JPH101832A - Simultaneous sz false-twisting disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk for the simultaneous SZ false-twisting capable of stabilizing the twist. SOLUTION: A ring-shaped elastic member 5 forming a 1st friction face 11 and a 2nd friction face 12 is fixed to both side faces of the outer circumference of a disk 4 and a pair of yarns Y1 and Y2 are false-twisted with the 1st friction face 11 and the 2nd friction face 12 in opposite twisting directions. In the simultaneous SZ false-twisting disk having the above structure, each of the 1st friction face 11 and the 2nd friction face 12 is formed in a convex form with a radius R.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc for SZ simultaneous false twisting suitable for SZ simultaneous false twisting, and more particularly to a disc capable of uniformizing the contact pressure on a yarn.

[0002]

2. Description of the Related Art As a false twisting machine, S is applied to each of two yarns.
After twisting and false twisting of Z twist, SZ is wound and wound.
There is a simultaneous false twisting machine. A non-torque yarn in which the torque of the S twist yarn and the torque of the Z twist yarn cancel each other is obtained, the unwinding property of the yarn and the handling of the yarn are improved, and it is expected that the operating speed in the subsequent process will be improved and the number of stops will be reduced.

[0003] Such an SZ simultaneous false twisting machine is configured by separately arranging a false twisting device for performing S twisting and a false twisting device for performing Z twisting. As a typical example of such a false twist device, there is known a device in which a pair of belt members are arranged in an intersecting manner and run in the opposite direction, and the yarn is false-twisted at a contact surface (nip surface) at the intersection.

However, when separate false twisting devices are arranged adjacent to each other, the size of the false twisting machine increases. Therefore, a ring-shaped elastic member that forms a first friction surface and a second friction surface is fixed to both side surfaces of the outer periphery of the disk, and a pair of elastic members is provided for each of the first friction surface and the second friction surface. It has been proposed to use a compact false twist device in which the false twist member is disposed.

An example of such a false twist device will be described with reference to FIG. In the figure, the false twist device includes an SZ simultaneous false twist disk 101, a first false twist member 2, and a second false twist member 3. The SZ simultaneous false twisting disk 101 has a first friction ring member 103 and a second friction ring member 104 disposed on both sides of the outer periphery of a disk 102. The first false twisting member 2 and the second false twisting member 3 have the same configuration, and an endless belt member 23 is wound between a driving pulley 21 and a driven pulley 22. The belt member 23 of the second false twist member 3 and the tangential direction of the second friction ring member 104 are arranged so as to intersect at an angle θ. This second friction ring member 104 rotates in the direction of arrow 51, and
Travels in the direction of the arrow 52, so that the crossing portion becomes a contact surface (nip surface) that moves in the opposite direction to each other, so that the yarn can be twisted. Note that the first false twist member 2 has the same arrangement. Then, along the bisector of the angle θ, a pair of yarns Y1 and Y2 are in contact with each other as shown by an arrow 53 (nip surface).
, The yarn Y1 is S-twisted, the yarn Y2 is Z-twisted, and the yarn is twisted at a position off the SZ simultaneous false twisting disc 101 to form a single yarn Y3 in the direction of arrow 54. Drawn out.

[0006]

The false twist device using the SZ simultaneous false twist disk 101, the first false twist member 2 and the second false twist member 3 has a compact equipment configuration. According to the device, there is an excellent characteristic that the running path of the yarn is simplified. However, as compared with a normal false twisting device in which the belt members 21 of the first false twisting member 2 and the second false twisting member 3 are arranged crosswise, twisting is likely to be unstable,
It turned out that there is a limit on the number of twists.

The present invention has been completed by finding that the shape of the friction ring member of the SZ simultaneous false-twisting disk is particularly important in pursuing the cause of such instability of twist. Yes, SZ that can stabilize twist
An object is to provide a disk for simultaneous false twisting.

