JPH10139256A - Postprocessing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a discharge paper jam of a recording paper bundle, falling from a paper discharge tray or the like, and excellently discharge the recording paper bundle to the paper discharge tray by switching carrying speed of a discharge means according to the number of sheets and the size of recording paper stacked on a staple tray. SOLUTION: At staple mode time, recording paper discharged from an image forming device is once stacked on a staple tray 21, and after staple processing is performed on a recording paper end part, it is discharged to a paper discharge tray 12 by release means 10 and 10a and a discharge means 3. At this time, since the timing to switch carrying speed off the discharge means 3 is changed by the number of sheets and the size of the recording paper stacked on the staple tray 21, a discharge paper jam of a recording paper bundle and falling from the paper discharge tray 12 can be prevented, and the recording paper bundle can be excellently discharged to the paper discharge tray 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a post-processing apparatus for stapling recording paper discharged from an image forming apparatus such as a copying machine, a printer, a facsimile, and the like.

[0002]

2. Description of the Related Art Generally, in this type of post-processing apparatus, recording paper discharged from an image forming apparatus such as a copying machine, a printer, a facsimile or the like is stacked on a staple tray and stapled, and discharged by a discharge roller. It is configured to discharge onto a tray. Conventionally, this type of post-processing apparatus is configured to change the transport speed at the time of sheet discharge according to a sheet size signal, as shown in, for example, Japanese Patent Application Laid-Open No. 6-247612.

[0003]

However, in the conventional post-processing apparatus, if the timing for changing the transport speed at the time of discharging the paper is the same, when the paper is thin and the so-called stiffness is weak, the rear end of the paper is discharged. There is a problem that the paper remaining at the position of the paper roller or the paper discharged by the paper discharge roller passes over the paper discharge tray and falls to the floor.

An object of the present invention is to provide a paper discharge jam regardless of the type of paper, that is, the trailing end of the paper remains at the position of the paper discharge roller, or the paper discharged by the paper discharge roller passes over the paper discharge tray. It can be prevented from falling to the floor,
An object of the present invention is to provide a post-processing apparatus capable of satisfactorily discharging a recording sheet bundle to a discharge tray.

[0005]

The object of the present invention is to provide a recording sheet sorting means for receiving a recording sheet ejected from an image forming apparatus by moving a receiving tray for collecting and stacking the recording sheet in a direction perpendicular to the sheet discharging direction. A staple unit for stacking recording paper discharged from the image forming apparatus, a staple unit for performing staple processing on an end of the recording paper; and a staple tray, after the staple processing, moves the bundle of recording paper out of the staple tray. In a post-processing apparatus provided with a discharging unit for discharging, and a discharging unit for discharging a bundle of recording paper discharged by the discharging unit to the discharge tray, the number of recording sheets stacked on the staple tray is reduced. The first means for changing the timing of switching the transport speed of the discharging means in response thereto is solved. The above object is achieved by a recording sheet sorting unit that moves and receives a discharge tray for collecting and stacking recording sheets discharged from an image forming apparatus in a direction perpendicular to a sheet discharging direction, and a recording sheet discharged from the image forming apparatus. A stapling tray for stacking recording paper, and a stapling unit for stapling an end portion of the recording paper; a discharging unit for discharging a bundle of recording paper outside the stapling tray after the stapling; and a discharging unit. And a discharge unit for discharging the recording paper bundle discharged by the above to the paper discharge tray, wherein the conveying speed of the discharge unit is adjusted according to the size of the recording paper stacked on the staple tray. The problem is solved by the second means for changing the switching timing. The above object is achieved by the first means,
This problem is solved by a third means in which the timing for switching the transport speed of the discharge means is changed in accordance with the number and size of the recording sheets stacked on the staple tray. The above object is achieved by a recording sheet sorting unit that moves and receives a discharge tray for collecting and stacking recording sheets discharged from an image forming apparatus in a direction perpendicular to a sheet discharging direction, and a recording sheet discharged from the image forming apparatus. A stapling tray for stacking recording paper, and a stapling unit for stapling an end portion of the recording paper; a discharging unit for discharging a bundle of recording paper outside the stapling tray after the stapling; and a discharging unit. And a discharge unit for discharging the bundle of recording paper discharged by the discharge tray to the discharge tray, wherein the conveyance of the discharge unit is performed according to the number and size of the recording paper stacked on the staple tray. The problem is solved by a fourth means for switching the speed.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a control system of an embodiment of a post-processing apparatus according to the present invention. FIG. 2 is a block diagram showing the post-processing apparatus shown in FIG. 1, and FIGS. FIG. 5 is a block diagram showing a stapler moving mechanism of FIG. 2, FIG. 6 is a block diagram showing a sheet discharging mechanism of FIG. 2,
FIG. 7 is a configuration diagram showing the tray raising / lowering mechanism of FIG.

