EP0018926B1 - Double-twist yarn twisting device - Google Patents

Description

The present invention relates to an improved device for twisting a wire by double twisting, a device commonly designated by the expression "double twist pin", an expression which will be adopted in the following description.

Furthermore, in the following description, the invention will be described for a double twist spindle arranged vertically, but it is obvious that it also relates to spindles of the same type arranged either horizontally or at an angle.

• - un arbre vertical, entraîné en rotation par exemple par un système tangentiel à courroie, et maintenu sur le bâti du métier par l'intermédiaire d'une crapaudine,
• - un porte enroulement monté libre en rotation à l'extrémité dudit arbre et maintenu fixe par rapport à celui-ci, par exemple à l'aide de moyens d'immobilisation magnétique, ledit porte enroulement étant destiné à recevoir la bobine de fil à tordre et étant constitué essentiellement :
  • d'un axe creux co-axial à l'axe de la bobine et de l'arbre rotatif,
  • d'une embase et éventuellement d'un pot de protection emmanché sur ladite embase,
• - un organe de renvoi rotatif solidaire de l'arbre tournant, disposé en dessous du porte enroulement et présentant un canal pour le passage du fil.

In general, double twist spindles essentially include:

• - a vertical shaft, driven in rotation for example by a tangential belt system, and held on the frame of the loom by means of a clamp,
• - A winding door mounted free to rotate at the end of said shaft and kept fixed relative thereto, for example using magnetic immobilization means, said winding door being intended to receive the spool of twist yarn and being essentially constituted:
  • a hollow axis co-axial with the axis of the coil and the rotary shaft,
  • a base and possibly a protective pot fitted on said base,
• - a rotary return member secured to the rotating shaft, arranged below the winding door and having a channel for the passage of the wire.

The wire of the winding, taken in the parade, forms a reeling balloon and is engaged from top to bottom in the fixed hollow axis, passes through the channel of the rotating return member, then into a centering barbin- balloon stop, arranged in the extension of the axis of the spindle, the wire forming the balloon between the peripheral surface of the rotating return member and said barbin and then being returned in a conventional manner.

Double twist pins have been known for a long time and have been the subject of numerous publications, in particular in documents FR-A-878 641, FR-A-885 434, FR-E-57 274/955 185 (second addition to document FR -A-955 185), in documents GB-A-618 028 and GB-A-989608, as well as in documents US-A-2 207 574 and US-A-3 640 060.

Furthermore, in document FR-A-1 597 961 (corresponding to document US-A-3 685 269), it has been proposed, in particular in order to reduce the tensions to which the wire is subjected, to use as a rotary member returns a conical bowl, surrounding the winding over part of its height, the wire resting on the surface of said conical bowl substantially in a helical path before forming the balloon proper.

Such a device has numerous advantages and in particular makes it possible to increase the speed of rotation of the spindle for an equivalent tension given to the wire or, to treat fragile wires having to be subjected to low tensions at equal speed. Furthermore, such a device makes it possible to significantly reduce the height of the balloon and consequently the size of the installation.

However, we have found, and this is what is the subject of the present invention, an improved device which, while retaining the advantages of the conical bowl spindle of the aforementioned type, results in a much lower energy consumption. , a more regular scrolling of the thread, makes it possible to process a wider range of thread titles while maintaining a minimum tension of the threads during the treatments.

• - un arbre entraîné en rotation, supporté par l'une de ses extrémités sur le bâti du métier,
• - un porte enroulement monté libre en rotation à l'autre extrémité de l'arbre et maintenu fixe par rapport au bâti du métier par exemple à l'aide de moyens d'immobilisation magnétique et comportant essentiellement :
  • un axe creux co-axial avec l'axe de la bobine,
  • une embase et éventuellement un pot de protection emmanché sur ladite embase,
• - un organe magasin de renvoi, solidaire de l'arbre rotatif et constitué essentiellement par un bol creux entourant le porte enroulement fixe sur une partie de sa hauteur et comportant un canal pour le passage du fil, ledit fil s'appuyant suivant un trajet sensiblement hélicoïdal contre la surface dudit bol avant de former le ballon proprement dit, l'extérieur dudit bol se présente sous la forme d'un volume de révolution évasé vers le porte-enroulement et dont l'axe est confondu avec l'axe de la broche et il se caractérise en ce que ledit volume de révolution comporte une première partie, au voisinage de l'orifice de sortie du fil, ayant la forme d'un cône de faible angle au sommet et s'étendant sur une longueur comprise entre le tiers et la moitié de la hauteur dudit bol, cette partie conique étant prolongée vers le porte-enroulement, par une partie évasée de génératrice courbe de forme concave.

