JP2021110062A - Draft device, spinning machine, spinning method, and draft roller - Google Patents

Abstract

To provide a draft device, a spinning machine, a spinning method, and a draft roller that enable stable spinning of a yarn thickness of which varies periodically.SOLUTION: A draft device 3 comprises: a pair of front rollers 10; a pair of middle rollers 20; a pair of third rollers 30; a first apron belt 25 that is hung on an outer peripheral surface of a roller body included in a middle bottom roller 21 of the pair of middle rollers 20; and a second apron belt 26 that is hung on an outer peripheral surface of a roller body included in a middle top roller 22 of the pair of middle rollers 20. A recess part 223 is formed on the outer peripheral surface of the middle top roller 22 such that the outer peripheral surface of the middle top roller 22 is continuous when viewed from an axial direction of the roller body 221.SELECTED DRAWING: Figure 2

Description

The present invention relates to a draft device, a spinning machine, a spinning method and a draft roller.

As a draft device for spinning a yarn whose thickness changes periodically, a device in which a notch is formed on a contact surface of a fiber bundle in a draft roller or an apron belt is known (for example, Patent Document 1, 2).

Jikkai Sho 63-050884 Gazette Japanese Unexamined Patent Publication No. 05-005229

In the draft device as described above, since sufficient pressure is not applied to the fiber bundle at the notch, the orientation of the fibers in the fiber bundle becomes unstable at the notch, and as a result, the thickness changes periodically. There is a risk that the yarn cannot be spun stably.

An object of the present invention is to provide a draft device, a spinning machine, a spinning method, and a draft roller that enable stable spinning of a yarn whose thickness changes periodically.

The draft device of the present invention is arranged on the most downstream side in the traveling direction of the fiber bundle, and has a first roller pair having a first driving roller and a first driven roller, and a first roller pair so as to be adjacent to the first roller pair. A second roller pair having a second driving roller and a second driven roller, which is arranged on the upstream side in the traveling direction with respect to the vehicle, and an upstream side in the traveling direction with respect to the second roller pair so as to be adjacent to the second roller pair. A third roller pair having a third drive roller and a third driven roller, a first apron belt hung on the outer peripheral surface of the roller body of the second drive roller, and a roller body of the second driven roller. A second apron belt hung on the outer peripheral surface of the roller is provided, and the outer peripheral surface of at least one of the second driving roller and the second driven roller is continuous when viewed from the axial direction of the roller body. A recess is formed in.

In this draft device, a recess is formed on the outer peripheral surface of the roller body on which the apron belt is hung. As a result, the pressure changes periodically while the state in which sufficient pressure is applied to the fiber bundle is maintained. Further, a recess is formed so that the outer peripheral surface is continuous when viewed from the axial direction of the roller body. As a result, the vibration generated in the roller body is suppressed. Therefore, according to this draft device, it is possible to generate a fiber bundle that enables stable spinning of a yarn whose thickness changes periodically.

In the draft device of the present invention, the recess may be formed on the outer peripheral surface of the second driving roller or the second driven roller. As a result, the cycle of change in pressure applied to the fiber bundle can be made constant without performing special control or the like, so that the fiber bundle that enables spinning of yarn whose thickness changes in a constant cycle can be obtained. Can be generated.

In the draft device of the present invention, the recess may be formed on the outer peripheral surface of the second driven roller. Thereby, for example, when the roller main body having the concave portion formed on the outer peripheral surface is replaced according to the type of yarn to be spun, the replacement work can be facilitated.

In the draft device of the present invention, the recess may be formed in the central region of the outer peripheral surface in the axial direction. As a result, it is possible to surely cause a change in pressure in the traveling fiber bundle.

In the draft device of the present invention, a plurality of recesses may be formed on the outer peripheral surface as recesses so as to be arranged along the circumferential direction of the roller body. As a result, the cycle of change in pressure applied to the fiber bundle can be shortened, so that it is possible to generate a fiber bundle capable of spinning a yarn whose thickness changes in a short cycle.

In the draft device of the present invention, the plurality of recesses have the same shape as each other, and may be formed on the outer peripheral surface so as to be arranged at equal intervals along the circumferential direction. As a result, the cycle of change in pressure applied to the fiber bundle can be shortened and made constant, so that it is possible to generate a fiber bundle capable of spinning a yarn having a short thickness and changing at a constant cycle.

