CN105525401B

CN105525401B - Core yarn supply device and spinning machine

Info

Publication number: CN105525401B
Application number: CN201510611796.9A
Authority: CN
Inventors: 秋元理宏; 泽田晴稔
Original assignee: Murata Machinery Ltd
Current assignee: Murata Machinery Ltd
Priority date: 2014-10-21
Filing date: 2015-09-23
Publication date: 2021-06-22
Anticipated expiration: 2035-09-23
Also published as: JP2016079540A; CN105525401A

Abstract

The invention provides a core yarn supply device and a spinning machine. The core yarn supply device (7) is a core yarn supply device (7) for supplying a core yarn (C), and is provided with a tension applying section (71) for applying tension to the core yarn (C). The tension applying section (71) causes the tension applied to the core yarn (C) when the supply of the core yarn (C) is stopped to be smaller than the tension applied to the core yarn (C) when the core yarn (C) is supplied.

Description

Core yarn supply device and spinning machine

Technical Field

The invention relates to a core yarn supply device and a spinning machine.

Background

As a conventional core yarn feeding device, for example, a device described in japanese patent laid-open No. 2012-131591 is known. The core yarn feeding device described in japanese patent application laid-open No. 2012-131591 includes a tension applying section that applies tension to the core yarn when the core yarn is fed to the draft device.

In the core yarn supplying device, the tension applying section applies tension to the core yarn even when the supply of the core yarn to the draft device is stopped. In this case, the core yarn may be in a defective state due to the application of tension. If a trouble occurs in the core yarn, there is a possibility that an error occurs in the supply of the core yarn to the draft device when the supply of the core yarn is started (restarted).

Disclosure of Invention

The invention aims to provide a core yarn supply device and a spinning machine capable of inhibiting the supply error of core yarns.

The core yarn feeding device of the invention is a core yarn feeding device for feeding core yarns, and is provided with a tension applying part for applying tension to the core yarns, and an outlet part arranged at the downstream of the tension applying part in the feeding direction of the core yarns; the tension applying section is configured to apply a smaller tension to the core yarn when the supply of the core yarn from the outlet section to the downstream side is stopped than when the supply of the core yarn from the outlet section to the downstream side is performed.

With this configuration, when the supply of the core yarn is stopped, the application of the tension to the core yarn by the tension applying portion is suppressed. This can suppress the occurrence of a trouble in the core yarn due to the application of tension to the core yarn. As a result, a feeding error of the core yarn can be suppressed.

The core yarn feeding device of the invention is a core yarn feeding device for feeding a core yarn, and is provided with a tension applying part for bending the core yarn and applying tension to the core yarn, and an outlet part arranged at the downstream of the tension applying part in the feeding direction of the core yarn; the tension applying section is configured to make a degree of bending of the core yarn smaller when the supply of the core yarn from the outlet section to the downstream side is stopped than when the supply of the core yarn from the outlet section to the downstream side is performed.

In one embodiment, the tension applying portion may act on the core yarn as follows: when the supply of the core yarn from the outlet part to the downstream side is stopped, the core yarn passing through the tension applying part is in a straight line shape; when the core yarn is fed from the outlet portion to the downstream side, the core yarn passing through the tension applying portion is bent.

In one embodiment, the tension applying part is switched to a tension applying state for applying tension to the core yarn and a non-tension applying state for not applying tension to the core yarn, and is kept in the tension applying state when the core yarn is supplied from the outlet part to the downstream side; when the supply of the core yarn from the outlet portion to the downstream side is stopped, the tension is kept in a non-applied state. With this configuration, when the supply of the core yarn is stopped, the application of the tension to the core yarn by the tension applying section can be released.

In one embodiment, the core yarn supplying device may include a slack applying section for applying slack to the core yarn on a downstream side of the tension applying section in a supplying direction of the core yarn, the slack applying section may be switched between a slack applying state for applying slack to the core yarn and a non-slack applying state in which no slack is applied to the core yarn, and the tension applying section may be switched to the non-tension applying state and held in the non-tension applying state before or while the slack applying section is switched to the slack applying state. With this configuration, when the supply of the core yarn is stopped, the core yarn is suppressed from being dragged by both the slack applying portion and the tension applying portion. This can suppress the occurrence of defects in the core yarn.

In one embodiment, the core yarn feeding device may include a clamping portion that clamps the core yarn on a downstream side in the feeding direction from the slack applying portion, the clamping portion may be switched between a clamped state in which the core yarn is clamped and a non-clamped state in which the core yarn is not clamped, and when the clamping portion is held in the clamped state and the feeding of the core yarn from the outlet portion to the downstream side is stopped, the slack applying portion may be held in the slack applying state and the tension applying portion may be held in the non-tension applying state. With this configuration, the core yarn is prevented from being pulled by the nip portion, the slack applying portion, and the tension applying portion.

In one embodiment, the tension applying section is switched to the tension applying state and held in the tension applying state after the slack applying section is switched to the slack applying state and the clamping section is switched to the non-clamping state. With this configuration, when the supply of the core yarn is started (restarted), the application of the tension to the core yarn by the tension applying section is suppressed. Thus, when the supply of the core yarn is started (restarted), the supply of the core yarn can be easily performed.

In one embodiment, the core yarn supplying device may include a package support portion for supporting a core yarn package in which the core yarn is wound, and the tension applying portion and the package support portion may be arranged such that there is no mechanism for restraining the core yarn. With this configuration, when the supply of the core yarn is stopped, the application of the tension to the core yarn is further suppressed.

