EP1705271A1 - Method and device for manufacturing a core yarn - Google Patents

Abstract

A fiber band (3) being wrapped around a core fiber (2) to produce a core yarn (1) is changed during its compaction before joining with fiber (2) (i.e. band (3) is introduced separately from fiber (2) into the compaction device with a change in movement and only then contacted with fiber (2)). An independent claim is also included for apparatus for the process having a compaction device with an inlet slit (9) preceding a feed roller (4) for fiber (2) and a roller pair (15,16) and following a further roller pair (5,12), this slit (9) being tilted so as to provide a changing device (22) for band (3).

Description

The invention relates to a method for producing coregarn from a core thread and a fiber structure, which are connected to each other by rotating the fiber structure around the core thread, and a device therefor.

STATE OF THE ART

When core yarn is formed when forming the yarn, in particular in its stretching to a desired fineness and its solidification, inserted by turning a core thread in a fiber structure and wound by the fibers. This happens so far that the core thread disappears in the fiber structure. The core yarn essentially determines the strength and elongation of the yarn produced, while the fiber structure determines the feel and appearance of the yarn. As a core thread can serve, for example, an endless, synthetic thread, while staple fibers made of cotton or wool are usually used as a fiber dressing.

From the EP 0 635 590 B1 For example, it is known that a core thread is introduced directly into the pair of output rollers of a drafting system. This thread, together with the fiber structure, passes through the fiber-bundling zone between the pair of delivery rollers and a delivery roller pair in which the fibers are already applied to the continuous yarn by the combination and then twisted together to form a core yarn upon leaving the delivery roller pair. This means that the core thread and the fiber structure are already brought together before the compression device, so that the compression of the fiber structure is disturbed by the core thread. Furthermore, a traversing of the fiber structure to equalize the wear of the rollers is not possible.

The problem of traversing is in the EP 0 986 659 B1 addressed, with a core thread guide must be centered to the roving inlet funnel of a drafting, so that the core thread to the fiber structure always tapers in the middle. This position must be maintained while oscillating the fiber structure. For this purpose, roving inlet funnel and core thread yarn guide are mechanically coupled. however In this device, the composite of core thread and fiber structure also merges into the compacting device, so that there can no longer be any traversing of the fiber structure and also the compaction of the fiber structure is hindered by the core thread.

From the DE-OS 102 36 450 It is known to combine two converging, compressed fiber composites with at least one core yarn with these, wherein the core yarn can be varied.

In practice, the fiber structure is guided over a compression device that is clearly oriented in the transport direction so that there is no lateral displacement during compaction. The core thread is guided in the same plane in which the fiber strand runs.

Good yarn values are achieved by these conditions, however, increased wear of rolls with which the fiber structure comes into contact may result.

TASK

The present invention has for its object to meet the mentioned disadvantage.

SOLUTION OF THE TASK

To achieve this object, a method according to claim 1 and / or a device with features of claim 7.

This means that the fiber structure is supplied separately from the core thread of the compression device with a traversing movement and is preferably combined with the core thread only at the end of the compacting process or thereafter.

Preferably, the fiber structure should be changed before compacting. On the one hand, this improves the compacting of the fiber structure and, on the other hand, ensures that the fiber structure does not run into the surface of guide rollers, which otherwise can lead to unacceptable wear of the guide rollers. As a result, the life of the guide rollers is significantly increased.

Preferably, the core thread is guided stationary, although the invention should also encompass a traversing of the core thread.

The fiber structure is guided approximately parallel next to the core thread in the compacting device and in particular in the compacting zone formed before the compacting device. If the compression zone in a preferred embodiment has a suction slot, the fiber structure is essentially guided over this intake slot and alternated over the width of the intake slot. Preferably, only at the end of the intake slot or after the fiber strand and the core thread are combined with each other.

An apparatus according to the invention for carrying out the method has a compression device with a suction slot. This suction slot has edges or a Raffkante, which extends inclined to the direction of the core thread. In particular, the intake slot is curved wedge-shaped and tapered in the direction of the core thread.

The inventive method and the corresponding device can be provided not only in a re-creation of spinning machines, but also existing spinning machines can be equipped with the inventive device and operated with the inventive method.

DESCRIPTION OF THE FIGURES

Figur 1

eine teilweise dargestellte Seitenansicht eines Ausschnitts aus einer erfindungsgemässen Vorrichtung zum Herstellen von Coregarn;

Figur 2

eine schematisch dargestellte Draufsicht auf einen Teil der Vorrichtung gemäss Figur 1.

The invention will be described in more detail with reference to the following drawings; this shows in

FIG. 1

a partially illustrated side view of a section of an inventive device for producing core yarn;

FIG. 2

a schematically illustrated plan view of a part of the device according to FIG. 1

A core yarn 1 is produced according to FIGS. 1 and 2 from a core yarn 2 and a fiber structure 3. The core thread 2 is fed via an insertion roller 4 of a compression device which follows in the present embodiment, a drafting or is part of this drafting system. It consists essentially of a roller 5 with an evacuatable interior 6, wherein on a jacket 7 a Kompaktierzone 8 is formed. This Kompaktierzone 8 shows a suction slot 9, which is curved wedge-shaped. In other words, it has a decreasing width in the direction of travel x of the core thread 2, with a gathering edge 10 also being curved toward the core thread 2.

The compacting zone 8 is delimited by a nip line 11 of an outlet top roller 12 and a nip line 13 of a clamping top roller 14.

