JP6958310B2 - Post-processing device and post-processing device control method - Google Patents

Description

The present invention relates to a post-processing device and a post-processing device control method capable of appropriately performing cutting at the time of bookbinding as post-processing of paper on which an image is formed.

By connecting various post-processing devices in the image forming apparatus, various bookbinding processes can be performed and the image forming apparatus can be used as a printing apparatus. As this post-processing device, a cutting function for cutting a small edge portion of a bundle of paper is known.
When performing such cutting, as shown in FIG. 14, the paper bundle p is fixed to the receiving tree a and the receiving tree facing surface b while pressing, and the receiving tree facing surface b side which is the opposite surface of the receiving tree is fixed. The cutting blade c is moved toward the edge portion of the paper bundle p to perform edge cutting. At this time, in order to cut all the paper of the paper bundle p accurately and surely, the tip of the cutting blade c is made to bite into the receiving tree a. For this reason, the receiving tree a is also called a "blade receiving portion".

Here, in order to maintain the quality of small-lot cutting at a certain level, a mechanism is known in which when the number of times of cutting execution reaches a predetermined value, the receiving tree a is shifted from the place where it has been cut and the cutting blade c is received at a different position. ing.
In this case, a drive source such as a stepping motor is used to drive the receiving tree by a predetermined amount at a predetermined timing. During cutting, the receiving tree is restrained (locked) so that the receiving tree does not shift, and when driving, the receiving tree is unlocked with the stepping motor excited and the receiving tree is sent. Then, when a predetermined amount of the receiving tree is sent from the initial position, it cannot be driven any more mechanically and is replaced at the end of its life. By adopting a stepping motor as the drive source of this drive mechanism, it is possible to feed the receiving tree with high accuracy.

However, it was found that the receiving tree may reach the end of its life earlier than usual, even though the stepping motor is used to drive the receiving tree accurately. The cause is that the receiving tree gradually shifts during cutting. As shown in FIG. 14, the cutting blade c has a vertical blade surface on the edge side of the paper bundle p and a rake surface on the opposite side. Then, when the cutting blade c having the rake face bites into the receiving tree a, the force N having the components of Nsinθ and Ncosθ acts on the receiving tree. Here, it was found that the receiving tree a gradually moves (shifts) due to the component of Ncos θ each time the cutting is performed.

In addition, another reason for the cause of the receiving tree a gradually moving and shifting is shown below. Here, the main part of the cutting device is shown in FIG. Here, at the time of cutting, a force F1 for crimping the receiving tree a toward the facing surface b of the receiving tree is generated by the press device ps. In this case, since there is no support for the receiving tree facing surface b, the press device ps falls so as to rotate in the direction of F2. As a result, a force acts in the direction of F3 on the press plate on the back surface of the receiving tree a. Here, since the receiving tree a is crimped to the paper bundle p, the force of F4 acts on the receiving tree a relative to the press plate on the back surface of the receiving tree a, and the receiving tree a becomes minute. It turned out to be off.

Normally, the direction of drive transmission is [stepping motor] → [stepping motor], but when the receiving tree moves and shifts as described above, position control is performed like [stepping motor] → [stepping motor]. It may flow back. At this time, if the step angle of the stepping motor is deviated by more than half due to the backflow, the step forward is advanced by one step at the time of pre-excitation.

As a result, the start point at the time of the next drive shifts in the direction of advancing by one step, and the shift amount is added to the final drive amount. For example, as shown by the solid line in FIG. 16, every time the cutting is repeated several thousand times as shown on the horizontal axis, the receiving tree is driven by a predetermined amount as shown on the vertical axis. In this case, it is assumed that the life of the receiving tree is reached as described above when the limit of the driving amount of the receiving tree is reached (the number of cutting executions: max).

However, when the movement of the receiving tree flows backward and the step of the stepping motor shifts, the receiving tree is driven in a state where the step is slightly advanced each time as shown by the broken line in FIG. Therefore, the limit of the driving amount of the receiving tree is reached when the number of cutting executions: max'is less than the original number of cutting executions: max'.

The above description is for the case where the movement due to the backflow from the receiving tree and the driving of the receiving tree are in the same direction. On the other hand, when the movement of the receiving tree is in the direction opposite to the driving direction of the receiving tree, as shown by the alternate long and short dash line in FIG. The amount is added to the final drive amount and is lost. For example, as shown in the two-point chain line of FIG. 16, the driving cannot be sufficiently performed as compared with the solid line. That is, even though the stepping motor is used, it becomes impossible to drive the receiving tree accurately, which may affect the quality of cutting.

Regarding the driving of the receiving tree, it is considered that accurate driving of the receiving tree can be realized by mounting an encoder or a sensor on the receiving tree side to detect the actual driving amount and feeding it back to the driving source side. However, such a configuration causes problems such as cost increase due to an increase in the number of parts and a need for a new configuration and control such as calibration control.

Various proposals have been made in the following patent documents in relation to the above-mentioned drive and position control.

JP-A-2017-123775 Japanese Unexamined Patent Publication No. 2014-225964 Japanese Unexamined Patent Publication No. 2008-8728 Japanese Unexamined Patent Publication No. 2003-202727

In Patent Document 1 described above, when a rotor as a drive source and a detection rotor for detecting the rotation position of the rotor via a rotation drive mechanism are provided, the rotor is inverted by providing a play in the rotation drive mechanism. However, the inversion is not transmitted to the detection rotor.
In Patent Document 2 described above, a protrusion and a ratchet are provided so that the stepping motor does not reverse.

In Patent Document 3 described above, the backlash of the drive gear is returned and the stepping motor is stopped so that the pointer can indicate "0" on the display plate.
In Patent Document 4 described above, by providing a play in the drive gear to serve as a driving force idle portion, it is possible to transmit rotation in a stable rising state after issuing an instruction.

In any of the above patent documents, the moving force of the driving object flows back to the stopped driving source side, and the moving force from the backflowing driving object gradually acts on the driving source. No issue has been pointed out about the problem that the drive source cannot drive the drive object correctly.

In addition, if some kind of play is provided in the middle of the drive transmission system, a new problem is expected that it becomes difficult to accurately execute the original drive.
The present invention has been made in view of such a problem, and solves the problem that the moving force on the driving object side flows back to the driving source side without mounting an encoder or a sensor on the driving object. An object of the present invention is to provide a post-processing device and a post-processing device control method capable of accurately driving an object to be driven.

