JP2010037677A - Fiber bundle collecting device for spinning machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fiber bundle collecting device for a spinning machine which reduces the variation of the spun yarn quality. <P>SOLUTION: The fiber bundle collecting device, which is provided on the downstream of a final delivery roller pair of a draft device, includes: a suction pipe 15 with a suction slit 27; and a ventilating conveyor belt 16 wound around a guide portion and rotated to deliver fiber bundle F. The suction slit 27 is formed oblique with respect to the traveling direction of which the fiber bundle F travels in the regions upstream and downstream of the suction slit 27, the outer side of the oblique direction of the suction slit has a side edge serving as a guide edge 29 for collecting the fiber bundle F, and the guide edge 29 is formed such that the obliqueness of an upstream portion 29a is larger than that of a downstream portion 29b. A side edge 30 formed opposite to the guide edge 29 is formed such that its downstream portion 30a extends along the guide edge 29 from the downstream end, and the side edge is formed such that the upstream end is located at a side of the guide edge 29 as viewed from the intersection point P1 located between the imaginary line L1 as an extension from a downstream portion 30a of the side edge and the imaginary line L2 extending along an upstream end edge 32. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fiber bundle concentrating device in a spinning machine, and more particularly to a fiber bundle concentrating device for a spinning machine that is arranged downstream of a draft device (draft part) of a spinning machine and converges the fiber bundle drafted by the draft device.

  Various fiber bundle converging devices have been proposed and implemented for the purpose of improving the yarn quality such as reducing the fluff by converging the drafted fiber bundle (sliver) in advance before twisting. The fiber bundle converging / transporting structure, which is a basic function, includes a suction pipe having a guide surface with a suction slit, and a breathable (porous) transport belt that moves along the guide surface. (For example, refer to Patent Document 1).

  As shown in FIG. 6, the fiber bundle concentrating device disclosed in Patent Document 1 has a suction pipe 63 and its suction pipe 63 downstream of the draft roller 61 in the fiber bundle transfer direction of the front roller pair (final roller pair) 62. A porous conveyor belt 65 wound around a guide roller 64 is provided. A suction slit 66 is provided on the sliding surface of the suction pipe 63. In the vicinity of the downstream end of the suction slit 66 in the moving direction of the fiber bundle F, a fastening roller 67 that moves the transport belt 65 while pressing the fiber bundle F and the transport belt 65 to the suction pipe 63 is provided.

As shown in FIG. 7A, the suction slit 66 is formed so as to be inclined with respect to the fiber bundle transfer direction (arrow direction) by the conveyor belt 65. More specifically, the suction slit 66 is formed so that its width is substantially constant except for the upstream end of the fiber bundle in the fiber bundle transfer direction, and the portion near the upstream end is formed in a shape that becomes wider toward the upstream side. Further, the suction slit 66 has a straight line on the left side in the width direction (longitudinal direction of the suction pipe 63), that is, the left edge in FIGS. 7A and 7B when viewed from the upstream side in the fiber bundle moving direction. The right edge is bent so that the angle formed with the fiber bundle transfer direction increases from the middle of the upstream side in the fiber bundle movement direction. That is, the suction slit 66 has a wide start region 68 at the upstream end. The right edge of the suction slit 66 constitutes the guide edge 69 of the fiber bundle F. In the spinning machine, the fiber bundle F travels while traversing in the width direction of the conveyor belt 65 in order to suppress uneven wear at the contact portion with the fiber bundle of the draft device. In the apparatus of Patent Document 1, the fiber bundle F is traversed in the range of the width W of the start region 68 formed at the upstream end of the suction slit 66. The traverse width is described as 5 to 6 mm.
JP 2002-61036 A

  In the configuration of Patent Document 1, the fiber bundle F is traversed within the width of the start region 68 formed at the upstream end of the suction slit 66, and the downstream end of the start region 68 following the guide edge 69 of the suction slit 66. The fiber bundle F is guided from the edge 68a to the guide edge 69. Therefore, it is described that the distance that the fiber bundle F that has advanced to the start region 68 moves along the guide edge 69 is constant regardless of the position of the fiber bundle F entering the start region 68 by the traverse motion. However, when trying to make all the downstream end edges 68a of the start area 68 correspond to the traverse range, the angle formed between the downstream end edge 68a of the start area 68 and the fiber bundle transfer direction of the transport belt 65 is increased. Inevitably, the fiber bundle F does not follow the line of the downstream end edge 68a, and the fiber bundle F is not smoothly guided to the guide edge 69, which causes variations in yarn quality.

