Xerographic Process - Fusing; Fusing Unit - Ricoh Pro C7200x Operating Instructions Manual

2. Mechanism

Xerographic Process - Fusing

Fusing Unit

The fusing belt has a thick elastic layer, as with the previous model, to allow the belt to reach farther into
the surface indentations of textured media.
Fusing roller
Pressure roller
A total of four heaters are used in the fusing unit: three in the heating roller [11], one in the pressure
roller [13].
Toner is fused onto the media by applying heat to the fusing belt [12] via the heating roller [11],
maintaining consistent temperature and pressure on the media.
The heater in the pressure roller [13] functions as a supplementary heater, to maintain consistent
temperature at the nip between the fusing and pressure rollers.
The fusing temperature can be adjusted by print mode(BW/FC/FCS/S), as the optimum fusing
temperature is dependent on the amount of toner.
(The more there is toner, the more heat needed for fusing. Clear toner also requires high fusing
temperature to yield the gloss effect.)
The fusing temperature is momentarily increased one notch immediately before the paper passes
through the nip, to compensate for the slight temperature drop of the fusing belt [12] due to the heat
absorption by the paper.
In addition, the target fusing temperature is momentarily increased another notch immediately before the
pressure roller [13] contacts the fusing belt, to compensate for the slight temperature drop due to the
contact.
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Fusing belt
Conventional fusing belt
New fusing belt
Toner
Base layer
Elastic layer
Surface layer
Textured paper
Base layer
Elastic layer
Surface layer
Textured paper
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12
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