CN106987935B

CN106987935B - Tension device, drafting device and spinning machine

Info

Publication number: CN106987935B
Application number: CN201610982476.9A
Authority: CN
Inventors: 庄田裕一; 冈正毅; 松井利裕
Original assignee: Murata Machinery Ltd
Current assignee: Murata Machinery Ltd
Priority date: 2015-11-11
Filing date: 2016-11-08
Publication date: 2021-05-18
Anticipated expiration: 2036-11-08
Also published as: JP2017089058A; CN106987935A; EP3173511A1

Abstract

The invention provides a tension device, a drafting device and a spinning machine. The tension device (40) is provided with: rollers (54 a-54 d) for supporting the tangential belt (18 a); a support body (52) in which bearings (56 a-56 d, 58 a-58 d) for detachably positioning rollers (54 a-54 d) are arranged in one direction; and a main body part (50) extending along the direction of the rotating shaft of the bottom roller (16a) and detachably fixing the support body (52) in a manner that the bearings (56 a-56 d, 58 a-58 d) are arranged along the drafting direction of the fiber bundle.

Description

Tension device, drafting device and spinning machine

Technical Field

The invention relates to a tension device, a drafting device and a spinning machine.

Background

A spinning machine including a Draft device that drafts (Draft) a fiber bundle and a spinning device that twists the drafted fiber bundle to produce a spun yarn is known. In the draft device, a plurality of roller pairs are arranged in the draft direction of the fiber bundle. A tangential belt for gripping (pinching) and drawing the fiber bundle is provided between the lower roller of one roller pair and a tension Bar.

DE102005000990A describes a drafting system with a tensioner (Belt Bridge) provided with five rollers capable of rotating.

According to the tensioner of DE102005000990A, the friction between the tensioner and the tangential belt when the tangential belt rotates can be reduced.

In such a draft device, the tangential belt affects the yarn quality by the gripping position (clamping position) and the gripping force of the fiber bundle. In particular, in a draft device that drafts a plurality of types of fiber bundles, it is required to be able to change the state of support of the fiber bundles by the apron with a high degree of freedom in accordance with the fiber bundles. However, in the above-described conventional tensioner, the gripping position (clamping position) and the gripping force of the tow by the tangential belt cannot be easily adjusted.

Disclosure of Invention

The invention aims to provide a tension device, a drafting device and a spinning machine which can easily change the supporting state of a fiber bundle by a tangential belt.

The tensioner of the present invention is provided in a draft device for drafting a fiber bundle by a roller pair including a lower roller and an upper roller, and a tangential belt is stretched between the lower roller and the tensioner, and the tensioner includes: a support member supporting the tangential belt; a replacement member in which positioning portions for detachably positioning the support member are arranged in one direction; and a main body portion extending in the direction of the rotation axis of the bottom roller and detachably fixing the replacement member so that the positioning portions are aligned in the draft direction of the fiber bundle.

In the tension tool having this configuration, the support member is detachably held in the replacement member, and therefore, for example, the clamping force of the tow by the tow can be easily adjusted by replacing the support member with one having a different amount of protrusion from the replacement member or with one having a different contact area with the tow. In addition, the main body can be replaced with, for example, a replacement member in which the positions of the positioning portions in the array direction are different from each other, and thus the position of the support member in the array direction can be easily changed. That is, the position of the fiber bundle held by the tangential belt can be easily adjusted. As a result, the state of support of the fiber bundle by the tangential belt can be easily changed.

In one embodiment, the positioning portion may be formed so that the support members having different shapes can be attached and detached. According to the tension tool of this configuration, the support members having different projecting amounts from the replacement member or the support members having different contact areas with the tangential belt can be replaced with the support members, and therefore the clamping force of the tangential belt with respect to the fiber bundle can be easily adjusted. Further, for example, by selecting the presence or absence of the attachment support member, the position of the tangential belt for clamping the fiber bundle can be easily adjusted.

In one embodiment, the main body portion may be formed as an exchangeable member in which the positions of the positioning portions in the arrangement direction are different from each other and/or the shapes of the positioning portions are different from each other. According to the tension tool of this configuration, the position of the support member in the arrangement direction can be changed by replacing the replacement member with the positioning portion in the arrangement direction at a different position. That is, the position of the fiber bundle held by the tangential belt can be easily adjusted. Further, according to the tensioner of this configuration, since the positioning portions have different shapes from each other, the support members having different projecting amounts from the exchangeable member or the support members having different contact areas with the tangential belt can be held, and therefore, the clamping force of the tangential belt with respect to the fiber bundle can be easily adjusted.

