| 摘要 |
A tension detection device can detect the tension of a silk thread accurately even the magnetic field intensity of a magnet changes due to the temperature change. A tension sensor (51) comprises an expansion part (55)for correcting the change of the magnetic field intensity of the magnet (53) due to the temperature change, and the expansion device (53) is arranged between a plate spring (52) and the magnet (53), expands along with the rise of the temperature, and enables the magnet (53) to change towards a direction close to a Hall element (54) via the expansion along with the temperature rise. |
