JPH05155174A - Paper post-treatment apparatus - Google Patents

Abstract

PURPOSE:To reduce operation noise by controlling the driving speed operating a fence. CONSTITUTION:A paper post-treatment apparatus has the bin fence 460 provided on the lateral side of the papers placed on a tray and movable between a first stop position prescribing one side surfaces of papers and a second stop position releasing the papers to a stapler, the fence motor operating the bin fence 460 and a shaking shaft 502 arranging the papers. The bin fence 460 is controlled by full power when it is moved from the first stop position to the second position and the moving speed thereof is suppressed when the fence is moved in the reverse direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a copying machine, a facsimile machine,
The present invention relates to a sheet post-processing apparatus mounted on an image forming apparatus such as a printer, and is particularly characterized by a movement control of a fence for aligning sheets discharged onto a tray represented by a sorter bin with a sheet aligning member. The present invention relates to a sheet post-processing device.

[0002]

2. Description of the Related Art Various sheet post-processing devices that receive image-formed sheets discharged from image forming apparatuses such as copiers, facsimiles and printers and perform post-processing such as sorting, stacking, stapling, punching and stamping. Proposed. In such a sheet post-processing device,
After aligning the sheet bundle discharged to the bin of the sorter, the sheet bundle is moved to the stapler device side by a predetermined amount, and the stapler device performs stapling processing or the like. Here, as the sheet aligning mechanism, a sheet aligning member that is movable in the width direction of the sheet is used to regulate the sheet in the width direction by abutting the sheet against a fence provided on the side facing the sheet aligning member. What is done is common. Further, in such a mechanism, the stapler device is provided on the side on which the moving paper is abutted, that is, on the fence side, but the paper abutted on the fence is smoothly transferred to the chuck portion of the stapler device. There is a technique in which the fence is moved (rotated) to a position where it does not hinder the grip. That is, the fence is moved between a first stop position where the sheets are abutted and aligned, and a second stop position where the sheets are opened to the stapler device side.

[0003]

In the above prior art, when operating the fence with the motor, the control is performed with full power. However, when the fence is operated from the second stop position to the first stop position. However, when operated at full power, there is a problem that the fence comes into contact with the bin, and a considerable amount of noise is generated around the drive device and due to the drive device itself. Originally, it is not necessary to operate the fence from the second stop position to the first stop position after the stapling operation is completed. Therefore, it is not necessary to operate the fence at a high speed. It is desirable to control. The present invention has been made on the basis of such a background. The operation noise is reduced by controlling the driving speed for operating the fence, and the PWM (pulse width modulation) method is used as the control method. Therefore, the purpose is to reduce the cost.

[0004]

The above object is to provide a tray such as a bin of a sorter for sequentially stacking sheets discharged from an image forming apparatus, and a sheet provided on the side of the sheets stacked on the tray. Between a fence that is movable between a first stop position that regulates the side surface and a second stop position that opens the paper to the stapler device, a speed controllable drive unit that operates this fence, and the fence. In a sheet post-processing apparatus having a sheet aligning member for sandwiching sheets and aligning the sheets, when the fence is moved from the first stop position to the second stop position by the driving means, This is achieved by providing speed control means that is controlled by power and that controls the movement speed when the fence moves from the second stop position to the first stop position. In this case, in terms of cost, it is desirable to control the driving of the stepping motor by pulse width modulation.

[0005]

The stepping motor is drive-controlled by, for example, the PWM system to suppress the moving speed when the fence moves from the second stop position to the first stop position.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing an embodiment of a sheet post-processing apparatus. Inlet guide plates 101 and 102 are provided at an inlet A of a copy sheet ejected from a copying machine which is a main body of the apparatus.
Following the entrance guide plates 101 and 102, a switching claw 103 is provided for selecting a conveyance path for copy paper. The path above the switching claw 103 includes the inlet guide plate 101, the guide plates 110 and 114, the conveyance roller 108, the driven roller 109,
The discharge roller 111, the driven roller 115, and the proof tray 116 are connected to the upper conveyance section 100, and the path below the switching claw 103 is a slanted section guide plate 20.
5, inclined portion driven guide plate 217, lower conveyance portion guide plate 30
8, driven guide plates 309, 310, oblique portion receiving roller 20
1, oblique roller 202, oblique discharge roller 203, driven rollers 214 and 216, ball 215, conveyance rollers 301 and 302,
The inclined portion 200 passes through the driven rollers 305 and 306 and follows the path of the deflecting portion B. Each bin 35 of the deflection unit B path
A deflection claw 312 and a deflection portion discharge roller 304 are provided at positions corresponding to 0, respectively.
The driven roller 307 is pressed against the copy vertical feed path. The transport roller 108 and the discharge roller 111 are driven by a proof motor 117, and the inclined portion receiving roller 20
1, the inclined roller 202, the inclined portion discharge roller 203, the conveyance rollers 301 and 302, and the deflection portion discharge roller 304 are driven by a sorter motor 313.