In one embodiment, the tension applying portion may have a bending portion for bending the core yarn a plurality of times to apply tension to the core yarn. Depending on the kind of the core yarn, if the core yarn rubs against the bend, the core yarn may be electrostatically charged. This may cause a change in the movement of the core yarn, thereby causing a feed error of the core yarn. With this configuration, when the supply of the core yarn is stopped, the application of the tension to the core yarn by the bending portion is suppressed. Therefore, since the core yarn is suppressed from rubbing against the bent portion, electrostatic charging to the core yarn is also suppressed.

The spinning machine of the present invention comprises: the core yarn supplying device, the draft device for drafting the fiber bundle, the air spinning device for twisting the fiber bundle with the core yarn as a core to generate a yarn, and the winding device for winding the yarn; the tension applying section is configured to apply a lower tension to the core yarn when the supply of the core yarn to the air-jet spinning device is stopped than when the core yarn is supplied to the air-jet spinning device.

With this configuration, when the supply of the core yarn to the air-jet spinning device is stopped, the application of the tension to the core yarn by the tension applying section is suppressed. This can suppress the occurrence of a trouble in the core yarn due to the application of tension. As a result, a feeding error of the core yarn to the air-jet spinning device can be suppressed.

In one embodiment, the draft device may have a plurality of roller pairs, the core yarn supply device may be arranged to supply the core yarn between 2 adjacent roller pairs of the plurality of roller pairs, the core yarn supply device may hold a yarn end of the core yarn positioned in the core yarn supply device when the supply of the core yarn to the air-jet spinning device is stopped, and the draft device may supply the core yarn supplied from the core yarn supply device to the air-jet spinning device together with the fiber bundle when the core yarn is supplied to the air-jet spinning device.

Drawings

FIG. 1 is a front view of a spinning machine according to an embodiment of the present invention;

FIG. 2 is a side view of a spinning unit in the spinning machine of FIG. 1;

fig. 3 is a perspective view of a core yarn feeding device in the spinning unit of fig. 2;

fig. 4A and 4B are side views of a tension applying mechanism in the core yarn feeding device of fig. 3;

FIG. 5 is a partial sectional view of a core yarn feeding mechanism in the core yarn feeding device of FIG. 3;

fig. 6A and 6B are partial sectional views of the periphery of the grip portion;

FIG. 7 is a view showing a core yarn supplying apparatus for supplying a core yarn;

fig. 8 is a diagram showing the core yarn feeding device when the core yarn feeding is stopped.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the drawings. In the description of the drawings, the same or corresponding portions are denoted by the same reference numerals, and redundant description is omitted.

As shown in fig. 1, the spinning machine 1 includes a plurality of spinning units 2, a yarn splicing cart 3, a 1 st end frame 4, and a 2 nd end frame 5. The plurality of spinning units 2 are arranged in a row. Each spinning unit 2 generates a spun yarn (yarn) Y, and winds the spun yarn Y around a bobbin B to form a package P. When the spun yarn Y is cut in a certain spinning unit 2 or the spun yarn Y is broken for some reason, the yarn splicing cart 3 performs yarn splicing operation in the spinning unit 2. The 1 st end frame 4 houses an air supply source for generating air whirling flow or the like in each part of the spinning unit 2, a suction source for generating suction flow in each part of the spinning unit 2, and the like.

The 2 nd end frame 5 houses a drive motor and the like for powering each part of the spinning unit 2. The 2 nd end frame 5 is provided with a body control device E, a display portion D, and an input key K. The body control device E centrally manages and controls the respective parts of the spinning machine 1. The display unit D can display information on the setting content and/or the state of the spinning unit 2. The operator can perform the setting operation of the spinning unit 2 by performing an appropriate operation using the input key K.

In the following description, the side of the running path of the sliver S, the fiber bundle F, and the spun yarn Y on which the sliver S is supplied is referred to as an "upstream side", and the side on which the spun yarn Y is wound is referred to as a "downstream side". The side of the yarn Y traveling on the yarn splicing cart 3 is referred to as "front side", and the opposite side is referred to as "rear side". In the present embodiment, a working path (not shown) extending in the arrangement direction of the plurality of spinning units 2 is provided on the front side of the spinning machine 1. The operator can perform operations, monitoring, and the like of each spinning unit 2 from the operation path.

As shown in fig. 1 and 2, each spinning unit 2 includes, in order from the upstream side: a draft device 6, a core yarn feeding device 7, an air spinning device 8, a spun yarn monitoring device 9, a tension sensor 10, a yarn accumulating device 11, a wax feeding device 12, and a winding device 13. These devices directly or indirectly support the upstream side with the body frame so that the upstream side is the upper side in the body height direction (that is, the downstream side is the lower side in the body height direction).

The unit controller 15 is provided for every predetermined number of the spinning units 2, and controls the operation of the spinning units 2. The unit controller 15 controls the operation of the spinning unit 2 based on information (signal) output from the body control device E.

The draft device 6 drafts the sliver S. The draft device 6 includes a rear roller pair 16, a third roller pair 17, an intermediate roller pair 18, and a front roller pair 19 in this order from the upstream side in the running direction of the sliver S. Each

roller pair

16, 17, 18, 19 has a bottom roller and a top roller. The bottom roller is rotationally driven by a drive motor provided on the 2 nd end frame 5 or a drive motor provided in each spinning unit 2. A belt 18a is provided to the top roller of the intermediate roller pair 18. A belt 18b is provided to the bottom roller of the intermediate roller pair 18.

