Driving apparatus for optical device of photographic printer

Photocopying – Projection printing and copying cameras – Identifying – composing – or selecting

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Details

355 45, 355 68, G03B 2752, G03B 2770, G03B 2774, G03B 2780

Patent

active

049262122

ABSTRACT:
A driving device for causing said optical device disposed in a photographic printer to move between the off-optical-axis position and the on-optical-axis position of the optical device. The optical device is driven by combination of a driving wheel, a driven wheel, and a flexible elongated member passed around the driving wheel and the driven wheel. A tension member is inserted between both ends of the elongated member in a looped state thereof. After the optical device has been driven by a predetermined distance, the driving wheel is further driven by a slight amount even after the first stopper of the optical device has come into contact with the second stopper to thereby loosen the portion of the elongated member defined between the driving wheel and the first stopper as well as to expand the tension member. Thereafter, when a predetermined strength of tension is applied, the portion of the elongated member which is wound around the driving wheel slips upon the driving wheel and thus the looseness of the elongated member is cancelled by the tensile force of the tension member. Accordingly, the optical device surely comes to a halt at a predetermined on-optical-axis position.

REFERENCES:
patent: 3094036 (1963-06-01), Benson
patent: 3480360 (1969-11-01), Mallory et al.
patent: 3623807 (1971-11-01), Gabler et al.
patent: 4367033 (1983-01-01), Watanabe
patent: 4557591 (1985-12-01), Serizawa et al.
patent: 4589767 (1986-05-01), Yanagi et al.
patent: 4592649 (1986-06-01), Freitag et al.
patent: 4786949 (1988-11-01), Yamamoto

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