"Anti-wander" web-transport arrangements wherein web-means are intermittently advanced, while being monitored for misalignment along the transport-path, and also being automatically urged back into proper alignment along this path. Preferably, this is done with left and right roll means, one of which...http://www.google.fr/patents/US5021673?utm_source=gb-gplus-shareBrevet US5021673 - Web transport with anti-skew arrangement
