Toshiba e-STUDIO350 Service Manual page 75

(6) Transfer
Transfer is the process of transferring the toner
image (visible image) formed on the drum sur-
face 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
pretransfer guide to prevent the charge pro-
duced by the transfer charger from flowing into
the pre-transfer guide through the paper.
The corona discharge applied to the paper is
normally 286 µA DC. However, to improve trans-
ferability 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 temporaily adhering to the drum due
to the static electricity during the transfer pro-
cess.
Method : Apply AC voltage to which the nega
tive DC bias is added to the separa
tion 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 ab
sorption by the fan.
November 2003 © TOSHIBA TEC
Drum
Fig.3-214
Drum rotation
Toner
Fig.3-215
Suction fan
(Sub-separation fan)
Drum
rotation
Fig.3-216
3 - 7 e-STUDIO350/450 COPY PROCESS
Paper
Transfer
charger
Direction of
transportation
Transfer charger
Absorbing
Separation charger
Direction of
transportation
3