JPS6044223B2 - Yarn take-off device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a yarn take-up device and method, and more particularly to a device and method for discharging continuously taken-up yarn in a coil shape through a rotating guide path and storing and collecting it in a can or the like.

For example, in the process of manufacturing SF cotton, which is a synthetic fiber, a large number of yarns spun in the spinning process are bundled together (referred to as tow), and then stored and accumulated in cans (tow cans), cases, etc. Then, in the drawing process, the tow is pulled out from this raw yarn tow can, drawn, crimped, etc., and cut.
It is common to use F cotton.

By the way, in recent years, in order to improve productivity, the spinning speed of yarn has been increasing rapidly, and currently it is 2.500 rn/Min ~
High speed spinning of 5,0001 T1/Min has been attempted.

The conventional methods used to store tow spun at such high speeds in tow cans, such as the nip reel method or the simple coiler method, do not allow the tow traveling at high speed to be stored neatly in tow cans, resulting in problems in the subsequent process. It is impossible to avoid problems such as tangles of the tows during drawing, wrapping in subsequent processes, and breakage of the threads. In the conventional nip roller method,
Since the yarn falls vertically into the tow can, the tow seems to pierce the tow accumulation layer at high speed, and when the tow is pulled out from the tow can, tangles and tangles occur, making it impossible to pull out the tow normally.

In addition, with the conventional coiler method,
As shown in Japanese Patent Publication No. 46-20805, etc., the tube that guides and rotates the yarn bundle (sliver) is open at the bottom of the coiler wheel, so when the tow is running at high speed, the tow will pierce. There are problems such as fuzzing of the yarn due to bending of the yarn at the exit of the coiler, and a problem that the tow cannot be stably formed into a coil shape. To solve the problems of the conventional coiler device, a device for collecting synthetic fiber tow traveling at high speed and storing it in a tow can was developed.
No. 51-133537 discloses that a high-speed traveling yarn is suctioned by a fluid ejector (air jet) and the yarn is transported by a curved tube or tubular guide path (yarn guiding tube) that rotates concentrically with the fluid ejector. The yarn is swung out in the tangential direction of the circumference, and the rotation of the tubular guide path (coiler) is opposite to the yarn discharge direction to offset the yarn traveling speed with the circumferential speed of the coiler and create a stable yarn coil. It has been proposed to form a

By using such an apparatus and method, it is possible to swing out a yarn in a coil shape at high speed. However, there are the following problems when using such a device. First, the first problem is that the thread bundle traveling within the thread guide tube becomes tangled, causing a phenomenon in which the thread guide tube is blocked. Therefore, the inventors of the present invention conducted various studies on the causes of blockage, and found that the root cause of such blockage phenomenon is that the thread guide tube, which has a circular cross section, is curved. It has been found that this is because the compressed air jetted out from the fluid ejector flowing through the tube rotates, and as a result, the yarn bundle also travels while rotating inside the yarn guide tube. When a tension fluctuation wave such as a threading operation of the yarn bundle is transmitted to the yarn bundle traveling while turning inside the yarn guiding tube,
When a disturbance is added to the swirling motion of the yarn bundle, the yarn bundle collides within the narrow yarn guide tube, causing the yarn guide tube to be instantly blocked. The second problem is that single yarn abrasions, generally referred to as fuzzing of the yarn bundle, occur. This occurs because, due to the swirling of the compressed air mentioned above, the yarn bundle does not pass through the center of the yarn guide tube, but instead runs while constantly scraping against the wall surface of the yarn guide tube. As a result, damage to the inner wall of the filament tube is also significant.
Moreover, since the yarn guide tube is curved, even if the inner wall of the tube is subjected to surface treatment to improve wear resistance, it is extremely difficult to perform the treatment smoothly and continuously. The third problem is that the compressed air ejected from the outlet of the yarn guide tube along with the yarn bundle falls while already drawing a coiled trajectory and collides with the yarn bundle, disturbing the coil forming.

