JPS6247974B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD This invention relates to a spinning device for a rotor-type open-end spinning frame. Prior Art Generally, in a rotor-type open-end spinning machine, as shown in FIG. 1, a sliver 3 supplied from a supply port 2 of a spinning unit 1 is transported to a combing roller 6 by the joint action of a feed roller 4 and a presser 5. After the fibers are spread apart by the combing roller 6 and garbage such as leaf waste and fruit waste is discharged from the discharge port 7, the spread fibers are transferred to a conveyance channel 9 based on the negative pressure inside the rotor 8.
The air flow generated within the rotor 8 is fed into the rotor 8. The fibers fed into the rotor 8 adhere to the inner wall surface 8a of the rotor 8 by riding the swirling airflow within the rotor 8 generated by the action of the rotor 8 rotating at high speed, and then enter the fiber focusing groove 10 formed at the maximum inner diameter part. The fibers slide toward each other and are bundled into a ribbon in the fiber focusing groove 10, and are twisted by the rotation of the rotor 8, passed through the yarn pull-out hole 12 of the navel 11, and pulled out by the pull-out roller 13 and sent to the take-up roller 14. It is then wound up into the package 15. In this type of conventional device, when considering the flow of air into and out of the rotor 8, exhaust air as shown in Fig. There is a self-exhaust system with holes 21. In this self-exhaust system, the air inside the rotor 8 is discharged to the outside of the rotor 8 through the exhaust hole 21 due to the action of centrifugal force generated by the rotation of the rotor 8, and the inside of the rotor 8 becomes negative pressure, thereby creating a channel 9. and thread pull-out hole 1
Air flows into the rotor 8 through 2. on the other hand,
There is a forced exhaust system that does not have an exhaust hole 21 unlike the one shown in FIG. 1 (FIG. 8). This method uses a suction blower to suck out the air inside the rotor 8 from the annular gap between the boss 19 of the opening device 1 having the channel 9 and the inlet of the rotor 8. A negative pressure is created and air flows into the rotor 8 through the channel 9 and the thread pull-out hole 12. There is also a combination method that combines these self-exhaust methods and forced exhaust methods. In either method, the fibers fed into the rotor 8 by the airflow generated in the channel 9 based on the negative pressure in the rotor 8 ride on the swirling airflow in the rotor 8 generated by the action of the rotor 8 rotating at high speed. It adheres to the inner wall surface 8a of the rotor 8. Here, when comparing the speed of the swirling flow inside the rotor 8 and the speed of the airflow flowing inside the channel 9, the swirling flow inside the rotor 8 is an accompanying airflow generated by being drawn by the rotor inner wall surface 8a which is rotating at high speed. Rotor inner wall surface 8
It is very fast near a and becomes slower as it moves away from the inner wall surface 8a. On the other hand, the air flow flowing in the channel 9 has a circumferential speed of the combing roller 6 (20 to 30 m/s).
In the conventional device, the distance between the outlet of the channel 9 and the inner wall surface 8a of the rotor is long, and the outlet of the channel 9 is located at a place where the swirling flow inside the rotor 8 is slow. As a result, the air flow and fibers that entered the rotor 8 rapidly expanded and decelerated, causing the tips of the fibers to bend and the exit of the channel 9 to the rotor inner wall surface 8a. Even if the yarn is placed close to the outlet of the channel 9, the flow near the outlet of the channel 9 will be disturbed, and the tip will turn in a bent state and become hook fibers that will adhere to the rotor inner wall surface 8a. The drawback was that it was less powerful.
In addition, in the forced exhaust method and the self/forced combination method,
Since the swirling flow within the rotor 8 is discharged to the outside through the annular gap between the rotor inner wall surface 8a and the boss portion 19, some of the fibers that have entered the rotor 8 from the channel 9 enter the swirling flow. There was an inconvenience that, while riding on the vehicle, it was ejected from the rotor 8 before it attached to the inner wall surface 8a of the rotor. In order to solve this problem, the inner wall surface 8a of the rotor 8 is connected to the channel 9 as shown in FIG.
The cone is formed by extending the surface with which the fibers F transported into the rotor 8 first come into contact with each other, and the apex angle α of the cone is large.
