JP2018100171A - Punching device and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a punching device capable of efficient punching.SOLUTION: An image forming apparatus 11 comprises a brake control unit 51, a determination unit 52, a deviation amount decision unit 53, a stop position adjustment unit 54, and a brake timing adjustment unit 55. The deviation amount decision unit 53 calculates an amount of deviation between a stop position and a target position of a rotational axis 32 based on a home position detected by a HP detection sensor 37 when the determination unit 52 determines that the positions are not coincident with each other. The stop position adjustment unit 54 supplies, based on the amount of deviation calculated by the deviation amount decision part 53, a current from a current supply unit 35 so that the stop position of the rotational axis 32 is coincident with the target position, and rotates the rotational axis 32 for adjustment. The brake timing adjustment unit 55 adjusts the timing of braking by the brake control part 51, based on the amount of deviation calculated by the deviation amount decision part 53.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a perforation processing apparatus and an image forming apparatus.

  In an image forming apparatus typified by a multifunction peripheral or the like, after an image of a document is read by an image reading unit, light is irradiated on the photoconductor provided in the image forming unit based on the read image, and An electrostatic latent image is formed on the surface. Thereafter, a developer is supplied onto the formed electrostatic latent image to form a visible image, which is then transferred to a sheet, fixed, and discharged outside the apparatus.

  Japanese Laid-Open Patent Publication No. 2004-345834 (Patent Document 1) discloses a paper punching apparatus that is included in an image forming system including an image forming apparatus and performs punching processing on paper on which an image has been formed as post-processing. A paper punching device disclosed in Patent Document 1 includes a motor for punching operation, a motor driving amount detecting unit for detecting the driving amount of the motor, and a measuring unit for measuring time for a predetermined time during driving of the motor. And during the drilling operation, the motor drive amount for a predetermined time during the motor drive measured by the measurement unit is measured by the motor drive amount detection unit, and the motor stop operation start position is changed by the measured motor drive amount. And a control unit for controlling the operation.

JP 2004-345834 A

  In a punching apparatus that punches a sheet, the sheet is punched by a punching blade that moves up and down in accordance with the rotational movement of the rotating shaft. The rotating shaft rotates with a motor that rotates by supplying current. Here, in order to perform the drilling process with high accuracy, it is required to start the vertical movement of the drilling blade from a predetermined target position.

  At the time of punching processing, after the paper is punched by the punching blade, the motor is braked to stop the rotational movement of the rotary shaft and the vertical movement of the punching blade. When a brake is applied to the motor during the drilling process, the motor may not stop immediately when the brake is applied, but may stop due to some overrun due to inertial force. In order to accurately start the vertical movement of the drilling blade from a predetermined target position, it is necessary to control the brake in consideration of the amount of overrun. However, the amount of overrun cannot be set uniformly due to variations in motor performance and characteristics, and environmental factors such as motor temperature. That is, it is not possible to uniformly set the brake timing in consideration of overrun.

  If it does so, about the drilling blade stopped by the brake, it will be necessary to drive a motor again and to rotate a rotating shaft until it will be in a predetermined aim position. As a result, it may take a long time to move to a predetermined target position, and this situation hinders the efficiency of the drilling process. That is, it is required to bring the position where the drilling blade stops as close as possible to the predetermined target position as accurately as possible. Such a request cannot be met by the technique disclosed in Patent Document 1.

  An object of the present invention is to provide a perforation processing apparatus that can efficiently perform perforation processing.

  Another object of the present invention is to provide an image forming apparatus capable of efficiently punching a paper on which an image has been formed.

  In one aspect of the present invention, the punching processing device performs punching processing at a predetermined position of the paper. The perforation processing device includes a rotation shaft, a perforation blade, a motor, a current supply unit, a rotation angle detection unit, a brake control unit, a home position detection unit, a determination unit, a deviation amount determination unit, and a stop position. An adjustment unit and a brake timing adjustment unit are provided. The punching blade moves in the vertical direction according to the rotational movement of the rotary shaft to punch the paper. The motor rotates the rotating shaft by driving. The current supply unit supplies a current for driving the motor. The rotation angle detection unit detects the rotation angle of the rotation shaft. When the rotation angle detection unit detects that the rotation shaft has rotated to a predetermined angle, the brake control unit stops the current supply by the current supply unit to stop the rotation of the rotation shaft and brakes the motor. Control as follows. The home position detection unit detects a home position that is a reference position of the rotating shaft after the operation of the brake control unit. The determination unit determines whether or not the stop position of the rotating shaft matches the target position that is the starting target position when rotating the rotating shaft after the operation of the brake control unit. If the determination unit determines that they do not match, the shift amount determination unit calculates the shift amount between the stop position of the rotary shaft and the target position based on the home position detected by the home position detection unit. Based on the deviation amount calculated by the deviation amount determination unit, the stop position adjustment unit supplies current by the current supply unit so that the stop position of the rotation shaft coincides with the target position, and adjusts the rotation shaft by rotating it. The brake timing adjustment unit adjusts the brake timing by the brake control unit based on the deviation amount calculated by the deviation amount determination unit.

