Process for spinning and/or twisting yarns, machine for spinning and/or twisting yarns and method to transform a machine for spinning and/or twisting yarns

Abstract

A process is provided of yarn spinning and/or twisting, in which a yarn runs between a yarn feeder towards a yarn picker. A driver rotates the yarn picker at a predetermined speed, in which a stretch of balloon is generated in a point located between the yarn feeder and the yarn picker by the presence of a ring. A helical path with oscillating spiral diameters exists between the yarn feeder and the yarn picker, so that the path of the yarn through the ring, creates a body of revolution from a diameter generating a balloon that has at least a hyperboloid structure forming at least two stretches of balloons consecutive to each other. A machine for performing the process is also provided.

Claims

1. A process for yarn spinning and/or twisting, in which a yarn runs between a yarn feeder towards a yarn picker, and comprising: a cursor located between at least one of the yarn picker or yarn feeder and a yarn guide, the picker being connected to a driver to rotate the yarn picker at a predetermined speed, in which a stretch of balloon is generated in a point located between the yarn feeder and the yarn picker because of the presence of a yarn twister comprising a ring having a diameter (DB) interactive with the cursor, wherein a value of the tension produced by the cursor is lower than in existing spinning and/or twisting processes for the same type of yarn and wherein a value of the rotation speed of the yarn twister and height of stretches of balloon (LB) is such that the yarn follows along a helical path with oscillating spire diameters (S) along a distance existing between the yarn guide and the cursor, such that the yarn, by operating the yarn twister, has a diameter generating two consecutive hyperboloid structures (E) forming a plurality of stretches of balloon (B) consecutive to each other that maintain an unchanged height throughout the process without recourse to apparatus elements in the yarn travel along the helical path between the cursor and the yarn guide.

2. The process of yarn spinning and/or twisting according to the claim 1, wherein the yarn has 2 to 20 hyperboloid structures (E).

3. The process of yarn spinning and/or twisting according to claim 1, wherein the height of the stretches of balloon (LB) is at least two times the diameter of the stretch of balloon (DB).

4. The process for yarn spinning and/or twisting according to the claim 3, wherein the height of the stretches of balloon (LB) ranges from 5 to 50 times the diameter of the stretch of balloon (DB).

5. The process for yarn spinning and/or twisting according to the claim 4, wherein the height of the stretches of balloon (LB) ranges from 5 to 25 times the diameter of the stretch of balloon (DB).

6. The process of yarn spinning and/or twisting according to claim 1, wherein the yarn picker is a winding bobbin (2).

7. The process of yarn spinning and/or twisting according to claim 1, wherein the yarn feeder is a supplying bobbin.

8. The process for yarn spinning and/or twisting according to claim 1, wherein the cursor is coupled to a bobbin rail connected to the yarn picker.

Description

SHORT DESCRIPTION OF THE DRAWINGS

(1) FIG. 1. Is a schematized view of a first embodiment of a continuous ring spinner that uses the method according to this invention that includes a detailed view of the cursor;

(2) FIG. 2. Is a schematized view of a second embodiment of a ring twister machine that uses the method of the invention that includes a detailed view of the cursor;

(3) FIG. 3. Is a schematized view of a third embodiment of another ring twister machine that uses the method of the invention that includes a detailed view of the cursor;

(4) FIG. 4. Is a schematized view of a fourth embodiment a double twist twister that uses the method of the invention;

(5) FIG. 5. Is a schematized view of a fifth embodiment of a vertical cabling machine that uses the method of the invention;

(6) FIG. 6. Is a schematized view of the geometrical shape the yarn adopts during the twisting process according to this invention;

(7) FIG. 7. Is a schematized view of a path a yarn can take in a process according to this invention; and

(8) FIG. 8. Is a schematized view showing a machine that uses means for stretching the yarn combined with a guiding means.

(9) FIG. 9. Is a schematized view showing a ring twister without guiding means.

