比利时专利BE1024795B1 METHOD FOR DETECTING FRAME WIRE AND FRAME WIRE DETECTION UNIT IN AN AIR JET TYPE WEAVING

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专利摘要:
A weft yarn detection unit is used in an air jet type loom including a main nozzle, secondary nozzles, and a weft brake. The air jet loom inserts a weft yarn using air jets emanating from the main nozzle and the secondary nozzles. The weft detection unit also includes a sensor which is placed in a position which precedes the position reached by the leading end of the weft yarn at the moment corresponding to the braking of the weft brake, a means of calculation which calculates the mean square deviation of the moments corresponding to the fact that the front end of the weft reaches a median position detected by the sensor, and a warning output means that sends a warning when the mean square deviation exceeds a threshold.
公开号:BE1024795B1
申请号:E2017/5428
申请日:2017-06-15
公开日:2018-07-10
发明作者:Yoichi Makino；Ryuji Arai
申请人:Kabushiki Kaisha Toyota Jidoshokki；
IPC主号:

专利说明:

(30) Priority data:
06/20/2016 JP 2016 121 841 (73) Holder (s):
KABUSHIKI KAISHATOYOTA JIDOSHOKKI
448-8671, AICHI-KEN
Japan (72) Inventor (s):
MAKINO Yoichi 448-8671 AICHI-KEN Japan
ARAI Ryuji 448-8671 AICHI-KEN Japan (54) METHOD FOR DETECTION OF WEFT YARN AND WEFT WIRE DETECTION UNIT IN AIR JET TYPE WEAVING MATERIAL (57) Weft wire detection unit is used in an air jet type loom including a main nozzle, secondary nozzles and a weft brake. The air jet type loom inserts a weft thread using air jets from the main nozzle and secondary nozzles. The weft yarn detection unit also includes a sensor which is placed in a position which precedes the position reached by the front end of the weft yarn at the time corresponding to the braking of the weft yarn brake, a calculation means which calculates the mean square deviation of the moments corresponding to the fact that the front end of the weft thread reaches a middle position which are detected by the sensor, and a warning output means which sends a warning when the mean square deviation exceeds a threshold.
BELGIAN INVENTION PATENT
FPS Economy, SMEs, Middle Classes & Energy
Publication number: 1024795 Deposit number: BE2017 / 5428
Intellectual Property Office International Classification: D03D 47/30 Date of issue: 07/10/2018
The Minister of the Economy,
Having regard to the Paris Convention of March 20, 1883 for the Protection of Industrial Property;
Considering the law of March 28, 1984 on patents for invention, article 22, for patent applications introduced before September 22, 2014;
Given Title 1 “Patents for invention” of Book XI of the Code of Economic Law, article XI.24, for patent applications introduced from September 22, 2014;
Having regard to the Royal Decree of 2 December 1986 relating to the request, the issue and the maintenance in force of invention patents, article 28;
Given the patent application received by the Intellectual Property Office on June 15, 2017.
Whereas for patent applications falling within the scope of Title 1, Book XI of the Code of Economic Law (hereinafter CDE), in accordance with article XI. 19, §4, paragraph 2, of the CDE, if the patent application has been the subject of a search report mentioning a lack of unity of invention within the meaning of the §ler of article XI.19 cited above and in the event that the applicant does not limit or file a divisional application in accordance with the results of the search report, the granted patent will be limited to the claims for which the search report has been drawn up.
Stopped :
First article. - It is issued to
KABUSHIKI KAISHA TOYOTA JIDOSHOKKI, 2-1 Toyoda-cho, Kariya-shi, 448-8671AICHI-KEN Japan;
represented by
VAN VARENBERG Patrick, Arenbergstraat 13, 2000, ANTWERPEN;
a Belgian invention patent with a duration of 20 years, subject to the payment of the annual fees referred to in article XI.48, §1 of the Code of Economic Law, for: PROCESS TO DETECT A WEFT AND UNIT OF DETECTION OF WEFT YARN IN AIR JET TYPE WEAVING.
INVENTOR (S):
MAKINO Yoichi, c / o Kabushiki Kaisha Toyota Jidoshokki, 2-1, Toyoda-cho, Kariya-shi, 448-8671, AICHI-KEN;
ARAI Ryuji, c / o Kabushiki Kaisha Toyota Jidoshokki, 2-1, Toyoda-cho, Kariya-shi, 448-8671, AICHI-KEN;
PRIORITY (S):
06/20/2016 JP 2016121841;
DIVISION:
divided from the basic application: filing date of the basic application:
Article 2. - This patent is granted without prior examination of the patentability of the invention, without guarantee of the merit of the invention or of the accuracy of the description thereof and at the risk and peril of the applicant (s) ( s).
Brussels, 07/10/2018, By special delegation:
BE2017 / 5428
METHOD FOR DETECTION OF WEFT YARN AND WEFT DETECTION UNIT IN AIR JET TYPE WEAVING MATERIAL
FOUNDATION OF THE INVENTION
The present invention relates to a method for detecting a weft yarn and a unit for detecting weft yarn in an air jet type loom and more particularly to a method for detecting a weft yarn and a unit for detecting a weft thread in a loom of the air jet type which includes a weft thread brake for applying braking to the weft thread at the end of the threading of the weft thread.
The fact that the weft yarns reach the predetermined end position for inserting the weft yarn at the predetermined time is crucial for improving the weaving quality of air-jet type looms. In this regard, display units have been proposed which display the conditions of insertion of the weft thread of the looms to facilitate understanding of the changes in