It has been proposed that the apex angle formed by the remaining wall surface continuous to 0 becomes gradually smaller. In this device, the force that causes the fibers F transported into the rotor 8 and attached to the inner wall surface 8a to slide along the inner wall surface 8a is the force acting on the fibers F on the inner wall surface 8a and the flow due to the exhaust flow outside the rotor 8. force, which prevents useful fibers from being entrained out of the rotor 8 with the exhaust airflow. However, in this device, the channel 9 is connected to the inner wall surface 8a near the open end of the rotor.
Channel 9
Since the position of the fibers F fed into the rotor 8 is not specified and reaches over a wide range, the landing posture of the fibers on the rotor inner wall surface 8a varies,
In the process of the fibers F sliding on the rotor inner wall surface 8a, the fibers F may become entangled with each other, or the channel 9 may become entangled.
There is a possibility that the fibers F coming out of the thread directly collide with the thread and become wrapped around it. Further, the rotor inner wall surface 8a is curved, and as it approaches the fiber focusing groove 10, the inclination angle of the inner wall surface 8a becomes smaller than the rotor 8.
Since it becomes larger with respect to the plane perpendicular to the rotation axis of the rotor, the sliding force of the fibers decreases, and there is also the possibility that the fibers may gather on the rotor inner wall surface 8a and cause entanglement among the fibers. Purpose of the Invention The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to smoothly merge the air flow that enters the rotor from the channel outlet into the accompanying swirling flow on the rotor inner wall without decelerating the air flow. By placing the fibers in a straight state in the airflow and swirling flow, the fibers are quickly attached to the inner wall of the rotor from the tip, thereby preventing the fibers from becoming entangled with each other and reducing uneven thickness of the spun yarn. An object of the present invention is to provide a spinning device for a rotor-type open-end spinning frame that can reduce yarn defects, increase the effective fiber length of fibers constituting the yarn, and improve the strength of the yarn. Structure of the Invention In order to achieve the above object, the present inventors repeatedly conducted systematic experimental analysis and improvements to the rotor and the conveyance channel, and as a result, they reached the following knowledge. One of the most important things about a rotor-type open-end spinning machine is that the fibers are separated into individual fibers by the opening device and fed into the rotor by the airflow, without creating hooks, and instead remaining straight on the inner wall of the rotor. The objective is to increase the effective fiber length of the fibers that make up the yarn and to prevent the strength of the yarn from decreasing as much as possible. The basic idea to achieve this is to form a sufficient swirling flow near the channel, and to first ensure that the air flow from the channel to the rotor is smooth without creating deceleration flow or turbulence. By merging with the above swirling flow, the fibers are placed on the accelerated flow that flows smoothly from inside the channel toward the vicinity of the inner wall of the rotor, and the fibers remain straight without creating hooks, and the fibers are quickly transferred to the rotor. It is necessary to bring the fibers close to the inner wall of the rotor, and if this can be achieved, the fibers that approach the inner wall of the rotor will not only have the inherent inertia force in the radial direction of the rotor, but also spin and centrifugally ride on the very fast accompanying airflow that flows near the inner wall of the rotor. It adheres to the inner wall surface of the rotor under the action of force. The basic configuration for realizing this idea is, first, to provide a portion of the rotor with the fastest swirling flow over a sufficient length near the channel exit. In other words, the peripheral speed of the combing roller of the opening device is 20 to 30
m/s, and the air flow inside the channel is at a speed equal to or higher than the circumferential speed of the combing roller, and the cross-sectional area narrows as it approaches the rotor within the channel, resulting in an accelerated flow. By design, the airflow from the channel into the rotor remains at a considerable speed. Therefore, it is desirable to provide a location near the channel exit where the swirling flow within the rotor is as fast as possible to prevent the airflow from the channel from rapidly expanding or decelerating. Next, it is necessary to prevent turbulence from being created in the area around the channel outlet due to air flowing into the rotor from the channel. In order to achieve this, considering the reason why turbulent flow occurs, there is no problem if the air flowing into the channel smoothly merges with the swirling flow inside the rotor, but it is necessary to place the channel outlet closer to the inner wall of the rotor than necessary. If the air flowing into the rotor from within the channel collides violently with the inner wall of