ITRM930153A1 - SPINNING DEVICE. - Google Patents

Description

"SPINNING DEVICE"

SUMMARY

An air spinning device equipped with a spindle drive of simple construction adapted to drive a spindle for rotation at a single speed. of high rotation. The air spinning device comprises a nozzle block provided with nozzle holes through which compressed air is expelled to produce a swirling air stream which acts on a bundle of fibers delivered by a unit. a hollow spindle supported on a pneumatic bearing having a cylindrical bushing, and a guide member held in place with its tip directed toward the inlet of the spindle.

DESCRIPTION of the industrial invention entitled: "SPINNING DEVICE?

DESCRIPTION

BACKGROUND OF THE INVENTION

Field of the invention

The present invention relates to a spinning device for twisting a bundle of fibers formed of short non-twisted fibers delivered by a unit? by applying a swirling current of air.

Statement of the related technique

The Applicant of the present application has previously proposed an air spinning device for producing a twisted yarn in the utility model. Japanese exhibited No. HEI 4-56771.

This previously proposed air spinning device comprises a hollow spindle and a guide member disposed with its tip directed towards the end. input of the hollow spindle, and twists a bundle of fibers delivered by a unit? ironing by means of a jet of air swirling towards the extremity? of entry of the spindle. In practical application, this air spinning device is driven directly with the belt of a belt-type spindle drive, with the three rollers of the roller-type spindle drive arranged around the spindle so as to supporting the spindle or by the high frequency induction motor of a motor-type spindle drive device having a hollow rotor incorporating the spindle.

The belt-type spindle drive device does not? able to operate the spindle at a speed? of rotation greater than about 30,000 revolutions per minute. Although the roller type spindle driving device is capable of driving the spindle with one rotation at a speed? of relatively high rotation, the roller-type spindle drive requires a drive motor and the drive motor needs to be cooled as it drives the spindle at a speed. of high rotation. Therefore, the roller type spindle drive device? costly. The motor-type spindle actuation device, similarly to the roller-type spindle actuation device, requires a motor and therefore the same can be used. say of the motor-type spindle driving device.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a spinning device equipped with a spindle drive device of simple construction capable of driving a spindle at a speed. of high rotation.

To achieve the object, the present device provides a spinning device comprising a nozzle block provided with nozzle holes for applying a swirling stream of air to a bundle of fibers delivered from a unit. of drafting, a hollow spindle equipped with a pneumatic device for activating rotation, and a guide member arranged with its tip directed towards the inlet of the hollow spindle.

A bundle of fibers delivered by the unit? drawing is made to enter the spinning device of the above structure by applying a stream of air expelled through the nozzle holes, and then the ends? of all fibers of the bundle of fibers moving along the guide member are pulled into the rotating spindle by the yarn forming part of the bundle of fibers. The extremities posterior of the fibers extend away from the extremity? entrance of the spindle and are separated from each other. The extremities separated rear fibers are exposed to a swirling stream of air expelled through the nozzle holes and helically wound around the yarn forming portion of the fiber bundle to form a yarn having true twists.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1? a longitudinal sectional view of a spinning device in a first embodiment according to the present invention;

figure 2? a longitudinal sectional view of a spinning device in a second embodiment according to the present invention;

figure 3? a longitudinal sectional view of a spinning device in a third embodiment according to the present invention;

figure 4? a sectional view of an air turbine employed in a spinning device according to the present invention;

figure 5? a schematic illustration showing an arrangement of a spinning device of the present invention;

figure 6? a diagram showing the relationship between the number of turns of a spindle and the resistance of the wire; And

figure 7? a diagram showing the relationship between the number of turns of a spindle and the degree of thinning of the yarn.

DETAILED DESCRIPTION OF FAVORITE REALIZATIONS

A spinning device in a preferred embodiment in accordance with the present invention will come. described with reference to Figures 1 to 3.

The spinning device comprises a nozzle block 2 provided with nozzle holes 3 and arranged in a casing 1 located behind a unit? of ironing, a guide support 4 located at the end? of the nozzle block, a guide member 5 held by the guide support 4, and a spindle 6 located with its inlet part inserted in the casing 1.

A pass of bundle of fibers 7? formed through the spindle 6 along the axis of the spindle 6. The outside diameter of the inlet 6a of the spindle 6? sufficiently small. The entry part 6b of the spindle 6? shaped according to a conical shape that widens downwards.

An annular space 8 of relatively small diameter? formed between the nozzle block 2 and the inlet 6a of the spindle 6 surrounded by the nozzle block 2. The diameter of the end? anterior of the annular space 8? slightly larger than the diameter of the spindle tip 6. The annular space 8? connected to an annular space 9 formed between a lower casing Ib and the spindle 6, and an air discharge hole 10 opens into the annular space 9.

