EP1826299A2 - Spinning device and spinning method - Google Patents
Spinning device and spinning method Download PDFInfo
- Publication number
- EP1826299A2 EP1826299A2 EP07001986A EP07001986A EP1826299A2 EP 1826299 A2 EP1826299 A2 EP 1826299A2 EP 07001986 A EP07001986 A EP 07001986A EP 07001986 A EP07001986 A EP 07001986A EP 1826299 A2 EP1826299 A2 EP 1826299A2
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- EP
- European Patent Office
- Prior art keywords
- air
- yarn
- whirling
- nozzle
- air current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000009987 spinning Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims description 8
- 239000000835 fiber Substances 0.000 claims abstract description 119
- 238000004804 winding Methods 0.000 description 24
- 238000007599 discharging Methods 0.000 description 22
- 230000007547 defect Effects 0.000 description 9
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 238000004891 communication Methods 0.000 description 8
- 230000008901 benefit Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007378 ring spinning Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
- D01H4/02—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques imparting twist by a fluid, e.g. air vortex
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H1/00—Spinning or twisting machines in which the product is wound-up continuously
- D01H1/11—Spinning by false-twisting
- D01H1/115—Spinning by false-twisting using pneumatic means
Definitions
- the spinning device comprises a hollow guide shaft having a yarn path formed therein and an air nozzle that generates a whirling air current in a space at an inlet of the yarn path.
- a fiber bundle is fed out toward the yarn path, and the air nozzle is driven (to inject air), and a whirling air current is generated by the air nozzle to separate outer fibers (winding fibers) of the fiber bundle from some fibers left in the center of the bundle (core fibers).
- the winding fibers then whirl outside the hollow guide shaft and wind around the core fibers to generate a fasciated spun yarn.
- the spun yarn 9 is additionally twisted in order to enhance the entanglement of the winding fibers 6a with the core fibers to increase the strength of the spun yarn 9.
- the second nozzle holes 13a, 13a, ... configured as shown in Figure 5 generate a counterclockwise whirling air current B2 in the yarn path 13b.
- the yarn discharging step is executed by injecting air through the first air nozzle 16 and the auxiliary nozzle 19 at the above state (the end of the fiber bundle 6 lies in the neighborhood of the inlet of the fiber introducing path 11a).
- the air injection through the first air nozzle 16 and the auxiliary nozzle 19 sucks the external air into the fiber introducing path 11a, while the fiber bundle 6 is drawn into the fiber introducing path 11a and then guided into the inversion chamber 14.
Abstract
Description
- The present invention relates to a spinning device comprising a hollow guide shaft having a yarn path formed therein through which a spun yarn is guided, a first air nozzle that generates a whirling air current in a space at an inlet of the yarn path, and a second air nozzle that generates an air current in the middle of the yarn path, as well as a spinning method using the spinning device.
- A known pneumatic spinning device carries out spinning by exposing a fiber bundle to a whirling air current.
- The spinning device comprises a hollow guide shaft having a yarn path formed therein and an air nozzle that generates a whirling air current in a space at an inlet of the yarn path. A fiber bundle is fed out toward the yarn path, and the air nozzle is driven (to inject air), and a whirling air current is generated by the air nozzle to separate outer fibers (winding fibers) of the fiber bundle from some fibers left in the center of the bundle (core fibers). The winding fibers then whirl outside the hollow guide shaft and wind around the core fibers to generate a fasciated spun yarn.
- An example of these spinning devices is disclosed in the Unexamined
Japanese Patent Application Publication (Tokkai) No. 2003-155630 - The spinning device disclosed in the Unexamined
Japanese Patent Application Publication (Tokkai) No. 2003-155630 - In the pneumatic spinning, a whirling air current generated by the air nozzle separates outer fibers (winding fibers) of the fiber bundle from some fibers left in the center of the bundle(core fibers). However, the separated fibers may be discharged from the spinning device without winding around the core fibers. That is, part of the fiber bundle, the material of spun yarns, becomes a fiber loss.
