Patent ID: 8622378

Claim:
A sheet processing apparatus comprising: a sheet stacking portion on which sheets are stacked; a folding portion which performs a double folding process to a sheet bundle made of a plurality of sheets which are stacked on the sheet stacking portion; a folded bundle conveying portion which conveys a folded bundle double folded by the folding portion; a folded end portion processing portion which processes a folded end portion of the folded bundle by abutting the folded end portion and moving in a direction orthogonal to a conveying direction; a folded bundle stacking portion on which a folded bundle discharged from the folded bundle conveying portion is stacked; a folded bundle transfer portion disposed on the folded bundle stacking portion, the folded bundle transfer portion moving the folded bundle stacked on the folded bundle stacking portion between a first stacking position where an upstream edge thereof in the conveying direction does not interfere with the folded end portion processing portion during a folded end portion processing, and a second stacking position which is closer to the folded bundle conveying portion than the first stacking position, such that the upstream edge in the conveying direction of the folded bundle stacked on the folded bundle stacking portion is positioned upstream in the conveying direction of a downstream edge in the conveying direction of the folded bundle to be discharged by the folded bundle conveying portion; and a controller which controls operations of the folded bundle conveying portion, the folded end portion processing portion, and the folded bundle transfer portion, wherein the controller: controls the folded bundle transfer portion so that, after a preceding folded bundle stacked on the folded bundle stacking portion has been moved to the first stacking position, the preceding folded bundle is moved to the second stacking position such that a succeeding folded bundle discharged to the folded bundle stacking portion abuts the preceding folded bundle, and controls the folded bundle conveying portion so that, in a case that the succeeding folded bundle has a length in the conveying direction such that the upstream edge in the conveying direction of the succeeding folded bundle remains within a stacking region of the sheet stacking portion when the succeeding folded bundle is temporarily stopped for the folded end portion processing, after the folded end portion processing has been applied, the succeeding folded bundle is conveyed until the upstream edge in the conveying direction of the succeeding folded bundle passes through outside the stacking region of the sheet stacking portion before the preceding folded bundle reaches the second stacking position.