Method and apparatus for individual control of injection...

Details Method and apparatus for individual control of injection... Method and apparatus for individual control of injection...

B - Operations, Transporting

29

C

18/711

B29C 45/28 (2006.01)

Patent

CA 1147118

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 on an actuating fluid manifold, allowing close juxtaposition. A cycle counter may be used to control inventory.

335543

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