JPH0826579A - Paper sheet after-treatment device - Google Patents

Abstract

PURPOSE:To enable paper sheets to be satisfactorily aligned in the longitudinal direction by regular beating motions of a return roller even if a number of paper sheet bundles to be aligned is increased. CONSTITUTION:It is a paper sheet after-treatment device equipped with a jogger fence 9 which aligns paper sheet bundles in the lateral direction, a rear edge fence 19 which standardizes the longitudinal direction of the paper sheet bundles, a return roller 5 which aligns the paper sheet bundles in the longitudinal direction, a paper sheet alignment mechanism provided with a stable device 11 for filing the paper sheet bundles, and a paper rejection sensor 37 which detects the rear edge of the paper sheets. It is also equipped with an alignment control means which controls the return roller 5 to start its motion after elapse of a specific time since detection of the rear edge of the paper sheets by the rejection sensor 37, the specific time being controlled to become longer correspondingly to the number of paper sheets to be stacked on the paper sheet alignment mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet aligning mechanism equipped in a copying machine or the like for aligning a discharged sheet bundle in the vertical and horizontal directions, and a stapling device for binding the aligned sheet bundle. The present invention relates to a sheet post-processing device that the user has.

[0002]

2. Description of the Related Art Conventionally, in a sheet post-processing apparatus (finisher) equipped in a copying machine or the like, a sheet bundle in which a plurality of sheets discharged from the copying machine are gathered in a vertical / horizontal direction by a sheet aligning mechanism. After aligning, binding is performed by the stapling device. This paper alignment mechanism is equipped with a jogger fence that aligns the paper in the horizontal direction, a trailing edge fence that serves as a reference in the vertical direction, and a return roller that aligns the paper in the vertical direction. Then, the return rollers 5 make a pendulum movement by hitting the paper P by turning a solenoid (not shown) on and off to move the paper horizontally, as shown in FIG. The paper is vertically aligned by hitting the end fence 19. In this operation, when the operation of the return roller interferes with the reciprocating motion (jogging) of the jogger fence, the horizontal alignment is significantly deteriorated. Therefore, the solenoid of the return roller is controlled to be turned off before starting the jogging. .

[0003]

However, in the above-described conventional sheet post-processing apparatus, if the operation start timing of the return roller is always constant, as shown in FIG. 11, many sheet bundles are aligned. Became (for example, 50)
At this time, the return roller 5 is tapped before the paper P is sufficiently separated from the paper feed roller (brush roller) 6, and the paper P does not go toward the trailing edge fence 19 and the paper of the paper feed roller 6 is not moved. There was a problem that the paper was pushed back in the direction of the conveyance path and the vertical alignment was not performed well, resulting in a backflow jam. In recent years, such a problem has arisen as the need to increase the standard value of the number of sheets to be bound by a sheet post-processing device, sorter stapler, etc. has increased. If, as a countermeasure against this, the paper feed speed is increased as a whole, the operation of the return roller 5 will be delayed, and there is a possibility of hitting and missing. Therefore, the present invention solves the above-mentioned conventional problems, and provides a sheet post-processing apparatus that can properly perform vertical alignment of sheets by a return roller even when the number of aligned sheet bundles increases. The task is to do.

[0004]

The gist of the present invention is, in claim 1, a jogger fence for aligning a discharged sheet bundle in the horizontal direction, a rear end fence serving as a vertical reference, and a vertical alignment. A sheet aligning mechanism having a return roller for performing binding, and a staple device for binding the aligned sheet bundle, and a sheet discharge sensor for detecting the trailing end of the sheets sent to the sheet aligning mechanism, and the operation for aligning the sheet bundle. Timing control,
In a sheet post-processing device that performs each sheet by detecting the trailing edge of the sheet by the sheet ejection sensor, control is performed so that the return roller starts to operate after a predetermined time has elapsed since the sheet ejection sensor detected the sheet trailing edge. That is, the matching control means is provided.

According to a second aspect of the present invention, the alignment control means controls the predetermined time so that the predetermined time becomes longer in accordance with an increase in the number of sheets stacked on the sheet alignment mechanism. Then, the alignment control means controls the stepwise extension of the predetermined time each time the number of sheets stacked on the sheet alignment mechanism reaches a predetermined number. The sheet discharge sensor is arranged at a position where the sheet can be aligned with the return roller even when the ON instruction is issued to the return roller immediately after detecting the trailing edge of the sheet.

