JP2024060493A - Yarn Winding Machine - Google Patents

Abstract

[Problem] In a yarn winding machine using a storage roller, an overlapped winding portion occurs in the storage roller. [Solution] The yarn winding machine (2) has a supplying section (6) that supplies the yarn, a winding section (8) that winds the yarn supplied from the supplying section (6) to form a package, and a storage roller (41) that is disposed in the middle of the yarn traveling path along which the yarn travels between the supplying section (6) and the winding section (8), and is equipped with a yarn storage device (40) that rotates the storage roller (41) to wind the yarn sent out from the supplying section (6) around a storage area (A) on the outer circumferential surface of the storage roller (41) to temporarily store the yarn, a detection device (50) that detects the yarn wound around the outer circumferential surface of the storage roller (41), and a control section (25) that controls the rotation of the storage roller (41), acquires detection data from the detection device (50), and determines whether an overlapped winding portion (F) occurs in the storage area (A). [Selected Figure] Fig. 14

Description

This disclosure relates to a yarn winding machine.

A yarn winding machine winds the yarn unwound from a yarn supplying bobbin through a yarn travel path onto a winding section to form a package. Patent Document 1 discloses a yarn storage device that arranges a storage roller on the yarn travel path from the yarn supplying bobbin to the winding section of the yarn winding machine, and winds the yarn around the outer peripheral surface of the storage roller to temporarily store the yarn.

JP 2016-050053 A

The amount of yarn wound around the storage roller and the tension on the yarn are not always constant, but fluctuate due to various factors, such as replacement of yarn supply bobbins, unevenness of the yarn, and the state of package formation. When the amount of yarn wound around the storage roller and the tension on the yarn fluctuate, overlapping portions may occur in the yarn wound around the storage roller. When overlapping portions occur, unevenness occurs in the tension on the yarn, which may prevent the yarn from being unwound steadily from the storage roller, or stress may be applied to the yarn, causing problems such as uneven yarn thickness or yarn breakage.

The first objective of this disclosure is to automatically detect overlapping windings of yarn that occur on the storage roller. The second objective of this disclosure is to remove the overlapping windings that are detected.

The yarn winding machine according to the first aspect of the present disclosure includes:
A supply unit that supplies a yarn;
a winding section for winding the yarn supplied from the supply section to form a package;
a yarn storage device including a storage roller disposed midway along a yarn traveling path along which the yarn travels between the supply unit and the winding unit, and configured to temporarily store the yarn by rotating the storage roller to wind the yarn delivered from the supply unit around a storage area on an outer circumferential surface of the storage roller;
a detection device for detecting the yarn wound around the outer peripheral surface of the storage roller;
a control unit that controls rotation of the storage roller, acquires detection data from the detection device, and determines whether a lap winding portion is generated in the storage area;
It is equipped with:

The yarn winding machine of the first embodiment can automatically detect overlapping portions of the yarn, and can therefore take measures such as removing the overlapping portions of the yarn. This makes it possible to take measures before the tension on the yarn becomes abnormally large, improving the productivity of the yarn winding machine and suppressing the occurrence of defective portions of the yarn.

A yarn winding machine according to a second aspect of the present disclosure is the yarn winding machine according to the first aspect,
In the yarn traveling path, when the supply section side is an upstream side and the winding section side is a downstream side,
The detection device detects an upstream end position of the yarn wound around the storage area,
The control unit determines whether or not a lap winding portion has occurred based on the storage upstream end position.

The yarn winding machine of the second aspect can easily detect the occurrence of overlapping windings, making it possible to easily take measures before the tension on the yarn becomes abnormally large, thereby improving the productivity of the yarn winding machine and suppressing the occurrence of defective parts in the yarn.

A yarn winding machine according to a third aspect of the present disclosure is the yarn winding machine according to the first aspect,
In the yarn traveling path, when the supply section side is an upstream side and the winding section side is a downstream side,
The detection device detects an upstream end position of the yarn wound around the storage area,
The control unit determines whether or not a lap winding portion has occurred based on whether the upstream end position of the storage reservoir has lowered and the amount by which the upstream end position of the storage reservoir has lowered from a reference position.

The yarn winding machine of the third aspect can detect the occurrence of overlapped windings in a simple manner.

A yarn winding machine according to a fourth aspect of the present disclosure is the yarn winding machine according to the third aspect,
Further, a yarn joining device is provided between the supply section and the storage roller of the yarn traveling path,
The reference position is the upstream end position of the yarn detected by the detection device during a period when the yarn winding machine is stably winding the yarn and before the yarn joining device joins the yarn, before the control unit determines that an overlapping winding portion has occurred.

The yarn winding machine of the fourth aspect has the reference position for the upstream storage end position of the yarn set to the period when the yarn winding machine is stably winding the yarn, prior to yarn joining by the yarn joining device, thereby reducing the frequency of erroneous detection of the overlap winding portion.

A yarn winding machine according to a fifth aspect of the present disclosure is the yarn winding machine according to any one of the first to fourth aspects,
When the control unit determines that a lap winding portion has occurred in the storage area,
The rotation speed of the storage roller is changed from that during normal winding operation, and a lap winding portion removal operation is performed to remove the lap winding portion.

The yarn winding machine of the fifth aspect performs overlap winding portion removal operation, so it can remove overlap winding portions. This makes it possible to take measures before the tension on the yarn becomes abnormally large, improving the productivity of the yarn winding machine and suppressing the occurrence of defective parts in the yarn.

A yarn winding machine of a sixth aspect of the present disclosure is the yarn winding machine of the fifth aspect,
Further, a suction mechanism is provided that sucks the yarn wound around the storage area from the upstream end position of the storage area,
When the control unit determines that an overlapped winding portion has occurred in the storage area, it performs a first overlapped winding portion removal operation in which the storage roller is reversed for a predetermined period of time and the yarn wound in the storage area is sucked up and removed from the storage upstream end position.

The sixth aspect of the yarn winding machine removes the yarn wound in the storage area by suction from the upstream storage end position, so there is a relatively high probability of removing the overlapped winding portion. This makes it possible to take measures before the tension on the yarn becomes abnormally large, improving the productivity of the yarn winding machine and suppressing the occurrence of defective parts in the yarn.

A yarn winding machine of a seventh aspect of the present disclosure is the yarn winding machine of the sixth aspect,
After the first overlapped winding portion removal operation, the control unit performs a normal yarn winding operation, and when it determines that an overlapped winding portion has occurred in the storage area again, it further performs a second overlapped winding portion removal operation in which the storage roller is reversed for a predetermined time and the yarn wound in the storage area is sucked up and removed from the storage upstream end position.

The yarn winding machine of the seventh aspect performs a second overlap winding section removal operation if a further overlap winding section occurs after the first overlap winding section removal operation, so that the overlap winding section can be removed with a higher probability.

A yarn winding machine according to an eighth aspect of the present disclosure is the yarn winding machine according to any one of the first to seventh aspects,
The yarn supplying device further includes a tension applying unit that applies a predetermined tension to the yarn between the supply unit and the yarn pooling device,
The supply unit is configured to supply the yarn by replacing a yarn supplying bobbin for supplying the yarn,
When a normal winding operation is started immediately after replacing the yarn supplying bobbin, the control unit controls the tension applying unit so that the tension on the yarn entry side into the storage area is higher than that during normal operation.

The yarn winding machine of the eighth aspect prevents a sudden change in tension before and after replacing the yarn supply bobbin, and suppresses the occurrence of overlapped windings.

A yarn winding machine of a ninth aspect of the present disclosure is the yarn winding machine of the eighth aspect,
Further comprising a tension sensor for detecting the tension of the yarn,
The control unit measures the tension using the tension sensor at the yarn entry side into the storage area before and after replacing the yarn supplying bobbin, and controls the tension applying unit so that the tension immediately after replacing the yarn supplying bobbin is approximately the same as the tension immediately before replacing the yarn supplying bobbin.

The ninth aspect of the yarn winding machine prevents sudden changes in tension before and after replacing the yarn supply bobbin, and suppresses the occurrence of overlapped windings.

A yarn winding machine of a tenth aspect of the present disclosure is the yarn winding machine of any one of the first to eighth aspects,
The detection device includes a line sensor that detects the yarn in the storage area in a direction parallel to the rotation axis of the storage roller.

The yarn winding machine of the tenth aspect can detect the occurrence of overlapping windings in a simple manner using a line sensor.

A yarn winding machine of an eleventh aspect of the present disclosure is the yarn winding machine of any one of the first to ninth aspects,
The detection device includes a camera that images the yarn in the storage area.

The yarn winding machine of the eleventh embodiment can detect the occurrence of overlapping winding portions in a simple manner using a camera.

A yarn winding machine of a twelfth aspect of the present disclosure is the yarn winding machine of any one of the first to ninth aspects,
The detection device includes a plurality of light emitting and receiving sensors that detect the yarn in the storage area.

The yarn winding machine of the twelfth embodiment can detect the occurrence of overlapping windings in a simple manner using a light emitting/receiving sensor.

A yarn winding machine of a thirteenth aspect of the present disclosure is the yarn winding machine of any one of the first to eleventh aspects,
The yarn pooling device is configured such that, in the pooling area, the downstream yarn is pushed by the upstream yarn and advances downstream.

The yarn winding machine of the thirteenth aspect is configured such that in the storage area, the downstream yarn is pushed by the upstream yarn and moves downstream, so there is a high possibility that an overlapping winding section will occur, causing problems with yarn feeding.

The yarn winding machine of the fourteenth aspect of the present disclosure is any one of the yarn winding machines of the first to sixth aspects, and further includes an air spinning device.

The yarn winding machine of the fifteenth aspect of the present disclosure is any one of the yarn winding machines of the first to sixth aspects, and the yarn winding machine is an open-end spinning machine.

