Title of Invention

APPARATUS ON A DRAW FRAME FOR TEXTILE FIBRE SLIVERS WITH WEUGHTING OF THE TOP ROLLERS OF THE DRAWING SYSTEM

Abstract

The invention relates to an apparatus on a draw frame for textile fiber slivers, having weighted top rollers for the drawing systems (5), the apparatus comprising, successively arranged pairs of rollers (4/III, 3/II; 3/II, I; 2/I), each pair of rollers having a bottom roller (I-II), and a top roller, (1to 4); a plurality of pressure arms (11a - 11d), each pressure arm having weighted pressure elements (9, 91-94; 9a1, 9a2; 9b1, 9b2; 9c1, 9c2; 9d1, 9d2; 13a - 13d) for pressing one of the top rollers against its corresponding bottom roller during operation, each pressure arm being positioned so as to one of rotate and pivot together with its pressure elements around one of a rotating bearing and a pivot bearing (10); and a plurality of supporting elements (12; 12a to 12d) each supporting element being essentially empty and pneumatically connecting the pressure elements associated with one of the top roller; wherein the pressure elements are removable.

Full Text

Apparatus on a draw frame for textile fibre slivers with weighting of the top rollers of the drawing system. The invention relates to an apparatus on a draw frame for textile fibre slivers with weighting of the top rollers of the drawing system of successively arranged pairs of rollers comprising a bottom and a top roller, in which, during operation, the top rollers are pressed against the bottom rollers by weighted pressure elements in pressure arms, wherein two pressure elements with a common holding element are associated with each top roller and the weighting device is removable. In a known apparatus, a pressure arm comprising two lateral supports with a common crosshead is associated with each top roller. A pneumatic pressure- applying element is mounted on each lateral support. The pressure arm is rotatable about a pivot bearing, which is provided at the lower end of one lateral support and is secured to the machine frame by way a bearer. A pneumatic compressed air line is located inside the crosshead and the lateral supports. This invention is based on the problem of further improving the known apparatus. The invention provides apparatus on a draw frame for textile fibre slivers with weighting of the top rollers of the drawing system of successively arranged pairs of rollers comprising a bottom and a top roller, in which, during operation, the top rollers are pressed against the bottom rollers by weighted pressure elements in pressure arms, wherein two pressure elements with a common holding element are associated with each top roller and the weighting device is removable, characterised in that at each pressure arm (lla to l1d), a respective pressure element (9; 91 to 94; 9a1, 9a2; 9b1, 9b2; 9c1, 9c2; 9d1, 9d2; 13a to 13d) is rotatably or pivotally mounted at a centre of rotation (10) or a pivot bearing and the pressure elements (9; 91 to 94; 9a1, 9a2; 9bl, 9b2; 9cl, 9c2; 9d1, 9d2; 13a to 13d) are connected with one another by a supporting element (12; 12a to 12d). The fact that the pressure elements and the pressure channel are used as supporting structural elements enables the apparatus according to the invention to be of compact construction. In particular, it savings in space can be made both in the direction of the flow of the fibre material and in headroom. The pressure element advantageously comprises a reciprocating part, for example, a ram. The ram preferably has a circular cross-section. The pressure elements are advantageously pneumatic cylinders. The pneumatic cylinder preferably has a rectangular cross- section. The width of the pneumatic cylinder is advantageously the same as or smaller than the width or the diameter of the top roller. The pneumatic cylinder is preferably a supporting element of the pressure arm. The pneumatic cylinder is advantageously mounted at the centre of rotation or pivot bearing. The centre of rotation or pivot bearing is advantageously mounted in the region of the lower end of the pneumatic cylinder facing the top rollers. The pneumatic cylinder preferably has a covering. The centre of rotation and pivot bearing is advantageously arranged on the lower covering of a pneumatic cylinder. The supporting element is preferably mounted in the region of the upper end of the pneumatic cylinders remote from the top rollers. The supporting element preferably forms the upper covering of the pneumatic