JP2017088325A - Yarn drawer device and yarn winding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a constitution for improving detection accuracy in winding yarn, in a yarn drawer device for detecting the existence of the winding yarn on the inside of a pipe by a reflection type detection part.SOLUTION: A yarn drawer device comprises an upper yarn suction-capture part, a pipe part 32, a light transmission cover 50 and a detection part 60. The upper yarn suction-capture part sucks and captures yarn 14 being winding part side yarn by moving up to a winding part side capture position from a standby position. The pipe part 32 is a cylindrical member for passing the yarn 14 captured by the upper yarn suction-capture part, and includes the light transmission cover 50 for transmitting the irradiated light at least in a part. The detection part 60 detects the yarn 14 on the inside of the pipe part 32 by a light projection part 62 and a light receiving part 63. When viewed in the axial direction of the pipe part 32, the light projection part 62 and the light receiving part 63 are arranged in a position where an optical axis line L2 does not cross with a center C of a cylindrical cross section of the pipe part 32.SELECTED DRAWING: Figure 5

Description

  The present invention mainly relates to a yarn drawing device that draws a yarn from a winding unit.

  2. Description of the Related Art Conventionally, there is known a yarn drawing device that pulls out a yarn end wound around a package in order to perform, for example, yarn splicing. The yarn drawing device includes a suction port that sucks and captures the yarn end of the package, and a detection unit that detects the yarn captured by the suction port. When the detection unit detects the yarn, the suction port stops the generation of the suction flow. Patent document 1 discloses this kind of yarn drawing-out apparatus.

  In Patent Document 1, a detection window is formed in a pipe through which a wound yarn sucked by a suction port passes. The detection window has a configuration in which the surface of the pipe is cut out and a transparent plate is arranged in the cut-out portion. The detection part of patent document 1 detects the presence or absence of the winding yarn inside a pipe by irradiating light to this detection window.

  Specifically, Patent Document 1 discloses two types of detection units, a transmission type and a reflection type. The transmissive detection unit has a light projecting unit and a light receiving unit that face each other across the pipe, and based on whether or not the light emitted by the light projecting unit is blocked by the winding yarn, Detects the presence or absence of take-up. The reflection-type detection unit is based on whether or not the light receiving unit receives the reflected light that is reflected by the thread when the light projecting unit and the light receiving unit are arranged on the same side of the pipe. Then, the presence or absence of the winding yarn inside the pipe is detected.

International Publication No. 2015/029275

  However, when a reflective detection unit is used, the light projecting unit and the light receiving unit are arranged on the same side of the pipe, so that the light emitted by the light projecting unit is reflected by the detection window and the light receiving unit receives the light. there's a possibility that. As a result, it is conceivable that it is determined that there is a winding yarn even though there is no winding yarn inside the pipe.

  The present invention has been made in view of the above circumstances, and its main object is to detect the winding yarn in a yarn pulling device that detects the presence or absence of the winding yarn inside the pipe with a reflection type detection unit. It is in providing the structure which improved this.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to a first aspect of the present invention, the following configuration is provided in a yarn pulling device that draws a yarn of a package from a winding unit that winds the yarn to form a package. That is, the yarn drawing device includes a suction capturing unit, a pipe unit, and a detection unit. The suction capturing unit moves from a standby position to a capturing position on the winding unit side, and sucks and captures a winding yarn that is a yarn on the winding unit side. The pipe part is a cylindrical member that is connected to the suction capturing part and through which the winding yarn captured by the suction capturing part passes, and at least a part of the light transmitting part through which irradiated light is transmitted Including. The detection unit includes a light projecting unit and a light receiving unit, and the light projected from the light projecting unit to the light transmitting unit in the state where the suction capturing unit is located at the capturing position is the winding yarn. When the reflected light is received by the light receiving portion, the winding yarn inside the pipe portion is detected. When viewed in the axial direction of the pipe portion, the optical axis of the light projected by the light projecting portion and the light received by the light receiving portion is the center of the cylindrical cross section perpendicular to the thread passing direction of the pipe portion. The light projecting unit and the light receiving unit are arranged at positions that do not intersect.

  Thereby, a light projection part irradiates light toward the end of a pipe part. For this reason, the angle formed by the projected light and the surface of the light transmission part can be reduced, so that the light reflected by the light transmission part is not easily received by the light receiving part. Accordingly, it is possible to improve the detection accuracy of the wound yarn inside the pipe portion.

  In the yarn pulling device, an opening is formed in the pipe portion, and the light transmission portion is between an open position where the opening is exposed and a closed position where the opening is closed. It is preferable that the position can be changed.

