Self-threading projector

Claim 1

IN A SELF-THREADING MOTION PICTURE PROJECTOR INCLUDING FRAME MEANS, UPPER AND LOWER SPROCKETS ROTATABLY MOUNTED ON THE FRAME MEANS AND AN APERTURE PLATE MOUNTED ON THE FRAME MEANS, THE COMBINATION THEREWITH OF A PAIR OF ARCUATE LOOP FORMERS PIVOTALLY MOUNTED ON ONE SIDE OF THE FRAME MEANS FOR MOVEMENT IN A PLANE PARALLEL TO SAID ONE SIDE OF THE FRAME MEANS BETWEEN AN OPEN AND A CLOSED POSITION FOR THREADING FILM IN THE PROJECTOR AS THE FILM IS ADVANCED BY THE UPPER SPROCKET, THE LOOP FORMERS BEING OPEN AT THE SIDES THEREOF MORE REMOTE FROM THE FRAME MEANS TO PERMIT EDGEWISE MOVEMENT OF THE FILM THEREFROM, A PRESSURE PLATE, A HINGED GATE MEANS CARRYING THE PRESSURE PLATE, AND A PAIR OF GUIDE PLATES MOVABLE BETWEEN OPEN AND CLOSED POSITIONS AND MOUNTED ON THE GATE MEANS FOR COVERING THE OPEN SIDES OF THE LOOP FORMERS TO PREVENT EDGEWISE MOVEMENT OF THE FILM THEREFROM WHEN THE GATE MEANS IS IN ITS CLOSED POSITION.