In one embodiment, the support member may be a roller that is rotatable about a rotation axis extending in the same direction as the extending direction of the main body. According to the tension device with the structure, the friction between the tension device and the tangential belt when the tangential belt rotates can be reduced.

In one embodiment, the positioning portion may be a bearing that rotatably supports the rotation shaft of the roller. According to the tension tool having this configuration, the support member formed of the roller can be easily held.

The draft device according to the present invention includes a roller pair including a lower roller and an upper roller, the tension device, and a tangential belt stretched over the lower roller and the tension device.

According to the draft device having this configuration, the state of supporting the fiber bundle by the apron can be easily changed.

The spinning machine according to the present invention includes the draft device, an air-jet spinning device that twists a fiber bundle drafted by the draft device to produce a yarn, and a winding device that winds up the yarn produced by the air-jet spinning device into a package.

According to the spinning machine having this configuration, in the draft device, the state of supporting the fiber bundle by the apron can be changed with a high degree of freedom in accordance with the fiber bundle. Thus, the position (clamping position) and the force for gripping the fiber bundle by the tangential belt are appropriately adjusted in accordance with the fiber bundle. As a result, a high-quality yarn can be produced.

According to the present invention, the state of supporting the fiber bundle by the tangential belt can be easily changed.

Drawings

Fig. 1 is a front view of a spinning machine including a draft device according to an embodiment.

Fig. 2 is a side view of a spinning unit of the spinning machine shown in fig. 1.

Fig. 3 is a plan view of the draft device of the spinning unit shown in fig. 2.

Fig. 4 is a side view of the drafting device of the spinning unit shown in fig. 2.

Fig. 5 is a perspective view showing the middle roller pair.

Fig. 6 is a cross-sectional view of the middle roller pair.

Fig. 7 is a perspective view showing the tensioner.

Fig. 8 is a perspective view showing the tension tool with the roller omitted.

Fig. 9 is an exploded perspective view of the main body and the support body shown in fig. 8.

Fig. 10 is an exploded perspective view showing the support body in which the position of the bearing is different.

Fig. 11 is a perspective view showing a tension tool in which a roller is disposed on the support body of fig. 10.

Fig. 12 is a perspective view showing a tensioner according to another embodiment.

Fig. 13 is a sectional view taken along line a-a in fig. 12.

Fig. 14 is a perspective view showing a tensioner according to another embodiment.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant description thereof is omitted.

As shown in fig. 1, the spinning machine 1 includes a plurality of spinning units 2, a yarn splicing cart 3, a doffing cart (not shown), a 1 st end frame 4, and a 2 nd end frame 5. The plurality of spinning units 2 are arranged in a row. Each spinning unit 2 generates a yarn Y and winds it into a package P. When a certain spinning unit 2 cuts the yarn Y or the yarn Y is cut for some reason, the yarn splicing cart 3 performs a yarn splicing operation in the spinning unit 2. When the package P is fully wound in a spinning unit 2, the doffing cart doffs the package P and supplies a new bobbin B to the spinning unit 2.

The 1 st end frame 4 houses a recovery device for recovering leftover fibers, waste fibers, and the like generated in the spinning unit 2. The 2 nd end frame 5 houses an air supply unit for supplying air to each part of the spinning machine 1 by adjusting the air pressure of compressed air (air) supplied to the spinning machine 1, a drive motor for supplying power to each part of the spinning unit 2, and the like. The 2 nd end frame 5 is provided with a body control device 100, a display screen 102, and input keys 104. The machine body control device 100 centrally manages and controls each part of the spinning machine 1. The display screen 102 can display information and the like related to the setting content and/or the state of the spinning unit 2. The operator can perform the setting operation of the spinning unit 2 by appropriately operating the input key 104. Note that the display screen 102 may be configured as a touch-panel display, and the touch-panel display may be operated instead of the input keys 104.

As shown in fig. 1 and 2, each spinning unit 2 includes, in order from the upstream side in the traveling direction of the yarn Y, a draft device 6, an air-jet spinning device 7, a yarn monitoring device 8, a tension sensor 9, a yarn accumulating device 11, a waxing device 12, and a winding device 13. The unit controller 10 is provided for each of a predetermined number of spinning units 2, and controls the operation of the spinning units 2.