The CPU 70 shown in FIG. 1 controls the post-processing device, and particularly controls the discharge speed as shown in FIGS. The CPU 70 is connected to the copying machine via the interface 101 of the photocoupler, and receives a paper discharge signal, a recording sheet size, the number of jobs, a staple mode / shift mode mode signal, and the like from the copying machine. The CPU 70 controls the motor drivers 23a and 24a of the vertical motor 23 and the shift motor 24, the branch solenoid 53, the return solenoid 30, the transport motor 54, and the motor control circuit 55a of the paper discharge motor 55 as shown in detail in FIGS. Further, via the I / O port 60, the motor driver 56a of the staple motor 56, the servo control circuit 57a of the discharge motor 57, and the respective motor control circuits 2 of the stapler moving motor 27 and the jogger motor 26
7a and 26a are controlled. The pulse signal of the transport motor 54 is input to the CPU 70 and counted, and the solenoid 30 is controlled according to the count. The matching control means is constituted by the CPU 70 and various operation programs for operating the CPU 70.

Also, detection signals from various sensors and switches are sent to a CPU via a buffer 103 and an I / O port 60.
70. As various sensors and switches, as shown in detail in FIGS.
1, paper surface sensors 32 and 33, lower limit sensor 34, shift sensor (not shown) of paper discharge tray 12, entrance sensor 36,
Discharge sensor 37, discharge sensor 38, discharge claw home position sensor 39, stapler home position sensor 2
2 etc. are provided.

In FIG. 2, an entrance sensor 36, an entrance roller 1, and a branch claw 8 are provided at the entrance of a paper discharge conveyance path from a copying machine. The sheet which goes to the staple device 11 is separated. A plurality of upper transport rollers 2, a paper discharge sensor 38, a discharge roller 3,
A paper feed roller 7 for moving the paper to one side, a paper surface lever 13 that moves up and down by the loaded paper, a paper surface sensor 33 for detecting the height of the loaded paper, and the like are arranged. A paper ejection sensor 37, a paper feed roller (brush roller) 6, and the like are arranged.

The lower transport roller 4 is driven by a transport motor 54, and the discharge tray 12 is moved up, down, left and right by a vertical motor 23 and a shift motor 24 as appropriate.

The staple device 11 is provided below the staple tray 21. The staple tray 21 has a jogger fence 9 for aligning sheets, a return roller 5, and a stapling device located behind the jogger fence 9. Discharge belts 10 for discharging the stacked sheet bundle are arranged respectively. Reference numeral 39 denotes a discharge belt home sensor.

As shown in FIG. 3, the jogger fence 9 is driven in the width direction of the sheet by a jogger motor 26 via a jogger belt 49, and the return roller 5 is moved toward and away from the sheet surface by a return solenoid 30. It is configured to perform a simple pendulum motion.

The brush roller 6 is rotated by a brush roller belt 47 in a direction indicated by an arrow in FIG. As shown in FIG. 4, a rear end fence 19 is provided below the jogger fence 9 so as to contact the rear end of the sheet.

Further, as shown in FIG. 5, the stapling device 11 is driven by a stapler moving motor 27 via a stapling belt 50 and moves laterally. Reference numeral 22 denotes a stapler home sensor.

