JP4227703B2 - Punch unit for punching sheet material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a sheet material punching punch unit for punching a binding hole for filing on a sheet copied with a copying machine or the like, and is used in synchronization with a copying operation by being mounted on an office machine such as a copying machine. It relates to the punch unit.
[0002]
[Prior art]
For punching the binding holes to file the sheet material such as copied paper, conventional paper has been manually aligned and punched by manual punch. However, recently, a copy unit has been built into the copier due to the demand for automation. Thus, an apparatus for mechanically punching a plurality of binding holes has been used. As such a punch unit, a reciprocating punch unit (for example, Japanese Utility Model Laid-Open No. 5-29700, Japanese Patent Application Laid-Open No. 10-180693, etc.) for inserting and punching a linearly moving punch into a die hole, A rotary punch unit (for example, Japanese Utility Model Laid-Open No. 63-154199, Japanese Patent Application Laid-Open No. 6-79697, Japanese Patent Application Laid-Open No. No. 136992 and Japanese Patent Laid-Open No. 10-249797). Further, a rotary punch unit (Japanese Patent Laid-Open No. 60-16399, etc.) for punching by pressing a rotating punch against the surface of an elastic roller is disclosed.
[0003]
The latter rotary punch unit is easy to pierce flying while moving the perforated sheet material, so it is widely used by incorporating it into office machines such as copiers. In the rotary punch unit, if the assembly of the rotating punch and the die hole is not accurate, there is an inconvenience that a fine hole cannot be formed due to a burr or the like in the drilled hole. On the other hand, the former reciprocating punch unit has the advantage that it can be easily perforated easily because the fixed die hole and punch are combined.
[0004]
[Problems to be solved by the invention]
However, since this reciprocating punch unit is difficult to punch at high speed, it takes a long time to stop the sheet material at the time of punching. Therefore, the punching unit does not reach flying punching, which punches while moving the punched sheet material. Accordingly, there has been a demand for a punch unit that can increase the drilling speed of the reciprocating punch unit and perform high-speed drilling similar to flying drilling.
[0005]
In order to perform high-speed punching that approximates flying punching with a reciprocating punch unit, the punching speed of the punch is increased and the sheet material feeding and punching time are reduced so as to shorten the stop time of the punched sheet material during punching. It is necessary to synchronize the drilling operations rapidly. On the other hand, in the conventional reciprocating punch unit, a clutch is provided between the cam shaft and the drive motor, and punch driving is performed by switching the clutch, so that the response speed is low and it is difficult to respond at high speed. On the other hand, if a drive device using a step motor or the like is used, the speed can be increased, but there is a problem that the cost increases and it is not possible to meet the demand for an inexpensive punch unit.
[0006]
An object of the present invention is to solve the above-mentioned problems and to provide a punch unit for punching a sheet material that is inexpensive and capable of high-speed punching.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present inventors have focused on the fact that the punching speed can be increased by directly connecting a high-speed DC motor without using a clutch for driving the punch. Thereby, the stop time of the perforated sheet material at the time of punching can be reduced to 0.1 sec or less, and high-speed punching by a reciprocating punch unit can be performed at low cost. In addition, a sheet material feed and punch drive control unit integrated with the punch unit has been developed, enabling high-speed punching at low cost.
[0008]
The punch unit for punching a sheet material according to the present invention is a punch unit for punching a reciprocating sheet material comprising a punch reciprocally driven by a rotating cam and a die for punching a sheet material in cooperation with the punch. wherein a cam shaft having a cam, and a DC motor for driving the cam shaft, an encoder for detecting the rotational position of the cam shaft, a sheet conveying means for conveying the sheet material, and the DC motor by a signal of the encoder Control means for controlling the sheet conveying means, and the encoder is provided with a first disk corresponding to the first disk and a first disk in which a range of an angle corresponding to a standby position of a punch mounted on the camshaft is cut out. A first encoder that has one photosensor to detect whether the punch tip position is in the standby position, a second disk that has a number of transmission windows slit therein, and a second disk that corresponds to the second disk. And a sensor is characterized in that composed of the second encoder for detecting the punch tip position moving from the rotation angle of the cam shaft.
