Yarn monitoring device and yarn winding machine

Abstract

Provided is a yarn monitoring device in which dirt is less likely to adhere to a transmission portion. The yarn monitoring device includes a light emitting element and a light receiving element, a holding member, and a transmission portion. The light emitting element and the light receiving element are disposed on the holding member. The transmission portion faces a traveling region, is disposed at a position at which at least one of the light emitting element and the light receiving element is protected, and allows light from the light emitting element to pass therethrough. The transmission portion is composed of a transparent resin and an antistatic agent.

Description

Technical Field

[0001] This invention mainly relates to a yarn monitoring device for monitoring yarns traveling in a travel area. Background Technology

[0002] Japanese Patent Application Publication No. 2013-160678 discloses a yarn cleaner (yarn monitoring device) installed in a spinning machine to monitor the quality of spun yarn. The yarn cleaner includes a light-emitting element and a light-receiving element. The light-emitting element illuminates the yarn traveling in the yarn path. The light-receiving element receives the light passing through the yarn and converts it into an electrical signal. Transparent protective members (transmitting parts) are provided between the light-emitting element and the yarn path, and between the light-receiving element and the yarn path, respectively, to prevent dirt from easily adhering to the protective members.

[0003] Summary of the invention

[0004] The problem that the invention aims to solve

[0005] Yarn can become charged due to friction during its movement. Since the yarn travels near the transmission part, the transmission part itself may also become charged. When the transmission part is charged, surrounding fiber debris, dust, and other contaminants will adhere to it. As a result, the contaminants block light, preventing the yarn monitoring device from properly monitoring yarn quality. While Japanese Patent Application Publication No. 2013-160678 states that the purpose of providing a protective component is to prevent contaminant adhesion, it does not specifically address the generation of contaminants due to charging or the methods for removing contaminants caused by charging. Summary of the Invention

[0006] The present invention was made in view of the above circumstances, and its main purpose is to provide a yarn monitoring device that prevents dirt from easily adhering to the transmissive part.

[0007] Methods for solving problems

[0008] The problem to be solved by this invention is as described above. The means used to solve this problem and its effects are described below.

[0009] According to the present invention, a yarn monitoring device with the following structure is provided. That is, the yarn monitoring device includes a light-emitting element and a light-receiving element, a holding member, and a transmissive portion. The light-emitting element projects light onto the travel area of ​​the yarn, and the light-receiving element receives the projected light from the light-emitting element. The light-emitting element and the light-receiving element are disposed on the holding member. The transmissive portion faces the travel area, is disposed at a position protecting at least one of the light-emitting element and the light-receiving element, and allows light from the light-emitting element to pass through. The transmissive portion is constructed of a transparent resin and an anti-static agent.

[0010] Therefore, since the transmitting part contains transparent resin and an anti-static agent, light can pass through using the transparent resin, and the anti-static agent makes the transmitting part less prone to becoming charged. Even if the transmitting part is assumed to be charged, the charge can be released to the outside. Because dirt does not easily adhere to the transmitting part, yarn quality can be monitored with high precision.

[0011] In the yarn monitoring device of the present invention, it is preferable to have an upstream yarn channel guide member disposed on the side upstream of the light-receiving element in the yarn traveling direction to guide the yarn.

[0012] Therefore, since the yarn guided by the upstream yarn channel guide can be detected, the state of the yarn can be accurately detected.

[0013] In the yarn monitoring device of the present invention, the surface resistivity of the transmission part is preferably 1×10⁻⁶. 10 Ω / sq or higher, less than 1×10 15 Ω / sq.

[0014] Therefore, the transmitting part is less likely to become charged, and the damage resistance of the transmitting part can be prevented from becoming too low.

[0015] In the yarn monitoring device of the present invention, the weight of the anti-static agent is preferably 20% or less relative to the weight of the transmissive part.

[0016] Therefore, the transmitting part is less likely to become charged, and the damage resistance of the transmitting part can be prevented from becoming too low.

[0017] In the yarn monitoring device of the present invention, the surface resistivity of the transmission part is preferably 1×10⁻⁶. 14 Ω / sq or higher, 5×10 14 Below Ω / sq.

[0018] This allows for a better balance between the difficulty of charging the transmission part and its resistance to damage.

[0019] In the yarn monitoring device of the present invention, the retaining member is configured to include an anti-static agent, and the surface resistivity of the retaining member is preferably less than or equal to the surface resistivity of the transmissive portion.

[0020] Therefore, even if the transmitting part is assumed to be charged, the charge of the transmitting part can easily move to the holding member side and thus be easily released to the outside.

[0021] In the yarn monitoring device of the present invention, the anti-static agent is preferably a polymeric anti-static agent.

[0022] Therefore, leakage is less likely to occur in the transmissive part.

[0023] In the yarn monitoring device of the present invention, the anti-static agent is preferably a non-ionic anti-static agent.