The draft device 6 drafts the sliver (fiber bundle) S. The draft device 6 includes a rear roller pair 14, a third roller pair 15, a middle roller pair 16, and a front roller pair 17 in this order from the upstream side in the traveling direction of the sliver S. Each of the roller pairs 14, 15, 16, and 17 has a bottom roller and a top roller. The bottom roller is rotationally driven by a drive motor provided in the 2 nd end frame 5 or a drive motor provided in each spinning unit 2. A tangential belt (lower belt) 18a is provided to the lower roller of the middle roller pair 16. A tangential belt (upper belt) 18b is provided to the upper roller of the middle roller pair 16.

The air-jet spinning device 7 twists the fiber bundle F drafted by the draft device 6 with a swirling air flow to generate a yarn Y. More specifically (not shown), the air-jet spinning device 7 includes a spinning chamber, a fiber guide section, a swirling-air-flow generating nozzle, and a hollow guide shaft body. The fiber guide section guides the fiber bundle F supplied from the draft device 6 on the upstream side into the spinning chamber. The swirling-air-flow generating nozzle is disposed around a path along which the fiber bundle F travels. Air is ejected from the whirling airflow generating nozzle, thereby generating a whirling airflow in the spinning chamber. The whirling airflow reverses the fiber ends of the plurality of fibers constituting the fiber bundle F to rotate. The hollow guide shaft guides the yarn Y from the spinning chamber to the outside of the air-jet spinning device 7.

The yarn monitoring device 8 monitors information of the yarn Y traveling between the air-jet spinning device 7 and the yarn accumulating device 11, and detects the presence or absence of a yarn defect based on the monitored information. When detecting a yarn defect, the yarn monitoring device 8 transmits a yarn defect detection signal to the unit controller 10. The yarn monitoring device 8 detects a yarn defect, for example, an abnormal thickness of the yarn Y and/or a foreign substance contained in the yarn Y. The yarn monitoring device 8 also detects yarn breakage or the like. The tension sensor 9 measures the tension of the running yarn Y between the air spinning device 7 and the yarn accumulating device 11, and transmits a tension measurement signal to the unit controller 10. When the unit controller 10 determines that there is an abnormality based on the detection result of the yarn monitoring device 8 and/or the tension sensor 9, the yarn Y is cut in the spinning unit 2. Specifically, the supply of air to the air-jet spinning device 7 is stopped, and the yarn Y is cut by interrupting the generation of the yarn Y. Alternatively, the yarn Y may be cut by a cutter provided separately.

The waxing device 12 applies wax to the yarn Y between the yarn accumulating device 11 and the winding device 13.

The yarn accumulating device 11 eliminates slack of the yarn Y between the air-jet spinning device 7 and the winding device 13. The yarn accumulating device 11 has a function of stably drawing out the yarn Y from the air-jet spinning device 7, a function of preventing the yarn Y fed out from the air-jet spinning device 7 from being accumulated and slackened at the time of a yarn splicing operation of the yarn splicing cart 3 or the like, and a function of preventing a variation in tension of the yarn Y on the downstream side of the yarn accumulating device 11 from being transmitted to the air-jet spinning device 7.

The winding device 13 winds the yarn Y around the bobbin B to form a package P. The winding device 13 includes a cradle arm 21, a winding drum 22, and a traverse guide 23. The swing arm 21 rotatably supports the bobbin B. The cradle arm 21 is supported by a support shaft 24 so as to be able to swing, and brings the surface of the bobbin B or the surface of the package P into contact with the surface of the winding drum 22 with an appropriate pressure. A drive motor (not shown) provided in the 2 nd end frame 5 drives the take-up drums 22 of the plurality of spinning units 2 at once. Thereby, in each spinning unit 2, the bobbin B or the package P is rotated in the winding direction. The traverse guide 23 of each spinning unit 2 is provided on a shaft 25 shared by the plurality of spinning units 2. The drive motor of the 2 nd end frame 5 reciprocates the drive shaft 25 in the rotation axis direction of the winding drum 22, and the traverse guide 23 traverses the yarn Y with a predetermined width with respect to the rotating bobbin B or package P.

When the yarn Y is cut or broken for some reason in a certain spinning unit 2, the yarn splicing cart 3 moves to the spinning unit 2 and performs a yarn splicing operation. The joint carriage 3 has a joint device 26, a suction pipe 27, and a suction nozzle 28. The suction pipe 27 is rotatably supported by a support shaft 31, and captures the yarn Y from the air-jet spinning device 7 and guides the yarn Y to the yarn splicing device 26. The suction nozzle 28 is rotatably supported by a support shaft 32, and captures the yarn Y from the winding device 13 and guides the yarn Y to the yarn splicing device 26. The yarn splicing device 26 splices the guided yarns Y to each other. The yarn splicing device 26 is a splicer using compressed air, a knotter mechanically connecting the yarns Y, or the like.