  For this reason, as shown in FIG. 7C, the angle formed by the downstream end edge 68a of the start region 68 and the fiber bundle transfer direction of the conveyor belt 65 cannot be so large, and the range S of the traverse motion of the fiber bundle F is In addition, the position must be set at a position corresponding to both the downstream end edge 68 a of the start region 68 and the guide edge 69 of the suction slit 66. Therefore, when the traveling position of the fiber bundle F with respect to the suction slit 66 is changed by the traverse motion, the lengths of movement of the fiber bundle F along the guide edge 69 of the suction slit 66 become different. Specifically, the fiber bundle F traveling on the left side with respect to the suction slit 66 has a shorter moving distance along the guide edge 69 serving as a portion that contributes to focusing than the fiber bundle F traveling on the right side. .

  In order to solve this, if the angle of the suction slit 66 with respect to the fiber bundle transfer direction is increased, the fiber bundle F becomes difficult to follow the guide edge 69 of the suction slit 66. Further, it is difficult in view of the layout of the spinning machine to lengthen the entire length of the suction slit 66 and reduce the variation. Further, if only the angle of the side edge of the suction slit 66 opposite to the guide edge 69 is increased, there is a problem because a portion where the width of the suction slit 66 becomes narrow occurs.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a fiber bundle concentrating device in a spinning machine that can reduce variations in the quality of spun yarn.

  In order to achieve the above object, the invention according to claim 1 is a suction pipe provided on the downstream side of the final delivery roller pair of the draft device and having a guide surface having a suction slit, and the suction pipe and the guide portion. 1 is a fiber bundle concentrating device in a spinning machine that includes a ventilation conveyance belt that is rotated while being wound around a fiber bundle and conveys a fiber bundle. And the said suction slit is formed in the state inclined with respect to the running direction of the said fiber bundle in the upstream and downstream from the said suction slit, and one side edge of the both-sides edges in the width direction of the said suction slit Constitutes a guide edge for converging the fiber bundle, and the guide edge is formed such that the inclination of the upstream part is larger than the inclination of the downstream part. The side edge opposite to the guide edge is formed such that the downstream portion extends from the downstream end along the guide edge, and the upstream end is an imaginary line extending the downstream portion of the side edge opposite to the guide edge. Is shifted to the guide edge side from a position intersecting an imaginary line extending along an upstream end edge perpendicular to the traveling direction of the fiber bundle of the suction slit.

  Here, “the imaginary line extending the downstream part of the side edge opposite to the guide edge” means the imaginary line extending in the direction of the straight line when the downstream part of the side edge opposite to the guide edge is linear. When the downstream part of the side edge opposite to the guide edge is curved, the tangent at the upper end of the downstream part of the side edge means a virtual line.

  In the present invention, the guide edge of the suction slit has an inclination of the upstream portion larger than that of the downstream portion, the side edge opposite to the guide edge extends downstream from the downstream end along the guide edge, and the upstream end is the guide edge. An imaginary line extending from the downstream portion of the side edge opposite to the edge is shifted to the guide edge side from a position intersecting with an imaginary line extending along the upstream end edge perpendicular to the traveling direction of the fiber bundle of the suction slit. Therefore, even if the fiber bundle enters in a state of entering from the side farther from the guide edge than the side edge opposite to the guide edge with respect to the suction slit, the distance moved along the guide edge of the suction slit is higher than the upstream end. The imaginary line obtained by extending the downstream portion of the side edge is longer than the case where the imaginary line is set at a position intersecting with the imaginary line extending along the upstream end edge perpendicular to the traveling direction of the fiber bundle of the suction slit. Therefore, when the traveling positions of the fiber bundles are different, the difference in the distance of movement along the guide edge is reduced, and variations in the spun yarn quality can be reduced.

