JP2004316007A - Draft roller and drafting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drafting machine comprising a plurality of draft rollers, so designed as to reduce harmful effects of the grooves of the rollers under high-speed rotation and maintain sliver-gripping force and retain the service life of the mating roller of any pair of rollers. <P>SOLUTION: The drafting machine comprising the plurality of draft rollers functioning to draft fiber bundles while feeding them to the downstream side is provided. In this machine, the pair of draft rollers comprises a rubber top roller and a bottom roller composed alternately of inelastic components and elastic components in the circumferential direction of the circumferential surface of the roller. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a draft roller and a draft device for drawing and processing a fiber bundle (also referred to as sliver).
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a draft device, a roller draft device configured by a plurality of roller pairs that extend while nipping a sliver and feeding the sliver to a downstream side is known.
[0003]
Further, in the roller draft device, a plurality of roller pairs of a top roller and a bottom roller are disposed in the sliver feed direction, and drafting is performed by gradually increasing the rotation speed of each roller pair, A draft cradle is provided to integrally hold each top roller and support the bottom roller so as to be able to freely contact and separate from the bottom roller.
[0004]
The top roller is a rubber roller or a roller coated with rubber, and the bottom roller is a metal roller. Further, in order to draft the sliver reliably, the gripping force between the bottom roller and the top roller is important, and further, in order to reduce the adverse effect due to the accompanying airflow generated in the pair of rotating rollers, A plurality of grooves are provided on the outer surface in parallel with the roller axis.
[0005]
For example, various spinning devices are known as spinning devices for producing spun yarn by drafting a sliver (fiber bundle). Recently, a spinning nozzle having a hollow guide shaft (hollow spindle) and a spinning nozzle has a speed of 300 m / min or more. A spinning machine including a spinning device capable of spinning at high speed is also known. In slivers and spun yarns, which are sent at high speeds, such as recent spinning machines, the draft speed is high, so that the rotation speed of each draft roller is also high, and especially the feed roller at the end of the draft. Is significantly increased. For this reason, the influence of the accompanying airflow of the front roller rotating at a high speed is increasing, which is a problem.
[0006]
For this purpose, a front roller and a draft device in which a longitudinal groove is provided in a grooved roller having a lateral groove parallel to an axial direction on a metal bottom roller outer surface are known.
(For example, see Patent Document 1)
[0007]
[Patent Document 1]
Utility Model Registration No. 2517614 (Pages 1-3, FIG. 3)
[0008]
[Problems to be solved by the invention]
As the feed speed of the sliver and the spun yarn has been increased, the rotational speed of the front roller has also increased dramatically. Therefore, even in a draft device using a conventionally known grooved roller type front roller, adverse effects due to its high speed rotation have come to be seen.
[0009]
In other words, at the conventional relatively low spinning speed, the grooved roller, which has been considered suitable for preventing the influence of the accompanying airflow, disturbs the surrounding air as the feed speed increases. I knew it was.
[0010]
For this reason, when the grooved front roller is rotated at a high speed, the groove on the outer peripheral surface of the roller is a fin for stirring air, and even if the front roller provided with the vertical groove described in Patent Document 1 described above, The air turbulence caused by the high-speed rotation of the front roller having the lateral groove parallel to the axial direction has become larger than the accompanying airflow released through the groove.
[0011]
This problem is particularly remarkable in the case of the conventional bottom roller B having only the ridges b1 formed in the axial direction as shown in FIG. 6 and having no longitudinal groove.
[0012]
When the draft roller on which the ridge b1 is formed is rotated at a high speed, the number of repetitions of the ridge b1 which is a metal part and the groove b1 'with respect to the top roller T increases, and the top roller T comes into contact with the bottom roller B. Therefore, there is a problem that the surface temperature of the top roller T on the other side of the roller pair increases, the surface deteriorates quickly, and the life is shortened.
[0013]
SUMMARY OF THE INVENTION An object of the present invention is to use a draft device composed of a plurality of draft roller pairs, while reducing the adverse effects exerted by the groove portions of the rollers rotating at high speed, maintaining the gripping force of the sliver, and forming the roller pairs. To provide a draft roller and a draft device that do not reduce the life of the roller.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, an invention according to claim 1 is a draft roller composed of a roller pair including a bottom roller and a top roller, wherein at least one of the rollers constituting the roller pair has a circular shape. The roller is characterized by being provided with an inelastic portion made of an inelastic material and an elastic portion made of an elastic material alternately in the circumferential direction of the peripheral surface.
