Title of Invention

AN ARRANGEMENT FOR PRODUCING A SPUN YARN FROM A STAPLE FIBRE STRAND

Abstract

The invention relates to an arrangement for manufacturing a spun yarn (1) from a staple fibre strand (2), comprising a feed channel (8) for feeding the staple fibre strand (2), a yarn withdrawal channel (10) which comprises an entry opening (15), which yarn withdrawal channel (10) is arranged in a spindle-like stationary component (13), a fluid device for generating a vortex current around the entry opening (15) of the yarn withdrawal channel (10), an air evacuation duct (12) which surround the spindle-like component (13) in the form of a ring, and an injection channel (16) which can be docked to a compressed air source (17), which injection channel (16) is connected by a mouth piece (18) to the yarn withdrawal channel (10) and is directed towards its entry opening (15). A spindle point (19) which is manufactured as a separate component which component comprises an entry opening (15) of the yarn withdrawal channel (10) and the injection channel (16) and which component is attached to the spindle—like component (13).

Full Text

BACKGROUND AND SUMMARY OF THE INVENTION An arrangement for producing a spun yarn from a staple fibre strand The present invention relates to an arrangement for manufacturing a spun yarn from a staple fibre strand, comprising a feed channel for feeding the staple fibre strand, also comprising a yarn withdrawal channel which comprises an entry opening, which yarn withdrawal channel is arranged in a spindle-like stationary component, also comprising a fluid device for generating a vortex current around the entry opening of the yarn withdrawal channel, also comprising an air evacuation duct which surrounds the spindle-like component in the form of a ring, and comprising an injection channel which can be docked to a compressed air source, which injection channel is connected by a mouth to the yarn withdrawal channel and is directed towards its entry opening. An arrangement of this type is known from European published patent application 787 843. In the case of this arrangement, a staple fibre strand is drafted in the drafting unit to a fibre band, to which the spinning twist is applied in an air-jet aggregate. To this end the fibre band is first fed into a vortex chamber through a feed channel of the air-jet aggregate, to which vortex chamber a fluid device for generating a vortex current around a yarn withdrawal channel is arranged. Initially the front ends of the fibres held in the fibre band are hereby fed into the yarn withdrawal channel, while rear free fibre ends are spread out, seized by the vortex current and are wound around the already bound in front ends already located in the entry opening of the yarn withdrawal channel, which creates a yarn having, to a great extent, a true twist. An arrangement of this type permits particularly high speeds of more than 300 m per minute. When, in the case of the known arrangement, for any reason the fibre band or the spun yarn breaks, then, in the course of a piecing process, the end of the already spun yarn is fed back through the air-jet aggregate into the drafting unit in the opposite direction of the operational transport direction. For this purpose, an injection channel is provided in the spindle-like component, which injection channel is connected to the yarn withdrawal channel by a mouthpiece and directed towards the entry opening of the yarn withdrawal channel. When this injection channel is connected to a compressed air source, a suction stream is generated in the yarn withdrawal channel which flows towards the drafting unit, with the aid of which suction stream the already spun yarn end can be transported back to the drafting unit. The injection channel, shown only in Figure 10 of the above mentioned publication, is tapered in design and through the spindle-like component aligned diagonally to the yarn withdrawal channel. It is not disclosed in the above mentioned publication how the injection channel is made for practical arrangements. It is an object of the present invention to create favourable conditions in an arrangement of the above mentioned type so that such an injection channel can be made in a simple and cost-effective way. This object has been achieved in accordance with the present invention in that a separate spindle point comprising the entry opening of the yarn withdrawal channel is arranged to the spindle-like component, which spindle point comprises the injection channel. Because a separate spindle point is arranged to the spindle-like stationary component part, it is no longer necessary to apply a diagonal compressed air bore hole to the already complicated spindle-like component. Rathermore, the separate spindle point arranged to the now multipart spindle-like component can be designed in such a way that the injection channel can be made in a simple way and can be connected to a compressed air source. Although the spindle point at the spindle-like component can be attached in any desired way, for example, it can be adhered on, it is provided in a further embodiment of the present invention that the spindle point is inserted in the spindle- like component in such a way that it can be easily replaced, and is attached there, for example, by means of an O-ring. The injection channel can be applied to the spindle point in such a way that the injection channel begins with its end facing away from the mouth at a periphery surface of the spindle point arranged essentially perpendicularly to the injection channel. This permits the application of a thin bore hole perpendicular to a working surface, even when the injection channel extends diagonally to the yarn withdrawal surface. The present invention can be further designed in that the injection channel is continued outside of the spindle point in the spindle-like component at its end facing away from the mouth by means of a connecting channel, which can be connected to the compressed air source, in the case of such a design, it can be arranged that the connecting channel to be bored in the spindie-like component extends parallel to the yarn withdrawal channel. The connecting channel can then run in at a front surface of a recess for the spindle point. The present invention relates further for