| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a thread routing mechanism for a needle-switchable type sewing machine.SOLUTION: A thread routing mechanism for a needle-switchable type sewing machine is applied to a sewing machine including a needle bar switching mechanism and includes a thread take-up lever, an annular needle bar cartridge, and a plurality of sewing threads. The thread take-up lever includes a swing end and a thread take-up end including a plurality of thread holes. The annular needle bar cartridge includes a rotation axis and a plurality of spaced needle bar holes, and a through space is formed in the inside thereof. A distance between each needle bar hole and the rotation axis is equal. A needle bar including a sewing needle is accommodated in each needle bar hole. A needle hole is provided in each sewing needle. The plurality of sewing threads are each passed through a thread route constituted by the combination of the thread hole of the thread take-up lever, the through space in the annular needle bar cartridge, and the needle hole in the sewing needle in order. The length of the sewing thread after the passage through the thread routing mechanism does not change after the change of a needle bar position.</p> |