In general, the invention therefore relates to a double twist spindle consisting of:

• - a shaft driven in rotation, supported by one of its ends on the frame of the loom,
• a winding door mounted free to rotate at the other end of the shaft and kept fixed relative to the frame of the loom for example using magnetic immobilization means and essentially comprising:
  • a hollow axis co-axial with the axis of the coil,
  • a base and possibly a protective pot fitted on said base,
• - a return store member, integral with the rotary shaft and essentially constituted by a hollow bowl surrounding the fixed winding door over part of its height and comprising a channel for the passage of the wire, said wire being supported along a path which is substantially helical against the surface of said bowl before forming the actual balloon, the outside of said bowl is in the form of a volume of revolution flared towards the winding holder and the axis of which coincides with the axis of the spindle and it is characterized in that said volume of revolution comprises a first part, in the vicinity of the wire outlet, having the shape of a cone of small angle at the top and extending over a length of between one third and half the height of said bowl, this conical part being extended towards the winding carrier, by a flared part of a curved generator of concave shape.

In other words, it can be said that the rotary hollow bowl according to the invention has substantially the shape of a trumpet horn, a megaphone, or the like.

Furthermore, the upper end of the hollow bowl according to the invention is advantageously curved inwards, which facilitates the release of the wire during the formation of the balloon.

In addition, the wire guide channel that the bowl has has a part arranged in the extension of the hollow axis of the winding door assembly and a part preferably arranged orthogonally to the previous one.

In this case, a deflection element, for example made of ceramic, is arranged in the elbow formed by the two parts of the wire guide channel.

• la figure 1 est une vue détaillée en coupe longitudinale d'une broche double torsion conforme à l'invention,
• la figure 2 est une vue schématique illustrant le fonctionnement d'une telle broche,
• la figure 3 est un diagramme montrant les courbes de consommation de puissance en fonction de la vitesse de rotation pour une broche réalisée conformément à l'invention (courbe I) et pour une broche similaire réalisée conformément au brevet français 1 597 961 (courbe II), c'est-à-dire dans laquelle le bol rotatif est de forme tronconique.

The present invention and the advantages which it brings will however be better understood thanks to the embodiment given below and illustrated by the appended diagrams in which:

• FIG. 1 is a detailed view in longitudinal section of a double twist spindle according to the invention,
• FIG. 2 is a schematic view illustrating the operation of such a spindle,
• FIG. 3 is a diagram showing the power consumption curves as a function of the speed of rotation for a spindle produced in accordance with the invention (curve I) and for a similar spindle produced in accordance with French patent 1,597,961 (curve II) , that is to say in which the rotary bowl is of frustoconical shape.

The double-twist spindle according to the invention comprises a rotary shaft 1 mounted on the frame 2 of the loom by means of an assembly forming a clamp 3. The rotation drive of this shaft 1 is obtained for example by a tangential belt 4. The other end of this shaft 1 is secured to a store return member 5, according to the invention, which is in the form of a volume of revolution whose axis coincides with the axis of the shaft 1, and which has a part 6 having the shape of a cone of slight slope, extended by a flared curved part 7 of concave shape. Preferably, the upper end 8 of this return magazine member is curved and curved inwards. A fixed winding door 9 is arranged inside the rotary return magazine member 5 described above. This winding door is mounted to rotate freely, by means of ball bearings 10-11, relative to the axis. 1 and consequently with respect to the rotary store return member. This winding holder 9 is immobilized by any known means, such as for example by magnetic means 21. This winding holder 9 essentially consists of a base 12 on which is fitted the end of the coil supporting the wire to be processed, coil 13 which is not shown in Figure 1 for simplification. It also includes a hollow axis 14, the upper part 15 of which serves to block the torsion imparted to the wire 16. The channel of the hollow axis 14 is arranged in the extension of the part 17 of the wire guide channel which comprises the store return member, this guide channel 17 being extended by a part 18 arranged orthogonally relative to it, a return element 19 being disposed at the elbow formed by these two channels 17 and 18.

