Patent ID: 7819393
Filing Date: 2010-10-26
Classification: B65H

Abstract:
1. A method for controlling a web in a web cutter, the web cutter having a cutter module for cutting the web into sheets, a first web driver for moving the web from a web supply and a second web driver downstream from the first web driver for feeding the web to the cutter module, said method comprising: driving the first web driver for achieving a first web velocity having a first velocity profile; driving the second web driver for achieving a second web velocity having a second velocity profile, wherein the second velocity profile is different from the first velocity profile so as to allow a web loop to form between the first web driver and the second web driver, the web loop having a variable loop size between a minimum loop size and a maximum loop size; controlling at least the first web driver such that, at least in a portion of web cutter operation, the first web velocity increases when the web loop size decreases until the web loop size reaches the minimum loop size, and the first web velocity decreases when the web loop size increases until the web size reaches the maximum loop size, wherein controlling at least the first web driver comprises calculating a desired web velocity at each sample interval of the web loop to achieve the first web velocity.