JP2024109322A - Spinning machine and spinning method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spinning machine and a spinning method, capable of achieving reduction of amounts of waste threads generated on yarn pick-up spinning.

SOLUTION: A spinning machine 1 includes a draft machine 6, an air spinning device 7, and a unit controller 10. In the draft machine 6, a draft ratio of a front roller pair 17 to a middle roller pair 16 is MDR, a draft ratio of a middle roller pair 16 to a third roller pair 15 is IDR, and a draft ratio of a third roller pair 15 to a back roller pair 14 is BDR. The unit controller 10 controls respective rotation driving of the back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17 in a manner that IDR and BDR on yarn pick-up spinning become the same ratio as that on ordinary spinning.

SELECTED DRAWING: Figure 2

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a spinning machine and a spinning method.

The spinning machine includes a drafting device that drafts a fiber bundle, and an air spinning device that twists the drafted fiber bundle with a swirling air flow to produce yarn. The drafting device includes a first roller pair arranged at the most downstream side in the running direction of the fiber bundle, a second roller pair arranged upstream in the running direction from the first roller pair, a third roller pair arranged upstream in the running direction from the second roller pair, and a fourth roller pair arranged upstream in the running direction from the third roller pair. In the spinning machine described in Patent Document 1, the peripheral speed of the first roller pair during yarn discharge spinning is set lower than the peripheral speed of the first roller pair during normal spinning performed after yarn discharge spinning.

JP 2016-23391 A

In a spinning machine, in the yarn discharge spinning for starting normal spinning in the air spinning device, in order to increase the success rate of capturing the fiber bundle by the air spinning device, as described above, the peripheral speed of the first roller pair during yarn discharge spinning is set lower than the peripheral speed of the first roller pair during normal spinning. Also, in a spinning machine, in order to increase the success rate of capturing the fiber bundle by the air spinning device during yarn discharge spinning, there is a method of changing the yarn count (making it thicker or thinner). With this method, it is necessary to remove all the yarn (waste yarn) generated to have the changed count during yarn discharge spinning before starting normal spinning.

One aspect of the present invention aims to provide a spinning machine and spinning method that can reduce the amount of waste yarn generated during yarn discharge spinning.

A spinning machine according to one aspect of the present invention includes a drafting device that drafts a fiber bundle, an air spinning device that twists the drafted fiber bundle with a swirling air flow to produce yarn, and a control device that controls the operation of the drafting device. The drafting device has a first roller pair arranged at the most downstream side in the running direction of the fiber bundle, a second roller pair arranged upstream in the running direction from the first roller pair, a third roller pair arranged upstream in the running direction from the second roller pair, and a fourth roller pair arranged upstream in the running direction from the third roller pair. In the drafting device, the draft ratio of the first roller pair to the second roller pair is a first ratio, the draft ratio of the second roller pair to the third roller pair is a second ratio, and the draft ratio of the third roller pair to the fourth roller pair is a third ratio. The control device controls the rotational drive of each of the first roller pair, the second roller pair, the third roller pair, and the fourth roller pair so that the second ratio and the third ratio are the same ratios as those during normal spinning during yarn discharge spinning to start normal spinning in the air spinning device.

In a spinning machine according to one aspect of the present invention, the count of the fiber bundle is maintained between the second roller pair to the fourth roller pair during yarn discharge spinning and normal spinning. This allows the spinning machine to produce yarn using the fiber bundle that was between the second roller pair to the fourth roller pair during yarn discharge spinning. Therefore, the spinning machine can reduce the amount of waste yarn generated during yarn discharge spinning.

In one embodiment, the control device may control the rotational drive of each of the first roller pair and the second roller pair so that the first ratio is different between yarn discharge spinning and normal spinning. In this configuration, it is only necessary to remove the yarn generated from the fiber bundle that was between the first roller pair and the second roller pair before normal spinning began. Therefore, the spinning machine can reduce the amount of waste yarn generated during yarn discharge spinning.

In one embodiment, the control device may control the rotational drive of the first roller pair so that the peripheral speed of the first roller pair during yarn discharge spinning is lower than that during normal spinning. With this configuration, the yarn count during yarn discharge spinning can be made thicker with simple control, further increasing the success rate of capturing the fiber bundle by the air spinning device during yarn discharge spinning.

In one embodiment, the control device may control the rotational drive of the second roller pair, the third roller pair, and the fourth roller pair so that the peripheral speeds of the second roller pair, the third roller pair, and the fourth roller pair are lower during yarn discharge spinning than during normal spinning. In this configuration, the amount of fiber bundle consumed can be reduced.

In one embodiment, the control device may synchronously accelerate the second roller pair, the third roller pair, and the fourth roller pair to the circumferential speed during normal spinning after yarn discharge spinning. In this configuration, the second roller pair, the third roller pair, and the fourth roller pair are synchronously accelerated, so that the second ratio and the third ratio do not change when transitioning from yarn discharge spinning to normal spinning. In other words, the spinning machine can maintain the second ratio and the third ratio constant throughout the entire period during yarn discharge spinning, acceleration, and normal spinning. Therefore, yarn can be produced using the fiber bundle between the second roller pair to the fourth roller pair during yarn discharge spinning and acceleration without changing the count of the fiber bundle. Therefore, the amount of waste yarn can be reduced.

