JP2010001587A - Spinning machine and spinning method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spinning machine capable of raising coherency of a fiber bundle introduced into an air spinning apparatus, and improving yarn strength. <P>SOLUTION: The spinning machine is provided with the air spinning apparatus 9 having each introduction passage 21 for leading the fiber bundle 8 while deflecting thereof to one side according to the turning direction of a turning air stream, and a drafting apparatus for introducing the fiber bundle 8 subjected to the drafting treatment into the air spinning apparatus 9. The drafting apparatus has a front roller and a front bottom roller 28 for nipping the fiber bundle 8, and delivering the fiber bundle toward the introduction passage 21. Grooves 30 are formed on the surface of the front bottom roller 28, and the grooves 30 are tilted so that the ends of the grooves 30 on the same side as the side for deflecting the fiber bundle 8 in the introduction passage 21 are located in the upstream side when viewed from the front roller on the opposing side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a spinning machine, and more particularly, to a configuration for introducing a fiber bundle into an air spinning device.

  2. Description of the Related Art Conventionally, in a draft device used in a spinning machine, a configuration in which the surface of a draft roller is processed to improve the nip force of a fiber bundle is known. For example, Patent Document 1 discloses such a draft roller.

Patent Document 1 discloses a configuration in which a pneumatic roller is provided with a draft roller configured as follows. In other words, the draft roller has a mesh-like region having a parallelogram shape on the outer peripheral surface of the cylindrical body in a recess with respect to the outer peripheral surface of the cylindrical body. The overall shape of the mesh region is configured such that the first annular band group and the second annular band group intersect each other. The first annular belts have the same width, and are arranged in parallel at the same angle with respect to the axis of the cylindrical body at the same angle intervals along the axis. The second annular bands have the same width and are arranged in parallel at the same angle with respect to the axis and at the same length intervals along the axis. Patent Document 1 states that this configuration can prevent the durability of the draft roller from being lowered.
JP 2006-225787 A

  However, yarns produced by an air spinning device as shown in Patent Document 1 tend to have lower yarn strength than yarns produced by other types of spinning machines (for example, ring spinning machines). In some cases, thread breakage frequently occurred during the taking process. In this regard, although Patent Document 1 can prevent the durability of the draft roller from being lowered, there is room for improvement in terms of improving the yarn strength.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a spinning machine capable of improving the yarn strength by improving the convergence of the fiber bundle introduced into the pneumatic spinning device. .

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  According to a first aspect of the present invention, a spinning machine configured as follows is provided. That is, the spinning machine introduces an air spinning device having an introduction path that guides the fiber bundle to the downstream side while biasing the fiber bundle to one side according to the swirling direction of the swirling airflow, and the fiber bundle subjected to the drafting treatment is introduced into the air spinning device. A draft device. The draft device includes a draft roller pair that nips the fiber bundle and feeds the fiber bundle toward the introduction path. A groove is formed on the surface of at least one draft roller of the pair of draft rollers, and this groove is on the same side as the side where the fiber bundle is biased in the introduction path when viewed from the other draft roller. The groove is inclined so that the end of the groove is on the upstream side in the fiber bundle conveyance direction.

  Thereby, since the fiber bundle which passed the draft roller pair converges and is guided into the introduction path, the yarn strength can be improved. In addition, since the direction of the accompanying airflow generated by the rotation of the draft roller can be made to follow the feeding direction of the fiber bundle, minute floating fibers can be guided into the introduction path and merged with the fiber bundle, thereby reducing the fiber loss. It can be effectively reduced.

  Preferably, the spinning machine includes a plurality of spinning units each having the draft device and the pneumatic spinning device, and the draft device includes a drive source for each spinning unit.

  Thereby, while improving the convergence of a fiber bundle, a draft roller can be driven according to the situation for every spinning unit, so that high-quality yarn can be produced. Moreover, since the load in the thrust direction generated by driving the draft roller can be distributed to each spinning unit, the burden on the bearings and the like can be reduced.

  According to the second aspect of the present invention, the following spinning method is provided. That is, in this spinning method, a drafting process is performed by a drafting device having a draft roller pair on an air spinning device having an introduction path that guides the fiber bundle to the downstream side while biasing the fiber bundle to one side according to the swirling direction of the swirling airflow. Introduced fiber bundles. The spinning method includes the following first step and second step. In the first step, the fiber bundle is drafted by the draft device. In the second step, the fiber bundle is nipped by the draft roller pair and sent out toward the introduction path. A groove is formed on the surface of at least one of the draft roller pairs, and the groove is on the same side as the side where the fiber bundle is biased in the introduction path when viewed from the other draft roller. It is configured to be inclined so that the end of the groove is on the upstream side in the fiber bundle conveyance direction.

