Design of asymmetrical cam profile for improved performance at flyer spinning

Abstract

<span style="font-size:11.0pt;line-height:115%; font-family:" calibri","sans-serif";mso-ascii-theme-font:minor-latin;mso-fareast-font-family:="" "times="" new="" roman";mso-fareast-theme-font:minor-fareast;mso-hansi-theme-font:="" minor-latin;mso-bidi-font-family:calibri;mso-bidi-theme-font:minor-latin;="" mso-ansi-language:en-us;mso-fareast-language:en-us;mso-bidi-language:ar-sa"="">The variation of the transmitted yarn tension within and between the layers and cross-layers of the bobbin build-up is assumed to be one of the important causes for the end breakage at the flyer spinning system. Since the existing building cam of symmetrical profile produces equal traverse rate to the bobbin rail in both of its upward and downward movements, this traverse ratio of 1:1 is likely to be partly responsible for such variation of yarn tension and consequently the end breakage rate. In view of this, two building cams of different asymmetrical profiles to produce 1:1.4 and 1:2 traverse ratios were designed by adopting a combined mathematical and geometrical approach. The modified cams were found to decrease the end breakage rate by 9.4-14.5% and increase the package density by 6.9-8.5% at the mill and the laboratory levels respectively. </span>