FIELD OF THE INVENTION:
The present invention relates to improvements in textile spindle assemblies and in particular to an apparatus of the type in which the individual spindles of the textile spinning and twisting machines are provided with built-in drive means.
BACKGROUND ART:
The spindle assembly in spinning and twisting machines comprises a top part and a bottom part. The top part comprises a spindle blade and a conical portion generally made of light weight material such as aluminium, the conical portion being rigidly fitted to the spindle blade. The bottom portion of the conical member is further fitted with a wharve member of cylindrical construction for radial engagement with a drive belt to incorporate rotary motion to the top part of the spindle.
Directly motor-driven spindle assembly for spinning machines, such as spinning frames and twisting frames are also known in the art. Such device comprises a spindle blade consisting of a lower spindle blade and an upper spindle blade fixed to the upper portion of the lower spindle blade. An electric motor is provided for driving the lower spindle blade and a bolster containing an insert bearing supporting the lower spindle blade is fixedly mounted on the spindle rail. An insert bearing is provided with a thrust bearing at its bottom to sustain the thrust of the spindle blade. The rotor of the electric motor is fixed coaxially to the lower spindle blade. The stator of the electric motor is disposed with a given gap between the rotor and the stator The rotor is provided with skew conductors as thrust generating means that generates a downward thrust according to the weight of a cop formed by winding the yarn on a bobbin put on the top part attached to the spindle blade. This spindle assembly is capable of rotating the spindle blade that carries the upper part of the spindle on which the conical tube is attached at rotating speed in the range of about 15,000 to 30,000 rpm .

It will be more advantageous if the textile spindle is capable of producing rotating speed of the spindle more than 30,000 rpm , preferably 30,000 to 40,000 rpm. This invention provides spindle assembly comprising means capable of producing propulsion to the upper part of the spindle through the combination of attractive and repulsive forces of the built-in magnet, constructed with magnetic levitation bearing to withstand the radial and axial loads of the upper rotating part of the spindle.
OBJECT OF THE INVENTION:
Accordingly, it is an t object of the present invention to provide an independently driven spindle assembly for spinning and twisting machines capable of stably rotating at higher rotating speeds.
It is an another object of the present invention is to provide a spindle assembly which consumes lesser power.
Another object of the present invention is to provide a spindle assembly capable of effectively suppressing the shock loads and vibrations generated in during working of the spindle.
Another object of the present invention is to provide a spindle assembly with reduced maintenance and increased life.
SUMMARY OF THE INVENTION:
Accordingly the invention provides a directly driven textile spindle assembly for use in ring spinning and twisting machines comprises a top part(TP) and a bottom part(BP), the said top part(TP) is rotatably supported in the said bottom part(BP) and means are provided for rotating the said top part(TP) by induced attractive and repulsive magnetic forces.

BRIEF DESCRIPTION OF THE DRAWING:
These and further objects, features and advantages of the present invention will become more readily apparent from the following detailed description thereof when taken in conjunction with the accompanying drawing;
Figure-1 illustrates the longitudinal sectional view of the present invention showing the spindle assembly provided with built-in drive means.
DETAILED DESCRIPTION OF THE DRAWING:
The invention will now be illustrated with reference to the accompanying drawing, which is provided for ready and better understanding. The drawing represents only a specific working embodiment of the assembly according to the invention although variants of the assembly may be made within the scope and ambit of the present invention.
The spindle assembly(l) used in ring spinning and twisting machines comprises a top part(TP) and a bottom part(BP). The top part(TP) comprises a spindle bearing shaft(2) and a conical part (la) preferably made of light weight material such as aluminium. The conical part(1a) is rigidly fitted to the upper portion of the spindle bearing shaft (2). The spindle bearing shaft(2) of the top part(TP) is rotatably supported in a housing (3) of the bottom part(BP). The bottom part(BP) comprises a propulsion magnetic coil(5) and a levitation magnetic coil(6) which are arranged at a pre determined distance apart in vertical axis in a tubular sub-housing(7) which is housed within the housing(3) and held by the upper cover(8) and lower cover(9) by suitable fixing means, for example by using fasteners(IO) and provided with necessary shielding. The material and hardness of the lower cover(9) are so chosen to have improved wear and impact resistance and also the inner bottom surface(9a) is provided with a layer of any known lubricant.

The bottom part(BP) also comprises two annular super conducting magnets namely top annular super conducting magnet(4a) and bottom annular super conducting magnet(4b) which are rigidly fitted to the bottom portion of the spindle bearing shaft(2). The super conducting magnet(4a) and bottom annular super conducting magnet(4b) are separated from each other to a pre determined distance in vertical axis by a partisan means(2a) of the spindle bearing shaft(2). The propulsion magnetic coil{5) is arranged in the housJng(3) coaxial to the top super conducting magnet(4a) at a pre determined radial distance and the levitation magnetic coil(6) is arranged in the housing(3) coaxial to the bottom super conducting magnet(4b) at a pre determined radial distance.
The polarities of the top annular super conducting magnet(4a) and bottom annular super conducting magnet(4b) are arranged alternatively as north pole and south pole so as to induce attractive and repulsive forces when ever the propulsion magnetic coil(5) and the levitation magnetic coil(6) are excited. In the vertical plane, the top annular super conducting magnet(4a) and bottom annular super conducting magnet(4b) are so positioned such that when the spindle is in an inoperative state, their bottom faces are at a pre determined lower levels with respect to the bottom faces of the propulsion magnetic coil(5) and the levitation magnetic coil(6) respectively. Propulsion magnetic coil(5) and the levitation magnetic coil(6) are provided with necessary terminals(11 and 12) respectively to connect to the control system for exciting. The control system comprises the means for evaluation of speed and or acceleration of the top part(TP) of the spindle assembly based on monitoring of electrical values of their power supply. The control system controls the rotational speed of the top part(TP) of the spindle assembly.
While the levitation magnetic coil(6) is activated, the magnetic forces lifts the top part(TP) due to the difference in the vertical positions of the bottom faces of the top annular super conducting magnet(4a) and bottom annular super conducting

