Appartus and method for welding
AssigneeMs Spaichingen GmbH
InventorsJoachim WEIN, Hartmut POLL, Elmar NODER, Clemens BALLE
Life of this patent
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Abstract
In an apparatus and a method for welding of workpiece layers, a feed device is activated with a predefined adjustment force without ultrasound activation and the sonotrode is advanced in the direction of an anvil. The adjustment force is subsequently reduced and the sonotrode is activated. The sonotrode can subsequently be deactivated and the adjustment force can be increased on the basis of a deactivation signal.
Claims19
An apparatus for welding or for cutting and sealing workpiece layers (10, 12) by means of ultrasound comprising at least one sonotrode (14) and at least one anvil (16) which can be positioned relative to one another by a feed device (18), wherein a detector device (30) is provided which detects an electrical resistance between the sonotrode (14) and the anvil (16) and which generates a deactivation signal (D) for the sonotrode (14) and/or for the feed device (18) in dependence on the determined resistance.
A method for welding or for cutting and sealing workpiece layers by means of ultrasound while using an apparatus comprising at least one sonotrode (14) and at least one anvil (16) which can be positioned relative to one another by a feed device (18), wherein a detector device (30) is provided which detects an electrical resistance between the sonotrode (14) and the anvil (16) and a deactivation signal (D) is generated for the sonotrode (14) and/or for the feed device (18) in dependence on the determined resistance, the method having the following steps:
- a) activating the feed device at a predefined positioning force without activating the sonotrode or with activating the sonotrode at a low amplitude and positioning the sonotrode in the direction of the anvil to compress the workpiece layers;
- b) reducing the positioning force;
- c) activating the sonotrode or increasing the amplitude to a higher value;
- and
- d) deactivating the sonotrode and increasing the positioning force, in particular to approximately the original value, when the detector device has generated a deactivation signal.
Dependencies are inferred from the claim text.