WO2004044292A1

WO2004044292A1 - Spinning machine provided with a clamping device

Info

Publication number: WO2004044292A1
Application number: PCT/CH2003/000728
Authority: WO
Inventors: Rudolf Wehrli
Original assignee: Maschinenfabrik Rieter Ag; Mondgenast, Peter
Priority date: 2002-11-11
Filing date: 2003-11-06
Publication date: 2004-05-27
Also published as: ATE454487T1; CN102212901B; CN101423989A; CN102212901A; CN101423989B; CN1774529B; AU2003273720A1; DE10252631A1; EP1560961B1; CN1774529A; JP2006505703A; JP4582637B2; EP1560961A1; AU2003273720A8; DE20221912U1; DE50312325D1

Abstract

The inventive spinning machine is provided with a drawing frame (1a) and a fibre assembly (11) which is shifted at several degrees by a guiding element (34). The extraction of short fibres contained in the assembly of drawn fibres is largely preventable, thereby making it possible to produce spun yarn exhibiting improved characteristics.

Description

Spinning machine with compression device

The invention relates to a spinning machine according to the preamble of the independent claim, it is also proposed for use in compression spinning machines according to claim 4. Spinning machines of this type either have a drafting system with a special outlet roller which is connected to a suction device, or a compression device working with negative pressure is connected to a conventional two-stage drafting system with three pairs of cylinders. The compression takes place on an air-permeable compression element which is moved with the fiber structure and which is subjected to negative pressure from the inside, the compression being effected by the suction air flowing transversely against the fiber structure.

With the development of new areas of application, in particular of compression spinning machines, there is a need to control the fiber structure as completely as possible on its way through the drafting device and, if necessary, to the compression device.

According to the invention, a special guide is provided in the main draft of the drafting system and / or before reaching the compression device, which allows the drawn fibers to drift apart less than in conventional drafting systems without forcing the individual fibers to change direction substantially. In one embodiment, this is achieved by a deflecting element, the surface of which is coated with at least some of the fibers, preferably in such a way that all fibers of a fiber assembly are deflected in the same way and / or in the same direction. This is preferably achieved by a prismatic deflection element - rod-shaped with essentially uniform cross sections, which is arranged transversely to the direction of flow of the fiber stream and is arranged in the longitudinal direction of the drafting cylinder. This guide element can be arranged immediately before the fiber structure runs onto a compression element. The change in direction of the fiber structure by the guide element is preferably 1.5 to 5 °. The spinning machine according to the invention in use in a multi-cylinder drafting system, with at least 3 pairs of drafting rollers and double straps on one of the pairs of rollers, wherein for guiding a fiber assembly one of the straps is directed as close as possible to an outlet cylinder against a pair of outlet cylinders, which cage from the strappy is looped, is characterized by an additional rod-shaped guide either for the fiber structure or for the strap, which guide is arranged between the strap and the outlet cylinder.

The guide can be concave towards the outlet cylinder and convex towards the fiber structure.

In a second embodiment, the guide can be arranged between two top rollers towards the apron so that, viewed from the outside, the strap undergoes a concave deflection. The additional guide for the fiber structure can be arranged in the transport direction of the fiber structure in or after a stretching area and before a compression area, in particular before the fiber structure emerges on a compression element of the compression device.

The invention is explained in more detail below with reference to the drawing in various exemplary embodiments. Show it:

Figure 1 and Figure 5 shows a cross section and a side view of a conventional two-stage drafting system, in which the guide element is integrated. Figure 2 shows a detail from Figure 1, showing the essential elements in the vicinity of the guide element. Figure 2a, the guide element with the fiber structure. Figure 3 shows the attachment of the guide to elements of the drafting system. FIG. 4 shows another exemplary embodiment for a drafting arrangement with a compression device, the latter being arranged downstream of the drafting arrangement.

Figure 6 shows a guide element on an apron, which allows a longer guidance of the fiber structure through the straps. Figure 7 different mounting options for the guide

The spinning machine is equipped with a compression device 1, which is connected to a drafting system 1a of the spinning machine, and is characterized by an additional guide 34 for the fiber structure, which in the transport direction of the fiber structure is after a stretching area 4, 5 and before a compression area, in particular before emergence of the fiber structure 11 is arranged on a compression element 19 of the compression device.

