JP2006000859A - Cap tip removing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cap tip removing device capable of easily, reliably and consistently removing a cap tip fitted to a shank tip part of a resistance welding machine and a welding gun, and preventing a shank from being damaged. <P>SOLUTION: The cap tip removing device for removing a cap tip fitted to a shank tip part of a resistance welding machine and a welding gun comprises a longitudinally movable slide truck 2, a lever 5 connected to the slide truck 2 and having a claw part 6 on a tip part, and a guide plate 7 for positioning the shank. The slide truck 2 has a cam groove 9 to turn the lever 5 so as to depress the claw part 6 by the advancing motion of the slide truck 2 after the claw part 6 is advanced between the shank S and a cap tip T. <P>COPYRIGHT: (C)2006,JPO&NCIPI

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 tip detaching device of the present invention made to solve the above-mentioned problems is a cap tip detaching device for removing a cap tip fitted to a tip of a shank of a resistance welder or a welding gun, and is movable back and forth. A sliding carriage, a lever lever connected to the sliding carriage and having a claw at the tip, and a guide plate for positioning the shank. The sliding carriage has a claw that includes a shank and a cap chip. A cam groove for rotating the lever is further provided so as to push down the claw portion by the forward movement of the slide carriage after the forward movement.

  In the present invention, after the electrode is moved forward by a robot between the shank and the cap chip or the entire apparatus is moved forward, the lever of the lever is rotated by the forward movement of the slide carriage. The movable claw is pushed down so that 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 an overall perspective view showing a 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, 1 is a base board, and 2 is a slide carriage that can be moved back and forth. The slide carriage 2 is connected to a drive unit 3 such as an air cylinder by an L-shaped bracket 3 a and moves back and forth along the rail 4. Reference numeral 5 denotes a lever lever which is connected to the slide carriage 2 and has a claw portion 6 at the tip, 7 is a guide plate for positioning a shank attached to the base board 1 through an angle 8, and 7a is provided on the guide plate 7 It is the insertion hole of the made shank.

  Further, the slide carriage 2 has a claw portion 6 advanced between the shank S and the cap chip T, or after the shank S and the cap chip T are advanced, the slide carriage 2 further moves forward to move the claw portion 6. A cam groove 9 is provided for rotating the lever 5 so as to push down. That is, the lever 5 is provided with a cam floor 5a projecting at the rear portion and engaged with the cam groove 9, and the front portion is pivotally supported by a fixed claw unit 10 described later with a pivoting portion 11, and the cam floor 5a is The claw portion 6 at the tip is pushed down by being guided by the cam groove 9.

  As shown in FIG. 4, the claw portion 6 includes a fixed claw 6 a that abuts against the shank S and maintains a horizontal state, and a movable claw 6 b that abuts against the cap chip T and rotates as the lever 5 rotates. It is supposed to consist of Further, the claw portion 6 is formed with a notch groove 6c for introducing a shank.

  The slide carriage 2 has a fixed claw unit 10 attached to the tip of a rod 13 that is elastically supported by a resilient member 12 such as a spring so as to always protrude. The fixed claw unit 10 has a fixed claw 6a. Is provided (see FIG. 5). On the other hand, a lever-type lever 5 is pivotally attached to the fixed claw unit 10 with a pivoting portion 11, and the front end of the lever 5 is a fixed claw 6a.

  The fixed claw unit 10 is provided with a stopper piece 14 that contacts the guide plate 7 and stops further movement of the fixed claw unit 10. With this stopper mechanism, the shank S can be always set at the correct position by the insertion hole 7a of the guide plate 7 and the notch groove 6c of the claw portion 6.

  Further, a sensor for confirming whether or not the shank S has been normally inserted into the insertion hole 7a of the guide plate 7 and whether or not the cap chip T has been completely removed in the fixed claw unit 10 or in the vicinity thereof. 15 is attached (see FIG. 5). As a result, reliable and stable cap chip removal can be performed.

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. 5, the shank S is inserted into the insertion hole 7 a of the guide plate 7. At this time, the fixed claw 6a and the movable claw 6b are in an overlapping state, the upper surface of the fixed claw 6a contacts the shank S, and the lower surface of the movable claw 6b contacts the cap chip T. Moreover, since the fixed claw 6a and the movable claw 6b have flat surfaces, the shank S can be reliably guided.

  Next, the drive unit 3 is activated and the slide carriage 2 moves forward along the rail 4. As a result, when the fixed claw unit 10 moves forward, the lever 5 is also moved forward by being pulled by the pivot portion 11. By the forward movement of the lever 5, the claw portion 6 at the tip of the lever 5 enters between the shank S and the cap chip T.