FIG. 2 is a plan view of this embodiment shown in FIG.
Behind the group of bins 350, a stapler 701, which is a stapling means described later, a device (checking unit) 615 for bringing copy paper to the stapler 701, and a vertical movement mechanism for moving the stapler 701 and the checking unit 615 to each bin 350. A stapler device (binding device) 700 configured by is arranged. Further, on a side of the group of bins 350 on the opposite side where the stapler device 700 is arranged, a swing shaft 502, which will be described later, which serves as an aligning unit for aligning copy sheets before stapling, and this swing shaft 502 part is copied. An oscillating device 500 including a device for moving the paper to a place suitable for the size of paper is arranged. The sorter of this embodiment is a 20-bin sorter as shown in FIG. 1, and bin sensors 321 and 323 and paper discharge sensors 322 and 324 are provided at the top and bottom, respectively. These sensors 321, 32
Reference numerals 3, 322 and 324 are transmissive optical detection sensors including LEDs and phototransistors. The paper discharge sensor 32 operates to detect whether the copy paper has been discharged.
2, 324, and whether to perform an operation to determine whether or not copy paper is present in the bin 350. Bin sensor 321,
323. The copy paper ejected from the copier body is
It is guided by the guide plates 101 and 102 and conveyed to the switching claw 103. The switching claw 103 operates so that the copy paper is fed to the oblique portion 200 provided below the upper transport unit 100 when the solenoid is off, and is fed into the upper transport unit 100 when the solenoid is on. When the solenoid is turned on, the switching claw 103 is activated, and the copy paper guided in the upper transport unit 100 is transported by the transport roller 108 and the driven roller 10.
The sheet is ejected to the proof tray 116 by the conveying device configured by combining 9 items. Next, in the bin 350 usage mode such as sorting or stacking, the bin is guided by the switching claw 103 and fed to the oblique portion receiving roller 201 below.

When the copy paper discharged from the main body of the copying machine is the central reference, the unit for changing to the front end surface reference in the conveying path is the inclined portion 200. Oblique part 200
The copy paper sent out from the lower conveyance guide plate 3 in FIG.
08 and driven guide plates 309 and 310,
Transport rollers 301, 302 and driven rollers 305, 30
It is sent to the deflection unit B at 6. The deflection unit B includes a deflection unit discharge roller 304, a driven roller 307, a driven guide plate 311 and
The deflecting claws 312 are configured so that each deflecting claw 312 can be individually actuated by a solenoid. The deflecting claw 312 is opened and closed by a solenoid according to the designated mode condition to guide the copy sheets to the bins 350 and stack them.

FIG. 3 is a perspective view showing the outline of the rocking device 500, FIG. 4 is a plan view showing the relationship between the rocking device 500 and the bin 350, and FIG. 5 is a side view of the rocking device 500. A bin fence 460 is erected on one side edge of 350, and a bin rear end rising portion 508 is erected on the other side edge which is orthogonal to the edge where the bin fence 460 is provided. .. In addition, the binfuence 460
At the edge opposite to the edge where the
Is provided. In the elongated hole portion 511, as shown in FIG. 4, the distance a from the bottle rear end rising portion 508 is the distance b from the bottle rear end rising portion 508 to the bin fluence 460.
Further, it is provided so as to extend toward the bin fluence 460 for a predetermined length between the width c of the bin fluence 460. In addition, in FIGS. 3 to 5, the swing shaft 502 is erected so as to vertically penetrate through the elongated holes 511 provided in the bottles 350.
The swing shaft 502 is for abutting against the end face of the sheet bundle to align the positions. Further, the upper end and the lower end of the swing shaft 502 are attached to the holder 50 as shown in FIGS.
4a, 504b are placed in the recesses, and the bottle 35
Timing belts 507a and 507b extending substantially in the same direction as the extending direction are arranged in the upper region and the lower region of 0, respectively. The holder 504 is inserted into the recesses of the timing belts 507a and 507b.
The convex portions of a and 504b are inserted and fixed. Of the pulleys 509, 510 and 512 on which the timing belts 507a and 507b are respectively hung, the pulleys 509 and 512 are fixed to both ends of a drive shaft 514 which is provided so as to extend in the vertical direction. There is. The lower timing belt 507b is wound around a pulley 512 provided on the output shaft of the size moving motor 515. The movement of the swing shaft 502 depending on the size is controlled by the number of pulses given to the size moving motor 515.

