(57) In a circular knitting machine of the type having two needle beds or needle-carrying
structures (1,8) for knitting plain and purl stitches, the lower needle-carrying structure
(1) comprises a cylinder and the upper needle-carrying structure (8) has a substantially
bell-like shape and needle tricks (11) of arcuate shape for correspondingly arcuately
bent needles (13). The arcuately bent needles (13) are controlled by selecting jacks
(12), in turn controlled by cams (18) arranged around the substantially bell-like
structure (8). Such a machine can have the same number of needles (3,13) on both needle-carrying
structures (1,8), and accordingly, a higher fineness for a given diameter than traditional
cylinder and dial machines. It also enables knitting loops to be transferred between
all of the needles (3,13) in the two structures (1,8), ' both from the purl stitch
side to the plain and from the plain stitch side to the purl, thus enabling the knitting
of various types of rib pattern, such as 1:1, 2:2, etc., without requiring any jack
replacement.
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