JP3614274B2 - Paper post-processing apparatus and image forming apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sheet post-processing apparatus connected to a sheet discharge unit of an image forming apparatus such as a copying machine, a printer, or a facsimile machine.And image forming apparatus including the sheet post-processing apparatusAbout.
[0002]
[Prior art]
A stipple unit for receiving paper discharged from the image forming apparatus into a stipple tray and subjecting the end portion thereof to a stipple process; There has been proposed a paper post-processing apparatus including a paper discharge tray that receives and stacks the discharged paper bundle and a driving unit that drives the paper discharge tray in the vertical direction.
In such a sheet post-processing apparatus, when the leading end of the stapled sheet bundle (the end opposite to the stapled end) is curled downward, the sheet is discharged to the discharge tray. The curled portion is bent or rounded and stacked on the sheet discharge tray surface.
Even when the paper size is large, the paper is thin, or even when the number of stapled papers is large, if there is a distance between the paper output unit and the paper output tray surface, it may also hang downward. It becomes the same state as.
[0003]
[Problems to be solved by the invention]
As described above, in the conventional paper post-processing apparatus, when the paper is curled downward, or depending on the size, type, and number of papers, the paper is discharged in a state where some of the papers are curled from the bottom. There is a problem that a stack of sheets is folded because the sheets are stacked on the tray. In addition, it is unnecessarily bulky in the height direction, and a predetermined number of copies cannot be stacked, resulting in a problem of poor stack efficiency.
[0004]
The present inventionSectionThe title is a paper post-processing device that can avoid stack failures and paper breaks in the stack of paper ejected onto the paper ejection tray.And image forming apparatusIs to provide.
[0005]
[Means for Solving the Problems]
UpLessonThe title isBe transportedPaperReceivedStocking, Multiple paperStipple processingRuHippurmeansWhen,TheTipped paper bundleCan move up and downOutput trayAndIn the paper post-processing device provided,When the stapled sheet bundle is discharged onto the paper discharge tray, the control means includes a control unit that temporarily raises the paper discharge tray to a predetermined upper position. If the number is larger than the predetermined number, the predetermined upper position is adjusted to a further upper position.This is solved by the first means.
An object of the present invention is to provide a stipple in a sheet post-processing apparatus including a stipple unit that receives a conveyed sheet and stipples a plurality of sheets, and a vertically movable discharge tray that stacks a bundle of stipulated sheets. A control unit that temporarily raises the discharge tray to a predetermined upper position when the discharged sheet bundle is discharged onto the discharge tray, and the control unit has a predetermined paper size of the stapled bundle of sheets. If the size is larger than the predetermined size, the second means for adjusting the predetermined upper position to a further upper position is solved.
In the first or second means, the above problem is solved by a third means in which the upper position is in the vicinity of the lower part of the discharge port for discharging the paper to the paper discharge tray.
The above problem is solved by the fourth means including the sheet post-processing apparatus of the first to third means.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0007]
FIG. 1 is a configuration diagram of the entire sheet post-processing apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view showing a driving mechanism for a jogger fence and a return roller, and FIG. 3 is a first example near the rear end fence portion. FIG. 4 is a perspective view centering on the staple device, FIG. 5 is a perspective view showing a state in which the bundle of sheets after binding is discharged by the discharge belt, and FIG. 6 is a sheet according to the embodiment of the present invention. It is a block diagram of the electrical equipment system of a post-processing apparatus.
[0008]
In FIG. 1, a paper discharge sensor 36, an entrance roller 1, and a branch claw 8 are provided at the entrance of a paper discharge conveyance path from the copying machine, and the paper (recording paper) going toward the paper discharge tray 12 by the branch claw 8 is provided. And the sheet going in the direction of the stipple device (stipple unit) 11 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.
The lower conveyance roller 4 is driven by a conveyance motor 54 which will be described later, and the paper discharge tray 12 is appropriately moved vertically and horizontally by a vertical motor 51 and a shift motor 52 which will be described later.
