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. 19, 1994
Filed:
Jul. 09, 1992
Yasumasa Otsuka, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In an image forming apparatus including a fixing device for heating and fixing a toner image on a recording material, a temperature detector for detecting the temperature of the surface of a fixing roller is provided substantially outside a passing region of the recording material on the fixing roller. The temperature at a central portion of the surface of the fixing roller is always maintained at a fixing temperature which is most suitable, irrespective of the width size of the recording material to be fixed. Furthermore, when sheets of recording material are continuously fed and fixed, the temperature at an end portion of the fixing roller, provided with the temperature detector is changed in accordance with the number of sheets to maintain the central portion of the fixing roller always at a temperature which is most suitable. Thus, it is possible always to perform image formation having an excellent quality.