Hydraulic drive system for platen

Details Hydraulic drive system for platen Hydraulic drive system for platen

1986-09-16

1988-06-21

Look, Edward K.

Power plants

Pressure fluid source and motor

Servo-motor having externally operated control valve sets...

60415, 60418, 60484, 60487, 60488, 60493, F16D 3102

Patent

active

047518189

ABSTRACT:
A hydraulic drive system for driving a platen in forward and return reciprocatory strokes includes a hydraulically driven reciprocable piston and a reversible rotary hydraulic motor having a crank coupled to the platen by a link. A hydraulic circuit employs a variable output pump connected via a reversible direction control valve to drive the piston and crank in unison to cooperatively drive the platen. The piston and crank motor are connected in parallel to the pump and the pump output is advantageously distributed variably between the piston and motor during the stroke cycle. Where the stroke of the platen is vertical, the system may include a hydraulic counterbalance circuit to counterbalance the weight of the platen. The pump output may be varied to control the velocity of the platen at selected points in its stroke.

REFERENCES:
patent: 3921503 (1975-11-01), Kubik
patent: 4043125 (1977-08-01), Kubik
patent: 4220004 (1980-09-01), Abeille et al.
patent: 4431064 (1984-02-01), Bright

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