  In another aspect of the present invention, an image forming apparatus includes an image forming unit and a punching processing device. The image forming unit forms an image on a sheet. The perforation processing device performs perforation processing at a predetermined position of the paper on which the image is formed by the image forming unit. The punching processing device performs punching processing at a predetermined position of the sheet. The perforation processing device includes a rotation shaft, a perforation blade, a motor, a current supply unit, a rotation angle detection unit, a brake control unit, a home position detection unit, a determination unit, a deviation amount determination unit, and a stop position. An adjustment unit and a brake timing adjustment unit are provided. The punching blade moves in the vertical direction according to the rotational movement of the rotary shaft to punch the paper. The motor rotates the rotating shaft by driving. The current supply unit supplies a current for driving the motor. The rotation angle detection unit detects the rotation angle of the rotation shaft. When the rotation angle detection unit detects that the rotation shaft has rotated to a predetermined angle, the brake control unit stops the current supply by the current supply unit to stop the rotation of the rotation shaft and brakes the motor. Control as follows. The home position detection unit detects a home position that is a reference position of the rotating shaft after the operation of the brake control unit. The determination unit determines whether or not the stop position of the rotating shaft matches the target position that is the starting target position when rotating the rotating shaft after the operation of the brake control unit. If the determination unit determines that they do not match, the shift amount determination unit calculates the shift amount between the stop position of the rotary shaft and the target position based on the home position detected by the home position detection unit. Based on the deviation amount calculated by the deviation amount determination unit, the stop position adjustment unit supplies current by the current supply unit so that the stop position of the rotation shaft coincides with the target position, and adjusts the rotation shaft by rotating it. The brake timing adjustment unit adjusts the brake timing by the brake control unit based on the deviation amount calculated by the deviation amount determination unit.

  According to such a perforation processing apparatus, the amount of deviation of how much the stop position of the rotating shaft deviates from the starting position when rotating the rotating shaft is calculated, and the brake timing is calculated based on the amount of deviation. Is going to be adjusted. If it does so, when applying a brake to a motor and stopping a rotating shaft, it can stop closer to a target position. If it does so, efficiency at the time of making the stop position of a rotating shaft correspond with a target position can be aimed at. Therefore, the drilling process can be performed efficiently.

  Further, according to such an image forming apparatus, it is possible to efficiently perform punching processing on a sheet on which an image is formed.

1 is a diagram illustrating an appearance of an image forming apparatus including a perforation processing apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating a configuration of the image forming apparatus illustrated in FIG. 1. It is an external appearance perspective view which shows the structure of a part of punching processing apparatus. It is an external perspective view which shows the structure of a part of punching processing apparatus, and has expanded and shown a part of rotation angle detection sensor and a part of home position detection sensor. It is an external appearance perspective view which shows the structure of a part of punching processing apparatus, and has expanded and showed the rotation angle detection sensor and the home position detection sensor. It is a block diagram which shows the structure of a control part. 6 is a flowchart illustrating a flow of processing when performing punching processing using a multifunction peripheral. It is a graph which shows the supply state of the electric current to a motor.

  Embodiments of the present invention will be described below. FIG. 1 is a diagram showing a multifunction machine 11 when an image forming apparatus including a punching processing device 31 according to an embodiment of the present invention is applied to the multifunction machine. FIG. 2 is a block diagram showing a configuration of the multifunction machine 11 shown in FIG.

  Referring to FIGS. 1 and 2, the multi-function device 11 has a plurality of functions such as a copying function, a printer function, and a facsimile function regarding image processing. The multifunction machine 11 includes a control unit 12, an operation unit 13, an image reading unit 14, an image forming unit 15, a hard disk 16, and a network interface unit 17 for connecting to a network (not shown). It includes three paper feed cassettes 23 that can store paper, and a post-processing device 26 that performs post-processing on the paper.

