JP2014114535A - Air spinning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air spinning device capable of minimizing the outward displacement of fibers produced by an air flow based on the rotational speed of an exit roller of a draft machine.SOLUTION: The air spinning device is for producing yarns. In the air spinning device, a sliver is drawn by using a draft machine, and then the drawn sliver is supplied to an air spinning unit for producing a twisted yarn, and the twisted yarn is withdrawn from the air spinning unit and wound up on a twill winding package. In the air spinning device, a false twisting mechanism is arranged in a pre-draft zone of the draft machine, and the false twisting mechanism provides the sliver with a twist in an alternate rotational direction, and then the sliver is drawn to a yarn count in a main-draft zone and supplied to the air spinning unit.

Description

  The present invention relates to an air spinning device for producing a yarn, in which a sliver is drawn using a draft device, and then supplied to produce yarn twist in an air spinning unit. The present invention relates to an air spinning device that is pulled out of a spinning unit and wound up in a tram roll package.

  General purpose spinning methods on the market, namely ring spinning, compression spinning, and spinning methods such as rotor spinning or open-end spinning, have almost reached their inherent limits in terms of productivity. The use of air in the inherent spinning process eliminates particularly mechanical components for imparting twist, and it is desirable to use pneumatic means instead.

  In the air spinning method, the draft is stretched to the final count with a high degree of total stretching and a high production rate. The sliver advancing from between the outlet rollers of the drafting device reaches the inlet opening of the hollow spinning spindle through the nozzle block. Upon entry of the sliver into the spinning spindle, the free fiber end is entangled around the spindle head formed in the conical shape of the spinning spindle by the rotating air flow, so-called during the drawing of the yarn into the spindle It wraps around the core fiber in a spiral. The core fibers together with so-called wound fibers form a new yarn, which is drawn out, monitored by a yarn clearer, and in some cases cleared and wound up.

  In order to be able to produce quality-spun pneumatic spun yarns, the drafting device mounted just upstream of the pneumatic spinning unit has a special meaning. In this case, there is a problem of making the fiber bundle thinner and further parallelizing the fibers. And in order to be able to spin as uniform a yarn as possible, the purpose is to produce a sliver as uniform as possible.

  A draft device is usually provided with a plurality of pairs of rollers positioned one after the other. Each of these roller pairs consists of a lower roller and an upper roller. The sliver is conveyed to the pneumatic spinning unit through a roller pair. Since the peripheral speed of the roller pair increases in the fiber traveling direction, drafting or stretching is performed thereby. When viewed in the fiber running direction, the last two roller pairs form a main draft zone, and a portion located upstream of the pair forms a pre-draft zone. Usually, a plurality of draft devices with one or two pre-draft zones are provided, and such draft devices are therefore referred to as 3-roller draft devices or 4-roller draft devices.

  Variations in quality in the sliver can no longer be adjusted downstream of the drafting device and manifest as quality variations in the yarn. In addition, even a slight adverse effect on the drafting process, for example the air flow caused by the rotational speed of the drafting device exit roller, leads the individual fibers out of the sliver and, on the contrary, partially pulls them off. Quality will be impaired. Such deterioration of the yarn quality is extremely increased as the spinning speed is increased.

  In the method for producing air-spun yarn described in Patent Document 1, flyer roving already having a slight twist is supplied to a draft device. In addition, a special arrangement of the outlet rollers of the drafting device can give a light false twist to the flyer roving in the main draft zone.

  In the spinning machine disclosed in Patent Document 2, a false twisting device including two hollow rollers is disposed on the downstream side of the spinning unit in the fiber traveling direction. In this case, the twist is applied to the yarn that has already been completely spun, so that a spun fiber yarn can be spun with a slight fluff and a firm and uniform structure.

  Patent Document 3 describes an apparatus and a method for producing a short fiber yarn having a twisted structure over the entire cross section. After the flyer roving is drawn to the final yarn count, uniform and continuous twisting is performed using a twisting mechanism. What is characteristic in this case is that a twist is applied in a negative draft zone which is arranged downstream of a known drafting device which has a positive drawing action exclusively when viewed in the fiber travel direction. The yarn produced in this way has a method typical “cork screw”. That is, this phenomenon occurs after twisting is applied. This is because some fiber groups are untwisted while other fiber groups are shrunk. In order to eliminate this, another so-called post-draft process is carried out downstream.