When the yarn splicing operation is performed by the yarn splicing cart 3, the package P is rotated (reversed) in the reverse winding direction. At this time, the cradle arm 21 is moved by an air cylinder (not shown) to separate the package P from the winding drum 22, and the package P is reversed by a reverse rotation roller (not shown) provided on the joint carriage 3.

Next, the draft device 6 will be described in more detail.

As shown in fig. 3 and 4, the rear roller pair 14 includes a rear bottom roller 14a and a rear top roller 14b that face each other with a travel path R through which the yarn S travels. The third roller pair 15 includes a third bottom roller 15a and a third top roller 15b that face each other with the travel path R therebetween. The middle roller pair 16 has a middle lower roller 16a and a middle upper roller 16b opposed to each other with the travel path R therebetween. The front roller pair 17 includes a front bottom roller 17a and a front top roller 17b that face each other with the travel path R therebetween. The plurality of roller pairs 14, 15, 16, and 17 feed the sliver S supplied from a can (not shown) and guided by the fiber bundle guide 77 from the upstream side to the downstream side while drafting the sliver S.

The rear bottom roller 14a is rotatably supported by the rear roller housing 66. The third bottom roller 15a is rotatably supported by the third roller case 67. The middle bottom roller 16a is rotatably supported by the middle roller housing 68. The front bottom roller 17a is rotatably supported by the front roller case 69. The

lower rollers

14a, 15a, 16a, and 17a are rotated at different rotational speeds so that the downstream side becomes faster by the power from the 2 nd end frame 5. Further, at least a part or all of the

lower rollers

14a, 15a, 16a, and 17a may be rotated by a drive motor provided in each spinning unit 2.

The rear top roller 14b, the third top roller 15b, the top roller 16b, and the front top roller 17b are rotatably supported by the draft cradle 71. The

upper rollers

14b, 15b, 16b, and 17b are driven to rotate by being brought into contact with the

lower rollers

14a, 15a, 16a, and 17a at a predetermined pressure.

The draft cradle 71 is rotatable about the support shaft 72 between a position where the

top rollers

14b, 15b, 16b, and 17b contact the

bottom rollers

14a, 15a, 16a, and 17a with a predetermined pressure and a position where the

top rollers

14b, 15b, 16b, and 17b are separated from the

bottom rollers

14a, 15a, 16a, and 17 a. The draft cradle 71 is rotated by using a handle (not shown) provided to the draft cradle 71. The draft cradle 71 rotatably supports the

top rollers

14b, 15b, 16b, and 17b of the draft device 6 provided in each of the pair of adjacent spinning units 2. In other words, the draft cradle 71 is shared by the draft devices 6 provided in the pair of adjacent spinning units 2.

A regulating portion 74 called a guide or condenser, for example, is disposed between the third roller pair 15 and the middle roller pair 16. The restricting portion 74 is formed with a through hole 74a through which the sliver S passes. The width of the sliver S in the direction in which the rotation axes of the

rollers

14a, 14b, 15a, 15b, 16a, 16b, 17a, and 17b extend (hereinafter referred to as the "rotation axis direction") is limited to the width of the through hole 74a in the rotation axis direction. In this way, the restriction section 74 restricts the path traveled by the sliver S to the travel path R, and restricts the width of the sliver S in the rotation axis direction to the width of the through hole 74a in the rotation axis direction. The restricting portion 74 is supported by the supporting portion 75. The support portion 75 is located below the travel path R in the machine height direction, and is attached to the middle roller case 68 that rotatably supports the middle bottom roller 16 a. This maintains the position of the regulating portion 74 with respect to the middle roller pair 16. In fig. 1 and 2, the restricting portion 74 and the supporting portion 75 are omitted.

As shown in fig. 5 and 6, the tangential belt 18a is mounted on the middle bottom roller 16a and the tension device 40. The apron 18a is driven by the rotation of the middle bottom roller 16 a. The apron 18b is mounted on the middle top roller 16b and a apron tensioner (apron tension) 42. The apron tensioner 42 is supported by the draft cradle 71. The tangential belt 18b is driven by the rotation of the top roller 16b following the rotation of the middle bottom roller 16 a.

