JPS6021918A - Method and apparatus for double-twist spinning - Google Patents

Abstract

PURPOSE:To obtain a spun yarn free from twist irregularity at a high speed, by placing an air-jet false twisting device which twists the yarn to the same direction as the true twist, at the turning part of a double twister. CONSTITUTION:A fiber bundle drafted with the drafting device 1 is introduced through the ballooning guide (the third air nozzle) 53 into a double twister. In the above process, the ballooning fiber bundle Y is guided along the balloon- protecting body 29, introduced into the first air nozzle 36 rotating integrally with the spindle 2, passed through the second air nozzle 35 (false twister) at the turning part, taken out of the system 2 rotating integrally with the spindle through the hollow guide tube 32, passed through the guide roller 33 of the stationary system and the traverse guide 28 moving reciprocatedly along the bobbin cover 23, and wound on a bobbin to obtain a package P. Preferably false twisting of the same direction as the true twist is carried out also in the third air nozzle 53 and the first air nozzle 36.

Description

Detailed Description of the Invention Technical field This invention heats a fiber bundle sent out by a draft device, turns the traveling direction of the fiber bundle, twists it twice as much as the rotation of the spindle, and winds it into a package inside a balloon. The present invention relates to a twist spinning method and apparatus.

BACKGROUND ART The oven-end spinning method and the ring vJH' method are widely used as methods for producing spun yarn by aligning short fibers and twisting them once, but each has advantages and disadvantages. In other words, the former open-end spinning method has a high spinning speed and can wind up the spun yarn into a large package, resulting in good productivity and operability, but the yarn strength is weaker than that of ring-spun yarn, resulting in relatively thick yarn. The problem is that it can only be used. In addition, although the latter ring spinning method can obtain high-quality yarn with a wide range of repeat counts, it has problems in that productivity is low and the winding package is small, so it requires a large number of doffs and a wine mite. be. In order to wind ring-spun yarn into large packages at high production rates, it is necessary to increase the ring diameter and rotate the packages at high speed. However, if the ring diameter is increased, the running speed of the labeler becomes faster and the speed of the labeler increases due to the frictional heat between the ring and the traveler, resulting in deterioration of the yarn quality and an increase in yarn breakage.
The traveler itself deteriorates without being damaged. Furthermore, when a large package is rotated at high speed, a new problem arises in that air resistance is large and energy consumption increases dramatically.

In contrast, a double-twist spinning method has been proposed in which the m8 bundle sent out from the draft device is heated and turned around in its traveling direction, adding twice as much effort as the rotation of the spindle, and then winding it into a package inside a balloon. There is. In this double-twist spinning method, after the yarn is ballooned, the yarn is turned back in its traveling direction and wound inside the balloon, so the yarn has many bending points, which increases the resistance of the yarn to pass through and causes excessive yarn tension. In addition, between the yarn turning point and the draft device, only half the actual twists of the yarn heated by RH are applied to the yarn, and the tensile strength is extremely low because there is little slippage resistance due to the compression between the fibers. If left as is, the yarn will not be able to withstand the tension applied to the yarn due to ballooning, and yarn breakage will occur, making spinning impossible. Therefore, when spinning yarn by the double-twist spinning method, in order to reduce the tension applied to the yarn, an element that has the effect of promoting the backward movement of the yarn and a yarn between the drafting device and the yarn turning point are used. In order to give yarn strength that can withstand ballooning, it is necessary to add false twist in the same direction as the actual twist at least near the turning point. Conventionally, in Japanese Patent Publication No. 38-19628, published on September 26, 1962, a nip roller was provided after the turning point during the progress of the yarn to mechanically promote the progress of the yarn, and An apparatus has been proposed in which a false-twisting mechanism is provided nearby that applies false-twisting by a mechanical action. However, the yarn coming out of the front roller of the drafting device is twisted and shrunk, and the speed at which the yarn travels constantly changes due to uneven thickness and tension fluctuations, making it impossible for mechanical action elements to respond to these changes at any time. Further, when the yarn entrainment promoting element and the false twisting element driven by a mechanical power transmission means are disposed inside the balloon, the structure becomes complicated and the size increases. This results in disadvantages such as increased costs, time-consuming maintenance, increased driving power, and the high speed rotation of the mechanism and supporting spindle, resulting in poor production.