In the draft device of the present invention, the recess may be formed on the outer peripheral surface so that the depth increases toward the central region of the recess along the circumferential direction of the roller body. As a result, the pressure applied to the fiber bundle can be gradually changed, such that the pressure applied to the fiber bundle gradually decreases and gradually increases, so that it is possible to spin a yarn having a gradual change in thickness. It is possible to generate a fiber bundle to be produced.

In the draft device of the present invention, the recess may be formed by a surface that is parallel to the tangent plane of the outer peripheral surface and intersects the outer peripheral surface. As a result, a recess whose depth increases toward the central region can be easily formed on the outer peripheral surface of the roller body.

In the draft device of the present invention, the roller body may be made of metal. As a result, the vibration generated in the roller body can be suppressed more reliably.

The spinning machine of the present invention winds up the above-mentioned draft device, an air spinning device that twists a fiber bundle drafted by the draft device by a swirling air flow to generate a yarn, and a yarn generated by the air spinning device. A winding device for forming a package is provided.

According to this spinning machine, it is possible to stably spin a yarn whose thickness changes periodically.

The spinning method of the present invention is a spinning method carried out by the above-mentioned spinning machine, and the speed of the fiber bundle delivered from the draft device is 300 m / min or more.

According to this spinning method, it is possible to stably spin a yarn whose thickness changes periodically.

In the spinning method of the present invention, the draft ratio of the second roller pair to the third roller pair is 1.1 to 3.0 times, and the draft ratio of the first roller pair to the second roller pair is 15 to 55 times. You may. As a result, the yarn whose thickness changes periodically can be spun more stably.

The draft roller of the present invention is a draft roller used in a draft device in a state where an apron belt is hung, and includes a roller body having an outer peripheral surface, and the outer peripheral surface is when viewed from the axial direction of the roller body. A recess is formed so that the outer peripheral surface is continuous.

According to this draft roller, it is possible to generate a fiber bundle that enables stable spinning of a yarn whose thickness changes periodically.

According to the present invention, it is possible to provide a draft device, a spinning machine, a spinning method and a draft roller that enable stable spinning of a yarn whose thickness changes periodically.

It is a side view of the spinning machine of one embodiment. It is a side view of a part of the draft apparatus shown in FIG. It is a perspective view of the middle top roller shown in FIG. It is a cross-sectional view of the middle top roller shown in FIG. It is a vertical sectional view of the middle top roller shown in FIG. It is a front view of the yarn spun by the spinning machine shown in FIG. It is a front view of the middle top roller of a modification. It is a front view of the middle top roller of a modification. It is a front view of the middle top roller of a modification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same or corresponding parts are designated by the same reference numerals, and duplicate description will be omitted.
[Spinning machine configuration]

As shown in FIG. 1, the spinning machine 1 includes a plurality of spinning units 2 and a plurality of unit controllers 100. The plurality of spinning units 2 are arranged in a row. Each spinning unit 2 drafts a sliver (fiber bundle) S to generate a fiber bundle F, twists the fiber bundle F by a swirling air flow to generate a yarn Y, and winds the yarn Y on a bobbin B. Form package P. Each unit controller 100 is provided for each of a predetermined number (one or a plurality of) spinning units 2 and controls the operation of each spinning unit 2. The spinning machine 1 is provided with a machine stand control device (not shown) which is a higher-level controller of the plurality of unit controllers 100.

Hereinafter, the upstream side in the traveling direction of the sliver S, the fiber bundle F, and the thread Y is referred to as an "upstream side", and the downstream side in the traveling direction is referred to as a "downstream side". Of the horizontal directions, one side (for example, the work passage side) in the direction perpendicular to the arrangement direction of the plurality of spinning units 2 is referred to as the "front side", and the other side in the direction is referred to as the "rear side". The upper side in the vertical direction is referred to as "upper side", and the lower side in the vertical direction is referred to as "lower side".

