A plurality of print hammers disposed along a print station are caused to be swung against a print band and there is provided a top edge guide to limit upward movement of the band and maintain the print band in a precise path in its travel past the print station. The print band is trained around pulleys...http://www.google.fr/patents/US4211166?utm_source=gb-gplus-shareBrevet US4211166 - Print band one edge guide