The yarn winding machine of the present disclosure can automatically detect overlapping portions of the yarn, allowing measures such as removing the overlapping portions of the yarn to be taken. This makes it possible to take measures before the tension on the yarn becomes abnormally large, improving the productivity of the yarn winding machine and reducing the occurrence of defective portions of the yarn.

FIG. 1 is a schematic front view showing the overall configuration of an automatic winder 1 according to a first embodiment. FIG. 2 is a schematic side view showing the configuration of the winder unit (yarn winding machine) 2 according to the first embodiment. FIG. 3 is a perspective view of the yarn pooling device 40 according to the first embodiment. Fig. 4(A) is a diagram showing the positional relationship between the yarn pooling device 40 and the detection unit 53. Fig. 4(B) is a diagram showing the positional relationship between the yarn pooling device 40 and the light emitting unit 55. Fig. 4(C) is a diagram showing the positional relationship between the yarn pooling device 40 and the detection device 50. Fig. 5(A) is a planar development of the outer peripheral surface of the storage roller 41 so that parts of the surface overlap in the direction of rotation. Fig. 5(B) is a planar development of the outer peripheral surface of the storage roller 41 so that parts of the surface overlap in the direction of rotation when a yarn is present on the outer peripheral surface of the storage roller 41. Fig. 5(C) is a planar development of the outer peripheral surface of the storage roller 41 so that parts of the surface overlap in the direction of rotation when a yarn and a recess are present on the outer peripheral surface of the storage roller 41. FIG. 6 is a diagram showing an example of the result obtained by the line sensor 53A. Fig. 7(A) is a diagram showing the positional relationship between the storage roller 41 and the detection device 50 of the winder unit 2 according to Modification A1. Fig. 7(B) is a diagram showing the positional relationship between the yarn storage roller 41 and the detection device 50 of the winder unit 2 according to Modification A2. FIG. 8 is a diagram showing an example of the result obtained by the line sensor 53A according to the modified example. Fig. 9(A) is a diagram showing the positional relationship between the yarn pooling roller 41 and the detection device 50 of the winder unit 2 according to Modification A3. Fig. 9(B) is a diagram showing the positional relationship between the yarn pooling roller 41 and the detection device 50 of the winder unit 2 according to Modification A4. Fig. 10(A) is a diagram showing the positional relationship between the yarn pooling roller 41 and the detection device 50 of the winder unit 2 according to the modified example A5. Fig. 10(B) is a diagram showing the positional relationship between the yarn pooling roller 41 and the detection device 50 of another winder unit 2 according to the modified example A5. FIG. 11 is a side view that shows a schematic view of the yarn Y being normally wound and stored on the storage roller 41. As shown in FIG. FIG. 12 is a side view that shows a schematic diagram of a state in which a lap winding portion F is generated in the storage area A of the storage roller 41. As shown in FIG. FIG. 13 is a side view that shows a schematic view of the state of the storage roller 41 after the overlapped winding portion F is generated in the storage area A of the storage roller 41 and the overlapped winding portion F is removed from the upstream side. FIG. 14 shows an example of measurement of the change over time in the position of the upstream storage end E1 in the storage area A of the storage roller 41 during winding operation of the winder unit 2. In FIG. FIG. 15 shows another example of measurements of the change over time in the position of the upstream storage end E1 in the storage area A of the storage roller 41 during winding operation of the winder unit 2. In FIG. FIG. 16 shows another example of measurements of the change over time in the position of the upstream storage end E1 in the storage area A of the storage roller 41 during winding operation of the winder unit 2. In FIG. FIG. 17 shows another example of measurements of the change over time in the position of the upstream storage end E1 in the storage area A of the storage roller 41 during winding operation of the winder unit 2. In FIG. FIG. 18 shows another example of measurements of the change over time in the position of the upstream storage end E1 in the storage area A of the storage roller 41 during winding operation of the winder unit 2. In FIG. FIG. 19 shows another example of measurements of the change over time in the position of the upstream storage end E1 in the storage area A of the storage roller 41 during winding operation of the winder unit 2. In FIG. FIG. 20 is a diagram showing the target tension value, the measured tension value, and the roller speed when the yarn supplying bobbin is changed in the winder unit 2. In FIG. FIG. 21 is a flowchart showing the yarn winding operation method according to the first embodiment. Fig. 22(A) is a diagram showing the positional relationship between the yarn pooling device 40 and the detection unit 53 in Modification B1. Fig. 22(B) is a diagram showing the positional relationship between the yarn pooling device 40 and the light-emitting unit 55 in Modification B1. Fig. 22(C) is a diagram showing the positional relationship between the yarn pooling device 40 and the detection device 50 in Modification B1. FIG. 23 is a diagram showing the configuration of a detection device 50 according to modification B2.

1. First embodiment (1) Configuration of automatic winder 1 As shown in FIG. 1 , the automatic winder 1 of this embodiment includes a plurality of winder units (yarn winding machines) 2 arranged side by side, a machine control device 3, a yarn supplying bobbin supplying device 4, a doffing device 5, and a blower box (not shown).

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

The yarn supplying bobbin supplying device 4 sets the yarn supplying bobbins 21 one by one on the transport tray 26. The yarn supplying bobbin supplying device 4 supplies the yarn supplying bobbins 21 set on the transport tray 26 to each of the multiple winder units 2.

When the package 30 in the winder unit 2 becomes full (a specified amount of yarn Y is wound), the doffing device 5 travels to the position of the winder unit 2 and removes the full package 30. The doffing device 5 sets a winding bobbin 22 on which yarn Y is not wound to the winder unit 2 from which the package 30 has been removed.

(2) Configuration of the Winder Unit (Yarn Winding Machine) 2 Next, the configuration of the winder unit 2 will be described. As shown in Fig. 2, the winder unit 2 includes a yarn supplying section (supply section) 6, a yarn pooling device 40, a detection device 50, a cover 47, a package forming section (winding section) 8, a wax application device 70, and a control section 25. In the winder unit 2, the yarn Y from the yarn supplying bobbin 21 of the yarn supplying section 6 is unwound and temporarily stored in the yarn pooling device 40. After that, the package forming section 8 pulls out the yarn Y stored in the yarn pooling device 40 and winds it around the winding bobbin 22 to form a package 30.

The yarn supplying section 6 is configured to support the yarn supplying bobbin 21 set on the transport tray 26 at a predetermined position and to be able to unwind the yarn Y from the yarn supplying bobbin 21. When all the yarn Y has been unwound from the yarn supplying bobbin 21, the yarn supplying section 6 ejects the core tube of the yarn supplying bobbin 21 on which the yarn Y is not wound, and receives a new yarn supplying bobbin 21 from the yarn supplying bobbin supply device 4.

The yarn storage device 40 is disposed in the middle of the yarn travel path formed between the yarn supplying section 6 and the package forming section 8. The yarn storage device 40 is provided in a position upstream of the wax application device 70 in the travel direction of the yarn Y. The yarn storage device 40 winds and temporarily stores the yarn Y unwound in the yarn supplying section 6. The yarn storage device 40 supplies the stored yarn Y to the package forming section 8.

The yarn storage device 40 includes a storage roller 41 on which the yarn Y can be wound, a drive motor 45 that rotates and drives the storage roller 41, and a cover 47. The storage roller 41 temporarily stores the yarn Y by winding the yarn Y around the storage area A of the outer circumferential surface 41d of the storage roller 41. The storage roller 41 is supported on the machine base (frame) of the automatic winder 1 so as to be rotatable about a rotation axis C1 that is slightly inclined with respect to the horizontal direction. As shown in Figures 2 and 3, tapered portions 41a and 41b whose diameters increase toward the ends are formed on both ends of the storage roller 41 in the axial direction. The portion between the two tapered portions 41a and 41b is a cylindrical portion 41c with a constant diameter, and its outer circumferential surface 41d is the storage area A on which the yarn Y is wound. The outer circumferential surface 41d of the cylindrical portion 41c is mirror-finished. The two tapered sections 41a and 41b on both ends prevent the thread Y wound around the cylindrical section 41c from falling off.

A ring member 42 is wound around the outer circumferential surface 41d of the cylindrical portion 41c of the storage roller 41. The ring member 42 is formed in a circular ring shape, for example, from rubber. The ring member 42 is attached to the boundary between the cylindrical portion 41c and the tapered portion 41b at the tip side. The ring member 42 is a tension ring that surrounds the yarn Y drawn out from the storage roller 41 by the package forming unit 8 and contacts the yarn Y to provide resistance. The ring member 42 is attached to the cylindrical portion 41c by an elastic force that tightens it radially inward. The ring member 42 provides resistance to the yarn Y drawn out from the storage roller 41 by the elastic force. The ring member 42 provides an appropriate tension to the yarn Y drawn out from the storage roller 41, stabilizing the unwinding of the yarn Y from the storage roller 41.

In the outer peripheral surface 41d of the storage roller 41, a first recess (recess) 43a is provided in a region that spans the mounting position of the ring member 42 in a direction along the rotation axis C1. In other words, when viewed from the radial outside of the storage roller 41, the first recess 43a is provided so as to pass through the mounting position of the ring member 42 and intersects with the mounting position, and a part of the first recess 43a overlaps with the mounting position. Here, the first recess 43a forms a groove portion that extends in a direction along the rotation axis C1 from one end to the other end of the storage roller 41. The first recess 43a has, for example, the same cross-sectional shape in its longitudinal direction and is formed in a substantially rectangular cross-section. The outer peripheral surface 41d of the storage roller 41 is further provided with a second recess (recess) 43b. The second recess (recess) 43b is a recess (so-called downgage) that is provided so that a recess (so-called sink mark) is not formed when molding a boss or reinforcing rib for embedding a sensor magnet on the inner circumferential surface 41g of the cylindrical portion 41c.

