What types of sewing machines exist?
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Two types of machines, the lockstitch and the chain-stitch, operate on the same principle; an eye-pointed needle, raised and lowered at great speed, pierces the material lying on a steel plate, casting a loop of thread on the underside of the seam. In the lockstitch machine a second thread, fed from a shuttle under the plate, passes through the loop and is interlocked with the upper thread as it is drawn tightly up by the rising needle. In the chain-stitch machine, which uses a single thread, the loop is held under the seam while the needle rises, the cloth is fed forward, and the needle descends again, engaging the loop and drawing it flat under the cloth.
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