Patents Examined by Daviid H Bollinger
  • Automatic document feeder
    Patent number: 8136811
    Abstract: An automatic document feeder includes a paper guide casing, a photo interrupter, a first sensing unit, a second sensing unit and a controller. During the paper is transported through the paper guide casing, the first sensing unit and the second sensing unit are respectively triggered by two ends of the paper. Consequently, the photo interrupter is conducted for a first duration T1 or a second duration T2. According to the first duration T1 or the second duration T2, a skew angle of the paper is calculated by the controller.
    Type: Grant
    Filed: January 27, 2011
    Date of Patent: March 20, 2012
    Assignee: Primax Electronics Ltd.
    Inventors: Ping-Hung Kuo, Wei-Hsun Hsu, Szu-Chieh Wu