Yarn winding device

Abstract

To provide a yarn winding device capable of cutting a yarn more stably than before.SOLUTION: A yarn winding device has a bobbin rotation part, a yarn cutting part, a nozzle, a nozzle rotation part, an air supply part, and a control device. The nozzle rotation part rotates the nozzle around a second axis to an opposite position where a tip of the nozzle faces the bobbin rotation part and a separated position where the tip of the nozzle is distant from the bobbin rotation part. The control device supplies air to the nozzle and makes the yarn inserted in a hollow part disposed at the opposite position pass through an opening of a bobbin case (S14). The control device drives the bobbin rotation part to wind the yarn around a bobbin (S15). After winding the yarn around the bobbin, the control device drives the nozzle rotation part to rotate the nozzle in a first rotation direction around the second axis (S24). The control device drives the yarn cutting part to cut the yarn in a state where the yarn is wound around outer periphery of the hollow part (S28).SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a yarn winding device. [Background technology]

[0002] The bobbin thread winding device in Patent Document 1 uses a thread insertion means to extract the end of the bobbin thread from a bobbin thread supply source by the length required to wrap around the cylindrical portion of the bobbin, and then inserts the end into the bobbin case through the bobbin case opening. The bobbin thread winding device causes the end of the bobbin thread inserted into the bobbin case by the thread insertion means to wrap around the cylindrical portion of the bobbin through cooperation between the bobbin thread wrapping means and bobbin rotation by the bobbin drive means. The bobbin winding device winds the bobbin thread around the bobbin housed in the bobbin case by rotating the bobbin with the end of the bobbin thread wrapped around it using the bobbin drive means. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 8-229262 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional yarn winding devices, after the lower thread is wound around the cylindrical portion of the bobbin, the thread is cut while it is drawn out from the tip of the nozzle by the length necessary to entangle the lower thread around the cylindrical portion of the bobbin. When the thread is cut, new thread is reeled out from the thread supply source, so the thread is not cut consistently.

[0005] An object of the present invention is to provide a yarn winding device that can cut a yarn more stably than conventional devices. [Means for solving the problem]

[0006] A yarn winding device according to claim 1 of the present invention includes a bobbin rotation unit that rotates a bobbin in a bobbin case in a winding direction around a first axis and winds a yarn supplied from a yarn supply source onto the bobbin, and a yarn cutting unit that cuts the yarn between the bobbin and the yarn supply source. The yarn winding device further includes a nozzle that has an opening formed on its outer surface for passing the yarn and a hollow portion through which the yarn passed through the opening is inserted, and that is held rotatably around a second axis. The nozzle is positioned on the second axis between an opposed position where a tip of the nozzle faces the bobbin rotation unit, and a remote position where the tip of the nozzle is further away from the bobbin rotation unit than when the nozzle is at the opposed position. the control device includes a nozzle rotation unit that rotates the nozzle around the second axis, an air supply unit that supplies air to the nozzle, the bobbin rotation unit, and a control device that controls the nozzle rotation unit and the air supply unit, wherein the control device supplies air to the nozzle to pass the yarn inserted in the hollow portion disposed at the opposing position through an opening of the bobbin case, drives the bobbin rotation unit to wind the yarn onto the bobbin, and after the yarn has been wound onto the bobbin, drives the nozzle rotation unit to rotate the nozzle in a first rotation direction around the second axis, and with the yarn wound around the outer periphery of the hollow portion, drives the yarn cutter to cut the yarn. The control device of the yarn winding device contributes to preventing new yarn from being supplied from a yarn supply source when cutting the yarn, thereby preventing the yarn from being cut in an unstable, bent state.

[0007] The control device for a yarn winding device according to claim 2 of the present invention drives the nozzle rotation unit to rotate the nozzle a predetermined amount in a second rotation direction opposite to the first rotation direction about the second axis when winding the yarn onto the next bobbin after cutting the yarn, slackening the yarn wound around the outer periphery of the hollow portion, and then supplies air to the nozzle to thread the yarn through the opening of the bobbin case. When winding the yarn onto the next bobbin after cutting the yarn, the control device for a yarn winding device prevents the yarn wound around the hollow portion from preventing the yarn from being supplied from the nozzle, contributing to ejecting the slackened yarn from the nozzle. The control device for a yarn winding device can adjust the length of the yarn when threading it from the nozzle into the opening of the bobbin case by changing the amount of yarn wound around the outer periphery of the hollow portion.

[0008] The predetermined amount of the thread winding device according to claim 3 of the present invention is an amount that causes the length of the thread to be wound around the hollow portion to be longer than the distance from the tip of the nozzle located at the opposing position to the outer periphery of the shaft of the bobbin rotation part plus the length of one circumference of the shaft. The control device of the thread winding device contributes to setting the length of the thread when threading the thread from the nozzle into the opening of the bobbin case to an appropriate length that will prevent the end of the thread from coming off the bobbin, depending on the distance from the tip of the nozzle located at the opposing position to the outer periphery of the shaft of the bobbin rotation part and the outer periphery of the shaft.

[0009] A non-slip surface is provided on the outer surface of the hollow portion of the yarn winding device according to claim 4 of the present invention. The hollow portion of the yarn winding device makes it less likely for the yarn wound around the hollow portion to slip than when no non-slip surface is provided, and this contributes to preventing the yarn from being cut in an unstable, bent state when new yarn is supplied from the yarn supply source when the yarn is cut.

[0010] In the yarn winding device according to claim 5 of the present invention, the yarn cutting unit is a blade formed at the tip of the nozzle and capable of cutting the yarn, and when cutting the yarn, the control device drives the nozzle rotating unit to rotate the nozzle from the facing position to the separated position, and cuts the yarn with the blade after the nozzle reaches the separated position. The blade of the yarn winding device contributes to simplifying the configuration of the yarn winding device compared to when a yarn cutting unit is provided separately from the nozzle.

