Apparatus for rotating a sheet moving in a first direction, the rotator comprising:at least one first roller that rotates against a sheet first side, the at least one first roller having a first drive;at least one second roller that rotates against the sheet first side, the at least one second roller having a second drive that is capable of rotating the second roller independently of the first roller, the second roller being spaced a distance from the at least one first roller in a direction perpendicular to the first direction; anda controller that controls the first and second drives to rotate the sheet around an axis substantially perpendicular to the plane of the sheet.