BE2017 / 5428 time series when the weft thread is in its running state. For example, in the publication of Japanese patent subject to public inspection No. 2009-215694, a unit is described which includes a weft feeler disposed in position adjacent to the end of the woven fabric which is opposite to the insertion side of the weft thread. The weft thread feeler faces the thread passage of the weft thread. The weft thread feeler includes a sensor arranged at the point where the weft thread which has been inserted under normal conditions arrives. The weft thread feeler determines whether the weft thread has been inserted under normal conditions based on changes in sensor output signals which are detected during the predetermined detection period. In the processing unit, a threshold which is used to send a warning is preset for at least one type respectively among four types of statistical values (a maximum value, a minimum value, a mean value and a mean square deviation). When the weaving loom is put into service, the processing unit compares the thresholds with the corresponding statistical values obtained by the statistical value determination means and sends a warning when any of the statistical values exceeds the corresponding threshold.
The threading of the weft thread in the air jet type loom ends when the extraction of the weft thread from the weft length measuring accumulator ends. When the extraction of the weft yarn stops, sudden braking is applied to the weft yarn which is flying at high speed, giving rise to an increase in the tension within the weft yarn. A sudden increase in tension can break the weft thread. For this reason, a weft thread brake (unit of
BE2017 / 5428 weft braking) is used to limit such an abrupt increase in tension by applying braking to the weft thread near the end of the insertion of the weft thread.
In FIGS. 7A to 8, the running curves of the weft thread are shown in a weaving loom of the air jet type with respect to different under pressures (that is to say the spray pressures of the nozzles secondary). In FIG. 7 A, a weft yarn running curve is detected when the underpressure rises to 500 kPa. In FIG. 7B, a weft thread running curve is detected when the underpressure rises to 320 kPa. In each of the examples of FIGS. 7A and 7B, the gradient of the running curve is essentially uniform in the first three quarters of the weaving width. However, the gradient clearly decreases in the last quarter of the weaving width. In Figure 8, we represent a weft thread running curve detected when the underpressure is 240 kPa. In this example, the gradient of the scroll curve is essentially uniform from start to finish in the longitudinal direction. The longitudinal position corresponding to the end of the first three quarters of the weaving width represents the position reached by the front end of the weft thread at the time corresponding to the braking of the weft thread brake.
In Figure 9, we represent the relationship between the underpressure and the mean square deviation TWc of the moments TW corresponding to the fact of reaching the final position. The moment TW corresponding to reaching the final position represents the moment at which the front end of the weft thread reaches the final position of insertion of the weft thread which is opposite to the main nozzle.
BE2017 / 5428
When the weft thread brake is not used, the mean square deviation TWc of the moments TW corresponding to reaching the final position decreases when the underpressure increases and increases when the underpressure decreases. On the other hand, when the weft brake is used, a lower underpressure reduces the mean square deviation TWc of the moments TW corresponding to the fact of reaching the final position, as shown in FIG. 9. Consequently, the The mean square deviation TWc of the moments TW corresponding to the fact of reaching the final position does not accurately reflect any change whatsoever in the running condition (slack) of the weft thread itself.
The following factors may be responsible for the phenomenon described above. When braking is applied to the weft yarn which is free from slack due to high underpressure, the front end of the weft yarn is extremely sensitive to braking, which tends to increase the mean square deviation TWc. When the underpressure is low, the weft thread is slackened when braking is applied, resulting in the front end of the weft thread being less sensitive to braking, which tends to reduce the quadratic deviation medium TWc.
As such, when the weft thread brake is used, the mean square deviation TWc of the moments TW corresponding to reaching the final position is not useful for sending an effective slack warning in the thread weft. In addition, the display unit for the step of inserting the weft thread of the loom described in the publication of the Japanese patent submitted to
BE2017 / 5428 public inspection n ° 2009-215694 is not configured to be used with a weft thread brake.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method for detecting a weft yarn and a unit for detecting weft yarn in an air jet type loom which sends an effective slack warning in the weft yarn in a configuration including a weft yarn brake.
