Title of Invention

APPARATUS AT A DRAW FRAME FOR SUPPLYING FIBRE SLIVERS TO A DRAWING MECHANISM COMPRISING AT LEAST TWO PAIRS OF ROLLERS .

Abstract

Apparatus at a draw frame for supplying fibre slivers to a drawing mechanism comprising at least two pairs of rollers, wherein the fibre slivers are fed to the drawing mechanism by a plurality of supply rollers mounted on a feed table, the fibre slivers-seen in a top view- running next to one another and towards one another laterally, and a guide element being provided between the feed table and the drawing mechanism, the lateral faces of which guide element are capable of directing the incoming fibre slivers laterally, characterized in that a sliver guiding means (17) is arranged across the width upstream of the guide elements (14,18a, 18b, 19a, 19b, 20) at a spacing (a, a) therefrom at which the fibre slivers (7a to 7g) are arranged substantially in a plane, the fibre slivers (7a to 7g) passing through beneath and in contact with the sliver-guiding means (17).

Full Text

Apparatus at a draw frame for supplying fibre slivers to a drawing mechanism comprising at least two pairs of rollers The invention relates to an apparatus at a draw frame for supplying fibre slivers to a drawing mechanism comprising at least two pairs of rollers, wherein the fibre slivers are fed to the drawing mechanism by a plurality of supply rollers mounted on a feed table, the fibre slivers - seen in a top view - running next to one another and towards one another latereilly, and a guide element being provided between the feed table and the drawing mechanism, the lateral faces of which guide element are capable of directing the incoming fibre slivers laterally. In a known apparatus, the guide element has two lateral faces which taper in towards one another, as a result of which the fibre slivers are guided laterally. In that arrangement, it happens that the fibre slivers arranged towards the outside are folded over one another. The fibre slivers are displaced upwards so that - in a side view - they are at different heights from one another, which can impair uniform transfer of the slivers and, especially, their horizontal orientation. Where the guide element includes, or is in the form of, a sliver thickness measuring element, sliver measurement can be impaired by the slivers' being folded over one another. The problem underlying the invention is therefore to provide an apparatus of the kind described at the beginning that avoids the mentioned disadvantages and, especially, that allows uniform transfer of the slivers and enables the slivers to be oriented substantially in a plane. The problem is solved by the characterising features of claim 1. As a result of the sliver-guiding means according to the invention, the fibre slivers are held down at a location in which they are still oriented substantially in a plane, that is to say in which the slivers arranged to the outside have not yet been folded over one another and over slivers arranged further to the inside. As a result it is ensured that the group of fibre slivers has a level orientation, which is important for entry into the nip of the pair of take-in rollers of the drawing mechanism. When a measuring element for determining thickness variations either in the fibre sliver group consisting of several slivers or for individual sliver measurement is provided between the feed table and the drawing mechanism, measuring the fibre slivers next to one another in a plane is highly advantageous. It is also advantageous for the apparatus according to the invention to be provided upstream of the drawing mechanism, upstream of the measuring element and/or upstream of a guide element directing the fibre slivers laterally. Claims 2 to 26 contain advantageous developments of the invention. The invention will be described hereinafter in greater detail with reference to exemplary embodiments shown in the drawings, in which: Fig. 1a shows, in a diagrammatic side view, a draw frame with the apparatus according to the invention between the feed table and the drawing mechanism; Fig. 1b is a top view in accordance with Fig. 1a; Fig. 2 shows, in a perspective view, guidance of the fibre slivers at the exit from the feed table; Fig. 3 shows, in a perspective view, a sliver guide with a sliver-guiding means arranged upstream in accordance with the invention; Fig. 4 shows an eccentrically mounted sliver- guiding means; Fig. 5 shows a two-sided sliver-guiding means wherein the through-gap for the slivers is adjustable; Fig. 6a shows, in a top view, a sliver guide for a plurality of fibre slivers with a pre-former, upstream of which is arranged a sliver-guiding means according to the invention; Fig. 6b shows the sliver guide according to Fig. 6a, through the section I - I; Fig. 7a shows, in a top view, an individual sliver guide with a directing element and with a sliver-guiding means according to the invention arranged upstream; and Fig. 7b shows the individual sliver guide in cross-section. The side view according to Fig. la shows the feed region 1, the measurement region 2, the drawing mechanism 3 and the sliver coiling 4 of a draw frame, for example a Triitzschler TD 03 draw frame. In the feed region 1, three spinning cans 5a to 5c (circular cans) of a draw frame are arranged below the sliver feed table 6 (creel) in two rows of cans (see Fig. lb); the feed slivers 7a to 7c are drawn off by means of supply rollers 8a to 8c and supplied to the drawing mechanism 3. With each driven supply roller 8a to 8c there is associated a top roller 9a to 9c, which rotates together with the supply roller. Located in the region of the feed table are six roller pairs 8, 9 (cf. Fig. lb), each consisting of a top roller and a supply roller. Fibre slivers 7a to 7c are lifted out of the spinning cans 5a to 5c and guided on the feed table 6 towards the draw frame. After passing through the drawing mechanism 3, the attenuated fibre sliver 7' reaches a revolving plate of a can coiler and is deposited in rings in the delivery can. The feed table 6 extends over the region of the entire sliver feed apparatus as far as the draw frame. One fibre sliver 7 is supplied to the draw frame from each of the spinning cans 5 by means of the fibre sliver feed apparatus. In each case, supply is carried out through a sliver feed location, each sliver feed location