Patent ID: 7661675

Claim:
An automatic document feeder for feeding a document, said automatic document feeder comprising: a sheet inlet; a sheet outlet; a pick up roller module disposed adjacent to said sheet inlet for picking up and separating the document; a driving roller module for transporting the document passing through a scanning window and transporting the scanned document to the sheet outlet, said driving roller module comprises a main driving roller and a feeding roller module, and said feeding roller module comprises an auxiliary belt and a feeding idle roller module, and said auxiliary belt encircles said feeding idle roller module, wherein said main driving roller is disposed between said pick up roller module and said scanning window; an ejecting idle roller module disposed adjacent to said sheet outlet for ejecting the document to said sheet outlet, said ejecting idle roller module comprises a first ejecting idle roller and a second ejecting idle roller; a single main belt encircling said main driving roller and said first ejecting idle roller, and when a sheet is transported into the automatic document feeder, said sheet is guided into a channel formed by said auxiliary belt and said main belt; and a tension idle roller module disposed pressing to the surface of said main belt for providing tension to said main belt.