Nissan Motor Company Limited

Yoshimi Wada

Miyuki Gotoh

A weaving machine is combined with a stop control means. A warp feeler, a weft feeler or a manual stop switch produces a stop signal and sends it to the control means. A comparator compares a crank angle sensed by a crank angle sensor with a preset angle supplied by a preset angle supplier, and produces a position signal at the preset angle. If the control means receives the stop signal during a normal weaving operation, then the control means stops the weaving machines immediately regardless of the crank angle by sending an output signal to a brake system of the weaving machine. After that, the control means starts the weaving machine moving at a slow speed, and stops this slow speed movement when the comparator produces the position signal at the preset angle.

Apparatus for stopping weaving machine at predetermined position

A weft sensor for a loom which can detect the presence or absence of a weft inserted into a warp shed at an acceptable moderate sensitivity on the basis of the majority decision of weft detection signals. When sensor sensitivity is too high, the weft sensor erroneously detects the fluff attached to the sensor as the presence of a weft, thus keeping the loom operated continuously. This erroneous detection reduces the quality of woven cloth. On the other hand, when sensor sensitivity is too low, the weft sensor erroneously detects a slender weft as the absence of a weft, thus keeping the loom stopped unnecessarily. This erroneous detection reduces the duty cycle of the loom. The weft sensor according to the present invention comprises a plurality of weft detectors and a majority decision circuit made up of a plurality of logical circuit elements such as AND, OR, NAND gates, etc.

Weft sensor for a loom

An optical weft sensor for a loom in which the light-receiving and light receiving elements are fixed to the loom frame and only the flexible optical fibers are disposed on the reed frame. Since no shock or vibration is applied to these electronic elements, it is possible to obtain a relatively long life time, thus improving the sensor reliability. Additionally, since the weft sensor according to the present invention is supported by a sensor holder, it is possible to readily adjust the sensor position along the reed frame or reed holder when the width of the cloth is required to change. The optical weft sensor comprises a LED, a phototransistor, optical fibers, and a detection circuit, in addition to the sensor holder.

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Higashiyamato, Japan

Yoshimi Wada