Synchronization system of the cine-projector with the sound tape reproducer

A motion picture projection apparatus capable of synchronizing a film feeding speed with the tape speed of a sound tape recording apparatus with reference to the standard pulses coming from a pulse generating means for producing standard pulses with a frequency corresponding to the tape speed mounted on said tape recording apparatus, comprising:

• a. a driving means having at least one rotatable driving axis;
• b. a film feeding means;
• c. a pulse generating means for producing pulses with a frequency corresponding to the film feeding speed of the film feeding means;
• d. a control means, said means having two input terminals thereof, one of which being adapted to receive the output pulse coming from the pulse generating means of said sound tape recording apparatus, the other of which being adapted to receive the output pulse coming from the pulse generating means of said apparatus as well as one output terminal thereof for detecting the pulse differences of said two pulse signals adapted to be respectively supplied to said two input terminals and for providing signals at the output therefrom for the time by the phase difference;
• e. a driven means actuated by the driving force of said driving means to operate said film feeding means, said driven means having at least one rotary shaft arranged to be substantially in parallel with the rotatable driving axis of said driving means;
• f. a power transmission means, said means including:
• a pair of cone pulleys arranged to be inversely tapered off to each other in a form of trapezoidal profile, one of which being fixedly mounted on the rotary shaft of said driven means, the other of which being fixedly mounted on the rotational driving axis of said driving means, and
• an endless belt stretched around said cone pulleys;
• g. a power transmission ratio variable means capable of varying the power transmission ratio of said power transmission means, said variable means including:
• a displacing means for transferring said endless belt along said rotary shaft of said rotational driving axis;
• and
• a reset means for constantly exerting the action thereof on said displacing means so as to actuate said displacing means for again removing said endless belt to a predetermined position;
• h. an operating means for forcedly transferring said displacing means toward another direction against the force energized by said reset means, said operating means being connected with the output terminal of said control means to be operative until the output of said control means is discontinued.