JP3732598B2 - Post-processing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a post-processing apparatus that staples recording paper discharged from an image forming apparatus such as a copying machine, a printer, or a facsimile.
[0002]
[Prior art]
Generally, in this type of post-processing apparatus, recording sheets discharged from an image forming apparatus such as a copying machine, a printer, and a facsimile are stacked on a staple tray and stapled, and discharged onto a discharge tray by a discharge roller. It is configured as follows. Conventionally, this type of post-processing apparatus is configured to change the conveyance speed at the time of paper discharge in accordance with a paper size signal, for example, as disclosed in JP-A-6-247612.
[0003]
[Problems to be solved by the invention]
However, in the conventional post-processing apparatus, if the timing for changing the conveyance speed at the time of paper ejection is the same, the rear edge of the paper remains at the position of the paper ejection roller when the paper is thin and the so-called waist is weak. There is a problem that the paper discharged by the paper roller passes over the paper discharge tray and falls to the floor.
[0004]
The problem of the present invention is that, regardless of the type of paper, the paper discharge jam, that is, the rear 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 and falls to the floor. It is an object of the present invention to provide a post-processing apparatus capable of preventing the recording paper bundle from being discharged onto the paper discharge tray.
[0005]
[Means for Solving the Problems]
  The above issuesBe transportedRecording paper sorting means for receiving and moving a paper discharge tray for collecting and stacking recording paper in a direction perpendicular to the paper discharge direction, and a stapling tray for stacking recording paper discharged from the image forming apparatus. A stipple unit for subjecting the end of the paper to a stipple process, a discharge means for discharging a bundle of recording paper to the outside of the staple tray after the stipple process, and a stack of recording paper discharged by the discharge means. A number of recording sheets stacked on the staple trayMore people with less thanThe conveying speed of the discharging means, Decelerate from the beginningTimingSlow down and slow downThis is solved by the first means.
  The above issuesBe transportedRecording paper sorting means for receiving and moving a paper discharge tray for collecting and stacking recording paper in a direction perpendicular to the paper discharge direction, and a stapling tray for stacking recording paper discharged from the image forming apparatus. A stipple unit for subjecting the end of the paper to a stipple process, a discharge means for discharging a bundle of recording paper to the outside of the staple tray after the stipple process, and a stack of recording paper discharged by the discharge means. A size of a recording paper stacked on the stipple trayThe larger one is smaller than the smaller one.The conveying speed of the discharging means, Decelerate from the beginningTimingSlow down and slow downThis is solved by the second means.
  The above problem is that, in the first means, the number and size of the recording sheets stacked on the staple trayThe larger and larger ones are less than the smaller ones,The conveying speed of the discharging means, Decelerate from the beginningTimingSlow down and slow downSolved by the third means.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
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 of FIG. 1, and FIGS. 3 and 4 show the paper alignment mechanism of FIG. FIG. 5 is a block diagram showing the stapler moving mechanism in FIG. 2, FIG. 6 is a block diagram showing the paper discharge mechanism in FIG. 2, and FIG. 7 is a block diagram showing the tray up-and-down mechanism in FIG.
[0007]
The CPU 70 shown in FIG. 1 controls the post-processing apparatus, and in particular, discharge speed control as shown in FIGS. The CPU 70 is connected to the copier via a photocoupler interface 101, and receives a paper discharge signal, a recording paper size, the number of jobs, a stipple mode / shift mode mode signal, and the like from the copier. The CPU 70 controls the motor control circuits 55a of the vertical motor 23 and the shift motor 24, the branch solenoid 53, the return solenoid 30, the transport motor 54, and the paper discharge motor 55 as shown in detail in FIGS. Furthermore, the motor driver 56a of the staple motor 56, the servo control circuit 57a of the discharge motor 57, the motor control circuits 27a and 26a of the jogger motor 26 are controlled via the I / O port 60. The pulse signal of the conveyance motor 54 is input to the CPU 70 and counted, and the solenoid 30 is controlled according to this count. The matching control means is constituted by the CPU 70 and various operation programs that operate the CPU 70.
