Patent ID: 8231122

Claim:
A paper-stopping mechanism of an automatic document feeder, said automatic document feeder having a paper pick-up arm for feeding a paper, said paper-stopping mechanism comprising: an upper cover, wherein said paper pick-up arm is disposed on said upper cover; an auxiliary gear disposed on said paper pick-up arm, wherein during said paper pick-up arm is moved upwardly to a standby position, said auxiliary gear is rotated in a first direction, wherein during said paper pick-up arm is moved downwardly to a paper pick-up position, said auxiliary gear is rotated in a second direction; a paper-stopping arm pivotally coupled with said upper cover wherein said paper-stopping arm further comprises an elongated slot and a paper-stopping slice, wherein said transverse rod is penetrated through said elongated slot; and a traction member disposed on said upper cover, wherein said traction member is stayed in a first position when said paper pick-up arm is in said standby position, wherein said traction member comprises: a rack engaged with said auxiliary gear, wherein upon rotation of said auxiliary gear in said first direction, said traction member is moved to said first position, wherein upon rotation of said auxiliary gear in said second direction, said traction member is moved to a second position; and a transverse rod, wherein when said traction member is in said first position, said transverse rod is sustained against said paper-stopping arm, so that said paper-stopping arm is stayed in a paper-stopping position, wherein when traction member is in said second position, said paper-stopping arm is raised by said transverse rod, so that said paper-stopping arm is detached from said paper-stopping position.