cylinders of a pressure arm. The supporting element advantageously forms a bridge between the pneumatic cylinders of a pressure arm. The supporting element advantageously forms a crosshead for the two pneumatic cylinders. The supporting element is advantageously hollow inside. The supporting element preferably forms a compressed air channel. The pneumatic cylinders are advantageously connected to the pressure channel. The pneumatic cylinders and the supporting element preferably form a portal-form pressure arm. The supporting element advantageously accommodates electrical leads. The pressure arm is preferably arranged in the same plane as the top roller. The longitudinal axis of the supporting element is preferably arranged parallel to the longitudinal axes of the top roller. The pneumatic cylinders are advantageously arranged perpendicular to the top roller. The pneumatic cylinders are preferably arranged perpendicular to the supporting element. The supporting element is advantageously an extruded section, for example, of aluminium. The lower covering of a pneumatic cylinder is preferably rotatably mounted at a pivot bearing. A locking device is advantageously associated with the respective other pneumatic cylinder. A locking device is preferably associated with the lower covering of the respective other pneumatic cylinder. At each pressure arm advantageously a pneumatic cylinder or its lower covering is articulated at a pivot bearing. At each pressure arm a locking device is preferably associated with a pneumatic cylinder or its lower covering. The invention is explained in detail hereinafter with reference to exemplary embodiments illustrated in the drawings, in which: Fig. 1 is a schematic side view of the drawing system of a draw frame with the apparatus according to the invention; Fig. 2 shows part of Fig. 1 in the section corresponding to K-K (Fig. 1) witn a pneumatic top roller weighting device; Fig.3 is a perspective view of the drawing system with four portal-form pressure arms, which are associated with the top rollers of the drawing system; Fig.4 shows the front view of the apparatus according to the invention, in which a portal—form pressure arm and top roller have been swung up; Fig.5 shows a pneumatic cylinder, the lower covering of which is articulated at a pivot beaing; Fig.5a shows a cross—section through a pneumatic cylinder according to Fig.S, and Fig.6 is a schematic longitudinal section through two pneumatic cylinders with supporting element, which is in the form of a compressed air channel. Fig.7 Front view of a pressure arm with integral housing. Fig.7a The housing as per Figure 7 in perspective,partly broken up, with cover. Fig.8a,8b A spring-loaded pressure push-button with double angle lever which can be rotated and Fig.9a,9b The pressure arm with (Figure 9a) and without (Figure 9b) top roller. With reference to Fig.l, a drawing system S of a draw frame, for example, the Trutzcheler HSR draw frame is provided. The drawing system S is designed as a 4-over~3 drawing system, that is, it comprises three bottom rollers I, II, III (I being the bottom output roller, II the middle bottom roller, III the bottom intake roller) and four top rollers 1, 2, 3, 4. Drafting of the composite sliver 5 from a plurality of fibre slivers takes place in the drawing system S. The draft is made up from the preliminary draft and the main draft, and 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 bottom output roller I is driven by the main motor (not shown) and hence determines the rate of delivery. The bottom intake and middle bottom rollers III and II respectively are driven by a variable speed motor (not shown). The top rollers 1 to 4 are pressed against the bottom rollers I, II, III by pressure elements 91 to 94 (weighting device) in pressure arms lla to l1d pivotable about pivot bearings (see Figs 3 and 4), and are hence driven by way of frictional engagement. The direction of rotation of the rollers I, II, II; 1, 2, 3, 4 is indicated by curved arrows. The composite fibre sliver 5, which consists of a plurality of fibre slivers, runs in direction A. The bottom rollers I, II, III are mounted in bearers 14 (see Fig. 3) which are arranged on the machine frame 15. Referring to Fig. 2, the pneumatic cylinder 9 comprises an upper cover (supporting element 12) and a lower cover 13a. The pneumatic cylinder 9 forms a cylinder unit having a cylinder cavity 17 comprising two parts 17a and 17b, in which a piston 18 is guided by means