Patent ID: 8128082

Claim:
A sheet feeding device comprising: a sheet storing unit in which sheets are stacked and stored; a lifting unit that lifts and lowers the sheets stacked in the sheet storing unit; an air blowing unit that blows air to end faces of the stacked sheets; a feeding roller that is pressed against an upper surface of a first sheet and feeds the first sheet by rotating, the first sheet being an uppermost sheet of the sheets stacked in the sheet storing unit; and a supplying roller that transports the first sheet, which is fed from the feeding roller, wherein the lifting unit is driven so that the height of the first sheet, which is fed by the feeding roller while air is blown by the air blowing unit, is set to be lower than the height of the first sheet, which is fed by the feeding roller while air is not blown by the air blowing unit, and a detecting unit that detects a position of an upper surface of the stacked first sheet, wherein a driving control of the lifting unit, when the sheets are fed while air is blown, is performed based on detection result of the position of the upper surface of the first sheet, the detection result being obtained while air is blown to the stacked sheets, wherein the detecting unit detects the position of the upper surface of the stacked first sheet by referring a position of the feeding roller, which is pressed against the sheets floating because of air blowing, in a vertical direction.