JP2005512920A - Method and apparatus for joining a plurality of yarns, particularly yarn ends - Google Patents

Abstract

A method for connecting at least two threads, especially thread end regions, which are arranged overlapping and are connected together, wherein an auxiliary connection element is guided several times around the adjacent threads, the connection element remaining on the threads.

Description

Detailed Description of the Invention

  The invention relates in particular to a method for joining the ends of at least two yarns which are provided with overlapping yarn end ranges and are subsequently joined together.

  In the field of textile technology, the problem often arises that two yarns must be joined together at their ends. The yarn thus extended seeks to be as close as possible to a single piece of yarn of the same length, regardless of where it is joined. This is especially true with regard to the strength and thickness of the extended yarn. The problem of forming such a thread joint is made more difficult by having to join the threads of the entire thread layer with the threads of another thread layer. Yarn binding must be performed at a specific speed under conditions that permit industrial use.

  The individual yarns of a layer are often very close together, so that little space is available to handle the yarns and form individual bonds. This situation exists when, for example, the end of the warp layer as used in a loom is joined with the start of a new warp layer. In order to join the individual yarns of both yarn layers together, each two yarn ends are joined together by a knot, as is conventional. However, yarn knot machines provided for mechanical knot formation are relatively expensive and require complex mechanical structures. Furthermore, the knot is generally much thicker than the sum of the diameters of both yarns. This can be a problem during subsequent processing of the yarn, for example, when passing the combined yarn through a heel element. Finally, some yarns tend to break when subjected to a strong mechanical load, as in the case of knot formation. Such yarns can hardly be connected to each other by a yarn knotting machine.

  From EP-A-0 998 218, another method of forming the joint is known. Here, it is proposed that both yarn ends are first placed side by side, clamped and then wound together in a spiral. The last measure is implemented by means of a sleeve or by two rollers that each rotate and additionally move along the yarn. Due to friction, both yarn ends are wound together. Subsequently, a liquid adhesive is applied to the yarn end thus prepared, and the yarn end is fixed at the above-described position by this adhesive. However, this method has the disadvantage that the yarn ends are very strongly mechanically loaded. This is particularly a problem with yarns composed of a plurality of fibers. The same is true for yarns that tend to break. Furthermore, the strength of the joint is greatly influenced by the adhesive strength of the adhesive. Finally, the bonding of one whole yarn layer and the yarns of the other yarn layers takes a very long time, and there is a possibility that the machine parts become dirty due to the application of the adhesive.

  It is also known to join two yarn ends by twisting using an air vortex. In this case, the fiber composite of the yarn is loosened in the yarn end region, and the fibers at both yarn ends are bonded to each other by the spiral. However, this method has the disadvantage that only yarns configured as multifilaments can be bonded to each other. Such a method can be seen, for example, from German Offenlegungsschrift 28 10 741.

  Finally, from German Patent No. 2942385, by taking one or more fibers from one of the two yarns each configured as a fiber composite and winding it around both yarns A method for joining these two yarns is known. Therefore, this method can also be used only for multi-fiber yarns. Furthermore, this method has the disadvantage that the fibers must be separated from the composite over time. Furthermore, both fiber composite materials have a significant effect on the bond strength.

  The problem underlying the present invention is therefore the possibility of mechanical coupling of yarns, in particular the ends of the yarns, where only a large tensile load can be applied, but only a mechanical load is applied to the yarns in the coupling range as much as possible. Is to give. Furthermore, the joining range has a thickness as small as possible, so that the possibility of good subsequent processing of the joined yarns is ensured. The method according to the invention is to be as versatile as possible, i.e. suitable for the binding of yarns configured as monofilaments, multifilaments or fiber composites. Finally, the yarns are joined in a time that allows the economical use of the method and apparatus for forming the joints.

  According to a first aspect of the invention in the first type of method, the coupling aid is circulated a plurality of times around the yarn end region that contacts each other, and the auxiliary means remains on the yarn end region. The problem is solved.

  According to the second aspect of the present invention, the holding device that holds the overlapping yarns in the end range and the coupling device that couples the yarn end ranges provided in the holding device have a plurality of auxiliary means. The problem is also solved by a device that allows circulation around the spinning end area.