[0015]
According to the first aspect of the present invention having the above configuration, the surrounding air is not disturbed even when the roller is rotated at a high speed. Further, the holding force of the fiber bundle to be drafted is maintained, and the life of the roller is not deteriorated.
[0016]
The invention according to claim 2 is characterized in that the circumferential surface of the other roller of the pair of rollers is made of an elastic material.
[0017]
According to the invention according to claim 2 having the above configuration, when the draft roller is configured in combination with one of the rollers forming the roller pair, the gripping force can be improved by elastic deformation.
[0018]
The invention according to claim 3 is characterized in that the length of the circumferential inelastic portion of the circumferential surface of the roller on which the inelastic portions and the elastic portions are alternately arranged is longer than or approximately equal to the length of the elastic portion. .
[0019]
According to the invention according to claim 3 having the above configuration, the wear resistance of the roller is not reduced.
[0020]
According to a fourth aspect of the present invention, there is provided a draft device including a plurality of roller pairs for drawing while feeding a fiber bundle to a downstream side, wherein the draft roller according to any one of the first to third aspects is used as a front roller. It is a draft device that has been developed.
[0021]
According to the invention according to claim 4 having the above configuration, it is possible to obtain a draft device including a front roller that securely grips the sliver and does not disturb the surrounding air due to high-speed rotation.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a draft roller and a draft device according to the present invention will be described with reference to FIGS.
[0023]
First, a spinning machine M to which the present invention is applied will be described with reference to FIG. The spinning machine M has a configuration in which a large number of spinning units U are arranged. After a sliver L is sent to a draft device DR and formed into a spun yarn Y by a spinning unit Sp, the spun yarn Y is transferred to a nip roller Rn and a slab. It is wound around the winding unit WR via the catcher Z and the like to form a package PW. P denotes a yarn splicing device that performs splicing, and is configured to travel below the inside of the spinning machine M along the longitudinal direction of the spinning machine M.
[0024]
Further, as shown in FIG. 4, each spinning unit U is configured such that the sliver L stored in the can K arranged at the rear of the machine is inserted through the trumpet T via the guide G and conveyed to the draft device DR. In this configuration, the yarn is pulled to a predetermined thickness by passing through a roller draft portion where the feed speed is gradually increased, turned into a spun yarn Y by a spinning unit Sp, and wound around a winding unit WR on the front of the machine base to form a package PW. is there.
[0025]
The spinning unit Sp is formed from an air spinning device having a spinning nozzle and a hollow guide shaft, which is capable of high-speed spinning at a spinning speed of 300 m / min or more, but is not particularly limited, and has two stages. A spinning device including a pneumatic spinning nozzle may be used. Further, a spinning device that includes a spinning nozzle and a pair of additional rollers and that can perform high-speed spinning at a spinning speed of several hundred m / min may be used.
[0026]
Furthermore, the present invention can be applied to draft devices such as other spinning machines, roving machines, and drawing machines that perform high-speed drafting.
[0027]
As shown in FIG. 3, the draft device DR is a so-called 4-wire draft device including a back roller Rb, a third roller Rt, a middle roller Rm having an apron belt E, and a front roller Rf. In this configuration, a pair of upper and lower rollers are arranged along the feed direction.
[0028]
The draft device DR is a device that extends a sliver L supplied through a trumpet T, which is a guide for inserting the sliver, to a predetermined thickness, and gradually increases the rotation speed of each roller from an upstream side to a downstream side. Draft is performed by sending sliver L while increasing. The sliver L drafted to a predetermined thickness is supplied to the spinning unit Sp, where it is formed into a spun yarn Y.
[0029]
Further, a pair of upper and lower rollers constituting each roller are respectively a bottom roller serving as a lower roller disposed on the main body frame side of the spinning machine and a top roller configured to be able to freely contact and separate from the bottom roller. It is configured.
[0030]
The back top roller Rb1, the third top roller Rt1, the middle top roller Rm1, and the front top roller Rf1, which are the respective top rollers, are integrally mounted on the draft cradle 6, and the support shaft 8 is rotated about the rotation center. By rotating the entire draft cradle 6, the top roller and the bottom roller are brought into and out of contact with each other.
