JPH07243136A - False twister and false twisting method - Google Patents

Abstract

PURPOSE:To provide a false twister capable of uniting false-twisting units into one, increasing the speed thereby, making it possible to miniaturize the production apparatus, improving the production efficacy and stably false twisting filaments in relation to a false twister for applying a false twist to filaments. CONSTITUTION:This false twister equipped with a rotational guide between a pack l for extruding high-temperature filaments and a winding bobbin 8 and applying a false twist thereto is composed of a bellow-shaped false twisting nozzle 4 having widened outer peripheries at both the ends, a pair of radial magnetic bearings 5 attached to the outer periphery of this false twisting nozzle 4, a motor 6 arranged in a space between the radial magnetic bearings 5 and 5 and an axial magnetic bearing 7 attached on the outside of the radial magnetic bearings 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a false twisting device for falsely twisting a filament, and false twists the filament by using mechanical frictional force.

[0002]

2. Description of the Related Art As a false twisting device for false twisting a high temperature filament extruded from a spinning nozzle mounted in a pack, the filament is introduced into a curved yarn guide tube provided in a rotating portion supported by a ball bearing driven by a motor. , There is one in which a curved guide tube is biased from the axis with respect to the drawing direction of the yarn guide hole and a false twist is applied to the filament by rotating the rotating part (for example, Japanese Patent Laid-Open No. 3-124874).
Issue).

[0003]

However, in such a conventional technique, a rotating portion is provided for each filament for false twisting, and each of them is rotated by a small drive motor. The number of filaments required to make one motor and its associated equipment are required, and the area occupied by the production equipment cannot be reduced and it is not easy to increase production efficiency. On the other hand, in order to increase the production amount per unit time, that is, the productivity, it is sufficient to increase the rotation speed of the motor, but if a high-speed motor is used for each of the many false twisting devices, there is a drawback that the cost is significantly increased. . Further, when the rotating portion is supported by grease such as a ball bearing or oil lubrication, oil droplets of lubricating oil are scattered and oil adheres to the filament. Although it is possible to use a hydrostatic bearing in order to rotate the rotating portion at a high speed, it is conceivable that the filament fluctuates due to the air blow and the false twist state is not stable. Therefore,
INDUSTRIAL APPLICABILITY The present invention consolidates a false twisting device for false twisting a filament into one to increase the speed, to improve the production efficiency from the viewpoint of both downsizing of the production equipment for false twisting and improvement of the processing speed, and to provide stable false twisting. It is an object of the present invention to provide a false twisting device for applying a twist.

[0004]

In order to solve the above problems, the present invention provides a rotating guide between a pack 1 for extruding filaments having a high temperature and a winding bobbin 8,
In a false twisting device for false twisting, a bellows-shaped false twisting nozzle 4 having an outer circumference extending at both ends, a pair of radial magnetic bearings 5 provided on the outer circumference of the false twisting nozzle 4, and the radial magnetic bearings 5 and 5 are provided. The motor 6 provided between them and the axial magnetic bearing 7 provided outside the radial magnetic bearings 5, 5 constitute a false twisting device.

[0005]

