JP6720781B2 - Fiber bundle concentrator in spinning machine - Google Patents

Description

The present invention relates to a fiber bundle collecting device in a spinning machine.

Various fiber bundle concentrators have been proposed for the purpose of preliminarily concentrating a drafted fiber bundle before twisting it and improving yarn quality such as reduction of fluff.
As shown in FIG. 6, the fiber bundle focusing device disclosed in Patent Document 1 is provided on the downstream side of the final delivery roller pair 51 of the draft device 50, and a delivery unit 53 including a pair of nip rollers 52a and 52b, A suction pipe 54 having a guide surface 54b provided on the upstream side in the moving direction of the fiber bundle F with respect to the nip point of the delivery portion 53 and having a suction hole 54a. Further, the fiber bundle collecting device is wound around the guide portion 56, the suction pipe 54, the nip roller 52a, and the guide portion 56, which are provided on the downstream side in the moving direction of the fiber bundle F with respect to the nip point of the delivery portion 53. And a rotating ventilation apron 57. The guide portion 56 guides the ventilation apron 57 so as to move to a position away from the nip roller 52a on the side opposite to the fiber bundle guide side of the nip roller 52a, and the ventilation apron 57 is planar on the outside of the guide portion 56. It is formed to guide you. The suction pipe 54 extends in parallel with a suction duct (not shown) arranged in the machine frame of the spinning machine so as to extend in the longitudinal direction (direction perpendicular to the plane of the drawing), and through the connecting pipe 58. It is connected to the suction duct.

Further, as a fiber bundle focusing device, a porous transfer belt (ventilation apron) is wrapped around a hollow pipe having a slide surface provided with suction slits (suction holes), and the transfer belt presses the transfer belt against the slide surface. A structure driven by a nipping roller (apron driving roller) is also disclosed (Patent Document 2).

JP, 2008-95233, A JP 2000-34631 A

In the fiber bundle focusing device having a configuration in which a part of the ventilation apron is wrapped around the suction pipe, when the fiber bundle passes over the suction holes (slits), the ends of the fibers that form the fiber bundle are sucked, It may enter the hole of the ventilation apron 57. Then, the fiber bundle in which the ends of the fibers have entered the holes of the ventilation apron 57 is pulled by the yarn (fiber bundle F) in the twisted portion while being sandwiched between the inner surface of the ventilation apron 57 and the outer surface of the nip roller 52a.

When the tension of the yarn at the twisting portion is weak, such as in the case of sweet twist spinning, the fiber bundle cannot be peeled off from the ventilation apron, and yarn breakage may occur. This yarn breakage can occur even if the final delivery part is not a roller pair as in the fiber bundle concentrating device of Patent Document 2, as long as the ventilation apron is wound around the final delivery part.

The present invention has been made in view of the above problems, and an object thereof is a spinning machine capable of suppressing yarn breakage that occurs when the ends of the fibers that form the fiber bundle enter the holes of the ventilation apron. To provide a fiber bundle converging device.

A fiber bundle concentrating device for solving the above-mentioned problems is a suction pipe having a guide surface having a suction hole, at least a ventilation apron wound around the suction pipe, and the ventilation apron provided downstream of a draft part. And an apron drive roller for driving the apron, and a final delivery roller pair is provided on the downstream side of the ventilation apron.

According to this configuration, since the final delivery roller pair is provided on the downstream side of the apron drive roller around which the ventilation apron is wound, when the fiber bundle passes over the suction holes, the fibers forming the fiber bundle are formed. Even if the end of the fiber enters the hole of the ventilation apron, the fiber bundle is peeled from the ventilation apron by the force of pulling by the final delivery roller pair. As a result, it is possible to suppress yarn breakage that occurs when the ends of the fibers that form the fiber bundle enter the holes of the ventilation apron.

Further comprising an apron pressing roller for pressing the apron to the drive roller, a part of the roller in the previous SL pressing row La and the final delivery roller pair are commonly provided. According to this structure, when the fiber bundle moves between the ventilation apron and the final delivery roller pair, the fiber bundle always moves in contact with the common roller. Therefore, the fiber arrangement of the bundled fiber bundle is prevented from being disturbed. Further, the number of parts constituting the fiber bundle collecting device is reduced. Further, some rollers are commonly provided for the apron drive roller and the final delivery roller pair.

If some of the rollers are commonly provided between the apron driving low la and the final delivery roller pair, it is preferable that the suction pipe is provided on the top side. When the suction pipe is provided on the top side, the common roller is provided on the bottom side, so that the number of rollers on the bottom side that configures the fiber bundle collecting device is reduced, and the cotton wool is less likely to collect.