[0009]
The punch unit for punching a sheet material according to the present invention detects the position of the punch by an encoder that detects the rotational position of the cam shaft, and starts the punch operation before the conveyed sheet material stops. It is desirable to provide control means for controlling the DC motor and the sheet conveying means so that the sheet material conveyance is started before the sheet stops.
[0010]
That is, the punch unit of the present invention includes an encoder that detects the rotational position of the camshaft, detects the position of the punch in operation, and controls the introduction and discharge of the sheet material at a predetermined position. Therefore, the relationship between the position of the punch during the punching operation and the feeding of the sheet material can be finely controlled. As a result, a high-speed drilling process similar to flying drilling can be performed even in a reciprocating punch unit.
[0011]
Further, since the reciprocating punch unit must stop and punch the sheet material to be punched, it is more disadvantageous than the rotary punch unit for incorporation in office equipment that requires high-speed processing. The punch unit of the present invention detects the punch position during operation by the encoder, starts punching before the conveyed sheet stops, punches almost simultaneously with the stop of the sheet material, and the punch waits after punching Since the movement of the punch and the feeding of the sheet material are linked so that the sheet material conveyance is started before the operation is stopped after returning to the position, the sheet material stop time at the time of punching is shortened. This solves the above disadvantages and performs a high-speed drilling operation similar to flying drilling.
[0012]
In order to perform the above operation, the punch unit of the present invention uses an inexpensive high-speed DC motor without using an expensive pulse motor, so that high-speed drilling can be performed at low cost. In particular, unlike the conventional punch unit, the punch unit of the present invention directly rotates the camshaft by a high-speed DC motor without using a clutch (same as that through a driving means such as a gear), so that the response speed Fast and high-speed drilling is possible.
[0013]
In order to control the above-described operation, a sheet conveying unit including a supply roller that supplies the sheet material to the punch and a discharge roller that discharges the sheet material, and a paper end detection unit that detects the paper end of the supplied sheet material And a sheet position detecting means for detecting a rotation angle of the supply roller, and the sheet position detecting means detects the punching position of the sheet material and before the conveyed sheet material stops. It is desirable to provide a control means for controlling the DC motor and the sheet conveying means so as to start the punch operation and start the sheet material conveyance before the punch stops after punching.
[0014]
That is, first, the supply roller rotates and the sheet material is supplied to the unit. When the paper edge of the conveyed sheet material is detected by the paper edge detection means, and the supply roller further rotates a predetermined angle from this position, the punching position of the sheet material is positioned at the punch position. Alternatively, the position where the supply roller rotates by a predetermined angle from the detection position, and the sheet edge of the sheet material passes through the roller and the movement of the sheet material stops is determined as the punching position. In any case, if the paper edge is detected by the paper edge detection means, the rotation angle of the supply roller from this detection position is detected by the rotation detection means, and the punch is driven at a predetermined rotation angle, the above-mentioned can be simply performed. High-speed drilling operation similar to the flying drilling can be performed.
[0015]
In the present invention, the encoder includes a first encoder that detects whether the punch tip position is at the standby position, and a second encoder that detects the punch tip position that moves from the rotation angle of the cam shaft .
[0016]
Further, in the present invention, the first encoder includes a disc (first disc) in which a range of an angle corresponding to a standby position of a punch mounted on a camshaft is cut out, and a photosensor (first disc) corresponding to the disc. shall have a photosensor) and a disk and the second encoder in which a large number of transparent window is slit and (second disc), the photosensor (second photo sensor corresponding to the circular plate) and having a And
[0017]
That is, the first encoder detects whether or not the punch position is at the standby position, and when the position where the punch is stopped is not at the standby position, the first encoder returns the punch to the standby position at the time of driving. The second encoder detects the position of the punch during the punching operation, drives and controls the sheet conveying means based on a signal at a predetermined position, and detects the deviation of the punch stop position to finely adjust the punch stop position. It is.
