Valve pin actuation system for an injection nozzle
OwnerJesus M. Osuna-Diazinventor
Life of this patent
Estimating the term…
Abstract
An injection nozzle has gearing which drives a valve pin to open and close a mold gate, with a venting chamber in a nozzle body allowing vapors to escape before reaching the gearing to avoid fouling of the gearing. The valve pin is actuated by a hydraulic cylinder driving the gearing, which includes a pair of pinion gears driving gear teeth on either side of the upper end of the valve pin. An adjustable stop is provided limiting piston travel in either direction, allowing adjustment of both the closed and open positions of the valve pin.
Claims7
An injection molding apparatus including an injection nozzle having a nozzle body defining a gate through which melt is injected into a mold cavity, a shut off valve pin axially movable within said nozzle body, said valve pin having a tip at one end adapted to be moved to be disposed within the gate of said injection nozzle to close said gate, and moved to be withdrawn from said gate to open said gate;
- gearing means drivingly engaged with the opposite end of said valve pin to enable driving of said valve pin axially between said open and closed positions;
- said gearing means enclosed within a gearing cavity in said nozzle body;
- actuator means for operating said gearing means to cause said valve pin to be moved axially to open or close said mold gate;
- said gearing means comprising a set of gear teeth formed on opposite sides of said opposite end of said valve pin and a first pair of pinion gears each engaged with a seat of gear teeth on a respective side of said valve pin, said actuator means enabling oscillation of said pinion gears in opposite directions to axially drive said valve pin in opposite directions.
An assembly comprising a mold injection nozzle having a nozzle body formed with a mold gate, a valve pin movable in and out of said gate to close or open said gate, actuator means for moving said valve pin to close or open said gate, said actuator means for moving said valve pin to closed and opened positions with respect to said mold gate including a movable actuator member drivingly connected to said valve pin to move said valve pin between said opened and closed positions, and adjustment means associated with said actuator means to provide selective adjustment of the valve pin position in each of the opened and closed positions comprising first and second adjustable stops, each stop engageable with said movable member upon continued movement in respective directions, said movement causing said valve pin to be moved to said opened and closed positions.
Dependencies are inferred from the claim text.