JP2003312920A - Sheet treatment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent sheets from adhering to each other on a stack tray by cooling a high temperature sheet transferred from a high speed machine on a treatment tray of a sheet treatment device. <P>SOLUTION: An endless metallic heat releasing belt 190 is installed in the sheet treatment device, and brought into contact with a sheet bottom face during carrying and a sheet top face loaded on the treatment tray. The heat releasing belt 190 is cooled by a cooling fan 100, so as to rapidly cool the sheet loaded on the treatment tray. Therefore, adhesion of the sheets on the stack tray is prevented, on which a large amount of sheets are loaded, so as to always provide a high quality image. <P>COPYRIGHT: (C)2004,JPO

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, and more particularly, to a stacking process and binding of sheets which are discharged by forming an image on a sheet surface by an image forming apparatus such as a copying machine or an LBP. At the time of processing, particularly sheet stacking processing, the sheet stacking means also serves as sheet stacking processing.
The present invention relates to a sheet processing apparatus improved so as to effectively cool a stacked sheet bundle and an image forming apparatus including the sheet processing apparatus.

[0002]

2. Description of the Related Art Generally, as an image forming apparatus having a sheet processing apparatus, first processing means for aligning and focusing image-formed sheets and, if necessary, binding a part of the sheet bundle by staple binding ( An apparatus in which a "processing tray") and a second processing unit (hereinafter referred to as "stack tray") that receives and stores the aligned sheet bundle or the stapled sheet bundle for each bundle Has already been proposed.

FIG. 8 shows a schematic structure of a conventional sheet processing apparatus of this type.

In FIG. 8, a conventional sheet processing apparatus has a pair of carry-out rollers 701 including a lower carry-out roller 701a for carrying out a sheet P from a sort path and a carry-out roller 701b, and a processing tray unit 800 for receiving the carried-out sheet P. And a stack tray 900 for stacking a sheet bundle discharged after processing.

Lower discharge roller 70 of discharge roller pair 701
In 1a, several points in the axial direction between the carry-out roller 701b and
The knurled belt 702 is wound around the knurled belt 702, and the sheet guides 7 are provided at appropriate positions between the knurled belts 702.
03 is arranged.

The processing tray unit 800 is a processing tray that is inclined by locating the downstream side (upper left side in the figure) upward and the upstream side (lower right side in the figure) downward with respect to the sheet P discharge direction. 801 and the rear end stopper 8 of the upstream end
02, a pair of left and right aligning members 803 in the sheet width direction, a pair of lower and upper bundle discharge rollers 804a and 804b arranged on the downstream side of the processing tray 801, and a tip. Upper bundle discharge roller 80
4b, a swing guide 805 that supports the upper bundle discharge roller 804b so that the upper bundle discharge roller 804b can come into contact with and separate from the lower bundle discharge roller 804a, and a retractable paddle 806 disposed above the intermediate portion.

In this case, the lower and upper bundle discharge rollers 804a and 804b of the bundle discharge roller pair 804 are controlled by the swing guide 805 so that the lower bundle discharge rollers 804 can be controlled.
The sheet P from the carry-out roller pair 701 is received on the processing tray 801 in an open state in which the upper bundle discharge roller 804b is separated from the sheet a.

The sheet P continues to be pulled back by the rotational drive of the pull-in paddle 806 and is aligned by the operation of each aligning member 803, and the sheet end portion of the sheet P is rotated by the counterclockwise rotation of the knurled belt 702. The feeding action is also added, and the sheet P is abutted against the trailing edge stopper portion 802 through each sheet guide 703, and the alignment operation is completed in this manner.

Subsequently, the sheet bundle aligned on the processing tray 801 is bound at the aligning position, and then the lower bundle discharge roller 804a and the upper bundle discharge roller 80.
4b, and this time the lower bundle discharge roller 704
By rotating a in a counterclockwise direction, the processed sheet bundle is discharged onto the stack tray 900.