  By this method, the fiber bundle that has passed through the draft roller pair converges and is guided into the introduction path, so that the yarn strength can be improved. In addition, since the direction of the accompanying air flow generated by the rotation of the draft roller can be made to follow the feeding direction of the fiber bundle, minute floating fibers can be guided into the introduction path and merged with the fiber bundle, thereby reducing the fiber loss. It can be effectively reduced.

  Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a spinning machine 1 as a textile machine provided with a large number of spinning units 2 arranged side by side.

  As shown in FIG. 1, each spinning unit 2 includes a draft device 7, an air spinning device 9, a yarn feeding device 11, and a winding device 12 as main components. The draft device 7 is provided in the vicinity of the upper end of the casing 6 of the spinning machine 1, and the fiber bundle 8 sent from the draft device 7 is spun by the pneumatic spinning device 9. A spun yarn 10 spun by the pneumatic spinning device 9 is sent downward by a yarn feeding device 11 to detect a yarn defect, perform yarn cutting, and remove a yarn defect portion (yarn defect detector) 52. After that, it is wound up by the winding device 12 to form the package 51. As the clearer 52, for example, a function of detecting a defect in yarn thickness unevenness, a function of detecting foreign matter mixed in the spun yarn 10, and a combination of these functions can be considered.

  The spinning machine 1 is equipped with a blower box 80 and a prime mover box 81. Although not shown in the figure, the spinning machine 1 includes a yarn joining cart provided so as to be able to run in the direction in which the spinning units 2 are arranged, and a doffing cart provided so as to be able to run independently of the yarn joining cart. Prepare.

  Next, the driving of the spinning unit 2 will be described with reference to FIG. FIG. 2 is a side view schematically showing the relationship between the spinning unit and the drive source. The draft device 7 includes a draft roller for drawing the sliver 13 into the fiber bundle 8. The draft roller is composed of a top roller and a bottom roller that are arranged to face each other.

  As shown in FIG. 2, the top roller is composed of four rollers: a back roller 14, a third roller 15, a middle roller 16 on which an apron belt 17 is mounted, and a front roller 18. These top rollers 14, 15, 16, 18 are attached to a cover-like draft device cradle 50 provided in the draft device 7. On the other hand, the bottom roller on the driving side is composed of four rollers: a back bottom roller 24, a third bottom roller 25, a middle bottom roller 26 on which an apron belt 27 is mounted, and a front bottom roller 28. Each of the bottom rollers 24, 25, 26, and 28 is attached to the main body side of the draft device 7, and is disposed so as to face the top rollers 14, 15, 16, and 18. The details of the front bottom roller 28 will be described later.

  The yarn feeding device 11 includes a driving roller 61 and a nip roller 62 disposed to face the driving roller, and sends the spun yarn 10 spun by the pneumatic spinning device 9 to the winding device 12 side. The winding device 12 includes a drive drum 63 for rotating the package 51 to follow, and winds the spun yarn 10 sent by the yarn feeding device 11 around the package 51. Further, a traverse device 64 is disposed between the yarn feeding device 11 and the winding device 12, and the spun yarn 10 wound around the winding device 12 is traversed by the traverse device 64. As shown in FIG. 1, the spinning machine 1 includes a rotatable cradle 31 for holding a package 51. By rotating the cradle 31 (not shown in FIG. 2) by a rotating means (not shown), the drive drum 63 and the package 51 can be brought into and out of contact with each other.

  Next, driving of the spinning unit 2 will be described. As shown in FIG. 2, the bottom roller 24 and the third bottom roller 25 are connected to a motor 41, and the middle bottom roller 26 is connected to a motor 42. The front bottom roller 28 is connected to the motor 43. The motor 43 that drives the front bottom roller 28 is also connected to the driving roller 61 of the yarn feeding device 11 and the driving drum 63 of the winding device 12, and acceleration / deceleration of the front bottom roller 28, the driving roller 61, and the driving drum 63. Are controlled in a synchronized state. The traverse device 64 is connected to the motor 44. These motors 41, 42, 43, 44 are connected to the control unit 70, and the control unit 70 performs control such as rotation speed and rotation stoppage. These motors 41, 42, 43, 44 are provided for each spinning unit 2, and single spindle driving for performing drive control for each spinning unit 2 is realized.

