Title of Invention

A NOSE BAR DEVICE FOR TEXTILE RING SPINNING AND TWISTING MACHINE

Abstract

The present invention provides an improved non-spherical nose bar device in a Textile Ring spinning and Twisting machine to provide guiding and tensioning arrangement for the bottom apron. The nose bar is disposed between the middle and front drafting rollers, with a tensioning arrangement provided for the tensioning of the short bottom apron. The nose bar device comprises primarily two parts, the nose bar member and the guide member. The nose bar member and the guide member are both mated together by snap-fitting to provide the tensioning that is required for effective working of the short bottom apron.

Full Text

NOSE BAR DEVICE FOR A TEXTILE RING SPINNING AND TWISTING MACHINE Technical Field The present invention relates to a non-spherical nose bar device for textile ring spinning and twisting machine to suitably accommodate short bottom aprons in the drafting zone. The invention more particularly relates to a non-spherical nose bar device that provides tensioning to the bottom apron to prevent slip of the fibre. Background and Prior art Ring spinning machines are used for the production of yam from the roving fed. Normally the ring spinning machine comprises a spindle rail to carry predetermined number of spindles arranged at predetermined pitch arranged on both side of the machine. The conical tubes on which the yam is wound are fitted to the spindles and driven by suitable drive means. Ring rails arranged coaxial to the spindle rail and carries spinning ring and traveler assembly of same number and pitch as that of spindle. The ring rails further provided with means for travel up and down in a direction traverse to the spindle axis for the built up of yarn on to the conical tubes attached to the revolving spindles. Roving bobbins of equal number as that of the spindles are arranged in a creel member attached to the ring spinning machine for the introduction of roving into the drafting arrangement, through suitable guide means for drafting. The drafted roving is subsequently wound on the conical tubes attached to the revolving spindles by the ring and ring traveler assembly and the cop built up takes place. US 5479680 "Sliver drafting apparatus", depicts a drafting apparatus for drafting a sliver in the yam spinning machine preferably comprises upper and lower inlet rollers , upper and lower apron belts, upper and lower apron belt guides and upper and lower outlet rollers. The upper apron belt passes around the upper inlet roller and the upper apron belt guide and the lower apron belt passes around the lower inlet roller and the lower apron belt guide and further guided around an apron guide roller and cooperates with the upper apron belt to define a nipping area between the belts for nipping the fiber sliver as it passes between the upper and lower inlet rollers while being sandwiched between the upper and lower apron belts The sliver is nipped in the nipping area and is subsequently directed by the belts to a nip formed between the upper and lower outlet rollers. The arrangement is such that the sliver is caused to move around a generally S-shaped path and is preferably trapped over the majority of the movement along this path between the two belts. This results in excellent guidance of the fiber and high uniformity of the spun yam. The apron guide roller provided to guide the lower apron among other things acts as a tensioner for the lower apron. The tension roller is incorporated to provide a necessary tension to the bottom apron and to provide a slip free movement of the bottom apron in the drafting zone to facilitate proper fibre control which is essential for the production of quality yam. Such an arrangement of bottom apron with tension arrangement provides limited enveloping of the bottom apron over the middle drafting roller. It is found in practice that more enveloping of the bottom apron over the bottom drafting roller will provide movement of the bottom apron over the nose bar with minimum slippage, which will be advantageous for proper guidance of the floating fibres in the drafting zone. Ring spinning machines employ drafting arrangement which is constructed with shorter aprons to enhance the enveloping of the bottom roller over the knurled portion of the bottom drafting roller to minimize the slip. Such known arrangements are not provided with tensioning arrangement for the tensioning of the bottom apron. This is disadvantageous due to the fact that the bottom aprons are likely to get elongated over a period of time of working. The elongation of the bottom apron results in the slip which will affect the quality of yam produced by the ring spinning frame. The elongation of bottom apron necessitates frequent changing. This is not only expensive but also will reduce the efficiency of the machine since the machine has to be essentially stopped for the replacement of the bottom aprons. More over such known arrangements are provided with plurality of nose bars, each such nose bar is provided to guide only two bottom apron of adjacent spindles. Since such arrangement employs more number of nose bar sections, the setting of the drafting zone is very difficult. Objects of the invention The primary object of the present invention is to provide a non-spherical nose bar device for a textile ring spinning frame with