Browse Prior Art Database

Original Publication Date: 1994-Dec-31
Included in the Prior Art Database: 2004-Apr-07

Publishing Venue

Xerox Disclosure Journal


Image registration in an electronic printer is accomplished by detecting the side or lead edge of the copy media and registering an electronic image so that it is exposed, developed and transferred to the media at a desired registered position. Registration is typically accomplished by using detecting means such as an imaging device 4 shown in Figure 1 in a printing system generally indicated by the numeral 6. System 6 includes an exposure station 8 where a Raster Output Scanner (ROS) 10 exposes the surface of a photoreceptor drum 12 with scan lines modulated in response to image input signals to the ROS. The latent image formed on the photoreceptor surface is developed at a conventional developer station and the developed image transferred to a copy media fed from a media tray 14. A copy sheet 16 is shown being fed from the tray by roller pair 18 along the top surface of a transport belt 19. Imaging device 4 detects the leading edge of sheet 16 and generates output signals which are processed and are fed back to the ROS as correction signals to control the image exposure as described in further detail below. The transferred image is fixed at fuser 22 and conveyed to a catch tray 24. The photoreceptor surface is cleaned and recharged by conventional means.