JP6880558B2 - Paper transport equipment and post-processing equipment - Google Patents

Description

The present invention relates to a paper transport device and a post-processing device.

For example, a paper transport device incorporated in an image forming apparatus and a paper conveying device incorporated in a post-processing device connected to an image forming apparatus employ a stepping motor as a drive motor for driving a conveying roller for conveying paper. There is.

Since the stepping motor rotates in synchronization with the input control pulse signal, the position can be guaranteed by open loop control, but for example, due to overload or sudden speed change, the control pulse signal and the motor rotation If synchronization is lost, step out (misstep) and stop. Therefore, if step-out occurs during paper transportation, a paper jam occurs, and the user is required to remove the jammed paper.

Here, when the first stepping motor that drives the first transfer roller located on the downstream side of the paper transfer path is out of step, the second transfer roller located on the upstream side of the first transfer roller is driven. Stop the second stepping motor. At this time, the paper conveyed by the first transfer roller and the second transfer roller is deflected based on the difference in stop time (the time from the stop of the first transfer roller to the stop of the second transfer roller). It will occur. Therefore, when the second stepping motor and the stepped-out first stepping motor are simultaneously re-driven and the bent paper is re-conveyed as it is, jam may occur.

On the other hand, in the technique described in Patent Document 1, the stepped-out first stepping motor is re-driven at the timing of re-driving the second stepping motor according to the difference in the stop time measured by the timer. By re-transporting the paper later than the timing, the occurrence of jam is suppressed.

Japanese Unexamined Patent Publication No. 2014-88244

However, the paper transport state when the second stepping motor is stopped does not correspond only to the difference in the stop time. For example, when the paper is displaced from the transport belt due to slipping of the paper or the like, a deflection larger than or smaller than the expected deflection based on the difference in the stop time occurs. Therefore, when the paper in this state is re-conveyed, the bending or pulling of the paper becomes a load, and there is a problem that the paper is re-stepped out at the time of re-driving, and a problem that the bending of the paper is nipated by the transport roller and the paper is wrinkled. Occurs.

The present invention has been made to solve the problems associated with the above-mentioned prior art, and when re-driving a step-out drive motor, the paper is conveyed without re-step-out and without causing wrinkles on the paper. It is an object of the present invention to provide a paper transport device and a post-processing device to obtain.

The above object of the present invention is achieved by the following means.

(1) The first and second drive motors, which are arranged along the paper transport path and drive the first and second transport rollers for transporting the paper, respectively.
The first and second control devices that control the first and second drive motors, respectively ,
It has a first rotation amount detector that detects the rotation of the second drive motor, and
The first drive motor comprises a stepping motor.
The first transport roller is located on the downstream side of the paper transport path from the second transport roller.
Wherein the first control device, after the stopping of the previous SL first driving motor is detected, is configured to re-drive the first drive motor,
The second control device is
If the stop of the previous SL first driving motor is detected, quenched with rotatable state drive of the second drive motor, then, driven by the conveyance of the sheet by said first drive motor is re-driven When the rotation of the second drive motor is detected by the first rotation amount detector, the paper transport device is configured to redrive the second drive motor. ..
(2) The paper transport device according to (1) above, further comprising a first step-out detector that detects the stoppage of the first drive motor by detecting the step-out of the first drive motor.

( 3 ) Further having a first encoder provided in the first drive motor,
The paper transport device according to (2 ) above, wherein the first step-out detector detects step-out of the first drive motor based on the number of output pulses of the first encoder.

( 4 ) The first step-out detector is a difference between the number of output pulses of the first encoder and the target value of the number of output pulses of the first encoder corresponding to the number of control pulses for controlling the first drive motor. The paper transport device according to (3 ) above, wherein the step-out of the first drive motor is detected based on the above.

(5) Further having a second encoder provided in the second drive motor,
Said first rotation amount detector, based on the number of output pulses of the second encoder, one of said, characterized in that for detecting the rotation amount of the second drive motor (1) to (4) 1 The paper transport device according to the section.

( 6 ) The first rotation amount detector determines that the second drive motor is rotating when the number of output pulses of the second encoder exceeds a predetermined value ( 5 ). The paper transport device according to.

( 7 ) The output pulse number of the second encoder when the second drive motor is rotated once is larger than the control pulse number for rotating the first drive motor once ( 5 ). Alternatively, the paper transport device according to (6) above.

