Design And Optimization Of Electric Sewing Machine With Large Stroke And Following Head

The research object of the paper is a kind of large size following electronic sewingmachine, which is improved from the traditional sewing machine. It has much innovation inthe mechanical construction design, and is very different from the tradition one. Comparedfrom the tradition machine, it has larger size and can sew prettier trajectories, as the sewinghead can rotate with the trajectories.Firstly, the overall design scheme is performed. Mechanical drive scheme of everyfunctional module is designed, and the selection calculation of critical components isconducted.A method based on mechanical kinetics, Virtual Prototype technology and FiniteElement Method (FEM) is proposed, aiming at the dynamic balance of planar linkage withelastic deformation. The method applies to the situation that the elastic deformation of thecomponents can’t be neglected. The method is based on the combination simulation of Pro\E、ADAMS and MATLAB. Taking a kind of crank-slide mechanism as an example, it uses thismethod to optimize a crank-slide mechanism’s dynamic balance and to make the objectivefunction value declined by about9.2%. The mechanism’s vibration characteristic is improved,so the method is proved to be practical and effective.Analyze the static performance of the critical components, to judge if they can meet theacquirement. Then the modal of machine frame and head shell is calculated, to acquire the6steps’ modal frequency. So as to moving parts can be designed to avoid these modalfrequencies, and avoid the resonance of the machine.Thermal design and thermal analysis of control cabinet for electric sewing machine wasresearched to make components in cabinet work correctly and meet the requirement. After theThermal design and thermal analysis, the temperature of servo drivers dropped11.1oC,10.8oC and11.3oC respectively. The data showed the cabinet’s heat dissipation was improved, andthe thermal design of the cabinet was reasonable. Finally, Thermal test of the prototype wasperformed, which proved the thermal design was effective, and the numerical simulationresult was correct.