Patent ID: 8303071
Filing Date: 2012-11-06
Classification: G03G

Abstract:
1. A method for controlling marking stations in a tandem printing system having two printers comprising: operating at least one marking station in a first printer with reference to a low frequency component and a high frequency of a velocity measurement for a web moving along a web path in the first printer, the velocity measurement for the web in the first printer corresponding to an angular velocity signal obtained from at least one roller in the web path of the first printer; printing fiducial marks on the web with the at least one marking station in the first printer; detecting the fiducial marks on the web with a fiducial mark sensor in a second printer after the web exits the first printer; generating a velocity measurement for the web as the web moves along a web path in the second printer that corresponds with the detected fiducial marks; and operating at least one other marking station in the second printer with reference to a low frequency component and a high frequency component of the velocity measurement of the web moving along the web path in the second printer, the high frequency component of the velocity measurement for the web in the second printer corresponding to an angular velocity signal obtained from at least one roller in the web path of the second printer.