Fuente: WIPO "tomato" A transversal ultrasonic sealing device (1) for a packaging machine configured to produce packages from a multi-layered packaging material, the device (1) comprising: - a body (3) having opposite lateral walls (3a, 3b); - a plurality of ultrasonic oscillating elements (2) configured to oscillate at ultrasonic frequencies; - a clamping element (6) configured to secure the plurality of oscillating elements (2) to the body (3), wherein the body (3) comprises a coupling region (8) configured to receive the clamping element (6), wherein the coupling region (8) is a reinforced region.