JP2002173838A - Spindle device in covering machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spindle device in a covering machine, capable of improving the productivity of a covered yarn by the high-speed rotation of the spindle without causing problems such as seizing of a bearing part. SOLUTION: A hollow spindle 102 capable of allowing a yarn-feeding bobbin 13 to be set on one end side, and having a yarn-introducing hole 11 penetrating the center part and for allowing a core yarn to pass is freely rotatably supported by magnetic bearings 104, 105 and 106 on a fixing part 103 in a noncontact state. The magnetic bearings are constituted of active or passive radial magnetic bearings 104 and 105 freely rotatably supporting the hollow spindle 102 in the noncontact state at upper and lower both sides sandwiching a driving part 15, and an active axial magnetic bearing 106 for regulating the position in the axis direction, and the hollow spindle 102 is belt-driven at the driving part 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a spindle device for a covering machine.

[0002]

2. Description of the Related Art A covering machine used for manufacturing a covered yarn winds a cover yarn unwound from a spinning bobbin supported on a hollow spindle around a core yarn running through a hollow spindle rotating at a high speed. is there.

Conventionally, this hollow spindle has a ball bearing 3 mounted on a bracket 2 fixed to a machine base as shown in FIG.
, And a plurality of hollow spindles 1 are driven and rotated at the same time by contacting a driving belt 4 with the peripheral surface of the hollow spindle 1, but run linearly. Since the cover yarn b is spirally wound around the core yarn a, the supply amount of the cover yarn b is inevitably increased as compared with the core yarn a, and in order to produce a covered yarn c with good covering properties, Since it is necessary to increase the number of turns of the cover yarn b, the spindle 1 is rotated at a high speed so as to be incomparable with the yarn feeding speed of the core yarn a.

[0004] For this reason, if the operating speed of the covering machine is to be increased, the rotational speed of the hollow spindle 1 is immediately increased even though the yarn supplying and winding section of the core yarn a has a sufficient reserve of speed. , The number of rotations reaches the allowable rotation speed, causing problems such as image sticking, which is an obstacle to improving the productivity.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described problems of the conventional covering machine, and it is an object of the present invention to improve the productivity of a covered yan by rotating a spindle at a high speed without causing a problem such as seizure of a bearing portion. The purpose of the present invention is to provide a possible spindle device of a covering machine.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a yarn introduction bobbin in which a yarn supplying bobbin for a covering yarn can be inserted at one end and a core yarn passes through the center. Is rotatably supported by a magnetic bearing in a non-contact state with respect to the fixed portion. The magnetic bearing includes an active or passive radial magnetic bearing that supports a hollow spindle rotatably in a radial direction in a non-contact state on both upper and lower sides of a driving unit, and an active axial that regulates an axial position. The hollow spindle is constituted by a magnetic bearing, and the hollow spindle is brought into contact with the drive belt in the drive section to be driven by the belt. Instead of driving the hollow spindle by a belt, the hollow spindle may be driven by a motor composed of a rotor integrated with the hollow spindle and a stator arranged around the rotor in a non-contact manner. In addition, a hollow spindle penetrating the yarn introduction hole at the center is rotatably supported in a contact state by a rolling bearing, and the hollow spindle is brought into contact with a drive belt in a driving section so that the hollow spindle is driven. It is also possible to provide a magnetic biasing means for generating a magnetic attraction force or a magnetic repulsion force in a non-contact state in a direction opposite to a direction in which the contact pressure of the drive belt is applied to the spindle. Further, the magnetic bearing includes a permanent magnet fixed to the hollow spindle and a second type superconductor arranged in a non-contact manner around the permanent magnet, and rotatably supports the hollow spindle in a non-contact state. A superconducting magnetic bearing can also be used.

[0007]

FIG. 1 shows a spindle device 101 according to a first embodiment of the present invention. In the figure, a spindle device 101 includes a hollow spindle 102,
Bracket 103 (fixed part), radial magnetic bearing 10
4,105, axial magnetic bearing 106, auxiliary bearing 10
7, 108 mainly.

