Toshiba e-STUDIO453 Service Manual page 89

(6) Transfer
Transfer is the process of transferring the toner
image (visible image) formed on the drum surface
onto paper.
Method : A paper passing the side of the drum is
charged to the opposite polarity to the
that of toner by the corona discharge of
the transfer charger.
The toner moves from the drum surface
onto the paper.
*For smooth transfer
In the transfer bias processing of this equipment,
bias voltage (+580 VDC) is applied to the pre-
transfer guide to prevent the charge produced
by the transfer charger from flowing into the pre-
transfer guide through the paper.
T h e c o r o n a d i s c h a r g e a p p l i e d t o t h e p a p e r
is normally 286 µA DC. However, to improve
transferability at the trailing edge of the paper, lower
output (137 µA DC) is applied to the part 10 mm
from the trailing edge.
(7) Separation
Separation is the process of separating paper
which is temporarily adhering to the drum due to
the static electricity during the transfer process.
Method : Apply AC voltage to which the nega-
tive DC bias is added to the separation
charger.
The positive charge on the paper is
decreased.
The static electricity (adherence power)
between the paper and drum becomes
weak.
The paper is separated from the drum
by its own stiffness and absorption by
the fan.
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Drum
Fig. 3-214
Drum rotation
Toner
Fig. 3-215
Suction fan
(Sub-separation fan)
Drum rotation
Separation charger
Direction of trans-
portation
Fig. 3-216
e-STUDIO350/352/353/450/452/453
Paper
Transfer charger
Direction of trans-
portation
Transfer charger
Absorbing
COPY PROCESS
3