( 8 ) A third and fourth drive motors arranged along the paper transport path and driving the third and fourth transport rollers for transporting paper, respectively, and a third and fourth drive motors for controlling the third and fourth drive motors, respectively. Further having 3 and 4 control devices,
The third transfer roller is located on the upstream side of the paper transfer path from the second transfer roller, and the fourth transfer roller is located on the upstream side of the paper transfer path from the third transfer roller.
When the stop of the first drive motor is detected, the third control device stops the drive of the third drive motor, and after the second drive motor is redriven, the third drive motor is turned on. Configured to redrive,
When the stop of the first drive motor is detected, the fourth control device stops the drive of the fourth drive motor, and after the third drive motor is redriven, the fourth drive motor is turned on. The paper transport device according to any one of (1) to (7 ) above, which is configured to be redriven.

( 9 ) Further having a paper position detector for detecting the position of the rear end of the paper passing through the third transport roller in the paper transport path.
The third control device is
When the third drive motor is re-driven, the third drive motor is driven at a second transfer speed slower than the first transfer speed before stopping the drive of the third drive motor.
When the paper position detector detects that the rear end of the paper being conveyed at the second transfer speed has passed through the third transfer roller, the third drive motor is driven at the first transfer speed. Configured to
The fourth control device is
When the paper position detector detects that the rear edge of the paper being conveyed at the second transfer speed has passed through the third transfer roller, the fourth drive motor is configured to be re-driven. The paper transport device according to (8 ) above, wherein the paper transport device is characterized by the above.

( 10 ) The paper transport device according to any one of (1) to (9 ) above, wherein the second drive motor is a stepping motor.

( 11 ) A third drive motor that is arranged upstream of the second transport roller along the paper transport path and drives a third transport roller that transports paper.
A third control device that controls the third drive motor ,
It has a second rotation amount detector that detects the rotation of the third drive motor, and has.
The second drive motor comprises a stepping motor.
The second control unit, after the stop of the previous SL second driving motor is detected, is configured to re-drive the second drive motor,
The third control device is
If the stop of the previous SL second driving motor is detected, quenched with rotatable state driving of the third drive motor, then, driven by the conveyance of the sheet by said second drive motor is re-driven When the rotation of the third drive motor is detected by the second rotation amount detector, the third drive motor is configured to redrive the third drive motor (1). ) To ( 7 ). The paper transport device according to any one of the items.

( 12 ) A post-processing apparatus comprising the paper transport apparatus according to any one of (1) to ( 11) above.

( 13 ) The post-processing device according to (12 ) above, further comprising a processing unit that executes a process of generating an impact load on the paper transported by the paper transport device.

( 14 ) The post-processing apparatus according to (13 ) above, wherein the process comprises a process of reversing the paper.

In the paper transport device and the post-processing device according to the present invention, after the first drive motor has stepped out, the second drive motor rotates in accordance with the paper transport due to the re-drive of the first drive motor. If it is detected, the second drive motor is redriven. That is, the second drive motor is re-driven by actually measuring the conveyed state of the paper (by detecting the driven rotation of the second drive motor, which means that the deflection of the paper is eliminated). Paper is accurately conveyed without the drive motor re-stepping out and without deflection. Therefore, it is possible to provide a paper transport device and a post-processing device capable of transporting paper without retuning and without causing wrinkles on the paper when the first drive motor that has been detuned is redriven.

It is the schematic for demonstrating the image formation system which concerns on embodiment of this invention. It is sectional drawing for demonstrating the post-processing apparatus shown in FIG. It is the schematic for demonstrating the paper transport apparatus shown in FIG. It is a figure for demonstrating the redrive condition of the 2nd drive motor shown in FIG. It is a flowchart for demonstrating operation of a paper transport apparatus. It is the schematic for demonstrating step S10 shown in FIG. It is the schematic for demonstrating step S11 shown in FIG. It is the schematic for demonstrating step S12 shown in FIG. It is the schematic for demonstrating step S14 shown in FIG. It is the schematic for demonstrating step S15 shown in FIG. It is the schematic for demonstrating step S18 shown in FIG. It is the schematic for demonstrating the modification 1 which concerns on embodiment of this invention. It is a flowchart for demonstrating the modification 1 which concerns on embodiment of this invention. It is the schematic for demonstrating the modification 2 which concerns on embodiment of this invention. It is the schematic for demonstrating the modification 3 which concerns on embodiment of this invention. It is the schematic for demonstrating the modification 4 which concerns on embodiment of this invention. It is the schematic for demonstrating the modification 5 which concerns on embodiment of this invention. It is the schematic for demonstrating the modification 6 which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The dimensional ratios in the drawings are exaggerated for convenience of explanation and may differ from the actual ratios.

FIG. 1 is a schematic view for explaining an image forming system according to an embodiment of the present invention, FIG. 2 is a sectional view for explaining the post-processing apparatus shown in FIG. 1, and FIG. 3 is shown in FIG. It is the schematic for demonstrating the shown paper transporting apparatus.