The hollow spindle 102 penetrates the yarn introduction hole 11 at the center, and has a disc-shaped rotor 12 fixed to a stepped portion near the lower end. Further, the upper end portion of the taper shape is a support portion 14 for supporting the yarn supplying bobbin 13 for the cover yarn. Further, a central portion where the drive belt 16 contacts is a drive unit 15.

The bracket 103 includes an upper bracket 31 and a lower bracket 32 located on both upper and lower sides of the driving section 15 and the driving belt 16 and a connecting section 33 for connecting them. The rear side (the right side in FIG. 1) is cut out in a substantially half, so that the drive belt 16 can travel while contacting the hollow spindle 102. The upper bracket 31 forms a housing for the upper radial magnetic bearing 104 and the auxiliary bearing 107, and the lower bracket 32 forms a housing for the lower radial magnetic bearing 105, the axial magnetic bearing 106 and the auxiliary bearing 108.

The radial magnetic bearings 104 and 105 are active type magnetic bearings. The rotors 41 and 51 on the hollow spindle 102 side and the stator 4 on the bracket 103 side, respectively.
2, 52. The stators 42, 52
A coil is wound around a plurality of cores projecting at equal positions on the inner peripheral side of the upper bracket 31 and the lower bracket 32,
When the plurality of coils are energized, the rotor 41,
The respective cores are arranged such that suction forces are generated in two axial directions perpendicular to each other in the radial direction with respect to 51.

On the other hand, a radial displacement sensor (not shown) for detecting the radial position of the hollow spindle 102 is provided on the upper bracket 31 and the lower bracket 32, and the coils of the stators 42 and 52 are detected based on the detection signals. The output of the hollow spindle 102 is controlled by controlling the displacement in the two axial directions and the inclination around those axes.
Is rotatably supported in a non-contact state in the radial direction.
The rotors 41 and 51 have a laminated structure in which thin electromagnetic steel sheets are laminated to reduce eddy current loss.

The axial magnetic bearing 106 has stators 61 and 62 disposed above and below the disk-shaped rotor 12, and the stators 61 and 62 are arranged in the axial direction (upward in the figure) with respect to the rotor 12, respectively. And downward (in the downward direction).
The output of the upper and lower stators 61 and 62 is controlled based on the detection signal of an axial displacement sensor (not shown) for detecting the displacement of the hollow spindle 102 in the axial direction. In a non-contact state. The upper and lower stators 6
One of the stators 1 and 62 may have a fixed output, or may be replaced with a permanent magnet, and only the output of the other stator may be controlled.

The spindle device 1 constructed as described above
Reference numeral 01 denotes a hollow spindle 102 by five-axis control in which one axial axis is controlled by an axial magnetic bearing 106 in addition to four axial controls by a radial magnetic bearing 104 and 105 in the radial direction.
Are rotatably supported in a non-contact state, so that the rotational resistance is extremely small, and the hollow spindle 102 can rotate at high speed.

Each of the magnetic bearings 104, 105, 1
In place of using a normal conducting coil for the coils of the stators 42, 52, 61, and 62, a superconducting coil is used and the magnetic bearings 104, 105, and 106 are made of superconducting magnetic bearings, so that the contact pressure of the drive belt 16 is increased. , A sufficiently large inertial rigidity can be obtained.

The auxiliary bearings 107 and 108 are rolling bearings (ball bearings) which rotatably support the hollow spindle 102 when the support force of the magnetic bearings 104, 105 and 106 is lost due to a power failure or when the operation is stopped. ), The support 7 supported by the upper bracket 31 and the lower bracket 32 via elastic members 71 and 81 such as rubber.
2, 82 and are disposed close to the periphery of the hollow spindle 102 with a smaller gap than the gap between the hollow spindle 102 and the radial magnetic bearings 104, 105. Note that the auxiliary bearings 107 and 108 can also receive an axial load.
Rotor 12 and stator 6 of axial magnetic bearing 106
The hollow spindle 102 has a smaller gap than the gap between
Are arranged in close proximity to each other.

