Sheet discharging apparatus, sheet processing apparatus, and image forming system

A sheet discharging apparatus comprising:

• a guide member configured to guide a lower surface of a sheet that is discharged;
• a discharge roller pair including an upper roller configured to be in contact with an upper surface of the sheet and a lower roller configured to be in contact with the lower surface of the sheet, the discharge roller pair being configured to discharge the sheet in a sheet discharge direction by nipping the sheet with the upper roller and the lower roller;
• a stacking portion on which the sheet discharged by the discharge roller pair is stacked;
• and
• a first moving member and a second moving member each configured to move to a first position and a second position, the first position being a position where the first moving member and the second moving member protrude downstream of the discharge roller pair in the sheet discharge direction, the second position being a position located upstream of the first position in the sheet discharge direction, the first moving member and the second moving member being disposed separately from each other in a sheet width direction perpendicular to the sheet discharge direction,
• wherein each of the first moving member and the second moving member includes a support portion configured to support the lower surface of the sheet sent from the discharge roller pair, and
• wherein the support portions of the first moving member and the second moving member in the first position protrude upward in a height direction with respect to a tangent of the lower roller as viewed in the sheet width direction, the height direction being a direction orthogonally intersecting with both of the sheet discharge direction and the sheet width direction, the tangent of the lower roller being a straight line that is parallel to the guide member, is tangent to an outer peripheral surface of the lower roller, and passes above a rotational axis of the lower roller.