Each spinning unit 2 includes a draft device 3, an air spinning device 4, a thread monitoring device 5, a thread storage device 6, a thread splicing device 7, a winding device 8, a first capture guide device 9a, and a first. 2 The capture guide device 9b and the like are provided. The draft device 3, the air spinning device 4, the yarn monitoring device 5, the yarn storage device 6, the yarn splicing device 7, and the take-up device 8 are arranged in this order from the upstream side to the downstream side. As an example, the traveling directions of the sliver S, the fiber bundle F, and the yarn Y from the draft device 3 to the yarn storage device 6 are from the front side to the rear side, and are inclined upward with respect to the horizontal direction. The traveling direction of the yarn Y from the yarn storage device 6 to the take-up device 8 is a direction from the lower side to the upper side, and is inclined forward with respect to the vertical direction. In each spinning unit 2, the traveling direction of the yarn Y is switched in the yarn storage device 6.

The draft device 3 drafts the sliver S to generate the fiber bundle F. The draft device 3 has a front roller pair (first roller pair) 10, a middle roller pair (second roller pair) 20, a third roller pair (third roller pair) 30, and a back roller pair 40. ing. The front roller pair 10 is arranged on the most downstream side. The middle roller pair 20 is arranged on the upstream side with respect to the front roller pair 10 so as to be adjacent to the front roller pair 10. The third roller pair 30 is arranged on the upstream side with respect to the middle roller pair 20 so as to be adjacent to the middle roller pair 20. The back roller pair 40 is arranged on the upstream side with respect to the third roller pair 30 so as to be adjacent to the third roller pair 30.

The air spinning device 4 twists the fiber bundle F drafted by the draft device 3 by a swirling air flow to generate a yarn Y. By storing the yarn Y in the yarn storage roller, the yarn storage device 6 stably pulls out the yarn Y from the air spinning device 4 while absorbing the fluctuation of the tension generated in the yarn Y on the downstream side of the yarn storage device 6. .. The take-up device 8 winds the thread Y drawn by the thread storage device 6 on the bobbin B to form the package P. The take-up device 8 has a cradle arm 8a and a take-up drum 8b. The cradle arm 8a rotatably supports the bobbin B. The take-up drum 8b contacts the bobbin B or the package P to rotate the bobbin B or the package P. A twill swing groove (not shown) for twilling the yarn Y when winding the yarn Y is formed on the surface of the take-up drum 8b.

The thread monitoring device 5 monitors the information of the traveling thread Y and detects the presence or absence of a thread defect based on the monitored information. When the thread monitoring device 5 detects a thread defect, the thread monitoring device 5 transmits a thread defect detection signal to the unit controller 100. When the unit controller 100 receives the yarn defect detection signal, the unit controller 100 interrupts the generation of the fiber bundle F by the draft device 3 and the generation of the yarn Y by the air spinning device 4 in order to cut the yarn Y, and supplies the yarn Y. To interrupt. When the unit controller 100 receives the thread defect detection signal, it may operate, for example, a cutter (not shown) in order to cut the thread Y. In this case, the thread monitoring device 5 may have a cutter.

The yarn splicing device 7 performs yarn splicing to join the yarn Y from the air spinning device 4 and the yarn Y from the package P when the yarn Y is cut or the yarn Y is broken for some reason. The yarn splicing device 7 is a splicer device that twists yarn ends with each other by a swirling air flow. The first capture guide device 9a and the second capture guide device 9b are rotatable about the proximal end portion, respectively. The first capture guide device 9a captures the yarn Y from the air spinning apparatus 4 by the suction air flow by rotating downward before the yarn splicing is performed, and then rotates upward. , The yarn Y from the air spinning apparatus 4 is guided to the yarn splicing apparatus 7. The second capture guide device 9b captures the yarn Y from the package P by the suction air flow by rotating upward before the yarn splicing is performed, and then rotates downward to package the package. The thread Y from P is guided to the thread splicing device 7.
[Draft device configuration]

As shown in FIGS. 1 and 2, the front roller pair 10 has a front bottom roller (first driving roller) 11 and a front top roller (first driven roller) 12. The middle roller pair 20 has a middle bottom roller (second drive roller) 21 and a middle top roller (second driven roller, draft roller) 22. The third roller pair 30 has a third bottom roller (third drive roller) 31 and a third top roller (third driven roller) 32. The back roller pair 40 has a back bottom roller 41 and a back top roller 42.