There are various embodiments of the present invention other than those described above, depending on the type and drive form of the magnetic bearing. Each embodiment will be described below with reference to the drawings. Note that members common to the first embodiment are denoted by common reference numerals, and description thereof will be omitted.

FIG. 2 shows a spindle device 201 according to a second embodiment of the present invention.
Is a motor 1 integrated with the hollow spindle 202 as a drive source.
7, the other radial magnetic bearings 204,
205, an axial shaft bearing 206 and an auxiliary bearing 207,
The configuration of 208 is the same as that of the first embodiment.

The motor 17 comprises a rotor 21 fixed to a hollow spindle 202 and a stator 22 fixed inside a bracket 203. The motor 17 has no brushes or rings, such as a PM motor, a DC brushless motor, and an induction motor.
A motor in which the first side and the bracket 203 side do not contact each other is preferable. In the case of such a motor drive, a motor 17 is provided for each spindle. However, since the radial and axial magnetic bearings 104, 105, and 106 have low rotational resistance, each motor 17 itself has a relatively small output. good.

FIG. 3 shows a spindle device 301 according to a third embodiment of the present invention.
Is a form in which the radial magnetic bearings 304 and 305 are passive magnetic bearings, and includes an axial magnetic bearing 306, auxiliary bearings 307 and 308, and a driving unit 15 driven by a belt.
Is similar to that of the first embodiment.

Passive radial magnetic bearings 304, 305
Is a rotor 3 made of a permanent magnet on a hollow spindle 302.
The stators 342 and 352, which are also made of permanent magnets, are fixed to the brackets 303 and 41, 351 and the rotors 341 and 351 and the stators 342 and 3 respectively.
In the permanent magnet 52, the N poles and the S poles face each other to generate a magnetic repulsive force.
The S poles are alternately arranged, and those that are magnetized so that their polarity and magnetic force are uniform in the circumferential direction are used.

The axial magnetic bearing 306 keeps the axial position constant so that the repulsive force between the rotors 341 and 351 and the stators 342 and 352 of the radial magnetic bearings 304 and 305 is stabilized. Is rotatably supported in a non-contact state. still,
Instead of a permanent magnet, a normal conducting magnet having a constant output can be used, or a superconducting magnet can be used in a permanent magnet mode.

FIG. 4 shows a spindle device 401 according to a fourth embodiment of the present invention.
Uses the motor 17 integrated with the hollow spindle 402 as the drive source as in the second embodiment, and uses the passive radial magnetic bearings 404 and 405 and the axial magnetic bearing 4
06, the configurations of the auxiliary bearings 407 and 408 are the same as in the third embodiment.

The spindle device 1 of each embodiment described above.
01 to 401 are all hollow spindles 102 to 40
2 is supported in a non-contact state, but as described below, there is an embodiment in which a hollow spindle is used in combination with a rolling bearing that supports the hollow spindle in a contact state.

FIG. 5 shows a fifth embodiment of the present invention based on the embodiment.
1 shows an apparatus 501 on a spindle according to an embodiment.
In the figure, a spindle device 501 includes a hollow spindle 502 in an upper bracket 31 and a lower bracket 32, as in a conventional spindle device.
7,508 (ball bearing) so as to be rotatable, and magnetic biasing means 504,505 are also provided.

The magnetic biasing means 504 and 505 are basically the same as the active radial magnetic bearings described in the first and second embodiments.
41, 551 and stators 542, 552 (electromagnets) fixed to the upper bracket 31 and lower bracket 32 sides
A magnetic attraction force is generated for the rotors 541 and 551 by energizing coils (not shown) of the stators 542 and 552. Instead of the radial displacement sensor, a radial load sensor is used. (Not shown). The radial load sensor is, for example, a rolling bearing 5.
07,508 and the supports 72,82.

