Description:TECHNICAL FIELD
[0001] The present disclosure relates to a yarn winding apparatus.

BACKGROUND ART
[0002] A yarn winding apparatus is known, which winds yarn unwound from a yarn feeding bobbin, so as to form a package. This type of yarn winding apparatus is equipped with a yarn splicing device, which splices a lower yarn on a yarn feeding bobbin side and an upper yarn on a package side, if yarn breakage occurs between the yarn feeding bobbin and the package. In addition, it is equipped with a yarn trap, which can suck and remove a foreign object such as lint or cotton fly adhered to yarn, if yarn breakage or yarn disconnection has occurred during a yarn winding operation.
[0003] In a yarn winding apparatus of JP2010-042904A, an upper yarn guide pipe and a lower yarn guide pipe disposed respectively above and below the yarn splicing device (splicer device) suck and catch the upper yarn and the lower yarn, respectively, and guide the same to the yarn splicing device. After that, the yarn splicing device splices the upper yarn and the lower yarn. The yarn trap creates a suction force at its opening end during the yarn winding operation, and thus can suck and remove a foreign object such as lint or cotton fly adhered to the traveling yarn.

SUMMARY OF INVENTION
TECHNICAL PROBLEM
[0004] The yarn trap is a tube-like member whose opening end is disposed adjacent to a yarn travel path, and the other end thereof is connected to a suction device, so that a suction force is created at the opening end. Therefore, if the suction force is always created at the opening end of the yarn trap during the yarn winding operation, the suction device consumes power.
[0005] It is an object of the present invention to reduce power consumption in the suction device in the yarn winding apparatus.

TECHNICAL SOLUTION
[0006] Hereinafter, a plurality of embodiments are described as means for solving the problem. These embodiments can be arbitrarily combined as necessary.
[0007] A yarn winding apparatus of a first aspect of the present disclosure includes a yarn feeding unit, a winding unit, a yarn splicing device, a suction unit, and a control section. The yarn feeding unit feeds yarn. The winding unit winds the yarn fed from the yarn feeding unit so as to form a package. The yarn splicing device performs yarn splicing of yarn on the yarn feeding unit side and yarn on the package side. The suction unit is disposed between the yarn splicing device and the winding unit, so as to suck the yarn. The control section performs control so that a yarn splicing operation, a winding start operation, and a suction start operation are performed in order, and that the suction start operation is performed after a predetermined first time has elapsed after the winding start operation. The yarn splicing operation is an operation in which the yarn splicing device performs yarn splicing. The winding start operation is an operation in which the winding unit starts winding the yarn on the package. The suction start operation is an operation for switching the suction unit from a stopped state to a sucking state.
[0008] This yarn winding apparatus allows the suction unit to be in the stopped state for the predetermined first time after the winding start operation. In this way, operating time of the suction device can be reduced, so as to reduce power consumption in the suction device.
[0009] The control section may control the suction unit to be in the stopped state before the yarn splicing operation is performed.
[0010] This yarn winding apparatus reduces power consumption in the suction device.
[0011] The control section may control the suction unit to be in the stopped state when forming the package after a predetermined second time has elapsed after the suction start operation.
[0012] This yarn winding apparatus reduces power consumption in the suction device.
[0013] The yarn winding apparatus may further include a detection unit and a cutting unit. The detection unit detects a state of the traveling yarn. Note that the states of the yarn include presence or absence of a yarn defect, and whether or not the yarn is traveling. The cutting unit cuts the yarn. The suction unit is disposed on a downstream side of the cutting unit in a traveling direction of the yarn when winding the yarn. The control section may perform control so that the yarn is cut by the cutting unit, and that the suction unit becomes the sucking state, on the basis of a detection result by the detection unit.
[0014] This yarn winding apparatus allows the suction unit to be in the sucking state, in synchronization with timing of cutting yarn that tends to cause a foreign object such as lint or cotton fly. In this way, mixing of a foreign object into the package is suppressed.
[0015] The yarn winding apparatus may further include an injection unit that injects air to a space in which the yarn in the detection unit travels. The control section may perform control so that the yarn is cut by the cutting unit and that the suction unit becomes the sucking state. After that, the control section may perform control so that the suction unit becomes the stopped state. After that, the control section may perform control so that air is injected by the injection unit.
[0016] This yarn winding apparatus allows the suction unit to be in the sucking state when cutting the yarn, and then switches the same to the stopped state, and then allows the injection unit to inject air. The suction is stopped when the air is injected, and hence a foreign object such as lint or cotton fly in the detection unit can be easily scattered.
[0017] The yarn winding apparatus may further include an injection unit that injects air to a space in which the yarn in the detection unit travels. The control section may perform control so that the yarn is cut by the cutting unit and that the suction unit becomes the sucking state. After that, the control section may perform control so that air is injected by the injection unit.
[0018] In this yarn winding apparatus, a foreign object such as lint or cotton fly scattered by air injected by the injection unit is sucked by the suction unit, and hence mixing of a foreign object into the package can be suppressed.
[0019] A yarn winding apparatus of a second aspect of the present disclosure includes a yarn feeding unit, a winding unit, a yarn splicing device, a suction unit, a control section, a detection unit, and a cutting unit. The yarn feeding unit feeds yarn. The winding unit winds the yarn fed from the yarn feeding unit so as to form a package. The yarn splicing device splices yarn on the yarn feeding unit side and yarn on the package side. The suction unit is disposed between the yarn splicing device and the winding unit, so as to suck the yarn. The detection unit detects a state of the traveling yarn. Note that the states of the yarn include presence or absence of a yarn defect, and whether or not the yarn is traveling. The cutting unit cuts the yarn. The suction unit is disposed on a downstream side of the cutting unit in a traveling direction of the yarn when winding the yarn. The control section performs control so that the suction unit becomes the stopped state when forming the package. On the basis of a detection result by the detection unit, the control section performs control so that the yarn is cut by the cutting unit and that the suction unit becomes the sucking state.
[0020] This yarn winding apparatus allows the suction unit to be in the stopped state when forming the package. In this way, power consumption in the suction device is reduced. In addition, this yarn winding apparatus allows the suction unit to be in the sucking state, in synchronization with timing of cutting yarn that tends to cause a foreign object such as lint or cotton fly. In this way, mixing of a foreign object into the package is suppressed.

ADVANTAGEOUS EFFECTS
[0021] In the yarn winding apparatus according to the present invention, power consumption in the suction device is reduced.

BRIEF DESCRIPTION OF DRAWINGS
[0022] Fig. 1 is a diagram illustrating a structure of an automatic winder.
Fig. 2 is a diagram illustrating a structure of a yarn winding apparatus.
Fig. 3 is a flowchart illustrating a flow of processing when detecting yarn breakage.
Fig. 4 is a timing chart when detecting yarn breakage.
Fig. 5 is a flowchart illustrating a flow of yarn defect processing.
Fig. 6 is a timing chart when detecting a yarn defect.
Fig. 7 is a flowchart illustrating a flow of yarn travel stop processing.
Fig. 8 is a timing chart when detecting yarn travel stop.

