Wire drawing machine wire arranging groove cylinder and wire arranging method capable of reducing wire bundle edge lifting and end face depression

Abstract

The application belongs to the technical field of glass fiber yarn production equipment, and particularly relates to a wire drawing machine wire arranging groove cylinder capable of reducing yarn ball edge lifting and end face depression and a wire arranging method thereof. The wire arranging groove cylinder comprises positive and negative spiral grooves and a turning transition groove; the turning transition groove comprises a deceleration section and an acceleration section; the deceleration section is smoothly connected to the positive and negative spiral grooves at a natural turning vertex position. The wire arranging groove cylinder and the wire arranging method thereof disclosed by the application not only help to reduce yarn ball edge lifting and end face depression, but also can reduce the abrasion or collision point number between a sliding shuttle and the groove cylinder.

Description

Technical Field

[0001] This application belongs to the technical field of fiberglass yarn production equipment, specifically relating to a yarn tray for a drawing machine and a yarn tray arrangement method that can reduce yarn curling and end face concavity. Background Technology

[0002] Please see Figure 1 In a fiber drawing machine that uses a grooved cylinder for fiberglass yarn winding, the fiberglass yarn is pulled by a winding shuttle on the winding groove cylinder and wound back and forth on a fiberglass yarn paper tube on the main shaft of the drawing machine to form a nearly cylindrical yarn ball. The winding shuttle is driven by forward and reverse spiral grooves in the winding groove cylinder. When the winding shuttle moves to the two ends of the forward and reverse spiral grooves, it automatically reverses direction and continues winding in the opposite direction.

[0003] The quality of the positive and negative spiral curves on the yarn tray directly affects the forming quality of the cylindrical yarn bundle, as well as the lifespan of the shuttle and the tray. It also affects the production of high-end products in smaller sizes, and the speed cannot be increased. Therefore, the tray curve is very important.

[0004] The intersecting spiral grooves at both ends of the cable tray are typically transitioned using circular arc grooves to reduce wear and improve steering efficiency. The transition groove in the steering section is referred to as the steering transition groove in this application.

[0005] Please see Figure 2 and Figure 3 This type of rounded transition involves connecting the top intersections with a large rounded arc, essentially shortening the curves at both ends and connecting them with a large rounded arc. This causes the yarn to linger too long at both ends of the yarn bundle, resulting in larger flared edges at both ends. (See also...) Figure 4 The advantage is that the shuttle passes through corners very smoothly, and the shuttle's linear speed can be relatively high. From Figure 3 As can be seen from this, when the vertex of the center line of the transition groove formed by this transition groove shifts negatively, the turning motion of the shuttle will experience negative drift, that is, the turning trajectory of the shuttle is located inside the natural connecting line of the positive and negative spiral grooves.

[0006] Please see Figure 5 and Figure 6 This type of arc transition occurs on the outer side of the intersection of the positive and negative spiral groove curves, that is, near the intersection of the two curves, where the yarn suddenly accelerates and pulls apart, connecting and transitioning through a small arc. While this prevents edge curling due to the short dwell time of the yarn at both ends of the yarn bundle, it can result in a larger indentation at both ends due to the insufficient time spent by the yarn at these points. (See also...) Figure 7 The yarn is prone to splitting, the shuttle drum is easily damaged, and the linear speed is not fast. From Figure 6 As can be seen from this, when the vertex of the center line of the transition groove formed by this transition groove shifts positively, the turning trajectory of the shuttle will drift positively, that is, the turning trajectory of the shuttle will be located outside the positive and negative spiral grooves. Summary of the Invention

[0007] In view of this, this application provides a yarn drawing machine yarn tray and yarn routing method that can reduce yarn curling and end face concavity, so as to solve all or part of the technical problems described in the background section of this application.

[0008] The innovative idea behind this application is as follows:

[0009] 1. Improve the steering transition groove to include both a low-speed section and an acceleration section. The low-speed section allows the cable shuttle to smoothly pass through the steering apex, and then the acceleration section accelerates back to the normal spiral groove. This avoids the defects of the two existing steering methods and has the advantages of both.

