JPS607907Y2 - spot welding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spot welding device, the purpose of which is to automatically shift the spot welding point by forward and backward movement of the spot welding gun.

When performing parallel spot dots on a workpiece, it is necessary to shift the spot welding gun by the required amount.

Conventionally, the movable table supporting the spot welding gun has been implemented using a shifting cylinder device, but in this case, equipment such as hydraulic piping and a control device is expensive and has the problem of causing failure.

In view of the conventional problems, the present invention utilizes the forward and backward movement of the spot welding gun, and uses a simple cam mechanism to swing the spot welding gun by the required shift amount.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a moving platform, which moves forward and backward on rails 2 laid on the floor using wheels 1a.

3 is a guide bar fixed between the rails 2 with an axis parallel to the rails 2, and a guiding member provided on the lower surface of the movable base 1 (7) is slidably fitted to guide the movable base 1. .

Reference numeral 4 denotes a reversible motor, which rotates along the rail 2 and operates an endless chain 5 connected to the moving platform 1.

A support base 6 is provided on the movable base 1 so as to be rotatable by a support shaft 7, and a spot welding gun 8 is installed on the support base 6.

Further, a shift cam plate 9 is placed on the movable table 1 with a guide member 11.
It is held slidably in the moving direction of the movable table 1 by the movable base 1.

As shown in FIG. 2, this shift cam plate 9 has a shift cam groove 10 having a groove end 10aiOb at a required shift amount.
is provided.

A cam floor 12 fixed to the support base 6 is engaged and guided in this shift cam groove 10.

On the other hand, a stopper 13a abutting against the shift cam plate 9 is provided on the floor immediately before the forward end and the backward end of the movable table 1.
, 13b are fixedly installed.

Although not shown, the rail 2 or the guide bar 3 is provided with a dog for operating the spot welding gun 8 at a predetermined spot welding position, and a limit switch sends a signal for spot welding operation. There is.

Next, the operation of the device of the present invention will be explained.

The outline of the operation is shown in Fig. 3. During the forward movement A of the moving table 1, the first spot Pa is placed on the workpiece W, and during the backward movement B, the second spot is placed at the position of the required shift amount. This is to perform pb.

This will be explained in detail with reference to Figures 1 and 2.
Figure 1 shows the state in which the movable table 1 has moved to just before the forward end.

At this point, the front stopper 13a comes into contact with the front surface of the shift cam plate 9, and the shift cam plate 9 and the movable base 1 move relative to each other until the movable base 1 reaches the forward end, and the shift cam plate 9 retreats.

As a result, the cam floor 12 is guided from the rear groove end 10a of the shift cam groove 10 to the front groove end 10b, and the support base 6 is rotated by the amount of the shift amount, causing the spot welding gun 8 to swing.

By moving the movable table 1 backward B from the forward end in this state, the second spot pb shown in FIG. 3 is performed while moving to just before the backward end.

When the moving table 1 moves to just before the rearward end, the rear stopper 13a comes into contact with the rear surface of the shift cam plate 9,
The shift cam plate 9 is moved forward.

As a result, the cam floor 12 is guided to the rear groove end 10a of the shift cam groove 10, and the spot welding gun 8 is swung in the opposite direction from the previous shift.

Then, by the forward movement A of the movable table 1, the first spot hitting point Pa shown in FIG. 3 is performed.

As mentioned above, the device of the present invention can be used in parallel spot welding.
The spot welding gun is oscillated by a predetermined shift amount using the shift cam mechanism using the forward and backward movement of the moving table, so compared to conventional equipment such as hydraulic cylinder equipment, its piping, and control equipment. It has the advantage that it can be provided at a very low cost and that it can operate reliably without failure.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the apparatus of the present invention, FIG. 2 is a perspective view of a shift cam plate, and FIG. 3 is a plan view of a workpiece showing the operation procedure of the spot dotting point according to the present invention. 1...Moving table, 2...Rail, 3...
...Guide bar, 4...Motor, 5...
...Endless chain, 6...Support stand, 7
...Spindle, tail ...Spot welding gun, 9
...Shift cam plate, 10...Shift cam groove, 11...Guide member, 12...
Cam floor, 13a5.13b...stopper.

Claims (1)

[Scope of utility model registration request] A movable base that moves forward and backward by a drive device, a support base that supports a spot welding gun that is swingably installed on the movable base, and a shift cam that is slidably provided on the movable base in the direction of movement of the movable base. A shift cam plate having a groove, a cam floor that is fixed to the support base and engaged and guided by the shift cam groove, and a stopper that abuts the shift cam plate from immediately before the forward end and the backward end of the moving base. Equipped with spot welding equipment.