System for measuring the relaxed length of a moving web

Details System for measuring the relaxed length of a moving web System for measuring the relaxed length of a moving web

G - Physics

01

B

G01B 11/04 (2006.01) B42C 3/00 (2006.01) B65H 16/02 (2006.01) G01B 21/06 (2006.01)

Patent

CA 2042045

2042045 9105219 PCTABS00004 Method and apparatus for measuring the repeat length (L) of a moving web (20) includes forming a plurality of detectable marks (80) along the length of the web (20) at a repeated length interval. First (70) and second (72) detectors positioned along the web path are separated by known distance (S). The repeat length (L) of the web is obtained by detecting a mark (80) moving past the first detector (70) and then detecting the next mark (80) moving past the second detector (72), determining the time (t) separating the detections, and measuring the speed (V) of the moving web (20), wherein the repeat length (L) is calculated using the formula L=S+Vt.

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