Answer:
Bobbin and Bobbin Case
The bobbin is wound with the thread that will make up the underside of a machine stitch. Machines have either a top drop-in style of bobbin (like the one shown), or a front-loading bobbin. The bobbin case holds the bobbin. It is usually not interchangeable between machines. Use only bobbins recommended by the manufacturer for your particular model, or the machine may not work properly.
Slide Plate or Bobbin Cover
Depending on the machine, a slide plate or hinged bobbin cover allows access to the bobbin.
Presser Foot
This removable foot keeps fabric in place as you sew. Different feet are appropriate for different sewing techniques or fabrics. For example, a zipper foot is used to install a zipper, and a roller or nonstick foot for sewing leather and oilcloth smoothly.
Needle and Needle Clamp
Sewing-machine needles are removable and come in a variety of sizes. (For more on machine needles, see our guide.) As its name implies, the needle clamp holds the needle in place.
Throat Plate
This metal plate, sometimes called a needle plate, sits below the needle and presser foot. A small opening in the plate allows the bobbin thread to come out and the needle to pass through to make stitches. Most throat plates have small lines notched to the right of the presser foot; these serve as guides for seam allowances and for sewing straight lines. The plate can be removed to clean underneath
Explanation:
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