Patent ID: 8220796

Claim:
A sheet output device configured to output a sheet comprising: a sheet receiver; and a group of rollers including: a plurality of output rollers arranged in a widthwise direction of the sheet; a plurality of pinch rollers arranged above the plurality of output rollers, each of the plurality of pinch rollers being configured to pinch the sheet with a corresponding one of the plurality of output rollers and to transport the sheet onto the sheet receiver; and at least one corrugation roller arranged coaxially with the output rollers, the at least one corrugation roller being disposed between two corresponding output rollers of the plurality of output rollers and having a diameter larger than the plurality of output rollers, wherein the plurality of output rollers are configured to be rotatable relative to the at least one corrugation roller, wherein the at least one corrugation roller is configured to rotate independently of the plurality of output rollers by being pushed by a leading end of the transported sheet.