Sheet bundle discharging apparatus

A sheet bundle discharging apparatus configured to discharge a sheet bundle including a spine, the sheet bundle discharging apparatus comprising:

• a conveyance unit configured to convey the sheet bundle;
• a guide unit configured to guide the sheet bundle conveyed by the conveyance unit so that the spine is located at a leading end;
• a receiving unit configured to receive the spine of the sheet bundle guided by the guide unit;
• and
• a discharging unit configured to discharge the sheet bundle to an outside of the sheet bundle discharging apparatus,
• wherein the receiving unit is rotatable between a first position and a second position,
• wherein the receiving unit receives the spine at the first position,
• wherein the receiving unit rotates from the first position to the second position to place the sheet bundle on the discharging unit,
• wherein the receiving unit includes:
• a first surface against which the spine abuts when the receiving unit receives the spine at the first position;
• a second surface on which the sheet bundle is slidable before the spine abuts against the first surface, the second surface being configured to push the sheet bundle in a rotation direction of the receiving unit while the receiving unit rotates from the first position to the second position;
• and
• a third surface which is arranged so as to be opposed to the second surface, the thirst surface being configured to regulate a movement of the sheet bundle in the rotation direction of the receiving unit while the receiving unit rotates from the first position to the second position, and
• wherein a friction coefficient between the sheet bundle and the third surface in a direction away from the first surface on the third surface is larger than a friction coefficient between the second surface and the sheet bundle.