magnet(4b). The repulsive magnetic force generated retain the bottom portion of the spindle bearing shaft(2) fitted with two annular super conducting magnets in such a manner that the spindle bearing shaft(2) carrying the conical part(1a) is always coaxial to the axis of the spindle assembly. The arrangement according to the invention disclosed enable the spindle bearing shaft(2) fitted with the conical part(1a) is mechanically separated from other bearing parts during working so as to have an air gap and a thick film of magnetic flux in between. This eliminates the continuous frictional contact between the rotating elements and also reduces the viscous friction on the entire bearing area. Air and magnetic flux is used as lubricant instead of lubricating oil as used in the known spindles.
When the propulsion magnetic coil(5) is excited, the induced repulsive and the attractive magnetic forces provide rotational motion to the top part(TP) of the spindle assembly comprising the spindle bearing shaft(2) and the conical part(la).
The levitation and propulsion activities are continuously performed to keep the system to run at the desired speed. By exciting the propulsion magnetic coil(5) to the pre determined value, the rotational speed of the top part(TP) of the spindle assembly comprising the spindle bearing shaft(2) and the conical part(1a) can be adopted according to the requirement. The combined action of the top annular super conducting magnet(4a) and bottom annular super conducting magnet(4b), propulsion magnetic coil(5) and levitation magnetic coil(6) thus rotates the top part(TP) of the spindle assembly at the required speed.

ADVANTAGES:
The present system is more advantageous due to the following reasons:
1. Since the drive means are built-in, there is a greater extent of reduction in power loss. The loss due to transmission of drive from motor to Individual spindles is avoided since the spindles are directly driven.
2. The friction between the rolling elements are eliminated since there are no roller or ball bearings used thereby minimising the heat generation and the power requirement of the system.
3. The friction due to oil lubrication is eliminated since air and magnetic flux are used as lubricants.
4. Lesser noise and vibration within the system since there are no rolling elements.
5. Reduced operating cost as no oil or consumable is required for lubrication and maintenance purposes.
6. More life of spindle.
The invention has been shown and described in a preferred form only and many variations may be made in the invention, which will still be comprised within its spirit. It is understood therefore, that the invention is not limited to the details cited above. The same can be replaced by its technical equivalence and yet the invention can be performed. The structure thus conceived is susceptible of numerous modifications and variations, all the details may furthermore be replaced with elements having technical equivalence. In practice the materials may be any according to the requirements, which will still be comprised within its true spirit.

WE CLAIM:
1. A directly driven textile spindle assembly for use in ring spinning and twisting machines comprises a top part (TP) and a bottom part (BP) , the said top part (TP) is rotatably supported in the said bottom part (BP) .wherein the means provided for rotating the said top part (TP) is by induced attractive and repulsive magnetic forces .
2. A directly driven textile spindle assembly as claimed in claim 1, wherein the said bottom part (BP) comprises a propulsion magnetic coil (5) and a levitation magnetic coil (6) arranged in a tubular sub-housing (7) at a pre determined distance apart in vertical axis and housed within a housing (3).
3. A directly driven textile spindle assembly as claimed in claim 2, wherein the said propulsion magnetic coil (5) and levitation magnetic coil (6) are further connected to a control means.
4. A directly driven textile spindle assembly as claimed in claim 1, wherein the said top part (TP) comprises spindle bearing shaft (2) and a conical part (la) is rigidly fitted to its upper portion.
5. A directly driven textile spindle assembly as claimed in claim2,3 & 4, wherein top annular super conducting magnet (4a) and bottom annular super conducting magnet (4b) rigidly fitted to the bottom portion of the said spindle bearing shaft (2) and coaxially arranged at a predetermined radial distance to the said propulsion magnetic coil (5) and levitation magnetic coil (6) respectively.
6. A directly driven textile spindle assembly as claimed in claim 5, wherein the said top annular super conducting magnet (4a) and bottom annular super

conducting magnet(4b) being separated from each other by partisan means(2a) of the said spindle bearing shaft(2).
7. A directly driven textile spindle assembly as claimed in claim 3 & 5, wherein
the propulsion magnetic coil(5) and levitation magnetic coil(6) are provided
with terminals(11,12) for exciting as well as to connect to the control system.
8. A directly driven textile spindle assembly as substantially herein described
and illustrated with reference to the accompanying figure.