An apparatus for aligning a longitudinal edge of a flexible and continuously longitudinally moving web has a support having a longitudinally nondisplaceable face extending transversely across and immediately adjacent the edge and an alignment element having a plurality of parallel and elongated formations...http://www.google.es/patents/US20020014508?utm_source=gb-gplus-sharePatente US20020014508 - System for aligning an edge of a moving web
