Patent Number: 6,168,679

Title: Method and device for measuring the diameter of a roll of web material

Abstract: The method for measuring the diameter of a reel or roll of wound web material (N) involves the following steps: rotating said reel (L); detecting at least twice the moment when a given point (Lf) on the web material (N) passes a predetermined position; determining the time that elapses between said two passes or the amount of rotation (.alpha.) of the supporting roller (5); and calculating the diameter (D) of the reel (L) from said time (T) and the peripheral speed (V) of the reel (L) of from said amount of rotation (.alpha.) and the radius (R) of the supporting roller (5).

Inventors: Biagiotti; Guglielmo (Lucca, IT)

Assignee: Fabio Perini S.p.A.

International Classification: B65H 19/29 (20060101); B65H 19/22 (20060101); B65H 18/00 (20060101); G01B 21/10 (20060101); G01B 21/12 (20060101); B32B 031/20 ()

Expiration Date: 01/02/2018