[0010] 2. The low-speed section of the turning transition groove and one of the forward and reverse spiral grooves are made to form a natural and smooth connection at the natural turning apex of the forward and reverse spiral grooves. Thus, the turning transition groove basically exists on the spiral groove in one direction. The spiral groove that is naturally and smoothly connected to the turning transition groove can be properly laid without forming curling edges or depressions. At the same time, since the turning transition groove includes both the low-speed section and the acceleration section, the curling edges formed in the low-speed section and the depressions formed in the acceleration section can complement each other, thereby minimizing the curling edges of the yarn bundles and the depressions on the end face.

[0011] The solution provided in this application to resolve its technical problem is as follows:

[0012] A yarn drawing machine grooving cylinder capable of reducing yarn curling and end face concavity includes a cylinder body with a forward spiral groove and a reverse spiral groove on the cylinder body; the forward spiral groove and the reverse spiral groove are smoothly connected at their intersection points by a turning transition groove; characterized in that: one end of the turning transition groove is smoothly connected to one of the forward spiral groove or the reverse spiral groove at the natural turning apex of the forward spiral groove and the reverse spiral groove.

[0013] Preferably, the other end of the steering transition groove is smoothly connected to another spiral groove in the forward spiral groove and the reverse spiral groove that does not establish a smooth connection with the steering transition groove near the natural steering apex.

[0014] Preferably, the actual turning point of the turning transition groove deviates from the midline of the forward and reverse spiral grooves.

[0015] Preferably, the actual turning point of the turning transition groove deviates from the natural turning point of the forward spiral groove and the reverse spiral groove.

[0016] Preferably, the steering transition groove includes a deceleration section and an acceleration section; the deceleration section and the acceleration section are smoothly connected; the other end of the deceleration section is smoothly connected to a forward spiral groove or a reverse spiral groove near the natural steering apex; the other end of the acceleration section is smoothly connected to a reverse spiral groove or a forward spiral groove.

[0017] Preferably, the forward spiral groove forms the center line of the forward spiral trajectory; the reverse spiral groove forms the center line of the reverse spiral trajectory; the turning transition groove forms the center line of the transition groove trajectory; the center line of the transition groove trajectory passes through the natural intersection point of the forward and reverse trajectory lines at both ends of the groove cylinder body, which is also the natural turning vertex; and at the natural intersection point of the forward and reverse trajectory lines, which is also the natural turning vertex, it smoothly connects with the center line of the forward spiral trajectory or the center line of the reverse spiral trajectory.

[0018] Turning process description: The shuttle travels along the spiral trajectory of the grooved cylinder curve to the top arc. The shuttle turns and returns along the top arc. After turning past a point on the top arc, the shuttle accelerates back to the normal spiral groove. The shuttle travels along the normal spiral groove trajectory to another top turning and acceleration zone and performs the same turning and acceleration to enter the normal spiral groove trajectory. In other words, the shuttle can smoothly pass through the arcs at both ends and turn. The yarn accelerates to the normal spiral groove trajectory through the shuttle's appropriate multi-turn trajectory, so that the yarn stays less at both ends, reducing the curling at both ends of the yarn ball and the indentation of the yarn ball near the end face, thus neutralizing the advantages and disadvantages of the two existing arc transitions.

[0019] The wiring method corresponding to the aforementioned wiring trough is as follows:

[0020] A yarn laying method for a drawing machine that can reduce yarn curling and end face concavity, using a yarn laying groove tube; characterized in that: it includes a normal yarn laying step and a turning yarn laying step; in the normal yarn laying step, the yarn laying shuttle can slide along the current spiral groove to the natural turning apex of the forward spiral groove and the reverse spiral groove and enter the turning yarn laying step at the natural turning apex.

[0021] Preferably, the steering cable routing step includes a deceleration step and an acceleration step; in the deceleration step, the cable routing shuttle decelerates and slides out of the current spiral groove along the deceleration section of the steering transition groove; in the acceleration step, the cable routing shuttle accelerates and slides into the target spiral groove to be switched along the acceleration section of the steering transition groove.

[0022] Preferably, the center line of the transition groove trajectory passes through the natural intersection point of the positive and negative trajectory center lines at both ends of the groove body, which is also the natural turning vertex, and smoothly connects with the center line of the positive or negative trajectory at the natural intersection point of the positive and negative trajectory, which is also the natural turning vertex.

[0023] Preferably, the actual turning point of the turning transition groove deviates from the natural turning point of the forward and reverse spiral grooves.

[0024] Preferably, the actual turning point of the turning transition groove deviates from the midline of the forward and reverse spiral grooves.

