JP2004043037A - Sheet handling device and image formation device furnished with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet handling device capable of preventing abnormal stoppage due to a carrier state of a sheet and an image formation device furnished with the same. <P>SOLUTION: The sheet P is carried to sheet loading parts 12, 18 to load the sheet P to handle by sheet carrier means 16a, 16b after an image is formed, and passing of this sheet P is detected by sheet detection means 90, 91 provided on an upstream side and a downstream side of the sheet carrier means 16a, 16b. Thereafter, a control means determines whether the sheet P is normally carried in accordance with detection signals from the sheet detection means 90, 91 provided on the upstream side and the downstream side of the sheet carrier means 16a, 16b and controls this device to stop handling of the sheet P in a case of determining that the sheet P is not normally carried. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a sheet processing apparatus and an image forming apparatus including the same, and more particularly, to a configuration for determining whether processing is possible before processing a sheet.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in an image forming apparatus such as a copying machine, a printer, a facsimile, and a composite device thereof, a sheet processing apparatus that performs processing such as binding processing on a sheet discharged from the image forming apparatus main body is provided in the image forming apparatus main body. Some are provided.
[0003]
As such a sheet processing apparatus, a sheet discharged from the image forming apparatus main body is stacked on a sheet stacking unit, and after aligning the stacked sheets, a process such as a binding process is performed on the sheet (bundle). There is something like that.
[0004]
[Problems to be solved by the invention]
By the way, in such a sheet processing apparatus, for example, when performing a sheet binding process, if the sheet is greatly curled upward, as shown in FIG. 10, the sheet is placed on the stack tray 80 and the staple tray 81 constituting the sheet stacking unit. The next discharged sheet Pa comes into contact with the sequentially stacked sheets P.
[0005]
Then, when the next discharged sheet Pa comes into contact with the already loaded sheet P, as shown in FIG. 11, the next discharged sheet Pa bends and stays inside the sheet processing apparatus. become.
[0006]
Here, when the sheet Pa stays inside the sheet processing apparatus as described above, before the sheet binding process is performed, if the side edges of the sheets P and Pa are pressed to perform the aligning operation, the sheet Pa is placed in the apparatus main body. Stay in an unusual form.
[0007]
If this cannot be grasped, not only the sheet processing apparatus but also the image forming apparatus may stop abnormally. As a result, not only a failure such as breakage of the sheet occurs, but also the trouble of removing the sheet from the stopped sheet processing apparatus and the image forming apparatus and the number of sheets to be discarded increase.
[0008]
Therefore, the present invention has been made in view of such a situation, and an object of the present invention is to provide a sheet processing apparatus capable of preventing abnormal stop due to a sheet conveyance state and an image forming apparatus including the same. Things.
[0009]
[Means for Solving the Problems]
According to the present invention, in a sheet processing apparatus that processes a sheet on which an image is formed, the sheet is stacked on the sheet to be processed, and the sheet is conveyed to the sheet stacking section. Sheet conveyance means, a sheet detection means provided upstream and downstream of the sheet conveyance means for detecting passage of the sheet, and a detection signal from a sheet detection means provided upstream and downstream of the sheet conveyance means. Control means for determining whether or not the sheet has been conveyed normally, and controlling to stop processing on the sheet if it is determined that the sheet has not been conveyed normally. It is a feature.
[0010]
Further, according to the present invention, the control means detects a sheet passing time based on a detection signal sequentially input from sheet detecting means provided upstream and downstream of the sheet conveying means, and detects the detected sheet passing time. Is determined that the sheet has not been conveyed normally when the predetermined time has passed.
[0011]
Further, according to the present invention, the control unit detects a sheet conveyance speed based on a detection signal sequentially input from sheet detection units provided upstream and downstream of the sheet conveyance unit, and detects the detected sheet conveyance speed. Is determined that the sheet is not conveyed normally when the speed is lower than a predetermined conveying speed.
[0012]
Further, the present invention is characterized in that the sheet detecting means provided upstream and downstream of the sheet conveying means are arranged shifted in a direction orthogonal to the sheet conveying direction.
