GB2231886A

GB2231886A - Spinning winder for the production of staple fibre yarn

Info

Publication number: GB2231886A
Application number: GB9008953A
Authority: GB
Inventors: Manfred Puschmann; Volker Roland; Peter Voidel; Peter Sproed
Original assignee: Kombinat Textima VEB
Current assignee: Kombinat Textima VEB
Priority date: 1989-05-26
Filing date: 1990-04-20
Publication date: 1990-11-28
Also published as: IT9047986A1; IT1242700B; GB9008953D0; DE4000059A1; DD284489A5; IT9047986A0; JPH03823A

Description

2:2::9 I- a a 1::5, 1 SPINNING WINDER FOR THE PRODUCTION OF STAPnE FIBRE

YARN The invention relates to a spinning winder for use in spinning frames or machines for the production of staple fibre yarn.

A method of continuous spinning, twisting and winding of yarn is known, in which the yarn is given one part of its twist during spinning and the other part of its twist during winding. This can be effected such that a twist is imparted during the uninterrupted delivery of the untwisted yarn by drafting rollers while the spinning rotor continues rotating. The yarn is subsequently wound on cross wound packages from the filled spinning rotor, and transferred to a winding member after the spinning rotor has been filled. This process taking place alternately with two or more delivery mechanisms, winding members and spinning rotors (WP 22 772).

A method and a device for the simultaneous winding and twisting of yarn in a continuous spinning process is also known, in which the yarn is supplied to a centrifugal spindle by an automatic feeder and is then supplied from the centrifugal spindle to a bobbin. The continuous spinning process is achieved in that one centrifugal spindle takes up yarn from the feed mechanism t 2 while the yarn passes from the second, already filled centrifugal spindle, to the winding means. This process alternates. The yarn wound onto the bobbin can consist of one or even of a plurality of centrifugal spindle fillings (DE-OS 2,229,263). The disadvantage of this known method is that, apart from some theoretical drawbacks, it cannot be carried out in practice as it has been inadequately disclosed.

An object of the invention is to provide a spinning winder for the production of a staple fibre yarn in which the twist is imparted in two stages, which guarantees exact, productive co-operation between all component, allows ease of operation and access and yields a high quality of yarn.

In accordance with the invention the yarn path between the outlet of drafting rollers provided with a material stopping device and an aspirator and a centrifugal spindle is located at an acute angle to the vertical, the yarn path being directed obliquely downwards to the centrifugal spindle. A piecing injector, a yarn stop motion device and a yarn guide tube for the centrifugal spindle are integrated in bobbin is then preferably the yarn path. A winding device with a then arranged above the drafting rollers in 3 such a way that the yarn is taken off the centrifugal spindle by a take- off mechanism upward at an angle to the centrifugal spindle axis. Between the take-off mechanism and the winding device with the bobbin, there are preferably arranged an injector, a yarn store provided with a yarn stop motion device, a yarn feeder, a yarn aspirator, a yarn brake, a yarn cleaner equipped with the cutting device and yarn stop motion device, a splicer or knotter and a yarn searcher. The yarn guide tube and the centrifugal spindle are preferably arranged so as to be relatively movable such that the yarn guide tube performs the basic reciprocating movement and the centrifugal spindle performs the overall reciprocating movement and the centrifugal spindle is moved back into its starting position or into the vicinity thereof while the package is being worked off. The or each centrifugal spindle may have allocated to it a cleaning device, and the centrifugal spindle can then be driven out to its cleaning position.

The spinning winder can be constructed on one side for presentation of slivers with spinning cans arranged behind the spinning winder. For presentation of rovings, the spinning winder can be constructed on both sides with roving bobbins located above the drafting rollers or on one side with roving bobbins located above or below the drafting rollers.

4 The invention is described in more detail with reference to the following description and the accompanying drawings, wherein:

Figure 1 is a schematic representation of part of a spinning winder constructed in accordance with the invention; Figure 2 is a schematic representation of another spinning winder constructed in accordance with the invention; and Figure 3 depicts the different positions of the centrifugal spindles.

