Abstract

Disclosed herein are a lower-thread supply device of sewing machine and a sewing method. The device includes a bobbin case (300) having an outlet (330) from which lower thread is drawn out, and a needle through-hole (340) through which a needle (600) moving downwards with upper thread (a) being fitted passes, and a hook body (200) in which the bobbin case (300) is mounted, the hook body being installed to be rotatable by a power device of a sewing machine, guiding upper thread (a2) on a sewn fabric side to a front area of the bobbin case (300) while catching and dragging the upper thread (a) via a hook (210), and guiding upper thread (a1) on a spool side to a rear area of the bobbin case (300). The bobbin case (300) is installed not to be rotated when the hook body (200) rotates.

IPC Classes  ?

• D05B 57/28 - Applications of bobbins for storing the lower thread
• D05B 57/08 - Loop takers, e.g. loopers, for sewing machines for lock-stitch sewing machines
• D05B 57/26 - Bobbin holders or casingsBobbin holder or case guardsBobbin discharge devices
• D05B 1/12 - Lock-stitch seams
• D05B 49/00 - Take-up devices, e.g. levers, for the needle thread of sewing machines