Injection molding apparatus with shut off valve pin actuation system
OwnerJesus M. Osuna-Diazinventor
Life of this patent
Estimating the term…
Abstract
Injection molding apparatus is disclosed having an actuation system for operation of a shut off valve pin, movably mounted in a valve gate, the system including a first gear rack connected to the valve pin, a first pinion gear driven by the first gear rack connected at one end of a cross shaft, a second pinion gear at the other end of the cross shaft, and a externally mounted two way power cylinder operating a second gear rack to rotate the second pinion gear in mesh therewith so that both pinion gears rotate together, and the valve pin is reciprocated by operation of the power cylinder. The power cylinder is mounted for angular adjustment about the axis of rotation of the pinion gears and cross shaft to enable ready adjustment of the closing position of the valve pin in the valve gate.
Claims7
An injecting molding apparatus including an injection nozzle having a gate through which melt is injected into a mold cavity, an actuation system for a shut off valve pin, said valve pin having a tapered tip disposed within the gate of said injection nozzle, said actuation system comprising:
- a first gear rack connected to said valve pin to extend upwardly therefrom;
- a rotatably mounted first pinion gear meshing with said first gear rack;
- a power cylinder including a cylinder housing, and a piston movably disposed in a bore formed in said cylinder housing;
- a second gear rack connected to said piston to be reciprocated by movement of said piston in said bore;
- a rotatably mounted second pinion gear in mesh with said second gear rack connected to said piston;
- a cross shaft mounted or rotation about an axis extending through the length of said cross shaft, said cross shaft drivingly connecting said first and second pinion gears to rotate together about said axis of said cross shaft;
- means for supplying fluid pressure to said bore to cause said piston to move so as to drive said connected first gear rack, said first and second pinion gears, and said second gear rack connected to said valve pin to move said valve pin to a closed position in said gate;
- and,
- means for selectively allowing adjustment of the angular position of said cylinder housing about an axis aligned with the axis of rotation of said cross shaft to thereby enable adjustment of said closed position of said valve pin in said gate.
Dependencies are inferred from the claim text.