Document Type and Number:
Japanese Patent JPS4910734
Kind Code:
A
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.
More Like This:
Application Number:
JP3047773A
Publication Date:
January 30, 1974
Filing Date:
March 15, 1973
Export Citation:
International Classes:
G03B21/38; G03B21/32; G03B21/48; G03B31/02; (IPC1-7): G03B21/43
Domestic Patent References:
| JP43008735A | ||||
| JPS334372Y1 |