Yarn take-up machine

Abstract

A yarn winder is provided. A yarn winder (2) winds a yarn (Y) delivered from a supply section (6) in an accumulation region (A) and temporarily accumulates the yarn (Y) by rotating an accumulation roller (41). A detection section (53) is a line sensor (53A) that detects the presence or absence of the yarn (Y) in a straight line section (S1) of the accumulation region (A).

Description

Technical Field

[0001] One aspect of the present invention relates to a yarn winding machine. Background Technology

[0002] A yarn take-up machine (yarn take-up device) is known, comprising: a yarn feeding section supporting a yarn feeding bobbin; a yarn storage device for unwinding yarn from the yarn feeding bobbin supported by the yarn feeding section and taking up the unwound yarn; a splicing device for splicing the yarn ends of the yarn on the yarn feeding bobbin side to the yarn ends of the yarn storage device side; and a yarn take-up section for taking up the yarn to form a package. As such a yarn take-up machine, Patent Document 1 (Japanese Patent Application Laid-Open No. 2013-241231) discloses a yarn take-up machine in which an upper limit sensor is arranged near the outer peripheral surface of the cylindrical portion of the storage roller to detect when the amount of yarn on the storage roller is above a predetermined upper limit, and a lower limit sensor is arranged to detect when the amount is below a predetermined lower limit. Furthermore, the unit control unit of the yarn take-up machine in Patent Document 1 controls the drive motor based on the detection results of these sensors, so that the amount of yarn stored (wound) on the storage roller converges between the aforementioned upper limit and the aforementioned lower limit.

[0003] In such a yarn take-up machine, it is desirable to achieve more precise control, or to detect take-up abnormalities in the yarn storage device, by not only detecting the upper or lower limit of the yarn accumulation amount in detail, but also detecting the amount of yarn wound in the yarn storage device in detail. In this case, for example, increasing the number of sensors can enable detailed detection of the accumulation amount, but this results in a more complex configuration and higher cost. Summary of the Invention

[0004] Therefore, one aspect of the present invention is to provide a yarn take-up machine that can inexpensively detect the amount of yarn wound on a yarn storage device with a simple configuration.

[0005] A yarn take-up machine according to one aspect of the present invention includes: a supply unit capable of supplying yarn; a take-up unit capable of taking the yarn supplied from the supply unit to form a package; a yarn storage device provided in the middle of the yarn travel path formed between the supply unit and the take-up unit, which temporarily stores the yarn fed from the supply unit by rotating the storage roller and winding it around the storage area on the outer peripheral surface of the storage roller; a control unit for controlling the rotation of the storage roller; and a detection unit for detecting the yarn wound around the outer peripheral surface of the storage roller, wherein the detection area of ​​the detection unit is a straight section in the storage area connecting the end side of the upstream storage area in the yarn travel direction and the end side of the downstream storage area located downstream of the end side in the yarn travel direction, and the detection unit is a line sensor for detecting whether there is yarn in the straight section.

[0006] Therefore, it is possible to detect the presence or absence of yarn within the aforementioned straight section of the storage area without the need to install sensors to detect the presence or absence of yarn at various points in the storage area. As a result, the amount of yarn stored in the yarn storage device can be detected inexpensively with a simple configuration.

[0007] In one aspect of the yarn take-up machine of the present invention, the line sensor may be configured such that the extension direction of the detection area of ​​the detection unit is parallel to the extension direction of the rotation axis of the accumulation roller. In this configuration, the line sensor detects light reflected by the accumulation roller or yarn in the region parallel to the extension direction of the rotation axis of the accumulation roller. Therefore, the reflection mode of the accumulation roller or yarn in the aforementioned straight line interval can be made uniform.

[0008] Alternatively, in one aspect of the yarn take-up machine, the present invention further includes a light-emitting unit that emits light toward the storage roller. A yarn sensor receives light reflected by the storage roller or the yarn. When the yarn sensor receives light (detects incident light), the control unit determines that the light received by the yarn sensor is light reflected by either the storage roller or the yarn, and determines whether there is yarn in the straight section based on the result of the determination. In this configuration, the presence or absence of yarn is determined based on the detection result of light reflected by the storage roller or the yarn, thereby simplifying the processing.

[0009] In one aspect of the yarn take-up machine of the present invention, the light-emitting unit may have two light sources and a light waveguide that converts the light emitted from the two light sources into surface-emitting light and emits it toward the storage roller. The yarn sensor receives the light via a lens that reduces the incident light. In this configuration, the light emitted from the light-emitting unit can be homogenized, thus improving the accuracy of yarn detection and allowing the detection unit to be compactly arranged.

[0010] In one aspect of the yarn take-up machine of the present invention, the yarn sensor may be positioned such that light from the light-emitting part reflected by the outer peripheral surface of the accumulation roller is not incident, but light from the light-emitting part reflected by the yarn stored on the accumulation roller is incident. In this configuration, the detection accuracy of white yarns that easily reflect light can be improved. Specifically, by detecting the presence or absence of yarn based on reflected light from the yarn stored on the accumulation roller, the incident light from parts other than the yarn is reduced, thus improving the yarn detection accuracy.

[0011] Alternatively, in one aspect of the yarn take-up machine, a cover is provided opposite a portion of the outer peripheral surface of the accumulation roller. This cover is positioned in at least a portion of the direction of travel of light from the light-emitting portion reflected by the outer peripheral surface of the accumulation roller. In this configuration, a cover is provided to suppress the scattering and accumulation of fly shavings generated in the accumulation roller within the peripheral structure. Furthermore, in this configuration, the airflow generated by the rotation of the accumulation roller is controlled by the cover, thereby preventing the yarn end from contacting the peripheral structure. In this configuration, by providing the cover in the direction of travel of light from the light-emitting portion reflected by the outer peripheral surface of the accumulation roller, the yarn sensor can be prevented from detecting the light from the light-emitting portion reflected by the outer peripheral surface of the accumulation roller.

[0012] In one aspect of the yarn take-up machine of the present invention, when viewed from above along the direction extending from the rotation axis of the storage roller, one of the straight lines orthogonal to the rotation axis is hypothetically designated as a first straight line, and one of the straight lines parallel to the first straight line and tangent to the outer peripheral surface of the storage roller is hypothetically designated as a second straight line. The yarn sensor is disposed between the first and second straight lines, and the light-emitting part is disposed on the first straight line. Alternatively, it can be disposed between the yarn sensor and the first straight line in the arrangement direction of the first and second straight lines, covering the area opposite to the side where the first straight line is disposed in the arrangement direction of the first and second straight lines. In this configuration, the yarn sensor is disposed between the first and second straight lines. Therefore, the yarn sensor receives light from a straight line parallel to the straight line passing through the center of the storage roller and in a direction different from the straight line passing through the center of the storage roller in the arrangement direction. That is, light reflected by the storage roller or the yarn at the curved portion of the storage roller can be separated, thus improving the yarn detection accuracy.

[0013] In one aspect of the yarn take-up machine of the present invention, the portion of the cover where light from the light-emitting part is incident may be black. In this configuration, light from the light-emitting part reflected by the outer peripheral surface of the accumulation roller is absorbed by the cover. This reduces the amount of light reflected from parts other than the yarn that incident on the yarn sensor, thus improving the yarn detection accuracy.

[0014] In one aspect of the yarn take-up machine of the present invention, the light-emitting unit may include a light-emitting unit for white yarn and a light-emitting unit for colored yarn. A yarn sensor is positioned where light from the white yarn light-emitting unit, reflected from the outer peripheral surface of the accumulation roller, is not incident, but is incident on light reflected from the white yarn light-emitting unit by the yarn stored in the accumulation roller. It is also positioned where light from the colored yarn light-emitting unit, reflected from the outer peripheral surface of the accumulation roller, is incident. In this configuration, regardless of whether the yarn used in the yarn take-up machine is white or colored (such as black), the presence or absence of yarn can be detected with high precision by switching the light-emitting unit between the white yarn light-emitting unit and the colored yarn light-emitting unit.

[0015] In one aspect of the yarn take-up machine of the present invention, a mode switching unit may also be included. This mode switching unit can selectively switch between a detection mode for white yarn (i.e., a white yarn detection mode) and a detection mode for colored yarn (i.e., a colored yarn detection mode). When the white yarn detection mode is selected in the mode switching unit, the control unit causes the white yarn light-emitting unit to emit light and determines that there is yarn in the portion where the yarn sensor receives light. When the colored yarn detection mode is selected in the mode switching unit, the colored yarn light-emitting unit emits light and determines that there is yarn in the portion where the yarn sensor does not receive light. In this configuration, appropriate control and appropriate determination of the yarn used in the yarn take-up machine can be performed to match the detection mode.

[0016] In one aspect of the yarn take-up machine of the present invention, the yarn sensor may be positioned at the point where light from the light-emitting part is incident, reflected by the outer peripheral surface of the storage roller. This configuration improves the detection accuracy of black (colored) yarns that are difficult to reflect light from when wound on the storage roller.

[0017] In one aspect of the yarn take-up machine of the present invention, the control unit may rotate the accumulation roller at least once and determine whether there is yarn in the accumulation area based on the detection result of the yarn sensor when the accumulation roller has rotated at least once. In this configuration, it is possible to determine whether there is yarn in all parts or only necessary parts of the accumulation roller, and it is possible to evaluate the outer peripheral surface constituting the accumulation roller.

[0018] In one aspect of the yarn take-up machine of the present invention, at least one recess extending along the rotation axis of the accumulation roller may be formed on the outer peripheral surface of the accumulation roller, and the control unit determines that the accumulation roller has rotated one revolution by detecting that the recess, which serves as a reference, has rotated one revolution. In this configuration, the rotation of the accumulation roller can be determined by a simple method.

[0019] In one aspect of the yarn take-up machine of the present invention, the control unit may determine whether there is yarn in the storage area based on the detection results of a wire sensor at a position different from the recess. In this configuration, for example, by detecting or not detecting the recess by the wire sensor, the possibility of the control unit misjudging the presence or absence of yarn can be reduced.

