HK1239763B - Textile tool, use of the textile tool and method for producing the same - Google Patents

Description

The invention relates to a textile tool with a working part, by means of a thread-reservoir for the reception of a thread, and a holding part for holding and/or moving the textile tool in a textile machine. The holding part may be used, for example, for attaching and/or moving the textile tool in a textile machine. The invention also relates to the use of the textile tool and a method of its manufacture.

For example, a machine needle is subject to high wear when knitting technical textiles with abrasive yarns. Sewing needles and/or tufting needles can also be subject to high wear due to solid or abrasive material that the needle is pierced through during the textile manufacturing process.

DE 101 26 118 A1 describes a wear component with a base or core material that is coated with a thin layer of wear protection. An intermediate layer may be optional between the wear protection layer and the core material. The wear protection layer is, for example, a DLC layer. A cover layer may also be applied to the wear protection layer. The wear component may also be a thread conductor.

EP 0 844 469 A1 describes a needle which can be coated with an amorphous hydrocarbon layer.

The needle of CN 2007 40 634 Y has a shaft and a needle section, a hard chromium layer and a titanium-coated gold layer on the needle section.

US 5 546 770 A reveals a needle with a carbon layer whose thickness increases at the needle shaft towards the hook of the needle.

On this basis, it may be considered that the present invention is intended to provide an improved wear-optimized textile tool with a thread-saving capacity for the incorporation of a thread.

This task is solved by a textile tool with the characteristics of claim 1, a process of use with the characteristics of claim 14 and a manufacturing process with the characteristics of claim 15.

The textile tool according to the present invention has a holding section for holding and/or moving the textile tool in a textile machine. The holding section may also be used, for example, to move the textile tool when operating the textile machine. The textile tool also has a working section with a threaded slit. A thread to be processed is inserted or threaded into the threaded slit. Preferably, the threaded slit is closed in a ring shape and has a mouth or opening on opposite sides.

A textile tool according to the invention may be, for example, a machine needle, a machine needle or a machine needle for knitting. In the case of the machine needle, the thread gap may be formed by a passage hole (for example, a puncture needle) or by the hook inside which can be locked by means of a movable element (for example, a tongue or slide). In the case of a machine needle or a machine needle, the thread gap may be formed by the needle tube in question.

The textile tool has a core of a core material, such as a metallic material or a metallic alloy, and an example of an embodiment using a steel alloy as the core material.

The wear protection layer is preferably greater than the core material. The wear protection layer completely covers the tool core in the workpiece on an unused textile tool. It is present in particular in a front end section between a front end and the thread protection and in the thread protection area of the workpiece. The wear protection layer consists of a different material layer from the core material and may be, for example, an aluminum oxide layer, a carbon amorphous layer, a DLC layer, a carbon dioxide layer, or a titanium-carbon nitride (CNN) or titanium-carbon nitride (CNN) layer.

The wear protection layer has at least partly a lighter covering layer. The covering layer is present at least in the area of thread-saving within the working section of the textile tool. The covering layer covers the inside of the thread-saving and the outer area of the working section immediately adjacent to the edge of the thread-saving. Applying a lighter covering layer in the area of thread-saving facilitates the insertion or splitting of a thread into the thread-saving. Often, thread-saving, such as a needle hole, is facilitated relative to the thickness of a yarn or yarn, so that splitting a single layer of yarn is difficult. The covering layer facilitates the insertion or splitting of a thread into the thread-saving layer and its operation is facilitated in proportion to the thickness of a yarn or yarn, so that splitting the yarn layer is difficult.

In addition, the surface of areas covered with the cover layer may be less rough than the surface of the wear-resistant layer, thus simplifying the insertion or threading of a thread into the thread recess.

The wear protection layer may be applied by deposition on the tool core, for example by a physical or chemical process such as a PVD process, a CVD process or a PACVD process.

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Preferably, the working part of the textile tool is directly connected to a front end of the textile tool. It is advantageous if a front end of the working part following the front end of the textile tool is free of the cover layer. For example, the cover layer can be removed after applying to the wear protection layer in the front end area, for example by a mechanical process such as polishing. This front end area is particularly exposed to high wear when a textile material is passed through, such as a machine needle or machine needle, so that the cover material would be removed by the textile layer and prevent the particles from leaving the cover or being deposited in the end area of the textile material.

