Injection molding machine having a machine screw driving gear

Details Injection molding machine having a machine screw driving gear Injection molding machine having a machine screw driving gear

1993-06-28

1994-11-22

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

366 78, 425558, 425561, B29C 4577

Patent

active

053663667

ABSTRACT:
A downsized screw driving gear supports a heavy reaction force from a screw used in preplasticization type injection molding machine. Motor rotation is directly transmitted to the screw during plasticizing by a piston member. Reaction forces from the screw are supported with a thrust bearing arranged in a hydraulic chamber, while the radial load of the piston member is supported with bushes. Hydraulic pressure is supplied to the hydraulic chamber in the injection process to advance the screw with the piston member, disconnecting a path to the injection chamber. Oil supplied from the hydraulic chamber immerses the thrust bearing and penetrates to the sliding faces of the bushes.

REFERENCES:
patent: 4718840 (1988-01-01), Inaba et al.
patent: 4722679 (1988-02-01), Farrell
patent: 4828473 (1989-05-01), Otake et al.
patent: 5011399 (1991-04-01), Farrell

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