A guide rod for guiding the ventilation apron is provided between the apron driving roller and the final delivery roller pair. According to this structure, the ventilation apron moves in a state of coming into contact with the surface of the guide rod opposite to the surface facing the apron drive roller after passing through the nip point between the common roller and the apron drive roller. As a result, the fiber bundle that moves between the final delivery roller and the ventilation apron drive roller is guided by the guide rod, and the distance that the fiber bundle moves in contact with the common roller increases. Therefore, it is possible to prevent the fiber quality of the bundled fiber bundle from being disturbed and the yarn quality from being degraded.

The apron drive roller or a pressing roller for pressing the ventilation apron against the apron drive roller is formed to have a smaller diameter than other rollers constituting the fiber bundle concentrator. According to this configuration, as compared with the case where the apron drive roller is formed with a diameter larger than that of other rollers constituting the fiber bundle concentrating device, the fiber bundle has a shorter distance that one side thereof moves in a free state, Disturbance of the fiber arrangement of the bundled fiber bundle is suppressed.

According to the present invention, it is possible to suppress yarn breakage due to the end portions of the fibers constituting the fiber bundle entering the holes of the ventilation apron.

(A) is a partially broken schematic side view of the first embodiment, and (b) is a partially enlarged view of (a). The partially broken schematic side view of 2nd Embodiment. The partially broken schematic side view of 3rd Embodiment. The partially broken schematic side view of 4th Embodiment. The partially broken schematic side view of 5th Embodiment. The partially broken schematic side view of the conventional apparatus.

(First embodiment)
Hereinafter, a first embodiment in which the present invention is embodied in a fiber bundle collecting device equipped in a spinning machine will be described with reference to FIG.

As shown in FIG. 1A, the draft device 10 includes a draft part 11 and a fiber bundle focusing device 20 that focuses the fiber bundle F drafted by the draft part 11.
The draft part 11 has a three-wire configuration including a front bottom roller 12a, a middle bottom roller 13a, and a back bottom roller 14a. The front bottom roller 12a is supported at a predetermined position with respect to the roller stand 15, and the middle bottom roller 13a and the back bottom roller 14a are supported via a support bracket fixed to the roller stand 15 such that the position thereof can be adjusted in the front-rear direction. ing. The bottom apron 16 is wound around the bottom tenser 17 and the middle bottom roller 13a.

A front top roller 12b, a middle top roller 13b, and a back top roller 14b are attached to the weighting arm 18, respectively, at positions corresponding to the front bottom roller 12a, the middle bottom roller 13a, and the back bottom roller 14a via a top roller supporting member. It is supported as one set of two weights.

The weighting arm 18 has a lever 18a rotatably arranged between a pressing position and a releasing position. In the state where the lever 18a is arranged in the pressurizing position where it abuts against the frame 18b of the weighting arm 18 shown in FIG. 1, the weighting arm 18 moves the top rollers 12b, 13b, 14b supported by the weighting arm 18 from each other. The bottom rollers 12a, 13a, 14a are held in a locked state at a pressing position (spinning position) where they are pressed toward the side. Further, when the lever 18a is rotated from the state shown in FIG. 1 to the upper release position, the locked state is released.

As shown in FIG. 1A, the fiber bundle collecting device 20 is arranged on the downstream side of the front bottom roller 12 a and the front top roller 12 b of the draft part 11.
As shown in FIGS. 1A and 1B, the fiber bundle collecting device 20 includes a suction pipe 21 having a guide surface 22 having suction holes 22a, a ventilation apron 23 wound around the suction pipe 21, The ventilation apron 23 is wound around and includes an apron drive roller 24 that drives the ventilation apron 23 and a guide portion 25. The ventilation apron 23 only needs to have appropriate air permeability, and is formed of, for example, a belt or a mesh made of rubber or resin having elasticity and formed of a mesh.

Further, the fiber bundle collecting device 20 includes a top nip roller 26 as a pressing roller that presses the ventilation apron 23 against the apron driving roller 24, and a final delivery roller pair 27 that is provided downstream of the ventilation apron 23. ..

More specifically, the suction pipe 21 is arranged on the downstream side of the front bottom roller 12a, the guide surface 22 is curved so as to be convex outward, and the suction hole 22a intersects the longitudinal direction of the suction pipe 21. It is formed so as to extend in the direction. The suction holes 22a are formed so as to extend over substantially the entire length of the guide surface 22 in the width direction (direction orthogonal to the longitudinal direction of the suction pipe 21).

