JPH05307Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an automatic polishing device for electrodes of spot welding machines.

[Prior Art] The present inventor has already proposed an automatic polishing device 23 for electrodes of a spot welding machine, as shown in FIGS. 6 and 7. This device 23 has a sprocket wheel 2 attached to a drive shaft 1a of a low-speed rotating prime mover 1, and a base plate 24 extending horizontally.A top end 24a of the base plate 24 has polishing surfaces 5a for electrodes 14 and 15 on the front and back sides, respectively. , 5b is fitted into the center of the sprocket wheel 6, which is rotatably supported by a set plate 25 and a cover plate 26 via a bush. It's stuck. Further, a chain 12 is stretched between both sprocket wheels 2 and 6.

[Problem to be solved by the invention] In the automatic electrode polishing device 23, the sprocket wheel 6 into which the polishing piece 5 is fitted is supported so as to be surrounded by the set plate 25, the cover plate 26, etc. The structure is complicated and the cost is high, and since the set plate 25 that supports the sprocket wheel 6 is fixed with bolts 27, the slack in the chain 12 cannot be tightened, and the sprocket wheel 6 fitted with the abrasive piece 5 needs to be replaced. The problem was that it was not easy.

[Means for Solving the Problems] This invention, as shown in FIGS. 1 to 4, is capable of intervening between opposing electrodes 14 and 15 of a spot welding machine and along the end surfaces of both electrodes 14 and 15. In an electrode polishing device for a spot welding machine, the electrode polishing device for a spot welding machine is equipped with a polishing piece 5 having polishing surfaces 5a and 5b formed on the front and back surfaces, which are in contact with each other. The movable block 4 with a semi-circular engagement recess is connected to the prime mover 1.
A chain 12 is fixed to the distal end of a base plate 3 fixed to the proximal end thereof so as to be displaceable in the front and back direction, and a chain 12 is disposed between the driving sprocket wheel 2 provided on the prime mover 1 and the driven sprocket wheel 6.
tension lever 13 for tensioning and pushing forward the moving block 4 with the semicircular arc-shaped engagement recess.
is pivotally mounted 13b to the base plate 3, and is configured so that the driven sprocket wheel 6 is prevented from being engaged when the slide block 4 is in the forward position, and released when the slide block 4 is in the backward position.

[Embodiment] A first embodiment of this invention will be described based on FIGS. 1 to 4.

1 is a prime mover consisting of a geared motor, 1a is a drive shaft, and a drive sprocket wheel 2 is attached thereto. Reference numeral 3 denotes a base plate to which the upper surface of the motor 1 is fixed at its base end, and extends horizontally. Reference numeral 4 designates a moving block with a semi-circular engagement recess, which has a semi-circular recess 4a formed at its tip to rotatably support a driven sprocket wheel 6 into which a polishing piece 5 is fitted. Further, as shown in FIG. 4, the moving block 4 with a semicircular arc-shaped engagement recess is composed of two upper and lower plates 4b and 4c for ease of disassembly and assembly, and these are connected with bolts 7, and the lower plate 4b is connected to the base plate 3. A convex portion 9 is formed to engage with a groove 8 formed in the groove. Furthermore, the moving block 4 with a semicircular arc-shaped engagement recess is provided with a long hole 10 in the front-rear direction.
A lock bolt 11 screwed into the base plate 3 is inserted through the movable block 4 with a semi-circular engagement recess so that it can be displaced in the front-rear direction. A chain 12 is stretched between the driving sprocket wheel 2 and the driven sprocket wheel 6, and the driving sprocket wheel 2 has a pressing cam surface 13a that comes into contact with the rear end surface of the moving block 4 with a semicircular arc-shaped engagement recess. A tension lever 13 is pivotally mounted 13b on the base plate 3, and is configured to engage and inhibit the driven sprocket wheel 6 when the slide block 4 is in the forward position and released when the slide block 4 is in the backward position.

Here, the polishing piece 5 will be explained in detail.
Polished surfaces 5a and 5b are formed by forming surfaces that can intervene between the electrodes 14 and 15 and are in contact with each other along the end surfaces of the electrodes 14 and 15 on the front and back sides, respectively, and adhere fine abrasive material to these surfaces, respectively. .

[Function] When the end faces of the pair of electrodes 14 and 15 facing each other are applied to the front and back polishing surfaces 5a and 5b of the polishing piece 5, and the prime mover 1 is rotated, the rotation of the driving sprocket wheel 2 will be accompanied by rotation of the driving sprocket wheel 2. The driven sprocket wheel 6 is rotated by the chain 12, and at the same time the polishing piece 5 is rotated to polish the electrodes 14 and 15.

That is, during the polishing, the moving block 4 with the semi-circular engagement recess is pressed forward by the tension lever 13, and the chain 12 is held in tension by the lock bolt 11.

