JP7682913B2 - Processing Line System - Google Patents

Description

The present invention relates to a processing line system equipped with a plate material supplying device that can supply plate materials to a plate material feeding device that intermittently transports plate materials to a processing device in a manner that improves production efficiency.

When a plate material feeder conveys plate material such as coil material to a processing device such as a press, the conveying operation by the plate material feeder is performed intermittently so that the plate material advances and stops repeatedly in accordance with the processing in the processing device. The inertial force generated by the advancement and stopping of the plate material acts on the plate material, causing the plate material to vibrate or to cause a wavy phenomenon called fluttering. When such fluttering occurs, not only does it place an excessive burden on the plate material feeder, but it also causes the plate material to bend or get scratched, so it is necessary to provide a buffer section called a looper. As a method for mitigating the fluttering of plate material, there is a plate material supply device in which a U-shaped, S-shaped, or other looper is provided as a buffer section. Although there is less fluttering compared to when a U-shaped, S-shaped, or other looper is not provided, fluttering occurs when the plate material is transported at high speed, and the plate material cannot be transported at a higher speed than that, and there is a problem that the processing capacity cannot be fully demonstrated while high speed processing is required.

Patent Document 1 discloses a coil material supplying device that includes a pair of feed rolls that are arranged near a sheet material supplying device of a press machine and have a servo motor for feeding the coil material while creating a loop, a position sensor for detecting the amount of loop in the coil material, and a control device that controls the servo motor based on a signal from the position sensor to control the amount of coil material fed by the feed roll. Patent Document 2 discloses a coil material supplying device for supplying coil material to a sheet material feeding device of a press machine, the coil material supplying device including a coil material supplying section, a position sensor that detects the amount of loop in the coil material provided downstream of the coil material supplying section, a control device that controls the servo motor based on a signal from the position sensor to control the amount of coil material fed by the feed roll, and a stand that holds the coil material supplying section in a state where its mounting angle can be adjusted so that the material feed angle can be changed according to conditions. Patent Document 3 discloses a coil material supplying device which has a leveller section which straightens and sends out the coil material, an outlet guide section which is provided in a section where a loop of the coil material is formed at the outlet of the leveller section, and an upper guide section which is provided in the section where a loop of the coil material is formed, one at the outlet of the leveller section and the other at the horizontal transition section of the loop, and which has a sensor provided in the section where the loop is formed to optimally control the bulge of the loop.

Japanese Utility Model Application Publication No. 6-5716 JP 2004-142876 A JP 2011-104650 A

In a processing line system equipped with processing equipment such as a press machine, even if the coil material supplying device according to Patent Documents 1 to 3 is used as a sheet material supplying device that supplies sheet material to a sheet material feeding device, when the sheet material feeding device intermittently transports sheet material to the processing equipment at high speed, the inertial force generated by the advancement and stopping of the sheet material causes the sheet material to vibrate and even to easily cause fluttering, which is a problem in that the production efficiency of the processing line system cannot be improved.

Therefore, the object of the present invention is to provide a processing line system equipped with a plate material supplying device that can supply plate materials to the plate material supplying device so as to alleviate the effects of inertial forces caused by the advancement and stopping of plate materials by the plate material supplying device, and further suppress the occurrence of fluttering, thereby improving production efficiency, in order to solve the above-mentioned problems.

According to one aspect of the present invention, a processing line system includes a processing device that processes plate materials, a plate material feeding device that intermittently transports the plate materials to the processing device, and a plate material supplying device that supplies plate materials from an uncoiler to the plate material feeding device, and the plate material supplying device is capable of changing the speed at which the plate material is supplied to the plate material feeding device depending on the process for the plate material in the processing device.

According to one embodiment of the present invention, in a processing line system, the process of the processing device includes a process of moving the plate material and a process of processing the plate material, and the speed at which the plate material is supplied by the plate material supplying device in the moving process is faster than the speed at which the plate material is supplied by the plate material supplying device in the processing process.

According to one embodiment of the present invention, in a processing line system, a workpiece supplying device is capable of changing the speed at which the workpiece is supplied to the workpiece feeding device depending on the speed at which the workpiece feeding device transports the workpiece to the processing device.