Purpose This invention was made in order to solve the above-mentioned conventional problems, and its purpose is to improve the yarn advancement promoting effect element and ballooning, which are essential elements when putting the double base yarn type spinning method into practical use. It is an object of the present invention to provide a double-twist yarn spinning method and an apparatus therefor, which can use a simple mechanism to reduce the size and weight of a false twist imparting element to yarn in the process.

Structure of the Invention In order to achieve the above-mentioned object, the present invention does not promote the advancement of the yarn by a fluid flow, and at least the point at which the yarn turns back (the point at which the yarn finishes ballooning and the direction of travel coincides with the direction of rotation axis of the spindle). In the vicinity of the yarn turn-back point (hereinafter used in this sense), a fluid flow applied false twist having a heating direction in the same direction as the actual twist applied to the yarn by rotation of a spindle. In a second invention, the apparatus for carrying out the method of the first invention includes forming a thread guiding hole in the spindle for guiding the thread traveling while being heated to the upper part of the spindle by turning the thread in its traveling direction; , an air nozzle having at least a function of false twisting in the same direction as the actual twist applied to the yarn by rotation of the spindle is provided near the yarn turning point of the yarn guide hole so as to be rotatable together with the spindle; An air nozzle having at least a function of promoting yarn advancement was provided between the yarn winding point and the yarn winding point. Further, in a third aspect of the invention, a constriction portion is provided in the yarn passage of the air nozzle, which is arranged so that the yarn passage has a radial component with respect to the rotation axis of the spindle.

EXAMPLE An example embodying the present invention will be described below with reference to the drawings. A spindle 2 is vertically and rotatably supported via a bearing 5 fixed to a frame 3 and a support cylinder 4 below a draft device 1 that thins and continuously supplies the sliver. Fixed pulley 6
It is designed to be rotationally driven by a belt 7 via. As shown in FIG. 4, a bobbin support 8 is supported on the upper part of the spindle 2 through a bearing 9 so as to be rotatable relative to the spindle 2, and the bobbin support 8 has a magnet 10 fixed to its inner surface. By means of the magnet 12 fixed to the frame 3 via the bracket 11, even when the spindle 2 rotates, it is always held stationary without rotating accordingly. An iron plate 13 for magnetic flux convergence is attached to each of the magnets 10 and 12. A bobbin support 16 that supports a bobbin 15 for winding the spun yarn Y into a package P is mounted on a pipe 14 provided at the center of the bobbin support 8 with a bearing 17.
It is rotatably supported via. The lower part of the bobbin support 16 has a truncated conical shape, and turbine blades 18 are carved on the outer peripheral surface of the bobbin support 16. Air is injected from the injection hole 20 of the air chamber 19 formed in the bobbin support 8. It is rotatably driven by compressed air. The air chamber 19 and the outer peripheral surface of the spindle 2 are connected to the permanent magnet 2.
1 and a pair of pole pieces 22 forming a closed magnetic circuit.
and a magnetic fluid (not shown) interposed between the protrusion of the pole piece 22 and the outer periphery of the spindle.

A cylindrical bobbin cover 2 is provided on the upper surface of the bobbin support 8.
3 is formed, and a guide rail 24 extending in the vertical direction is fixed to the inner surface thereof. The guide rail 24 has a yarn guide 25. A moving body 28 including an iron plate 26 and a magnet 27 is supported so as to be movable in the vertical direction along the guide rail 24. The movable body 28 is installed outside the bobbin cover 23 in order to protect and cover the balloon of the thread Y. At the upper end of the guide rail 24 is a guide tube 3 that rotates together with the bobbin support 16.
A roller 33 that guides the yarn Y emerging from the upper end of the yarn guide 25 to the yarn guide 25 is rotatably supported.

The spindle 2 is formed such that one end communicates with the vibrator 14 and the other end opens to the side of the spindle 2 in order to turn back the traveling direction of the thread Y that is being heated and guide it upward through the spindle 2. A thread guide hole 34 is formed. Further, the yarn Y is passed through the yarn guiding hole 34 on the outer periphery of the spindle 2.
A support 37 is fitted so as to be rotatable together with the spindle 2, for attaching air nozzles 35, 36 for guiding the air nozzles 35, 36 to the spindle 2 so as to be rotatable therewith. A second air nozzle 35 is disposed horizontally and continuous with the entrance of the yarn guiding hole 34 so as to be located near the yarn turning point of the yarn guiding hole 34.
As shown in FIGS. 6 and 7, an air injection hole 39 is opened eccentrically and in the downstream direction with respect to the yarn passage 38.
It has a temporary iMffI function in the same direction as the actual twist applied to the yarn Y by the rotation of the spindle 2, and a function of promoting the progress of the yarn Y.

