BE1024390B1 - Method for controlling a weft insertion and weft insertion controller in an air jet type loom - Google Patents

Abstract

A method for controlling insertion of weft yarn into a loom including a main nozzle and a secondary nozzle and inserting a weft yarn by using an air jet from the main nozzle and the secondary nozzle, the method comprising: detecting a condition of the weft yarn before insertion; execute an advanced feed control that increases a quantity of air jet from the main nozzle when a time corresponding to the arrival of the predicted weft yarn from the state of the weft yarn, which is detected , is delayed with respect to a delay threshold; and delaying a target timing corresponding to the arrival of the weft yarn in a range in which the advanced feed control can maintain the timing corresponding to the arrival of the advanced weft yarn with respect to the delay threshold.

Description

(30) Priority data:

02/19/2016 JP 2016-029860 (73) Holder (s):

KABUSHIKI KAISHATOYOTA JIDOSHOKKI

448-8671, AICHI-KEN

Japan (72) Inventor (s):

MAKINO Yoichi 448-8671 AICHI-KEN Japan (54) Method for controlling an insertion of weft yarn and controller for inserting weft yarn in an air jet type loom (57) Method for controlling an insertion of weft yarn in a loom including a main nozzle and a secondary nozzle and which inserts a weft yarn using an air jet from the main nozzle and the secondary nozzle, the method comprising: detecting a state of the weft thread before insertion; execute an advanced feed control which increases an amount of air jet from the main nozzle when a time corresponding to the arrival of the weft thread predicted from the state of the weft thread, which is detected , is delayed with respect to a delay threshold;

Fig .1 »

and delaying a target moment corresponding to the arrival of the weft yarn in a range in which the advanced feed control can maintain the moment corresponding to the arrival of the weft yarn relative to the delay threshold.

BELGIAN INVENTION PATENT

FPS Economy, SMEs, Middle Classes & Energy

Publication number: 1024390 Deposit number: BE2017 / 5081

Intellectual Property Office International Classification: D03D 47/30 Date of issue: 02/13/2018

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;

Considering the patent application received by the Intellectual Property Office on 08/02/2017.

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 payment of the annual fees referred to in article XI.48, §1 of the Code of Economic Law, for: Process for controlling the insertion of a weft thread and weft thread insertion controller in an air jet type loom.

INVENTOR (S):

MAKINO Yoichi, c / o Kabushiki Kaisha Toyota Jidoshokki, 2-1, Toyoda-cho, Kariya-shi, 448-8671, AICHI-KEN;

PRIORITY (S):

02/19/2016 JP 2016-029860;

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, 02/13/2018, By special delegation:

BE2017 / 5081

METHOD FOR CONTROLLING WEFT THREAD INSERTION AND WEFT THREAD INSERTION CONTROLLER IN AIR JET TYPE WEAVING

FOUNDATION OF THE INVENTION

The present invention relates to a method for controlling the insertion of a weft thread and a controller for the insertion of a weft thread in an air jet type loom which inserts a weft thread. using an air jet from a main nozzle and secondary nozzles.

An air jet type loom has a weft thread insertion system which uses compressed air to insert the weft thread. The amount of use of compressed air directly affects the energy consumption of weaving plants. In the publication of the Japanese patent in the national phase subject to public inspection No. 2014-500914, for example, there is described a controller for the insertion of the weft thread in an air jet type loom, which reduces the energy and compressed air consumption of the air jet type loom and which increases the productivity of the air jet type loom. This weft thread insertion controller calculates the expected amount of time

BE2017 / 5081 corresponding to the arrival of the weft thread from the parameters of the weft thread which are measured by sensors. The controller then compares the expected time corresponding to the arrival of the weft yarn with the time corresponding to the arrival of the weft yarn, as measured by the weft breaker device (corresponding target moment at the arrival of the weft yarn relative to the weft breaker type device). When the expected time corresponding to the arrival of the weft yarn is shorter than the measured time corresponding to the arrival of the weft yarn, the controller shortens the time corresponding to the opening of the nozzle for reduce the consumption of compressed air. Otherwise, the controller slightly extends the time corresponding to the opening of the nozzle to prevent the risk of immobilization of the loom.

The flight characteristics can vary even under the same conditions of insertion of the weft thread. This is how the moments corresponding to the arrivals of the fi! of weft form a normal distribution, the average of which represents the target moment corresponding to the arrival of the weft thread TWm as shown in FIG. 6. The controller for the insertion of weft thread of the publication '914 shortens the period of time corresponding to the opening of the nozzle in order to reduce the consumption of compressed air when the expected time corresponding to the arrival of the fi! weft is advanced relative to the target moment corresponding to the arrival of the weft thread TWm. In addition, when the expected time corresponding to the weft yarn arrival is delayed compared to the target moment corresponding to the arrival of the weft yarn TWm, which occurs as much as the moment

BE2017 / 5081 expected corresponding to the arrival of the weft thread is advanced compared to the target moment corresponding to the arrival of the weft thread TWm, the controller extends the time corresponding to the opening of the nozzle, which eliminates reducing the consumption of compressed air.

In document WO 20120686, a method and an apparatus for controlling a weaving loom are described. The weaving loom contains several relay nozzles arranged along a fluid supply duct. First, a weft thread is introduced into the fluid supply conduit. Second, the relay nozzles are activated to eject time-spaced fluid pulses which produce a flow of fluid in the fluid supply line. Finally, the weft yarn is transported by the fluid stream through the fluid supply conduit. In addition, at least two different individual intrinsic characteristics of a section of weft yarn which is to be introduced into the fluid supply duct are determined. The relay nozzles are activated on the basis of the two different individual intrinsic characteristics determined beforehand, of the section of weft yarn respectively transported. Thus, the energy and air consumption of the loom are reduced and the productivity of the loom is increased.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a method for controlling the insertion of the weft yarn and a controller for the insertion of the weft yarn in an air jet type loom which reduces the consumption of compressed air from the air jet type loom without increasing the number of missing picks.

BE2017 / 5081

To achieve the above object and in accordance with a first aspect of the present invention, there is provided a method for controlling the insertion of the weft yarn in an air jet type loom. The air jet type loom includes a main nozzle for the insertion of the weft yarn and a secondary nozzle for the insertion of the weft yarn and inserts a weft yarn using an air jet from of the main nozzle and the secondary nozzle. The method comprises: detecting a state of the weft thread before insertion with a detector of the state of the weft thread; execute an advanced supply control which increases an amount of air jet from the main nozzle when the time corresponding to the arrival of the weft thread which is predicted from the state of the weft thread, which is detected with the weft thread state detector, is delayed relative to a delay threshold; and delaying a target moment corresponding to the arrival of the weft yarn in a range in which the advanced feed control can keep the moment corresponding to the arrival of the weft yarn ahead of the delay threshold.

In order to achieve the above object and in accordance with a second aspect of the present invention, there is provided a controller for the insertion of the weft thread in an air jet type loom. The air jet type loom includes a main nozzle for inserting the weft thread and a secondary nozzle for inserting the weft thread, inserts a weft thread using an air jet from of the main nozzle and the secondary nozzle, detects a state of the weft thread before insertion with a detector of the state of the weft thread, and executes an advanced supply control which increases an amount of air jet from the main nozzle when a moment corresponding to

BE2017 / 5081 the arrival of the weft thread, predicted from the detected state of the weft thread, is delayed with respect to a delay threshold. The weft thread insertion controller includes an adjustment unit, a control unit for changing the value of the advanced feed control and a control unit for changing the target moment corresponding to the arrival of the fi! weft. The setting unit sets a target moment corresponding to the arrival of the weft thread, the time delay threshold corresponding to the arrival of the weft thread and an advanced feed control value. The control unit for changing the advanced power control value changes the advanced power control value based on a comparison between the delay threshold and a most delayed time corresponding to the arrival of the lead wire. weft, which is the most delayed in the insertion of the weft thread used under conditions adjusted with the adjustment unit. The control unit for changing the target moment corresponding to the arrival of the weft delay the target moment corresponding to the arrival of the fi! weft in a range in which the advanced feed control can maintain the most delayed moment corresponding to the arrival of the advanced weft yarn relative to the delay threshold.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic view showing the structure of a weft thread insertion system;

Figure 2 is a schematic view in which there is shown an adjustment screen;

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Ια Figure 3 is a schematic view in which a process control screen is shown;

Figure 4 is a schematic view in which there is shown an adjustment screen;

Figure 5 is a schematic view in which there is shown a process control screen;

Figure 6 is a schematic view showing the profile of the present invention;

Figure 7 is a schematic view showing the profile of the present invention;

Figure 8 is a schematic view showing the profile of the present invention;

Figure 9 is a flow chart for setting a target moment corresponding to the arrival of the weft thread;

