FIELD OF THE INVENTION

The present invention relates to the waxing apparatus for textile spinning machines. Particularly, this invention relates to winding arrangement of textile machines like Airjet spinning, Rotor spinning, Cone/Cheese winding machines where the yarn is being applied with wax to reduce the coefficient of friction.

BACKGROUND OF THE INVENTION
In general, a wax layer is applied over the running yarn to reduce the coefficient of friction before the said yarn is wound on the package. In a wax or paraffin coating device, the yarn to be provided with a wax coating when it runs over a fixed waxing element which is rotatably mounted, whereby its rotational axis is perpendicular to the running direction of the yarn. The delivered yarn is guided over the front of the waxing element so that a thin layer of wax is applied to the yarn. For an even wax application, it is necessary that the waxing element remain always in the same position relative to the course of the yarn. In order to ensure this, the waxing element is mounted on its rotational axis so that it can be displaced in axial direction. A stop is provided in that case against which it is pressed in the direction of the yarn by means of a spring. The contact between the yarn and the waxing element is on the front of the latter. Due to the fact that it rotates slowly around an axis at a right angle to the direction of yarn movement, the front of the wax element is given a cambered surface. As can be seen in German Patent publication DE3422814 A1, the wax coating devices are also used in package forming madhines, directly in the area before the yarn draw-off. In airjet spinning machines for example, where a fiber sliver coming out of a sliver storage can is drafted and then twisted into a yarn by air vortex and spindle arrangement, the wax coating device is located between the air vortex in which the yarn is twisted, and the winding unit.
For even application of wax on the yarn, it is important that the surfaces of the wax element over which the yarn passes be always in the same position. Thereby the contact .conditions between the yarn and the waxing element remain constant so that the wax abrasion by the yarn is always constant and thereby the wax applied on the yarn also remains constant. The constant positioning of the wax element relative to the yarn is ensured through the fact that the wax body is pressed axially against a stop, i.e. by the contact surface with the yarn. For this purpose the wax coating device is provided with an elastic element which ensures that the waxing element is always pressed against its stop.
In the waxing device according to US Patent publication US5879455 A, rollers are used as path limitation means, which, rolling laterally on the end face of the waxing element, specify the respective working position of the waxing element. The rollers are mounted in this case, with their rotary pins are mounted wherein the holding sleeve supported eccentrically in a hole of a bearing housing; By adjusting the angular position of the holding sleeve in the hole of the bearing housing, the position of the path limitation rollers, and therefore the axial working position of the waxing element can be adjusted.
Furthermore, waxing devices are known from EP Patent publication EP0071582 A, wherein each case have a hook-like path limitation means adjustably mounted in an axial guide. The path limitation means of these waxing devices can bje fixed in various working positions and in a position in which the waxing element has no further contact with the thread.

The known waxing devices have the drawback that the wax body is relatively freely arranged in the installation position because of the complicated and unsecured construction and therefore tends to soiling owing to fibre fly. Moreover, the known waxing devices, in particular when the path limitation device is fixed in a working position in which the waxing element has no contact with the running thread, are also designed in a constructionally expensive manner.

Further known devices which includes variable path limiting means positioned to set according to the running thread requirement, wherein the wax holding sleeve is required to be completely swung out of the position while replacing the exhausted waxing element. Therefore the periodic operation (i.e., opening and closing) of wax holding sleeve will minimise the life of moving components as well as the magnet locker. Failure of magnetic lock or wear out of the hinge joint creates an improper wax holding and inadequate locking which in turn leads to poor waxing efficiency. If the operator fails to lock the wax holder properly, the said waxing element will drop out of the position and therefore it needs more operative attention.

OBJECTS OF THE INVENTION

It is an object of this invention to provide an adjustable waxing apparatus that is fixed in various working positions to offer an even and effective wax application on the yarn.

It is another object of this invention to provide an adjustable waxing apparatus that provides simple construction and offers an easy replacement of wax element.

Yet another object of the present invention is to provide an adjustable waxing apparatus that provides great stability to the wax holder to keep the wax element in a secured position.

SUMMARY OF THE INVENTION

According to an embodiment of the present invention, waxing apparatus for a textile machine comprises: a wax housing unit with wax element; at least a wax positioning element with a plurality of step like profiles to control the outward projection of wax element with respect to the running yarn; said steps having different'thickness to provide varying amount of wax element to the running yarn; characterized in that at least a face relief is provided in said wax positioning element for replacement of exhausted wax element.

According to another embodiment of the present invention, waxing apparatus is provided with a pair of wax positioning element and there is no contact between front face of wax element and said wax positioning element at the relief position. The face relief is in a shape such that it allows the wax element to pass through. The exhausted wax element is ejected out and replaced with new wax element at the relief position. Further, an end cap is provided to avoid falling of wax element from wax traverse guide during ejection through face relief. The thickness of multi step positioning element at each step defines the contact pressure between the face of wax element and running yarn. Advantageously, the contact force is more in level-3 when compared to level-2 and is minimum at level-1, whereas at level-Off yarn surface is out of contact with the wax element. The wax element is provided inside a housing, against a retaining means so that the wax element is continuously pushed towards the running yarn. The centre of said wax housing unit is provided with a stem shaft to guide and support the wax element when the retaining means pushes said wax element outwards. The textile machine includes air jet spinning, cone/chefese winding, open end spinning.

BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows the adjustable waxing apparatus according to the present invention wherein a plurality of positioning element is provided to vary the amount of wax application on the running yarn.
Figure 2 shows the perspective view of the waxing unit according to the present invention.
Figure 3 shows the sectional view of the waxing unit according to the present
invention.
Figure 4 shows the positioning element of the present invention where the plurality of positioning steps are provided.