According to one specific example of the present invention, in a processing line system, a workpiece supplying device is capable of increasing the speed at which the workpiece is supplied to the workpiece feeding device when the workpiece feeding device starts to transport the workpiece, and of decreasing the speed at which the workpiece is supplied to the workpiece feeding device when the workpiece feeding device stops to transport the workpiece.

According to one embodiment of the present invention, in a processing line system, a plate material supplying device is capable of changing the speed at which the plate material is supplied to the plate material feeding device so that the amount of plate material supplied from the plate material supplying device to the plate material feeding device during one process cycle of the processing device is substantially the same as the amount of plate material transported from the plate material feeding device to the processing device.

According to one embodiment of the present invention, in a processing line system, a workpiece supply device constantly supplies workpieces to a workpiece feeding device.

According to one embodiment of the present invention, in a processing line system, when the workpiece feeding device is not transporting workpieces to the processing device, the workpiece supply device supplies workpieces to the workpiece feeding device.

According to one embodiment of the present invention, in a processing line system, the speed at which a workpiece supply device supplies workpieces to a workpiece feeding device is different from the speed at which the workpiece feeding device transports the workpieces to the processing device.

According to one embodiment of the present invention, in a processing line system, a processing device is provided with a sensor for detecting the process of the processing device, and a plate material feeding device is capable of intermittently transporting plate material to the processing device in response to an output signal from the sensor.

According to one embodiment of the present invention, in a processing line system, a workpiece supply device is capable of changing the speed at which the workpiece is supplied to a workpiece delivery device in response to an output signal from a sensor.

According to the present invention, the processing line system is capable of processing plate materials at high speed, thereby improving production efficiency.

Other objects, features and advantages of the present invention will become apparent from the following description of an embodiment of the present invention taken in conjunction with the accompanying drawings.

1 is a schematic diagram of a processing line system according to an embodiment of the present invention; 2 is a diagram showing an example of an operational relationship between a processing device, a workpiece feeding device, and a workpiece supplying device in the processing line system of FIG. 1 . FIG. 1. FIG. 4 is a diagram showing another example of the operational relationship between the processing device, the workpiece feeding device, and the workpiece supplying device in the processing line system of FIG.

Below, examples of the present invention are described with reference to the drawings, but the present invention is not limited to these examples.

With reference to Figure 1, a processing line system 101 as one embodiment of the present invention will be described. As shown in Figure 1, the processing line system 101 includes a processing device 102 such as a press device that processes plate material 106 such as coil material by press processing, a plate material feeder (feeder) 103 that intermittently transports the plate material 106 to the processing device 102, and a plate material supply device (stock controller) 104 that supplies the plate material 106 from an uncoiler 105 to the plate material feeder 103. The processing line system 101 also includes a control device 107 for controlling the processing device 102, the plate material feeder 103, and the plate material supply device 104. The plate material feed device 103 may include a pair of rolls, a motor that rotates and drives at least one of the pair of rolls, and a control device that controls the motor, and the control device of the plate material feed device 103 may control the intermittent transport of the plate material 106 to the processing device 102 by having the pair of rolls grip the plate material 106 or by separating the pair of rolls to release the plate material 106. However, the plate material feed device 103 is not limited to this. The plate material supply device 104 straightens and flattens the plate material 106 taken out from the uncoiler 105, and may include two or more rolls for gripping and transporting the plate material 106, a motor that rotates and drives at least one of the two or more rolls, and a control device that controls the motor to control the amount of the plate material 106 supplied to the plate material feed device 103 by the two or more rolls, and the two or more rolls may be connected by a connection device such as a timing belt or a gear. However, the plate material supply device 104 is not limited to this. The control device for the workpiece feeding device 103 and the control device for the workpiece supplying device 104 may be built into the control device 107 .