[0010]

At present, some copiers or printers have a productivity of 100 sheets or more per minute. In these high-speed machines, so-called sheet ejection adhesion in which sheets to be ejected stick to each other on the sheet ejection tray or the stack tray of the sheet post-processing apparatus is a big problem. However, in the above-described conventional configuration, there is no means for cooling the sheets in the sheet processing apparatus, and when a large number of sheets discharged from the high speed machine are stacked on the stack tray 900, the sheets are stacked on the stack tray 900. There is a problem of sticking with.

It is an object of the present invention to provide an endless belt-shaped member made of a metal material and a sheet processing apparatus for preventing sticking of sheets stacked on the stacking unit by means of cooling the endless member. is there.

[0012]

According to the present invention, there is provided a discharging means for discharging a sheet, a stacking means having a stopper portion capable of stacking the sheet discharged by the discharging means and supporting an end portion of the sheet, A metal thin film and endless belt-shaped cooling member that is driven by the discharging means and is rotatable, cools the sheet by lightly contacting the upper surface of the sheet discharged onto the stacking means, and pulls the sheet toward the stopper portion side. When,
An endless member for constantly contacting the aligning means for moving and aligning the sheet on the stacking means in the direction intersecting the sheet conveying direction and the endless belt-shaped feed member on the upper surface of the sheet on the stacking means. Towing means for towing and moving,
Cooling means for cooling the endless member.

[Operation] Based on the above configuration, the sheet discharged to the stacking means by the discharging means is cooled by the endless belt cooling member, and at the same time, the uppermost sheet stacked on the stacking means is always cooled. Therefore, the sheets are rapidly cooled, sticking between the sheets is prevented, and high-quality images are always provided even when the sheet processing apparatus is connected to a high-speed machine.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A sheet processing apparatus according to the present invention and an image forming apparatus including the same will be described in detail below.

First, regarding an image forming apparatus according to the present invention, here, an image forming apparatus equipped with a sheet processing apparatus,
This will be described with reference to FIG.

The ADF 2, which is a document transporting device (sheet material transporting device), has a document tray 4 on the upper side thereof, and a wide belt wound around a drive roller 36 and the other turn roller 37 is disposed below the document tray 4. ing. The originals (sheet materials) P on the original tray 4 are sequentially separated and fed from the uppermost paper by a separating means, and are conveyed to a platen glass (platen) 3 which is a reading position (image reading unit) of the copying machine main body. .

The wide belt is in contact with the platen 3 rotatably in the forward and reverse directions, and the sheet material document P conveyed from the document tray 4 is placed at a predetermined position on the platen 3 or the platen 3 is moved. The upper sheet material document P is carried out onto the paper discharge tray 10. It should be noted that the manuscript P includes one page (2
The pages are placed on the document tray 4 in the order of page, page 3 (page 4).

Copying machine main body 1'as an image forming apparatus main body
Is composed of an image input unit 200 '(hereinafter referred to as a reader unit) and an image output unit 300 (hereinafter referred to as a printer unit).

The reader unit 200 'optically reads the image information recorded on the document P, photoelectrically converts it, and inputs it as image data. The platen 3 and the lamp 20 are used.
2. A scanner unit 204 having a mirror 203
And mirrors 205 and 206, a lens 207, an image sensor 208, and the like. The printer unit 300 is an image forming unit using well-known electrostatic latent image formation.

Next, the printer unit 300 which is an image output unit
Explain.

Reference numeral 800 denotes an upper cassette, and the sheet material in the cassette is separated and fed one by one by the action of the separating claw and the feeding roller 801, and is guided to the registration roller 806.
Reference numeral 802 denotes a lower cassette, and the sheet material in the cassette is separated and fed one by one by the action of the separating claw and the feeding roller 803, and is guided to the registration roller 806. Reference numeral 804 denotes a manual feed guide, which guides the sheet material one by one to a registration roller 806 via a roller 805. A sheet material stacking device (deck type) 808 includes an intermediate plate 808a that moves up and down by a motor or the like, and the sheet material on the intermediate plate is separated and fed one by one by the action of a feeding roller 809 and a separating claw and conveyed. It is guided to the roller 810.

