Patent ID: 6499639
Filing Date: 2002-12-31
Classification: B65H,G05B

Abstract:
A method for dynamically controlling a web printing press having a nip roller and a driver of the nip roller, the method comprising:controlling a speed of the driver in a tension-control mode during a first phase of printing press operation, the controlling of the speed of the driver in the tension-control mode being a function of a tension in a web upstream of the nip roller so as to maintain the tension at a first desired tension value, the web moving continuously through the printing press during the tension-control mode; and controlling the speed of the driver in a velocity-control mode during a second phase of printing press operation, the controlling of the speed of the driver in the velocity-control mode being a function of a driver velocity ratio, the driver velocity ratio being a ratio of the speed of the driver for producing a second desired tension value with respect to a command speed of the printing press.