Patent ID: 8061701

Claim:
A sheet folding apparatus comprising: a saddle-stitching unit configured to stitch a center of a sheet bundle; a folding unit configured to fold the sheet bundle at the center to form a fold; a loading base onto which the sheet bundle conveyed from the folding unit is loaded; a movable lever, which is provided on the loading base, configured to detect the loading of the sheet bundle; a nipping plate configured to be pressed to and separated from the loading base and to nip the sheet bundle loaded onto the loading base, the nipping plate having a surface which faces the loading base and a notch formed at the center thereof for avoiding interference with the movable lever, the surface being provided with an elastic member that is divided by the notch; and first and second rollers that move along a direction of the fold while nipping and pressing the fold of the sheet bundle nipped by the nipping plate to reinforce the fold.