Optics: motion pictures – Camera and/or projector drive mechanisms – With intermittently driven carrier-engaging sprocket
Patent
1997-09-15
1999-02-23
Adams, Russell
Optics: motion pictures
Camera and/or projector drive mechanisms
With intermittently driven carrier-engaging sprocket
352190, G03B 124
Patent
active
058750207
ABSTRACT:
A motion-picture-projection system has a top intermittent sprocket (1) and a bottom intermittent sprocket (6) that are rotated intermittently in unison by mechanical and/or electrical means (8, 9, 19, 20, 21, 22, 23, 24) for conveyance of film (3) through a film gate (4) without formation of loops of film between the top intermittent sprocket and the film-gate outlet sprocket. To compensate for differences of length of unreeled film due to its cyclic advance and film-frame stoppage, compensatory loops (16, 17) are formed prior to instead of after a top intermittent sprocket and after instead of before a film-gate outlet sprocket. A film-contact surface (25, 26) of a film gate is arcuate and bordered with non-abrasive and suitably pliable material to minimize film wear. Air can be pumped onto the film for cooling and for distortion contamination resulting from heat absorption formation that is related to film "breathing". Electronic monitoring of film speed, frame-dwell time, heat, light, film noise, film flutters, film condition, compensatory-loop conditions, equipment functioning, equipment condition and other projection aspects with optionally automatic warnings, operational adjustments and electrical shutdown are provided. A use method is described.
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Kitten Stephen B.
Polla, Jr. Lawrence
Adams Russell
Livingston, Esq. Edward M.
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