Patent ID: 7484650

Claim:
A sonotrode ( 41 ) for carrying out cutting or welding operations on work pieces ( 25 ) in a single operation, wherein the sonotrode ( 41 ) has associated with it a rotational drive ( 22 ) whereby the sonotrode ( 41 ) is drivable in a rotating manner and the sonotrode ( 41 ) thus performs, during the simultaneous cutting and welding of the work piece ( 25 ), a rolling-contact type movement, and wherein the sonotrode ( 41 ) incorporates a sonotrode body ( 33 ), a circular cutting blade ( 1 ) that carries out the cutting process, and a sonotrode disc ( 5 ) disposed at an axial distance from the cutting blade ( 1 ) said sonotrode disc ( 5 ) being operative to carry out, as an oscillation transmitter, the welding process with its outer circumference, characterized in that the cutting blade ( 1 ) is affixed on a blade holder ( 4 ) substantially free from oscillations on the sonotrode body ( 33 ) and vibrational decoupling between the cutting blade ( 1 ) and the sonotrode disc ( 5 ) is created by their axial distance ( 6 ), that a first annular space ( 8 ) is provided between the blade holder ( 4 ) and the sonotrode body ( 33 ) for vibrational decoupling acting in the radial direction, that the first annular space is open at its face end toward the sonotrode disc ( 5 ), that the sonotrode body ( 33 ) has a further annular space ( 7 ) that is open toward the front at its face end, that, for the vibrational decoupling acting in the radial direction, the first annular space ( 8 ) is formed on the outer circumference of the blade holder ( 4 ) radially outward in the direction toward the inner circumference of the shaft ( 40 ), and that the further annular space has a lower end that is approximately at the center region of the sonotrode body.