鼓輪儲存送緯式噴氣織機緯紗張力之研究
碩士 === 國立臺灣科技大學 === 工程技術研究所 === 73 === An electronic tension meter was used to detect the weft tension of a drum-stored air-jet loom. The voltage signals of weft tension were stored and analysed by a microcomputer. The tension responses were smoothed by the method of moving average so as to remov...
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| Format: | Others |
| Language: | zh-TW |
| Online Access: | http://ndltd.ncl.edu.tw/handle/14317718495585919849 |
| Summary: | 碩士 === 國立臺灣科技大學 === 工程技術研究所 === 73 ===
An electronic tension meter was used to detect the weft tension of a drum-stored air-jet loom. The voltage signals of weft tension were stored and analysed by a microcomputer. The tension responses were smoothed by the method of moving average so as to remove very shor-term fluctuations. A series of experiments was then carried out to investigate the tension responses and their relationship with weaving efficiency for various types of weft yerns.
When the air-jet pressure increases, weft insertion velocity also increases. The time required to deliver the stored weft yarn is shortened and this is likely to cause broken weft or kink weft. For lower air-jet pressure, the weft velocity is reduced. The delivery time of stored weft yarn is delayed and this often leads to slack weft or shortened weft. Therefore, the control timing for the stored weft yarn to run out must coincide with the timing of weft yarn being hooked up by the sorting needle of the measuring device. It is found that the best weaving performance is obtained if the crank shaft angle for the stored weft yarn to run out is at 235°.
The increase in the number of short yarn hairness or decrease in the coefficient of friction of yarn against metal needs lower air pressure in order to keep the same crank shaft angle at 235° when the stored weft yarn runs out. This leads to a saving in air consump
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