- A cause of the fiber loss is that the whirling air current forms an air current flowing backward from the inside to the inlet of the yarn path. Thus, the fibers in a fiber bundle supplied by a draft section are not caught in a spun yarn being generated. That is, the backward flowing air current may hinder the spinning.
- That is, an object of the present invention is to reduce a fiber loss that may occur during spinning carried out by a pneumatic spinning device.
- A description has been given of the problems to be solved by the present invention. Now, the description will be given of means for solving the problems.
- According to Claim 1, there is provided a spinning device comprising:
- a hollow guide shaft having a yarn path formed in an axial position and through which a spun yarn is fed out;
- a first air nozzle that generates a whirling air current to which a fiber bundle is exposed, in a space at an inlet of the yarn path; and
- a second air nozzle that generates an air current having a yarn feed-out direction component acting along the yarn path, in the middle of the yarn path.
- This configuration has the following advantage.
- The whirling air current generated by the first air nozzle separates the outer fibers of the fiber bundle, and the outer fibers wind around the core fibers in the center of the fiber bundle to generate a spun yarn.
- Then, an axial air current generated by the second air nozzle sucks air from the inlet to the inside of the yarn path. This allows the separated outer fibers to be readily drawn into the yarn path.
- In the spinning device according to Claim 2, the air current generated by the second air nozzle is a whirling air current having not only the yarn feed-out direction component but also a whirling direction component acting around the yarn feed-out direction , and
a whirling direction of the whirling air current from the first air nozzle is set the same as a whirling direction of the whirling air current from the second air nozzle. - This arrangement has the following advantage.
- The first air nozzle and second air nozzle generate a whirling air current in the same whirling direction. This allows the spun yarn to be additionally twisted.
- According to
Claim 3, there is provided a spinning method using a spinning device according to Claim 1 or Claim 2, wherein spinning is carried out by continuously injecting air both from the first air nozzle and from the second air nozzle. - This configuration allows an operation similar to that in Claim 1 or Claim 2 to continue during spinning.
- The present invention exerts the following effects.
- According to Claim 1, the outer fibers separated by the whirling air current generated by the first air nozzle are readily drawn into the yarn path. This reduces a possible fiber loss.
- According to Claim 2, the spun yarn is additionally twisted to increase its strength.
- According to
Claim 3, an effect similar to that of Claim I or Claim 2 can be continuously produced during spinning. - Other features, elements, processes, steps, characteristics and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the present invention with reference to the attached drawings.
-
- Figure 1 is a perspective view showing the configuration of a pneumatic spinning machine.
- Figure 2 is a vertical sectional view of a spinning device.
- Figure 3 is a horizontal sectional view of periphery of a first air nozzle in the spinning device.
- Figure 4 is a horizontal sectional view of periphery of a yarn discharging air nozzle in the spinning device.
- Figure 5 is a horizontal sectional view of periphery of a second air nozzle in the spinning device.
- An embodiment of the present invention will be described with reference to the drawings.