  Thereby, even if it is a case where fluff etc. have adhered to the inner surface of a light transmission part, the adhering fluff can be easily cleaned by positioning a light transmission part in an open position.

  According to a second aspect of the present invention, the following configuration is provided in a yarn drawing device that draws a yarn from a package from a winding unit that winds the yarn to form a package. That is, the yarn drawing device includes a suction capturing unit, a pipe unit, and a detection unit. The suction capturing unit moves from a standby position to a capturing position on the winding unit side, and sucks and captures a winding yarn that is a yarn on the winding unit side. The pipe part is a cylindrical member that is connected to the suction capturing part and through which the winding yarn captured by the suction capturing part passes, and at least a part of the light transmitting part through which irradiated light is transmitted Including. The detection unit includes a light projecting unit and a light receiving unit, and the light receiving unit projects light received by the light projecting unit to detect the winding yarn inside the pipe unit. To do. An opening is formed in the pipe portion. The position of the light transmission part can be changed between an open position where the opening is exposed and a closed position where the opening is closed.

  Thereby, even if it is a case where fluff etc. have adhered to the inner surface of a light transmission part, the adhering fluff can be easily cleaned by positioning a light transmission part in an open position.

  In the yarn pulling device, when viewed in the axial direction of the pipe portion, the optical axis of the light projected by the light projecting portion and the light received by the light receiving portion is in the thread passing direction of the pipe portion. It is preferable that the light projecting unit and the light receiving unit are arranged at positions that do not intersect the center of the orthogonal cylindrical cross section.

  Thereby, a light projection part irradiates light toward the end of a pipe part. For this reason, the angle formed by the projected light and the surface of the light transmission part can be reduced, so that the light reflected by the light transmission part is not easily received by the light receiving part. Accordingly, it is possible to improve the detection accuracy of the wound yarn inside the pipe portion.

  In the yarn drawing device, it is preferable that the light transmission part is detachable from the pipe part.

  Thereby, even if the light transmission part is deteriorated, it can be easily replaced with a new one. Further, the light transmission part can be removed and carefully cleaned.

  In the yarn drawing device, it is preferable that the light projecting unit and the light receiving unit are arranged side by side in the axial direction of the pipe unit.

  Thereby, the detection accuracy of the wound yarn inside the pipe portion can be further improved.

  In the yarn pulling device, when viewed in the axial direction of the pipe portion, the light projecting portion, the light receiving portion, and the light transmitting portion are only on one side of the virtual line that divides the pipe portion in half. It is preferable that they are arranged.

  Thereby, since the size of the light transmission part can be suppressed, external light is hardly received by the light receiving part. Therefore, the winding yarn inside the pipe portion can be detected more accurately.

  The above-described yarn drawing device preferably has the following configuration. That is, the detection unit includes a case having a base portion and a protruding portion protruding from the base portion. The light projecting part and the light receiving part are attached to the projecting part of the case.

  Thereby, since a light projection part and a light-receiving part can be closely approached to a light transmission part, the detection precision of the winding thread | yarn inside a pipe part can be improved further.

  The above-described yarn drawing device preferably has the following configuration. That is, when viewed in the axial direction of the pipe part, the light transmission part is disposed at a position where a line drawn in the light irradiation direction from the light projecting part is directed from the outside to the inside of the pipe part. Yes. The light transmission part is not arranged at a position where a line drawn in the light irradiation direction from the light projecting part is directed from the inside to the outside of the pipe part.

  This makes it difficult for external light to be received by the light receiving unit. Accordingly, it is possible to further improve the detection accuracy of the wound yarn inside the pipe portion.

  According to a third aspect of the present invention, there is provided a yarn winding device that includes the yarn drawing device and the winding unit, and the detection unit is attached to the winding unit.

  Thereby, since the distance between the detection unit and the package is reduced by attaching the detection unit to the winding unit, it is possible to detect at an early stage whether or not the suction capturing unit has captured the winding yarn.

The front view of the automatic winder which concerns on one Embodiment of this invention. The side view of a winding unit. The perspective view of the vicinity of a winding part and a thread | yarn withdrawal apparatus. The expansion perspective view of the pipe part which shows a mode that a light transmission cover is opened and closed. Sectional drawing which shows the positional relationship of a light projection part, a light-receiving part, and a light transmission cover.

  Next, an automatic winder according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a schematic configuration of an automatic winder 1 of the present embodiment.

  As shown in FIG. 1, the automatic winder (yarn winding device) 1 includes a plurality of winding units 10 arranged side by side, a machine base control device 12, and a doffing device 13 as main components. .

  The machine base control device 12 is configured to be communicable with each winding unit 10. The operator of the automatic winder 1 can manage a plurality of winding units 10 collectively by appropriately operating the machine control device 12.