Size moving motor 5 for a certain paper size
The oscillating shaft 502 is stopped by a position 15 at a certain distance from the ejected copy paper (10 in this embodiment).
mm). After the discharge is completed, the copy paper is raised at the rear end 5 of the bin.
The swing shaft 502 is moved to the copy paper side at the same time when it falls to 08, and is controlled by a pulse so as to have a certain biting amount (5 mm in this embodiment) from the end surface of the copy paper. When the swing shaft 502 finishes pushing the copy paper and then returns, after temporarily stopping the copy paper size width and then returning it to a fixed position, or by changing the moving speed of the swing shaft 502 By the waist of the paper
Prevent it from leaving 0 again. The copy sheet bundle is pressed against the bin fence 460 side by the swing shaft 502, and as a result, the one side end surface portion of the copy sheet bundle is aligned. The copy paper is abutted against the bin rising portion 508 which is orthogonal to the bin-fence 460 for aligning the other end face portion,
A method of dropping the copy paper by using the inclination of the bin 350 is used as one means for aligning. The copy sheet bundle, which has been aligned as described above, is taken out in the direction of arrow x in FIG. 4 after various post-processing such as a stapling operation described later is executed. Since there is no obstacle to the takeout in this takeout direction, the copy paper takeout operation can be easily performed. 503a, 503
Reference numeral b is a spring that supports the swing shaft 502.

Next, the stapler device 700 will be described. FIG. 6 is a perspective view of the stapler device 700, and the bins 350 for stacking copy paper are provided in multiple stages.
A stapler device 700 is disposed on the side of the. In this stapler device 700, a stapler 701
And the sheet pulling device (checking unit) 615,
It is attached to the upper part of the plate-shaped bracket 703 and is fixed to each. The stapler 701 is for stapling each of the finished copy paper bundles accumulated on each bin (not shown), and the paper drawing device 615 grips the copy paper bundle on each bin. , Which is transferred almost horizontally. Drive motor 72
The drive belt 717 is conveyed and driven by 0 and the driving force transmission mechanism, whereby the stapler 701 and the sheet pulling device 615 are vertically moved.

FIG. 7 is an explanatory view for making the movement of the stapler device 700 easy to understand, and the movement of the copy paper P and the check portion 620 discharged onto the bin 350 and the position of the stapler 701 will be described. The copy paper P discharged onto the bin 350 is discharged to a position as indicated by 730d. Then, using the above-described rocking device, the binfence 460
Is provided at a position where it abuts against. After that, when the stapling operation is started, the chuck section 620 moves to the position 6 of the alternate long and short dash line.
20b to another position 620c indicated by the alternate long and short dash line, the chuck section 620 is closed to sandwich the copy paper P, and the position 6 indicated by the solid line is indicated.
Stop at 20a. By this operation, the copy paper P is 73
Move to the 0f position, and use the stapler 701 to
On the sheet 50, a certain number of copy sheets P are stapled.
After that, the reverse operation is performed, and the copy paper P is returned to the position of 730d. This completes the work for one bin 350, goes to the next bin 350, and repeats this operation.