The front end of the workpiece may have less roughness than the rest of the workpiece. This lower roughness can be achieved, for example, by polishing. Reducing the roughness of the front end can, for example, reduce the impact force of a machine needle (sewing needle or tufting needle). Reducing the roughness (for example, polishing) can also remove the existing cover layer after coating the workpiece.

It is also advantageous if the layer thickness of the wear protection layer varies in a longitudinal direction. e.g. the thickness of the wear protection layer may be greater in the front end area than in a rear area of the workpiece opposite the front end area in a longitudinal direction or in the hold section. it is also preferred if at least part of the hold section is free of the wear protection layer and the deck layer.

The layer thickness of the wear protection layer and/or the cover layer within the threaded cover is smaller inside the threaded cover than outside the threaded cover. This makes the dimension of the threaded cover less affected by the coating. The layer thickness of the wear protection layer and/or the cover layer within the threaded cover can be chosen to be small enough so that the cover layer and/or the wear protection layer in the threaded cover area are removed during the operation of the textile machine. This makes the wear of the textile machine visually detectable.

In the area of the thread eye, the wear protection layer preferably has a layer thickness of 0,3 μm to 0,8 μm and, for example, about 0,5 μm. In the area of the thread saving layer, the cover layer preferably has a layer thickness of less than 0,1 μm and, for example, a layer thickness of 0,02 μm to 0,08 μm.

In a preferred embodiment, the layer thickness of the wear-resistant layer inside the working section and outside the threaded spacing shall be at least 1,0 μm and/or at most 5,0 μm.

It is preferable if the layer thickness of the wear protection layer within the front end section is the largest.

The layer thickness of the cover layer shall be at least 0,02 μm and/or not more than 0,3 μm within the area where it is applied to the working part of the textile tool.

The roof layer may be a metallic layer, such as a chromium layer.

The following are preferred embodiments of the invention, which are explained in detail by the accompanying drawings, showing:

Figure 1 shows an example of a textile tool in perspective.

Figure 2 the textile tool from Figure 1 in a longitudinal section.

The drawings illustrate a textile tool 10 which is shown in the example as a sewing needle 11 or which may be formed by a knitting needle or a tufting needle or the like.

The textile tool 10 extends in a longitudinal direction R along a longitudinal axis L from a front end 12 to a rear end 13.

The front end of the 12th is connected to a workpiece 15; the rear end of the 13th is connected to a holding section 16. In the case of the machine needle 11, the holding section 16 is used to tighten the machine needle 11 into a sewing machine holder. In the case of other textile tools 10, the holding section 16 may be designed to hold and/or move the textile tool. In the example, there is a transition section 17 between the workpiece 15 and the holding section 16 within which the diameter of the needle body extends to the holding section 16.

In the 15th work section, the textile tool 10 has a thread gap 20 formed by the needle no. 21 in the machine needle no. 11; the thread gap 20 completely penetrates the textile tool 10 in the example in a direction D radially to the longitudinal axis L. In a perimeter direction U around the direction D, the thread gap 20 and the needle no. 21 are completely closed. The thread gap 20 is arranged in a longitudinal direction R parallel to the longitudinal axis L at a distance to the front end 12.

A threaded groove 23 is connected to a needle nozzle 21 in front of the sewing machine needle 11 and extends in the longitudinal direction R to the outer surface of the workpiece 15 at a distance from the needle tip 14 and the needle nozzle 21.

The textile tool 10 and, for example, the machine needle 11 has a tool core 30 consisting of a core material. For example, a metal alloy, preferably a steel alloy, may be used as the core material. It has been shown that for some applications a textile tool 10 consisting of a core material is not adequately protected against wear, for example, if the material through which a needle is pierced has abrasive threads or requires high single or through force. For example, the tool core 30 is therefore covered on average with a leakage protection layer 31. The leakage protection layer covers the tool core 30 on average 15 times.

The layer thickness of the wear-resistant layer 31 is different in length R at different points on the textile tool 10 and, for example, also within the work section 15. Within the transition section 17 or the end section 16, the layer thickness of the wear-resistant layer 31 is continuously reduced to zero in the example of the rear end of the textile tool 13 in length R.