[0020] In one aspect of the yarn take-up machine of the present invention, a plurality of recesses may be formed on the outer peripheral surface of the accumulation roller along the rotation direction of the accumulation roller, and a plurality of regions, i.e., connecting portions, between adjacent recesses in the rotation direction may be formed. The control unit determines whether there is yarn in the accumulation region based on the detection results of the thread sensors in at least a portion of the regions of each of the plurality of connecting portions. In this configuration, the yarn detection accuracy can be improved in the accumulation roller with recesses formed on the outer peripheral surface.

[0021] In one aspect of the yarn take-up machine of the present invention, the control unit may infer information related to the yarn stored in the storage roller based on the amount of yarn supplied from the supply unit and the amount of yarn wound by the take-up unit, and determine whether the yarn is being wound uniformly in the storage area based on the information related to the yarn and the detection results of the yarn sensor. In this configuration, it is possible to determine whether the yarn is being wound uniformly in the storage area with a simple configuration.

[0022] In one aspect of the yarn take-up machine of the present invention, the take-up unit may form a package by rotating a take-up bobbin and winding the yarn fed from the yarn accumulation device onto the take-up bobbin. The control unit may infer information related to the yarn accumulated on the accumulation roller based on the average value of the difference between the rotational speed of the accumulation roller and the rotational speed of the take-up bobbin. In this configuration, information related to the yarn accumulated on the accumulation roller can be accurately inferred.

[0023] In one aspect of the yarn take-up machine of the present invention, when the yarn accumulation amount, which is information related to the yarn, is set as the estimated accumulation amount, and the yarn accumulation amount calculated based on the detection result of the yarn sensor is set as the detected accumulation amount, the control unit determines that yarn breakage has occurred in the yarn accumulation device when the difference between the detected accumulation amount and the estimated accumulation amount is greater than the yarn breakage determination accumulation amount. Furthermore, yarn breakage refers to a state where several layers of yarn cannot be stably unwound from the accumulation roller, and are tangled together and unwound all at once, like a loop coming off. In this configuration, yarn breakage can be determined to occur in the accumulation roller through a simple configuration.

[0024] In one aspect of the yarn take-up machine of the present invention, the control unit may determine that yarn breakage has occurred in the yarn accumulation device when the movement per unit time of the downstream position of the yarn accumulated in the accumulation area is greater than the yarn breakage determination movement (T2) based on the detection result of the yarn sensor. In this configuration, yarn breakage can be determined to occur in the accumulation roller with a simple configuration.

[0025] In one aspect of the yarn take-up machine of the present invention, when the yarn accumulation amount, which is information related to the yarn, is set as the estimated accumulation amount, and the yarn accumulation amount calculated based on the detection result of the yarn sensor is set as the detected accumulation amount, if the difference between the estimated accumulation amount and the detected accumulation amount is greater than the yarn clump determination accumulation amount, it is determined that a yarn clump (so-called yarn ball) has been generated in the yarn accumulation device. Furthermore, a yarn clump refers to a state in which the yarn wound on the outer periphery of the accumulation roller is wound in an uneven and overlapping manner. In this configuration, the generation of a yarn clump in the accumulation roller can be determined with a simple configuration.

[0026] According to one aspect of the invention, the amount of yarn wound in a yarn storage device can be detected cheaply with a simple configuration. Attached Figure Description

[0027] Figure 1 This is a summary front view showing the overall configuration of an automatic winding machine according to one embodiment.

[0028] Figure 2 This is a schematic side view of a winding machine unit according to one embodiment.

[0029] Figure 3 This is a perspective view showing the yarn storage device included in the winding machine unit.

[0030] Figure 4 (A) is a diagram showing the configuration relationship between the yarn storage device and the detection unit. Figure 4 (B) is a diagram showing the configuration relationship between the yarn storage device and the light-emitting part. Figure 4 (C) is a diagram showing the configuration relationship between the yarn storage device and the detection unit.

[0031] Figure 5 (A) is a diagram in which the outer circumferential surface of the accumulation roller is unfolded in a planar manner in which a portion of it is repeated in the rotational direction. Figure 5 (B) is a diagram in which the outer circumferential surface of the accumulation roller is unfolded in a planar manner with a portion of it repeated in the rotational direction when yarn is present on the outer circumferential surface of the accumulation roller. Figure 5 (C) is a diagram in which the outer peripheral surface of the accumulation roller is unfolded in a planar manner with a portion of it repeating in the rotational direction when yarn and recess are present on the outer peripheral surface of the accumulation roller.

[0032] Figure 6 This is a diagram illustrating an example of the results obtained by a line sensor.

[0033] Figure 7 (A) is a diagram illustrating an example of the relationship between the detected storage volume and the estimated storage volume during the process of increasing the storage volume of yarn in a yarn storage device. Figure 7 (B) is a diagram illustrating an example of the relationship between the detected quantity and the estimated quantity of yarn as the quantity of yarn in the yarn storage device gradually decreases.

[0034] Figure 8 (A) is a diagram illustrating an example of the relationship between the detected quantity and the estimated quantity of yarn as the quantity of yarn in the yarn storage device gradually increases. Figure 8 (B) is a diagram illustrating an example of the relationship between the detected quantity and the estimated quantity of yarn as the quantity of yarn in the yarn storage device gradually decreases.

[0035] Figure 9 (A) and Figure 9 (B) is a diagram showing the downstream position of the yarn stored on the outer periphery.

[0036] Figure 10 (A) is a diagram showing the configuration relationship between the yarn storage device and the detection unit of the winding machine unit in Modified Example 1. Figure 10 (B) is a diagram showing the configuration relationship between the yarn storage device and the detection unit of the winding machine unit in Modified Example 2.

[0037] Figure 11 This is a diagram illustrating an example of the results obtained by a modified line sensor.

[0038] Figure 12 (A) is a diagram showing the configuration relationship between the yarn storage device and the detection unit of the winding machine unit in Modified Example 3. Figure 12 (B) is a diagram showing the configuration relationship between the yarn storage device and the detection unit of the winding machine unit in Modified Example 4.

[0039] Figure 13 (A) and Figure 13 (B) is a diagram showing the configuration relationship between the yarn storage device and the detection unit of the winding machine unit in Modified Example 5. Detailed Implementation

[0040] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Furthermore, in the description of the drawings, the same or equivalent elements are labeled with the same reference numerals, and repeated descriptions are omitted. "Upstream" and "downstream" refer to the upstream and downstream directions of the yarn's travel, respectively.

[0041] like Figure 1 As shown, the automatic winding machine 1 includes multiple winding machine units (yarn take-up machines) 2 arranged in an array, a machine body control device 3, a yarn feeding bobbin supply device 4, a yarn doffing device 5, and a blower box (not shown).

[0042] The machine control device 3 is configured to communicate with each winding machine unit 2. The operator of the automatic winding machine 1 can centrally manage multiple winding machine units 2 by appropriately operating the machine control device 3. The machine control device 3 controls the operation of the yarn feeding bobbin supply device 4 and the doffing device 5.

[0043] The yarn feeding bobbin supply device 4 places the yarn feeding bobbins 21 one by one on the conveyor tray 26. The yarn feeding bobbin supply device 4 then supplies the yarn feeding bobbins 21 placed on the conveyor tray 26 to multiple winding machine units 2.

[0044] When the winding machine unit 2 has a full roll of yarn 30 (a state where a predetermined amount of yarn Y is wound), the doffing device 5 moves to the position of the winding machine unit 2 and unloads the full roll of yarn 30. The doffing device 5 then places the take-up bobbin 22 with the unwound yarn Y onto the winding machine unit 2 after the roll of yarn 30 has been unloaded.

[0045] Next, the structure of winding machine unit 2 will be explained. For example... Figure 2 As shown, the winding machine unit 2 includes a yarn feeding section (supply section) 6, a yarn storage device 40, a detection unit 50, a cover 47, a package forming section (winding section) 8, a waxing device 70, and a control section 25. In the winding machine unit 2, the yarn Y unwound from the yarn feeding bobbin 21 of the yarn feeding section 6 is temporarily stored in the yarn storage device 40. Then, the package forming section 8 pulls out the yarn Y stored in the yarn storage device 40 and winds it into the winding bobbin 22 to form a package 30.

[0046] The yarn feeding section 6 is configured to support the yarn feeding bobbin 21 placed on the conveyor tray 26 at a predetermined position and unwind the yarn Y from the yarn feeding bobbin 21. When the yarn feeding section 6 unwinds all the yarn Y from the yarn feeding bobbin 21, it discharges the core tube of the yarn feeding bobbin 21 that is not wound with yarn Y and receives a new yarn feeding bobbin 21 from the yarn feeding bobbin supply device 4.

[0047] The yarn storage device 40 is positioned midway along the yarn travel path between the yarn feed section 6 and the package forming section 8. The yarn storage device 40 is positioned upstream of the waxing device 70 in the yarn Y's travel direction. The yarn storage device 40 winds up the yarn Y unwound from the yarn feed section 6 and temporarily stores it. The yarn storage device 40 then supplies the stored yarn Y to the package forming section 8.

[0048] The yarn storage device 40 includes a storage roller 41 capable of winding yarn Y, a drive motor 45 for rotating the storage roller 41, and a cover 47. The storage roller 41 winds the yarn Y around the storage area A on the outer peripheral surface 41d of the storage roller 41 and temporarily stores the yarn Y. The storage roller 41 is supported by the body (frame) of the automatic winding machine 1 and is able to rotate around a rotation axis C1 that is slightly inclined relative to the horizontal direction. Figure 2 as well as Figure 3 As shown, tapered portions 41a and 41b, with their diameters increasing towards the ends, are formed at both ends of the accumulation roller 41. The portion between the two tapered portions 41a and 41b is a cylindrical portion 41c with a constant diameter. The outer peripheral surface 41d of the cylindrical portion 41c is the accumulation area A of the wound yarn Y. The outer peripheral surface 41d of the cylindrical portion 41c is mirror-finished. The two tapered portions 41a and 41b at both ends prevent the yarn Y wound on the cylindrical portion 41c from falling off.

