| 摘要 |
PROBLEM TO BE SOLVED: To control the stroke length of a tool in a pneumatic drive tool. SOLUTION: This pneumatic drive tool includes: first and second pistons 18, 20 energized to approach each other by first and second energizing means 24, 26 in a housing 12. Subsequently, the compressed air is supplied between the pistons, and the pistons 18, 20 are respectively driven backward and forward. Further, the tool includes exhaust ports 20b-1 to 20b-4 for discharging the compressed air to the outside, thereby returning the pistons forward and backward by the respective energizing means. The exhaust ports 20b-1 to 20b-4 are opened to discharge the compressed air to the outside at a point of time the first and second pistons 18, 20 are driven forward and backward by a predetermined distance. In this case, the exhaust ports 20b-1 to 20b-4 are varied in set positions in the axial direction. COPYRIGHT: (C)2007,JPO&INPIT
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