The image forming system 10 shown in FIG. 1 includes an image forming device 20 and a post-processing device 100. The image forming apparatus 20 is, for example, an MFP (MuLti-Function Peripheral) having a copy function, a printer function, and a scanning function, and is used for generating image data from print data and forming (printing) an image on paper. To. The post-processing device 100 is connected to the image forming device 20 and is used to perform post-processing on the paper bundle PB. The paper bundle PB is formed by stacking a plurality of papers P on which an image is formed in the image forming apparatus 20. The post-processing is a saddle stitch binding process or a small-edge cutting process.

As shown in FIG. 2, the aftertreatment device 100 includes a control unit 110, a storage unit 115, a paper loading unit 120, a middle folding unit 160, a saddle stitching unit 165, a paper bundle transporting unit 170, a cutting unit 175, and cutting waste storage. It has a unit 180, a paper ejection unit 185, and a communication interface unit 190.

The control unit 110 is a control circuit composed of a microprocessor or the like that executes control of each of the above units and various arithmetic processes according to a program, and each function of the post-processing device 100 follows an instruction from the image forming device 20. This is exhibited when the control unit 110 executes a program corresponding to the control unit 110.

The storage unit 115 is configured by appropriately combining a high-speed random access storage device that temporarily stores programs and data as a work area, and a large-capacity random access storage device that stores various processing programs and various data.

The stored data includes control data and post-processing setting data necessary for executing post-processing jobs (bookbinding job and cutting job). The stored programs include a paper transport device control program 116 (described later), a bookbinding program, and a cutting program. The bookbinding program is used to stack a plurality of sheets P on which an image is formed to form a paper bundle PB, and saddle stitch the paper bundle with a staple to bind the paper. The cutting program is used to cut the edges of a saddle-stitched bound paper bundle PB. In the present embodiment, the end portion of the paper bundle PB is an edge which is a free end on the opposite side of the saddle stitch portion of the paper bundle PB.

The paper loading unit 120 has a paper transporting device 125 (described later) and a paper reversing section 150, and is used for receiving the paper from the image forming device 20 and transporting the paper toward the center folding section 160.

The paper reversing unit 150 is located on the downstream side of the paper transport path from the paper transport device 125, has a standby section 152, and flips the paper P supplied from the paper transport device 125 (turning over) to form, for example, an image. It is used to ensure that the surface is located inside when folded in the middle. The standby unit 152 is used to temporarily stop the entire paper P in a state along a vertical direction orthogonal to the paper transport direction. That is, the paper reversing unit 150 constitutes a processing unit that executes a process of generating an impact load on the paper conveyed by the paper conveying device.

Specifically, the paper P is lowered in the vertical direction, and the entire paper P is positioned on the standby unit 152. After that, the paper P is raised in the vertical direction and conveyed to the downstream side in the paper conveying direction. As a result, the front surface and the back surface of the paper P before being loaded into the paper reversing unit 150 are inverted (turned over) at the paper reversing unit 150, and at the time of being carried out from the paper reversing unit 150, the back surface and the back surface of the paper P are It will be located on the surface.

The middle fold portion 160 has a pair of rollers 161 and 162 that rotate in opposite directions and a protruding member 163 that is aligned between the rollers 161 and 162, and creases the paper P to fold the paper P in the middle. Used to do. For example, after positioning the central portion of the paper P in the paper transport direction below the rollers 161, 162, the protruding member 163 is pressed from the back side of the paper P toward the space between the rollers 161, 162. As a result, the central portion of the paper P is sandwiched by the rollers 161, 162 while being supported by the protruding member 163, creases are formed, and the paper P is folded in the middle.

The saddle stitching portion 165 has a saddle stitching portion 166, a needle receiving mechanism 167, and a needle striking mechanism portion 168 having staple needles 169, and a paper bundle PB (a plurality of folded paper bundles PB) placed on the saddle stitching portion 166. Paper P laminate) is used for saddle stitching.

Specifically, the paper bundle PB is arranged on the saddle portion 166 having two orthogonal guide surfaces. Then, with the needle receiving mechanism 167 arranged near the top of the saddle portion 166 elastically supporting the folds of the paper bundle PB, the needle receiving mechanism 167 is positioned above the folds of the paper bundle PB. Raise towards section 168. As a result, the creases of the paper bundle PB are pressed (contacted) with the needle striking mechanism portion 168 and saddle stitched by the staple needle 349 held by the needle striking mechanism portion 168.

The paper bundle transport unit 170 has a pair of arms 171 and 172 configured so as to be close to each other and can be separated from each other, and is used for transporting and holding (supporting) the saddle-stitched paper bundle PB. For example, the arms 171 and 172 convey the saddle-stitched paper bundle PB from the saddle-stitched portion 165 to the cutting section 175 while sandwiching the spine cover portion of the saddle-stitched paper bundle PB, and then the cutting section. It is supported (held) during cutting at 175, and is conveyed to the paper ejection unit 185 after cutting.