[0013]
According to another aspect of the present invention, there is provided an image forming apparatus including: an image forming unit; and a sheet processing apparatus configured to process a sheet after an image is formed by the image forming unit. It is characterized by being.
[0014]
Further, the present invention is characterized in that, when the control means determines that the sheet is not conveyed normally, the control means notifies the image forming apparatus main body of the stop of the processing for the sheet.
[0015]
The present invention also provides an image forming unit, a sheet stacking unit for stacking sheets on which images are formed by the image forming unit and processing the sheets, a sheet conveying unit for conveying the sheets to the sheet stacking unit, The sheet is normally conveyed based on a detection signal from a sheet detection unit provided upstream and downstream of the conveyance unit and detecting passage of the sheet, and a sheet detection unit provided upstream and downstream of the sheet conveyance unit. Control means for determining whether or not the sheet has been conveyed normally and, when it is determined that the sheet has not been conveyed normally, controlling to stop processing on the sheet.
[0016]
Further, according to the present invention, the control means detects a sheet passing time based on a detection signal sequentially input from sheet detecting means provided upstream and downstream of the sheet conveying means, and detects the detected sheet passing time. Is determined that the sheet has not been conveyed normally when the predetermined time has passed.
[0017]
Further, the present invention is characterized in that the sheet detecting means provided upstream and downstream of the sheet conveying means are arranged shifted in a direction orthogonal to the sheet conveying direction.
[0018]
Further, according to the present invention, in a sheet processing apparatus that performs processing on a sheet after loading a sheet on which an image is formed, a sheet transporting unit that transports the sheet to a sheet loading unit, and an upstream and a downstream of the sheet transporting unit. A sheet detection unit provided downstream and detecting the passage of the sheet, and whether or not the sheet is normally conveyed is determined based on a detection signal from a sheet detection unit provided upstream and downstream of the sheet conveyance unit. And control means for controlling to stop the processing on the sheet when it is determined that the sheet is not normally conveyed.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 is a view for explaining the configuration of a sheet processing apparatus according to an embodiment of the present invention and a copying machine which is an example of an image forming apparatus provided with the sheet processing apparatus. Combined and configured.
[0021]
Here, the copier optically reads a document (not shown) automatically fed from a document feeder 1 mounted on the upper part of the apparatus by a scanner unit 2, and thereafter, sends this information as a digital signal to an image forming unit 3. The image is transmitted to form an image on a sheet such as plain paper or an OHP sheet.
[0022]
A plurality of sheet cassettes 4 containing sheets (not shown) of various sizes are attached to a lower portion of the copying machine main body A, and the sheets conveyed from the sheet cassettes 4 by the conveying rollers 5 are used by the image forming unit 3. Images are formed by electrophotography.
[0023]
That is, based on information read by the scanner unit 2, a laser beam is irradiated from the light irradiation unit 3a to the photosensitive drum 3b to form a latent image, and this latent image is developed with toner to form a toner image on the photosensitive drum. To form Thereafter, the toner image is transferred to a sheet, and is conveyed to the fixing unit 6 to be permanently fixed by applying heat and pressure.
[0024]
In the case of the single-sided printing mode, the sheet is fed to the sheet processing apparatus B. In the case of the double-sided printing mode, the sheet is conveyed to the re-sending path 7 by switchback, and the sheet on which an image is formed on one side is conveyed to the image forming unit 3 again. Then, an image is formed on the other side, and thereafter, the image is fed to the sheet processing apparatus B. The sheet can be fed not only from the sheet cassette 4 but also from the multi-tray 8.
[0025]
On the other hand, the sheet processing apparatus B includes a finisher unit C capable of sorting sheets on which images are formed by the copying machine main body A by the number of copies, and a stitcher unit D capable of binding a plurality of sheets and folding and binding. are doing.
[0026]
Here, when the sheet is discharged, the finisher unit C performs a discharge process according to each mode such as an offset mode and a staple mode in addition to the normal discharge mode.
[0027]
Here, the staple mode is an operation mode in which sheets are stacked and aligned on the staple tray 12 when the sheets are sorted and discharged for each number of copies, stapled by the stapler 13, and bound and discharged for each number of copies.
