Injection apparatus having a check valve abnormality detector

Details Injection apparatus having a check valve abnormality detector Injection apparatus having a check valve abnormality detector

1991-04-29

1992-10-06

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Means responsive to abnormal condition completely stop...

425145, 425170, 425562, 425563, B29C 4577

Patent

active

051531496

ABSTRACT:
An injection apparatus of an injection-molding machine is described, including a servomotor for screw rotation including a pulse coder, the motor being driven in accordance with the difference between a command output from a control section of the injection-molding machine and an output from the pulse coder, thereby rotating a screw. During injection and pressure hold processes in which the motor is rendered nonoperative, the screw rotates as molten resin flows backward, if a check valve attached to the screw does not function normally, and this situation is detected as an abnormality of the check valve by a control section.

REFERENCES:
patent: 4718841 (1988-01-01), Kiya
patent: 4828473 (1989-05-01), Otake et al.
patent: 4851170 (1989-07-01), Shimizu et al.

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