DESCRIPTION OF EMBODIMENTS
[0023] 1. First Embodiment
(1) Structure of Automatic Winder
Hereinafter, a first embodiment of the present invention is described in detail. First, a structure of an automatic winder 1 according to the first embodiment is described with reference to Fig. 1. Fig. 1 is a diagram illustrating a structure of the automatic winder 1.
[0024] The automatic winder 1 includes a plurality of yarn winding apparatuses 10 that are arranged side by side. Each yarn winding apparatus 10 unwinds yarn 14 from a yarn feeding bobbin 16, and forms a package 22 while traversing the yarn 14. A structure and operations of the yarn winding apparatus 10 will be described later in detail.
[0025] The automatic winder 1 includes a machine stand device 12. The machine control device 12 can communicate with each yarn winding apparatus 10. An operator of the automatic winder 1 appropriately operates the machine control device 12, and can integrally manage the plurality of yarn winding apparatuses 10. The machine stand device 12 is equipped with a display 12a, and an input interface 12b. The display 12a displays information related to set contents and/or states of the yarn winding apparatus 10, and the like. When the operator appropriately operates the input interface 12b, setting work for the yarn winding apparatus 10 can be performed.
[0026] The display 12a is a display device such as a liquid crystal display. The input interface 12b is an input device such as input keys or a touch panel. In addition, the display 12a and the touch panel as the input interface 12b may be one unit.
[0027] The automatic winder 1 includes a doffing device 13. When the package 22 becomes a full volume (a state where a defined amount of yarn is wound) in any one of the yarn winding apparatuses 10, the doffing device 13 moves to the yarn winding apparatus 10, so as to detach the full volume package and to set an empty winding bobbin.
[0028] (2) Structure of Yarn Winding Apparatus
Hereinafter, a structure of the yarn winding apparatus 10 according to the first embodiment is described with reference to Fig. 2. As illustrated in Fig. 2, the yarn winding apparatus 10 includes a main body of the yarn winding apparatus 10 having a yarn feeding unit 15 and a winding unit 17, and a unit control section (a control section) 50. The yarn winding apparatus 10 according to the first embodiment is the yarn winding apparatus 10 of a drum type, but the yarn winding apparatus 10 may be a winding apparatus of an arm traverse type or a winding apparatus of a belt traverse type. In addition, the yarn winding apparatus 10 according to the first embodiment is mounted in the automatic winder 1, but the yarn winding apparatus 10 may be mounted in an air spinning machine or an open-end spinning machine, for example.
[0029] The yarn winding apparatus 10 includes the yarn feeding unit 15 in the lower part. In other words, the yarn winding apparatus 10 includes the yarn feeding unit 15 disposed on an upstream side in a traveling direction of the yarn 14 when winding the yarn. The yarn feeding unit 15 feeds the winding unit 17 with the yarn 14 for forming the package 22. Specifically, the yarn feeding unit 15 is a conveyance tray type feeding mechanism, which supports the yarn feeding bobbin 16 placed on a conveyance tray (not shown) at a predetermined position, so as to feed the yarn feeding bobbin 16 to the predetermined position. The yarn feeding unit 15 is not limited to the conveyance tray type feeding mechanism, but may be a magazine type feeding mechanism, for example. Note that the position of the yarn feeding unit 15 is not limited to the lower part.
[0030] The winding unit 17 pulls out the yarn 14 from the yarn feeding bobbin 16 supported by the yarn feeding unit 15. The pulled out yarn 14 is wound to form the package 22 by the winding unit 17.
[0031] The yarn winding apparatus 10 includes the winding unit 17 in the upper part. In other words, the yarn winding apparatus 10 includes the winding unit 17 disposed on a downstream side in the traveling direction of the yarn 14 when winding the yarn. The winding unit 17 includes a cradle 18, and a winding drum 20 as main structural elements. Note that the position of the winding unit 17 is not limited to the upper part.
[0032] The cradle 18 has a pair of rotation support parts (not shown), which sandwich the package 22 at both ends in the length direction, so as to support the package 22 in a rotatable manner about a predetermined axis.
[0033] The winding drum 20 is a cylindrical member that is driven by a first motor 21 to rotate about the axis. The winding drum 20 is driven to rotate in the state where the outer periphery of the package 22 is contacted with the winding drum 20, and hence a drive force is applied to the package 22, which is driven to rotate along with the rotation of the winding drum 20.
[0034] In addition, a spiral traverse groove is formed on the side surface of a cylinder of the winding drum 20. During rotation of the winding drum 20, the package 22 is driven to rotate, and the yarn 14 unwound from the yarn feeding bobbin 16 is traversed by the traverse groove on the surface of the package 22 within a certain width. In this way, the yarn 14 unwound and fed from the yarn feeding bobbin 16 is wound on the surface of the package 22 while being traversed. As a result, the package 22 is formed, which has a certain winding width.
[0035] The yarn winding apparatus 10 includes a yarn unwinding assist device 25, a tension applying device 27, a yarn splicing device 38, a clearer (detection unit) 40, and a yarn trap (suction unit) 44, which are disposed in order from the yarn feeding unit 15 to the winding unit 17.
[0036] The yarn unwinding assist device 25 restricts warping (balloon) of the unwound yarn 14, so as to stabilize unwinding tension. The yarn unwinding assist device 25 has a movable cylindrical body 26. The yarn unwinding assist device 25 allows the movable cylindrical body 26 covering a core tube of the yarn feeding bobbin 16 to move downward in synchronization with unwinding of the yarn 14 from the yarn feeding bobbin 16, so as to assist unwinding of the yarn 14 from the yarn feeding bobbin 16. The movable cylindrical body 26 contacts the balloon formed above the yarn feeding bobbin 16 due to rotation of the yarn 14 unwound from the yarn feeding bobbin 16 and a centrifugal force, so as to apply an appropriate tension to the balloon, and thus assists unwinding of the yarn 14.
[0037] The tension applying device 27 applies a predetermined tension to the traveling yarn 14. As the tension applying device 27, for example, it is possible to use a gate type, in which a movable comb tooth member is disposed against a fixed comb tooth member. The movable comb tooth member is configured to be engaged or released from the fixed comb tooth member. By allowing the yarn 14 to travel meandering between the comb tooth members in the engaged state, the yarn 14 to be wound is applied with a certain tension so that quality of the package 22 can be improved. Note that the tension applying device 27 is not limited to the gate type described above, but may be a disc type, for example.
[0038] The yarn splicing device 38 splices upper yarn on the side of the package 22 and lower yarn on the side of the yarn feeding bobbin 16, when the clearer 40 has detected a yarn defect and cuts the yarn, or when a yarn breakage has occurred during unwinding from the yarn feeding bobbin 16. In the following description, the operation of the yarn splicing device 38 to splice the upper yarn and the lower yarn is referred to as a yarn splicing operation. The yarn splicing device 38 is a splicer device that twists the yarn ends together using swirling air flow generated by compressed air, for example.
