JPH10297815A - Paper post-processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To normally stack a sheaf of paper sheets on a discharged paper tray without bringing it into contact with a carrying roller on a shaft coaxial with a brush roller in the case where the end of a sheaf of paper sheets is staple processed and discharged onto the discharged paper tray. SOLUTION: Discharge roller 90 for discharging a paper onto a staple tray and a brush roler 6 are coaxially arranged, and a brush roller 6 is provided outside the discharge roller 90. In the brush roller 6, the inside is formed as a high density bristle planting part 6a, and the outside is formed as a low density bristle planting part 6b, and the width of the part 6a is narrower than the width of the part 6b, and the diameter of the part 6a is made large. Thus, both the effective removal of a paper deflection near a rear end fence and the smooth alignment of paper sheets can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention includes a staple tray for receiving and aligning copied paper discharged from a paper discharge unit of an image forming apparatus, and a staple means for performing stapling processing on a bundle of paper on the staple tray. And a sheet post-processing device.

[0002]

2. Description of the Related Art A staple tray is disposed in a state of being inclined obliquely close to a vertical direction, and a sheet conveyed from an upstream portion is discharged upward along a staple tray surface by a conveyance (discharge) roller, and a rear end of the sheet is provided. There is widely known a sheet post-processing apparatus for dropping the sheet under its own weight onto a lower end of a staple tray and receiving the sheet by a rear end fence to align the sheet edges. In this sheet post-processing apparatus, the stapling process is performed by the stapling unit on the sheet edge aligned by the rear end fence while aligning the sheet in the width direction by the jogger fence. Then, the stapled sheet bundle is discharged to the discharge tray while the staple tray surface is moved upward by the discharging means. In such a sheet post-processing apparatus, the lower end of the sheet bundle discharged to the staple tray is regulated by the rear end fence, but the lower end portion is bent by its own weight and swells in a direction away from the staple tray surface. Sometimes. This results in a larger bending of a sheet having a weaker stiffness. There are also papers that have been swollen by back curl from the beginning.
In view of such a point, a brush roller for pressing the sheet against the staple tray surface to remove the deflection is employed.

[0003]

Since the above-mentioned brush roller needs to be provided at a position close to the staple tray surface and near the rear end fence, the brush roller is finally transported to discharge the sheet to the staple tray. In general, the roller is provided coaxially with a roller (discharge roller). Even if there is a brush roller, the bending or back curl due to the bending of the sheet cannot be completely removed. In such a case, during the process of moving the stapled sheet bundle upward along the staple tray surface, as described above, the swelled portion of the sheet comes into contact with the transport roller, and the toner adhered to the transport roller is transferred. Then, there is a problem that dirt is generated. In the worst case, a jam may occur due to contact with the transport roller.

A first object of the present invention is to staple an end portion of a sheet bundle ejected onto a staple tray and stacking the same number of sheets as the number of originals, and discharge the bundle to the discharge tray. Without contacting the transport rollers of
An object of the present invention is to provide a sheet post-processing device that can be normally stacked on a sheet discharge tray. A second object of the present invention is to improve the binding accuracy (paper alignment in the transport direction and the vertical direction) of a sheet bundle after stacking normally on a stack portion of a staple tray and stapling the end of the sheet bundle. An object of the present invention is to provide a sheet post-processing apparatus. A third object of the present invention is to improve the binding accuracy (paper conveyance direction and paper alignment in the direction perpendicular to the paper conveyance direction) of the paper bundle after stacking normally on the stack portion of the staple tray and stapling the end of the paper bundle. An object of the present invention is to provide a sheet post-processing apparatus which can improve the quality. A fourth object of the present invention is to provide a sheet post-processing apparatus capable of easily assembling two types of brush rollers and improving the assemblability and reducing the cost.

[0005]

