Core yarn supply device, air spinning machine, spinning method, and package

Abstract

The invention provides a core yarn supply device, an air spinning machine, a spinning method and a package. A core wire supply device is provided with: a core wire bobbin holding unit for holding a core wire bobbin around which a core wire is wound; a core wire feeding unit that feeds a core wire; a slack securing unit that is provided between the core bobbin holding unit and the core feeding unit in the advancing direction of the core and that secures slack of the core; and a return prevention unit that is provided between the core bobbin holding unit and the slack securing unit in the traveling direction and that prevents a slack securing portion of the core wire, the slack of which has been secured by the slack securing unit, from returning in a direction opposite to the traveling direction.

Description

Technical Field

[0001] The present disclosure relates to a core yarn supply device, an air spinning machine, a spinning method and a package. Background Art

[0002] A spinning machine is known, which supplies a core thread to a drafting device through a core thread supply device, and uses the core thread as a thread core to generate yarn through an air spinning device (for example, refer to Patent Document 1: Japanese Patent Gazette No. 2016-102268). The spinning machine has a core thread delivery unit that delivers the core thread and a slack giving section that gives slack to the core thread. If a yarn defect is detected in the spinning machine or the absence of yarn (core thread or spun yarn) is detected, the supply of the core thread is interrupted, and the core thread on the downstream side of the core thread delivery unit is cut off. The slack giving section switches to a slack giving state, and slack is given to the core thread. As a result, when the supply of the core thread is restarted, the core thread can be effectively delivered to the drafting device by the action of air.

[0003] In the core wire supply device, there is a case where a core wire with elasticity is used. In the above-mentioned conventional core wire supply device, slack is given to the core wire by a slack giving part. When the core wire is fed out, the elastic core wire has a tendency to shrink in a direction opposite to the feeding direction. In this case, there is a possibility that the core wire is not properly fed to the drafting device. Summary of the invention

[0004] An object of the present disclosure is to provide a core yarn supplying device, an air spinning machine, and a spinning method that can appropriately feed out a core yarn even when using a stretchable core yarn.

[0005] The core wire supply device involved in one embodiment of the present invention comprises: a core wire bobbin holding portion, which holds the core wire bobbin wound with the core wire; a core wire delivery portion, which delivers the core wire; a slack ensuring portion, which is arranged between the core wire bobbin holding portion and the core wire delivery portion in the traveling direction of the core wire and ensures the slack of the core wire; and a return preventing portion, which is arranged between the core wire bobbin holding portion and the slack ensuring portion in the traveling direction and prevents the slack ensuring portion of the core wire, which has been ensured to be slack by the slack ensuring portion, from returning in a direction opposite to the traveling direction.

[0006] According to the core wire supply device, the return prevention portion provided at a position upstream of the slack ensuring portion in the core wire traveling direction prevents the slack ensuring portion of the core wire from returning upstream. Therefore, even when a retractable core wire is used, an appropriate delivery distance of the core wire by the core wire delivery portion is achieved. Thus, the core wire can be properly delivered.

[0007] Alternatively, the return preventing portion can be switched between a return preventing state for preventing the slack securing portion of the core wire from returning and a release state for freeing the slack securing portion of the core wire, and the return preventing portion is switched from the return preventing state to the release state when the core wire starts to be fed out by the core wire feeding portion or just after the core wire is fed out. In this case, when the core wire is fed out, the slack securing portion of the core wire can be effectively prevented from returning upstream.

[0008] Also can be, the return prevention part is a clamping device that clamps the core wire. In this case, the clamping device physically clamps the core wire, therefore, it is possible to prevent the core wire from being displaced upstream.

[0009] Alternatively, the core wire supply device further includes a tension applying portion, which is disposed between the core wire bobbin holding portion and the core wire delivery portion in the traveling direction and applies tension to the core wire during the supply of the core wire. In this case, the core wire is properly delivered by the core wire delivery portion.

[0010] Alternatively, the clamping device may be arranged between the tension applying portion and the slack ensuring portion in the traveling direction. According to this layout, the distance between the slack ensuring portion and the clamping device becomes closer, and the propagation of the contraction of the core wire is reduced. As a result, the reduction of the slack amount can be avoided.

[0011] Alternatively, the tension applying unit may function as a return preventing unit by applying tension to the core wire during the supply stop of the core wire. In this case, the tension applying unit applies tension to the core wire during the supply stop of the core wire, and prevents the loosened and secured portion from returning during the supply stop of the core wire. The tension applying unit has both functions, and therefore, there is no need to provide a clamping device separately.

[0012] Alternatively, the core yarn supply device further includes a base portion that supports the slack ensuring portion. At least one yarn path guide is fixed to the base portion, and the at least one yarn path guide guides the core yarn so that the core yarn travels on a straight regular yarn path during the supply of the core yarn. The slack ensuring portion includes: an arm that is movably mounted on the base portion and has two core yarn passing portions formed therein; and a drive portion that moves the arm, and when the arm is arranged in a normal position, the yarn path guide and the two core yarn passing portions are arranged on the regular yarn path, and when the arm is arranged in a slack ensuring position, the core yarn is guided to be bent at least four times. In this case, by bending the core yarn in an M-shape, a larger slack can be ensured in a smaller space.

[0013] Alternatively, the slack securing portion may be provided with an adjusting portion capable of adjusting the path length of the slack securing portion of the core wire. The path length of the slack securing portion is adjusted according to the elasticity of the core wire, thereby enabling the core wire to be properly delivered to the drafting device regardless of the type of the core wire.

[0014] Alternatively, the core wire delivery unit changes the delivery force according to the path length of the slack-ensured portion of the core wire. By changing the delivery force according to the path length of the slack-ensured portion, the core wire can be properly delivered to the drafting device regardless of the type of the core wire.

[0015] As another embodiment of the present disclosure, an air spinning machine may be provided, comprising: any one of the core yarn supply devices as described above; a drafting device that drafts a fiber bundle; an air jet spinning device that uses the core yarn supplied from the core yarn supply device as a yarn core and spins the fiber bundle drafted by the drafting device, thereby generating a yarn containing the core yarn; and a winding device that winds the yarn into a package. In the air spinning machine, the core yarn delivery portion of the core yarn supply device is arranged to face a position between the middle roller pair and the front roller pair of the drafting device. According to the air spinning machine, the core yarn can be properly delivered to the drafting device through the above-mentioned actions. The yarn containing the elastic core yarn can be properly generated to form a package.

[0016] Alternatively, in the air spinning machine, the length of the slack ensuring portion of the core yarn formed by the slack ensuring portion is more than 1 time and less than 3 times the distance from the clamping portion in the core yarn delivery portion to the top roller of the front roller pair. In this case, the core yarn delivered by the core yarn delivery portion reliably reaches the front roller pair.

[0017] As another embodiment of the present disclosure, a spinning method of an air spinning machine can also be provided, the air spinning machine comprising: a core wire supplying device, which comprises a core wire bobbin holding portion for holding a core wire bobbin wound with a core wire, a core wire delivering portion for delivering the core wire, a slack ensuring portion which is arranged between the core wire bobbin holding portion and the core wire delivering portion in the traveling direction of the core wire and ensures slack of the core wire, and a return preventing portion which is arranged between the core wire bobbin holding portion and the slack ensuring portion in the traveling direction and prevents a slack ensuring portion of the core wire, which has been ensured to be slack by the slack ensuring portion, from returning in a direction opposite to the traveling direction; a drafting device which drafts a fiber bundle; and a jet spinning device which uses the core wire supplied from the core wire supplying device as a fiber core and spins the fiber bundle drafted by the drafting device, thereby generating yarn containing the core wire. In the spinning method, a core yarn having elasticity is fed out from a core yarn feeding portion disposed at a position facing between a middle roller pair and a front roller pair of a drafting device, and a yarn containing the core yarn is produced by an air jet spinning device. According to the spinning method, the core yarn can be properly fed out to the drafting device by the above-mentioned action. The yarn containing the core yarn having elasticity can be properly produced and formed into a package.

