Warp Control - Canon imageRUNNERC1022 Service Manual

9.2.8 Warp Control

imageRUNNER C1022 / imageRUNNER C1022i / Color imageRUNNER C1030 / Color imageRUNNER C1030iF
To prevent an image failure, it is necessary to keep the paper warped at an appropriate level between the fixing assembly and the ETB.
When the paper transport speed of the pressure roller is slower than that of the ETB, the paper warp increases, and an image defect or paper crease occurs. Con-
versely, the speed is faster than that of the ETB, the paper is pulled by the pressure roller, and a color displacement occurs in the sub-scanning direction.
The machine controls the rotational speed of the fixing motor (M1), which drives the pressure roller, to keep an appropriate level of paper warp.
When the paper is warped, the paper loop flag is pressed up, and the paper loop sensor (SR6001) is turned ON. In this case, the DC controller increases the rotational
speed of the fixing motor.
When the paper loop sensor is turned OFF, the DC controller determines that the level of paper warp is small and decreases the rotational speed of the fixing motor.
Fixing sleeve
Fixing pressure roller rotational speed is faster
than ETB feeding speed.
MEMO:
If there are appropriate distance between the transfer unit and the fixing assembly in the product, this control is not necessary to make paper warped.
However, since the machine performs vertical feeding and it is necessary to minimize its height, no distance can be secured between the transfer unit and the fixing
assembly. Therefore, it is necessary to perform warp control.
Fixing pressure roller
Paper loop sensor
Paper loop flag
Paper
ETB
Fixing pressure roller rotational speed is slower
than ETB feeding speed.
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Chapter 9
0019-5032
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