Patent ID: 8702086

Claim:
The sheet post-processing apparatus, comprising: a conveyance portion configured to convey a folded sheet bundle with a folded end portion as a leading end; a transport portion configured to abut on a lower surface of the folded sheet bundle conveyed by the conveyance portion, to transport the folded sheet bundle downstream in a sheet conveyance direction of the conveyance portion; a pressing portion arranged at a position opposing the transport portion, configured to press an upper surface of the folded sheet bundle conveyed by the conveyance portion; a moving portion configured to move the pressing portion in the sheet conveyance direction of the conveyance portion and in a direction opposite to the sheet conveyance direction; and a controller configured to control the conveyance portion, the transport portion and the moving portion, so that the conveyance portion conveys a succeeding folded sheet bundle such that the folded end portion of the succeeding folded sheet bundle overlaps with an open end portion, opposed to the folded end portion, of a preceding folded sheet bundle conveyed onto the transport portion, so that, when the succeeding folded sheet bundle is conveyed to the transport portion, the moving portion moves the pressing portion from a first position where the preceding folded sheet bundle is not pressed to a second position, disposed upstream of the first position in the sheet conveyance direction, to press the succeeding folded sheet bundle, and so that, when the pressing portion moves from the first position to the second position, the transport portion transports the preceding sheet and the succeeding folded sheet bundle overlapping with the preceding folded sheet bundle downstream in the sheet conveyance direction.