[0049] A ring member 42 is wound around the outer peripheral surface 41d of the cylindrical portion 41c of the accumulation roller 41. The ring member 42 is formed into a ring shape, for example, by means of rubber. The ring member 42 is mounted at the boundary between the cylindrical portion 41c and the tapered portion 41b at the front end. The ring member 42 is a tension ring that surrounds the yarn Y pulled out from the accumulation roller 41 by the package forming portion 8 and applies resistance to the yarn Y in contact with it. The ring member 42 is mounted to the cylindrical portion 41c by an elastic force that fastens it to the radially inner side. The ring member 42 applies resistance to the yarn Y pulled out from the accumulation roller 41 by this elastic force. By means of the ring member 42, an appropriate tension is applied to the yarn Y pulled out from the accumulation roller 41, thereby stabilizing the unwinding of the yarn Y from the accumulation roller 41.

[0050] On the outer peripheral surface 41d of the accumulation roller 41, a first recess 43a is provided in the region spanning the mounting position of the ring member 42 in the direction along the rotation axis C1. That is, viewed from the radially outer side of the accumulation roller 41, the first recess 43a is positioned to pass through and intersect the mounting position of the ring member 42, and a portion of the first recess 43a overlaps with the mounting position. Here, the first recess 43a constitutes a groove extending from one end of the accumulation roller 41 to the other in the direction along the rotation axis C1. The first recess 43a has, for example, the same cross-sectional shape in the long side direction, forming a generally rectangular cross-section. A second recess 43b is also provided on the outer peripheral surface 41d of the accumulation roller 41. The second recess (recess) 43b is a recess (so-called wall thinning portion) designed to prevent the formation of a sink mark (so-called sink mark) when a boss or reinforcing rib for embedding a sensor magnet is formed on the inner circumferential surface 41g of the cylindrical portion 41c.

[0051] The drive motor 45 rotates the accumulation roller 41 in the direction of taking yarn Y from the yarn feed section 6. The drive motor 45 can also rotate the accumulation roller 41 in the opposite direction to the taking direction. The drive motor 45 is a DC brushless motor, stepper motor, servo motor, or other motor capable of position control.

[0052] A downstream yarn blowing section 80 is disposed near the tapered portion 41a on one end side (upstream side of the storage roller 41). The downstream yarn blowing section 80 is disposed close to the outer peripheral surface 41d of the storage roller 41. During normal yarn take-up, the yarn on the feed section 6 side is guided to the tapered portion 41a on one end side of the storage roller 41 by the downstream yarn blowing section 80. When the drive motor 45 is driven to rotate the storage roller 41 in one direction, the yarn Y guided to the tapered portion 41a on one end side of the storage roller 41 by the downstream yarn blowing section 80 is wound sequentially while pushing the preceding yarn layer up from one end side (upstream side) of the cylindrical portion 41c. As a result, the yarn Y already wound on the outer peripheral surface 41d of the storage roller 41 is pushed by the newly wound yarn Y and sequentially moved to the other end side (downstream side). Thus, on the outer circumferential surface of the cylindrical portion 41c of the accumulation roller 41, the yarn Y is arranged in a spiral shape and wound regularly from one end to the other end.

[0053] The yarn Y wound on the storage roller 41 is pulled out from the tapered portion 41b at the other end of the storage roller 41 (the upstream side of the storage roller 41) and conveyed downstream (towards the package forming portion 8). In the tapered portion 41b, the yarn Y on the storage roller 41 is pulled downstream via a pull-out guide 37 located on the extension line of the rotation axis C1 of the storage roller 41. The yarn Y wound on the storage roller 41 is unwound between the storage roller 41 and the aforementioned loop member 42. This applies appropriate tension to the unwound yarn Y.

[0054] The detection unit 53 is disposed near the outer peripheral surface 41d of the cylindrical portion 41c of the accumulation roller 41. For example, the detection unit 53 can detect when the yarn Y of the accumulation roller 41 becomes more than or equal to a predetermined upper limit and less than a predetermined lower limit. The detection unit 53 may also define the above-mentioned upper limit to the above-mentioned lower limit as the detection range. In addition, the detection range may be set to a wider range including the portion exceeding the above-mentioned upper limit and the portion less than the above-mentioned lower limit. Thus, for example, it is possible to detect the amount exceeding the above-mentioned upper limit. In this embodiment, the case where the yarn Y of the accumulation roller 41 becomes more than or equal to a predetermined upper limit and less than the predetermined lower limit is detected from the detection range. In addition, the above-mentioned "more than" and "less than" can be appropriately set to "exceeding" and "below". The detection result of the detection unit 53 is obtained by the control unit 25. The control unit 25 controls the drive motor 45 based on the detection result of the detection unit 53 so that the accumulation amount (winding amount) of the accumulation roller 41 converges between the above-mentioned upper limit and the above-mentioned lower limit.

[0055] The detection unit 53 detects the yarn Y wound on the outer peripheral surface 41d of the storage roller 41. For example... Figure 4 (A)~ Figure 4As shown in (C), the detection unit 53 and the light-emitting unit 55 that emits light toward the accumulation roller 41 together form the detection unit 50. That is, the detection unit 50 is configured to include the detection unit 53 and the light-emitting unit 55. The detection unit 53 and the light-emitting unit 55 are housed in the frame 51 and fixed to the body of the automatic winding machine 1.

[0056] The detection unit 53 includes a line sensor 53A and a lens 53B that reduces incident light. The detection area of ​​the line sensor 53A is a straight section S1 in the accumulation area A, which connects the end 41f of the upstream accumulation area A in the direction of travel of yarn Y and the end 41e of the downstream accumulation area A in the direction of travel of yarn Y. The line sensor 53A detects the presence or absence of yarn Y in the straight section S1. In the example of the line sensor 53A, a CCD image sensor or a CMOS image sensor is used to obtain light by arranging photodiodes in a row. The line sensor 53A receives light via the lens 53B that reduces incident light. In this embodiment, the line sensor 53A is arranged so that the extension direction of the straight section S1 is parallel to the extension direction of the rotation axis C1, but it can also be arranged so that the extension direction of the straight section S1 intersects the extension direction of the rotation axis C1.

[0057] The light-emitting unit 55 has two light sources 55B and 55B, and a light waveguide 55C that converts the light emitted from the two light sources 55B and 55B into surface-emitting light and emits it toward the storage roller 41. A diffuser plate, such as an acrylic plate, is included as part of the components of the light waveguide 55C to guide the light. An example of the two light sources 55B and 55B is an LED (Light Emitting Diode), which is disposed on an LED substrate 55A. However, the number of light sources is not limited to two.

[0058] The line sensor 53A is positioned such that light from the light-emitting part 55 reflected by the outer peripheral surface 41d of the accumulation roller 41 is not incident, but light from the light-emitting part 55 reflected by the yarn Y stored in the accumulation roller 41 is incident. For example, as Figure 4 As shown in (C), the line sensor 53A emits light at an illumination angle θ ranging from 0° to 30°. "Configuring the line sensor 53A such that light from the light-emitting unit 55 reflected by the outer peripheral surface 41d of the accumulation roller 41 does not occur" means that the line sensor 53A is positioned at a position where the light emitted from the light-emitting unit 55 at the aforementioned angle is totally reflected by the outer peripheral surface 41d of the accumulation roller 41, and the light reflected by the outer peripheral surface 41d of the accumulation roller 41 does not occur.

[0059] Here, one of the straight lines orthogonal to the rotation axis C1 is hypothetically designated as the first straight line L1, and one of the straight lines parallel to the first straight line L1 and tangent to the outer peripheral surface 41d of the accumulation roller 41 is hypothetically designated as the second straight line L2. In this embodiment, viewed from above in the direction extending from the rotation axis C1 of the accumulation roller 41, the light-emitting part 55 is disposed on the first straight line L1, or disposed between the line sensor 53A and the first straight line L1 in the arrangement direction of the first straight line L1 and the second straight line L2. Thus, the light-emitting part 55 can emit light to a portion of the accumulation roller 41 located between the first straight line L1 and the second straight line L2. The line sensor 53A is disposed between the second straight line L2 and the first straight line L1. The light-receiving direction of the line sensor 53A is approximately parallel to the first straight line L1. In other words, light is incident on the line sensor 53A from a direction approximately parallel to the first straight line L1. The cover 47 is disposed in the region opposite to the side where the first straight line L1 is disposed in the arrangement direction of the first straight line L1 and the second straight line L2.

[0060] The cover 47 is positioned opposite a portion of the outer peripheral surface 41d of the storage roller 41. The cover 47 is positioned in at least a portion of the direction of travel of light from the light-emitting part 55 that is reflected by the outer peripheral surface 41d of the storage roller 41. Alternatively, the cover 47 may be positioned in at least a portion of the direction of travel of light from the light-emitting part 55 that is not reflected by the outer peripheral surface 41d of the storage roller 41. At least a portion of the portion of the cover 47 where light from the light-emitting part 55 is incident, i.e., the opposing surface 47a, is formed with a color that reduces light reflectivity (e.g., black). By reducing reflectivity in this way, reflected light from the cover 47 can be prevented from incident on the storage roller 41. This prevents the light reflected from the yarn Y from being inappropriately detected because the yarn sensor 53A detects light reflected by the cover 47.

[0061] Furthermore, even without the cover 47, the periphery of the yarn storage device 40 can be configured such that no reflective light structure is provided in the direction of light travel from the light-emitting unit 55. Even assuming that a reflective light structure is provided in the direction of light travel from the light-emitting unit 55, if the structure is provided at a position where the reflected light sufficiently attenuates when it reaches the yarn sensor 53A, it is possible to prevent the light reflected from the yarn Y from not being properly detected.

[0062] like Figure 1 as well as Figure 2 As shown, the package forming section 8 includes a cradle 23 configured to mount a take-up bobbin 22, and a traversing roller 24 that drives the take-up bobbin 22 while traversing the yarn Y. The package forming section 8 constitutes a take-up section. The cradle 23 supports the take-up bobbin 22 (or package 30) so that it can rotate. The cradle 23 is configured to allow the outer peripheral surface of the supported package 30 to contact the outer peripheral surface of the traversing roller 24.

