Patent ID: 8210518

Claim:
A sheet-supplying device, comprising: a sheet stacking plate on which plural sheets are stacked; an air-suction sheet conveying mechanism which draws up a sheet and conveys the sheet; an air-suction detecting sensor which detects that the sheet has been drawn up by the air-suction sheet conveying mechanism; a floating-air blowing section which blows air against side edges of the sheets stacked on the sheet stacking pate to float the sheet; and a control section which controls the floating-air blowing section to conduct a supplying operation of the sheet; wherein the control section selects a first sheet supplying mode or a second sheet supplying mode, based on at least one of information of a size of the sheets; wherein the air-suction sheet conveying mechanism is actuated; and information of a thickness of the sheets, and information of a type of the sheets, wherein the first sheet supplying mode functions in such a way that when the air-suction detecting sensor detects that no sheet has been drawn up by the air-suction sheet conveying mechanism, the control section activates the floating-air blowing section to float the sheet and to conduct the supplying operation of the sheet, and the second sheet supplying mode functions in such a way that the control section activates the floating-air blowing section to float the sheet at each supplying operation of the individual sheets.