Patent ID: 7988139

Claim:
A sheet post-processing device that discharges a stack of sheets with trailing edges aligned with performing a binding process or without performing the binding process, the sheet post-processing device comprising: a binding tray on which the sheets are stacked; a reference member that serves as a reference for aligning the trailing edges of the sheets stacked on the binding tray; a binding unit that binds the sheets with the trailing edges aligned; a discharge tray to which the sheets are discharged; a discharge unit that discharges the sheets with or without performing the binding process from the binding tray to the discharge tray; a moving unit that moves the reference member in a sheet width direction; and a control unit that controls the moving unit, wherein the control unit controls the moving unit to move the reference member in a sheet width direction such that a first position of the reference member at a time of discharging the sheets without performing the binding process is closer to a center of the binding tray than a second position of the reference member at a time of discharging the sheets with performing the binding process.