Between the plate material supply device 104 and the plate material feed device 103, a space 108 is provided in which the plate material 106 can be retained in response to the intermittent transport of the plate material feed device 103 to the processing device 102. The space 108 provides a space for the plate material 106 to slack. When the plate material supply device 104 supplies the plate material 106 to the plate material feed device 103, the plate material 106 is transported in the space 108 to form a loop as shown in FIG. 1. The transport operation of the plate material 106 by the plate material feed device 103 is performed intermittently so that the plate material 106 repeatedly advances and stops in accordance with the processing in the processing device 102. When the plate material feeder 103 stops conveying the plate material 106 to the processing device 102, while the plate material supplying device 104 continues to supply the plate material 106 to the plate material feeder 103, the plate material 106 remains in the space 108, and the loop formed by the plate material 106 gradually moves to the left in the space 108 shown in Fig. 1 according to the stop time of the plate material conveyance by the plate material feeder 103. When the plate material feeder 103 starts conveying the plate material 106 to the processing device 102 again, the loop formed by the plate material 106 gradually moves to the right in the space 108 shown in Fig. 1. By providing the space 108 in this way, the amount of plate material conveyed to the processing device 102 by the plate material feeder 103 can be adjusted, but in a loop without a guide for guiding the plate material 106, the inertial force generated due to the advancement and stop of the plate material 106 by the plate material feeder 103 causes the plate material 106 to vibrate and is prone to fluttering.

The plate material supplying device 104 can change the speed at which the plate material 106 is supplied to the plate material feeding device 103 depending on the process for the plate material 106 of the processing device 102. The process of the processing device 102 includes a process of moving the plate material 106 according to the desired length by the plate material feeding device 103 and a process of processing the moved plate material 106. The plate material supplying device 104 can change the speed at which the plate material 106 is supplied to the plate material feeding device 103 when switching from the process of moving the plate material 106 to the process of processing the plate material 106, and when switching from the process of processing the plate material 106 to the process of moving the plate material 106. For example, when the processing device 102 is a press device, the press device may include a crankshaft 109, an upper die 111, a lower die 112, a motor that rotates and drives the crankshaft 109, and a control device that controls the motor. After the step of moving the plate material 106, the control device of the press device may control the motor to rotate and drive the crankshaft 109 provided with an eccentric cam or the like in the step of pressing the plate material 106, thereby moving the upper die 111 engaged with the eccentric cam or the like vertically upward and downward, and press the moved plate material 106 by cooperation between the upper die 111 and the lower die 112. Then, after the step of pressing the plate material 106, the plate material 106 may be moved again by the plate material feed device 103 according to the desired length. However, the processing device 102 is not limited to this. The control device of the processing device 102 may be built into the control device 107. The control device of the plate material supplying device 104 changes the rotational speed of the motor output shaft when switching from the process of moving the plate material 106 to the process of pressing the plate material 106, and when switching from the process of pressing the plate material 106 to the process of moving the plate material 106, and in conjunction with the change in the rotational speed of the motor output shaft, changes the rotational speed of two or more rolls that grip the plate material 106, thereby changing the speed at which the plate material 106 is supplied to the plate material feeding device 103.

The plate material supplying device 104 can supply the plate material 106 to the plate material feeding device 103 at a speed faster than the speed at which the plate material 106 is supplied to the plate material feeding device 103 in the process of moving the plate material 106. FIG. 2A shows an example of the operational relationship between the processing device 102, the plate material feeding device 103, and the plate material supplying device 104 in one cycle of the process of the processing device 102. In particular, when the processing device 102 is a press device, an example of the operational relationship when the die A is used as an example of the upper die 111 and the lower die 112 is shown. The angle (°) shown in FIG. 2A represents the rotation angle of the crankshaft 109, and the time when the crankshaft 109 rotates from 270° through 0° to 90° represents the process of moving the plate material 106 according to the desired length by the plate material feeding device 103. When the crankshaft 109 rotates from 90° through 180° to 270°, it represents a state in which the conveyance of the plate material 106 to the processing device 102 by the plate material feeder 103 is stopped, and when the crankshaft 109 rotates around 180°, it represents a process of processing the moved plate material 106. When the crankshaft 109 rotates from 270° through 0° to 90°, that is, in the case of the process of moving the plate material 106 by the plate material feeder 103, the plate material feeder 104 supplies the plate material 106 to the plate material feeder 103 at a constant first speed. When the crankshaft 109 rotates from 90° through 180° to 270°, that is, in the case of the process of processing the plate material 106, the plate material feeder 104 supplies the plate material 106 to the plate material feeder 103 at a constant second speed. The first speed corresponds to the speed at which the workpiece 106 is moved by the workpiece feeder 103, and is therefore set to be faster than the second speed.

