Image forming apparatus including sheet processing unit capable of aligning sheets

A sheet processing unit, comprising:

• a sheet aligning mechanism including a loading part configured to stack a sheet member transferred into the sheet aligning mechanism and a vertical part configured to act on an edge surface of the sheet member;
• an ejection sheet tray configured to stack the sheet member;
• a sheet stopper configured to align the sheet member at a trailing edge thereof;
• a return mechanism configured to return the sheet member stacked on the ejection sheet tray to the sheet stopper;
• and
• a discharging mechanism configured to discharge the sheet member, aligned by the return mechanism, from the sheet stopper to the ejection sheet tray,
• wherein the return mechanism faces the ejection sheet tray and the return mechanism is further configured to exert a force against the ejection sheet tray to generate a friction force between the return mechanism and the paper, the friction force being used to return the sheet member to the sheet stopper.

A sheet processing unit, comprising:

• a sheet aligning unit, the 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 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,
• a sheet stopper configured to align the sheet member at a trailing edge thereof, and
• a guide bar passing through the first vertical part and the second vertical part;
• 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;
• and
• a discharging mechanism configured to discharge the sheet member, aligned by the return mechanism, from the sheet stopper to the ejection sheet tray, wherein the return mechanism faces the sheet ejection tray and the return mechanism is further configured to exert a force against the ejection sheet tray to generate a friction force between the return mechanism and the paper, the friction force being used to return the sheet member to the sheet stopper.