In order to solve the problem that an embroidery machine generally uses a straight needle and rotary shuttle to form a lock stitch, which results in the low supply of bobbin thread and frequent bobbin changes, a bobbin thread-hooking mechanism with spatial four-bar linkage is proposed which can achieve a continuous supply of bobbin thread. We provide a reference for solving this embroidery machine practical problem with a spatial four-bar mechanism optimal design method.

In the early stage of the creative design of mechanisms, design work was accomplished mainly based on researchers' experience and inspiration, resulting in a low design efficiency. Moreover, the derived mechanism configurations were very limited. An effective mechanism design method is based on the atlas of topological structures of kinematic chains. Our research on the structural synthesis of kinematic chain inversions plays an important role in the improvement of mechanism design efficiency.