Patent ID: 8590886

Claim:
An air-suction sheet supplying device, comprising: a sheet stacking plate to stack recording sheets; an air-suction duct, arranged to face a top surface of the recording sheet stacked on the sheet stacking plate, and having an air-suction opening with a predetermined width, wherein the air-suction duct sucks air through the air-suction opening to draw up the recording sheet; a belt member, rotatably arranged at a position to cover the air-suction opening along an outer periphery of the air-suction duct, so as to draw up and convey the recording sheet exhibiting a predetermined sheet-size among the recording sheets exhibiting various sheet-sizes, the belt member having plural areas corresponding to the sheet-sizes, wherein each of the plural areas includes suction holes, and the plural areas are arranged in a circumferential direction of the belt member, wherein distributions of the suction holes are different with respect to the plural areas in a direction perpendicular to a sheet conveying direction; a driving section to rotate the belt member; a detecting section to detect a position of the belt member in a rotating direction; and a control section to operate the driving section so as to set a starting position of suction work on a selected area selected among the plural areas, wherein the selected area corresponds to a selected sheet-size of the recording sheets, based on information detected by the detecting section wherein the air-suction duct is arranged in a total direction perpendicular to the conveying direction of the belt member; wherein an area of the plural areas corresponding to a first sheet-size is arranged sequentially with respect to an area of the plural areas corresponding to a second sheet-size.