Toshiba E-STUDIO900 manual Development Mechanism

2.6.2 DEVELOPMENT MECHANISM

[E]	[F]
[C]

[H]

[G]

[A]

[D]

[B]

Toner and developer are mixed in the toner agitator by the cross-mixing roller [A]. The paddle roller [B] picks up the developer and sends it to the upper development roller

[C].Internal permanent magnets in the development rollers attract the developer to the development roller sleeve. Developer from the upper development roller sleeve is also attracted to the lower development roller [D].

The upper development roller carries the developer past the doctor blade [E] which trims the developer to the desired thickness. Backspill (excess toner) spills over the separator [F] to the toner transport coil [G] which sends the developer from back to front to the cross-mixing roller.

In this machine, black areas of the latent image are at a low negative charge (about – 150 V) and white areas are at a high negative charge (about –800 V).

The development roller is given a negative bias to attract negatively charged toner to the black areas of the latent image on the drum.

The development rollers continue to turn, carrying the developer to the drum [H]. When the developer brush contacts the drum surface, the low-negatively charged areas of the drum surface attract and hold the negatively charged toner. In this way, the latent image is developed.

PTM 2-49 B070/B071