2B shows another example of the operational relationship between the processing device 102, the workpiece feed device 103, and the workpiece supply device 104 in one cycle of the process of the processing device 102. In particular, when the processing device 102 is a press device, another example of the operational relationship is shown when die B is used as another example of the upper die 111 and the lower die 112, which are different from die A. The angle (°) shown in FIG. 2B represents the rotation angle of the crankshaft 109, and when the crankshaft 109 rotates from 240° through 0° to 120°, it represents the process of moving the workpiece 106 by the workpiece feed device 103 according to the desired length. The time when the crankshaft 109 rotates from 120° through 180° to 240° represents a state in which the conveyance of the plate material 106 to the processing device 102 by the plate material feeder 103 is stopped, and the time when the crankshaft 109 rotates around 180° represents a process of processing the plate material 106 that has been moved. Comparing Fig. 2A and Fig. 2B, the rotation angle of the crankshaft 109 during the process of moving the plate material 106 by the plate material feeder 103 is 180° in Fig. 2A, while it is 240° in Fig. 2B. If the conveyance amount of the plate material 106 of the plate material feeder 103 per unit time is the same, the plate material feeder 103 can convey a larger amount of the plate material 106 in Fig. 2B compared to Fig. 2A. Furthermore, if the rotation angle of the crankshaft 109 during the process of moving the plate material 106 by the plate material feeding device 103 is set to 120°, the plate material feeding device 103 can transport a smaller amount of plate material 106 compared to Fig. 2A. In this way, the amount of plate material 106 transported by the plate material feeding device 103 to the processing device 102 can be adjusted according to the rotation angle of the crankshaft 109 so as to match the mold used in the press device.

The crankshaft 109 may be rotated quickly or slowly depending on the rotation angle. For example, in FIG. 2A, when the crankshaft 109 rotates from 270° through 0° to 90°, the crankshaft 109 may be rotated quickly to shorten the time to transport the plate material 106 to the processing device 102, and the amount of plate material 106 transported to the processing device 102 may be reduced. Also, when the crankshaft 109 rotates from 270° through 0° to 90°, the crankshaft 109 may be rotated slowly to lengthen the time to transport the plate material 106 to the processing device 102, and the amount of plate material 106 transported to the processing device 102 may be increased.

The plate material supplying device 104 can change the speed at which the plate material 106 is supplied to the plate material feeding device 103 depending on the speed at which the plate material feeding device 103 conveys the plate material 106 to the processing device 102. The conveying operation of the plate material 106 by the plate material feeding device 103 is performed intermittently so that the plate material 106 is repeatedly advanced and stopped in accordance with the processing in the processing device 102. Therefore, when the plate material feeding device 103 stops conveying the plate material 106 to the processing device 102, if the plate material supplying device 104 continues to supply the plate material at the same speed as when the plate material feeding device 103 conveys the plate material 106 to the processing device 102, the inertial force generated by the advancement and stoppage of the plate material 106 by the plate material feeding device 103 may cause fluttering. Therefore, the plate material supplying device 104 may change the speed at which the plate material 106 is supplied to the plate material feeding device 103 so as to be synchronized with the speed at which the plate material feeding device 103 conveys the plate material 106 to the processing device 102. As shown in Figs. 2A and 2B, when the plate material feeding device 103 stops conveying the plate material 106 to the processing device 102, the plate material supplying device 104 may slow down the speed at which the plate material supplying device 104 supplies the plate material 106 to the plate material feeding device 103, and may reduce the amount of the plate material 106 supplied to the plate material feeding device 103, compared to when the plate material feeding device 103 conveys the plate material 106 to the processing device 102. This adjusts the amount of plate material 106 remaining in the space 108, thereby suppressing the occurrence of fluttering.

2A and 2B, the plate material supplying device 104 may change the speed to slow down the speed at which the plate material 106 is supplied to the plate material feeding device 103 when the plate material feeding device 103 stops conveying the plate material 106 to the processing device 102. The plate material supplying device 104 may change the speed to speed up the speed at which the plate material 106 is supplied to the plate material feeding device 103 when the plate material feeding device 103 starts conveying the plate material 106 to the processing device 102 again. The plate material supplying device 104 may also change the speed at which the plate material 106 is supplied to the plate material feeding device 103 so that the amount of the plate material 106 supplied from the plate material supplying device 104 to the plate material feeding device 103 during one cycle of the process of the processing device 102 is substantially the same as the amount of the plate material 106 conveyed from the plate material feeding device 103 to the processing device 102. This makes it possible to adjust the amount of plate material 106 remaining in space 108 and further suppress the occurrence of fluttering.

