Oce 7050, Техническое и сервисное руководство, Страница: 132 / 275

ed. 6 08 Fusing 501
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001
Functional Description
1 Fuser
In previous LV-DE machines, fusing was done with heat and pressure by
means of heat rollers. In the Océ 7050 only heat and radiation in combination
with LET (Low Energy Toner) is used. To get a correct fusing, the temperature
must be much higher than usual (
±
300
°
C). At this high temperature, fumes
can evaporate out of the paper. Sometimes it is possible that you can smell
these fumes. Assure the customer that these fumes are harmless and that it is
not ozone.
The paper is transported through the fuser over a grid, while it is being heated
from the underside.
2 Safety Precautions
To prevent the paper in the fuser from overheating, several precautions have
been taken:
■
The temperature in the fuser is kept as low as possible.
Paper burns spontaneously at a temperature of 425
°
C and when lighted it
burns at a temperature of 375
°
C. The temperature of the heaters will never ex-
ceed 330
°
C.
■
An absorber is used.
When small paper is used, only a small amount of the heat is absorbed by the
paper. So the temperature at the sides will rise. When the temperature gets too
high, the absorber cooling is switched on. The cooling is realised with fuser fan
left 08M1 and fuser fan right 08M2. There is also a natural air stream at the
rear of the fuser.
■
Protection gauze above the heaters.
This gauze prevents large paper clippings from reaching the heaters (small
clippings are harmless).
■
Reliable paper path.