[0063] The traverse roller 24 is driven to rotate by a drive source (such as an electric motor, not shown in the diagram). It rotates while in contact with the outer peripheral surface of the take-up bobbin 22 or the package 30, causing the take-up bobbin 22 to rotate. This allows the yarn Y stored in the yarn storage device 40 to be unwound and pulled out, and then wound onto the take-up bobbin 22. A traverse groove (not shown in the diagram) is formed on the outer peripheral surface of the traverse roller 24. For the yarn Y, the traverse groove allows the yarn Y to traverse (move laterally) at a predetermined width. In this configuration, by traversing the yarn Y while winding it onto the take-up bobbin 22, a package 30 of a predetermined shape can be formed.

[0064] The waxing device 70 is disposed between the yarn storage device 40 and the package forming section 8. The waxing device 70 waxes the yarn Y that travels from the yarn storage device 40 toward the package forming section 8.

[0065] The winding machine unit 2 is equipped with various devices in the yarn travel path from the yarn feeding section 6 through the yarn storage device 40 to the package forming section 8. Specifically, in the yarn channel (yarn travel path) of yarn Y, from the upstream yarn feeding section 6 side to the downstream yarn storage device 40 side, the following are arranged in sequence: unwinding assist device 10, yarn unwinding detector 11, tension application section 12, capturing device 13, splicing device 14, yarn monitoring device 16, and downstream yarn blowing section 80.

[0066] The unwinding assist device 10 makes the movable part 27 contact the air ring formed on the upper part of the yarn feed tube 21 as the yarn Y is unwound from the yarn feed tube 21. The size of the air ring is appropriately controlled, thereby assisting the unwinding of the yarn Y.

[0067] The yarn detection detector 11 is positioned downstream of the unwinding aid 10, close to the unwinding aid 10. The yarn detection detector 11 determines the presence or absence of yarn Y supplied from the unwinding aid 10.

[0068] The tension applying unit 12 applies a predetermined tension to the traveling yarn Y. The tension applying unit 12 applies the predetermined tension to the yarn Y based on the tension detected by a tension sensor (not shown). The tension applying unit 12 is configured as a barrier type with movable comb teeth arranged relative to fixed comb teeth. The tension applying unit 12 applies a predetermined resistance by causing the yarn Y to travel between the comb teeth. The movable comb teeth are configured to be movable via, for example, a solenoid, so that the comb teeth are in an engaged or disengaged state. Thus, the tension applying unit 12 can adjust the tension applied to the yarn Y. Furthermore, the configuration of the tension applying unit 12 is not particularly limited; for example, it could also be a disc-type tension applying unit.

[0069] The capturing device 13 is disposed downstream of the tension applying part 12. The capturing device 13 has a first capturing part 13A and a second capturing part 13B. In this embodiment, the first capturing part 13A and the second capturing part 13B are integrated into one component. The first capturing part 13A and the second capturing part 13B are respectively connected to a negative pressure source (not shown).

[0070] The first capturing part 13A is configured as a cylindrical component with an opening at its front end. When splicing, the first capturing part 13A generates an airflow to attract and capture the yarn Y on the side of the yarn storage device 40.

[0071] The second capturing part 13B is configured as a cylindrical component with an opening at its front end. The second capturing part 13B is configured to be oscillating. The second capturing part 13B is positioned at the first position (capturing position) when capturing the yarn Y supplied from the unwinding assist device 10. Figure 2 The position shown by the solid line in the middle) and the guide position (second position) that guides the yarn Y-direction splicing device 14 ( Figure 2 It swings between the positions shown by the dashed line. The capture position can also be the standby position of the second capture unit 13B.

[0072] When the second capturing unit 13B is in the capturing position, near the yarn channel downstream of the yarn detector 11, it generates an attractive airflow at its front end, thereby attracting and capturing the yarn end from the feed bobbin 21. When the yarn Y is cut by the cutter 15, the second capturing unit 13B attracts and captures the cut yarn end of the yarn Y on the feed bobbin 21 side. Furthermore, the second capturing unit 13B can also be configured to attract and remove fly waste and other debris adhering to the traveling yarn Y by generating an attractive airflow at its front end.

[0073] An auxiliary blowing section 28 is provided. When the yarn Y is captured by the second capturing section 13B, after a new yarn feeding bobbin 21 has just been supplied to the yarn feeding section 6, the auxiliary blowing section 28 blows the yarn end to a position downstream of the yarn detector 11 (the front end of the second capturing section 13B).

[0074] The auxiliary blowing unit 28 sprays compressed air into the hollow conveying tray 26 and the inside of the yarn feeding bobbin 21, forming an airflow at the front end of the yarn feeding bobbin 21 that blows the yarn Y of the yarn feeding bobbin 21 toward the lower yarn detector 11. When a newly supplied yarn feeding bobbin 21 is supported by the yarn feeding unit 6, the auxiliary blowing unit 28 operates, thereby reliably conveying the yarn end on the side of the yarn feeding bobbin 21 toward the lower yarn detector 11.

[0075] The splicing device 14 splices disconnected yarn Y. When yarn Y is cut by the cutter 15 due to a yarn defect detected by the yarn monitoring device 16, when yarn Y breaks while unwinding from the feed bobbin 21, or when the feed bobbin 21 is replaced, etc., and the yarn Y is in a disconnected state between the feed bobbin 21 and the yarn storage device 40, the splicing device 14 splices the yarn Y on the feed bobbin 21 side to the yarn storage device 40 side. The splicing device 14 is positioned slightly retracted from the yarn channel. The splicing device 14 can connect the introduced yarn ends to each other, making the yarn Y continuous. The splicing device 14 can be a fluid device using compressed air or a mechanical device.

[0076] The yarn monitoring device 16 monitors the thickness of yarn Y using appropriate sensors, thereby detecting yarn defects such as thick yarns and foreign matter contamination. A cutter 15 is positioned upstream of the yarn monitoring device 16, close to it. The cutter 15 immediately cuts the yarn Y upon detection of a yarn defect by the yarn monitoring device 16. The cutter 15 and the yarn monitoring device 16 are housed in a common housing 19. The housing 19 housing the yarn monitoring device 16 is located downstream of the splicing device 14.

[0077] The downstream yarn blowing unit 80 is an air suction device located upstream of the yarn storage device 40, close to the yarn storage device 40. The downstream yarn blowing unit 80 ejects compressed air to form an airflow that attracts the yarn end present in the storage area A of the storage roller 41 on the side of the yarn storage device 40 and blows it away, conveying it to the first capturing unit 13A. Specifically, the downstream yarn blowing unit 80 includes a thin, cylindrical guide member (not shown) that allows yarn Y to pass through, and a curved, cylindrical member, namely the yarn guide member 60. An outlet for yarn Y is formed at one end of the guide member. The yarn guide member 60 is positioned close to the outlet of the downstream yarn blowing unit 80. Openings are formed at both ends of the yarn guide member 60 along its long side.

[0078] The yarn guiding member 60 is configured such that the opening at one end of the yarn guiding member 60 faces the outlet of the downstream yarn blowing unit 80, and the opening at the other end of the yarn guiding member 60 faces the first capturing unit 13A. A guiding path is formed inside the yarn guiding member 60. The guiding path connects the openings at both ends of the yarn guiding member 60 to each other in a manner that bypasses the yarn monitoring device 16 and the splicing device 14. The downstream yarn blowing unit 80, the yarn guiding member 60, and the first capturing unit 13A together form a storage-side yarn end capturing device 75.

[0079] When the yarn Y is disconnected between the yarn feed tube 21 and the yarn storage device 40, the downstream yarn blowing unit 80 captures the yarn Y on the yarn storage device 40 side and blows it along the guide path of the yarn guiding member 60. Then, the downstream yarn blowing unit 80 pulls the yarn Y along the guide path, causing the first capturing unit 13A to capture the yarn Y. A through-type slit (not shown) is formed along the entire length of the yarn guiding member 60, so that when the first capturing unit 13A captures the yarn Y, the yarn Y can be pulled out from inside the yarn guiding member 60. Based on the above description, the yarn Y on the yarn storage device 40 side can be blown by the downstream yarn blowing unit 80 and guided towards the splicing device 14 side.

[0080] Each winding machine unit 2 includes a control unit 25. The control unit 25 includes hardware such as a CPU, ROM, and RAM (not shown in the diagram). Software, including control programs, is stored in the RAM. The control unit 25 controls each component of the winding machine unit 2 through the cooperation of the hardware and software. The control unit 25 is configured to communicate with the machine control device 3. Therefore, the operation of the multiple winding machine units 2 included in the automatic winding machine 1 can be centrally managed in the machine control device 3.

[0081] In this embodiment, the control unit 25 determines whether the yarn Y is present in the outer peripheral surface 41d (storage area A) of the accumulation roller 41. The control unit 25 determines the presence or absence of the yarn Y on the outer peripheral surface 41d based on the detection result of the thread sensor 53A. Figure 5 (A) is a diagram showing the planar unfolding of the outer peripheral surface 41d of the accumulation roller 41 in a manner that repeats in a portion of the rotational direction. Line sensor 53A detects... Figure 5 The presence or absence of yarn Y within the range R shown in (A). More specifically, the control unit 25 rotates the accumulation roller 41 at a low speed (less than 200 rpm) for one revolution, and determines the presence or absence of yarn Y on the outer peripheral surface 41d based on the detection result of the thread sensor 53A when the accumulation roller 41 rotates for one revolution.

[0082] Alternatively, the accumulation roller 41 can be rotated at a high speed (200 rpm or more) for one revolution, and the presence or absence of yarn Y on the outer peripheral surface 41d can be determined based on the detection result of the thread sensor 53A when the accumulation roller 41 rotates for one revolution. In the thread sensor 53A of this embodiment, the influence of the first recess 43a and the second recess 43b on the reflected light is reduced in the high-speed rotating accumulation roller 41. Therefore, the amount of accumulation can be detected by ignoring the reflected light generated by the first recess 43a and the second recess 43b. In this case, as Figure 5As shown in (C), in the densely packed section YC of yarn Y, there is more reflected light, making it easier to detect by the thread sensor 53A. On the other hand, in the section Y1 of a single yarn pulled out from the densely packed section YC, there is less reflected light, making it difficult to detect by the thread sensor 53A.

[0083] For example, such as Figure 4 As shown in (C), when yarn Y is present on the outer peripheral surface 41d of the accumulation roller 41, the control unit 25 causes the light emitted from the light-emitting unit 55 to be reflected towards the cover 47 side even if it is reflected by the outer peripheral surface 41d, as described above. Instead, when yarn Y is present on the outer peripheral surface 41d, the light reflected by the yarn Y is reflected towards the thread sensor 53A side, and the reflected light is detected by the thread sensor 53A.

