Yarn guide and clearer for a textile machine station having a yarn guide

Abstract

The invention relates to a yarn guide for a yarn monitoring and / or yarn processing unit and to a clearer for a textile machine station having a yarn guide for yarn monitoring and / or yarn processing. In order to provide a yarn guide which significantly reduces material wear at the yarn monitoring and / or yarn processing unit, avoids a reduction in the quality of the yarn in the region of the yarn guide and at the same time enables an improvement in the yarn monitoring and / or yarn processing and an increase in the speed of the yarn during winding, the yarn guide is provided with a yarn guide hole for guiding the yarn laterally in the path of movement of the yarn, a yarn entry hole for feeding the yarn into the yarn guide hole and an air flow balancing hole for balancing the static pressure on both sides of the yarn guide and / or for generating a laminar air flow at least on one side of the yarn guide in the region of the yarn.

Description

Technical Field

[0001] The present invention relates to yarn guides for yarn monitoring and / or yarn processing units, and yarn clearers for textile machine stations having at least one yarn guide. Background Technology

[0002] Yarn winding is typically performed at high yarn travel speeds, resulting in undesirable and severe material abrasion in the adjacent and / or contact surfaces of the yarn on the textile machine. This, for example, involves the yarn monitoring and / or yarn processing units on textile machines that manufacture winding bobbins, particularly the yarn guide channels of the clearer.

[0003] Due to the high-speed motion and the structure and the yarn ends protruding from the yarn surface, the yarn experiences a so-called suction effect, which is accompanied by an airflow along the direction of yarn movement, conforming to Bernoulli's law. Correspondingly, small variations in the distance from the surface to the moving yarn, and especially variations in the width of the yarn guide channel, result in a pressure differential, leading to undesirable turbulence, which causes more severe material wear over time. This effect is particularly pronounced in the inlet and / or outlet regions of the yarn guide channel.

[0004] Furthermore, the narrower the yarn guide channel, the stronger this effect, thus a particularly wide yarn guide channel is preferred. However, for many applications, such as for monitoring at least one yarn parameter and / or for efficient yarn processing, a particularly narrow yarn guide channel is preferred. Therefore, a narrow yarn guide channel is required to ensure the good functioning of the yarn monitoring and / or yarn processing unit, especially the yarn clearer, thus avoiding more severe material wear caused by the formation of undesirable turbulence in prior art devices.

[0005] Furthermore, this turbulence not only causes material wear at the yarn monitoring and / or yarn processing units, but also weakens the quality of the yarn itself. The turbulence can act directly on the yarn surface while other yarn ends can be pulled out. Additionally, the turbulence causes forces to act radially on the rapidly moving yarn, potentially altering its direction. This makes yarn monitoring much more difficult and may cause the yarn to contact the surfaces of the yarn monitoring and / or yarn processing units, especially the yarn clearer, potentially leading to further weakening or even damage to the yarn.

[0006] The negative effects are particularly pronounced in the yarn guide area, which is typically located in the yarn guide channel of the yarn monitoring and / or yarn processing unit, especially at the inlet and / or outlet of the yarn clearer. Summary of the Invention

[0007] Therefore, the present invention provides a yarn guide that significantly reduces material wear in yarn monitoring and / or yarn processing units, especially in the yarn clearer, avoids weakening of yarn quality in the area of ​​the yarn guide, and simultaneously improves yarn monitoring and / or yarn processing as well as increases yarn speed during winding.

[0008] According to the present invention, this task is accomplished by a yarn guide for a yarn monitoring and / or yarn processing unit, particularly a yarn clearer, and by a yarn clearer for a textile machine station.

[0009] The yarn guide of the present invention for yarn monitoring and / or yarn processing unit, especially yarn clearer, has a yarn guide hole for guiding the yarn orthogonally to the yarn movement path or laterally, a yarn receiving hole for feeding the yarn into the yarn guide hole, and an airflow balancing hole for balancing the static pressure on both sides of the yarn guide, especially in the yarn guide channel, and / or for generating laminar airflow at least on one side of the yarn guide in at least the area of ​​the guided yarn.

