• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Air jet type loom including the frame yarn detecting device, the weft yarn detecting device includes a main nozzle for inserting the weft yarn, a number of auxiliary nozzles for the weft yarn insertion. inserting the frame yarn, a comb having a comb passage, a sensor that detects a frame yarn in a crowd of warp yarns at the comb passage in an area extending between the center of the comb passage and the main nozzle , a signal processing device and an estimation section. The estimating section estimates the moment corresponding to the maximum tension of the weft thread based on the values of the output signals provided by the signal processing device.
    公开号:BE1023604B1
    申请号:E2016/5196
    申请日:2016-03-18
    公开日:2017-05-12
    发明作者:Yoichi Makino；Shinji Takagi；Ryuji Arai；Fujio Suzuki；Kazumasa Sumi
    申请人:Kabushiki Kaisha Toyota Jidoshokki；Toyota Chuo Kenkyusho Kabushiki Kaisha；Toyota Jidoshokki Kabushiki Kaisha；
    IPC主号:
    专利说明:

    DEVICE FOR DETECTING FRAME WIRE FOR AN AIR JET TYPE WEAVING
    BASIS OF THE INVENTION
    The present invention relates to a device for detecting a weft thread for a loom of the air jet type. More specifically, the present invention relates to a weft yarn detecting device that detects the condition of a weft yarn inserted through the passageway in a comb by means of an air jet supplied by a main nozzle. and by auxiliary nozzles.
    In this type of air jet type loom, the state of the weft yarn during the insertion of the weft yarn largely depends on the setting of the pressure of the air under pressure. Conventionally, Japanese Patent Laid-Open Publication No. 4-241135 discloses a weft thread insertion pressure setting device for a web type loom. air jet, which is configured to improve ejection fluid consumption efficiency, while suppressing the release of the weft yarn in the last half of the weft insertion and while reducing the number of incorrect intersections in the insertion of the weft thread. The control or adjustment device in the publication mentioned above detects the moment corresponding to the end of the unwinding of the weft thread and the moment corresponding to the arrival of the leading end of the weft thread in a storage device and measuring the weft yarn and adjusts the jet pressure of the main nozzle based on the moment corresponding to the arrival of the leading end of the weft yarn. Also, based on the difference between the moment corresponding to the arrival of the leading end of the weft thread and the moment corresponding to the end of unwinding of the weft thread, the control or adjustment device adjusts the pressure of the weft thread. jet of the main nozzle and the jet pressure of the auxiliary nozzles. Specifically, when the difference between the detected moment corresponding to the arrival of the leading end of the weft yarn and the detected moment corresponding to the end of the unwinding of the weft thread is greater than a target value, the control device instructs the auxiliary nozzles to increase the jet pressure. When the difference between the two moments is less than the target value, the controller instructs the auxiliary nozzles to reduce the jet pressure.
    When the insertion of the weft yarn is implemented by flying a yarn Y stored in the storage device and measuring the weft yarn through the passage made in the comb, in other words the passage of the comb, on base of the air jet supplied by the main nozzle and the auxiliary nozzles, the portion of the weft yarn closest to the rear end is corrugated before the front end of the weft yarn reaches a predetermined position which corresponds to the completion of the insertion of the weft thread, as shown in FIG. 17A. At a time which is near the completion of the insertion of the weft yarn, the corrugation disappears as shown in FIG. 17B, so that the insertion of the yarn is prevented. The weft thread is implemented under conditions in which the weft yarn Y is in a state in which it is subjected to a state of maximum tension.
    Under conditions in which the timing of the arrival of the leading end of the TW weft yarn, namely the moment at which the leading end of the weft yarn reaches the end of the yarn insert insertion range. frame, is maintained at a constant value, the relationship that exists between the jet pressure of the auxiliary nozzles (ie the auxiliary pressure), the difference between the moment TW corresponding to the arrival of the front end of the weft yarn and the moment corresponding to the end of unwinding of the weft thread TBW in the weft measuring storage device (TW-TBW), and the moment at which the weft yarn is subjected to a maximum tension, is as shown in FIG. 18. In FIG. 18, the angles formed by the moment TW corresponding to the arrival of the leading end of the weft yarn and the moment corresponding to the end of unwinding of the weft thread TBW represent the angles of rotation of the loom. tiss st. As shown in Fig. 18, the rotation angle of the loom at the moment corresponding to the conditions under which the weft yarn Y is subjected to a tension decreases proportionally to the increase of the auxiliary pressure. In other words, the higher the auxiliary pressure, the earlier will be the moment corresponding to a maximum voltage.
    When determining the optimal jet pressure of the auxiliary nozzles when inserting a weft yarn, a spot modification of the difference (TW - TBW) between the moment TW corresponding to the arrival of the front end weft yarn, which corresponds to the moment at which the leading end of the weft yarn reaches the end of the insertion range of the weft yarn, and the moment corresponding to the end of unwinding of the weft yarn TBW in the storage device and measuring the weft thread, is used to act as one of the indications. However, in this case, the condition of the weft yarn in the warp shed is not monitored directly, and the spot change is only an alternative indication. It is therefore impossible to determine, based on the value of the difference TW - TBW, the margin left at the auxiliary pressure to optimize the moment which corresponds to a maximum voltage. Therefore, when adjusting the loom, a strobe is used to check the condition of the weft yarn with the naked eye and adjusts the auxiliary pressure accordingly. However, in a fabric structure in which the lower warp yarns are continuous, as is the case in satin weave, it is difficult in some cases to check the state of the weft yarn in the crowd of yarns. string using a strobe. EP0204093 discloses a light reflection type frame detection apparatus for use in a jet loom, wherein the weft yarn is caused to move by a jet fluid in a planned weft guide passage along a bobbin-mounted reed, the axis extending in the direction of the weft guide guide passage, a light-receiving section adapted to receive light projected from said reflected light-emitting section; by the weft yarn in said guide passage, and means for supporting at its end the elements characterized in that said support means are arranged to be movable so that said light transmitting and receiving sections are capable of spreading said warp yarns and entering the warp shed.
