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:
Oct. 28, 1997
Filed:
Feb. 23, 1996
Hiroyuki Kiyoi, Kanagawa, JP;
Richoh Company, Ltd., Tokyo, JP;
Abstract
In a fixing system used to an electrophotographic recording apparatus, when a fixing roller is heated to a temperature above a preset fixing temperature by a heater and then a thermistor senses that the surface temperature of the fixing roller falls below the fixing temperature, a heater controller energizes the heater for a predetermined driving time and then deenergizes of the heater for a predetermined heater interrupting time to thereby control the surface temperature of the fixing roller. The heater driving time and the heater interrupting time may be stored in a memory region in accordance with respective sizes of recording papers. The duty ratio of the heater may be changed when a predetermined number of images have been recorded or when the fixing system is continuously operated for longer than a predetermined time.