Reference numeral 812 is a photosensitive drum, 813 is a reading optical system, 814 is a developing device, 815 is a transfer charging device, and 816 is a separating charging device, which constitute an image forming unit.

Reference numeral 817 is a conveyor belt for conveying the image-formed sheet material, 818 is a fixing device, 819 is a conveyance roller, and 820 is a flapper. The sheet material on which the image is formed is guided to the main body discharge roller (main body discharge means) 821 by the flapper 820, and is discharged to the sheet processing apparatus on the downstream side.

An image is formed on the photosensitive drum according to the set number of copies for one original placed on the platen, and a sheet material for the number of copies is provided in the cassette 80.
Each time an image is formed on the photosensitive drum, the image is fed from any of 0, 802, and the deck 808. The registration between the image on the photosensitive drum and the sheet material is performed by the registration roller 806.

When the required number of copies are formed, the original is ejected from the platen, and the next original is positioned on the platen. The same applies hereinafter.

Reference numeral 900 denotes an intermediate tray, which is used to form an image on both sides of a sheet material, or to form an image on one side of a sheet material (multiplexing). To stock. 901 is a conveyance roller, 9
Reference numeral 02 is a conveyor belt, 903 is a flapper, 904 is a conveyor belt, and 905 is a conveyor roller. In the case of double-sided copying, the sheet material is guided to the intermediate tray 900 through the path 906.

The image surface of the sheet material faces upward. In the case of multiple copy, the sheet material is guided to the intermediate tray 900 through the path 907. The image surface of the sheet material faces downward.

The sheet material stacked on the intermediate tray 900 includes auxiliary rollers 909 and 910 and a pair of forward / reverse separation rollers 9.
By the action of 11, the sheets are separated one by one from below and are re-fed. The re-fed sheet material is fed by the transport rollers 913, 9
14, 815, roller 810, registration roller 806
Is guided to the image forming unit via. After the image is formed, it is discharged in the same manner as described above.

According to the number of copies set for one original placed on the platen, first one-sided copies are made, and these are stacked on the intermediate tray 900. After that, the front and back of the original on the platen are reversed, and the original is guided to the platen again, and this image is read by the number of copies. The read image is formed on the sheet material that is re-fed from the intermediate tray 900 each time the image is read. On the other hand, there is also a method of making only one copy each time the document is circulated by the automatic document feeder. According to this method, even when a plurality of copies are created, a copy group in which the page order is uniform is sequentially obtained, so that the required number of copies can be obtained separately without the sorter. When making double-sided copy with this method, 1
Continuously scan both sides of one original, copy on both sides of the sheet material, eject it, and then repeat the same for both sides of the next original. A flock is obtained.

The image-formed sheet discharged from the main body of the copying machine is discharged to a sheet processing apparatus (also called a finisher) 1 by a main body discharge roller (main body discharge means) 302.

The sheet carried in from the copying machine body 1'is
Through the buffer roller 5, the flapper 10, and the path 22, the discharge roller 7 serves as an intermediate tray for the processing tray 130.
Temporarily loaded on top. The sheet bundle on the processing tray 130 is aligned on both sides in a direction intersecting the sheet conveyance direction by an aligning member (not shown), and the rear end of the sheet is bound by the stapler 100 (101) as necessary. After that, the sheet is discharged onto the stack tray 200 which moves up and down by the bundle discharge roller pair 180.

Next, the sheet processing apparatus according to the present invention will be described.

<General Description of Sheet Processing Apparatus> First, the main components of the sheet processing apparatus will be described.

FIG. 1 is an overall sectional view schematically showing a schematic structure of a sheet processing apparatus according to this embodiment.

In the structure of the sheet processing apparatus (hereinafter referred to as "finisher") 1 shown in this figure, reference numeral 2 denotes an inlet roller pair for receiving the sheet P discharged from the main body discharge roller pair 302 of the image forming apparatus 300, 3 is
A first pair of conveying rollers that conveys the received sheet P, and 31 is a sheet detection sensor (counting unit) on the entrance side that detects passage of the sheet P. Further, reference numeral 50 is a punch unit for making a hole near the rear end of the conveyed sheet. Reference numeral 5 denotes a roller having a relatively large diameter (hereinafter referred to as “buffer roller”) which is arranged on the way of conveyance,
The sheet P is pressed against the roll surface by the pressing rollers 12, 13 and 14 arranged around the outside to be conveyed.