- A spinning
machine 3 will be described with reference to Figure 1. - The spinning
machine 3 is an apparatus that blows a whirling air current against a fiber bundle (sliver) 6 to manufacture a spunyarn 9. - The spinning
machine 3 has acan 5 which is placed at the most upstream position, adraft device 7, aspinning device 10, ayarn feeding device 20, a yarndefect detecting device 30, and a windingdevice 40 which are sequentially arranged along a path (hereinafter referred to as a yarn feeding path) along which the spunyarn 9 is manufactured from thefiber bundle 6. - The can (sliver container) 5 accommodates the
fiber bundle 6 generated by a drawing frame. - In Figure 1, the spinning
machine 3 is one unit of apparatus that manufactures a spunyarn 9. However, a plurality of the apparatuses arranged in a line, each of which manufactures a spu yarn, may be called a spinning machine as a whole. - The
draft device 7 comprises four pairs of draft rollers that draft the fiber bundle between the rollers. The four pairs of draft rollers include aback roller pair 71, athird roller pair 72, asecond roller pair 73, and afront roller pair 74 which are arranged along the direction in which thefiber bundle 6 is conveyed. - The
spinning device 10 manufactures a spun yarn (fasciated spun yarn) 9 by allowing a whirling air current to act on thefiber bundle 6. - The spinning
machine 3 in accordance with the present embodiment has a spinning speed of 300 to 400 m/min, which is about 20 times as high as that of a ring spinning machine (20 to 30 m/min); the spinningmachine 3 is able to achieve high-speed spinning. - The
yarn feeding device 20 feeds the spunyarn 9 manufactured by thespinning device 10 out to the windingdevice 40. Theyarn feeding device 20 comprises adelivery roller 21 and anip roller 22 which nip and feed out the spunyarn 9. - The yarn
defect detecting device 30 detects a yarn defect in the spunyarn 9 being fed to the windingdevice 40. On the basis of yarn defect detection information from the yarndefect detecting device 30, the yarn defect portion is removed to prevent an improper yarn from being wound into apackage 4. The yarndefect detecting device 30 comprises a cutting device (not shown in the drawings) that cuts thespun yarn 9 in response to the detection of a yarn defect. - To cut away yarn defect portion, the spinning
machine 3 also comprises yarn splicing means (not shown in the drawings) for splicing both ends of the cut spunyarn 9 together. - The winding
device 40 transversally winds the spunyarn 9 manufactured by thespinning device 10 in an axial direction of a bobbin to form apackage 4. - The configuration of the
spinning device 10 will be described with reference to Figure 2. - The
spinning device 10 has a needle block 11, anozzle block 12, and ahollow guide shaft 13 arranged along a yarn feed-out direction (the direction in which thefiber bundle 6 and spunyarn 9 are fed out) A. The yarn feed-out direction A corresponds to a direction from the top to bottom of Figure 2. - The
spinning device 10 internally has afiber introducing path 11a, an i nvers i onchamber 14, a whirling aircurrent generating chamber 15, and ayarn path 13b through all of which thefiber bundle 6 or spunyarn 9 pass or move. Thefiber introducing path 11a, whirling aircurrent generating chamber 15, andyarn path 13b are independent of one another but are in communication with one another via theinversion chamber 14. - The
spinning device 10 also comprises afirst air nozzle 16 which injects air into theinversion chamber 14, and anauxiliary nozzle 19 and asecond air nozzle 17 which inject air into theyarn path 13b. - In summary, first, the
fiber bundle 6 is introduced into theinversion chamber 14 via thefiber introducing path 11a. Thefiber bundle 6 introduced in theinversion chamber 14 is unbundled and then twisted by a whirling air current B1 generated in the whirling aircurrent generating chamber 15 by air injected by thefirst air nozzle 16. This results in a spunyarn 9 at the tip of aneedle 18 in theinversion chamber 14. The spunyarn 9 is fed out of thespinning device 10 via theyarn path 13b. - The needle block 11 is a member that supports the