The core yarn supply device 7 unwinds the core yarn C from the core yarn package CP and supplies the core yarn C to the draft device 6. Specifically, the core yarn feeder 7 feeds the core yarn C onto the running path of the fiber bundle F from between the intermediate roller pair 18 and the front roller pair 19 (between the adjacent 2 roller pairs). Thereby, the core yarn C is supplied to the air-jet spinning device 8 together with the fiber bundle F.

The air-jet spinning device 8 generates a spun yarn Y by twisting the fiber bundle F drafted by the draft device 6 with the core yarn C as a core by a twist circulation of air. The spun yarn monitoring device 9 monitors information of the running spun yarn Y between the air-jet spinning device 8 and the yarn accumulating device 11, and detects the presence or absence of a yarn defect based on the monitored information. When detecting a yarn defect, the spun yarn monitoring device 9 transmits a yarn defect detection signal to the unit controller 15. The spun yarn monitoring device 9 detects, for example, a yarn defect, such as a thickness abnormality of the spun yarn Y and/or a foreign substance contained in the spun yarn Y. The spun yarn monitoring device 9 also detects yarn breakage and the like.

The tension sensor 10 measures the tension of the traveling spun yarn Y between the air-jet spinning device 8 and the yarn accumulating device 11, and transmits a tension measurement signal to the unit controller 15. When it is determined that the unit controller 15 is abnormal based on the detection result of the spun yarn monitoring device 9 and/or the tension sensor 10, the spun yarn Y is cut in the spinning unit 2. Specifically, the supply of air to the air-jet spinning device 8 is stopped to interrupt the generation of the spun yarn Y, thereby cutting the spun yarn Y. Alternatively, the spun yarn Y may be cut by a cutter provided separately.

The wax feeder 12 feeds wax to the spun yarn Y between the yarn accumulating device 11 and the winding device 13.

The yarn accumulating device 11 removes slack of the spun yarn Y between the air-jet spinning device 8 and the winding device 13. The yarn accumulating device 11 has a function of stably drawing out the spun yarn Y from the air-jet spinning device 8, a function of preventing the spun yarn Y fed out from the air-jet spinning device 8 from being accumulated and loosened when the yarn splicing cart 3 performs a yarn splicing operation or the like, and a function of preventing tension fluctuation of the spun yarn Y on the downstream side of the yarn accumulating device 11 from being transmitted to the air-jet spinning device 8.

The winding device 13 winds the spun yarn Y 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 rotatably supports the bobbin B. The swing arm 21 is swingably supported by a support shaft 24, and the surface of the bobbin B or the surface of the package P is brought into contact with the surface of the winding drum 22 with an appropriate pressure. A driving motor (not shown) provided in the 2 nd end frame 5 simultaneously drives the take-up drums 22 of the plurality of spinning units 2. Thereby, 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 rotary shaft 25 common to the plurality of spinning units 2. The traverse guide 23 traverses the spun yarn Y by a predetermined width with respect to the rotating bobbin B or package P by reciprocally driving the rotating shaft 25 in the rotating shaft direction of the winding drum 22 by the driving motor of the 2 nd end frame 5.

When the spun yarn Y is cut in a certain spinning unit 2 or the spun yarn Y is broken for some reason, the yarn splicing cart 3 travels to the spinning unit 2 and performs a yarn splicing operation. The joint trolley 3 has a joint device 26, a suction pipe 27 and a suction nozzle 28. The suction pipe 27 is rotatably supported by a support shaft 27a, and captures the spun yarn Y from the air-jet spinning device 8 and guides the spun yarn Y to the yarn splicing device 26. The suction nozzle 28 is rotatably supported by a support shaft 28a, and captures the spun yarn Y from the winding device 13 and guides the spun yarn Y to the yarn splicing device 26. The yarn splicing device 26 splices the guided spun yarns Y. The yarn splicing device 26 is a yarn splicing device using air, a warp splicer using a seed yarn, a knotter mechanically splicing the spun yarn Y, or the like.

Next, the core yarn supplying device 7 will be described in detail. As shown in fig. 2, the core yarn supply device 7 includes a package support portion 50, a core yarn supply unit 51, and a core yarn guide portion 52.

The package support portion 50 holds the core yarn package CP in a state where the center line of the core yarn package CP is horizontal and extends in the front-rear direction. The core yarn package CP is formed by winding the core yarn C around a core yarn bobbin CB. In the present embodiment, the multifilament yarn is used as the core yarn C. Multifilament yarns are yarns formed by bundling a plurality of filament singles yarns. The core yarn C is unwound from the core yarn package CP and supplied to the core yarn supply unit 51 through a yarn guide roller 53 that guides the core yarn C.

The core yarn supply unit 51 has a function of applying tension to the supplied core yarn C, a function of applying slack to the core yarn C, and a function of feeding out the core yarn C (yarn end of the core yarn C). The core yarn guide 52 is a tubular member that guides the core yarn C from the core yarn supply unit 51 to the draft device 6.

As shown in fig. 3, the core yarn supply unit 51 includes a unit base 60, a tension applying mechanism 70, a slack applying mechanism 80, a core yarn monitoring device 90, and a core yarn feeding mechanism (outlet portion) 100. In the following description, on the running path of the core yarn C in the core yarn supply unit 51, the core yarn package CP side is referred to as the upstream side, and the core yarn guide portion 52 side is referred to as the downstream side.

