Control device for plate material feeder

Abstract

To provide a control device for a plate material feeder, that highly accurately measures an amount of conveyance of a plate material to a processing device by a plate material feeder.SOLUTION: A control device 101 for a plate material feeder 201 includes: a control part 102 for controlling rotation of a first roll 202 and a second roll 203 of a plate material feeder 201; a transmission part 103 for transmitting an electromagnetic wave 105 toward a plate material 100; and a reception part 104 for receiving an electromagnetic wave 106 reflected by the plate material 100. The control part 102 measures a conveyance speed of the plate material 100 during a prescribed period, on the basis of a frequency of the electromagnetic wave 106 received by the reception part 104, and measures a conveyance amount of the plate material 100 on the basis of the conveyance speed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a control device for a workpiece feeding device, which is capable of measuring with high precision the amount of workpiece transported by the workpiece feeding device to a processing device. [Background technology]

[0002] Patent Document 1 discloses a stamping system including a press mechanism, a material feed mechanism, and a material dispenser. In this stamping system, the material feed mechanism feeds material from the material dispenser through the material feed mechanism to the press mechanism, and measures the movement of the material in the material dispenser and uses the measured movement to determine the desired timing of a material release mechanism including a material gripping mechanism that grips the material in cooperation with a feed drive roll. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2004-520934 Summary of the Invention [Problem to be solved by the invention]

[0004] In the stamping system of Patent Document 1, the material transported from the material dispenser through the material feed mechanism to the press mechanism moves due to vibrations during press processing by the press mechanism. Therefore, the amount of material actually transported to the press mechanism differs from the amount of material transported from the material dispenser, and there is a problem that the amount of material transported in the press mechanism cannot be measured. In addition, since the material generally does not have a mark such as a scale for measuring the amount of material transported, there is a problem that the amount of material transported in the press mechanism cannot be measured.

[0005] Therefore, an object of the present invention is to solve the above problems and provide a control device for a plate material feeding device that can measure with high precision the transport amount of plate material transported in a processing device such as a press device. [Means for solving the problem]

[0006] According to one aspect of the present invention, a control device for a workpiece feeding device having a first roll and a second roll, which clamps a workpiece by the first roll and the second roll and transports the workpiece in accordance with the rotation of the first roll and the second roll, comprises a control unit that controls the rotation of the first roll and the second roll, a transmitting unit that transmits electromagnetic waves toward the workpiece, and a receiving unit that receives the electromagnetic waves reflected by the workpiece, and the control unit measures the transport speed of the workpiece over a predetermined period of time based on the frequency of the electromagnetic waves received by the receiving unit, and measures the transport amount of the workpiece based on the transport speed.

[0007] According to one embodiment of the present invention, in a control device for a workpiece feeding device, a control unit measures the conveying speed of the workpiece based on the difference between the frequency of the electromagnetic waves transmitted by the transmitting unit and the frequency of the electromagnetic waves received by the receiving unit.

[0008] According to one embodiment of the present invention, in a control device for a plate material feeding device, a transmitter transmits electromagnetic waves from two directions toward the plate material, a receiver receives the electromagnetic waves from the two directions reflected by the plate material, and a control unit measures the conveying speed of the plate material based on the difference in frequency of the reflected electromagnetic waves from the two directions.

[0009] According to one embodiment of the present invention, in a control device for a workpiece feeding device, a receiving unit transmits a conveying speed related signal based on the frequency of the received electromagnetic wave to a control unit.

[0010] According to one embodiment of the present invention, in a control device for a workpiece feeding device, a conveying speed related signal has a period based on the conveying speed of the workpiece.

[0011] According to one embodiment of the present invention, in a control device for a workpiece feeding device, when the workpiece feeding device is transporting a workpiece, a control unit controls a receiving unit to transmit a transport speed related signal to the control unit.

[0012] According to one embodiment of the present invention, in a control device for a workpiece feeding device, when the workpiece feeding device is transporting a workpiece, a control unit controls a transmitting unit to transmit an electromagnetic wave toward the workpiece.

