Two-stage electric injection unit with rotating plunger
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United States of America Patent
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Jul 11, 2000
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N/A
app pub date -
Feb 17, 1998
filing date -
Feb 17, 1998
priority date (Note) -
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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.
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