[0025] Beneficial technical effects:

[0026] 1. The yarn drawing machine yarn tray and its yarn tray method disclosed in this application can reduce yarn curling and end face depression. One end of the turning transition groove is smoothly connected to the forward spiral groove or the reverse spiral groove at the natural turning apex, which can ensure that the shuttle can normally lay yarn in the spiral groove before or after turning, so as not to form curling or depression.

[0027] 2. Since the turning transition groove includes both a low-speed section and an acceleration section, the warping formed in the low-speed section can complement the concavity formed in the acceleration section, further reducing the degree of warping or concavity of the yarn bundle.

[0028] 3. Since one end of the turning transition groove is smoothly connected to the forward or reverse spiral groove at the natural turning apex, the number of collision points between the shuttle and the groove cylinder during the turning process is reduced, which helps to reduce the wear of the shuttle and the groove cylinder and extend the service life of the equipment.

[0029] The technical solution and technical effects of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0030] Figure 1 Schematic diagram of the cable tray cable routing principle;

[0031] Figure 2 Schematic diagram of the cable tray structure with negative displacement at the turning vertex;

[0032] Figure 3 : Figure 2 Enlarged view of the structure of part A;

[0033] Figure 4 : Figure 2 Corresponding yarn bundle structure diagram;

[0034] Figure 5 Schematic diagram of the cable tray structure with forward shift of the turning vertex;

[0035] Figure 6 : Figure 5 Enlarged view of the structure of part B;

[0036] Figure 7 : Figure 5 Corresponding yarn bundle structure diagram;

[0037] Figure 8 This application presents a schematic diagram of a yarn drawing machine's yarn tray structure that can reduce yarn curling and end face concavity.

[0038] Figure 9 : Figure 8 Enlarged view of the structure of part C;

[0039] Figure 10 : Figure 8Corresponding yarn bundle structure diagram;

[0040] Figure 11 : Schematic diagram of the deceleration and acceleration sections on the steering transition groove;

[0041] Icon description:

[0042] 1-Trough body,

[0043] 2- Positive spiral groove, 21- Center line of positive spiral trajectory,

[0044] 3-Reverse spiral groove, 31-Center line of reverse spiral trajectory,

[0045] 4-Steering transition groove, 41-Deceleration section, 42-Acceleration section, 43-Center line of transition groove trajectory;

[0046] 5-Natural turning vertex;

[0047] 6- Actual turning vertex;

[0048] 7-Median line. Detailed Implementation

[0049] Terminology Explanation: In this application, the natural turning vertex refers to the intersection point formed by the natural extension of the center lines of the positive and negative spiral grooves without the presence of a turning transition groove. The actual turning vertex refers to the actual turning vertex formed by the center lines of the positive and negative spiral grooves after a smooth connection via a turning transition groove. The median line refers to the connecting line of the median intersection points located on the same side of the cable tray among the multiple median intersection points formed by the positive and negative spiral grooves at the middle part of the cable tray.

[0050] Please see Figure 8 , Figure 9 , Figure 10 The yarn drawing machine trough disclosed in this application, which can reduce yarn curling and end face concavity, includes a trough body 1, on which a forward spiral groove 2 and a reverse spiral groove 3 are provided. The forward spiral groove 2 and the reverse spiral groove 3 are smoothly connected at the two ends of the trough body 1 by a turning transition groove 4.

[0051] The center line 21 of the positive spiral trajectory of the positive spiral groove 2 and the center line 31 of the negative spiral trajectory of the reverse spiral groove 3 naturally extend to form the natural turning vertex 5. In reality, the cable shuttle does not turn at the natural turning vertex 5, and the natural turning vertex 5 is not a real point or corresponding structure. The concept of natural turning vertex 5 is defined in this application only for the purpose of explaining and limiting the technical solution of this application.

[0052] The forward spiral groove 2 and its forward spiral trajectory centerline 21, and the reverse spiral groove 3 and its reverse spiral trajectory centerline 31 extend around the groove body 1 and intersect each other at the middle part of the cable tray to form multiple intermediate intersection points. The connecting line of the intermediate intersection points located on the same side of the cable tray forms the midline 7. The purpose of defining the midline in this application is to illustrate and limit the technical solution of this application, and the reasons will not be elaborated here.

