JP5039051B2 - Thread guide - Google Patents

Description

  The present invention relates to a yarn guide described as a superordinate concept of claim 1.

  According to the specification of WO0024663, a thread guide having a finger shape described as a superordinate concept of claim 1 is known. The yarn guide has, at its free end, a yarn guide fork for receiving the yarn to be wound around the bobbin. The thread guide fork is constituted by a longitudinal slit extending towards the thread guide end coupled to the drive. In order to make the yarn guide lightweight, the yarn guide is generally thin. In order to reduce the friction generated between the yarn and the yarn guide, does the yarn guide have a roundness formed in the region of the yarn guide fork by machining the legs of the yarn guide fork later? Or it has an interrupted edge. Furthermore, an appropriate coating is required on the surface of the yarn guide fork. For this purpose, the coating material must have a high friction resistance as well as a low friction surface.

  The known art has the disadvantage that the legs of the thread guide fork have to be post-processed in order to avoid wear on the thread guide or the thread to be guided. In addition, there is a drawback that wring occurs when the yarn is pulled out from the cup, and the yarn guide is plastically deformed when caught by the leg portion of the yarn guide fork.

  Accordingly, an object of the present invention is to provide a yarn guide having high strength and wear resistance.

  This problem has been solved by the features of claim 1.

  According to the first aspect of the present invention, the yarn guide has, at its free end, two yarn guide elements configured as hollow bodies, and the yarn guide element constitutes a yarn guide fork. A yarn guide element constructed in this way has several advantages. The yarn guide element configured as a hollow body has high strength and at the same time has good elastic deformation characteristics. The outer shape of the hollow body of the yarn guide element contributes to the reduction of wear. This is because the shape reduces the working surface for the yarn to be wound around the bobbin at high speed. Furthermore, the guide element is lighter than the legs of a known guide fork that is machined from the solid. This reduces the inertial force acting more strongly on the free end of the yarn guide than on the opposite end of the yarn guide, based on the long lever arm. This is particularly useful for drive design.

In particular, the thread guide element can be configured in a substantially hollow cylindrical shape. As an alternative, the thread guide element may be tapered towards one end. In this case, the thread guide element can be frustoconical, for example. This has the advantage that the area of the thread guide fork is rounded or interrupted, and the thread guide element does not have to be processed later as in the prior art in order to reduce the friction generated. Have Another advantage is that the construction thus has a high resistance to the wrinkles that occur when the yarn is drawn from the cup.

  Advantageously, the yarn guiding element can have a circular cross section. In this case, the wear action of the yarn on the yarn guide can be further reduced. Furthermore, it is possible to avoid the occurrence of sharp edges in the yarn guide element that contacts the yarn or to avoid post-processing of the yarn guide element.

  Furthermore, the yarn guiding element can consist of a metal or an alloy, in particular a high grade steel or a titanium alloy. Such materials have a slight weight and high strength. This additionally contributes to weight reduction and positively affects the inertial mass of the yarn guide. The yarn guide element made of such a material has very high wear resistance. Also, yarn guide elements made from high grade steel or titanium have a very high surface quality, thereby eliminating the need for a coating to reduce the friction between the yarn guide element and the yarn. The high strength and high elastic modulus of the yarn guide element contribute to the yarn guide element having a higher resistance to the occurrence of wrinkles.

  In particular, the thread guide element can be coupled to the thread guide by a press fit. This makes it possible to dispense with an additional fixing member which additionally increases the weight of the yarn guide in the region of the yarn guide element. For this purpose, the thread guide element can have a slight excess dimension, and the guide element can be force-coupled to the thread guide by press fitting.

  As an alternative, the thread guide element can be connected to the thread guide by gluing. In this case, the increase in the weight of the yarn guide due to the use of the adhesive is so small that it does not become a problem.

  Furthermore, the thread guide element can be provided with a rod therein at least partially filling each thread guide element. The at least partial filling of the thread guide element configured as a hollow body increases the bending stiffness of the thread guide element in the receiving area of the thread guide fork, which is exposed to the maximum load during winding of the thread.

For this purpose, the rod is made of a lightweight and high-strength material. The rod can be made of, for example, carbon or a material having properties equivalent to carbon . Carbon rods have very high strength and elasticity but are also light in weight, so that an increase in the weight of the yarn guide in the region of the yarn guide element is negligible. Fixing the rod to the thread guide element is preferably done by gluing.

  Furthermore, the thread guide elements have different lengths. This simplifies passing the yarn through the yarn guide.

Advantageously the yarn guide is tapered towards the free end. This also contributes to reducing the mass inertia force of the yarn guide, whereby the inertia force generated at the reversal point is reduced when the yarn guide is braked and accelerated.

