Oki OKIPAGE 10ex Maintenance Manual page 30

(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.
1 As the toner supply roller rotates while rubbing on the developing roller, a friction 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).
2 The toner attracted to the developing roller is scraped off by the doctor blade, forming a thin coat
of toner on the developing roller surface.
3 Toner is attracted to the exposed portion (low-potential part) of the image drum at the contact
of the image drum and the developing roller, making the electrostatic latent image visible.
40718401TH Rev.5
Charge roller
Image drum
-300V
+ + + + + + + + + +
– – – – – – – – – –
+ + + + + + + + + + + + + + + + + + + + + + +
-750V -100V
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).
Doctor blade
Toner supply roller
Developing roller
Developing roller
+ + + + + + + + + + + + +
– – – – – – – – – – – – –
Toner
-750V -750V
Image drum
Exposed
part
-100V
30 /