In the middle roller pair 16, the apron 18a is pressed by the tensioner 40, and the apron 18b is pressed by the apron tensioner 42, whereby the pressure is applied to the sliver S by the apron 18a and the apron 18b to clamp (nip) the sliver S.

Next, the tension tool 40 will be described in detail. As shown in any one of fig. 5 to 9, the tension tool 40 includes a main body 50, a support body (replacement member) 52, and rollers (support members) 54a, 54b, 54c, and 54 d.

The main body 50 extends in one direction and has a predetermined thickness. The main body 50 is made of a material such as metal. As shown in fig. 4, the main body 50 is disposed downstream of the middle bottom roller 16a (on the front bottom roller 17a side) in the travel path R of the sliver S. As shown in fig. 3, the main body 50 is arranged to extend in the same direction as the extending direction of the bottom roller 16a (the arrangement direction of the spinning units 2). In other words, the main body 50 is arranged to extend in the same direction as the direction in which the rotation axis of the bottom roller 16a extends. The main body 50 is provided, for example, in common to the draft devices 6 of two adjacent spinning units 2. One main body portion 50 may be provided for each spinning unit 2. The main body 50 is supported by a support mechanism not shown. As shown in fig. 9, the main body 50 has a recess 51. The recess 51 is formed by cutting out a part of the body 50 in the thickness direction, for example.

The support 52 rotatably supports the rollers 54a to 54d (see fig. 4). The support body 52 is formed of a material such as resin. As shown in fig. 9, the support body 52 is detachably provided to the main body 50. The support 52 is disposed and held in the recess 51 of the main body 50. The support body 52 is fixed to the main body 50 by a fixing member (not shown) such as a screw.

The support body 52 has a main body portion 52a, a 1 st end portion 52b, and a 2 nd end portion 52 c. The body 52a, the 1 st end 52b, and the 2 nd end 52c are integrally formed, for example. The main body 52a is a substantially rectangular plate-like member.

The 1 st end portion 52b and the 2 nd end portion 52c are disposed at the longitudinal end portions of the body portion 52a, respectively, and are provided along the width direction of the body portion 52 a. The 1 st end portion 52b and the 2 nd end portion 52c protrude from the surface of the body portion 52 a. That is, the thickness of the 1 st end portion 52b and the 2 nd end portion 52c is larger than the thickness of the body portion 52 a. Thus, the support body 52 has a substantially concave shape as viewed from the direction along the surface of the body portion 52 a.

The 1 st end portion 52b is provided with bearings (positioning portions) 56a, 56b, 56c, 56 d. The bearings 56a to 56d are disposed in the 1 st end portion 52b in this order from one end in the longitudinal direction of the 1 st end portion 52b (the width direction of the body portion 52 a) toward the other end. The 2 nd end portion 52c is provided with bearings (positioning portions) 58a, 58b, 58c, 58 d. The bearings 58a to 58d are disposed in the 2 nd end portion 52c in this order from one end of the 2 nd end portion 52c in the longitudinal direction toward the other end. The

bearings

56a and 58a are disposed at positions facing each other with the body 52a interposed therebetween. Similarly,

bearings

56b and 58b,

bearings

56c and 58c, and

bearings

56d and 58d are disposed at positions facing each other with main body 52a interposed therebetween.

The

bearings

56b and 56c and the

bearings

58b and 58c are grooves formed in the 1 st end portion 52b and the 2 nd end portion 52c, respectively. The

bearings

56a and 56d and the

bearings

58a and 58d are notches formed in the 1 st end portion 52b and the 2 nd end portion 52c, respectively. The bearings 56a to 56d and the bearings 58a to 58d have a shape (curved shape in the present embodiment) along the outer shape of the rollers 54a to 54 d. The bearings 58a to 58d may be formed in a U-shape or a V-shape when viewed from the axial direction.

The rollers 54a to 54d are supported by the bearings 56a to 56d and the bearings 58a to 58d so as to be detachable. Specifically, the bearing 56a and the bearing 58a are disposed on the roller 54a, and rotatably support the roller 54 a. The roller 54b is disposed with a bearing 56b and a bearing 58b, and the roller 54b is rotatably supported. The bearing 56c and the bearing 58c are disposed on the roller 54c, and rotatably support the roller 54 c. The bearing 56d and the bearing 58d are disposed on the roller 54d, and rotatably support the roller 54 d.

