Patent ID: 6238202
Filing Date: 2001-05-29
Classification: B29C,B29L,F16B,Y10S

Abstract:
An apparatus for ejecting a threaded injection molded article from a mold core having a core axis parallel to a machine axis of an injection molding machine, said apparatus comprising:a rotatable stripper ring coaxial with said mold core;a stripper ring rotator for rotating said stripper ring about said core axis;a translator for moving said stripper ring relative to said mold core in an axial direction parallel to said core axis;a driver for rotating said stripper ring rotator;said stripper ring rotator being mounted for rotation about a rotator axis parallel to said machine axis and having a radially extending stripper ring drive pinion which meshes with a stripper ring driven pinion extending radially about said stripper ring for causing rotation of said stripper ring about said core axis in response to rotation of said stripper ring rotator;said driver for rotating said stripper ring including a helically splined spindle connected at one end to and axially moveable by a machine ejector rod, said spindle engaging a corresponding axially extending helically splined bore in said stripper ring rotator to cause said stripper ring rotator to rotate in response to relative axial movement between said stripper ring rotator and said spindle imparted by said machine ejector rod;said stripper ring rotator having gear teeth extending radially thereabout and meshing with corresponding teeth on a transversely extending rack which forms part of said translator, said gear teeth causing transverse movement of said rack in response to rotation of said stripper ring; andsaid rack having at least one cam secured thereto and moveable therewith, said cam acting on a respective cam follower connected to said stripper ring to move said stripper ring in said axial direction at a controlled rate to synchronize translational and rotational movement of said stripper ring to correspond to the rate at which said threaded injection molded article unthreads.