By the above means, a large number of filaments are simultaneously false-twisted by friction between the false-twisting nozzle rotating at a high speed and the filaments.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a false twisting machine of the present invention. In the figure, 1 is a pack, 2 is a spinneret, 3 is a filament, 4
Is a false twist nozzle, 5 is a radial magnetic bearing, 6 is a motor, 7
An axial magnetic bearing, 8 is a winding bobbin, 9 is a filament guide, 10 is a rotor hub, and 11 is a stator hub. Spinning nozzle 2 of spinneret 2 mounted on pack 1
The filaments 3 of 21 spinning nozzles extruded from No. 1 are cooled and reach the inlet 43 of the false twist nozzle 4. The false twist nozzle 4 is provided concentrically with the spinning nozzle 21 of the spinneret 2.
The inner diameter is smaller than the pitch circle of the spinning nozzle 21. The false twist nozzle 4 has trumpet-shaped openings at both ends on the outer diameter side, and projections 41 having arcs in the axial direction at both ends on the inner diameter side.
It is a bellows-shaped cylinder made of ceramic, which is provided with a concave portion 42 having an arc in the axial direction in the central portion, wear-resistant steel, and metal on which a wear-resistant material such as silicon nitride or boron is implanted. In this example, the convex portions 41 are provided at both ends of the inlet and the outlet of the false twist nozzle 4 and the concave portion 42 is provided at the central portion, but one convex portion 41 may be provided at the central portion. On the outer circumference of the false twist nozzle 4, a rotor hub 1 made of a magnetic material and having a circular tubular shape is formed.
0 is closely fitted. Convex portion 41 on the outer periphery of the false twist nozzle 4
The space 45 formed between the portion corresponding to the concave portion 42 and the inner diameter of the rotor hub 10 is filled with a resin having good heat conductivity such as iron cement. The false twist nozzle 4 and the rotor hub 10
In order to be integrated, it may be cut out from the block. Also, the outer peripheral surface of the false twist nozzle 4 is made cylindrical and the rotor hub 1
0 may be closely fitted. On the outer circumference of the rotor hub 10,
A pair of radial magnetic bearing rotors 51 in which magnetic steel plates are stacked is fixed in the axial direction with a motor rotor 61 in which magnetic steel plates are stacked. An axial magnetic bearing disk 72 made of a magnetic material is fixed to the outer peripheral end of the rotor hub 10. The pair of radial magnetic bearing rotors 51 are opposed to a radial magnetic bearing stator 52 in which an excitation winding is wound around a magnetic core through a gap. The motor rotor 61 is
A motor stator 62, in which an armature winding is wound around a magnetic core, is opposed to the magnetic core via a gap. On the outer diameter side of the radial magnetic bearing rotor 51, there is provided a displacement detector 53 for detecting the displacement in the radial direction through a gap, and the magnetic bearing control device receiving the signal so that the gap value maintains a constant value. (Not shown) controls the exciting current of the exciting winding. On one side or both sides of the axial magnetic bearing disk 72, an axial magnetic bearing stator 71 in which an excitation winding is wound around a magnetic core is opposed to each other through a gap. Radial magnetic bearing stator 52 and motor stator 6
The outer circumference of 2 and the outer circumference of the axial magnetic bearing stator 71 are closely fitted to the stator hub 11. A displacement detector 53 for detecting displacement in the axial direction is provided on one surface of the axial magnetic bearing disk 72 through a gap,
The exciting current of the exciting winding is controlled by an axial magnetic bearing control device (not shown) which receives the signal so that the air gap value maintains a constant value. The false twist nozzle 4 can be rotated at a high speed by operating the motor 6 at a high frequency with an inverter or the like and controlling the levitation by the active radial and axial magnetic bearings 5 and 7. The false twisting nozzle 4, the radial magnetic bearing 5, the motor 6 and the axial magnetic bearing 7 constitute a false twisting device that rotates at a high speed. The filament 3 exiting the outlet 44 of the false twisting nozzle 4 is moved up and down at a constant speed / constant stroke so as to guide the filament 3 to the winding position of the winding bobbin 8, and the tip of the elastic finger 91 is moved. A plurality of filament guides 9 of the ring-shaped filament 3 provided in the above are wound on the winding bobbin 8 for the number of filaments 3. The pitch circle of the filament guide 9 is made larger than the inner diameter of the outlet 44 of the false twist nozzle 4 so that tension is applied to the filament 3 and, at the same time, the elasticity of the finger 91 suppresses the tension fluctuation. Each of the winding bobbins 8 is arranged concentrically with the false twisting nozzle 4 on a pitch circle larger than the inner diameter of the outlet 44 of the false twisting nozzle 4 at the same pitch angle as the spinning nozzle 21. The speed is controlled so that the tension applied to the filament 3 becomes constant, and the filament 3 is rotated in the same direction as the false twisting nozzle 4 to wind the filament 3 evenly. In the embodiment, the axial magnetic bearing stator 71 is provided on both the upper side and the lower side of the axial magnetic bearing disk 72 so as to increase the weight of the false twist nozzle 4, but the axial magnetic bearing stator 71 is provided with the axial magnetic bearing disk 72. It may be provided on one side above or below. The operation will be described below. The filaments 3 extruded from the spinning nozzle 21 at a high temperature pass through the inner diameter of the false twist nozzle 4 and are wound on the winding bobbin 8 while controlling the tension. At this time, the plurality of filaments 3 are brought into contact with and guided by the arcuate convex portion 41 of the inlet 43 of the false twist nozzle 4 which is rotating at high speed, and are cooled. At this time, the filament 3 is false twisted by friction with the convex portion 41. Next, the filament 3 passes over the arcuate concave portion 42 without contacting the false twisting nozzle 4, is contacted and guided by the arcuate convex portion 41 of the outlet 44, and is cooled while false twisting. Further, the filament 3 is wound around the winding bobbin 8 while suppressing tension fluctuations by the filament guide 9 which moves up and down at a constant speed and a constant stroke.

