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ENWW Automatic duplex unit (ADU) 109
MFP unit explanation
The paper fed from the ADU paper reversal
section is fed by transmitting the drive force
of M5 (conveyance) to ADU conveyance
rollers 1 to 4. Paper is then fed to the second
paper feed section by the drive force of M6
(loop roller). In the ADU conveyance section,
pre-loop control is performed to correct
paper skew forcibly. To perform this control,
MC2 (ADU deceleration) and MC13 (ADU
conveyance) are provided. Related signals
are PS41 (ADU conveyance/1), PS45 (ADU
paper reverse), PS46 (reverse/exit), PS48
(ADU paper conveyance/2), PS49 (ADU
deceleration), and PS50 (ADU
pre-registration). SD9 (ADU lock) is provided
to lock the handle of the ADU.
1 Operation
a ADF conveyance control
The paper fed from the ADU paper
reversal section is fed to ADU
pre-registration rollers at a high speed
by transmitting the drive force of M5
(conveyance) to ADU conveyance
rollers 1 to 4. ADU conveyance rollers 1
and 2 are turned on/off by MC13 (ADU
conveyance) and ADU conveyance
rollers 3 and 4 are controlled by MC2
(ADU deceleration). After a lapse of the
specified time from turning on of PS49
(ADU deceleration), MC2 and MC13 are
turned off to press the paper against the
ADU pre-registration roller, forming a
paper loop.
MC13 is turned on/off only when the
paper length is 325 mm or longer. If the
paper length is less than 325 mm, it
stays on during copying.
b ADF feed control
M6 (loop roller) starts rotating at a high
speed after a lapse of the specified time
from detection of the leading edge of
paper by PS50 (ADU pre-registration).
Thus, the ADU pre-registration roller
starts rotating to feed paper to the
second paper feed section. At this time,
MC2 (ADU deceleration) and MC13
(ADU conveyance) are turned off so
that the drive force of M5 (conveyance),
which is also used to drive the second
paper feed section, is not transmitted to
ADU conveyance rollers 1, 2, 3, and 4.
MC2 and MC13 are turned on after a
lapse of the specified time from
detection of the trailing edge of paper by
PS49 (ADU deceleration), proceeding
to feed the next sheet of paper.
After a lapse of the specified time from
detection of the leading edge of paper
by PS44 (registration), M6 starts
rotating at a low speed. MC1
(registration) is turned on after formation
of a paper loop by the registration roller,
thus writing the image on the back side.
c ADF lock control
The ADU handle is locked by SD9 (ADU
lock). PS47 (ADU handle) detects the
handle position to determine whether
the handle is locked or released.
2 Signals
a Input signals
1 ADU_JAM (PS41 to ADUSDB)
Detection signal of paper passage
from exit of ADU conveyance roller 1
[L]: Detected
[H]: Not detected
2 HD_PS (PS47 to ADUDB)
ADU handle position detection signal
[H]: Handle is released.
3 ADUCR_PS (PS48 to ADUDB)
Detection signal of paper passage
from exit of ADU conveyance roller 2
[L]: Detected
[H]: Not detected