of a ram 19 in a sliding bushing 20. The roller journal 4a of the pressure roller 4 passes right through an opening in a holding plate 27 and engages in a bearing 22a. The bearing 22a receiving the pressure roller 4 extends in a space between the ram 19 and the roller journal IIIa of the bottom roller III. The bearing 22a is mounted on the cover 13a1. A diaphragm 16 divides the cylinder cavity 17 into pressure regions. In order to generate pressure in the upper part of the cylinder cavity 17, compressed air p1 can be admitted to this space by means of a compressed air connection 23. Air is evacuated from the lower part of the cylinder cavity 17 through a vent bore 24. Analogously, air can be evacuated from the upper part of the cylinder cavity 17 and compressed air can be admitted to the lower part of the cylinder cavity 17. In operation, after a fibre sliver 5 has been guided over the bottom rollers I, II, III, the pressure arms 11 are pivoted into the working position shown in Fig. 1 and fixed in this position by a fixing device (not shown), so that the pressure rollers I, II, III are able to exert pressure. Application of pressure occurs on the one hand as a consequence of each of the rams 19 being located on the corresponding bearing 22, and on the other hand in that an overpressure is generated in the void above the diaphragm 16. The ram 19 therefore presses with its other end on the bearing 22, in order to generate the said clamping between the top roller 4 and the bottom roller (drive roller III). The ram 19 is displaceable in the direction of the arrows D, E. Referring to Fig. 3, each top roller 1 to 4 has associated with it a respective portal-form pressure arm lla, l1b, l1c, l1d, which, seen in plan view, is oriented parallel to the longitudinal axis of the respective top roller 1 to 4. The pressure arms lla to l1d are shown in the closed position. The bottom rollers I to III are mounted in bearers 14a, 14b and 14c respectively, which are displaceably mounted on the machine frame 15. At the same time, two pressure elements 9 are associated with each top roller 1 to 4 and are connected with one another by a common supporting element 12. According to Fig. 4, the portal-form pressure arm lla, which consists of two lateral pneumatic cylinders 9a1 and 9a2 (pressure elements), a common supporting element 12a and two cover elements 13a1 and 13a2, is associated with the top roller 4. The cover elements 13a1 and 13a2 are mounted at the lower ends of the pneumatic cylinders 9a1 and 9a2 and form the lower cover thereof. The supporting element 12a is mounted at the upper ends of the pneumatic cylinders 9a1 and 9a2 and forms their upper cover. Together with the top roller 4, the pressure arm lla is upwardly pivoted about a pivot bearing 10 (see Fig. 5). The cover elements 13a1 and 13a2 are, seen in side view, of angular (right- angled) construction, one arm of the angle covering a respective pneumatic cylinder 9a1, 9a2. The other angle arm of the cover element 13a1 is rotatably mounted in the region of its free end at the pivot bearing 10. The other angle arm of the cover element 13a2 has a locking device in the region of its free end, the locking device comprising an aperture 26, through which a sliding locking rod (not shown) mounted on the machine frame 15 engages. The pressure arm lla is shown in the opened position. Referring to Fig. 5, the lower cover element 13 of the pneumatic cylinder 9 is articulated on the bearer 14 by way of a pivot bearing 10 so as to rotate in the direction of the arrows B and C. Referring to Fig. 6, the supporting element 12a consists of an extruded section, for example of aluminium, which is hollow inside and the end faces of which are closed. In the end face regions there are two openings 12', 12' in a lateral wall. This creates a channel 12'', through which compressed air p is able to pass. One connection 23 for the admission of compressed air p1 is therefore sufficient, part of the compressed air flowing into the pneumatic cylinder 9a1 and the remainder flowing via the channel 12'' of the supporting member 12a into the pneumatic cylinder 9a2. The pneumatic cylinders 9a1 and 9a2 have a respective connection 24 and 25 for discharge of the compressed air p and p respectively. 