[0008]
Further, detection signals from various sensors and switches are taken in by the CPU 70 via the buffer 103 and the I / O port 60. As shown in detail in FIGS. 2 to 7, the various sensors and switches include an upper limit switch 31, paper surface sensors 32 and 33, a lower limit sensor 34, a shift sensor (not shown) for the discharge tray 12, an inlet sensor 36, and a discharge sensor. 37, a discharge sensor 38, a discharge claw home position sensor 39, a stapler home position sensor 22, and the like.
[0009]
In FIG. 2, an inlet sensor 36, an entrance roller 1, and a branching claw 8 are provided at the entrance of the paper discharge conveyance path from the copying machine. The paper going in the direction is divided. The transport path in the direction of the paper discharge tray 12 includes a plurality of upper transport rollers 2, a paper discharge sensor 38, a discharge roller 3, a moving roller 7 that moves the paper to one side, a paper surface lever 13 that moves up and down by the stacked paper, and a stacked paper height A paper surface sensor 33 to be detected is disposed, and a plurality of lower transport rollers 4, a paper discharge sensor 37, a paper feed roller (brush roller) 6 and the like are disposed in the transport path in the direction of the staple device 11.
[0010]
The lower transport roller 4 is driven by a transport motor 54, and the paper discharge tray 12 is moved up and down and left and right as appropriate by a vertical motor 23 and a shift motor 24.
[0011]
The staple device 11 is provided below the staple tray 21, and the staple tray 21 includes a jogger fence 9 for aligning sheets, a return roller 5, and a bundle of sheets bound behind the jogger fence 9. The discharge belts 10 for discharging the water are respectively arranged. Reference numeral 39 denotes a discharge belt home sensor.
[0012]
As shown in FIG. 3, the jogger fence 9 is driven in the width direction of the paper by the jogger motor 26 via the jogger belt 49, and the return roller 5 is moved in and out of contact with the paper surface by the return solenoid 30. It is configured to be.
[0013]
The brush roller 6 is rotated by the brush roller belt 47 in the direction of the arrow in FIG. As shown in FIG. 4, a rear end fence 19 is provided below the jogger fence 9 to contact the rear end of the paper.
[0014]
Further, as shown in FIG. 5, the staple device 11 is driven by the stapler moving motor 27 via the staple belt 50 and moves laterally. Reference numeral 22 denotes a stapler home sensor.
[0015]
By the way, even if the sheet discharge sensor 37 detects the trailing edge of the sheet and immediately issues an ON command to the return solenoid 30 to operate the returning roller 5, the returning roller 5 can hit the trailing edge of the sheet at that timing. It is arranged at such a position.
[0016]
Further, as shown in FIG. 6, the rear end of the bundle of sheets bound by the stapler 11 is locked to a discharge claw 10a provided on the discharge belt 10, and discharged to the discharge tray 12 by the rotation of the discharge belt 10. It has come to be.
[0017]
The tray 12 is suspended by a vertical lift belt 48 as shown in FIG. The vertical lift belt 48 is driven by the vertical motor 23 via a gear train and a timing belt, and is lifted or lowered by forward or reverse rotation of the vertical motor 23. The home position (HP) of the tray 12 and the height at the time of movement are detected by a lever 13 that can be rotated in the vertical direction and the paper surface sensors 32 and 33. When the tray 12 is full of recording paper, the lower limit sensor 34 is detected. Is detected. Further, when the closing 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 vertical motor 23 stops rotating, thereby preventing the tray 12 from being damaged due to overrun.
[0018]
Next, in the above embodiment, the operation when the non-stipple mode in which stippling 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 paper discharge tray 12 by the discharge roller 3. Then, the alignment rollers 7 align the sheets in the vertical direction and are stacked on the sheet discharge tray 12.
At this time, the closing roller 7 is decelerated when the paper discharge sensor 38 detects the trailing edge of the paper, thereby improving the stacking property. Further, as the copied sheets are sequentially ejected, the paper surface lever 13 is raised (swings clockwise), and this is detected by the paper surface sensor 33. It is lowered and always kept at an appropriate height.
In the sort and stack modes, the paper discharge tray 12 is shifted left and right by the shift motor 24 by a partition signal issued from the control panel of the apparatus main body, and sorting is performed until the job is completed. At the end of the job, the paper discharge tray 12 is lowered about 30 mm so that the paper can be easily taken out.
