Patent ID: 8240666

Claim:
A sheet feeder having a sheet-stopping function, the sheet feeder comprising: a rotating shaft, rotatable in a first direction and a second direction; a pick-up mechanism, for picking up a sheet, comprising a bracket mounted on the rotating shaft and a pick-up roller mounted on the bracket; a sheet-input roller, mounted on the rotating shaft, for feeding the sheet; and a sheet-stopping mechanism, driven independent of movement of the bracket by the rotating shaft, switching between a sheet-stopping state and a sheet-non-stopping state, the sheet-stopping mechanism comprising: a driving member, mounted on and rotated with the rotating shaft; a shutter, wherein the driving member actuates the shutter to advance and retract, and the shutter comprises: a first body, pivotally mounted on a pivot pin, interacting with the driving member; and a second body linked to one end of the first body, advancing and retracting as the driving member is rotated with the rotating shaft; and a torsion spring, pivotally mounted on the pivot pin and having one end fixed, providing a resilient force to the first body and facilitating returning the first body to the sheet-stopping state, wherein: the rotating shaft rotates in the first direction to enable the sheet-stopping mechanism to enter the sheet-non-stopping state in which the sheet is allowed to come into contact with the sheet-input roller; and the rotating shaft rotates in the second direction to enable the sheet-stopping mechanism to enter the sheet-stopping state in which a passage to the sheet-input roller is blocked up.