The cutting unit 175 is used to cut the end portion (edge) of the saddle-stitched paper bundle PB. As a result, the edges that are uneven depending on the number of sheets P forming the paper bundle PB are cut, so that the appearance of the paper bundle PB is improved.

The cutting waste accommodating unit 180 is used for accommodating the cutting waste cut from the saddle-stitched paper bundle PB in the cutting unit 175. The cutting waste accommodating unit 180 is arranged directly below the cutting unit 175, and is configured so that the cutting waste falls due to its own weight and is accommodated in the cutting waste accommodating unit 180.

The paper ejection unit 185 has a paper ejection tray 187 arranged on the outside of the aftertreatment device 100, and is used for ejecting a paper bundle (saddle stitched paper bundle) PB conveyed from the cutting unit 175. Will be done.

The communication interface unit 190 is used to transmit / receive data to / from the image forming apparatus 20. The data is control data and post-processing setting data necessary for executing a post-processing job (bookbinding job and cutting job) in the post-processing device 100.

Next, the paper transport device will be described.

As shown in FIG. 3, the paper transport device 125 includes first to fourth transport rollers 130, 135, 140, 145, first to fourth drive motors 131, 136, 141, 146, first and second encoders. It has 132, 137, first to fourth control devices 133, 138, 143, 148, first step-out detector 134, first rotation amount detector 139, and paper position detector 149.

The first to fourth transport rollers 130, 135, 140, and 145 are sequentially arranged from the downstream side to the upstream side of the paper transport path. The first transport roller 130 is adjacent to the paper reversing portion 150. Further, although omitted in FIG. 3 (the same applies to FIGS. 6A to 7 and 9 to 13 described later), the first to fourth transport rollers 130, 135, 140, and 145 are used as paired rollers, respectively. The paper is in contact with each other (see FIG. 2), and the paper is conveyed by sandwiching the paper P in the nip between these paired rollers.

The first to fourth drive motors 131, 136, 141, 146 are arranged to drive the first to fourth transport rollers 130, 135, 140, 145, respectively, and are composed of stepping motors. The second drive motor 136 is configured to be rotatable in a state where the drive is stopped. Further, all of the first to fourth transport rollers 130, 135, 140, and 145 are not limited to the form configured by the stepping motor.

The first to fourth control devices 133, 138, 143, 148 are arranged to control the first to fourth drive motors 131, 136, 141, 146, respectively, and are connected to the control unit 110. ing.

The first encoder 132 is provided in the first drive motor 131. The second encoder 137 is provided in the second drive motor 136.

The first step-out detector 134 is configured to detect the step-out of the first drive motor 131 based on the number of output pulses of the first encoder 132, and is incorporated in the first control device 133 (provided). ing). Step-out occurs, for example, due to loss of synchronization between the control pulse signal and motor rotation due to overload or sudden speed change, and the detection is specifically based on the number of output pulses of the first encoder 132. This is executed based on the difference between the output pulse number of the first encoder 132 and the target value corresponding to the control pulse number for controlling the first drive motor 131.

The first rotation amount detector 139 is incorporated in the second control device 138. The first rotation amount detector 139 is configured to detect the rotation amount of the second drive motor 136 based on the output pulse of the second encoder 137, and detects the presence or absence of rotation of the second drive motor 136. It is possible.

The paper position detector 149 is arranged in the vicinity of the third transport roller 140, and is configured to detect the position of the rear end of the paper P passing through the third transport roller 140.

The first control device 133 is configured to re-drive the first drive motor 131 after the step-out of the first drive motor 131 is detected by the first step-out detector 134.

When the step-out of the first drive motor 131 is detected by the first step-out detector 134, the second control device 138 stops the drive of the second drive motor 136 in a rotatable state, and then stops the drive of the second drive motor 136 in a rotatable state, and then the first drive When the first rotation amount detector 139 detects that the second drive motor 136 is rotating in response to the transfer of the paper P due to the re-drive of the motor 131, the second drive motor 136 is re-driven. It is configured to drive. The rotatable state of the second drive motor 136 is achieved by making it a non-excited state.

That is, when the paper P is transported to both the first transport roller 130 and the second transport roller 135, the transport state of the paper P is actually measured after the first drive motor 131 is stepped out (paper). (By detecting the driven rotation of the second drive motor 136, which means that the deflection of P is eliminated), the second drive motor 136 is redriven. As a result, the paper P is accurately conveyed in a state where the first drive motor 131 does not step out again and there is no deflection. Therefore, when the stepped-out first drive motor 131 is re-driven, it is possible to carry the paper P without re-stepping out and without causing wrinkles on the paper P.

