JP2019119940A - Spinning machine and spinning method - Google Patents

Abstract

To provide a spinning machine and a spinning method, which can adjust the size of a fiber bundle portion formed at an end of yarn.SOLUTION: A spinning machine 1 comprises: a draft device 6; an air spinning device 7; and a control part 10, which makes the draft device 6 perform a second draft action to draft the fiber bundle F at the different draft ratio changed from the draft ratio for the first draft action to draft the fiber bundle F and stops air injection from the air spinning device 7 after the second draft action when dividing the fiber bundle F. The control part 10 obtains the timing to stop air injection from the air spinning device 7 based on the spinning condition, and stops the air injection from the air spinning device 7 based on the timing simultaneously with or after flowing of at least a part of the fiber bundle F that is drafted by the second draft action into the air spinning device 7.SELECTED DRAWING: Figure 1

Description

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

  As a conventional spinning machine, a drafting device for drafting a fiber bundle, and an air spinning device for producing a yarn by twisting the fiber bundle drafted by the drafting device by injecting air into the spinning chamber Are known (see, for example, Patent Document 1). In such a spinning machine, for example, when a yarn defect is detected, when the drafting operation by the drafting device is stopped, a fiber bundle portion (a tip) is not formed at the yarn end of the yarn. Be done.

JP, 2006-144136, A

  In the spinning machine as described above, if the length of the fiber bundle portion is too long, the fiber bundle portion may remain on the yarn storage roller, for example, when the yarn is stored in the yarn storage device using the yarn storage roller. is there. If the length of the fiber bundle portion is too short, there is a possibility that the yarn end of the yarn can not be reliably captured from the winding device when performing the yarn joining operation.

  An object of the present invention is to provide a spinning machine and a spinning method capable of adjusting the size of a fiber bundle formed at the yarn end of a yarn.

  A spinning machine according to one aspect of the present invention includes a plurality of rotatable roller pairs, and a drafting device drafting a fiber bundle by the roller pair and twisting the fiber bundle drafted by the drafting device by injecting air. In the drafting device, the air spinning device for producing the warp yarn and the fiber bundle are divided into a draft ratio of a ratio different from the draft ratio of the first drafting operation for drafting the fiber bundle to draft the fiber bundle 2) A control unit for stopping the injection of air in the pneumatic spinning device after the second drafting operation is performed while performing the second drafting operation, and a calculation for determining a timing for stopping the injection of air in the pneumatic spinning device based on the spinning conditions. And the control unit, when dividing the fiber bundle, the pneumatic spinning device based on the timing determined by the calculation unit. To stop the injection of that air.

  In the spinning machine according to one aspect of the present invention, the injection of air in the pneumatic spinning device is stopped after the second drafting operation is performed in the drafting device. The fiber bundle drafted by the second drafting operation is different from the fiber bundle drafted by the first drafting operation. When the second drafting operation is performed with a ratio larger than the draft ratio of the first drafting operation, the fiber bundle drafted by the second drafting operation is stretched more than the fiber bundle drafted by the first drafting operation. Therefore, in the fiber bundle after the second drafting operation, the fiber amount (the fiber amount in the cross-sectional area perpendicular to the drafting direction) is smaller than that of the fiber bundle after the first drafting operation. When the second drafting operation is performed with a ratio smaller than the draft ratio of the first drafting operation, the fiber bundle drafted by the second drafting operation is shorter than the fiber bundle drafted by the first drafting operation. Therefore, the fiber bundle after the second drafting operation has a larger amount of fibers than the fiber bundle after the first drafting operation. Thus, in the present spinning machine, the fiber amount of the fiber bundle can be adjusted by changing the draft ratio of the first draft operation and the draft ratio of the second draft operation. Therefore, in the spinning machine, the size (thickness and / or length) of the fiber bundle portion (a portion where twist is not properly given) formed on the yarn end of the yarn by the division of the fiber bundle (hereinafter also referred to as a dividing operation). Can be adjusted appropriately. In addition, division of a fiber bundle can be said to be division of yarn.

  Here, the time until the fiber bundle drafted by the second drafting operation flows into the pneumatic spinning device differs depending on the spinning conditions and the like. For example, if the jet of air in the air spinning device is stopped before the fiber bundle drafted by the second drafting operation flows into the air spinning device, a fiber bundle portion is formed in the fiber bundle whose count has not been changed. become. In this case, the size of the fiber bundle may not be properly adjusted.

  In the spinning machine according to one aspect of the present invention, the calculation unit calculates the timing for stopping the injection of air in the pneumatic spinning device based on the spinning conditions. At the same time or after at least a part of the fiber bundle drafted by the second drafting operation flows into the pneumatic spinning device based on the timing determined by the calculation unit, the control unit jets air in the pneumatic spinning device. Stop. Thus, in the spinning machine, the fiber bundle portion is reliably formed in the fiber bundle drafted by the second drafting operation. Therefore, in the present spinning machine, the dimensions of the fiber bundle can be appropriately adjusted.

  In one embodiment, the drafting device has at least three roller pairs disposed along the drafting path of the fiber bundle, and the control unit is disposed at the most downstream side of the drafting path among the at least three roller pairs. The second drafting operation is performed by changing the rotational speeds of one or more roller pairs other than the selected roller pair, and at the time when the second drafting operation is performed, the rotational speed of the roller pair is changed. A fiber bundle located between a leading roller pair, which is a roller pair disposed on the most downstream side of one of the draft paths, and a trailing roller pair, which is a roller pair disposed one downstream side of the leading roller pair At the same time or after at least a portion of the fiber bundle not held by the trailing roller pair flows into the pneumatic spinning device, the injection of air in the pneumatic spinning device is stopped. It may be. In this configuration, the injection of air can be stopped at an appropriate timing. Thus, in the spinning machine, twisting can be avoided from being applied to all the fiber bundles drafted by the second drafting operation, and the fiber bundle portion is formed in the fiber bundles drafted by the second drafting operation. Therefore, in the present spinning machine, the dimensions of the fiber bundle can be appropriately adjusted.

  In one embodiment, when at least a portion of the fiber bundle drafted by the second drafting operation is discharged from the outlet of the spinning unit of the air spinning device, the control unit is configured to, based on the timing determined by the calculating unit. , And may stop the injection of air in the pneumatic spinning device. In this configuration, the injection of air can be stopped at an appropriate timing.

  In one embodiment, the spinning machine includes a yarn detection device installed downstream of the yarn traveling path with respect to the pneumatic spinning device and detecting a yarn defect of the yarn, and the control unit determines the timing determined by the calculation unit Based on the above, when at least a part of the fiber bundle drafted by the second drafting operation passes through the yarn detection device, the jet of air in the pneumatic spinning device may be stopped. In this configuration, the injection of air can be stopped at an appropriate timing.

  In one embodiment, the spinning machine is installed on the downstream side of the traveling path of the yarn than the pneumatic spinning device, and includes a drawing device for drawing the yarn generated in the pneumatic spinning device, and the control unit is determined by the calculation unit Based on the timing, when at least a part of the fiber bundle drafted by the second drafting operation reaches the drawing device, the injection of air in the pneumatic spinning device may be stopped. In this configuration, the injection of air can be stopped at an appropriate timing.