DETAILED DESCRIPTION OF THE INVENTION
The waxing apparatus according to the present invention represented in Figure 1 comprises a waxing unit (1) where the running yarn (2) is being run over the wax element's (4) surface and passes over the yarn guide (3). Due to the tension of yarn and frictional force set by the positioning element (6), the amount of wax application on the yarn surface gets varied. Then the waxed yarn (5) travels further from the zone and then wound on as the package.

The detailed construction of the apparatus according to the present invention is shown in Figure 2 & Figure 3. The wax housing (7) of the waxing unit comprises the wax element (4) which is continuously pushed by a retaining means (12) towards the running yarn (2). Said continuous pushing action provides a constant pressures of wax surface onto the running yarn (2). So that the required amount of waxing is applied uniformly on the yarn surface, before it is being wound on the package.

Wax traverse guide (13) is mounted on the stem shaft (10) and is coupled to it. The retaining spring (12), wax element (4) and wax holder (15) are mounted on the wax traverse guide (13). The retaining means (12) pushes the wax. holder (15) with the waxinig element (4) against the positioning element (6). The stem shaft (10) is coupled to the driving means (14) which rotates the whole arrangement along with waxing element (4).

This rotatable provision offers a constant and uniform deterioration of wax element (4) during the course of operation. All the said arrangement is mounted in the wax housing (7), and in front of the said housing (7), there is also provided with at least a flank (9). The flank (9) portion is provided with a slot for mounting the pin (11) of the multi step positioning element (6), so that the said positioning element (6) is rotated in its axis while adjusting.

Positioning element (6) according to the present invention is shown in the Figure 4, Said positioning element (6) is having an approximate pentagonal shape wherein each face indicated with their corresponding steps for example, 1-2-3-Off and a Relief. The steps 1-2-3 of each faces denotes the contact frictional force between the wax element (4) and running yarn (2). For each steps, the contact face of the positioning element (6) is provided with corresponding profile wherein each profile is having its own unique thickness. Such thickness at each step, defines the contacting pressure between the face of wax element (4) and running yarn (2). And therefore the frictional force will be more in level-3 when compared to level-2 and is minimum at level-1 whereas the level-Off makes the yarn surface out of contact with the wax element (4) i.e., there is a recess created between the wax element (4) and the running yarn (2) during the level-Off, which means there will not be any wax application at this; step.

Subsequently there is one more step, where nothing is indicated and only provided with a face relief (8). At this position, there will not be any connectivity between the front face of the wax element (4) and positioning element (6). Said face relief (8) is provided substantially in a concave shape to allow the waxing element's (4) circumference to pass through. So that while complete exhaust of the wax element (4), said face relief (8) is being set in position by the operator and therefore the wax element (4) will be ejected out and replaced easily with new wax element without any hassle. After the replacement of the vyax element (4), the required step of the positioning element (6) is being set for further running of waxing unit. The end cap (16) is provided to avoid falling of waxing element (4) from wax traverse guide (13) after its ejection through face relief (8).

Since there is a provision available in the positioning element (6) itself for wax removal, it is not necessary to provide any holding sleeve with hinge and locking mechanism. Therefore the construction of the present invention is very simple and reliable as compared to the prior art. Since all waxing stages are able to be controlled through positioning element, the replacement of wax element is done very easily in a single step. Moreover the invention provides

great stability to the wax holder to keep the wax element in a secured position. Hence this foolproof mechanism of waxing device avoids the chance of running yarn waxing without proper locking of wax element and ensures even and effective wax application over the yarn.

In view of the present disclosure which describes the present invention, all changes, further modifications and variations within the meaning and range of equivalency are considered within the scope and spirit of the invention.

We claim:

1. Waxing apparatus for a textile machine comprising: a wax housing unit (7) with wax element (4);.
5 at least a wax positioning element (6) with a plurality of step like profiles to control the outward projection of wax element (4) with respect to the running yarn (2);
said steps having different thickness (1-2-3-Off) to provide varying amount of wax element (4) to the running yarn (2); 10 Characterized in that at least a face relief (8) is provided in said wax positioning element (6) for replacement of exhausted wax element (4).

2. Waxing apparatus as claimed in claim 1, wherein a pair of wax positioning element (6) is provided and there is no contact between front face of wax
15 element (4) and said wax positioning element (6) at the relief position (8).

3. Waxing apparatus as claimed in claim 1, wherein said face relief (8) is in a shape such that it allows the wax element (4) to pass through.

4. Waxing apparatus as claimed in claim 1, wherein exhausted wax element (4) is ejected out and replaced with new wax element at the relief position (8).

5. Waxing apparatus as claimed in claim 1, wherein end cap (16) is provided to avoid falling of wax element (4) from wax traverse guide (13) during 25 ejection through face relief (8):

6. Waxing apparatus as claimed in claim 1, wherein the thickness at each step (1-2-3-Off) defines the contact pressure between the face of wax element (4) and running yarn (2).

7. Waxing apparatus as claimed in claim 6, wherein the contact force is more in level-3 when compared to level-2 and is minimum at level-1, whereas at level-Off yarn surface (2) is out of contact with the wax element (4).

8. Waxing apparatus as claimed in claim 1, wherein the wax element (4) is provided inside a housing (7), against a retaining means (1.2) so that the wax element (4) is continuously pushed towards the running yarn (2).

9. Waxing apparatus as claimed in claim 8, wherein the centre of said wax housing unit (7) is provided with a stem shaft (10) to guide and support the wax element (4) when the retaining means (12) pushes said wax element (4) outwardly.

10. Waxing apparatuses claimed in claim 1, wherein said textile machine includes air jet spinning, cone/cheese winding, open end spinning.