[0011] In the control device for a yarn winding device according to claim 6 of the present invention, the nozzle rotation unit rotates the nozzle in the first rotation direction about the second axis to an excess position beyond the separated position, and then rotates in the direction opposite to the first rotation direction to position the nozzle at the separated position, and cuts the yarn with the blade portion after the nozzle reaches the separated position. By rotating the nozzle in the first rotation direction about the second axis until it passes the separated position, and then positioning it at the separated position, the control device for a yarn winding device generates slack in the yarn, which contributes to making it easier for the yarn to be guided to the blade portion formed at the tip of the nozzle. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view of a yarn winding device 1. [Figure 2] 1A is a front view of the yarn winding device 1 when the nozzle 21 is in the facing position P1, and FIG. 1B is a front view of the yarn winding device 1 when the nozzle 21 is in the separated position P2. [Figure 3] 1A is a plan view of the yarn winding device 1 when the nozzle 21 is in the facing position P1, and FIG. 1B is a plan view of the yarn winding device 1 when the nozzle 21 is in the separated position P2. [Figure 4] 1A is an oblique view of the bobbin 3 when the contact portion 318 of the contact-separating member 319 is not in contact with the outer surface 304 of the cylindrical portion 301, and FIG. 1B is an oblique view of the bobbin 3 when the contact portion 318 of the contact-separating member 319 is in contact with the outer surface 304 of the cylindrical portion 301, and an explanatory diagram of the projection plane U onto which the first flange portion 305 and the second flange portion 309 are projected. [Figure 5] FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 4(A). [Figure 6] (A) is an enlarged front view of the area around the bobbin rotating part 7 when the thread E is threaded between the cylindrical part 301 and the contact-separating member 319, and (B) is an enlarged front view of the area around the bobbin rotating part 7 when the thread E threaded between the cylindrical part 301 and the contact-separating member 319 is sandwiched between the cylindrical part 301 and the contact-separating member 319. [Figure 7] 2 is a block diagram showing the electrical configuration of a yarn supplying system 12 including the yarn winding device 1. FIG. [Figure 8] 1 is a flowchart of the main processing executed by the control device 9. [Figure 9] FIG. 10 is a perspective view of a bobbin case 404, a bobbin 403, and a nozzle 471 of a first modified example. [Figure 10] (A) is an oblique view of the bobbin 500 of the second modified example when the contact portion 522 of the contact-separating member 523 is not in contact with the outer surface 304 of the cylindrical portion 301, and an explanatory diagram of the projection plane W onto which the first flange portion 505 and the second flange portion 509 are projected, and (B) is an oblique view of the bobbin 500 when the contact portion 522 of the contact-separating member 523 is in contact with the outer surface 304 of the cylindrical portion 301. [Figure 11] (A) is a plan view of the bobbin 500 of the second modified example when the contact portion 522 of the contact-separating member 523 is not in contact with the outer surface 304 of the cylindrical portion 301, and (B) is a plan view of the bobbin 500 when the contact portion 522 of the contact-separating member 523 is in contact with the outer surface 304 of the cylindrical portion 301. [Figure 12] FIG. 10 is a perspective view of a bobbin 600 according to a third modified example. DETAILED DESCRIPTION OF THE INVENTION

[0013] A bobbin 3 and a yarn winding device 1 according to one embodiment of the present invention will be described with reference to the drawings. The up-down direction, lower-left direction, upper-right direction, upper-left direction, and lower-right direction in Fig. 1 correspond to the front-rear direction, left direction, right direction, upper direction, and lower direction of the yarn winding device 1, respectively.

[0014] 1 to 3 and 7, the yarn winding device 1 is fixed to a board 11 of a desk 10. The yarn winding device 1 includes a bobbin rotation unit 7, a bobbin case rotation unit 6, a nozzle 21, a yarn cutting unit 27, a support base 30, a nozzle rotation unit 2, an air supply unit 5, a discharge device 8, a control device 9, and a sensor unit 15.

[0015] The bobbin rotation unit 7 rotates the bobbin 3 (see FIG. 6 ) in the bobbin case 4 in a winding direction M around a first axis J1 to wind the thread E supplied from a thread supply source T onto the bobbin 3. The thread supply source T is, for example, a thread spool, and is supported on the rear side of the board 11 of the desk 10. The bobbin rotation unit 7 includes a rotating table 71, a motor 72, and a shaft 73. The rotating table 71 is cylindrical and centered on the first axis J1. The rotating table 71 detachably supports the bobbin 3. The rotating table 71 has a protrusion that engages with either a first groove 307 or a second groove 310 of the bobbin 3 (described later). The shaft 73 protrudes forward from the front surface of the rotating table 71 in a cylindrical shape centered on the first axis J1. The shaft 73 is inserted into the cylindrical portion 301 of the bobbin 3. The motor 72 is a stepping motor that can rotate forward and backward. The output shaft of the motor 72 is connected to the rotary table 71. When the motor 72 rotates, the rotary table 61 rotates together with the bobbin 3 inserted on the shaft 73, independently of the rotary table 71 described below.

[0016] The bobbin case rotating unit 6 rotates the bobbin case 4 around the first axis J1. The bobbin case rotating unit 6 includes a rotating table 61 and a motor 62. The rotating table 61 is cylindrical and has its center on the first axis J1, and is extrapolated onto the rotating table 71. The rotating table 61 detachably supports the bobbin case 4. The motor 62 is a stepping motor that can rotate forward and backward. The output shaft of the motor 62 is connected to the rotating table 61.

[0017] The nozzle 21 is a tubular member bent into an L shape that guides the yarn E drawn from the yarn supply source T toward the bobbin 3 held by the bobbin rotation unit 7. The nozzle 21 has a hollow portion 22 and a blade portion 28. The hollow portion 22 has a connecting portion 19, a supported portion 20, and a tip portion 24. The connecting portion 19 is the lower portion of the nozzle 21. A gear 39 of the nozzle rotation unit 2 is fitted onto the connecting portion 19. One end 52 of a tube 51 of the air supply unit 5 is connected to the lower end of the connecting portion 19.

[0018] The supported portion 20 is connected to the upper end of the connecting portion 19 and extends in the vertical direction. The supported portion 20 is supported by a support base 30. An anti-slip surface is provided on an outer surface 25 of the supported portion 20 in the hollow portion 22. The anti-slip surface may be, for example, an elastic material such as rubber, or a surface treatment such as knurling. An opening 26 is formed in the outer surface 25 of the hollow portion 22 to pass the thread E through. The hollow portion 22 is pulled out from a thread supply source T, and the thread E passed through the opening 26 is inserted into the interior of the hollow portion 22.

[0019] The tip portion 24 is connected to the upper end of the supported portion 20. The tip portion 24 is the upper portion of the nozzle 21. The nozzle 21 is bent in an L-shape so that the tip portion 24 of the hollow portion 22 in which the blade portion 28 is formed faces in a direction that is an angle of 65 degrees or more and 85 degrees or less with respect to the direction in which the second axis J2 extends. The yarn E that passes through the inside of the hollow portion 22 is discharged from the tip portion 24 of the hollow portion 22 toward the bobbin 3.

[0020] The blade portion 28 is formed at the tip 24 of the hollow portion 22 and is capable of cutting the yarn E. The blade portion 28 is a V-shaped notch formed at the tip 24 of the hollow portion 22. The blade portion 28 may be a notch of any shape other than a V-shape, such as a U-shaped notch, an R-shaped notch, or a square notch. The yarn cutting portion 27 cuts the yarn E between the bobbin 3 and the yarn supply source T. The yarn cutting portion 27 of this embodiment is the blade portion 28 formed at the tip 23 of the nozzle 21 and capable of cutting the yarn E.

[0021] The nozzle 21 is held by the support base 30 so as to be rotatable around a second axis J2. In this embodiment, the second axis J2 extends in the vertical direction. The support base 30 includes a base 31, a lower wall 35, and an upper wall 36. The base 31 is a plate-like member that is long in the left-right direction and extends vertically parallel to the board 11 of the desk 10. A hole 32 that penetrates in the front-to-rear direction is formed in the center of the base 31 in the left-to-right direction. The hole 32 passes through the thread E drawn from a thread supply source T supported behind the board 11 toward the front of the board 11. The left part of the base 31 is fixed to the board 11 by a screw 33. The right part of the base 31 is fixed to the board 11 by a screw 34.

[0022] The lower wall 35 extends forward from the lower end of the base 31. The upper wall 36 extends forward from the upper end of the base 31. The lower wall 35 and the upper wall 36 are triangular in shape with rounded corners in a plan view. The lower wall 35 has an insertion portion 37 that penetrates in the vertical direction. The upper wall 36 has an insertion portion 38 that penetrates in the vertical direction. The supported portion 20 of the nozzle 21 is inserted from above into the insertion portions 37, 38. The support base 30 supports the nozzle 21 at two points by the lower wall 35 and the upper wall 36. The connection portion 19 is located below the lower wall 35. The tip portion 24 is located above the upper wall 36.