  In one embodiment, the spinning machine is disposed between the pneumatic spinning device and the withdrawal device in the yarn traveling path, for extracting the yarn produced in the pneumatic spinning device, and detecting the yarn defect of the yarn. The draft device includes at least a first roller pair, a second roller pair, a third roller pair, and a fourth roller pair in this order from the downstream side to the upstream side in the draft path of the fiber bundle. And the control unit changes the ratio of the draft ratio of the third roller pair and the fourth roller pair from the first draft operation in the second draft operation, and the calculation unit includes the first roller pair and the second roller pair And a distance between the second roller pair and the third roller pair, and a value obtained by dividing the pulling speed at which the drawing device pulls the yarn by the rotation speed of the second roller pair. , No. A value obtained by dividing the rotational speed of the roller pair by the rotational speed of the third roller pair, a value obtained by dividing the withdrawal speed by the rotational speed of the first roller pair, a fiber bundle between the pneumatic spinning device and the first roller pair, Distance in the traveling path of the yarn, or distance in the traveling path of the fiber bundle and yarn between the yarn detection device and the first roller pair, or traveling of the fiber bundle and yarn between the drawing device and the first roller pair The time is calculated as the timing based on the distance in the path and the drawing speed, and the control unit controls the injection of air in the air spinning device when the time has passed since the yarn detection device detected a yarn defect of the yarn. You may make it stop. In this configuration, it is possible to appropriately calculate the time until the fiber bundle drafted by the second drafting operation is discharged from the pneumatic spinning device. Thus, in the spinning machine, no fiber bundle is formed by the fiber bundle drafted by the first drafting operation, and all the fiber bundle drafted by the second drafting operation is not twisted. A fiber bundle portion is formed in the fiber bundle drafted by the second drafting operation. Therefore, in the present spinning machine, the dimensions of the fiber bundle can be appropriately adjusted.

  In one embodiment, the pull-out device may be a yarn storage device that draws and stores yarn. In this configuration, the yarn can be stably pulled out of the pneumatic spinning device while removing the slack of the yarn Y.

  In one embodiment, the control unit may perform the second draft operation by setting the ratio larger than the draft ratio of the first draft operation in the draft device. In this configuration, the fiber bundle drafted by the second drafting operation is stretched more than the fiber bundle drafted by the first drafting operation. Therefore, the fiber bundle after the second drafting operation has a smaller amount of fibers than the fiber bundle after the first drafting operation. For example, in the case of producing small (thick) yarns, the amount of fiber bundles per unit time supplied to the air spinning device is large. In this case, the fiber bundle is not properly divided, and the fiber bundle portion formed at the yarn end of the yarn may be thick and long. In the present spinning machine, when the fiber bundle is divided, the fiber amount of the fiber bundle is reduced by the second drafting operation, so that it is possible to suppress the fiber bundle part from becoming thick and long. Therefore, in the present spinning machine, the dimensions of the fiber bundle portion formed at the yarn end of the yarn can be appropriately adjusted.

  In one embodiment, the control unit may cause the drafting device to perform the second drafting operation when the yarn count generated by the air spinning device is less than or equal to Ne15. When the yarn count produces a yarn of 15 or less Ne, the fiber amount of the fiber bundle is relatively large, and if the fiber bundle is divided as it is, the fiber bundle portion tends to be thick and long. Therefore, in the present spinning machine, by performing the second drafting operation when the yarn count produces a yarn of 15 or less of Ne, it is possible to suppress the fiber bundle from becoming thick and long, and appropriately adjust the size of the fiber bundle. be able to.

  In one embodiment, the control unit may perform the second draft operation at a ratio smaller than the draft ratio of the first draft operation in the draft device. In this configuration, the fiber bundle after the second drafting operation has a larger amount of fibers than the fiber bundle after the first drafting operation. Therefore, it is possible to avoid a situation where when the fiber bundle is divided, the fiber bundle part becomes too thin and it becomes difficult for the yarn catching device to catch the yarn end in the next yarn joining operation.

  In one embodiment, in the second drafting operation, the control unit may draft the fiber bundle at a draft ratio such that the yarn count generated by the air spinning device is in the range of Ne15 to Ne45. Thus, by drafting the fiber bundle in which the yarn count is in the range of Ne 15 to Ne 45, it is possible to make the fiber amount of the fiber bundle at the time of division an appropriate amount. Therefore, in the present spinning machine, it is possible to prevent the fiber bundle part from being too thick, too thin, too long, or too short. And avoid the situation where the fiber bundle part is thick and long and fibers are easily scattered around, or the situation where the fiber bundle part is too thin and it is difficult to catch the yarn end by the yarn catching device can do.

  In one embodiment, the spinning machine comprises a plurality of spinning units, each comprising at least three roller pairs and an air spinning device, wherein at least one roller pair of at least three roller pairs is provided. Is provided independently for each spinning unit so as to enable rotational drive, and the control unit performs the second drafting operation by changing the rotational speed of the roller pair capable of independent rotational drive. Good. With this configuration, it is possible to change the draft ratio in the second draft operation by using a roller pair that is rotationally driven independently for each spinning unit. Therefore, the second drafting operation can be performed at a desired timing for each spinning unit.

  A spinning method according to one aspect of the present invention includes a plurality of rotatable roller pairs, and a drafting device drafting a fiber bundle by the roller pairs and twisting the fiber bundle drafted by the drafting device by jetting air. In the drafting device, the air spinning device for producing the warp yarn and the fiber bundle are divided into a draft ratio of a ratio different from the draft ratio of the first drafting operation for drafting the fiber bundle to draft the fiber bundle (2) A spinning method implemented in a spinning machine comprising: a control unit that causes the air spinning device to stop the injection of air after the second drafting operation is performed while performing the second drafting operation, the air in the air spinning device The timing for stopping the injection of the ink is determined based on the spinning conditions, and when dividing the fiber bundle, the second drafting operation is performed based on the timing. After at least some of the more drafted fiber bundles simultaneously or flows flowing into the pneumatic spinning device, to stop the injection of air in the pneumatic spinning device.

  In the spinning method according to one aspect of the present invention, the injection of air in the pneumatic spinning device is stopped after the second drafting operation is performed in the drafting device. The fiber bundle drafted by the second drafting operation is different from the fiber bundle drafted by the first drafting operation. When the second drafting operation is performed with a ratio larger than the draft ratio of the first drafting operation, the fiber bundle drafted by the second drafting operation is stretched more than the fiber bundle drafted by the first drafting operation. Therefore, in the fiber bundle after the second drafting operation, the fiber amount (the fiber amount in the cross-sectional area perpendicular to the drafting direction) is smaller than that of the fiber bundle after the first drafting operation. When the second drafting operation is performed with a ratio smaller than the draft ratio of the first drafting operation, the fiber bundle drafted by the second drafting operation is shorter than the fiber bundle drafted by the first drafting operation. Therefore, the fiber bundle after the second drafting operation has a larger amount of fibers than the fiber bundle after the first drafting operation. Thus, in the spinning method, the fiber amount of the fiber bundle can be adjusted by changing the draft ratio of the first draft operation and the draft ratio of the second draft operation. Therefore, in the spinning method, the dimensions (thickness and / or length) of the fiber bundle portion (the portion where twist is not properly given) formed at the yarn end of the yarn by the dividing operation can be appropriately adjusted. .

  In the spinning method according to one aspect of the present invention, the timing for stopping the injection of air in the pneumatic spinning device is determined based on the spinning conditions, and based on the timing, at least a part of the fiber bundle drafted by the second drafting operation At the same time or after the air flows into the air spinning device, the injection of air in the air spinning device is stopped. Thus, in the spinning method, the fiber bundle portion is reliably formed in the fiber bundle drafted by the second drafting operation. Therefore, in the spinning method, the size of the fiber bundle can be appropriately adjusted.