  The auxiliary means is preferably supplied to the yarn in a gas or air stream. In this case, the same air flow or one or more other air flows are used to wrap the auxiliary means around the yarns to be joined. The air flow provides the auxiliary means with at least a substantially predetermined direction of movement which causes the auxiliary means to be moved around the yarn. This may be done by one or more air vortices that transition or are directed around the yarn end.

  The use of a gas flow or air flow has the advantage that no moving parts are required for supplying auxiliary means and for forming the windings. The device for this can have one or more air vortex chambers, in which one joint can be formed on the same thread as much as possible in the air vortex chamber. Such an embodiment is particularly cheap because of the small number of members, especially a small number of non-movable members, and is reliable for preventing loss of function.

  A preferred embodiment of the device according to the invention has a supply means by which the auxiliary means takes at least one component extending transversely to the direction of the thread to be joined during its supply movement. An effective configuration of such a supply unit has a yarn injection nozzle, and the auxiliary unit is supplied to the yarn using only the compressed air by the yarn injection nozzle. It is further advantageous if the auxiliary means takes a movement component which extends parallel to the direction taken by the yarns to be joined in the range of the joining points. These motion components can be applied to the auxiliary means already at the time of its supply or only in the original winding process in which the auxiliary means is guided around the yarn. As much air flow as possible is used for the winding process and is moved spirally around the yarn due to the geometry of the air vortex and the direction of introduction of the air flow into the air vortex chamber.

  In another useful configuration, the device has at least two chambers and air vortices that are independent of each other flow in these chambers. Both chambers are provided in close proximity to each other and are isolated from each other by isolating means. It has been found advantageous if the chamber air vortices are directed in opposite directions. This can be done with a suitably oriented inlet passage for compressed air. In this case, the longitudinal motion components in the rotation direction of the air vortex and the direction parallel to the yarn may be opposite to each other.

  Therefore, the idea of providing the end of one yarn and the start of the other yarn on the opposite side is the basis of the present invention. In this case, both overlapping yarn end ranges are pulled as lightly as possible and are oriented substantially linearly and parallel to each other. Around these overlapping areas, auxiliary means that can be wound, extend in the longitudinal direction and bendable as much as possible are circulated several times, for example as a thread. In order to be able to influence the properties of the joint, the auxiliary means are not an essential component of the yarn to be joined. The auxiliary means may therefore differ from the yarn in terms of its material. According to the invention, the auxiliary means is supplied to the yarn and subsequently circulated around this yarn.

  Circulation around the common perimeter of both yarn end ranges can be done in different ways. Due to the relatively simple method, it is preferable to cycle the auxiliary means in the form of multiple turns. This plurality of turns produces a winding, which can also have turns having the same and opposite rotational directions and a plurality of winding layers provided above and below. Therefore, the result of the tour according to the invention of the auxiliary means cannot be interpreted as only a formation made of yarn and having a specific number of helical turns. If the auxiliary means is in a state of transition to a solid state or a liquid agglomerated state as much as possible, the auxiliary means is handled particularly easily during the tour.

  In order for the finished joint to be tensioned, the yarn can be subjected to at least a small tensile load during the formation of the joint. Despite the simple handling of the auxiliary means during the formation of the joint, the high load potential is increased after or before the winding process, and this tensile load remains permanently on the auxiliary means. Time is gained advantageously. In particular, for this reason, yarns that shrink under certain influences, such as heat or coldness, are suitable as auxiliary means. An example of a yarn having such characteristics is a yarn having at least a polyamide component.

  The elasticity of the auxiliary means can also be used to form the coupling part. In this case, auxiliary means for receiving a relatively large tensile stress can be provided around both yarns, but at least spaced from these yarns. For this reason, the auxiliary means is provided on the spacing piece. When the spacing piece is then removed, the auxiliary means reaches the yarn due to the tensile stress and its elasticity and compresses the yarn. In this case, part of the tensile stress may be lost again, so an auxiliary means, for example an elastic yarn with a suitably large elastic elongation, is provided on the spacing piece. For example, a thread having the name Lycra (Trademark of DuPont, Geneva, Switzerland) or Dorlastan (Trademark of Bayer AG, Reefelkusen, Germany) can be used as such a binding aid.

