FIRST PASS MULTIFEED DETECTION IN A DOCUMENT HANDLER
Original Publication Date: 1994-Aug-31
Included in the Prior Art Database: 2004-Apr-07
Xerox Disclosure Journal
An apparatus and method for detecting a first pass multifeed error in a recirculating document handler is disclosed. A multifeed error is defined as feeding more than one original image bearing sheet to an imaging station in an automatic or recirculating document handler (RDH), and the like, of an electronic printing or copying machine. The apparatus is comprised of an electromagnetic brake located inside an imaging platen exit idler roller shaft which stops the roller momentarily, for example about 20 to 30 milliseconds, thereby allowing multifeeds to separate and causes the width of a sheet, as measured by sensors, to appear greater than expected and subsequently stops the document handler.