Multi-spot welding apparatus

Claim 1

A multi-spot welding apparatus comprising: a machine frame, said machine frame being formed with a front frame and a rear frame being detachably coupled together; a jig table on the front figure of said machine frame; a plurality of welding guns on said jig table and located along the contour shape of a workpiece to be worked, each of said guns being formed with stationary and movable arms; electric supply means located on said rear frame having a plurality of electric supply units connected to said welding guns through respective electric supply cables; pressure applying means located on said front frame having a plurality of operational cylinders each connected to said respective welding guns through respective flexible wires at said respective moveable arms and located on the rear side and upper side of said machine frame; clamping means actuatable by said operational cylinders after a workpiece is placed on said jig table on the front surface of said machine frame, said operation cylinders actuating said clamping means through said flexible wires, fixedly clamp said workpiece and make ready for a subsequent working operation, said welding guns being operated by said operation cylinders through said flexible wires so that said workpiece has applied thereto a substantially large number of spot-welds at a substantially large number of points on said workpiece, said electric supply guns being connected to said electric units through said supply cables so that an electrical current passes between opposing electrodes through said workpiece to produce a spot-weld, said clamping means being released after said spot-weld is produced for removing said workpiece therefrom.