Sheet ejection device, post-processing apparatus and image forming system

A sheet ejection device comprising:

• a sheet stacking section for stacking sheets ejected one by one or ejected in a form of a plurality of sheets placed one on top of another from an ejecting device;
• a sheet trailing edge hitting section, against which a trailing edge in a sheet ejecting direction of a sheet stacked on the sheet stacking section is hit;
• a pair of sheet holding members for holding a sheet ejected one by one or the plurality of sheets placed one on top of another at a sheet holding position, and moving the sheet or the sheets to a sheet stacking position of the sheet stacking section;
• a sheet holding member moving device for moving the pair of sheet holding members from the sheet holding position to the sheet stacking position;
• and
• a friction member which is provided on one of the pair of the sheet holding members and which comes in contact with an uppermost sheet stacked on the sheet stacking section,
• wherein, when the pair of sheet holding members reach the sheet stacking position after holding the sheet or the sheets at the sheet holding position, the sheet holding member moving device moves the one of the sheet holding members in a direction opposite to the sheet ejecting direction so that the sheet or the sheets held by the pair of sheet holding members are moved in a direction opposite to the sheet ejecting direction and a trailing edge of the sheet or trailing edges of the sheets in the sheet ejecting direction are hit against the sheet trailing edge hitting section, and the friction member comes in contact with the uppermost sheet already stacked on the sheet stacking section so that the uppermost sheet is biased toward the sheet trailing edge hitting section located upstream in the sheet ejecting direction.