The Dynamics of Weft-Knitting Further Theoretical and Mechanical Analyses 1

Abstract

A computerized analytical technique for studying a mechanistic model of weft-knitted loop formation is described. This technique overcomes a previous deficiency of the model by allowing for the individual knitting tensions to be evaluated for any given set of knitting conditions. Consequently, each yarn and machine variable may now be studied independently, to investigate their individual effect on yarn knitting perform ance, machine efficiency, and quality of finished fabric. The results of studies on 18- and 36-gage linear cam systems show that the major vari ables are yarn friction and cam angle. Changes in input tension have only a second- order effect on yarn knitting performance. Great knitting advantages are hypothesized by the use of 60° linear cam systems over the conventional 45° designs for 18-gage equip ment, but little advantage is noted on 36-gage equipment for the same cam angle change. However, this work does suggest that present designs of 36-gage machines are inade quate, and new needle design features are sugested which are likely to radically improve the mechanical performance of this type of machinery.