needle 18 which guides the fibers in theinversion chamber 14. Theneedle 18 advances into theinversion chamber 14 and projects toward theyarn path 13b. The position at which theneedle 18 is fixed is adjustable, and the amount of projection of theneedle 18 toward theyarn path 13b can be changed. - The needle block 11 has the
fiber introducing path 11a formed therein. - The
hollow guide shaft 13 is a member constituting a path (yarn path 13b) through which the spunyarn 9 is passed, and thehollow guide shaft 13 also guides whirling movement of whirling fibers (windingfibers 6a described below) separated from thefiber bundle 6 by the whirling air current B1. - The
hollow guide shaft 13 is cylindrical and has an inner wall surface forming theyarn path 13b and an outer wall surface forming a guide surface for the windingfibers 6a. The axial direction of thehollow guide shaft 13 aligns with the yarn feed-out direction A, and thehollow guide shaft 13 is symmetric with respect to its axis, and theyarn path 13b is located at the axial position. - The
inversion chamber 14 is a columnar space, and wall surfaces of two opposite members, the needle block 11 andhollow guide shaft 13, correspond to the opposite bottom surfaces of the columnar space, and an inner wall surface of thenozzle block 12 corresponds to a side surface of the columnar space. An inlet of theyarn path 13b is open into theinversion chamber 14. Accordingly, theinversion chamber 14 constitutes an inlet side space of theyarn path 13b. - The whirling air
current generating chamber 15 is a space shaped like a truncated cone and a cylinder. The outer wall surface of thehollow guide shaft 13 corresponds to an inner surface of the cylinder. The inner wall surface of thenozzle block 12 corresponds to an outer wall surface of the cylinder. - The
first air nozzle 16, shown in Figures 2 and 3, will be described below. - The
spinning device 10 comprises thefirst air nozzle 16 as means for generating a whirling air current B1 in the inversion chamber 14 (the space at an inlet of theyarn path 13b) and whirling aircurrent generating chamber 15. In the present embodiment, thefirst air nozzle 16 forms a part of thenozzle block 12 and is composed offirst nozzle holes nozzle block 12 and peripheries of thefirst nozzle holes first nozzle holes 12a is in communication with the whirling aircurrent generating chamber 15. - Air is fed through the
first nozzle holes inversion chamber 14. - As shown in Figure 3, each of the
first nozzle holes 12a is formed to communicate with the inside of the whirling aircurrent generating chamber 15 from a tangential direction of the whirling aircurrent generating chamber 15, which is a cylindrical space. Thus, air ejected from thefirst nozzle holes 12a generates a whirling air current B1 in theinversion chamber 14 and whirling air current generating chamber 15 (particularly the whirling air current generating chamber 15). In particular, the plurality of thefirst nozzle holes current generating chamber 15, which is a cylindrical space. Further, air is uniformly injected through all of thefirst nozzle holes inversion chamber 14 and the whirling aircurrent generating chamber 15. - With the
first nozzle holes inversion chamber 14 and the whirling aircurrent generating chamber 15 whirls counterclockwise around the axis extending in the yarn feed-out direction A. - Each of the
first nozzle holes 12a is formed generally perpendicularly to the yarn feed-out direction A, and more specifically, thefirst nozzle holes 12a are inclined toward the yarn feed-out direction A side. Thus, the flow of air ejected from thefirst nozzle holes 12a is provided not only with the whirling component acting around the axis extending in the yarn feed-out direction A but also with a component acting toward the yarn feed-out direction A. - The whirling air current B1 generated by the
first air nozzle 16 is thus provided with the component acting toward the yarn feed-out direction A. This allows the external air to be sucked through thefiber introducing path 11a, allowing thefiber bundle 6 to be easily introduced into theinversion chamber 14. - Spinning is carried out as follows.
