JP2003300662A - Sheet processing apparatus and image forming apparatus therewith - Google Patents

Sheet processing apparatus and image forming apparatus therewith

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Publication number
JP2003300662A
JP2003300662A JP2002105849A JP2002105849A JP2003300662A JP 2003300662 A JP2003300662 A JP 2003300662A JP 2002105849 A JP2002105849 A JP 2002105849A JP 2002105849 A JP2002105849 A JP 2002105849A JP 2003300662 A JP2003300662 A JP 2003300662A
Authority
JP
Japan
Prior art keywords
sheet
rotating
holding
pair
image forming
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2002105849A
Other languages
Japanese (ja)
Inventor
Tomoyuki Watabe
知幸 渡部
Original Assignee
Canon Finetech Inc
キヤノンファインテック株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Canon Finetech Inc, キヤノンファインテック株式会社 filed Critical Canon Finetech Inc
Priority to JP2002105849A priority Critical patent/JP2003300662A/en
Publication of JP2003300662A publication Critical patent/JP2003300662A/en
Withdrawn legal-status Critical Current

Links

Abstract

[PROBLEMS] To provide a sheet processing apparatus and an image forming apparatus provided with the same, which can prevent disturbance of consistency at the time of discharging a sheet and decrease in productivity. A rotating body pair (17a, 17) for discharging a sheet is provided.
The holding member 20 holding one of the rotating bodies 17b moves the one rotating body 17b to a position where the sheet is sandwiched together with the other rotating body 17a and a position where the sheet is separated from the other rotating body 17a. Further, a first position where the holding member 20 is moved to a position where the holding member 20 moves the one rotating body 17b away from the other rotating body 17a, and a sheet is held between the one rotating body 17b and the other rotating body 17a. Moving means 46 movable to a second position to be moved to a position
To move. Then, the second position of the moving means 46 is changed in accordance with the number of sheets to be held, and the moving means 4 is moved.
By changing the elastic force of the elastic member 110 connecting the holding member 20 and the holding member 20, the sheet holding pressure of the rotating body pair 17a, 17b is adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet processing apparatus and an image forming apparatus equipped with the same, and more particularly to a structure of a pair of rotating bodies for discharging a processed sheet bundle to a discharged sheet stacking section.

[0002]

2. Description of the Related Art Conventionally, in an image forming apparatus such as a copying machine, a printer, a facsimile and a combination of these devices, the sheets discharged from the image forming apparatus main body are aligned and classified. There is provided a sheet processing device for selectively performing processing such as sorting processing, binding processing for selectively binding a bundle of a plurality of sheets, stack processing for stacking and accommodating sheets or sheet bundles.

Here, in such a sheet processing apparatus,
The sheet bundle that has been selectively processed is discharged and stacked on the discharged sheet stacking unit. At this time, the sheet conveying force by the discharging unit is a constant force (pressing force). Are to be transported.

[0004]

However, in such a conventional sheet processing apparatus, since the conveying force of the discharging means is constant, the conveying force of the discharging means does not correspond to the conveying force of the discharging means when a large number of sheet bundles are discharged. Since the conveyance resistance due to the weight counteracts, if the sheet bundle is discharged at a high speed, a bundle conveyance failure may be caused at the time of acceleration of start-up of the discharging means. Therefore, as a countermeasure, the bundle conveying speed is slowed down, but if the bundle conveying speed is slowed down in this way, the productivity is lowered.

Further, when the conveying force of the discharging means is constant,
The force for pinching the sheet bundle is also constant, and in this case, the alignment is disturbed at the time of discharging the sheet depending on the number of sheets in the sheet bundle or the sheet size of the sheet bundle.

The sheet bundle can be stably discharged by increasing the conveying force of the discharging means. However, in this case, the driving motor of the discharging means becomes large, the power consumption increases, and the structure of the entire apparatus is increased. Will become bigger.

Therefore, the present invention has been made in view of such a situation as described above, and a sheet processing apparatus and an image including the sheet processing apparatus capable of preventing the disturbance of the alignment and the reduction of the productivity at the time of discharging the sheet. An object is to provide a forming apparatus.

[0008]

SUMMARY OF THE INVENTION According to the present invention, in a sheet processing apparatus that stacks an image-formed sheet on a sheet stacking unit and then processes the sheet while sandwiching the processed sheet. A rotating body pair that rotates and discharges the sheet to the discharged sheet stacking unit and one rotating body of the rotating body pair is rotatably held, and the one rotating body is included in the rotating body pair. A holding member movable to a position for sandwiching the sheet with the other rotating body and a position for separating the sheet from the other rotating body; and a position for separating the holding member from the one rotating body from the other rotating body. The moving means and the holding member, the moving means being movable to a first position for moving the first rotating body to a second position for moving the one rotating body together with the other rotating body to a position for sandwiching the sheet. An elastic member, Clamping pressure adjusting means for changing the second position of the moving means to change the elastic force of the elastic member acting between the moving means and the holding member to adjust the sheet clamping pressure of the rotating body pair, It is characterized by having.