Generally, a fluid ejector is provided to apply tension to the yarn bundle so that the yarn bundle is not wound up by the roller group provided in the previous process, but when the yarn bundle is taken up at high speed, this fluid ejector is The speed of the compressed air ejected from the tube is in the subsonic range, and as it passes through the yarn guide tube, the speed gradually decreases, and when it is jetted out from the outlet of the yarn guide tube, it is 2 to 3 times the traveling speed of the yarn bundle. It has a certain speed. Therefore, when the compressed air blown out from the outlet of the yarn guiding tube collides with the yarn bundle several phases earlier, which is already falling while taking a coiled trajectory, the coil formation of the yarn bundle is easily disturbed. It is. Moreover, the compressed air also causes the yarn bundle that is falling to become loose, thereby deteriorating the cohesiveness of the yarn bundle.
In addition, when the thickness of the yarn bundle is thin compared to the running speed of the yarn, the above-mentioned disturbance effect of the compressed air is large. It had to be approximately 110 to 150 mm in diameter. However, if the coil diameter is made small like this, the coiler wheel must be rotated at an extremely high speed. Therefore, the residual false twist of the yarn bundle is 2 per meter.
The number of times increased from 3 times to 3 times, causing various troubles in post-processes such as the stretching process. The present invention provides a yarn take-off device and method that solves these problems.

To explain the device of the present invention, the device of the present invention includes a yarn take-up device, a yarn inlet located below the device, rotatable about a vertical axis, and opening coaxially with the vertical axis, and a yarn opening in the circumferential direction. In a yarn take-up device that is equipped with a coiler having a three-dimensionally curved yarn guide path connected to a yarn discharge port and deposits yarn in a coil shape, the yarn guide path is formed in a radial shape that widens at the end, and This yarn take-off device is characterized in that the shape of the rear wall surface of the guide path satisfies the following formula. However, L = distance in the circumferential direction (MM) from any point on the projection radius of the vertically projected locus (virtual locus that the thread passes when the coiler is stationary) on the horizontal plane to the horizontally projected line on the rear wall surface = Distance from the center (vertical axis) measured along the vertical projection trajectory (
MM) R = projected on a horizontal plane (plane perpendicular to the vertical axis)
Distance (MM) from the point corresponding to the above S on the rear wall surface to the center (vertical axis) o = Set yarn take-up speed (MM/SEC
)ω.

= Coiler setting rotation speed (radian/SEC) A detailed explanation will be given below based on an example not shown.

FIG. 1 is a schematic cross-sectional view of a synthetic fiber tow storage device using an embodiment of the device of the present invention. In the figure, reference numeral 1 denotes a pair of nip rollers, which sandwich the tow Y between them and send it out at a constant speed.

The traveling speed of the tow Y is defined by the same speed of the nip roller 1. 2 is a compressed air ejector which sucks the tow Y sent out from the nip roller 1 and takes it over.

The compressed air ejector blows the compressed air supplied from the compressed air supply port 2a from the nozzle 2b to the tow Y by the ejector effect.
is sucked in, and the tow Y is ejected downward with compressed air and taken off.

Reference numeral 3 denotes a coiler, which includes a hollow cylindrical body 5 in which a driving pulley 4 is formed and is rotatably held, and a coiler head 7 attached to the cylindrical body 5 and forming a curved yarn guide path 6 with a radially expanding shape. Consists of. Koira 3 is Ejikuta 2
It is arranged coaxially with the tow Y and rotates in the X direction in the figure with respect to the running center of the tow Y, that is, the vertical axis Z. 8 is a tow can that is swung out from the coiler head 7 and stores the tow that falls in a coiled manner.

As shown in FIGS. 2 and 3, the yarn guide path 6 of the coiler head 7 has a yarn introduction port 6a opened coaxially with the vertical axis Z and an opening extending in the circumferential direction on the outer peripheral surface of the coiler head 7. It has a radial shape that is three-dimensionally curved and widens at the end by connecting the thread discharge ports 6b. The tow Y is ejected downward by the ejector 2, passes through the thread passage 5a of the cylindrical body 5, reaches the vertically opened introduction port 6a, and is deflected in the radial direction of the coiler head 7 along the guide path 6. 6 is swung out along the rear wall surface 6c (guiding surface located at the rear with respect to the rotational direction Here, the shape of the guide path 6, particularly the rear wall surface 6c, is determined as follows in order to smoothly guide the tow.

