EP3567145B1 - Method of controlling weft insertion of air jet loom - Google Patents

Method of controlling weft insertion of air jet loom Download PDF

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Publication number
EP3567145B1
EP3567145B1 EP19171713.1A EP19171713A EP3567145B1 EP 3567145 B1 EP3567145 B1 EP 3567145B1 EP 19171713 A EP19171713 A EP 19171713A EP 3567145 B1 EP3567145 B1 EP 3567145B1
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EP
European Patent Office
Prior art keywords
weft yarn
weft
arrival timing
timing
holding pin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP19171713.1A
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German (de)
English (en)
French (fr)
Other versions
EP3567145A1 (en
Inventor
Masataka Hamaguchi
Taijirou Okuda
Carsten Meder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Industries Corp
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Toyota Industries Corp
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Publication date
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Publication of EP3567145A1 publication Critical patent/EP3567145A1/en
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    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D51/00—Driving, starting, or stopping arrangements; Automatic stop motions
    • D03D51/007—Loom optimisation
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3066—Control or handling of the weft at or after arrival
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/28—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed
    • D03D47/30—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms wherein the weft itself is projected into the shed by gas jet
    • D03D47/3066—Control or handling of the weft at or after arrival
    • D03D47/3073—Detection means therefor
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • D03D47/363—Construction or control of the yarn retaining devices

Definitions

  • the present disclosure relates to a method of controlling weft insertion of an air jet loom.
  • a technique regarding an air jet loom in which weft yarns are inserted by utilizing compressed air is disclosed, for example, in Published Japanese Translation No. 2014-500914 of PCT International Application No. PCT/CH2011/000284 .
  • a weft insertion is controlled using a feed-forward control on the basis of the characteristics of the weft yarn that is yet to be inserted.
  • the characteristics of the weft yarn that is yet to be inserted is detected by means of a sensor and the air pressure or the duration of opening of a nozzle is calculated based on the detected characteristics of the weft yarn to thereby control the weft insertion.
  • a weft yarn is transferred to a specified position using air injected from weft yarn nozzles.
  • the weft yarn arrival timing at which the weft yarn transferred by the air arrives at a specified position may be too early or too late and such early arrival or late arrival the weft yarn may result in a weft insertion failure.
  • the feed-forward control when the predicted weft yarn arrival timing that is predicted prior to the actual weft insertion is deviated from the target weft yarn arrival timing, such deviation needs to be corrected by modifying the weft insertion condition.
  • the air pressure of a nozzle or the duration of opening of the nozzle is calculated.
  • the varying manner of the weft yarn arrival timing after the duration of opening of the nozzle is modified varies depending on the type of the weft yarn (material and yarn count). Furthermore, even the weft yarn arrival timing of a fixed type of weft yarn also varies depending on the air pressure of the nozzle used for the weft insertion. As the reason for such varying weft yarn arrival timing, the influences of the duration of opening of the nozzle and the air pressure of the nozzle on the transfer speed of the weft yarn are considered. For example, how the transfer speed of the weft yarn varies after the duration of opening of the nozzle is modified depends on the type of the weft yarn and the air pressure of the nozzle.
  • EP 0 222 410 A1 discloses a picking operation control method for controlling the picking operation of a picking device comprising a measuring and storing drum around which a weft yarn is wound for temporary storage, a restraining pin which is advanced for restraining the weft yarn on the measuring and storing drum and is retracted for releasing the weft yarn from the measuring and storing drum, and a picking nozzle for picking the weft yarn stored on the measuring and storing drum into the shed when the weft yarn is released, which comprises: detecting an actual arrival crankshaft angle at which a specified part of the picked weft yarn passes a predetermined position other than a final arrival position; comparing the actual arrival crankshaft angle with a reference arrival crankshaft angle; changing at least either a crankshaft angle at which the restraining pin is retracted or a crankshaft angle at which the picking nozzle is actuated, on the basis of the result of the comparison; and controlling either the restraining pin or the picking nozzle so
  • WO 2012/068697 A2 discloses a method for controlling a jet loom.
  • the jet loom contains a plurality of relay nozzles arranged along a fluid feed conduit.
  • a weft yarn is introduced into the fluid feed conduit, the relay nozzles are actuated so as to eject time-staggered fluid pulses which produce a fluid flow in the fluid feed conduit, and the weft yarn is conveyed by the fluid flow through the fluid feed conduit.
