Adjustment device for photographic enlarging or reproducing appa

Details Adjustment device for photographic enlarging or reproducing appa Adjustment device for photographic enlarging or reproducing appa

1976-11-17

1978-06-27

Griffin, Donald A.

Photocopying

Projection printing and copying cameras

Focus or magnification control

248125, G03B 2752, A47G 2900

Patent

active

040971449

ABSTRACT:
A device for displacing a body along a guiding column which is particularly suitable for the projection head of an enlarging or reproducing apparatus. The device comprises in a conventional manner a guiding column and, on the body, a friction wheel which presses against the column and which is disposed on a shaft. The shaft of the friction wheel is mounted in the sleeve-like body which surrounds the column except in the vicinity of the friction wheel. The friction wheel is sub-divided into two wheel portions and means are provided for exerting a force upon the wheel portions along the axis of the friction wheel. These means act upon a guiding surface of the column disposed at an angle of up to 90.degree. with respect to the friction wheel axis.

REFERENCES:
patent: 2298741 (1942-10-01), Lazna
patent: 2312562 (1943-03-01), Leonard et al.
patent: 2317692 (1943-04-01), Morin
patent: 3148853 (1964-09-01), Field
patent: 3533583 (1970-10-01), Azim

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