JP2011122273A - Device for gathering fiber bundle in spinning machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for gathering fiber bundle, exhibiting an excellent effect capable of improving the gathering property of the fiber bundle. <P>SOLUTION: At a guiding surface 28 of a sucking pipe 15, a sucking slit 27 is formed. One side of a side edge 29 in the pair of side edges 29, 30 at the width direction H of the sucking slit 27 constitutes a guiding edge for gathering the fiber bundle F. At the guiding surface 28 in the outside direction of the side edge 30, the side wall 31 of a cover 33 is installed as standing, and at the upper end of the side wall 31, a coated wall 32 of the cover 33 is formed as linked in one unit. At the inside surface of the side wall 31 and the inside surface of the coated wall 32, a projecting part 331 is formed as one unit. The projecting part 331 projects toward an aerated conveyer belt 16 at the outside direction of the side edge 30 and also up to this side of the sidewall 31. Between the aerated conveying belt 16 and coated wall 32, an air flow-introducing gap S is installed so as to open up to the outside direction of the guide edge 29. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

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

  For example, Patent Document 1 discloses a fiber bundle concentrating device that condenses a drafted fiber bundle (sliver) in advance before twisting. The fiber bundle concentrating device disclosed in Patent Document 1 includes a hollow molded member (suction pipe) provided downstream of the exit roller pair (final roller pair) of the draft device in the fiber bundle moving direction, and a peripheral surface of the hollow molded member. And a porous conveyor belt wound around the sliding surface. A suction slit (suction slit) is provided on the sliding surface of the hollow molded member, and the suction slit is covered with a transport belt. A clamping roller is provided in the vicinity of the downstream end of the hollow molded member in the fiber bundle moving direction. The tightening roller moves the conveyor belt while pressing the fiber bundle and the conveyor belt on the peripheral surface of the hollow molding member.

  The suction slit is formed so as to be inclined with respect to the moving direction of the fiber bundle, and one side edge of the suction slit constitutes a fiber guide edge. A sliver is covered with a cover between the exit roller pair and the tightening roller. The cover is composed of a support portion connected to the sliding surface on the outer side of the fiber guide edge, and a covering wall integrally formed on the upper end of the support portion, and the cover wall on the side opposite to the fiber guide edge An air inflow gap is formed between the conveyor belt.

JP 2002-69762 A

  Patent Document 1 describes that the cover is for further improving the compression (focusing) of the sliver. However, since the support portion of the cover is erected on the outer side of the fiber guide edge, there is little airflow flowing from the outer side of the fiber guide edge to the fiber guide edge side. Therefore, the airflow for moving the fiber bundle entering the suction slit side from the outer side of the fiber guide edge to the fiber guide edge side from the outer side of the fiber guide edge is insufficient, and the fiber bundle is not sufficiently focused. This results in a decrease in yarn quality.

  An object of this invention is to improve the convergence of a fiber bundle.

  The present invention is provided on the downstream side of the final delivery roller pair of the draft device, and is moved in a state of being wound around a suction pipe provided with a suction slit and a guide surface of the suction pipe so as to cover the suction slit. A fiber bundle focusing device in a spinning machine, wherein one side edge of a pair of side edges in the width direction of the suction slit is formed as a guide edge for focusing the fiber bundle. In the first aspect of the invention, a cover that covers the upper side of the suction slit and the outer side of the side edge opposite to the guide edge is provided, and the air flow introduction gap is provided between the guide edge and the cover. It has been.

  The outer side of the side edge opposite to the guide edge is the area on the opposite side of the suction slit with the suction slit as the inner side, and the outer side of the guide edge is the inner side of the suction slit. The region on the opposite side of the suction slit from the guide edge. The outer side of the side edge and the outer side of the guide edge are on opposite sides with respect to the suction slit.

  The airflow flows from the outside of the guide edge to the suction slit, but the airflow from above the suction slit and the airflow from the side edge opposite to the guide edge to the suction slit are blocked by the cover. Therefore, the airflow flowing from the outer side of the guide edge to the suction slit via the airflow introduction gap is increased, and the convergence property of the fiber bundle is improved.

In a preferred example, the cover includes a covering wall covering the suction slit, and a leading edge on the guide edge side of the covering wall reaches an outer side of the guide edge.
Such a configuration is preferable in that the direction of the airflow flowing from the outside of the guide edge to the suction slit via the airflow introduction gap is brought close to a state parallel to the guide surface.