  According to one aspect of the present invention, the dimensions of the fiber bundle portion formed at the yarn end of the yarn can be adjusted.

FIG. 1 is a front view of a spinning machine according to one embodiment. FIG. 2 is a side view of a spinning unit of the spinning machine of FIG. FIG. 3 is a longitudinal sectional view of the pneumatic spinning device of the spinning unit of FIG. FIG. 4 is a longitudinal sectional view of the pneumatic spinning device moving from the spinning position to the retracted position. FIG. 5 is a longitudinal sectional view of the pneumatic spinning device in the retracted position. FIG. 6 is a diagram showing the fiber amount of yarn and the timing of stopping air injection in the air spinning device.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements will be denoted by the same reference symbols, without redundant description.

  As shown in FIG. 1, the spinning machine 1 includes a plurality of spinning units 2, a yarn joining carriage 3, a doffing carriage (not shown), a first end frame 4, and a second end frame 5. Have. The plurality of spinning units 2 are arranged in a line. Each spinning unit 2 generates a yarn Y and winds it on a package P. The yarn joining carriage 3 performs a yarn joining operation in the spinning unit 2 when the yarn Y is cut in a certain spinning unit 2 or when the yarn Y is broken for some reason. When the package P is fully wound in a certain spinning unit 2, the doffing truck doffs the package P and supplies a new bobbin B to the spinning unit 2.

  The first end frame 4 accommodates a recovery device and the like for recovering fiber waste and yarn waste generated by the spinning unit 2. The second end frame 5 adjusts the air pressure of the compressed air (air) supplied to the spinning machine 1 to supply air to each part of the spinning machine 1, and supplies power to each part of the spinning unit 2 A drive motor or the like for storing the The second end frame 5 is provided with a machine control device 100, a display screen 102, and an input key 104. The machine control device 100 centrally manages and controls each part of the spinning machine 1. The display screen 102 can display information on setting contents and / or status of the spinning unit 2 and the like. When the operator performs an appropriate operation using the input key 104, the setting operation of the spinning unit 2 can be performed.

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

  The draft device 6 drafts the fiber bundle (sliver) F. The draft device 6 includes a back roller pair (fourth roller pair) 14, a third roller pair (third roller pair) 15, and a middle roller pair (second roller pair) sequentially from the upstream side in the traveling direction of the fiber bundle F. 16 and a front roller pair (first roller pair) 17. In other words, in the drafting 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 drafting path of the fiber bundle F There is.

  The back roller pair 14 has a top roller 14a and a bottom roller 14b. The third roller pair 15 includes 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. The bottom rollers 14 b, 15 b, 16 b and 17 b are rotationally driven by a drive motor provided in the second end frame 5 or a drive motor provided in each spinning unit 2. In the present embodiment, the bottom rollers 14 b and 15 b are rotationally driven by a drive motor provided in each spinning unit 2. The bottom rollers 16 b and 17 b are rotationally driven by a drive motor provided on the second end frame 5. An apron belt 18 a is provided for the top roller 16 a of the middle roller pair 16. An apron belt 18 b is provided for the bottom roller 16 b of the middle roller pair 16.

  The air spinning device 7 twists the fiber bundle F drafted by the drafting device 6 by the swirling air flow to produce a yarn Y. As shown in FIG. 3, at the spinning position, the air spinning device 7 jets air to the fiber bundle F drafted by the drafting device 6 and twists it to produce a yarn Y. At the spinning position, the pneumatic spinning device 7 is disposed close to the draft device 6 (specifically, the front roller pair 17) at the time of spinning, and the fiber bundle F is supplied from the draft device 6 to the pneumatic spinning device 7 It is the position of the air spinning device 7. The air spinning device 7 has a nozzle block 70 and a hollow guide shaft body 80. The hollow guide shaft body 80 is inserted into the nozzle block 70 from the downstream side. At this time, an internal space formed by the nozzle block 70 and the hollow guide shaft body 80 is a spinning chamber 73.

  The nozzle block 70 has a fiber guide portion 71 and a swirl flow generation portion 72. The fiber guide portion 71 is provided with a guide hole 71 a for guiding the fiber bundle F supplied from the draft device 6 to the spinning chamber 73. The fiber guide portion 71 is provided with a needle 75. The tip 75 a of the needle 75 is located in the spinning chamber 73. The needle 75 has a function of suppressing the propagation of the twist on the upstream side of the spinning chamber 73. The swirling flow generating unit 72 is provided with a plurality of nozzles 74 communicating with the spinning chamber 73. The plurality of nozzles 74 are arranged such that a swirling flow is generated in the spinning chamber 73 when air is jetted. The swirling flow generating unit 72 is provided with a hole 72 a into which the hollow guide shaft body 80 is inserted. The hole 72 a is formed in a truncated cone shape which is tapered toward the upstream side, and communicates with the spinning chamber 73.

  The hollow guide shaft body 80 is insertable into the hole 72 a of the swirling flow generation unit 72. The upper end portion 80 a of the hollow guide shaft body 80 is formed in a truncated cone shape which is tapered toward the upstream side. The hollow guide shaft body 80 is provided with a passage 81 extending along the central axis of the hollow guide shaft body 80. The upstream side of the passage 81 is in communication with the spinning chamber 73, and the passage 81 is formed to expand toward the outlet 83 on the downstream side. The recovery unit 77 communicates with the spinning chamber 73 through a gap formed between the upper end 80 a of the hollow guide shaft 80 and the hole 72 a of the swirl flow generation unit 72. In the present embodiment, the spinning chamber 73 and the passage 81 are collectively referred to as a spinning unit. In the spinning unit, the fiber bundle F changes to yarn Y.

  The pneumatic spinning device 7 is supported so as to be movable (rotatable) by a support shaft (not shown). As shown in FIGS. 4 and 5, the air spinning device 7 is movable to a retracted position farther from the draft device 6 than the spinning position. The hollow guide shaft body 80 is further movable from the nozzle block 70 at the retracted position. When the pneumatic spinning device 7 moves from the spinning position to the retracted position, as shown in FIG. 4, the nozzle block 70 and the hollow guide shaft body 80 integrally separate from the drafting device 6. Thereafter, as shown in FIG. 5, only the nozzle block 70 stops at a predetermined position. The hollow guide shaft 80 continues to move and separates from the nozzle block 70. Thereafter, the hollow guide shaft body 80 separated from the nozzle block 70 stops at a predetermined position.

  As shown in FIGS. 1 and 2, the yarn monitoring device 8 monitors the information of the traveling yarn Y between the pneumatic spinning device 7 and the yarn storage device 11, and a yarn defect based on the monitored information. To detect the presence or absence of The yarn monitoring device 8 transmits a yarn defect detection signal to the unit controller 10 when a yarn defect is detected. The yarn monitoring device 8 detects, for example, thickness abnormality of the yarn Y and / or foreign matter contained in the yarn Y as yarn defects. The yarn monitoring device 8 also detects yarn breakage and the like. The tension sensor 9 measures the tension of the traveling yarn Y between the pneumatic spinning device 7 and the yarn storage device 11, and transmits a tension measurement signal to the unit controller 10. When the unit controller 10 determines that there is an abnormality based on the detection result of the yarn monitoring device 8 and / or the tension sensor 9, the yarn Y is cut (broken) in the spinning unit 2.

