| 摘要 |
A method of welding a row of interconnected thermoplastic coupling elements for slide fasteners at opposed leg portions of each coupling element with the use of an ultrasonic horn. The method comprises: pressing the opposed leg portions of the coupling elements against the ultrasonic horn on its opposite sides during the coupling elements are being fed at constant speed; concurrently with this pressing step, fusing the opposed leg portions of the coupling elements at their confronting inner surfaces by ultrasonically vibrating the ultrasonic horn in a direction parallel to the confronting inner surfaces; and pressing the opposed leg portions of the coupling elements, after the latter is disengaged from the ultrasonic horn, against each other so as to be united at the confronting inner surfaces that have been fused. An apparatus for carrying the above method into practice efficiently and accurately is also disclosed. |
