Press cushion for a mechanical press
AssigneeFa. Theodor Grabener Pressensysteme GmbH & Co. KG
InventorTheodor Klein
Life of this patent
Estimating the term…
Abstract
The mechanical press, particularly a toggle press, comprises a hydraulic member connected between the force transmitting and force receiving components, such as a toggle joint, carriage, anvil, and platen. The anvil is mounted on a hydraulic member which is located in a hydraulic chamber. The hydraulic member acts as a press cushion which is continuously connected with a large volume fluid reservoir which is maintained constantly under a gas pressure. The hydraulic member has a maximum filling volume which is at most 1% of the volume of the fluid reservoir.
Claims10
In a mechanical press having a platen comprising a force transmitting component including a toggle joint and an anvil comprising a force receiving component wherein the anvil is mounted on a hydraulic member in a hydraulic chamber and wherein the hydraulic chamber acts as a press cushion for said anvil and which is continuously connected with a fluid reservoir which is maintained under a gas pressure, the improvement wherein said hydraulic member has a maximum filling volume which is at most 1% of the volume of said fluid reservoir and said gas pressure in said fluid reservoir is maintained continuously at a valve enabling development of a pressing force between the anvil and platen.
A mechanical press comprising:
- a platen comprising a force transmitting component including a toggle joint and an anvil comprising a force receiving component wherein the anvil is mounted on a hydraulic member in a hydraulic chamber acting as a press cushion for said anvil;
- a fluid reservoir which is continuously connected to said hydraulic member and which is maintained under a gas pressure, said hydraulic member having a maximum filling volume which is at most 1% of the volume of said fluid reservoir;
- a gas accumulator compartment in said fluid reservoir in which said gas pressure is maintained continuously at a value enabling development of a pressing force between the anvil and platen;
- a gas pump connected to said gas accumulator compartment for changing said gas pressure;
- a gear pump and a piston pump for feeding hydraulic fluid to said fluid reservoir, said gear pump being set up for providing changes in a set value of fluid pressure and said piston pump being set up for feeding said hydraulic fluid to maintain said set value of fluid pressure, a gas conduit communicating with said gas pump being selectively connectable either with a high pressure gas tank or said gas accumulator compartment of said fluid reservoir;
- a plurality of pressure sensors for said fluid pressure and said gas pressure;
- and
- a computer which is connected to and receives the measurements of said pressure sensors and controls a means which regulates said gas pressure so that said fluid pressure and correspondingly said pressing force can be maintained under a variety of operating conditions.
In a mechanical press having a platen comprising a force transmitting component including a toggle joint and an anvil comprising a force receiving component wherein the anvil is mounted on a hydraulic member in a hydraulic chamber and wherein the hydraulic chamber acts as a press cushion for said anvil which is continuously connected with a fluid reservoir which is maintained under a gas pressure, the improvement wherein said hydraulic member has a maximum filling volume which is at most 1% of the volume of said fluid reservoir and said gas pressure in said fluid reservoir is maintained continuously at a value enabling development of a pressing force between the anvil and platen, and wherein an operating pressure of said hydraulic member is changeable by a means comprising said gas pressure in said fluid reservoir, and said operating pressure on said hydraulic member generates a pressure value signal which is fed into a computer which compares said pressure value with a calculated desired gas pressure value and when said gas pressure value must be changed, the computer operates a means which changes a volume of said gas pressure.
Dependencies are inferred from the claim text.