Arrangement in a drive unit for an ultrasound sealing unit

An ultrasound sealing unit includes a drive unit and a body. The drive unit consists of a number of piezoelectric ceramic plates with interjacent, conductive metal sheets connected to an a.c. source. The drive unit further consists of a counterweight and a clamping screw. The clamping screw holds to...

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Bibliographische Detailangaben
Hauptverfasser:	RAABE, MAGNUS
Format:	Patent
Sprache:	eng
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CONVEYING FOR PERFORMING MECHANICAL WORK IN GENERAL GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL HANDLING THIN OR FILAMENTARY MATERIAL MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGINGARTICLES OR MATERIALS METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICALVIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MUSICAL INSTRUMENTS PACKING PERFORMING OPERATIONS PHYSICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS SOUND-PRODUCING DEVICES STORING TRANSPORTING UNPACKING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	An ultrasound sealing unit includes a drive unit and a body. The drive unit consists of a number of piezoelectric ceramic plates with interjacent, conductive metal sheets connected to an a.c. source. The drive unit further consists of a counterweight and a clamping screw. The clamping screw holds together under a certain pretensioning the ceramic plates, the metal sheets and the counterweight. Moreover, the clamping screw fixedly secures the drive unit to the body. The body is a homogeneous body consisting of reaction bodies which surround the drive unit, a nodal plane with an anchorage edge and a horn with an elongate, narrow sealing surface. A gasket is disposed so that it constitutes a spacer between the body of the sealing unit and the ceramic plates. The gasket permits the oscillation of the ultrasound sealing unit, but prevents residual flexural stresses from reaching the drive unit. The spacing dimension of the gasket may be selected so as to govern the amplitude of the sealing unit to a predetermined, preselected amplitude.