WELDING GUN

摘要

A flange section (12b) protruding in the radial direction of a ball screw shaft (6a) is formed at the lower end of the ball screw shaft (6a), and a protrusion stopper (12a) which makes contact with the flange section (12b) to prevent the ball screw shaft (6a) from protruding out of a rod (7) is formed in a hollow section of the rod (7). A retraction stopper (13a) which makes contact with the lower end (13b) of the ball screw shaft (6a) to limit the retraction of the rod (7) is formed on the lower side of the hollow section of the rod (7).