Sewing 1 State Practice Test

The mechanism that holds and guides the bobbin is the bobbin case. It sits in the bobbin area under the needle plate and keeps the bobbin in place while providing the lower thread with proper tension through its spring and hole system. This tension is essential because it works with the upper thread tension to form balanced stitches.

The bobbin winder, on the other hand, is only for winding thread onto the bobbin before sewing; it isn’t used to hold the bobbin during stitching. The spool pin supports the thread spool on top of the machine, not the bobbin itself. The needle plate covers the feed dogs and needle area and does not hold the bobbin.