JP4065216B2 - Paper punching device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
Paper punching device that punches paper discharged from copiers, printers, printers, etc. In place Related.
[0002]
[Prior art]
In recent years, there has been a demand for downsizing and cost reduction of devices. In a paper punching device (hereinafter also referred to as a punch unit), a DC brush motor has been used as a punching drive motor with the aim of reducing size and cost. On the other hand, a 2-hole / 3-hole switching punch function and a faster punching time are also required, which tends to deteriorate the stop accuracy, and improving the stop accuracy is an issue.
[0003]
A punch unit using rotational driving as punch power is conventionally known as shown in Patent Document 1. 22 to 24 are diagrams showing the punch unit disclosed in Patent Document 1, FIG. 22 is an exploded perspective view of the main part of the drive unit of the punch unit, FIG. 23 is a plan view of the punch unit, and FIG. 24 is a front view. It is.
[0004]
In these figures, a guide frame 510 is configured as a box-shaped cross-section beam by connecting an upper frame 511 and a lower frame 521 made of a sheet metal having a U-shaped cross section and connecting both ends together with a bolt 526 via a spacer 525. Is done. Two upper guide holes 512 and 512 and lower guide holes 522 and 522 that hold the punch 501 are provided through the upper and lower surfaces 511 a and 521 a of the upper frame 11. The upper and lower guide holes 512 and 522 are subjected to burring by pressing, and the flange 512a of the upper guide hole 512 is located outside the box, and the flange of the lower guide hole 522 is located inside the box. Each is formed upward. The inner diameter of the guide hole is reamed so that the outer periphery of the shaft of the punch 501 slides, and the punch 501 is slidably supported. This improves the guide accuracy because the punch is supported at two points.
[0005]
Two die holes 507 and 507 are provided in a punching position in a U-shaped sheet metal die frame 506 that also serves as a base frame. The die frame 506 and the guide frame 510 are fastened by screws 509 with a paper passing port 505 formed so that the positions of the upper and lower guide holes 512 and 522 correspond to the die hole 507 and sandwiching the spacer 508. One end (left side in FIG. 22) of the upper frame 511 of the guide frame 510 is extended to form a motor mounting plate 513.
[0006]
The slide link 530 is composed of a long rod 531 having a U-shaped cross section of a resin molded body or a light alloy sheet metal for weight reduction. Two side cams 531b having a U-shaped cross section are inclined to the axis of the long rod 531 at two cams. Holes 532 and 532 are provided. A pin 502 is inserted into a through hole provided perpendicular to the axis of the punch 1, a pin roller 503 is fitted into the pin 502, and the pin roller 503 is inserted into the cam hole 532. As a result, when the slide link 530 is driven to move left and right in the figure, the punch 501 supported by the upper and lower guide holes 512 and 522 is moved and driven in the vertical direction in the figure by the linear motion cam mechanism. The outer width of the U-shaped cross section of the long rod 531 of the slide link 530 is slightly narrower than the inner width of the upper and lower beams 511 and 521 of the guide frame 510, and the long rod 531 is within the box-shaped cross section formed by the upper and lower beams 511 and 521. Can be slid.
[0007]
One side of the side plate 531b of the long rod 531 of the slide link 530 is extended to the left side of the drawing to form a drive arm, and a slider groove 537 is provided at an end of the slide link 530 perpendicular to the axis of the long rod 531. One end (left side in FIG. 22) of the upper frame 511 of the guide frame 510 is extended to form a motor mounting plate 513. A motor 541 is fixed to the motor mounting plate 513, and the crank gear 545 is driven to rotate through gears 542, 543, and 544. The crank pin 546 of the crank gear 545 is inserted into the slide groove 537 of the drive arm of the long rod 531 of the slide link 530 to constitute the drive means 540. When the crank gear 545 is rotationally driven by the motor 541, the slide link 530 is driven to move left and right in the drawing by the slide crank mechanism. Accordingly, the punch 501 is driven up and down by the pin 502 engaged with the cam hole 532 to punch the sheet material inserted into the sheet passing port 505. The crank gear 545 is stopped at a fixed position by a limit switch 547 connected to a motor power source (not shown).
[0008]
The cam hole 532 shown in FIGS. 22 and 24 is a cam hole configured by a straight line provided to be inclined with respect to the axis of the slide link. With this linear cam, when the slide link 530 moves at a constant speed, the punch 1 moves at a constant speed from the start of movement to the completion of drilling.
[0009]
[Patent Document 1]
JP-A-2002-337095
[0010]
[Problems to be solved by the invention]
As described in Patent Document 1, there is a 2-hole / 3-hole switching function. As a side effect, the motor driving range at the retracted position of the punch blade (the position where the blade does not protrude from the lower frame) is narrowed. For this reason, if the motor stop accuracy is poor, the punch blade protrudes from the lower frame at the time of stop, resulting in problems in paper conveyance and the like. On the other hand, a stepping motor, a brushless motor, a DC brush motor, or the like is used as a motor as a power source of this type of punch unit. In order to improve the stop position, it is desirable to use a motor that can control the rotation amount, such as a stepping motor, among the above motors. However, a motor that can control the rotation amount, such as a stepping motor, secures a torque necessary for paper punching. This increases the size of the motor and increases the cost. Furthermore, in recent years, with the increase in the speed of post-processing devices, it has become necessary to increase the punching time. This also tends to increase the size and cost of the motor.
