| 摘要 |
The operative part (20) of a device for cutting or welding webs consists of an oscillation generator divided into several sections and comprising a piezo element (21), and a horn radiator which amplifies the sonic energy generated in the oscillation generator (26) and transfers it to the web via the end of the horn (28). To improve efficiency and save space, the horn radiator (26) as per the invention is fixed directly on the piezo element, on the opposite side of which is located only a counter-section (22) of the oscillation generator. These three components are firmly secured together and form a novel combination (20). In this arrangement, the axial length (32) of the countersection (22) is smaller than or equal to 1/8 of the effective sonic wavelength, while the axial overall length (38) of the combination (20) is smaller than or equal to 3/4 of the sonic wavelength. |