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 sheet bundle bound to a position 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.
As shown in FIG. 2, the jogger fence 9 is driven in the paper width direction by a jogger motor 26 via a jogger belt 49, and the return roller 5 is moved in a pendulum manner so as to come into contact with and separate from the paper surface by a return solenoid 30. It is configured to be.
[0009]
The brush roller 6 is rotated by the brush roller belt 47 in the direction of the arrow in FIG. As shown in FIG. 3, a rear end fence 19 for abutting against the rear end of the sheet is provided below the jogger fence 9.
As shown in FIG. 4, 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. The rear end fence 19 has fixed pieces 19a and 19b and movable pieces 19c and 19d that move together when the staple device 11 moves.
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.
Further, as shown in FIG. 5, the rear end of the sheet bundle bound by the staple device 11 is locked to the discharge claw 10 a provided on the discharge belt 10, and the rotation of the discharge belt 10 driven by the discharge motor 57. As a result, the paper is discharged to the paper discharge tray 12.
[0010]
Here, an 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 the switches and sensors in the sheet post-processing apparatus are input to the CPU 70 via the I / O interface 60. In accordance with the input signal, the CPU 70 moves the vertical 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, The jogger motor 26 is driven. The pulse signal of the transport motor 54 is input to the CPU 70 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 that operate the CPU 70.
[0011]
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 vertical alignment of the sheets is performed by the alignment roller 7 and 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, and improves the stacking property. Further, as the copied sheets are sequentially discharged, the paper surface lever 13 is raised (swings clockwise), which is detected by the paper surface sensor 33 and driven by the up / down motor 51 to eject the paper discharge tray 12. Is lowered and always kept at the proper height.
In the sort and stack modes, the paper discharge tray 12 is shifted left and right by the shift motor 52 in accordance with a partition signal output 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 millimeters.
[0012]
Next, a case where the stipple mode is selected will be described.
When the stipple mode is selected, as shown in FIG. 2, the jogger fence 9 moves from the home position and stands by at a position 7 mm away from the sheet width. When the sheet is conveyed by the lower conveyance roller 4 (driven by the conveyance motor 54) and the rear end of the sheet passes the sheet discharge sensor 37, the jogger fence 9 is jogged inward by 5 mm from the standby position (reciprocating movement in the arrow direction). I do.
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 solenoid 30 is turned on, the return roller 5 strikes the paper to return downward, and abuts against the rear end fence 19 to vertically align the paper. Each 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 the return solenoid 30 is turned off and a predetermined time has elapsed, the jogger fence 9 is moved inward by 2 mm by the jogger motor 26 and temporarily stopped, and the lateral alignment of the paper is completed. The jogger fence 9 then returns 7 millimeters and waits for the next sheet. This operation is performed up to the last page. On the last page, 7 mm jogging is performed again to prepare for the stipple operation by pressing both ends of the sheet bundle.
[0013]
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 movement motor 27 is driven, and the stipple device 11 is moved to the proper position along the rear end of the sheet, so that the second place is obtained. 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.
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, the jogger fence 9 is retracted 2 millimeters after a predetermined pulse from the discharge belt home sensor 39, 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 sheet bundle. From the end 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 is retracted in advance by 2 millimeters and discharged. In any case, when the sheet bundle passes through the jogger fence 9, the jogger fence 9 further moves 5 millimeters and returns to the standby position to prepare for the next sheet. Further, the binding force can be adjusted by the distance of the jogger fence 9 to the paper.
The above series of operations is repeated until the last job.
[0014]
FIG. 7 is a perspective view showing the discharge tray up / down mechanism.
As shown in FIG. 7, the paper discharge tray 12 is suspended by a vertical lift belt 48. The vertical lift belt 48 is driven by a vertical motor 51 via a gear train and a timing belt, and is lifted or lowered by normal rotation or reverse rotation of the vertical motor 51.
