The influence of knitting machine characteristics and yarn properties on tensions occurring in yarn during knitting is investigated. The process is dynamically analyzed by means of frequency analysis for three grades of cotton yarn fineness and two of wool yarn. Signal analysis done numerically using discrete Fourier transform (DFT) results in force signals with one-sided and double-sided spectra. Some characteristic signals are presented with appropriate DFT to help determine the influence of yarn, package quality, and yarn feeding on signal spectra.
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References
1.
1. Black, D., and Munden, D. L., Increasing the Rates of Fabric Production of Weft Knitting Machinery, J. Textile Inst.61, 313–324 (1970).
2.
2. Knapton, J. J. F., and Munden, D. L., The Effect of Yarn Friction on Yarn Tensions in Knitting and Loop Formation, Textile Res. J.36, 1081–1091 (1966).
3.
3. Kowalski, K., Fadenzugkraft und Maschenlange beim Stricken, Textiltechnik30, 590–591 (1980).
4.
4. Pietikainen, J., The Effect of Positive and Negative Feed on Knitting Forces and Stitch Lengths with Different Cam Settings in Plain Fabric Knitting, Melliand Textilber.3, 196–200 (1983).
5.
5. Randall, R. B., Frequency Analysis, in “Application of B&K Equipment,” Naerum, 1977, p. 5.
6.
6. Srdjak, M., Influence of the Shape of the Cam on the Production Effect of Circular Knitting Machines as Well as on the Quality of Knitted Fabrics, Tekstil34, 83–93 (1985).
7.
7. Srdjak, M., and Stupica, I., The Analysis of the Knitting Process by the Model of a Knitting Machine, Tekstil36, 415–419 (1987).
8.
8. Vaughan, J., Strain Measurements, Application of B&K Equipment, Naerum, Copenhagen, Denmark, 1975, p. 45.
9.
9. Xu, Bugao, Identifying Fabric Structures with Fast Fourier Transform Techniques, Textile Res. J.66, 496–506 (1996).
