Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Reexamination Certificate
2005-04-12
2005-04-12
Heitbrink, Jill L. (Department: 1732)
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
C264S328100, C425S135000, C425S161000, C425S166000, C425S589000, C425S591000
Reexamination Certificate
active
06878317
ABSTRACT:
The present invention provides a hydraulic actuating mechanism of an injection molding machine, in which a plurality of hydraulic actuators are driven by one hydraulic pump, wherein the hydraulic pump of the hydraulic actuating mechanism is a variable discharge pump having the maximum necessary delivery capacity at least for each of the hydraulic actuators at the time of the highest rotational speed of the pump; the discharged fluid pressure is controlled by a discharge cutoff function of a pressure compensator ancillary to the variable discharge pump; and the pump is driven by a motor whose rotation can be controlled in a stepless mode.
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Heitbrink Jill L.
Mitsubishi Heavy Industries Ltd.
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