Gears are rotatably provided on the rotating shaft of the apron driving roller 24 and the rotating shaft of the front bottom roller 12a, respectively, and the rotation of the front bottom roller 12a is controlled by the apron driving roller 24 via an intermediate gear that meshes with both gears. To be transmitted to.

The guide portion 25 is provided on the downstream side in the moving direction of the fiber bundle F with respect to the fiber bundle nip point between the ventilation apron 23 and the top nip roller 26, and the ventilation apron 23 is opposite to the fiber bundle guide side of the apron drive roller 24. On the side, it guides to move a position away from the apron drive roller 24. The guide portion 25 has a function of giving tension to the ventilation apron 23.

The final delivery roller pair 27 is composed of a final delivery bottom roller 28 arranged downstream of the apron drive roller 24 and a final delivery top roller 29 arranged downstream of the top nip roller 26. ing. The final delivery bottom roller 28 is provided in a state of being supported by the roller stand 15 via a support bracket (not shown). The surface speed of the final delivery roller pair 27 is set to be substantially the same as the surface speed of the ventilation apron 23. The surface speed of the ventilation apron 23 is set to be substantially the same as the surface speed of the front bottom roller 12a of the draft part 11. The final delivery roller pair 27 is configured to be actively driven like the bottom rollers 12a, 13a, 14a. For example, it is adapted to be driven via a gear train by a motor provided at the gear end of the machine base.

The top nip roller 26 and the final delivery top roller 29 are supported by the weighting arm 18 via a common supporting member 30 like the front top roller 12b, the middle top roller 13b, and the back top roller 14b of the draft part 11. .. Then, in a state where the lever 18a of the weighting arm 18 is arranged in the pressing position, the top nip roller 26 presses the ventilation apron 23 by the force of a spring (not shown), and the final delivery top roller 29 drives the final delivery bottom roller 28. It is configured to press.

Next, the operation of the device configured as described above will be described.
When the spinning machine is operated, the fiber bundle F is drafted by the draft part 11, and then sent to the fiber bundle focusing device 20 by the front bottom roller 12a and the front top roller 12b of the draft part 11. The ventilation apron 23 and the top nip roller 26 are rotated at almost the same speed as the surface speed of the front bottom roller 12a, and the fiber bundle F is delivered to the final delivery roller pair 27 after passing the nip point of the ventilation apron 23 and the top nip roller 26. To be done. At that time, the suction action of the suction holes 22 a formed in the guide surface 22 of the suction pipe 21 reaches the fiber bundle F via the ventilation apron 23. Then, the fiber bundle F moves to a position corresponding to the suction hole 22a while being suction-focused.

The fiber bundle F delivered from the apron drive roller 24 and the top nip roller 26 passes through the nip point of the final delivery roller pair 27 rotated at a speed substantially the same as the surface speed of the ventilation apron 23. The final delivery roller pair 27 plays a role of stopping the twist coming from the twisting portion on the downstream side of the final delivery roller pair 27. Then, the fiber bundle that has passed through the nip point of the final delivery roller pair 27 is turned by the final delivery bottom roller 28 and moves to the downstream side while being twisted.

That is, since the final delivery roller pair 27 is provided on the downstream side of the apron driving roller 24 around which the ventilation apron 23 is wound, the fiber bundle F is formed when the fiber bundle F passes over the suction holes 22a. Even if the ends of the fibers to be inserted into the holes of the ventilation apron 23, the fiber bundle F is peeled off from the ventilation apron 23 by the force of the final delivery roller pair 27. As a result, it is possible to suppress yarn breakage that occurs when the ends of the fibers that form the fiber bundle F enter the holes of the ventilation apron 23.

According to this embodiment, the following effects can be obtained.
(1) The fiber bundle collecting device 20 is provided on the suction pipe 21 having the guide surface 22 having the suction hole 22a, the ventilation apron 23 wound around the suction pipe 21, and on the downstream side of the draft part 11. An apron drive roller 24 for driving the ventilation apron 23 is provided, and a final delivery roller pair 27 is provided on the downstream side of the ventilation apron 23.