[0024] This allows for thorough mixing of the transparent resin and the anti-static agent.

[0025] In the yarn monitoring device of the present invention, it is preferable to use the refractive index of the transparent resin as a reference, and the difference between the refractive index of the transparent resin and the refractive index of the anti-static agent is less than 1%.

[0026] Therefore, since the refractive index of the transparent resin is similar to that of the anti-static agent, the transparency of the transmissive part can be improved.

[0027] In the yarn monitoring device of the present invention, the mixture of transparent resin and anti-static agent is preferably formed in a uniform mixing ratio throughout the entire transmissive section.

[0028] Therefore, compared with the multi-layered structure of the transmissive part, the manufacturing process of the transmissive part becomes simpler.

[0029] In the yarn monitoring device of the present invention, the following structure is preferably adopted. The transmissive part includes a first layer and a second layer. The first layer contains at least a transparent resin. The second layer is located on the side closer to the travel area than the first layer and contains at least a transparent resin and an anti-static agent. The second layer has a higher content of anti-static agent than the first layer.

[0030] This reduces the amount of anti-static agent used and achieves the effect of preventing static electricity.

[0031] According to another aspect of the present invention, a yarn winding machine is provided. The yarn winding machine includes a yarn monitoring device, a drafting device, a spinning device, a take-up section, and a discharge section. The drafting device drafts a fiber bundle. The spinning device twists the fiber bundle to generate yarn. The take-up section takes up the yarn generated by the spinning device. The discharge section discharges the charged charge on the yarn by contacting it. In the direction of travel of the fiber bundle or yarn, the drafting device, the spinning device, the discharge section, the yarn monitoring device, and the take-up section are arranged sequentially from upstream.

[0032] This more reliably prevents the yarn monitoring device from losing its accuracy due to the electrification of the transmission part. Attached Figure Description

[0033] Figure 1 This is a front view showing the overall structure of a spinning machine according to one embodiment of the present invention.

[0034] Figure 2 This is a side view of the spinning unit.

[0035] Figure 3 This is the front view of the yarn monitoring device.

[0036] Figure 4 A cross-sectional view of the retainer is obtained by cutting a plane parallel to the direction of yarn travel.

[0037] Figure 5 A cross-sectional view of the retainer is obtained by cutting a plane perpendicular to the yarn travel direction.

[0038] Figure 6 A table showing the effect of surface resistivity on the effectiveness of preventing charging and resistance to damage.

[0039] Figure 7 A table showing the effect of the difference in refractive index between transparent resin and anti-static agent on transparency.

[0040] Figure 8 This is a cross-sectional view showing the structure of the transmission section involved in the first modified example.

[0041] Figure 9 A side view showing the spinning unit involved in the second variation. Detailed Implementation

[0042] An embodiment of the present invention will now be described with reference to the accompanying drawings. Figure 1 The spinning machine 1 shown has multiple spinning units 2 and a splicing trolley 3 arranged in parallel.

[0043] like Figure 2 As shown, each spinning unit 2, from upstream to downstream, includes a drafting device 4, a spinning device 5, a yarn monitoring device 6, a yarn storage device 7, and a take-up section 8. In this specification, "upstream" and "downstream" refer to the upstream and downstream directions of the fiber bundle and the direction of yarn travel during spinning.

[0044] The drafting device 4 drafts the fiber bundle 10. The drafting device 4 has multiple drafting rollers 11, 12, 13, and 14, and opposing rollers arranged opposite to each drafting roller. The multiple drafting rollers 11, 12, 13, and 14 are each driven to rotate at a predetermined rotational speed. The drafting device 4 stretches (drafts) the fiber bundle 10 by conveying it between the rotating drafting rollers 11, 12, 13, and 14 and the opposing roller. The fiber bundle 10, drafted by the drafting device 4, is provided to the spinning device 5.

[0045] The spinning device 5 twists the fiber bundle 10 to generate yarn 15. The structure of the spinning device 5 is not particularly limited; in this embodiment, the spinning device 5 is configured as an airflow spinning device. This airflow spinning device 5 generates a twisting airflow inside, and twists the fiber bundle 10 by applying this twisting airflow to the fiber bundle 10.

[0046] The yarn 15 generated by the spinning device 5 passes through the yarn monitoring device 6. The yarn monitoring device 6 monitors the status of the traveling yarn 15 and detects any abnormalities (yarn defects) in the quality of the yarn 15. The detailed structure of the yarn monitoring device 6 will be described later.

[0047] After passing through the yarn monitoring device 6, the spun yarn 15 is wound onto the bobbin 17 by the take-up unit 8. The take-up unit 8 includes a rocker arm 19, a take-up roller 20, and a traverse device 21.