means provided for effective tensioning of the short bottom aprons. An object of the present invention is to provide a nose bar to cater to the staff length needed for ring spinning and textile machinery. Another object of the present invention is to provide a nose bar to provide better enveloping of the bottom apron over the middle drafting roller. Summary of the invention The present invention provides an improved non-spherical nose bar device in a Textile Ring spinning and Twisting machine to provide guiding and tensioning arrangement for the bottom apron. The nose bar device is disposed between the middle and front drafting rollers, with a tensioning arrangement provided for the tensioning of the short bottom apron. The nose bar device of the present invention comprises primarily two parts, a non-spherical nose bar member and a plurality of guide members. The nose bar member comprises a base having a plurality of through-holes and a plurality of projection-receptors. The guide members are provided to support two bottom aprons of adjacent spindles. The guide members have a plurality of projections to accommodate compression springs, and also have a plurality of lugs to provide a snap-on-fit. The nose bar member and guide members are mated together by snap-fitting the plurality lugs of the guides with a plurality of corresponding through-holes in the nose bar, and the projections in the guides having the compression springs are mated with the corresponding projection-receptors in the nose bar. The nose bar device provides the tensioning that is required for effective working of the short bottom apron. The improved nose bar device also provides more enveloping of the bottom apron over the middle drafting roller providing movement of bottom apron over the nose bar to prevent slippage, which is advantageous for proper guidance of the floating fibres in the drafting zone of the textile machines. Brief Description of the drawings Fig 1 illustrates a system depicting the drafting arrangement of fibre with top and bottom drafting rollers along with a non-spherical nose bar of the present invention. Fig 2 illustrates an arrangement of middle drafting roller and front drafting roller with a nose bar of the present invention fitted to a guide member to provide a tensioning to bottom apron. Fig 3 illustrates a rear isometric view of the nose bar device of the present invention displaying the nose bar member mated with a plurality of guide members. Fig 4 illustrates a front isometric view of the nose bar device displaying the nose bar member mated with a plurality of guide members along with the lugs. Fig 5 illustrates an isometric view of the nose bar device along with bottom aprons mounted on it. Fig 6 illustrates a front view and side view of the nose bar member of the present invention. Fig 7 illustrates front and side views of the guide member of the present the invention. Fig 8 illustrates a side view of the nose bar of the present invention fitted with a guide member. Detailed description of the invention The preferred embodiments of the present invention are now explained by referring to the accompanied figures. Referring, initially to Fig. 1, wherein, a complete system depicting the drafting arrangement (DA) is shown. The drafting arrangement (DA) is normally provided with rear bottom drafting roller (7), middle bottom drafting roller (1) and fi"ont bottom drafting roller (2) all being driven by suitable drive means. Guide arm (8) is provided to the drafting arrangement (DA) to support a plurality of top rollers (9a, 9b and 9c) and as well as to apply the required draft pressure on the bottom drafting rollers (1, 2 & 7). The fibre in the main drafting zone, ie. in the region between the middle drafting rollers (1,9b) and front drafting rollers (2,9a) is guided by the top apron (10) and bottom apron (5). The rotation of the middle bottom drafting roller (1) provides motion to the bottom apron (5) in the direction towards the front drafting rollers (2,9a). The top apron (10) is formed as an endless belt which envelops the top roller (9b) resting on the middle bottom drafting roller (1) and the apron cage (11). The bottom apron (5), which is also formed as an endless belt envelops the middle bottom drafting roller (1) and the nose bar member (3). When the top arm (8) is loaded, the top apron (10) attached to the top roller (9b) provided above the middle bottom drafting roller (1) makes contact with the bottom apron (5) attached to the rotating middle bottom drafting roller (1). The rotation of the bottom apron (5) rotates the top apron (10) in a direction towards the front drafting roller (2,9a). The top apron (10) also rotates the top roller (9b) in a direction towards the front drafting rollers (2,9a). The fibre (F) delivered fi'om the nip formed by the rear bottom drafting roller (7) and top roller (9c) is fed to the nip formed by the bottom apron (5) and top apron (10), The fibre is then guided to the nip formed by the front bottom drafting roller (2) and top roller (9a) by the bottom apron (5) and the top apron (10). The bottom drafting rollers (1, 2 & 7) are driven at differential speed by the drafting roller drive system and the fibre material is drafted as per the requirement. The drafted fibre is incorporated with necessary twist through its subsequent passage in the ring and ring traveler assembly and the yam is