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Технически университет - София

Abstract: Chapter 6 presents a comprehensive analysis of the mechanical interactions and forces influencing the operation of sewing needles within sewing machines. Key forces, including penetration, resistive, normal, and frictional forces, are examined in detail, with explanations supported by illustrative diagrams and mathematical models. The design and functionality of the sewing needle bar mechanism are also investigated, emphasizing the significance of the needle stroke – a critical parameter affecting the system's overall dimensions and efficiency. The chapter provides an in-depth discussion of the force calculations related to the needle bar movement mechanism, utilizing kinematic analysis to evaluate the forces and motions involved. It highlights the importance of understanding these mechanical interactions to optimize machine performance, improve stitch quality, and prevent common issues such as needle breakage or fabric damage.

References

1. Chervyakov, F., N. Sumarokov. (1968). Sewing machines. Mechanical Engineering Publishing House. (in Russian).
2. Kosev, K. (1979). Design of knitting and sewing machines. Technica publishing house Sofia. (in Bulgarian).
3. Marakushev, E. A., S. I. Rusakov, S. S. Eppel. (1968). Sewing machines: construction, calculation and design basics. Technika publishing house Kyiv. (in Russian).
4. Uicker, J. J., Uicker Jr, J. J., Pennock, G. R., & Shigley, J. E. (2023). Theory of machines and mechanisms. Cambridge University Press.

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