Yarn monitoring device

Abstract

The yarn monitoring device (10) of the present application is provided with a housing (5) and a yarn monitoring unit (6) disposed in the housing (5). The yarn monitoring unit (6) has a first monitoring portion (63) that monitors the state of a yarn (Y) traveling in a traveling space (R1), an upper yarn path guide (65) that guides the traveling yarn (Y), and a first holder (61) that sets the first monitoring portion (63) and the upper yarn path guide (65). The upper yarn path guide (65) has an upper charge removing portion (65a) that removes an electric charge generated by the traveling of the yarn (Y). The housing (5) has an upper housing (51) that is electrically connected to the upper charge removing portion (65a). The resistivity of the upper charge removing portion (65a) is equal to or higher than the resistivity of the upper housing (51).

Description

Technical Field

[0001] This invention relates to a yarn monitoring device. Background Technology

[0002] Previously, a technology relating to a yarn monitoring device for measuring the state of a traveling yarn was known. The yarn monitoring device described in Japanese Patent Application Publication No. 2017-36140 includes a holder housing a sensor component for measuring the state of a traveling yarn. The holder has a traveling area for the yarn and a yarn guide for guiding the yarn within the traveling area. The yarn guide guides the traveling yarn to pass through the traveling area. The yarn guide is formed of a wear-resistant material such as ceramic or titanium and has high electrical resistance.

[0003] In the yarn monitoring device described in Japanese Patent Application Publication No. 2017-36140, when the yarn travels within the device, it comes into contact with a yarn guide made of a material with high electrical resistance. Therefore, static electricity is generated on the yarn guide and the yarn. This static electricity poses a potential hazard to the yarn monitoring device. For example, it could cause malfunctions or damage to the device. Summary of the Invention

[0004] The purpose of this invention is to provide a yarn monitoring device that suppresses the effects of static electricity.

[0005] One aspect of the present invention is a yarn monitoring device for monitoring the state of a yarn traveling within a travel space, comprising a housing and a yarn monitoring unit disposed within the housing. The yarn monitoring unit includes: a monitoring section for monitoring the state of the yarn traveling within the travel space; a yarn guide for guiding the traveling yarn; and a holder for housing the monitoring section and the yarn guide. The yarn guide includes a de-energizing section disposed close to the travel space and for de-energizing charges generated by the travel of the yarn. The housing has a connecting section electrically connected to the de-energizing section. The resistivity of the de-energizing section is greater than or equal to the resistivity of the connecting section.

[0006] According to this yarn monitoring device, static electricity generated on the yarn guide and the yarn is guided to the connecting part via the static elimination section. Thus, static electricity can be removed from the yarn monitoring device. As a result, the effects of static electricity can be suppressed in the yarn monitoring device. Furthermore, the resistivity of the static elimination section is higher than that of the connecting part. Therefore, since charge diffuses more easily in the connecting part, static electricity is more effectively guided from the static elimination section to the connecting part. As a result, the effects of static electricity can be more effectively suppressed in the yarn monitoring device.

[0007] Alternatively, the yarn guide can be an upstream yarn guide positioned upstream of the yarn in the direction of travel, and the static eliminator can be an upstream static eliminator located on the upstream yarn guide. With this structure, static electricity can be removed from the yarn traveling within the travel space. As a result, the effects of static electricity can be suppressed in the yarn monitoring device.

[0008] Alternatively, the yarn guide can be a downstream yarn guide positioned relative to the downstream side of the yarn's travel direction, and the static eliminator can be a downstream static eliminator located on the downstream yarn guide. With this structure, static electricity can be removed from the yarn traveling towards the outside of the yarn monitoring device. As a result, the effects of static electricity can be suppressed in external devices where the yarn monitoring device is installed.

[0009] Alternatively, the yarn guide may have an upstream yarn guide relative to the upstream side of the yarn being held in the direction of travel, and a downstream yarn guide relative to the downstream side of the yarn being held in the direction of travel. The static eliminator may have an upstream static eliminator on the upstream yarn guide and a downstream static eliminator on the downstream yarn guide. With this structure, static electricity can be removed from the yarn traveling within the travel space. Furthermore, static electricity can also be removed from the yarn traveling towards the outside of the yarn monitoring device. The effects of static electricity can be suppressed in the yarn monitoring device, and simultaneously, the effects of static electricity can be suppressed in the external device on which the yarn monitoring device is installed.

[0010] The connection part can also be electrically connected to the ground potential. According to this structure, since static electricity is removed from the excitation part through the connection part that is electrically connected to the ground potential, the effects of static electricity can be suppressed in the yarn monitoring device.

[0011] Alternatively, the yarn monitoring device may also include: a first conductive component disposed on the housing; and a substrate, which transmits information acquired by the monitoring unit to the outside of the yarn monitoring device and is electrically connected to a ground potential, with the connection portion electrically connected to the substrate via the first conductive component. According to this structure, since static electricity is removed from the connection portion via the first conductive component and the substrate, the effects of static electricity can be suppressed in the yarn monitoring device.

[0012] Alternatively, the yarn monitoring device may further include: a first conductive member disposed on the housing; and a substrate that transmits information acquired by the monitoring unit to the outside of the yarn monitoring device and is electrically connected to a ground potential; a yarn guide member having an upstream yarn guide member relative to the upstream side of the yarn travel direction and a downstream yarn guide member relative to the downstream side of the yarn travel direction; an electric shock eliminator having an upstream electric shock eliminator provided on the upstream yarn guide member and a downstream electric shock eliminator provided on the downstream yarn guide member; a connecting portion having an upstream connecting portion in contact with the upstream electric shock eliminator and a downstream connecting portion in contact with the downstream electric shock eliminator; the upstream connecting portion being in contact with and electrically connected to the downstream connecting portion; and the upstream connecting portion or the downstream connecting portion being electrically connected to the substrate via the first conductive member. According to this structure, since static electricity is removed from the upstream connecting portion and the downstream connecting portion via the first conductive member and the substrate, the effects of static electricity can be suppressed in the yarn monitoring device.

[0013] Alternatively, it may also include: a first conductive member and a second conductive member disposed on the housing; and a substrate that transmits information acquired by the monitoring unit to the outside of the yarn monitoring device and is electrically connected to a ground potential; a yarn guide member having an upstream yarn guide member relative to the upstream side of the yarn travel direction and a downstream yarn guide member relative to the downstream side of the yarn travel direction; an electric shock eliminator having an upstream electric shock eliminator provided on the upstream yarn guide member and a downstream electric shock eliminator provided on the downstream yarn guide member; a connecting portion having an upstream connecting portion in contact with the upstream electric shock eliminator and a downstream connecting portion in contact with the downstream electric shock eliminator; the upstream connecting portion being electrically connected to the lower connecting portion via the second conductive member; and the upstream connecting portion or the downstream connecting portion being electrically connected to the substrate via the first conductive member. According to this structure, since static electricity is removed from the upstream connecting portion and the downstream connecting portion via the first conductive member, the second conductive member, and the substrate, the effects of static electricity can be suppressed in the yarn monitoring device.

[0014] Alternatively, the resistivity of the connection portion can be higher than that of the first conductive component. According to this structure, static electricity is more effectively guided from the connection portion to the substrate via the first conductive component. As a result, the effects of static electricity can be more effectively suppressed in the yarn monitoring device.

[0015] Alternatively, the static-eliminating part of the yarn guide can be made of a conductive material and have a guiding surface for guiding the yarn. With this structure, when the yarn directly contacts or approaches the guiding surface of the static-eliminating part made of conductive material, static electricity is more effectively guided from the static-eliminating part to the connecting part. As a result, the effects of static electricity can be more effectively suppressed in the yarn monitoring device.

[0016] Alternatively, the static-eliminating part of the yarn guide can be formed of conductive resin or conductive ceramic. According to this structure, static electricity is more effectively guided from the static-eliminating part to the connecting part.

[0017] Alternatively, the yarn guide may have: a guide body including a guide surface for guiding the yarn; and a static eliminator mounted on the guide body and including a static eliminator portion, wherein the guide body has a groove defined by the guide surface, and the static eliminator portion of the static eliminator is disposed along the groove. According to this structure, since static electricity is more effectively guided from the guide surface to the connecting portion via the static eliminator, static electricity can be removed from the guide surface more effectively. As a result, the effects of static electricity can be suppressed in the yarn monitoring device. Furthermore, by mounting the static eliminator on the guide body, static electricity can be removed from the guide surface without changing the structure of the guide body.

[0018] Alternatively, the resistivity of the ionization section could be 1.0 × 10⁻⁶. 6 Below Ω〃m. Based on this structure, static electricity generated on the yarn is more effectively removed by the static eliminator.

[0019] Alternatively, the yarn guide may have: a leading edge for guiding the traveling yarn; and an inclined surface connected to the leading edge and extending upstream and / or downstream of the leading edge in the direction of travel, inclined in a manner away from the travel space. According to this structure, for example, compared to the case where the yarn is guided by a guiding surface formed as a surface in the direction of yarn travel, the reduced contact area between the yarn and the yarn guide allows for the suppression of static electricity generation on both the yarn and the yarn guide.