By the way, even if the paper discharge 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 is moved to the rear end of the paper at that timing. It is arranged at a position where it can be hit.

As shown in FIG. 6, the trailing end of the sheet bundle bound by the staple device 11 is
The release belt 10 is locked by the release claw 10a provided in the
The paper is discharged to the paper discharge tray 12 by the rotation of.

The tray 12 is suspended by a vertical lift belt 48 as shown in FIG. Vertical lift belt 4
8 is a vertical motor 2 via a gear train and a timing belt.
3 and is raised or lowered by the forward or reverse rotation of the vertical motor 23. The home position (HP) of the tray 12 and the height when the tray 12 is moved are detected by the lever 13 that can rotate in the vertical direction and the paper surface sensors 32 and 33,
Further, when the tray 12 is full of recording paper, it is detected by the lower limit sensor 34. Further, when the shifting roller 7 is pushed up by the tray 12 when the tray 12 is raised, the upper limit switch 31 is turned off, and the rotation of the vertical motor 23 is stopped, thereby preventing the tray 12 from being damaged by overrun.

Next, the operation of the above embodiment when the non-staple mode in which no stapling is 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 shift roller 7 and stacked on the paper discharge tray 12. At this time, when the sheet ejection sensor 38 detects the trailing edge of the sheet, the shifting roller 7 is decelerated to improve the stacking property. When the copied paper is sequentially discharged, the paper lever 13 is raised (swings clockwise), and this is detected by the paper surface sensor 33, and the discharge tray 12 is driven by the up / down motor 23. It is lowered and always kept at the proper height. In the sort and stack modes, the discharge tray 12 is shifted left and right by a shift motor 24 by a partition signal output from a control panel or the like of the apparatus main body, and sorting is performed until the end of the job. At the end of the job, the discharge tray 12 is lowered by about 30 mm so that the paper can be easily taken out.

Next, the case where the staple mode is selected will be described. When staple mode is selected,
As shown in FIG. 3, the jogger fence 9 moves from the home position and waits at a position 7 mm away from the sheet width on one side. The sheet is transported by the lower transport roller 4 (driven by the transport motor 54), and the trailing edge of the sheet is
After passing, the jogger fence 9 is 5mm from the standby position
Jogging inside (forward movement in the direction of the hatched arrow)
I do. Further, the paper discharge sensor 37 detects this at the time of passing the trailing edge of the paper, inputs the signal to the CPU 70, and outputs the signal to the CPU 70.
At 70, the number of transmission pulses from the transport motor 54 is counted from the time when this signal is received, and after transmitting a predetermined pulse, the return solenoid 30 is turned on. The return roller 5 performs a pendulum motion when the return solenoid 30 is turned on and off. When the return solenoid 5 is on, the return roller 5 hits the sheet and returns downward, and hits the rear end fence 19 to vertically align the sheet. At this time, every time the sheet stored in the staple tray 21 passes through the entrance sensor 36 (or the sheet ejection sensor 37), the signal is output as C.
The number of sheets is input to the PU 70 and counted.
After a lapse of a predetermined time after the return solenoid 30 is turned off, the jogger fence 9 is further moved inward by 2 mm by the jogger motor 26 (forward movement) and temporarily stopped, thereby completing the horizontal alignment of the paper. The jogger fence 9 then returns by 7 mm (return operation in the direction of the arrow) and waits for the next sheet. This operation is performed up to the last page. On the last page, jogging of 7 mm in the forward direction is performed again, and both ends of the sheet bundle are pressed to prepare for the stapling operation.