The unit holder 60 supports a tension applying mechanism 70, a slack applying mechanism 80, a core yarn monitoring device 90, and a core yarn feeding mechanism 100, which are arranged in this order from the upstream side in the feeding direction of the core yarn C. A core yarn guide 61 for guiding the core yarn C is provided on the most upstream side of the unit holder 60.

The tension applying mechanism 70 applies tension to the core yarn C on the downstream side of the core yarn carrier 61 in the feeding direction of the core yarn C. As shown in fig. 4A, the tension applying mechanism 70 includes a tension applying portion 71 and a holding portion 72.

As shown in fig. 4A, the tension applying portion 71 includes a fixed piece (bent portion) 73 and a movable piece (bent portion) 74. The tension applying portion 71 alternately hooks the core yarn C to the fixed piece 73 and the movable piece 74 to bend the core yarn C a plurality of times. The number of times the core yarn C is bent is, for example, 20 times or less (preferably 2 to 10 times).

The fixing piece 73 is fixed to the unit holder 60. The movable piece 74 is supported by a support shaft (not shown) provided on the fixed piece 73, and is openable (rotatable) with respect to the fixed piece 73. The movable piece 74 is biased in a direction of opening with respect to the fixed piece 73 by a spring (not shown) provided on the fixed piece 73.

As a more specific configuration, a plurality of rotating shafts 73a are provided at predetermined intervals in the feeding direction of the core yarn C on the fixing piece 73. The movable piece 74 is provided with a plurality of projections 74a projecting toward the fixed piece 73. When the movable piece 74 is closed with respect to the fixed piece 73 (the state shown in fig. 4B), the projections 74a are located at positions alternating with the rotation shafts 73a in the feeding direction of the core yarn C. A hole 74b through which the core yarn C passes is formed in a tip portion of each projection 74 a. The core yarn C is alternately hung on the respective rotating shafts 73a and the respective holes 74 b.

As shown in fig. 4A, when the movable piece 74 is opened with respect to the fixed piece 73, the core yarn C is bent a plurality of times. This applies resistance to, for example, the running core yarn C, and applies tension to the core yarn C. The state of the tension applying portion 71 at this time is referred to as a tension applying state. As shown in fig. 4B, when the movable piece 74 is closed with respect to the fixed piece 73, the core yarn C becomes substantially linear (straight). Thereby, the core yarn C is not given tension. The state of the tension applying section 71 at this time is referred to as a non-tension applying state.

The holding portion 72 opens and closes the movable piece 74 with respect to the fixed piece 73. As shown in fig. 4A and 4B, the holding portion 72 has a holding member 75 and an air cylinder 76.

The holding member 75 is abutted against and separated from the movable piece 74 by the air cylinder 76. More specifically, the holding member 75 is provided with a distal end portion 75a that abuts against the movable piece 74 from the opposite side of the fixed piece 73. When air is supplied to the air cylinder 76, the tip portion 75a moves to the lower side (the direction in which the movable piece 74 and the fixed piece 73 close). When the supply of air to the air cylinder 76 is stopped, the distal end portion 75a moves upward away from the movable piece 74 (in the direction in which the movable piece 74 opens with respect to the fixed piece 73).

When the tip portion 75a moves downward, the movable piece 74 is pressed by the tip portion 75a and closes with the fixed piece 73. As a result, the tension applying section 71 is switched to the non-tension applying state. When the distal end portion 75a moves upward, the movable piece 74 is biased by the spring to open relative to the fixed piece 73. As a result, the tension applying section 71 is switched to the tension applying state.

The slack applying mechanism 80 applies slack to the core yarn C on the downstream side of the tension applying mechanism 70 in the feeding direction of the core yarn C. As shown in fig. 3, the slack applying mechanism 80 includes a slack applying portion 81 and a cylinder 82. The slack applying portion 81 is an arm rotatably supported by a support shaft 81 c. The support shaft 81c is mounted on the unit holder 60. The slack applying section 81 is rotated by the cylinder 82.

More specifically, a hole 83 through which the core yarn C passes is provided at the tip of the slack applying portion 81. The hole 83 moves to a position (position of the two-dot chain line in fig. 3) away from the running path of the core yarn C when the air is supplied to the air cylinder 82. When the supply of air to the air cylinder 82 is stopped, the hole 83 moves to the traveling path (the position of the solid line in fig. 3) of the core yarn C.

When the hole 83 moves from the running path of the core yarn C (the position of the solid line in fig. 3) to a position (the position of the two-dot chain line in fig. 3) apart from the running path of the core yarn C, the core yarn C is lifted up while being caught on the edge of the hole 83. Since the core yarn C is unwound from the core yarn package CP by the same amount as the amount of the core yarn C pulled out, the core yarn C is slackened. The state of the slack applying portion 81 when the hole 83 is located at a position away from the running path of the core yarn C (the state of the two-dot chain line in fig. 3) is referred to as a slack applying state. The state of the slack applying portion 81 when the hole 83 is located on the running path of the core yarn C (the solid line state in fig. 3) is referred to as a non-slack applying state.

The core yarn monitoring device 90 detects the presence or absence of the core yarn C on the downstream side of the slack applying mechanism 80 in the feeding direction of the core yarn C. A core yarn carrier 62 for guiding the core yarn C is disposed upstream of the core yarn monitoring device 90. A core yarn carrier 63 for guiding the core yarn C is disposed downstream of the core yarn monitoring device 90.

