| 摘要 |
A pressurized gas for carrying a looper thread by gas is generated by a gas supply pump which is operated by changing over a sewing-machine motor, which drives a stitch forming device, and the looper threading is performed through loopers by one-touch operation. A gas carrying threading device of sewing machine, comprising: a looper thread introduction mechanism (110) which inserts a looper thread which is guided to loopers (7, 8, 9); a hollow looper thread guide (130) which extends from the looper thread introduction mechanism to looper thread inlets (7a, 8a, 9a) and has looper thread guide outlets (7d, 8d, 9d); a gas supply pump (41) for performing the looper threading by carrying the looper thread by gas from a looper thread introduction area through the hollow looper thread guide to looper thread loop-taker point outlets (7b, 8b, 9b); a clutch (60) for respectively transmitting the power from the sewing machine motor M to a drive shaft (5) which drives a stitch forming device (30) including the loopers at the time of the stitch formation or to the gas supply pump at the time of the looper threading; and a looper threading/stitch forming changeover mechanism (90) for changing over the clutch so that the transmission of the power to the stitch forming device is interrupted and the power is transmitted to the gas supply pump at the time of the looper threading and the power is transmitted to the stitch forming device and the transmission of the power to the gas supply pump is interrupted at the time of the stitch formation. |
