Film advance mechanism for motion picture apparatus
OwnerLeland R. Schmidtinventor
Life of this patent
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Abstract
A motion picture apparatus and method for the advancing motion picture film through the apparatus sequence by forced air. The film is initially placed into successive looped configurations formed by a cam-driven flipper. The loops and thus the film are advanced through the projector or camera pathway by a forced air blower which propels the loop through a projection pathway. Vacuum pressure is also applied to the film through a gate to secure the film to a gate with linearly arranged register pins steadying the film over a projection aperture. The film is rewound through the projector by a motorized rewind with a positive pressure applied to the film through the gate.
Claims17
A method for advancing film in a motion picture device, comprising the steps of:
- providing a takeoff spool to supply film;
- pivoting a flipper to form and release successive loops in the film at an entrance to an aperture position;
- and
- directing a flow of air onto the loop for blowing the loop across the aperture position and toward a film take-up spool.
A film advance mechanism comprising
- film input mechanism including a curved surface which is actuated to form and release a loop of the film to be moved past an aperture;
- film take-up mechanism taking up film having passed the aperture;
- an air pressure source providing a constant flow of air onto the loop of the film as the loop of the film is formed to propel the loop of the film past the aperture;
- two rows of register pins arranged in linear fashion between the film input mechanism and the film take-up mechanism for engaging perforated openings on the film.
A film advance apparatus comprising:
- a film takeoff reel;
- a film takeup reel;
- a film path between the film takeoff reel and the film takeup reel;
- an air blower for producing an air flow;
- an air blower passage for directing air from the air blower along the film path through the apparatus;
- a pivoting flipper for forming and releasing successive loops in the film, wherein the successive loops are propelled along the film path through the apparatus by the air flow.
A film advance apparatus comprising:
- a film takeoff reel;
- a film takeup reel;
- a film path between the film takeoff reel and the film takeup reel;
- an air blower for producing an air flow;
- an air blower passage for directing air from the air blower along the film path through the apparatus;
- a pivoting flipper for forming and releasing successive loops in the film, wherein the successive loops are propelled along the film path through the apparatus by the air flow;
- a rotating cam for pivoting the flipper, the cam being rotated at a speed to pivot the flipper at a rate corresponding to a desired film speed.
A motion picture projector comprising film input means for inputting the film, film takeup means for taking up the film having been passed through the projector, air input means for directing an air flow along a path through the projector while the film is being advanced, and a film looping means for forming and releasing successive loops of film, wherein said successive loops of film are propelled along the path through the projector by the air flow, said film looping means comprising a biased flipper with a crescent-shaped surface to mate with the film, said flipper being contacted by a cam which causes said flipper to successively engage and disengage the film.
Dependencies are inferred from the claim text.