Patent ID: 7591461

Claim:
An automatic document feeder, comprising: a paper tray, which comprises a bottom plate on which a sheet is placed, and a stopper for stopping a leading edge of the sheet; a pick-up roller, which is movable and rotatable, for picking up the sheet to enable the leading edge of the sheet to pass over the stopper; and a sheet-lifting mechanism, which is elastic and is disposed in the paper tray, for applying an upward lifting force to the sheet placed on the bottom plate, wherein the sheet-lifting mechanism comprises: a first elastic piece having a first end disposed on the bottom plate, a free second end, and a middle portion connecting the first end to the second end, wherein the middle portion is bendable towards the first end, and the second end is bendable towards the middle portion and movable within a recess of the bottom plate; and a second elastic piece having a first end disposed on the stopper and a second end in sliding contact with the bottom plate.