[0028]
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. This is an operation mode in which the sheet is shifted in a direction perpendicular to the sheet conveying direction) so that the boundaries of the respective parts can be recognized.
[0029]
Next, the operation of the finisher unit C will be described in detail.
[0030]
In the case of the normal discharge mode, the sheet P discharged from the copying machine main body A is conveyed to the finisher unit C, so that the sheet P is sent to the transport roller 15 shown in FIG. The sheet P is guided by the first flapper 21 and the second flapper 22 and is conveyed by the conveying roller 15, and then the upstream discharge roller is rotated. The sheet is discharged onto the stack tray 18 shown in FIG. 1 by the pair 16a, 16b and the pair of downstream discharge rollers 17a, 17b.
[0031]
A plurality of the stack trays 18 are provided so as to be movable in the vertical direction, and are moved in the vertical direction by a driving source (not shown) built in a lower part thereof. Then, in the case of the sort discharge, the sheets P can be discharged in a state where the sheets P are sorted for each copy by sequentially moving the plurality of stack trays 18 to the discharge port 36.
[0032]
In the case of the offset mode and the staple mode, it is possible to perform the offset processing or the stapling processing on one stack tray 18 and discharge the sheets in a sorted state. Further, in the case of the interruption mode, the sheet can be discharged to the upper tray 19 without being discharged to the stack tray 18.
[0033]
Next, the offset mode will be described.
[0034]
In the case of the offset mode, as shown in FIG. 3, when all copies are discharged to one stack tray 18 and when the sheets are discharged in units of copies, the first sheet P1 of each part is replaced with the second and subsequent sheets. The sheet P is shifted in the sheet width direction relative to the sheet P. This makes it possible to clarify the boundaries between the parts.
[0035]
Here, in the present embodiment, in addition to the above-described control of shifting the first sheet of each unit in the width direction, the sorting process in the offset mode includes shifting the entire sheet bundle in the sheet width direction. One of the bundle offset modes for clearing the boundary of the number of copies can be selected.
[0036]
For this purpose, a downstream discharge roller 17a provided on the unit main body B1, which constitutes the downstream discharge roller pair 17a, 17b, and an oscillating guide 20 that can oscillate about a rotation axis with respect to the unit main body B1 are attached. When the swing guide 20 is opened upward, the movable discharge rollers 17b are separated from each other as shown in FIG.
[0037]
Further, between the pair of upstream discharge rollers 16a and 16b and the pair of downstream discharge rollers 17a and 17b, a side guide 11 as an alignment means for pressing one side end in the width direction of the sheet P is provided as shown in FIG. It is configured to be movable in the width direction.
[0038]
Thus, for example, when all copies are discharged to one stack tray 18 and the discharge is performed in units of copies, the first sheet P1 of each copy to be sorted is discharged, and the rear end of the sheet is the upstream discharge roller pair 16a. , 16b and the pair of downstream discharge rollers 17a, 17b, when the swing guide 20 is opened upward as shown in FIG. The roller 17b is separated. Thereafter, when the side guide 11 is moved in the direction of the arrow shown in FIG. 4, the first sheet P1 moves by a predetermined amount.
[0039]
Next, the swing guide 20 is closed, the sheet P1 is discharged to the stack tray 18, and thereafter, the second and subsequent sheets P are normally discharged, as shown in FIG. 3 and FIG. The sheets of each copy are discharged in a state where the sheet P1 is shifted. If there is no space for moving the sheet by a predetermined amount with respect to the sheet width direction size, the reference guide 37 is retracted below the staple tray 12 to secure a sufficient sheet moving amount.
[0040]
On the other hand, at the time of the bundle offset, the sheets to be sorted by the above-described configuration are stacked and aligned on the staple tray 12, and when the plurality of sheets are accumulated, the side guide 11 is moved in the arrow direction shown in FIG. Is moved by a predetermined amount. Thereafter, this operation is repeated for the sheet bundle to be offset, and the boundary is clarified for each bundle.
