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
1992-12-16
1994-08-09
Bushey, Charles S.
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
264 405, 425149, B39C 4500
Patent
active
053360737
ABSTRACT:
A pressure feedback system for limiting pressure and a minor feedback system connected to the pressure feedback system are used as a speed feedback system for controlling an injection speed. Consequently, the injection speed is controlled on the basis of an injection speed setting signal using the minor feedback system, and a filling pressure is controlled on the basis of a limit pressure setting signal using the pressure feedback system for limiting pressure. Also, a switch for selectively activating the pressure feedback system and a comparator for comparing the limit pressure setting signal with a filling pressure detection signal are provided within the pressure feedback system. The switch activates the pressure feedback system when the filling pressure detection signal is equal to or larger than the limit pressure setting signal. A normal injection speed control operation is performed until the switch activates the pressure feedback system. After the connection of the switch, a control operation in which the filling pressure is limited is performed until the dwelling process begins.
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Bushey Charles S.
Sumitomo Heavy Industrie's, Ltd.
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