Apparatus for capping and packaging unit comprising said apparatus

A capping unit (100) for articles including containers and bottles, the capping comprising:

• a capping group (3) bearing one or more capping heads (8) for screwing caps (6) or capsules on said articles moved by a transport line (4),
• a capping heads store (19) that retains a series of the capping heads (8),
• each of the capping heads (8) of the series being configured for screwing caps (6) of a different size,
• the series of capping heads (8) including first capping heads (8) that screw on first caps (6) of a first size and second capping heads (8) that screw on second caps (6) of a second size,
• the retaining of the series of the capping heads (8) by the capping heads store (19) allowing rapid and automatic exchange and substitution of the first capping heads (8) for the first size caps (6) with the second capping heads (8) for the second size caps (6) in the capping group (3), as well as automatic exchange and substitution of second capping heads (8) for the second size caps (6) with the first capping heads (8) for the first size caps (6), as a function of the size of the caps (6) or capsules to be screwed, and
• motorization that moves said capping group (3) from a first position to a second position reaching said store (19) such to allow said capping group (3) to pick up, for the automatic exchange and substitution of the capping heads (8) in the capping group (3), a suitable capping head (8) from said series as a function of the size of the caps (6) or capsules to be screwed, thereby providing for, in the capping group (3), automatic exchanging and substituting the first capping heads (8) with the second capping heads (8) as well as automatic exchanging and substituting the second capping heads (8) with the first capping heads (8) based on the size of the caps (6) or capsules to be screwed.