Title of Invention

DEVICE ON A DRAW FRAME FOR TEXTILE SLIVERS, HAVING ROLLER PAIRS ARRANGED ONE AFTER THE OTHER AND A CLEANING DEVICE FOR EACH UPPER ROLLER

Abstract

Device on a draw frame for textile slivers, having roller pairsarranged one after the other and a cleaning device, for example acleaning lip, cleaning rod, for each upper roller, in which the loading device for each upper roller has at least two presser elements, for example pneumatic cylinders, each having a reciprocating component, for example a presser rod, piston rod, and the cleaning device is mounted on the loading device, characterized in that each cleaning device (21) is mounted by its ends on a presser rod (19, 19a, 19b) and the presser rod (19, 19a, 19b) has a bearing element (28a, 28b) for the cleaning device (21).

Full Text

Device on a draw frame for textile slivers, having roller- pairs arranged one after the—other and a cleaning device for each upper roller The invention relates to a device on a draw frame for textile slivers, having roller pairs arranged one after the other and a cleaning device, for example a cleaning lip, cleaning rod, for each upper roller, in which the loading device for each upper roller has at least two presser elements, for example pneumatic cylinders, each having a reciprocating component, for example? a presser rod, piston rod, and the cleaning device is mounted on the loading device. The draw frame is used to draft slivers, the slivers being clamped between two roller pairs with different rotational speeds. The roller pairs generally consist of a lower roller of steel and an upper roller having a resilient covering. The resilient covering has a tendency to wind up the silver. This is a very gradual process and begins with the picking-up of individual fibres. In order to avoid winding-up, attempts are made to remove these individual fibres from the upper roller and supply them to an extraction device by means of a cleaning bar (cleaning rod), which is usually round. The cleaning bar and the upper roller have to be arranged as far as possible axially parallel, so that linear contact is achieved. Otherwise the contact between the two compo- nents would be confined to a point and the cleaning action would thus be markedly reduced. The guidance of the cleaning bar is generally effected by additional elements having guide grooves which have to be positioned relative to the upper roller. In a known device (DE 198 07 801) a holder for receiving a cleaning lip for the upper roller is provided on the pressure cylinder. When the loading device is pivoted away, the cleaning lip can also be pivoted away therewith. The holder has an elongate hole in which a journal of the cleaning lip is guided. A disadvantage is that when the upper roller bearing is relieved of load, that is to say when the piston rod has been lifted away from the upper roller bearing but the cylinder is still in position, the cleaning bar remains lying on the rubber covering of the upper roller. The rubber covering has an elevated operating temperature and is frequently sticky with honeydew, resulting in an undesirable linear load on the stationary rubber covering. A further problem is that the mounting arrangement of the journal of the cleaning lip in a vertical elongate hole on each side of the upper roller can give rise to a clamping moment. In practice, fibre material can become lodged in the elongate hole, namely between the journal and the inner walls of the elongate hole. As a result, the cleaning bar is unable to move away from the rubber covering. The invention is therefore based on the problem of providing a device of the kind described at the beginning which avoids the mentioned disadvantages, which especially avoids impairment of the resilient covering of the upper roller when the piston rod is raised and which allows adaptable and stable guidance and mounting. This problem is solved by the characterising features of claim 1. Because the cleaning bar is associated with the presser rods, when the presser rods are relieved of load and subsequently lifted away from the upper roller bearings, the cleaning bar is lifted away1 from the rubber covering. Local pressure on the rubber covering is thus avoided. In addition, the scope for horizontal movement of the cleaning bar on the piston rods allows adaptable and stable guidance/mounting of the cleaning bar. Because the cleaning bar is exactly positioned relative to the upper roller, a better cleaning performance is achieved, the build-up of windings is reduced and thus the efficiency of the machine is increased. The reduction in the number of components (guide elements) reduces soiling in the drafting system and consequently increases the intervals between cleaning operations. Claims 2 to 2 9 include advantageous developments of the invention. The invention will be described in greater detail below with reference to embodiments shown in the drawing. Fig. 1 is a diagrammatic side view of a drafting system of a draw frame having the device according to the invention, Fig. 2 shows part of Fig. 1 in section, corresponding to line K-K (Fig. 1), with a pneumatic upper roller loading device, Fig. 3 is a perspective view of a presser arm with integral housing, two presser rods and a cleaning bar, and Figs 4a, 4b show a presser rod with a turned groove (Fig. 4a) and an engaged O-ring (Fig. 4b). Fig. 1 shows a drafting system S of a draw frame, for example a Trutzschler Strecke HSR. The drafting system S is configured as a 4 over 3 -drafting system, that is to say it consists of three lower rollers I, II, III (I output lower roller, II middle lower roller, III input lower roller) and