KIP 9000 Service Manual page 89

Taking advantage of the difference of potentials among these rollers, the movement of toner is
controlled in the Developer Unit as follows.
1. The Toner Supply Roller carries the toner toward the Developer Roller.
2. The voltage of the Toner Supply Roller is 350V lower than that of Developer Roller. When
the toner reaches the contact point of these rollers, it moves onto the Developer Roller. Then
the Development Roller carries the toner toward the Regulation Roller.
3. The Regulation Roller is strongly pressed to the Developer Roller by the spring, and these
2 rollers move to the opposite direction each other at the contact point. The Developer Roller
carries much toner, but the Regulation Roller limits the amount of toner that can pass
through between 2 rollers. As a result very small amount of toner can pass through between
rollers and the rest is returned back to the inside. As the voltage of Developer Roller is 100V
higher than that of Regulation Roller (Center), the toner passed through between rollers is
surely attracted to the Developer Roller. Very thin layer of toner is evenly formed on the
surface of Developer Roller as a result.
4. Much toner sticks onto the Regulation Roller when it is returned back to the inside. This
toner is scraped off by the Scraper which is contacted to the Regulation Roller.
Scraper
Toner Supply Roller
(-350V against Developer Roller Bias)
Regulation Roller : Center
(-100V against Developer Roller Bias)
3-16
Developer Roller
(-YV against GND)
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