[0084] The detection result of the line sensor 53A at this time is, for example, as... Figure 6 The data shown is obtained by the control unit 25. Figure 6 In the data shown, areas where light is detected relatively frequently, i.e., areas that appear white when converted to a BMP image, represent areas where yarn (white yarn) Y is detected. Areas where light is detected relatively infrequently, i.e., areas that appear black when converted to a BMP image, represent areas where yarn (white yarn) Y is not detected. The pixel position in the detection result of the line sensor 53A represents the position within the straight line interval S1. That is, based on the detection result of the line sensor 53A, the control unit 25 can determine where yarn Y is present and where yarn Y is absent within the straight line interval S1. In this way, the control unit 25 can accurately detect the amount of light detected by the line sensor 53A. Figure 5 The presence or absence of yarn Y within the range R shown in (B).

[0085] As described above, the outer peripheral surface 41d of the accumulation roller 41 in this embodiment has a first recess 43a and a second recess 43b. The control unit 25 determines that the accumulation roller 41 has rotated one revolution by detecting one revolution of the first recess 43a, which serves as a reference. The control unit 25 can determine the positions of the first recess 43a and the second recess 43b by adjusting the rotation of the motor and by setting marks (e.g., magnetic marks) at the locations of the recesses. However, the light reflected by the first recess 43a and the second recess 43b may sometimes be reflected towards the yarn sensor 53A. In this case, even if the control unit 25 detects the presence or absence of yarn Y based on the detection result of the yarn sensor 53A, it cannot perform accurate detection.

[0086] Therefore, in this embodiment, the control unit 25 determines the presence or absence of yarn Y on the outer peripheral surface 41d based on the detection results of the thread sensors 53A at different positions than those of the first recess 43a and the second recess 43b. More specifically, the control unit 25 determines the presence or absence of yarn Y on the outer peripheral surface 41d based on the detection results of the thread sensors 53A in all areas where the first recess 43a and the second recess 43b are not formed. More specifically, as... Figure 5 As shown in (C), a plurality of recesses (first recess 43a and second recess 43b) are formed on the outer peripheral surface 41d of the accumulation roller 41 along the rotation direction of the accumulation roller 41. Furthermore, a plurality of regions between adjacent recesses in the rotation direction, namely connecting portions 41h, are formed on the outer peripheral surface 41d of the accumulation roller 41. The control unit 25 determines whether there is yarn Y in the accumulation region A based on the detection results of the thread sensor 53A in at least a portion of the region of each of the plurality of connecting portions 41h.

[0087] The control unit 25 can also acquire data via the thread sensor 53A in areas where the first recess 43a and the second recess 43b are absent, while the rotation of the accumulation roller 41 is stopped. The control unit 25 can determine the positions where the first recess 43a and the second recess 43b are absent by adjusting the motor rotation and by setting markers (e.g., magnetic marks) at the recess locations. In other words, the control unit 25 can acquire data via the thread sensor 53A while intermittently rotating the accumulation roller 41. Furthermore, the control unit 25 can rotate the accumulation roller 41 at a low speed, thereby performing detection only at necessary locations. Additionally, the control unit 25 can rotate the accumulation roller 41 while continuously detecting via the thread sensor 53A, avoiding the process of determining the presence or absence of yarn Y on the outer peripheral surface 41d only at the locations of the first recess 43a and the second recess 43b.

[0088] Next, the method for determining whether yarn sluffing has occurred by the control unit 25 will be explained. The control unit 25 infers information related to the yarn Y stored in the accumulation roller 41 based on the amount of yarn Y supplied from the yarn feed unit 6 and the amount of yarn Y wound by the package forming unit 8. Then, based on the inferred information related to the yarn Y and the detection result of the yarn sensor 53A, the control unit 25 determines whether the yarn Y is uniformly wound on the outer peripheral surface 41d. Examples of information related to the yarn stored in the accumulation roller 41 include the accumulation amount, the length of the yarn, and the width of the area on the outer peripheral surface 41d where the yarn Y is wound. The control unit 25 infers information related to the yarn Y stored in the accumulation roller 41 based on the average value of the difference between the rotational speed of the accumulation roller 41 and the rotational speed of the take-up bobbin 22. Furthermore, for example, information related to the yarn Y stored in the accumulation roller 41 can be inferred based on the value obtained by multiplying the time when yarn Y is detected by the yarn monitoring device 16 or the unwinding detector 11 by the yarn speed (unwinding speed), and the value obtained by multiplying the detection time of a sensor located downstream of the accumulation roller 41 by the yarn speed (winding speed). Additionally, since the yarn speed in this case is not always constant, it is preferable to set it to an average speed.

[0089] Specific examples of situations where the yarn Y is not evenly wound on the outer peripheral surface 41d include yarn breakage and yarn clumps. Yarn breakage refers to a state where the yarn Y is not steadily unwound from the storage roller 41, but rather several layers of yarn Y are tangled together and unwound all at once, like a loop coming off. Yarn clumps refer to a state where the yarn Y wound on the outer peripheral surface 41d of the storage roller 41 is not evenly formed along the rotation axis C1 of the storage roller 41, but is wound in an overlapping state in a direction orthogonal to the rotation axis C1 of the storage roller 41.

[0090] like Figure 7 As shown in (A), during the gradual increase of the yarn Y storage amount V in the yarn storage device 40, when the difference D between the detected storage amount C and the estimated storage amount S is greater than the yarn breakage determination storage amount T1, the control unit 25 determines the yarn breakage determination storage amount. Figure 7 The portion enclosed in the circle in (A) is determined to be a yarn breakage in the yarn storage device 40. More specifically, if it only exceeds the threshold once, it may be a false detection. Therefore, if multiple consecutive detections (e.g., 3 consecutive detections) or multiple detections within a specified period (e.g., two out of 3 detection opportunities exceeding the threshold, but not necessarily two consecutive detections) are detected, it is determined to be a yarn breakage. Of course, it is also possible to determine a yarn breakage even if it is detected only once.

[0091] The estimated accumulation amount S refers to the accumulation amount V of yarn Y, which is information related to yarn Y. The detected accumulation amount C refers to the accumulation amount V of yarn Y calculated based on the detection result of the yarn sensor 53A. A difference D greater than the yarn breakage judgment accumulation amount T1 means that the actual winding width is greater than the width of the yarn Y wound uniformly on the outer peripheral surface 41d of the accumulation roller 41. That is, it can be determined that yarn breakage has occurred. Furthermore, as... Figure 7 As shown in (B), during the gradual decrease of the yarn Y storage amount V in the yarn storage device 40, when the difference D between the detected storage amount C and the estimated storage amount S is greater than the yarn breakage determination storage amount T1, the control unit 25 determines the yarn breakage determination storage amount T1. Figure 7 The portion enclosed by the circle in (B) is determined to be a yarn breakage that occurs in the yarn storage device 40. The reasoning for this determination is the same as when the amount V of yarn Y stored in the yarn storage device 40 gradually increases.

[0092] More specifically, the estimated storage amount S is the average of the differences between the rotational speed of the storage roller 41 and the rotational speed of the take-up bobbin 22 over a certain period, multiplied by time. Alternatively, the difference D can be calculated based on the detection results of the yarn sensor 53A and the storage height of the yarn Y stored in the storage roller 41. The storage height can be calculated by dividing the estimated storage amount S by the circumference of the storage roller 41, calculating the number of turns of the yarn Y relative to the storage roller 41, and then multiplying that number of turns by the thickness of the yarn Y.

[0093] Alternatively, the control unit 25 can replace the aforementioned yarn breakage detection method, and based on the detection results of the yarn sensor 53A, when from Figure 8 The state of (A) becomes Figure 8 When the amount of movement per unit time of the yarn Y at the downstream position YP of the yarn Y stored on the outer peripheral surface 41d in state (B) is greater than the yarn breakage determination movement T2, it is determined that a yarn breakage has occurred in the yarn storage device 40.

[0094] Next, the method by which the control unit 25 determines whether a yarn block has been generated will be explained. For example... Figure 9 As shown in (A), during the gradual increase of the yarn Y storage volume V in the yarn storage device 40, when the difference D between the estimated storage volume S and the detected storage volume C is greater than the storage volume T3 determined by the yarn block section, that is, for Figure 9The portion enclosed by the circle in (A) is determined by the control unit 25 to be a yarn block formation in the yarn storage device 40. More specifically, if the value exceeds the threshold only once, it may be a false detection. If multiple consecutive detections (e.g., 3 consecutive detections) or multiple detections within a specified period (e.g., two out of 3 detection opportunities exceeding the threshold, but not necessarily two consecutive detections) are detected, it is determined to be a yarn block formation. Of course, it is also possible to determine that a yarn block formation is generated even if it is detected only once.

[0095] The difference D being greater than the yarn block accumulation amount T3 means that the actual winding width is less than the width of the yarn Y wound evenly on the outer peripheral surface 41d of the accumulation roller 41. That is, it can be determined that a yarn block has been generated. Furthermore, as... Figure 9 As shown in (B), during the gradual decrease of the yarn Y storage amount V in the yarn storage device 40, when the difference D between the estimated storage amount S and the detected storage amount C is greater than the storage amount T3 determined by the yarn block section, that is, for Figure 9 The portion enclosed by the circle in (B) is determined to be a section where a yarn block is generated in the yarn storage device 40. The reason for determining that this is a section where a yarn block is generated is the same as when the amount of yarn Y stored in the yarn storage device 40 gradually increases.

[0096] The effects of the winding machine unit 2 in the above embodiment will be explained. In the winding machine unit 2 of the above embodiment, as... Figure 4 As shown in (A), the yarn sensor 53A that detects the yarn Y wound on the outer peripheral surface 41d of the accumulation roller 41 is composed of a yarn sensor 53A that detects whether there is yarn in the straight section S1 connecting the upstream end and the downstream end in the yarn travel direction in the outer peripheral surface 41d (accumulation region A). Therefore, it is not necessary to install sensors to detect the presence or absence of yarn Y at various locations in the accumulation region A; the presence or absence of yarn Y in the aforementioned straight section S1 in the accumulation region A can be detected. As a result, the amount V of yarn Y wound on the yarn accumulation device 40 can be detected cheaply with a simple configuration.