[0013] According to one embodiment of the present invention, in a control device for a plate material feeding device, a control unit controls the transportation of the plate material by rotation of a first roll and a second roll, and the specified period is a period during which the plate material is transported by rotation of the first roll and the second roll.

[0014] According to one embodiment of the present invention, the plate material feeding device further includes a release device for releasing the plate material clamped by the first roll and the second roll, and in a control device for the plate material feeding device, a control unit controls the transportation of the plate material by the release device, and the specified period is the period during which the plate material is clamped by the first roll and the second roll.

[0015] According to one embodiment of the present invention, in a control device for a workpiece feeding device, a control unit determines a predetermined period based on a status signal from a processing device that processes the workpiece transported from the workpiece feeding device. Effect of the Invention

[0016] According to the present invention, the transport amount of a plate material transported in a processing device can be measured with high accuracy without using a mark for measurement.

[0017] Other objects, features and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments of the present invention taken in conjunction with the accompanying drawings. [Brief description of the drawings]

[0018] [Figure 1]1 is a schematic diagram of a control device for a workpiece feeding device according to an embodiment of the present invention; [Figure 2A] 1 is a schematic diagram illustrating reflection of electromagnetic waves from a plate according to one embodiment; [Figure 2B] FIG. 11 is a schematic diagram showing reflection of electromagnetic waves from a plate according to another embodiment. [Diagram 3] FIG. 4 is a timing diagram of a conveying speed related signal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to these embodiments.

[0020] 1 to 3, a control device 101 for a plate material feeding device 201 according to an embodiment of the present invention will be described. The plate material feeding device 201 includes a first roll 202 and a second roll 203, and clamps a plate material 100 with the first roll 202 and the second roll 203. As shown in FIG. 1, the plate material feeding device 201 rotates the first roll 202 and the second roll 203 in the direction of the arrow, and the plate material 100 can be transported as shown by the arrow in accordance with the rotation of the first roll 202 and the second roll 203. The plate material 100 is transported by the plate material feeding device 201 to a processing device 301 such as a press device, and processed by the processing device 301. The control device 101 includes a control unit 102 that controls the rotation of the first roll 202 and the second roll 203 of the plate material feeding device 201, a transmitting unit 103 that transmits an electromagnetic wave 105 toward the plate material 100, and a receiving unit 104 that receives the electromagnetic wave 106 reflected by the plate material 100. The control unit 102 is connected to the plate material feeding device 201 via a plate material feeding control signal line 107 and controls the rotation of the first roll 202 and the second roll 203. The control unit 102 measures the conveying speed v of the plate material 100 during a predetermined period determined by the control unit 102 based on the frequency of the electromagnetic wave 106 received by the receiving unit 104. Next, based on the measured conveying speed v of the plate material 100, the control unit 102 measures the conveying amount of the plate material 100 conveyed to the processing device 301 during a predetermined period. In FIG. 1, the control unit 102 is provided separately from the plate material feeding device 201 and the processing device 301, but may be built in the plate material feeding device 201 or the processing device 301. In FIG. 1, the transmission unit 103 and the reception unit 104 are built in the processing device 301, but may be built in the plate material feeding device 201 so as to measure the conveyance amount of the plate material 100 before or after the plate material 100 passes through the first roll 202 and the second roll 203, and may be provided at a location as required. Furthermore, the entire control device 101 may be built in the plate material feeding device 201 that conveys the plate material 100, or may be built in the processing device 301 such as a press device that processes the plate material 100 conveyed from the plate material feeding device 201.

[0021] The control unit 102 may measure the conveying speed v of the plate material 100 based on the difference between the frequency of the electromagnetic wave 105 transmitted by the transmission unit 103 and the frequency of the electromagnetic wave 106 received by the reception unit 104. In FIG. 2A, the transmission unit 103 transmits the electromagnetic wave 105 with an incident angle of θ to the plate material 100, and the reception unit 104 receives the electromagnetic wave 106 reflected from the plate material 100 with a reflection angle of θ. The frequency of the electromagnetic wave 105 transmitted by the transmission unit 103 is defined as f T If the speed of the electromagnetic waves 105 and 106 is c, the frequency f of the electromagnetic wave 106 received by the receiver 104 is R is expressed by equation (1) due to the Doppler effect.

