CN109642379B

CN109642379B - Device for monitoring yarn breakage on textile machine

Info

Publication number: CN109642379B
Application number: CN201780038841.3A
Authority: CN
Inventors: 汉斯-罗胡斯·格罗斯; 尼古拉斯·弗雷梅雷伊
Original assignee: Naehmaschinenfabrik Emil Stutznaecker GmbH and Co KG
Current assignee: Naehmaschinenfabrik Emil Stutznaecker GmbH and Co KG
Priority date: 2016-04-26
Filing date: 2017-04-20
Publication date: 2021-10-22
Anticipated expiration: 2037-04-20
Also published as: EP3449051A1; DE102016107728A1; DE102016107728B4; CN109642379A; WO2017186221A1

Abstract

The invention relates to a device for monitoring thread breaks on a multi-needle sewing machine, comprising at least one light source (1) for generating at least one light path (10) oriented along a thread row (2), wherein each thread (20) is assigned a thread break monitor (3) which is held by the intact thread (20) in a rest position outside the light path (10) and which enters the light path (10) in the event of a thread break (4). The basic object of the invention is to create a device with a cost-effective yarn break monitor which clearly indicates to the operator the location of the yarn break concerned. To this end, according to the invention, the thread break monitor (3) has the following properties at least in some regions: when entering the light path (10), the yarn breakage detector is illuminated by the entering of the light beam.

Description

Device for monitoring yarn breakage on textile machine

Technical Field

The invention relates to a device for monitoring (top and/or bottom) yarn breaks on a textile machine, in particular for sewing, quilting, knitting, weaving, knitting, winding and the like, comprising at least one light source for generating at least one light path oriented along a yarn row, wherein each yarn is assigned a yarn break monitor which is held by the intact yarn in a rest position outside the light path and which enters the light path in the event of a yarn break.

Background

The textile machine processes a large number of yarns arranged in rows at the same time. In this case, it can happen that one or more of the threads of the plurality of threads tear (thread breaks) during the sewing process and thus lead to defective sewing. In order to stop production directly when a yarn breaks, all processed yarns are usually monitored for yarn breaks.

For monitoring the yarn, various devices are known from the prior art. In addition to a reliable function, the purchase price is also important when selecting the monitoring device, since the machine requires one monitoring device for each thread to be monitored. Depending on the embodiment, a multi-needle sewing machine may require about 20 to 300 yarn breakage monitors.

A cost-effective device is described in the application DE 2214172 a. In the event of a yarn break, the opaque yarn break detector moves into the beam of the light barrier and interrupts the light barrier. The machine controller then automatically stops the machine. The thread break monitor interrupting the light path is embodied as a sliding body or a rolling body with thread guide grooves, wherein the thread break monitor can also be fastened at the lever or in another manner such that it interrupts the light path in the event of a thread break.

The device known from DE 2214172 a has the disadvantage that it is costly to find the relevant sewing position of the thread break, which the operator must find after the machine has stopped due to the thread break in order to then thread the thread again and start the machine manually. The more sewing positions the machine has, the more difficult it is for the operator to find the sewing position concerned.

In order to avoid such a complexity, devices are known which are provided with a yarn breakage monitor, wherein upon a yarn breakage the electrical circuit is closed and the lamp is therefore illuminated. However, this variant is relatively expensive, since all yarn breakage monitors must be equipped with electrical switches and lamps and furthermore all yarn breakage monitors must be electrically connected.

Furthermore, more complex solutions are known from the prior art, which are based on electronic monitoring. Due to the rapidly increasing overall cost of yarn break monitoring in multi-needle sewing machines, which is indicated by means of lamps or the like, it is also usual to provide such machines with yarn monitors which do not directly indicate the position concerned. In this case, the operator must identify the sewing position concerned by means of the defective thread.

A yarn breakage monitor is known from the document AT 300531B, which locally has the following properties: the yarn break detector is illuminated when entering the light path. However, the yarn breakage monitor is not illuminated by a light beam, but rather by a mechanical contact closure.