That is, one aspect of the reflected post-processing device and the post-processing device control method reflecting one aspect of the present invention is configured as follows.
(1) In one aspect of the post-processing apparatus reflecting one aspect of the present invention, an object used in processing is used as a driving object, and the driving force of the driving source is transmitted to the driving object via a driving transmission system. A control unit that controls the drive source, which is a post-processing device that drives the drive object in a predetermined direction in relation to the process and causes the drive object to move without depending on the drive force. And a drive buffer having a play in the drive direction are provided at any position of the drive transmission system, A is the drive amount in the drive buffer corresponding to the target drive amount of the drive object, and B is the drive amount. The amount of play in the drive direction in the drive buffer set to absorb the movement of the drive object, the additional drive amount to add C to the A in the drive buffer, and the drive source of the drive buffer. The control unit is driven when the side close to the input drive side is the input drive side, the side of the drive buffer unit close to the drive object is the output drive side, and the drive object can be fixed and defixed. Release the fixation of the object, drive the input drive side by A + C in the positive direction, drive the input drive side by B + C in the negative direction, fix the drive object, and adjust to the range of movement that occurs in the drive object. It is characterized in that the input drive side is driven in the positive direction in the range of B or less, and the drive source controls the input drive side of the drive buffer unit to be driven.

Further, in one aspect of the post-processing device control method reflecting one aspect of the present invention, an object used in processing is used as a driving object, and a driving force of a driving source is applied to the driving object via a driving transmission system. It is a post-processing device control method that controls a post-processing device that transmits and drives the driving object in a predetermined direction in relation to the processing and that causes movement of the driving object regardless of the driving force. The post-processing device includes a control unit that controls the drive source and a drive buffer unit that has a play in the drive direction at any position of the drive transmission system, and sets A as a target drive amount of the drive object. The drive amount in the drive buffer unit corresponding to, B is the play amount in the drive direction in the drive buffer unit set to absorb the movement of the drive object, and C is the A in the drive buffer unit. The additional drive amount to be added to, the side of the drive buffer near the drive source is the input drive side, the side of the drive buffer near the drive object is the output drive side, and the drive object is fixed and defixed. When is possible, the drive target is released, the input drive side is driven by A + C in the positive direction, the input drive side is driven by B + C in the negative direction, the drive target is fixed, and the drive target is fixed. It is characterized in that the input drive side is driven in the positive direction in the range of B or less according to the range of the movement generated in the object, and the input drive side of the drive buffer is driven by the drive source.

(2) In the above (1), the cutting blade that cuts the paper as the process and the cutting blade that receives the cutting blade through the paper when the paper is cut by the cutting blade and in a predetermined direction at a predetermined timing. It is characterized in that the blade receiving portion as the driving object to be driven is provided, and the control unit drives the blade receiving portion in a predetermined direction every time the cutting is performed a predetermined number of times.

(3) In the above (1) to (2), the drive source is a stepping motor, and the control unit drives the A, B, and C in the drive buffer. It is characterized in that the motor is driven based on the step angle.
(4) In the above (1) to (3), the stepping motor as the drive source, the cutting blade for cutting the paper as the processing, and the paper when the paper is cut by the cutting blade are used. S. When the deviation amount in the drive buffer portion is E due to the movement generated in the blade receiving portion by cutting a predetermined number of times, the play amount B, the step resolution S, and the deviation amount E are B> E-0. Each part is set so as to satisfy 5S.

(5) In the above (2), the control unit controls to drive the blade receiving unit with the side where the rake face of the cutting blade exists as the predetermined direction.
(6) In the above (2) to (5), the blade receiving portion is configured to be driven in a direction including the direction of gravity.

(7) In the above (1) to (6), when the total play amount of the drive transmission system in which the play in the drive direction of all the drive transmission systems appears in the drive buffer is F, the addition in the drive buffer. The drive amount C is set to be larger than the play amount H of the non-drive buffer portion obtained by removing the play amount B from the play amount F of the entire drive transmission system.

(8) In the above (1) to (7), the drive buffer includes a shaft, a parallel pin press-fitted into the shaft, a pulley through which the shaft rotatably penetrates the center of rotation, and the pulley. The pin groove is provided with a play in the rotation direction of the parallel pin when the parallel pin rotates about the shaft. It is characterized by.

According to one aspect of the reflected post-processing device and the post-processing device control method reflecting one aspect of the present invention, the following effects can be obtained.
(1) In one aspect of the post-processing device and the post-processing device control method reflecting one aspect of the present invention, the driving force of the drive source is transmitted to the drive object via the drive transmission system to transmit the drive object. A drive buffer having a play in the drive direction is provided at any position of the drive transmission system when the object to be driven moves in a predetermined direction in connection with the processing and the object is moved regardless of the driving force. Is the amount of drive in the drive buffer corresponding to the target drive amount of the drive object, B is the amount of play in the drive direction set to absorb the movement of the drive object, and C is the drive buffer. The additional drive amount added to A in the above, the side of the drive buffer near the drive source is the input drive side, the side of the drive buffer near the drive object is the output drive side, and the drive object can be fixed and defixed. , The drive target is released, the input drive side is driven by A + C in the positive direction, the input drive side is driven by B + C in the negative direction, the drive target is fixed, and the range of movement that occurs in the drive target. The input drive side is driven in the positive direction in the range of B or less in accordance with the above, and the input drive side of the drive buffer is controlled to be driven by the drive source.

Here, by driving the input drive side by A + C in the positive direction and further driving the input drive side by B + C in the negative direction, it is possible to drive the drive object accurately by A while providing play in the drive direction. can. Further, by driving the input drive side in the positive direction in the range of B or less according to the range of movement occurring in the driving object, the driving for absorbing the movement when the driving object moves occurs. A directional buffer section is created. Therefore, it is possible to solve the problem that the moving force on the driving object side flows back to the driving source side without mounting an encoder or a sensor on the driving object, and to drive the driving object accurately.