FIG. 10A is a schematic view in which the adjustment screen is shown at the start of the first step;

FIG. 10B is a schematic view in which the adjustment screen is shown during the first step;

FIG. 10C is a schematic view in which the adjustment screen is shown at the end of the first step;

FIG. 11A is a schematic view in which the adjustment screen is shown during the second step;

FIG. 11B is a diagrammatic view in which the adjustment screen is shown at the end of the second step;

FIG. 12A is a schematic view in which the adjustment screen is shown during the third step;

FIG. 12B is a schematic view in which the adjustment screen is shown at the end of the third step;

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Ια figure 13Α is a diagrammatic view in which one represents the adjustment screen during the second stage for the adjustment of a target moment corresponding to the arrival of the weft thread, in which the sampling gives rise to a value different from the most delayed moment corresponding to the arrival of the weft thread;

FIG. 13B is a schematic view in which the adjustment screen is shown at the end of the second step;

FIG. 13C is a schematic view in which the adjustment screen is shown during the third step;

FIG. 14 is a schematic view in which the adjustment screen is represented during the fourth step for the adjustment of a target moment corresponding to the arrival of the weft thread, in which the sampling gives rise to a value different from the most delayed moment corresponding to the arrival of the weft thread;

Figure 15 is a schematic view showing a process control screen;

FIG. 16 is a flowchart for the adjustment of a target moment corresponding to the arrival of the weft thread;

FIG. 17 is a flowchart for setting a target moment corresponding to the arrival of the weft thread;

FIG. 18A is a schematic view in which the adjustment screen is shown at the end of the program for recovering the target moment corresponding to the arrival of the weft thread;

FIG. 18B is a diagrammatic view in which the adjustment screen is shown at the end of the

BE2017 / 5081 recovery of the optimal target moment corresponding to the arrival of the weft thread;

FIG. 19 is a schematic view in which the process control screen is represented at the end of the recovery of the optimal target moment corresponding to the arrival of the weft thread.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to Figures 1 to 19.

As shown in Figure 1, a weft thread insertion system 10 in an air jet type loom includes a weft accumulator IL a main nozzle 12 for the insertion of the weft thread , a tandem nozzle 13 which is mounted on the upstream side of the main nozzle 12, several groups of secondary nozzles 14A to 14F for the insertion of the weft thread, which are arranged on the downstream side of the main nozzle 12, and a ros 15. Ros 15 includes rows of teeth which include guide recesses and which are arranged in the direction of insertion of the weft thread. The tandem nozzle 13 includes an automatic braking device (ABS) 16 for the weft thread. The secondary nozzle groups 14A to 14F each include four secondary nozzles

14.

A weft thread Y is supplied from a weft thread cheese 17, which acts as a thread feeding portion, via a detector 18 of the state of the thread! weft, wraps around a length measuring drum 19 and is stored in the weft yarn accumulator 11. The weft yarn accumulator 11 includes a contact pin 20a, which is driven by

BE2017 / 5081 an electromagnetic solenoid 20 for reciprocating movement relative to the length measuring drum 19. The contacting and the removal of the contact between the contacting pin 20a and the measuring drum length 19 control the pull of the weft yarn Y from the length measuring drum 19. The length measuring drum 19 includes a photoelectric balloon detector 31 which detects a weft yarn balloon drawn from the length measuring drum 19. The balloon detector 21 detects a balloon while the weft thread Y is inserted.

The weft state detector 18 can continuously detect at least one of the weft states Y, including mass per unit length, diameter, surface structure, lint and weft material Y, which affect the theft of the weft thread Y when it is inserted via compressed air. For example, the publication of the Japanese patent in the national phase subject to public inspection No. 2014-500914 reveals a detector 18 of the state of the weft thread.

An air source 22 is connected to a main tank 25

0 via a conduit 23 and a regulator 24. The main reservoir 25 is connected to the main nozzle 12 via the conduit 23 and a main valve 26. The main reservoir 25 is also connected to the tandem nozzle 13 via the conduit 23 and a valve tandem 27. The air source 22 is connected to a secondary tank 29 via the

5 conduit 23 and a regulator 28. A controller C controls the main valve 26 and the tandem valve 27 to regulate the moment corresponding to the discharge of compressed air from the main nozzle 12 and the tandem nozzle 13. The source of air 22 may include an air compressor, for example.

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The secondary tank 29 includes several secondary valves 30, each being connected to a corresponding group among the groups of secondary nozzles 14A to 14F via the conduit 23. When each secondary valve 30 opens, the four secondary valves 14 of the corresponding group among the groups secondary nozzles 14A to 14F simultaneously discharge jets of compressed air. During the insertion of the weft thread, the controller C controls the secondary valves 30 for the opening and closing of the groups of the secondary nozzles 14A to 14F at a predetermined time in the manner of a relay, thereby discharging compressed air jets from the secondary nozzle groups 14A to 14F. A weft feeler 31 is arranged on the side of the ros 15 which is opposite to the main nozzle. The weft thread sensor 31 detects the end of the weft thread Y upon completion of the insertion of each pick.

The controller C includes a main control unit 35 and a memory 36, which act as a determination unit. Controller C regulates the pressure of the main nozzle 25 via the regulator 24 and regulates the pressure of the secondary tank 29 via the regulator 28. Controller C controls the opening and closing of the main valve 26 and of the tandem valve 25 for set the time 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 to control the relayed discharge of the groups of secondary nozzles 14A to 14F. The controller determines a successful weft thread insertion or failure thereof on the signal signals.

BE2017 / 5081 detection of the weft thread sensor 31 and detects the moment corresponding to the arrival of the weft thread TW, of each pick.

Various fabric conditions and various weaving conditions are recorded and stored in controller C. The fabric conditions can include the material of the yarn to be used as weft yarn Y, the type of weft yarn such as the numbering of the son, the density of the fi! weft, the material of the yarn to be used as warp yarn, the type of warp yarn such as the numbering of the yarns, the density of the warp yarn, the width of the fabric and the structure of the fabric. The weaving conditions may include the speed of rotation of the loom, the pressure of the compressed air in the main tank 25 and in the secondary tank 29, the degree of opening of the main valve 26 and of the tandem valve 27 , the moment corresponding to the start of the insertion of the weft thread and the target moment corresponding to the arrival of the weft thread TWm.

The controller C is connected to a control panel 40, which acts as an input / output unit. The control panel 40 includes input keys (which are not shown) and a display screen 41 for a certain amount of data. The display screen 41 includes an adjustment screen 42 which is represented in FIG. 2 and a process control screen 46 which is represented in FIG. 3. The adjustment screen 42 is used to adjust the conditions weft thread insertion for advanced feed control (FF control) which controls weft thread insertion to reduce compressed air consumption. The process control screen 46 is used to control the process before the setting is completed and the process after the start operation under the set conditions.

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As shown in FIG. 2, the adjustment screen 42 includes an adjustment field 43a of the target moment corresponding to the arrival of the weft thread for the adjustment of a target moment corresponding to the arrival of the weft thread TWm , an adjustment field 43b of the delay threshold for controlling a delay threshold TWLim of the moment corresponding to the arrival of the weft thread TW, an adjustment field 43c of the value of the advanced feed control for the control of a value of the advanced supply control Tma, a display field

43d of the most delayed moment corresponding to the arrival of the weft thread for the display of a most delayed moment corresponding to the arrival of the weft thread TWLat, which represents the moment corresponding to the arrival of the weft thread which is the most delayed in the sampling period in which the weft thread insertion is implemented several times, and a control field of the sampling value 43e. In addition, the adjustment screen includes a message display screen 44, a switch 45a for inspecting the target moment corresponding to the arrival of the weft thread, a sampling switch 45b and

0 a setting switch 45c. The delay threshold TWLim of the moment corresponding to the arrival of the weft thread TW represents the threshold of the advanced feed control. The value Tma of the advanced feed control represents the value for adjusting the degree of opening of the main valve 26 and the

5 tandem valve 27.

The main control unit 35 compares the delay threshold TWLim from the moment corresponding to the arrival of the weft thread TW to the most delayed moment corresponding to the arrival of the weft thread TWLat, which is the most delayed in 1,000 picks which are

BE2017 / 5081 inserted for Ια value set in the setting field of the sampling value 43e and under the conditions set in the setting field of the target moment corresponding to the arrival of the weft thread 43a, in the setting field of the delay threshold 43b, and in the field for adjusting the value of the advanced feed control 43c. The main control unit 35 changes the value of the advanced supply control Tma based on the comparison. In other words, the main control unit 35 of the controller C acts as a change control unit. In addition, the main control unit 35 delays the target moment corresponding to the arrival of the weft thread TWm in a range in which the advanced feed control can maintain the most delayed moment corresponding to the arrival of the weft thread. TWLat frame advanced with respect to the TWLim delay threshold. In other words, the main control unit 35 of the controller C also acts as a control unit for the change of the target moment corresponding to the arrival of the weft thread.

