butt 44 the butts of the selector jack 4 are adapted to cooperate with the portion of the cam system comprising box cam rings 19 and 20 briefly the movement of the needle 1 is obtained on the one hand by 34 selecting 34 appropriate ones of selector jacks 4 causing it to move into engagement with the intermediate jack 5 which causes it to rise into engagement with the needle jack 6 causing the butts for the needle jack to ride in the cam system of the secondary feed yarn system ii or on the other hand by 34 not selecting 34 certain ones of the selector jacks 4 and thereby not raising the intermediate jack 5 causing the intermediate jack 5 to ride in its portion of the cam system which does not move the needle jack until the system reaches the primary feed system i thus a single choice of the position of selector jack 4 determines needle movement in yarn feed i and ii the selection of the selector jacks 4 is obtained by means of the operation of a set of pressbuttons p arranged transversely of the direction of movement of the system at a point in the system ahead of the main feed i the pressbuttons p are actuated by a patterning drum or electronic pattern system of conventional design which is not shown on operation of the patterning drum for example one or more of the pressbuttons are pushed forwardly out of the plane of the cam.