  Each winding unit 10 is configured to unwind the yarn 14 from the yarn supplying bobbin 16 and wind the yarn 14 around the winding bobbin 19 while traversing the yarn 14. As described above, the winding unit 10 forms the package 22.

  Each winding unit 10 includes a unit controller 100 on one side (the right side in FIG. 1) of the yarn feeding bobbin 16 and the package 22. The unit controller 100 includes, for example, a CPU and a ROM. The ROM stores a program for controlling each configuration of the winding unit 10. The CPU executes a program stored in the ROM.

  The doffing device 13 travels to the position of the winding unit 10 when the package 22 becomes full in each winding unit 10 (a state where a specified amount of yarn is wound), It is configured to remove and set an empty winding bobbin 19.

  Next, the configuration of the winding unit 10 will be described with reference to FIG. As shown in FIG. 2, the winding unit 10 includes a yarn supplying unit 15 and a winding unit 17.

  The yarn supplying section 15 is configured to hold a yarn supplying bobbin 16 placed on a conveyance tray (not shown) at a predetermined position. Thereby, the yarn 14 can be appropriately unwound from the yarn supplying bobbin 16. The yarn supplying unit 15 is not limited to the transport tray type, and may be a magazine type, for example.

  The winding unit 17 includes a cradle 18, a winding bobbin 19, and a winding drum 20 as main components.

  The cradle 18 has a pair of rotation support portions, and is configured to rotatably support the take-up bobbin 19 (or package 22) by sandwiching the take-up bobbin 19 with the rotation support portion. . The cradle 18 is configured to be switchable between a state in which the supporting package 22 is in contact with the winding drum 20 and a state in which the package 22 is separated from the winding drum 20.

  The winding drum 20 is for traversing the yarn 14 on the surface of the package 22 and rotating the package 22. The winding drum 20 is rotationally driven by a drum drive motor 21. With the outer periphery of the package 22 in contact with the winding drum 20, the winding of the winding drum 20 can be driven to rotate the package 22. A spiral traverse groove (traverse mechanism) is formed on the outer peripheral surface of the winding drum 20. The yarn 14 unwound from the yarn feeding bobbin 16 is wound around the surface of the package 22 while being traversed at a constant width by the traverse groove. Thereby, the package 22 having a constant winding width can be formed. Other members arranged in the winding unit 17 will be described later.

  Each winding unit 10 includes, in order from the yarn supplying unit 15 side, the unwinding assisting device 25, the tension applying device 27, and the yarn joining device 38 in the yarn traveling path between the yarn supplying unit 15 and the winding unit 17. And the clearer 40 is arranged. Further, in the vicinity of the yarn joining device 38, an upper yarn catching guide device 30 and a lower yarn catching guide device 34 are arranged. In the following description, the upstream side and the downstream side in the traveling direction of the yarn 14 may be simply referred to as “upstream side” and “downstream side”.

  The unwinding assisting device 25 includes a regulating member 26 that can be put on the core tube of the yarn feeding bobbin 16. The restricting member 26 is configured in a substantially cylindrical shape and is disposed so as to contact a balloon formed on the yarn layer upper portion of the yarn feeding bobbin 16. The balloon is a portion where the yarn 14 unwound from the yarn feeding bobbin 16 is swung around by centrifugal force. By bringing the regulating member 26 into contact with the balloon, the balloon 14 is brought into contact with the yarn 14 of the balloon portion to prevent the yarn 14 from being excessively swung. Thereby, the yarn 14 can be appropriately unwound from the yarn supplying bobbin 16.

  The tension applying device 27 applies a predetermined tension to the traveling yarn 14. In the present embodiment, the tension applying device 27 is configured by a gate type device in which movable comb teeth are arranged with respect to fixed comb teeth. The movable comb teeth are biased so that the comb teeth are engaged with each other. By passing the yarn 14 while bending the meshed comb teeth, an appropriate tension can be applied to the yarn 14 and the quality of the package 22 can be improved. However, the tension applying device 27 is not limited to the gate type, but may be a disk type, for example.

  The yarn joining device 38 includes a yarn 14 (lower yarn) on the yarn feeding unit 15 side and a winding unit when the yarn 14 is divided between the yarn feeding unit 15 and the winding unit 17 for some reason. The yarn 14 (upper yarn, winding yarn) on the 17 side is spliced. In the present embodiment, the yarn joining device 38 is configured as a splicer device that twists yarn ends together by a swirling air flow generated by compressed air. However, the yarn splicing device 38 is not limited to the splicer device, and for example, a mechanical knotter or the like can be employed.