[0019]
Next, the case where the stipple mode is selected will be described.
When the stipple mode is selected, as shown in FIG. 3, the jogger fence 9 moves from the home position and stands by at a position 7 mm away from the sheet width. When the paper is transported by the lower transport roller 4 (driven by the transport motor 54) and the rear end of the paper passes through the paper discharge sensor 37, the jogger fence 9 is jogged inward by 5 mm from the standby position (in the direction of the arrow with diagonal lines). Perform forward movement).
The paper discharge sensor 37 detects this when the trailing edge of the paper passes, and inputs the signal to the CPU 70. The CPU 70 counts the transmission pulse from the carry motor 54 from the reception time of this signal, and transmits a predetermined pulse. Later, 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 roller 30 is turned on, the return roller 5 strikes the paper and returns downward, and abuts against the rear end fence 19 to vertically align the paper. At this time, every time the paper stored in the staple tray 21 passes through the entrance sensor 36 (or the paper discharge sensor 37), the signal is input to the CPU 70, and the number of papers is counted.
After a predetermined time has elapsed 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 operation), temporarily stops, and the lateral alignment of the paper ends. The jogger fence 9 then returns 7 mm (reverse movement in the direction of the arrow) and waits for the next sheet. This operation is performed up to the last page. On the final page, the above-mentioned 7 mm jogging in the forward direction is performed again to prepare for the stipple operation by pressing both ends of the sheet bundle.
[0020]
Thereafter, the stipple device 11 is operated after a predetermined time, and the binding process is performed. At this time, if a plurality of bindings are designated, after the binding process at one place is completed, the stipple moving motor 27 is driven, and the stipple device 11 is moved to an appropriate position along the rear end of the sheet, so that the second place. A binding process is performed.
When the binding process is completed, the discharge motor 57 is driven to drive the discharge belt 10. At this time, the paper discharge motor 55 is also driven to start rotating to receive the sheet bundle lifted by the discharge claw 10a. At this time, the jogger fence 9 is controlled so that the operation differs depending on the size and the number of sheets to be bound.
For example, when the number of sheets to be bound is less than the set number or smaller than the set size, the trailing edge of the sheet bundle is hooked and conveyed by the discharge claw 10a while the sheet bundle is pressed by the jogger fence 9. Then, after a predetermined pulse from the discharge belt home sensor 39, the jogger fence 9 is retracted 2 mm (reverse operation), and the restriction of the paper by the jogger fence 9 is released (this predetermined pulse causes the discharge claw 10a to collide with the rear end of the paper bundle. Then, it is set after the tip of the jogger fence 9 is pulled out).
Further, when the number of sheets to be bound is larger than the set number or larger than the set size, the jogger fence 9 is retracted 2 mm in advance (reverse operation) and released.
In any case, when the sheet bundle passes through the jogger fence 9, the jogger fence 9 moves further 5mm (reverse operation) and returns to the standby position to prepare for the next sheet.
The restraining force can be adjusted by appropriately setting the distance of the jogger fence 9 to the paper.
The above series of operations is repeated until the last job.
[0021]
Next, features of the present invention will be described.
In the stipple mode, the recording paper discharged from the image forming apparatus is received, guided to the stipple apparatus 11 by the branching claw 8, and stacked on the stipple tray 21. After the recording sheets on which the set originals are copied are stacked on the staple tray 21, the stapling device 11 is operated to perform the binding process on the ends of the recording sheet bundle.
When the binding process is completed, the discharge motor 57 is driven to drive the discharge belt 10. At this time, the paper discharge motor 55 is also driven to start rotating to receive the recording paper bundle lifted by the discharge claw 10a.
The recording paper bundle is lifted by the discharge claw 10a and conveyed to the discharge roller 3. The recording paper bundle is conveyed to the paper 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 discharge claw 10a stops, the recording paper bundle is discharged onto the paper discharge tray 12 by the paper discharge roller 3.
The paper discharge roller 3 decelerates the rotation speed of the paper discharge motor 55 that drives the paper discharge roller 3 at a preset timing, which will be described later, and decelerates the rotation speed of the paper discharge roller 3, thereby The recording paper bundle is prevented from dropping from the paper discharge tray 12 when it is discharged to the paper discharge tray 12.
