JPH0341906Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) The present invention relates to a non-circular position indexing device, which uses a non-rotating non-circular cam groove such as an oval or an oval shape provided around an intermittent rotating body. Therefore, the index plate provided on the table is interlocked to index the position of the index plate that follows the non-circular cam groove when the intermittent rotating body is stopped, and the spot welding machine This can be applied to the indexing of non-circular welding points.

(Prior art) A connecting piece protruding from an index plate that moves along a predetermined rotation trajectory on a table placed on the side of the rotating body is connected to an eccentric shaft of a rotating body that rotates intermittently at a constant angle. The intermittent rotation of the shaft in a circular trajectory around the axis of the rotary body is transmitted to the index plate, and the rotation body is stopped at a plurality of angles and the index plate is rotated at a plurality of positions. The device for determining the
Although it is disclosed in Japanese Patent No. 61-33482, even if an indexing plate is connected to the shaft of an intermittent rotating body at an eccentric position, it is impossible to index a non-circular position such as an elliptical shape or an egg shape. be.

(Problems to be solved by the invention) The device mentioned in the previous section and described in Japanese Patent Application Laid-Open No. 61-33482 is related to the application filed by the present applicant, but it cannot determine the position of non-circular objects. Therefore, it cannot be used for non-circular spot welding, for example. The present invention aims to make this possible.

(Means for Solving the Problems) The present invention has a structure that achieves the above-mentioned object. Specifically, the rotating body 2, which rotates intermittently at a constant angle, is surrounded by a non-circular shape such as an ellipse or an egg. A rotating non-circular cam groove 12 is provided, and the rotating body 2 is provided with the cam groove 12.
A fork-shaped arm 14 protruding across the cam groove 12 is attached to the table 24, which is provided with two or more guide grooves 25 similar to the cam groove 12, and an engaging pin 28 is fitted into each guide groove 25, respectively. A projecting board 26 is provided,
An arm 36 projects from the plate 26 onto the cam groove 12.
The non-circular cam groove 12 is inserted through the groove of the fork arm 14.
This relates to a non-circular position indexing device characterized by having a copying pin 37 fitted into the non-circular position indexing device.

A preferred embodiment of the present invention will be described in the next section.

(Example) Fig. 1 shows the main part of the present invention, and 2 is an intermittent rotating body rotatably supported by a fixed shaft 3 on a support base 1, and has many index marks on its outer periphery. A cam cylinder 4 provided with a guide groove 5 is fixed. Each indexing guide groove 5 has a spiral clockwise screw, and an open opening 6 at the lower end.
Each opening 6 is offset clockwise from the upper end of the indexing guide groove 5 so that the left part of the opening 6 adjacent to the right is below the upper end of the indexing guide groove 5 adjacent to the right. Each indexing guide groove 5 is twisted.

A rotation preventing portion 7 is formed in the lower part of the rotating body 2, and includes an engaging wall 8 corresponding to the rotating direction of the rotating body and an inclined sliding guide 9 continuing to the right in the same number as the guide grooves 5. A lever-shaped stopper 10 that lowers in the direction of the arrow against the elastic force of
It is provided so that it can be engaged with.

A cam plate 13 provided with a non-rotating, non-circular cam groove 12 provided around the shaft 2a is replaceably fixed to the rotating body 2 on a base 11 which is fitted onto the upper shaft 2a to prevent rotation. A forked arm 14 crossing the cam groove 12 is fitted and fixed to the upper end of the shaft 2a. The cam groove 12 is formed into a non-circular annular groove such as an ellipse or an oval shape, and the drawing shows an oval groove. A groove 15 is provided in the fork arm 14 .

Each sliding guide groove 5 is provided with an indexing pin 18 attached to a lever 17 supported by a shaft 16 of an actuating body 19 that reciprocates up and down, so that the shaft 16 can move up and down as shown by solid lines and chain lines in FIG. This moves the pin 18 from the opening 6 to the upper end of each sliding guide 5, thereby causing the rotating body 2 to rotate intermittently in the clockwise direction. When going up, it remains horizontal, but when going down, the index pin 18 flips up and escapes from the opening 6 as shown in the figure, and at the extreme point of descent, it returns to the horizontal position and moves the index pin 18 to the right-hand side. It corresponds to the lower part of the opening 6.

The above-mentioned indexing pin 18 is used to index the intermittent stopping angle of the rotating body 2 by moving to the upper end of each sliding guide groove 5.

Reference numeral 21 denotes a spot welding machine having a jig for welding a retainer ring d to the lower outer periphery of an insertion hole c provided at the bottom of a lower member b of an automobile fuel tank a before welding. The retainer ring d is formed into an oval shape and is attached to the lower member b by spot welding at positions .about. in FIG. 5.