[0010] In addition, the present invention also relates to a yarn clearer for a textile machine station, having a yarn guide channel including a yarn inlet for feeding yarn and a yarn outlet for discharging yarn, and at least one yarn guide element, preferably at least one yarn guide element of the present invention.

[0011] The inventors have discovered that by using airflow balancing holes to balance the static pressure on both sides of the yarn guide and / or to generate laminar airflow at least on one side of the yarn guide in the yarn region, a significant reduction in material wear of the yarn monitoring and / or yarn processing unit, especially the yarn clearer, can be achieved in a simple manner, while simultaneously achieving a significant improvement in yarn quality. Furthermore, the yarn follows a particularly constant yarn movement path, thereby achieving significant improvements in yarn monitoring and / or yarn processing, as well as higher yarn speeds.

[0012] A yarn guide, also known as a "yarn guide eyelet," refers to a component or structural unit that guides a yarn, particularly a yarn moving rapidly along its central longitudinal axis, in at least one spatial direction; that is, the yarn position is defined and preferably kept constant in at least one direction. Yarn guidance is preferably performed, particularly by means of a yarn guide eyelet, at least on both sides, and especially preferably at least on three sides, and even more particularly preferably exactly on three sides, particularly in the radial direction of the yarn or orthogonal to the yarn movement path. Yarn guidance is also preferably performed in direct contact with a portion of the yarn guide, and particularly preferably in the form of a yarn guide eyelet, particularly by means of a smooth surface.

[0013] While the yarn guide can theoretically be arranged on any device used for conveying yarn, the yarn guide of the present invention is configured for yarn monitoring and / or yarn processing units, particularly yarn clearers, for example, to determine the presence and / or absence of yarn. The yarn monitoring and / or yarn processing unit, particularly the yarn clearer, is also preferably capable of measuring at least one yarn parameter and / or preferably configured to determine yarn defects.

[0014] According to the invention, the yarn is guided through the yarn guide member by means of a guide hole that can be configured arbitrarily in principle, such as an open channel, a gap, a slit, etc. The guide hole may surround the yarn on multiple sides or only within a portion of its circumference. The guide hole preferably has an open shape, allowing the yarn to be passed laterally into the guide hole without being cut and / or with the central area via the yarn receiving hole. Preferably, the guide hole is arranged within the yarn guide member. The guide hole is particularly preferably a narrow channel or slit, wherein the width of the guide hole is preferably less than 5 mm, particularly preferably less than 3 mm, and even more particularly preferably less than 2 mm.

[0015] The yarn movement path is the path of the moving yarn and preferably extends substantially unchanged along the yarn direction and / or along a constant motion trajectory and / or through the yarn guides, especially through the yarn guide holes. Particularly preferably, the yarn movement path is linear, particularly between the two yarn guides of the yarn clearer. More particularly preferably, the yarn movement path extends along a straight line between the yarn inlet and yarn outlet of the yarn clearer.

[0016] The yarn clearer can be configured arbitrarily and simultaneously equipped with a function to monitor passing yarns and / or their parameters and / or process the yarns, particularly cutting off defective sections. Accordingly, the yarn clearer preferably has at least one unit for monitoring and / or processing the yarns between the yarn inlet and the yarn outlet, and particularly in the yarn guide channel. In particular, the yarn clearer may have a cutting device to remove detected yarn defects and / or yarn flaws, i.e., to cut off defective sections. The yarn clearer is preferably configured to be mounted on a textile machine, particularly preferably a textile machine for manufacturing winding bobbins and / or a textile machine for rewinding bobbins.

[0017] An airflow balancing hole refers to at least one orifice, at least one orifice, or at least one flow channel that allows pressure balance and / or airflow or volumetric flow between two regions located on either side of the airflow balancing hole. Here, the airflow balancing hole can be formed by a single component or by the surfaces or sections of multiple components. Preferably, the airflow balancing hole is entirely arranged within and / or entirely formed by a single component, wherein the component particularly preferably also has the yarn guide hole. More particularly preferably, the airflow balancing hole is arranged adjacent to the yarn guide hole.

