Friday 22 February 2013
Stitch Formation in a Long Bobbin Machine
This is a Singer 28K. I have removed the front and back slide plates and put a narrow strip of material under the foot to take the stitches. The top thread is pink and the bobbin thread green.
When the needle goes down under the needle plate it forms a loop just at the very moment the shuttle is moving forward in the shuttle carriage. The point of the shuttle is aimed straight through the loop.
Then the whole shuttle passes through the loop.
The top thread glides under the shuttle.
Once the shuttle has passed through the loop, the needle takes the top thread back up again, the loop is tightened, and the bobbin thread is held firmly in place on the underneath of the material.
It was years before I understood what was going on underneath with the shuttle. I read a description online, complete with diagrams, but still couldn't fathom it out, until one day I was trying to sort out a problem with a transverse shuttle machine and was looking from underneath and I actually saw it happen. Truly a moment of revelation.
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