Motion picture projector drive mechanism

Claim 1

IN MOTION PICTURE DRIVE MECHANISM, A CASING PROVIDING A VERTICAL WALL, A MAIN CONTROL ARM SLIDABLY MOUNTED FOR SUBSTANTIALLY VERTICAL MOVEMENT WITH RESPECT TO SAID WALL, ACTUATING MEANS ENGAGED WITH SAID CONTROL ARM AT ONE END THEREOF FOR ACTUATING THE SAME, DRIVE MEANS INCLUDING A FRICTION DRIVE RING, SAID DRIVE RING BEING POSITIONED SUBSTANTIALLY TRANSVERSELY WITH RESPECT TO THE PATH OF MOVEMENT OF SAID CONTROL ARM, A BRACKET SLIDABLY MOUNTED ON SAID WALL FOR MOVEMENT PARALLEL TO THAT OF SAID MAIN CONTROL ARM, A DRIVE PULLEY INCLUDING A DRIVING RING CARRIED BY SAID BRACKET AND MOUNTED FOR MOVEMENT OF SAID DRIVING RING INTO AND OUT OF ENGAGEMENT WITH SAID FRICTION DRIVE RING ON SLIDING MOVEMENT OF SAID BRACKET, A LATERAL ARM CARRIED BY SAID CONTROL ARM AND FORMED FOR ENGAGEMENT WITH SAID BRACKET TO MOVE SAID BRACKET AND SAID DRIVING RING CARRIED THEREBY OUT OF ENGAGEMENT WITH SAID FRICTION RING IN ONE DIRECTION OF MOVEMENT OF SAID CONTROL ARM, A STUD SHAFT FOR THE WINDING UP OF FILM, A DRIVEN PULLEY CARRIED BY SAID STUD SHAFT AND A RESILIENT DRIVE BELT INTERCONNECTING SAID DRIVEN PULLEY AND SAID DRIVE PULLEY FOR DRIVING SAID DRIVEN PULLEY, AND SAID RESILIENT DRIVE BELT IN THE OTHER DIRECTION OF MOVEMENT OF SAID CONTROL ARM SERVING BY RESILIENT ACTION TO SLIDE SAID BRACKET INTO POSITION TO BRING SAID DRIVING RING OF SAID DRIVE PULLEY INTO DRIVING ENGAGEMENT WITH SAID FRICTION RING.