Figure 1 is a side view of part of a spinning winder configuration with storage cans 1 while Figure 2 is a side view of a spinning winder with roving bobbins 2. The staple fibre material 3 coming from the cans 1 (Figure 1) or from the roving bobbins 2 (Figure 2) is guided through drafting rollers 4 and, in the process, is drawn according to the desired yarn fineness. Before the process of imparting the twist in the first stage begins, the drawn staple fibre material 3 is conveyed into an aspirator 5, or the delivery thereof is interrupted via a fibre material stopping device 6. For carrying out the first twisting stage the yarn passes through a piecing injector 7, a yarn stop motion device 8, a yarn guide 41 tube 9 in succession and into a centrifugal spindle 10 The injector 7 is openable and closable and constructed as vortex injector charged with compressed air to close. The staple fibre material 3 which is coming from the drafting rollers 4 and running into the aspirator 5 or is freed by the fibre material stopping device 6 is taken up by the piecing injector 7, receives an initial twist and is presented to the yarn guide tube 9 to pass as a part twisted yarn 11 through the yarn guide tube 9 into the interior of the hollow centrifugal spindle 10. The yarn 11 is applied to the internal wall of the spindle 10 as a package and the yarn is then twisted between the centrifugal spindle 10 and the outlet of the drafting rollers 4 in the ratio of the speed of the centrifugal spindle 10 to the delivery speed. The vacuum prevailing inside the centrifugal spindle 10 aspirates the nascent yarn 11 through the yarn guide tube 9 and therefore assists the effect of the piecing injector 7. After application of the yarn 11 to the internal wall of the centrifugal spindle 10, the compressed air supply at the piecing injector 7 is interrupted and the piecing injector 7 is opened so that the yarn twist can run freely to the clamping point at the outlet of the drafting rollers 4 and possible yarn breakages are reduced. If a yarn breakage occurs, it is signalled by the yarn stop motion device 8 and the supply of staple fibre material 3 is interrupted for a certain time by the 6 fibre material stopping device 6, or the staple fibre material 3 is conveyed into the aspirator 5. For carrying out the second twisting stage and for winding the yarn 22, a take-off mechanism 12 is located between the piecing injector 7 and the yarn stop motion device 8. In addition, an injector 13, a yarn store 14 provided with a yarn stop motion device, a yarn feeder 15, a yarn aspirator 16, a yarn brake 17, a yarn cleaner 18 equipped with cutting device and yarn stop motion device, a splicer or knotter 19, aa yarn searcher 20 and a winding device with a bobbin 21 are arranged in succession in the yarn path. At the end of the first twisting stage, when the predetermined mass of yarn in the centrifugal spindle 10 has been reached, the take-off mechanism 12 which has been open hitherto for the free passage of yarn is closed and set into rotation so that it conveys the yarn 11 out of the centrifugal spindle 10.

The yarn twist imparted by the centrifugal spindle 10 now passes only to the nip of the take-off mechanism 12, causing the yarn 11 to be severed at the outlet of the drafting rollers 4. The liberated yarn end is grasped by the injector 13 and conveyed through the yarn store 14 into the yarn aspirator 16. The conveying speed imparted by the take-off mechanism 12 is sufficiently high to give the yarn 11 the hitherto absent twist in the z, 1 7 ratio of the speed of the centrifugal spindle 10 to the conveying speed of the take-off mechanism 12. The drawn staple fibre material 3 still located in the drafting rollers 4 is aspirated by the aspirator 5, and the further supply can be interrupted by the yarn material stopping device 6. Yarn 22 already located on the bobbin 21 of the winding device has been presented to the splicer or knotter 19 by the yarn searcher 20 before the end of the first winding stage. In terms of time this is possible because, in practice, the degree of twist for the yarn 11 in the first twisting stage is greater than in the second twisting stage and the time required for the second twisting stage, including winding, is therefore shorter than for the first twisting stage. Consequently, immediately after it is located in the yarn aspirator 16, the yarn 22 coming from the take-off mechanism 12 can be grasped between the yarn aspirator 16 and the outlet of the yarn store 14 by the yarn feeder 15 and can also be presented to the splicer or knotter 19. The storage of the yarn 22 in the yarn store 14 begins just before the yarn 22 is grasped by the yarn feeder 15 and the winding of the ready twisted yarn 22 begins after the two yarn ends have been joined in the splicer or knotter 19. As the winding speed is initially selected to be higher than the conveying speed of the take-off mechanism 12, the yarn store 14 is emptied and the winding speed is subsequently reduced to that normally 8 required for winding. If the yarn 22 breaks or is severed by the yarn cleaner 18 by cutting, the piece of yarn coming from the take-off mechanism 12 also enters the yarn aspirator 16. The yarn 22 located on the bobbin 21 is grasped by the yarn searcher 20 and is presented to the splicer or knotter 19, and the functions of storage, yarn feed, splicing or knotting and winding are repeated in a certain sequence, as described hereinbefore.