[0018]
For example, when a power failure or punch lock occurs and the punch stops at a point other than the standby position, the position of the stopped punch cannot be determined by the second encoder alone, and a malfunction may occur when restarting. In such a case, by providing a first encoder that detects whether or not the punch tip position is in the standby position, the first encoder detects that the punch is not in the standby position when restarted, and passes through the control means. The DC motor is driven to move the punch to the standby position. Accordingly, even in such a case, accurate control can be performed without causing malfunction.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of a punch unit for punching a sheet material according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a flowchart showing the operation of a punch unit for punching sheet material according to an embodiment of the present invention, FIG. 2 is a conceptual diagram showing the overall arrangement of the punch unit for punching sheet material of the present invention incorporated in an office machine, and FIG. 4 is an exploded perspective view of the punch unit main body according to the embodiment, FIG. 4 is a front view showing details of the punch drive and control unit of the embodiment of the present invention, FIG. 5 is a side view of FIG. It is a block diagram of the unit control means of the punch unit for material punching.
[0020]
First, the configuration of the punch unit main body will be described with reference to FIG. Two punch guides 6 and 6 for guiding the punch 5 to the drilling position are fixed to the middle side of the U-shaped sheet metal punch guide bracket 7 which also serves as a frame. The sheet metal die bracket 8 provided with two die holes 8a, 8a at the drilling position is fixed to the punch guide placket 7 by the rivet 9 so that a paper passage gap is formed between the die guide bracket 7 and the punch guide bracket 7. Has been.
[0021]
A camshaft assembly 1 for reciprocating a punch includes a camshaft 2 having a pair of eccentric cams 3 and 3 at both ends, and a punch holder 4 to which two punches 5 and 5 are attached. A pair of bearings 7 a, 7 a are fitted into both ends of the cam shaft 2, and the bearings 7 a at both ends are fitted into bifurcated bearing metal holes 7 b provided at the rising portions at both ends of the punch guide bracket 7. It is fixed to the punch guide bracket 7 by a ring. One end 2a of the cam shaft 2 is connected to punch driving means shown in detail in FIGS.
[0022]
The punch holder 4 forms a beam having a groove-shaped cross section, and two pins inserted between the long holes 4b provided in both flange portions of the groove-type beam are passed through the holes provided in the head of the punch 5. The punch 5 is suspended. Moreover, the cam follower part 4a formed in window shape is provided in the both ends of the punch holder 4, and the cam shaft 2 is penetrated so that the eccentric cams 3 and 3 may be accommodated in the window-like part of this cam follower part 4a. .
[0023]
As shown in FIGS. 4 and 5, the end 2a of the cam shaft 2 is rotationally driven by a cam drive motor 11 of a DC motor via a pinion 12 and gears 13a, 13b, 14 fixed to the motor shaft. It has become.
[0024]
A first encoder 21 and a second encoder 22 are fixed to the camshaft 2. A first photointerpreter 24 and a second photointerpreter 25 are provided on the punch guide bracket 7, and the laser beam passing through the slits of the first and second encoders 21 and 22 is pulse-counted.
[0025]
As shown in FIG. 5, the first encoder 21 is made of a disc having a notch 21a in a portion corresponding to the punch standby position, and detects whether the punch is in the standby position. When the punch is stopped at a position other than the standby position, it is detected that the laser beam is shielded at a portion having no notch on the circumference and is not at the standby position. When restarted in this state, the camshaft is driven, and when the punch comes to the standby position, the notch 21 comes to the position of the first photointerpreter 24 and light passes therethrough so that the punch is located at the standby position. This is detected, and a stop signal is issued to the cam drive motor 11. As a result, for example, when a power failure or punch lock occurs and the punch stops at an intermediate position, when restarted, the first encoder detects the punch position and drives the camshaft motor 11 via the control means to perform punching. Control to move to the standby position and wait.
[0026]
As shown in FIG. 5, the second encoder 22 is a disk having a large number of slits on the circumference, and detects the precise position of the punch by finely measuring the rotation angle of the cam shaft. The precise position of the punch is detected by counting the laser beam transmitted through the slit.