A first ten server 23 is arranged between the front bottom roller 11 and the middle bottom roller 21. A first apron belt 25 is hung on the middle bottom roller 21 and the first ten server 23. A second ten server 24 is arranged between the front top roller 12 and the middle top roller 22. A second apron belt 26 is hung on the middle top roller 22 and the second ten server 24.

The bottom rollers 11, 21, 31, and 41 are rotated by separate drive motors (not shown) at different rotational speeds so as to be faster toward the downstream side. The top rollers 12, 22, 32, 42 and the second apron belt 26 are driven and rotated by the bottom rollers 11, 21, 31, 41 and the first apron belt 25.

As shown in FIGS. 3, 4 and 5, the middle top roller 22 has a roller body 221 and a roller end 222. The roller body 221 has a cylindrical shape having an outer peripheral surface 221a and an inner peripheral surface 221b. The roller end 222 has a cylindrical shape having an outer peripheral surface 222a and an inner peripheral surface 222b. The diameter of the outer peripheral surface 222a of the roller end portion 222 is smaller than the diameter of the outer peripheral surface 221a of the roller main body 221. The diameter of the inner peripheral surface 222b of the roller end portion 222 is equal to the diameter of the inner peripheral surface 221b of the roller main body 221. The roller body 221 and the roller end 222 are integrally formed of metal (for example, iron). The second apron belt 26 (see FIG. 2) is hung on the outer peripheral surface 221a of the roller main body 221.

A plurality of recesses 223 are formed on the outer peripheral surface 221a of the roller main body 221 so that the outer peripheral surface 221a is continuous when viewed from the axial direction D1 of the roller main body 221. The axial direction D1 is a direction parallel to the rotation center line of the roller body 221. The fact that the outer peripheral surface 221a is continuous when viewed from the axial direction D1 means that a circle (a circle having no chips, dents, etc.) is formed by the outer peripheral surface 221a when viewed from the axial direction D1 (FIG. 4). reference).

The plurality of recesses 223 are formed on the outer peripheral surface 221a so as to line up along the circumferential direction D2 of the roller main body 221. The circumferential direction D2 is the circumferential direction of the outer peripheral surface 221a which has a cylindrical surface shape. Each recess 223 is formed in the central region of the outer peripheral surface 221a in the axial direction D1. Each recess 223 is composed of a surface 223a. The surface 223a is a surface that is parallel to the tangent plane TP of the outer peripheral surface 221a and intersects the outer peripheral surface 221a. As a result, the depth of each recess 223 increases toward the central region of each recess 223 along the circumferential direction D2. The plurality of recesses 223 have the same shape as each other (for example, a rectangular shape having the axial direction D1 as the longitudinal direction), and are formed on the outer peripheral surface 221a so as to be arranged at equal intervals along the circumferential direction D2.
[Thin Thick Yarn spinning method]

The draft device 3 configured as described above is used to generate a fiber bundle F that enables spinning of a yarn Y (so-called “Thin Thick Yarn”) whose thickness changes periodically. As a spinning method for spinning such a yarn Y, the speed of the fiber bundle F delivered from the draft device 3 is preferably 300 to 700 m / min. The draft ratio of the back roller to 40 and the front roller to 10 (the peripheral speed of the front roller to 10 with respect to the back roller to 40) is preferably 50 to 500 times. The draft ratio of the back roller to 40 and the third roller to 30 (the peripheral speed of the third roller to 30 to the back roller to 40) is preferably 2.0 to 4.0 times, and is 2.5 to 3. More preferably, it is 5 times. The draft ratio of the third roller to 30 and the middle roller to 20 (the peripheral speed of the middle roller to 20 to the third roller to 30) is preferably 1.1 to 3.0 times, and 1.5 to 2.5 times. It is more preferable that it is doubled. The draft ratio of the middle roller to 20 and the front roller to 10 (the peripheral speed of the front roller to 10 with respect to the middle roller to 20) is preferably 15 to 55 times, more preferably 25 to 45 times. The distance between the front roller to 10 and the middle roller to 20 is 48 to 49 mm, the distance between the middle roller to 20 and the third roller to 30 is 35 to 45 mm, and the distance between the third roller to 30 and the back roller to 40 is 38. It is preferably ~ 47 mm.

