Intermittent prime film mover using multi-toothed wheel drive
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United States of America Patent
Stats
-
Aug 5, 1980
Grant Date -
N/A
app pub date -
Mar 22, 1979
filing date -
Mar 22, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An improved intermittent drive for a motion picture film projector having a film gate, condenser lens, light source and shutter means is provided by a relatively large sprocket wheel having forty sprocket teeth with 12 to 14 teeth engaging the film at the sprocket holes. This sprocket wheel is driven by a servo motor capable of rapid start and stop and high-speed motion under electronic control. The sprocket wheel supports the film between the film gate aperture (light gate) and the condenser lens. The sprocket wheel is of sufficiently large diameter so as to provide a circumferential curvature that does not appreciably change the vertical plane of a single frame of film thereon.
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