[0027]
The operation of the unit main body having the above configuration will be described below. When the cam shaft 2 is rotationally driven by the cam drive motor 11, the punch 5 is guided to the punch guide 6 through the eccentric cam 3 and the punch holder 4, and is driven to reciprocate. The punch guide bracket 7 cooperates with the die hole 8a. And a sheet material (not shown) inserted in the sheet passing gap between the die bracket 8 and the die bracket 8. When the cam shaft 2 further rotates after completion of the drilling, the cam follower 4a of the punch holder 4 is provided so as to wrap the eccentric cam 3, so that the punch holder 4 moves upward to move the punch 5 to the standby position.
[0028]
Next, the entire arrangement of the punch units of the present invention incorporated in the office machine will be described with reference to FIG. A paper feed roller 32 and a paper discharge roller 33 are disposed before and after the punch unit main body 10. A paper feed roller 32 (rotation detecting means) 23 that counts the rotation angle of the roller is provided on the paper feed roller 32 that is rotationally driven by a drive means (not shown). On the inlet side of the paper feed roller 32, a paper edge detecting means (sheet position detecting means) 31 for detecting the trailing edge of the sheet material is provided. Various means such as a photocell can be used as the paper edge detecting means 31. The perforated sheet material is transferred so as to be introduced into the unit main body by the rotation of the paper supply roller 32, and the rear end of the transferred sheet material is detected by the paper end detection means 31. When the paper feed roller 32 rotates by a predetermined angle from this detection position, the trailing edge of the sheet material passes through the paper feed roller 32, and the driving force of the roller disappears and the sheet material stops. Therefore, the stop position of the sheet material can be detected by counting the roller rotation angle after the paper edge detection by the paper feed roller encoder 23. If the paper feed roller 32 and the punch unit main body 10 are disposed so as to punch at this stop position, the sheet material can be punched at a predetermined position.
[0029]
The paper discharge roller 33 includes a drive roller 33a that is rotationally driven placed under the sheet passing surface, and a peristaltic roller 33b that is rotatably supported at the tip of a swinging arm 34 (pressure contact means). When the arm 34 is swung and the sheet material placed on the driving roller 33a is sandwiched and pressed, the sheet material is conveyed in the discharging direction by the rotation of the driving roller 33a.
[0030]
As shown in the block diagram of FIG. 6, the control means 20 includes a punch control unit 15 comprising a cam drive motor 11, first and second encoders 21 and 22, a paper edge detection means 31, a paper feed roller encoder (paper feed). (Roller rotation detecting means) 23, a paper feed roller 32, a paper discharge roller 33, and a CPU 26. The CPU 26 receives a signal on the office machine side, for example, a copy end signal of a copier, and the CPU 26 receives a copy control signal. 15 and the conveyance control unit 16 are controlled.
[0031]
The operation of the punch unit having the above configuration will be described below with reference to the flowchart of FIG. 1 and FIGS. 2 and 6. When copying of an office machine in which the punch unit main body is incorporated, for example, a copying machine, is finished, a sheet material is fed from the copying machine to the paper feed roller 32, and a copy end signal is sent to the CPU 26 (STEP 1). In response to this signal, the CPU 26 drives the paper feed roller 32 to introduce the sheet material S into the unit main body 10 (STEP 2). When the sheet material S is transferred and the trailing edge reaches the position of the paper edge detecting means 31, the trailing edge of the sheet material is detected (STEP 3).
[0032]
Further, when the sheet feeding roller 32 is rotated and the sheet material is rotated to a rotation angle at which the trailing edge of the sheet material is separated from the sheet feeding roller 32, the sheet material is stopped (STEP 6). Then, the stop position of the sheet material can be detected. If the position at which the sheet material is punched at the stop position is positioned at the punch position, accurate punching can be performed easily.