The core yarn feeding mechanism 100 is provided downstream of the core yarn monitoring device 90 in the feeding direction of the core yarn C. The core yarn feeding mechanism 100 feeds the core yarn C (yarn end of the core yarn C) to the draft device 6. As shown in fig. 5, the core yarn feeding mechanism 100 includes a core yarn feeding portion 101 and a clamp cutter 102.

The core yarn feeder 101 feeds the core yarn C to the draft device 6 by the action of air. The core yarn feeder 101 includes a core yarn feeding nozzle unit 103, a core yarn feeding nozzle 104, and a tubular body 105. The core yarn feeding nozzle 104 and the tubular body 105 are disposed inside the core yarn feeding nozzle unit 103, and constitute a running path for the core yarn C. The air is ejected from the outside through the nozzle 103a on the traveling path of the core yarn C. Thereby, the core yarn feeder 101 feeds the core yarn C located in the core yarn feeding nozzle 104 and the tubular body 105 to the draft device 6 by the injected air.

The "feeding of the core yarn C" refers to an operation in which the core yarn feeding section 101 feeds the core yarn C (yarn end of the core yarn C) to the draft device 6 when the supply of the core yarn C is started (restarted). The "supply of the core yarn C" refers to an operation in which the core yarn supply device 7 continuously supplies the core yarn C to the draft device 6 after the supply of the core yarn C is started (restarted) (i.e., an operation during the spinning of the spun yarn Y).

The clamp cutter 102 clamps and cuts the core yarn C on the downstream side of the core yarn feeding portion 101 in the feeding direction of the core yarn C. As shown in fig. 5, the clamp disconnector 102 has a clamping portion 106, a cutting portion 107, and a cylinder 108.

The clamping portion 106 clamps the core yarn C (yarn end of the core yarn C). The clamp 106 has a clamp pin 106a and a clamp block 106 b.

As shown in fig. 6A and 6B, the clamp block 106B is relatively moved with respect to the clamp pin 106A by the air cylinder 108. More specifically, when the supply of air to the air cylinder 108 is stopped, the clamp block 106b moves to the side opposite to the clamp pin 106A with respect to the traveling region of the core yarn C, and is separated from the clamp pin 106A (the state shown in fig. 6A). When air is supplied to the air cylinder 108, the clamp block 106B approaches the clamp pin 106a across the traveling region of the core yarn C (the state shown in fig. 6B). Thereby, the clamping portion 106 clamps the core yarn C. The state of the clamping portion 106 at this time (the state shown in fig. 6B) is referred to as a clamped state. The state of the clamp portion 106 when the clamp block 106b is separated from the clamp pin 106A (the state shown in fig. 6A) is referred to as a non-clamped state.

The cutting section 107 cuts the core yarn C on the downstream side of the nip 106 in the feeding direction of the core yarn C. The cutting unit 107 is operated by the air cylinder 108 in conjunction with the clamping unit 106. The cutting section 107 cuts the core yarn C when the clamping section 106 is switched from the non-clamped state to the clamped state.

As shown in fig. 3, the core yarn supply unit 51 further includes a 1 st air supply pipe 54, a 2 nd air supply pipe 55, a relay substrate 56, and a multicore wire 57.

The 1 st air supply pipe 54 is connected to an air supply pipe (not shown) connected to an air supply source of the 1 st end frame 4 and a plurality of pipes (not shown) connected to the

respective cylinders

76, 82, 108. Thus, air is supplied from the 1 st end bell 4 to each of the

cylinders

76, 82, 108 through the 1 st air supply tube 54.

A 1 st solenoid valve (not shown) is attached to the 1 st air supply pipe 54. The 1 st solenoid valve controls the supply and stop of air supplied from the 1 st end bell 4 to each of the

cylinders

76, 82, 108. When the 1 st solenoid valve is open, air is provided to each

cylinder

76, 82, 108. When the 1 st electromagnetic valve is closed, the supply of air to each of the

cylinders

76, 82, 108 is stopped.

When the 1 st solenoid valve is opened, the tension applying section 71 is switched to the non-tension applying state, the slack applying section 81 is switched to the slack applying state, and the clamping section 106 is switched to the clamping state. When the 1 st solenoid valve is closed, the tension applying section 71 is switched to the tension applying state, the slack applying section 81 is switched to the slack applying state, and the clamping section 106 is switched to the non-clamping state.

The timing of switching the states of the tension applying portion 71, the slack applying portion 81, and the clamping portion 106 is different from each other. That is, the time from the opening/closing of the 1 st solenoid valve to the start of the operation of each of the

cylinders

76, 82, 108 is different.

Specifically, when the 1 st solenoid valve is opened, the clamping portion 106 is first switched to the clamping state, then the tension applying portion 71 is switched to the non-tension applying state, and then the slack applying portion 81 is switched to the slack applying state. When the 1 st electromagnetic valve is closed, first, the clamping portion 106 is switched to the non-clamping state, then, the tension applying portion 71 is switched to the tension applying state, and then, the slack applying portion 81 is switched to the non-slack applying state. Such a configuration is achieved, for example, by providing a difference in the size (volume and/or length) of the respective pipes connected corresponding to the

respective cylinders

76, 82, 108.

