SHEET PROCESSING DEVICE AND IMAGE FORMING SYSTEM

To provide a sheet processing device that can control the behavior of a saddle-stitched bundle of sheets and perform more accurate alternate stacking.SOLUTION: The present invention relates to a sheet processing device, the sheet processing device comprises a post-processing device 102 including: binding processing means, such as a post-processing unit 103 that performs saddle-stitching on sheets; a loading container 1 for loading paper 2 such as saddle-stitched paper bundles; a pair of left and right conveyance paths, such as conveyance paths 4a and 4b for discharging the loaded paper 2 to the bottom 1c of the loading container; discharge means, such as a conveyance roller 5 for discharging the loaded paper 2 to the lower side of the loading container; and a lifting member, such as an arm 3, for lifting the loaded paper 2 in the loading container, wherein the loading paper 2 in the loading container is lifted by the lifting member, and the loading paper 2 is conveyed in one of a pair of left and right conveyance paths to discharge it to the underside of the lifted loading paper 2, and by repeatedly moving the lifting member back out of the loading container and lowering the loaded paper 2, the left and right directions of the loaded paper 2 are changed and the loaded paper 2 is loaded from the bottom of the loading container.SELECTED DRAWING: Figure 3 【課題】中綴じされた用紙束の挙動を制御し、より正確な互い違い積載ができるシート処理装置を提供する。【解決手段】シートに中綴じを行う後処理ユニット１０３などの綴じ処理手段と、中綴じされた用紙束などの積載紙２を積載する積載容器１と、積載紙２を積載容器の底面１ｃへ排出する搬送路４ａ、４ｂなどの左右一対の搬送路と、積載紙２を積載容器の下側に排出する搬送ローラ５などの排出手段と、積載容器に積載された積載紙２を持ち上げるアーム３などの持ち上げ部材とを有する後処理装置１０２であって、持ち上げ部材により積載容器内の積載紙２を持ち上げ、積載紙２を左右一対の搬送路の何れか一方で搬送することにより、持ち上げられた積載紙２の下側に排出し、持ち上げ部材を積載容器の外側に退避させて積載紙２を降ろす動作を繰り返すことにより、積載紙２の左右の向きを変えて積載紙２を積載容器の下方から積載する。【選択図】図３