four upper rollers 1, 2, 3, 4. In the drafting system S, the drafting of the fibre bundle 5, which consists of a plurality of slivers, is carried out. The drafting operation is composed of the preliminary drafting operation and the main drafting operation. The roller pairs 4/III and 3/II form the preliminary drafting zone and the roller pairs 3/II and 1,2/i form the main drafting zone. The output lower roller I is driven by the main motor (not shown) and thus determines the delivery speed. The input and middle lower rollers III and II are driven by a regulating motor (not shown) . The upper rollers 1 to 4 are pressed against the lower rollers I, II and III by presser elements 91 to 94 (loading device) in presser arms 11a to l1d which are rotatable about pivot bearings (see Figs 3 and 4) and are thus driven by way of frictional engagement. The direction of rotation of the rollers I, II, III; 1, 2, 3, 4 is indicated by curved arrows. The fibre bundle 5, which consists of a plurality of slivers, runs in direction A; the lower rollers I, II, III are mounted in stands 14 (see Fig. 2) which are arranged on the machinery frame 15. According to Fig. 2, the pneumatic cylinder 9 is associated at the top with a support element 12a and at the bottom with a holding element 13a. The pneumatic cylinder 9 forms a cylinder unit with a cylinder cavity 17 having two portions 17a and 17b in which a piston 18 is guided by means of a presser rod 19 in a sliding bush 20. The roller journal 4a of the presser roller 4 engages in a bearing 22a. The bearing 22a accommodating the presser roller 4 extends into a chamber between the presser rod 19 and the roller journal IIIa of the lower roller III. The bearing 22a is mounted on the cover 13a. A membrane 16 divides the cylinder cavity 17 in terms of pressure. In order that pressure is generated in the upper portion of the cylinder cavity 17, the latter can be supplied with compressed air p1 by means of a compressed air connection 23. The lower portion of the cylinder cavity 17 is vented by means of a venting bore 24. The upper portion of the cylinder cavity 17 can be vented and the lower portion of the cylinder cavity 17 can be supplied with compressed air in corresponding manner. In operation, after a fibre bundle 5 has been guided over the lower rollers I, II, III, the presser arms 11 are pivoted into the operating position shown in Fig. 3 and fixed in that position by a fastening device (not shown), so that the presser rollers 1, 2, 3, 4 are able to exert pressure. Such a pressing action is produced on the one hand by the fact that the presser rods 19 each rest on the corresponding bearing 22 and on the other hand because an overpressure has been generated in the cavity above the membrane 16. As a result, the presser rod 19 presses with its other end on the bearing 22 in order to create the mentioned pressing action between upper roller 4 and the lower roller (drive roller) III. The presser rod 19 is displaceable in the direction of arrows D, E. The resilient covering surface of the upper roller 4 is associated with a cleaning bar 21, for example a steel rod. According to Fig. 3, the upper roller 4 is associated with the portal-shaped presser arm 11a. (The upper rollers 1 to 3 are associated with a corresponding presser arm 11 - not shown) . The presser arm 11a is in the form of a housing of glass-fibre-reinforced plastics and is produced by injection-moulding. The housing is an integral component which is of unitary construction and comprises the support element 12, the two bodies of the pressure elements 9a1 and 9a2 (pressure cylinders), two intermediate elements 31a and 31b and two holding elements 13a and 13b. During operation, the cleaning bar 21 is located - as shown in Fig. 3 - on the upper roller 4 and acts as a stripper. The cleaning bar 21 has at each of its two ends a fork 27a, 27b, which are, for example, screwed to the cleaning bar 21. The forks 27a, 27b consist of vibration-damping plastics in order to prevent the excitation of vibrations of the cleaning roller 21 on the upper roller. Its arrangement on the piston rods 19a, 19b enables the cleaning bar 21 to be positioned exactly relative to the upper roller 4, because the guidance of the upper roller 4 and the position of the piston rods 19a, 19b is ensured by the presser arm 11. The forks 27a and 27b are located on two resilient elements, e.g. two O-rings 28a and 28b, respectively, which are mounted on the piston rods 19a and 19b, respectively. As a result, the cleaning bar 21 is prevented from falling downwards, for example from the piston rods 19a, 19b. For removal, the cleaning bar 21 needs merely be pulled by the fork over the resilient element from one side. The cleaning bar 21 is inserted by the reverse procedure. The forks 27a, 27b can be supported on the O-rings 28a and 28b, respectively, under gravity. There is advantageously play between the forks 27a, 27b and the presser rods 19a, 19b. According to Fig. 4a, the presser rod 19a has a peripheral turned groove 29 into which, according to Fig. 4b, a resilient O-ring 28a has been snapped. According to Fig. 2, the presser 'rod 19a, out of operation, has been pneumatically relieved of load and lifted away from the upper roller bearing 22a by distance a. As a result, the O-ring 28a is moved in direction S and accordingly, by way of the fork 27a, the cleaning bar 21 is at the same time raised by distance b relative to the upper roller 4. WE CLAIM:- 1. Device on a draw frame for textile slivers, having roller pairs arranged one after the other and a cleaning device, for example a cleaning lip, cleaning rod, for each upper roller, in which the loading device for each upper roller has at least two presser elements, for example pneumatic cylinders, each having a reciprocating component, for example a presser rod, piston rod, and the cleaning device is mounted on the loading device, characterized in that each cleaning device (21) is mounted by its ends on a presser rod (19,19a, 19b) and the presser rod (19, 19a, 19b) has a bearing element (28a, 28b) for the cleaning device (21). 