[0053] The steering transition groove 4 includes a deceleration section 41 and an acceleration section 42; the deceleration section 41 and the acceleration section 42 are smoothly connected; the other end of the deceleration section 41 is smoothly connected to the forward spiral groove 2 at the natural steering apex 5; the other end of the acceleration section 42 is smoothly connected to the reverse spiral groove 3.

[0054] The center line 43 of the transition groove 4 passes through the center line 21 of the positive spiral trajectory of the positive spiral groove 2 and the center line 31 of the negative spiral trajectory of the reverse spiral groove 3, which intersect at both ends of the groove body 1 to form a natural turning vertex 5; and it is smoothly connected to the center line 21 of the positive spiral trajectory at the natural turning vertex 5.

[0055] Please see Figure 11 , Figure 11 The curves labeled +δx and -δx correspond to... Figure 3 and Figure 6 The center lines of the two shuttle tracks are shown. The curve highlighted in bold black is the center line 43 of the transition groove track in this application, which includes both deceleration section 41 and acceleration section 42. From Figure 11 It can be seen that the curve shapes of deceleration section 41 and acceleration section 42 are derived from the +δx and -δx curves, respectively. Therefore, the drive of the cable shuttle also exhibits the driving characteristics of the -δx and -δx curves, respectively. The difference lies in that the turning apex of the +δx and -δx curves does not pass through the natural turning apex 5, but instead forms positive and negative offsets of δx, respectively. In this application, the deceleration section 41 curve passes through the natural turning apex 5 and smoothly connects to the center line 21 of the positive spiral trajectory of the positive spiral groove 2.

[0056] When the cable laying process is underway, the cable laying shuttle driven by the +δx and -δx curves must accelerate and decelerate respectively to pass the center line 7 of the groove body 1, which can easily cause edge warping or end face denting. However, the cable laying shuttle driven by the center line 43 of the transition groove trajectory of this application can pass the center line 7 of the groove body 1 at the normal operating speed of the shuttle, thereby reducing edge warping or end face denting by about 50%.

[0057] After the shuttle slides through the deceleration section 41 and enters the acceleration section 42, it accelerates back to transition to the normal spiral groove (in this embodiment, the reverse spiral groove 3) for normal cable laying.

[0058] When the yarn shuttle passes through the deceleration section 41 and the acceleration section 42, it may still form a certain degree of warping and end face depression. However, since the center line 43 of the transition groove trajectory includes both the deceleration section 41 and the acceleration section 42, the warping and end face depression formed when the yarn shuttle turns on the same side of the groove cylinder body 1 can be balanced to a certain extent. This can further reduce the degree of warping or end face depression of the yarn bundle.

[0059] Furthermore, in existing systems, the turning apex of both the +δx and -δx curves is located on the midline 7 of the slotted cylinder body 1. This results in a point of significant wear or impact on both sides of the turning apex when driving the cable shuttle. Since both ends of the slotted cylinder body 1 have turning transition grooves, there are a total of four points of significant wear or impact on the cylinder. In this application, because the deceleration section 41 smoothly connects to the forward spiral groove 2 at the natural turning apex 5, the cable shuttle does not need to accelerate or decelerate when passing the midline 7. Therefore, there is only one point of significant wear or impact on the turning transition groove 4, and a total of two points of significant wear or impact on the slotted cylinder body 1. This reduces the number of collision points between the shuttle and the slotted cylinder during the turning process, which helps reduce wear on both the shuttle and the slotted cylinder, extending the equipment's service life.

[0060] Please see Figure 8 and Figure 9 In this application, the actual turning vertex 6 of the transition groove trajectory centerline 43 deviates from the midline 7 and the natural turning vertex 5 of the forward and reverse spiral grooves, and the distance of deviation from the midline 7 is Dx. In practice, the structure and dimensions (such as curvature) of the transition groove trajectory centerline 43 can be flexibly adjusted by adjusting the value of Dx to adapt to the specific requirements of production for turning time, yarn quality, etc.

[0061] The yarn routing methods corresponding to the yarn routing groove of the drawing machine that can reduce yarn curling and end face concavity include normal routing steps and turning routing steps.

[0062] In the normal wiring step, the wiring shuttle can slide along the current spiral groove at the normal wiring speed to the natural turning vertex 5 formed by the intersection of the forward spiral groove 2 and the reverse spiral groove 3, and enter the turning wiring step at the natural turning vertex 5 (that is, after crossing the median line 7 at the normal wiring speed, it enters the turning wiring step).