2 3 As shown in Fig.l, a central compressed air line 28 is provided, to which four branch lines 28a to 28d leading to the pneumatic cylinders 9 to 9 are connected. The compressed air 1 4 line 28 is connected to a compressed air source 29. The invention has been explained with reference to an example in which a pivot bearing and a lacking device are associated with each pressure arm. The invention also includes a construction in which two combined pivot bearings and locking devices are associated with a pressure arm. The apparatus according to the invention has been illustrated by way of the example of a draw frame with pneumatic weighting of the top rollers. The invention also includes a draw frame in which the top rollers are loaded mechanically, for example, by springs. As per Fig.7,7a the gantry shaped pressure arm lla is allocated to the top roller 4. (A corresponding pressure arm 11 — not represented - is allocated to the top rollers 2 to 4.) The pressure arm lla is built up as housing 30 made out of fibre glass reinforced plastic and is manufactured through pressure die casting process. The housing 30 is an integral component which is built up iniformly and the carrier item 12a covers both the bodies of the pressure items 9a and 9a (pressure cylinder),two 1 2 intermediate items 31a and 31b and two rotaining items 32a and 32b. The carrier item 12a is built up as one sided opended up channel with some what U-shaped cross-section,in whose inside space pneumatic pipe line 34 and electric lines 35 are assembled. The opended up side of the channel 34 can be blanked off through a removable cover which is made out of fibre glass reinforced plastic, which shows somewhat U—shaped cross section and is elastic in such a way that it is fastened through press fit to the channel 33. The housing 30 is built up in preference as a single piece. The integral housing 30, which combines all the essential items of function for the retaining and loading of respective top rollers 1 to 4, may be manufactured in this way price effectively. At the same time in a simple way the entire pressure arm lla to l1d may be rotated around the pivot bearing 10 and may be unlocked through the inter lacking device 26. Corresponding to Figure 8a, 8b, a pressure push-button 37 is assembled a the intermediate item 31b, which is loaded through a compression spring 38. The pressure push button may be shifted in the direction of the arrow F,G. Furthermore, a double lever 39 is brought up a the intermediate item Sib which may be rotated around a pivot bearing 40 in the direction of H, I. As per Figure 8a, the right angled projecting part of the angle arm 39b engages and holds the trunion 4ib of the bearing 22b of the top roller 4. If the pressure arm 37 as per Figure 8b is pressed in direction F against the angular arm 39a of the angle lever 39, then the angular arm 39 rotates in the direction of arrow H around the pivot bearing 40, so that the angular arm 39b releases the trunion 41b. In this way, as it is represented in Figure 9b, the top roller 4 with the bearings 22a, 22b may be removed fully out of the pressure arm lla. In Figure 9a the pressure arm lla with the top roller 4 is represented in swivelled position. At the double lever 39 two recesses 43a 43b are present, in which depending on the position equivalent engages. WE CLAIM 1. An apparatus on a draw frame for textile fiber slivers, having weighted top rollers for the drawing systems (5), the apparatus comprising: successively arranged pairs of rollers (4/III, 3/II; 3/II, I; 2/I), each pair of rollers having a bottom roller (I-II), and a top roller, (1to 4); a plurality of pressure arms (lla - 11d), each pressure arm having weighted pressure elements (9, 91-94; 9a1, 9a2; 9b1, 9b2; 9c1, 9c2; 9d1, 9d2; 13a - 13d) for pressing one of the top rollers against its corresponding bottom roller during operation, each pressure arm being positioned so as to one of rotate and pivot together with its pressure elements around one of a rotating bearing and a pivot bearing (10); and a plurality of supporting elements (12; 12a to 12d), each supporting element being essentially empty and pneumatically connecting the pressure elements associated with one of the top roller, wherein the pressure elements are removable. 2. An apparatus as claimed in claim 1, wherein each pressure element comprises a reciprocating member. 