EP1163384A2 - Method for optimizing and monitoring weft insertion in power looms - Google Patents
Method for optimizing and monitoring weft insertion in power loomsInfo
- Publication number
- EP1163384A2 EP1163384A2 EP00922537A EP00922537A EP1163384A2 EP 1163384 A2 EP1163384 A2 EP 1163384A2 EP 00922537 A EP00922537 A EP 00922537A EP 00922537 A EP00922537 A EP 00922537A EP 1163384 A2 EP1163384 A2 EP 1163384A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- weft
- thread
- yarn
- weft insertion
- force
- 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
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03J—AUXILIARY WEAVING APPARATUS; WEAVERS' TOOLS; SHUTTLES
- D03J1/00—Auxiliary apparatus combined with or associated with looms
- D03J1/005—Displays or displaying data
-
- 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 weft insertion is determined by a permanently entered program and monitored with mechanical, capacitive, t ⁇ boelekt ⁇ schen or optoeiekt ⁇ schen thread watchers.
- mechanical, capacitive, t ⁇ boelekt ⁇ schen or optoeiekt ⁇ schen thread watchers To ensure a reliable response of the sensors to thread breakage, they have to react relatively slowly, that is means with a response time in the order of magnitude of 10 ms or more.
- the course of the thread movement during weft insertion from weft to weft can be determined at most approximately by measuring the response times of different sensors arranged in the thread path. A continuous measurement and monitoring of the thread movement during weft insertion is therefore impossible It is also not possible to optimize the course of the weft insertion, for example by specifically controlling the air nozzles in the air nozzle weaving machine.
- the measurement of the tensile force on the weft thread is occasionally carried out experimentally for scientific purposes.
- the sensors used use strain gauges as mechanical-electrical transducers
- the sensitivity, the overload capability and the limit frequency are limited by the materials used so that only carefully prepared laboratory measurements on individual weft insertion cycles can be carried out, and this only with particularly robust yarns that can withstand the additional stress caused by the deflection points of the sensor.
- the aim of the present invention is to use a cost-effective, robust, accurate and fast-reacting sensor to measure the thread force during the weft insertion and thus to better optimize and monitor the course of the weft insertion better and to monitor it more reliably than 45 degrees, preferably less than 30 degrees
- the limit frequency of the sensor is above 1 kHz, preferably above 5 kHz.
- This sensor is preferably implemented with a piezoresistive or piezoelectric crystal.
- a force sensor from Honeywell, type PK 88870 is used for this purpose This is used in conjunction with a DC voltage booster with a cutoff frequency of at least 1 kHz, preferably above 5 kHz.
- a force sensor from the Kistler range is used in conjunction with a charge booster In die In this case, a quasi-static output signal is generated by resetting the amplifier in the power-free phase of the entry cycle. The details of the piezoelectric measuring method are described in detail in the Kistler sales documentation
- FIG. 1 shows the schematic relationship of the means according to the method
- FIG. 2 shows the thread force signal
- FIG. 3 shows the procedure for monitoring the weft insertion
- FIG. 4 shows the principles for optimizing the weft insertion
- the principle of the measuring device is shown schematically in FIG. 1.
- the weft thread 1 is drawn off the bobbin 2 with the aid of the weft thread store 3. It then passes through a thread brake 4 and the thread force sensor 5 according to the invention.
- the force acting on the weft thread is measured in a known manner by deflecting the thread by converting the reaction force 7 of the thread from the pressure-sensitive element 6 into an electrical signal 13.
- the weft thread then passes through the so-called color selector, which ensures the assignment of different weft threads for the weft insertion.
- the thread in element 9 is accelerated and driven further This element has different shapes depending on the type of weaving machine.
- It can be a projectile or a gripper, or the main nozzle and the following relay nozzles of an air-jet weaving machine, or the injector of a water jet weaving machine.
- the force measuring element 6 can be built on a plate 5 provided with thread guides or can be integrated into the thread already present on the machine in such a way that the desired force component is generated on it. In any case, it is arranged in the thread path after the brake 4, but before entering the shed 11, at Air and water looms in front of the main nozzle 9
- the electrical signal 13 supplied by the thread force sensor 5 is electronically amplified in the evaluation unit 14, evaluated and sent as a signal 15 to a display 16 which informs the operator of the course of the weft insertion and draws his attention to faults and corrections thereto.
- the evaluation unit 14 stands for this via the data line 17 in connection with the machine control 19, from where it receives the time signals of further machine functions involved in the weft insertion, for example the current angular position of the main shaft of the machine.
- the machine control receives the monitoring signals of the thread force evaluation, for example, via the data line 18 for immediate stopping in the event of a thread break during weft insertion, or for activating a machine-related alarm means in the event of a malfunction that requires operator intervention
- the shape of the signal 13 is shown in its time course in FIG. 2 using the example of an air-jet weaving machine.
