Automatic film retrieval system and method therefor

Details Automatic film retrieval system and method therefor Automatic film retrieval system and method therefor

1975-03-19

1977-04-05

Thesz, Joseph M.

Registers

Platform operated

Platform actuated traffic counters

235 92CA, 235 92R, 353 26A, G03B 2312, G06M 314

Patent

active

040164063

ABSTRACT:
A first counter stores the number of a desired microfilm frame to be located at an access position. A second counter stores the number of the present frame at the access position. The microfilm is normally driven at a high speed, but it is desired to drive the microfilm at a lower speed for a predetermined number of frames prior to the arrival of the desired frame at the access position. This predetermined number is set into a compensating circuit. A comparator first determines the magnitude and sense of the difference between the two counters while the film is stationary. The predetermined number is then added to the contents of the second counter, and the film is driven until the comparator detects a first equality of the contents of the first and second counter, thereby switching the film drive to the lower speed. The predetermined number is then algebriacally added to the contents of the second counter in the opposite sense, so that, when the desired frame reaches the access position, the comparator detects a second equality of the contents of the first and second counter, thereby stopping the film drive.

REFERENCES:
patent: 3612976 (1971-10-01), Tripp
patent: 3708677 (1973-01-01), Volk et al.
patent: 3731177 (1973-05-01), Commander et al.
patent: 3852719 (1974-12-01), Hideo Nishumura et al.

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