EP1561845B1 - Method and device for monitoring the core element during production of core-garn - Google Patents

Description

The invention relates to a method and an apparatus for producing core yarn, wherein a core thread is fed to a roving before the roving is solidified by rotation, and a device therefor.

STATE OF THE ART

As is known, core yarn is produced by inserting a core thread into the fiber roving during the stretching of a roving and solidifying it by twisting it and wrapping it around by sheath fibers so that the core thread is no longer as visible as possible. In this way, for example, an elastic yarn is produced. The core thread substantially determines the strength and elongation of the produced core yarn, while the sheath fibers primarily determine the feel and appearance of the yarn. Therefore, synthetic threads are usually used as core threads, while staple fibers, such as cotton and / or wool, are mostly used as sheath fibers.

The production of core yarn is used for example in the DE 195 01 163 C1 or even the DE 198 15 054 C1 described. Next discloses the DE 1964222A1 a device according to the introductory part of claim 1.

TASK

The object of the present invention is to improve and accelerate the production of core yarns.

SOLUTION OF THE TASK

To achieve this object, the core thread is monitored for breakage prior to combination with the roving.

By this monitoring is very quickly detected if a core thread is broken, so that very quickly an intervention in the spinning process can be done, which fixes the yarn breakage and leads as quickly as possible to another proper manufacturing process of the core yarn.

It is intended to mechanical monitoring, which detects the presence of the Vorfadens, to optical devices, which consider the Corefaden or to capacitive or inductive monitoring. It is essential that a thread break should be detected as quickly as possible.

Apart from a thread break but also a statement is possible, if the core thread meets certain specifications. The specifications may relate, for example, to its shape. If the diameter of the core thread falls below a desired limit, this can also be detected by the monitoring device. This also applies if, for example, the core thread has a specific coating which can be recognized in color.

According to the invention, a roller is assigned to the core thread which rotates with the core thread. The rotation of this roller is observed. In a simple embodiment, this can be done optically, for example, by a corresponding photo sensor as a receiver reflected light from parts of the wheel, such as spokes, webs or the hub recognizes. In this case, a transmitter is assigned to the photosensor, which emits light, which is reflected. When this light reaches the receiver in a pulsating manner, it means that the roller is rotating, that is, no thread break has taken place. However, if the receiver emits a continuous signal to a monitoring unit, this means that the roller is standing and the core thread is broken.

So that it is already recognized that a thread break has taken place, even though a very smooth-running roller still rotates, a limit value can also be entered in the control, so that an alarm signal is already emitted when a certain pulse rhythm is undershot.

According to the invention, the roller is located on a pivoting arm, in which the entire testing device for the rotation of the roller is included. This is especially true for the above-mentioned light source and the receiver, where, as also mentioned above, other test equipment can be used.

Preferably, there is still a switch on the swivel arm, with which the test device can be turned off when it is no longer needed at the moment.

DESCRIPTION OF THE FIGURES

Figur 1

eine schematische Seitenansicht eines Streckwerksbereiches mit Corefaden, Zuführung und dessen erfindungsgemässer Überwachungseinrichtung sowie einer Spindelreihe;

Figur 2

eine vergrössert dargestellte Explosionsdarstellung der Überwachungseinrichtung für das Corefaden gemäss Figur 1.

Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing; this shows in

FIG. 1

a schematic side view of a drafting area with Corefaden, feed and its inventive monitoring device and a spindle row;

FIG. 2

an enlarged exploded view of the monitoring device according to the Corefaden FIG. 1 ,

In FIG. 1 a roving 1 is passed through a drafting 2 and there stretched or refined in a known manner. The drafting system 2 consists essentially of known top rollers 3.1 to 3.3 and bottom rollers 4.1 to 4.3, wherein top roller 3.2 and bottom roller 4.2 still cooperate with also known straps 5.1 and 5.2.

Before the top roller 3.3 and the bottom roller 4.3 of the roving 1 a Corefaden 6 is supplied, which comes from a Corefadenspeicher 7.