- The
fiber bundle 6 is introduced into theinversion chamber 14. The whirling air current B1 generated in theinversion chamber 14 and the whirling aircurrent generating chamber 15 separates outer fibers (hereinafter referred to as windingfibers 6a) from the introducedfiber bundle 6, with some fibers (hereinafter referred to as core fibers) left in the center of the bundle. The whirling air current B1 generated in theinversion chamber 14 and the whirling aircurrent generating chamber 15 flows in the yarn feed-out direction A. The windingfibers 6a whirl while being drawn into the whirling aircurrent generating chamber 15, and wind around the core fibers. The windingfibers 6a are entangled with the core fibers to generate a fasciated spunyarn 9. - Now, the
auxiliary nozzle 19, shown in Figures 2 and 4, will be described. - The
auxiliary nozzle 19 is means for enabling thespinning device 10 to first discharge a spun yarn (newly introducing thefiber bundle 6 into thespinning device 10 to start generating a spun yarn 9). - Once spinning is started to get the
spinning device 10 ready to deliver the spunyarn 9, thefiber bundle 6 can be sequentially formed into a spunyarn 9 simply by actuating thefirst air nozzle 16. - At time of yarn discharging, the
auxiliary nozzle 19 generates a negative pressure that allows thefiber bundle 6 to be introduced into theyarn path 13b and a whirling air current B3 that flows in a direction opposite to that of the whirling air current B1 generated by thefirst air nozzle 16. Then, when thecore fibers 6 already twisted by theauxiliary nozzle 19 are untwisted downstream side of theauxiliary nozzle 19, the direction in which the core fibers are untwisted is the same as that in which windingfibers 6a wound around the core fibers have been twisted. This allows the windingfibers 6a to wind firmly around the core fibers to generate a kind of yarn before generating a spunyarn 9. - The
auxiliary nozzle 19 generates an air current (whirling air current B3) in theyarn path 13b, and the air current has the component (1) acting in the yarn feed-out direction A and the component (2) acting around the axis extending in the yarn feed-out direction A. - The component (1) acting in the yarn feed-out direction A makes the air pressure in the
yarn path 13b negative with respect to the air pressure in theinversion chamber 14. The component (2) acting around the axis extending in the yarn feed-out direction A twists the core fibers in the direction opposite to that in which the windingfibers 6a whirl. - As shown in Figure 2, in accordance with the present embodiment, the
auxiliary nozzle 19 forms a part of thehollow guide shaft 13, and is composed of yarn dischargingnozzle holes nozzle holes nozzle holes 13c are in communication with the inside of theyarn path 13b in the middle of theyarn path 13b. - Air is fed through the yarn discharging
nozzle holes yarn path 13b. - The
auxiliary nozzle 19 is different from thefirst air nozzle 16 in the place to which air is ejected and in the place in which a whirling air current is generated. - On the other hand, the
auxiliary nozzle 19 is the same as thefirst air nozzle 16 in the following points: the nozzle holes are arranged around the axis of the yarn feed-out direction A at equal intervals, the direction in which air is ejected from the nozzle holes is the same as that in which a whirling air current is generated, and the whirling air current is provided with the component acting in the yarn feed-out direction A. However, the whirling direction of the whirling air current B3, generated by theauxiliary nozzle 19, is opposite to that of the whirling air current B1 generated by thefirst air nozzle 16. - Each of the yarn discharging
nozzle holes 13c is formed generally perpendicularly to the yarn feed-out direction A, and more specifically, the yarn dischargingnozzle holes 13c are inclined toward the yarn feed-out direction A side. The yarn dischargingnozzle holes 13c correspond to areas that are immediately adjacent to and in communication with theyarn path 13b (the peripheries of the openings in communication with theyarn path 13b). The direction in which the yarn dischargingnozzle holes 13c are formed allows the flow of air ejected from the yarn dischargingnozzle holes 13c to be provided with the component acting toward the yarn feed-out direction A. - As shown in Figure 4, each of the yarn discharging