The home position of the paper discharge tray 12 and the height at the time of movement are detected by a paper surface lever 13 and paper surface sensors 32 and 33 that can rotate in the vertical direction, and when the paper discharge tray 12 is full of paper, the lower limit is reached. This is detected by the sensor 34. Furthermore, when the moving roller 7 is pushed up by the paper discharge tray 12 when the paper discharge tray 12 is raised, the upper limit switch 31 is turned off and the upper and lower motors 51 stop rotating, so that the paper discharge tray 12 is damaged due to overrun. Is preventing.
[0015]
FIG. 8 is a diagram illustrating a state of the sheet bundle stacked on the sheet discharge tray.
As described above, when the surface of the paper discharge tray 12 or the upper surface of the sheet bundle P1 already stacked on the paper discharge tray 12 in this example is considerably below the paper discharge portion, the next paper to be discharged When downward curl is generated in the bundle P2, as shown in the figure, this portion is stacked in a rounded state.
[0016]
In the present invention, when stacking a sheet bundle on the sheet discharge tray 12, the height of the sheet discharge tray 12 is always set upward, and when the rear end of the sheet bundle is discharged from the discharge roller 3, the sheet discharge tray 3 12 is moved down a predetermined distance. When a predetermined time elapses after the movement, the paper discharge tray 12 is moved upward again to prepare for the discharge of the next sheet bundle.
As described above, the discharge tray 12 is controlled so that the front end of the sheet bundle is always stacked on the discharge tray 12 at a high position. That is, the sheet bundle is stacked on the paper discharge tray 12 before the amount of sag is increased.
[0017]
FIG. 9 is a flowchart of the tray lowering check.
More specifically, it is a flowchart in which the state of the paper discharge tray 12 is checked and the home position of the paper discharge tray 12 is set.
[0018]
It is checked whether TRYUPF (tray up flag) is set to “1” (S1). If “1” (YES in S1), S7 is processed. In S7, “1” is set in SFUDJC and the process returns. When it is not “1” (NO in S1), S2 is processed.
In S2, it is checked whether the paper discharge tray 12 is moving up and down. If it is in operation (YES in S2), the process returns. If not in operation (NO in S2), the process of S3 is performed.
In S3, the state of the paper surface sensor 33 is checked. If the paper surface sensor 33 is off (NO in S3), TRYCKT (tray check timer) is cleared to “0” at S5 and the process returns. If the paper surface sensor 33 is on (YES in S3), the process of S4 is performed. TRYCKT (tray check timer) is counted up by a subroutine (not shown).
[0019]
In S4, it is checked whether TRYCKT (tray check timer) is larger than “5”. When TRYCKT (tray check timer) is smaller than “5” (NO in S4), the process returns. If TRYCKT (tray check timer) is greater than “5” (YES in S4), “5” is set in SFUDJC and the process returns.
The TRYCKT (tray check timer) delays the timing so that the paper surface sensor 33 is checked while the paper is being discharged and the next step is not performed. If the paper surface sensor 33 is turned on even after the value of TRYCKT (tray check timer) has passed “5” or more, it is determined that the paper surface position of the toilet is raised, and the tray is positioned.
[0020]
FIG. 10 is a diagram illustrating each subroutine of the paper discharge process.
More specifically, this is a subroutine for controlling the discharge roller 3 when discharging the staple-processed sheet bundle onto the discharge tray 12.
[0021]
The data set in EXJOBC (JOB counter) is checked. If EXJOBC (JOB counter) = 0, the process proceeds to the process EXIT0 shown in FIG. 11 and returns. If EXJOBC (JOB counter) = 1, The process proceeds to the process EXIT1 shown in FIG. 12. If EXJOBC (JOB counter) = 2, the process proceeds to the process EXIT2 shown in FIG. If JOB counter) = 4, the process proceeds to process EXIT4 shown in FIG. 15. If EXJOBC (JOB counter) = 5, the process proceeds to process EXIT5 shown in FIG.
[0022]
Next, the EXIT1 subroutine will be described.
