Web tension control method and apparatus

Details Web tension control method and apparatus Web tension control method and apparatus

B - Operations, Transporting

65

H

242/9

B65H 59/00 (2006.01) B65H 19/14 (2006.01) B65H 23/16 (2006.01)

Patent

CA 1160610

ABSTRACT OF THE DISCLOSURE This invention provides an improved method and apparatus for controlling the tension in a tensionally fragile web of material being pulled by a constant speed processing machine from either one of a pair of supply rolls. A first festooning roller effects the control of the web tension during the normal operation of the machine. During the splicing of the web from one supply roll to another, the tension in the web would tend to dramatically in- crease. This tendency is offset by a second festooning roller engagable with the web and shiftable in a web tension decreasing direction only upon the occurrence of web tensions substantially in excess of the normal tension range. Means are provided to restrict the rate of return movement of the second festooning rol- ler to that which falls within the control limits of the first festooning roller, thus eliminating any tendency to accelerate the new supply roll to a speed above the desired machine operating speed.

386322

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