[0011]
Accordingly, an object of the present invention is to provide a low-cost paper punching device that is small in size, capable of high-speed processing, and has good motor stop accuracy. Place It is to provide.
[0012]
[Means for Solving the Problems]
To achieve the purpose, The present invention A paper punching device for punching paper that has been carried in, a motor for punching operation, and a motor drive amount detecting means for detecting the drive amount of the motor; From motor drive start to before motor stop operation start A measuring means for measuring time, and a motor driving amount for a predetermined time during the driving of the motor measured by the measuring means at the time of drilling operation is measured by the motor driving amount detecting means, and the measured motor driving amount And a control means for changing the motor stop operation start position.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
<First Embodiment>
FIG. 1 is a diagram illustrating a schematic configuration of a sheet post-processing apparatus according to an embodiment of the present invention, and FIGS. 2 and 3 are diagrams illustrating a schematic configuration of an image forming system including the sheet post-processing apparatus illustrated in FIG. . The form shown in FIG. 2 shows an outline of a system as a copying machine, and includes an image forming apparatus PR, a paper feeding apparatus PF that supplies paper to the image forming apparatus, a scanner SC for reading an image, and a circulating automatic document. It consists of a feeding device ARDF. The sheet on which the image is formed by the image forming apparatus PR is conveyed to the entrance guide plate of the finisher FR via the relay unit CU. FIG. 3 is a schematic diagram of a printer-type system without the scanner SC and the circulation type automatic document feeder ARDF, and other configurations are the same as those of the copying machine. The sheet post-processing device indicated as the finisher FR is attached to the side portion of the image forming apparatus PR as described above, and the paper discharged from the image forming apparatus PR is guided to the paper post-processing device FR, and the rear of the paper Various post-processing are performed by the function of the processing device FR. The image forming apparatus PR may be any apparatus having a known image forming function, such as an apparatus for an electrophotographic image forming process or an apparatus having an inkjet print head. .
[0024]
In a sheet post-processing apparatus FR (hereinafter referred to as reference numeral 2) as a sheet processing apparatus, as shown in FIG. 1, a sheet received from the image forming apparatus PR is used as a punching unit that performs post-processing on one sheet. Branches through an entrance conveyance path A having a punch unit 3, to an upper conveyance path B that leads to a proof tray 18, an intermediate conveyance path C that leads to a shift roller 9, and a lower conveyance path D that leads to a staple tray 10 that performs alignment and stapling. The claw 24, the turn guide 36, the branch claw 25, and the turn guide 37 are configured to be distributed. The paper transported onto the staple tray 10 by the transport rollers 33, 34, and 35 is aligned on the staple tray 10 in a direction perpendicular to the paper transport direction by the jogger fence 12. It is matched to the standard. Thereafter, in the case of end face binding, a stapling process is performed at a predetermined position, the paper is conveyed upward by the discharge claw 11, and is discharged and stacked on the paper discharge tray 17 by the discharge roller 15. FIG. 5 shows an outline of the drive portion of the discharge claw 11, and a drive shaft 103 is connected to the timing pulley 101 on the drive side of the timing pulley 101, 102 around which the discharge belt 14 is wound. The driving force is obtained from the stepping motor 106 through the gear trains 104 and 105 provided on the drive shaft.
[0025]
On the other hand, in the case of saddle stitching, after the sheet bundle is aligned, the bundle is transported downward by the bundle transport roller pair 13a and 13b, and the binding process is performed at the saddle stitching position. When the saddle stitching process is completed, the bundle conveying rollers 26a and 26b carry the sheet to the folding position, the folding plate 19 and the folding roller pair 20 perform the middle folding process, and the middle folding discharge roller 22 performs the middle folding discharge. The paper is discharged onto the paper tray 23 and stacked.
[0026]
A common inlet conveyance path A upstream of the upper conveyance path B, intermediate conveyance path C, and lower conveyance path D has an inlet sensor 301 that detects a sheet received from the image forming apparatus PR, and a conveyance roller 31 downstream thereof. The punching unit 3 and the branching claw 24 and the turn guide 36 are sequentially arranged downstream thereof.
[0027]
The branching claw 24 is held in the state of the solid line in FIG. 1 by a spring (not shown). When the solenoid (not shown) is turned on, the branching claw 24 is rotated counterclockwise in the figure (in the state of the one-dot chain line). If the solenoid is OFF, the paper is distributed to the upper conveyance path B. The branching claw 25 is held in a solid line state in FIG. 1 by a spring (not shown). When the solenoid (not shown) is turned on, the branching claw 25 is rotated clockwise (in a one-dot chain line state), and paper is fed to the intermediate conveyance path C. Distribute. If the solenoid is OFF, the sheet is sent to the lower conveyance path D as it is and conveyed by the conveyance rollers 33 and 34. The turn guides 36 and 37 have a function of helping to sort the paper by the branch claws 24 and 25, respectively. The turn guides 36 and 37 have a function of reducing the sheet conveyance resistance at the small-diameter branching portion by being rotated by the sheet bent in the conveyance direction by the branch claws 24 and 25.