[0020] Invention Effects

[0021] According to one aspect of the present invention, static electricity can be removed from the yarn monitoring device. As a result, the effects of static electricity can be suppressed in the yarn monitoring device. Attached Figure Description

[0022] Figure 1 This is a side view of a spinning machine according to the first embodiment of the present invention.

[0023] Figure 2 yes Figure 1 A three-dimensional view of the yarn monitoring device in a spinning machine.

[0024] Figure 3 yes Figure 2 An exploded perspective view of the yarn monitoring device.

[0025] Figure 4 It means Figure 3 A cross-sectional view of the yarn guide of the yarn monitoring device.

[0026] Figure 5This is an exploded perspective view of the yarn monitoring device according to the second embodiment of the present invention.

[0027] Figure 6 yes Figure 5 An exploded stereoscopic view of the yarn monitoring device from another viewpoint.

[0028] Figure 7 yes Figure 5 A top view of the yarn monitoring device.

[0029] Figure 8 This is a diagram showing a modified example of a yarn guide.

[0030] Figure 9 This is a diagram showing a modified example of a yarn guide.

[0031] Figure 10A , Figure 10B and Figure 10C These are cross-sectional views of the yarn guide member, representing a modified example. Detailed Implementation

[0032] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, in the description of the drawings, the same elements are labeled with the same reference numerals, and repeated descriptions are omitted.

[0033] [First Implementation Method]

[0034] like Figure 1 As shown, the spinning machine 1 includes multiple spinning units 2, a yarn receiving carriage 3, and a doffing carriage (not shown). The multiple spinning units 2 are arranged in a row. Each spinning unit 2 generates yarn Y and winds it into a package P. When yarn Y is cut in a spinning unit 2 or breaks for some reason, the yarn receiving carriage 3 performs a yarn receiving operation in that spinning unit 2. When package P becomes a full package in the spinning unit 2, the doffing carriage unwinds package P and supplies a new yarn bobbin to the spinning unit 2.

[0035] like Figure 1 As shown, each spinning unit 2, from upstream in the yarn Y-direction of travel, is equipped with a drafting device 4, an air spinning device 9, a yarn monitoring device 10, a tension sensor 11, a yarn retention device 12, a waxing device 13, and a winding device 14. A unit controller (not shown) is provided for each specified number of spinning units 2 and controls the operation of the spinning units 2.

[0036] The drafting device 4 drafts the yarn (fiber bundle) S. The drafting device 4 has, sequentially from the upstream side, a rear roller pair 41, a third roller pair 42, an intermediate roller pair 43, and a front roller pair 44 in the direction of travel of the yarn S. Each roller pair 41, 42, 43, and 44 has a lower roller and an upper roller. The lower roller is driven to rotate by a drive motor located in each spinning unit 2, etc. A belt 45a is provided for the lower roller of the intermediate roller pair 43. A belt 45b is provided for the upper roller of the intermediate roller pair 43. Furthermore, in the following description, the side with the belt 45b will be referred to as the "front side" and the opposite side as the "rear side" for the traveling yarn Y.

[0037] The air spinning device 9 generates yarn Y by twisting the fiber bundle F, which has been drafted by the drafting device 4, using a swirling airflow. More specifically (but not shown in the figures), the air spinning device 9 includes a spinning chamber, a fiber guide section, a swirling airflow generating nozzle, and a hollow guide shaft. The fiber guide section guides the fiber bundle F supplied from the drafting device 4 on the upstream side into the spinning chamber. The swirling airflow generating nozzle is positioned around the path of the fiber bundle F and generates a swirling airflow within the spinning chamber. The swirling airflow causes the ends of the multiple fibers constituting the fiber bundle F to reverse and swirl. The hollow guide shaft guides the yarn Y from the spinning chamber to the outside of the air spinning device 9.

[0038] The yarn monitoring device 10 monitors the state of the traveling yarn Y between the air spinning device 9 and the yarn holding device 12, and detects the presence of yarn defects based on information related to the monitored state. If a yarn defect is detected, the yarn monitoring device 10 sends a yarn defect detection signal to the unit controller. For example, the yarn monitoring device 10 detects abnormalities in the thickness of the yarn Y and / or foreign matter contained in the yarn Y as yarn defects. The yarn monitoring device 10 also detects yarn breaks, etc. The tension sensor 11 measures the tension of the traveling yarn Y between the air spinning device 9 and the yarn holding device 12, and sends a tension measurement signal to the unit controller. If the unit controller determines that an abnormality has occurred based on the detection results of the yarn monitoring device 10 and / or the tension sensor 11, the yarn Y is cut in the spinning unit 2. Specifically, the generation of the yarn Y is interrupted by stopping the supply of air to the air spinning device 9, thereby cutting the yarn Y. Alternatively, the yarn Y can be cut using a separately provided cutter.

[0039] The waxing device 13 applies wax to the yarn Y between the yarn holding device 12 and the winding device 14. The yarn holding device 12 holds the yarn Y between the air spinning device 9 and the winding device 14.

[0040] The winding device 14 winds yarn Y onto a yarn bobbin to form a package P. The winding device 14 has a rocker arm 141, a winding drum 142, and a traverse guide 143. The rocker arm 141 supports the yarn bobbin in a rotatable manner. The rocker arm 141 is oscillatingly supported by a support shaft 144, and the surface of the yarn bobbin or the package P contacts the surface of the winding drum 142 with appropriate pressure. The winding drums 142 of multiple spinning units 2 are driven simultaneously by a drive motor (not shown). Thus, the yarn bobbin or package P rotates in the winding direction in each spinning unit 2. The traverse guide 143 of each spinning unit 2 is provided on a shaft (not shown) common to the multiple spinning units 2. By reciprocating the shaft in the direction of rotation of the winding drum 142 by the drive motor, the traverse guide 143 causes the yarn Y to traverse relative to the rotating yarn bobbin or package P by a predetermined amplitude.

[0041] When yarn Y is cut in spinning unit 2 or breaks for some reason, the yarn splicing carriage 3 travels to spinning unit 2 and performs a splicing operation. The yarn splicing carriage 3 has a splicing device 31, a suction tube 32, and a suction nozzle 33. The suction tube 32 is rotatably supported by a support shaft 34 and catches yarn Y from the air spinning device 9, guiding it to the splicing device 31. The suction nozzle 33 is rotatably supported by a support shaft 35 and catches yarn Y from the winding device 14, guiding it to the splicing device 31. The splicing device 31 splices the guided yarns Y together. The splicing device 31 can be a splicer using compressed air, a piercer using a reference yarn, or a knotter that mechanically connects the yarns Y, etc.

[0042] When the yarn receiving carriage 3 performs the yarn receiving action, the package P is rotated in the reverse winding direction (reverse rotation). At this time, the rocker arm 141 is moved by the cylinder (not shown) to separate the package P from the winding drum 142, and the package P is rotated in the reverse direction by the reverse rotation roller (not shown) provided on the yarn receiving carriage 3.

[0043] Next, the yarn monitoring device 10 of the first embodiment will be described in more detail.

[0044] Figure 2 This is a perspective view of the yarn monitoring device 10 in the spinning machine 1. Figure 3 This is an exploded perspective view of the yarn monitoring device 10. Figure 4 This is a schematic cross-sectional view of the upper yarn guide 65 (described later) and the lower yarn guide 66 (described later) installed on the yarn monitoring device 10. Figure 2 and Figure 3As shown, the yarn monitoring device 10 includes a housing 5, a yarn monitoring unit 6, a base plate 7, and a screw (first conductive component) 8. The yarn monitoring unit 6, the base plate 7, and the screw 8 are disposed within the housing 5. In this specification, "screw" may also be referred to as a bolt or screw. Screws, bolts, or screws are necessary auxiliary materials in the construction of the yarn monitoring device 10, etc.

[0045] The housing 5 can be divided in the vertical direction. The housing 5 has an upper housing (connecting portion, upstream connecting portion) 51 located on the upper side, and a lower housing (connecting portion, downstream connecting portion) 52 located on the lower side. The housing 5 is formed, for example, of a conductive resin. The upper housing 51 is in the assembled state of the housing 5 (…). Figure 2 In the state shown, it is in contact with the lower housing 52. The lower edge of the side wall of the upper housing 51 and the upper edge of the side wall of the lower housing 52 interlock and abut against each other. In addition, the upper housing 51 and the lower housing 52 can also be electrically connected by means of a conductive component other than the screw 8. The upper housing 51 and the lower housing 52 can also be electrically connected by means of a screw. The resistivity of the upper housing 51 is, for example, greater than or equal to the resistivity of the screw 8. The resistivity of the lower housing 52 is, for example, greater than or equal to the resistivity of the screw 8. It should be noted that "conductivity" can also be used as an indicator instead of resistivity in this specification. Conductivity is the reciprocal of resistivity. Furthermore, "electrical connection" refers to the ability of charge (described later) generated by the movement of the yarn Y to move.

