• 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 a weft yarn detection apparatus which includes an insertion nozzle (11), a number of secondary nozzles (15) arranged at predetermined intervals along the passage of the loom. inserting the weft thread, a comb formed by a number of comb blades (55). Each comb blade (55) has a guide recess (59), the weft yarn (Y) being inserted through the weft insert passage formed by the guide recesses (59) via injection. air through the weft insert nozzle (11) and secondary nozzles (15). The weft yarn detecting apparatus includes a weft yarn sensor (62) which is disposed at a location within a weave width (TL) and which is provided with a photoelectric sensor including a screen projector. light (65) and a light receiver (66), and a determination unit (16) which determines whether there is an abnormality at the front end of the weft yarn (Y) based on a level of amount of reflection light received by the light receiver (66).
    公开号:BE1026923B1
    申请号:E20195986
    申请日:2019-12-24
    公开日:2021-02-22
    发明作者:Yagi Daisuke
    申请人:Toyota Jidoshokki Kk；
    IPC主号:
    专利说明:

    AIR JET TYPE WEAVING LOBBY WITH A DETECTION DEVICE | OF WEFT
    BACKGROUND ART The present invention relates to an air jet type loom including a weft yarn detection apparatus. It is well known that an air jet type loom which includes a weft yarn detecting apparatus comprises a main nozzle, a secondary nozzle and an end sensor disposed outside a width. of weaving on an end opposite to the main nozzle, and a weft yarn sensor disposed in the weaving width (see, for example, Japanese Patent Application Publication No. 2018-111906). According to the air jet type loom including the weft yarn detecting apparatus disclosed in the above-mentioned publication, when the number of the unwinding signals generated by the bubble sensor is normal and when the yarn weft yarn Y is not detected by either the end sensor or the weft yarn sensor, a type of weft yarn insertion failure is determined as a failure that the yarn weft forms a loop. Also, when the number of unwinding signals generated by the bubble sensor is normal, and when a weft yarn is detected by the weft yarn sensor, but not by the end sensor, a type of failure of Weft thread insertion is determined to be an end arrival failure. That is, weft yarn detecting apparatus is able to determine whether the type of weft insertion failure represents a failure related to the arrival of the end or a failure related to the weft yarn forming. a loop.
    However, according to the weft yarn detecting apparatus of the publication, when an abnormality takes place only in a leading end of a weft yarn, that is, said end forms a loop, while the weft yarn is detected by the end sensor, such an anomaly may not be detected.
    When the weft thread which has an abnormality at the front end, such as a front end forming a loop, is inserted, there can be fear of a risk of reduction in the quality of the woven fabric.
    Patent application EP3,404,132 similarly discloses an air jet type loom including a weft yarn detection apparatus comprising a weft yarn insertion nozzle which injects a weft yarn in the direction. a weft thread insertion passage; a number of secondary nozzles arranged at predetermined intervals along the weft thread insertion passage; a ros or a comb formed by a number of | 15 comb blades arranged in a direction of insertion of the weft yarn, the comb blades each having a guide recess; wherein the weft yarn is inserted and moves through the weft yarn insertion passage formed by the guide recesses of said plural comb blades via air injection through the weft insertion nozzle. weft yarn and secondary nozzles; and a weft yarn sensor (62) which is disposed at a location within a weave width (TL) and which is provided with a photoelectric sensor including a light projector (65) and a light receiver ( 66) disposed closer to a woven fabric than the guide recess (59). The loom photoelectric sensor of this patent application is used only to determine the position of the weft thread in the guide recess.
