JPH0528532U - Short-sized material detector for cutting - Google Patents

Abstract

(57) [Abstract] [Purpose] In a cutting mechanism that feeds wire material to a position where it abuts on the stopper by a fixed length and cuts, the wire material collides with the stopper and bounces to cut into a dimension shorter than a predetermined length. If it is, it will definitely be detected. [Structure] The delivered wire A moves the stopper 8 into a disc spring 19
When the movement is stopped in the state of being pushed against the urging force of, the distance measuring sensor 25 reads the measured value of the facing distance with the stopper 8 immediately before disconnection by the timing signal, and the measured value is compared with the allowable range. It When the cut length of the wire A is shorter than the predetermined dimension, the measured value is out of the allowable range, so that the abnormality detection signal is output. When the wire A bounces,
Since the stopper 8 moves by the biasing of the disc spring 19 and contacts the wire A, the measured value is read by the distance measuring sensor 25. Therefore, it is sure that the wire A is cut into a short-sized material. To be detected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a cutting mechanism that feeds and cuts a long wire to a position where it abuts on a stopper by a fixed length, and a short material cut into a dimension shorter than a predetermined length due to insufficient feeding amount. The present invention relates to a short-sized material detecting device for detecting.

[0002]

[Prior Art]

 In a cutting mechanism that feeds a long wire to a position where it abuts the stopper by a fixed length and cuts it, a cutting mechanism for detecting a short wire cut into a dimension shorter than a predetermined length due to insufficient feeding amount. As one of the conventional methods, a structure is provided in which a stopper is fixedly provided at a position where the tip of the wire abuts when it is delivered to a predetermined length, and one of the electrodes is connected to the stopper and the other is connected to the wire. Was used. This energization type short material detection device energizes by contact with the stopper when the wire is delivered to a predetermined length, and does not energize when the delivery length is insufficient and the wire does not contact the stopper. As a result, by detecting the presence or absence of energization, it is possible to detect whether or not the wire rod has been sent to a predetermined length and cut.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned short-sized wire detection device, since there is mechanical backlash in the clamping means of the wire material delivery machine, the wire material bounces due to the collision with the stopper and separates from the stopper, and the wire delivery length exceeds the predetermined length. If the wire rod is cut in a short state, the wire rod once comes into contact with the stopper to energize the wire rod, and it is erroneously determined that the wire rod has been cut to a predetermined length. However, it was not possible to reliably detect short length materials.

[0004]

[Means for Solving the Problems]

 As a means for solving the above problems, the present invention provides a stopper movably in the length direction of a wire rod and urged by a spring force in the direction opposite to the feeding direction, and the stopper position is set. Compare the sensor to be measured with the timing processing device that outputs the timing signal that causes the sensor to read the measured value immediately before cutting, every time the wire rod is sent out, and compare the measured value of the sensor with the arbitrarily set allowable range. It was configured with a comparator that outputs an abnormality detection signal when the measured value is outside the allowable range.

[0005]

[Operation and effect of the device]

 The wire fed by the drive of the wire feeder comes into contact with the stopper before the feeding is completed, and further moves while pushing the stopper against the spring force, so that the drive of the wire feeder is stopped. After the movement of the wire rod is stopped, the wire rod bounces and retracts due to the mechanical backlash of the clamping means of the wire rod feeder, but the stopper moves following the wire rod by the repulsive force of the spring. The timing signal output from the timing processor causes the sensor to measure the position of the stopper immediately before the disconnection, and if the measured value of the sensor is within the preset allowable range, the disconnection of the specified length will occur. It is judged that the wire rod has been delivered, and the wire rod is continuously delivered and cut.

When the measured value of the sensor is out of the allowable range, an abnormality detection signal is output from the comparison device and it is detected that the cut wire rod is a short length rod.

As described in the above operation, the short-sized material detecting device of the present invention cuts a wire once it has been sent to a predetermined length and bounces back to cut into a short dimension. It is possible to reliably detect that the broken wire is a short size wire.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings.

The long wire A is sent out in a direction of an arrow at a constant length by driving a cutting mechanism in a press machine (not shown) and cut into the same size as the sent length.

The stopper holder 2 is positioned and fixed to the support body 1 which is fixedly provided on the front side in the feeding direction of the wire A by fitting the projection 3 on the upper surface thereof into the fitting groove 4 of the support body 1. Has been. In the stopper holder 2, a holding tube 6 concentric with the wire A is fitted in the fitting hole 5, and a locking wall located on the opposite side (rear side) of the fitting hole 5 from the wire A. 7 are formed.

The holding cylinder 6 of the stopper holder 2 has a rod-shaped stopper 8 inside the holding cylinder 6 in a state in which an end portion 9 on the side (front side) facing the wire A is projected from the holding cylinder 6. The protruding projection 10 and the elongated hole 11 on the outer circumference of the stopper 8 are fitted together so that they cannot rotate around the axis and can slide freely in the axial direction.

A portion 12 of the stopper 8 projecting rearward from the holding cylinder 6 penetrates through a through hole 13 of the locking wall 7 freely, and is engaged with a screw portion 14 projecting rearward from the through hole 13. The collar 15 is screwed and fixed by a nut 16. A disc spring 19 is mounted between the front surface of the locking wall 7 and the spring receiver 18 locked to the step portion 17 of the stopper 8. The elastic force of the disc spring 19 causes the stopper 8 to move the stopper 8 of the wire A. It is given a moving force in the opposite direction to the sending direction.

