JP2000211794A - Sheet processing apparatus and image forming apparatus having the same - Google Patents

Abstract

(57) Abstract: In a sheet processing apparatus, the present invention appropriately performs widthwise alignment of sheets conveyed and stacked on a sheet stacking unit. SOLUTION: When aligning a sheet P conveyed by a conveying roller pair 5 and stacked on an alignment tray 8 in a width direction by an alignment plate 26, the number of alignments (A) of the alignment plate 26 for each sheet to be stacked; Number of alignments performed when the last sheet is loaded (B)
By controlling so that (A) <(B), the consistency of the sheet bundle and the consistency at the time of the binding process by the stapling device 32 are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet processing apparatus for aligning and binding a sheet bundle and an image forming apparatus having the same.

[0002]

2. Description of the Related Art Heretofore, there has been a sheet binding apparatus (sheet processing apparatus) for aligning a plurality of sheets and binding one end of the sheet bundle as described below. The sheet on which the image is formed by the image forming apparatus main body is discharged at a predetermined timing from a predetermined main body discharge port of the image forming apparatus main body. The sheet is received from the receiving port of the sheet binding device, and the sheet conveying rollers nip and convey the sheet. After that, a predetermined number of sheets are aligned and stacked on a sheet stacking unit that temporarily stores sheets to be stapled. When a predetermined number of sheets accumulate in the sheet stacking section,
The image forming apparatus temporarily stops discharging the sheet, and at this timing, the designated portion of the sheet bundle is bound by sheet binding means such as a binding staple.

[0003] In this conventional sheet binding method, the sheet binding mechanism is required because the sheet direction and sheet size are various and various, and the sheet binding position and the number of sheets are different depending on the usage of the user. There has also been proposed a sheet binding apparatus that moves in a direction perpendicular to the sheet conveyance direction and can bind a plurality of portions at the rear end of a discharged portion of a discharged sheet.

[0004] Next, the sheet bundle in which a part of the sheet is bound is rotated by a discharge roller disposed inside the apparatus and retracted from the sheet, and the sheet bundle is sandwiched by the opposing discharge rollers. By nipping and conveying the sheet bundle, the sheet bundle is discharged onto a sheet stacking tray provided on a side surface of the apparatus. By repeating this operation, a predetermined number of sheet bundles are sequentially stacked on the sheet stacking tray. Since the sheet stacking tray also serves as a temporary stock stacking tray when sheets are bundled, it is configured to be able to move up and down, and moves downward for sheet stacking according to the thickness of the discharged sheet. It has become.

[0005] In recent years, there is an apparatus for conveying and aligning a sheet slightly different from the above-described conventional example.

This is a device for binding sheets in the sheet conveying direction, temporarily aligning the sheets in the sheet conveying direction, and after a predetermined sheet is stacked on the stacking section.
The sheet bundle is conveyed for each bundle in the same direction as the sheet conveyance direction, conveyed to a predetermined position, and temporarily stopped. afterwards,
After binding and binding one position of the sheet bundle, the sheet bundle is further conveyed in the same direction as the sheet conveyance direction, stopped at a predetermined distance, and stopped at the second position. Then, the bound sheet bundle is discharged to a stacking tray.

[0007]

However, in the above-mentioned conventional example, the following improvements are desired.

(1) When aligning sheets in the width direction,
Even if the alignment plate is operated a predetermined number of times to perform alignment, the integrity of the sheet immediately before the binding operation may be inferior to the integrity of other sheets.

(2) Regarding the alignment belt for aligning and holding the sheet in the sheet conveying direction, in the conventional example, the sheet is aligned in a direction crossing the conveying direction, so that the alignment belt is shifted in the width adjusting direction. There were things. As a result, when the alignment belt tries to return to the original position,
At the same time, the top sheet is also taken and shifted in the direction opposite to the alignment direction, so that the width alignment performance may be reduced.

