Presses – Automatic or material triggered control – Of actuating means
Patent
1975-03-24
1977-03-15
Wilhite, Billy J.
Presses
Automatic or material triggered control
Of actuating means
100 53, 100257, 100259, B30B 1528, B30B 1514
Patent
active
040118096
ABSTRACT:
A press having mechanical drive elements acting on the ram through at least one pressure cushion serving as a hydraulic overload safety device, at least one cylinder-piston unit operating under the effect of a compressed fluid for counterbalancing the weight of the ram associated with an upper die of the press, and a control system for adjusting fluid pressure in the cylinder-piston unit to a value for counterbalancing the weight. The control system includes a pressure relief valve and a pressure meter associated with the pressure cushion wherein the meter detects the pressure in the pressure cushion in a measuring range including a predetermined value. An actuating member serves for initiating a counterbalancing operation which includes operation of the pressure relief valve and control of supply and discharge valves for supplying and discharging fluid to and/or from the cylinder-piston unit.
REFERENCES:
patent: 2748665 (1957-03-01), Georgeff
patent: 3115086 (1963-12-01), Stimmel
Buchler Wolfram
Kellenbenz Rolf
Schneider Franz
Schumann Burkhard
Waller Eugen
L. Schuler GmbH
Wilhite Billy J.
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