[0041]
In the present embodiment, the finisher unit C is capable of performing a multi-sheet discharge control capable of simultaneously discharging a large number of sheets, in addition to a normal discharge control for discharging sheets one by one. Has become. Here, in the multi-sheet discharge control, the sheet sent from the copying machine main body A to the sheet processing apparatus B is retained in the buffer path 14 provided in the finisher unit C, and is superimposed on the next sheet to be discharged. This is an operation control for ejecting a large number of sheets simultaneously.
[0042]
Next, two-sheet ejection control will be described as an example of such multiple-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 subjected to the offset processing, the first flapper 21 and the second flapper 22 are provided as shown in FIG. Is located downward, whereby the second sheet P <b> 2 is sent to the buffer path 14.
[0043]
The preceding sheet (second sheet in the case of the offset mode) P2 sent to the buffer path 14 is driven by a buffer roller 23 that is driven and rotated and a buffer roller 24 that is pressed against the sheet P2 and is driven to rotate. 23 and is sent in the direction of the arrow shown in the figure. At this time, the third flapper 25 rotates so that the preceding sheet P2 is fed in a direction in which the preceding sheet P2 is wound around the buffer roller 23.
[0044]
Next, the leading edge of the preceding sheet P2 is detected by the buffer sensor 26, 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 stopped in the buffer path 14. Then, when the succeeding sheet (third sheet in the case of the offset mode) P3 enters in this state, the buffer roller 23 starts rotating. Thereby, as shown in FIG. 6, the preceding sheet P2 and the following sheet P3 are conveyed in an overlapping state.
[0045]
Further, when the rear end of the preceding sheet P2 has passed the position of the third flapper 25, the third flapper 25 rotates so that the two sheets P2 and P3 are fed in the direction of the upstream discharge roller pair 16, and As a result, the sheets P2 and P3 are discharged onto the stack tray 18 in a state where two sheets are overlapped.
[0046]
Here, by performing such a two-sheet discharge control operation, the sheet is not discharged from the pair of upstream discharge rollers 16a and 16b during the offset processing operation. No need to stop. For this reason, even in the offset mode, the processing time does not become long, and quick offset discharge can be performed.
[0047]
Next, the staple mode will be described.
[0048]
In the case of the staple mode, the swing guide 20 is opened as shown in FIG. 5 and the sheet P is discharged to the staple tray 12 by the pair of upstream discharge rollers 16a and 16b. The knurl belt 32 rotated by the drive of the upstream lower discharge roller 16a is rotated in the direction of the arrow to return the sheet P to a position where the rear end of the sheet P contacts the rear end stopper 33. After the sheet P is pushed to one side by the side guide 11 and aligned, the swing guide 20 is closed, and the bundle of sheets P is nipped by the pair of downstream discharge rollers 17a and 17b to be stapled by the stapler 13.
[0049]
Here, the swing guide 20 rotatably holds the movable discharge roller 17b, and at the time of discharging the sheet, swings downward about the swing shaft 20a as a fulcrum by a drive mechanism (not shown) as shown in FIG. While pressing the discharge roller 17b against the downstream discharge roller 17a, in the staple mode, the drive mechanism swings upward about the swing shaft 20a as a fulcrum to separate the movable discharge roller 17b from the downstream discharge roller 17a. It is. That is, the swing guide 20 plays a role as a switching unit for setting the movable discharge roller 17b and the downstream discharge roller 17a to a sheet dischargeable state or a sheet discharge disabled state.
[0050]
In the figure, reference numeral 34 denotes a stopper provided with a shutter portion 34a. When the stack tray is moved, the link 35 is pivoted upward about the pivot shaft 35a to raise the shutter portion 34a formed at the end. This prevents the sheets (or sheet bundle) stacked on the stack tray 18 from flowing back to the discharge port 36 when the stack tray 18 passes through the discharge port 36 by closing the discharge port 36. . When the sheet is discharged, the link 35 rotates downward about the rotation shaft 35 a as a fulcrum, and the stopper 34 opens the discharge port 36.
[0051]
Next, the stapling operation will be described.
