Apparatus for measuring revolution speed of a body

Claim 2

Apparatus for the electromagnetic measurement of the speed of revolution of a twist tube of a false twisting device, said twist tube being fabricated from magnetically susceptible material and having an opening extending transversely of the axis thereof, a magnet having two oppositely spaced poles, said twist tube being mounted between the opposite poles of said magnet so that a magnetic field extends substantially perpendicularly across the axis of said 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 resistance of the rotating shaft, a disc mounted adjacent said magnet having its periphery in engagement with said twist tube to support said twist tube, the magnetic field of said magnet maintaining said twist tube pressed against the periphery of said disc.

Claim 3

Apparatus for the electromagnetic measurement of the speed of revolution of a twist tube of a false twisting device according to claim 1, wherein said disc is driven, thereby rotating said twist tube.

Claim 4

Apparatus for the electromagnetic measurement of the speed of revolution of a twist tube of a false twisting device, said twist tube being fabricated from magnetically susceptible material and having a pair of longitudinally spaced openings extending transversely of the axis thereof, a U-shaped magnet having its poles disposed adjacent said openings respectively to vary the magnetic flux in the twist tube and simultaneously varying the magnetic stray field between the pole ends, at least one disc mounted between the poles of said magnet having its periphery in engagement with said twist tube, the magnetic field of said magnet maintaining said twist tube pressed against the periphery of said disc, and a coil mounted in the range of influence of said stray field for sensing the field variations.

Claim 5

Apparatus for the electromagnetic measurement of the speed of revolution of a twist tube of a false twisting device, said twist tube being fabricated from magnetically susceptible material and having a pair of longitudinally spaced openings extending transversely of the axis thereof, a U-shaped magnet having its poles disposed adjacent said openings respectively to vary the magnetic flux in the twist tube and simultaneously varying the magnetic stray field between the pole ends, at least one disc mounted between the poles of said magnet having its periphery in engagement with said twist tube, the magnetic field of said magnet maintaining said twist tube pressed against the periphery of said disc, and a coil mounted in the range of influence of said stray field for sensing the field variations.

Claim 6

Apparatus for the electromagnetic measurement of the speed of revolution of a twist tube of a false twisting device according to claim 3 wherein there are two spaced discs mounted between the poles of said magnet having their peripheries in engagement with said twist tube, and one of said discs is driven.

Claim 7

Apparatus for the electromagnetic measurement of the speed of revolution of a twist tube of a false twisting device, said twist tube being fabricated from magnetically susceptible material and having a pair of longitudinally spaced openings extending transversely of the axis thereof, a U-shaped magnet having poles disposed adjacent said opening respectively to vary the magnetic flux in the twist tube and simultaneously vary the magnetic stray fieLd between the pole ends, a pair of spaced discs mounted between the poles of said magnet having their peripheries in engagement with said twist tube to support and drive said twist tube, a driving shaft mounted in spaced parallel relationship with respect to said twist tube, said discs being mounted on driven by said shaft, the magnetic field of said magnet retaining said twist tube pressed against the periphery of said discs, and a coil mounted in the range of influence of said stray field for sensing the field variations.

Claim 8

Apparatus for the electromagnetic measurement of the speed of revolution of a twist tube of a false twisting device, said twist tube being fabricated from magnetically susceptible material and having a pair of longitudinally spaced openings extending transversely of the axis thereof, a U-shaped magnet having poles disposed adjacent said opening respectively to vary the magnetic flux in the twist tube and simultaneously vary the magnetic stray fieLd between the pole ends, a pair of spaced discs mounted between the poles of said magnet having their peripheries in engagement with said twist tube to support and drive said twist tube, a driving shaft mounted in spaced parallel relationship with respect to said twist tube, said discs being mounted on driven by said shaft, the magnetic field of said magnet retaining said twist tube pressed against the periphery of said discs, and a coil mounted in the range of influence of said stray field for sensing the field variations.

Claim 9

Apparatus for the electromagnetic measurement of the speed of revolution of a twist tube of a false twisting device according to claim 5, wherein said coil is mounted adjacent one pole end of said U-shaped magnet.