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AR-651/810 FUSER UNIT 14 - 2
14. 3. Functions
(1) IH coil (IH: Induction heating)
The IH coil is inside the fuser roller and applies the induction heat to the fuser roller. This IH coil is
divided into two parts, the center IH coil heating the center of the fuser roller and the side IH coil
heating both ends of the fuser roller. Those parts become ON/OFF separately to always keep the fuser
roller at a certain temperature without wasting excessive electric power.
(2) Fuser roller
The fuser roller is made of iron and induction-heated by the IH coil. It is pressed by the pressure roller,
which is mentioned below, and the toner is fused on the peper while the paper is passing through
between these two rollers with the toner image on the paper facing the fuser roller. So, the toner soaks
into the fibers of the paper by melting it with the heat of the fuser roller and improving the heat conductivity
by the pressure from the pressure roller.
The surface of the fuser roller is coated with plastic to prevent the toner adhering to the roller (the
phenomenon called “offset”) and help it separate from the fuser roller.
(3) Pressure roller
The pressure roller is made of rubber to make it easier to press the fuser roller and always pressed by
a spring force.
(4) Separation fingers
The separation fingers take off the paper that has stuck to the fuser and pressure rollers.
(5) Cleaning web
The cleaning web is attached in touch with the fuser roller by the web pushing roller to remove the toner
and paper dust that have stuck to the fuser roller during the fusing process. It is rolled up by the motor
so that its clean surface always touches the fuser roller, and also it contains silicon oil for coating the
surface of the fuser roller, which makes it easier to clean up the toner and paper dust on the fuser roller.
(6) Cleaning rollers
The cleaning rollers are attached in touch with the pressure roller to remove the toner and paper dust
that have stuck to the pressure roller during the fusing process. There are two kinds of rollers, a metal
roller and felt roller. The felt cleaning roller contains silicon oil for coating the surface of the pressure
roller, which makes it easier to clean up the toner and paper dust on the pressure roller.
(7) Exit roller
The exit roller of the fuser unit discharges the paper separated from the fuser and pressure rollers with
the separation fingers through the fuser unit.
(8) Fuser unit exit sensor
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