EP2462268A1 - Verfahren und vorrichtung zur überwachung der fadenankunft beim schusseintrag verschiedener schussfäden an einer webmaschine - Google Patents
Verfahren und vorrichtung zur überwachung der fadenankunft beim schusseintrag verschiedener schussfäden an einer webmaschineInfo
- Publication number
- EP2462268A1 EP2462268A1 EP10765564A EP10765564A EP2462268A1 EP 2462268 A1 EP2462268 A1 EP 2462268A1 EP 10765564 A EP10765564 A EP 10765564A EP 10765564 A EP10765564 A EP 10765564A EP 2462268 A1 EP2462268 A1 EP 2462268A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- signal
- weft
- weaving
- sensor
- weft thread
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000009941 weaving Methods 0.000 title claims abstract description 69
- 238000003780 insertion Methods 0.000 title claims abstract description 34
- 230000037431 insertion Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000012544 monitoring process Methods 0.000 title claims description 19
- 238000011156 evaluation Methods 0.000 claims description 15
- 230000001419 dependent effect Effects 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 8
- 230000006399 behavior Effects 0.000 claims description 6
- 230000005693 optoelectronics Effects 0.000 claims description 4
- 230000006870 function Effects 0.000 claims description 3
- 238000012937 correction Methods 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
- D03D51/18—Automatic stop motions
- D03D51/34—Weft stop motions
Definitions
- the present invention relates to a method and a device for
- Such a device is shown for example in EP 0 374 398 B1.
- This relates to a weft thread monitor for air-jet looms with a weft insertion of threads of different quality, wherein the threads are deducted from the respective yarn store and entered via an air entry control controlled main and Stafettendüsen in the air duct of a Profilriets and thus in a shed.
- the weft detector On the output side of the Profilriets the weft detector is arranged with sensors whose electrical signals are fed to the input of an amplifier and then the air intake control and evaluated there. Depending on the result of the evaluation, the entry process is continued or interrupted and an error message is output.
- Weft detector of the air intake control supplied an electrical signal, which is determined by the mechanical and air-effective properties of each weft thread.
- the amplifier is designed such that, depending on the characteristics of the weft threads, it amplifies the electrical output signal of the sensor before it is fed to the air intake control for evaluation.
- This correction of the output signals that the sensor sends to the air intake control via the amplifier is useful in order to avoid weaving errors.
- the system sensor / amplifier can be informed in a forward-looking manner, which signal strength at the next weft insertion depending on the
- Characteristics of the weft yarn is to be expected and how the signal amplification is to be made so that the evaluation unit of the air intake control detects whether the weft yarn arrived at the exit side - i. correctly registered or not.
- EP 1 445 365 B1 describes a method for monitoring weft threads on a weaving machine during the weaving pattern-dependent entry
- a reference threshold value and a gain factor are calculated from the sensor signal by means of an electronic control unit. This calculation takes place at certain times, which are specified via inputs of the operator with regard to the properties of the weft thread to be respectively entered in accordance with the weaving pattern. This is the case when comparing the signal actually generated when the weft thread passes through the sensor with the reference threshold value
- Object of the present invention is to provide a method and an apparatus, with the various for the supervision of the yarn arrival of the
- the object is achieved by a method and a device according to the
- a method for monitoring the yarn arrival of weft threads on a loom during the web pattern-dependent entry of different weft threads in a shed provides the monitoring of a weft to be inserted in the region of the end of the weft insertion path by at least one opto-electronic sensor.
- These waveforms are evaluated by at least one electronic control unit.
- sensor elements that are usually used to monitor weft yarns on weaving machines, when passing eg a thin weft yarn provide a different output signal than when passing through a thick weft thread.
- weft insertion of weft threads e.g. different thickness results therefore for each weft insertion in the weave a characteristic waveform at the output of the sensor.
- weft threads e.g. different thickness results therefore for each weft insertion in the weave a characteristic waveform at the output of the sensor.
- other properties of the weft threads can be the cause of different
- a smooth weft without fibers will produce different waveforms than a hairy weft - even if they have the same thread size.
- sensors with different technologies can be used within the scope of the invention, as far as they generate signal traces as the weft thread passes through the sensor, which are different for different types and different behavior of weft threads.
- sensors may be, for example, opto-electrical sensors in which one or more light beams are emitted by at least one transmitter and the light is detected by one or more receivers, as long as the light beam is not or only partially e.g. interrupted by a weft thread.