    It is an object of the present invention to provide an air jet type loom including a weft yarn detection apparatus which is capable of detecting an abnormality which occurs in a forward end of a weft yarn, to know a front end that forms a loop. # 5 SUMMARY | In accordance with one aspect of the present invention, there is provided an air jet type loom which includes a weft yarn detecting apparatus. comprising a weft inserting nozzle which injects a weft thread into a weft inserting passage, a number of secondary nozzles which are arranged at predetermined intervals along the weft inserting passage. weft, and a ros or comb having a number of comb blades, the comb blades being linearly disposed in a direction of insertion of the weft yarn. The weft yarn is inserted and travels through the weft yarn insertion passage formed by the guide recesses of said plural blades of the comb via air injection through the main yarn insertion nozzle weft and secondary nozzles. The weft yarn detecting apparatus includes a weft yarn sensor which includes a light projector, which is disposed closer to a woven fabric than the guide recess, and a receiver, as well as a tracking unit. determination which determines whether or not a forward end abnormality occurs in the weft thread which has been inserted, based on a level of amount of reflection light which is projected from the projector of light, which is reflected by the weft thread and which is received by the light receiver. Other aspects and advantages of the present invention will become apparent from the description which follows, taken in conjunction with the accompanying drawings which illustrate, by way of example, the principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
    The present invention, together with its objects and advantages, can best be understood by reference to the following description of the forms of; presently preferred embodiment, together with the accompanying drawings: in which: to / 5 Figure 1 is a schematic view, showing the | configuration of an air jet type loom which includes a weft yarn detection apparatus in accordance with one embodiment of the present invention; Figure 2 is a perspective view of the air jet type loom of Figure 1, showing its main components; Fig. 3 is a schematic side view showing the positional relationship between a comb blade and a weft yarn sensor; Figure 4 is a schematic view showing the distribution of the amount of light emitted from the weft yarn sensor: Figure 5A is a schematic view showing a normal state of the insertion of the weft yarn. weft in which the weft yarn moves through a passage of the comb under normal conditions and Fig. 5B is a schematic table showing the relationship between the tension generated by a sensor and the crankshaft angle; and Figs. 7A, 7B and 7C are schematic illustrations showing an example of a weft yarn which has no abnormality in the leading end, an example of a weft yarn which has a loop formed in the front end. 'front end and an example of a weft yarn having a yarn ball formed in the front end, respectively.
    DETAILED DESCRIPTION OF EMBODIMENTS Hereinafter, an air jet type loom including a weft yarn detection apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings.
    In the description of the present embodiment, with respect to a weft yarn insertion direction in which a weft yarn is inserted into a shed of warp and is conveyed through a passage for the weft yarn, the term "Upstream" will be used to indicate the start end in the direction of weft insertion and the term "downstream" will be used to indicate the end opposite to the start end.
    First, the air jet type loom will be described. | As shown in Figure 1, the air jet type loom includes a weft thread inserter 10. The thread inserter of | Weft 10 includes a weft insert nozzle 11, a package | yarn feeder 12, a weft yarn measuring and storage device 13, | a comb 14, a number of secondary nozzles 15 for inserting the weft thread and a control device 16. | The yarn feed packaging 12 and the weft yarn measuring and storage device 13 are arranged upstream with respect to the weft yarn insertion nozzle 11. The weft yarn feed packaging 12 is arranged upstream. arranged upstream with respect to the weft thread insertion nozzle 11. The weft thread measuring and storage device 13 is disposed upstream with respect to the weft thread insertion nozzle 11 and is mounted on a support (which is not shown) which is disposed adjacent to the frame of the air jet type loom.
    The weft yarn measuring and storing device 13 includes a winding arm (not shown) which pulls out a weft yarn Ya from the weft yarn feed package 12, a reel of yarn. storage 17 on which the weft yarn Y is wound up and stored, a lug 18 for stopping the weft yarn and a bubble sensor 19. The weft yarn Y is pulled out from the yarn feed package 12 by means of the rotation of the winding arm.
    The weft yarn Y pulled out from the yarn feed package 12 is wound around the storage drum 17 to be stored on the storage drum 17. The lug 18 intended to stop the weft yarn is wound up around the storage drum 17. activated with electromagnetic force. The bubble sensor 19 detects the unwinding of the weft yarn Y from the weft measuring and storage device 13 during the insertion of the weft yarn. | The lug 18 for stopping the weft yarn of the weft measuring and storage device 13 is electrically connected to the control device | 16. The bubble sensor 19 is also electrically connected to the control device 16. During the commissioning of the air-jet type loom, the control device 16 generates an instruction signal in operation. direction of the lug 18 intended to stop the weft thread, with the aim of stopping and releasing (unwinding) the weft thread Y based on a predetermined moment corresponding to the insertion of the weft thread and on a detection signal emitted by the bubble sensor 19. It should be indicated that the moment corresponding to the activation of the lug 9 intended to stop the weft thread to stop the weft thread Y is set according to the number of turns that the weft yarn Y has to make to wrap itself around the storage drum 17, which is required for storing a predetermined length of the weft yarn Y corresponding to the weaving width TL of the type loom air jet.