A flapper 10 switches between the path 22 and the buffer path 23 for temporarily storing the sheet P. 32 is a sheet P in the buffer path 23
Is a sensor that detects

Reference numeral 6 denotes a second conveying roller pair of the path 22, and reference numeral 129 temporarily stacks the sheets P, aligns the stacked sheets P, and staples the staple unit 10.
A processing tray (stacking means) 1 provided for performing staple processing by a stapler 101 of 0 (binding means) 1
It is a processing tray unit including 30. Processing tray 13
On the discharge end side of 0, one discharge roller forming a bundle discharge roller pair (bundle transfer means), here, a lower discharge roller 180a as a fixed side is arranged. 7 is path 22
And a pair of first discharge rollers for discharging the sheets P onto the processing tray 130 serving as a first stacking tray.

180b is supported by the swing guide 150, and when the swing guide 150 reaches the closed position,
The upper discharge roller is pressed against the lower discharge roller 180a to discharge the sheets P on the processing tray 130 onto the stack tray (second stacking tray) 200 in a bundle. Reference numeral 40 denotes a bundle stacking guide that supports a rear end (rear end in the bundle discharge direction) edge of the sheet stack stacked on the stack tray 200, and also serves as an exterior of the sheet processing apparatus 1 here.

<Outline of Processing Tray Unit> Next,
Processing tray unit 129 including the processing tray 130
Will be described in detail with reference to FIGS. 2, 3 and 4.

The processing tray unit 129 includes the processing tray 130, the rear end stopper 131, the aligning means 140, the swing guide 150, the drawing paddle 160, and the bundle discharging roller pair 1.
80, and a heat radiation belt (endless belt-shaped metal member) 190 which is rotationally driven by a first discharge roller pair 7 (discharge means) including a discharge roller 7a and a discharge roller 7b.

In this case, with respect to the processing tray 130, the downstream side (upper left side in the figure) is located above and the upstream side (lower right side in the figure) is located below with respect to the discharge direction of the sheet bundle. The sheet guides 130c, which are set to be inclined, and are arranged at predetermined intervals in the sheet width direction, the heat radiation belts (endless belt-shaped metal members) 190, the cooling means 100, and The trailing end stopper 131 described above is arranged, and in the middle portion, the retractable paddle 1 described later is formed so as to occupy external positions corresponding to the left and right sides of the sheet P.
An alignment means 140 including 60 is arranged. Also,
In the upper part, which is also the downstream side, in detail, in the upper region part of the processing tray unit configuration, a retractable paddle 1 described later is provided.
Swing guide 15 including 60 and bundle discharge roller pair 180
0 is placed.

Here, the heat radiation belt 190 is formed of a thin film metal member having a high slidability on the surface, has flexibility so that it can be deformed in the rotation direction, and the first discharge roller pair 7 is used. Between the lower side, that is, the discharge roller 7a on the side of the processing tray 130 is rotatably wound around and provided with floating rollers 191 and 193 that rotate in contact with the inner peripheral surface of the heat radiation belt 190. At the start of the paddle operation described in (1), the floating rollers 191 and 193 are pulled by the pulling actuator (pulling means) 192 toward the rear side in the figure, and thus to the support surface side of the rear end stopper 131.
The upper sheet guide 130c is abutted and deformed outside the sheet guide 130c so that the abutting of the sheet P on the support surface 131 is not hindered.

The operation of the towing actuator 192 is as follows.
It is controlled by a control device (not shown).

Further, in the state where the heat radiation belt 190 is not pulled as described above, it is in the contact position where it contacts the upper surface of the sheets stacked on the processing tray 130. Heat dissipation belt 1
90 is configured to be in a contact position when the sheet is conveyed.

