Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Feed control of material en route to shaping area
Patent
1985-12-30
1987-12-15
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Feed control of material en route to shaping area
264 403, 264 405, 264 407, 425146, 425149, 425161, B29C 4582
Patent
active
047129913
ABSTRACT:
A hydraulic control system for the operation of three linear and one rotary hydraulic drive assemblies of the injection unit of an injection molding machine, comprising a variable delivery pump supplying drive fluid at a constant pressure gradient to several supply lines controlled by two control units which are arranged in parallel and feature proportional P/Q valves and pressure transducers, a smaller pressure maintenance pump which is controllable by a third proportional P/Q valve and switchable into one of the supply lines, and a hydraulic accumulator for the temporary supply of a large quantity of drive fluid. The proportional P/Q valves convert automatically from their flow rate programs, controlled by displacement-to-voltage converters on the injection unit, to pressure programs controlled by the pressure transducers.
REFERENCES:
patent: 4318874 (1982-03-01), Lemelson
Hydraulics, Theory and Applications, from Bosch., 1984, Robert Bosch, pp. 288-304.
Geiger Joseph A.
Heitbrink Timothy W.
Woo Jay H.
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