Self-threading motion picture projector

Claim 1

IN AN AUTOMATIC SELF-THREADING MOTION-PICTURE PROJECTOR OF THE TYPE IN WHICH A FILM IS FED BY FILM TRANSPORT MEANS THROUGH A FILM GATE TO A DRIVEN FILM TAKE-UP REEL HAVING MEANS FOR AUTOMATICALLY GRIPPING THE END OF A FILM FED THERETO FOR WINDING ON SAID TAKE-UP REEL, AND INCLUDING MOVABLE LOOP-FORMERS THROUGH WHICH SAID FILM IS GUIDED IN ITS PASSAGE BETWEEN SAID FILM GATE AND FILM TRANSPORT MEANS, SAID LOOP FORMERS HAVING A CLOSED POSITION WHICH THEY OCCUPY WHEN FILM IS BEING THREADED THROUGH SAID PROJECTOR AND AN OPEN POSITION IN WHICH SAID FILM FORMS FREE LOOPS ON BOTH SIDES OF SAID FILM GATE AND TOWARD WHICH OPEN POSITION THEY ARE BIASED; THE IMPROVEMENT COMPRISING A LATCH MOVABLE BETWEEN A LATCHED POSITION RELEASABLY HOLDING SAID LOOP-FORMERS IN THEIR CLOSED POSITION AND AN UNLATCHED POSITION IN WHICH SAID LOOPFORMERS ARE RELEASED FOR MOVEMENT TO THEIR OPEN POSITION, BIAS MEANS URGING SAID LATCH TO THE LATCHED POSITION, AND A RELEASE TRIGGER FOR SAID LATCH INCLUDING A GUIDE