| 摘要 |
<p>A thread breakage detecting snail wire mounted on a ring frame must sensitively detect intrinsic vibrations occurring in a yarn. Accordingly, a groove (25) is formed on a piezoelectric element mounting portion (23) of the snail wire (2) so as to be directed perpendicularly to the axial direction of the piezoelectric element mounting portion (23) and is feasible for the vibration. Further, a protected piezoelectric element (12") and a connecting lead wire (141) are retained, buried, and held with an elastic member (29), thereby stably utilizing the snail wire for long time. </p> |
