Photographic printing or enlarging apparatus

Details Photographic printing or enlarging apparatus Photographic printing or enlarging apparatus

1979-04-30

1980-12-16

Hix, L. T.

Photocopying

Projection printing and copying cameras

Focus or magnification control

354195, 350187, 350255, G03B 2752, G02B 1514, G02B 704

Patent

active

042393825

ABSTRACT:
A photographic printing or enlarging apparatus incorporates a negative carrier, a lens stage, and a positioning device for positioning the lens stage toward and away from a negative carrier. The positioning device comprises a body and one or more push rods each of which is mounted on, and releasably secured to, the body for movement in the direction of its length. A selected push rod is positioned to engage the lens stage, or a part of the apparatus connected to the lens stage, to fix the position of the stage relative to the negative carrier in accordance with the predetermined setting of the selected push rod. The positioning device may incorporate a plurality of push rods or may incorporate a single push rod that may selectively be extended and locked in an extended position to contact a portion of the apparatus connected to the lens stage for fixing the distance between the lens stage and the negative carrier.

REFERENCES:
patent: 2239760 (1941-04-01), Simmon
patent: 3228284 (1966-01-01), Kallenberg
patent: 3584951 (1971-06-01), Fujimoto
patent: 3856398 (1974-12-01), Taylor
patent: 4061424 (1977-12-01), Onishi

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