Optics: motion pictures – Camera and/or projector drive mechanisms – With intermittently driven carrier-engaging sprocket
Patent
1975-09-29
1977-05-10
Hayes, Monroe H.
Optics: motion pictures
Camera and/or projector drive mechanisms
With intermittently driven carrier-engaging sprocket
352160, 352173, 352180, G03B 124
Patent
active
040225259
ABSTRACT:
A motion picture projector having an improved electric transport system for incrementally advancing film through a light gate. A constant, but adjustable, velocity rotating shutter periodically interrupts the projected picture to permit advancing the film through the light gate to the next frame. As the shutter moves to a position blocking the projected picture, a shutter position detector generates a signal for triggering a control circuit which drives an electric servomotor to rotate a film drive sprocket. The servomotor is driven to rotate the sprocket to advance the film one frame and then to hold the sprocket in a fixed position to prevent any motion of the film while the picture is projected. Power is applied from a non-linear control circuit to the servomotor. Error signals applied to the servomotor are of a peak magnitude when the servomotor is stopped with the film framed in the light gate so that small position errors drive the servomotor to the desired position with a maximum torque. The servomotor may be run continuously or intermittently in a reverse direction for rewinding the film back through the projector at a constant high speed.
REFERENCES:
patent: 3248029 (1966-04-01), Money
patent: 3819258 (1974-06-01), Butler
Eprad Incorporated
Hayes Monroe H.
Todd, Jr. Oliver E.
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