Device for making a cladded yarn, the device being suitable for use on a ring spinning frame and comprising: - a first creel foreseen to hold at least one bobbin of roving; - a second creel foreseen to hold at least one bobbin of cladding yarn; - a drafting unit comprising a plurality of rollers (3,4,5,6) through which the fibers of the roving pass, - a draft control device suitable to adjust the draft of the cladding yarn before entering the spinning process; - an injector configured such that when the device is attached to a ring spinning frame the injector is arranged in the region of a spinning triangle of a related spindle of the ring spinning frame for introducing the cladding yarn to the spinning process such that it will be cladded around a yarn spun out of the roving in the region of the spinning triangle where the fibers exiting from the drafting unit are spun into a yarn, - wherein at least a part of the injector responsible to deliver the cladding yarn to the cladding process of its related spindle is arranged movable in an oscillating manner with respect to the drafting unit, in a direction parallel to the direction of the axes of the drafting rollers (3, 4, 5, 6) corresponding to the directior of the ring spinning frame, when the device is attached to a ring spinning frame, and synchronized with a travelling of the roving exiting the drafting unit, - wherein the injector comprises a first bail and a second bail for delivering the cladding yarn, said first bail and second bail being arranged at a distance with respect to each other and mounted on a holder adjustable with respect to the position where the cladding yarn is introduced in the spinning process, the injector being adjustable with respect to at least two rotation axes which are parallel to the direction of the axes of the drafting rollers (3, 4, 5, 6) corresponding to the direction of the ring spinning frame, when the device is attached to a ring spinning frame, and which are distanced with respect to each other, and - wherein the adjustable holder is itself mounted on an arm arranged swiveling with respect to a mount interconnected to an oscillating fastening bar oscillating in the direction parallel to the direction of the ring spinning frame. - a first creel foreseen to hold at least one bobbin of roving; - a second creel foreseen to hold at least one bobbin of cladding yarn; - a drafting unit comprising a plurality of rollers (3,4,5,6) through which the fibers of the roving pass, - a draft control device suitable to adjust the draft of the cladding yarn before entering the spinning process; - an injector configured such that when the device is attached to a ring spinning frame the injector is arranged in the region of a spinning triangle of a related spindle of the ring spinning frame for introducing the cladding yarn to the spinning process such that it will be cladded around a yarn spun out of the roving in the region of the spinning triangle where the fibers exiting from the drafting unit are spun into a yarn, - wherein at least a part of the injector responsible to deliver the cladding yarn to the cladding process of its related spindle is arranged movable in an oscillating manner with respect to the drafting unit, in a direction parallel to the direction of the axes of the drafting rollers (3, 4, 5, 6) corresponding to the directior of the ring spinning frame, when the device is attached to a ring spinning frame, and synchronized with a travelling of the roving exiting the drafting unit, - wherein the injector comprises a first bail and a second bail for delivering the cladding yarn, said first bail and second bail being arranged at a distance with respect to each other and mounted on a holder adjustable with respect to the position where the cladding yarn is introduced in the spinning process, the injector being adjustable with respect to at least two rotation axes which are parallel to the direction of the axes of the drafting rollers (3, 4, 5, 6) corresponding to the direction of the ring spinning frame, when the device is attached to a ring spinning frame, and which are distanced with respect to each other, and - wherein the adjustable holder is itself mounted on an arm arranged swiveling with respect to a mount interconnected to an oscillating fastening bar oscillating in the direction parallel to the direction of the ring spinning frame.