Mold die assembly for use with a plastic injection molding...

Details Mold die assembly for use with a plastic injection molding... Mold die assembly for use with a plastic injection molding...

B - Operations, Transporting

29

F

18/711

B29F 1/022 (1980.01)

Patent

CA 1164177

METHOD AND APPARATUS FOR INDIVIDUAL CONTROL OF INJECTION MOLD SHUT-OFF BUSHINGS ABSTRACT OF THE DISCLOSURE A method and apparatus for multiple cavity injection molding which permits individual variation of gate opening time for mold shut-off bushings. The gate pins for the shut-off bushings are con- trolled by individual double-acting fluid motors, the bushings being fed by a common manifold. Gate opening is thus not dependent upon attainment of a predetermined injection pressure. Closure of the gate for each cavity will permit material to be fed faster to the other cavities. Novel means is provided for securing each gate pin -to its actuating cylinder, which minimizes heat transfer to the motor, accommodates expansion of the material manifold and permits gate opening adjustment. The fluid motors are end-mounted of an actuating fluid manifold, allowing close juxtaposition. A cycle counter may be used to control inventory.

421772

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