[0039] The yarn winding apparatus 10 includes an upper yarn catching unit 30 disposed on the downstream side of the yarn splicing device 38 in the traveling direction of the yarn 14 when winding the yarn. The upper yarn catching unit 30 is a device that sucks and catches yarn end of the yarn 14 on the side of the package 22 (the upper yarn) when the yarn 14 becomes disconnected. The upper yarn catching unit 30 includes a shaft part 31, a pipe part 32, and a sucking and catching unit 33. The pipe part 32 and the sucking and catching unit 33 are capable of turning (moving) about the shaft part 31, from a standby position on the side of the yarn feeding unit 15 (illustrated by a solid line in Fig. 2) to a catching position on the side of the winding unit 17 (illustrated by a broken line in Fig. 2). Note that in the following description, the yarn end of the upper yarn may be referred to as an upper yarn end.
[0040] In addition, in the upper yarn catching unit 30, the shaft part 31 of the pipe part 32 is connected to the suction device 19, and a suction air flow by suction force can be created at the sucking and catching unit 33 (specifically, at a suction inlet of its distal end). In this embodiment, as the suction device 19, there are disposed a duct 191 extending in the direction where the yarn winding apparatuses 10 are arranged, on the back side of each yarn winding apparatus 10, and a suction source 193 connected to one end of the duct 191, so as to create a predetermined negative pressure in the duct 191. The shaft part 31 is connected to the suction source 193 via the duct 191. The suction source 193 is a blower device, for example. The sucking and catching unit 33 is formed in an elongated shape so as to cover the winding width of the package 22. In this way, the suction air flow can act over the entire winding width of the outer periphery surface of the package 22.
[0041] With the structure described above, the upper yarn catching unit 30 in the catching position can suck and catch the yarn end on the side of the package 22 into the pipe part 32, using the suction air flow created at the sucking and catching unit 33. In addition, when returning to the standby position, it can guide the caught yarn 14 to the yarn splicing device 38.
[0042] The yarn winding apparatus 10 includes a yarn detection sensor 45. The yarn detection sensor 45 is disposed in a vicinity of the winding unit 17. The yarn detection sensor 45 detects whether or not the upper yarn catching unit 30 has caught the upper yarn. The yarn detection sensor 45 outputs a yarn detection signal to the unit control section 50 when detecting that the upper yarn catching unit 30 has caught the upper yarn.
[0043] The yarn winding apparatus 10 includes a lower yarn catching unit 34 disposed on an upstream side of the yarn splicing device 38 in the traveling direction of the yarn 14 when winding the yarn. Similarly to the upper yarn catching unit 30 described above, the lower yarn catching unit 34 includes a shaft part 35, a pipe part 36, and a sucking and catching unit 37. Similarly to the sucking and catching unit 33 of the upper yarn catching unit 30, the sucking and catching unit 37 is capable of turning about the shaft part 35, and can create a suction air flow by suction power. With this structure, the lower yarn catching unit 34 can catch a yarn end of the yarn 14 on the side of the yarn feeding unit 15 (the lower yarn) by the suction air flow, and can guide the caught yarn 14 to the yarn splicing device 38. Note that in the following description, the yarn end of the lower yarn may be referred to as a lower yarn end.
[0044] Note that similarly to the upper yarn catching unit 30, the lower yarn catching unit 34 may have a shutter at a connection part between the pipe part 36 and the duct 191, for example, so as to control whether or not to create the suction air flow described above.
[0045] The clearer 40 monitors a state of the yarn 14 traveling in the yarn travel path between the yarn feeding unit 15 and the winding unit 17 with a sensor, and detects presence or absence of a yarn defect on the basis of the monitored information. The clearer 40 detects, for example, thickness abnormality of the yarn 14 and/or foreign object included in the yarn 14, as a yarn defect.
[0046] Specifically, the clearer 40 includes a clearer head 41 having an optical sensor (not shown) for detecting thickness of the yarn 14, and an analyzer 43 for processing a yarn thickness signal from the optical sensor. Note that the sensor is not limited to an optical sensor but may be a capacitance sensor. The analyzer 43 is electrically connected to the unit control section 50. The clearer head 41 has a slit through which the yarn 14 passes, which is disposed in the yarn travel path for the yarn 14, and monitors the yarn 14 passing through the slit with a not-shown optical sensor. For instance, if it is detected that the amount of light detected by the optical sensor is more excessive than the predetermined range (the yarn 14 is too thin, or a yarn breakage has occurred), or is too little (the yarn 14 is too thick), the analyzer 43 outputs a yarn defect detection signal to the unit control section 50. In addition, in a vicinity of the clearer head 41, a cutter (cutting unit) 42 is disposed so as to promptly cut the yarn 14 if the analyzer 43 detects a yarn defect.
[0047] In addition, the clearer 40 detects yarn breakage, i.e., presence or absence of the yarn 14 in the yarn travel path. Specifically, if the analyzer 43 detects that amount of light detected by the optical sensor is normal within a predetermined range, it outputs a yarn presence signal to the unit control section 50.
[0048] In addition, the clearer 40 monitors a state of the yarn 14 with the sensor, so as to detect whether the yarn 14 is traveling. Specifically, the analyzer 43 detects whether or not the thickness of the yarn 14 is changing on the basis of change in amount of light detected by the optical sensor. When the analyzer 43 detects that the thickness of the yarn 14 is not changing, it outputs a yarn stop signal to the unit control section 50.
[0049] In a vicinity of the clearer 40, there are disposed the cutter 42 for cutting the yarn 14 and an injection unit 111 that injects air to the traveling yarn 14. Note that the cutter 42 and the injection unit 111 may be provided to the clearer 40. When the unit control section 50 controls the analyzer 43, the cutter 42 works. When the analyzer 43 cuts the yarn 14, it outputs a cut signal to the unit control section 50. The injection unit 111 has a nozzle for injecting compressed air, which is adjacent to the yarn travel path in the clearer 40, and the other end thereof is connected to an air supply device 114 via an air flow path 112 and a valve 113. The valve 113 is electrically connected to the unit control section 50, so as to open and close the air flow path 112 on the basis of a control signal. The injection unit 111 injects compressed air through the nozzle, so as to scatter lint in the yarn travel path in the clearer 40.
[0050] The yarn trap 44 is disposed on the downstream side of the cutter 42 in the traveling direction of the yarn 14 when winding the yarn. The yarn trap 44 is a tube-like member, whose distal end adjacent to the yarn travel path is provided with a suction inlet. In addition, a proximal end of the yarn trap 44 is connected to the suction source 193 via the duct 191. Thus, a suction inlet of the yarn trap 44 can create the suction air flow by the suction force. The yarn trap 44 allows the suction air flow to act on the yarn 14 traveling in the yarn travel path, so as to suck and remove a foreign object such as lint or cotton fly adhered to the yarn 14, or cotton fly floating in the air.
[0051] The yarn winding apparatus 10 includes a shutter 194 at a connection part between the duct 191 and the pipe part 32 as well as the yarn trap 44. The shutter 194 switches between the opened state of a flow path 192a connecting the pipe part 32 and the duct 191, and the opened state of a flow path 192b connecting the yarn trap 44 and the duct 191. In addition, the shutter 194 can also allow both the flow path 192a and the flow path 192b to be in the closed state.