[0018] As another embodiment of the present disclosure, a package may be provided, wherein a yarn having a stretchable core yarn produced by air jet spinning is wound thereon. Alternatively, in the package, the intervals between a plurality of joints included in the yarn are longer than the intervals between periodic joints produced by bobbin replacement, and the yarn does not have a joint produced by core yarn replacement. A preferred package having a small number of joints is provided.

[0019] Preferably, in the package, the core yarn is composed of two polymers and has a stretch elongation of 50% or more. Yarns with high stretch elongation are generally difficult to splice. According to the package, the number of splices is small, so even if the package includes yarns with high stretch elongation, a high-quality package is provided.

[0020] According to the present disclosure, even when a core wire having elasticity is used, the core wire can be appropriately fed out. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of the spinning machine according to one embodiment of the present disclosure.

[0022] Figure 2 yes Figure 1 Side view of the spinning unit of a spinning machine.

[0023] Figure 3 yes Figure 2 A three-dimensional view of the core thread supply unit of the spinning unit.

[0024] Figure 4 This is an enlarged view of the slack securing portion and the vicinity of the clamping device.

[0025] Figure 5 It is a block diagram of the parts that work through air.

[0026] Figure 6 It is a diagram showing an example of a state in which the slack ensuring portion is arranged at the slack ensuring position.

[0027] Figure 7 yes Figure 6 An enlarged view of the slack securing portion and the vicinity of the clamping device in the state of .

[0028] Figure 8 It is a diagram showing another example of a state in which the slack ensuring portion is arranged at the slack ensuring position.

[0029] Fig.9A 1 is a diagram showing the interval between joints in a package according to an embodiment of the present disclosure. Fig. 9B It is a figure which shows the interval of the joint in the package of a reference method. DETAILED DESCRIPTION

[0030] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, the same reference numerals are given to the same or corresponding parts in each figure, and repeated descriptions are omitted.

[0031] like Figure 1 As shown, the spinning machine 1 (air spinning machine) includes a plurality of spinning units 2, a yarn joining trolley 3, a yarn doffing trolley (not shown), a first end frame 4, and a second end frame 5. The plurality of spinning units 2 are arranged in a row. Each spinning unit 2 generates a yarn Y and winds the yarn Y into a package P. When the yarn Y is cut in a certain spinning unit 2 or the yarn Y breaks for some reason, the yarn joining trolley 3 performs a yarn joining operation on the spinning unit 2. When the package P becomes fully wound in a certain spinning unit 2, the yarn doffing trolley doesffs the package P and supplies a new bobbin B to the spinning unit 2. The first end frame 4 accommodates a recovery device for recovering waste fibers and silk scraps generated in the spinning unit 2.

[0032] The second end frame 5 accommodates an air supply unit for adjusting the air pressure of compressed air (air) supplied to the spinning machine 1 and supplying air to each part of the spinning machine 1, and a drive motor for supplying power to each part of the spinning unit 2. The second end frame 5 is provided with a machine control device 41, a display screen 42, and an input key 43. The machine control device 41 centrally manages and controls each part of the spinning machine 1. The display screen 42 can display information related to the setting content and status of the spinning unit 2. The operator can perform the setting operation of the spinning unit 2 by performing appropriate operations using the input key 43.

[0033] In the following description, the yarn S and the fiber bundle F (see Figure 2 ) and the traveling path of the yarn Y, the side where the yarn S is supplied is called the upstream, and the side where the yarn Y is wound is called the downstream. The side where the yarn Y travels relative to the spinning unit 2 is called the front side. In the present embodiment, an operation passage (not shown) extending in the arrangement direction of the plurality of spinning units 2 is provided at the front side of the spinning machine 1. The operator can operate and monitor each spinning unit 2 from the operation passage.

[0034] like Figure 1 and Figure 2 As shown, each spinning unit 2 includes a drafting device 6 and a core yarn supply device 200, an air spinning device (jet spinning device) 7, a yarn monitoring device 8, a tension sensor 9, a yarn accumulation device 11, a waxing device 12, and a winding device 13 in order from the upstream in the traveling direction of the yarn Y. The unit controller 10 is provided for each predetermined number of spinning units 2 and controls the operation of the spinning units 2.

[0035] The drafting device 6 drafts the yarn (fiber bundle) S. The drafting device 6 has a rear roller pair 14, a third roller pair 15, an intermediate roller pair 16, and a front roller pair 17 in the direction of travel of the yarn S from the upstream. Each roller pair 14, 15, 16, 17 has a lower roller and an upper roller. The lower roller is driven to rotate by a drive motor provided on the second end frame 5 or a drive motor provided on each spinning unit 2. An apron 18a is provided for the lower roller of the intermediate roller pair 16. An apron 18b is provided for the upper roller of the intermediate roller pair 16.

[0036] The core yarn supply device 200 unwinds the core yarn C from the core yarn package CP and supplies the core yarn C to the air spinning device 7. Specifically, the core yarn supply device 200 supplies the core yarn C from between the middle roller pair 16 and the front roller pair 17 of the drafting device 6 to the traveling path of the fiber bundle F. Thus, the core yarn supply device 200 supplies the core yarn C to the air spinning device 7.

[0037] The air spinning device 7 uses the core wire C supplied from the core wire supply device 200 as a fiber core, and twists the fiber bundle F drafted by the drafting device 6 through a swirling air flow to generate a yarn Y. In more detail, the air spinning device 7 has a spinning chamber, a fiber guide portion, a swirling air flow generating nozzle, and a hollow guide shaft (however, not shown in the figure). The fiber guide portion guides the core wire C supplied from the core wire supply device 200 arranged upstream and the fiber bundle F supplied from the drafting device 6 into the spinning chamber. The swirling air flow generating nozzle is arranged around the path along which the core wire C and the fiber bundle F travel. By ejecting air from the swirling air flow generating nozzle, a swirling air flow is generated in the spinning chamber. Through the swirling air flow, each fiber end of the plurality of fibers constituting the fiber bundle F is reversed and swirled. The hollow guide shaft guides the yarn Y from the spinning chamber to the outside of the air spinning device 7.

[0038] The yarn monitoring device 8 monitors information of the yarn Y running between the air spinning device 7 and the yarn accumulation device 11, and detects the presence or absence of a yarn defect based on the monitored information. When the yarn monitoring device 8 detects a yarn defect, it sends a yarn defect detection signal to the unit controller 10. The yarn monitoring device 8 detects, for example, at least one of an abnormal thickness of the yarn Y and a foreign object contained in the yarn Y as a yarn defect. The yarn monitoring device 8 also detects yarn breakage (the presence or absence of the yarn Y), etc. The tension sensor 9 measures the tension of the yarn Y running between the air spinning device 7 and the yarn accumulation device 11, and sends a tension measurement signal to the unit controller 10. When it is determined that the unit controller 10 has an abnormality based on the detection result of at least one of the yarn monitoring device 8 and the tension sensor 9, the yarn Y is cut in the spinning unit 2. Specifically, the supply of air to the air spinning device 7 is stopped, the generation of the yarn Y is interrupted, and the yarn Y is cut. Alternatively, the yarn Y may be cut by a separately provided cutter.

