JP2002060137A - Double roller - Google Patents

Abstract

(57) [Abstract] (Modified) [Problem] To unwind a yarn from a package in which natural fibers, semi-synthetic fibers, synthetic fibers, etc. are wound by a length-removing method (polarized feeding method), and supply the yarn. To control the fluctuation of the tension and to keep the yarn supply amount constant over time as a substantially uniform tension. A yarn (10) is unwound from a package (6) by a length-removing method, and the unwound yarn (10) passes through a balloon converging guide (7) for converging a balloon generated with the unwinding, and is driven by a double roller (8). It is wound around a small-diameter roller 3 provided on a large-diameter roller 2 and sent to a line device roller 9.
The yarn 10 is wound from the upper part of the double roller 8 so as to contact all of the small-diameter rollers 3, and
Has been sent to The winding may be a single winding or a plurality of windings.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double roller.

[0002] More specifically, natural fibers, semi-synthetic fibers,
The present invention relates to a double roller used when supplying synthetic fibers and the like.

[0003]

2. Description of the Related Art When manufacturing stretchable laminates such as composite elastic yarns, stretchable fabrics, and disposable diapers using synthetic fibers and the like having unique properties with an elongation of 100% or more, they are rotated in a package state. An aggressive delivery system in which a yarn is fed with a uniform unwinding tension using a yarn speed ratio is employed.

However, when the yarn in the package is consumed because the yarn is rotated while being wound around the package, the device for supplying the yarn is stopped, and the yarn end is replaced with a new package. It is necessary to reconnect, and the operation rate of the apparatus is reduced, which adversely affects the product yield.

[0005] As a method of switching to a new package without stopping the apparatus, a transfer tail yarn is provided in the innermost layer portion, tied to the yarn end of the outermost layer portion of the new package, and the yarn is supplied in a vertical removal system ( Yarn feeding).

[0006] However, when unwinding a yarn from a package by using a vertical picking method (a negative feeding method), a synthetic fiber or the like having a unique property of elongation of 100% or more is used.
It is difficult to supply the yarn with a uniform unwinding tension at any position of the outer layer portion, the middle layer portion, and the inner layer portion of the package. In particular, when wound around a cylindrical paper tube with a winding amount of 1 kg or more, the unwinding tension for each layer of the package differs greatly.
When the average value of the unwinding tension of the inner layer portion of the package and the average value of the unwinding tension of the outer layer portion change or increase, the yarn is supplied to the device in a state where the yarn length or the yarn thickness is different. Is done.

For example, when a synthetic fiber or the like having an elongation of 100% or more is placed on a core using a covering machine, a twisting machine, or a spinning machine, uniform twist is imparted, and the core is used as a composite yarn. It is difficult to arrange.

When a yarn is directly incorporated into a fabric, for example,
When knitting knits, circular knits, stockings, and other yarns with stretchable synthetic fibers and other yarns, uneven knitting length impairs uniformity of the dough quality, and should be accurately placed on the front and back of the dough The stretchable synthetic fiber or the like,
The result is irregular placement.

[0009] When synthetic fibers having elasticity are incorporated between a film and a nonwoven fabric for the purpose of obtaining a stretchable laminate, for example, a gather of paper diapers, gather unevenness is caused by unevenness in the unwinding tension of the synthetic fibers. become.

As described above, it is difficult to supply a yarn such as a stretchable synthetic fiber from a package to a device in a length-taking system from the viewpoint of the quality of the obtained product.

Conventionally, as a technique for supplying a yarn in a vertical pick-up system, a yarn tension sensor for adjusting the amount of a yarn is provided, and a yarn supply wheel is driven by a step motor to supply the yarn with a constant tension. A yarn device is disclosed (see, for example, German Patent No. 3,824,034).

There is also disclosed a yarn feeding speed that is automatically changed according to the yarn output tension and yarn is fed with a uniform tension (see, for example, Japanese Patent Application Laid-Open No. H11-314840).