[0018] According to the invention, one function of the airflow balancing hole is to generate laminar airflow, particularly within the yarn monitoring and / or yarn processing unit, on the side of the yarn guide. Generating laminar airflow primarily refers to reducing air turbulence, but here, the generated airflow is primarily laminar. However, the laminar airflow should, as before, have a low proportion of turbulence, which is particularly preferably as low as technically possible. Preferably, the turbulence proportion is less than 50%, particularly preferably less than 30%, even more preferably less than 20%, and especially preferably less than 10%. The side of the yarn guide where laminar airflow is generated is preferably positioned after the yarn guide when it is arranged at the yarn inlet of the yarn monitoring and / or yarn processing unit, and / or preferably before the yarn guide when it is arranged at the yarn outlet. Generally, laminar airflow is preferably generated within the measurement channel defining the sensor area of ​​the yarn monitoring and / or yarn processing unit, and particularly preferably within the yarn guide channel. The airflow can, in principle, be any airflow, which can be formed not only from ambient air but should also have other gas compositions.

[0019] The yarn guide channel may partially, multiple times, or all sides surround the yarn within the yarn clearer, or it may only surround a portion of the yarn's circumference and is, in addition, open. Preferably, the yarn guide channel is open on at least one side, and especially preferably exactly on one side, along the yarn's direction, to facilitate, for example, easy yarn introduction.

[0020] A preferred design of the yarn guide specifies that the yarn guide hole is forked and configured with two yarn guide portions, between which the yarn is guided and / or they converge in a yarn guide area preferably U-shaped, C-shaped, or V-shaped. Preferably, the yarn guide portions extend parallel to each other at least partially and / or have a constant mutual spacing. More preferably, the two yarn guide portions are configured and / or arranged radially symmetrically on the yarn guide. Preferably, the yarn movement path extends only within the yarn guide area and, more preferably, in portions of the U-shaped, C-shaped, or V-shaped area, in which the yarn is guided substantially up to at least 90°, more preferably at least 135°, and even more preferably 180° of its circumference.

[0021] In an advantageous design of the yarn guide, the airflow balancing hole completely penetrates the yarn guide along the yarn direction and / or is spaced apart from and / or adjacent to the yarn guide hole, thereby generating particularly efficient pressure balance and / or particularly easy laminar airflow in the area of ​​the yarn movement path. Preferably, the yarn guide hole and the airflow balancing hole extend completely apart from each other, at least in a region on one side of the yarn guide. It is particularly preferred that the airflow balancing hole is formed and / or arranged such that the yarn does not enter the airflow balancing hole. It is particularly preferred that the airflow balancing hole is arranged on the side of the yarn guide hole facing away from the yarn hole, preferably in the front view of the yarn guide, below the U-shaped or V-shaped yarn guide area where the two yarn guides meet, and / or centrally arranged with respect to the yarn guide hole.

[0022] The airflow balancing holes, especially those aligned with the outer surface of the yarn monitoring and / or yarn processing unit, can be designed arbitrarily and have any shape. However, a preferred yarn guide design is one in which the airflow balancing holes are designed as circular or elliptical on the inlet side leading into the yarn monitoring and / or yarn processing unit, and are particularly configured to have an orifice with the largest possible structure. Alternatively or additionally, the airflow balancing holes may also be circular or elliptical on the outlet side of the yarn leaving the yarn monitoring and / or yarn processing unit, in the form described above. The preferred circular or elliptical design allows for reduced flow resistance.

[0023] To control the airflow characteristics on the yarn exit side of the yarn guide, and particularly in the yarn guide channel of the yarn monitoring and / or yarn processing unit, it is preferable that the yarn guide extends through a section along the yarn movement path that is longer than is required for simple yarn guidance. Here, the length of the guide hole along the yarn direction or the yarn movement path, in advantageous improvements to the yarn guide, is at least between 0.75 mm and 5 mm, preferably at least between 1 mm and 3 mm, and particularly preferably at least between 1 mm and 2 mm. Alternatively or additionally, the length of the guide hole along the yarn direction or the yarn movement path is at least 1.5 times, preferably at least 2.0 times, particularly preferably at least 2.5 times, and even more particularly preferably at least 3.0 times greater than the width of the guide hole. The width of the guide hole, here, refers to the distance between two guide sections, particularly in areas arranged parallel to each other and / or in areas guiding the yarn. The length of the guide hole is correspondingly the extension dimension of the yarn movement path or parallel to the yarn movement path.

