Image-forming device and medium edge part judgment method
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United States of America Patent
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Oct 28, 2014
Grant Date -
Oct 3, 2013
app pub date -
Mar 27, 2013
filing date -
Mar 28, 2012
priority date (Note) -
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Abstract
To detect an edge part of a medium with accuracy although the medium includes a false detection element, more than one change point, which changes from a condition that an output of an optical sensor indicates existence of a print medium to a condition that the output indicates non-existence of the print medium, is detected while the optical sensor moved on the print medium along a main scanning direction. A right edge part candidate detection process and a left edge part candidate process are performed to detect at points immediately before output changes as the right and left edge part candidates of the medium when the output of the optical sensor continuously indicates a condition of non-existence of the medium while the optical sensor and the print medium are moved further along the main scanning direction for a predetermined distance from the detected change points.
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