MX-RP20. Service Manual for RP20N. - Sharp Copying Equipment Service Manual (repair manual). Page 17

MX-RP

20 N  OPERATIONAL DESCRIPTIONS  6 – 3

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 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 motor is rotated normally to transport the document to the
scanning section, scanning images on the back surface.

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 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 motor is rotated normally to transport the document 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 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)

6)

After stopping the operation, reversing is started.

7)

After reversing, registration operation is executed.

8)

After turning ON the PS clutch, the reverse follower roller pres-
sure is released.

9)

Scanning start (First sheet, back  surface)

10) After completion of scanning, the reverse follower roller is

pressed.

11) After stopping the operation, reversing is started.

12) After reversing, registration operation is executed.

13) After turning ON the PS clutch, the reverse follower roller pres-

sure is released.