The core thread is, as in the DE 198 15 054 C1 described, combined with the roving 1. Both leave as a core yarn the drafting 2 in the direction of yarn sleeve 9. Before running onto the yarn tube 9, the core yarn 8 passes through a yarn guide (Sauschwänzle) 10 and a ring traveler eleventh

Between drafting 2 and Corefadenspeicher 7 the core thread 6 is assigned a monitoring device 12. This has a housing-fixed support arm 13 which is connected via a hinge 14 with a pivot arm 15. At the free end of the pivot arm 15 sits a roller 16, which is partially wrapped by the core thread 6 and driven by this.

Parts of the pivot arm 15 are in FIG. 2 shown. At one end, the swivel arm 15 has a joint sleeve 17, which forms part of the joint 14 with the support arm 13.

At the other end, a print 19 is mounted on a Schwenkarmgehäuse 18, on which a not shown in detail electronics for controlling the monitoring of the core thread 6 is arranged. This also includes a switch 20, with the electronics, for example, can be turned off when pivoting the pivot arm 15.

The electronics also includes a transmitter 21 and an adjacently arranged, not shown receiver for example, an optical signal. Transmitter 21 and receiver are inserted into corresponding receivers 22 and 23 in the swivel arm housing 18 and can view spokes 24 of the roller 16. The roller 16 still has a groove 25 for the core thread. 6

The operation of the present invention is as follows:

The core thread 6 is subtracted from the core thread store 7 and fed to the roving 1. Before the union with the roving 1 of the core thread 6 rotates the roller 16. In this case, the core thread 6 rotates the roller 16, wherein the rotation is observed. For this purpose, the transmitter 21 emits a light which is reflected by the spokes 24 to the receiver. If the received light is pulsating, there is no thread break. On the other hand, if the received light is steady, there is a thread break, as either light from a spoke 24 or no light is constantly reflected.

If the pivot arm 15 is raised for inspection or reorientation of a core thread 6, the electronics are switched off by actuation of the switch 20.

Position Number List

1 roving 34 67 2 drafting system 35 68 3 top rollers 36 69 4 bottom rollers 37 70 5 Strappy 38 71 6 Core thread 39 72 7 Core yarn storage 40 73 8th Core yarn 41 74 9 yarn tube 42 75 10 thread guides 43 76 11 ring rotor 44 77 12 Monitoring device 45 78 13 Beam 46 79 14 joint 47 15 swivel arm 48 16 role 49 17 joint sleeve 50 18 swivel arm 51 19 Print 52 20 switch 53 21 transmitter 54 22 admission 55 23 admission 56 24 spoke 57 25 groove 58 26 59 27 60 28 61 29 62 30 63 31 64 32 65 33 66

Claims (6)

1. Device for the manufacture of core yarn (8), whereby a core thread (6) is conducted to a fibre sliver (1) before the fibre sliver (1) is consolidated by rotation, whereby a monitoring device is provided for the core thread (6) before being joined to the fibre sliver (1),
   characterised in that a roller (16) rotating with the core thread (6) is allocated to a pivot arm (15), whereby at least a part of the pivot arm (15) accommodates a checking device for the rotation of the roller (16) so that the core thread (6) is monitored mechanical, optical, capacitive, or inductive , in particular for a break.
2. Device according to Claim 1, characterised in that a receiver is allocated to a light source (21) in the pivot arm (15).
3. Device according to Claim 2, characterised in that the receiver for light reflected from parts of the roller, particularly from spokes (24) or webs, or the hub of the roller (16), is arranged next to the light source (21).
4. Device according to one of Claims 1 to 3, characterised in that a switch (20) is provided at the pivot arm (15).
5. Monitoring device for core yarn (8), characterised in that a roller (16) rotating with the core thread (6) is allocated to a pivot arm (15), whereby at least a part of the pivot arm (15) accommodates a checking device for the rotation of the roller (16), so that the core thread (6) is monitored mechanical, optical, capacitive, or inductive, in particular for a break.
6. Method for the manufacture of core yarn (8), whereby a core thread (6) is conducted to a fibre sliver (1) before the fibre sliver (1) is consolidated by rotation and whereby the core thread (6) is monitored before being joined to the fibre sliver (1), characterised in that by means of a roller (16), which is rotating with the core thread (6) and allocated to a pivot arm (15), and a checking device for the rotation of the roller (16) on at least a part of the pivot arm (15) the core thread (6) is monitored mechanical, optical, capacitive, or inductive , in particular for a break.

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