| 摘要 |
PROBLEM TO BE SOLVED: To provide a driving machine having a rotation prevention mechanism not broken by impact caused by hitting of a plunger against a bumper.SOLUTION: A generally cylindrical holder thread part 65A whose outer surface is threaded is arranged at the end part in the axial direction of a bumper holder accommodating the bumper. An adjuster 66 is provided as a ring around the holder thread part 65A, and the inner peripheral surface of the adjuster 66 is threaded and screwed with the outer peripheral surface of the holder thread part 65A. The adjuster 66 cannot move in the axial direction. By rotation of the adjuster 66, the holder thread part 65A can move upward or downward integrally with the bumper 64. A part of the outer peripheral surface of the adjuster 66 is exposed to the outside of a housing 2 at a through-hole 2a. A plurality of grooves 66a extending in parallel in the axial direction of the adjuster 66 are formed on the outer peripheral surface of the adjuster 66, and a leaf spring projection 2B of a leaf spring 2A engages with the groove 66a. |
