Sheet output device and original sheet transporting device

An original sheet transporting device comprising:

• an input tray on which an original sheet is stacked;
• a sheet output device;
• and
• a feed mechanism configured to feed the original sheet from the input tray to the sheet output device,
• wherein the sheet output device comprises:
• 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 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 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.