[0033]
In the present invention, first, a predetermined rotation angle before the rotation angle for stopping the sheet material is set. Then, the set rotation angle of the paper feed roller 32 is counted by the paper feed roller encoder 23 (STEP 4). Therefore, at this position, the sheet material still moves without stopping. When the cam drive motor 11 is turned on and the cam shaft 2 is rotationally driven at the set rotation angle before the sheet material stops, the punch starts to descend from the standby position (STEP 5). When the set rotation angle is appropriately set, when the sheet material is moved away from the paper feed roller 32 and stopped (STEP 6), the punch 5 is lowered almost simultaneously and the sheet material is punched (STEP 7). In this way, the cam drive motor 11 is driven before the sheet material stops moving away from the sheet feed roller 32, and the leading end of the punch comes into contact with the sheet material when the sheet material stops. Since the punching is performed, the sheet material stop time can be shortened.
[0034]
After completion of the drilling, the cam shaft 2 continues to rotate and the punch 5 moves upward. When the blade edge moves to the lower surface of the punch guide bracket 7, the punch tip is separated from the sheet material (STEP 8), and the movement of the sheet material becomes free. . The lower surface position is detected by the second encoder 22 and the second photo sensor 26 (STEP 9). In this lower surface position detection, a rotation angle at which the camshaft 2 rotates from the standby position to this position is set in the CPU in advance, and the actual rotation angle is counted by the number of pulses of light that passes through the slit of the second encoder 22. Is done.
[0035]
When the lower surface position at which the punch tip is separated from the sheet material is detected, the CPU 26 drives the arm 34 to swing by a driving means (not shown) to bring the peristaltic roller 33b into contact with the sheet material. Since the driving roller 33a is rotationally driven, the sheet material S is thereby conveyed in the paper discharge direction (STEP 17). When the sheet material S is discharged, the arm 34 moves upward and swings away from the paper surface and the conveyance of the sheet material S is stopped (STEP 18). Thus, the sheet material is discharged and transferred while the punch is still operating earlier than the punch stops at the standby position, so that the sheet material stop time is shortened.
[0036]
On the other hand, even if the cutting edge of the punch 5 passes the lower surface of the punch guide bracket 7, the cam shaft 2 continues to rotate and the punch 5 moves upward toward the standby position. When the punch 5 reaches just before the punch standby position (STEP 10), the second encoder 22 and the second photo sensor 26 detect this pre-standby position (STEP 11), and the CPU 26 turns off the cam drive motor 11 and the cam. The rotation of the shaft 2 is stopped (STEP 12).
[0037]
Since the cam drive motor 11 rotates by inertia even when the power is cut off, the position of the stopped punch 5 deviates from the standby position. The deviation of the rotation angle of the cam shaft is detected by the second encoder 22 and the second photo sensor 26 (STEP 13), the cam drive motor 11 is turned on to drive the cam shaft to rotate (STEP 14), and the punch 5 is set to the standby position. Move.
[0038]
When the second encoder 22 detects the standby position (STEP 15), the cam drive motor 11 is turned off and the camshaft 2 stops (STEP 16). As a result, the punch can be placed at an accurate standby position every time.
[0039]
FIG. 7 is a diagram showing a time difference between the feeding of the sheet material and the driving of the punch. As shown in the figure, since the punch starts to descend earlier than the stop of the introduction and transfer of the sheet material, and the discharge and transfer of the sheet material is performed during the upward movement of the punch, the sheet material stop time T is determined from the punch drive time t. Can also be shortened. Thereby, in the present Example, the stop time of the sheet material could be 0.05 sec or less. Since the feeding speed of the sheet material is usually about 100 mm / sec, the reciprocating punch unit of the present invention enables punching substantially similar to flying punching.
[0040]
As described above, the punching unit for punching a sheet material according to the embodiment of the present invention is a DC motor that drives a cam shaft in a reciprocating type punching unit for punching a sheet material provided with a punch and a die that are driven to reciprocate by a cam. And an encoder for detecting the rotational position of the cam shaft, a sheet conveying means for conveying a sheet material, and a control means for controlling the DC motor and the sheet conveying means by a signal of the encoder,
The sheet position detecting means detects the punching position of the sheet material, the position of the punch is detected by the encoder, the punch operation is started during the introduction of the sheet material, and the sheet material is extracted before the punch stops after punching. Since it starts, even in a reciprocating punch unit, the sheet stop time during punching can be shortened and high-speed punching can be performed.
