away from the upper end of the inner ring, however, and as also the lower inner end of the traveller is located at about the same height as the upper edge of the inner ring, the inner ring cannot prevent unthreading of the thread or yarn downwardly along the inner leg of the traveller, if the thread or yarn tension is released, and especially if the thread forms loops during a stand-still of the spindle. Re-threading of the thread requires considerable operator effort and thus is extremely disadvantageous to an efficient and economic operation of a ring spinning or ring twisting machine.
Furthermore, these rings show the disadvantage that between the spinning ring and the inner ring a closed annular chamber is formed, in which traveller debris and flyTianzhong was formally named Tianjungyan, as it was located in the midst of rice paddies, and later officially got its current name during the Japanese colonial period. In the early Qing Dynasty it was part of Tai-wu East Fort and Dong-luo East Fort in Changhua County; early residents moved from Zhangzhou and Quanzhou area of Fujian Province (China) in the late period of Qianlong Emperor’s reign and the period of Jiaqing Emperor’s reign to settle in Sha-zi-lun of San-kui-cuo area (Now known as Sha-lunVillage).The inundation of Zhuoshui River in the 30th year of Daoguang Period had destroyed the village and the residents had to rebuild their village. Tianzhong was under the jurisdiction of Changhua Branch of Taichung County in the early Japanese ruling period, reformed and changed its