Skew Correction - Canon Color imageCLASS MF9170c Service Manual

Chapter 8

8.2.3 Skew Correction

imageCLASS MF9170c / imageCLASS MF9150c / imageCLASS MF8450c
Before the paper fed from the cassette or manual feed tray is transported to the ETB unit, a skew is corrected.
1) The fed paper comes into contact with the registration shutter at the registration roller assembly.
The lead edge of the paper comes into contact with the registration shutter so that the right and left edges of the paper are aligned.
2) The paper is warped because the paper path is obstructed by the registration shutter.
Since the registration shutter is pressed by springs, the registration shutter does not move only with the power of the sheet trying to move ahead.
When the paper is warped, the stiffness of the paper is applied in addition to the power of trying to move ahead, which increases the power of lifting up the
registration shutter.
3) When the power exceeding a specified level is applied to the paper, the registration shutter is lifted up.
In this condition, the paper is transported while keeping the right and left edges being aligned, and the skew is corrected.
8-6
Paper feed direction
Registration shutter
Paper
F-8-6
Registration shutter
Paper
0019-5030