Further, the thread passage 38 is provided with a constricted portion 38a.

The second air nozzle 35 transports the yarn Y, which is ballooning between the bobbin cover 23 and the balloon protection forest 29, through the second air nozzle 35.
The M1 air nozzle 36 is arranged obliquely below the balloon protector 29 in order to guide the balloon smoothly.As shown in FIGS. It is opened in the orthogonal direction and has the function of false twisting in the same direction as the actual twist applied to the yarn Y.

On the outer periphery of the lower part of the support body 37, an annular permanent magnet 40 whose outer circumferential surface is fitted onto the inner surface of the support tube 4, and a pole piece 41 closely attached to both the upper and lower surfaces thereof are loosely rotatable relative to the support body 37. Once fitted, the pole piece 41 is sealed with a magnetic fluid (not shown) attached to a protrusion formed on the inner circumferential surface of the pole piece 41. Said permanent magnetism? :i40
The air chamber 1 is located on the outer peripheral surface of the support body 37 corresponding to the inner surface of the support body 37.
9 and an annular vortex 43 forming an air chamber 42 for supplying compressed air to the second air nozzle 35 and the first air nozzle 36.
is formed. The air chamber 42 and an external pressure air source (
(not shown) is connected via an air passage 44 formed between the permanent magnet 40 and the pole piece 41,
− has been done. An annular air chamber 45 is formed in the spindle 2 and communicates with the air chamber 42 in order to send the compressed air 4 of the air chamber 42 to the air chamber 19 provided in the bobbin support 8. A pair of air passages 46 communicating with the chamber 45 and the air chamber 19 are formed parallel to the axis of the spindle. Further, the air chamber 42 is provided in the support body 37.
In order to guide the compressed air to the second air nozzle 35 and the first air nozzle 36, an annular air chamber 47, 48, 49 and an air passage 50, 51, 52 connecting the air chambers are formed. Further, as shown in FIG. 1, a third air nozzle 5 is installed below the draft device 1 coaxially with the spindle 2.
3 is fixed. The third air nozzle 53 has a function of imparting a false twist to the yarn Y having a heating direction in the same direction as the actual twist, and a function of promoting the progress of the yarn.

Next, the operation of the spinning device configured as described above will be explained. Now, when the machine is started, the spindle 2 is rotated at high speed via the belt 7 and pulley 6. The fiber bundle that is thinned by the drafting device 1 and continuously sent out from the front roller 1a passes through the third air nozzle 53, advances along the balloon protector 29 while ballooning, and then passes through the first air nozzle 36 and the second air nozzle 35. be led to. The yarn exiting the second air nozzle 35 is passed through the yarn guide hole 3 formed in the spindle.
4, the traveling direction is turned back, the package P is guided upward through the pipe 14 and the guide tube 32, and the roller 3
3, the yarn guide 25 is reciprocated in the vertical direction via the magnet 31 by the operation of the cylinder 30, and the bobbin support 16 is traversed by the yarn guide 25.
The package P is wound onto a bobbin 15 which is rotated integrally with the package P. Since the package P is rotated together with the bobbin support 16 which is rotated by compressed air injected from the injection hole 20 of the air chamber 19 toward the turbine blade 18, the package P can be increased without controlling the air pressure of the air chamber 19. At the same time, the rotational speed is automatically reduced, and the yarn Y is wound onto the package P at a constant rate of 1 to 1 lux.

The yarn Y, which is being spun by the rotation of the spindle 2, is given an actual twist of half the number of twists that is finally heated between the front roller 1a and the yarn turning point, and from the yarn turning point to the roller. Roughly the same number of actual twists are applied until reaching 33 (or the winding point).

