| 摘要 |
PURPOSE: A bobbin cover case which enables rapid rotation with low noise by precisely coupling a wire guide, a pressure controlling plate, and a spring is provided. CONSTITUTION: A bobbin cover(60) contains a bottom thread bobbin and is mounted at the lower portion of the needle plate of a sewing machine. A bottom thread guide device guides the bottom thread to pass through the upper portion of the bobbin cover and guides to the needle holes of the needle plate. A bobbin guide(10) covers the bottom thread guide device. |