formed and wound on the conical tubes attached to the revolving spindles, the spindles being mounted on spindle rails of the Ring spinning and twisting machine and driven by the spindle drive arrangement. (Not shown in the figures) Now, by generally referring to Figs. 2-8; Fig. 2 depicts an arrangement of middle drafting roller (1) and front drafting roller (2) with the nose bar device (3) for providing the tensioning arrangement. Referring to Fig. 3 that depicts the rear isometric view of the nose bar device, showing a single nose bar member (3) mated with a plurality of guide members (4). A plurality of fins (4d) disposed at the rear edge of each guide member (4) at the point of intersections between the vertical arm and horizontal arm with intervening gaps in between the fins (4d) to guide the plurality of aprons (5). (As shown in Fig.5) The nose bar device as shown in Fig 4 is an illustration of the frontal isometric view of the nose bar member (3) snap-fitted with plurality of guide members (4). The snap-fitting is achieved by mating plurality of tong shaped lugs on the guide members (4) with the through holes (3b) (Fig. 7) of the nose bar member (3). Fig 5 is an isometric view of the nose bar device (3) depicting a plurality of aprons (5) mounted on the outer surface of said nose bar device. The aprons (5) are permitted to pass through the intervening gaps formed between the fin-shaped projections (4d) that are disposed on the rear end of the guide members (4). The intervening gaps between the fin projections (4d) are used to prevent the lateral movement of the aprons (5) during drafting sessions. This is more advantageous for proper guidance of the floating fibres in the drafting zone of the textile machines. The nose bar device (3) shown in Fig. 3, 6 and 8 is constructed to cater to the staff length. For instance, in the event of a textile ring spinning and twisting machine having 8 spindles of (not shown in these figures), the adoption of nose bar device (3) of the present invention simplifies the setting of the drafting zone. The Ring spinning and twisting machines are constructed in sections. The staff length is length of each section. The staff length varies depending on the requirement of the manufacturer of the ring frame. In the present invention, a system with 8-spindle staff length is adopted for illustrative purpose only. However, this should not be construed as limiting the scope of the present invention. The known devices with short apron are constructed with plurality of nose bars per section, where as in the present invention the nose bar is constructed to the full section length. The nose bar member (3) of the present invention comprises a pair of rectangular oppositely placed longer side walls disposed to form a flat-floored base form a base. The first side wall disposed vertically at right angle to floor of the base and the second side wall disposed at an obtuse angle to flat-floored base. A roof of the base extends laterally on both sides with one end of first side wall having protrusion and other end of the second side wall terminating as a butt. In a preferred embodiment the roof is partially elevated at the protrusion end and rests on the base to provide guiding path to the apron, alternatively the roof may be constructed as a curved surface. The nose bar member (3) is provided with plurality of projection-receptors (3a) and plurality of through-holes (3b) extending from first side wall to the second side wall of said base disposed adjacent to one another. One set of projection-receptors (3a) provided to accommodate the compression spring (6) from the guide members (4) and the second set of through-holes (3b) to provide a snap-on-fit to the lugs of the guide members (4) as shown in Fig. 8. The guide members (4) used in conjunction with the nose bar member (3) is shown separately in Fig. 7. Each such guide member (4) is provided to support two bottom aprons (5) of adjacent spindles. The plurality of guide members (4) is provided with a vertical and a horizontal arm disposed at obtuse angles to each other with the vertical arm longer than the horizontal arm. In the present invention as an exemplary embodiment a set of four guide members for each nose bar member. The number of guide members may vary depending upon the manufacturing and other parameters. The vertical and horizontal arms are arranged in the manner of the long back seat of the car with the back rest in a reclined position. A plurality of projections (4a) having blind holes (4b) within, is provided on the vertical arm of the guide members (4) to accommodate the compression spring (6). Each of the plurality of guide members (4) is further provided with a plurality of tong-shaped lugs (4c) disposed adjacent to the projections on the vertical arms to provide snap-on-fit when pressed into the plurality of through-holes (3b) arranged on the nose bar member (3). A plurality of fin-shaped projections (4d) disposed with intervening gaps on the rear end of the guide members (4) at the point of intersection of vertical and horizontal arms to provide guidance to the bottom apron (5). Fig 7 depicts the fitting of the nose bar member (3) to the plurality of guide members (4). The plurality of projections (4a) having compression springs (6) are inserted in a plurality of corresponding projection-receptors (3a) forming the first mating and the second