In the present invention, the holding pressure adjusting means may be the second moving means according to the number of the held sheets.
It is characterized by changing the position.

Further, the present invention is characterized in that the holding pressure adjusting means changes the second position of the moving means according to the size of the held sheet.

Further, the present invention is characterized by comprising drive means for rotating the other rotary body, and increasing the drive current of the drive means as the sheet clamping pressure of the rotary body pair increases. It is a thing.

Further, the present invention is an image forming apparatus comprising an image forming section and a sheet processing apparatus for processing a sheet on which an image has been formed by the image forming section, wherein the sheet processing apparatus is one of the above. It is characterized in that it is described in.

According to the present invention, in an image forming apparatus, an image forming section, a sheet stacking section for stacking sheets on which an image has been formed by the image forming section, and a sheet stacked on the sheet stacking section are sandwiched. While rotating while rotating the pair of rotating bodies that discharges the sheet to the discharged sheet stacking unit, and rotatably holding one rotating body of the pair of rotating bodies, A holding member movable to a position for sandwiching the sheet together with the other rotating body and a position for separating the sheet from the other rotating body, and the holding member for separating the one rotating body from the other rotating body. A moving position movable to a first position for moving the rotating member to a position and a second position for moving the one rotating member to a position for holding the sheet together with the other rotating member, and the moving member and the holding member are connected to each other. Elastic member Clamping force adjusting means for varying the second position of the moving means to change the elastic force of the elastic member acting between the moving means and the holding member, and adjusting the sheet clamping pressure of the rotating body pair. , Is provided.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram for explaining the configuration of a copying machine which is an example of a sheet processing apparatus and an image forming apparatus including the sheet processing apparatus according to an embodiment of the present invention. It is configured by connecting the device B.

Here, the copying machine optically reads a document (not shown) automatically fed from the document feeding device 1 mounted on the upper part of the apparatus by the reader unit 2, and thereafter forms an image by using this information as a digital signal. Send to section 3 to send plain paper or OHP
An image is formed on a sheet such as a sheet.

A plurality of sheet cassettes 4 accommodating sheets of various sizes (not shown) are attached to the lower portion of the copying machine main body A, and images are formed on the sheets conveyed by the conveying rollers 5 from the sheet cassettes 4. An image is formed in the section 3 by an electrophotographic method.

That is, based on the information read by the reader unit 2, the exposure control unit 3a of the image forming unit 3 irradiates the photosensitive drum 3b with laser light to form a latent image, and develops this latent image with toner. To form a toner image on the photosensitive drum. Then, after this, the toner image is transferred to a sheet, which is conveyed to the fixing unit 6 and permanently fixed by applying heat and pressure.

Then, this sheet is sent to the sheet processing apparatus B in the case of the single-sided recording mode, and is conveyed to the resending path 7 by switchback in the case of the double-sided recording mode. Then, the image is formed on the other surface by being conveyed to the sheet 3 and then sent to the sheet processing apparatus B. The sheets can be fed not only from the sheet cassette 4 but also from the multi-tray 8.

On the other hand, the sheet processing apparatus B is a copying machine main body A.
The finisher unit C is capable of sorting the sheets on which the images are formed according to the number of copies, and the stitcher unit D capable of binding and folding a plurality of sheets.

Here, when the sheet is discharged, the finisher unit C is adapted to perform a discharging process in accordance with each mode such as the offset mode and the staple mode in addition to the normal discharging mode.

In the stapling mode, when the sheets are sorted by the number of copies and ejected, the sheets are stacked and aligned on the staple tray 12, which is a sheet stacking unit, and the stapler 1 is used.
It is an operation mode in which the staple is stopped by 3, and the sheets are bound and discharged for each number of copies.

Further, in the offset mode, when the sheets are sorted and discharged for each number of copies, when the sheets are discharged for each number of copies, the side guide 11 shown in FIG.
Is an operation mode in which the sheet is discharged so that the boundaries of the respective parts can be seen by moving the sheet and shifting the sheet in the sheet width direction (direction orthogonal to the sheet conveying direction) by a predetermined amount.

Next, such a finisher unit C
The operation of will be described in detail.

