Apparatus for the wrapping of palletized product groups with plastic film

An apparatus for the wrapping of palletized product groups with a film or band of plastic including a support framework supporting a vertically mobile support structure for a mobile carriage which runs along said vertically mobile support structure, said carriage supporting a reel of plastic film, a pre-stretching unit, and an electric motor for driving said pre-stretching unit, said vertically mobile support structure comprising a vertically moving structure supported by said support framework and a rotating ring rotating around its own axis driven by a motor anchored and connected to said vertically moving structure;

• said carriage being fixed to the rotating ring and supporting an electric generator electrically connected to the electric motor of said pre-stretching unit for which it is the power supply source, said vertically moving structure including an annular toothed track and said electric generator including a shaft in continuous connection with said annular toothed track such that said shaft of said electric generator rotates in response to the rotation of said rotating ring.