Jerk Reduction in the Thread Take-Up Lever Mechanism of a Sewing Machine

Kelvin Ribeiro de Faria Santos; Marco Tulio Correa de Faria Faria

doi:10.15866/ireme.v17i5.23064

Jerk Reduction in the Thread Take-Up Lever Mechanism of a Sewing Machine

Kelvin Ribeiro de Faria Santos^(1*), Marco Tulio Correa de Faria Faria⁽²⁾

^(*) Corresponding author

Authors' affiliations

DOI: https://doi.org/10.15866/ireme.v17i5.23064

Abstract

Industrial sewing machines usually operate at high speeds. The most common are the lockstitch machines, which rely on a set of mechanisms that operate in synchronized mode. In those machines, the thread take-up lever mechanism is responsible for the quality of the stitch formed. This paper presents a multi-objective optimization procedure for this mechanism, aimed at modifying the generated curve and the jerk, of the point belonging to the coupler. A change on the coupler curve can lead to a reduction on the mechanism vibration without affecting the synchronization with the other mechanisms. The genetic algorithm procedure is based on differential evolution. The optimized parameters are related to a four-bar mechanism. A reduction of the jerk in the horizontal direction of approximately 40% is observed, without the vertical motion varying more than 0.43 mm over a 26 mm amplitude of the original motion.
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Keywords

Genetic Algorithm; Linkages; Mechanisms; Optimization; Thread Take-Up Lever

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