Yarn guide element and yarn clearer for work unit of textile machine with yarn guide element
Patent Information
- Application Number
- JP2022176099
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2021-11-04
- Filing Date
- 2022-11-02
- Publication Date
- 2025-11-07
AI Technical Summary
High yarn speeds in textile machines cause undesired material removal and turbulence in yarn guidance channels, leading to yarn deterioration and difficulty in monitoring, particularly at the entry and exit of thread guide channels.
A yarn guide element with airflow compensating apertures and laminar airflow generation to reduce turbulence and improve thread guidance, using thread guide openings and airflow compensating openings to stabilize airflow.
Significantly reduces material removal and improves yarn quality, enabling efficient monitoring and processing at higher speeds.
Smart Images
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Abstract
Description
[Technical Field]
[0001] The present invention relates to a yarn guiding element for a yarn monitoring and / or yarn processing unit and to a yarn clearer for a working unit of a textile machine, comprising at least one yarn guiding element.
[0002] The winding of yarns is typically carried out at very high yarn running speeds, which leads to undesirably high material removal in areas of the textile machine surfaces that are arranged adjacent to and / or in contact with the yarn. This is the case, for example, in yarn monitoring and / or yarn processing units, in particular in the yarn guide channels of yarn clearers, in textile machines that produce take-up packages.
[0003] Due to the high travel speed and the structure and fiber ends protruding from the yarn surface, the yarn generates a wake (Sog) and, therefore, an air flow that follows Bernoulli's law along the direction of yarn travel. Accordingly, even a small change in the distance of the surface to the moving yarn, particularly a change in the width of the yarn guide channel, creates a pressure difference, resulting in undesirable turbulence. This turbulence increases material removal over time. This phenomenon is particularly pronounced in the area of the entrance and / or exit of the yarn guide channel.
[0004] Furthermore, this phenomenon is more pronounced the narrower the yarn guide channel, which preferably requires a particularly wide yarn guide channel. However, for many applications, such as for monitoring at least one yarn parameter and / or for efficient processing of the yarn, particularly narrow yarn guide channels are preferred, which requires a narrow yarn guide channel to ensure good functioning of the yarn monitoring and / or yarn processing unit, in particular the yarn clearer, and thus makes it impossible to avoid increased material removal due to undesirable turbulence formation in prior art devices.
[0005] Furthermore, such turbulence not only leads to material removal in the yarn monitoring and / or yarn processing unit, but also to a deterioration in the quality of the yarn itself, as the turbulence acts directly on the surface of the yarn, pulling out additional fiber ends from the yarn. Furthermore, the turbulence causes radial forces to act on the rapidly moving yarn, which changes the yarn extension. This, on the one hand, makes yarn monitoring significantly more difficult, and, on the other hand, causes the yarn to come into contact with the surfaces of the yarn monitoring and / or yarn processing unit, in particular the yarn clearer. This, in turn, leads to a deterioration in the quality or even damage of the yarn.
[0006] This negative phenomenon is typically particularly great in the region of the yarn guide elements which are arranged at the inlet and / or outlet of the yarn guide channel of the yarn monitoring and / or yarn processing unit, in particular the yarn clearer.
[0007] Therefore, the problem underlying the present invention is to provide a yarn guide element that significantly reduces material removal in a yarn monitoring and / or yarn processing unit, in particular a yarn clearer, and avoids deterioration of the yarn or yarn quality in the area of the yarn guide element, thereby enabling improved yarn monitoring and / or yarn processing and increased yarn speed during winding.
[0008] This object is achieved according to the invention by a yarn guiding element for a yarn monitoring and / or yarn processing unit, in particular for a yarn clearer, according to claim 1 and by a yarn clearer for a working unit of a textile machine according to claim 10. Advantageous refinements are set forth in the dependent claims.
[0009] The yarn guide element according to the invention for a yarn monitoring and / or yarn processing unit, in particular for a yarn clearer, has a yarn guide opening for guiding the yarn laterally or perpendicularly to the yarn path, a yarn receiving opening for bringing the yarn into the yarn guide opening, and an air flow compensation opening for compensating static pressure on both sides of the yarn guide element and in particular inside the yarn guide channel and / or for generating a laminar air flow at least on one side of the yarn guide element, at least in the region of the guided yarn.