FIG. 12 is a flowchart of the EXIT1 subroutine.
The rotation data of the discharge motor 55 that drives the discharge roller 3 is set to “100” (S11), the discharge motor 55 is turned on (S12), and “2” is set to EXJOBC (JOB counter). The timer TIM1CU is reset to “0” (S13) and the process returns.
[0023]
Next, the EXIT2 subroutine will be described.
FIG. 13 is a flowchart of the EXIT2 subroutine.
[0024]
It is checked whether the paper discharge sensor 38 is on or off (S21). If the paper discharge sensor 38 is on (YES in S21), “3” is set to EXJOBC (JOB counter), and the timers TIM1CU and TIM2CU are both reset to “0” (S22) and the process returns. The timers TIM1CU and TIM2CU are counted up by a subroutine not shown.
If the paper discharge sensor 38 is off (NO in S21), it is checked whether the timer TIM1CU exceeds “150” (S23). When TIM1CU is smaller than “150” (NO in S23), the process returns. If TIM1CU is larger than “150” (YES in S23), a subroutine for transmitting a jam signal to the image forming apparatus is called and the process returns.
[0025]
Next, the EXIT3 subroutine will be described.
FIG. 14 is a flowchart of the EXIT3 subroutine.
[0026]
It is checked whether the paper size is A3 or B4 (S31). In the case of A3 and B4 (YES in S31), it is checked whether or not the value of the sheet number counter STRYCU for counting the number of sheets stacked on the staple tray 21 is “16” or more (S32). When the value of the sheet number counter STRYCU is larger than “16” (YES in S32), it is checked whether the timer TIM2CU exceeds “50” (S33).
Each time a sheet is discharged to the staple tray 21, the content of the sheet number counter STRYCU is incremented.
[0027]
If the timer TIM2CU does not exceed “50” (NO in S33), the process returns. If the timer TIM2CU exceeds “50” (YES in S33), the rotation data “50” of the discharge motor 55 is set (S34), and then the EXJOB (JOB counter) is set to “4” in S35. Set and return.
When the value of the sheet number counter STRYCU is not "16" or more in S32, it is checked whether the timer TIM2CU has exceeded "40" (S36), and if not (NO in S36), the process returns. If it exceeds (YES in S36), go to S34.
[0028]
If NO in S31, it is checked in S37 whether the size is A4 vertical or B5 vertical. In the case of A4 vertical size and B5 vertical size (YES in S37), it is checked whether or not the value of the sheet number counter STRYCU is “25” or more (S38), and the value of the sheet number counter STRYCU is larger than “25”. If so (YES in S38), it is checked whether the timer TIM2CU exceeds "35" (S39).
If the timer TIM2CU does not exceed “35” (NO in S39), the process returns. When the timer TIM2CU exceeds “35” (YES in S39), the process goes to S34.
[0029]
If NO in S38, it is checked in S40 whether the timer TIM2CU exceeds “30”. When the timer TIM2CU does not exceed “30” (NO in S40), the process returns. When the timer TIM2CU exceeds “30” (YES in S40), the process goes to S34.
[0030]
If NO in S37, it is checked in S41 whether the timer TIM2CU exceeds “35”. If the timer TIM2CU does not exceed “35” (NO in S41), the process returns. When the timer TIM2CU exceeds “35” (YES in S41), the process goes to S34.
[0031]
As described above, the numbers “16” and “25” are entered at S32 and S38 for determining the contents of the sheet number counter STRYCU. These numbers are certain predetermined values. The numerical value where the numerical value of the timer TIM2CU is determined is also a predetermined value.
[0032]
Next, the EXIT4 subroutine will be described.
FIG. 15 is a flowchart of the EXIT4 subroutine.
[0033]
It is checked whether or not the paper discharge sensor 38 is off (S51). If the paper discharge sensor 38 is off (YES in S51), it is checked in S52 whether the paper size is A3 or B4.