The outlet top roller 12, which is otherwise partially wrapped by the core thread 2, a pair of rollers 15 and 16, each with a Riemchenführung 17 and 18 assigned. Between the corresponding straps 19 and 20, the fiber structure 3 of the compacting zone 8 is supplied.

Preferably, the core thread 2 is drawn as shown by dashed lines via a guide 21 to the fiber structure 2, or directly via a clamping top roller 14th

The operation of the present invention is as follows:

The perforated roller 5 and the inner space 6 are referred to as compression means 24.

The core thread 2 is supplied to the compacting zone 8 via the introduction roller 4 and a stationary filament introduction 21, for example, by passing through the gap between the outlet top roller 12 and the roller 5. In the Kompaktierzone 8 it runs at the edge of the intake slot 9, where it can reach near the end of the intake slot 9 near its intake.

The fiber structure 3 is fed parallel to the core thread 2 of the compacting zone 8, wherein it also passes through the gap between the outlet top roller 12 and roller 5. After the corresponding nip line 11 of the fiber structure 3 is located over the wider, incipient region of the intake slot 9 and then passes as a result of the suction and Kompaktierwirkung along the gathering edge 10 toward the core thread 2, wherein it towards the end of the intake slot 9 or later with the Core thread 2 united by rotation. The combination is preferably done immediately before the nip line 13. After the nip line 13, the core thread / fiber bandage can still be given a turn, so that the fiber structure wraps around the core thread.

According to the invention, it is provided that the fiber structure 3 is oscillated prior to joining with the core thread 2, which is indicated by the double arrow 22. This ensures that the surface of the rollers 5, 12 and the straps 19 and 20 wear not concentrated, but are worn in a wider range, which increases their life. Furthermore, the separation of the core thread from the fiber strand in the compacting zone 8 does not disturb the compaction of the fiber material.

Preferably, a traversing device 22 for the fiber structure prior to entry into a drafting system 15, 16, that is still arranged before unwinding rollers, not shown in the drafting, with which traversing the fiber strand is moved transversely to the plane of Figure 1 back and forth.

The apparatus for producing coregarn 1 from a core thread 2 and a fiber structure 3, which are connectable to each other by turning the fiber structure 3 around the core thread 2, wherein a compression device with a suction slot 9 an insertion roller 4 for the core thread 2 and a pair of rollers 15, 16th upstream and preferably a further pair of rollers 5, 12 downstream, is thus characterized in that the suction slot 9 is inclined to the running direction x of the core thread 2, and that a traversing device for the fiber structure 3 is provided.

The fiber structure 3 is brought to the core thread 2 during compaction and combines with it only after compaction.

In the apparatus for producing coregarn 1 from a core thread 2 and a fiber structure 3, which are connectable to each other by turning the fiber structure 3 around the core thread 2, wherein a compression device with a suction slot 9, an insertion roller 4 for the core thread 2 and a pair of rollers 15, Preceded by 16 and preferably a further pair of rollers 5, 12 downstream, the intake slot 9 is inclined to the running direction x of the core thread 2, and a traversing device 22 for the fiber structure 3 is provided. <B> LIST OF REFERENCES </ b> 1 core yarn 34 67 2 core thread 35 68 3 fiber structure 36 69 4 infeed 37 70 5 roller 38 71 6 inner space 39 72 7 coat 40 73 8th compacting 41 74 9 intake slot 42 75 10 Raffkante 43 76 11 clamping line 12 ' guide 77 12 Discontinued top roll 45 78 13 clamping line 46 79 14 Terminal upper roll 47 15 roller pair 48 16 roller pair 49 17 apron guide 50 18 apron guide 51 19 Strappy 52 x direction 20 Strappy 53 21 Filamenteinführung 54 22 Double arrow, traversing device 55 23 56 24 compacting device 57 25 58 26 59

Claims (8)

A method of producing coregarn (1) from a core thread (2) and a fiber strand (3), which are joined to each other by twisting the fiber strand (3) around the core thread (2), the fiber strand (3) prior to bonding with the core strand (3) Core thread (2) is compressed, characterized in that the fiber structure (3) is changed during compression. A method according to claim 2, characterized in that the core thread (2) is guided stationary without traversing. Method according to one of claims 1 to 3, characterized in that the fiber structure (3) is guided in particular parallel to the core thread (2) over at least part of a suction slot (9) of a compression device. A method according to claim 5, characterized in that core thread (2) and fiber structure (3) are combined towards the end of the suction slot (9) or thereafter. Method according to one of the preceding claims, characterized in that the fiber structure (3) is brought to the core thread (2 ') during the compression and combines with it only after compaction. Apparatus for producing coregarn (1) comprising a core thread (2) and a fiber structure (3), which can be connected to one another by turning the fiber structure (3) around the core thread (2), wherein a compression device having a suction slot (9) forms an introduction roller (4) for the core thread (2) and a pair of rollers (15, 16) upstream and preferably a further pair of rollers (5, 12) downstream, characterized in that the suction slot (9) to the running direction (x) of the core thread (2) inclined, and that a traversing device (22) for the fiber structure (3) is provided. Apparatus according to claim 6, characterized in that the suction slot (9) tapers in a wedge shape in the running direction (x) of the core thread (2). Device according to one of claims 7 or 8, characterized in that a guide (12 ') of the core thread (2) is arranged and thus the course of the core thread (2') is selected so that it is on the downstream side of the compacting device to the fiber structure ( 3) is approachable.

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