[0010] Furthermore, the present invention also relates to a yarn clearer for a working unit of a textile machine, which comprises a yarn guide channel having a yarn inlet for feeding the yarn and a yarn outlet for discharging the yarn, and at least one yarn guide element, in this case preferably at least one yarn guide element according to the present invention.
[0011] The inventors have realized that by means of air flow compensation openings for compensating the static pressure on both sides of the yarn guiding element and / or for generating a laminar air flow at least in the region of the yarn on at least one side of the yarn guiding element, a significant improvement in yarn quality can be easily achieved, while at the same time a significant reduction in material removal in the yarn monitoring and / or yarn processing unit, in particular the yarn clearer. Furthermore, the yarn follows a particularly constant yarn path, which allows a significant improvement in yarn monitoring and / or processing and an increase in yarn speed.
[0012] A yarn guide element, also called an "eyelet," refers to a component or unit that guides a yarn, particularly a yarn moving rapidly along its central longitudinal axis, in at least one spatial direction, i.e., limits the position of the yarn in at least one direction and preferably keeps it constant. Preferably, the yarn is guided on at least two sides, particularly preferably at least three sides, and very particularly preferably exactly three sides, in particular radially relative to the yarn extension direction or perpendicularly to the yarn path, in particular by a yarn guide opening. Furthermore, the yarn is guided by a part of the yarn guide element, in this case particularly preferably in direct contact with a part of the yarn guide opening, in particular by a smooth surface.
[0013] Although the yarn guiding element may in principle be arranged in any device for transporting a yarn, the yarn guiding element according to the invention is provided for a yarn monitoring and / or yarn processing unit, in particular a yarn clearer, by means of which it is possible, for example, to determine the presence and / or absence of a yarn. Additionally, the yarn monitoring and / or yarn processing unit, in particular a yarn clearer, is preferably capable of detecting at least one yarn parameter and / or is preferably configured to determine yarn defects.
[0014] According to the invention, the thread is guided by the thread guide element via a thread guide opening, which may be configured in any manner, for example, as an opening, a passage open on one side, a gap, a slit, or the like. The thread guide opening may surround the thread on multiple sides or only partially around the entire circumference of the thread. Preferably, the thread guide opening has an open shape, so that the thread can be introduced into the thread guide opening from the side via the thread receiving opening without breaking the thread and / or in the intermediate region. Preferably, the thread guide opening is arranged on the thread guide element. Particularly preferably, the thread guide opening is a narrow passage or gap. The width of the thread guide opening is preferably less than 5 mm, particularly preferably less than 3 mm, and particularly preferably less than 2 mm.
[0015] The yarn path is the path of the moving yarn, which preferably extends substantially invariably in the yarn extension direction and / or along a constant trajectory and / or is set by a yarn guide element, in particular a yarn guide opening. Particularly preferably, the yarn path is linear, in particular between two yarn guide elements of a yarn clearer. Quite particularly preferably, the yarn path extends along a straight line between the yarn inlet and the yarn outlet of the yarn clearer.
[0016] The yarn clearer can be basically designed in any way and can be provided for monitoring the passing yarn and / or its parameters and / or processing the yarn, in particular for cutting off defective portions. Accordingly, the yarn clearer preferably has at least one unit for monitoring and / or processing the yarn between the yarn inlet and the yarn outlet, in particular in the yarn guide channel. In particular, the yarn clearer can have a cutting device for completely removing detected yarn imperfections and / or yarn defects, i.e., cutting off the defective portions. The yarn clearer is preferably designed for installation on a textile machine, particularly preferably a textile machine for producing take-up packages and / or a textile machine provided for rewinding.
[0017] An air flow compensation opening means at least one or exactly one opening, at least one or exactly one passageway, or at least one or exactly one passageway that allows pressure compensation of two regions located on either side of the air flow compensation opening and / or allows a gas flow or volume flow between these two regions. The air flow compensation opening may be formed by a single component or by surfaces or portions of several components. Preferably, the air flow compensation opening is arranged completely within and / or formed completely through one component. This component particularly preferably also has a yarn guide opening. Very particularly preferably, the air flow compensation opening is arranged adjacent to the yarn guide opening.
