Patent ID: 8382097

Claim:
A sheet feeding device to feed a sheet, the sheet feeding device comprising: a tray configured to carry a stack of sheets, including the sheet, and be raised and lowered; a sheet feeder configured to send out the sheet stacked on the tray; a pressurizing unit configured to urge the tray to pressurize the sheet stacked on the tray against the sheet feeder; a height detection unit configured to detect height of sheets stacked on the tray; a weight detection unit configured to detect weight of the stacked sheet; and a control unit configured to adjust pressure force of the pressurizing unit in accordance with change in height of sheets stacked on the tray on a basis of weight per unit height of the sheets calculated in a following manner: weight per unit height of the stacked sheets is 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.