Injection-molding machine and unthreading means therefor

Claim 1

IN AN INJECTION-MOLDING MACHINE, IN COMBINATION, A BED; A PAIR OF RELATIVELY DISPLACEABLE MAOLD MEMBERS MOUNTED ON SAID BED, ONE OF SAID MEMBERS BEING PROVIDED WITH AT LEAST ONE SCREW-THREADED MOLD CAVITY ADAPTED TO FORM A MOLDED ARTICLE THREADEDLY SEATED THEREIN; MEANS FOR INJECTING A SOLIDIFIABLE PLASTIC MASS INTO SAID CAVITY IN A CLOSED POSITION OF SAID MOLD MEMBERS; DRIVE MEANS FOR SWINGABLY OSCILLATING SAID ONE OF SAID MEMBERS ABOUT AN AXIS PARALLEL TO THE DIRECTIO OF RELATIVE DISPLACEMENT OF SAID MEMBERS OUT OF REGISTRY WITH THE OTHER MEMBER AND INTO AN UNTHREADING LOCATION; A HOLDER AT SAID UNTHREADING LOCATION DISPLACEABLE TOWARD AND AWAY FROM SAID ONE OF SAID MEMBERS UPON THE LATER OCCUPYING SAID UNTHREADING LOCATION; GRIPPER MEANS ON SAID HOLDER ENGAGEABLE WITH SAID ARTICLE FOR ROTATIVELY ENTRAINING SAME OUT OF SAID CAVITY, SAID GRIPPER MEANS INCLUDING A MATING CUP ROTATABLE ABOUT THE AXIS OF THE SCREW THREADS OF THE CONFRONTING CAVITY; AND DRIVE MEANS FOR ROTATING SAID CUP ABOUT THE LAST-MENTIONED AXIS AT RELATIVELY HIGH SPEED WHILE ADVANCING SAID CUP TOWARD SAID CAVITY FOR ENGAGE-ENT MENT WITH A MOLDED ARTICLE SEATED THEREIN AND FOR ROTATING SAID CUP IN THE OPPOSITE DIRECTION AT A RELATIVELY LOW SPEED DURING WITHDRAWAL OF SAID CUP FROM SAID CAVITY WHEREBY SAID ARTICLE IN UNSCREWED FROM SAID ONE OF SAID MOLD MEMBERS.