CN110158207B

CN110158207B - Air spinning machine and air spinning method

Info

Publication number: CN110158207B
Application number: CN201910078123.XA
Authority: CN
Inventors: 中山升
Original assignee: Murata Machinery Ltd
Current assignee: Murata Machinery Ltd
Priority date: 2018-02-13
Filing date: 2019-01-25
Publication date: 2022-12-09
Anticipated expiration: 2039-01-25
Also published as: JP2019137944A; EP3524556A1; CN110158207A

Abstract

The invention provides an air spinning machine and an air spinning method. The air spinning machine is provided with an air spinning device (3), a yarn accumulating roller (51), a winding device (7), a yarn monitoring device, and a control unit. An air spinning device (3) twists a fiber bundle (9) with a swirling air flow to generate a spun yarn (10). The yarn accumulating roller accumulates the spun yarn (10). The winding device (7) winds the spun yarn (10) accumulated in the yarn accumulation roller to form a package (70). The yarn monitoring device is disposed between the air spinning device (3) and the yarn accumulating roller (51), and can detect a long defect (L) and a short defect of the spun yarn (10). When a long defect is detected in the spun yarn (10) by the yarn monitoring device, the control section stops the rotation of the package to interrupt the winding of the spun yarn by the winding device in a state where at least a part of the long defect is accumulated in the yarn accumulation roller.

Description

Air spinning machine and air spinning method

Technical Field

The invention relates to an air spinning machine and an air spinning method. More specifically, the present invention relates to a yarn joining method for a yarn defect (yarn defect) having a different length.

Background

Conventionally, the following structure is known in a yarn winding machine: the yarn splicing device is provided with a yarn monitoring device for monitoring the presence or absence of a running yarn or the quality of the yarn, and the yarn splicing device for cutting the yarn when a yarn defect is detected by the yarn monitoring device, and then removing the yarn defect, and splicing the yarn from the spinning section and the yarn from the winding section. Patent document 1 discloses such a yarn winding machine.

The yarn winding machine of patent document 1 includes an air spinning device, a yarn accumulating device, a yarn monitoring device provided downstream of the yarn accumulating device, a yarn splicing device, and a winding section for winding a yarn to form a package. In this yarn winding machine, when the yarn monitoring device detects a yarn defect, after the spinning by the air spinning device is stopped, the rotation of the package is stopped in a state where the yarn from the yarn accumulating device to the winding section is continuous. As a result, the yarn defect is wound into the package.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2016-16957

Disclosure of Invention

In the structure of patent document 1, after the air spinning device stops spinning, the yarn downstream of the yarn accumulating device is cut, and the excess yarn wound around the yarn accumulating device is removed by the excess yarn suction device. Therefore, in the structure of patent document 1, a certain amount of excess yarn wound around the yarn accumulating device needs to be removed, and an amount of yarn capable of removing a yarn defect needs to be unwound from the package, so that the amount of the removed yarn increases, and the time of the yarn joining cycle also increases.

In patent document 1, since the yarn monitoring device is disposed in the vicinity of the winding section, the measurement accuracy of the yarn monitoring device is lowered due to the influence of the yarn being traversed when the yarn is wound into the package by the winding section.

The invention aims to provide an air spinning machine and an air spinning method, which can maintain the measurement of a yarn monitoring device at high precision, reduce the quantity of yarn ends and shorten the time of a yarn splicing cycle.

According to a first aspect of the present invention, there is provided an air spinning machine of the following construction. That is, the air spinning machine includes an air spinning device, a yarn accumulating roller, a winding device, a yarn monitoring device, and a control unit. The air spinning device twists a fiber bundle with a swirling air flow to produce a spun yarn. The yarn accumulating roller accumulates the spun yarn. The winding device winds the spun yarn accumulated on the yarn accumulation roller to form a package. The yarn monitoring device is disposed between the air spinning device and the yarn accumulating roller, and can detect a long defect and a short defect of the spun yarn. The control unit stops the rotation of the package to interrupt the winding of the spun yarn by the winding device in a state where at least a part of the long defect is accumulated in the yarn accumulation roller when the long defect is detected in the spun yarn by the yarn monitoring device.

This can prevent the long defect from being wound in the package, and the spun yarn unwound from the package can be short in length, so that the yarn end amount can be reduced, and the time of the yarn joining cycle can also be shortened. By disposing the yarn monitoring device at a position where the travel of the spun yarn is relatively stable, the measurement accuracy of the yarn monitoring device can be maintained at a high level.

In the air spinning machine, it is preferable that the control unit stops the rotation of the package so that the short defect is located downstream of the yarn accumulating roller in a traveling direction of the spun yarn when the short defect is detected in the spun yarn by the yarn monitoring device.

Accordingly, since the normal spun yarn (hereinafter, also referred to as "normal yarn") accumulated in the yarn accumulation roller is wound into the package before the short defect is detected, the amount of the yarn end can be reduced even when the shortage defect is removed, and the time of the yarn joining cycle can be shortened.

In the air spinning machine, it is preferable that the control unit interrupts the generation of the spun yarn by the air spinning device and generates a yarn end of the spun yarn wound around the package when the yarn monitoring device detects the long defect or the short defect in the spun yarn.

Thus, when a defect of the yarn is detected, the generation of the spun yarn is interrupted, thereby avoiding the useless generation of the spun yarn. Further, since the spun yarn is cut by stopping the spinning, a separate device for cutting the spun yarn is not required. Therefore, the structure can be simplified.

In the air spinning machine, it is preferable that the air spinning machine further includes a first removing device that is disposed in the vicinity of the yarn accumulating roller and removes a long defect included in the spun yarn.

This makes it possible to easily remove long defects accumulated in the yarn accumulating roller.

In the air spinning machine, the following structure is preferable. That is, the first removing device includes a hollow tube and an opening/closing member. The hollow tube is connected with a negative pressure source. The opening/closing member is opened to allow the flow of the suction air flowing through the hollow tube to pass therethrough, and is closed to block the flow of the suction air.

This enables the long defect to be removed by the suction air flow. Further, the operation and the stop of the operation of the first removing device can be substantially switched by a simple structure using the opening/closing member.

In the air spinning machine, it is preferable that the control unit reverses the yarn accumulating roller at the same time as or after the opening/closing member is opened after the rotation of the yarn accumulating roller is stopped.

Thereby, the long defect is easily caught by the first removing device, and the long defect can be quickly removed.

In the air spinning machine, it is preferable that the air spinning machine further includes a second removing device which is rotatably disposed on a downstream side of the yarn accumulating roller and removes the shortage of the spun yarn.

Thus, when the rotation of the package is stopped at a timing at which the short defect is arranged on the downstream side of the yarn accumulating roller, the short defect can be easily removed by the second removing device.

In the air spinning machine, it is preferable that the second removing device removes the shortage defect included in the spun yarn in a step of capturing the spun yarn from the package and guiding the captured spun yarn to a yarn joining device.

Thus, a step for removing the short defect can be omitted, and the time of the yarn joining cycle can be shortened. Further, the second removing device can be used as a device for guiding the spun yarn to the yarn joining device. Therefore, the structure can be simplified.

In the air spinning machine, the control unit may stop the rotation of the yarn accumulating roller after the rotation of the package is stopped.

The yarn end of the spun yarn cut at the upstream side of the yarn accumulating roller is wound around the rotating yarn accumulating roller, and then slightly swung while being slightly separated from the outer peripheral surface of the yarn accumulating roller by a centrifugal force. By continuing this state for a long time, the yarn end can be prevented from being entangled in the yarn layer accumulated in the yarn accumulation roller.

In the air spinning machine, the following configuration is preferable. That is, the air spinning machine includes a stored yarn detecting device. The accumulated yarn detecting device detects whether or not the spun yarn accumulated on the yarn accumulating roller is present. The control unit stops the rotation of the package at a predetermined time interval after the yarn accumulating detection unit detects that the spun yarn is not accumulated on the yarn accumulating roller when the yarn monitoring unit detects the short defect.

Thus, the shortage trap can be positioned downstream of the yarn accumulating roller when the rotation of the package is stopped.

In the air spinning machine, the following structure is preferable. That is, the air spinning machine includes a yarn detecting device and an air jet device. The yarn detecting device is disposed between the yarn accumulating roller and the winding device, and detects the presence or absence of the spun yarn in a yarn path in which the spun yarn travels. The air injection device is disposed between the yarn accumulating roller and the winding device, and injects air to the yarn path. The control unit performs air injection by the air injection device while rotating the package in a winding direction in which the spun yarn is wound, after generation of the spun yarn by the air spinning device is interrupted. When the yarn detecting device detects that the spun yarn is not present in the yarn path when the air injecting device injects air into the yarn path, the control unit stops the rotation of the package.