(3) After the sheets are aligned in the sheet conveyance direction, while the next sheet is stacked and aligned, the sheets are urged with a slight force in the conveyance direction by the alignment belt, but the conveyance belt slips. Therefore, it is difficult to reliably hold the sheet so as not to return in the direction opposite to the transport direction, and there is a possibility that the consistency of the leading end of the sheet may be reduced.

(4) When the sheet bundle is conveyed to a predetermined position after the sheets are aligned, if the sheet bundle is nipped and conveyed by the conveying roller, the sheet bundle may be shifted in the conveying direction. Was.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet processing apparatus capable of properly aligning a sheet conveyed and stacked on a sheet stacking unit in a width direction and an image forming apparatus having the same. .

[0013]

The invention according to claim 1 is
Conveying means for conveying the sheet, sheet stacking means for stacking the sheet conveyed by the conveying means, width aligning means for adjusting the direction intersecting the conveying direction of the sheet stacked on the sheet stacking means, and the width A binding unit that performs binding processing on the sheet bundle aligned by the alignment unit; and, when a predetermined number of sheets are stacked on the sheet stacking unit, the sheet alignment by the width alignment unit performed for each sheet stacked on the sheet stacking unit. Control means for controlling the number of alignments (A) and the number of sheet alignments performed on the final sheet (B) so that (A) <(B) is satisfied.

According to a second aspect of the present invention, the matching means includes:
It is characterized by two reciprocations during alignment of each sheet and four reciprocations during alignment of the final sheet.

According to a third aspect of the present invention, an abutting reference member for regulating a leading end of a sheet conveyed to the sheet stacking means, and a sheet conveyed to the sheet stacking means abutting against the abutting reference member. A plurality of transport belts for transporting in the direction, and for preventing return of the sheet, and for preventing the transport belt from shifting in a direction intersecting the rotation direction of the transport belt, provided for each of the transport belts. And a belt regulating member.

The invention according to a fourth aspect is characterized in that a brush is provided which abuts on the sheet conveyed by the sheet stacking means and is oriented so as to prevent the conveyed sheet from returning.

According to a fifth aspect of the present invention, the brush is a static elimination brush for removing static electricity from a sheet.

According to a sixth aspect of the present invention, the control means includes:
A sheet conveying speed for conveying a sheet to the sheet stacking unit and a bundle conveying speed for conveying a sheet bundle stacked on the sheet stacking unit are controlled such that a sheet conveying speed> a bundle conveying speed. .

[Operation] Based on the above construction, the sheet is conveyed to the sheet stacking means by the conveying means, and the widthwise alignment of the sheets by the width aligning means is performed by binding the sheet bundle more than the number of times of alignment for each stacked sheet. The number of alignments at the time of binding processing by the means, that is, the number of alignments at the time when the final sheet is stacked, is controlled to be increased. Thereby, the consistency of the sheet bundle bound by the binding unit is improved.

In addition, a belt regulating member is provided for each of the transport belts to prevent the transport belt for transporting the stacked sheets against the abutment reference member from shifting in a direction intersecting the rotation direction. In addition, when the sheets are aligned in the width direction, the sheet is prevented from being returned by the conveyance belt.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 8 shows an example of an image forming apparatus main body (copier main body) provided with a sheet processing apparatus according to the present invention.

The image forming apparatus main body (copier main body) 900 includes a platen glass 906 as a document placing table, a light source 9
07, a lens system 908, a paper feeding unit 909, an image forming unit 90
2, an automatic document feeder 940 for feeding a document to the platen glass 906, a sheet processing apparatus A for stacking and binding and binding an image-formed sheet discharged from the copying machine main body, and the like.

