JPH0577155A - Wire guiding method and apparatus for wire cutting machine - Google Patents

Abstract

(57) [Abstract] [Purpose] In the process of pulling out the wire from the reel, it is possible to move the pair of guide rollers in the wire displacement correction direction and at the same time control the feed speed of the guide roller according to the degree of displacement of the wire. To do so. In a process of feeding a wire drawn from a reel through a pair of freely rotatable guide rollers in a separated state, the feed direction of the pair of guide rollers is determined from the rotation of one of the guide rollers, and at the same time during the rotation. The degree of wire displacement is detected from the rotation speed of the guide rollers, and the feed speed of the pair of guide rollers is determined according to the degree of displacement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a wire cutting machine,
In particular, the present invention relates to a method and apparatus for automatically setting the wire being pulled out to a state substantially orthogonal to the axis of the reel by moving the positions of the pair of guide rollers in the process of pulling out the wire from the reel.

[0002]

2. Description of the Related Art JP-A-61-10036
Japanese Patent Publication No. 3 discloses a wire guide mechanism in a wire type cutting device. In the wire guide mechanism, the pair of guide rollers are guided in the axial direction of the reel according to the displacement of the wire, but the feed speed at the time of the guide is set in advance and fixed regardless of the degree of displacement of the wire. Has been done. Therefore, in the process of correcting the position of the guide roller, the wire being drawn out transiently frictionally rubs against the adjacent wire in the wound state in accordance with the slow feed speed, and the wire is easily damaged or broken. Become.

[0003]

It is an object of the present invention to feed and move a pair of guide rollers in a wire displacement correcting direction in the process of pulling out the wire from the reel, and at the same time control the feed speed of the guide roller according to the displacement of the wire. It is to be able to do it.

[0004]

According to the present invention, in the process of feeding a wire drawn from a reel through a pair of freely rotatable guide rollers in a separated state, one of the pair of guide rollers is rotated to rotate a pair of guide rollers. The feed direction of the guide rollers is determined, at the same time, the degree of displacement of the wire is detected from the rotational speed of the rotating guide rollers, and the feed speed of the pair of guide rollers is determined according to the degree of displacement. ..

According to this control, the wire being pulled out is promptly corrected in a direction orthogonal to the axis of the reel irrespective of the change in the wire pulling speed, so that the position of the wire in the guiding direction is promptly corrected. As a result, there is no frictional rubbing between the wire being pulled out and the wire wound next to it, and damage to the wire and accidental cutting can be prevented.

[0006]

1 and 2 show a wire guide device 1 of a wire cutting machine. The wire 2 is wound around a freely rotatable reel 3 in order, passes between a pair of guide rollers 41, 42, and is guided to a cutting position via a plurality of grooved guide rollers 5.

The pair of guide rollers 41, 42 are connected to the wire 2
It is supported in a freely rotatable state with respect to the saddle 6 in a separated state while forming a space slightly larger than the diameter of the saddle 6.
Rotation detectors 51 and 52 are connected to the shafts of these guide rollers 41 and 42, respectively.

The saddle 6 is movable with respect to a guide frame 7 which is parallel to the axial direction of the reel 3, and a feed nut 8 fixed to the saddle 6 is parallel to the guide frame 7 and is thereby rotatable. It is connected to the supported feed screw 9 under a screw pair. Here, the saddle 6, the guide frame 7, the feed nut 8, and the feed screw 9 constitute a screw type feed means 10. The feed screw 9 is directly or by a drive motor 11 for driving the feed means 10 or a transmission means 12 for winding a timing belt or a pulley.
It is designed to be driven indirectly.

Next, FIG. 3 shows the rotation control section 13 of the drive motor 11. The rotation control unit 13 is connected to the corresponding rotation detectors 51 and 52 by input terminals 141 and 142 for on / off-rotation direction command and input terminals 151 and 152 for speed command, respectively, and is output terminal 16 at the output terminal 16. It is connected to the drive motor 11.

In the process of pulling out the wire 2 from the reel 3, the wire 2 in the pulled-out state is guided by a pair of guide rollers 41,
If the wire 2 being pulled out is in a direction orthogonal to the axial direction of the reel 3 as long as it is not in contact with any of the wires 42, the wire 2 adjacent to the wound wire 2 or the like is frictionally contacted. It is pulled out without rubbing. At this time, since neither of the guide rollers 41 and 42 is rotated, the rotation control unit 13 keeps the drive motor 11 stopped.

When the pulling out of the wire 2 advances and the pulling out position of the wire 2 is displaced leftward in FIG. 1, for example, and the wire 2 being pulled out comes into contact with the guide roller 41, the guide roller 4
Since 1 rotates in the counterclockwise direction, the rotation detector 51 generates an output voltage and gives the input terminal 141 of the rotation control unit 13 a signal in the rotation direction in which the displacement of the wire 2 is eliminated. Therefore, the rotation controller 13 activates the drive motor 11 and drives the feeding means 10 to eliminate the displacement of the wire 2 being pulled out, that is, the pair of guide rollers 41 and 42 to the left in FIG. To move.

