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Anyone who sews knows how annoying it is when the bobbin runs out of thread--especially when you only notice a few hundred stitches later. Pins get removed, and the abrupt end in thread can't be backstitched.
A small rotation sensor installed in the bobbin's spindle detects when the bobbin no longer
turns when the machine is running. It can trigger an alarm, or bring the stitching to a halt. The user can then rewind the bobbin without losing their place in the fabric.
More advanced models can measure the amount of bobbin thread dispensed (accounting for the decreasing diameter of the winding), and can alert the user right before the thread is expected to end. Even a countdown of linear stitches remaining could be displayed.
||This is baked crispy. Google "low bobbin
||Perhaps then, [nomocrow], the idea could be modified to be an apple sensor for the edge of a water-filled tub to alert you when your... wait for it... bobbin for apples.
||Maybe it could be used as a motion sensor
help you detect punches. This would help
boxers perfect their bobbin weave.
||Blimus!, [Aq_Bi], Where you been?