EXPERIMENTAL DETERMINATION OF THE USEFUL RESISTANCE FORCE IN MATERIAL MOVEMENT ON A SEWING MACHINE

Abstract

The article identifies the maximum value of useful resistance force that arises during material transport in a sewing
machine. This value is a key parameter in designing transport mechanisms. Experimental research confirmed that the useful
resistance force significantly impacts the quality of the seam, and its consideration is essential for optimizing the sewing process.
The resistance force is caused by various factors that are difficult to determine analytically, including the mass of material
before the sewing zone, friction between the material and the worktable surface, as well as the human factor. Additionally,
certain technological operations require extra tension of the material layers in the feed zone. Information on the quantitative
values of resistance force and their impact on seam quality is absent in the literature. The aim of the study is to determine the
effect of resistance force on seam quality. The results showed that with resistance force values up to 5 N and certain levels of
presser foot pressure, seam quality remains stable, with stitch length variation not exceeding 10%. This value can be adopted
when determining parameters for new fabric transport devices.