Patent ID: 8091882

Claim:
A sheet finishing apparatus comprising: a carrying mechanism which carries a sheet in a carrying direction; a puncher which moves to a penetrate position where the puncher punches a hole in the sheet that is carried and to a standby position where the puncher is retreating in a direction orthogonal to the carrying direction, and punches a hole in the sheet at the penetrate position; a detection unit which detects a lateral edge of the sheet; a finishing unit including a lateral alignment unit which has a pair of alignment boards movable in a direction orthogonal to the carrying direction and aligns the sheet by holding the sheet between the pair of alignment boards; a moving mechanism which moves the position of the alignment boards in a direction orthogonal to the carrying direction; and a control unit which measures a quantity of misalignment from the center of a carrying path of the sheet by using a result of detection of the lateral edge from the detection unit, and controls the moving mechanism in accordance with the quantity of misalignment.