[0006]

Therefore, in claims 1 and 2, when the paper discharge sensor detects the trailing edge of the paper, the signal is input to the alignment control means, and the alignment control means receives the predetermined time after the detection of the trailing edge of the paper. , The return roller is controlled to start operating. At this time, the predetermined time is controlled so as to increase as the number of sheets stacked in the sheet aligning mechanism increases. As a result, even if the number of sheets of paper stored is large, the return roller tapping operation is always performed under the same conditions.

In the third aspect, the alignment control means lengthens the predetermined time each time the number of sheets stacked in the sheet alignment mechanism reaches a predetermined number.
That is, the predetermined time is controlled to gradually increase as the number of sheets increases. Thereby, the counting of the predetermined time is performed more stably. Further, in claim 4, even when the paper discharge sensor detects the trailing edge of the sheet and immediately issues an ON command to the returning roller, the trailing edge of the sheet is hit by the returning roller to be aligned. It is arranged on the sufficiently close upstream side, and even if the conveyance of the sheet is delayed due to an operation error on a machine or a circuit, the error is sufficiently absorbed.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a paper discharge sensor 36, an entrance roller 1, and a separation claw 8 are provided at the entrance of a paper discharge conveyance path from a copying machine (not shown). , The paper going toward the stapling device 11 is separated. The upper conveyance roller 2, the paper ejection sensor 38, the ejection roller 3, the shifting roller 7, the paper surface lever 13, the paper surface sensor 33, and the like are arranged on the conveyance path in the direction of the paper ejection tray 12, and the conveyance path in the direction of the stapling apparatus 11 is A lower conveyance roller 4, a paper discharge sensor 37, a paper feed roller (brush roller) 6 and the like are arranged. The lower carrying roller 4 is driven by a carrying motor 54 described later, and the paper discharge tray 12 is appropriately moved vertically and horizontally by a vertical motor 51 and a shift motor 52 described later. The stapling device 11 is provided below the staple tray 51. The staple tray 51 discharges a jogger fence 9 for aligning sheets, a return roller 5, and a bundle of sheets bound to the position behind the jogger fence 9. Discharging belts 10 are provided for each.

As shown in FIG. 2, the jogger fence 9 is driven by a jogger motor 26 via a jogger belt 49, and the return roller 5 is pendulum-moved by a return solenoid 30. Below the jogger fence 9, as shown in FIG. 3, a rear end fence 19 for abutting a bundle of sheets is provided. Further, as shown in FIG. 4, the stapler device 11 is laterally moved by being driven by a stapler moving motor 27 via a staple belt 50.

By the way, even when the sheet discharge sensor 37 detects the trailing edge of the sheet and immediately issues an ON command to the returning solenoid 30 to activate the returning roller 5, the returning roller 5 strikes the trailing edge of the sheet. It is placed in a position where it can be applied. In this embodiment, the sheet discharge sensor 37 issues an ON command to the return roller 5, and it takes about 100 ms until the return roller 5 operates, and the sheet conveyance speed is 800 mm / s on average. Is arranged at a position 80 mm upstream of the paper feed roller 6.

Next, the circuit configuration of the microcomputer incorporated in the sheet post-processing apparatus will be described. Figure 5
As shown in, the signals from the switches and sensors on the control panel (not shown) of the main body of the apparatus are I / O.
CPU (Central Processing Unit) via interface 60
It is input to 70. The CPU 70 responds to the input signal by the vertical motor 51 of the discharge tray 12, the shift motor 52, the switching solenoid 53 (for the branch claw 8), the return solenoid 30, the transport motor 54, the paper discharge motor 55, and the staple motor 56. , Discharge motor 57 (discharge belt 10
), Stapler moving motor 27, jogger motor 26
Drive. The pulse signal of the carry motor 54 is sent to the CPU 7.
The value is input to 0 and counted, and the return solenoid 30 is controlled according to this count. The matching control means is CP
It is composed of various operation programs for operating the U 70 and the CPU 70.

