Capping unit for closing containers with respective caps

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 (5a);
• 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 (17a);
• first drive means (14) presenting a plurality of primary electric motors (14a), 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 (18a), 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 (14a) and the secondary electric motors (18a);
• wherein the electronic controller device comprises a processing block (41) by means of which to vary the operating parameters of each primary electric motor (14a) and each secondary electric motor (18a) according to the dimensions of the respective containers (2).