Specific, proprietary spools designed for Bernina sewing machines hold the lower thread supply and play a crucial role in the stitch formation process. These small, often metal or plastic cylinders are loaded with thread and inserted into a designated compartment beneath the needle plate, working in conjunction with the upper thread to create various stitch patterns.
The correct type and quality are essential for smooth, consistent stitching and preventing thread jams or breakage. Using the appropriate type ensures compatibility with the machine’s tension system and timing, optimizing performance and preventing damage. Historically, bobbin design has evolved alongside sewing machine technology, improving thread delivery and stitch consistency. Choosing high-quality options minimizes friction and ensures even thread flow, contributing to a professional finish.