The plate material supplying device 104 can supply the plate material 106 to the plate material feeding device 103 at any speed, but if the plate material supplying device 104 is operated to supply the plate material 106 to the plate material feeding device 103 intermittently in the same manner as the plate material feeding device 103, fluttering may occur between the plate material supplying device 104 and the uncoiler 105. In order to suppress the occurrence of this fluttering, the plate material supplying device 104 may constantly supply the plate material 106 to the plate material feeding device 103, or may supply the plate material 106 to the plate material feeding device 103 even when the plate material feeding device 103 is not transporting the plate material 106 to the processing device 102.

2A and 2B, the speed at which the plate material supplying device 104 supplies the plate material 106 to the plate material feeding device 103 does not have to be the same as the speed at which the plate material feeding device 103 transports the plate material 106 to the processing device 102, and may be different regardless of the process of the processing device 102. Depending on conditions such as the material, thickness, and transport length of the plate material 106, the supply speed of the plate material 106 by the plate material supplying device 104 and the transport speed of the plate material 106 by the plate material feeding device 103 may be set so as to suppress the occurrence of fluttering.

The processing device 102 may be provided with a sensor for detecting the process of the processing device 102. For example, when the processing device 102 is a press device, an angle detector 110 such as an encoder for detecting the rotation angle of the crankshaft 109 may be provided as a sensor. The angle detector 110 detects the rotation angle of the crankshaft 109 as shown in FIG. 2A and FIG. 2B. Then, the output signal of the rotation angle detected by the angle detector 110 is transmitted to the control device 107. This allows the control device 107 to recognize the process of the processing device 102. For example, as shown in FIG. 2A, when the rotation angle of the crankshaft 109 is between 270° through 0° and 90°, the control device 107 can recognize that the process is a process in which the plate material 106 is moved according to the desired length by the plate material feed device 103. And, when the rotation angle of the crankshaft 109 is around 180°, the control device 107 can recognize that the process is a process in which the moved plate material 106 is processed. When the control device 107 recognizes that the rotation angle of the crankshaft 109 is 90°, it controls the workpiece feed device 103 to stop transporting the workpiece 106 to the processing device 102. Then, when the control device 107 recognizes that the rotation angle of the crankshaft 109 is 270°, it controls the workpiece feed device 103 to resume transporting the workpiece 106 to the processing device 102, and transports the workpiece 106 to the processing device 102 at a constant speed. In this way, the control device 107 can control the workpiece feed device 103 to intermittently transport the workpiece 106 to the processing device 102 in response to an output signal from the angle detector 110.

When the control device 107 recognizes that the rotation angle of the crankshaft 109 is between 270°, passing through 0°, and 90°, i.e., the process of moving the plate material 106 by the plate material feeder 103 according to the desired length, the control device 107 causes the plate material feeder 104 to feed the plate material 106 to the plate material feeder 103 at a first speed. When the control device 107 recognizes that the rotation angle of the crankshaft 109 is between 90°, passing through 180°, and 270°, i.e., the process of processing the plate material 106 is included, the control device 107 causes the plate material feeder 104 to feed the plate material 106 to the plate material feeder 103 at a second speed. When the control device 107 recognizes that the rotation angle of the crankshaft 109 is 90°, the control device 107 causes the plate material feeder 104 to change the speed at which the plate material 106 is fed to the plate material feeder 103 from the first speed to the second speed. Then, when the control device 107 recognizes that the rotation angle of the crankshaft 109 is 270°, it causes the plate material supplying device 104 to change the speed at which the plate material 106 is supplied to the plate material feeding device 103 from the second speed to the first speed. In this way, the control device 107 causes the plate material supplying device 104 to change the speed at which the plate material 106 is supplied to the plate material feeding device 103 in accordance with the output signal from the angle detector 110.

The processing line system 101 may include a lower limit sensor 113 that detects the lower limit of the loop of the plate material 106 formed in the space 108, a lower side sensor 114 that detects the lower side of the loop of the plate material 106, an upper side sensor 115 that detects the upper side of the loop of the plate material 106, and an upper limit sensor 116 that detects the upper limit of the loop of the plate material 106. The control device 107 can recognize the state of the loop of the plate material 106 in response to the output signals from each of the sensors 113 to 116, and can change the operating state, such as stopping the operation of the processing device 102, the plate material feed device 103, and the plate material supply device 104, depending on the state of the loop of the plate material 106, thereby suppressing the occurrence of fluttering.