However, the prior art requires a low-load motor of 24 to 40 volts and 35 watts for driving the tension correcting wheel and a power supply unit for controlling the tension sensor, and the thickness of the yarn to be supplied is large. Saga 20
When the thickness is from 0 decitex to 2200 decitex, the load applied to the low-load motor is large, and there is a problem that the long-term durability is poor.

Further, when the yarn is stopped due to a yarn feeding trouble, the yarn between the package and the tension correcting roller is pulled, and when the tension of the yarn is increased, the sensing portion of the tension sensor is electrically operated to reduce the tension so that the tension is released. Since the correction roller is excessively rotated, the yarn is wound around the tension correction roller, and there is a problem that the yarn breaks.

In order to prevent such troubles, when starting from a stopped state, it is required to loosen the thread between the package and the tension correcting roller and adjust the input tension / output tension of the tension sensor, and the preparation work is required. It required skill.

Furthermore, a low-load motor is required for each of the yarns to be supplied, and the switches of the low-load motors need to be turned on, off and on at the time of threading.
Then, when a slight change in the thread tension is detected, the contact turns on.
Because of the delicate design of turning off, the sensing lever is thin, and if a thread having a thickness of 200 dtex or more is caught, it may be broken.

In the case where the yarn is supplied only by a roller rotating at a constant speed without using the tension correction roller as described above,
There has been a problem that the yarn may be wound around the roller due to the friction of the yarn, or even if a matte finish is applied to reduce the frictional resistance, the yarn may break due to the winding around the roller.

[0018]

The double roller according to the present invention unwinds a yarn from a package in which natural fibers, semi-synthetic fibers, synthetic fibers, etc. are wound by a vertical picking method (a negative feeding method). In this case, it is an object of the present invention to suppress the fluctuation of the tension and to make the yarn supply amount constant with time with a substantially uniform tension.

That is, the power supply unit is not always required, the economy is high, and the yarn is not supplied excessively due to the high and low yarn tension at the time of starting the device, and there is no danger of winding the yarn. Further, if the yarn is on the same line, only one roller needs to be attached, and the ON / OFF-ON operation of the switches corresponding to the number of yarns does not need to be performed at the time of threading.

Further, since a delicate sensing lever is not used, a thread having a thickness of 200 dtex or more is not caught and damaged, and the durability is excellent.

Further, since the yarn can be supplied with a uniform tension even by the depolarized feeding method of removing the length, a transfer tail yarn is provided on the innermost layer so as not to overlap the winding layer of the old package. By tying the yarn ends of the outermost layer of the new package in advance, the package can be replaced without stopping the apparatus, and the product yield can be improved.

[0022]

SUMMARY OF THE INVENTION A double roller according to the present invention comprises:
The following means are adopted to solve the above-mentioned problems.

That is, the present invention is a compound roller characterized in that a plurality of small-diameter rollers are provided on a large-diameter roller.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

The double roller according to the present invention comprises a large diameter roller and a plurality of small diameter rollers.

In the present invention, the small-diameter roller is preferably provided outside the large-diameter roller, and is also preferably provided inside the large-diameter roller.

The yarn supplied in the present invention may be any of natural fibers, semi-synthetic fibers, synthetic fibers, etc.
In particular, synthetic fibers having elasticity are preferred. Examples of such synthetic fibers having elasticity include elastic yarns having rubber-like elasticity, and polyurethane elastic yarns and the like are preferable as such elastic yarns. The elastic yarn may be a raw yarn or a processed yarn covered with another inelastic yarn.

[0028] Of these stretchable materials, synthetic fibers having unique properties with an elongation of 100% or more are preferred.

FIG. 1 is a schematic perspective view showing an example of the compound roller of the present invention.