Here, in the process of pulling out the wire 2,
A frictional rotation transmission force is generated between the wire 2 and the guide roller 41 according to the degree of the displacement, so that the guide roller 4
The rotation speed of 1 is proportional to the degree of displacement of the wire 2. Therefore, the output voltage of the rotation detector 51 is sent to the input terminal 151 as a signal of the rotation speed for the drive motor 11 according to the degree of displacement of the wire 2. Therefore, the rotation control unit 13 determines the speed of the drive motor 11 on the basis of the output voltage of the rotation detector 51, so as to determine the speed of the wire 2 being pulled out.
The feeding speed of the saddle 6 is decided each time. Eventually,
Since the displacement of the wire 2 is eliminated, the rotation control unit 13 stops the drive motor 11 according to the disappearance of the output voltage from the rotation detector 51.

As described above, the rotation control unit 13 constantly controls the drive motor 1 according to the degree of displacement of the wire 2 being pulled out.
Since the rotational speed of 1 is adjusted, the acceleration and deceleration of the feeding means 10 are always performed in a smooth state. If the wire 2 tilts in the opposite direction during the pulling process, the guide roller 4
2 rotates, and in response to this, the rotation detector 52 gives an instruction to the input terminal 142 in a direction to cancel the displacement, and also gives a speed instruction to the input terminal 152 according to the degree of the displacement.

In this way, the rotation control section 13 simultaneously performs on / off control and rotation speed control in the rotation direction on the drive motor 11 in accordance with the output voltage from the rotation detectors 51 and 52.

The wire guide device 1 includes a wire 2
It is also used on the winding side of. In this case, the rotation control unit 1
3 detects the rotation of the reel 3 with a shaft encoder or the like, and moves the reel 3 in the winding direction by a preset winding pitch (the diameter of the wire 2) every rotation of the reel 3 to limit the folding position of the reel 3. The direction of rotation is changed by inputting the signal from a switch.

In the above embodiment, the control system of the rotation control unit 13 is an open loop system, but it may be constructed as a known closed control (feedback control) system. Further, the feeding means 10 is not of a screw type, but by winding a timing belt between a pair of timing pulleys and adjusting the rotational direction and rotational speed of the timing pulleys, the feeding direction of the saddle 6 interlocking with the timing belts and It can also be configured as a means for controlling the feed rate.

[0017]

According to the present invention, in the process of moving the pair of guide rollers according to the displacement of the wire drawn from the reel, the feed speed of the pair of guide rollers is set according to the degree of displacement of the wire. Even during the transitional process of the feed guide, rubbing between the wire being pulled out and the adjacent wound wire is eliminated, and damage and disconnection accidents can be reliably prevented, and the feed speed of the pair of guide rollers is always Since the feed rate is set according to the degree of displacement, the feed rate is always set based on smooth velocity characteristics, and sudden acceleration and deceleration are eliminated, and smooth velocity control is possible.

[Brief description of drawings]

FIG. 1 is a front view of a wire guide device of a wire cutting machine.

FIG. 2 is a side view of a wire guide device of a wire cutting machine.

FIG. 3 is a block diagram of a rotation control unit.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Wire guide device 2 Wire 3 Reel 41, 42 Guide roller 51, 52 Rotation detector 10 Feed means 11 Drive motor 13 Rotation control part

Claims (2)

[Claims] 1. A wire being pulled out from a reel is passed between a pair of freely rotatable guide rollers in a separated state, and the pair of guide rollers is moved in the axial direction of the reel so that the wire being pulled out is aligned with the axis of the reel. On the other hand, in the process of pulling out in the orthogonal state, the displacement direction of the wire is detected from the rotation of one of the guide rollers, the feed direction of the pair of guide rollers is determined, and the wire displacement is determined from the rotation speed of the rotating guide roller. A wire guide method for a wire-type cutting machine, which comprises detecting the degree and determining the feed rate of the pair of guide rollers based on the degree of the displacement. 2. A pair of guide rollers that are freely rotatable by sandwiching a wire pulled out from a reel in a separated state, a feeding unit that feeds and moves the pair of guide rollers in the axial direction of the reel, and drives the feeding unit. Drive motor,
A rotation detector connected to each guide roller to generate a rotation direction signal and a rotation speed signal, and an ON / OFF switch for the drive motor by inputting the rotation direction signal and the rotation speed signal from one of the rotation detectors. A wire guide device for a wire-type cutting machine, comprising: a rotation control unit that executes control and rotation direction / rotation speed control.