In the case of A3 and B4 (YES in S52), it is checked whether or not the value of the sheet number counter STRYCU for counting the number of sheets stacked on the staple tray 21 is less than "5" (S53). When the value of the sheet number counter STRYCU is less than “5” (YES in S53), TRYUPF (tray up flag) is set to “1” in S54.
Next, in S55, “5” is set to EXJOBC (JOB counter), timer TIM1CU is reset to “0”, and the process returns. If the value of the sheet number counter STRYCU is not less than “5” in S53 (YES in S53), the process proceeds to S55.
[0034]
If NO in S52, it is checked in S56 whether the size is A4 vertical or B5 vertical. If the size is A4 portrait or B5 portrait (YES in S52), it is checked whether the value of the sheet number counter STRYCU is less than "10" (S57). If the value of the sheet number counter STRYCU is less than "10" (NO in S57) Proceed to S54. When the value of the sheet number counter STRYCU is not less than “10” (YES in S57), the process proceeds to S55.
[0035]
If NO in S56, it is checked in S58 whether the size is A4 horizontal or B5 horizontal. In the case of A4 horizontal size and B5 horizontal size (YES in S58), it is checked whether or not the value of the sheet number counter STRYCU is less than “10” (S59), and the value of the sheet number counter STRYCU is less than “10”. (YES in S59), the process proceeds to S54. When the value of the sheet number counter STRYCU is larger than “10” (NO in S59), the process proceeds to S55.
When NO in S58 (when A4 portrait or B5 portrait size is not), it is checked whether or not the value of the sheet number counter STRYCU is less than “15” (S60), and the value of the sheet number counter STRYCU is less than “15”. Advances to S54. If the value of the sheet number counter STRYCU is not less than “15”, the process proceeds to S55.
[0036]
If the paper discharge sensor 38 is not turned off in S51 (NO in S51), it is checked whether the timer TIM1CU exceeds “250” (S61). ). When the timer TIM1CU does not exceed “250” (NO in S61), the process returns. If the timer TIM1CU exceeds “250” (YES in S61), a subroutine for transmitting a jam signal to the image forming apparatus is called and the process returns.
[0037]
Next, the EXIT5 subroutine will be described.
FIG. 16 is a flowchart of the EXIT5 subroutine.
[0038]
It is checked whether the timer TIM1CU exceeds “200” (S71). If the timer TIM1CU does not exceed “200” (NO in S71), the process returns. If the timer TIM1CU exceeds “200” (YES in S71), the paper discharge motor 55 is turned off and the EXJOBC (JOB counter) is reset to “0” and the process returns (S72).
[0039]
FIG. 17 is a diagram showing each subroutine of tray control.
[0040]
In the subroutine for controlling the paper discharge tray 12, the data set in the SFUDFJC (JOB counter) is checked.
When SFUDJC (JOB counter) = 0, the process proceeds to the process SFTRY0 shown in FIG. 18 and returns. When SFUDJC (JOB counter) = 1, the process proceeds to the process SFTRY1 shown in FIG. 20 proceeds to the process SFTRY2 shown in FIG. 20, and if SUDJC (JOB counter) = 3, the process proceeds to the process SFTRY3 shown in FIG. If (JOB counter) = 5, the process proceeds to the process SFTRY5 shown in FIG. 23. If SFUDJC (JOB counter) = 6, the process proceeds to the process SFTRY6 shown in FIG.
[0041]
FIG. 19 is a flowchart of the SFTRY1 subroutine.
The vertical motor 51 that drives the discharge tray 12 up and down is turned on in the direction in which the discharge tray 12 descends (S81). At S82, SFUDJC is set to “2”, and timer UPJBT1 is set to “0” and cleared. The timer UPJBT1 is counted up by a subroutine not shown.
[0042]
FIG. 20 is a flowchart of the SFTRY2 subroutine.