[0028]
The intermediate transport path C is provided with a shift roller 9 that can move the paper by a fixed amount in a direction perpendicular to the transport direction. The shift roller 9 exhibits a shift function by being moved in a direction perpendicular to the transport direction by a driving means (not shown). The sheet sent to the intermediate conveyance path C through the conveyance roller 32 and the turn roller 37 moves by a certain amount in the direction perpendicular to the conveyance direction while being conveyed by the shift roller 9, so that the sheet becomes a certain amount in the direction perpendicular to the conveyance direction. In this state, the paper is discharged by the discharge roller 15 and stacked on the paper discharge tray 17. The timing is determined based on paper detection information of the roller shift sensor 303, paper size information, and the like.
[0029]
A staple tray discharge sensor 305 is provided in the lower transport path D, and serves as a trigger for the alignment operation when the paper is present in the transport path and the paper is discharged to the staple tray 10. The sheets sent to the conveyance path D are sequentially conveyed by the conveyance rollers 33, 34, and 35 and are aligned after being stacked on the staple tray 10.
[0030]
The trailing edge of the sheet discharged to the staple tray 10 is aligned with reference to the trailing edge fence 27 as the first sheet bundle regulating means. The rear end fence 27 is configured to be rotatable around the central axis of the bundle conveying roller 13a as shown in FIG. 6, and the solenoid-side end portion 27a of the rear end fence 27 is driven by the solenoid 70, The tip is retracted from the transport path. Thereby, it is comprised so that conveyance of a sheet bundle may not be prevented.
[0031]
The sheets stacked on the staple tray 10 are dropped down by the hitting roller 8 at any time and the lower ends are aligned. As shown in FIG. 4, which is a perspective view showing the mechanism around the staple tray 10 with the fulcrum 8a as the center, the tapping roller 8 is given a pendulum motion by the tapping solenoid 8s and intermittently applied to the paper fed into the staple tray 10. Acting on the rear end fence 27. The hitting roller 8 is rotated counterclockwise by the timing belt 8t in a direction in which the paper is moved to the trailing edge fence 27. The jogger fence 12 aligns the sheets stacked on the staple tray 10 in the direction perpendicular to the conveyance direction. The jogger fence 12 is driven via a timing belt 12b by a jogger motor 12m capable of forward / reverse rotation shown in FIG. 4, and reciprocates in a direction perpendicular to the paper transport direction. By performing an operation of pressing the end face of the paper by this movement, the paper is aligned at right angles to the transport direction. This operation is performed at any time during loading of sheets and after loading of the final sheet. A sensor 306 provided in the staple tray 10 is a so-called paper detection sensor that detects the presence or absence of paper on the staple tray 10. The tapping roller 8, the rear end fence 27, and the jogger fence 12 constitute an aligning unit that aligns the sheet bundle in a direction orthogonal to a direction parallel to the sheet conveying direction.
[0032]
The bundle conveying rollers 13a, 13b and 26a, 26b can be pressurized and released by the mechanism shown in FIG. 7, and after passing the sheet bundle in the released state, pressurize and convey the sheet bundle. . The bundle conveying rollers 13a, 13b and 26a, 26b can be freely pressed and separated by a pressure release motor 63. The transport rollers 13a, 13b and 26a, 26b are rotationally driven by a stepping motor 50. By controlling the number of rotations of the stepping motor 50, the transport amount of the sheet bundle is controlled. Each of the bundle conveying rollers 13a, 13b and 26a, 26b can be independently pressed and moved apart. Since the pressure release mechanism of each bundle conveying roller is the same, the bundle conveying rollers 13a and 13b will be described in detail.
[0033]
As shown in FIG. 7, the bundle transport rollers 13a and 13b are connected to a drive system so that the rotation directions are opposite and rotate at the same speed. The drive is transmitted to a timing pulley 53 and a gear pulley 54 that are arranged coaxially with the bundle conveying roller 13a using the stepping motor 50 as a drive source. Further, driving is transmitted from the gear pulley 54 to the timing pulley 58 disposed coaxially with the bundle conveying roller 13b via the arm 56 via the idler pulley 55, and the bundle conveying roller 13b rotates. The arm 56 is rotatable about the gear pulley 55 and acts in a direction in which the arm 56 is pressed against the sheet by a tension spring 64 provided on the shaft of the bundle conveying roller 13b. Further, a link 59 is connected to the shaft of the bundle conveying roller 13b, and a long hole 59a is provided on the other side of the link, so that it can freely rotate on a convex portion 60p provided on the circumference of the gear 60. It is fitted. Further, a sensor 61 is provided at one end of the gear 60 for detecting the opened state of the bundle conveying rollers 13a and 13b by the filler 60a. By rotating the stepping motor 63 counterclockwise and clockwise, Release pressure. FIG. 7A shows a pressure release state, and FIG. 7B shows a pressure contact state.
