Reverse Kinematics Design And Experimental Verification Of Weft Insertion Mechanism With Free Pitch Curve Of Non-circular Gear

China is a large textile country and textile exports rank first all over the world. However, china is a major importer in the textile machinery area. There are a lot of loom manufacturers, but their products are mostly middle or low levels, which cannot become international brands. This situation occurs because the domestic loom manufacturers have poor capability of independent innovation. For the rapier loom, the domestic manufacturers remain the mapping and imitation stage of the core mechanisms (such as the beating-up mechanism and the weft insertion mechanism), which will not only lead to violations, but also unrealize the ideal performance and reliability. Therefore, the R&D with a new weft insertion mechanism of independent intellectual property rights has a practical significance to upgrade the technology of domestic rapier loom.This paper deeply studys on the weft insertion mechanism with free pitch curve of non-circular gear, and the whole process of calculation, analysis, simulation, design and experimentation is studied and developed in aspects of both theory and application by the mechanics principle.This research is supported by the project of National Natural Science Fund Project—"Study on Analysis and Design Methods of Weft Insertion Mechanism and Beating-up Mechanism with Free Pitch Curve of Non-circular Gear (50875243)". The study contents and results of the thesis were as following:1) In accordance with the conditions of weft insertion mechanism, the mathematical model of inverse kinematics had been founded, and discrete pitch curve was solved. On the basis of this, the general computer-aided analysis program of weft insertion mechanism with inverse kinematics was developed.2) Three non-uniform B-spline curves were constructed by the discrete data points of non-circular gear pitch curve. On the basis of this, the paper introduced the curve fitting algorithm called ICP-Based B-spline Curve Fitting. Based on this algorithm, a curve had been fitted by original date points and analyzed its smooth.3) The software of tooth profile design of non-circular gear was developed independently by the mathematical model of non-circular gear tooth profile. Meanwhile, the copyright of computer software had been awarded (2009R11S048905).4) The three-dimensional model of weft insertion mechanism of non-circular geas and crank rocker was established, virtual assembly was completed and virtual prototype was developed. On the basis of ADAMS software, the kinematics of this institution was simulated and analyzed. Furthermore, the simulation result from ADAMS and the theoretical result from MATLAB had been compared; they were extremely similar, which mutually verified that they were both accurate.5) A test-bed of weft insertion mechanism of non-circular geas and crank rocker was developed. Based on the test-bed and high-speed video tape record, the correctness of kinematics model was verified.