  The control unit 12 controls the entire multifunction machine 11. The control unit 12 includes a CPU (Central Processing Unit) and the like, and includes a main storage memory 18 that temporarily stores data. The operation unit 13 includes a touch panel type display screen 21 as a display unit for displaying information such as information transmitted from the multifunction machine 11 side and user input contents. The image reading unit 14 includes an ADF (Auto Document Feeder) 22 as a document transport device that transports a document set at the set position to the read position. The image reading unit 14 reads an image of a document set on the ADF 22 or a mounting table (not shown). The image forming unit 15 forms an image on the sheet conveyed from the sheet feeding cassette 23 based on the image read by the image reading unit 14 and the image data transmitted via the network. The hard disk 16 stores data such as image data and input image forming conditions.

  The post-processing device 26 includes a staple processing device 27 that performs a stapling process by stacking a plurality of sheets on which images are formed by the image forming unit 15, and a punching process, that is, punching, on the sheets on which images are formed by the image forming unit 15. And a perforation processing device 31 that performs processing. This post-processing device 26 is also called a finisher. The post-processing device 26 is detachably provided on the main body 19 of the multifunction machine 11.

  Next, the configuration of the punching processing device 31 will be described. 3, 4, and 5 are each an external perspective view showing a part of the configuration of the punching processing device 31. FIG. 4 is an enlarged view of a part of a rotation angle detection sensor and a part of a home position detection sensor which will be described later. FIG. 5 is an enlarged view of the rotation angle detection sensor and the home position detection sensor.

3 to 5 in conjunction with FIG. 2, the punching processing device 31 includes a rotation shaft 32, a punching blade 33, a DC motor 34, a current supply unit 35, and a rotation angle as a rotation angle detection unit. A detection sensor 36 and an HP detection sensor 37 as a home position (hereinafter sometimes abbreviated as “HP”) detection unit are provided. Rotary shaft 32 is a member of a round bar extending straight in the direction indicated by the arrow D ₁ of the in Figure 3. A DC motor 34 is attached to one end of the rotating shaft 32. Since the DC motor 34 is accompanied by a large load fluctuation during rotation, for example, a DC (Direct Current) motor is adopted as the type of the DC motor 34. DC motor 34 rotates in the direction of the direction or vice versa showing the rotary shaft 32 in an arrow R ₁ in FIGS. 3 to 5 by the drive. The current supply unit 35 supplies a current for driving the DC motor 34 to the DC motor 34. When the supply of current to the DC motor 34 by the current supply unit 35 stops, the DC motor 34 stops. When the DC motor 34 is stopped, the DC motor 34 is stopped after rotating to some extent by inertial force.

The piercing blade 33 is attached to the rotary shaft 32 by a piercing blade holding portion 38. The punching blade 33 moves in the vertical direction according to the rotational movement of the rotary shaft 32 to punch the paper. Specifically, rotational movement of the rotary shaft 32 is converted by the cam and gears (not shown) in the vertical direction of movement is the direction of the direction or vice versa indicated by the arrow D ₂ in FIG. The paper is perforated by pushing down the perforating blade 33 at the timing when the paper is conveyed to the perforation processing device 31. In this case, the punching blade 33 punches, for example, a region at the end of the paper on which the image is formed by the image forming unit 15. With respect to the content of the punching process for the paper, a request is received from the user via the operation unit 13. Further, every time the rotating shaft 32 makes one rotation, the punching operation is performed once. That is, when the rotary shaft 32 makes one rotation, the punching blade 33 reciprocates once in the vertical direction and returns to the original position. In addition, although the number of perforation blades 33 is illustrated in FIG. 3, a plurality of perforation blades 33 may be provided in a direction indicated by an arrow D <b> ₁ that is a direction in which the rotation shaft 32 extends. Specifically, for example, four perforation processing devices 31 may be provided at predetermined intervals. By doing so, it becomes easier to drill at a position desired by the user.