2. Device as claimed in claim 1, wherein the cleaning device is a cleaning bar. 3. Device as claimed in claim 1 or 2, wherein the cleaning device is a cleaning rod. 4. Device as claimed in any one of claims 1 or 3, wherein the cleaning device is a cleaning stripper. 5. Device as claimed in any one of claims 1 to 4, wherein the upper roller has a resilient covering, for example of rubber or the like. 6. Device as claimed in any one of claims 1 to 5, wherein the cleaning device makes contact with the upper roller, or with the resilient covering of the upper roller, from above, substantially under the effect of gravity. 7. Device as claimed any one of claims 1 to 6, wherein the cleaning device makes contact with the upper roller, or with the resilient covering of the upper roller, substantially along a line. 8. Device as claimed any one of,claims 1 to 7, wherein the line extends axially parallel to the upper roller. 9. Device as claimed any one of claims 1 to 8 , wherein the cleaning device is displaceably mounted in two bearing elements. 10. Device as claimed any one of claims 1 to 9, wherein the bearing elements are associated with the cleaning device. 11. Device as claimed any one of claims 1 to 10, wherein the bearing elements are associated with the presser rods. 12. Device as claimed any one of claims 1 to 11, wherein that the bearing elements are supports. 13. Device as claimed any one of claims 1 to 12, wherein the cleaning device is displaceable in the vertical direction. 14. Device as claimed any one of claims 1 to 13, wherein the cleaning device is displaceable in the horizontal direction. . Device as claimed any one of claims 1 to 14, wherein the cleaning device, for example the cleaning bar, has at each of its ends an encompassing element, for example a fork or the like. Device as claimed any one of claims 1 to 15, wherein each fork element engages around a presser rod. , Device as claimed any one of claims 1 to 16, wherein the fork element is attached to the cleaning bar by screws, rivets, adhesives or the like. , Device as claimed any one of claims 1 to 17, wherein the fork element is formed on the cleaning bar by non-cutting shaping, for example forging, pressing or the like. , Device as claimed any one of claims 1 to 18, wherein the attached fork element consists wholly or partially of a vibration- damping material, for example plastics material. , Device as claimed any one of claims 1 to 19, wherein the presser rod has a support for the cleaning bar. 21. Device as claimed any one of claims 1 to 20, wherein the support projects beyond the diameter of the presser rod. 22. Device as claimed any one of claims 1 to 21, wherein the support consists of a resilient material, for example rubber. 23. Device as claimed any one of claims 1 to 22, wherein the support is a rubber ring. 24. Device as claimed any one of claims 1 to 23, wherein the rubber ring is partly engaged in a recess in the presser rod, for example a peripheral groove. 25. Device as claimed any one of claims 1 to 24, wherein the rubber ring rests on a turned groove in the presser rod. 26. Device as claimed any one of claims 1 to 25, wherein the presser rod has as bearing element a recess in which an end region of the cleaning bar engages. 27. Device as claimed any one of claims 1 to 26, wherein the recess is continuous. 28. Device as claimed any one of claims 1 to 27, wherein there is play between the internal surfaces of the fork element and the outer surface of the presser rod. 29. Device as claimed any one of claims 1 to 28, wherein there is play between the outer surfaces of the end regions of the cleaning bar and the inner surface of the recess. Device on a draw frame for textile slivers, having roller pairs arranged one after the other and a cleaning device, for example a cleaning lip, cleaning rod, for each upper roller, in which the loading device for each upper roller has at least two presser elements, for example pneumatic cylinders, each having a reciprocating component, for example a presser rod, piston rod, and the cleaning device is mounted on the loading device, characterized in that each cleaning device (21) is mounted by its ends on a presser rod (19, 19a, 19b) and the presser rod (19, 19a, 19b) has a bearing element (28a, 28b) for the cleaning device (21).

Documents:

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

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

546-KOL-2004-FORM 27.pdf

546-kol-2004-granted-abstract.pdf

546-kol-2004-granted-claims.pdf

546-kol-2004-granted-correspondence.pdf

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

546-kol-2004-granted-drawings.pdf

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

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

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

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

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

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

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

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

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

546-kol-2004-granted-specification.pdf

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