To implement the object indicated above and in accordance with a first aspect of the present invention, a method is provided for the detection of a weft thread in an air jet type loom. The air jet type loom includes a main nozzle, a secondary nozzle and a weft brake, and in which the weft thread is inserted using air jets from the main nozzle and of the secondary nozzle. The method includes: placing a sensor in a position that precedes a position reached by a front end of the weft yarn at a time corresponding to the braking of the weft yarn brake; calculating the mean square deviation of the moments corresponding to the fact that the front end of the weft thread reaches a middle position, which are detected by the sensor; and send a warning when the mean square deviation exceeds a threshold.
To implement the object indicated above and in accordance with a second aspect of the present invention, a weft detection unit is provided in an air jet type loom. Air jet type loom includes a nozzle
BE2017 / 5428 main, a secondary nozzle and a weft thread brake, and in which the weft thread is inserted using air jets from the main nozzle and the secondary nozzle. The weft yarn detection unit includes a sensor placed in a position which precedes a position reached by a front end of the weft yarn at a time corresponding to the braking of the weft yarn brake; a calculating means which calculates the mean square deviation of the moments when the front end of the weft thread reaches a middle position, which are detected by the sensor, and a warning sending means which sends a warning when the mean square deviation exceeds a threshold.
Other aspects and other advantages of the present invention will emerge from the following description, when taken in conjunction with the accompanying drawings which illustrate by way of example the principles of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention, in conjunction with its objects and advantages, can be best understood by referring to the following description of the preferred embodiments at present in conjunction with the accompanying drawings in which:
Figure 1 is a schematic view showing the structure of a weft thread insertion system of an air jet type loom;
FIG. 2A is a schematic view in which there is shown an adjustment screen under normal conditions;
FIG. 2B is a schematic view in which there is shown an adjustment screen under abnormal conditions;
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Ια Figure 3 is a graph in which we represent the running curves of the weft thread;
FIG. 4 is a graph in which the relationship of the underpressures is shown with the mean square deviations of the moments corresponding to reaching the final position and the mean square deviation of the moments corresponding to reaching a median position;
FIGS. 5A to 5C are explanatory schematic views in which the way in which a weft thread becomes soft is shown; FIGS. 6A to 6C are explanatory schematic views in which the way in which a weft thread becomes soft is shown; FIGS. 7A and 7B are graphs in which the running curves of the weft thread are shown;
FIG. 8 is a graph in which a curve of the running of the weft thread is shown; and Figure 9 is a graph showing the relationship between the underpressures and the mean square deviation of the moments corresponding to reaching the final position.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
An embodiment of the present invention will now be described with reference to Figures 1 to 6C.
As shown in Figure 1, a weft thread insertion system 10 of an air jet type loom includes a weft thread accumulator 11, a main nozzle 12, a tandem nozzle 13 which is arranged on the upstream side of the main nozzle 12, several groups of secondary nozzles 14A to 14F which are arranged on the downstream side of the main nozzle 12, and a ros 15. The ros
BE2017 / 5428 includes lines of teeth which include guide recesses and which are arranged in the direction of insertion of the weft thread. The tandem nozzle 13 includes a weft thread brake 16. The groups of secondary nozzles 14A to 14F each include four secondary groups 14.
A weft yarn is fed from a weft cheese 17 which acts as a wire feeding portion, wound around a length measuring drum 19 and stored in the weft accumulator 11. The weft yarn accumulator 11 includes a contact pin 20a which is driven by an electromagnetic solenoid to move towards and away from the length measuring drum 19. The contacting and spacing between the contact pin 20a and the length measuring drum 19 control the extraction of the weft yarn Y from the length measuring drum 19. The length measuring drum 19 includes a photoelectric balloon sensor 21 which detects a balloon of the weft yarn extracted from the length measuring drum 19. The balloon sensor 21 detects a balloon during the insertion of the weft yarn.
An air source 22 is connected to a main tank 25 via a pipe 23 and a regulator 24. The main tank 25 is connected to the main nozzle 12 via the pipe 23 and a main valve 26. The main tank 25 is also connected to the tandem nozzle 13 via line 23 and a tandem valve 27. The air source 22 is connected to a secondary tank 29 via line 23 and a regulator 28. A controller C controls the main valve 26 and the tandem valve 27 to set the time corresponding to the discharge of
BE2017 / 5428 compressed air from the main nozzle 12 and the tandem nozzle 13. The air source 22 may include an air compressor, for example.