In a preferred example, the covering wall includes an overhanging portion that protrudes toward the ventilating conveyance belt on the outer side of the opposite side edge.
The overhanging part suppresses the inflow of airflow from the upstream end side of the suction slit or from the downstream end side of the suction slit, thereby contributing to improvement of convergence.

In a preferred example, the cover includes the covering wall and a side wall covering an outer side of the opposite side edge, and the covering wall and the side wall are integrally formed.
In a preferred example, the covering wall has a hole penetrating from the outside of the covering wall to the inside of the covering wall, and the hole is close to the upstream end of the suction slit and on the opposite side edge. It is provided outside.

  The airflow flowing from the outside of the coating wall to the inside of the coating wall through the hole moves the fiber bundle entering the suction slit side from the outside of the opposite side edge to the guide edge side, thereby improving convergence. Contribute.

  The present invention has an excellent effect that the convergence of the fiber bundle can be improved.

The 1st Embodiment is shown and (a) is a partial fracture side view of a fiber bundle focusing device. (B) is a partial top view. (A) is a partial top view which shows the relationship between the suction pipe of a fiber bundle focusing apparatus and a conveyance belt. (B) is the sectional view on the AA line of Fig.2 (a). (A) is a graph which shows the relationship between the movement position of a fiber bundle, and hairliness. (B) is a graph showing the relationship between the movement position of the fiber bundle and the yarn strength. Sectional drawing which shows 2nd Embodiment. 3rd Embodiment is shown and (a) is a partial enlarged plan view. (B) is the BB sectional drawing of Fig.5 (a). (A) is a graph which shows the relationship between the movement position of a fiber bundle, and hairliness. (B) is a graph showing the relationship between the movement position of the fiber bundle and the yarn strength. Another embodiment is shown, (a) is a partially enlarged plan view. (B) is CC sectional view taken on the line of Fig.7 (a). Sectional drawing which shows another embodiment. Sectional drawing which shows another embodiment.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1A, the fiber bundle concentrating device 11 is provided on the downstream side of the final delivery roller pair 13 of the draft device 12. The fiber bundle concentrating device 11 includes a delivery unit 14, a suction pipe 15, a ventilation conveyance belt 16, and a guide unit 17. The final delivery roller pair 13 includes a front bottom roller 131 and a front top roller 132.

  The delivery unit 14 includes a rotary shaft 18 disposed in parallel with the front bottom roller 131, a bottom nip roller 181 formed on the rotary shaft 18, and a top nip roller 19 pressed against the bottom nip roller 181 via the ventilation conveyance belt 16. And is composed of. Similarly to the front top roller 132, the top nip roller 19 is supported by a weighting arm (not shown) via the support member 20 every two spindles. The support member 20 is formed integrally with a support member (not shown) of the front top roller 132. The suction pipe 15 is provided on the upstream side in the moving direction of the fiber bundle F with respect to the nip point of the delivery unit 14 (the contact point between the top nip roller 19 and the ventilation conveyance belt 16).

  Roller stands 21 are arranged at predetermined intervals in the longitudinal direction of the spinning machine (the direction perpendicular to the paper surface of FIG. 1A). A support arm (not shown) is disposed at an intermediate position between the adjacent roller stands 21 while being supported by a support beam (not shown) extending in the longitudinal direction of the spinning machine. A rotating shaft 18 is supported between 21 and the support arm. A gear 22 is provided at an intermediate portion in the longitudinal direction of the rotating shaft 18 so as to be able to rotate integrally with the rotating shaft 18.

  A gear portion 133 is formed on the front bottom roller 131 at a position facing the gear 22. An intermediate gear 25 is rotatably supported by a support arm 24 fixed to the support beam. The intermediate gear 25 meshes with the gear portion 133 and the gear 22. The rotational force of the front bottom roller 131 is transmitted to the rotary shaft 18 through the gear part 133, the intermediate gear 25 and the gear 22.

  A suction duct (not shown) is disposed on the machine base of the spinning machine so as to extend in the longitudinal direction of the machine base. The suction pipe 15 is connected to the suction duct via the connection pipe 26 in a state extending in parallel with the suction duct. The suction pipe 15 includes a guide surface 28, and a suction slit 27 is formed in the guide surface 28. The guide surface 28 is a curved surface that protrudes from the inside to the outside of the suction pipe 15.

  The ventilation conveyance belt 16 is wound around the suction pipe 15, the guide portion 17, and the bottom nip roller 181, and the suction slit 27 is covered with the ventilation conveyance belt 16. The ventilation conveyance belt 16 is formed of a woven fabric that can ensure appropriate ventilation.

