| 摘要 |
<p>A pneumatic screw punching machine includes a poppet portion (44) on a piston (28) of an air cylinder (23) and a piston catcher (43) disposed inside a head cap (24). The piston is held when the poppet portion fits into the piston catcher in a standby state. A retaining ring (40) in the head cap supports a head valve (39). A circumferential groove (41) is formed in an inner peripheral surface of the front part of the head cap and a ring-like seal (42) is fitted into the groove. When a driver bit (29) is to be changed, fitting bolts are removed and a housing (22) and the head cap are separated from each other. Then, the head cap, the head valve, the seal, the piston and the driver bit can all be removed together from the housing. <IMAGE></p> |