[0022]
Next, the control operation of the paper discharge roller 3 when the stapled bundle of recording sheets is discharged onto the paper discharge tray 12 by the CPU 70 will be described with reference to FIGS.
Reference numeral 8 denotes control of the discharge roller 3 when discharging the stapled bundle of recording sheets onto the discharge tray 12. First, the data set in EXJOBC (JOB counter) is checked (step S1 (hereinafter, “step” is omitted)). If EXJOBC (JOB counter) = 0, the process proceeds to processing EXIT0 shown in FIG. When the routine proceeds and returns (S2, S11) and EXJOBC (JOB counter) = 1, the processing proceeds to EXIT1 shown in detail in FIG. 10 (S3), and when EXJOBC (JOB counter) = 2, the processing is shown in detail in FIG. Proceeding to processing EXIT2 (S4), if EXJOBC (JOB counter) = 3, the processing proceeds to processing EXIT3 shown in detail in FIG. 12 (S5), and if EXJOBC (JOB counter) = 4, processing EXIT4 shown in detail in FIG. (S6), when EXJOBC (JOB counter) = 5, processing E shown in detail in FIG. Proceed to IT5 (S7).
[0023]
In the process EXIT1, as shown in FIG. 10, first, rotation data of the paper discharge motor 55 that drives the paper discharge roller 3 is set to “100” (S21), then the paper discharge motor 55 is turned on (S22), and then The EXJOBC (JOB counter) is set to “2”, the timer TIM1CU is reset to “0” (S23), and then the process returns.
[0024]
In the process EXIT2, as shown in FIG. 11, it is first checked whether or not the paper discharge sensor 38 is on (S31). When the paper discharge sensor 38 is on, EXJOBC (JOB counter) is set to “3”, the timers TIM1CU and TIM2CU are both reset to “0” (S32), and then the process returns. Here, the timers TIM1CU and TIM2CU are simultaneously counted up at regular intervals by a subroutine (not shown).
On the other hand, if the paper discharge sensor 38 is not on in S31, it is checked whether the timer TIM1CU exceeds “150” (S33). If YES, a jam signal is transmitted to the upstream image forming apparatus. Is called (S34), and then the process returns. If NO in S33, the process returns as it is.
[0025]
In the process EXIT3, as shown in FIG. 12, it is first checked whether or not the size of the recording paper is A3 or B4 (S41). In the case of A3 or B4 size, it is checked whether the value of the recording sheet number counter STRYCU for counting the number of recording sheets stacked on the staple tray 21 is “16” or more (S42). In this case, it is checked whether or not the timer TIM2CU> 50 (S43). Each time the sheet is ejected to the staple tray 21, the content of the recording sheet number counter STRYCU is incremented.
If the timer TIM2CU> 50, the rotation data of the paper discharge motor 55 is set to “50” (S44), then the EXJOBC (JOB counter) is set to “4” (S45), and then the process returns. As a result, the rotational speed of the paper discharge motor 55 set in the flowchart of the process EXIT3 of FIG. On the other hand, if the timer TIM2CU> 50 is not satisfied in S43, the process directly returns. If the recording sheet number counter STRYCU ≧ 16 is not satisfied in S42, it is checked whether or not the timer TIM2CU> 40 (S46). If YES, the process proceeds to S44, and if NO, the process directly returns.
[0026]
When it is not A3 and B4 size in S41, it is checked whether it is A4 vertical size or B5 vertical size (S47). If the size is A4 portrait or B5 portrait, it is checked whether the recording sheet number counter STRYCU ≧ 25 (S48). If YES, it is checked whether the timer TIM2CU> “35” (S49). If YES, the process proceeds to S44, and if NO, the process returns as it is. Each time the sheet is discharged to the staple tray 21, the content of the recording sheet number counter STRYCU is incremented.
If the recording paper number counter STRYCU ≧ 25 is not satisfied in S48, it is checked whether or not the timer TIM2CU> “30” (S50). If YES, the process proceeds to S44, and if NO, the process returns as it is. .
In S47, if it is not A4 vertical size or B5 vertical size (NO in S41 and neither A3 nor B4 size), it is checked whether or not timer TIM2CU> “35” (S52), and if YES, it goes to S44. On the other hand, if NO, return directly.