The sheet P discharged from the first discharge roller pair 7 is rearward due to its own weight, the action of the retractable paddle 160 described later, and the feeding action on the lower surface side of the heat radiation belt 190. Until the abutting support surface 131a of the end stopper 131 is abutted, the processing tray 13
Glide over 0.

Further, as described above, one lower discharge roller 180a constituting the bundle discharge roller pair 180 is arranged at the upper end of the processing tray 130, and the lower surface front end of the swing guide 150 is arranged. The other upper discharge roller 180b, which comes into contact with the lower discharge roller 180a so as to be able to come into contact with and separate from the lower discharge roller 180a, is arranged in the section. Has been done.

<Detailed Description of Matching Means> Next, the matching means 140 will be described.

The pair of aligning members 141 and 142 constituting the aligning means 140 are independently and oppositely arranged on the surface of the processing tray 130. On the upper surface side of the processing tray 130, the matching surfaces 141a and 142a are arranged so as to face each other, are assembled so as to be movable in the thrust (alignment) direction, and are movable by a gear and a motor (not shown). . The sheet P remains at the home position (retracted position) until the sheet P is discharged, and the aligning operation is performed after the sheet P is discharged onto the processing tray 130.

<Detailed Description of Swing Guide> Next, the swing guide 150 will be described.

As described above, the swing guide 150 is at the front end portion of the lower surface corresponding to the downstream side (left side in the drawing), and is in contact with the lower discharge roller 180a of the bundle discharge roller pair 180, and the upper discharge roller 180b. And is pivotally supported by a support shaft 151 at the rear end portion of the lower surface corresponding to the upstream side (right side in the figure), and is swingably supported by a control drive of a drive motor and a rotary cam (not shown). In addition to being swingable, here, the lower discharge roller 180a is connected to the upper discharge roller 180a.
The closed state where b is brought into contact is the home position, and a position sensor (not shown) for detecting this is provided.

In the normal case, when each individual sheet P is discharged onto the processing tray 130, it is in an open state (lower discharge roller 180a vs. upper discharge roller 180b).
Are separated and the swinging guide 150 is swung upward) so that the operations of ejecting and aligning the sheet P and the retracting paddle operation described below can be performed without any hindrance, and the processing tray When the sheet bundle that has been processed on 130 is discharged onto the stack tray 200,
The state shifts to the closed state (the upper discharge roller 180b abuts against the lower discharge roller 180a, and the swing guide 150 swings downward).

<Detailed Description of Pull-In Paddle> Next, the pull-in paddle 160 will be described.

The draw-in paddle 160 is fixed to the drive shaft 161 above the processing tray 130, and is driven to rotate counterclockwise in FIG. 2 at an appropriate timing by a drive motor (not shown). The length of each paddle is set to be slightly longer than the distance to the surface of the processing tray 130, and its home position is an obstacle to the discharge of the sheet P from the first discharge roller pair 7 onto the processing tray 130. It is set in a position where it cannot be.

When the sheet P is discharged onto the processing tray 130 in this state, the drawing paddle 160 is rotationally driven counterclockwise as shown in FIG. 3 to discharge onto the processing tray 130. The sheet P to be formed, and by extension, the trailing edge of the sheet P is the abutting support surface 1 of the trailing end stopper 131.
It is pulled in until it abuts against 31a, and then waits for a predetermined time to stop at the home position position detected by a position sensor (not shown) in good timing.

<Flow of Cooling Sheet P> The inlet roller pair 2, the first conveying roller pair 3, and the buffer roller 5 are rotationally driven respectively, and the sheet P discharged from the image forming apparatus 300 is taken into the apparatus. Then, it is conveyed toward the path 22. Then, the sheet is discharged onto the processing tray 130 by the discharge roller 7a and the roller 7b that form the first discharge roller pair 7.

At the time of this discharge, the heat radiation belt 190 abuts the lower surface of the sheet being conveyed, so that the heat radiation belt takes away the heat of the sheet. The radiating belt is cooled by the cooling fan 100 and the heat is radiated, so that the sheet being conveyed can be cooled.

