Focal plane shutter

Details Focal plane shutter Focal plane shutter

1976-12-15

1978-08-22

Griffin, Donald A.

G03B 928

Patent

active

041092651

ABSTRACT:
A focal plane shutter comprises a first and a second blind, a take-up and a winding drum supporting the opposite ends of the first blind, a take-up and a winding drum supporting the opposite ends of the second blind, a first blind winding pinion and a second blind winding pinion having an operationally integral relationship with the first and the second blind winding drum, respectively, and a pair of shutter winding sector-shaped gears in meshing engagement with the first and the second blind winding pinion, respectively, and adapted to rotate in response to a shutter charging command. Each of the sector-shaped gears have a hiatus which is located opposite to the associated pinion to release the meshing engagement when no shutter winding operation takes place. The sector-shaped gears and the pinions are located relative to each other in a manner such that rotation of the first blind winding pinion precedes rotation of the second blind winding pinion when a shutter winding operation is to be commenced.

REFERENCES:
patent: 1458211 (1923-06-01), Kingsbury
patent: 3468236 (1969-09-01), Renlschler et al.
patent: 3491673 (1970-01-01), Forys
patent: 3739704 (1973-06-01), Okeyoma

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