the rotor and bounces off, creating turbulent flow in the area near the channel exit, the turbulent flow will cause the fibers flowing into the rotor to Some of the yarn gets caught up in the flow, and some of it is discharged outside the rotor or becomes hook fibers and adheres to the inner wall of the rotor, reducing the strength of the yarn. As mentioned above, in order for the airflow from the channel to smoothly merge into the accompanying swirling flow inside the rotor without colliding with the rotor inner wall or decelerating more than necessary, the collection surface where the fibers are first captured by the rotor is necessary. It has been found that the length of the rotor in the axial direction needs to be at least a certain level, and that the distance between the rotor inner wall and the channel outlet needs to be close and within a certain range. The range of this distance is determined by the thickness and velocity distribution of the swirling flow formed by the rotation of the rotor, the velocity of the airflow at the channel exit and the subsequent deceleration rate. The present inventors have arrived at the present invention based on the above-mentioned knowledge. The spinning device in the rotor-type open-end spinning frame of the present invention has a linear collection surface having a predetermined length formed on a small diameter portion of a conical inner wall surface and having a small angle with respect to a plane perpendicular to the rotation axis. and a linear sliding surface having a large angle with respect to a plane perpendicular to the rotational axis formed in the large diameter part, and a predetermined rotor oriented toward the collection surface and close to the collection surface. and a conveying channel with an outlet formed within the range. The apparatus of the present invention having the above-mentioned configuration forms a linear collection surface having a small angle with respect to a plane perpendicular to the rotor axis with respect to the linear sliding surface on the inner wall of the rotor. The rotor shaft is designed to effectively bring the accompanying swirling flow caused by the collection surface as the rotor rotates closer to the surface of the rotor, and to smoothly merge the air flow and fibers from the conveyance channel outlet by having the collection surface have a predetermined length. An accompanying swirling flow is formed in advance by the collection surface over the length of the direction, and most of the fibers riding on the swirling flow can be attached to the collection surface. Furthermore, the device of the present invention directs the outlet of the conveyance channel toward the collection surface, and the air flow from the outlet of the conveyance channel is not so close to the collection surface that it collides violently with the collection surface, and the air flow is not spread out. The air flow from the outlet of the conveyance channel smoothly merges with the associated swirling flow formed by the collection surface of the inner wall of the rotor because it is located within a predetermined range that is not far enough to cause sagging or deceleration. As a result, the fibers conveyed along with the airflow in the conveyance channel ride in a straight state on the airflow from the conveyance channel outlet toward the collection surface of the rotor inner wall and the accompanying swirling flow formed by the collection surface of the rotor inner wall. In addition to the inertia force that the fibers originally had in the radial direction of the rotor at the exit of the conveyance channel, the centrifugal force that acts when the fibers swirl on the accompanying swirling flow accompanying the rotation of the rotor causes the fibers to be quickly collected on the inner wall of the rotor. It is attached to a surface. Effects of the Invention Therefore, the device of the present invention prevents the generation of hook fibers caused by bending of fibers and the entanglement of fibers with each other, thereby reducing uneven thickness of spun yarn and yarn defects, and improves the structure of yarn. This has the effect of increasing the effective fiber length of the fibers and improving the strength of the yarn. Aspects of the present invention Next, aspects of the present invention will be described. The spinning device in the rotor-type open-end spinning frame according to the first aspect of the present invention has the outlet portion of the conveyance channel directed to a substantially central position in the rotor axial direction of the collection surface of the inner wall of the rotor, and the outlet portion of the conveyance channel The fibers are arranged so that the distance l from the central axis of the rotor to the collection surface of the inner wall of the rotor falls within the following range (L is the fiber length) (1/20)L≦l≦L. The spinning apparatus of the first aspect of the present invention having the above-described configuration makes the effects of the present invention even more remarkable. The spinning device in the rotor-type open-end spinning frame according to the second aspect of the present invention has an angle θ formed by the collection surface of the inner wall of the rotor with respect to a plane perpendicular to the rotation axis.
