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6 November, 2001
PRINTING PROCESS OVERVIEW
Image Transfer
Paper is fed into the area between the drum surface and the transfer belt [D] at the
proper time to align it with the image on the drum. The transfer bias roller applies a
high positive charge to the reverse side of the paper through the transfer belt. This
positive charge pulls the toner particles from the drum surface onto the paper while
the paper is electrostatically attracted to the transfer belt.
Separation
Paper separates from the drum as a result of the electrical attraction between the
paper and the transfer belt. Pick-off pawls [E] help separate the paper from the
drum.
ID Sensor
The ID sensor [F] measures the reflectivity of the pattern formed by the laser on the
surface of the drum. This output signal is used for toner supply control and also
measures the drum surface reflectivity, which is used for charge roller voltage
control.
Cleaning
The drum cleaning blade [G] removes any toner remaining on the drum surface
after the image is transferred to the paper.
Quenching
Finally, the light from the quenching lamp [H] electrically neutralizes the charge on
the drum surface.
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