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:
Apr. 19, 2005
Filed:
Mar. 24, 2003
Michael Chen, Hsin Chu, TW;
Chi-yao Chen, Hsin Chu, TW;
Michael Chen, Hsin Chu, TW;
Chi-Yao Chen, Hsin Chu, TW;
Avision Inc., Hsinchu, TW;
Abstract
A sheet feeder capable of immediately detecting a paper jam includes a housing, a motor attached to the housing, a driving roller, a driven roller, a rotation speed detector and a control circuit. The motor drives the driving roller to rotate, and the driving roller drives the driven roller to rotate. The driven roller cooperates with the driving roller to feed a sheet therethrough. The rotation speed detector detects the rotation speed of the driven roller and outputs a rotation speed signal. The control circuit receives the rotation speed signal to judge whether or not a paper jam occurs according to the rotation speed signal.