JP6190250B2 - Weft detection device for air jet loom - Google Patents

Description

  The present invention relates to a weft detection device for an air jet loom, and more particularly to a weft detection device for an air jet loom in which wefts are wefted through an inner corridor by air injection from a main nozzle and a sub nozzle.

  In this type of air jet loom, the weft insertion state greatly depends on the pressure setting of the pressure air. Conventionally, Patent Document 1 proposes a weft insertion pressure control device in a jet loom that can improve the efficiency of jetting fluid consumption while eliminating the weft loosening and weft insertion errors related to the latter half of the weft insertion. In Patent Document 1, the weft unwinding end time and the weft tip end arrival time in the weft length measuring and storage device are detected, and the injection pressure at the main nozzle is controlled based on the weft tip end arrival time. Further, the injection pressure at the main nozzle and the injection pressure at the auxiliary nozzle (sub nozzle) are controlled based on the difference between the weft leading edge arrival time and the weft unwinding end time. Specifically, when the difference between the detected weft tip arrival time and the detected weft unwinding end time is larger than the target value, the injection pressure at the auxiliary nozzle is increased, and the time difference is smaller than the target value. Is controlled to lower the injection pressure at the auxiliary nozzle.

JP-A-4-241135

  When the wefts stored in the weft side length storage device are weft-inserted in a state of flying through the inner passage by air injection from the main nozzle and the sub-nozzle, as shown in FIG. In a state where the weft insertion is completed and reaches a predetermined position, it flies in a state where the portion near the rear end is undulated. At a time near the completion of weft insertion, as shown in FIG. 6B, the wavy state disappears and the weft is inserted in a stretched state.

  With the weft tip arrival time TW, which is the time when the weft tip reaches the end of the weft insertion range, being constant, the sub-nozzle injection pressure (sub pressure), the weft tip arrival time TW, and the weft in the weft side long storage device FIG. 7 shows the relationship between the unwinding end time TBW (TW−TBW) and the time of unwinding. In FIG. 7, the angles of TW and TBW mean the rotation angle of the loom. It can be seen from FIG. 7 that the loom rotation angle at the time of slipping becomes smaller as the sub pressure becomes higher. In other words, if the sub pressure is high, it will be quicker.

  When determining the optimum injection pressure of the sub nozzle at the time of weft insertion, the weft tip arrival time TW, which is the time when the weft tip reaches the end of the weft insertion range, and the weft unwinding end time TBW in the weft side long storage device, The change point of the difference (TW−TBW) is one standard. However, in that case, the condition of the weft in the warp opening is not directly monitored, but is an alternative index. From the value of TW-TBW, which sub-pressure is used to set the time of stretching to an appropriate time. It is not possible to check whether there is enough margin. Therefore, when adjusting the machine base, the sub pressure is set by visually observing the state of the weft using a strobe. However, it may be difficult to confirm the state of the weft in the warp opening with a strobe depending on the woven fabric structure in which the upper warp is continuous, such as a satin weave.

  The present invention has been made in view of the above-mentioned problems, and its purpose is to monitor the state of the weft flying in the inner passage and display the timing at which the weft extends before the weft end arrival time. It is an object of the present invention to provide a weft detection device for an air jet loom.

A weft detection device for solving the above-mentioned problems is a weft detection device for an air jet loom in which wefts are inserted through a inner passage by air injection from a main nozzle and a sub nozzle for weft insertion. An optical sensor for detecting the looseness of the weft on the main nozzle side , and the optical sensor can go in and out of the warp opening from between the rows of warps as the sley swings It is fixed to the sley .

  According to this configuration, it is detected by the optical sensor whether the portion near the rear end of the weft Y that flies through the inner passage is flying in a wavy state or flying in a stretched state. Therefore, it is possible to monitor the state of the weft flying in the inner passage and display the timing at which the weft extends before the weft end arrival time.