[0039] The waxing device 12 waxes the yarn Y between the yarn accumulating device 11 and the winding device 13 .

[0040] The yarn accumulation device 11 accumulates the yarn Y between the air spinning device 7 and the winding device 13. The yarn accumulation device 11 has a yarn accumulation roller that accumulates the yarn Y by winding the yarn Y around the outer peripheral surface. The yarn accumulation device 11 has the functions of stably pulling out the yarn Y from the air spinning device 7, preventing the yarn Y sent out from the air spinning device 7 from being retained and loosened when the yarn joining carriage 3 performs a yarn joining operation, and preventing the change in the tension of the yarn Y downstream of the yarn accumulation device 11 from being transmitted to the air spinning device 7.

[0041] The winding device 13 winds the yarn Y generated by the air spinning device 7 around the bobbin B to form a package P. The winding device 13 includes a cradle arm 21, a winding drum 22, and a traverse guide 23. The cradle arm 21 supports the bobbin B so that it can rotate. The cradle arm 21 is supported by a support shaft 24 so that it can swing, so that the surface of the bobbin B or the surface of the package P contacts the surface of the winding drum 22 with an appropriate pressure. A drive motor (not shown) provided on the second end frame 5 drives the winding drums 22 of the plurality of spinning units 2 simultaneously. As a result, in each spinning unit 2, the bobbin B or the package P rotates in the winding direction. The traverse guide 23 of each spinning unit 2 is provided on a shaft body 25 shared by the plurality of spinning units 2. The drive motor of the second end frame 5 drives the shaft body 25 to reciprocate along the axial direction of the rotating shaft of the winding drum 22, so that the traverse guide 23 causes the yarn Y to traverse with respect to the rotating bobbin B or the package P at a predetermined width.

[0042] When the yarn Y is cut in a certain spinning unit 2 or the yarn Y is broken for some reason, the yarn joining carriage 3 moves to the spinning unit 2 to perform the yarn joining operation. The yarn joining carriage 3 has a yarn joining device 26, a suction pipe 27, and a suction nozzle 28. The suction pipe 27 is supported by a support shaft 31 so as to be rotatable, and catches the yarn Y from the air spinning device 7 and guides it to the yarn joining device 26. The suction nozzle 28 is supported by a support shaft 32 so as to be rotatable, and catches the yarn Y from the winding device 13 and guides it to the yarn joining device 26. The yarn joining device 26 joins the guided yarns Y to each other. The yarn joining device 26 is a yarn joiner using compressed air or a knotter that mechanically joins the yarn Y.

[0043] When the yarn splicing carriage 3 performs the yarn splicing operation, the package P is rotated in the opposite direction to the winding direction (reversed). At this time, the cradle arm 21 is moved by the cylinder (not shown) so that the package P is separated from the winding drum 22, and the package P is reversed by the reversing roller (not shown) provided on the yarn splicing carriage 3.

[0044] The core wire supply device 200 is described in more detail. Figure 2 As shown, the core wire supply device 200 includes a core wire bobbin holding portion 50 , a core wire supply unit 51 , and a core wire guide portion 52 .

[0045] The core wire bobbin holding portion 50 holds the core wire package CP formed by winding the core wire C on the core wire bobbin CB. The core wire bobbin holding portion 50 supports the core wire package CP at a position upstream of the core wire supply unit 51 in the traveling direction of the core wire C (hereinafter referred to as the core wire traveling direction). The core wire supply unit 51 supplies the core wire C while applying tension to the core wire C unwound from the core wire package CP and guided via the guide roller 53. The core wire guide portion 52 guides the core wire C supplied from the core wire supply unit 51 to between the middle roller pair 18 and the front roller pair 17 of the drafting device 6.

[0046] The core wire supply device 200 of the present embodiment can supply the elastic core wire C. However, the core wire supply device 200 may be capable of supplying other types of core wires C (for example, a monofilament core wire or a multifilament core wire).

[0047] The core yarn C having elasticity may be composed of two polymers (so-called double-core yarn) or one polymer (so-called single-core yarn). As an example of a double-core yarn, the core yarn C may be a yarn composed of polyurethane (PU) or polyester filament (T400; manufactured by Toray Operantex Co., Ltd.). The elasticity of the core yarn C refers to a value showing an elastic elongation of 50% or more in the elasticity measurement standard of JIS (Japanese Industrial Standard) L1013, for example.

[0048] like Figure 3 As shown, the core wire supply unit 51 includes a unit base 60 (base portion), a core wire detection device 90, a tension applying portion 70, a slack ensuring portion 80, and a core wire feeding portion 100. In the following description, a position close to the core wire bobbin holding portion 50 in the core wire running direction is referred to as upstream, and a position close to the core wire guide portion 52 is referred to as downstream.

[0049] The unit base 60 supports the core yarn detection device 90, the slack securing portion 80, the tension applying portion 70, and the core yarn delivery portion 100. A normal yarn path that is generally linear during the supply of the core yarn C is formed on the unit base 60. The core yarn detection device 90, the tension applying portion 70, and the core yarn delivery portion 100 are arranged along the normal yarn path. A core yarn guide 61 for guiding the core yarn C is provided at the most upstream of the unit base 60.

[0050] The tension applying portion 70 applies tension to the core wire C during the supply of the core wire C. The tension applying portion 70 applies tension to the core wire C at a position downstream of the core wire guide 61 in the direction in which the core wire is traveling. The tension applying portion 70 has a rectangular box-shaped fixed plate 73 that is open upward and a movable plate 74 that is installed to be rotatable relative to the fixed plate 73. The movable plate 74 is urged in a direction to open from the fixed plate 73 by a spring (not shown) provided on the fixed plate 73. An axis (not shown) that is orthogonal or substantially orthogonal to the direction in which the core wire is traveling is provided on the fixed plate 73. A plurality of axis bodies are provided at predetermined intervals along the direction in which the core wire is traveling. A hole is formed at each end of a plurality of protrusions provided on the movable plate 74. The core wire C is hung alternately relative to the above-mentioned axis bodies and holes. Therefore, as Figure 3 As shown in FIG. 1 , if the movable piece 74 is opened relative to the fixed piece 73, the core yarn C is bent multiple times. In this state, if the core yarn C is pulled downstream by the drafting device 6 and the air spinning device 7 (that is, if the core yarn C advances), tension is applied to the core yarn C downstream of the tension applying portion 70 (including the tension applying portion 70) in the core yarn advancing direction. The state of the tension applying portion 70 at this time is referred to as a tension applied state.

[0051] When the movable piece 74 is closed relative to the fixed piece 73, the core wire C becomes substantially straight. As a result, the tension applied to the core wire C at the downstream of the tension applying part 70 including the tension applying part 70 is released (or the tension becomes close to zero). The state of the tension applying part 70 at this time is referred to as the tension non-applied state. The tension applying part 70 has an operating member 75 and a cylinder 76 (see Figure 5). The operating member 75 is moved by the air cylinder 76, thereby making the operating member 75 contact and leave relative to the movable piece 74. If air is supplied to the air cylinder 76, the operating member 75 moves to the lower side (the direction in which the movable piece 74 is closed relative to the fixed piece 73). As a result, the movable piece 74 is closed, and the tension applying part 70 is switched to a tension non-applying state. If the supply of air to the air cylinder 76 is stopped, the operating member 75 leaves the movable piece 74 and moves to the upper side (the direction in which the movable piece 74 is opened relative to the fixed piece 73). As a result, the movable piece 74 is opened, and the tension applying part 70 is switched to a tension applying state.