In FIG. 1, a large-diameter roller 2 is provided with a plurality of small-diameter rollers 3. The large diameter roller 2 is rotated by a drive shaft 1 connected to a drive source such as a motor (not shown). The drive shaft 1 is connected to a drive unit of a line device such as a covering machine, a twisting machine, a spinning machine, a knitting machine, a loom, a disposable diaper manufacturing apparatus, to which the yarn is supplied, via a gear, a belt, and the like. , Is preferably configured to transmit torque.

It is preferable that at least one of the small-diameter rollers 3 is rotatable. It is preferable that a ball bearing or the like is used for the base fixed to the large-diameter roller 2 so that the small-diameter roller 3 can rotate smoothly even by friction of the contacting yarn.

It is preferable that the longitudinal direction of the rotating shaft of the small-diameter roller 3 is substantially parallel to the longitudinal direction of the rotating shaft of the large-diameter roller 2.
More preferably, it is parallel to the longitudinal direction of the rotation axis. In the present invention, the rotation of the large-diameter roller 2 and the rotation of the small-diameter roller 3 are combined, but a design is appropriately made so that the mutual rotation does not adversely affect other rotations or cause vibration or the like. Is preferred.

FIG. 2 is a schematic top view showing an example of the compound roller of the present invention. In FIG. 2, 24
A plurality of small-diameter rollers 3 are provided. The small diameter roller 3 is
It is preferably fixed to the large-diameter roller 2, at least one of which is rotatable.

FIG. 3 is a schematic top view showing another example of the double roller of the present invention. In FIG. 3, four small-diameter rollers 3 are provided inside the large-diameter roller 2. Small diameter roller 3
Is fixed to the large-diameter roller 2, and at least one of them is preferably rotatable.

FIG. 4 is a schematic top view showing still another example of the multiple roller of the present invention. In FIG. 4, six small-diameter rollers 3 are provided inside the large-diameter roller 2. The small-diameter roller 3 is fixed to the large-diameter roller 2, and at least one of them is preferably rotatable.

FIG. 5 is a schematic top view showing still another example of the double roller according to the present invention. In FIG. 5, three small-diameter rollers 3 are provided outside the large-diameter roller 2. The small-diameter roller 3 is fixed to the large-diameter roller 2, and at least one of them is preferably rotatable.

FIG. 6 is a schematic top view showing still another example of the compound roller of the present invention. In FIG. 6, three small-diameter rollers 3 are provided inside the large-diameter roller 2. The small-diameter roller 3 is fixed to the large-diameter roller 2, and at least one of them is preferably rotatable.

The small-diameter roller is preferably provided at substantially the same distance from the rotation center of the large-diameter roller, and is preferably provided at a point symmetrical position with respect to the rotation center of the large-diameter roller. It is also preferable that it is provided so as to be located on a circumference around the rotation center of the roller.

The circle around the center of rotation of the large-diameter roller is preferably a perfect circle, or may be an ellipse or an eccentric circle.

The ratio of the diameter of the small diameter roller to the diameter of the large diameter roller is preferably 0.01 or more and 0.45 or less.

The number of small-diameter rollers is preferably 3 or more and 24 or less, more preferably 4 or more.

The length of the small-diameter roller in the longitudinal direction is preferably determined appropriately in consideration of physical properties such as the elongation of the yarn and the like so that the yarn can be easily hooked.

In the present invention, as the material of the large-diameter roller and the small-diameter roller, metal materials such as carbon steel, stainless steel (SUS) and titanium, synthetic resins, ceramics and composite materials are preferably used. In the present invention, a metal material is more preferable from the viewpoint of wear resistance.

In addition, it is also preferable to perform abrasion resistance treatment particularly on the portion where the yarn comes into contact.

From the viewpoint of preventing yarn breakage, the surface of the small-diameter roller is also preferably processed so that the wound yarns do not overlap each other. Specifically, a groove is provided on the surface of the small-diameter roller. This is also preferably performed.