In one embodiment, if the width of the fiber bundle between the second roller pair and the third roller pair is the first width, and the width of the fiber bundle between the third roller pair and the fourth roller pair is the second width, the first width and the second width during yarn discharge spinning may be equivalent to the first width and the second width during normal spinning. In this configuration, the first width and the second width do not change during yarn discharge spinning and normal spinning, so the behavior of the fiber bundle in this area can be stabilized. As a result, for example, it is possible to prevent the fiber bundle from clogging the regulating section (condenser) arranged in this area.

In one embodiment, the spinning machine includes a winding device that winds the yarn to form a package, a yarn splicing device that splices a first yarn from the air spinning device and a second yarn from the package of the winding device, a first capture device that guides the first yarn to the yarn splicing device, and a second capture device that guides the second yarn to the yarn splicing device. After the yarn discharge spinning, the control device may accelerate each of the first roller pair, the second roller pair, the third roller pair, and the fourth roller pair to a peripheral speed during normal spinning, and when the first roller pair has completed acceleration to the peripheral speed during normal spinning, cause the yarn splicing device to perform yarn splicing. In the spinning machine, the fiber bundle count is changed between the first roller pair and the second roller pair, so that the yarn splicing device can perform yarn splicing when the first roller pair has accelerated to the peripheral speed during normal spinning. This allows the cycle time to be shortened.

In one embodiment, the control device may cause the yarn splicing device to start splicing after the yarn is guided to the yarn splicing device by the first and second capturing devices and a predetermined time has elapsed that is set based on the peripheral speed of the first roller pair during normal spinning. The predetermined time is the time required for the first capturing device to remove (suck up) the yarn that is generated during yarn discharge spinning to have a different count than during normal spinning. For example, the predetermined time is less than 1 second when the speed of the fiber bundle sent out from the draft device is 600 m/min. In other words, when the speed of the fiber bundle sent out from the draft device is 600 m/min, the yarn splicing device starts splicing less than 1 second after the first capturing device guides the yarn to the yarn splicing device. This allows the cycle time to be shortened.

A spinning method according to one aspect of the present invention is a spinning method in a spinning machine including a drafting device that drafts a fiber bundle, and an air spinning device that twists the drafted fiber bundle with a swirling air flow to produce yarn, the drafting device having a first roller pair arranged at the most downstream side in the running direction of the fiber bundle, a second roller pair arranged upstream in the running direction from the first roller pair, a third roller pair arranged upstream in the running direction from the second roller pair, and a fourth roller pair arranged upstream in the running direction from the third roller pair, the draft ratio of the first roller pair to the second roller pair in the drafting device is a first ratio, the draft ratio of the second roller pair to the third roller pair is a second ratio, and the draft ratio of the third roller pair to the fourth roller pair is a third ratio, and the rotational drive of each of the first roller pair, the second roller pair, the third roller pair, and the fourth roller pair is controlled so that during yarn discharge spinning to start normal spinning in the air spinning device, the second ratio and the third ratio are the same ratio as during normal spinning.

In the spinning method according to one aspect of the present invention, the count of the fiber bundle is maintained between the second roller pair and the fourth roller pair during yarn discharge spinning and during spinning operation. This allows the fiber bundle that was between the second roller pair and the fourth roller pair during yarn discharge spinning to be used to produce yarn. Therefore, the spinning method can reduce the amount of waste yarn generated during yarn discharge spinning.

According to one aspect of the present invention, it is possible to reduce the amount of waste yarn that occurs during yarn discharge spinning.

FIG. 1 is a front view showing a spinning machine according to one embodiment. FIG. 2 is a side view showing the spinning unit of FIG. FIG. 3 is a side view showing the draft device. FIG. 4 is a diagram for explaining the draft ratio. FIG. 5 is a cross-sectional view showing the internal structure of the air spinning device.

A preferred embodiment of the present invention will be described in detail below with reference to the attached drawings. In the description of the drawings, the same or equivalent elements are given the same reference numerals, and duplicate descriptions will be omitted.

As shown in FIG. 1, the spinning machine 1 includes multiple spinning units 2, a yarn splicing cart 3, a doffing cart (not shown), a first end frame 4, and a second end frame 5. The multiple spinning units 2 are arranged in a row. Each spinning unit 2 produces yarn Y and winds it into a package P. If the yarn Y is cut in a spinning unit 2 or is broken for some reason, the yarn splicing cart 3 performs a yarn splicing operation in that spinning unit 2. If the package P in a spinning unit 2 becomes full, the doffing cart doffs the package P and supplies a new bobbin B to that spinning unit 2.