  • the relay nozzles are actuated based on a local distribution of characteristics within the respectively conveyed weft yarn section.
  • the present disclosure has been made to solve the above problem, and is directed to providing a method of controlling weft insertion of an air jet loom that simplifies the calculations for weft insertion that uses the feed-forward control.
  • FIG. 1 is a schematic view illustrating a configuration of a weft insertion apparatus, denoted as 1, of an air jet loom according to an embodiment of the present disclosure.
  • the weft insertion apparatus 1 includes a weft yarn cheese 2, a weft yarn characteristics detection unit 3, a weft yarn storing unit 4, a weft yarn tension correcting unit 5, a main nozzle 6, a tandem nozzle 7, sub-nozzles 8, a reed 9 for beating, and a weft yarn feeler 10.
  • the weft insertion apparatus 1 further includes a main valve 12, a tandem valve 14, a main tank 16, a regulator 18, sub-valves 22, a sub-tank 23, a regulator 24, a control unit 31, and a function panel 32.
  • the weft yarn cheese 2 operates as the yarn feeding unit that feeds a weft yarn 11 to be inserted to the weft yarn storing unit 4.
  • the weft yarn characteristics detection unit 3 is configured to detect characteristics of the weft yarn 11 supplied from the weft yarn cheese 2. The characteristics of the weft yarn 11, which are the detection result of the weft yarn characteristics detection unit 3, are notified or sent to the control unit 31.
  • the weft yarn characteristics detection unit 3 is disposed between the weft yarn cheese 2 and the weft yarn storing unit 4 in a direction in which the inserted weft yarn 11 is transferred (the weft insertion direction).
  • the weft insertion is performed at a position downstream of the weft yarn storing unit 4 in the weft insertion direction.
  • the weft yarn characteristics detection unit 3 is disposed at a position upstream of the weft yarn storing unit 4. Accordingly, the weft yarn characteristics detection unit 3 detects the characteristics of the weft yarn 11 that is yet to be inserted.
  • the characteristics of the weft yarn 11 detected by the weft yarn characteristics detection unit 3 include, at least, a mass of the weft yarn 11 per unit of length (hereinafter, referred to as the weft yarn mass).
  • the weft yarn mass When a weft yarn 11 is inserted by means of injection of air, the characteristics of the weft yarn 11 influences the flight of the weft yarn 11.
  • the weft yarn characteristics detection unit 3 include a device disclosed in Published Japanese Translation No. 2014-500914 of PCT International Application No. PCT/CH2011/000284 .
  • the weft yarn storing unit 4 is configured to store a weft yarn that is yet to be inserted.
  • the weft yarn storing unit 4 includes a measuring drum 15 and a holding pin 17.
  • the weft yarn 11 that is to be supplied from the weft yarn cheese 2 to the weft yarn storing unit 4 is wound around the measuring drum 15 and stored in the weft yarn storing unit 4.
  • the holding pin 17 is a pin configured to hold and release the weft yarn 11 for weft insertion.
  • the holding pin 17 is caused to operate in accordance with the driving of the electromagnetic solenoid 19.
  • the control unit 31 controls the driving of the electromagnetic solenoid 19.
  • the operating state of the holding pin 17 is switchable by the control of the driving of the electromagnetic solenoid 19 by the control unit 31.
  • the operating state of the holding pin 17 includes a first operating state and a second operating state that will be described later in detail.
  • the first operating state of the holding pin 17 herein refers to the state in which the holding pin 17 is caused to extend in a direction approaching an outer peripheral surface of the measuring drum 15 by driving the electromagnetic solenoid 19, so that the holding pin 17 holds the weft yarn 11 (hereinafter, referred to as the holding state), as depicted in FIG. 2 .
  • the holding state the weft yarn 11 is held on the outer peripheral surface of the measuring drum 15 so that the weft yarn 11 wound around the measuring drum 15 is not let off toward the tandem nozzle 7.
  • the second operating state of the holding pin 17 herein refers to the state in which the extended holding pin 17 is lifted or retracted in a direction separating from the outer peripheral surface of the measuring drum 15 by driving the electromagnetic solenoid 19, so that the holding state of the holding pin 17 holding the weft yarn 11 is released (hereinafter, referred to as the release state), as depicted in FIG. 3 .