In the normal mode, the sheet P discharged from the main body A of the copying machine is conveyed by the conveying roller 15 shown in FIG. 2, and then is conveyed by the upstream discharging roller pair 16a, 16b and the downstream discharging roller pair 17a, 17b. , And is discharged to the stack tray 18 which is the discharged sheet stacking unit shown in FIG.

A plurality of stack trays 18 are provided so as to be movable in the vertical direction, and are moved in the vertical direction by a drive source (not shown) built in the lower part thereof. In the case of sort discharge, the plurality of stack trays 18 are sequentially moved to the discharge port 36 so that the sheets P can be discharged in a state of being sorted by the number of copies.

In the case of the offset mode and the staple mode, it is possible to perform the offset process or the staple process on one stack tray 18 and discharge it in the sorted state. Further, in the interrupt mode, it is also possible to discharge to the upper tray 19 without discharging to the stack tray 18.

Next, the offset mode will be described.

In the offset mode, as shown in FIG. 3, when all the copies are discharged to one stack tray 18 and when the copies are discharged in the unit of the number of copies, two sheets P1 of the first sheet of each copy are discharged. The sheet P after the eyes is shifted in the sheet width direction. This makes it possible to clarify the boundaries between the parts.

Here, in the present embodiment, as the sort processing in this offset mode, in addition to the control of shifting the first sheet of each part in the width direction, the entire sheet bundle is shifted in the sheet width direction. Thus, it is possible to select either of the bundle offset modes that clarify the boundary of each copy.

For this reason, the downstream discharge roller 17a provided in the unit main body B1 which constitutes the downstream discharge roller pair 17a, 17b which is a pair of rotating bodies, and the rotary shaft 20a shown in FIG. 5 with respect to the unit main body B1. As a holding member that can be swung about, for example, the moving discharge roller 17b attached to the swing guide 20 is configured to be separated as shown in the figure when the swing guide 20 is opened upward. There is.

Further, as shown in FIG. 4, between the upstream discharge roller pair 16a, 16b and the downstream discharge roller pair 17a, 17b, a side guide which is a matching means for pressing one side end of the sheet P in the width direction. 11 is configured to be movable in the seat width direction.

As a result, for example, when all the copies are discharged to one stack tray 18 and are discharged by the number of copies, the first sheet P1 of each copy to be sorted is discharged, and the rear end of the sheet is discharged upstream. When the swing guide 20 is opened upward as shown in FIG. 5 when it is conveyed between the roller pair 16a, 16b and the downstream discharge roller pair 17a, 17b and falls on the staple tray 12, the downstream discharge roller 17a is opened. And the movable discharge roller pair 17b are separated from each other. After that, when the side guide 11 is moved in the arrow direction shown in FIG. 4, the first sheet P1 moves by a predetermined amount.

Next, the swing guide 20 is closed and the sheet P1
Are discharged to the stack tray 18, and then the second and subsequent sheets P are normally discharged, so that as shown in FIG. 3 and FIG. Is discharged. If there is no space to move the sheet by a predetermined amount with respect to the size in the sheet width direction, the reference guide 37 is retracted below the staple tray 12 to secure a sufficient sheet movement amount.

On the other hand, when the bundle is offset, a plurality of sheets to be sorted by the above-described structure are stapled in the staple tray 12
When a plurality of sheets are accumulated, the side guide 11 is moved in the direction of the arrow shown in FIG. 4 to move the plurality of sheets by a predetermined amount. After that, this operation is repeated for the offset sheet bundle to clarify the boundary for each set bundle.

By the way, in the present embodiment, the finisher unit C has a multi-sheet ejection control capable of ejecting a large number of sheets at the same time, in addition to the normal ejection control for ejecting one sheet at a time of sheet ejection. Is possible. Here, this multi-sheet discharge control is performed by the copying machine main body A.
This is an operation control in which the sheets sent from the sheet processing apparatus B to the sheet processing apparatus B are retained in the buffer path 14 provided in the finisher unit C, and a large number of sheets are discharged at the same time so as to overlap the sheets to be discharged next.

Next, two-sheet ejection control will be described as an example of such multi-sheet ejection control. When the second sheet is conveyed from the copying machine main body A to the finisher unit C while the first sheet is being offset, the first flapper 21 and the second flapper 22 as shown in FIG. The upstream end of the sheet P2 is positioned downward, and the second sheet P2 is sent to the buffer path 14.

