JP4412654B2 - Cap chip removal device - Google Patents

Description

  The present invention relates to a cap tip detaching device that can easily, reliably and stably remove a cap tip fitted to a tip of a shank of a resistance welder or a welding gun, and which does not damage the shank.

  Conventionally, spot welding has been widely used as one of welding means for joining metal members. In this spot welding, a welding gun with a cap tip fitted to the tip of the shank is used. However, if it is used for a long time, the tip shape of the cap tip will be deformed and worn, making it difficult to ensure welding quality. There was a point. Therefore, the cap tip is automatically polished periodically after a certain processing time or a certain number of welding points, or removed and replaced with a new one or a polished one to secure the tip shape of the cap tip.

On the other hand, recently, the rust-proofing treatment has been performed on the material to be welded with a chemical treatment agent, and the cap chip wears quickly, and the replacement frequency tends to increase. Do not fit. In view of this, an apparatus for automatically removing a cap chip has been proposed, for example, as shown in Patent Document 1, so that the cap chip can be replaced without stopping the line.
However, the conventional device inserts a plate-like lever into the gap between the cap tip and the shank, and removes the cap tip by applying the lever principle. The problem is that the corner of the shank or cap tip serving as a fulcrum is damaged. There was a point. In addition, there is a problem that the amount of insertion of the lever is not stable and the cap chip is not removed properly.
JP 2002-79382 A

  The present invention solves the above-described problems, and can easily and reliably remove the cap tip fitted to the tip of the shank of a resistance welder or a welding gun, and can damage the shank. It has been completed with the aim of providing a cap chip removal device that is not.

The cap chip removal device of the present invention made in order to solve the above problem, a cap chip removal device for removing the fitted cap chip shank tip of the resistance welding machine and a welding gun, the axis of the shank A fixed claw that advances from a direction perpendicular to the direction and contacts the lower end of the shank, a movable claw that advances together with the fixed claw and contacts the upper end of the cap chip, and a lever lever that extends behind the movable claw. It has a pivot mechanism that pivots around the pivoted part by moving and pushes down the movable claw away from the fixed claw to detach the cap chip from the shank. after advancing between the chip, also characterized in that a slide plate of the wedge-type rotating the lever so as to push down the movable pawl advancement movement of the slide plate It is.

  In the present invention, the fixed claw and the movable claw are aligned by moving the electrode between the shank and the cap chip with a robot or by moving the entire apparatus forward, and then the wedge-type slide plate is moved forward to make a lever. Since the lever of the type is rotated and the movable claw is pushed down, the shank is not damaged, and the cap chip can be removed easily, reliably and stably.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
1 is a front view showing a cap chip removing device of the present invention, FIG. 2 is a front view showing an operating state thereof, FIG. 3 is a plan view, and FIG. 4 is a perspective view of a claw portion.
In the figure, reference numeral 1 denotes a box-shaped device main body, and a fixing claw 2a for keeping a horizontal state is provided on the front side thereof. Reference numeral 3 denotes a lever lever that freely rotates with the pivoting portion 4 as a fulcrum. A movable claw 2b that forms a pair with the fixed claw 2a is formed at the tip.
The fixed claw 2a is designed to contact the shank S, and the movable claw 2b is designed to contact the cap chip T.

In the apparatus main body 1, the fixed claw 2 a and the movable claw 2 b are advanced between the shank S and the cap chip T, or the shank S and the cap chip T are advanced, and then the lever 3 is pushed down. A wedge-type slide plate 5 is provided.
This slide plate 5 can be moved back and forth on the rail 6 by an air cylinder 7 or the like, which is a general drive source installed on the rear side, and has a front-facing inclined surface 5a. The inclined surface 5 a is in contact with the lower surface of the lever 3. A roller 3a is attached to the rear end of the lever 3, and is configured to move smoothly on the inclined surface 5a.

  The rear portion of the lever lever 3 is always urged by a resilient material 8 such as a spring so as to be in close contact with the inclined surface 5a, thereby preventing the lever 3 from being lifted. In the illustrated example, the rear portion of the lever 3 and the slide plate 5 are connected by a spring material 8. In addition, a spring or the like that is always urged from the ceiling portion of the apparatus body 1 toward the lever 3. It is also possible to install a resilient material.

  A sensor 9 for confirming whether or not the shank S has been normally inserted into the nail and whether or not the cap chip T has been removed is attached to the apparatus body 1 or the vicinity of the apparatus body 1. As a result, reliable and stable cap chip removal can be performed.

  As shown in FIG. 4, the claw portion 6 includes a fixed claw 2 a that abuts against the shank S and maintains a horizontal state, and a movable claw 2 b that abuts against the cap chip T and rotates as the lever 3 rotates. It is supposed to consist of Further, a notch groove 2c for introducing a shank is formed in the claw portion.