This makes it possible to quickly and reliably detect that the yarn end of the spun yarn cut on the upstream side of the yarn accumulating roller has separated from the yarn accumulating roller.

In the air spinning machine, the yarn accumulating roller preferably has an accumulating portion having a diameter of 70mm to 110 mm.

Thus, the winding of the package can be stopped in a state where the long defect is surely left in the yarn accumulating roller, and the processing time required for removing the long defect can be shortened.

In the air spinning machine, the yarn accumulating roller may accumulate the spun yarn of 10m or more.

Thus, even a long defect of 10m or more can be caused, the winding of the package can be stopped with the long defect remaining on the yarn accumulating roller.

According to a second aspect of the present invention, the following air spinning method is provided. That is, the air spinning method includes an air spinning step, a yarn accumulating step, a winding step, a yarn monitoring step, and a control step. In the air spinning step, the fiber bundle is twisted by a whirling air flow in the air spinning device to produce a spun yarn. In the yarn accumulating step, the spun yarn is accumulated by a yarn accumulating roller. In the winding step, the spun yarn accumulated in the yarn accumulating roller is wound to form a package. In the yarn monitoring step, the spun yarn can be detected for a long defect and a short defect by a yarn monitoring device disposed between the air spinning device and the yarn accumulating roller. In the control step, when the yarn monitoring device detects the long defect in the spun yarn, the rotation of the package is stopped to interrupt the winding of the spun yarn in the winding step while at least a part of the long defect is accumulated in the yarn accumulation roller.

This prevents the long defect from being wound into the package, and the spun yarn unwound from the package can be short in length, so that the yarn end amount can be reduced, and the time of the yarn joining cycle can be shortened.

Drawings

Fig. 1 is a side view showing a structure of a spinning unit provided in a spinning machine according to an embodiment of the present invention.

Fig. 2 is a perspective view showing a positional relationship between the yarn accumulating roller and the yarn suction device.

Fig. 3 is a perspective view showing a schematic configuration of the air jet apparatus.

Fig. 4 is a control block diagram of the spinning unit.

Fig. 5 is a side view showing a state of the spinning unit immediately after the air spinning device stops spinning.

Fig. 6 is a side view showing a state where the winding device stops winding and the first yarn catching guide device is located at the first yarn catching position.

Fig. 7 is a side view showing a state in which the winding device rotates the package forward at a low speed and the yarn end is sucked and caught by the yarn catcher.

Fig. 8 is a side view showing a state in which the winding device stops the normal rotation of the package and the spun yarn is restricted by the yarn restricting guide.

Fig. 9 is a side view showing a state in which the winding device reverses the package and guides the first yarn and the second yarn to the yarn joining device by the first catching guide device and the second catching guide device, respectively.

Fig. 10 is a side view showing a state of the spinning unit immediately after the air spinning device stops spinning when the long defect is detected.

Fig. 11 is a side view showing a state of the spinning unit immediately after the long defect is detected and the downstream side cutter cuts the spun yarn.

Fig. 12 is a timing chart of operations of the respective sections during yarn splicing.

Fig. 13 is a timing chart showing the operation of the air jet device and the winding bobbin after a yarn splicing failure.

Description of the reference numerals

3. Air spinning device

4. Yarn monitoring device

7. Winding device

9. Fiber bundle

10. Spun yarn

51. Yarn storage roller

70. Package of paper

90. Control unit

Detailed Description

Next, embodiments of the present invention will be described with reference to the drawings. In the following description, "upstream" and "downstream" refer to upstream and downstream in the traveling direction of the sliver 8, the fiber bundle 9, and the spun yarn 10 when the spun yarn 10 is wound.

The spinning machine (air spinning machine) includes a plurality of spinning units 100 arranged in parallel, and a machine station control device, not shown, that collectively manages the plurality of spinning units 100. Each spinning unit 100 generates a spun yarn 10 from the sliver 8, and winds the generated spun yarn 10 to form a package 70.

The spinning machine includes a control unit 90 (see fig. 4) that can communicate with the machine table control device. The control unit 90 is a computer provided with hardware such as a CPU, ROM, and RAM, and software such as a control program, and controls the operations of the respective units provided in the spinning unit 100. The control unit 90 may be provided for each spinning unit 100, or may be provided for each of a plurality of spinning units 100.

As shown in fig. 1, each spinning unit 100 mainly includes a draft device 2, an air spinning device 3, a yarn monitoring device 4, a yarn accumulating device 5, a yarn splicing device 6, and a winding device 7, which are arranged in this order from upstream to downstream.

The draft device 2 includes a plurality of (four in the present embodiment) draft rollers and a plurality of (four in the present embodiment) counter rollers arranged to face the draft rollers. The draft device 2 sandwiches and conveys the sliver 8 supplied from a can (not shown) via a sliver guide between draft rollers and counter rollers, thereby drawing (drafting) the sliver 8 to a predetermined fiber amount (or thickness) to generate a fiber bundle 9.

The four draft rollers are a rear roller 21, a third roller 22, a middle roller 24 to which a rubber apron 23 is attached, and a front roller 25 in this order from the upstream side. Each draft roller is rotationally driven at a predetermined rotational speed. The control section 90 can control the rotation speed of each draft roller by controlling the rotation of a draft motor 91 described later. The control section 90 appropriately controls the rotational speed of each draft roller in accordance with the generation speed of the spun yarn 10 by the air spinning device 3. In fig. 4, one draft motor 91 is illustrated, but one draft motor may be provided for each draft roller. Alternatively, only the rear roller 21 and the third roller 22 may be driven by a common draft motor.

An air spinning device 3 is disposed immediately downstream of the front roller 25. The air spinning device 3 includes a spinning nozzle, not shown, and twists the fiber bundle 9 supplied from the draft device 2 by a whirling air flow generated by injecting compressed air from the spinning nozzle into the air spinning device 3, thereby producing a spun yarn 10.

The air spinning device 3 can perform the discharge spinning and the normal spinning based on a control command of the control unit 90. The discharge spinning is a spinning operation performed when the air spinning device 3 starts or restarts the generation of the spun yarn 10, unlike a normal spinning, in a method of generating the spun yarn 10 and a spinning speed. The normal spinning is a spinning operation in which the spun yarn 10 wound by the winding device 7 is continuously generated after the yarn discharge spinning.

A spun yarn detecting device 30 is disposed immediately downstream of the air spinning device 3. The spun yarn detecting device 30 detects the presence or absence of the spun yarn 10 immediately after the generation and delivery of the air spinning device 3. The spun yarn detection device 30 can use, for example, a non-contact optical sensor, a capacitance sensor, or the like.

The yarn monitoring device 4 is disposed downstream of the spun yarn detecting device 30. The yarn monitoring device 4 monitors the quality (thickness, etc.) of the traveling spun yarn 10 by a light-transmitting sensor, and detects a yarn defect included in the spun yarn 10. The yarn monitoring device 4 is not limited to a light-transmitting sensor, and may monitor the quality of the spun yarn 10 using, for example, a capacitance sensor.

The yarn defect is a portion where the spun yarn 10 has an abnormality, and includes a short defect in a centimeter unit, a long defect in a meter unit, and the like. The shortage includes, for example, nubs, which are portions thicker than other portions due to spinning defects and the mixing of foreign substances, neps, which are clusters formed by intertwining fine fibers, and impurities, which are stems and leaves of cotton. The long defects include relatively long uneven thickness and/or uneven thickness of the spun yarn 10 due to uneven thickness of the sliver 8, a portion where the spun yarn 10 is tapered due to the fiber bundle 9 being wound around (wrap up) the opposed rollers of the draft device 2, and yarn unevenness where HD (Hairiness Difference) is abnormal for some reason. In the present embodiment, a yarn defect having an abnormal portion length of 50cm or more is defined as a long defect, and a yarn defect having an abnormal portion length shorter than 50cm is defined as a short defect.

When the yarn defect is detected by the yarn monitoring device 4, the spinning is stopped in the air spinning device 3, and therefore the strength of the spun yarn 10 is reduced in the portion of the air spinning device 3, and the spun yarn 10 is cut. In this way, the air spinning device 3 has a function as a cutting section for cutting the spun yarn 10 when the yarn monitoring device 4 detects a yarn defect. Further, the spun yarn 10 may be cut by a cutter.

As described above, in the configuration in which the yarn monitoring device 4 is provided between the air spinning device 3 and the yarn accumulating device 5, the yarn defect can be positioned in the vicinity of the yarn end a (the yarn end C in fig. 10) of the spun yarn 10 that is cut, as compared with the configuration in which the yarn monitoring device 4 is provided on the downstream side of the yarn accumulating device 5. This can reduce the amount of thread ends generated during the yarn joining.

A first guide 11 is disposed downstream of the yarn monitoring device 4. The first guide 11 is configured to be movable so as to pull the spun yarn 10 toward the yarn accumulating device 5 at the time of yarn splicing or the like. The first guide 11 is configured to be rotatable between a guide position shown by a solid line and a standby position shown by a chain line in fig. 1 by driving a first guide motor 93 described later.

