction of arrow m or arrow n, respectively. As a result, for example, two sheets of paper P waiting on the standby tray 10 reach the position indicated by the one-dot chain line in FIG. 12 on the processing tray 12 from between the tray members 10a and 10b. Drop supplied. At this time, the interval between the lateral alignment plates 47a and 47b is arranged to be substantially the same width as the paper P. Accordingly, the sheet P dropped from the standby tray 10 is regulated in the lateral direction by being regulated by the lateral alignment plates 47a and 47b on both sides.

  The lower sheet P of the two sheets P dropped on the processing tray 12 is sent in the direction of the arrow q by the lower vertical alignment roller 38b rotated in the direction opposite to the direction of the arrow s, and the rear end of the sheet P is stopped by the stopper. 45, the vertical alignment of the paper P is completed. The upper sheet P of the two sheets P dropped on the processing tray 12 is sent in the direction of the arrow q by the upper vertical alignment roller 38a rotated in the direction opposite to the direction of the arrow r, and the trailing end of the sheet P is stopped at the stopper 45. The vertical alignment of the paper P is completed, and then the upper vertical alignment roller 38a is retracted upward.

  The third and subsequent sheets P ejected from the image forming apparatus 5 are directly dropped onto the processing tray 12 from between the tray members 10a and 10b without waiting on the standby tray 10. Thereafter, the third and subsequent sheets P are sequentially aligned on the sheet P loaded on the processing tray 12 by the paddle 44 first.

  When the number of sheets P stacked on the processing tray 12 reaches a predetermined number, the stapler 14 performs a stapling process to form a sheet bundle T. Thereafter, the sheet bundle T is conveyed in the direction of the first paper discharge tray 16 by the vertical and vertical alignment rollers 38a and 38b. Further, the trailing edge of the sheet bundle T is hooked on the feeding claw 50a of the conveying belt 50, and the sheet bundle T is discharged onto the first sheet discharge tray 16, completing the stapling process of the sheet P.

  In the present embodiment configured as described above, when stapling is performed after image formation and the preceding stapling on the processing tray 12 has not been completed, the stapling processing is performed above the processing tray 12. A standby tray 10 is provided to wait for the subsequent paper P. Then, after waiting for the processing tray 12 to become empty, the paper P waiting in the standby tray 10 is dropped and supplied to the treatment tray 16. Accordingly, the substantial conveyance path from the standby tray 10 to the processing tray 12 in the paper post-processing device 7 can be shortened, and the paper post-processing device can be downsized.

  The back surface of the tray rib 80 integrated with the fixed tray 70 is supported by the collar 82. Therefore, even if the paper P on the fixed tray 70 increases and the weight of the paper P is applied to the tray rib 80, the tray rib 80 can be prevented from being greatly deformed. As a result, good vertical alignment of the paper P can always be obtained on the fixed tray 70. In addition, it is possible to prevent the contact noise and the step-out of the drive motor that have been generated when the tray rib 80 which has been greatly deformed contacts the shaft of the paper discharge roller.

  The present invention is not limited to the above-described embodiment, and can be changed without changing the gist thereof. For example, the method of dropping and feeding sheets from the standby tray to the processing tray is not limited, and the standby tray is slid. Instead of rotating, paper on the standby tray may be dropped and supplied to the processing tray. The processing mechanism is not limited to a hole punching device as long as it is a post-processing applied to the sheet.

Further, the ratio of the rib receiving member attached to the rear end support is arbitrary, and may be within a range in which the rear end support is prevented from being greatly deformed and the paper can be satisfactorily vertically aligned on the paper discharge tray. . If necessary, a rib receiving member may be provided to face all of the plurality of rear end supports. Also, the paper discharge tray and the rear end support may not be integrated and may be molded separately, and the rib receiving member is also free with respect to the shaft of the discharge mechanism, so that the load from the rear end support is not increased. As long as it does not affect the driving of the shaft, the material and structure thereof are not limited.

Further, the paper discharge tray is not limited to a fixed tray and may be a movable paper discharge tray. For example, in a movable paper discharge tray, a discharge mechanism such as a paper discharge roller or a paper discharge belt is used to prevent a tray rib that abuts the trailing edge of the paper and vertically aligns the paper from being deformed by the weight of the paper. A rib receiving member for supporting the tray rib may be provided on the shaft.

