Patent ID: 8439340

Claim:
A sheet processing apparatus comprising: a conveying portion that conveys sheets in a conveying direction; a collecting portion that collects the sheets conveyed by the conveying portion and forms a sheet bundle; a one-end gripping member that grips one end, with respect to the conveying direction, of the sheet bundle stacked on the collecting portion; an other-end gripping member that grips the other end, with respect to the conveying direction, of the sheet bundle stacked on the collecting portion; a moving portion that moves the one-end gripping member and the other-end gripping member so as to come close to each other; a pair of rollers that conveys the sheet bundle while nipping the sheet bundle, thereby folding the sheet bundle; a projecting member that projects a part between the one end and the other end of the sheet bundle gripped by the one-end gripping member and the other-end gripping member toward the pair of rollers; and a controller that controls the moving portion such that the one-end gripping member and the other-end gripping member come close to each other in synchronization with an operation of projecting the projecting member toward the sheet bundle.