₁₁ is 30°≦θ ₁₁ ≦60°, and the angle θ ₁₂ made by the sliding surface of the rotor inner wall with respect to the plane perpendicular to the rotation axis is
60°≦θ ₁₂ ≦80°, and the following relationship between the rotor axial length _h2 of the collection surface and the rotor axial length _h1 from the rotor open end to the bottom surface is 1/4≦h ₂ /h ₁ ≦1/1.5. The spinning device of the second aspect optimizes the length of the collection surface of the inner wall of the rotor. That is, in the second embodiment, in order to effectively utilize the effects, it is necessary to keep the length of the collection surface sufficiently long. In other words, if the collection surface is short, a swirling flow sufficient to merge the airflow flowing into the rotor from the conveyance channel will not be formed, and a portion of the airflow will not be attached to the collection surface and will be directed directly to the sliding surface. Therefore, the above-mentioned effects cannot be achieved.
In this sense, the length of the collection surface is made sufficiently long so that most of the air flowing into the rotor from within the conveyance channel flows toward the collection surface. but,
If the collection surface is made too long, the angle θ ₁₂ (see Figure 3) of the sliding surface will become too large in order to form the rotor while keeping the rotor's maximum inner diameter constant, which may cause problems due to reduced sliding force. Yes, undesirable. As shown in Fig. 5, when the length of the collection surface is experimentally investigated, the length of the collection surface is expressed as the length in the rotor axial direction, and the length of the collection surface in the rotor axial direction is h ₂ , When the axial length of the rotor from the open end to the fiber focusing groove is h ₁ , the ratio of h ₂ /h ₁ is 1/4 to 1/4.
It was found that a range of 1.5 is appropriate. The length of this collection surface is one of the important requirements in the present invention. The effects of the second aspect of the present invention are effective regardless of the self or forced exhaust system. In addition, in the second aspect, the angle θ of the collection surface
₁₁ is substantially within a small range of 30° to 60°, the fiber sliding force on the collecting surface is large, and the fibers attached to the collecting surface are generated at the open end of the rotor by forced exhaust method and self/forced combination method. Under the influence of the air discharged to the outside of the rotor, it moves away from the inner wall of the rotor,
It is not discharged outside the rotor together with the air.
Furthermore, in order to reduce the angle θ ₁₁ of the collection surface, the annular gap formed between the rotor collection surface and the boss near the open end of the rotor is in a relationship that narrows rapidly as it goes toward the open end of the rotor. Even if the fibers fed into the rotor from the inside fly toward the open end of the rotor riding the flow toward the outside of the rotor, the annular gap narrows rapidly toward the open end of the rotor, so the fibers The fibers have a high probability of adhering to the collection surface, and are effective in preventing the fibers from being discharged to the outside of the rotor. In the spinning device of the rotor-type open-end spinning frame according to the third aspect of the present invention, in the second aspect of the present invention, the central axis of the main flow flowing into the rotor from the outlet of the conveyance channel and the collection surface of the inner wall of the rotor The angle β is set within the following range of 5°<β<40°. In order to understand the optimal range of the angle between the central streamline of the air flow from the conveyance channel outlet and the collection surface of the rotor inner wall, the inventors of the present invention set the formation angle of the conveyance channel and the outlet part of the conveyance channel parallel to each other. As a result of conducting experiments with various lengths when formed, the above-mentioned range was reached as the desired range for forming airflow. Here, the definition of angle β will be specifically explained. In the case of a straight channel shape as shown in FIG. It is regarded as the angle between the center axis of the channel and the collection surface of the inner wall of the roller. Furthermore, if the outlet of the conveyance channel 9 is bent so as to be almost parallel to the plane perpendicular to the rotational axis of the rotor 8, as shown in FIG. For example, the central streamline of the airflow flowing through the conveyance channel 9 is bent slightly parallel at the parallel portion, but when it exits the outlet, it is hardly bent at the bent portion and the angle of the conveyance channel before the bent parallel portion is changed. In this case, the angle between the central axis of the conveyance channel before bending and the collection surface of the inner wall of the rotor can be regarded as β. Furthermore, instead of opening the outlet of the conveyance channel 9 on the side surface of the boss portion 19 as shown in FIGS. 7 and 8, a disc-shaped separator 22 is provided,
In the case where the outlet section is provided at a position facing the upper surface of the separator 22, and when the outlet section of the conveyance channel 9 is provided so as to face the vicinity of the outer periphery of the separator 22, the passage area is expanded, so parallel It can be considered that the direction changing effect of bending is weakened, and the conveyance channel exit part is bent by a certain length as in FIG. 6. In this case, the angle β is as explained in FIG. It can be regarded as a similar definition. The spinning device of the third aspect has an angle β formed between the central axis of the conveyance channel outlet and the collection surface of the inner wall of the rotor.