FIG. 8 is a front view of the sheet pulling device 615. A chuck portion 620 for holding the copy sheet bundle P on the bin 350 and a reciprocating mechanism 640 for reciprocating the chuck portion 620 in a substantially horizontal direction. It has and. In the chuck portion 620, a pair of swing lever upper 622 and swing lever lower 624 are swingably attached to the substrate 621. The swing lever upper 622 and the swing lever lower 624 are connected to the solenoid 626. The upper chuck 623 and the lower chuck 625 are operated so as to hold the copy sheet bundle P by being operated by. Reciprocating mechanism 6
40 includes a frame 641 and a shaft 64 for sliding the chuck portion.
2 is fixed, and a bearing 629 fixed to the substrate 621 is engaged with the shaft 642, and guided by the shaft 642, the chuck portion 620 reciprocates. Further, the frame body 641 is provided with a timing belt 643 for advancing / retreating the chuck portion 620 toward the copy sheet bundle P side. The chuck portion 620 and the timing belt 643 are fixed by the arm portion 621a of the substrate 621. Both ends of the timing belt 643 are stretched around pulleys 644 and 645, and one pulley 644 is attached to a stepping motor 646. By driving the stepping motor 646, the pulley 644 rotates and the timing belt 643 moves. Timing belt 643
By this movement, the chuck portion 620 fixed to the timing belt 643 is reciprocated via the arm portion 621a. The frame 641 has a position sensor 6
50 is installed, and a detection plate 630 is erected on the substrate 621 as a detection target. The position sensor 650 detects the home position of the chuck portion 620.

In an embodiment having such a structure,
When the staple mode is started, first, the stapler 701 and the paper pulling device 615 are integrally moved up and down by the drive belt 717 shown in FIG. 6, and as shown in FIG. 8, the stapler 701 and the paper pulling device are moved. 615 is transferred to a predetermined bin 350 for accumulating a copy sheet stack P to be stapled, and the position sensor 72 of FIG.
It is stopped at a position close to a predetermined bin 350 based on the signal from 7. At this time, the solenoid 626 is off, and accordingly, both the swing levers 622 and 624 and the chucks 623 and 625 are placed in the open state. In addition to the above operation, the fence motor 462 is turned on to open the bin fence 460. Next, the stepping motor 646 rotates by a predetermined amount to move the timing belt 643 to move the chuck section 620 toward the copy sheet bundle. By changing the rotation speed of the stepping motor 646, speed control during movement of the chuck portion 620 is performed. In the case of the present embodiment, the stack 620 holds the aligned copy sheet bundles by the chucks 623 and 625, and gradually accelerates at the start when returning to the staple position, and gradually decelerates at the time of stop, thereby aligning the sheets. This prevents the used copy paper from varying due to inertia during acceleration / deceleration. When moving the same distance within the same time, the maximum value of the inertial force is the smallest in the uniform acceleration motion. Therefore, in this embodiment, the acceleration / deceleration is performed at the uniform acceleration.

When the chucks 623 and 625 move to a position where the bundle of copy sheets can be held, they stop there and at the same time the solenoid 626 is turned on. Solenoid 6
When the switch 26 is turned on, the chucks 623 and 625 are closed, and the edges of the bundle of copy sheets are gripped by the chucks 623 and 625. If only one corner of the copy paper is held by the chucks 623 and 625, a moment is applied to the copy paper P due to the inertia when the paper is drawn, and the copy paper P is
Is skewed on the bin 350, and there is a problem that the staple position varies. Therefore, the copy paper P is held at a plurality of positions so that the copy paper does not skew even when a moment due to inertia is applied. Next, the stepping motor 64
The reverse rotation of 6 causes the chuck unit 620 to return to the original position while holding the copy sheet bundle, whereby the copy sheet bundle is moved in parallel in the substantially horizontal direction and is drawn to the stapler 701 side. When the edge portion of the copy sheet bundle is transported to a position where stapling is possible, it stops there. After that, the stapler 701 performs staple driving on the edge portion of the copy sheet bundle. When the stapling operation ends, the stepping motor 646 rotates in the normal direction, the chuck section 620 moves forward, the stapled copy paper P is returned onto the bin 350, and then the solenoid 626 is turned off. As a result, the top 62 that was closed until now
3 and the lower check 625 will open. After that, the stepping motor 646 is rotated in the reverse direction again to check the chuck portion 62.
0 moves backward to a predetermined position. Then stapler 70
1 and the sheet pulling device 615 are moved downward to the next bin 350, where the stapling operation similar to the above-described operation is repeatedly executed. When the stapling is performed on all the bundles of copy paper, the stapler 701 is raised and returned to the highest home position.