  According to a second aspect of the present invention, in the first aspect of the invention, the upstream portion of the side edge opposite to the guide edge has a straight portion on the upstream end side along the fiber bundle pull-out direction. The downstream part of the side edge on the side and the straight part are connected by a straight line or a curve. In this invention, since the straight portion along the fiber bundle pull-out direction is formed on the upstream end side of the side edge opposite to the guide edge, the fiber bundle is guided to the suction slit from the side opposite to the guide edge from the upstream end. In this case, the fiber bundle travel position shifts in the direction opposite to the guide edge from the upstream end position due to the suction force of the suction slit downstream of the upstream end. As a result, the fiber bundle moves along the guide edge of the suction slit. It is possible to suppress the movement distance from being shortened. Therefore, it is possible to more reliably reduce the variation in the spun yarn quality.

  According to a third aspect of the present invention, in the first aspect of the present invention, the upstream portion of the side edge opposite to the guide edge is formed by a single straight line or curve continuous to the downstream portion. In the present invention, the shape of the side edge opposite to the guide edge of the suction slit is simpler than that of the invention described in claim 2.

  ADVANTAGE OF THE INVENTION According to this invention, the fiber bundle focusing apparatus in the spinning machine which can reduce the dispersion | variation in spun yarn quality can be provided.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment in which the present invention is embodied in a fiber bundle concentrating device installed in a spinning machine will be described with reference to FIGS.
As shown in FIG. 1, the fiber bundle focusing 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 delivery unit 14 is pressed via a ventilation conveyance belt 16 to a bottom nip roller 18a as a nip roller formed on a rotary shaft 18 disposed in parallel with the front bottom roller 13a of the final delivery roller pair 13 and the bottom nip roller 18a. And a top nip roller 19. Similarly to the front top roller 13b of the draft device 12, the top nip roller 19 is supported by a weighting arm (not shown) via a support member 20 every two spindles. The support member 20 is formed integrally with the support member of the front top roller 13b. 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.

  On the other hand, the bottom side of the fiber bundle concentrating device 11 is configured as a unit of half of the weights arranged between the roller stands 21 of the draft device 12, that is, four weights in this embodiment. A support arm (none of which is shown) is provided at an intermediate position of the roller stand 21 arranged at a predetermined interval in the machine table longitudinal direction with the base end side supported by a support beam extending in the machine table longitudinal direction. The rotating shaft 18 is supported between the roller stand 21 and the support arm. The rotary shaft 18 is provided with a gear 22 at an intermediate portion in the longitudinal direction so as to be integrally rotatable with the rotary shaft 18.

  A gear portion 13 c is formed on the front bottom roller 13 a at a position facing the gear 22. The intermediate gear 25 is rotatably supported by a support arm 24 whose base end is fixed to the support beam, and the intermediate gear 25 meshes with the gear portion 13 c and the gear 22. That is, the rotational force of the front bottom roller 13a is transmitted to the rotary shaft 18 through the gear portion 13c, the intermediate gear 25, and the gear 22.

  The spinning machine base is provided with a suction duct (not shown) so as to extend in the longitudinal direction (perpendicular to the paper surface of FIG. 1). The suction pipe 15 extends in parallel with the suction duct and is connected to the suction duct via the connection pipe 26. The suction pipe 15 has a guide surface 28 provided with a suction slit 27. The ventilation conveyance belt 16 is rotated while being partially wound around the suction pipe 15, partially on the guide portion 17, and partially on the bottom nip roller 18 a, and conveys the fiber bundle F. The ventilation conveyance belt 16 is formed of a woven fabric that can ensure appropriate ventilation.

