Patent ID: 7597324

Claim:
A sheet-stacking apparatus comprising: a conveying portion configured to convey a sheet; a plurality of stacking portions, each stacking portion suitable for holding a stack of sheet; an elevating device configured to individually move the plurality of stacking portions up and down, wherein a sheet conveyed by the conveying portion is capable of being stacked on each stacking portion, and the sheet-stacking apparatus is operable to stack a sheet across the plurality of stacking portions; and at least one of a notification portion configured to make a notification when the stacking portions with a sheet stacked across are moved down individually and a difference in height between a highest stacking portion and a lowest stacking portion becomes greater than a predetermined value, and a controller configured to stop a stacking operation when the stacking portions with sheets stacked across are moved down individually and a difference in height between a highest stacking portion and a lowest stacking portion becomes greater than a predetermined value.