Provided is the sheet bundle transport apparatus including: an abutment unit that performs switching between an abutment state at a predetermined position and a non-abutment state; first and second press units that press the sheet bundle against first and second transport units; a press switching unit that performs switching between a first press state where the first and second press units press the sheet bundle in a predetermined region located upstream from the predetermined position in the transport direction and a second press state where the first press unit does not press the sheet bundle in the predetermined region; and a control unit that controls the abutment unit and the press switching unit to switch the non-abutment state to the abutment state and switch the first press state to the second press state so as to change an angle relative to the width direction of a predetermined sheet bundle.

A sheet stacker includes: a loader to which a sheet bundle is to be loaded; a guide to receive a leading end of a sheet conveyed to an area above the loader, and guide the sheet along a guide path above the loader in a conveyance direction; a blower disposed above the guide path of the guide to blow air downward to the sheet; and multiple lines: disposed above the guide path of the guide; and extending in a direction inclined relative to the conveyance direction.

An upper conveyor deck includes a plurality of belts each supported by an upstream end pulley and a downstream end pulley which belts are configured to be driven along a closed path having an interior such that a lower run of each of the belts travels in a downstream direction and an upper run of the each of the belt travels in an upstream direction. A first diversion pulley in the interior of at least one of the belts contacts the lower run of that belt, and a diversion guide outside the interior of the belt contacts the belt downstream from the first diversion pulley. A deflecting device at the first diversion pulley is configured to prevent scrap material from becoming pinched between the belt and the first diversion pulley.