[0048] The rocker arm 19 supports the bobbin 17 used to take up the yarn 15 so that it can rotate. The bobbin 17 is driven to rotate by the take-up roller 20 contacting and rotating with the outer peripheral surface of the take-up roller 20. The traverse device 21 includes a traverse yarn guide 22 that engages with the yarn 15 and is driven left and right (in the winding width direction of the bobbin 17). The traverse device 21 is used to traverse the yarn 15 taken onto the bobbin 17.

[0049] The spinning unit 2 with the above structure can generate yarn 15 from fiber bundle 10 and wind it onto bobbin 17.

[0050] In the spinning machine 1 of this embodiment, a yarn storage device 7 is disposed between the yarn monitoring device 6 and the take-up section 8. For example... Figure 2 As shown, the yarn storage device 7 includes a yarn storage roller 23 and an electric motor 25 that drives the yarn storage roller 23 to rotate.

[0051] The yarn accumulation roller 23 can temporarily accumulate a certain amount of yarn 15 by winding it onto its outer circumference. Because the yarn 15 is temporarily accumulated in this way, the yarn accumulation device 7 acts as a buffer. As a result, undesirable conditions (such as slack in the yarn 15) can be eliminated when the spinning speed in the spinning device 5 and the take-up speed in the take-up section 8 are inconsistent for some reason.

[0052] Each spinning unit 2 is equipped with a unit control unit 26. The unit control unit 26 appropriately controls the various structures of the spinning unit 2.

[0053] like Figure 1 and Figure 2 As shown, the connector trolley 3 is equipped with a connector device 27 and a suction device (suction tube 28 and suction nozzle 29).

[0054] The splicing device 27 is a device for joining yarn ends together. The structure of the splicing device 27 is not particularly limited; for example, an airflow splicer that twists the yarn ends together using a twisting airflow can be used. The suction tube 28 draws in and captures the yarn ends delivered from the spinning device 5, guiding them toward the splicing device 27. The suction nozzle 29 draws in and captures the yarn ends from the package 18 supported on the take-up section 8, guiding them toward the splicing device 27.

[0055] Next, the operation of the yarn monitoring device 6 when it detects a yarn defect will be briefly explained.

[0056] When the yarn monitoring device 6 detects a yarn defect (an abnormal part in the yarn 15), it sends a yarn defect detection signal to the aforementioned unit control unit 26. Upon receiving the yarn defect detection signal, the unit control unit 26 stops the spinning device 5 and cuts the yarn 15, or activates a cutter (not shown) to cut the yarn 15. The yarn 15 downstream of the cut portion is temporarily wound onto the package 18. At this time, the yarn 15 wound onto the package 18 includes the portion with the yarn defect detected by the yarn monitoring device 6. Then, the unit control unit 26 stops the winding in the winding unit 8. Next, the unit control unit 26 sends a control signal to the splicing carriage 3, causing it to move to the position where the yarn defect was detected in the spinning unit 2.

[0057] When the splicing carriage 3 stops at the position where it is operating on the spinning unit 2, the suction tube 28 is used to attract and capture the yarn ends delivered from the spinning device 5 and guide them to the splicing device 27. Before and after this, the splicing carriage 3 uses the suction nozzle 29 to attract and capture the yarn ends wound onto the package 18 and guide them to the splicing device 27. Defective portions of the yarn wound onto the package 18 are attracted and extracted by the suction nozzle 29. Thus, the portions of yarn defects detected by the yarn monitoring device 6 are removed from the package 18.

[0058] The splicing device 27 joins the yarn ends guided by the suction tube 28 and the suction nozzle 29 together. The cut yarn 15 becomes continuous again between the spinning device 5 and the take-up section 8.

[0059] When the splicing action in the splicing device 27 is completed, the unit control unit 26 restarts the winding unit 8 to wind up the spinning 15. Through the above actions, yarn defects detected by the yarn monitoring device 6 can be removed, and the winding of the spinning 15 into the package 18 can be restarted.

[0060] Reference Figures 3 to 5 The structure of yarn monitoring device 6 is described in detail.

[0061] like Figure 3 As shown, the yarn monitoring device 6 of this embodiment mainly includes a housing 30, a retainer 31, an upstream yarn channel guide 32, and a downstream yarn channel guide 33.

[0062] The housing 30 forms part of the sheath of the yarn monitoring device 6. A retainer 31, an upstream yarn channel guide 32, and a downstream yarn channel guide 33 are mounted on the housing 30.

[0063] The retainer 31 is mounted on the housing 30. Alternatively, the housing 30 and the retainer 31 can be integrated. Figure 4 and Figure 5 As shown, a travel area 34 is formed on the retainer 31. The travel area 34 is for the movement of the spinning yarn 15 and is also for the passage of the yarn monitoring device 6. Figure 5 As shown, the travel area 34 is formed into an approximately U-shape by utilizing the contour shape of its inner wall surface when cut with a plane orthogonal to the yarn channel. That is, when viewed from a direction parallel to the yarn channel, the travel area 34 has a shape in which one end of the travel area 34 is open and the other end of the travel area 34 is closed.

