Patent ID: 8333374

Claim:
A paper-feeding mechanism for a printing apparatus comprising: a delay engaging member comprising a first gear and a first coupling member installed on the first gear; the first coupling member is adapted to rotate relative to the first gear; and an unidirectional engaging member comprising a third gear installed on the first coupling member; wherein when the printing apparatus works normally, the first gear rotates along a first direction, and the first coupling member and the third gear rotate along the first direction together with the first gear to transmit a paper in a second direction which is opposite to the first direction; when the paper is jammed in the printing apparatus, the first gear rotates along the second direction, until the first gear abuts the first coupling member in the second direction; and the paper jammed in the printing apparatus is pulled along the first direction, the third gear and the first coupling member rotate along the second direction to avoid the first gear rotating together with the first coupling member until the paper jammed in the printing apparatus is pulled out.