3. An apparatus as claimed in 1, wherein each pressure element is a pneumatic cylinder (9) of rectangular cross-section. An apparatus as claimed in claim 3, wherein a pressure device comprises one of the pressure arms, two of the pneumatic cylinders and of the supporting elements. An apparatus as claimed in claim 4, wherein the pressure devjce is one of rotatable and pivotable about one of a center of rotation and a pivot bearing (10) associated with a first said pressure element and the apparatus further comprises a locking device (20) in a vicinity of a second said pressure element for locking the pressure device in position on said top roller. An apparatus as claimed in claim 5, wherein said second pressure element has a lower cover element, said locking device being provided on said lower cover element. An apparatus as claimed in claim 1, wherein one of the pressure elements is associated with a first end region of each of the top rollers and another of the pressure elements is associated with a second, opposed, end region of each of the top rollers. An apparatus as claimed in claim 1, wherein said pressure elements structurally support said supporting element. An apparatus as claimed in claim 1, wherein a first pressure element of the pressure elements is mounted at the pivot bearing. An apparatus as claimed in claim 9, wherein the pivot bearing is located in a lower region of the first pressure element. An apparatus as claimed in claim 9, wherein the pivot bearing is located in a lower cover element (13; 13a1; 13a2; 13b1, 13b2; 13c1, 13C2; of the first pressure element. An apparatus as claimed in claim 1, wherein the supporting element is mounted on said pressure elements at or in the vicinity of upper ends of said pressure elements. An apparatus as claimed in claim 1, wherein the supporting element is hollow. An apparatus as claimed in claim 1, wherein the supporting element forms a compressed air channel (b) and the pressure elements are pneumatic cylinders which are in communication with said compressed air channel. An apparatus as claimed in claim 1, wherein the pressure elements are arranged perpendicular to the supporting element. An apparatus as claimed in claim 1, wherein the pressure elements are arranged perpendicular to the top roller. An apparatus as claimed inc claim 1, comprising portal-shaped pressure arm (11a) formed from said pressure elements and said supporting element. 18. An apparatus as claimed in claim 1, wherein the pressure element and the top roller are in a common plane. 19.The apparatus as claimed in claim 1, comprising a locking and unlocking device for the top roller. 20.The apparatus as claimed in claim 9, wherein the locking and unlocking device is a pressure tracer (37). 21.The apparatus as claimed in claim 20, wherein the pressure tracer is weighted with a spring element (38). 22.The apparatus as claimed in claim 21, wherein the spring -weighted pressure tracer cooperates with an angle lever (39) that is pivotable around a bearing. 23.The apparatus as claimed in claim 22, wherein the angle lever (39) is a double angle lever. 24.The apparatus as claimed in claim 23, wherein the pressure tracer acts upon an angle arm of the double angle lever. 25.The pressure as claimed in claim 24, wherein the top roller acts jointly with other angle arms of the double angle lever (39). 26.The apparatus as claimed in claim 23, wherein two recesses (43a, 43b) are provided on the double lever, and an elastically loaded detent engages in one of the recesses depending on a position of double lever. 27.The apparatus as claimed in claim 20, wherein the pressure tracer is manually activatable. 28.The apparatus as claimed in claim 20, comprising a housing (30) for the pressure arm, the housing having an intermediate element, (21a, 31b), wherein the pressure tracer is arranged on the intermediate element of the housing. 29. The apparatus as claimed in claim 1, wherein one pressure element is attached to the one of a rotating bearing (40) and a pivot bearing (10) so as to one of rotate and pivot. 30. A drawing system (5) for a draw frame, comprising: successively arranged pairs of rollers, each pair having a bottom roller and a top roller; and a weighting device (9) for applying pressure to the top roller of a said pair of rollers, the weighting device having a pair of spaced pressure elements and a support element extending between said pressure elements, said pressure elements comprising structural members of said weighting device, wherein said support element is essentially empty and pneumatically connects said pressure elements. 31. A drawing system as claimed in claim 30, wherein the weighting device is pivotably mounted in the vicinity of a first pressure elements of said pair of pressure elements. 