The first object of the present invention is to provide a staple tray for receiving and aligning copied paper discharged from a paper discharge unit of an image forming apparatus, and a stapling process for a sheet bundle on the staple tray. And a brush roller for pressing a sheet bundle stacked on the staple tray against the staple tray surface to suppress a downward bending of the sheet bundle, and a flock density of the brush roller. Is solved by the first means that has two types. The first object is to provide a recording sheet sorting unit that moves a paper discharge tray for collecting copied paper discharged from a paper discharge unit of an image forming apparatus in a direction perpendicular to a paper discharge direction and receives the paper. A staple tray for receiving and aligning the copied paper discharged from the paper discharge unit of the apparatus, a beating roller unit for aligning the paper stacked in the staple tray in a direction perpendicular to the conveying direction, and a staple tray. A jogger unit for aligning the stacked sheets in a direction perpendicular to the conveying direction, a stapling unit for stapling a sheet bundle on a staple tray, and a discharge for releasing the sheet bundle out of the staple tray after stapling Means, and a sheet post-processing apparatus comprising: a discharge unit for discharging the sheet bundle discharged by the discharge unit to the discharge tray. A brush roller for pressing the bending of the lower side of the paper bundle is provided against Purutorei from stacked sheet bundle to the staple tray surface and the flocking density of the brush roller 2
This is solved by a second means. The first problem is that in the first and second means, the brush roller is
The brush roller is provided coaxially with a transport roller for loading paper into the staple tray, and the high density flocking portion of the brush roller having a higher flocking density is attached to both ends of the transport roller, and the lower density flocking portion having a lower flocking density is mounted. Is mounted on both ends of the high-density flocking portion. The second problem is that in the first to third means, the axial width of the high-density flocked portion of the brush roller having the higher flocked density is set to be smaller than the width of the low-density flocked portion having the lower flocked density. This is solved by the fourth means. The third problem is the first to fourth problems
In the means, the diameter of the high-density flocking portion of the brush roller having the higher flocking density is set to be larger than the diameter of the lower-density flocking portion having the lower flocking density. The fourth problem is solved by the first means, wherein the two kinds of brush rollers having different flocking densities are connected by a connecting member which can be fitted coaxially with the brush roller.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of an entire sheet post-processing apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view showing a driving mechanism of a jogger fence and a return roller, and FIG. 3 is a first example near a rear end fence. FIG. 4 is a perspective view mainly showing a stapling apparatus, FIG. 5 is a perspective view showing a state in which a bound sheet bundle is released by a release belt, and FIG.
1 is a block diagram of an electrical system of a sheet post-processing apparatus according to an embodiment of the present invention.

In FIG. 1, a paper discharge sensor 36, an entrance roller 1, and a branching claw 8 are provided at the entrance of a paper discharging and conveying path from a copying machine. Recording paper) and paper going in the stapling device (staple unit) 11 direction. A plurality of upper transport rollers 2 are provided on the transport path in the direction of the paper discharge tray 12.
A paper ejection sensor 38, an ejection roller 3, an approach roller 7 for approaching a sheet to one side, a sheet level lever 13 that moves up and down by a stacked sheet,
A paper surface sensor 33 for detecting the height of the stacked paper is disposed, and a plurality of lower transport rollers 4, a paper discharge sensor 37, a brush roller 6, and the like are disposed on the transport path in the direction of the stapling apparatus 11. The brush roller will be described later in detail. The lower transport roller 4 is provided with a transport motor 54 described later.
The discharge tray 12 is moved up, down, left, and right by a vertical motor 51 and a shift motor 52, which will be described later. The stapling apparatus 11 is provided below the staple tray 21. The staple tray 21 discharges a jogger fence 9 for aligning sheets, a return roller 5, and a bundle of sheets stapled behind the jogger fence 9. Discharge belts 10 are arranged. Reference numeral 39 denotes a discharge belt home sensor.

As shown in FIG. 2, the jogger fence 9 is driven by a jogger motor 26 in the width direction of the paper via a jogger belt 49, and the return roller 5 is brought into contact with and separated from the paper surface by a return solenoid 30. It is configured to perform a natural pendulum motion. Also, the brush roller 6
Is rotated by a brush roller belt 47 in the direction of the arrow in FIG. As shown in FIG. 3, a rear end fence 19 is provided below the jogger fence 9 for abutting the rear end of the sheet. Further, as shown in FIG. 4, the stapling device 11 includes a stapler moving motor 2.
7 is driven via the staple belt 50 and moves laterally. Reference numeral 22 denotes a stapler home sensor. The rear end fence 19 includes fixed pieces 19a and 19b and movable pieces 19c and 1 that move together when the stapling device 11 moves.
9d. By the way, even if the paper ejection sensor 37 detects the rear end of the paper and immediately issues an ON command to the return solenoid 30 to operate the return roller 5, the return roller 5 can strike the rear end of the paper at that timing. It is arranged in such a position that Further, as shown in FIG. 5, the trailing end of the sheet bundle bound by the stapling device 11 is locked by a discharge claw 10 a provided on the discharge belt 10, and the rotation of the discharge belt 10 driven by the discharge motor 57. Is discharged onto the paper discharge tray 12.