- the diagram shows the thread tension in the vertical axis 20, the time in section 22 in the horizontal axis 21, outside the actual weft insertion process, the thread is not under Train at time 23, the thread is accelerated and enters the shed.This leads to a rapid increase in the thread force. In time segment 24, the thread runs into the shed. At time 25, the length of the thread predetermined by the pre-cleaning unit 3 is stopped by this, resulting in a typical force peak. The thread remains selected afterwards. rend the time period 26 until at 27 the reed strikes the thread on the tissue and again generates a characteristic force peak. The thread is then cut on both sides by the scissors 10 and 12, the thread force disappears and the cycle begins again
- the force signal with interference-free weft insertion is shown analogously to FIG. 2.
- the monitoring of such a signal course over certain time periods is part of the known state of the art in digital signal processing, in analog form
- the signal supplied by the sensor is digitized in time intervals of at most 10 ms, preferably less than 1 ms, and compared with the limit values assigned to the relevant time step.
- These limit values can be entered by the user of the machine on the basis of yarn data or empirical values, or by Evaluation device itself can be determined during practical use according to the principle of adaptive control.
- a so-called teach-in by the operator is also provided.
- Schhesslich is also provided, based on the operating experience of the thread force for each n Time step to form the mean and thus define a pattern course.Each individual weft entry is compared with this pattern course, and if a specified tolerance is exceeded, an alarm is triggered or the machine is stopped.A decisive advantage is that the force curve leading to the stop is then used for diagnosis is available by the operator and can be compared with the image that the machine itself offers
- the limit values are, for example, the maximum tensile force 30 when the yarn is being drawn in. This tensile force is limited to a certain value due to the simultaneous acceleration of the game, which is generally lower than that when the game is stopped throughout A minimal thread force 31 is to be monitored in order to immediately recognize thread breaks. Finally, the peak load of the yarn when stopping 32 is to be monitored.
- This force peak is, on the other hand, a characteristic of the successfully implemented weft insertion, and is in turn also monitored with a minimum value 33 the timing, given by the position of the force peaks 23, 25 and 27, is to be monitored in an analog manner by the control system. This function is not shown here because it is handled in the same way as the monitoring of the arrival of the line in the area of the Scissors 12 (Fig 1) with an optical sensor
- the design of the method for optimizing the weft insertion is shown in FIG. 4.
- the thread force is shown in the vertical axis 20.
- the horizontal axis 40 is not divided here in time, but in sections 41 of the weaving cycle, which correspond to a certain number of degrees of angularity of the main shaft of the weaving machine the assignment of certain effects during weft insertion to the control functions of the weaving machine can be recognized.
- the normal force curve 42 is numerically determined by averaging a number of entry cycles and is shown in color on the screen (dotted here).
- Deviations of individual cycles that lead to the machine stopping are deviated from it particularly clearly identified.
- Automatic error diagnosis immediately indicates the type of error, as is already done in a simple manner with alphanumeric displays on the weaving machines, but only to a very limited extent, e.g. with the Differentiate between weft and warp defects
- the display draws attention to unfavorable setting values, for example excessive force peaks 45 in the area of the thread stopping.
- the arrow 46 clearly indicates the sensitive area, which is indicated by a changed setting is to be remedied, for example, by slowing down the weft insertion by reducing the pressure at the relay nozzles
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Looms (AREA)
- Auxiliary Weaving Apparatuses, Weavers' Tools, And Shuttles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH54199 | 1999-03-22 | ||
CH54199 | 1999-03-22 | ||
PCT/EP2000/002541 WO2000056964A2 (en) | 1999-03-22 | 2000-03-22 | Method for optimizing and monitoring weft insertion in power looms |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1163384A2 true EP1163384A2 (en) | 2001-12-19 |
EP1163384B1 EP1163384B1 (en) | 2003-09-10 |
Family
ID=4189385
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00922537A Expired - Lifetime EP1163384B1 (en) | 1999-03-22 | 2000-03-22 | Method for optimizing and monitoring weft insertion in power looms |
