Patent ID: 7744085

Claim:
A sheet processing unit, comprising: a sheet aligning unit including a sheet aligning mechanism configured to align a sheet member transferred into the sheet aligning unit, the sheet aligning mechanism including a sheet stopper configured to align the sheet member at a trailing edge thereof; an ejection sheet tray configured to stack the sheet member; a return mechanism configured to return the sheet member stacked on the ejection sheet tray to the sheet stopper; a discharging mechanism configured to discharge the sheet member, aligned by the return mechanism, from the sheet stopper to the ejection sheet tray; a first jogger with a first vertical part and a first movable loading part, the first vertical part configured to contact a first edge of the sheet member and the first movable loading part configured to stack the sheet member; a second jogger with a second vertical part and a second movable loading part, the second vertical part configured to contact a second edge of the sheet member and the second movable loading part configured to stack the sheet member; and a guide bar passing through the first vertical part and the second vertical part, wherein the return mechanism faces a loading surface of the ejection sheet tray and the return mechanism includes a structure configured to press against the ejection sheet tray.