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Chapter 6 Principles of Operation
6-317
1.3 Description of Printing Process Techniques
1.3.1 Charging with electricity
In the charging process, the drum surface rotating at a constant speed is charged uniformly with negative
electricity by discharging of RTC (Rubber Tube Charge: Charged film).
This process is performed in parallel for yellow, magenta, cyan and black colors.
✧ The RTC is kept in contact with the drum and rotates following the rotations of the drum.
RTC is a conductive roll, receives discharge voltage from HVPS (High Volume Power Supply) and
discharges at minus DC voltage.
✧ The drum surface is uniformly and negatively charged with DC bias voltage.
The drum surface is optical conductor (which is insulator in a dark place and conductor when receiving
light) and the drum inside is composed of conductor.
✧ The Refresher is a conductive brush, and it receives negative DC voltage from the HVPS to catch the
toner of reverse polarity returned to the drum via IDT. Also, it removes discharge products.
Drum surface
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HTC
Refresher
HVPS
Optical conductor
Conductor
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Drum
Electric potential
on drum
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RTC