Next, when replacing the driven sprocket wheel 6 into which the polishing piece 5 is fitted, use the tension lever 13.
After moving the chain 12 to the loose position and loosening the lock bolt 11 and moving the semi-circular engagement recessed moving block 4 backward a little, the chain 12 is moved to the driven sprocket wheel 6.
Remove it from the wheel and replace it with a new driven sprocket wheel. After the chain 12 is hooked again, the tension lever 13 is turned to advance the moving block 4 with the semicircular arc-shaped engagement recess to the tension position, and the lock bolt 11 is tightened and fixed.

Figure 5 shows a second embodiment of this invention.
A moving block 17 with a semi-circular arc-shaped engagement recess is pivotally attached 18 to a horizontally extending base plate 16 attached to the upper surface of the prime mover 1, and the moving block 17 with a semi-circular arc-shaped engagement recess has a driven sprocket at its tip. A recess 17a is formed to rotatably support the wheel 6, and a lever 19 is provided at the rear end. Further, a lock bolt 21 screwed onto the base plate 16 is inserted and fastened into a long arc-shaped hole 20 formed in the moving block 17 with a semicircular-arc engagement recess, and a lock pin 22 is inserted therethrough. With these, the moving block 17 with a semicircular arc-shaped engagement recess is fixed to the base plate 16. Therefore, the moving block 17 with a semicircular arc-shaped engagement recess supports the driven sprocket wheel 6 at the solid line position, and supports the driven sprocket wheel 6 via the chain 12 as the driving sprocket wheel 2 rotates. It can be rotated.

Next, when replacing the driven sprocket wheel 6 into which the polishing piece 5 has been fitted, first loosen the lock bolt 21 and remove the lock pin 22, then hold the lever 19 and move the moving block 17 with the semi-circular engagement recess to the imaginary line position. After rotating the chain 12, remove it and replace it.

In other words, the moving block 1 with the semicircular arc-shaped engagement recess
7 and lever 19 are the moving block 4 with a semicircular arc-shaped engagement recess and the tension lever 13 of the first embodiment.
It has almost the same function as .

[Effects of the invention] According to this invention, the movable block 4 with a semi-circular engagement recess that rotatably supports the driven sprocket wheel 6 in which the polishing piece 5 is fitted is fixedly displaceable in the front-rear direction. Therefore, it is easy to replace the driven sprocket wheel 6 and to tighten the slack in the chain 12.
5. Although it is supported so as to be surrounded by the cover plate 26 and the like, it is supported by the moving block 4 with a semi-circular arc-shaped engagement recess formed with the semi-circular arc-shaped recess 4a, so that the structure is simple and the cost is low.

[Brief explanation of the drawing]

Fig. 1 is a front view of the overall structure showing the first embodiment of this invention, Fig. 2 is a plan view thereof, Fig. 3 is a - perspective view of Fig. 2, and Fig. 4 is a - perspective view of Fig. 2. It is. FIG. 5 is a plan view of the overall structure of a second embodiment of this invention. FIG. 6 is a front view of a conventional automatic electrode polishing device, and FIG. 7 is an enlarged view of the area around the polishing piece. 1... Prime mover, 1a... Drive shaft, 2... Drive sprocket wheel, 3... Base plate, 4
...Moving block with semicircular arc-shaped engagement recess, 4a...
... recess, 4b, 4c... plate, 5... polishing piece, 5
a, 5b... Polished surface, 6... Driven sprocket wheel, 7... Bolt, 8... Concave groove, 9... Convex portion, 10... Elongated hole, 11... Lock bolt, 12
...Chain, 13...Tension lever, 13
a...Cam surface, 13b... Pivot connection, 14, 15...
Electrode, 16... base plate, 17... moving block with semicircular arc-shaped engagement recess, 17a... recess,
18... Pivot, 19... Lever, 20... Long hole,
21... Lock bolt, 22... Lock pin, 2
3... Automatic polishing device for electrodes, 24... Base plate, 24a... Tip, 25... Set plate, 26... Cover plate, 27... Bolt.

Claims (1)

[Scope of utility model registration request] In an electrode polishing device for a spot welding machine, the polishing piece is provided with a polishing piece that can be inserted between opposing electrodes of the spot welding machine and has polishing surfaces formed on the front and back sides that are in contact with each other along the end surfaces of the electrodes. A moving block with a semicircular arc-shaped engagement recess that rotatably supports a driven sprocket wheel fitted in the center is fixed to the tip of a base plate fixed to the base end of the prime mover so as to be movable in the front-back direction. A chain is stretched between the driving sprocket wheel and the driven sprocket wheel provided on the prime mover, and a tension lever for pressing the moving block with the semicircular arc-shaped engagement recess forward is pivoted to the base plate. 1. An electrode polishing device for a spot welding machine, characterized in that the driven sprocket wheel is prevented from being engaged in the forward position of the slide block and released in the backward position.