The 2 nd air supply pipe 55 is connected to an air supply pipe (not shown) connected to the 1 st end frame 4 and the core yarn feeder 101. Thereby, air is supplied from the 1 st end frame 4 to the core yarn feeder 101 through the 2 nd air supply pipe 55. A 2 nd solenoid valve (not shown) is attached to the 2 nd air supply pipe 55. The 2 nd solenoid valve controls supply and stop of air supplied from the 1 st end frame 4 to the core yarn feeder 101. When the 2 nd electromagnetic valve is closed, the core yarn C is not fed from the core yarn feeding portion 101. When the 2 nd electromagnetic valve is opened, the core yarn C is fed from the core yarn feeding portion 101.

The relay board 56 is supported by the unit mount 60. The relay board 56 is electrically connected to the 1 st electromagnetic valve, the 2 nd electromagnetic valve, and the core yarn monitoring device 90 via a plurality of wires (not shown).

The multicore wire 57 connects the relay substrate 56 and a multicore wire (not shown) connected to the unit controller 15. Thereby, the unit controller 15 can control the 1 st solenoid valve, the 2 nd solenoid valve, and the core yarn monitoring device 90.

Next, the operation of the core yarn supplying device 7 will be described. First, the operation of the core yarn supplying device 7 when the core yarn C is supplied downstream from the core yarn feeding mechanism 100 (i.e., during spinning) will be described with reference to fig. 7.

When the core yarn C is supplied, the 1 st solenoid valve is closed. Therefore, the tension applying portion 71 is held in the tension applying state, the slack applying portion 81 is held in the slack applying state, and the clamping portion 106 is held in the non-clamping state. Thereby, the core yarn supplying device 7 supplies the core yarn C to the draft device 6 while applying tension. At this time, the 2 nd solenoid valve is closed and no air is supplied to the core yarn feeder 101.

Next, the operation of the core yarn supplying device 7 when the supply of the core yarn C from the core yarn feeding mechanism 100 to the downstream side is stopped (that is, when the spinning is stopped or interrupted) will be described with reference to fig. 8.

When a yarn defect is detected by the spun yarn monitoring device 9, the tension sensor 10, and/or the core yarn monitoring device 90, the unit controller 15 opens the 1 st electromagnetic valve. When the 1 st electromagnetic valve is opened, first, the clamp portion 106 is switched to the clamped state, and the supply of the core yarn C is stopped. At this time, the cutting section 107 operates in conjunction with the nip 106 to cut the core yarn C on the downstream side of the nip 106. Subsequently, the tension applying section 71 is switched to the non-tension applying state, and then the slack applying section 81 is switched to the slack applying state. The tension applying portion 71, the slack applying portion 81, and the clamping portion 106 switched to the above state are held in this state.

If the tension applying section 71 is switched to the non-tension applying state after the slack applying section 81 is switched to the slack applying state, the following state occurs. When the core yarn C is slackened, the clamping portion 106 clamps the core yarn C, and the tension applying portion 71 applies tension to the core yarn C. That is, the core yarn C positioned between the nip 106 and the tension applying portion 71 is restrained by the nip 106 and the tension applying portion 71. The slack is applied to the core yarn C by the slack applying portion 81 by pulling the core yarn C thus restrained upward.

Therefore, when slack is applied, the core yarn C strongly rubs against the fixed piece 73, the movable piece 74, and the edge of the hole 83 of the tension applying portion 71. The strongly rubbed core yarn C is sometimes electrostatically charged and released (i.e., the bundled core yarn C is randomly split). If the core yarn C in this state is fed by the core yarn feeding section 101, a feeding error (feeding error) may occur.

In the present embodiment, since the tension of the core yarn C by the tension applying portion 71 is released when the core yarn C is applied with slack, the core yarn C is suppressed from strongly rubbing against the fixed piece 73, the movable piece 74, and the edge of the hole 83 of the tension applying portion 71. Therefore, the release of the core yarn C (the quality degradation of the core yarn C) is suppressed, and the feeding error is also suppressed.

When the supply of the core yarn C is restarted, the unit controller 15 closes the 1 st electromagnetic valve. When the 1 st electromagnetic valve is closed, the clamping portion 106 is first switched to the non-clamping state, then the tension applying portion 71 is switched to the tension applying state, and then the slack applying portion 81 is switched to the non-slack applying state. The tension applying portion 71, the slack applying portion 81, and the clamping portion 106 switched to the above state are held in this state. Then, the 2 nd electromagnetic valve is opened, and the core yarn C is sent out to the draft device 6 by the core yarn sending-out portion 101. Thereby, the supply of the core yarn C is restarted.

As described above, in the spinning machine 1 and the core yarn supply device 7 of the present embodiment, when the supply of the core yarn C to the air-jet spinning device 8 (the supply of the core yarn C on the downstream side from the outlet portion (the outlet of the core yarn feeding mechanism 100) of the core yarn supply device 7) is stopped, the application of the tension to the core yarn C by the tension applying portion 71 can be cancelled. This can suppress the occurrence of a trouble in the core yarn C due to the application of tension. As a result, a feeding error of the core yarn C can be suppressed. Therefore, labor and time are saved for feeding the core yarn C, for example, by manual work of an operator, in the case where a feeding error of the core yarn C occurs.

The core yarn feeding device 7 of the present embodiment includes a tension applying section 71 for bending the core yarn C and applying tension to the core yarn C, and an outlet section (outlet of the core yarn feeding mechanism 100) disposed downstream of the tension applying section 71 in the feeding direction of the core yarn C. The tension applying section 71 makes the degree of bending of the core yarn C when the supply of the core yarn C from the outlet section to the downstream side is stopped smaller than the degree of bending of the core yarn C when the supply of the core yarn C from the outlet section to the downstream side is performed.