[0024] Particularly preferred is a yarn guide design comprising two successive sections in the direction of the yarn movement path, wherein a first section is particularly preferred for guiding the yarn and a second section is preferred for altering the airflow. Accordingly, the yarn guide preferably has a guiding portion extending along the yarn direction or the yarn movement path and an adjacent flow-stabilizing portion, wherein further yarn guidance does not occur in the flow-stabilizing portion. Accordingly, the yarn preferably does not contact the guiding portion in the flow-stabilizing portion, and particularly preferably, the yarn does not contact the surface of the yarn guide in the flow-stabilizing portion. The flow-stabilizing surface can, in principle, separate the airflow balancing holes from the yarn portion within the yarn guide, or alternatively, the yarn can be guided through an area at least partially surrounded by one or more flow-stabilizing surfaces.

[0025] To generate laminar airflow particularly effectively, the preferred design of the yarn guide specifies that the airflow balancing hole is formed on the side of the yarn guide opposite to the yarn receiving hole, and preferably the entire airflow balancing hole has a flow-stabilizing surface optimized by numerical fluid dynamics (CDF) calculations, at least along the extension of the yarn guide along the yarn direction, to generate laminar airflow in the flow-stabilizing section and / or in the adjacent region. Here, it is particularly preferred that the yarn guide hole surface has no edges and / or no angle greater than or equal to 90°.

[0026] Accordingly, a preferred improvement to the yarn guide specifies that the airflow balancing hole has a surface angled relative to the yarn direction at an angle between 25° and 60°, preferably between 35° and 55°, particularly preferably between 40° and 50°, and even more particularly preferably at 45°, in the yarn guide region and preferably extending throughout the entire yarn guide region. Here, the angle is used to form a bent ventilation channel, thereby generating static balance near the bottom surface of the adjacent sensor area of ​​the sensor. This allows for maintaining a minimal pressure drop within the sensor area, preferably defined by the measurement channel associated with the sensor.

[0027] According to a preferred embodiment, the airflow balancing hole includes an airflow outlet plane whose normal vector points in the direction extending from the self-guiding yarn hole when it forms an angle equal to or greater than 0° with the yarn movement path. This ensures improved laminar flow in the sensor's bottom region.

[0028] Preferably, according to one embodiment of the yarn guide, a positioning aid is provided for positioning the yarn guide on one side of the back-to-back yarn hole and / or airflow balancing hole of the yarn guide on the yarn monitoring or yarn processing unit. The yarn guide can therefore be positioned more easily and accurately, particularly at the inlet and / or outlet of the sensor area of ​​the yarn monitoring or yarn processing unit. For example, the positioning aid can be designed to accommodate a recess of a correspondingly configured protrusion, such as a flange, thereby achieving precise placement at the inlet or outlet of the yarn guide channel of the yarn monitoring or yarn processing unit. More preferably, the positioning aid can be designed such that the yarn guide is fixed to the inlet or outlet of the yarn guide channel by means of clamping, locking, or threaded connection.

[0029] In an advantageous improvement to a yarn clearer for a textile machine station, a yarn guide according to the invention is provided at both the inlet and outlet of the yarn guide channel. Preferably, the two or all of the yarn guides of the clearer are identical and / or mirror-symmetrically configured. When the yarn guides are identical, it is preferable that the two yarn guides are respectively arranged on the clearer with their sides aligned with each other. Attached Figure Description

[0030] An embodiment of the yarn guide of the present invention will be described in detail below with reference to the figures, wherein:

[0031] Figure 1 A front view schematic diagram showing a yarn guide with a yarn inlet side is shown;

[0032] Figure 2 Two examples are shown. Figure 1 The diagram shows a cross-sectional view of the yarn guide; and

[0033] Figure 3 A perspective diagram of a yarn clearing device is shown.

