jacks the selectors move within a cylinder trick portion which lies at a greater distance from the cylinder axis than the trick portion within which the needle and jacks move and comprise an appendix extending towards the cylinder for engaging the jacks the machine can have a larger number of selection positions than known machines for the same needle circle diameter and fineness application_number US 5321793 A description with reference to said figures a single cylinder circular knitting machine 1 in particular of the small diameter type for stocking manufacture comprises a cylinder 2 provided in known manner with vertical longitudinal tricks 3 in which needles 4 jacks 5 and underlying selectors 6 slide the cylinder 2 is supported rotatably while a fixed structure indicated overall by 7 surrounds the cylinder 2 and carries the control cams for the needles jacks and selectors 6 these cams being indicated overall by 8 as will be described in detail hereinafter these cams act on butts 9 on the needles 4 on butts 10 on the jacks 5 and on a shoulder 11 on the selectors 6 the selectors 6 which are of rocker type comprise in known manner pattern butts 12 and a control butt 13 to follow the contour of substantially triangular cams 14 fixed to a fixed structure 15.