A tension sensor 40 is disposed downstream of the first guide 11. The tension sensor 40 is configured as a load cell type sensor, for example. The tension sensor 40 measures the tension of the advancing spun yarn 10, and outputs an electric signal corresponding to the tension to the control section 90.

The yarn accumulating device 5 is disposed downstream of the tension sensor 40. The yarn accumulating device 5 includes a yarn accumulating roller 51, an accumulating motor 52 for rotationally driving the yarn accumulating roller 51, and a yarn hooking member 53.

The yarn accumulating roller 51 has an accumulating portion 51a having a diameter of 70mm to 110mm, and temporarily accumulates the spun yarn 10 by winding the spun yarn 10 around an outer peripheral surface of the accumulating portion 51a. The yarn accumulating roller 51 is formed to be able to accumulate the spun yarn 10 of 10m or more (50 m or more in the present embodiment). In this way, since a large amount of the spun yarn 10 can be accumulated by the yarn accumulating roller 51, the mountable range of the accumulated yarn detecting device 50 that can detect the amount of the accumulated yarn by the yarn accumulating roller 51 is expanded. In fig. 2, the reservoir portion 51a is illustrated as having a cylindrical shape with a fixed outer diameter. However, the accumulation portion 51a may be formed in a tapered shape whose diameter decreases from the upstream side toward the downstream side, or may include a plurality of tapered portions.

An intermediate shaft, not shown, is provided between the yarn accumulating roller 51 and the accumulating motor 52. The intermediate shaft can reduce wear of the rotating shaft and the bearing of the storage motor 52. In this intermediate shaft, portions having mutually different diameters are adjacent to each other in the axial direction, and as a result, the intermediate shaft is formed in a stepped shape. The shaft hole of the yarn accumulating roller 51 is formed so that only a relatively thin portion of the intermediate shaft located on the tip end side can be inserted. This makes it possible to easily position the yarn accumulating roller 51. Further, the intermediate shaft may not be formed in a stepped shape.

A yarn hooking member 53 is attached to a downstream end portion of the yarn accumulating roller 51. The yarn hooking member 53 is supported to be rotatable relative to the yarn accumulating roller 51. A permanent magnet is attached to one of the yarn hooking member 53 and the yarn accumulating roller 51, and a hysteresis material is attached to the other. By these magnetic mechanisms, a torque is generated against the relative rotation of the yarn hooking member 53 with respect to the yarn accumulating roller 51. Therefore, only when a force such as overcoming the torque is applied to the yarn hooking member 53 (when a tension equal to or greater than a predetermined value is applied), the yarn hooking member 53 can rotate relative to the yarn accumulating roller 51, and the spun yarn 10 wound around the yarn accumulating roller 51 can be unwound. When a force against the torque is not applied to the yarn hooking member 53, the yarn accumulating roller 51 and the yarn hooking member 53 rotate integrally, and the spun yarn 10 is accumulated on the yarn accumulating roller 51. An electromagnet may be installed instead of the permanent magnet. Instead of the magnetic mechanism, a drive motor for rotationally driving the yarn hooking member 53 may be provided.

In this way, the yarn accumulating device 5 operates to unwind the spun yarn 10 when the yarn tension on the downstream side increases, and to stop unwinding of the spun yarn 10 when the yarn tension decreases (the spun yarn 10 is about to slacken). Thus, the yarn accumulating device 5 can eliminate the slack of the spun yarn 10 and apply an appropriate tension to the spun yarn 10. As described above, the yarn hooking member 53 operates to absorb the variation in the yarn tension applied to the spun yarn 10 between the yarn accumulating device 5 and the winding device 7, and thereby can prevent the variation in the yarn tension from affecting the spun yarn 10 between the air spinning device 3 and the yarn accumulating device 5. Therefore, the spun yarn 10 between the air spinning device 3 and the yarn accumulating device 5 travels in a relatively stable state, and the detection accuracy of the yarn monitoring device 4 can be maintained at a high level by providing the yarn monitoring device 4 at this portion.

The storage motor 52 is configured as an electric motor capable of rotating in the normal direction and in the reverse direction, and is capable of rotating the yarn storage roller 51 in the reverse direction under a predetermined condition (for example, when a long defect is removed) to unwind the spun yarn 10 wound around the yarn storage roller 51.

A stored yarn detecting device 50 that detects the presence or absence of the spun yarn 10 stored in the yarn storage roller 51, and a yarn suction device (first removing device) 54 are disposed at a position corresponding to an upstream portion of the storage portion 51a of the yarn storage roller 51 (a portion where the spun yarn 10 starts to be wound) and in the vicinity of the yarn storage device 5.

The accumulated yarn detecting device 50 is composed of, for example, an optical sensor, and is disposed at a position where the spun yarn 10 accumulated on the yarn accumulating roller 51 can be detected at a distance of 10m to 50 m. The accumulated yarn detecting device 50 also functions to detect the amount of the spun yarn 10 accumulated in the yarn accumulating roller 51. The desired amount of storage can be easily achieved by providing the storage yarn detecting device 50 at a position corresponding to the desired amount of storage and adjusting the spinning speed and/or the winding speed using the detection result of the storage yarn detecting device 50. The accumulated yarn detecting device 50 may be omitted. In this case, the storage amount of the spun yarn 10 stored in the yarn storage roller 51 is calculated based on a speed difference between a speed (spinning speed) at which the spun yarn 10 is guided to the yarn storage roller 51 and a speed (winding speed) at which the spun yarn 10 is unwound from the yarn storage roller 51.

As shown in fig. 2, the yarn suction device 54 is disposed at a position opposite to the accumulated yarn detecting device 50 via the yarn accumulating roller 51. The yarn suction device 54 includes a hollow tube and a yarn suction valve (opening and closing member) 54a shown in fig. 4. The hollow tube is connected to a blower, not shown, as a negative pressure source, and the spinning machine can generate a suction air flow at the tip end of the hollow tube. The yarn suction valve 54a is provided in an air path between the hollow tube and a blower not shown, and is controlled by a control unit 90 described later. Instead of the yarn suction valve 54a, a shutter may be used as an opening/closing member, for example.

The control unit 90 can generate or stop the suction air flow at the distal end portion of the tube by, for example, controlling the opening and closing of the yarn suction valve 54a to pass or block the suction air flow flowing in the tube of the yarn suction device 54. The yarn suction device 54 generates a suction air flow at the distal end portion of the tube, and thereby can suck and catch the yarn end a (fig. 5) or the yarn end C (fig. 10) cut at the upstream side of the yarn accumulating device 5.

The yarn escape guide 14 is disposed downstream of the yarn accumulating roller 51 and near a yarn path along which the spun yarn 10 travels. The yarn escape guide 14 is provided to be rotatable from one side of the yarn path on the downstream side of the yarn accumulating roller 51 (standby position shown by solid line in fig. 1) to the other side (operation position shown by chain line in fig. 1). The spun yarn 10 is released from the yarn hooking member 53 by the movement of the yarn release guide 14 to the operation position.

The second guide 12 is disposed downstream of the yarn accumulating roller 51 and the yarn escape guide 14. A third guide 13 that regulates the movement of the spun yarn 10 unwound from the yarn accumulating roller 51 is disposed immediately downstream of the second guide 12.

A yarn trap 41 connected to an unillustrated blower is disposed immediately downstream of the third guide 13. The yarn trap 41 is formed of a hollow tube, and the tip end portion is provided near the yarn path. The yarn trap 41 generates a suction airflow at the leading end portion thereof to suck and remove dust such as fly waste attached to the traveling spun yarn 10.

A yarn joining device 6 is disposed downstream of the yarn trap 41. The yarn joining device 6 joins the spun yarn 10 (first yarn) from the air spinning device 3 and the spun yarn 10 (second yarn) from the package 70 when the spun yarn 10 between the air spinning device 3 and the package 70 is in the cut state for some reason. In the present embodiment, the yarn joining device 6 is a twisting device that twists yarn ends with each other by a swirling air flow. The yarn splicing device 6 is not limited to the splicing device described above, and a mechanical knotter or the like may be used, for example.

The spinning unit 100 includes a catching and guiding device that guides the spun yarn 10 to the yarn joining device 6. The catching guide device is composed of a first catching guide device 15 that guides the first yarn and a second catching guide device (second removing device) 16 that guides the second yarn.

A base end portion of the first catching guide 15 is rotatably supported, and the first catching guide 15 is rotatable in the vertical direction with the base end portion as a rotation center. The first catching guide device 15 is formed in a hollow shape, is connected to a blower not shown, and can generate a suction airflow at a distal end portion thereof. The first catching guide device 15 can move to a first yarn catching position where the yarn end B of the first yarn can be caught by rotating downward (see fig. 8). The first catching guide device 15 can guide the first yarn to the yarn joining device 6 by rotating upward after catching the first yarn.

