Continuous Web Servo System
Original Publication Date: 1989-Mar-01
Included in the Prior Art Database: 2005-Jan-27
The lateral position of a continuous web traveling over a number of rolls is controlled via a closed-loop, electromechanical servo system. This closed-loop system permits the mechanical tolerances on the web and host system to be increased and also results in extended web life because mechanical edge guiding is eliminated. Web wandering approaches zero due to the fine resolution of the stepper motor actuator. Referring to the figure, web 3 is suspended between two rollers and travels in the longitudinal direction depicted by the arrow labeled "V". Roller 1 is fixed in space and is driven by an external means (not shown) to impart longitudinal motion to the web. Roller 2 is the control means that results in controlling and maintaining the lateral position of the web.