Adhesive Applicator, and Bookbinding and Image-Forming Apparatuses Equipped with the Applicator

A glue container receiving hot-melt adhesive, an applicator roll, an apparatus casing, and disposed therein, a cooling unit and its control unit, for cooling a post-cover-sheet-processed sheaf, are provided. The control unit is configured to halt the cooling unit when adhesive is being applied to a sheaf with the applicator roll, and to actuate it after adhesive application. The control unit: ( 1 ) cools the apparatus casing interior by actuating the cooling unit when a sheaf is conveyed toward a glue application position; ( 2 ) halts the cooling unit when adhesive is being applied to a sheaf conveyed into the glue application position; and ( 3 ) reactivates the cooling unit after adhesive application. Thus controlling the apparatus-internal temperature appropriately in applying a hot-melt adhesive to a sheaf, and binding the sheaf together with a cover, etc. enables secure binding adhesion in a short time frame, without bookbinding defects such as missing leaves.