发明授权
US5640231A Image forming apparatus and temperature control device for fixing unit for use therewith 失效
用于定影单元的图像形成装置和温度控制装置

Image forming apparatus and temperature control device for fixing unit
for use therewith
摘要:
There is disclosed an image forming apparatus having heating device having a heat generating resistor having a plurality of branches, conduction switching device for switching the conduction at the branch end of the heat generating resistor, and sensing device for sensing the paper size. The switching of conduction of the branch end is performed while not conducting to the heat generating resistor in accordance with the paper size sensed.
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