PROCESS CONTROL PATCH WITH EXCEPTION COPY STOCK
Original Publication Date: 1990-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Xerox Disclosure Journal
In an electronic reprographic system, it is necessary to occasionally generate a process control patch on the photoconductive surface in order to detect process control problems associated with the xerographic system. Generally, such a patch is placed in the interdocument area on the photoconductive surface so as not to interfere with the normal output images. However, the use of exception stock, any stock greater than a predefined nominal width in the process direction, will result in the potential overlap of the latent output image and the test patch image on the photoconductor. Referring to the figure, photoconductive surface 10, having a process direction indicated by arrow 12, would generally have test patch 16 interposed between two adjacent latent image areas, 14 and 18. However, as illustrated to the right of latent image 18, which is illustrated as a tab stock output image, no room would be available for a test patch at location 20, without the possible overlap of the tab stock image 18 and the test patch.