The radial load, mainly the drive belt 1
6. In accordance with the unbalance load caused by the contact pressure of No. 6, control is performed to generate a magnetic attraction force that cancels the unbalance load.
The above-mentioned unbalanced load is compensated, and the rolling bearings 507, 5
08 to reduce the load, to cope with high-speed rotation, and to prolong the service life.

FIG. 6 shows a spindle device 601 according to a sixth embodiment of the present invention.
The magnetic brackets 604 and 607 fix the rotors 641 and 651 made of permanent magnets to the hollow spindle 602 while the upper bracket 31 and the lower bracket 3
2 on the opposite side (left side in the figure) of the drive belt 16 on the inner peripheral surface,
Permanent magnets 642 and 652 are provided so as to generate magnetic repulsion with the rotors 641 and 651, and non-magnetic materials 643 and 653 are disposed on the other portions of the inner peripheral surface to provide magnetic repulsion on the same side. To prevent repulsion from occurring, drive belt 1
6 to compensate or reduce the unbalanced load on the rolling bearings 607 and 608.

The permanent magnets 642, 652 and the non-magnetic material 6
43, 653 and the permanent magnet 6
The magnetic poles are arranged so as to generate magnetic attraction between the rotors 42 and 652 and the rotors 641 and 651 (or the permanent magnets 642 and 652 are simply magnetic materials), and the rolling bearings 607 and 608 are generated by the magnetic attraction. May be compensated or reduced.

The magnetic repulsive force of the magnetic urging means 604 and 605 and the axial component of the attraction force can be received by the rolling bearings 607 and 608. The respective axial components are offset so that they are opposite to each other in the vertical direction, and the rolling bearings 607, 60
Advantageously, no axial load occurs on 8.

FIG. 7 shows a spindle device 701 according to a seventh embodiment of the present invention. In the figure, a spindle device 701 is configured such that a hollow spindle 702 is rotatably supported in a non-contact state by superconducting magnetic bearings 704 and 705, and a driving source is a hollow spindle like the second and fourth embodiments. The same applies to the configuration of the auxiliary bearings 707 and 708 using the motor 17 integrated with the motor 702.

The superconducting magnetic bearings 704, 705 have ring-shaped permanent magnets 741, 741, 751, 751 fixed to the upper and lower surfaces of rotors 743, 753 fixed to the upper and lower sides of the motor 17 of the hollow spindle 702, respectively. On the other hand, the permanent magnets 741 and 7
The second-type superconductors (high-temperature superconductors) 742, 742, 752, and 752 are fixed so as to face 41, 751, and 751, respectively. And the second type superconductors 742, 742,
Coolant flow paths 744 and 754 are provided around 752 and 752.
(Cooling means) for flowing a coolant such as liquid nitrogen supplied from a refrigerator (not shown).
2,742,752,752 can be cooled below the critical temperature at which the phase transition to the superconducting state occurs. The permanent magnet 74
1, 741, 751, and 751 are arranged or magnetized so that the polarity and the magnetic flux distribution are uniform in the circumferential direction.

Second type superconductors 742, 742, 752
752 has a relatively high critical temperature, such as an yttrium-based high-temperature superconductor, and has normal conductive particles uniformly mixed therein, so that when placed in a predetermined magnetic field in a superconductive state, the normal conductive Has a so-called pinning effect in which the magnetic flux that has entered the portion of
44,754 coolant is circulated and the second type superconductor 74
When the 2,742,752,752 is cooled below the critical temperature, the magnetic flux penetration of the permanent magnets 741,741,751,751 fixed to the rotors 743,753 of the hollow spindle 702 is restrained, and the hollow spindle 702 is in a non-contact state. Support with. Spindle device 701 thus configured
Has the advantage that the position control of the hollow spindle 702 is not required, the support rigidity is large, and the stability is excellent.

