Book binding apparatus

A book binding apparatus comprising:

• a sheet entrance portion constructed to be opposed to an outlet of a first another apparatus disposed upstream of said book binding apparatus for receiving a sheet therefrom;
• a sheet convey path for conveying the sheet from said sheet entrance portion;
• a first discharge opening disposed downstream of said sheet convey path and constructed to be opposed to a first entrance of a second another apparatus disposed downstream of said book binding apparatus, for discharging the sheet from said book binding apparatus, and feeding into the second another apparatus;
• sheet storing means for temporarily storing the sheet branched from said sheet convey path by branching means;
• binding means for binding the sheets stored in said sheet storing means;
• conveying means for conveying a bound sheet bundle;
• and
• a second discharge opening constructed to be opposed to a second entrance of the second another apparatus, for discharging the sheet bundle from said book binding apparatus and feeding into the second another apparatus.