    SUMMARY OF THE INVENTION
    Accordingly, it is an object of the present invention to provide a weft yarn detection device for an air jet type loom which is designed to monitor the condition of a weft yarn during its operation. flying through the comb passage and detecting the moment at which the weft yarn is subjected to a maximum tension before the moment corresponding to the arrival of the leading end of the weft yarn.
    To achieve the above object and in accordance with an aspect of the present invention, a weft yarn detection device is provided for an air jet type loom. The air jet type loom includes a main nozzle for inserting the weft yarn, a number of auxiliary nozzles for insertion of the weft yarn, and a comb which includes a number of teeth which are arranged in the insertion direction of the weft thread. The teeth each comprise a guide recess. The guide recesses define a comb passage. The insertion of the weft thread through the passage of the comb is implemented by an air jet supplied by the main nozzle and the auxiliary nozzles. The weft detection device includes a sensor, a signal processing device and an estimation section. The sensor detects a weft yarn in the crowd of warp yarns as the comb passes through an area extending between the center of the comb and the main nozzle. The signal processing device receives output signals from the sensor and passes output signals whose frequencies are in the range of 0.5 kHz to 20 kHz. The estimating section estimates the moment which corresponds to a maximum voltage of the weft yarn based on its output signals provided by the signal processing device. The moment corresponding to a maximum voltage represents the moment corresponding to the passage of the fi! frame in the stretched state from a relaxed state. Other aspects and advantages of the present invention will become apparent from the following description when taken in conjunction with the accompanying drawings in which the principles of the invention are exemplified.
    BRIEF DESCRIPTION OF THE DRAWINGS The invention, together with its objects and with its advantages, can best be understood by reference to the following description of the presently preferred embodiments, together with the accompanying drawings, in which: FIG. 1 is a schematic view showing a weft insertion device according to a first embodiment; Figure 2 is a schematic perspective view showing the positional relationships between the main nozzle, the auxiliary nozzles, the comb and the sensor; Figure 3 is a schematic side view, a portion of which has been cut away and in which the positional relationships between a tooth and the sensor are shown; Fig. 4 is a diagram showing the positional relationships between the comb passage and the light source / light receiver; Fig. 5 is a diagram showing changes in the sensor output voltage and the weft feed rate relative to the crankshaft angle; FIG. 6A is a diagram showing the difference in a Fast Fourier Transform (FFT) analysis between a case in which a release of the weft yarn is detected is a case in which no slack in the yarn is detected. frame; Figure 6B is a diagram showing the relationship between an actual value and the frequency; Fig. 7 is a diagram showing the relationship between changes in the absolute value of the filter output and the crankshaft angle; FIG. 8 is a diagram showing the relationship between the output voltage of a circuit for calculating the average and the crankshaft angle; Fig. 9 is a diagram showing a weft insertion device according to the second embodiment; Figure 10 is a diagram showing the relationship between the output of a filter and the crankshaft angle; FIG. 11 is stapled in which the relation between an auxiliary pressure Ps and an average voltage Eh is obtained by integration, in a case in which we use, as weft yarn, a yarn having a 45 thread count. / cm2 consisting of a polyester / cotton blend; Fig. 12 is a graph showing the relationship between the auxiliary pressure Ps and the angle Tn corresponding to the maximum voltage of a weft yarn; Fig. 13 is a graph showing the relation between the average voltage Eh which is obtained by integration and the angle Tn corresponding to the maximum voltage of a weft yarn; Figure 14 is a side view showing a special comb; Fig. 15 is a graph showing the relationship between the auxiliary pressure Ps is an integrated value of an output voltage in a case in which a combed cotton yarn having a texture of 80 is used as the weft yarn; wires / cm2; Fig. 16 is a graph showing the relationship between the auxiliary pressure Ps and an integrated value of an output value in a case where a yarn having a thread of 45 thread is used as a weft yarn. $ / cm2 consisting of a polyester / cotton blend; Fig. 17A is a diagram showing the state of the weft yarn before it is subjected to maximum tension; Fig. 17B is a diagram showing the state of the weft yarn after it has been subjected to maximum tension; and Fig. 18 is a graph showing the relationship between an auxiliary pressure and a state corresponding to a maximum voltage. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First embodiment
    A first embodiment of the present invention will now be described with reference to FIGS. 1 to 8
    As shown in FIGS. 1 and 2, an air jet loom includes a main nozzle 11 for insertion of the weft yarn, a number of auxiliary nozzles 12 for the insertion of the weft yarn, a comb 13 (which is shown in FIG. 2) and a device for storing and measuring the weft yarn 14 (which is shown in FIG. 1). As shown in FIG. 2, the main nozzle 11, the auxiliary nozzles 12 and the comb 13 are fixed on a leaf 15. The comb 13 includes teeth 16 which are arranged in the insertion direction of the weft thread. Each tooth 16 has a guide recess 16a. The guide recesses 16a of the teeth 16 form a comb passage 17.