is set to a small optimum range to prevent the airflow from the conveyance channel outlet from colliding with the collection surface and the resulting reflected flow, thereby preventing the occurrence of turbulent flow near the conveyance channel outlet. . That is,
The air flowing into the rotor from inside the conveyance channel enters at a small angle with respect to the inner wall surface of the rotor, so it does not bounce back toward the channel exit and form turbulent flow in the area around the channel exit, and the air flows inside the rotor. The fibers bounce back to the direction and join the swirling flow inside the rotor, which has the effect of quickly bringing the fibers close to the inner wall of the rotor from inside the conveyance channel without bending them, and causing them to adhere to the collection surface of the inner wall of the rotor. In the spinning device of the rotor-type open-end spinning frame according to the fourth aspect of the present invention, in the third aspect, the distance l from the central axis of the conveyance channel outlet section to the collecting surface of the rotor inner wall is within the following range. (1/3)L≦l≦(1/2)L. In the fourth aspect, since the distance between the conveyance channel outlet and the opposing inner wall surface is set to 1/2 or less of the average fiber length, the fiber tip starts to move from the time when the fiber tip attaches to the collection surface of the rotor inner wall. moves at the same speed as the circumferential speed of the rotor, while the trailing end of the fiber is still in the channel, and the large speed difference between the leading and trailing ends of the fiber causes the fiber to be stretched straighter and move closer to the rotor. Adheres to the inner wall. In the spinning device of the rotor-type open-end spinning frame according to the fifth aspect of the present invention, in the first aspect, the collecting surface formed in the small diameter part of the inner wall of the rotor and the sliding surface formed in the large diameter part are different from each other. , are formed so as to be connected via a step surface formed by a wall extending in the radial direction. In the fifth aspect, when the fibers attached to the collection surface formed in the small diameter part slide toward the maximum inner diameter part of the rotor, while the rear ends of the fibers are attached to the collection surface, the step surface Beyond this point, the fiber tip contacts a sliding surface with a larger radius than the collection surface, and the fiber tip is suddenly pulled due to the large difference in centrifugal force based on the difference in radius between the collection surface and the sliding surface, which improves the straightness of the fiber. increases. A spinning device in a rotor-type open-end spinning frame according to a sixth aspect of the present invention, in the fourth aspect, has a linear spinning device having a small angle with respect to a plane perpendicular to the rotation axis at the maximum inner diameter portion of the inner wall surface of the rotor. A fiber accumulation surface is formed continuously on the sliding surface. In addition to the fourth aspect, the sixth aspect adds a linear fiber accumulation surface, so it not only provides the effects of the second to fifth aspects described above,
Effects unique to the sixth aspect are achieved. When we experimentally investigated the angle β between the central streamline of the airflow from the channel and the inner wall surface of the rotor in order to achieve the effect of the third aspect described above, it was found that 5° to 40° is suitable. Ta. In this sixth aspect, this numerical value will be replaced with the shapes of the conveyance channel and the rotor. As shown in FIG. 3, the angle between the central axis of the conveyance channel and the plane orthogonal to the rotor rotation axis is θ ₂ , and the angle between the conical surface near the open end of the rotor, that is, the collection surface, and the plane orthogonal to the rotor rotation axis. The angle θ ₁₁ formed, and the position of the central axis of the conveyance channel when viewing Fig. 3 from above and regarding the rotor as a flat circle, is usually 1/3 to 2 of the maximum inner diameter Rm of the fiber focusing groove. The relationship is such that it flows into the rotor through a distance of /3Rm. When considering these positional relationships, the angle β between the channel center axis and the rotor inner wall surface should be in the range of 5° to 40° in a cross section of the rotor vertically divided parallel to the axial direction on a plane that includes the channel center axis. In order to achieve this, the position of the central axis of the conveyance channel should be approximately 1/2Rm, and under the condition of θ ₂ = 25°, the angle θ ₁₁ of the collection surface near the open end of the rotor should be 30
It is in the range of 60° to 60°, preferably 35° to 55°. Since the angle θ ₁₁ is small in this way, if the shape of the inner wall of the rotor is composed of a single conical surface that has the function of collecting the fibers and the sliding function of sliding the fibers to the focusing groove, the diameter of the boss portion with the channel will decrease. The inner diameter of the rotor becomes very large compared to the conventional method, and the spinning conditions become narrower due to the increase in yarn tension during spinning. Also, if the inner diameter of the rotor is not increased, the boss diameter will become smaller and the cross-sectional area of the channel will become smaller, and the airflow flowing through the channel will be extremely reduced.