The first control device 133 and the second control device 138 are configured so that the transport speeds of the first drive motor 131 and the second drive motor 136 can be switched from the second transport speed to the first transport speed. .. The first transfer speed is a normal transfer speed before stopping the drive of the first drive motor 131 (before step-out), and the second transfer speed is slower than the first transfer speed and does not cause step-out. Is.

When the step-out of the first drive motor 131 is detected, the third control device 143 stops driving the third drive motor 141, and after the second drive motor 136 is redriven, the third drive motor 141 Is configured to redrive. At this time, the third control device 143 drives the third drive motor 141 at a second transport speed slower than the first transport speed before stopping the drive of the third drive motor 141, and is transporting at the second transport speed. When the paper position detector 149 detects that the rear end of the paper P has passed through the third transport roller 140, the third drive motor 141 is driven at the first transport speed.

When the step-out of the first drive motor 131 is detected, the fourth control device 148 stops the drive of the fourth drive motor 146, and after the third drive motor 141 is redriven, the fourth drive motor 146 Is configured to redrive. At this time, the fourth control device 148 uses the fourth drive motor when the paper position detector 149 detects that the rear end of the paper P being conveyed at the second transfer speed has passed through the third transfer roller 140. Redrive the 146.

Next, the re-driving conditions of the second drive motor will be described in detail.

FIG. 4 is a chart for explaining the re-driving condition of the second drive motor shown in FIG.

The second drive motor 136 is re-driven when the driven rotation of the second drive motor 136 is detected by the first rotation amount detector 139 after the step-out first drive motor 131 is re-driven. The driven rotation is determined based on the output pulse of the second encoder 137 provided in the second drive motor 136.

At this time, the number of output pulses of the second encoder 137 when the second drive motor 136 is rotated once is preferably larger than the number of control pulses for rotating the first drive motor 131 once. As a result, it is possible to prevent the detection of the driven rotation of the second drive motor 136 from being delayed, and to prevent the re-stepping of the first drive motor 131 from occurring due to the increase in the amount of paper tension. Is possible.

On the other hand, when increasing the number of output pulses of the second encoder 137, the first rotation amount detector 139 outputs an output pulse generated based on a disturbance such as a minute vibration by the driven rotation of the second drive motor 136. If this is the case, there is a risk of erroneous recognition. Therefore, it is preferable that the determination that the second drive motor is driven to rotate is based on the number of output pulses of the second encoder 137 exceeding a predetermined value. That is, the predetermined value is a threshold value that can remove the noise component based on the assumed disturbance (set to a value larger than the number of output pulses corresponding to the disturbance). In the present embodiment, the predetermined value is set to "9".

For example, as shown in FIG. 4, when the detuned first drive motor 131 is redriven, the control pulses output from the first control device are sequentially input to the first drive motor 131. At that time, the first encoder 132 provided in the first drive motor 131 emits the number of output pulses corresponding to the control pulses. At this time, the second encoder 137 emits the number of output pulses (-3 to 2) based on the disturbance, but since it is smaller than the predetermined value "9", the second drive motor 136 is driven by the first rotation amount detector 139. Judge that it is not rotating.

When the number of output pulses exceeds a predetermined value, the first rotation amount detector 139 determines that the second drive motor 136 is driven to rotate, and the control pulse output from the second control device 138 is the second. The two drive motors 136 are sequentially input, and the second drive motor 136 is redriven. Then, the second encoder 137 provided in the second drive motor 136 emits the number of output pulses corresponding to the control pulses input to the second drive motor 136.

Next, the operation of the paper transport device will be described in detail.

5 is a flowchart for explaining the operation of the paper transport device. FIG. 6A, FIG. 6B, FIG. 6C, FIG. 6D, FIG. 6E and FIG. 6F are steps S10, S11, S12 and S12 shown in FIG. It is the schematic for demonstrating S14, step S15 and step S18. The algorithm shown by the flowchart shown in FIG. 5 is stored in the storage unit 115 as the paper transport device control program 116.

First, during the transfer of the paper P, it is determined at a predetermined cycle whether or not the first drive motor 131 adjacent to the paper reversing portion 150 is out of step (step S10). If no step-out is detected (step S10: NO), the process ends. As described above, step-out detection is the difference between the number of output pulses of the first encoder 132 and the target value of the number of output pulses of the first encoder 132 corresponding to the number of control pulses for controlling the first drive motor 131. Based on, it is executed.

When step-out of the first drive motor 131 is detected as shown in FIG. 6A (step S10: YES), the second to fourth drive motors 136, 141, 146 are stopped as shown in FIG. 6B. (Step S11). At this time, since time elapses from the step-out of the first drive motor 131 to the stop of the second to fourth drive motors 136, 141, 146, the paper P is bent. In addition, the deflection may be larger or smaller than expected due to the influence of the slip of the paper P.

