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Technology■>■Image■Formation■System■>■Controls■>■Image■stabilization■control
Technology■>■Image■Formation■System■>■Controls■>■Image■stabilization■control
Control■detail
1)■DC■Controller■creates■the■patch■pattern■of■each■color■on■the■ITB.
2)■DC■Controller■compares■those■patterns■with■the■standard■value■backed■up■in■the■DC■
Controller■by■reading■the■patch■sensor■(front,■center,■rear)■(UN47■to■49)■and■detects■the■
color■displacement■amount.
3)■Based■on■the■detected■result■as■above,■the■DC■Controller■executes■correction■depending■
on■the■color■displace■amount.
Control■type
Timing■to■start
Control■description
At■
power■
ON
During■
print■
for■
every■
360■
prints■
in■total
During■
print■
for■
every■
100■
prints■
in■total
Correction■in■
main■scanning■
direction
Write-start■
correction
Yes
Yes
Yes Change■write-start■timing■in■main■
scanning■direction
Correction■
of■overall■
magnification■ratio
Yes
Yes
No
Increase/reduce■the■number■of■pixels■in■
main■scanning■direction■(at■both■edges■
of■image)
Correction■of■odd■
magnification■ratio Yes
Yes
No
Increase/reduce■the■number■of■pixels■
in■main■scanning■direction■(at■center■of■
image)
Correction■in■
sub■scanning■
direction
Write-start■
correction
Yes
Yes
No Change■write-start■timing■in■sub■
scanning■direction
Correction■of■
skewed■image
Yes
Yes
No Change■position■of■laser■exposure■by■
the■laser■scanner■unit
T-2-39
■
●
ATR■control
This■control■supplies■developer■to■the■developing■assembly■to■keep■ideal■ratio■of■developer■in■
the■developing■assembly
Timing■to■start
When■replacing■with■a■new■drum■unit■(ATR■sensor)
At■every■print■(Developing■Assembly■Toner■Supply■Count,■ATR■sensor)
In■the■case■of■post-rotation■every■time■the■total■reaches■150■prints■or■continuous■print,■the■job■
is■interrupted■when■the■total■reaches■250■prints■to■execute■this■control■(patch■sensor)
Control■description
Developer■is■supplied■to■the■drum■unit■while■the■supplying■amount■of■the■developer■for■
each■color■is■calculated■by■the■above-mentioned■start■timing.■The■DC■controller■determines■
supplying■amount■of■toner■by■3■types■of■data■as■follows.
•■ Developing■Assembly■Toner■Supply■Count
•■ ATR■sensor
•■ Patch■sensor
When■the■DC■controller■determines■that■it■is■necessary■to■supply■toner,■the■developing■motors■
(M5■to■M8)■and■the■toner■supply■clutches■(CL2■to■CL5)■are■turned■ON.■This■operation■rotates■
the■toner■feeding■screw■A/B■so■that■the■specified■amount■of■developer■is■supplied■to■the■
developing■assembly.
Toner feeding
screw
Toner feeding
screwA/B
Developing assembly
Hopper assembly
Developing cylinder
Toner supply levelsensor
(PS1~PS4)
ATR sensor
(TS5
～
TS8)
CL2~CL5
M5~M8
Developing
motor
Toner supply
clutch
Patch sensor
(center)(UN49)
DC controller(UN1)
Developing assembly toner supply Count
ATR sensor Result
Patch sensor Result
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