the described arrangement to a spindle point which is characterized in that it comprises a first part and an entry opening of a yarn withdrawal channel, which is connected via a mouthpiece to an injection channel, which injection channel is directed towards the entry opening. In addtion to the above decribed arrangement, the spindle point itself is a part of the patent protection. The spindle point can comprise a cylindrical guiding surface at its end area facing away from the entry opening , which cylindrical guiding surface can be inserted into a correspondingly formed hollow cylindrical recess of a spindle-like component. The above mentioned cylindrical guiding surface can end at a front surface. It can be further provided that at the intermediary area between the cylindrical guiding surface and the front surface of the spindle point a bevel or the like is provided, at which bevel the end of the injection channel facing away from the mouthpiece begins. A separate spindle point inserted into the stationary spindle-like component is also practicable when it does not comprise an injection channel, as such a spindle point can be considered as a spinning means, with which the character of the spun yarn can be altered. For example, the spindle point can be guided closer to or further away from the feed channel, which results in the yarn being spun with a greater or lesser hairiness. BRIEF DESCRIPTION OF THE ACCOMPANYING RAWINGS These and further objects, features and advantages of the present invention will become more readily apparent from the following detailed description thereof when taken in conjunction with the accompanying drawings wherein: Figure 1 is an enlarged depiction of an axial intersection of the air-jet aggregate in the area of the stationary spindle-like component, Figure 2 is an even greater enlarged axial intersection of the spindle point in the spindle-like component. Figure 2 is an even greater enlarged axial intersection of the spindle point in the spindle-liKe component. DETAILED DESCRIPTION OF THE DRAWINGS The arrangement shown in Figure 1 serves to produce a spun yarn 1 from a staple fibre strand 2. The arrangement comprises as essential component parts a drafting unit 3 and an air-jet aggregate 4. The staple fibre strand 2 is fed in delivery direction A to the drafting unit 3 and withdrawn as a spun yarn 1 in withdrawal direction B and fed to a winding device (not shown). The only partly shown drafting unit 3 is designed preferably as a three-cylinder drafting unit and comprises overall three roller pairs, which each comprise a driven bottom roller and a pressure roller flexibly pressed thereagainst. Only the delivery roller pair 5.6 is shown. In a drafting unit 3 of this kind, the staple fibre strand 2 is drafted in the known way to the desired degree of fineness. Directly downstream of the drafting unit 3, a thin fibre band 7 is present, which is drafted but still twist-free. The fibre band 7 is fed to the air-jet aggregate 4 via a feed channel 8. Downstream therefrom is a so-called vortex chamber 9, in which the fibre band 7 is imparted the spinning twist, so that the spun yarn 1 forms, and is withdrawn through a yarn withdrawal channel 10. A fluid device generates a vortex current in the vortex chamber 9 by means of blowing in compressed air through air-pressure jets, which are arranged tangentially in the vortex chamber 9. The compressed air exiting from the jet openings is guided off through an air evacuation duct 12, whereby this duct 12 comprises a ring-shaped cross section around a spindle-shaped stationary component 13, which comprises the withdrawal channel 10. In the area of the vortex chamber 9, a twist block, in the form of an edge of a fibre guiding surface 14, is arranged, which guiding surface 14 is arranged slightly eccentric to the yarn withdrawal channel 10 in the area of its entry opening 15. In the arrangement, the fibres to be spun are held on the one hand in the fibre band 7 and are thus fed from the feed channel 8 essentially without twist into the yarn withdrawal channel 10. On the other hand the fibres are subject to the effect of the vortex current in the area between the feed channel 8 and the yarn withdrawal 1 produced by the described process possess a core of fibres or fibre areas extending essentially in yarn longitudinal direction without any essential twist, and an outer area, in which the fibres or fibre areas are wrapped around the core. An arrangement of this type permits particularly high spinning speeds which lie in the range of 600 m per minute. When, for any reason, the still very unstable, untwisted fibre band 7 or the spun yarn 1 breaks, a piecing process subsequently takes place, in which the end of the spun yam 1 is fed back in the opposite direction to the withdrawal direction B towards the drafting unit 3. An auxiliary device for the purpose is provided in the form of an injection channel 16, which can be connected to a compressed air source 17, the mouthpiece 18 of which injection channel 16 is connected to the yarn withdrawal channel 10 and directed towards its entry opening 15. Thus a suction current can be achieved in the yarn withdrawal channel 10 which flows towards the drafting unit 3, which suction current feeds the end of the spun yarn 1 to the delivery roller pair 5,6. Because of the difficulties involved in applying in the spindle-like component 13 an injection channel 16 having only a small diameter and arranged diagonally to the yarn withdrawal channel 10, a spindle point 19 is provided according to the present invention which is arranged to the spindle-like component 13 and comprises an entry opening 15 of the yarn withdrawal channel 10 as well as the injection channel 16. Reference is made at this point in addition to the greatly enlarged depiction in Figure 2. Here the separately shown spindle point 19 with the injection channel 16, whose mouthpiece 18 is directed towards the entry opening 15, can be seen. The spindle point 19 is inserted into the spindle-like component 13 in such a way that it can be easily replaced and is attached there by means of an 0-ring 20. The injection channel 16 begins with its end 21 facing away from the mouthpiece 18 at a periphery surface 22 of the spindle point 19, which periphery surface 22 is arranged