In the above structure, first, the operation when the non-staple mode in which no stapling is performed is selected will be described. The copied sheet is received by the entrance roller 1, sent by the upper conveying roller 2, discharged by the discharge roller 3, and aligned by the shifting roller 7 in the vertical direction, and stacked on the discharge tray 12. At this time, the approach roller 7 is decelerated when the sheet ejection sensor 38 detects the trailing edge of the sheet, and the stacking property is improved. Further, when the copied sheets are sequentially ejected, the ejection tray 12 is moved by the vertical motor 5 by the paper surface lever 13 and the paper surface sensor 33.
A drive of 1 always keeps the proper height. Further, in the sort and stack modes, according to a partition signal output from the control panel or the like of the apparatus main body, the discharge tray 12 is shifted by the shift motor 52 to carry out sorting until the end of the job.
Down about 0 cm.

Next, the case where the staple mode is selected will be described. When staple mode is selected,
As shown in FIG. 2, the jogger fence 9 moves from the home position and stands by at a position where one side is 7 mm away from the paper width. The sheet is conveyed by the lower conveyance roller 4 (driven by the conveyance motor 54), and the rear end of the sheet is ejected by the sheet ejection sensor 37.
After passing through, the jogger fence 9 is 5mm from the standby position.
Jogging (reciprocating movement in the direction of the arrow) is performed inside. or,
The paper discharge sensor 37 detects it at the time when the trailing edge of the paper passes and inputs the signal to the CPU 70. The CPU 70 counts the pulses transmitted from the carry motor 54 from the time when the signal is received, and after the predetermined pulse is transmitted. Return solenoid 3
Turn 0 on. The return roller 5 makes a pendulum motion when the return solenoid 30 is turned on and off. When the return roller 5 is turned on, the sheet is struck to return the sheet downward and hit the trailing edge fence to align the sheets vertically.

At this time, the paper stored in the staple tray 51 is the paper discharge sensor 36 (or the paper discharge sensor 37).
The signal is input to the CPU 70 each time
The number of sheets is counted. In the CPU 70, every time when the number of sheets reaches a predetermined number, the count number of pulses transmitted from the carry motor 54 is increased stepwise, and as the number of sheets increases, the sheet discharge sensor 37 causes the sheet rear end to move. It is controlled so as to lengthen the time from the detection of the time when the return solenoid 30 is turned on.

For example, as shown in FIG. 6, each time the number of sheets stored in the staple tray 51 increases by 10, the pulse count number is incremented by one. The turn-on time of the return solenoid 30, that is, the operation time of the return roller 5 is during the transmission of a predetermined pulse of the transmission pulse from the carry motor 54, and the on-state is maintained during that period, and when the vertical alignment is completed, the return solenoid is completed. 30 is turned off. After a predetermined time elapses after the return solenoid 30 is turned off, the jogger fence 9 is moved inward by 2 mm by the jogger motor 26 and once stopped, the horizontal alignment is completed. The jogger fence 9 then returns 7 mm and waits for the next sheet.
This operation is repeated until the final page. On the final page, jogging of 5 mm is performed again, and the trailing edge of the paper is pressed to prepare for the stapling operation.

On the other hand, as shown in FIG. 4, the stapling apparatus 11 is moved by a stapler moving motor 27 to an appropriate position depending on the size of paper and the type of binding (in the direction of the arrow).
To be done. During the sheet alignment, the printer waits at that position, and when the alignment of the final page is completed, the stapling operation is performed. When the vertical alignment of the sheet bundle is completed by the return roller 5 and the horizontal alignment is started after the elapse of the predetermined time, the retracting of the return roller 5 is delayed as the sheet bundle becomes thicker, that is, the number of sheets increases. Since the horizontal alignment operation interferes with the horizontal alignment operation, the predetermined time is controlled so as to increase as the number of sheets increases, and the return roller 5 has a retreat margin. You can also

Next, the operation of the return solenoid 30 will be described with reference to the flow chart of the program for operating the microcomputer. In FIG. 7, SOLJC
Is a job counter for controlling the return solenoid 30 (return roller control routine), and SOLJB0, SOL is set according to data 0, 1, 2 set in SOLJC.
It is processed by jumping to the subroutines of JB1 and SOLJB2. SOLJB0 is a return.

