Paper Loop Amount Control Before Fixing - Canon imageRUNNER 2530 Service Manual

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Technology > Fixing System > Controls > Paper loop amount control before fixing

Paper loop amount control before fixing

Purpose:
To get a proper image by avoiding a shock when the trailing edge of paper comes out
of the registration roles, an appropriate paper loop is formed between transfer roller
and fixing roller.
Pressure roller
Fixing film
Drum
Loop sensor(S6)
Registration
roller
Transfer roller
Starting conditions:
This control is performed at every paper feeding.
Operation:
The fixing motor drive speed is controlled as follows by detecting the paper loop
between transfer roller and fixing roller with the loop sensor.
1) The fixing motor drive speed is reduced by 3.1% when the reading edge of paper is
fed 35mm from the transfer roller. The reduced speed is kept until the loop sensor is
turned on by the formed paper loop.
2) After detecting the ON condition of the loop sensor for 50 msec continuously, the
fixing motor drive speed is increased by 0.8% compared with the process speed.
The increased speed is kept until the loop sensor is turned off by the deleted paper
loop.
3) After detecting the OFF condition of the loop sensor for 50 msec continuously, the
fixing motor drive speed is reduced by 3.1% compared with the process speed. The
2 Technology > Fixing System > Controls > Paper loop amount control before fixing
4) Repeat steps 2) and 3). The fixing motor drive speed is increased by 0.8%
5) When continuously making prints, return to step 1). When making a single print,
Sensor: OFF
Sensor: ON
F-2-75 F-2-75
reduced speed is kept until the loop sensor is turned on by the formed paper loop.
compared with the process speed when the trailing edge of paper reaches 65 mm
before coming out of the registration roller.
shift to the last rotation.
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