Claims:WE CLAIM:
1. A Roving tension control device for spinning machines, said roving tension control device (11) comprises a main body (12) and a load absorbing resilient means (13) characterized in that, said main body (12) consists an annular member (14) and side walls (15, 16), said annular member (14) consists a support member (21) with a slot (21a) and a support bed (22), the resilient means (13) is mounted in said support member (21).

2. The tension control device as claimed in claim 1, characterized in that, the resilient means (13) is a spring plate and the top end of said spring plate consists a flat portion (13a), a bend portion (13b) and a semi annular portion, said semi annular portion of said spring plate (13) is in convex shape.

3. The tension control device as claimed in claim 1, characterized in that, said side walls (15, 16) have extended wall portion (15a, 16a) and a guide member (23) is provided in the top part of extended wall portion.

4. The tension control device as claimed in claim 1, characterized in that, the resilient means (13) is made up of ball bearing steel of polymer material.

5. The tension control device as claimed in claim 1, characterized in that, the centre portion of the roving tension control device (11) has a hollow portion (17) and a sleeve (20) is replaceably mounted inside the hollow portion (17).

6. The tension control device as claimed in claim 1, characterized in that, the main body (12) is made up of polymer or any rubber, metal, alloy or composite materials.

7. The tension control device as claimed in claim 1, characterized in that, the shape of the device (11) is annular or square or rectangular.

8. The tension control device as claimed in claim 1, characterized in that, said main body (12) is the Roving guide rod (52), said guide rod (52) consists a slot (54) and the resilient means (53) is mounted in the slot portion of the guide rod (52).

9. The tension control device as claimed in claim 1, characterized in that, plurality of the spring (53) and slot (54) arrangements are provided in alternative direction in the Roving guide rod (52). , Description:FIELD OF THE INVENTION
The present invention relates to spinning machines. Particularly the present invention relates to ring spinning machines. Still particularly, the present invention relates to a tension control device to control the fibre material quality by maintaining uniform tension in ring spinning machines.

BACKGROUND OF THE INVENTION
The roving bobbins required for feeding Ring spinning machines are produced in the Roving machines. The non-twisted fibre strand in the form of sliver is fed into the roving machines; thinned down by drafting; and slightly twisted to form as a Roving. The Roving material delivered from the drafting zone is wound into the bobbins. A package of roving bobbin contains up to 4000 meters of roving material and the weight of full roving bobbin comes around 1.50 to 3.0 kilograms. These roving bobbins are transferred to spinning department for further processes.

The Roving bobbins are mounted in the bobbin holding devices provided in the Ring spinning machine creel. Each spindle in the Ring spinning machine requires a Roving bobbin and the modern spinning machine consists at least 1000 spindles per machine. The bobbin holding devices are freely rotatable therefore the bobbin rotates freely when the roving material is pulled out by the drafting rollers.

The disadvantage of the existing system is, the bobbins are negatively driven by pulling the roving material. The weight of the full bobbin is around 3.0 kgs. When the roving pulls the bobbin for unwinding, a certain amount of load is applied in the Roving. As the twist applied on the roving is very minimum (0.5 to 2.0 twists per inch), the load applied on the roving material leads to form thin places in the roving due to tension. When the load increases than the fibre to fibre friction co-efficient, fibre slippage takes place. If the tension is too high, the roving gets broken. If the roving tension is higher but not the maximum, finer mass variation takes place due to fibre shifting or slippage. This variation of mass in the roving material affects the delivered yarn quality. Particularly, the long thin places and extra sensitive thin places are considerably increased.

As the roving material is continuously supplied for spinning, the mass of Roving bobbins are varied continuously from 200 grams to 3000 grams. This variation results in variation of load applied on the Roving during unwinding. This tension variation is one of the major reason for the variation in yarn quality and its consistency.