According to this configuration, since the final delivery roller pair 27 is provided on the downstream side of the apron driving roller 24 around which the ventilation apron 23 is wound, when the fiber bundle F passes over the suction holes 22a, the fibers Even if the ends of the fibers forming the bundle F enter the holes of the ventilation apron 23, the fiber bundle F is peeled off from the ventilation apron 23 by the force of the final delivery roller pair 27. As a result, it is possible to suppress yarn breakage that occurs when the ends of the fibers that form the fiber bundle F enter the holes of the ventilation apron 23.

(Second embodiment)
Next, a second embodiment will be described with reference to FIG.
The fiber bundle collecting device 20 of this embodiment does not have the top nip roller 26 and the final delivery top roller 29 corresponding to the apron drive roller 24 and the final delivery bottom roller 28, respectively, but does not have the apron drive roller 24 and the final delivery bottom roller 28. The point that a common top roller (pressing roller) is provided for both and is largely different from the first embodiment. The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

As shown in FIG. 2, the fiber bundle collecting device 20 includes three rollers, an apron driving roller 24, a final feeding bottom roller 28, and a common pressing roller 31 shared by the apron driving roller 24 and the final feeding bottom roller 28. Equipped with. That is, the common pressing roller 31 is provided commonly to the apron drive roller 24 and the final delivery bottom roller 28. The common pressing roller 31 is supported by the weighting arm 18 via the supporting member 30.

The apron drive roller 24 has a smaller diameter than the final delivery bottom roller 28 and the common pressing roller 31. The common pressing roller 31 is arranged at a position for pressing the apron driving roller 24 via the ventilation apron 23 and the final delivery bottom roller 28 when the lever 18a of the weighting arm 18 is arranged at the pressing position. To be done.

In the first embodiment, the fiber bundle F that has passed through the pressing portion of the top nip roller 26 that presses the apron drive roller 24 via the ventilation apron 23 is pressed by the final delivery bottom roller 28 and the final delivery top roller 29. Up to the position where the fiber bundle F moves straight with both sides free. However, in this embodiment, when the fiber bundle F moves between the ventilation apron 23 and the final delivery roller pair 27, the fiber bundle F always moves in contact with the common pressing roller 31. Therefore, unlike the case where both surfaces of the fiber bundle F move in a free state, the fiber arrangement of the bundled fiber bundle F is suppressed from being disturbed.

Further, the apron drive roller 24 is formed to have a smaller diameter than the other rollers (final delivery bottom roller 28, common pressing roller 31) constituting the fiber bundle collecting device 20. Therefore, as compared with the case where the apron drive roller 24 is formed to have a diameter larger than that of the other rollers forming the fiber bundle concentrating device 20, the fiber bundle F is transferred from the position pressed by the ventilation apron 23 to the final delivery bottom roller 28. The distance moved to the pressed position is shortened, and disorder of the fiber arrangement of the bundled fiber bundles F is further suppressed.

According to the second embodiment, the following effect can be obtained in addition to the same effect as (1) in the first embodiment.
(2) A pressing roller that presses the ventilation apron 23 against the apron driving roller 24 is further provided, and a part of the rollers (common pressing roller 31) in the roller pair composed of the apron driving roller 24 and the pressing roller and the final delivery roller pair 27. It is provided in common. Therefore, when the fiber bundle F moves between the ventilation apron 23 and the final delivery roller pair 27, the fiber bundle F always moves in contact with the pressing roller (common pressing roller 31). Therefore, the fiber arrangement of the bundled fiber bundle F is suppressed from being disturbed. Further, the number of parts constituting the fiber bundle collecting device 20 is reduced, the cost is reduced, and the installation space is easily secured.

(3) The apron drive roller 24 is formed to have a smaller diameter than the other rollers (final delivery bottom roller 28, common pressing roller 31) constituting the fiber bundle collecting device 20. Therefore, as compared with the case where the apron drive roller 24 is formed to have a diameter larger than that of the other rollers constituting the fiber bundle collecting device 20, the distance that the fiber bundle F moves becomes shorter, and the fiber arrangement of the bundled fiber bundle F becomes smaller. Disturbance is further suppressed.

(Third Embodiment)
Next, a third embodiment will be described with reference to FIG.
In the fiber bundle collecting device 20 of this embodiment, the number of rollers constituting the fiber bundle collecting device 20 is three as in the second embodiment, but the suction pipe 21 is provided on the top side, and the ventilation apron 23 is provided. Is provided so as to be in contact with the fiber bundle F from the upper side, which is a great difference from the first and second embodiments. The same parts as those in the first and second embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 3, in the fiber bundle collecting device 20 of this embodiment, the top nip roller 26 and the final delivery bottom roller are not provided in correspondence with the top nip roller 26 and the final delivery top roller 29, respectively. A common bottom roller 32 as an apron driving roller is provided as a bottom roller common to the top roller 29. The suction pipe 21 and the top nip roller 26 are supported by the weighting arm 18 via a support member 30.

