SF-7300
SF-7350
Step 7: Transfer (Transfer corona unit)
The cqy paper is chargedto a hgher potentialthan the drum sur-
face by means of a negaWe transfercorona unit,a strongerattrac-
tion exists appears between the copy paper and the tonerthan b-
tween the drum and the toner. So the toner ia drawnfrom the drum
to paper.
Toner transfer efficiencyis between 70 to 8070, 20 to 30Y0remains
on the drum.
Aluminium
layer
+++++
CGL — “.. ... . .. ~ .’
cn —
OPC drum
● Toner
J
Copy
paper
/
I
~ Transfercorona unk
1,
Step 8: Cleaning
The toner remainingon the drum sudace is removed by means of
the cfaaning bbde. The waste toner is then depositedin the waste
toner-tainer usingthe waste tonercarryingshaft.
Blade
C~ CGL Aluminiumlayer
Step 9: Dl=harge
By exposing the drum sudace to the dbcharge lamp, postive and
negative charges appear in the CGL. The negative charge
producedin the CGL advances toward the residualpos~tie charge
in the aluminiumlayer, whik the poaitivech~e advances in the
aluminumtowd the restiud negahe charge on the drumsurface.
In this way, the poaitfvecharge and the negatie charge neutralhe
each otheron the drumsurfaceand inthe aluminiumlayer.
This causes the drum surfacepotentialto approachOVORS
m
Discha~e lamp
\
Lght ~
Residual
Aluminiu
al
&arge
C. Transition of drum surface potential
OPC dmm,
A
D. Functional diagram
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