US 5,035,605 AGranted

Nozzle shut-off valve for an injection molding machine

AssigneeCincinnati Milacron Inc.

InventorsAlex Dinerman, Norman L. Steffens

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Abstract

A nozzle shut-off valve for the plastication system of an injection molding machine. The valve includes a cylindrical body member that has axially spaced inlet and outlet passageways. Inclined passageways that extend from the inlet and outlet passageways to the outer surface of the body member to terminate in spaced openings on the periphery of the inner body member. A tubular outer member is provided with at least one recess or depression on its inner surface, the recess having a length sufficient to provide communication between a pair of the spaced peripheral openings in the inner body member when the recess is positioned in overlying relationship with the respective openings. Rotation or translation of the tubular outer member relative to the inner body member shifts the recess out of registration with the respective peripheral openings, to thereby prevent flow of material through the valve. Shifting of the outer member is accomplished by means of a pneumatic cylinder that is carried by the inner body member to shift the tubular outer member relative to the cylindrical body member.

Claims25

Dependent claims

An injection molding machine comprising a nozzle shut-off valve for selectively opening and closing an injection outlet of a plastication barrel of the injection molding machine, said valve comprising:

an inner body member having a longitudinal axis and first and second ends spaced from each other along the longitudinal axis, the first end having an inlet opening and the second end having an outlet opening, and the inner body member further having an outer surface with a first opening in fluid communication with the inlet opening and a second opening in fluid communication with the outlet opening;
an outer member surrounding the inner body member, the outer member having an inner surface adapted to be slidably positioned on the outer surface of the inner body member to permit relative sliding movement between the inner body member and the outer member, the outer member further having communication means for providing fluid communication between the first and second openings of the inner body member in response to the outer member being in a predetermined position relative to the inner body member;
and
actuation means having a first part fixed in position relative to the inner body member and a second part movable relative to the first part and operatively connected with the outer member for shifting the outer member between a first position wherein thee is communication between the inlet opening and the outlet opening of the inner body member, and a second position wherein communication between the inlet opening and the outlet opening is precluded.

1 more element

Dependencies are inferred from the claim text.