The fusing unit is provided with a mechanism that can raise and lower the pressure roller, so the pressure roller can be pulled away slightly to widen the nip for thick paper and to prevent a rise in temperature.
- At the start of a job, the pressure roller lift motor [A] rotates two cams [B] under the pressure roller [C] to lift it up against the fusing belt and hot roller above.
- At the end of the job, the lift motor rotates the cams again to lower the pressure roller.
Two pressure roller lift sensors with actuators are mounted at each end of the pressure roller shaft to monitor the position of the pressure roller.
- Pressure roller cam HP sensor (front): This sensor detects the home position of the pressure cam.
- The lift sensor [E] at the rear detects if there is a problem with rotation of the cam. It detects when there is too much pressure on the pressure roller.
The following parts comprise the pressure roller unit.
- Entrance Guide (Lower)
- Pressure roller temperature control components
- Pressure roller, separation plate (applied pressure)
- Fusing Exit Guide Plate (Center)
- Sensors (Hot Roller Exit, Jammed Paper)
- Fusing Cleaning Unit
- Pressure roller lift motor (raises and lowers the pressure roller)
- Press roller cam HP sensor (controls the raising and lowering the pressure roller by the pressure roller lift motor)
The default width of the fusing unit nip between the heating roller and pressure roller is 15.9 mm. The width of this nip is usually not adjusted in the field. The fusing unit nip can be adjusted by using a screw driver to raise or lower the pressure roller. This task is the same as that for the Pro907EX Series.