| 摘要 |
The invention relates to a pneumatic drive system, having at least one pneumatic drive (2) which has a drive housing (4) and a drive output unit (6 ) which is moveable relative to said drive housing (4) under pressure loading. The drive output unit (6) comprises a drive output piston (8) which, in the drive housing (4), separates two working chambers (12, 13) from one another, one or both of which chambers (12, 13) are connected to a pneumatic control line (17, 18), in the course of which are connected control valve means (22, 23) which are switchable between an air-saving position and an open position (24) which releases a larger flow cross section than said air-saving positio n, which control valve means (22, 23) are assigned actuating means (32) which c an be activated as a function of the position of the drive output unit (6) and which can bring about a switch of the control valve means (22, 23) into the air-saving position when the drive output unit (6), on account of the compressed air flowing through said control valve means (22, 23) into the pneumatic drive (2), has reached a stroke end position or a position situate d a short distance before said stoke end position. The air-saving position has the peculiarity that it is a throttle position (25) which releases a smaller flow cross section than the open position (24).
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