    The detection signal emitted by the bubble sensor 19 corresponds to a signal (unwinding signal) which releases the weft yarn Y from the storage drum 17. The control device 16 is electrically connected to an encoder 22 which is intended for obtaining a signal indicative of an angle of rotation of the loom. The controller 16 recognizes the detection signal emitted by the bubble sensor 19 as the moment corresponding to the unwinding of the weft yarn based on the signal of the angle of rotation of the loom obtained at. from encoder 22. Encoder 22 is provided for a drive motor (not shown) which rotates the main shaft of the air jet type loom. The controller 16 is connected to a display device 23 on which various information can be displayed and in which various data can be entered. Controller 16 includes a processor (which is not shown) which executes various programs and calculation processes, as well as a memory (which is not shown). The weft inserting nozzle 11 includes a tandem nozzle 24 which pulls a weft yarn Y from the storage drum 17, as well as a main nozzle 25 which inserts a weft yarn Y. The tandem nozzle 24 and the main nozzle 25 are disposed near one end of a flapper 43 which is disposed on the side of the weft yarn measuring and storing device 13. In the air-jet type loom , the weft yarn YL is inserted by injection of air from the main nozzle 25 and from the secondary nozzles 15. A brake 26 is provided to act as a braking device and is arranged upstream with respect to the nozzle tandem 24 in order to exert a braking on the weft thread Y before the end of the insertion of the weft thread. The brake 26 can be achieved by means of a mechanical-type brake or a pneumatic-type braking mechanism. The tandem nozzle 24, the brake 26, the weft measuring and storing device 13 and the yarn feed pack 12 are attached to a support (which is not shown) which is mounted on a frame ( which is not shown) of the air jet type loom or on a floor surface (which is not shown).
    The main nozzle 25 is connected via a conduit 27 to a main valve 28. The main valve 28 is connected to a main tank for Fair 30 via a conduit 29. The tandem nozzle 24 is connected. to a tandem valve 32 via a conduit 31. Thus, the tandem valve 32 is connected to the main reservoir for air 30 which is commonly used for the main valve 28 via a conduit 33.
    The main air reservoir 30 is connected to a main pressure measuring device 35 via a conduit 34. The main pressure measuring device 35 is connected to a main regulator 37 via the intermediary. a conduit 36. The main regulator 37 is connected to a source pressure measuring device 39 via a conduit 38. The source pressure measuring device 39 is connected to a pressure source of air 41 through duct 40. A filter 42 is provided for duct 40. Air pressure source 41 is mounted in a weaving mill in the usual manner for the # 5 looms of the world. air jet type. Compressed air supplied from the source | air pressure 41 is set to a specific pressure through the main regulator 37 and is stored in the main air tank 30. The compressed air pressure, which is supplied to the main air tank 30, is constantly monitored by the main pressure measuring device 35.
    As shown in Figure 2, the air jet type loom includes flap 43 which extends in a width direction of the frame. A number of secondary nozzles 15 are arranged at intervals in the weft insertion direction on the flap 43. Thus, the secondary nozzles 15 are arranged at predetermined intervals along the weft insertion path. . According to the present embodiment, twenty-four secondary nozzles 15 are provided, as shown in Fig. 1, but only three secondary nozzles 15 are shown in Fig. 2 for the sake of ease of description.
    As shown in Fig. 2, a support groove 44 is formed in the front surface of the leaf 43 for mounting the secondary nozzles 15. The support groove 44 extends along the longitudinal direction of the leaf 43 and has a cross section having a T-shaped configuration. Further, a mounting groove 45 is formed in the upper surface of the leaf 43 for mounting the comb 14. The mounting groove 45 extends in the longitudinal direction of the leaf 43 and has a cross section having a trapezoidal shape configuration. The secondary nozzles 15 are attached to the flaps 43 via the support in such a way that the positions of the secondary nozzles 15 can be adjusted. The secondary nozzles 15 are capable of reciprocating relative to the crowd of warp formed by the threads of | T chain, in harmony with the swinging movement of the leaf 43 in the forward-backward direction. | The secondary nozzles 15 are subdivided into six groups, each group {5 comprising four secondary nozzles 15. There are also six valves | secondary 46 correspondingly to each group. The secondary nozzles 15 of each group are connected to their associated secondary valves 46 through a conduit 47. Each secondary valve 46 is connected to a common secondary reservoir for Fair 48.
