CN101001987A

CN101001987A - Monitoring device

Info

Publication number: CN101001987A
Application number: CNA2005800272734A
Authority: CN
Inventors: 佩尔·约翰逊
Original assignee: Eltex of Sweden AB
Current assignee: Eltex of Sweden AB
Priority date: 2004-08-24
Filing date: 2005-08-22
Publication date: 2007-07-18
Also published as: JP2008510899A; SE0402063L; EP1781851A1; SE0402063D0; SE528931C2; WO2006022582A1

Abstract

The invention relates to a device for monitoring the arrival of a weft, preferably of a weft thread, in a weaving machine, for example of the type in which the weft is driven through a shed with the aid of a jet, for example an air jet, and which has a reed which is constructed from a number of vertically arranged slats with spacing and has a longitudinal channel for the weft, first means being provided at the location where the weft is to be monitored for transmitting light towards the channel in the reed for illuminating the weft with minimal reflection of light from the reed, and second means being provided at said location for detecting light substantially reflected from the weft.

Description

Surveillance equipment

The present invention relates to a kind of equipment of the introduction according to claims 1.

In the art, very need to improve the above arrival indicator of type openly of prior art, it is used to obtain the sensitive more and operation reliably about the dissimilar silk thread of considerable greater number.Especially, the intrinsic obvious same fine yarn of problem, monofilament lines in the indicator of prior art, have with the yarn of the very approaching reflecting attribute of background or silk thread and specific black silk thread relevant.And required in the art is, improves pure mechanical stability and mechanical strength, is used to realize long service life.Parts stand harsh especially load, this be because, reed or comb per second impact and surpass 20 strokes (stroke) or more in the loom of prior art, this means that the parts in the arrival indicator in the loom of prior art stand 50G or more harsh load, and move with 60 meters of approximate per seconds or faster speed at the loom equator or the weft yarn of prior art.Obviously, these extreme power and high speed have proposed extra high requirement to the equipment that is involved.

The task of forming basis of the present invention is by realizing a kind of significantly improved equipment that parallel monitors that is used for, to satisfy the hope and the needs of above-outlined.

According to the present invention, in the equipment of pointing out by means of foreword, solved this task, wherein provided the characteristic features of being set forth as claims 1.

The present invention has realized a kind of equipment, and it presents the significantly improved operational attribute of the indicator that is better than prior art.At first, for this difficult threads, such as having low light level reflection or not having the silk thread that light reflects, for example thin white nylon yarn, the silk thread that perhaps has the reflecting attribute identical with reed, for example loose lead silk thread will be realized significantly operation more reliably.Especially, a kind of silk thread in back has sizable difficulty of thereupon bringing up to now.According to equipment of the present invention an intrinsic major advantage be that than the equipment of operable prior art up to now, the signal that is obtained has less significantly uncertainty, and relevant with dissimilar silk threads more exactly.

To the present invention be described in further detail by with reference to the accompanying drawings below.Fig. 1 is the perspective view about the part of the reed of one embodiment of an apparatus according to the present invention.Fig. 2 shows the view similar to Fig. 1 according to another embodiment of equipment of the present invention.Fig. 3 is the side elevation view according to another embodiment of equipment of the present invention.Fig. 4 is the side elevation view according to another embodiment of equipment of the present invention.Fig. 5 is the side elevation view of the part of the embodiment in Fig. 3 and 4.

Now in conjunction with the parts of the known loom that utilizes the reed operation, describe the present invention in further detail, wherein reed comprises a large amount of laths that is parallel to each other 1.This loom or braiding machine be the air-jet loom of appointment normally.Lath 1 in the reed is parallel to each other, and is arranged to and has spaced relationship.Exist and have the reed of bigger and lath 1 that spacing is bigger and have thinner and the reed lath 1 that comparatively dense is arranged.The reed per second impacts about 20 strokes back and forth, this means that parts stand the mechanical stress up to 50G and bigger harshness.In go-go loom, also have in following loom, can predict this speed and load even higher.

Lath 1 is designed to form passage 2, and compressed-air actuated air blows parallel or silk thread with the speed up to about 60 metre per second (m/s)s by this passage 2.The loom of prior art usually is equipped with two sensors or indicator, and one of them points out that parallel or silk thread have reached enough distances, and another points out that silk thread or parallel walk too far.If parallel tension, then it will can not arrive indicator, and if parallel reach second indicator, then may have silk thread or weft breakage.In both of these case, loom stops.Time point when parallel reaches indicator is used to adjust the aerojet of blowing parallel, silk thread or yarn.

Embodiment according to equipment of the present invention illustrated in fig. 1 has light source 4, is used for basically from parallel or the silk thread or the yarn 3 of below illumination passage 2.This light source can be the LASER Light Source of a wavelength light, but also can be the combined light source of the light of identical or different wavelength.Light source 4 emission light 4A enter and by the space between the lath 1 in the reed, and leave admission passage 2.Optical sensor 5 is settled in position, is used for the light that sensing directly reflects from parallel 3 basically.Light source 4 and sensor or detector 5 are connected to box 6, and it lays the electronic installation that is used to adjust light source 4 and assesses self-detector or sensor 5.Box 6 also can be laid and be used to indicate from the signal of detector 5 and may be used to electronic installation that loom is stopped.

