Sheet discharging apparatus and image forming apparatus

A sheet discharging apparatus comprising:

• a discharging portion configured to discharge a sheet;
• a stacking portion on which the sheet discharged by the discharging portion is stacked;
• a moving member configured to abut against the sheet stacked on the stacking portion and move to a first position, a second position, and a third position that is farther from the first position than the second position is;
• a detection portion configured to detect a position of the moving member;
• and
• a control portion configured to control the discharging portion,
• wherein the moving member is configured to move from the first position toward the second position and the third position as a height of sheets stacked on the stacking portion increases,
• wherein in a case where the detection portion detects that the moving member has reached the second position, the control portion controls the discharging portion in a first mode or a second mode, the first mode being a mode in which the control portion restricts discharge of a sheet performed by the discharging portion, the second mode being a mode in which the control portion allows the discharging portion to continue to discharge sheets even if the moving member is located between the second position and the third position,
• wherein in the second mode, the control portion restricts the discharge of a sheet after a predetermined number of sheets has been discharged to the stacking portion by the discharging portion since the detection portion detected that the moving member had reached the second position, and
• wherein the control portion is configured to determine the predetermined number of sheets, depending on a type of the sheet discharged by the discharging portion, a length of the sheet in a sheet conveyance direction, and temperature and/or humidity.