Mold closing unit of an injection molding machine
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United States of America Patent
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-
Jun 3, 1986
Grant Date -
N/A
app pub date -
Aug 1, 1984
filing date -
Aug 3, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mold closing unit has a multi-way valve in a hydraulic supply line leading to a hydraulic traveling cylinder which is controlled as a function of a speed pattern specified for the movable mold clamping plate. The valve body of this multi-way valve is arranged on an elongated, threaded rotatable spindle in an axially movable manner. The spindle is connected with a stepping motor which is controlled as a function of the speed pattern. As soon as the movable mold clamping plate has reached a predetermined distance from the stationary mold clamping plate, the stepping motor is switched to a higher number of steps per revolution and the mold is closed below the creep rate.
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