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This mechanism functions whenever the ITB rotates to prevent misalignment of the ITB.
Figure 5-49.
ITB self-aligning mechanism
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.
ENWW Image formation system 171