thread-forming elements

Abstract

To provide a yarn forming element that can be manufactured at a low cost, and has a particularly simple structure.SOLUTION: There is provided a yarn forming element 1 for an air spinning nozzle, comprising: a fine spinning cone 2 having a cone tip portion 3 forming a first end side 4 having an inlet opening 5; a passage forming body 6 forming a second end face side 7 having an outlet opening 8, in which the passage forming body and the fine spinning cone are connected to each other; and a through passage 9 passing through the passage forming body and the fine spinning cone to connect the inlet opening to the outlet opening, in which the fine spinning cone has a truncated conical partial segment 10, and the truncated conical partial segment is extended to form an intermediate chamber 13 by increasing a gap, in a direction of a second end face side, between its inner surface side 11 and the outer surface side 12 of the passage forming body radially defining the through passage.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a yarn forming element, an air spinning nozzle comprising such a yarn forming element, and a method for manufacturing such a yarn forming element.

[0002] Yarn forming elements for spinning devices, particularly for air spinning devices, are known in the prior art in a variety of configurations. The yarn forming element is used to generate a vortex air flow from the sliver that arrives from a drafting device and is controlled and supplied into the spinning nozzle provided with the yarn forming element, by the spinning compressed air supplied into the spinning nozzle to form an air spun yarn. This air spun yarn is led out from the spinning nozzle through the yarn forming element.

[0003] Yarn forming elements are known based on, for example, European Patent Application Publication No. 3293294, International Publication No. 2010 / 034416, and European Patent Application Publication No. 2573218. This known yarn forming element is formed from a plurality of assembled components. In this case, based on the fluid flow used for spinning, on the one hand, in order to spin the sliver with the spinning compressed air to form a yarn, and on the other hand, in order to lead out the air spun yarn, a particularly precise and tight connection must be made between the individual components, which results in a very expensive manufacturing process that requires a great deal of effort with extremely small tolerances.

[0004] In addition to the problem that the components must be particularly tightly joined, the prior art yarn forming elements have the drawback that the fibers inevitably catch on the separation points or joints of the individual components and are peeled off from the yarn at that time, thereby impairing the strength of the yarn. In addition, the peeled fibers accumulate at the separation points, and this accumulation also impairs the spinning result.

[0005] Therefore, the fundamental problem of the present invention is to provide a yarn-forming element that can be manufactured at least inexpensively and, in particular, is more simply constructed. More preferably, the yarn-forming element proposed by the present invention enables a spinning process with improved accuracy and efficiency, and it is desirable that contamination by detached fibers can be reduced in particular during the spinning operation and the spinning initiation process.

[0006] This problem is solved by the yarn-forming element described in claim 1, the air-spinning nozzle described in claim 12, and the method described in claim 13. Advantageous improved forms of the present invention are described in the dependent claims.

[0007] The yarn-forming element according to the present invention for an air spinning nozzle comprises a spinning cone having a conical tip that forms a first end face side having an inlet opening for receiving yarn. Furthermore, a passage-forming body is provided, having a second end face side having an outlet opening for leading the yarn out of the yarn-forming element. This passage-forming body and the spinning cone are connected to each other. The passage-forming body and the spinning cone are connected by a single through-pass to connect the inlet opening to the outlet opening for the purpose of conducting yarn. Therefore, the yarn received at the inlet opening can be guided through the through-pass to the outlet opening and led out of the yarn-forming element through this outlet opening.

[0008] The yarn-forming element is characterized in that the spinning cone has a frustoconical sub-segment, and this frustoconical sub-segment extends to form an intermediate chamber by increasing the distance between its inner surface and the outer surface of the passage-forming body that radially defines the through-path toward a second end face. This allows the yarn-forming element to be formed at least with less material, and consequently at a lower cost. The frustoconical sub-segment may preferably be positioned adjacent to the sub-segment that forms the tip of the cone, either directly or via at least one other intervening sub-segment. This makes it possible to form the conical region of the spinning cone according to requirements in a direction from the inlet opening to the outlet opening, taking into account the length of the fibers to be spun, for example, short fibers, intermediate fibers, or long fibers.

[0009] According to a preferred embodiment of the present invention, the spinning cone has a frustoconical segment that transitions into a cylindrical segment on the side opposite to the tip of the cone, and the inner surface of this cylindrical segment is spaced apart from the outer surface of the passage-forming body, extending the formed intermediate chamber. This allows the yarn-forming element to have a horizontal outer contact surface, also saving material, and through this contact surface, the yarn-forming element can be positioned appropriately and very accurately within the spinning nozzle with respect to the sliver supply section of the spinning nozzle that supplies sliver to the yarn-forming element.