The preceding sheet (second sheet in the offset mode) P sent to the buffer path 14
2 is a buffer roller 23 that is driven to rotate and a buffer roller 24 that is driven to rotate by pressing the sheet P2 against the buffer roller 23,
It is sent in the direction of the arrow in the drawing in a form of being wrapped around the buffer roller 23. At this time, the third flapper 25 rotates so that the preceding sheet P2 is fed in the direction in which it is wrapped around the buffer roller 23.

Next, the buffer sensor 26 detects the leading edge of the preceding sheet P2, and when the leading edge of the preceding sheet P2 reaches a predetermined position, the driving of the buffer roller 23 is stopped and the preceding sheet P2 is placed in the buffer path 14. Stop. When the trailing sheet (third sheet in the offset mode) P3 enters in this state, the buffer roller 23 starts rotating. As a result, as shown in FIG. 6, the preceding sheet P2 and the succeeding sheet P3 are conveyed in an overlapping state.

Further, when the trailing edge of the preceding sheet P2 passes the position of the third flapper 25, the third flapper 25 rotates so as to feed two sheets P2 and P3 toward the upstream discharge roller pair 16. Then, as a result, the sheets P2 and P3 are discharged onto the stack tray 18 while the two sheets are overlapped.

By performing such a two-sheet discharge control operation, sheets are not discharged from the upstream discharge roller pair 16a and 16b during the offset processing operation, and therefore the copying machine main body A is used. There is no need to stop the operation of. Therefore, the processing time does not become long even in the offset mode, and quick offset discharge is possible.

Next, the staple mode will be described.

In the staple mode, the swing guide 20 is opened as shown in FIG. 5, and the upstream discharge roller pair 16a,
After the sheet P is discharged to the staple tray 12 by 16b, the sheet P is rotated in the arrow direction by the rotation of the paddle 31 provided on the swing guide 20 and the driving of the upstream lower discharge roller 16a.
As a result, the trailing edge of the sheet P is returned to the position where it abuts on the trailing edge stopper 33. Then, the side guide 11 pushes the sheet P to one side to align the sheet P, and then the swing guide 20
And the stapler 13 performs the stapling operation.

The holding position for opening the swing guide 20 is the sheet P discharged onto the staple tray 12.
You may comprise so that the contact area of the paddle 31 with respect to may be kept constant. More specifically, this can be achieved by changing the rotation stop position of the operating gear 46 by the drive mechanism described later according to the change in the height (level) of the sheet P on the sheet tray 12.

The swing guide 20 rotatably holds the movable discharge roller 17b, and when the sheet is discharged, it swings downward with a swing shaft 20a as a fulcrum by a drive mechanism described later as shown in FIG. While the movable discharge roller 17b is pressed against the downstream discharge roller 17a, it is swung upward by the drive mechanism with the swing shaft 20a as a fulcrum in the staple mode (however, it is closed when the staple operation is actually performed). The moving discharge roller 17b is moved to the downstream discharge roller 1
It is for separating from 7a. That is, the swing guide 20 includes the moving discharge roller 17b and the downstream discharge roller 1
7a serves as a switching unit that switches the sheet dischargeable state to the sheet dischargeable state.

In the figure, reference numeral 34 designates a shutter unit 3.
4a is a stopper, and the link 35 rotates upward with the rotation shaft 35a as a fulcrum when the stack tray moves,
By raising the shutter portion 34a formed at the end portion, when the stack tray 18 passes through the discharge port 36 by closing the discharge port 36, the sheets (or the sheet bundle) stacked on the stack tray 18 are The backflow to the discharge port 36 is prevented. When the sheet is discharged, the stopper 34 is configured such that the link 35 rotates downward about the rotation shaft 35a as a fulcrum to open the discharge port 36.

Next, the stapling operation will be described.

When performing the stapling operation, as described above, the bundle of sheets P stacked on the stack tray 18 and the staple tray 12 is the downstream discharge roller pair 17a, 1.
It is sandwiched by 7b and is bound by the stapler 13 in this state. Here, various combinations of this binding position (staple position) are conceivable, but in the present embodiment, it is possible to select a mode of binding one corner of a sheet and a mode of binding two sides of a sheet. .

On the other hand, when the binding process is completed, the downstream discharge roller pair 17a, 17b rotates in the conveying direction and discharges the bundle of sheets P to the stack tray 18.

As described above, in FIG. 8, when performing the stapling operation, for example, the swing guide 20 is vertically swung about the shaft 20a as a fulcrum, and the downstream discharge roller pair 17 is moved.
a and 17b, a position where the moving discharge roller 17b is separated from the downstream discharge roller 17a,
For example, a drive mechanism of the actuating gear 46 is shown as a moving unit that can move to a position where the sheet is nipped by being pressed against a. In the figure, reference numeral 39 denotes a drive mechanism, which includes a drive motor 40b, an operating gear 46 rotated by the drive motor 40b, and a swing guide 20.
When the operating gear 46 rotates,
The operating gear 46 is provided with an opening / closing arm 47 that engages with a protrusion 46b.