Then, after a predetermined time, the staple device 11
Operates to perform the binding process. At this time, if a plurality of bindings are specified, the stapling movement motor 27 is driven after the binding processing of one place is completed, and the staple device 11
Is moved to an appropriate position along the trailing edge of the sheet, and the second 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 differ depending on the size and the number of sheets to be bound. For example, when the number of sheets to be bound is smaller than the set number or smaller than the set size, the trailing end of the sheet bundle is hooked and conveyed by the ejection claw 10a while the sheet bundle is held by the jogger fence 9. After a predetermined pulse from the release belt home sensor 39, the jogger fence 9 is retracted by 2 mm (return operation), and the restraint on the sheet by the jogger fence 9 is released (this predetermined pulse causes the discharge claw 10a to collide with the rear end of the sheet bundle. After that, it passes through the tip of the jogger fence 9).
If the number of sheets to be bound is larger than the set number or larger than the set size, the jogger fence 9 must be
Retreat (return operation) and release. In any case, when the sheet bundle passes through the jogger fence 9, the jogger fence 9 further moves by 5 mm (return operation), returns to the standby position, and prepares for the next sheet. The binding force can be adjusted by appropriately setting the distance of the jogger fence 9 to the sheet. The above series of operations are repeated until the last job.

Next, features of the present invention will be described. In the staple mode, the recording paper discharged from the image forming apparatus is received, guided by the branch claw 8 toward the staple apparatus 11, and stacked on the staple tray 21. After stacking the recording paper on which the set document has been copied on the staple tray 21, the staple device 11 is operated to perform the binding process on the end of the recording paper bundle. When the binding process is completed, the ejection motor 57 is driven to drive the ejection belt 10. At this time, the paper discharge motor 55 is also driven, and starts rotating to receive the recording paper bundle lifted by the discharge claw 10a. The recording paper bundle is lifted by the ejection claw 10a and is conveyed to the discharge roller 3. The recording paper bundle is conveyed to the discharge tray 12 by the discharge roller 3 and the discharge claw 10a until the discharge claw 10a stops at a predetermined position. When the release claw 10a stops, the discharge rollers 3
To discharge the recording paper bundle to the discharge tray 12. The paper discharge roller 3 reduces the rotation speed of the paper discharge motor 55 driving the paper discharge roller 3 and the rotation speed of the paper discharge roller 3 at a preset timing to be described later, and discharges the recording paper. When the recording paper bundle is discharged to the paper discharge tray 12, the recording paper bundle is prevented from falling from the paper discharge tray 12.

Next, referring to FIGS.
A control operation of the discharge roller 3 when the stapled recording sheet bundle is discharged onto the discharge tray 12 will be described. Reference numeral 8 denotes control of the discharge roller 3 when the stapled recording sheet bundle is discharged onto the discharge tray 12. First, EXJ
The data set in the OBC (JOB counter) is checked (step S1 (hereinafter, “step” is omitted)). If EXJBC (JOB counter) = 0, the process proceeds to the processing EXIT0 shown in FIG. Return (S2, S11), EXJOBC (JOB counter) =
In the case of 1, the process proceeds to the process EXIT1 shown in detail in FIG. 10 (S3), and in the case of EXJOBC (JOB counter) = 2, the process proceeds to the process EXIT2 shown in detail in FIG.
4), if EXJOBC (JOB counter) = 3, the process proceeds to processing EXIT3 shown in detail in FIG. 12 (S5),
If XJOBC (JOB counter) = 4, the process proceeds to processing EXIT4 shown in detail in FIG. 13 (S6), and EXJOB
If C (JOB counter) = 5, the flow proceeds to processing EXIT5 shown in detail in FIG. 14 (S7).

In the processing EXIT1, as shown in FIG.
First, the rotation data of the paper discharge motor 55 for driving the paper discharge roller 3 is set to "100" (S21), then the paper discharge motor 55 is turned on (S22), and then EXJOBC
(JOB counter) is set to "2", and the timer TIM1CU is reset to "0" (S23), and then the process returns.

In the processing EXIT2, as shown in FIG.
First, it is checked whether the paper ejection sensor 38 is on (S
31). EXJOBC when the paper ejection sensor 38 is on
(JOB counter) is set to "3", and the timers TIM1CU and TIM2CU are both reset to "0" (S32), and the process returns. Here, the timer TI
M1CU and TIM2CU are simultaneously counted up at regular intervals by a subroutine (not shown). On the other hand, S
If the paper ejection sensor 38 is not on in step 31, it is checked whether the timer TIM1CU has exceeded "150" (S33). If YES, the jam signal is transmitted to the upstream image forming apparatus. (S34), and then returns. Also, S3
If the answer is NO in 3, the program returns.

