started along the 34 floating 34 track 13 the sliders 4 which on the contrary have been correctly directed to this track 13 since uninvolved in knitting at the feed immediately following the transfer area are also subjected to the action of the cam 21 wherefor they advantageously bring their respective needles to the latch opening position to be then lowered once again by the successive cam 23 to the level of the 34 floating 34 track 13 without ever going to a transfer proper since no selecting jack 6 is provided for them in the raise phase along the cams 9 track the auxiliary cam 21 may be either radially movable or stationary and may be arranged at the level of the track 13 as shown in full lines in fig2 or alternatively at a different height as shown in dotted lines whereat it acts on the butt 4b of the slider 4 to cause the latter to complete the same movement as described above the invention as described hereinabove also reduces the pattern drum preparation time as it is no longer required that the safety pins be set on these drums the resulting advantage in relation to the elimination of possible errors as well is evident obviously the invention may find application also on different machines from the one considered for example on machines set.