By using the processing line system 101 of the present invention as described above, the plate material supplying device 104 can mitigate the effect of the inertial force generated due to the advancement and stopping of the plate material 106 by the plate material feeding device 103, and can supply the plate material 106 to the plate material feeding device 103, which intermittently conveys the plate material 106 to the processing device 102 such as a press device, with the occurrence of fluttering suppressed, the vibration of the plate material 106 suppressed, and also in response to the high speed processing such as press processing. Then, the processing device 102 such as a press device can process the plate material 106 intermittently conveyed with high precision from the plate material feeding device 103, such as press processing, to manufacture structures such as small parts used in information-related devices such as mobile phones and personal computers, components for automobiles, industrial motor parts, home appliances, etc.

Although the above description is given with respect to specific embodiments, it will be apparent to those skilled in the art that the invention is not limited thereto and that various changes and modifications can be made within the scope of the principles of the invention and the appended claims.

REFERENCE SIGNS LIST 101 Processing line system 102 Processing device 103 Plate material feed device 104 Plate material supply device 105 Uncoiler 106 Plate material 107 Control device 108 Space 109 Crankshaft 110 Angle detector 111 Upper die 112 Lower die 113 Lower limit sensor 114 Lower sensor 115 Upper sensor 116 Upper limit sensor

Claims (10)

A processing device for processing the plate material;
a workpiece feeding device that intermittently conveys the workpiece to the processing device;
a plate material supplying device that supplies the plate material from the uncoiler to the plate material feeding device ;
a control device for controlling the processing device, the workpiece feeding device, and the workpiece supply device;
A processing line system comprising:
the processing device includes a crankshaft and a die for processing the plate material, and the processing device has a first step of moving the plate material in a first rotation angle range within a rotation angle range of 0° to 360° of the crankshaft, and a second step of processing the plate material in a second rotation angle range within the rotation angle range;
the plate material supplying device is adapted to supply the plate material to the plate material feeding device at a first speed in the first step, and to supply the plate material to the plate material feeding device at a second speed in the second step ;
A processing line system in which the first rotation angle range is determined according to the type of mold, thereby enabling the control device to adjust the transport amount of the plate material supplied from the plate material supplying device to the processing device by the plate material feeding device to match the type of mold . The processing line system of claim 1 , wherein the first speed is greater than the second speed. The processing line system according to claim 1 or 2, wherein the plate material supplying device is capable of changing the speed at which the plate material is supplied to the plate material feeding device in accordance with the speed at which the plate material feeding device conveys the plate material to the processing device. The processing line system according to any one of claims 1 to 3, wherein the plate material supply device is capable of increasing the speed at which the plate material is supplied to the plate material feed device when the plate material feed device starts to transport the plate material, and decreasing the speed at which the plate material is supplied to the plate material feed device when the plate material feed device stops transporting the plate material. The processing line system according to any one of claims 1 to 4 , wherein the plate material supplying device is capable of changing the speed at which the plate material is supplied to the plate material feeding device so that the amount of the plate material supplied from the plate material supplying device to the plate material feeding device during one rotation of the crankshaft is substantially the same as the amount of the plate material transported from the plate material feeding device to the processing device. The processing line system according to any one of claims 1 to 5, wherein the plate material supply device constantly supplies the plate material to the plate material feed device. The processing line system according to any one of claims 1 to 6, wherein the workpiece supply device supplies the workpiece to the workpiece feed device when the workpiece feed device is not transporting the workpiece to the processing device. The processing line system according to any one of claims 1 to 7, wherein the speed at which the workpiece supply device supplies the workpiece to the workpiece feed device is different from the speed at which the workpiece feed device transports the workpiece to the processing device. The processing line system according to any one of claims 1 to 8, wherein the processing device is provided with an angle detector for detecting a rotation angle of the crankshaft , and the plate material feeding device is capable of intermittently transporting the plate material to the processing device in response to an output signal from the angle detector. 10. The processing line system according to claim 9, wherein the workpiece supply device is capable of changing a speed at which the workpiece is supplied to the workpiece feed device in response to an output signal from the angle detector .

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