| 摘要 |
PROBLEM TO BE SOLVED: To provide a space-saving sheet stacking device that can stack sheets while shifting the sheets with a constant interval without degrading sorting performance and ejection productivity, and to provide an image forming apparatus.SOLUTION: A sheet stacking device that can stack sheets while shifting the sheets in a sheet ejection direction X with a predetermined interval includes: a first conveyor 70 that can stack the sheets; a plurality of stacking grippers 72 that are arranged with a specific interval in the first conveyor 70, and does not retain the sheets when the sheets stacked on the first conveyor 70 move in the sheet ejection direction X and retains the sheets when the sheets move in a sheet reverse feeding direction Y; a plurality of stacking gripper sheet detection sensors S2 that detect the existence of the sheet of the plurality of stacking grippers 72; and a position shifting gripper 73 that is movable both in the sheet ejection direction X and in the sheet reverse feeding direction Y and can change states into a gripping state where an sheet conveyance upstream end of the sheets can be gripped, and a non-retreat state where the sheet conveyance upstream end is not retained on the sheets even if the sheets are moved. |