Further, in order to prevent the yarn from being tangled, not only the small-diameter roller is supported from only one direction, but also two large-diameter rollers are used and supported from both sides to maintain rigidity in the double roller. It is also preferable to adopt a structure that allows the thread to be applied, and a means that does not hang on the yarn can be adopted as appropriate.

FIG. 7 is a schematic view showing an example in which yarn is supplied to a line device such as a disposable diaper manufacturing apparatus using the double roller of the present invention. In FIG. 7, the yarn 10 is unwound from the package 6 in a vertical direction, and the unwound yarn 10 passes through a balloon convergence guide 7 that converges a balloon generated along with the unwinding. It is wound around the small diameter roller 3 provided on the diameter roller 2 and sent to the line device roller 9. The yarn 10 is wound from the upper part of the double roller 8 so as to contact all of the small-diameter rollers 3 and sent to the line device roller 9. The winding may be a single winding or a plurality of windings. From the viewpoint of preventing yarn breakage, it is preferable to wind the yarn so that the yarns do not overlap with each other.

The large-diameter roller 2 of the double roller 8 is rotated in the direction along the running of the yarn, and the small-diameter roller 3 is rotated by the friction of the wound yarn. In the present invention, the rotation of the large-diameter roller 2 and the rotation of the small-diameter roller 3 can buffer and reduce the tension fluctuation of the yarn.

Next, an embodiment of the use of the compound roller of the present invention will be described.

In the present invention, it is preferable that the yarn speed of the double roller is higher than the line speed. In the present invention, the yarn speed in the compound roller refers to, for example, in the case of FIG. 7, the circumferential speed at a position where the yarn is in contact with the small-diameter roller 3, and the yarn is moved from the center of the large-diameter roller. It can be calculated from the distance to the position in contact with the small diameter roller and the number of rotations per unit time of the large diameter roller.

The line speed refers to the running speed of the yarn in the line device after the double roller. For example, in FIG. 7, the running speed of the yarn in the line device roller 9 (the rotation speed of the line device roller 9). .

It is preferable that the yarn speed of the double roller is 1.2 to 4.5 times the line speed.

Further, the yarn speed of the double roller is set to 3
It is preferably from 0 to 900 m / min.

By using the double roller of the present invention, even when the unwinding speed is high, the tension fluctuation of the yarn and the tension distribution in the package can be made substantially uniform.

[0055]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments.

The unwinding tension in the embodiment means the tension of the yarn between the double roller 8 and the line device roller 9 in FIG.
The unwinding tension in the comparative example refers to the tension of the yarn between the balloon convergence guide 7 and the line device roller 9 in FIG.

The yarn speed of the double roller in the embodiment is determined by the distance between the position where the yarn is in contact with the small-diameter roller and the center of the large-diameter roller and the rotation speed of the large-diameter roller. It was calculated by actual measurement.

The line speed is controlled by the line device roller 9 shown in FIG.
Was calculated by actually measuring the yarn speed.

In the comparative example, the line speed was calculated as the unwinding speed because the double roller 8 in FIG. 7 was not used.

The method for measuring the unwinding tension in the present invention will be described below. [Unwinding tension] ELECTRO manufactured by ROTHSCHILD
The yarn tension was measured using NIC TENSIOMETER. Example 1 FIG. 1 shows a 4.5 kg wound package of a polyurethane elastic yarn (“LYCRA” (registered trademark of DuPont, hereinafter the same), T127-620 decitex) manufactured by Du Pont-Toray Co., Ltd. to which no oil agent is attached. The yarn was unwound in a vertical direction using the double roller (large diameter: 88 mmφ, small diameter: 5 mmφ) of the present invention, in which the material was stainless steel. The yarn speed of the double roller was 100 m / min, and the line speed was 75 m / min. FIG. 8 shows the result of the unwinding tension.

FIG. 9 shows the histogram.