(10) FIG. 10. Is a schematized view showing a machine that uses yarn-stretching means without a guiding means.

(11) FIG. 11. Is a schematized view of a ring twister that uses a roller as guiding means;

DESCRIPTION OF A PREFERRED EMBODIMENT

(12) In view of the mentioned figures and in accordance with the numbering adopted, an example of preferred embodiment can be seen, that includes the parts and elements indicated and described in detail below.

(13) In all the preferred embodiments of the spinning and twisting machine described below, the value of the rotation speed of the winding bobbin is such that an helical path is generated, with an oscillating spire diameter (S), (see FIG. 7) along the distance (LB) existing between the feeding means and the winding bobbin such that a body of revolution is created that has two consecutive hyperboloid structures (E) forming a plurality of stretches of balloon (B) consecutive to each other.

(14) Another feature of the invention is, as it is shown in the FIG. 1, a ring spinner having on the top a yarn feeding system, indicated generally with reference (1) that is of a conventional type therefore it shall not be described in more details, while at the bottom a bobbin (2) is provided for picking the yarn (3) that rotates motor-driven by conventional driving means (4) shown schematized. The yarn (3) that is wound in the bobbin enters perpendicularly with respect to the bobbin side wall as the yarn is made to pass by a tension element named cursor (5) placed in a bobbin rail (6) that picks the yarn that has been twisted and stores it in the bobbin (2). The said cursor (5) is best apparent in the enlarged detail included in the FIG. 1.

(15) During the yarn winding process (3) in the embodiments shown herein, three stretches of balloon (B) are formed (the number of stretches of balloon being not limitative) between a yarn guiding means (8) (indicated schematized), as for example, a small-diameter ring and an area generating a stretch of balloon provoked by twisting means 100 so that a stretch generating diameter (DB) is generated of the structure with multiple stretches of balloon of yarn, in which are defined two strangling of hyperboloid stretches (E) that allow to reduce the level of tension of the yarn. An essential characteristic of the machine is the nonexistence of elements limiting the balloon. It shall be understood by limiting the balloon any element that makes contact with the yarn in the stretch where the balloons are generated.

(16) It shall be mentioned that the distance (LB) existing between the guiding means and the area generating the stretch of balloon is at least two times the diameter generating the balloon (DB), so that at least two stretches of balloon are generated between the guiding means and the area generating a stretch of balloon.

(17) It has to be said that the number of stretches of balloon (B) can be increased or reduced (the minimum being two stretches of balloon) by increasing or reducing the distance (LB) existing between the yarn guiding element and the element responsible of provoking the twisting, in this case represented, the cursor (5).

(18) In a preferred embodiment, the height of the stretches of balloon is ranging from 5 to 50 times the diameter generating the stretch of balloon.

(19) In an even more preferred embodiment, the height of the stretches of balloon is ranging from 5 to 25 times the diameter generating the stretch of balloon.

(20) In a non-limitative example of embodiment, with a generating diameter (DB) of 36 mm eight hyperboloid structures can be obtained (i.e., nine stretches of balloon) with a height of stretch of balloon equivalent to 50 times the generating diameter of 36 mm for a yarn with a 30 Nm titer.

(21) By “titer” is meant the relation existing between the weigh and the length of a yarn, the former being a fixed value and the later a variable value.

(22) The FIG. 2 shows a ring twister with a yarn feeding roller from a static creel in which the same common elements have the same numeral references, the feeding means being generally indicated with the reference (1), arranged on the top and the yarn picking (3) bobbin (2) at the bottom of the machine.

(23) The FIG. 3 shows a ring twister, which is especially suitable for processing fiberglass, in which the same common elements have the same numeral references the feeding means (1) being arranged on the top and the yarn picker (3) proximal to the bobbin (2) at the bottom of the machine, therefore the direction of the yarn is downwards, as in the embodiments of machines shown in the FIGS. 1 and 2.

