System and mechanism of feeding, traction, shuttering and film adjustment in programmable audiovisual apparatus, with rapid frame change

Audiovisual apparatus including film having a plurality of successive film frames and shutter means having a shutter frame, said film and shutter frames being situatable along a common optical axis for projection, comprising:

• a shaft mounted for rotation;
• a pulley mounted on said shaft for free rotation with respect thereto, said pulley being adapted for continuous rotation on said shaft;
• clutch means fixed to said shaft for rotation therewith;
• selectively actuatable ratchet means for coupling said clutch means when actuated to said continuously rotating pulley to rotate said shaft through only a single revolution;
• a solenoid coupled to said ratchet means for actuating the same upon receiving a pulse signal whereby said shaft rotates to a single revolution;
• said shutter means being mounted for rotation with respect to an axis to move said shutter frame between a projecting position in which said shutter frame is optically aligned with said optical axis for projection of said single film frame and an obstructing position wherein the shutter frame is out of alignment with with the optical axis so as to optically block projection of a film frame;
• shutter rotating means coupled to said shaft for rotating said shutter means from a projecting position through obstructing positions and then to a projecting position upon rotation of said shaft through a single revolution;
• and
• means for advancing said film coupled to said shaft by coupling means such that for each rotation of said shaft, said film is advanced a distance corresponding to a single film frame in a manner such that advancement of said film occurs only after said shutter means has obtained said obstructing position.