The base end portion of the second catching guide 16 is rotatably supported, and the second catching guide 16 is rotatable in the vertical direction with the base end portion as a rotation center. The second catching guide device 16 is also hollow, is connected to an unillustrated blower, and can generate a suction airflow at the tip end portion. The second catching guide device 16 can move to a second yarn catching position (see fig. 8) capable of catching a yarn end (a yarn end a in fig. 8 and a yarn end E in fig. 11) of the second yarn by rotating upward. The second catching guide device 16 can guide the second yarn to the yarn joining device 6 by rotating downward after catching the second yarn.

In this state, the yarn joining device 6 is driven to join the first yarn and the second yarn, and the spun yarn 10 is made continuous between the air spinning device 3 and the package 70. Thereby, the winding of the spun yarn 10 into the package 70 can be resumed.

A yarn detecting device 60 is disposed downstream of the yarn joining device 6. The yarn detecting device 60 detects the presence or absence of the spun yarn 10 running in the yarn path. The yarn detecting device 60 may be configured to detect whether or not the yarn joining by the yarn joining device 6 is successful, the presence of a yarn end that may be mixed into the package 70, and the like. The yarn detecting device 60 can use, for example, a non-contact optical sensor or an electrostatic capacitance sensor.

An air jet device 61 and a yarn restricting guide 62 are disposed immediately downstream of the yarn detecting device 60. The air jet device 61 is connected to a compressed air source, not shown, and can jet compressed air to the yarn path. The yarn regulating guide 62 regulates the movement and position of the spun yarn 10 by catching the spun yarn 10 blown by the air jet device 61.

As shown in fig. 3, a main guide 64 and a sub guide 65 are provided on the downstream side of the yarn detecting device 60 in this order from the upstream side. The air injection device 61 is attached to the upstream side of the sub-guide 65 and above (on the downstream side of) the main guide 64. The air injection device 61 includes a main nozzle 61a and an auxiliary nozzle 61b, and injects compressed air between the main guide 64 and the auxiliary guide 65.

The air jet device 61 jets compressed air from the main nozzle 61a in a direction from the front of the air jet device 61 toward the yarn path. The auxiliary nozzle 61b is installed on the left side of fig. 3 with respect to the yarn path (the tip of the yarn restricting guide 62). The air jet device 61 also jets compressed air from the auxiliary nozzle 61b toward the yarn path so as to merge with the air jetted from the main nozzle 61 a. That is, the compressed air is obliquely injected from the auxiliary nozzle 61b to the yarn path. Accordingly, the spun yarn 10 that oscillates due to the traverse in the winding device 7 can be appropriately restricted by the yarn restricting guide 62. That is, the auxiliary nozzle 61b prevents the spun yarn 10 blown off from coming off from the yarn restricting guide 62.

By providing the air jet device 61 and the yarn restricting guide 62, the yarn end a (E) can be restricted, and the yarn end a (E) can be easily caught by the second catching guide device 16.

The winding device 7 is disposed downstream of the air jet device 61 and the yarn restricting guide 62. The winding device 7 is provided at a higher position than the upstream end of the draft device 2. The winding device 7 includes a swing arm 71 and a winding drum 72. The yarn path along which the spun yarn 10 travels from the yarn accumulating device 5 to the winding device 7 is guided by being bent by a downstream guide 63 arranged between the yarn detecting device 60 and the winding device 7.

The cradle arm 71 can rotatably support a winding tube 73 for winding the spun yarn 10. The rocker arm 71 is rotatable about its base end portion as a rotation center. Accordingly, even if the spun yarn 10 is wound around the winding tube 73 and the diameter of the package 70 increases, the contact between the package 70 and the winding drum 72 can be appropriately maintained, and the winding of the spun yarn 10 can be continued.

The winding drum 72 is rotated in contact with the outer peripheral surface of the winding tube 73 or the package 70 by transmission of a driving force of a winding drum motor 72a described later. A traverse groove, not shown, is formed in the outer peripheral surface of the winding tube 72, and the spun yarn 10 can be traversed by the traverse groove at a predetermined width. In this way, the winding device 7 winds the spun yarn 10 around the winding tube 73 while traversing the spun yarn, thereby forming the package 70.

Next, an electrical structure of the spinning unit 100 will be briefly described with reference to fig. 4. The spinning unit 100 includes a draft motor 91, a spinning valve 92, a first guide motor 93, a yarn escape guide motor 94, a second guide motor 95, a yarn joining cam motor 96, a catching guide motor 97, an air injection valve 98, a winding drum motor 72a, and a winding brake valve 99 for driving and braking the above-described devices.

The draft motor 91 is, for example, a plurality of electric motors, and can drive the rear roller 21, the third roller 22, the middle roller 24, and the front roller 25 of the draft device 2 at predetermined speeds.

The spinning valve 92 is configured as an electromagnetic valve disposed in a path for supplying compressed air from a compressed air source to the air spinning device 3. The spinning valve 92 can switch whether or not a whirling airflow for twisting and spinning the fiber bundle 9 is generated in the air spinning device 3.

The first guide motor 93 is an electric motor capable of rotating the first guide 11 to the guide position and the standby position with its base end portion as a rotation center and capable of rotating in the forward and reverse directions.

The yarn escape guide motor 94 is an electric motor capable of rotating the yarn escape guide 14 to the standby position and the operating position, and capable of rotating in the forward and reverse directions.

The second guide motor 95 is an electric motor capable of rotating the second guide 12 in the forward and reverse directions with its base end portion as a rotation center to an operating position and a standby position. During winding of the package 70, the second guide 12 is located at the operation position shown by the solid line in fig. 1, and guides the travel of the spun yarn 10 together with the third guide 13. After the yarn joining described later, the second guide 12 is moved from the standby position shown by the chain line in fig. 1 to the operating position, whereby the spun yarn 10 can be placed in the yarn path again.

The yarn joining cam motor 96 is an electric motor capable of rotating and driving a cam, not shown, provided in the yarn joining device 6, and capable of rotating in the forward direction and the reverse direction. The cam operates each yarn joining operation section (for example, a yarn collecting bar, a yarn pressing bar, a clamp section, a cutter, and the like) provided in the yarn joining device 6.

The catching guide motor 97 is an electric motor capable of rotating the first catching guide device 15 and the second catching guide device 16 in the vertical direction and capable of rotating in the forward and reverse directions. The catching guide motor 97 may include an electric motor that drives the first catching guide device 15 and an electric motor that drives the second catching guide device 16.

The air injection valve 98 is configured as an electromagnetic valve disposed in a path for supplying compressed air from a compressed air source to the air injection device 61. The air injection valve 98 can switch between the supply and the stop of the compressed air to the air injection device 61.

The winding brake valve 99 is an electromagnetic valve disposed in a path for supplying compressed air to an appropriate actuator (for example, a pneumatic cylinder) for operating a brake mechanism (not shown) of the winding device 7. The winding brake valve 99 is configured to be capable of switching between braking and braking release of the package 70 in the winding device 7.

The control unit 90 is electrically connected to the motors, and can control the rotation and stop of the motors, the number of rotations, and the like. The control unit 90 is electrically connected to the valves and can control opening and closing of the valves. The spun yarn detecting device 30, the yarn monitoring device 4, the accumulated yarn detecting device 50, and the yarn detecting device 60 are electrically connected to the control unit 90, and can output the detection results to the control unit 90.

Next, a description will be given of yarn joining performed when a yarn defect is detected by the yarn monitoring device 4. The flow of the yarn joining performed in the case where the short defect S is detected will be described with reference to fig. 5 to 9.

When the yarn monitoring device 4 detects the short defect S, the control section 90 immediately closes the spinning valve 92 to stop the rotation of the draft motor 91. As shown in fig. 5, when the spun yarn stops, the spun yarn 10 located on the upstream side of the accumulated yarn detecting device 50 is cut by the stop of the spun yarn. Thereby, the yarn end a is generated on the upstream side of the spun yarn 10 accumulated in the yarn accumulating device 5.

The control section 90 maintains the rotation of the package 70 until a predetermined winding time elapses after the spinning valve 92 is closed and the spun yarn 10 is no longer detected by the accumulated yarn detecting device 50. That is, the control section 90 stops the rotation of the package 70 after maintaining the rotation of the package 70 for a predetermined time, so that the shortage sink S included in the spun yarn 10 is located on the downstream side of the yarn accumulating roller 51. This enables the normal yarn accumulated in the yarn accumulating device 5 to be wound into the package 70, and thus the amount of yarn ends at the time of removing the short defect S can be reduced. By winding the normal yarn accumulated in the yarn accumulating device 5 at a normal winding speed, the time for the first low-speed winding described later can be shortened, and the time for the yarn joining cycle can be shortened.

