Image forming apparatus and image forming method

Details Image forming apparatus and image forming method Image forming apparatus and image forming method

2011-03-22

2011-03-22

Karmis, Stefanos (Department: 3653)

Sheet feeding or delivering

Feeding

Separator and conveyor

C271S004020, C271S010010

Reexamination Certificate

active

07909319

ABSTRACT:
To provide an image forming apparatus and image forming method that can prevent a decrease in image quality by preventing a step-out of a driving source, which occurs because a load of a feeding device is applied when a medium is transported for image formation.When no roller reset operation, by which a paper feed roller is returned to a reset position, is performed (YES in S21), it is judged whether a counted value N of a counter, which indicates a position of a sheet of paper, is below a threshold value Na, which indicates that it is in an A region in which a load of a hopper or paper return levers of an automatic sheet feeder (ASF) is applied to a stepping motor (S22). When N<Na, driving for high torque is selected (S23), and then paper transport in the A region is performed with a high torque (S25). On the other hand, when N≧Na, driving for low torque is selected (S24) and then paper transport in a B region after the A region has passed is performed with a low torque (S25). When the position of a sheet of paper passes a boundary between the A region and the B region, paper transport is performed with a high torque.

REFERENCES:
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patent: 2006/0071416 (2006-04-01), Mizuno
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patent: 2005-231845 (2005-09-01), None
patent: 2006-089221 (2006-04-01), None

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