QIU Wei ming

(Zhejiang Qiuweiming Skills to master studio, Taizhou Radio & Television University, Taizhou 318010, China)

 

Abstract: Aiming at the noise and vibration problem of industrial lockstitch machines, such as motor, upper shaft, bevel gear, thread take up mechanism, material stabbing mechanism, feed dog driving mechanism, lower shaft and hook of sewing machine were vesearched. Through analysed noise and vibration of sewing machine, the ways to reduce noise and mitigate vibration were proposed. The upper shaft and its parts were major reasons for conducing the imbalance. A method was presented to achieve balanced design of thread take up mechanism and material stabbing mechanism, which meant lengthening the hinge center of linking shaft and crank, making the linking shaft centroid move to the hinge center of crank and linking shaft. The design conshdered both linking bar and crank, kept centroid approximate balance of them. On the one hand, kept the crank balanced, adjusted the shape of linking bar and moved its centroid to crank s hinge center of gyration; On the other hand, adopted approximate balance method, improved cranks balance precision ensured that major feed dog and needle plate could reach the expected trajectory. The experimental results indicate through analyzes the conclusion and takes some measures, the feasibility and validity of the design can be demonstrated availably.

 

Key words: sound; vibration; research; lockstitch sewing machine