In the processing EXIT3, as shown in FIG.
First, it is checked whether the size of the recording paper is A3 or B4 (S41). In the case of the A3 or B4 size, it is checked whether or not the value of a recording sheet number counter SRYCU for counting the number of recording sheets stacked on the staple tray 21 is "16" or more (S42), and YE
In the case of S, it is checked whether or not the timer TIM2CU> 50 (S43). Each time the sheet is discharged to the staple tray 21, the content of the recording sheet number counter STRYCU is incremented. If the timer TIM2CU is greater than 50, the rotation data of the discharge motor 55 is set to "50" (S44), and the EXJOBC (JOB counter) is set to "4" (S45), and the process returns. Accordingly, the rotation speed becomes lower than the rotation speed of the discharge motor 55 set in the flowchart of the processing EXIT3 of FIG. On the other hand, if the timer TIM2CU is not greater than 50 in S43, the process returns. If it is determined in S42 that the recording sheet number counter STRYCU is not equal to or greater than 16, it is checked whether or not the timer TIM2CU is greater than 40 (S4).
6) If YES, proceed to S44, whereas if NO, return as is.

If the size is not A3 or B4 in S41, it is checked whether the size is A4 vertical or B5 vertical (S47). Then, in the case of A4 portrait and B5 portrait sizes, it is checked whether or not the recording sheet number counter SRYCU ≧ 25 (S48), and in the case of YES, the timer TIM2CU is used.
It is checked whether or not> 35 (S49), and if YES, the process proceeds to S44, while if NO, the process returns. Each time the sheet is discharged to the staple tray 21, the content of the recording sheet number counter STRYCU is incremented. If it is determined in S48 that the recording sheet number counter STRYCU is not equal to or larger than 25, the timer TIM2CU is used.
It is checked whether or not> 30 (S50). If YES, the process proceeds to S44, while if NO, the process returns. If the size is not A4 portrait or B5 portrait size in S47 (NO in S41 and neither A3 size nor B4 size), it is checked whether timer TIM2CU> “35” (S52), and if YES, the process proceeds to S44. On the other hand, in the case of NO, the process returns.

As described above, the recording sheet number counter ST
The numbers "16" and "25" are entered at S42 and S48 for determining the contents of the RYCU, and these numbers are certain predetermined values. By changing this value, it is possible to set the number of sheets from which the deceleration timing is changed. When the number of the timer TIM2CU is changed,
The time to start deceleration after turning on 8 can be set. This number is a certain predetermined value. Therefore, the timing of changing the rotation speed of the discharge motor 55 is changed according to the value of the recording sheet number counter STRYCU for counting the number of recording sheets stacked on the staple tray 21 and the sheet size.

In the processing EXIT4, as shown in FIG.
First, it is checked whether the paper ejection sensor 38 is off (S
61). If YES, EXJOBC (JO
B counter) to “5” and the timer TIM
One CU is reset to "0" (S62), and the process returns. On the other hand, if the paper discharge sensor 38 is not off in S61, it is checked whether or not the timer TIM1CU> 250 has been exceeded (S63). If YES, a jam signal is transmitted to the upstream image forming apparatus. (S64), and then returns. If NO in S63, the process returns.

In the processing EXIT5, as shown in FIG.
First, it is checked whether or not the timer TIM1CU> 200 has been exceeded (S71). In the case of YES, the paper discharge motor 55 is turned off and EXJOBC (JO
B counter) is reset to "0" (S72), and the process returns. If NO in S71, the process returns.

In the above-described embodiment, in the staple mode, the recording paper discharged from the image forming apparatus is temporarily stacked on the staple tray 21, and the staple processing is performed on the end of the recording paper. Later, the release means (10, 1
0a) and when the sheet is discharged to the sheet discharge tray 12 by the discharge unit (3), the timing for switching the transport speed of the discharge unit (3) is changed according to the number and size of the recording sheets stacked on the staple tray 21. It is possible to prevent a paper bundle jam from being discharged, to fall from the paper discharge tray 12, and the like, and to discharge the recording paper bundle to the paper discharge tray satisfactorily.

