System for measuring the repeat length of a moving web
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United States of America Patent
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Aug 14, 1990
Grant Date -
N/A
app pub date -
Oct 6, 1989
filing date -
Oct 6, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for measuring the repeat length (L) of a moving web includes forming a plurality of detectable marks along the length of the web at a repeated length interval. First and second detectors positioned along the web path are separated by a known distance (S). The repeat length of the web is obtained by detecting a mark moving past the first detector and then detecting a mark moving past the second detector, determining the time (t) separating the detections, and measuring the speed of the moving web (V), wherein the repeat length is calculated using the formula L=S+Vt.
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