A paper supply unit 909 stores cassettes S for recording and is detachable from cassettes 910 and 91 of the apparatus main body 900.
1 and the deck 913 arranged on the pedestal 912
have. An image forming unit (image forming unit) 902 includes a cylindrical photosensitive drum 914 and a developing device 91 around the photosensitive drum 914.
5, a transfer charger 916, a separation charger 917, a cleaner 918, a primary charger 919, and the like. On the downstream side of the image forming unit 902, a transport device 920,
A fixing device 904, a discharge roller pair 905, and the like are provided.

The operation of the image forming apparatus main body will be described.

When a sheet feed signal is output from a control device provided on the apparatus main body 900 side, cassettes 910 and 91 are output.
The sheet S is fed from the first or deck 913. On the other hand, the original D placed on the platen glass 906
Light reflected from the light source 907 is reflected by the lens system 90.
The light is irradiated to the photosensitive drum 914 via the reference numeral 8. The photosensitive drum 914 is charged in advance by a primary charger 919, and an electrostatic latent image is formed by irradiation with light, and then the electrostatic latent image is developed by a developing unit 915 to form a toner image. .

The sheet S fed from the sheet feeding unit 909 is
The skew is corrected by the registration rollers 901, and the skew is sent to the image forming unit 902 at the same timing. In the image forming unit 902, the toner image on the photosensitive drum 914 is transferred to the fed sheet S by the transfer charger 916, and the sheet S on which the toner image has been transferred is transferred to the separation charger 91.
7, is charged to a polarity opposite to that of the transfer charger 916,
It is separated from the photosensitive drum 914.

Then, the separated sheet S is conveyed to the fixing device 904 by the conveying device 920, and
04, the transfer image is permanently fixed on the sheet S. The sheet S on which the image is fixed is discharged out of the apparatus by a discharge roller pair 905, or the sheet processing apparatus A is discharged from the apparatus main body 900 by a main body discharge roller (main body discharge means) 921.
Is conveyed (discharged) to the entrance 1 of the printer.

Next, a sheet processing apparatus according to the present invention will be described. FIG. 1 is a vertical sectional side view of a sheet processing apparatus A that best illustrates the configuration of the present invention.

In FIG. 3, an image-formed sheet P discharged from the main body of the image forming apparatus 900 indicated by a virtual line.
Is transported to a sheet binding apparatus (sheet processing apparatus) A connected below the image forming apparatus main body 900. Reference numeral 2 denotes an entrance conveying roller pair arranged at the entrance of the sheet. Reference numeral 3 denotes an entrance sensor for detecting that the sheet P has entered the sheet binding apparatus A as a sheet processing apparatus. A guide plate 5 for guiding the sheet P), a reference numeral 5 denotes a pair of conveying rollers (conveying means) for conveying and stacking the sheet P on a sheet binding portion in the next process, and a reference numeral 6 denotes a sheet position detecting lever arranged near the pair of conveying rollers 5 It is.

Reference numeral 7 denotes an upper sheet guide plate when the sheet is conveyed by the conveying roller pair 5. The upper end of the sheet P is guided by the upper sheet guide plate 7 to the stacking portion. Reference numeral 8 denotes an alignment tray (sheet stacking unit) that temporarily stacks the sheets P discharged by the transport roller 5 and aligns the sheets.

Reference numeral 9 denotes a sheet rear end pressing rib (push-out member) 9 for pressing the rear end of the sheet on the alignment tray 8, and has an inclined surface so that the sheet P is pushed out (biased) in the conveying direction. 9a (FIG. 5). Reference numeral 10 denotes a plurality of transport belts for transporting the sheet P transported by the transport rollers 5 further downstream in the transport direction. The transport belt 10 is configured to be deformed as the number of stacked sheets increases. The conveying belt 10 conveys the sheet because the leading end of the sheet abuts against the leading end stopper (abutting reference member) 11. However, even after the leading end of the sheet strikes the leading end stopper 11, the conveying belt 10 is in contact with the uppermost sheet. The sheet is always urged in the direction of conveying the uppermost sheet in the conveying direction. However, since the sheet P does not have a conveying force enough to get over the sheet leading end stopper 11, the uppermost sheet always slips with the conveying belt 10 normally.

