Canon imageRUNNER ADVANCE 4551i Service Manual page 103

■ Major Components of Image Formation System
Toner Container
Toner Feed Screw
Name
Toner cartridge
Drum unit
Brush roller
Primary charging roller
Cleaning blade
Waste toner feed screw
Photosensitive drum
Transfer roller
Developing cylinder
Developing assembly
Toner feed screw(Inside developing unit)
Toner feed screw(Inside toner feed dis-
tance)
Toner feed path
■ Image Formation Process
The image formation system of the machine mainly consists of the photosensitive drum, primary charging roller, developing
cylinder, transfer charging roller, static eliminator, and cleaning blade. The image formation process around the drum unit contains
the six blocks.
Toner Feed Path
Developing Assembly
Toner Feed Screw
Toner cartridge filled with the toner for supply
Unit consisting of the photosensitive drum, primary charging roller, etc.
Rotates in connection with the primary charging roller to clean its surface.
Rotates in connection with the photosensitive drum to cause it negatively charged.
Scrapes off the residual toner on the photosensitive drum.
Feeds the toner scraped off by the cleaning blade to the waste toner container.
Forms images on the surface of the photosensitive drum.
Applies positive charge to the back of a paper to cause the toner to be transferred to it.
Transfers the toner in the developing unit to the photosensitive drum.
Unit consisting of the developing cylinder, developing blade, etc.
Feeds the toner supplied from the toner feed distance into the developing unit.
Feeds the toner supplied from the toner cartridge to the developing unit.
A path to feed toner supplied from the Toner Container to the Developing Assembly
Brush Roller
Primary Charging Roller
Developing Cylinder
Function
90
2. Technology
Waste Toner Feed Screw
Cleaning Blade
Photosensitive Drum
Drum Unit
Transfer Roller