| 摘要 |
The invention provides a pressure application driving unit of a welding gun that is safe, low in manufacturing cost, and compact as a whole by employing a hollow rotary shaft (5) of the ordinary motor as it is and fixing a screw shaft fixing member (13) to an end face of the rotary shaft (5), thereby reciprocating a pressure application shaft (8) by the rotation of a screw shaft (17). The pressure application driving unit of a welding gun comprises a hollow through hole (6) formed in the rotary shaft (5) of a motor (1), the pressure application shaft (8) having a portion pulled in the hollow through hole (6) of the motor via the screw shaft (17) to be driven by the motor (1), a hole (9) for housing a tip end side of the screw shaft (17) formed on the center portion of the pressure application shaft (8) in the axial direction of the pressure application shaft (8), a nut (10) at the end side of the pressure application shaft and a screw (19) of the screw shaft (17) are threaded with each other, the pressure application shaft side (8) being nonrotatable, a space (22) formed in the hollow through hole (6) and capable of housing the nut (10) to be threaded with the screw shaft (17), wherein a screw shaft fixing member (13) is fixed to tap holes (7) formed on an end face of the rotary shaft (5) of the motor (1) and the screw shaft (17) is fixed in the screw shaft fixing member (13).
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