[0052] like Figure 3 As shown in FIG. 1 , the slack securing portion 80 is provided on the core wire bobbin holding portion 50 (see FIG. 1 ) in the core wire running direction. Figure 2 ) and the core yarn delivery section 100. The slack ensuring section 80 provides slack to the core yarn C at a position downstream of the tension applying section 70 in the direction of core yarn travel. The slack ensuring section 80 ensures slack of the core yarn C at a position downstream of the tension applying section 70 in the direction of core yarn travel. The slack ensuring section 80 includes an arm 81 and a cylinder 82 (driving section). The arm 81 is rotatably mounted on the unit base 60 via a support shaft 81c. The arm 81 is rotated by the cylinder 82. If air is supplied to the cylinder 82, the terminal end 81b of the arm body 81a is moved to a position away from the normal yarn path ( Figure 3 At this time, the arm 81 is arranged at the slack ensuring position P2. If the supply of air to the cylinder 82 is stopped, the terminal end 81b of the arm body 81a moves to the path of the core wire C ( Figure 3 At this time, the arm 81 is arranged at the normal position P1.

[0053] like Figure 3 and Figure 4 As shown, the arm 81 has: an arm body 81a, for example, an elongated plate-shaped arm body 81a extending from a fulcrum portion 81e supported by a support shaft 81c; and an adjustment portion 85, which is mounted on the terminal portion 81b of the arm body 81a. A plate-shaped first protrusion 83 extending from the arm body 81a perpendicularly thereto is provided at the terminal portion 81b of the arm body 81a. The adjustment portion 85 is mounted via a support shaft 85c so as to be rotatable relative to the terminal portion 81b of the arm body 81a. The support shaft 85c of the adjustment portion 85 is parallel to the support shaft 81c of the arm body 81a. The adjustment portion 85 can be in a state where the adjustment portion 85 is unfolded relative to the arm body 81a (refer to Figure 3 , Figure 4 and Figure 6 ) and the adjustment portion 85 are in a state of rotation and retreat relative to the arm body 81a (see Figure 8 ) are fixed to the arm body 81a in their respective states.

[0054] The adjustment part 85 includes a base piece 85a, for example, in the form of a plate, which partially overlaps with the end part 81b of the arm body 81a. The base piece 85a is installed on the opposite side of the first protrusion 83 so that the adjustment part 85 does not interfere with the first protrusion 83. Figure 3 and Figure 4 As shown, the base piece 85a protrudes from the terminal portion 81b of the arm body 81a along the imaginary extension surface of the arm body 81a when the adjustment portion 85 is unfolded. A plate-shaped second protrusion 84 extending perpendicularly to the base piece 85a is provided at the terminal end of the base piece 85a. When the adjustment portion 85 is unfolded, the first protrusion 83 and the second protrusion 84 are, for example, parallel. When the arm 81 is arranged in the normal position P1, the first protrusion 83 and the second protrusion 84 intersect with the normal yarn path of the core thread C. A circular first engaging hole 83a is formed in the first protrusion 83 for passing the core thread C. A circular second engaging hole 84a is formed in the second protrusion 84 for passing the core thread C. The first engaging hole 83a and the second engaging hole 84a are two core thread engaging portions (core thread passing portions) provided at the terminal end of the arm 81.

[0055] When the arm 81 is arranged at the slack ensuring position P2, the core wire C ensures slack. The state of the slack ensuring portion 80 when the arm 81 is arranged at the slack ensuring position P2 is referred to as a slack ensuring state. The state of the slack ensuring portion 80 when the arm 81 is arranged at the normal position P1 is referred to as a slack non-ensured state.

[0056] The core wire delivery section 100 has the functions of delivering the core wire C to the drafting device 6, clamping the core wire C, and cutting the core wire C. The downstream end (exit) of the core wire delivery section 100 is arranged to face the position between the middle roller pair 16 and the front roller pair 17 of the drafting device 6 across the core wire guide portion 52. The core wire delivery section 100 has a clamping portion 106 (see Figure 3 ), tool (not shown), cylinder 108 (refer to Figure 5 ).

[0057] The core yarn delivery section 100 delivers the core yarn C to the drafting device 6 at a position downstream of the tension applying section 70 and the slack ensuring section 80 in the core yarn running direction. "Delivering the core yarn C" refers to the action of the core yarn delivery section 100 delivering the core yarn C (the yarn end of the core yarn C) to the drafting device 6 when the supply of the core yarn C starts (restarts). "Supplying the core yarn C" refers to the action of the core yarn supply device 200 continuously supplying the core yarn C to the drafting device 6 while applying tension to the core yarn C after the supply of the core yarn C starts (restarts) (after the core yarn delivery section 100 delivers the core yarn C) (i.e., the action during spinning).

[0058] The clamping section 106 clamps the core yarn C (the yarn end of the core yarn C) in the core yarn delivery section 100. The cutter has a function of cutting the core yarn C clamped by the clamping section 106.

[0059] If the cylinder 108 (refer to Figure 5 ) supplies air, the clamping portion 106 clamps the core wire C. The state of the clamping portion 106 at this time is called a clamping state. If the supply of air to the cylinder 108 is stopped, the clamping portion 106 releases the core wire C. The state of the clamping portion 106 at this time is called a non-clamping state.

[0060] The cutter cuts the core wire C at a position downstream of the clamping part 106 in the core wire travel direction. The cutter is driven by the cylinder 108 and operates in conjunction with the clamping part 106. The cutter cuts the core wire C when the clamping part 106 switches from the non-clamping state to the clamping state.

[0061] like Figure 3 As shown in the figure, the core wire detection device 90 detects the state of the core wire C, for example, at a position upstream of the tension applying portion 70 in the core wire running direction. For example, the core wire detection device 90 detects the presence or absence of the core wire C as the state of the core wire C. Thus, the core wire detection device 90 can detect the breakage of the core wire C. The core wire detection device 90 can detect the disappearance of the core wire C of the core wire package CP instead of detecting the breakage of the yarn, or the core wire detection device 90 can detect the disappearance of the core wire C of the core wire package CP in addition to detecting the breakage of the yarn. A core wire guide 62 for guiding the core wire C is arranged upstream of the core wire detection device 90 in the core wire running direction.

[0062] The core yarn detection device 90 is an optical sensor having a light projecting unit 91 and a light receiving unit 92. The light projecting unit 91 projects light onto the core yarn C passing through the core yarn detection device 90. The light projecting unit 91 is composed of, for example, a light emitting diode. The light projection of the light projecting unit 91 is controlled by the unit controller 10. A yarn path is formed between the light projecting unit 91 and the light receiving unit 92. The core yarn detection device 90 detects the state of the core yarn C traveling on the yarn path in a non-contact manner.

