| 摘要 |
Ultrasonic sealing apparatus, including at least one anvil (32, 42-54) and at least one transducer (34, 112-116) opposed to the anvil to transmit ultrasonic energy to a workpiece (24) clamped between them, is disclosed. A biasing element (40) is connected between the anvil or the horn and its drive (36, 38) to define the sealing pressure developed between the anvil and the horn. The biasing force can be adjusted without stopping the machine, by using an externally applied pneumatic force. The anvil has a backing element (56) with a curved front surface (212) connected to a curved back surface (236) of the anvil. A fastener (226) is provided for selectively fixing the anvil and the backing element together or allowing the anvil to shift along the curved surface of the backing element for aligning the anvil with respect to the transducer. A cooling fluid may be provided for passing through a passage (240) in the anvil body for cooling during operation. A method for aligning the anvils and transducers of an ultrasonic sealing apparatus as described above is also disclosed. |