As shown in FIG. 3, the process control screen 46 includes a display field of steps 47, a display field 48a of the target moment corresponding to the arrival of the weft thread, a field 48b d display of the time delay threshold corresponding to the arrival of the weft thread TW, a display field 48c of the advanced feed control, a display field 48d of the most delayed moment corresponding to the arrival of the weft thread, a field for displaying the sampling value 48e, and a field for displaying messages 49.

The step display field 47 displays a sequence of operating steps which are implemented during

BE2017 / 5081 the implementation of the flowchart for setting a target moment corresponding to the arrival of the weft thread TWm. The sampling value represents the sampling time span or the number of picks. The message display field 49 displays the letters A to C which correspond to the respective messages which are displayed in the setting screen 42 during the implementation of the flow chart for the setting of a target moment corresponding to the arrival of the TWm weft thread.

In FIG. 4, an example of an adjustment screen 10 50 is shown for the adjustment of a target moment corresponding to the arrival of the weft thread TWm. The adjustment screen 50 includes an adjustment field 43a of the target moment corresponding to the arrival of the weft thread, a delay threshold adjustment field 43b, an adjustment field of the value of the advanced feed control

43c, and a display field 43d of the most delayed moment corresponding to the arrival of the weft thread in a manner similar to that of the adjustment screen 42. In addition, the adjustment screen 50 includes a screen message display 44, an inspection switch 45a of the target moment corresponding to the arrival of the weft thread, a sampling switch 45b, and an adjustment switch for the inspection process 45c. In addition, the setting screen 50 includes a field for displaying the quantity of missing picks 51a, a display field for the sampling value 51b, and a reference display field 52 for missing picks.

In FIG. 5, a part of a process control screen 53 is shown for the adjustment of a target moment corresponding to the arrival of the weft thread TWm. The process control screen 53 includes a step display field 47, a display field

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48α of the target moment corresponding to the arrival of the weft of frame, a display field of the delay threshold 48b, a display field 48d of the most delayed moment corresponding to the arrival of the weft thread, and a field of display of the sampling value 48e in a similar manner to that of the process control screen 46. In addition, the process control screen 53 includes a display screen 54 of the quantity of missing picks and a suggestion display field 55. The suggestion display field 55 displays the letters A to C and F which correspond to respective messages displayed in the setting screen 50 during the implementation of the flowchart for setting a target moment corresponding to the arrival of the weft thread TWm or of the flowchart for ia recovery of the optimal target moment corresponding to the arrival of the weft thread.

The flight characteristics of the weft thread Y can vary even under the same conditions of insertion of the weft thread. This is how the moments TW corresponding to the arrival of the weft yarn Y form a normal distribution, as shown in the figure.

2. As is well known, the moment TW corresponding to the arrival of the weft thread which is displayed relative to Tangle X formed by the loom significantly increases the risks of missing picks. Thus, the target moment corresponding to the arrival of the weft thread TWm, which represents the median value of the normal distribution, is adjusted so that the normal distribution of the moments TW corresponding to the arrival of the weft thread does not exceed the straight line L which represents the angle X formed by the loom. The straight line L indicating the angle X formed by the loom represents the limit line beyond which missing picks are frequent. The time corresponding to

BE2017 / 5081 the arrival of the weft thread TW which is advanced relative to the angle X which is formed by the loom is less likely to give rise to missing picks. The controller C predicts the moment corresponding to the arrival of the weft thread TW based on the state of the weft thread Y detected by the detector 18 of the state of the weft thread. When the moment TW corresponding to the arrival of the weft thread is predicted to be delayed with respect to the delay threshold TWLim during the insertion of the weft thread Y, the controller C executes an advanced power command and increases the degree of opening of the main valve 26 and of the tandem valve 27 via the advanced supply control value Tma. In this way, the amount of air jet is increased from the main nozzle 12 and from the tandem nozzle 13, so that the real moment TW corresponding to the arrival of the weft thread is advanced relative to the TWLim delay threshold (as can be seen in Figure 7).

The advanced feed control shown in FIG. 7 maintains the moment TW corresponding to the arrival of the weft thread to prevent it from exceeding the delay threshold TWLim, in

0 allowing the target moment corresponding to the arrival of the weft thread TWm to be delayed correspondingly (as can be seen by the solid line which is represented in FIG. 8). This characteristic in turn makes it possible to reduce the pressure of the main tank 25 and of the secondary tank 29, giving rise to

5 a reduction in compressed air consumption.

A target moment corresponding to the arrival of the weft thread

TWm can be adjusted as shown below. Controller C recovers the optimal target moment corresponding to the arrival of the wire

BE2017 / 5081 of TWm frame through the flowchart that is shown in Figure 9.

Firstly, in step SI, the initial settings are made for the target moment corresponding to the arrival of the weft thread TWm, the delay threshold TWLim, and the value of the advanced supply control Tma. The values that the operator enters using the adjustment screen 42 displayed in the display screen 41 of the control panel 40 are used as the target moment corresponding to the arrival of the weft thread TWm, as delay threshold TWLim, and as a value of the advanced supply control Tma. At this moment, the display screen 41 displays the adjustment screen 42 which is represented in FIG. 10A. When the operator presses the switch 45a of the target moment inspection corresponding to the arrival of the weft thread in this setting screen 42, the insertion of weft thread starts. The display screen 41 then displays the adjustment screen 42 which is represented in FIG. 10B. The values are designated in the form of the angles formed by the loom (i.e. the angles of rotation of the loom).

After the start of the insertion of the weft yarn, in step S2, the moment corresponding to the arrival of the weft thread TW is adjusted, and in step S3, it is determined whether the corresponding moment on arrival of the weft thread TW is stabilized. The moment corresponding to the arrival of the weft thread TW is considered to be stable when the moment corresponding to the arrival of the weft thread TW enters the predetermined range. When the moment TW corresponding to the arrival of the weft yarn is determined to be stable, in step S3, ie control flow goes to step S4 in which the insertion of the weft yarn is subjected to a

BE2017 / 5081 sampling for 1,000 picks and the data relating to the moment TW corresponding to the arrival of the weft yarn for each pick is stored in memory 36. Then, the controller C passes the control flow to step S5 and determines, from the sampling data, whether the most delayed moment corresponding to the arrival of the weft thread TWLat is equal to the delay threshold TWLim. Since the most delayed moment corresponding to the arrival of the TWLat weft yarn is at 265 °, while the TWLim delay threshold is at 260 °, ie controller C passes the control flow to the step S6 and determines whether the most delayed moment corresponding to the arrival of the weft thread TWLat is greater than the delay threshold TWLim. Since the most delayed moment corresponding to the arrival of the TWLat weft thread is at 265 °, while the TWLim delay threshold is at 260 °, controller C passes the control flow to the step S7 and determines whether the advanced power control value Tma is equal to 30 °. Since the value Tma is equal to 0 °, the controller C passes the control flow to step S8 and displays in the message display screen 44 of the adjustment screen 42 the message “TW is delayed. Increase the FF command value by 15 ° ”, which corresponds to point A. Thus, the adjustment screen 42 is as shown in FIG. 10C. The completion of steps S2 to S8 ends the first step.

In accordance with what he is invited to do by referring to the content of the message “TW is delayed. Increase the FF command value by 15 ° ", in the message display screen 44, the operator adds 15 ° to the angle set in the adjustment field of

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Avancéeα advanced power control value 43c from the setting screen 42 in step S9.

After step S9, the controller C crosses step S2, thereby beginning the second step. The second step differs from the first step in that Its second step starts under conditions such that the value of the advanced supply control Tma has been changed from 0 ° to 15 °.

Then, controller C goes through steps S2 to $ 4 in a similar way to the first step. The sampling in step S4 gives rise to a change in the most delayed moment corresponding to the arrival of the weft thread TWLat, which goes from 265 ° to 260 °. Thus, the display screen 41 displays the adjustment screen 42 as shown in FIG. 11 A. Since the delay threshold TWLim and the most delayed moment corresponding to the arrival of the weft thread TWLat lie crazy two at 260 °, the decision in step S5 is YES. Controller C passes the control flow to step S10 and determines whether the advanced power control value Tma is 30 °. Since the advanced supply command value Tma is equal to 15 ° at this stage, the controller C passes the command flow to step SU and displays, in the message display screen 44 of the setting screen 42, the message "Increase the FF command value by 15 ° and delay the TWm moment by 5 °", which corresponds to point B. The setting screen 42 is as it is

5 shows in Figure 1 IB. The completion of steps S2 to $ 5, S10 and SI 1 completes the second step.