  2 (a) and 2 (b), the suction slit 27 is in the traveling direction of the fiber bundle F on the upstream side and the downstream side of the suction slit 27 (the vertical direction in FIGS. 2 (a) and 2 (b)). It is formed in an inclined state. In this embodiment, the suction slit 27 is formed so as to be inclined to the right when viewed from the upstream side in the fiber bundle moving direction. The suction slit 27 converges the fiber bundle F on the side edge on the outer side in the inclined direction (the right side in FIGS. 2A and 2B) among both side edges in the width direction of the suction slit 27 (longitudinal direction of the suction pipe 15). A guide edge 29 is formed. The guide edge 29 is formed so that the upstream portion 29a and the downstream portion 29b extending linearly are continuous, and the inclination of the upstream portion 29a is larger than the inclination of the downstream portion 29b. In addition, the connection part of the upstream part 29a and the downstream part 29b is smoothly connected with the curve.

  The side edge 30 opposite to the guide edge 29 is formed such that the downstream portion 30 a extends from the downstream end along the downstream portion 29 b of the guide edge 29. In this embodiment, the downstream portion 30 a is formed in parallel with the downstream portion 29 b of the guide edge 29. The upstream end 30up of the side edge 30 is shifted to the guide edge 29 side from the position P1 where the virtual line L1 extending the downstream portion 30a of the side edge 30 intersects the virtual line L2 extending along the upstream end edge 32 of the suction slit 27. ing. The upstream edge 32 of the suction slit 27 is orthogonal to the traveling direction of the fiber bundle F, and the distance from the nip point of the final delivery roller pair 13 to the suction slit 27 even if the position of the fiber bundle F changes due to traversing motion. Is kept constant.

  The upstream portion 30b of the side edge 30 has a straight portion 31 along the fiber bundle pulling direction on the upstream end side, and the intermediate portion 30c that connects the downstream portion 30a and the straight portion 31 of the side edge 30 is more than the downstream portion 30a. It is formed by a straight line formed so as to increase the inclination. The straight line portion 31 is formed at a position where the virtual extension line intersects the upstream portion 29 a of the guide edge 29. That is, the upstream end 30up of the side edge 30 is provided at a position where an imaginary line passing through the upstream end 30up and extending in the traveling direction of the fiber bundle F intersects the upstream portion 29a of the guide edge 29. The straight line of the intermediate part 30c is formed with the same inclination as the upstream part 29a of the guide edge 29, and the end part of the intermediate part 30c is smoothly connected to the downstream part 30a with a curve.

  The ratio of the length of the upstream portion 29a and the downstream portion 29b of the guide edge 29 of the suction slit 27, the ratio of the length of the downstream portion 30a and the upstream portion 30b of the side edge 30, or the length of the straight portion 31 relative to the entire side edge 30 The ratio of the height is appropriately set depending on the relationship with the inclination of the guide edge 29 or the required quality for the yarn to be spun.

The range of the traverse movement of the fiber bundle F is set so as to include an imaginary line (not shown) that extends in the traveling direction of the fiber bundle F through the upstream end 30up of the side edge 30.
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 18a and the top nip roller 19 are rotated at a speed substantially equal to the surface speed of the final delivery roller pair 13, and the fiber bundle F is turned after passing the nip point between the rollers 18a and 19 in an appropriate tension state. It moves downstream while being twisted. Further, the fiber bundle F moves while performing a traverse motion by the action of a traverse device (not shown). The speed of the traverse motion is set to a sufficiently smaller speed than the traveling speed of the fiber bundle F.

  Further, the suction action of the duct extends to the suction pipe 15 via the connection pipe 26, and the suction action of the suction slit 27 formed on the guide surface 28 reaches the fiber bundle F via the ventilation conveyance belt 16. Then, the fiber bundle F moves in a state where the fiber bundle F is sucked and focused at a position corresponding to the suction slit 27. Therefore, as compared with a spinning machine not equipped with the fiber bundle concentrating device 11, the generation of fluff and cotton fall are suppressed and the yarn quality is improved.