[0010] Preferably, the intermediate chamber is formed to be accessible from or open to the direction extending from the outlet opening to the inlet opening. In other words, the end of the spinning cone facing the second end face is spaced apart from the outer surface of the passage-forming body, so that the outer intermediate chamber surrounded by the spinning cone can communicate with the periphery of the spinning cone. This allows a stabilizing element suitable for stabilizing the position of the yarn-forming element to be engaged within the intermediate chamber.

[0011] According to another preferred embodiment of the present invention, the passage-forming member extends beyond the spinning cone toward the second end face. Therefore, the passage-forming member has an extended length along the passage such that the second end face or exit opening protrudes at a predetermined distance from the end of the spinning cone directed toward the second end face or exit opening. This allows the terminal segment of the passage-forming member having the exit opening to be accommodated by a cover element that defines and tightly closes the spinning nozzle at the end, ensuring reliable delivery of the yarn from the spinning nozzle. With respect to its extended length, the passage-forming member may be formed aligned with the outer surface of the cover element, or, as required, spaced apart from the outer surface of the cover element.

[0012] Preferably, the cylindrical sub-segment has a first sub-segment and a second sub-segment, the outer diameter of the first sub-segment being different from the outer diameter of the second sub-segment. More preferably, the first sub-segment and the second sub-segment are joined to each other via a stepped increase in their outer diameters. In other words, the outer surfaces of the first and second sub-segments are stepped toward each other. This provides a stopper that acts along the passage for a mounting element acting on the outside of the yarn-forming element, thereby ensuring that the yarn-forming element is positioned in the penetrating direction inside the spinning nozzle.

[0013] Particularly preferable, the first sub-segment is positioned closer to the tip of the cone along the passage-forming body than the second sub-segment, and the outer diameter of the second sub-segment is larger than that of the first sub-segment. This provides a portion of the second sub-segment that extends radially beyond the first sub-segment, which provides the aforementioned stopper on the side of the second sub-segment facing the inlet opening and another stopper on the side of the second sub-segment facing the outlet opening. Through both of these stoppers, the second sub-segment and thus the yarn-forming element can be tightened or fixed in position using the tightening or mounting means of the spinning nozzle. This enables easy and reliable assembly of the yarn-forming element into the spinning nozzle.

[0014] According to another preferred embodiment of the present invention, the cylindrical partial segment has a first partial segment and a second partial segment, the inner diameter of the first partial segment being equal to the inner diameter of the second partial segment. The inner surface side of the cylindrical partial segment is formed at equal intervals with respect to the outer surface side of the passage-forming body over an extended length along the passage-forming body. This provides a deeper engagement with the engaging element of the spinning nozzle, thereby achieving more stable positioning of the yarn-forming element inside the spinning nozzle.

[0015] According to another preferred embodiment of the present invention, the thread-forming element has a three-part through-passage. Preferably, this through-passage has at least three segments, each having a different inner diameter, and each of two consecutive segments seamlessly transitions to one another with a transition region in between. Thus, the transition region connects segments of the through-passage that have a different diameter from the diameter of the segments continuing along the through-passage. Such a transition region facilitates fluid flow within the through-passage. Particularly preferably, the first through-segment leading to the inlet opening has the smallest inner diameter, and the third through-segment leading to the outlet opening has the largest inner diameter. The intervening second through-segment has an inner diameter larger than that of the first through-segment but smaller than that of the third through-segment. Thus, the through-passage expands in diameter from the inlet opening to the outlet opening. This ensures that, particularly when considering the spinning initiation process, in which the yarn must be introduced into the yarn-forming element, preferably through an outlet opening, the yarn can be reliably introduced and guided to the inlet opening and, through this inlet opening, into the vortex chamber of the spinning nozzle.

[0016] The thread-forming element may be made of any material, but according to a preferred embodiment, the thread-forming element is formed integrally from a single member. This makes it easy to form a particularly good guide for the fibers or threads and a surface that is particularly free of separations, connections, or seams. For example, the thread-forming element may be formed by an additive manufacturing method. This ensures that separations and connections are avoided. Possible additive manufacturing methods may be, for example, 3D printing, laser additive manufacturing (SLM), electron beam additive manufacturing (EBM), binder jetting (BJ), and / or fused deposition modeling (FDM). Additionally, subsequently, or alternatively, sintering of the workpiece may be performed, especially if it is desired to form the thread-forming element entirely from a ceramic material. Alternatively or additionally, stereolithography (SLA) may be used to form the thread-forming element from a ceramic material.