[0018] According to the present invention, one of the functions of the air flow compensation opening can be to generate a laminar air flow on one side of the yarn guide element, in particular inside the yarn monitoring and / or yarn processing unit. Generating a laminar air flow essentially means only reducing the turbulent air flow. The generated air flow is preferably primarily laminar. However, in this case, the laminar air flow may still have a low turbulence ratio. This turbulence ratio is particularly preferably as low as technically possible. Preferably, the turbulence ratio is less than 50%, particularly preferably less than 30%, very particularly preferably less than 20%, and very particularly preferably less than 10%. In the case of a yarn guide element arranged at the yarn inlet of a yarn monitoring and / or yarn processing unit, the side of the yarn guide element on which the laminar air flow is generated is preferably arranged downstream of this yarn guide element, and / or in the case of a yarn guide element arranged at the yarn outlet of this yarn monitoring and / or yarn processing unit, preferably upstream of this yarn guide element. Generally, the laminar air flow is preferably generated in a measurement channel that defines the sensor area of the yarn monitoring and / or yarn processing unit, particularly preferably within the yarn guide channel. The air flow can in principle be any gas flow. This gas flow can be formed from ambient air or can have another gas composition.
[0019] The yarn guide channel may partially surround the yarn inside the yarn clearer on several sides, completely surround it on all sides, or surround the yarn only on a portion of its circumference and be open on the remaining part. Preferably, the yarn guide channel is open on at least one side, particularly preferably on exactly one side, along the yarn extension, which allows, for example, easy introduction of the yarn.
[0020] A preferred configuration of the thread guide element specifies that the thread guide opening is formed in a fork-like manner by two thread guide sections between which the thread is guided and / or that the two thread guide sections meet in a U-, C-, or V-shaped thread guide region. Preferably, the thread guide sections extend at least partially parallel to one another and / or have a fixed distance from one another. Furthermore, preferably, the two thread guide sections are formed mirror-symmetrically to one another and / or are arranged mirror-symmetrically to one another on the thread guide element. Preferably, the thread path extends exclusively through the thread guide region, particularly preferably over a portion of the U-, C-, or V-shaped region. In this region, the thread is guided over substantially at least 90°, particularly preferably at least 135°, and particularly preferably at least 180° of its circumference.
[0021] In an advantageous configuration of the yarn guide element, the air flow compensation opening extends completely through the yarn guide element in the yarn extension direction and / or is spaced apart from and / or is adjacent to the yarn guide opening. This allows particularly efficient pressure compensation and / or particularly easy generation of a laminar air flow in the region of the yarn path. Preferably, the yarn guide opening and the air flow compensation opening extend at least in the region of one side of the yarn guide element, particularly preferably completely separated from each other. Particularly preferably, the air flow compensation opening is configured and / or arranged so that the yarn cannot reach the air flow compensation opening. In particular, a configuration of the yarn guide element is preferred in which the air flow compensation opening is arranged on the side of the yarn guide opening opposite the yarn receiving opening, preferably below and / or centrally relative to the U-shaped or V-shaped yarn guiding region where both yarn guiding sections join, when viewed in a front view of the yarn guide element.
[0022] The air flow compensation opening, in particular the air flow compensation opening directed towards the outside of the yarn monitoring and / or yarn processing unit, can basically be configured in any way and can have any shape. However, a configuration of the yarn guide element in which the air flow compensation opening is configured circular or elliptical on the inlet side to the yarn monitoring and / or yarn processing unit, in particular with an opening that is as large as possible structurally, is preferred. Alternatively or additionally, the air flow compensation opening can be configured circular or elliptical on the outlet side of the yarn from the yarn monitoring and / or yarn processing unit, as described above. A suitable circular or elliptical configuration allows for a reduced flow resistance.