Reference numeral 12 denotes a conveyance guide for receiving the sheet P from the guide 7 and guiding the sheet to the next step. Reference numeral 13 denotes a charge removal brush attached to the transfer guide portion for removing charges on the sheet. In order to prevent the sheet P from returning in the direction opposite to the transport direction of the sheet P, it is always in contact with the uppermost sheet, and is arranged at an angle with respect to the sheet return direction so as to be a counter. .

Reference numeral 14 denotes a sheet bundle conveying upper roller which is located at a position substantially coincident with the nip portion of the conveying belt 10 and the sheet, and is disposed at a position shifted in the width direction of the alignment tray 8. It is pivotally supported by a horizontal arm, and can be moved up and down by the action of a bundle transport roller solenoid 43 (FIG. 7). 16 is the upper roller 1 for conveying the sheet bundle.
A lower roller for conveying a sheet bundle, which is disposed to face the sheet bundle 4 and is driven at a predetermined timing by a bundle conveying motor 55 (FIG. 7) to convey the sheet bundle.

Reference numeral 17 denotes a stack detection lever for detecting that sheets are stacked on the alignment tray 8, and reference numeral 18 denotes a curl pressing lever (abutting reference member) 18 for pressing the curl at the leading end of the sheet. A plurality of alignment trays 8 are arranged in the width direction. Reference numeral 19 denotes an upper discharge roller for discharging the sheet bundle out of the apparatus. The upper discharge roller 19 is rotated by rotation of a lever 20 which supports the upper discharge roller.
Can be driven up and down. 21 is a lower sheet discharge roller provided opposite the upper sheet discharge roller 20, 22 is a pair of discharge rollers 20, a discharge sensor provided in the vicinity of 21, and 23 is a sheet discharge tray for stacking discharged sheets. Reference numerals 24 indicate a full load detection lever for detecting the stacking amount of the sheets P discharged onto the discharge stacking tray 23.

Reference numeral 25 denotes a conveyor belt holder that regulates both sides of the conveyor belt 10 with a predetermined distance, 26 denotes an alignment plate (width alignment means) for moving and aligning the sheet in a direction intersecting the sheet conveyance direction, and 27 ( FIG. 4) shows conical rotatable rollers (pressing rollers) provided on the alignment plate 26, and 28.
Is a side plate (width adjusting means) of the apparatus provided opposite to the alignment plate 26, 29 is a conical rotatable roller (pressing roller) provided on the facing surface of the side plate 28, and 30 and 31 are side plates. 28 is a reference surface for abutting the sheet provided at 28. Reference numeral 32 indicated by a virtual line is a stapling device (binding means) for binding the sheet bundle by a known technique so that a predetermined position of the sheet bundle can be bound in a direction parallel to the sheet conveying direction. Are located in

In FIG. 2, a frame (belt regulating member) 47 of the conveyor belt holder 25 is pivotally supported by a support shaft 45, and a roller 46 (supporting and driving the transfer belt 10) is supported by the support shaft 45. FIG. 3) is provided.

When the sheet P is aligned by the alignment plate 26,
When the transport belt 10 is displaced in the same direction due to the movement of the sheet P in the width direction, the aligned sheet P may be shifted in the width direction by the transport belt 10 when the alignment plate 26 separates from the sheet bundle. According to the embodiment, since both sides of the transport belt 10 are regulated by the frame 47,
There is no return displacement of the sheet P in the width direction, and the alignment of the sheet bundle is improved.

In the above configuration, the image forming apparatus main body 90
The sheet P discharged from 0 enters the entrance conveyance roller 2 at its leading end, and is conveyed to the next process. At this time, the sheet P is stored in the sheet binding device A by the entrance sensor 3.
Is detected that has entered. The sheet P is conveyed in the direction of the sheet stacking unit 8 by the conveying roller pair 5 while being guided by the guide plate 4, and is discharged. The sheet position detection lever 6 can detect that the sheet P has been completely discharged by the conveying roller pair 5.

