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
1993-06-21
1995-01-10
Heitbrink, Tim
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
264 407, 425149, 425170, B29C 4577
Patent
active
053801814
ABSTRACT:
A control device for an electric injection molding machine designed to advance and retract a screw in a heating cylinder by an injection motor includes a screw position detector for detecting a screw position to output a screw position detection signal, a speed pattern generator for generating a speed setting pattern signal which indicates relationship between time and screw speed. An integration unit integrates the speed setting pattern signal to obtain a moving stroke of the screw. And a generation unit generates a position instruction signal on the basis of the moving stroke and a screw position when injection is initiated. To generate a speed instruction signal, the screw position detection signal is subtracted from the position instruction signal as a manipulated variable of feedback and the speed setting pattern signal is applied to the position instruction signal as a manipulated variable of feed forward. Thus, accuracy at the speed changing positions can be improved, thus improving operability.
REFERENCES:
patent: 4851170 (1989-07-01), Shimizu et al.
patent: 4851171 (1989-07-01), Shimizu et al.
patent: 4968462 (1990-11-01), Hara
Hiraoka Kazuo
Taniguchi Katsuhiko
Heitbrink Tim
Sumitomo Heavy Industrie's, Ltd.
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