Oki OKIPAGE 24DX Service Manual page 44

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 part (low-potential part) of the image drum at the contact between the image
drum and the developing roller, making the electrostatic latent image visible.
(6) Transfer
The transfer roller is composed of conductive sponge material and is designed to make the image drum surface and
the paper closely into contact.
Paper is placed over the image drum surface, and a positive charge, opposite in polarity to the toner, is applied to
the paper from its reverse side.
The application of a high positive voltage from the power supply to the transfer roller causes the positive charge
induced to the transfer roller surface to be transferred to the paper at the contact between the transfer roller and the
paper. As a results, toner charged negative that is attracted to the image drum surface is transferred to the upper
side of the paper by the
positive charge on the lower side of the paper.