Here, the electrical system of the sheet post-processing apparatus according to the embodiment of the present invention will be described with reference to FIG. As shown in FIG. 6, signals from each switch and each sensor in the sheet post-processing device are input to the CPU 70 via the I / O interface 60. The CPU 70 controls the up / down motor 51, the shift motor 52,
The branch solenoid 53, the return solenoid 30, the transport motor 54, the paper discharge motor 55, the staple motor 56, the discharge motor 57, the stapler moving motor 27, and the jogger motor 26 are driven. The pulse signal of the transport motor 54 is CP
It is input to U70 and counted, and the return solenoid 30 is controlled according to this count. The paper alignment control means is constituted by the CPU 70 and various operation programs for operating the CPU 70.

Next, the operation of the above embodiment when the non-staple mode in which stapling is not performed is selected will be described. The copied paper is received by the entrance roller 1, sent by the upper transport roller 2, and discharged onto the discharge tray 12 by the discharge roller 3. Then, the paper is aligned in the vertical direction by the shifting roller 7 and stacked on the paper discharge tray 12. At this time,
The shifting roller 7 is decelerated when the sheet ejection sensor 38 detects the trailing edge of the sheet, thereby improving the stacking property. Further, as the copied paper is sequentially discharged, the paper surface lever 13 moves up (swings clockwise), and this is detected by the paper surface sensor 33.
Is detected, and the paper ejection tray 1 is
2 is lowered and always kept at the proper height. In the sorting and stacking modes, the paper output tray 1 is controlled by a partition signal output from a control panel of the apparatus main body.
2 is shifted left and right by the shift motor 52, and sorting is performed until the job is completed. At the end of the job, the discharge tray 12 is lowered by about 30 mm.

Next, the case where the staple mode is selected will be described. When staple mode is selected,
As shown in FIG. 2, the jogger fence 9 moves from the home position and waits at a position 7 mm away from the paper width on one side. When the sheet is conveyed by the lower conveying roller 4 (driven by the conveying motor 54) and the trailing end of the sheet passes the sheet discharge sensor 37, the jogger fence 9 jogs 5 mm inward from the standby position (reciprocating movement in the direction of the arrow). I do. Further, the paper discharge sensor 37 detects this at the time when the trailing edge of the paper has passed, and inputs the signal to the CPU 70. The CPU 70 counts the transmission pulses from the transport motor 54 from the time when this signal is received, and transmits a predetermined pulse. Thereafter, the return solenoid 30 is turned on. Return roller 5
Makes a pendulum motion when the return solenoid 30 is turned on and off. When the return solenoid 30 is turned on, it hits the sheet to return downward, and hits the rear end fence 19 to vertically align the sheet. Each time a sheet stored in the staple tray 21 passes through the entrance sensor 36 (or the sheet ejection sensor 37), the signal is sent to the CP.
The number is input to U70, and the number of sheets is counted. After a lapse of a predetermined time after the return solenoid 30 is turned off, the jogger fence 9 is moved inward by 2 mm by the jogger motor 26 and temporarily stopped, thereby completing the horizontal alignment of the sheet. The jogger fence 9 then returns 7 mm and waits for the next sheet. This operation is performed up to the last page. On the last page, jogging of 7 mm is performed again, and both ends of the sheet bundle are pressed to prepare for a stapling operation. Then, after a predetermined time, the stapling apparatus 11 is operated, and the binding process is performed. At this time, if a plurality of bindings are designated, after the binding processing at one location is completed, the staple moving motor 27 is driven, the stapling apparatus 11 is moved to an appropriate position along the rear end of the sheet, and A binding process is performed. When the binding process is completed, the ejection motor 57 is driven, and the ejection belt 10 is driven. At this time, the paper discharge motor 55 is also driven, and starts rotating to receive the sheet bundle lifted by the discharge claw 10a. At this time, the operation of the jogger fence 9 is controlled so as to vary depending on the size and the number of the jogger fences. For example, when the number of sheets to be stapled is smaller than the set number or smaller than the set size, the release claw 10a is pressed while the sheet bundle is pressed by the jogger fence 9.
To convey the trailing end of the sheet bundle.

