SHEET PROCESSING DEVICE AND IMAGE FORMING SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide press-binding that is hardly separated when a sheet is rewound without changing a mechanism for press-binding.SOLUTION: A sheet processing device includes: a branch path 241 for collecting sheets that are conveyed; and a binding device 210 for binding a sheet bundle 272 collected in the branch path 241 by pressurizing it using a denture mold 261 having a plurality of crimping parts 270. When a corner 272d of the sheet bundle 272 is bound by the binding device 210, an angle formed between in a longitudinal direction of a pressure connection mark 281 formed in the sheet bundle 272 by the crimping parts 270, and one side of a corner 272d of the sheet bundle 272 is almost 30-60°.