JP2006102766A - Handy type cap tip dismounting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a handy type cap tip dismounting device which can simply, surely, and stably dismount a cap tip fitted on the tip end portion of the shank of a resistance welding machine or a welding gun without damaging the shank, and further which can be easily carried and used. <P>SOLUTION: The handy type cap tip dismounting device comprises a horizontal fixed pawl 2a arranged on the front side of a case 1 having a grip so as to come into close contact with the lower end portion of the shank S, and a movable pawl 2b which makes a pair with the fixed pawl 2a, and comes into close contact with the upper end portion of the cap tip T, and can turn about the base portion of the fixed pawl 2a serving as a fulcrum 4. In addition, in the case 1, a lever 3 which is elongatedly arranged in back of the movable pawl 2b, and can swivel about the fulcrum 4, a wedge type sliding plate 5 for turning the lever 3 so as to push down the movable pawl 2b, and a driving source 7 for moving the sliding plate 5 forward and backward are arranged. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is capable of easily, surely and stably removing the cap tip fitted to the tip of the shank of a resistance welding machine or a welding gun, not causing damage to the shank, and being freely carried and used. The present invention relates to a handy cap chip detaching device that can perform the above.

  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. Therefore, an automatic cap chip removal device 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 automatic cap tip removal device described in this publication inserts a fork-shaped lever into the gap between the cap tip and the shank, tilts the lever against the shank, and The cap chip is removed by prying it by applying the principle. In this case, there is a problem in that concentrated loads act on the corners of the shank and cap chip with which the lever comes into contact, and are easily damaged. In addition, there is a problem in that the amount of insertion of the lever into the gap between the cap chip and the shank is not stable, resulting in defective removal of the cap chip.
Furthermore, the conventional automatic cap chip removal device is used by being installed on a robot arm or the like, and there has been no handy type handheld by an operator. This is because, when a conventional installation type device is simply modified to a handy type, the reaction during the work is strong and dangerous, and it is heavy and inconvenient to handle, and the load on the shank and cap chip is large. This is because bending and scratches are likely to occur.
JP 2002-79382 A

  The present invention solves the above-mentioned 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. The present invention has been completed for the purpose of providing a handy cap chip detaching device that can be carried freely.

  The handy cap tip detaching device of the present invention made to solve the above problems is a handy cap tip detaching device for removing a cap tip fitted to the tip of a shank of a resistance welding machine or a welding gun. A horizontal fixed claw that is in close contact with the lower end of the shank on the front side of the case with a handle, and a pair of the fixed claw that is in close contact with the upper end of the cap chip and that rotates with the base of the fixed claw as a fulcrum A claw is provided, and a lever lever that swings around the fulcrum and extends behind the movable claw in the case, and a wedge-type slide plate that rotates the lever to push down the movable claw A drive source for moving the slide plate back and forth is provided.

  In the present invention, the operator inserts the fixed claw and the movable claw of the apparatus between the shank and the cap chip and aligns them, and then moves the wedge-type slide plate forward to rotate and move the lever-type lever. Since the claw is pushed down, the shank is supported by the surface with the fixed claw when the movable claw is pushed down, and the cap chip is also applied with a vertical force, so that the shank and the cap chip are not damaged. Moreover, it is possible to remove the cap chip easily, reliably and stably with a small force.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing a handy cap chip removing device of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a side view, and FIG. 4 is a perspective view of a claw portion.

In the figure, reference numeral 1 denotes a box-like case, and a handle 1a is provided on the upper part thereof. A fixing claw 2a that keeps a horizontal state so as to be in close contact with the lower end portion of the shank S on the front side of the case 1 and a pair of the fixing claw 2a are in close contact with the upper end portion of the cap chip T and the fixing claw 2a. A movable claw 2b that rotates with the base portion on the case side as a fulcrum 4 is provided.
Also, a lever-type lever 3 that extends behind the movable claw 2b and swings around the fulcrum 4 in the case 1 and a wedge-type that rotates the lever 3 so as to push down the movable claw 2b. A slide plate 5 and a drive source 7 for moving the slide plate 5 back and forth are provided.

The lever 3 is integrally formed of a movable claw 2b and a single bar, and is a lever type that freely rotates about a fulcrum 4 as a center.
Further, the fixed claw 2a is designed to contact the shank S, and the movable claw 2b is designed to contact the cap chip T. 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.

