Patent ID: 6307614
Filing Date: 2001-10-23
Classification: B65H,G03G,H04N

Abstract:
A method of feeding and duplex scanning a document in a document scanning device comprising the steps of:a) transporting individual sheets of said document from a stack thereof to a scan region of a scanning system;b) scanning a first face side of said document sheet at said scan region;c) transporting said sheet from said scan region to a pair of opposed document exit transport rollers;d) gripping opposite face sides of said sheet in a nip between said exit transport rollers and rotating said exit transport rollers in an exit direction to pull said sheet therebetween in an exit direction to move a trailing edge of said sheet away from said scan region;e) reversing the direction of rotation of said exit transport rollers before said trailing edge of said sheet passes therebetween to feed said sheet to said scan region in face inverted orientation for scanning a second face side of said document sheet;f) scanning a leading portion of said second face side of said sheet and transporting a leading edge of said sheet to said nip between said exit transport rollers before a trailing edge of said sheet passes said nip in a feed direction to cause buckle formation in said sheet between said nip and said scan region;g) again reversing the direction of rotation of said exit transport rollers to rotate said exit transport rollers in said exit direction to consume sheet buckle in said nip without causing differential slippage of adjacent leading and trailing portions of said sheet in said nip;h) continuing to rotate a driven one of said exit transport rollers in said exit direction to pull a trailing portion of said sheet to said scan region and scanning said trailing portion of said second side of said sheet while permitting said trailing portion of said sheet to slip past a leading portion of said sheet in said nip; andi) rotating said exit transport rollers in said exit direction to eject said sheet from between said transport rollers.