Title of Invention

SPINNING FRAME WITH SUCTION PIPE AT A CONDENSING DEVICE

Abstract

In a spinning frame with a drafting unit (8) and a condensing device (10) a suction pipe (22) is arranged at the outlet side of the drafting unit within a wedge-shaped space between the circumferential surface of the condensing element (12) and a plane within which several threads (20) lay next to each other. Laterally, offset in relation to the pipe centre in axial direction of the condensing element (12) or the clamping roller (16) respectively, oval openings (28) are directed towards threads (20), in particular two openings (26,28) towards two threads (20). The suction pipe leads to a central suction device within the spinning frame.

Full Text

The invention relates to a spinning frame with a suction pipe at a condensing device. Co-pending Indian Patent Application No.974/MAS/2000 dated 15 November 2000 filed by the applicant discloses a spinning frame with a condensing device, which is characterised in that within the zone of the roving which is being condensed, a roller 16 with a surface hardness of less than 60°. Shore is being pressed against a condensing element 35. The Spinning frame with the condensing device is combined with a drafting unit; at the transition from the drafting unit to the condensing element 35 an upper outlet roller 16 is pressed against a mobile condensing element 35 whereat the condensing element 35 is designed as a basically rigid element; the upper outlet roller 16 is furnished with a layer of material which at least partly comprises a hardness of distinctly less than 60°. The upper outlet roller 16 is provided with an abrasion-resistant outer layer. Co-pending Indian Patent Application No.901/MAS/2000 dated 24 October 2000 filed by the applicant discloses a suction installation for a spinning frame with a primary filter 33 through which most of the air which is being suctioned from the spinning frame can be led to a suction space 42 and further to a vacuum source 43; on the outlet side of the primary filter at least one secondary filter 21, 41 is arranged within a secondary filter space 42a from which the filtered air can be led to a vacuum source 43 via a suction line 3, whereby the flowing direction at the secondary filter 21, 41 can be reversed in such a way, that during a counter flow, waste which has accumulated on the secondary filter 21, 41 can be removed from the secondary filter space 42a, In the Suction installation waste from a primary filter space within the primary filter 33 can be led into the secondary filter space 42a. Waste from the primary filter 33 and from the secondary filter space 42a can be led into a collector 62 by opening a flap 51. Co-pending Indian Patent Application No.770/MAS/2000 dated 15 September 2000 filed by the applicant discloses a spinning frame with condensing device, comprising a condensing element 12 and a suction insert 14, whereby the suction insert 14 is positioned between a shaft 13 and the condensing element 12 which is being mounted on the shaft 13; the suction insert 14 consists of at least one suction housing 142, a cover 146 and a spring element 144. The suction insert 14 is centred on the shaft 13 and is centred at the inside of a rotation-symmetric condensing element 12. Co-pending Indian Patent Application No.527/MAS/2000 dated 7 July 2000 filed by the applicant discloses a spinning frame comprising a drafting unit 12 for drafting a sliver with an output roller 44 and a first counter roller 42 being pressed against it and a condensing device 45 arranged after the drafting unit; a drive 46 is provided which is connected with a condensing element 62, 64 of the condensing device 45 and the drive is connected with the output roller 44 of the actual drafting unit 12, and a drive wheel 46 of the drive is fitted between the lower output roller 44 of the drafting unit 12 and the condensing element 62, 64; the lower output rollers 44 and a drive wheel 46 are arranged at the same side of the sliver and below said sliver. A rotating condensing element 62 on one hand stays in contact with a drive 46 and on the other hand with a counter roller 52. A flexible condensing element 64 is led over an element 62 which is in guiding connection with the element and which may be supported rotatably or non-rotatably. Co-pending Indian Patent Application No.386/MAS/1999 dated 5 April 1999 filed by the applicant discloses a spinning frame with a compacting device 26 for a fibre band 10, 10a, 10b in or between a drafting unit and a twisting and winding device, with a perforated compacting element 262, which within its inner space is being furnished with a suction element 200 with a suction device 201, and with an umbrella shaped cover 30 being arranged at its outside within the effective zone of the suction element 200, the height h of the gap between