TW202037550A - A composite rigid tube for yarn winding - Google Patents

Abstract

The invention relates to the field of weaving looms for tubular fabric. In particular, the invention relates to the bobbins that are used to wind yarn that is used to make the tubular fabric. The present invention provides durable bobbin tubes of reduced wear, thereby addressing the problem of unacceptably high wear of the aluminium tubes that form the core of the bobbins. In order to achieve the objective, the invention discloses a composite rigid tube (1B) comprising a rigid core tube (1A), and an end cover (5) having a ring (6), characterised in that on the inner surface (2) of said rigid core tube (1A) is provided at least one spoke (4), and that said end cover has at least one protrusion (7) protruding axially from said ring (6), wherein said end cover is push fitted onto each end of said rigid core tube (1A).

Description

Composite rigid tube for yarn winding

The present invention relates to the field of cylindrical fabric manufacturing. In particular, the present invention relates to a bobbin for winding yarns used to make cylindrical fabrics.

In a circular loom, the weft yarn is set in a shuttle that rotates with the reed. Generally speaking, the weft yarn bobbin is held between two end flanges that clamp the inner surface of the tube of the bobbin, thereby preventing the tape/yarn from falling off the bobbin during the laying of the weft yarn in the fabric.

In addition, when laying the weft yarn in the fabric, the weft yarn bobbin is unwound (rotated) along its axis in the shuttle body. When the laying of the weft yarn is performed at a constant speed (linear, m/s), the rotation speed of the weft yarn package in the shuttle increases as the package diameter decreases. The higher and varying unwinding rotation speed increases and changes the yarn/belt tension, resulting in a significant change in fabric width.

With the continuous development of winding loom technology, there has been a significant increase in the production speed of circular looms. This has also increased the bobbin rotation speed, which ultimately leads to an increase in bobbin wear and higher fabric width changes. In addition, the bobbin is provided with end flanges. The purpose of the end flange is to contain the wound material on the bobbin and not allow it to leave the bobbin during the unwinding process. The shuttle bobbin holder is made of hard material. During the unwinding procedure, there is relative movement between the bobbin holder and the inner tube of the bobbin. In the case where the inner tube is made of soft metal, the friction between the end flange and the inner tube of the bobbin causes the abrasion of the inner tube of the bobbin. Generally, when the bobbin is made of aluminum, the metal dust formed by abrasion is relatively high, so that the fabric is contaminated.

There is the possibility of using a non-metal core (for example, a paper tube or a phenolic resin impregnated tube). However, these attempts have not been commercially successful because the paper tube is not reusable and the phenolic resin tube is expensive due to its complicated manufacturing process.

There is a need to solve the problem of fabric width variation while at the same time providing durable bobbins by avoiding wear due to friction in circular looms. The goal of the present invention: The main objective of the present invention is to reduce the variation of fabric width, especially at the bottom part of the weft yarn package. Another object of the present invention is to provide a durable bobbin with reduced wear. Another objective of the present invention is to provide an economic solution for the industry.

The present invention relates to the field of weaving machines for cylindrical fabrics. In particular, the present invention relates to a bobbin used for winding the yarn used to make the cylindrical fabric. The present invention provides durable bobbins with reduced wear, thereby solving the problem of unacceptably high wear of the metal tubes forming the core of the bobbins. In order to achieve the goal, the present invention discloses a composite rigid tube (1B) for yarn winding, which includes a rigid core tube (1A); and an end cover (5) with a ring (6); the composite rigid tube (1B) is characterized in that: at least one spoke (4) is arranged on the inner surface (2) of the rigid core tube (1A), and that the end cap has at least one protrusion ( 7), wherein the end cap is pushed and fitted to each end of the rigid core tube (1A).

Generally speaking, a weft bobbin is made of aluminum or mild steel and has an outer diameter of approximately 32 mm to 34 mm and a thickness of 1 mm to 2 mm. During the operation of a circular loom, it has been observed that there is a significant change/decrease in the width of the fabric, which can be about 8% to 10%, compared to the required fabric width, especially during the final stage when the weft bobbin is exhausted. small.