In the figure, 41 is the drive motor 4
The transmission gear train 41 transmits the rotation of 0b to the operating gear 46.
When is rotated in the clockwise direction, the operating gear 46 is rotated in the counterclockwise direction.

When the operating gear 46 rotates in the counterclockwise direction in this way, the projection 46b of the operating gear 46 rises accordingly, and the opening / closing arm 47 of the swing guide 20 moves.
When the drive motor 40b further rotates, the swing guide 20 pressed by the protrusion 46b via the opening / closing arm 47 rotates upward.

After that, when the drive motor 40b further rotates and the swing guide 20 reaches a predetermined position, the drive motor 40b is temporarily stopped, whereby the swing guide 2 is moved.
0 is held in an open state as shown in FIG.

On the other hand, after that, when the driving of the drive motor 40b is restarted, the projection 46 is rotated along with the rotation of the operating gear 46.
b is lowered, the swing guide 20 is also rotated downward by its own weight (or a biasing means (not shown)) accordingly, and eventually the movable discharge roller 17b held by the swing guide 20 is moved downstream as shown in FIG. It comes to stop while being pressed against the discharge roller 17a.

By the way, in the present embodiment, FIG.
As shown in FIG. 4, a locking portion 47a provided on the opening / closing arm 47
And a protrusion 46b of the operating gear 46, an oscillating pressure spring 110, which is an elastic member, is attached. The oscillating pressure spring 110 presses the moving discharge roller 17b against the downstream discharge roller 17a. Opening / closing arm 4 when closed
The rocking guide 20 is urged downward via the shaft 7. As a result, the moving discharge roller 17b held by the swing guide 20 comes into pressure contact with the downstream discharge roller 17a.

The biasing force of the rocking pressure spring 110 is different depending on the stop position of the operating gear 46, and the projection 46b of the operating gear 46 is at the position shown by the alternate long and short dash line in FIG. When the operation gear 46 is stopped, the force with which the moving discharge roller 17b is brought into pressure contact with the downstream discharge roller 17a is maximized. By controlling the stop position of the operation gear 46 in this way, the contact pressure of the downstream discharge roller pair 17a, 17b can be controlled.

On the other hand, in the figure, 40a is a drive means for driving the downstream discharge roller 17a in the forward and reverse directions, for example,
The drive motor is a drive motor, and the drive of the drive motor 40a is transmitted to the downstream discharge roller 17a via the belts 42a and 42b and the pulleys 42c and 42d.

Further, in the present embodiment, when the drive motor 40a rotates counterclockwise, the downstream discharge roller 1
7a rotates in the sheet discharging direction, and when the drive motor 40a rotates clockwise, the downstream discharging roller 17a rotates in the direction opposite to the sheet discharging direction. In the contact pressure control of the pair of downstream discharge rollers 17a and 17b, the current value of the drive motor 40a that drives the downstream discharge roller 17a is changed according to the magnitude of the contact pressure. ing.

In the figure, reference numerals 56a and 56b are encoders for detecting the rotational speeds of the drive motors 40a and 40b, 55a and 55b are drive motor rotation detection sensors for detecting the rotational speed of rollers, and 55c is the swing guide 20. Is a position detection sensor that detects the position of
The detection signals from 5a, 55b, 55c are input to, for example, the CPU of the control unit 50 as the clamping pressure adjusting means shown in FIG.

Then, the CPU of the control unit 50 controls the rotation of the drive motors 40a and 40b based on the detection signals from these sensors 55a, 55b and 55c to swing the swing guide 20 and the downstream discharge roller 17a. The rotation control and the contact pressure control of the downstream discharge roller pair 17a, 17b are performed.

FIG. 10 is a block diagram for explaining the contact pressure control of the above-described sheet processing apparatus B. The CPU of the control unit 50 internally stores a program corresponding to the operation description to be described later,
By executing it, the control in the sheet processing apparatus B and the copying machine A
Communicate with. The CPU of the control unit 50 includes a control unit 100 of the copying machine A and a drive motor rotation sensor 55 as shown in the figure.
a, drive motor rotation sensor 55b, position sensor 55c,
Connected to the drive motor 40a, the drive motor 40b, etc.,
Exchanges sensor information, control signals, etc. with the connected control unit, sensor, motor, etc.

Next, as the sheet clamping pressure adjusting means, for example, the control operation of the above-mentioned drive mechanism (contact pressure control) by the CPU of the control unit 50, specifically, will be described with reference to the control flow of FIG. .