having a roller pair 8a, 9a; 8b, 9b; 8c, 9c (roller feed). In the region of each lower roller 8a to 8c, there is a guide member (not shown) for guiding the fibre slivers 7. Reference letter A denotes the running direction of the fibre slivers 7a, 7b and 7c. The fibre slivers 7a to 7c are nipped between the roller pairs 8, 9. Curved arrows denote the direction of rotation of the supply rollers 8a to 8c and the top rollers 9a to 9c. Each supply roller 8 is connected to a drive device. At the exit from the feed table 6 there is provided a guide device for the fibre slivers 7a to 7f, which guide device consists of a horizontal rod 10 of cylindrical cross-section, on the rear face of which there are fixed eight cylinders 11a to 11h. The axes of the cylinders 11a to 11h are oriented vertically and the spacing between the outer surfaces of the cylinders 11a to 11h is large enough for a fibre sliver 7a to 7f to pass through in each case without being impeded in its running. By that means, guide grooves which are open to the top are formed for the fibre slivers 7a to 7f, that is to say the cylinders 11a to 11h have the function of guide members. Arranged downstream from the feed table 6 at the entry to the draw frame is a driven roller arrangement, for example two lower rider rollers 12a, 12b and three upper rider rollers 13. In accordance with Fig. 1b, on each side of the feed table 6 there is set out a row of three spinning cans 5 (not shown), each parallel to the other. In operation, a fibre sliver 7 can be drawn out of all six spinning cans 5 at the same time. In operation, it is, however, also possible so to proceed that the fibre sliver 7 is drawn off on only one side, for example from the three spinning cans 5a to 5c, while the three spinning cans 5d to 5f on the other side are being replaced. Furthermore, on each side of the feed table 6, there are three supply rollers 8a, 8b, 8c and 8d, 8e, 8f, in each case arranged behind one another in the working direction A. Two supply rollers 8a, 8d; 8b, 8e; 8c, 8f are, in each case, arranged coaxially with respect to one another. The supply rollers 8a to 8f have the same diameter, for example 100 mm. The speeds of rotation n of the supply rollers decrease in the working direction A, that is to say n1 > n2 > n3. In that manner, the circumferential speeds U of the supply rollers 8 decrease in the working direction A. As a result, it is possible to adjust individually the circumferential speeds U1, U2, U3 of the supply rollers 8 so that the feed tensioning of all the fibre slivers 7 can be as desired. The supply rollers 8 can be driven by way of gear trains or like transmission devices (not shown). The supply rollers 8 are, in each case, of two-part construction (in a manner known per se) and are of lengths that differ from one another. The length of the fibre slivers 7 in the feed region 1 decreases from the inside towards the outside. According to Figs, 1a, 1b, the fibre slivers 7a to 7f run from the feed table 6 of the feed region 1, by way of the guide device (rod 10, cylinders 11a to 11h), through the rider roller arrangement 12, 13, through the sliver guide 14 (including the measuring device) having the transport rollers 15, 16, through the drawing mechanism 3, the web guide, the sliver funnel having the draw-off rollers and the rotating plate, and into the can. Fig. 1b shows the rollers that are arranged, in each case, on the underneath side, 8a to 8f, 12a, 12b, 15, III, II and I. According to Fig. 1b, the fibre sliver group 7' comprising six fibre slivers 7 is subjected to entry creel tensioning in the region between the roller pairs 8, 9 and the rider roller apparatus 12, 13; the fibre sliver group 7' comprising six fibre slivers 7 is subjected to rider roller tensioning in the region between the rider roller arrangement 12, 13 and the transport rollers 15, 16; and the fibre sliver group 7'' comprising six fibre slivers 7 is subjected to transport roller tensioning in the region between the transport rollers 15, 16 and the intake rollers 26, III of the drawing mechanism 3. As Fig. lb shows in a top view, the fibre slivers 7a to 7f run towards one another between the cylinders 11a to 11h and the draw-off rollers 15, 16. In the process, the fibre slivers 7a to 7f run towards one another in a first step between the cylinders 11a to 11h and the entry to the sliver guide 14 (guide element) and are brought further in towards one another by the conically tapering side walls of the sliver guide 14. A sliver-guiding means 17 (holding- down means) is arranged across the width upstream of the sliver guide 14 at a spacing a therefrom at which the fibre slivers 7a to 7f are arranged substantially in a plane (see Fig. la), that is to say the outer fibre slivers 7a and 7f have not been folded over. The spacing a can be about from 5 to 40 mm, preferably from 10 to 15 mm. The sliver-guiding means 17 is in the form of a bar, is rounded off on its underside and has a smooth surface. In accordance with Fig. 2, at the end of the draw frame creel, the fibre slivers 7a to 7c are passed through the guide grooves, which are open to the top, between the guide members 11a to lid. The fibre slivers 7a to 7c - seen in the work direction A - run towards one another in somewhat tapering manner. According to Fig. 3, a sliver-guiding means 17 in the form of a bar extending across the width is arranged upstream of the entry to the sliver guide 14 at a spacing therefrom. The fibre slivers 7a to 7f pass through beneath and in contact with the sliver-guiding means 17. Fig. 4 shows an arrangement in which the sliver-guiding means 17 is eccentrically mounted at its two ends in mountings 18a, 18b (only 18a is shown). As a result of rotation (see curved double arrows) the width b of the through-gap b for the fibre slivers 7 can be adjusted. In accordance with Fig. 5, the sliver-guiding means is of two-part construction wherein a lower component part 17b is stationary, above which the sliver-guiding means 17a is mounted in adjustable manner so that the width b of the through-gap for the fibre slivers 7 can be adjusted. In accordance with Fig. 6a, a pre-former 19a, 19b having two lateral faces convexly curving in towards one another is arranged upstream of the sliver guide 14. The pre-former has no top or bottom surface, that is to say it is open to the top and bottom. At