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

  The yarn storage device 11 takes slack of the yarn Y between the pneumatic spinning device 7 and the winding device 13. The yarn storage device 11 has a function of stably pulling out the yarn Y from the pneumatic spinning device 7 and causes the yarn Y to be stagnated and slackened as the yarn Y delivered from the pneumatic spinning device 7 during yarn joining operation by the yarn joining carriage 3 or the like. It has a function to prevent, and a function to prevent the fluctuation of the tension of the yarn Y on the downstream side of the yarn storage device 11 from being transmitted to the pneumatic spinning device 7.

  The winding device 13 winds the yarn Y around the 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.

  When the yarn Y is cut in a certain spinning unit 2 or the yarn Y is broken for some reason, the yarn joining carriage 3 travels to the spinning unit 2 to perform a yarn joining operation. The yarn joining carriage 3 has a yarn joining device 26, a suction pipe (yarn catching device) 27, and a suction mouse (yarn catching device) 28. The suction pipe 27 is rotatably supported by the support shaft 31 and captures the yarn Y from the pneumatic spinning device 7 and guides the yarn Y to the yarn joining device 26. When the suction pipe 27 captures the yarn end of the yarn Y, it cuts the fiber bundle portion Y1 formed at the yarn end and guides the yarn end of the yarn Y obtained by cutting the fiber bundle portion Y1 to the yarn joining device 26. The suction mouse 28 is rotatably supported by the support shaft 32, captures the yarn Y from the winding device 13 and guides the yarn Y to the yarn joining device 26. When the suction mouse 28 captures the yarn end of the yarn Y, it cuts off the fiber bundle portion Y1 formed at the yarn end and guides the yarn end of the yarn Y obtained by cutting the fiber bundle portion Y1 to the yarn joining device 26. The yarn joining device 26 performs yarn joining between the guided yarns Y. The yarn joining device 26 is a splicer using compressed air, a knotter mechanically joining yarn Y, or the like. When the yarn joining carriage 3 performs the yarn joining operation, the package P is rotated in the reverse winding direction (reverse rotation).

  Next, an operation (spinning method) relating to adjustment of the length of the fiber bundle portion Y1 formed at the yarn end of the yarn Y will be described. In addition, the fiber bundle part Y1 is the area | region where twist is not given in the yarn end of the yarn Y which continues in a package P, as FIG. 5 shows. The operation of forming the fiber bundle portion Y1 is performed, for example, when a yarn defect is detected and spinning is stopped, or when the package P is fully wound and spinning is finished.

  When dividing the fiber bundle F, the unit controller 10 is different from the draft ratio of the first drafting operation of drafting the fiber bundle F so as to be the count of the yarn Y generated by the pneumatic spinning device 7 in the drafting device 6 The second drafting operation for drafting the fiber bundle F is performed by changing to the draft ratio of the ratio, and the injection of air in the pneumatic spinning device 7 is stopped after the second drafting operation is performed.

  The unit controller 10 determines the timing for stopping the injection of air in the pneumatic spinning device 7 based on the spinning conditions. Spinning conditions may include spinning speed, draft ratio, draft gauge, and the like. When dividing the fiber bundle F, the unit controller 10 simultaneously or after flowing into the pneumatic spinning device 7 at least a part of the fiber bundle F drafted by the second drafting operation based on the above timing. The injection of air in the air spinning device 7 is stopped.

  In the present embodiment, the unit controller 10 implements the second draft operation by changing the rotational speed of the back roller pair 14, that is, changing the rotational speeds of the roller pairs other than the front roller pair 17. Unit controller 10 is disposed at the most downstream side of the draft path of the roller pair (one or more of roller pairs 14, 15 and 16) whose rotational speed has been changed when the second drafting operation is performed. Located between the leading roller pair which is a fixed roller pair and the trailing roller pair which is a roller pair (one of the roller pairs 14, 16 and 17) disposed one downstream side of the leading roller pair After at least a part of the fiber bundle F which is the fiber bundle F and is not held by the trailing roller pair flows into the pneumatic spinning device 7, the jet of air in the pneumatic spinning device 7 is stopped. For example, in the case where the roller pair whose rotational speed has been changed is the back roller pair 14, the fiber is located between the back roller pair 14 and the third roller pair 15 and is not held by the third roller pair 15. After at least a part of the bundle F flows into the pneumatic spinning device 7, the injection of air in the pneumatic spinning device 7 is stopped.

The unit controller 10 calculates the time T from the reception of the yarn defect detection signal transmitted from the yarn monitoring device 8 to the stop of the air injection in the pneumatic spinning device 7. In the present embodiment, as the second drafting operation, the case where the rotational speed of the back roller pair 14 (bottom roller 14 b) is changed will be described. In this case, the unit controller 10 calculates the time T [msec] based on the following equation (1).
T = {(D1 × M × I / F) + (D2 × M / F) + D3} / (S / 60) + K (1)
D1 [mm] is the distance in the draft path between the third roller pair 15 and the middle roller pair 16 (the distance between the centers of the third roller pair 15 and the middle roller pair 16). D1 is also referred to as a draft gauge for the third roller pair 15 and the middle roller pair 16.

  M is the main draft ratio. M is a value (spinning speed / middle roller rotational speed) obtained by dividing the spinning speed [m / min] by the rotational speed [m / min] of the middle roller pair 16. In the present embodiment, the spinning speed corresponds to the drawing speed at which the yarn storage device 11 draws the yarn Y.

  I is an intermediate draft ratio. I is a value (middle roller rotation speed / third roller rotation speed) obtained by dividing the rotation speed [m / min] of the middle roller pair 16 by the rotation speed [m / min] of the third roller pair 15.

  F is a feed ratio. F is a value (spinning speed / front roller rotational speed) obtained by dividing the spinning speed [m / min] by the rotational speed [m / min] of the front roller pair 17.

  D2 [mm] is the distance in the draft path between the middle roller pair 16 and the front roller pair 17 (the distance between the centers of the middle roller pair 16 and the front roller pair 17). D2 is also referred to as a draft gauge for the middle roller pair 16 and the front roller pair 17.

  D3 [mm] is the distance between the outlet 83 of the hollow guide shaft 80 and the front roller pair 17 in the traveling path of the fiber bundle F and the yarn Y.

  S [m / min] is a spinning speed.

  K is a constant set based on the environment of the spinning machine 1. K is a constant that takes into consideration, for example, the communication environment (signal delay) between the yarn monitoring device 8 and the unit controller 10, and the air flow delay in the air spinning device 7. K is, for example, “−10”. “60” is a numerical value for converting the unit of time T into [msec].

  After the yarn defect is detected in the yarn monitoring device 8 (after the yarn defect signal is received in the unit controller 10), the fiber bundle F between the back roller pair 14 and the third roller pair 15 (second This corresponds to a time (first time) until a part (head) of the fiber bundle F drafted by the second drafting operation is discharged from the outlet 83 of the air spinning device 7.

  The unit controller 10 calculates the time T based on information (spinning conditions etc.) preset in the storage unit (not shown). Specifically, when the spinning conditions (production lot) are input by the input key 104 of the machine control device 100, the unit controller 10 calculates the time T based on the spinning conditions.