FIG. 5 is a projection view of the yarn guide path 6 on a vertical plane, and is a vertical projection view of a virtual running trajectory of the tow Y when the tow Y is ejected with the coiler head 7 stationary. The tow Y runs along the bottom wall surface 6d of the guide path 6, and the center of the tow Y is on the trajectory 0.
Take P. The shape of the bottom wall surface 6d is made so that the center locus of the tow follows a straight line trajectory of the arc 0M1, and the bottom wall surface 0 corresponds to the 0M section. M0 is in the shape of a circular arc with a curvature ρ, and the reach (2) is a straight line that makes an angle of 0 with the horizontal plane. The tow Y travels along the bottom wall surface and is deflected from the vertical direction to the radial direction at point 0, so the curvature ρ of this deflection part depends on the traveling speed, the shape and thickness of the tow, but normally 30MM or more is preferable.
Further, it is desirable that θ, which defines the discharge angle of the tow Y, be in the range of 50 to 500 in order to form a stable coil. FIG. 6 is a horizontal projection view of the yarn guide path 6, in which the tow Y runs along the rear wall surface 6c as the coiler head 7 rotates in the X direction, and its center trajectory is ideally from the rear wall surface 6c. A locus 0''Q obtained by subtracting the radius of the tow Y is traced. Here, the horizontal plane projection locus 0''Q1 on the tow Y and the shape 0''0Q0 of the rear wall surface 6c are determined as described below.

Distance S to any point T on the vertical projection locus 0P of the tow Y
(MM), and the set take-up speed of tow Y is ■. (MM/S
EC), and the set rotation speed of the coiler is ω. (Radian/SE
As C), the distance L in the circumferential direction from the projection of the locus 0P corresponding to the point T, that is, the point on the projection radius σV, to the traveling locus 0''Q of the tow Y is approximated by the following formula.Here, R is , is the distance from the center 0'' to the point TR on the trajectory corresponding to the point, and is equal to the distance 0'' on the virtual radius 0''P'' (MM).

If we consider the motion of the tow Y, ignoring the frictional force between the tow Y and the coiler and the centrifugal force of the tow, the traveling trajectory of the tow Y will be a uniform motion along the virtual radius 0P and a motion accompanying the rotation of the coiler head. It is considered to be a synthetic movement with.

Therefore, the horizontal projected locus of the tow Y is the velocity V in the radial direction. The angular velocity ω is relative to the motion of the coiler head and the rotation of the coiler head in the X direction. It becomes a composite trajectory with the backward movement in the circumferential direction, and when it reaches point T on the virtual radial trajectory 0P, it moves L in the circumferential direction. If there is a displacement, this displacement L″o in the circumferential direction is given by the product of the displacement angle and the radius σ.R=ω0V
0-S-R, which is nothing but the L given earlier.
Therefore, the horizontal projection line of the travel locus of the tow Y takes a curve approximated by the equation (1). here,
As for the horizontal projection shape of the rear wall surface 6c of the guide path, in FIG. 6, the distance L in the circumferential direction from the projection radius σV to the horizontal projection view of the bottom wall surface 6c is set as follows, with the above-mentioned L being a reference.

The reason why L is determined as above is that LO is an approximate calculated value, and in reality, the above range provides a practically optimal shape if the thickness of the tow, friction of the tow, centrifugal force, etc. are considered. That is, in the case of L-threading, the friction force between the yarn and the rear wall surface becomes strong, causing damage to the yarn and causing trouble during yarn drawing in the next step. Also, L>mu! In this case, it becomes difficult to balance the rotation of a recoiler with a large guide opening area. On the other hand, since the yarn is discharged away from the rear wall surface, the yarn becomes susceptible to the influence of discharged air, resulting in problems such as poor convergence of the yarn and instability of the coil. In addition, if the shape of the rear wall surface is not a smooth curved surface, turbulence will occur in the exhaust airflow, causing problems such as poor convergence of the yarn and unstable coils. Create a smooth, continuous curved surface with no unevenness while satisfying the formula.