[0008]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, a first friction surface and a second friction surface are formed on both side surfaces of an outer periphery of a disk. An SZ simultaneous false twisting disk in which a ring-shaped elastic member to be fixed is fixed, and false twists in opposite directions are applied to the pair of yarns on each of the first friction surface and the second friction surface. Further, each of the first friction surface and the second friction surface of the elastic member has a convex shape. A pair of false twist members are disposed so as to be able to abut against each of the first friction surface and the second friction surface, and the abutting surfaces (nip surfaces) apply false twist in the opposite direction to the pair of yarns. Although the false twist member is more likely to bend and the contact pressure on the contact surface is more likely to be non-uniform than the disk, the first twist member is considered in advance in consideration of the warp of the false twist member.
When each of the friction surface and the second friction surface has a convex shape, the contact pressure becomes uniform. A typical example of the false twist member is a belt member, but the belt member is wound around a pair of pulleys so as to contact the first and second friction surfaces.
Although the belt member escapes and the contact pressure on the contact surface is likely to be unstable, the first and second friction surfaces having a convex shape complement the escape of the belt member to ensure a uniform contact surface. That is, it is preferable that the degree of the convex shape of the first and second friction surfaces is such that the deformation of the false twist member paired with the friction surface is compensated.

According to a second aspect of the present invention, in the first aspect, a pair of belt members can contact each of the first friction surface and the second friction surface, and The width of the friction surface and the width of the second friction surface are substantially the same as the width of the belt member. Thus, the friction surface and the contact surface of the belt member have a balanced shape.

The invention of claim 3 is the first or second invention.
In the above, the elastic member has a concave cross section that fits on the outer periphery of the disk. This facilitates positioning of the elastic member with respect to the disk.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of the disk for simultaneous false twisting of SZ of the present invention, and FIG. 2 is a diagram showing the operation of the disk for simultaneous false twisting of SZ of the present invention.

In FIG. 1, (a) is a sectional view of a disk 1 for simultaneous false twisting of SZ, and (b) is a side view of the disk 1 for simultaneous false twisting of SZ. The SZ simultaneous false twisting disk 1 includes a disk 4 and an elastic member 5 having a concave cross-section fixed to the outer periphery of the disk 4 in a fitted state. The disk 4 is formed of a rigid body such as a metal disk, and the elastic member 5 is formed of an elastic body such as synthetic rubber or natural rubber. The disk 4 and the elastic member 5 are fixed by baking, bonding or fitting by a concave cross section.

A portion of the elastic member 5 along both sides of the outer periphery of the disk 4 serves as a first friction surface 11 and a second friction surface 12. The first false twist member 2 is disposed on the first friction surface 11 and the second false twist member 3 is disposed on the second friction surface 12 to constitute a false twist device. The configurations of the first false twisting member 2 and the second false twisting member 3 are the same as those described with reference to FIG. 6, and are denoted by the same reference numerals and description thereof will be omitted.

In particular, the first friction surface 11 and the second friction surface 12
Is not a flat surface parallel to the disk 4 but a convex shape having a curved surface with a radius R. This convex shape is a disk 4
Is formed symmetrically on the left and right sides of the center in the thickness direction, for example, by polishing a grindstone 13 having a concave shape. In the illustrated example, the elastic member 5 is fixed to the disk 4 by baking. Disc 4 was prepared by preforming raw rubber into a concave cross section.
And vulcanization by heating and pressurization and baking to the disk 4 are performed. After that, the first friction surface 11 and the second friction surface 12 are formed by polishing with a grindstone 13. Further, both the inner peripheral surface 55 and the outer peripheral surface 56 of the elastic member 5 are processed by a grinder to be shaped into an elastic member 5 having a predetermined inner and outer diameter and a predetermined width W1. When the cross section is concave, the processing of the outer peripheral surface 56 is also easy.

The distance δ between the outer peripheral surface 56 of the elastic member 5 and the outer peripheral surface of the disk 4 is preferably as small as possible. This is because the first friction surface 11 and the second friction surface 12 can be reliably processed. Therefore, the dimension of each member is adjusted so that δ is 0.5 to 2 mm.