essentially perpendicularly to the injection channel 16. This permits the injection channel 16 to be easily applied in the spindle-like component 13 by means of a bore hole, even when the bore hole extends diagonally to the yarn withdrawal channel 10. At its end 21 facing away from the mouth piece 18, the injection channel 16 is continued outside of the spindle point 19 in the spindle-like component 13 by means of a connecting channel 23, which can, according to requirements, be 16 is continued outside of tlie spindle point 19 in ttie spindle-like component 13 by means of a connecting channel 23, which can, according to requirements, be connected to a compressed air source 17. Because a partitioning seam occurs in this way between the injection channel 16 and the connecting channel 23, the two channels do not need to be inclined at the same angle. The connecting channel 23 can therefore extend parallel to the yarn withdrawal channel 10, which can be made significantly easier than was the case in prior art. The connecting channel 23 can hereby run into a front surface 24 of a recess 25 for the spindle point 19. As can be seen in Figures 1 and 2, the spindle point 19 comprises the first part 26 and the entry opening 15 of the yarn withdrawal channel 10. The injection channel 16 runs into this first part 26 with its mouthpiece 18. The first part 26 belongs therefore to the yarn withdrawal channel 10 and extends coaxial thereto. The spindle point 19 has on the outside at its end area 27 facing away from the entry opening 15 a cylindrical guiding surface 28, which can be inserted in a correspondingly formed hollow cylindrical recess 25 of the spindel-like component 13. The cylindrical guiding surface 28 ends at a front surface 29. At the intermediary area 30 between the cylindrical guiding surface 28 and the front surface 29 a bevel 31 or the like is provided, at which the end 21 of the injection channel 16 facing away from the mouth piece 18 begins. WE CLAIM: 1. An arrangement tor manufacturing a spun yarn (1) from a stbaie fibre strand (2), comprising a feed channel feeainq the staple fibre strand (2), a yarn withdrawal channel (i». ) which comprises an entry opening (lb), which yarn withdrawal chainel (10) is arranged in a spindle-like stationary component (IJ), a fluid device for generating a vortex current around the entry opening (15) of the yarn withdrawal channel (10)» an air evaluation duct (12) which surround the spindle-like component (IJ) in the form of a ring, and an injection channel (16) which can be docked to a compressed air source (17), which injection channel (16) is connected by a mouth piece (18) to the yarn witidrawal channel (10) and is directed towards its entry opening (Jc), characterized by a spindle point (19) which is manufactured as a separate component which component comprises an entry opeimg (15) of the yarn withdrawal channel (lu) and the in!act ion channel (16) and which component is attached to the sp;i Idle-1 ike component (13). 2. An arrangement as claimed in claim 1, wherein the spiTdle point (19) is detachably attached to the spindle-like co«3onent (13). 3. An arraLJtgement as claimed in claim 2» wherein the tsp ndle paint (19) in .iittached in the ypindile—1 ike component part (i;/) by means of an 0-rinQ (20> . 4. An arrangement as claimed in any one of the claims 1 to 3, wherein the injection chanrtel (16) begins at iti3 end (21) faring away from the mouth piece (IB) at a pe?ripHery surface (22) oi the r>pi.ndle point (iV)? which surface (22) is essentially pe-pendicularly arranged to the injection channel (16), 5. An arrangement as claimed in any one of the claims 1 to 4ij wherein the injection channel (16) is continued at its end (11) facing away from the mouth piece (18) outside of the spindle pcmt (IV) in the spindle-like component (13) by means of a ccnnecting channel (23)» which can be connected with the ccmpressed air source (17). 6. An arrangement as claimed in claim 6) wherein the r.( nnecting channel (23) extends parallel to the yarn withdrawal c! anne ). ( iO) , 7. An arrangement as claimed in claim 6» wherein the com ectintj channel (23) runs into a front surface (24) of a rectss (2b) for the spindle point (19). B. A spindle point for an arrangement a« claimed in any orie of the above? claims* wherein the spindle point comprises a fxr it part C26) and an entry opening (1.5) of a yarn withdrawal cha me). (SCO which is connected to an injection channel iih) via a louth piece (iB)* said injection channel (16) being directed tow iv^dti the entry opening (lb). 9. A spindle point as claimed in claim B» wherein said spiTdle point comprises a cylindrnca). guiding surface (28) at its enc area (27) facing away from the entry opening (15)» which guiding surface (2B) can be inserted into a correspondingly formed hollow cylindrical recess (25) of a spindle—like component (1 . > . to. A spindle point as claimed in claim 9 wherein the cy indrical guiding surface (2B) ends at a front surface (29)« 11. A spindle point as claimed in claim V ar 10, wherein a be el (31) is provided in the intermediary area (2U) between the cylindrical guiding surface (28) and the front surface (29), at which bevel (31), the end (21) facing away from the mouth piece (18) of the injection channel (16) begins. The invention relates to an arrangement for manufacturing a spun yarn (1) from a staple fibre strand (2), comprising a feed channel (8) for feeding the staple fibre strand (2), a yarn withdrawal channel (10) which comprises an entry opening (15), which yarn withdrawal channel (10) is arranged in a spindle-like stationary component (13), a fluid device for generating a vortex current around the entry opening (15) of the yarn withdrawal channel (10), an air evacuation duct (12) which surround the spindle-like component (13) in the form of a ring, and an injection channel (16) which can be docked to a compressed air source (17), which injection channel (16) is connected by a mouth piece (18) to the yarn withdrawal channel (10) and is directed towards its entry opening (15). A spindle point (19) which is manufactured as a separate component which component comprises an entry opening (15) of the yarn withdrawal channel (10) and the injection channel (16) and which component is attached to the spindle—like component (13).

