6.2.6 Development Bias
The high voltage supply board [A] applies the development bias (ac and dc)
to the development roller [B] that is currently in position through the bias
terminal [C].
The development roller is composed of the roller, development sleeve, and
magnet shaft [E]. When the development roller rotates, the development
roller and sleeve rotate, but the magnet shaft does not. (If the magnet shaft
were to rotate, toner could spill which would get into the contact between it
and the bias terminal.) The bias terminal has a spring [F] which pushes it
against the magnet shaft to prevent a poor terminal contact condition when it
reaches the development position.
While the development unit rotates, dc bias is applied from the high voltage
supply board. When the development roller is about to contact the bias
terminal, this dc bias prevents any toner which could have been dislodged
during gear meshing, from being attracted to the drum (see also section
6.2.5: Drive Mechanism).
[C]
[D]
[E]
[B]
[A]
[F]
[E]
[D]
Detailed
Section
Descriptions
DEVELOPMENT UNIT
SM 2-85 A166/A187/A189
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