Circular knitting machines for the production of hosiery with double, outwardly turned-over welts

Claim 1

IN A CIRCULAR KNITTING MACHINE FOR THE PRODUCTION OF HOISERY WITH A DOUBLE, OUTWARDLY FOLDED-OVER WELT AND WHICH COMPRISES A ROTATED CYLINDER CARRYING A SET OF LATCH TYPE NEEDLES THAT ARE AXIALLY MOVABLE AND ALTERNATELY HAVE LONG AND SHORT BUTTS, RADIALLY MOVABLE SINKERS LOCATED BETWEEN THE NEEDLES AND EACH HAVING A CAST-OFF LEDGE AND AN ADDITIONAL RADIALLY OPENING GROOVE BELOW SAID LEDGE, A THREAD GUIDE FOR FEEDING THREAD TO THE SUCCESSIVE NEEDLES, A NEEDLE LIFTING CAM ENGAGEABLE WITH SAID BUTTS OF THE NEEDLES FOR RAISING THE LATTER TO A LEVEL AT WHICH THE NEEDLES CAN ENGAGE THREAD FED BY THE GUIDE, A NEEDLE WITHDRAWING CAM ACTING ON THE BUTTS OF THE NEEDLES FOR EFFECTING DOWNWARD MOVEMENT OF THE LATTER AFTER ENGAGEMENT OF THE NEEDLES WITH THE THREAD, A SINKER CAM RING CONTROLLING THE RADIAL MOVEMENTS OF THE SINKERS AND HAVING A PORTION EFFECTING RADIALLY OUTWARD MOVEMENT OF THE SUCCESSIVE SINKERS UPON SAID DOWNWARD MOVEMENT OF THE ADJACENT NEEDLES BY SAID WITHDRAWING CAM: THE COMBINATION OF AN ADDITIONAL NEEDLE CAM SPACED FROM THE LOWEST PART OF SAID WITHDRAWING CAM IN THE DIRECTION OF ROTATION OF SAID CYLINDER AND SELECTIVELY ENGAGEABLE WITH THE NEEDLE BUTTS TO EFFECT DOWNWARD MOVEMENT OF THE NEEDLES BEYOND THE LOWERMOST POSITION TO WHICH THE NEEDLES ARE MOVED BY SAID WITHDRAWING CAM, AN ADDITIONAL SINKER CAM SPACED FROM SAID PORTION OF THE SINKER CAM RING IN THE SAME DIRECTION, AND BY A CORRESPONDING DISTANCE AS SAID ADDITIONAL NEEDLE CAM WITH RESPECT TO SAID WITHDRAWING CAM, SAID ADDITIONAL SINKER CAM BEING SELECTIVELY ENGAGEABLE WITH THE SINKERS TO EFFECT RADIALLY OUTWARD MOVEMENT OF THE LATTER BEYOND THE MOVEMENT THEREOF BY SAID PORTION OF THE SINKER CAM RING,