| 摘要 |
A bobbin case is provided to prevent the unintentional flowing of a thread tension spring, thereby forming well-looking stitches, by using a lower thread guide part for guiding a lower thread extending out a lower thread exit. A bobbin case(4) is detachably attached to a full rotary hook(1), which forms stitches together with a sewing needle(6) of a sewing machine. The bobbin case has a lower thread bobbin for winding a lower thread thereon. The bobbin case includes an outer circumferential wall, which is formed at a lower thread exit through which the lower thread is outwardly inputted, and a thread tension spring for applying tension to the lower thread moving out the lower thread exit. The bobbin case further includes a lower thread guide part, which is mounted separately from a front part of the bobbin case, and an imaginary line extended from a vertical movement trace of the sewing needle. The lower thread guide part guides the lower thread extending out the lower thread exit. Further, the lower thread guide part contains a hole for inserting lower thread.
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