  With the above configuration, the sliver 13 sent to the draft device 7 is stretched by a draft roller that is rotationally driven at different speeds, and is sent to the pneumatic spinning device 9 as a fiber bundle 8.

  Next, the pneumatic spinning device 9 will be described with reference to FIG. FIG. 3 is a longitudinal sectional view of the pneumatic spinning device 9. The pneumatic spinning device 9 includes a spinning nozzle 19 that causes a swirling flow to act on the fiber bundle 8 while the fiber bundle 8 sent from the front roller 18 and the front bottom roller 28 is inserted, and a tip portion is inserted into the spinning nozzle 19. The hollow guide shaft body (spindle) 20 is mainly provided.

  The spinning nozzle 19 includes a needle holder 23 that holds the needle 22 therein, and a nozzle portion casing 53 to which the needle holder 23 is attached. The needle holder 23 has an introduction path 21 for guiding the fiber bundle 8, and the needle 22 is on the flow path of the fiber bundle 8 conveyed along the introduction path 21 and at the center portion of the needle holder 23. Is retained. The details of the needle holder 23 will be described later.

  A taper hole 54 is provided in the nozzle casing 53 at a position downstream of the needle holder 23. And the front-end | tip part of the hollow guide shaft body 20 which has a taper angle substantially equal to the said taper hole 54 is coaxially inserted in this taper hole 54, and the predetermined clearance gap is inserted. A spinning chamber 33 is formed between the distal end surface of the hollow guide shaft body 20 and the needle holder 23, and the needle 22 protrudes into the spinning chamber 33. The tip of the needle 22 faces the tip surface of the hollow guide shaft body 20. A swirl flow generating chamber 32 is formed between the tapered hole 54 and the tip of the hollow guide shaft body 20.

  The nozzle casing 53 is provided with a plurality of swirl flow generating nozzles 35 whose outlet ends are opened to the spinning chamber 33. These swirl flow generating nozzles 35 are made of holes formed in the nozzle casing 53 and are inclined in the tangential direction of the spinning chamber 33 and downstream of the yarn feed. The swirl flow generating nozzle 35 receives supply of compressed air from a compressed air source (not shown) and injects the compressed air (compressed air) into the spinning chamber 33, for example, creates a swirl flow counterclockwise with respect to the traveling direction of the fiber bundle 8. 33. The swirling flow spirally flows downstream along the swirling flow generating chamber 32 around the tip of the hollow guide shaft body 20 and is discharged from an exhaust chamber 55 formed in the nozzle casing 53.

  A thread passage 29 is formed along the axial center of the hollow guide shaft body 20 so that the thread can pass through the thread path 29.

  With this configuration, the fiber bundle 8 discharged from the draft roller of the draft device 7 is introduced into the spinning chamber 33 from the introduction path 21, and the tip of each fiber is guided to the hollow guide shaft body 20. The rear end of the fiber is reversed by the suction air generated by the swirl flow generation nozzle 35 and simultaneously receives the swirl flow action by the swirl flow generation nozzle 35. Thereby, the reversed fiber is swung in the swirl flow generation chamber 32 and twisted. Although this twist tends to propagate to the draft roller side, the propagation is blocked by the needle 22, so that the fiber bundle 8 fed from the front roller 18 is not twisted by the twist. Thus, the needle 22 forms a twist propagation preventing means. The fibers twisted as described above are successively produced into actual twisted yarns, most of which are wound fibers, pass through the yarn passage 29, and are discharged from an outlet hole (not shown). And it is wound up by the winding device 12 through the yarn feeder 11 shown in FIG.

  Next, the needle holder (fiber introduction member) 23 of this embodiment will be described with reference to FIG. FIG. 4 is a perspective view schematically showing the state of the needle holder.

  As shown in FIG. 4, the needle holder 23 is integrally formed of ceramic or the like so that the entire needle holder 23 has a substantially cylindrical shape. The needle holder 23 is disposed so that the axial direction substantially coincides with the conveying direction of the fiber bundle 8, and is held in a state where the tip end portion of the needle 22 protrudes from the downstream end portion of the needle holder 23.