The implementation of such a double twist spindle is done as follows. The wire 16 unwinding from its support 13 forms a first balloon A, passes inside the channel 14, then the conduits 17, 18. At the outlet of the conduit 18, it is directed towards the outside of the store member return 5 on which it describes several turns S to the point where it leaves the surface of said member to form the second balloon B before being brought into a guide barbin 20 and then be returned in a conventional manner.

Thus, for each revolution of the spindle, the wire first takes a first twist in its path from its unwinding point to the top 15 of the hollow axis 14, then a second twist in the outer balloon B between its exit of the store reference member and the guide barbin 20.

• - hauteur H : entre 80 et 160 mm,
• - longueur L de l'organe magasin de renvoi 5 : entre 40 et 80 mm,
• - diamètre extérieur D : entre 100 et 160 mm,
• - diamètre inférieur d : entre 30 et 80 mm, on a traité des bobines de fils synthétiques ou artificiels pesant entre 0,8 et 4 kg, ayant une longueur comprise entre 250 et 500 mm et un diamètre compris entre 70 et 150 mm.

As shown in the diagram illustrated in FIG. 3, such a device has, compared to the prior device described in document FR-A-1,597,961, the advantage of resulting in significantly lower power consumption, while allowing more regular scrolling of the thread, the processing of a wider range of thread count while retaining a minimum tension on the thread during the treatments. Curve 1 illustrates the consumption entailed by a double twist spindle equipped with a magazine return member according to the invention and curve II the same double twist spindle but equipped with a frustoconical magazine return member (shown in dotted lines) in Figure 1). Using such pins, having the following characteristics:

• - height H: between 80 and 160 mm,
• - length L of the return magazine member 5: between 40 and 80 mm,
• - outside diameter D: between 100 and 160 mm,
• - lower diameter d: between 30 and 80 mm, coils of synthetic or artificial son weighing between 0.8 and 4 kg have been treated, having a length between 250 and 500 mm and a diameter between 70 and 150 mm.

Curves I and II of FIG. 3 appended show that, at 6000 revolutions per minute, a spindle produced in accordance with the invention (curve I) consumes a power of approximately -13 watts, whereas with a store bowl tapered (curve II) the power consumption is about 15 watts. Furthermore, in both cases, the voltages communicated to the wires were identical.

It can be seen that, thanks to the invention, it is therefore possible, while greatly reducing the power consumed, to keep the advantages of the prior pins of the type described in document FR-A-1,597,961.

Claims (4)

1. Double twist spindle comprising :

- a shaft (1) driven in rotation, mounted by a first end on a machine frame (2),

- a package carrying assembly (9) rotatably mounted at the opposed end of the shaft (1) and maintained in an immobile condition with respect to the machine frame and which comprise essentially :

a hollow axle (14) coaxial with the axle of the bobbin,

a base (12) and eventually a protection bowl which is fitted on said base,

- a magazine element (5) fixely mounted on the rotatable shaft (1) and which comprise essentially a hollow bowl which extends around the package carrying assembly (9) along part of its height and which has a conduit (18) for the passage of the yarn (16), said yarn resting against the surface of the aforesaid bowl in a perceptibly helical fashion before forming the balloon proper, said bowl having an external shape under the form of a revolution volume diverging towards the package carrying assembly (9) and the axle of which being coaxial with the shaft of the spindle characterized by the fact that the revolution volume has, in the region of the yarn outlet, a first part (6) of conical shape with a gradual shape and extending over between one-third and one-half of the length of the hollow bowl, said conical part (6) being prolonged by a second part (7) having a concave bell-mouthed configuration.

2. Double twist spindle according to claim 1, characterized by the fact that the retaining means of the package carrying assembly (9) are magnetic means (21).

3. Double twist spindle according to any one of claims 1 and 2, characterized by the fact that the conduit for the passage of the yarn in the rotatable bowl comprises a part (17) which is coaxial with and in line with the hollow axle (14) of the package carrying assembly and a part (18) which extends transversely from the first of the two previous cited parts.

4. Double twist spindle according to claim 4, characterized by the fact that a diverting element (19) is positioned at the junction of the parts (17-18) of the conduit for the passage of the yarn.

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