The rollers 54a to 54d are rotatably supported by the support body 52. The rollers 54a to 54d have a cylindrical shape. In the present embodiment, the rollers 54a to 54d have a substantially circular cross section, as shown in fig. 6. The rollers 54a to 54d are made of, for example, a material having abrasion resistance. The rollers 54a to 54d may be formed by coating the surfaces thereof with a material having abrasion resistance. The surfaces of the rollers 54a to 54d may be in a state where irregularities or the like are hardly present (smooth state), or may be subjected to mirror finishing, pearskin finishing, embossing, grooving, or the like.

The diameter of the rollers 54a to 54d may be set as appropriate according to design, for example, between 3mm and 7 mm. In the present embodiment, the diameter of the roller 54b and the roller 54c is 3 mm. The diameter of the roller 54a and the roller 54d is 4 mm. The axial length of the rollers 54a to 54d (hereinafter simply referred to as "length") may be appropriately set in accordance with the width of the apron 18a within a range in which rigidity can be secured. Specifically, the length of the rollers 54a to 54d may be equal to or greater than the width of the tangential belt 18 a. In other words, the length of the rollers 54 a-54 d may be the same as the width of the tangential belt 18a, or may be greater than the width of the tangential belt 18 a. Fig. 5 shows an example in which the rollers 54a to 54d have a length larger than the width of the tangential belt 18 a. Further, the rollers 54a to 54d and/or the support 52 may be provided with a recognizable mark. Examples of the mark include an imprint, a color mark, and a seal.

As shown in fig. 7 and 8, the end of the roller 54a is supported by a bearing 56a and a bearing 58 a. The end of roller 54b is supported by bearing 56b and bearing 58 b. The end of roller 54c is supported by bearing 56c and bearing 58 c. The end of roller 54d is supported by bearing 56d and bearing 58 d. With this configuration, in the present embodiment, the rollers 54a to 54d are arranged in this order from the upstream side toward the downstream side in the draft direction. Both ends of each of the rollers 54a to 54d are in contact with the side surfaces of the recess 51 of the main body 50. This restricts the movement of the rollers 54a to 54d in the axial direction.

The intervals between the rollers 54a to 54d in the width direction of the main body portion 52a may be arranged at equal intervals or may be arranged at unequal intervals. In the present embodiment, the rollers 54a to 54d are arranged with a gap (clearance) therebetween in the width direction of the main body 52a, but may be arranged with almost no gap (no clearance).

The tangential belt 18a is erected on the lower roller 16a and the tensioner 40. Specifically, the apron 18a is stretched over the lower roller 16a and the roller 54d of the tension tool 40. The apron 18a is rotated in a driven manner with respect to the lower roller 16a rotated by a driving unit not shown. The upper portions of the rollers 54a to 54d are pressed downward by the belts 18 a. This regulates the vertical position of each roller 54a to 54 d. The rollers 54a to 54d are rotated in response to the rotation of the tangential belt 18 a.

As described above, since the rollers 54a to 54d are detachably supported by the bearings 56a to 56d and the bearings 58a to 58d, the support body 52 may be attached to the main body 50 in a state where the roller 54c is removed from the bearing 56c and the bearing 58c, for example. The rollers 54a to 54d removed from the bearings 56a to 56d and the bearings 58a to 58d are not limited to the roller 54 c. This allows the nip position P2 in the width direction of the main body 52a (the arrangement direction of the rollers 54a to 54d) to be adjusted. The interval between the rollers 54a to 54d is appropriately set according to the type of the sliver S.

The method of adjusting the pinching position P2 in the width direction of the main body 50 is not limited to the above method. For example, the support 52 fixed to the main body 50 may be replaced with the support 152 shown in fig. 10. The positions of the bearings 56a to 56d and the bearings 58a to 58d in the width direction of the main body portion 50 of the support body 152 are different from those of the support body 52. As shown in fig. 11, by fixing the rollers 54a to 54d held by the support body 152 to the main body 50, the nip position P2 in the width direction of the main body 50 can be adjusted. Further, the rollers 54a to 54d and/or the support 152 may be provided with a recognizable mark. Examples of the mark include an imprint, a color mark, and a seal.

Further, the support body 152 may be replaced with a support body 152 having not only different positions of the bearings 56a to 56d and the bearings 58a to 58d in the width direction of the main body 50 and different shapes of the bearings 56a to 56d and the bearings 58a to 58d from the support body 52. In this case, the nip position P2 in the width direction of the main body 50 can be adjusted, and a roller (support member) whose amount of protrusion from the

support bodies

52 and 152 is different from each other, or a roller (support member) whose contact area with the apron 18a is different from each other can be replaced. This makes it possible to easily adjust the clamping force of the leader 18a against the sliver S.

