Photocopying – Projection printing and copying cameras – Step and repeat
Patent
1975-06-13
1977-04-05
Wintercorn, Richard A.
Photocopying
Projection printing and copying cameras
Step and repeat
74567, 353 27R, 354195, 355 58, G03B 2742
Patent
active
040159019
ABSTRACT:
A positioning mechanism primarily but not exclusively for positioning a microfiche film held in a movable frame relative to a camera lens or to pick-up, transfer, titling and release stations where a high degree of accuracy is required, comprising one or more camways formed helically around a cylindrical roller, a cam follower on the frame engaging one of the camways which frame is then driven to a location on the camway by rotating the roller, at the location a depression in the camway formed either as a hole or ramp acts as a stop for the follower, the stopping surface of the depression is provided along the length of the camway so that if the follower which is in contact with both sides of the camway or the camway itself becomes worn at the sides the location position is not subjected to wear and the accuracy of the location of the follower in the depression is not affected. Several microfiche standards can be accommodated on one roller by the provision of several camway grooves and the follower can be made to more rapidly form one standard to another by linking the camways and/or by lifting the follower from one groove to another.
REFERENCES:
patent: 2506347 (1950-05-01), Davis
patent: 3208338 (1965-09-01), Davis
patent: 3628865 (1971-12-01), Spence-Bate
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