Sheet discharge apparatus and image forming apparatus

A sheet discharge apparatus comprising:

• a stack portion on which a sheet discharged from an apparatus body is stacked;
• a reverse conveyance roller pair configured to reverse a reversing sheet by conveying the reversing sheet such that the reversing sheet is protruded from the apparatus body in a first conveyance direction toward a space above the stack portion and then conveying the reversing sheet in a second conveyance direction opposite to the first conveyance direction;
• a support member configured to support a lower surface of the reversing sheet being conveyed by the reverse conveyance roller pair, the support member being protruded in the first conveyance direction from the apparatus body in the space above the stack portion;
• a discharge roller pair configured to discharge a discharging sheet from the apparatus body, the discharge roller pair being arranged such that the discharging sheet passes below the support member;
• a pivotable member arranged above the stack portion, positioned below the support member in a state where the pivotable member is not abutted by the discharging sheet, and configured to pivot upward by being abutted by the discharging sheet so that the pivotable member is in an upward position;
• and
• a detector configured to output a detection signal that changes according to a pivot angle of the pivotable member,
• wherein the pivotable member is arranged downstream of the reverse conveyance roller pair with respect to the first conveyance direction,
• wherein when viewed in a sheet width direction perpendicular to the first conveyance direction, a pivoting locus in which the pivotable member pivots overlaps the support member, and
• wherein when viewed in the sheet width direction in a state where the pivotable member is in the upward position, a part of an upper surface of the pivotable member and a part of a lower surface of the support member are in same position with respect to a horizontal direction, and the part of the upper surface of the pivotable member is higher than the part of the lower surface of the support member.