    The secondary air reservoir 48 is connected to a secondary pressure measuring device 50 via a conduit 49. The secondary pressure measuring device 50 is connected to a secondary regulator 52 via the intermediary. a duct 51. The secondary regulator 52 is connected via a duct 53 to a duct 36 which is connected between the main pressure measuring device 35 and the main regulator 37. Compressed air supplied from the air pressure source 41, which is set to a specific pressure through the secondary regulator 52, is stored in the secondary reservoir for air 48. The pressure of the compressed air, which is supplied in the direction of the secondary air reservoir 48, is constantly monitored by means of the secondary pressure measuring device 50.
    The main valve 28, the tandem valve 32, the secondary valves 46, the source pressure measuring device 39, the main pressure measuring device 35, the secondary pressure measuring device 50 and the brake 26 are connected. electrically to the control device 16. The moments corresponding to the activation as well as the durations of the activation of the main valve 28, of the tandem valve 32, of the secondary valves 46 and of the brake 26 are preselected in the control device. control 16. Further, the controller 16 receives detection signals from the source pressure measuring device 39, the primary pressure measuring device 35 and the secondary pressure measuring device 50.
    The controller 16 generates instruction signals to the main valve 18 and the tandem valve 32 before the time corresponding to the start of the weft thread insertion, at which the lug 18 for stopping the weft thread is. activated in such a way that air is injected from the main nozzle 25 and from the tandem nozzle 24, respectively. The control device 16 also generates an instruction signal in the direction of the brake 26 before the moment corresponding to the arrival of the front end of the weft thread, at which the lug 18 intended to stop the weft thread stops the thread. Y weft yarn on the storage drum 17. The brake 26 applies a brake to the Y weft yarn which: travels at high speed so as to reduce the yarn travel speed | weft yarn, thereby releasing the impact on the weft yarn Y at the time | corresponding to the arrival of the front end of the weft thread. Controller 16 includes a processor (not shown) and memory (not shown). Data relating to various fabric related conditions and various weaving related conditions is stored in controller 16. Fabric related conditions encompass the types of yarn that are used for the weft yarn Y, such as material and yarn. the count, the density of the weft thread, the types of thread used for the warp thread, such as the material and the count, the density of the warp thread, the weaving width and the weave of the fabrics which are to be be woven. The conditions related to weaving include the rotational speed of the loom, the pressure of the compressed air in the main tank for air 30 and in the secondary tank for air 48, the degree of opening of the valve. main 28 and tandem valve 32, the time corresponding to the start of the insertion of the weft yarn and the target arrival time corresponding to the leading end of the weft yarn, and the like. The controller 16 corresponds to the determination unit which determines whether or not there is an anomaly located at the front end in the weft yarn Y, which has been inserted. The process of determining a leading end abnormality in weft yarn Y will be described later. Next, the comb 14 will be described. As can be seen in Figure 1, the comb # 5 14 is made from a number of comb blades 55 which are arranged # linearly in the direction of wire insertion. of weft on the leaf 43. | As can be seen in Figure 3, the comb 14 includes a retaining frame | lower 56, an upper holding frame 57, a pair of main comb blades (not shown) disposed on opposite ends of the lower holding frame 56 and upper holding frame 57, and said plural comb blades 55 , each having a plate-like configuration. The comb blades 55 are held by the lower retaining frame 56 and by the upper retaining frame 57. As can be seen in Figure 2, the | Lower retaining frame 56 which holds the comb blades 55 is inserted into the mounting groove 45 of the leaf 43 and is secured to the leaf 43 with a wedge-shaped element 58.