    As shown in Figure 1, the main nozzle 11 is connected to a reservoir 19 for the main nozzle 11 via a pipe. The reservoir 19 of the main nozzle is connected to a source pressure reservoir 18. An electromagnetic on / off valve 20 is provided between the main nozzle 11 and the reservoir 19 of the main nozzle. A pressurized air jet for insertion of the weft thread from the main nozzle 11 is controlled by the opening and closing of the electromagnetic start / stop valve 20. the pressure is provided between the source pressure reservoir 18 and the reservoir 19 of the main nozzle. The pressure of the nozzle 19 of the reservoir 19 of the main nozzle is regulated by the valve 21 for adjusting the pressure.
    The auxiliary nozzles 12 are connected to a tank 22 for the auxiliary nozzles 12 via a pipe. The reservoir 22 of the auxiliary nozzles is connected to the reservoir 18 of source pressure. On / off electromagnetic valves 23, 24, 25, 26 are provided between the auxiliary nozzles 12 and the tank 22 of the auxiliary nozzles. An air jet pressurized for the insertion of the weft yarn from the tank 22 of the auxiliary nozzles is controlled by the opening and closing of the electromagnetic start / stop valves 23, 24, 25, 26. The valves electromagnetic actuators 23 to 26 control the supply of the pressurized air to the auxiliary nozzles 12. The electromagnetic on / off valves 23 to 26 are successively controlled to open and close by such that a so-called "relay jet" is generated via the auxiliary nozzles 12. An electric valve 27 of the pressure setting is provided between the source pressure reservoir 18 and the nozzle reservoir 22 auxiliary. The pressure of the reservoir 22 of the auxiliary nozzles is regulated by the valve 27 for adjusting the pressure.
    The weft yarn storage and measuring device 14 has a weft winding surface 14a. The winding of a weft yarn Y on the weft winding surface 14a and the unwinding of the weft yarn Y from the weft winding surface 14a are controlled by the extension and the retraction of a rod acting as a stop device 28a of an electromagnetic solenoid 28. The electromagnetic solenoid 28 is excited and de-energized via a command issued by a control device C. The control device C controls the de-excitation of the electromagnetic solenoid 28 based on information about the unwinding of the weft yarn Y from the weft unwinding detector 29. The weft unwinding detector 29 detects the unfolding of the weft yarn wound on the winding surface weft yarn 14a. The opening and closing of the electromagnetic start / stop valves 20 and 23 to 26 are controlled by commands issued by the controller C. Based on signals which indicate a detected rotation angle of the loom, provided by a rotary encoder 31 which detects the rotation angle of the loom, the control device C controls the opening and closing of the electromagnetic start / stop valves 20 and 23 to 26 and the excitation of the electromagnetic solenoid 28.
    A pressure sensor 32 is connected to the reservoir 19 of the main nozzle and a pressure sensor 33 is connected to the reservoir 22 of the auxiliary nozzles. The pressure sensing information detected by the pressure sensors 32, 33 is transmitted to the controller C. The controller C controls its pressure control valves 21, 27 based on the pressure information provided by the controller. the pressure sensors 32, 33. A display device 34 is connected to the control device C.
    As shown in FIG. 2, the auxiliary nozzles 12 are fixed to the flapper 15 by means of support blocks 35. The auxiliary nozzles 12 are configured to enter the crowd of the T chain wires and to come out between the rows. chain threads T as the flapper 15 oscillates.
    A weft detector 37 is attached to the wing 15 by means of a support block 38 in such a way that the position of the weft detector 37 can be adjusted. The weft detector 37 detects the moment at which the forward end of the weft yarn Y has reached the end of the extent of the weft insertion. As shown in FIG. 1, the weft detector 37 is electrically connected to the controller C.
    As shown in FIGS. 23, a comb-internal sensor 40 is attached to the flapper 15 by means of a support block 38 in such a way that the position of the internal sensor 40 can be adjusted to the comb. The internal comb sensor 40 detects the weft yarn Y in a plurality of warp yarns at the comb passage 17 in a zone extending between the center of the comb passage 17 and the main nozzle 11. The internal comb sensor 40 is disposed in an area in which the internal comb sensor 40 is able to detect the state of the weft yarn Y without being influenced by the jet pressure of the main nozzle 11. The internal comb sensor 40 can detect the yarn Y-weft in a zone extending in the comb passage 17 between the weft detector 37 and the auxiliary nozzle 12 closest to the main nozzle 11.
    As shown in FIGS. 3 and 4, the internal comb sensor 40 is attached to the wing 15 in such a manner that the distal end of the support body 41 faces the comb passage 17. Also, as indicated by the line discontinuous in Figure 3, the internal sensor 40 to the comb is fixed to the leaf 15 so that during the weaving of the pick, the distal end of the support body 41 moves in a space below the fabric woven fabric W and the pick line W1, without interfering with the woven fabric W. The support body 41 has a space 42 serving as a housing, in which is housed an optical fiber 43 of light emission and a optical fiber 44 for receiving light. The light emitting optical fiber 43 and the light receiving optical fiber 44 have end faces 43a, 44a and are arranged to face the guide recesses 16a of the teeth 16 in such a manner that the end faces 43a, 44a are arranged superimposed on one another. By this is meant that the light-emitting optical fiber 43 and the light-receiving optical fiber 44 are arranged in such a way that the end faces are oriented towards the flight channel of the light. In the present embodiment, the light emitting optical fiber 43 is disposed on the upper side and the light receiving optical fiber 44 is disposed on the lower side.
