I can’t get my head around how a sewing machine sews a hem on material when it just a needle with some thread poked through it stabbing the material in a line. How does that then make the thread loop back under the material to create a hem on both sides?
In: Engineering
there’s a small spool of thread in the base called a bobbin. when the needle goes down a hook grabs the tread off it and loops it around the bobbin spool. then when the thread is pulled right and the needle goes back up the bobbin thread is through the needle thread. tension on the thread is adjusted to make sure this crossing winds up in the middle of the fabric and you get a neat stitch.
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