  The tensile load of the auxiliary means compresses the wound yarn end. This compressive force exerted on the yarn end is one of the effective relationships responsible for the tensile loadability of the joint according to the invention. Therefore, an increase in the tensile load of the auxiliary means appears with an increase in the tensile load possibility of the joint. At the same time, the yarn end is also more strongly compressed by the larger tensile load of the auxiliary means, thereby reducing the thickness of the completed joint. In addition, with the higher tensile load of the auxiliary means, the auxiliary means is pushed into the yarn end area, which can additionally cause a meshing connection between the auxiliary means and both yarn end areas. The frictional coupling of both yarns to be joined can also contribute to the strength of the joint.

  In order to further increase the loadability of the joint, an advantageous embodiment can additionally be provided with an adhesive. This adhesive has the purpose of first strengthening the joint between the auxiliary means and the yarn end area.

  In a preferred embodiment, the adhesive may already be included in the auxiliary means itself. This first particularly preferred example is a so-called composite melt-bonded yarn. Such a thread has two components. One component is a fine chemical fiber yarn, while the other component can be a melt adhesive that produces adhesive properties upon heating. Particular preference is given to composite melt-bonded yarns based on polyamide. In this yarn, heating does not only melt the adhesive components and then bond the yarns together. Almost simultaneously with the melting process, the polyamide component also shrinks, thereby creating a tensile force on the yarn and a compressive force on the yarn. On the one hand, the shrinkage causes a frictional bond, and on the other hand, the adhesive causes an adhesive bond and / or a substance bond. Therefore, at least one of the heating processes can be advantageously used in many respects. Such adhesive joints can be permanently tensioned, thus increasing the possibility of tensile loading of the joint by winding.

  Another example of forming an adhesive bond is that the auxiliary means is coated or impregnated with an adhesive during delivery to the yarn end. The adhering action of the auxiliary means to the yarn end can occur.

  Other preferred configurations of the invention can be seen from the claims.

  The invention is explained in detail by means of the embodiment schematically shown in the drawing.

  FIG. 1 shows a highly schematic representation of the end of a warp layer 1 that is partly shown for use in a loom. The warp 2 is fastened to the frame 3. In order to avoid the need to redraw a wrinkle element (not shown) that is drawn onto the warp 2, one end 4 of each of the new warp layers 5 at the end of the yarn 2 at the end of the warp layer. To be combined.

  The device according to the invention shown in FIGS. 2 to 8 is provided for forming such a thread joint. According to the highly schematic illustration of FIG. 2, this device has an air vortex device 6, and a composite melt-bonded yarn 8 that is pulled out of a bobbin 7 and used as a coupling aid is passed through a yarn injection nozzle 9. be introduced. In the illustrated embodiment, a composite melt-bonded yarn is used which is provided by the Swiss company Ems-Chemie AG under the name GRILONC-85 (having a yarn thickness of 2000 dtex). The composite melt bond yarn 8 is used to join each one yarn 2 of the yarn layer 1 with the yarn 4 (not shown in FIG. 2) of the new yarn layer 5. For this purpose, both yarns are provided in the air vortex device 6 where the yarn 8 is wound, which will be explained in more detail below. The yarn injection nozzle 9 can use the yarn storage unit 14 by the clamp 10 and the drawing device 11 provided between the yarn injection nozzle 9 and the bobbin 7. The clamp 10 can also be used to limit the yarn length that enters the air vortex device 6. The thread 8 of the coupling portion is separated from the bobbin 7 by a cutting device 15 provided after the nozzle 9 in the entry direction.

  According to FIGS. 3 and 4, the air vortex device 6 comprises an upper half 16 and a lower half 17. Each of these halves 16, 17 has a substantially semi-cylindrical recess 18, 19. The radii and lengths of the semicylindrical recesses 18 and 19 are the same. A partition wall 20 is provided in each of the semi-cylindrical recesses 18 and 19 approximately in the middle of the length range. In the figure, only the partition 20 of the lower half 17 is recognized among both partitions. The partition wall 20 is oriented perpendicular to the length range of the semi-cylindrical recesses 18 and 19. The recesses 18 and 19 are tapered at their open ends in a conical shape toward a substantially circular opening.

