Sharp AR-6020V Service Manual page 111

5) Paper feed start (2nd sheet)
6) Scanning complete (1st sheet)/Registration operation (2nd
sheet)
(When a certain time passes after turning ON the registration
clutch, the paper feed clutch is turned OFF.)
7) Scanning start (2nd sheet)
8) Paper exit complete (1st sheet)
9) Scanning complete (2nd sheet)
10) Paper exit complete (2nd sheet)
11) Pick-up roller lifting up
(After completion of a job, the paper feed clutch is ON, then,
the paper exit motor is rotated reversely at a low speed for a
certain time to lift the pickup roller.)
AR-6020V OPERATIONAL DESCRIPTIONS 11 – 4
c. Duplex scanning
Images on the document surface are scanned, and detection of the
rear edge of the document by sensor SPPD3 triggers the following.
That is, when the rear edge of the document passes the reverse
gate, the transport motor is reversed.
Due to the above operation, the paper exit roller is reversed to
switchback the document, returning it to the registration roller sec-
tion and aligning (registration) the document.
Then the transport motor is rotated normally to transport the docu-
ment to the scanning section, scanning images on the back sur-
face.
To reset the page order of the documents, the following operations
are made which are triggered by the detection of the rear edge of
the document. That is, when the rear edge of the document passes
the reverse gate, the transport motor is reversed.
Due to the above operation, the paper exit roller is reversed to
switchback the document, returning it to the registration roller sec-
tion and aligning (registration) the document.
Then the transport motor is rotated normally to transport the docu-
ment to the paper exit section and discharge it.
When a duplex document is scanned, the document lead edge sec-
tion and the rear edge section intersect. At that timing, the paper
exit roller pressure release solenoid is turned OFF to make a gap
between the paper exit roller (drive) and the paper exit roller (idle).
During the time from when the document rear edge passes the
scanning section to when it is switch backed and send to the regis-
tration roller section, the paper exit roller pressure release solenoid
is turned ON to keep the paper exit roller (drive) and the paper exit
roller (idle) in contact.
1) Document set (Document empty sensor ON)
2) Paper feed start (1st sheet)
Pick-up roller descending
3) Registration operation (1st sheet, front surface)
4) Scanning start (1st sheet, front surface)
5) After completion of scanning, the reverse follower roller is
pressed. (Solenoid ON)