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1159SBM1900A
kee FUSING UNIT
The Upper Fusing Roller and Lower Fusing Roller together apply heat and pressure
to the toner and paper to permanently fix the developed image to the paper.
Drive for the Upper Fusing Roller is transmitted from the Main Drive Motor to the
Upper Fusing Roller Drive Gear. The Lower Fusing Roller is in contact with, and thus
driven by, the Upper Fusing Roller.
:
Fusing Thermoswitch
Fusing Thermistor
Paper Exit Roll
Upper Fusing Roller
Lower Fusing Roller
XK
1159M012AA
Pressure Spring
M-46
IS9SBMISO1A
19-1. Fusing Temperature
Control
This copier employs a roller packed with heat insulator for the Upper Fusing Roller to
shorten warming-up time. Fusing Thermistor TH1 fitted to the Upper Fusing Roller is
used to keep an optimum fusing temperature at all times (controlled fusing temperature:
190°C).
in standby : Temperature control at 170(0 is provided considering the heating
speed by the heater and the time it takes the paper to enter the Fusing
Unit.
During a: Temperature is controlled at 200(C for the first 2 minute after the start
copy cycle of the copy cycle. If a multi-copy cycle runs over 2 minute, a 190°C con-
trol is provided after the 2-min. period.
TH1 is located at a point 20.9 mm to the rear with reference to the paper path reference
position, thereby preventing low-temperature offset and insufficient fusing strength that
could otherwise occur when small-size paper is fed through.
The Upper Fusing Roller is also provided with Fusing Thermoswitch TS1 that turns OFF
to cut off the power line to the Fusing Unit when the roller gets abnormally hot.
Warming-up Time = Within 10 sec.
A
ee
170°C
}-----------
160°C
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In Standby
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During a Copy Cycle
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Warming-up Completed
T1S9M047AA
M-47
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