  The upper thread catching guide device 30 is a device that catches the upper thread when the yarn 14 is in a divided state. The upper thread catching and guiding device 30 includes a shaft part 31, a pipe part 32, and an upper thread suction catching part (suction catching part) 33. Under the control of the unit control unit 100, the pipe unit 32 and the upper thread suction capturing unit 33 capture from the standby position (solid line in FIG. 2) on the yarn supplying unit 15 side to the winding unit 17 side with the shaft unit 31 as the turning center. It can be turned (moved) to a position (a chain line in FIG. 2). The upper thread catching and guiding device 30 is connected to a negative pressure source (not shown), and can generate a suction flow at the upper thread suction catching section 33 (specifically, the suction port at the tip). With this configuration, the upper thread suction capturing unit 33 can guide the upper thread to the yarn joining device 38 by capturing the upper thread at the capturing position and returning to the standby position.

  Similar to the upper thread catching and guiding device 30, the lower thread catching and guiding apparatus 34 includes a shaft portion 35, a pipe portion 36, and a lower thread suction catching portion 37. Similar to the upper thread suction catching section 33, the lower thread suction catching section 37 can be swung with the shaft portion 35 as a swiveling center and can generate a suction flow. With this configuration, the lower thread catching and guiding device 34 can catch the lower thread and guide it to the yarn joining device 38.

  The clearer 40 includes an unillustrated sensor for detecting the thickness of the yarn joining device 38. The clearer 40 detects a yarn defect such as a slab by monitoring a yarn thickness signal from the sensor. In the vicinity of the clearer 40, a cutter 41 is provided for cutting the yarn 14 immediately when the clearer 40 detects a yarn defect. The sensor detection result may be analyzed by a processing unit in the clearer 40 or may be analyzed by the unit control unit 100.

  As described above, the winding unit 10 can form the package 22 by winding the yarn 14 around the winding bobbin 19.

  Next, with reference to FIG. 3 to FIG. 5, a configuration in which the yarn 14 sucked and caught by the upper yarn catching and guiding device 30 is detected inside the pipe portion 32 will be described. In the following description, the axial direction of the pipe portion 32 may be simply referred to as “axial direction”. As shown in FIG. 3, the winding unit 17 includes a detection unit mounting plate 81 and a winding unit support plate 82. A configuration including the upper thread catching and guiding device 30 and the detection unit 60 is referred to as a thread drawing device 28.

  In the vicinity of the front end portion of the detection unit mounting plate 81, the detection unit 60 is mounted. In addition, the detection unit mounting plate 81 is fixed to the winding unit support plate 82 with bolts or the like in the vicinity of the end on the back side. The detection unit mounting plate 81 and the detection unit 60 are supported by the winding unit support plate 82.

  The winding portion support plate 82 is a metal member that supports members around the winding drum 20. By making the winding part support plate 82 made of metal, the detection part 60 can be grounded and exhausted. The winding unit support plate 82 also supports members other than the detection unit 60. Thereby, since the special member for supporting the detection part 60 is unnecessary, the increase in a number of parts can be suppressed.

  The detection unit 60 is configured as an optical sensor and determines the presence / absence of the yarn 14 inside the pipe portion 32 (in other words, success or failure of capturing the yarn 14 of the package 22 by the upper yarn suction capturing unit 33). Since the detection unit 60 is fixed to the winding unit 17 via the detection unit mounting plate 81 and the like as described above, the detection unit 60 is constant regardless of the rotation of the winding drum 20 and the turning of the upper thread suction capturing unit 33. Can keep the position of.

  As shown in FIG. 3, the detection unit 60 includes a case 61, a light projecting unit 62, and a light receiving unit 63.

  The case 61 is a box-shaped member, and is configured so that the light projecting unit 62 and the light receiving unit 63 can be attached. Further, as shown in FIGS. 3 and 5, bolt holes are formed in the case 61. The detection unit 60 (specifically, the case 61) can be fixed to the detection unit mounting plate 81 by inserting a bolt into the bolt hole.

  As shown in FIG. 5, the case 61 is formed with a base portion 61a, a protruding portion 61b, and a curved portion 61c. The base portion 61a is a portion where the above-described bolt hole is formed. The protruding portion 61b is a portion protruding from the base portion 61a. In other words, the protruding portion 61b is a portion having a larger thickness (length in the bolt insertion direction, length in the light irradiation direction of the light projecting portion 62) than the base portion 61a. A light projecting unit 62 and a light receiving unit 63 are attached to the protruding portion 61b. The curved portion 61c is a curved portion that connects the base portion 61a and the protruding portion 61b.

