Comparative analysis of the energies of needle bar mechanisms of the sewing machines

Sewing machines a set of mechanisms that work together, of which the most dynamic mechanism is the one that drives the needle. Stitch quality, the stitch strength and the productivity of the sewing machine largely depend on the work of the needle bar mechanism. The main task during the study dynamics of the sewing machine mechanisms is to determine the energy balance. Purpose: The aim is to determine the total energy consumed by the mechanisms per one full rotation of the main shaft of each machine; the share of energy consumed by each unit of the needle bar mechanism for one turnover; the ratio of the energy of each of the links of the mechanism both during the working motion and during the free motion of the needle. Materials and Methods: The object of the study is the energies of the needle bar mechanisms of the sewing machines Juki DDL5550 and Textima 8332. An energy distribution analysis was performed during the working process and the free stroke of the sewing needle. The energies of the mechanisms of the two sewing machines were compared. Results: Were calculated maximum energy values are as follows: of the rocker: for Juki DDL5530 Ek = 2,8051 kg.m2/s2 and for Textima 8332 Ek = 1,3864 kg.m2/s2; of the executive links - the needle bars: for Juki DDL5530 Ek = 5,9507 kg.m2/s2 and for Textima 8332 Ek = 4,3696 kg.m2/s2; general energy of needle bar mechanism: for Juki DDL5530 Ek = 8,7487 kg.m2/s2 and for Textima 8332 Ek = 5,7416 kg.m2/s2. Conclusion: The comparative analysis reveals that the energy consumption of the needle bar mechanism of Juki DDL5530 is significantly higher. Consequently, the energy consumption indicator of the Textima 8332, which is directly driven without a clamp, is more efficient.