(2) In the above (1), the cutting blade that cuts the paper, the blade receiving portion as a driving object that receives the cutting blade when the paper is cut and is driven in a predetermined direction at a predetermined timing. The blade receiving portion is driven in a predetermined direction every time the cutting is performed a predetermined number of times. As a result, the blade receiving portion as the driving object can be accurately driven by A while providing play in the driving direction. Then, when a movement of movement that occurs in the blade receiving portion occurs, a buffer section in the driving direction for absorbing the movement is generated. Therefore, without mounting an encoder or a sensor on the blade receiving portion, the problem that the moving force of the blade receiving portion flows back to the drive source side can be solved, and the blade receiving portion can be driven accurately.

(3) In the above (1) to (2), the drive source is a stepping motor, and the stepping motor is driven based on the step angle so as to drive A, B, and C in the drive buffer. It is possible to accurately drive the driving object while providing play in the driving direction, and to generate a buffer section in the driving direction to absorb the movement of the driving object when the movement of the driving object occurs. Therefore, it is possible to solve the problem that the moving force on the driving object side flows back to the driving source side without mounting an encoder or a sensor on the driving object, and to drive the driving object accurately.

(4) In the above (1) to (3), the value obtained by converting the one-step resolution of the stepping motor by the drive buffer is S, and the amount of deviation in the drive buffer due to the movement generated in the blade receiving portion by cutting a predetermined number of times is calculated. In the case of E, each part is set so as to satisfy B> E-0.5S with respect to the play amount B, the step resolution S, and the deviation amount E. As a result, the movement of the blade receiving portion transmitted to the stepping motor becomes less than half of the one-step resolution in a predetermined number of cutting periods. Therefore, there is no error in advance or delay when the stepping motor is driven. Therefore, it is possible to solve the problem that the moving force on the driving object side flows back to the driving source side without mounting an encoder or a sensor on the driving object, and to drive the driving object accurately.

(5) In the above (2), the blade receiving portion is driven with the side where the rake face of the cutting blade exists as a predetermined direction. In this case, the movement of the blade receiving portion caused by the execution of cutting and the driving of the blade receiving portion by the drive source are in the same direction, and the problem that the moving force on the drive object side flows back to the drive source side can be easily solved. , It becomes possible to drive the driving object accurately.

(6) In the above (2) to (5), it is configured to be driven in a direction including the direction of gravity. In this case, the movement of the blade receiving portion and the driving of the blade receiving portion by the driving source tend to be in the same direction, and the problem that the moving force on the driving object side flows back to the driving source side is easily solved, and the driving object is driven. Can be driven accurately.

(7) In the above (1) to (6), when the total play amount of the drive transmission system in which the play in the drive direction of all the drive transmission systems appears in the drive buffer section is F, the additional drive amount C in the drive buffer section. Is set to be larger than the play amount H of the non-drive buffer portion obtained by removing the play amount B from the play amount F of the entire drive transmission system, so that the drive buffer unit provides play in the drive direction and drives. Even when other play components are present in the entire transmission system, the driving object can be driven exactly by A. Therefore, the problem that the moving force on the drive target side flows back to the drive source side can be solved, and the drive target can be driven accurately.

(8) In the above (1) to (7), the drive buffer portion is formed by the parallel pins and the pin grooves having a margin in the rotation direction. As a result, it is possible to solve the problem that the moving force on the driving object side flows back to the driving source side without mounting an encoder or a sensor on the driving object, and to drive the driving object accurately.

It is a block diagram which shows the structure of the post-processing apparatus of embodiment of this invention. It is a block diagram which shows the structure of the image formation system which includes the post-processing apparatus of embodiment of this invention. It is a block diagram which shows the structure of the main part of the Embodiment of this invention. It is a block diagram which shows the structure of the main part of the Embodiment of this invention. It is a block diagram which shows the structure of the main part of the Embodiment of this invention. It is a block diagram which shows the structure of the main part of the Embodiment of this invention. It is a block diagram which shows the structure of the main part of the Embodiment of this invention. It is a block diagram which shows the structure of the main part of the Embodiment of this invention. It is a block diagram which shows the structure of the main part of the Embodiment of this invention. It is a flowchart which shows the basic operation of the post-processing apparatus of embodiment of this invention. It is explanatory drawing which shows the operation state of embodiment of this invention. It is explanatory drawing which shows the operation state of embodiment of this invention. It is explanatory drawing which shows the specific example of embodiment of this invention. It is explanatory drawing which shows the operation of the conventional post-processing apparatus. It is explanatory drawing which shows the operation of the conventional post-processing apparatus. It is explanatory drawing which shows the operation of the conventional post-processing apparatus.

Hereinafter, embodiments for carrying out the present invention (hereinafter, embodiments) will be described in detail with reference to the drawings.
[Configuration of image formation system]
First, with respect to the post-processing apparatus of the present embodiment, a schematic configuration of an image forming system having the post-processing apparatus will be described first. As shown in FIG. 2, this image forming system includes an image forming device 10, a post-processing device 20, a post-processing device 30, and a post-processing device 40. The post-processing device of the present embodiment corresponds to the post-processing device 30 having a cutting portion described later.

The image forming apparatus 10 includes an image forming unit 15 that executes image forming (printing) based on an image forming command and image data. The paper on which the image is formed by the image forming apparatus 10 is carried out toward the post-processing apparatus 20 in the subsequent stage.
The post-processing device 20 is connected to the subsequent stage of the image forming device 10, and includes an inversion unit 22 for reversing the paper from the image forming device 10 and a matching unit 23 for matching the inverted paper. NS.

The post-processing device 30 is connected to the subsequent stage of the post-processing device 20, and has a folding portion 32 that folds the paper in a saddle stitch or a tri-fold, and a stacking portion 33 that stacks the paper for paper processing to form a bundle of paper. Saddle stitching portion 34, which performs saddle stitching on the paper folded by the folding portion 32, and flattening processing, which flattens the spine-folded portion of the paper bundle in which the creases for saddle stitching are formed, are performed. It is configured to include a processing unit 35, a cutting unit 36 for cutting the edge portion of the saddle-stitched paper bundle, and a discharge unit 39 for discharging the saddle-stitched or middle-folded paper bundle.

The post-processing device 40 is connected to the subsequent stage of the post-processing device 30, and includes a main tray ejection unit 44 that ejects paper with the main tray as the ejection destination, and a sub tray ejection unit 45 that ejects paper with the sub tray as the ejection destination. Is configured with.
In this image forming system, when the paper conveyed from the image forming apparatus 10 in the X direction is processed by the post-processing apparatus 40, the paper processing is executed and ejected while being conveyed in the X direction as it is. ..