  In the present embodiment, a method of adjusting the length of the fiber bundle portion Y1 in the case of spinning the yarn Y whose count is less than Ne 15 will be described with reference to FIG. In FIG. 6, the alternate long and short dash line indicates the fiber amount of the yarn Y, and the solid line indicates the timing of control of the draft device 6 and the pneumatic spinning device 7 by the unit controller 10. The vertical axis in FIG. 6 shows the increase and decrease of the fiber amount of the yarn Y. The horizontal axis of FIG. 6 indicates the passage of time.

  When a yarn defect is detected by the yarn monitoring device 8 during spinning, a yarn defect detection signal is sent to the unit controller 10. In FIG. 6, it is shown that a yarn defect (abnormal thickness of the yarn Y) occurs in a portion indicated by a dashed dotted line surrounded by a dashed line. When receiving the yarn defect detection signal, the unit controller 10 controls the operation of the drafting device 6. Specifically, when the unit controller 10 receives the yarn defect detection signal at time T1, the unit controller 10 drafts a first drafting operation to draft the fiber bundle F to be the count of the yarn Y to be generated by the pneumatic spinning device 7. A second drafting operation is performed to draft the fiber bundle F by making the ratio larger than the ratio. That is, when receiving the yarn defect detection signal, the unit controller 10 changes the total draft ratio of the draft device 6.

  Specifically, the unit controller 10 changes the total draft ratio of the draft device 6 so as to be finer than the count of the currently spun yarn Y. Specifically, the unit controller 10 changes the draft ratio (break draft ratio) between the back roller pair 14 and the third roller pair 15. For example, when the yarn is spinning the yarn Y of Ne 10, the unit controller 10 changes the draft ratio to when the yarn is spinning the yarn Y of Ne 35. Specifically, the unit controller 10 changes the rotational speed of the back roller pair 14 and changes the break draft ratio, thereby setting the total draft ratio to, for example, 3.5 times the speed when the count is Ne10. As a result, the total draft ratio in the drafting device 6 is changed, and the fiber bundle F for spinning the yarn Y of Ne 35 is drafted.

  The unit controller 10 sets the draft ratio for performing the second draft operation in the draft device 6 based on the information set in advance in the storage unit. In the storage unit, the yarn count and the draft ratio of the second draft operation at the count are stored in association with each other. The draft ratio of the second draft operation is set such that the count of the yarn Y generated by the pneumatic spinning device 7 is in the range of Ne15 or more and Ne45 or less. That is, in the second drafting operation, the unit controller 10 drafts the fiber bundle F at a draft ratio in which the count of the yarn Y generated by the pneumatic spinning device 7 is in the range of Ne15 to Ne45. It is more preferable that the yarn count of yarn Y be set so as to fall within a range of Ne30 or more and Ne40 or less. The unit controller 10 performs, for example, a second drafting operation corresponding to the count of the yarn Y input as one of the spinning conditions (the count of the yarn Y to be produced) when the spinning conditions are input using the input key 104. The draft ratio of is obtained from the storage unit. The draft ratio in the second draft operation may be set, for example, by the operator using the input key 104.

  Subsequently, when the unit controller 10 causes the draft device 6 to draft the fiber bundle F (perform the second draft operation) for a predetermined time after changing the total draft ratio, the rotation of the back roller pair 14 is stopped. , And controls the draft device 6 (performs the dividing operation). The predetermined time is the above-mentioned time T from the reception of the yarn defect detection signal transmitted from the yarn monitoring device 8 to the discharge of the fine fiber bundle F from the pneumatic spinning device 7. That is, the unit controller 10 drafts the rotation of the back roller pair 14 to stop when the fine-counted fiber bundle F flows into the pneumatic spinning device 7 and is discharged from the pneumatic spinning device 7. Control the device 6; Since the front roller pair 17 is connected to a drive source different from the back roller pair 14, the driving of the front roller pair 17 is continued. As a result, the fiber bundle F is divided between the back roller pair 14 and the front roller pair 17.

  The unit controller 10 also controls the pneumatic spinning device 7 so as to stop the injection of air by the plurality of nozzles 74. Specifically, the unit controller 10 stops the injection of air by the plurality of nozzles 74 based on the time T calculated based on the above equation (1). That is, the unit controller 10 stops the injection of air by the plurality of nozzles 74 so that twisting is not given to all the fiber bundles F for which the second drafting operation has been performed. Specifically, as shown in FIG. 6, when the unit controller 10 receives a yarn defect detection signal at time T1, the unit controller 10 jets air by the plurality of nozzles 74 at time T2 after time T has elapsed. Stop it. As a result, as shown in FIG. 6, air is not jetted to all the fiber bundles F whose fiber amount has been reduced by the second drafting operation, so that all the fiber bundles F by the second drafting operation are twisted. It can be avoided.

  Then, the unit controller 10 controls the pneumatic spinning device 7 so as to start the movement of the pneumatic spinning device 7 from the spinning position to the retracted position. By the above operation, the yarn Y is divided and the fiber bundle portion Y1 is formed at the yarn end of the yarn Y.

  In the above, the case where the yarn monitoring device 8 detects a yarn defect and interrupts spinning is described, but the same operation is performed when the package P is determined to be fully wound and the spinning is ended. However, in this case, it is preferable to shorten the length of the fiber bundle portion Y1 so that the knot does not break when the package P is applied to the warper in the next step.

  As described above, the spinning machine 1 according to the present embodiment stops the injection of air in the pneumatic spinning device 7 after the second drafting operation is performed in the drafting device 6. The fiber bundle F drafted by the second drafting operation is stretched more than the fiber bundle F drafted by the first drafting operation. Therefore, the fiber bundle F after the second drafting operation has a smaller amount of fibers than the fiber bundle F after the first drafting operation. For example, in the case of producing a small (thick) yarn Y having a yarn count, the fiber amount of the fiber bundle F supplied to the pneumatic spinning device 7 is large. In this case, when the fiber bundle F is divided, the fiber bundle F is not appropriately divided, and the fiber bundle portion (portion where twist is not properly given) Y1 formed at the yarn end of the yarn Y is elongated. There is. In the spinning machine 1, when the fiber bundle F is divided, the fiber amount of the fiber bundle F is reduced by the second drafting operation, so that the fiber bundle portion Y1 is elongated when the fiber bundle F is divided. Can be suppressed. Therefore, in the spinning machine 1, the length of the fiber bundle portion Y1 formed at the yarn end of the yarn Y can be appropriately adjusted.

  Further, since it is possible to suppress the fiber bundle portion Y1 from becoming long, it is possible to suppress the fibers from scattering around the front roller pair 17 and the like and adhering to the front roller pair 17 and the like.

  Here, the time until the fiber bundle F drafted by the second drafting operation flows into the pneumatic spinning device 7 differs depending on the spinning conditions and the like. For example, when the fiber bundle F drafted by the second drafting operation stops the injection of air in the pneumatic spinning device 7 before flowing into the pneumatic spinning device 7, the fiber bundle portion Y1 in the fiber bundle F whose count is not changed Will be formed. In this case, adjustment of the dimensions of the fiber bundle Y1 may not be properly performed.

  In the spinning machine 1 according to the present embodiment, the unit controller 10 obtains the timing for stopping the injection of air in the pneumatic spinning device 7 based on the spinning conditions. The unit controller 10 stops the injection of air in the pneumatic spinning device 7 after at least a part of the fiber bundle F drafted by the second drafting operation flows into the pneumatic spinning device 7 based on the determined timing. As a result, in the spinning machine 1, the fiber bundle portion Y1 is reliably formed in the fiber bundle F drafted by the second drafting operation. Therefore, in the spinning machine 1, the dimensions of the fiber bundle portion Y1 can be appropriately adjusted.