FIG. 12 shows the swing of the swing guide 20 provided in the sheet processing apparatus B, the pair of downstream discharge rollers 17a, 1
It is a control flow explaining contact pressure control of 7b.

For example, in the staple mode, the CPU of the control unit 50 sends the staple mode, the number of sheet bundles and the size information sent from the control unit 100 of the copying machine A.
In FIG. 8, the drive motor 40b is driven (S1001) based on various sensor signals to rotate the operating gear 46 in the counterclockwise direction. When the operating gear 46 rotates in this manner, the protrusion 46b of the operating gear 46 rises and engages with the open / close arm 47 of the swing guide 20, and when the drive motor 40b further rotates thereafter, the protrusion 46b.
The swing guide 20 pressed by the opening / closing arm 47 by b is rotated upward.

After this, in FIG. 9, the swing guide 2
0 rises to a predetermined position, and the position detection sensor 55
When c detects (Y in S1003), the detection signal enters the control unit 50, and the CPU of the control unit 50 causes the drive motor 40
The driving of b is temporarily stopped (S1005). This allows
The swing guide 20 is held in the open position. Here, the holding position of the swing guide 20 is
As described above (see FIG. 5), in order to keep the contact area of the paddle 31 with respect to the sheets discharged on the staple tray 12 constant, for example, as the number of discharged sheets P on the staple tray 12 increases, It is also possible to control and change the rotation stop position of the operating gear 46 according to the change in height (level).

After the swing guide 20 is opened in this way, the sheet P is moved by the upstream discharge roller pair 16a, 16b by the operation in the stapling mode described above (see FIG. 5).
Are discharged to the staple tray 12, and then the paddle 3
The rotation of 1 and the knurled belt 32 returns the trailing edge of the sheet to a position where it abuts on the trailing edge stopper 33. At this time, the CPU of the control unit 50 drives the drive motor 40a based on the number of sheets and the size information of the sheet bundle sent from the control unit 100 in advance and based on the information of the drive motor rotation detection sensor 55a and the encoder 56a. By controlling and rotating in the clockwise direction (forward rotation) by a predetermined amount, the downstream discharge roller 17a is rotated by a predetermined amount (control) in the direction opposite to the sheet discharge direction, and the sheet P can be pulled back and conveyed. .

In this way, the predetermined number of sheets are discharged onto the staple tray 12 (S1007).
Then, the CPU of the control unit 50 restarts the driving of the driving motor 40b and FIGS. 9 to 8 and 11 based on the number of sheets and the size information sent from the control unit 100 in advance (S1009), and drives. Motor rotation detection sensor 55
Based on the information of b, the encoder 56b, and the position sensor 55c, rotation drive control is performed in a clockwise direction (forward rotation) by a predetermined amount (S1011). Then, in this way, the drive motor 4
When the drive of 0b is restarted, the protrusion 46b descends with the rotation of the operating gear 46, and the swing guide 20 also rotates downward due to its own weight, and the rotation control for a predetermined amount is completed (S).
Y of 1011) and the CPU of the control unit 50 stop the drive of the drive motor 40b (S1013), and the moving discharge roller 17b and the downstream discharge roller 17a come to a stop while sandwiching the sheet bundle.

Next, the stapling process is performed in this state by the above-described stapling mode operation (S1015), and thereafter, when the CPU of the control unit 50 receives the stapling process end information, the stapled sheet bundle is processed. In order to discharge the, the drive motor 40a is rotationally driven in the counterclockwise direction (S1017). Here, when the drive motor 40a reversely rotates in this way, as shown in FIG.
0a drives belts 42a, 42b and pulleys 42c,
It is transmitted to the downstream discharge roller 17a via 42d and the like, whereby the downstream discharge roller 17a is rotated (normally rotated) in the sheet discharge direction (the arrow direction in the drawing) to discharge the sheet bundle (S10).
19) Transport.

The CPU of the control unit 50 then drives the drive motor 40a based on the number of sheets and size information of the sheet bundle sent from the control unit 100 in advance, and based on the information of the drive motor rotation detection sensor 55a and the encoder 56a. By a predetermined amount to drive the downstream discharge roller pair 17a,
When the sheet bundle discharge control is completed (Y in S1019), the drive of the drive motor 40a is stopped (S1021), and the next operation is performed (S1023).

By the way, when the sheet is sandwiched or conveyed in this way, the operating gear 46 is stopped between the position where the projection 46b is shown by the solid line and the position shown by the alternate long and short dash line in FIG. Oscillating pressure spring 1 depending on stop
By the pulling force of 10, the downstream discharge roller pair 17a, 1
The pressure contact force of 7b is controlled (S1011 described above).