[0052]
When the stapling operation is performed, as described above, the bundle of sheets P stacked on the stack tray 18 and the staple tray 12 is held between the downstream discharge roller pairs 17a and 17b. Can be Here, various combinations can be considered for the binding position (staple position). In the present embodiment, a mode for binding one corner of the sheet and a mode for binding two sides can be selected. .
[0053]
On the other hand, when the binding process is completed, the downstream discharge roller pairs 17a and 17b rotate in the transport direction and discharge the bundle of sheets P to the stack tray 18.
[0054]
By the way, in the various sheet processing modes described above, the normally ejected sheet is ejected onto the sheet stacking unit constituted by the stack tray 18 and the staple tray 12, and is then adjusted by the rear end stopper 33. Loaded at.
[0055]
However, at this time, when the leading end of the sheet P is largely curled upward, the sheet to be discharged next comes into contact with the already loaded sheet as shown in FIG. The sheet is bent in the sheet processing apparatus and stays in the sheet processing apparatus, causing an obstacle in the alignment for processing the sheet.
[0056]
Therefore, in the present embodiment, as shown in FIG. 8, for example, the first sheet detecting means which detects the passage of the trailing end of the sheet upstream and downstream of the pair of upstream discharge rollers 16a and 16b is used. And second optical sensor detectors 90 and 91 are provided.
[0057]
FIG. 12 is a diagram for explaining control of the above-described sheet processing apparatus. The CPU of the control unit 50 stores therein a program and a measurement data table corresponding to the operation description to be described later, and executes them to execute the sheet processing apparatus. The control in B and the communication with the copying machine main body A are performed. The control unit 50 is connected to the control unit 100 of the copying machine main body A, the first optical sensor detection unit 90, the second optical sensor detection unit 91, the transport motor 223 that drives the upstream lower discharge roller 16a, and the like. Exchanges sensor information, control signals, etc. with the sensors, sensor units, motors, etc.
[0058]
Here, the detection signals of these two optical sensor detection units 90 and 91 are input to, for example, the control unit 50 as control means provided in the sheet processing apparatus B as shown in FIG. The control unit 50 detects the sheet passage time based on the detection signals sequentially input from the first and second optical sensor detection units 90 and 91, and detects the sheet passage time thus detected and the control unit 50. Is compared with a predetermined passage time of a measurement data table stored inside the CPU.
[0059]
Here, the predetermined transit time is a transit time when the sheet is normally discharged without being hindered by the previously discharged sheet, and the predetermined transit time and the detected sheet transit time are By making the comparison, the CPU of the control unit can determine whether the sheet has been normally discharged.
[0060]
Next, the detection operation according to the present embodiment will be described with reference to FIG.
[0061]
As described above, the sheet P conveyed from the copying machine main body A is stacked on the stack tray 18 and the staple tray 12 by the pair of upstream discharge rollers 16a and 16b. At this time, each time the sheet P passes from the first optical sensor detection unit 90 and the second optical sensor detection unit 91, the control unit 50 outputs a signal indicating that the detection unit detects the leading end of the sheet P and the trailing end of the sheet P. Receive the detected signal. The control unit 50 detects the passage time of the sheet based on the detection signals, compares the passage time with the predetermined data of the measurement data table stored therein as described above, and determines whether the sheet is conveyed normally. Judge. If normal, continue the process. The process is continued. For example, as shown in FIG. 9, a sheet P curled upward largely is stacked on the stack tray 18 and the staple tray 12, and a sheet Pa to be discharged next is placed on the curled sheet P. When the sheet Pa comes into contact, the conveyance speed of the sheet Pa is reduced by the contact, and the sheet passing time becomes longer.
[0062]
Then, when the sheet passage time becomes long as described above, the control unit 50 determines that the conveyance of the sheet Pa is abnormal. The control unit 50 communicates with the control unit 100 of the copying machine main body A, and when determining that there is an abnormality in the conveyance of the sheet Pa, first stops the driving of the conveyance motor 223, stops the sheet conveyance, and thereafter Stop processing the sheet. Next, the control unit 100 of the copier main body A stops processing for a series of sheets such as image formation and sheet conveyance via the copier main body A, and a display unit (not shown) provided in the copier main body A. Is displayed to notify the user of the stop of the processing for the sheet. Thus, it is possible to prevent not only the sheet processing apparatus B but also the copying machine main body A from abnormally stopping due to a sheet jam or the like.
