SHEET PROCESSING APPARATUS AND IMAGE FORMING APPARATUS

To provide a sheet processing apparatus capable of increasing the maximum number of bindable sheets in a configuration where a sheet bundle which remains adhered to a pressure bonding member after needless binding is released from the pressure bonding member.SOLUTION: A binding unit 102 which performs needless binding comprises a binding part 47 which sandwiches a sheet bundle by a pressure bonding tooth 471 and a pressure bonding teeth 472 in a thickness direction to pressure-bond the sheet bundle, a movement mechanism which movably supports the binding part 47 between a binding position where the sheet bundle is bound and a first retreating position outside a conveying region of the sheet for avoiding interference with a binding unit which performs needle binding, and a movement mechanism which movably supports an upper scraper 481 and a lower scraper 482 between a releasing position of the pressure bonding teeth 471 and the pressure bonding teeth 472 in a separation state and a second retreating position separated from the releasing position.SELECTED DRAWING: Figure 5 【課題】針なし綴じ後に圧着部材に引っ付いたままになったシート束を圧着部材から剥がす構成において、シートの綴じ可能最大枚数を増やすことが可能なシート処理装置を提供する。【解決手段】 針無し綴じを行う綴ユニット１０２は、圧着歯４７１及び圧着歯４７２によりシート束を厚み方向に挟んで圧着する綴部４７と、シート束を綴じる綴じ位置と、針有り綴じを行う綴ユニットとの干渉を避けるためのシートの搬送領域外の第一退避位置との間で、綴部４７を移動自在に支持する移動機構と、離隔状態の圧着歯４７１と圧着歯４７２との剥がし位置と、当該剥がし位置から離隔した第二退避位置との間で、上スクレーパー４８１と下スクレーパー４８２を移動自在に支持する移動機構とを備える。【選択図】図５