WO2017186221A1

WO2017186221A1 - Device for monitoring thread breakages in textile machines

Info

Publication number: WO2017186221A1
Application number: PCT/DE2017/100318
Authority: WO
Inventors: Hans-Rochus Gross; Nikolaus Fremery
Original assignee: Nähmaschinenfabrik Emil Stutznäcker GmbH & Co. KG
Priority date: 2016-04-26
Filing date: 2017-04-20
Publication date: 2017-11-02
Also published as: CN109642379A; DE102016107728A1; DE102016107728B4; EP3449051A1; CN109642379B

Abstract

The invention relates to a device for monitoring thread breakages in multi-thread sewing machines, comprising at least one light source (1) for generating at least one beam path (10) oriented along a series of threads (2), each thread (20) being associated with a thread breakage monitor (3) maintained in the rest position outside of the beam path (10) by means of an intact thread (20) and entering into the beam path (10) when the thread breaks (4). The aim of the invention is to provide a device with an economical thread breakage monitor that clearly indicates to the user the position relating to the thread breakage. As a result, the claimed thread breakage monitor (3) is designed at least in parts such that when it enters into the beam path (10), it is illuminated by the inlet of the beam of light.

Description

DEVICE FOR MONITORING FENCES

ON TEXTILE MACHINES

DESCRIPTION

Technical area

[0001] The present invention relates to a device for monitoring (top and / or bottom) thread breaks on textile machines, in particular for sewing, stitching, knitting, weaving, knitting, spooling and the like, comprising at least one light source for generating at least a beam path aligned along a row of threads, wherein each thread is associated with a held by an intact thread in the rest position outside of the beam path and entering the thread path in the beam path yarn break detector.

Background Art Textile machines simultaneously process a large number of threads arranged in a row. It can happen that during the sewing process, one or more of the many threads breaks (thread breakage) and this leads to faulty seams. In order to stop the production directly in case of a thread break, usually all processed threads are monitored for thread breakage.

For monitoring the threads various devices are already known from the prior art. In addition to a reliable function, the purchase price also plays a role in the selection of a monitoring device, since a machine requires a monitoring device for each thread to be monitored. Depending on the design, multi-needle sewing machines may require about 20 to 300 thread breakers. An inexpensive device is described in the application DE2214172A. During a yarn break, an opaque yarn break detector moves into the beam of a light barrier and interrupts it. The machine control then automatically stops the machine. The beam retracting yarn break detector is designed as a sliding or rolling body with a Fadenführungsnut, which can also be attached to a lever or otherwise such that it interrupts the radiation path at a yarn break.

A disadvantage of the device known from DE22141 72A is the complicated finding of the affected sewing position of the yarn breakage, which the operator must find after the machine break caused by the thread break, then to thread the thread again and start the machine manually. The more sewing positions a machine has, the harder it is for the operator to locate the affected sewing position.

In order to circumvent this effort, devices are known which provide yarn breakers in which closed at thread break a circuit and so a lamp is lit up. However, this variant is relatively complex, since all yarn break detectors must be equipped with an electrical switch and a lamp and, moreover, all thread break monitors must be electrically connected.

Moreover, even more complex solutions are known from the prior art, which are based on electronic monitoring. Because of the total costs for thread breakage monitoring with display by lamp, etc., which quickly add up in the case of a multi-needle sewing machine, machines are still frequently provided which have thread monitors which do not directly indicate the affected position. The operator must recognize the affected sewing position based on the missing thread. From the document AT 300 531 B, a yarn break detector is known, which is partially designed so that it is brought to light when entering the beam path. In this case, however, the yarn break detector is not lit by the light beam but by a mechanical contact closer.

Furthermore, from DE 38 39 254 C2 a yarn break detector for weaving machines in the form of a lamella is known, which includes a fluorescent layer and brought either by means of an additional light source or an electroluminescence by means of electric current after stopping the machine to light becomes. This is not a jet along a thread row, which is interrupted by the thread break detector when the thread breaks, but by an unbundled light cone subsequently generated by the operating personnel.

Presentation of the invention

The present invention is based on the object to provide a device which eliminates the aforementioned problems. The aim of the invention is to develop a device with low-cost yarn breakers that clearly indicate the operator affected by a thread breakage position. [001 1] According to the invention the above object is achieved according to the preamble of claim 1 in conjunction with the characterizing features. Advantageous embodiments and further developments of the device according to the invention are specified in the dependent subclaims.

According to the invention, a device of the type mentioned above is characterized in that the yarn break detector is at least partially designed such that it is brought to light when entering the beam path by the entry of the light beam. In a particularly preferred embodiment of the invention, the light source is designed such that it emits radiation in the visible frequency range, which is preferably reflected and / or scattered by the yarn break detector, advantageously in the form that the light with respect to the light rays in the beam path in radiates at a defined angle.

For this purpose, the yarn break detector, for example. Include a lens and / or a mirror, which changes the direction of the incoming light in such a way that the optics reflects the light, and it is particularly advantageous, the radiation in this embodiment at least slightly diffuse.

Because of the diffuse radiation occurs at least some of the light rays breaking their direction from Einfallslot on the thread break monitor away and thus preferably from the textile machine at the front at an angle of about 90 ° to the light rays along the beam path, so that this for the operator is easily recognizable even with the presence of a large number of closely arranged thread monitor.

[001 6] In a further advantageous embodiment of the invention, the yarn break detector is at least partially made of a partially transparent plastic, which is made to shine by the incoming light, very particularly advantageous in such a way that the entire yarn break detector is made to glow.

