Patent ID: 7370858

Claim:
An apparatus for preventing paper double feeding in a paper feeding unit of a printer having a frame, a pickup roller which picks up sheets of paper stacked on a paper cassette and transfers the paper into the printer, and a plurality of paper guides which are installed at a front portion of the paper cassette and guide the paper transferred by the pickup roller, the apparatus comprising: a stripper which is installed to be inclined at a predetermined angle with respect to the paper stacked on the paper cassette, and attached to at least one front side of each of the paper guides; a lever which is installed at a side of the stripper and has a contact surface to contact the paper transferred by the pickup roller; and a lever shaking unit which shakes the lever to intermittently contact a side of the paper transferred by the pickup roller, the lever shaking unit comprising a lever shaft installed on the frame, the lever being connected to the lever shaft, a shaking plate extending from the lever shaft, and a shaker installed on the frame and intermittently shaking the shaking plate to shake the lever; wherein a friction force is intermittently applied to the side of the paper by the lever, such that double feeding of the paper is prevented and the stripper comprises an opening groove formed on an upper portion of the stripper such that the contact surface of the lever contacts the side of the paper through the opening groove.