The first end frame 4 houses a recovery device that recovers waste fiber and waste yarn generated in the spinning unit 2. The second end frame 5 houses an air supply unit that adjusts the pressure of the compressed air (air) supplied to the spinning machine 1 to supply air to each part of the spinning machine 1, and a drive motor that supplies power to each part of the spinning unit 2. The second end frame 5 is provided with a machine control device 5A, a display screen 5B, and input keys 5C. The machine control device 5A centrally manages and controls each part of the spinning machine 1. The display screen 5B can display information on the settings and status of the spinning unit 2. The operator can perform appropriate operations using the input keys 5C to perform setting work for the spinning unit 2.

As shown in Figures 1 and 2, each spinning unit 2 includes, in order from the upstream side in the running direction of the yarn Y, a draft device 6, an air spinning device 7, a yarn monitoring device 8, a tension sensor 9, a yarn storage device 11, a waxing device 12, and a winding device 13. A unit controller (control device) 10 is provided for each of a predetermined number of spinning units 2 and controls the operation of the spinning units 2.

The draft device 6 drafts the fiber bundle (sliver) S. The draft device 6 has, in order from the upstream side in the running direction of the fiber bundle S, a back roller pair (fourth roller pair) 14, a third roller pair (third roller pair) 15, a middle roller pair (second roller pair) 16, and a front roller pair (first roller pair) 17. In other words, in the draft device 6, the front roller pair 17, the middle roller pair 16, the third roller pair 15, and the back roller pair 14 are arranged in this order from the downstream side to the upstream side in the draft path of the fiber bundle S. The back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17 draft the fiber bundle S supplied from a can (not shown) and guided by a fiber bundle guide 36 (see FIG. 3) from the upstream side to the downstream side.

As shown in FIG. 3, the back roller pair 14 has a top roller 14a and a bottom roller 14b. The third roller pair 15 has a top roller 15a and a bottom roller 15b. The middle roller pair 16 has a top roller 16a and a bottom roller 16b. The front roller pair 17 has a top roller 17a and a bottom roller 17b. An apron belt 18a is provided for the top roller 16a of the middle roller pair 16. An apron belt 18b is provided for the bottom roller 16b of the middle roller pair 16. In this embodiment, the top rollers 14a, 15a, 16a, and 17a are driven rollers. The bottom rollers 14b, 15b, 16b, and 17b are drive rollers.

The draft device 6 has a first motor 32, a second motor 33, a third motor 34, and a fourth motor 35. The first motor 32 drives and rotates the bottom roller 14b of the back roller pair 14 via a belt B1. The second motor 33 drives and rotates the bottom roller 15b of the third roller pair 15 via a belt B2. The third motor 34 drives and rotates the bottom roller 16b of the middle roller pair 16 via a belt B3. The fourth motor 35 drives and rotates the bottom roller 17b of the front roller pair 17 via a belt B4. The operations of the first motor 32, the second motor 33, the third motor 34, and the fourth motor 35 are controlled by the unit controller 10.

The top roller 14a is arranged to rotate following the bottom roller 14b. The top roller 15a is arranged to rotate following the bottom roller 15b. The top roller 16a is arranged to rotate following the bottom roller 16b. The top roller 17a is arranged to rotate following the bottom roller 17b.

The draft device 6 is provided with a regulating section 37. The regulating section 37 is called, for example, a guide or a condenser. The regulating section 37 is disposed between the third roller pair 15 and the middle roller pair 16. The regulating section 37 regulates the path along which the fiber bundle S travels (for example, the width of the fiber bundle S in the direction of the rotation axis of the middle roller pair 16).

The draft device 6 drafts the fiber bundle S at a predetermined draft ratio and sends the fiber bundle S to the air spinning device 7. FIG. 4 is a diagram for explaining the draft ratio. The draft ratio is the ratio of the fiber amount or number of fibers in the fiber bundle S before and after it is processed by the back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17 in the draft device 6. In the draft device 6, the draft ratio can be changed by changing the peripheral speeds of the back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17.

There are three types of draft ratios: BDR (Brake Draft Ratio: third ratio), IDR (Intermediate Draft Ratio: second ratio), and MDR (Main Draft Ratio: first ratio).

BDR is the draft ratio of the third roller pair 15 to the back roller pair 14. BDR can also be said to be the ratio of the peripheral speed of the third roller pair 15 to the peripheral speed of the back roller pair 14. BDR is the ratio of the fiber amount or number of fibers in the fiber bundle S after it has been processed by the third roller pair 15 to the fiber amount or number of fibers in the fiber bundle S before it is introduced into the back roller pair 14. In the draft device 6, the BDR can be changed by changing the peripheral speed of at least one of the back roller pair 14 and the third roller pair 15.

