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The toner image on the photosensitive drum is transferred onto the ITB in this step. (The ITB
is a thin seamless belt made of resins. It is of low resistance and eliminates the applied bias
by itself.)
As a positive DC bias is applied to the transfer roller opposite the drum to charge the ITB
positive, a negatively charged toner on the drum is transferred onto the ITB. Each color’s
toner image is transferred in order of Y, M, C, and K and forms one toner image, overlaying
one color’s image on another.
Figure 5-32.
Primary transfer
Step 5: Secondary transfer
A toner image on the ITB is transferred onto paper in this step.
After the paper is fed into the primary transfer, the secondary transfer roller is raised to press
the paper onto the ITB. A positive DC bias is then applied to the secondary transfer roller to
charge the paper positive so that the negatively charged toner image formed on the ITB is
transferred onto the paper.
Figure 5-33.
Secondary transfer
Step 6: Separation
Paper is separated from the ITB by the elasticity of paper.
ENWW Image formation system 153