K117sm3e1
3-10
Even if some toner has not been removed by the Cleaning Roller but remained on the -630V area
of Drum (It corresponds to the white area of the print) in the later [3.1.2.7 Drum Cleaning], this
toner is removed at the time of Development because it moves to the Developer Roller of which
potential (-230V) is higher than that of Drum (-630V).
So there will be no case that unnecessary black spot is printed on the white area of the print.
The remained toner that moved to the Developer Roller is carried into the Developer Unit and then
reused.
1. Toner remained on the Drum
2. Toner moves from the Drum to the Developer Roller.
3. Developer Roller carries the toner toward the Toner Supply Roller
4. Toner is shifted to the inside of the Developer Unit by the revolution of Toner Supply Roller.
5. Toner is reused.
Before Development After Development
(Toner is remaining on the white area.) (Toner is removed from the white area.)
The Developer Unit has not only the Developer Roller but also 2 more rollers inside which
are also supplied with the individual voltages.
The Developer Unit controls the movement of toner in the unit taking advantage of the
difference of potentials among these rollers, and covers the Developer Roller with the toner
in the end.
Refer to [3. 1. 3 Controlling the Movement of Toner in the Developer Unit] to know how the
Developer Unit controls the movement.
Reference
-20V -630V
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