| 摘要 |
<p>Method for forming strands (16, 18) into twisted strand units having a twist direction that reverses from section to section wherein the strands are advanced side-by-side successively through first and second mutually spaced twister heads (30, 32). The strands are formed into twisted strand units by the steps of operating the twister heads simultaneously by revolving the twister heads in a common rotary direction (36, 36) about the strands at substantially the same speed of head revolution thereby causing a first progression of twists (A) of one lay direction to pass from the first twister head (30) towards the second twister head (32), and a second progression of twists (C) of opposite direction lay to eminate from the second twister head. Twisting operations by the first and second twister heads are simultaneously terminated as the leading end of the first progression of twists reaches the second twister head and a trailing end of the second progressing of twists eminating therefrom. Twisting operations of the first and second twister heads are then suspended until a trailing end (B) of the first progression of twists reaches the second twister head (Fig. 4) whereupon the foregoing steps are repeated. </p> |
