Method and apparatus for control of cross-track registration of a web member in an image forming apparatus, such as a photocopier or printer. A control patch is laid down on the web member and toned. After toning, the amount of toner for a particular section of the control patch is sensed and compared...http://www.google.ca/patents/US5300983?utm_source=gb-gplus-sharePatent US5300983 - Image shifting by control patch