For example, a carbon-containing layer such as a DLC layer may be used as the wear-resistant layer. The DLC layer may be made as a hydrogen-containing amorphous carbon layer (a-C:H). Other wear-resistant layers 31, such as carbide or nitride layers, may also be used. For example, the wear-resistant layer 31 may alternatively be a titanium carbide layer, an aluminium titanium nitride layer, a titanium carbon nitride layer, or also an aluminium oxide layer or similar. The wear-resistant layer may be applied in a physical or chemical process, such as a PVD process, a CVD process or a PACVD process. For example, the wear-resistant layer 31 is insulating.

In a front end area 15a of the work section 15 which is directly connected to the front end 12, the wear protection layer 31 has a first layer thickness d1. In the area between the thread gap 20 and the transition section 17 and the holding section 16 respectively, the wear protection layer 31 has a second layer thickness d2. Within the thread gap 20 and the needle hole respectively 21, the wear protection layer 31 has a third layer thickness d3. The first layer thickness d1 is larger than the second layer thickness d2 and the third layer thickness d3 is smaller than the second layer thickness d3 and the third layer thickness d3 is smaller than the first layer thickness d3 and the third layer thickness d3 is the second layer thickness d3 and the third layer thickness d3 is smaller than the second layer thickness d3 and the third layer thickness d3 is less than the second layer thickness d3 on the work section.

In the embodiment, the second layer thickness d2 is approximately 1,0 μm. The first layer thickness d1 is approximately 3,0 μm. The third layer thickness d3 is approximately 0,5 μm.

The wear layer 31 is covered by a cover layer 32 at least in the area of thread gap 20 within work section 15; the cover layer 32 is lighter in colour than the wear layer 31. The cover layer 32 covers wear layer 31 within thread gap 20 and at least in an area adjacent to thread gap 20. The cover layer 32 may completely cover wear layer 31 in work section 15 outside the front end area 15a. It is also possible that the cover layer 32 covers wear layer 31 outside work section 15, or, for example, in the transition section 17 and/or section 16 at least in half.

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In the front end area 15a immediately following the front end 12, wear-resistant layer 31 is free from the deck layer 32. Deck layer 32 is present between thread gap 20 and the front end 12 only outside the front end area 15a. The front end area 15a ends at the machine needle 11 approximately at the point between the needle nozzle 21 and the needle tip 14, where the machine needle 11 has reached its greatest dimension perpendicular to the longitudinal axis L. In the example, the front end area 15a extends between the needle tip 14 and the radius of a machine axis through the longitudinal axis of the workpiece, which is located in the area 23 near the working surface of the machine needle.

As explained above, the layer thickness of wear-resistant layer 31 varies in the longitudinal direction R. The layer thickness of deck layer 32 also varies in the longitudinal direction R. Within thread span 20 and around thread span 20 deck layer 32 has a minimum layer thickness greater than the roughness of the wear-resistant layer The minimum layer thickness of deck layer 32 is, for example, 0.02 μm. Within thread span 20 deck layer 32 has a layer thickness of about 0,1 μm. In the section 15 outside of deck span 20 the thickness of deck 32 is greater than and is about 0.3 μm. In the section 15 outside of deck span 20 there is no deck 31 at the front end.

The textile tool 10 and, for example, the sewing machine needle 11 can be manufactured as follows:

First, the tool core 30 is made from the core material; then the textile tool 10 is placed in a bracket with the holding section 16 and coated with the wear-resistant layer 31 in a physical or chemical coating process; then the textile tool 10 is coated with the cover layer 32 which is applied to the wear-resistant layer 31.

The surface roughness in the front end area 15a is then reduced by a polishing process or other suitable process, which can reduce the force of impact on a textile in the machine needle 11. For example, to reduce the roughness in the front end area 15a, the coating layer 32 is removed again.

The layer thickness of the wear protection layer 31 and the cover layer 32 are so low within the thread saving 20 that when the textile tool 10 is used, they are removed by the thread passing through the thread saving 20. First, the cover layer 32 is removed by mechanical friction. This happens after a short period of use. Therefore, if the cover layer 32 is missing within the thread saving 20, it can be immediately detected that the textile tool 10 has been used. If the textile tool 20 is already used for a longer period, the very thin wear protection layer 31 already within the thread saving tool 20 is removed by friction with the thread saving tool mechanically.