    As shown in FIG. 2, the air jet type loom has a chest 45 which is stationary despite oscillation movements of the leaf 15. A weft amplifier 46 and a bandpass filter 47, which serves as a signal processing device, are attached to the chest 45. The weft amplifier 46 has a light emitting device and a light receiving device. A light emitting diode (LED) is used to act as a light emitting device and a photodiode is used to act as a light receiving device. The frame amplifier 46 converts the optical signals received by the light receiving optical fiber 44 into electrical signals, amplifies the electrical signals and sends electrical signals to the bandpass filter 47. From the output signals of the sensor 40 internal to the comb [from the field amplifier 46 to be more precise], the bandpass filter 47 passes the output signals which are in the frequency range from 2 kHz to 5 kHz.
    As shown in FIG. 1, the bandpass filter 47 is connected to the control device C via an analog / digital converter 48 in such a way that the signals transmitted by the bandpass filter 47 are distributed to the control device C via the analog / digital converter 48. The control device C serves as an estimation section which estimates (determines) the moment corresponding to the maximum voltage, namely the moment at which the value of a signal transmitted by the bandpass filter 47 fall to a predetermined threshold value. Specifically, the controller C includes a central processing unit (CPU) 49 and a memory 50. The CPU 49 receives analog signals that have been processed by the bandpass filter 47 via the analog-to-digital converter 48. a sampling frequency of a number of tens of kHz and implements the methods indicated above, which include a calculation of the absolute value, a calculation of the average value of 100 weft insertions, the calculation the average displacement, a calculation of the moment corresponding to the maximum tension and an estimate (determination). The memory 50 stores a threshold value for estimating the moment corresponding to the maximum voltage, as a graphical data item or in the form of an equation related to the apparent diameter of a weft thread. The threshold value is set as a value of a medium output voltage.
    The threshold value for the estimation of the moment corresponding to the maximum voltage is calculated for example in the manner as indicated below. The intensity of incident light parα with respect to its light receiving optical fiber 44 differs between a case in which a case in which the weft yarn Y flies while being subjected to ripples and a case in which the yarn Y frame flies while being subjected to maximum tension. Thus, the output voltage of the weft amplifier 46 differs depending on the state of the weft yarn Y.
    FIG. 5 shows the changes as regards the output voltage of the internal sensor to the comb 40 and with respect to the feed speed of the weft yarn with respect to the crankshaft angle and with respect to the time in a case in which the insertion of the weft yarn is carried out at a speed of 806 rpm using a polyester / cotton blend yarn having a thread count of 45 threads / cm 2, as thread of frame. In FIG. 5, the zone extending from the moment 0, which corresponds to the angle of passage formed by the distal end of the weft thread (108 °), up to the moment corresponding to 20 ms represents the zone wherein the wire is relaxed. The area that extends after the time corresponding to 20 ms (for example until the moment corresponding to 40 ms) represents the zone of tension of the wire.
    Signals in both zones are subjected to frequency analysis using an FFT-type analyzer. FIG. 6A shows the results of the analysis for 1,000 weft insertions in a case in which the weft yarn is relaxed and in a case in which the weft yarn is subjected to tension. In the frequency range of 700 Hz to 5 kHz in FIG. 6A, the effective value of the output voltage is greater in the case of the weft yarn relaxed than that obtained in the case of the weft yarn subjected to voltage. FIG. 6B shows the ratio of the effective values between the case in which the weft yarn is relaxed and the case in which the weft yarn is subjected to a tension. In Fig. 6B, it can be seen that the ratio of actual values is highest at the frequency of 2 kHz, and that the difference between its actual values tends to be large in this area.
    Based on the above-mentioned findings, the output signals of the frame amplifier 46 are input to the controller C via the bandpass filter 47 which passes output signals in the frequency range of 2 kHz to 5 kHz, and in the analog / digital converter 48. The CPU 49 then determines the moment corresponding to the maximum voltage.
    The CPU 49 first implements a process of calculating the average. In the averaging process, the CPU 49 receives the signals of the bandpass filter 47 at a sampling rate of 50 kHz and at a measurement time of 60 ms by inserting the weft and calculates the absolute value the measured voltage. The results are shown in FIG. 7. As shown in FIG. 7, the absolute value of the output of the filter is greater than the state in which the weft yarn is relaxed relative to that obtained for a weft yarn. in the state in which he is subjected to a tension.
    Then, based on 100 weft insertions, the average value in each sampling time is calculated with respect to a crankshaft angle of 0 °. Based on the result, the displacement average is calculated in 2 ms (100 points) to obtain an average of the time series data. The results are shown in Figure 8.
    Then, an adjustment is made to match the results to the results of the naked eye monitoring using a stroboscope so as to be able to determine the threshold value of the moment corresponding to a maximum tension of the weft yarn. The crankshaft angle corresponding to the determined moment is set as the moment at which the weft yarn is subjected to a maximum tension.