In accordance with what he is invited to do by referring to the content of the message "Increase the FF command value by 15 ° and delay the TWm moment by 5 °", in the display screen of

BE2017 / 5081 messages 44, the operator adds 15 ° to the angle set in the setting field 43c of the advanced feed control value of the setting screen 42 and adds 5 ° to the angle set in ie control field 43a of the target moment corresponding to the arrival of the weft yarn, in step SI2.

After step SI2, the controller C crosses step S2, thereby starting the third step. The third step differs from the second step in that the third step starts under conditions such that the value of the advanced supply control Tma has been changed from 15 ° to 30 °.

Then, controller C goes through steps S2 to S4 in a similar way to the second step. Sampling in step S4 gives rise to the fact that the most delayed moment corresponding to the arrival of the weft thread TWLat remains at 260 °. Thus, the display screen 41 displays the control screen 42 as shown in FIG. 12A. Since the TWLim delay threshold and the most delayed moment corresponding to the arrival of the TWLat weft thread are both at 260 °, the decision in step S5 is YES. Controller C passes the control flow to step S10 and determines whether the advanced power control value Tma is 30 °. Since the advanced supply command value Tma is equalized to 30 ° at this stage, the controller C passes the command flow to step SI3 and displays in the message display screen 44 of the setting screen 42 the message “Completion of recovery of the TWm value (the value of the advanced feed command FF has reached the limit)”, which corresponds to point C. The setting screen 42 is such that is shown in Figure 12B. The completion of steps S2 to SI 3 completes the third step.

BE2017 / 5081

After the completion of the recovery of the optimal target moment corresponding to the arrival of the weft thread TWm, the loom of the air jet type begins weaving with the target moment corresponding to the arrival of the weft thread TWm and the value of the advanced supply command Tma which is obtained at the end of the third step. After the completion of the recovery of the target moment corresponding to the arrival of the weft thread TWm, the display screen 41 displays the process control screen 46 which is represented in FIG. 3. Since the recovery of the target moment corresponding to the arrival of the weft thread TWm has been completed by passing through three stages, the process control screen 46 displays the target moment corresponding to the arrival of the weft thread TWm, the threshold of TWLim delay, the advanced power control value Tma, the most delayed moment corresponding to the arrival of the TWLat weft thread, the sampling value, and the message displayed for each of the first three steps.

We will now describe another example in which the initial settings of the target moment corresponding to the arrival of the weft thread TWm, of the delay threshold TWLim, and of the value of the advanced supply control Tma are identical to those of the previous example, while the value of the most delayed moment corresponding to the arrival of the weft TWLat, which results from the sampling in the second step, differs from that of the previous example. The controller C recovers the optimal target moment corresponding to the arrival of the weft thread TWm by following the flow diagram of FIG. 9.

In the first step, steps S2 to S9 are taken in a similar manner to that of the previous example being

BE2017 / 5081 given that Ια value of the most delayed moment corresponding to the arrival of the weft thread TWLat which is obtained from the sampling in step S4 is identical. The message in the message display screen 44 of the adjustment screen 42 which is represented in FIG. 10C invites the operator to add 15 ° to the angle set in the adjustment field 43c of the value of the advanced power control of the setting screen 42 in step S9. Then, the controller takes step S2, thereby starting the second step.

In this example, the sampling in step S4 in the second step gives rise to a change in the most delayed moment corresponding to the arrival of TWLat weft thread which goes from 265 ° to 255 °. Thus, the display screen 41 displays the setting screen 42 which is represented in FIG. 13A. Since the TWLim delay threshold is 260 ° and the most delayed time corresponding to the arrival of the TWLat weft yarn is 255 °, the decision in step S5 is NO. The controller C passes the control flow to the step at step S6 and determines whether the most delayed moment corresponding to the arrival of the weft thread TWLat is greater than the delay threshold TWLim. Since the most delayed moment corresponding to the TWLat delay threshold is equal to 255 ° and since the TWLim delay threshold is equal to 260 °, the controller C passes the control flow to step SI4 and displays in the message display screen 44 of the adjustment screen 42 the message: “Keep the value in force of the advanced feed control and the TWm delay at 5 °”, which corresponds to point D. L the adjustment screen 42 is as shown in FIG. 13B. The completion of steps S2 to S6, SI4 and SI5 completes the second step.

BE2017 / 5081

In accordance with what it is invited to do by referring to the content of the message "Maintain the value in force of the advanced feed control and the TWm delay at 5 °", in the message display screen 44, the operator adds 5 ° to the angle formed by the target moment corresponding to the arrival of the weft thread TWm in the display screen 42 in step SI 5.

After step Si5, the controller C crosses step S2, thereby beginning the third step. The third step differs from the second step in that the third step starts under conditions such that the target moment corresponding to the arrival of the weft thread TWm has been changed from 240 ° to 245 °.

Then, the controller C takes steps S2 to S4 in a similar way to that of the first step. The sampling in step S4 gives rise to a change in the most delayed moment corresponding to the arrival of the weft thread TWLat, which goes from 255 ° to 260 °. Thus, the display screen 41 displays the adjustment screen 42 as shown in FIG. 13C.

Controller C then passes the control flow to step S5 and determines whether the most delayed time

0 corresponding to the arrival of the TWLat weft thread is equal to the TWLim delay threshold. Since the most delayed moment corresponding to the arrival of the TWLat weft yarn is equal to 260 ° and since the TWLim delay threshold is equal to 260 °, the controller C passes the control flow to the step StO and determines whether the value of the advanced supply control Tma is equal to 30 °. Since the value of the advanced supply command Tma is equal to 15 ° at this stage, the controller C passes the command flow to step SI 1 and displays in the message display screen 44 of

BE2017 / 5081 the setting screen 42, the message "Increase the value of the advanced FF feed command by 15 ° and delay the TWm moment by 50 °", which corresponds to point B. The setting screen 42 is therefore shown in Figure 11B, with the exception that the angle set in the setting field 43a of the target moment corresponding to the arrival of the weft thread is 245 °. The completion of steps S2 to SI 1 completes the third step.

In accordance with what he is invited to do by referring to the content of the message "Increase the value of the advanced FF feed command by 15 ° and delay the TWm moment by 50 °", in the display screen of messages 44, the operator adds 15 ° to the angle set in the setting field 43c of the value of the advanced feed command of the setting screen 42 and adds 5 ° to the angle set in the target moment corresponding to the arrival of the weft thread TWm in step S12.

After step SI2, the controller C passes step S2, thereby starting the fourth step. The fourth step differs from the third step in that the fourth step starts under conditions such that the value of the advanced supply command Tma has been changed from 15 ° to 30 ° and that the target moment corresponding to l The arrival of the TWm weft thread has been changed from 245 ° to 250 °.

Then, the controller C goes through steps S2 to S4 in a similar way to that of the third step. Sampling in step S4 ensures that the most delayed moment corresponding to the arrival of the TWLat weft yarn is 260 °. This is how the display screen 41 displays the adjustment screen 42 which is represented in FIG. 14.

5

BE2017 / 5081

Controller C then passes the command flow to step $ 5 and determines whether the most delayed moment corresponding to the arrival of the weft thread TWLat is equal to the delay threshold TWLim. Since the most delayed moment corresponding to the arrival of the weft thread is 260 ° and since the TWLim delay threshold is equal to 260 °, the controller C passes the control flow to the step SI0 and determines whether the value of the direct action command Tma is equal to 30 °. Since the value of the direct action command Tma is equal to 30 ° at this stage, the controller C passes the command flow to step S13 and displays, in the message display screen 44 of the setting screen 42, the message “Recovery of moment TWm completed. (The value of the advanced feed command FF has reached the limit) ", which corresponds to point C. Consequently, the adjustment screen 42 is as shown in FIG. 2B, with the exception that the angle set in the setting field 43a of the target moment corresponding to the arrival of the weft thread has been changed to 250 °. The completion of steps S2 to S5, S10 and SI 3 completes the fourth step. After the completion of the recovery of the target moment corresponding to the arrival of the weft thread TWm, the loom of the air jet type starts weaving with the target moment corresponding to the arrival of the weft thread TWm and the value of the advanced supply command Tma in force at the end of the fourth step.

After having completed the recovery of the target moment corresponding to the arrival of the weft thread TWm, the display screen 41 displays the process control screen 46 which is represented in FIG. 15. Since the recovery of the target moment

BE2017 / 5081 corresponding to the arrival of the weft thread TWm has been completed by passing through four stages, the process control screen 46 displays the target moment corresponding to the arrival of the weft thread TWm, the delay threshold TWLim, the value of the advanced supply command Tma, the most delayed moment corresponding to the arrival of the weft thread TWLat, the sampling value, and the message displayed, for the first four respective stages.