On the other hand, when the post-processing apparatus 30 executes paper processing for creating a booklet, the folding portion 32 is folded in the middle with the Y direction as the ridgeline, and while being conveyed in the Y direction, the overlapping portion 33 and the saddle stitching portion 34 By performing saddle stitching while superimposing the sheets in the above direction, and further performing a flattening process for flattening the spine cover portion by the roller 35R at the flattening processing unit 35 by transporting the paper in the Y direction, the execution efficiency of the paper processing can be improved. This will increase and make it possible to increase productivity as an image formation system. Then, the flattened paper bundle is conveyed in the −X direction and the −Z direction, the edge portion is cut by the cutting portion 36, and then the edge portion is conveyed in the Z direction, and the X is conveyed by the discharge roller 39r and the discharge belt 39b. It is discharged in the direction.

Further, the connection of the image forming apparatus 10, the post-processing apparatus 20, the after-processing apparatus 30, and the after-processing apparatus 40 is an example of an image forming system, and is not limited to such a connection. Further, the post-processing device may be referred to as an intermediate processing device or a post-processing device.
[Configuration of aftertreatment device]
The configuration of the above post-processing device 30 will be described with reference to FIGS. 1 and 3 and subsequent sections. Here, an object used in the post-processing is used as a driving object, and the driving force of the driving source is transmitted to the driving object via the driving transmission system to move the driving object in a predetermined direction in relation to the processing. A post-processing device that drives and causes movement of the driven object without depending on the driving force will be described.

The post-processing device 30 includes a control unit 101, a motor drive unit 105, a motor 110, a pulley 115, a belt 120, a pulley 130, a pin groove 135, a parallel pin 140, a shaft 150, a pinion 160, a rack 170, a blade receiving unit 180, and a cutting unit. It is configured to include a blade driving unit 191 and a cutting blade 195. Here, pulleys 115 to rack 170 form a drive transmission system.

Hereinafter, FIGS. 3 and 4 will also be referred to. The control unit 101 controls the drive of the blade receiving unit 180 as a drive object using the motor 110, which is a stepping motor, as a drive source. A pulley 115 is attached to the rotating shaft 111 of the motor 110. The shaft 150 penetrates through the center hole of another pulley 130. A belt 120 is wound around the pulley 115 and the pulley 130. The pulley 130 is provided with a pin groove 135 having a play in the rotation driving direction for parallel pins. The parallel pin 140 is attached in a direction perpendicular to the axial direction of the shaft 150, and the parallel pin 140 is fitted in the pin groove 135. Pinions 160 are attached to other positions on the shaft 150. A rack 170 is provided at a position where it meshes with the pinion 160. A blade receiving portion 180 as a drive object is attached to the rack 170 via an attachment portion 175. Further, a facing surface 190 is provided at a position facing the blade receiving portion 180, and the paper bundle p is fixed while being pressed by the blade receiving portion 180 and the facing surface 190.

Then, at the time of cutting, as shown in FIG. 5, the cutting blade 195 is moved from the facing surface 190 side opposite to the blade receiving portion 180 toward the edge portion of the paper bundle p to perform edge cutting. The tip of the cutting blade 195 is controlled to bite into the blade receiving portion 180 for reliable cutting execution.

A known mechanism can be used for the pressure-applying portion when the paper bundle p is pressed between the blade receiving portion 180 and the facing surface 190. For example, as shown in FIG. 6 showing an XY plane, guide axes G1 and G2 in the X direction are provided between the frames FL, and the movable portion P1 is configured to be movable in the X direction along the guide axes G1 and G2. There is. The blade receiving portion 180 is attached to the movable portion P1 via the attachment portion 175. An facing surface 190 is attached to the frame FL on the opposite surface. Here, ball screws B1 and B2 are provided in parallel with the guide shafts G1 and G2. The movable portion P1 is provided with nuts N1 and N2 corresponding to the guide shafts G1 and G2. When the ball screws B1 and B2 are rotated by a motor (not shown), the movable portion P1 moves in the X direction. Then, the paper bundle p to be inserted into the cutting frontage is pressed.

Further, as shown in FIG. 7A, pressure is applied to the blade receiving portion 180 and the mounting portion 175 at the holding portions 171 and 172, 173, and the mounting portion 175 and the blade receiving portion 180 are fixed to each other (as shown in FIG. 7A). Normal state). Further, as shown in FIG. 7B, in the holding portions 171 and 172, 173, the pressure on the blade receiving portion 180 and the mounting portion 175 is released, and the mounting portion 175 and the blade receiving portion 180 are released from being fixed. (Driven state). That is, the blade receiving portion 180 can be in two states: a state in which the blade receiving portion 180 is fixed to the mounting portion 175 by the holding portion and a state in which the blade receiving portion 180 is released from the mounting portion 175 by the holding portion. Then, in the state where the blade receiving portion 180 is released from being fixed, the blade receiving portion 180 can be driven by the rotational force of the motor 110. The blade receiving portion 180 is fixed by the holding portions 171, 172, and 173 at a timing other than driving the blade receiving portion 180 by the rotational force of the motor 110. The holding units 171, 172, and 173 create the above-mentioned fixed and defixed states by an actuator (not shown) or the like instructed by the control unit 101.

[Structure of drive buffer (1)]
Hereinafter, a first example of the drive buffer unit in the drive transmission system of the present embodiment will be described. The drive buffer is a portion that is provided at any position in the drive transmission system and has a play in the drive direction to absorb a moving force in the direction opposite to the drive force transmission. In the embodiment shown here, the drive direction is the rotation direction, and the play in the drive direction is the play in the rotation direction. Further, in the following description, in order to facilitate the explanation, a state in which a gap is provided extremely large between the respective parts is shown.

Here, an example of a specific example in which the drive buffer portion is realized by the pulley 130 and the parallel pin 140 will be described with reference to FIG. Here, FIGS. 8 (a), (b) and (c) show conventional pulleys and parallel pins that do not form a drive buffer, and FIGS. 8 (d), (e), (f) and (g) show the drive buffer. The pulleys and parallel pins of the present embodiment to be configured are shown.

