A device for selecting dial plate needles in a circular knitting machine for manufacturing ribbed fabric, comprising:
- a frame (18);
- a cylinder (10) rotatably mounted to said frame;
- a plurality of vertical needles (11) mounted on said cylinder;
- a dial plate (16) having a plurality of radial horizontal needle grooves and mounted for rotation with said cylinder;
- a plurality of horizontal needles (15) each mounted in one horizontal needle groove of said dial plate, each needle having a butt (20) and a rear tail (21) extending radially inwardly toward a center of said dial plate;
- a stationary cover (22) connected to said frame and disposed over said dial plate, said cover having an annular track (25) for receiving each needle butt (20) and for holding a horizontal needle connected to each butt in a radially inward rest position, said cover including at least one cam means (26) for engaging horizontal needle butts to move horizontal needles radially outwardly during a looping operation, and another cam means (27) for engaging horizontal needle butts to move horizontal needles during a mesh transferring operation for transferring a mesh to said vertical needles, said cover including further cam means (37), (46), (47);
- a sleeve (30) rotatably mounted to said frame and above said dial plate for rotation with said dial plate, said sleeve including a plurality of vertical grooves each coinciding with a horizontal needle groove of said dial plate;
- a plurality of jacks (32) each mounted for vertical sliding movement and radial swinging movement in one of said vertical grooves of said sleeve, each jack having a vertical edge with a row of teeth (38) therealong, each jack having a bifurcated bottom end with a long leg (35) extending toward and engaging in a horizontal needle groove of said dial plate radially inwardly of a corresponding horizontal needle (15) to act on a tail (21) of a corresponding needle, and a short leg (36) extending for engagement with said further cam means (37, 46, 47) of said cover (22), said further cam means controlling the swinging movement of said jacks when said jacks are in operating positions thereof,
- a plurality of selecting slides (39) mounted to said frame and cooperating with teeth (38) of said jacks (32) to control the selecting of vertical displacement of said jacks (32) from a rest position of each jack to said operating position of each jack;
- and
- at least one pin drum (42,44) mounted for rotation to said frame and rotatable with said cylinder, sleeve and dial plate, for selective displacement of said selecting slides (39) toward and away from said teeth (38) of said jacks (32), said pinned drum controlling said selecting slides to selectively move said jacks from said rest position to said operating position of said jacks, said further cam means operating to move selected horizontal needles outwardly for selectively engaging said at least one cam means (26) and said other cam means (27).