It is preferable that the optical sensor detects the looseness of the weft yarn on the downstream side in the weft insertion direction with respect to the sub-nozzle disposed closest to the main nozzle . According to this configuration, from the state of the weft detected by the optical sensor, it is detected by the optical sensor at a location affected by the injection pressure of the main nozzle to determine whether the weft is in a stretched state. This is easier and more accurate than when judging from the state of the weft.

  The optical sensor detects a pulse signal at different timings when detecting a state in which the weft flies in a wavy state and when detecting a state in which the weft flies in a stretched state. Output. According to this configuration, since it is possible to determine whether or not the weft is in the stretched state from the pulse signal output from the optical sensor, it is determined whether or not the weft is in the stretched state from the image of the flying state of the weft. Judgment becomes easier compared to the case. In addition, since the timing at which the pulse interval of the pulse signal output from the optical sensor changes is the weft draw timing, it is also easy to determine the draw timing.

  According to the present invention, it is possible to monitor the state of the weft that flies through the inner passage and to display the timing at which the weft extends before the weft end arrival time.

The schematic diagram of a weft insertion apparatus. The schematic perspective view which shows a main nozzle, a sub nozzle, and a weft sensor. The sectional side view which shows the positional relationship of a cocoon wing and a weft sensor. The schematic diagram which shows the positional relationship of an inner channel | path, a weft, and a light projection / reception part. The schematic diagram which shows the output waveform of a sensor. (A) is a schematic diagram which shows the state of the weft before stretching, (b) is a schematic diagram which shows the state of the weft after stretching. The graph which shows the relationship between sub pressure and a stretched state.

Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the air jet loom includes a main nozzle 11 for weft insertion, a sub nozzle 12 for weft insertion, a collar 13, and a weft length measuring and storing device 14 of a winding type. Yes. As shown in FIG. 2, the main nozzle 11, the sub nozzle 12, and the flange 13 are fixed on the slay 15. The eaves 13 are formed by arranging a plurality of eaves wings 16 having guide recesses 16a (shown in FIG. 3) in the weft insertion direction. A guide passage 17 is formed by the guide recesses 16 a of the plurality of guide blades 16.

  As shown in FIG. 1, the main nozzle 11 is connected to a main nozzle tank 19 connected to an original pressure tank 18 via a pipe line. An electromagnetic opening / closing valve 20 is provided between the main nozzle 11 and the main nozzle tank 19, and pressure air injection for weft insertion in the main nozzle 11 is controlled by opening / closing the electromagnetic opening / closing valve 20. An electric pressure control valve 21 is provided between the main pressure tank 18 and the main nozzle tank 19, and the pressure of the main nozzle tank 19 is adjusted by the pressure control valve 21.

  The sub nozzle 12 is connected to a sub nozzle tank 22 connected to the original pressure tank 18 via a pipe line. Electromagnetic on-off valves 23, 24, 25, and 26 are provided between the sub-nozzle 12 and the sub-nozzle tank 22, and pressure air injection for weft insertion in the sub-nozzle tank 22 is performed on the electromagnetic on-off valves 23, 24, 25, and 26. It is controlled by opening and closing. Each of the electromagnetic open / close valves 23 to 26 controls the supply of compressed air to the plurality of sub-nozzles 12 and is controlled to open / close sequentially so that the so-called relay injection is performed by the plurality of sub-nozzles 12 group. An electric pressure control valve 27 is provided between the original pressure tank 18 and the sub nozzle tank 22, and the pressure of the sub nozzle tank 22 is adjusted by the pressure control valve 27.

  The weft length measuring storage device 14 has a yarn winding surface 14a, and the winding of the weft Y onto the yarn winding surface 14a and the unwinding / unwinding of the weft Y from the yarn winding surface 14a are the locking pins 28a of the electromagnetic solenoid 28. It is controlled by the movement operation. Excitation demagnetization of the electromagnetic solenoid 28 is performed by command control of the control device C, and the control device C controls demagnetization of the electromagnetic solenoid 28 based on the weft unwinding detection information from the weft unwinding detector 29. The weft unwinding detector 29 detects the unwinding of the wound yarn on the thread winding surface 14a.