The fluctuation width of the unwinding tension was very small and stable during yarn feeding. [Example 2] A 4.5 kg wound package of a polyurethane elastic yarn ("LYCRA", T127-620 decitex) manufactured by Du Pont-Toray Co., Ltd. to which no oil was attached was used as the same book as Example 1 shown in FIG. Using the double roller of the invention, the yarn was unwound in a length removing system. The yarn speed of the double roller was 200 m / min, and the line speed was 150 m / min.

FIG. 10 shows the result of the unwinding tension.

The fluctuation width of the unwinding tension was very small and stable during yarn feeding. [Example 3] A 4.5 kg wound package of a polyurethane elastic yarn ("LYCRA", T127-620 decitex) manufactured by Toray Dupont Co., Ltd. to which no oil was attached was used as the same book as Example 1 shown in FIG. Using the double roller of the invention, the yarn was unwound in a length removing system. The unwinding tension fluctuation of the outer layer portion was measured at a yarn speed of 400 m / min and a line speed of 150 m / min in the double roller.

FIG. 11 shows the result of the unwinding tension.

The fluctuation width of the unwinding tension was very small and stable during yarn feeding. Example 4 A 3 kg wound package of a polyurethane elastic yarn (“LYCRA”, T127-620 decitex) manufactured by Toray Dupont Co., Ltd. to which no oil agent was attached,
Using the same double roller of the present invention as in Example 1 shown in FIG. The yarn speed in the double roller is 250 m / min, and the line speed is 15
The unwinding tension of the outer layer, the middle layer, and the inner layer was measured at 0 m / min.

FIG. 12 shows the result of the average value of the unwinding tension. Table 1 shows the minimum value, the maximum value, and the fluctuation rate.

The fluctuation width of the unwinding tension was very small and stable during yarn feeding. [Example 5] A 1 kg wound package of a polyurethane elastic yarn ("LYCRA", T127-940 decitex) manufactured by Toray Dupont Co., Ltd. to which no oil agent was attached,
Using the same double roller of the present invention as in Example 1 shown in FIG. The yarn speed in the double roller is 250 m / min, and the line speed is 15
The unwinding tension of the outer layer, the middle layer, and the inner layer was measured at 0 m / min.

FIG. 13 shows the result of the average value of the unwinding tension. Table 1 shows the minimum value, the maximum value, and the fluctuation rate.

The fluctuation width of the unwinding tension was very small and stable during yarn feeding. Example 6 A 4.5 kg wound package of polyurethane elastic yarn (“LYCRA”, T127-940 decitex) manufactured by Du Pont-Toray Co., Ltd. to which no oil was attached was used as the same book as Example 1 shown in FIG. Using the double roller of the invention, the yarn was unwound in a length removing system. The unwinding tension of the outer layer, the middle layer, and the inner layer was measured at a yarn speed of 250 m / min and a line speed of 150 m / min in the double roller.

FIG. 14 shows the result of the average value of the unwinding tension. Table 1 shows the minimum value, the maximum value, and the fluctuation rate.

The fluctuation width of the unwinding tension was very small and stable during yarn feeding. Example 7 A 1 kg wound package of polyurethane elastic yarn (“LYCRA”, T127-1240 decitex, manufactured by Du Pont-Toray Co., Ltd.) to which no oil was adhered was used in the same manner as Example 1 shown in FIG. Using a roller, the yarn was unwound in a lengthwise manner.The yarn speed of the double roller was 250 m / min, and the line speed was 150.
The unwinding tension of the outer layer, the middle layer, and the inner layer was measured at m / min.

FIG. 15 shows the result of the average value of the unwinding tension. Table 1 shows the minimum value, the maximum value, and the fluctuation rate.

The fluctuation width of the unwinding tension was very small and stable during yarn feeding. Example 8 A 4.5 kg wound package of polyurethane elastic yarn ("LYCRA", T127-1240 decitex, manufactured by Toray Dupont Co., Ltd.) to which no oil was adhered was the same as Example 1 shown in FIG. The yarn was unwound in the vertical direction using a double roller of No. 1. The yarn speed of the double roller was 250 m / min, and the line speed was 150 m / min, and the unwinding tension of the outer layer, the middle layer, and the inner layer was measured.

