Bobbin winding is the process of winding the bottom thread, necessary for sewing, onto a small bobbin. A sewing machine uses two threads to form a stitch: the top thread, which is fed from a large spool, and the bottom thread, which unwinds from this small bobbin located in the lower part of the machine, in what is called the bobbin case. Most machines have a built-in bobbin winder for this purpose. An empty bobbin is placed onto it, the thread is wound around it a few times, and a mechanism is started that winds it evenly and firmly. A correctly wound bobbin is a prerequisite for a quality stitch without the bottom thread tangling or coming loose.
