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 reversing unit 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 reversing unit, the support member being protruded in the first conveyance direction from the apparatus body in the space above the stack portion;
• a discharging unit configured to discharge a discharging sheet from the apparatus body, the discharging unit 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;
• a detector configured to output a detection signal that changes according to a pivot angle of the pivotable member;
• and
• a cover member constituting an upper surface of the apparatus body,
• 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,
• 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,
• wherein the support member is provided with an opening portion penetrating the support member in a vertical direction,
• wherein the support member protrudes further downstream of a downstream end of the cover member in the first conveyance direction,
• wherein the pivotable member includes an inner part that is configured to enter inside the opening portion in a state where the pivotable member overlaps the support member when viewed in the sheet width direction, and
• wherein when viewed from above, the opening portion has a recessed shape in which a part, in the sheet width direction, of a downstream end of the support member in the first conveyance direction is recessed toward an upstream side in the first conveyance direction.