JPS597808B2 - false twisting device - Google Patents

Description

[Detailed Description of the Invention] The present invention was arrived at as a result of intensive studies aimed at improving the productivity of the false twisting process, and is capable of doubling the conventional productivity. A novel false twisting device is provided.

In other words, the conventionally known three-axis friction false twisting device is
While only one yarn can be false-twisted per false-twisting device, with the new false-twisting device of the present invention, two yarns can be false-twisted per false-twisting device. Therefore, productivity can be doubled.

This device has a set of three shafts, each shaft is provided with friction discs so that a portion of the discs overlap, and the three discs form a set, and the yarn is passed through the center of the discs to perform false twisting. Various proposals have been made.

(For example, JP-A-48-99432, JP-A-49-13
No. 457, JP-A-49-14758, etc.

) However, the device processes one yarn with one false twisting device that uses a set of three friction disks,
It is not possible to process two yarns at the same time.

In addition, a false twisting device equipped with one shaft in addition to three shafts is also known, but this device is designed to easily produce S-twist and Z-twist processed yarns, and does not require the need for S-twist or Z-twist. Depending on the required 3
It selects and processes the shaft, and is essentially the same as above.
This is an axially circumscribed false twisting device, and this device also has the problem of being able to process only one yarn.

On the other hand, a 4-axis circumscribed false twisting device was disclosed in Japanese Patent Application Laid-Open No. 50-118052.
However, as shown in Figure 5 of the same publication, two disks face each other in a vertical relationship, and the other two disks are aligned at the same height and do not overlap. In a false twisting device having this configuration, the tension applied to each yarn tends to be inappropriate.

FIG. 4 shows the state of contact between the friction disk of the false twisting device and the yarn, and as shown in FIG. When the yarn 3 does not pass through, the frictional force F between the yarn 3 and the friction disk 1 is f1 and f2.
The arrow 3' in the traveling direction of the yarn 3 and the component force f1
is reversed, and as a result, it acts to prevent the yarn 3 from moving in the traveling direction 3.

This means that a large tension is applied to the yarn 3 during processing, making it difficult for the yarn to be easily transferred.

Note that f2 is the force for twisting the yarn.

FIG. 4B shows the case where the yarn 3 advances at an angle α within the range of the angle A formed between the rotational direction of the friction disk 1 and the shaft 2.
A component force f1 of the frictional force F is an arrow 3' indicating the traveling direction of the yarn 3.
As a result, yarn 3 is easier to transport,
As a result, no abnormal tension is applied to the yarn 3, and a good false twisting process can be performed.

In the false twisting device described in JP-A-50-1180'52, a force acts between two yarns in a direction opposite to the direction in which they travel, as shown in A and B in FIG. Eventually processed 2
There is an extreme difference in yarn tension (twisting, untwisting), number of inserted twists, etc. between yarns during processing, making it virtually impossible to process two yarns, and depending on the yarn quality and processing conditions, There were problems such as breakage and unstable operation.

As mentioned above, in the conventional 4-axis circumscribed false twisting device, the contact angle between the friction disk and the yarn is greatly different between the two yarns, which inevitably causes unevenness in the yarn quality. This makes it extremely difficult to apply it to production machines.

The present invention was obtained in order to eliminate the drawbacks of the conventional apparatus, and is a four-axis machine that can process two yarns at the same time and that can align or change the yarn quality. It is an object of the present invention to provide a circumscribed friction disk type false twisting device.

In order to achieve the above object, the present invention provides a structure in which rotating shafts to which at least one or more friction disks can be attached are arranged so as to form four vertices of a quadrilateral, and the friction disk located at the bottom position is Four or more friction circles are arranged in a stepped manner so that the friction disks overlap each other, one each in a clockwise direction or an adjacent axis in a counterclockwise direction from any one axis on which the plate is attached. The friction disks attached to one set of two opposing shafts of the two sets of two opposing shafts on the two diagonal lines of the quadrilateral are fitted with plates, and the friction disks are attached to one set of two opposing shafts. The friction discs attached to the two opposing shafts of the other pair are arranged so as not to overlap, and the discs of the four shafts are all aligned in the same direction. The present invention is characterized in that, when viewed from the direction in which the yarn travels, the helical direction of the order of the disks that come into contact with the yarn is the same as the rotation direction of the disks.

Examples of the present invention will be described below with reference to the drawings, but the present invention is not limited thereto.

FIG. 1 is a diagram for explaining how to assemble the friction disks, and FIG. 2 is a plan view of the device viewed from above.

FIG. 3 shows one embodiment of another assembly method.