- sensors are often housed today with its own electronics unit within a common housing. This electronic unit controls e.g. the light signal and prepares the signals generated by the light receiver for further processing in the electronic control unit of the loom. It may also be necessary to send signals to the electronics unit of the sensor from the loom control unit.
- sensor an assembly which - depending on the type of sensor - and an electronic unit of the here
- waveform of the sensor is thus meant the course of the signal, which is generated either by the sensor directly or by the associated with this own electronic unit.
- sensors in which the light emitted by at least one transmitter reflects off obstacles in the region of the light beam and detected by one or more receivers arranged to receive reflected light from the receivers and convert the light intensity and / or the position into an electrical signal.
- different positions of the weft thread passing through the sensor in the region of the sensor can also generate different signal profiles that can be evaluated by the control unit. This means that with these sensors, the behavior of the weft thread in determining the
- Waveforms is taken into account.
- the sensor is usually mounted at the end of the weft insertion path.
- the sensors referred to here are thus in the area of the
- the reference signal consists of a single signal value (e.g., an average value) that is electronically compared at a particular time during the weaving cycle with the actual waveform by the control unit.
- Weft thread generated by the sensor signal curves at least one typical for the weaving pattern to be entered weft thread typical reference signal calculated and stored.
- the actual signal curve can still be processed, that is to say electronically amplified, integrated, averaged or otherwise suitably changed for the evaluation and the electronic comparison in a manner known per se.
- Such methods for comparing different waveforms are known in the art.
- the signal curves are taken into account, which are generated by the sensor during the passage of the weft thread.
- reference signals also take place from the signal curves of the first sensor.
- the evaluation of the signals in the electronic control unit for the purpose of monitoring the yarn arrival of the weft thread can take into account not only the comparison of the signal characteristics of the sensor but also further electrical signal values present in the control. However, signal values due to operator input regarding the various weft threads to be monitored are not required.
- the electronic control unit outputs at least one of a plurality of possible signals.
- at least one signal for WM stop is output when the
- Evaluation of the signals by the controller reveals that the weft thread has not arrived or broken in the area of the end of the shed.
- the web process is interrupted; It makes sense to output an error message to the operator.
- This output is e.g. to various components involved in the web process. These may be, for example, the main drive, the feeder or the weft insertion components.
- a signal output to the possibly existing electronic unit of the sensor is feasible if necessary.
- the evaluation is used in a learning phase of the weaving machine to calculate first reference signals without error messages are already brought about with stop the weaving machine, if the comparison between the actual signal and the reference signal negative.
- the control unit works in a so-called learning phase. This is e.g. useful when weaving new fabric patterns with changed weft threads to be entered in accordance with weaving patterns.
- a device comprises at least one sensor in the region of the entry path for monitoring the thread arrival when various weft threads are introduced into the shed of a weaving machine.
- the sensor is of the type required for the method according to the invention as described above. That is, sensors are used which generate signals as the weft passes through the sensor for various types and / or different behavior of weft yarns
- the sensor or sensors are usually mounted at the end of the entry path.
- control device which is connected signal transmitting with one or more sensors.
- the control device comprises elements that enable the entry of different weft threads depending on the weave pattern.
- the control device is signal-transmitting connected to other important for the weaving process components of a loom; for example with the main drive and the components of the weft insertion.
- display devices can be provided which make messages of the control device visible to the operator.
- control unit with such hardware and software
- Input options are available with which the operator can specify a learning phase during which the first reference signals are determined.
- input possibilities are provided by means of which the operator can specify the number of weaving machine looms which should underlie the calculation of the reference signal for each weft thread to be entered in dependence on the weaving pattern.
- FIG. 1 Schematic representation of an embodiment of
- FIG. 2 shows exemplary signal curves at the output of a sensor
- FIG. 1 shows an embodiment of the device according to the invention.
- the device according to the invention is also in weaving machines with other entry principles - e.g. Water jet machines - used in which the
- Monitoring the thread arrival is made by a sensor at the end of the entry path.
- a weft thread 1 is made up of a number of weft threads 1, 2, 3... N
- the profile sheet 12 is in the range of warp threads, not shown, which form a shed.
- the weft insertion path 5 extends in in this case, from the main nozzles 10 across the width of the shed to the outermost position taken by the front weft end
- Weft insertion can take.
- the arrival of the weft 1 at the end of the weft insertion path 5 is monitored by one or more sensors 4 located in the region of the end of the weft insertion path.