[0034]
The staple unit 5 includes a stitcher portion 5a that strikes a needle and a clincher portion 5b that bends the tip of the needle that is driven into the sheet bundle. In the staple unit 5 in the present embodiment, the stitcher 5a and the clincher 5b are configured separately, and can be moved in a direction perpendicular to the sheet bundle conveyance direction by the stapler moving guide 6, and the stitcher 5a and the clincher 5b are not shown. A relative positioning mechanism and a moving mechanism are provided. The stapling position in the conveyance direction of the sheet bundle is performed by conveying the sheet bundle by the bundle conveyance rollers 13a and 13b. Thus, stapling can be performed at various positions of the sheet bundle.
[0035]
The middle folding mechanism portion is located downstream of the staple unit 5 in the sheet conveyance direction (downstream side when folding the sheet, and lower position). This is composed of a pair of folding rollers 20, a folding plate 19, a stopper 21, and the like until the sheet bundle stapled at the center in the sheet conveying direction in the upstream staple unit 5 hits the stopper 21 by the bundle conveying rollers 13a and 13b. By conveying and temporarily releasing the nip pressure of the bundle conveying roller 13b, the position of the folding reference position of the sheet bundle is determined. Thereafter, the nip pressure of the bundle conveying rollers 26a and 26b is applied to hold the sheet bundle, the stopper 21 moves backward and comes off from the rear end of the sheet bundle, and the necessary distance is determined by the sheet size signal sent from the image forming apparatus main body. It is conveyed and the folding position is put out. The sheet bundle conveyed to the folding position (usually the center in the sheet bundle conveying direction) is pushed into the nip of the pair of folding rollers 20 by the folding plate 19, and the pair of folding rollers 20 presses and rotates the sheet bundle. It is folded more than that. At this time, if the paper size is large, the paper bundle is sent downstream of the stopper 21 in the paper transport direction. Therefore, in this embodiment, the end of the sheet bundle is guided in the horizontal direction by curving the downstream conveyance path from the position where the stopper 21 is provided. With this configuration, it is possible to transport a sheet even if it is a large sheet size, and it is possible to make the size of the sheet post-processing device 2 in the height direction compact.
[0036]
As shown in FIG. 8, the stopper 21 as the second sheet bundle restricting means is configured to be rotatable around the central axis of the bundle conveying roller 26a, and the solenoid-side end portion 21a is moved by the solenoid 72. Driven, the tip 21b is retracted from the transport path. The folded sheet bundle is discharged and stacked on the half-fold discharge tray 23 by the half-fold discharge roller 22. The sensors 310 and 311 at the folded portion detect the presence or absence of paper. In addition, the sensor 313 of the half-folded paper discharge tray 23 detects the presence or absence of a paper bundle on the middle-folded paper discharge tray 23, and counts the number of paper bundles discharged from the state where there is no paper bundle. This is used to detect the fullness of the paper discharge tray 23 in a pseudo manner. The folding end stopper position detection sensor 312 detects the operation of the stopper 21 and the end position of the sheet bundle when the stopper is released.
[0037]
The end face binding operation is shown in FIG. In FIG. 9A, the rear end portion in the paper conveyance direction and the direction orthogonal to the paper conveyance direction are aligned, and the required number of sheets of one copy is aligned. From this state, as shown in FIG. 9 (b), it is caught by the bundle conveying rollers 13a and 13b, and as shown in FIG. 9 (c), the rear end fence 27 moves backward and the staple unit 5 moves to the binding position. As shown in FIG. 9D, the binding operation is performed at the binding position.
[0038]
The operation of saddle stitching is shown in FIG. In FIG. 10A, the rear end portion in the paper transport direction and the direction orthogonal to the paper transport direction are aligned, and the required number of sheets of one copy is aligned. From this state, as shown in FIG. 10B, the sheet is caught by the bundle conveying rollers 13a and 13b, the rear end fence 27 moves backward, and the sheet bundle is conveyed in the direction of the folding plate 19 (downward). Then, the sheet bundle is stopped at the center of the conveyance direction length of the sheet bundle, which is a binding position by the staple unit 5, and is saddle stitched.
[0039]
The saddle-stitched sheet bundle is further conveyed downward as shown in FIG. 10C, positioned after being brought into contact with the stopper 21, and until the binding position reaches the position of the folding plate 19 (folding position). It is further conveyed. Then, as shown in FIG. 10 (d), the sheet bundle is stopped at the position, and the folding plate 10 is projected and pushed into the nip into the folding roller 20. In this way, it can be folded in half at the binding position. If the leading end of the folding plate 19 protrudes to the extent that it contacts the sheet bundle, the staples abut against the folding plate 19 when the folding position is reached, so that the position accuracy of the folding position can be ensured.
[0040]
FIG. 11 shows a control circuit of the sheet post-processing apparatus according to this embodiment together with an image forming apparatus. A main control plate 350 as a control apparatus is composed of a microcomputer centering on a CPU 360, and includes a pulse counter 361 and a timer 362. Each switch of the control panel of the image forming apparatus PR main body, the inlet sensor 301, the upper paper discharge sensor 302, the roller shift sensor 303, the staple paper discharge sensor 305, the staple tray paper presence / absence sensor 306, and the discharge claw position detection sensor. 307, a paper discharge sensor 308, a paper surface detection sensor 309, a folding unit paper presence / absence detection sensor 310, a folding roller arrangement detection sensor 311, a folding end stopper position detection sensor 312, a paper presence / absence detection sensor 313, and the like. Is input. The CPU 360 controls various motors 372 and 373 and solenoids 374 and 375 based on the input signal. Further, the punch unit 3 also performs punching according to the instruction of the CPU 360 by controlling the clutch and the motors 381, 382, and 383 according to the input from the sensor and the switch 385 via the punch relay board 380.