The IDR is the draft ratio of the middle roller pair 16 to the third roller pair 15. The IDR can also be said to be the ratio of the peripheral speed of the middle roller pair 16 to the peripheral speed of the third roller pair 15. The IDR is the ratio of the fiber amount or number of fibers in the fiber bundle S after it has been processed by the middle roller pair 16 to the fiber amount or number of fibers in the fiber bundle S before it is introduced into the third roller pair 15. In the draft device 6, the IDR can be changed by changing the peripheral speed of at least one of the third roller pair 15 and the middle roller pair 16.

The MDR is the draft ratio of the front roller pair 17 to the middle roller pair 16. The MDR can also be said to be the ratio of the peripheral speed of the front roller pair 17 to the peripheral speed of the middle roller pair 16. The MDR is the ratio of the fiber amount or number of fibers in the fiber bundle S after it has been processed by the front roller pair 17 to the fiber amount or number of fibers in the fiber bundle S before it is introduced into the middle roller pair 16. In the draft device 6, the MDR can be changed by changing the peripheral speed of at least one of the middle roller pair 16 and the front roller pair 17.

In this embodiment, the BDR can be, for example, 1.5 times or more and 4.0 times or less. The IDR can be, for example, 1.2 times or more and 3.0 times or less. The MDR can be, for example, 15 times or more and 60 times or less. The settings of the draft device 6 (draft ratio, peripheral speed, etc.) can be set by operating the input keys 5C on the setting screen displayed on the display screen 5B of the machine control device 5A.

As shown in FIG. 2, the air spinning device 7 uses a swirling air flow to twist the fiber bundle (fiber) F drafted by the draft device 6 to produce yarn Y. As shown in FIG. 5, the air spinning device 7 has a nozzle block 40 and a hollow guide shaft 41. The nozzle block 40 has a fiber guide 42, a spinning chamber 43, and a first nozzle 44. The hollow guide shaft 41 has a yarn passage 45 and a second nozzle 46.

The fiber guide 42 guides the fiber bundle S drafted by the draft device 6 toward the inside of the air spinning device 7. The fiber guide 42 is provided with a fiber inlet 42a and a needle-shaped member 42b. The fiber bundle S drafted by the draft device 6 is introduced from the fiber inlet 42a and guided into the spinning chamber 43 so as to wrap around the needle-shaped member 42b. Air is sprayed into the spinning chamber 43 from the first nozzle 44, generating a swirling airflow in the spinning chamber 43. This causes the swirling airflow to act on the fiber bundle S in the spinning chamber 43.

The hollow guide shaft 41 is a cylindrical member, and has a thread passage 45 formed therein. Air is sprayed from the second nozzle 46 into the thread passage 45, generating a swirling airflow in the thread passage 45. The direction of the swirling airflow generated by the air sprayed from the second nozzle 46 is opposite to the swirling airflow generated by the air sprayed from the first nozzle 44.

When spinning is newly started, or when spinning is temporarily interrupted and then resumed due to yarn breakage or the like, that is, when it is necessary to send out new yarn Y from the air spinning device 7, the air spinning device 7 performs yarn output spinning. Yarn output spinning is an operation that the air spinning device 7 performs when starting normal spinning, and is a type of spinning that differs from normal spinning.

When performing yarn output spinning, air is sprayed from both the first nozzle 44 and the second nozzle 46 to generate a swirling air current. The fiber bundle S drafted by the draft device 6 is guided into the air spinning device 7 by the fiber guide 42. The air sprayed from the first nozzle 44 flows in the feed direction of the fiber bundle S while swirling. As a result, the fiber bundle S is sent to the hollow guide shaft 41 in a loosely twisted state.

The yarn passage 45 is formed so that the cross-sectional area on the downstream side is larger than the cross-sectional area on the upstream side, so that the swirling air flow in the yarn passage 45 flows toward the downstream side. This allows the fiber bundle S to be sent downstream of the yarn passage 45. The direction of the swirling air flow generated in the yarn passage 45 is opposite to the swirling air flow in the spinning chamber 43, so that the fiber bundle S is discharged from the hollow guide shaft 41 while being spun into a bundled fiber by a known spinning method.

During normal spinning, air is sprayed only from the first nozzle 44, generating a swirling air current in the spinning chamber 43. That is, when switching from yarn discharge spinning to normal spinning (at the time of transition), air is sprayed from the second nozzle 46, but during normal spinning, air is not sprayed from the second nozzle 46. The rear end of the fibers of the fiber bundle S supplied from the draft device 6 is swung around the tip of the hollow guide shaft 41 by the swirling air current generated in the spinning chamber 43. This adds twist to the fiber bundle S to generate the yarn Y. The yarn Y passes through the yarn passage 45 of the hollow guide shaft 41 and is sent out from the air spinning device 7 from a downstream yarn outlet (not shown).

As shown in FIG. 2, the yarn monitoring device 8 monitors information about the traveling yarn Y between the air spinning device 7 and the yarn storage device 11, and detects the presence or absence of a yarn defect based on the monitored information. If the yarn monitoring device 8 detects a yarn defect, it transmits a yarn defect detection signal to the unit controller 10. The yarn monitoring device 8 detects, for example, an abnormality in the thickness of the yarn Y and/or a foreign object contained in the yarn Y as a yarn defect.