An air chamber 11? formed between an upper casing 1b and the nozzle block 2. Four air jet nozzle holes 3 are formed in the nozzle block 2 so? that the air chamber 11 communicates with the annular space 8 by means of the air jet nozzle holes 3. The air jet nozzle holes 3 extend obliquely downwards so as to be tangent to the annular space 8 to blow currents of air in the direction of rotation of the spindle 6. A hose, not shown,? connected to an opening 12 which opens into the air chamber 11.

Compressed air fed through the hose into the air chamber 11 is expelled through the nozzle holes 3 in the annular chamber 8 to produce a swirling air stream around the inlet 6a of the spindle 6. The air stream produced in the annular space 8 it slowly swirls in the annular space 9 and flows outward through the exhaust hole 10. At the same time, the air stream causes a suction flow of air which flows from the intake point of the front rollers into the casing 1.

The guide support 4 having the shape of a cap? provided with a fiber bundle inlet 13 at a position displaced from its center, and fixedly holds a guide member 5 having the shape of a pin so as to extend along its axis and the tip of the guide member guide 5? located opposite the entrance 6a of the spindle 6.

The spindle driving device shown in Figure 1 has a bearing housing 14, a bearing 15 which supports the spindle 6 on the bearing housing 14, and an air turbine for driving the spindle 6. The spindle driving device shown in Figure 2 has a bearing housing 14, an air bearing which supports the spindle 6 on the bearing housing 14, and an air turbine for driving the spindle 6. The spindle driving device shown in Figure 3 has a bearing housing 14 and an air bearing which supports the spindle 6 on the bearing housing 14, and drives the spindle 6 for rotation by means of the swirling air stream of compressed air expelled through the nozzle holes 3.

An air turbine shown in Figure 4 is used both by the spindle driving device of Figure 1 and by the spindle driving device of Figure 2. As shown in Figure 4, a cylindrical bushing 16 provided with a compressed air supply hole 16a tangent to the inner surface of the bushing 16 and an air exhaust hole 16b tangent to the inner surface of the bushing 16? disposed in the bearing housing 14. A compressed air supply hole 14a and an air exhaust hole 14b are formed in the bearing housing 14 so as to be connected to the compressed air supply hole 16a and the air exhaust hole respectively. air 16b. Spindle 6? equipped with semicircular recesses 6c in its external surface in positions corresponding to the extremity? of the compressed air supply hole 16a to receive the compressed air expelled through the compressed air supply hole 16a.

When compressed air is supplied to the air turbine through a hose, not shown, connected to the compressed air supply port 14a, the compressed air is expelled through the compressed air supply port 16a against the spindle recesses 6c 6 so as to drive the spindle 6 for rotation, and then the compressed air is discharged through the air discharge holes 16b and 14b.

The spindle drive devices shown in FIGS. 2 and 3 employ air bearings of the same construction. Each air bearing comprises a cylindrical bushing 17 provided with an annular groove in its outer circumference, and with radial air jet holes 17b. When the bushing 17 is placed in the bearing housing 14, an annular air chamber 17a is formed between the bearing housing 14 and the bushing 17. Compressed air supply holes 14c are formed through the bearing housing 14 so as to open in the annular bladder 17a. With 18? indicated an end cover fixed to the bearing housing 14.

When compressed air is fed through a hose, not shown, connected to the compressed air supply port 14c, the compressed air flows through the bladder 17a, the air blast holes 17b and the tiny spaces between the spindle 6 and the bushing 17 so as to support the spindle 6 floating in the bushing 17.

The spinning device shown in Figure 3 does not? equipped with any particular actuation device for operating the spindle 6. However, since? the time zone 6? supported in the air bearing and only a small resistance acts against the rotation of the spindle 6, the spindle 6 can? be driven by the compressed air expelled through the nozzle holes 3 for rotation at a speed? of very high rotation in the range of 60,000 to 80,000 revolutions per minute, provided? the components of the spinning device are formed with high dimensional accuracy.