[0064] The retainer 31 has a set of sidewalls 35 arranged parallel to each other. The sidewalls 35 are arranged parallel to the yarn passage. The area enclosed by the set of sidewalls 35 corresponds to the travel area 34.

[0065] A light-emitting element 37 and a light-receiving element 38 are mounted on the retaining member 31. The light-emitting element 37 is, for example, an LED, which illuminates light toward the traveling region 34. The light-receiving element 38 is, for example, a photodiode, which converts the intensity of the received light into an electrical signal for output. The light-emitting element 37 and the light-receiving element 38 are configured to face each other across the traveling region 34.

[0066] A plate-shaped transmissive portion 39 is disposed between the light-emitting element 37 and the traveling region 34. Specifically, a space for arranging the light-emitting element 37 is formed in the retaining member 31, and the transmissive portion 39 is disposed in a way that seals this space. This prevents fiber debris and dust from entering the vicinity of the light-emitting element 37. The transmissive portion 39 faces the traveling region 34. The transmissive portion 39 is located between the light-emitting element 37 and the light-receiving element 38, which are arranged opposite each other. The transmissive portion 39 is a transparent or semi-transparent component, configured to allow light from the light-emitting element 37 to pass through. In this embodiment, the transmissive portion 39 is mounted on the retaining member 31, but depending on the shape of the housing 30 and the retaining member 31, the transmissive portion 39 may also be mounted on the housing 30. Transparency means that less than 20%, especially less than 10%, of the transmitted light is absorbed or scattered, and is understood to be substantially transparent to the light from the light-emitting element 37.

[0067] In this embodiment, the light-receiving element 38 is configured to contact the traveling region 34. Alternatively, a transmissive portion can be further formed to protect the light-receiving element 38. Specifically, the light-receiving element 38 can be disposed within a space formed on the retaining member 31 (a space different from the space where the light-emitting element 37 is disposed), and the transmissive portion can be disposed in a manner that closes the space. The transmissive portion 39 protecting the light-emitting element 37 and the transmissive portion protecting the light-receiving element 38 are the same in that they allow light from the light-emitting element 37 to pass through.

[0068] The upstream yarn channel guide 32 and the downstream yarn channel guide 33 are integrated with the housing 30. Alternatively, the upstream yarn channel guide 32 can be installed on the upstream side of the retainer 31, and the downstream yarn channel guide 33 can be installed on the downstream side. By guiding the traveling yarn using the upstream yarn channel guide 32 and the downstream yarn channel guide 33, the state of the yarn can be accurately measured using the light-emitting element 37 and the light-receiving element 38. Furthermore, even with only the upstream yarn channel guide 32, the state of the yarn can be accurately measured.

[0069] In the above structure, a portion of the light emitted by the light-emitting element 37 is blocked by the yarn 15, while the remainder is received by the light-receiving element 38. The intensity of the light received by the light-receiving element 38 varies depending on the thickness of the yarn 15. Thus, the yarn monitoring device 6 can detect the thickness of the yarn 15 based on the intensity of the light received by the light-receiving element 38.

[0070] Reference Figure 6 and Figure 7 This describes the adhesion of dirt caused by the yarn monitoring device 6 becoming electrified, and the materials used to remove the electrification from the yarn monitoring device 6.

[0071] The spinning yarn 15 may become electrified due to friction with the yarn guide or other components during its movement. Since the spinning yarn 15 travels near the transmission section 39 of the yarn monitoring device 6, the transmission section 39 may sometimes become electrified. When the transmission section 39 is electrified, surrounding fiber debris, dust, and other contaminants adhere to it. As a result, the contaminants block light, hindering the proper monitoring of yarn quality by the yarn monitoring device 6.

[0072] To eliminate this situation, the material of the transmissive portion 39 contains an anti-charge agent, so that the transmissive portion 39 is not easily charged, and even if the transmissive portion 39 is charged, it is easy to discharge. That is, the transmissive portion 39 is constructed using a material that mixes transparent resin and an anti-charge agent. The transparent resin is the base material of the transmissive portion 39, and is a material that allows light to pass through. Since transparent resin only needs to allow light to pass through, it also includes translucent resin. When a transmissive portion is provided to protect the light-receiving element 38, the material of the transmissive portion may also contain an anti-charge agent. That is, the "transmissive portion" in this invention includes not only the transmissive portion 39 that protects the light-emitting element 37, but also the transmissive portion that protects the light-receiving element 38. Therefore, the "transmissive portion" in this invention can be provided at a position that can protect at least one of the light-emitting element 37 and the light-receiving element 38.

