2. Product Specifications and Description
2.6. Fuser unit
This section describes the fuser unit structure and the image fusing process.
2.6.1. Fuser unit overview
The fuser unit fuses the toner that was transferred by the transfer roller onto the paper, by applying heat and pressure to
complete fusing process.
1)
Halogen Lamp
The fuser unit has two halogen lamps. One heats the center of the heat roller, the other heats the end of axial direction.
These halogen lamps are lit alternately to heat the heat roller. Each lamp has its coil in a different location. The coil
of the center heater lamp is in the center, those of the side heater lamp are on both sides. The lamps are fixed inside
of the heat roller. When rotating the heat roller, these lamps does not rotate.
2)
Heat Roller
The heat roller is made by the aluminum and gets heat from the halogen lamp and transfer it to toner and paper. To
prevent the heat roller from adhering to the toner, its surface includes the fluoridation. And to keep the proper nip width
between the pressure roller and heat roller, the pressure roller Assy pushes the heat roller by using the spring.
3)
Pressure Roller
The pressure roller is a silicon rubber roller which ensures proper nip width between the pressure roller and heat roller.
4)
NC sensor
NC sensor (non-contact type thermistor), located near the center of the heat roller, controls the temperature.
5)
Thermostat
Thermostats cut off the power supply to the halogen lamp by opening the circuit when the heat roller becomes
abnormally hot as a result of problems such as NC sensor malfunction. These thermostats are used to prevent abnormal
operation. When the thermostat is triggered, it must be replaced (as well as the other damaged parts in the fuser unit).
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