The secondary tank 29 includes several secondary valves 30 each connected to one of the corresponding groups among the groups of secondary nozzles 14A to 14F via the pipe 23. When each secondary valve 30 opens, the secondary nozzles 14 of the corresponding group among the groups of secondary nozzles 14A to 14F simultaneously discharge jets of compressed air. During the insertion of the weft thread, the controller controls the secondary valves 30 to open and close the groups of secondary nozzles 14A to 14F at a predetermined time in the manner of a relay, thereby discharging jets of compressed air. from the groups of secondary nozzles 14A to 14F.
A weft thread feeler 31 is disposed in the final weft thread insertion position which is situated on the side of the ros 15 which is opposite to the main nozzle. The weft yarn feeler 31 acts as a photoelectric weft yarn detector to detect the reaching of the weft yarn Y. The weft yarn feeler 31 detects the end of the weft yarn Y upon completion of the insertion of each pick. The weft feeler 31 sends a pulse signal when it detects weft Y.
The ros 15 includes a sensor 32 within the weaving width. The sensor 32 is placed between the center of the weaving width and the position reached by the front end of the weft thread at the time corresponding to the braking of the weft thread brake 16. The sensor
BE2017 / 5428 is further from the main nozzle 12 than the center of the weaving width. For example, the sensor 32 can be placed in a position which directly precedes the position reached by the front end of the weft thread at the time corresponding to braking. More specifically, the sensor 32 is placed in a position which is located a few centimeters away from the main nozzle 12 relative to the position reached by the front end of the weft thread at the time corresponding to braking. The sensor 32 includes a weft yarn photoelectric detector. The position reached by the front end of the weft thread at the time corresponding to the braking of the weft thread brake 16 can be determined from the average running curve of the weft thread.
Controller C includes a CPU 35 and a memory 36. Controller C regulates the pressure of the main reservoir 25 via regulator 24 and regulates the pressure of secondary reservoir 29 via regulator 28. Controller C controls the opening and closing of the main valve 26 and the tandem valve 27 for adjusting the moments corresponding to the discharge of the compressed air jets from the main nozzle 12 and the tandem nozzle 13. The controller C also controls the opening and closing of the secondary valves 30 for controlling the relay discharge of the groups of secondary nozzles 14A to 14F.
Controller C acts as a weft yarn detection unit. Upon detection of a weft thread, the sensor 32 sends a pulse output signal. The pulse output signal is entered into controller C which records the input time of the pulse output signal. More specifically, the CPU 35 uses the angles of the trade
BE2017 / 5428 for weaving in which the pulses have entered the detection range of the weft yarn in the form of pulse occurrence angles and generates a sequence of pulse occurrence angles. The memory 36 stores this sequence of angles of pulse occurrences. Upon detection of the weft yarn, the sensor 32 sends a pulse output signal. The pulse output signal is entered into the controller C which records a TL moment corresponding to the fact that the front end of the weft thread reaches a middle position. The moment TL corresponding to reaching a middle position represents the moment at which the pulse output signal is input. Based on several weft thread inserts detected by the sensor 32, that is to say on the moments TL corresponding to the fact that the front ends of several picks reach a median position, the CPU 35 calculates the mean square deviation TLc moments TL corresponding to the fact that the front end of the weft thread reaches a middle position. In other words, the CPU 35 acts as a calculation means which calculates the mean square deviation TLc of the moments TL corresponding to the fact that the front ends reach a median position. The CPU 35 also calculates the moments TW corresponding to the fact of reaching the final position and the mean squared difference TWc of the moments TW corresponding to the fact of reaching the final position based on detection signals emanating from the thread tracer. frame 31.
The controller is connected to a control panel 40 which acts as an input / output unit. The control panel 40 includes input keys (not shown) and a display screen 41. The display screen 41 displays an adjustment screen 42 which is shown in FIG. 2.
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As shown in FIGS. 2A and 2B, the adjustment screen 42 includes a section for displaying the limit of the value ΤΙ_σ 44, a section for displaying the limit for the value TL 45, a section for displaying the the stop determination value 46 and a section for displaying the limit of the value TW 47. The section for displaying the limit for the value TLc 44 indicates the upper limit of the mean square deviation TLc. The TL value limit display section indicates the upper limit of the TL moment corresponding to the fact that the front end of the weft thread reaches a middle position. The stop determination display section 46 indicates the value by which the controller C determines whether or not to stop the loom. When the number of times picks which are abnormally delayed reach the indicated value, the controller C determines the stopping of the loom. The value 2/10 represented in FIGS. 2A and 2B indicates that the loom will be stopped when two picks out of ten are delayed beyond the limit TW of the moment TW corresponding to the fact of reaching the final position. The TLc value limit display section 44, the TL value limit display section 45, the stop determination value display section 46 and the display value section the limit of the value TW 47 each display a value which is adjusted according to the weaving conditions.