FIG. 9 is a perspective view showing the bin fence 460 of the embodiment. In the figure, the bin fence 460 is pressed against each bin 350 so that all the bins 350 can be aligned by a single plate. The fence 460 is rotatably attached at upper and lower rotation fulcrums 460a and 460b. The rotation fulcrum 460b has a gear 460c, and a gear 461 is meshed with the gear 460c,
The gear 461 is driven by the drive motor 462. When the copy sheets are aligned, the fence 460 faces the bin 350 to align the sheets as shown in FIG. When all sorts are completed and stapling is performed, the bin fence 460 is rotated about 90 ° so that it can be separated from the bin 350 and the copy sheet P can be moved to the stapling position.

FIG. 10 is a block diagram of the control system in the present embodiment. This control system is a CPU 800 which is a control means.
Mainly ROM 801, RAM 802, 1 / O port 8
03,806, a clock timer controller 804 (hereinafter abbreviated as CTC), and a universal asynchronous receiver transceiver 805 (hereinafter abbreviated as UART).
A ROM 801 in which a program has been written allows a RAM at any time
Sensor switch (SW) described later while using 802
The signal from the group is received via the I / O port 806,
The output of O port 803 and CTC 804 enables SSR8
07, various drivers 808, 809, 810, 811
Each load to be described later is controlled via 812 and the phase signal generation unit 813. Further, it is connected to a copying machine by an optical fiber (not shown) by a UART 805 via a receiver 814 and a driver 815, and exchanges each status and instruction signal. Among the signals exchanged with the copying machine, the signals sent from the copying machine to the sorter stapler device 700 include a sorter start signal, a copy machine discharge signal, a staple start signal, a staple end signal, a system reset signal, and a service. Call reset signal (SC reset),
There are a status request signal, a mode signal, a size signal, a discharge bin instruction signal, and the like. The signals sent from the stapler device 700 to the copying machine include a model recognition signal, a tray paper presence signal,
There are a stackover signal, a binover signal, a cover open signal, a stapleless signal, a JAM signal, a stapling impossible signal, a paper discharge signal, a WAIT signal, a BUSY signal, a mode end signal, a staple count signal, an abnormal signal and the like.

11 and 12 are flow charts of the entire operation of this embodiment. First, the mode signal sent from the copying machine is received (step 1-1), and after the copying is started, the size signal is received ( Step 1-2), and then the sorter start signal is received (step 1-3). Upon receipt of this signal, the mode signal turns on the sorter motor (during sorting or stacking) or the proof motor (during proofing or interruption). First, the proof mode (steps 1-4) will be described. Turning on the proof motor 117 of FIG. 1 (step 1-
After 5), the switching SOL is turned on (step 1-6),
When the paper discharge signal is received (step 1-7), the copy paper carried in from the entrance guide 102 (step 1-8) is discharged to the upper proof tray 116. After the copy paper is discharged (step 1-9), a paper discharge signal is transmitted to the copying machine (step 1-10) to notify that the carried-in copy paper is completely discharged. Thereafter, this operation is repeated until the copy is completed (step 1-11). At this time, the detection of the jam of the copy paper (not described in the flow chart) is naturally performed. After the copying is completed, the switching SOL and the proof motor 117 are turned off (step 1-12), and the operation stands by until the next copying operation.

Next, the sort and stack modes will be described. After the sorter motor 313 of FIG. 1 is turned on (step 1-13), it is determined whether or not swinging is possible by a size signal or the like, and if swinging is possible (step 1-14), the position corresponding to the received size signal. The swing shaft 502 of FIG. 3 is moved to (step 1-15). Next, when the copy paper is ejected from the copying machine, the ejection destination bin instruction signal and the ejection signal of the ejected copy paper are transmitted from the copying machine (step 1-16). The bin 350 of the ejection destination is determined by receiving the ejection signal (step 1-17). Next, copy paper is carried in from the copying machine (step 1-1).
8). After the carry-in, the entrance sensor is turned on, and at the timing when the entrance sensor is turned on, the deflection solenoid (SOL) determined by the discharge destination bin instruction signal is turned on (step 1-19), and the copy paper is transferred to the bin 350. And lead. When the copy paper is ejected (step 1-20), a paper ejection signal is transmitted to the copying machine (step 1-21) to inform the copying machine that the paper has been reliably ejected onto the bin 350. Based on this signal, the copier determines the next discharge destination and the discharge destination after recovering the jam. Bin 350 with copy paper ejected
After an appropriate time has elapsed until the operation of the copy paper settles down (for example, after 300 ms; step 1-22), the size moving motor 515 of FIG.
By moving (step 1-23), the paper is aligned in the direction (horizontal direction) perpendicular to the discharge direction. The swing shaft 5
The timing of moving 02 is detected with the paper discharge sensors 322 and 324 at the trailing edge of the copy paper, and is based on that (step 1-24).

