Toshiba 4511, 3511 manual Fuser Unit / Paper Exit Section, General Description

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.

Exit roller	Separation roller
Exit sensor	Fuser belt

Separation plate

Cleaning roller

Oil roller

Fuser roller

Thermostat

Separation finger

Thermistor IH coil

Pressure roller

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.

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November 2003 © TOSHIBA TEC 16 - 1 e-STUDIO3511/4511 FUSER UNIT/PAPER EXIT SECTION