1. The structure design of the coordinate frame ensures the balance and correctness of the needle selection of the coaxial swing mechanism and the selection of the comprehensive guide box;
2. Long-distance crank torque transmission opening mechanism design, reduce the load of transmission force arm to achieve high-speed and stable operation of crank transmission;
3. The design of the concentric shaft swing opening mechanism, two bearing positions are provided on the left and right side frames, and the central shaft and the hollow shaft are supported axially in the side frame, similar to the two-way balance shaft swing force, combined into a coaxial swing opening mechanism, to realize the lifting and lowering clear opening movement of the tool selection device;
4. The design of the lifting opening selection mechanism reduces the friction between the knife and the guide rail of the opening lifting mechanism, reduces the mechanical transmission load, and improves the service life of the whole machine.