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1-3-27
Formation of magnetic brush
The developing roller consists of a magnet roller with five poles and a sleeve roller.
Rotation of the sleeve roller around the magnet roller entrains developer, which in turn
forms a magnetic brush at pole N1 on the magnet roller. The height of the magnet brush
is regulated by the doctor blade; the developing result is affected by the position of the
poles on the magnet roller and the position of the doctor blade.
A developing bias voltage generated by the high-voltage transformer (HVTPCB) is
applied to the developing roller to provide image contrast.
7
6
4
1
5
2
3
A
Figure 1-3-25 Forming a magnetic brush
A: Distances beteen the doctor blade and
developing roller: 0.53 ± 0.05 mm
N1: 830
× 10
–4
T
N2: 630
× 10
–4
T
N3: 450
× 10
–4
T
S1: 860
× 10
–4
T
S2: 700
× 10
–4
T
5 Developing spiral A
6 Developing spiral B
7 Developing spiral C
1 Developing unit housing
2 Developing roller
3 Toner sensor (TNS)
4 Doctor blade
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