[0052] Specifically, if the shutter 194 allows the flow path 192a to be in the closed state, the sucking and catching unit 33 does not create the suction air flow. In contrast, if the flow path 192a is allowed to be in the opened state, the sucking and catching unit 33 creates the suction air flow. In addition, if the shutter 194 allows the flow path 192b to be in the closed state, the suction inlet of the yarn trap 44 does not create the suction air flow. In contrast, if the flow path 192b is allowed to be in the opened state, the suction inlet of the yarn trap 44 creates the suction air flow.
[0053] The shutter 194 is electrically connected to the unit control section 50. The unit control section 50 controls the shutter 194 to switch between the opened and closed states of the flow path 192a and the flow path 192b, and hence switches the sucking and catching unit 33 and the suction inlet of the yarn trap 44 between a stopped state and a sucking state. The stopped state means a state where the suction air flow is not created, while the sucking state means a state where the suction air flow is created.
[0054] In the following description, the operation of the shutter 194 to switch the flow path 192b from the closed state to the opened state is referred to as a suction start operation. In other words, the suction start operation means to switch the suction inlet of the yarn trap 44 from the stopped state to the sucking state. In addition, the operation of the shutter 194 to switch the flow path 192b from the opened state to the closed state is referred to as a suction stop operation. In other words, the suction stop operation means to switch the suction inlet of the yarn trap 44 from the sucking state to the stopped state.
[0055] (3) Flow of Package Forming Process When Detecting Yarn Breakage
Next, with reference to Figs. 2 and 3, an operation of the yarn winding apparatus 10 in the winding step is described. Fig. 3 is a flowchart illustrating a flow of processing that is performed when yarn breakage has occurred in the yarn winding apparatus 10. Note that the flowchart illustrated in Fig. 3, 5, or 7 is merely an example, which may be appropriately modified unless any contradiction occurs. For instance, before or after each step, not shown another step may be included, or the order of the steps may be arbitrarily changed as long as no contradiction occurs. Note that in the following description, a rotation of the package 22 in the winding direction of the yarn 14 is referred to as a forward rotation, and a rotation of the same in an unwinding direction is referred to as a backward rotation.
[0056] When performing the winding step for winding the yarn 14 on the package 22, the clearer 40 detects yarn breakage, i.e., presence or absence of the yarn 14 in the yarn travel path. In this embodiment, the yarn breakage includes cutting of the yarn 14 when a yarn defect is detected, and disconnection of the yarn 14 when yarn travel stop occurs. If the analyzer 43 detects that amount of light detected by the optical sensor is normal within a predetermined range, it outputs the yarn presence signal to the unit control section 50. In this embodiment, in the winding step, the suction inlet of the yarn trap 44 is in the sucking state.
[0057] The unit control section 50 determines whether or not yarn breakage of the yarn 14 has occurred, on the basis of whether or not the yarn presence signal indicating that there is the yarn 14 is input from the clearer 40 (Step S101).
[0058] If it is determined that a yarn breakage has not occurred (Yes in Step S101), the unit control section 50 allows the package 22 to rotate forward at a predetermined winding speed, i.e. at a rotation speed of the package 22 when the yarn 14 is wound (Step S112). In this way, the yarn 14 is wound so that the package 22 is formed.
[0059] In contrast, if it is determined that a yarn breakage has occurred (No in Step S101), the unit control section 50 controls the first motor 21 to stop rotation of the package 22. In addition, the unit control section 50 allows the shutter 194 to perform the suction stop operation (Step S102). As a result, the suction inlet of the yarn trap 44 is switched from the sucking state to the stopped state. When winding of the yarn 14 on the package 22 is stopped, or when the yarn splicing device 38 is performing the yarn splicing operation, there is little possibility that lint or the like is mixed into the package 22, and hence, the stopped state of the suction inlet of the yarn trap 44 affects little on quality of the package 22. Thus, by allowing the suction inlet of the yarn trap 44 to be in the stopped state, power consumption in the suction device 19 can be reduced.
[0060] The unit control section 50 starts the upper yarn end catching operation with the upper yarn catching unit 30, and the lower yarn end catching operation with the lower yarn catching unit 34 (Step S103). Specifically, the unit control section 50 starts the control of turning the pipe part 32 of the upper yarn catching unit 30 upward. As a result, the sucking and catching unit 33 reaches the upper yarn catching position illustrated by the broken line in Fig. 2. When the sucking and catching unit 33 reaches the upper yarn catching position, the unit control section 50 controls the shutter 194 to allow the flow path 192a to be in the opened state. As a result, the sucking and catching unit 33 becomes the sucking state.
[0061] When the sucking and catching unit 33 reaches the upper yarn catching position, the unit control section 50 further sends a signal to the first motor 21, so as to allow the package 22 to rotate backward. In the state where the pipe part 32 is moved to the upper yarn catching position in the upper part, the unit control section 50 allows the package 22 to rotate backward by a predetermined rotation amount. In this way, the sucking and catching unit 33 can allow the suction air flow to act on the surface of the package 22, at a position substantially facing the surface of the package 22 with a predetermined interval therebetween. When the package 22 rotates backward in the state where the suction air flow acts on the surface of the package 22 by the sucking and catching unit 33, unwinding of the upper yarn from the package 22 and sucking of the upper yarn end by the sucking and catching unit 33 are promoted. The upper yarn end existing on the surface of the package 22 is sucked into the pipe part 32 by the action of the suction air flow, when it passes a part facing the sucking and catching unit 33.
[0062] When the unit control section 50 determines that the upper yarn catching unit 30 has succeeded in catching the upper yarn end, on the basis of the yarn detection signal output from the yarn detection sensor 45, it continues the backward rotation of the package 22, and allows the pipe part 32 to turn downward, so as to move to the standby position illustrated by the solid line in Fig. 2. In this way, the upper yarn caught by the upper yarn catching unit 30 is guided to the yarn splicing device 38.
[0063] On the other hand, the lower yarn end of the disconnected yarn 14 is caught by the suction air flow created at the sucking and catching unit 37 of the lower yarn catching unit 34. After the lower yarn end is caught, the unit control section 50 allows the pipe part 36 to turn upward so as to move to the position illustrated by the broken line in Fig. 2. In this way, the lower yarn caught by the lower yarn catching unit 34 is guided to the yarn splicing device 38.
[0064] When the upper yarn is guided to the yarn splicing device 38, the unit control section 50 controls the shutter 194 so as to allow the flow path 192a to be in the closed state. As a result, the suction inlet of the sucking and catching unit 33 becomes the stopped state. In this case, the suction inlet of the yarn trap 44 is also in the stopped state.
[0065] After the upper yarn and the lower yarn are guided into the yarn splicing device 38, the unit control section 50 allows the yarn splicing device 38 to perform the yarn splicing operation (Step S104).
[0066] After the yarn splicing operation is performed by the yarn splicing device 38, the unit control section 50 sends a drive signal to the first motor 21, so as to start forward rotation of the package 22 (winding start operation). In this way, winding of the yarn 14 on the package 22 is started (Step S105).