    In accordance with the method described above, the threshold value is determined using a combed cotton yarn having a thread count of 80 threads / cm 2 for insertion of weft yarn at a rotational speed of 908 rpm. while modifying the auxiliary pressure (the jet pressure of the auxiliary nozzles) from 240kPa to 340kPa in increments of 20kPa. The threshold value is determined using a polyester / cotton blend yarn having a thread count of 45 threads / cm 2 for insertion of weft yarn at a rotational speed of 908 rpm while modifying the auxiliary pressure ( the jet pressure of the auxiliary nozzles) from 260 kPa to 340 kPa in 20 kPa increments. In addition, the threshold value is determined using a cotton thread having a thread count of 20 threads / cm 2 for insertion of weft yarn at a rotational speed of 908 rpm while modifying the auxiliary pressure (jet pressure). auxiliary nozzles) from 260 kPa to 340 kPa in increments of 20 kPa. The results indicate a substantially proportional relationship between the threshold value and the apparent diameter of the weft yarn.
    The operation of the weft yarn detection device of the air jet type loom, as described above, will now be described.
    In the operating state of the air jet type loom, the weft yarn detecting device emits light from the light emitting optical fiber 43 of the internal sensor 40 to the comb in the direction of the beam. comb passage 17 and receives the light reflected by the guide recesses 16a of the teeth 16 and the weft yarn Y using the optical fiber 44 for receiving the light. The light received by the light receiving optical fiber 44 is inputted to the weft amplifier 46. The weft amplifier 46 receives the light using a photodiode as a light receiving device and transforms the light into light. electrical signals. The frame amplifier 46 amplifies the electrical signals and then sends the signals to the bandpass filter 47. From the signals transmitted by the frame amplifier 46, the bandpass filter 47 sends signals in the frequency range of 2 khz at 5 kHz to the control device C via the analog / digital converter 48. The CPU 49 of the control device C receives the analog signals which have been processed by the bandpass filter 47 via the analog / digital converter 48 at a sampling frequency of a number of tens of kHz and implements the processes indicated above, which include the calculation of the absolute value, the calculation of the average value of 100 weft insertions and the calculating a moving average. The crank angle at which the average output voltage in the graph of the calculated average of the displacement (the graph corresponding to that of FIG. 8) is equal to the threshold value stored in the memory 50 at the moment corresponding to the maximum voltage. The CPU 49 displays the moment corresponding to the maximum voltage using the display device 34 in case of necessity
    The present embodiment provides the advantages indicated below. (1) The weft yarn detection device is used for the air jet type loom, which includes a main nozzle 11 for insertion of the weft yarn, auxiliary nozzles 12 for the insertion of the weft yarn. weft yarn and a comb 13 which includes teeth 16 including guide recesses 16a which are arranged in the insertion direction of the weft yarn. The insertion of the weft yarn Y through the comb passage 17 is carried out via an air jet supplied by the main nozzle 11 and by the auxiliary nozzles 12. The weft detection device includes a sensor ( the sensor 40 internal to the comb), a signal processing device (the bandpass filter 47) and an estimation section (the CPU 49). The comb-internal sensor 40 detects the weft yarn Y in the shed of the warp yarns at comb passage 17 in the region extending between the center of the comb passage 17 and the main nozzle 11. The band-pass filter 47 receives the output signals from the internal comb sensor 40 and passes the output signals in the frequency range from 0.5 kHz to 20 kHz. The CPU 49 estimates the moment corresponding to the maximum voltage of the weft yarn Y based on the value of the output signals emitted by the bandpass filter 47. Accordingly, while monitoring the state of the weft yarn Y which flies through the comb passage 17, it is possible to detect the moment corresponding to a tension of the weft yarn Y before the moment corresponding to the arrival of the front end of the weft yarn. (2) The bandpass filter 47 passes the output signals emitted by the internal sensor 40 to the comb in the frequency range from 2 kHz to 5 kHz. From the output signals from the internal comb sensor 40, the bandpass filter 47 passes signals in the frequency range from 0.5 kHz to 20 kHz. However, compared to the case in which the bandpass filter 47 passes the output signals in the frequency range from 0.5 kHz to 20 kHz, the destination section (the CPU 49) is able to avoid the problems related to the processing of signals having unnecessary frequencies in the output signals of the bandpass filter 47 when the bandpass filter 47 passes signals in the range of 2 kHz to 5 kHz. This feature facilitates treatment. (3) The detection zone of the comb-internal sensor 40 represents the lower portion of the comb passage 17. In this case, the comb-internal sensor 40 easily detects the condition of the weft yarn Y during its flight through 17 (4) The destination section (the CPU 49) judges the moment corresponding to the voltage setting as the moment at which the value of the output signal emitted by the signal processing device (the filter bandpass 47) drops to the predetermined threshold value. Therefore, while monitoring the state of the weft yarn Y during its flight through the comb passage 17, it is possible to detect the moment corresponding to a maximum tension of the weft yarn Y before the time corresponding to the yarn. arrival of the front end of fi! frame. (5) The threshold value is set based on the apparent diameter of the weft yarn Y. A substantially proportional relationship can be observed between the apparent diameter of the weft yarn Y and the threshold value. Thus, for weft yarns Y having different apparent diameters, after having obtained the threshold value of one of the weft yarns Y, it is easy to adjust the threshold values of the other weft yarns Y, without having to carry out tests. .
    Second embodiment
    A second embodiment will now be described with reference to FIGS. 9 to 16. The second embodiment differs from the first embodiment in that the estimation section (the CPU 49) does not estimate the corresponding moment. at the maximum voltage as the moment at which the value of the output signal from the signal processing device (the bandpass filter 47) drops to a predetermined threshold value, but estimates the moment corresponding to the maximum voltage via an integration process. Components that are analogous or identical to the corresponding components of the first embodiment will not be described.
