Timing adjustment for reverse movie photography

Details Timing adjustment for reverse movie photography Timing adjustment for reverse movie photography

1989-11-21

1991-12-24

Hayes, Monroe H.

Optics: motion pictures

Shutters

Rotary

352164, 352165, 352173, G03B 910

Patent

active

050746570

ABSTRACT:
A method and mechanism for adjusting the timing of a camera in the reverse mode while allowing for separate adjustment of the timing in the forward mode. In a preferred embodiment, an external switch is provided which when actuated switches the camera between the timing setting for the forward direction and the timing setting for the reverse direction. A helical driven gear which engages a drive gear driven by the motor is axially translatable between a first position corresponding to the forward direction and a second position corresponding to the reverse direction. Since it is a helical gear, the amount of axial translation adjusts the relative angular position of the shutter with respect to the frame advance mechanism.

REFERENCES:
patent: 1355569 (1920-10-01), Power
patent: 1455393 (1923-05-01), Doherty
patent: 1543597 (1925-06-01), Brautigam
patent: 1746385 (1930-02-01), Dina
patent: 1854504 (1932-04-01), Dina
patent: 2017589 (1935-10-01), Dina
patent: 2260569 (1941-10-01), Holmes
patent: 2974840 (1961-03-01), Kuhnert et al.
patent: 3447868 (1969-06-01), Krumbein
patent: 3675996 (1972-07-01), Wilsch et al.

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