(24) The FIG. 4 shows a double twisting twister in which the same common elements have the same numeral references.

(25) The FIG. 5 shows a vertical cabling machine with two yarns in which the same common elements have the same numeral references, in which the direction of the operation is upwards the same as the machine shown in the FIG. 4 and indicated by means of the arrow (f), i.e., the picking bobbin is arranged on the top while at the bottom there is the means feeding a first and second yarns that are interlocked to each other. In this machine, the yarn (3) and the additional yarn (H2) are joined, in which the additional yarn (H2) is supplied by a feeder (7).

(26) The FIGS. 6 to 8, show a geometrical profile that the yarn adopts during the twisting process, in which three stretches of balloon (FIG. 6) are formed as well as the actual path a yarn can carry out during the process of handling a yarn.

(27) In a preferred embodiment, the yarn spinning and/or twisting machine is comprised of, means to increase or reduce the height of the stretch of balloon (LB) (no shown). This characteristic facilitates the access to the yarn feeding means (1) or to the yarn picking means (2) that during the operation of the machine are not easily accessible for the user as they are in a too high position. Thus, the means to increase or reduce the height of the stretch of balloon (LB) allow, when it is necessary, for example to replace a bobbin, reduce the height of the stretch of balloon in order that the user have an easy access to the yarn feeding means (1) or to the yarn picking means (2). After replacing the bobbin, the means to increase or reduce the height of the stretch of balloon (LB) allows that, the yarn feeding means (1) or the yarn picking means (2) come back to their operating position.

(28) In a preferred embodiment, the guiding means (8) for guiding the yarn (3) move in height associated to the movement in height of the bobbin rail (6) and cursor (5). The movement in height of the bobbin rail (6) and cursor (5) facilitates picking the yarn in the yarn picking means handled (3), such as a bobbin (2), that remains fixed in height. The movement of the guiding means (8) associated to the movement in height of the bobbin rail (6) and cursor (5) allows that the height of the stretches of balloon (LB) remains unchanged avoiding thus variations of the shape of the balloons. Optionally the yarn feeding means (1) move in height jointly with the guiding means (8)

(29) In a preferred embodiment (FIG. 9) the yarn feeding means (1) or the yarn picking means is located so that the exit of the yarn of the yarn feeding means (1) or the entrance of the yarn of the yarn picking means (2) is located approximately on the vertical axis (V) of the stretch of balloon.

(30) In a preferred embodiment of the guiding means (8) for guiding the yarn (3), especially when it is a delicate yarn, is a roller (9) (FIG. 11). Optionally the roller (9) can have a forced rotatory movement associated to the rotatory movement of the yarn feeding means (1) in order to reduce the friction of the yarn that is generated when the yarn makes contract with the roller (9).

(31) In a preferred embodiment, the yarn feeding means (1) is comprised of yarn stretching means (FIGS. 8 and 10). Optionally the direction followed by the yarn within the yarn stretching means is at an angle ranging from −20° to +20° with relation to the vertical (V). In an even more preferred embodiment, the direction followed by the yarn within the yarn stretching means is coincident with the vertical (V). In any of the said cases, guiding means (FIG. 10) can be not required.

(32) A third feature of the invention is a method to transform a yarn spinning and/or twisting machine characterized in that it includes a step in which the height of stretch of the balloon (LB) is increased so that, by operating the twisting means 100 a body of revolution is created from a diameter generating a balloon that has at least a hyperboloid structure (E) forming at least two stretches of balloon (B) consecutive to each other.

(33) The increase of the stretch of balloon (LB) is achieved by lifting the yarn feeding means (1) and/or the yarn guiding means (8) with respect to the yarn picking means (2), or by lifting the yarn picking means (2) with respect to the yarn feeding means (1).

(34) The details, shapes, sizes and the rest of accessory elements, used in the production of the method of the invention can be conveniently replaced by others that do not depart from the scope defined by the claims attached below.