Variable magnification copying device

Details Variable magnification copying device Variable magnification copying device

1981-03-16

1983-12-13

Hayes, Monroe H.

Photocopying

Projection printing and copying cameras

Focus or magnification control

G03B 2752

Patent

active

044202482

ABSTRACT:
A varying magnification copying device of small size and low manufacturing cost in which a region of movement of a zoom lens system for an enlargement copying operation is shared with a region of movement of a half-speed mirror for the equal magnification and reduction copying operations. The zoom lens system is moved along the optical axis thereof by a feed screw rotated by a digitally-controlled stepping motor. The zoom lens system, which includes front and rear frames varying front and rear lens systems, is adjsuted in magnification factor by a cam and cam follower mounted on the rear and front frames, respectively. The cam is rotated by a pinion gear which is engaged with a rack which extends parallel to the feed screw. Movement of the zoom lens system perpendicular to the optical axis is accomplished through a lead cam and cam follower.

REFERENCES:
patent: 1498472 (1924-06-01), Mohler
patent: 2704484 (1955-03-01), Schwesinger
patent: 3355236 (1967-11-01), Taillie et al.
patent: 3901586 (1975-08-01), Suzuki et al.
patent: 4077710 (1978-03-01), Ward et al.
patent: 4107714 (1978-08-01), Raab
patent: 4142793 (1979-03-01), Schilling
patent: 4209248 (1980-06-01), Gibson et al.

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