US Patent 7959054 Device for processing workpieces using ultrasound

A device for processing workpieces using ultrasound, comprising an ultrasound sonotrode and an anvil, wherein a workpiece is processed between the ultrasound sonotrode and the anvil, the ultrasound sonotrode having a recess with open edges in the axial direction and a die is disposed in the recess in the direction towards the workpiece and/or the anvil, the die being displaceable between a rest position retracted into the ultrasound sonotrode and an operating position in which it partially projects out of the ultrasound sonotrode.