[0063] Unlike existing cable routing methods, where the cable routing tube must accelerate or decelerate within the turning transition groove, which can easily cause edge warping or end face denting, this application uses a turning transition groove 4 that is smoothly connected to the forward spiral groove 2 or the reverse spiral groove 3. The cable routing shuttle can slide across the center line 7 and the natural turning vertex 5 at normal speed, thereby reducing edge warping or end face denting by approximately 50%. Furthermore, it reduces the number of impact points or heavy wear points within the turning groove from two to one.

[0064] The cable shuttle enters the turning cable routing step (corresponding to the turning process of the cable shuttle), and successively goes through a deceleration stage and an acceleration stage to transition from the current spiral groove to the destination spiral groove (in this embodiment, it is from the forward spiral groove 2 to the reverse spiral groove 3).

[0065] In the deceleration step, the cable shuttle decelerates and slides out of the current spiral groove along the deceleration section 41 of the turning transition groove 4; in the acceleration step, the cable shuttle accelerates and slides into the target spiral groove that needs to be switched along the acceleration section 42 of the turning transition groove 4.

[0066] When the yarn shuttle passes through the deceleration section 41 and the acceleration section 42, it may still form a certain degree of edge curling and end face depression. However, since the same side of the grooved cylinder includes both the deceleration section 41 and the acceleration section 42, the edge curling and end face depression on the same side can be compensated to a certain extent, further improving the quality of the yarn ball.

[0067] The complete wiring process of this application is as follows (indicated by...). Figure 8 (For example, to illustrate):

[0068] BZ01, the cable shuttle travels along the spiral trajectory of the grooved cylinder curve to the top arc (that is, the entrance of the deceleration section 41 of the turning transition groove 4).

[0069] BZ02, the cable shuttle turns back following the top arc (that is, it decelerates and slides out of the current spiral groove in the deceleration section 41 to turn towards the spiral groove 2).

[0070] BZ03, the cable shuttle turns past a point through the top arc (that is, the cable shuttle enters the acceleration section 42 through the deceleration section), so that the shuttle accelerates back to the normal spiral groove (that is, the cable shuttle accelerates in the acceleration section 42 to transition back to the normal spiral groove, i.e., the reverse spiral groove 3 starts normal cable laying).

[0071] BZ04, the cable-laying shuttle reaches another top turning acceleration zone along the normal spiral groove trajectory and performs the same turning acceleration to enter the normal spiral groove trajectory (that is, the shuttle lays the cable normally along the normal spiral groove trajectory line to the turning transition groove 4 at the other end of the groove body 1; similarly, it turns at low speed and accelerates back to the normal spiral groove, that is, the forward spiral groove 2 to start normal cable laying).

[0072] The BZ01-BZ04 cycle enables continuous yarn drawing and winding. This allows the shuttle to smoothly navigate the arcs at both ends and turn, accelerating the yarn to the normal spiral groove trajectory through the shuttle's appropriate multi-turn path. This minimizes yarn dwell time at both ends, reducing edge curling and yarn indentation near the end face, thus mitigating the advantages and disadvantages of the two existing arc transition methods.

[0073] It should be noted that the above embodiments are all described using the example of the cable shuttle turning from the forward spiral groove 2 into the reverse spiral groove 3. In the variations, the cable shuttle may also turn from the reverse spiral groove 3 into the forward spiral groove 2. However, the structure of the turning transition groove 4 on the cable groove remains unchanged, including a deceleration section 41 and an acceleration section 42, and the deceleration section 41 and the current spiral groove are smoothly connected at the natural turning apex 5.

[0074] Furthermore, in all the above embodiments, the cable-laying shuttle transitions from the current spiral groove through the deceleration section 41 and the acceleration section 42 to return to the normal spiral groove; in variations, the movement trajectory of the cable-laying shuttle can also be reversed. Figure 8 For example, the yarn guide shuttle can also transition from the current spiral groove (reverse spiral groove 3) through the acceleration section 42 and the deceleration section 41 to return to the normal spiral groove (forward spiral groove); that is, the yarn guide shuttle first accelerates in the acceleration section 42 and enters the deceleration section 41, and then decelerates smoothly in the deceleration section 41 to switch to the normal spiral groove. Although the motion states are reversed, both can achieve the technical effect of reducing yarn curling and end face defects, as well as reducing the number of wear or bump points.