  Next, the configuration of the rotation angle detection sensor 36 that detects the rotation angle of the rotation shaft 32 will be described. The rotation angle detection sensor 36 includes a pulse plate 41 and a light detection unit 42. The pulse plate 41 has a disc shape, and when attached to the rotary shaft 32, a plurality of apertures 43 are provided in a portion called a flange at regular intervals in the circumferential direction. Each of the plurality of apertures 43 has a shape extending radially about the rotation shaft 32. In this case, specifically, 36 openings 43 are provided. The pulse plate 41 is attached to the rotation shaft 32 and rotates together with the rotation shaft 32. The light detection unit 42 receives light emitted from the light emitting unit 44a and a light emitting unit 44a that emits light in the thickness direction of the pulse plate 41 in a radial region of the pulse plate 41 where the apertures 43 are provided. Light receiving unit 44b. The light emitting unit 44 a and the light receiving unit 44 b are held by the holding unit 45. In this case, the pulse plate 41 is configured to be partially sandwiched between the light emitting unit 44a and the light receiving unit 44b. The light detection unit 42 detects the rotation angle of the rotary shaft 32 based on the light receiving state of the light emitted from the light emitting unit 44a in the light receiving unit 44b. In this case, with respect to the rotation angle of the rotating shaft 32, the position where the opening 43 is provided and the opening 43 are provided depending on the light transmission state between the light emitting part 44a and the light receiving part 44b in the thickness direction of the pulse plate 41. A position that is not present is detected as a pulse. Specifically, since the number of the apertures 43 and the interval between the apertures 43 are constant, by counting the number of pulses, the degree of rotation with respect to a predetermined position, that is, the rotation of the rotary shaft 32 The angle can be detected.

Next, the configuration of the HP detection sensor 37 will be described. The HP detection sensor 37 detects a home position that is a reference position of the rotating shaft 32 after the operation of a brake control unit 51 described later. The HP detection sensor 37 includes an HP detection plate 46 and a light detection unit 47. The HP detection plate 46 has a disk shape, and when attached to the rotary shaft 32, a notch 48 serving as a reference for the home position is provided at a predetermined position in the circumferential direction in a portion called a flange. Yes. The HP detection plate 46 is attached to the rotation shaft 32 and rotates together with the rotation shaft 32. The position where the HP detection plate 46 is provided is closer to the drilling blade 33 than the position where the pulse plate 41 is provided. That, DC motor 34, a pulse plate 41, HP detection plate 46, and the order of the cutting head holding section 38 for holding the punching blade 33, and has a side-by-side arrangement in the direction of arrow _{D 1.} The diameter of the HP detection plate 46 is configured to be smaller than the diameter of the pulse plate 41. The light detection unit 47 includes a light emitting unit 49a that emits light in the thickness direction of the HP detection plate 46 in the radial region of the HP detection plate 46 where the notch 48 is provided, and light emitted by the light emitting unit 49a. And a light receiving portion 49b for receiving light. The light emitting unit 49 a and the light receiving unit 49 b are held by the holding unit 50. In this case, the HP detection plate 46 is configured to be partially sandwiched between the light emitting unit 49a and the light receiving unit 49b. The light detection unit 47 has a position where the cutout 48 is provided and the cutout 48 depending on a light receiving state of the light emitted from the light emitting unit 49a in the light receiving unit 49b, that is, a light transmission state in the thickness direction of the HP detection plate 46. A position where no is provided is detected.

  Next, the configuration of the control unit 12 will be described. FIG. 6 is a block diagram illustrating a configuration of the control unit 12. Referring to FIG. 6, the control unit 12 includes a brake control unit 51, a determination unit 52, a deviation amount determination unit 53, a stop position adjustment unit 54, and a brake timing adjustment unit 55. When the rotation angle detection sensor 36 detects that the rotation shaft 32 has rotated to a predetermined angle, the brake control unit 51 stops supplying current by the current supply unit 35 so as to stop the rotation of the rotation shaft 32. Control is performed so that the DC motor 34 is braked. After the operation of the brake control unit 51, the determination unit 52 determines whether or not the stop position of the rotary shaft 32 matches the target position that is the target position for starting the rotation of the rotary shaft 32. If the determination unit 52 determines that they do not match, the deviation amount determination unit 53 calculates the deviation amount between the stop position of the rotary shaft 32 and the target position based on the home position detected by the HP detection sensor 37. Based on the deviation amount calculated by the deviation amount determination unit 53, the stop position adjustment unit 54 supplies current by the current supply unit 35 so that the stop position of the rotation shaft 32 matches the target position, and rotates the rotation shaft 32. To adjust. The brake timing adjustment unit 55 adjusts the brake timing by the brake control unit 51 based on the deviation amount calculated by the deviation amount determination unit 53. These configurations will be described in detail later.