[0034] List of reference numerals

[0035] 1 yarn guide

[0036] 2 yarn guide holes

[0037] 3 airflow balance holes

[0038] 4 Yarn guiding section

[0039] 5V-shaped yarn guide area

[0040] 6. Flow Stabilizer

[0041] 7 Yarn guiding section

[0042] 8 steady flow surface

[0043] 9. Yarn Cleaner

[0044] 10 sensor areas

[0045] 11. Outer shell

[0046] 12 First outer shell section

[0047] 13 Second outer shell section

[0048] 14 Third outer shell section

[0049] 15 cutting blades

[0050] 16 stops

[0051] 17 Notch / Positioning Auxiliary Parts

[0052] 18 flanges

[0053] 19 yarn receiving holes Detailed Implementation

[0054] like Figure 1The yarn guide 1 of the yarn clearer 9 schematically shown for a textile machine station is a one-piece structure and has two forked yarn guide sections 4 arranged opposite each other, which converge in a V-shape from the direction of the yarn receiving hole 19 in the yarn guide area 5. Here, the two yarn guide sections 4 form a slit, which serves as a one-sided open yarn guide hole 2. Within the yarn guide area 5 of the yarn guide hole 2, the yarn can be guided at high speed and protected from lateral deviation from the yarn movement path.

[0055] The yarn guide hole 2 has a smooth surface oriented in the direction of the yarn movement path, which allows the yarn to be guided to move at high speed with minimal adhesion. However, the fibers protruding from the surface of the yarn moving rapidly in the direction of the yarn movement path create a suction effect, which results in airflow in and after the yarn guide 1 and a pressure difference before and after the yarn guide 1.

[0056] To balance the static pressure difference, the yarn guide 1 has an airflow balancing hole 3 with an elliptical opening below the yarn guide hole 2, wherein the airflow balancing hole 3 completely passes through the yarn guide 1 in the direction of the yarn movement path.

[0057] Figure 2 Relatedly, two yarn guides 1 are shown in the cross-sectional schematic diagram, wherein one yarn guide 1 is arranged on the inlet side of the sensor area (not shown) extending between the two yarn guides 1 of the yarn clearer 9, and the other yarn guide 1 is arranged on its outlet side.

[0058] In order to avoid air turbulence on the yarn outlet side of the yarn guide 1 and instead generate laminar airflow, each yarn guide 1 has a flow stabilizing part 6 adjacent to and closely connected to the yarn guide section 7 along the yarn movement path. Here, the yarn guide 1, the yarn guide section 7 and the flow stabilizing part 6 are integrally formed.

[0059] The flow stabilizing section 6 here has at least one flow stabilizing surface 8, which is optimized by numerical fluid dynamics calculations to generate, in particular, laminar airflow within and after the yarn guide 1. Here, the yarn guide 1 has a flow stabilizing surface 8 in the yarn guide section 7, which extends at an angle of approximately 45° to the yarn or yarn movement path and causes a deflection of the resulting airflow.

[0060] Figure 3 An embodiment of a yarn clearer 9 having the yarn guide 1 as described above is shown in perspective. The yarn guide 1 is arranged along the yarn movement path on the inlet side of the sensor area 10 of the yarn clearer 9. Alternatively or supplementing this, according to another embodiment, such a yarn guide 1 can be arranged along the yarn movement path on the outlet side of the sensor area 10.

[0061] According to the illustrated embodiment, the yarn clearer 9 includes a three-piece housing body 11 with first and second housing portions 12 and 13, respectively, for housing sensor devices that monitor yarns traversing a sensor area 10 defined by the yarn guide 1 on the inlet side. For example, one of the first and second housing portions 12 and 13 may have a capacitive sensor device, and the other housing portion may have an optical sensor device to monitor different yarn parameters. A third housing portion 14 of the housing body 11 is arranged adjacent to the second housing portion 13 along the yarn movement path, wherein the third housing portion 14 partially covers the cutting device of the cutting blade 15 that crosses the yarn movement path of the yarn clearer 9 and includes a stop 16 for cutting the cutting blade 15 (not shown) extending therebetween.