  The light projecting unit 62 is composed of a light emitting element such as a light emitting diode, and irradiates the light transmitting cover 50 (light transmitting unit, details will be described later) of the pipe unit 32 with light. The light irradiated by the light projecting unit 62 is transmitted through the light transmission cover 50, and when the yarn 14 exists inside the pipe portion 32, it is reflected by the yarn 14.

  The light receiving unit 63 is composed of a light receiving element such as a photodiode, and receives light (reflected light) reflected by the yarn 14 and outputs an electric signal having a current or voltage corresponding to the light amount. An arithmetic unit (not shown) is arranged inside the case 61. This calculation unit analyzes the electrical signal output from the light receiving unit 63 and determines the presence or absence of the yarn 14 inside the pipe unit 32. The calculation unit outputs the determination result of the presence or absence of the thread 14 inside the pipe unit 32 to the unit control unit 100. When the yarn 14 is detected inside the pipe portion 32, the unit controller 100 determines that the yarn 14 has been successfully pulled out. The determination process performed by the calculation unit may be performed by the unit control unit 100.

  Next, the light transmission cover 50 which the pipe part 32 has is demonstrated. As shown in FIG. 4, a concave portion 71 and an opening 72 are formed in the pipe portion 32. The concave portion 71 is a portion where a part of the members constituting the pipe portion 32 is thinned. The opening 72 is a through hole formed in the center of the recess 71. 4 and 5, the opening 72 is formed on one side (the right side in FIG. 5) from the center in the package width direction.

  An opening / closing support portion 73 is formed in the vicinity of the circumferential end of the recess 71. The opening / closing support part 73 is a member that supports the light transmission cover 50 so as to be openable / closable (rotatable). A mounting hole (not shown) is formed in the opening / closing support portion 73, and the light transmission cover 50 is attached to the mounting hole. Note that the axial direction of the mounting hole is the same as the axial direction of the pipe portion 32.

  The opening / closing support part 73 is formed with an attaching / detaching groove 74 (details will be described later) for attaching / detaching the light transmission cover 50 and a reinforcing part 75 for reinforcing the opening / closing support part 73. As shown in FIG. 5, a fitting claw portion 76 is formed on the opposite side of the opening / closing support portion 73 with the opening 72 therebetween. The fitting claw portion 76 is a portion obtained by further extending a part of the end portion in the circumferential direction of the pipe portion 32.

  The light transmission cover 50 is a member for closing the opening 72. The light transmission cover 50 is made of a material that transmits light (such as acrylic or polycarbonate).

  As shown in FIG. 4, the light transmission cover 50 includes a curved portion 51 that is a curved plate-like member. The curved portion 51 is configured in a shape that can close the opening 72 while bringing the inner surface into contact with the recess 71. The outer peripheral surface of the bending portion 51 has the same curvature as the outer peripheral surface of the pipe portion 32, and the bending portion 51 closes the opening 72 to form a cylinder.

  A pair of connecting portions 52 is formed at one end in the longitudinal direction (circumferential direction) of the bending portion 51. The connecting portion 52 has a not-shown protruding shaft that protrudes in the axial direction. This protruding shaft is inserted into a mounting hole (not shown) of the opening / closing support portion 73. Thereby, the bending part 51 can be supported so that opening and closing (rotation possible) is possible. With this configuration, the light transmission cover 50 can be positioned at least in an open position where the opening 72 is exposed and a closed position where the opening 72 is closed.

  In addition, as described above, the opening / closing support portion 73 is formed with the attaching / detaching groove 74 cut out in the axial direction. The depth of the detachable groove 74 is not constant, and a groove having a predetermined shape is formed. In addition, a protrusion having a shape corresponding to the groove having a predetermined shape of the attachment / detachment groove 74 is formed on the connection portion 52, and the groove of the attachment / detachment groove 74 and the connection portion 52 are formed by opening the light transmitting cover 50 greatly. It is comprised so that protrusion may fit. With this configuration, the light transmission cover 50 can be removed from the pipe portion 32 only when the light transmission cover 50 is largely opened.

  A cutout portion 53 that is a rectangular cutout is formed at one end of the bending portion 51 in the longitudinal direction. The notch 53 is formed so that the curved portion 51 does not interfere with the reinforcing portion 75 when the light transmission cover 50 is largely opened.

  As shown in FIG. 5, a fitting groove portion 54 is formed at the other end in the longitudinal direction of the bending portion 51. The fitting groove 54 is a groove formed so that the depth direction coincides with the longitudinal direction (circumferential direction). Since the light transmission cover 50 is located at the closed position, the fitting claw portion 76 enters the fitting groove portion 54. Thereby, it is possible to prevent the light transmission cover 50 from being opened due to vibration or the like. Moreover, since the opening part 72 can be closed substantially completely, it can prevent that the suction | inhalation effect | action falls because air flows in into the pipe part 32 from the exterior.