[0046] The yarn monitoring unit 6 includes a first retainer 61, a second retainer 62, a first monitoring section 63, a second monitoring section 64, an upper yarn guide (yarn guide, upstream yarn guide) 65, and a lower yarn guide (yarn guide, downstream yarn guide) 66. These structures will be described separately.

[0047] The first retainer 61 is disposed upstream of the second retainer 62. The first retainer 61 includes a body 61a, for example, formed of resin. A travel space R1 for the yarn Y is provided on the body 61a of the first retainer 61. The travel space R1 is a space extending along the travel path of the yarn Y. The travel space R1 opens to the front. In other words, the travel space R1 is a space through which the traveling yarn Y passes, and is formed as a groove extending downstream from the upstream and opening to the front. Viewed from the travel direction of the yarn Y, the travel space R1 is U-shaped.

[0048] A first monitoring unit 63 is mounted on a first retainer 61. The first monitoring unit 63 monitors the state of the yarn Y traveling within the travel space R1. The first monitoring unit 63 has a foreign object detection function to detect foreign objects mixed into the traveling yarn Y. The first monitoring unit 63 includes, for example, two light-emitting elements (not shown) and two light-receiving elements (not shown). The two light-emitting elements and two light-receiving elements are mounted inside and supported by the main body 61a. When viewed from the direction of travel of the yarn Y, the two light-emitting elements and two light-receiving elements are arranged at different positions around the travel space R1. The two light-emitting elements and two light-receiving elements are configured such that the optical axes of each element are located on the same plane perpendicular to the direction of travel of the yarn Y. The first monitoring unit 63 projects light onto the yarn Y traveling within the travel space R1 from each light-emitting element, and receives the light reflected and / or transmitted from the yarn Y by the two light-receiving elements, thereby monitoring the state of the yarn Y. For example, LEDs (Light Emitting Diodes) can be used as light-emitting elements. As a light-receiving element, a photodiode can be used, for example.

[0049] The second retainer 62 is disposed downstream of the first retainer 61. The second retainer 62 includes a body 62a, for example, formed of resin. A travel space R2 for the yarn Y is provided on the body 62a of the second retainer 62. The travel space R2 is a space extending along the travel path of the yarn Y. The travel space R2 is continuous with the travel space R1. The travel space R2 opens to the front. In other words, the travel space R2 is a space through which the traveling yarn Y passes, and is formed as a groove extending downstream from upstream and opening to the front. Viewed from the travel direction of the yarn Y, the travel space R2 is U-shaped.

[0050] A second monitoring unit 64 is mounted on the second retainer 62. The second monitoring unit 64 monitors the state of the yarn Y traveling within the travel space R2. The second monitoring unit 64 has a yarn thickness detection function that detects the thickness of the traveling yarn Y. The second monitoring unit 64 includes, for example, a light-emitting element (not shown) and a light-receiving element (not shown). The light-emitting element and the light-receiving element are mounted inside and supported by the main body 62a. The light-emitting element and the light-receiving element are arranged opposite each other across the travel space R2. The second monitoring unit 64 projects light onto the yarn Y traveling within the travel space R2 from the light-emitting element, and the light transmitted through the yarn Y is received by the light-receiving element, thereby monitoring the state of the yarn Y. For example, an LED can be used as the light-emitting element. For example, a photodiode can be used as the light-receiving element.

[0051] The upper yarn guide 65 is provided on the first retainer 61 on the upstream side of the first retainer 61 in the yarn Y travel direction. In this embodiment, the upper yarn guide 65 is disposed between the first retainer 61 and the upper housing 51. The upper yarn guide 65 is, for example, one of the components forming the shape of the upstream side of the yarn monitoring device 10. The upper yarn guide 65 is, for example, a rectangular plate component with a groove (U-shaped groove) that extends through the thickness direction (the yarn Y travel direction) and opens forward. The upper yarn guide 65 has an upper static elimination section (static elimination section, upstream static elimination section) 65a including the groove. The side of the groove in the upper static elimination section 65a (equivalent to the plate thickness) is a guide surface 65b for guiding the yarn Y. That is, the upper static elimination section 65a has a guide surface 65b for guiding the yarn Y into the travel space R1. Figure 4 In the example, the guide surface 65b is in continuous contact with the yarn Y and restricts the travel path of the yarn Y. Thus, the guide surface 65b guides the traveling yarn Y into the travel space R1. The traveling yarn Y is pulled backward and pressed against the guide surface 65b, which serves as the bottom of the groove. This defines the position of the yarn Y.

[0052] The upper static eliminator 65a is made of, for example, a conductive material. The upper static eliminator 65a removes the charge generated by the movement of the yarn Y (the charge generated on the yarn Y). The entire upper yarn guide 65 may be the upper static eliminator 65a, or only a portion of the upper yarn guide 65 (the portion forming the guide surface 65b) may be the upper static eliminator 65a. The upper static eliminator 65a is located near the upper end (entrance) of the travel space R1, and is disposed close to the travel space R1. In this embodiment, the upper static eliminator 65a is part of the upper yarn guide 65 and is disposed at a position that contacts the traveling yarn Y. The material forming the upper static eliminator 65a is appropriately determined based on its compatibility with the material of the yarn Y and the travel speed of the yarn Y. The upper static eliminator 65a may be made of, for example, a metal such as stainless steel or copper, or a conductive resin or conductive ceramic. Furthermore, the upper static eliminator 65a can also be positioned where it does not contact the traveling yarn Y. That is, the upper static eliminator 65a can also be provided on a portion different from the guide surface 65b. In this case, the upper static eliminator 65a can be positioned close to a point where static electricity can be removed from the yarn Y. For example, it can face the yarn with a small gap between it and the yarn. The resistivity of the upper static eliminator 65a is, for example, greater than or equal to the resistivity of the upper housing 51. The resistivity of the upper static eliminator 65a is, for example, 1.0 × 10⁻⁶. 6 Ω〃m or less.

[0053] The lower yarn guide 66 is disposed on the second retainer 62 on the downstream side of the second retainer 62 in the yarn Y travel direction. In this embodiment, the lower yarn guide 66 is disposed between the second retainer 62 and the lower housing 52. The lower yarn guide 66 is, for example, one of the components forming the shape of the downstream side of the yarn monitoring device 10. The lower yarn guide 66 is, for example, a rectangular plate component having a groove (U-shaped groove) that extends through the thickness direction (the yarn Y travel direction) and opens forward. The lower yarn guide 66 has the same structure as the upper yarn guide 65, having a lower current-eliminating part (currently eliminating part, downstream current-eliminating part) 66a including the groove. The side of the groove in the lower current-eliminating part 66a (equivalent to the plate thickness) is a guide surface 66b for guiding the yarn Y. That is, the lower current-eliminating part 66a has a guide surface 66b for guiding the yarn Y from the travel space R2 to the outside of the yarn monitoring device 10. Figure 4 In the example, the guide surface 66b continuously contacts the yarn Y and restricts the travel path of the yarn Y. Thus, the guide surface 66b guides the traveling yarn Y from the travel space R2 to the outside of the yarn monitoring device 10. The traveling yarn Y is pulled backward and pressed against the guide surface 66b, which serves as the bottom of the groove. This defines the position of the yarn Y. The lower yarn guide 66 is configured with its upstream and downstream sides flipped relative to the upper yarn guide 65. That is, the upper yarn guide 65 and the lower yarn guide 66 are oriented opposite to each other in the vertical direction.

[0054] The lower charge-eliminating section 66a is made of, for example, a conductive material. The lower charge-eliminating section 66a removes the charge generated by the movement of the yarn Y. The entire lower yarn guide 66 may be the lower charge-eliminating section 66a, or only a portion of the lower yarn guide 66 (the portion forming the guide surface 66b) may be the lower charge-eliminating section 66a. The lower charge-eliminating section 66a is located near the lower end (exit) of the travel space R2 and is disposed close to the travel space R2. In this embodiment, the lower charge-eliminating section 66a is part of the lower yarn guide 66 and is disposed at a position that contacts the traveling yarn Y. The material forming the lower charge-eliminating section 66a is appropriately determined based on its compatibility with the material of the yarn Y and the travel speed of the yarn Y. The lower charge-eliminating section 66a may be made of, for example, a metal such as stainless steel or copper, or a conductive resin or conductive ceramic. Alternatively, the lower charge-eliminating section 66a may be disposed at a position that does not contact the traveling yarn Y. In other words, the lower static eliminator 66a can also be provided in a portion different from the guide surface 66b. In this case, the lower static eliminator 66a can be positioned close to a point where static electricity can be removed from the yarn Y. For example, it can face the yarn with a small gap between it and the yarn. The resistivity of the lower static eliminator 66a is, for example, greater than or equal to the resistivity of the lower housing 52. The resistivity of the lower static eliminator 66a is, for example, 1.0 × 10⁻⁶. 6 Ω〃m or less.

