Sharp AR-6020V Service Manual page 131

(4) Fusing operation
Toner on paper is heated and pressed to be fused by the heat
roller.
The heater lamp is in the heat roller, which heats the heat roller to
fuse toner onto paper.
The pressure roller is made of silicon rubber because of the follow-
ing reasons and purpose.
1) Paper is separated. (Since the heat roller is of higher hard-
ness, the pressure roller is deformed to separate paper toward
the heat roller.)
2) The nip quantity is increased to increase heat capacity for
paper.
3) By pressing paper with the flexible roller, toner is fused without
deformation.
(5) Fusing temperature control
The temperature sensor is provided at the center of the heat roller.
The roller temperature is detected by the thermistor sensor, and the
heater lamp is controlled so that the temperature is maintained at
the specified level.
Heat Roller
Pressure Roller
AR-6020V OPERATIONAL DESCRIPTIONS 11 – 24