Fixing device with improved heat control for use i

专利名称：Fixing device with improved heat control for

use in an image forming apparatus

发明人：Satoshi Kinouchi,Osamu Takagi申请号：US09666786申请日：20000921公开号：US038335B1公开日：20020820

专利附图：

摘要：The fixing device fixes toner to a paper by a nip between a heating roller and apress roller which are opposed to each other. An exciting coil is provided inside theheating roller. Temperature detection mechanisms are provided at least two positions on

the outer circumferential surface of the heating roller, between the exciting coil and ametal layer of the heating roller, or on the inner circumference of the exciting coil. Twoof the temperature detection mechanisms are respectively provided at a center part andan end part in the lengthwise direction of the heating roller, with a predetermined angleinserted therebetween on the circumference of the metal layer of the heating roller. Adata table is provided to detect the temperature of a wire material forming the excitingcoil, from an extent of a temperature increase while the exciting coil is electricallyconducted or an extent of a temperature decrease after the electric conduction to theexciting coil is stopped. The temperature increase and the temperature decrease aredetected by each of the temperature detection mechanisms. If either the temperatureincrease or the temperature decrease deviates from a definition value held in the datatable, the current electrically conducted to the exciting coil is shut off.

申请人：TOSHIBA TEC KABUSHIKI KAISHA

代理机构：Foley & Lardner

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