Abstract: A conveying roller conveys a sheet. A sheet holding portion receives a sheet from below and holds the received sheet with keeping its forward end upward and its rear end downward. The sheet holding portion has: a storing guide provided in a vertical state and having a guide surface configured to guide the received sheet upward; a conveying guide provided to face the guide surface and having a curved surface portion whose distance from the guide surface increases in the upward direction; and a holding member provided between the guide surface and the curved surface portion and configured to roll on the curved surface portion toward the guide surface to nip the received sheet with the guide surface. An inclination angle of the curved surface portion with respect to the guide surface decreases with distance from the guide surface.

Abstract: This invention regards to a sheet storage apparatus. A forward and reversely rotatable conveying roller 301 which conveys a sheet to a tray 330 is disposed at a sheet conveying path R which guides the sheet conveyed from an image forming apparatus main body to the tray of the sheet storage apparatus 300. A retraction path 503 where the sheet is conveyed by reversely rotating the conveying roller is branched from the sheet conveying path upstream of the conveying roller. When plural sheets are stored in the tray, the sheets are conveyed to the retraction path by reversely rotating the conveying roller until a final sheet has been conveyed from the image forming apparatus main body, and when the final sheet has been conveyed, the sheets conveyed to the retraction path and the final sheet are conveyed in a state of being overlaid on one another to the tray.

Abstract: A sheet storage device and an image forming apparatus capable of increasing extractability and visibility are provided. A plurality of trays 330 (330a to 330e) receives sheets sequentially conveyed from an image forming apparatus main body 100A from a lower part thereof and stores the sheets in a standing condition. The plurality of trays 330 (330a to 330e) is configured such that a downstream end in a sheet conveying direction and a front end in a direction perpendicular to a sheet conveying direction of the stored sheets protrude from the trays 330 (330a to 330e).

Abstract: A sheet processing apparatus to perform stapling includes a sheet stacking portion receiving a sheet for a sheet bundle and a positioning member against which an end of the sheet is abutted to position the sheet bundle. The positioning member is movable to adjust a stapling position on the sheet bundle where a staple processing portion performs a stapling process. After the stapling process is performed, a fold processing portion folds the sheet bundle in two. One of two surfaces of the folded sheet bundle slides on a conveyance guide member while a conveyance guide member guides the folded sheet bundle. The stapling process is performed while the stapling position is previously moved, by a predetermined distance, to an opposite area side of the sheet bundle opposite to an area that becomes the one of two surfaces of the folded sheet bundle when the sheet bundle is folded in two.