Canon W6400 Series Service Manual page 66

Chapter 2
Start cut sheet feeding
sensor calibration
Paper width detection
edge detection (start)
Leading edge detection
Media leading edge
detection (continued)
End cut sheet feeding
d) Cut sheet feeding when skew detection is off
When skew detection is off, media width detection which is performed at the trailing edge of the media is performed simply to determine the position for
the next media leading edge detection and the actual media width used for printing is detected at the trailing edge of the media after media leading edge
detection.
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 leading edge detection and media width 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.
2-22
1) Feed the media forward and tentatively detect the media trailing edge with the media
Media trailing
sensor (temporarily stop feeding when detected).
edge detection
2) Feed the media backward and detect the media trailing edge with the media sensor
(stop feeding when detected).
1) Move the registration sensor over the media.
Registration
2) Determine the sensor output and check the sensor input value over the media checked.
3) Move the registration sensor over the platen.
4) Check the sensor input value over the platen.
This is performed each time the media is loaded since the sensor input value varies depending
on the media type.
1) Detect the media left edge (temporarily stop forward movement of the carriage when
detected).
2) Tentatively detect the media right edge (stop forward movement of the carriage when
detected).
3) Detect the media right edge (temporarily stop return movement of the carriage when
detected).
1) Move the registration sensor over the media.
Media leading
2) Feed the media 300 mm in the backward direction (stop feeding when detected).
Unable to detect
Detected
1) Feed the media
forward and detect
the media leading
edge.
1) Move the media sensor over the platen at the
Media skewing
media left edge and feed the media 50mm forward.
detection
2) Detect the left edge of the media (temporarily stop
forward movement of the carriage when detected),
compare with the media left edge determined
during media width detection and determine the
skew amount.
Print standby position
Print
1) Move the registration sensor over
Media leading edge
the platen at left edge of the media.
detection (shutdown)
1) Detect the media left edge
Media skewing detection
(temporarily stop forward movement
of the carriage when detected).
Compare with the media left edge
determined during media width
detection to determine the skewing
amount.
1) Move the media sensor to the leading
Media leading edge
edge detection interrupt position.
detection (recovery)
2) Feed the media backward and
tentatively detect the media leading
edge (stop feeding when detected).
3) Feed the media forward and detect
the media leading edge (stop feeding
when detected).
F-2-24