A rotary hook is a key component used in certain types of sewing machines, particularly in industrial and heavy-duty machines. Its primary function is to create a stitch by interlocking the upper thread with the lower thread (bobbin thread). Here’s how it works: 1. **Rotation**: As the sewing machine operates, the rotary hook continuously rotates around the needle. This motion allows it to catch the upper thread at the right moment as the needle penetrates the fabric.
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