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US 4,044,925 AGranted
Screw feeder for injection molding machine
AssigneeMcDowell-Wellman Engineering Company
InventorJames R. Mercer
Life of this patent
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AssigneeMcDowell-Wellman Engineering Company
InventorJames R. Mercer
Estimating the term…
A power-retractable feeder for an injection molding machine in which an actuator is adapted to forcibly seal a button-type outlet nozzle of the feeder against a side inlet port of a charging cylinder without developing an unbalanced lateral load on the cylinder. As disclosed, the reaction force developed on the actuator is transmitted to the side of the cylinder opposite the inlet. The actuator is selectively operable to retract the feeder nozzle from the cylinder for inspection, removal, maintenance, or the like. The disclosed feeder is of the screw type driven by a rotary motor through a coupler which isolates an axial reaction force on the screw from the motor. Also disclosed is a remote actuator and associated linkage for operating a shut-off valve in the feeder nozzle at either the extended or retracted position of the nozzle.
In an injection molding machine having a frame, a charging cylinder mounted on the frame including an internal charging chamber and an inlet port on the cylinder communicating with the charging chamber, the combination of a material stock feeder adapted to supply plasticized material to the charging chamber inlet, power actuator means for selectively moving an outlet of the material stock feeder into communication with the inlet of the charging chamber and alternately away from the inlet to automatically afford access to both the outlet and inlet, said power actuator means being constructed and arranged to develop fluidtight communication between said outlet and inlet while avoiding substantial unbalanced loading on the charging cylinder.
In an injection molding machine having a frame, a charging cylinder mounted on the frame, said charging cylinder including an internal charging chamber and a radial inlet port on one side of the cylinder communicating with the chamber, a feeder having means for pressurizing plasticized material stock and a nozzle for delivering the pressurized material stock to said inlet, said nozzle being adapted to engage said intet and form a seal therewith, power actuator means for selectively displacing said feeder radially with respect to said cylinder between extended and retracted positions at which said nozzle and inlet are respectively in engagement or separated sufficiently to provide access to said nozzle, said actuator having two parts adapted to forcibly move relative to one another, a clamping block disposed on a side of the cylinder opposite said inlet, said actuator having one of its relatively moving parts fixed to one of said feeder or clamping block units, tensioning means fixed at one side thereof to the other of said units extending in straddling relationship to said cylinder and fixed at the opposite side thereof to the other of said parts of said actuator.
Dependencies are inferred from the claim text.