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[0022] In FIG. 2B, the transmitting unit 103 transmits electromagnetic waves 105 from two directions toward the plate material 100. In this case, the transmitting unit 103 has an electromagnetic wave source, a beam splitter, and a mirror. The electromagnetic wave generated from the electromagnetic wave source of the transmitting unit 103 is split into two by the beam splitter, and one electromagnetic wave 105 is transmitted directly to the plate material 100 at an incident angle of θ, while the other electromagnetic wave 105 is reflected by the mirror and transmitted to the plate material 100 at an incident angle of θ opposite to that of the one electromagnetic wave 105. The frequency of the electromagnetic wave 105 transmitted by the transmitting unit 103 is denoted as f T If the speed of the electromagnetic waves 105 and 106 is c, the frequency of the electromagnetic wave 106 when the electromagnetic wave 105 is reflected by the plate material 100 is f R1 is expressed by equation (3) due to the Doppler effect.

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[0023] The transmitting unit 103 is connected to the control unit 102 via an electromagnetic wave control signal line 108, and the receiving unit 104 is connected to the control unit 102 via a conveying speed-related signal line 109. The receiving unit 104 receives an electromagnetic wave 106 having a frequency as shown in formulas (1), (3), and (4) which is different from the frequency of the electromagnetic wave 105 transmitted by the transmitting unit 103 as described above, and transmits a conveying speed-related signal based on the frequency of the received electromagnetic wave 106 via the conveying speed-related signal line 109 to the control unit 102. For example, the receiving unit 104 may transmit a signal related to the frequency of the received electromagnetic wave 106 as shown in formulas (1), (3), and (4) via the conveying speed-related signal line 109 to the control unit 102, or may transmit a signal related to the mixing process as shown in formula (2) and the heterodyne process as shown in formula (5) via the conveying speed-related signal line 109 to the control unit 102. As expressed by equations (1) to (5), these signals have a frequency, i.e., a period, based on the conveying speed v of the plate material 100. Note that it is sufficient that these signals contain information related to the conveying speed v of the plate material 100.

[0024] The control unit 102 may control the receiving unit 104 to transmit a conveying speed related signal to the control unit 102 when the workpiece feeder 201 is conveying the workpiece 100. The control unit 102 may also control the transmitting unit 103 to transmit an electromagnetic wave 105 toward the workpiece 100 when the workpiece feeder 201 is conveying the workpiece 100. When the workpiece feeder 201 starts conveying the workpiece 100, as shown in FIG. 3, the control unit 102 sets the conveying timing to H level via the electromagnetic wave control signal line 108, and controls the transmitting unit 103 to transmit the electromagnetic wave 105 toward the workpiece 100. The receiving unit 104 receives the electromagnetic wave 106 reflected by the workpiece 100, and transmits a measurement result pulse, which is a conveying speed related signal, to the control unit 102 via the conveying speed related signal line 109. The measurement result pulse may be an AB phase output in which the phases are shifted by 90° from each other as shown in FIG. 3. The measurement result pulse has a frequency based on the conveying speed v of the plate material 100, and the frequency increases as the conveying speed v of the plate material 100 increases, and decreases as the conveying speed v of the plate material 100 decreases. Based on the measurement result pulse, the conveying amount of the plate material 100 to the processing device 301 is measured. When the plate material feed device 201 finishes conveying the plate material 100, as shown in FIG. 3, the control unit 102 sets the conveying timing to the L level via the electromagnetic wave control signal line 108, and controls the transmitting unit 103 to stop transmitting the electromagnetic wave 105 to the plate material 100. In this way, the conveying speed v of the plate material 100 during the period when the conveying timing is at the H level can be measured, and the conveying amount of the plate material 100 to the processing device 301 can be measured.