  The needle holder 23 has an introduction path 21 for receiving the fiber bundle 8 from the upstream draft device 7 and guiding it to the downstream spinning chamber 33. The introduction path 21 is formed so as to penetrate the needle holder 23, and the fiber bundle 8 sent to the introduction path 21 moves downstream while being guided (regulated) by the inner wall of the needle holder 23. .

  The inlet portion 90 of the introduction path 21 faces the nip point of the fiber bundle 8 by the front roller 18 and the front bottom roller 28, and has a rectangular outline. The inlet portion 90 is located outside the central portion where the needle 22 is held, and is disposed on the upper end surface of the needle holder 23.

  On the other hand, the outlet portion 91 of the introduction path 21 faces the hollow guide shaft body 20 of the spinning chamber 33. As shown in FIG. 4, the outlet portion 91 of the present embodiment includes a vertically long portion 92 formed in a vertically long shape, and a horizontally long shape that is connected to the end of the vertically long portion 92 and protrudes in the horizontal direction toward the needle 22 side. The portion 93 is formed to have a substantially L-shaped outline.

  The passage connecting the inlet portion 90 and the outlet portion 91 is formed so as to send the fiber bundle 8 introduced from the inlet portion 90 to the downstream spinning chamber 33 while converging. The introduction path 21 includes a first passage 85 and a second passage 86.

  The first passage 85 is a passage through which the fiber bundle 8 is first introduced, and is formed in the vicinity of the inlet portion 90. The first passage 85 is formed in a fan shape that narrows toward the downstream side, and guides the guided fiber bundle 8 to the second passage 86 while being biased toward one side of the introduction passage 21. The second passage 86 finally guides the fiber bundle 8 conveyed through the first passage 85 to the outlet portion 91 while guiding the fiber bundle 8 so as to approach the holding portion of the needle 22.

  The fiber bundle 8 guided to the introduction path 21 passes through the first passage 85 and the second passage 86, thereby drawing a spiral with the protruding direction of the needle 22 as the axial direction, as shown by the arrows in FIG. Be guided to. The swirling direction of the fiber bundle 8 in the introduction path 21 corresponds to the swirling direction of the swirling airflow in the spinning chamber 33. In this state, the fiber bundle 8 is guided to the spinning chamber 33 on the downstream side and is air-spun by the swirling flow.

  Next, the introduction of the fiber bundle 8 into the needle holder 23 will be described with reference to FIG. FIG. 5 is a plan view schematically showing the positional relationship between the front bottom roller 28 and the needle holder 23.

  The front roller 18 (not shown in FIG. 5) is made of an appropriate rubber member, while the front bottom roller 28 is made of metal. As shown in FIG. 5, grooves 30 having an inclination with respect to the rotational axis of the front bottom roller 28 are formed on the surface portion of the front bottom roller 28 at a predetermined pitch. The fiber bundle 8 is drafted and guided to the introduction path 21 by the front roller 18 and the front bottom roller 28. Note that the distance from the nip point of the fiber bundle 8 by the front roller 18 and the front bottom roller 28 to the introduction path 21 is appropriately set according to the fiber length.

  As shown in FIG. 5, in the front bottom roller 28 of the present embodiment, the groove 30 is formed to be inclined with respect to the axial direction. Therefore, the fiber bundle 8 is slightly inclined from the rotational direction to one side in the axial direction. . As a result, the fiber bundle 8 does not go straight, but is guided to the needle holder 23 in a state where the direction is biased to one side.

  As shown in FIG. 5, the end of the groove 30 on the same side (right side in FIG. 5) as the side where the fiber bundle 8 is biased in the vicinity of the inlet portion 90 in the introduction path 21 in plan view is the conveyance direction of the fiber bundle 8. The inclination direction of the groove 30 is set so as to be on the upstream side. As a result, at the nip point where the fiber bundle 8 is nipped, a force pushing the fiber bundle 8 acts on the side where the fiber bundle 8 in the introduction path 21 is biased. As a result, since the fiber bundle 8 is introduced into the introduction path 21 in a pre-biased state, the convergence is improved, and the number of fibers that peel from the fiber bundle 8 can be reduced.