[0073] Anti-static agents, such as carbon-based, nonionic, and polymeric anti-static agents, are materials that can reduce surface resistivity by being mixed into transparent resins. Nonionic anti-static agents have nonionic hydrophilic / hydrophilic moieties and are anti-static agents that do not ionize even when dissolved in water. Because nonionic anti-static agents generally have high solubility in polymers, they can be thoroughly mixed with transparent resins. Polymeric anti-static agents are polymers in which the hydrophilic moieties are embedded as conductive units within the molecule. Compared to surfactant-type anti-static agents with both hydrophobic and hydrophilic groups within a single molecule, polymeric anti-static agents have a much larger molecular weight. Because polymeric anti-static agents are less prone to coagulation and solidification (less prone to leaching) even after a period of time, they can prevent the deterioration of transparency. The anti-static agent is preferably nonionic and polymeric, and the hydrophilic moieties preferably have, for example, polyethylene oxide (PEO) chains. As such anti-charge agents, Pellestat (registered trademark) can be used, for example. Alternatively, anti-charge agents can also be ionic anti-charge agents having ionic (e.g., cationic) hydrophilic / hydrophilic groups. Anti-charge agents can also be low-molecular-weight anti-charge agents (common surfactant-type anti-charge agents).

[0074] Surface resistivity represents the value measured using a resistivity meter. Considering the application of the transmission section 39, a high surface resistivity is assumed; therefore, the measurement method used by the resistivity meter is not the four-terminal method but the double-ring method. The double-ring method involves using a probe with electrodes having a double-ring structure consisting of an inner and outer ring. A potential difference is created between the inner and outer rings, the current flowing through this point is measured, and the resistance value is calculated by adding a corresponding correction factor based on the shape of the electrodes.

[0075] From the viewpoint of improving transparency, it is preferable that the transparent resin and the anti-static agent are thoroughly mixed. Therefore, it is preferable to manufacture the material of the translucent part 39 using the following method. In the case of resin manufacturing, it is usually manufactured by melting two granular raw materials separately, mixing them, and then cooling them. In this embodiment, the two granular raw materials are melted separately, mixed, and then shaped into granules. Then, the granular raw materials are melted again, mixed, and cooled to manufacture the material. As a result, since the two materials can be thoroughly mixed, the transparency can be improved. By using this method to manufacture the translucent part 39, the mixing ratio of the transparent resin and the anti-static agent becomes uniform throughout the entire translucent part 39. Alternatively, the translucent part 39 can also be manufactured using the conventional method described above.

[0076] By incorporating an anti-static agent into transparent resin, the surface resistivity (Ω / sq, Ω / sq) can be reduced. The surface resistivity varies depending on the type or content of the anti-static agent. Figure 6This table presents the experimental results evaluating the anti-susceptibility and damage resistance of materials obtained by varying the content of the anti-susceptibility agent. For example... Figure 6 As shown, the lower the surface resistivity, the better the anti-charge effect. That is, the lower the surface resistivity, the less likely it is to generate a charge, and even if it does, it is easier to discharge. On the other hand, under the condition of lower surface resistivity, there is a tendency for damage resistance to decrease. In addition, due to the formation of scratches on the transmission part 39, the transparency of the transmission part 39 decreases, and the accuracy of the yarn monitoring device 6 in monitoring the yarn quality decreases.

[0077] from Figure 6 Experiments show that, if only the effect of preventing charging is considered, a surface resistivity of less than 1×10⁻⁶ is preferred. 15 Ω / sq. The lower limit of surface resistivity is 1×10 Ω / sq. 10 The effect of preventing charging can be confirmed when the resistivity is above Ω / sq. That is, if only the effect of preventing charging is considered, a surface resistivity of 1×10 is preferred. 10 Ω / sq or higher, less than 1×10 15 Ω / sq.

[0078] As the content of the anti-static agent increases, the damage resistance decreases. If the aforementioned surface resistivity is to be achieved using ordinary materials, the weight percentage of the anti-static agent in the total weight of the mixture is preferably 20% or less. In other words, this percentage is preferably, for example, 5% or more.

[0079] If both preventing electrostatic effects and damage resistance are considered, a surface resistivity greater than 1×10⁻⁶ is preferred. 13 Ω / sq, less than 1×10 15 Ω / sq. Additionally, 1×10 14 Ω / sq or higher, 5×10 14 Ω / sq or less is preferred.

[0080] Figure 7 This table shows the refractive indices of the base material of the transmissive section 39, namely transparent resin (material 1), and the three anti-static agents (materials 2 to 4). In this table, as an evaluation of the three anti-static agents, the ratio of their refractive indices to the transparent resin is also recorded, along with an evaluation of the transparency when they are mixed with the transparent resin. Generally, mixing materials with a greater difference in refractive index tends to worsen the transparency. Figure 7 Similarly, the evaluation of the transparency of the second and third materials, which have refractive indices similar to those of the transparent resin, is within acceptable limits. However, the evaluation of the transparency of the fourth material, which has a greater difference in refractive index, exceeds acceptable limits. Taking the above into account, the difference between the refractive index of the anti-static agent and the refractive index of the reference transparent resin is preferably less than 1%. Figure 7The refractive index of the anti-static agent is lower than that of the transparent resin, but it is clear that the same result would occur even if the refractive index of the anti-static agent were higher than that of the transparent resin. Therefore, it is preferable, for example, that the ratio of the refractive index of the anti-static agent to the refractive index of the transparent resin is greater than 99% and less than 101%. That is, based on the refractive index of the transparent resin, the absolute value of the difference between the refractive index of the transparent resin and the refractive index of the anti-static agent is less than 1%.