In order to determine the horizontally projected shape of the rear wall surface 6c based on the above, the shape of the reference virtual radius locus vertically projected locus, that is, the shape of the bottom wall surface 6d, is determined, and then the shape is determined from the horizontally projected locus of the virtual radius locus using equation (2). The shape of the rear wall surface 6c is determined by determining the distance L in the circumferential direction to the horizontal projection locus of the rear wall surface 6c.

When calculating the distance L using equation (2), the set take-up speed V of the tow Y.

(MM/Sec) and the set rotation speed ω of the coiler. (Radian/Sec) is determined by the following method. First, the set take-up speed V of the tow Y.

is 2.5×101 to 8.3× depending on the brand to be spun.
It is preferable to set it within a range of 101 (MM/Sec)°. In VO〈2.5×101(MM/Sec),
It is difficult to obtain a stable coil with this device, and the VO
〉8.3×101 (MM/Sec), in order to obtain a stable coil, the set rotation speed ω of the coiler. This requires a significant increase in the amount of water, creating equipment problems. Next is the set rotation speed ω of the coiler.

Determine. This ω. To determine this, first set the optimum tow coil diameter by considering the specifications of the tow can to be collected, the falling distance of the tow coil, the denier of the tow, and the set take-up speed of the tow Y. When making this setting, , it is preferable to confirm by normal experiment.Subsequently, set take-up speed V of tow Y (MM/Sec) and set tow coil diameter D (MM)
Therefore, using the formula below derived from the continuity relationship of the threads,
Coiler setting rotation speed ω. (Radian/Sec) is calculated. However, α = the angle that the tow makes with the horizontal plane immediately after being discharged from the coiler.

Incidentally, α can be almost approximated by setting the angle of inclination of the coiler to 0 as shown in FIG.

The set take-up speed V of the tow Y is determined by the above method.

Coiler setting rotation speed ω. Determine. Furthermore, specific examples will be described. Now, 50,000 denier tow is supplied to the coiler at a set take-up speed of 5.83 x 1σ (MM/Sec), and the tow coil discharged from the coiler has an inner diameter of 80 cm, a height of 1 mm, and a bottom below the coiler. 6
It is stored in an n1 cylindrical tow can.

First, the optimum rotation speed of the coiler is selected through experiments. In the case of this example, as a result of investigating the stability of the tow coil and the storage condition of the tow coil, it was found that a tow coil diameter D of 270 (MM) is favorable. If the toe coil diameter is too large, the stability of the coil will decrease; for example, if the toe coil diameter is 35
At 0 (MM), the tow coil begins to collapse 1 (M) below the coiler, so the can storage condition worsens at this point and at the bottom below. Further, if the coil diameter is too small, for example, when the tow coil diameter is 200 (MM), the tow coil is stable, but when the coil is attached to the can, rotational movement occurs and the can storage condition of the tow coil deteriorates. The optimum coil diameter is 270 (MM)
If you use it as a proxy, ω. =406 (radian/Sec). However, this is a combination in which the inclination angle θ of the coiler is set to 0.349 (radian). In the device of the present invention, since the yarn guide path formed in the coiler head has a radial shape that widens toward the end as described above, the yarn runs along the rear wall surface of the guide path as shown in FIGS. 3 and 4. The compressed air is blown out from the outer periphery in a coil shape, and the compressed air from the ejector is discharged with a velocity distribution as shown in FIG.

Therefore, since the tow Y is hardly affected by the air jet at the point where it is blown out from the coiler head, the yarn can be stably formed into a coil. In addition, since the guide path 6 has a radial shape, the air is separated from the yarn, and the interference of the air with the yarn is reduced.The upper guide path has a larger cross-sectional area than the yarn. Therefore, there is no occurrence of yarn entanglement or blockage within the guide path. In addition, since the rear wall surface has a shape similar to the trajectory of the yarn, the yarn runs smoothly along the rear wall surface, reducing friction and abrasion with the wall surface, and the pressurized air flow does not swirl, so the yarn travels smoothly. Since the threads do not turn, there is little friction between the threads and the wall surface, and there is almost no damage to the threads. In addition, as mentioned above, since there is no effect of the ejected pressure air flow on the formation of coils of yarn, there is no need to reduce the diameter of the forming coils. It also has the advantage of being wider. In the above-mentioned embodiment, the front wall surface 6e of the guide path 6 was formed in the radial direction, but as is clear from the above description, this front wall surface allows for efficient separation of the flow of the ejected pressurized air and the running yarn. Any shape may be used as long as it can be used.

