| 摘要 |
Apparatus for the electromagnetic measurement of the speed of revolution of a twist tube of a false twisting device, the twist tube being fabricated from magnetically susceptible material and having an opening extending transversely of the axis thereof, the twist tube being mounted between opposite poles of a magnet so that a magnetic field extends substantially perpendicularly across the axis of the shaft, a coil mounted in the range of influence of the magnetic field for sensing the field variations induced by the periodical variations of the magnetic resistence of the rotating shaft. |