In the spinning machine 1 and the core yarn supply device 7 of the present embodiment, the tension applying section 71 acts on the core yarn C as follows: when the supply of the core yarn C from the outlet portion to the downstream side is stopped, the core yarn C passing through the tension applying portion 71 is straight, and when the supply of the core yarn C from the outlet portion to the downstream side is performed, the core yarn C passing through the tension applying portion 71 is bent.

In the present embodiment, when the clamping section 106 is in the clamped state and the supply of the core yarn C is stopped, the slack applying section 81 is maintained in the slack applying state and the tension applying section 71 is maintained in the non-tension applying state. This suppresses the core yarn C located between the nip 106 and the tension applying portion 71 from being restricted by the nip 106 and the tension applying portion 71 when the supply of the core yarn C is stopped. Therefore, even if the slack applying section 81 applies slack to the core yarn C, the core yarn C is prevented from being forcibly pulled. As a result, the occurrence of defective conditions of the core yarn C is suppressed. As a problem of the core yarn C, when slack is applied, the core yarn C strongly rubs against the fixed piece 73, the movable piece 74, and the edge of the hole 83 of the tension applying portion 71, and is electrostatically charged and released, thereby causing a feeding error of the core yarn C. According to the present embodiment, the strong friction with the tension applying portion 71 is suppressed, and as a result, the release of the core yarn C is suppressed. Further, another example of the trouble of the core yarn C is that the core yarn C is stretched due to, for example, being forcibly pulled, a desired slack length cannot be secured, and a feeding error of the core yarn C occurs. According to the present embodiment, a desired slack length of the core yarn C can be secured.

In the present embodiment, there is no mechanism for restraining the core yarn C between the tension applying portion 71 and the package supporting portion 50. That is, only the guide roller 53 and the core yarn carrier 61 for guiding the core yarn C are present, and there is no mechanism for actively applying tension to the core yarn C as in the tension applying section 71. Thus, when the supply of the core yarn C is stopped, the application of the tension to the core yarn C is further suppressed.

In the present embodiment, the tension applying section 71 includes a fixed piece 73 and a movable piece 74 for bending the core yarn C a plurality of times and applying tension to the core yarn C. Thus, when the core yarn C is fed, the core yarn C is bent a plurality of times, and therefore, tension is stably applied to the core yarn C. When the supply of the core yarn C is stopped, the core yarn C positioned between the fixed piece 73 and the movable piece 74 becomes substantially linear and does not bend. Therefore, when the core yarn C is lifted upward by the slack applying portion 81, friction between the core yarn C and each of the rotating shafts 73a and the protrusions 74a is suppressed. As a result, electrostatic charging to the core yarn C is suppressed.

The present invention is not limited to the above embodiment. In the above embodiment, the tension applying section 71 does not apply tension to the core yarn C when the supply of the core yarn C is stopped (i.e., the tension approaches zero indefinitely), but is not limited thereto. The tension applying section 71 may apply a lower tension to the core yarn C when the supply of the core yarn C is stopped than when the core yarn C is supplied (that is, the tension may be greater than zero). Even in this case, the occurrence of a trouble in the core yarn C due to the application of tension can be sufficiently suppressed.

In the above embodiment, the tension applying unit 71 is switched to the non-tension applying state and held in the non-tension applying state before the slack applying unit 81 is switched to the slack applying state, but the present invention is not limited to this. The tension applying section 71 may be switched to the non-tension applying state and held in the non-tension applying state at the same time as the slack applying section 81 is switched to the slack applying state. Even in this case, the occurrence of a trouble in the core yarn C due to the application of tension can be sufficiently suppressed. In the above embodiment, the timing of switching the states of the tension applying portion 71, the slack applying portion 81, and the clamping portion 106 is different from each other, but all of them may be performed simultaneously. The timing at which the core yarn feeding portion 101 feeds the core yarn C may be the same as the timing at which the states of the tension applying portion 71, the slack applying portion 81, and the nip portion 106 are switched.

In the above embodiment, the core yarn C is exemplified as a multifilament yarn, but the core yarn C is not limited thereto. For example, the core yarn C may be a processed yarn (elastic yarn) or a monofilament yarn having good stretchability. In the conventional core yarn supplying device, when the core yarn C is used as a processed yarn, the core yarn C is forcibly pulled upward when slack is given to the core yarn C, and the core yarn C is elastically deformed (the core yarn C is stretched). The elastically deformed core yarn C may be released from the nip 106 by a force to be restored when it is extended to a predetermined length or more. In the above embodiment, since the application of the tension to the core yarn C is released when the core yarn C is applied with slack, the core yarn C is prevented from coming off the nip 106. As the core yarn C, yarns other than multifilament yarns and processed yarns may be used.

In the above embodiment, the supply of air to the

cylinders

76, 82, and 108 is collectively controlled by the 1 st solenoid valve, but the present invention is not limited thereto. For example, a plurality of (e.g., 3) electromagnetic valves may be provided individually corresponding to the

respective cylinders

76, 82, 108. In this case, the states of the tension applying portion 71, the slack applying portion 81, and the clamping portion 106 can be individually switched.