Therefore, in actual twisting due to the rotation of the spindle 2, the yarn between the front roller 1a and the yarn turning point has very low tensile strength due to poor slipping resistance due to the crimping between the fibers, and can withstand the tension applied to the yarn by ballooning. As a result, yarn breakage occurs and spinning becomes impossible. However, in this device, a second air nozzle 35 having a false twisting function and a yarn accelerating function is provided near the yarn turning point, and a first air nozzle 36 having a false twisting function is provided at the bending part of the yarn Y, so that the balloon process is prevented. A certain yarn Y is false twisted in the same direction as the actual twist by the second air nozzle 35 and the first air nozzle 36, and the yarn Y
The convergence and yarn strength are improved, it can withstand severe ballooning, and yarn breakage is less likely to occur. Moreover, the third air nozzle 53
Since the yarn Y is given a false twist in the same direction as the actual twist, the twist is sufficiently propagated to the front roller 1a, further improving the apparent yarn strength and reducing yarn breakage. In addition, the second air nozzle 35 and the third air nozzle 53 also have the function of promoting the progress of the yarn Y, so that they can reduce the passage resistance at the bending point of the yarn and prevent the yarn tension from becoming excessive. . A constriction part 38a is provided in the yarn passage 38 of the second air nozzle 35, which is disposed horizontally and continuously at the entrance of the yarn guide hole 34 of the spindle 2.
Since this is provided, the intake air flow from the outside is increased, and the centrifugal force does not prevent the passage of the outward air flow, thereby increasing the effect of promoting the progress of the yarn Y.

Although the constricted portion 38a is formed only in the second air nozzle 35, the constricted portion 38a may be provided in an air nozzle arranged such that the yarn passage 38 has a radial component with respect to the rotation axis of the spindle shear. preferable. Since the false-twisting action and progression acceleration action on the yarn Y are carried out by air, it is more responsive to thickness unevenness, changes in the number of required heatings due to tension fluctuations, and changes in yarn speed, compared to mechanical action that directly contacts the yarn. becomes possible. Compressed air is supplied to the second air nozzle 35 and the first air nozzle 36 through air chambers 47, 48, 49 and air passages 50, 51 formed in the support 37.
．． Since the twisting is carried out through 5'2, a mechanical false twisting element and a rapid progression promotion element are provided, and the twisting is extremely lightweight compared to this case.

It is effective to apply the false twisting element and the yarn entrainment promoting element near the bending of the yarn due to yarn folding. In particular, when the false twisting element is applied, the yarn passing through the point of false twisting has no temporary effect. Only the actual twist that is applied by the twist remains, so if the yarn turning point and the false twisting point are too far apart, the fibers will slip and break between them, so it is preferable that the distance between the two folds is less than three times the fiber length. .

