Gluing unit for an end edge of a log

Improved gluing unit for an end edge of a log arranged in a bearing structure of a machine for making logs, wherein said structure has a sloped surface for feeding logs and at the end of said sloped surface a rotating sorting device provided with a series of pockets for receiving single logs and feeding them towards said gluing unit, said gluing unit comprising—at the upper part—a feeder belt, moving forward at a constant speed in the forward movement direction of said logs and cooperates to evacuate the glued log, and—at the lower part—in succession after said rotating sorting device an unwinding roller, a first section of sloped surface, a timing unit a second section of sloped surface, a suction roller, connected to a vacuum source arranged above which is an upper roller adjustable in height, a glue dispenser device and evacuation surface, further provided for at said unwinding roller being an element for blowing a final edge of said log and a photocell for detecting said final edge, characterised in that said timing unit comprises at least one belt element moveable at constant speed in the opposite direction with respect to said feeder belt, said speed being lower than said speed, said at least one belt element cooperating with said feeder belt and positioning a free end of said final edge of said log in a position arranged according to an angle (α) with respect to the vertical depending on the diameter of said log in such a manner that when said log reaches said suction roller by rolling on said second section of sloped surface said free end of the final edge is arranged at the zone of contact with said suction roller.