Screw rotating and advancing device for an injection molding mac

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

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264 407, 366 78, 425149, B29C 4577

Patent

active

054217121

ABSTRACT:
A screw rotating and advancing device for an injection molding machine, in which a movable pressure plate is provided with a servomotor to drive a ball screw in association with a ball nut provided at a rear fixing plate, so that the movable pressure plate homogeneously drives a screw shaft passing through a front fixing plate to perform the operations of injection, holding pressure, and measuring back-pressure; and accomplish a close-loop control of the pressure of molding material by using a force sensor. The other side of the movable pressure plate is provided with a servomotor to rotate the screw shaft, so that the rotational speed of the screw shaft can be precisely controlled. Furthermore, the present invention includes a pre-load system including at least two pre-loaded hydraulic cylinders, at least tow pistons and a communicating tube to balance the pressure difference between the prepressurized hydraulic cylinders. Whereby the length of the device can be reduced to save the room occupied by the injection molding machine, and the wearing-out caused by the using of conventional spline shaft and spline groove can be avoided. The present invention also provides evenly force to drive the movable pressure plate and a close-loop control for injection pressure of the molten material, to facilitate precisely injection molding processing.

REFERENCES:
patent: 4693676 (1987-09-01), Inaba
patent: 4718840 (1988-01-01), Inaba et al.
patent: 4828473 (1989-05-01), Otake et al.
patent: 4988273 (1991-01-01), Faig et al.
patent: 5129808 (1992-07-01), Watanabe et al.
patent: 5206034 (1993-04-01), Yamazaki

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