If desired, for example, as shown in FIG. 7, in the horizontally projected shape of the rear wall surface 6c, the shape of the exit side of the rear wall surface 6c may be changed to points W, . Q
``Circle S inscribed at o.

The opening of the yarn guide path 6 may be enlarged by retreating to the peripheral surface. However, the diameter of the circle SO shall be 113 or less of the outer diameter of the coiler. That is, the horizontal projection locus of the rear wall surface 6c mentioned above is O''
0WQ″o.In a coiler with such a rear wall surface, when the yarn is discharged from the coiler, there is almost no contact between the rear wall surface of the coiler exit portion and the yarn, so there is no separation of the single yarn, and the yarn converges. It has the advantage that a tow coil with good properties and stability can be obtained.Furthermore, if desired, for example, in the horizontally projected shape of the coiler as shown in FIG. , with the coiler outer peripheral wall facing the opposite side of the coiler rotation direction X, the shaded part has a depth of 5wr
m or more may be cut and removed. The vertical width of this cut portion is approximately the width of the main strip, and the horizontal length is Q.
It is desirable that Q″o is in the range of 118 to 112 of the outer circumference of the coiler.In such a coiler, when the yarn is discharged from the coiler, there is almost no contact between the yarn and the outer circumferential wall of the coiler, so that the single yarn is easily separated. The device of the present invention has the advantage that a tow coil with good convergence and stability can be obtained.As described above, although the influence of friction and abrasion between the traveling yarn and the guide wall surface is reduced, it can be used for a long period of time. In this case, wear of the conduit wall surface is unavoidable.

For this purpose, it is preferable to coat the guide path with ceramic coating or diamond coating, and in order to ensure smooth running of the yarn and reduce friction, the surface roughness of the yarn guide path is preferably about 0.5S to 5S. The curved and complex shape of the channel makes coating and surface finishing operations difficult and almost impossible with conventional tubular channels. However, in the device of the present invention, the yarn is guided by the rear wall surface 6c.
The shapes of the front wall surface 6Ja and the top wall surface 6f can be arbitrarily determined as long as they do not interfere with the separation of the ejected pressurized air. When applying ceramic coating, diamond coating, etc. to the rear wall surface 6C1 of the conduit and the bottom wall surface 6d, the surface finish can be achieved by opening the upper wall surface 6f above the turning point 0 of the tow as shown by the dotted line 6f'' in Figure 5. The shape of the bottom wall surface 6d, which is convenient and can improve the abrasion resistance of the guide wall without affecting the yarn guiding function and the air pressure separation function, has a great influence on the yarn guiding and coil formation.

First, the shape of the bottom wall surface 6d has a curvature ρ shown in FIG.
, each inclination angle θ is P3OMM or more, 5 songs≦O≦50
0 is preferable, but the reason for this is that when ρ is 30 MM or less, the impact at the yarn change direction (00rs-40) becomes large, causing severe damage to the yarn, resulting in single yarn breakage and subsequent This will cause thread breakage in the next process. Therefore, the larger ρ is, the more preferable it is, but p should be set at 5 in consideration of reducing the size of the coiler head.
It is preferably 0 MM or more and 500 MM or less. Also, the inclination angle θ
Regarding θ, when θ is set to 5M or less, the vertical distance between the formed coils becomes too narrow, making them susceptible to external disturbances, resulting in unstable yarn coil deposition, which causes the yarn to fail in the subsequent process. This causes trouble when pulling out the strips. O is 5
When the value is 00 or higher, the falling speed of the yarn coil increases (because the downward minute velocity increases), and the coil becomes disordered and collapses before it lands on the stacked coil in the can. Furthermore, since the ejected airflow also flows downward, the falling coil is disturbed, resulting in troubles such as tangles of the yarn when being drawn out in the subsequent process. In the embodiments (FIGS. 1, 2, and 3), the shape of the outlet 6b of the conduit is shown to be of equal width and sloped downward toward the rear wall surface. In this case, as is clear from FIGS. 3 and 4, the positions of the ejected air flow and the discharge thread in the height direction are also shifted, which is preferable in terms of air separation, but the shape of the discharge port 6b is It is not necessarily limited to the example. In order to more reliably separate the ejected air flow from the yarn, the width of the discharge port 6b in a portion close to the front wall surface 6e may be increased. As described above, according to the present invention, pressure fluid is contained within the conduit. Since the thread and the thread are separated, the thread is not affected by the swirling flow, so the thread does not get tangled and block the conduit, and the direction in which the pressure fluid is ejected is different from the direction in which the thread coil falls. This allows stable coil formation without disturbing the yarn coil, expanding stable operating conditions.
Ru.