An example of "dimensions related to each recess 223 of the middle top roller 22" when the spinning method is carried out under the above conditions is as follows. The diameter of the outer peripheral surface 221a of the roller main body 221 is preferably 20 to 30 mm, more preferably 24 to 28 mm, and even more preferably 25.8 mm. The length of the roller body 221 in the axial direction D1 is preferably 25 to 50 mm, more preferably 35 to 45 mm, and even more preferably 40 mm. The length of each recess 223 in the axial direction D1 is preferably 10 to 26 mm, more preferably 15 to 21 mm, and even more preferably 18 mm. The length of each recess 223 in the circumferential direction D2 is preferably 2 mm to 15 mm, more preferably 4 mm to 12 mm, and even more preferably 5 mm to 10 mm. The depth of the deepest portion of each recess 223 is preferably 0.2 mm to 3 mm, more preferably 0.2 mm to 2 mm, and even more preferably 0.3 mm to 0.9 mm.

In this example, four recesses 223 are arranged at equal intervals along the circumferential direction D2. When spinning a chemical fiber having a fiber length of 38 to 40 mm, the length of each recess 223 in the circumferential direction D2 is preferably 4 to 15 mm. When spinning natural cotton fibers having a fiber length of 22 to 30 mm, the length of each recess 223 in the circumferential direction D2 is preferably 2 to 10 mm. When spinning a cotton mixed yarn, the length of each recess 223 in the circumferential direction D2 is preferably 2 to 15 mm. The length of each recess 223 in the axial direction D1 is preferably longer than the region through which the fiber bundle F passes so that all of the fiber bundle F can pass through the recess 223.

Further, in the present embodiment, the "cross-sectional shape on the plane perpendicular to the axial direction D1" of the portion cut off from the columnar middle top roller 22 (the portion corresponding to the recess 223) is the D shape. In this case, the depth of the recess 223 and the length of the recess 223 in the circumferential direction D2 have a correspondence relationship expressed by a predetermined mathematical formula (a relationship in which one is determined and the other is inevitably determined). Specifically, the depth of the recess 223 and the length of the recess 223 in the circumferential direction D2 have a relationship that the length of the recess 223 in the circumferential direction D2 increases as the depth of the recess 223 increases. In the present embodiment, it is preferable that the size of the recess 223 is set with an emphasis on the length of the recess 223 in the circumferential direction D2 rather than the depth of the recess 223.

As shown in FIG. 6, the yarn Y (for example, the yarn spun using short fibers (staple fibers)) produced by carrying out the spinning method under the above conditions has a normal thickness. The staple portion Ya, the thin portion Yb, and the thick portion Yc appear periodically. When the thickness of the thread Y is measured by "USTER TESTER 6" manufactured by USTER, the following relational expression holds for the thread Y.
Part Ya thickness x 110% ≤ Part Yc thickness ≤ Part Ya thickness x 200%
Part Ya thickness x 10% ≤ Part Yb thickness ≤ Part Ya thickness x 90%
10 mm ≤ distance between the centers of adjacent portions Yb and parts Yc ≤ 1 m
20 mm ≤ period where partial Yc appears ≤ 10 m

When the depth of the recess 223 is increased, the rate of change in the pressure applied to the fiber bundle F increases, so that the rate of change in the thickness of the thread Y (the rate of change in the thickness of the portion Yb with respect to the thickness of the portion Ya, the rate of change in the portion Ya). The rate of change in the thickness of the partial Yc with respect to the thickness) increases. Increasing the length of the recess 223 in the circumferential direction D2 increases the lengths of the adjacent portions Yb and Yc. Increasing the number of recesses 223 in the circumferential direction D2 shortens the period in which the partial Yb appears and the period in which the partial Yc appears. Therefore, by preparing a plurality of types of middle top rollers 22 in which at least one of the shapes and the number of the recesses 223 is different from each other, it is possible to cope with the production of a plurality of types of yarn Y.
[Action and effect]

In the draft device 3, a recess 223 is formed on the outer peripheral surface 221a of the middle top roller 22 on which the second apron belt 26 is hung. As a result, the pressure changes periodically while the state in which sufficient pressure is applied to the fiber bundle F is maintained. Further, the recess 223 is formed so that the outer peripheral surface 221a is continuous when viewed from the axial direction D1. As a result, the vibration generated in the roller body 221 of the middle top roller 22 is suppressed. Therefore, according to the draft device 3, it is possible to generate a fiber bundle F that enables stable spinning of the yarn Y whose thickness changes periodically. Further, according to the spinning machine 1, the yarn Y whose thickness changes periodically can be stably spun.

