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Of a typical garment factory's sewing machines, half might be lockstitch machines, and the other half divided between overlock machines, chain stitch machines, and various other specialized machines. Industrial lockstitch machines with two needles, each forming an independent lockstitch with its own bobbin, are also very common.
A needle feed, used only in industrial machines, moves the material while the needle is in the material. In fact, the needle may be the primary feeding force. Some implementations of needle feed rock the axis of needle motion back and forth, while other implementations keep the axis vertical while moving it forward and back.
The majority of sewing machine needles are made of various grades of hardened steel coated with either nickel or chromium, though certain specialty needles are coated with titanium nitride on top of chromium. Titanium nitride is a reflective golden-colored ceramic material which reduces abrasion allowing the needle to stay sharper longer and ...
Singer made an attachment similar to its buttonholer, and using a similar needle-clamp-powered locomotion, in order to confer some zigzagging ability on its straight-stitch machines. Of the variety of "Singer Automatic Zigzagger" attachments produced over the years, two are compatible with 27-series machines: Singer part numbers 160985 and 161102 .
The early 1990s were quiet for machine embroidery, but Tajima introduced a 12 needle machine into their series along with a noise reduction mechanism. In 1995, Tajima added a multi-color (6-color) type to chenille embroidery machines and announced the ability to mix embroidery machines with plain chenille embroidery.
Complete garment knitting requires two needle beds for three-dimensional structures (such as clothing). As is the case with all fully fashioned knitting, machines require individual single needle selection (through electronic control) and presser feet (to hold down formed loops).
The standard gauge 200-needle machine can knit the finest yarns up to a good sport-weight (4ply UK), while the heavier yarns knit better on a mid-gauge or bulky knitting machine. Machine knitting saves a considerable amount of time but does require learning to operate the machines correctly.
An overlock sewing machine differs from a lockstitch sewing machine in that it uses loopers fed by multiple thread cones rather than a bobbin. Loopers serve to create thread loops that pass from the needle thread to the edges of the fabric so that the edges of the fabric are contained within the seam.
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