Canon W6400 Series Service Manual page 65

Start roll media feeding
Paper width detection
Media skewing detection
End roll media feeding
Cut sheet feeding is performed mainly when skew detection is on and when skew detection is off. For media feeding when skew detection is on, media
width detection is performed at the trailing end of the cut media. For media feeding when skew detection is off, media width detection is performed at the
leading end of the cut sheet without performing skew detection.
c) Cut sheet feeding when skew detection is on
Cut sheets that are loaded on the platen are transported by the feed rollers.
When cut sheets are loaded with the cut sheet option selected, the upper cover is closed by returning the media release lever, and then the sheet type is set,
the feed motor turns forward and the media sensor detects the trailing edge of the cut sheets loaded on the platen.
After calibrating the registration sensor in this state, media width detection, media leading edge detection, and skewing detection are performed and then
the cut sheet is stopped at the print standby position.
The cut sheets are then fed by a length equivalent to the margin of the leading edge, and printing is started. Feeding of the cut sheets during printing is
performed by controlling the rotation of the feed rollers according to the printing mode.
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 the 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 media edge threshold.
Perform the following to accurately detect the barcode pattern printed on the leading edge of
Media edge
the media.
tentative detection 1) Drive the carriage and move the registration sensor over the media.
2) Drive the carriage and detect the media left edge (momentarily stop carriage return
movement when detected).
3) Drive the carriage and move the registration sensor to position over the media.
4) Feed the media backward and tentatively detect the leading edge of the media (stop
feeding when detected).
5) Drive the carriage and move the registration sensor 30mm in the forward direction from the
media left edge.(10mm in the forward direction in cutting dust reduction mode)
6) Feed the media 50mm forward.
7) Feed the media backward and detect the leading edge of the media (stop feeding when
detected).
1) Drive the carriage and feed roller and move to barcode reference pattern detection position.
Barcode
2) Drive the carriage and detect the barcode reference pattern.
3) Drive the carriage and feed roller and move to barcode data pattern detection position.
pattern detection
4) Drive the carriage and detect the barcode data pattern.
5) Repeat steps 3) and 4) five times (because the pattern has 6 lines).
6) Move the carriage to home position, drive the cap/feed roller, and feed so that the media
leading edge is 58mm* from the center of the pinch roller.
* When minimum print cut length is set to 50mm (the feed length above depends on the
media type setting).
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 the 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 skew detection precision).
1) Feed the media 241mm backward.
Cut media
2) Drive the carriage and drop the cutter in the cutter gutter.
3) Drive the carriage in the home position direction, cut the media, and store the cutter.
4) Feed the media 20mm backward.
5) Feed the media 50mm forward.
6) Feed the media 20mm backward.
7) Feed the media 140mm forward.
8) Feed the media 139mm backward.
1) Drive the carriage and move the registration sensor 30mm in the forward direction from the
Media leading
media left edge (10mm in the forward direction when in cutting dust reduction mode).
edge detection 2) Feed the media 50mm forward.
3) Feed the media backward and detect the leading edge of the media (stop feeding when
detected).
Print standby position
Print
F-2-23
Chapter 2
2-21