Patent ID: 8186664
Filing Date: 2012-05-29
Classification: B65H,Y10T

Abstract:
1. A sheet processing apparatus comprising: a first detector configured to detect a leading edge of a sheet conveyed in a conveying direction; a second detector provided on a downstream side of the first detector in the sheet conveying direction to detect the leading edge of the sheet conveyed; a punching portion, provided in the downstream side of the first detector in the sheet conveying direction, to move in a sheet width direction crossing the sheet conveying direction and perform a punching process for the sheet; an edge detector configured to move in the width direction together with the punching portion and detect the edge of the sheet conveyed in the width direction; and a controller configured to control the edge detector to start movement in the sheet width direction after one of the first and second detectors, which selected on the basis of at least one of information of a conveying speed of the sheet and a sheet length in the conveying direction, detects the leading edge of the sheet.