It is a perspective view which shows the principal part of the paper post-processing apparatus of the Example of this invention. It is a top view which shows the principal part of the paper post-processing apparatus of the Example of this invention. It is a schematic block diagram which shows the paper post-processing apparatus of the Example of this invention. It is a perspective view which shows the stapler of the paper post-processing apparatus of the Example of this invention. It is explanatory drawing which shows the vertical alignment roller of the Example of this invention. It is a perspective view which shows the paddle of the Example of this invention. It is a schematic perspective view which shows the standby tray and processing tray of the Example of this invention. It is a top view which shows the standby tray and processing tray of the Example of this invention. It is a schematic perspective view which shows the horizontal alignment board and conveyance belt of the Example of this invention. It is a schematic perspective view which shows a part of a pair of paper discharge roller of the Example of this invention. It is a schematic perspective view which shows a part of upper surface of the paper post-processing apparatus of the Example of this invention. It is explanatory drawing which shows the movement of the standby tray of the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 5 ... Image forming apparatus 7 ... Paper post-processing apparatus 10 ... Standby tray 10a, 10b ... Tray member 10c, 10d ... Standby stopper 12 ... Processing tray 14 ... Stapler 16 ... First discharge tray 18 ... Second discharge tray 22 ... Entrance roller 24 ... Paper feed roller 28 ... Standby tray roller 36 ... Paper path ceiling 38a ... Upper vertical alignment roller 38b ... Lower vertical alignment roller 44 ... Paddle 45 ... Stopper 47 ... Horizontal alignment plate 50 ... Conveying belt 50a ... Feeding claw 70 ... Fixed tray 74 ... Tray path 76 ... Upper paper discharge roller 77 ... Lower paper discharge roller 77a ... Rubber roller 78 ... Shaft 80 ... Tray rib 81 ... Sensor 82 ... Color

Claims (10)

A discharge tray sheet over bets tip is inclined so as to be higher than the sheet trailing edge,
A discharge mechanism that rotates in conjunction with a shaft adjacent to the discharge tray and discharges the sheet to the discharge tray;
A rear end support that is disposed at the shaft side end of the paper discharge tray and supports and aligns the rear end of the sheet on the paper discharge tray;
A sheet post-processing apparatus, comprising: a rib receiving member attached to the shaft at a position facing the rear end support and abutting the rear end support. 2. The plurality of rear end supports are arranged at an end of the sheet discharge tray on the shaft side, and the rib receiving member faces at least one of the plurality of rear end supports. The paper post-processing device as described.   3. The sheet post-processing apparatus according to claim 1, wherein the discharge tray is a fixed tray fixed to the apparatus main body, and the fixed tray and the rear end support are integrally formed. The sheet post-processing apparatus according to claim 1, wherein the rib receiving member is made of resin . A standby tray for waiting for a sheet discharged from the image forming apparatus;
Wherein is disposed below the standby tray, a processing tray for stacking before Symbol sheet that will be dropped and fed from the waiting tray,
A processing mechanism for performing post-processing on the sheet on the processing tray;
A discharge tray inclined so that the leading edge of the sheet is higher than the trailing edge of the sheet;
A discharge mechanism that rotates in conjunction with a shaft adjacent to the discharge tray and discharges the sheet to the discharge tray;
A rear end support that is disposed at the shaft side end of the paper discharge tray and supports and aligns the rear end of the sheet on the paper discharge tray;
A sheet post-processing apparatus, comprising: a rib receiving member attached to the shaft at a position facing the rear end support and abutting the rear end support. The plurality of rear end supports are arranged at the shaft side end of the paper discharge tray, and the rib receiving member faces at least one of the plurality of rear end supports. The paper post-processing apparatus according to 4.   6. The paper post-processing apparatus according to claim 4, wherein the paper discharge tray is a fixed tray fixed to the apparatus main body, and the fixed tray and the rear end support are integrally formed. The sheet post-processing apparatus according to claim 5, wherein the rib receiving member is made of resin .   6. The standby tray includes at least a pair of tray members that respectively support both sides of the sheet, and slides the tray member to drop and supply the sheet to the processing tray. The paper post-processing apparatus according to any one of 8. 6. The standby tray includes at least a pair of tray members that respectively support both sides of the sheet, and rotates and moves the tray member to drop and supply the sheet to the processing tray. The paper post-processing apparatus according to any one of 8.

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