After a predetermined pulse from the discharge belt home sensor 39, the jogger fence 9 is retracted by 2 mm to release the restraint on the sheet by the jogger fence 9 (this predetermined pulse is generated when the discharge claw 10a is moved to the rear end of the sheet bundle). After the collision, it is set during the time when it passes through the tip of the jogger fence 9). When the number of sheets to be stapled is larger than the set number or larger than the set size, the jogger fence 9 is retracted by 2 mm in advance, and the discharge is performed. In any case, when the sheet bundle passes through the jogger fence 9, the jogger fence 9 further moves by 5 mm and returns to the standby position to prepare for the next sheet. Further, it is also possible to adjust the binding force according to the distance of the jogger fence 9 to the sheet. The above series of operations are repeated until the last job.

FIG. 7 is a perspective view showing the paper ejection tray raising and lowering mechanism. The paper discharge tray 12 is suspended by a vertical lift belt 48 as shown in FIG. The vertical lift belt 48 is driven by a vertical motor 51 via a gear train and a timing belt, and is raised or lowered by forward or reverse rotation of the vertical motor 51. The home position and the height at the time of movement of the paper discharge tray 12 are detected by a paper surface lever 13 rotatable in the vertical direction and paper surface sensors 32 and 33. When the paper discharge tray 12 becomes full of paper,
This is detected by the lower limit sensor 34. Further, when the paper output tray 12 is raised, the shifting roller 7 is moved to the paper output tray 12.
When it is pushed up, the upper limit switch 31 is turned off, and the vertical motor 51 stops rotating, thereby preventing the discharge tray 12 from being damaged due to overrun.

Hereinafter, the configuration of the brush roller 6 of the present invention will be described. FIG. 8 is a diagram illustrating a state in which a large amount of bending has occurred in the sheet regulated by the rear end fence. FIG. 9 illustrates a state in which the bent portion of the sheet passes through the brush roller when moving the stapled sheet bundle. FIG. As described above, when the staple mode is selected, the paper is transported by the lower transport roller 4 by the number of set documents, and the discharge roller is coaxial with the brush roller 6 (described with reference to FIG. 10).
Is discharged to the staple tray 21. The discharged paper P is stacked on the rear end fence 19 as shown in FIG. 8, but when the paper has no stiffness or is back-curled (the center of the paper is bulging during receiving and transporting).
8, the lower end of the sheet P swells greatly in the direction away from the staple tray 21 and the rear end fence 19, as shown in FIG. After stapling the sheet bundle in this state, if the sheet bundle is to be moved above the staple tray 21 by the release claw 10a, the bending of the sheet bundle may be suppressed by the brush roller 6 as shown in FIG. However, the bent portion of the sheet bundle comes into contact with the discharge roller coaxial with the brush roller 6, and the toner attached to the discharge roller is transferred to the sheet bundle and becomes dirty.

Therefore, in the present invention, the brush roller 6 is connected to the brush roller 6 shown in FIG.
The configuration as shown in FIG. 0 ensures the function of suppressing the bending of the paper when the flat paper or the back-curled paper is stacked on the rear fence 19.

FIG. 10 is a perspective view of a brush roller and its periphery showing an embodiment of the present invention. Brush roller 6
Are provided coaxially with a pair of discharge rollers (conveying rollers) 90 and provided outside the pair. Each of the brush rollers 6 includes a high-density flocking portion 6a and a low-density flocking portion 6b. The side close to the discharge roller 90, that is, the inside is the high-density flocked portion 6a, and the outside is the low-density flocked portion 6b. Thus, the discharge roller 9
In the case where the number of sheets to be stapled is increased, the jogger fence 9 aligns the bundle of sheets, and the return roller 5
This does not hinder the vertical alignment of the stack of sheets.
That is, if the pressing of the paper by the brush roller 6 is strengthened, the gap between the papers is reduced, so that the friction between the papers is inevitably increased and the alignment is adversely affected. The density flocked portion 6a is provided at a position close to the discharge roller 90, the bending of the sheet bundle near the discharge roller 90 is minimized, and the low density flocked portion 6b is disposed outside the bundle. This is to reduce the pressure on the head and not to adversely affect the alignment.

FIG. 11 is a front view showing a brush roller and a coaxial discharge roller according to the embodiment of the present invention. As shown in FIG. 11, the width (length in the axial direction) a of the high-density flocking portion 6a is smaller than the width b of the low-density flocking portion 6b.

As described above, by setting the width of the high-density flocking portion 6a to the minimum width that satisfies the function of holding the sheet, the jogger fence 9 aligns the sheet bundle horizontally and the return roller 5
This does not hinder the vertical alignment of the stack of sheets.
Further, as is apparent from FIG. 11, the diameter of the high-density flocking portion 6a is smaller than the diameter of the low-density flocking portion 6b. This prevents the widthwise end of the paper from being caught on the brush roller 6.