As shown in Figures 2A and 2B, the setting screen 42 includes a warning / stop display section 48. The warning / stop display section 48 displays a "warning" or a "stop " The display section
BE2017 / 5428 warning / stop 48 can indicate a warning when TL time corresponding to reaching a middle position exceeds the value indicated in the TL 45 limit display section, when the mean square deviation TLc exceeds the value indicated in the value limit display section TLc 44, or when the moment TW corresponding to reaching the final position exceeds the value indicated in the value limit display section TW 47. In other words, the warning / stop display section 48 acts as a warning output means which indicates a warning when the mean square deviation TLc calculated by the CPU 35 exceeds the threshold which represents the value indicated in the TLc 44 limit display section. While displaying a warning, the warning / stop display section 48 indicates a "stop" when the number of times d esites which are abnormally delayed reaches the value indicated in the display section of the stop determination value 46.
The weft yarn detection unit of the present invention therefore includes the sensor 32, the computing means (the CPU 35) and the warning output means (the warning / off display section 48) . The CPU 35 calculates the mean square deviation TLc of the moments TL corresponding to the fact that the front end of the weft thread reaches a middle position, which are detected by the sensor 32. The warning / stop display section 48 sends a warning when the mean square deviation TLc calculated by the calculation means exceeds the threshold.
BE2017 / 5428
As shown in FIG. 2A, the section for displaying the limit of the value ΤΙ_σ 44, the section for displaying the limit for the value TL 45, the section for displaying the stop determination value 46 and the TW value limit display section 47 display values which are appropriate for the weaving conditions. The operator enters these values when the setting screen 42 is displayed in the display screen 41 of the control panel 40. For example, as shown in FIGS. 2A and 2B, the limit TLc is equal to 2 , 00, the TL limit is equal to 220, the stop determination value is equal to 2/10 and the TW limit is equal to 260. While the air jet type loom is set to l When stopped, the TL 49 value display section, the TLc 50 value display section, the TW value display section and the TWc 52 value display section indicate 0.
During the commissioning of the air-jet type loom, the controller C calculates the moments TL corresponding to reaching a median position and the mean square deviation TLc based on detection signals sent by the sensor 32. The TL 49 value display section and the TLc 50 value display section indicate the results of the calculation. Controller C can calculate the moments TL corresponding to reaching a median position and the mean square deviation TLc by collecting sampling data of 1000 continuous picks, for example.
In FIG. 2A, the section for displaying the value of TL 49 and the section for displaying the value TLc 50 showing the results of the calculation are shown. The moment TL corresponding to reaching a median position and the mean square deviation TLc are both
BE2017 / 5428 below the limits which are represented in FIG. 2A. As a result, controller C does not send a warning. The warning / stop display section 48 does not indicate a "warning" or "stop".
The warning / stop display section 48 in the setting screen 42 allows the operator to verify whether an appropriate insertion of the weft thread is being carried out under the conditions imposed. That is, the operator determines whether an appropriate insertion of the weft thread is implemented under the conditions imposed when the warning / stop display section 48 does not indicate a "warning Or a "stop", as shown in Figure 2A.
As shown in FIG. 2B, a certain factor can decrease the underpressure by causing the value of the mean square deviation TLc indicated in the display section of the value TLc 50 to increase compared to the value indicated in the TLc value limit display section 44, which results in the warning / stop display section 48 indicating a "warning".
The marks · in FIG. 3 indicate the running state of the weft thread under such conditions. The underpressure amounts to 240 kPa. If the insertion of the weft thread continues in this state, a certain number of picks will be abnormally delayed. The * marks indicate the running curve of the weft thread under such conditions.
BE2017 / 5428