We will now describe another example in which a target moment is set corresponding to the arrival of the weft thread TWm while changing the delay threshold TWLim taking into account missing picks. In this example, after operating the weaving loom with the target moment corresponding to the arrival of the weft thread TWm set as described above, the target moment corresponding to the arrival of the weft thread TWm is subject to a change to take a more appropriate value based on the rate of missing picks in a predetermined operational time period, which is set in advance.

Referring to the flowcharts in FIGS. 16 and 17, the controller C recovers the optimal target moment corresponding to the arrival of the weft thread TWm.

As indicated in FIG. 16, in step S1, the initial settings are made for the target moment corresponding to the arrival of the weft thread TWm, the delay threshold TWLim, and the value of the supply command. advanced Tma. The values entered between the operator with the adjustment screen 50 which is represented in FIG. 4 displayed in the display screen 41 of the control panel 40 are used as the target moment corresponding to the arrival of the weft TWm, of the delay threshold TWLim, ef of the value of the

BE2017 / 5081 Tma advanced power control. The operator also enters values in the display field of the sampling value 51b and in the reference display field for the missing duifes 52 in the setting screen 50.

The operator presses the target moment inspection switch corresponding to the arrival of the weft thread 45a in this setting screen 50, which gives rise to the triggering of the insertion of weft thread and to the execution of the program “SI: TWm recovery program” in the flowchart that is shown in Figure 16.

As indicated in FIG. 17, the step “SI: TWm recovery program” is identical to that of the flow diagram of FIG. 9 which has been described above. Thus, the results of the first stage (Sl-1), of the second stage (SI-2), and of the third stage (S 1-3) which one represents in figure 19, are supposed to be identical to those of the first embodiment and we will now describe the process that takes place from step SI02 after the step “SI: TWm recovery program” in the flowchart of FIG. 16.

When the stage “SI: TWm recovery program” ends, the angles corresponding to the target moment corresponding to the arrival of the weft thread TWm, to the delay threshold TWLim, and to the value of the advanced feed command Tma are equal to 245 °, 260 ° and 30 °, respectively. It is in this

5 state that the recovery of the optimal target moment corresponding to the arrival of the weft thread TWm begins. In step S102, the moment corresponding to the arrival of the weft thread TW is checked, and in step S103 it is determined whether the moment corresponding to the arrival of the weft thread TW is stabilized. When ie

BE2017 / 5081 time corresponding to the arrival of the weft thread TW is determined to be stable in step SI03, the control flow goes to step SI04 in which weft thread insertion data is subjected to a Sampling for a period of two hours during the insertion of the weft yarn and Its data concerning the moment corresponding to the arrival of the weft yarn TW of each pick are stored in memory 36. By this we mean that, when the time corresponding to the arrival of the weft thread TW is determined to be stable in step S103, the air jet type loom passes the control flow to step S104 and executes weaving for a predetermined period of time (two hours in the present embodiment), which is set in advance, according to the values set concerning the target moment corresponding to the arrival of the weft thread TWm, the threshold of delay TWLim, and Sa v value of the advanced supply control Tma, and performs a sampling relating to the time corresponding to the arrival of the weft thread TW of each pick during this period of time.

After two hours of weaving, controller C obtains the angle of the moment corresponding to the arrival of the TWLat weft yarn and the quantity of missing picks (picks / hour) from the result of sampling, and displays the values in the setting screen 50 in the display screen 41, as shown in FIG. 18A. Controller C also passes the command flow to step S105 in the flowchart of Figure 16 and determines based on the sampling data whether the most delayed time corresponding to arrival of the TWLat weft thread is greater than the TWLim delay threshold plus 5 °. Since the most delayed moment corresponding to the arrival of the weft thread

BE2017 / 5081

TWLat is equal to 260 ° and the TWLim delay threshold is equal to 260 °, controller C passes the command flow to step SI06 and determines whether the quantity of missing picks (Wmiss) is greater to the reference concerning missing picks (2 picks / hour). Since the quantity of missing picks is 0.5 pick / hour, controller C passes the command flow to step SI07 and displays in the message display screen 44 of the setting 50 the message "Delay the TWLim value by 5 °", which corresponds to point F. The completion of steps SI 02 to SI07 completes the recovery of the optimal target moment corresponding to the arrival of the weft of the first step (BSI).

In accordance with what he is asked to do by referring to the content of the message "Delay the TWLim value by 5 °", in the message display screen 44, the operator adds 5 ° to the angle in the delay threshold setting field 43b of the setting screen 50 in order to delay the delay threshold TWLim by 5 ° in step SI 08.

After the step SI08, the controller C executes the step “SI: program for recovering the value TWm” which is shown in FIG. 17. This step “If: program for recovering the value TWm” differs from the previous one by the fact that it starts with a target moment corresponding to the arrival of the TWm ega weft thread! at 245 ° and a TWLim delay threshold equal to 265 °.

After the start of the insertion of the weft thread, in step S2, the moment corresponding to the arrival of the weft thread TW is adjusted, and the command flow goes to step $ 4 when the moment corresponding to the arrival of the weft thread TW is determined to be stable in step S3. In step S4, we proceed to

BE2017 / 5081 the sampling sampling of the weft fii for 1,000 picks and we store the data concerning the moment corresponding to the arrival of the weft thread TW of each pick in memory 36. Then, the controller C passes the control flow in step S5 and determines from the sampling data, whether the most delayed moment corresponding to the arrival of the weft thread TWLat is equal to the delay threshold TWLim. Since the most delayed moment corresponding to the arrival of the weft thread TWLat is equal to 260 ° and the delay threshold TWLim is equal to 265 °, the controller C passes the control flow to step S6 and determines whether the most delayed time corresponding to the arrival of the weft thread TWLat is greater than the delay threshold TWLim. Since the most delayed moment corresponding to the arrival of the weft thread TWLat is equal to 260 ° and that the delay threshold TWLim is equal to 265 °, the controller C passes the control flow to step SI4 and displays in the message display screen 44 of the adjustment screen 50 the message "Maintain the value in force of the advanced feed control FF and delay the value TWm by 5 °", which corresponds to the point D. The completion of steps S2 to S6 and SI4 completes the first step of "SI: TWm value recovery program" (BS2-1) concerning the optimal target moment corresponding to the arrival of the weft thread of the second stage (BS2).

In accordance with what he is invited to do by referring to the content of the message "Maintain the value in force of the advanced feed control FF and delay the TWm value by 5 °" in the message display screen 44 , the operator adds 5 ° to the angle formed by the target moment corresponding to the arrival of the weft thread TWm set in the target moment setting field

BE2017 / 5081 corresponding to the weft thread arrival 43a of the adjustment screen 50 in order to delay the target moment corresponding to the arrival of the weft thread TWm by 5 ° in step S15.

After the step SI5, the controller C crosses the step S2, thus beginning the second step of “SI: recovery program of the TWm value” (BS2-2) for the second step of recovering the optimal target moment corresponding to the arrival of the weft thread (BS2). The second step (BS2-2) differs from the first step (BS2-1) in that the second step (BS2-2) begins with a target moment corresponding to the arrival of the weft thread which has been changed to pass from 245 ° to 250 °.

Then, the controller C takes steps S2 to S4 in a similar way to that of the first step (BS2-1). The sampling in step S4 gives rise to a change in the most delayed moment corresponding to the arrival of the TWLat weft thread which passes from 260 ° to 265 °.

Controller C then passes the control flow to step 55 and determines whether the most delayed moment corresponding to the arrival of the weft thread TWLat is equal to the delay threshold TWLim. Given that the most delayed moment corresponding to the arrival of the weft thread TWLat is equal to 265 ° and that the delay threshold TWLim is equal to 265 °, the controller C passes the control flow to step SI0 and determines whether the value of the advanced power control Tma is 30 °. Since the value of the advanced supply command Tma rises to 30 ° at this stage, the controller C passes the command flow to step SI7 and displays in the message display screen 44 of the setting screen 50 the message “Recovery of the TWm value completed. [The value of

BE2017 / 5081 avancéeα advanced feed command FF has reached the limit) ", which corresponds to point C. The setting screen 50 is as shown in FIG. 18B. The completion of steps S2 to $ 5, steps S10 and SI7 completes the second step of "SI:

TWm value recovery program ”(BS2-2) with regard to the second stage of recovery of the optimal target moment corresponding to the arrival of the weft thread (BS2) and completes the second stage of recovery of the target moment optimal corresponding to the arrival of the weft thread (BS2).