    As shown in FIG. 9, as hardware components, a full-wave rectifier 51, a mean calculation circuit 52 and an integration circuit 53 between the bandpass filter 47 and the analog / digital converter are provided. 48. The full wave rectifier 51, the averaging circuit 52 and the integrating circuit 53 are arranged in this order from the bandpass filter 47.
    FIG. 10 shows examples of changes with respect to the signal corresponding to a crankshaft angle equal to 0 °, the output signal of the bandpass filter 47, the integration period, the signal which retains the integrated value, the output signal of the sensor 40 internal comb after the wave rectification and the integration signal during commissioning of the loom of the air jet type.
    The CPU 49 estimates an angle corresponding to a maximum voltage (the moment corresponding to the maximum voltage) via an integration process among the processes indicated below. 1. At each insertion of the weft yarn, the integration circuit 53 integrates, in real time, a signal which has passed through the bandpass filter 47, the full wave rectifier 51 and the averaging circuit 52. The integrated value (holding voltage) in a period that extends from the beginning of the passage of the weft thread to the end of the insertion of the weft thread, which represents the integration period, is stored in memory . 2. An average integrated value Eh is obtained from a number of weft insertions (eg from 100 weft insertions) for each jet pressure of the auxiliary nozzles 12 (which can be hereinafter to simplify by the expression "auxiliary pressure Ps"). 3. The relationship between the auxiliary pressure Ps and the average voltage or the integrated value Eh is obtained. The relationship between the auxiliary pressure Ps and the integrated value (the average voltage) Eh is for example as shown in FIG. 11. 4. The relation between the auxiliary pressure Ps and the angle Tn corresponding to the maximum tension of the wire is obtained. of Y-frame via naked-eye monitoring carried out in advance using a stroboscope and the relation thus obtained is used as training data (as can be seen in Figure 12). 5. For each auxiliary pressure Ps, we obtain the relation between the integrated value (the average voltage) Eh, which is obtained via the integration method, and the angle Tn corresponding to the maximum voltage, which is obtained in through naked eye monitoring, in order to derive a linear approximation equation (as can be seen in Figure 13). In FIG. 13, the interrupted straight line corresponds to the linear approximation equation. 6. We replace the integrated value (the average voltage) Eh, which is obtained by integration, in the linear approximation equation in order to estimate the angle Tn corresponding to the maximum voltage. The angle Tn thus obtained corresponding to the maximum voltage represents the angle Tn corresponding to the maximum voltage, which is obtained via the integration method.
    As shown in Figure 14, as a comb 13, a special comb may be used which has a tooth 16 whose lower jaw 16c is less protruding than the upper jaw 16b. In the case of the special comb, the auxiliary nozzles 12 may be arranged closer to the lower wall of the comb passage 17 than in the case of the normal comb which uses a tooth 16 having a protruding extent which is essentially identical for the · upper jaw and for the lower jaw. Similarly, in the case of the special comb, the insertion of the weft yarn can be carried out with a greatly reduced flow rate with respect to the compressed air ejected by the auxiliary nozzles 12. large extent to the energy saving of the air jet type loom.
    In the first embodiment, the moment corresponding to the maximum voltage is estimated to be the moment at which the value of the output signal emitted by the signal processing device (the bandpass filter 47) drops to a threshold value. predetermined. In this case, depending on the type of wire, the changes with respect to the detection signals of the internal comb sensor 40 can not be detected easily. Similarly, in the case of a weft yarn Y which has a small oscillation, the angle Tn corresponding to the maximum tension can not be easily detected. On the other hand, in the case where the angle Tn which corresponds to the maximum voltage is estimated via the integration method of the present embodiment, the detection of the angle Tn which corresponds to the maximum voltage is not made difficult on the basis of the type of wire or on the basis of the dimension of the wire, contrary to the case in which the angle Tn which corresponds to the maximum voltage is estimated by using a threshold value.
    For example, we seek to know the relationship between the auxiliary pressure Ps and the angle Tn which corresponds to the maximum voltage, the relationship between the angle Tn which corresponds to the maximum voltage and the auxiliary pressure Ps, which is obtained via the integration method essentially corresponds to the relationship between the angle Tn corresponding to the maximum voltage and the auxiliary pressure Ps that is obtained via monitoring with the naked eye using a strobe. However, in some cases, the relationship between the auxiliary pressure Ps and the angle Tn which corresponds to the maximum voltage obtained by using a threshold value does not correspond to the relationship between the angle Tn corresponding to the maximum voltage and the auxiliary pressure Ps that is obtained via monitoring with the naked eye using a strobe. In cases in which thicker yarns are used (for example a yarn with a thread count of 6 threads / cm 2), the difference with respect to the angle T n corresponds to the maximum tension obtained by means of monitoring at the naked eye using a strobe is important.