[0063]
Further, in the present embodiment, the control unit 50 is provided in the sheet processing apparatus B. However, the control unit 50 may be provided in the copier main unit A and controlled from the copier main unit A.
[0064]
As described above, the first and second optical sensor detectors 90 and 91 for detecting the passage of the trailing edge of the sheet are provided upstream and downstream of the pair of upstream discharge rollers 16a and 16b, respectively. It is determined whether or not the sheet has been conveyed normally based on the detection signals from 90 and 91. If it is determined that the sheet has not been conveyed normally, the processing for the sheet is stopped. An abnormal stop of the sheet processing apparatus B and the copying machine main body A can be prevented.
[0065]
By preventing the sheet processing apparatus B and the copying machine main body A from abnormally stopping in this way, it is possible to prevent the occurrence of an obstacle such as breakage of a sheet. The effort for removing the sheets and the number of sheets to be discarded can be reduced.
[0066]
In the above description, the case where it is determined whether or not the sheet has been normally conveyed by detecting the passage time of the sheet based on the detection signals from the first and second optical sensor detection units 90 and 91. However, the present invention is not limited to this, and the present invention detects whether the sheet is normally conveyed by detecting the conveying speed of the sheet based on the detection signals from the first and second optical sensor detecting units 90 and 91. It may be determined whether or not it is not.
[0067]
On the other hand, the first and second optical sensor detectors 90 and 91 are provided so as to be shifted from each other in a direction orthogonal to the sheet conveying direction, and after the detection signal from the first optical sensor detector 90 is inputted, the second optical sensor If the time until the detection signal is input from the unit 91 is measured, it can be determined that the sheet is in a skew state.
[0068]
That is, when the sheet is not in the skew state, the detection signal from the second optical sensor detection unit 91 is input within a certain period after the detection signal from the first optical sensor detection unit 90 is input. Is in a skew state, the detection signal from the second optical sensor detection unit 91 is not input within a certain period. Therefore, if the time from when the detection signal from the first optical sensor detection unit 90 is input to when the detection signal from the second optical sensor detection unit 91 is input is measured, whether or not the sheet is in a skew state is determined. Can be determined.
[0069]
In the above description, the optical sensor is used as the detection unit that detects the passage of the trailing edge of the sheet. However, the present invention is not limited to this, and a mechanical sensor such as a contact sensor may be used.
[0070]
【The invention's effect】
As described above, as in the present invention, it is determined whether or not the sheet has been normally conveyed based on the detection signals from the sheet detection means provided upstream and downstream of the sheet conveyance means, and the sheet is conveyed normally. If it is determined that the sheet has not been processed, by stopping the processing on the sheet, it is possible to prevent abnormal stop due to the sheet conveyance state.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a configuration of a sheet processing apparatus according to an embodiment of the present invention and a copying machine that is an example of an image forming apparatus including the same.
FIG. 2 is an explanatory cross-sectional configuration diagram of a finisher unit included in the sheet processing apparatus.
FIG. 3 is a perspective view showing a state of a sheet discharged by offset processing by the sheet processing apparatus.
FIG. 4 is a top view showing a state of a sheet that is discharged by offset processing performed by the sheet processing apparatus and a state of the discharged sheet.
FIG. 5 is an enlarged view of a main part showing a state in a staple mode of the sheet processing apparatus.
FIG. 6 is a diagram illustrating a state of two-sheet discharge control of the sheet processing apparatus.
FIG. 7 is an enlarged view of a main part showing a state when the sheet processing apparatus discharges a sheet.
FIG. 8 is an enlarged view of the vicinity of a discharge port of the sheet processing apparatus.
FIG. 9 is a diagram illustrating a state in which a sheet to be discharged next comes into contact with a sheet curled upward largely at the leading end stacked on the stack tray and the staple tray of the sheet processing apparatus.
FIG. 10 is an enlarged view of the vicinity of a discharge port of a conventional sheet processing apparatus.