  In another embodiment, the air vortex device may consist of one part. In this case, in the length direction of the cylindrical air vortex device, a slit that allows insertion of a thread from one side is formed in the cylindrical wall.

  On the wall of the lower half 17 there is one through hole 55, 56 (FIGS. 4 and 4a) on each side of the partition wall 20, respectively. Each of the holes 55, 56 passes through the wall of the half 17. Both holes 55, 56 lead to this recess in a direction substantially tangential to the section screen of the recess 19 having a semicircular cross section. The holes 55 and 56 are used for introducing compressed air not shown in detail, and air vortices are generated on each side of the partition wall 20 by the introduction of the compressed air. Both compressed air vortices move from the partition into the open sides of both chambers 23, 24 in a substantially spiral manner due to the pressure drop. Since both holes 55, 56 lead to their respective chambers on different sides with respect to the longitudinal direction of both chambers 23, 24, both compressed air vortices have opposite rotational directions.

  In the lower half 17, the wall 20 is provided with two grooves 25 that form an angle with respect to each flat wall 20, for example, about 0 ° to 15 °, and are aligned with each other (FIG. 4). Thus, one groove 25 is on one side of the partition wall 20 in one chamber 23, and the other groove 26 is on the other side of the partition wall 20 in the other chamber 24.

  The yarn injection nozzle 9 shown in detail in FIGS. 6 and 7 is connected to the groove 26. As the yarn injection nozzle, for example, the one provided by the Dutch company Te Stroke Wearing Technology Dirim can be used. Such a yarn injection nozzle 9 has a housing 30, and an elongated hollow needle body 32 is attached to the tip of the housing. There is a nozzle body 31 behind the hollow needle body 32 in the housing. The conical portion 33 of the nozzle body 31 forms a gap 35 together with the funnel-shaped inlet 34 of the hollow needle body. The size of the gap can be changed by moving the nozzle body 31 in the axial direction. Thereby, the acceleration of air flowing into the gap 35 through the hole 36 of the housing and flowing out through the nozzle tip 38 can be changed. For purposes described in more detail below, a thread (not shown in the figure) introduced through a recess 37 extending in the axial direction of the nozzle body 31 is entrained by the resulting suction action and is shown by the arrow 39 Can be accelerated by the nozzle tip 38 and the hollow needle 32. Such a yarn injection nozzle 9 is known as a weft insertion nozzle for a loom, for example.

  Both halves 16, 17 of the air vortex chamber are separable from one another in order to introduce the yarns to be joined. In the embodiment shown in FIGS. 3 and 4, the upper half 16 can thus be transferred to upper and lower end positions via movement means (not shown). At the upper end position, both halves are spaced from each other, through which two thread ends can be introduced between the halves without problems. This allows both yarns to be joined to be introduced into the vortex chamber parallel to each other and then the half 16 is moved to the initial position.

  As can be seen in particular in FIG. 3, both chamber halves of each chamber can be shifted slightly from one another. This prevents the air flow to be generated from hitting the vertical edges of both halves when circulating in the air vortex device. The slits 27, 28 required for the introduction of both yarns can advantageously be closed prior to the formation of the joint, so that the air vortex can flow in the air vortex device as unobstructed as possible. In the first embodiment, not shown, both halves touch each other at the lower end position and are thus swung away so that one of the halves 16, 17 separates for the introduction and withdrawal of the yarn, or the longitudinal axis On the other hand, it can be moved at a right angle. In another embodiment shown in FIG. 5, the closing element 29 can be pushed into the slits 27, 28. It is advantageous if the air vortex chamber is provided with a slit only on one side so that the closing element provided on the chamber wall need only be provided on one side.

  In order to be able to introduce two aligned yarns into such an air vortex chamber 23a provided with a slit on one side, a holding device 14a can be provided as shown in FIG. This has two warp thread holders 48a and 49a which are movable at right angles to the thread surface. Thus, both the warp yarn holding bodies 48a and 49a provided on one line together with the slit 27a of the air vortex chamber 23a can catch the respective yarns. Due to the movement of the warp holder, the yarn can be introduced through the slit 27a into the air vortex chamber between both warp holders and held there. In order to lead out the yarn, the warp yarn holders 48a, 49a must be lowered again. The yarn follows the movement of the warp holder due to its elastic stress. In order to protect the joint, the vortex air can be blocked when exiting the vortex chamber.

