Skew Detection - Canon BJ-W3000 Service Manual

3. Skew detection

By comparing the detected right edge position of the paper after a certain volume of paper has
been fed, with the position of the right edge detected during the paper width detection operation,
paper skew can be detected.
[1] Roll media
After the paper width detection, the paper is fed for approximately 300mm to detect skew.
[2] Cut sheets
After the paper width detection, the paper is reverse fed for approx. 300mm for the first skew
detection. The paper is then fed further back, and when the rear edge passes the media sensor,
the paper is fed back for approx. 50mm from the leading edge and a second skew detection takes
place.
However, if the leading edge passes by the media sensor before the paper is fed for approx.
300mm, the paper is returned approx. 50mm from that position, and skew detection is conducted.
Approx. 300mm
Approx. 50mm
Roll media
Skew detection
300mm
Paper width detection
Figure 2-206
Cut sheet
Paper width detection
Skew
detection 1
Skew
Approx.
detection 2
50mm
Figure 2-207
CHAPTER 2. BASIC OPERATION
Paper width detection
Skew detection
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