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Evaluation of the Length Distribution of Needle Thread within the Take-up Disc Zone of a Lockstitch Machine

Research and development

Authors:

  • Korycki Ryszard
    Department of Technical Mechanics and Informatics, Technical University of Łódź, Łódź, Poland
  • Krasowska Renata
    Department of Spinning Technology and Yarn Structure, Technical University of Łódź, Łódź, Poland

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Abstract:

Evaluation of the length distribution of needle thread during stitch formation is necessary to determine the dynamic characteristics of a sewing machine, and the thread needed in this process. In this study, physical and mathematical models of the take-up disc are developed. The thread length for the full rotation range is determined as the geometrical distance between the active frictional barriers. The algorithm of calculations is introduced and implemented alternatively by means of the languages Fortran and C++, as well as by genetic algorithms. The length distribution of the needle thread obtained was verified by using simulations of the sequence and geometry of the frictional barriers, as well as experimental research of the purpose-oriented model of the take-up disc prototype.

Tags: lockstitch machine, take-up disc, working zone, algorithms, numerical calculations.

Published in issue no 5 (70) / 2008, pages 94–100.

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