A device for producing a track of perforations transverse to a paper web including a support for advancing the web past the device, a rotatable shaft at one side of the web, a perforating comb supported on and rotatable on the shaft when the shaft is rotated. A web support body on the opposite side of...http://www.google.de/patents/US5881622?utm_source=gb-gplus-sharePatent US5881622 - Device for perforating a running web
