In-line screw type injection molding machine

Details In-line screw type injection molding machine In-line screw type injection molding machine

1991-10-08

1993-08-03

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

264 404, 366 78, B29C 4576

Patent

active

052327140

ABSTRACT:
An in-line screw type injection molding machine having a screw in a heating cylinder. The screw is driven and rotated by a motor to charge a feedstock resin into the cylinder, the screw simultaneously undergoing retracting movement to allow the molten resin to be stored in the cylinder, and is driven and advanced to inject the molten resin. The machine includes an oscillator for outputting a movement signal in accordance with the retracting movement of the screw, a first calculator for calculating, from the movement signal, the position of the screw, and for outputting a position-detection signal, a position command signal generator for outputting a screw position command signal with the initial position at which the screw has started its retracting movement serving as the reference, a second calculator for calculating the difference between the position command signal and the position detection signal, and for outputting a difference signal, and a control section for controlling the driving of the motor on the basis of the difference signal. Preferably, the machine further includes a detector for detecting the number of revolutions per unit time of the screw, and for outputting a number of revolutions detection signal, so that the control section may correct the difference signal on the basis of the number of revolutions detection signal.

REFERENCES:
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Patent Abstracts of Japan, vol. 11, No. 6 (M-551) (2453), Jan. 8, 1987, & JP-A-61 182 913, Aug. 15, 1986.
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