[0027]
As described above, the numbers “16” and “25” are entered at S42 and S48 for determining the contents of the recording sheet number counter STRYCU, and these numbers are certain predetermined values. By changing this value, you can set how many times the deceleration timing is changed.
Further, by changing the number at the timer TIM2CU, it is possible to set a time for starting deceleration after the paper discharge sensor 38 is turned on. This number is a certain predetermined value.
Therefore, the timing for changing the rotation speed of the paper discharge motor 55 is changed according to the value of the recording paper number counter STRYCU for counting the number of recording papers stacked on the staple tray 21 and the paper size.
[0028]
In the process EXIT4, as shown in FIG. 13, first, it is checked whether or not the paper discharge sensor 38 is off (S61). If YES, EXJOBC (JOB counter) is set to “5”, the timer TIM1CU is reset to “0” (S62), and then 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. Is called (S64), and then the process returns. If NO in S63, the process returns as it is.
[0029]
In the process EXIT5, as shown in FIG. 14, first, it is checked whether or not the timer TIM1CU> 200 is exceeded (S71). If YES, the paper discharge motor 55 is turned off and the EXJOBC (JOB counter) is reset to “0” (S72), and then the process returns. If NO in S71, the process directly returns.
[0030]
In the above-described embodiment, in the stipple mode, the recording paper discharged from the image forming apparatus is once stacked on the stipple tray 21, subjected to stipple processing at the end of the recording paper, and then discharged. When the discharge means (10, 10a) and the discharge means (3) are discharged to the discharge tray 12, the timing for switching the transport speed of the discharge means (3) according to the number and size of the recording sheets stacked on the staple tray 21 is set. Therefore, the recording paper bundle can be prevented from jamming, dropping from the paper discharge tray 12, and the like, and the recording paper bundle can be discharged to the paper discharge tray satisfactorily.
[0031]
FIG. 15 shows a process EXIT3 'according to the second embodiment. First, as in FIG. 12, it is checked whether the recording paper size is A3 or B4 (S81). If the size is A3 or B4, it is checked whether or not the timer TIM2CU> 60 (S82). If YES, the recording sheet number counter STRYCU for counting the number of recording sheets stacked on the staple tray is used. It is checked whether the value of “16” is “16” or more (S83). Each time the sheet is ejected to the staple tray 21, the content of the recording sheet number counter STRYCU is incremented. In the case of YES, the rotation data of the paper discharge motor 55 is set to “50” (S84), then EXJOBC (JOB counter) is set to “4” (S85), and then the process returns (S86). As a result, the rotational speed of the paper discharge motor 55 set in the flowchart of the process EXIT3 of FIG.
[0032]
On the other hand, if the recording sheet number counter STRYCU ≧ 16 is not satisfied in S83, the rotation data of the discharge motor 55 is set to “40” (S84), and then the process proceeds to S85. As a result, the rotational speed of the paper discharge motor 55 set in S84 is further delayed. If the timer TIM2CU> 60 is not satisfied in S82, the process directly returns (S86).
[0033]
If it is not A3 or B4 size in S81, it is checked whether it is A4 vertical or B5 vertical (S88). In the case of A4 vertical size and B5 vertical size, it is checked whether or not the timer TIM2CU> 40 (S89), and if YES, it is checked whether or not the recording paper number counter STRYCU ≧ 25 (S90). In this case, 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 ejected to the staple tray 21, the content of the recording sheet number counter STRYCU is incremented.
[0034]
If the recording sheet number counter STRYCU ≧ 25 is not satisfied in S90, the rotation data of the paper discharge motor 55 is set to “30” (S92), and then the process proceeds to S85. If the timer TIM2CU> 40 is not satisfied in S89, the process directly returns (S86). If it is not A4 vertical size or B5 vertical size in S88, it is checked whether or not the timer TIM2CU> 35 (S93). If YES, the rotation data of the paper discharge motor 55 is set to "35" (S94). Then, the process proceeds to S85. If the timer TIM2CU> 35 is not satisfied in S93, the process returns as it is (S86). Therefore, the number of rotations of the paper discharge motor 55 is changed according to the value of the recording sheet number counter STRYCU that counts the number of recording sheets stacked on the staple tray 21 and the sheet size.