Furthermore, since the yarn guiding surfaces (rear wall surface, bottom wall surface) of the guide path are formed so as to follow the yarn locus, the yarn runs smoothly and abnormal abrasion can be avoided, thereby preventing damage to the yarn. can. From the viewpoint of device manufacturing, since the guide path is formed in a cylindrical body, the guide path can be easily formed by machining, and the surface of the guide path can be processed, which improves the durability of the device. It also has advantages such as:

Next, the method of the present invention will be explained.

The method of the present invention is characterized in that a fluid ejector, a yarn inlet opening coaxially with the vertical axis which is located below the fluid ejector, and a yarn outlet opening in the circumferential direction are connected to each other, and the yarn has a radially flared shape. having a thread guiding path, the rear wall surface of the thread guiding path receding in the circumferential direction according to the distance from the center;
Standard take-up speed ■1 The yarn is taken up at a standard rotational speed ω1, and when the yarn is deposited in a coil shape, the yarn is deposited in a coil shape using a coiler designed so that the yarn is discharged in contact with the rear wall surface. This yarn take-off method is characterized by setting the yarn take-off speed V and the coiler rotation speed ω within the following ranges when drawing out and taking off.

However, at ω1 and V1, the yarn just touches the rear wall of the coiler,
The coiler rotation speed and yarn take-up speed are shown respectively at the time of discharge.

As mentioned in the description of the apparatus of the present invention, it is desirable that the yarn bundle is caused to run along the rear wall surface of the guide path in the coiler head, and the shape of the guide path is adjusted by setting the reference take-up speed and reference rotation speed. By forming the shape as shown, the take-up speed V1
, when the rotation speed is ω1, the tow approximately runs along the rear wall surface.

The device of the present invention does not take into account friction between the tow and the guideway, centrifugal force, etc., but in some cases, the shape of the rear wall of the guideway may be determined by experiment etc. at the reference take-up speed 1, reference rotation speed, etc. ω
1, the tow can also be formed to run completely along the rear wall surface. When tow is collected by coiler motion, depending on the spinning conditions of the tow, the properties of the tow, the oil agent, the collection conditions (diameter of the yarn coil, diameter of the coil formed by the rolled-out tow), etc. Actual operating conditions are always reference speed V
1, ω1 cannot be maintained.

The method of the present invention was devised in view of the above points, and the actual taking-up conditions were studied, and the ratio of the taking-up speed V to the rotational speed ω was determined to be the ratio ω1/V under the condition that the yarn was just in contact with the rear wall surface.
By stipulating this for 1, stable collection is possible.

That is, as mentioned above, the actual speed ratio m (W, /V,)
Keep within the range of ≧w/■≧±(W, /V,)
1.1. Good collection can be achieved.

In the case of ham W1/V1, the friction between the yarn and the rear wall surface becomes large and the yarn is damaged, causing trouble during yarn drawing in the subsequent process. Also, w/■ku-1AW1/V1
In this case, the tow coil diameter becomes larger than the optimum value and at the same time the stability of the tow coil decreases, resulting in a poor storage condition of the tow coil and causing trouble when pulling out the tow in the next process. By setting the take-off conditions as described above, it is possible to form and accumulate stable coils, but in actual take-off, the influence of the oil adhering to the tow is not small.

