SHEET POST-PROCESSING DEVICE AND IMAGE FORMATION SYSTEM

To provide a sheet post-processing device which can achieve both of the miniaturization and the protective property of a user.SOLUTION: A sheet post-processing device performing post-processing on a sheet conveyed to a space sandwiched in the vertical direction comprises: a first cover member which is movable to a shielding position that shields the entrance from the outside to a first opening provided in the intersection direction intersecting the conveyance direction of the sheet in the space and to an opening position that allows the entrance from the outside to the first opening; sheet alignment means which is provided in the space, is movable in a width direction of the conveyed sheet and aligns at least the end in the width direction of the sheet; and post-processing means which performs post-processing to the sheet aligned by the sheet alignment means. The first cover member is moved to the shielding position and the opening position in conjunction with the movement in the width direction of the sheet alignment means.SELECTED DRAWING: Figure 13 【課題】小型化とユーザの保護性を両立できるシート後処理装置を提供する。【解決手段】上下方向に挟まれた空間に搬送されたシートに後処理を行うシート後処理装置において、空間のシートの搬送方向と交差する交差方向に設けられた第一開口部への外部からの進入を遮る遮蔽位置と第一開口部への外部からの進入を可能とする開放位置とに移動可能な第一カバー部材と、空間内に設けられ、搬送されるシートの幅方向に移動可能であって、シートの少なくとも幅方向の端部を整合するシート整合手段と、シート整合手段で整合されたシートに後処理を行う後処理手段と、を備え、第一カバー部材は、シート整合手段の幅方向の移動に連動して遮蔽位置と開放位置とに移動される、シート後処理装置による。【選択図】図１３