Pip 'Sewing'

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• Author: rossprovocative

Tags: Sewing machines  yoyos 

While trying to wrangle an animated gif I saw describing the essence of sewing machines, Pip offered assistance. Pretending the far half of the yoyo tail is a separate string, his steps are topologically equivalent to en.wikipedia.org The point here is that, in the gif, the bobbin (green spool) is magically fixed hovering in the air somehow, which allows the yellow loop to pass around it. Whereas with Pip's bobbin (the yoyo), he would lift the yoyo off his leg to pass the loop around. I'm still trying to understand how, in a real sewing machine, the bobbin stays "fixed" (that is, though free to rotate, it doesn't change location), while still allowing a loop of string to pass around it. If it were attached to the sewing machine by an axle, the loop wouldn't be able to pass all the way around; it would stop at the axle (ie, Pip's demo would fail if the yoyo were attached to an axle on his leg). Of course in a sewing machine you don't have a dexterous pair of hands doing the work of lifting the bobbin at the right moment; it's all mechanical. And flummoxing.