In FIG. 8A, the pulley 130 is provided with a hole 130h for penetrating the shaft and a pin groove 135 in which parallel pins are housed in the center. In FIG. 8B, a parallel pin is press-fitted perpendicularly to the shaft 150 whose longitudinal direction is the direction perpendicular to the paper surface. In FIG. 8C, the shaft 150 penetrates through the hole 130h of the pulley 130 with the parallel pin 140 fitted in the pin groove 135. Therefore, the pulley 130 and the shaft 150 rotate equally with the shaft 150 as the central axis without play.

In FIG. 8D, the pulley 130 is provided with a hole 130h for penetrating the shaft and a pin groove 135 in which parallel pins are housed in the center. Here, when the parallel pin 140 rotates about the shaft 150, the pin groove 135 is configured with a play in the rotation direction of the parallel pin 140. That is, two fan shapes with the acute-angled portion directed to the hole 130 with the hole 130 as the center are configured as the pin groove 135.

In FIG. 8 (e), as in FIG. 8 (b), a parallel pin is press-fitted perpendicularly to the shaft 150 whose longitudinal direction is the direction perpendicular to the paper surface. In FIG. 8 (f), the shaft 150 penetrates through the hole 130h of the pulley 130 with the parallel pin 140 fitted in the pin groove 135 having play. Therefore, the pulley 130 and the shaft 150 rotate with the shaft 150 as the central axis in a state of having play in the rotation driving direction. FIG. 8 (g) shows that when the pulley 130 starts to rotate clockwise, only the pulley 130 first rotates, and with a slight delay, the parallel pin 140 and the shaft 150 rotate equally with the pulley 130. Further, when the pulley 130 starts to rotate counterclockwise from the state shown in FIGS. 8 (f) and 8 (g), only the pulley 130 first rotates, and with a slight delay, the parallel pin 140 and the shaft 150 move to the pulley 130. Will rotate equally.

That is, when the shaft 150 starts to rotate, the shaft 150 and the parallel pin 140 first rotate in the play direction, and the pulley 150 rotates equally with the shaft 130 and the parallel pin 140 with a slight delay.
[Structure of drive shock absorber (2)]
Hereinafter, a second example of the drive buffer portion in the drive transmission system of the present embodiment will be described. In the embodiment shown here, the drive direction is the rotation direction, and the play in the drive direction is the play in the rotation direction. Further, in the following description, in order to facilitate the explanation, a state in which a gap is provided extremely large between the respective parts is shown.

FIG. 9A shows a configuration using a conventional parallel key and key groove. Here, the parallel key 141 is press-fitted into the shaft 150, and the pulley 130 is provided with a key groove 136 as a recess corresponding to the parallel key 141. Therefore, the shaft 150 penetrates through the hole 130h of the pulley 130 with the parallel key 141 fitted in the key groove 136. Therefore, the pulley 130 and the shaft 150 rotate equally with the shaft 150 as the central axis without play.

FIG. 9B shows the pulley and the parallel pin of the present embodiment constituting the drive buffer. Here, the parallel key 141 is press-fitted into the shaft 150, and the pulley 130 is provided with a key groove 137 so as to have a play in the rotation driving direction with respect to the parallel key 141. Then, with the parallel key 141 fitted in the key groove 137, the shaft 150 penetrates through the hole 130h of the pulley 130. Therefore, with respect to the pulley 130 and the shaft 150, only the pulley 130 first rotates with the shaft 150 as the central axis, and with a slight delay, the parallel pin 140 and the shaft 150 rotate equally with the pulley 130.

FIG. 9C shows a configuration using a conventional D-cut shaft and D-hole. Here, the pulley 130 is provided with a D hole 131h corresponding to the shaft 150, which is partially cut by the D cut shaft 151. Therefore, the shaft 150 penetrates the pulley 130 with the D-cut shaft 151 fitted in the D hole 131h. Therefore, the pulley 130 and the shaft 150 rotate equally with the shaft 150 as the central axis without play.

FIG. 9D shows a configuration using the D-cut shaft and the D hole of the present embodiment constituting the drive buffer. A part of the shaft 150 is cut by the D-cut shaft 151. On the other hand, the pulley 130 is provided with a hole 132h in which two convex portions are provided on a straight portion of D so that the D-cut shaft 151 can rotate by a certain angle and is partially expanded. Therefore, the shaft 150 penetrates the pulley 130 with the D-cut shaft 151 fitted in the hole 132h. Therefore, with respect to the pulley 130 and the shaft 150, only the pulley 130 first rotates with the shaft 150 as the central axis, and the shaft 150 rotates equally with the pulley 130 with a slight delay.

On the contrary, when the shaft 150 starts to rotate, only the shaft 150 rotates first in the play direction, and the pulley 150 rotates equal to the shaft 130 with a slight delay.
In addition to the types shown here, the drive shock absorber has various other deformations such as gear-to-gear meshing play, rack-pinion meshing play, and belt-driven play with slack between pulleys. It is possible.

〔motion〕
Hereinafter, the basic operation of the present embodiment will be described with reference to the flowcharts of FIGS. 10 and 11 and the explanatory diagrams of FIGS. 11 and 11. The post-processing device of the present embodiment that performs cutting includes a device in which the cutting unit performs cutting in conjunction with image formation as part of the image forming system (see FIG. 2) and an image forming device that is independent of the image forming device. Either a cutting device exists and cutting is performed offline (not shown).

In the post-processing device, the control unit 101 monitors the generation of cutting instructions (steps S101 to S114 in FIG. 10), and when a cutting command is sent to the cutting unit from outside the post-processing device, the control unit 101 Each part is controlled so as to execute the following processing as a cutting instruction generation (YES in step S101 in FIG. 10). At this point, it is assumed that the blade receiving portion 180 is fixed to the fixed portion on the motor 110 to the blade receiving portion 180 side.

When the paper bundle p arrives at the cutting unit, the control unit 101 controls each unit so as to sandwich the paper bundle p between the blade receiving unit 180 and the facing surface 190, and in that state, the cutting blade is cut via the cutting blade driving unit 191. 195 is controlled to perform edge cutting of the paper bundle p (step S102 in FIG. 10).
In accordance with this cutting execution, the control unit 101 counts and stores the number of cutting executions (step S103 in FIG. 10), and the number of cutting executions reaches a predetermined predetermined number of times (for example, 700 times). It is confirmed whether or not it has been done (step S104 in FIG. 10).

