SHEET PROCESSING DEVICE AND IMAGE FORMATION APPARATUS HAVING THE SAME

PROBLEM TO BE SOLVED: To provide a sheet processing device which can shorten the processing time of crimp-binding at a plurality of positions by reducing the separation interval between pressure teeth and a reception tooth when performing crimp-binding at different positions of the same sheet bundle.SOLUTION: A sheet processing device includes: a processing tray 76 on which sheets subjected to binding processing are placed as a bundle; and a crimp binding unit 82 which is movable along the end edge of a sheet bundle ST on the tray. The crimp binding unit 82 includes: a reception tooth 59; and pressure teeth 55a-55c which are engaged with the reception tooth and perform crimp-binding on the sheet bundle ST held therebetween. The pressure teeth have the crimping position (LM0) and the sheet reception position (ML3) for receiving the sheet to a space between the reception tooth and themselves. The sheet processing device shifts the pressure teeth to the intermediate position (ML4) between the crimping position and the sheet reception position when performing the plurality of times of crimp-binding on the sheet bundle ST by displacing the crimping position.SELECTED DRAWING: Figure 18 【課題】同じシート束の異なる位置に圧着綴じを行う場合に加圧歯と受け歯との離間間隔を短くしたので、複数個所での圧着綴じの処理時間を短縮できるシート処理装置の提供。【解決手段】綴じ処理されるシートを束として載置する処理トレイ７６と、このトレイ上のシート束ＳＴの端縁に沿って移動可能な圧着綴じユニット８２であって、この圧着綴じユニット８２は、受け歯５９と、前記受け歯と咬合して、その間に挟んだ前記シート束ＳＴを圧着綴じする加圧歯５５ａ〜５５ｃとを備え、前記加圧歯が、圧着位置（ＬＭ０）と、前記受け歯との間に前記シートを受け入れるためのシート受入位置（ＭＬ３）を有し、さらに、シート束ＳＴに前記圧着位置をずらして複数の圧着綴じを行う場合には、前記加圧歯を前記圧着位置とシート受け入れ位置との間の中間位置（ＭＬ４）にシフトするシート処理装置である。【選択図】図１８