The tension sensor 9 measures the tension of the traveling yarn Y between the air spinning device 7 and the yarn storage device 11, among the areas between the air spinning device 7 and the winding device 13, and transmits a tension measurement signal to the unit controller 10. If the unit controller 10 determines that there is an abnormality based on the detection results of the yarn monitoring device 8 and the tension sensor 9, the yarn Y is cut in the spinning unit 2. Specifically, the supply of air to the air spinning device 7 is stopped and the production of the yarn Y is interrupted, thereby cutting the yarn Y. Alternatively, the yarn Y may be cut by a separately provided cutter. At this time, the draft by the draft device 6 is also stopped.

The waxing device 12 applies wax to the yarn Y between the yarn storage device 11 and the winding device 13.

The yarn pooling device 11 removes slack in the yarn Y between the air spinning device 7 and the winding device 13. The yarn pooling device 11 has the functions of stably drawing out the yarn Y from the air spinning device 7, retaining the yarn Y sent out from the air spinning device 7 during the yarn joining operation by the yarn joining cart 3, and preventing the yarn Y from slackening, and preventing fluctuations in the tension of the yarn Y downstream of the yarn pooling device 11 from being transmitted to the air spinning device 7.

The winding device 13 winds the generated yarn Y onto a bobbin B to form a package P. The winding device 13 has a cradle arm 21, a winding drum 22, and a traverse guide 23. The cradle arm 21 rotatably supports the bobbin B. The cradle arm 21 is supported by a support shaft 24 so that 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 drive motor (not shown) provided on the second end frame 5 drives the winding drums 22 of the multiple spinning units 2 simultaneously. As a result, the bobbin B or package P is rotated in the winding direction in each spinning unit 2. The traverse guide 23 of each spinning unit 2 is provided on a shaft 25 shared by the multiple spinning units 2. The drive motor of the second end frame 5 reciprocates the shaft 25 in the direction of the rotation axis of the winding drum 22, causing the traverse guide 23 to traverse the yarn Y at a predetermined width relative to the rotating bobbin B or package P. Note that a motor for driving each winding drum 22 and a motor for driving each traverse guide 23 may be provided in each winding device 13. In this case, the drive motor of the second end frame 5 may be omitted.

When the yarn Y is cut in a spinning unit 2 or broken for some reason, the yarn splicing cart 3 travels to that spinning unit 2 and performs a yarn splicing operation. The yarn splicing cart 3 has a yarn splicing device 26, a suction pipe (first capture device) 27, and a suction mouth (second capture device) 28.

The suction pipe 27 is rotatably supported by a support shaft 27A, and captures the yarn Y (first yarn) from the air spinning device 7 and guides it to the yarn joining device 26. The suction pipe 27 is movable between a capture position where it captures the yarn Y and a guide position (standby position) where it guides the yarn Y to the yarn joining device 26.

The suction mouth 28 is rotatably supported by a support shaft 28A, and captures the yarn Y (second yarn) from the winding device 13 and guides it to the yarn joining device 26. The suction mouth 28 is movable between a capture position where it captures the yarn Y and a guide position (standby position) where it guides the yarn Y to the yarn joining device 26. Instead of or in addition to the suction mouth 28, each spinning unit 2 may be provided with a capture device (second capture device) that is fixedly disposed downstream of the yarn storage device 11. When a yarn breakage or the like occurs, the capture device captures the yarn Y on the package P side and guides the yarn Y to the yarn joining device 26.

The yarn joining device 26 joins the guided yarns Y together. The yarn joining device 26 is a splicer that uses compressed air, or a knotter that mechanically joins the yarns Y, etc.

Next, we will explain the operation of the spinning machine 1 when performing yarn discharge spinning with the air spinning device 7.

During yarn discharge spinning in the air spinning device 7, the unit controller 10 controls the rotational drive of the back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17 so that the IDR and BDR have the same ratio as during normal spinning, and the MDR has a different ratio than during normal spinning. In other words, during yarn discharge spinning, the unit controller 10 controls the rotational drive of the back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17 so that the count of the yarn Y is changed only by the MDR. The count is changed to a thicker count or a thinner count. During yarn discharge spinning, the period from the start to the end of the yarn discharge spinning operation is during yarn discharge spinning.

Specifically, the unit controller 10 changes (sets) the MDR during yarn discharge spinning, for example, so that the yarn Y has a fine count (e.g., from "Ne20" to "Ne30"). In this case, for example, if the MDR during normal spinning is "30," the unit controller 10 controls the rotational drive of the front roller pair 17 so that the MDR during yarn discharge spinning becomes "45." The count of the yarn Y during yarn discharge spinning is preset in the machine control device 5A.

