A bobbin is a small spool of thread used in sewing machines, located beneath the needle plate. Different sewing machine manufacturers, including Janome, often require specific bobbin styles or classes for optimal performance. The dimensions of these components, including width, depth, and overall diameter, are crucial for proper thread tension and stitch formation.
Correct bobbin dimensions ensure smooth operation and prevent jams or thread breakage. Using an incorrectly sized component can lead to inconsistent stitching, fabric damage, or even mechanical problems within the machine. Understanding these specifications contributes to efficient sewing and extends the lifespan of the machine. Historically, bobbin sizes have been standardized to some degree, but variations exist across brands and models, necessitating careful selection.