Evaluation of feeding performance based on error analysis of motion trajectory

Since assembly errors can lead to deviation of motion trajectory of sewing machines,such problems like mistaken feeding,cloth puckering,and missing needle often occur.Therefore,an evaluation method of feeding performance based on error analysis of motion trajectory is proposed.The error feature indicators of simulation models and ideal system are extracted based on the feature extraction method of error analysis.Weight distribution is conducted by using the objective assignment which is dependent upon design goal,and correlation degree is calculated of the weighted grey correlation model.A reasonable motion trajectory feature index system and integrative evaluation model are built.Finally,the proposed method is applied to analyze the motion trajectory of the feed mechanism of lockstitch sewing machine as a practical example.The relationship between assembly model and ideal system is judged based on the result of analysis,and the evaluation of feeding performance is thus effected.The effectiveness and feasibility of the proposed method is verified.