Then, the air jet type loom begins weaving with the target moment corresponding to the arrival of the weft thread TWm, the delay threshold TWLim, and the value of the advanced feed control Tma that l 'We obtain at the end of the second stage of recovery of the optimal target moment corresponding to the arrival of the weft thread (BS2). During weaving, the controller C samples the weft thread insertion data and stores the data concerning the moment corresponding to the arrival of the fi! TW frame of each pick and the number of missing picks (the number of picks) in memory 36.

After two hours of weaving, the controller C passes the command flow to step SI05 in the flowchart that your represents in FIG. 16 and determines from the sampling data the fact of knowing whether the most delayed moment corresponds at the arrival of the weft thread TWLat is greater than the delay threshold TWLim plus 5 °. Since the most delayed moment corresponding to the arrival of the weft thread TWLat is equal to 265 ° and that the delay threshold TWLim is equal to 265 °, the controller C passes the control flow to step SI06 and determines the fact of

BE2017 / 5081 find out if the number of missing picks (Wmiss) is greater than the reference concerning missing picks (2 picks / hour). Since the number of missing picks is 0.5 pick / hour, controller C passes the command flow to step SI07 and displays in the message display screen 44 of the setting 50 the message "Delay the TWLim value by 5 °", which corresponds to point F.

In accordance with what he is asked to do by referring to the content of the message "Delay the TWLim value by 5 °" in the message display screen 44, the operator adds 5 ° to the angle set in ie delay threshold setting field 43b of the setting screen 50 in order to delay the delay threshold TWLim by 5 ° in step

S108.

Next, the controller C executes the program “SI: 15 program for recovering the TWm value” which is shown in FIG. 17. This program “SI: Program for recovering the TWm value” differs from the previous one in that it starts with a target moment corresponding to the arrival of the weft thread

TWm equal to 250 ° and a TWLim delay threshold equal to 270 °.

Next, the controller C takes steps S2 to S4 in a similar manner to that of the first step. Sampling in step S4 gives rise to the fact that the most delayed moment corresponding to the arrival of the TWLat weft yarn has been changed from 265 ° to 270 °. Controller C passes the control flow to step S5 and determines from the sampling data whether the most delayed moment corresponding to the arrival of the weft thread TWLat is equal to the delay threshold TWLim . Since the most delayed moment corresponding to the arrival of the TWLat weft thread is equal to 270 ° and

BE2017 / 5081 that the delay threshold TWLim is equal to 270 °, the controller C passes the command flow to step SI0 and determines whether the value of the advanced power command Tma is equal to 30 °. Since the value of the advanced supply command Tma is equal to 30 ° at this stage, the controller C passes the command flow to step SI7 and displays in the message display screen 44 of the 'setting screen 50 Message' Recovery of TWm value completed. (The value of the advanced feed command FF has reached the limit) ", which corresponds to point C. The setting screen 50 is therefore as shown in FIG. 18B, with the exception that the values set in the delay threshold setting field 43b and in the most delayed moment display field corresponding to the arrival of the weft yarn 43d have been changed to 270 °.

Then, the controller C takes steps SI02 and SI03 in the flow diagram of FIG. 16 in a similar manner. When the time corresponding to the arrival of the weft thread TW is determined to be stable in step SI03, the control flow goes to step SI04 for the purpose of sampling the insertion thread data of weft for two hours during the insertion of weft yarn, counting the number of missing picks and storing the result in memory 36. Sampling takes place at a time corresponding to the arrival of the weft TWLat amounting to 270 ° and a quantity of missing picks amounting to 3 picks / hour.

Controller C then passes the command flow to step SI05 in the flowchart in Figure 16 and determines from the sampling data whether

BE2017 / 5081 the most delayed corresponding to the arrival of the TWLat weft thread is greater than the TWLim delay threshold plus 5 °. Since the most delayed moment corresponding to the arrival of the weft thread TWLat is equal to 270 ° and that the delay threshold TWLim is equal to 270 °, the controller C passes the control flow to step SI06 and determines whether the quantity of missing picks (Wmiss) is greater than the reference for missing picks (2 picks / hour). Since the quantity of missing picks is 3 picks / hour, controller C ίο pass the command flow to step SI09, advances the TWLim delay threshold by 5 °, and reduces the target moment corresponding to the arrival of the 5m TWm weft thread. Then, the controller C passes the command flow to step SI 10 and displays in the message display screen 44 of the adjustment screen 50 the message "Recovery of the TWLim value completed", which corresponds at point G, and ends the recovery of the optimal target moment corresponding to the arrival of the weft thread.

When the most delayed moment corresponding to the arrival of the weft thread TWLat is greater than the delay threshold TWLim plus 5 ° in step SI05 in the flowchart of FIG. 16, the controller C passes the command flow to step SI 12 and displays in the message display screen 44 of the adjustment screen 50, the message "Advance the TWm value by 5 °", which corresponds to point E. In accordance with what it is invited to do by referring to the content of the message "Advance ia TWm value of 5 °" in the message display screen 44, the operator subtracts 5 ° from the angle displayed in the current display field target corresponding to the arrival of the weft yarn 48a of the adjustment screen 50 in order to advance the target moment corresponding to the arrival of the

BE2017 / 5081 5 ° frame in step SI 13. After step SI 13, the controller C executes the program “SI: TWm value recovery program” which is represented in FIG. 17.

After recovering the optimal target moment taking into account the missing picks, the process control screen 53 as shown in FIG. 19 will be displayed when the recovery process is displayed in the display screen 41. When recovery of the optimal target moment has been carried out once, the process control screen 53 represents the steps taken before the completion of a two-hour sampling cycle. When the recovery of the optimal target moment has been carried out twice, the process control screen 53 represents the steps taken before the completion of two two-hour sampling cycles.

When setting the target moment corresponding to the arrival of the weft thread TWm without modifying the delay threshold TWLÎm taking into account the rate of missing picks, the operator calls the setting screen 42 in the display screen 41 of the control panel 40, which is connected to the controller C.

The operator sets the target moment corresponding to the arrival of the weft thread TWm, the delay threshold TWLÎm, the value of the advanced feed command Tma in the setting field of the target moment corresponding to the arrival of the weft frame 43a, in the delay threshold setting field 43b, and in the setting field of the value of the advanced power control 43c in the setting screen 42 and active Switch of the corresponding target moment inspection at the arrival of the weft thread 45a. Controller C performs the recovery procedure following the flowchart in Figure 9. The message display screen 44

BE2017 / 5081 of the setting screen 42 gives instructions to the operator during the recovery procedure, which allows the operator to set an appropriate target moment corresponding to the arrival of the weft thread TWm by following The instructions displayed in the message display screen 44. In addition, the process control screen 46 allows the operator to check the progress during the procedure.

When setting the optimal target moment corresponding to the arrival of the weft thread TWm while changing the delay threshold

TWLim taking into account the missing picks, the operator calls the adjustment screen 50 in the display screen 41 of the control panel 40. The operator sets the target moment corresponding to the arrival of the weft thread TWm , the delay threshold TWLim, and the value of the advanced supply control Tma in the setting field of the target moment corresponding to the arrival of weft yarn 43a, in the setting field of the delay threshold 43b, and in the setting field for the value of the advanced feed control 43c in the setting screen 50. The operator also enters values concerning the sampling value and the reference concerning missing picks in the display field of the sampling value 51b and in the display field of the reference concerning the missing picks 52 in the setting screen 50 and then presses the inspection switch of the target moment corresponding to the arrival of the weft thread 45a in the adjustment screen 50. The controller C then executes the recovery procedure by following the flowcharts which are represented in FIGS. 16 and 17. The message display screen 44 of the setting screen 50 gives instructions to

BE2017 / 5081 the operator during the recovery procedure, which allows the operator to set an appropriate target moment corresponding to the arrival of the weft thread TWm by following the instructions displayed in the display screen of messages 44.

After having let the air jet type loom work for the predetermined period of time (for example two hours), mistletoe is adjusted in advance, with the appropriate target moment corresponding to the arrival of the weft thread. TWm, the setting screen 50 displays the number of missing picks and instructions for the operator. In addition, the operator can check the previous process by calling the process control screen 53.

In addition, the operator can check the process control screen 53 after leaving the air-jet type loom to work for the predetermined period of time (e.g. two hours) and appropriately determines from of the state of occurrence of the missing picks, the fact of knowing whether to change the target moment corresponding to the arrival of the weft thread TWm in order to reduce the air consumption.

The present embodiment offers the advantages indicated below.

(1) the air jet type loom includes the main nozzle 12 for the insertion of the weft thread and the secondary nozzles 14 for the insertion of the thread! of weft and inserts the weft yarn Y using an air jet from the main nozzle 12 and from the secondary nozzles 14. The method for controlling or adjusting the insertion of weft yarn in the loom weaving type weaving machine detects the state of the weft yarn before insertion, with a weft state detector 18. The advanced feed control increases the amount of air jet from

BE2017 / 5081 of Ια main nozzle 12 and from the tandem nozzle 13 when the time corresponding to the arrival of the weft thread TW predicted from the detected state of the weft thread is delayed with respect to the delay threshold TWLim . In addition, the method delays the target moment corresponding to the arrival of the weft thread TWm in a range in which the advanced feed control can maintain the moment corresponding to the arrival of the weft thread TW advanced relative to the threshold of TWLim delay.