[0023] The nozzle rotation unit 2 rotates the nozzle 21 around the second axis J2 between a facing position P1 where the blade portion 28 and the tip 23 of the nozzle 21 face the bobbin rotation unit 7 and a separated position P2 where the blade portion 28 and the tip 23 of the nozzle 21 are further away from the bobbin rotation unit 7 than when they are at the facing position P1. The nozzle rotation unit 2 of this embodiment can rotate the nozzle 21 one full rotation around the second axis J2. The nozzle rotation unit 2 includes a motor 41 and gears 39 and 40. The motor 41 is disposed behind the plate 11 of the desk 10. The motor 41 is a stepping motor that can rotate forward and backward. The output shaft 42 of the motor 41 extends in the front-rear direction, penetrating the plate 11 in the front-rear direction. The front end of the output shaft 42 is located forward of the plate 11, and the gear 40 is fitted around the output shaft 42. The gears 39 and 40 are straight bevel gears. The gear 40 meshes with the gear 39. The diameter of the gear 39 is larger than the diameter of the gear 40. The rotation axis of the gear 39 is the second axis J2, which is perpendicular to the direction in which the rotation axis of the gear 40 extends.

[0024] 7, the air supply unit 5 supplies air to the nozzle 21. The air supply unit 5 is, for example, an air compressor. The air supply unit 5 is connected to the other end 53 of the tube 51 via a valve switch .

[0025] As shown in FIGS. 1 to 3 and 7 , the discharge device 8 is provided to the right of the bobbin rotation unit 7. The discharge device 8 sucks in and discharges the yarn E wound around the bobbin 3 attached to the bobbin rotation unit 7 by the bobbin changing device 200. The discharge device 8 includes a main body 81, fixed plates 83 and 84, a pipe 87, a valve switch 89, and an air suction unit 90. The main body 81 is rectangular and elongated in the front-to-rear direction. A hole 82 penetrating the main body 81 in the left-to-right direction is formed. One end of the pipe 87, which communicates with the hole 82, is connected to the main body 81. The fixed plate 83 extends upward from the upper rear end of the main body 81. The fixed plate 84 extends downward from the lower rear end of the main body 81. The fixed plate 83 is fixed to the board 11 of the desk 10 by a screw 85. The fixed plate 84 is fixed to the board 11 by a screw 86. The air suction unit 90 sucks air. The air suction unit 90 is, for example, an air compressor. The air suction unit 90 is connected to the other end of the pipe 87 via a valve switch 89.

[0026] 7 is a programmable logic controller (PLC). The control device 9 controls the bobbin rotation unit 7, the bobbin case rotation unit 6, the nozzle rotation unit 2, the air supply unit 5, and the air suction unit 90.

[0027] 1, 2, and 7, the sensor unit 15 is provided below the bobbin rotation unit 7 and to the right of the nozzle rotation unit 2. The sensor unit 15 includes a winding completion sensor 98, a bobbin attachment sensor 99, and wiring 16. The winding completion sensor 98 and the bobbin attachment sensor 99 are, for example, optical proximity sensors. The wiring 16 is connected to the winding completion sensor 98 and the bobbin attachment sensor 99.

[0028] As shown in Figures 1 to 3, the bobbin case 4 houses a bobbin 3 around which a thread E is wound. The bobbin case 4 includes a leaf spring 47 and a lever 48. Openings 45, 46 and a groove 49 are formed in the side wall of the bobbin case 4. The leaf spring 47 applies an appropriate tension to the thread E pulled out from the groove 49 of the bobbin case 4 by pressing against it. The lever 48 is operated when removing the bobbin case 4 from the sewing machine 100 of Figure 7. The openings 45, 46 are formed in the side wall of the bobbin case 4. The openings 45, 46 are spaced apart around the first axis J1.

[0029] 4 and 5, the bobbin 3 includes a cylindrical portion 301, a first flange portion 305, a second flange portion 309, and a contact-separation member 319. The cylindrical portion 301 extends in the axial direction K. At least a portion of the outer surface 304 of the cylindrical portion 301 that comes into contact with the contact-separation member 319 is knurled. Knurling can be done by rolling or cutting, and either method may be used.

[0030] The first flange 305 is connected to one end 302 of the cylindrical portion 301 in the axial direction K, and is disk-shaped with a diameter larger than the diameter of the cylindrical portion 301. In this embodiment, the one end 302 is the front end of the cylindrical portion 301. In the first flange 305, a first groove 307 is formed that extends in a first direction D1 away from the cylindrical portion 301 along a first straight line J4 that passes through the axis J3 of the cylindrical portion 301 in an imaginary plane perpendicular to the axial direction K.

[0031] The second flange 309 is connected to the other end 303 of the cylindrical portion 301 in the axial direction K and has a disk shape with a diameter larger than that of the cylindrical portion 301. In this embodiment, the other end 303 is the rear end of the cylindrical portion 301. In a virtual plane perpendicular to the axial direction K, a projection plane U of the first flange 305 and the second flange 309 is formed. The second flange 309 has a second groove 310 extending parallel to the first straight line J4 from the cylindrical portion 301 in a second direction D2 opposite to the first direction D1. The diameters of the first flange 305 and the second flange 309 are the same. The diameters of the first flange 305 and the second flange 309 are more than twice the diameter of the cylindrical portion 301.

[0032] The contact-and-separation member 319 is a metal rod-shaped member bent into a U-shape. The thickness of the contact-and-separation member 319 is preferably 0.3 mm or more and 1.0 mm or less. In this embodiment, the thickness of the contact-and-separation member 319 is 0.4 mm, for example. The contact-and-separation member 319 is supported by the first flange portion 305 so as to be able to contact and separate from the outer surface 304 of the cylindrical portion 301.

[0033] The approaching and separating member 319 has a first arm portion 314, a contact portion 318, and a second arm portion 316. The first arm portion 314 is rotatably supported by the first flange portion 305. The contact portion 318 is connected to the first arm portion 314 and can approach and separate from the outer surface 304 of the cylindrical portion 301 in response to rotation of the first arm portion 314. The second arm portion 316 is connected to the contact portion 318, faces the first arm portion 314, and is rotatably supported by the second flange portion 309. On a projection plane U on which the first flange portion 305 and the second flange portion 309 are projected on an imaginary plane perpendicular to the axial direction K, that is, in a front view, a fulcrum 315 of the first arm portion 314 and a fulcrum 317 of the second arm portion 316 are each formed on a second line J5 that passes through the axis J3 of the cylindrical portion 301 and is perpendicular to the first line J4. The fulcrums 315 and 317 are on the same straight line parallel to the axis J3. In other words, the first flange 305 and the second flange 309 have symmetrical shapes in the front-to-rear direction, except that the first groove 307 and the second groove 310 extend in opposite directions. Therefore, regardless of whether the first groove 307 or the second groove 310 is used as a reference when attaching the bobbin 3 to the bobbin rotation part 7, the arrangement of the fulcrums 315 and 317 relative to the bobbin rotation part 7 is the same.

