Knitting machines

Claim 1

In a circular knitting machine provided with knitting needles having butts guided by a cam system controlling the speed and direction of movement of said needles, a cam comprising an edge profile having a face formed by a series of continuous curves connecting a plurality of points, each related to the moving of the needles during knitting operation, said plurality of points representing respectively a first position relative to the impact of said butts on said cam, a second position relative to the initiation of the closing of the needle hooks, a third position relative to the termination of the hook closing, a fourth position relative to the formation of the loop, a fifth position relative to the finishing of the loop, a sixth position relative to the finishing of the kinking and a seventh position relative to the reversal of motion of the butts, said first and second, second and third, third and fourth, and fourth and fifth pairs of points, respectively, being connected by a fourth degree curve, a tangent to The said continuous curves occuring at each of said plurality of points, said tangent occuring at each of said points forms an angle with a line parallel to the theoretical plane of said cam, the angle corresponding to the first point being between 15* to 25*, the angle at the second point being between 43* to 53*, the angle at the third point being between 20* to 30*, the angle at the fourth point being between 48* to 56*, the angle at the fifth point being between 15* to 25*, the angle at the sixth point being between 0* to 8*, and the angle at the seventh point being between 28* to 38*, said points generating a condition of zero acceleration of the motion of said needles at at least the second, third and fourth positions.