Image forming apparatus and abnormal temperature...

Details Image forming apparatus and abnormal temperature... Image forming apparatus and abnormal temperature...

2010-01-05

2011-11-01

Porta, David (Department: 2884)

Electrophotography

Diagnostics

Fixing

C399S069000

Reexamination Certificate

active

08050577

ABSTRACT:
An image forming apparatus and a controlling method thereof. The image forming apparatus includes a fixing member having a heating source to heat a developer of a recording medium, a power supply unit to the heating source, first and second temperature sensors for respective first and second positions on the fixing member, a width sensor for the recording medium, and a control unit, when a difference between the first temperature and the second temperature is greater than a predetermined reference value, determining whether the first temperature is abnormal based on the width of the recording medium and, when the first temperature is abnormal, interrupting the power supply to the heating source. An error in the temperature sensor is determined when a temperature difference between the first and second position of the fixing member is greater than a predetermined degree and the recording medium passes through both temperature sensors.

REFERENCES:
patent: 58129450 (1983-08-01), None
patent: 2001194948 (2001-07-01), None
patent: 2004126190 (2004-04-01), None
patent: 2008-15012 (2008-01-01), None

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