Patent ID: 7325373
Filing Date: 2008-02-05
Classification: B29C,B65B

Abstract:
1. A rotary unit of an FFS (Form, Fill and Seal) machine for ultrasound sealing of a continuous tubular strip housing an orderly succession of products and fed along a feed path extending through a sealing station, the rotary unit comprising: two rotors located on opposite sides of the feed path, rotating in opposite directions about respective axes of rotation, and having respective pitch surfaces tangent to each other and to the feed path; an ultrasound sealing head forming part of one of the rotors and cooperating at the sealing station with a corresponding anvil forming part of the other rotor to close the tubular strip along a transverse seal line located at a respective portion of the tubular strip extending between two respective adjacent products, the sealing head comprising a respective actuating device coaxial with an axis of the sealing head, wherein each of said two rotors comprises a predetermined number of sealing heads and an equal number of anvils, wherein the two rotors are identical, wherein each sealing head has a respective sealing surface and each anvil has a respective contrast surface, and wherein said sealing surface and said contrast surface define respective portions of the pitch surface of a respective rotor.