[0067] After starting winding of the yarn 14, the unit control section 50 determines presence or absence of a yarn defect, on the basis of a yarn defect signal output from the analyzer 43 (Step S106).
[0068] If it is determined that there is a yarn defect (Yes in Step S106), the unit control section 50 performs yarn defect processing described later (Step S107). The yarn defect processing is constituted of Steps S201 to S205.
[0069] In contrast, if it is determined that there is no yarn defect (No in Step S106), the unit control section 50 determines whether or not the yarn 14 has stopped traveling, on the basis of the yarn stop signal output from the analyzer 43 (Step S108).
[0070] If it is determined that the yarn 14 has stopped traveling (Yes in Step S108), the unit control section 50 performs yarn travel stop processing described later (Step S109). The yarn travel stop processing is constituted of Steps S301 to S305.
[0071] In contrast, if it is determined that the yarn 14 has not stopped traveling (No in Step S108), the unit control section 50 determines whether or not a predetermined first time has elapsed from the winding start operation of Step S105 (Step S110). If the unit control section 50 determines that the predetermined first time has not elapsed from the winding start operation of Step S105 (No in Step S110), it repeats Steps S106 and S108 described above until the predetermined first time elapses.
[0072] If the unit control section 50 determines that the predetermined first time has elapsed after the winding start operation of Step S105 (Yes in Step S110), it allows the shutter 194 to perform the suction start operation (Step S111). In other words, after the predetermined first time has elapsed after the winding start operation, the unit control section 50 performs control so that the suction inlet of the yarn trap 44 becomes the sucking state. The predetermined first time is 0.5 seconds or more and 2 seconds or less. More preferably, it is 0.8 seconds or more and 1.2 seconds or less. Note that the predetermined first time is determined preferably on the basis of the time for a travel speed of the yarn 14 to become the predetermined winding speed. Note that whether or not the predetermined first time has elapsed is determined on the basis of the winding start operation of Step S105 that was last performed.
[0073] The unit control section 50 increases the rotation speed of the package 22 until the package 22 becomes the predetermined winding speed (the rotation speed of the package 22 when the yarn 14 is wound). In this way, the yarn 14 is wound so that the package 22 is formed (Step S112).
[0074] The unit control section 50 determines whether or not winding of the yarn 14 is finished (Step S113). If it is determined that winding of the yarn 14 is finished, the unit control section 50 finishes the process (Yes in Step S113). If it is determined that winding of the yarn 14 is not finished (No in Step S113), the unit control section 50 repeats Steps S101 to S112 described above until winding of the yarn 14 is finished. Note that, for example, the winding of the yarn 14 is finished also in the case where another abnormality that requires stopping the winding of the yarn 14 occurs in the yarn winding apparatus 10, or the case where an operator instructs to stop the yarn winding apparatus 10.
[0075] Next, with reference to a timing chart illustrated in Fig. 4, operations of individual units of the yarn winding apparatus 10, when a yarn breakage has occurred in the yarn winding apparatus 10, are described in detail. Fig. 4 illustrates an operation of the yarn winding apparatus 10, when it is determined in Step S106 that there is no yarn defect, and when it is determined in Step S108 that the yarn 14 has not stopped traveling.
[0076] Before time point t11, the winding step is being performed, and hence the package 22 is rotating forward, the yarn presence signal output from the analyzer 43 is ON, and the suction inlet of the yarn trap 44 is in the sucking state.
[0077] At time point t11, when the yarn presence signal output from the analyzer 43 becomes OFF, the unit control section 50 determines that a yarn breakage has occurred. In addition, the unit control section 50 allows the package 22 to stop, and allows the shutter 194 to perform the suction stop operation. As a result, the suction inlet of the yarn trap 44 becomes the stopped state.
[0078] After that, the unit control section 50 starts the upper yarn end catching operation by the upper yarn catching unit 30, and the lower yarn end catching operation by the lower yarn catching unit 34. At time point t12, when the sucking and catching unit 33 reaches the upper yarn catching position, the unit control section 50 sends a signal to the first motor 21, so as to allow the package 22 to rotate backward. In addition, the unit control section 50 controls the shutter 194 so as to allow the flow path 192a to be in the opened state. As a result, the sucking and catching unit 33 becomes the sucking state. In this case, the suction inlet of the yarn trap 44 is in the stopped state. The upper yarn end existing on the surface of the package 22 is sucked into the pipe part 32 by the action of the suction air flow, when it passes a part facing the sucking and catching unit 33.
[0079] After the upper yarn end and the lower yarn end are guided to the yarn splicing device 38, at time point t13, the unit control section 50 stops the package 22, and allows the yarn splicing device 38 to perform the yarn splicing operation. In addition, the unit control section 50 controls the shutter 194 so that the flow path 192a becomes the closed state. As a result, the suction inlet of the sucking and catching unit 33 becomes the stopped state. In this case, the suction inlet of the yarn trap 44 is also in the stopped state. When the upper yarn and the lower yarn are guided to the yarn splicing device 38, the yarn presence signal output from the analyzer 43 becomes ON.
[0080] After the yarn splicing device 38 finishes the yarn splicing, at time point t14, the unit control section 50 sends a drive signal to the first motor 21, so as to allow the package 22 to start forward rotation (the winding start operation). In this way, winding of the yarn 14 on the package 22 is started.
[0081] At time point t15 after the predetermined first time has elapsed after the winding start operation, the unit control section 50 allows the shutter 194 to perform the suction start operation. As a result, the suction inlet of the yarn trap 44 becomes the sucking state. The predetermined first time from t14 to t15 is 0.5 seconds or more and 2 seconds or less as described above. More preferably, it is 0.8 seconds or more and 1.2 seconds or less.
[0082] Here, for example, if the yarn splicing described above is performed in the state where remaining amount of the yarn 14 wound on the yarn feeding bobbin 16 is little, or if a yarn breakage occurs for some reason, the yarn end may pass a vicinity of the suction inlet of the yarn trap 44, before rotation speed of the package 22 reaches the predetermined winding speed after the winding start operation. Before rotation speed of the package 22 becomes the predetermined winding speed after the winding start operation, the travel speed of the yarn 14 is slow, and hence the yarn 14 may be sucked and caught by the suction inlet of the yarn trap 44 if the yarn trap 44 is in the sucking state. In this state, if the upper yarn catching unit 30 catches the yarn 14 on the side of the package 22, there is a possibility that the upper yarn catching unit 30 may catch the yarn 14 twice. As a result, there is a possibility that the yarn splicing may be failed, or that the yarn 14 is pulled out unnecessarily for the yarn splicing, which causes lint that may be mixed into the package 22.
[0083] In this embodiment, after the winding start operation, the suction inlet of the yarn trap 44 becomes the sucking state after the predetermined first time has elapsed, and hence failure in yarn splicing or mixing of a foreign object into the package 22 can be suppressed.
[0084] (4) Flow of Package Forming Process When Detecting Yarn Defect
Next, the yarn defect processing in Step S107 is described in detail. The yarn defect processing, which is performed if the unit control section 50 has determined presence of a yarn defect (Yes in Step S106), is constituted of Steps S201 to S205.
