Optics: motion pictures – Camera and/or projector drive mechanisms – With intermittently driven carrier-engaging sprocket
Patent
1976-04-19
1977-11-08
Hayes, Monroe H.
Optics: motion pictures
Camera and/or projector drive mechanisms
With intermittently driven carrier-engaging sprocket
352124, 352190, 226 76, 226 79, G03B 124
Patent
active
040573354
ABSTRACT:
A film drive for a motion-picture camera or projector has a film drive wheel which is rotatable about a first axis and has a plurality of angularly equi-spaced and radially extending teeth. A function cam rotatable about a second axis spaced from and perpendicular to the film axis has a generally helical peripheral formation which engages with the teeth of the wheel. This helical formation includes an intermittent-drive section having a holding portion constituting almost a complete turn of the formation of zero degree pitch and a switching portion at each end of the holding portion of predetermined pitch greater than zero degrees, and a constant-drive section of constant pitch greater than zero degrees and axially offset from the intermittent-drive section. A shifter is provided for displacing the function cam along its axis relative to the drive wheel so that the teeth on the drive wheel either engage the intermittent-drive section or one of the constant-drive sections axially flanking the intermittent-drive section. A motor is connected to the function cam and rotates it at a relatively slow speed in a forward direction when the teeth of the drive wheel are engaged with the intermittent drive section so as to rotationally step this drive wheel. When engaged with one of the constant-drive sections the motor rotates the function cam at a relatively elevated forward speed for fast-forward motion of the film, and when teeth are engaged with the other constant-drive section the motor rotates the function cam in the opposite direction for fast rewind of the film.
REFERENCES:
patent: 1847312 (1932-03-01), Seufert
patent: 2559509 (1951-07-01), Mercier
Hayes Monroe H.
Robert & Bosch GmbH
Striker Michael J.
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