Bobbin
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A small spool that holds the lower thread supply, fitting into the bobbin case beneath the needle plate to form the underside of a lockstitch.
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See also
Bobbin case
A metal or plastic holder that houses the bobbin and regulates lower-thread tension via an adjustable spring before the thread reaches the needle plate.
Bobbin winder
A spindle and motor mechanism on a sewing machine that winds thread evenly onto an empty bobbin, usually engaged by disengaging the main stitching mechanism.
Reverse lever
A control that, when engaged, reverses the feed dog direction so the machine sews backward, commonly used to lock stitches at the start and end of a seam.
Handwheel
The wheel at the right end of a sewing machine that manually raises and lowers the needle and can be turned to advance a single stitch.
Needle bar
The reciprocating vertical bar that holds the needle clamp and drives the needle up and down through the fabric with each stitch cycle.
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