In Figures 1 and 2, to explain how to assemble each friction disk and the arrangement of the four axes, each vertex of the quadrilateral has axes A, B, C,
D are arranged to be rotatable in the same direction, and each shaft is equipped with two friction discs.

First, attach the first friction disk A1 to the A axis, and then sequentially attach B1, C1, and D1 so that they overlap with the adjacent clockwise axes B, C, and D. Attach the fifth friction disk A2 to the A-axis again, and repeat this process.

Friction discs B1 and B attached to the diagonal axes B and D
2, D1, and D2 are friction disks A1, A2, and C that overlap each other and are installed on the other diagonal axes A and C.
1 and C2 do not overlap each other.

In this way, the positional relationship of the four axes and the friction disks are assembled, and the four axes, which can rotate in the same direction, are rotated counterclockwise (in the direction of the arrow in FIG. 2).

The thread is connected to friction disks attached to shafts B, C, and D, and shaft A.
, B, D, and moves in contact with the periphery of the friction disk attached to the disks.

That is, the yarn 10 is in contact with the friction disks attached to the B, C, and D axes, and the yarn 11 is in contact with the friction disks attached to the A, B, and D axes, and both yarns are in contact with the friction disks attached to the A, B, and D axes. False twisted.

As described above, by assembling the friction disks and determining the rotation direction thereof, both the yarns 10 and 11 have a contact angle with the friction disks (the angle between the disk rotation direction and the yarn traveling direction,
α in FIG. 4B is 90° or less, exhibiting a good twisting effect and positive feeding effect, and making full use of the advantages of triaxial circumscribed friction false twisting.

When you want to obtain a false twisted yarn in the S direction, set the friction disk counterclockwise (for example, starting from the A axis, A-)D-
)C-)B-)A...) The rotation direction of the four axes may be set clockwise.

Of course, the first axis need not be limited to the A axis, and any of the four axes may be used as a reference, and the subsequent assembly of the friction disks may be performed in accordance with the above.

FIG. 3 shows another embodiment in which starting from axis D,
One embodiment of the present invention is shown in which a nine-piece combination ends at the D axis, but in this example, the first friction disk that the yarns io, i1 come in contact with and the last friction disk that they come into contact with are fixed coaxially. The relative position of the friction disk in contact with the yarn is substantially the same for yarns 10 and 11, and yarns with more equivalent quality can be obtained.

The yarns that can be processed by the false twisting device of the present invention include general thermoplastic polymers, polyamides, polyesters, polyacrylics, polyolefins, and the like.

Furthermore, the false twisting method can be either the conventional method of false twisting from the drawing system, the method of continuously false twisting undrawn yarn (including highly oriented yarn) after drawing, or the method of false twisting simultaneously with drawing. Applicable.

The four axes of the circumscribed friction false twisting device of the present invention are four axes of a quadrilateral shape.
Although it is placed at the apex, the remaining two axes may be symmetrical or asymmetrical with respect to a line connecting both axes of the overlapping friction disks.

However, a rhombus is preferable as the quadrilateral.

Naturally, the friction discs mounted on the shafts located at the vertices of the shorter diagonals overlap.

The material of the friction disc may be any material with a high coefficient of friction, but
Particularly preferred are rubber-based, ceramic-based, and metal-based.

Further, these materials made of different materials may be combined as desired.

There are various methods of threading the four-axis friction disk type false twisting device of the present invention, and for example, the following method can be used.

(1) The shafts (axes A and C) equipped with friction discs that do not overlap each other have a structure that can be opened and closed to the left and right.

(2) Create a structure in which the quadrilateral formed by the four axes can be made similar in size.

(3) Other threading methods generally used in 3-axis circumscribed false twisting devices are also possible.

Since the false twisting device according to the present invention is configured as described above, it has the following effects.

(a) Two yarns can be independently processed at the same time per false twisting device equipped with friction disks on four axes.

Because of this, it is possible to process and produce two yarns in one unit, which is highly efficient and productive compared to conventional equipment, and can significantly reduce costs.

(Example) The two yarns that are processed simultaneously and independently are each processed using a 3-axis circumscribed false twisting device. sex)
This method is superior to other friction false twisting methods, and produces good textured yarn with less damage.

In addition, in the 4-axis false twisting device proposed in JP-A No. 50-118052 mentioned above, a good textured yarn can be obtained from one yarn (Fig. 4B), but when the other yarn is In this case, the contact angle between the yarn and the friction disk is 90° or more (Fig. 4A), the feeding effect is not exhibited, and the tension of the yarn coming out of the false twisting device becomes extremely high, resulting in triaxial false twisting. The advantages of the device are not utilized at all, and on the contrary, even threading becomes difficult.

