Sheet post-process apparatus and waiting tray

A sheet post-process apparatus, the apparatus comprising:

• a waiting tray which temporarily retains a transported sheet in a waiting mode, and releases the retention to drop the sheet;
• a processing tray which bundles sheets dropped from the waiting tray to carry out predetermined processing, and ejects the sheets;
• and
• a storage tray which holds the bundle of sheets processed and ejected on the processing tray,
• wherein the waiting tray comprises:
• a waiting tray roller which ejects a transported sheet on the storage tray;
• first drive means for driving the waiting tray roller so as to come into contact with the sheet or so as to be spaced from the sheet;
• and
• second drive means for rotating the waiting tray roller in a direction in which the sheet is to be ejected, and
• the waiting tray roller is driven by the first and second drive means, making it possible to eject the sheet from the waiting tray directly to the storage tray.