That is, the CPU of the control unit 50 is based on the number of sheets and the size information of the sheet bundle sent from the control unit 100 in advance, and the drive motor rotation detection sensor 5
5b, the encoder 56b, and the position sensor 55c, when the number of sheets to be stapled is large, as shown in FIG. 11, the drive motor 40b is rotated in the forward direction to rotate the operating gear 46 in the reverse direction and the protrusion 46b is rotated. If it is controlled to rotate to the position shown in the figure, the rocking pressure spring 11
The force of 0 becomes strong, and the pressure contact force of the downstream discharge roller pair 17a, 17b becomes high.

In this case, the CPU of the control unit 50 compares the information of the drive motor rotation detection sensor 55b for detecting the rotation speed of the roller and the pressure contact information previously stored in the control unit 50 with each other. The pressure contact force of the downstream discharge roller pair 17a, 17b can be known from the above, and the current value of the drive motor 40a for driving the downstream discharge roller 17a is increased according to the value to control the sheet and the sheet bundle to be conveyed. There is. That is, the downstream discharge roller 17a
The current value of the drive motor 40a that drives the motor is controlled so that it can be varied by the pressure of the downstream discharge roller pair 17.

By rotating the operating gear 46 in this way to change the rotation stop position of the operating gear 46, the force of the rocking pressure spring 110 can be freely changed. Thereby, for example, when discharging one sheet, the pressure contact force (pressing force) of the downstream discharge roller pair 17a, 17b
By weakening the pressure and increasing the pressure contact force when discharging the sheet bundle that has been bound or sorted, the sheet conveyance can be stabilized and the time for discharging the sheets can be shortened. . Thereby, high-speed processing can be performed and productivity is improved.

Further, when the sheet bundle is discharged, by increasing the pressing force, the unstitched (a large number of sheets not stapled) bundle is discharged and the frictional resistance between the sheets in one binding process becomes large. As a result, it is possible to suppress the slip between the sheets and discharge the sheets, and it is possible to prevent the alignment from being disturbed when the sheet bundle is discharged.

Further, the downstream discharge roller pair 17a, 17b
When the pressing force is strong, the current value of the drive motor 40a is increased, and when the pressing force is weak, the current value is decreased, so that the power consumption of the entire device can be suppressed. Further, the drive motor 40a can be miniaturized, and the entire device becomes compact.

[0076]

As described above, according to the present invention, the sheet holding pressure of the pair of rotating bodies for discharging sheets to the sheet stacking section is adjusted according to the number of sheets to be held and the size of the sheets. Further, it is possible to suppress the misalignment between the sheets of the sheet bundle and eject the sheets, and it is possible to prevent the alignment from being disturbed when the sheet bundle is ejected. In addition, the sheet bundle can be quickly discharged to the sheet stacking unit, and a decrease in productivity can be prevented.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a configuration of a copying machine which is an example of a sheet processing apparatus according to an embodiment of the present invention and an image forming apparatus including the sheet processing apparatus.

FIG. 2 is an explanatory cross-sectional configuration diagram of a finisher unit that constitutes the sheet processing apparatus.

FIG. 3 is a perspective view showing a state of a sheet discharged by an offset process by the sheet processing apparatus.

FIG. 4 is a top view showing a state in which a sheet discharged by the offset processing by the sheet processing apparatus is brought closer and a state of the discharged sheet is shown.

FIG. 5 is an enlarged view of an essential part showing a state of the sheet processing apparatus in a staple mode.

FIG. 6 is a diagram showing a two-sheet discharge control state of the sheet processing apparatus.

FIG. 7 is an enlarged view of an essential part showing a state of the sheet processing apparatus when a sheet is discharged.

FIG. 8 is a diagram illustrating a drive mechanism that swings a swing guide provided in the sheet processing apparatus.

FIG. 9 is a view showing a state when the swing guide is raised by the drive mechanism.

FIG. 10 is a block diagram illustrating control of the sheet processing apparatus.

FIG. 11 is a diagram showing how the pressure contact force of a pair of downstream discharge rollers provided in the sheet processing apparatus is adjusted.

FIG. 12 is a flowchart showing a swing guide driving mechanism provided in the sheet processing apparatus, and contact pressure control of a downstream discharge roller pair.

