Pre-Fixing Arch Level Control - Canon imageRUNNER 1750 Series Service Manual

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Technical Explanation > Fixing System > Controls > Pre-fixing arch level control

■ Pre-fixing arch level control

Purpose:
Constantly creating an optimal arch between the transfer and fixing areas prevents a
shock, which occurs when the paper's trailing edge passes through the Registration
Roller, and obtains an optimal image.
Fixing Film
Pressure Roller
Photosensitive Drum
Arch Sensor (PS9)
Transfer Roller
Registration Roller
2 Technical Explanation > Fixing System > Controls > Pre-fixing arch level control
Starting conditions:
This control is performed every time the paper is fed.
Operation:
The Arch Sensor detects a paper arch between the transfer nip and fixing nip to
change the drive speed of the Fixing Motor.
1) When the paper's leading edge goes over 35mm from the Transfer Roller, drive speed
of the Fixing Motor is reduced by 3.1% against the process speed. The reduced speed
is maintained until the paper creates an arch and the Arch Sensor is turned ON.
2) After the Arch Sensor has been detected ON for consecutive 50msec or longer,
drive speed of the Fixing Motor is increased by 0.8% against the process speed. The
increased speed is maintained until the paper arch disappears and the Arch Sensor is
turned OFF.
loop.
Sensor: OFF
3) After the Arch Sensor has been detected OFF for consecutive 50msec or longer, drive
speed of the Fixing Motor is reduced by 3.1% against the process speed. The reduced
speed is maintained until the paper creates an arch and the Arch Sensor is turned ON.
4) Repeat steps 2) and 3). When the paper's trailing edge reaches at 10mm before
the Transfer Roller, drive speed of the Fixing Motor is increased by 0.8% against the
process speed.
5) Go back to step 1) in the case of continuous printing. The machine goes to the last
rotation operation in the case of 1 sheet print.
Sensor: ON
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