The above operation is performed every time a copy is discharged, and sorting is performed. When the sorting is completed in this way (step 1-25), the sorter motor 313 is turned off (step 1-26), and the stapling operation is performed. When the staple start signal is received (step 1-27), the stapler device 700 is operated (step 1-28), and the stacked copy sheets are stapled. At this time, the fence motor 462 is turned on to open the bin fence 460 so that the copy sheet P can be moved to the stapling position. At this time, the fence motor motor 462 is driven at maximum speed with full power in order to increase system productivity. Upon completion of stapling, the stapler device 700 and the swing shaft 502 move to the home position (step 1-30). Also, turn on the fence motor 462,
The bin fence 460 is closed to a position facing the bin 350. At this time, the speed of the fence motor 462 is controlled by the PWM method in order to reduce noise and suppress the generation of noise, and is driven at a speed slower than when the bin fence 460 is opened. The home movement of the stapler device 700, the movement of the swing shaft 502, and the movement of the bin fence 460 may be performed simultaneously or in a different order from the present embodiment.

FIG. 13 is a flow chart of the above-described bin-fence movement (rotation in the embodiment) control, which moves the bin-fence 460 from the first stop position to the first position while the fence motor 462 is operating (step 2-1). 2 is rotating to the stop position, in other words, is open, or is rotating from the second stop position to the first stop position, in other words, is closing (step 2-2), If it is open, the Fence motor 462 is turned on with full power (step 2-3), and if it is closed, PWM control is performed to suppress the rotation speed of the fence motor 462 (step 2-4), and the bin fence 460 is set. It is gently rotated and brought into contact with the side surface of the bottle 350 gently.

[0022]

According to the first aspect of the invention, since the movement speed is suppressed when the fence (bin fence) is returned to the first stop position which is the sheet regulation position, the noise accompanying the return operation is reduced. Can be planned. According to the second aspect of the present invention, by performing PWM control of the motor that drives the fence (fence motor), it is possible to omit the dedicated control circuit and reduce the cost.

[Brief description of drawings]

FIG. 1 is a front view of a sheet post-processing apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of the sheet post-processing device.

FIG. 3 is a perspective view showing an outline of a rocking device.

FIG. 4 is a plan view showing the relationship between the rocking device and the bottle.

FIG. 5 is a side view of the rocking device.

FIG. 6 is a perspective view of a stapler device.

FIG. 7 is an explanatory diagram showing the movement of the stapler device.

FIG. 8 is a front view of the sheet drawing device.

FIG. 9 is a perspective view of a bin fence.

FIG. 10 is a block diagram of a control system of the entire apparatus.

FIG. 11 is a flowchart of the entire operation.

FIG. 12 is a flowchart of the entire operation.

FIG. 13 is a flow chart of the movement control of the binfuence.

[Explanation of symbols]

 460 Bin Fence 462 Fence Motor 502 Swing Axis (Paper Alignment Means) 700 Stapler Device 800 CPU (Speed Control Means)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B65H 39/11 J 9037-3F

Claims (2)

[Claims] 1. A tray such as a bin of a sorter for sequentially stacking sheets ejected from an image forming apparatus, and a first stop provided on the side of the sheets stacked on the tray to regulate one side surface of the sheets. A fence that can move between a position and a second stop position that opens the paper to the stapler device, a drive unit that can control the speed to operate the fence, and the paper can be sandwiched between the fence and the paper. In a sheet post-processing apparatus having a sheet aligning member for aligning, when the motive force is moved from the first stop position to the second stop position by the driving means, it is controlled with full power, A sheet post-processing apparatus comprising: speed control means for controlling the moving speed when the sheet moves from the second stop position to the first stop position. 2. The sheet post-processing apparatus according to claim 1, wherein the speed control means performs drive control of a motor that is drive means by pulse width modulation.