The drive motor 45 rotates the storage roller 41 in a direction to wind the yarn Y from the yarn supplying section 6. The drive motor 45 can also rotate the storage roller 41 in a direction opposite to the winding direction. The drive motor 45 is a position-controllable motor such as a DC brushless motor, a stepping motor, or a servo motor.

A downstream yarn blowing and sending section 80 is disposed near the tapered section 41a at one end of the storage roller 41 (the upstream side of the storage roller 41). The downstream yarn blowing and sending section 80 is disposed close to the outer circumferential surface 41d of the storage roller 41. During normal yarn winding, the yarn on the yarn supplying section 6 side passes through the downstream yarn blowing and sending section 80 and is guided to the tapered section 41a at one end of the storage roller 41. When the drive motor 45 is driven to rotate the storage roller 41 in one direction, the yarn Y guided to the tapered section 41a at one end of the storage roller 41 by the downstream yarn blowing and sending section 80 is wound sequentially while pushing up the previous yarn layer from one end side (upstream side) of the cylindrical section 41c. As a result, the yarn Y already wound on the outer circumferential surface 41d of the storage roller 41 is pushed by the newly wound yarn Y and is sent sequentially to the other end side (downstream side). As a result, the yarn Y is aligned in a spiral shape and regularly winds around the outer circumferential surface of the cylindrical portion 41c of the storage roller 41 from one end to the other end.

From the tapered portion 41b on the other end side of the storage roller 41 (the upstream side of the storage roller 41), the yarn Y wound around the storage roller 41 is pulled out and sent downstream (towards the package forming section 8). At the tapered portion 41b, the yarn Y on the storage roller 41 is pulled out downstream via a pull-out guide 37 located on an extension of the rotation axis C1 of the storage roller 41. The yarn Y wound around the storage roller 41 is unwound through the gap with the ring member 42, which provides an appropriate tension to the unwound yarn Y.

As shown in Figs. 1 and 2, the package forming unit 8 includes a cradle 23 configured to be able to mount the winding bobbin 22, and a traverse drum 24 that drives the winding bobbin 22 while traversing the yarn Y. The package forming unit 8 constitutes a winding unit. The cradle 23 rotatably supports the winding bobbin 22 (or the package 30). The cradle 23 is configured to be able to bring the outer peripheral surface of the supported package 30 into contact with the outer peripheral surface of the traverse drum 24.

The traverse drum 24 is driven to rotate by a drive source (such as an electric motor) (not shown), and rotates while in contact with the outer peripheral surface of the winding bobbin 22 or the package 30, thereby rotating the winding bobbin 22. This allows the yarn Y stored in the yarn storage device 40 to be unwound, pulled out, and wound onto the winding bobbin 22. A traverse groove (not shown) is formed on the outer peripheral surface of the traverse drum 24, which allows the yarn Y to traverse at a predetermined width. With the above configuration, the yarn Y can be wound around the winding bobbin 22 while traversing it, forming a package 30 of a predetermined shape.

The wax application device 70 is disposed between the yarn storage device 40 and the package forming section 8. The wax application device 70 applies wax to the yarn Y traveling from the yarn storage device 40 toward the package forming section 8.

The winder unit 2 is equipped with various devices in the yarn travel path from the yarn supplying section 6 to the package forming section 8 via the yarn storage device 40. Specifically, in the yarn path (yarn travel path) of the yarn Y, an unwinding assist device 10, a lower yarn feeler 11, a tension applying section 12, a capture device 13, a yarn joining device 14, a yarn monitoring device 16, and a downstream yarn blowing and sending section 80 are arranged in this order from the upstream yarn supplying section 6 side to the downstream yarn storage device 40 side.

The unwinding assist device 10 assists in the unwinding of the yarn Y by bringing a movable member 27 into contact with a balloon formed above the yarn supplying bobbin 21 as the yarn Y unwound from the yarn supplying bobbin 21 swings around and appropriately controlling the size of the balloon.

The lower thread feeler 11 is disposed downstream of the unwinding assist device 10 and in close proximity to the unwinding assist device 10. The lower thread feeler 11 determines whether or not the thread Y supplied from the unwinding assist device 10 is present.

The tension applying unit 12 applies a predetermined tension to the running yarn Y. The tension applying unit 12 applies a predetermined tension to the yarn Y based on the tension of the yarn Y detected by the tension sensor 12S. The tension applying unit 12 is configured as a gate type in which movable comb teeth are arranged relative to fixed comb teeth, and applies a predetermined resistance by running the yarn Y between the comb teeth. The movable comb teeth are configured to be movable, for example, by a solenoid, so that the comb teeth are in an interlocking state or a released state. This allows the tension applying unit 12 to adjust the tension applied to the yarn Y. The configuration of the tension applying unit 12 is not particularly limited, and may be, for example, a disk-type tension applying unit.

The capture device 13 is disposed downstream of the tension applying section 12. The capture device 13 has a first capture section 13A and a second capture section 13B. In this embodiment, the first capture section 13A and the second capture section 13B are integrated and configured as a single component. Each of the first capture section 13A and the second capture section 13B is connected to a negative pressure source (not shown).

The first capture section 13A is configured as a cylindrical member with an opening at its tip. The first capture section 13A generates a suction air flow during yarn splicing to suck in and capture the yarn Y on the yarn storage device 40 side.

The second capturing section 13B is configured as a cylindrical member with an opening formed at the tip. The second capturing section 13B is provided so as to be able to swing. The second capturing section 13B swings between a capturing position (first position) (position shown by a solid line in FIG. 2) where it captures the yarn Y supplied from the unwinding assist device 10, and a guide position (second position) (position shown by a dashed line in FIG. 2) where it guides the yarn Y to the yarn joining device 14. The capturing position may also be a standby position of the second capturing section 13B.

When the second capture unit 13B is in the capture position and approaching the yarn path downstream of the lower yarn feeler 11, it generates a suction air flow at its tip to suck in and capture the yarn end from the yarn supplying bobbin 21. When the yarn Y is cut by the cutter 15, the second capture unit 13B sucks in and captures the yarn end of the cut yarn Y on the yarn supplying bobbin 21 side. The second capture unit 13B may also be configured to suck in and remove lint and other debris adhering to the traveling yarn Y by generating a suction air flow at its tip.

When the yarn Y is captured by the second capturing section 13B, immediately after a new yarn supplying bobbin 21 is supplied to the yarn supplying section 6, an auxiliary blowing section 28 is provided to blow the yarn end to a position downstream of the lower yarn feeler 11 (the tip of the second capturing section 13B).

The auxiliary blowing section 28 blows compressed air into the hollow-shaped transport tray 26 and the yarn supplying bobbin 21, creating an air flow at the tip of the yarn supplying bobbin 21 that blows the yarn Y of the yarn supplying bobbin 21 toward the lower thread feeler 11. When a newly supplied yarn supplying bobbin 21 is supported by the yarn supplying section 6, the auxiliary blowing section 28 operates to reliably send the yarn end of the yarn supplying bobbin 21 toward the lower thread feeler 11.

The yarn joining device 14 joins the divided yarn Y. The yarn joining device 14 joins the yarn Y on the yarn supplying bobbin 21 side to the yarn storage device 40 side when the yarn Y is cut by the cutter 15 after the yarn monitoring device 16 detects a yarn defect, when the yarn Y is broken while being unwound from the yarn supplying bobbin 21, or when the yarn Y between the yarn supplying bobbin 21 and the yarn storage device 40 is broken, such as when the yarn supplying bobbin 21 is replaced. The yarn joining device 14 is disposed at a position slightly removed from the yarn path. The yarn joining device 14 can join the introduced yarn ends to make the yarn Y continuous. The yarn joining device 14 can be a device that uses a fluid such as compressed air or a mechanical device.

The yarn monitoring device 16 detects yarn defects such as slub and foreign matter contamination by monitoring the thickness of the yarn Y with an appropriate sensor. A cutter 15 is disposed in a position adjacent to the yarn monitoring device 16 on the upstream side of the yarn monitoring device 16. The cutter 15 immediately cuts the yarn Y when the yarn monitoring device 16 detects a yarn defect. The cutter 15 and the yarn monitoring device 16 are housed in a common housing 19. The housing 19 that houses the yarn monitoring device 16 is disposed downstream of the yarn joining device 14.

The downstream yarn blowing and sending section 80 is an air sucker device arranged in a position adjacent to the yarn storage device 40 on the upstream side of the yarn storage device 40. The downstream yarn blowing and sending section 80 forms an air flow by blowing out compressed air, which sucks in the yarn end on the yarn storage device 40 side present on the storage area A of the storage roller 41, and then blows it off and sends it to the first capture section 13A. Specifically, the downstream yarn blowing and sending section 80 includes a thin cylindrical guide member (not shown) through which the yarn Y can pass, and a curved cylindrical member, the yarn guide member 60. An outlet for the yarn Y is formed at one end of the guide member. The yarn guide member 60 is provided so as to be adjacent to the outlet of the downstream yarn blowing and sending section 80. An opening is formed at each of the longitudinal ends of the yarn guide member 60.

The yarn guide member 60 is arranged with an opening at one end facing the outlet of the downstream yarn blowing and sending section 80, and an opening at the other end facing the first capturing section 13A. A guide path is formed inside the yarn guide member 60. The guide path connects the openings at both ends of the yarn guide member 60 so as to bypass the yarn monitoring device 16, the yarn joining device 14, etc. The downstream yarn blowing and sending section 80, the yarn guide member 60, and the first capturing section 13A constitute the storage side yarn end capturing device 75.

When the yarn Y is broken between the yarn supplying bobbin 21 and the yarn storage device 40, the downstream yarn blowing and sending section 80 captures the yarn Y on the yarn storage device 40 side and blows it into the guide path of the yarn guiding member 60, and pulls the yarn Y along the guide path and captures it in the first capture section 13A. Since the yarn guiding member 60 has a through-slit (not shown) formed over its entire length, the yarn Y can be pulled out from inside the yarn guiding member 60 while it is captured in the first capture section 13A. As a result, the downstream yarn blowing and sending section 80 blows the yarn Y on the yarn storage device 40 side and guides it toward the yarn joining device 14 side.

