Developer Unit; Touch Down Developing Method - Kyocera Mita FS-C5016N - Color LED Printer Service Manual

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(2) Touch down developing method

Touchdown development system is a development system having the best of both mono-component system and dual
component system. Dual component developer which is a powder of mixture of toner and carrier powder is continuously
agitated by mixer screws A and B in the toner hopper in the developer unit. The toner and carrier powder are adsorbed to
each other by means of electrostatic charge developed by the friction when they are stirred. The developing magnet roller
is comprised of a magnet and a sleeve which revolves coaxially with the magnet. The developer powder forms 'brushes' of
toner and carrier on the magnet sleeve along the magnetic field centering the magnet. The 'brushes' are truncated to a
constant length of height (approximately 0.5 to 0.55 millimeters) as they pass under the doctor blade. The developing mag-
net roller lies along the developing sleeve at the distance of 0.40 millimeters. As the developing magnet roller revolves, the
brushes formed at pole N1 sweep the developing sleeve and the toner is transferred to the developing sleeve as it is
attracted by the difference in potential between them. The toner on the developing sleeve is approximately 70 micrometer
in thickness. The developing sleeve is located 0.23 millimeter from the drum. The toner is transferred to the drum by
means of the DC/AC bias applied to the developing sleeve.
Mixer screw A
Developing
magnet roller
S
Magnetic
brush

Developer unit

Toner hopper
Toner
Carrier
Mixer screw B
Developing
magnet roller
S
N
Developing
sleeve
A
Doctor blade
B
C
LED print head
A
B
N3
S2
N2
S1 N1
Developing
sleeve
Developing
sleeve
70 µm
Figure 2-1-13
: 0.50 to 0.55 mm
: 0.40 mm
: 0.23 mm
Main charger
Drum
C
Drum
FS-C5016N
2-1-9

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