It can also be characterized by

that the guide 34 is arranged in the main draft zone of a multi-stage drafting system in front of the outlet cylinder 2,

that the guide element 34 of the guide is a prismatic rod which is arranged in the longitudinal direction of the drafting cylinder and has a cross section which is rounded on the functional side,

that the guide element 34 is arranged such that it is penetrated by a connecting line or tangent to a nip 23 between an outlet cylinder 2 and an upper roller 2 'pressed against it and the outlet nip between an upper apron 5 and lower apron 4 of the drafting system 1a,

that the fiber structure 11 or straps 5 by a few degrees, in particular 1.5

... 6 °, is redirected,

that the guide sits directly in front of the clamping gap 23 between the outlet cylinder 2 and a third upper roller 2 'of the drafting system pressed against it, that the outlet cylinder 2 of the drafting unit 1a is optionally designed as a compression element 19 of a compression device 1 with an air-permeable cylindrical surface,

that through a vacuum system 15 aerodynamic effects on the fiber structure

11 can be triggered in a compression zone 13,

that the guide element 34 is fastened by means of holding elements 340 to holding parts for straps, in particular a cage 30 for a straps 4, 5 of the drafting system 1a,

that leaf springs are attached to the ends of a guide element 34, fastened with a snap connection at the ends of a cage 30 for an apron 5 of the drafting system 1 a,

that a guide 34 for a fiber structure 11 with a deflection element 33 sits on an edge of a cage 30 for an upper apron 5 of the drafting system 1a on an edge of the cage 30 at a spacer 32,

that there is a guide 34 in front of the discharge cylinder 2 of the drafting system 1a and a further guide 34 'after the discharge cylinder 2 and in front of a compression device 1 with a compression element 19, in each case viewed in the transport direction of a fiber structure 11 through the drafting system 1a,

the features mentioned can be applied individually or cumulatively.

The drafting system 1a with the compression device 1 according to FIG. 1 transports a fiber structure 11 via an inlet cylinder 42 with a first top roller 42 'pressed against it through a pre-drafting field to a center cylinder 3 with a second top roller 3'. The middle cylinder 3 is wrapped by a lower belt 4 which, driven by the middle cylinder, runs over a bridge 40. Against the lower belt Chen 4 is pressed by means of a loading device 10 according to Figure 4, the upper roller 3 'with an upper strap 5 and a cage 30. The upper apron 5 is driven by it in contact with the lower apron 3, the fibers of the fiber composite 11 coming from the pre-drafting area between the inlet cylinder 42 and the middle cylinder 3 being retained in the main drafting area against the pull of the outlet cylinder 2. In this exemplary embodiment, the outlet cylinder 2 is designed as a compression element 19, ie as a perforated drum with internal suction. The upper strap 5 wraps around the second upper roller 3 ', on the one hand, and a spacer 32, which sits on the cage 30. A guide element 34 is arranged between the outlet point of the fiber bandage 11 from the lower apron 4 or upper apron 3 and the outlet cylinder 2 with the third upper roller 2 ', which deflects the fiber bandage 11 a little, as shown in FIG. 1, as a result of which the fibers of the Fiber dressing 11 is reached and in particular shorter fibers are prevented from detaching from the dressing. A round rod, in particular with a diameter between 3 and 6 mm, is preferably used as the guide element 34. The guide element 34 is arranged as close as possible to the surface of the discharge cylinder 2 or the compression element 19, with a distance of less than 1 mm. After being deflected by the guide element 34, the fiber structure runs up a few degrees on the surface of the compacting element 19, the looping path between the nip point of the third upper roller 2 'and the fourth upper roller 1' lying on the compacting element 19. A screen 19 'above the compression element 19 ensures that the incoming suction air is guided as parallel as possible to the axis of the outlet cylinder 2. The fiber structure is then preferably screwed in by means of a ring spinning device 40 and wound onto a yarn spool.

Figure 2 and Figure 2a show enlarged parts of the device in the vicinity of the guide 34, with which the fiber structure 11 is deflected by the angle α = 1.5 ... 6 °. With preferably a single adjustment of the guide element of the guide 34, yarns in the fineness range Ne 3 to 100, preferably 3 ... 50, in particular 3 to 30, can be spun. The template can consist of all known spinnable fiber materials also with a high short fiber content, especially carded cotton, also MMF, PES, blends. Thanks to the guide 34, good yarn quality Actual values achieved. The reference symbols in FIGS. 2 and 2a apply analogously to those in FIG. 1.

