Patent ID: 7251921

Claim:
A capping unit for closing containers ( 2 ) with respective caps ( 3 ), comprising: a carrier and conveyor component ( 5 ) on which to advance the containers ( 2 ) and the respective caps ( 3 ); a motor ( 6 ) associated with the carrier and conveyor component ( 5 ), by which the carrier and conveyor component ( 5 ) is set in rotation about a respective primary axis ( 5 a ); a plurality of capping assemblies ( 11 ) associated with the carrier and conveyor component ( 5 ), each positioned above a corresponding container ( 2 ) and capable of movement vertically between a first position, distanced from the respective container ( 2 ), and a second position actively engaging the container, wherein each capping assembly ( 11 ) presents a gripping mechanism ( 17 ) such as can be associated with a relative cap ( 3 ) when the corresponding capping assembly ( 11 ) is in the second position, and the gripping mechanism ( 17 ) is rotatable in such a way as to screw the cap ( 3 ) onto a threaded neck ( 4 ) of the respective container ( 2 ) about a respective secondary axis ( 17 a ); first drive means ( 14 ) presenting a plurality of primary electric motors ( 14 a ), each one of which associated with a respective capping assembly ( 11 ) by which the single capping assemblies ( 11 ) can be set in motion vertically, one independently of another; second drive means ( 18 ) presenting a plurality of secondary electric motors ( 18 a ), each one of which associated with a respective gripping mechanism ( 17 ) by which the single gripping mechanisms ( 17 ) can be set in rotation one independently of another; and an electronic controller device ( 40 ) connected to each of the primary electric motors ( 14 a ) and the secondary electric motors ( 18 a ); wherein the electronic controller device comprises a processing block ( 41 ) by means of which to vary the operating parameters of each primary electric motor ( 14 a ) and each secondary electric motor ( 18 a ) according to the dimensions of the respective containers ( 2 ).