The Loop Stitch

Posted on January 12, 2008  Comments (0)

The how stuff works site does a great job of providing interesting explanations of. un-surprisingly, how things work. The design of of the web site is less good, in my opinion – way to much non-content (the content fills up maybe 15% of my screen on this link for example (once I scroll down it might improve to about 30% content): The Loop Stitch:

The most important element of a lock-stitch mechanism is the shuttle hook and bobbin assembly. The bobbin is just a spool of thread positioned underneath the fabric. It sits in the middle of a shuttle, which is rotated by the machine’s motor in synch with the motion of the needle.

Just as in a chain-stitch machine, the needle pulls a loop of thread through the fabric, rises again as the feed dogs move the fabric along, and then pushes another loop in. But instead of joining the different loops together, the stitching mechanism joins them to another length of thread that unspools from the bobbin.

When the needle pushes a loop through the thread, the rotary shuttle grips the loop with a hook. As the shuttle rotates, it pulls the loop around the thread coming from the bobbin. This makes for a very sturdy stitch.

See the site for a graphic that does a much better job of making it clear, how it works, I think.

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