[0023] To be able to control the air flow characteristics at the yarn outlet side of the yarn guide element, particularly in the yarn guide channel of a yarn monitoring and / or yarn processing unit, it is preferable for the yarn guide element to extend along the yarn path over a longer section than is necessary for mere yarn guidance. In this case, in an advantageous refinement of the yarn guide element, the length of the yarn guide opening in the yarn extension direction or along the yarn path is at least 0.75 mm to 5 mm, preferably at least 1 mm to 3 mm, and particularly preferably at least 1 mm to 2 mm. Alternatively or additionally, the length of the yarn guide opening in the yarn extension direction or along the yarn path is at least 1.5 times, preferably at least 2.0 times, particularly preferably at least 2.5 times, and particularly preferably at least 3.0 times longer than the width of the yarn guide opening. The width of the yarn guide opening refers to the distance between the two yarn guide sections, particularly in the regions arranged parallel to each other and / or in the region guiding the yarn. The length of the yarn guide opening is therefore the extension length along the yarn path or parallel to the yarn path.
[0024] Particularly preferred is a configuration of the yarn guide element formed of two consecutive sections in the direction of the yarn path. Particularly preferred is a first section for guiding the yarn and a second section for modifying the air flow. Accordingly, the yarn guide element preferably has a yarn guiding section extending in the direction of the yarn extension or along the yarn path and a flow-determining section adjacent to the yarn guiding section. Particularly preferred, no further yarn guidance takes place in the flow-determining section. Accordingly, the yarn preferably does not come into contact with the yarn guiding section in the flow-determining section, and particularly preferably does not come into contact with the surface of the yarn guiding element in the flow-determining section. The flow-determining surfaces may essentially separate the air flow compensation opening from the yarn region within the yarn guide element, or alternatively, the yarn may be guided at least partially through a region surrounded by one or more flow-determining surfaces.
[0025] In order to generate a particularly effective laminar air flow in the flow-stabilizing section and / or in the area adjacent or adjacent to the flow-stabilizing section, a preferred configuration of the yarn guide element specifies that the air flow compensation opening, preferably the entire air flow compensation opening, is formed on the side of the yarn guiding section facing away from the yarn-receiving opening and has a flow-stabilizing surface, optimized by computational fluid dynamics (CDF) calculations, at least in the extension area of the yarn guiding section along the yarn extension direction, in order to generate a laminar air flow in the flow-stabilizing section and / or in the area adjacent or adjacent to the flow-stabilizing section. In particular, a surface of the yarn guiding opening without edges and / or angles of more than 90° is preferred.
[0026] Correspondingly, an equally preferred refinement of the yarn guiding element specifies that the air flow compensation opening has a surface in the region of the yarn guiding section, preferably extending over the entire yarn guiding section, inclined by an angle of 25° to 60°, preferably 35° to 55°, particularly preferably 40° to 50°, and very particularly preferably 45° relative to the yarn extension direction. In this case, the inclination serves to form inclined ventilation channels that can perform static compensation near the base of adjacent sensor areas of the sensor. This makes it possible to keep the pressure gradient within the sensor area, preferably defined by the measurement channel assigned to the sensor, as small as possible.
[0027] According to a preferred embodiment, the air flow compensation opening has an air flow outlet plane whose normal vector is directed away from the yarn receiving opening at an angle of 0° or more with the yarn path, thereby ensuring an improved laminar flow in the region of the sensor base.
[0028] Furthermore, according to one embodiment, a positioning aid for positioning the yarn guiding element in the yarn monitoring or yarn processing unit is provided on the side of the yarn guiding element opposite the yarn receiving opening and / or the air flow compensation opening. This allows the yarn guiding element to be positioned easily and accurately, particularly at the entrance and / or exit of the sensor area of the yarn monitoring or yarn processing unit. For example, the positioning aid may be configured as a recess for receiving a correspondingly shaped protrusion, such as a flange. This allows for precise positioning at the entrance or exit of the yarn guiding channel of the yarn monitoring or yarn processing unit. Furthermore, the positioning aid may be configured to fix the yarn guiding element to the entrance or exit of the yarn guiding channel by clamping, locking, or screw fastening.
[0029] In an advantageous refinement of the yarn clearer for a working unit of a textile machine, one yarn guide element according to the invention is arranged at each of the inlet and outlet of the yarn guide channel. Preferably, both or all of the yarn guide elements of the yarn clearer are identical and / or mirror-symmetrical to one another. In the case of identical yarn guide elements, both yarn guide elements are arranged on the same side of the yarn clearer, facing each other.
