Yarn tension sensor – a protector for the textile machine

A yarn tension sensor is disclosed which is adapted for use with a textile yarn processing machine.

The constitution of the sensor

The sensor includes a spring arm which is contacted by a running yarn, and such that the tension in the yarn acts to deflect the arm. In order to render the deflection of the arm relatively insensitive to external or machine vibrations, while permitting an accurate response to fluctuations in yarn tension, there is provided a structure for damping the spring arm, which includes a magnetic fluid having a portion of the spring arm immersed therein.

The operation and function of the sensor

The invention to a yarn tension sensor, in particular for yarns traveling at high speed, to accurately ascertain even short-term yarn tension fluctuations. According to the invention, a yarn guide element is mounted on one head end of a plunger coil disposed in a magnetic field. A position sensor is disposed in the region of the plunger coil and detects even minimal changes in position of the plunger coil. These changes in position are reported to a controller, at whose output variations in current are generated and supplied to the winding of the plunger coil, the variations being such to compensate for the axial force generated by the yarn and acting upon the plunger coil, thereby making the plunger coil virtually motionless.

Fil control offers 4 types of sensors

Specialized in studying, developing, producing, and selling equipment devices for the textile machinery industry, in one of its major fields, yarn sensors, fil control offers 4 types of sensors: capacitive sensors; optical sensors; piezo-electric sensors; electromechanical sensors.

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