| 摘要 |
A means serving to move a clamping device has a pressure medium cylinder whose drive piston (2), which can be uncoupled from the clamping device, can be driven directly via an inital setting stroke and with greater force via a working stroke by means of a mechanical transmission drive (6, 7, 8, 9, 11, 12). This transmission drive is designed to be self-locking and the end of the rod (5) of the drive piston (2) opposite the clamping device has a working memory (22) which, in combination with the self-locking design of the transmission drive, ensures that an initially clamped workpiece is still held in the event of malfunction of the pressure medium supply. As a safety measure, a monitoring device (27) that senses the stored energy of the working memory (22) is additionally provided, which is connected to a switching device (30) for the pressure medium source to admit pressure medium to a working space (3) of the cylinder (1) and/or to a switching device for actuating the tool to machine a clamped workpiece and/or to a display or warning device (31). <IMAGE>
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