Patent ID: 7866129

Claim:
A shuttle device for producing wrappers of sheet material containing a product with at least one fantail-twisted end obtained by twisting said sheet material, said shuttle comprising a first part for receiving said at least one product received in a precursor of wrapper and at least one second part that grips on a respective part of said precursor of wrapper, said at least one second part of said shuttle being able to turn with respect to said first part, about a given axis so as to produce said at least one fantail-twisted end as a result of the twisting action imparted on said precursor of wrapper resulting from said relative movement of rotation about said given axis, wherein said shuttle comprises a screw coupling between said first part and said at least one second part so that, during said relative movement of rotation about said axis that produces the formation of said fantail-twisted end, said first part and said at least one second part of said shuttle approach one another so as to compensate for the shortening of said precursor of wrapper resulting from said twisting action.