(57) A unit (1) for detecting the integrity of textile yarns (2, 3), which can be installed
on a spiral covering machine (4) which is suitable to spirally wind a spiral covering
textile yarn (3) on a conducting textile yarn (2) which is fed along a preset path
(P), wherein a device (18, 45, 61) for controlling the textile yarns (2, 3), arranged
along the path (P), has an electric circuit (26) provided with a normally-closed switch
(30) and formed by a fixed contact (32) and by a movable armature (35) which is coupled
by friction to the textile yarns (2, 3) and is spaced from the fixed contact (32)
when, during use, the textile yarns (2, 3) are continuous and in motion; the electric
circuit is furthermore provided with a signaling device (28) which is active when
the switch (30) is closed.
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