[0035]
In this case as well, the conveying 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.
[0036]
In such a second embodiment, in the stipple mode, the recording paper discharged from the image forming apparatus is once stacked on the stipple tray 21 and subjected to stipple processing at the end of the recording paper. When discharging to the discharge tray 12 by the discharge means (10, 10a) and the discharge means (3), the transport speed of the discharge means (3) is switched according to the number and size of the recording sheets stacked on the staple tray 21. Therefore, it is possible to prevent the recording paper bundle from being jammed, dropped from the paper ejection tray 12, and the like, and the recording paper bundle can be satisfactorily discharged to the paper ejection tray.
[0037]
【The invention's effect】
  According to the first to third aspects of the invention, in the stipple mode,Being transportedThe number of recording sheets stacked on the staple tray when the recording sheets are once stacked on the staple tray and subjected to the stapling process at the end of the recording sheet and then discharged to the discharge tray by the discharge means and the discharge means. Or size, or number and sizeMany, or large, or many and large, less than smaller,Conveying speed of discharge means, Decelerate from the beginning and decelerate from the beginning to slow downSoAfter starting to discharge at the same transport speed, it decelerates faster as it becomes a larger weight as a paper bundle, preventing the paper sheet inertia from becoming difficult to stop at the paper output tray,The recording paper bundle can be prevented from jamming, dropping from the paper ejection tray, and the like, and the recording paper bundle can be discharged to the paper ejection tray satisfactorily.
[Brief description of 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.
2 is a configuration diagram showing a post-processing apparatus of FIG. 1; FIG.
FIG. 3 is a configuration diagram illustrating the paper alignment mechanism of FIG. 2;
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;
6 is a configuration diagram showing the paper discharge mechanism of FIG. 2;
7 is a configuration diagram showing the tray up-and-down mechanism of FIG. 3. FIG.
FIG. 8 is a flowchart for explaining a main routine of discharge roller control processing;
FIG. 9 is a flowchart for explaining a subroutine when job counter = 0 in FIG. 8;
FIG. 10 is a flowchart for explaining a subroutine when job counter = 1 in FIG. 8;
FIG. 11 is a flowchart for explaining a subroutine when job counter = 2 in FIG. 8;
FIG. 12 is a flowchart for explaining a subroutine when 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 is a flowchart for explaining a subroutine when job counter = 3 in the second embodiment;
[Explanation of symbols]
3 Discharge roller
11 Stipura
12 Output tray
21 Stipple unit
55 Discharge motor
70 CPU

Claims (3)

A recording paper sorting unit for collecting and stacking the transported recording paper in a direction perpendicular to the paper discharging direction and a stapling tray for stacking the recording paper discharged from the image forming apparatus are provided. And a stapling unit for stapling the end of the recording paper, a discharging means for discharging the recording paper bundle to the outside of the staple tray after the stippling, and the recording paper discharged by the discharging means In a post-processing apparatus provided with a discharge means for discharging the bundle to the discharge tray,
Than it is lesser lot of stacked sheets of recording paper on the staple tray, and characterized in that the transport speed of the discharge means, and in so that slows down to slow down the timing to decelerate from the beginning to discharge Post-processing device to do. A recording paper sorting unit for collecting and stacking the transported recording paper in a direction perpendicular to the paper discharging direction and a stapling tray for stacking the recording paper discharged from the image forming apparatus are provided. And a stapling unit for stapling the end of the recording paper, a discharging means for discharging the recording paper bundle to the outside of the staple tray after the stippling, and the recording paper discharged by the discharging means In a post-processing apparatus provided with a discharge means for discharging the bundle to the discharge tray,
Than towards the larger size of recording paper stacked on the staple tray is small, and characterized in that the transport speed of the discharge means, and in so that slows down to slow down the timing to decelerate from the beginning to discharge Post-processing device to do. 2. The timing of decelerating the discharge speed of the discharge unit from the beginning of discharge is slower than the smaller and smaller one of the number and size of recording sheets stacked on the staple tray. post-processing apparatus is characterized in that the so that slows down to.

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