[0063] The light receiving unit 92 receives the light transmitted through the core wire C from the light projecting unit 91. The light receiving unit 92 is, for example, a photodiode, converts the intensity of the received light into an electrical signal, and outputs the electrical signal to the unit controller 10. Alternatively, the light receiving unit 92 may receive the light reflected by the core wire C from the light projecting unit 91. As the core wire detection device 90, the tension applying unit 70, and the core wire delivery unit 100, for example, the structure described in the above-mentioned patent document 1 or other well-known structures can be adopted.

[0064] like Figure 4As shown in FIG. 1 , the core wire supply unit 51 further includes a clamping device 110 provided between the core wire bobbin holding portion 50 and the slack securing portion 80 in the core wire running direction. In other words, the clamping device 110 is arranged upstream of the first engaging hole 83a (the first engaging hole 83a and the second engaging hole 84a when the adjustment portion 85 is expanded) of the slack securing portion 80 located at the normal position P1 in the core wire running direction. The core wire supply unit 51 further includes a guide portion 120 arranged downstream of the clamping device 110 in the core wire running direction.

[0065] The clamping device 110 is arranged between the tension applying portion 70 and the slack ensuring portion 80. In other words, the clamping device 110 is arranged between the tension applying portion 70 and the first engaging hole 83a of the slack ensuring portion 80 located at the normal position P1. The clamping device 110 includes a receiving portion 114, a frame portion 112, and a clamping rod 113. The receiving portion 114 is a plate-shaped member extending in parallel with the normal yarn path, and is fixed to a base plate 121 (described later) of the guide portion 120. The frame portion 112 is arranged to surround the receiving portion 114. The receiving portion 114, the frame portion 112, and the clamping rod 113 are made of, for example, ceramic. The normal yarn path of the core wire C is located between the receiving portion 114 and the clamping rod 113. When the clamping rod 113 is located at the standby position, the clamping rod 113 is away from the normal yarn path of the core wire C. The receiving portion 114 is also away from the normal yarn path of the core wire C. A rubber member 116 such as a rubber pad is installed at the receiving portion 114. Alternatively, the rubber member 116 may be provided to surround the receiving portion 114. The rubber member 116 is installed at least on the surface of the receiving portion 114 facing the normal yarn path.

[0066] The clamping device 110 has a cylinder 118 (see Figure 5 ). The frame portion 112 is mounted on the end of the telescopic shaft 111 that can reciprocate in a direction perpendicular to the normal yarn path. The frame portion 112 is biased upward (in a direction away from the base end surface of the yarn path guide 95) by, for example, a spring (not shown). When air is supplied to the cylinder 118, the frame portion 112 is lowered via the telescopic shaft 111, and the core wire C is clamped between the clamping rod 113 and the receiving portion 114 (see Figure 7 The state of the clamping device 110 at this time is referred to as the clamping state. If the air supply to the cylinder 118 is stopped, the frame portion 112 is raised via the telescopic shaft 111, and the clamping rod 113 is separated from the core wire C (see Figure 4 The state of the clamping device 110 at this time is referred to as a non-clamping state.

[0067] The clamping device 110 is a return preventing portion that prevents the slack ensuring portion of the core wire C, which has been slack ensured by the slack ensuring portion 80, from returning in the direction opposite to the core wire traveling direction. The clamping device 110 prevents the slack ensuring portion of the core wire C from returning upstream of the clamping device 110 (i.e., toward the tension applying portion 70). The clamping state described above corresponds to a return preventing state in which the slack ensuring portion of the core wire C is prevented from returning. The non-clamping state described above corresponds to a released state in which the slack ensuring portion of the core wire C is released (becomes free).

[0068] The guide portion 120 includes a base plate 121, a yarn passing portion 122a, and a pair of escape limiting pieces 122. The base plate 121 includes: a fixed portion arranged parallel to the base end surface of the yarn path guide 95; and a main body extending perpendicularly thereto from the fixed portion. The yarn passing portion 122a is formed at the center of the main body of the base plate 121 in the width direction. The pair of escape limiting pieces 122 are continuously arranged with the upper portion (opposite to the fixed portion) of the base plate 121, and extend in parallel with each other in a manner covering the clamping rod 113. The yarn passing portion 122a allows the core thread C traveling on the normal yarn path to pass through. The pair of escape limiting pieces 122 limit the travel path of the core thread C. When the slack ensuring portion 80 is switched to the slack ensuring state, the core thread C moves near a fan-shaped area centered on the rotation range of the terminal portion 81b of the arm 81. The core thread C is arranged between the pair of escape limiting pieces 122 in normal spinning (refer to Figure 7 The pair of escape restriction pieces 122 restrict the core wire C from escaping from the fan-shaped region in the left-right direction (in the axial direction of the support shaft 81c).

[0069] The guide section 120 includes a plate-shaped yarn path guide 123 which is arranged between the first protruding piece 83 and the second protruding piece 84 when the arm 81 is arranged at the normal position P1. The yarn path guide 123 has a circular yarn passage hole 123a.

[0070] A plate-shaped yarn path guide 95 is provided at the downstream end of the unit base 60 and between the yarn path guide 123 and the core yarn delivery portion 100. A V-shaped engagement groove 95a is provided at the distal end of the yarn path guide 95. The engagement groove 95a guides the core yarn C by causing the core yarn C to abut against the bottom or oblique side of the engagement groove 95a.

[0071] like Figure 3 As shown, the core wire supply unit 51 further includes a first air supply pipe 54 , a second air supply pipe 55 , a relay substrate 56 , and a multi-core cable 57 .

[0072] like Figure 5As shown, the first air supply pipe 54 relays the air supply pipe connected to the air supply source (not shown) via the air supply portion of the second end frame 5 and the plurality of air supply pipes connected to the cylinders 118, 76, 82, 108, respectively. Thus, air is supplied from the second end frame 5 to the cylinders 118, 76, 82, 108 via the first air supply pipe 54.

[0073] The first solenoid valve 58 is installed on the first air supply pipe 54. The first solenoid valve 58 supplies and stops the supply of air from the second end frame 5 to each cylinder 118, 76, 82, 108. For example, when the yarn monitoring device 8 detects a yarn defect and the generation of the yarn Y is stopped in the spinning unit 2, the first solenoid valve 58 opens, and the clamping device 110 is switched to the clamping state, the tension applying portion 70 is switched to the tension non-applying state, the slack ensuring portion 80 is switched to the slack ensuring state, and the clamping portion 106 is switched to the clamping state. At this time, Figure 6 and Figure 7 As shown in the figure, the yarn passing portion 122a, the yarn passing hole 123a and the engaging groove 95a are arranged roughly in a straight line. The first protrusion 83 and the second protrusion 84 are separated from the area between the base plate 121 and the yarn path guide 95 and move upward. The core wire C is clamped by the clamping rod 113 and the receiving portion 114, and passes through the first engaging hole 83a, the yarn passing hole 123a and the second engaging hole 84a. When the arm 81 is arranged at the slack ensuring position P2, the core wire C is bent four times by the clamping rod 113, the first engaging hole 83a, the yarn passing hole 123a and the second engaging hole 84a.