  The opening / closing control of the electromagnetic opening / closing valve 20 and the electromagnetic opening / closing valves 23 to 26 is performed by a command from the control device C. The control device C controls the opening / closing of the electromagnetic on / off valves 20 and 23 to 26 and the excitation of the electromagnetic solenoid 28 based on the loom rotation angle detection signal obtained from the rotary encoder 31 for detecting the loom rotation angle.

  A pressure detector 32 is connected to the main nozzle tank 19, and a pressure detector 33 is connected to the sub nozzle tank 22. The pressure detection information obtained by the pressure detectors 32 and 33 is input to the control device C. The control device C performs feedback control of the pressure control valves 21 and 27 based on the pressure information from the pressure detectors 32 and 33.

  As shown in FIG. 2, the sub nozzle 12 is fixed on the slay 15 via a support block 35. The sub nozzle 12 can enter and exit the opening of the warp T from between the rows of the warp T as the sley 15 swings.

  A weft detector 37 for detecting that the front end of the weft Y that has been inserted has reached the end of the weft insertion range is fixed on the sley 15 via a support block 38 so that the position can be adjusted. As shown in FIG. 1, the weft detector 37 is electrically connected to the control device C.

  As shown in FIGS. 2 and 3, an optical sensor 40 that detects the looseness of the weft Y on the main nozzle 11 side of the inner passage 17 is positioned on the slay 15 via a support block 38. It is fixed as possible. The optical sensor 40 is fixed at a position where the looseness of the weft Y can be detected within a range not affected by the injection pressure of the main nozzle 11.

  As shown in FIGS. 3 and 4, the optical sensor 40 has a tip end portion of the support body 41 facing the inner passage 17, and as shown by a chain line in FIG. Is fixed to the slay 15 so as not to interfere with the woven fabric W by moving below the woven fabric W and the pre-woven fabric W1. As shown in FIG. 4, the support 41 is formed in a cylindrical shape, and a light projecting unit 42 made of a light emitting diode and a light receiving unit 43 made of a phototransistor are provided at the tip of the support 41. The unit 43 is electrically connected to the control device C via a lead wire 44.

  The optical sensor 40 detects a state in which the weft Y travels in a wavy state and a state in which the weft Y travels in a stretched state based on the light reception signal received by the light receiving unit 43. And an output unit (not shown) that outputs a pulse signal at different timings. Specifically, the change state of the signal of the weft Y from the light receiving unit 43 is converted into a pulse using the modulated light, and the signal is output. As a result, as shown in FIG. 5, in the state in which the weft Y is traveling in a undulating state, the interval of the pulse signal P is shortened, and the state in which the weft Y is traveling in a stretched state is detected. In this state, the pulse signal interval becomes long. In FIG. 5, the timing at which the output interval of the pulse signal changes from a short state to a long state is the extended timing.

  A display device (not shown) is connected to the control device C. The control device C includes a microcomputer and a memory, and stores, for example, data stored in the memory for the past several hundreds of times, which is expressed by the loom rotation angle calculated from the output state of the pulse signal shown in FIG. It is designed to update sequentially. Then, the control device C can simultaneously display the stretch timing for the past multiple times of wetting with numerical data representing the loom rotation angle on the display screen of the display device, or as shown in FIG. Or display in a state corresponding to the loom rotation angle. The control device C functions as a determination unit that determines the timing at which the weft Y extends before the weft end arrival time based on the output signal of the optical sensor 40.