At the same time as the sheet P is conveyed by the conveying roller pair 5, the leading end of the sheet enters the conveying belt 10 and is conveyed downstream in the conveying direction. Then, when the leading edge of the sheet abuts against the leading edge stopper 11, the transport belt 11 and the sheet slip because the transport force of the transport belt 11 is small. Thereby, the sheet P is
It stands by on the alignment tray 8 while always receiving a light conveying force in the conveying direction.

Referring to FIG. 4, the alignment of the sheet P in the width direction will be described.

As described above, after the sheets P aligned in the sheet conveyance direction are on standby on the alignment tray 8, the alignment plate 26 pushes the sheets P on the side plate 28 of the apparatus. The dashed line position 2 is on the reference plane 30/31 side.
6A, and moves the sheet to a predetermined position.
Thereafter, the alignment plate 26 returns to the position indicated by the two-dot chain line 26A in preparation for the next sheet. The movement of the alignment plate 26 is performed by a drive motor 49 (FIG. 4) included in the alignment plate drive mechanism 50.

At this time, the sheet P may have a curl in a direction (width direction) crossing the conveying direction. A sheet P having a curl such as the sheet P shown in FIG.
, The side edge of the sheet P tends to be lifted in the curl direction (upward) by the sheet curl.

However, since the side edges of the sheet P are prevented from being lifted above the predetermined height by the rollers 27 and 29, even if the sheet P is curled in the width direction, The consistency in the width direction of the sheet P can be maintained.

Since the tips of the rollers 27 and 29 have a conical shape, even if the sheet P is curled,
The end can be easily guided to a predetermined height. Further, since the rollers 227 and 29 are configured to be rotatable in the sheet P conveyance direction, there is no resistance in the sheet P conveyance direction.

The movement of the alignment plate 26 with respect to the alignment of the sheet P in the sheet width direction will be further described. The width of the sheet P varies, and the sheet P is curled. The sheet aligning position of the aligning plate 26 presses the sheet end to a position narrower than the sheet width of the sheet size to be conveyed. Further, even when the stacking amount of the thick paper or the sheet is increased, the alignment plate 26 is moved to a position smaller than the sheet width, so that a large load may be applied to the drive motor 49 of the alignment plate 26. In order to prevent this, a spring (not shown) is arranged between the matching plate 26 and the driving mechanism 50, and when the matching plate 26 receives a load equal to or more than a predetermined value,
It escapes in the direction opposite to the pressing direction. By repeating the above operation, a predetermined number of sheets P are sequentially stacked on the alignment tray 8.

Next, the consistency of the sheet tip with respect to the sheet P having a curl at the sheet tip will be described with reference to FIG.

The curled sheet P is conveyed by the conveying belt 10 at the leading end, and the leading end of the sheet P is pressed from above by the curl pressing lever 18. The curl press lever 18 whose base is pivotally supported by the support shaft 41 is driven by a curl press lever solenoid 46 (FIG. 7). A plurality of the curl pressing levers 18 are arranged in the width direction of the sheet P, and press the leading edge curl of the sheet to ensure the leading edge alignment.

Next, the state of the trailing edge of the sheet when the sheet is stacked on the alignment tray 8 will be described with reference to FIG.

In the figure, the sheet P is discharged onto the alignment tray 8 by the pair of conveying rollers 5, and at this time, the rear end of the sheet leans on the inclined surface 9 a of the rear end holding rib 9. . That is, the sheet rear end pressing rib 9 guides the rear end of the sheet P so as to be pushed out in the transport direction. In addition, the sheet leading end abuts on the sheet leading end stopper 11 at the same time. By doing so, it is possible to prevent the sheet P from returning in the direction opposite to the transport direction, and to prevent the sheet P from shifting.