  Patent Document 4 discloses a spinning method that does not use a flyer and a device that includes a draft device, and can produce fine yarns and extremely thin yarns of less than 10 tex without the use of a flyer. . Usually, a thin sliver of less than 2.5 ktex is manufactured using a first draft device arranged in a preparation device of a spinning factory. The known invention for this sliver is provided with a protective twist of more than 5 twists per meter, which makes it possible for errors during transport and during withdrawal of the sliver to be drawn into the second drafting device or pneumatic spinning unit. It is possible to prevent the occurrence of drafts.

The prior art devices and methods described above have been found to have the following disadvantages:
In the mutual arrangement form of the exit rollers described in Patent Document 1, the exit roller pair is worn out very early. Furthermore, with this known arrangement, only a uniform twist can be provided. According to Patent Literature 2 and Patent Literature 3, twisting is added only after the sliver has already been drawn to the final yarn count. And this does not solve the problem of fibers jumping out of the sliver and partially dissociated fibers to a satisfactory level.

DE102005022186A1 DE19526048A1 DE2042387A1 EP1853755B1

  It is therefore an object of the present invention to provide a device which minimizes the outward displacement of the fibers caused by the air flow, in particular based on the rotational speed of the draft device exit roller.

  According to the present invention, according to the present invention, the false twisting mechanism is arranged in the predraft zone of the draft device according to the configuration described in the characterizing portion of claim 1, and the false twisting mechanism is in the alternating rotation direction. A twist is applied to the sliver, after which the sliver is drawn to the desired yarn count in the main draft zone and is solved by a configuration fed to the pneumatic spinning unit.

  Further preferred embodiments of the invention are described in the dependent claims.

  When configured in accordance with the present invention, the rotational direction or twist direction always alternates (inverts), resulting in partly the twist entering the main draft zone and the desired improvement. It is done. Twisting makes the sliver more compact and the edge fibers are integrated into the center together. This avoids the individual fibers being guided out of the sliver by the air flow in front of the nip gap of the exit roller pair. As a result, the yarn uniformity is improved.

  In a preferred aspect of the present invention, the draft device on the upstream side of the spinning unit is a four-roller draft device. The more precise the desired uniformity and thus the parallel position of the fibers, the more draft zones will have. In this way, the sliver is further stepped and stretched.

  In the aspect described in claim 3, the false twisting mechanism is disposed in the second pre-draft zone. Such an arrangement provides the following advantages. That is, in this case, since the sliver is already thinned by the first draft zone, more twists can be added, in which case the twist is limited only by the fact that strong stretching in the main draft zone is not hindered. Absent. The object of the invention to “capture and incorporate” edge fibers is already achieved with a small number of twists.

  In a preferred aspect of the present invention, the false twisting mechanism is a rotating tube. The rotating tube continuously changes to the left rotation and the right rotation around its longitudinal axis, thus transmitting the alternating rotation to the sliver and adding twist.

  In the aspect of Claim 5, a false twist mechanism is a nozzle supplied with air. Due to the corresponding arrangement of the air nozzles in the passage and the supply of air to the air nozzles, the sliver is also provided with alternating rotations or twists about its longitudinal axis, even with such a configuration. In an embodiment, mechanically moving parts are avoided.

  The present invention is not limited to a specific false twist mechanism.

It is a front view showing a textile machine provided with an air spinning device. FIG. 2 is a simplified cross-sectional view showing a spinning device of one spinning section of the pneumatic spinning machine shown in FIG. 1.

  Next, an embodiment of the present invention will be described with reference to a simplified working unit of a pneumatic spinning machine shown in the drawings.

  FIG. 1 shows a pneumatic spinning machine 1 in a front view. This textile machine has a number of working parts or spinning parts 2 arranged side by side in a row, and these working parts 2 are so-called end frames 15, 16 arranged on the end side. Is positioned between.

  As further shown in FIG. 1, each working unit 2 includes a sliver 4 stored in a supply material, for example, a spinning can 3.

  Further, the working unit 2 includes a draft device 5, an air spinning unit 6, a yarn drawing device 7, a yarn clearer 8, and a winding device.

  The associated yarn traversing device 9 serves to wind the yarn 10 manufactured from the sliver 4 in the pneumatic spinning unit 6 onto the winding package 11 in a traversed state.

  The winding package or the traverse winding package 11 is normally held by a package frame (not shown) and is rotated by a package driving device (not shown).

  As further shown in FIG. 1, the working part 2 of the textile machine 1 is preferably managed by an automatically operated operating unit 12, which is guided on rails 13,14. The vehicle can travel along the working unit 2.