[0074] When the production of the yarn Y is started (restarted) in the spinning unit 2, the first electromagnetic valve 58 is closed, the clamping device 110 is switched to the non-clamping state, the tension applying section 70 is switched to the tension applying state, the slack ensuring section 80 is switched to the slack non-ensured state, and the clamping section 106 is switched to the non-clamping state. Figure 3 and Figure 4 As shown in FIG. 1 , the yarn passage portion 122a, the first engaging hole 83a, the yarn passage hole 123a, the second engaging hole 84a and the engaging groove 95a are arranged substantially in a straight line. The core yarn C passes through the space between the clamping rod 113 and the receiving portion 114 in a non-contact manner, and passes through the yarn passage portion 122a, the first engaging hole 83a, the yarn passage hole 123a and the second engaging hole 84a, and is guided by the engaging groove 95a. When the arm 81 is arranged at the normal position P1, the yarn path guide 123 and the first engaging hole 83a and the second engaging hole 84a are arranged on the normal yarn path.

[0075] The second air supply pipe 55 relays the air supply pipe connected to the air supply source and the air supply pipe connected to the core wire delivery unit 100 . Thus, air is supplied from the second end frame 5 to the core wire delivery unit 100 via the second air supply pipe 55 .

[0076] A second electromagnetic valve 59 is mounted on the second air supply pipe 55. The second electromagnetic valve 59 supplies and stops the supply of air from the second end frame 5 to the core yarn delivery section 100. When the production of the yarn Y is started (restarted) in the spinning unit 2, the second electromagnetic valve 59 is opened. As a result, air is injected into the travel path of the core yarn C in the core yarn delivery section 100, and the core yarn C is delivered from the core yarn delivery section 100. If the second electromagnetic valve 59 is closed, the injection of air into the travel path of the core yarn C in the core yarn delivery section 100 stops, and therefore, the delivery action of the core yarn C by the core yarn delivery section 100 also stops.

[0077] The relay substrate 56 is electrically connected to the core wire detection device 90 , the first electromagnetic valve 58 , and the second electromagnetic valve 59 .

[0078] The multi-core cable 57 electrically relays the relay substrate 56 and a multi-core cable (not shown) connected to the unit controller 10 . Thus, the unit controller 10 can control the core wire supply unit 51 .

[0079] The operation of the core yarn supply device 200 and the spinning method using the core yarn supply device 200 are described below. Figure 3 As shown in the figure, when the core yarn C is supplied, the core yarn C is pulled by the drafting device 6 and the air spinning device 7, thereby moving toward the downstream of the core yarn traveling direction. At this time, the tension applying unit 70 is kept in the tension applying state. The core yarn C moves toward the drafting device 6 while being tensioned by the tension applying unit 70. During the supply of the core yarn C, the slack ensuring unit 80 is in the slack non-ensuring state, and the clamping unit 106 is in the non-clamping state.

[0080] Then, if Figure 6As shown, if a yarn defect or the absence of a yarn (core C or yarn Y) is detected by at least one of the core yarn detection device 90, the yarn monitoring device 8, and the tension sensor 9, a control signal for interrupting the supply of the core yarn C is sent from the unit controller 10 to the relay substrate 56, and the supply of the core yarn C is interrupted. Specifically, the first electromagnetic valve 58 is opened, and the clamping portion 106 of the core yarn delivery portion 100 is switched to the clamping state. The cutter of the core yarn delivery portion 100 operates in conjunction with this, and the core yarn C located downstream of the clamping portion 106 in the core yarn running direction is cut. The tension applying portion 70 is switched to the tension non-applying state, the slack ensuring portion 80 is switched to the slack ensuring state, and the clamping device 110 is switched to the clamping state. As a result, the tension applied to the core yarn C is released, and the slack of the core yarn C is ensured. In addition, when the spinning by the spinning unit 2 is normally completed, a control signal for ending the supply of the core yarn C is sent from the unit controller 10 to the relay substrate 56, and the same operation as above is performed.

[0081] When the supply of the core yarn C starts, the first electromagnetic valve 58 is closed, the clamping part 106 is switched to the non-clamping state, the tension applying part 70 is switched to the tension applying state, the clamping device 110 is switched to the non-clamping state, and the slack ensuring part 80 is switched to the slack non-ensuring state. The second electromagnetic valve 59 is opened, and the slack core yarn C ensured by the slack ensuring part 80 is sent out from the core yarn delivery part 100 to the drafting device 6. Thus, the supply of the core yarn C starts. The clamping device 110 is switched from the return prevention state to the release state when the core yarn delivery part 100 starts to deliver the core yarn C. In addition, by adjusting the delivery time of the core yarn C, etc., the clamping device 110 may be switched from the return prevention state to the release state just after the core yarn delivery part 100 starts to deliver the core yarn C. "Just after the core yarn C starts to be delivered" refers to a certain time after the core yarn C starts to be delivered and until the slack ensuring part of the core yarn C disappears and the core yarn C is arranged on the normal yarn path.

[0082] The core yarn delivery unit 100 delivers the elastic core yarn C toward the position between the middle roller pair 16 and the front roller pair 17. The drafting device 6 and the air spinning device 7 generate the yarn Y containing the core yarn C. In normal spinning, the core yarn delivery unit 100 does not operate. The core yarn C is continuously supplied by the rotation drive of the front roller pair 17.

[0083] Alternatively, in the core wire supply device 200, the path length of the slack ensuring portion of the core wire C may be adjusted according to the size (degree) of the elasticity of the core wire C. Figure 8As shown in the figure, by rotating and retracting the adjustment part 85, the path of the core wire C can be changed so that the core wire C does not pass through the second engagement hole 84a but only passes through the first engagement hole 83a. The adjustment part 85 can change the path length of the slack ensuring part of the core wire C. "The path length of the slack ensuring part of the core wire C" refers to the difference between the path length of the core wire C in the slack ensuring state and the path length of the core wire C in the slack non-ensured state (the length of the normal yarn path). "The path length of the slack ensuring part of the core wire C" can also be renamed as the slack ensuring amount (or slack giving amount). In addition, the slack ensuring amount can also be adjusted by adjusting the displacement of the cylinder 82 and the rotation amount (lifting amount) of the arm 81. In this case, the cylinder 82 corresponds to the adjustment part. The greater the elasticity of the core wire C, the more the adjustment part increases the slack ensuring amount. The smaller the elasticity of the core wire C, the more the adjustment part reduces the slack ensuring amount.

[0084] Alternatively, the core wire delivery unit 100 adjusts the delivery force according to the path length of the slack ensuring portion of the core wire C. The delivery force of the core wire delivery unit 100 may be adjusted by adjusting the pressure of the supplied air, or by adjusting the air supply time (opening time of the second solenoid valve 59). The longer the path length of the slack ensuring portion of the core wire C, the more the core wire delivery unit 100 increases the delivery force. The shorter the path length of the slack ensuring portion of the core wire C, the more the core wire delivery unit 100 weakens the delivery force.

[0085] The path length of the relaxation ensuring portion of the core wire C may be, for example, more than 1 times and less than 3 times the distance from the clamping portion 106 of the core wire delivery portion 100 to the upper roller of the front roller pair 17. If the path length of the relaxation ensuring portion is shorter than 1 times the above distance, the core wire C delivered by the core wire delivery portion 100 may not reach the drawing device 6. If the path length of the relaxation ensuring portion is longer than 3 times the above distance, the core wire C may get entangled with surrounding components when it is delivered by the core wire delivery portion 100. The reference of the above distance, i.e., the starting point and the end point, will be described in more detail. The starting point of the above distance is the downstream end point of the area (clamping surface) that clamps the core wire C in the clamping portion 106. The end point of the above distance is the clamping point of the front roller pair 17.