[0055] The substrate 7 transmits the information acquired by the first monitoring unit 63 and the second monitoring unit 64 to the outside of the yarn monitoring device 10. The substrate 7 extends inside the housing 5 on a plane orthogonal to the direction of travel of the yarn Y. The substrate 7 is in contact with the screw 8 and the structure C.

[0056] The upper voltage-eliminating part 65a is electrically connected to ground potential, for example. In this embodiment, the upper voltage-eliminating part 65a contacts and is electrically connected to the upper housing 51. The upper housing 51 is electrically connected to ground potential. Specifically, the upper housing 51, which contacts the upper voltage-eliminating part 65a, contacts and is electrically connected to the lower housing 52. Moreover, the lower housing 52 is electrically connected to the substrate 7 via screw 8 (see reference). Figure 3 The substrate 7 is electrically connected to the ground potential via the structure C. That is, the upper charge-eliminating part 65a is electrically connected to the outside of the yarn monitoring device 10. As a result, the charge removed from the yarn Y by the upper charge-eliminating part 65a is guided to the outside of the yarn monitoring device 10.

[0057] Furthermore, by making the potential of the substrate 7 the same as the potentials of the upper housing 51 and the lower housing 52, the influence of external electromagnetic waves can be reduced. Additionally, since the upper voltage-eliminating part 65a can be electrically connected to the ground potential, it can also be connected to the ground potential (ground wire) via a path other than those described above. In this specification, "ground potential" can be expressed as frame ground (FG) or simply ground (GND).

[0058] The lower charge-eliminating part 66a is electrically connected to the ground potential, for example. In this embodiment, the lower charge-eliminating part 66a contacts and is electrically connected to the lower housing 52. The lower housing 52 is electrically connected to the ground potential. Specifically, the lower housing 52, which contacts the lower charge-eliminating part 66a, is electrically connected to the substrate 7 via a screw 8. Moreover, the substrate 7 is electrically connected to the ground potential via a structure C. That is, the lower charge-eliminating part 66a is electrically connected to the outside of the yarn monitoring device 10. Thus, the charge removed from the yarn Y by the lower charge-eliminating part 66a is guided to the outside of the yarn monitoring device 10. Furthermore, since the lower charge-eliminating part 66a only needs to be electrically connected to the ground potential, the lower charge-eliminating part 66a can also be connected to the ground potential (ground wire) via a path other than that described above. In addition, since both the upper housing 51 and the lower housing 52 only need to be connected to the ground potential, it is possible that only the upper housing 51 is electrically connected to the substrate 7 via the screw 8, or both the upper housing 51 and the lower housing 52 are electrically connected to the substrate 7.

[0059] The yarn monitoring device 10 includes a yarn monitoring unit 6 with an upper yarn guide 65 and a lower yarn guide 66. The upper excitation unit 65a of the upper yarn guide 65 is disposed close to the travel space R1 and excites the yarn Y to eliminate charge generated during its travel. The lower excitation unit 66a of the lower yarn guide 66 is disposed close to the travel space R2 and excites the yarn Y to eliminate charge generated during its travel. The upper excitation unit 65a is electrically connected to the upper housing 51. The lower excitation unit 66a is electrically connected to the lower housing 52.

[0060] Therefore, static electricity generated on yarn Y, the upper yarn guide 65, and the lower yarn guide 66 is guided to the upper housing 51 and the lower housing 52 via the upper static eliminator 65a or the lower static eliminator 66a. This removes static electricity from the yarn monitoring device 10. As a result, the effects of static electricity can be suppressed in the yarn monitoring device 10. Furthermore, since the resistivity of the upper static eliminator 65a and the lower static eliminator 66a is greater than the resistivity of the upper housing 51 and the lower housing 52, static electricity is more effectively guided from the upper static eliminator 65a and the lower static eliminator 66a to the upper housing 51 and the lower housing 52. As a result, the effects of static electricity can be more effectively suppressed in the yarn monitoring device 10.

[0061] Furthermore, the yarn monitoring device 10 can reduce the incidence of operational errors and breakage. Therefore, the spinning machine 1 can suppress the decrease in yarn production caused by increased downtime in yarn production. Moreover, since the yarn monitoring device 10 can suppress detection errors in the first monitoring unit 63 and the second monitoring unit 64, which serve as yarn quality sensors, it can suppress both the decrease in yarn production and the decrease in yarn quality in the spinning machine 1.

[0062] In the yarn monitoring device 10, the upper static eliminator 65a is provided on the upper yarn guide 65 upstream of the first holder 61 and the second holder 62 in the yarn Y traveling direction. This allows static electricity to be removed from the yarn Y before it travels within the travel space R1. As a result, the effects of static electricity can be suppressed in the yarn monitoring device 10.

[0063] In the yarn monitoring device 10, the lower static eliminator 66a is provided on the lower yarn guide 66 on the downstream side of the first holder 61 and the second holder 62 in the yarn Y traveling direction. This removes static electricity from the yarn Y traveling from the travel space R2 towards the outside of the yarn monitoring device 10. As a result, the effects of static electricity can be suppressed in the spinning machine 1 equipped with the yarn monitoring device 10. Furthermore, the charging of the lower housing 52 can be suppressed. This suppresses fly accumulation and prevents a decrease in the measurement accuracy of the light received by the light-receiving elements in the first monitoring unit 63 and the second monitoring unit 64. Consequently, detection errors in the first monitoring unit 63 and the second monitoring unit 64 can be suppressed, thus preventing a decrease in yarn production and yarn quality in the spinning machine 1.

[0064] In the yarn monitoring device 10, the upper housing 51 and the lower housing 52 are electrically connected to the ground potential. The upper housing 51 and the lower housing 52 are electrically connected to the ground potential, for example, via a base plate 7 and a screw 8. As a result, static electricity is removed from the upper housing 51, which is electrically connected to the upper static elimination section 65a, and the lower housing 52, which is electrically connected to the lower static elimination section 66a, thus suppressing the effects of static electricity in the yarn monitoring device 10.

[0065] In the yarn monitoring device 10, the upper housing 51 is in contact with the upper static eliminator 65a, and the lower housing 52 is in contact with the lower static eliminator 66a. The upper housing 51 and the lower housing 52 are in contact. The lower housing 52 is electrically connected to the substrate 7 via a screw 8. As a result, static electricity is removed from the upper static eliminator 65a and the lower static eliminator 66a, thus suppressing the effects of static electricity in the yarn monitoring device 10.

[0066] In the yarn monitoring device 10, the resistivity of the upper housing 51 and the lower housing 52 is greater than that of the screw 8. As a result, charge diffuses more easily within the upper housing 51 and the lower housing 52, and static electricity is more effectively guided from the upper housing 51 and the lower housing 52 to the substrate 7 via the screw 8. Consequently, the effects of static electricity can be more effectively suppressed in the yarn monitoring device 10.

[0067] In the yarn monitoring device 10, the upper static eliminator 65a and the lower static eliminator 66a are made of conductive material. The upper static eliminator 65a has a guide surface 65b that guides the yarn into the travel space R1. The lower static eliminator 66a has a guide surface 66b that guides the yarn from the travel space R2 to the outside of the yarn monitoring device 10. Therefore, since the upper static eliminator 65a and the lower static eliminator 66a, made of conductive material, are in direct contact with the yarn Y, static electricity is more effectively guided to the upper housing 51 and the lower housing 52 via the upper static eliminator 65a and the lower static eliminator 66a. As a result, the effects of static electricity can be more effectively suppressed in the yarn monitoring device 10. Static electricity refers, for example, to frictional charging and stripping charging between the upper static eliminator 65a and the lower static eliminator 66a and the yarn Y.

[0068] The resistivity of the upper current-eliminating section 65a and the lower current-eliminating section 66a is 1.0 × 10⁻⁶. 6 Below Ω〃m. As a result, static electricity generated on yarn Y is more effectively removed by the upper static eliminator 65a and the lower static eliminator 66a.

[0069] In the yarn monitoring device 10, the upper static eliminator 65a and the lower static eliminator 66a can also be formed of conductive resin or conductive ceramic. As a result, static electricity is more effectively guided to the upper housing 51 and the lower housing 52 via the upper static eliminator 65a and the lower static eliminator 66a. Consequently, the effects of static electricity can be more effectively suppressed in the yarn monitoring device 10.

[0070] In the yarn monitoring device 10, the upper yarn guide 65 and the lower yarn guide 66 form the shape of the yarn monitoring device 10. This increases the separation distance between the upper yarn guide 65 and the lower yarn guide 66. As a result, the maximum time from when yarn Y contacts the upper yarn guide 65 to when yarn Y contacts the lower yarn guide 66 can be ensured. Since contact between yarn Y and the upper and lower yarn guides 65 and 66 is prevented within a short time, a decrease in yarn quality can be suppressed.

