Mita PointSource Ai 3010, Руководство по обслуживанию

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2AR
1-3-21
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.
1 3 2
4
7
6
5
A
S1
68.2˚
60˚
69.3˚
92˚
N2
S2
S3
N1
Magnetic poles on the developing roller
A: Distances beteen the doctor blade and
developing roller: 0.6
±
0.05 mm
N1: 860
×
10
–4
T
N2: 640
×
10 –4 T
S1: 590
×
10
–4
T
S2: 485
×
10 –4 T
S3: 605
×
10
–4
T
Figure 1-3-18 Forming a magnetic brush
5
Right developing spiral
6
Left developing spiral
7
Developing paddle
1
Developing unit housing
2
Developing roller
3
Toner sensor (TNS)
4
Doctor blade