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Canon W6400 Series Service Manual Page 64

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Chapter 2
when replacing the media, since the roll media may have a barcode pattern containing media information at the leading edge of the media, the barcode
pattern is read and then cut after feeding the media if the option to cut is enabled.
* If the cutter is disabled, the location where the media should be cut is set as the leading edge and feeding ends.
* If skew detection is disabled, skew detection is not performed during the feeding sequence.
a) Roll media feeding when the power is on
The load command is executed when the printer power is turned on while the roll media is set.
After calibrating the registration sensor, media width detection, skewing detection, and media leading edge detection are performed and then the roll media
is stopped at the print standby position.
The roll media is then fed by a length equivalent to the margin of the leading edge, and printing is started. Feeding of the roll media during printing is
performed by controlling the rotation of the feed rollers according to the printing mode.
Start roll media feeding
Paper width detection
Media skewing detection
End roll media feeding
b) Roll media feeding during media replacement
When replacing the media, the user adjusts the skew of the roll media on the platen and then presses a key on the control panel to feed the media.
When replacing the media, barcode data is always scanned before feeding because a barcode pattern (media information) may be printed on the leading
edge of the media.
If media information is detected after barcode data scanning, the leading edge of the media is cut.
After calibrating the registration sensor, media end temporary detection, barcode pattern detection, media width detection, skewing detection, media
cutting, and media leading edge detection are performed and then the roll media is stopped at the print standby position.
2-20
1) Feed 99mm forward from the media set position.
Registration
2) Drive the carriage and move the registration sensor over the media.
sensor calibration
3) Determine sensor output and check the registration sensor input value over the media.
4) Drive the carriage and move the registration sensor over the platen.
5) Check the sensor input value over the platen.
6) Determine the sheet edge threshold.
7) Retract the head from the media (to prevent head wear).
8) Feed the media 99mm backward.
1) Feed the media 99mm forward.
2) Drive the carriage and move the registration sensor over the media.
3) Drive the carriage and detect the media left edge (momentarily stop carriage return
movement when detected).
4) Drive the carriage and move the registration sensor to position over the media.
5) Drive the carriage and tentatively detect the media right edge (momentarily stop carriage
forward movement when detected).
6) Drive the carriage and move the registration sensor to media right edge detection start
position (30mm inside the media right edge tentative detection position: on media).
7) Drive the carriage and detect the media right edge (momentarily stop carriage forward
movement when detected).
1) Drive the carriage and feed roller and move the registration sensor to media left edge
detection start position.
2) Drive the carriage and detect the media left edge (stop carriage return movement when
detected), compare with media right edge determined during media width detection, and
determine the skew amount (skew amount depends on the detection precision).
1) Feed the media 300mm backward.
Media leading
2) Drive the carriage and move the registration sensor 30mm in the forward direction from the
edge detection
media left edge (10mm in the forward direction when in cutting dust reduction mode).
3) Feed the media 50mm forward.
4) Feed the media backward and detect the leading edge of the media (stop feeding when
detected).
Print standby position
Print
F-2-22

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