The unit controller 10 controls the rotational drive of the back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17 so that the peripheral speeds of the back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17 during yarn discharge spinning are lower than the peripheral speeds during normal spinning. More specifically, the unit controller 10 controls the rotational drive of the first motor 32, the second motor 33, the third motor 34, and the fourth motor 35. For example, when the speed of the fiber bundle S sent out from the draft device 6 during normal spinning is 600 m/min, the unit controller 10 controls the rotational drive of the back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17 so that the speed of the fiber bundle S sent out from the draft device 6 during yarn discharge spinning is 300 m/min.

After the yarn discharge spinning, the unit controller 10 changes the MDR so that the yarn Y has a count that is the same as that during normal spinning. After the yarn discharge spinning, the unit controller 10 accelerates the circumferential speeds of the back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17 to the circumferential speeds during normal spinning. That is, the unit controller 10 controls the rotational drive of the back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17 so that the speed of the fiber bundle S sent out from the draft device 6 is 600 m/min. The unit controller 10 accelerates the back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17 in synchronization with each other. That is, the unit controller 10 accelerates the back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17 in synchronization with each other so that the IDR and BDR do not change.

In the draft device 6, the width (first width) of the fiber bundle S between the middle roller pair 16 and the third roller pair 15 is the same during yarn discharge spinning and normal spinning. In other words, in the draft device 6, the width of the fiber bundle S between the middle roller pair 16 and the third roller pair 15 does not change during yarn discharge spinning and normal spinning. The width of the fiber bundle S is the dimension in the direction of the rotation axis of the third roller pair 15 and the middle roller pair 16, and corresponds to the number of fibers in the fiber bundle S. The width of the fiber bundle S can also be confirmed visually by the operator.

In the draft device 6, the width (second width) of the fiber bundle S between the third roller pair 15 and the back roller pair 14 is the same during yarn discharge spinning and normal spinning. In other words, in the draft device 6, the width of the fiber bundle S between the third roller pair 15 and the back roller pair 14 does not change during yarn discharge spinning and normal spinning. In this embodiment, "equivalent" may mean not only equal, but also equal to values that include slight differences within a preset range.

The yarn Y generated by the air spinning device 7 through yarn discharge spinning is guided to the yarn joining device 26 by the suction pipe 27. When the front roller pair 17 has completed accelerating from the circumferential speed during yarn discharge spinning to the circumferential speed during normal spinning, the yarn joining device 26 performs yarn joining. More specifically, after the suction pipe 27 is positioned (reaches) at the guide position and the different number removal operation time (predetermined time) has elapsed, the yarn joining device 26 starts yarn joining. The different number removal operation time is the time required for the suction pipe 27 to remove (suck) the yarn Y generated during yarn discharge spinning to have a different number from that during normal spinning. The different number removal operation time is set based on the speed of the fiber bundle S sent out from the draft device 6. For example, when the speed of the fiber bundle S sent out from the draft device 6 is 600 m/min, the different number removal operation time is less than 1 second. In other words, when the speed of the fiber bundle S sent out from the draft device 6 is 600 m/min, the yarn splicing device 26 starts splicing less than one second after the suction pipe 27 is positioned at the guide position.

As described above, in the spinning machine 1 according to this embodiment, during yarn discharge spinning, the IDR and BDR are controlled to have the same ratio as during normal spinning, and the MDR is controlled to have a ratio different from that during normal spinning. That is, the count of the fiber bundle S is changed between the front roller pair 17 and the middle roller pair 16. The count of the fiber bundle S is maintained between the middle roller pair 16 and the back roller pair 14 during yarn discharge spinning and normal spinning. As a result, in the spinning machine 1, it is only necessary to remove the yarn Y generated from the fiber bundle S that was present between the front roller pair 17 and the middle roller pair 16 before starting normal spinning. Therefore, in the spinning machine 1, the amount of waste yarn generated during yarn discharge spinning can be reduced.

In addition, the spinning machine 1 can reduce the amount of waste yarn, which shortens the time it takes for the suction pipe 27 to remove the yarn Y. Therefore, after the suction pipe 27 captures the yarn Y, the yarn joining device 26 can immediately start joining the yarn. Therefore, the spinning machine 1 can shorten the cycle time.

In spinning machine 1, the IDR is set to 1.2 to 3.0 times, and the MDR is set to 15 to 60 times. In this way, since the MDR has a ratio of about 15 times the IDR, the IDR can be prevented from approaching 1.0 times even if the MDR is changed during yarn discharge spinning. If the IDR approaches 1.0 times, there is a risk of the fiber becoming wavy. In spinning machine 1, this phenomenon can be prevented from occurring.

In the spinning machine 1 according to this embodiment, the unit controller 10 controls the rotational drive of the front roller pair 17, the middle roller pair 16, the third roller pair 15, and the back roller pair 14 so that the peripheral speeds of the front roller pair 17, the middle roller pair 16, the third roller pair 15, and the back roller pair 14 during yarn discharge spinning are lower than the peripheral speeds during normal spinning. With this configuration, the amount of fiber bundle S consumed can be reduced.