In addition, when cutting is executed, the tip of the cutting blade c is made to bite into the blade receiving portion 180 in order to cut all the paper of the paper bundle p accurately and surely, so that the cutting blade 195 is formed in the blade receiving portion 180. It is necessary to shift the biting position. Therefore, the number of times of cutting that requires the position of the blade receiving portion 180 to be shifted in this way is set in advance as the "predetermined number of times". The predetermined number of times is determined in advance in consideration of the material / structure of the cutting blade 195, the material of the blade receiving portion 180, the driving amount / driving force at the time of cutting of the cutting blade 195, the paper thickness / number of pages of the paper bundle p, and the like. It is desirable to keep it. Therefore, it is also desirable to set a plurality of predetermined times according to conditions such as the paper thickness and the number of pages of the paper bundle p, and select an appropriate value.

When the control unit 101 determines that the counted number of times of cutting execution has not reached a predetermined number of times, the control unit 101 returns to the waiting for the generation of the cutting instruction (NO in step S104, NO in S114, S101 in FIG. 10). ..
On the other hand, when the control unit 101 determines that the counted number of times of cutting execution has reached a predetermined number of times (YES in step S104 in FIG. 10), the following processing related to driving the blade receiving unit 180 Is executed (steps S105 and 5 in FIG. 10).

The control unit 101 shifts the facing surface 190 to the retracted position with respect to the position of the blade receiving unit 180 by the above-mentioned press mechanism or the like (step S105 in FIG. 10). The evacuation position means a position in which various adjustments can be made by widening the cutting frontage as described above.

Further, the control unit 101 turns on the excitation of the motor 110, which is a stepping motor, by the motor drive unit 105, and holds the motor 110 so that it does not rotate (step S106 in FIG. 10). The state in which the motor 110 is held with the excitation on is continued until the next excitation is turned off.

Then, the control unit 101 releases the fixed state between the blade receiving portion 180 and the mounting portion 175 via the holding portions 171, 172, and 173, and brings the blade receiving portion 180 into a driveable state (in FIG. 10). Step S107).
Then, the control unit 101 drives the motor 110 as follows after releasing the fixed state of the blade receiving unit 180.

Here, A, B, and C are used as the drive amount in the drive buffer. In the present embodiment, since the drive buffer is driven by rotation, the drive amount means an angle, but if the drive buffer is linearly driven, the drive amount means a distance. Further, the direction in which the blade receiving portion 180 is driven is set to the positive direction and the opposite direction is set to the negative direction for each predetermined number of cuttings. In this embodiment, the clockwise direction is defined as a positive direction and the counterclockwise direction is defined as a negative direction.

and,
A is the drive amount in the drive buffer unit corresponding to the target drive amount of the blade receiving portion 180,
B is the amount of play in the drive direction in the drive buffer set to absorb the movement of the blade receiving portion 180.
C is an additional drive amount added to A in the drive buffer,
D is the amount of play in the positive direction in the drive buffer due to the movement of the blade receiving portion 180.
The input drive side is the pin groove 135 (pulley 130), which is the side of the drive buffer near the motor 110.
The output drive side is a parallel pin 140, which is a side close to the blade receiving portion 180 of the drive buffer portion.
And.

Here, the control unit 101 drives the pulley 130 having the pin groove 135 on the input drive side in the buffer drive unit in the positive direction by A + C by the rotation control of the motor 110 via the motor drive unit 105, and the excitation is turned on. It is controlled to be held in the holding state (step S108 in FIG. 10).

Here, with reference to FIG. 11, the driving state of the pulley 130, the pin groove 135 having play, and the parallel pin 140 will be specifically shown and described.
FIG. 11A shows an ideal state of the initial state before driving the receiving portion 180. Then, as described above, a moving force acts on the blade receiving portion 180 due to the action of the rake face of the cutting blade 195 at the time of cutting, and this moving force flows back through the drive transmission system. Therefore, even in the initial state before driving the receiving portion 180, the parallel pin 140 actually moves slightly in the positive direction as shown in FIG. 11B due to the moving force from the blade receiving portion 180. It may be in a state of being.

However, in the present embodiment, since the pin groove 135 is provided with a play as a buffer drive unit so as to be able to absorb this moving force, in FIG. 11B, the moving force from the blade receiving portion 180 is not applied to the pulley 130. Not working.
Then, as described above, when the pulley 130 is driven in the positive direction (FIG. 11 (c)), the pulley 130 is driven in the positive direction by A + C after passing the drive of A in the positive direction (FIG. 11 (d)). The holding state is maintained by turning on the excitation in FIG. 10 (step S108 in FIG. 10, FIG. 11 (e)). Since the pin groove 135 has a play in the present embodiment, there is no guarantee that the parallel pin 140 is A at the time when A is driven in the forward direction (FIG. 11 (d)), and the parallel pin 140 is larger than A. There is a possibility of being tall.

Here, the control unit 101 controls the rotation of the motor 110 via the motor drive unit 105 to drive the pulley 130 having the pin groove 135 on the input drive side in the buffer drive unit in the negative direction from the state of being driven by A + C to B + C. Only drive (that is, drive only − (B + C)), and control is performed so that the holding state is maintained when excitation is turned on (step S109 in FIG. 10).

That is, by driving the pulley 130 and the parallel pin 140 shown in FIG. 11 (e) by B + C in the negative direction, the state shown in FIG. 11 (f) is obtained.
In this state, since the play amount and the additional drive amount are returned after the additional drive amount is added to the desired drive amount to drive the parallel pin 140, the parallel pin 140 is reliably driven by the desired A.

Therefore, the control unit 101 controls the blade receiving unit 180 and the mounting unit 175 to return to the fixed state via the holding units 171, 172, and 173 (step S110 in FIG. 10).
Then, the control unit 101 fixes the blade receiving unit 180 by the holding units 171, 172, and 173, and then controls the rotation of the motor 110 via the motor drive unit 105 to control the pin on the input drive side in the buffer drive unit. The pulley 130 having the groove 135 is driven by D in the forward direction (step S111 in FIG. 10) and controlled to turn off the excitation of the motor (step S112 in FIG. 10). Further, the control unit 101 shifts the blade receiving unit 180 and the facing surface 190 from the retracted position to the home position (step S113 in FIG. 10). The home position is a position to wait while preparing for the next cutting. Then, the control unit 101 controls each unit so as to repeatedly execute the above operations until the job being executed is completed (step S114 in FIG. 10).

