Method and apparatus for measuring a position of webs or sheets

Details Method and apparatus for measuring a position of webs or sheets Method and apparatus for measuring a position of webs or sheets

1995-12-11

1998-03-03

Font, Frank G.

Optics: measuring and testing

By monitoring of webs or thread

25055912, 25055936, G01N 2184

Patent

active

057241503

ABSTRACT:
The position of the edges of a web or sheet is determined by using an optical system in conjunction with a photoelectric receiver. The location of the sheet or web edge can be measured accurately even if the edge has various anomalies. The optical system provides different images of the web or sheet edge in two directions.

REFERENCES:
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

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