FIG. 1B shows a disk 1 for SZ simultaneous false twisting and a first disk.
3 shows a false twist device using a combination of the first and second false twist members 2 and 3. It is preferable that the width W2 of the belt member 21 of the first and second false twist members 2 and 3 is substantially the same as the width W1 of the elastic member 5. The arrangement relationship between the yarns Y1, Y2, Y3, the SZ simultaneous false twisting disk 1, and the first and second false twist members 2, 3 is the same as that described with reference to FIG. Detailed description is omitted.

Next, the operation of the SZ simultaneous false twisting disk 1 will be described with reference to FIG. Belt member 21 of first false twist member 2 against first friction surface 11 of SZ simultaneous false twist disk 1
Are crossed and contacted to form a first contact surface (nip surface) 14. Similarly, the belt member 21 of the second false twist member 3 crosses and abuts on the second friction surface 12 to form a second abutment surface (nip surface) 15. Although the belt member 21 is stretched between the pulleys 22 and 23 with a predetermined tension, there is no support in the middle, so that the belt member 21 is bent. Since the first friction surface 11 and the second friction surface 12 have a convex shape with a radius R so as to complement this bending, the contact pressure between the first contact surface 14 and the second contact surface 15 is reduced. Variation is reduced. As a result, the yarn twisted with the first contact surface 14 and the second contact surface 15 undergoes stable twisting.

That is, the first friction surface 11 and the second friction surface 1
Preferably, the convex shape of 2 is determined according to the deformation of the pair of false twist members. When the two pulleys 22 and 23 are long or the tension of the belt member 21 is low, the convex shape becomes more protruding. When the deformation of the false twist member is small, the convex shape is small. The convex shape may be any shape that complements the bending of the false twist member, and is not limited to the arc shape having the radius R, and may be a parabolic shape, an elliptical shape, or a mountain shape.

Further, as shown in FIG.
Since the width W1 of the friction surface 11 and the second friction surface 12 and the width W2 of the belt member 21 of the first and second false twist members 2 and 3 are substantially the same, the contact surfaces 14 and 15 have a shape approximate to a rhombus. Becomes For this reason, it is possible to prevent shortage of twisting due to the width W1 being too small, and to prevent a reduction in the life of the belt member 21 due to the width W1 being too large.

Next, a false twist device 31 for combining the SZ simultaneous false twist disk 1 with the first and second false twist members 2 and 3 will be described.
An example of equipment arrangement of a false twisting device using the method will be described with reference to FIG.
The yarn Y1 from the first POY and the yarn Y2 from the second POY are
It is pulled out by the first feed roller FR1. Between the first feed roller FR1 and the second feed roller FR2,
From the downstream side, the heater H1 and the false twist device 31 are arranged in order. Note that the peripheral speed of the second feed roller FR2 is faster than the peripheral speed of the first feed roller FR1, and the sheet is stretched during this period. Yarn Y up to false twisting device 31 and first feed roller FR1
1 and Y2 are in a twisted state, and the twist is thermally fixed by the heater H1. False twisting device 31 and second feed roller FR
The yarns Y1 and Y2 up to 2 are untwisted and are pulled out by the second feed roller FR2 while being combined with one yarn. Then, the two yarn filaments are entangled by the nozzle I / L to form a single yarn Y3, which is wound into DTY. As a result, a completely non-torque yarn in which the S-twisted yarn and the Z-twisted yarn completely cancel the torque is obtained.

[0021]

EXAMPLE The performance of the SZ simultaneous false twisting disk was confirmed using a false twisting machine as shown in FIG. Using a 150d / 36f yarn, the drawing false twist was performed under the conditions that the yarn speed was 800 m / min and the speed ratio between the first feed roller FR1 and the second feed roller FR2 was 1.60. The material of the elastic member 5 was a synthetic rubber having a width W1 = 8 mm and a diameter of 178 mm. First and second paired with the elastic member 5
The material of the belt members 21 of the false twist members 2 and 3 was synthetic rubber, and the width W1 was 8 mm and the thickness was 1.6 mm. The intersection angle θ between the tangential direction of the elastic member 5 and the belt member 21 was 105 °.

