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November 2003 © TOSHIBA TEC 16 - 1 e-STUDIO3511/4511 FUSER UNIT/PAPER EXIT SECTION
16
16. FUSER UNIT / PAPER EXIT SECTION
16.1 General Description
Toner is fused by applying heat and pressure on the transferred image on the paper which is transported
to the fuser unit. The paper is then transported to the receiving tray, paper exiting options or ADU. The
fuser unit consists of the IH coil, fuser roller, pressure roller, fuser belt, separation roller, separation
fingers, separation plate, cleaning roller, oil roller, thermistors, thermostat, exit roller, exit sensor, etc.
Fig. 16-101
16.2 Operation
The fuser belt is located between the fuser roller and pressure roller. The fuser roller is pressed with the
spring force from the pressure roller side, and it is rotated by the transport motor drive. The fuser belt
also rotates simultaneously. Then the paper transported to the fuser unit is hold between the fuser belt
and pressure roller and the toner is fused on the paper with heat and pressure. After this, the separation
fingers, belt separation mechanism and separation plate separate the paper from the fuser belt. Then
the paper is transported to the receiving tray, paper exiting options or ADU through the exit roller. In
addition, the IH coil in the fuser roller does not structurally rotate.
The thermistors control the temperature of fuser roller and detect temperature abnormalities. If the
temperature becomes excessively high, the thermostat is opened to stop the power supply to the IH coil.
When transporting OHP film or thick paper in color modes, the transport speed is lowered to the range
from 1/2 to 1/4 in order to improve fusing efficiency. The exit motor which drives the exit roller is decelerated
at the same time.
Separation roller
Fuser belt
Separation finger
Pressure roller
IH coil
Thermistor
Thermostat
Fuser roller
Oil roller
Cleaning roller
Separation plate
Exit sensor
Exit roller