A binding apparatus includes a receiving device configured to receive a sheet from outside and convey the sheet, and a sheet folding device configured to fold the sheet, conveyed by the receiving device, in two at a center portion thereof in a direction the sheet is conveyed, so as to be a folded sheet,...http://www.google.de/patents/US6983931?utm_source=gb-gplus-sharePatent US6983931 - Sheet folding and binding apparatus and method