The yarn stop motion device 8 as well as the yarn stop motion device of the yarn store 14 and the yarn cleaner 18 serve to monitor the yarn 11;22 and trigger certain functions in the event of disturbances in the yarn path. The yarn brake 17 regulates the tension of the yarn 22 to be wound and at the same time serves to open any snarls occurring during storage.

Figures 1 and 2 show that work is carried out from top to bottom in the first twisting stage and from bottom to top in the second twisting stage and for winding the yarn 22, the partially twisted yarn 11 remaining in the yarn guide tube 9 during the change of cycle from the first to the second twisting stage. The yarn path between the outlet of the drafting rollers 4 through the stopping device 6 and the aspirator 5 to the centrifugal spindle 10 is disposed at an acute angle x to the 9 vertical and extending downwards.

Figure 3 shows various positions of the centrifugal spindle 10. At the beginning of the first twisting stage, the centrifugal spindle 10 is located in position A. The yarn package is built up in the centrifugal spindle 10 such that a constant basic stroke which is offset continuously until a certain overall stroke is achieved is performed by the yarn guide tube 9. This offset occurs due to displacement of the centrifugal spindle 10 into position B. As the second twisting stage and the winding process take place, the centrifugal spindle 10 is driven back according to pre-selectable courses of movement into its starting position A or into the vicinity thereof. As it is possible for yarn material resulting from yarn breakages or other deposits still to be present in the centrifugal spindle 10 at the end of a winding process, the centrifugal spindle 10 is guided relatively rapidly to the cleaning position in position C on completion of each winding process. Once this position is reached, the centrifugal spindle 10 is subjected to pneumatic or even mechanical cleaning by the cleaning device 23. After the cleaning operation, the centrifugal spindle 10 is again brought s quickly as possible into the starting position 1

Claims

1. Spinning winder for the production of a staple fibre yarn in which the yarn receives its twist in two stages by means of drafting rollers, centrifugal spindles and winding means, wherein the yarn is moved in a path between the outlet of drafting rollers provided with a stopping device and an aspirator and a centrifugal spindle and is located at an acute angle to the vertical, a piecing injector, a yarn stop motion device and a yarn guide tube are integrated in the yarn path, a winding device with a bobbin is arranged above the drafting rollers in such a way that the yarn is taken off the centrifugal spindle by a take-off mechanism upwardly at an angle to the axis of the centrifugal spindle and an injector, a yarn store provided with yarn stop motion device, a yarn feeder, a yarn aspirator, a yarn brake, a yarn cleaner equipped with a cutting device and yarn stop motion device, a splicer or knotter and a yarn searcher are arranged between the take-off mechanism and the winding device.

2. Spinning winder according to claim 1, wherein the yarn guide tube and the centrifugal spindle are arranged so as to be relatively movable such that the yarn guide tube performs the basic reciprocating movement and the 11 centrifugal spindle performs the overall reciprocating movement and the centrifugal spindle is moved back into its starting position or into the vicinity thereof as the package is being worked off.

3. Spinning winder according to claims 1 or 2, characterised in that the or each centrifugal spindle has a cleaning device and the centrifugal spindle can be orientated into a cleaning position.

4. Spinning winder according to any one of claims 1 to 3, and constructed on one side with spinning cans for presentation of slivers being arranged behind the spinning winder.

5. Spinning winder according to any one of claims 1 to 3, and further comprising roving bobbins located above the drafting rollers or on one side with roving bobbins located above or below the draft rollers.

6. Spinning winder substantially as described with reference to, and as illustrated in, Figure 1 or Figure 2 of the accompanying drawings or Figure 1 or 2 in conjunction with Figures 3 of the accompanying drawings.

1 Published 1990 at The Patent Office, State House, 6671 High Holborn, London WC1R4TP. Further copies maybe obtained from The Patent Office.

Sales Branch, St Mary Cray, Orpington, Kent BR5 3RD. Printed by Multiplex techniques ltd, St Mary Cray. Kent. Con. 1187 Sales Branch, St Mary Cray, Orpington, Kent BR5 3RD. llrinteO Dy Multiplex tecriniques Atc, bL naary, i-y. --- -- -