[0034] The thread supply system 12 will be described with reference to Figure 7. The thread supply system 12 includes a sewing machine 100, a bobbin changing device 200, and a thread winding device 1. The sewing machine 100 is, for example, an industrial sewing machine with a vertical shuttle, and includes a sewing machine control circuit 101 and a bobbin thread remaining amount sensor 102. The sewing machine control circuit 101 is connected to the bobbin thread remaining amount sensor 102 and the control device 9. The bobbin thread remaining amount sensor 102 detects the amount of thread E wound around the bobbin 3 in the shuttle.

[0035] The bobbin changing device 200 removes a bobbin case 4 containing a used bobbin 3 from the shuttle of the sewing machine 100, and attaches a bobbin case 4 containing a bobbin 3 around which thread E is wound to the shuttle. The bobbin changing device 200 includes a drive circuit 201, a motor 202, valve switches 203 and 205, air cylinders 204 and 206, and a cylinder sensor 207. The control device 9 is connected to the drive circuit 201, the valve switches 203 and 205, and the cylinder sensor 207. The drive circuit 201 controls the motor 202 in accordance with a control signal from the control device 9. The valve switch 203 is connected to the air cylinder 204, and controls the air supplied to the air cylinder 204 in accordance with a control signal from the control device 9. The air cylinder 204 drives an attachment / detachment mechanism that attaches and detaches the bobbin 3 and bobbin case 4 between the sewing machine 100 and the thread winding device 1. The cylinder sensor 207 inputs a signal indicating the drive amount of the air cylinder 204 to the control device 9. The valve switch 205 is connected to the air cylinder 206, and controls the air supplied to the air cylinder 206 in accordance with a control signal from the control device 9. The air cylinder 206 drives a gripping mechanism that grips the bobbin 3 and the bobbin case 4.

[0036] The thread winding device 1 includes a control device 9, drive circuits 95-97, motors 41, 62, 72, valve switches 54, 89, an air supply unit 5, an air suction unit 90, a winding completion sensor 98, and a bobbin attachment sensor 99. The control device 9 controls the sewing machine 100 and the bobbin replacement device 200 in addition to the thread winding device 1. The control device 9 is connected to the drive circuits 95-97, the valve switches 54, 89, the winding completion sensor 98, and the bobbin attachment sensor 99. The drive circuit 95 controls the motor 41 in accordance with a control signal from the control device 9. The drive circuit 96 controls the motor 62 in accordance with a control signal from the control device 9. The drive circuit 97 controls the motor 72 in accordance with a control signal from the control device 9. The valve switch 54 controls the air supplied from the air supply unit 5 in accordance with a control signal from the control device 9. The valve switch 89 controls the suction of the air suction unit 90 in accordance with a control signal from the control device 9. The winding completion sensor 98 inputs a signal indicating whether winding of the yarn E onto the bobbin 3 has been completed, which corresponds to the amount of yarn wound onto the bobbin 3 attached to the bobbin rotating unit 7, to the control device 9. The bobbin attachment sensor 99 inputs a signal indicating whether the bobbin 3 has been attached to the bobbin rotating unit 7 by the bobbin changing device 200, to the control device 9.

[0037] An overview of the processing executed by the thread supply system 12 will be described. When the amount of thread E detected by the bobbin thread remaining amount sensor 102 becomes equal to or less than a predetermined amount, the control device 9 controls the bobbin changing device 200 to remove the bobbin 3 and bobbin case 4 from the shuttle of the sewing machine 100 and attach them to the thread winding device 1. The control device 9 controls the thread winding device 1 to wind the thread E onto the bobbin 3 attached by the bobbin changing device 200. The control device 9 controls the bobbin changing device 200 to attach the bobbin 3 and bobbin case 4 around which the thread E is wound into the shuttle of the sewing machine 100.

[0038] 2 to 9, a description will be given of the main processing executed by the control device 9 of the thread supplying system 12. When the power supply is turned on, the control device 9 starts a program and executes the main processing shown in FIG.

[0039] The control device 9 detects that the remaining amount of thread E on the bobbin 3 attached to the shuttle of the sewing machine 100 is equal to or less than a predetermined amount based on a signal output from the sewing machine control circuit 101 of the sewing machine 100 in response to the detection result of the bobbin thread remaining amount sensor 102 (S1). The control device 9 drives the bobbin changing device 200 to remove the bobbin 3 and bobbin case 4 attached to the sewing machine 100 from the sewing machine 100 (S2). The control device 9 drives the bobbin changing device 200 to attach the bobbin 3 and bobbin case 4 around which the thread E is wound to the sewing machine 100 (S3). In this embodiment, the bobbin 3 removed from the sewing machine 100 in S2 and the bobbin 3 attached to the sewing machine 100 in S3 are different bobbins. In the thread supply system 12, two sets of bobbins 3 and bobbin cases 4 are alternately attached to the sewing machine 100, so that while the process of winding thread E onto one bobbin 3 is being performed, sewing can be performed by the sewing machine 100 using the other bobbin 3.

[0040] The control device 9 drives the bobbin changing device 200 to mount the bobbin 3 removed from the sewing machine 100 in S2 onto the bobbin rotation unit 7 and the bobbin case rotation unit 6 (S4). The control device 9 determines whether or not the bobbin 3 has been detected as being mounted by the bobbin mounting sensor 99 (S5). If the bobbin 3 is properly mounted onto the bobbin rotation unit 7 and the bobbin case rotation unit 6 in S4, the bobbin mounting sensor 99 detects that the bobbin 3 has been mounted. If the bobbin 3 is not properly mounted (S5: NO), the control device 9 performs an error stop (S6), and the main processing ends. In S6, the operator can confirm that the bobbin 3 is properly mounted onto the bobbin rotation unit 7 and the bobbin case rotation unit 6, and then resume the processing.

[0041] If the attachment of the bobbin 3 is detected (S5: YES), the control device 9 drives the bobbin rotating unit 7 to rotate the bobbin 3 a certain number of times in the winding direction M, and then stops it (S7). The control device 9 controls the valve switch 89 to start suction by the discharge device 8 (S8). The control device 9 controls the valve switch 54 to start supplying air to the nozzle 21 (S9).

[0042] The control device 9 drives the bobbin rotation unit 7 to rotate the bobbin 3 a predetermined number of times in the discharge direction opposite to the winding direction M, and then stops it at a predetermined position (S10). By the processing of S10, the yarn E wound around the bobbin 3 attached to the bobbin rotation unit 7 is sucked into the piping 87. The predetermined position is a position where the contacting and separating member 319 of the bobbin 3 is below the second axis J2. Due to gravity, the contacting and separating member 319 moves away from the outer surface 304 of the cylindrical portion 301 and extends rightward from the fulcrums 315, 317 of the contacting and separating member 319. The bobbin case 4 is oriented such that the opening 45 faces the tip 23 of the nozzle 21.

[0043] The control device 9 drives the valve switch 89 to stop suction by the discharge device 8 (S11). The control device 9 drives the valve switch 54 to stop the supply of air to the nozzle 21 (S12). The control device 9 drives the nozzle rotation unit 2 to rotate the nozzle 21 a predetermined number of times in the second rotation direction R2, and then positions the nozzle 21 at the opposing position P1 (S13). By rotating the nozzle 21 a predetermined number of times in the second rotation direction R2, the yarn E that had been wound around the supported portion 20 of the nozzle 21 is unwound, and a slack in the yarn E is created between the nozzle 21 and the yarn supply source T.

