Sheet discharging device, image forming system, and sheet discharging method

A sheet stacking device comprising:

• a discharging unit configured to discharge a sheet from a discharging port;
• a tray unit on which the discharged sheet is stacked;
• and
• a pair of air blowers located at respective outer lateral edges of the tray unit, the pair of air blowers being configured to send air toward a sheet discharging side while the sheet is discharged, wherein
• each air blower includes a blowing duct adjacent the discharging port,
• the blowing duct includes a blowing port and a louver,
• each of the pair of air blowers has an inclined inner surface so that the air is sent obliquely upward to a lower surface of the sheet being discharged,
• each of the air blowers is configured to send the air toward a center from both ends in a width direction of the sheet so the air joins or crosses at a point, and
• the point is located on a leading end of the sheet stacked on the tray unit or near the leading end.