  Next, a case where punching processing is performed on a sheet on which an image is formed using the multifunction machine 11 according to an embodiment of the present invention will be described. FIG. 7 is a flowchart showing the flow of processing when performing punching processing using the multifunction machine 11. Referring to FIG. 7, first, a sheet is conveyed from sheet feeding cassette 23 to image forming unit 15, and an image is formed on the sheet in image forming unit 15. Here, if a request for paper punching processing is received by the operation unit 13 or the like (in FIG. 7, YES in step S11, hereinafter, “step” is omitted), up to the position where the punching processing device 31 is provided. The paper on which the image is formed is conveyed (S12). If a request for punching processing has not been received (NO in S11), the sheet on which the image has been formed is discharged out of the multifunction machine 11 and the processing is terminated (S24).

  After the sheet is conveyed, a punching process is performed on the sheet. Specifically, first, the driving of the DC motor 34 is started (S13). That is, when the DC motor 34 is driven, a current is supplied to the DC motor 34 by the current supply unit 35. And the detection of the rotation angle of the rotating shaft 32 by the rotation angle detection sensor 36 is started (S14).

  FIG. 8 is a graph showing a current supply state to the DC motor 34. In FIG. 8, the vertical axis indicates the current value supplied to the DC motor 34, and the horizontal axis indicates the elapsed time. In FIG. 8, a current value supplied to the DC motor 34 is indicated by a line 56 a. A state where a current having a predetermined current value is supplied to the DC motor 34 is a state where a positive current is supplied, and a state where no current is supplied is turned off. Further, when a reverse current flows, a negative current flows.

In FIG. 8, the rotational speed of the DC motor 34, the output state of the rotation angle detection sensor 36, and the output state of the HP detection sensor 37 are also indicated by lines 56b, 56c, and 56d, respectively. The rotational speed of the DC motor 34 indicated by line 56b, "0" that is, not rotating gradually accelerates from a state in which stopped after a maximum rotational speed in the vicinity of the time T ₃ , continue to decelerate, shows a state that once stopped at time T _4. The rotation angle detection sensor 36 is in the ON state and is shielded by the pulse plate 41, that is, indicates that the light from the light emitting portion 44a is emitted between the two openings 43 and cannot be received by the light receiving portion 44b. Shows a state where light passes through the aperture 43 and is received by the light receiving portion 44b. As for the HP detection sensor 37, the ON state indicates a shielding state, that is, the state where the light emitted from the light emitting portion 44a is shielded by the HP detection plate 46 not provided with the notch 48, and the OFF state indicates the notch. A state in which the light emitted from the light emitting unit 44a after passing through 48 is received by the light receiving unit 44b is shown.

Together with reference also to FIG. 8, the supply of current to the DC motor 34 by the current supply unit 35, starting from the time T _1. Then, the DC motor 34 is gradually driven, and the rotating shaft 32 starts to rotate. Here, as shown in line 56c, a pulse due to repeated on and off by opening 43 appears from the time T _2. The rotational speed of the rotating shaft 32 based on the repetition of the ON state and OFF state of this pulse is represented by a line 56b. Further, when reached the time T _2, for the detection state in HP detection sensor 37 changes from the OFF state to the ON state. That is, it is detected that the rotation from the position where the notch 48 is provided to the position where the notch 48 is not provided.

Then, it continues to be supplied with current until the time T _3, perforation processing on sheet is performed. Specifically, the sheet is perforated at the time of the rotation speed becomes the maximum time T _3. In this case, the rotation angle of the rotating shaft 32 is detected by counting the number of on / off pulses appearing on the line 56c. This count is about 27 to 28 for 36 apertures 43.

  If it is detected that the rotation shaft 32 has rotated to a predetermined angle by counting the pulses (YES in S15), braking by the brake control unit 51 is started (S16). In other words, the brake control unit 51 controls the DC motor 34 to be braked by stopping the supply of the current supplied by the current supply unit 35 so as to stop the rotation of the rotary shaft 32. Even after the brake is applied, the rotating shaft 32 rotates while decelerating due to the inertial force of the DC motor 34 as indicated by a line 56b. At this time, a negative current is generated and flows through the DC motor 34 as shown by a line 56a. In addition, after the brake control unit 51 is activated, HP detection is started by the HP detection sensor 37.

