JP2566680Y2 - Short-length material detection device for cutting mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a cutting mechanism for feeding a long wire to a position where it comes into contact with a stopper, and cutting the wire at a fixed length. The present invention relates to a short material detecting device that detects a cut short material.

[0002]

2. Description of the Related Art In a cutting mechanism for feeding a long wire to a position where it comes into contact with a stopper, a short length of material cut to a length shorter than a predetermined length due to a shortage of the feeding amount. Conventionally, as one of means for detecting the wire, a stopper is fixedly provided at a position where the tip of the wire comes into contact when the wire is sent out to a predetermined length, and one of the electrodes is on the stopper and the other is on the wire. In each case, devices having a connected structure were used. The current-carrying short material detecting device energizes by contacting the stopper when the wire is sent out to a predetermined length, and does not energize when the wire does not come into contact with the stopper because the sending length is insufficient. Therefore, by detecting the presence or absence of energization, it is detected whether or not the wire has been sent to a predetermined length and cut.

[0003]

SUMMARY OF THE INVENTION However, in the above-mentioned short material detecting device, the wire rod bounces due to collision with the stopper and separates from the stopper due to mechanical play in the clamping means of the wire feeder. If the wire is cut while the sending length of the wire is shorter than the predetermined length, since the wire is once energized due to the contact with the stopper, the wire is sent to the predetermined length and cut. Therefore, it is not possible to reliably detect the short material.

[0004]

According to the present invention, as a means for solving the above-mentioned problems , the wire is urged in the direction of the wire feeding direction so as to be movable in the length direction of the wire and by a spring force.
Fixed with the stopper and the immovable bracket
A distance measuring sensor that measures the distance to the laser beam, a timing processing device that outputs a timing signal for causing a reading of the measured value by the distance measuring sensor to be performed immediately before cutting, every time a wire is transmitted,
The measured value is a structure consisting of a comparison device for outputting an abnormality detection signal when an out-of-tolerance by comparing the measured values of the allowable range as the distance measuring sensor which is arbitrarily set.

[0005]

The wire delivered by the drive of the wire delivery machine abuts against the stopper before the delivery is completed, and moves further while pushing the stopper against the spring force to deliver the wire. After the movement of the wire rod is stopped by stopping the driving of the wire rod, the wire rod bounces and recedes due to the mechanical play of the clamp means of the wire rod feeder, but the stopper follows the wire rod due to the repulsive force of the spring. Move. According to the timing signal output from the timing processing device, the sensor measures the position of the stopper immediately before cutting is performed, and when the measured value of the sensor is within a predetermined allowable range,
It is determined that the cutting of the predetermined length has been performed, and the feeding and cutting of the wire rod are subsequently performed.

If 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 is short.

[0007] As described in the above operation, the short material detecting device of the present invention cuts off a wire that has been sent out to a predetermined length once and cuts into a short size by bounding and returning. It is possible to reliably detect that the wire is short.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

The long wire material A is sent out in the direction of the arrow by a predetermined length by driving a cutting mechanism in a forging machine (not shown), and cut into the same size as the sending length.

[0010] A stopper 1 is positioned and fixed on a support 1 fixedly provided in front of the wire A in a feeding direction by fitting a projection 3 on an upper surface thereof into a fitting groove 4 of the support 1. I have. In the stopper 2, a holding cylinder 6 concentric with the wire A is fitted in the fitting hole 5, and a locking wall located on the side (rear side) opposite to the wire A with respect to the fitting hole 5. 7 are formed.

The holding tube 6 of the stopper holder 2 has a rod-shaped stopper 8 projecting into the holding tube 6 with its end 9 on the side (front side) facing the wire A protruding from the holding tube 6. The projection 10 and the elongated hole 11 on the outer periphery of the stopper 8 are fitted so as to be unrotatable around the axis and slidable in the axial direction.

A portion 12 of the stopper 8 projecting rearward from the holding cylinder 6 movably penetrates a through hole 13 of the locking wall 7, and a screw portion 14 projecting rearward from the through hole 13.
, A locking flange 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 a spring receiver 18 locked to the step 17 of the stopper 8, and the elasticity of the disc spring 19 causes the stopper 8 to send out the wire A. A moving force in the opposite direction is provided.