  • the release state the holding state of the holding pin 17 holding the weft yarn 11 is released.
  • a balloon sensor 20 is disposed in the vicinity of the measuring drum 15.
  • the balloon sensor 20 is configured to detect a balloon formed in the weft yarn 11 that is released from the holding pin 17 and let off from the measuring drum 15, and outputs or sends the detection result in a form of an electric signal to the control unit 31.
  • the weft yarn tension correcting unit 5 is configured to correct the tension applied to the weft yarn 11 so that an excessive tension is not applied to the weft yarn 11.
  • the main nozzle 6, the tandem nozzle 7, and the sub-nozzles 8 are provided as the weft insertion nozzles of the present disclosure that inject air for weft insertion so as to transfer the weft yarn 11 in the weft insertion direction.
  • the main nozzle 6 is disposed downstream of the tandem nozzle 7 in the weft insertion direction, and the sub-nozzles 8 are disposed downstream of the main nozzle 6 in the weft insertion direction.
  • one main nozzle 6, one tandem nozzle 7, and a plurality of sub-nozzles 8 are provided.
  • the main nozzle 6 is connected to the main tank 16 via the main valve 12.
  • the tandem nozzle 7 is connected to the main tank 16 via the tandem valve 14.
  • the main tank 16 is also connected with the regulator 18.
  • the regulator 18 is configured to adjust the pressure of compressed air compressed by an air compressor (not shown). The compressed air with the adjusted pressure adjusted by the regulator 18 is stored in the main tank 16. Part of the compressed air stored in the main tank 16 is supplied to the main nozzle 6 via the main valve 12, and part of the compressed air stored in the main tank 16 is supplied to the tandem nozzle 7 via the tandem valve 14.
  • the main nozzle 6 is configured to inject/stop injecting air in response to the opening/closing of the main valve 12.
  • the tandem nozzle 7 is configured to inject/stop injecting air in response to the opening/closing of the tandem valve 14. Specifically, when the main valve 12 is open, air is injected from the main nozzle 6, and when the main valve 12 is closed, the injection of air is stopped. Similarly, when the tandem valve 14 is open, air is injected from the tandem nozzle 7, and when the tandem valve 14 is closed, the injection of air is stopped.
  • the main valve 12 and the tandem valve 14 are respectively electrically connected to the control unit 31.
  • the control unit 31 controls the opening/closing of the main valve 12 and the opening/closing of the tandem valve 14 individually.
  • the main valve 12 and the tandem valve 14 are opened at their respective specified timings to inject compressed air from the main nozzle 6 and the tandem nozzle 7.
  • breeze air is kept flowing from the main nozzle 6 and the tandem nozzle 7 until the next picking (weft insertion). With the breeze air, the posture of the weft yarn 11 is maintained horizontally in a segment of the weft path between the tandem nozzle 7 and a point immediately before the reed 9.
  • the holding pin 17 holding the weft yarn 11 that is wound around the measuring drum 15 is lifted by driving the electromagnetic solenoid 19, the weft yarn 11 is released and transferred to the downstream side by the air injected from the main nozzle 6 and the tandem nozzle 7.
  • the lifting timing of the holding pin 17 at which the holding pin 17 is lifted and the weft insertion start timing occur substantially at the same time.
  • the plurality of sub-nozzles 8 are disposed at specified intervals in the weft insertion direction.
  • the weft yarn 11 that is let off with the air injected from the main nozzle 6 and the tandem nozzle 7 is transferred along a longitudinal direction of the reed 9 with the aid of air injected from the respective sub-nozzles 8.
  • the reed 9 is configured to perform a beating operation per one picking (weft insertion) of the weft yarn 11.
  • a cutter 21 is disposed between the main nozzle 6 and the reed 9.
  • the cutter 21 is configured to perform a cutting operation of the weft yarn 11 per one weft insertion, i.e., per one picking, of the weft yarn 11.
  • the control unit 31 controls the driving of the cutter 21.
  • the plurality of sub-nozzles 8 are divided into six equal groups, where each group consists of four sub-nozzles 8 that are adjacent to each other in the longitudinal direction of the reed 9.
  • the number of groups of the sub-nozzles 8 may vary depending on the selected weaving width.
  • the number of the sub-valves 22 corresponds to the number of the groups of the sub-nozzles 8, and each sub-nozzle 8 is connected to the sub-tank 23 via its corresponding sub-valve 22.