As shown in fig. 6, the roller 54b is disposed at a position where the distance D1 between the nip position P1 where the intermediate bottom roller 16a and the intermediate top roller 16b nip the yarn S and the nip position P2 where the roller 54b nips the yarn S via the leader 18a and the leader 18b is in the range of 11mm to 22 mm. In other words, the

bearings

56b and 58b are disposed at positions to support the roller 54b in a range where the distance D1 between the nip position P1 and the nip position P2 is not less than 11mm and not more than 22 mm. In the present embodiment, the distance D1 is set to 16mm to 17mm, for example.

The roller 54D is disposed at a position where the distance D2 between the nip position P1 and the end of the roller 54D on the front bottom roller 17a side is 35mm, for example. The linear distance between the nip position P1 and the nip position of the front lower roller 17a and the front upper roller 17b with respect to the sliver S is, for example, 47 mm.

As shown in fig. 6, the height position of the contact point between the roller 54b and the tangential belt 18a is higher than the height position of the contact points between the

other rollers

54a, 54c, and 54d and the tangential belt 18 a. That is, the roller 54b protrudes upward from the

rollers

54a, 54c, and 54 d. The contact point of the roller 54b and the apron 18a is located above the straight line connecting the contact point of the roller 54a and the apron 18a and the contact point of the roller 54d and the apron 18 a. The joint between the roller 54a and the apron 18a and the joint between the roller 54d and the apron 18a may be at the same height position or different height positions. The contact point of the roller 54c and the tangential belt 18a is located above the straight line connecting the contact point of the roller 54a and the tangential belt 18a and the contact point of the roller 54d and the tangential belt 18a, and below the contact point of the roller 54b and the tangential belt 18 a.

As described above, in the tension tool 40 according to the above embodiment, since the rollers 54a to 54d are detachably held by the support body 52, the nip position P2 in the width direction of the main body portion 50 can be easily adjusted by adjusting the presence or absence of attachment of the rollers 54a to 54 d. Further, by replacing the

support bodies

52 and 152 having the different shapes of the bearings 56a to 56d and the bearings 58a to 58d, it is possible to hold the rollers having the different amounts of protrusion from the

support bodies

52 and 152 or the rollers having the different contact areas with the apron 18 a. This makes it possible to easily adjust the clamping force of the leader 18a against the sliver S. As a result, the supporting state of the yarn S by the hook 18a can be easily changed.

In the tension tool 40 of the above embodiment, the operator appropriately replaces the

support bodies

52 and 152 and/or the rollers 54a to 54d according to the yarn type. The supports 52 and 152 and/or the rollers 54a to 54d are provided with a recognizable mark. This allows the operator to easily replace the support body and/or the roller suitable for the type of yarn, for example, by looking at an operation manual or the like (a table). Therefore, the rollers 54a to 54d can be easily and accurately arranged on the

support bodies

52 and 152 according to the type of the yarn S.

In the tension tool 40 of the above embodiment, since the rollers 54a to 54d are arranged to be rotatable about the rotation axis extending in the same direction as the extending direction of the main body portion 50, friction between the tension tool 40 and the belt 18a when the belt 18a rotates can be reduced.

According to the spinning machine 1 including the draft device 6 of the above embodiment, in the draft device 6, the supporting state of the sliver S by the apron 18a can be changed with a high degree of freedom in accordance with the sliver S. Thus, the holding position (gripping position) and holding force of the yarn S by the leader 18a are appropriately adjusted in accordance with the yarn S. As a result, a high-quality yarn Y can be produced.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment.

In the above embodiment, an example has been described in which the nipping position in the width direction of the main body portion 50 can be easily adjusted by adjusting the presence or absence of the attachment of the rollers 54a to 54d to the bearings 56a to 56d and the bearings 58a to 58d of the

support bodies

52 and 152, but the present invention is not limited to this. For example, as shown in fig. 12 and 13, in the tension tool, stepped rollers 59a to 59d having different (variable) diameters from each other between the shaft portions 59aa to 59da and the roller portion supporting the apron 18a may be disposed so as to be detachable and rotatable with respect to the bearings 53a to 53d of the support body 153. Thus, even if the diameters of the shaft portions 59aa to 59da are the same, the rollers having different amounts of protrusion from the support 153 or the rollers having different contact areas with the apron 18a can be held by replacing the shaft portions with stepped rollers having different diameters. This makes it possible to easily adjust the clamping force of the leader 18a against the sliver S.