Sheet P discharged onto the processing tray 130
Is the same as the paddle 160, which has started to return to the rear end stopper 131 side due to its own weight and has stopped at the home position, rotates in the counterclockwise direction and the discharge roller 7a rotates in the discharge direction (counterclockwise direction). The pulling force of the heat radiation belt 190 rotating in the direction is applied to promote the returning action.
When the trailing edge of the sheet P abuts against the trailing edge stopper 131 and stops, the rotation of the paddle 160 is stopped, but the discharge roller 7a continues to rotate until the end of the job. Therefore, as shown in FIG. During that time, the belt 190 rotates in the pull-in direction, keeps the alignment while pressing the rear end of the sheet against the rear end stopper 131, and transfers the heat of the sheet to the heat radiation belt. Then, the heat radiation belt is cooled by the cooling fan 100 to radiate the heat, so that the heat of the sheets stacked on the processing tray 130 is removed.

Subsequently, one of the aligning members 141 and 142 is pushed (moving forward) to the aligning position in the direction intersecting the sheet feeding direction and the sheet pulling direction.

When the forward movement of the aligning member 141 (142) is completed, the aligning member is moved to the retracted position again (return operation). After the above operation is repeated up to the final sheet of the bundle, the stapler 101 staples the sheet bundle as necessary to staple the sheet bundle, and the swing guide 150 is closed to remove the sheet bundle by the bundle discharge roller pair 180. By the discharging operation, the sheet bundle is stacked on the stack tray 200. During the period from the alignment to the discharging to the stack tray, the heat radiation belt 190 is in contact with the upper surface of the discharged sheet bundle for cooling.

As described above, while the sheet is being conveyed to the processing tray and after the processing tray is loaded, the heat radiation belt is brought into contact with the sheet to cool the sheets, whereby the sheets are rapidly cooled and sticking between the sheets is prevented, so that a high quality image is obtained. Can be held.

The cooling belt 190 is used as the processing tray 13.
0 is brought into contact with the upper surface of the sheets stacked on 0 with a light pressure that does not impose a load for alignment movement. Thereby, the alignment member 1
Since the pressing force in the stopper direction can be continuously applied to the sheet even during the alignment movement of 41, the sheet alignment is improved.

The number of sheets stacked on the processing tray 130 is determined by the sheet detection sensor (counting means) shown in FIG.
Counted by 31.

Since the processing tray 130 is inclined as shown in FIG. 2, heat is accumulated at the trailing edge of the discharged sheet and is pressed by gravity when the sheets are stacked on the processing tray. As a result, the trailing edge of the discharged paper is the most difficult to dissipate heat, and is the place where the discharged paper is easily attached. Therefore,
Positively cooling the trailing end of the discharged sheet bundle as in this embodiment is a very effective means for preventing the discharged sheet adhesion.

Further, this embodiment employs a system in which a metal member is brought into contact with the sheet and cooled. This is because a higher cooling effect can be obtained than when the stacked sheets are directly cooled on the processing tray 130. The experimental results are shown in FIG.

The sheet bundle whose alignment has been completed on the processing tray 130 is stapled, discharged as a bundle as required, and transferred and stacked on the stack tray 200.

In the stapling mode, the stapler 101 waits in advance at a desired clinch position for the sheet bundle to be aligned, and staples when the final sheet of the bundle is ejected and its alignment is completed. is there.

(Second Embodiment) An image forming apparatus according to the second embodiment will be described with reference to FIGS. FIG. 5 is a schematic configuration diagram of a processing tray in the image forming apparatus for carrying out the present embodiment, and FIG. 6 is a thrust diagram corresponding to FIG.
The members having the same functions as those in the above-described embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In this embodiment, as shown in FIGS. 5 and 6, a heat pipe is used as the discharge roller 7B as a cooling means for the heat radiation belt 190. Further, as shown in FIG. 6, a radiation fin 198 is provided on the back side of the heat pipe roller 7B and is cooled by a fin cooling fan 199. This makes it possible to more reliably remove the heat taken by the heat dissipation belt 190 from the sheets during conveyance and after stacking the processing trays, prevent the sheets from adhering to each other on the stack tray 200, and always provide a high-quality image. it can.

