Patent ID: 7201368

Claim:
A sheet finisher comprising: a sheet stacker in which sheets outputted from an image forming apparatus are stacked; a binder which is selectively operable to bind the sheets stacked on the sheet stacker to form a bound sheet bundle; an ejection device which ejects the sheets out from the sheet finisher; an ejection tray on which the ejected sheets are stacked; and a controller for controlling the ejection device such that if at least one sheet which is not to be bound is outputted from the image forming apparatus while the bound sheet bundle is stacked on the sheet stacker, the bound sheet bundle is held on the sheet stacker, while the at least one sheet that is not to be bound is outputted from the apparatus and stacked on the bound sheet bundle, and such that the ejection device ejects the bound sheet bundle and the at least one sheet that is not bound stacked thereon as a unit to the ejection tray.