Next, the operation of the weft detection device for an air jet loom constructed as described above will be described.
When the air jet loom is driven, the weft detection device emits the modulated light from the light projecting portion 42 of the optical sensor 40 toward the inner ridge passage 17, and receives the light reflected by the guide recess 16a of the wing 16 Detect at 43. And the detection signal of the light-receiving part 43 is converted into a pulse signal by signal processing and outputted, and the flying state of the weft Y flying in the inner passage 17 is detected. When the state of the weft Y that travels in the lash inner passage 17 at a position facing the light projecting unit 42 and the light receiving unit 43 is a wavy state, the interval between the output pulse signals is shortened. In addition, when the weft Y is in a stretched state at a position facing the light projecting unit 42 and the light receiving unit 43, the interval between the output pulse signals becomes long. As a result, at the time when the flying state of the weft Y changes from the wavy state to the stretched state, as shown in FIG. 5, the pulse signal interval changes from a short state to a long state.

  The control device C stores the rotation angle of the loom when the interval of the pulse signal is changed from a short state to a long state every weft insertion as a timing at the time of stretching. As for the timing data at the time of skipping, old data is sequentially deleted and updated to new data from the time when a preset number of weft insertions or weft insertion times is exceeded. The control device C displays a predetermined number of times of data stored in the memory on the display screen of the display device as a value of the loom rotation angle at the timing of the stretch. Therefore, the operator can easily confirm whether the weft insertion is performed stably and under preset conditions by looking at the data.

  Further, when changing the type of weft Y and the weaving width, it is necessary to adjust the pressure of the compressed air injected from the main nozzle 11 and the sub nozzle 12. At that time, while changing the pressure of the compressed air ejected from the sub nozzle 12, the appropriate sub pressure of the sub nozzle 12 is adjusted while confirming the information of the weft looseness on the screen of the display device connected to the control device C. If set, the operation becomes easier compared to the case of using a strobe to check the extended state. In addition, in the weaving state where it is difficult to visually check the state of the weft in the warp opening by the method using a strobe, for example, when weaving a woven fabric in which the upper warp is continuous, such as a satin weave, the weft state and It is possible to easily check the timing.

According to this embodiment, the following effects can be obtained.
(1) The weft detection device is a weft detection device of an air jet loom in which weft Y is inserted through the inner passage 17 by air injection from the main nozzle 11 and the sub nozzle 12 for weft insertion. An optical sensor 40 for detecting the looseness of the weft Y on the main nozzle 11 side of the passage 17 is provided. According to this configuration, it is detected by the optical sensor 40 whether the portion near the rear end of the weft Y that flies through the inner passage 17 flies in a wavy state or flies in a stretched state. . Therefore, it is possible to monitor the state of the weft flying in the inner passage and display the timing at which the weft extends before the weft end arrival time.

  (2) The optical sensor 40 detects the looseness of the weft Y in a range not affected by the injection pressure of the main nozzle 11. In the range affected by the injection pressure of the main nozzle 11, it is difficult to determine whether or not the weft Y is in a stretched state from the detection signal of the optical sensor 40. However, if the amount of looseness of the weft Y is detected within a range not affected by the injection pressure of the main nozzle 11, it is easy to determine whether the weft Y is in a stretched state.

  (3) The optical sensor 40 outputs a pulse signal at different timings depending on whether the amount of looseness of the weft Y exceeds the allowable range or not. According to this configuration, by checking the output pulse signal from the optical sensor 40, it can be determined whether or not the weft Y is in a stretched state. Judgment becomes easier as compared with the case where it is determined whether or not it is in a stretched state. In addition, since the time at which the pulse interval of the pulse signal output from the optical sensor 40 changes is the weft Y stretch timing, it is also easy to determine the stretch timing.

The embodiment is not limited to the above, and may be embodied as follows, for example.
The control device C may issue a warning when confirming that the stretching timing has deviated from the preset allowable range in the operating state of the loom based on the stretching timing data. For example, as a warning method, a warning lamp is turned on or a warning sound is generated.

  ○ When the control device C is in a state in which the stretch timing deviates from the preset allowable range in the operating state of the loom based on the stretch timing data, the preset time or the predetermined number of weft insertions continues. The injection pressure of the sub nozzle 12 may be controlled. Further, the injection pressure of the sub nozzle 12 may be controlled and a warning may be given.