[0031]
This turning operation is performed by gripping the handle 9, and when the draft cradle 6 is lowered, the hook 9 a at the lower end of the handle 9 is engaged with the fixed roller 10, and the vertical The configuration is such that the pressed state of the pair of top roller and bottom roller is maintained. This configuration is the same as a conventionally well-known roller draft device.
[0032]
The distance between the draft rollers is related to the fiber length of the fiber constituting the sliver L that is inserted while being drafted, and is a dimension to be reviewed each time the quality of the sliver L as a spinning raw material is changed. For this purpose, among the bottom rollers, the front bottom roller Rf2 is fixed to the machine frame, but the middle bottom roller Rm2, the third bottom roller Rt2, and the back bottom roller Rb2 are It is configured to move slidably in the direction of the arrow in FIG. 3 and to be fixed at a predetermined roller interval.
[0033]
Further, the draft cradle 6 is provided with a side guide 7 provided with a predetermined pitch between the rollers, and the top guides are disposed on the side guide 7 with a predetermined pitch between the rollers and are integrally formed. It is a configuration to be mounted. Therefore, when the distance between the top rollers is changed, it is necessary to change to a side guide 7 having a new pitch. At this time, the position of the front roller Rf is fixed and serves as a reference when changing the distance between the top rollers.
[0034]
Here, the draft roller of this embodiment in which an elastic body is embedded in the lateral groove of the front bottom roller will be described with reference to FIGS. The bottom roller 1 is a metal roller in which a metal shaft 1A and a draft roller portion having an outer diameter larger than the shaft 1A are integrally formed. The bottom roller 1, which is a draft roller portion, is attached to the shaft 1A. It is provided so as to protrude by a predetermined step. The protruding roller outer surface is provided with a lateral groove parallel to the axial direction. The lateral groove is composed of a convex part 2 and a groove part 3, and an elastic material 4 is attached to the groove part 3 by baking and bonding. This is a cylindrical roller having no groove by filling the groove of the grooved roller.
[0035]
That is, the metal convex portion 2 which is an inelastic material is an inelastic portion, and a portion where the elastic material 4 is baked and adhered is an elastic portion.
[0036]
The bottom roller 1 rotates in the direction of the arrow 1a, and the top roller 5 forming a pair with the bottom roller 1 rotates in the direction of the arrow 5a by being driven to rotate by the bottom roller that is positively driven. By holding the sliver L by this rotation and pulling it, the sliver L sent out from the slow-rotating roller on the upstream side is drafted.
[0037]
At this time, in the case of the conventional grooved roller, when the number of rotations of the roller increases, the groove portion also serves as a fin that disturbs the air around the roller. The turbulence is increased, which disturbs the arrangement of the short fibers.
[0038]
For example, in the case of a short fiber spinning bottom roller having a diameter of about 30 mm, when the number of rotations is 3000 rotations / minute or more, the groove portion causes air around the roller to be disturbed.
[0039]
For this purpose, as shown in the present embodiment, an elastic material such as synthetic rubber is baked and bonded to the groove 3 to form a draft roller using a cylindrical roller having no groove. That is, at least one of the rollers forming a pair of a top roller and a bottom roller, which is a draft roller, includes an inelastic portion made of an inelastic material and an elastic portion made of an elastic material in the circumferential direction of the circumferential surface of the roller. The rollers were provided alternately. Even if the draft roller rotates at a high speed, the air around the roller is not disturbed, so that the yarn physical properties are not deteriorated.
[0040]
In addition, in order to reliably hold and draft the sliver L, it is important that the holding force of both rollers is stable. The draft roller according to the present invention is configured such that the circumferential surface of the bottom roller 1 is formed of a metal convex portion which is an inelastic portion so as to securely grip the sliver and not to disturb the surrounding air during high-speed rotation. A grooveless cylindrical roller in which elastic portions 2 and elastic members 4 were alternately arranged.
[0041]
Further, in order to improve the gripping force, the top roller 5 is a rubber roller whose circumferential surface is made of an elastic material. Thereby, the gripping force is improved by the elastic deformation of both the surface of the top roller 5 and the elastic member 4 of the bottom roller 1.
[0042]
The ratio of the length (in the circumferential direction) is determined by taking into account the wear resistance and life of the bottom roller 1 and the life of the top roller 5 to determine the length E1 of the metal convex portion 2 and the length of the elastic portion. The shape was substantially the same as or slightly longer than E2.
