Toray Engineering Company, Limited

Masazumi Imae

Takashi Iwade

Yukiko Shintani

Naotaka Yamamoto

The yarn manufacturing process is monitored by detecting a yarn tension while the yarn spun by a spinning device is wound by a winding device. The yarn tension detected by the yarn tension sensor is corrected based on the rate of change in a winding condition such as a traverse speed or a winding speed, and whether the yarn manufacturing process is in a normal condition or not is judged based on the corrected tension. Also, an abnormal judging reference is corrected based on the rate of change in a winding condition, and whether the yarn manufacturing process is in a normal condition or not is judged based on the corrected abnormal judging reference.

Method for monitoring yarn tension in yarn manufacturing process

An apparatus, for measuring a yarn tension, capable of preventing a filament breakage or loop from being generated while eliminating the necessity of adjustment and keeping a desired precision of measurement. The apparatus is constructed by an unit 1 for an application of a vibration to a yarn being moved, an unit 2 for measuring an apparent transverse wave propagation velocity of the yarn, and a unit 3 for calculating a true transverse wave propagation velocity based on the yarn speed and the calculated apparent transverse wave propagation velocity of the yarn. A control of a winding of the yarn in accordance with a propagation velocity of the transverse wave is also disclosed.

Method and apparatus for detecting yarn tension and method for winding

To equalize yarn tensions in a normal winding mode and a yarn switching mode when a yarn take-up operation is carried out by a yarn winder, the surface speed of the contact roller 4 or the frequency of current for driving the contact roller-driving motor 7 is controlled in a programmed manner. The programmed control is based on whether the winder is in the normal winding mode, the yarn switching mode in which the yarn is switched from a full bobbin to an empty bobbin, or a soft-touch winding mode in which the contact roller is brought into soft contact with the empty bobbin.

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Moriyama, Japan

Masazumi Imae