| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a driving machine which improves durability of a bumper by eliminating a problem of breakage due to stress concentration caused at the groove of the inner circumferential face of the bumper. Ž<P>SOLUTION: The driving machine is provided with a pressure accumulation chamber for storing compressed air, a cylinder communicable with the pressure accumulation chamber, a piston reciprocable in the cylinder, a plate-like driver blade connected with the piston, and the bumper having a cylindrical shape and having a first groove through which the driver blade passes at the inner circumferential face. A second groove is arranged at the inner circumferential face of the bumper. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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