When Ια warning / stop display section 48 indicates a "warning" as shown in FIG. 2B, an insertion of the weft thread can be implemented with at least one value chosen from the moment TL corresponding to the fact d '' reach a median position and the mean square deviation TLc which exceeds the limits imposed. In the situation which is represented in FIG. 2B, the moment TL corresponding to the fact of reaching a median position is less than the limit of the value TL and the mean quadratic deviation TLc is greater than the limit of the value TLc.
Thus, the operator recognizes that the mean square deviation TLc of the moments TL corresponding to the fact of reaching a median position is greater than the limit of the value TLc, which makes it possible to carry out an appropriate correction by comparison with a configuration which does not clearly indicate which value is chosen from the moment TL corresponding to reaching a median position and the mean square deviation TLc which exceeds the limit.
Controller C stops the loom when, while the warning / stop display section 48 indicates a warning, a number of picks are abnormally delayed and have scrolling curves similar to that shown in Figure 3 with the marks * and two picks out of 10 which are delayed beyond the limit of the moment TW corresponding to the fact of reaching the final position.
Referring now to Figures 5A to 6C, the mechanism of the weft yarn is explained. In FIGS. 5A to 5C, a normal insertion of weft thread (ordinary) is shown. In FIGS. 6A to 6C, an insertion of weft yarn is shown in the presence of slack.
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As shown in FIG. 5A, after the insertion of the weft thread has started and when the angle of the loom is approximately 192 °, the weft thread Y has a slight slack on the left side as can see it in Figure 5A. At this time, the sensor 32 detects the front end of the weft thread Y.
As can be seen in FIG. 5B, the slack is taken up while the weft yarn passes between the position represented in FIG. 5A and the position corresponding to an angle of the loom of 240 °, where the feeler of the weft 31 detects the weft yarn Y. The weft yarn Y then scrolls towards an edge zone As in this state.
As shown in FIG. 5C, the warp threads begin to retain the weft thread Y when the angle formed by the loom rises to approximately 280 °. Then, the weft thread Y is packed and intertwined with the warp threads to obtain a fabric.
As shown in Figure 6A, a decrease in underpressure reduces the transfer performance of the secondary nozzle system. Thus, the moment TL corresponding to the fact of reaching a middle position, at which the front end of the weft thread Y reaches the sensor 32, is delayed when compared with normal conditions. In addition, the weft yarn Y has a slight slack on the weft yarn insertion side (the LH side) when the angle formed by the loom is about 220 °.
As shown in FIG. 6B, the weft thread feeler 31 detects the front end of the weft thread Y when the angle formed by the loom rises to 265 °. The TW moment corresponding to
BE2017 / 5428 reaching the final position is delayed when compared to normal conditions. In addition, the slack in the weft yarn on the LH side is still present at this time.
As shown in FIG. 6C, when the angle formed by the loom rises to 280 °, the edge of the weft thread Y is not completely maintained and the weft thread Y always has a slight slack in the LH side. However, the weft thread Y is packed in this state.
Referring now to FIG. 4, the relationship between the underpressure and the mean square deviation TLc of the moments TL corresponding to the fact of reaching a median position in a loom in which a brake is used is described. weft thread.
As shown in FIG. 4, a higher underpressure increases the mean square deviation TWc of the moments TW corresponding to the fact of reaching the final position. The reason is that the front end of a weft thread which is free of slack due to high underpressure is very sensitive to the applied braking. This characteristic tends to increase the mean square deviation TWc.
On the other hand, the moment of detection of the sensor 32, which is arranged in a position which precedes the position reached by the front end of the weft thread at the time corresponding to the braking of the weft thread brake 16, purely reflects the transfer performance of the secondary nozzle system. Thus, even when the loom includes the weft thread brake 16, a lower underpressure increases the mean square deviation
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ΤΙ_σ moments TL corresponding to the fact of reaching a median position. Any decrease in the underpressure is thus detected with respect to the mean square deviation TLc of the moments TL corresponding to the fact of reaching a median position.
The calculation of the mean square deviation TLc from the moments TL corresponding to the fact of reaching a median position, detected by the sensor 32 makes it possible to use the mean square deviation TLc in determining whether weft Y has slack. As such, even when the loom includes the weft brake 16, the presence or abnormal absence of lateral slack in the weft Y can be determined.
The present embodiment achieves the advantages indicated below.