Each winder unit 2 is equipped with a control unit 25. The control unit 25 is equipped with hardware such as a CPU, ROM, and RAM (not shown). Software such as a control program is stored in the RAM. The control unit 25 controls each component of the winder unit 2 through cooperation between the hardware and software. The control unit 25 is configured to be able to communicate with the machine control device 3. This allows the operation of the multiple winder units 2 equipped in the automatic winder 1 to be centrally managed by the machine control device 3.

(3) Configuration of the detection device 50 and a method for detecting the yarn Y wound around the outer circumferential surface 41d of the storage roller 41 As shown in Figures 4A to 4C, the detection device 50 includes a detection unit 53 and a light-emitting unit 55. The detection unit 53 and the light-emitting unit 55 are housed in a housing 51, and are fixed to the machine base of the automatic winder 1. The detection unit 53 detects the yarn Y wound around the outer circumferential surface 41d of the storage roller 41.

The detection unit 53 is disposed near the outer circumferential surface 41d of the cylindrical portion 41c of the storage roller 41. For example, the detection unit 53 can detect when the yarn Y of the storage roller 41 is equal to or greater than a predetermined upper limit amount, and when it is less than a predetermined lower limit amount. The detection unit 53 may detect from the upper limit amount to the lower limit amount as a detection range. The detection range may be a wider range including a portion exceeding the upper limit amount and a portion below the lower limit amount. This makes it possible to detect, for example, an excess amount relative to the upper limit value. In this embodiment, it is detected from within the detection range that the yarn Y of the storage roller 41 is equal to or greater than a predetermined upper limit amount, and when it is less than a predetermined lower limit amount. The above terms "above" and "below" can be appropriately expressed as "exceed" and "below". The detection result by the detection unit 53 is acquired 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 storage amount (wrap amount) of the storage roller 41 falls between the upper limit amount and the lower limit amount.

The detection unit 53 has a line sensor 53A that detects the presence or absence of yarn Y in a straight section S1 that connects between an upstream end 41f in the running direction of the yarn Y and a downstream end 41e in the running direction of the yarn Y in the storage area A formed on the outer circumferential surface 41d of the cylindrical portion 41c, and a lens 53B that reduces the incident light. An example of the line sensor 53A is a CCD image sensor or a CMOS image sensor that acquires the amount of light using photodiodes arranged in a row. The line sensor 53A receives light through a lens 53B that reduces the incident light. In this embodiment, the line sensor 53A is provided so that the extension direction of the straight section S1 is parallel to the extension direction of the rotation axis C1, but the line sensor 53A may be provided so that the extension direction of the straight section S1 intersects with the extension direction of the rotation axis C1.

The light-emitting unit 55 has two light sources 55B, 55B, and an optical waveguide 55C that converts the light emitted from the two light sources 55B, 55B into surface emission and emits it toward the storage roller 41. Some of the components of the optical waveguide 55C include a diffusion plate such as an acrylic plate that guides the light. An example of the two light sources 55B, 55B is an LED (Light Emitting Diode), which is provided on the LED board 55A. Note that the number of light sources is not limited to two.

The line sensor 53A is disposed at a position where light from the light-emitting unit 55 that reflects the outer peripheral surface 41d of the storage roller 41 is not incident, and where light from the light-emitting unit 55 that reflects the yarn Y stored in the storage roller 41 is incident. For example, as shown in FIG. 4(C), the line sensor 53A emits light at an irradiation angle θ in the range of 0° to 30°. "The line sensor 53A is disposed so that light from the light-emitting unit 55 that reflects the outer peripheral surface 41d of the storage roller 41 is not incident" means that the light emitted from the light-emitting unit 55 at such an angle is totally reflected by the outer peripheral surface 41d of the storage roller 41, and the line sensor 53A is disposed at a position where the reflected light is not incident.

Here, one of the straight lines perpendicular to the rotation axis C1 is virtually set 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 storage roller 41 is virtually set as the second straight line L2. In this embodiment, in a plan view seen from the direction in which the rotation axis C1 of the storage roller 41 extends, the light emitting unit 55 is disposed on the first straight line L1, or 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. This allows the light emitting unit 55 to emit light to a part of the storage 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 an area on the opposite side of the second straight line L2 from the side on which the first straight line L1 is disposed in the direction in which the first straight line L1 and the second straight line are aligned.

The cover 47 is provided so as to face a part of the outer peripheral surface 41d of the storage roller 41. The cover 47 is provided at least part of the traveling direction of the light from the light emitting unit 55 reflected by the outer peripheral surface 41d of the storage roller 41. The cover 47 may also be provided at least part of the traveling direction of the light from the light emitting unit 55 that does not reflect the outer peripheral surface 41d of the storage roller 41. At least a part of the facing surface 47a, which is the part of the cover 47 where the light from the light emitting unit 55 is incident, is formed to have a color that reduces the reflectance of light (for example, black). By reducing the reflectance in this way, it is possible to prevent the reflected light from the cover 47 from being incident on the storage roller 41. This makes it possible to prevent the light reflected from the yarn Y from being detected by the line sensor 53A, which makes it impossible to properly detect the light.

In addition, even if the cover 47 is not provided, the periphery of the yarn storage device 40 may be configured so that no structural parts that reflect light in the traveling direction of the light from the light-emitting unit 55 are arranged. Even if a structural part that reflects light in the traveling direction of the light from the light-emitting unit 55 is arranged, if the structure is arranged in a position where the reflected light is sufficiently attenuated by the time it reaches the line sensor 53A, it is possible to prevent the light reflected from the yarn Y from being unable to be properly detected.

In this embodiment, the control unit 25 determines whether or not there is yarn Y on the outer peripheral surface 41d (storage area A) of the storage roller 41. The control unit 25 determines whether or not there is yarn Y on the outer peripheral surface 41d based on the detection results by the line sensor 53A. FIG. 5(A) is a planar view of the outer peripheral surface 41d of the storage roller 41, with parts of the outer peripheral surface 41d overlapping in the direction of rotation. The line sensor 53A detects whether or not there is yarn Y in the range R shown in FIG. 5(A). More specifically, the control unit 25 rotates the storage roller 41 once at a low speed (less than 200 rpm) and determines whether or not there is yarn Y on the outer peripheral surface 41d based on the detection results by the line sensor 53A when the storage roller 41 is rotated once.

In addition, the storage roller 41 may be rotated once at high speed (200 rpm or more), and the presence or absence of the yarn Y on the outer surface 41d may be determined based on the detection result by the line sensor 53A when the storage roller 41 is rotated once. In the line sensor 53A of this embodiment, the influence of the reflected light by the first recess 43a and the second recess 43b is small in the storage roller 41 rotating at high speed. Therefore, the amount of stored yarn can be detected by ignoring the reflected light by the first recess 43a and the second recess 43b. In this case, as shown in FIG. 5(C), the reflected light is large in the portion YC where the yarn Y is dense, so it is easily detected by the line sensor 53A. On the other hand, the reflected light is small in the single yarn portion Y1 pulled out from the portion YC where the yarn Y is dense, so it is difficult to detect by the line sensor 53A.

For example, as shown in FIG. 4(C), when yarn Y is present on the outer peripheral surface 41d of the storage roller 41, the control unit 25 determines that even if the light emitted from the light emitting unit 55 is reflected by the outer peripheral surface 41d as described above, it is not reflected toward the line sensor 53A, but is reflected toward the cover 47. Instead, when yarn Y is present on the outer peripheral surface 41d, the light reflected by yarn Y is reflected toward the line sensor 53A, and the light is detected by the line sensor 53A.

The detection result by the line sensor 53A at this time is acquired by the control unit 25 as data such as that shown in FIG. 6. In the data shown in FIG. 6, the area where a relatively large amount of light is detected, i.e., the area where a whitish image is acquired when converted to a BMP image, indicates the area where the thread (white thread) Y is detected, and the area where a relatively small amount of light is detected, i.e., the area where a blackish image is acquired when converted to a BMP image, indicates the area where the thread (white thread) Y is not detected. The pixel position (pixel) in the detection result of the line sensor 53A indicates the position in the straight section S1. That is, the control unit 25 can determine where the thread Y is and is not present in the straight section S1 based on the detection result by the line sensor 53A. In this way, the control unit 25 can accurately detect the presence or absence of the thread Y in the range R shown in FIG. 5(B) based on the amount of light detected by the line sensor 53A.

As described above, the first recess 43a and the second recess 43b are formed on the outer peripheral surface 41d of the storage roller 41 in this embodiment. The control unit 25 determines that the storage roller 41 has rotated one revolution by detecting that the reference first recess 43a has rotated one revolution. The control unit 25 can grasp the positions of the first recess 43a and the second recess 43b by the amount of rotation of the motor and by providing markers (e.g., magnets, etc.) at the recess locations. However, the light reflected by the first recess 43a and the second recess 43b may be reflected toward the line sensor 53A. In this case, even if the control unit 25 detects the presence or absence of the yarn Y based on the detection result by the line sensor 53A, it cannot accurately detect it.

Therefore, the control unit 25 of this embodiment determines the presence or absence of the yarn Y on the outer peripheral surface 41d based on the detection results by the line sensor 53A at a position different from the first recess 43a and the second recess 43b. In detail, the control unit 25 determines the presence or absence of the yarn Y on the outer peripheral surface 41d based on the detection results by the line sensor 53A in all areas where the first recess 43a and the second recess 43b are not formed. More specifically, as shown in FIG. 5(C), the outer peripheral surface 41d of the storage roller 41 has a plurality of recesses (first recess 43a and second recess 43b) formed along the rotation direction of the storage roller 41, and a plurality of connection portions 41h, which are areas between adjacent recesses in the rotation direction, are formed. The control unit 25 determines the presence or absence of the yarn Y in the storage area A based on the detection results by the line sensor 53A in at least a portion of each of the plurality of connection portions 41h.

