초록 ▼

An injection molding machine valve gate nozzle having a rack driven valve pin actuator for moving the valve pin between open and closed positions during each holding cycle of operation. The valve pin actuator is sealed from the fluid flow stream and the nozzle body has a valve pin guide which substa

An injection molding machine valve gate nozzle having a rack driven valve pin actuator for moving the valve pin between open and closed positions during each holding cycle of operation. The valve pin actuator is sealed from the fluid flow stream and the nozzle body has a valve pin guide which substantially separates the melt stream from the valve pin during passage through the nozzle for enhanced long-term operation. The actuator has a modular construction which lends itself to economical manufacture and efficient use in multiple drop or single drop molding machines without modification.

대표청구항 ▼

[ What is claimed is:] [1.] An injection molding apparatus comprising a valve gate nozzle for heating and controlling the flow of a melt stream through a valve gate to a mold cavity, said nozzle having a nozzle body, a valve pin axially movable within said body between valve gate closing and opening

[ What is claimed is:] [1.] An injection molding apparatus comprising a valve gate nozzle for heating and controlling the flow of a melt stream through a valve gate to a mold cavity, said nozzle having a nozzle body, a valve pin axially movable within said body between valve gate closing and opening positions, an actuator for moving said valve pin between said opening and closing positions during each molding cycle of operation, said actuator including a pinion fixed to said valve pin, a rack disposed for lateral movement transverse to said pinion, said rack being engageable with said pinion for rotating said pinion to simultaneously axially advance and retract said pinion and valve pin relative to said rack in response to reciprocating lateral movement of said rack, and a drive for laterally reciprocating said rack during each molding cycle of operation.