A wedge-type slide plate 5 that rotates the lever 3 so as to push down the movable claw 2b after the fixed claw 2a and the movable claw 2b are advanced between the shank S and the cap chip T is provided in the case 1. Yes. This slide plate 5 is movable back and forth on a rail 6 by a general drive source 7 such as an air cylinder installed on the rear side, and has a front-side inclined surface 5a. The inclined surface 5 a is in contact with the lower surface of the lever 3. In addition, 7a is a mechanical valve which operates an air cylinder.
Further, 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-type lever 3 is urged by a resilient material 8 such as a spring so as to be always in close contact with the inclined surface 5a, thereby preventing the lever 3 from being lifted. In the illustrated example, a resilient material such as a spring that is constantly urged toward the lever 3 from the ceiling of the case 1 is installed, but in addition, the rear portion of the lever 3 and the slide plate 5 are the spring material. 8 and the lever 3 can be always pulled toward the slide plate 5.

Next, the operation of removing the cap chip by the apparatus of the present invention will be described.
As shown in FIG. 1, first, 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 a flat surface and a notch groove 2c, the shank S can be reliably guided to a predetermined position in a correct posture.

Next, 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, the lever 3 rotates about the fulcrum 4, and the movable claw 2b at the tip is pushed down. It becomes.
At this time, unlike the conventional method of prying with one lever lever, in the present invention, by removing using two claws, a force in the vertical direction (axial direction) is applied. It can be reliably removed without being damaged.

That is, as shown in FIG. 5, the upper surface of the horizontal fixed claw 2 a contacts the lower step of the shank S while the lower surface of the movable claw 2 b contacts the upper end of the cap chip T. When the movable claw 2b is rotated around the fulcrum 4 with the fixed claw 2a left as it is, a force directed directly above the fixed claw 2a acts. Further, although a downward rotating moment is applied to the movable claw 2b, since the fulcrum 4 is located far away, the horizontal force that causes the twist is small, and most of the applied force is a vertically downward force. .
As a result, an axial pulling force acts between the cap chip T and the shank S, and the cap chip T is easily removed with a smaller force than the shank S. In addition, since the upper surface of the horizontal fixing claw 2a is in contact with the lower step of the shank S, it is not damaged by the conventional twist.
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.

  As is clear from the above description, the handy cap chip detaching device of the present invention is a handy cap chip detaching device, which is a horizontal surface closely contacting the lower end portion of the shank S on the front side of the case 1 with a handle. A fixed claw 2a and a movable claw 2b that is paired with the fixed claw 2a and is in close contact with the upper end of the cap chip T and that rotates with the base of the fixed claw 2a as a fulcrum 4 are provided in the case 1. 2b, a lever lever 3 that swings around the fulcrum 4 and that extends around the fulcrum 4, a wedge-type slide plate 5 that rotates the lever 3 so as to push down the movable claw 2b, and the slide plate 5 Since the drive source 7 that moves back and forth is provided, the cap chip T fitted to the tip of the shank can be removed easily, reliably and stably, and the shank T may be damaged. It is intended.

It is a front view which shows embodiment of this invention. It is a top view which shows embodiment of this invention. It is a side view which shows embodiment of this invention. It is a perspective view of a nail | claw part. It is explanatory drawing of the removal operation | movement of a cap chip | tip.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2a Fixed nail | claw 2b Movable nail | claw 2c Notch groove 3 Insulator-type lever 3a Roller 4 Supporting point 5 Slide plate 5a Inclined surface 6 Rail 7 Driving source 8 Elastic material S Shank T Cap tip

Claims (3)

  This is a handy cap tip removal device for removing the cap tip fitted to the tip of the shank of a resistance welder or welding gun, and a horizontal fixed claw that comes in close contact with the lower end of the shank on the front side of the case with a handle And a movable claw that is paired with the fixed claw and is in close contact with the upper end of the cap chip and rotates with the base of the fixed claw as a fulcrum. A handy type characterized by a lever-type lever that swings around the center, a wedge-type slide plate that rotates the lever to push down the movable claw, and a drive source that moves the slide plate back and forth Cap chip removal device.   2. The handy cap chip detaching device according to claim 1, 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 handy cap chip detaching device according to claim 1 or 2, wherein a rear portion of the lever lever is urged by an elastic material so as to be always in close contact with the inclined surface.

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