[0041]
The sheet post-processing device 2 is controlled by the CPU 360 executing a program written in a ROM (not shown) while using the RAM as a work area.
[0042]
Hereinafter, the punch unit portion of the present invention will be described.
FIG. 12 is a perspective view showing the appearance of a punch unit according to an embodiment of the present invention, FIG. 13 is a side view, FIG. 14 is an enlarged view of the vicinity of the punch motor, and FIG. 15 is an enlarged view of a drive transmission mechanism. Show.
[0043]
As shown in FIG. 12, in this example, it is a punch unit capable of punching with 2 holes (3-1) and 3 holes (3-2), drilling with 2 holes or 3 holes, and The driving mechanism at that time is equivalent to the invention described in Patent Document 1 described above, and is a known technique, and therefore description thereof is omitted here.
[0044]
The sheet conveyed to the sheet post-processing apparatus 1 enters the punch unit 3 through the gap 3-11 in FIG. 13, and a punching operation is performed. A DC brush motor (punch motor) 3-6 as a DC motor shown in FIG. 14 is a driving source for drilling. When the DC brush motor 3-6 rotates, the gear 3-8 and the crank gear 3-9 shown in FIG. 15 rotate, and the slide link 3-10 slides left and right. With the slide of the slide link 3-10, the punch blade 3-1 or 3-2 moves up and down to perform a punching operation. As a mechanism for transmitting the slide to the vertical movement of the punch, for example, a known mechanism described in Patent Document 1 is used.
[0045]
When the DC brush motor 3-6 shown in FIG. 14 rotates, the encoder 3-5 attached on the shaft of the DC brush motor 3-6 rotates, and the output of the pulse count sensor 3-3 changes. As shown in FIG. 11, the output of the sensor 385 is input from the pulse input port of the CPU 360 and counted by a pulse counter 361 in the CPU 360. The home position filler 3-7 is mounted on the shaft of the crank gear 3-9, and the punch blade 3-1 or 3-2 is in the home position (a position where the punch blade does not protrude from the lower frame into the gap 3-11). The home position sensor 3-4 is mounted so as to detect the notch of the home position filler 3-7. There are a total of two notches in the home position filler 3-7 at positions facing each other by 180 °, both of which are positions where the punch blades do not protrude from the lower frame into the gap 3-11.
[0046]
When the punch blade 3-1 or 3-2 is in the home position state and the home position filler 3-7 is rotated halfway and stopped, either the punch blade 3-1 or 3-2 is perforated according to the rotation direction. The operation (vertical movement) is performed and the home position is restored. When the DC brush motor 3-6 is rotated in the opposite direction from the previous state from this state, the same punch blade (3-1 or 3-2) as the previous time performs the punching operation again. When the DC brush motor 3-6 is rotated in the same direction as the previous time, a punch blade (3-1 or 3-2) different from the previous time performs a punching operation.
[0047]
The biggest problem when the DC brush motor 3-6 is used as a power source is poor stop accuracy. When stopping operation from punching under exactly the same control, the stop position varies greatly due to variations in motor characteristics, drive voltage, punched paper thickness, mechanical load between units, etc. . If the stopping accuracy is poor, the punching blade will be disengaged from the home position at the time of stopping, causing problems in paper conveyance and the like.
[0048]
Therefore, in the present embodiment, control is performed as follows.
[0049]
The time measurement is started by the timer 362 in the CPU 360 immediately after the rotation of the motor in the drilling operation. At the same time, the pulse counter 361 in the CPU 360 starts pulse counting. When the home position filler 3-7 rotates with the rotation of the DC brush motor 3-6, the home position sensor 3-4 detects the notch of the home position (home position OFF). The pulse count number at this time is stored in the memory Ps (RAM 363) in the CPU 360. By doing so, it is possible to know the number of count pulses from the home position OFF, that is, the position of the punch blade 3-1 or 3-2 in the vertical direction at any time thereafter. If the count pulse number at a certain time is P, the count pulse number from the home position OFF is P-Ps.
[0050]
Next, the number of pulse counts when the elapsed time immediately after the rotation of the motor in the punching operation reaches the specified time Tr is stored in the memory Ptr (RAM 363) in the CPU 360. When the motor speed increases due to a high drive voltage (near the upper limit within the power supply specification tolerance) or a thin perforated sheet, the stop position tends to overrun the target. At this time, the Ptr value increases. Conversely, when the motor speed is slow due to low driving voltage (near the lower limit within the power supply specification tolerance) or thick perforated paper, the stop position tends to be closer to the target. At this time, the Ptr value becomes small. Therefore, the brake start position is corrected so as to be as close as possible to the target stop position at any time. When the Ptr value is large, the stop position tends to overrun with respect to the target as described above, so the brake start position is advanced. Conversely, when the Ptr value is small, the stop position tends to come closer to the target, so the brake start position is delayed.
[0051]
An example of the calculation formula for the brake start position is shown below.