The inventor realized that one way to overcome this problem is to increase the outer diameter of the bobbin core tube (1A) on which the yarn is wound. However, in doing so, the inventor will need to also ensure that the inner diameter will be suitable (small enough) to install these bobbins on existing spindles. In order to achieve structural integrity and reduce the overall weight of the bobbin, a set of spokes (4) are introduced on the inner surface (2) of the bobbin.

In the simplest form of the bobbin (1), it is made of only a bobbin core tube (1A).

In the present invention (Figure 1), a bobbin (1A) has an inner surface (2) and an outer surface (3), and a set of spokes (4) are arranged on the inner surface (2)-at least one spoke is arranged . The outer diameter (1D) of the bobbin (1) is increased to approximately 40 mm to 45 mm and the inner diameter (1C) remains suitable for holding on the precedent winding device. According to the present invention, the tube has a hollow spoke structure to reduce the overall weight of the tube (1).

As another aspect of the present invention, and in order to avoid the abrasion of the end part of the tube (1A), an end cap (5) made of polymer wear-resistant material is introduced on the end of the tube (1A), thereby making As seen from Figure 4 a composite bobbin (1B). Figure 5 shows a longitudinal sectional view taken on the diameter of the core tube (1A) of Figure 4; The protrusion (7) is tightly fitted with the spokes (4), thereby forming an inner surface (1E) of the composite bobbin (1B) at its end.

As shown in Figure 1, the bobbin core tube (1A) according to the present invention has a hollow structure with spokes (4) distributed radially, resulting in a higher rigidity of the bobbin (1) (compared to conventional bobbins). Here, it is possible to increase the outer diameter (1D) of the bobbin (1) and thereby reduce the rotation speed during the depletion of the weft bobbin. This configuration helps to reduce the overall tube weight and is manufactured by an economical extrusion process.

The present invention achieves the desired goal by revealing a composite bobbin rigid core tube (1B) with a bobbin core tube (1A), the bobbin core tube (1A) has a hollow cylindrical shape, which has spokes (4); and The developed end cap (5) is set at the end of the bobbin core tube (1A). As seen from Figure 2, the end cap (5) has a rim (6); and a protrusion (7), which forms a tight fit (or interlock) with the spokes (4) of the tube (1). The end cap (5) is pushed in and fitted at the end of the core tube (1A).

In another aspect (see Fig. 3), the present invention discloses a composite bobbin (1B) made of a core tube (1A), one end cover (5), and one end flange (8) as appropriate. The core tube of the bobbin (1A) has at least one inwardly directed spoke (4) connecting its inner surface and outer surface (2 and 3). The shape of the spokes (4) provided on the inner surface (2) of the bobbin (1) and the protrusions (7) provided on the end cap (5) correspond to each other, so that when the end cap (5) is pushed into the fitting When installed on the bobbin core tube (1A), there is an effective positioning restriction for the relative movement between the end cap (5) and the bobbin (1). At least one spoke (4) is arranged to connect the inner surface of the barrel (1) with the outer surface (2, 3), and the spoke (4) is radially positioned. The front connection has the function of interlocking the composite tube (1) tube and one of the end caps (5), which reliably prevents the end cap (5) from rotating and axial displacement relative to one of the tube (1). Now the end cap (5) is in contact with the end flange (8) instead of the tube (1) in contact with the end flange (8). Therefore, the end cap (5) made of durable material protects the bobbin core tube (1A) from wear caused by friction with the end flange (8) at its end, thereby keeping the length of the bobbin core tube (1A) constant This gives the bobbin core tube (1A) an extremely long life. Therefore, only replace the end cap (5) when necessary.

In a preferred embodiment, generally speaking, the end cap (5) is made of plastic, preferably a wear-resistant polymer material (for example, polyamide blended with fiber reinforced material and/or black carbon) . Rubber can also be used to make the end cap (5).