The control unit 25 may acquire data by the line sensor 53A in a state where the rotation of the storage roller 41 is stopped in an area where the first recess 43a and the second recess 43b are not present. The control unit 25 can grasp the position where the first recess 43a and the second recess 43b are not present by the amount of rotation of the motor or by providing a mark (e.g., a magnet) at the recess location. In other words, the control unit 25 may acquire data by the line sensor 53A while rotating the storage roller 41 intermittently. The control unit 25 may detect only the necessary locations by rotating the storage roller 41 at a low speed. Also, the control unit 25 may rotate the storage roller 41 to always have the line sensor 53A detect, and may not perform the process of determining the presence or absence of the yarn Y on the outer peripheral surface 41d only at the locations of the first recess 43a and the second recess 43b.

The effect of the winder unit 2 of the above embodiment will be described. In the winder unit 2 of the above embodiment, as shown in FIG. 4(A), the line sensor 53A that detects the yarn Y wound around the outer peripheral surface 41d of the storage roller 41 is configured by the line sensor 53A that detects the presence or absence of yarn in the straight section S1 that connects the upstream end in the yarn running direction and the downstream end in the yarn running direction on the outer peripheral surface 41d (storage area A). This makes it possible to detect the presence or absence of yarn Y in the straight section S1 in the storage area A without providing sensors that detect the presence or absence of yarn Y at each location in the storage area A. As a result, the storage amount V of yarn Y wound around the yarn storage device 40 can be detected with a simple configuration and at low cost.

As shown in FIG. 4(B), the winder unit 2 of the above embodiment has a light emitting section 55 that emits light toward the storage roller 41, so that the light received by the line sensor 53A can be adjusted in intensity (contrast), thereby improving the detection accuracy of the yarn Y by the control section 25.

As shown in FIG. 4(B), the light-emitting unit 55 of the winder unit 2 in the above embodiment has two light sources 55B, 55B and an optical waveguide 55C that converts the light emitted from the two light sources 55B, 55B into surface emission and emits it toward the storage roller 41, so that the light emitted from the light-emitting unit 55 can be made uniform. This improves the accuracy of detecting the yarn Y. In addition, as shown in FIG. 4(A), the line sensor 53A of the winder unit in the above embodiment is configured to receive light through a lens 53B that reduces the incident light, so that the detection unit 53 can be provided compactly.

As shown in FIG. 4(C), the line sensor 53A of the winder unit 2 in the above embodiment is positioned so that light from the light-emitting unit 55 reflecting the outer peripheral surface 41d of the storage roller 41 is not incident, and light from the light-emitting unit 55 reflecting the yarn Y stored in the storage roller 41 is incident. This improves the detection accuracy of the white yarn Y, which is easily reflective of the yarn Y wound around the storage roller 41. In detail, in the configuration of the winder unit 2 in the above embodiment, the presence or absence of the yarn Y is detected based on the reflected light only from the yarn Y stored in the storage roller 41, and the incidence of light reflected from parts other than the yarn Y on the line sensor 53A is reduced, thereby improving the detection accuracy of the yarn Y.

In the yarn storage device 40 of the winder unit 2 of the above embodiment, as shown in FIG. 4(C), a cover 47 is provided facing a part of the outer circumferential surface 41d of the storage roller 41, and the cover 47 is provided in a part of the traveling direction of the light from the light emitting unit 55 reflected by the outer circumferential surface 41d of the storage roller 41. This makes it possible to prevent the wind generated in the storage roller 41 from scattering in various places, and to control the airflow generated by the rotation of the storage roller 41, thereby preventing the yarn end from contacting the surrounding structure. Furthermore, since the opposing surface 47a of the cover 47, on which the light from the light emitting unit 55 is incident, is formed in black, the light from the light emitting unit 55 reflected by the outer circumferential surface 41d of the storage roller 41 can be absorbed. This reduces the incidence of light reflected from parts other than the yarn Y (external disturbance light) on the line sensor 53A, thereby improving the detection accuracy of the yarn Y by the control unit 25.

The control unit 25 of the winder unit 2 in the above embodiment rotates the storage roller 41 at least once and determines the presence or absence of yarn Y in the storage area A based on the detection result by the line sensor 53A when the storage roller 41 has rotated once. This makes it possible to detect the presence or absence of yarn Y in all areas of the outer circumferential surface 41d that constitutes the storage roller 41, thereby improving the accuracy of detection of yarn Y by the control unit 25.

In the winder unit 2, when a defect is found in the yarn Y, etc., and the yarn Y stored in the storage roller 41 is unwound or removed, the yarn Y may remain on the storage roller 41. If yarn splicing is started with the yarn Y remaining in this state and new yarn Y is stored in the storage roller 41, the yarn Y may become tangled or break. In the winder unit 2 of the above embodiment, when the control unit 25 confirms that the yarn Y is present, the operation of storing the yarn Y in the storage roller 41 may be prohibited. In this case, since the operation of storing the yarn Y in the storage roller 41 can be stopped in advance when the yarn Y remains on the storage roller 41, the yarn Y can be prevented from becoming tangled or breaking in the winder unit 2. In addition, when the control unit 25 confirms that the yarn Y is present, the operator may be notified of this fact.

In the above embodiment, the control unit 25 of the winder unit 2 determines that the storage roller 41 has rotated one revolution by detecting that the reference first recess 43a has rotated one revolution. This allows the control unit 25 to determine that the storage roller 41 has rotated one revolution in a simple manner.

The control unit 25 of the winder unit 2 in the above embodiment determines the presence or absence of the yarn Y in the storage area A based on the detection results of the line sensor 53A at a position different from the first recess 43a and the second recess 43b. This reduces the possibility of the control unit 25 erroneously determining the presence or absence of the yarn Y due to the first recess 43a and the second recess 43b being detected or not detected by the line sensor 53A.

The control unit 25 of the winder unit 2 in the above embodiment determines the presence or absence of yarn Y in the storage area A based on the detection results of the line sensor 53A at all positions where the first recess 43a and the second recess 43b are not formed. This improves the detection accuracy of yarn Y in a storage roller 41 in which the first recess 43a and the second recess 43b are formed on the outer circumferential surface 41d.

(Modification A1)
In the winder unit 2 of the above embodiment, the line sensor 53A is provided at a position where light from the light-emitting unit 55 reflecting the outer peripheral surface 41d of the storage roller 41 is not incident and light from the light-emitting unit 55 reflecting the yarn Y stored in the storage roller 41 is incident, as shown in Fig. 4C, but the present invention is not limited thereto. For example, the line sensor 53A may be provided at a position where light from the light-emitting unit 55 reflecting the outer peripheral surface 41d of the storage roller 41 is incident, as shown in Fig. 7A. In the configuration according to such modified example A1, the yarn Y wound around the storage roller 41 is less likely to reflect light, and detection accuracy of the yarn Y, particularly black (colored) yarn, can be improved.

In detail, for example, when the yarn Y is present on the outer peripheral surface 41d of the storage roller 41, the control unit 25 detects that the light emitted from the light emitting unit 55 is absorbed by the yarn Y and is not reflected toward the line sensor 53A. On the other hand, when the yarn Y is not present on the outer peripheral surface 41d of the storage roller 41, the light reflected by the outer peripheral surface 41d is reflected toward the line sensor 53A, and the light is detected by the line sensor 53A.

The detection results by the line sensor 53A at this time are acquired by the control unit 25 as data such as that shown in FIG. 8. In the data shown in FIG. 8, areas where a relatively large amount of light is detected, i.e. areas where a whitish image is acquired when converted to a BMP image, indicate areas where the thread (black thread) is not detected, and areas where a relatively small amount of light is detected, i.e. areas where a dark image is acquired when converted to a BMP image, indicate areas where the thread (black thread) is detected.

(Modification A2)
In the modification A1, an example in which the light-emitting unit 55 is disposed between the storage roller 41 and the cover 47 has been described, but in consideration of measures against wind fluff, control of the airflow caused by the rotation of the storage roller 41 (desiring to make the flow uniform in any direction), and collision of the yarn ends with the surrounding components, etc., there are circumstances in which it is desirable to avoid disposing unnecessary objects between the storage roller 41 and the cover 47 as much as possible. Therefore, as shown in Fig. 7(B), a slit 47b may be provided in the cover 47, and the light from the light-emitting unit 55 may be made to enter the storage roller 41 through the slit 47b, and the light from the light-emitting unit 55 reflected by the outer circumferential surface 41d of the storage roller 41 may be made to enter the line sensor 53A.

(Modification A3)
The above embodiment is a configuration suitable for use with a white-based yarn Y having a relatively high reflectance, and the above modified examples A1 and A2 are configurations suitable for use with a black-based (colored) yarn Y having a relatively low reflectance. In modified example A3, an example of a configuration suitable for use with a white-based yarn Y and a black-based (colored) yarn Y interchangeably will be described. For example, the winder unit 2 according to modified example A3 may be configured to detect both the white-based yarn Y and the black-based (colored) yarn Y by one line sensor 53A by adding the colored-yarn light-emitting unit 551 (55) which is the light-emitting unit 55 for detecting the black-based (colored) yarn Y according to modified example A2 and the cover 47 to the configuration of the above embodiment including the white-yarn light-emitting unit 552 (55) which is the light-emitting unit 55 for detecting the white-based yarn Y. However, in the case of such a configuration, when detecting the white-based yarn Y, the light emitted from the colored-yarn light-emitting unit 551 of the above embodiment may enter the slit 47b, adversely affecting the detection result by the line sensor 53A (causing erroneous detection). 9A, in the modified example A3, a door 48 is provided in the slit 47b, and an actuator (cylinder, solenoid, etc.) is used to open and close the door 48. The control unit 25 controls the actuator so that the door 48 opens when a black (colored) yarn Y is detected, and closes the door 48 when a white yarn Y is detected.

