Formation Of Magnetic Brush - Kyocera Mita KM-4530 Service Manual

2BC/D

(1) Formation of magnetic brush

The developing magnet 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 that is used
for developing. 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 PCB (HVTPCB) is applied to the developing magnet to provide image contrast.
Developing magnet
2-1-22
Doctor blade
A
A: 0.53 ± 0.05mm (between the doctor blade and the developing magnet)
S2
74.5
85.5
N3
N1
59
43.5
S1
N2
Figure 2-1-25 Forming a magnetic brush
Poles on the developing magnet
×
-4
N1: 830 10
×
-4
N2: 630 10
×
-4
N3: 450 10
×
-4
S1: 860 10
×
-4
S2: 700 10