Documents:

00006-kolnp-2006-abstract.pdf

00006-kolnp-2006-claims.pdf

00006-kolnp-2006-description complete.pdf

00006-kolnp-2006-drawings.pdf

00006-kolnp-2006-form 1.pdf

00006-kolnp-2006-form 2.pdf

00006-kolnp-2006-form 3.pdf

00006-kolnp-2006-form 5.pdf

00006-kolnp-2006-international publication.pdf

00006-kolnp-2006-international search authority.pdf

00006-kolnp-2006-others.pdf

6-KOLNP-2006-(04-06-2012)-CORRESPONDENCE.pdf

6-KOLNP-2006-(04-06-2012)-PA.pdf

6-KOLNP-2006-ABSTRACT-1.1.pdf

6-kolnp-2006-abstract.pdf

6-KOLNP-2006-CLAIMS-1.1.pdf

6-kolnp-2006-claims.pdf

6-KOLNP-2006-CORRESPONDENCE-1.1.pdf

6-kolnp-2006-correspondence.pdf

6-kolnp-2006-description (complete).pdf

6-kolnp-2006-drawings.pdf

6-kolnp-2006-examination report.pdf

6-KOLNP-2006-FORM 1-1.1.pdf

6-kolnp-2006-form 1.pdf

6-kolnp-2006-form 18.pdf

6-KOLNP-2006-FORM 2-1.1.pdf

6-kolnp-2006-form 2.pdf

6-kolnp-2006-form 26.pdf

6-kolnp-2006-form 3.pdf

6-kolnp-2006-form 5.pdf

6-KOLNP-2006-FORM-27.pdf

6-kolnp-2006-reply to examination report.pdf

6-kolnp-2006-specification.pdf

6-kolnp-2006-translated copy of priority document.pdf