Length measuring during rolling up of thin material

Details Length measuring during rolling up of thin material Length measuring during rolling up of thin material

G - Physics

01

B

33/178, 354/25

G01B 7/04 (2006.01) G06F 15/46 (1985.01)

Patent

CA 1207450

- 14 - ABSTRACT OF THE DISCLOSURE A device for measuring the rolled-up length of web forming a roll when a web break has occurred during forma- tion of the roll employs a web break indicator to indicate a web break. Normal web length measuring is carried out by counting pulses from a pulse transducer driven by a roller turned by the moving web and this is stopped on web break. A calculation of the circumference of the web roll on the occasion of the web break is made with the further aid of a pulse transducer on the shaft of the web roll and a counter and logic unit. Too loosely wound web material is removed from the roll and the cir- cumference of the roller decreases. After joining the web and renewed winding, a calculation of the roll circum- ference is continuously performed by means of the pulse transducers. When the circumference of the roll resumes the size it had at the moment the web break occurred, normal length measuring is automatically resumed.

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