FIG. 16 shows the result of the average value of the unwinding tension. Table 1 shows the minimum value, the maximum value, and the fluctuation rate.

The fluctuation width of the unwinding tension was very small and stable during yarn feeding. [Comparative Example 1] Toray DuPont polyurethane elastic yarn ("LYCRA", a 4.5 kg wound package with no T127-620 decitex oil agent attached thereto,
The yarn was unwound by a vertical picking-up method without using the double roller of the present invention. The unwinding tension was measured at a yarn unwinding speed of 75 m / min. FIG. 17 shows the result of the unwinding tension.

FIG. 18 shows the histogram.

Since the double roller of the present invention is not used,
The fluctuation width of the unwinding tension was very large, and the measurement was stopped after measuring for 24 seconds to protect the tensiometer. It was unstable during yarn feeding. [Comparative Example 2] A 3 kg wound package of a polyurethane elastic yarn (“LYCRA”, T127-620 decitex) manufactured by Du Pont-Toray Co., Ltd. to which no oil agent is attached,
The yarn was unwound by a vertical picking-up method without using the double roller of the present invention. The unwinding tension of the outer layer, the middle layer, and the inner layer was measured at a yarn unwinding speed of 150 m / min.

FIG. 12 shows the result of the average value of the unwinding tension. Table 1 shows the minimum value, the maximum value, and the fluctuation rate.

Since the double roller of the present invention is not used,
The unwinding tension of the inner layer became higher than that of the outer layer.

[0081]

[Table 1]

[Comparative Example 3] Polyurethane elastic yarn ("LYCRA", T127-940, manufactured by Toray DuPont)
(Decitex), a 1 kg wound package to which no oil agent was adhered was unwound by a length removing method without using the double roller of the present invention. The unwinding tension of the outer layer, the middle layer, and the inner layer was measured at a yarn unwinding speed of 150 m / min.

FIG. 13 shows the result of the average value of the unwinding tension. Table 1 shows the minimum value, the maximum value, and the fluctuation rate.

Since the double roller of the present invention is not used,
The unwinding tension of the inner layer became higher than that of the outer layer. [Comparative Example 4] A 4.5 kg wound package of a polyurethane elastic yarn ("LYCRA", T127-940 decitex) manufactured by Du Pont-Toray Co., Ltd. to which no oil agent is attached, without using the double roller according to the present invention, a vertical picking method. The yarn was unwound. Outer layer at a yarn unwinding speed of 150 m / min,
The unwinding tension of the middle layer and the inner layer was measured.

FIG. 14 shows the result of the average value of the unwinding tension. Table 1 shows the minimum value, the maximum value, and the fluctuation rate.

Since the double roller of the present invention is not used,
The unwinding tension of the inner layer became higher than that of the outer layer. [Comparative Example 5] A polyurethane elastic yarn ("LYCRA" manufactured by Toray DuPont Co., Ltd., T127-1240 decitex) with a 1 kg wound package to which no oil was attached was unwound by the vertical take-off method without using the double roller of the present invention. An outer layer, a middle layer, and a yarn unwinding speed of 150 m / min were used.
The unwinding tension of the inner layer was measured.

The result of the average value of the unwinding tension is shown in FIG. Table 1 shows the minimum value, the maximum value, and the fluctuation rate.

Since the double roller of the present invention is not used,
The unwinding tension of the inner layer became higher than that of the outer layer. [Comparative Example 6] Toray DuPont polyurethane elastic yarn ("LYCRA", 4.5 kg wound package with no T127-1240 decitex oil agent attached thereto, without using the double roller of the present invention, in a vertical picking method The outer layer was unwound at a yarn unwinding speed of 150 m / min.
The unwinding tension of the middle layer and the inner layer was measured.

