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Main Unit Theory of Operation Toner Cartridge / Developing Unit
2-31
II Composition/Operation
7.2.2 Toner flow
1. Toner stored in the Hopper is agitated by the Agitating Blade and conveyed onto the
front side of the Hopper by the Conveyance Screw.
2. The toner conveyed onto the front side of the Hopper is conveyed down to the Toner
Chamber through the Conveyance Pipe.
3. The toner conveyed from the Hopper is conveyed onto the Toner Chamber by the
Replenishing Screw.
4. The toner level detection system provided on the front side of the Developing Unit (the
sensor is mounted on the machine side) detects, at this time, the level of toner still
available for use in the Toner Chamber.
5. The toner conveyed to the Toner Chamber is agitated (charged) by the Replenishing
Screw and Agitating Screw.
6. Toner conveyed onto the rear side of the Toner Chamber is fed to the Supply Roller.
7. Toner fed to the Supply Roller is conveyed onto the Developing Roller.
At this time, the Regulator Blade/1st and /2nd regulate the height of toner on the sur-
face of the Developing Roller.
8. Toner on the Developing Roller is fed to the electrostatic latent image formed on the
surface of the Photo Conductor.
9. Toner left on the Developing Roller is neutralized and returned to the Supply Roller.
10. The toner on the surface of the Photo Conductor is transferred onto the Transfer Belt.
11. Toner left on the surface of the Photo Conductor is scraped off by the Cleaning Blade.
12. The toner scraped off by Cleaning Blade is conveyed to the Waste Toner Storage Tank
by the Toner Collecting Screw.
13. The toner conveyed by the Toner Collecting Screw is stored as waste toner in the
Waste Toner Storage Tank.
4138to2030c0
4138to2011c1
4138to2018c1
Y
M
C
K
Agitating Blade
Conveyance Screw
Conveyance Pipe
Replenishing
Screw
Toner
Collecting Screw
Waste Toner
Storage Tank.
Developing Roller
Supply Roller
Replenishing Screw
Agitating Screw
Photo Conductor
Transfer Belt
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