GB2034762A - Guiding Yarn onto a Spool - Google Patents

Abstract

A device for the passage and the guiding of the yarn travelling towards the spool for textile spinning and twisting machines comprising a plurality of spindles, each mounted in the inside of a ring supported by a ring rail, is characterized by the fact that it comprises a rotating ring (6) so mounted on and supported by a respective coaxial ring 2 carried by the ring rail (1) so as to be able to freely rotate, through said rotating ring (6) an eyelet (7) being inserted extending upwardly beyond said rotating ring (7) and provided with an outer entrance passage for the insertion of the yarn (5), the end (7a) of said eyelet (7), which is positioned over said passage, being bent innerwardly so as to form a hook, while the other end (7b) which is positioned below said passage projects outwardly so as to form an arm of a length sufficient to be able to rest on the upper surface of the ring (2) fixed to the ring rail (1), said eyelet passing through a horizontal slot (8) arranged in the wall of the rotating ring (6) and so shaped and dimensioned as to allow said eyelet (7) to orient itself in different vertical planes in response of a traction effect produced by the bobbin (4) on the yarn (5). <IMAGE>

Description

SPECiFICATION A Device for the Passage and the Guiding of a Yarn Towards the Spool, for Textile Spinning and Twisting Machines The present invention relates to a device for the passage and the guiding of a yarn travelling towards the spool for textile spinning and twisting machines including a plurality of rotating spindles co-operating with a ring rail supporting a plurality of rings, said device comprising a rotating ring mounted coaxially to and supported in the inside of each ring of the ring rail, said rotating ring being freely rotating round a spool supported by a rotating spindle and is provided with an eyelet having an entrance passage for the yarn at its outer side, the end portion of said eyelet which is placed over said passage being bent innerwardly so as to form a hook in order to hold the yarn therein, while the lower end of said eyelet extends outwardly so as to be able to rest on the upper surface of the ring fixed to the ring rail, said eyelet passing through a horizontal slot arranged in said rotating ring, which slot is so shaped as to permit that said eyelet can orient itself only in substantially vertical planes.

Up to the date for performing the conventional ring spinning and twisting operations provision has been made that each spindle which carries a bobbin rotates within a ring carried by a ring rail which reciprocates up and down, the yarn being fed to the bobbin travelling through a traveller slidably mounted on said ring and which is dragged in rotation along said ring as a result of the spool rotation. Said traveller rotates at a speed which can attain a maximum of about 38 m/sec. Said value constitutes a technical limit in the performances of the ring spinning and twisting operations of the known types.For the purpose of increasing said limit, provision has been already made to substitute said conventional guiding traveller with a guiding device consisting in a rotating ring, coaxial to the spindle and freely rotatable in the inside of the conventional ring fixed on the ring rail, through said rotatable ring a radial hole being arranged for the passage and the guiding of the yarn which has to be wound on the bobbin. Said rotating ring is dragged in rotation by the yarn and owing to the very small pressure which said rotating ring creates on the fixed ring which supports said rotating ring with the interposition of sliding bearings or by pneumatic means. Said solution permits the peripheric speed to be increased so as to increase the preceding speed limit from 38 m/sec to about 60 m/sec.

This solution presents the inconvenience that as the yarn passes through the radial hole of the rotating ring it is subjected to a high friction effect, because said hole has a fixed radial orientation, while the diameter of each yarn turn changes; that causes the production of a yarn of low quality since it becomes hairy on account of the presence of broken and clotted fibres.On the contrary the present invention enables to obtain a yarn or a twisted thread of a quality equal to that which is at the present obtained by the use of the traveller systems, even if a rotating ring is used working at higher speeds, but when the hole acting yarn as guiding means and provided arranged in the known rotating ring is substituted with an eyelet which is always maintained in a substantially vertical plane and is inserted through said rotating ring and which is able to automatically orient itself in such a way as to maintain a constant exit angle of the yarn coming out of said eyelet provided for the passage and the guiding thereof.

These and other characteristics of the invention will be better understood from the following description of an embodiment of the invention, taking in consideration the accompanying drawing, in which: Figure 1 shows an axial sectional view of the device of the invention mounted on a ring rail, while the associated spool is shown in a side view; Figure 2 is a detail of Figure 1 in an enlarged scale; and Figure 3 is a top view of the assembly of Figure 1.

In the drawing the devices of the spinning and twisting machines have not shown, which are not pertinent to the device of this invention and which are also conventional.

In the drawing at 1 is indicated a ring rail on which is shown a ring 2 which is one of the plurality of rings carried by said ring rail 1. 3 is a tube round which will be wound the yarn 5 so as to form a bobbins 4.

In the inside of said ring 2 a coaxial ring 6 is suspended by means of a sliding bearing or a pneumatic supporting device which are well known in the art and which have been not shown.

Said rotating ring 6 carries an eyelet generally indicated 7, which serves for the passage and the guiding of the yarn 5 and which extend upwardly beyond the ring 6.

The yarn 5 coming out from a spinning or twisting unit, passes through said eyelet 7 and winds on the spool 2 which will be formed about the tube 3 mounted on a spindle (not shown) which is dragged in rotation by conventional means so that the rotation of the bobbin 4 through the eyelet 7 causes the rotation of the ring 6.

