Oki 4M - Manual (Page 31)

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(7) Fusing
The transferred unfused toner image is fused to a sheet of paper because heat and pressure
are applied when it passes between the heat roller and back-up roller.
The Teflon-coated heat roller contains a 400 W heater (Halogen lamp) that heats the heat
roller. The thermistor on the surface of the heat roller keeps the temperature of the heat roller
constant. A thermostat is also installed for safety. If temperature rises abnormally, this
thermostat opens to suspend voltage supply to the heater.
The back-up roller is pressurized to the heat roller by the pressure spring on each side.
Cleaning roller
Transfer roller
OPC drum
Thermistor
Heat roller
Heater
Back-up roller
Pressure spring
(8) Cleaning
After transfer has terminated, the cleaning roller temporarily draws in the untransferred
residual toner adhering to the OPC drum with static electricity and then returns it to the OPC
drum.
Separation claw
High-voltage
power supply