  As the rotary shaft 18 rotates, the bottom nip roller 181 and the top nip roller 19 rotate in opposite directions, and the ventilation conveyance belt 16 sandwiched between the bottom nip roller 181 and the top nip roller 19 is moved in the direction of arrow R. The As a result, the fiber bundle F sandwiched between the top nip roller 19 and the ventilating and conveying belt 16 is moved from the upstream end 271 side to the downstream end 272 side of the suction slit 27.

  As shown in FIG. 1B, the suction slit 27 is formed in a state of being inclined with respect to the conveyance direction of the ventilation conveyance belt 16 on the guide surface 28. One side edge 29 of the pair of side edges 29, 30 in the width direction of the suction slit 27 (the direction indicated by the arrow H in FIG. 2A and the longitudinal direction of the suction pipe 15) is the fiber bundle F. A converging guide edge (hereinafter referred to as a guide edge 29) is formed. The width of the suction slit 27 is a shape that narrows from the upstream side toward the downstream side in the conveyance direction R of the ventilation conveyance belt 16.

  As shown in FIGS. 2A and 2B, a cover 33 is provided to cover the upper side of the suction slit 27 and the outer side of the side edge 30 opposite to the guide edge 29. A side wall 31 constituting the cover 33 is erected on the guide surface 28 on the outer side (left side of the side edge 30) of the side edge 30, and a covering wall 32 constituting the cover 33 is integrally formed on the upper end of the side wall 31. It is formed by connecting. The outer side of the side edge 30 is a region opposite to the suction slit 27 with the suction slit 27 as the inner side and the side edge 30 as a boundary. The base end of the side wall 31 (the end on the guide surface 28 side) is in contact with the guide surface 28 so as not to form a gap with the guide surface 28, and the covering wall 32 is between the side wall 31. It connects with the side wall 31 so that a clearance gap may not be produced.

  The distance between the inner surface 320 of the covering wall 32 and the guide surface 28 is constant everywhere. A protruding portion 331 is integrally formed on the inner surface of the side wall 31 (the surface facing the suction slit 27 side) and the inner surface of the covering wall 32. The overhang portion 331 protrudes toward the ventilating and conveying belt 16 on the outer side of the side edge 30 and to the front of the side edge 30, and a slight gap is provided between the overhanging portion 331 and the ventilating and conveying belt 16. ing.

  As shown in FIG. 2A, the leading edge 321 of the covering wall 32 is slightly inclined with respect to the conveying direction R of the ventilation conveying belt 16 on the guide surface 28, and the covering in the width direction H of the suction slit 27 is performed. The length of the wall 32 increases in the direction opposite to the conveyance direction R of the ventilation conveyance belt 16. That is, the length of the covering wall 32 in the width direction H of the suction slit 27 is longer on the upstream end 271 side of the suction slit 27 than on the downstream end 272 side of the suction slit 27. The leading edge 321 of the covering wall 32 in the width direction H of the suction slit 27 is on the outer side of the guide edge 29 (on the right side of the guide edge 29 in FIG. 2A), and the covering wall 32 is in the width direction of the suction slit 27. The guide surface 28 is covered to a position beyond the guide edge 29 in H.

  The covering wall 32 is provided so as to be separated from the suction slit 27 directly above and cover most of the suction slit 27. In the present embodiment, the upstream end 271 and the downstream end 272 of the suction slit 27 are out of the covering range of the covering wall 32.

  The side wall 31 and the covering wall 32 extend from the guide surface 28 on the outer side of the side edge 30 (left side of the side edge 30 in FIG. 2A) to the outer side of the guide edge 29 [in FIG. A cover 33 that extends above the right guide surface 28 is formed. The outer side of the guide edge 29 is a region opposite to the suction slit 27 with the suction slit 27 on the inner side and the guide edge 29 as a boundary. The outer side of the side edge 30 and the outer side of the guide edge 29 are opposite to each other with respect to the suction slit 27. The cover 33 is supported by the support member 20 via a bracket (not shown). By arranging a waiting arm (not shown) at the release position, the cover 33 can be separated from the suction pipe 15 together with the top nip roller 19 and the like.