  Thus, in this embodiment, the light transmission cover 50 is configured to be openable and detachable. Therefore, even when the inner surface of the light transmission cover 50 is soiled by cotton or the like, the inner surface of the light transmission cover 50 can be cleaned by opening the light transmission cover 50. Even if the light transmission cover 50 is deteriorated, the light transmission cover 50 can be replaced. In particular, according to the present embodiment, a mounting tool such as a bolt and a tool are unnecessary when opening and closing and when attaching and detaching, so that the burden on the operator can be further reduced.

  Next, the positional relationship among the light projecting unit 62, the light receiving unit 63, the light transmission cover 50, and the like will be described.

  As described in the problem of the prior art, in the reflection type detection unit, the light receiving unit may receive the light reflected by the surface of the light transmission unit. In order to prevent this, the light projecting unit 62 and the light receiving unit 63 are arranged closer to one side than the center of the pipe unit 32 in the package width direction (the imaginary line L1 in FIG. 5). In the following description, a line indicating the optical axis of the light projected from the light projecting unit 62 and the light directed to the light receiving unit 63 in FIG. 5 is referred to as an optical axis L2. Further, in the cross section (FIG. 5) obtained by cutting the pipe portion 32 in a direction perpendicular to the axial direction (thread passing direction), the center of the cylindrical cross section is defined as a center C. In the present embodiment, the light projecting unit 62 and the light receiving unit 63 are arranged so that the optical axis L2 does not intersect the center C. If the light projecting part 62 irradiates light toward the center C of the pipe part 32, the light and the light transmitting cover 50 form a substantially right angle. On the other hand, when the light projecting unit 62 irradiates light at a position avoiding the center C of the pipe portion 32 as in the present embodiment, as shown in FIG. 5 (a diagram viewed in the axial direction of the pipe portion), The angle formed between the light and the light transmission cover 50 can be reduced. As a result, since the light reflected from the surface of the light transmission cover 50 is less likely to be reflected in a direction different from the light receiving portion 63, the detection accuracy of the yarn 14 inside the pipe portion 32 can be improved.

  The layout of this embodiment will be described in more detail. In this embodiment, when viewed in the axial direction, the optical axis L2 does not intersect with the virtual line L1, which is a straight line that divides the pipe portion 32 in half. With this configuration, the light projecting unit 62 irradiates light at a position farther from the center C of the pipe portion 32 (position closer to the wall portion of the pipe portion 32 than the center C of the pipe portion 32). In the present embodiment, the imaginary line L1 is drawn so as to pass through the center in the package width direction, but the imaginary line L1 may be drawn in another direction as long as it passes through the axis (center) of the pipe portion 32.

  Here, when the light projecting unit 62 irradiates light at a position avoiding the center C of the pipe portion 32, the length of travel of the light within the pipe portion 32 is shortened, so that the detection accuracy of the yarn 14 is lowered. It seems like. However, the yarn 14 sucked by the upper yarn suction catching portion 33 is caused to flow downstream by the suction flow. At this time, if there is a yarn guide inside the pipe portion 32 or if the end portion of the yarn 14 is clamped and pulled by something, the movement of the yarn 14 may be stabilized. In the present embodiment, since such a configuration is not employed, the yarn 14 (particularly in the vicinity of the end portion) flows downstream while moving vigorously. Further, the suction port of the upper thread suction catching portion 33 is about the size of the package width, but the diameter of the pipe portion 32 is considerably smaller than the package width. Accordingly, the flow of the suction flow may be disturbed at the connecting portion between the upper yarn suction catching portion 33 and the pipe portion 32. Even in this point, the yarn 14 flows downstream while moving violently. Therefore, the sucked yarn end can be detected.

  From the above, even when light is applied only to the end portion of the pipe portion 32, the possibility that the light hits the yarn 14 is high. In particular, in the present embodiment, since the light projecting unit 62 and the light receiving unit 63 are arranged along the axial direction of the pipe portion 32 (the traveling direction of the yarn 14), the yarn 14 can be detected more reliably.

  Moreover, when irradiating light to the end part of the pipe part 32 like this embodiment, the distance from the light projection part 62 and the light-receiving part 63 to the light transmission cover 50 tends to become long. In this respect, in the present embodiment, as described above, the light projecting unit 62 and the light receiving unit 63 are provided on the protruding portion 61b protruding from the base portion 61a. Accordingly, since the light projecting unit 62 and the light receiving unit 63 can be brought close to the light transmitting cover 50, it is possible to suppress the attenuation of the light projected by the light projecting unit 62 and the possibility of receiving external light. be able to.

