1. Field of the Invention:
The present invention relates to an improvement of the welding gun.
2. Prior Art:
The, inventor of the present invention made an earlier welding gun which was patented U.S. Pat No. 4,879,447 as illustrated in FIG. 5.
The prior art welding gun comprises an arm 21 provided with an electrode, a movable arm 22 provided with an electrode, a link 23 pivotally connecting the arm 21 and the movable arm 22 at the middle portions thereof by pins 25, 26 and a cylinder 24 integrated with the arm 21 and provided with a rod 27 having a tip end connected to the movable arm, 22 at its rear end.
There is a problem in the prior art welding gun in that the electrodes do not satisfactorily confront each other when they are worn a work piece held by the electrodes is deformed due to inadequate equalizing whereby the pressing force is not satisfactorily applied to the work piece to result in deteriorated welding quality. For applying a satisfactory pressing force to the workpiece, both the electrodes are adjusted to be positioned correctly, which is however troublesome.