[0081] When the transmitting section 39 is charged and then discharged, the charge is released from the transmitting section 39 to the outside through the holding member 31. At that time, if the difference between the surface resistivity of the transmitting section 39 and the surface resistivity of the holding member 31 is too large, the charge will not easily flow from the transmitting section 39 to the holding member 31. Therefore, in order to improve the discharge performance of the transmitting section 39, an anti-charge agent is also mixed into the holding member 31. By making the surface resistivity of the holding member 31 equal to that of the transmitting section 39, or making the surface resistivity of the holding member 31 smaller than that of the transmitting section 39, it becomes easier for the charge in the transmitting section 39 to move to the holding member 31. As a result, the charge in the transmitting section 39 can be easily released to the outside. In order to make the surface resistivity of the holding member 31 and the transmitting section 39 closer, it is preferable that the anti-charge agent mixed into the transmitting section 39 is of the same type as the anti-charge agent mixed into the holding member 31. This feature is not a necessary element, and the purpose of the present invention can be achieved even if a holding member 31 without anti-charge agent is used.

[0082] The first and second modifications of the above embodiments are described below. In the description of these modifications, components that are the same as or similar to those in the aforementioned embodiments are sometimes marked with the same reference numerals in the drawings, and their descriptions are omitted.

[0083] In the above embodiment, the transmissive portion 39 is constructed using a mixture of transparent resin and an anti-static agent throughout its entire range. In contrast, Figure 8 In the first modified example shown, the transmissive portion 39 is composed of a first layer 39a and a second layer 39b. The first layer 39a is composed of transparent resin and does not contain an anti-static agent. The second layer 39b is located closer to the travel area 34 than the first layer 39a and is composed of a mixture of transparent resin and anti-static agent. The second layer 39b is a material with thickness, unlike a coating.

[0084] Since the reason why the transmission section 39 becomes charged is due to the spinning yarn 15 traveling within the travel area 34, if the second layer 39b near the travel area 34 has an anti-charge effect, it is possible to prevent dirt from adhering to the transmission section 39. Therefore, the amount of anti-charge agent used can be reduced, and the objective of the present invention can be achieved.

[0085] The first layer 39a may also contain a small amount of anti-static agent. That is, if the content of the anti-static agent in the first layer 39a is lower than the content of the anti-static agent in the second layer 39b, the amount of anti-static agent used can be reduced, and the purpose of the present invention can be achieved. The first modification is a structure in which the content of anti-static agent in a single transmissive portion 39 is different in the thickness direction (the direction of light propagation). Alternatively, the transmissive portion 39 may also be a structure in which two plates with different contents of anti-static agent are adjacent to each other in the thickness direction.

[0086] exist Figure 9 In the second modified example shown, a base component 90 is arranged downstream of the spinning device 5 and upstream of the yarn monitoring device 6 in the direction of travel of the fiber bundle 10 or the spinning yarn 15. A yarn guide 91 and a discharge section 92 are formed on the base component 90.

[0087] The yarn guide 91 guides the yarn 15 to make proper contact with the discharge section 92. The discharge section 92 is a plate-shaped metal component with a contact surface that contacts the yarn 15. With this structure, even if the yarn 15 is charged, the charge can be released to the discharge section 92.

[0088] In the second variation, the charge on the spinning yarn 15 is discharged before reaching the yarn monitoring device 6. Therefore, because the charge on the spinning yarn 15 decreases upon reaching the yarn monitoring device 6, the transmission section 39 is less likely to become charged. Thus, the effects of the present invention can be achieved more effectively.

[0089] As described above, the yarn monitoring device 6 of the above embodiment includes a light-emitting element 37 and a light-receiving element 38, a holding member 31, and a transmission part 39. The light-emitting element 37 and the light-receiving element 38 measure the state of the yarn 15 traveling in the travel area 34. The light-emitting element 37 and the light-receiving element 38 are disposed on the holding member 31. The transmission part 39 faces the travel area 34, allowing light from the light-emitting element 37 to pass through. The transmission part 39 is constructed of a transparent resin and an anti-static agent.

[0090] Because the transmissive portion 39 contains a transparent resin and an anti-charge agent, light can pass through using the transparent resin, and the anti-charge agent makes it difficult for the transmissive portion 39 to become charged. Even if the transmissive portion 39 is assumed to be charged, the charge of the transmissive portion 39 can be released to the outside. Since dirt does not easily adhere to the transmissive portion, yarn quality can be monitored with high precision.

