14. Transfer Corona section
Theory of Operation Ver. 8.0 Jun. 2008
8
2
Composition/Operation
14.3.6
Transfer belt cleaning
• To scrape residual toner off the surface of the transfer belt, the transfer belt is provided
with a cleaning brush and a charging brush.
• The cleaning brush is a rotary brush. To enhance its ability to scrape residual toner off
the surface of the transfer belt, the brush is turned in a direction opposite to that of the
transfer belt. The cleaner motor provides the drive for this system.
• To make toner on the surface of the transfer belt easier to be removed, two types of bias
(+DC and –DC) are applied to the belt through a different route.
• Residual toner on the surface of the transfer belt is in a state of mixture of positive and
negative charges. The charging brush supplies negative charge to the toner to make the
toner negatively charged. The toner collecting roller supplies positive charge to collect
toner with the cleaning brush.
1.
+DC bias: Toner collecting roller
o
Cleaning brush
o
Transfer belt
o
Driven roller
o
GND
2.
-DC bias: Charging brush
o
Transfer belt
o
Driven roller
o
GND
A. Operation timing
• During a print cycle, an image stabilization operation, the 2nd transfer roller cleaning,
and other states whenever the transfer belt operates.
A00JT2C051DA
A00JT2C045AA
Cleaning brush
GND
Transfer belt
Toner collecting
roller
Driven roller
HV2
Toner collecting screw
Charging brush
Cleaning start signal
Transfer belt motor (M1)
Cleaner motor (M38)
Cleaning bias (+/-)
A00JT2E516DA
Theory of Operation Y107522-3
