Three Dimensional Design Of Button Hole Sewing Machine

Button hole sewing machine is an advanced special industry sewing machine, it isused in thick cloth’s button hole, in the front of the button hole is round. It’smechanical system consist of machine body, needle bar mechanism, upper shaftmechanism, zigzag mechanism, feeding mechanism, presser foot mechanism, feeddriving mechanism, cloth cutting mechanism, lower shaft mechanism, looper drivingmechanism, double chain stitch looper mechanism and spreader driving mechanism.All mechanism have their characteristics, not only closely worked, but alsoinseparably.We have conducted market research in DURKOPP and Brother, researched theusage of their button hole sewing machine. This paper based on the5820seriesautomatic buttonhole sewing machine development in Zoje sewing machine company,designed the mechanism system of three-dimensional.The needle bar mechanism is simplified to a simple crank slider mechanism.Using slider-crank mechanism principle, analysised the needle bar mechanismkinematics. Slider stroke S, the maximum acceleration of slider and the angle ofminimum and maximum angular acceleration have been calculated.Using Solidworks to build the3D model of every mechanical system. andproduction a three-dimensional explosion effect chart, interpretation of the spatialrelationship between every parts, provided a guiding role to the workshop onassembly work. Using3D assembly design method from the bottom downward,hierarchical assembly method, completed the buttonhole sewing machine model.Used the software ANSYS to analysis the casing modal of the button hole sewingmachine. Drew the design casing of the first6natural frequency. They are larger than the upper shaft rotation frequency. Under normal working conditions to produceresonance unlikely conclusion.Proposed to the button hole sewing machine key components (thread shifting forkheight, width of curved needle stitch, looper amplitude) adjustment method.The research and development of buttonhole sewing machine have been producedlargely in internship company, provided a good help to the enterprise’s new productdevelopment.