Such a method makes it possible to delay the target moment corresponding to the arrival of the weft thread TWm without giving rise to an increase in the missing picks, thereby lowering the pressure of the compressed air from the main nozzle 12 and the secondary nozzles 14. Consequently, the consumption of compressed air of the air jet type loom is reduced without giving rise to an increase in missing picks.

(2) After carrying out an insertion of the weft thread during the predetermined period of time with the target moment corresponding to the arrival of the weft thread TWm, the rate (the quantity) of missing picks is checked. When the rate of missing picks is lower than the predetermined rate, the delay threshold is delayed. The delayed delay threshold TWLim which results from a lower rate of missing picks makes it possible to further delay the target moment corresponding to the arrival of the weft thread TWm. In this way, the compressed air consumption of the air jet type loom is further reduced.

(3) Controller C, which acts as the weft thread insertion controller, inserts the weft thread Y using an air jet from the main nozzle 12 and from the secondary nozzles 14, detects the weft state Y before insertion,

BE2017 / 5081 with a weft thread state detector 18 and performs an advanced supply control which increases the amount of air jet from the main nozzle 12 and from the tandem nozzle 13 when the time corresponding to the arrival of the weft thread TW predicted from the detected state of the weft thread is delayed with respect to the delay threshold TWLim. Controller C includes the target moment setting field corresponding to the weft thread arrival 43a, the delay threshold setting field 43b, and the setting field of the value of the advanced power control 43c, which act as the adjustment unit which regulates the target moment corresponding to the arrival of the weft thread TWm, the delay threshold TWLim of the moment corresponding to the arrival of the weft thread, and the value of the power control advanced Tma. In addition, the controller C includes the control unit for changing the value of the advanced power control, which changes the value of the advanced power control Tma based on the comparison between the delay threshold TWLim of the time corresponding to the arrival of the TW weft yarn and the most delayed time corresponding to the arrival of the weft yarn

0 TWLat weft which is the most delayed in the insertion of weft yarn implemented under the adjustment conditions adjusted with the adjustment fields 43a to 43c, and the control unit for the change of the target moment corresponding to the arrival of the weft thread, which delays the target moment corresponding to the arrival of the weft thread TWm in a range in which the advanced feed control can maintain the most delayed moment corresponding to the arrival of the weft thread TWLat advanced by compared to the TWLim delay threshold.

BE2017 / 5081

Consequently, the target moment corresponding to the arrival of the weft thread TWm is delayed without giving rise to an increase in the missing picks, so that the pressure of the compressed air of the main nozzle 12 and of the secondary nozzles 14 is lowered. Consequently, the consumption of compressed air of the air jet type loom is reduced without giving rise to an increase in missing picks.

(4) The controller C includes the adjustment screens 42 and 50 which display the results of the adjustment of the adjustment unit. This structure allows the operator to check, using the adjustment screens 42 and 50, the fact of knowing whether the correct values are adjusted as regards the target moment corresponding to the arrival of the weft thread TWm, the delay threshold TWLim of the moment corresponding to the arrival of the weft thread TW, and the value of the advanced supply control Tma.

(5) Controller C can include the process control screens 46 and 53 which display the weft thread insertion process carried out under the conditions set with the adjustment units as well as the conditions which have changed. The structure allows the operator to check the process control screens 46 and 53 to appropriately determine whether a subsequent reduction in compressed air consumption of the air-jet type loom is possible.

(6) the operating instructions supplied to the operator are provided on the same screen in the form of the values adjusted with the adjustment units, such as the target moment corresponding to the arrival of the weft thread TWm, ie delay threshold TWLim , and the value of the advanced supply control Tma, and measurement values, such as the most delayed moment corresponding to

BE2017 / 5081 the arrival of the weft thread. TWLat and the number of missing picks. This allows the operator to easily understand the background of the operating instructions.

The embodiments can be modified as indicated below.

Both in the case where the TWLim delay threshold in the advanced feed control has not been changed taking into account the missing picks and in the case where the TWLim delay threshold has been changed taking into account the missing picks, the target moment corresponding to the arrival of the weft thread TWm, ie delay threshold TWLim, and the value of the advanced supply control Tma which are set as initial values are not limited to the values used in ies embodiments which have been described above. These values can be changed depending on the type of fabric to be woven and depending on the weaving conditions.

In Table 1, an example is shown in which the delay threshold TWLim has been changed taking account of the missing picks and in which a sampling is carried out for two hours with the target moment corresponding to the arrival of the weft thread TWm, the TWLim delay threshold, and the value of the advanced supply command Tma which differ from the previous example.

BE2017 / 5081

Table 1

Step 1 2 3 4 TW 240 245 250 250 TWLim 260 265 270 265 Tma 0 15 15 30 TWLat 265 265 270 265 Number of missing picks (pick / hour) 0.5 0.5 3 0.5 Sampling value (hour) 2 hours 2 hours 2 hours 2 hours Message displayed E F G VS E: set the value of the feed and TWLim command by 5 °; F: maintain the current value of the TWm and TWLim values of 5 °; G: increase in missing picks. F advanced FF to 30 ° and advance the TWLim C value: recovery of the TWm value completed. (FF has reached the limit) advanced FF 15 ° and delay TWm values FF advanced feed command and delay set the value of the feed control by 5 °; .a value of the advanced power control

Controller C executes the flowcharts of FIGS. 16 and 5 17 under the conditions indicated in step 1 in table 1, that is to say with a target moment corresponding to the arrival of the weft thread TWm which is equal to 240 °, a delay threshold TWLim which is equal to 260 °, and a value of the advanced supply control Tma which is equal to 0 °. When the most delayed moment corresponding to the arrival of the TWLat weft thread is equal to 265 ° and when the quantity of missing picks amounts to 0.5 pick / hour in step S4, the process proceeds as indicated below. After steps S2 to S4 and depending on the decision in step $ 5, the process goes through steps S6, S16, S8 and S9 and increases the value of the advanced feed command Tma up to 15 °. Then, the process goes through steps S2 to S6, SI 6, $ 8 and S9 and increases the value of the advanced supply control Tma up to 30 °. The process goes through steps $ 2 to S6, SI 6 and SI 7 with these conditions and then crosses steps SI02, SI03 and SI04 with a

BE2017 / 5081 target moment corresponding to the arrival of the weft thread TWm which is equal to 240 °, a delay threshold TWLim which is equal to 260 °, and a value of the advanced supply control Tma equal to 30 °. Then, sampling in step SI04 gives rise to the obtaining of a moment corresponding to the arrival of the weft thread TWLat which is equal to 265 ° and of a quantity of missing picks which amounts to 0 , 5 picks / hour. The process then goes through steps SI05 to SI 12 and displays the message "Set the value of the advanced feed command FF to 15 ° and delay the TWm and TWLim values by 5 °", which corresponds to point E. The message from point E 10 o'clock from the message from point E "Advance the TWm value by 5 °" of the previous embodiment which is represented in FIG. 17. Thus, in step SI 13, we delay both the target moment corresponding to the arrival of the weft thread TWm and the delay threshold TWLÎm of 5 °.

After step SI 13, the controller C goes through step 2 as indicated in table 1 with a target moment corresponding to the arrival of the weft thread TWm which is equal to 245 °, a value of the supply command. advanced Tma equal to 15 °, and a TWLim delay threshold of 265 °. After steps S2 to S4 and the decision made in step S5, the process goes through steps S10, SI 1 and SI2 and then crosses step $ 2 with a target moment corresponding to the arrival of the fi! of frame TWm which is equal to 250 °, a delay threshold TWLim equal to 265 °, and a value of the advanced supply control Tma of 30 °. After steps S3 to $ 5, $ 10 and SI7, the process goes through steps S102 to S104, and sampling in step $ 104 gives rise to a quantity of missing picks amounting to 0.5 pick / hour. Then, the process goes through steps SI05 to SI07 and displays the message "Maintain the

BE2017 / 5081 current value of the advanced feed control FF and delay the TWm and TWLim values by 5 ° ", which corresponds to point F. This message from point F differs from the message from point F" Delay the TWLim value by 5 ° "of the previous embodiment which is represented in FIG. 16.