    A forward facing guide recess 59 is formed in each of the comb blades 55. The guide recess 59 is formed by the upper side portion 59A, the lower side portion 59B, and the lower side portion 59B. base portion 59C of each of the comb blades 55. As shown in Fig. 2, the guide recesses 59 which are formed in said plural comb blades 55 are continuously disposed along the direction of insertion of weft yarn, which forms a comb passage 60 through which the weft yarn Y moves in the reed 14. The reed passage 60 corresponds to the weft yarn insertion passage of the present disclosure. In other words, the comb passage 60 serving as the weft thread insertion passage is produced by means of the guide recesses 59 of the comb blades 55. The warp threads T are inserted between the blades of the weft. comb 55 and the warp threads which have been inserted between the comb blades 55 form a warp line.
    As can be seen in Figure 1 and Figure 2, an end sensor 61 | is disposed downstream of the comb passage 60. Thus, the end sensor 61 is disposed in the comb passage 60 at a location which is opposite to the main nozzle 25 and which is located outside the width of weaving TL du | 5 air jet type loom. The end sensor 61 is a reflection type photoelectric sensor, including a light projector (not shown) and a light receiver (not shown). The end sensor 61 is disposed at a location outside the weaving width TL, in such a way that the leading end of the weft yarn Y which is inserted in the absence of failure can be detected. . The end sensor 61 is electrically connected to the control device 16. The end sensor 61 generates a detection signal which indicates the detection of the weft yarn Y, which indicates the arrival of the weft yarn Y at a location which can be detected by the end sensor 61. The controller 16 recognizes a detection signal which indicates the detection of the weft yarn Y by the end sensor 61 as the time corresponding to the arrival of the front end of the weft yarn, at which the front end of the weft yarn Y arrives at the detectable position of the end sensor 61 based on the signal of the angle of rotation of the loom that l 'we get from encoder 22.
    A weft yarn sensor 62 is disposed upstream of the end sensor 61 in the comb passage 60 within the weave width TL. According to the present embodiment, the weft yarn sensor 62 is disposed within the weaving width TL in the comb passage 60 at a location between the position corresponding to the front end of the weft yarn at a position between the position corresponding to the front end of the weft yarn. when the main nozzle 25 ends the injection of air and the position corresponding to the forward end of the weft yarn at a time when the brake 26 applies braking. The weft yarn sensor 62 is electrically connected to the controller 16. The controller 16 and the weft yarn sensor 62 correspond to the weft yarn detection apparatus of the present disclosure.
    The end sensor 61 and the weft thread sensor 62 are attached to the flap 43 via a support block (which is not shown) of a | 5 such that the respective positions of the end sensor 61 and the weft thread sensor 62 can be adjusted. The end sensor 61 and the weft thread sensor 62 are mounted on the flap 43, the end sensor 61 and the weft thread sensor 62 being inclined in the direction of the comb 14 while still being able to perform an entry and exit movement with respect to the warp shed of the warp yarn T from a position between the lines of the warp yarn T in harmony with the oscillating movement of the leaf 43 in its forward direction -back. As shown in Fig. 3, the weft yarn sensor 62 is disposed oriented in the direction of the comb passage 60 and is attached to the flap 43 so as not to interfere with the woven fabric W as it moves in and out. underside of woven fabric W when threshing. The air jet type loom is provided with a heddle frame 63 which guides the woven fabric W towards the front of the comb 14.
    As shown in Fig. 3 and Fig. 4, the weft yarn sensor 62 is provided by a reflective type photoelectric sensor which includes a light projector 65 and a light receiver 66. A portion 67 serving as the body of the Weft yarn sensor 62 has a tubular shaped configuration and has two receiving holes 68. The light projector 65 and light receiver 66 are optical fibers which are housed in the receiving holes 68, respectively.
