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3.2.4 Fixing stage
The toner image transferred to the paper in the transfer stage is held only by electrostatic
attraction and slight physical adhesion, so even a light touch will smear the image.
In the fixing stage, the toner image is fixed by heating the paper and applying pressure. This
fuses the toner particles to the paper to make a permanent image.
Figure 2.15
Step 6 Fixing
The upper roller surface is PFA-coated. The upper and lower roller surfaces are grounded via
a diode to prevent the negative potential of the upper roller becoming higher than that of the
lower roller, resulting in the toner being drawn to the lower roller, and adhering to the lower roller
surface.
3.2.5 Drum cleaning stage
In the transfer stage, not all the toner is transferred to the paper. Some remains on the
photosensitive drum. This residual toner is cleaned off in the drum cleaning stage so that the
next print image will be clear.
Step 7 Drum cleaning
Photo-
sensitive
drum
Prior to the next printing, the residual toner on the drum surface is scraped away by the cleaning
blade to clean the drum surface. The removed toner is collected in the cleaner container.
Cleaning blade
Sweeper strip
Cleaner container
Figure 2.16
Upper fixing roller
Toner
Paper
Lower fixing roller
Halogen heater