Abstract:

Aiming at the excessive flexibility impact and the destruction of the steady state of the machine due to sudden acceleration change of the presser foot mechanism and needle bar mechanism of the high speed embroidery machine, the paper firstly analyzed the movement rule of the presser foot mechanism and needle bar mechanism under high speed based on kinematics. Further, according to the analysis of the motion rule, the structural topology optimization based on the independent continuous mapping and finite element technology were used in the presser foot mechanism and needle bar mechanism. The discrete variable factor was transformed into a continuous function, and then the part was optimized by mapping to reflect 0 or 1 in the parts of subdomains. Several main components with excessive flexible impact forces were studied. They were divided into different grid areas, named subdomains (unit). The quality factors of each subdomains were defined by using topology variables, and the mass of the major parts with a flexible impact was reduced on the basis of mass balance. The engineering examples show that this method can meet the requirements of light quality and reduce the effect of flexible impact.

Key words: embroidery machine, presser foot mechanism, flexible impact, topological structure, subdomain, grid