Sewing Machine Parts, Controls and Safe Operation
What the exam tests
This domain checks whether you can name and locate the main parts of a single-needle lockstitch machine, use its controls correctly, and keep your hands and eyes safe while sewing. Questions often give a part's function or an unsafe habit and ask what to do next.
Parts and controls
- Spool pin holds the thread; the thread guide above it prevents tangling.
- Tension discs grip the upper thread; the take-up lever must be threaded or no stitch forms.
- Needle bar carries the needle; the clamp screw holds it with the flat side correctly facing.
- Presser foot holds fabric against the throat plate; the feed dogs below move the fabric.
- Bobbin case sits in the shuttle/hook; the stitch-length regulator sets millimetres per stitch; the reverse lever locks backstitching.
- The foot pedal controls speed; on most domestic machines the handwheel turns toward you (counter-clockwise).
Safe operation rules
Unplug before changing a needle, bobbin or presser foot. Keep fingers at least 2 cm from the needle path, guide fabric with a stiletto or awl, and never sew over pins. Tie back hair, avoid loose sleeves and jewellery, wear closed shoes. Stop with the needle down when turning a corner. Do not pull fabric; the feed dogs move it. Fit the needle guard where supplied.
Worked example
The machine makes a loud knock and the needle bends. Reasoning: likely causes are pulling the fabric, a needle too fine for the fabric, or the needle hitting the throat plate because it is not pushed fully into the clamp. Correct action: switch off and unplug, raise the needle bar, loosen the clamp screw, remove the needle, fit a new needle with the flat side back, push it fully up, tighten, and test on scrap.
Traps that cost marks
Turning the handwheel away from you; threading or cleaning with the plug in; dragging thick fabric through by hand; sewing over pins; choosing speed over control.