Abstract: It is necessary for yarn which is wound into packages on supports or centers and is intended to be dyed, or at any rate subsequently employed for other uses, to be able to form, on an annular zone at the sides of the support a number of turns of "reserve" yarn available and intended for joining to the yarn of a subsequent package. In order to fasten the yarn end, a guide notch is formed in the edge of the annular zone and is combined with a portion of very little thickness which can be torn by the yarn which is inserted and forced into the notch such that it becomes wedged in the tear and is held therein. This anchoring device may be provided in either the base or the top of the center, or in both the base and the top of the center, in order to fasten both ends of the wound yarn.

Abstract: A dyeing cone (1) comprising a shell with apertures for the passage of the dyeing liquid, this shell defining an external surface (5) for the winding of the turns of yarn and an internal surface (7) for guiding along a bar of the dyeing machine; the internal surface consists of a first cylindrical portion (21) and of a second conical portion (23) whose smaller diameter is greater than the diameter of the cylindrical portion; ribs (31) projecting toward the axis of the cone extend on the conical portion (21), and constitute an extension of the cylindrical portion and in their lower part form a stop (31A) for a cone located below.

Abstract: One of the ends (X) of a tube has an internal annular ledge (7) and an annular wall (9), the internal surface (9A) of which forms an annular corner (10) around the ledge (7) and widens slightly as it moves away from the ledge; the other end (Y) forms a setback (12) towards the inside followed by an approximately cylindrical collar (14) for the turns of reserve yarn, the annular edge (14A) of which is capable of bearing against a ledge (7) as described above, of a similar tube and of being centered by an annular corner (10) as described above, of a similar tube; said annular edge (14A) has hollows (16) which are capable of allowing the passage of fluid which thus acts on the turns of the reserve.

Abstract: A bobbin for dyeing spools possesses an openwork wall on which is wound the yarn for forming the spool, and comprises a plurality of rings (3) which are mutually connected by a series of inclined bridges (5), of greater length than the interspace between contiguous rings (3) and are deformable under the action of the axial compression of the bobbin. The length of the bridges (5) is less than the interspace between two contiguous bridges (5) of a single series of bridges for connecting two consecutive rings (3).

Abstract: A cone for dyeing reeled yarns and for equivalent uses, with a truncated-cone wall pervious and having such a thickness so as to create, along a portion of its length, an axial through seat for the centering over the stems of the dyeing equipment and with an axial recess formed by the end part of the truncated-cone wall and an annular bottom, which axial recess is apt to receive the narrowest part of an axially adjacent cone, thereby the cones fitted onto the same stem penetrate partially one into the other.