FIG. 11 is a diagram illustrating a state in which a sheet to be discharged next comes into contact with a sheet curled upward largely at a leading end stacked on a stack tray and a staple tray of a conventional sheet processing apparatus.
FIG. 12 is a block diagram illustrating control of the sheet processing apparatus according to the embodiment of the present invention.
[Explanation of symbols]
12 Staple tray
16a, 16b Upstream discharge roller pair
17a, 17b Downstream discharge roller pair
18 Stack tray
20 Swing guide
90 First Optical Sensor Detector
91 Second Optical Sensor Detector
50 control unit
100 control unit
A main body of image forming apparatus
B sheet processing equipment
C Finisher unit
P sheet

Claims (10)

After stacking the sheets on which the images are formed, in a sheet processing apparatus that performs processing on the sheets,
A sheet stacking unit for stacking sheets to be processed,
Sheet conveying means for conveying the sheet to the sheet stacking unit,
Sheet detection means provided upstream and downstream of the sheet conveying means and detecting passage of the sheet,
When it is determined whether or not the sheet has been normally conveyed based on a detection signal from sheet detection means provided upstream and downstream of the sheet conveyance means, and when it is determined that the sheet has not been conveyed normally, Control means for controlling to stop processing on the sheet;
A sheet processing apparatus comprising: The control unit detects a sheet passage time based on a detection signal sequentially input from sheet detection units provided upstream and downstream of the sheet conveyance unit, and the detected sheet passage time is a predetermined passage time. 2. The sheet processing apparatus according to claim 1, wherein it is determined that the sheet is not conveyed normally when the number of sheets is exceeded. The control unit detects a sheet conveyance speed based on detection signals sequentially input from sheet detection units provided upstream and downstream of the sheet conveyance unit, and the detected sheet conveyance speed is a predetermined conveyance speed. 2. The sheet processing apparatus according to claim 1, wherein it is determined that the sheet is not conveyed normally when the sheet is later than the predetermined time. 4. The sheet processing apparatus according to claim 1, wherein sheet detection units provided upstream and downstream of the sheet conveyance unit are arranged to be shifted in a direction orthogonal to a sheet conveyance direction. 5. In an image forming apparatus including an image forming unit and a sheet processing apparatus that processes a sheet after an image is formed by the image forming unit,
The image forming apparatus according to claim 1, wherein the sheet processing apparatus is an apparatus according to claim 1. 6. The image forming apparatus according to claim 5, wherein when the control unit determines that the sheet is not conveyed normally, the control unit notifies the image forming apparatus main body that processing of the sheet has stopped. An image forming unit, a sheet stacking unit that stacks sheets on which images are formed by the image forming unit and processes the sheets,
Sheet conveying means for conveying the sheet to the sheet stacking unit,
Sheet detection means provided upstream and downstream of the sheet conveying means and detecting passage of the sheet,
When it is determined whether or not the sheet has been normally conveyed based on a detection signal from sheet detection means provided upstream and downstream of the sheet conveyance means, and when it is determined that the sheet has not been conveyed normally, Control means for controlling to stop processing on the sheet;
An image forming apparatus comprising: The control unit detects a sheet passage time based on a detection signal sequentially input from sheet detection units provided upstream and downstream of the sheet conveyance unit, and the detected sheet passage time is a predetermined passage time. 8. The image forming apparatus according to claim 7, wherein it is determined that the sheet is not conveyed normally when the number of sheets is exceeded. 9. The image forming apparatus according to claim 7, wherein the sheet detection units provided upstream and downstream of the sheet conveyance unit are shifted in a direction perpendicular to the sheet conveyance direction. After stacking the sheets on which the images are formed, in a sheet processing apparatus that performs processing on the sheets,
Sheet conveying means for conveying the sheet to a sheet stacking unit,
Sheet detection means provided upstream and downstream of the sheet conveying means and detecting passage of the sheet,
When it is determined whether or not the sheet has been normally conveyed based on a detection signal from sheet detection means provided upstream and downstream of the sheet conveyance means, and when it is determined that the sheet has not been conveyed normally, Control means for controlling to stop processing on the sheet;
A sheet processing apparatus comprising:

Images