mating is achieved by snap-fitting the plurality of tong-shaped lugs (4c) into the corresponding plurality of through-holes (3b). With this arrangement the guide members (4) are always held under pressure provided by the compression springs (6). Spring-loaded guide members (4) incorporated on the nose bar member (3) guides the apron (5) as well as acts as a tensioning member to provide tension to the bottom apron (5). Plurality of nose bar constructed as per the present invention with bottom aprons are assembled in the ring spinning machine using a conventional method. Since the nose bars are constructed to full staff length it is economical to manufacture and also it facilitates ease in the setting of the drafting zone. Another inventive feature of this invention is that the endless length of the bottom apron is adopted exactly as that of the top apron. This facilitates interchangeabihty of the bottom and top apron. This is more advantageous to the mills in the maintaining spares, since the need of maintaining separate spares of top apron and bottom aprons is eliminated. Advantages 1. The nose bar device of the present invention facilitates ease in the setting of the drafting zone. 2. The nose bar device of the present invention is provided with a tensioning means for tensioning of the short bottom aprons. 3. The nose bar device of the present invention facilitates interchangeabihty of the bottom and top apron in the system providing the advantage of reducing number of spare parts to be maintained. 4. The nose bar device of the present invention enhances the quality of yam produced due to minimum slippage of the bottom apron The tensioning arrangement of the bottom apron of the present invention is economical The forgoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since, modifications of the disclosed embodiments incorporating spirit and substance of the invention may occur to the persons skilled in the art, the invention should be construed to include everything within the scope of appended claims and equivalents thereof. We Claim 1. A nose bar device for guiding and tensioning of the bottom apron of a textile ring spinning and twisting machine, said nose bar device comprising; a plurality of guide members and a nose bar member, said guide members further comprising a horizontal arm and a vertical arm disposed at obtuse angles, a plurality of fins disposed at the rear edge of each guide at the point of intersections between the vertical arm and horizontal arm with intervening gaps in between the fins to guide the plurality of aprons, a plurality of cylindrical hollow projections disposed on the vertical arm of said guide member facing the rear side of the nose bar to house compression spring means to provide tensioning to apron, a plurality of tong shaped lugs disposed on said vertical arm adjacent to said hollow projections facing the rear side of the nose bar to provide snap fit locking means for the nose bar, a pair of rectangular oppositely placed longer side walls disposed to form a flat-floored base of said nose bar, the first side wall of the nose bar disposed vertically at right angle to floor of said base and the second side wall of the nose bar disposed at an obtuse angle to flat-floored base, a roof of said nose bar extending laterally on both sides of the base with one end of first side wall having protrusion and other end of the second side wall terminating as a butt in proximity to the guide member, a plurality of through-holes extending laterally from first side wall to the second side wall of said nose bar, a plurality of projection-receptors disposed on said nose bar adjacent to said through holes on the second side wall to receive projections of the guide member, and said nose bar disposed on the vertical arm of the guide member by snap-fitting the lugs of the guide member with said plurality of through-holes on said nose bar to form a primary mating and a mating of hollow projections on said guide member with plurality of projection-receptors on said nose bar to form a secondary mating to provide the required tensioning for the plurality of aprons. 2. The device as claimed in claim 1, wherein the nose bar is non-spherical. 3. The device as claimed in claim 1, wherein the length of the nose bar is equal to staff length of ring spinning and twisting machine. 4. The device as claimed in claim 1, wherein the material for the guide member is selected from nylon, glass fibre reinforced nylon, nylon with molybdenum disulphide. 5. The device as claimed in claim 1, wherein the compression spring means is selected from a leaf spring or a cup spring. 6. The device as claimed in claim 1, wherein the projection receptors and the through holes of nose bar consists of corresponding diameter profiles to permit the fitment of the projections of the guide member and lugs respectively. 7. The device as claimed in claim 1, wherein the roof of the nose bar is partially elevated at the protrusion end. 8. The device as claimed in claim 1, wherein the surfacial configuration of the roof of nose bar is optionally curved.

Documents:

304-che-2004-abstract.pdf

304-che-2004-claims.pdf

304-che-2004-correspondnece-others.pdf

304-che-2004-correspondnece-po.pdf

304-che-2004-description(complete).pdf

304-che-2004-description(provisional).pdf

304-che-2004-drawings.pdf

304-che-2004-form 1.pdf

304-che-2004-form 19.pdf