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AssigneeKabushiki Kaisha Toyoda Jidoshokki Seisakusho
InventorsHidejiro Araki, Ikuo Kodama
Estimating the term…
In a shuttleless air jet loom, a method for preventing a weft yarn having therein a defective portion, such as a too thin or too thick portion falling outside a predetermined range of limits, from being inserted into the shed and therefore woven in the fabric, is disclosed. In normal weaving operation, the weft yarn is monitored by a weft yarn sensor which is provided in the path of the weft yarn passage, and the weaving operation of the loom is interrupted when the sensor provides a signal representing a defective portion in the yarn. The yarn thus having the defect is deflected from its normal passage when it is to be picked into the shed. After the defective weft yarn has been disposed of, the loom is reversed to a shed-opening position where restarting of the weaving operation of the loom may be effected smoothly.
A method of preventing a weft yarn containing therein any defective portion from being woven into a fabric in a shuttleless loom in which consecutive lengths of weft yarn are measured as the yarn is drawn from a supply thereof and each measured length of weft yarn is inserted into the shed of warp yarns under the effect of a fluid ejected from a jet nozzle, said method comprising the steps of monitoring the drawn weft yarn by a sensor which is provided at a point between said weft yarn supply and the location where said weft yarn lengths are measured and within the path along which the weft yarn normally passes, interrupting the weaving operation of the loom in response to a yarn-defect signal which is provided by the sensor while continuing to draw said weft yarn from said supply and continuing to monitor the drawn weft yarn, removing the weft yarn having the defective portion for disposal thereof prior to the point of insertion into said shed, and restarting said weaving operation when said yarn-defect signal is terminated.
Dependencies are inferred from the claim text.