As shown in FIG. 8, the SOLJB 1 checks the size of the transfer sheet in steps 1 and 2, and checks in step 3 and 4 how many sheets are stored in the staple tray 51. In this example, it is checked whether the number is 30 or more. By changing this value, the operation timing of the return solenoid 30 changes. Steps 5-9
Then, the count value of the pulse counter (PLSC) of the carry motor 54, which is started when the discharge sensor 37 detects the trailing edge of the sheet, is determined. In step 10, the return solenoid 30 is turned on and the solenoid on timer (S
The contents of (OLONT) are cleared to 0, and the return solenoid 30
2 is set to the job counter (SOLJC) that controls the SOLJB2, and the process proceeds to the SOLJB2 subroutine. As shown in FIG. 9, this SOLJB2 determines whether the content of the solenoid-on timer (SOLONT) is larger than the set value 50 in step 1,
If YES, the return solenoid 30 is turned off in step 2, the job counter (SOLJC) controlling the return solenoid 30 is set to 0, and the return roller control routine returns. This completes a series of operations of the return solenoid 30 for the sheet bundle.

[0019]

As described above, the first and second aspects are provided.
According to the above, after the paper ejection sensor detects the trailing edge of the paper,
An alignment control unit that controls the return roller to start operating after a lapse of a predetermined time is provided, and the predetermined time is controlled to increase as the number of sheets stacked in the sheet alignment mechanism increases. Regardless of the number of sheets stored in the staple tray, even if the number of sheets is 50 or more, the return roller is always tapped under the same conditions to prevent backflow jam and misalignment. Therefore, the vertical alignment of the sheets can be performed well.

In the third aspect of the invention, the alignment control means controls the stepwise extension of the predetermined time each time the number of sheets stacked in the sheet alignment mechanism reaches a predetermined number. When the predetermined time is lengthened correspondingly to the number of sheets of paper, it is necessary to reduce the pulse width (of the motor pulse), the number of counts increases, and it is possible to avoid problems such as variations due to skipped reading. A large pulse width can be taken to count a predetermined time.
It can be performed more accurately and stably. In addition, claim 4
Then, the paper discharge sensor immediately detects the rear end of the paper,
Even when the ON instruction is issued to the return roller, the paper is arranged at a position where the return roller can align the sheet, so that even if the conveyance of the paper is delayed due to a mechanical or circuit operation error. The error can be sufficiently absorbed, and the vertical alignment of the sheets can be performed well.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing a configuration and an operation of a sheet aligning mechanism.

FIG. 3 is a configuration diagram showing an arrangement of each member near a return roller.

FIG. 4 is a perspective view showing the configuration and operation of a stapling apparatus.

FIG. 5 is a block diagram showing a circuit configuration of a microcomputer incorporated in the device of the present invention.

FIG. 6 is a characteristic diagram showing a relationship between the number of stored sheets and a pulse count.

FIG. 7 is a flowchart showing control processing of a return roller.

FIG. 8 is a flowchart showing a determination process of the number of sheets and a pulse count.

FIG. 9 is a flowchart showing a control process of a return solenoid.

FIG. 10 is an explanatory diagram showing the operation of the first sheet of the conventional return roller.

FIG. 11 is an explanatory diagram showing the operation of the 50th sheet of the conventional return roller.

[Explanation of symbols]

 5 Return Roller 9 Jogger Fence 11 Staple Device 19 Rear End Fence 37 Paper Ejection Sensor 70 Alignment Control Means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location G03G 15/00 530 534

Claims (4)

[Claims] 1. A jogger fence for laterally aligning discharged sheet bundles, a trailing edge fence for vertical reference, a return roller for vertical alignment, and a stapling device for binding aligned sheet bundles. And a paper ejection sensor for detecting the rear end of the paper fed to the paper alignment mechanism. The operation timing of the alignment of the paper bundle is controlled by the paper ejection sensor. The sheet post-processing apparatus for each sheet according to, is provided with alignment control means for controlling the return roller to start operating after a lapse of a predetermined time after the sheet ejection sensor detects the sheet rear end. Characteristic paper post-processing device. 2. The alignment control means controls the predetermined time so as to increase as the number of sheets stacked in the sheet alignment mechanism increases.
The sheet post-processing device described. 3. The alignment control means controls to extend the predetermined time stepwise every time the number of sheets stacked in the sheet alignment mechanism reaches a predetermined number. 2. The sheet post-processing device described in 2. 4. The paper discharge sensor, immediately after detecting the trailing edge of the paper, outputs an ON command to the return roller,
The sheet post-processing apparatus according to claim 1, wherein the sheet is arranged at a position where the sheet can be aligned with the return roller.