It becomes virtually impossible to feed fibers into the rotor through the channel. Therefore, in order to reduce the angle θ ₁₁ and obtain an ideal rotor shape, the shape of the rotor inner wall surface should be a conical surface consisting of three straight lines: the collection surface near the open end of the rotor, the sliding surface, and the fiber focusing groove. It is most appropriate to consist of By setting the angle β between the central axis of the channel and the collection surface in the range of 5° to 40°, the fibers fed into the rotor from within the channel disposed close to the collection surface are The tip quickly attaches to the collection surface,
As the yarn is stretched straight, the rear end also adheres to the collecting surface, reducing uneven thickness of the spun yarn and yarn defects, and improving yarn strength. Embodiment Next, an embodiment embodying the present invention will be described with reference to FIG. This embodiment belongs to all of the above-mentioned first to fifth aspects, and is basically the same in configuration as the conventional apparatus shown in FIG. 1, with only the rotor shape and conveyance channel being different. The rotor shape is shown in Figure 3. As shown in FIG. 3, the shape of the rotor in this embodiment is such that its inner wall surface has a collection surface 16 for adhering the spread fibers sent into the rotor 8 from the channel 9, and It consists of three conical surfaces: a sliding surface 17 that guides the opened fibers to a fiber focusing groove 10 formed at the maximum inner diameter portion, and a fiber focusing groove 10. In a cross section obtained by vertically dividing the rotor along a plane parallel to the rotor rotation axis including the center axis of the channel 9, the center axis of the channel 9 and the collection surface 1
The angle θ ₂ between the central axis of the channel 9 and a plane perpendicular to the rotation axis of the rotor 8 is set to 25 degrees so that the angle β between the channel 9 and the rotation axis of the rotor 8 is 25 degrees. The angle θ ₁₁ made with the orthogonal plane was set to 50°. In order to keep the length of the collection surface 16 sufficiently long, the rotor axial length h ₁ from the rotor open end to the fiber focusing groove 10 is 10.5 mm, and the rotor axial length h ₂ of the collection surface 16 is 4.8 mm. As such, the ratio of h ₂ /h ₁ was set to approximately 0.46. Furthermore, the fibers were inserted into the open end of the rotor 8 so that the central axis of the channel 9 was extended so that the distance between the point where the fiber reached the collection surface 16 and the outlet end of the channel 9 was less than 1/2 of the average fiber length. Boss part 19
The outlet end of the channel 9 is opened on the side surface of the channel 9, and the outlet end of the channel 9 is provided so that when the central axis of the channel 9 is extended, the position at which it reaches the collection surface is approximately at the center of the collection surface 16. . Boss part 19
There is a thread pull-out hole 12 in the center for pulling out the thread Y.
A navel 11 having a diameter is provided. Note that an exhaust hole 21 is formed in the bottom portion 20 of the rotor 8 . Next, the operation of the apparatus configured as described above will be explained. Now, the fibers F (only one is shown as a representative), which have been spread apart by the combing roller 6, are sent into the rotor 8 along with the air flow through the channel 9, and pass through the collection surface 16 and the sliding surface 17, and then the fibers F are spread into pieces by the combing roller 6. The threads are focused in the focusing groove 10 and twisted by the rotation of the rotor 8 to form a thread Y, which is pulled out through the thread pull-out hole 12 and wound around a package. The distance from the outlet end of the channel 9 to the collection surface 16 is less than 1/2 of the average fiber length, so that the air flowing from the channel 9 into the rotor 8 can slide without violently colliding with the collection surface 16. As the fibers flow in and bring the fibers close to the collection surface, the fibers turn under the influence of the accompanying airflow near the collection surface, and the tip of the fiber F is immediately collected due to the influence of centrifugal force. Face 16
The rotor 8 attempts to make a rotational movement together with the rotor 8. On the other hand, since the rear end of the fiber F is still within the channel 9 at this time, as the leading end moves together with the rotor 8, the fiber F comes out of the channel 9 while contacting the exit edge of the channel 9.