The welding machine 21 is provided with an upper electrode 22 and a lower electrode 23, and a table 24 from which the lower electrode 23 projects from below is provided with two oval guide grooves 25 having the same shape as the cam groove 12, or an oval guide groove 25 is provided at two locations. 25 and attach the caster legs 27 to the table 2.
Engagement pins 28 that fit into each of the guide grooves 25 are protruded from the index plate 26 that is in contact with the above-mentioned guide grooves 25. A support column 29 is projected above the index plate 26, and the support column 29
A welding jig 31 is fixed by a shaft 30 passed through the
A spring 32 supported by the index plate 26 is applied to the lower surface of the free end of the jig 31, and the welding jig 31 is slightly raised until it is pressed by the upper electrode 22. A window hole 33 is provided in the center of the welding jig 31,
An auxiliary electrode 34 made of a copper plate is attached to close the window hole 33. A positioning protrusion (not shown) into which the retainer ring d is temporarily fitted is provided around the positioning pin 35 by inserting the insertion hole c of the lower member b into the center of the auxiliary electrode 34 . The lower member b to be supplied onto the welding jig 31 rides on the retainer ring d, and fits into the insertion hole c into the positioning pin 35 of the auxiliary electrode 34.

An arm 36 protrudes from the index plate 26 in which the engagement pin 28 is fitted into the rotation guide groove 25, and is overlapped with the forked arm 14, and the profiling pin 37 at the tip is passed through the groove 15 of the forked arm 14 and inserted into the cam groove. Insert into 12.

The actuating body 19 is connected to the upper electrode 22 or an interlocking arm 38 that moves up and down in conjunction with the upper electrode.

In the above, the actuator 19 is interlocked with the upper electrode 22, which is an elevating actuator, and the upper electrode 22 is lowered as shown by the chain line in FIG. The lower member b is
When the retainer ring d is sandwiched between the spring 32 and the retainer ring d, the spring 32 is compressed and spot welding is performed by applying electricity. At this time, the shaft 16 of the actuating body 19 is lowered as shown by the chain line, and the indexing pin 18 is stopped directly below the opening 6 of the indexing guide groove 5 on the right side that determines the next indexing position, and the rotating body 2 and The position of the indexing plate 26, which is connected to the shaft 2a which is operatively integrated and which moves the engagement pin 28 within the guide groove 25, is set as the example shown in FIG. 5 to determine the spot welding positions of the lower member b, etc. put out.

Thus, when the upper electrode 22 and the operating body 19 rise, the indexing pin 18 enters through the opening 6 of the next angle indexing guide groove 5 and rises, reaching the upper end of the guide groove 5, so that the rotating body 2 It rotates according to the twist of the guide groove 5 and performs the next angle indexing. As a result, the fork arm 14 rotates, moving the copying pin 37 within the non-circular cam groove 12 and moving the index plate 26 along with it.
The welding jig 31, auxiliary electrode 34, etc. are moved, and the next spot welding position, for example, is determined.

By the above-described reciprocating movement of the actuating body 19, the welding positions in the annular arrangement illustrated in FIG. 5 are determined.

(Operation and Effect) The present invention has the structure clarified above,
The forked arm 14 is rotated in conjunction with the rotating body 2 that rotates intermittently at a constant angle and stops, and the non-circular cam groove 12
A copying pin 37 of an arm 36 provided on an indexing plate 26 that allows engagement pins 28 to be inserted into each guide groove 25 and moved on a table 24 provided with two or more similar guide grooves 25. is freely passed through the groove of the forked arm 14 and fitted into the cam groove 12, and the movement of the copying plate 26 on the table 24 can be controlled to be separated according to the non-circular cam groove 12,
It is possible to accurately index the position by moving the index plate 26 on the table 24, whose movement direction is originally restricted to a non-circular shape by the guide groove 25, as well as the intermittent stop of the rotating body 2 that rotates intermittently. It has the effect that it can.

[Brief explanation of drawings]

The attached drawings show one embodiment of the present invention.
1 is a partially cutaway side view, FIG. 2 is a partially cutaway plan view, and FIG. 3 is an enlarged plan view of the non-circular cam groove 12.
Figure 4 is a partially cutaway side view of the same part, Figure 5 is the welding position~
It is a line diagram which illustrated indexing of. 2 → Rotating body, 12 → Non-circular cam groove, 14 → Forked arm, 15 → Groove, 26 → Index plate, 36 → Arm, 37 → Copying pin.

Claims (1)

[Scope of utility model registration request] Around a rotating body 2 that rotates intermittently at a constant angle,
Non-rotating, non-circular cam groove 12 such as an oval or egg shape
A forked arm 14 is attached to the rotating body 2 and protrudes across the cam groove 12, and each guide is mounted on a table 24 provided with two or more guide grooves 25 similar to the cam groove 12. An index plate 26 into which an engaging pin 28 is fitted is provided in each groove 25, and an arm 36 protruding from the plate 26 onto the cam groove 12 is attached to a forked arm 1.
A non-circular position indexing device characterized in that a copying pin 37 is provided which is passed through a groove of No. 4 and fitted into a non-circular cam groove 12.