[001 7] In a further conceivable embodiment of the invention, the yarn break detector comprises a substance which can be excited by light to illuminate. For this purpose, for example, at least partially luminescent particles can be introduced into the yarn break detector, which are brought to light by irradiation. Brief description of the drawings

Other objects, features, advantages and applications of the device according to the invention will become apparent from the following description of an embodiment with reference to the drawings. All described and / or illustrated features, alone or in any combination form the subject matter of the invention, regardless of the summary in individual claims or their dependency.

In the drawings show

Fig.l numerous arranged in series yarn break detector on a beam path in a perspective view;

Fign.2a, 2b a yarn break detector in the front and side view with intact yarn;

[0022] FIGS. 3a, 3b show a yarn break detector in the front and side view with a broken yarn.

Embodiment of the invention

As can be seen from FIG. 1, the device according to the invention comprises at least one light source 1 for generating a beam path 10 aligned along the row of threads 2. Each thread is assigned a thread break detector 3, which is particularly preferably incorporated in a surrounding housing 30 is. As can be seen from Fig.2b, the housing 30 has a thread 20 leading chamber 31, in which the thread monitor 3 is mounted to move freely in a substantially orthogonal direction to the beam path, wherein the housing 30 and the chamber 31 in one Chamber region 31 a has a passage opening 32 for the beam path, in which the Thread monitor 3 of a chamber portion 31 b within the chamber 31 at a yarn break 4 is feasible. With the thread 20 intact, the thread monitor 3 is held by this thread 20 within the chamber 31 b. The thread monitor 3 is preferably designed as a sliding or rolling body with a Fadenführungsnut this.

In the present embodiment, the chamber 31 is designed such that the thread monitor 3 is guided by gravity at a yarn breakage 4 in the lower chamber portion 31 a. In addition, the thread monitor 3 may, for example, also spring-loaded or otherwise subjected to such force, that this is performed at a yarn breakage 4 in the chamber portion 31 a.

Most preferably, the device according to the invention is designed such that at one or more thread breaks switching off the textile machine is effected. For this purpose, a thread monitor 3 may preferably be designed as a breaker of the beam path 10, wherein the interruption causes a shutdown of the textile machine. The turning off of the textile machine is preferably only initiated when the thread monitor 3 has exceeded a defined entry length into the beam path 10, since the threads 20 are fundamentally subject to continuous tension differences during the textile processing and it can thus happen that the thread monitor 3 is entertaining the chamber area 31 a occurs.

FIG. 1 shows numerous serially arranged yarn break detectors 3 on a beam path 10, wherein it can be seen that the housings 30 of the yarn break detector 3 partly lie close to each other in such a way that lateral emission (for example reflection of the light rays) of the yarn break detector 3 not easily visible by the user. For this reason, it is advantageous to design a yarn break detector 3 such that the light reflected or otherwise guided by the thread monitor light front side of the housing 30 at an angle of approximately 90 ° exits the beam path (see Figure 3a). For this purpose, the housing 30 preferably has a light passage opening 33 on the front side.

In another, not shown embodiment of the invention, the entire housing 30 may be designed such that it is brought to light by the light emitted from the thread monitor (3) light.

The device according to the invention is not limited in its execution to the above-mentioned preferred embodiments. Rather, a variety of design variations are conceivable, which make use of the solution shown even with fundamentally different type of execution.

List of reference numbers

1 light source

2 thread series

3 thread breakers

4 thread break

10 beam path

20 threads

30 housing

31 chamber

31 a Chamber area with passage opening for the beam path

31 b chamber area

32 passage opening for the beam path

33 front light passage opening

Claims

Apparatus for monitoring yarn breaks on multi-needle sewing machines, comprising at least one light source (1) for generating at least one along a thread row (2) aligned beam path (10), each thread (20) of an intact thread (20) in the rest position outside the beam path (10) is held and associated with thread breakage (4) in the beam path (10) entering yarn break detector (3),

characterized in that

the yarn break detector (3) is designed at least in regions such that it is brought to light when entering the beam path (10) by the entry of the light beam.

Device according to claim 1,

characterized in that

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

Device according to claims 1 and 2,

dgdurch characterized, dgss

the Fgdenbruchwächter (3) is such that it reflects the light beam and / or scatters.

Apparatus according to claim 3,

dgdurch characterized, dgss

the earth break detector (3) surrounds a lens and / or a mirror which alters the direction of the incident light in such a way that the optics reflect light.

5. Device according to claims 1, 3 and 4,

characterized in that

the yarn break detector (3) is at least partially made of a partially transparent plastic.

6. Apparatus according to claim 1,

characterized in that

the ground fault monitor (3) comprises a material that can be excited by light to illuminate.

7. Device according to claims 1 and 6,

characterized in that

in the Fgdenbruchwächter (3) at least partially luminescent particles are introduced, which are brought to light by irradiation.

Device according to claims 1 to 7,

dgdurch characterized, dgss

the Fgdenbruchwächter (3) is cast in such a way that dgs reflected or ondersgrtig by the Fgdenwächter (3) guided light at an angle of approximately 90 ° relative to the beam path (10) emerges.

9. Device according to claims 1 to 8, wherein the yarn breakage monitor (3) is movably mounted in a housing (30),

characterized in that

dgs gesgmte housing (30) is gusgebildet such that it is brought by dgs by the Fgdenwächter (3) gusstrahlende light at least partially lit.