Anti-backlash means for adjusting enlargers

Details Anti-backlash means for adjusting enlargers Anti-backlash means for adjusting enlargers

1976-10-07

1978-01-03

Hix, L. T.

Photocopying

Projection printing and copying cameras

Focus or magnification control

74409, 74422, G03B 2752, F16B 5518

Patent

active

040663566

ABSTRACT:
An anti-backlash means, particularly adapted for photographic enlargers including a channel shaped optical bench having a pair of guideways; a frame movable along the guideways, having a pair of tracks, a pair of rack elements, and leaf springs supporting the rack elements in continuous relation; a gear rotatably supported by the optical bench including a pair of gear elements engageable with the rack elements, and wheels riding on the tracks to maintain a fixed minor spacing between the pitch plane of the rack elements at the pitch radius of the gear elements; either the gear elements or the rack elements having offset teeth to eliminate backlash.

REFERENCES:
patent: 2472907 (1949-06-01), Kolesnikoff
patent: 2548603 (1951-04-01), Hallstrand
patent: 3361002 (1968-01-01), Stachlin

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