[0086] According to the core yarn supply device 200, the spinning machine 1 and the spinning method of the present embodiment, a package P with very few joints can be formed. Fig.9A As shown, in the present embodiment, the intervals between the plurality of joints included in the yarn Y in the package P are longer than the interval L between the periodic joints generated by the bobbin replacement. Fig. 9B In FIG. 1 , the interval L of the periodic joints Z generated by the bobbin replacement is shown for the package PX of the reference mode. That is, the package P does not include a joint in the period L corresponding to the joint formed by the bobbin replacement. Fig.9A In the example shown, the number of joints in the package P is small, so no joints are shown. "Cop replacement" is an action performed in the process of winding the cop (spinning tube) wound in the ring spinning frame back onto the package by the automatic winder, and is an action of replacing the next cop after winding back one cop. The end of one cop and the beginning of the next cop are connected by the yarn splicing device of the automatic winder, and as a result, a joint is generated. During the formation of one package by the automatic winder, multiple (many) cops are wound back, and therefore, the number of joints contained in the package formed by the automatic winder is greater than that in the present embodiment.

[0087] In the present embodiment, the package P does not have a splice caused by the replacement of the core yarn package CP, but it may include such a splice. In the case of including such a splice, the total length of the core yarn C wound on one core yarn package CP is usually greater than the total length of one bobbin. Therefore, even if the splice caused by the replacement of the core yarn package CP is included, the number of such splices is small.

[0088] According to the core wire supply device 200 of the present embodiment, the clamping device 110 (return prevention portion) provided at a position upstream of the slack securing portion 80 in the core wire running direction prevents the slack securing portion of the core wire C from returning upstream. Therefore, even when the core wire C having elasticity is used, the core wire delivery portion 100 can realize an appropriate delivery distance of the core wire. Thus, the core wire C can be properly delivered to the drafting device 6.

[0089] When or after the core wire delivery unit 100 starts to deliver the core wire C, the clamping device 110 (return prevention unit) switches from the return prevention state to the release state. Thus, when the core wire C is delivered, the slack portion of the core wire C can be reliably prevented from returning upstream.

[0090] The clamping device 110 as the return preventing portion physically clamps the core wire C, and thus can prevent the core wire C from returning upstream.

[0091] Since the core wire supplying device 200 includes the tension applying portion 70 , the core wire C can be appropriately supplied.

[0092] In the layout of the above-described embodiment, the distance between the slack ensuring portion 80 and the clamping device 110 is shortened, and the propagation of the contraction of the core wire C is reduced. As a result, it is possible to avoid a reduction in the slack amount.

[0093] By bending the core wire C in an M-shape using the slack ensuring portion 80 , a large slack can be ensured in a small space.

[0094] By adjusting the path length of the slack ensuring portion according to the elasticity of the core thread C by the adjusting portion 85 or the like, the core thread C can be appropriately fed to the drafting device 6 regardless of the type of the core thread C.

[0095] By changing the feeding force of the core wire feeding portion 100 according to the elasticity of the core wire C, the core wire C can be appropriately fed to the draft device 6 regardless of the type of the core wire C.

[0096] According to the spinning machine 1 of the present embodiment, the core yarn C can be appropriately fed to the drafting device 6 by the above-mentioned operation. The yarn Y including the elastic core yarn C can be appropriately produced and formed into the package P.

[0097] The path length of the slack ensuring portion of the core wire C formed by the slack ensuring portion 80 is more than 1 time and less than 3 times the distance from the clamping portion 106 of the core wire delivery portion 100 to the top roller of the front roller pair 17. Thus, the core wire C delivered by the core wire delivery portion 100 reliably reaches the front roller pair 17.

[0098] Although one embodiment of the present disclosure has been described above, the present invention is not limited to the above embodiment. The above embodiment and the following modified examples may be combined as appropriate.

[0099] For example, the tension applying section 70 may also function as a return preventing section by applying tension to the core yarn C when the slack ensuring section 80 ensures slack (i.e., during the period when the supply of the core yarn C is stopped). In this case, the magnitude of the tension applied to the core yarn C by the tension applying section 70 may be different from the magnitude of the tension applied in normal spinning. Alternatively, unlike the above-mentioned embodiment, the air system of the tension applying section 70 may be a different system separate from the core yarn delivery section 100 and the slack ensuring section 80. Alternatively, the tension applying section 70 may be changed to a structure in which the movable piece 74 is closed by the supply of air. According to this structure, the tension applying section 70 applies tension to the core yarn C during the supply of the core yarn C, and prevents the slack ensuring section from returning before the core yarn C is delivered (i.e., during the period when the supply of the core yarn C is stopped). The tension applying section 70 has two functions, and therefore, the clamping device 110 of the above-mentioned embodiment may be omitted.

[0100] In the above-mentioned embodiment, a mode in which the slack ensuring portion 80 has an arm 81 rotatably mounted on the unit base 60 (base portion) is described as an example. However, a slack ensuring portion having an arm movably mounted on the base portion may also be applied. In this case, there is no support shaft 81c. The arm may also be configured so that the entire arm approaches and moves away from the base portion (translational motion). Alternatively, a moving mechanism (driving portion) for moving the arm may be provided separately from the cylinder 82. One or two core wire passing portions formed on the arm move away from the guide portion 120 and the clamping device 110 when the arm is configured in the slack ensuring position. At this time, the core wire C is bent multiple times.

[0101] In the above embodiment, the mode in which the adjustment portion 85 is provided in the slack ensuring portion 80 is described as an example. However, the adjustment portion 85 may be omitted. Alternatively, the first protruding piece 83 having the first engaging hole 83a and the second protruding piece 84 having the second engaging hole 84a may be integrally formed at the terminal end portion 81b of the arm body 81a. In other words, two core wire passing portions may be integrally formed on the arm 81, and the path length of the slack ensuring portion may be determined by the arrangement of the two core wire passing portions.

[0102] The two core wire passage portions are not limited to circular holes, but may be oval or polygonal holes, or may be notched (V-shaped) with which the core wire C can be engaged.

[0103] The tension applying portion 70 may be omitted. The arrangement of the clamping device 110 is not limited to between the tension applying portion 70 and the slack ensuring portion 80, and may be changed as appropriate.

[0104] The slack ensuring portion 80 may also be referred to by other names. After the slack ensuring portion 80 is actuated, the core wire C is relaxed compared to before the slack ensuring portion 80 is actuated. However, the degree of relaxation of the core wire C may differ depending on the core wire C. The slack ensuring portion 80 may also be referred to as a "core wire detour portion" or a "path detour portion" based on, for example, the meaning of making the core wire C detour. The slack ensuring portion 80 may also be referred to as a "holding length enlargement portion" based on, for example, the meaning of enlarging the holding length of the core wire C. The slack ensuring portion 80 may also be referred to as a "core wire path moving portion" based on, for example, the meaning of moving the path of the core wire C.

[0105] In the above-mentioned embodiment, a mode in which the drafting device 6 includes the rear roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17 is described as an example. However, it is also possible that one or more roller pairs are provided upstream of the rear roller pair 14. In addition, it is also possible that the front roller pair (a roller pair arranged at a position closest to the air spinning device 7 on the conveying path of the fiber bundle F) is configured as a part of other devices. For example, it is also possible that the spinning unit 2 includes a supply device that supplies the fiber bundle F drafted by the drafting device 6 to the air spinning device 7, and the front roller pair 17 is included in a part of the supply device. The front roller pair 17 may be included in the drafting device 6 that drafts the fiber bundle S or the supply device that supplies the fiber bundle F to the air spinning device 7, or it may not be included in other devices but be provided separately.