After operation of the brake control unit 51, it reaches the time T _5, when the rotation of the rotary shaft 32 is stopped, the determination unit 52 is set to the position whose aim of starting when rotating the rotary shaft 32 and the stop position of the rotary shaft 32 It is determined whether or not the target position matches (S17). If the stop position of rotating shaft 32 matches the target position (YES in S17), the drilling operation is terminated (S23).

On the other hand, if the determination unit 52 determines that they do not match (NO in S17), the amount of deviation between the stop position of the rotary shaft 32 and the target position is calculated based on the home position detected by the HP detection sensor 37. (S18). Here, the target position is a position rotated by two pulses after the HP detection state changes from the on state to the off state. And in this embodiment, after stopping from an ON state by the HP detection sensor 37 without stopping at a target position, it stops without detecting a pulse. Then, the shift amount determination unit 53 calculates the shift amount as two pulses. Then, the stop position adjusting unit 54 supplies the current again by the current supply unit 35 based on the deviation amount calculated by the deviation amount determining unit 53 so that the stop position of the rotary shaft 32 matches the target position. 32 stop position is adjusted. In this case the supply, (in S19, YES) is being determined to be stopped in front of the target position for, by intermittently six times the current supply portion 35 a positive current from time T ₆ as shown in the line 56a And rotate it forward. Then, the first pulse at time T _7, detects a second pulse at time T _8, and terminates the adjustment of the stop position at time T ₉ which terminates the detection of the second pulse. In this way, the stop position of the rotating shaft 32 is adjusted to coincide with the target position (S20).

  On the other hand, when the target position is passed, that is, after detecting the ON state to the OFF state on line 56d and then counting more than two pulses on line 56c (NO in S19), current supply unit 35 Thus, a negative current is intermittently supplied a plurality of times to reversely rotate, and the stop position of the rotary shaft 32 is adjusted to coincide with the target position (S21). That is, the stop position of the rotating shaft 32 is adjusted by rotating the DC motor 34 in the reverse direction.

  After adjusting the stop position, the brake timing adjustment unit 55 adjusts the timing of the brake by the brake control unit 51 based on the deviation amount calculated by the deviation amount determination unit 53 (S22). Specifically, if the rotation is rotated forward according to the amount of deviation and the stop position of the rotary shaft 32 is moved to the target position, the brake timing is slightly earlier, specifically, two pulses earlier, so that it is delayed by two pulses. The brake timing in the brake control unit 51 is adjusted so that the brake is applied. Further, if the reverse rotation is performed according to the amount of deviation and the stop position of the rotary shaft 32 is moved to the target position, the brake timing is adjusted, so that the brake timing in the brake control unit 51 is adjusted to apply the brake early. . Then, the punching operation is finished (S24).

  According to such a configuration, the amount of deviation of how much the stop position of the rotating shaft 32 is deviated from the starting position when the rotating shaft 32 is rotated is calculated, and the brake timing is calculated based on the amount of deviation. Is going to be adjusted. As a result, when the brake is applied to the DC motor 34 to stop the rotary shaft 32, the DC motor 34 can be stopped closer to the target position. If it does so, the efficiency improvement at the time of making the stop position of the rotating shaft 32 correspond with a target position can be aimed at. Therefore, the drilling process can be performed efficiently.

  In this case, if the stop position of the rotating shaft 32 is closer to the rotation direction than the target position, the stop position adjusting unit 54 adjusts the stop position of the rotating shaft 32 by rotating the DC motor 34 forward. If the stop position of the rotary shaft 32 is behind the target position in the rotational direction, the DC motor 34 is rotated in the reverse direction to adjust the stop position of the rotary shaft 32. Therefore, the stop position of the rotary shaft 32 is aimed more efficiently. It can be a position.

  Further, in this case, the rotation angle detection sensor 36 has a disk shape and is provided with openings 43 at regular intervals in the circumferential direction. The pulse plate 41 is attached to the rotation shaft 32 and rotates together with the rotation shaft 32. And a light detection unit 42 that detects the rotation angle of the rotary shaft 32 by using the position where the opening 43 is provided and the position where the opening 43 is not provided depending on the light transmission state in the thickness direction of the pulse plate 41 as a pulse. It is the structure containing. Therefore, the rotation angle of the rotating shaft 32 can be detected with higher accuracy by counting the pulses from the opening 43.

