The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 20, 2012
Filed:
Jan. 27, 2011
Applicants:
Ping-hung Kuo, Taipei, TW;
Wei-hsun Hsu, Taipei, TW;
Szu-chieh Wu, Taipei, TW;
Inventors:
Assignee:
Primax Electronics Ltd., Taipei, TW;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B65H 7/02 (2006.01);
U.S. Cl.
CPC ...
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 Tor a second duration T. According to the first duration Tor the second duration T, a skew angle of the paper is calculated by the controller.