Fig. 2 shows another embodiment according to equipment of the present invention.In different figure, identical parts have been provided identical reference number.Main difference between this embodiment and the embodiment illustrated in fig. 1 is that light source 4 is used for making parallel 3 refractions of light beam 8 towards passage 2 towards minute surface 7 or prism 7 emission light beams 8.Like this, light beam 8 will be by the space between the lath 1.Obviously, do not exist any object to hinder light beam 8 by the some spaces between the lath 1.By means of detector 5 sensings (one or more) light beam 9 from parallel 3 reflections.

Fig. 3 shows another embodiment according to equipment of the present invention, and schematically illustrates light beam 8 basically and leave light source 4 and extend through optical conductor 10, and optical conductor 10 has been described in Fig. 5 in further detail.Reflection on the mirror-coated surface 11 of light beam 8 in optical conductor 10.Light beam 8 leaves optical conductor 10 by curved surface 12, and enters wherein by curved surface 13.The light beam that leaves optical conductor 10 is by the space between the lath 1, and admission passage 2, and it is reflected by the wall in parallel 3 and the passage 2 in passage 2.Line 14 is used to illustrate the arm that light source 4 is installed, and sensor or detector 5 may be placed online 14 end, and this line 14 can be crooked and extend up to parallel 3 and may cross parallel 3.Fig. 3 further illustrates leading edge by lath 1 towards arm 14 beam reflected.

Fig. 4 shows embodiment identical with Fig. 3 on the principle, but projects on the curved mirror 15 from parallel 3 beam reflected 9.This curved mirror 15 is assembled light beams 9, and they are guided to detector or the sensor 5 that is positioned on the arm 14, and arm 14 describes by means of line.Curved mirror 15 can also be lens, prism, optical conductor etc., perhaps their combination.

Known in the prior artly be curved surface 15 focused beams.Through assessment, verified suitable is, illumination and detecting from some millimeters the parallel or the light of silk thread at least.By plurality of detection device 5 orders are settled, can work together with plurality of detection device passage, this can provide the advantage of signal processing aspect, and this can comprise: the one or more light sources with light of identical or different wavelength; And, be used for the crew-served one or more optical sensors of same or a plurality of light sources.Contingent is that because dust, unwanted reflection or noise, detector has provided wrong output signal.For a plurality of passages,, then can produce and obtain to measure more reliably and assessment if in passage, have parallel or silk thread.

Advantageously, use spectral filter, be used to improve signal/noise relationship.There is photoelectric detector with spectral filter.And suitable is, uses some different optical wavelength, is used to improve the sensing of so-called difficult threads or yarn.

Claims

1. equipment, be used for monitoring the parallel of loom, preferably monitor the arrival of parallel, parallel silk thread for example, described loom has following type basically, wherein under the help of the injection of for example aerojet, drive parallel and pass through shed open, and described loom has reed, described reed is by the strip shaped tectonic with spacing of many positioned vertical, and have the warp-wise passage that is used for parallel, it is characterized in that, monitor that at needs the position of parallel provides first device, so that light passage transmission in reed of the below the warp direction between reed middle plate strip and lath, the minimum light that is used to be used to from reed reflects the parallel that throws light on, and provides second device in described position, is used to detect the light that reflects from parallel basically.

2. equipment as claimed in claim 1 is characterized in that, described first device comprises light source, this light source parallel by in the passage in the space between the lath of reed and substan that is directed being used for throwing light on.

3. equipment as claimed in claim 2 is characterized in that, light source is arranged in the side of the reed identical with the reed passage.

4. equipment as claimed in claim 1 is characterized in that, described second device consists essentially of optical sensor, and this optical sensor is provided for the light that reception is reflected from parallel basically.

5. equipment as claimed in claim 1 is characterized in that, described first device comprises light source and light reflecting device, and their co-operatings are used for making light between the lath towards the parallel transmission of passage and passage.

6. equipment as claimed in claim 1, it is characterized in that described first device comprises light source and optical conductor, partly be used for the angled basically refraction of light, and partly be used to assemble refract light, and described refract light guided to passage and parallel by the space between the lath.

7. equipment as claimed in claim 6 is characterized in that, optical conductor is rendered as specular surface and curved surface at input and output.

8. as the described equipment of any one claim in the claim 1～6, it is characterized in that light source is positioned at identical position with optical sensor.

9. equipment as claimed in claim 1 is characterized in that, described first device comprises one or more light sources of the light with identical or different wavelength, is used for same or a plurality of optical sensor co-operatings.

10. equipment as claimed in claim 1 is characterized in that, described second device comprises one or more optical sensors, is used for the one or more light source co-operatings with light of one or several wavelength.