COMPUTER FORM FEED CONTROL ALGORITHM
Original Publication Date: 1990-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Xerox Disclosure Journal
Computer Form Feed (CFF) document handling in electrophotographic printing machines is typically controlled by feeding paper while monitoring the sprocket holes at the edge of computer form sheet for example, as disclosed in US. Patent 4,485,949. A CFF control algorithm should function with realistic sprocket hole dimensional error tolerances and be capable of recovering from at least three adjacent defective sprocket holes. A commonly encountered problem in frictional paper feed systems is the inertia of the CFF web which may lead to slippage between the form paper and the drive rolls resulting in poor registration and hole sensor faults. The problem is solved by ramping the drive roll initial feed velocity. The slow controlled acceleration of the first sheet reduces the frictional demands on the drive rolls, minimizes misregistration between the form paper and sprocket hole sensors, and reduces paper fault interrupts.