Sewing Machine "Theory of Operation"
A picture is worth a thousand words.
The following diagram shows how a machine like the ones
I have produces a lock stitch.
My hat is off to whoever put together the following GIF file:
If I could just add a button to stop and start it, it would
There are numerous fine points of course. The upper and lower
threads need to be properly tensioned and handled. The needle
has a groove on one side and not the other.
Another type of machine generated stitch is the chain stitch,
which does not require a second thread on a bobbin.
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