Therefore, the fibers F are sufficiently stretched and adhere to the collection surface 16 in a straight state, slide on the sliding surface 17, and are focused in the fiber focusing groove 10, so that the fibers Y
The effective fiber length of the fibers F constituting becomes longer. In this example, the strength of the cotton yarn of cotton count 20S is 46 kg expressed as Lee strength, and in the conventional device shown in Fig. 1, the Lee strength is 40.1 kg when the rotor inner wall surface 8a has an inclination angle of 74 degrees. The effectiveness of the examples has been demonstrated (see table below). It has also been confirmed that there is no discharge of fibers from the open end of the rotor other than yarn. The results of experiments conducted in other similar embodiments by changing the angle θ ₁₁ of the collection surface and the length h ₂ of the collection surface are shown in FIGS. 4 and 5. Collection surface 16 and channel 9
It is recognized that there are appropriate values for the angle β between the central axis and the length of the collection surface 16.

[Table] In the embodiment shown in FIG. 10, the collection surface 16 and the sliding surface 17 are connected via a stepped surface 24 formed between them by a wall extending in the radial direction of the rotor 8. Therefore, from the collection surface 16 to the sliding surface 1
The fibers transitioning to 7 are now rapidly elongated. In other words, with the stepped surface 24 as a boundary, the rear end of the fiber remains attached to the collection surface 16, and the tip comes into contact with the sliding surface 17 whose diameter has suddenly increased, so that the difference in centrifugal force due to the difference in radius is reduced. This causes the fibers to be rapidly pulled and elongated. As a result, the fibers are straightened and slide from the sliding surface 17 to the fiber focusing groove 10. The size of this stepped surface 24 is determined by the size of the rotor 8.
compared to the rotor radius at the fiber focusing groove 10 of
If it is in the range of 1/40 to 1/4, the effect of fiber elongation can be obtained. Specifically, in the case of the rotor radius of 20 mm, it was effective that the step surface 24 had a size of 3 mm. Note that this invention is not limited to the above embodiments. For example, as shown in FIG. 6, the vicinity of the outlet of the channel 9 is bent horizontally so that the flow at the horizontal bend is within a few mm, so that the final direction and the plane perpendicular to the rotational axis of the rotor 8 are aligned. It may be formed so that the angle θ ₂ is 0°. Since the length of the horizontal bent portion is short, the airflow within the channel 9 is slightly bent at the horizontal bent portion, but ultimately the airflow is directed toward the inner wall of the rotor along the forming angle of the channel.
Instead of opening the outlet of the channel 9 on the side surface of the boss portion 19 as shown in FIG.
In addition, an outlet may be provided at a position facing the upper surface of the separator 22. In this case, the portion indicated by A is regarded as the exit of the channel 9 for convenience. Furthermore, as shown in FIG. 8, the thread pulling hole 12 may be provided in the center of the bottom 20 of the rotor 8, or the tip of the channel 9 may be formed with a pipe 23 without providing the boss portion 19 as shown in FIG. good. Further, this device can be applied to any of the self-exhaust type, forced exhaust type, and a combination of both. Moreover, the 10th
In the embodiment shown in the figures, the step surface 24 does not need to be formed by a wall surface perpendicular to the rotor central axis, and may be at an angle in the vertical direction with respect to the perpendicular surface. As detailed above, according to the above embodiment, the fibers entering the rotor from the channel are attached to the collection surface in a straight posture, and then quickly slide on the sliding surface and enter the fiber collecting groove. Since the fibers are bundled, the effective fiber length of the fibers constituting the yarn becomes longer and the yarn strength increases. In addition, since the fibers exiting the channel quickly adhere to a narrow area on the collection surface, the entanglement of the fibers with each other is reduced, which helps to improve yarn strength, reduce thickness unevenness, and reduce yarn defects. Furthermore, the number of fibers wound around the yarn is reduced, thickness unevenness is reduced, yarn defects are reduced, and the texture of the yarn is similar to that of ring-spun yarn. Further, there is no discharge of fibers from the open end of the rotor, and an excellent effect is achieved in that all the raw materials are effectively turned into yarn.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a rotor-type open-end spinning frame, Fig. 2 is a sectional view of main parts of a conventional device, Fig. 3 is a sectional view of main parts showing an embodiment of the present invention, and Fig. 4 5 is a diagram showing the change in the Lee force of the spun yarn by changing the angle β between the central axis of the channel 9 and the collection surface, and _FIG. )/(rotor axial length h ₁ from the rotor open end to the fiber focusing groove) Diagrams showing changes in the Lee strength of the spun yarn, 6th to
