Capping head for a capping machine, capping method and cap

A capping head for a capping machine comprising:

• a locking unit having a connecting portion, the connecting portion having an engagement surface configured for engaging and connecting to a capping machine, and a capsule-pressing locking portion having a pressing surface configured to be positioned in contact against a respective wall of a capsule for pressing the capsule against a containment body on which the capsule is applied during an operating condition of said capping head;
• wherein the connecting portion is reversibly translatable relative to said capsule-pressing locking portion along a direction of translation between a proximal position and a distal position;
• a capping unit configured to perform a capping of the containment body;
• wherein said capping unit is reversibly movable between an operating configuration, wherein said capping unit is active on the capsule for capping the containment body, and a rest configuration, wherein the capping unit is not active on the capsule;
• a drive unit of the capping unit configured to reversibly move said capping unit between said operating configuration and said rest configuration;
• wherein said drive unit is kinematically coupled to said connecting portion for reversibly translating relative to said capping unit between an active position, wherein said drive unit includes an activation surface which acts on said capping unit for forming said operating configuration of said capping unit, and an inactive position, wherein said drive unit is not active on said capping unit for forming said rest configuration of said capping unit;
• a transmission mechanism, acting between the connecting portion and said drive unit, configured to determine a rotation of said drive unit in a first direction of rotation during a movement of said connecting portion between said proximal position and said distal position in a first direction of movement and to determine a rotation of said drive unit in a second direction of rotation during a movement of said connecting portion between said proximal position and said distal position in a second direction of movement opposite to said first direction of movement, wherein said transmission mechanism comprises at least one sliding guide defined by a groove and at least one sliding pin slidably inserted in said at least one sliding guide;
• wherein said capping unit comprises a plurality of rolling elements having rolling outer surfaces configured to be activated on a side wall of the capsule during said operating configuration of said capping unit to shape the side wall to match a threaded portion of the containment body;
• and wherein said capping unit is rotationally integral with said drive unit for capping the containment body activating said plurality of rolling elements for deforming the side wall of the capsule during said operating configuration.