Differential feed
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A serger or coverstitch feature using two independently adjustable feed dogs, front and back, to stretch or gather fabric as it feeds, preventing waves or puckering.
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See also
Chain stitch (coverstitch)
A looped stitch formed by a single needle thread interlocking with a looper thread in a chain-like pattern beneath the fabric, used alone or alongside cover stitching.
Flatlock stitch
A serger stitch sewn with loose tension so the seam pulls flat and open, leaving a ladder of thread on one side, often used decoratively on knits.
Looper
A hook-like mechanism on an overlocker or coverstitch machine that carries thread beneath the needle plate to interlock with needle threads, forming the stitch's underside.
Overlocker
A machine that simultaneously trims a fabric edge and encases it in interlocking looped thread, using multiple threads, needles, and loopers to finish seams quickly.
Coverstitch machine
A machine that sews two or three parallel rows of straight stitching on top with interlocking looper threads underneath, used for hems and flat seams on knits.
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