By the steps described above, the sheet P is
Although a predetermined number of sheets are aligned and stacked on the alignment tray 8, the alignment operation for the sheet bundle after the last sheet of the sheet P is stacked is changed from the alignment operation for each time another sheet is stacked.

In the above-described embodiment, the alignment operation is performed twice for each sheet other than the last sheet. That is, when the sheet P is aligned in the width direction (sheet width direction), after the alignment plate 26 is moved to a predetermined position,
The alignment plate 26 is returned to the opening direction once, and thereafter, the alignment plate 26 is again moved to a predetermined position, and then returned to the opening direction. Thereby, the alignment performance of the sheet P can be more reliably improved than a single alignment operation of the alignment plate 26.

On the other hand, the sheet bundle after the last sheet is stacked is subjected to the alignment operation four times by the alignment plate 26. The sheet bundle on the alignment tray 8 is stapled by the stapling device 32.
This is an alignment operation necessary for securely aligning the sheet bundle in the width direction before binding. In this manner, each time the sheets P are stacked on the alignment tray 8, the alignment plate 26 is
(A) and the alignment plate 26 when the final sheet before the sheet bundle is bound by the stapling device 32 is stacked.
Is controlled by the control device (control means) 60 so that (A) <(B).

With the above-described series of operations, the sheet bundle stacked on the alignment tray 8 starts the following operation at a predetermined timing.

The upper bundle transport roller 14 shown in FIG. 6 is in a state of being dropped by the bundle transport roller solenoid 43 (FIG. 7), and nips the sheet P in cooperation with the lower bundle transport roller 16. Next, the sheet leading end stopper 11 is rotated in the direction of the arrow around the support shaft 11a by the stopper solenoid 52 (FIG. 7) to open the sheet leading end. Thereafter, the bundle conveying upper and lower rollers 14 and 16 start rotating at a predetermined timing, and convey the sheet bundle P to the sheet discharge port side.

The transport speed V ₂ during the bundle transport of the sheets is
Than the conveyance speed V ₁ of the time for conveying the sheet P onto the alignment tray 8, so as to slow the transport speed, the bundle conveying motor 55 (FIG. 7) control to decrease the rotational speed apparatus 6
It is controlled by 0.

This is performed to prevent the sheet bundle from shifting in the transport direction when the sheet bundle is transported. When the leading end of the sheet bundle reaches a predetermined position, the discharge roller upper 19 moves downward by the operation of a solenoid (not shown), and the discharge roller lower 2 moves.
The nip is performed through the sheet bundle P in cooperation with the sheet bundle P.

The bundle discharge speed of the pair of discharge rollers 19 and 21 due to the rotation of the bundle discharge motor 56 (FIG. 7) is equal to the bundle transfer speed of the pair of bundle transfer rollers 14 and 16; There is a speed relationship. Therefore, the sheet bundle is conveyed to a predetermined position without being slackened and without shifting. When the bundle is conveyed to a predetermined position, the conveyance of the sheet bundle is temporarily stopped.

Therefore, the stapler driving device 57 (FIG. 7)
The stapling device 32 drives the sheet bundle to bind the first place. Thereafter, the sheet bundle is further transported by bundle transport roller pairs 14, 15 and bundle discharge roller pair 19,
After the bundle is conveyed by 21 and conveyed to the second staple position, the staple device 32 performs the second staple. Thereafter, the sheet bundle is further conveyed, the trailing end of the sheet bundle is kicked out by the lower discharge roller 21, and is discharged onto the discharge stacking tray 23. By repeating the above operations, the sheet bundle is sequentially discharged and stacked on the discharge stacking tray 23.

[0059]

As described above, according to the present invention,
When the width direction of the sheet bundle stacked on the sheet stacking unit is aligned by the width aligning unit, the number of alignments of the width aligning unit for each sheet to be stacked (A) and the number of alignments performed when the final sheet is stacked (B ) Is controlled so that (A) <(B), it is possible to improve the consistency of the sheet bundle and the consistency at the time of the binding process by the binding unit.

