Timing
Toner supply for a particular color is performed only when the development
section for that color is at the development position.
The Bk toner cartridge [A] is installed at the center of the development unit,
and is separated from the Bk hopper section [B] and the Bk toner supply
section [C]. The color cartridges (CMY) [D, E, F] are installed around the Bk
toner cartridge and each contain a hopper mechanism.
For C, M, and Y toner the process is as follows:
1. The toner supply motor [G] is switched on/off by a fuzzy control process
based on toner concentration on a standard ID sensor pattern. The toner
supply motor is located at the front side of the development unit and
drives the toner supply roller [H] via gears.
While the development unit rotates, the toner supply solenoid [I] turns on
to prevent the drive from the toner supply motor from turning the toner
supply roller.
2. When the toner supply roller [H] turns, toner moves from the hopper
section [K] to the toner supply section [J]. Then toner is carried to the
rear by the inner auger [L] of the dual mixing roller.
[H]
[J]
[L]
[K]
[B]
[C]
[D]
[E]
[F]
[A]
[I]
[H]
OFF
ON
[G]
DEVELOPMENT UNIT
A166/A187/A189 2-82 SM
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