Method and apparatus for measuring a position of a web or sheet

Details Method and apparatus for measuring a position of a web or sheet Method and apparatus for measuring a position of a web or sheet

1995-12-11

1998-06-09

Font, Frank G.

Optics: measuring and testing

By monitoring of webs or thread

25055912, 25055936, G01N 2184

Patent

active

057643679

ABSTRACT:
The position of an edge of a sheet or web of material is measured by use of a beam of light passing through an opening in a diaphragm and being focused on a sensor. Anomalies on the edge of a sheet or web are prevented from providing incorrect information by proper selection of the size of the diaphragm opening.

REFERENCES:
patent: 3495089 (1970-02-01), Brown
patent: 3696249 (1972-10-01), Bowker
patent: 3843264 (1974-10-01), Josse et al.
patent: 3989387 (1976-11-01), Hategan
patent: 4004153 (1977-01-01), Obser et al.
patent: 5471066 (1995-11-01), Hagiwara
"Patent Abstacts of Japan"; No. JP58062504; Published Apr. 1983; vol. 7, No. 50.
Siemens-Zeitschrift "Seitenkantenregelung Laufender Warenbahnen" Von Henning Schneider; May 1972; pp. 349-352.

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