Further, the transport belt for transporting the sheets stacked on the sheet stacking means toward the abutting member is regulated by the belt regulating member, and the belt regulating member is provided for each of the plurality of transport belts. The occurrence of misalignment of the aligned sheets due to the belt returning in the width direction can be eliminated, and the alignment of the sheet bundle can be improved.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a sheet processing apparatus according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a conveyor belt holder.

FIG. 3 is a side view showing an alignment portion at the front end of the sheet.

FIG. 4 is a perspective view showing an alignment unit in the sheet width direction.

FIG. 5 is a side view of an extruding member for extruding a rear end of the sheet.

FIG. 6 is a side view of the leading end alignment unit showing a state of discharging the sheet bundle.

FIG. 7 is a block diagram according to control of the present invention.

FIG. 8 is a vertical sectional front view showing an example of an image forming apparatus main body including the sheet processing apparatus according to the present invention.

[Explanation of symbols]

P Sheet, Sheet Bundle 5 Conveyance Roller Pair (Conveyance Means) 8 Alignment Tray (Sheet Loading Means) 11 Sheet End Stopper (Abutment Reference Member) 26 Alignment Plates 27, 29 Conical Roller (Pressing Roller) 28 As Alignment Plate Side plates 26, 28 Width alignment means 32 Stapler device (binding means) 900 Image forming apparatus main body 902 Image forming means 921 Main body discharge roller (Main body discharge means)

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masayoshi Fukatsu 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Yasuyoshi Hayakawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Within Non Co., Ltd. (72) Inventor Atsushi Ogata 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Tomoyuki Araki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. F term (reference) 3F054 AA01 AB01 AC01 BA02 BH08 BH14 CA01 CA31 DA01

Claims (7)

[Claims] 1. A conveying device for conveying a sheet, a sheet stacking device for stacking a sheet conveyed by the conveying device, and a width alignment for aligning a direction intersecting a conveying direction of the sheet stacked on the sheet stacking device. Means for binding a sheet bundle aligned by the width aligning means; and a step of stacking a predetermined number of sheets on the sheet stacking means.
The number of sheet alignments (A) by the width alignment unit performed for each sheet loaded on the sheet stacking unit and the number of sheet alignments (B) performed on the last sheet are: (A) <(B) And a control means for controlling the sheet processing apparatus so as to establish a relationship. 2. The sheet processing apparatus according to claim 1, wherein the aligning unit makes two reciprocations when aligning each sheet, and makes four reciprocations when aligning the last sheet. 3. An abutting reference member for regulating a leading end of a sheet conveyed by the sheet stacking means, a sheet conveyed by the sheet stacking means being conveyed in a direction to abut the abutting reference member, and A plurality of conveyor belts for preventing return of the sheet, and for preventing the conveyor belt from shifting in a direction intersecting the rotation direction of the conveyor belt, a belt regulating member provided for each conveyor belt, The sheet processing apparatus according to claim 1, further comprising: 4. The sheet processing apparatus according to claim 1, further comprising a brush that abuts on the sheet conveyed by the sheet stacking unit and prevents the conveyed sheet from returning. 5. The sheet processing apparatus according to claim 4, wherein said brush is a static elimination brush for removing static electricity of a sheet. 6. The sheet feeding speed for conveying a sheet to the sheet stacking unit and the bundle conveying speed for conveying a sheet bundle stacked on the sheet stacking unit, wherein the sheet conveying speed is greater than the sheet conveying speed. The sheet processing apparatus according to claim 1, wherein the sheet processing speed is controlled. 7. A sheet processing apparatus according to claim 1, wherein an image forming unit forms an image on a sheet.
An image forming apparatus comprising: a main body discharging unit configured to discharge a sheet on which an image is formed by the image forming unit to the sheet processing apparatus.