The top nip roller 26 (pressing roller) has a smaller diameter than the final delivery top roller 29 and the common bottom roller 32. The common bottom roller 32 is arranged at a position for pressing the apron driving roller 24 via the ventilation apron 23 and pressing the final delivery top roller 29 when the lever 18a of the weighting arm 18 is arranged at the pressing position. Has been done. The fiber bundle collecting device 20 does not include the guide portion 25.

Although the number of rollers on the bottom side is two in the fiber bundle collecting device 20 of the first and second embodiments, in the fiber bundle collecting device 20 of this embodiment, the bottom roller is the common bottom roller. Since 32 is provided, the number of rollers on the bottom side constituting the fiber bundle collecting device 20 is reduced to one. As a result, as compared with the fiber bundle focusing device 20 of the first embodiment and the second embodiment, the cotton wool is less likely to accumulate.

According to the third embodiment, the following effects can be obtained in addition to the same effects as (1) in the first embodiment and (3) in the second embodiment.
(4) A roller comprising the common bottom roller 32 (apron driving roller) and the top nip roller 26 (pressing roller), further comprising a top nip roller 26 (pressing roller) that presses the ventilation apron 23 against the common bottom roller 32 (apron driving roller). Some of the rollers (common bottom roller 32) are commonly provided by the pair and the final delivery roller pair 27. Therefore, when the fiber bundle F moves between the ventilation apron 23 and the final delivery roller pair 27, the fiber bundle F always moves in contact with the pressing roller (common bottom roller 32). Therefore, the fiber arrangement of the bundled fiber bundle F is suppressed from being disturbed. Further, the number of parts constituting the fiber bundle collecting device 20 is reduced, the cost is reduced, and the installation space is easily secured.

(5) Since the fiber bundle collecting device 20 does not include the guide portion 25, the number of parts is reduced accordingly.
(Fourth Embodiment)
Next, a fourth embodiment will be described with reference to FIG.

As in the third embodiment, the fiber bundle focusing device 20 has three rollers constituting the fiber bundle focusing device 20, and the ventilation apron 23 is provided in a state of contacting the fiber bundle F from above. However, the difference is that a guide rod 33 for guiding the ventilation apron 23 is provided between the top nip roller 26 and the final delivery top roller 29. The same parts as those in the third embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

In this embodiment, the ventilation apron 23 moves in a state of contacting the surface of the guide rod 33 opposite to the side opposite to the top nip roller 26 after passing through the nip point between the top nip roller 26 and the common bottom roller 32. .. As a result, the surface of the fiber bundle F moving in contact with the common bottom roller 32 on the side opposite to the surface in contact with the common bottom roller 32 is wider than the ventilation apron 23, as compared with the case without the guide rod 33. It moves while touching the area. Therefore, as compared with the fiber bundle collecting device 20 of the third embodiment, the fiber arrangement of the bundled fiber bundles F is further suppressed from being disturbed, and the deterioration of the yarn quality can be further suppressed.

(Fifth Embodiment)
Next, a fifth embodiment will be described with reference to FIG.
As shown in FIG. 5, in the fiber bundle collecting device 20, the top nip roller 26 that presses the fiber bundle F toward the ventilation apron 23 is an apron drive roller, which is greatly different from the first to fourth embodiments. There is. The same parts as those in each of the above-described embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIG. 5, in the fiber bundle collecting device 20, the suction pipe 21 is arranged at a position facing the top nip roller 26, and a guide roller 38 around which the ventilation apron 23 is wound is provided below the suction pipe 21. .. The suction pipe 21 is formed in a shape in which a large-diameter circular arc portion 34 and a small-diameter circular arc portion 35 are connected by two flat plate portions 36a and 36b, and one flat plate portion 36a having a suction hole 22a is formed in the draft part 11. It is provided so as to be located on the extension line of the moving direction of the fiber bundle. A final delivery roller pair 27 is provided on the downstream side of the ventilation apron 23. The top nip roller 26 is driven by the front top roller 12b of the draft part 11 via a drive belt 37.

