Toshiba 350 All in One Printer User Manual


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12
e-STUDIO350/352/353/450/452/453
DEVELOPMENT SYSTEM
© 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved
12.2 Functions
(1) Toner cartridge drive unit / Toner cartridge detection switch
Thetonercartridgeislledwithtoner.Thetonermotordrivesthecartridgetosupplythetonerto
the developer unit.
The toner cartridge detection switch detects whether the toner cartridge is installed.
(2) Developer unit
(a) Developer material
The developer material is made of a mixture of the carrier and toner.
The carrier is an electrical conductive ferrite whose size is 30µm to 100µm. The toner is a resin
particle whose size is 5µm to 20µm.
The developer material needs periodic replacement since its quality is deteriorated by long use.
(b) Mixers-1 and -2
Friction is generated by mixing the developer material. The carrier is charged to (+) and the
toner to (–), and the image is formed on the drum surface by the static electricity caused by the
friction.
(c) Developer sleeve (Magnetic roller)
This is an aluminum roller with a magnet inside. The magnet works to absorb the developer
materialandformsthemagneticbrush.Themagnetisxedandonlythesleevearoundis
rotated. This rotation makes the magnetic brush of the developer sleeve sweep over the drum
surface and perform development.
(d) Doctor blade
Doctor blade controls the amount of the developer material transported by the developer sleeve
so that the magnetic brush of the developer material contacts with the drum surface properly.
(e) Auto-toner sensor
Thecarrierandthetoner(tonerdensity)inthedevelopermaterialshouldbealwaysxedtoa
certain ratio to output normal images. The auto-toner sensor detects the inclusion ratio of the
toner in the developer material by using a magnetic bridge circuit. When the quantity of toner
becomesinsufcient,thetonermotorisdriventosupplythetonerfromthetonercartridge.
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