Method and device for measuring the diameter of a roll of web material
AssigneeFabio Perini S.p.A.
InventorGuglielmo Biagiotti
Life of this patent
Estimating the term…
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 (α) 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 (α) and the radius (R) of the supporting roller (5).
Claims23
Method for measuring a diameter of a roll of wound web material comprising rotating said roll of wound web material;
- detecting at least twice a moment when a given point on the web material passes a predetermined position;
- and calculating the diameter of the roll from at least one parameter of said rotation.
Device for measuring a diameter of a roll of wound web material comprising
- means for rotating said roll in a winding direction;
- a sensor means for detecting a moment when a given point on said web material passes a predefined position;
- and
- control means that calculates the diameter of said roll from a parameter relating to rotation of said roll between two successive passes of said given point through said predefined position.
Gluing device for gluing tail ends of a series of rolls of wound web material comprising means programmed to carry out, on at least some of said rolls, two consecutive positionings of a same roll and, measuring a parameter relating to rotation of each roll between said two consecutive positionings, and calculating a diameter of the roll so positioned based thereon.
Dependencies are inferred from the claim text.