Patent
1975-02-05
1976-01-06
Smith, Alfred E.
350288, 354152, G05D 2500, G03B 1912
Patent
active
039307212
ABSTRACT:
An adjustable speed projector including a continuously running shutter for repetitively interrupting the projection light path at a rate which is independent of the film frame rate, a source of film frame advance signals having a repetition rate controllable by an operator, and means for advancing a film by one frame in response to each advance signal at a time corresponding to the next succeeding interruption of the projection light path by the shutter so that the film is in motion only at times when the shutter interrupts the light path. The film-advancing mechanism includes a continuously rotating drive wheel, a driven wheel which is caused to engage the drive wheel for one cycle in response to each actuating signal, and a claw, one end of which is eccentrically mounted on the driven wheel and the other end of which engages a film sprocket hole to advance the film by one frame for each cycle of the driven wheel. A single spring urges the driven wheel into engagement with the drive wheel and also urges the claw into engagement with the film and against a lateral guide surface. Two-channel recording and playback apparatus is provided so that film frame advance signals recorded in synchronism with a sound track may be used to control the projector in the playback mode.
REFERENCES:
patent: 1449429 (1923-03-01), McNaughton
patent: 1962321 (1934-06-01), Moreno
patent: 2400483 (1946-05-01), Cameron
patent: 3825218 (1974-07-01), Krumbein et al.
Henry Jon W.
Smith Alfred E.
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