Bookbinding unit

A bookbinding unit for encasing in coversheets and forming into booklets inner-leaf sheets collated into bundles, the bookbinding unit comprising:

• an inner-leaf tray on which inner-leaf sheets are set into a bundle;
• a cover tray on which coversheets are set;
• a bookbinding process path for guiding sheet bundles from said inner-leaf tray to, in order, an adhesive application location and a cover-binding location;
• inner-leaf conveyance means for transferring sheet bundles from said inner-leaf tray and along said bookbinding process path;
• coversheet conveyance means for feeding coversheets from said cover tray and setting them into place in the cover-binding location;
• adhesive application means, disposed in the adhesive application location, for applying adhesive to a spine-portion endface of inner-leaf sheets;
• cover binding means, disposed in the cover-binding location, for binding inner-leaf sheets together with coversheets;
• and
• control means for controlling said inner-leaf conveyance means, said adhesive application means, and said cover binding means;
• wherein
• said control means
• has input means for receiving input as to whether the makeup of a bundle of inner-leaf sheets includes saddle-stitch folded sheets, or is simple sheets alone;
• and
• is configured to control variably, based on bundle-makeup information from said input means, at least one means among said inner-leaf conveyance means, said adhesive application means, and said cover binding means.