the umbrella 30 and the compacung element zoz amounts to between 0.5 and 3.5 mm, 1.0 to 2.0 mm in particular and preferably 1.5 mm. The umbrella 30 is arranged in a offset position by the measurement a Co-pending Indian Patent Application No.l46/MAS/1999 dated 4 February 1999 filed by the applicant discloses a spinning frame with a material presenter 7, a drafting unit 1, a traversing device 9, a compacting device 3 and a spinning station 5, whereat a fibre band 71 is being led over a compacting element 31 of the compacting device 3, which device comprises a compacting zone 311,311' provided with holes or suction openings 313, the inside of said zone being connected to a suction device 4; at a width SB of the compacting zone 311 of 1 to 3 mm, the traversing stroke CH of the traversing device 9, in other words, the shifting path of the fibre band 71 on the compacting device 31, is 2 to 4-fold of the SB. The traversing device 9 is of such a design that the fibre band offset V, that is the shift of a fibre band 71 at right angle to the compacting zone 311, is of up to twice the value of SB; the width SB of the compacting zone 311 is 1 to 3 mm, whereat the lower value for fine yarn is Ne 10. The disclosure of these co-pending applications are incorporated herein by cross-reference. The invention is being applied in a spinning frame as is for instance being described in the German patent application DE 44 26 249.3. The content of this application is in so far considered a part of the present disclosure as it promotes its understanding. Spinning frames with condensing devices allow the production of high quality yams. It is therefore necessary to optimally lay out all elements being involved in the spinning process. Amongst other facts the task is given to provide a suction pipe which on one hand removes fibre fly without a tendency of contamination and on the other hand to safely catch the free end of the sliver during a thread break. This task is being solved by a suction pipe with the characteristics as described herein. Accordingly the present invention provides a spinning frame with a suction pipe a spinning frame with a suction pipe, at a condensing device, whereat the condensing device is being arranged at the outlet side of a drafting unit and whereat the suction pipe is being arranged at the downstream side close to a clamping gap between a clamping roller and a condensing element and at a thread, which is being led off the condensing device, characterised in that the suction pipe at its end, which is directed towards the clamping gap and which is being arranged between the outer surface of a roller and a plane within which several threads lay next to each other, is being provided with at least one opening whereat said opening as seen in relation to the axis of the suction pipe is being displaced in axial direction of the roller or the clamping roller respectively, and whereat the opening is directed to the thread which is being guided at a close distance in relation to the suction pipe. The invention is being described in detail by way of examples of the accompanying drawing, wherein show: Figure 1 schematically the position of the suction pipe in relation to the condensing device of the spinning frame. Figure 2 a side view of the suction pipe basically at right angle towards the running direction of the threads below the condensing device, seen from the left side in figure 1. Figure 3 a perspective view onto the pipe end with the threads besides it, whereat the rib has been left out. Figure 4 a longitudinal cross section through the suction pipe, with a rib arranged on its upper side in the right hand part of the figure and a side view of the suction pipe as seen from the right side, in the left hand part of the figure and Figure 5 a bottom view B onto the pipe according to arrow B in figure 4 and a cross section C-C according to the section line in view B. From a not further shown supply means a sliver or roving 18 is being led into a drafting unit 8 of which only one pair of rollers is being shown. An outlet roller 14 together with a condensing element 12, which is being provided with a rotation axis, is to be considered as a part of the drafting unit 8, on the other hand the latter belongs to the condensing device 10, whereat the condensing element 12 is preferably designed as a perforated fixed drum being suctioned from the inside. After leaving the drafting zone in the drafting unit 8, between the outlet roller 14 and the condensing element 12, the roving 18 partially runs over the outer circumferential surface of the condensing element 12, up to about the clamping gap between a clamping roller 16 and the condensing element 12. Within the clamping gap or slightly afterwards the roving 18 or the twisting thread 20 respectively, is being drawn off from the condensing element and is