| 摘要 |
The invention relates to an arrangement in a drive unit (2) for an ultrasound sealing unit (1). The drive unit (2) is of the type which has a number of piezoelectric ceramic plates (7) disposed with interjacent, conductive metal sheets (8) coupled to an a.c. source. The ceramic plates (7 ) and the metal sheets (8) are held together with a counterweight (9) by a clamping screw (10) which partly secures the drive unit (2) to the ultrasoun d sealing unit (1), and partly realises a clamping force on the drive unit (2) . The counterweight (9) has an inner and an outer diameter. In order to obtain a uniform pressure loading on the ceramic plates (7), a groove (12) is provide d in the inner diameter of the counterweight (9). |