[0044] The control device 9 supplies air to the nozzle 21 using the air supply unit 5, and passes the yarn E inserted into the hollow portion 22 of the nozzle 21 arranged at the opposing position P1 through the opening 45 of the bobbin case 4 (S14). Specifically, the control device 9 starts supplying air to the nozzle 21 (S14). As shown in FIG. 6(A), when air is supplied to the nozzle 21, the yarn E inserted into the nozzle 21 is blown out from the nozzle 21 along the spray direction F toward the hole 82 of the discharge device 8 by the amount unwound in S13. The spray direction F is a direction along the extension direction of the tip portion 24, and when the nozzle 21 is at the opposing position P1, the spray direction F is upward and to the right.

[0045] The control device 9 drives the bobbin rotation unit 7 to rotate the bobbin 3 in a winding direction M, which is the opposite direction to the jetting direction F in which air supplied by the air supply unit 5 is jetted toward the bobbin 3 from the nozzle 21 disposed at the opposing position P1 (S15). In S15, the control device 9 drives the bobbin rotation unit 7 to wind the yarn E supplied from the yarn supply source T onto the bobbin 3 through the hollow portion 22 of the nozzle 21 disposed at the opposing position P1. The contacting and separating member 319 approaches the cylindrical portion 301. As shown in FIG. 6(B) , the yarn E is sandwiched between the contacting and separating member 319 and the cylindrical portion 301 and is pressed toward the cylindrical portion 301 by the contacting and separating member 319. As the bobbin 3 rotates in this state in the winding direction M, the yarn E supplied from the nozzle 21 is wound around the contact portion 318, which is disposed at the opposing position P1, and the cylindrical portion 301.

[0046] In order to wind the yarn E evenly in the front-to-rear direction, the control device 9 drives the nozzle rotation unit 2 to swing the nozzle 21 around the second axis J2 by ​​a predetermined angle with the opposing position P1 as the reference (S16). The predetermined angle may be set in advance and is, for example, within a range of plus or minus 10 degrees around the second axis J2 with the opposing position P1 as the reference.

[0047] The control device 9 determines whether a predetermined amount of yarn E has been wound around the bobbin 3 based on the output of the winding completion sensor 98 (S17). If the completion of winding is not detected (S17: NO), the control device 9 returns the process to S16. If the completion of winding is detected (S17: YES), the control device 9 stops driving the bobbin rotation unit 7 and stops the rotation of the bobbin 3 (S21).

[0048] The control device 9 drives the bobbin case rotation unit 6 and the nozzle rotation unit 2 to rotate the bobbin case 4 and the nozzle 21 to thread the yarn E through the groove 49 of the bobbin case 4 (S22). The control device 9 rotates the bobbin 3 a predetermined amount in the discharge direction opposite to the winding direction M (S23). By rotating the bobbin 3 in the discharge direction, the control device 9 creates slack in the yarn E between the bobbin 3 and the tip 23 of the nozzle 21, so that the yarn E does not interfere with the rotation of the nozzle 21 even when the nozzle 21 rotates to the separated position P2. After winding the yarn E onto the bobbin 3, the control device 9 drives the nozzle rotation unit 2 to rotate the nozzle 21 a predetermined number of times in the first rotation direction R1 about the second axis J2 (S24). As a result of S24, the yarn E is wound around the supported portion 20 of the nozzle 21. Since a non-slip surface is arranged on the outer surface 25 of the supported portion 20, when the thread E is wound around the supported portion 20 of the nozzle 21, the nozzle 21 and the thread E are locked together.

[0049] The control device 9 drives the nozzle rotation unit 2 to rotate the nozzle 21 in the first rotation direction R1 about the second axis J2 to an excess position P3 beyond the distant position P2 (S25). Thereafter, the control device 9 supplies air to the nozzle 21 by the air supply unit 5 (S26). As a result of the processing of S26, even if the yarn E is stuck to the inner periphery of the nozzle 21, the air supplied to the nozzle 21 causes the yarn E to peel off from the inner periphery of the nozzle 21 and spread out.

[0050] The control device 9 rotates the nozzle 21 in a second rotation direction R2 opposite to the first rotation direction R1, and positions the nozzle 21 at the distant position P2 (S27). The distant position P2 is a position rotated 135 degrees or more and 180 degrees or less around the second axis J2 from the facing position P1. In this embodiment, the distant position P2 is a position rotated 180 degrees around the second axis J2 from the facing position P1. The control device 9 returns the nozzle 21, which is positioned at the excess position P3, to the distant position P2, thereby making it easier for the yarn E to be positioned at the blade portion 28.

[0051] After moving the nozzle 21 to the separated position P2, the control device 9 cuts the yarn E with the blade unit 28. Specifically, the control device 9 drives the bobbin rotation unit 7 to rotate the bobbin 3 a predetermined amount in the winding direction M (S28). The control device 9 may also drive the bobbin case rotation unit 6 to rotate the bobbin 3 together with the bobbin case 4 a predetermined amount in the winding direction M. In S28, the control device 9 drives the yarn cutting unit 27 to cut the yarn E in a state in which the yarn E is wound around the outer periphery of the hollow portion 22. The predetermined amount is an amount such that the length of the yarn E wound around the hollow portion 22 is longer than the distance from the tip 23 of the nozzle 21, which is at the opposing position P1, to the outer periphery of the shaft 73 of the bobbin rotation unit 7 plus the length of one revolution around the outer periphery of the shaft 73.

[0052] The control device 9 controls the bobbin changing device 200 to grip the wound bobbin 3 and the bobbin case 4 (S29). The wound bobbin 3 and the bobbin case 4 are removed from the thread winding device 1 by the bobbin changing device 200 and are attached to the sewing machine 100 in the next S3. The control device 9 determines whether or not to end the main process (S30). The control device 9 ends the main process when, for example, the power is switched from ON to OFF. If the main process is not to be ended (S30: NO), the control device 9 returns the process to S1. If the main process is to be ended (S30: YES), the control device 9 ends the main process.

[0053] After cutting the yarn E (S28), when winding the yarn E onto the next bobbin 3 (S30: NO), the control device 9 drives the nozzle rotation unit 2 to rotate the nozzle 21 a predetermined amount in a second rotation direction R2 about the second axis J2 that is opposite to the first rotation direction R1 (S13). After slackening the yarn E wound around the outer periphery of the hollow portion 22, the control device 9 supplies air to the nozzle 21 to pass the yarn E through the opening 45 of the bobbin case 4 (S14).

[0054] With reference to FIG. 9 , the tip 474 of the nozzle 471, the bobbin 403, and the bobbin case 404 of the thread winding device of the first modified example will be described. The thread winding device of the first modified example has a configuration in which the board 11 of the desk 10 of the above-described embodiment is installed horizontally, and is installed so that the up-down direction and the front-to-back direction of the above-described embodiment are the rear-to-front direction and the up-down direction. The first modified example is equipped with a bobbin 403 and a bobbin case 404 used in a sewing machine different from that of the above-described embodiment. Although not shown in detail, in the thread winding device of the first modified example, the bobbin rotation unit 7 and the bobbin case rotation unit 6 are disposed to the right of the second axis J2 of the nozzle 471. As shown in FIG. 9 , the position where the tip 474 of the nozzle 471 is disposed to the right of the second axis J2 is the facing position Q.