[0025] The control unit 102 may directly transmit the transport timing to the receiving unit 104. In this case, when the control unit 102 sets the transport timing to H level, the receiving unit 104 transmits a transport speed related signal to the control unit 102 via the transport speed related signal line 109, and when the control unit 102 sets the transport timing to L level, the receiving unit 104 stops transmitting the transport speed related signal to the control unit 102. Furthermore, the control unit 102 does not need to transmit the transport timing to the transmitting unit 103 and the receiving unit 104. In this case, the receiving unit 104 constantly transmits a conveying speed-related signal to the control unit 102 via the conveying speed-related signal line 109. The control unit 102 extracts a period during which the conveying timing is at H level from the conveying speed-related signals for all periods transmitted from the receiving unit 104, measures the conveying speed v of the plate material 100 based on the conveying speed-related signals for that extracted period, and then measures the conveying amount of the plate material 100 conveyed to the processing device 301 during that extracted period based on the measured conveying speed v of the plate material 100.

[0026] The control unit 102 controls the rotation of the first roll 202 and the second roll 203 of the workpiece feeding device 201 via the workpiece feeding control signal line 107, thereby controlling the transportation of the workpiece 100 by the rotation of the first roll 202 and the second roll 203. The predetermined period during which the transport amount of the workpiece 100 to the processing device 301 is measured may be a period during which the workpiece 100 is transported by the rotation of the first roll 202 and the second roll 203.

[0027] The workpiece feeding device 201 may further include a release device 204 for releasing the workpiece 100 clamped by the first roll 202 and the second roll 203. The release device 204 may be connected to either the first roll 202 or the second roll 203, and the workpiece 100 is clamped or released by the release device 204 raising or lowering the first roll 202 and / or the second roll 203. The control unit 102 controls the conveyance of the workpiece 100 by controlling the release device 204 via the workpiece feed control signal line 107. The predetermined period during which the conveyance amount of the workpiece 100 to the processing device 301 is measured may be a period during which the workpiece 100 is clamped by the first roll 202 and the second roll 203.

[0028] The processing device 301 processes the plate material 100 transported from the plate material feed device 201. When the processing device 301 is a press device, the processing device 301 includes an upper die 302 and a lower die 303, and the plate material 100 is punched by the cooperation of the upper die 302 and the lower die 303. When a processing process such as punching is being performed by the processing device 301, it is necessary to stop the transportation of the plate material 100. To this end, the processing device 301 transmits a status signal relating to the status of the processing device 301, i.e., a signal indicating whether the plate material 100 should be transported or the transportation of the plate material 100 should be stopped, to the control unit 102 via a status signal line 111. Based on the signal from the processing device 301, the control unit 102 determines the period during which the first roll 202 and the second roll 203 are rotated, the period during which the first roll 202 and the second roll 203 clamp the plate material 100, and the like, and further determines a predetermined period during which the transport amount of the plate material 100 to the processing device 301 is measured, as described above. The transport amount of the plate material 100 measured by the control unit 102 may be transmitted to the processing device 301 via a transport amount signal line 110, and may also be displayed on a display device such as a display.

[0029] The plate material feeding device 201 intermittently feeds the plate material 100 at a constant amount to the processing device 301, and the control device 101 of the present invention can measure with high precision the amount of plate material 100 fed by the plate material feeding device 201 to the processing device 301. The measured amount of plate material 100 fed can be used to adjust the feeding speed of the plate material 100 to the processing device 301, the amount of plate material 100 fed to the processing device 301, the stopping position of the plate material 100 in the processing device 301, and the like.