- the sensor 4 which may also contain its own, not shown, electronics, generates a waveform 6, which is passed on to an electronic control unit 7 on.
- the signal profile 6 is evaluated with the method according to the invention described above.
- control unit 7 optionally outputs a signal 11 to various weaving machine components 8, 9, 10, 13. If necessary, a signal can also be returned to the sensor 4 or to the electronics connected to the sensor.
- Figure 2 shows measured waveforms 6.1, 6.2, 6.3 6.n at the output of a
- FIG. 2 shows several of these passage processes with their respectively typical signal progressions 6.1, 6.2, 6.3, 6.n in chronological order of several
- the behavior is shown by way of example on an air-jet loom, in which an opto-electronic sensor 4 is arranged at the exit of the channel of a profile reed 12.
- Each individual signal course 6.1, 6.2, 6.3... 6.n indicates the arrival of the respective weft thread 1, 2, 3... N at the end of the entry path and thus the successful weft insertion. If the weft insertion is incorrect, the relevant signal is missing.
- the undesirable, but unavoidable entry of fiber dust or fluff results in a signal curve 6, which depends on the one for the weave pattern weft thread typical signal waveform deviates - either in height and / or in terms of the timing of the signal. This is detected in the evaluation of the waveforms 6 with the aid of the inventively determined reference signal and the process is interpreted by the control unit 7 as improper weft insertion.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009035904A DE102009035904A1 (de) | 2009-08-03 | 2009-08-03 | Verfahren und Vorrichtung zur Überwachung der Fadenankunft beim Schusseintrag verschiedener Schussfäden an einer Webmaschine |
PCT/DE2010/000867 WO2011015178A1 (de) | 2009-08-03 | 2010-07-24 | Verfahren und vorrichtung zur überwachung der fadenankunft beim schusseintrag verschiedener schussfäden an einer webmaschine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2462268A1 true EP2462268A1 (de) | 2012-06-13 |
EP2462268B1 EP2462268B1 (de) | 2015-01-21 |
Family
ID=43221910
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10765564.9A Active EP2462268B1 (de) | 2009-08-03 | 2010-07-24 | Verfahren und vorrichtung zur überwachung der fadenankunft beim schusseintrag verschiedener schussfäden an einer webmaschine |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2462268B1 (de) |
JP (1) | JP5575898B2 (de) |
CN (1) | CN102471959B (de) |
DE (1) | DE102009035904A1 (de) |
WO (1) | WO2011015178A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT201800006835A1 (it) * | 2018-06-29 | 2019-12-29 | Dispositivo ottico per il rilevamento delle trame corte in un telaio tessile |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3843683A1 (de) * | 1988-12-23 | 1990-06-28 | Dornier Gmbh Lindauer | Schussfadenwaechter fuer luftwebmaschinen |
US5295515A (en) * | 1991-02-25 | 1994-03-22 | Kabushiki Kaisha Toyoda Jidoshokki Seisakusho | Apparatus for controlling weft insertion in jet loom |
JP3982809B2 (ja) * | 2002-09-06 | 2007-09-26 | 津田駒工業株式会社 | 織機の不良内容表示装置 |
JP4128458B2 (ja) | 2003-01-22 | 2008-07-30 | 津田駒工業株式会社 | 織機における緯糸検知方法 |
CN2718001Y (zh) * | 2004-04-30 | 2005-08-17 | 娄国梁 | 纬纱检测器 |
JP2005336624A (ja) * | 2004-05-24 | 2005-12-08 | Tsudakoma Corp | 織機の設定装置 |
-
2009
- 2009-08-03 DE DE102009035904A patent/DE102009035904A1/de not_active Withdrawn
-
2010
- 2010-07-24 EP EP10765564.9A patent/EP2462268B1/de active Active
- 2010-07-24 CN CN201080034517.2A patent/CN102471959B/zh active Active
- 2010-07-24 JP JP2012523199A patent/JP5575898B2/ja active Active
- 2010-07-24 WO PCT/DE2010/000867 patent/WO2011015178A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2011015178A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN102471959B (zh) | 2014-06-25 |
DE102009035904A1 (de) | 2011-02-10 |
JP5575898B2 (ja) | 2014-08-20 |
CN102471959A (zh) | 2012-05-23 |
JP2013501160A (ja) | 2013-01-10 |
EP2462268B1 (de) | 2015-01-21 |
WO2011015178A1 (de) | 2011-02-10 |
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