In the draft device 3, the recess 223 is formed on the outer peripheral surface 221a of the roller body 221 of the middle top roller 22, and the recess is not formed on the outer peripheral surface of the roller body 21 of the middle bottom roller 21. As a result, the cycle of change in the pressure applied to the fiber bundle F can be made constant without performing special control or the like, so that the fiber that enables spinning of the yarn Y whose thickness changes at a constant cycle. The bundle F can be generated. Further, for example, when the roller main body 221 having the recess 223 formed on the outer peripheral surface 221a is replaced according to the type of the yarn Y to be spun, the replacement work can be facilitated.

In the draft device 3, the recess 223 is formed in the central region of the outer peripheral surface 221a in the axial direction D1. As a result, it is possible to surely cause a change in pressure in the traveling fiber bundle F.

In the draft device 3, a plurality of recesses 223 are formed on the outer peripheral surface 221a so as to be lined up along the circumferential direction D2. As a result, the cycle of change in the pressure applied to the fiber bundle F can be shortened, so that the fiber bundle F capable of spinning the yarn Y whose thickness changes in a short cycle can be generated.

In the draft device 3, a plurality of recesses 223 have the same shape as each other and are formed on the outer peripheral surface 221a so as to be arranged at equal intervals along the circumferential direction D2. As a result, the cycle of change in pressure applied to the fiber bundle F can be shortened and made constant, so that the fiber bundle F capable of spinning the yarn Y having a short thickness and changing at a constant cycle can be generated. Can be done.

In the draft device 3, the recess 223 is formed on the outer peripheral surface 221a so that the depth increases toward the central region of the recess 223 along the circumferential direction D2. As a result, the pressure applied to the fiber bundle F can be gradually changed so that the pressure applied to the fiber bundle F gradually decreases and gradually increases, so that the spinning of the yarn Y whose thickness gradually changes. It is possible to generate a fiber bundle F that enables the above.

In the draft device 3, the recess 223 is formed by a surface 223a that is parallel to the tangent plane TP of the outer peripheral surface 221a and intersects the outer peripheral surface 221a. As a result, the recess 223 whose depth increases toward the central region can be easily formed on the outer peripheral surface 221a of the roller main body 221.

In the draft device 3, the roller body 221 of the middle top roller 22 is made of metal. As a result, the vibration generated in the roller body 221 can be suppressed more reliably.

In the spinning method carried out by the spinning machine 1, the speed of the fiber bundle F delivered from the draft device 3 is 300 m / min or more. In such a case, if the recess 223 is formed on the outer peripheral surface 221a of the middle top roller 22, the yarn Y whose thickness changes at an appropriate cycle can be stably spun.

In the spinning method carried out by the spinning machine 1, the draft ratio of the middle roller to 20 to the third roller to 30 is 1.1 to 3.0 times, and the draft ratio of the front roller to 10 to the middle roller to 20 is 15 to 10. It is 55 times. In such a case, if the recess 223 is formed on the outer peripheral surface 221a of the middle top roller 22, the yarn Y whose thickness changes at an appropriate cycle can be spun more stably.
[Modification example]

The present invention is not limited to the embodiments described above. For example, the number of roller pairs included in the draft device 3 may be three or more. Therefore, the draft device 3 does not have to have a back roller pair 40. The roller body 221 may be made of a material other than metal.

For example, when the middle bottom roller 21 is driven for each spinning unit 2, a recess is formed on the outer peripheral surface of the roller body of the middle bottom roller 21, and the outer peripheral surface of the roller body 221 of the middle top roller 22 is formed. The recess 223 may not be formed in the 221a. Alternatively, a recess may be formed on the outer peripheral surface of the roller body of the middle bottom roller 21, and a recess 223 may be formed on the outer peripheral surface 221a of the roller body 221 of the middle top roller 22.