[0030] An embodiment of the thread guide element according to the invention will now be described in detail with reference to the drawings. [Brief explanation of the drawings]
[0031] [Figure 1] 2 is a schematic front view of a thread guide element having an inlet side for a thread; FIG. [Figure 2] 2A and 2B are schematic cross-sectional views of two of the thread guide elements shown in FIG. 1; [Figure 3] FIG. 2 is a schematic perspective view of a thread clearer.
[0032] The yarn guide element 1 for a yarn clearer 9 of a working unit of a textile machine, shown diagrammatically in Figure 1, has two integrally formed yarn guide sections 4 arranged relative to one another in a fork-like fashion. These two yarn guide sections 4 meet in a V-shape in the direction of the yarn receiving opening 19 in a yarn guide region 5. The two yarn guide sections 4 form a gap, which serves as a yarn guide opening 2 that is open on one side. In the yarn guide region 5 of this yarn guide opening 2, the yarn can be guided at high speeds and protected against lateral deviations.
[0033] The yarn guide opening 2 has a smooth surface oriented in the direction of the yarn path, which allows the yarn to be guided at high speeds with as little adhesion as possible. However, a wake is created by the fibers protruding from the surface of the yarn moving rapidly in the direction of the yarn path. This wake creates an air flow within and downstream of the yarn guide element 1 and a pressure difference between the upstream and downstream sides of the yarn guide element 1.
[0034] In order to compensate for this static pressure difference, the yarn guide element 1 has an air flow compensation opening 3 with an oval opening below the yarn guide opening 2. This air flow compensation opening 3 passes completely through the yarn guide element 1 in the direction of the yarn path.
[0035] In this connection, Figure 2 shows two thread guide elements 1 in a schematic cross section. One thread guide element 1 is arranged on the inlet side of the thread clearer 9 and the other thread guide element 1 is arranged on the outlet side of a sensor area (not shown) extending between the two thread guide elements 1.
[0036] Now, in order to avoid a turbulent air flow at the yarn outlet side of the yarn guide element 1 and instead generate a laminar air flow, each yarn guide element 1 has a flow-determining portion 6 adjacent to and immediately adjacent to the yarn guiding portion 7 along the yarn path. The yarn guide element 1 is formed in one piece with the yarn guiding portion 7 and the flow-determining portion 6.
[0037] The flow-stabilizing portion 6 has at least one flow-stabilizing surface 8, which has been optimized by computational fluid dynamics calculations, so that a particularly laminar air flow is generated in and downstream of the yarn guide element 1. The yarn guide element 1 has a flow-stabilizing surface 8 in the yarn guiding portion 7. The flow-stabilizing surface 8 extends at an angle of approximately 45° to the yarn or yarn path and deflects the generated air flow.
[0038] 3 shows a schematic perspective view of an embodiment of a yarn clearer 9 with a yarn guiding element 1 as described above. The yarn guiding element 1 is arranged along the yarn path at the entrance to the sensor area 10 of the yarn clearer 9. Alternatively or additionally, according to another embodiment, such a yarn guiding element 1 can be arranged along the yarn path at the exit of the sensor area 10.
[0039] The illustrated embodiment of the yarn clearer 9 includes a three-part housing body 11 with first and second housing parts 12, 13, each housing part housing a sensor mechanism for monitoring a yarn passing through a sensor area 10 defined by the yarn guide element 1 on the inlet side. For example, one of the first and second housing parts 12, 13 may include a capacitive sensor mechanism, while the other housing part may include an optical sensor mechanism for monitoring different yarn parameters. A third housing part 14 of the housing body 11 is arranged adjacent to the second housing part 13 along the yarn path. The third housing part 14 partially encloses a cutting device with a cutting knife 15 that crosses the yarn path of the yarn clearer 9 and includes a stop 16 for the cutting knife 15 for severing a yarn (not shown) extending between them. [Explanation of symbols]
[0040] 1 Thread guide element 2 Thread guide opening 3 Air flow compensation opening 4 Thread guide part 5 V-shaped thread guide area 6 Flow statically settled part 7 Thread guide part 8 Flow static surface 9. Thread Clear 10 Sensor Area 11 Housing body 12 first housing part 13 Second housing part 14 Third housing part 15 cutting knife 16 Stopper 17 Notches / Locating Aids 18 flange 19 Yarn receiving opening
Claims
1. A yarn guiding element (1) for a yarn monitoring and / or yarn processing unit, comprising: - a yarn guide opening (2) for guiding the yarn laterally relative to the yarn path; a thread receiving opening (19) for bringing said thread into said thread guide opening (2); air flow compensation openings (3) for compensating the static pressure on both sides of the yarn guiding element (1) and / or for generating a laminar air flow on one side of the yarn guiding element (1), at least in the region of the guided yarn; A thread guiding element (1) comprising:
2. Thread guide element (1) according to claim 1, characterized in that the thread guide opening (2) is formed in a fork-like shape by two thread guide sections (4) between which the thread is guided and / or the two thread guide sections (4) meet in a U-shaped or V-shaped thread guiding region (5).