In the above embodiment or the above modification, the description has been given by taking an example in which the rollers 54a to 54d are held so as to be rotatable with respect to the bearings 56a to 56d and the bearings 58a to 58d of the

support bodies

52 and 152, but the rollers 54a to 54d may be held so as not to rotate.

In the above embodiment or the above modification, the roller rotatable about the rotation axis is taken as an example of the support member for supporting the belt 18a, but the present invention is not limited to this, and for example, as shown in fig. 14, the support member 154 may be formed in an arc shape only in a portion in contact with the belt 18 a. Further, a groove 154a may be formed in a portion contacting the tangential belt 18 a. In this case, friction between the tension tool 40 and the tangential belt 18a when the tangential belt 18a rotates can be reduced.

In the above embodiment, the roller 54a to 54d has been described as an example in the form of a true circle in cross section. However, the cross section of the roller may be elliptical.

In the above embodiment, the description has been given of an example in which the rollers 54a to 54d are fixed to the

support bodies

52 and 152 by inserting the rollers 54a to 54d from above into the bearings 56a to 56d and the bearings 58a to 58d, but the present invention is not limited to this. For example, the bearings may be formed as circular holes, and the rollers 54a to 54d may be inserted into the bearings while sliding in the axial direction, thereby fixing the rollers to the support body.

In the above embodiment, a description has been given of a configuration in which the contact point between the roller 54b and the apron 18a is at a higher position than the contact points between the

other rollers

54a, 54c, and 54d and the apron 18a, as an example. However, the height positions of the contact points between the rollers 54a to 54d and the tangential belt 18a may be the same in the draft direction.

In the above embodiment, a description has been given of a configuration in which the roller 54b is disposed at a position where the distance D1 between the nip position P1 and the nip position P2 is in the range of 11mm to 22mm, as an example. However, it is preferable that at least one bearing (positioning portion) is formed at a position in a range where a distance D1 from a nip position P1 of the roller pair 16 on which the

tangential belts

18a and 18b are stretched is not less than 11mm and not more than 22mm, or in a range where the distance is not less than half the average fiber length of the drafted sliver S and is less than the average fiber length.

In the above embodiment, the number of the bearings 56a to 56d and the number of the bearings 58a to 58d are four (four sets), respectively, but the number is not limited to this. The bearing, i.e., the positioning portion, is preferably provided in plural (plural) sets. The number of the supporting members (rollers, etc.) provided in the positioning portion may be at least one.

The spinning machine may be, for example, a ring spinning frame, in addition to the spinning machine 1 having the air-jet spinning device 7. The tensioner and the draft device of the present invention can be applied to a textile machine other than a spinning machine.

Claims

1. A draft device is characterized by comprising:

a pair of rollers, which is composed of a lower roller and an upper roller and drafts the fiber bundle;

a tensioner; and

a tangential belt which is erected between the lower roller and the tensioner and the tension of which is adjusted by the tensioner,

the tension device is provided with:

a support member supporting the tangential belt;

a replacement member in which positioning portions for detachably positioning the support member are arranged in one direction; and

a main body portion extending in a direction of a rotation shaft of the bottom roller and detachably fixing the replacement member such that the positioning portion is aligned in a draft direction of the fiber bundle,

the main body portion is formed so that any one of the plurality of replacement members can be attached and detached, and the positions of the positioning portions in the draft direction of the fiber bundle are different from each other between the plurality of replacement members.

2. Drafting device as in claim 1,

the positioning portion is formed to be attachable to and detachable from the support member having different shapes.

3. Drafting device as in claim 1,

the positioning portions are different in shape from each other between the plurality of replacement parts.

4. Drafting device as in claim 2,

5. A drafting device as claimed in any one of claims 1 to 4,

the support member is a roller that is rotatable about a rotation axis extending in the same direction as the extending direction of the main body.

6. Drafting device as in claim 5,

the positioning portion is a bearing that rotatably supports a rotating shaft of the roller.

7. A spinning machine is characterized by comprising:

a drawing device as claimed in any one of claims 1 to 6;

an air-jet spinning device that twists the fiber bundle drafted by the draft device to generate a yarn; and

and a winding device that winds the yarn produced by the air-jet spinning device into a package.