[0085] As described above, the yarn winding apparatus 10 of this embodiment allows the suction inlet of the yarn trap 44 to become the sucking state after the predetermined first time has elapsed after the winding start operation. In other words, during the predetermined first time after the winding start operation, the suction inlet of the yarn trap 44 is in the stopped state. Here, with reference to a flowchart illustrated in Fig. 5, a flow of the processing is described, which is performed if a yarn defect is detected during the stopped state of the suction inlet of the yarn trap 44.
[0086] Even in the case where the suction inlet of the yarn trap 44 is in the stopped state, when the winding step for winding the yarn 14 on the package 22 is performed, the clearer 40 monitors a state of the traveling yarn 14 with the optical sensor. On the basis of the amount of light detected by the optical sensor, the analyzer 43 detects presence or absence of a yarn defect. If the analyzer 43 detects a yarn defect, it outputs the yarn defect signal to the unit control section 50.
[0087] If it is determined that there is a yarn defect on the basis of the yarn defect signal output from the analyzer 43, the unit control section 50 allows the shutter 194 to perform the suction start operation (Step S201). As a result, the suction inlet of the yarn trap 44 is switched from the stopped state to the sucking state. After that, on the basis of the yarn defect signal, the unit control section 50 controls the analyzer 43, and activates the cutter 42 to cut the yarn 14 (Step S202). The analyzer 43 outputs the cut signal to the unit control section 50. In this way, the yarn winding apparatus 10 allows the yarn trap 44 to suck and remove a foreign object such as lint or cotton fly, which is generated when the cutter 42 cuts the yarn 14.
[0088] The unit control section 50 starts the upper yarn end catching operation by the upper yarn catching unit 30, and the lower yarn end catching operation by the lower yarn catching unit 34 (Step S203).
[0089] The unit control section 50 allows the sucking and catching unit 33 to move to the upper yarn catching position, and allows the shutter 194 to perform the suction stop operation (Step S204). As a result, the suction inlet of the yarn trap 44 is switched from the sucking state to the stopped state.
[0090] After that, the unit control section 50 sends a control signal to the valve 113 so as to open the air flow path 112, and allows the nozzle of the injection unit 111 to inject compressed air so as to scatter lint in the yarn travel path in the clearer 40 (Step S205).
[0091] After finishing the yarn defect processing, the process returns to Step S104, and the unit control section 50 allows the yarn splicing device 38 to perform the yarn splicing operation.
[0092] Next, with reference to a timing chart illustrated in Fig. 6, operations of individual units of the yarn winding apparatus 10 are described in detail, in the case where a yarn defect is detected when the yarn trap 44 is in the stopped state.
[0093] Before time point t21, the suction inlet of the yarn trap 44 is in the stopped state. If the analyzer 43 detects a yarn defect at time point t21, it outputs the yarn defect signal to the unit control section 50 (changes from OFF to ON). In addition, the unit control section 50 controls the analyzer 43 on the basis of the yarn defect signal, and activates the cutter 42 to cut the yarn 14. The analyzer 43 outputs the cut signal to the unit control section 50.
[0094] When the yarn 14 is cut, the yarn presence signal turns OFF at time point t22. The unit control section 50 allows the shutter 194 to perform the suction start operation. As a result, the suction inlet of the yarn trap 44 switches from the stopped state to the sucking state. In addition, the unit control section 50 sends a signal to the first motor 21, so as to stop the package 22.
[0095] After that, at time point t23, the unit control section 50 starts the upper yarn end catching operation by the upper yarn catching unit 30 and the lower yarn end catching operation by the lower yarn catching unit 34. The unit control section 50 allows the sucking and catching unit 33 to move to the upper yarn catching position, and allows the shutter 194 to perform the suction stop operation. As a result, the suction inlet of the yarn trap 44 is switched from the sucking state to the stopped state. In this way, power consumption in the suction device 19 can be reduced.
[0096] After the sucking and catching unit 33 reaches the upper yarn catching position, the unit control section 50 sends a signal to the first motor 21, so as to allow the package 22 to rotate backward. In addition, the unit control section 50 controls the shutter 194 to allow the flow path 192a to be in the opened state. As a result, the sucking and catching unit 33 becomes the sucking state. The upper yarn end existing on the surface of the package 22 is sucked into the pipe part 32 by the action of the suction air flow, when it passes a part facing the sucking and catching unit 33. Note that the suction stop operation and the control to allow the flow path 192a to be in the opened state may be performed simultaneously.
[0097] After the upper yarn catching unit 30 has succeeded in catching the upper yarn end, the yarn detection signal turns ON at time point t24. At time point t25, the unit control section 50 sends a control signal to the valve 113 so as to open the air flow path 112, and the compressed air is injected from the nozzle of the injection unit 111 so as to scatter lint.
[0098] After the upper yarn and the lower yarn are guided to the yarn splicing device 38, at time point t26, the unit control section 50 allows the package 22 to stop, and allows the yarn splicing device 38 to perform the yarn splicing operation. In addition, the unit control section 50 controls the shutter 194 to allow the flow path 192a to be in the closed state. As a result, the suction inlet of the sucking and catching unit 33 becomes the stopped state. In this case, the suction inlet of the yarn trap 44 is also in the stopped state. When the upper yarn is guided to the yarn splicing device 38, the yarn presence signal output from the analyzer 43 turns ON.
[0099] After the yarn splicing device 38 finishes the yarn splicing, at time point t27, the unit control section 50 sends a drive signal to the first motor 21, so as to start forward rotation of the package 22 (the winding start operation). In this way, winding of the yarn 14 on the package 22 is started.
[0100] A foreign object such as lint or cotton fly tends to occur at timing when the cutter 42 cuts the yarn 14. In this embodiment, even in the case where the suction inlet of the yarn trap 44 is in the stopped state, the yarn trap 44 is allowed to be in the sucking state in synchronization with timing when the cutter 42 cuts the yarn 14. In this way, mixing of a foreign object into the package 22 can be suppressed. In addition, air is injected by the injection unit 111 during the stopped state of the suction inlet of the yarn trap 44, and hence lint in the yarn travel path in the clearer 40 can be easily scattered.
[0101] (5) Flow of Package Forming Process When Detecting Yarn Travel Stop
Next, the yarn travel stop processing in Step S109 is described in detail. The yarn travel stop processing, which is performed if the unit control section 50 determines that the yarn 14 has stopped traveling (Yes in Step S108), is constituted of Steps S301 to S305. Here, with reference to a flowchart illustrated in Fig. 7, a flow of the processing is described, which is performed if travel stop of the yarn 14 is detected during the stopped state of the suction inlet of the yarn trap 44.