Note that this invention is not limited to the above embodiments (
The air nozzle S shown in FIGS. 6 and 7 has a false twisting function and yarn advancement promotion function, and the air nozzle T1 has only a false twisting function shown in FIGS. 8 and 9. As shown in FIGS. The three types of nozzles, air nozzle U, which only has the advancement promotion function, are used as the 12th (
As shown in the figures a) to (h), the false twisting element and the yarn entrainment promoting element may be appropriately selected and arranged so as not to be missing.Also, the bending angle of the yarn near the turning point, the yarn path Due to the strong contact resistance with the yarn, the action of the false twisting element and yarn entrainment promoting element is not sufficiently propagated in the longitudinal direction of the yarn, resulting in an increase in tension, and problems such as yarn breakage, fluffing, and yarn unevenness due to insufficient number of twists. If there is a risk of this occurring, these nozzles may be stacked in multiple stages and arranged in the longitudinal direction of the yarn.Also, the third air nozzle may be replaced with a simple yarn guide. As described above, according to the present invention, by applying false twist in the same direction as the actual twist applied by the rotation of the spindle without directly mechanically contacting the yarn during the ballooning process, In addition to improving the strength, it also promotes the progression of the yarn, prevents an increase in passing resistance at the yarn bending point, and prevents yarn tension from becoming excessive. Ballooning can sufficiently withstand the tension applied to the yarn, reducing yarn breakage.Also, since the action on the yarn is not mechanical, it can cause uneven thickness, changes in the number of required heatings due to tension fluctuations, and changes in yarn speed. The rough false twist effect element and the rapid progression promotion effect element can be easily realized by combining a nozzle with a small air passage, making the structure of the device simple, lightweight and compact. In the third invention, in addition to the above-mentioned effects, by providing a constriction part in the yarn passage of the air nozzle, it is possible to suppress the air flow in the direction opposite to the light traveling direction caused by the centrifugal force, and to suppress the yarn traveling direction. It has an excellent effect of increasing the promoting effect.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment embodying the present invention, FIG. 2 is an enlarged sectional view taken along line A-A in FIG. 1, and FIG. 3 is a B-B in FIG. 1. 4 is a sectional view taken along line C-G in FIG. 3, FIG. 5 is a sectional view taken along line D-D in FIG. 4, and FIG. 6 is a sectional view of the second air nozzle. Figure 7 is a cross-sectional view taken along line E-E in Figure 6, Figure 8 is a cross-sectional view of the first air nozzle, Figure 9 is a cross-sectional view taken along line F-F in Figure 8, and Figure 10 is a yarn entrainment view. FIG. 11 is a cross-sectional view of an air nozzle having only a promotion function, FIG. 11 is a cross-sectional view taken along line GG in FIG. 10, and FIGS. 12(a) to (h) are cross-sectional views of main parts showing modified examples. Draft device 1, front roller'('a), spindle 2, bobbin support 8, billing holder 16, bobbin cover 2
3. Yarn guide 25, balloon protector 29, yarn guide hole 3
4, second air nozzle 35, first air nozzle 36, 'third
Air nozzle 53, thread Y1 package P0 Patent Applicant: Toyota Industries Corporation Toyota Industries Corporation Representative: Patent Attorney On 1) Hironobu Figure 6 E-91 8th Degree "," Figure 10 G, J Figure 7 Fig. 9 9 9 Fig. 11 9 121 (a) Fig. (b) (d)

Claims (1)

[Scope of Claims] 1. A double-twist spinning method in which a fiber bundle sent out from a draft device is heated, turned back in its traveling direction, twisted twice as much as the rotation of a spindle, and then wound into a package inside a balloon. , the yarn is promoted by a fluid flow, and at least near the yarn turning point (the point where the yarn finishes ballooning and its traveling direction coincides with the rotational axis direction of the spindle), the twist is the same as the actual twist applied to the yarn by the rotation of the spindle. A double-twist spinning method characterized by applying false twist with a heating direction using a fluid flow. 2. In a double-twist spinning device that heats the fiber bundle sent out by a draft device, turns the traveling direction of the fiber bundle, twists it twice as much as the rotation of the spindle, and winds it into a package inside a balloon. At the same time, a thread guiding hole is formed to guide the thread traveling upwardly into the spindle by turning the traveling direction of the thread, and the yarn that is turned back in the thread guiding hole completes ballooning and its traveling direction is in the direction of the rotational axis of the spindle. An air nozzle having at least the function of false twisting in the same direction as the actual twist applied to the yarn by the rotation of the spindle is provided near the spindle so as to be rotatable together with the spindle, and the draft device and the yarn winding point are connected to each other. 1. A double twist type spinning device, characterized in that an air nozzle having at least a function of promoting yarn progress is provided between the two. 3. The air nozzle has both the false twisting function and the yarn advancement function, and the air nozzle has a
Claim 2, characterized in that:
The double-twisting spinning device described in 2. 4. The fiber bundle sent out from the draft device is II+1
In a double-system spinning device, the yarn is twisted while being twisted, interrupting the progressing crystal, applying twist twice as much as the rotation of the spindle, and winding it into a package inside the balloon. At the same time as forming a guide hole that turns the traveling direction of the yarn and guides it to the direction of the spindle,
At least a temporary twist in the same direction as the actual twist applied to the yarn by the rotation of the spindle is located near the point where the yarn turns around in the yarn guiding hole and the yarn finishes ballooning and its traveling direction coincides with the rotational axis direction of the spindle. An air nozzle having a twisting function is provided so as to be rotatable integrally with the spindle, an air nozzle having at least a function of promoting yarn advancement is provided between the draft device and the yarn winding point, and the yarn passage of the air nozzle is provided between the draft device and the yarn winding point. A double twist type spinning device characterized in that a constriction section is provided in the yarn passage of an air nozzle arranged so as to have a radial component with respect to the rotation axis of a spindle.