An airflow introduction gap S is provided between the surface of the ventilation conveyance belt 16 and the leading edge 321 of the covering wall 32 so as to open to the outside of the guide edge 29.
The fiber bundle F moves while performing a traverse motion by the action of a traverse device (not shown). The traverse motion speed is set to a sufficiently smaller speed than the moving speed of the fiber bundle F. The upstream end 271 of the suction slit 27 is orthogonal to the transport direction R of the ventilation transport belt 16, and the suction slit 27 starts from the nip point of the final delivery roller pair 13 even if the position of the fiber bundle F changes due to the traverse motion. The distance to the is kept constant.

Next, the operation of the apparatus configured as described above will be described.
When the spinning machine is operated, the fiber bundle F is drafted by the draft device 12 and then guided from the final delivery roller pair 13 to the fiber bundle converging device 11. The bottom nip roller 181 and the top nip roller 19 are rotated at a speed substantially equal to the surface speed of the final delivery roller pair 13. The fiber bundle F moves to the downstream side while being twisted after passing the nip point between the rollers 181 and 19 in an appropriate tension state.

  The suction action of the duct (not shown) is applied to the suction pipe 15 via the connection pipe 26, and the suction action of the suction slit 27 is applied to the fiber bundle F via the ventilation conveyance belt 16. The fiber bundle F moves while being sucked and focused at a position corresponding to the suction slit 27. In this case, the air in the vicinity of the suction slit 27 and in the vicinity of the surface of the ventilation conveyance belt 16 sequentially flows into the suction slit 27. However, the side wall 31 blocks airflow from the outside of the side edge 30 to the suction slit 27, and the covering wall 32 blocks airflow from above the suction slit 27 to the suction slit 27. Therefore, the airflow toward the suction slit 27 in the width direction H of the suction slit 27 is mainly an airflow flowing from the airflow introduction gap S between the front end edge 321 of the covering wall 32 and the surface of the ventilation conveyance belt 16 to the suction slit 27. . As a result, the fiber bundle F sucked to the position corresponding to the suction slit 27 is transported by the ventilation transport belt 16 and the air flow introduction gap S mainly between the leading edge 321 of the covering wall 32 and the surface of the ventilation transport belt 16. And the action of the airflow flowing from the suction slit 27 to the suction slit 27.

  FIG. 3A shows the relationship between the hairline obtained by the test and the movement position of the fiber bundle F. FIG. FIG. 3B is a graph showing the relationship between the yarn strength obtained by the test and the movement position of the fiber bundle F. Hairiness is an evaluation item relating to fluff, and is defined as the total length of protruding fibers (fluff) per 1 cm length of yarn. 3 (a) and 3 (b), the position X on the horizontal axis indicating the movement position of the fiber bundle F represents the position X shown in FIG. 2 (a), and the position Z on the horizontal axis is shown in FIG. 2 (a). The position Z shown is represented. The position Y on the horizontal axis represents the position Y shown in FIG.

  Symbols □ in FIGS. 3A and 3B represent test results when the cover 33 is present, and symbols ◇ in FIGS. 3A and 3B represent test results when the cover 33 is not present. In the hairlineness of FIG. 3 (a), the characteristic is improved as it goes downward on the vertical axis, and in the yarn strength of FIG. 3 (b), the characteristic is improved as it goes upward on the vertical axis.

  The test result of FIG. 3A shows that the hairlineness is better when the cover 33 is present than when the cover 33 is not present. The improvement of hairlineness when the fiber bundle F is at the movement position Z is particularly remarkable. Further, when the cover 33 is present, the difference in hairlines at the positions X to Z is reduced as compared with the case without the cover 33, and it can be seen that the hairlines are stable regardless of the traverse position.

  The test result in FIG. 3B shows that the yarn strength is better when the cover 33 is present than when the cover 33 is not present. The yarn strength is remarkably improved when the fiber bundle F is in any of the movement positions X and Z. Furthermore, when the cover 33 is present, the difference in yarn strength at the positions X to Z is reduced as compared with the case without the cover 33, and it can be seen that the yarn strength is stable regardless of the traverse position.

In the first embodiment, the following effects can be obtained.
(1) Airflow from the side edge 30 opposite to the guide edge 29 (outside of the side edge 30) to the suction slit 27 is blocked by the side wall 31. The airflow flowing to the suction slit 27 through the air increases compared to the case without the side wall 31. Therefore, the airflow from the outer side of the guide edge 29 to the suction slit 27 is increased, and the convergence of the fiber bundle F is improved.

