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:
Jan. 14, 2014
Filed:
Mar. 09, 2011
Yuta Tachibana, Toyokawa, JP;
Tomonobu Tamura, Toyokawa, JP;
Hiroyuki Watanabe, Toyokawa, JP;
Norihiko Nakano, Hoi-gun, JP;
Yuta Tachibana, Toyokawa, JP;
Tomonobu Tamura, Toyokawa, JP;
Hiroyuki Watanabe, Toyokawa, JP;
Norihiko Nakano, Hoi-gun, JP;
Konica Minolta Business Technologies, Inc., Tokyo, JP;
Abstract
An image forming apparatus includes: a stepping motor arranged in a conveying path for a paper; a driver for driving the stepping motor; a current detecting unit for detecting an actual current value; and a control unit for providing a set current value for every predetermined cycle. The control unit determines an estimated load torque value corresponding to the set current value in a previous cycle and the actual current value in a present cycle, by referring to a relationship between actual current and load torque of the stepping motor with respect to the set current value, determines a target load torque value based on the estimated load torque value, and determines, as the set current value, a current value corresponding to the target load torque value, by referring to a relationship between maximum output torque of the stepping motor and current supplied to the stepping motor.