I just came across this graphic illustrating how a bobbin catches the thread in a sewing machine, forming the bottom stitch and locking it in place with the top thread.
It's absolutely fascinating to watch and after a few rotations its obvious why timing is so important in a sewing machine. If either the needle or the bobbin is just a tiny fraction of a second out of sync you can see why this would go horribly, horribly wrong.
My question now is how does it work with oscilating rather than rotating bobbins such as you see on most side loading machines?
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Good question. I may have to have a peek at my antique BSM... I guess the blue thread is the bottom one? so it just needs to be in the right place at the right time.
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