Method of measuring the velocity and/or length of endless webs of textile material and apparatus for carrying out the method
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United States of America Patent
Stats
-
Nov 12, 1991
Grant Date -
N/A
app pub date -
Jan 16, 1989
filing date -
Mar 18, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and an apparatus for measuring the velocity and/or length of endless webs of textile goods are described. The textile web is irradiated with a light beam of which one deflects a first portion prior to impinging on the surface of the textile web and one directs the deflected light beam to evaluation means. The light beams reflected from the surface of the textile web are directed through a convex lens and are also directed to the evaluation means so that the corresponding light beams are superimposed. The velocity and/or the length of the web of textile goods are determined from the frequency of the interference formed by the superposition of the light beams.
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