[0043]
This is because when the top roller 5, which is a rubber roller, is pressed against the metal projection 2 and the elastic body 4, the top roller 5 is strongly compressed when it comes into contact with the metal projection 2 and is slightly compressed when it comes into contact with the elastic body 4. This is because when the rubber is repeatedly subjected to a load change and the rubbers come into contact with each other and rotate, the surface wear becomes severe and the roller life is shortened.
[0044]
For this purpose, the outer peripheral surface of the bottom roller 1 is formed by periodically arranging a metal convex portion 2 and an elastic member 4 having a length slightly shorter than the metal convex portion 2 in a streak shape so as to hold the sliver L to be drafted. The configuration is such that the force is maintained and the wear resistance of the roller does not decrease. Further, since a cylindrical roller having no groove is used instead of the conventional grooved roller, even if the bottom roller 1 rotates at high speed, air around the roller is not disturbed.
[0045]
The elastic material 4 is suitably a rubber material which is equal to or softer than the rubber of the top roller 5, and the bottom roller 1 of the present embodiment is formed on the groove 3 after manufacturing a metal roller having the groove 3. An appropriate rubber material is baked and adhered, and finally polished into a perfect circle to form a cylindrical roller. This manufacturing method is not particularly limited, as long as the outer surface of the metal cylindrical roller is provided with a metal portion and an elastic portion alternately in the circumferential direction.
[0046]
A pair of draft rollers composed of a bottom roller 1 and a top roller 5 have a gripping force of a conventional grooved roller by metal projections 2 which are periodically arranged, and a groove portion which is conventionally a gap portion. 3 is filled with the elastic material 4, so that this portion also has a gripping force for nipping the sliver, and it is possible to increase the gripping force of the sliver for nipping when drafting at a high speed as a whole. is there.
[0047]
Further, in addition to the above effects, even when the top roller 5 having the rubber surface is driven to rotate in contact with the bottom roller 1 for a long period of time, the repetitive fluctuation of the contact pressure is reduced, and the rise in the surface temperature of the rubber roller is suppressed. And the life of the top roller 5 can be extended.
[0048]
Further, since the bottom roller 1 has a cylindrical roller shape, there is no step, so that no noise is generated at the time of high-speed rotation, and the outer peripheral surface is hardly scratched and the life of the bottom roller 1 is reduced. Also has the effect that it can be extended.
[0049]
【The invention's effect】
As described above, according to the present invention, in the roller draft device, even when the roller is rotated at a high speed, the surrounding air is not disturbed. Further, the holding force of the fiber bundle to be drafted is maintained, and the life of the roller is not deteriorated.
[0050]
Further, it is possible to obtain a draft device including a front roller that reliably grips the sliver and does not disturb the surrounding air due to high-speed rotation.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view of a draft roller according to the present invention.
FIG. 2 is an enlarged perspective view of a draft roller according to the present invention.
FIG. 3 is an overall side view of the draft device.
FIG. 4 is an overall sectional view of a spinning machine according to the present invention.
FIG. 5 is a front view showing the entire spinning machine.
FIG. 6 is an enlarged perspective view showing a conventional draft roller provided with a groove.
[Explanation of symbols]
1 bottom roller 2 convex part (inelastic part)
3 groove part 4 elastic material (elastic part)
5 Top roller E1 Length (inelastic part)
E2 Length (elastic part)
DR Draft device Rf Front roller L Sliver M Spinning machine WR Winding unit Y Spun yarn

Claims (4)

A draft roller composed of a roller pair including a bottom roller and a top roller,
At least one of the rollers forming the roller pair is a roller that alternately includes an inelastic portion made of an inelastic material and an elastic portion made of an elastic material in a circumferential direction of a circumferential surface of the roller. Draft roller. The draft roller according to claim 1, wherein a circumferential surface of the other roller of the pair of rollers is made of an elastic material. 3. The roller according to claim 1, wherein a length of a circumferential inelastic portion of a circumferential surface of the roller in which the inelastic portions and the elastic portions are alternately arranged is longer than or approximately equal to a length of the elastic portion. 4. Draft roller. A draft device comprising a plurality of roller pairs for drawing while feeding a fiber bundle to a downstream side, wherein the draft roller according to any one of claims 1 to 3 is used as a front roller. .

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