The airflow in the reed groove of the air jet loom for the weft insertion includes the jet stream from the relay nozzle, the back leak stream from the reed, and the diffusion stream from the open side. The air velocit...The airflow in the reed groove of the air jet loom for the weft insertion includes the jet stream from the relay nozzle, the back leak stream from the reed, and the diffusion stream from the open side. The air velocity in the reed groove can be measured to analyze the influence of process parameters during the weft insertion. The relation between the air velocity and the relay nozzle distance, the jet angle or the supply pressure of the relay nozzle can be studied. In this paper, the pitot tube is applied to measure the air velocity in reed groove by the instrument designed. And the results indicate that the air velocity fluctuation in the reed groove is strong, and can drop from 150 m·s-1 to 80 m·s-1 drastically.展开更多
The Ming dynasty （1368 - 1644） inherited the lens-standing culture in China, of course including the textile technology. Besides a large amount of sinsle color damask silk, many pattern woven silk including dragon r...The Ming dynasty （1368 - 1644） inherited the lens-standing culture in China, of course including the textile technology. Besides a large amount of sinsle color damask silk, many pattern woven silk including dragon robes, patterned costumes and luxurious silk textiles are found in complicated and colorful pattern woven brocade called zhuang hua. It was prevailed in Ming dynasty when compared with the frequency of the name chuang hua recorded in related historical documents. These pattern silk and brcrade were produced by the advanced pattern weavin8 technology, which was well developed in Ming dynasty. From historical documents of＂Tian gong kai wu＂, Exploitation of the works of nature, there is the detailed description of the draw loom （hua Io ji） which can weave normal patterned textiles. It also indicated that to produce dragon robes needed much more high technique, similar to the hua Io ）i but more complicated and difficult. A big draw loom is found to weave Nanjing Yen brocade today inherits the technolosy to weave zhuang hua brocade. After sorting the historical documents, it is found that some records are coincident with the existed materials, both the silk textiles and weaving technology. With these evidences research and exploration, this dissertatien tries to unravel the pattern weaving technolosy in the Ming dynasty.展开更多
For Toyoda looms with air-jet weft insertion,the beat-ing-up mechanisms together with those of Tsudakomawater-jet looms are analyzed.Then by changing thecrank length of the four-bar-linkage for the air-jetlooms to get...For Toyoda looms with air-jet weft insertion,the beat-ing-up mechanisms together with those of Tsudakomawater-jet looms are analyzed.Then by changing thecrank length of the four-bar-linkage for the air-jetlooms to get four specifications of reed travel correspond-ing to the series of Tsudakoma water-jet looms,it canbe proved by comparisons of displacements,velocities,accelerations and transmission pressure angles that thosetwo series of mechanisms have very similar kinematicproperties.So the possibility of developing a series of wa-ter-jet looms modified from Toyoda air-jet looms isproved.It is beneficial to save the machine cost andbroaden the machine types.展开更多
文摘The airflow in the reed groove of the air jet loom for the weft insertion includes the jet stream from the relay nozzle, the back leak stream from the reed, and the diffusion stream from the open side. The air velocity in the reed groove can be measured to analyze the influence of process parameters during the weft insertion. The relation between the air velocity and the relay nozzle distance, the jet angle or the supply pressure of the relay nozzle can be studied. In this paper, the pitot tube is applied to measure the air velocity in reed groove by the instrument designed. And the results indicate that the air velocity fluctuation in the reed groove is strong, and can drop from 150 m·s-1 to 80 m·s-1 drastically.
文摘The Ming dynasty （1368 - 1644） inherited the lens-standing culture in China, of course including the textile technology. Besides a large amount of sinsle color damask silk, many pattern woven silk including dragon robes, patterned costumes and luxurious silk textiles are found in complicated and colorful pattern woven brocade called zhuang hua. It was prevailed in Ming dynasty when compared with the frequency of the name chuang hua recorded in related historical documents. These pattern silk and brcrade were produced by the advanced pattern weavin8 technology, which was well developed in Ming dynasty. From historical documents of＂Tian gong kai wu＂, Exploitation of the works of nature, there is the detailed description of the draw loom （hua Io ji） which can weave normal patterned textiles. It also indicated that to produce dragon robes needed much more high technique, similar to the hua Io ）i but more complicated and difficult. A big draw loom is found to weave Nanjing Yen brocade today inherits the technolosy to weave zhuang hua brocade. After sorting the historical documents, it is found that some records are coincident with the existed materials, both the silk textiles and weaving technology. With these evidences research and exploration, this dissertatien tries to unravel the pattern weaving technolosy in the Ming dynasty.
文摘For Toyoda looms with air-jet weft insertion,the beat-ing-up mechanisms together with those of Tsudakomawater-jet looms are analyzed.Then by changing thecrank length of the four-bar-linkage for the air-jetlooms to get four specifications of reed travel correspond-ing to the series of Tsudakoma water-jet looms,it canbe proved by comparisons of displacements,velocities,accelerations and transmission pressure angles that thosetwo series of mechanisms have very similar kinematicproperties.So the possibility of developing a series of wa-ter-jet looms modified from Toyoda air-jet looms isproved.It is beneficial to save the machine cost andbroaden the machine types.