Country Status (8)
Country | Link |
---|---|
US (1) | US6467512B1 (en) |
EP (1) | EP1163384B1 (en) |
JP (1) | JP4546649B2 (en) |
KR (1) | KR100432266B1 (en) |
CN (1) | CN1108406C (en) |
AT (1) | ATE249539T1 (en) |
DE (1) | DE50003645D1 (en) |
WO (1) | WO2000056964A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005014456A1 (en) * | 2003-07-22 | 2005-02-17 | Iro Ab | Thread processing system and thread tensiometer |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE523442C2 (en) * | 2001-04-19 | 2004-04-20 | Eltex Sweden Ab | Ways to monitor thread |
BE1014133A3 (en) * | 2001-04-20 | 2003-05-06 | Picanol Nv | Method for optimizing a textile production and establishments to apply this procedure. |
NL1018600C2 (en) * | 2001-07-20 | 2003-01-21 | Te Strake Bv | Weaving machine. |
DE502005008310D1 (en) * | 2004-11-22 | 2009-11-26 | Itema Switzerland Ltd | Method for braking a weft thread of a loom |
DE502005007653D1 (en) * | 2004-11-22 | 2009-08-20 | Sultex Ag | Method for braking a weft thread of a jet loom |
EP2031106B1 (en) * | 2007-08-31 | 2010-02-24 | L.G.L. Electronics S.p.A. | Method for controlling the tension of the yarn unwinding from a negative yarn-feeder for textile machines, and apparatus for carrying out such method |
US8150543B2 (en) * | 2007-09-28 | 2012-04-03 | Siemens Aktiengesellschaft | Methods, apparatus and articles for an air jet loom |
DE102010026609B3 (en) * | 2010-07-09 | 2011-11-17 | Lindauer Dornier Gesellschaft Mit Beschränkter Haftung | Method and apparatus for weaving patterns on fabrics with added weft effects |
DE102010034969B3 (en) | 2010-08-20 | 2011-11-03 | Lindauer Dornier Gesellschaft Mit Beschränkter Haftung | Weaving and weaving machine for weaving patterns in fabrics with additional pattern effects |
CN102733048A (en) * | 2012-07-06 | 2012-10-17 | 常熟市天豪机械有限公司 | Alarm device used for correcting position of weft yarn tube of loom |
JP6283489B2 (en) * | 2013-02-27 | 2018-02-21 | 津田駒工業株式会社 | Information display method and information display apparatus for loom |
CN103558362A (en) * | 2013-10-30 | 2014-02-05 | 苏州龙杰特种纤维股份有限公司 | Industrial yarn detection method |
ITUB20155266A1 (en) * | 2015-10-30 | 2016-01-30 | Roj S R L | Pilot operated electromagnetic brake for checking the weft yarn tension in textile machines |
CN107400972B (en) * | 2017-07-12 | 2018-10-02 | 青岛高校百特创新科技发展有限公司 | A kind of air-jet loom system and its control method weaving different patterns |
IT201800006835A1 (en) * | 2018-06-29 | 2019-12-29 | OPTICAL DEVICE FOR DETECTION OF SHORT WEFT IN A TEXTILE FRAME | |
CN109750410B (en) * | 2019-03-08 | 2023-10-10 | 浙江宁巍机械科技有限公司 | Weft insertion system of water jet loom and debugging method thereof |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3688958A (en) | 1970-11-16 | 1972-09-05 | Rydborn S A O | Device for sensing thread passage to control machine operation |
IT1169113B (en) * | 1983-02-24 | 1987-05-27 | Tiziano Barea | DEVICE FOR CHECKING THE ADVANCE STATE OF A THREAD FEEDING TO A WEAVING MACHINE |
DE59510272D1 (en) * | 1995-05-24 | 2002-08-14 | Sulzer Textil Ag Rueti | Sensor and device with sensor for detecting a thread tension |
IT1283381B1 (en) * | 1996-07-31 | 1998-04-17 | Roj Electrotex Nuova Srl | PROCEDURE FOR CHECKING THE INSERTION OF THE WEFT THREAD IN A WEAVING LOOM. |
IT1310749B1 (en) * | 1999-11-30 | 2002-02-22 | Lgl Electronics Spa | METHOD AND CONTROL DEVICE FOR ELECTRIC WEFT BRAKES FOR THE AUTOMATIC ADJUSTMENT OF THE MECHANICAL TENSION OF THE |
-
2000
- 2000-03-22 US US09/937,368 patent/US6467512B1/en not_active Expired - Fee Related
- 2000-03-22 AT AT00922537T patent/ATE249539T1/en not_active IP Right Cessation
- 2000-03-22 EP EP00922537A patent/EP1163384B1/en not_active Expired - Lifetime
- 2000-03-22 CN CN00806466A patent/CN1108406C/en not_active Expired - Fee Related
- 2000-03-22 WO PCT/EP2000/002541 patent/WO2000056964A2/en active IP Right Grant
- 2000-03-22 KR KR10-2001-7012095A patent/KR100432266B1/en not_active IP Right Cessation
- 2000-03-22 JP JP2000606820A patent/JP4546649B2/en not_active Expired - Fee Related
- 2000-03-22 DE DE50003645T patent/DE50003645D1/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO0056964A2 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2005014456A1 (en) * | 2003-07-22 | 2005-02-17 | Iro Ab | Thread processing system and thread tensiometer |
Also Published As
Publication number | Publication date |
---|---|
WO2000056964A2 (en) | 2000-09-28 |
WO2000056964A3 (en) | 2000-12-28 |
CN1347468A (en) | 2002-05-01 |
JP4546649B2 (en) | 2010-09-15 |
EP1163384B1 (en) | 2003-09-10 |
ATE249539T1 (en) | 2003-09-15 |
US6467512B1 (en) | 2002-10-22 |
JP2002543297A (en) | 2002-12-17 |
KR20010108375A (en) | 2001-12-07 |
DE50003645D1 (en) | 2003-10-16 |
CN1108406C (en) | 2003-05-14 |
KR100432266B1 (en) | 2004-05-22 |
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