[Explanation of symbols]

12 Staple tray 16a, 16b upstream discharge roller pair 17a, 17b downstream discharge roller pair 18 stack tray 20 Swing guide 39 Drive mechanism 40a drive motor 40b drive motor 41 transmission gear train 46 Working gear 47 open / close arm 50 control unit 100 control unit 110 rocking pressure spring A Copy machine body B sheet processing equipment C finisher unit P sheet

Claims (8)

[Claims]
1. A sheet processing apparatus that stacks an image-formed sheet on a sheet stacking unit and then processes the sheet, and rotates the sheet while sandwiching the processed sheet to eject the sheet. A pair of rotating bodies to be discharged to the stacking unit and one rotating body of the pair of rotating bodies are rotatably held, and the one rotating body forms a sheet together with the other rotating body of the pair of rotating bodies. A holding member that is movable between a holding position and a position that separates it from the other rotating body; a first position that moves the holding member to a position that separates the one rotating body from the other rotating body; A moving unit that is movable to a second position that moves the one rotating body together with the other rotating body to a position where the sheet is sandwiched; an elastic member that connects the moving unit and the holding member; Second position Clamping pressure adjusting means for changing the elastic force acting between the moving means of the elastic member and the holding member to adjust the sheet clamping pressure of the pair of rotating bodies. Sheet processing equipment.
2. The sheet processing apparatus according to claim 1, wherein the nip pressure adjusting unit changes the second position of the moving unit according to the number of sheets to be nipped.
3. The sheet processing apparatus according to claim 1, wherein the nipping pressure adjusting means changes the second position of the moving means according to the size of the nipping sheet.
4. A driving means for rotating the other rotating body, wherein the driving current of the driving means is increased as the sheet holding pressure of the rotating body pair increases. 4. The sheet processing apparatus according to any one of items 1 to 3.
5. An image forming apparatus comprising an image forming section and a sheet processing apparatus for processing a sheet on which an image has been formed by the image forming section, wherein the sheet processing apparatus comprises: An image forming apparatus according to any one of the items.
6. An image forming unit, a sheet stacking unit for stacking sheets on which an image has been formed by the image forming unit, and a sheet stacked on the stacking unit that rotates while sandwiching the sheet to discharge the sheet. A pair of rotating bodies to be discharged to the stacking unit and one rotating body of the pair of rotating bodies are rotatably held, and the one rotating body forms a sheet together with the other rotating body of the pair of rotating bodies. A holding member that is movable between a holding position and a position that separates it from the other rotating body; a first position that moves the holding member to a position that separates the one rotating body from the other rotating body; A moving unit that is movable to a second position that moves the one rotating body together with the other rotating body to a position where the sheet is sandwiched; an elastic member that connects the moving unit and the holding member; Change the second position An image forming apparatus, comprising: clamping pressure adjusting means for varying the elastic force acting between the moving means of the elastic member and the holding member to adjust the sheet clamping pressure of the rotating body pair. .
7. The nip pressure adjusting means changes the second position of the moving means according to at least one of the number of sheets to be nipped and the size of the sheet. Image forming device.
8. The driving means for rotating the other rotating body, wherein the driving current of the driving means is increased as the sheet holding pressure of the rotating body pair increases. Alternatively, the image forming apparatus according to item 7.
JP2002105849A 2002-04-08 2002-04-08 Sheet processing apparatus and image forming apparatus therewith Withdrawn JP2003300662A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002105849A JP2003300662A (en) 2002-04-08 2002-04-08 Sheet processing apparatus and image forming apparatus therewith

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002105849A JP2003300662A (en) 2002-04-08 2002-04-08 Sheet processing apparatus and image forming apparatus therewith

Publications (1)

Publication Number Publication Date
JP2003300662A true JP2003300662A (en) 2003-10-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002105849A Withdrawn JP2003300662A (en) 2002-04-08 2002-04-08 Sheet processing apparatus and image forming apparatus therewith

Country Status (1)

Country Link
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007314322A (en) * 2006-05-26 2007-12-06 Ricoh Co Ltd Sheet carrying device, sheet processing device and image forming device
JP2010137930A (en) * 2008-12-09 2010-06-24 Nisca Corp Sheet stacking device, postprocessing device and image forming system
JP2011016599A (en) * 2009-07-07 2011-01-27 Fuji Xerox Co Ltd Postprocessing device and image forming system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007314322A (en) * 2006-05-26 2007-12-06 Ricoh Co Ltd Sheet carrying device, sheet processing device and image forming device
JP2010137930A (en) * 2008-12-09 2010-06-24 Nisca Corp Sheet stacking device, postprocessing device and image forming system
JP2011016599A (en) * 2009-07-07 2011-01-27 Fuji Xerox Co Ltd Postprocessing device and image forming system

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Effective date: 20050705