3. 3. The thread guide element (1) according to claim 1, wherein the air flow compensation opening (3) passes completely through the thread guide element (1) in the direction of thread extension and / or is spaced apart from and / or arranged adjacent to the thread guide opening (2).
4. 3. The thread guide element (1) according to claim 1 or 2, characterized in that the air flow compensation opening (3) is arranged on the side of the thread guide opening (2) opposite the thread receiving opening (19), in particular centrally with respect to the thread guide opening (2).
5. 3. The yarn guide element (1) according to claim 1 or 2, characterized in that the air flow compensation opening (3) is circular or elliptical in its opening plane.
6. 3. The thread guide element (1) according to claim 1 or 2, characterized in that the length of the thread guide opening (2) along the thread path is at least 1 mm to 3 mm and / or the length of the thread guide opening (2) along the thread path is at least 2.0 times longer than the width of the thread guide opening (2).
7. 3. The yarn guide element (1) according to claim 1 or 2, characterized in that it comprises a yarn guiding portion (7) extending along the yarn extension direction and a flow-static portion (6) extending along the yarn extension direction and adjacent to the yarn guiding portion (7), in which no yarn guiding is performed.
8. 8. The yarn guiding element (1) according to claim 7, characterized in that the air flow compensation opening (3) is formed on the side of the yarn guiding part (7) facing away from the yarn receiving opening (19) and has a flow-stabilizing surface (8) optimized in the direction of yarn extension at least in the extension region of the yarn guiding part (7), in particular by computational fluid dynamics calculations, in order to generate a laminar air flow in the flow-stabilizing part (6) and / or in the region adjacent to the flow-stabilizing part (6).
9. 8. The yarn guiding element (1) according to claim 7, characterized in that the air flow compensation opening (3) has a flow-stabilizing surface (8) extending over the yarn guiding section (7) and inclined at an angle of 40° to 50° with respect to the yarn extending direction.
10. 3. The yarn guiding element (1) according to claim 1 or 2, characterized in that the air flow compensation opening (3) has an air flow outlet plane having a normal vector directed away from the yarn receiving opening (19) at an angle to the yarn path.
11. 3. The yarn guiding element (1) according to claim 1 or 2, characterized in that a positioning aid (17) for positioning the yarn guiding element (1) in a yarn monitoring or yarn processing unit is provided on the side of the yarn guiding element (1) opposite the yarn receiving opening (19) and / or the air flow compensation opening (3).
12. A yarn clearer (9) for a working unit of a textile machine, comprising: a yarn guide channel having a yarn inlet for feeding the yarn and a yarn outlet for discharging the yarn; - at least one thread guide element (1) according to claim 1 or 2; A yarn clearer (9) for a working unit of a textile machine, comprising:
13. 13. A yarn clearer (9) for a working unit of a textile machine according to claim 12, characterized in that a yarn guiding element (1) is arranged at each of the entrance and / or exit of the yarn guiding channel.
14. 13. A yarn clearer (9) for an operating unit of a textile machine according to claim 12, characterized in that the yarn guide passage defines at least one sensor area (10) of a sensor surrounded by the yarn clearer (9) for detecting defined parameters of the yarn running through the yarn guide passage, and a normal vector of an air flow outlet plane of the air flow compensation opening (3) is directed towards an edge area of the sensor area (10) opposite the yarn receiving opening (19).