Patent ID: 8082721

Claim:
A packaging group with high packaging speed of products fed in succession in accordance with a predefined and variable pitch, comprising: a conveyor of said products; at least one roll of at least one plastic film; a feed mechanism that feeds said at least one plastic film from said at least one roll respectively atop and underneath said products exiting from said conveyor; a counter-welder belt downstream of said conveyor, and moving in the same direction as said conveyor, which receives said products covered on their upper and lower parts with said at least one plastic film; a transverse welder device at said counter-welder belt, said transverse welder device comprising a rotating star-like structure equipped with at least three spokes provided at their tips with a welder mechanism cooperating one after the other in succession with said counter-welder belt, in order to weld together portions of said at least one plastic film between said products advancing on said counter-welder belt, said welder mechanism being positioned such that, during rotation of said rotating star-like structure, the welder mechanism makes a circular trajectory at least partially co-penetrating a plane defined by said counter-welder belt; and a spring connected to a counter-welder belt roller of the counter-welder belt that allows the counter-welder belt to deform in accordance with the circular trajectory of the welder mechanism under the action of the welder mechanism.