G - Physics – 05 – D
Patent
G - Physics
05
D
341/41, 88/72
G05D 3/10 (2006.01) G03B 21/11 (2006.01) G06K 17/00 (2006.01)
Patent
CA 1063211
ABSTRACT In a microfilm web handling apparatus wherein a photocell senses position markers corresponding to image frames along the microfilm web to enable positioning of a given image frame within a viewing station, a reference photocell provides a reference signal which is compared with a detected signal from the position sensing photo- cell to produce a position signal which is processed via logic networks to drive a film transport mechanism to thereby selectively position the microfilm web. Pre- rerably, three photocells are provided, two of which sense position markers adjacent one edge of the microfilm web, while the third provides the reference signal. Each photo- cell has an effective sensing diameter which is not greater than one-half the dimension of a position marker parallel to the direction of travel of the web. In such an embodi- ment, the output of the reference photocell is compared with the detected signal from each of the two position indicating photocells. The apparatus further preferably includes a transverse motion carriage to enable image frames located within either or two parallel tracks along the length of the microfilm web to be selectively positioned within a viewing station. The transverse motion carriage and the direction of web transport are automatically controlled in response to appropriate input signals.
239996
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