[0033]

As described above, the spindle device of the covering machine according to the present invention has a hollow spindle through which a yarn supplying bobbin for covering yarn can be inserted at one end and a yarn introduction hole through which a core yarn passes at the center. Is rotatably supported in a non-contact state by a magnetic bearing with respect to the fixed portion, so that the rotational resistance of the bearing portion is extremely small, the high-speed rotation of the hollow spindle is possible, and the life of the bearing portion is extended, It is possible to improve the productivity of covered yarn and the service life of machinery and equipment.

Further, a hollow spindle penetrating the yarn introducing hole at the center is rotatably supported in a contact state by a rolling bearing, and the hollow spindle is brought into contact with a drive belt at a drive section to be driven by the belt. Since magnetic biasing means for generating a magnetic attraction force or a magnetic repulsion force in a non-contact state in a direction opposite to a direction in which the contact pressure of the drive belt is applied to the hollow spindle is provided, the bearing has a relatively simple configuration. The load on the bearing can be reduced, and the bearing can cope with high-speed rotation and extend the life.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a spindle device according to a first embodiment of the present invention.

FIG. 2 is a side sectional view showing a spindle device according to a second embodiment of the present invention.

FIG. 3 is a side sectional view showing a spindle device according to a third embodiment of the present invention.

FIG. 4 is a side sectional view showing a spindle device according to a fourth embodiment of the present invention.

FIG. 5 is a side sectional view showing a spindle device according to a fifth embodiment of the present invention.

FIG. 6 is a side sectional view showing a spindle device according to a sixth embodiment of the present invention.

FIG. 7 is a side sectional view showing a spindle device according to a seventh embodiment of the present invention.

FIG. 8 is a side sectional view schematically showing a covering machine.

[Explanation of symbols]

101, 201, 301, 401, 501, 601, 7
01 Spindle device 102, 202, 302, 402, 502, 602, 7
02 Hollow spindle 103, 203, 303, 403, 503, 603, 7
03 Bracket (fixed part) 104, 105, 204, 205, 304, 305, 4
04,405 Radial magnetic bearings 106,206,306,406 Axial magnetic bearings 107,108,207,208,307,308,4
07, 408, 707, 708 Auxiliary bearings 504, 505, 604, 605 Magnetic biasing means 507, 508, 607, 608 Rolling bearings 704, 705 Superconducting magnetic bearings 11 Yarn holes 13 Yarn supply bobbin 15 Drive unit 16 Drive belt 17 motor

Claims (5)

[Claims] 1. A hollow spindle through which a yarn supplying bobbin for covering yarn can be inserted at one end and a yarn introduction hole through which a core yarn passes at a center portion is not in contact with a fixed portion by a magnetic bearing. A spindle device for a governing machine, which is rotatably supported in a state. 2. An active or passive radial magnetic bearing for supporting a hollow spindle rotatably in a radial direction in a non-contact manner on both upper and lower sides of a drive unit with a hollow spindle interposed therebetween, and restricting a position in an axial direction. The hollow spindle is in contact with a drive belt in a drive section and is driven by the belt.
A spindle device of the covering machine described. 3. The motor according to claim 2, wherein the hollow spindle is driven by a motor composed of a rotor integrated with the hollow spindle and a stator arranged in a non-contact manner around the rotor instead of the belt driving. A spindle device of the covering machine described. 4. A hollow spindle penetrating a yarn guide hole at the center is rotatably supported in a contact state by a rolling bearing, and the hollow spindle contacts a driving belt at a driving portion to be driven by the belt. A magnetic biasing means for generating a magnetic attraction force or a magnetic repulsion force in a non-contact state in a direction opposite to a direction in which a contact pressure of a drive belt is applied to the hollow spindle, apparatus. 5. A magnetic bearing, comprising: a permanent magnet fixed to a hollow spindle; and a second type superconductor arranged in a non-contact manner around the permanent magnet, so that the hollow spindle is rotatable in a non-contact state. 2. A supporting superconducting magnetic bearing.
A spindle device of the covering machine as described.