32.A drawing system as claimed in claim 31, wherein the top roller to which pressure is applied is connected to the weighting device and pivotable therewith. 33. An apparatus on a draw frame for textile fiber slivers, having weighted top rollers for the drawing system, the apparatus comprising: successively arranged pairs of rollers, each pair of rollers having a bottom roller and a top roller, a plurality of pressure arms, each pressure arm having weighted pressure elements for pressing one of the top rollers against its corresponding bottom roller during operation, each pressure arm being positioned so as to one of rotate and pivot together with its pressure elements around one of a rotating bearing and a pivot bearing, wherein the pressure elements are removable; a plurality of supporting elements, each supporting element connecting the pressure elements associated with one of the top rollers, wherein the support element comprises a channel that is open on one side and is closable with a removable lid; and a housing for the pressure arm. 34.The apparatus as claimed in claim 33, wherein the housing comprises plastic. 35.The apparatus as claimed in claim 34, wherein the plastic comprises a fiber-reinforced plastic. 36.The apparatus as claimed in claim 33, wherein the housing is an injection- molded housing. 37.The apparatus as claimed in claim 33, wherein the hosing is an integral component. 38.The apparatus as claimed in claim 33, wherein the housing comprises the supporting element. 39.The apparatus as claimed in claim 33, comprising one of electrical lines (34) and pneumatic lines (35) arranged in the channel. 40.The apparatus as claimed in claim 33, wherein the housing comprises the pressure elements. 41.The apparatus as claimed in claim 33, wherein the housing comprises two holding elements. 42.The apparatus as claimed in claim 41, wherein respectively one holding element is assigned to an outside of the pressure element. 43.The apparatus as claimed in claim 41, wherein one of the holding elements is attached to the one of a rotating bearing and a pivot bearing, such that it can one of rotate and pivot. 44.The apparatus as claimed in claim 43, wherein the one of the holding elements can be detached from the one of a rotating bearing and a pivot bearing. 45.The apparatus as claimed in claim 43, wherein each pressure element is attached via at least one intermediate element to the one of a rotating bearing and a pivot bearing. 46.The apparatus as claimed in clam 41, comprising a locking device, wherein the one of the holding elements can be detached from the locking device. 47.The apparatus as claimed in claim 46, wherein each pressure element is fastened detachably with at least one intermediate element to the locking device. DATED THIS 03th DAY OF JUNE 2003 The invention relates to an apparatus on a draw frame for textile fiber slivers, having weighted top rollers for the drawing systems (5), the apparatus comprising, successively arranged pairs of rollers (4/III, 3/II; 3/II, I; 2/I), each pair of rollers having a bottom roller (I-II), and a top roller, (1to 4); a plurality of pressure arms (11a - 11d), each pressure arm having weighted pressure elements (9, 91-94; 9a1, 9a2; 9b1, 9b2; 9c1, 9c2; 9d1, 9d2; 13a - 13d) for pressing one of the top rollers against its corresponding bottom roller during operation, each pressure arm being positioned so as to one of rotate and pivot together with its pressure elements around one of a rotating bearing and a pivot bearing (10); and a plurality of supporting elements (12; 12a to 12d) each supporting element being essentially empty and pneumatically connecting the pressure elements associated with one of the top roller; wherein the pressure elements are removable.

Documents:

309-KOL-2003-(07-12-2011)-FORM-27.pdf

309-KOL-2003-(13-08-2012)-FORM-27.pdf

309-KOL-2003-FORM 27.pdf

309-kol-2003-granted-abstract.pdf

309-kol-2003-granted-claims.pdf

309-kol-2003-granted-correspondence.pdf

309-kol-2003-granted-description (complete).pdf

309-kol-2003-granted-drawings.pdf

309-kol-2003-granted-examination report.pdf

309-kol-2003-granted-form 1.pdf

309-kol-2003-granted-form 13.pdf

309-kol-2003-granted-form 18.pdf

309-kol-2003-granted-form 2.pdf

309-kol-2003-granted-form 26.pdf

309-kol-2003-granted-form 3.pdf

309-kol-2003-granted-form 5.pdf

309-kol-2003-granted-priority document.pdf

309-kol-2003-granted-reply to examination report.pdf

309-kol-2003-granted-specification.pdf

309-kol-2003-granted-translated copy of priority document.pdf