The sinker loop (S in Fig. 5.1) is the piece of yarn that joins one weft knitted needle loop to the next. On bearded needle weft knitting machines, loop-forming sinkers form the sinker loops in succession between the needles - hence the origin of the term sinker loop. On latch needle weft knitting machines, however, the sinker loops are automatically formed as the needles, in succession, draw their new loops.
Sinker loops show on the opposite side of the fabric to the needle loops because the needle loop is drawn onto the opposite side from which the yarn was originally fed. The terms 'sinker loop' and 'needle loop' are convenient descriptive terms but their precise limits within the same loop length are impossible to exactly define.
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