Patent ID: 8256769

Claim:
A feeding device, comprising: a feed roller group including at least two feed rollers rotatable around an axis perpendicular to a sheet feeding direction; a first roller group including at least two first rollers rotatable along with the feed rollers, and operative to convey the sheet with the feed roller to a first direction; and a second roller group including at least two second rollers rotatable along with the feed rollers, and operative to convey the sheet with the feed rollers to a second direction opposite to the first direction, wherein at least one of the first rollers includes a first asymmetric roller having a first contact region that is in contact with the feed roller and a first noncontact region that is not in contact with the feed roller, the first noncontact region being arranged at an end of the first roller in a first axial direction of a rotating shaft of the feed rollers, at least one of the second rollers includes a second asymmetric roller having a second contact region that is in contact with the feed roller and a second noncontact region that is not in contact with the feed roller, the second noncontact region being arranged at an end of the second roller in a second axial direction of the rotating shaft of the feed rollers, the first asymmetric roller includes a first large-diameter portion provided on the first noncontact region and having a diameter larger than a diameter of a first small-diameter portion provided on the first contact portion, the first large-diameter portion being arranged relatively toward a center position of the sheet along the rotating shaft; and the second asymmetric roller includes a second large-diameter portion provided on the second noncontact region and having a diameter larger than a diameter of a second small-diameter portion provided on the second contact portion, the second large-diameter portion being arranged relatively away from the center position of the sheet along the rotating shaft.