JPH0239654Y2 - - Google Patents

Description

[Detailed description of the invention] For example, when the welding head of a welding machine is supported by a two-axis differential mechanism and the inclination angle position of the welding head is adjusted, the welding head that is applied to the two differential axes is The present invention relates to a device for balancing loads.

The welding head of a conventional welding machine is as shown in FIG. 1, in which numeral 1 is a case and a holder 2 is fixed inside. This holder 2 is composed of two cylindrical support parts 2a and 2b whose tips protrude outward from the case 1, and a part 2c that connects these parts into one body.
3a and 3b are the supporting parts 2 of the holder 2, respectively.
Two differential shafts are supported slidably in the axial direction in a and 2b, and two brackets 5a and 5b and pins 6a and 6 are fixed at one end to the welding head 4.
b, and nuts 7a and 7b are fixed to the other end. 8a and 8b are two screw shafts, one end of which is screwed into the nuts 7a and 7b, and two sprockets 1 formed in the center with different tooth ratios and connected to each other by a chain 9.
0a and 10b are fixed, and the other end is attached to the bracket 11.
It is fixed at both ends in the axial direction and freely supported in the rotational direction. The other end of one screw shaft 8a passes through the bracket 11 and is connected to a motor 14 held by a motor bracket 13 via a coupling 12. The center portion of the bracket 11 is screwed into one end threaded portion of a shaft 15 rotatably supported by the case 1, and the motor bracket movably inserted into the hole 1a of the frame 1 is attached to one end. Holds 13.
The other end of the shaft 15 is connected to a motor 17 via a coupling 16. This motor 17 is
It is held by a bracket 18 fixed to the frame 1.

With the above configuration, when the motor 17 is driven, the shaft 15 rotates and the bracket 11 moves horizontally, so the two screw shafts 8a, 8b and the two differential shafts 3a, 3b simultaneously move in the axial direction. Move the welding head 4.

Also, when the motor 14 is driven, one screw shaft 8
a rotates to move one differential shaft 3a in the axial direction, and at the same time, as the one screw shaft 8a rotates, the other screw shaft 8b is moved from one sprocket 10a through the chain 9 and the other sprocket 10b. One screw shaft 8a rotates at a different speed (slower speed) to move the other differential shaft 3b in the axial direction.

Now, while the tip of one differential shaft 3b is moving from position N to position H, the tip of the other differential shaft 3a is moving from position A to position C, and the welding head 4 is moved to the above position. Center the position and swing from the solid line position to the chain line position. Therefore, one pin 6 drilled in one bracket 5a of the welding head 4
a The center position of the insertion hole is as shown in h,
A deviation occurs by a distance X between the position C and the position C of one pin 6a. Therefore, in reality, the one pin 6a insertion hole of the one bracket 5a is inserted at the distance X.
It is formed into an elongated hole that is long in the vertical direction so that only one pin 6a can move.

However, by forming the hole for inserting one of the pins 6a into an elongated hole that is long in the vertical direction, the load of the welding head 4 is not applied to the tip of one differential shaft 3a through the one pin 6a, and the difference between the two pins 6a is A load is applied only to the moving shaft 3b. Therefore, the other differential shaft 3b
It is necessary to make the differential shaft 3a larger than the one differential shaft 3a, which has the disadvantage that the overall shape becomes larger.

The object of the present invention is to provide a device which eliminates the above-mentioned drawbacks, equalizes the load of the welding head on the two differential shafts, and allows the overall shape to be made smaller.

The structure of the present invention is such that a spring is inserted between the tip of one of the differential shafts and a support such as a welding head, and the load of the support is transferred to the other differential shaft through this spring. It was designed to be added.

An explanation will be given below with reference to FIG. 2 showing an embodiment of the present invention. As shown in the figure, in the present invention, a horizontal washer 19 is fixed to the upper end of one of the brackets 5a fixed to the upper end of the welding head 4.
A spring 20 is inserted between the upper surface of the tip end of one differential shaft 3a, and other than the above, the configuration is the same as that of the conventional FIG. 1.

With the above configuration, half of the load on the welding head 4 is transferred to one differential shaft 3a via the spring 20.
join.

Therefore, the load on the welding head 4 is
a, 3b, the other differential shaft 3b can be formed to have the same size as one differential shaft 3a,
This has the effect of making the overall shape smaller.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional two-axis differential mechanism, and FIG. 2 is a front view of a two-axis differential mechanism in which the present invention is implemented. 3a, 3b... Differential shaft, 4... Welding head, 5
a, 5b...bracket, 6a, 6b...pin,
19...Washer, 20...Spring.

Claims (1)

[Scope of utility model registration request] Two differential shafts are provided that are spaced apart from each other and have their tips connected to a support body, and the two differential shafts are moved at different speeds with respect to the tip support portion of one of the differential shafts. In a two-axis differential mechanism that adjusts the tilt angle position of the support by swinging the support,
Connect the tip of the other differential shaft and the support body to the pin,
The pin is connected through an elongated hole into which the pin is movably fitted, and a spring is inserted between the tip and the support so that the load of the support is applied to both differential shafts. A balance device for a two-axis differential mechanism.