nozzle holes 13c is formed to communicate with the inside of theyarn path 13b, which is a cylindrical space, from a tangential direction of theyarn path 13b. Thus, air ejected from each of the yarn dischargingnozzle holes 13c generates a whirling air current B3 in theyarn path 13b. The whirling air current B3 has not only the component acting in the yarn feed-out direction A but also the component acting around the axis extending in the yarn feed-out direction A. However, the whirling air current B3 flows in the direction opposite to that in which the whirling air current B1 flows. - In particular, the plurality of yarn discharging
nozzle holes 13c. 13c, ... are spaced at equal intervals in the circumferential direction of theyarn path 13b, which i$ a cylindrical space, and further, air is uniformly injected through all of the yarn dischargingnozzle holes yarn path 13b. - The yarn discharging
nozzle holes yarn path 13b. - Now, the
second nozzle hole 17, shown in Figures 2 and 5, will be described. - The
second air nozzle 17 is means for allowing the spunyarn 9 to be more efficiently generated. Specifically, thesecond air nozzle 17 generates an air current (whirling air current B2) in theyarn path 13b; the air current has the component (1) acting in the yarn feed-out direction A and the component (2) acting around the axis extending in the yarn feed-out direction A. - The component (1) acting in the yarn feed-out direction A makes the air pressure in the
yarn path 13b negative with respect to the air pressure in theinversion chamber 14. The component (2) acting around the axis extending in the yarn feed-out direction A additionally twists the spunyarn 9. - First, the air pressure in the
yarn path 13b is set negative with respect to the air pressure in theinversion chamber 14 because the air injected by thefirst air nozzle 16 makes the air pressure in theyarn path 13b positive with respect to the air pressure in the inversion chamber 14 (the air flows from theyarn path 13b to the inversion chamber 14). This is because the high pressure of air ejected from the whirling aircurrent generating chamber 15 side to the outside causes air to be sucked from the center toward outer periphery of theinversion chamber 14. As a result, some of the windingfibers 6a are discharged from the whirling aircurrent generating chamber 15 side directly to the outside without being entangled with the core fibers. This unfortunately leads to a fiber loss. - Second, the spun
yarn 9 is additionally twisted in order to enhance the entanglement of the windingfibers 6a with the core fibers to increase the strength of the spunyarn 9. - As shown in Figure 2, in accordance with the present embodiment, the
second nozzle 17 forms a part of thehollow guide shaft 13, and is composed ofsecond nozzle holes second nozzle holes second nozzle holes 13a is in communication with the inside of theyarn path 13b in the middle of theyarn path 13b. - Air is fed through the
second nozzle holes yarn path 13b. - The
second air nozzle 17 is different from thefirst air nozzle 16 in the place to which air is ejected and in the place in which a whirling air current is generated. - 0n the other hand, the
second air nozzle 17 is the same as thefirst air nozzle 16 in the following points: the nozzle holes are arranged around the axis of the yarn feed-out direction A at equal intervals, the direction in which air is ejected from each of the nozzle holes is the same as that in which a whirling air current is generated, and the whirling air current is provided with the component acting in the yarn feed-out direction A. Further, thesecond air nozzle 17 is the same as thefirst air nozzle 16 in the whirling direction of the whirling air current. - Each of the
second nozzle holes 13a is formed generally perpendicularly to the yarn feed-out direction A, and more specifically, thesecond nozzle holes 13a are inclined toward the yarn feed-out direction A side. Thesecond nozzle holes 13a correspond to areas that are immediately adjacent to and in communication with theyarn path 13b (the peripheries of the openings in communication with theyarn path 13b). The direction in which thesecond nozzle holes 13a are formed allows the flow of air ejected from each of thesecond nozzle holes 13a to be provided with the component acting toward the yarn feed-out direction A. - As previously described, air injected by the
first air nozzle 16 makes the air pressure in theyarn path 13b positive with respect to the air pressure in theinversion chamber 14. However, on the contrary, air injected from thesecond nozzle holes 13a makes the air pressure in theyarn path 13b negative with respect to the air pressure in theinversion chamber 14. This prevents the windingfibers 6a from being discharged from the whirling aircurrent generating chamber 15 directly to the outside without being entangled with the core fibers. This in turn further reduces a possible fiber loss. - As shown in Figure 5, each of the