Note that D is the amount of play in the positive direction in the drive buffer portion due to the movement of the blade receiving portion 180, and D = B when the moving force from the blade receiving portion 180 is always only in the positive direction.
Therefore, as shown in FIG. 11H, the control unit 101 controls the rotation of the motor 110 via the motor drive unit 105 to move the pulley 130 having the pin groove 135 on the input drive side of the buffer drive unit in the forward direction. It is controlled to drive only B. As a result, the pin groove 135 has a play amount of + B in the positive direction with respect to the pin 140, so that the moving force from the blade receiving portion 180 can be absorbed.

On the other hand, when the moving force from the blade receiving portion 180 may be generated in both positive and negative directions such as + D1 to −D2 (however, B = D1 + D2), D = D1 is set (in FIG. 10). Step S111). That is, D1 is the amount of play in the positive direction in the drive buffer portion due to the movement of the blade receiving portion 180, and D2 is the amount of play in the negative direction in the drive buffer portion due to the movement of the blade receiving portion 180. Further, when the moving force from the blade receiving portion 180 is D1 = 0 and there is a possibility that the moving force is only D2 in the negative direction and is generated only in the negative direction, the pulley 130 is not driven in step S111. To.

Therefore, in FIG. 12, which is controlled in the same manner as in FIGS. 11 (a) to 11 (f), as shown in FIG. 12 (h), the control unit 101 buffers by controlling the rotation of the motor 110 via the motor drive unit 105. The pulley 130 having the pin groove 135 on the input drive side in the drive unit is controlled to be driven by D in the forward direction. As a result, the pin groove 135 has a play amount of D1 in the positive direction and a play amount of D2 in the negative direction with respect to the parallel pin 140, so that both the positive and negative from the blade receiving portion 180 It becomes possible to absorb the moving force.

[Other various conditions (1)]
Various conditions in the operation of the above embodiments will be described below.
S is the amount obtained by converting the one-step resolution of the motor 110, which is a stepping motor, by the drive buffer.
E is the amount of displacement that appears in the drive buffer due to the movement that occurs in the blade receiving portion 180 after cutting a predetermined number of times.
B is the amount of play in the drive direction in the drive buffer set to absorb the movement of the blade receiving portion 180.
And.

in this case,
Each part is set so as to satisfy B> E-0.5S.
Originally, it is desirable to set B ≧ E so that the amount of play can completely cover the deviation. However, by setting B> E-0.5S to reduce the play amount B, a movement amount of less than 0.5S may flow back from the blade receiving portion 180 to the motor 110, but the cutting is performed a predetermined number of times. The backflow component transmitted to the motor 110 during the period is less than half of the one-step resolution. That is, if the deviation is less than half of the one-step resolution, it returns to 0 by the pre-excitation of the stepping motor, so that the start position does not shift. Therefore, it is possible to accurately drive the blade receiving portion 180 while reducing the amount of play while maintaining the state in which the step deviation of the stepping motor described with reference to FIG. 16 does not occur.

[Other various conditions (2)]
Further, it is desirable that the blade receiving portion 180 is configured to be driven in a direction including the direction of gravity each time the cutting is performed a predetermined number of times. In this case, even when a force due to gravity acts on the blade receiving portion 180 and the blade receiving portion 180 moves gradually, the movement due to the gravity of the blade receiving portion 180 and the driving of the blade receiving portion 180 every predetermined number of cuttings are performed. Is likely to be in the same direction, and the problem that the moving force on the driving object side flows back to the driving source side can be easily solved, and the driving object can be driven accurately.

[Other various conditions (3)]
Although the above drive buffer is intentionally provided with play in the drive direction, there may be other unintended play in the entire drive transmission system.
here,
B is the amount of play in the drive direction in the drive buffer set to absorb the movement of the blade receiving portion 180.
C is an additional drive amount added to A in the drive buffer,
D is the amount of play in the positive direction in the drive buffer due to the movement of the blade receiving portion 180.
F is the amount of play that appears in the drive buffer due to all play in the drive direction of the drive transmission system.
H is the amount of play in the non-driving shock absorber excluding B from F,
And.

In this case,
Each part is set so as to satisfy C> H.
As a result, the blade is provided with play in the drive direction by the drive buffer, and even when other play components are present in the entire drive transmission system, the blade is not affected by the play amount H of the non-drive buffer. It becomes possible to drive the receiving portion 180 accurately by A.

However, it is desirable to keep C as small as possible while satisfying C> H. This is because if C is unnecessarily large, the amount of extra drive increases, and the drive time and drive energy are wasted.
[Other various conditions (4)]
here,
A is the drive amount in the drive buffer unit corresponding to the target drive amount of the blade receiving portion 180,
B is the amount of play in the drive direction in the drive buffer set to absorb the movement of the blade receiving portion 180.
And.

In this case,
Set each part so as to satisfy A> B. Since B is automatically determined, A is determined according to B.
As a result, when the A + C drive in the positive direction, the B + C drive in the negative direction, and the D drive are executed, the pulley 130 does not return to the negative direction from the initial position, and appropriate control of the blade receiving portion 180 can be realized.

[Other various conditions (5)]
here,
A is the drive amount in the drive buffer unit corresponding to the target drive amount of the blade receiving portion 180 ,.
S is the amount obtained by converting the one-step resolution of the motor 110, which is a stepping motor, by the drive buffer.
And.

In this case, each part is set so that A is an integral multiple of S.
As a result, when the motor 110 is configured by the stepping motor by the control described in all of the above, appropriate and accurate drive control becomes possible.
[Other various conditions (6)]
In the above configuration and operation, the side where the rake face of the cutting blade 195 exists is defined as a predetermined direction when driving the blade receiving portion 180. In this case, the movement of the blade receiving portion 180 caused by the execution of cutting and the driving of the blade receiving portion 180 by the motor 110 are in the same direction, and the problem that the moving force generated on the blade receiving portion 180 side flows back to the motor 110 side is easy. This can be solved, and the blade receiving portion 180 can be driven accurately.

[Other various conditions (6)]
The present embodiment is characterized in that a drive buffer having a play in the drive direction is provided at any position of the drive transmission system. Here, in the drive transmission system, it will be described at which position it is appropriate to provide the drive buffer.

