Robot-type welding apparatus

A robot-type welding apparatus comprising:

• a stationary main body;
• a supporting arm extending from and movable forwardly and rearwardly along the main body and having a front end portion;
• an elongated tiltable wrist base body pivotally supported proximate a front end portion thereof on said front end portion of said supporting arm;
• a shaft rotatably extending longitudinally through and supported by said wrist base body, said shaft having a front end;
• a wrist member fixed to said front end of said shaft having a front surface;
• an expansion arm member mounted on said wrist member substantially at right angles to said shaft, said expansion arm member being moveable along its longitudinal axis relative to said wrist member and having a forward end;
• a welding gun attached to said forward end of said expansion arm member;
• means for moving the supporting arm relative to the main body;
• means for tilting the wrist base body relative to the supporting arm;
• means for rotating the shaft relative to the wrist base body;
• and
• means for moving the expansion arm member relative to the wrist member;
• wherein the expansion arm member comprises a pair of right and left guide rods interconnected at both ends thereof through respective cross members, said guide rods being inserted through a pair of right and left bearing members provided on the front surface of the wrist member as to be supported slideably thereon, one of said guide rods having on one side surface thereof a rack, and said means for moving the expansion arm member comprises a bracket extending laterally from the wrist member having a front portion, a gear provided on said front portion in engagement with said rack, and an operation cylinder driving the gear and provided ahead of the gear.

A robot-type welding apparatus comprising;

• a stationary main body;
• a supporting arm extending from and movable forwardly and rearwardly along the main body and having a front end portion;
• an elongated tiltable wrist base body pivotally supported proximate a front end portion thereof on said front end portion of said supporting arm;
• a shaft rotatably extending longitudinally through and supported by said wrist base body, said shaft having a front end;
• a wrist member fixed to said front end of said shaft having a front surface;
• an expansion arm member mounted on said wrist member substantially at right angles to said shaft, said expansion arm member being moveable along its longitudinal axis relative to said wrist member and having a forward end;
• a welding gun attached to said forward end of said expansion arm member;
• means for moving the supporting arm relative to the main body;
• means for tilting the wrist base body relative to the supporting arm;
• means for rotating the shaft relative to the wrist base body;
• and
• means for moving the expansion arm member relative to the wrist member;
• wherein said expansion arm member is provided at its front end portion with an operation transformer for the welding gun, and said shaft is provided with a pair of longitudinally extending guide openings formed therein, an extended portion projecting from a rear end portion of the shaft, a pair of front and rear feeding rings arranged in sliding contact with feeding terminals on the laterally outside thereof fixedly provided on the periphery of the extended portion, and a pair of positive and negative feeding cables extending from the transformer passing through the pair of guide openings and extending rearwards for being connected to the pair of feeding rings by means of respective screws or the like.