In another preferred embodiment, the end cap (5) is made of elastic material, preferably a blend of wear-resistant synthetic rubber material, fiber reinforced material and/or black carbon.

The end cap (5) may have a textured surface for easy clamping and removal. Preferably, the textured surface is in the form of knurling.

The end flange (8) also has axially extending protrusions (8A-see Figure 3), which are more like thin metal strips, which give them the ability to behave like springs in the lateral direction. The outer diameter of the protrusion (8A) of the end flange protrusion is slightly larger than the diameter of the inner surface of the composite rigid core tube (1B). Therefore, once the end flange is pushed and fitted to the end of the tube (1), the end flange protrusion (8A) is pressed on the inner surface of the tube (1B) and also pressed on the inner surface of the spokes (4) And hold it firmly in place. Therefore, the relative movement between the end flange (8) and the tube (1) is further reduced.

The material of the bobbin (1) is selected from suitable light-weight material alloys (for example, aluminum alloy) that will provide sufficient light weight, low wear and higher rigidity.

In addition, the bobbin made of the composite rigid tube (1B) has a larger outer diameter than a conventional bobbin with the same weight. In other words, for example, a 45 mm diameter bobbin of the present invention has almost the same weight as a 32 mm conventional steel pipe. Larger diameter bobbins are advantageous in the upstream of the operation (for example, a winding machine), where for the same rpm, a higher linear speed of approximately 35% to 50% can be achieved.

Therefore, the bobbin made of the composite rigid tube (1B) can wind the incoming yarn/tape with a lower tension due to the relatively lower rotation speed and subsequently, during the formation of the braid/fabric, the lower rotation speed results in Lower unwinding tension, resulting in a more uniform width cylindrical fabric.

In one aspect of the present invention, the end cap (5) is made of elastic material. In another aspect of the present invention, the edge (6A) of the ring (6) of the end cap (5) is chamfered. In another aspect of the present invention, the end cap (5) has a textured outer surface (6B) on its ring (6) for easy clamping and removal.

In another aspect of the present invention, the rigid core tube (1A) is colored to assist in identifying different batches of weft yarn packages and better sensed by the weft yarn end sensing device on the loom. In another aspect of the present invention, the rigid core tube (1A) is perforated to reduce the weight of the tube.

From the foregoing discussion, it is obvious that the present invention has several embodiments.

In particular, the present invention discloses a composite rigid tube (1B) for yarn winding, which includes a rigid core tube (1A); and an end cover (5) with a ring (6); the composite rigid tube (1B) is characterized in that: at least one spoke (4) is arranged on the inner surface (2) of the rigid core tube (1A), and that the end cap has at least one protrusion ( 7), wherein the end cap is pushed and fitted to each end of the rigid core tube (1A).

In another embodiment, the present invention discloses a composite rigid tube (1B), wherein the tube (1B) has an end flange that is pushed into the end cap (5), and the end flange (8) It has at least one axially extending protrusion (8A).

In another embodiment, the present invention discloses a composite rigid tube (1B), wherein the end flange (8) is preferably selected from plastic, preferably polyamide materials and fiber reinforced materials and/or black carbon The blend is made of any metallic or non-metallic material that forms a polymer group.

In another embodiment, the present invention discloses a composite rigid tube (1B) in which the plastic is fiber reinforced.

In another embodiment, once the end cap is fitted to the rigid tube (1B), the protrusion (7) extends over a portion of the length of the rigid tube (1B).

In another embodiment, the edge (6A) of the ring (6) is chamfered.

In another embodiment, the outer surface (6B) of the end cap (5) is rough textured.

In another embodiment, the rigid tube (1B) is colored white to improve the sensitivity of the weft end sensor for black yarn.

Although the above description contains a lot of peculiarities, these peculiarities should not be construed as limitations on the scope of the present invention, but as an illustration of its preferred embodiments. It must be recognized that modifications and changes are possible based on the disclosure content given above without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should not be determined by the illustrated embodiments, but by the scope of the attached patent application and its legal equivalents.

