| 摘要 |
In a looper thread control device for a double chainstitch sewing machine, the sewing needles are lowered securely into a thread triangle, even under the conditions of low thread tension and high speed operation, and with an elastic looper thread, without rib formation or skipped stitches in the fabric. A looper thread support member 1 moves up and down in cooperation with sewing needles NL, NR near the left end of the looper L. The looper thread support member 1 enters into the triangle prior to the descent of the sewing needles, and seizes the looper thread LT. The looper thread support member 1 holds the looper thread until the eyelet LE on the looper moves to the right side of the looper thread support member 1, thereby pulling out the looper thread LT from the thread source, and then releases the looper thread.
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