Service manual

ADU
2-N-7
2 UNIT EXPLANATION
*9 Nonstack paper feed mechanism
In the two-sided copy mode, the paper fed from
the paper reverse/exit section is conveyed to the
ADU section by the ADU reverse roller. When
PS58 (ADU paper reverse) detects the trailing
edge of paper and consequently turns OFF, the
ADU reverse roller starts rotating in the opposite
direction, feeding the paper backward. The fed
back paper is conveyanceed to the ADU horizon-
tal conveyance roller, not the paper reverse/exit
roller 3, because of the shape of the conveyance
path plate. Thus, paper is reversed and fed to the
ADU exit, sheet by sheet, without being stacked.
*10 ADU pre-registration mechanism
In the ADU, paper is looped by the pre-registra-
tion roller and pre-registration loop roller to cor-
rect paper inclination in the second paper feed
unit. The pre-registration roller is controlled by
the ON/OFF operation of MC2 (ADU pre-regis-
tration MC). The pre-registration loop roller feeds
paper at a constant speed with the pre-registra-
tion roller stopped by the OFF operation of MC2,
forming a paper loop between these two rollers.
As a result, paper inclination is corrected. When
MC2 is turned ON, the pre-registration roller
starts rotating to feed paper to the second paper
feed section. Note that the pre-registration loop
roller is rotating at a constant speed and it does
not stop after formation of a paper loop is com-
plete. Therefore, the loop size depends on the
time from turning ON to OFF of MC2.
PS58 (ADU paper reverse)
ADU reverse roller
ADU
horizontal
conveyance roller 1
ADU horizontal
conveyance roller 2
Pre-registration
loop roller
PS58 (ADU paper reverse)
ADU reverse roller
ADU
horizontal
conveyance roller 1
ADU horizontal
conveyance roller 2
Pre-registration
loop roller
ADU horizontal
conveyance roller 2
Pre-registration roller
Paper looping position
Pre-registra-
tion roller
ADU exit
roller
Loop roller
Registration roller
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