Still-camera film transport system with motor deenergization at end of film

A film transport system for use in a still camera which utilizes film in cassette format and a shutter with a set state and an unset state, when the film is perforated at regular intervals with perforations and when each such perforation is associated with a corresponding individual film frame to enable each frame to be aligned with the shutter, comprising:

• a drive motor mechanically connected to the film and the shutter and urging the film to advance and urging the shutter to adopt the set state from its unset state after the motor is energized, the drive motor operating in a manner that after such energization, the drive motor will normally reach operating speed in a predetermined period of time;
• a perforation sensor fixed to the camera and detecting a perforation and lack of a perforation at a fixed location along a film path;
• a shutter sensor fixed to the camera and responsive to state of the shutter;
• a drive control means responsive to motor speed;
• a switch means connected to the drive motor and energizing and deenergizing the motor;
• and
• a supervisor circuit connected to the sensors, the switch and the drive control, the supervisor circuit operating in a manner so as to energize the motor to advance the film one frame and to cause the shutter to adopt its set state from its unset state and to deenergize the motor after the film has so advanced and after the shutter has so adopted its set state, the supervisor circuit further operating in a manner that in the event the drive motor has been energized for said predetermined period of time and has failed to reach operating speed within said predetermined period of time, the drive motor will be deenergized.