In this machine the hollow spindle with the binder yarn is positioned between two pairs of cylinders, while a hook, below the spindle and rotating in the same direction, twists the core and effect yarn (Figure 1).
Given the intermediate position of the spindle - it is located between the pair of feeding cylinders and the pair of delivery cylinders - the twists imparted during this first stage are in the opposite direction between the first and second length of the two yarns.
The
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