Process and apparatus for combining two yarns running parallel to form one yarn

摘要

In the two gussets which are limited by two rotationally symmetrical friction elements (7, 8) of a friction spinning unit (2), two yarns (34, 35) are produced and are drawn off continuously in the direction of the arrow (36). The front yarn (34) runs successively through the two front gussets of a first (3, 4) and, if appropriate, of a second (5, 6) pair of friction elements. The rear yarn (35) thereafter runs through a deflecting device (54) and then meets the front yarn (34) at the combination point (53), whereupon the two yarns are combined to form a single yarn. Both the radially adjacent (3, 4; 5, 6) and the axially adjacent (3, 5; 4, 6) friction elements are driven in opposite directions of rotation. The casings (37 to 40) of the friction elements (3 to 6) are subdivided alternately into portions (49) of high yarn attractive power and portions (50) without any yarn attractive power. Both the radially adjacent (3, 4; 5, 6) and the axially adjacent (3, 5; 4, 6) friction elements have mutually opposite portions of unequal yarn attractive power. All the friction elements (3 to 6) are driven at the same circumferential speed. The yarns produced in the friction spinning unit (2) are equipped, when they run through the pairs of friction elements (3, 4; 5, 6), with an alternating twist which leads to a good combination of the two yarns to form a single yarn, as soon as the yarns ... Original abstract incomplete. <IMAGE>