Apparatus for paper tension control by measuring the frequency and flutter of a web
AssigneeChampion International Corporation
InventorHenry A. Wells
Life of this patent
Estimating the term…
Abstract
A noncontacting sensor means is mounted adjacent a portion of the paper path in a paper manufacturing apparatus. The sensor means detects flutter in a paper web travelling across the paper path. The tension in the paper web can be determined from the frequency and amplitude of the flutter. By adjusting the tension in the paper web to maintain the flutter within a predetermined range of frequency and amplitude, the tension in the paper web can be maintained at a desired level.
Claims7
In an apparatus for moving a material web along a path, said apparatus having a driven roller for moving the web along the path, a web tension controller composing:
- (a) first means spaced apart from the path of movement of the web, said first means being operable to project an energy beam onto a surface of the web along a line which is substantially perpendicular to the surface of the web, which energy beam is reflected by the web;
- (b) second means spaced apart from the path of movement of the web and disposed on the same side thereof as said first means, said second means being operable to detect the energy beam reflected by the web to provide an indication of the spatial position of the web to enable measurement of the frequency and amplitude of flutter of the web;
- and
- (c) control means operably connected to said second means for adjusting the tension of the web in response to variations in the spatial position of the web detected by said second means to maintain the frequency and amplitude of flutter of the web within a predetermined range.
Dependencies are inferred from the claim text.