[0097] In the winding machine unit 2 of the above embodiment, as Figure 4 As shown in (B), it has a light-emitting part 55 that emits light toward the storage roller 41. As a result, the intensity (contrast) of the light received by the yarn sensor 53A can be assigned, and the detection accuracy of the control unit 25 for the yarn Y can be improved.

[0098] like Figure 4As shown in (B), the light-emitting unit 55 of the winding machine unit 2 in the above embodiment has two light sources 55B, 55B and a light waveguide 55C that converts the light emitted from the two light sources 55B, 55B into surface-emitting light and emits it toward the storage roller 41. Therefore, the light emitted from the light-emitting unit 55 can be made uniform. As a result, the accuracy of detecting yarn Y can be improved. In addition, as Figure 4 As shown in (A), the wire sensor 53A of the winding machine unit in the above embodiment is configured to receive light via a lens 53B that reduces the incident light, thus allowing the detection unit 53 to be compactly arranged.

[0099] like Figure 4 As shown in (C), the yarn sensor 53A of the winding machine unit 2 in the above embodiment is positioned such that light from the light-emitting part 55 reflected by the outer peripheral surface 41d of the accumulation roller 41 is not incident, while light from the light-emitting part 55 reflected by the yarn Y stored in the accumulation roller 41 is incident. This improves the detection accuracy of white yarn Y, where light is easily reflected by the yarn Y wound around the accumulation roller 41. Specifically, in the configuration of the winding machine unit 2 in the above embodiment, the presence or absence of yarn Y is detected based solely on reflected light from the yarn Y stored in the accumulation roller 41. This reduces the amount of light reflected from parts other than the yarn Y that incident on the yarn sensor 53A, thus improving the detection accuracy of yarn Y.

[0100] In the yarn storage device 40 of the winding machine unit 2 in the above embodiment, such as Figure 4 As shown in (C), a cover 47 is provided opposite a portion of the outer peripheral surface 41d of the accumulation roller 41. This cover 47 is positioned in a portion of the direction of travel of light from the light-emitting unit 55 reflected by the outer peripheral surface 41d of the accumulation roller 41. This suppresses the scattering of fly shavings generated in the accumulation roller 41, or controls the airflow generated by the rotation of the accumulation roller 41 to prevent the yarn end from contacting the periphery. Furthermore, the opposing surface 47a of the cover 47 where light from the light-emitting unit 55 is incident is black, thus absorbing the light from the light-emitting unit 55 reflected by the outer peripheral surface 41d of the accumulation roller 41. This reduces the amount of light (interference light) reflected from parts other than the yarn Y that incident on the yarn sensor 53A, thereby improving the detection accuracy of the yarn Y by the control unit 25.

[0101] In the above-described embodiment, the control unit 25 of the winding machine unit 2 rotates the accumulation roller 41 at least once, and determines whether there is yarn Y in the accumulation area A based on the detection result of the yarn sensor 53A when the accumulation roller 41 rotates once. Therefore, it is possible to detect whether there is yarn Y in all areas constituting the outer peripheral surface 41d of the accumulation roller 41, thus improving the detection accuracy of yarn Y by the control unit 25.

[0102] In the winding machine unit 2, when a defect is found in yarn Y and the yarn Y stored in the storage roller 41 is unwound or removed, some yarn Y may remain on the storage roller 41. If splicing begins while yarn Y remains and new yarn Y is stored on the storage roller 41, the yarn Y may become tangled or break. In the winding machine unit 2 of the above embodiment, the operation of storing yarn Y on the storage roller 41 can be prohibited when the control unit 25 confirms the presence of yarn Y. In this case, the operation of storing yarn Y on the storage roller 41 while yarn Y remains on the storage roller 41 can be prevented from happening, thus suppressing the tangling of yarn Y or the occurrence of yarn breakage in the winding machine unit 2. Furthermore, it is also possible to configure the machine to notify the operator when the control unit 25 confirms the presence of yarn Y.

[0103] In the above-described embodiment, the control unit 25 of the winding machine unit 2 determines that the accumulation roller 41 has rotated one revolution by detecting one revolution of the first recess 43a, which serves as a reference. Thus, the control unit 25 can determine one revolution of the accumulation roller 41 using a simple method.

[0104] The control unit 25 of the winding machine unit 2 in the above embodiment determines whether there is yarn Y in the storage area A based on the detection results of the thread sensor 53A at different positions from the first recess 43a and the second recess 43b. Therefore, by detecting or not detecting the first recess 43a and the second recess 43b by the thread sensor 53A, the possibility of the control unit 25 erroneously determining the presence or absence of yarn Y can be reduced.

[0105] The control unit 25 of the winding machine unit 2 in the above embodiment determines whether there is yarn Y in the storage area A based on the detection results of the thread sensors 53A at all positions where the first recess 43a and the second recess 43b are not formed. As a result, the detection accuracy of yarn Y can be improved in the storage roller 41 where the first recess 43a and the second recess 43b are formed on the outer peripheral surface 41d.

[0106] In the above-described embodiment, the control unit 25 of the winding machine unit 2 determines whether the yarn Y is being wound uniformly in the accumulation region A based on information related to the yarn accumulated in the accumulation roller 41 (estimated accumulation amount S) estimated from the amount of yarn Y supplied from the yarn feeding unit 6 and the amount of yarn Y wound by the package forming unit 8, as well as the detection result of the yarn sensor 53A. Thus, it is possible to determine whether the yarn Y is being wound uniformly in the accumulation region A with a simple configuration. Furthermore, the control unit 25 estimates information related to the yarn Y accumulated in the accumulation roller 41 (estimated accumulation amount S) based on the average value of the difference between the rotational speed of the accumulation roller 41 and the rotational speed of the take-up bobbin 22. Therefore, it is possible to accurately estimate information related to the yarn Y accumulated in the accumulation roller 41.

[0107] like Figure 7 (A) and Figure 7 As shown in (B), in the above embodiment, when the difference D between the detected accumulation amount C and the estimated accumulation amount S is greater than the yarn breakage determination accumulation amount T1, the control unit 25 determines that yarn breakage has occurred in the yarn accumulation device 40. Therefore, the occurrence of yarn breakage in the accumulation roller 41 can be determined with a simple configuration.

[0108] like Figure 8 (A) and Figure 8 As shown in (B), the control unit 25 of the winding machine unit 2 in the above embodiment determines that yarn breakage has occurred in the yarn storage device 40 when the movement amount per unit time of the downstream position YP of the yarn Y stored in the storage area A is greater than the yarn breakage determination movement amount T2, based on the detection result of the yarn sensor 53A. In this case, yarn breakage can also be determined to occur in the storage roller 41 by a simple configuration.

[0109] In the winding machine unit 2, if yarn breakage occurs, the tension variation of yarn Y increases, or yarn Y cannot be properly unwound from the storage roller 41, increasing the likelihood of yarn breakage. In the winding machine unit 2 of the above embodiment, when yarn breakage is confirmed by the control unit 25, yarn breakage can be prevented by performing tension control or speed control of yarn Y. Alternatively, the control unit 25 may be configured to notify the operator when yarn breakage is confirmed.

[0110] like Figure 8 (A) and Figure 8 As shown in (B), in the above embodiment, when the difference D between the estimated accumulation amount S and the detected accumulation amount C is greater than the yarn block determination accumulation amount T3, the control unit 25 determines that a yarn block has been generated in the yarn accumulation device 40. Therefore, the situation where a yarn block is generated in the accumulation roller 41 can be determined with a simple configuration.

[0111] In the winding machine unit 2, if a yarn lump is generated, it can cause the aforementioned yarn breakage or prevent the yarn Y from being properly unwound from the accumulation roller 41, increasing the likelihood of yarn breakage. In the winding machine unit 2 of the above embodiment, when the control unit 25 confirms the presence of a yarn lump, the rotation of the accumulation roller 41 is stopped, and control is executed to take up the yarn lump via the package forming unit 8 located downstream of the accumulation roller 41, thereby preventing the aforementioned yarn breakage. Alternatively, it can be configured such that when the control unit 25 confirms the generation of a yarn lump, the operator is notified of the situation. Furthermore, when yarn breakage occurs, the same control as when a yarn lump is generated can be used to take up the broken portion of the yarn via the package forming unit 8.

[0112] The above description describes one embodiment, but one aspect of the present invention is not limited to the above embodiment. Various modifications can be made without departing from the spirit of the invention.

[0113] (Variation Example 1) In the winding machine unit 2 of the above embodiment, as Figure 4 As shown in (C), an example has been given where the yarn sensor 53A is positioned such that light from the light-emitting part 55 reflected by the outer peripheral surface 41d of the accumulation roller 41 does not enter the sensor, but light from the light-emitting part 55 reflected by the yarn Y stored in the accumulation roller 41 enters the sensor. However, this is not a limitation. For example, as Figure 10 As shown in (A), the line sensor 53A can also be positioned at the point where light from the light-emitting part 55 is incident, reflected by the outer peripheral surface 41d of the accumulation roller 41. In the configuration of Modified Example 1, the detection accuracy of yarn Y, which is difficult to reflect light from the yarn Y wound on the accumulation roller 41, especially black (colored) yarn Y, can be improved.

[0114] In detail, for example, the control unit 25 is configured such that when yarn Y is present on the outer peripheral surface 41d of the accumulation roller 41, the light emitted from the light-emitting unit 55 is absorbed by the yarn Y and not reflected towards the yarn sensor 53A. On the other hand, when yarn Y is not present on the outer peripheral surface 41d of the accumulation roller 41, the light reflected by the outer peripheral surface 41d is reflected towards the yarn sensor 53A, and the reflected light is detected by the yarn sensor 53A.

[0115] The detection result of the line sensor 53A at this time is, for example, as... Figure 11 The data shown is obtained by the control unit 25. Figure 11 In the data shown, areas where light was detected relatively frequently, i.e., areas that appeared as white images when converted to BMP images, represent areas where no yarn (black yarn) was detected. Areas where light was detected relatively infrequently, i.e., areas that appeared as black images when converted to BMP images, represent areas where yarn (black yarn) was detected.