  • the sub-tank 23 is also connected with the regulator 24.
  • the regulator 24 is configured to adjust the pressure of compressed air compressed by the aforementioned air compressor (not shown).
  • the compressed air with the adjusted pressure adjusted by the regulator 24 is stored in the sub-tank 23.
  • the compressed air stored in the sub-tank 23 is distributed to the respective groups of the sub-nozzles 8 via the sub-valves 22 and supplied to the respective sub-nozzles 8.
  • each sub-nozzle 8 injects/stops injecting air in response to the opening/closing of the corresponding sub-valve 22. Specifically, in each group of the sub-nozzles 8, when the corresponding sub-valve 22 is open, air is injected from the sub-nozzles 8, and when the sub-valve 22 is closed, the injection of air is stopped.
  • the weft yarn feeler 10 is configured to determine whether the inserted weft yarn 11 has arrived at a specified position in the weft insertion direction or not.
  • the specified position herein is a position near the terminal point of a weft insertion and away from the main nozzle 6, in the longitudinal direction of the reed 9 (in the weft insertion direction).
  • the specified position is predetermined in accordance with the weaving width of a fabric to be woven.
  • the weft yarn feeler 10 is formed by an optical sensor or the like.
  • the weft yarn 11 is inserted and transferred in the longitudinal direction of the reed 9 by the air injected from the weft insertion nozzles 6, 7, and 8.
  • the weft yarn feeler 10 senses the arrival of the weft yarn 11 and outputs a detection signal.
  • the weft yarn arrival timing at which the weft yarn 11 arrives at the specified position corresponds to the timing when the weft yarn feeler 10 outputs a detection signal.
  • the control unit 31 is also configured to control the operation of the weft insertion apparatus 1.
  • the control unit 31 includes, for example, a central processing unit (CPU), a read-only memory (ROM), and a random-access memory (RAM).
  • the control unit 31 uses the feed-forward control for the weft insertion of the weft yarn 11. The feed-forward control by the control unit 31 will be described in detail later.
  • the function panel 32 is connected to the control unit 31 as the input/output device for various data associated with weft insertion.
  • the function panel 32 includes, for example, a display and input keys (not shown).
  • the display device is configured to display a setting screen. Settings for the weft insertion are set on the setting screen, and, based on the settings, the control unit 31 controls the weft insertion of the weft yarn 11 using the feed-forward control.
  • the setting is made by an operator. The operator enters the yarn type of the weft yarn 11 for weft insertion (material, yarn count) on the setting screen displayed on the display device. It is to be noted that data entered via the function panel 32 is not limited to the yarn type of the weft yarn 11, and includes other data, for example, data for specifying setting values for the weaving width of the woven fabric.
  • step S1 characteristics of the weft yarn 11 that is yet to be inserted are detected.
  • the weft yarn 11 to be inserted is supplied from the weft yarn cheese 2 to the weft yarn storing unit 4.
  • the characteristics of the weft yarn 11 are detected by the weft yarn characteristics detection unit 3 at a position in a path along which the weft yarn 11 is supplied.
  • the characteristics of the weft yarn 11 detected by the weft yarn characteristics detection unit 3 are notified or sent to the control unit 31. With this operation, the control unit 31 identifies the characteristics of the weft yarn 11 that is yet to be inserted. In the present exemplary embodiment, although the weft yarn characteristics detection unit 3 detects the weft yarn mass and sends the detection result to the control unit 31.
  • step S2 a weft yarn arrival timing at which the weft yarn 11 that is inserted in accordance with a specified weft insertion condition arrives at the specified position in the weft insertion direction is predicted, on the basis of the characteristics of the weft yarn 11 detected in the previous step S1.
  • the control unit 31 performs the prediction of the weft yarn arrival timing.
  • specified weft insertion conditions for each of the yarn types of the weft yarns 11 are registered beforehand.
  • the CPU of the control unit 31 selects a weft insertion condition that corresponds to the yarn type of the weft yarn 11 to be inserted from the weft insertion conditions registered in the memory, reads out the selected weft insertion condition, and then predicts the weft yarn arrival timing using the read out weft insertion condition.
  • the weft insertion conditions include the pressure of the main tank 16, the pressure of the sub-tank 23, the duration of air injection of the main nozzle 6, the duration of air injection of the tandem nozzle 7, the air injection start timing of the main nozzle 6, and the air injection start timing of the tandem nozzle 7.
