Oki OKIFAX 5950 Series Maintenance Manual page 459

(4) Developing
Toner is attracted to the electrostatic latent image on the image drum surface, converting
it into a visible toner image. Developing takes place through the contact between the
image drum and the developing roller.
As the toner supply roller rotates while rubbing on the developing roller, a friction
1
charge is generated between the developing roller and the toner, allowing the toner to
be attracted to the developing roller (the developing roller surface is charged positive
and the toner, negative.)
The toner attracted to the developing roller is scraped off by the doctor blade, forming
2
a thin coat of toner on the developing roller surface.
Toner is attracted to the exposed portion (low-potential part) of the image drum at the
3
contact of the image drum and the developing roller, making the electrostatic latent
image visible.
OF5750/5950 Series January 2001
Charge roller
Developing roller
Image drum
-300V
+ + + + + + + + + + + + + + +
— — — — — — — — — — — — — — —
+ + + + + + + + + + + + + + + + + + + + + + +
-750V -100V -750V
Exposed Exposed
part
An illustration of activities at the contact point of the
image drum surface and the developing roller (arrow
marks denote the direction of the electrical field).
A3 - 31
Doctor blade
Toner supply roller
Developing roller
+ + + + + + + +
— — — — — — — — Toner
-750V
Image drum
part
-100V
R76-