1: bobbin/composite bobbin/tube/bobbin 1A: Rigid core tube / bobbin rigid core tube / bobbin core tube / bobbin tube / tube / core tube 1B: Composite rigid tube / composite rigid tube / composite tube / composite tube rigid core tube / composite rigid core tube / tube / rigid tube 1C: inner diameter/inner diameter 1D: Outer diameter 1E: internal surface/internal surface 2: inner surface 3: outer surface 4: spokes 4A: The inner diameter of a virtual circle formed by the inner surface of the spoke 5: end cap 6: Ring/Rim 6A: Edge/Edge of Ring 6B: External surface of the ring/textured external surface/external surface 7: Protruding part/Protruding part of end cap 8: End flange 8A: Projection of end flange/projection of axial extension/projection of end flange/projection

Figure 1 shows the composite bobbin of the present invention. Figure 2 shows the end cap of the present invention. Figure 3 shows the assembly of the composite bobbin and the end flange. Figure 4 shows the core tube with end caps fitted thereon. Fig. 5 shows a longitudinal cross-sectional view taken on the diameter of the core tube of Fig. 4;

1A: Rigid core tube / bobbin rigid core tube / bobbin core tube / bobbin tube / tube / core tube

1B: Composite rigid tube / composite rigid tube / composite tube / composite tube rigid core tube / composite rigid core tube / tube / rigid tube

5: end cap

6: Ring/Rim

7: Protruding part/Protruding part of end cap

Claims (12)

A composite rigid tube (1B) for yarn winding, which includes a rigid core tube (1A); and an end cover (5), which has a ring (6); the composite rigid tube (1B) is characterized by: At least one spoke (4) is arranged on the inner surface (2) of the rigid core tube (1A), and the end cap has at least one protrusion (7) protruding axially from the ring (6), wherein the end cap It is pushed and fitted to each end of the rigid core tube (1A). For example, the composite rigid tube (1B) of claim 1, wherein the tube (1B) has an end flange (8) that is pushed in and fitted to the end cap (5), wherein the end flange (8) has at least An axially extending protrusion (8A). Such as the composite rigid tube (1B) of claim 2, wherein the end cap (5) is selected from a group consisting of a blend of plastic, preferably polyamide material, fiber reinforced material, and/or black carbon Made of any polymer material. Such as the composite rigid tube (1B) of claim 2, wherein the end flange (8) is selected from a group consisting of a blend of plastic, preferably polyamide material, fiber reinforced material and/or black carbon Made of any polymer material. Such as the composite rigid tube (1B) of claim 2, wherein the end cap (5) is selected from a group consisting of a blend of elastic materials, preferably wear-resistant synthetic rubber materials, fiber reinforced materials and/or black carbon Made of any material of the group. Such as the composite rigid pipe (1B) of claim 2, wherein the end flange (8) is made of any metal material selected from a group consisting of alloys with elastic properties. The composite rigid tube (1B) of any one of claims 1 to 5, wherein the protrusion (7) extends over a portion of the length of the rigid tube (1B). Such as the composite rigid tube (1B) of any one of claims 1 to 6, wherein the edge (6A) of the ring (6) is chamfered. The composite rigid tube (1B) of any one of claims 1 to 6, wherein the outer surface (6B) of the end cap (5) is rough textured. The composite rigid tube (1B) of any one of claims 1 to 6, wherein the rigid tube (1B) is colored. Such as the composite rigid tube (1B) of any one of claims 1 to 6, wherein the rigid tube (1B) is white in color. Such as the composite rigid tube (1B) of any one of claims 2 to 6, wherein the outer diameter of the protrusion (8A) is slightly larger than the diameter of the inner surface (1E) of the composite rigid core tube (1B), whereby the end The flange protrusion (8A) presses on the inner surface of the tube (1B) and also presses on the inner surface of the spokes (4) and is firmly held in place.

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