  • the pressure of the main tank 16 and the pressure of the sub-tank 23 correspond to the aforementioned air pressure
  • the duration of air injection of the main nozzle 6 and the duration of air injection of the tandem nozzle 7 correspond to the aforementioned duration of opening of the nozzle.
  • the weft yarn arrival timing predicted by the control unit 31 is herein referred to as TWp.
  • the control unit 31 predicts the weft yarn arrival timing TWp on the basis of the characteristics of the weft yarn 11 detected by the weft yarn characteristics detection unit 3.
  • the weft yarn characteristics detection unit 3 detects the weft yarn mass.
  • the control unit 31 predicts the weft yarn arrival timing TWp in accordance with the weft yarn mass detected by the weft yarn characteristics detection unit 3. The details of the prediction of the weft yarn arrival timing TWp will be described below.
  • the control unit 31 predicts that the weft yarn arrival timing TWp is later than the target weft yarn arrival timing TWr.
  • the control unit 31 predicts that the weft yarn arrival timing TWp will be advanced and earlier than the target weft yarn arrival timing TWr.
  • the difference between the target weft yarn arrival timing TWr and the predicted weft yarn arrival timing TWp predicted by the control unit 31 is determined from the difference between the reference weft yarn mass and the detected weft yarn mass. In other words, as the difference between the reference weft yarn mass and the detected weft yarn mass is greater, the difference between the reference weft yarn arrival timing TWr and the predicted weft yarn arrival timing TWp is greater.
  • the aforementioned reference weft yarn mass is predetermined for each of the yarn types of the weft yarns 11 and prestored in the memory of the control unit 31 (such as the RAM) as data.
  • the CPU of the control unit 31 selects a reference welt yarn mass from the memory and reads out for use.
  • step S3 a difference or deviation between the predicted weft yarn arrival timing TWp that is predicted in the previous step S2 (hereinafter, simply referred to as the predicted arrival timing TWp) and the target weft yarn arrival timing TWr (hereinafter, simply referred to as the target arrival timing TWr) is determined.
  • the control unit 31 performs the processing of Step S3.
  • the target arrival timing TWr is set to a timing at which the loom is at a specified crank angle in the range from 0 to 360 degrees.
  • the control unit 31 confirms whether the predicted arrival timing TWp is advanced or delayed relative to the target arrival timing TWr, and determines the difference or deviation from the target arrival timing TWr.
  • the control unit 31 recognizes the target arrival timing TWr and the predicted arrival timing TWp as their corresponding loom crank angles.
  • the difference ⁇ between the predicted arrival timing TWp and the target arrival timing TWr is calculated using the above equation.
  • the control unit 31 recognizes the difference ⁇ is -5°.
  • the control unit 31 recognizes the difference or deviation ⁇ is +3°.
  • the predicted arrival timing TWp and the target arrival timing TWr are recognized as their corresponding loom crank angles.
  • the predicted arrival timing TWp and the target arrival timing TWr may be recognized by the time elapsed since a given loom crank angle is reached.
  • step S4 a lifting timing of the holding pin 17 is modified in accordance with the difference or deviation in the weft yarn arrival timings calculated in the previous step S3.
  • the holding pin 17 is retracted and lifted at the modified lifting timing and a weft insertion of the weft yarn 11 is performed.
  • the control unit 31 performs the modification of the lifting timing of the holding pin 17, and the lifting of the holding pin 17 is controlled by the driving of the electromagnetic solenoid 19 by the control unit 31.
  • Weft insertion of the weft yarn 11 is performed using the air injected form the weft insertion nozzles 6, 7, and 8, and the injection of air from the weft insertion nozzles 6, 7, and 8 is controlled by controlling the opening/closing of the valves 12, 14, and 22, respectively by the control unit 31. It is to be noted that the weft yarn 11 that is yet to be inserted is maintained in the holding state by the holding pin 17 until the holding pin 17 is lifted in step S4.
  • the weft insertion conditions to be applied to the prediction of the weft yarn arrival timing TWp include the pressure of the main tank 16, the pressure of the sub-tank 23, the duration of air injection of the main nozzle 6, the duration of air injection of the tandem nozzle 7, the air injection start timing of the main nozzle 6, and the air injection start timing of the tandem nozzle 7, or the like.
