Sheet feeding device and image forming apparatus
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United States of America Patent
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Feb 26, 2013
Grant Date -
Jun 14, 2012
app pub date -
Dec 5, 2011
filing date -
Dec 8, 2010
priority date (Note) -
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Abstract
A sheet feeding device may include a tray, a sheet feeder, a pressurizing unit, a height detection unit, a weight detection unit, and a control unit. The tray may be raised and lowered. The sheet feeder sends out a sheet stacked on the tray. The pressurizing unit urges the tray to pressurize the sheet stacked on the tray against the sheet feeder. The control unit adjust pressure force of the pressurizing unit per change in height of sheets stacked on the tray on a basis of weight per unit height of the sheets, calculated on a basis of an initial total weight of the sheets stacked on the tray detected by the weight detection unit before a feeding operation is started and on a basis of the initial height of sheets stacked on the tray detected by the height detection unit before a sheet feeding operation is started.
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