[0102] Even in the case where the suction inlet of the yarn trap 44 is in the stopped state, the clearer 40 monitors a state of the traveling yarn 14 with the optical sensor, so as to detect whether or not the yarn 14 is traveling. For instance, if a yarn breakage has occurred on the downstream side of the clearer 40 in the traveling direction of the yarn 14 when winding the yarn, the clearer 40 detects the lower yarn on the yarn feeding bobbin side, and outputs the yarn presence signal to the unit control section 50. In this case, because the lower yarn is not wound by the winding unit 17, the yarn 14 detected by the clearer 40 is stopped traveling. The analyzer 43 detects whether or not the thickness of the yarn 14 is changing on the basis of change in amount of light detected by the optical sensor. If the analyzer 43 detects that the thickness of the yarn 14 is not changing, it outputs the yarn stop signal to the unit control section 50.
[0103] If it is determined that the yarn 14 is stopped traveling, on the basis of the yarn stop signal output from the analyzer 43, the unit control section 50 allows the shutter 194 to perform the suction start operation (Step S301). As a result, the suction inlet of the yarn trap 44 is switched from the stopped state to the sucking state. After that, on the basis of the yarn stop signal, the unit control section 50 controls the analyzer 43, and activates the cutter 42 to cut the yarn 14 (Step S302). The analyzer 43 outputs the cut signal to the unit control section 50. In this way, the yarn winding apparatus 10 can suck and remove a foreign object such as lint or cotton fly generated due to cutting of the yarn 14 by the cutter 42, using the yarn trap 44.
[0104] Steps S303 to S305 are the same as Steps S203 to S205, and hence description thereof is omitted. After finishing the yarn travel stop processing, the process returns to Step S104, and the unit control section 50 allows the yarn splicing device 38 to perform the yarn splicing operation.
[0105] Next, with reference to a timing chart illustrated in Fig. 8, operations of individual units of the yarn winding apparatus 10 are described in detail, in the case where travel stop of the yarn 14 is detected when the yarn trap 44 is in the stopped state.
[0106] Before time point t31, the suction inlet of the yarn trap 44 is in the stopped state. At time point t31, the analyzer 43 detects travel stop of the yarn 14, and then outputs the yarn stop signal to the unit control section 50 (changes from OFF to ON). In addition, the unit control section 50 controls the analyzer 43 on the basis of the yarn stop signal, and activates the cutter 42 to cut the yarn 14. The analyzer 43 outputs the cut signal to the unit control section 50.
[0107] Operations from time point t32 to time point t37 are the same as those from time point t22 to time point t27 described above, and descriptions thereof are omitted.
[0108] A foreign object such as lint or cotton fly tends to occur at timing when the cutter 42 cuts the yarn 14. In this embodiment, even in the case where the suction inlet of the yarn trap 44 is in the stopped state, the yarn trap 44 is allowed to be in the sucking state in synchronization with timing when the cutter 42 cuts the yarn 14. In this way, mixing of a foreign object into the package 22 can be suppressed. In addition, air is injected by the injection unit 111 during the stopped state of the suction inlet of the yarn trap 44, and hence lint in the yarn travel path in the clearer 40 can be easily scattered.
[0109] 3. Features of Embodiment
The first embodiment described above has the following structure and functions.
[0110] The yarn winding apparatus 10 includes the yarn feeding unit 15, the winding unit 17, the yarn splicing device 38, the yarn trap 44, and the unit control section 50. The yarn feeding unit 15 feeds the yarn 14. The winding unit 17 winds the yarn 14 fed from the yarn feeding unit 15 so as to form the package 22. The yarn splicing device 38 performs yarn splicing of a yarn end on the side of the yarn feeding unit 15 and a yarn end on the side of the package 22. The yarn trap 44 is disposed between the yarn splicing device 38 and the winding unit 17, so as to suck the yarn 14.
[0111] The unit control section 50 performs control so that the yarn splicing operation, the winding start operation, and the suction start operation are performed in order, and that the suction start operation is performed after the predetermined first time has elapsed after the winding start operation. The yarn splicing operation is an operation in which the yarn splicing device 38 performs yarn splicing. The winding start operation is an operation in which the winding unit 17 starts winding of the yarn 14 on the package 22. The suction start operation is an operation for switching the yarn trap 44 from the stopped state to the sucking state.
[0112] This yarn winding apparatus 10 allows the yarn trap 44 to be in the stopped state for the predetermined first time after the winding start operation. In this way, operating time of the suction device 19 can be reduced, so as to reduce power consumption in the suction device 19. In addition, failure in yarn splicing or mixing of a foreign object into the package 22 are suppressed.
[0113] The yarn winding apparatus 10 performs control so that the yarn trap 44 becomes the stopped state before the yarn splicing operation is performed.
[0114] This yarn winding apparatus 10 reduces power consumption in the suction device 19.
[0115] The yarn winding apparatus 10 further includes the clearer 40 and the cutter 42. The clearer 40 detects a state of the traveling yarn 14. Note that states of the yarn 14 include presence or absence of a yarn defect, and whether or not the yarn 14 is traveling. The cutter 42 cuts the yarn 14. The yarn trap 44 is disposed on the downstream side of the cutter 42 in the traveling direction of the yarn 14 when winding the yarn. The unit control section 50 performs control so that the yarn 14 is cut by the cutter 42, and that the yarn trap 44 becomes the sucking state, on the basis of a detection result by the clearer 40.
[0116] This yarn winding apparatus 10 allows the yarn trap 44 to be in the sucking state, in synchronization with timing of cutting the yarn 14, which tends to cause a foreign object such as lint or cotton fly. In this way, mixing of a foreign object into the package 22 is suppressed.
[0117] The yarn winding apparatus 10 further includes the injection unit 111 that injects air to a space in which the yarn 14 in the clearer 40 travels. The unit control section 50 performs control so that the yarn 14 is cut by the cutter 42 and that the yarn trap 44 becomes the sucking state. After that, the unit control section 50 performs control so that the yarn trap 44 becomes the stopped state. After that, the unit control section 50 performs control so that air is injected by the injection unit 111.
[0118] This yarn winding apparatus 10 allows the yarn trap 44 to be in the sucking state when cutting the yarn 14, and after that, switches the same to the stopped state, and then allows the injection unit 111 to inject air. Because the suction is stopped when the air is injected, a foreign object such as lint or cotton fly can be easily scattered.
[0119] 2. Variations
In the following description, only structures different from that of this embodiment are described.
[0120] (1) Variation A
In the first embodiment, the unit control section 50 allows the shutter 194 to perform the suction stop operation at time point t11, and controls the shutter 194 to allow the flow path 192a to be in the opened state at time point t12. However, the unit control section 50 may control the shutter 194 to allow the flow path 192a to be in the opened state, and allows the shutter 194 to perform the suction stop operation, at time point t12. As a result, the sucking and catching unit 33 is in the sucking state, and the suction inlet of the yarn trap 44 becomes the stopped state.
[0121] In this variation, the flow path 192a and the flow path 192b are switched at one time, and hence the number of times for the unit control section 50 to control the shutter 194 can be reduced.
[0122] (2) Variation B
In the first embodiment, if it is determined that there is a yarn defect, the unit control section 50 allows the shutter 194 to perform the suction start operation, and then activates the cutter 42 to cut the yarn 14. However, the unit control section 50 may first activate the cutter 42 to cut the yarn 14, and then allow the shutter 194 to perform the suction start operation.
