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:
Jul. 27, 2010
Filed:
Jun. 28, 2007
Hiroyuki Kakishima, Kawasaki, JP;
Shinya Sonoda, Yokohama, JP;
Hiroyuki Kakishima, Kawasaki, JP;
Shinya Sonoda, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
This invention relates to an apparatus and method capable of appropriately preventing a printing medium from being diagonally conveyed upon feed regardless of changes in printing medium feed conditions. In this invention, the maximum output value of a PWM signal is compared with the sum of a predetermined bias value and the PWM signal when a sensor detects the tip of a fed printing medium. If the sum is smaller than the maximum output value, it is monitored that the value of the PWM signal increases by the bias value. If the sum is equal to or larger than the maximum output value, it is monitored that the conveyance speed of the printing medium becomes smaller than a predetermined threshold value. Control is performed on the basis of the monitor results to stop driving a DC motor that supplies a driving force to rollers used for feed and conveyance.