  (2) The airflow from the upper side of the suction slit 27 to the suction slit 27 is blocked by the covering wall 32, so that the airflow flowing from the outer side of the guide edge 29 to the suction slit 27 through the airflow introduction gap does not have the covering wall 32. Increase compared to the case. That is, the covering wall 32 contributes to improvement of the convergence property of the fiber bundle F.

(3) In order to improve the convergence of the fiber bundle F, it is desirable that the airflow flowing from the outer side of the guide edge 29 toward the suction slit 27 is directed to the suction slit 27 in a state parallel to the guide surface 28.
The leading edge 321 of the covering wall 32 having the inner surface 320 spaced apart from the guide surface 28 reaches a position beyond the guide edge 29 in the width direction H of the suction slit 27 (outside of the guide edge 29). ing. Therefore, the flow direction of the airflow flowing from the outer side of the guide edge 29 to the suction slit 27 via the airflow introduction gap S approaches a state parallel to the guide surface 28. Therefore, the configuration in which the covering wall 32 is extended to the place beyond the guide edge 29 in the width direction H of the suction slit 27 contributes to the improvement of the convergence of the fiber bundle F.

  (4) The overhanging portion 331 that protrudes toward the ventilation conveyance belt 16 on the outer side of the side edge 30 is formed on the outer side of the side edge 30 from the upstream end 271 side or the downstream end 272 side to the suction slit 27. Suppresses the inflow of airflow. Such suppression of the inflow of the airflow causes a further increase in the airflow from the outside of the guide edge 29 to the suction slit 27 and contributes to an improvement in the convergence of the fiber bundle F.

  (5) The side wall 31 is erected without generating a gap with the guide surface 28 of the suction pipe 15, and the covering wall 32 is connected with the side wall 31 without generating a gap. In such a configuration without a gap, there is no inflow of airflow between the base end of the side wall 31 and the guide surface 28 and no inflow of airflow between the front end of the side wall 31 and the base end of the covering wall 32, The airflow from the outer side of the guide edge 29 to the suction slit 27 is effectively increased.

(6) The configuration in which the cover 33 is integrally formed by the side wall 31 and the covering wall 32 facilitates formation of a desired shape of the cover 33.
Next, a second embodiment of FIG. 4 will be described. The same reference numerals are used for the same components as those in the first embodiment, and detailed description thereof is omitted.

As shown in FIG. 4, the cover 33 </ b> A of the second embodiment is different from the first embodiment only in that there is no overhanging portion 331 in the first embodiment.
In the second embodiment, the same effects as the items (1) to (3), (5), and (6) in the first embodiment can be obtained.

Next, a third embodiment of FIGS. 5 and 6 will be described. The same reference numerals are used for the same components as those in the second embodiment, and detailed description thereof is omitted.
As shown in FIGS. 5A and 5B, a hole 322 is formed in the covering wall 32 in the cover 33 </ b> B of the third embodiment. The hole 322 penetrates from the outside of the covering wall 32 to the inside of the covering wall 32 at a position near the upstream end 271 of the suction slit 27 and on the outer side of the side edge 30. The airflow that has flowed into the inside of the coating wall 32 from the outside of the coating wall 32 through the hole 322 is directed to the side edge 30 near the upstream end 271 of the suction slit 27 on the outside of the side edge 30. The airflow that has passed through the hole 322 moves the fiber bundle F in the vicinity of the movement position X toward the guide edge 29.

  FIG. 6A shows the relationship between the hair lineness obtained by the spinning test and the movement position of the fiber bundle F. FIG. FIG. 6B is a graph showing the relationship between the yarn strength obtained by the spinning test and the movement position of the fiber bundle F. Symbols ◯ in FIGS. 6A and 6B indicate test results when the cover 33B is present, and symbols □ in FIGS. 6A and 6B indicate when the cover 33 of the first embodiment is present. Represents the test results.

  The test result in FIG. 6A shows that there is no significant change in the hairlines between the cover 33B and the cover 33 at the movement positions Y and Z, but the hairlineness at the movement position X is greater for the cover 33B than for the cover 33. Show good. Therefore, when the cover 33B is present, the difference in hairlines at the positions X to Z is further reduced as compared with the case where the cover 33 is present, and the hairlines are compared with the first embodiment regardless of the traverse position. It turns out that it is more stable. The test result in FIG. 6B shows that there is no significant change in the yarn strength between the cover 33B and the cover 33 at the movement positions Y and Z, but the yarn strength at the movement position X is greater in the cover 33B than in the cover 33B. It shows a good comparison. Accordingly, when the cover 33B is present, the difference in yarn strength at the positions X to Z is further reduced as compared with the case where the cover 33 is present, and the yarn strength is compared with that of the first embodiment regardless of the traverse position. It can be seen that it is more stable.