  Furthermore, in the present embodiment, in order to further reliably prevent receiving external light, a line (a line obtained by further extending the optical axis L2) drawn from the light projecting unit 62 in the light irradiation direction is outside the pipe unit 32. The light transmission cover 50 is arranged at a position (in the upper part of FIG. 5) from the inside to the inside, and the light transmission cover 50 is not arranged at a position where this line goes from the inside to the outside of the pipe portion 32. Thereby, it is possible to prevent external light in the direction along the virtual line from being received. Furthermore, the light transmission cover 50 is disposed only on the one side (the side where the light projecting unit 62 and the light receiving unit 63 are disposed) from the virtual line L1. Thereby, since the size of the light transmission cover 50 can be suppressed, external light is hardly received by the light receiving unit 63.

  As described above, the yarn drawing device 28 according to the present embodiment includes the upper yarn suction capturing unit 33, the pipe unit 32, the light transmission cover 50, and the detection unit 60. The upper thread suction / capturing section 33 moves from the standby position to the capturing position on the winding section 17 side, and sucks and captures the thread 14 that is a thread on the winding section 17 side. The pipe portion 32 is a cylindrical member that is connected to the upper thread suction / capture unit 33 and through which the yarn 14 captured by the upper thread suction / capture unit 33 passes, and includes at least a light transmission cover 50 through which irradiated light is transmitted. Partly included. In the detection unit 60, the light receiving unit 63 receives the light reflected by the yarn 14 when the light projecting unit 62 projects the light transmitting cover 50 in a state where the upper thread suction capturing unit 33 is located at the capturing position. Thus, the yarn 14 inside the pipe portion 32 is detected. When viewed in the axial direction of the pipe portion 32, the center C of the cylindrical cross section in which the optical axes of the light projected by the light projecting portion 62 and the light received by the light receiving portion 63 are orthogonal to the yarn passing direction of the pipe portion 32. The light projecting unit 62 and the light receiving unit 63 are arranged at a position that does not intersect with.

  Thereby, the light projecting unit 62 emits light toward the end of the pipe unit 32. Therefore, the angle formed by the projected light and the surface of the light transmission cover 50 can be reduced, so that the light reflected by the light transmission cover 50 is not easily received by the light receiving unit 63. Therefore, the detection accuracy of the yarn 14 inside the pipe portion 32 can be improved. The light projecting unit 62 irradiates light toward the end of the pipe portion 32, but the yarn 14 (particularly the yarn end) sucked by the upper yarn suction catching portion 33 moves downstream while moving violently. 14 can be detected without any problem.

  Further, in the yarn drawing device 28 of the present embodiment, the light transmission cover 50 can be changed in position between an open position where the opening 72 is exposed and a closed position where the opening 72 is closed.

  Thereby, even if it is a case where fluff etc. have adhered to the inner surface of the light transmission cover 50, the adhering fluff can be easily cleaned by positioning the light transmission cover 50 in an open position.

  Further, in the yarn drawing device 28 of the present embodiment, the light transmission cover 50 is detachable from the pipe portion 32.

  Thereby, even if the light transmission cover 50 is deteriorated, it can be easily replaced with a new one. Further, the light transmission cover 50 can be removed and carefully cleaned.

  The preferred embodiments and modifications of the present invention have been described above, but the above configuration can be modified as follows, for example.

  In the above embodiment, both the feature (feature A) that the optical axis of the detection unit 60 does not intersect the virtual line L1 that divides the pipe portion 32 in half and the feature (feature B) that the light transmission cover 50 can be opened and closed. However, it may have only one of the characteristics. For example, when it has the feature A, the light transmission cover 50 of the pipe part 32 does not need to be opened and closed. For example, the opening 72 may not be formed in the pipe portion 32, and the entire pipe portion 32 may be made of a material that transmits light. Further, in the case of having the feature B, the optical axis of the detection unit 60 may intersect the center C. Further, in the case of having the feature B, the light projecting unit and the light receiving unit are arranged so as to sandwich the pipe unit 32, and the light receiving unit receives the light emitted by the light projecting unit and transmitted through the yarn. It may be a configuration.

  In the above-described embodiment, a fixture such as a bolt is not required for opening and closing and attachment / detachment, but a configuration in which opening / closing and attachment / detachment is performed using the attachment may be employed. Moreover, the structure which can only be opened and closed or only detachable may be sufficient.

  In the above embodiment, the pipe part 32 and the detection part 60 are arranged on the left side when viewed from the front, but may be on the right side. In addition, the detection unit 60 uses the yarn 14 in the vicinity of the end on the upper yarn suction / capturing unit 33 side of the pipe portion 32 as a detection target, but the yarn 14 flowing on the downstream side may be the detection target.