wound in a twisting and winding unit onto a sleeve. According to the invention the suction pipe 22 is preferably an open-ended tapered pipe narrowing towards the clamping gap between the clamping roller 16 and the condensing element 12, and which is furnished with a rib 24 being positioned symmetrically at a right angle towards the rotational axis. Preferably and according to figure 2 two threads 20 are led next to each other on a condensing element 12, whereat the suction pipe 22 is being positioned between these two threads. As can be seen from figure 1, the suction pipe 22 is being positioned between the outer circumferential surface of the condensing element 12 and a plane within which several threads 20 are being led next to each other in the axial direction of the condensing element 12. The actual suction opening 28 of the suction pipe 22 is positioned laterally offset in axial direction of the condensing element 12 or the clamping roller 16 respectively, besides the thread 20 but as close as possible to it, since during a thread break the fibre material has to be removed towards the inside of the suction pipe 22. With double guidance of the threads 20 as indicated in figure 2 there is one suction opening 28 and 26 respectively each being located at the outer side of the suction pipe 22 next to the thread 20, whose openings are inclined at an angle of 40° - 70°, preferably 50°, in relation to a symmetrical plane 30 laid through the suction pipe and being at a right angle to the axis of the condensing element 12. Furthermore, as is shown in figure 2, the suction opening 26 or 28 respectively, is directed away from the condensing element 12 i.e. in the drawn plane slantedly downwards against the thread 20. Between two openings 26 and 28 there is a further slot-shaped opening 27 directed transverse to the rib 24 which is considerably smaller than the openings 26 or 28 respectively. The openings 26 and 28 are basically oval while the connecting opening 27 basically is of rectangular shape. The openings 26, 27, 28 thus resemble the form of eye-glasses whereat said 'glasses' are directed towards the portions of the threads 20 next to them and whereat past the symmetrical plane 30, which is at an angle to the axis of the condensing element 12 or the clamping roller 16 respectively, said 'glasses' are being connected by the slot-shaped opening 27. Together with a rib 24 being attached on the right side or below respectively, and which lays positioned in the symmetrical plane 30, the connecting opening serves the purpose that possible inter-connected fibres from one thread 20 to another, according to figure 2, at first are being caught on the rounded end part of the rib 24 and then are being led downwards into the connecting opening 27. The rib 27 which ends above the suction opening 28 or 26 respectively, i.e. closer to the clamping gap between the clamping roller 16 and the condensing element 20, further has the effect of a separator between the threads 20. As mentioned above the suction pipe 22 can be provided as a pipe with only one opening for a single-thread embodiment of the condensing device 10, whereat said opening on the pipe 22 is being positioned within the wedge-shaped space between the condensing element 12 and the thread 20, in axial direction of the condensing element 12, offset on the outer wall and at the same time at the end of the tapered pipe 22. In this case the symmetrical plane 30 would be a side wall of the suction pipe 22. As mentioned the pipe is to be arranged as close as possible at the clamping gap between the clamping roller 16 and the condensing element 12, whereat a distance of between 15 and 25, preferably 20 mm is to be maintained between the pipe end and the clamping gap. Due to the arrangement of the suction pipe 22 as close as possible to the outer surface of the condensing element the perforations of said condensing element are also being suctioned effectively and thus kept free of contamination. It is understood that a plurality of suction pipes 22 within a spinning frame is being connected to one suction installation. Figure 3 shows the suction pipe end 22 perspectively, in viewing direction slantedly from the top downward according to the arrow in figure 1, however without rib 24. The lateral and slantedly arranged openings point downwards so that the incoming air stream contacts the threads 20 as is indicated by the arrows. Figure 4 is a longitudinal cross section and side view onto the tapered end of the suction pipe 22. While the free longitudinal edge of the rib 24 basically runs parallel to the axis of the pipe, the head edge of the rib includes with the pipe axis or the free edge respectively, an angle of approximately 50°, whereat said angle may vary between 40' and 60°. Figure 5 shows in the lower half, a bottom view B onto the suction pipe 22 being