[0091] In the yarn monitoring device 6 of the above embodiment, the surface resistivity of the transmission part 39 is 1×10⁻⁶. 10 Ω / sq or higher, less than 1×10 15 Ω / sq.

[0092] It makes it difficult for the transmissive part 39 to become charged and prevents the damage resistance of the transmissive part 39 from becoming too low.

[0093] In the yarn monitoring device 6 of the above embodiment, the weight of the anti-static agent is less than 20% of the weight of the transmission part 39.

[0094] It can make the transmissive part 39 less prone to becoming charged and can prevent the damage resistance of the transmissive part 39 from becoming too low.

[0095] In the yarn monitoring device of the above embodiment, the surface resistivity of the transmission part 39 is 1×10⁻⁶. 14 Ω / sq or higher, 5×10 14 Below Ω / sq.

[0096] It can more appropriately balance the difficulty of charging the transmission part 39 and the damage resistance of the transmission part 39.

[0097] In the yarn monitoring device 6 of the above embodiment, the retaining member 31 is made of resin incorporating an anti-static agent. Furthermore, the surface resistivity of the retaining member is lower than that of the transmissive portion 39.

[0098] Even assuming that the transmission part 39 is charged, the charge in the transmission part 39 can easily move to the side of the retainer 31 and thus be easily released to the outside.

[0099] In the yarn monitoring device 6 of the above embodiment, the anti-static agent is a polymeric anti-static agent.

[0100] Therefore, leakage is not easily generated in the transmissive part 39.

[0101] In the yarn monitoring device 6 of the above-described embodiment, the anti-static agent is a non-ionic anti-static agent.

[0102] It can fully mix transparent resin and anti-static agent.

[0103] In the yarn monitoring device 6 of the above embodiment, the refractive index of the transparent resin is used as a reference, and the difference between the refractive index of the transparent resin and the refractive index of the anti-static agent is less than 1%.

[0104] Since the refractive indices of the transparent resin and the anti-static agent are similar, the transparency of the transmissive part 39 can be improved.

[0105] In the yarn monitoring device 6 of the above embodiment, the mixture of transparent resin and anti-static agent is formed in the entire range of the transmissive section 39 with a uniform mixing ratio.

[0106] Compared to the multi-layered structure of the transmissive part 39, the manufacturing process of the transmissive part 39 is easier to simplify.

[0107] In the yarn monitoring device 6 of the first modification, the transmissive part 39 includes a first layer 39a and a second layer 39b. The first layer 39a contains at least a transparent resin. The second layer 39b is located closer to the travel area 34 than the first layer 39a, and contains at least a transparent resin and an anti-static agent. The second layer has a higher content of anti-static agent than the first layer 39a.

[0108] It can reduce the amount of anti-static agent used and still achieve the effect of preventing static electricity.

[0109] The second modification of the spinning machine 1 includes a yarn monitoring device 6, a drafting device 4, a spinning device 5, a take-up unit 8, and a discharge unit 92. The drafting device 4 drafts the fiber bundle 10. The spinning device 5 twists the fiber bundle 10 to generate yarn 15. The take-up unit 8 takes up the yarn 15 generated by the spinning device 5. The discharge unit 92 discharges the charged charge on the yarn 15 by contacting it. In the direction of travel of the fiber bundle 10 or the yarn 15, the drafting device 4, the spinning device 5, the discharge unit 92, the yarn monitoring device 6, and the take-up unit 8 are arranged sequentially from upstream.

[0110] It can more reliably prevent the decrease in monitoring accuracy of the yarn monitoring device 6 due to the electrification of the transmission part 39.

[0111] The preferred embodiments and variations of the present invention have been described above, but the above structure can be modified, for example, as follows.

[0112] In the above embodiment, the light-receiving element 38 is a structure for detecting light passing through the spinning yarn 15, but the light-receiving element 38 can also be a structure for detecting light reflected by the spinning yarn 15.

[0113] In the above embodiment, the yarn monitoring device 6 is constructed using a set of light-emitting elements 37 and light-receiving elements 38. Alternatively, it can be constructed using multiple sets of light-emitting elements 37 and light-receiving elements 38. In this structure, there may be multiple transmissive portions, but in this case, all transmissive portions can have the same surface resistivity and refractive index. In addition to the photoelectric sensor as in this embodiment, the yarn monitoring device 6 may also include a capacitive sensor. In this structure, the anti-static agent can be mixed only into the transmissive portion of the photoelectric sensor in both types of sensors.

[0114] In the above embodiment, the take-up portion 8 is arranged on the lower side of the drafting device 4 in the vertical direction, which is a layout where the yarn passage is closer to the lower side in the vertical direction as it is downstream of the spinning 15. Alternatively, the take-up device can be arranged on the upper side of the drafting device in the vertical direction. Furthermore, it is also possible for the yarn passage to be closer to the upper side in the vertical direction as it is downstream of the spinning 15.