FIG. 10 is a sectional view of a main part showing a modified example. Rotor...8, Channel...9, Fiber focusing groove...10, Yarn pull-out hole...12, Collection surface...1
6. Sliding surface...17. Fiber...F. Channel 9
Channel 9 in the cross section when the rotor is vertically divided parallel to the rotor rotation axis on a plane including the central axis of
The angle between the central streamline of the airflow from the center and the collection surface 16...β, The angle between the collection surface and a plane perpendicular to the rotor's rotation axis... _θ11 , Orthogonal to the rotor's rotation axis Angle between the plane and the sliding surface... θ ₁₂ , Angle between the final direction of the channel and a plane perpendicular to the rotor rotational axis... θ ₂ , Length of the collection surface in the rotor axial direction... h ₂ , The axial length of the rotor from the open end of the rotor to the fiber focusing groove... _h1 .

Claims (1)

[Claims] 1. A yarn drawer in which the spread fibers sent along with the air flow from the conveyance channel are attached to the inner wall surface of the rotor, and the fiber bundles converged in the fiber convergence groove provided at the maximum inner diameter portion are arranged in the center. In a rotor-type open-end spinning machine that continuously pulls out the spinning frame while twisting it through a hole, it has a predetermined length formed on the small diameter part of the conical inner wall surface, and is formed at a small angle with respect to the plane perpendicular to the axis of rotation. a linear sliding surface formed in a large diameter portion and having a large angle with respect to a plane perpendicular to the rotation axis; 1. A spinning device for a rotor-type open-end spinning frame, characterized by comprising a conveyance channel having an outlet portion formed so that the distance to the collection surface is within a predetermined range close to each other. 2. The outlet portion of the conveyance channel is oriented approximately at the center of the collection surface of the rotor inner wall in the rotor axial direction, and the distance l from the central axis of the outlet portion of the conveyance channel to the collection surface of the rotor inner wall is A spinning device in a rotor-type open-end spinning frame according to claim 1, characterized in that the spinning device is arranged so that (1/20) L≦l≦L within the range shown (L is the average fiber length). . 3 The angle θ ₁₁ formed by the collection surface of the rotor inner wall with respect to a plane perpendicular to the rotation axis is 30°≦θ ₁₁ ≦60°, and the angle formed by the sliding surface of the rotor inner wall with respect to a plane perpendicular to the rotation axis. θ ₁₂ is set to 60°≦θ ₁₂ ≦80°, and the length h ₂ of the collection surface in the rotor axial direction is related to the rotor axial length h ₁ from the open end of the rotor to the bottom surface as follows: 1/ The spinning device in a rotor-type open-end spinning frame according to claim 1, characterized in that the spinning device satisfies 4≦h ₂ /h ₁ ≦1/1.5. 4. A patent claim characterized in that the angle β between the center streamline of the main flow flowing into the rotor from the outlet of the conveyance channel and the collection surface of the inner wall of the rotor is within the following range: 5°<β<40° A spinning device in a rotor-type open-end spinning frame according to item 3. 5. A patent characterized in that the distance l from the central axis of the conveyance channel outlet to the collection surface of the inner wall of the rotor is within the following range: (1/3)L≦l≦(1/2)L. A spinning device in a rotor-type open-end spinning frame according to claim 4. 6. Claim 6, characterized in that a linear fiber accumulation surface having a small angle with respect to a plane perpendicular to the rotational axis is formed at the maximum inner diameter portion of the inner wall surface of the rotor, and is continuous with the sliding surface. A spinning device in a rotor-type open-end spinning machine according to item 5. 7. The collection surface formed on the small diameter portion of the inner wall surface of the rotor and the sliding surface formed on the large diameter portion are coupled via a step surface formed by a wall extending in the radial direction. A spinning device in a rotor-type open-end spinning frame according to claim 1.