[0106] In the spinning unit 2, the yarn accumulating device 11 has a function of pulling out the yarn Y from the air spinning device 7, but the yarn Y may be pulled out from the air spinning device 7 by using a delivery roller and a clamping roller. When the yarn Y is pulled out from the air spinning device 7 by using a delivery roller and a clamping roller, a relaxation tube using a suction air flow may be provided instead of the yarn accumulating device 11, or a relaxation tube using a suction air flow may be provided in addition to the yarn accumulating device 11. A mechanical compensator or the like may be provided instead of the relaxation tube, or a mechanical compensator or the like may be provided in addition to the relaxation tube.

[0107] Alternatively, in the spinning unit 2, instead of connecting the two yarn ends via the yarn joining device 26, the yarn Y from the package P is connected (spliced) with the yarn Y of the package P by inserting the yarn Y from the package P into the air spinning device 7 and starting the stretching action of the stretching device 6 and the spinning action of the air spinning device 7.

[0108] In the spinning machine 1, the devices are arranged so that the yarn Y supplied from the upper side is wound on the lower side in the height direction of the machine. However, the devices may be arranged so that the yarn supplied from the lower side is wound on the upper side.

[0109] In the spinning machine 1, at least one roller of the lower roller of the drafting device 6 and the traverse guide 23 are driven by the power from the second end frame 5 (i.e., shared by a plurality of spinning units 2). However, each part of the spinning unit 2 (e.g., the drafting device 6, the air spinning device 7, or the winding device 13, etc.) may be driven independently for each spinning unit 2.

[0110] Alternatively, the tension sensor 9 may be arranged upstream of the yarn monitoring device 8 in the traveling direction of the yarn Y. Alternatively, the unit controller 10 may be provided for each spinning unit 2. In the spinning unit 2, at least one of the waxing device 12, the tension sensor 9, and the yarn monitoring device 8 may be omitted. Alternatively, when the yarn Y is not waxed, the waxing device 12 may not be omitted, and only the wax may be removed from the waxing device 12.

[0111] Figure 1 In the figure, the spinning machine 1 is shown to wind a bobbin-shaped package P, but it is also possible to wind a conical package. In the case of a conical package, the slack of the yarn Y occurs due to the traversal of the yarn Y, but this slack can be absorbed by the yarn accumulation device 11. The materials and shapes of each structure are not limited to the above-mentioned materials and shapes, and various materials and shapes can be used.

Claims

1. A core wire supply device, characterized in that: have: a core wire bobbin holding portion for holding the core wire bobbin wound with the core wire; A core wire delivery unit that delivers the core wire; a slack securing portion which is provided between the core wire bobbin holding portion and the core wire feeding portion in the traveling direction of the core wire and secures slack of the core wire; and A return preventing portion is provided between the core wire bobbin holding portion and the slack ensuring portion in the traveling direction and prevents the slack ensuring portion of the core wire, which has been slack ensured by the slack ensuring portion, from returning in a direction opposite to the traveling direction.

2. The core wire supply device according to claim 1, characterized in that: The return preventing portion is switchable between a return preventing state for preventing the slack securing portion of the core wire from returning and a release state for freeing the slack securing portion of the core wire. When the core wire feeding portion starts feeding out the core wire or immediately after the core wire is fed out, the return preventing portion switches from the return preventing state to the released state.

3. The core wire supply device according to claim 1 or 2, characterized in that: The return preventing portion is a clamping device that clamps the core wire.

4. The core wire supply device according to claim 1 or 2, characterized in that: A tension applying portion is further provided, the tension applying portion being provided between the core wire bobbin holding portion and the core wire feeding portion in the traveling direction and applying tension to the core wire during supply of the core wire.

5. The core wire supply device according to claim 3, characterized in that: A tension applying portion is further provided, the tension applying portion being provided between the core wire bobbin holding portion and the core wire feeding portion in the traveling direction and applying tension to the core wire during supply of the core wire.

6. The core wire supply device according to claim 5, characterized in that: The clamping device is arranged between the tension applying portion and the slack ensuring portion in the traveling direction.

7. The core wire supply device according to claim 4, characterized in that: The tension applying portion functions as the return preventing portion by applying tension to the core wire during a period in which supply of the core wire is stopped.

8. The core wire supply device according to any one of claims 1 to 7, characterized in that: further comprising a base portion supporting the slack ensuring portion, At least one yarn path guide is fixed to the base portion, and the at least one yarn path guide guides the core wire so that the core wire runs on a straight regular yarn path during the supply of the core wire. The slack ensuring portion has: an arm movably mounted on the base portion and formed with two core wire passing portions; and a driving portion which causes the arm to move, When the arm is arranged at the normal position, the yarn path guide and the two core thread passing parts are arranged on the normal yarn path. In a state where the arm is arranged at the slack ensuring position, the core wire is guided so as to be bent at least four times.

9. The core wire supply device according to any one of claims 1 to 8, characterized in that: The slack ensuring portion is provided with an adjusting portion capable of adjusting a path length of the slack ensuring portion of the core wire.

10. The core wire supply device according to any one of claims 1 to 9, characterized in that: The core wire feeding section changes a feeding force according to a path length of the slack ensuring portion of the core wire.

11. An air spinning machine, characterized in that: have: The core wire supply device according to any one of claims 1 to 10; A drafting device, which drafts the fiber bundle; an air-jet spinning device for spinning the fiber bundle drafted by the drafting device using the core yarn supplied from the core yarn supplying device as a core, thereby generating a yarn including the core yarn; and a winding device for winding the yarn into a package, The core yarn delivery section of the core yarn supply device is provided to face a position between the middle roller pair and the front roller pair of the drafting device.

12. The air spinning machine according to claim 11, characterized in that: The length of the slack ensuring portion of the core wire formed by the slack ensuring portion is not less than 1 time and not more than 3 times the distance from the clamping portion in the core wire feeding portion to the top roller of the front roller pair.

13. A spinning method, which is a spinning method using an air spinning machine, The air spinning machine comprises: A core wire supply device, comprising a core wire tube holding portion for holding a core wire tube wound with a core wire, a core wire delivery portion for delivering the core wire, a slack ensuring portion provided between the core wire tube holding portion and the core wire delivery portion in a direction of travel of the core wire and ensuring slack of the core wire, and a return preventing portion provided between the core wire tube holding portion and the slack ensuring portion in the direction of travel and preventing a slack ensuring portion of the core wire, which has been slack ensured by the slack ensuring portion, from returning in a direction opposite to the direction of travel; a drafting device for drafting the fiber bundle; and an air jet spinning device that uses the core yarn supplied from the core yarn supply device as a core and spins the fiber bundle drafted by the drafting device to generate a yarn containing the core yarn, The spinning method is characterized in that In the air spinning machine, The stretchable core yarn is fed out from the core yarn feeding section which is arranged to face the position between the middle roller pair and the front roller pair of the drafting device. The yarn containing the core yarn is produced by an air-jet spinning device.

14. A package wound with a yarn including a stretchable core yarn produced by air jet spinning, characterized in that: The intervals between the plurality of joints included in the yarn are longer than the intervals between periodic joints generated by replacing the bobbin, and the yarn does not have a joint generated by replacing the core yarn.

15. The package according to claim 14, characterized in that The core wire is composed of two polymers and has a stretching elongation of more than 50%.

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