The eyelet 7 is inserted through a horizontal slot 8 arranged through the wall of the ring 6 so that said eyelet 7 can remain always substantially perpendicular to the ring rail plane (Figure 2) but it can freely take various orientations in substantially vertical planes so that it can automatically position itself in a vertical plane which comprises the tangent to the yarn turn, which is being to be formed at that point of which where said yarn begins to be wound round said bobbins 4.In particular in Figure 2 in full lines is shown the eyelet 7 in the position 7a, in which the yarn is being to form a turn of a minimum diameter, while in broken lines is shown the position 7b of the eyelet 7 when the yarn is being to be wound according to a turn of maximum diameter so as to better see the angular displacements which can perform the plane of the eyelet 7 of the device of the present invention, said angular displacements being essential in order to have the smallest and constant exit angle of the yarn 5 with respect to the plane of the eyelet 7 so as to prevent that the yarn 5 comes out with greater angles which can produce a strong friction of the yarn against the edge of the guiding means as, on the contrary, takes place with the use of the prior system providing a rotating ring having a radial guiding hole.Owing to the solution of the problem provided by the present invention a thread or twisted yarn having a uniform and even and non-hairy aspect will be obtained.

The eyelet 7 is so shaped as to permit an easy insertion of the yarn 5 therethrough and at the same time so as to prevent that the yarn can come out during the stopping of the machine, i.e.

when the traction applied to the yarn by the rotation of the spool 4 is interrupted.

For such a purpose said eyelet 7 has a ring-like shape having an entrance passage on its outer side. The upper end 7a of said eyelet 7 (Figure 2) is bent towards the inside so as to take the form of a hook capable of keeping back the yarn when the traction applied to it ceases. On the contrary, the lower end 7b of said eyelet 7, after its lower curved portion, is extended horizontally towards the outside and forms an arm 7b which is spaced apart from the end portion 7a of an extent sufficient for defining the passage for the insertion of the yarn 5 and which has also such a length so as to be able to rest on the upper surface of the ring 2.

The pressure applied by the arm 7b on the ring 2 increases as the centrifugal force increases so that the greater is the centrifugal force, the greater is the friction effect between the arm 7b and the stationary ring 2 and that serves to maintain duly the yarn 5 under a substantially constant tension because, as the speed increases, the friction also increases, but that depends also upon the weight of the eyelet 7. As a result thereof, if yarns of different deniers and resistance have to be worked, it is necessary to vary the weight of the eyelet 7. In addition in the event that bobbins of different maximum diameters have to be obtained, rings 6 of different sizes have to be used so that when the maximum diameter of the bobbins will be reduced, it is necessary to use a rotating ring 6 of an accordingly smaller diameter which will be supported by rotating ring 6 with the interposition of another ring of a diameter accordingly smaller; i.e. into the ring 2 must be inserted a reduction ring.

it is to be pointed out that the arm 7b may be vertically flattened so to transform it in a vertical fin which can act as an aerodynamic brake which imparts a tension to the yarn which is treated.

Claims (5)

Claims

1) A device for the passage and the guiding of the yarn travelling towards the spool for textile and twisting machines comprising a plurality of spindles, each mounted in the inside of a ring supported by a ring rail, characterized by the fact that it comprised a rotating ring (6) so mounted on and supported by a respective coaxial ring 2 carried by the ring rail (1) as to be able to freely rotate through said rotating ring (6) an eyelet (7) being inserted extending upwardly beyond said rotating ring (7) and provided with an outer entrance passage for the insertion of the yarn (5), the end (7a) of said eyelet (7), which is positioned over said passage, being bent innerwardly so as to form a hook, while the other end (7b) which is positioned below said passage projects outwardly so as to form an arm of a length sufficient to be able to rest on the upper surface of the ring (2) fixed to the ring rail (1), said eyelet passing through a horizontal slot (8) arranged in the wall of the rotating ring (6) and so shaped and dimensioned as to aliow that said eyelet (7) to orient itself in different vertical planes in response of a traction effect produced by the bobbin (4) on the yarn (5).

2) A device according to claim 1, wherein the end (7b) positioned below the entrance passage of the eyelet extends outwardly just after the lower curved portion of said eyelet (7).

3) A device according to claim 1, wherein the eyelet (7) has a weight of a value which depends upon the denier and the resistance of the yarn to be treated.

4) A device according to claim 1, wherein in the event that small bobbins have to be prepared, the rotating ring (6) has an accordingly smaller diameter and is mounted on the ring (2) fixed to the ring rail (1) with the interposition of a reduction ring.

5. A spinning device substantially as herein described with reference to the accompanying drawings.

5) A device according to claim 1, wherein the lower end (7b) of the eyelet (7) extending towards the outside is shaped in the form of a vertical wing adapted to act as a braking means owing to an aerodynamic effect.

6) A device as hereinbefore described and illustrated in the accompanying drawings.

New Claims or Amendments to Claims filed on 4th February 1 980 Superseded Claims 1-6 New or Amended Claims: 1. A device for guiding yarn towards a spool for use with textile spinning and twisting machines, the device comprising a fixed ring rail, a floating ring supported co-axially for rotation with respect to the fixed ring, and a yarn guide mounted on the floating ring; the yarn guide having a hook portion to receive yarn and having an end portion which passes through an aperture in the floating ring and which makes contact with the fixed ring rail, the yarn guide being pivotally supported in said aperture whereby, in use, the yarn guide is capable of self-orientation with respect to the diameter of turns wound on a spool located concentrically of the fixed ring rail and the floating ring.

2. A device according to claim 1 in which the end portion of the guide includes a curved section which passes through said aperture.

3. A device according to claim 1 or 2 wherein the yarn guide is one of a plurality of yarn guides of different weights, the yarn guide being selected with regard to the denier of the yarn which is used.

4. A device according to any one of the preceding claims including a reduction ring interposed between the floating ring and the fixed ring rail.