Patent ID: 7823875
Filing Date: 2010-11-02
Classification: B65H

Abstract:
1. A sheet feeding device, comprising: a tray which may be moved upward and downward in a state in which a plurality of sheets are stacked; an air blowing unit which blows air onto a sheet stacked in the tray for floating and loosening; an absorption conveying unit which absorbs and conveys a uppermost sheet of the sheets stacked on the tray floated by blowing air blown by the air blowing unit at a feed position; a sheet detection portion which detects a position of the uppermost sheet floated by blowing of the air blowing unit; a tray moving unit which moves the tray upward and downward; a tray moving amount detection portion which detects a tray moving amount caused by the tray moving unit; a sheet kind input portion through which the sheet kind is input; and a comparison portion which performs a comparison between the sheet kind input through the sheet kind input portion, and the sheet kind which is discriminated on the basis of detection by the tray moving amount detection portion, wherein the tray is moved by the tray moving unit in such a way that the uppermost sheet floated by blowing air is moved to the feed position based on detection of the sheet detection portion, and a sheet kind of the sheets on the tray is discriminated based on the moving amount of the tray detected by the tray moving amount detection portion, and a comparison result made by the comparison portion is notified when the sheet kind input by the sheet kind input portion and the sheet kind discriminated based on the detection of the tray moving amount detection portion are different from each other in the comparison result.