After that, as shown in FIG. 6C, the first drive motor 131 is re-driven at the second transfer speed, and the transfer of the paper P is restarted, whereby the deflection is gradually eliminated (reduced) (step S12). ). The second transport speed is a speed at which step-out does not occur, and is slower than the first transport speed (normal transport speed) before stopping the drive of the first drive motor 131 (before step-out). ..

Then, based on the number of output pulses of the second encoder 137, the presence or absence of driven rotation of the second drive motor 136 is determined (step S13).

When the driven rotation of the second drive motor 136 is detected based on the fact that the number of output pulses of the second encoder 137 exceeds a predetermined value (the deflection of the paper P is eliminated) (step S13: YES), FIG. As shown in 6D, the second drive motor 136 is redriven at the second transport speed (step S14). As described above, the predetermined value is a threshold value used to avoid erroneous recognition of the driven rotation due to disturbance such as minute vibration. Then, as shown in FIG. 6E, the third drive motor 141 is redriven at the second transfer speed (step S15).

After that, whether or not the rear end of the paper P conveyed by the first to third transfer rollers 130, 135, 140 (first to third drive motors 131, 136, 141) has passed through the third transfer roller 140. Is determined (step S16).

When the paper position detector 149 detects that the rear end of the paper P has passed through the third transport roller 140 (step S16: YES), the speeds of the first to third drive motors 131, 136, 141 are increased. The second transport speed is switched to the first transport speed (step S17), and then the fourth drive motor 146 is redriven at the second transport speed (step S18), as shown in FIG. 6F.

After that, when a predetermined time elapses (step S19: YES), the speed of the fourth drive motor 146 is switched from the second transport speed to the first transport speed (step S20), and the process ends.

Next, Modifications 1 to 6 according to the embodiment of the present invention will be described in sequence.

7 and 8 are schematic views and flowcharts for explaining a modification 1 according to the embodiment of the present invention.

The paper transport device 125 is not limited to a form having four transport rollers arranged along the paper transport path, and may have two transport rollers as in the paper transport device 125A shown in FIG. 7, for example. It is possible.

Specifically, the paper transport device 125A includes first and second drive motors 131, 136, first and second encoders 132, 137, first and second control devices 133, 138, and first step-out detector 134. , The first rotation amount detector 139, and the first and second transfer rollers 130 and 135 described above.

As shown in FIG. 8, the operation of the paper transport device 125A first determines whether or not the first drive motor 131 adjacent to the paper reversing portion 150 is out of step at a predetermined cycle during the transport of the paper P ( Step S30). If no step-out is detected (step S30: NO), the process ends.

When step-out of the first drive motor 131 is detected based on the number of output pulses of the first encoder 132 (step S30: YES) (see FIG. 5A), the second drive motor 136 is stopped (step S31) (step S31). See FIG. 5B). At this time, since time elapses from the step-out of the first drive motor 131 to the stop of the second drive motor 136, the paper P is bent.

After that, the first drive motor 131 is re-driven at the second transfer speed, and the transfer of the paper P is restarted, whereby the deflection is gradually eliminated (reduced) (step S32) (see FIG. 5C). Then, it is determined whether or not the second drive motor 136 is driven to rotate (step S33).

When the driven rotation of the second drive motor 136 is detected based on the fact that the number of output pulses of the second encoder 137 exceeds a predetermined value (the deflection of the paper P is eliminated) (step S33: YES), the second The second drive motor 136 is redriven at two transport speeds (step S34) (see FIG. 5D).

After that, when a predetermined time elapses (step S35: YES), the speeds of the first and second drive motors 131 and 136 are switched from the second transport speed to the first transport speed (step S36), and the process ends.

9 to 11 are schematic views for explaining the modified examples 2 to 4 according to the embodiment of the present invention.

The first step-out detector 134 and the first rotation amount detector 139 are not limited to the forms incorporated in the first control device 133 and the second control device 138, respectively. For example, the first step-out detector 134 and the first rotation amount detector 139 may be incorporated into the first drive motor 131 and the second drive motor 136, respectively, as in the paper transport device 125B shown in FIG. Like the paper transport device 125C shown in FIG. 11, it can be incorporated in the control unit 110, or it can be independently provided like the paper transport device 125D shown in FIG.

FIG. 12 is a schematic view for explaining a modified example 5 according to the embodiment of the present invention.