  In order to introduce and withdraw the yarn end between the halves of FIGS. 3, 4 and 4a, a holding-swing device 45 is provided as schematically shown in FIG. 8 in connection with the heating device 46 according to the invention. The purpose of this heating device can be further described below. The holding-swinging device 45 has two swinging levers 48 and 49 attached to a common swinging shaft 47, and the free ends 48 a and 49 a of these swinging levers are for both yarn end portions 50 and 51. It is configured as a tightening holding piece. Between at least both of the clamping holding pieces, both threads are in contact with each other side by side in their end regions. By means of the rocking movement of the rocking levers 48, 49, both tightened yarns can be introduced between both halves 16, 17 (FIGS. 3 and 4) and can then be led out again.

  The holding-swinging device 45 can also be used to introduce the continuously tightened yarn end into the infrared heating device 46 shown in FIG. Such a heating device can have an elliptical reflecting wall 52. The reflecting wall 52 has a length at least corresponding to the length of the winding 53 to be formed each time in the direction in which the yarns 50 and 51 extend. A rod-shaped infrared heating source 54 is provided at the focal point of the ellipse. The tightened yarn ends 50, 51 can be swung to another focal point and remain there for a certain residence time for heating. This is shown in broken lines in FIG. In order to introduce the yarn end portions 50 and 51, the reflection wall 52 can have a notch having a shape matched to the conveyance path of the yarn end portion.

  In order to join the two yarn ends 50, 51 together, each yarn is first introduced into both clamping holding pieces and secured thereto. Handling devices for the insertion of yarn under tension are known to the person skilled in the art from the field of textile technology, in particular yarn knotting machines. The holding-swing device 45 then swings both threads between both halves 16, 17 and then the upper half is lowered to the operating position. In this case, the yarn is provided between the halves 16 and 17 substantially along its common cylindrical axis.

  Thereafter, compressed air can be introduced through the through holes 55 and 56 (FIGS. 4 and 4a) leading to the respective chambers 23 and 24 in the range of the partition wall 20 and the yarn injection nozzle 9. As a result, air vortices are generated in both chambers 23, 24, which flow in a spiral manner toward the open ends of the respective chambers. Further, the composite melt bonded yarn 8 (FIG. 2) is sucked through the yarn injection nozzle 9, accelerated at the nozzle, and injected into both grooves 25 and 26 (FIGS. 3 and 4). The first part of the yarn 8 that is injected into both grooves, and therefore the tip in the injection direction, is in one chamber 23 and the remaining part of the yarn 8 is in the other chamber 24. The yarn tip is then trapped by an air vortex in chamber 23, which rotates the tip around both yarn ends in the vortex. As a result, starting from the septum 20, the thread wraps around both threads 50, 51 spirally towards the open end of the chamber 23. In this case, due to the centrifugal force and acceleration of the yarn 8 toward the chamber end, the rotating portion of the yarn is subjected to tensile stress. Thereby, the yarn presses the yarn end portions of both of the gaps of the winding motion against each other.

  The ends of the melt-bonded yarn 8 used for winding can be fixed in a different manner in principle to the yarn ends to be joined. When hot air is used for the air vortex, the ends of the composite melt bonded yarn 8 are already sufficiently melted at the end of the winding process and can produce a sufficient adhesive action for fixing. Similarly, a small nozzle is provided at the chamber end, and high temperature air can be directed only to the yarn end by this nozzle. Finally, in another possible embodiment, hot air can be directed along both yarns 50, 51. This air can bring the entire yarn as well as the yarn end to the temperature required for the adhesive action to occur very quickly.