As described above, when detecting white yarn Y and when detecting black (colored) yarn Y, it is necessary to change whether the door 48 is open or closed and the yarn detection method (i.e., determining that yarn Y is present when light is detected and determining that yarn Y is present when light is not detected). The winder unit 2 according to the modified example A3 includes a control unit as a mode switching unit that can selectively switch between a white yarn detection mode, which is a detection mode for white yarn, and a colored yarn detection mode, which is a detection mode for colored yarn. 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 is present in the part where light is received by the line sensor 53A, and 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 is present in the part where light is not received by the line sensor 53A. The winder unit 2 according to variant A3 is configured to be able to set the detection mode via the machine control device 3 (or a device similar to the machine control device 3), for example, and by setting the mode, it is possible to switch between a door state and detection method suitable for detecting white yarn Y and a door state and detection method suitable for detecting black (colored) yarn Y.

In addition, instead of the configuration of modified example A3 having slit 47b and door 48, the end of cover 47 may be configured to be expandable, and the end of cover 47 may be controlled to shrink when detecting black (colored) yarn Y, and to expand when detecting white yarn Y. In addition, instead of door 48 or expandable cover 47, the operator may install a screen or the like depending on the type of yarn used (black or white).

(Modification A4)
The winder unit 2 according to Modification A4, like the winder unit 2 according to Modification A3, is an example of a configuration suitable for use when it is desired to alternate between a white-colored yarn Y and a black (colored) yarn Y. The configuration of the winder unit 2 according to Modification A4 differs from the configuration of the winder unit 2 according to Modification A3 in that, as shown in FIG 9(B) , a white-yarn detection line sensor 532 that detects light emitted by a white-yarn light-emitting unit 552 (55) and a colored-yarn detection line sensor 531 that detects light emitted by a colored-yarn light-emitting unit 551 (55) are provided.

The colored yarn light-emitting unit 551 irradiates light onto the outer peripheral surface 41d of the storage roller 41 through the slit 47b, and the colored yarn detection line sensor 531 is provided in a position where light from the colored yarn light-emitting unit 551 that reflects the outer peripheral surface 41d of the storage roller 41 is incident. The white yarn light-emitting unit 552 irradiates light onto the outer peripheral surface 41d of the storage roller 41, and the white yarn detection line sensor 532 is provided in a position where light from the white yarn light-emitting unit 552 that reflects the outer peripheral surface 41d of the storage roller 41 is not incident, and where light from the white yarn light-emitting unit 552 that reflects the yarn Y stored in the storage roller 41 is incident.

When using black (colored) yarn Y and when determining whether or not yarn Y is stored on the storage roller 41, the control unit 25 opens the door 48. When using white (colored) yarn Y or when determining whether or not black (colored) yarn Y is stored on the storage roller 41, the control unit 25 closes the door 48. This allows the white (colored) yarn Y to be used interchangeably with the black (colored) yarn Y in one winder unit 2.

A transparent window may be provided in the slit 47b, and in this case the transmittance of the transparent window may be, for example, 0.4 to 0.6. Note that the transparent window may also be used in the modified examples A2 and A3.

(Modification A5)
In the modified examples A3 and A4, an example of a configuration suitable for a case where a white-based yarn Y and a black (colored)-based yarn Y are interchangeably used has been described by taking a configuration in which a cover 47 is provided as the yarn pooling device 40 as an example, but a configuration without the cover 47 may also be used. For example, as shown in Fig. 10(A) and Fig. 10(B), a detection device 50 including a detection unit 53 and a light-emitting unit 55 may be provided so as to be movable relative to the pooling roller 41. The movement of the detection device 50 here includes at least one of horizontal movement and rotational movement. The detection device 50 may be configured to be manually movable, or may be configured to be movable by an actuator or the like.

In the winder unit 2 according to the modified example A5, when black (colored) yarn Y is used, as shown in FIG. 10(A), the detection device 50 is moved to a position where the light emitting unit 55 emits light to the outer peripheral surface 41d of the storage roller 41, and where the light from the light emitting unit 55 that reflects the outer peripheral surface 41d of the storage roller 41 is incident on the line sensor 53A. When white yarn Y is used, as shown in FIG. 10(B), the detection device 50 is moved to a position where the light emitting unit 55 irradiates light to the outer peripheral surface 41d of the storage roller 41, where the light from the light emitting unit 55 that reflects the outer peripheral surface 41d of the storage roller 41 is not incident on the line sensor 53A, and where the light from the light emitting unit 55 that reflects the yarn Y stored in the storage roller 41 is incident. In the winder unit 2 according to the modified example 4, white yarn Y and black (colored) yarn Y can be used interchangeably in one winder unit 2.

(Other Modification A)
In the above embodiment and the above modified examples A1 to A5, an example has been described in which a first recess 43a and a second recess 43b are formed on the outer peripheral surface 41d of the storage roller 41, but the first recess 43a and the second recess 43b may not be formed, or only one of the first recess 43a and the second recess 43b may be formed.

The method of detecting the yarn Y may also be changed depending on whether or not the first recess 43a and the second recess 43b on the outer circumferential surface 41d of the storage roller 41 are mirror-finished (plated).

For example, when the first recess 43a and the second recess 43b are mirror-finished (plated), the detection device 50 may be arranged as shown in FIG. 10(A) to detect black (colored) yarn Y. When detecting black (colored) yarn Y, it is preferable to use the detection result of the line sensor 53A in the area where the first recess 43a and the second recess 43b are not present, but this is not limited to this. Also, the detection device 50 may be arranged as shown in FIG. 10(B) to detect white yarn Y. When detecting white yarn Y, it is preferable to use the detection result of the line sensor 53A in the area where the first recess 43a and the second recess 43b are not present, but this is not limited to this.

For example, if there is no mirror finish (plating) on the first recess 43a and the second recess 43b, the white thread Y may be detected in an arrangement of the detection device 50 as shown in FIG. 10(A). When detecting the white thread Y, the white thread Y is detected by detecting the first recess 43a and the second recess 43b. Also, the detection device 50 may be arranged as shown in FIG. 10(B) to detect black (colored) thread Y. Note that in an arrangement as shown in FIG. 10(B), the white thread Y may be detected in the area where there is no first recess 43a and second recess 43b.

(4) Generation and detection of overlapped winding portion F on storage roller 41 (4-1)
In the winder unit 2 of this embodiment, during normal yarn winding operation, the yarn Y guided from the downstream yarn blow-off section 80 on the yarn supplying section 6 side to the tapered section 41a on one end side of the storage roller 41 is sequentially wound around the storage roller 41 while pushing up the previous yarn layer from one end side (upstream side) of the storage area A on the outer circumferential surface 41d of the storage roller 41 as the storage roller 41 rotates. The yarn Y already wound on the storage area A of the storage roller 41 is pushed by the newly wound yarn Y and sequentially sent to the other end side (downstream side). As a result, during normal yarn winding operation, the yarn Y is aligned in a spiral shape on the outer circumferential surface 41d of the storage roller 41 and regularly wound from the upstream end side to the downstream end side, as shown in FIG.

However, when such yarn feed is disturbed due to factors such as tension fluctuations, as shown in FIG. 12, the yarn Y may be wound not in a single layer but in two or more layers, resulting in an overlapping portion F of the yarn. The occurrence of such an overlapping portion F is undesirable. When an overlapping portion F occurs, the tension applied to the yarn Y becomes uneven, which may prevent the yarn from being steadily unwound from the storage roller, or the yarn may be subjected to stress, resulting in problems such as uneven yarn thickness or the yarn breaking.

Therefore, the inventors of the present disclosure conducted extensive research to detect such overlapping winding portions F. As a result, they discovered that when an overlapping winding portion F occurs on the outer peripheral surface 41d of the storage roller 41, the position of the upstream storage end E1 of the yarn moves toward the upstream end.

FIG. 14 shows the change over time in the position of the upstream storage end E1 of the yarn (corresponding to the distance D _E1 from the upstream end of the storage area A to the position of the upstream storage end E1 of the yarn as shown in FIG. 11) on the yarn storage roller 41, measured by the detection device 50 during the winding operation of the winder unit 2. Note that in FIGS. 14 to 19, the starting point of time is described for convenience, and time 0 does not indicate a specific time (for example, the time when the storage roller starts to rotate). Also, the position of the upstream storage end E1 on the vertical axis only indicates the relative position fluctuation, and is not the value of the distance D _E1 itself. Also, the upper side on the vertical axis of the graph corresponds to the downstream side in the storage area A, and the lower side on the vertical axis of the graph corresponds to the upstream side in the storage area A.

In FIG. 14, during time t1, the yarn is wound normally, and there is no significant change in the position of the upstream end E1 of the yarn storage. However, during time t2, an overlapping winding section F occurs, and the position of the upstream end E1 of the yarn storage moves significantly upstream, as shown by the arrow x1.

In this embodiment, such a change in the position of the upstream end E1 of the yarn storage is utilized to detect the occurrence of the yarn overlapped winding portion F. In other words, when the position of the upstream end E1 of the yarn storage moves upstream by a predetermined amount or more within a predetermined time (a decrease in the distance D _E1 ), it is determined that the overlapped winding portion F has occurred.

(4-2)
The basic details of the method for detecting the occurrence of the overlap winding portion F of the yarn according to this embodiment have been described above. However, in order to detect the overlap winding portion F with even greater accuracy, further improvements are required.