The high density flocking portion 6a and the low density flocking portion 6
b are independent, and both are integrally connected by a coupling member 100 to form one brush roller 6.
The assembling method will be described. First, the high-density flocking portion 6a is inserted into the shaft, and then the coupling member 100 is inserted into the shaft. The connecting member 100 is inserted into the notch at the end of the high density flocking portion 6a.
Is fitted. After that, the low-density flocking portion 6b is inserted into the shaft, and the other end of the coupling member 100 is fitted into the notch at the end. Finally, the retaining ring 101 prevents the low-density flocked portion 6b from falling off the shaft. With such a configuration of the brush roller 6, improvement in assemblability and cost reduction are realized.

FIG. 12 is a view for explaining the operation of the brush roller of the present invention. After the paper is discharged from the discharge roller 90 coaxial with the brush roller 6, the paper is beaten by the return roller 5 and is stacked on the rear end fence 19. 6a sufficiently presses against the surfaces of the staple tray 21 and the rear end fence 19, and the bending (bulging) can be removed.

Further, by providing the high-density flocking portion 6a having a minimum width to suppress the bending (bulging) of the sheet bundle when the sheet bundle stacked on the rear end fence 19 is released, the low-density flocking portion is provided. Since the width of the sheet bundle 6b is increased and the pressing of the sheet bundle at unnecessary places is eliminated, if the bending (bulging) of the sheet bundle only around the conveying rollers is suppressed, the back surface stain of the sheet bundle at the time of ejection is reduced. Does not occur. Therefore, since there is a minimum gap between the sheets where no back surface contamination occurs at the time of ejection, the horizontal alignment of the sheet bundle by the jogger fence 9 and the vertical alignment of the sheet bundle by the return roller 5 are smoothly performed, and the sheet is bent. , That is, prevention of toner contamination of the sheet bundle and smooth alignment, that is, improvement of binding accuracy can be realized.

Further, since the outside of the high-density flocking portion 6a is the low-density flocking portion 6b and its diameter is small (the difference between the diameters is y), the timing of hitting the sheet discharged from the discharge roller 90 is most stable in terms of quality. The trailing edge of the paper sheet takes a path along the high-density flocking portion (dark brush roller) 6a with a high flocking density while contacting the trailing edge of the paper (corner of the paper). The rear end fence 19 does not contact the density flocking portion (thin brush roller) 6b.
Therefore, the rear end of the sheet, particularly the width direction end (the corner of the sheet) of the sheet does not come into close contact with the low density flocking portion 6b. Therefore, it does not get caught on the lash roller 6. For this reason, the sheet is efficiently removed from the deflection, and is smoothly abutted against the rear end fence 19 so that the edges are aligned.

As described above, in the embodiment of the present invention, the discharge roller 90 for discharging paper to the staple tray 21 and the brush roller 6 are arranged on the same axis, and the brush roller is disposed outside the discharge roller 90. 6 is provided. The brush roller 6 has a high density flocked portion 6a on the inside,
The outer side is a low density flocked portion 6b, the width of the high density flocked portion 6a is smaller than the width of the low density flocked portion 6b, and the diameter is increased. In this way, both the efficient removal of the bending of the sheet near the rear end fence 19 and the smooth alignment of the sheet can be realized. The high-density flocking portion 6a and the low-density flocking portion 6b are independent of each other, and are connected by the coupling member 100. By doing so, the assemblability can be improved.

[0024]

According to the first to third aspects of the present invention,
A high-density flocking portion having a high flocking density suppresses the bending (bulging) of the sheet bundle stacked on the staple tray, the bending of the back curl, and the like, and prevents toner contamination on (the back surface of) the sheet bundle due to the contact with the transport roller. Can be. According to the fourth aspect of the present invention, the narrow and high-density flocking portion causes the sheet bundle to deflect (bulge) only around the transport roller.
The wide and small low-density flocked section eliminates the pressing of the sheet bundle at unnecessary places while efficiently holding the sheet bundle, thereby suppressing the bending (bulging) of the sheet bundle only around the transport rollers. If it is, the back surface of the sheet bundle at the time of discharge will not be stained. Therefore, since there is a minimum gap between the sheets where no back surface dirt is generated at the time of ejection, the horizontal alignment of the sheet bundle by the jogger unit and the vertical alignment of the sheet bundle by the return roller are performed smoothly, so that the bending of the sheet is removed. That is, it is possible to realize both prevention of toner contamination of the sheet bundle and smooth alignment, that is, improvement of binding accuracy. Claim 5
According to the invention described above, the rear end of the paper, which stabilizes the timing of hitting the paper discharged from the discharge roller with the highest quality, takes a trajectory along the brush roller having a high flock density so as to follow the rear end of the paper. The (paper corner) is stacked on the trailing fence without contacting the brush roller with a small diameter and a small flocking density, so that the trailing edge of the paper, especially the corner of the paper, is prevented from being caught by the brush roller, and The alignment accuracy is improved. According to the sixth aspect of the invention, the two types of brush rollers are assembled by the connecting member, so that the assemblability can be improved and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an entire sheet post-processing apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a driving mechanism of a jogger fence and a return roller.