  In the above, the traverse is performed by the winding drum 20 in which the traverse groove is formed, but an arm type, belt type, or rotary type traverse device may be used. In this case, a roller in which no traversing groove is formed can be used as the auxiliary roller.

  The present invention can be applied not only to an automatic winder but also to other yarn winding devices such as a winding machine and a spinning machine (for example, an air spinning machine and an open-end spinning machine).

DESCRIPTION OF SYMBOLS 1 Automatic winder 28 Thread drawing device 30 Upper thread catching guide device 31 Shaft portion 32 Pipe portion 33 Upper thread suction catching portion (suction catching portion)
50 Light transmission cover (light transmission part)
60 Detector 61 Case 62 Light Emitter 63 Light Receiver 72 Opening

Claims (10)

In a yarn drawing device that draws a yarn from a winding unit that winds a yarn to form a package,
A suction capturing unit that moves from a standby position to a capturing position on the winding unit side, and sucks and captures the winding yarn that is the yarn on the winding unit side;
A pipe member that is connected to the suction capturing unit and is a cylindrical member through which the winding yarn captured by the suction capturing unit passes, and that includes at least a light transmitting unit through which irradiated light is transmitted;
A light projecting unit and a light receiving unit, and the light projected by the light projecting unit to the light transmitting unit in a state where the suction capturing unit is located at the capturing position is reflected by the winding yarn; When the light receiving unit receives light, a detection unit that detects the winding yarn inside the pipe unit;
With
When viewed in the axial direction of the pipe portion, the optical axis of the light projected by the light projecting portion and the light received by the light receiving portion is the center of the cylindrical cross section perpendicular to the thread passing direction of the pipe portion. The yarn drawing device, wherein the light projecting unit and the light receiving unit are arranged at positions that do not intersect. The yarn drawing device according to claim 1,
The pipe portion is formed with an opening,
The yarn drawing device according to claim 1, wherein the position of the light transmitting portion can be changed between an open position where the opening is exposed and a closed position where the opening is closed. In a yarn drawing device that draws a yarn from a winding unit that winds a yarn to form a package,
A suction capturing unit that moves from a standby position to a capturing position on the winding unit side, and sucks and captures the winding yarn that is the yarn on the winding unit side;
A pipe member that is connected to the suction capturing unit and is a cylindrical member through which the winding yarn captured by the suction capturing unit passes, and that includes at least a light transmitting unit through which irradiated light is transmitted;
A light-receiving unit and a light-receiving unit, and the light-receiving unit receives the light projected to the pipe unit by the light-receiving unit, thereby detecting the winding yarn inside the pipe unit;
With
The pipe portion is formed with an opening,
The yarn drawing device according to claim 1, wherein the position of the light transmitting portion can be changed between an open position where the opening is exposed and a closed position where the opening is closed. The yarn drawing device according to claim 3,
When viewed in the axial direction of the pipe portion, the optical axis of the light projected by the light projecting portion and the light received by the light receiving portion is the center of the cylindrical cross section perpendicular to the thread passing direction of the pipe portion. The yarn drawing device, wherein the light projecting unit and the light receiving unit are arranged at positions that do not intersect. The yarn pulling device according to any one of claims 1 to 4,
The yarn drawing device, wherein the light transmission part is detachable from the pipe part. The yarn pulling device according to any one of claims 1 to 5,
The yarn drawing device, wherein the light projecting portion and the light receiving portion are arranged side by side in the axial direction of the pipe portion. The yarn drawing device according to claim 1 or 2,
When viewed in the axial direction of the pipe part, the light projecting part, the light receiving part, and the light transmitting part are arranged only on one side of a virtual line that divides the pipe part in half. Thread pulling device. The yarn pulling device according to any one of claims 1 to 7,
The detection part includes a case having a base part and a protruding part protruding from the base part,
The yarn drawing device, wherein the light projecting portion and the light receiving portion are attached to the projecting portion of the case. The yarn pulling device according to any one of claims 1 to 8,
When viewed in the axial direction of the pipe part,
In the position where the line drawn in the light irradiation direction from the light projecting part is directed from the outside to the inside of the pipe part, the light transmitting part is disposed,
The yarn drawing device according to claim 1, wherein the light transmission portion is not arranged at a position where a line drawn in the light irradiation direction from the light projecting portion is directed from the inside to the outside of the pipe portion. A yarn winding device comprising the yarn drawing device according to any one of claims 1 to 9 and the winding unit,
The yarn winding device, wherein the detection unit is attached to the winding unit.

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