Motion picture projector system

Apparatus for advancing a frame of a motion picture film during the closed position of a shutter comprising, a servo motor, means connecting said servo motor to said film, means for generating a signal indicating a closing of said shutter, switch means for providing a selected frame rate command, means for providing signals in response to successive predetermined angular positions of the servo motor shaft, circuit means responsive to said shutter-closed signal and said frame rate command and said angular position responsive signals in sequence for producing acceleration, constant velocity and deceleration signals in sequence and, means responsive to said acceleration, constant velocity and deceleration signals for controlling said servo motor to advance said frame.

In a motion picture projector having a projector station, the combination comprising a capstan and capstan motor for driving film, solid state switch means for supplying current to drive said capstan motor in either direction of rotation, means for determining and providing a signal indicating the amount of film stored between said capstan and said projection station, means responsive to said stored film signal for providing a signal to said solid state switch, means to drive said capstan motor in the proper direction to maintain a substantially constant amount of stored film, and a reel and reel motor for providing film to and receiving film from said capstan.

In a motion picture projector having a pay-out reel motor and a take-up reel motor, a circuit for controlling said reel motors for fast winding of film from said pay-out to said take-up reel comprising, a solid state switch means for each reel motor for supplying current thereto, a control switch coupled to each solid state switch means, logic switching means having respective outputs connected to said control switches, respectively, for providing fast wind signals to cause current to be supplied to said take-up reel motor for fast winding of film, and means between said solid state switching means for said take-up reel and said logic switching means for providing a logic signal to said logic switching means indicating the conductive state of said solid state switching means, said logic switching means being arranged to provide a signal to said control switch of said pay-out reel motor to cause current to be supplied to said motor when said take-up reel solid state switch is conductive and said fast wind signal to said take-up reel control switch is removed, whereby said current to said pay-out reel motor brakes said pay-out and take-up reels.

Apparatus for projecting motion picture film at variable rates of speed comprising means defining a frame aperature, means for projecting a beam of light through said aperature, a shutter for interrupting said light beam by successively closing and opening at a substantially fixed rate, means for generating a signal indicating a closing of said shutter, a servo motor and means for connecting said servo motor to a strip of film, switch means for selecting a frame projection rate, means operatively connected to said switch means and to said shutter-closed signal generating means for producing a command signal to advance a frame during the closed position of said shutter in accordance with the selected frame projection rate, circuit means responsive to said command signal producing means for controlling said servo motor to cause it to position a frame of said film in said aperature.