Abstract
The rod presser foot and needle bar driving mechanism of the embroidery machine cannot achieve accurate parking time and position at high speed, which limits the development of high speed embroidery machine and make the quality of embroidery decline. Aiming at solving this bottleneck problem, the characteristics of the embroidery machine presser foot and needle bar driving mechanism based on analyzing the mechanism kinematics is developed. These characteristics and influences of each linkage parameters on the presser foot parking time and position are analyzed. Six main parameters are selected to optimize by using the complex method. Taking the parking position and linkage parameters as constraints, the parameters of the main linkages was optimized in order to obtain the maximum parking time of the presser foot mechanism. The results show that the optimized parameters is more reasonable and effective, the pause time of the presser foot mechanism is increased by 15.5%, and the parking position of the embroidery machine is at 100° ± 0.5° as required by the technological requirements, which satisfies the requirements of the coordinate movement of the needle bar-presser foot drive mechanism of the high-speed embroidery machine. The study also provides a method reference for the follow-up high-speed embroidery machine research and development.
Highlights
Double cam-drive is widely used in embroidery machines, and the problem of parking time and position accuracy of combined presser foot and needle bar drive mechanism driven by single cam has not been completely solved.[1]
It is necessary to ensure that the time required for needle rod to drop needle, prick cloth, and lift needle is less than the time for presser foot mechanism to restart movement, so as to ensure the precise cooperation of embroidery machine
The problem discussed in this paper focuses on increasing the pause angle, which does not require high convergence speed, the complex method has more advantages
Summary
Double cam-drive is widely used in embroidery machines, and the problem of parking time and position accuracy of combined presser foot and needle bar drive mechanism driven by single cam has not been completely solved.[1]. In order to overcome the short pause time of the presser foot and the insufficient matching with the needle bar mechanism and the poor accuracy, by using the complex method, the main structure parameters were optimize. It provides a design theory reference for the development of high speed embroidery machine. According to the above equations (6) and (13), the parameters that affect the pause time of the presser foot driving mechanism and the stop position of the embroidery machine can be obtained.
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