Arrangement for driving the percussion body, especially for a hydrodynamic press

摘要

By means of a shut-off member (6), the connection from a compressed-gas container (1) to the interior of the guide bush (2) receiving the percussion body (3) is broken. So that the percussion body (3) can be accelerated efficiently by the compressed gas, throttle losses of the compressed gas must be avoided during travel when the shut-off member (6) is in the open position. This is achieved in that a driver (17) moved by the control piston (7) via the piston rod (8) is arranged displaceably in the shut-off member (6). When the driver (17) lifts off the shut-off member, which is in the closing position, from its seat, the latter rushes directly into the open position as a result of the pressure of the inflowing compressed gas. <IMAGE>