  The fiber bundle F delivered from the final delivery roller pair 13 receives a force in a direction (a width direction of the suction slit 27) perpendicular to the conveyance direction of the ventilation conveyance belt 16 by the traverse motion. At the position where the fiber bundle F corresponds to the suction slit 27, the fiber bundle F is pressed against the surface of the ventilating and conveying belt 16 by the suction action of the suction slit 27, so that the fiber bundle F hardly moves in the width direction of the suction slit 27. Become.

  In the present embodiment, the side edge 30 of the suction slit 27 is not straight, and an imaginary line L1 in which the upstream end 30up of the side edge 30 extends the downstream portion 30a of the side edge 30 as shown in FIG. The suction slit 27 is shifted to the guide edge 29 side from the position P1 intersecting the imaginary line L2 extending along the upstream end edge 32 orthogonal to the traveling direction of the fiber bundle, and has the straight portion 31 on the upstream end side. . Therefore, the fiber bundle F traveling on the left side in the drawing with respect to the upstream end 30up of the side edge 30 can be focused at a sufficient length in the downstream portion 29b of the guide edge 29.

  Therefore, the region where the fiber bundle F is converged in a state along the guide edge 29 is a range upstream of the downstream portion 29b from the lower end of the guide edge 29 regardless of the traversing position. As a result, the range in which the fiber bundle F is pressed and focused on the guide edge 29 does not vary greatly depending on the traversing position, and variations in the quality of the spun yarn are reduced.

When the suction pipe 15 in which the suction slit 27 having the shape shown in FIG. 2B is formed is used, and the suction pipe 15 in which the suction slit 27 having the shape shown in FIG. 7C is used as a comparative example. In some cases, spinning was performed without traversing the fiber bundle F. Then, the hairlineness and yarn strength of the spun yarn obtained in each case where the traveling position of the fiber bundle F was changed were measured. The results are shown in FIGS. 3 (a) and (b). A test was conducted on 100% cotton spun yarn having a thickness of 50. Hairliness is an evaluation item related to fluff and is defined as follows. Hairlineness: Total length of protruding fiber with respect to 1 cm yarn FIG. 3A shows the relationship between the hairlineness and the travel position of the fiber bundle F, and FIG. 3B shows the relationship between the yarn strength and the travel position of the fiber bundle F. It is a graph which shows a relationship. 3A and 3B, the value “0” on the horizontal axis indicating the travel position indicates a position where the fiber bundle F enters the upstream end of the suction slit 27 corresponding to the downstream end 29dp of the guide edge 29. “2” represents a position shifted 2 mm to the right from the position “0”, and “−2” represents a position shifted 2 mm to the left from the position “0”. In addition, the hairlineness in FIG. 3A represents that the characteristic is improved as it goes down on the vertical axis, and the yarn strength in FIG. 3B is that the characteristic is improved as it goes up on the vertical axis. To express. From FIG. 3 (a), it can be confirmed that the variation of the hairline due to the difference in the running position is small in the case of the embodiment (invention) compared to the case of the comparative example (conventional product), and the evaluation of the hairlines is also improved. It can be confirmed. Further, from FIG. 3B, it can be confirmed that the variation in the yarn strength due to the difference in the traveling position is smaller in the example (invention product) than in the comparative example (conventional product), and the yarn strength is evaluated. Can also be confirmed.

