DOCUMENT SIZE SENSING
Original Publication Date: 1990-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Xerox Disclosure Journal
In an electronic reprographic system having a document handling subsystem attached thereto, it is desirable to determine the size of input document sheets being fed to the imaging platen. The above figure illustrates a simplified plan view of imaging platen 20 of such a system. More specifically, the system is capable of determining the size of the input document from a set of four paper sensors (S&&,R) placed in the path of input document 22 at a point just prior to the imaging platen. The document handler for such a system may be capable of recirculating documents from a stack of sheets placed therein, feeding single documents from a side document feed position, or feeding computer fan-fold sheets across imaging platen 20. More importantly, the document handling subsystem is capable of providing document size feedback to a reprographic system controller which may ultimately use the information for detection of user programming errors. For example, a mismatch between the programmed document size and the actual document size may be detected.