Photocopying – Projection printing and copying cameras – Illumination systems or details
Patent
1988-12-30
1990-02-27
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Illumination systems or details
3542341, 354250, G03B 2772, G03B 908, G03B 910
Patent
active
049050435
ABSTRACT:
A shutter driving apparatus for use in a photographic printer to drive a shutter for opening and closing the path of light which is incident on a photographic paper comprises a pulse motor for causing the shutter to pivot so as to open and close the light path, first and second stoppers which are arranged to come into contact with the pivoting shutter to thereby dispose it in a position for opening the light path and a position for closing the light path, respectively, a controller for suspending the operation of the pulse motor when the shutter which is being pivoted in the direction for closing the light path by means of the pulse motor reaches a position which is immediately in front of the light path closing position, and a spring for biasing the shutter toward the light path closing position with torque which is smaller than the starting torque and holding torque of the pulse motor and greater than the detent torque thereof. Accordingly, it is possible to reduce the impact with which the shutter strikes against the first and second stoppers.
REFERENCES:
patent: 3886567 (1975-05-01), Matsumoto et al.
patent: 4512657 (1985-04-01), Sakato
patent: 4696559 (1987-09-01), Kondo
patent: 4712910 (1987-12-01), Sakato
patent: 4727399 (1988-02-01), Matsumoto et al.
patent: 4768051 (1988-08-01), Sasaki
patent: 4806990 (1989-02-01), Tahara
patent: 4839680 (1989-06-01), Amada et al.
Satou Hiroyuki
Takemoto Satoru
Tsuji Junichi
Wakui Hiromitsu
Fuji Photo Film Co. , Ltd.
Wintercorn Richard A.
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