[0123] In this variation, the yarn winding apparatus 10 can suck and remove a foreign object such as lint or cotton fly generated due to cutting of the yarn 14 by the cutter 42, using the yarn trap 44. In addition, mixing of a foreign object into the package 22 can be suppressed.
[0124] (3) Variation C
In the first embodiment, if it is determined that the yarn 14 has stopped traveling, the unit control section 50 allows the shutter 194 to perform the suction start operation, and then activates the cutter 42 to cut the yarn 14. However, the unit control section 50 may first activate the cutter 42 to cut the yarn 14, and then allows the shutter 194 to perform the suction start operation.
[0125] In this variation, the yarn winding apparatus 10 can suck and remove a foreign object such as lint or cotton fly generated due to cutting of the yarn 14 by the cutter 42, using the yarn trap 44. In addition, mixing of a foreign object into the package 22 can be suppressed.
[0126] (4) Variation D
In the first embodiment, the unit control section 50 allows the shutter 194 to perform the suction start operation, after the predetermined first time has elapsed after the winding start operation (Step S111 in Fig. 3). After that, the unit control section 50 may allow the shutter 194 to perform the suction stop operation, after the predetermined second time has elapsed after the suction start operation and when the package 22 is being formed. As a result, the suction inlet of the yarn trap 44 is switched from the sucking state to the stopped state. By allowing the suction inlet of the yarn trap 44 to be in the stopped state in the winding step, power consumption in the suction device 19 can be reduced.
[0127] (5) Variation E
The package forming process when detecting a yarn defect in the first embodiment is a process that is performed if a yarn defect is detected during the stopped state of the suction inlet of the yarn trap 44. In other words, the process may be performed if a yarn defect is detected during the stopped state of the suction inlet of the yarn trap 44, in the winding step of variation D.
[0128] (6) Variation F
The package forming process, in the case where travel stop of the yarn 14 is detected in the first embodiment, is a process that is performed if travel stop of the yarn 14 is detected during the stopped state of the suction inlet of the yarn trap 44. In other words, the process may be performed if travel stop of the yarn 14 is detected during the stopped state of the suction inlet of the yarn trap 44, in the winding step of variation D.
[0129] (7) Variation G
In the first embodiment, the unit control section 50 allows the shutter 194 to perform the suction stop operation, and then sends a control signal to the valve 113, so as to open the air flow path 112, thereby compressed air is injected from the nozzle of the injection unit 111 (Step S205 in Fig. 5, Step S305 in Fig. 7). However, the unit control section 50 may inject compressed air from the nozzle of the injection unit 111 without allowing the shutter 194 to perform the suction stop operation. Because the unit control section 50 does not allow the shutter 194 to perform the suction stop operation, cycle time is shortened.
[0130] 3. Other embodiment
Although embodiments of the present invention are described above, the present invention is not limited to the embodiments described above, but can be variously modified within the scope of the invention without deviating from the spirit thereof. In particular, the plurality of embodiments and variations described in this specification can be arbitrarily combined as necessary.

INDUSTRIAL APPLICABILITY
[0131] The yarn winding apparatus of the present disclosure can be applied to an automatic winder, an air spinning machine, or an open-end spinning machine, in which a plurality of yarn winding apparatuses are arranged and used. In the case of the air spinning machine, or the open-end spinning machine, it may be possible to cut yarn by stopping spinning, without using a cutter as a cutting unit. In addition, the yarn winding apparatus of the present disclosure can be widely applied to textile machinery for manufacturing fibers.
, Claims:We claim:

1. A yarn winding apparatus (10) comprising:
a yarn feeding unit (15) configured to feed yarn (14);
a winding unit (17) configured to wind the yarn (14) fed from the yarn feeding unit (15) so as to form a package (22);
a yarn splicing device (38) configured to splice the yarn (14) on a side of the package (22) and the yarn (14) on a side of the yarn feeding unit (15);
a suction unit (44) disposed between the yarn splicing device (38) and the winding unit (17), so as to suck the yarn (14); and
a control section (50), wherein
the control section (50) performs control so that a yarn splicing operation for the yarn splicing device (38) to perform yarn splicing, a winding start operation for the winding unit (17) to start winding of the yarn (14) on the package (22), and a suction start operation to switch the suction unit (44) from a stopped state to a sucking state are performed in order, and that the suction start operation is performed after the predetermined first time has elapsed after the winding start operation.

2. The yarn winding apparatus (10) as claimed in claim 1, wherein the control section (50) performs control so that the suction unit (44) becomes the stopped state before the yarn splicing operation is performed.

3. The yarn winding apparatus (10) as claimed in claim 1 or 2, wherein the control section (50) performs control so that the suction unit (44) becomes the stopped state after a predetermined second time has elapsed after the suction start operation and when the package (22) is being formed.

4. The yarn winding apparatus (10) as claimed in one of claims 1 to 3, comprising:
a detection unit (40) configured to detect a state of the traveling yarn (14); and
a cutting unit (42) configured to cut the yarn (14), wherein
the suction unit (44) is disposed on a downstream side of the cutting unit (42) in a traveling direction of the yarn (14) when winding the yarn, and
the control section (50) performs control so that the yarn (14) is cut by the cutting unit (42), and that the suction unit (44) becomes the sucking state, on the basis of a detection result by the detection unit (40).

5. The yarn winding apparatus (10) as claimed in claim 4, comprising an injection unit (111) configured to inject air to a space in which the yarn (14) in the detection unit (40) travels, wherein
the control section (50) performs control so that the yarn (14) is cut by the cutting unit (42) and that the suction unit (44) becomes the sucking state,
then the control section (50) performs control so that the suction unit (44) becomes the stopped state, and
then the control section (50) performs control so that the injection unit (111) injects air.

6. The yarn winding apparatus (10) as claimed in claim 4, comprising an injection unit (111) configured to inject air to a space in which the yarn (14) in the detection unit (40) travels, wherein
the control section (50) performs control so that the yarn (14) is cut by the cutting unit (42) and that the suction unit (44) becomes the sucking state, and
then the control section (50) performs control so that the injection unit (111) injects air.

7. A yarn winding apparatus (10) comprising:
a yarn feeding unit (15) configured to feed yarn (14);
a winding unit (17) configured to wind the yarn (14) fed from the yarn feeding unit (15) so as to form a package (22);
a yarn splicing device (38) configured to splice the yarn (14) on a side of the package (22) and the yarn (14) on a side of the yarn feeding unit (15);
a suction unit (44) disposed between the yarn splicing device (38) and the winding unit (17), so as to suck the yarn (14);
a control section (50);
a detection unit (40) configured to detect a state of the traveling yarn (14); and
a cutting unit (42) configured to cut the yarn (14), wherein
the suction unit (44) is disposed on a downstream side of the cutting unit (42) in a traveling direction of the yarn (14) when winding the yarn,
the control section (50) performs control so that the suction unit (44) becomes the stopped state when forming the package (22), and
the control section (50) performs control so that the yarn (14) is cut by the cutting unit (42) and that the suction unit (44) becomes the sucking state, on the basis of a detection result by the detection unit (40).