  Further, an accompanying air flow is generated around the front bottom roller 28 due to the rotation of the front bottom roller 28 itself. The accompanying airflow is generated in the same direction as the direction in which the fiber bundle 8 is sent out due to the inclination of the groove 30. Suspended fibers such as short fibers near the front roller 18 and the front bottom roller 28 are carried to one side in the introduction path 21 by the accompanying airflow. The floating fibers carried into the introduction path 21 by the accompanying airflow are carried to one side in the introduction path 21 and are taken into the fiber bundle 8 that is also sent out while being biased to one side. As a result, the fibers that have been scattered in the air in the past can be guided to the downstream spinning chamber 33 after being joined to the fiber bundle 8.

  The above effect is supported by the results of the following experiments conducted by the inventors of the present application. This experiment was performed by actually spinning the groove 30 of the front bottom roller 28 in various directions and measuring the yarn strength.

  When the draft device 7 of the present invention described above is used (in the front bottom roller 28, the groove 30 is formed so that the end of the groove 30 on the same side as the side where the fiber bundle 8 is biased in the introduction path 21 is inclined upstream). The result of the experiment in the case of forming No. 30 was 14.08 for RKM indicating the yarn strength of the spun yarn, and 9.43% for CV% (standard deviation divided by the average value) indicating the variation in yarn strength. It was. On the other hand, when the front bottom roller formed so that the groove formed on the surface was parallel to the axial direction, RKM was 13.08 and CV% was 11.51%.

  Further, when the inclined direction of the groove formed on the front bottom roller 28 is opposite to that of the present embodiment, RKM is 13.64 and CV% is 12.19%. From this result, by setting the direction in which the groove 30 is inclined so that the introduction path 21 sends out the fiber bundle 8 toward the side where the fiber bundle 8 is biased, the yarn strength is improved and the variation thereof is also reduced. Recognize.

  As described above, the spinning machine 1 according to the present embodiment includes the pneumatic spinning device 9 having the introduction path 21 that guides the fiber bundle 8 to the downstream side in accordance with the swirling direction of the swirling airflow, and draft processing. And a draft device 7 for introducing the fiber bundle 8 subjected to the above to the pneumatic spinning device 9. The draft device 7 includes a front roller 18 and a front bottom roller 28 that nip the fiber bundle 8 and feed it toward the introduction path 21. A groove 30 is formed on the surface of the front bottom roller 28, and this groove 30 is the end of the groove 30 on the same side as the side where the fiber bundle 8 is biased in the introduction path 21 when viewed from the front roller 18 side. Is inclined so as to be on the upstream side in the fiber bundle conveying direction.

  Thereby, since the fiber bundle 8 that has passed through the draft roller pair converges and is guided into the introduction path 21, it is possible to improve the yarn strength and suppress variations in the yarn strength. Further, since the direction of the accompanying air flow generated by the rotation of the front bottom roller 28 can be made to follow the feeding direction of the fiber bundle 8, it is possible to guide minute floating fibers into the introduction path 21 and join the fiber bundle 8. And fiber loss can be effectively reduced.

  The spinning machine 1 of the present embodiment includes a plurality of spinning units 2 each having a draft device 7 and an air spinning device 9. The draft device 7 includes a driving source (motors 41, 42, 43) for each spinning unit 2.

  As a result, the convergence of the fiber bundle 8 can be improved, the draft roller can be driven in accordance with the situation of each spinning unit 2, and the high-quality spun yarn 10 can be produced. Further, since the load generated by the driving of the draft roller can be distributed for each spinning unit 2, the burden on the bearing member and the like can be reduced. In particular, when the groove 30 of the front bottom roller 28 is formed to be inclined with respect to the axial direction as in the present embodiment, the front bottom roller 28 receives the reaction force of the force that biases the fiber bundle 8. A thrust load acts on the roller 28. Therefore, if a common roller shaft is used in a plurality of spinning units 2 (front bottom rollers 28), the thrust load is superimposed and a large thrust force is generated, and a large load may be applied to the bearing supporting the drive shaft. In this respect, in the present embodiment, since the thrust load is not superimposed, the bearing can be effectively prevented from being damaged.

  In the present embodiment, spinning is performed by a spinning method including the following first step and second step. That is, in the first step, the fiber bundle 8 is drafted by the draft device 7. In the second step, the fiber bundle 8 is nipped by the draft roller pair of the front bottom roller 28 and the front roller 18 and sent out toward the introduction path 21. A groove 30 is formed on the surface of the front bottom roller 28. When viewed from the front roller 18, the groove 30 has an end portion of the groove 30 on the same side as the side where the fiber bundle 8 is biased in the introduction path 21. It is configured to be inclined so as to be on the upstream side in the fiber bundle conveyance direction.