[0055] Although not shown in detail, the nozzle 471 of the first modified example has a connecting portion 19 and a supported portion 20 similar to those of the nozzle 21 of the above embodiment, and a tip portion 474 different from those of the nozzle 21 of the above embodiment. The tip portion 474 of the nozzle 471 is connected to the rear end of the supported portion 20 similar to that of the nozzle 21 of the above embodiment. The tip portion 474 is the rear portion of the nozzle 471. The nozzle 471 is bent in an L-shape so that the tip portion 474, on which the cutting portion 478 is formed, faces in an angle of 65 degrees or more and 85 degrees or less with respect to the direction in which the second axis J2 extends. The yarn E that passes through the inside of the nozzle 471 is discharged from the tip portion 474 of the nozzle 471 toward the bobbin 403.

[0056] The blade portion 478 is a V-shaped notch formed in the tip portion 474. The blade portion 478 may be a notch of any shape other than a V-shape, such as a U-shaped notch, an R-shaped notch, or a square notch. The blade portion 478 is formed on the opposite side to the first axis J1 with respect to an imaginary plane that passes through the center C of the hollow portion 472 at the opposing position Q and is parallel to the first axis J1. In a plan view, the first axis J1 is located in front of the center C of the hollow portion 472, and the blade portion 478 is located behind the center C.

[0057] The bobbin case 404 houses a bobbin 403 around which a thread E is wound. The bobbin case 404 is equipped with a leaf spring (not shown) and a lever 48. An opening 445 and a groove (not shown) are formed in the side wall of the bobbin case 404. The leaf spring presses the thread E pulled out from the groove of the bobbin case 404 to apply an appropriate tension to the thread E. The lever 48 is operated when removing the bobbin case 404 from the sewing machine. The opening 445 is formed in the side wall of the bobbin case 4. The opening 445 extends approximately halfway around the first axis J1 in the side wall of the bobbin case 4.

[0058] The bobbin 403 has a configuration similar to that of the bobbin 3, and includes a cylindrical portion 411, a first flange portion 415, a second flange portion 419, and a contact / separation member 429. The cylindrical portion 411 extends in the axial direction K. The first flange portion 305 is connected to the upper end of the cylindrical portion 411 in the axial direction K and is disk-shaped with a diameter larger than that of the cylindrical portion 411. The second flange portion 419 is connected to the lower end of the cylindrical portion 411 in the axial direction K and is disk-shaped with a diameter larger than that of the cylindrical portion 411.

[0059] The contact-and-separation member 429 is a metal rod-shaped member bent into a U-shape. The thickness of the contact-and-separation member 429 is preferably 0.3 mm or more and 1.0 mm or less. For example, the thickness of the contact-and-separation member 429 in the first modified example is 0.4 mm. The contact-and-separation member 429 is supported by the first flange 415 so as to be able to contact and separate from the outer surface 410 of the cylindrical portion 411. The contact-and-separation member 429 has a first arm portion 424, a contact portion 428, and a second arm portion 426. The first arm portion 424 is pivotally supported by the first flange 415 so as to be able to rotate. The contact portion 428 is connected to the first arm portion 424 and is able to contact and separate from the outer surface 410 of the cylindrical portion 411 in response to the rotation of the first arm portion 424. The second arm portion 426 is connected to the contact portion 428, faces the first arm portion 424, and is rotatably supported by the second flange portion 419. A fulcrum 430 of the first arm portion 424 is inserted into the insertion portion 416 of the first flange portion 415, and a fulcrum 427 of the second arm portion 426 is inserted into the insertion portion 421 of the second flange portion 419.

[0060] The yarn winding device of the first modified example includes a magnetic force generator (not shown) behind the bobbin case 404, and the magnetic force generator can be switched between an ON state in which it generates magnetic force and an OFF state in which it does not generate magnetic force as needed. The yarn winding device of the first modified example can retract the contacting / separating member 429 rearward by causing the magnetic force generator to generate magnetic force, thereby separating the contact portion 428 from the outer surface 410 of the cylindrical portion 411, as shown in FIG. 9. When threading the yarn E between the cylindrical portion 411 of the bobbin 403 and the contacting / separating member 429 in a process similar to S26 of the main process of the above embodiment, by turning the magnetic force generator on and generating magnetic force, the contacting / separating member 429 is positioned radially farther from the first axis J1 than the side wall of the bobbin case 404, as shown in FIG. 9. For this reason, in the yarn winding device of the first modified example, it is not necessary to pass the yarn E through the opening 445 of the bobbin 403. For example, the yarn E can be passed between the first arm portion 424 and the second arm portion 426 of the U-shaped approaching and separating member 429 that opens toward the first axis J1 in the axial direction K. After passing the yarn E through, the magnetic force generator is turned off, and when the bobbin 403 is rotated in the winding direction M, it is positioned closer to the first axis J1 than the side wall of the bobbin case 404, and the contact portion 428 comes into contact with the outer surface 410 of the cylindrical portion 411.

[0061] A bobbin 500 of a second modified example will be described with reference to FIGS. 10 and 11 . In FIGS. 10 and 11 , the same reference numerals are used to designate components similar to those of the bobbin 3 of the above-described embodiment. The bobbin 500 includes a cylindrical portion 301, a first flange 505, a second flange 509, and a contact / separation member 523. The first flange 505 is connected to the front end of the cylindrical portion 301 in the axial direction K and is disk-shaped with a diameter larger than that of the cylindrical portion 301. A first groove 307 and a first guide groove 527 are formed in the first flange 505. In a projection plane W obtained by projecting the first flange 505 and the second flange 509 onto an imaginary plane perpendicular to the axial direction K, the first groove 307 extends in a first direction D1 away from the cylindrical portion 301 along a first straight line J4 that intersects with the axis J3 of the cylindrical portion 301. The second flange 509 is connected to the rear end of the cylindrical portion 301 in the axial direction K and has a disk shape with a diameter larger than that of the cylindrical portion 301. A second groove 310 and a second guide groove 528 are formed in the second flange 509. In a virtual plane perpendicular to the axial direction K, in a projection plane W in which the first flange 505 and the second flange 509 are projected, the second groove 310 extends along a first straight line J4 from the cylindrical portion 301 in a second direction D2 opposite to the first direction D1. The second guide groove 528 faces the first guide groove 527. In a virtual plane perpendicular to the axial direction K, in a projection plane W in which the first flange 505 and the second flange 509 are projected, the first guide groove 527 and the second guide groove 528 are formed along a second straight line J5 that intersects with the axis J3 of the cylindrical portion 301 and is perpendicular to the first straight line J4. In the bobbin 500, the contacting / separating member 523 is supported by the first flange 505 and the second flange 509 so as to be slidable along the first guide groove 527 and the second guide groove 528.

