Gestetner A294, Service Manual

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DEVELOPMENT
SM 2-57 A294/A295
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2.6.2 DEVELOPMENT MECHANISM
The paddle roller [A] picks up developer and transports it to the upper development
roller [B]. Internal permanent magnets in the development rollers attract the
developer to the development roller sleeve. The upper development roller carries
the developer past the doctor blade [C]. The doctor blade trims the developer to
the desired thickness and creates backspill to the cross mixing mechanism.
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 –950 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 [D].
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.
A294D303.WMF
[C]
[A]
[B]
[D]
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA