Overview - Gestetner B147 Service Manual

6.11 IMAGE TRANSFER AND PAPER SEPARATION

6.11.1 OVERVIEW

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1. Transfer unit drive motor
2. Transfer belt
3. Rotation encoder
4. Paper attraction roller
5. Transfer roller
6. Back-up roller
Paper is fed to the transfer belt before image transfer begins. The paper attraction
roller charges the paper to ensure that the paper is attracted to the belt.
The magenta, cyan, yellow, and black color images transfer to the paper while the
transfer belt feeds the paper past the drums towards the fusing unit. A positive
charge is applied to the paper under the transfer belt, opposite each drum, to
transfer the toner from the drums onto the paper. The back-up roller ensures that
the contact area between the drum and belt is sufficient.
The cleaning unit in the transfer unit cleans the belt surface with the cleaning blade
and brush. The waste toner collected from the belt is transported to the waste toner
bottle.
There are three ID sensors (front, center, and rear). Only the center ID sensor
detects the image density of the patterns generated on the transfer belt for process
control. The other function of the ID sensors is for automatic line position
adjustment. All ID sensors are used for this.
SM
IMAGE TRANSFER AND PAPER SEPARATION
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7. Cleaning blade
8. Toner collection auger
9. Cleaning brush
10. Cleaning unit
11. ID sensor
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G080D701.WMF
B147/B149/B190