To overcome the Roving tension variation, Roving bobbin holding device is the only solution available in existing art. Though very few efforts have been made, it did not commercialized due to the implementation difficulties. Chinese utility model patent application 201864837 filed by CHANGZHOU TEXTILE GARMENT INST on Nov 23, 2010 describes a Rotatable yarn guide device for spinning frame. Since the yarn guide rod is rotatable, the lower yarn guide rod can rotate synchronously along with backing-off of roving during spinning, the contact mode between the roving and the yarn guide rod is changed into rolling friction from curve sliding friction. This method requires an additional driving arrangement to rotate the guide rods which increases the cost of machine.

Indian patent application 201641031644 discloses a tension control device to control the fibre material quality by maintaining uniform tension in ring spinning machines. The tension control device comprises at least a main body and a resilient means preferably a spring. The main body did not have any provision to hold the feed material and it led to improper guidance and material flow. Also, the spring plate shape was in flat manner which resulted in slippage of roving material. The shape of the spring did not absorb the tension of roving material and resulted in improper tension control.

Therefore, with the foregoing in mind, the present invention is directed to provide an improvement in the existing Roving guiding device for ring spinning machines which is not afflicted with the aforementioned shortcomings and drawbacks of the prior art.

OBJECT OF THE INVENTION
It is a primary object of the present invention is to provide a roving tension control device for ring spinning machines.
More specific object of the present invention aims at the provision of roving tension control device for a ring spinning machine to improve the delivery product quality, while eliminating the drawbacks of the prior art.

Another and more specific object of the present invention aims at the provision of a roving tension control device to minimize the Roving tension to enhance the yarn quality through maintaining uniform tension.

Still another object of the present invention aims at the provision of a roving tension control device to maintain uniform Roving tension with relevant to variable bobbin weight.

SUMMARY OF THE INVENTION
The following presents a simplified summary of the invention in order to provide a basic understanding of some aspects of the invention. This summary is not an extensive overview of the present invention. It is not intended to identify the key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concept of the invention in a simplified form as a prelude to a more detailed description of the invention presented later.

According to the main embodiment of the present invention, a Roving tension control device for spinning machines is developed to control the and maintain the uniform roving tension and said tension control device comprises a main body and a load absorbing resilient means. Said main body consists an annular member and side walls, said annular member consists a support member with a slot and a support bed. A resilient means is mounted in said support member. The resilient means is a spring plate and the top end of said spring plate consists a flat portion a, a bend portion b and a semi annular portion, said semi annular portion of said spring plate is in convex shape. The resilient means is made up of ball bearing steel of polymer material.

According to another aspect of the present invention, said side walls, have extended wall portion and a guide member is provided in the top part of extended wall portion. The centre portion of the roving tension control device has a hollow portion and a sleeve is replaceably mounted inside the hollow portion. The shape of the device is annular or square or rectangular and the main body is made up of polymer or any rubber, metal, alloy or composite materials.

According to still further aspect of the present invention, said main body is preferably a Roving guide rod, said guide rod consists a slot and the resilient means is mounted in the slot portion of the guide rod. Plurality of the spring and slot arrangements are provided in alternative direction in the Roving guide rod.

BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood and objects other than those set forth above, will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein:

FIG. 1 illustrates the Ring spinning machine known in the existing art.

FIG. 2 illustrates the isometric view of roving tension control device in accordance with the present invention.

FIG. 2a illustrates the exploded view of roving tension control device in accordance with the present invention.

FIG. 2b illustrates the front view of roving tension control device in accordance with the present invention.

FIG 2c illustrates the side view of roving tension control device in accordance with present invention.

FIG. 3 illustrates the isometric view of roving tension control device in accordance with another embodiment of the present invention.

FIG. 3a illustrates the exploded view of roving tension control device in accordance with another embodiment of the present invention.

Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure. Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures.

DETAILED DESCRIPTION OF THE DRAWINGS
Describing now the drawings, it is to be understood that only enough of the construction of the ring spinning machine, and specifically the roving guide with the associated creel have been depicted therein, in order to simplify the illustration, as needed for those skilled in the art to readily understand the underlying principles and concepts of the present invention.

