JPH06114474A - Transfer device - Google Patents

Abstract

PURPOSE:To prevent generation of deviated positioning of a work when clamping is released in a transfer device. CONSTITUTION:A clamp main body 2 is provided with a guide member 3. A rod 4 is inserted through the guide member 3 in a sliding state. A holder 5 by which fingers are connected is fitted on the tip end of the rod 4. A permanent magnet 13 is fitted on the base end part of the rod 4. An electromagnet 14 is fitted on the clamp main body 2. The clamp main body 2 is fitted on a feeding bar of the transfer device. When the work is clamped, the electromagnet 14 is energized and a repulsion is generated between the electromagnet 14 and the permanent magnet 13 and the finger is energized toward the work to secure clamping. When clamping is released, energizing to the electromagnet 14 is stopped to eliminate the energizing force to the finger. The deviated positioning for the work is prevented since the work is not extruded by the finger when the work is separated from the finger.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer device for automatically transferring a work between a plurality of processes.

[0002]

2. Description of the Related Art As a processing machine using a transfer device, there is a transfer press, for example. The transfer press is one in which press dies having a required number of steps are arranged at a predetermined interval in one press machine, and a work in each step is automatically conveyed by a transfer device to continuously and consistently process. As a prior art relating to this type of transfer press, for example, there is one described in Japanese Utility Model Laid-Open No. 63-16520.

The transfer device of the transfer press will be described below. This transfer device has feed bars arranged on both sides of a press die arranged along the transport direction, and a plurality of fingers are attached to the feed bar at predetermined intervals so as to face each press die. Has been done. Then, the feed bar is brought close to the work on the press die to hold the work by the fingers, and the feed bar is moved in the transport direction to convey the work between the adjacent press dies.

Conventionally, the fingers mounted on one of the feed bars arranged on both sides of the work are attached to the feed bar via a clamp mechanism as shown in FIG. 2, for example. As shown in FIG. 2, in the clamp mechanism 1, a cylindrical guide member 3 is provided on a clamp body 2 fixed to a feed bar, and the guide member 3 has a rod 4
Is slidably inserted. At the tip of the rod 4,
A holder 5 is attached, and as shown in FIG. 3, a finger 7 is attached to the holder 5 via a bracket 6. Further, the guide member 3 and the rod 4 constitute a supporting means for supporting the finger 7 so as to be movable back and forth,
As the rod 4 slides, the fingers 7 move back and forth with respect to the work W to be clamped.

The clamp body 2 is provided with a stopper 8 facing the base end portion of the rod 4. A compression spring 9 is interposed between the base end of the rod 4 and the stopper 8. Then, the spring 9 urges the rod 4 toward the work W by its elastic force, and the stopper 8 regulates the movement of the rod 4 in the direction away from the work.

A detector 10 is attached to the rod 4, and a proximity switch 11 for detecting the position of the detector 10 is provided on the clamp body 2. And rod 4
The detector 10 is out of the detection range of the proximity switch in the state in which is moved to the work W side by the urging force of the spring 9,
Further, when the rod 4 moves to a predetermined position against the biasing force of the spring 9, the detector 10 comes to be within the detection range of the proximity switch 11.

On the other hand, the feed bar arranged on the opposite side of the feed bar on which the clamp mechanism 1 is provided is not provided with such a clamp mechanism and the fingers are fixed thereto.

With this structure, when the feed bars on both sides of the work W are moved toward the work W, the fingers attached to the respective feed bars abut from both sides of the work W and hold the work W. At this time, the fingers 7 of the clamp mechanism 1 come into contact with the work W to move the rod 4 against the elastic force of the spring 9. Therefore, finger 7
Since the elastic force of the spring 9 urges the work W toward the work W to elastically support the work W, variations in the outer dimensions of the work W are absorbed and the work W is reliably clamped.

When the finger 7 clamps the work W, the rod 4 moves against the elastic force of the spring 9 and moves the detector 10 within the detection range of the proximity switch 11.
Therefore, by detecting the movement of the detector 10 by the proximity switch 11, it is possible to confirm that the workpiece W is securely clamped.

[0010]

However, in the transfer device using the above-mentioned conventional clamp mechanism 1, when the feed bar is separated from the work W when the work W is released from the clamp, the spring 9 is elastically repulsed. The rod 4 moves toward the work W and the fingers 7 connected to the holder 5 push out the work W, which may cause the work W to be displaced from a predetermined processing position. When the work W deviates from a predetermined processing position, there arise problems that a work defect such as uneven thickness occurs, or the work W does not fit in the press die and the press work is stopped.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a transfer device for preventing displacement of a work.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention holds a work by sandwiching the work and bringing feed bars arranged on both sides close to the work and holding the work with fingers attached to the feed bar. In a transfer device that conveys the workpieces in one direction, a support means that supports the fingers so that they can move back and forth with respect to the work, and a biasing force that biases the fingers toward the work can be generated and eliminated on one side of the feed bar. And a clamp mechanism provided with the means.

