Motors: expansible chamber type – Relatively movable working members with one having motive... – Synchronizing in response to sensed difference in positions
Patent
1979-07-10
1982-08-10
Maslousky, Paul E.
Motors: expansible chamber type
Relatively movable working members with one having motive...
Synchronizing in response to sensed difference in positions
91207, 91209, 91520, 92108, F01B 2504, F15B 1122
Patent
active
043432263
ABSTRACT:
In a press with two parallel, spaced apart multiple-acting cylinders that have their respective pistons connected to end portions of a beam to which a bending or forming tool is secured, the cylinders are respectively fed from effectively separate pressure fluid sources providing equal pressures and flow rates. For synchronization of piston extension through an initial rapid advance, the chamber of each cylinder that is normally pressurized for retraction of its piston is connected in feedback relation to the pressure fluid source for the other cylinder, so that fluid expelled from a leading cylinder augments the fluid supply to the lagging one. The system further comprises a pair of sensors, one for each beam end, and a synchronizing bleed-off valve for each sensor. During the working portion of the extension stroke each sensor responds to the relative position of its beam end to impress control signals upon its associated synchronizing valve whereby fluid being charged into the cylinder at its beam end is bled off at the rate necessary to maintain exact piston synchronization; and at the end of the extension stroke the sensors cause full opening of both synchronizing valves for accurate stopping of the beam.
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Firma Inter-Hydraulik GmbH
Maslousky Paul E.
Nilles James E.
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