shown in longitudinal cross section in the figure and a section according to the line C-C through the pipe head part, whereat said section is basically laid transverse to the longitudinal extension of a suction opening 28. The suction openings 26 and 28 are basically of elliptical shape, whereat the larger symmetrical axis of the ellipse together with the symmetrical plane 30 includes an angle of 40° to 60°, in particular 50° and whereat the smaller axis of the ellipse in the drawing plane of the section C-C together with the normal on the pipe axis includes an angle of 0° to 50°, 20° in particular. The suction pipe according to the invention can also with advantage be applied in a spinning frame without a condensing device, where, instead of being arranged besides the condensing element said suction pipe is being arranged next to a roller (12) with similar function, the so called front roller or outlet roller of the drafting unit. WE CLAIM 1. Spinning frame with a suction pipe (22), at a condensing device (10), whereat the condensing device (10) is being arranged at the outlet side of a drafting unit (8) and whereat the suction pipe is being arranged at the downstream side close to a clamping gap between a clamping roller (16) and a condensing element (12) and at a thread (20), which is being led off the condensing device (10), characterised in that the suction pipe at its end, which is directed towards the clamping gap and which is being arranged between the outer surface of a roller (12) and a plane within which several threads (20) lay next to each other, is being provided with at least one opening (26,28) whereat said opening as seen in relation to the axis of the suction pipe (22) is being displaced in axial direction of the roller (12) or the clamping roller (16) respectively, and whereat the opening is directed to the thread (20) which is being guided at a close distance in relation to the suction pipe (22). 2. Spinning frame as claimed in claim 1, wherein on both sides of a symmetrical plane (30) of the suction pipe (22), which plane is at a right angle in relation to the rotation axis of the condensing element (12), one suction opening each (26,28) is being arranged at the end of the suction pipe (22). 3. Spinning frame as claimed in claim 2, wherein at the end of the suction pipe (22) between two suction openings (26, 28) an opening, in particular a rectangular opening connects said openings. 4. Spinning frame as claimed in any one of preceding claims, wherein an opening (26,28) of the suction pipe (22) in relation to the symmetrical plane (30), which is at a right angle to the axis of the condensing element (12) or to the clamping roller (16), is inclined at an angle of between 40° and 70°, in particular of 50°. 5. Spinning frame as claimed in any one of preceding claims, wherein lor an arrangement of two suction openings (26, 28) on a suction pipe a rib (24) is being applied in its symmetrical plane (30), whose free longitudinal edge runs parallel to the pipe axis and whose head edge encloses an angle of 40° to 60°, 50° in particular, with the axis. 6. Spinning frame as claimed in any one of preceding claims, wherein in a cross sectional plane parallel to the axis of the condensing element (12) or to the clamping roller (16) respectively, the suction pipe (22) has a flat shape. 7. Spinning frame as claimed in any one of preceding claims, wherein the suction opening is of oval shape. 8. Spinning frame with a drafting unit (8) on whose outlet a suction pipe is being arranged, which is directed towards a clamping gap between two rollers (12,16), characterised in that the pipe, next to a thread being led away from the drafting unit, at its end being directed towards the clamping gap, between the surface of a roller (12) and a plane within which several threads (20) lay next to each other, comprises at least one opening (26, 28), whereat said opening is being offset towards the axial direction of the roller (12) or the clamping gap (16) respectively, in relation to the axis of the suction pipe (22), and whereat said opening is being directed towards a thread (20) which is being led at a close distance in relation to the suction pipe (22). 9. Spinning frame with a suction pipe at a condensing device, substantially as hereinabove described and illustrated with reference to the accompanying drawings.

Documents:

0975-mas-2000 abstract-duplicate.pdf

0975-mas-2000 claims-duplicate.pdf

0975-mas-2000 description (complete)-duplicate.pdf

975-mas-2000-abstract.pdf

975-mas-2000-claims.pdf

975-mas-2000-correspondnece-others.pdf

975-mas-2000-correspondnece-po.pdf

975-mas-2000-description(complete).pdf

975-mas-2000-drawings.pdf

975-mas-2000-form 1.pdf

975-mas-2000-form 19.pdf

975-mas-2000-form 26.pdf

975-mas-2000-form 3.pdf

975-mas-2000-form 5.pdf

975-mas-2000-verification documents.pdf