  Hereinafter, details of the present invention will be described based on the illustrated embodiments.

FIG. 1 shows a schematic side view of a yarn guide 1 according to the invention. The yarn guide 1 is tapered towards its free end. The wide end portion of the yarn guide 1 is coupled to a single motor type driving device 3. In order to wind the yarn around the bobbin 4 driven via the drive roller 2, the yarn guide 1 is alternately turned left and right by the drive device 3.

The yarn guide 1 has a yarn guide fork 5 at a narrow free end. The yarn guide fork 5 is constituted by hollow yarn guide elements 6 and 7. In this embodiment, the yarn guide elements 6 and 7 configured as hollow bodies are formed in a hollow cylindrical shape. Selectively yarn guide elements 6 and 7 is tapered toward one end. For this purpose, the thread guide elements 6, 7 can be configured, for example, in the shape of a truncated cone. The yarn to be wound around the bobbin is guided in accordance with the movement of the yarn guide 1 between the yarn guide elements 6 and 7.

  The hollow cylindrical thread guide elements 6, 7 preferably have a cylindrical cross section as shown in FIG. Due to the circular shape of the thread guide elements 6, 7, the wear action of the thread passing through the thread guide 1 at a very high speed on the thread guide elements 6, 7 is reduced. For example, high-grade steel or titanium alloy can be used to manufacture the yarn guide elements 6,7. These materials have high strength and surface quality. Furthermore, the material has the possibility of good elastic deformation based on its high elastic modulus.

  Fixing the yarn guide elements 6 and 7 to the yarn guide 1 is performed by transmission coupling. In this case, the thread guide elements 6, 7 have a slight excess dimension, and the thread guide elements 6, 7 are joined to the thread guide 1 in the form of a press fit. As an alternative, the thread guide elements 6, 7 can also be joined to the thread guide 1 with an adhesive. This also provides a lightweight connection form.

  In order to increase the bending stiffness of the yarn guide elements 6, 7 in the receiving area of the yarn guide fork 5, the yarn guide elements 6, 7 are made of, for example, carbon or the like, as shown in FIG. It is reinforced by inserting rods 8, 9 adapted to the shape of the guide elements 6, 7. In this case, the rods 8, 9 extend at least partly over the length of the thread guide elements 6, 7. The rods 8 and 9 are fixed by bonding.

  FIG. 3 shows the arrangement of the rods 8 and 9. The rods 8 and 9 are partly located at the ends of the thread guide elements 6 and 7 fixed to the thread guide 1. The region of the yarn guide fork 5 is exposed to a large mechanical load by the yarn that is to be wound around the bobbin at high speed. The load is compensated by the insertion of the rods 8,9. Based on the low weight of the material used for the rods 8, 9, the rods 8, 9 can also completely fill the thread guide elements 6, 7.

Schematic of the yarn guide of the present invention. FIG. 2 is a detailed view of the yarn guide fork of FIG. 1. FIG. 2 is a detailed view of the yarn guide element shown in FIG. 1 with a rod inserted into the yarn guide element.

Explanation of symbols

  1 thread guide, 2 drive roller, 3 drive device, 4 bobbin, 5 thread guide fork, 6, 7 thread guide element, 8, 9 rod

Claims (10)

A thread guide (1) for guiding a thread in a thread guide fork (5) parallel to the bobbin axis in order to supply the thread onto the rotating bobbin (4), the thread guide (1) being finger And is connected to the driving device (3) on the end side,
Two guide elements (6, 7) configured as hollow bodies are arranged at the free end of the yarn guide (1), and the guide elements (6, 7) constitute a yarn guide fork (5). A yarn guide characterized by that.   2. The yarn guide according to claim 1, wherein the guide element (6, 7) is substantially hollow cylindrical.   2. The yarn guide according to claim 1, wherein the guide element (6, 7) tapers towards one end.   4. The yarn guide according to claim 1, wherein the guide element (6, 7) has a cylindrical cross section.   The yarn guide according to any one of the preceding claims, wherein the guide element (6, 7) is made of metal, alloy or composite material.   The yarn guide according to any one of claims 1 to 5, wherein the guide element (6, 7) is joined to the yarn guide (1) by a coupling by shape.   The yarn guide according to any one of the preceding claims, wherein the guide element (6, 7) is joined to the yarn guide (1) by bonding. The guide element (6, 7) comprises a rod (8, 9) therein, the rod (8, 9) at least partially filling the guide element (6, 7). A yarn guide according to any one of claims 1 to 7. It said guide elements (6, 7) has a different length, the yarn guide according to any one of claims 1 to 8. Yarn guide (1) is tapered towards the free end, the thread guide according to any one of claims 1 to 9.

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