Further, in this embodiment, a radiation fin 198 is provided for cooling the heat pipe, and this fin cooling fan 199 is provided.
However, the same effect can be obtained by cooling the heat pipe roller 7B by other means such as exposing one end of the heat pipe roller 7B to the outside air or applying it to a place where the temperature inside the machine is low.

[0070]

As described above, according to the present invention,
The sheet discharged to the stacking unit by the discharging unit is first cooled by the endless belt-shaped metal member during conveyance before being discharged to the stacking unit, and is most likely to be aligned even after being stacked on the stacking tray. By cooling the rear end of the sheet where sticking easily occurs, both upper and lower surfaces are rapidly cooled.

With the above operation, the high temperature sheet discharged from the high speed machine can be rapidly cooled, sticking between the sheets can be prevented, and a high quality image can always be provided.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing the overall configuration of a sheet processing apparatus of the present invention.

FIG. 2 is a side view of the sheet processing apparatus showing the first embodiment.

FIG. 3 is a side view of the sheet processing apparatus when the sheet is pulled in according to the first exemplary embodiment.

FIG. 4 is a thrust diagram of the sheet processing apparatus showing the first embodiment.

FIG. 5 is a side view of the sheet processing apparatus showing the second embodiment.

FIG. 6 is a thrust diagram of the sheet processing apparatus showing the second embodiment.

7 is an experimental result in Example 1. FIG.

FIG. 8 is a vertical sectional front view showing a schematic configuration of a conventional sheet processing apparatus.

FIG. 9 is a vertical sectional front view of an image forming apparatus including a sheet processing apparatus according to the present invention.

[Explanation of symbols]

1 sheet processing equipment 1'Image forming apparatus main body 7 First discharge roller pair (discharge means) 7B heat pipe roller 31 sheet detection sensor (counter) 100 cooling fan 130 Intermediate tray (processing tray, first stacking tray) 131 Rear end stopper (stopper part) 140 Matching means 141, 142 Alignment member (alignment means) 160 paddles 190 Heat dissipation belt 192 Towing actuator (towing means) 198 Fin 199 fin cooling fan 300 Image output unit of image forming apparatus main body 302 Main body discharge roller pair (main body discharge means) 310A Sheet processing apparatus control device (control means) 600 image forming unit (image forming means) P sheet (sheet bundle)

Claims (9)

[Claims] 1. A discharging means for discharging a sheet, a stacking means having a stopper portion for stacking sheets discharged by the discharging means and supporting an end portion of the sheet, and a contacting means for contacting the discharged sheet. In a sheet processing apparatus having an endless belt-shaped sheet pulling member which is stretched around a sheet discharge roller and is rotatable so as to pull in a sheet in the stopper direction, a cooling unit for cooling the sheet pulling member is provided. Characteristic sheet processing device. 2. The sheet processing apparatus according to claim 1, further comprising an alignment unit that aligns the sheets on the stacking unit by moving the sheets in a direction intersecting the sheet conveying direction. 3. A stapling device for binding sheets stacked on the stacking device.
Alternatively, the sheet processing apparatus according to claim 2. 4. The sheet processing apparatus according to claim 1, wherein the cooling means for cooling the sheet pull-in member is a member that abuts on the sheet pull-in member. 5. The sheet processing apparatus according to claim 1, wherein the cooling means for cooling the sheet pull-in member is an air blower. 6. The sheet processing apparatus according to claim 4, wherein the cooling unit is a heat pipe. 7. The sheet processing apparatus according to claim 6, wherein the heat pipe is used as a part or all of a sheet discharge roller in the sheet processing apparatus. 8. The sheet processing apparatus according to claim 1, wherein at least a part of the sheet pull-in member is made of a metal material. 9. The sheet processing apparatus according to claim 1, wherein the sheet pull-in member has a sheet-passable sheet size of substantially the entire width.