As a result of studying the adhesion conditions for this oil, it was found that by selecting these conditions, troubles in the subsequent process of drawing the tow can be reduced and stable tow can be taken off. That is, the oil adhesion rate (weight %) after collection is 0. P. U. 0.10~0
．． While maintaining the oil emulsion (weight %) in the range of 50%, E. P. U. (%) and the above 0. P
．． U. (%) is 40×10 −5 or more, the stability in taking-off and the process stability in the subsequent process (stretching) will be good.

Note that the oil emulsion adhesion rate (%) during stretching is usually slightly (0 to
2%) is a low value. Here, 0. P. U. is 0
．． If it is less than 10%, the tow is likely to be damaged when passing through the coiler head, resulting in yarn breakage in the subsequent process, and if the tow is less than 0. P. U. If it is 0.50% or more, when the tow is taken off, oil scum will adhere to the tow passage, making it impossible to take off the tow stably. In addition, the amount of oil splashing increases, resulting in large losses of oil. Also, E. P. U. Regarding E.
．． P. U. If the E. P. U. If it exceeds 10%, the tow take-up ability (due to an increase in the load on the fluid ejector) decreases.
Furthermore, 0. P. U. (%), E. P. U. (%) is 0.
P. U. /100XE. P. U. /100<4.0×1
If it is 0-5, even if there is no trouble at the time of collection,
This is not preferable because thread breakage tends to occur during stretching.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of a yarn collection device using one embodiment of the present invention, FIG. 2 is a perspective view of its coiler head, FIG. 3 is a perspective view of a yarn guide path, and FIG. The figure shows the velocity distribution of the ejection pressure air, Figure 5 is a vertical projection of the coiler head showing the vertical projection locus of the guideway, Figure 6 is its horizontal projection, and Figures 7 and 8 are the coiler head guideway. FIG. 3 is a horizontal projection view of another embodiment of the invention. 2 is an ejector, 7 is a coiler head, 6 is a yarn guide path, 6
a Inlet, 6b Outlet, 6c Rear wall, 6d Bottom wall, 6e
Front wall, 6f upper wall.

Claims (1)

[Scope of Claims] 1. A fluid ejector, and a three-dimensional curved structure that is located below the fluid ejector, is rotatable about a vertical axis, and connects a yarn inlet that opens coaxially with the vertical axis and a yarn outlet that opens in the circumferential direction. In a yarn take-up device that is equipped with a coiler having a thread guiding path and depositing yarn in a coil shape, the yarn guiding path is formed in a radial shape that widens at the end, and the shape of the rear wall surface of the guiding path is lowered. A yarn take-up device characterized in that it satisfies the formula. 1/0.6(ω_0/V_0)・S・R≧L≧1/1.
1(ω_0/V_0)・S・R However, L = the distance from any point on the projection radius of the vertical projection trajectory (the virtual trajectory that the thread passes when the coiler is stationary) on the horizontal plane to the horizontal projection line on the rear wall surface. Circumferential distance (MM) S = Distance from the center (vertical axis) measured along the vertical projection locus (MM) R = Corresponds to the above S of the rear wall surface projected on the horizontal plane (plane perpendicular to the vertical axis) Distance from point to center (vertical axis) (MM) V_0 = Set yarn take-up speed (MM/SEC) ω_0 =
Set rotational speed of the coiler (radian/SEC) 2 In the projected locus of the bottom wall surface of the yarn guide with respect to the vertical plane including the vertical axis, the radius of curvature ρ of the deflection portion from the vertical introduction part to the outer circumferential direction and the discharge port The yarn take-up device according to claim 1, wherein the angle θ between the tangent line and the horizontal plane satisfies the following range. p≧30MM50゜≧θ≧5゜3 The inner surface of the yarn guide path is coated with ceramic coating or diamond coating with a surface roughness of 0.5^S to 5^S, as described in claim 1 or 2. Yarn take-off device. 4. The yarn take-up device according to claim 3, wherein the discharge port is opened such that the upper wall surface of the yarn guide path is located above the turning point of the bottom wall surface.