According to this embodiment, the following effects can be obtained.
(1) The fiber bundle concentrating device 11 is provided on the downstream side of the final delivery roller pair 13 of the draft device 12, and is wound around the suction pipe 15 having the guide surface 28 provided with the suction slit 27, and the suction pipe 15 and the guide portion 17. A ventilation conveyance belt 16 that is rotated in a hung state and conveys the fiber bundle F is provided. The suction slit 27 is formed so as to be inclined with respect to the traveling direction of the fiber bundle F on the upstream side and the downstream side of the suction slit 27, and the side edges on the outer side in the inclination direction among the both side edges in the width direction of the suction slit 27. A guide edge 29 for converging the fiber bundle F is formed, and the guide edge 29 is formed so that the inclination of the upstream portion 29a is larger than the inclination of the downstream portion 29b. The side edge 30 opposite to the guide edge 29 is formed such that the downstream portion 30a extends from the downstream end along the guide edge 29, and the upstream end is sucked by the virtual line L1 extending from the downstream portion 30a of the side edge 30 The slit 27 is shifted to the guide edge 29 side from a position intersecting an imaginary line L2 extending along the upstream end edge orthogonal to the traveling direction of the fiber bundle. Therefore, even when the fiber bundle F travels on a route far from the guide edge 29, a sufficient distance for the fiber bundle F to move along the guide edge 29 of the suction slit 27 is secured. As a result, when the traveling position of the fiber bundle F is different due to the traversing motion, the difference in the distance of movement along the guide edge 29 is reduced, and variations in the spun yarn quality can be reduced.

  (2) In the suction slit 27, the upstream portion 30b of the side edge 30 opposite to the guide edge 29 has a straight portion 31 along the fiber bundle drawing direction on the upstream end side, and the downstream portion of the opposite side edge 30 The intermediate portion 30c that connects 30a and the straight portion 31 is formed by a straight line formed so that the inclination is larger than that of the downstream portion 30a. Accordingly, when the fiber bundle F is guided to the suction slit 27 from the side opposite to the guide edge 29 with respect to the upstream end 30up, the traveling position of the fiber bundle F is determined by the suction force of the suction slit 27 downstream of the upstream end 30up. It is suppressed that the distance that the fiber bundle F moves along the guide edge 29 of the suction slit 27 is shortened as a result of being shifted in the opposite direction to the guide edge 29 from the position of the upstream end 30up. Therefore, it is possible to more reliably reduce the variation in the spun yarn quality.

  (3) The straight line portion 31 is provided at a position where an imaginary line extending from the lower end to the downstream side intersects with the upstream portion 29 a of the guide edge 29. Therefore, the range in which the fiber bundle F is pressed and converged by the guide edge 29 becomes longer, and the quality of the strongly spun yarn is improved.

The embodiment is not limited to the above, and may be embodied as follows, for example.
The shape of the suction slit 27 is such that the upstream portion 30b of the side edge 30 opposite to the guide edge 29 has a straight portion 31 along the fiber bundle pulling direction on the upstream end side, and is straight with the downstream portion 30a of the side edge 30 The part 31 is not limited to being connected by the intermediate part 30c. For example, as shown in FIG. 4 (a), the upstream portion 30b does not have the straight portion 31 along the fiber bundle drawing direction, and the angle formed with the fiber bundle drawing direction is larger than the angle formed with the downstream portion 30a. It is good also as a shape extended continuously in the downstream part 30a. In this case, the shape of the side edge 30 on the opposite side of the guide edge 29 of the suction slit 27 is simpler than that in the case of having the intermediate portion 30c.

  ○ The suction slit 27 is not limited to the arrangement in which the entire suction slit 27 is inclined to the right side when viewed from the upstream side in the fiber bundle moving direction, but is, for example, an arrangement inclined to the left side as shown in FIG. There may be. In this case, the left side edge in the width direction of the suction slit 27 becomes the guide edge 29. However, when the traveling position of the fiber bundle F is different, the distance moved along the guide edge 29 is the same, and the spun yarn Variations in quality can be reduced.

  The suction slit 27 is not limited to a shape in which the downstream portion 30 a of the side edge 30 extends in a straight line that is strictly parallel to the guide edge 29. For example, the distance between the downstream portion 30a of the side edge 30 and the guide edge 29 increases slightly toward the upstream side, or the downstream portion 30a of the side edge 30 and the downstream portion 29b of the guide edge 29 are not linear but continuous from the downstream end. Alternatively, the shape may be configured by a curved curve.

