A waiting tray is provided in a sheet-conveying path and holds sheets if the sheets need to be post-processed. A processing tray receives sheets conveyed from the waiting tray. It may receive sheets conveyed through the sheet-conveying path and coming not via the waiting tray, before the sheets are post-processed....http://www.google.fr/patents/US7306215?utm_source=gb-gplus-shareBrevet US7306215 - Sheet storage apparatus
