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11
e-STUDIO350/352/353/450/452/453
DRUM RELATED SECTION
© 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved
11.2 Functions
(1) Drum
Thedrumismadeofacylindricalaluminumbasecoatedwiththinlmoforganicphotoconductive
substance.
The photoconductive object becomes insulative (the electrical resistance is high) when it is not
exposed to the light and electrically conductive (the electrical resistance is low) when it is ex-
posed to the light. This object is called a photoconductor.
(2) Main charger
The main charger consists of a metal rod with U-shaped section, insulated blocks at both ends of
the rod and charger wire attached between them.
When a high voltage is applied to the charger wire, the air around it is charged (ionized). The ion-
izedairthenowsintothedrumcausingittobecharged.Thisphenomenoniscalled“coronadis-
charge”. Negative charge caused by the corona discharge and grid is applied to the drum surface
evenly in dark place. The main charger is equipped with a wire cleaner to clean the wire.
(3) Cleaner
(a) Cleaning blade
This blade is pressed against the drum surface with a constant force by the pressure springs,
and scrapes off the residual toner from the drum surface.
(b) Recovery blade
This blade catches the toner scraped off by the cleaning blade.
(c) Toner recovery auger
This auger carries the residual toner scraped off to the toner bag.
(d) Toner bag full detection sensor -1
The sensor detects the toner bag full when it is pushed by the toner recovery auger in the
cleaner which is given a pressure from the used toner in the toner bag.