To provide a sheet processing apparatus which performs fold reinforcing processing more properly than a conventional sheet processing apparatus having a fold reinforcing unit, and to provide an image forming apparatus and sheet folding method.
The sheet processing apparatus includes: a folding unit that folds a sheet bundle including a plurality of sheets to form a fold; a fold reinforcing roller that nips the fold of the sheet bundle having the fold formed thereon and conveyed to a fold reinforcing position, reciprocatingly moves along the direction of the fold, and reinforces the fold of the sheet bundle; a detection sensor that is arranged along a sheet conveyance direction between the folding unit and the fold reinforcing roller, and measures a folding height of sheet bundle at the fold reinforcing position; and a controller that reciprocatingly moves the fold reinforcing roller, on the basis of a result measured by the detection sensor.
ISHII JUN
TOSHIBA TEC KK
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