  In the spinning machine 1 according to the present embodiment, the yarn storage device 11 for drawing out the yarn generated in the pneumatic spinning device 7 and the yarn Y are disposed between the air spinning device 7 and the yarn storage device 11 in the traveling path of the yarn Y And a yarn monitoring device 8 for detecting a yarn defect of Y. The draft device 6 includes a front roller pair 17, a middle roller pair 16, a third roller pair 15, and a back roller pair 14 in this order from the downstream side to the upstream side in the draft path of the fiber bundle F.

  In the spinning machine 1 according to the present embodiment, the unit controller 10 calculates the time from the reception of the yarn defect detection signal transmitted from the yarn monitoring device 8 to the stop of the air injection in the pneumatic spinning device 7. In the present embodiment, the unit controller 10 calculates the time T from the above equation (1). In this configuration, the time until the fiber bundle F drafted by the second drafting operation is discharged from the pneumatic spinning device 7 can be appropriately calculated. Therefore, in the spinning machine 1, the fiber bundle portion Y1 is not formed by the fiber bundle F drafted by the first drafting operation, and twisting is given to all of the fiber bundle F drafted by the second drafting operation Instead, the fiber bundle portion Y1 is formed in the fiber bundle F drafted by the second drafting operation. Therefore, in the spinning machine 1, the dimensions of the fiber bundle portion Y1 can be appropriately adjusted.

  In the spinning machine 1 according to the present embodiment, the unit controller 10 drafts the fiber bundle F at a draft ratio in which the count of the yarn Y generated by the pneumatic spinning device 7 is in the range of Ne15 to Ne45 in the second drafting operation. Let As described above, by drafting the fiber bundle F in which the count of the yarn Y is in the range of Ne 15 to Ne 45, it is possible to make the fiber amount of the fiber bundle F at the time of division an appropriate amount. Therefore, in the spinning machine 1, it is possible to prevent the fiber bundle portion Y1 from being too thick, too thin, too long, or too short. Then, the situation where the fiber bundle portion Y1 is thick and long and fibers are easily scattered around is avoided, or since the fiber bundle portion Y1 is too thin, it is difficult to capture the yarn end by the suction pipe 27 and the suction mouse 28 The situation can be avoided.

  In the spinning machine 1 according to the present embodiment, the unit controller 10 causes the drafting device 6 to carry out the second drafting operation when the count of the yarn Y generated by the pneumatic spinning device 7 is less than Ne15. When the yarn count produces yarn Y less than Ne 15, the fiber amount of the fiber bundle F is relatively large. Therefore, in the spinning machine 1, by performing the second drafting operation when the yarn count is less than Ne 15, the fiber bundle portion Y1 can be prevented from becoming longer, and the fiber bundle portion Y1 has an appropriate length. Can be adjusted.

  As mentioned above, although embodiment of this invention was described, this invention is not necessarily limited to embodiment mentioned above, A various change is possible in the range which does not deviate from the summary.

  In the above-described embodiment, an example in which the total draft ratio of the draft device 6 is changed in the spinning machine 1 so as to be finer than that of the currently spun yarn Y has been described. However, in the spinning machine, the total draft ratio of the draft device 6 may be changed so as to be thicker than the count of the currently spun yarn Y. Specifically, the unit controller 10 performs the dividing operation after the drafting device 6 performs the second drafting operation with the ratio smaller than the drafting ratio of the first drafting operation.

  Thus, in the drafting device 6, the unit controller 10 sets the drafting ratio of the ratio different from the drafting ratio of the first drafting operation to draft the fiber bundle F serving as the count of the yarn Y generated by the pneumatic spinning device 7. After carrying out the second drafting operation of drafting the fiber bundle F in a modified manner, there is provided a yarn end control mode (tip control mode) of stopping the injection of air in the air spinning device 7. The fiber bundle F drafted by the second drafting operation is different from the fiber bundle F drafted by the first drafting operation. When the second drafting operation is performed with a ratio larger than the draft ratio of the first drafting operation, the fiber bundle F drafted by the second drafting operation is stretched more than the fiber bundle F drafted by the first drafting operation Be Therefore, the fiber bundle F after the second drafting operation has a smaller amount of fibers than the fiber bundle F after the first drafting operation. When the second drafting operation is performed with a ratio smaller than the draft ratio of the first drafting operation, the fiber bundle F drafted by the second drafting operation is shorter than the fiber bundle F drafted by the first drafting operation Become. Therefore, the fiber bundle F after the second drafting operation has a larger amount of fibers than the fiber bundle F after the first drafting operation. Thus, in the spinning machine, the fiber amount of the fiber bundle F can be adjusted by changing the draft ratio of the first draft operation and the draft ratio of the second draft operation. Therefore, in the spinning machine, the dimensions of the fiber bundle portion Y1 formed at the yarn end of the yarn Y can be appropriately adjusted. As a result, in the spinning machine, even if the yarn Y is generated at a count value which is not desirable for the division of the fiber bundle F, it can be divided at an appropriate count in the division operation.

  The count of the yarn Y that can be generated by the draft ratio of the second drafting operation, that is, the count of yarn Y preferable for dividing can be set based on the quality and the operability. The quality here is the amount of scattering of cotton in the fiber bundle portion Y1. The operability in this case is the success rate at the yarn joining carriage 3. The above-mentioned quality tends to decrease as the yarn count becomes smaller (the yarn Y becomes thicker) and to improve as the yarn count becomes larger (the yarn Y becomes thinner). That is, the amount of scattering of cotton increases as the count decreases, and decreases as the count increases. The above operability tends to increase as the count decreases, and to decrease as the count increases. That is, the success rate for out-placing increases as the count decreases, and decreases as the count increases. From the viewpoint of the balance between the quality and the operability, for example, it is preferable to set the count to 15 to 45. However, the count is not limited to 15-45.

  The above-mentioned count may be freely set by the user depending on which of quality and operability is to be emphasized. The predetermined count range (for example, "○ No. to ○ No.") range when the user performs the above-described thread end control by operating the operation unit (the input key 104 or the touch panel described later) For example, it may be possible to previously set a target division number (for example, ○ number / more specifically, for example, 30 number) to be achieved by the second draft operation, for example. Then, when spinning is performed in a predetermined count range, for example, when a yarn defect is detected, the unit controller 10 performs the second draft operation at the draft ratio that becomes the target division number, and then performs the division operation. It is also good.

  In the above embodiment, the bottom rollers 14b and 15b are rotationally driven by the drive motor provided to each spinning unit 2, and the bottom rollers 16b and 17b are rotationally driven by the drive motor provided to the second end frame 5. An example has been described. In this configuration, the second draft operation has been described as an example by changing the draft ratio of the back roller pair 14 and the third roller pair 15 of the draft device 6. However, the bottom rollers 14b, 15b, 16b and 17b may be rotationally driven by drive motors provided in the respective spinning units 2. In this configuration, the second draft operation may be performed by changing the draft ratio of any one of the back roller pair 14, the third roller pair 15, and the middle roller pair 16. In the present invention, it is preferable that the second drafting operation be performed by changing the rotational speed of the draft roller pair that is rotationally driven independently for each spinning unit 2.