[0071] [Second Implementation]

[0072] The yarn monitoring device 110 of the second embodiment will be described in detail. The yarn monitoring device 110 may also be used in place of the yarn monitoring device 10 in the spinning machine 1 of the first embodiment. Figure 5 This is an exploded perspective view of the yarn monitoring device 110. Figure 6 It is an exploded perspective view of the yarn monitoring device 110 from another viewpoint. Figure 7 This is a top view of the yarn monitoring device 110. Figure 7 The illustration of top plate 151 (described later) is omitted. Figure 5 , Figure 6 and Figure 7As shown, the yarn monitoring device 110 includes a housing 105, a yarn monitoring unit 106, and a substrate 107. The yarn monitoring unit 106 and the substrate 107 are disposed within the housing 105.

[0073] The housing 105 includes a main body 153, a top plate (connecting part, upstream connecting part) 151, and a bottom plate (connecting part, downstream connecting part) 152. The housing 105 also includes a screw 154a (second conductive component) and three other screws 154b to 154d (see reference). Figure 7 ).

[0074] like Figure 5 As shown, the main body 153 is a bottomed cylindrical component that is open at the top. The cylindrical portion 153b (first conductive member) of the main body 153 extends along the yarn Y travel direction and surrounds the yarn monitoring unit 106. A cutout 153e corresponding to the travel space R3 (described later) is formed on the main body 153. The main body 153 includes a bottom 153c that is provided to block the opening of the cylindrical portion 153b located downstream of the yarn Y travel direction. The main body 153 is formed, for example, of a conductive resin. A plurality of holes 153a are formed on the main body 153. The main body 153 includes a support portion 153d (first conductive member) that contacts the cylindrical portion 153b. The support portion 153d supports the substrate 107.

[0075] A top plate 151 is provided on the main body 153 to block the opening of the main body 153. The top plate 151 is, for example, a plate-shaped member extending in a direction orthogonal to the yarn travel direction Y. The top plate 151 fixes the upper yarn guide 165 relative to the retainer 161. The top plate 151 is opposite to the bottom 153c of the main body 153 in the yarn travel direction Y. The top plate 151 is made of a conductive material, such as metal. The resistivity of the top plate 151 is, for example, greater than or equal to the resistivity of the screw 107a (described later). An opening 155 and a plurality of circular holes 156 are formed on the top plate 151. A portion of the upper yarn guide 165 (the upper part of the upper current-eliminating part 165a described later) is embedded in the opening 155. Each circular hole 156 is located at a position corresponding to each hole 153a in the main body 153. The top plate 151 is fixed relative to the main body 153 by screwing four screws 154a to 154d into each of the round holes 156 and each of the holes 153a in the main body 153. That is, the top plate 151 is in contact with the screws 154a to 154d.

[0076] The base plate 152 is located in the main body 153 at the bottom 153c on the downstream side of the yarn Y travel direction. The bottom 153c is located between the base plate 152 and the yarn monitoring unit 106. The base plate 152 is opposite to the top plate 151 in the yarn Y travel direction. The base plate 152 is, for example, a plate-shaped member extending in a direction orthogonal to the yarn Y travel direction. The base plate 152 is made of a conductive material, such as metal. The resistivity of the base plate 152 is greater than that of the screw 107a (described later). The base plate 152 is electrically connected to the screw 154a, for example, in contact with the screw 154a.

[0077] like Figure 5 and Figure 6 As shown, the yarn monitoring unit 106 includes a retainer 161, a monitoring section 163, an upper yarn guide (yarn guide, upstream yarn guide) 165, and a lower yarn guide (yarn guide, downstream yarn guide) 166. The yarn monitoring unit 106 is disposed between the top plate 151 and the bottom plate 152.

[0078] The main body 161a of the retainer 161 is provided with a travel space R3 for the yarn Y to travel. The travel space R3 is a space extending along the travel direction of the yarn Y. The travel space R3 opens to one side (front side) in the front-rear direction. In other words, the travel space R3 is a space for the traveling yarn Y to pass through, and is formed as a groove extending from upstream to downstream and opening to the front side. Viewed from the travel direction of the yarn Y, the travel space R3 is U-shaped. Alternatively, viewed from the travel direction of the yarn Y, the travel space R3 may be V-shaped.

[0079] A monitoring unit 163 is mounted on the main body 161a of the retainer 161. The monitoring unit 163 monitors the state of the yarn Y traveling within the travel space R3. The monitoring unit 163 includes, for example, a light-emitting element (not shown) and a light-receiving element (not shown). The light-emitting element and the light-receiving element are mounted inside the retainer 161 and supported by the main body 161a. The monitoring unit 163 projects light onto the yarn Y traveling within the travel space R3 from the light-emitting element, and receives the light reflected and / or transmitted from the yarn Y by the light-receiving element, thereby monitoring the state of the yarn Y. For example, an LED can be used as the light-emitting element. For example, a photodiode can be used as the light-receiving element.

[0080] The upper yarn guide 165 is provided on the retainer 161 on the upstream side of the retainer 161 in the yarn travel direction. In this embodiment, the upper yarn guide 165 is disposed between the retainer 161 and the top plate 151. The upper yarn guide 165 is, for example, a rectangular plate member having a groove (V-shaped groove) that extends through the thickness direction (the travel direction of the yarn Y) and opens forward. The upper yarn guide 165 has an upper static elimination section (static elimination section, upstream static elimination section) 165a including the groove. The side of the groove in the upper static elimination section 165a (corresponding to the plate thickness) is a guide surface 165b for guiding the yarn Y. That is, the upper static elimination section 165a has a guide surface 165b for guiding the yarn Y into the travel space R3. Figure 4 In the example, guide surface 165b, like guide surface 65b, continuously contacts yarn Y and restricts the travel path of yarn Y. Thus, guide surface 165b guides the traveling yarn Y into the travel space R3. The traveling yarn Y is pulled backward and pressed against guide surface 165b, which serves as the bottom of the groove. This defines the position of yarn Y. Alternatively, the groove formed on the upper yarn guide 165 can be U-shaped when viewed from the direction of yarn Y's travel.

[0081] The upper static eliminator 165a is made of, for example, a conductive material. The entire upper yarn guide 165 may be the upper static eliminator 165a, or only a portion of the upper yarn guide 165 (the portion forming the guide surface 165b) may be the upper static eliminator 165a. The upper static eliminator 165a is located near the upper end (entrance) of the travel space R3 and is disposed close to the travel space R3. In this embodiment, the upper static eliminator 165a is a part of the upper yarn guide 165 and is disposed at a position that contacts the traveling yarn Y. The material forming the upper static eliminator 165a is appropriately determined based on its compatibility with the material of the yarn Y and the travel speed of the yarn Y. The upper static eliminator 165a may be formed of, for example, a metal such as stainless steel or copper, or a conductive resin or conductive ceramic. The resistivity of the upper static eliminator 165a is, for example, higher than the resistivity of the top plate 151. The resistivity of the upper 165a non-electrically removed section is, for example, 1.0 × 10⁻⁶. 6 Below Ω〃m. Furthermore, the upper static eliminator 165a can also be positioned where it does not contact the traveling yarn Y. That is, the upper static eliminator 165a can also be provided on a portion different from the guide surface 165b. In this case, the upper static eliminator 165a can be positioned close to a point where static electricity can be removed from the yarn Y, for example, facing the yarn with a small gap between it and the yarn.

[0082] The lower yarn guide 166 is disposed on the retainer 161 on the downstream side of the retainer 161 in the yarn Y travel direction. In this embodiment, the lower yarn guide 166 is disposed between the retainer 161 and the base plate 152. The lower yarn guide 166 is, for example, a rectangular plate member having a groove (V-shaped groove) that extends through the thickness direction (the yarn Y travel direction) and opens forward. The lower yarn guide 166 has the same structure as the upper yarn guide 165, having a lower current-eliminating section (currently eliminating section, downstream current-eliminating section) 166a including the groove. The side of the groove in the lower current-eliminating section 166a (corresponding to the plate thickness) is a guide surface 166b for guiding the yarn Y. That is, the lower current-eliminating section 166a has a guide surface 166b for guiding the yarn Y from the travel space R3 to the outside of the yarn monitoring device 110. Figure 4 In the example, guide surface 166b, like guide surface 66b, continuously contacts yarn Y and restricts the travel path of yarn Y. Thus, guide surface 166b guides the traveling yarn Y from the travel space R3 to the outside of yarn monitoring device 110. The traveling yarn Y is pulled backward and pressed against guide surface 166b, which serves as the bottom of the groove. This defines the position of yarn Y. Alternatively, the groove formed on the lower yarn guide 166 may be U-shaped when viewed from the direction of yarn Y's travel. The lower yarn guide 166 is configured with its upstream and downstream sides flipped relative to the upper yarn guide 165. That is, the upper yarn guide 165 and the lower yarn guide 166 are oriented opposite to each other in the vertical direction.

