| 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 ultrasound 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 provided in the inner diameter of the counterweight (9). <IMAGE> |
