Patent ID: 7065988
Filing Date: 2006-06-27
Classification: D04B

Abstract:
1. A device for varying stitch tightness for circular knitting machines with a cam box, a needle holder, needle pushers, needles, comprising: a knockover cam that is supported by a portion of the cam box, which faces the needle holder of the machine, said knockover cam having a profile that is inclined with respect to a direction of motion of said needle holder relative to said cam box and being engageable by a heel of the needles or of needle pushers that protrudes from said needle holder toward said cam box; said needle holder having, on a face thereof that faces said cam box, a plurality of slots that run substantially at right angles to said direction of motion, each slot accommodating a needle that is slideable along a corresponding slot thereof; said profile of the knockover cam being adapted to produce a movement of the needles, along the corresponding slot of the needle holder, after the needles have engaged a thread at a feed of the machine, in order to form new loops of knitting; a slider that is supported so as to be slideable along an adjustment direction with at least one component perpendicular to said direction of motion, said knockover cam being mounted on said slider; adjustment means connected to said cam box and connected to said slider for movement along said adjustment direction, wherein said adjustment means comprises an actuator connected to an adjustment cam and actuatable so as to turn said adjustment cam about an axis thereof through preset angles, said adjustment cam having a single external active profile, and wherein two cam followers are arranged on said slider so to make contact with said active profile in two spaced points thereof, and to cooperate in determining a bilateral coupling with said adjustment cam, wherein said contact points are arranged at opposite sides with respect to an imaginary plane that passes through the rotation axis of the adjustment cam and is perpendicular to said adjustment direction.