[0041]
Further, since the punch stop position can be controlled accurately by the encoder by stopping at the standby position, an inexpensive DC motor can be used without using an expensive pulse motor, and the cost can be reduced.
[0042]
Furthermore, the punch unit for punching a sheet material according to the embodiment of the present invention includes a first encoder that detects whether or not the punch is in a standby position, and a second encoder that detects a punch tip position that moves from the rotation angle of the cam shaft. Even when restarting due to a power failure or punch lock, the first encoder detects it and moves the punch to the standby position. In this case, no malfunction occurs.
[0043]
【The invention's effect】
As described above, according to the punching unit for punching a sheet material of the present invention, even a reciprocating punch unit can provide a unit capable of punching at high speed at low cost, so that the apparatus can be downsized and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a flowchart showing the operation of a punch unit for punching a sheet material according to an embodiment of the present invention.
FIG. 2 is a diagram showing an arrangement of an entire configuration of a punch unit for punching sheet material according to an embodiment of the present invention.
FIG. 3 is an exploded perspective view of a unit main body of a punch unit for punching sheet material according to an embodiment of the present invention.
FIG. 4 is a front view showing details of a drive unit and a control unit of a punch unit for punching a sheet material according to an embodiment of the present invention.
FIG. 5 is a side view of FIG. 4;
FIG. 6 is a block diagram showing a configuration of control means of the punching unit for punching sheet material according to the embodiment of the present invention.
FIG. 7 is a diagram illustrating a temporal relationship between punch driving and sheet material feeding in the sheet material punching unit according to the embodiment of the present invention.
[Explanation of symbols]
l Cam shaft assembly, 2 cam shaft, 3 eccentric cam, 4 punch holder, 4a cam follower, 4b long hole, 5 punch, 6 punch guide, 7 punch guide bracket, 7a bearing, 7b bifurcated part, 8 die bracket, 9 rivet, 10 unit body, 11 cam drive motor, 12 pinion, 13a, 13b gear, 14 gear, 15 punch control unit, 16 transport control unit, 20 control means, 21 first encoder, 21a notch, 22 second encoder, 22a slit , 23 paper feed roller encoder (paper feed roller rotation control means), 24 first photo sensor, 25 second photo sensor, 26 CPU, 31 paper edge detection means, 32 paper feed roller, 33 paper discharge roller, 33a drive roller, 33b Peristaltic roller, 34 arm, 35 Paper feed roller rotation detection means

Claims (4)

In a reciprocating sheet material punching punch unit comprising a punch reciprocally driven by a rotating cam and a die for punching a sheet material in cooperation with the punch, the cam shaft provided with the cam, and the cam shaft a DC motor for driving the an encoder for detecting the rotational position of the cam shaft, a sheet conveying means for conveying the sheet material, and control means for controlling said sheet transport means and said DC motor by a signal of the encoder The encoder includes a first disc in which a range of an angle corresponding to a standby position of a punch mounted on the camshaft is cut out, and a first photosensor corresponding to the first disc, and the tip position of the punch From the rotation angle of the camshaft having a first encoder for detecting whether the camera is at the standby position, a second disk having a plurality of transmission windows slit therein, and a second photosensor corresponding to the second disk. Move Sheet perforating punch unit, characterized in that composed of the second encoder for detecting the punch tip position that. The control means detects the punch tip position based on the rotation angle of the cam shaft detected by the second encoder, starts the punch operation before the conveyed sheet material stops, and before the punch stops after punching. in to start the sheet material conveying, sheet perforating punch unit according to claim 1, characterized in that to control said sheet transport means and said DC motor. 3. The sheet material punching according to claim 1, wherein the control unit controls the punch to always be in a standby position when the unit is started by detecting the punch tip position with the first encoder. 4. Punch unit. The sheet conveying means comprising a supply roller for supplying the sheet material to the punch and a discharge roller for discharging from the punch, a paper edge detecting means for detecting the paper edge of the supplied sheet material, and a rotation angle of the supply roller are detected. sheet perforating punch unit according to any of claims 1 to 3, characterized in that Ru and a seat position detecting means and a rotation detecting means.

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