(1) The method for detecting a weft thread is used in the air jet type loom including the main nozzle 12, the secondary nozzles 14 and the weft wire brake 16. The loom of the type jet jet inserts the weft yarn using air jets from the main nozzle 12 and secondary nozzles 14. This method places the sensor 32 in a position which precedes the position reached by the front end of weft yarn at the time corresponding to the braking of the weft yarn brake and calculates the mean square deviation TLc of the moments TL corresponding to the fact that the front end of weft yarn reaches a median position, which are detected by the sensor 32. A warning is sent when the mean square deviation TLc exceeds the threshold. The method provides an effective warning of slack in the yarn.
BE2017 / 5428 weft Y in the air jet type loom which includes the weft thread brake 16.
(2) The sensor 32 is located further from the main nozzle 12 than the center of the weaving width. In the method described above, the sensor 32 can be placed in any position which precedes the position reached by the front end of the weft thread at the time corresponding to the braking of the weft thread brake 16. However, when the sensor 32 is closer to the main nozzle 12 than the center of the weaving width, the moment of detection of the sensor 32 may be too early to sufficiently reflect any change caused by the presence of slack in the weft thread Y. Consequently, the mean square deviation TLc will be less useful for detecting the presence of slack. On the other hand, when the sensor 32 is located farther from the main nozzle 12 than the center of the weaving width, the sensor 32 is closer to the place reached by the front end of the weft thread at the time corresponding to braking , which facilitates the detection of slack in the weft yarn based on the mean square deviation TLc.
(3) With a process that only sends a warning of the presence of slack in the weft yarn Y, the loom will not be stopped before the operator confirms the presence of slack in the yarn. weft Y and its determination of whether to stop the loom, which may give rise to a delay in the stopping of the loom. In this regard, the present embodiment stops the loom when, after sending a warning, the delay frequency of
BE2017 / 5428 the front end of the weft thread to reach the final weft thread insertion position exceeds the preset frequency, which avoids a delay concerning the stopping of the loom which would be elsewhere due to inattention on the part of the operator.
(4) The weft yarn detection unit is used in the air jet type loom including the main nozzle 12, the secondary nozzles 14 and the weft yarn brake 16. The loom of the air jet type inserts the weft yarn using air jets from the main nozzle 12 and secondary nozzles 14. The weft yarn detection unit also includes the sensor 32 which is placed in a position which precedes the position reached by the front end of the weft thread at the time corresponding to the braking of the weft thread brake 16, the calculation means (the CPU 35) which calculates the mean square deviation TLc of the moments TL corresponding to the causes the front end of the weft thread to reach a middle position, which is detected by the sensor 32, and the warning output means (the warning / stop display section 48) which sends a warning when the '' mean square deviation TLc calculated by means of calculation exceeds the threshold. Such a structure makes it possible to implement the method for detecting a weft thread, which is described in advantage (1). Thus, the structure provides an effective warning in the presence of slack in the weft yarn Y in the air jet type loom which includes the weft yarn brake 16.
The embodiment illustrated above can be changed as follows.
BE2017 / 5428
The sensor 32 can be placed at any point reached by the front end of the weft thread before the moment corresponding to the braking of the weft thread brake 16. In other words, the sensor 32 does not necessarily have to be placed in a position further from the main nozzle 12 than the center of the weaving width. However, placing the sensor 32 in a position further from the main nozzle 12 than the center of the weaving width increases the correlation between the presence of slack in the weft thread and the variance in the mean square deviation TLc calculated by CPU 35.
The memory 36 of the controller C stores the limit of the value TLa, the limit of the value TL, the value for determining the stopping, and the limit of the value TW, which are preset in accordance with the weaving conditions. However, these values can be adjusted automatically by the controller C, which eliminates the need for the operator to modify the limit of the TLc value, the limit of the TL value, the stop determination value, and the limit of the TW value for each change that occurs in the weaving conditions.
The sampling data which must be collected to enable the controller C to calculate the mean square deviation TLc is not limited to the data linked to 1000 continuous frame picks and can be modified as required.
The warning / off display section 48 may include a light emitting diode or lamp for warning and a light emitting diode or lamp for shutting down the loom. In this case, the light emitting diode or the
BE2017 / 5428 warning lamp lights up to indicate a warning and the light-emitting diode or lamp for switching off lights up to indicate a stop.
Provided that the warning output means has the function of sending a warning when the mean square deviation ΤΙ_σ exceeds the threshold, the warning output means does not have the function of indicating a stop.
The tandem nozzle 13 can be omitted.
BE2017 / 5428