The predetermined winding time can be set as appropriate based on the traveling speed of the spun yarn 10, the thickness of the spun yarn 10, and the like. Preferably, the rotation of the package 70 is completely stopped in a state where a small amount of the spun yarn 10 is wound around the storage portion 51a of the yarn storage roller 51. This can prevent the yarn end a from being entangled in the device between the yarn accumulating device 5 and the winding drum 72.

After the spinning is stopped and after a predetermined winding time has elapsed from the time point when the spun yarn 10 is no longer detected by the accumulated yarn detecting device 50, the control section 90 stops the rotation of the winding drum motor 72a, opens the winding brake valve 99, and operates the brake mechanism not shown. Thereby, the rotation of the package 70 is stopped.

After the rotation of the package 70 is stopped, the control section 90 stops the rotation of the accumulating motor 52 (i.e., the yarn accumulating roller 51). While the yarn accumulating roller 51 is rotating, the yarn end a is swung by a centrifugal force in a state slightly separated from the outer peripheral surface of the yarn accumulating roller 51. Therefore, by stopping the rotation of the yarn accumulating roller 51 at a later timing, the yarn end a can be prevented from being entangled with the yarn layer accumulated in the yarn accumulating roller 51.

The control section 90 performs a cleaning operation by the spinning nozzle at an appropriate timing during a period from the stop of the spinning to the stop of the rotation of the yarn accumulating roller 51. However, the cleaning operation may be omitted.

After the cleaning operation is completed, as shown in fig. 6, the control unit 90 rotates the first guide motor 93 to move the first guide 11 to the standby position (solid line).

At the same time, or before or after, the control section 90 rotates the catching guide motor 97 to move the first catching guide device 15 to the first yarn catching position (see the solid line in fig. 6).

After the rotation of the yarn accumulating roller 51 is stopped, the control section 90 opens the yarn suction valve 54a to generate a suction air flow at the tip end of the yarn suction device 54. At the same time or after, the control section 90 reverses the accumulating motor 52, and reverses the yarn accumulating roller 51 by 1.5 to 2 turns as shown in fig. 2. Thus, the spun yarn 10 is slightly unwound from the yarn accumulating roller 51, and the yarn end a can be easily caught by the yarn suction device 54. In this way, the yarn end a is sucked and caught by the yarn suction device 54, and the yarn end a can be prevented from being entangled with the yarn layer accumulated in the yarn accumulating roller 51 in the first low-speed winding process to be performed later.

After the reverse rotation of the yarn accumulating roller 51 is completed, that is, after the yarn end a is sucked and caught by the yarn suction device 54, the control section 90 operates the winding drum motor 72a to start the winding of the spun yarn 10 from the package 70 at the first low speed (for example, 10 to 30 m/min) as shown in fig. 7.

After the start of the first low-speed winding, the control unit 90 opens the air injection valve 98 after a predetermined time has elapsed, and the air injection device 61 injects compressed air toward the yarn path. The predetermined time is set as appropriate so that the injection of the compressed air by the air injection device 61 can be started at a timing before the yarn end a passes through the yarn detection device 60.

The spun yarn 10 accumulated in the yarn accumulating roller 51 is gradually wound into the package 70 by the first low-speed winding by the winding device 7. After that, the yarn end a is drawn out from the yarn suction device 54. When the yarn end a is released from the yarn suction device 54, it is sucked by the yarn trap 41 as shown in fig. 7. Then, by the continuation of the first low-speed winding by the winding device 7, the yarn end a is also drawn from the yarn trap 41. In this way, since the yarn end a is moved downstream while being held in stages, the yarn end a can be prevented from being entangled with other devices.

When the yarn end a is drawn out from the yarn trap 41, the yarn end a becomes a free state, and therefore, as shown in fig. 8, the yarn end a is blown off in a direction away from the yarn path by the air jet device 61 and hangs on the yarn restricting guide 62.

As shown in fig. 8, since the yarn end a is hooked on the yarn regulation guide 62 and separated from the yarn path, the spun yarn 10 does not pass through the yarn detecting device 60. The yarn detecting device 60 detects that the yarn 10 is not spun on the yarn path, and transmits a detection signal indicating that the yarn 10 is not spun to the control section 90. The control section 90 stops the rotation of the package 70 when receiving the detection signal from the yarn detecting device 60.

In this way, by using the air jet device 61, it is possible to immediately detect that the yarn end a has been separated from the yarn accumulating device 5 and pulled out from the yarn trap 41, and the first low-speed winding by the winding device 7 can be stopped in a state where the second catching guide device 16 catches the yarn end a at the second yarn catching position. That is, the yarn end a can be prevented from being wound into the package 70. Thus, the second yarn can be easily caught by the second catching guide device 16 without the yarn end a being entangled with the yarn layer of the package 70.

Thereafter, the control unit 90 moves the second catching guide device 16 to the second yarn catching position shown by the solid line in fig. 8 to catch the yarn end a. After the yarn end a is caught by the second catching guide device 16, the control section 90 closes the air injection valve 98 to stop the injection of the compressed air by the air injection device 61.

Next, the control section 90 moves the second catching guide device 16 to the yarn splicing position shown by the solid line in fig. 9 while rotating the package 70 in the reverse direction. Thereby, the second yarn caught by the second catching guide device 16 is guided to the yarn joining device 6.

Instead of moving the second catching guide device 16 to the yarn splicing position, the second catching guide device 16 may be moved to the standby position indicated by the broken line in fig. 9 once, and may be moved to the yarn splicing position after the package 70 is completely reversed. The standby position can be set appropriately so that the spun yarn 10 can pass through the yarn detecting device 60 without coming into contact with the nozzle of the yarn splicing device 6 or the like. This prevents the spun yarn 10 from being caught by the yarn joining device 6 during the reverse rotation of the package 70.

As shown in fig. 9, the spun yarn 10 is guided by the second catching guide device 16 and passes through the yarn detecting device 60, and the presence or absence of the spun yarn 10 can be detected by the yarn detecting device 60.

Based on the detection result of the yarn detecting device 60, it can be easily determined whether or not the yarn end a is successfully caught by the second catching guide device 16. Specifically, the control unit 90 determines that the second yarn is successfully caught by the second catching guide device 16 when the spun yarn 10 is detected by the yarn detecting device 60 after the second catching guide device 16 is moved to the yarn splicing position, and determines that the second yarn is not successfully caught by the second catching guide device 16 when the spun yarn 10 cannot be detected by the yarn detecting device 60. The control unit 90 interrupts the yarn joining operation when the second yarn catching by the second catching guide device 16 fails.

When the control section 90 determines that the second yarn catching by the second catching guide device 16 has succeeded, the control section 90 stops the reverse rotation of the winding drum 72 (the winding drum motor 72 a) and stops the reverse rotation of the package 70 after the spun yarn 10 of the predetermined length is unwound from the package 70. The predetermined length is appropriately set based on the thickness of the spun yarn 10, the reverse rotation speed of the package 70, and the like so that the short defect S can be removed by the second catching guide device 16. However, the present invention is not limited to this, and for example, the spun yarn 10 may be monitored by the yarn detecting device 60, and the control section 90 may stop the reverse rotation of the package 70 after the yarn detecting device 60 detects that the short defect S has passed.

In this way, in the step of guiding the second yarn from the package 70 to the yarn joining device 6, the second catching guide device 16 removes the short defect S included in the caught spun yarn 10. Thus, a step for removing the short defect S is not required, and the time of the yarn joining cycle can be shortened.

After the reverse rotation of the package 70 is stopped, the control section 90 opens the spinning valve 92 to start the spun yarn discharge by the air spinning device 3, and rotates the rollers of the draft device 2 at the rotation speed corresponding to the spun yarn discharge.

After the spun yarn 10 produced by the spun yarn detection device 30 detects the spun yarn, the control section 90 moves the first catching guide device 15 to the yarn joining position shown by the solid line in fig. 9 when a predetermined spun yarn spinning time has elapsed. Thereby, the first yarn caught by the first catching guide device 15 is guided to the yarn joining device 6. The predetermined yarn discharging and spinning time can be set as appropriate so that the first catching guide device 15 can catch the first yarn. For example, the following configuration is also possible: a yarn detection sensor, not shown, is provided inside the first catching guide device 15, and the first catching guide device 15 is moved at a point of time when the yarn detection sensor detects the first yarn.

The controller 90 operates the second guide motor 95 to move the second guide 12 to the standby position shown by the solid line in fig. 9 before starting the movement of the first catching guide 15.

