43967002TH Rev.1
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Oki Data CONFIDENTIAL
2. Theory of Operation
(6) Fix
The toner image that is transferred to paper is fused on the paper when heat and
pressure are applied while a paper passes through the contacting point between
the heat roller and the backup roller unit (the backup roller, the pad and the fuser
belt).
The
heat roller is heated by the internal halogen lamps of 800W and of 350W.
The backup roller is heated by the internal halogen lamp of 50 W. The fusing
temperature is controlled by the sum of the temperature that is detected by the
thermistor which is not contacting with the heat roller surface, and the temperature
that is detected by the thermistor which is contacting with the backup roller surface.
For safety purpose, thermostat is provide. If the heat roller temperature increases
higher than the specified temperature, the thermostat opens so that the voltage
supply to the heat is shut down. The backup roller unit is pressed against the heater
by the pressure springs on both sides.
(7)
Drum cleaning
The toner that is not used for fusing and remained on the OPC drum surface is
scraped off by the drum cleaning blade and is collected in the waste toner area of
toner cartridge.
Heat roller
Backup roller
Pad
Thermistor
Thermistor
Thermostat
Paper
Thermostat thermistor
Fuser belt
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ID unit
Waste toner area
Toner cartridge
Drum cleaning blade
(8) Belt cleaning
The toner that is remained on the transfer belt is scraped off by the belt cleaning
belt and collected in the waste toner box.
Belt waste toner box
Transport belt
Belt cleaning blade