Needle actuation device for knitting machines

摘要

A needle actuation device for knitting machines, comprising a cam supporting surface which faces a needle supporting element and supports at least one casting-off cam which has a profile arranged at an angle to the direction in which the needle supporting element moves with respect to the cam supporting surface during the operation of the machine. The profile of the casting-off cam can be engaged by a heel of the needles, or of needle pusher elements, which protrudes from the needle supporting element toward the cam supporting surface. The casting-off cam is supported by the cam supporting surface so that it can rotate about a first axis which is substantially perpendicular to the surface of the portion of the needle supporting element that faces in each instance the cam supporting surface and can rotate on command about the first axis in order to vary the inclination of its profile with respect to the direction of motion.