The paper transport device is not limited to a form having independent first to fourth control devices 133, 138, 143, 148. For example, as in the paper transport device 125E shown in FIG. 12, the functions of the first to fourth control devices 133, 138, 143, 148 are given to the control unit 110, and the first to fourth drive motors 131, 136, It is also possible to configure 141 and 146 to be directly controlled by the control unit 110. In this case, the control unit 110 includes the first step-out detector 134 and the first rotation amount detector 139.

FIG. 13 is a schematic view for explaining a modification 6 according to the embodiment of the present invention.

The detection of step-out is not limited to the form targeting the first drive motor 131. For example, as in the paper transport device 125F shown in FIG. 13, it is possible to configure the second drive motor 136 to detect step-out. In this case, the paper transport device 125E is the second step-out detector. It further has 139A, a third encoder 142 and a second rotation amount detector 144.

The second step-out detector 139A is incorporated in the second control device 138 and is configured to detect the step-out of the second drive motor 136 based on the number of output pulses of the second encoder 137. The third encoder 142 is provided in the third drive motor 141. The second rotation amount detector 144 is incorporated in the third control device 143 and is configured to detect the rotation amount of the third drive motor 141 based on the number of output pulses of the third encoder 142. The third drive motor 141 is rotatably configured in a state where the drive is stopped by the third control device 143.

The second control device 138 is configured to re-drive the second drive motor 136 after the step-out of the second drive motor 136 is detected by the second step-out detector 139A. When the step-out of the second drive motor 136 is detected by the second step-out detector 139A, the third control device 143 stops the drive of the third drive motor 141, and then the second drive motor 136 is re-driven. When it is detected by the second rotation amount detector 144 that the third drive motor 141 is rotating in response to the transportation of the paper P, the third drive motor 141 is re-driven. Has been done.

That is, the operation of the second control device 138 and the third control device 143 when the second drive motor 136 is stepped out is the operation of the first control device 133 and the second control device when the first drive motor 131 is stepped out. It is almost the same as the operation of 138.

As described above, in the paper transport device and the post-processing device according to the embodiment of the present invention, after the first drive motor is stepped out, the first drive motor is re-driven to drive the paper transport. Then, when it is detected that the second drive motor is rotating, the second drive motor is redriven. That is, the second drive motor is re-driven by actually measuring the conveyed state of the paper (by detecting the driven rotation of the second drive motor, which means that the deflection of the paper is eliminated). Paper is accurately conveyed without the drive motor re-stepping out and without deflection. Therefore, it is possible to provide a paper transport device and a post-processing device capable of transporting paper without retuning and without causing wrinkles on the paper when the first drive motor that has been detuned is redriven.

The paper transport device is not limited to the form applied to the post-processing device, and can be applied to, for example, an image forming device. Further, the paper transport device is not limited to a form located on the downstream side of the paper transport path from the paper reversing portion.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims. For example, the aftertreatment device is not limited to the above configuration, and includes a square fold processing unit that executes a square fold process (square spine process) for shaping the spine cover portion of the bound paper bundle, and a top and bottom of the saddle stitched paper bundle. Top and bottom cutting processing part for cutting, Z-fold processing part that bends the paper twice in a Z shape when viewed from the extension line direction of the fold, hole processing part that makes holes for filing at the edge of the paper, paper bundle It is also possible to appropriately incorporate a flat binding processing unit or the like that fastens with a staple needle with a binding margin of about 5 mm from the end.

10 Image formation system,
20 Image forming device,
100 aftertreatment device,
110 control unit,
115 storage,
116 Paper Conveyor Control Program,
120 Paper loading section,
125, 125A-125F Paper Conveyor,
130 1st transport roller,
131 1st drive motor,
132 1st encoder,
133 First controller,
134 1st step-out detector,
135 Second transport roller,
136 2nd drive motor,
137 Second encoder,
138 Second controller,
139 First rotation amount detector,
139A 2nd step-out detector,
140 Third transport roller,
141 3rd drive motor,
142 Third encoder,
143 Third controller,
144 Second rotation amount detector,
145 4th transport roller,
146 4th drive motor,
148 4th controller,
149 Paper Position Detector,
150 paper reversing part,
152 Standby,
160 middle fold,
161 and 162 rollers,
163 projecting member,
165 Saddle stitching part,
166 saddle,
167 Needle receiving mechanism,
168 Needle striking mechanism,
169 staples,
170 Paper bundle transport section,
171 and 172 arms,
175 Cutting Department,
180 Cutting waste storage,
185 Paper ejector,
187 Paper output tray,
190 communication interface,
P paper,
PB paper bundle.

