Adjustment device for photographic enlarging or reproducing apparatus
AssigneeRollei-Werke Franke & Heidecke
InventorClaus Prochnow
Life of this patent
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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.
Claims12
Device for displacing a body along a guiding column particularly suitable for the projection head of an enlarging or reproducing apparatus, said device comprising:
- a. a guiding column including a pair of guiding surfaces extending along the column;
- b. a sleeve substantially surrounding said guiding column, having an opening located over said pair of guiding surfaces;
- c. a shaft mounted on said sleeve across said opening with its axis of rotation extending tangent to said guiding column in a plane perpendicular to the direction of extension of said guiding column;
- d. a pair of friction wheels disposed on said shaft, at least one thereof being axially moveable on the shaft and extending through the opening in said sleeve to roll along said guiding column, each wheel having a lateral surface normally respectively held in rolling contact with a guiding surface of said pair;
- said guiding surface and said lateral surface forming an acute angle with each other;
- and,
- e. means for exerting axial forces on said wheels of the pair to force their lateral surfaces against the guiding surfaces of said guiding column, whereby said shaft is wedged outwardly from said column pulling said sleeve more tightly around said column.
Dependencies are inferred from the claim text.