Yarn forming apparatus with node welding

摘要

False-twisted yarn strands are separately carried around a guide wheel and the nodes thereof are brought together and locked by applying heat to the nodes and pressing them together, after which the strands are self-twisted. Embodiments include a cam actuated clamping device which holds the yarns in an ultrasonic transducer to which energy is supplied to accomplish the welding. Devices using resistance heating and laser impulses are also disclosed.