[0017] More preferably, in order to provide a particularly smooth, stable, and durable surface, the yarn-forming element may have a ceramic coating on at least all surface sections for fiber guidance. Particularly preferably, at least the outer surface side of the spinning cone and / or the inner surface side of the through-channel have a ceramic coating.

[0018] According to another preferred embodiment, the thread-forming element is formed rotationally and / or mirror-image symmetrically with respect to the central longitudinal axis of the through-passage. The latter configuration is particularly suitable when the passage-forming body cannot be formed rotationally symmetrically. The symmetrical configuration of the thread-forming element facilitates the manufacturing of the thread-forming element in any case.

[0019] According to another aspect of the present invention, an air spinning nozzle having the yarn-forming elements described above is proposed.

[0020] Further features and advantages of the present invention will become apparent from the following description of preferred embodiments, based on figures and drawings illustrating important details for the invention, and from the claims. Each of the features can be realized individually in one preferred embodiment of the invention, or in any combination of several.

[0021] The present invention will be described in detail below based on the embodiments shown in the drawings. [Brief explanation of the drawing]

[0022] [Figure 1] This is a schematic side view of a thread-forming element according to one embodiment. [Figure 2] This is a schematic cross-sectional view of the thread-forming element along the cutting line AA shown in Figure 1.

[0023] A thread-forming element 1 according to one embodiment of the present invention, which is integrally formed from a ceramic material, is shown in a schematic side view in Figure 1 and in a schematic cross-sectional view in Figure 2.

[0024] The yarn-forming element 1 comprises a spinning cone 2 having a conical tip 3. This spinning cone 2 forms a first end face side 4 having an inlet opening 5 for the yarn-forming element 1. The yarn-forming element 1 further comprises a passage-forming body 6. This passage-forming body 6 forms a second end face side 7 having an outlet opening 8 for the yarn-forming element 1. The passage-forming body 6 transitions seamlessly into the spinning cone 2, based on the fact that the yarn-forming element 1 is formed from a single member.

[0025] The passage-forming body 6 and the spinning cone 2 are connected to an inlet opening 5 and an outlet opening 8 by a through-passage 9 that communicates with each other in order to conduct yarn. This through-passage 9 is divided into three segments 18, 19, and 20, each having a different inner diameter. Each pair of consecutive segments 18, 19, and 20 transitions to each other seamlessly or without separation or connection points, with transition regions 21 and 22 interposed between them. The first through-segment 18, following the inlet opening 5, has the smallest inner diameter, and the third through-segment 20, following the outlet opening 8, has the largest inner diameter. The second through-segment 19, which is interposed between the first transition region 21 and the second transition region 22, connecting the first through-segment 18 and the third through-segment 20, has an inner diameter larger than that of the first through-segment 18 but smaller than that of the third through-segment 20. Therefore, the passage 9 is widened from the inlet opening 5 to the outlet opening 8.

[0026] The fine-spinning cone 2 has a frustoconical partial segment 10. This frustoconical partial segment 10 extends to form an intermediate chamber 13 by increasing the distance between its inner surface side 11 and the outer surface side 12 of the passage-forming body 6 that radially defines the through-passage 9 in the direction of the second end face side 7. A cylindrical partial segment 14 assigned to the fine-spinning cone 2 follows the frustoconical partial segment 10. On the side of the frustoconical partial segment 10 opposite to the cone tip 3, the cylindrical partial segment 14 transitions seamlessly, that is, without a separation / connection point, based on the fact that the yarn-forming element 1 is formed from one member. The cylindrical partial segment 14 includes a first partial segment 16 and a second partial segment 17. The inner diameter of the first partial segment 16 is equal to the inner diameter of the second partial segment 17. In contrast, the outer diameter of the first partial segment 16 is smaller than the outer diameter of the second partial segment 17. Therefore, the second partial segment 17 is formed with a greater material thickness than the first partial segment 16. The first partial segment 16 and the second partial segment 17 transition stepwise into each other on the outside. Thereby, a stopper directed towards the inlet opening 5 and a stopper directed towards the outlet opening 8 are formed.

[0027] The intermediate chamber 13 defined externally by the frustoconical partial segment 10 and the cylindrical partial segment 14 can be accessed from the direction extending from the outlet opening 8 to the inlet opening 5. The passage-forming body 6 projects beyond the fine-spinning cone 2 in the direction of the second end face side 7 or the outlet opening 8.

