| 摘要 |
A driving machine includes a cylinder, a piston fitted into the cylinder in a reciprocatingly movable manner, a driver connected to the piston, a bumper provided in the bottom portion of the cylinder, a housing, a return air chamber, a fastening member feed piston movable backward or forward by supplying compressed air within the return air chamber from an air chamber passage hole 9 through air passages and to a fastening member feed cylinder or discharging such compressed air from the fastening member feed cylinder, a return spring for energizing the fastening member feed piston, and a feed pawl mounted on the leading end of the fastening member feed piston. In the driving machine, between the return air chamber and the fastening member feed cylinder, a filter portion is provided having a projection shape and small holes.
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