  The other end of the yarn can already be released during the winding movement of the yarn 8 in one chamber. This captures the other half of the yarn by the air vortex in the other chamber 24. The air vortex is a longitudinally moving portion that extends in a direction opposite to the air vortex in the first chamber 23 and parallel to the yarn in a direction opposite to the air vortex, and spirals around both yarns. Rotate to. Thereby, in the second chamber 24, the other end portion of the yarn is wound around the yarn end portion in the rotational direction of the air vortex in this chamber. This partial winding likewise starts in the region of the septum 20 and moves spirally towards the open end of this second chamber 24. Due to the reverse rotation direction and longitudinal movement direction of the partial windings, as shown in FIG. As shown in FIG. 9, the formation of the windings in the double chamber of FIG. 3 allows the yarn windings at both winding ends to have a smaller pitch in the range of windings 53. On the other hand, when forming a winding in a single chamber, only the last formed winding can have a small pitch (FIG. 10).

  It is conceivable that different pitches result due to the different yarn lengths and possibly different flow rates of the air vortices during the formation of each partial winding. This can result in forces that act differently on the yarn in terms of size and direction. This can result in different slopes of individual turns and different magnitudes of tensile stress in the yarn. From this it can be deduced that the geometry of the air vortex chamber, which influences the flow velocity of the air vortex, also influences the shape of the winding.

  Subsequently, the already coupled yarn can now be led out of the air vortex laterally by the holding-swing device 45 so that it is not necessary to forcibly shut off the air vortex. In some cases, the upper half 16 is first moved to the upper end position before the yarns 50 and 51 wound with the yarn 8 are taken out.

  If it is still necessary to heat the melt bonded yarn 8, the yarn can be introduced into another infrared heating device 46 shown in FIGS. The yarns 50 and 51 are provided at the first elliptical focal point 71 therein, and the infrared heating source 54 provided at the other elliptical focal point 69 is energized. The direct infrared ray 70 and the infrared ray 72 reflected from the reflecting wall 52 to the elliptical focal point 71 perform heat concentration over the entire length of the winding in the range of the winding end portions 50 and 51, and the composite molten adhesive yarn 8 is caused by this heat concentration. And melted to a sufficient extent for the formation of an adhesive bond. Of course, the melt adhesive of the composite melt bond yarn can be melted in other ways as well. In principle, all forms of contact and convection heat are suitable, for example hot air guided over the windings in the length direction of the yarns 50, 51.

  12a and 12b, one or more carrier yarns 74, usually made of polyamide, of the composite melt bonded yarn 8 shrink by the action of heat, thereby effecting a frictional connection between the yarn ends 50, 51 and the yarn 8. . The melted adhesive enters the threads 50 and 51 at least on the surface from one or more melt-bonded threads 73 of the thread 8 without losing the shape of the winding. In this case, the composite melt bonded yarn 8 is coupled to both yarn end portions 50 and 51. This can also be called a material bond between the yarn 8 and the yarns 50 and 51. As a result, the yarn 8 is also fixed to the yarns 50 and 51, and the possibility of a tensile load on the joint portion is increased by the solidification of the yarn 8. Already when the yarn 8 is brought to the melting temperature, the yarn ends 50, 51 can be led out of the heating device. The solidification process can be performed outside the heating device or terminated.

  As a result, a joint is formed between the two yarn end ranges. Subsequently, another thread of one thread layer (eg warp thread layer) can be combined in the same way as a thread of another (warp) thread layer. If this process is carried out very quickly and in connection with the yarn group, the joints can also be cooled after the heating process. Thereby, the mutual adhesion of the coupling portion can be prevented.

  In another preferred embodiment, other vortex techniques can be considered to form a winding around the yarn end. For example, FIG. 13 shows two halves 76, 77 that can be assembled by a tenon 78 and a hole 79 in the vent vortex. A central recess 80 is provided between both halves 76, 77. Both threads 50 and 51 not shown in FIG. 13 are passed through the recess 80. In each half, a ventilation shaft 81 that spirally spirals along the recess 80 is formed in the ventilation shaft vortex around the recess 80. Therefore, the air vent 81 has a shape similar to a spiral staircase. However, unlike this, the radius of the vent has decreased from one end of the recess to the other. In this regard, the radius means the direction in which the ventilation shaft extends in the direction intersecting the longitudinal axis 82 of the recess.

