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:
Nov. 05, 2013
Filed:
Sep. 02, 2011
Isao Iwai, Saitama, JP;
Isao Iwai, Saitama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A carriage is precisely controlled in short-distance movement. The carriage is controlled upon printing by an inkjet printhead by reciprocally moving the carriage to which the printhead is mounted along a guide rail by a driving force supplied from a carriage motor. More specifically, a carriage position in the reciprocal direction is detected, and a carriage speed is calculated based on the detected positions. Then, the positions and carriage speed are fed back to control drive of the carriage motor. In the feedback-control, a loss due to friction generated between the carriage and the guide rail is compensated for with respect to a motor instruction value used to control drive of the carriage motor. The compensation is performed by identifying, based on the carriage speed, whether the friction is static or kinetic, and determining a compensation value in accordance with the identification.