[0030] Although the above description has been given with respect to a particular embodiment, it will be apparent to those skilled in the art that the present invention is not limited thereto, and that various changes and modifications can be made within the principles of the present invention and the scope of the appended claims. [Explanation of symbols]

[0031] 100 Board material 101 Control device 102 Control section 103 Transmitter 104 Receiving unit 105 Transmitted Electromagnetic Waves 106 Reflected Electromagnetic Waves 107 Plate feed control signal line 108 Electromagnetic Wave Control Signal Line 109 Conveyor speed related signal line 110 Carrying amount signal line 111 Status signal line 201 Plate material feeding device 202 First Roll 203 Second Roll 204 Release device 301 Processing equipment 302 Upper mold 303 Lower mold

Claims

1. A control device for a workpiece feeding device including a first roll and a second roll, the control device being configured to clamp a workpiece by the first roll and the second roll, and to intermittently transport the workpiece to a processing device that processes the workpiece in accordance with rotation of the first roll and the second roll, the control device includes a control unit that controls rotation of the first roll and the second roll, a transmitting unit that transmits an electromagnetic wave toward the plate material, and a receiving unit that receives the electromagnetic wave reflected by the plate material, The transmitting unit and the receiving unit are disposed within the processing device, the transmitting unit transmits the electromagnetic wave toward one region of the plate material after the plate material has passed through the plate material feed device and before the plate material is processed by the processing device, and the receiving unit receives the electromagnetic wave reflected by the one region of the plate material, The control unit measures a conveying speed of the plate material to be processed by the processing device during a predetermined period in which the plate material is clamped by the first roll and the second roll based on a difference between the frequency of the electromagnetic waves transmitted by the transmitting unit toward the one area and the frequency of the electromagnetic waves received by the receiving unit from the one area, and measures the conveying amount of the plate material during the predetermined period based on the conveying speed.

2. A control device for a workpiece feeding device including a first roll and a second roll, the control device being configured to clamp a workpiece by the first roll and the second roll, and to intermittently transport the workpiece to a processing device that processes the workpiece in accordance with rotation of the first roll and the second roll, the control device includes a control unit that controls rotation of the first roll and the second roll, a transmitting unit that transmits an electromagnetic wave toward the plate material, and a receiving unit that receives the electromagnetic wave reflected by the plate material, The transmitting unit and the receiving unit are disposed within the processing device, the transmitting unit transmits the electromagnetic wave toward one region of the plate material after the plate material has passed through the plate material feed device and before the plate material is processed by the processing device, and the receiving unit receives the electromagnetic wave reflected by the one region of the plate material, A control device, wherein the transmitting unit transmits electromagnetic waves from two directions toward the one area of ​​the plate material, the receiving unit receives the electromagnetic waves from the two directions reflected by the one area of ​​the plate material, and the control unit measures a conveying speed of the plate material to be processed by the processing device during a predetermined period during which the plate material is clamped by the first roll and the second roll based on a difference in frequency of the reflected electromagnetic waves from the two directions, and measures the conveying amount of the plate material during the predetermined period based on the conveying speed.

3. The control device according to claim 1 , wherein the receiving unit transmits to the control unit a signal related to a conveying speed that is based on a frequency of the received electromagnetic wave.

4. The control device according to claim 3 , wherein the conveying speed related signal has a period based on the conveying speed of the plate material.

5. The control device according to claim 3 or 4, wherein, when the workpiece feeding device is transporting the workpiece, the control unit controls the receiving unit to transmit the transport speed related signal to the control unit.

6. The control device according to any one of claims 3 to 5, wherein when the workpiece feeding device is transporting the workpiece, the control unit controls the transmitting unit to transmit the electromagnetic wave toward the workpiece.

7. A control device as described in any one of claims 1 to 6, wherein the control unit controls the transportation of the plate material by rotation of the first roll and the second roll, and during the specified period, the plate material is transported by rotation of the first roll and the second roll.

8. The control device according to any one of claims 1 to 6, wherein the plate material feeding device further comprises a release device for releasing the plate material clamped by the first roll and the second roll, and the control unit controls the transportation of the plate material by the release device.

9. The control device according to any one of claims 1 to 8, wherein the control unit determines the predetermined period based on a status signal from the processing device that processes the plate material transported from the plate material feed device.

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