The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and sprit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments and/or in combination with instead of the features of the other embodiments.

FIG. 1 is a part of Ring spinning machine in accordance with the present invention. The Ring spinning machine (1) comprises a creel portion (2) where a plurality of roving bobbins (3) is mounted on the bobbin holding devices (4). The Roving (5) material from each bobbin are fed into the drafting zone (6) through feeding condensers (7). Each of the roving materials from the bobbins are guided through the guide rods (8a, 8b) and fed into the back drafting rollers of the drafting zone through the roving condensers (7). Each spinning stations require one roving feed and said spinning station converts the drafted fibre strand into yarn (9) and wound on the spinning bobbins.

FIG 2, 2a, 2b and 2c describes the Roving tension control device (11) in accordance with the present invention. Said roving tension control device (11) comprises a main body (12) and a load absorbing resilient means (13). The main body (12) consists an annular member (14) and said groove is formed by means of side walls (15, 16). The centre portion of the roving tension control device (11) has a hollow portion (17). The diameter of the hollow part is equivalent to the outer diameter of Roving guide rod (8a, 8b). The back portion of the main body (12) consists a hole (18) with thread to mount the fastener (19). The fastener supports to mount the roving tension control device (11) rigidly on the roving guide rod (8a, 8b). A sleeve (20) shall be provided inside the hollow portion (17) to mount the tension control device (11) rigidly on the guide rod (8a, 8b). This sleeve supports in case of size variation in the outer diameter in guide rods (8a, 8b).

The upper portion of the annular member (14) consists a support member (21) with a slot (21a). The middle front portion of the annular member (14) consists a support bed (22) to support the resilient means (13) such as spring plate. According to the main aspect of the present invention, said resilient means (13) is preferably semi annular in shape and top end of said spring plate consists a flat portion (13a), a bend portion (13b) and curved convex portion (13c). The bend portion (13b) is inserted into the slot (21a) of the support member (21). The flat portion (13a) is supported by the support bed (22). The spring plate (13) is preferably made in a convex shape to guide the roving material and to reduce the friction.

According to the present invention, the side walls (15, 16) have extended wall portion (15a, 16a). In the top part of extended wall portion (15a, 16a), a guide member (23) is provided to guide the roving material.

The resilient means (13) is preferably made up of ball bearing steel. The main body (12) shall be made up of polymer or any rubber, metal, alloy or composite materials. The shape of the Roving tension control device (11) is not only limited to annular but also any suitable shapes for example square or rectangular.

Fig 3 and 3a illustrates another embodiment of tension control device (11) of the present invention. In this embodiment, the main body (12) is replaced with the Roving guide rod (52). The resilient means (53) is mounted on the guide rod (52). Said guide rod (52) consists a slot (54) to mount the spring (53) and a slot (55) in the guide rod wall to hold the spring. The spring (53) is inserted into the slot (54). In this preferred embodiment, the spring (53) and slot (54) arrangements are provided in alternative direction. Also, the spring (53) used in this embodiment is preferably in convex shape and made up of ball bearing steel. The plurality of slots (54) can be made in existing guide rods (8a, 8b).

The present invention has many advantages and overcomes the problems present in the existing system. The Bobbin holders cannot control the unwinding tension with relevant to bobbin weight variation. The existing Roving guide rods creates friction and there by increases tension. The Roving tension control device according to the present invention absorbs the tension applied on the roving material and ensures minimum and uniform yarn tension. This helps to improve the delivery yarn quality, minimizes the roving breakages and results in waste reduction and also productivity improvement.

In view of the present disclosure which describes preferred and best modes for providing an apparatus for reducing the fibre strand tension in spinning machines speed frames, Ring spinning machines, winding and doubling machines. Modifications and variations would present themselves to those skilled in the art without departing from the scope and spirit of this invention. Any modifications and variations coming within the meaning and range of equivalency are considered within the scope.