    As shown in Figure 3, the weft yarn sensor 62 has a holding device 69 which is held by a support 70. The support 70 is fixed to the leaf 43 by tightening a bolt 71 inserted into the support groove 44 of the. leaf 43, as well as a nut 72. By adjusting the position of the holding device 69
    | held by the support 70, the positions of the light projector 65 and of the light receiver 66 are adjusted. By loosening the nut 72, the weft yarn sensor 62 can be moved in the longitudinal direction of the leaf 43, which allows to adjust the position of the weft thread sensor 62 in the longitudinal direction of the leaf | 43. 9 As shown in Fig. 5 and Fig. 6, the light projector {65 and the light receiver 66 have ends 73, 74, respectively, which are disposed closer to the woven fabric W than the ends of the woven fabric W. The guide recess 59. The light projector 65 and the light receiver 66 are disposed in the body portion 67, such that the respective ends 73 and 74 are disposed in the vertical direction. The end 73 of the light projector 65 is disposed upstream of the end 74 of the light receiver 66. During the commissioning of the air jet type loom, light is projected. from the end 73 of the light projector 65 towards the comb passage 60. Said light emanating from the end 73 of the light projector 65 is reflected by the weft yarn Y which travels through the comb passage 60. Part of the light reflected by the weft yarn Y is received by the end 74 of the light receiver 66.
    As shown in Figure 1, the reflected light received by the end 74 of the light receiver 66 is input to a charge amplifier 75. In the charge amplifier 75, the input light is transformed into an electrical signal by an electrical signal. photodiode and the electrical signal is amplified and is sent to a band pass filter 76. The band pass filter 76 allows an output signal in the range between 2 and 5 kHz of the output signals to pass through it.
    Further, the output signals from the band pass filter 76 are input to the controller 16 through an analog-to-digital converter 77. The controller 16 estimates when the value of the output signal from the controller. band pass filter 76 decreases to a threshold predetermined as being the full span time period corresponding to weft yarn Y. Specifically, controller 16 implements processing such as a calculation of a absolute value, by inputting an analog signal which has been processed by the bandpass filter 76 through the converter | analog-to-digital 77. Controller 16 stores a program which | calculates a threshold for an estimate of an anomaly located at the front end in the weft yarn Y.
    As shown in Figure 4, the amount of light projected from the end 73 of the light projector 65 is distributed in concentric circles, which decrease as one moves away from the center of the sensor. weft yarn 62, as shown from the ends 73, 74 of the light projector 65 and the light receiver 66. Reference numerals Z1, Z2, Z3, Z4 denote the uppermost area, the elevated area, the uppermost area. middle zone and lower zone, respectively. Specifically, the uppermost area Z1 in which the distribution of the amount of light is highest is located in an area which is closest to the center of the weft yarn sensor 62, and the elevated area Z2, in which the light distribution is less than that of the zone situated the highest Z1, is disposed outside the zone situated the highest Z1. The middle area 23, in which the distribution of the amount of light is less than that of the high area 22, is disposed outside the high area Z2, and the lower area Z4, in which the distribution of the amount of light is light is less than that of the middle zone Z3, is located outside the middle zone Z3. In FIG. 5A, which shows a cross-sectional view of the weft yarn sensor 62, a large part of the uppermost zone Z1 is disposed further, with respect to the base portion 59C of the guide recess 59, that a significant part of the elevated zone Z2 and that a significant part of the middle zone Z3. The elevated area Z2 surrounds the entire uppermost area Z1 and much of the elevated area Z2 is located closer to the base portion 59C of the guide recess 59 than a portion | of the highest zone Z1. The middle zone Z3 surrounds the whole | of the elevated zone Z2, and a substantial part of the middle zone Z3 is located closer to the base portion 59C of the guide recess 59 than the | 5 high zone Z2. The lower zone Z4 substantially surrounds the entire # of the middle zone Z3. Part of the lower zone Z4 is located continuously | with the base portion 59C of the guide recess 59. The strength of the electrical signal, determined based on the reflection light received by the light receiver 66, i.e. the level of the light. quantity of the reflecting light, is proportional to the distribution of the quantity of light.
    Hereinafter, a commissioning of the weft yarn detection apparatus of the air jet type loom according to the present embodiment will be described. The main nozzle 25, the secondary nozzles 15, and the comb 14 are disposed on the flapper 43 and together oscillate by reciprocating in the forward-backward direction of the jet type loom. air. The weft yarn Y is inserted into the warp shed by the air injected from the main nozzle 25 and from the secondary nozzles 15. With the oscillating movement of the flapper 43, the secondary nozzles 15 move towards it. 'inside and out of the warp shed, from the position between the lines of the warp yarns T, and inject compressed air into the warp shed.
