| 摘要 |
The present invention relates to a lower thread supply apparatus in which, unlike existing methods, if a rotating hook (310) passes through and drags a "U" shaped loop of an upper thread made when a needle descends to the lowest point and rises during a sewing process, and the upper thread is hooked upward through thread take-up of the rising needle, an upper thread (a) at the front side from the perspective of the hook (310) is dragged by an upper thread hanging protrusion (820), passes through the front region of a cap (500) through thread take-up, and entwines around a lower thread to form a noose, and simultaneously an upper thread (b) at the rear side from the perspective of the hook (310) passes through the rear region of a hook body (300) and escapes from a gap between a power transfer protrusion part (210) and a power transfer protrusion reception part (320) to form a lower thread and a stitch, the lower thread supply apparatus being characterized in that the upper threads intersect in an "X" shape during a sewing process and are perfectly coupled with the lower thread; thereby, twisting of the upper threads does not occur unlike existing methods, and therefore stitches do not come undone and puckering is greatly reduced. |