In this sense as well, the 4-axis false twisting device according to the present invention has two
Both yarns can be processed by taking full advantage of the advantages of the triaxial false twisting device, and two good quality processed yarns can be obtained at the same time.

Example 1 Take-up speed 3 0 0 0 m/min (7) 1 4 2D
-36F undrawn yarn was processed simultaneously and independently into two yarns under the following conditions using the false twisting device of the present invention illustrated in FIG.

Processing method: Stretching and simultaneous false twisting Processing speed: 600 m/min Stretching ratio: 190 times False twisting device A 4-axis circumscribed device was used, and 8 friction disks were made of urethane rubber.As a result of processing under the above conditions, a 75D- 3
Two good textured yarns of 6F were obtained at the same time.

Yarn 10 Yarn 11 Number of twists 3480T/H 3420T/H Fluff 0/I
OOOOM O/IOOOOOM Untwisting None None Strength 4.3 g/d4.3 g/d Elongation 23% 22% Twisting direction Z direction Z direction The fuzz measurement was performed using a fuzz counter L-DT1 manufactured by Higashi Hm.
04-01 was used.

Example 2 Under the same conditions as in Example 1, using the four-axis false twisting device of the present invention shown in FIG. 3, two equivalent yarns as shown below were simultaneously obtained.

Yarn 1 Yarn 2 Number of twists 3 5 1 0 T/M 3 5 0 0 T
/M fluff 0/IOOOM O/IOOOM untwisted
None None None Strength 4.1 g/d 4.1 g/d Elongation 22% 22% Twisting direction 2 2 The processed yarn obtained by the false twisting device of the present invention can be processed using a 3-axis circumscribed friction disk type false twisting device. Not only can products with similar properties be obtained, but also the productivity is extremely high because two yarns can be processed at the same time with the device of unit (1).

In addition, compared to conventional equipment, there are fewer parts such as shafts, friction discs, and drive systems, so it has been confirmed that the manufacturing cost of the equipment is lower, and it is also superior in operability and maintainability. .

Comparative example Take-up speed 3000m/min (7) 142D-36F
(7) Undrawn yarn as shown in JP-A No. 48-99432, Fig. 4
Using the four-axis frictional false-twisting device described in 2003, the friction disk was rotated in a clockwise direction to stretch and false-twist the two yarns at the same time.

Processing conditions Processing speed 400m/min Stretching ratio: 1.80x 6 friction discs (made of urethane rubber) The processing results were as follows.

Yarn A is processed in the state shown in FIG. 4B of the present invention, and yarn B is processed in the state shown in FIG. 4A of the present invention.

Ten attempts were made to contact the false twisting heater (210° C., 1.5 m) for heat setting, but all yarns B were cut.

Therefore, we measured and compared the tension before and after the friction false twisting device (twisting/untwisting) without contacting the heater, and found that yarn B had extremely low twisting tension and extremely high untwisting tension. I know that there is.

That is, it can be seen that yarn A can be processed in a desirable state, but yarn B is nearly impossible to process due to abnormal tension.

In this way, the false twisting device disclosed in JP-A-48-99432, Fig. 4, cannot process two yarns at the same time.

Furthermore, when the direction of rotation of the disk is reversed, that is, when the direction of the clock hands is reversed, yarn A cannot be processed and yarn B can be processed, contrary to the above result. As a result, two yarns cannot be processed at the same time.

[Brief explanation of drawings]

FIG. 1 is a side view showing the main parts of the four-axis circumscribed false twisting device of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a side view showing the main parts of the device showing another embodiment. FIG. 4 is an explanatory diagram showing the relationship between the contact angle and the component force between the thread and the friction disk. 1...Friction disk, 2...Shaft, 3...
... Yarn, A, B, C, D... Shaft, AH e
A2 m B1 t B2 + Cl rC2,D1
, D2... Friction disk.

Claims (1)

[Claims] 1 Rotation axes to which at least one or more friction disks can be attached are arranged so as to form at four vertices of a quadrilateral, and clockwise from any one axis to which the friction disk located at the bottom position is attached. Four or more friction disks are attached to adjacent shafts in the direction of or in the counterclockwise direction so that the friction disks overlap each other in a step-like manner, and Of the two sets of opposing two shafts on the two diagonal lines of the shape, the friction discs attached to the two opposing shafts of one set are arranged so as to overlap each other, and the friction disks of the other set are The friction discs attached to the two opposing shafts are arranged so that they do not overlap, and the discs on the four shafts are all rotated in the same direction, and when viewed from the direction in which the yarn travels, A false-twisting device that simultaneously and independently false-twists two yarns by setting the helical direction of the order of the disks in contact with the yarn and the rotating direction of the disks in the same direction.