Patent ID: 8096162

Claim:
A hydraulic processing gripper for machining workpieces, comprising: a tool with an axially movable tool plunger moved by a first auxiliary drive from a plunger starting position to a plunger working position, in which the tool plunger bears against a workpiece, the first auxiliary drive comprising a hydraulic actuating device by means of which the tool plunger in the plunger working position is pressurized via a pressure transfer element with increased axial force, the pressure transfer element being movable between a pressure transfer element working position, in which it is located between a piston of the hydraulic actuating device and the tool plunger, and a pressure transfer element starting position, in which the pressure transfer element provides a space for the return movement of the tool plunger into the plunger starting position, wherein the piston has a hollow space, in which the tool plunger is held at least with a partial length in its plunger starting position, and that the pressure transfer element in its pressure transfer element starting position forms a bearing surface for the tool plunger on the piston of the hydraulic actuating device for closing the hollow space of the piston.