Furthermore, a yarn breakage monitor for a weaving machine in the form of a sheet is known from DE 3839254C 2, which comprises a fluorescent layer and which is illuminated after the machine has been shut down by means of an additional light source or via electroluminescence by means of an electric current. In this case, the beam along the thread row, which is interrupted by the thread break monitor in the event of a thread break, is not a beam, but rather a light cone, which is generated later by the operator and is not focused.

Disclosure of Invention

The basic object of the present invention is to create a device which eliminates the above-mentioned problems. The object of the invention is to develop a device with a cost-effective yarn break monitor which clearly indicates to the operator the location of the yarn break.

According to the invention, the above object is achieved in connection with the characteristic features according to the preamble of claim 1. Advantageous configurations and developments of the device according to the invention are given in the dependent claims.

According to the invention, a device of the type mentioned at the outset is characterized in that the yarn break monitor has, at least in places, the following properties: the yarn break monitor is illuminated by the light beam entering the light path.

In a particularly preferred embodiment of the invention, the light source is designed such that it emits a beam in the visible frequency range, which beam is preferably reflected and/or scattered by the yarn break monitor, advantageously in such a way that the light emerges at a defined angle relative to the light beam in the light path.

For this purpose, the yarn break monitor can, for example, comprise lenses and/or mirrors which redirect the incident light in such a way that the optics reflect the light, wherein it is particularly advantageous in this embodiment to diffuse the beam at least slightly.

Due to the diffuse radiation, at least a part of the light beam exits from the textile machine with its direction refracted away from the incident perpendicular to the yarn break monitor and therefore preferably at an angle of about 90 ° to the light beam along the light path on the front side, so that it can be easily recognized by an operator even in the presence of a plurality of yarn monitors arranged closely side by side.

In a further advantageous embodiment of the invention, the yarn breakage monitor is made at least in sections of a translucent plastic which is made to emit by means of incident light, particularly advantageously in such a way that the entire yarn breakage monitor is illuminated.

In another conceivable embodiment of the invention, the yarn break monitor comprises a substance which can be excited by light to emit light. For this purpose, for example, luminescent particles can be introduced at least locally into the yarn break monitor, which luminescent particles are caused to luminesce by irradiation.

Drawings

Further objects, features, advantages and possibilities of application of the device according to the invention emerge from the following description of an embodiment with the aid of the drawing. All described and/or shown features form the subject matter of the invention per se or in any combination, independently of the general description in the individual claims or their references.

In the drawings:

fig. 1 shows in perspective a plurality of yarn break monitors arranged in a row on an optical path;

fig. 2a, 2b show the yarn break monitor in front and side view with the yarn intact;

fig. 3a, 3b show the yarn breakage monitor in front and side views in case of yarn breakage.

Detailed Description

As can be seen from fig. 1, the device according to the invention comprises at least one light source 1 for generating a light path 10 oriented along the yarn row 2. Each yarn is assigned a yarn breakage monitor 3 which is quite particularly preferably introduced into a housing 30 surrounding the yarn breakage monitor.

As can be seen from fig. 2b, the housing 30 has a chamber 31 for guiding the yarn 20, in which the yarn monitor 3 is freely movably mounted in a direction substantially perpendicular to the light path, wherein the housing 30 and the chamber 31 have a passage opening 32 for the light path in a chamber region 31a, into which the yarn monitor 3 can be guided from the chamber region 31b in the chamber 31 in the event of a yarn break 4. With the yarn 20 intact, the yarn monitor 3 is held by the yarn 20 within the chamber region 31 b. The thread monitor 3 is preferably designed for this purpose as a sliding body or a rolling body with thread guide grooves.

In the present embodiment, the chamber 31 is embodied such that the yarn monitor 3 is guided into the lower chamber region 31a in the event of a yarn break 4 due to gravity. Furthermore, the yarn monitor 3 can also be spring-loaded or otherwise subjected to a force, for example, such that the yarn monitor is guided into the chamber region 31a in the event of a yarn break 4.