FIG. 2 is a sectional view of the second embodiment of the present invention. In this embodiment, the displacement detector 53 for detecting the displacement in the radial direction and the control device of the embodiment are omitted, and the radial magnetic bearing rotor 51 of the embodiment is replaced by the permanent magnet rotor 54.
The radial magnetic bearing stator 52 is replaced by a permanent magnet stator 55.
In addition, the axial magnetic bearing stator 71 is replaced with a permanent magnet stator 74, the axial magnetic bearing disk 72 is replaced with a permanent magnet disk 73, and the polarities of the facing magnetic poles of the respective permanent magnets are made the same, and the passive type radial magnetism is generated by magnetic repulsion. The magnetic bearing 5 is configured. In this embodiment, the device can be simplified.

[0008]

As described above, according to the present invention, a large number of filaments are simultaneously false-twisted and wound up through one high-speed rotating annular false-twisting nozzle. In addition to downsizing, the processing speed can be increased, which has the effect of increasing production efficiency. Since the false twist nozzle is supported by the magnetic bearing, there are no oil droplets or fumes that adversely affect the filament, so stable false twist can be performed.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of essential parts showing a second embodiment of the present invention.

[Explanation of symbols]

 1 Pack 2 Spinneret 21 Spinning Nozzle 3 Filament 4 False Twisting Nozzle 41 Convex 42 Concave 43 Inlet 44 Outlet 5 Radial Magnetic Bearing 51 Radial Magnetic Bearing Rotor 52 Radial Magnetic Bearing Stator 53 Displacement Detector 54 Permanent Magnet Rotor 55 Permanent Magnet Stator 6 Motor 61 Motor rotor 62 Motor stator 7 Axial magnetic bearing 71 Axial magnetic bearing Stator 72 Axial magnetic bearing disk 73 Permanent magnet disk 74 Permanent magnet stator 8 Winding bobbin 81 Spindle motor 9 Filament guide 91 Finger 92 Actuator 10 Rotor hub 11 Stator hub

Claims (7)

[Claims] 1. A false twisting device for providing false twist by providing a rotating guide between a pack for extruding filaments having a high temperature and a winding bobbin, and having a trumpet-like spread on both outer circumferences and a shaft on the inner diameter side. Direction false-twisting nozzle having arcuate convex portions, a pair of radial magnetic bearings provided on the outer periphery of the false-twisting nozzle, a motor provided between rotors of the radial magnetic bearing, and the radial magnetic bearing A false twisting device comprising an axial magnetic bearing provided on the outer side of the false twisting device. 2. The radial magnetic bearing is fixed to an external fixed object, which is opposed to the rotor hub fitted to the outer circumference of the false twist nozzle and the rotor of the radial magnetic bearing fixed to the outer circumference of the rotor hub via a gap. A stator hub and a stator of a radial magnetic bearing fixed to the inner circumference of the stator hub, wherein the axial magnetic bearing includes a rotor of the axial magnetic bearing fixed to one end of the rotor hub and an axial magnetic bearing fixed to the inner circumference of the stator hub. The false twisting device according to claim 1, comprising a stator. 3. The false twisting device according to claim 1, wherein the stators of the radial magnetic bearing and the axial magnetic bearing are electromagnets and are actively controlled. 4. The false twisting device according to claim 1, wherein the rotor and the stator of the radial magnetic bearing and the axial magnetic bearing are permanent magnets and are passively supported. 5. The false twisting device according to claim 1, further comprising a tension changing mechanism provided between the exit of the false twisting nozzle and the winding bobbin. 6. The false twisting device according to claim 1, wherein the false twisting nozzle is rotated at a high speed, and the filament under tension is projected in an arcuate shape on the inner diameter side and the axial direction of the false twisting nozzle. A false twisting method, wherein the filament is false twisted by a frictional force generated between the filament and the convex portion of the false twisting nozzle. 7. A filament guide elastically supported in order to absorb a variation in tension of the filament in order to make a frictional force between the filament and the false twist nozzle constant.
The false twist method described.