FIG. 3 is an enlarged configuration diagram showing a first example near a rear end fence.

FIG. 4 is a perspective view mainly showing a stapling apparatus.

FIG. 5 is a perspective view illustrating a state in which a bound sheet bundle is released by a release belt.

FIG. 6 is a block diagram of an electrical system of the sheet post-processing apparatus according to the embodiment of the present invention.

FIG. 7 is a perspective view showing a paper ejection tray raising / lowering mechanism.

FIG. 8 is a diagram illustrating a state in which a large bending occurs in the sheet restricted by the rear end fence.

FIG. 9 is a diagram illustrating a state in which a bent portion of a sheet passes through a brush roller when a stapled sheet bundle is moved.

FIG. 10 is a perspective view of a brush roller and its surroundings, showing an embodiment of the present invention.

FIG. 11 is a front view showing a brush roller and a coaxial discharge roller according to the embodiment of the present invention.

FIG. 12 is a diagram illustrating the operation of the brush roller of the present invention.

[Explanation of symbols]

 2 Upper conveying roller 4 Lower conveying roller 5 Return roller 6 Brush roller 6a High-density flocking portion 6b Low-density flocking portion 8 Branch claw 9 Jogger fence 10a Discharge claw 12 Paper discharge tray 19 Rear end fence 90 Discharge roller 100 Coupling member 101 Stopper ring

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Junichi Iida 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Company, Ltd. (72) Inventor Akito Ando 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Yoshihiko Nakayama 2-2-13-Nishiki, Naka-ku, Nagoya-shi, Aichi Ricoh Elemex Co., Ltd.

Claims (6)

[Claims] A staple tray for receiving and aligning copied paper discharged from a paper discharge unit of the image forming apparatus;
A sheet post-processing apparatus comprising: a stapling unit that performs stapling processing on a sheet bundle on the staple tray; And the brush roller has two types of flocking density. 2. A recording paper sorting unit for moving a paper discharge tray for collecting copied paper discharged from a paper discharge unit of the image forming apparatus in a direction perpendicular to a paper discharge direction and receiving the same, and A staple tray for receiving and aligning the copied paper discharged from the paper discharge unit; a beating roller unit for aligning the paper stacked in the staple tray in a direction perpendicular to the conveying direction; and a staple tray stacked in the staple tray. A jogger unit for aligning sheets in the direction perpendicular to the conveying direction of the sheet, a stapling unit for stapling the sheet bundle on the staple tray, and a discharging unit for discharging the sheet bundle after stapling to outside the staple tray. A sheet post-processing apparatus comprising a discharge unit for discharging a sheet bundle discharged by the discharge unit to the discharge tray; Paper post-processing apparatus characterized in that a brush roller is provided for pressing a bundle of sheets stacked on a staple tray against a staple tray surface to suppress deflection below the bundle of sheets, and the brush rollers have two types of flocking density. . 3. The brush roller according to claim 1, wherein the brush roller is provided coaxially with a transport roller that carries paper into the staple tray, and the brush roller has a higher density flocking portion with a higher flocking density. A sheet post-processing apparatus, which is mounted on both ends of a transport roller, and low-density flocking portions having a lower flocking density are mounted on both ends of the high-density flocking portion. 4. The brush roller according to claim 1, wherein the width of the brush roller in the axial direction of the higher-density flocked portion with a higher flock density is set smaller than the width of the lower-density flocked portion with a lower flock density. A paper post-processing device characterized by the above-mentioned. 5. The brush roller according to claim 1, wherein the diameter of the high-density flocked portion of the brush roller having a higher flock density is set to be larger than the diameter of the lower-density flock portion having a lower flock density. Paper post-processing device. 6. The paper post-processing apparatus according to claim 1, wherein two types of brush rollers having different flocking densities are connected by a connecting member that can be fitted coaxially with the brush rollers.