Patent ID: 7089981

Claim:
Gluing unit for the terminal edge of a log positioned on a support structure ( 12 ) of a machine for realizing logs, wherein said structure ( 12 ) envisages a sloping feeder surface ( 13 ) for feeding the logs ( 14 ) coming from a rewinding machine and wherein the end of said sloping feeder surface ( 13 ) is mounted with a rotating sorting device ( 15 ) provided with a series of pockets ( 15 a ) to receive the individual logs ( 14 ) and to feed them towards an actual gluing unit ( 11 ) characterized in that said gluing unit ( 11 ) comprises in sequence, a lower unwinding roller ( 16 ), and at least one upper feeder belt ( 17 , 26 ), that collaborate towards the forward travel of said logs and to the evacuation of the glued log towards an evacuation surface ( 34 ), and immediately downstream of said unwinding roller ( 16 ), a first section of sloping surface ( 21 ) followed by a timing roller ( 22 ) in turn followed by a second section of sloping surface having a pre-established length ( 23 ) followed finally by a suction roller ( 24 ) connected to a vacuum source over which is positioned an upper roller ( 25 ) which can be height adjusted and which cooperates with said suction roller ( 24 ) so that the suction roller holds the terminal edge ( 29 ) of said log, and a successive glue distributor device ( 27 ), also envisaged in a position higher than said unwinding roller ( 16 ) is a blowing element ( 19 ) for the terminal edge ( 29 ) of said log ( 14 ) and, in a lower position, a photocell ( 20 ) that interacts to detect said terminal edge ( 29 ) of said log ( 14 ), said log being positionable by said timing roller ( 22 ) with a free end of the log's terminal edge ( 29 ) in a position set by an angle (α) according to the diameter of the log and the final position on said suction roller ( 24 ) and such that the free end of the terminal edge ( 29 ) is positioned in the area in contact with said suction roller ( 24 ) when the log reaches said suction roller ( 24 ) by means of a rolling action along said second section of the sloping surface with the pre-established length ( 23 ) located upstream of said glue distributor device ( 27 ).