Air blowing apparatus and air blowing method with surfaces having curvatures

An air blowing apparatus comprising:

• a paper stack accommodating section which forms a paper stack accommodating space for accommodating a stack of paper;
• and
• an air blowing device which blows air toward an edge of each sheet of paper of the stack of paper accommodated in the paper stack accommodating space,
• wherein the paper stack accommodating section includes a curved surface which faces a paper surface of the stack of paper, and the curved surface extends in an air blowing direction of the air blowing device and has a curvature in a direction perpendicular to the air blowing direction of the air blowing device,
• the paper stack accommodating section includes a plurality of curved surfaces which respectively face paper surfaces of the stack of paper and have a same direction of curve, the paper stack accommodating space being sandwiched between the plurality of curved surfaces, and
• the plurality of curved surfaces have substantially same finite curvatures.

An air blowing method comprising the steps of:

• accommodating a stack of paper in a paper stack accommodating space sandwiched between a first surface and a second surface opposing the first surface, the first surface extending in a first direction and having a curvature in a second direction perpendicular to the first direction;
• and
• blowing air toward an edge of each sheet of paper of the stack of paper in the first direction, by an air blowing device, wherein
• the first surface and the second surface have substantially same finite curvatures.