[0013]

With this structure, when the work is clamped, the work can be elastically supported by urging the fingers toward the work by the urging means, and the work can be clamped. When releasing, the fingers can be prevented from pushing out the work by releasing the urging force of the urging means.

[0014]

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

The transfer device of this embodiment is different from the above-mentioned conventional transfer device only in the biasing means of the clamp mechanism. Therefore, the members similar to those of the conventional example shown in FIGS. 2 and 3 will be described below. The same numbers are given and only different parts will be described in detail.

As shown in FIG. 1, the clamp mechanism 12 has a permanent magnet 13 attached to the base end of the rod 4, and the clamp body 2 is provided with an electromagnet 14 facing the permanent magnet 13. . An urging means is formed by the permanent magnet 13 and the electromagnet 14, and the electromagnet 14 is energized to generate a repulsive force with the opposing surfaces of the permanent magnet 13 and the electromagnet 14 as the same pole, and this repulsive force causes the rod 4 to work on the work W. It is supposed to urge towards. That is, the energization of the electromagnet 14 is turned on and off to apply or cancel the biasing force to the rod 4.

The operation of this embodiment having the above-mentioned structure will be described below.

When clamping the work W, an electromagnet is used.
14 is energized to generate a repulsive force between the permanent magnet 13 and the permanent magnet 13 to urge the rod 4 toward the work W. When the feed bars on both sides of the work W are brought close to the work W in this state, the fingers attached to the respective feed bars abut from both sides of the work W and hold the work W therebetween. At this time, the fingers 7 connected to the clamp mechanism 12 are the permanent magnets 13
Since the work W is urged by the repulsive force of the electromagnet 14 and abuts against the work W to elastically support the work W, variations in the outer dimensions of the work W are absorbed and the work W can be reliably clamped.

When the finger 7 clamps the work W, the rod 4 moves against the repulsive force of the permanent magnet 13 and the electromagnet 14 to move the detector 10 within the detection range of the proximity switch 11. Therefore, by detecting the movement of the detector 10 by the proximity switch 11, it is possible to confirm that the workpiece W is securely clamped.

By moving the feed bar in the carrying direction by a predetermined amount while the work W is clamped, the work W in each process is carried to the press die of the next process.

When unclamping the work W,
The power supply to the electromagnet 14 is stopped, and the feed bars on both sides of the work W are separated from the work W. By stopping the energization of the electromagnet 14, the urging force acting on the rod 4 is released, and when the work W is separated from the finger,
It will not be pushed out by the rod 4 and will not deviate from the predetermined processing position.

As described above, when the work W is clamped, the work W can be reliably clamped by energizing the electromagnet 14 to urge the fingers toward the work W, and the work W can be clamped. When the work W is released, the energization of the electromagnet 14 is stopped to cancel the urging force to the finger, whereby the work W can be prevented from being displaced when the work W is separated from the finger.

In this embodiment, as the urging means, the permanent magnet 13 and the electromagnet 14 are used to apply the urging force to the fingers, and the urging force is eliminated. It is also possible to use an actuator or the like capable of causing the action of, and canceling the biasing force.

[0024]

As described in detail above, according to the transfer device of the present invention, when the work is clamped, the work is elastically supported by urging the fingers toward the work by the urging means. Further, when the clamp of the work is released, it is possible to prevent the finger from pushing the work by releasing the biasing force of the biasing means. As a result, it is possible to reliably clamp the work, and it is possible to prevent the work from being displaced when the clamp is released.

[Brief description of drawings]

FIG. 1 is a diagram showing a clamp mechanism that is a main part of an embodiment of the present invention.

FIG. 2 is a view showing a clamp mechanism of a conventional transfer device.

FIG. 3 is a diagram showing a connecting portion between a finger of the transfer device and a clamp mechanism.

[Explanation of symbols]

 3 Guide Member (Supporting Means) 4 Rod (Supporting Means) 7 Finger 12 Clamping Mechanism 13 Permanent Magnet (Biasing Means) 14 Electromagnet (Biasing Means) W Work

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[Procedure amendment]

[Submission date] April 1, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

Claims (1)

[Claims] 1. A transfer device in which a feed bar disposed on both sides of a work is brought close to the work, and a work is held by a finger mounted on the feed bar to convey the work. The transfer device is provided with a clamp mechanism including a support means for supporting the finger to move forward and backward, and a biasing means capable of generating and canceling a biasing force for biasing the finger toward the work. .