The invention relates to a textile tool 10, for example a sewing needle 11 with a workpiece 15 and a holding section 16. In workpiece 15, the textile tool 10 has a thread gap 20 to absorb a thread. The textile tool 10 has a core 30 of a core material. In workpiece 15, the textile tool 10 is coated with a wear-resistant layer 31 which is different from the core material of the tool core 30. The wear-resistant layer 31 is provided in the thread gap 20 with a light cover layer 32 adjacent to the thread gap 31 within the thread gap 20 and adjacent to the thread gap 20a. Preferably, a protective layer 10 remains at the end of the textile tool 32 which is free to move.

List of reference marks:

10 Textile tool 11 Sewing needle 12 Front end 13 Rear end 14 Needle tip 15 Work section 15 Front end 16 Stop section 17 Transition section 20 Thread saving 21 Needle hole 22 Front side 23 Thread groove 30 Tool core 31 Wear protection layer 32 Deck layer DDuration of first layer thickened2 Second layer thickened3rd layer thicknessLanguage direction

Claims (16)

1. Unused textile tool (10) which has a working portion (15) with a thread cutout (20) for receiving a thread, and a holding portion (16) for holding and/or moving in a textile machine, with a tool core (30) consisting of a core material, with a wear protection coating (31) applied to the tool core (30) in the working portion (15) of the textile tool (10), and with a cover coating (32) which is brighter than the wear protection coating (31) and is present on the wear protection coating (31) at least in the region of the thread cutout (20), characterised in that the layer thickness (d3) of the wear protection coating (31) and/or the layer thickness of the cover coating (32) is smaller inside the thread cutout (20) than outside the thread cutout (20).
2. Textile tool according to claim 1, characterised in that the working portion (15) adjoins a front end (12) of the textile tool (10).
3. Textile tool according to claim 2, characterised in that a front end region (15a) of the working portion (15) is free from the cover coating (32).
4. Textile tool according to claim 3, characterised in that the front end region (15a) of the working portion (15) has a lower roughness than the other region of the working portion (15).
5. Textile tool according to any of the preceding claims, characterised in that the layer thickness (d1, d2, d3) of the wear protection coating (31) varies in a longitudinal direction (R) of the textile tool (10).
6. Textile tool according to claim 5, characterised in that the layer thickness (d1) of the wear protection coating (31) is greater at a front end region (15a) of the working portion (15) than outside the front end region (15a).
7. Textile tool according to any of the preceding claims, characterised in that at least part of the holding portion (16) is free from the wear protection coating (31) and the cover coating (32).
8. Textile tool according to any of the preceding claims, characterised in that the layer thickness (d2) of the wear protection coating (31) inside the working portion (15) and outside the thread cutout (20) is at least 1.0 µm.
9. Textile tool according to any of the preceding claims, characterised in that the layer thickness (d1, d2, d3) of the wear protection coating (31) inside the working portion (15) is most 5.0 µm.
10. Textile tool according to any of the preceding claims, characterised in that the layer thickness of the cover coating (32) in the region of the thread cutout (20) is at least 0.02 µm.
11. Textile tool according to any of the preceding claims, characterised in that the layer thickness of the cover coating (32) is at most 0.3 µm.
12. Textile tool according to any of the preceding claims, characterised in that the wear protection coating (31) is a DLC coating or a carbide coating or a nitride coating.
13. Textile tool according to any of the preceding claims, characterised in that the cover coating (32) is a metallic coating.
14. Use of a textile tool according to any of the preceding claims, with the following steps:

    - arrangement of the textile tool (10) in a textile machine,

    - insertion or threading of a thread into the thread cutout (20),

    - operation of the textile machine, wherein the cover coating (32) is mechanically removed inside the thread cutout (20).
15. Method for producing a textile tool (10) with a working portion (15) with a thread cutout (20) for receiving a thread, and a holding portion (16) for holding and/or moving the textile tool (10) in a textile machine, with the following steps:

    - production of the tool core (30) from a core material with a thread cutout (20) in the working portion (15),

    - application of a wear protection coating (31) onto the tool core (30) in the working portion (15) of the textile tool (10),

    - application of a cover coating (32) which is brighter than the wear protection coating (31) onto the wear protection coating (31) at least in the region of the thread cutout (20),

    characterised in that the layer thickness (d3) of the wear protection coating (31) and/or the layer thickness of the cover coating (32) is smaller inside the thread cutout (20) than outside the thread cutout (20).
16. Method according to claim 15, characterised in that the cover coating (32) is removed again in a front end region (15a) of the working portion (15).