Claims

1. A yarn guide (1) for a yarn monitoring and / or yarn processing unit, the yarn guide (1) comprising: - A yarn guide hole (2) for laterally guiding the yarn in the yarn movement path. - A yarn receiving hole (19) for feeding the yarn into the yarn guide hole (2), and - Airflow balancing hole (3), the airflow balancing hole (3) is used to balance the static pressure on both sides of the yarn guide (1) and / or to generate laminar airflow on one side of the yarn guide (1) at least in the area of ​​the guided yarn. in, The yarn guide (1) has a second yarn guide portion (7) extending along the yarn direction and a flow stabilizing portion (6) extending along the yarn direction and adjacent to the second yarn guide portion (7), in which yarn guidance does not occur. The airflow balancing hole (3) is formed on the side of the second yarn guide portion (7) opposite to the yarn receiving hole (19) and has a flow stabilizing surface (8) at least in the extension range of the second yarn guide portion (7) along the yarn direction, so as to generate laminar airflow in the flow stabilizing portion (6) and / or in the region adjacent to the flow stabilizing portion (6).

2. The yarn guide (1) according to claim 1, characterized in that, The yarn guide hole (2) is forked and has two first yarn guide portions (4) that guide the yarn between the yarn guide portions and / or the yarn guide portions converge in a U-shaped or V-shaped yarn guide area (5).

3. The yarn guide (1) according to claim 1 or 2, characterized in that, The airflow balance hole (3) passes completely through the yarn guide (1) in the yarn direction and / or is spaced apart from and / or adjacent to the yarn guide hole (2).

4. The yarn guide (1) according to claim 1, characterized in that, The airflow balance hole (3) is arranged on the side of the yarn guide hole (2) opposite to the yarn receiving hole (19).

5. The yarn guide (1) according to claim 1, characterized in that, The airflow balancing hole (3) is designed to be circular or elliptical in its orifice plane.

6. The yarn guide (1) according to claim 1, characterized in that, The length of the yarn guide hole (2) along the yarn movement path is at least between 1 mm and 3 mm, and / or the length of the yarn guide hole (2) along the yarn movement path is at least 2.0 times greater than the width of the yarn guide hole (2).

7. The yarn guide (1) according to claim 1, characterized in that, The airflow balancing hole (3) has a flow-stabilizing surface (8) that extends through the second yarn guide (7) and is angled relative to the yarn direction at an angle between 40° and 50°.

8. The yarn guide (1) according to claim 1, characterized in that, The airflow balance hole (3) includes an airflow outlet plane, the normal vector of which is angled with the yarn movement path and points in the direction extending away from the yarn receiving hole (19).

9. The yarn guide (1) according to claim 1, characterized in that, A positioning aid (17) is provided, which is used to position the yarn guide (1) on the yarn monitoring or yarn processing unit on the side of the yarn guide (1) opposite to the yarn receiving hole (19) and / or the air flow balance hole (3).

10. The yarn guide (1) according to claim 4, characterized in that, The airflow balance hole (3) is arranged on the side of the yarn guide hole (2) opposite to the yarn receiving hole (19), and is centrally located about the yarn guide hole (2).

11. The yarn guide (1) according to claim 1, characterized in that, The airflow balancing hole (3) has a flow-stabilizing surface (8) optimized by numerical hydrodynamic calculations, at least within the extension range of the second yarn guide (7) along the yarn direction.

12. A yarn clearer (9) for a station of a textile machine, said yarn clearer (9) having: - A yarn guide channel having a yarn inlet for feeding yarn and a yarn outlet for discharging yarn. - At least one yarn guide (1) according to any one of the preceding claims.

13. The yarn clearer (9) for a station on a textile machine according to claim 12, characterized in that, A yarn guide (1) is provided at the entrance and / or exit of the yarn guide channel.

14. The yarn clearer (9) for a station on a textile machine according to claim 12 or 13, characterized in that, The yarn guide channel defines at least one sensor area (10) of a sensor included in the yarn clearer (9) for detecting specified parameters of the yarn passing through the yarn guide channel, wherein the normal vector of the airflow outlet plane of the airflow balance hole (3) points to the edge area of ​​the sensor area (10) opposite to the yarn receiving hole (19).

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