Two Sets of Needles
Double knit fabrics are produced from two sets of needles. The second set of needles is arranged in a dial above the cylinder, with the same gauge as the cylinder.
On a double knitting machine, the needles are “gaited”—the needles in the dial and the cylinder are spaced in relationship to each other. With rib gaiting, the two sets of needles are not directly opposite each other but are staggered. This means that the needles can be used at the same time.
With interlock gaiting, the needles in the dial and the cylinder are placed directly opposite each other. This means that they cannot be used at the same time. Therefore, it takes at least two machines to make any fabric with interlock gaiting.