权利要求:
Claims (7)
[1]
1. Method for detecting a weft thread in an air jet type loom which includes a main nozzle, a secondary nozzle and a weft brake, and in which the weft thread is inserted using air jets emanating from the main nozzle and the secondary nozzle, the method comprising the fact of:
placing a sensor in a position which precedes the position reached by a front end of the weft thread at a time corresponding to the braking of the weft thread brake;
calculate the mean square deviation of the moments corresponding to the fact that the front end of the weft thread reaches a middle position, which are detected by the sensor; and send a warning when the mean square deviation exceeds a threshold.
[2]
2. Method for detecting a weft thread in an air jet type loom according to claim 1, in which the sensor is placed in a position farther from the main nozzle than a center of the weaving width .
[3]
3. A method for detecting a weft thread in an air jet type loom according to claim 1 or 2, further comprising, after sending the warning, stopping the loom to weave when the delay frequency of the front weft end to reach a final weft insertion position exceeds a preset frequency.
[4]
4. Weft yarn detection unit weft yarn in an air jet type loom which includes a main nozzle,
BE2017 / 5428 a secondary nozzle and a weft brake, and into which the weft thread is inserted using air jets from the main nozzle and the secondary nozzle, the weft detection unit including:
[5]
5 a sensor placed in a position which precedes the position reached by a front end of the weft thread at a time corresponding to the braking of the weft thread brake;
a calculation means which calculates the mean square deviation of the moments corresponding to the fact that the front end of the wire
[6]
10 frame reaches a middle position, which are detected by the sensor; and a warning output means which sends a warning when the mean square deviation exceeds a threshold.
BE2017 / 5428
TJ
BE2017 / 5428
W 0T> _5t Tfe 3T23T-52 Value limit L.g6.0 ..... î-47 Warning / Arrested ........................ h-48 HE n sa. 41-- 49 TLs 1.39 ksa L i rrrite of the value 11.4 27001-44 Value limit) L 220 S4S Determination of the judgment 2 / WK-48
Z i C
Limit die value]
Warn / arfet
TL
260 h-4 7 SïïhZb-48
201, 5 bLi mrte of the value ïti Limit of the value TL
Determination of the judgment
O / 1 it ·,. /:
BE2017 / 5428
S
ÏL TL (Quite abnormally delayed
00 100 120 140 WO 100 2ÜÛ 220 240 B0 280 300 320
Angle formed by the weaving measure (’) average <*)
READ
250
400
450
TLff
BE2017 / 5428
BE2017 / 5428
BE2017 / 5428
Ange formed by the loom to weave (*}
BE2017 / 5428
Average quadratic deviation f)
Subpressures (kPa)
BE2017 / 5428
METHOD FOR DETECTION OF WEFT YARN AND WEFT DETECTION UNIT IN AIR JET TYPE WEAVING MATERIAL
A weft yarn detection unit is used in an air jet type loom including a main nozzle, secondary nozzles and a weft brake. The air jet type loom inserts a weft thread using air jets
10 emanating from the main nozzle and the secondary nozzles. The weft yarn detection unit also includes a sensor which is placed in a position which precedes the position reached by the front end of the weft yarn at the time corresponding to the braking of the weft yarn brake, a calculation means which calculated
[7]
15 the mean square deviation of the moments corresponding to the fact that the front end of the weft thread reaches a middle position which are detected by the sensor, and a warning output means which sends a warning when the mean square deviation exceeds a threshold.

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同族专利:

公开号 | 公开日

JP2017226926A|2017-12-28|

CN107523926A|2017-12-29|

CN107523926B|2019-11-22|

BE1024795A1|2018-07-02|

JP6447582B2|2019-01-09|

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法律状态:
2018-08-31| FG| Patent granted|Effective date: 20180710 |

优先权:

申请号 | 申请日 | 专利标题

JP2016121841|2016-06-20|

JP2016121841A|JP6447582B2|2016-06-20|2016-06-20|Weft detection method and weft detection device for air jet loom|

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