Apparatus for wrapping groups of products

Apparatus for wrapping groups (1) product (2) with film, the apparatus (4) comprising at least: - a first surface (5), which moves in a direction (A) for conveying the products (2 ) to a second surface (6) to there form the groups (1) of products and wrapping groups (1) with a cut film (3) using suitable wrapping means (7) having a first drive shaft (AE1 ); - A supply unit (8) of film (3) which, by cutting, defines the length of the film (3) whose size depends on the dimensions of the group (1) of products to be wrapped; the unit (8) being located below and close to a slot (9) separating the first surface (5) of the second surface (6) and having a second electrical drive shaft (AE2) to allow the unrolling of a defined quantity of film (3) in the direction of the second surface (6); - A unit (10) pre-unwinding the film (3), which comprises at least one coil (11) of film (3) upstream of the feed unit (8) in the direction (B) of unrolling the film (3) and below the first and the second surface (5 and 6), the apparatus being characterized in further comprising at least: - a third electrical drive shaft (AE3) located and operating in the pre-unwinding unit (10) to move the film (3) towards the feed unit (8) depending on the need of film (3) or feed speed controlled by the second electric axis (AE2) of the unit power (8); said third electric axis (AE3) located between the coil (11) and a roller (13), major upstream of the feed unit (8) that controls the unwinding of the film (3) and comprises at least one third impeller phase variable (14) located between the coil (11) and roller (13), and a pair of rollers (15 and 16) feeding film (3), one of which is kinematically connected to the third drive (14); - A unit (12) controls the second and third electric axis (AE2 and AE3) and is located and operates between the same two electric axes (AE2 and AE3) to synchronize the power control of the film (3).