    The optimal auxiliary pressure Ps corresponding to the insertion of the weft yarn can be determined on the basis of the relation the angle of rotation, i.e. the angle which corresponds to the difference between the moment TW corresponding to the arrival of the leading end of the weft yarn and the moment corresponding to the end of unwinding of the weft thread TBW in the weft measuring storage device (TW-TBW) and the auxiliary pressure Ps. it is possible to determine the optimum auxiliary pressure Ps based on the relationship between the integrated value obtained by the integration method and the auxiliary pressure Ps. FIGS. 15 and 16 each represent the relationship between the integrated value and the auxiliary pressure Ps. Specifically, in FIG. 15, a case is shown in which a combed cotton yarn having a thread count of 80 threads / cm 2 is used, and FIG. 16 represents a case in which one uses a yarn consisting of a polyester / cotton blend having a thread count of 45 threads / cm 2. In each case, a one-off change can be observed at which the magnitude of change of the integrated value changes greatly with respect to the auxiliary pressure Ps. The auxiliary pressure Ps at the point change in question corresponds generally to the auxiliary pressure Ps which was obtained based on the relationship between the angle of rotation and the auxiliary pressure Ps. The auxiliary pressure Ps obtained is based on the point change as the optimal auxiliary pressure Ps for the insertion of the weft yarn. In the case of a cotton thread having a thread count of 20 threads / cm 2 or a cotton thread having a thread count of 6 threads / cm 2, there is also a one-off change in which the magnitude of change of the integrated value changes strongly by relative to the auxiliary pressure Ps, and the optimum auxiliary pressure Ps can be obtained for the insertion of the weft yarn, in the same manner.
    Accordingly, in addition to the advantages (1) to (3) provided by the first embodiment, the second embodiment provides the following advantages. (6) The sensor (comb internal sensor 40) emits a voltage at each insertion of weft yarn. The estimation section (the CPU 49) integrates the output voltage for each pressure (jet pressure) of the auxiliary nozzles 12 in order to obtain an integrated value (holding voltage). The estimation section averages the integrated values of a number of weft insertions in order to calculate an average integrated voltage (the integrated value Eh), thereby obtaining the relationship between the pressure of the auxiliary nozzles 12 and the average integrated voltage (the integrated value Eh). Similarly, the CPU 49 derives a linear approximation equation from the relationship between the angle formed by the weft yarn Y Sors of the maximum tension and the pressure of the auxiliary nozzles 12 that is obtained via a monitoring at the naked eye using a stroboscope and the relationship between the pressure of the auxiliary nozzles 12 and the average voltage (the integrated value Eh). The CPU 49 then estimates Se moment corresponding to the maximum voltage based on the average voltage integrated value Eh) that is obtained by integration and on the linear approximation equation. Thus, unlike the case corresponding to the first embodiment, in which the moment corresponding to the maximum voltage is estimated by using a threshold value, the detection of the angle Tn which corresponds to the maximum voltage is not made difficult. base of the type of wire or based on the wire size. Likewise, when the weft yarn Y has a small oscillation, it is possible to reliably detect the angle Tn which corresponds to the maximum tension. In addition, even when a special comb is used, the moment corresponding to the maximum voltage can be reliably estimated. (7) Unlike the first embodiment in which the moment corresponding to the maximum voltage is estimated using a threshold value, there is no need to determine a threshold value for each type of wire.
    The present invention is not limited to the embodiments which have been described above; it can be modified as indicated below.
    The bandpass filter 47 is not limited to a bandpass filter which permits the passage of output signals in the frequency range from 2 kHz to 5 kHz. It can take any configuration as long as it allows output signals in the frequency range of 0.5 kHz to 20 kHz. For example, a configuration that allows the passage of output signals in a frequency range of 1 kHz to 5 kHz can be used. Similarly, the bandpass filter 47 may be configured to allow the passage of output signals of all frequencies in the range of 0.5 kHz to 20 kHz. However, in this case, the processing load that the estimation section (the CPU 49) has to support will be greater.
    When implementing the averaging process for the output signal of the bandpass filter 47, the CPU 49 uses a sampling frequency of 50 kHz and a measurement time by insertion of weft thread equal to 60 ms. However, CPU 49 may use other sampling rates and other measurement times by inserting weft. The number of weft insertions is not limited to 100 insertions, but can represent a number of tens of insertions or a number greater than 100 insertions.
    The light receiving device is not limited to a photodiode. It can be any photoelectric conversion element such as a phototransistor.
    In the first embodiment, a full-wave rectifier and a low-pass filter may be provided for calculating the average between the band-pass filter 47 and the analog-to-digital converter 48. For example, as indicated by the lines formed by long double lines and short lines in FIG. 2, a full-wave rectifier 51 and an averaging circuit 52 can be arranged in the vicinity of the band-pass filter 47 in the chest 45. The output of the calcu- lation circuit 45 is shown in FIG. the average 52 is distributed to the analog / digital converter 48. In this case, since the calculation of the absolute value is carried out by the full-wave rectifier 51 and the calculation of the average of the displacement is carried out by the calculation circuit of the average 52, it is possible to reduce the sampling frequency of the analog / digital converter 48 to a value as low as 10 kHz. In this way, the consumption of the memory can be significantly reduced.
    In the second embodiment, the averaging circuit 52 can be omitted.
    In the illustrated embodiments, a frame amplifier 46 is used which is configured such that it integrates the light-emitting device which emits light towards the optical fiber 43 for transmitting light the internal comb sensor 40 and the light receiving device receiving the light from the light receiving optical fiber 44. The frame amplifier 46 may be replaced by an amplifier, a diode which emits light acting as a light-emitting device and a photodiode which acts as a light-receiving device, which is provided with separate way.
    The signal processing device is not limited to the bandpass filter 47. It can be configured in such a way that a high-pass filter and a low-pass filter are used. Similarly, the signal processing device may include an amplifier, if necessary.