[0116] (Variation Example 2) In Modification Example 1, an example was given where the light-emitting part 55 was positioned between the accumulation roller 41 and the cover 47. However, as a countermeasure against fly waste, considering the control of airflow generated by the rotation of the accumulation roller 41 (aiming for the same flow in any direction) and the collision between the yarn ends and the surrounding area, there is a situation where it is best to avoid placing unnecessary items between the accumulation roller 41 and the cover 47. Therefore, as Figure 10 As shown in (B), a slit 47b can also be provided in the cover 47 so that light from the light-emitting part 55 is incident on the accumulation roller 41 through the slit 47b, and the light from the light-emitting part 55 reflected by the outer peripheral surface 41d of the accumulation roller 41 is incident on the line sensor 53A.

[0117] (Variation Example 3) The above-described embodiments are suitable for using white yarn Y with relatively high reflectivity, while the above-described modifications 1 and 2 are suitable for using black (colored) yarn Y with relatively low reflectivity. In modification 3, an example of a configuration suitable for situations where it is desired to use both white yarn Y and black (colored) yarn Y will be described. For example, in the above-described embodiment, which includes a light-emitting unit 55 for detecting white yarn Y (i.e., a light-emitting unit 552 (55) for white yarn), the light-emitting unit 55 for detecting black (colored) yarn Y (i.e., a light-emitting unit 551 (55) for colored yarn) of modification 2, and a cover 47, can be added. Thus, it is also possible to configure a single detection unit 53 to detect both white yarn Y and black (colored) yarn Y. However, with this configuration, when detecting white yarn Y, light emitted from the light-emitting unit 551 of the colored yarn in the above embodiment sometimes enters the slit 47b, adversely affecting the detection results of the detection unit 53 (causing false detection). Therefore, in Modification 3, as... Figure 12 As shown in (A), the configuration is as follows: a door 48 is provided in the slit 47b, and the door 48 is opened and closed by an actuator (cylinder or solenoid, etc.). Furthermore, the control unit 25 controls the actuator so that the door 48 is opened when a black (colored) yarn Y is detected, and the door 48 is closed when a white yarn Y is detected.

[0118] Furthermore, as described above, when detecting white yarn Y and black (colored) yarn Y, it is necessary to change the presence or absence of the opening and closing of door 48 and the yarn detection method (i.e., determining the presence of yarn Y when light is detected, and determining the presence of yarn Y when no light is detected). In the winding machine unit 2 of Modified Example 3, a control unit as a mode switching unit is provided, which can selectively switch between a detection mode for white yarn (i.e., white yarn detection mode) and a detection mode for colored yarn (i.e., colored yarn detection mode). When the white yarn detection mode is selected, the control unit causes the white yarn light-emitting unit 552 to emit light and determines that yarn Y exists in the portion where light is received by the detection unit 53. When the colored yarn detection mode is selected, the control unit causes the colored yarn light-emitting unit 551 to emit light and determines that yarn Y exists in the portion where light is not received by the detection unit 53. In the winding machine unit 2 of Modified Example 3, for example, it is configured such that the above-mentioned detection mode can be set via the machine control device 3 (or a device similar to the machine control device 3). In the winding machine unit 2, by setting this mode, the state of the gate and the detection method suitable for detecting white yarn Y and the state of the gate and the detection method suitable for detecting black (colored) yarn Y can be switched.

[0119] Alternatively, instead of the configuration of Modified Example 3 with slit 47b and door 48, it can be configured to allow the end of cover 47 to extend and retract, so that the end of cover 47 retracts when detecting black (colored) yarn Y and extends when detecting white yarn Y. Furthermore, instead of door 48 or an extendable cover 47, the operator can install a screen or similar device depending on the type of yarn used (black or white).

[0120] (Variation Example 4) The winding machine unit 2 of Modified Example 4 is the same as the winding machine unit 2 of Modified Example 3, and is an example of a configuration suitable for situations where it is desired to change between white yarn Y and black (colored) yarn Y. The difference between the configuration of the winding machine unit 2 of Modified Example 4 and the configuration of the winding machine unit 2 of Modified Example 3 is that, as... Figure 12 As shown in (B), a white yarn detection line sensor 532 is provided for detecting light emitted by a light-emitting part 552 (55) for detecting white yarn, and a colored yarn detection line sensor 531 is provided for detecting light emitted by a light-emitting part 551 (55) for detecting colored yarn.

[0121] The colored yarn light-emitting part 551 illuminates light onto the outer peripheral surface 41d of the storage roller 41 via the slit 47b. The colored yarn detection line sensor 531 is positioned at the point where the light from the colored yarn light-emitting part 551, reflected from the outer peripheral surface 41d of the storage roller 41, is incident. The white yarn light-emitting part 552 illuminates light onto the outer peripheral surface 41d of the storage roller 41. The white yarn detection line sensor 532 is positioned such that the light from the white yarn light-emitting part 552 reflected from the outer peripheral surface 41d of the storage roller 41 is not incident, but the light from the white yarn light-emitting part 552 reflected from the yarn Y stored in the storage roller 41 is incident.

[0122] When using black (colored) yarn Y, and when determining whether yarn Y is stored in the storage roller 41, the control unit 25 opens the door 48. When using white yarn Y, or when not determining whether black (colored) yarn Y is stored in the storage roller 41, the control unit 25 closes the door 48. Thus, in one winding machine unit 2, it is possible to use both white yarn Y and black (colored) yarn Y.

[0123] A transparent window can also be provided in slit 47b, in which case the transmittance of the transparent window can be set to, for example, 0.4 to 0.6. In addition, a transparent window can also be used in variations 2 and 3.

[0124] (Variation Example 5) In Modifications 3 and 4, an example of a configuration suitable for situations where it is desired to replace white yarn Y with black (colored) yarn Y is described, with the yarn storage device 40 having a cover 47 provided. However, a configuration in which the yarn storage device 40 does not have a cover 47 can also be used. For example, as... Figure 13 (A) and Figure 13 As shown in (B), the detection unit 50, which includes a detection section 53 and a light-emitting section 55, can also be configured to move relative to the accumulation roller 41. The movement of the detection unit 50 described here includes at least one of horizontal movement and rotational movement. The detection unit 50 can be configured to be moved manually or by means of an actuator or the like.

[0125] In the winding machine unit 2 of Variation Example 4, when using black (colored) yarn Y, as follows: Figure 13 As shown in (A), the detection unit 50 is moved to a position where the light-emitting part 55 emits light towards the outer peripheral surface 41d of the accumulation roller 41, and the light from the light-emitting part 55, reflected by the outer peripheral surface 41d of the accumulation roller 41, is incident on the position of the thread sensor 53A. When using white yarn Y, as... Figure 13 As shown in (B), the detection unit 50 is moved to a position where the light-emitting part 55 irradiates light onto the outer peripheral surface 41d of the accumulation roller 41, and the light from the light-emitting part 55 reflected by the outer peripheral surface 41d of the accumulation roller 41 does not incident on the thread sensor 53A, and the light from the light-emitting part 55 reflected by the yarn Y stored in the accumulation roller 41 is incident on the thread sensor 53A. In the winding machine unit 2 of Modified Example 4, in a winding machine unit 2, it is possible to replace and use white yarn Y with black (colored) yarn Y.

[0126] (Other variations) In the above embodiments and variations, examples in which a first recess 43a and a second recess 43b are formed on the outer peripheral surface 41d of the accumulation roller 41 have been described, but it is also possible that the first recess 43a and the second recess 43b are not formed. Alternatively, only one of the first recess 43a and the second recess 43b may be formed on the outer peripheral surface 41d of the accumulation roller 41.

[0127] In the above embodiments and modifications, examples were given of determining the presence or absence of yarn Y, yarn breakage, or the presence or absence of yarn clumps based on the detection results of the thread sensor 53A when the accumulation roller 41 has rotated more than one revolution. However, in another modification, the presence or absence of yarn Y, yarn breakage, or the presence or absence of yarn clumps can also be determined based on the detection results of the thread sensor 53A during a portion of one revolution.

[0128] In addition, the detection method of yarn Y can be changed depending on whether the first recess 43a and the second recess 43b provided on the outer peripheral surface 41d of the accumulation roller 41 are mirror-finished (electroplated).

[0129] For example, in the case of mirror finishing (electroplation) with the first recess 43a and the second recess 43b, it is also possible to... Figure 13 The detection unit 50 shown in (A) is configured to detect black (colored) yarn Y. When detecting black (colored) yarn Y, it is preferable to use the detection result of the thread sensor 53A without the portions 43a and 43b, but it is not limited to this. Furthermore, it is also possible to... Figure 13 The detection unit 50 shown in (B) is configured to detect white yarn Y. When detecting white yarn Y, it is preferable to use the detection result of the line sensor 53A without the portions of the first recess 43a and the second recess 43b, but it is not limited to this.

[0130] For example, without mirror finishing (electroplation) of the first recess 43a and the second recess 43b, it is also possible to... Figure 13 The detection unit 50 shown in (A) is configured to detect white yarn Y. When detecting white yarn Y, the white yarn Y is detected by detecting the first recess 43a and the second recess 43b. Alternatively, it can also be... Figure 13 The detection unit 50 shown in (B) detects black (colored) yarn Y. Additionally, in Figure 13 In the configuration shown in (B), yarn Y of the white yarn system that does not have the first recess 43a and the second recess 43b can also be detected.

[0131] In the above embodiments and variations, examples of applying one aspect of the present invention to an automatic winding machine 1 have been described, but one aspect of the present invention can also be applied to an air-jet spinning machine, for example.