  Further, in this case, the HP detection sensor 37 has a disk shape and is provided with a notch 48 serving as a guide for a predetermined reference position at a predetermined position in the circumferential direction. 32 includes a HP detection plate 46 that rotates together with the light detection plate 32, and a light detection unit 47 that detects the position where the notch 48 is provided depending on the light transmission state in the thickness direction of the HP detection plate 46. Therefore, it is possible to efficiently detect the shift amount by using the notch 48.

  In the above embodiment, the shift amount determination unit 53 calculates the shift amount based on the number of pulses. However, the present invention is not limited to this. For example, the shift amount determination unit 53 is turned off from an on state that passes through the notch 48. The amount of deviation may be calculated by measuring the time from the state timing.

  Moreover, in said embodiment, it was set as the structure further equipped with the temperature detection part which detects the temperature of DC motor 34, and the electric current supply part 35 was detected by the temperature detection part so that the rotation speed of the rotating shaft 32 might become constant. The value of the current to be supplied may be changed according to the temperature of the DC motor 34. By doing so, for example, the set current value can be changed in accordance with a rise in the temperature of the DC motor 34, the rotation speed can be made the same, and accurate control can be performed.

  In the above embodiment, the DC motor is used. However, the present invention is not limited to this, and other motors may be used.

  Moreover, you may comprise the perforation processing apparatus 31 based on this invention as follows. That is, the punching processing device 31 that performs punching processing at a predetermined position of the paper includes a rotation shaft 32, a punching blade 33, a DC motor 34, a current supply unit 35, a rotation angle detection sensor 36, and a brake control unit 51. A home position detection sensor 37, a determination unit 52, a shift amount determination unit 53, a stop position adjustment unit 54, and a brake timing adjustment unit 55. The punching blade 33 moves in the vertical direction according to the rotational movement of the rotary shaft 32 to punch the paper. The DC motor 34 rotates the rotating shaft 32 by driving. The current supply unit 35 supplies a current for driving the DC motor 34. The rotation angle detection sensor 36 detects the rotation angle of the rotation shaft 32. When the rotation angle detection sensor 36 detects that the rotation shaft 32 has rotated to a predetermined angle, the brake control unit 51 stops supplying current by the current supply unit 35 so as to stop the rotation of the rotation shaft 32. Control is performed so that the DC motor 34 is braked. The home position detection sensor 37 detects the home position that is the reference position of the rotating shaft 32 after the operation of the brake control unit 51. After the operation of the brake control unit 51, the determination unit 52 determines whether or not the stop position of the rotary shaft 32 matches the target position that is the target position for starting the rotation of the rotary shaft 32. If the determination unit 52 determines that they do not match, the shift amount determination unit 53 calculates the shift amount between the stop position of the rotary shaft 32 and the target position based on the home position detected by the home position detection sensor 37. . Based on the deviation amount calculated by the deviation amount determination unit 53, the stop position adjustment unit 54 supplies current by the current supply unit 35 so that the stop position of the rotation shaft 32 matches the target position, and rotates the rotation shaft 32. To adjust. The brake timing adjustment unit 55 adjusts the brake timing by the brake control unit 51 based on the deviation amount calculated by the deviation amount determination unit 53.

  It should be understood that the embodiments and examples disclosed herein are illustrative in all respects and are not restrictive in any respect. The scope of the present invention is defined by the scope of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the scope of the claims.

  The punching processing apparatus and the image forming apparatus according to the present invention are particularly effectively used when efficient punching processing is required.

DESCRIPTION OF SYMBOLS 11 MFP, 12 Control part, 13 Operation part, 14 Image reading part, 15 Image formation part, 16 Hard disk, 17 Network interface part, 18 Main memory, 19 Main part, 21 Display screen, 22 ADF, 23 Paper feed cassette , 26 Post-processing device, 27 Staple processing device, 31 Punch processing device, 32 Rotating shaft, 33 Punching blade, 34 DC motor, 35 Current supply unit, 36 Rotation angle detection sensor, 37 Home position detection sensor, 38 Punching blade holding unit , 41 Pulse plate, 42, 47 Light detection unit, 43 Opening, 44a, 49b Light emission unit, 44a, 49b Light reception unit, 45 Pulse sensor holding unit, 46 Home position detection plate, 48 Notch, 50 Detection sensor holding unit, 51 Brake control unit, 52 Judgment unit, 53 Deviation amount determination unit, 54 Stop position adjustment , 55 brake timing controller, 56a, 56b, 56c, 56d line.