While the first catching guide device 15 is moving from the first yarn catching position to the yarn splicing position, the control section 90 moves the first guide 11 to the guide position shown by the solid line in fig. 9, and at the same time or after that, returns the second guide 12 to the operation position shown by the alternate long and short dash line in fig. 9, whereby the spun yarn 10 is caught by the yarn catching member 53, and the storage of the spun yarn 10 into the yarn accumulating roller 51 is started. The control section 90 starts rotation of the yarn accumulating roller 51 at an appropriate timing so as to rotate at a rotation speed corresponding to the spun yarn at a time point when the first catching guide device 15 moves to the yarn splicing position.

At the same time or thereafter, as shown in fig. 9, the control section 90 rotates the yarn escape guide 14 from the standby position (chain line) to the operating position (solid line). Thereby, the spun yarn 10 is released from the yarn hooking member 53 of the yarn accumulating device 5, and is sucked by the first catching guide device 15 without being accumulated in the yarn accumulating roller 51.

At the same time, the control section 90 starts the normal spinning of the air spinning device 3 and rotates the rollers of the draft device 2 at the rotation speed during the normal spinning.

After a predetermined normal spinning time has elapsed from the start of normal spinning by the air spinning device 3, the control section 90 returns the yarn escape guide 14 to the standby position, and restarts the storage of the spun yarn 10 by the yarn storage device 5. At the same time, the yarn joining by the yarn joining device 6 is started.

After the completion of the yarn joining in the yarn joining device 6, the control section 90 starts the second low-speed winding in the winding device 7 and starts the injection of the compressed air by the air injection device 61 to determine whether the yarn joining is successful. The second low-speed winding means that the package 70 is rotated at a second low speed (for example, 10 to 20 m/min) and the spun yarn 10 is wound at a low speed.

When the yarn joining fails, the spun yarn 10 in the cut state is blown off by the air jet device 61, and therefore the spun yarn 10 is separated from the yarn detecting device 60. Therefore, the yarn detecting device 60 detects that the yarn 10 is not spun on the yarn path, and transmits a detection signal to the control section 90. In this case, the control section 90 determines that the yarn splicing has failed, and stops the draft operation of the draft device 2, the spinning operation of the air spinning device 3, and the second low-speed winding of the winding device 7. Then, as shown in fig. 13, the control unit 90 continues the injection of the compressed air by the air injection device 61 for a predetermined time. While the compressed air continues to be injected, the control section 90 slightly reverses the winding drum 72 to unwind the spun yarn 10 from the package 70 so as to lengthen the spun yarn 10 between the winding device 7 and the yarn joining device 6. The predetermined time for injecting the compressed air is set as appropriate so that the torque inherent to the spun yarn 10 can be eliminated. This makes it possible to stabilize the operation of the yarn end in the subsequent yarn joining or the like.

After the predetermined time has elapsed, the control unit 90 once stops the operation of the air jet device 61, moves the second catching guide device 16 to the second yarn catching position, and restarts the yarn joining. While the second yarn is caught by the second catching guide device 16, the air jet device 61 is intermittently operated. The time interval at which the air jet device 61 intermittently operates is set as appropriate so as to maintain a state in which the second yarn can be caught by the second catching guide device 16. This allows the second yarn to be caught by the second catching guide device 16, and reduces the consumption of compressed air.

In the case where the yarn joining is successful, the spun yarn 10 is detected by the yarn detecting device 60 without being affected by the injection of the compressed air by the air injecting device 61. In this case, the control unit 90 determines that the yarn joining is successful, accelerates the bobbin motor 72a to the normal winding speed, and restarts the normal winding by the winding device 7.

The predetermined amount of the spun yarn 10 including the short defect S is cut by the cutter provided in the yarn joining device 6, and is sucked and removed by the second catching guide device 16 as shown in fig. 9.

Next, a flow of yarn joining performed when the yarn monitoring device 4 detects the long defect L will be described in detail with reference to fig. 10 to 12. In the following description, only operations different from the case where the short defect S is detected will be described, and the description of the same operations as those in the case where the short defect S is detected will be omitted.

When the yarn monitoring device 4 detects the long defect L, the control section 90 immediately closes the spinning valve 92 and stops the rotation of the draft motor 91. As shown in fig. 10, the spun yarn 10 located on the upstream side of the accumulated yarn detecting device 50 is cut by the stop of the spinning. Thereby, a yarn end C is generated on the upstream side of the spun yarn 10 accumulated in the yarn accumulating device 5.

As shown in fig. 10, the control unit 90 stops the winding by the winding device 7 in a state where at least a part of the long defect L is accumulated by the yarn accumulating device 5 at a timing earlier than the case where the short defect S is detected. For example, the control section 90 can stop the winding of the winding device 7 simultaneously with the spinning stop. In this case, the spun yarn 10 can be wound to some extent due to a time lag from the stop of the winding device 7 to the complete stop of the winding. However, the present invention is not limited to this, and the control section 90 may stop the winding of the winding device 7 after a predetermined time has elapsed after the spinning valve 92 is closed.

Here, it is preferable to stop the winding by the winding device 7 in a state where all or most of the long defects L are accumulated by the yarn accumulating device 5. This can prevent a large number of long defects L from being wound into the package 70. In other words, the spun yarn 10 unwound from the package 70 to remove the long defect L may have a short length. Therefore, the time of the yarn joining cycle can be shortened.

Further, the control section 90 stops the storage of the spun yarn 10 by the yarn storage device 5 after the rotation of the package 70 is stopped, as in the case of the shortage defect S. After the rotation of the yarn accumulating roller 51 is stopped, the control section 90 generates a suction air flow at the tip end of the yarn suction device 54 to suck and catch the yarn end C. At the same time or after that, the control section 90 reverses the accumulating motor 52, and reverses the yarn accumulating roller 51 by 1.5 to 2 revolutions as shown in fig. 2.

At the same time or thereafter, as shown in fig. 11, the control section 90 operates the yarn joining device 6 to cut the spun yarn 10 using the cutter provided in the yarn joining device 6 in a state where the spun yarn 10 is held by the yarn joining device 6. Thereby, two yarn ends are produced. In the following description, the yarn end on the side of the yarn accumulating device 5 (the yarn end on the downstream side of the spun yarn 10 accumulated in the yarn accumulating device 5) is referred to as a yarn end D, and the yarn end on the side of the winding device 7 (the yarn end of the spun yarn 10 wound around the package 70) is referred to as a yarn end E.

As shown in fig. 11, the yarn end D is attracted and caught by the yarn catcher 41, and the yarn end E is held by the yarn joining device 6.

After that, the control section 90 reverses the yarn accumulating roller 51. At this time, the yarn end D attracted by the yarn trap 41 in fig. 11 is pulled out from the yarn trap 41 by the movement of the yarn escape guide 14 to the operation position shown by the solid line in fig. 9. The spun yarn 10 including the long defect L is unwound from the yarn accumulating roller 51 and is sucked and removed by the yarn suction device 54. When the stored yarn detecting device 50 continues to detect the spun yarn 10 even if the predetermined time has elapsed since the yarn storage roller 51 started to reverse, the control section 90 determines that unwinding has failed and interrupts the yarn joining.

At the same time or thereafter, as shown in the timing chart of fig. 12, the control section 90 starts the injection of the compressed air by the air injection device 61 in a state where the yarn joining device 6 holds the yarn end E. While the air jet device 61 is jetting the compressed air, the control section 90 slightly reverses the winding drum 72 to unwind a small amount of the spun yarn 10 from the package 70 in order to relax the spun yarn 10 between the yarn joining device 6 and the winding device 7. This can relax the tension of the spun yarn 10 and avoid the yarn 10 from being disturbed.

The control section 90 operates the yarn joining device 6 to release the yarn end E after the start of the injection of the compressed air by the air injection device 61. When the yarn end E is released, the air jet device 61 blows off and the yarn end E is caught by the yarn restricting guide 62 (see fig. 8).

After the yarn joining device 6 operates to release the yarn end E, the control section 90 moves the second catching guide device 16 to the second yarn catching position as shown in fig. 8. As shown in fig. 12, the control unit 90 stops the air jet device 61 once while the second yarn catching guide device 16 moves to the second yarn catching position, and restarts the injection of the compressed air by the air jet device 61 after the second yarn catching guide device 16 reaches the second yarn catching position. The zero point correction of the yarn detecting device 60 is performed at an appropriate timing after the compressed air injection. The operations of capturing the first yarn by the first capturing guide device 15, capturing the second yarn by the second capturing guide device 16, guiding the yarn to the yarn splicing device 6, splicing the yarn, and the like are the same as those in the case of detecting the short defect S, and therefore, the description thereof is omitted.

The winding of the spun yarn 10 may be started again after the long defect L is removed and the yarn is spliced. Alternatively, an alarm may be issued after the long defect L is removed, and the operator may be notified of the occurrence of the long defect L.

