The knowledge of sewing thread tension determined at different measuring locations on the sewing machine is the basis for the definition of the loading magnitudes acting during the stitch formation process and the locations at which they appear, concerning the stitch cycle or the main shaft turn of the sewing machine. During the stitch formation process the sewing thread is exposed to the highest tension in the region between the tension regulator and the thread take-up lever, following by tension in the region between the take-up lever and the needle and in the region in front of the tension regulator. Dynamic tension and tension force are also dependent on stitch velocity.
The perfect interlacing of needle and bobbin thread in the stitch formation process and seam appearance depends first of all on correct pre-tension of the tension regulator. Changes in the pre-tension settings also have a direct influence on the tensile force during the sewing process. This contribution presents the influence of pre-tension in a defined area on the tensile force in important phases of the stitch formation process. In addition the influence of the stitch velocity on tensile force was investigated. On the basis of statistic analysis it was ascertained in which pretension area and stitch velocity the significant differences between tensile forces occurred.
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