When the pulse count value at the brake start position is Pb, the count pulse number from the home position OFF is Pb-Ps. When the Ptr value is large, the brake start position is advanced, and when the Ptr value is small, the brake start position is delayed. To
Pb−Ps = Pd−K × Ptr
Is guided. Therefore,
Pb = Pd + Ps−K × Ptr (1)
Pb: Pulse count value immediately after the start of motor rotation at the brake start position
Pd: Specified number of pulses
Ps: Pulse count when the home position is OFF
K: Correction coefficient
Ptr: Number of pulse counts when Tr elapses after driving the motor
It becomes.
[0052]
In the example, Ptr is a pulse count number when Tr elapses after driving the motor, but may be, for example, “a pulse count number between Tr1 and Tr2 after motor driving”. In this case, it is preferable to determine the optimum condition for the best stopping accuracy from experimental values. The prescribed time Tr may be determined by the unit, motor characteristics, etc., but in this embodiment, it is about 30 ms.
[0053]
From the standpoint of stopping accuracy, the motor brake operation is preferably a short-circuit brake (two terminals of the DC brush motor 3-6 (same as 383) are short-circuited by the motor driver 384 shown in FIG. 11). However, the perforation time can be shortened by stopping the reverse brake for a certain period of time and then performing a short-circuit brake operation after a certain period of time. When each time measurement and the start of the brake operation are used as much as possible, the stop accuracy of the CPU 360 is further improved.
[0054]
Further, it is preferable that the optimum values of the prescribed pulse number Pd and the correction coefficient K are determined from experimental values according to the unit, motor characteristics, and the like.
[0055]
The control procedure at this time is shown in the flowchart of FIG.
[0056]
In this procedure, first, the rotation direction flag of the punch motor 3-6 is checked (step S101). If the rotation direction flag (a flag indicating a preset direction (positive direction)) is set, the punch motor 3-6 is checked. Is rotated forward (step S102), if not standing, the punch motor 3-6 is rotated reversely (step S103), the time is measured immediately after the motor rotation, and pulse counting is started (step S104). Then, when the home position sensor 3-4 detects the notch edge of the home position and the home position sensor is turned off (step S105), the count value of the pulse counter 361 is stored in the memory Ps (step S106).
[0057]
Next, when the elapsed time immediately after the motor rotation of the drilling operation started in step S101 reaches the specified time Tr (step S107), the pulse count value at that time is stored in the memory Ptr in the CPU 360 (step S108). Then, as described above, the brake start pulse number Pb is calculated based on the equation (1) (step S109). When the pulse count value reaches Pb (step S110), the motor brake is applied (step S111). Accordingly, when the Ptr value is large, the brake start position can be advanced, and when the Ptr value is small, the brake start position can be delayed. When the punch motor 3-6 is stopped by the operation of the motor brake (step S112), the rotation direction flag of the punch motor 3-6 is reversed (step S113), and this process is finished.
[0058]
By adopting a DC brush motor as the punch motor (drilling drive motor) 3-6 and controlling it in this way, it is possible to improve the motor stop accuracy, and as a result, achieve small size, high speed and low cost. Can do.
[0059]
<Second Embodiment>
Hereinafter, the second embodiment will be described. Since this embodiment is different in the control procedure from the first embodiment, only the differences will be described. In addition, the same reference numerals are assigned to the same parts as those in the first embodiment, and duplicate descriptions are omitted.
[0060]
In this embodiment, the stop position is corrected by the initial process, and the punching operation is performed according to the corrected position. In this embodiment, when the home position filler 3-7 rotates with the rotation of the DC brush motor 3-6 during the initial operation and the punching operation, the notch edge (home position OFF) of the home position is set to the home position sensor 3-4. Will detect. At the same time, the pulse counter 361 in the CPU 360 starts pulse counting. Thereby, the count pulse number P from the home position OFF, that is, the vertical position of the punch blade 3-1 or 3-2 can be known at any time thereafter.
[0061]
During the initial operation, when the count pulse number P reaches the specified value Pbi, the DC brush motor 3-6 is braked to stop the motor. A value Pdf obtained by subtracting the count pulse number P when the motor is stopped from the target stop pulse number is stored in a memory (RAM 362) Psp in the CPU 360. When the target stop position is overrun, Psp has a negative value, and when the target stop position is stopped before, Psp has a positive value.
[0062]
As described in the first embodiment, when the motor speed increases due to a high drive voltage (near the upper limit within the power supply specification tolerance), a light load (variation between machines), or the like, the stop position is It tends to overrun against the target. At this time, the Psp value becomes small (minus). Conversely, if the motor speed is slow due to low drive voltage (near the lower limit of the power supply specification tolerance) or heavy drive load (variation between machines), the stop position tends to be closer to the target. become. At this time, the Psp value increases (plus). Therefore, the brake start position is corrected so as to be as close as possible to the target stop position at any time.
[0063]
When the Psp value is small, the brake start position is advanced. Conversely, when the Psp value is large, the brake start position is delayed.
[0064]
An example of the calculation formula for the brake start position is shown below.
In this embodiment, when the pulse count value at the brake start position is Pb, the brake start position is advanced when the Psp value is small, and the brake start position is delayed when the Psp value is large.
