Abstract:

The improved mechanism for sewing machine for sewing carbon fiber cloth is designed to sew carbon fiber laminated fabric effectively and reduce the problem of disconnection in sewing process. The key point in this design is to relax the sewing thread by periodic take-up via a fork and a circle. The fork and circle cooperate the  sewing needle to reduce the shear stress in sewing thread, avoid the problem of disconnection and ensure the coherence of sewing and finish the sewing work. Three dimensional modeling and assembling are performed based on the Pro/Engineer software. And then to design a gear, cam, fork, circle and other key parts are designed, and the displacement, velocity and acceleration for the fork and circle in the Pro/Engineer’s mechanism module are analyzed. The result show that the modified mechanism can run smoothly and stably, and satisfy the demand of the expected design. It will reduce broken line rate and improve production efficiency by the modified mechanism.

Key words: laminated carbon fiber cloth, sewing machine mechanism modification, three-dimensional simulation, component kinematic analysis