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FUSER UNIT
13 - 1
13. FUSER UNIT
13.1 Outline
The toner is fused on the paper separated from the photoconductive drum by having heat and pressure
applied to it. The paper is then discharged through the paper exit section. The fuser unit consists of the
IH coil (IH-COIL), fuser roller, pressure roller, separation fingers, cleaning web, thermistors (THM1, 2, 3
and 4), thermostat (THMO1 and 2), fuser exit rollers, fuser transport sensor (S9), etc.
Fig. 13-1
13.2 Operation
At the fuser unit, the toner is fused on the paper which has been separated and transported from the
photoconductive drum by having heat and pressure applied to it. The pressure and fuser rollers are
rotated by the driving of the fuser motor (M3). The fuser roller has an IH coil (IH-COIL) inside, which
does not rotate itself. The fuser and pressure rollers are always pressured by a spring force. After being
fused, the paper is separated smoothly from the fuser roller by the separation fingers.
The thermistors (THM1, 2 and 3) detect the fuser roller temperature to control it, and when the
temperature becomes abnormally high, which is detected by thermostats (THMO1 and 2), the power
supply to the IH coil (IH-COIL) is cut off.
Cleaning web
Web motor
Fuser exit roller
Separation finger
Pressure roller
Pressure roller thermistor
IH coil
Fuser roller thermostat
Fuser roller thermistor
Web detection sensor
Fuser transport sensor
Web pushing roller
Fuser roller