Lens switching mechanism for use in copying machine

Details Lens switching mechanism for use in copying machine Lens switching mechanism for use in copying machine

1976-07-27

1977-11-29

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

G03B 2770

Patent

active

040603245

ABSTRACT:
A copying machine includes a system for projecting an image of an original onto a photosensitive member selectively at one of a plurality of magnifications. The projection system includes two lenses. A movable carriage supports the lenses. The carriage is arranged for movement between a first position wherein one of the lenses is operative and a second position wherein the other of the lenses is operative. Adjustable stops are provided for stopping the carriage at the first or second positions. An overcenter device responsive to the movement of the carriage more than half its distance of travel between the first and second positions operates to move and bias the carriage against the stops.

REFERENCES:
patent: 3476478 (1969-11-01), Rees
patent: 3542467 (1970-11-01), Ferguson et al.
patent: 3733128 (1973-05-01), Naumann et al.
patent: 3779642 (1973-12-01), Ogawa et al.
patent: 3843254 (1974-10-01), Pramstraller et al.
patent: 3936150 (1976-02-01), Ikeda

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