  • each and every of these weft insertion conditions has an influence on the transfer speed of the weft yarn 11.
  • the control unit 31 modifies and moves the lifting timing of the holding pin 17 to the reverse side by the same amount as the amount of the difference or deviation between the predicted arrival timing TWp and the target arrival timing TWr.
  • Moving the lifting timing of the holding pin 17 to the reverse side herein refers to moving the lifting timing of the holding pin 17 in a direction opposite to the direction of deviation of the predicted arrival timing TWp from the target arrival timing TWr.
  • the lifting timing of the holding pin 17 is moved to the delayed side that is opposite to the direction of the deviation
  • the lifting timing of the holding pin 17 is moved to the advanced side that is opposite to the direction of the deviation
  • the control unit 31 drives the electromagnetic solenoid 19 in accordance with the modified lifting timing of the holding pin 17 to retract the holding pin 17.
  • the holding state of the weft yarn 11 is released at the same time of the lifting of the holding pin 17.
  • the weft yarn 11 that is wound around the measuring drum 15 is let off toward the tandem nozzle 7 at the same time of the lifting of the holding pin 17.
  • the weft yarn 11 that is let off from the measuring drum 15 is transferred and inserted in the longitudinal direction of the reed 9 by the air injected from the weft insertion nozzles 6, 7, and 8.
  • the lifting timing of the holding pin 17 is modified in accordance with the difference or deviation between the predicted arrival timing TWp and the target arrival timing TWr, and the holding pin 17 is retracted in accordance with the modified lifting timing.
  • the lifting timing of the holding pin 17 does not influence the transfer speed of the weft yarn 11.
  • the lifting timing of the holding pin 17 is a factor that determines the weft insertion start timing. Therefore, by modifying the lifting timing of the holding pin 17, the deviation of the weft yarn arrival timing may be corrected without modifying the transfer speed of the weft yarn 11.
  • the lifting timing of the holding pin 17 may be modified using the same equation.
  • the calculation for the weft insertion with the feed-forward control may be simplified.
  • the amount of data required for the feed-forward control may be reduced.
  • the weft yarn mass is exemplified as a characteristic of the weft yarn 11 to be detected by the weft yarn characteristics detection unit 3, the characteristics of the present disclosure is not limited thereto.
  • the thickness or fluffiness of the weft yarn which may influence the flight of a weft yarn, if any, may be detected by the weft yarn characteristics detection unit 3 and then be used by the control unit 31 for the feed-back control of the weft insertion.
  • control unit 31 modifies the lifting timing of the holding pin 17 by the same amount as the amount of the difference or deviation between the predicted arrival timing TWp and the target arrival timing TWr.
  • the configuration of the present disclosure is not limited thereto.
  • the control unit 31 may multiply the amount of the deviation between the predicted arrival timing TWp and the target arrival timing TWr by a predetermined coefficient and modify the lifting timing of the holding pin 17 by the amount corresponding to the value obtained by the multiplication.
  • a method of controlling weft insertion of an air jet loom that includes a holding pin (17) configured to hold and release a weft yarn (11), and a weft insertion nozzle (6, 7, 8) that injects air is provided.
  • the method includes the steps of: detecting a characteristic of the weft yarn (11) that is yet to be inserted; predicting a weft yarn arrival timing at which the weft yarn (11) inserted in accordance with a specified weft insertion condition arrives at a specified position in a weft insertion direction, on the basis of the detected characteristic of the weft yarn (11); determining a difference between the predicted weft yarn arrival timing (TWp) and a target weft yarn arrival timing (TWr); modifying a lifting timing of the holding pin (17) in accordance with the determined difference; and lifting the holding pin (17) at the modified lifting timing to insert the weft yarn (11).

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Looms (AREA)
EP19171713.1A 2018-05-08 2019-04-30 Method of controlling weft insertion of air jet loom Active EP3567145B1 (en)

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JP2018090159A JP7368075B2 (ja) 2018-05-08 2018-05-08 エアジェット織機における緯入れ制御方法

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EP3567145A1 EP3567145A1 (en) 2019-11-13
EP3567145B1 true EP3567145B1 (en) 2021-02-24

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JP2019196557A (ja) 2019-11-14
EP3567145A1 (en) 2019-11-13
CN110453344B (zh) 2021-03-16
CN110453344A (zh) 2019-11-15

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