In the spinning machine 1 according to this embodiment, the unit controller 10 synchronously accelerates the middle roller pair 16, the third roller pair 15, and the back roller pair 14 to the circumferential speed during normal spinning after yarn discharge spinning. In this configuration, the middle roller pair 16, the third roller pair 15, and the back roller pair 14 are synchronously accelerated, so that the IDR and BDR do not change when shifting from yarn discharge spinning to normal spinning. That is, the spinning machine 1 can maintain the IDR and BDR constant throughout the entire period of yarn discharge spinning, acceleration, and normal spinning. Therefore, the fiber bundle S between the middle roller pair 16 and the back roller pair 14 during yarn discharge spinning and acceleration can be used to generate yarn Y without discarding the fiber bundle S. Therefore, the amount of waste yarn can be reduced.

In the spinning machine 1 according to this embodiment, if the width of the fiber bundle S between the middle roller pair 16 and the third roller pair 15 is defined as the first width, and the width of the fiber bundle S between the third roller pair 15 and the back roller pair 14 is defined as the second width, the first width and the second width are equivalent during yarn discharge spinning and normal spinning. In the spinning machine 1, the IDR and BDR during yarn discharge spinning are the same ratio as during normal spinning, so the first width and the second width of the fiber bundle S are equivalent during yarn discharge spinning and normal spinning. In this way, in the spinning machine 1, since the first width of the fiber bundle S does not change, even if the width of the regulating section 37 is narrowed, it is possible to avoid the fibers from clogging the regulating section 37. When the width of the regulating section 37 is narrow, the uniformity of the yarn Y is improved.

In the spinning machine 1 according to this embodiment, the unit controller 10 accelerates the front roller pair 17, the middle roller pair 16, the third roller pair 15, and the back roller pair 14 to the circumferential speed during normal spinning after the yarn discharge spinning. When the front roller pair 17 has been accelerated to the circumferential speed during normal spinning, the yarn joining device 26 performs yarn joining. In the spinning machine 1, the yarn count is changed between the front roller pair 17 and the middle roller pair 16 during yarn discharge spinning and during spinning operation, but the yarn count of the fiber bundle S is maintained between the middle roller pair 16 and the back roller pair 14. Therefore, when the front roller pair 17 has been accelerated to the circumferential speed during normal spinning, the yarn joining device 26 can perform yarn joining. This allows the cycle time to be shortened.

In the spinning machine 1 according to this embodiment, when the suction pipe 27 is positioned at the guide position, the yarn joining device 26 starts joining after the different yarn count removal operation time has elapsed. The different yarn count removal operation time is less than 1 second, for example, when the speed of the fiber bundle S sent out from the draft device 6 is 600 m/min. In other words, when the speed of the fiber bundle S sent out from the draft device 6 is 600 m/min, the yarn joining device 26 starts joining less than 1 second after the suction pipe 27 is positioned at the guide position (after the yarn Y is guided to the yarn joining device 26). This allows the cycle time to be shortened.

Although the embodiments of the present invention have been described above, the present invention is not necessarily limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention.

In the above embodiment, one draft roller is rotated by one motor. However, multiple draft rollers may be rotated by one motor. For example, the back roller pair 14 and the third roller pair 15 may be rotated by one motor.

In the above embodiment, an example has been described in which the unit controller 10 controls the rotational drive of the back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17 so that the circumferential speeds of the back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17 are lower during yarn discharge spinning than during normal spinning. However, it is not necessary to reduce the circumferential speed during yarn discharge spinning. In other words, only the MDR needs to be changed during yarn discharge spinning.

In the above embodiment, an example has been described in which the unit controller 10 controls the operation of the draft device 6. However, the operation of the draft device 6 may also be controlled by the machine control device 5A.

In the above embodiment, in the spinning unit 2, the yarn storage device 11 has the function of pulling out the yarn Y from the air spinning device 7, but the yarn Y may be pulled out from the air spinning device 7 by a delivery roller and a nip roller. When the yarn Y is pulled out from the air spinning device 7 by a delivery roller and a nip roller, a slack tube and/or a mechanical compensator that absorbs slack in the yarn Y by suction air flow may be provided instead of or in addition to the yarn storage device 11.

In the spinning machine 1 of the above embodiment, the devices are arranged in the machine height direction so that the yarn Y supplied from above is wound on the below. However, the devices may be arranged so that the yarn Y supplied from below is wound on the above.

In the above embodiment, an example has been described in which the devices related to the yarn splicing operation (yarn splicing device 26, suction pipe 27, suction mouth 28) are provided on the yarn splicing cart 3. However, at least one of the devices related to the yarn splicing operation may be provided on each spinning unit 2 instead of on the yarn splicing cart 3.

In the above embodiment, the tension sensor 9 may be disposed upstream of the yarn monitoring device 8 in the running direction of the yarn Y. A unit controller 10 may be provided for each spinning unit 2. In the spinning unit 2, the waxing device 12, the tension sensor 9, and the yarn monitoring device 8 may be omitted.