  At the end portion where the ventilation shaft 81 has the maximum radius, the composite melt-bonded yarn can be inserted into the ventilation shaft 81, and compressed air can be introduced. Compressed air can be introduced into the air vent 81 from a supply section 88 shown only schematically in FIG. Compressed air flowing through the vent shaft entrains the composite melt bonded yarn 8, whereby the yarn in the vent shaft 81 moves toward the other end of the vent shaft and wraps around both yarn ends 50, 51. FIG. 14 shows this in a highly schematic manner, where the four instantaneous positions 83, 84, 85, 86 of the yarn indicated by the yarn end correspond to four different instantaneous shots of the same yarn during the winding process. ing. In the instantaneous photographing of the yarn 5, the yarn end portion at the completion of winding is indicated by a position 87.

  In another possible embodiment based on vortex technology, the outlet openings 91 can be provided in tubules 90 which are arranged in a star shape relative to one another. FIG. 16 shows such a device. 50, 51 to be coupled to each other are passed through the device at the center of the star. The supplied compressed air flows through all outlet openings 91 so that the outflowing air has a tangential component.

  The air vortex generated thereby moves spirally around the yarn end portions 50 and 51. The portion of the yarn 8 starting from the yarn end portions 50 and 51 and extending so as to cross these yarn end portions is entrained by the air vortex and is wound around the yarn end portion due to the air flow.

  In another embodiment, a mechanical winding device 93 shown in FIG. 17 can be provided to form the winding. This device has, for example, a disk-shaped rotating body 94 formed with slits along a radial line. The rotating body 94 can be rotatably provided in the bearing portion by a rotating hollow shaft (not shown), for example. A rotating body 94 is provided with a freely rotatable bobbin 95, and a thread, for example, a composite molten adhesive thread 8 is wound around the bobbin. The thread ends 50 and 51 to be joined are passed through the slit 96 and the hollow shaft. The rotating body 94 is further movable in the length direction of the yarn end portion in order to form a spiral winding of the yarn 8.

  In order to couple both yarn ends together, the end of the yarn 8 is provided at the yarn end 50, 51. Subsequently, the rotating body 94 is converted from a rotational motion into a translational motion by a driving means (not shown). As a result, the yarn 8 is unwound from the bobbin 95 rotating around the yarn end portion, and wound around the yarn end portion in a spiral manner by a number of windings. Similarly, a tensile stress can be set on the yarn 8 by a bobbin brake (not shown). After the yarn 8 is wound to a predetermined length at the yarn end, the yarn 8 at the yarn end can be cut from the bobbin 95.

  Two yarn layers to be bonded together are shown.   Fig. 2 shows an apparatus according to the invention for forming a yarn coupling.   The air vortex device according to the invention is shown in one end position.   The air vortex device according to the invention is shown in another terminal position.   Fig. 5 shows the air vortex device of Figs. 3 and 4 in plan view.   Fig. 2 shows a front view of the air vortex device shown in a highly schematic manner.   The yarn injection nozzle is shown in a perspective view.   Sectional drawing of the yarn injection nozzle which follows the VI-VI line of FIG. 6 is shown.   1 shows a heating device according to the invention with holding-swing devices shown in three different positions.   1 shows a first embodiment of a coupling part according to the invention;   2 shows a second embodiment of a coupling part according to the invention.   The operation principle of the heating device according to the present invention will be described.   A portion of the composite melt bonded yarn is shown in a greatly enlarged plan view.   The cross section of a composite fusion bond yarn is shown.   2 shows in perspective view two halves of a vent vortex according to the invention.   FIG. 14 shows a plurality of instantaneous radiographs during the formation of a joint in the vent vortex body of FIG.   3 shows another embodiment of an air vortex chamber with a holding device for warp yarns.   Figure 3 shows another apparatus according to the invention for forming a joint.   1 shows a mechanical winding device according to the invention for forming a joint.

