Fusing - Ricoh FT5034C Service Manual

4.11 FUSING

4.11.1 Overview
Hot Roller Stripper
Fusing Exit
Rollers
Pressure
Spring
The image is fused to the copy paper by two rollers which apply heat and pressure.
The hot roller is made of teflon and the pressure roller is made of silicone rubber.
Pressure is constantly applied between the rollers.
There is no pressure release mechanism.
This model uses an oilless hot roller system, and does not have a hot roller cleaning
mechanism.
Hot roller:
Pressure roller: The pressure roller presses the paper into contact with the hot
Thermistor:
Thermofuse:
The fusing lamp, which is located at the hot roller axis, is turned
on and off to maintain the operating temperature.
roller. The pressure comes from two pressure springs.
The CPU monitors the hot roller surface temperature through a
thermistor and controls the fusing temperature.
A thermofuse is installed in series with the fusing lamp, in case
the thermistor overheat protection fails. If the thermofuse
temperature an abnormally high temperature, the thermofuse
opens, disconnecting power from the fusing lamp.
Hot Roller
Fusing Lamp
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Fusing Thermistor
Pressure Roller
Pressure Lever