Method and apparatus for moving a motion picture film

Claim 1

A DRIVING DEVICE FOR A MOTION PICTURE FILM ALONG AN APERATURE PLATE OF A CAMERA OR PROJECTOR, COMPRISING AN APERTURE PLATE HAVING AN UPPER PORTION AND A LOWER PORTION, A WINDOW DEFINED IN SAID APERTURE PLATE BETWEEN SAID UPPER PORTION AND SAID LOWER PORTION, SAID UPPER PORTION INCLUDING A TOP PORTION, CONTINUOUS FILM FEEDING MEANS FOR FEEDING FILM ONTO SAID TOP PORTION AND ALONG SAID APERTURE PLATE, MEANS FOR RETAINING SAID FILM ADHERED ALONG SAID APERTURE PLATE WHILE SAID CONTINUOUS FILM FEEDING MEANS CONTINUOUSLY FEEDS FILM TO SAID TOP PORTION OF SAID APERTURE PLATE TO FORM AN INCREASING BUCKLE IN SAID FILM ADJACENT SAID TOP PORTION, MEANS FOR PRESSING THE UPPER END PORTION OF SAID BUCKLE UPON REACHING A PREDETERMINED SIZE ONTO SAID TOP PORTION, MEANS FOR MOVING SAID BUCKLE FORWARD IN A CATERPILLAR-LIKE MOVEMENT, ALONG SAID APERTURE PLATE OVER SAID UPPER PORTION, WINDOW AND LOWER PORTION TO THEREBY PUSH FORWARD SAID BUCKLE WHILE IMMOBILIZING, RELATIVE TO SAID APERTURE PLATE, THE PORTIONS OF THE FILM IN ADVANCE OF, AND FOLLOWING THE BUCKLE, AND SHUTTER MEANS ADAPTED TO SHUT SAID WINDOW UPON SAID BUCKLE PASSING BY SAID WINDOW, SAID WINDOW REMAINING OPEN AT LEAST PART OF THE TIME THE FILM IS FLAT AGAINST THE WINDOW.