In the above embodiment, the spinning machine 1 is illustrated (see FIG. 1) as winding a cheese-shaped package P, but it is also possible to wind a cone-shaped package P. In the case of a cone-shaped package P, slack in the yarn Y occurs due to the traverse of the yarn Y, but this slack can be absorbed by the yarn storage device 11.

The materials and shapes of each component are not limited to those described above, and various materials and shapes can be used. The above numerical values may include at least one of the design, manufacturing, and measurement errors.

1... spinning machine, 6... draft device, 7... air spinning device, 10... unit controller (control device), 13... winding device, 14... back roller pair (fourth roller pair), 15... third roller pair (third roller pair), 16... middle roller pair (second roller pair), 17... front roller pair (first roller pair), 26... yarn joining device, 27... suction pipe (first capture device), 28... suction mouth (second capture device), S... fiber bundle, Y... yarn (first yarn, second yarn).

Claims (9)

A draft device for drafting the fiber bundle;
an air spinning device that generates yarn by twisting the drafted fiber bundle with a swirling air flow;
A control device for controlling the operation of the draft device,
The draft device is
A first roller pair arranged on the most downstream side in the running direction of the fiber bundle;
a second roller pair disposed upstream of the first roller pair in the traveling direction;
a third roller pair disposed upstream of the second roller pair in the traveling direction;
a fourth roller pair disposed upstream of the third roller pair in the running direction,
In the draft device, a draft ratio of the first roller pair to the second roller pair is a first ratio, a draft ratio of the second roller pair to the third roller pair is a second ratio, and a draft ratio of the third roller pair to the fourth roller pair is a third ratio;
The control device controls the rotational drive of each of the first roller pair, the second roller pair, the third roller pair, and the fourth roller pair so that, during yarn output spinning to start normal spinning in the air spinning device, the second ratio and the third ratio become the same ratios as during normal spinning. The spinning machine according to claim 1, wherein the control device controls the rotational drive of each of the first roller pair and the second roller pair so that the first ratio is different during the yarn discharge spinning and during the normal spinning. The spinning machine according to claim 1 or 2, wherein the control device controls the rotational drive of the first roller pair so that the peripheral speed of the first roller pair during the yarn discharge spinning is lower than that during the normal spinning. The spinning machine according to claim 3, wherein the control device controls the rotational drive of the second roller pair, the third roller pair, and the fourth roller pair so that the peripheral speeds of the second roller pair, the third roller pair, and the fourth roller pair are lower during the yarn discharge spinning than during the normal spinning. The spinning machine according to claim 4, wherein the control device synchronously accelerates the second roller pair, the third roller pair, and the fourth roller pair to the peripheral speed during normal spinning after the yarn discharge spinning. The spinning machine according to any one of claims 1 to 5, wherein, when the width of the fiber bundle between the second roller pair and the third roller pair is a first width, and the width of the fiber bundle between the third roller pair and the fourth roller pair is a second width, the first width and the second width during the yarn discharge spinning are equal to the first width and the second width during the normal spinning. a winding device for winding the yarn to form a package;
a yarn splicing device that splices a first yarn from the air spinning device and a second yarn from the package of the winding device;
a first capturing device that guides the first yarn to the yarn joining device;
a second capturing device that guides the second yarn to the yarn joining device,
The control device includes:
After the yarn discharge spinning, each of the first roller pair, the second roller pair, the third roller pair, and the fourth roller pair is accelerated to a peripheral speed during normal spinning,
The spinning machine according to claim 4 , wherein when acceleration to the peripheral speed during normal spinning is completed in the first roller pair, the yarn splicing device is caused to perform yarn splicing. The spinning machine according to claim 7, wherein the control device causes the yarn joining device to start yarn joining after the yarn is guided to the yarn joining device by the first capturing device and the second capturing device and a predetermined time has elapsed that is set based on the peripheral speed of the first roller pair during normal spinning. A spinning method for a spinning machine including a draft device that drafts a fiber bundle, and an air spinning device that twists the drafted fiber bundle with a swirling air flow to generate a yarn, comprising:
The draft device is
A first roller pair arranged on the most downstream side in the running direction of the fiber bundle;
a second roller pair disposed upstream of the first roller pair in the traveling direction;
a third roller pair disposed upstream of the second roller pair in the traveling direction;
a fourth roller pair disposed upstream of the third roller pair in the running direction,
In the draft device, a draft ratio of the first roller pair to the second roller pair is a first ratio, a draft ratio of the second roller pair to the third roller pair is a second ratio, and a draft ratio of the third roller pair to the fourth roller pair is a third ratio;
A spinning method, comprising controlling the rotational drive of each of the first roller pair, the second roller pair, the third roller pair, and the fourth roller pair during yarn discharge spinning to start normal spinning in the air spinning device so that the second ratio and the third ratio are the same ratios as those during normal spinning.

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