Patent ID: 8156984

Claim:
An ultrasonic welding device for welding filmlike materials, comprising: an ultrasonic sonotrode; an anvil; an adjusting device for adjusting a relative position between the ultrasonic sonotrode and the anvil; a regulating device, which via the adjusting device regulates a width of a working gap between the ultrasonic sonotrode and the anvil; and a bearing moveably supporting the anvil relative to the ultrasonic sonotrode, wherein the adjusting device includes a first wedge element connected to the anvil, a second wedge element, and an actuator, wherein the actuator is connected to the second wedge element and moves the second wedge element relative to the first wedge element in order to execute a change of position of the anvil relative to the ultrasonic sonotrode, wherein a first spacing sensor measures a position of the ultrasonic sonotrode and outputs a measured value to the regulating device, wherein a second spacing sensor measures a position of the anvil and outputs a measured value to the regulating device, and wherein the regulating device calculates a width of the working gap based on the measured values from the first and second spacing sensors.