Canon imageRUNNER ADVANCE C5051 Series Service Manual page 91

2
Technology■>■Image■Formation■System■>■Controls■>■Transfer/separation
● Drum■rotation■speed■control ■
This■control■is■performed■to■keep■a■uniform■drum■rotation■speed■in■order■to■increase■accuracy■
of■the■image■position■(color■displacement).
Execution■timing
1)■The■drum■rotates,■driven■by■the■drum■motors■(M1■to■M4).■
2)■There■is■an■encoder■on■the■drum■shaft,■of■which■rotation■is■monitored■by■the■two■sensors■(Y:■
UN31/32,■M:■UN33/34,■C:■UN35/36,■Bk:■UN37/38,).■
3)■This■sensor■counts■the■drum■count■based■on■a■pulse,■and■feeds■back■the■drum■rotation■
speed■to■the■drum■DC■controller■to■perform■speed■control.
Drum motor
(M1~M4)
DC controller (UN1)
2 Technology■>■Image■Formation■System■>■Controls■>■Transfer/separation
Photosensitive drum
Drum rotation sensor2
(UN32 / 34 / 36 / 38)
Drum rotation sensor1
(UN31 / 33 / 35 / 37)
F-2-81
■ Transfer/separation ■
● Overview ■
Drive roller
(steering roller)
ITB Cleaning
blade
Waste toner
feeding screw
Primary transfer
auxiliary roller
Primary transfer
Tension roller
Primary transfer
roller
roller
(M)
(Y)
Toner■on■the■photosensitive■drum■is■transferred■on■paper
Parts■name
ITB■unit To■transfer■toner■on■the■photosensitive■drum■to■the■paper
■■■■■ ITB■(Intermediate■Transfer■Belt) To■transfer■toner■on■the■photosensitive■drum
Primary■transfer■roller To■attract■toner■on■the■photosensitive■drum■to■the■ITB
Primary■Transfer■Auxiliary■Roller To■make■the■contact■surface■of■Primary■Transfer■Roller■(Y)■with■
the■ITB■horizontal.
Static■eliminator To■drive■ITB.■To■correct■the■displacement■of■ITB.
ITB■scraper To■scrape■toner■inside■the■ITB
Tension■roller To■keep■appropriate■tension■of■the■ITB
Cleaning■blade To■scrape■toner■on■the■ITB
Waste■toner■feeding■screw To■feed■residual■toner■inside■the■ITB■cleaner■unit
Secondary■transfer■unit To■transfer■toner■on■the■ITB■to■the■paper
■■■■■ Secondary■transfer■outer■roller To■attract■toner■on■the■ITB■to■the■paper■and■feed■the■paper
Static■eliminator To■eliminate■electric■charge■on■the■paper■after■secondary■
transfer
2-55
Post-secondary transfer
static eliminator
ITB scraper
Secondary transfer
Primary transfer
Primary transfer outer roller
roller
roller
(Bk)
(C)
Function
T-2-35
2-55
F-2-82