As described above, the spinning machine of the present embodiment includes the air spinning device 3, the yarn accumulating roller 51, the winding device 7, the yarn monitoring device 4, and the control unit 90. The air spinning device 3 twists the fiber bundle 9 with a swirling air flow to generate a spun yarn 10. The yarn accumulating roller 51 accumulates the spun yarn 10. The winding device 7 winds the spun yarn 10 accumulated on the yarn accumulation roller 51 to form a package 70. The yarn monitoring device 4 is disposed between the air spinning device 3 and the yarn accumulating roller 51, and can detect the long defect L and the short defect S of the spun yarn 10. When the yarn monitoring device 4 detects the long defect L in the spun yarn 10, the control section 90 stops the rotation of the package 70 to interrupt the winding of the spun yarn 10 by the winding device 7 in a state where at least a part of the long defect L is accumulated in the yarn accumulating roller 51.

Accordingly, the long defect L can be prevented from being wound in the package 70, and the spun yarn 10 unwound from the package 70 only needs to have a short length, so that the yarn end amount can be reduced, and the time of the yarn joining cycle can also be shortened. By disposing the yarn monitoring device 4 at a position where the travel of the spun yarn 10 is relatively stable, the measurement accuracy of the yarn monitoring device 4 can be maintained at a high level.

When the yarn monitoring device 4 detects the short defect S in the spun yarn 10, the control unit 90 of the spinning machine according to the present embodiment stops the rotation of the package 70 so that the short defect S is located downstream of the yarn accumulating roller 51 in the traveling direction of the spun yarn 10.

Accordingly, since the normal yarn accumulated in the yarn accumulating roller 51 is wound into the package 70 before the short defect S is detected, the amount of yarn ends can be reduced even when the short defect S is removed, and the time of the yarn joining cycle can be shortened.

When the yarn monitoring device 4 detects a long defect or a short defect in the spun yarn 10, the control unit 90 of the spinning machine of the present embodiment interrupts the production of the spun yarn 10 by the air spinning device 3, and produces a yarn end C (fig. 10) or a yarn end a (fig. 5) of the spun yarn 10 wound in the package 70.

Thus, when a yarn defect is detected, the generation of the spun yarn 10 is interrupted, thereby avoiding the useless generation of the spun yarn 10. Further, since the spun yarn 10 is cut by stopping the spinning, a device for cutting the spun yarn 10 does not need to be separately provided. Therefore, the structure can be simplified.

The spinning machine of the present embodiment includes a yarn suction device 54 that is disposed in the vicinity of the yarn accumulating roller 51 and removes the long defect L included in the spun yarn 10.

This makes it possible to easily remove the long defect L accumulated in the yarn accumulating roller 51.

In the spinning machine of the present embodiment, the yarn suction device 54 includes a hollow tube and a yarn suction valve 54a. The hollow tube is connected with a negative pressure source. The yarn suction valve 54a is opened to pass the suction air flow flowing through the hollow tube, and is closed to block the suction air flow.

This enables the long defect L to be removed by the suction air flow. Further, the operation and the stop of the operation of the yarn suction device 54 can be substantially switched with a simple configuration using the yarn suction valve 54a.

The control section 90 of the spinning machine according to the present embodiment reverses the yarn accumulating roller 51 after the rotation of the yarn accumulating roller 51 is stopped, at the same time as opening the yarn suction valve 54a or after opening the yarn suction valve 54a.

This makes it easy to catch the long defect L by the yarn suction device 54, and the long defect L can be removed quickly.

The spinning machine of the present embodiment includes the second catching guide device 16 which is rotatably disposed on the downstream side of the yarn accumulating roller 51 and removes the shortage S included in the spun yarn 10.

Thus, when the rotation of the package 70 is stopped at the timing at which the shortage S is arranged on the downstream side of the yarn accumulating roller 51, the shortage S can be easily removed by the second catching guide device 16.

The second catching and guiding device 16 of the spinning machine according to the present embodiment removes the short defect S included in the spun yarn 10 in the step of catching the spun yarn 10 from the package 70 and guiding the same to the yarn joining device 6.

Thus, the step of removing the short defect S can be omitted, and the time of the yarn splicing cycle can be shortened. Further, the second catching guide device 16 can be used as a device for guiding the spun yarn 10 to the yarn joining device 6. Therefore, the structure can be simplified.

The control section 90 of the spinning machine according to the present embodiment stops the rotation of the yarn accumulating roller 51 after the rotation of the package 70 is stopped.

The yarn end a (C) of the spun yarn 10 cut at the upstream side of the yarn accumulating roller 51 slightly swings while being slightly separated from the outer peripheral surface of the yarn accumulating roller 51 by centrifugal force after being wound around the rotating yarn accumulating roller 51. By continuing this state for a long time, the yarn end a (C) can be prevented from being entangled with the yarn layer accumulated in the yarn accumulating roller 51.

The spinning machine of the present embodiment includes a stored yarn detecting device 50 that detects whether or not the spun yarn 10 stored in the yarn storage roller 51 is present. When the yarn monitoring device 4 detects the short defect S, the control section 90 stops the rotation of the package 70 with a time difference (with a fixed time interval) after the yarn accumulating device 50 detects that the spun yarn 10 is not accumulated on the yarn accumulating roller 51.

Thus, the short defect S can be positioned downstream of the yarn accumulating roller 51 when the rotation of the package 70 is stopped.

The spinning machine of the present embodiment includes a yarn detection device 60 and an air injection device 61. The yarn detecting device 60 is disposed between the yarn accumulating roller 51 and the winding device 7, and detects the presence or absence of the spun yarn 10 in a yarn path in which the spun yarn 10 travels. The air injection device 61 is disposed between the yarn accumulating roller 51 and the winding device 7, and injects compressed air to the yarn path. After the spinning by the air spinning device 3 is interrupted, the control section 90 performs the air injection by the air injection device 61 while rotating the package 70 in the winding direction in which the spun yarn 10 is wound. When the air jet device 61 jets compressed air into the yarn path, the control section 90 stops the rotation of the package 70 when the yarn detection device 60 detects that the spun yarn 10 is not present in the yarn path.

This makes it possible to quickly and reliably detect that the yarn end a of the spun yarn 10 cut on the upstream side of the yarn accumulating roller 51 has separated from the yarn accumulating roller 51.

The yarn accumulating roller 51 of the spinning machine of the present embodiment has an accumulating portion 51a having a diameter of 70mm to 110 mm.

Accordingly, the winding of the package 70 can be stopped in a state where the long defect L is surely left in the yarn accumulating roller 51, and the processing time required for removing the long defect L can be shortened.

The yarn accumulating roller 51 of the spinning machine of the present embodiment can accumulate the spun yarn 10 of 10m or more.

Thus, even with a long defect L of 10m or more, the winding of the package 70 can be stopped with the long defect L remaining on the yarn accumulating roller 51.

While the preferred embodiments of the present invention have been described above, the above configuration can be modified as described below, for example.

The operations of the respective portions shown in the timing chart of fig. 12 can be performed even when the short defect S is detected.

The operations of the respective portions shown in the timing chart of fig. 12 may be performed only when the yarn splicing fails.

When it is determined that the yarn joining has failed, the operation of the yarn end a (E) can be stabilized during the reverse rotation of the package 70 without continuing the operation of the air jet device 61, and the yarn end a (E) can be held by, for example, a clip not shown. Alternatively, the operation of the air jet device 61 may not be continued and the yarn end a (E) may not be held by a clamp or the like.

The air jet device 61 and the yarn restricting guide 62 may be disposed not on the main guide 64 but on the upstream side of the winding drum 72 and at another position where the second yarn can be caught by the second catching guide 16.

The air injection device 61 may have only one nozzle.

The spun yarn 10 from the yarn end D to the yarn end C including the long defect L can be sucked and removed by the yarn trap 41 instead of the yarn sucking device 54. In this case, the control section 90 closes the yarn suction valve 54a to stop the operation of the yarn suction device 54, and rotates the yarn accumulating roller 51 in the normal direction. The yarn trap 41 may also be omitted.

Instead of the above-described configuration, the air spinning device 3 may include a pair of air nozzles that twist the fiber bundle in opposite directions. The spinning unit 100 may be provided with an open-end spinning device (rotary spinning device) instead of the draft device 2 and the air spinning device 3.

A pair of draw-off rollers may be provided between the air spinning device 3 and the yarn accumulating device 5, and the spun yarn 10 may be drawn out from the air spinning device 3 by the pair of draw-off rollers. In this case, one roller of the pair of draw rollers is independently rotationally driven with respect to the rollers of the other spinning units 100, so that the roller can be independently rotationally driven in the spinning unit 100 that performs the yarn joining. When the winding of the package 70 is interrupted, the pair of draw rollers stops rotating in synchronization with the package 70.