FIG. 15 shows processing EXIT of the second embodiment.
3 ′ is shown. First, similarly to FIG. 12, it is checked whether the size of the recording paper is A3 or B4 (S81). When the size is A3 or B4, the timer TIM2CU is used.
It is checked whether or not> 60 (S82). In the case of YES, it is checked whether or not the value of the recording sheet number counter SRYCU for counting the number of recording sheets stacked on the staple tray is "16" or more. (S83). In addition,
Each time the sheet is discharged to the staple tray 21, the content of the recording sheet number counter STRYCU is incremented. If YES, the rotation data of the discharge motor 55 is set to "50" (S84), and then EXJOBC
(JOB counter) is set to "4" (S85), and the process returns (S86). As a result, FIG.
Becomes slower than the rotation speed of the discharge motor 55 set in the flowchart of the processing EXIT3.

On the other hand, if it is determined in S83 that the recording sheet number counter SRYCU is not 16 or more, the rotation data of the discharge motor 55 is set to "40" (S84), and then S8.
Go to 5. As a result, the rotation speed of the paper discharge motor 55 set in S84 becomes even slower. If the timer TIM2CU is not greater than 60 in S82, the process directly returns (S86).

If the size is not A3 or B4 in S81, it is checked whether the size is A4 portrait or B5 portrait (S88). Then, in the case of A4 portrait and B5 portrait sizes, it is checked whether the timer TIM2CU> 40 (S8).
9) If YES, recording sheet number counter STRYC
It is checked whether or not U ≧ 25 (S90). If YES, the rotation data of the paper discharge motor 55 is set to “35” (S91), and then the process proceeds to S85. Each time the sheet is discharged to the staple tray 21, the recording sheet number counter STRY
Increment the contents of the CU.

If the recording sheet number counter SRYCU is not equal to or larger than 25 in S90, the rotation data of the discharge motor 55 is set to "30" (S92), and then S8.
Go to 5. In S89, the timer TIM2CU>
If it is not 40, the process returns (S86).
If the size is not A4 portrait or B5 portrait in S88, it is checked whether timer TIM2CU> 35 (S88).
93), in the case of YES, the rotation data of the paper discharge motor 55 is set to “35” (S94), and then the process proceeds to S85. If the timer TIM2CU is not larger than 35 in S93, the process returns as it is (S86). Therefore, a recording sheet number counter STRYC that counts the number of recording sheets stacked on the staple tray 21.
The rotation speed of the paper discharge motor 55 is changed according to the value of U and the paper size.

In this case as well, the transport speed of the discharging means may be switched based on only one of the number and size of the recording sheets stacked on the staple tray.

In the second embodiment,
In the staple mode, the recording paper discharged from the image forming apparatus is temporarily stacked on the staple tray 21 and subjected to staple processing at the end of the recording paper.
10a) and the discharge unit (3), when the sheet is discharged onto the discharge tray 12, the transport speed of the discharge unit (3) is switched according to the number and size of the recording sheets stacked on the staple tray 21. It is possible to prevent a paper discharge jam, dropping from the paper discharge tray 12, and the like, and it is possible to satisfactorily discharge the recording paper bundle to the paper discharge tray.

[0037]

According to the first to third aspects of the present invention, in the staple mode, the recording paper discharged from the image forming apparatus is temporarily stacked on the staple tray, and the staple processing is performed on the end of the recording paper. After that, when the paper is discharged to the paper discharge tray by the discharge means and the discharge means, the number or the size of the recording sheets stacked on the staple tray, or the timing of switching the conveyance speed of the discharge means depending on the number and the size is changed. It is possible to prevent the paper jam of the recording paper bundle, dropping from the paper discharge tray, and the like, and it is possible to satisfactorily discharge the recording paper bundle to the paper discharge tray.

