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EPL-N2700 Revision A
Operating Principles Printer Mechanism Operating Principles 71
2.1.6.4 Transfer Section
The transfer roller transfers the toner image on the surface of the PC
drum onto the paper. A positive transfer bias is applied to the transfer
roller so that the toner (reduced negative voltage) on the surface of the
PC drum sticks to the paper.
The transfer bias is transmitted via; HV transformer (high voltage unit)
→
contact plate
→ compression spring → transfer roller bushing → transfer
roller.
For constant image quality, the engine controller manages changes
voltage (around 20
µA) depending on the paper type and color duty
(black and white).
The paper then passes through the needle pole and the static electricity
remaining on the paper is discharged to the ground. This enables
forcible separation of the paper form the PC drum.
After the transfer roller, the paper passes discharging pole. The
discharging pole prevents the toner from moving due to discharge
electricity produced while paper is separated from the transfer roller.
Figure 2-25. Transfer Section Mechanism
PC Drum
Paper
Transfer Roller
PC Drum
Needle Pole
Transfer Guide
Transfer Roller