Method and contactless measuring device for the tension of a fil

Details Method and contactless measuring device for the tension of a fil Method and contactless measuring device for the tension of a fil

1993-12-06

1996-02-27

Raevis, Robert

Measuring and testing

Dynamometers

Responsive to force

G01L 510

Patent

active

054939186

ABSTRACT:
Method and its devices for the contactless measurement of the tension and/or travel speed of an insulating filament, thread or wire. The method consists of processing the signal ##EQU1## in which C1 and C2 are the capacitances of a capacitive dipole. For the filament tension measuring device, the dipole (3) is defined by a pair of electrodes (4a/4b) of the same size and having a triangular shape and by a common electrode (2), processing consisting of extracting the vibration frequency of the filament between two supports by a spectral analysis. The speed measuring device comprises two dipoles (13,17), each defined by a pair of rectangular electrodes (14a/14b, 18a/18b) and a common electrode (12,16), processing consisting of extracting the passage time, between the two dipoles, of microscopic irregularities of the filament by an intercorrelation. The invention has application to the textiles field and particularly to the spinning of textile filaments.

REFERENCES:
patent: 3312892 (1967-04-01), Parnes
patent: 3871217 (1975-03-01), Miley
patent: 4311958 (1982-01-01), Aeppli
patent: 4568875 (1986-02-01), Piso et al.
patent: 4706014 (1987-11-01), Fabbri
Nuclear Instruments and Methods in Physics Research, vol. A281, n.sup.o 3, pp. 652-653.
French Search Report-FR9214703-FA483226-Aug. 5, 1993.

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