[0115] In the above embodiment, the light-emitting element 37 and the light-receiving element 38 are configured to face each other. Alternatively, the arrangement can be changed, for example, by using a reflector or the like, so that the light-emitting element and the light-receiving element are not facing each other.

[0116] In the above embodiment, yarn 15 is drawn from the spinning device 5 using the yarn accumulation roller 23. Alternatively, instead of the yarn accumulation device 7, a feed roller pair can be provided downstream of the spinning device 5, and the yarn 15 can be drawn from the spinning device 5 using the feed roller pair. In this case, any one of the following can be provided downstream of the feed roller pair: a yarn accumulation roller, a slack elimination tube, and a mechanical compensator.

[0117] In the above embodiment, a splicing device 27 or the like is provided on the splicing trolley 3, but each spinning unit 2 may also have a splicing device 27 or the like.

[0118] In the above embodiment, a yarn monitoring device 6 is arranged downstream of the spinning device 5 and upstream of the yarn storage device 7. Alternatively, or otherwise, a yarn monitoring device may be arranged downstream of the splicing device 27. Thus, the location and number of yarn monitoring devices are just examples and can be varied. Furthermore, the present invention can be applied to yarn monitoring devices installed in any location.

[0119] In the above embodiments, examples of applying the invention to spinning machinery have been described. Alternatively, the invention can also be applied to other yarn winding machines (e.g., automatic winding machines or free-end spinning machines) equipped with yarn monitoring devices.

[0120] In the above embodiment, an example is described in which the suction nozzle 29 draws in and captures the yarn end from the package 18 supported on the take-up section 8 and guides it toward the splicing device 27. Alternatively, or otherwise, a fixed capture device for drawing in and capturing the yarn end wound onto the package 18 may be arranged at a fixed position in each spinning unit 2.

Claims

1. A yarn monitoring device, characterized in that, have: A light-emitting element that projects light onto the area where the yarn travels. A light-receiving element that receives projected light from the light-emitting element. A holding member configured with the light-emitting element and the light-receiving element, and A transmissive portion facing the travel area, positioned to protect at least one of the light-emitting element and the light-receiving element, allowing light from the light-emitting element to pass through; The transmissive portion is composed of transparent resin and an anti-static agent; The retaining element is constructed by incorporating an anti-static agent. The surface resistivity of the retaining member is lower than that of the transmissive portion.

2. The yarn monitoring device as described in claim 1, characterized in that: It has an upstream yarn channel guide that is positioned upstream of the light-receiving element in the direction of yarn travel and guides the yarn.

3. The yarn monitoring device as described in claim 1 or 2, characterized in that: The surface resistivity of the transmission section is 1×10⁻⁶. 10 Ω / sq or higher, less than 1×10 15 Ω / sq.

4. The yarn monitoring device according to any one of claims 1 to 3, characterized in that: The weight of the anti-electrostatic agent contained in the transmissive section is less than 20% of the weight of the transmissive section.

5. The yarn monitoring device as described in claim 3 or 4, characterized in that: The surface resistivity of the transmission section is 1×10⁻⁶. 14 Ω / sq or higher, 5×10 14 Below Ω / sq.

6. The yarn monitoring device according to any one of claims 1 to 5, characterized in that: The anti-electrostatic agent is a polymeric anti-electrostatic agent.

7. The yarn monitoring device according to any one of claims 1 to 6, characterized in that: The anti-electrostatic agent is a non-ionic anti-electrostatic agent.

8. The yarn monitoring device according to any one of claims 1 to 7, characterized in that: Based on the refractive index of the transparent resin, the difference between the refractive index of the transparent resin and the refractive index of the anti-static agent is less than 1%.

9. The yarn monitoring device according to any one of claims 1 to 8, characterized in that: The mixture of the transparent resin and the anti-static agent is formed at a uniform mixing ratio throughout the entire transmissive portion.

10. The yarn monitoring device according to any one of claims 1 to 8, characterized in that: The transmission part includes... It includes at least a first layer of the transparent resin, and A second layer located on the side closer to the travel area than the first layer, comprising at least the transparent resin and the anti-static agent; The second layer has a higher content of the anti-static agent than the first layer.

11. A yarn winding machine, characterized in that, have: The yarn monitoring device according to any one of claims 1 to 10, A drawing device for drawing fiber bundles. A spinning apparatus for twisting the fiber bundle to generate yarn. The take-up section that takes up the yarn generated by the spinning device, and A discharge section that discharges the charge on the yarn by contacting it. In the direction of fiber bundle or yarn travel, starting from upstream, the drafting device, the spinning device, the discharge unit, the yarn monitoring device, and the take-up unit are arranged sequentially.

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