  By this method, since the fiber bundle 8 that has passed through the draft roller pair converges and is guided into the introduction path 21, it is possible to improve the yarn strength and suppress variations in the yarn strength. Further, since the direction of the accompanying air flow generated by the rotation of the front bottom roller 28 can be made to follow the feeding direction of the fiber bundle 8, it is possible to guide minute floating fibers into the introduction path 21 and join the fiber bundle 8. And fiber loss can be effectively reduced.

  Although the preferred embodiment of the present invention has been described above, the above configuration can be further modified as follows.

  The needle holder 23 is not limited to the configuration shown in the above embodiment. That is, as long as it has an introduction path that guides the fiber bundle to the downstream side while biasing the fiber bundle to one side according to the swirling direction of the swirling airflow, a needle holder having an arbitrary configuration can be appropriately employed depending on circumstances. For example, the introduction path of the needle holder 23 can be changed to have a smoothly twisted shape according to the turning direction of the swirling airflow. Moreover, although the needle holder 23 of the said embodiment is integrally molded by the ceramic etc. as a whole, this invention is applicable not only to this structure but the structure which shape | molds a ceramic in a metal frame part.

  In the above-described embodiment, the single spindle driving system in which the motors 41, 42, and 43 for driving the draft rollers are provided for each spinning unit 2 is not limited to this configuration. For example, the spinning unit 2 can be divided into groups of 8 spindles, and a common drive source can be provided for each group. Alternatively, a full spindle driving system in which the draft roller is driven by a common driving source in the entire spinning machine 1 can be adopted.

  Further, it is also possible to divide the roller shaft of the draft roller for each spinning unit while driving the draft rollers of a plurality of spinning units with a single drive source. For example, it is conceivable that the roller shaft of the draft roller is provided for each spinning unit, and the roller shaft of each spinning unit is connected to a common drive shaft via a transmission means such as a gear or a belt. As a result, even if driven by a common drive source, the load in the thrust direction generated by the drive of the draft roller is distributed to each spinning unit, so it is effective to apply an excessive load and damage the bearing member and the like. Can be prevented.

1 is a front view of a spinning machine according to an embodiment of the present invention. The side view which showed typically the relationship between a spinning unit and a drive source. The longitudinal cross-sectional view of a pneumatic spinning apparatus. The perspective view which showed the mode of the needle holder roughly. The top view which showed typically the mode of the front bottom roller and the needle holder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spinning machine 2 Spinning unit 7 Draft device 8 Fiber bundle 9 Pneumatic spinning device 18 Front roller 21 Introduction path 23 Needle holder 28 Front bottom roller (draft roller)
30 groove 41, 42, 43 motor (drive source)

Claims (3)

An air spinning device having an introduction path that guides the fiber bundle toward the downstream side while biasing the fiber bundle to one side according to the swirling direction of the swirling airflow, and a draft device that introduces the fiber bundle that has been drafted into the air spinning device. In the spinning machine provided,
The draft device has a pair of draft rollers that nip the fiber bundle and feed it toward the introduction path,
A groove is formed on the surface of at least one draft roller of the pair of draft rollers, and this groove is on the same side as the side where the fiber bundle is biased in the introduction path when viewed from the other draft roller. A spinning machine characterized in that the end of the groove is inclined so as to be on the upstream side in the fiber bundle conveying direction. The spinning machine according to claim 1,
Each comprising a plurality of spinning units having the draft device and the pneumatic spinning device,
The spinning machine according to claim 1, wherein the draft device includes a drive source for each spinning unit. A spinning method for introducing a fiber bundle that has been drafted by a draft device having a draft roller pair into an air spinning device having an introduction path that guides the fiber bundle to the downstream side while biasing the fiber bundle to one side according to the swirling direction of the swirling airflow In
A first step of drafting the fiber bundle with the draft device;
A groove is formed on the surface of at least one of the draft rollers. When viewed from the other draft roller, the groove has an end portion of the groove on the same side as the side where the fiber bundle is biased in the introduction path. A second step of niping the fiber bundle and feeding it toward the introduction path by a draft roller pair configured to be inclined upstream in the transport direction;
A spinning method characterized by comprising:

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