The application of a high positive voltage the from the power supply to the transfer roller causes the positive charge inducement on the transfer roller surface,

transferring the charge to the paper as it contacts the transfer roller. The toner with negative charge is attracted to the image drum surface, and it is transferred to

the upper side of the paper due to the positive charge on the reverse side of the paper.

(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 predetermined 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 3.76 kg applied by the pressure spring on each side.

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