  In FIG. 2, the draft device 5 is shown together with the passing state of the air spinning unit 6 and the sliver 4 installed later. The sliver 4 drawn out from the spinning can 3 is drawn in by an upper roller 31 and a lower roller 32 arranged as a drawing roller pair, and is drawn using the upper rollers 33, 35, 39 and the lower rollers 34, 36, 40. Is done.

  The upper roller 35 and the lower roller 36 cooperate with the apron belts 37 and 38. The upper roller 39 and the lower roller 40 are arranged as exit rollers. According to the present invention, a false twist mechanism 41 is arranged downstream of the upper roller 33 and the lower roller 34.

  A nozzle device 42 is arranged on the inlet side of the spinning unit 6. The nozzles 43 and 44 are connected to a compressed air source 46 through a pipe line 45. The air flowing out from the nozzles 43 and 44 generates a rotating flow, and this rotating flow is applied to the stretched sliver 4. A hollow spinning cone 47 is connected to the nozzles 43 and 44. The yarn 10 formed by the cooperation of the nozzle device 42 and the spinning cone 47 is drawn out from the spinning unit 6 through the hollow spinning cone 47. The air chamber 48 surrounding the spinning cone 47 is connected to the negative pressure source 50 using another pipe line 49. Further details of the spinning process using such a spinning device are disclosed, for example, in DE 199 26 492 A1.

  The sliver 4 is conveyed to the pneumatic spinning unit 6 by the roller pairs 31, 32; 33, 34; 35, 36; 39, 40. In this case, the peripheral speed of the roller pair increases in the sliver traveling direction. In the first pre-draft zone 51, the sliver 2 is stretched up to 4 times. In the second predraft zone 52, the sliver 4 is further stretched and then further twisted in different directions by the false twist mechanism 41. In the main draft zone 53, the sliver 4 has a final fineness corresponding to a yarn count (Garnfeinheit). The upper roller 39 and the lower roller 40 arranged as outlet rollers guide the air flow directed to the triangular space 54. This air flow cannot pass through the nip point between the upper roller 39 and the lower roller 40, and therefore flows to the side of the upper roller 39 and the lower roller 40.

  The pre-drafted sliver 4 reaching into the main draft zone 53 has, according to the invention, alternately twisted (wechselnde Drehung). As a result, the fiber / fiber fixing (Faser-Faser-Haftung) remains, and as a result, the tensile force in the sliver 4 remains large enough to be blown to the side of the upper roller 39 and the lower roller 40 by air. A slight number of fibers can be kept. This also feeds these fibers into the spinning process, resulting in quality-priced, air spun yarns with little fuzz and improved uniformity.

  DESCRIPTION OF SYMBOLS 1 Air spinning machine (textile machine), 2 Spinning part (working part), 5 Draft device, 6 Air spinning unit, 7 Yarn drawing device, 8 Yarn clearer, 9 Yarn traverse device, 10 Yarn, 11 Winding package (Twill) Winding package), 12 operation unit, 13, 14 rail, 15, 16 end frame, 31, 33, 35, 39 upper roller, 32, 34, 36, 40 lower roller, 37, 38 apron belt, 41 false twist Mechanism, 42 nozzle device, 43,44 nozzle, 45 pipe, 46 compressed air source, 47 spinning cone, 48 air chamber, 49 pipe, 50 negative pressure source, 51 first predraft zone, 52 second pre Draft zone, 53 Main draft zone, 54 Triangular space

Claims (5)

An air spinning device for producing a yarn, wherein the sliver is drawn using a draft device and then supplied to the air spinning unit to cause yarn twisting and drawn from the air spinning unit. In the pneumatic spinning device that is wound up in the Ayanaki package,
A false twisting mechanism is arranged in the pre-draft zone of the draft device, the false twisting mechanism twists the sliver in an alternating rotational direction, and then the sliver is stretched to the yarn count in the main draft zone. The pneumatic spinning device is supplied to the pneumatic spinning unit.   The pneumatic spinning device according to claim 1, wherein the draft device on the upstream side of the spinning unit is a four-roller draft device.   The pneumatic spinning device according to claim 2, wherein the false twisting mechanism is disposed in a second pre-draft zone.   The pneumatic spinning device according to claim 3, wherein the false twisting mechanism is a rotary tube.   The pneumatic spinning device according to claim 3, wherein the false twisting mechanism is a nozzle supplied with air.

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