System for measuring the repeat length of a moving web

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

1989-10-06

1990-08-14

Cuchlinski, Jr., William A.

Measuring and testing

Sheet, woven fabric or fiber

364562, 226 28, 226 27, G01B 1104

Patent

active

049476858

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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patent: 4839674 (1989-06-01), Hanagata et al.

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