SHEET PROCESSING DEVICE AND IMAGE FORMING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a sheet processing device capable of preventing the deviation of a punching position in the width direction of a sheet by detecting the position of the sheet end on a punching line with high accuracy, and provide an image forming device. SOLUTION: This sheet processing device has a sheet high-speed punching mode of determining the punching position by detecting the width direction end part of the sheet while conveying the sheet, and a high-accuracy punching mode of determining the punching position by stopping the sheet to detect a sheet end 01 on a punching line L.