As an example of the present invention, the first member
A friction surface 11 and a second friction surface 12 having a convex shape with a radius R = 40 mm were used. As a comparative example, a first friction surface 11 and a second friction surface 12 of the elastic member 5 were flat. .

Then, VR (running speed of belt member 21 / peripheral speed of second feed roller FR2) is set to 1.42 to 1.42.
When changing to 1.57, the results of the yarn untwisting side tension (T ₂ tension) was examined how such changes is shown in FIG. For Comparative Example remained T ₂ tension is high, T ₂ tension is not so much decreased even by increasing the VR. On the other hand, in the case of the present invention, VR =
T ₂ tension even 1.42 is dropped to nearly 70% in the conventional example, T ₂ tension by increasing the VR decreases abruptly, it is reduced to about 30% of VR = 1.57 in the prior art . The fact that changes in the VR with T ₂ tension decreases means that the stable twist is at stake. Incidentally, the characteristics in the case of the conventional false twisting device in which the belt members are crossed are shown by dotted lines, and are approximately the same as those of the present invention.

Similarly, the above-mentioned VR is changed to 1.42.
FIG. 5 shows a result of examining how the number of twists (number of twists per meter) changes when the number of twists is changed to 1.57. In the case of the comparative example, the number of twists is 2500 to 265
In the case of the present invention, the number of twists increases from 2800 to 3100 with an increase in VR, while the number of twists does not increase so much even when VR is increased.

As described above, the first friction surface 1 of the elastic member 5
It can be seen that the slightly convex shape of the first and second friction surfaces 12 greatly changes the performance of the SZ simultaneous false twisting disk.

[0026]

As described above, according to the first aspect of the present invention, the convex shape capable of complementing the bending of the false twist member (for example, the belt member) abutting on each of the first and second friction surfaces. As a result, the contact pressure on the contact surface for imparting twist to the yarn becomes uniform, and a stable strong false twist can be imparted. Specifically, the untwisting side tension (T2 tension) decreases,
The number of twists can be increased, and the occurrence of untwisted portions can be reduced.

According to the second aspect of the present invention, in addition to the effect of the first aspect, the width of the first and second friction surfaces is too small with respect to the width of the belt member, and the twisting ability is reduced or too large. In this case, it is possible to prevent the life of the belt member from being shortened due to excessive friction.

According to the invention of claim 3, in addition to the effect of claim 1 or 2, the elastic member can be easily fixed to the outer periphery of the disk,
An SZ simultaneous false twist disk with excellent accuracy can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a disk for simultaneous false twisting of SZ of the present invention.

FIG. 2 is a view showing the operation of the disk for simultaneous false twisting of SZ of the present invention.

FIG. 3 is a view showing a device configuration of a false twisting machine using an SZ simultaneous false twisting disk of the present invention.

FIG. 4 is a graph showing the performance of the disk for simultaneous false twisting of SZ of the present invention.

FIG. 5 is a graph showing the performance of the disk for simultaneous false twisting of SZ of the present invention.

FIG. 6 is a view showing a configuration of a conventional disk for simultaneous false twisting of SZ.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 SZ simultaneous false twisting disk 2 1st false twist member 3 2nd false twist member 4 Disk 5 Elastic member 11 1st friction surface 12 2nd friction surface 14 1st contact surface 15 2nd contact surface 21 Belt member

Claims (3)

[Claims] 1. A first friction surface and a second friction surface on both sides of an outer periphery of a disk.
A ring-shaped elastic member forming a friction surface is fixedly provided, and a false twist in an opposite direction is applied to a pair of yarns in each of the first friction surface and the second friction surface. A twisting disk, comprising: a first friction surface of the elastic member;
SZ characterized in that each of the friction surfaces has a convex shape.
Disk for simultaneous false twisting. 2. The friction member according to claim 1, wherein a pair of belt members can contact each of the first friction surface and the second friction surface, and the first friction surface and the second friction surface of the elastic member. SZ having a surface width substantially equal to the width of the belt member
Disk for simultaneous false twisting. 3. The SZ according to claim 1, wherein the elastic member has a concave cross section that fits on the outer periphery of the disk.
Disk for simultaneous false twisting.