Here, the drive transmission system is divided into a drive system # 1 close to the motor 110 which is a drive source and a drive system # 2 close to the blade receiving portion 180 which is a drive target. For example, a motor shaft pulley, a belt, and a pulley. , The parallel pin is defined as the drive system # 1, and the shaft, pinion, and rack are defined as the drive system # 2. Then, the case where the drive system # 1 is provided with the play on the pin groove and the parallel pin and the case where the drive system # 2 is provided with the play on the pinion and the rack are compared as shown in FIG.

In this case, the reduction ratio of the drive system usually increases from the drive source to the object to be driven, so that the following effects are obtained.
(1) The closer the drive buffer is to the drive source, the less play is required in the pin groove that serves as a buffer. That is, the closer the drive buffer is to the drive source, the more efficient the drive buffer is to play, even if the amount is the same.

(2) The effect of the stop position accuracy of the parallel pins in the play near the drive source is 1 / reduction ratio downstream. That is, the closer the drive buffer is to the drive source, the easier it is to achieve high accuracy.
(3) Since the rotation speed is faster as the drive buffer is closer to the drive source, the idle running time (drive loss time) when the drive buffer is moved to one side of the play becomes shorter. That is, the closer the drive buffer is to the drive source, the easier it is to improve productivity and efficiency.

[Other Embodiments (1)]
In the above embodiment, the blade receiving portion 180 is driven as a driving object, but the present invention is not limited to this specific example.

10 Image forming device 20 Post-processing device 30 Post-processing device 40 Post-processing device 101 Control unit 110 Motor 115 Pulley 120 Belt 130 Pulley 135 Pin groove 140 Parallel pin 150 Shaft 160 Pinion 170 Rack 180 Blade receiving part 190 Facing surface 195 Cutting blade

Claims (9)

An object used in the process is used as a drive object, and the driving force of the drive source is transmitted to the drive object via the drive transmission system to drive the drive object in a predetermined direction in relation to the process. An aftertreatment device that causes movement of the driving object regardless of the driving force.
A control unit that controls the drive source,
A drive buffer having a play in the drive direction is provided at any position of the drive transmission system.
A is the driving amount in the driving buffer corresponding to the target driving amount of the driving object,
The amount of play in the driving direction in the driving buffer set so that B absorbs the movement of the driving object,
An additional drive amount that adds C to the A in the drive buffer,
The side of the drive buffer near the drive source is the input drive side.
The side of the drive buffer near the drive object is the output drive side.
The drive object can be fixed and unfixed,
When
The control unit
Release the fixing of the driving object,
Drive the input drive side in the positive direction by A + C,
Drive the input drive side in the negative direction by B + C,
Fix the driving object,
The input drive side is driven in the positive direction in the range of B or less according to the range of movement generated in the drive object.
Control the drive buffer to drive the input drive side of the drive buffer.
An aftertreatment device characterized by the fact that. A cutting blade that cuts paper as the above process,
When the paper is cut by the cutting blade, the cutting blade is received through the paper and the blade receiving portion as the driving object is driven in a predetermined direction at a predetermined timing.
The control unit
Every time the cutting is performed a predetermined number of times, the blade receiving portion is driven in a predetermined direction.
The post-processing apparatus according to claim 1. The drive source is a stepping motor.
The control unit drives the stepping motor based on the step angle so that the drive buffer unit drives the A, the B, and the C.
The post-processing apparatus according to any one of claims 1 to 2, wherein the post-processing apparatus is characterized in that. The stepping motor as the drive source and
A cutting blade that cuts paper as the above process,
When the paper is cut by the cutting blade, the cutting blade is received through the paper and the blade receiving portion as the driving object is driven in a predetermined direction at a predetermined timing.
The value obtained by converting the one-step resolution of the stepping motor by the drive buffer is S.
When the amount of deviation in the drive buffer is E due to the movement generated in the blade receiving portion by cutting a predetermined number of times.
Each part of the play amount B, the step resolution S, and the deviation amount E is set so as to satisfy B> E-0.5S.
The post-processing apparatus according to any one of claims 1 to 3, wherein the post-processing apparatus is characterized in that. The control unit controls to drive the blade receiving unit with the side where the rake face of the cutting blade exists as the predetermined direction.
2. The post-processing apparatus according to claim 2. The blade receiving portion is configured to be driven in a direction including the direction of gravity.
The post-processing apparatus according to any one of claims 2 and 5. When the total play amount of the drive transmission system in which the play in the drive direction of all the drive transmission systems appears in the drive buffer is F.
The additional drive amount C in the drive buffer portion is set to be larger than the play amount H of the non-drive buffer unit obtained by removing the play amount B from the play amount F of the entire drive transmission system.
The post-processing apparatus according to any one of claims 1 to 6, wherein the post-processing apparatus is characterized in that. The drive shock absorber
It has a shaft, a parallel pin press-fitted into the shaft, a pulley through which the shaft rotatably penetrates the center of rotation, and a pin groove provided in the pulley.
When the parallel pin rotates about the shaft, the pin groove is configured to be provided with a play in the rotation direction of the parallel pin.
The post-processing apparatus according to any one of claims 1 to 7, wherein the post-processing apparatus is characterized in that. An object used in the process is used as a drive object, and the driving force of the drive source is transmitted to the drive object via the drive transmission system to drive the drive object in a predetermined direction in relation to the process. A post-processing device control method for controlling a post-processing device in which movement of a driven object occurs regardless of the driving force.
The aftertreatment device is
A control unit that controls the drive source,
A drive buffer having a play in the drive direction is provided at any position of the drive transmission system.
A is the driving amount in the driving buffer corresponding to the target driving amount of the driving object,
The amount of play in the driving direction in the driving buffer set so that B absorbs the movement of the driving object,
An additional drive amount that adds C to the A in the drive buffer,
The side of the drive buffer near the drive source is the input drive side.
The side of the drive buffer near the drive object is the output drive side.
The drive object can be fixed and unfixed,
If
Release the fixing of the driving object,
Drive the input drive side in the positive direction by A + C,
Drive the input drive side in the negative direction by B + C,
Fix the driving object,
The input drive side is driven in the positive direction in the range of B or less according to the range of movement generated in the drive object.
The drive source drives the input drive side of the drive buffer.
A post-processing device control method characterized in that.

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