Claims

1. A yarn winding machine, comprising: The supply department is able to supply yarn; The take-up section takes up the yarn supplied from the supply section to form a package; A yarn storage device is provided in the middle of the yarn travel path formed between the supply section and the winding section. By rotating the storage roller, the yarn delivered from the supply section is wound around the storage area on the outer peripheral surface of the storage roller and temporarily stored. The control unit controls the rotation of the aforementioned accumulation roller; and The inspection unit inspects the yarn wound on the outer periphery of the aforementioned storage roller. The detection area of ​​the aforementioned detection unit is a straight section within the accumulation area that connects the end side of the accumulation area upstream in the direction of yarn travel and the end side of the accumulation area downstream in the direction of yarn travel, located at a position downstream of the end side of the upstream accumulation area. The aforementioned detection unit is a line sensor that detects whether the aforementioned yarn is present in the aforementioned straight line interval. The aforementioned yarn take-up machine also includes a light-emitting part that emits light toward the aforementioned storage roller. The aforementioned line sensor receives light reflected by the aforementioned accumulation roller or the aforementioned yarn. When the aforementioned line sensor receives light, the control unit determines that the light received by the line sensor is light reflected by either the accumulation roller or the yarn, and based on the determination result, determines whether the yarn is present in the straight line interval. The aforementioned line sensor is positioned such that light from the light-emitting part, reflected by the outer peripheral surface of the accumulation roller, does not incident on the light, but is incident on the light from the light-emitting part, reflected by the yarn stored in the accumulation roller. The aforementioned yarn take-up machine also includes a cover that faces a portion of the outer peripheral surface of the aforementioned accumulation roller. The aforementioned cover is disposed in at least a portion of the direction of travel of the light from the aforementioned light-emitting part, which is reflected by the outer peripheral surface of the aforementioned accumulation roller.

2. The yarn winding machine according to claim 1, wherein, Viewed from above, extending along the axis of rotation of the aforementioned accumulation roller, When one of the straight lines orthogonal to the aforementioned rotation axis is hypothetically designated as the first straight line, and one of the straight lines parallel to the first straight line and tangent to the outer peripheral surface of the aforementioned accumulation roller is hypothetically designated as the second straight line, The aforementioned line sensor is positioned between the aforementioned first straight line and the aforementioned second straight line. The light-emitting part is disposed on the first straight line, or disposed between the line sensor and the first straight line in the arrangement direction of the first straight line and the second straight line. The cover is positioned in the direction of the arrangement of the first straight line and the second straight line, and is located in the region opposite to the side where the first straight line is arranged, relative to the second straight line.

3. The yarn winding machine according to claim 1, wherein, The portion of the light incident from the light-emitting part within the aforementioned cover is black.

4. The yarn winding machine according to claim 2, wherein, The portion of the light incident from the light-emitting part within the aforementioned cover is black.

5. The yarn winding machine according to claim 1, wherein, The aforementioned light-emitting part includes a light-emitting part for white yarn and a light-emitting part for colored yarn. The aforementioned line sensor is positioned where light from the light-emitting part for white yarn reflected by the outer peripheral surface of the aforementioned accumulation roller is not incident, but light from the light-emitting part for white yarn reflected by the yarn stored in the aforementioned accumulation roller is incident, and is also positioned where light from the light-emitting part for colored yarn reflected by the outer peripheral surface of the aforementioned accumulation roller is incident.

6. The yarn winding machine according to claim 2, wherein, The aforementioned light-emitting part includes a light-emitting part for white yarn and a light-emitting part for colored yarn. The aforementioned line sensor is positioned where light from the light-emitting part for white yarn reflected by the outer peripheral surface of the aforementioned accumulation roller is not incident, but light from the light-emitting part for white yarn reflected by the yarn stored in the aforementioned accumulation roller is incident, and is also positioned where light from the light-emitting part for colored yarn reflected by the outer peripheral surface of the aforementioned accumulation roller is incident.

7. The yarn winding machine according to claim 3, wherein, The aforementioned light-emitting part includes a light-emitting part for white yarn and a light-emitting part for colored yarn. The aforementioned line sensor is positioned where light from the light-emitting part for white yarn reflected by the outer peripheral surface of the aforementioned accumulation roller is not incident, but light from the light-emitting part for white yarn reflected by the yarn stored in the aforementioned accumulation roller is incident, and is also positioned where light from the light-emitting part for colored yarn reflected by the outer peripheral surface of the aforementioned accumulation roller is incident.

8. The yarn winding machine according to claim 4, wherein, The aforementioned light-emitting part includes a light-emitting part for white yarn and a light-emitting part for colored yarn. The aforementioned line sensor is positioned where light from the light-emitting part for white yarn reflected by the outer peripheral surface of the aforementioned accumulation roller is not incident, but light from the light-emitting part for white yarn reflected by the yarn stored in the aforementioned accumulation roller is incident, and is also positioned where light from the light-emitting part for colored yarn reflected by the outer peripheral surface of the aforementioned accumulation roller is incident.

9. The yarn winding machine according to claim 5, wherein, The aforementioned yarn take-up machine also includes a mode switching unit, which can selectively switch between the detection mode for white yarn (i.e., white yarn detection mode) and the detection mode for colored yarn (i.e., colored yarn detection mode). When the white yarn detection mode is selected in the mode switching unit, the control unit causes the white yarn to emit light through the light-emitting unit and determines that the yarn is present in the portion where the light is received by the thread sensor. When the colored yarn detection mode is selected in the mode switching unit, the control unit causes the colored yarn to emit light through the light-emitting unit and determines that the yarn is present in the portion where the light is not received by the thread sensor.

10. The yarn winding machine according to claim 6, wherein, The aforementioned yarn take-up machine also includes a mode switching unit, which can selectively switch between the detection mode for white yarn (i.e., white yarn detection mode) and the detection mode for colored yarn (i.e., colored yarn detection mode). When the white yarn detection mode is selected in the mode switching unit, the control unit causes the white yarn to emit light through the light-emitting unit and determines that the yarn is present in the portion where the light is received by the thread sensor. When the colored yarn detection mode is selected in the mode switching unit, the control unit causes the colored yarn to emit light through the light-emitting unit and determines that the yarn is present in the portion where the light is not received by the thread sensor.

11. The yarn winding machine according to claim 7, wherein, The aforementioned yarn take-up machine also includes a mode switching unit, which can selectively switch between the detection mode for white yarn (i.e., white yarn detection mode) and the detection mode for colored yarn (i.e., colored yarn detection mode). When the white yarn detection mode is selected in the mode switching unit, the control unit causes the white yarn to emit light through the light-emitting unit and determines that the yarn is present in the portion where the light is received by the thread sensor. When the colored yarn detection mode is selected in the mode switching unit, the control unit causes the colored yarn to emit light through the light-emitting unit and determines that the yarn is present in the portion where the light is not received by the thread sensor.

12. The yarn winding machine according to claim 8, wherein, The aforementioned yarn take-up machine also includes a mode switching unit, which can selectively switch between the detection mode for white yarn (i.e., white yarn detection mode) and the detection mode for colored yarn (i.e., colored yarn detection mode). When the white yarn detection mode is selected in the mode switching unit, the control unit causes the white yarn to emit light through the light-emitting unit and determines that the yarn is present in the portion where the light is received by the thread sensor. When the colored yarn detection mode is selected in the mode switching unit, the control unit causes the colored yarn to emit light through the light-emitting unit and determines that the yarn is present in the portion where the light is not received by the thread sensor.

13. The yarn winding machine according to any one of claims 1 to 12, wherein, The control unit rotates the accumulation roller at least once, and determines whether the yarn is present in the accumulation area based on the detection result of the thread sensor when the accumulation roller rotates at least once.

14. The yarn winding machine according to claim 13, wherein, At least one recess extending along the rotation axis of the aforementioned accumulation roller is formed on the outer peripheral surface of the accumulation roller. The control unit determines that the accumulation roller has rotated one revolution by detecting that the recess, which serves as a reference, has rotated one revolution.

15. The yarn winding machine according to claim 14, wherein, Based on the detection results of the line sensor located at a different position from the recess, the control unit determines whether the yarn is present in the storage area.

16. The yarn winding machine according to claim 14, wherein, On the outer peripheral surface of the aforementioned accumulation roller, a plurality of recesses are formed along the rotation direction of the accumulation roller, and a plurality of adjacent recesses in the aforementioned rotation direction are formed, namely, connecting portions between the recesses. The control unit determines whether or not the yarn is present in the storage area based on the detection results of the thread sensors in at least a portion of the area of ​​each of the plurality of connecting parts.

17. The yarn winding machine according to claim 15, wherein, On the outer peripheral surface of the aforementioned accumulation roller, a plurality of recesses are formed along the rotation direction of the accumulation roller, and a plurality of adjacent recesses in the aforementioned rotation direction are formed, namely, connecting portions between the recesses. The control unit determines whether or not the yarn is present in the storage area based on the detection results of the thread sensors in at least a portion of the area of ​​each of the plurality of connecting parts.

18. The yarn winding machine according to claim 1, wherein, The control unit estimates information related to the yarn stored in the storage roller based on the amount of yarn supplied from the supply unit and the amount of yarn wound by the take-up unit, and determines whether the yarn is wound evenly in the storage area based on the information related to the yarn and the detection result of the yarn sensor.

19. The yarn winding machine according to claim 18, wherein, The aforementioned take-up section forms the package by rotating the take-up bobbin to wind the yarn fed from the yarn storage device onto the take-up bobbin. The control unit estimates information related to the yarn stored in the storage roller based on the average value of the difference between the rotational speed of the storage roller and the rotational speed of the take-up bobbin.

20. The yarn winding machine according to claim 1, wherein, When the quantity of yarn stored, which is information related to the yarn, is set as the estimated quantity, and the quantity of yarn stored calculated based on the detection results of the yarn sensor is set as the detected quantity, When the difference between the detected accumulation and the estimated accumulation is greater than the yarn breakage determination accumulation, the control unit determines that yarn breakage has occurred in the yarn accumulation device.

21. The yarn winding machine according to claim 1, wherein, Based on the detection results of the yarn sensor, the control unit determines that yarn breakage has occurred in the yarn storage device when the amount of movement per unit time at the downstream position of the yarn stored in the storage area is greater than the amount of movement for determining yarn breakage.

22. The yarn winding machine according to claim 1, wherein, When the quantity of yarn stored, which is information related to the yarn, is set as the estimated quantity, and the quantity of yarn stored calculated based on the detection results of the yarn sensor is set as the detected quantity, When the difference between the estimated accumulation and the detected accumulation is greater than the accumulation determined by the yarn block section, it is determined that a yarn block section has been generated in the yarn accumulation device.

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