If a recess is formed on at least one outer peripheral surface (outer peripheral surface of the roller body) of the middle bottom roller 21 and the middle top roller 22 so that the outer peripheral surface is continuous when viewed from the axial direction of the roller body, the present invention is concerned. The shape and number of the recesses are not limited to the shape and number of the recesses 223 described above.

As shown in FIG. 7, the recess 223 may have an oval shape with the axial direction D1 as the longitudinal direction. The recess 223 may have a rectangular shape with the circumferential direction D2 as the longitudinal direction or an oval shape with the circumferential direction D2 as the longitudinal direction. The recess 223 may have a square shape in which the length in the axial direction D1 and the length in the circumferential direction D2 are equal to each other.

As shown in FIG. 8, the recess 223 may have a circular shape. The circular recess 223 preferably has a diameter of 8 mm to 16 mm. The diameter of the circular recess 223 can be changed to a size that can support the second apron belt 26 in the "region where the recess 223 is not formed" on both sides of the recess 223 in the axial direction D1. The length (width) of the second apron belt 26 in the axial direction D1 is, for example, 32 mm. The recess 223 shown in FIG. 8 is formed in the central region of the roller body 221 in the axial direction D1 (the recesses 223 are not formed at both ends of the roller body 221 in the axial direction D1), but the recess 223 is formed in the axial direction D1. May be formed so as to be biased to one side from the central region of the roller body 221.

As shown in FIG. 9, the recess 223 may extend diagonally across both ends of the roller body 221 in the axial direction D1. Also in this case, in all the line segment SLs parallel to the axial direction D1 and located on the outer peripheral surface 221a, if a part of the outer peripheral surface 221a is present in at least a part of each line segment SL (any recess 223). The same applies to the above), the outer peripheral surface 221a is continuous when viewed from the axial direction D1.

The plurality of recesses 223 may have different shapes from each other.

The plurality of recesses 223 may be formed on the outer peripheral surface 221a so as to be arranged at irregular intervals along the circumferential direction D2.

The middle bottom roller 21 and / or the middle top roller 22 in which the recess 223 is formed may not have the roller end 222. Alternatively, roller end portions 222 having a diameter different from that of the roller main body 221 may be provided on both sides of the roller main body 221 in the axial direction D1.

The recess of the present invention means a portion recessed with respect to the outer peripheral surface of the roller body. Therefore, the recess of the present invention is not limited to the recess having a bottom surface, and includes a notch formed on the outer peripheral surface, an opening formed on the outer peripheral surface, a hole formed on the outer peripheral surface, and the like.

In the spinning unit 2, the traveling direction of the yarn Y is switched in the yarn storage device 6, but the traveling direction of the yarn Y may not be switched in the yarn storage device 6. In the spinning unit 2, each device may be arranged so that the yarn Y supplied on the upper side is wound on the lower side. That is, in the spinning unit 2, the draft device 3, the air spinning device 4, the yarn monitoring device 5, the yarn storage device 6, and the take-up device 8 are moved from the upper side to the lower side so that the yarn Y runs from the upper side to the lower side. They may be arranged in this order toward the side.

A delivery roller and a nip roller may be arranged between the air spinning device 4 and the yarn storage device 6 in order to draw the yarn Y from the air spinning device 4. When the delivery roller and the nip roller are provided, instead of the yarn storage device 6, a slack tube or a mechanical compensator that absorbs the slack of the yarn Y by the suction air flow may be provided. The yarn monitoring device 5 may be arranged between the yarn storage device 6 and the take-up device 8.

The thread splicing device 7, the first catching guide device 9a, and the second catching guide device 9b may be provided on a thread splicing carriage that can move along the arrangement direction of the plurality of spinning units 2. A yarn drawing device for drawing out the yarn Y from the package P may be provided on the ball lifting carriage that can move along the arrangement direction of the plurality of spinning units 2.

The thread splicing device 7 may be a mechanical knotter or the like. Alternatively, the yarn Y may be spliced by restarting the drafting of the sliver S by the draft device 3 and the generation of the yarn Y by the air spinning device 4 in a state where the yarn Y from the package P is sent back to the air spinning device 4. good.