Instead of the splicer device, the knotter, or the like, the spun yarn 10 may be made continuous by piecing. The linker means the following method: after the spun yarn 10 from the package 70 is returned to the air spinning device 3, the draft by the draft device 2 and the spinning by the air spinning device 3 are resumed, and the spun yarn 10 is in a continuous state.

When the short defect S is detected, the winding of the package 70 may be decelerated to the first low speed to gradually wind the generated yarn end a, instead of stopping the winding of the package 70. In this case, the yarn accumulating roller 51 may continue its rotation as it is or may decelerate, or may be stopped once and reversed by 1.5 to 2 revolutions as described above.

In addition to the accumulated yarn detecting device 50, a second accumulated yarn detecting device may be provided on the base end side of the accumulation portion 51a of the yarn accumulating roller 51 (upstream side on which the spun yarn 10 travels). Thus, when the spun yarn 10 including the long defect L wound around the yarn accumulating roller 51 is unwound and sucked and removed by the yarn suction device 54, the success or failure of the unwinding of the spun yarn 10 can be determined more accurately based on the detection result of the second accumulated yarn detection device. In addition, instead of a part or all of the detecting operation of the accumulated yarn detecting device 50 at the time of yarn splicing, the detecting operation by the second accumulated yarn detecting device can be performed. That is, the control unit 90 may use the detection result of the second accumulated yarn detecting device in place of a part or all of the detection result of the accumulated yarn detecting device 50 at the time of yarn splicing.

In the spinning unit 100, each device may be arranged such that the spun yarn 10 supplied from above is wound on the lower side in the height direction.

The yarn splicing device 6 may be provided on a work vehicle movably provided with respect to the plurality of spinning units 100. In this configuration, when the spun yarn 10 is cut between the package 70 and the yarn accumulating device 5, the spun yarn 10 is cut by a cutter provided in the work carriage, a cutter of the yarn joining device 6, or a cutter provided in each spinning unit 100.

The winding drums 72 of the plurality of spinning units 100 may be driven by one driving motor. When the winding of the package 70 is interrupted, the rotation of the package 70 may be stopped by a brake mechanism, not shown, while the package 70 is moved away from the winding drum 72. After the spun yarn 10 is cut between the package 70 and the yarn accumulating device 5, the spun yarn 10 connected to the package 70 may be wound into the package 70 by bringing the package 70 into contact with the winding drum 72. Thereafter, the package 70 is separated from the winding drum 72 again for the yarn joining.

The structure for avoiding the spun yarn 10 from being caught by the yarn catching member 53 when the spun yarn 10 is removed from the yarn accumulating roller 51 is not limited to the structure of the above-described embodiment. For example, the yarn accumulating device 5 may be provided with a yarn escape lever and the yarn escape lever may be operated to prevent the spun yarn 10 from being caught by the yarn catching member 53.

Claims

1. An air spinning machine is characterized by comprising:

an air spinning device for twisting a fiber bundle by a swirling air flow to generate a spun yarn;

a yarn accumulating roller that accumulates the spun yarn;

a winding device that winds the spun yarn accumulated in the yarn accumulating roller to form a package;

a yarn monitoring device which is disposed between the air spinning device and the yarn accumulating roller and can detect a long defect and a short defect of the spun yarn; and

a control unit that stops rotation of the package to interrupt winding of the spun yarn by the winding device in a state where at least a part of the long defect is accumulated in the yarn accumulating roller when the long defect is detected in the spun yarn by the yarn monitoring device,

the control unit stops the rotation of the package such that the short defect is located downstream of the yarn accumulating roller in a traveling direction of the spun yarn when the short defect is detected in the spun yarn by the yarn monitoring device.

2. Air spinning machine according to claim 1,

the control unit interrupts the generation of the spun yarn by the air spinning device and generates a yarn end of the spun yarn wound in the package when the yarn monitoring device detects the long defect or the short defect in the spun yarn.

3. Air spinning machine according to claim 1,

the yarn accumulating roller is provided with a first removing device which is arranged near the yarn accumulating roller and removes long defects contained in the spun yarn.

4. Air spinning machine according to claim 2,

5. Air spinning machine according to claim 3,

the first removing device includes:

a hollow tube connected to a negative pressure source; and

and an opening/closing member that is opened to allow the suction air flow flowing through the hollow tube to pass therethrough and is closed to block the suction air flow.

6. Air spinning machine according to claim 4,

the first removing device includes:

a hollow tube connected to a negative pressure source; and

7. Air spinning machine according to claim 5,

the control unit may reverse the yarn accumulating roller at the same time as or after the opening/closing member is opened after the rotation of the yarn accumulating roller is stopped.

8. Air spinning machine according to claim 6,

the control unit reverses the yarn accumulating roller at the same time as or after the opening/closing member is opened after the rotation of the yarn accumulating roller is stopped.

9. Air spinning machine according to one of claims 1 to 8,

the spinning device includes a second removing device that is rotatably disposed on a downstream side of the yarn accumulating roller and removes the shortage of the spun yarn.

10. Air spinning machine according to claim 9,

the second removing device removes the short defect included in the spun yarn in a step of catching the spun yarn from the package and guiding the spun yarn to a yarn joining device.

11. An air spinning machine according to any one of claims 1-8, 10,

the control section stops the rotation of the yarn accumulating roller after the rotation of the package is stopped.

12. Air spinning machine according to claim 9,

the control unit stops the rotation of the yarn accumulating roller after the rotation of the package is stopped.

13. An air spinning machine according to any one of claims 1-8, 10, 12,

a stored yarn detecting device for detecting whether or not the spun yarn is stored in the yarn storage roller,

the control unit stops the rotation of the package at a predetermined time interval after the yarn accumulation detecting device detects that the spun yarn is not accumulated on the yarn accumulation roller when the yarn monitoring device detects the short defect.

14. Air spinning machine according to claim 9,

the control unit stops the rotation of the package at a predetermined time interval after the yarn accumulating detection unit detects that the spun yarn is not accumulated on the yarn accumulating roller when the yarn monitoring unit detects the short defect.

15. Air spinning machine according to claim 11,

a stored yarn detecting device for detecting whether or not the spun yarn stored in the yarn storage roller is present,

16. An air spinning machine according to any one of claims 1 to 8, 10, 12, 14, and 15, comprising:

a yarn detecting device that is disposed between the yarn accumulating roller and the winding device and detects the presence or absence of the spun yarn in a yarn path in which the spun yarn travels; and

an air injection device disposed between the yarn accumulating roller and the winding device and injecting air to the yarn path,

the control unit performs air injection by the air injection device while rotating the package in a winding direction in which the spun yarn is wound, after generation of the spun yarn by the air spinning device is interrupted,

when the yarn detecting device detects that the spun yarn is not present in the yarn path when the air injecting device injects air into the yarn path, the control unit stops the rotation of the package.

17. The air spinning machine according to claim 9, comprising:

an air injection device which is arranged between the yarn accumulating roller and the winding device and injects air to the yarn path,

18. The air spinning machine according to claim 11, comprising:

19. The air spinning machine according to claim 13, characterized by comprising:

20. Air spinning machine according to any one of claims 1-8, 10, 12, 14, 15, 17-19,

the yarn accumulating roller has an accumulating portion having a diameter of 70mm to 110 mm.

21. Air spinning machine according to claim 9,

22. Air spinning machine according to claim 11,

23. Air spinning machine according to claim 13,

24. Air spinning machine according to claim 16,

25. An air spinning machine according to any one of claims 1-8, 10, 12, 14, 15, 17-19, 21-24,

the yarn accumulating roller can accumulate the spun yarn of 10m or more.

26. Air spinning machine according to claim 9,

the yarn accumulating roller can accumulate the spun yarn of 10m or more.

27. Air spinning machine according to claim 11,

the yarn accumulating roller can accumulate the spun yarn of 10m or more.

28. Air spinning machine according to claim 13,

the yarn accumulating roller can accumulate the spun yarn of 10m or more.

29. Air spinning machine according to claim 16,

the yarn accumulating roller can accumulate the spun yarn of 10m or more.

30. Air spinning machine according to claim 20,

the yarn accumulating roller can accumulate the spun yarn of 10m or more.

31. An air spinning method, comprising:

an air spinning step of twisting the fiber bundle by a whirling air flow in an air spinning device to produce a spun yarn;

a yarn accumulating step of accumulating the spun yarn by a yarn accumulating roller;

a winding step of winding the spun yarn accumulated in the yarn accumulating roller to form a package;

a yarn monitoring step of detecting a long defect and a short defect of the spun yarn between the air spinning device and the yarn accumulating roller; and

and a control step of stopping rotation of the package to interrupt winding of the spun yarn by the winding step in a state where at least a part of the long defect is accumulated on the yarn accumulation roller when the long defect is detected in the spun yarn, and stopping rotation of the package so that the short defect is positioned downstream of the yarn accumulation roller in a traveling direction of the spun yarn when the short defect is detected in the spun yarn.