Claims (12)

The first and second drive motors, which are arranged along the paper transport path and drive the first and second transport rollers for transporting the paper, respectively.
The first and second control devices that control the first and second drive motors, respectively,
It has a first rotation amount detector that detects the rotation of the second drive motor, and
The first drive motor comprises a stepping motor.
The first transport roller is located on the downstream side of the paper transport path from the second transport roller.
The first control device is configured to redrive the first drive motor after the stop of the first drive motor is detected.
The second control device is
When the stop of the first drive motor is detected, the drive of the second drive motor is stopped in a rotatable state, and then the first drive motor is re-driven to drive the paper to be conveyed. When it is detected by the first rotation amount detector that the second drive motor is rotating, the second drive motor is configured to be re-driven .
Further having a second encoder provided in the second drive motor,
The first rotation amount detector detects the rotation amount of the second drive motor based on the number of output pulses of the second encoder.
A paper transport device characterized in that the number of output pulses of the second encoder when the second drive motor is rotated once is larger than the number of control pulses for rotating the first drive motor once. The paper transport device according to claim 1, further comprising a first step-out detector that detects the stoppage of the first drive motor by detecting the step-out of the first drive motor. Further having a first encoder provided in the first drive motor,
The paper transport device according to claim 2, wherein the first step-out detector detects step-out of the first drive motor based on the number of output pulses of the first encoder. The first step-out detector is based on the difference between the number of output pulses of the first encoder and the target value of the number of output pulses of the first encoder corresponding to the number of control pulses for controlling the first drive motor. The paper transport device according to claim 3, further comprising detecting step-out of the first drive motor. Any of claims 1 to 4, wherein the first rotation amount detector determines that the second drive motor is rotating when the number of output pulses of the second encoder exceeds a predetermined value. The paper transport device according to item 1. The first and second drive motors, which are arranged along the paper transport path and drive the first and second transport rollers for transporting the paper, respectively.
The first and second control devices that control the first and second drive motors, respectively,
It has a first rotation amount detector that detects the rotation of the second drive motor, and
The first drive motor comprises a stepping motor.
The first transport roller is located on the downstream side of the paper transport path from the second transport roller.
The first control device is configured to redrive the first drive motor after the stop of the first drive motor is detected.
The second control device is
When the stop of the first drive motor is detected, the drive of the second drive motor is stopped in a rotatable state, and then the first drive motor is re-driven to drive the paper to be conveyed. When it is detected by the first rotation amount detector that the second drive motor is rotating, the second drive motor is configured to be re-driven .
A third and fourth drive motor, which is arranged along the paper transport path and drives the third and fourth transport rollers for transporting paper, respectively.
Further having a third and fourth control device for controlling the third and fourth drive motors, respectively.
The third transfer roller is located on the upstream side of the paper transfer path from the second transfer roller, and the fourth transfer roller is located on the upstream side of the paper transfer path from the third transfer roller.
When the stop of the first drive motor is detected, the third control device stops the drive of the third drive motor, and after the second drive motor is redriven, the third drive motor is turned on. Configured to redrive,
When the stop of the first drive motor is detected, the fourth control device stops the drive of the fourth drive motor, and after the third drive motor is redriven, the fourth drive motor is turned on. A paper transfer device characterized in that it is configured to be redriven. Further having a paper position detector for detecting the position of the rear end of the paper passing through the third transport roller in the paper transport path.
The third control device is
When the third drive motor is re-driven, the third drive motor is driven at a second transfer speed slower than the first transfer speed before stopping the drive of the third drive motor.
When the paper position detector detects that the rear end of the paper being conveyed at the second transfer speed has passed through the third transfer roller, the third drive motor is driven at the first transfer speed. Configured to
The fourth control device is
When the paper position detector detects that the rear end of the paper being conveyed at the second transfer speed has passed through the third transfer roller, the fourth drive motor is configured to be re-driven. The paper transport device according to claim 6 , wherein the paper transport device is characterized by the above. The paper transport device according to any one of claims 1 to 7 , wherein the second drive motor is a stepping motor. A third drive motor that is arranged upstream of the second transfer roller along the paper transfer path and drives the third transfer roller that conveys the paper.
A third control device that controls the third drive motor,
It has a second rotation amount detector that detects the rotation of the third drive motor, and has.
The second drive motor comprises a stepping motor.
The second control device is configured to redrive the second drive motor after the stop of the second drive motor is detected.
The third control device is
When the stop of the second drive motor is detected, the drive of the third drive motor is stopped in a rotatable state, and then the second drive motor is re-driven to drive the paper to be conveyed. Claims 1 to 1, characterized in that the third drive motor is configured to redrive the third drive motor when it is detected by the second rotation amount detector that the third drive motor is rotating. The paper transport device according to any one of 5. A post-processing device comprising the paper transport device according to any one of claims 1 to 9. The post-processing device according to claim 10 , further comprising a processing unit that executes a process of generating an impact load on the paper transported by the paper transport device. The post-processing apparatus according to claim 11 , wherein the process comprises a process of reversing the paper.

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