It is checked whether the timer UPJBT1 exceeds “150” (S91). If the timer UPJBT1 exceeds “150” (YES in S91), the upper and lower motors 51 are turned off and “3” is set in SFUDJC (S92). If the timer UPJBT1 does not exceed “150” in S91 (NO in S91), it is checked whether the lower limit sensor 34 is on (S93).
When the lower limit sensor 34 is on (YES at S93), the process proceeds to S92, and when it is off (NO at S93), the process returns.
[0043]
FIG. 21 is a flowchart of the SFTRY3 subroutine.
The vertical motor 51 that drives the discharge tray 12 up and down is turned on in the direction in which the discharge tray 12 is raised (S101), "4" is set in SFUDJC, and timer UPJBT1 is set to "0" and cleared. (S102).
[0044]
FIG. 22 is a flowchart of the SFTRY4 subroutine.
It is checked whether or not the paper surface sensor 33 is turned on (S111). If the paper surface sensor 33 is on (YES in S111), the vertical motor 51 is turned off, and “4” is set in SFUDJC and the process returns (S112).
If the paper surface sensor 33 is off in S111 (NO in S111), it is checked whether the timer UPJBT1 exceeds “250” (S113). If the timer UPJBT1 does not exceed "250", go to NO and return. When the timer UPJBT1 exceeds “250” (YES in S), a subroutine for transmitting a jam signal to the image forming apparatus is called and the process returns.
[0045]
FIG. 23 is a flowchart of SFTRY5 subroutine.
The vertical motor 51 that drives the discharge tray 12 up and down is turned on in the direction in which the discharge tray 12 descends (S121), and “6” is set in SFUDJC and the timer UPJBT1 is cleared to “0”. (S122).
[0046]
FIG. 24 is a flowchart of the SFTRY6 subroutine.
It is checked whether or not the paper surface sensor 33 is (shifted) off (S131). If the paper surface sensor 33 is off (YES in S131), the vertical motor 51 is turned off, and "0" is set in SFUDJC and the process returns (S132). If the paper surface sensor 33 is turned on in S131 (NO in S131), it is checked whether the timer UPJBT1 exceeds “100” (S133).
If the timer UPJBT1 does not exceed “100”, go to NO and return. When the timer UPJBT1 exceeds “100” (YES in S), a subroutine for transmitting a jam signal to the image forming apparatus is called and the process returns.
[0047]
In such an embodiment, the paper discharged from the image forming apparatus is received in the staple tray 21 and the end portion thereof is stapled, and the staple unit is stapled. The rear side of the sheet is provided with a discharge belt 10 that discharges the sheet bundle to the outside of the staple tray 21, a discharge tray 12 that receives and stacks the discharged sheet bundle, and a vertical motor 51 that drives the discharge tray 12 in the vertical direction. In the processing apparatus, when the leading end of the stapled sheet bundle to be discharged next comes out from the surface of the paper discharge tray 12 or the upper surface of the paper already stacked on the paper discharge tray 12, the folded stack is caused by downward curling. The upper position is sufficient to avoid the situation, and the upper position releases the paper to the paper discharge tray 12. Since the sheet is near the lower side of the discharge opening, the sheet with the sheet discharged from the image forming apparatus curled downward with respect to the image surface is once stacked on the staple tray and subjected to the stipple process at the end of the sheet. After that, even if the paper bundle is discharged by the discharge means and the discharge means, the leading edge is not rounded and discharged, so that the curled paper can be prevented from being stacked in a curled state. And the paper folding defect can be eliminated.
In the embodiment, when the trailing edge of the sheet is discharged, the discharge tray 12 is moved downward by a predetermined distance, and when the predetermined time has elapsed after the movement, the discharge tray 12 is moved to an upper position. Thus, the paper discharged from the image forming apparatus is curled downward with respect to the image surface, once stacked on the staple tray 21, and subjected to stipple processing at the end of the paper, and the discharge means After the sheet bundle is discharged by the discharge means, the sheet discharge tray 12 is lowered, so that the sheet bundle can be reliably stacked up to the end fence of the sheet discharge tray 12.