Next, the cap chip removing operation by the apparatus of the present invention will be described with reference to FIGS.
First, as shown in FIG. 1, the shank S is inserted into the notch groove 2c of the claw portion. At this time, the fixed claw 2a and the movable claw 2b overlap each other, the upper surface of the fixed claw 2a contacts the shank S, and the lower surface of the movable claw 2b contacts the cap chip T. Moreover, since the fixed claw 2a and the movable claw 2b have flat surfaces, the shank S can be reliably guided to a predetermined position.

Next, as shown in FIG. 2, the air cylinder 7 is operated and the slide plate 5 attached to the rod 7 a is moved forward along the rail 6. By the forward movement of the slide plate 5, the rear end portion of the lever 3 gradually rises along the inclined surface 5a, and the lever 3 rotates about the pivoting portion 4, so that the movable claw 2b at the front end is pushed down. Will be. As a result, the cap chip T is easily removed from the shank S.
In other words, unlike the conventional method of prying with a single lever lever, in the present invention, it is possible to apply a force in the vertical direction (axial direction) by removing with two claws. Can be removed. Moreover, since the upper surface of the fixed claw 2a is in contact with the shank S, there is no possibility that the shank S will be damaged.
After removing the cap chip T in this way, the slide plate 5 is returned to the initial position, and thereafter the same operation is repeated.

In addition, a sensor 9 for confirming whether or not the shank S has been normally inserted into the nail and whether or not the cap chip T has been removed is attached to the apparatus body 1 or in the vicinity of the apparatus body 1. Therefore, the cap chip can be removed reliably and stably, and a mistake signal can be reliably handled by the failure signal from the sensor 9.
The above description has been given for the case where one apparatus of the present invention is used. However, as shown in FIG. 5, it is of course possible to set the upper and lower pairs and remove two cap chips at the same time. is there.

As is clear from the above description, the cap tip removing device of the present invention is a cap tip removing device for removing the cap tip T fitted to the tip of the shank of a resistance welder or a welding gun. A fixed claw 2a that keeps a horizontal state on the front side of the main body 1 and a lever lever 3 having a tip portion that is a movable claw 2b that is paired with the fixed claw 2a are attached. The fixed claw 2a and the movable claw 2b are Since the wedge-shaped slide plate 5 that rotates the lever 3 so as to push down the movable claw 2b is provided after being advanced between the cap chips T, the cap chip T fitted to the tip of the shank is provided. It can be removed easily, reliably and stably, and the shank T will not be damaged.
In addition, since the structure is simple and reduced in size and weight, for example, it can be incorporated into a transfer type to a welding machine electrode part, and further has an advantage of excellent durability and low running cost, There is also an advantage that various guns such as straight guns and X guns can be handled.

It is a front view which shows embodiment of this invention. It is a front view which shows the operation state of this invention. It is a top view which shows embodiment of this invention. It is a perspective view of a nail | claw part. It is a front view which shows other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2a Fixed claw 2b Movable claw 2c Notch groove 3 Lever lever 3a Roller 4 Pivoting part 5 Slide plate 5a Inclined surface 6 Rail 7 Drive part 8 Elastic material 9 Sensor S Shank T Cap chip

Claims (5)

A cap tip detaching device for removing a cap tip fitted to the tip of a shank of a resistance welder or a welding gun, and a fixed claw that advances from a direction perpendicular to the axial direction of the shank and closely contacts the lower end of the shank And a movable claw that moves forward together with the fixed claw and comes into close contact with the upper end of the cap chip, and a lever lever that extends rearward of the movable claw rotates to pivot about the pivoting portion to fix the movable claw. It has a pivoting mechanism that pushes it away from the shank and removes the cap chip from the shank. This pivot mechanism moves the claw part forward between the shank and the cap chip, and then moves the movable claw by the forward movement of the slide plate. A cap chip detaching device comprising a wedge-type slide plate that pivots a lever to be pushed down. The cap chip removal device according to claim 1, wherein the slide plate is movable back and forth by an air cylinder or the like. The cap chip removing device according to claim 1 or 2, wherein the slide plate has a front-facing inclined surface, and the inclined surface is in contact with the lower surface of the lever. The cap chip detaching device according to any one of claims 1 to 3, wherein a rear portion of the lever lever is urged by an elastic material so as to always come into close contact with the inclined surface. A sensor for confirming whether or not the shank has been normally inserted into the nail and whether or not the cap chip has been removed is attached to the apparatus main body or the vicinity of the apparatus main body. The cap chip removal apparatus as described.

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