Oki B4100 - Manual (Page 532)

40055101TH Rev.4 532 /
6) Fusing
After the end of the transfer operation, the unfused toner image is fused on the paper under heat
and pressure as it passes between the heater roller and the back-up roller. The heater roller with a
Teflon coating incorporates a 500 W heater (Halogen lamp), which heats the heat roller.
A thermister, which is in contact with the heater roller, regulates the heater roller at a predeter-
mined temperature (about 185 ˚C for OKIFAX 5000 series). A safety thermostat cuts off voltage
supply to the heater by opening the thermostat in the event of abnormal rise in temperature.
The back-up roller is held under a pressure of 2.5 kg by the pressure spring at each side.
Heater roller
Thermistor
Back-up roller
Pressure spring
Separation claw
Heater