Specifically, for example, the unit controller 10 changes the draft ratio of the third roller pair 15 and the middle roller pair 16. Specifically, the unit controller 10 changes the rotational speed of the third roller pair 15 and changes the intermediate draft ratio (draft ratio between the third roller pair 15 and the middle roller pair 16) to obtain a total draft ratio. Change In such a configuration, the unit controller 10 calculates the time T [msec] based on the following equation (2).
T = {(D2 × M / F) + D3} / (S / 60) + K (2)

Also, for example, the unit controller 10 changes the draft ratio of the middle roller pair 16 and the front roller pair 17. Specifically, the unit controller 10 changes the rotational speed of the middle roller pair 16 and changes the total draft ratio by changing the draft ratio (draft ratio between the middle roller pair 16 and the front roller pair 17). Do. In such a configuration, the unit controller 10 calculates the time T [msec] based on the following equation (3).
T = D3 / (S / 60) + K (3)

  As described above, the unit controller 10 can appropriately calculate the time when the fiber bundle F drafted by the second drafting operation is discharged from the pneumatic spinning device 7. Therefore, in the spinning machine 1, since it is possible to avoid twisting all the fiber bundles F drafted by the second drafting operation, the fiber bundle portion Y1 is formed in the fiber bundles F drafted by the second drafting operation Be done. Therefore, in the spinning machine 1, the dimensions of the fiber bundle can be appropriately adjusted.

  Further, in the above formulas (1), (2) and (3), D3 indicates that “the fiber bundle F and the yarn between the outlet 83 of the hollow guide shaft 80 (the outlet of the spinning unit) and the front roller pair 17 Instead of the distance along the Y traveling path, the distance along the traveling path of the fiber bundle F and the yarn Y between the entrance of the spinning chamber 73 (the entrance of the spinning unit) and the front roller pair 17 may be used. In this case, the unit controller 10 can appropriately calculate the time until the fiber bundle F drafted by the second drafting operation flows into the pneumatic spinning device 7. Therefore, it is possible to stop the injection of air in the air spinning device 7 at the same time as at least a part (head portion) of the fiber bundle drafted by the second drafting operation flows into the air spinning device. Even in this case, in the spinning machine 1, it is possible to avoid twisting of all the fiber bundles F drafted by the second drafting operation, so the fiber bundle portion Y1 in the fiber bundles F drafted by the second drafting operation Is formed. Therefore, in the spinning machine 1, the dimensions of the fiber bundle can be appropriately adjusted. D3 may be “the distance between the air spinning device 7 (any position in the air spinning device 7) and the front roller pair 17 in the traveling path of the fiber bundle F and the yarn Y”. The arbitrary position in the air spinning device 7 is not limited to the inlet and the outlet of the spinning unit described above, but may be a midpoint of the spinning unit, for example, a change point at which the fiber bundle F changes to the yarn Y.

  In the above equations (1), (2) and (3), D3 is “the distance between the yarn monitoring device 8 and the front roller pair 17 in the traveling path of the fiber bundle F and the yarn Y” It is also good. In this case, the unit controller 10 can appropriately calculate the time (second time) until the fiber bundle F drafted by the second drafting operation passes the yarn monitoring device 8. Therefore, stopping the jet of air in the air spinning device 7 at the same time as or before at least a part (head portion) of the fiber bundle drafted by the second drafting operation passes through the yarn monitoring device 8 it can. Even in this case, in the spinning machine 1, it is possible to avoid twisting of all the fiber bundles F drafted by the second drafting operation, so the fiber bundle portion Y1 in the fiber bundles F drafted by the second drafting operation Is formed. Therefore, in the spinning machine 1, the dimensions of the fiber bundle can be appropriately adjusted.

  Further, in the above formulas (1), (2) and (3), D3 is “the distance between the yarn storage device 11 and the front roller pair 17 in the traveling path of the fiber bundle F and the yarn Y” It is also good. In this case, the unit controller 10 can appropriately calculate the time (third time) until the fiber bundle F drafted by the second drafting operation reaches the yarn storage device 11. Therefore, before at least a part (head portion) of the fiber bundle drafted by the second drafting operation reaches the yarn storage device 11, it is possible to stop the injection of air in the pneumatic spinning device 7. Even in this case, in the spinning machine 1, it is possible to avoid twisting of all the fiber bundles F drafted by the second drafting operation, so the fiber bundle portion Y1 in the fiber bundles F drafted by the second drafting operation Is formed. Therefore, in the spinning machine 1, the dimensions of the fiber bundle can be appropriately adjusted.

  In the above embodiment, the drafting device 6 has been described by way of example as having the back roller pair 14, the third roller pair 15, the middle roller pair 16, and the front roller pair 17. However, the drafting device may have at least three roller pairs. In this configuration, the unit controller 10 performs the second draft operation by changing the rotational speed of one or more roller pairs other than the roller pair disposed at the most downstream side of the draft path among the at least three roller pairs. To carry out.

  In the above embodiment, an example in which the operator performs an appropriate operation such as setting work using the input key 104 has been described. However, the display screen 102 is a touch panel display, and the operator uses the input key 104 instead of or together with the input key 104. The touch panel may be operable.

  In addition to the above embodiment, the spinning machine 1 may further include an injection device and a suction device. The injection device injects air into the region between the draft device 6 and the pneumatic spinning device 7 after the movement of the pneumatic spinning device 7 from the spinning position to the retracted position is started. The injectors are arranged to inject air across the fiber passage in the area (the path along which the fiber bundle F travels). The injector is preferably arranged to inject air along a direction perpendicular to the fiber passage. The injector is controlled by the unit controller 10 to inject air at a desired timing. The suction device is disposed so as to face the injection device across the area, and sucks the fibers remaining in the area and its periphery. For example, the ejection device is located on the top roller 17a side with respect to the area, and the suction device is located on the bottom roller 17b side with respect to the area. The positions of the injection device and the suction device may be interchanged.

  In the above embodiment, the count of yarn Y is indicated by Ne (English number count), but the number of yarn Y may be indicated in other ways.

  In the above embodiment, the mode in which the unit controller 10 functions as the control unit and the calculation unit has been described as an example. However, each of the control unit and the calculation unit may be configured by an independent device.

  The yarn joining device 26 may be a Pierce using a seed yarn.

  The air spinning device 7 may be configured to prevent the twist of the fiber bundle from being transmitted to the upstream side of the air spinning device by the downstream end portion of the fiber guiding portion instead of the needle 75. The air spinning device may be provided with a pair of air jet nozzles that twist the fiber bundle in opposite directions, instead of the above configuration. The spinning machine may be an open end spinning machine.

  In the spinning unit 2, the yarn storage device 11 has the function of drawing the yarn Y from the pneumatic spinning device 7, but the yarn Y may be drawn from the pneumatic spinning device 7 by the delivery roller and the nip roller. When the yarn Y is drawn from the pneumatic spinning device 7 by the delivery roller and the nip roller, a slack tube or a mechanical compensator may be provided instead of the yarn storage device 11 to absorb the slack of the yarn Y by the suction air flow.

  In the spinning machine 1, the respective devices are arranged such that the yarn Y supplied at the upper side is wound up at the lower side in the height direction. However, each device may be arranged such that the yarn supplied on the lower side is wound up on the upper side.

  In the spinning machine 1, at least one of the bottom rollers of the draft device 6 and the traverse guide 23 are driven by the power from the second end frame 5 (that is, common to the plurality of spinning units 2). However, each part (for example, a draft device, an air spinning device, a winding device, etc.) of the spinning unit 2 may be driven independently for each spinning unit 2.