By the bias of the disc spring 19, as shown in FIG. 1, the stopper 8 is always held at a standby position where the stopper flange 15 comes into contact with the rear surface of the retaining wall 7. I have. In such a state, a gap X is formed between a rear surface of the regulating flange 20 formed at a position protruding forward from the holding tube 6 of the stopper 8 and a front end surface of the holding tube 6. The stop 8 can move backward by X.

The stopper plate 2 has a mounting plate 2 at its rear end.
The bracket 22 forming the third part 3 is fixed. A screw hole 24 concentric with the stopper 8 is formed in the mounting plate portion 23 of the bracket 22, and a distance measuring sensor 25 having a front measuring portion 25 a facing the rear end surface of the stopper 8 is formed in the screw hole 24. Are screwed into a pair of locking nuts 26, 2
6 is immovably fixed. This distance measuring sensor 2
Numeral 5 detects the position of the stopper 8 by measuring the distance between the stopper 8 and the rear end face.
In the state shown in FIG. 1 in which the stopper 8 is held at the standby position by the urging of the disc spring 19, a gap X is provided between the measuring portion 25a of the distance measuring sensor 25 and the rear end surface of the stopper 8.
An interval Y having a size larger than that is made empty.

The distance measuring sensor 25 is connected to a control device 31 via a setting comparing device (corresponding to a comparing device which is a component of the present invention) 30. The setting comparison device 30 sets the allowable range of the measured value of the distance measuring sensor 25, and compares the allowable range with the measured value of the distance measuring sensor 25, and determines that the measured value is out of the allowable range. An abnormality detection signal is output to the control device 31 at the same time. The control device 31 is provided with a timing processing device 33 that outputs a timing signal for causing the distance measurement sensor 25 to read a measurement value immediately before the cutting of the wire A based on a detection value of the encoder 32 attached to the cutting mechanism. ing.

Next, the operation of this embodiment will be described. Prior to the operation, the setting comparison device 30 sets an allowable range of the measurement value of the distance measurement sensor 25. The value of the allowable range is determined by the distance measuring sensor 2 when the stopper 8 moves to the rearmost position.
The dimension YX, which is the distance between the step 5 and the stopper 8, is set to the minimum value, and the maximum value is appropriately set to a value smaller than the dimension Y according to the processing conditions and the like.

After setting the allowable range as described above, the wire A is sent and cut. The wire A to be delivered abuts its front end face against the front end face 8a of the stopper 8 immediately before the end of the sending operation by the cutting mechanism, and then pushes the stopper 8 backward against the urging 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 a state of contact with the wire A.

After that, the distance measuring sensor 25 reads the measured value of the interval facing the rear end face 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 compared with the setting comparison. The data is input to the 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 out to a predetermined length and cut, the measured value of the distance measuring sensor 25 is within an allowable range. In this case, the abnormality detection signal from the setting comparing device 30 is No output is performed, and the next transmission and disconnection are performed.

When the cut length of the cut wire A is shorter than the predetermined length because the length of the wire A is shorter than the predetermined length, the measured value of the distance measuring sensor 25 is outside the allowable range. In this case, 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, and operations such as removal of the short material are performed.

When the wire A is once sent out to an appropriate length and bounces back due to the collision with the stopper 8, the stopper 8 returns to the wire A returning by the elastic force of the disc spring 19. It follows and moves forward, and stops moving when it comes into contact with the 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 sent and cut, and the bound amount is large and the measured value is out of the allowable range. In the event that the condition is not satisfied, an abnormality detection signal is output from the setting comparison device 30, and the short-sized member is detected.

Incidentally, when the feeding is completed before the wire A comes into contact with the stopper 8 at the standby position shown in FIG.
If the bounding amount of the wire A is larger than the distance that the stop 8 can follow, the cutting is performed in a state where the wire A is separated from the stop 8 at the standby position. Since the value is out of the permissible range, the setting comparison device 30 outputs an abnormality detection signal and detects the short dimension material.

[Brief description of the drawings]

FIG. 1 is a configuration 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)

(57) [Scope of request for utility model registration] Movably in claim 1. A wire length direction, and it is urged in the feed direction and opposite direction of the wire by a spring force Sutotsu
The distance between the stopper and the fixed
A distance measuring sensor for measuring the distance , a timing processing device for outputting a timing signal for reading the measured value by the distance measuring sensor immediately before cutting, every time the wire is transmitted, an arbitrarily set allowable range and the distance measuring short-sized material detection device of the cutting mechanism which measured value is compared with the measured value of the sensor is composed of a comparison device for outputting an abnormality detection signal when an out-of-tolerance.