[0083] The lower current-eliminating section 166a is made of, for example, a conductive material. The entire lower yarn guide 166 may be the lower current-eliminating section 166a, or only a portion of the lower yarn guide 166 (the portion forming the guide surface 166b) may be the lower current-eliminating section 166a. The lower current-eliminating section 166a is located near the lower end (exit) of the travel space R3 and is disposed close to the travel space R3. In this embodiment, the lower current-eliminating section 166a is part of the lower yarn guide 166 and is disposed at a position that contacts the traveling yarn Y. The material forming the lower current-eliminating section 166a is appropriately determined based on its compatibility with the material of the yarn Y and the travel speed of the yarn Y. The lower current-eliminating section 166a may be formed of, for example, a metal such as stainless steel or copper, or a conductive resin or conductive ceramic. The resistivity of the lower current-eliminating section 166a is greater than or equal to the resistivity of the base plate 152. The resistivity of the lower current-eliminating section 166a is, for example, 1.0 × 10⁻⁶. 6 Below Ω〃m. Furthermore, the lower static eliminator 166a can also be positioned where it does not contact the traveling yarn Y. That is, the lower static eliminator 166a can also be provided on a portion different from the guide surface 166b. In this case, the lower static eliminator 166a can be positioned close to a point where static electricity can be removed from the yarn Y, for example, facing the yarn with a small gap between it and the yarn.

[0084] The substrate 107 transmits the information acquired by the monitoring unit 163 to the outside of the yarn monitoring device 110. The substrate 107 is disposed inside the housing 105. The substrate 107 extends within the housing 105 on a plane orthogonal to the yarn Y-direction of travel. A hole is formed in the substrate 107. The substrate 107 is fixed to the support 153d by screwing a screw 107a (first conductive member) into the hole.

[0085] The upper charge-eliminating part 165a is electrically connected to the ground potential, for example. In this embodiment, the upper charge-eliminating part 165a contacts and is electrically connected to the top plate 151. The top plate 151 is electrically connected to the base plate 107 via screws 107a. The base plate 107 is electrically connected to the ground potential. The upper charge-eliminating part 165a is electrically connected to the outside of the yarn monitoring device 110. Thus, the charge removed from the yarn Y by the upper charge-eliminating part 165a is guided to the outside of the yarn monitoring device 110. Furthermore, since the upper charge-eliminating part 165a can be electrically connected to the ground potential, it can also be connected to the ground potential (ground wire) via a path other than those described above.

[0086] The lower charge-eliminating section 166a is electrically connected to the ground potential, for example. In this embodiment, the lower charge-eliminating section 166a contacts and is electrically connected to the base plate 152. The base plate 152 is electrically connected to the top plate 151 via screws 154a. The top plate 151 is electrically connected to the ground potential as described above. That is, the lower charge-eliminating section 166a is electrically connected to the outside of the yarn monitoring device 110. Thus, the charge removed from the yarn Y by the lower charge-eliminating section 166a is guided to the outside of the yarn monitoring device 110. Furthermore, since the lower charge-eliminating section 166a only needs to be electrically connected to the ground potential, the lower charge-eliminating section 166a can also be connected to the ground potential (ground wire) via a path other than that described above. In addition, since the top plate 151 and the base plate 152 only need to be electrically connected to the ground potential, the base plate 152 can also be electrically connected to the substrate 107 via the main body 153 and screws 154a, etc.

[0087] In the yarn monitoring device 110, the upper static eliminator 165a is electrically connected to the top plate 151. The lower static eliminator 166a contacts and is electrically connected to the bottom plate 152. The bottom plate 152 is electrically connected to the top plate 151 via screw 154a. The top plate 151 is electrically connected to the base plate 107 via the support portion 153d and screw 107a. The base plate 107 is electrically connected to the outside of the yarn monitoring device 110 and to ground potential. Thus, static electricity is removed from the yarn monitoring device 110, thereby suppressing the effects of static electricity in the yarn monitoring device 110.

[0088] Furthermore, the yarn monitoring device 110 of the second embodiment, like the yarn monitoring device 10 of the first embodiment, includes a yarn monitoring unit 106 having an upper yarn guide 165 and a lower yarn guide 166. The upper static eliminator 165a included in the upper yarn guide 165 and the lower static eliminator 166a included in the lower yarn guide 166 are disposed close to the travel space R3. The upper static eliminator 165a is electrically connected to the top plate 151. The lower static eliminator 166a is electrically connected to the bottom plate 152.

[0089] Therefore, static electricity generated on yarn Y, the upper yarn guide 165, and the lower yarn guide 166 is guided to the top plate 151 and the bottom plate 152 via the upper or lower static eliminator 165a or lower static eliminator 166a. This removes static electricity from the yarn monitoring device 110. As a result, the effects of static electricity can be suppressed in the yarn monitoring device 110. Furthermore, since the resistivity of the upper and lower static eliminators 165a and 166a is greater than that of the top plate 151 and the bottom plate 152, static electricity is more effectively guided from the upper and lower static eliminators 165a and 166a to the top plate 151 and the bottom plate 152. As a result, the effects of static electricity can be more effectively suppressed in the yarn monitoring device 110. Additionally, the incidence of operational errors and breakage can be reduced in the yarn monitoring device 110. Therefore, the time of yarn travel stoppage can be suppressed in the device equipped with the yarn monitoring device 110. Furthermore, the yarn monitoring device 110 can suppress detection errors in the monitoring unit 163, which serves as a yarn quality sensor. Additionally, the yarn monitoring device 110 of the second embodiment exhibits the same other effects as the yarn monitoring device 10 of the first embodiment.

[0090] [Variation Example]

[0091] The present invention has been described above as one embodiment, but the present invention is not limited to the above embodiment. Various modifications can be made without departing from the spirit of the invention.

[0092] In the above embodiment, the upper static-eliminating parts 65a and 165a and the lower static-eliminating parts 66a and 166a, which are static-eliminating units, are respectively part of the upper yarn guide members 65 and 165 and the lower yarn guide members 66 and 166, and the static-eliminating parts are arranged in contact with the traveling yarn Y. However, in each yarn guide member, the static-eliminating part can be arranged at a position close to the point where static electricity can be removed from the yarn Y.

[0093] Figure 8This is a diagram showing a modified example of the yarn guide 90. The yarn guide 90 can also be used in the yarn monitoring devices 10 and 110 in place of the upper yarn guides 65 and 165 and the lower yarn guides 66 and 166 in the above embodiments. In this modified example, the yarn guide 90 has a guide body 91 and an anti-static element 92 mounted on the guide body 91.

[0094] The guide body 91 includes a guide surface 91a for guiding the yarn Y. The guide body 91 has, for example, a V-shaped groove 91b formed on a rectangular plate-like component. The groove 91b is defined by the guide surface 91a. The guide body 91 is, for example, made of ceramic. The static eliminator 92 is, for example, made of a conductive material. The material forming the static eliminator 92 is appropriately determined based on its compatibility with the material of the yarn Y and the travel speed of the yarn Y. The static eliminator 92 can be formed, for example, of metals such as stainless steel or copper, or of conductive resin or conductive ceramic. The static eliminator 92 includes a static eliminator portion 92a disposed along the groove 91b of the guide body 91. The static eliminator portion 92a is disposed on the guide body 91 in a manner close to the guide surface 91a. Specifically, the static eliminator portion 92a is disposed close to the bottom 91c of the groove 91b. Figure 8 In the example, the electric current eliminating body 92 has a V-shaped groove 92b formed by the electric current eliminating part 92a. The electric current eliminating part 92a of the electric current eliminating body 92 is arranged on the guide body 91 with the groove 92b along the groove 91b.

[0095] Furthermore, even when the static-generating guiding surface 91a is separated from the static-eliminating part 92a, static electricity will still flow from the guiding surface 91a to the static-eliminating part 92a. Additionally, the static-eliminating part 92a can also be formed by plating the guiding body 91. Furthermore, in Figure 8 In this configuration, the distance L between the static-eliminating part 92a and the bottom 91c is a few millimeters. For example, the distance L can be 0.7 mm or 0.4 mm. Alternatively, the distance L can be 0 mm. That is, the bottom 91c can overlap with the static-eliminating part 92a when the yarn guide 90 is viewed from the yarn travel direction Y.

[0096] According to the above structure, since static electricity is guided from the guide surface 91a to the static eliminator 92a via the static eliminator 92a, static electricity can be removed from the guide surface 91a. As a result, the effects of static electricity can be suppressed in the yarn monitoring devices 10 and 110. In addition, by installing the static eliminator 92 on the guide body 91, static electricity can be removed from the guide surface 91a without changing the structure of the guide body 91. For example, by simply using an existing guide body 91 made of an insulating material that does not have static electricity removal function and installing (adding) the static eliminator 92, static electricity removal function can be given to the yarn monitoring devices 10 and 110. In addition, for example, the guide body 91 can be made of an existing abrasion-resistant material and static electricity can be removed at the same time. In addition, even if the yarn moves forward, backward, left, and right in the groove 91b during its travel, static electricity can be removed. Figure 8 When the device moves (up, down, left, right) along the groove 91b, by providing the static electricity removal part 92a along the groove 91b, the static current can be directed to the static electricity removal part 92a regardless of where static electricity is generated in the groove 91b.

