Paper loop amount control before fixing

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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.
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 4.5% 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 1.4% 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 4.5% compared with the process speed. The reduced speed is kept until the loop sensor is turned on by the formed paper loop.
4) Repeat steps 2) and 3). The fixing motor drive speed is increased by 0.9% compared with the process speed when the trailing edge of paper reaches 65 mm before coming out of the registration roller.
5) When continuously making prints, return to step 1). When making a single print, shift to the last rotation.