FIG. 3 shows two embodiments for fastening the guide 34 in the drafting system. The cage 30 for guiding the top straps 5 is mounted in a stationary but pivotable manner on the load device 10 mentioned with second top rollers 3 '. In the first exemplary embodiment of the guide element of the guide 34, this extends over the entire length of a section of the cage 30 in FIG. 3. The ends of the guide element 34 are held by holding elements 340, 340 '. The holding elements 340 are fixed in place at the ends of the cage 30, for example with the aid of fastening elements 342 in the form of pins or screws. The holding elements 340 can be made, for example, as leaf springs from spring steel. They can be snapped laterally into the ends of the cages by means of fastening pins 342 in bores in alignment with the fastening elements 342.

According to a second exemplary embodiment of the guide 34 in the right part of FIG. 3, a comparatively short guide element 34 is attached to the right longitudinal edge of the cage 30 by means of two holding elements 340, 340 ', at the ends of which riders 342 are seated. The riders 342 sit directly next to riders 320 of the spacer 32. The spacer serves to guide the top strap 5, which is deflected by the deflection element 33 between the riders 320. The riders 342, like the riders 320 of the spacer, shown in perspective view, can be designed with a greater distance between the riders 342 than between the riders 320. A holding element 340 is seated next to the rider 342 in the manner shown in FIG Spacer 32 on the cage 30. In addition to the cage 30, the spacer 32 is shown in perspective and the short guide element 34 with the holding elements 340 in perspective / schematic representation. As already mentioned, the guide element of the guide 34 is a preferably circular-cylindrical prismatic element. The guide 34 can also be fastened directly on the deflection element 33. Another embodiment of a drafting system with a compression device is shown in Figure 4. Of the drafting system 1a, only the middle cylinder 3 and the outlet cylinder 2 are shown with the upper rollers 3 '(second upper roller) and 2' (third upper roller) pressed on by the loading device 10. Between the third top roller 2 'and the fourth top roller 1' sits a further roller 27 which serves to drive the fourth top roller V through the third top roller 2 '. In contrast to the arrangement in Figure 1, the outlet cylinder 2 is not designed as a compression element; this is to the left of it, a vacuum system 15 being wrapped around by a compression element 9 in the form of an air-permeable strap. The compacting element 19 is moved forwards along the compacting zone 13 by the fourth top roller 1 'with the fiber structure 11 or the yarn 25. The compression of the fiber structure 11 in the compression zone 13 takes place along a suction slot 17 through which air is drawn into the vacuum system 15. The axes 8 and 21 of the third upper roller 2 'and the fourth upper roller 21 are held by the loading device 10. The fiber structure 11 is held by an upper strap 5 on the second

Upper roller 3 'and a lower apron 4 are guided on the center cylinder 3 in the main drafting zone of the drafting system, a guide 34 being arranged between the aprons 4 and 5 in a known manner, with which the fiber structure is deflected by a very small angle between 1.5 and 6 °. The guide element 34 can, as described in connection with FIG. 3, be fastened to a cage 5 'of the top strap 5. From the nip 23 between the outlet cylinder 2 and the third top roller 2 ', which is pressed against the latter, until the compression zone 13 is reached, the fiber structure 11 can be supported by a further guide element 34'. This guide element can, for example, like the guide element 34 described, be designed as a circular cylindrical rod or, as indicated by dashed lines, as a flat, more or less flat guide part which extends at least in the region of the fiber structure 11 along the spinning machine. As already described above, the first guide element 34 improves the cohesion of the fibers in the main draft zone of the drafting system between the middle cylinder 3 and the outlet cylinder 2, while the second guide element 34 ′ serves as a guide table for the fiber structure between the outlet cylinder 2 and the compression element 19. The second nip 24 between the compression device 1 and the fourth top roller 1 ' limits the twist in the yarn 25, which originates from a downstream spinning device. The guide 34 is to be arranged in such a way that a connecting line between the clamping gap 23 of the outlet cylinder pair 2, 2 'and the outlet-side clamping point of the strappy pair 4, 5 partially penetrates the guide element 34.

The surface quality of the deflection or guide is to be selected depending on the desired effect and raw material. The deflection can be fixed or rotatable. The guide element 34 can also be attached to the deflection bridge 40.

5 can be concave toward the outlet cylinder 2, 2 'and convex toward the fiber structure 11.

According to FIG. 6, the guide 34 can be arranged between two top rollers 2 ', 3' towards the apron 5 in such a way that, viewed from the outside, this leads to a concave deflection through the guide 34. It is thus possible to bring the strap closer to the upper roll 2 ', with which the fiber structure 11 is guided over a longer distance if not additionally.

