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*1 Second paper feed paper loop mechanism
A paper loop is formed before the registration
roller to correct mis-centering of paper during
second paper feed. The paper loop is formed by
pushing the fed paper against the registration
roller for the prescribed time. The paper loop
mechanism differs between paper feed paths.
• Trays 1-3, LCT paper feed
Loop roller
• By-pass tray
By-pass feed roller
• ADU
ADU pre-registration roller
Trays 1-3/LCT
1
5
4
3
<By-pass tray>
6
8
1.
Loop formation point
2.
Feed roller (LCT)
3.
Vertical conveyance roller (upper)
4.
Loop roller
5.
Registration roller
6.
Loop formation point
7.
Feed roller
8.
Registration roller
2
7
2-N-3
<ADU>
Registration roller
Loop formation point
ADU pre-registration roller
*2 Image position correction
A leading edge PS (PS43) and paper mis-cen-
tering PS (PS70) are provided at the exit of the
registration roller, thus enhancing the positional
accuracy of the copy image.
The paper position information detected by PS43
and PS70 is processed by the image processor
to correct the image write position in such a man-
ner that the document (scanned image) position
match the copy paper position.
The leading edge PS (PS43) is used to correct
the write position in the sub-scanning direction,
and the mis-centering PS (PS70) is used to cor-
rect the write position in the main scanning direc-
tion.
ADU
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