Figure 15 is an example showing the change in the position of the upstream storage end E1 before and after yarn splicing. In this case, the storage roller 41 is rotated in the reverse direction for yarn splicing. In Figure 15, the position of the upstream storage end E1 moves significantly downstream during the yarn splicing process, and then moves significantly upstream as indicated by the arrow x2. The position of the upstream storage end E1 after the yarn splicing is roughly the same as the position of the upstream storage end E1 before the yarn splicing. In other words, in the case of Figure 15, as in the case of Figure 14, there is a portion where the position of the upstream storage end E1 moves significantly upstream (the portion indicated by the arrow x2 in the figure), but in the case of Figure 15, no overlapping winding portion F of the yarn is formed.

Furthermore, a case where the detection of the occurrence of a yarn overlap winding portion F due to a simple lowering of the position of the upstream storage end E1 leads to a false detection will be described using Figures 16 to 18.

Figure 16 shows a case where a long defect in the yarn Y is detected and a long suction is performed from the upstream storage end E1 side to remove the yarn on the upstream storage end E1 side. In this case, during the long suction (time period t3 in Figure 16), the position of the upstream storage end E1 gradually moves downstream, and as normal winding operation is resumed after yarn splicing, the position of the upstream storage end E1 moves rapidly upstream, as shown by arrow x3. At this time, no overlapping portion F of the yarn has occurred. Therefore, if the rapid upstream movement of the position of the upstream storage end E1 is recognized as the occurrence of an overlapping portion F of the yarn, it will be an erroneous detection.

In Figure 17, there is a disturbance in the winding of the yarn on the storage roller, such as an overlapping portion F of the yarn, and when the worker manually removes the upstream storage end E1 side (the period indicated by time t4 in Figure 17), returns, and after yarn splicing, the winding operation is resumed, and the position of the upstream storage end E1 drops suddenly, as indicated by arrow x4 in Figure 17. In this case, too, the overlapping portion F of the yarn does not occur, and it would be an erroneous detection to recognize the sudden movement of the upstream storage end E1 upstream as the occurrence of the overlapping portion F of the yarn.

On the other hand, Figure 18 shows a case where the position of the upstream storage end E1 moves upstream (indicated by arrow x5 in Figure 18), it is determined that an overlapped yarn winding section F has occurred, the winding operation is stopped, and then the operation is restarted. In this case, the position of the upstream storage end E1 does not change significantly even when the winding operation is restarted (indicated by arrow x6 in Figure 18), but the overlapped yarn winding section F has more overlapping yarn wound on it.

(4-3)
Considering the above, the criteria for determining whether the position of the upstream storage end E1 has moved upstream, and whether the position of the upstream storage end E1 has moved upstream by a predetermined amount or more compared to the reference position, are added to the criteria for determining whether the overlapped portion F of the yarn has occurred. A specific example of FIG. 19 will be used for explanation. In FIG. 19, after the yarn splicing, the drive motor 45 for driving the storage roller 41 is turned on to start the winding operation. In FIG. 19, the position of the upstream storage end E1 is relatively stable, but at time t5, the position of the upstream storage end E1 drops sharply. At this time, the position of the upstream storage end E1 in the stable operating state of the winding operation before the yarn splicing is set as the reference position of the upstream storage end E1. The reference position is updated every time a stable winding operation is performed between yarn splices, and the latest reference position is used to determine whether the overlapped portion F of the yarn has occurred. The period of stable winding operation does not include the time from when the drive motor 45 for driving the storage roller 41 is turned on until the yarn breaks and the drive motor 45 is turned off, including the time immediately after the drive motor 45 is turned on and the time immediately before the drive motor 45 is turned off. In addition, during the time immediately after the drive motor 45 is turned on, no determination is made as to whether or not a yarn overlap winding portion F will occur.

The occurrence of the overlapped yarn portion F can be determined more accurately by determining that the overlapped yarn portion F has occurred when the position of the upstream storage end E1 moves upstream by a predetermined amount or more in a predetermined time, and also when the position of the upstream storage end E1 moves upstream by a predetermined amount or more compared to the reference position.

In other words, the method disclosed herein can detect the occurrence of overlapping windings F in the yarn in a simpler manner than directly observing the occurrence of overlapping windings F in the yarn, and can be applied to the control of the winder unit 2.

(5) Tension control after replacing the yarn supplying bobbin When the yarn on the yarn supplying bobbin is low and about to run out, the tension on the inlet side of the storage roller 41 (storage tension) becomes high. When the yarn supplying bobbin is then replaced, a new yarn supplying bobbin is set, and the winding operation is resumed, there is a high possibility that the yarn overlapping portion F will occur on the storage roller due to the sudden change in tension.

Therefore, in this embodiment, the yarn supply bobbin is replaced and the tension is set higher than during normal operation for a specified period of time. This control reduces the probability of the yarn overlapping winding portion F occurring on the storage roller.

More detailed explanations will be given with reference to FIG. 20. The target tension, the measured stored tension, and the rotation speed of the storage roller before and after replacing the yarn supplying bobbin are shown. The tension immediately before replacing the previous yarn supplying bobbin is measured, and the tension immediately after starting to use the new yarn supplying bobbin is controlled so that it is approximately the same as the measured tension. The tension control value is controlled to be the same as the tension immediately before replacement. However, since the tension at the start of winding is prone to fluctuation, if the deviation of the actual tension value is within the range of ±15 to 20%, it is acceptable as being able to be controlled to approximately the same value. Therefore, "the tension immediately after replacing the yarn supplying bobbin is approximately the same as the tension immediately before replacing the yarn supplying bobbin" means that the tension control value is controlled to be the same as the tension immediately before replacement, but if the actual tension value is controlled within the range of ±15 to 20%, the tension immediately after replacing the yarn supplying bobbin is treated as being the same as the tension immediately before replacing the yarn supplying bobbin.

This control reduces the probability of overlapping yarn windings F occurring on the storage roller.

(6) Operation method for removing the lap winding portion F (6-1)
The method for detecting the overlapped winding portion F of the yarn in the winder unit 2 of this embodiment has already been described. Here, the overlapped winding portion removal operation that is performed when the overlapped winding portion F of the yarn is detected will be described.

The method for winding operation of the winder unit 2 in this embodiment is shown in the flowchart in Figure 21.

In FIG. 21, first, in step S101, normal winding operation is performed.

Next, in step S102, the control unit determines whether winding has finished. If winding has finished, the winding operation flow ends. If winding has not finished, the process proceeds to step S103.

In step S103, the control unit determines whether or not overlapped winding section F has occurred based on the detection result of the detection device 50. If overlapped winding section F has not occurred, the process returns to step S101 and the winding operation continues. If overlapped winding section F has not occurred, the loop of steps S101 to S103 is repeated, and when it is determined in step S102 that winding has ended, winding ends.

If overlapping winding section F occurs in step S103, proceed to step S104.

In step S104, the overlap winding removal operation is performed for a predetermined time. The specific contents of the overlap winding removal operation will be described in detail later. Here, the predetermined time is set to a time that allows a large amount of overlap winding F to be removed. The predetermined time may be fixed, may be specified for each rod, or may be set appropriately based on feedback of the actual operating conditions.

The location where the overlap winding portion F occurs varies, and the amount of overlapping yarn in the overlap winding portion varies. The time required to completely remove the overlap winding portion F varies according to the degree of overlap winding in the overlap winding portion F. It is preferable that the specified time is not set so long that all overlap winding portions can be removed. It is usually set to the minimum time that can remove the most commonly occurring shape of overlap winding portion.

In step S104, the overlap winding portion removal operation is performed for a predetermined time, and then the process returns to step S101 and the winding operation is resumed. The process again proceeds to steps S101, S102, and S103. In step S103, it is determined again whether an overlap winding portion has occurred. If an overlap winding portion F has not occurred, the process returns to step S101 and the winding operation is continued.

If it is determined again in step S103 that overlap windings have occurred, the process proceeds to step S104 again, and overlap winding removal operation is performed for a predetermined time. In this way, even if overlap windings F cannot be removed in the first overlap winding removal operation and overlap windings are detected again immediately, overlap windings F may be removed in the second overlap winding removal operation. Even if overlap windings F cannot be removed the second time, overlap windings F may be removed by repeating the loop of steps S101 to S104 a third or fourth time or more.

In this way, the control unit executes a loop of steps S101 to S103 or a combination of steps S101 to S104, allowing efficient winding operation while removing overlapping winding portions as appropriate.

(6-2)
Next, the lap winding removing operation will be described in detail.

In the winder unit 2 of this embodiment, when the detection device 50 detects that the overlapping winding portion F occurs on the storage roller 41 during winding operation, the control unit 25 stops the rotation of the storage roller 41 and causes the cutter 15 to cut the yarn Y. The control unit 25 reverses the rotation direction of the storage roller 41 and rotates it at a relatively low speed. The control unit controls the suction mechanism to suck and remove the yarn wound around the storage roller 41 from the upstream storage end E1 side. The suction mechanism includes a downstream yarn blowing and sending unit 80. The downstream yarn blowing and sending unit 80 ejects compressed air to suck the yarn present on the storage area A of the storage roller 41 from the upstream storage end side. At this time, the traverse drum 24 is stopped or rotated at a low speed. In this manner, the storage roller 41 is rotated in the reverse direction for a predetermined time, and the yarn wound around the storage roller 41 is sucked and removed from the upstream end side, thereby removing the yarn Y on the upstream storage end E1 side, as shown in FIG. 13. This allows the overlapped winding portion F to be removed. After removing the yarn Y on the upstream storage end E1 side, the control unit 25 uses the yarn joining device 14 to join the yarn Y on the storage roller 41 side to the yarn Y on the yarn supply bobbin 21 side. Then, the storage roller 41 is rotated forward again, and the traverse drum 24 is rotated to perform normal winding operation.

As already explained in (6-1), the operation of rotating the storage roller 41 in the reverse direction and sucking and removing the yarn wound around the storage roller 41 from the upstream end side only needs to be performed for a predetermined time, and it is not always necessary to completely remove the overlapped winding portion F. Even if the overlapped winding portion F is completely removed, there are cases where the overlapped winding portion F is generated immediately after the normal winding operation is resumed. Therefore, as explained in (6-1), if the overlapped winding portion F is detected again, the overlapped winding portion removal operation is performed again.