FIG. 16 shows the result of the average value of the unwinding tension. Table 1 shows the minimum value, the maximum value, and the fluctuation rate.

Since the double roller of the present invention is not used,
The unwinding tension of the inner layer became higher than that of the outer layer.

[0091]

According to the present invention, when unwinding a stretchy yarn package from the package by the warp removal method, there is little fluctuation in unwinding tension, and tension is applied to any part of the outer layer, the middle layer and the inner layer of the package. Since the fluctuation is small and the difference in tension between the outer layer and the inner layer is small, a product of extremely excellent quality can be obtained.

Further, since a power supply unit is not required, the economy is high, and the yarn is supplied excessively due to the level of the yarn tension at the time of starting the line device, and there is little risk of yarn breakage. Further, if the yarns are on the same line, it is only necessary to provide the present invention, and it is not necessary to perform the ON-OFF-ON operation of the switches for the number of yarns at the time of threading.

Since a delicate sensing lever is not used, there is no fear of breakage when a thick thread (200 dtex or more) is caught, and the durability is excellent.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing an example of a compound roller of the present invention.

FIG. 2 is a schematic top view showing an example of a compound roller of the present invention.

FIG. 3 is a schematic top view showing another example of the compound roller of the present invention.

FIG. 4 is a schematic top view showing another example of the compound roller of the present invention.

FIG. 5 is a schematic top view showing another example of the compound roller of the present invention.

FIG. 6 is a schematic top view showing another example of the compound roller of the present invention.

FIG. 7 is a schematic view showing an example of feeding a yarn to a line device using the double roller of the present invention.

FIG. 8 is a schematic diagram illustrating unwinding tension in Example 1.

FIG. 9 is a histogram showing a change in unwinding tension in Example 1.

FIG. 10 is a schematic diagram illustrating unwinding tension in Example 2.

FIG. 11 is a schematic diagram illustrating unwinding tension in Example 3.

FIG. 12 is a schematic diagram showing average values of unwinding tensions in Example 4 and Comparative Example 2.

FIG. 13 is a schematic diagram showing average values of unwinding tensions in Example 5 and Comparative Example 3.

FIG. 14 is a schematic diagram showing average values of unwinding tensions in Example 6 and Comparative Example 4.

FIG. 15 is a schematic diagram showing average values of unwinding tensions in Example 7 and Comparative Example 5.

FIG. 16 is a schematic diagram showing average values of unwinding tensions in Example 8 and Comparative Example 6.

FIG. 17 is a schematic diagram showing an average value of unwinding tension in Comparative Example 1.

FIG. 18 is a histogram showing a change in unwinding tension in Comparative Example 1.

[Explanation of symbols]

 1: Drive shaft 2: Large diameter roller 3: Small diameter roller 4: Fixing screw 5: Bearing 6: Package 7: Balloon convergence guide 8: Double roller 9: Line device roller 10: Yarn

Claims (7)

[Claims] 1. A double roller comprising a large diameter roller and a plurality of small diameter rollers. 2. The duplex roller according to claim 1, wherein at least one of said small diameter rollers is rotatable. 3. The small diameter roller is provided at substantially the same distance from the rotation center of the large diameter roller.
Or the double roller according to 2. 4. The double roller according to claim 1, wherein said small diameter roller is provided at a point symmetrical position with respect to the rotation center of the large diameter roller. 5. The small-diameter roller according to claim 1, wherein a center of the small-diameter roller is located on a circumference centered on a rotation center of the large-diameter roller. Double roller. 6. The double roller according to claim 1, wherein a ratio of a diameter of the small diameter roller to a diameter of the large diameter roller is 0.01 or more and 0.45 or less. 7. The multiple roller according to claim 1, wherein at least three small-diameter rollers and at most 24 small-diameter rollers are provided.