[0097] In the above structure, it is also possible not to form a groove 92b on the electric stripper 92. Figure 9 This is a diagram showing a modified example of the yarn guide 90. Figure 9 In the example, the current-eliminating portion 92a of the current-eliminating body 92 extends linearly along the edge 91d (on which a V-shaped groove 91b opening is formed). The current-eliminating portion 92a is disposed on the guide body 91 in the direction extending along the groove 91b. Furthermore, in Figure 9 In this configuration, the distance L between the static-eliminating part 92a and the bottom 91c is a few millimeters. For example, the distance L can be 0.7 mm or 0.4 mm. Alternatively, the distance L can be 0 mm. That is, the bottom 91c can overlap with the static-eliminating part 92a when the yarn guide 90 is viewed from the yarn travel direction Y.

[0098] In the first embodiment, the second embodiment, and the modified examples described above, the upper yarn guides 65 and 165 and the lower yarn guides 66 and 166, the guide surfaces 65b, 66b, 165b, and 166b are in continuous contact with the yarn Y, but this is not a limitation. (See also...) Figures 10A to 10C The combination of the upper yarn guide and the lower yarn guide in the modified example will be explained.

[0099] Figure 10A This is a cross-sectional view showing the upper yarn guide 65A and the lower yarn guide 66A of the first modified example. (See figure) Figure 10AAs shown, the upper yarn guide 65A and the lower yarn guide 66A have the same shape and are arranged in the same orientation relative to the yarn Y to be guided. The upper yarn guide 65A includes a leading edge 65f that guides the traveling yarn Y, and an upstream inclined surface 65d (inclined surface) extending upstream of the leading edge 65f in the traveling direction. The upstream inclined surface 65d is formed by an R surface. The upstream inclined surface 65d is connected to the leading edge 65f and is inclined away from the traveling space R1. In addition, the upstream inclined surface 65d may not be a straight shape. In the upper yarn guide 65A, the leading edge 65f protruding towards the traveling space R1 contacts the yarn Y, but the upstream inclined surface 65d is recessed relative to the traveling space R1 than the leading edge 65f and does not contact the yarn Y. The lower yarn guide 66A also includes a leading edge 66f that guides the traveling yarn Y, and an upstream inclined surface 66d (inclined surface) extending upstream of the leading edge 66f in the traveling direction. The upstream inclined surface 66d is connected to the leading edge 66f and is inclined away from the traveling space R2. Similarly, in the lower yarn guide 66A, the leading edge 66f protruding towards the traveling space R2 contacts the yarn Y, but the upstream inclined surface 66d is recessed relative to the traveling space R2 compared to the leading edge 66f and does not contact the yarn Y. The leading edges 65f of the upper yarn guide 65A and the leading edges 66f of the lower yarn guide 66A are arranged on a straight line (yarn path) along the traveling direction of the yarn Y. When yarn Y passes through the upper yarn guide 65A and the lower yarn guide 66A, it only contacts the upper yarn guide 65A and the lower yarn guide 66A at its downstream ends (front edge 65f and front edge 66f) in the thickness direction of each yarn guide.

[0100] Figure 10B This is a cross-sectional view showing the upper yarn guide 65B and the lower yarn guide 66B in the second modified example. (See figure) Figure 10BAs shown, the upper yarn guide 65B and the lower yarn guide 66B have the same shape relative to the yarn Y to be guided, but are arranged in opposite directions in the direction of yarn Y's travel. The structure of the upper yarn guide 65B is the same as that of the upper yarn guide 65A and is therefore omitted from description. The lower yarn guide 66B includes a leading edge 66f that guides the traveling yarn Y, and a downstream inclined surface 66e (inclined surface) extending downstream of the leading edge 66f in the direction of travel. The downstream inclined surface 66e is connected to the leading edge 66f and is inclined away from the travel space R2. In the lower yarn guide 66B, the leading edge 66f, protruding towards the travel space R2, contacts the yarn Y, but the downstream inclined surface 66e is recessed relative to the travel space R2 compared to the leading edge 66f and does not contact the yarn Y. The leading edge 65f of the upper yarn guide 65B and the leading edge 66f of the lower yarn guide 66B are arranged on a straight line (yarn path) along the traveling direction of yarn Y. When yarn Y passes through the upper yarn guide 65B, it only contacts the upper yarn guide 65B at its downstream end (leading edge 65f) in the thickness direction, and only contacts the lower yarn guide 66B at its upstream end (leading edge 66f) in the thickness direction.

[0101] Figure 10C This is a cross-sectional view showing the upper yarn guide 65C and the lower yarn guide 66C in the third modified example. (See figure) Figure 10C As shown, the upper yarn guide 65C and the lower yarn guide 66C have the same shape and are arranged in the same orientation relative to the yarn Y to be guided. The upper yarn guide 65C includes a leading edge 65f that guides the traveling yarn Y, and an upstream inclined surface 65d and a downstream inclined surface 65e extending upstream and downstream respectively in the traveling direction of the leading edge 65f. The inclination angles of the upstream inclined surface 65d and the downstream inclined surface 65e (inclination surfaces) can be the same as or different from the inclination angles of the upstream inclined surface 65d and the downstream inclined surface 65e in the first and second modifications described above. Figure 10CIn the example, the upstream inclined surface 65d and the downstream inclined surface 65e are inclined at a greater angle relative to the direction of travel of the yarn Y compared to the upstream inclined surface 65d and the downstream inclined surface 65e in the first and second modifications. In the upper yarn guide 65C, the front edge 65f protruding toward the travel space R1 contacts the yarn Y, but the upstream inclined surface 65d and the downstream inclined surface 65e are recessed relative to the travel space R1 than the front edge 65f and do not contact the yarn Y. The lower yarn guide 66C also includes a front edge 66f that guides the traveling yarn Y, and an upstream inclined surface 66d and a downstream inclined surface 66e extending toward the upstream and downstream sides of the front edge 66f in the direction of travel, respectively. The inclination angles of the upstream inclined surface 66d and the downstream inclined surface 66e are said to be the same as those of the upstream inclined surface 65d and the downstream inclined surface 65e of the upper yarn guide 65C. Similarly, in the lower yarn guide 66C, the leading edge 66f protruding towards the travel space R2 contacts the yarn Y, but the upstream inclined surface 66d and the downstream inclined surface 66e are recessed relative to the travel space R2 compared to the leading edge 66f and do not contact the yarn Y. The leading edges 65f of the upper yarn guide 65C and the leading edges 66f of the lower yarn guide 66C are arranged on a straight line (yarn path) along the travel direction of the yarn Y. When the yarn Y passes through the upper yarn guide 65C and the lower yarn guide 66C, it only contacts the upper yarn guide 65C and the lower yarn guide 66C at the central part (leading edge 65f and leading edge 66f) in the thickness direction of each yarn guide.

[0102] In the above structures, the upper yarn guides 65A, 65B, 65C and the lower yarn guides 66A, 66B, 66C guide the yarn Y at the two points of the front edge 65f and the front edge 66f, respectively. For example, compared with the case where the yarn Y is guided by the guide surfaces 65b, 165b, 66b, 166b, since the contact area between the yarn Y and the upper yarn guides 65 and the lower yarn guides 66 is reduced, static electricity generation can be suppressed on the yarn Y, the upper yarn guides 65A, 65B, 65C and the lower yarn guides 66A, 66B, 66C.

[0103] In the first embodiment, second embodiment, and variations described above, the structural element or feature described as "~ or more" regarding the resistivity relationship of each static-eliminating part, each connecting part, and each conductive component can be replaced with a structural element or feature such as "greater than~". Alternatively, the resistivity of at least one static-eliminating part may be greater than the resistivity of at least one electrically connected connecting part (as opposed to the comparison object). Similarly, the resistivity of at least one connecting part may be greater than the resistivity of at least one electrically connected conductive component (as opposed to the comparison object). Because of the difference in resistivity, the ease of charge diffusion is improved, resulting in an enhanced effect on removing static electricity from the yarn.

[0104] In the second embodiment described above, the top plate 151 is the upstream component in the direction of yarn Y travel, and the bottom plate 152 is the downstream component in the direction of yarn Y travel, but this is not a limitation. For example, the top plate 151 may also be located downstream of the upper yarn guide 165 in the direction of yarn Y travel. Conversely, the bottom plate 152 may be located upstream of the lower yarn guide 166 in the direction of yarn Y travel.