As shown in FIG. 1, the biasing force of the disc spring 19 causes the stopper 8 to always be held in the standby position where the stopper collar 15 is brought into contact with the rear surface of the stopper wall 7. There is. In such a state, a gap X is formed between the rear surface of the regulating collar 20 formed at the position projecting forward from the holding cylinder 6 of the stopper 8 and the front end surface of the holding cylinder 6. The stopper 8 can be moved backward by the dimension X.

A bracket 22 having a mounting plate portion 23 formed at the rear end is fixed to the stopper holder 2. A screw hole 24 that is concentric with the stopper 8 is formed in the mounting plate portion 23 of the bracket 22, and the distance measuring sensor 25 in which the front measuring portion 25a is opposed to the rear end surface of the stopper 8 is formed in the screw hole 24. Are screwed together and fixed immovably by a pair of lock nuts 26, 26. The distance measuring sensor 25 detects the position of the stopper 8 by measuring the distance from the rear end surface of the stopper 8. Further, between the measuring portion 25a of the distance measuring sensor 25 and the rear end surface of the stopper 8, in the state shown in FIG. Also, a large interval Y is provided.

The distance measuring sensor 25 is connected to a control device 31 via a setting comparison device (corresponding to a comparison device which is a component of the present invention) 30. In the setting comparison device 30, when the permissible range of the measured value of the distance measuring sensor 25 is set, and the permissible range is compared with the measured value of the distance measuring sensor 25 and the measured value is outside the permissible range. In addition, an abnormality detection signal is output to the control device 31. The control device 31 includes a timing processing device 33 that outputs a timing signal that causes the distance measuring sensor 25 to read the measured value immediately before the cutting of the wire A based on the detected value of the encoder 32 attached to the cutting mechanism. It is provided.

Next, the operation of this embodiment will be described. Prior to operation, the setting comparison device 30 sets an allowable range of the measured value of the distance measuring sensor 25. The value of this allowable range has a minimum value of the dimension Y-X which is the facing distance between the distance measuring sensor 25 and the stopper 8 when the stopper 8 moves to the rearmost, and the maximum value is smaller than the dimension Y. Set appropriately according to the conditions.

After setting the allowable range in this way, the wire A is fed and cut. The wire A to be sent out abuts its front end surface against the front end surface 8a of the stopper 8 immediately before the operation of the cutting mechanism finishes, and then pushes the stopper 8 backward against the bias of the disc spring 19. Move further while moving. When the driving of the cutting mechanism is stopped, the movement of the wire A is stopped, and the stopper 8 is held in contact with the wire A.

After that, the distance measuring sensor 25 reads the measured value of the facing distance to the rear end surface of the stopper 8 immediately before the wire A is cut by the timing signal from the timing processing device 33, and the measured value is set. It is input to the comparison device 30 and compared with the allowable range. Then, immediately after the measurement by the distance measuring sensor 25 is performed, the wire A is cut.

When the wire A is sent to a predetermined length and cut, the measured value of the distance measuring sensor 25 is within the allowable range. In this case, the setting comparison device 30 detects an abnormality detection signal. Is not output, and the next transmission and disconnection continue.

When the delivery length of the wire A is not the predetermined size and the cut wire A becomes a short size shorter than the predetermined size, the measurement value of the distance measuring sensor 25 is out of the allowable range. In this case, however, an abnormality detection signal is output from the setting comparison device 30 to the control device 31, and the next sending and cutting are interrupted to perform work such as removing short-sized material.

Further, when the wire A is once delivered to an appropriate length and bounces due to the collision with the stopper 8, the stopper 8 moves back due to the resilience of the disc spring 19. It moves forward following A and stops when it comes into contact with wire A. As a result, when the bounce amount is small and the measured value of the distance measuring sensor 25 is within the allowable range, the wire A is continuously fed and cut, and the bound amount is large and the measured value is outside the allowable range. In this case, the setting comparison device 30 outputs an abnormality detection signal to detect the short material.

When the delivery is completed before the wire A comes into contact with the stopper 8 at the standby position shown in FIG. 1, and when the bound amount of the wire A is larger than the distance that the stopper 8 can follow. Is cut with the wire A separated from the stopper 8 in the standby position, but the measured value of the distance measuring sensor 25 is also outside the allowable range at this time, and therefore the setting comparison device 30 detects an abnormality. A signal is output to detect the short material.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

[Explanation of symbols]

 A wire rod 8 Stopper 19 Disc spring 25 Distance measuring sensor 30 Setting comparison device 33 Timing processing device

Claims (1)

[Scope of utility model registration request] 1. A cutting mechanism for feeding a long wire to a position where it abuts on a stopper by a predetermined length and cutting the stopper so that the stopper can be moved in the length direction of the wire and is fed by a spring force. A sensor that measures the position of the stopper, and a timing processing device that outputs a timing signal that causes the sensor to read the measured value immediately before cutting, each time the wire rod is sent, Detection of short-sized material of cutting mechanism, comprising: a comparison device that compares a set allowable range with a measured value of the sensor and outputs an abnormality detection signal when the measured value is outside the allowable range. apparatus.