Quite particularly preferably, the device according to the invention is designed such that a cutting of the textile machine is brought about in the event of a break in one or more yarns. For this purpose, the thread monitor 3 can also be designed preferably as an interrupter of the light path 10, wherein the interruption causes a switch-off of the textile machine. Preferably, the cutting of the textile machine is only initiated here if a defined time period of the yarn monitor 3 entering the light path 10 is exceeded, since the yarn 20 is subjected in principle to a continuous stress difference during the textile process and therefore a brief entry of the yarn monitor 3 into the chamber region 31a can occur.

Fig. 1 shows a plurality of yarn breakage monitors 3 arranged in a row on the light path 10, wherein it can be seen that the housings 30 of the yarn breakage monitors 3 are partially so close to one another that a user cannot easily see a lateral emission (e.g. reflection of a light beam) of the yarn breakage monitors 3. For this reason, it is advantageous to design the yarn break monitor 3 such that the light reflected or otherwise guided through the yarn monitor exits at an angle of about 90 ° relative to the light path on the front side of the housing 30 (see fig. 3 a). For this purpose, the housing 30 preferably has a light passage opening 33 on the front side.

In a further embodiment of the invention, which is not shown, the entire housing 30 can also be designed such that it is illuminated by the light emitted from the yarn monitor (3).

The implementation of the device according to the invention is not limited to the preferred embodiments given above. On the contrary, a plurality of implementation variants are conceivable which can use the illustrated solution even in different types of implementation in principle.

List of reference numerals

1 light source

2 yarn rows

3 yarn breakage monitor

4 yarn breakage

10 optical path

20 yarn

30 casing

31 chamber

31a with a chamber region for the light path through the opening

31b chamber region

32 through opening for light path

33 light passing opening on front side

Claims

1. A device for monitoring yarn breaks on a multi-needle sewing machine, comprising at least one light source (1) for generating at least one light path (10) oriented along a yarn row (2), wherein each yarn (20) is assigned a yarn break monitor (3) which is held by the intact yarn (20) in a rest position outside the light path (10) and which enters the light path (10) in the event of a yarn break (4),

it is characterized in that the preparation method is characterized in that,

the yarn break monitor (3) has, at least in regions, the following properties: the yarn break detector is illuminated by the light beam entering the light path (10),

wherein the yarn break monitor (3) is designed to reflect and/or scatter a light beam, wherein a light passage opening (33) is provided on the front side of the housing (30) for light redirected by the light source (1) to shine from inside, wherein the yarn break monitor (3) is designed such that light reflected or guided past the yarn break monitor exits at an angle of about 90 ° with respect to the light path on the front side of the housing (30).

2. The apparatus of claim 1, wherein the first and second electrodes are disposed on opposite sides of the housing,

it is characterized in that the preparation method is characterized in that,

the light source (1) emits a beam in the visible frequency range.

3. The apparatus of claim 1, wherein the first and second electrodes are disposed on opposite sides of the housing,

it is characterized in that the preparation method is characterized in that,

the yarn break monitor (3) comprises lenses and/or mirrors that change the direction of incident light in such a way that the optics reflect the light.

4. The apparatus of claim 1, wherein the first and second electrodes are disposed on opposite sides of the housing,

it is characterized in that the preparation method is characterized in that,

the yarn breakage monitor (3) is at least partially made of translucent plastic.

5. The apparatus of claim 1, wherein the first and second electrodes are disposed on opposite sides of the housing,

it is characterized in that the preparation method is characterized in that,

the yarn break monitor (3) comprises a substance which can be excited by light to emit light.

6. The apparatus of claim 1 or 5,

it is characterized in that the preparation method is characterized in that,

at least partially, luminescent particles are introduced into the yarn break monitor (3), which are caused to luminesce by irradiation.

7. The device according to one of claims 1 to 5, wherein the yarn break monitor (3) is movably supported in a housing (30),

it is characterized in that the preparation method is characterized in that,

the entire housing (30) is designed in such a way that it is illuminated at least in some areas by the light emitted from the yarn break monitor (3).

8. The device according to claim 6, wherein the yarn break monitor (3) is movably supported in a housing (30),

it is characterized in that the preparation method is characterized in that,