Claims (32)

  In a method of joining at least two yarns, which are provided in layers and are joined together, in particular the yarn end, the joining auxiliary means is circulated several times around the yarn in contact with each other, and the auxiliary means stays on the yarn ,Method.   2. A method as claimed in claim 1, characterized in that the binding aid is subjected to tensile stresses while being circulated around the yarn.   3. A method according to one or more of the preceding claims, characterized in that the yarn is substantially straightened while the auxiliary means is circulated around the yarn.   A method according to one of the preceding claims, characterized in that the auxiliary means are wound around the yarn in the form of a winding.   A method according to one of the preceding claims, characterized in that a melt-bonded yarn or a composite melt-bonded yarn is circulated around the yarn as much as possible.   A method according to one of the preceding claims, characterized in that an additional substance is applied to the thread to form a substance bond, in particular an adhesive bond.   7. A method according to claim 6, characterized in that an adhesive is applied to the yarn as an additional substance.   7. A method according to claim 6, characterized in that the yarn is wound with auxiliary means comprising an additional substance.   9. A method according to claim 7 or 8, characterized in that the auxiliary means is warmed during and / or after the winding of the yarn to form a joint.   A method according to one of the preceding claims, characterized in that the auxiliary means are wound around the yarn with as much air as possible.   11. A method according to claim 10, characterized in that the yarn is provided in at least one chamber of the air vortex device and auxiliary means are then introduced into the at least one chamber of the air vortex device as much as possible.   12. A method according to claim 11, characterized in that the auxiliary means during the introduction has a direction of movement having a component extending tangentially to the length range of the yarn.   13. A method according to claim 11 or 12, characterized in that the auxiliary means are introduced into the chamber of the air vortex device by the air flow generated by the yarn injection nozzle.   14. Method according to one of claims 10 to 13, characterized in that the auxiliary means are trapped by flowing air, in particular air vortices, and circulated around the yarn.   15. Method according to one of claims 10 to 14, characterized in that the auxiliary means are wound in two different directions.   The first partial length of the auxiliary means is introduced into the first chamber of the air vortex device and is wound around the yarn in the first winding direction by the first air vortex, and the second partial length of the auxiliary means Is introduced into the second chamber and is wound around the yarn in a second winding direction opposite to the first winding direction by a second air vortex. the method of.   A method of combining the yarns of the first warp layer with the yarns of the second warp layer, wherein each one of the first warp layers is provided so as to overlap with one yarn of the second warp layer. 17 wherein at least one thread of the first warp layer is combined with at least one thread of each of the second warp layers by the method according to one of claims 1-16, Method.   A device for connecting at least two yarn ends, having a holding device for holding overlapping ends and a connecting device for connecting yarns provided in the holding device to each other. A device, characterized in that the helical winding of the coupling aid can be formed around the yarn.   19. A device according to claim 18, characterized in that the auxiliary means can be circulated around the yarn a plurality of times by means of a coupling device.   The coupling device has means for forming an air vortex that flows around the yarn end region, whereby the auxiliary means can be circulated around the yarn provided in the holding device, Item 20. The apparatus according to Item 18 or 19.   An air vortex device has a yarn end region provided in at least one chamber, and compressed air can be introduced through the introducing means in the one end region of the chamber. 21. The apparatus of claim 20, further comprising means for flowing as an air vortex around the other end region of the chamber and introducing auxiliary means into the chamber and the air vortex.   The device according to claim 21, characterized in that the air vortex device has two chambers, and compressed air forming the air vortex can be introduced into each of both chambers.   Device according to claim 22, characterized in that the introduction means in both chambers can generate air vortices that flow in different directions of rotation around the yarn ends.   24. The apparatus according to claim 21, wherein the means for introducing the auxiliary means has a yarn injection nozzle.   25. Method according to one of claims 18 to 24, characterized in that it has a heating device and the auxiliary means provided on the yarn end area can be heated by this heating device.   26. A device for joining a yarn of a first yarn layer with a yarn of a second yarn layer, characterized in that it comprises a device according to one of claims 18-25.   A mechanically formed joining portion of at least two yarns, wherein the joining portion is in the yarn end region where the yarns overlap, and the yarn end region can extend in the longitudinal direction and bend without load A coupling part, characterized in that it is surrounded by auxiliary means that are capable of receiving tensile stresses in the coupling part.   28. Coupling according to claim 27, characterized in that it is wound around a yarn end area.   29. The coupling part according to claim 27 or 28, characterized in that the auxiliary means and the yarn end region are materially coupled.   30. The coupling part according to claim 27, wherein the auxiliary means is a thread.   28. A joint according to claim 27, characterized in that the yarn is a melt-bonded yarn.   Use of a melt-bonded yarn, characterized in that the melt-bonded yarn forms at least two yarn joints in the yarn end region.

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