Sheet processing device

A sheet processing device comprising:

• a pair of jogger fences configured to carry out a crosswise direction alignment to a stack of image formed sheets ejected from an image forming apparatus;
• a rear end fence acting as a lengthwise reference edge of the sheet;
• a stapling device configured to staple the aligned sheet stack;
• a discharge belt configured to move the stapled sheet stack to a sheet ejection tray;
• and
• a controller to bow the sheet stack by setting the opposing distance of the pair of jogger fences narrower than the width of the sheet stack during the movement of sheet stack by the discharge belt to the sheet ejection tray.

A sheet processing device comprising:

• a processing tray table to load sheets on a tray;
• a crosswise direction alignment plate configured to carry out crosswise direction alignment the sheet;
• a rear end fence acting as a lengthwise reference edge of the sheet;
• a stapling device configured to staple the aligned sheet stack;
• a discharge belt to move the stapled sheet stack to a sheet ejection tray;
• and
• a deforming member configured to deform the processing tray table at the time of discharging the sheet stack.