Injection molding rack and pinion valve pin actuating mechanism

Details Injection molding rack and pinion valve pin actuating mechanism Injection molding rack and pinion valve pin actuating mechanism

B - Operations, Transporting

29

C

18/711

B29C 45/20 (2006.01) B29C 45/28 (2006.01)

Patent

CA 1303314

ABSTRACT OF THE DISCLOSURE A valve gated injection molding system having a double acting pneumatic rack and pinion valve pin actuating mechanism. The melt passage branches in a manifold from a central inlet and flows along the valve pin in a central bore in the nozzle to the gate. A pneumatically driven piston pivots a toothed pinion member mounted in a slot in the manifold. The pinion member engages a toothed rack member which reciprocates along a straight line in the slot in the manifold and engages an enlarged head of the valve pin in a slot in the rack member. Lateral forces from the pinion member are absorbed by sliding contact of surfaces of the rack member against matching surfaces of the slot and/or a valve pin bushing, and are not transmitted to the valve pin. This avoids uneven wear and buildup of melt deposits around the valve pin which can otherwise result in leakage and malfunction.

586166

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