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. 12, 2016
Filed:
May. 02, 2011
Kenji Fukushi, Kashiwa, JP;
Kenji Fukushi, Kashiwa, JP;
CANON KABUSHIKI KAISHA, , JP;
Abstract
A fixing device capable of easily detecting a wrap jam of a recording sheet without increasing costs. A fixing roller fixes a toner image on a recording medium under heating control. A central thermistor and an end thermistor detect first and second temperatures of the fixing roller in respective sheet-passing and non-sheet-passing areas. A first temperature difference-detecting circuit compares a temperature difference between the first and second detected temperatures and a first threshold and outputs a first comparison result. A second temperature difference-detecting circuit compares the temperature difference and a second threshold larger than the first threshold and outputs a second comparison result. A switching circuit selects one of the first or second comparison results according to a switching signal from a CPU, and the CPU controls heating of the fixing roller based on the selected comparison result.