As a specific example, in the above embodiment, when the supply of the core yarn C is restarted, the tension applying portion 71 is switched to the tension applying state before the slack applying portion 81 is switched to the slack applying state. By providing the solenoid valves individually for the

respective cylinders

76, 82, and 108, the tension applying portion 71 can be switched to the tension applying state after the slack applying portion 81 is switched to the slack applying state and the clamping portion 106 is switched to the non-clamping state. Thus, the application of the tension to the core yarn C by the tension applying portion 71 is suppressed when the supply of the core yarn C is restarted (i.e., when the core yarn feeding portion 101 feeds the core yarn C). As a result, since the force that hinders the feeding of the core yarn C is buffered, the feeding error of the core yarn C is also suppressed.

Although the core yarn supply device 7 includes the slack applying portion 81 in the above embodiment, the core yarn supply device 7 may not include the slack applying portion 81. In this case, the timing at which the tension applying portion 71 is switched to the non-tension applying state may be any timing before or after the supply of the core yarn C is stopped (that is, the clamping portion 106 is switched to the clamped state).

Although the tension applying portion 71 in the above embodiment is a so-called shed-type tensioner having the fixed piece 73 and the movable piece 74, it may be a disc-type tensioner.

In the above-described spinning machine 1, each device is arranged such that the spun yarn Y supplied from the upper side is wound around the lower side in the machine body height direction. However, each device may be arranged such that the yarn fed on the lower side is wound on the upper side.

In the above-described spinning machine 1, at least one of the bottom rollers of the draft device 6 and the traverse guide 23 are driven by power from the second end frame 5 (i.e., the plurality of spinning units 2 are common). However, each part of the spinning unit 2 (for example, the draft device 6, the air-jet spinning device 8, the winding device 13, and the like) may be driven independently for each spinning unit 2.

The tension sensor 10 may be disposed upstream of the spun yarn monitoring device 9 in the traveling path of the spun yarn Y. A unit controller 15 may also be provided in each spinning unit 2. In the spinning unit 2, the wax feeding device 12, the tension sensor 10, and the spun yarn monitoring device 9 may be omitted. The winding device 13 may be driven by a driving motor provided in each spinning unit 2.

Although the spinning machine 1 is illustrated in fig. 1 as winding the parallel-wound package P, a conical-wound package may be wound. In the case of a package having a tapered winding shape, although the yarn is loosened by the traverse of the yarn, the slack can be absorbed by the yarn accumulating device 11.

Claims

1. A core yarn supply device for supplying a core yarn, comprising:

a tension applying section for applying tension to the core yarn and switching between a tension applying state in which tension is applied to the core yarn and a non-tension applying state in which tension is not applied to the core yarn;

an outlet portion disposed downstream of the tension applying portion in a feeding direction of the core yarn;

a slack applying section which is disposed downstream of the tension applying section in a feeding direction of the core yarn, applies slack to the core yarn, and is switched between a slack applying state in which the slack is applied to the core yarn and a non-slack applying state in which the slack is not applied to the core yarn;

a clamping section which is arranged on the downstream side of the slack applying section in the feeding direction, clamps the core yarn, and is switched between a clamping state in which the core yarn is clamped and a non-clamping state in which the core yarn is not clamped;

a 1 st air supply pipe connected to an air supply source and a plurality of pipes connected to the respective cylinders of the tension applying portion, the slack applying portion, and the holding portion; and

an electromagnetic valve mounted on the 1 st air supply pipe for controlling the supply and stop of the air supplied to each cylinder;

the solenoid valve is controlled by: when the supply of the core yarn is stopped, after the clamping part is switched to the clamping state, the tension applying part is switched to a non-tension applying state, and finally the slack applying part is switched to a slack applying state; alternatively, when the supply of the core yarn is started, after the clamping portion is switched to the non-clamping state, the tension applying portion is switched to the tension applying state, and finally the slack applying portion is switched to the non-slack applying state.

2. A core yarn supply device for supplying a core yarn, comprising:

a tension applying section for bending the core yarn to apply tension to the core yarn and switching between a tension applying state in which tension is applied to the core yarn and a non-tension applying state in which tension is not applied to the core yarn;

3. The core yarn feeding device according to claim 2, wherein the tension applying portion acts on the core yarn as follows: when the supply of the core yarn from the outlet portion to the downstream side is stopped, the core yarn passing through the tension applying portion is straight; when the core yarn is fed from the outlet portion to the downstream side, the core yarn passing through the tension applying portion is bent.

4. The core yarn supply device according to any one of claims 1 to 3, comprising a package support portion for supporting a core yarn package in which the core yarn is wound,

there is no mechanism for restraining the core yarn between the tension applying section and the package supporting section.

5. The core yarn supply device according to any one of claims 1 to 3, wherein the tension applying section has a bending section for bending the core yarn a plurality of times to apply tension to the core yarn.

6. The core yarn feeding device according to claim 4, wherein the tension applying section includes a bending section for bending the core yarn a plurality of times to apply tension to the core yarn.

7. A spinning machine is provided with:

the core yarn feeding device according to any one of claims 1 to 6,

a drafting device for drafting the fiber bundle,

an air spinning device for twisting the fiber bundle with the core yarn as a core to produce a yarn, and

and a winding device for winding the yarn.

8. The spinning machine according to claim 7, said drawing device having a plurality of roller pairs,

the core yarn feeding device is configured to feed the core yarn between 2 adjacent roller pairs of the plurality of roller pairs,

when the supply of the core yarn to the air spinning device is stopped, the core yarn supply device clamps the yarn end of the core yarn in the core yarn supply device,

when the core yarn is supplied to the air-jet spinning device, the draft device supplies the core yarn supplied from the core yarn supply device to the air-jet spinning device together with the fiber bundle.