When spinning a thread using the spinning device so? structured, a bundle of fibers formed by stretching a wick through the unit? is made to enter through the fiber bundle inlet hole 13 of the guide support 4 into the casing 1 by the action of the current of air expelled through the nozzle holes 3, the ends? of all the fibers forming the bundle of fibers which move along the guide member 5 are drawn into the spindle by the twisted part of the bundle of fibers. The extremities of the fibers extend away from the inlet 6a of the spindle 6 and are separated from each other. The extremities separate rear fibers are wound around the yarn forming part of the fiber bundle by the swirling stream of air expelled through the nozzle holes 3 to form a yarn having real twists. The guide member 5 prevents the propagation of the twists in the yarn-forming process and performs the function of the fibers of false central core. Thus, the spinning device of the present invention prevents the formation of a twistless core strand, which typically forms in conventional air spun, and the yarn produced using the spinning device of the present invention substantially consists of only wrapped fibers.

How ? evident from the above description, the spinning device of the present invention has the following advantages.

The spinning device? capable of spinning a yarn consisting primarily of wound fibers and in no way inferior in appearance and strength to yarns produced by ring spinning, the pneumatic spindle drive? able to operate the spindle for rotation at a speed? of high rotation that exceeds 100,000 revolutions per minute, and the spinning device stably produces a strong yarn without causing frequent yarn breaks. The spindle rotates silently without generating vibration noise. The fibers of the fiber bundle will not be twisted around the spindle in the event that the yarn breaks during the spinning operation. the torque of the spindle? very small . The air bearing only needs to support the weight of the spindle, has a simple structure,? cheap, can? be replaced with ease? with a new one and facilitates maintenance work.

As shown in Figure 5, the spinning device A of the present invention? arranged subsequently to a drafting part D located on the downstream side of a wick introduction guide 25 and comprising a pair of rear rollers 26, a pair of middle rollers 28 with ring belts 29 and a pair of front rollers 20. A line extending from right to left in the drawing? the path of travel of a bundle of fibers S or of a yarn Y, and the reference number 27 indicates a guide for adjusting the width of roving.

Figure 6? a diagram showing a relationship between the number of turns of a spindle and the resistance of the wire. In the belt driven spindle, the number of revolutions are in a range of 2 x

up to revolutions per minute. However, according to

the spindle that employs an air turbine of the present invention, can? be possible at most a number of turns of cos? that the resistance of the wire can? be increased and becomes equal to the thread resistance of a ring spinning machine thread.

Figure 7? a diagram showing a relationship between the number of turns of a spindle and the degree of thinning of the yarn. The degree of thinning of the thread? represented as the diameter of the wire. A unit? of the vertical axis of the diagram? a voltage (mV) that? was measured using a device for measuring the thickness of a wire. Does 355 mV correspond to about 0.2 mm? . As shown in the diagram, the diameter of a wire is reduced in the range of

up to revolutions per minute of a spindle and the

degree of thinning of a thread is improved. The wire used in the measurement of figures 6 and 7 was Ne40.

Claims (8)

CLAIMS 1. A spinning device comprising: a nozzle block provided with nozzle holes for applying a swirling stream of air to a bundle of fibers delivered from a unit. ironing; and a hollow spindle provided with a pneumatic rotational drive arrangement. 2. A spinning device according to claim 1, wherein said spinning device further includes a guide member disposed with its tip directed toward the end. entry of the hollow spindle. The spinning device of claim 1, wherein said pneumatic rotational drive arrangement comprises a bearing housing, a bearing which supports the hollow spindle on the bearing housing, and an air turbine for driving the hollow spindle. The spinning device of claim 1, wherein said pneumatic rotational drive arrangement comprises a bearing housing, an air bearing which supports the hollow spindle on the bearing housing, and an air turbine for driving the hollow spindle. 5. A spinning device according to claim 1, wherein said pneumatic rotating drive arrangement comprises a bearing housing and an air bearing which supports the hollow spindle on the bearing housing, and said hollow spindle is driven for rotation by the swirling current of compressed air expelled through the nozzle holes. 6. Spinning device according to any of claims 3 and 4, wherein said air turbine comprises a cylindrical bushing provided with a first compressed air supply hole tangent to the inner surface of the bushing and with a first air discharge hole tangent to the inner surface of the bushing is disposed in the bearing housing, and a second compressed air supply hole and a second air exhaust hole formed in the bearing housing so as to be connected to the first compressed air supply hole and the second respectively air exhaust hole, and the hollow spindle? equipped with recesses in its external surface in positions corresponding to the extremity? of the first compressed air supply hole to receive compressed air expelled through the first compressed air supply hole. 7. Spinning device according to any of claims 4 and 5, wherein said air bearing comprises a cylindrical bushing provided with an annular bladder formed between the bearing housing and the bushing, and radial air jet holes, and third holes compressed air feeds are formed through the bearing housing to flow into the annular bladder. 8. A method of making a yarn by spinning a hollow spindle at high speed? by means of an air turbine in the spinning device according to claim 1.