Patent ID: 11919209
Assignee: NIENSTEDT GMBH
Field: Other special machines (Mechanical engineering)
Classification: CPC B  F  Y | IPC B  F

Claim 0:
1. An apparatus for machining or processing a workpiece that can be positioned in a workpiece holder, comprising:
at least one tool that is movable relative to the workpiece holder during the machining or processing of the workpiece, wherein the apparatus is a press device for the form-pressing of workpieces, and includes a component movable by the press device in a reciprocal stroke movement during the machining of the workpiece; and
at least one pressure line circuit having at least one pump unit and at least one energy storage, which is in flow connection with the pump unit via a pressure line, and a pressure outlet, at which a pressure difference present in the energy storage with respect to the ambient pressure can be tapped via a pressure supply line that runs from the energy storage to a pneumatic consumer;
wherein the pump unit has at least one mechanically driven pump element movable back and forth for sucking in or sucking out a medium and being in flow connection with the pressure line; and
wherein the pump element is directly or indirectly mechanically coupled to the apparatus in such a way that during the machining or processing of the workpiece the pump element is driven by movement of the tool;
wherein the pump unit is a compressor in the form of a piston/cylinder unit for building up a pneumatic overpressure arranged to suck in a gaseous medium and press it into the pressure line in a compressed state, wherein the energy storage is a pneumatic pressure storage with a pressure vessel with an internal pressure which is higher than the ambient pressure, wherein the pump unit is a piston/cylinder unit;
wherein a piston of the piston/cylinder unit is coupled to the stroke movement of the movable component of the press device, and the piston/cylinder unit has a working chamber arranged on one side of the piston;
wherein the working chamber is in flow connection with the pressure line having a pressure valve;
wherein the pressure valve in the case of a pump unit that is a compressor permits a flow from the piston/cylinder unit to the pneumatic energy storage, and is capable of blocking automatically in the opposite direction, or in the case of a pump unit that is a suction unit permits a flow from the pneumatic energy storage to the piston/cylinder unit and is capable of blocking automatically in the opposite direction;
wherein the press device comprises two separate pressure line circuits, each of the pressure line circuits comprising at least one energy storage and a pressure line; and
wherein one of the pressure line circuits is a pressure line circuit carrying over-pressure with a compressor as pumping unit, and one of the pressure line circuits is a pressure line circuit carrying under-pressure with a suction unit as pumping unit.