| 摘要 |
The present invention is an automatic thread cutting device for a sewing machine, which is equipped with an automatic thread cutting device on the position that a needle thread passes through. The automatic thread cutting device comprises a main body that is equipped with a worm gear rod of active piece actuated by a motor of driving piece, wherein the active piece is engaged with a worm gear denture of passive piece that motivates a thread hooking member, a knife base with a knife is fixed on the main body and cooperates with the thread hooking member to cut a needle thread. Thus the size of the whole device can be minimized effectively to fit in the small space of a sewing machine, and then the objective of effort-saving and fast thread cutting is attained.
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