Claims (8)

A perforation processing apparatus that performs perforation processing at a predetermined position of a sheet,
A rotation axis;
A perforating blade for perforating paper by moving in the vertical direction according to the rotational movement of the rotating shaft;
A motor that rotates the rotating shaft by driving;
A current supply unit for supplying a current for driving the motor;
A rotation angle detector for detecting a rotation angle of the rotation shaft;
If the rotation angle detector detects that the rotation shaft has rotated to a predetermined angle, the current supply by the current supply unit is stopped so that the rotation of the rotation shaft is stopped, and the motor is braked. A brake control unit that controls to apply,
A home position detector that detects a home position that is a reference position of the rotating shaft after the operation of the brake controller;
A determination unit that determines whether or not a stop position of the rotating shaft and a target position that is a starting target position when rotating the rotating shaft match after the operation of the brake control unit;
A shift amount determination unit that calculates a shift amount between the stop position of the rotary shaft and the target position based on the home position detected by the home position detection unit if the determination unit determines that they do not match; ,
Based on the deviation amount calculated by the deviation amount determination unit, a current is supplied by the current supply unit so that the stop position of the rotary shaft coincides with the target position, and the rotary shaft is rotated and adjusted. A position adjustment unit;
A punching processing apparatus comprising: a brake timing adjustment unit that adjusts a timing of the brake by the brake control unit based on the deviation amount calculated by the deviation amount determination unit. The stop position adjustment unit adjusts the stop position of the rotary shaft by rotating the motor forward if the stop position of the rotary shaft is closer to the rotation direction than the target position. The perforation processing apparatus according to claim 1, wherein if the position is behind the target position in the rotation direction, the motor is reversely rotated to adjust the stop position of the rotation shaft. A temperature detection unit for detecting the temperature of the motor;
The current supply unit changes the value of the current to be supplied according to the temperature of the motor detected by the temperature detection unit so that the number of rotations of the rotating shaft is constant. The punching processing apparatus as described. The rotation angle detector is disc-shaped and has openings at regular intervals in the circumferential direction. The pulse plate is attached to the rotation shaft and rotates together with the rotation shaft, and the thickness of the pulse plate. A pulse sensor that detects a rotation angle of the rotating shaft by using a position where the opening is provided and a position where the opening is not provided as a pulse depending on a state of light transmission in a direction. 4. The perforation processing apparatus according to claim 1. The perforation processing apparatus according to claim 4, wherein the shift amount determination unit calculates the shift amount based on the number of pulses. The home position detector is disc-shaped, and is provided with a notch serving as a guide for the home position at a predetermined circumferential position. The home position detector is attached to the rotating shaft and rotates together with the rotating shaft. 6. The apparatus according to claim 1, further comprising: a detection plate; and a home position detection sensor that detects a position where the notch is provided depending on a light transmission state in a thickness direction of the home position detection plate. The punching processing apparatus as described. The perforation processing apparatus according to claim 1, wherein the motor includes a DC (Direct Current) motor. An image forming apparatus comprising: an image forming unit that forms an image on a sheet; and a punching processing device that performs a punching process on a predetermined position of the sheet on which the image is formed by the image forming unit.
The perforation processing apparatus includes:
A rotation axis;
A perforating blade for perforating paper by moving in the vertical direction according to the rotational movement of the rotating shaft;
A motor that rotates the rotating shaft by driving;
A current supply unit for supplying a current for driving the motor;
A rotation angle detector for detecting a rotation angle of the rotation shaft;
If the rotation angle detector detects that the rotation shaft has rotated to a predetermined angle, the current supply by the current supply unit is stopped so that the rotation of the rotation shaft is stopped, and the motor is braked. A brake control unit that controls to apply,
A home position detector that detects a home position that is a reference position of the rotating shaft after the operation of the brake controller;
A determination unit that determines whether or not a stop position of the rotating shaft and a target position that is a starting target position when rotating the rotating shaft match after the operation of the brake control unit;
A shift amount determination unit that calculates a shift amount between the stop position of the rotary shaft and the target position based on the home position detected by the home position detection unit if the determination unit determines that they do not match; ,
Based on the deviation amount calculated by the deviation amount determination unit, a current is supplied by the current supply unit so that the stop position of the rotary shaft coincides with the target position, and the rotary shaft is rotated and adjusted. A position adjustment unit;
An image forming apparatus comprising: a brake timing adjustment unit that adjusts a timing of the brake by the brake control unit based on the deviation amount calculated by the deviation amount determination unit.

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