The suction slit 27 may be formed with a curved portion at both the upstream portion 29a and the downstream portion 29b of the guide edge 29.
As a configuration for rotating the ventilation conveyance belt 16 that conveys the fiber bundle F, as shown in FIG. 5, a guide member having an arcuate guide surface 33 a on the downstream side of the bottom nip roller 18 a may be provided as the guide portion 33. . Further, the connection pipe 26 that connects the suction pipe 15 and the suction duct and applies a negative pressure to the suction pipe 15 may be disposed at a position where the suction pipe 15 is connected from the front side of the bottom nip roller 18a.

O Instead of forming the ventilation conveyance belt 16 with woven fabric or knitted fabric, a plurality of holes may be formed in a rubber or elastic resin belt.
The following technical idea (invention) can be understood from the embodiment.

  (1) In the invention according to any one of claims 1 to 3, the phantom line extending the downstream portion of the side edge opposite to the guide edge of the suction slit is the width of the upstream end of the suction slit. The position intersecting the imaginary line extending in the direction is set closer to the upper end of the upstream portion of the guide edge than the upper end of the downstream portion of the guide edge.

The partially broken schematic side view of the fiber bundle focusing apparatus of one Embodiment. (A) is the partial schematic diagram which shows the relationship between the suction pipe and conveyance belt of a fiber bundle focusing apparatus, (b) is a schematic diagram which shows the relationship between a suction slit and a fiber bundle. (A) is a graph which shows the relationship between the travel position of a fiber bundle, and hairlineness, (b) is a graph which shows the relationship between the travel position of a fiber bundle, and yarn strength. (A), (b) is a schematic diagram which shows the shape of the suction slit in another embodiment, respectively. The partially broken schematic side view of the fiber bundle focusing apparatus of another embodiment. The partially broken schematic side view of the fiber bundle focusing apparatus of a prior art. (A) is a partial schematic diagram showing the relationship between the suction pipe and the conveyor belt, (b) is a schematic diagram showing the relationship between the suction slit and the fiber bundle, and (c) is a suction when the traversing range of the fiber bundle is changed. The schematic diagram which shows the relationship between a slit and a fiber bundle.

Explanation of symbols

  F ... fiber bundle, L1, L2 ... virtual line, P1 ... position, W1, W2 ... width, 11 ... fiber bundle focusing device, 12 ... draft device, 13 ... final delivery roller pair, 15 ... suction pipe, 16 ... ventilation conveyance Belt, 17, 33 ... guide portion, 27 ... suction slit, 28 ... guide surface, 29 ... guide edge, 29a, 30b ... upstream portion, 29b, 30a ... downstream portion, 29dp ... downstream end, 30 ... side edge, 30up ... Upstream end, 31 ... straight portion, 32 ... upstream end edge.

Claims (3)

A suction pipe provided on the downstream side of the final delivery roller pair of the draft device and having a guide surface provided with a suction slit, and an aerial conveyance that conveys the fiber bundle by being rotated around the suction pipe and the guide portion. A fiber bundle focusing device in a spinning machine equipped with a belt,
The suction slit is formed in a state inclined with respect to the traveling direction of the fiber bundle on the upstream side and the downstream side of the suction slit, and one side edge of both side edges in the width direction of the suction slit is the side A guide edge for converging the fiber bundle is formed, and the guide edge is formed such that the inclination of the upstream portion is larger than the inclination of the downstream portion, and the side edge opposite to the guide edge is the downstream portion from the downstream end. An imaginary line extending from the downstream portion of the side edge opposite to the guide edge is formed at an upstream end edge perpendicular to the traveling direction of the fiber bundle of the suction slit. A fiber bundle concentrating device in a spinning machine, wherein the fiber bundle converging device is shifted to the guide edge side from a position intersecting with an imaginary line extending along the line.   The upstream portion of the side edge opposite to the guide edge has a straight portion along the fiber bundle pulling direction on the upstream end side, and the downstream portion of the opposite side edge and the straight portion are connected by a straight line or a curve. The fiber bundle concentrating device in the spinning machine according to claim 1.   2. The fiber bundle concentrating device in a spinning machine according to claim 1, wherein an upstream part of a side edge opposite to the guide edge is formed by a single straight line or a curve continuous to the downstream part.

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