In the embodiment, the position of the paper discharge tray 12 at the time of receiving the paper bundle is adjusted according to the number and size of the stapled paper. By slightly adjusting the value, the reliability can be further improved.
[0048]
【The invention's effect】
Claim1-3According to the described invention,When the paper that is being conveyed is curled downward with respect to the image surface, the paper is once stacked on the stipple tray, then stipulated on the paper, and then discharged to the paper output tray. As can be received before, when the number of stapled bundles of sheets is greater than a predetermined number or when the sheet size of the sheet bundle is larger than a predetermined size, the predetermined upper position is set to a further upper position. Adjust toby doing,As a detailed response that depends on the paper conditionFurthermore, reliability can be improved.
According to the invention described in claim 4, it is possible to provide an image forming apparatus that exhibits the effects of the invention described in claims 1 to 3.
[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 for a jogger fence and a return roller.
FIG. 3 is an enlarged configuration diagram showing a first example in the vicinity of a rear end fence portion.
FIG. 4 is a perspective view centering on a stipple device.
FIG. 5 is a perspective view illustrating a state in which a bundle of sheets after binding is discharged by a discharge 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 illustrating a discharge tray up / down mechanism.
FIG. 8 is a diagram illustrating a state of a sheet bundle stacked on a sheet discharge tray.
FIG. 9 is a flowchart of a tray lowering check.
FIG. 10 is a diagram illustrating subroutines for paper discharge processing.
11 is a flowchart of a subroutine (EXIT0) of FIG.
12 is a flowchart of a subroutine (EXIT1) of FIG.
13 is a flowchart of the subroutine (EXIT2) of FIG.
14 is a flowchart of a subroutine (EXIT3) of FIG.
FIG. 15 is a flowchart of a subroutine (EXIT4) of FIG.
16 is a flowchart of a subroutine (EXIT5) in FIG.
FIG. 17 is a diagram illustrating each subroutine of tray control.
FIG. 18 is a flowchart of the subroutine (SFTRY0) in FIG.
FIG. 19 is a flowchart of a subroutine (SFTRY1) in FIG. 17;
20 is a flowchart of a subroutine (SFTRY2) in FIG.
FIG. 21 is a flowchart of a subroutine (SFTRY3) in FIG. 17;
FIG. 22 is a flowchart of the subroutine (SFTRY4) of FIG.
FIG. 23 is a flowchart of a subroutine (SFTRY5) in FIG. 17;
24 is a flowchart of a subroutine (SFTRY6) in FIG.
[Explanation of symbols]
2 Upper transport roller
3 Discharge roller
4 Lower transport roller
5 Return roller
6 Paper feed roller
8 branch claws
9 Jogger fence
10 Release belt
10a Release claw
11 Stipple device (stipple unit)
12 Output tray
21 Stipple tray
51 Vertical motor

Claims (4)

Put accept the sheet conveyed, and stearyl Ipuru means you stippling a plurality of sheets,
In the sheet post-processing apparatus having a paper discharge tray vertically movable for loading the scan Tipuru treated sheet bundle,
Control means for temporarily raising the discharge tray to a predetermined upper position when discharging the stapled bundle of sheets onto the discharge tray;
The control means adjusts the predetermined upper position to a further upper position when the number of stapled bundles of stapled paper bundles is larger than a predetermined number . A stipple means for receiving the conveyed paper and stipling a plurality of paper;
In a paper post-processing apparatus having a vertically movable paper discharge tray for stacking a stapled paper bundle,
Control means for temporarily raising the discharge tray to a predetermined upper position when discharging the stapled bundle of sheets onto the discharge tray;
The control unit adjusts the predetermined upper position to a further upper position when the paper size of the stapled sheet bundle is larger than a predetermined size . 3. The sheet post-processing apparatus according to claim 1, wherein the upper position is near a lower portion of a discharge port that discharges the sheet to the paper discharge tray . An image forming apparatus comprising the sheet post-processing device according to claim 1.

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