    The threshold value can be determined for each group of yarn types Y. For example, different threshold values can be set for two-end plied yarns and for single yarns.
    The controller C may issue a warning upon a determination that the moment corresponding to the maximum voltage is outside a permissible range of a predetermined operational state of the loom. As a warning procedure, a warning light can be turned on or a warning sound can be heard.
    The controller C may control the jet pressure of the auxiliary nozzles 12 upon a determination that the moment corresponding to the maximum voltage continues outside the permissible range of the predetermined operational state of the loom for a predetermined period of time or during a predetermined number of weft insertions. Similarly, a warning may be sent when the jet pressure of the auxiliary nozzles 12 is set.
    In the operating state of the loom, the weft detection device need not be constantly activated to detect the moment corresponding to the maximum tension of the weft yarn Y. For example, the yarn detection device frame can be activated to detect the moment corresponding to the maximum voltage of the weft yarn only via its activation by an operator. In this case, since the weft detection device is activated only when the machine is set or when the operator deems it necessary to do so, the energy consumption is reduced.
    In the embodiments illustrated above, the end faces 43a, 44a of the optical fiber 43 for transmitting light and the optical fiber 44 for receiving light, the sensor 40 for the comb, are turned towards the guide recesses 16a of the teeth 16 and the light-emitting device and the light-receiving device are provided on the proximal sides of the light-emitting optical fiber 43 and the optical-receiving fiber 44 light. The present invention is not limited to this configuration. For example, a light-emitting device and a light-receiving device may be provided on the support body 41 to provide an orientation facing the guide recesses 16a. In this case, the light-emitting device is electrically connected to a power source for the light-emitting device via a conducting wire and the light-receiving device is connected to a light-emitting device. signal processing (an amplifier and the bandpass filter 47). In place of the single light emitting optical fiber 43 and the single light receiving optical fiber 44, the internal comb sensor 40 may encompass two or more light emitting optical fibers 43 and two In this case, the distal ends of the light-emitting optical fibers 43 and the light-receiving optical fibers 44 may be easily disposed in the support body 41 in the direction oscillation of weft yarn Y in the ringworm passage 17.
    Accordingly, the examples and embodiments of the present invention are to be construed as illustrative and not restrictive, and the invention is not limited to the details provided herein, but may be modified in the scope and equivalence of the appended claims.
    权利要求:
    Claims (7)
    [1]
    An air jet type weaving machine comprising the weft detection device, the air jet type weaving machine including: a main nozzle for insertion of the weft yarn; a number of auxiliary nozzles for insertion of the weft yarn; and a comb which includes a number of teeth which are arranged in the insertion direction of the weft thread, wherein the teeth each have a guide recess; the guide recesses of the teeth define a comb passage; the insertion of the weft yarn through the comb passage is implemented by an air jet supplied by the main nozzle and the secondary nozzles; the frame wire detecting device being characterized by: a sensor which detects a weft yarn in a host of warp yarns at the comb passage in an area extending between the center of the comb passage and the main nozzle; a signal processing device which receives output signals from the sensor and passes output signals having frequencies in the range of 0.5 kHz to 20 kHz; and an estimation section which estimates the moment corresponding to the maximum voltage of the weft yarn based on the output signals provided by the signal processing device.
    [2]
    An air jet type weaving machine comprising the weft detection device according to claim 1, wherein the signal processing device passes output signals having frequencies in the range of 2. kHz at 5 kHz.
    [3]
    An air jet type weaving machine comprising the weft detection device according to claim 1 or 2, wherein the estimation section is configured to: calculate, for each jet pressure of the auxiliary nozzles, an average voltage by averaging the integrated voltages of a number of weft insertions, each integrated voltage being obtained by integrating an output voltage of the sensor at each weft insertion; to obtain a relationship between the jet pressure of the auxiliary nozzles and the average voltage; derive a linear approximation equation from the relationship between the jet pressure of the auxiliary nozzles and the weft angle under maximum tension conditions, which is obtained through naked eye monitoring using a strobe, and the relationship between the jet pressure of the auxiliary nozzles and the average voltage; and estimating the moment corresponding to the maximum voltage from the average voltage obtained via the integration and via the linear approximation equation.
    [4]
    An air jet type weaving machine comprising the weft detection device according to claim 1 or 2, wherein the estimation section is configured to estimate the moment corresponding to the maximum tension as being the same. when the values of the output signals from the signal processing device fall to a predetermined threshold value.
    [5]
    An air jet type weaving machine comprising the weft detection device according to claim 4, wherein the threshold value is set based on the apparent diameter of the weft yarn.
    [6]
    An air jet type weaving machine comprising the weft detection device according to any one of claims 1 to 5, further comprising a full-wave rectifier and an averaging circuit, which are disposed between the signal processing device and the estimation section.
    [7]
    An air jet type weaving machine comprising the weft detection device according to any one of claims 1 to 6, wherein the estimation section is configured to: receive, via an analog converter / digital, the output signals of the signal processing device at a sampling frequency of a number of tens of kHz by insertion of weft yarn and for a measuring time of a number of tens of milliseconds per insertion weft yarn; and calculating an average value of a number of tens to 200 insertions of weft threads; and averaging the time series data based on the result.
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    同族专利:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP2015-066994|2015-03-27|
    JP2015066994|2015-03-27|
    JP2015236005A|JP6367784B2|2015-03-27|2015-12-02|Weft detection device for air jet loom|
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