[0062] A bobbin 600 of a third modified example will be described with reference to FIG. 12 . In FIG. 12 , the same reference numerals are used to designate components similar to those of the bobbin 3 of the above embodiment. The bobbin 600 differs from the bobbin 3 of the above embodiment in that it includes a contact-separation member 619 instead of the contact-separation member 319 of the bobbin 3 of the above embodiment. At least a portion of the contact-separation member 619 is formed of a flexible string-like member. The string-like member may be, for example, thread or rubber. A front end 615 of the contact-separation member 619 is supported by the insertion portion 306 of the first flange 305, and a rear end 617 of the contact-separation member 619 is supported by the insertion portion 311 of the second flange 309. The length of the contact-separation member 619 is longer than the length of the axial direction K of the cylindrical portion 301. The contact and separation of the contact-separation member 619 with the outer surface 304 of the cylindrical portion 301 may be controlled by gravity and the rotation of the bobbin 600, as in the case of the bobbin 3. Alternatively, a metal material or a magnetic substance may be inserted into the string-like member, and similarly to the bobbin 403, the magnetic force may be controlled by turning on and off the magnetic force generator and rotating the bobbin 600.

[0063] In the above embodiment, the thread winding device 1 is an example of a thread winding device of the present invention. The nozzle rotation unit 2 is an example of a nozzle rotation unit of the present invention. The bobbins 3, 403, 500, and 600 are examples of bobbins of the present invention. The bobbin cases 4 and 404 are examples of bobbin cases of the present invention. The air supply unit 5 is an example of an air supply unit of the present invention. The bobbin rotation unit 7 is an example of a bobbin rotation unit of the present invention. The control device 9 is an example of a control device of the present invention. The nozzles 21 and 471 are an example of a nozzle of the present invention. The hollow portions 22 and 472 are an example of a hollow portion of the present invention. The tip 23 is an example of a tip of the present invention. The outer surface 25 is an example of an outer surface of the present invention. The opening 26 is an example of an opening of the present invention. The thread cutting unit 27 is an example of a thread cutting unit of the present invention. The blade portions 28 and 478 are an example of a blade portion of the present invention. The openings 45, 46, and 445 are examples of openings of the present invention. The shaft 73 is an example of a shaft of the present invention. The thread E is an example of a thread of the present invention. The first axis J1 is an example of a first axis of the present invention. The second axis J2 is an example of a second axis of the present invention. The winding direction M is an example of a winding direction of the present invention. The opposing positions P1 and Q are examples of opposing positions of the present invention. The separated position P2 is an example of a separated position of the present invention. The excess position P3 is an example of an excess position of the present invention. The first rotation direction R1 is an example of a first rotation direction of the present invention. The second rotation direction R2 is an example of a second rotation direction of the present invention. The thread supply source T is an example of a thread supply source of the present invention.

[0064] The yarn winding device 1 of the above embodiment includes a bobbin rotation unit 7 and a yarn cutting unit 27. The bobbin rotation unit 7 rotates the bobbin 3 in the bobbin case 4 in the winding direction M about the first axis J1, and winds the yarn E supplied from the yarn supply source T onto the bobbin 3. The yarn cutting unit 27 cuts the yarn E between the bobbin 3 and the yarn supply source T. The yarn winding device 1 includes a nozzle 21, a nozzle rotation unit 2, an air supply unit 5, and a control device 9. The nozzle 21 has an opening 26 formed on an outer surface 25 for passing the yarn E, has a hollow portion 22 through which the yarn E passed through the opening 26 is inserted, and is held rotatably about the second axis J2. The nozzle rotation unit 2 rotates the nozzle 21 around the second axis J2 between a facing position P1 where the tip 23 of the nozzle 21 faces the bobbin rotation unit 7 and a separated position P2 where the tip 23 of the nozzle 21 is further away from the bobbin rotation unit 7 than when the tip 23 of the nozzle 21 is at the facing position P1. The air supply unit 5 supplies air to the nozzle 21. The control device 9 controls the bobbin rotation unit 7, the nozzle rotation unit 2, and the air supply unit 5. The control device 9 supplies air to the nozzle 21 to pass the yarn E inserted through the hollow portion 22 located at the facing position P1 through the opening 45 of the bobbin case 4 (S14). The control device 9 drives the bobbin rotation unit 7 to wind the yarn E around the bobbin 3 (S15). After the yarn E has been wound around the bobbin 3, the control device 9 drives the nozzle rotation unit 2 to rotate the nozzle 21 in a first rotational direction R1 around the second axis J2 (S24). The control device 9 drives the yarn cutting unit 27 to cut the yarn E while the yarn E is wound around the outer periphery of the hollow portion 22 (S28). When cutting the yarn E, the control device 9 of the yarn winding device 1 contributes to preventing the yarn E from being cut in a bent, unstable state due to new yarn E being supplied from the yarn supply source T.

[0065] After cutting the yarn E (S28), when winding the yarn E onto the next bobbin 3, the control device 9 drives the nozzle rotation unit 2 to rotate the nozzle 21 a predetermined amount in a second rotation direction R2 about the second axis J2, which is opposite to the first rotation direction R1 (S13). The control device 9 slackens the yarn E wound around the outer periphery of the hollow portion 22, and then supplies air to the nozzle 21 to pass the yarn E through the opening 45 of the bobbin case 4 (S14). When winding the yarn E onto the next bobbin 3 after cutting the yarn E, the control device 9 of the yarn winding device 1 prevents the yarn E wound around the hollow portion 22 from preventing the yarn E from being supplied from the nozzle 21, thereby contributing to the slackened yarn E being sprayed from the nozzle 21. The control device 9 of the yarn winding device 1 can adjust the length of the yarn E when passing the yarn E from the nozzle 21 through the opening 45 of the bobbin case 4, by adjusting the amount of yarn E wound around the outer periphery of the hollow portion 22.

[0066] The predetermined amount is an amount that causes the length of the yarn E to be wound around the hollow portion 22 to be longer than the distance from the tip 23 of the nozzle 21 at the opposing position P1 to the outer periphery of the shaft 73 of the bobbin rotation unit 7 plus the length of one circumference of the shaft 73. The control device 9 of the yarn winding device 1 contributes to setting the length of the yarn E when passing the yarn E from the nozzle 21 through the openings 45, 46 of the bobbin case 4 to an appropriate length that will prevent the end of the yarn E from coming off the bobbin 3, depending on the distance from the tip 23 of the nozzle 21 at the opposing position P1 to the outer periphery of the shaft 73 of the bobbin rotation unit 7 and the outer periphery of the shaft 73.

[0067] An anti-slip material is provided on the outer surface 25 of the hollow portion 22. The hollow portion 22 of the yarn winding device 1 makes it less likely for the yarn E wound around the hollow portion 22 to slip than when the outer surface 25 does not have an anti-slip material, and this contributes to preventing the yarn E from being cut in an unstable, bent state when new yarn E is supplied from the yarn supply source T when the yarn E is cut.

[0068] The yarn cutting unit 27 is a blade unit 28 that is capable of cutting the yarn E formed at the tip 23 of the nozzle 21. When cutting the yarn E, the control device 9 drives the nozzle rotation unit 2 to rotate the nozzle 21 from the facing position P1 to the separated position P2 (S24, S25, S27). After the nozzle 21 reaches the separated position P2, the control device 9 cuts the yarn E with the blade unit 28. The blade unit 28 of the yarn winding device 1 contributes to simplifying the configuration of the yarn winding device 1 compared to when a yarn cutting unit is provided separately from the nozzle 21.