2 and 4, the additional guide 34 for the fiber structure in the transport direction of the fiber structure can be arranged in or after a stretching area 4, 5 and before a compression area, in particular before the fiber structure 11 runs onto a compression element 19 of the compression device ,

According to FIG. 7, the guide 34 can be fastened with holding elements 340a and 340c to axes of upper rollers 2 ', 3' or to a loading arm 344.

Claims

claims

1. Spinning machine with a multi-cylinder drafting system (1a), with at least 3 pairs of drafting rollers (2,2 ', 3,3') and double straps (4, 5) on one of the pairs of rollers (3,3 '), whereby to guide a fiber structure (11) by means of one of the straps (5) as close as possible to an outlet cylinder (2 '), a cage (30) is directed against a pair of outlet cylinders (2, 2'), which cage (30) is wrapped in the straps (5) by means of an additional rod-shaped guide (34) either for the fiber structure (11) or for the apron, which guide is arranged between the apron (5) and the outlet cylinder (2,2 ').

2. Spinning machine according to claim 1, characterized by a guide (34) which is concave towards the outlet cylinder (2,2 ') and convex towards the fiber structure (11).

3. Spinning machine according to claim 1, characterized by a guide (34), which is arranged between two top rollers (2 ', 3') to the strap (5) so that this is viewed from the outside by the guide (34) a concave deflection experiences.

4. spinning machine with compression device (1) in particular according to claim 1, which is connected to a drafting system (1 a) of the spinning machine, characterized by an additional guide (34) for the fiber structure, which in the transport direction of the fiber structure in or after a stretching area ( 4, 5) and in front of a compression area, in particular before the fiber structure (11) runs onto a compression element (19) of the compression device.

5. Machine according to one of the preceding claims, characterized in that the guide (34) is arranged in the main draft zone of a multi-stage drafting system in front of the outlet cylinder (2).

6. Machine according to one of the preceding claims, characterized in that the guide element of the guide (34) is a prismatic rod arranged in the longitudinal direction of the drafting cylinder.

7. Machine according to one of the preceding claims, characterized in that the guide element (34) is arranged such that it is connected by a connecting line or tangent to a nip (23) between an outlet cylinder (2) and an upper roller pressed against it ') and the outlet clamping point between an upper strap (5) and lower strap (4) of the drafting device (1a) is penetrated.

8. Machine according to one of the preceding claims, characterized by an arrangement of the guide (34) for the fiber structure so that it is deflected by a few degrees, in particular (1.5 ... 6 °).

9, Machine according to one of the preceding claims, characterized in that the guide sits directly in front of the clamping gap (23) between the outlet cylinder (2) and a third upper roller (2 ') of the drafting system pressed against it.

10. Spinning machine according to one of the preceding claims, characterized in that the outlet cylinder (2) of the drafting device (1a) is designed as a compression element (19) of a compression device (1) with an air-permeable, cylindrical surface.

11. Machine according to one of the preceding claims, characterized by a vacuum system (15), by means of which aerodynamic effects on the fiber structure (11) can be triggered in a compression zone (13).

12. Machine according to one of the preceding claims, characterized in that the guide element (34) by means of holding elements (340) on holding parts for straps, in particular a cage (30) for an straps (4, 5) of the drafting device (1a), is attached ,

13. Machine according to the preceding claim, characterized by leaf springs at the ends of a guide element (34), with a snap connection at the ends of a cage (30) for an apron (5) of the drafting system (1a).

14. Machine according to one of the preceding claims, characterized in that a guide (34) for a fiber structure (11) at a deflection element (33) on an edge of a cage (30) for an upper apron (5) of the drafting system (1a) one edge of the cage (30) sits at a spacer (32).

15. Machine according to one of the preceding claims, characterized by a guide (34) in front of the outlet cylinder (2) of the drafting system (1a) and a further guide (34 ') after the outlet cylinder (2) and in front of a compression device (1) with a Compression element (19), each viewed in the transport direction of a fiber structure (11) through the drafting system (1a).

16. Machine according to one of the preceding claims, characterized by a guide (34) for the fiber structure (11), which is designed as a deflection element for the fiber structure (11) in the main draft zone of the drafting system (1a) with a deflection angle between 2 and 6 °.

17. Machine according to one of the preceding claims, characterized in that the guide 34 is fastened with holding elements 340a and 340c to axes of upper rollers 2 ', 3' or to a loading arm 344.