[0105] In the second embodiment described above, the cylindrical portion 153b and the support portion 153d may also be conductive components. The resistivity of the top plate 151 may, for example, be greater than or equal to the resistivity of the cylindrical portion 153b and the support portion 153d. The resistivity of the bottom plate 152 may, for example, be greater than or equal to the resistivity of the cylindrical portion 153b and the support portion 153d. In this case, the top plate 151 may also be electrically connected to the substrate 107 via the cylindrical portion 153b, the support portion 153d, and the screw 107a. In this case, the cylindrical portion 153b, the support portion 153d, and the screw 107a correspond to the first conductive component.

[0106] Furthermore, the base plate 152 is electrically connected to the base plate 107 via the bobbin portion 153b, the support portion 153d, and the screw 107a. This electrical connection makes it more difficult for static electricity to accumulate on the base plate 152, thus suppressing the effects of static electricity in the yarn monitoring device 110. The same electrical connection can also be made to the top plate 151.

[0107] Alternatively, screw 107a can also be an insulator. In this case, top plate 151 and bottom plate 152 can also be electrically connected through cylindrical portion 153b. In this case, cylindrical portion 153b acts as a second conductive component.

[0108] In the first embodiment, the second embodiment and the modified examples described above, the yarn monitoring device 10 and the yarn monitoring device 110 can also be used in various yarn-related devices other than the spinning machine 1.

[0109] [Experimental Example]

[0110] As an experimental example, a device with the same structure as the yarn monitoring device 10 described above was fabricated, and the effect of the yarn guide made of conductive material was confirmed. Additionally, as a comparative example, a conventionally used yarn guide made of ceramic (without an anti-static component) and cotton yarn were used. In the comparative example's yarn monitoring device, in monitoring cotton yarn (cotton Ne40), a detection value within a predetermined light intensity range was detected in the area corresponding to the short foreign object. However, in the comparative example's yarn monitoring device, in monitoring wool yarn (wool Nm48), not only a detection value within the predetermined light intensity range was detected in the area corresponding to the short foreign object, but also a detection value with extremely low (dark) light intensity was detected. In the case of wool, it is envisioned that static electricity is generated on the yarn, and this abnormal value is detected under the influence of static electricity. Regarding this point, in the yarn monitoring device of the test example, specifically in the monitoring of wool yarn (wool Nm48), only the detection value within the specified light intensity range was detected in the area corresponding to the short foreign object; no detection value with extremely low (dark) light intensity was detected. Static electricity generated on the wool yarn was appropriately removed via the static elimination section and the connecting section.

Claims

1. A yarn monitoring device for monitoring the state of a yarn traveling within a travel space, characterized in that it comprises: shell; and A yarn monitoring unit configured within the housing. The yarn monitoring unit has: A monitoring unit that monitors the state of the yarn traveling within the travel space; A yarn guide that guides the traveling yarn; and The monitor and the yarn guide are mounted on a retainer. The yarn guide includes a de-energizing section disposed close to the travel space and for de-energizing the charge generated by the travel of the yarn. The housing has a connection portion that is electrically connected to the current-eliminating part. The resistivity of the current-eliminating part is greater than or equal to the resistivity of the connecting part. The connecting part is electrically connected to the ground potential. The yarn monitoring device also includes: A first conductive component disposed on the housing; and The substrate transmits the information acquired by the monitoring unit to the outside of the yarn monitoring device and is electrically connected to the ground potential. The connection portion is electrically connected to the substrate via the first conductive component.

2. The yarn monitoring device according to claim 1, characterized in that, The yarn guide is an upstream yarn guide relative to the upstream side of the yarn travel direction. The current-eliminating unit is an upstream current-eliminating unit provided on the upstream yarn guide.

3. The yarn monitoring device according to claim 1, characterized in that, The yarn guide is a downstream yarn guide relative to the downstream side of the yarn travel direction. The current-eliminating unit is a downstream current-eliminating unit provided on the downstream yarn guide.

4. The yarn monitoring device according to claim 1, characterized in that, The yarn guide has an upstream yarn guide relative to the retainer erected on the upstream side of the yarn's travel direction, and a downstream yarn guide relative to the retainer erected on the downstream side of the yarn's travel direction. The static eliminator has an upstream static eliminator provided on the upstream yarn guide and a downstream static eliminator provided on the downstream yarn guide.

5. The yarn monitoring device according to claim 1, characterized in that, The yarn guide has an upstream yarn guide relative to the retainer erected on the upstream side of the yarn's travel direction, and a downstream yarn guide relative to the retainer erected on the downstream side of the yarn's travel direction. The static eliminator includes an upstream static eliminator provided on the upstream yarn guide member and a downstream static eliminator provided on the downstream yarn guide member. The connecting portion has an upstream connecting portion that contacts the upstream current-eliminating portion and a downstream connecting portion that contacts the downstream current-eliminating portion. The upstream connecting part is in contact with and electrically connected to the downstream connecting part. The upstream connection portion or the downstream connection portion is electrically connected to the substrate via the first conductive component.

6. The yarn monitoring device according to claim 1, characterized in that, It also includes a second conductive component disposed on the housing. The yarn guide has an upstream yarn guide relative to the retainer erected on the upstream side of the yarn's travel direction, and a downstream yarn guide relative to the retainer erected on the downstream side of the yarn's travel direction. The static eliminator includes an upstream static eliminator provided on the upstream yarn guide member and a downstream static eliminator provided on the downstream yarn guide member. The connecting portion has an upstream connecting portion that contacts the upstream current-eliminating portion and a downstream connecting portion that contacts the downstream current-eliminating portion. The upstream connection portion is electrically connected to the downstream connection portion via the second conductive component. The upstream connection portion or the downstream connection portion is electrically connected to the substrate via the first conductive component.

7. The yarn monitoring device according to any one of claims 1 to 6, characterized in that, The resistivity of the connection portion is greater than or equal to the resistivity of the first conductive component.

8. The yarn monitoring device according to any one of claims 1 to 6, characterized in that, The current-eliminating part of the yarn guide is made of a conductive material and has a guiding surface for guiding the yarn.

9. The yarn monitoring device according to claim 7, characterized in that, The current-eliminating part of the yarn guide is made of a conductive material and has a guiding surface for guiding the yarn.

10. The yarn monitoring device according to claim 8, characterized in that, The current-eliminating part of the yarn guide is made of conductive resin or conductive ceramic.

11. The yarn monitoring device according to claim 9, characterized in that, The current-eliminating part of the yarn guide is made of conductive resin or conductive ceramic.

12. The yarn monitoring device according to any one of claims 1 to 6, characterized in that, The yarn guide member has: Includes a guide body with a guide surface for guiding the yarn; and A current-eliminating body installed on the guide body and including the current-eliminating section. The guide body has a groove defined by the guide surface. The current-removing section of the current-removing body is arranged along the groove.

13. The yarn monitoring device according to claim 7, characterized in that, The yarn guide member has: Includes a guide body with a guide surface for guiding the yarn; and A current-eliminating body installed on the guide body and including the current-eliminating section. The guide body has a groove defined by the guide surface. The current-removing section of the current-removing body is arranged along the groove.

14. The yarn monitoring device according to any one of claims 1-6, 9-11, and 13, characterized in that, The resistivity of the current-removing section is 1.0 × 10⁻⁶. 6 Below Ω·m.

15. The yarn monitoring device according to claim 7, characterized in that, The resistivity of the current-removing section is 1.0 × 10⁻⁶. 6 Below Ω·m.

16. The yarn monitoring device according to claim 8, characterized in that, The resistivity of the current-removing section is 1.0 × 10⁻⁶. 6 Below Ω·m.

17. The yarn monitoring device according to claim 12, characterized in that, The resistivity of the current-removing section is 1.0 × 10⁻⁶. 6 Below Ω·m.

18. The yarn monitoring device according to any one of claims 1-6, 9-11, 13, 15-17, characterized in that, The yarn guide member has: The leading edge that guides the traveling yarn; and An inclined surface, which is connected to the front edge and extends upstream and / or downstream of the yarn in the direction of travel of the front edge, and is inclined away from the travel space.

19. The yarn monitoring device according to claim 7, characterized in that, The yarn guide member has: The leading edge that guides the traveling yarn; and An inclined surface, which is connected to the front edge and extends upstream and / or downstream of the yarn in the direction of travel of the front edge, and is inclined away from the travel space.

20. The yarn monitoring device according to claim 8, characterized in that, The yarn guide member has: The leading edge that guides the traveling yarn; and An inclined surface, which is connected to the front edge and extends upstream and / or downstream of the yarn in the direction of travel of the front edge, and is inclined away from the travel space.

21. The yarn monitoring device according to claim 12, characterized in that, The yarn guide member has: The leading edge that guides the traveling yarn; and An inclined surface, which is connected to the front edge and extends upstream and / or downstream of the yarn in the direction of travel of the front edge, and is inclined away from the travel space.

22. The yarn monitoring device according to claim 14, characterized in that, The yarn guide member has: The leading edge that guides the traveling yarn; and An inclined surface, which is connected to the front edge and extends upstream and / or downstream of the yarn in the direction of travel of the front edge, and is inclined away from the travel space.

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