Patent ID: 7970340

Claim:
An adhesive applicator comprising: sheet retaining means for retaining a sheet sheaf in a predetermined glue application position; adhesive application means, disposed in the glue application position, for applying adhesive to one endface of the sheet sheaf; a glue container, having said adhesive application means, for receiving hot-melt adhesive, said glue container being disposed free to travel paralleling the glue-application endface of the sheet sheaf; shift means for reciprocating the glue container along the glue-application endface of the sheet sheaf between a resupply position and a return position; heating means, disposed in said glue container, for heating and melting the adhesive inside; temperature control means for controlling said heating means; resupply-hopper means for replenishing said glue container with adhesive in solid form; a resupply path furnished in between said resupply-hopper means and said glue container, said resupply path being formed with an elbow for guiding the solid-form adhesive; vacuum-ducting means for suctioning glue constituents evaporated from said container; and control means for controlling said resupply-hopper means and said vacuum-ducting means; wherein said resupply-hopper means and said vacuum-ducting means are disposed in said resupply position, in adjoining positions above said glue container; and said control means is configured to actuate said vacuum-ducting means when adhesive said glue container is being replenished with adhesive from said resupply-hopper means, to prevent or mitigate invasion of evaporation derivatives into said resupply-hopper means.