Next, as shown in FIG. 6, the stopper piece 14 abuts against the guide plate 7 to stop the forward movement of the fixed claw unit 10 beyond that. At this time, the shank S is always set at the correct position by the insertion hole 7a of the guide plate 7 and the notch groove 6c of the claw portion 6.
Thereafter, when the slide carriage 2 is further moved forward, as shown in FIG. 7, the cam floor 5a of the lever 5 is guided by the cam groove 9 and gradually rises, and the lever 5 rotates around the pivoting portion 11. It will move, and the nail | claw part 6 of a front-end | tip will be pushed down. 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 6a is in contact with the shank S, there is no possibility that the shank S will be damaged.
After removing the cap chip in this way, the slide carriage 2 is returned to the initial position, and thereafter the same operation is repeated.

In particular, in the present invention, as shown in FIG. 4, the claw portion 6 is movable so that it comes into contact with the shank S and keeps the horizontal state, and the claw portion 6 a contacts the cap chip T and rotates as the lever 5 rotates. Since the structure is such that the shank S is held by the horizontal fixed claw 6a and the pressing force of the movable claw 6b acts only on the cap chip T, the shank S is not damaged at all. . Further, a sensor for confirming whether or not the shank S has been normally inserted into the insertion hole 7a of the guide plate 7 and whether or not the cap chip T has been completely removed is present at or near the fixed claw unit 10. Since 15 is attached, the cap chip can be reliably and stably removed, and a mistake signal from the sensor 15 can be reliably handled.
Although the above description has been given for the case where one device of the present invention is used, as shown in FIG. 8, 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 chip removal device of the present invention is a cap chip removal device that removes a cap chip fitted to the tip of a shank of a resistance welder or a welding gun, and is movable back and forth. The slide carriage 2 has a lever lever 5 connected to the slide carriage 2 and having a claw 6 at the tip, and a guide plate 7 for shank positioning. The slide carriage 2 has a claw 6 Since the cam groove 9 for rotating the lever 5 so as to push down the claw portion 6 by the forward movement of the slide carriage 2 after the forward movement between the shank S and the cap chip T is provided, The fitted cap chip T can be removed easily, reliably and stably, and the shank is not 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.

1 is an overall perspective view showing an embodiment of the present 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 which shows operation | movement of the apparatus which concerns on this invention. It is explanatory drawing which shows operation | movement of the apparatus which concerns on this invention. It is explanatory drawing which shows operation | movement of the apparatus which concerns on this invention. It is a front view which shows other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base board 2 Slide trolley 3 Drive part 4 Rail 5 Lever lever 5a Cam floor 6 Claw part 6a Fixed claw 6b Movable claw 6c Notch groove 7 Guide plate 7a Insertion hole 8 Angle 9 Cam groove 10 Fixed claw unit 11 Pivoting part 12 Elastic member 13 Rod 14 Stopper piece 15 Sensor S Shank T Cap tip

Claims (6)

  A cap tip removal device for removing a cap tip fitted to the tip of a shank of a resistance welder or a welding gun, which is a slide cart that can be moved back and forth, and a claw portion that is connected to the slide cart and has a claw at the tip. It has a lever of lever type and a guide plate for positioning the shank. After the claw is advanced between the shank and the cap chip, the slide carriage further pushes down the claw by the forward movement of the slide carriage. A cap chip detaching device characterized in that a cam groove for rotating the lever is provided.   2. The cap chip removing device according to claim 1, wherein the claw portion includes a fixed claw that abuts against the shank and maintains a horizontal state, and a movable claw that abuts against the cap chip and rotates as the lever rotates.   The cap according to claim 1 or 2, wherein a fixed claw unit is attached to a tip of a rod that is elastically supported so as to protrude at all times, and the fixed claw unit is provided with a fixed claw. Chip removal device.   The cap-tip detaching device according to any one of claims 1 to 3, wherein the lever of the lever type is pivotally attached to the fixed claw unit, and the front end portion is a fixed claw.   The cap chip removal device according to any one of claims 1 to 4, wherein the fixed claw unit is provided with a stopper piece that stops the forward movement of the fixed claw unit beyond the guide plate. 6. A sensor for confirming whether or not the shank has been normally inserted into the guide plate and whether or not the cap chip has been removed is attached to the fixed claw unit or the vicinity thereof. Cap chip removal device according to claim 1.

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