Rotatable tray for sheet processing apparatus

An image forming system comprising a sheet processing apparatus, wherein the sheet processing apparatus comprises:

• an ejecting unit configured to eject a sheet or a bundle of sheets;
• a sheet stacking unit configured to stack the sheet or the bundle of sheets ejected by the ejecting unit;
• and
• a sheet conveying unit on a front surface of the sheet stacking unit,
• wherein
• the leading end portion of the sheet stacking unit on the downstream side in the sheet conveying direction is rotatable downward and capable of dropping down the sheet or the bundle of sheets stacked on the sheet stacking unit from the leading end portion of the sheet stacking unit, and
• the sheet stacking unit includes a sheet stacking auxiliary surface whose end portion on the downstream side in the sheet conveying direction is positioned higher than a horizontal surface of the sheet stacking unit.

A sheet processing apparatus comprising:

• an ejecting unit configured to eject a sheet or a bundle of sheets;
• and
• a sheet stacking unit configured to stack the sheet or the bundle of sheets ejected by the ejecting unit,
• wherein
• the sheet stacking unit is positioned outside of an image forming system,
• the stacking unit includes a sloped surface, a horizontal surface provided along the sheet ejecting direction, and a curved surface provided between the sloped surface and the horizontal surface,
• the leading end portion of the sheet stacking unit on the downstream side in the sheet conveying direction is rotatable downward and capable of dropping down the sheet or the bundle of sheets stacked on the sheet stacking unit from the leading end portion of the sheet stacking unit, and
• the sheet stacking unit includes a sheet stacking auxiliary surface whose end portion on the downstream side in the sheet conveying direction is positioned higher than a horizontal surface of the sheet stacking unit.