[0028] The yarn-forming element 1 is formed rotationally symmetrically with respect to the central longitudinal axis M of the through-passage 9.

[0029] The yarn forming element 1 is suitable for an air spinning nozzle capable of forming air spun yarn. This air spinning nozzle has corresponding mounting means for accommodating the yarn forming element 1, whereby the yarn forming element 1 can be accurately and as required positioned on the side opposite to the sliver supply part provided with the conical tip 3. For this purpose, an air spinning nozzle according to an embodiment not shown may be provided with an engagement element. This engagement element is applied to the outer surface side in the radial direction of the first partial segment 16, a stopper, and the surface side of the second partial segment 17 facing the outlet opening 8. Thereby, reliable and stable positioning of the yarn forming element 1 inside the air spinning nozzle can be achieved. Further, this positioning enables easy replacement of the yarn forming element 1.

Explanation of Signs

[0030] 1 Yarn forming element <00001​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​

Claims

1. Yarn-forming element (1) for air spinning nozzle, A spinning cone (2) having a conical tip (3) that forms a first end face side (4) having an inlet opening (5), A passage-forming body (6) that forms a second end face side (7) having an outlet opening (8), wherein the passage-forming body (6) and the spinning cone (2) are connected to each other, A through passage (9) is provided to connect the inlet opening (5) to the outlet opening (8) and the passage forming body (6) and the spinning cone (2). In a thread-forming element (1) comprising, The spinning cone (2) has a frustoconical partial segment (10), and the frustoconical partial segment (10) extends such that it forms an intermediate chamber (13) by increasing the distance between its inner surface side (11) and the outer surface side (12) of the passage forming body (6) that radially defines the through passage (9) toward the second end face side (7). The thread-forming element (1) is characterized in that it is formed integrally from a single member.

2. The spinning cone (2) has a cylindrical partial segment (14) on the side opposite to the tip of the cone (3) from the frustoconical partial segment (10), and the inner surface side (15) of the cylindrical partial segment (14) is spaced apart from the outer surface side (12) of the passage forming body (6) while extending the formed intermediate chamber (13), as described in claim 1.

3. The thread-forming element (1) according to claim 2, wherein the cylindrical partial segment (14) has a first partial segment (16) and a second partial segment (17), and the outer diameter of the first partial segment (16) is different from the outer diameter of the second partial segment (17).

4. The thread-forming element (1) according to claim 3, characterized in that the first partial segment (16) is positioned along the passage-forming body (6) closer to the tip of the cone (3) than the second partial segment (17), and the outer diameter of the second partial segment (17) is larger than the outer diameter of the first partial segment (16).

5. The thread-forming element (1) according to any one of claims 2 to 4, wherein the cylindrical partial segment (14) has a first partial segment (16) and a second partial segment (17), and the inner diameter of the first partial segment (16) is equal to the inner diameter of the second partial segment (17).

6. The yarn-forming element (1) according to any one of claims 1 to 5, characterized in that the intermediate chamber (13) is formed to be accessible from a direction extending from the outlet opening (8) to the inlet opening (5).

7. The yarn-forming element (1) according to any one of claims 1 to 6, characterized in that the passage-forming body (6) extends beyond the spinning cone (2) in the direction of the second end face side (7).

8. The thread-forming element (1) according to any one of claims 1 to 7, characterized in that the through passage (9) has at least three segments (18, 19, 20) each having different inner diameters, and each pair of consecutive segments (18, 19, 20) transitions seamlessly to one another with a transition region (21, 22) in between.

9. The yarn-forming element (1) according to any one of claims 1 to 8, characterized in that at least all surface sections for fiber guidance are coated with ceramic.

10. The thread-forming element (1) according to any one of claims 1 to 9, characterized in that the thread-forming element (1) is formed from a ceramic material.

11. The thread-forming element (1) according to any one of claims 1 to 10, characterized in that the thread-forming element (1) is formed rotationally symmetrically and / or mirror-symmetrically with respect to the central longitudinal axis (M) of the through passage (9).

12. In an air spinning nozzle for an air spinning device of an air spinning machine, An air spinning nozzle characterized by comprising a yarn-forming element (1) according to any one of claims 1 to 11.

13. In a method for producing thread-forming elements (1), The thread-forming element (1) is the thread-forming element (1) according to any one of claims 1 to 11, and the method is characterized in that the thread-forming element (1) is formed integrally from ceramics, particularly by a sintering process or a stereolithography method.

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