Load determining device for an electrically-operated...

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

Reexamination Certificate

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Details

C425S147000, C425S166000, C425S169000

Reexamination Certificate

active

11056369

ABSTRACT:
A load determining device for an electrically-operated injection molding machine in which a load exerted on a movable part is detected based on the motor current or by an observer, with removing the influence of motor temperature. Upon start of continuous molding, a maximum load detected during retreat motion of an ejector or movable part is stored as a reference value Lr0. In every molding cycle, a maximum detected load Lra during the retraction of the ejector is determined. In the next molding cycle, load La detected during advance of the ejector is corrected based on the reference value Lr0and the maximum detected load Lra to eliminate the influence of motor temperature rise, thereby determining the load Lfx(n) during the advance of the ejector. When there occurs a change in temperature of the ejector driving motor, the load detected based on the motor current or by the observer varies even if the actual ejector load is constant. By eliminating the influence of temperature change, the load can accurately be detected.

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