one of its ends, however, the lateral faces can be pivoted around a rotary linkage about a vertical axis. The lateral faces taper towards one another in the direction of the entrance opening of the sliver guide 14. Reference numerals 7a to 7g denote the entering fibre slivers, and 7 denotes the emerging fibre slivers. Arranged upstream of the pre-former 19a, 19b is a sliver-guiding means 17 according to the invention. Fig. 6b shows the inwardly tapering inner walls between the entrance and exit of the sliver guide 14. Associated with the sliver guide 14 is a sensing tongue 22 for measuring the thickness of the fibre slivers. According to Fig. 7a, a measuring device 20, for example a microwave measuring device, is provided for individual sliver (thickness) measurement of the fibre slivers 7a to 7f. Arranged upstream of the measuring device 20 is a two- part directing element 18a, 18b, upstream of which is a sliver-guiding means 17 according to the invention. We Claim.- 1. Apparatus at a draw frame for supplying fibre slivers to a drawing mechanism comprising at least two pairs of rollers, wherein the fibre slivers are fed to the drawing mechanism by a plurality of supply rollers mounted on a feed table, the fibre slivers -seen in a top view- running next to one another and towards one another laterally, and a guide element being provided between the feed table and the drawing mechanism, the lateral faces of which guide element are capable of directing the incoming fibre slivers laterally, characterized in that a sliver guiding means (17) is arranged across the width upstream of the guide elements (14,18a, 18b, 19a, 19b, 20) at a spacing (a, a) therefrom at which the fibre slivers (7a to 7g) are arranged substantially in a plane, the fibre slivers (7a to 7g) passing through beneath and in contact with the sliver-guiding means (17). 2. Apparatus as claimed in claim 1, wherein the spacing (a) between the sliver-guiding means and the guide elements is from about 5 mm to 40 mm. 3. Apparatus as claimed in either claim 1 or claim 2, wherein the spacing (a) is from 10 to 15 mm. 4. Apparatus as claimed in any one of claims 1 to 3, wherein the sliver- guiding means is of elongate construction. 5. Apparatus as claimed in any one of claims 1 to 4, wherein the sliver- guiding means is in the form of a bar or the like. 6. Apparatus as claimed in any one of claims 1 to 5, wherein the sliver- guiding means is made from steel. 7. Apparatus as claimed in any one of claims 1 to 6, wherein the sliver- guiding means has a circular, semi-circular or oval cross-section. 8. Apparatus as claimed in any one of claims 1 to 7, wherein the sliver- guiding means is rounded off on its face which is in contact with the slivers. 9. Apparatus as claimed in any one of claims 1 to 8, wherein the sliver- guiding means has a smooth surface on its face which is in contact with the slivers. 10. Apparatus as claimed in any one of claims 1 to 9, wherein the face which is in contact extends parallel to the fibre slivers. 11. Apparatus as claimed in any one of claims 1 to 10, wherein the fibre slivers seen in a side view are at an obtuse angle before and after the sliver guiding means. 12. Apparatus as claimed in any one of claims 1 to 11, wherein the sliver guiding means is mounted in the region of each of its two ends. 13. Apparatus as claimed in any one of claims 1 to 12, wherein the sliver guiding means is adjustable in the height direction by means of an adjusting device. 14. Apparatus as claimed in any one of claims 1 to 13, wherein the sliver-guiding means is eccentrically mounted. 15. Apparatus as claimed in any one of claims 1 to 14, wherein the sliver-guiding means is adjustable for different sliver finenesses. 16. Apparatus as claimed in any one of claims 1 to 15, wherein the sliver-guiding means is of two part construction, the fibre slivers passing through the longitudinal gap between the two parts. 17. Apparatus as claimed in any one of claims 1 to 16, wherein the slivers seen in a top view run at an angle relative to the longitudinal axis of the sliver-guiding means. 18. Apparatus as claimed in any one of claims 1 to 17, wherein the outer surface of the sliver-guiding means is cylindrical. 19. Apparatus as claimed in any one of claims 1 to 18, wherein the outer surface is concavely recessed over its length. 20. Apparatus as claimed in any one of claims 1 to 19, wherein the guide element is the tapering sliver guide of a draw frame. 21. Apparatus as claimed in any one of claims 1 to 20, wherein the sliver guide is in the form of a thickness-sensing apparatus, for example a measurement funnel having a mechanical sensing lever. 22. Apparatus as claimed in any one of claims 1 to 21, wherein downstream of the sliver guide there is arranged a thickness-sensing apparatus, for example tongue and groove sensing rollers (draw-off rollers). 23. Apparatus as claimed in any one of claims 1 to 22, wherein the guide element is in a form for individual sliver sensing. 24. Apparatus as claimed in any one of claims 1 to 23, wherein the a microwave sensing device is used for individual sliver sensing. 25. Apparatus as claimed in any one of claims 1 to 24, wherein upstream of the guide element there is arranged a pre-former, which is capable of bringing together laterally the fibre slivers entering the guide element and of directing them. 26. Apparatus as claimed in any one of claims 1 to 25, wherein the sliver-guiding means is in the form of a holding-down means. Apparatus at a draw frame for supplying fibre slivers to a drawing mechanism comprising at least two pairs of rollers, wherein the fibre slivers are fed to the drawing mechanism by a plurality of supply rollers mounted on a feed table, the fibre slivers-seen in a top view- running next to one another and towards one another laterally, and a guide element being provided between the feed table and the drawing mechanism, the lateral faces of which guide element are capable of directing the incoming fibre slivers laterally, characterized in that a sliver guiding means (17) is arranged across the width upstream of the guide elements (14,18a, 18b, 19a, 19b, 20) at a spacing (a, a) therefrom at which the fibre slivers (7a to 7g) are arranged substantially in a plane, the fibre slivers (7a to 7g) passing through beneath and in contact with the sliver-guiding means (17).

