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November 2003 © TOSHIBA TEC 3 - 7 e-STUDIO3511/4511 COPY PROCESS
3
(6) 1st transfer
• 1st transfer is a process of transcribing the
toner image (visible image) formed on the
photoconductive drum to the transfer belt. A
positive bias is applied to the transfer roller,
causing the transfer belt to be positively
charged. This in turn helps to form an electric
field E between the transfer belt (positive) and
the photoconductive layer of the
photoconductive drum (grounded), thus making
the toner image transferred to the transfer belt.
In the copy process of this equipment, images
are transferred in the order of K→C→M→Y on
the transfer belt.
(7) 2nd transfer
• An electrostatic attracting force occurs between
the polarized charge (negative) on the lower
surface of transfer belt and the belt itself (positive).
That makes the toner being absorbed from the
belt to the paper. Then an electric field is formed
between the 2nd transfer roller and the transfer
belt drive roller, which generates a paper
polarization and thus the toner is transferred from
the belt to the paper.
E
Aluminum base
Photoconductive layer
Transfer belt
Toner
1st transfer roller
Photoconductive drum
Transfer belt
Photoconductive
drum
Fig. 3-312
Fig. 3-313
Fig. 3-314