Patent ID: 8174735

Claim:
A document processing system, comprising: a photoreceptor that continuously moves along a closed path; a plurality of raster output scanners (ROSs) located along the closed path of the photoreceptor, the ROSs individually operable to generate a latent image on a portion of the photoreceptor based on a clock input; a first clock providing a first clock output signal to the ROSs; a second clock providing a second clock output signal to the ROSs; a plurality of developers individually located downstream of a corresponding one of the ROSs and individually operable to develop toner of a given color on the latent image on the photoreceptor; a transfer station operative to transfer the developed toner to a substrate traveling along a first substrate path; a fusing station for fixing the transferred toner to the substrate; a duplex router receiving the substrate from the fusing station and operative to selectively direct the substrate along a second path; a media inverter located along the second path and operative to invert the substrate and to return the inverted substrate to the first path upstream of the transfer station; and a controller coupled with the ROSs to selectively operate a given ROS according to the first clock signal if the latent image being generated by the given ROS is to be fixed to a first side of the substrate or according to the second clock signal if the latent image being generated by the given ROS is to be fixed to a second side of the substrate; wherein the photoreceptor includes a plurality of image panel zones in which the ROSs generate latent images, with successive panel zones separated by inter panel zones, wherein the controller provides the ROSs with a control parameter indicating whether a latent image to be generated on an upcoming panel zone is to be fixed to a first side or a second side of the substrate, and wherein the ROSs individually select one of the clock output signals for use in generating a latent image on the upcoming panel zone based on the control parameter.