Apparatus for the electronically controlled three-position electromagnetic selection of needles for circular knitting machine with alternate motion

An apparatus for the electronically controlled three-position electromagnetic selection of needles for a circular knitting machine with alternate motion comprising:

• a needle cylinder including needles, underneedles connected to said needles and pusher jacks engageable with said underneedles;
• oscillating selector means for needle section including oscillating selectors cooperating with pressure cams;
• first and second electromagnets, each electromagnet being interposed between two permanent magnets for the selection of the oscillating selectors;
• a first cam for driving the pusher jacks to a lower position for a retained stitch;
• a second cam for driving the underneedles into the upper position for a discharged stitch;
• a third cam for driving the needles upon the formation of a stitch;
• said pusher jacks including a straight body with upper and lower ends each formed heel-shaped;
• a spring positioned adjacent said pusher jack for urging said pusher jack outwardly from said needle cylinder;
• said oscillating selectors are disposed vertically superimposed and symmetrically arranged with respect to a horizontal separation line, each oscillating selector including a convex portion turned toward a portion of the pusher jack and including heels directed outwardly of the needle cylinder, an end heel of each oscillating selector being provided for the contact with a pressure cam and with a spacer ring respectively, and an intermediate heel of each oscillating selectors being provided for magnetic attraction by a corresponding one of said electromagnets and associated permanent magnets;
• said electromagnets are disposed superimposed on the same vertical plane, each electromagnet having poles juxtaposed to a corresponding said intermediate heel;
• said pressure cams are disposed substantially aligned vertically and substantially lined up with the axis of said electromagnets;
• and
• said cam is provided for the displacement of the upper heel of pusher jacks and of the superimposed heel of underneedle.