Pb = Pd + K × Psp (2)
Use the following formula. in this case,
Pb: Pulse count value from home position OFF of brake start position
Pd: Specified number of pulses
K: Correction coefficient
Psp: Correction value
It becomes.
[0065]
The control procedure at this time is shown in FIGS.
FIG. 17 is a flowchart showing the control procedure of the initial operation when performing the control. In this control, the punch motor 3-6 is rotated (step S201), the home position sensor is turned on (step S202) and turned off, and when the home position is detected (step S203), the encoder 3-5 counts. Is started (step S204). When the pulse count value exceeds the specified value Pbi (step S205), the punch motor 3-6 is braked (step S206). When the punch motor 3-6 stops, the memory (RAM 362) Psp in the CPU 360 is stopped. A value obtained by subtracting the number of count pulses at the time of stop from the target number of stop pulses is entered (step S208), and the initial process is completed.
[0066]
When the initial process is finished, the punching operation shown in FIG. 18 is started. In the punching operation, first, the punch motor 3-6 rotation direction flag is checked (step S301). If the punch motor 3-6 is on the forward rotation side, the punch motor 3-6 is rotated forward (step S302). Rotate (step S303). When the home position sensor 3-4 is turned off and the home position is detected (step S304), the pulse count of the encoder 3-5 is started (step S305). Next, the brake start pulse number Pb is calculated based on the equation (2) (step S306). When the pulse count value reaches Pb (step S307), the pulse motor 3-6 is braked (step S308). When the pulse motor 3-6 stops (step S309), the punch motor rotation direction flag is reversed (step S310), and the process ends.
[0067]
According to the present embodiment, even if the stop position of the motor changes, correction is performed at the time of initialization, so that the motor stop accuracy can be improved.
[0068]
In addition, each part which is not demonstrated especially is comprised equivalent to 1st Embodiment, and functions equivalently.
[0069]
<Third Embodiment>
In addition to the drive voltage, drive load, etc., the stop position may change due to the thickness of the punched paper, the temperature characteristics of the motor, and the like. In this case, it is not sufficient to use only the initial correction value. Therefore, the brake start position is corrected at every drilling operation including the initial operation so as to be as close as possible to the target stop position.
[0070]
In this embodiment, the value Pdf obtained by subtracting the count pulse number P when the motor is stopped from the target stop pulse number is calculated not only at the initial time but also at every perforation drive. Pdf is added to the previous Psp and stored again in the memory Psp in the CPU. As a result, correction can always be performed from the latest correction information.
[0071]
Since this embodiment is different only in the control procedure from the second embodiment, only the differences will be described. In addition, the same reference numerals are assigned to the same parts as those in the first embodiment, and duplicate descriptions are omitted.
[0072]
FIG. 19 is a flowchart showing the control procedure of the third embodiment. This third embodiment is characterized in that the process of step S320 is inserted between step S309 and step S310 of the second embodiment. That is, when the motor stops in step S309, in step S302, the value Pdf obtained by subtracting the count pulse number P when the motor stops from the target stop pulse number is added to the memory (RAM 362) Psp in the CPU 360, and The added value is stored in the memory Psp. That is,
Psp + (Target stop pulse number-Stop count pulse number)
Is stored in the memory (RAM 362) Psp in the CPU 360. Thereafter, the rotation direction flag of the punch motor 3-6 is reversed (step S310), and the process is terminated.
[0073]
In addition, each part which is not demonstrated especially is comprised equivalent to 1st and 2nd embodiment, and functions equivalently.
[0074]
According to the present embodiment, the brake start position is corrected at every drilling operation including the initial operation, so that the motor stop accuracy can be further improved than in the second embodiment.
[0075]
<Fourth Embodiment>
In the third embodiment, even when the stop position suddenly deteriorates due to noise or the like, Psp is updated, so that the next drilling operation may not be performed correctly. In order to avoid this, in the fourth embodiment, the average of the stop position of the drilling operation at an arbitrary number of times is taken, and the motor stop operation of the drilling operation after the next time is changed.
[0076]
Specifically, the average value of Pdf 10 times before is calculated, the calculated value is stored in Psp, and correction is performed based on the value stored in Psp. This makes it less susceptible to sudden deterioration in stopping accuracy. Further, if the average value is calculated by removing the maximum value and the minimum value from 10 times, the average value is less susceptible to sudden deterioration of stop accuracy.
[0077]
Since this embodiment is different only in the control procedure from the second embodiment, only the differences will be described. In addition, the same reference numerals are assigned to the same parts as those in the first embodiment, and duplicate descriptions are omitted.
[0078]
FIG. 20 is a flowchart showing the control procedure of the fourth embodiment. This third embodiment is characterized in that step S306 of the second embodiment is changed to step S306a, and the process of step S330 is inserted between step S309 and step S310. That is, in step S306a, the correction value Psp is subjected to hydrochloric acid of the above equation (2) on the average of the previous 10 (target stop pulse number−stop count pulse number), and when the motor stops in step S309, (Stop pulse number−count pulse number at stop) is stored (step S330), the punch motor rotation direction flag is inverted (step S310), and the process is terminated.
[0079]
In addition, each part which is not demonstrated especially is comprised equivalent to 1st, 2nd and 3rd embodiment, and functions equivalently.