Also in this embodiment, when the fiber bundle F passes over the suction holes 22a, the ends of the fibers forming the fiber bundle F may be sucked and enter the holes of the ventilation apron 23. However, the fiber bundle F is peeled off from the ventilation apron 23 by the force of pulling by the final delivery roller pair 27. As a result, it is possible to suppress yarn breakage that occurs when the ends of the fibers that form the fiber bundle F enter the holes of the ventilation apron 23.

The embodiment is not limited to the above embodiment, and may be embodied as follows, for example.
As in the first embodiment, in the configuration in which the fiber bundle collecting device 20 includes four rollers, the apron drive roller 24, the top nip roller 26, the final delivery bottom roller 28, and the final delivery top roller 29, the suction pipe 21, the ventilation apron 23 and the apron drive roller 24 may be provided on the upper side (top side). When the suction pipe 21, the ventilation apron 23, and the apron drive roller 24 are provided on the upper side (top side), it is preferable in terms of space compared to the case where they are provided on the lower side (bottom side).

As in the second embodiment, in the configuration in which the fiber bundle collecting device 20 includes the common pressing roller 31 shared by the apron drive roller 24 and the final delivery bottom roller 28, the apron drive roller 24 and the final delivery bottom roller 28 are provided. A guide rod 33 for guiding the ventilation apron 23 may be provided between the roller 28 and the roller 28. Also in this case, in addition to the same effect as in the second embodiment, by providing the guide rod 33, the fiber bundle that moves in contact with the common pressing roller 31 as compared with the case without the guide rod 33. The surface of F on the side opposite to the surface in contact with the common pressing roller 31 moves in contact with the ventilation apron 23 over a wide area. Therefore, as compared with the fiber bundle collecting device 20 of the second embodiment, the fiber arrangement of the bundled fiber bundles F is further suppressed from being disturbed, and the deterioration of the yarn quality can be further suppressed.

In the configuration in which the fiber bundle collecting device 20 includes four rollers as in the first embodiment, the guide rod 33 that guides the ventilation apron 23 to the side of the apron drive roller 24 that corresponds to the final delivery bottom roller 28. May be provided. Further, in the configuration in which the fiber bundle collecting device 20 includes four rollers and the suction pipe 21 is provided on the upper side, a guide rod for guiding the ventilation apron 23 to the side of the apron driving roller 24 corresponding to the final delivery top roller 29. 33 may be provided.

In the configuration in which the ventilation apron 23 and the suction pipe 21 are provided on the bottom side as in the first and second embodiments, the guide portion 25 that guides the ventilation apron 23 may be omitted.

The guide portion 25 for guiding the ventilation apron 23 may be provided in the configuration in which the ventilation apron 23 and the suction pipe 21 are provided on the top side as in the third embodiment and the fourth embodiment.

The guide portion 25 may have any shape and configuration as long as it has a function of giving tension to the ventilation apron 23.
The rollers constituting the fiber bundle collecting device 20, that is, the apron drive roller 24, the top nip roller 26, the final delivery bottom roller 28, and the final delivery top roller 29 are all the same in size, or the apron drive roller 24 is larger than the other rollers. The size of each roller is not limited to a small combination, and may be set appropriately. However, if the diameter of the final delivery bottom roller 28 forming the final delivery roller pair 27 is made too small, the yarn is likely to be wound around the final delivery bottom roller 28 at the time of yarn breakage.

The draft part 11 is not limited to the 3-wire type and may be the 4-wire type.

11... Draft part, 20... Fiber bundle collecting device, 21... Suction pipe, 22... Guide surface, 22a... Suction hole, 23... Ventilation apron, 24... Apron driving roller, 26... Top nip roller as pressing roller, 27... Final Delivery roller pair, 33... Guide rod.

Claims (3)

A suction pipe having a guide surface having a suction hole, at least a ventilation apron wrapped around the suction pipe, and an apron drive roller provided downstream of the draft part and driving the ventilation apron,
A final delivery roller pair is provided on the downstream side of the ventilation apron ,
Further comprising a pressing roller for pressing the ventilation apron to the apron driving roller,
One of the apron drive roller and the pressing roller is provided in common with a top roller or a bottom roller of the final delivery roller pair, and a fiber bundle collecting device for a spinning machine. The fiber bundle focusing device for a spinning machine according to claim 1, wherein a guide rod that guides the ventilation apron is provided between the apron drive roller and the final delivery roller pair. The fiber in the spinning machine according to claim 1 or 2 , wherein the apron drive roller or a pressing roller that presses the ventilation apron against the apron drive roller is formed to have a smaller diameter than other rollers constituting the fiber bundle concentrator. Bundle focusing device.

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