Single-cylinder circular hosiery knitting machine with device for making ribbed knitwear fabrics

A single-cylinder circular hosiery knitting machine fitted with a device for producing ribbed knit-wear articles by a process including the step of shifting knit loops, comprising a vertical-axis cylinder including vertical needles axially displaceable under the control of cams of a cylinder cam box and also including stitch sinkers, a plate or disc coaxially overlying the cylinder and including horizontal needles which can be pushed radially under the control of cams of a plate cam box, means for driving said cylinder and said plate in synchronous rotation about their common axis, wherein each couple of needles composed by a vertical needle and its corresonding horizontal needle is arranged on the same radial plane and wherein each horizontal needle has its shank bent through substantially 90.degree. and is fastened by the bent end of the shank to the bottom end of an L-shaped selector member guided by its horizontal portion within a radial slot of the plate, and wherein said shank includes a bevel adjacent said bend to deflect each said vertical needle from said radial plane during the centripidal movement of each said horizontal needle, the cams of the plate cam box being capable of acting upon butts projecting from the horizontal portion of said selector members, and at least one of said cams of said plate cam box being capable of originating movements of said selector members having horizontal needles fastened thereto in the centrifugal direction through such a distance as to bring the bent shanks of the horizontal needles to a position which is radially external with regard to the vertical movement paths of the corresponding vertical needles, whereby said horizontal needles do not interfere with said vertical needles except during the deflection of said vertical needles provided by said bevels during centripidal movement of said horizontal needles during shift of loops from said horizontal to said vertical needles.