Thread sensor, an innovative, exact and contact-less measuring system

The thread sensor is disclosed which is adapted for use with a textile yarn processing machine, it plays an important role for the protector of the textile machine. The thread sensor is an innovative, exact and contact-less measuring system for the textile industry.

The thread 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.

Fil control offers 4 types of thread 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 thread sensors: capacitive sensors; optical sensors; piezo-electric sensors; electromechanical sensors.

Electronic or Electro-mechanical devices change state depending of the presence or the absence of the thread, the thread sensor is the most sensitive protection for the spinning machines.

During the yarn processing, the thread sensor purpose is to immediately and automatically detect the breakage or stoppage of one or more yarns.

The thread sensor will give the operator on duty an alarm with a visible LED flashing signal. It will simultaneously send out an electrical signal to the yarn cutter to cut off the broken yarn and grip the cut end, or send a digital signal to the PLC.

The operation of thread sensor

The invention to a thread 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.

more information about Fil Control click here

more information about thread sensor click here