[0075] The technical solutions and effects of this application have been described in detail above with reference to the accompanying drawings and specific embodiments. It should be noted that those skilled in the art can develop other embodiments based on this. Any simple modifications and equivalent substitutions that do not depart from the innovative concept of this application are covered by this application and fall within the protection scope of this patent.

Claims

1. A wire drawing machine trough that can reduce yarn curling and end face depression, including the trough body (1). The grooved cylinder body (1) is provided with a forward spiral groove (2) and a reverse spiral groove (3); The forward spiral groove (2) and the reverse spiral groove (3) are smoothly connected at their intersections by a turning transition groove (4); Its features are: One end of the turning transition groove (4) is smoothly connected to one of the forward spiral groove (2) or the reverse spiral groove (3) at the natural turning vertex (5) of the forward spiral groove (2) and the reverse spiral groove (3); The steering transition groove (4) includes a deceleration section (41) and an acceleration section (42); The deceleration section (41) and the acceleration section (42) are smoothly connected; The other end of the deceleration section (41) is smoothly connected to the forward spiral groove (2) or the reverse spiral groove (3) at the natural turning apex (5); The other end of the acceleration section (42) is smoothly connected to the forward spiral groove (2) or the reverse spiral groove (3).

2. The yarn drawing machine grooving tube according to claim 1, which can reduce yarn curling and end face concavity, is characterized in that: The actual turning point (6) of the turning transition groove (4) is offset from the natural turning point (5) of the forward spiral groove (2) and the reverse spiral groove (3).

3. The yarn drawing machine grooving cylinder according to claim 1, which can reduce yarn curling and end face concavity, is characterized in that: The actual turning vertex (6) of the turning transition groove (4) is deviated from the midline (7) of the forward spiral groove (2) and the reverse spiral groove (3).

4. The yarn drawing machine grooving tube according to claim 1, which can reduce yarn curling and end face concavity, is characterized in that: The positive spiral groove (2) forms the center line (21) of the positive spiral trajectory; The reverse spiral groove (3) forms the center line (31) of the reverse spiral trajectory; The steering transition groove (4) forms the center line (43) of the transition groove trajectory; The center line (43) of the transition groove passes through the center line (21) of the positive spiral trajectory and the center line (31) of the negative spiral trajectory at the natural turning apex (5) at both ends of the groove body (1); and is smoothly connected to the center line (21) of the positive spiral trajectory or the center line (31) of the negative spiral trajectory at the natural turning apex (5).

5. A yarn-laying method for a drawing machine that reduces yarn curling and end-face concavity, comprising using the yarn-laying groove of claim 1; characterized in that: This includes normal wiring procedures and reverse wiring procedures; In the normal wiring step, the wiring shuttle can slide along the current spiral groove to the natural turning vertex (5) of the forward spiral groove (2) and the reverse spiral groove (3) and enter the turning wiring step at the natural turning vertex (5).

6. The yarn drawing machine yarn arrangement method according to claim 5, which can reduce yarn curling and end face concavity, is characterized in that: The steering cable arrangement steps include a deceleration step and an acceleration step; In the deceleration step, the cable shuttle decelerates and slides out of the current spiral groove along the deceleration section (41) of the turning transition groove (4); In the acceleration step, the cable shuttle accelerates along the acceleration section (42) of the turning transition groove (4) and slides into the target spiral groove that needs to be switched.

7. The yarn drawing machine yarn arrangement method according to claim 5, which can reduce yarn curling and end face concavity, is characterized in that: The center line (43) of the transition groove passes through the center line (21) of the positive spiral trajectory and the center line (31) of the negative spiral trajectory at the natural turning vertex (5) at both ends of the groove body (1), and is tangent to the center line (21) of the positive spiral trajectory or the center line (31) of the negative spiral trajectory at the natural turning vertex (5).

8. The yarn drawing machine yarn arrangement method according to claim 5, which can reduce yarn curling and end face concavity, is characterized in that: The actual turning point (6) of the turning transition groove (4) deviates from the natural turning point (5) of the forward spiral groove (2) and the reverse spiral groove (3).

9. The yarn drawing machine yarn arrangement method according to claim 5, which can reduce yarn curling and end face concavity, is characterized in that: The actual turning point (6) of the turning transition groove (4) deviates from the midline (7) of the forward spiral groove (2) and the reverse spiral groove (3).

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