Controlling web tension, and accumulating lengths of web, by...

B - Operations – Transporting – 65 – H

Patent

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Details

B65H 20/34 (2006.01)

Patent

CA 2462744

This invention pertains to processing continuous webs (18) such as paper, film, composites, and the like, in dynamic continuous processing operations. More particularly, it relates to accumulating limited lengths of such continuous webs (18) and to controlling tension in such continuous webs (18) during the processing operation. Both tension control and limited accumulations are achieved in a festoon system (110) by connecting a corresponding festoon (110) to actuator or the like, sensing variables such as position, tension, velocity, and acceleration parameters related to the web (18) and the festoon, and providing active force commands, in response to the sensed variables, to cause translational movement, generally including a target acceleration, in the upper festoon (110) rolls (124A, 124B, 124C) to control tension disturbances in the web (18) while providing limited accumulation of a length of the web (18). In some applications of the invention, the festoon (110) control system is used to attenuate tension disturbances. In other applications of the invention, the festoon (110) control system is used to create controlled tension disturbances.

L'invention concerne le traitement de bandes continues (18), telle que des bandes en papier, des pellicules, des composites, par exemple, dans des opérations dynamiques continues. Elle concerne, plus particulièrement, l'accumulation de longueurs limitées de ces bandes continues (18) et le contrôle de la tension dans lesdites bandes (18) pendant l'opération de traitement. La régulation de tension et les accumulations de longueurs limitées sont exécutées dans un système de feston (110) par accouplement d'un feston correspondant (110) à un organe de commande, détection de variables, telle que des paramètres de position, tension, vitesse et accélération concernant la bande (18) et le feston (110), et émission d'instructions actives en réponse aux variables détectées, de manière à déclencher une translation, incluant généralement une accélération ciblée, dans les rouleaux supérieurs (124A, 124B, 124C) du feston afin de contrôler les dérangements de tension dans la bande (18), tout en effectuant une accumulation limitée d'une longueur de cette bande (18). Dans quelques modes de réalisation de l'invention, on utilise ce système de contrôle du feston (110) afin d'atténuer les perturbations de tension. Dans d'autres modes de réalisation, on utilise ce système afin de créer des perturbations de tension contrôlées.

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