Press-driven tool module in particular press-driven cross-punching or bending unit

Abstract

A press-driven tool module comprising a foundation body including a cylindrical bore; a work ram slidably mounted in the cylindrical bore of the foundation body for sliding movement in non-vertical reciprocal operating and return directions, the ram adapted for receiving a work tool, wherein the work ram is a piston rod of a hydraulic medium activated work piston, and wherein the work piston is slidably mounted in a work space of a work cylinder; a return spring element disposed for urging the ram in the return direction; a hydraulic power cylinder having a displacement space containing hydraulic medium; a vertically displaceable plunger mounted in the hydraulic power cylinder for acting upon the hydraulic medium; and a press ram disposed for acting upon the plunger; a hydraulic pressure line communicating between the displacement space of the power cylinder and the work space of the work cylinder, wherein a supply space is provided in the power cylinder for the hydraulic medium, which supply space, when the plunger is at the upper top dead center, is in communication with the displacement space of the power cylinder, and which supply space is otherwise sealed off from the displacement space by high pressure seal means.

Dependencies are inferred from the claim text.