In the winding device 8, a twill swing groove is not formed on the surface of the take-up drum 8b, and the thread Y is twilled when the thread Y is wound on the bobbin B by a separately provided twill swing device. May be good. In the take-up device 8, the bobbin B may be driven and rotated, and the take-up drum 8b in contact with the bobbin B may be driven and rotated.

In the draft device 3, each bottom roller 11,21,31,41 is rotationally driven by a common one to three drive motors via a transmission at different rotational speeds so as to be faster toward the downstream side. You may.

1 ... Spinning machine, 3 ... Draft device, 4 ... Air spinning device, 8 ... Winding device, 10 ... Front roller pair (1st roller pair), 11 ... Front bottom roller (1st drive roller), 12 ... Front top Rollers (1st driven roller), 20 ... Middle roller pair (2nd roller pair), 21 ... Middle bottom roller (2nd drive roller), 22 ... Middle top roller (2nd driven roller, draft roller), 25 ... No. 1 apron belt, 26 ... second apron belt, 30 ... third roller pair (third roller pair), 31 ... third bottom roller (third drive roller), 32 ... third top roller (third driven roller), 221 ... roller Main body, 221a ... outer peripheral surface, 223 ... concave, 223a ... surface, D1 ... axial direction, D2 ... circumferential direction, TP ... tangent plane, S ... sliver (fiber bundle), F ... fiber bundle, Y ... thread, P ... package ..

Claims (13)

A first roller pair, which is arranged on the most downstream side in the traveling direction of the fiber bundle and has a first driving roller and a first driven roller,
A second roller pair, which is arranged on the upstream side in the traveling direction with respect to the first roller pair so as to be adjacent to the first roller pair and has a second driving roller and a second driven roller,
A third roller pair, which is arranged on the upstream side in the traveling direction with respect to the second roller pair so as to be adjacent to the second roller pair and has a third driving roller and a third driven roller,
The first apron belt hung on the outer peripheral surface of the roller body of the second drive roller, and
A second apron belt hung on the outer peripheral surface of the roller body of the second driven roller is provided.
A draft device in which a recess is formed on at least one of the outer peripheral surfaces of the second driving roller and the second driven roller so that the outer peripheral surfaces are continuous when viewed from the axial direction of the roller body. The draft device according to claim 1, wherein the recess is formed on the outer peripheral surface of the second driving roller or the second driven roller. The draft device according to claim 2, wherein the recess is formed on the outer peripheral surface of the second driven roller. The draft device according to any one of claims 1 to 3, wherein the recess is formed in a central region of the outer peripheral surface in the axial direction. The draft device according to any one of claims 1 to 4, wherein a plurality of recesses are formed on the outer peripheral surface so as to be arranged along the circumferential direction of the roller body. The draft device according to claim 5, wherein the plurality of recesses have the same shape as each other and are formed on the outer peripheral surface so as to be arranged at equal intervals along the circumferential direction. The recess according to any one of claims 1 to 6, wherein the recess is formed on the outer peripheral surface so that the depth increases toward the central region of the recess along the circumferential direction of the roller body. Draft device. The draft device according to claim 7, wherein the recess is formed by a surface that is parallel to the tangent plane of the outer peripheral surface and intersects the outer peripheral surface. The draft device according to any one of claims 1 to 8, wherein the roller body is made of metal. The draft device according to any one of claims 1 to 9,
An air spinning device that produces yarn by twisting the fiber bundle drafted by the draft device by a swirling air flow.
A spinning machine comprising a winding device for winding the yarn produced by the air spinning device to form a package. A spinning method carried out by the spinning machine according to claim 10.
A spinning method in which the speed of the fiber bundle delivered from the draft device is 300 m / min or more. The draft ratio of the second roller pair to the third roller pair is 1.1 to 3.0 times.
The spinning method according to claim 11, wherein the draft ratio of the first roller pair to the second roller pair is 15 to 55 times. A draft roller used in a draft device with an apron belt hung.
Equipped with a roller body with an outer peripheral surface,
A draft roller having a recess formed on the outer peripheral surface so that the outer peripheral surface is continuous when viewed from the axial direction of the roller body.

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