ENWW Image formation system 165
Primary transfer roller engaging/disengaging control
This controls the disengagement of the primary transfer roller from the photosensitive drum to
transfer only K (black) toner onto ITB for monochrome print.
The DC controller sends a control command and drives the primary transfer roller engaging motor
(M5).
The following is the sequence of this control.
1 The primary transfer engaging cam inside the ITB unit is holding the primary transfer rollers for
Y, M, and C, with the primary transfer roller holder, keeping the ITB in contact with the
photosensitive drums.
2 When a monochrome print starts, the DC controller rotates the primary transfer roller
disengaging motor (M5) clockwise for a specified time.
3 When the M5 rotates for the specified time, the primary transfer disengaging cam turns one-
quarter of a revolution.
4 As it turns, the cam pushes the primary transfer roller holder down and disengages the Y, M,
and C rollers from the photosensitive drum.
The primary transfer rollers engage back with the drums when the M5 is turned counterclockwise
and the cam pushes the holder up.
Figure 5-49 Primary transfer roller engaging/disengaging control
Note The opposite photosensitive drums (Y, M, and C) stop when the primary transfer rollers are
disengaged.
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