[0069] The control device 9 rotates the nozzle 21 in the first rotation direction R1 about the second axis to an excess position P3 beyond the distant position P2 (S24, S25), and then rotates the nozzle rotation unit 2 in the direction opposite to the first rotation direction R1 to position the nozzle 21 at the distant position P2 (S27). After the nozzle 21 reaches the distant position P2, the control device 9 cuts the yarn E with the blade portion 28 (S28). By rotating the nozzle 21 in the first rotation direction R1 about the second axis J2 until it passes the distant position P2, and then positioning it at the distant position P2, the control device 9 of the yarn winding device 1 generates slack in the yarn E, which contributes to making it easier for the yarn E to be guided to the blade portion 28 formed on the tip 23 of the nozzle 21.

[0070] The thread winding device of the present invention is not limited to the above-described embodiment and can be modified in various ways. The configuration of the thread winding device 1 may be modified as appropriate. The thread winding device 1 does not need to be configured with the thread supply system 12, and the operation of attaching and detaching the bobbin 3 to and from the thread winding device 1 may be performed by an operator. The control device 9 of the thread winding device 1 may be a general-purpose computer device and does not need to control at least one of the sewing machine 100 and the bobbin exchange device 200. The arrangement of components of the thread winding device 1, such as the nozzle rotation unit 2, bobbin rotation unit 7, and bobbin case rotation unit 6, may be modified as appropriate. The thread winding device 1 may not need to include at least one of the discharge device 8 and the bobbin case rotation unit 6. The types of the motors 41, 62, and 72 may be modified as appropriate.

[0071] The configuration of the nozzle 21 may be modified as appropriate. The outer surface 25 of the nozzle 21 does not need to be provided with a non-slip surface. The outer surface 25 may be any surface on which the opening 26 is formed. The opening 26 may be formed near the end of the nozzle 21 opposite the tip 23. The thread cutting portion 27 may be provided separately from the nozzle 21. The shape of the blade portion 29 may be modified as appropriate, for example, it may be a notch of any shape, such as a U-shape, a W-shape, or an I-shape, or it may be a convex shape. The position of the blade portion 29 may be modified as appropriate, for example, the blade portion 29 may be formed on the side of the first axis J1 with respect to an imaginary plane that passes through the center of the hollow portion 22 at the opposing position P1 and is parallel to the first axis J1. The nozzle 21 may be bent so that the tip portion 24 of the hollow portion 22 on which the blade portion 28 is formed faces in a direction that is less than 65 degrees or greater than 85 degrees with respect to the direction of extension of the second axis J2. The thread cutting unit 27 may be provided separately from the nozzle 21.

[0072] The configuration of the nozzle rotation unit 2 may be modified as appropriate. The power of the motor 72 may be transmitted to the nozzle 21 by a configuration other than the gears 39 and 40, such as an endless belt or a rack and pinion mounted on the nozzle 21. In S28, the control device 9 may drive the yarn cutting unit 27 to cut the yarn E while the yarn E is wound around the outer periphery of the hollow portion 22. The position of the nozzle 21 when S28 is executed may be modified as appropriate. The facing position P1, the distant position P2, and the excess position P3 may each be modified as appropriate. The distant position P2 may be a position rotated less than 135 degrees around the second axis J2 from the facing position P1. The control device 9 may position the nozzle 21 at the distant position P2 without rotating the nozzle 21 in the first rotation direction R1 around the second axis to the excess position P3.

[0073] The first rotation direction R1, the second rotation direction R2, the jetting direction F, and the winding direction M may be changed as appropriate. The winding direction M may be the same as the jetting direction F. The predetermined amount may be the length of the yarn E wound around the hollow portion 22 that is equal to or less than the distance from the tip 23 of the nozzle 21 at the opposing position P1 to the outer periphery of the shaft 73 of the bobbin rotation portion 7 plus the length of one circumference of the shaft 73. The extension direction of the second axis J2 relative to the extension direction of the first axis J1 may be changed as appropriate, and the extension direction of the first axis J1 may intersect with or be parallel to the extension direction of the second axis J2. [Explanation of symbols]

[0074] 1: yarn winding device, 2: nozzle rotating part, 3, 403, 500, 600: bobbin, 4, 404: bobbin case, 5: air supply part, 7: bobbin rotating part, 9: control device, 21, 471: nozzle, 22, 472: hollow part, 23: tip, 25: outer surface, 26: opening, 27: yarn cutting part, 28, 478: blade part, 45, 46, 445: opening, 73: shaft, E: yarn, J1: first shaft, J2: second shaft, M: winding direction, P1, Q: facing position, P2: separated position, P3: excess position, R1: first rotation direction, R2: second rotation direction, T: yarn supply source

Claims

1. a bobbin rotating section that rotates the bobbin in the bobbin case in a winding direction around a first axis to wind the thread supplied from the thread supply source onto the bobbin; a thread cutting unit that cuts the thread between the bobbin and the thread supply source; In a yarn winding device comprising: a nozzle having an opening formed on an outer surface thereof for passing the thread, a hollow portion through which the thread passed through the opening is inserted, and the nozzle being held rotatable around a second axis; a nozzle rotating unit that rotates the nozzle around the second axis between a facing position where a tip of the nozzle faces the bobbin rotation unit and a separated position where the tip of the nozzle is further away from the bobbin rotation unit than when the tip of the nozzle is at the facing position; an air supply unit that supplies air to the nozzle; a control device that controls the bobbin rotation unit, the nozzle rotation unit, and the air supply unit; Equipped with The control device Air is supplied to the nozzle to pass the yarn inserted in the hollow portion disposed at the opposing position through an opening of the bobbin case; Driving the bobbin rotating unit to wind the thread onto the bobbin; After the thread is wound around the bobbin, the nozzle rotation unit is driven to rotate the nozzle in a first rotation direction around the second axis, and in a state in which the thread is wound around the outer periphery of the hollow portion, the thread cutting unit is driven to cut the thread. A yarn winding device characterized by:

2. The control device 2. The yarn winding device according to claim 1, wherein, when winding the yarn onto a next bobbin after cutting the yarn, the nozzle rotation unit is driven to rotate the nozzle a predetermined amount in a second rotation direction around the second axis opposite to the first rotation direction, slackening the yarn wound around the outer periphery of the hollow portion, and then supplying air to the nozzle to pass the yarn through the opening of the bobbin case.

3. The yarn winding device according to claim 2, characterized in that the predetermined amount is an amount such that the length of the yarn to be wound around the hollow portion is longer than the distance from the tip of the nozzle located at the opposing position to the outer periphery of the shaft of the bobbin rotating portion plus the length of one circumference of the shaft.

4. The yarn winding device according to claim 1, wherein an anti-slip surface is provided on the outer surface of the hollow portion.

5. the thread cutting portion is a blade portion formed at the tip of the nozzle and capable of cutting the thread, The control device When cutting the yarn, the nozzle rotation unit is driven to rotate the nozzle from the facing position to the separated position, 5. The yarn winding device according to claim 1, wherein the yarn is cut by the blade after the nozzle is moved to the separated position.

6. The control device the nozzle rotation unit rotates the nozzle in the first rotation direction around the second axis to an excess position beyond the separated position, and then rotates the nozzle in a direction opposite to the first rotation direction to position the nozzle at the separated position; The yarn winding device according to claim 5, wherein the yarn is cut by the blade portion after the nozzle is in the separated position.

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