[0080]
According to this embodiment, since the average of the stop position of the drilling operation is taken at an arbitrary number of times and the motor stop operation of the drilling operation after the next time is changed, the stop position suddenly changes due to noise or the like. However, the next drilling operation can be performed accurately.
[0081]
<Fifth Embodiment>
When the motor speed changes depending on the temperature characteristics of the motor and the stop position varies, there is still a problem even if the above correction is performed. It is good if the time interval from the initial operation to the first punching operation or from the end of the job to the start of the next job is short, but if the time has passed, the motor temperature may have changed. When the motor stop accuracy depends on the motor temperature, the first punching operation after a long time cannot be corrected well.
[0082]
In order to avoid this problem, the punching operation is performed in the absence of a sheet immediately before receiving the first sheet of an arbitrary job, and the motor stop operation of the first punching operation is changed depending on the stop position. As a result, correction can always be performed from correction information at the same temperature. The arbitrary job may be, for example, a job when time T or more has elapsed from the end of the previous job, or may be performed for each successive job.
[0083]
FIG. 21 is a flowchart showing the control procedure of the fifth embodiment. In the fourth embodiment, first, it is checked whether or not the punch punching mode has been started (step S401), and if it is the punch punching mode, it is checked whether or not it is just before receiving the first sheet (step S402). . If it is just before reception, punch punching operation is performed without paper, and the stop position is measured (step S403). If the sheet reaches the punch punching position (step S404), the punching unit 3 executes a punching operation (step S405). At that time, the punch position is corrected and the stop position is measured. The operations from step S404 are repeated, and these operations are executed until the punch mode ends.
[0084]
In addition, each part which is not demonstrated in particular is comprised equivalent to 1st thru | or 4th embodiment, and functions equivalently.
[0085]
According to the present embodiment, the punching operation is performed in the absence of a sheet immediately before receiving the first sheet of an arbitrary job, and the motor stop operation of the first punching operation is changed depending on the stop position. As a result, correction can always be performed from the correction information at the same temperature, and the drilling accuracy can be ensured regardless of the temperature change.
[0086]
【The invention's effect】
As described above, according to the present invention, Correction of motor drive during time measurement becomes possible, and motor stop accuracy becomes better. Small And high speed Achieved can do.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a schematic configuration of a sheet post-processing apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram showing a schematic configuration of an image forming system (copier mode) including the sheet post-processing apparatus shown in FIG.
FIG. 3 is a diagram showing a schematic configuration of an image forming system (printer form) including the sheet post-processing apparatus shown in FIG. 1;
FIG. 4 is a perspective view showing a mechanism around a staple tray.
FIG. 5 is a diagram showing an outline of a drive unit for a discharge belt and a discharge claw.
FIG. 6 is a view showing a drive mechanism of a rear end fence.
FIG. 7 is a diagram illustrating a contact and separation mechanism and operation of a bundle conveying roller.
FIG. 8 is a diagram illustrating a stopper driving mechanism.
FIG. 9 is a diagram illustrating an end face binding operation.
FIG. 10 is a diagram illustrating a saddle stitching operation.
FIG. 11 is a block diagram showing a control circuit of the sheet post-processing apparatus according to the present embodiment together with the image forming apparatus.
FIG. 12 is a perspective view showing an appearance of a punch unit according to an embodiment of the present invention.
13 is a side view of FIG.
FIG. 14 is an enlarged view in the vicinity of the punch motor.
FIG. 15 is an enlarged view of a drive transmission mechanism portion of the punch unit.
FIG. 16 is a flowchart showing a control procedure according to the first embodiment.
FIG. 17 is a flowchart showing a control procedure of an initial operation according to the second embodiment.
FIG. 18 is a flowchart showing a control procedure of a drilling operation according to the second embodiment.
FIG. 19 is a flowchart showing a control procedure of a drilling operation according to the third embodiment.
FIG. 20 is a flowchart showing a control procedure of a drilling operation according to the fourth embodiment.
FIG. 21 is a flowchart showing a control procedure of a drilling operation according to the fifth embodiment.
FIG. 22 is an exploded perspective view showing a main part of a punch unit according to a conventional example.
23 is a plan view of the punch unit shown in FIG. 21. FIG.
24 is a front view of the punch unit shown in FIG. 21. FIG.
[Explanation of symbols]
1 Image forming device
2 Recording paper post-processing device
3 Punch unit
3-1 2-hole punch
3-2 3-hole punch
3-3 Pulse count sensor
3-4 Home position sensor
3-5 Encoder
3-6 DC brush motor
3-7 Home position filler
3-8 Gear
3-9 Crank gear
3-10 Slide link
3-11 Gap
350 Controller
360 CPU

Claims (1)

In a paper punching device that punches paper that has been carried in,
A motor for drilling operation;
Motor drive amount detection means for detecting the drive amount of the motor;
Measuring means for measuring the time from the start of motor drive to the start of motor stop operation ;
Control for measuring a motor drive amount for a predetermined time during the driving of the motor measured by the measuring means during the drilling operation by the motor drive amount detecting means, and changing a motor stop operation start position according to the measured motor drive amount. Means,
A paper punching device comprising:

Images