According to the fourth aspect of the present invention, in the staple mode, the recording paper discharged from the image forming apparatus is temporarily stacked on a staple tray, stapled at the end of the recording paper, and then discharged. When the sheet and the size of the recording sheets stacked on the staple tray are switched, the conveyance speed of the discharge unit is switched when the sheet is discharged to the sheet discharge tray by the unit and the discharge unit. It is possible to prevent the recording sheet bundle from dropping and the like, and to discharge the recording sheet bundle to the discharge tray in a satisfactory manner.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a control system of an embodiment of a post-processing device according to the present invention.

FIG. 2 is a configuration diagram illustrating a post-processing device of FIG. 1;

FIG. 3 is a configuration diagram illustrating the paper alignment mechanism of FIG. 2;

FIG. 4 is a configuration diagram illustrating the paper alignment mechanism of FIG. 2;

FIG. 5 is a configuration diagram illustrating the stapler moving mechanism of FIG. 2;

FIG. 6 is a configuration diagram illustrating a sheet discharging mechanism of FIG. 2;

FIG. 7 is a configuration diagram illustrating a tray raising and lowering mechanism of FIG. 3;

FIG. 8 is a flowchart for explaining a main routine of control processing of a discharge roller.

FIG. 9 is a flowchart illustrating a subroutine when job counter = 0 in FIG. 8;

FIG. 10 is a flowchart illustrating a subroutine when job counter = 1 in FIG. 8;

FIG. 11 is a flowchart illustrating a subroutine when job counter = 2 in FIG. 8;

FIG. 12 is a flowchart for explaining a subroutine in a case where job counter = 3 in FIG. 8;

FIG. 13 is a flowchart for explaining a subroutine when job counter = 4 in FIG. 8;

FIG. 14 is a flowchart for explaining a subroutine when job counter = 5 in FIG. 8;

FIG. 15 shows a job counter = 3 in the second embodiment.
9 is a flowchart for explaining a subroutine in the case of FIG.

[Explanation of symbols]

 3 Discharge Roller 11 Stipler 12 Discharge Tray 21 Stipple Unit 55 Discharge Motor 70 CPU

Claims (4)

[Claims] A recording sheet sorting unit configured to move and receive a discharge tray for collecting and stacking recording sheets discharged from the image forming apparatus in a direction perpendicular to a sheet discharging direction; and a recording sheet discharged from the image forming apparatus. A stapling unit having a staple tray for stacking sheets of paper, for stapling an end of the recording sheet, an ejection unit for ejecting a bundle of recording sheets outside the staple tray after the stapling, and the ejection And a discharge unit for discharging the bundle of recording paper discharged by the unit to the discharge tray. The conveying speed of the discharge unit according to the number of recording sheets stacked on the staple tray A post-processing device characterized in that the timing for switching between is changed. 2. A recording sheet sorting means for receiving and receiving a discharge tray for collecting and stacking recording sheets discharged from an image forming apparatus in a direction perpendicular to the discharge direction, and recording discharged from the image forming apparatus. A stapling unit having a staple tray for stacking sheets of paper, for stapling an end of the recording sheet, an ejection unit for ejecting a bundle of recording sheets outside the staple tray after the stapling, and the ejection And a discharge unit for discharging the bundle of recording paper discharged by the unit to the discharge tray. The conveying speed of the discharge unit according to the size of the recording paper stacked on the staple tray A post-processing device characterized in that the timing for switching between is changed. 3. The post-processing according to claim 1, wherein the timing for switching the transport speed of the discharge unit is changed in accordance with the number and size of the recording sheets stacked on the staple tray. apparatus. 4. A recording paper sorting means for receiving and receiving a discharge tray for collecting and stacking recording paper discharged from the image forming apparatus in a direction perpendicular to the discharge direction, and recording discharged from the image forming apparatus. A stapling unit having a staple tray for stacking sheets of paper, for stapling an end of the recording sheet, an ejection unit for ejecting a bundle of recording sheets outside the staple tray after the stapling, and the ejection And a discharge unit for discharging the bundle of recording sheets discharged by the unit to the discharge tray. The discharge unit according to the number of sheets of recording paper stacked on the staple tray and the size of the discharge unit. A post-processing device characterized in that the transport speed is switched.