  In the traveling direction of the yarn Y, the tension sensor 9 may be disposed on the upstream side of the yarn monitoring device 8. The 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 FIG. 1, the spinning machine 1 is illustrated as winding up a cheese-shaped package P, but it is also possible to wind a cone-shaped package. In the case of a cone-shaped package, yarn slack occurs due to the traverse of the yarn, but the slack can be absorbed by the yarn storage device 11. The material and shape of each configuration are not limited to the above-described materials and shapes, and various materials and shapes can be adopted.

  DESCRIPTION OF SYMBOLS 1 ... Spinning machine, 6 ... Draft apparatus, 7 ... Air spinning apparatus, 8 ... Yarn monitoring apparatus (yarn detection apparatus) 10 ... Unit controller (control part, calculation part) 14 ... Back roller pair (4th roller pair) , 15: third roller pair (third roller pair), 16: middle roller pair (second roller pair), 17: front roller pair (first roller pair), F: fiber bundle, Y: yarn.

Claims (13)

A drafting device having a plurality of rotatable roller pairs for drafting a fiber bundle by the roller pairs;
An air spinning device for twisting the fiber bundle drafted by the drafting device by injection of air to produce a yarn;
When dividing the fiber bundle, the drafting device performs a second drafting operation of drafting the fiber bundle by changing the draft ratio of the ratio different from the draft ratio of the first drafting operation of drafting the fiber bundle. And a control unit for stopping the injection of the air in the pneumatic spinning device after the second drafting operation is performed;
And a calculation unit for determining the timing of stopping the injection of the air in the pneumatic spinning device based on the spinning conditions.
When dividing the fiber bundle, the control unit causes at least a part of the fiber bundle drafted by the second drafting operation to flow into the pneumatic spinning device based on the timing obtained by the calculation unit. At the same time or after the inflow, the injection of the air in the pneumatic spinning device is stopped. The drafting device comprises at least three roller pairs arranged along the drafting path of the fiber bundle,
The control unit
The second drafting operation is performed by changing the rotational speed of one or more roller pairs other than the roller pair disposed on the most downstream side of the draft path among the at least three roller pairs. ,
At the time when the second drafting operation is performed, a leading roller pair which is the roller pair disposed on the most downstream side of the draft path of the roller pair whose rotational speed has been changed, and the leading roller pair The fiber bundle located between the downstream roller pair and the downstream roller pair disposed on the downstream side of at least a portion of the fiber bundle not held by the downstream roller pair is the air The spinning machine according to claim 1, wherein the injection of the air in the pneumatic spinning device is stopped simultaneously with or after entering the spinning device. The control unit
Based on the timing obtained by the calculation unit,
The jet of air is stopped in the pneumatic spinning device when at least a part of the fiber bundle drafted by the second drafting operation is discharged from the outlet of the spinning unit of the pneumatic spinning device. The spinning machine according to 2. A yarn detection device disposed downstream of the pneumatic spinning device on the traveling path of the yarn and detecting a yarn defect of the yarn;
The control unit
Based on the timing obtained by the calculation unit,
The spinning machine according to claim 1 or 2, wherein the jet of air in the pneumatic spinning device is stopped when at least a part of the fiber bundle drafted by the second drafting operation passes through the yarn detection device. . It is provided on the downstream side of the traveling path of the yarn with respect to the pneumatic spinning device, and includes a drawing device for drawing out the yarn generated in the pneumatic spinning device,
The control unit
Based on the timing obtained by the calculation unit,
The spinning machine according to claim 1 or 2, wherein the jet of air in the pneumatic spinning device is stopped when at least a part of the fiber bundle drafted by the second drafting operation reaches the drawing device. A drawing device for drawing out the yarn generated in the pneumatic spinning device;
And a yarn detection device disposed between the pneumatic spinning device and the drawing device in the traveling path of the yarn and detecting a yarn defect of the yarn;
The drafting device has at least a first roller pair, a second roller pair, a third roller pair, and a fourth roller pair in this order from the downstream side to the upstream side in the drafting path of the fiber bundle,
The control unit changes the ratio of the draft ratio of the third roller pair and the fourth roller pair from the first draft operation in the second draft operation,
The calculation unit
The distance in the draft path between the first pair of rollers and the second pair of rollers;
The distance in the draft path between the second pair of rollers and the third pair of rollers;
A value obtained by dividing the drawing speed at which the drawing device draws the yarn by the rotational speed of the second roller pair;
A value obtained by dividing the rotational speed of the second roller pair by the rotational speed of the third roller pair;
A value obtained by dividing the drawing speed by the rotational speed of the first roller pair;
The distance between the pneumatic spinning device and the first roller pair in the travel path of the fiber bundle and the yarn, or the travel of the fiber bundle and the yarn between the yarn detection device and the first roller pair A distance in a path, or a distance in a traveling path of the fiber bundle and the yarn between the drawing device and the first roller pair;
The withdrawal speed;
Calculate the time as the timing based on
The controller according to any one of claims 1 to 5, wherein the control unit stops the injection of the air in the pneumatic spinning device when the time has elapsed since the yarn detection device detects a yarn defect of the yarn. The spinning machine as described in a paragraph.   The spinning machine according to claim 5 or 6, wherein the drawing-out device is a yarn storage device that draws and stores the yarn.   The spinning machine according to any one of claims 1 to 7, wherein the control unit performs the second drafting operation by making the ratio larger than the drafting ratio of the first drafting operation in the drafting device.   The spinning machine according to claim 8, wherein the control unit causes the drafting device to perform the second drafting operation when the yarn count of the yarn generated by the air spinning device is equal to or less than Ne15.   The spinning machine according to any one of claims 1 to 7, wherein the control unit causes the drafting device to execute the second drafting operation at a ratio smaller than the drafting ratio of the first drafting operation.   The controller according to any one of claims 1 to 10, wherein, in the second drafting operation, the control unit drafts the fiber bundle at a draft ratio in which the yarn count of the yarn generated by the pneumatic spinning device is in the range of Ne15 to Ne45. The spinning machine according to any one of the preceding claims. Equipped with multiple spinning units,
Each of the spinning units includes at least three of the roller pairs and the pneumatic spinning device, and at least one of the at least one of the at least three roller pairs is independently driven to rotate by each of the spinning units. It is possible to
The spinning machine according to any one of claims 1 to 11, wherein the control unit performs the second drafting operation by changing the rotational speed of the roller pair capable of independently rotating and driving. A draft device having a plurality of rotatable roller pairs, the fiber bundle being drafted by the roller pair, and an air spinning device that twists the fiber bundle drafted by the draft device by injection of air to form a yarn And when dividing the fiber bundle, the drafting device changes the draft ratio of the first drafting operation for drafting the fiber bundle to a drafting ratio different from the drafting ratio of the first drafting operation and drafts the fiber bundle as the second drafting operation. And a control unit for stopping the injection of the air in the pneumatic spinning device after the second drafting operation is performed, and the spinning method implemented in the spinning machine,
The timing for stopping the injection of the air in the pneumatic spinning device is determined based on the spinning conditions,
When dividing the fiber bundle, at least a part of the fiber bundle drafted by the second drafting operation based on the timing simultaneously or after flowing into the air spinning device, the air spinning device A spinning method for stopping the injection of the air at

Images