second nozzle holes 13a is formed to communicate with the inside of theyarn path 13b, which is a cylindrical space, from a tangential direction of theyarn path 13b. Thus, air ejected from each of thesecond nozzle holes 13a generates a whirling air current B2 in theyarn path 13b. The whirling air current B2 has not only the component acting in the yarn feed-out direction A but also the component acting around the axis extending in the yarn feed-out direction A. - In particular, the plurality of
second nozzle holes yarn path 13b, which is a cylindrical space, and further, air is uniformly injected through all of thesecond nozzle holes yarn path 13b. - The
second nozzle holes yarn path 13b. - As shown in Figures 3 and 5, the
second air nozzle 17 is the same as thefirst air nozzle 16 in the whirling direction of the whirling air current. - Thus, the spun
yarn 9 twisted in theinversion chamber 14 by air injected through thefirst air nozzle 16 is twisted again (additionally twisted) in theyarn path 13b by air injected through thesecond air nozzle 17. This further enhances the entanglement of the windingfibers 6a with the core fibers to increase the strength of the spunyarn 9. - Now, a description will be given of a spinning method using the
spinning device 10. - The spinning method comprises an introducing step of introducing a
fiber bundle 6 into thespinning device 10, a yarn discharging step of injecting air through thefirst air nozzle 16 and theauxiliary nozzle 19, and a spinning step of injecting air through thefirst air nozzle 16 and thesecond air nozzle 17. - In the introducing step, an operator or the like carries the end of the
fiber bundle 6 to the neighborhood of an inlet of thefiber introducing path 11a (or into thefiber introducing path 11a). - The yarn discharging step is executed by injecting air through the
first air nozzle 16 and theauxiliary nozzle 19 at the above state (the end of thefiber bundle 6 lies in the neighborhood of the inlet of thefiber introducing path 11a). The air injection through thefirst air nozzle 16 and theauxiliary nozzle 19 sucks the external air into thefiber introducing path 11a, while thefiber bundle 6 is drawn into thefiber introducing path 11a and then guided into theinversion chamber 14. The air is sucked into thefiber introducing path 11a because the air injection through thefirst air nozzle 16 and theauxiliary nozzle 19 makes the air pressure in theinversion chamber 14 and theyarn path 13b negative with respect to the air pressure in thefiber introducing path 11a, with a resultant air flow that sucks the external air into thefiber introducing path 11a. The direction of the whirling air current B1 generated by thefirst air nozzle 16 is opposite to that of the whirling air current B3 generated by theauxiliary nozzle 19. - The
fiber bundle 6 is introduced into theyarn path 13b via theinversion chamber 14. Theauxiliary nozzle 19 then twists thefiber bundle 6 between theauxiliary nozzle 19 and theneedle 18. Thefiber bundle 6 is thus converged as the core fibers. On the other hand, the remaining fibers (windingfibers 6a), which are not twisted and thus do not constitute the core fibers of thefiber bundle 6, wind around the core fibers by the whirling air current B1 generated by thefirst air nozzle 16 in the direction of the whirling air current B1. The core fibers are twisted by theauxiliary nozzle 19 and start to be untwisted upon having passed through theauxiliary nozzle 19. The untwisting occurs in the direction opposite to that of the whirling air current B3, generated by theauxiliary nozzle 19, that is, in the same direction as that of the whirling air current B1, generated by thefirst air nozzle 16. Thus, the untwisting of the core fibers allows the windingfibers 6a to wind more firmly around the core fibers. Then, the windingfibers 6a wind around the non-twisted core fibers by untwisting to generate a kind of yarn. - Once the kind of yarn is generated and discharged from the
yarn path 13b, the air injection through theauxiliary nozzle 19 is stopped to end the yarn discharging step. The process then shifts to a normal spinning step. - In the spinning step, air injection is started through the
second air nozzle 17; air is injected through both thefirst air nozzle 16 and thesecond air nozzle 17. Thefiber bundle 6 is guided to theinversion chamber 14, where it is spun as previously described. The spunyarn 9 is then fed out to the outside of thespinning device 10 via theyarn path 13b. The kind of yarn generated in the yarn discharging step is cut during an operation of the yarn splicing means (not shown in the drawings). - A stop step is executed to suspend or end spinning. In this case, the air injection through the
