Focal plane shutter

Details Focal plane shutter Focal plane shutter

1976-07-15

1978-04-11

O'Connor, Edna M.

354244, G03B 934

Patent

active

040841707

ABSTRACT:
A focal plane shutter includes a pair of pinions which are integrally provided on the winding drums of a first and a second screen, and a drive gear which is adapted for meshing engagement with the pinions and adapted to rotate to wind up the screens when a film winding operation is desired. The gear is provided with a hiatus of a circumferential length which releases the meshing engagement between the gear and the pinions, and which is normally located opposite to the pinions except for the screen winding operation. During the screen winding operation, the gear initially engages the pinion on the winding drum of the first screen and then engages the pinion on the winding drum of the second screen, thus assuring that the first screen runs first and then the second screen follows, completing a winding operation of both screens while they are in overlapping relationship.

REFERENCES:
patent: 3913117 (1975-10-01), Endo et al.

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