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US 6,086,353 AGranted
Two-stage electric injection unit with rotating plunger
AssigneeCincinnati Milacron Inc.
InventorM. Barr Klaus
Life of this patent
Estimating the term…
Abstract
The invention is directed to a two-stage, all-electric injection unit. More specifically, an injection unit in which the feed screw is preferably used only for plastication and the injection of the plasticized material is accomplished by a separate accumulator having an electrically driven linear actuator, such as a ball screw mechanism. The plunger of the accumulator is configured with a helical flight and is rotatable by way of a one-way clutch interposed between the plunger and the ball screw.
Claims9
An injection molding machine including an injection unit comprising:
- a feed screw capable of rotational movement within a barrel having an inlet and an outlet,
- rotational drive means including a variable speed electric motor, for rotating the feed screw within the barrel in order to plasticize and convey material from the barrel inlet to the barrel outlet,
- a melt accumulator having a plunger received within a cylindrical chamber connected to receive plasticized material from the barrel outlet;
- and
- plunger drive means including a mechanism driven by an electric motor, for imparting translational and rotational movement to the plunger of the accumulator, thereby controlling the position of the plunger in the cylindrical chamber of the accumulator.
2 more elements
Dependencies are inferred from the claim text.