Patent ID: 7954818

Claim:
A sheet stacking apparatus comprising: a sheet conveying portion which conveys a sheet; a first sheet stacking portion which stacks the sheet conveyed by the sheet conveying portion; a second sheet stacking portion, disposed downstream of the first sheet stacking portion in the sheet conveying direction, which stacks the sheet conveyed by the sheet conveying portion; and a guide member, disposed above the first sheet stacking portion to downstream project from an upstream end of the first sheet stacking portion in the sheet conveying direction, wherein the sheet conveying portion conveys the sheet to one of the first and the second sheet stacking portions selectively, and wherein when the sheet conveying portion conveys the sheet to the second sheet stacking portion, said guide member guides to the second sheet stacking portion an upstream end of the sheet in the sheet conveying direction, the sheet being conveyed by the sheet conveying portion while the sheet conveying portion holds a downstream end of the sheet in the sheet conveying direction.