Lockstitch
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A lockstitch is the most common mechanical stitch made by a sewing machine. The term "single needle stitching", often found on dress shirt labels, refers to lockstitch.
Correct and incorrect thread tension
Overlock
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An overlock is a kind of stitch that sews over the edge of one or two pieces of cloth for edging, hemming, or seaming. Usually an overlock sewing machine will cut the edges of the cloth as they are fe
Lockstitch
…opening the door to the very popular category of programmable household embroidery machines. Most home sewing machines are lockstitch machines, although overlockers (aka sergers) have entered the home market since the 1980s. A lockstitch can also be performed by hand using a sewing awl. Of a typical garment factory's…
The purl stitch.
An overlock machine.
A Zoje 5 cone industrial overlocker
1-thread, 5⁄8 in (16 mm) wide, 12 stitches per inch (2.1 mm stitch pitch)