As a method for removing the overlapped winding portion F formed on the storage roller 41, the method of removing the yarn from the upstream end of the storage area has the following features. First, this method is highly effective because it can almost completely remove defective parts caused by abnormal tension in the overlapped winding portion F, etc. Another advantage is that overlapped winding portions are unlikely to be formed again even if abnormal parts such as the overlapped winding portion F or yarn that is not abnormal but remains on the downstream side collides with the yarn wound on the upstream side when the machine is operated again. On the other hand, disadvantages include the fact that a lot of waste yarn is generated due to suction removal, and the fact that it takes a long time to rotate the storage roller in reverse at a low speed.

On the other hand, a method of removing the overlap winding portion F from the downstream end side can also be considered as a method of removing the overlap winding portion F. While rotating the traverse drum 24 and winding the yarn into a package, the storage roller 41 is stopped or rotated at a low speed to wind the yarn in the storage area from the upstream side. In this case, there are advantages such as no waste yarn being generated and the overlap winding portion F can be removed relatively quickly. However, when the overlap winding portion F is large or long, there is a high possibility that the removal will be insufficient. In addition, since the yarn remains on the upstream side of the storage area after the overlap winding portion removal operation, it is highly likely that the yarn will interfere with the yarn to be wound on the storage roller 41 next and the overlap winding portion F will be generated again. Therefore, in general, the method of suction removal from the upstream end side described above is preferable as a method of removing the overlap winding portion.

(Modification B1)
In the first embodiment, the detection device 50 includes a detection unit 53 and a light-emitting unit 55, and the detection unit 53 includes a line sensor 53A. In the modified example B1, as shown in Figs. 22(A) to (C), the detection device 50 includes a detection unit 53 and a light-emitting unit 55. The detection unit 53 includes a plurality of light-receiving sensors 533. The plurality of light-receiving sensors 533 are arranged in a line on the outer side of the outer circumferential surface 41d of the storage roller 41 along the extension direction of the rotation axis C1 of the storage roller 41. The light-emitting unit 55 is composed of a plurality of light sources 55B. The plurality of light sources 55B are arranged in a line on the outer side of the outer circumferential surface 41d of the storage roller 41 along the extension direction of the rotation axis C1 of the storage roller 41. An example of the light source 55B is an LED (Light Emitting Diode). The LED is provided on an LED board 55A. In the detection device 50 of the modification B1, the detection unit 53 and the light-emitting unit 55 perform the same functions as the detection unit 53 and the light-emitting unit 55 of the first embodiment.

(Modification B2)
23, in the modification B2, the detection device 50 is a video camera 540. The video camera 540 is disposed outside the outer circumferential surface 41d of the storage roller 41. The video camera 540 captures an image of the storage area A of the storage roller 41, and detects the upstream storage end E1 of the yarn. Similarly to the first embodiment, the detection device 50 detects a change in the position of the upstream storage end E1 of the yarn.

(Modification C1)
The yarn winding machine of the first embodiment uses an automatic winder with a yarn pooling device. The yarn winding machine of the modified example C1 may be an air spinning machine with a yarn pooling device. The air spinning machine spins yarn using the force of air. The air spinning machine is described, for example, in JP 2017-65896 A. The description of JP 2017-65896 A is incorporated herein in its entirety.

(Modification C2)
The yarn winding machine of the modified example C2 may be an open-end spinning machine with a yarn storage device. The open-end spinning machine spins the yarn by the rotational force of a rotor. The open-end spinning machine is described, for example, in JP-A-60-36268. The description of JP-A-60-36268 is incorporated herein in its entirety.

(7) Features of the embodiment The above embodiment can also be explained as follows.

The winder unit 2 (an example of a yarn winding machine) includes a yarn supplying section 6 (an example of a supplying section), a package forming section 8 (an example of a winding section), a yarn storage device 40, a detection device 50, and a control unit 25. The yarn supplying section 6 supplies yarn. The package forming section 8 winds the yarn supplied from the yarn supplying section 6 to form a package. A yarn running path along which the yarn Y runs is formed between the yarn supplying section 6 and the package forming section 8. The yarn storage device 40 has a storage roller 41 disposed in the middle of the yarn running path, and by rotating the storage roller 41, the yarn sent out from the yarn supplying section 6 is wound around the storage area a on the outer circumferential surface 41d of the storage roller 41 to temporarily store the yarn. The detection device 50 detects the yarn wound around the outer circumferential surface 41d of the storage roller 41. The control unit 25 controls the rotation of the storage roller 41, acquires detection data from the detection device 50, and determines whether or not an overlap winding section f has occurred in the storage area a.

2. Other embodiments Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the scope of the invention. In particular, the multiple embodiments and modifications described in this specification can be arbitrarily combined as necessary.

The yarn winding machine disclosed herein can be applied to the efficient production of high-quality packages.

1...automatic winder, 2...winder unit, 3...machine control device, 6...yarn supply section (supply section), 8...package formation section (winding section), 21...yarn supply bobbin, 22...winding bobbin, 25...control section, 40...yarn storage device, 41...storage roller, 41d...outer periphery, 43a...first recess, 43b...second recess, 45...drive motor, 47...cover, 50...detection device, 53...detection section, 53A...line sensor, 533...light receiving sensor, 540...video camera, 53B...lens, 55...light emitting section, 55B...light source, 55C...optical waveguide, A...storage area, E1...upstream storage end, Y...yarn.

Claims (15)

A supply unit that supplies a yarn;
a winding section for winding the yarn supplied from the supply section to form a package;
a yarn storage device including a storage roller disposed midway along a yarn traveling path along which the yarn travels between the supply unit and the winding unit, and configured to temporarily store the yarn by rotating the storage roller to wind the yarn delivered from the supply unit around a storage area on an outer circumferential surface of the storage roller;
a detection device for detecting the yarn wound around the outer peripheral surface of the storage roller;
a control unit that controls rotation of the storage roller, acquires detection data from the detection device, and determines whether a lap winding portion is generated in the storage area;
A yarn winding machine comprising: In the yarn traveling path, when the supply section side is an upstream side and the winding section side is a downstream side,
The detection device detects an upstream end position of the yarn wound around the storage area,
The yarn winding machine according to claim 1 , wherein the control unit determines whether or not a lap winding portion has occurred based on a storage upstream end position. In the yarn traveling path, when the supply section side is an upstream side and the winding section side is a downstream side,
The detection device detects an upstream end position of the yarn wound around the storage area,
2. The yarn winding machine according to claim 1, wherein the control unit determines whether or not a lap winding portion has occurred based on a movement of the upstream storage end position upstream and an amount of movement of the upstream storage end position upstream from a reference position. Further, a yarn joining device is provided between the supply section and the storage roller of the yarn traveling path,
4. The yarn winding machine according to claim 3, wherein the reference position is a position of the upstream end of the yarn storage detected by the detection device during a period when the yarn winding machine is stably winding the yarn before yarn joining by the yarn joining device and before the control unit determines that an overlapped winding portion has occurred. When the control unit determines that a lap winding portion has occurred in the storage area,
The yarn winding machine according to any one of claims 1 to 4, further comprising a overlap winding portion removal operation, in which a rotation speed of the storage roller is changed from that during a normal winding operation, and the overlap winding portion is removed. Further, a suction mechanism is provided to suck the yarn wound around the storage area from an upstream end position of the storage area,
6. The yarn winding machine according to claim 5, wherein, when the control unit determines that an overlapped winding portion has occurred in the storage area, the control unit performs a first overlapped winding portion removal operation in which the control unit reverses the storage roller for a predetermined time and removes the yarn wound in the storage area by suctioning it from an upstream storage end position. The yarn winding machine according to claim 6, wherein the control unit performs a normal yarn winding operation after the first overlap winding portion removal operation, and when it determines that an overlap winding portion has occurred again in the storage area, it further performs a second overlap winding portion removal operation in which the storage roller is rotated in the reverse direction for a predetermined time and the yarn wound in the storage area is sucked in and removed from the upstream storage end position. The yarn supplying device further includes a tension applying unit that applies a predetermined tension to the yarn between the supply unit and the yarn pooling device,
The supply unit is configured to supply the yarn by replacing a yarn supplying bobbin for supplying the yarn,
The yarn winding machine according to any one of claims 1 to 7, wherein when a normal winding operation is started immediately after replacing the yarn supplying bobbin, the control unit controls the tension applying unit so that a tension on an inlet side of the yarn into the storage area is higher than that during normal operation. Further comprising a tension sensor for detecting the tension of the yarn,
9. The yarn winding machine according to claim 8, wherein the control unit measures a tension with the tension sensor at an inlet side of the yarn into the yarn storage area before and after replacement of the yarn supplying bobbin, and controls the tension applying unit so that the tension immediately after replacing the yarn supplying bobbin is substantially the same as the tension immediately before replacing the yarn supplying bobbin. The yarn winding machine according to any one of claims 1 to 9, wherein the detection device includes a line sensor that detects the yarn in the storage area in a direction parallel to the rotation axis of the storage roller. The yarn winding machine according to any one of claims 1 to 9, wherein the detection device includes a camera that captures an image of the yarn in the storage area. The yarn winding machine according to any one of claims 1 to 9, wherein the detection device includes a plurality of light emitting and receiving sensors that detect the yarn in the storage area. The yarn winding machine according to any one of claims 1 to 11, wherein the yarn storage device is configured such that in the storage area, the downstream yarn is pushed by the upstream yarn and advances downstream. The yarn winding machine according to any one of claims 1 to 6, wherein the yarn winding machine is an air spinning machine. The yarn winding machine according to any one of claims 1 to 6, wherein the yarn winding machine is an open-end spinning machine.

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