After step S108, the controller C goes through step 3 as indicated in table 1 with a target moment corresponding to the arrival of the weft thread TWm which is equal to 250 °, a value of the advanced feed command Tma equal to 15 °, and a TWLim delay threshold of 270 °. The process takes place in steps S2 to S4, and the sampling in step S4 gives rise to the most delayed moment corresponding to the arrival of the weft thread TWLat which is equal to 270 °. The process goes through steps S10 and SI 7, following the decision taken in step S5 and then goes through steps SI02 to SI04, and the sampling in step SI04 gives rise to obtaining a moment the most delayed corresponding to the arrival of the TWLat weft yarn which is equal to 270 ° and a quantity of missing picks amounting to 3 picks / hour. The process proceeds to steps S106, S109 and S110, following the decision made in step SI05 and displays the message "Increasing the number of missing picks. Set the value of the FF direct action command to 30 ° and advance the TWLim value by 5 ° ", which corresponds to point G. This message from point G differs from the message from point G" Recovery of TWLim value completed "by the previous embodiment that Ton represents in FIG. 16.

Controller C then goes through step 4 as indicated in table 1 with a target moment corresponding to the arrival of the weft thread TWm of 250 °, a value of the advanced feed command Tma of 30 °, and a TWLim delay threshold of

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265 °. The process passes steps S2 to S4, and the sampling in step S4 gives rise to the obtaining of a most delayed moment corresponding to the arrival of the fi! TWLat frame which is equal to 265 °. The process passes steps SI0 and SI 7, following the decision taken in step S5 and displays the message “Recovery of the TWLim value completed. (The value of the FF advanced feed command has reached the limit) ", which corresponds to point C. Then, the air jet type loom begins weaving with a target moment corresponding to the arrival of the weft thread TWm equal to 250 °, a value of the advanced supply control Tma equal to 30 °, and a delay threshold TWLim of 265 °. During weaving, the controller C samples the weft thread insertion data and identifies a quantity of missing picks which amounts to 0.5 picks / hour.

The target moment corresponding to the arrival of the weft thread

TWm, the delay threshold TWLim, and the value of the advanced supply control Tma adjusted in the setting field of the target moment corresponding to the arrival of weft thread 43a, in the setting field of the delay threshold 43b, and in the setting field for the value of the advanced power control 43c need not necessarily be displayed on the control panel 40. For example, the target moment corresponding to the arrival of the weft thread TWm, the threshold TWLim delay, and the value of the advanced power command Tma which are entered

5 with a value input unit, which acts as a control unit, can be stored in memory 36, and a display unit which displays the set values can be omitted.

The sampling value is not limited to 1,000 picks or two hours. For example, the sampling value can be

BE2017 / 5081 changed taking into account the conditions of fabric (ie type of fabric) or the conditions of weaving.

The reference value for missing picks is not limited to 2 picks / hour.

The adjustment unit is not limited to its structure in which the operator directly enters the values to be adjusted. For example, the memory 36 of the controller C can store values relating to the target moment corresponding to the arrival of the weft thread TWm, ie delay threshold TWLim, and the value of the advanced supply command Tma, which are associated with various fabric conditions (various types of fabrics) and various weaving conditions.

Furthermore, the memory 36 of the controller C can store adjusted values linked to the sampling value and to the reference concerning the missing picks, which are associated with various fabric conditions (various types of fabrics) and with various conditions. and the appropriate setting values can be set when the operator sets fabric conditions and weaving conditions.

Default values concerning the target moment corresponding to the arrival of the weft thread TWm, the delay threshold TWLÎm, the value of the advanced feed control Tma, the sampling value, and the reference concerning the missing picks can be preset, and the operator can change the preset values if necessary.

In the flowchart for the recovery of the target moment corresponding to the arrival of the weft thread TWm, the change value that is used when increasing or decreasing the value of the target moment corresponding to the arrival of the wire

BE2017 / 5081 of TWm frame or TWLim delay threshold based on a comparison between the most delayed moment corresponding to the arrival of the TWLat weft thread and the TWLim delay threshold is not limited to 5 °. The change value can be greater or less than 5 °.

In the flowchart for the recovery of the target moment corresponding to the arrival of the weft thread TWm, the change value which is used when increasing or decreasing the value of the advanced supply control Tma in based on a comparison between the most delayed moment corresponding to the arrival of the weft thread TWLat and the delay threshold TWLim is not limited to 15 °. The change value can be greater or less than 15 °.

When the target moment corresponding to the arrival of the weft thread TWm is changed, the value of the advanced supply command Tma is the delay threshold TWLim in the flowchart for retrieving the target moment corresponding to the arrival of the TWm weft thread, instead of displaying change instructions for the operator on the screen in such a way that the operator performs the change operation corresponding to the instructions, the controller C can change the values of automatically.

When the target moment corresponding to the arrival of the weft thread TWm is adjusted by taking account of the missing picks, a pilot lamp may be provided in such a way that the operator is informed of the fact that operating instructions are given. after the implementation of a sampling during the predetermined period of time after having terminated the "If; TWm value recovery program ”. Thus, the operator is allowed to implement the necessary operation without delay.

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The setting screens 42 and 50 can be omitted. In any case, the setting screens 42 and 50 are advantageous since they allow the operator to check whether the set values are correct.

The process control screens 46 and 53 can be omitted. In any case, the process control screens 46 and 53 are advantageous since they allow the operator to appropriately determine whether the compressed air consumption of the loom of the type jet can be further reduced.

Controller C can only be configured to be activated to set a target moment corresponding to the arrival of the TWm weft without taking into account the missing picks. The controller C does not necessarily have the function of setting a target moment corresponding to the arrival of the weft thread TWm by taking into account the missing picks.

The tandem nozzle 13 can be omitted.

BE2017 / 5081

Claims (5)

1. Method for controlling an insertion of weft thread in an air jet type loom which includes a main nozzle (12} for the insertion of the weft thread and a secondary nozzle (14} for the insertion of weft thread and which inserts a weft thread (Y) using an air jet from the main nozzle (12) and the secondary nozzle (14), the method comprising the fact of: detecting a state of the weft thread (Y) before insertion, with a detector of the state of the weft thread (18); execute an advanced supply control (FF) which increases an amount of air jet from the main nozzle (12) when a time corresponding to the arrival of the weft thread (TW) predicted from the weft state (Y), which is detected with the weft state detector (18), is delayed relative to a delay threshold (TWLÎm); and delaying a target moment corresponding to the arrival of the weft yarn (TWm) in a range in which the advanced feed control (FF) can maintain the moment corresponding to the arrival of the weft yarn (Tm) advanced relative at the delay threshold (TWLÎm). 2. Method for controlling an insertion of weft thread in an air jet type loom according to claim 1, characterized in that the method further comprises: checking a rate of missing picks after the implementation of a weft thread insertion for a predetermined period of time with the target moment corresponding to the arrival of the weft thread (TWm); and BE2017 / 5081 delay the delay threshold (TWKim) when the rate of missing picks is lower than a predetermined rate. 3. Weft thread insertion controller (C) in an air jet type loom which includes a main nozzle (12) for 5 inserting the weft thread and a secondary nozzle (14) for inserting the weft thread, which inserts a weft thread (Y) using an air jet from the main nozzle (12) and of the secondary nozzle (14), detects a state of the weft thread (Y) before insertion, with a detector of the state of the weft thread (18), and executes a command 10 advanced feed (FF) which increases an amount of air jet from the main nozzle (12) when a time corresponding to the arrival of the weft thread (TW) predicted from the detected state weft thread (Y) is delayed with respect to a delay threshold (TWLim), characterized in that the weft insertion controller (C) 15 includes: an adjustment unit which adjusts a target moment corresponding to the arrival of the weft thread (TWm), Se delay threshold of the moment corresponding to the arrival of the weft thread (TWLim), and a value of the supply control advanced (TMa); 20 a control unit for changing the value of the advanced power control (TMa) which changes the value of the advanced power command based on a comparison between the delay threshold (TWLim) and a most delayed corresponding to the arrival of the weft thread (TWLat), which is the 25 more delayed in an insertion of the weft thread implemented under controlled conditions, which are regulated with the adjustment unit; and a control unit for changing a target moment corresponding to the arrival of the weft thread (TWm) which delays the target moment corresponding to the arrival of the weft thread (TWm) in BE2017 / 5081 a range in which the advanced feed control (FF) can maintain the most delayed moment corresponding to the arrival of the advanced weft thread (TWLat) relative to the delay threshold (TWLim ,. 5 4. Weft thread insertion controller (C) in an air jet type loom according to claim 3, further comprising an adjustment screen (42) which displays a unit adjustment result. adjustment. 5. Weft thread insertion controller (C) in an air jet type loom according to claim 3 or 4, further comprising a process control screen (46) which displays the process of d insertion of weft yarn used under the conditions set with the adjustment unit and under conditions which have changed. BE2017 / 5081