first air nozzle 16 and thesecond air nozzle 17 is ended. - The spinning step is executed while spinning is being continued. During the execution of the spinning step, air is continuously injected through both the
first air nozzle 16 and thesecond air nozzle 17. - Thus, first, the air injection through the
first air nozzle 16 generates, in theyarn path 13b, an air flow moving in the direction opposite to the yarn feed-out direction A. However, the air injection through thesecond air nozzle 17 generates an air flow which cancels the above air flow and which moves in the opposite direction (that is, the yarn feed-out direction A). During the execution of the spinning operation, an air flow moving in the yarn feed-out direction A is continuously generated in theyarn path 13b. This prevents the windingfibers 6a from being disadvantageously discharged from the whirling aircurrent generating chamber 15 to the outside. This in turn reduces a possible fiber loss. - The direction of an air flow generated in the
yarn path 13b is not fixedly determined by the largeness or smallness of the pressure of the injection through the thefirst air nozzle 16 and thesecond air nozzle 17. The direction of the air flow is determined by a set of factors such as the opening areas of thenozzle holes inversion chamber 14 and whirling aircurrent generating chamber 15. - Second, the spun
yarn 9 already twisted by thefirst air nozzle 16 is twisted again in the same direction by thesecond air nozzle 17, located downstream side of thefirst air nozzle 16 in the yarn feed-out direction A. During the execution of a spinning operation, the spunyarn 9 is continuously additionally twisted. This increases the intensity of the spunyarn 9. - The reduction in fiber loss and the increase in the strength of the spun
yarn 9 described above can be achieved by air injection through both thefirst air nozzle 16 and thesecond air nozzle 17 on the condition that the amount of air injected (the amount of air injected during a unit time) only through thefirst air nozzle 16 is the same as the total amount of air injected (the amount of air injected during a unit time) through both thefirst air nozzle 16 and thesecond air nozzle 17. Conversely, with the amount of fiber loss and the strength of the spunyarn 9 kept unchanged, the amount of air injected can be reduced by injecting air through both thefirst air nozzle 16 and thesecond air nozzle 17 instead of injecting air only through thefirst air nozzle 16. - While the present invention has been described with respect to preferred embodiments thereof, it will be apparent to those skilled in the art that the disclosed invention may be modified in numerous ways and may assume many embodiments other than those specifically set out and described above. Accordingly, it is intented by the appended claims to cover all modifications of the present invention that fall within the true spirit and scope of the invention.
Claims (3)
- A spinning device characterized by comprising:a hollow guide shaft having a yarn path formed in an axial position and through which a spun yarn is fed out;a first air nozzle that generates a whirling air current to which a fiber bundle is exposed, in a space at an inlet of the yarn path; anda second air nozzle that generates an air current having a yarn feed-out direction component acting along the yarn path, in the middle of the yarn path.
- A spinning device according to Claim 1, characterized in that the air current generated by the second air nozzle is a whirling air current having not only said yarn feed-out direction component but also a whirling direction component acting around the yarn feed-out direction , and
a whirling direction of the whirling air current from said first air nozzle is set the same as a whirling direction of the whirling air current from the second air nozzle. - A spinning method using a spinning device according to Claim 1 or Claim 2, characterized in that spinning is carried out by continuously injecting air both from the first air nozzle and from the second air nozzle.
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JP2006052677 | 2006-02-28 | ||
JP2006285492A JP2007262645A (en) | 2006-02-28 | 2006-10-19 | Spinning device and spinning method |
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EP1826299A2 true EP1826299A2 (en) | 2007-08-29 |
EP1826299A3 EP1826299A3 (en) | 2009-12-23 |
EP1826299B1 EP1826299B1 (en) | 2013-10-02 |
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EP20070001986 Active EP1826299B1 (en) | 2006-02-28 | 2007-01-30 | Spinning device |
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EP1826299A3 (en) | 2009-12-23 |
EP1826299B1 (en) | 2013-10-02 |
JP2007262645A (en) | 2007-10-11 |
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