  The control device C is not limited to the configuration in which the weft detection device (optical sensor 40) is always driven during the operation of the loom so that the data related to the weft Y stretch timing is confirmed and displayed on the display screen. For example, the configuration may be such that only when the operator puts the weft detection device in the driving state, the weft detection device is driven to check the data regarding the stretch timing of the weft Y and display it on the display screen. In this case, since the weft detection device is driven only when the machine base is adjusted or when the operator needs it, energy consumption is reduced.

The optical sensor 40 may include a light projecting / receiving unit in which the light projecting unit 42 and the light receiving unit 43 are not independent, and the light projecting unit and the light receiving unit 43 are integrated.
○ The weft detection device arranges sensors at two or more locations in the inner passage 17 and detects the presence or absence of the weft Y by each sensor, and the timing when the weft presence signal is stably output from the specific sensor You may make it judge.

  The weft detection device may set a sensor detection region at the weft stable running position after the weft Y has been stretched, and may determine that the weft timing has been reached when the weft presence signal continues for a predetermined time or more.

  The optical sensor 40 is not limited to the range that is not affected by the injection pressure of the main nozzle 11, but is loosened by the weft Y at a position that is affected by the injection pressure of the main nozzle 11, for example, a position closest to the main nozzle 11. You may detect this.

  The optical sensor is not limited to a configuration that includes a pair of light projecting units and light receiving units, emits modulated light from the light projecting units, and the detection signals of the light receiving units are converted into pulse signals by signal processing and output. . For example, a sensor provided with a photoelectric sensor having a plurality of light projecting / receiving units may be used, and it may be determined that the signal is present when the weft presence signal continues from a specific light receiving unit.

  ○ The optical sensor has a configuration in which a light projecting unit (light projector) and a light receiving unit (light receiver) disposed in the vicinity of the inner passage 17 are electrically connected to a light projecting power source and a light receiving signal processing unit through lead wires. Not limited to. For example, the light projector and the light receiver are provided on the sley 15, the light projecting optical fiber whose base end is connected to the light projector and the light receiving optical fiber whose base end is connected to the light receiver, and the distal end of the light guide passage 17. It is good also as a structure inserted in the support body 41 so that it may be in the state which opposes. In this case, the support body 41 can be made thinner than a configuration in which a projector and a light receiver are provided in the support body 41.

  ○ When a configuration using optical fibers for light projecting and light receiving is adopted as an optical sensor, a plurality of optical fibers are inserted into the support 41, and a plurality of light projecting optical fibers and light receiving optical fiber tip portions Can be easily arranged along the vibration direction of the weft Y in the inner passage 17.

The following technical idea (invention) can be understood from the embodiment.
(1) In the invention according to any one of claims 1 to 3, a judging means for judging the timing at which the weft is stretched before the weft leading edge arrival time based on the output signal of the optical sensor. I have.

  (2) In the invention described in the technical idea (1), the determination means outputs data indicating the weft yarn stretching timing at a plurality of weft insertions by a loom rotation angle to a display device.

  P ... pulse signal, Y ... weft, 11 ... main nozzle, 12 ... sub nozzle, 17 ... inner passage, 40 ... optical sensor.

Claims (3)

A weft detection device for an air jet loom, in which wefts are inserted through an inner corridor by air injection from a main nozzle and a sub nozzle for weft insertion,
An optical sensor that detects the looseness of the weft on the main nozzle side of the inner passage, and the optical sensor is inserted into the warp opening from between the rows of warps as the sley swings. A weft detection device for an air jet loom, wherein the weft detection device is fixed to the sley so as to be able to enter and exit . 2. The weft of an air jet loom according to claim 1, wherein the optical sensor detects a looseness of the weft on the downstream side in the weft insertion direction relative to the sub-nozzle disposed closest to the main nozzle. Detection device.   The optical sensor detects a pulse signal at different timings when detecting a state in which the weft flies in a wavy state and when detecting a state in which the weft flies in a stretched state. The weft detection device for an air jet loom according to claim 1 or 2, wherein the weft detection device outputs.