In the third embodiment, an effect equal to or greater than that of the second embodiment can be obtained.
In the present invention, the following embodiments are also possible.
As shown in FIGS. 7A and 7B, a hole 332 may be provided in the protruding portion 331 of the cover 33. The hole 332 is directed toward the upstream edge 271 of the suction slit 27 and toward the side edge 30, and the airflow passing through the hole 332 moves the fiber bundle F in the vicinity of the movement position X toward the guide edge 29.

In this embodiment, the same effect as in the third embodiment can be obtained.
As shown in FIG. 8, a cover 33C composed of an inclined side wall 31C and an inclined covering wall 32C may be used. The covering wall 32 </ b> C reaches the outer side of the guide edge 29 in the width direction H of the suction slit 27.

  As shown in FIG. 9, an inclined wall-shaped cover 33D may be used. The front end of the cover 33 </ b> D reaches the outer side of the guide edge 29 in the width direction H of the suction slit 27. The cover 33C serves as an inclined side wall and an inclined covering wall.

In the first embodiment, the guide surface 28 may be a flat surface, and the inner surface 320 of the covering wall 32 may be a flat surface.
In the first embodiment, the covering wall 32 of the cover 33 may cover the entire suction slit 27.

In the first embodiment, the overhang portion 331 may be separated from the side wall 31.
The guide surface 28 and the inner surface 320 of the covering wall 32 may have different surface shapes. For example, the guide surface 28 may be a curved surface and the inner surface 320 may be a flat surface.

  The inclination direction of the suction slit 27 with respect to the conveyance direction of the ventilation conveyance belt 16 may be opposite to that in the first embodiment (the shape in which the suction slit 27 shown in FIG. 2A is reversed left and right).

A ventilating and conveying belt formed by opening a large number of holes in a rubber or elastic resin belt may be used.
The technical idea that can be grasped from the above-described embodiment will be described below.

  (B) The length of the covering wall in the width direction of the suction slit is the length of the upstream end side of the suction slit is longer than the downstream end side of the suction slit. Fiber bundle concentrator in spinning machine.

  (B) The side wall is erected on the suction pipe without generating a gap with the suction pipe, and the covering wall is connected to the side wall without generating a gap with the side wall. The fiber bundle focusing device in the spinning machine according to claim 4.

  11: Fiber bundle focusing device. 12 ... Draft device. 13: Final delivery roller pair. 15 ... Suction pipe. 16: Ventilation conveyance belt. 27: Suction slit. 271: Upstream end. 272: downstream end. 28 ... Guide surface. 29 ... Guide edge. 30 ... side edge. 31, 31C ... sidewalls. 32, 32C ... covering wall. 322 ... hole. 33, 33A, 33B, 33C, 33D ... cover. 331 ... Overhang part. F ... Fiber bundle. S: Airflow introduction gap. H: width direction.

Claims (5)

A suction pipe provided with a suction slit provided on the downstream side of the final delivery roller pair of the draft device, and a ventilation conveyance belt that is moved while being wound around the guide surface of the suction pipe so as to cover the suction slit In a fiber bundle concentrating device in a spinning machine in which one side edge of a pair of side edges in the width direction of the suction slit is formed as a guide edge for converging the fiber bundle,
A fiber in a spinning machine in which a cover that covers the upper side of the suction slit and the outer side of the side edge opposite to the guide edge is provided, and an air flow introduction gap is provided between the guide edge and the cover. Bundle focusing device.   2. The fiber bundle focusing in a spinning machine according to claim 1, wherein the cover includes a covering wall that covers an upper portion of the suction slit, and a leading edge on the guide edge side of the covering wall reaches an outer side of the guide edge. apparatus.   3. The fiber bundle concentrating device in a spinning machine according to claim 2, wherein the covering wall includes an overhanging portion that protrudes toward the ventilating and conveying belt on an outer side of the opposite side edge.   The said cover is provided with the side wall which coat | covers the outer side of the said side wall of the said coating wall and the said opposite side, The said coating wall and the said side wall are integrally formed. The fiber bundle concentrating device in the spinning machine according to the item.   The said cover has a hole penetrating from the outside to the inside of the cover, and the hole is provided near the upstream end of the suction slit and on the outer side of the opposite side edge. The fiber bundle focusing device in the spinning machine according to claim 4.

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