Abstract: Stitching technology was widely used because it can effectively reduce delamination failure and improve impact damage tolerance of composites such as glass fiber. Comparing and analyzing the current stitching technology, a new one-side stitching device which has the features of double-thread reinforcing and stitching with variable angle is designed in this paper. Theoretical analysis on the double-needle cooperation was performed to verify that it meets the principle of stitching work. And then, the kinematic cooperative movements of the various mechanisms were analyzed to provide theoretical guidance for the debugging and use of the device. In the experimental part, the effects of the angle of the double needle on the success rate of the stitching was firstly studied. It shows that the larger the angle is, the higher the success rate is and the stitching device can basically meet the demand of stitching work. And then, the effects of other stitching parameters on stitching were investigated. It shows that the increase in the thread diameter is not conducive to stitch and the increase in the needle diameter is conducive to stitch, and it needs to reasonably select stitching parameters. Supporting with slotted is more effective than supporting with foam when stitching, but the success rate of support with foam can reach 94.3%, which still has research and application value.

Key words: one-sided stitching, stitching with variable angle, double-needle cooperation, cooperative movements, experimental research, composites