stitch machines can accommodate at most two bobbin cases under the presser foot, one positioned to the left of the needles and one positioned to the right. This effectively limits lock stitch machines to having at most two needles.) Finally, double chain stitch is found in bulk material packaging, where it is used to close large bags. As this stitch can be easily unraveled, this permits easy opening of bags sewn shut in this manner.

Machine stitch gallery

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