Motor-driven vertical type injection molding apparatus

Details Motor-driven vertical type injection molding apparatus Motor-driven vertical type injection molding apparatus

1994-07-05

1995-02-28

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, 425550, 425556, B29C 4577

Patent

active

053932102

ABSTRACT:
A motor-driven vertical type injection molding apparatus with stable screw back pressure is provided with a simple structure. A plurality of guide shafts extending in the perpendicular direction are integrally provided in a lower base of an injection unit. A screw holding member is supported on the plurality of guide shafts to be movable in the perpendicular direction. The screw holding member is moved in the perpendicular direction by an injection motor through a ball screw mechanism. A screw extension shaft is integrally connected to the upper end of a screw. The screw extension shaft is supported on the screw holding member to be movable in the axial direction and rotatable. The screw extension shaft and screw are rotated by a measuring motor. In a measuring step, the dead weight of the screw holding member automatically resists the reactive force (screw back pressure) of a molten resin at a screw tip end portion.

REFERENCES:
patent: 5092753 (1992-03-01), Kumamura et al.
patent: 5110522 (1992-05-01), Inaba et al.

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