Documents:

547-KOL-2004-(07-12-2011)-FORM-27.pdf

547-KOL-2004-(13-08-2012)-FORM-27.pdf

547-kol-2004-abstract.pdf

547-kol-2004-claims.pdf

547-kol-2004-correspondence.pdf

547-kol-2004-description (complete).pdf

547-kol-2004-drawings.pdf

547-kol-2004-examination report.pdf

547-kol-2004-form 1.pdf

547-kol-2004-form 18.pdf

547-kol-2004-form 2.pdf

547-kol-2004-form 26.pdf

547-KOL-2004-FORM 27.pdf

547-kol-2004-form 3.pdf

547-kol-2004-form 5.pdf

547-kol-2004-granted-abstract.pdf

547-kol-2004-granted-claims.pdf

547-kol-2004-granted-correspondence.pdf

547-kol-2004-granted-description (complete).pdf

547-kol-2004-granted-drawings.pdf

547-kol-2004-granted-examination report.pdf

547-kol-2004-granted-form 1.pdf

547-kol-2004-granted-form 18.pdf

547-kol-2004-granted-form 2.pdf

547-kol-2004-granted-form 26.pdf

547-kol-2004-granted-form 3.pdf

547-kol-2004-granted-form 5.pdf

547-kol-2004-granted-priority document.pdf

547-kol-2004-granted-reply to examination report.pdf

547-kol-2004-granted-specification.pdf

547-kol-2004-granted-translated copy of priority document.pdf

547-kol-2004-priority document.pdf

547-kol-2004-reply to examination report.pdf

547-kol-2004-specification.pdf

547-kol-2004-translated copy of priority document.pdf