    As can be seen in Fig. 5A, when the front end of the weft yarn Y passes through the area where light is projected from the light projector 65 of the weft yarn sensor 62, the front end of the weft yarn sensor 62 weft yarn Y passes through the lower area Z4 of the light quantity distribution and passes through a part of the comb passage 60 where it is closer to the base portion 59C of the guide recess 59 than the weft yarn portion 59C of the guide recess 59. middle zone Z3. In Fig. 5B, a relationship between the crankshaft angle and the strength of the electrical signal is shown based on the reflection light received by the light receiver 66 from the weft yarn sensor 62 during commissioning of the weft yarn sensor 62. air-jet type loom, while the air-jet type loom is in the state as shown in Fig. 5A. In other words, in Fig. 5B, we show the relationship between the crankshaft angle and the voltage generated by the weft yarn sensor 62 (the output voltage of the signal) which corresponds to the level of the quantity of # 5 light of reflection light.
    # As shown in Fig. 5B, the voltage generated by the weft yarn sensor 62 increases towards the voltage V1 rapidly in a period of time in which the leading end of the weft yarn Y passes through a area in which light is projected, i.e. in which light is projected from the light projector 65 of the weft yarn sensor
    62. Once the voltage V1 has been reached, the voltage generated by the weft thread sensor 62 remains at the level of the voltage V1. The period of time during which the tension increases rapidly corresponds to the moment at which the front end of the weft yarn Y arrives in the area in which light is projected, i.e. in which light is projected from the light projector 65. The period of time during which the voltage is maintained: at the level of the voltage V1 indicates the duration of the passage through the zone in which the light is projected from the part of the weft yarn Y other than the front end. It | It should be noted that the voltage V1 at which the voltage generated by the weft yarn sensor 62 maintains a constant value increases as the weft yarn Y passes through the part of the lower zone Z4 which is closer to the middle zone 23, since this increases the level of the amount of light. In other words, the voltage V1 increases and decreases depending on the areas of the distribution of the amount of light through which the weft yarn Y passes. As the voltage generated by the weft yarn sensor 62 increases to reach the voltage V1 and is maintained at this constant value, via the front end of the weft yarn Y and the part of the weft yarn Y other than the front end, which is obtained based on the level of the amount of light, as shown in FIG. 5B, the controller 16 determines that there is no abnormality at the front end, such as a front end | forming a loop in the weft yarn Y. The controller 16 represents the result of its determination on the display device 23. Further, when the end sensor 61 detects the leading end of the yarn | 5 Weft Y, controller 16 determines that normal weft insertion has occurred in the absence of a weft insertion failure. In the case where the front end of the weft yarn Y has not been detected by the end sensor 61, it is very likely that one is faced with a problem of too short pick, that is - that is, the weft yarn does not manage to reach the end sensor 61. In FIG. GA, a state is shown in which the weft yarn Y forming the loop R in its front end passes through the lower zone Z1 while crossing; the area in which light is projected, i.e. in which light is projected from the light projector 65 of the weft yarn sensor
    62. In Fig. 6B, the relationship between the crankshaft angle and the tension generated by the weft yarn sensor 62 during commissioning of the air jet type loom is shown. ; The weft yarn Y which has no abnormality at its front end is shown in Fig. 7A, while the loop R is formed in the front end of the weft yarn Y in Fig. 7B. The weft thread shown in Figure 7C has a ball of thread G formed in the front end. The weft yarn having the ball of yarn G represents one type of a leading end abnormality, which develops from the loop R shown in Figure 7B. These anomalies in the Y weft yarn, i.e. the Y weft yarn having the loop R and the ball of the G yarn, are considered to be caused by interference between the weft yarn Y and the warp yarn. T during the insertion of the weft yarn, by an injection of air which takes place at an inappropriate time, by an inappropriate direction of the injection of air, and the like.
    As shown in Fig. 6B, the tension generated by the weft yarn sensor 62 increases towards the tension V2 rapidly at a rate at which the forward end of the weft yarn Y begins to pass through the area in. which light is projected, i.e. in which light is projected from the light projector 65 of the weft yarn sensor 62, instantly drops to the voltage V1, and is held at the level of # voltage V1. The tension generated by the weft thread sensor 62 increases by | quickly until the voltage V2 is reached and then decreases to the voltage V1 when the front end of the weft yarn Y arrives in the area in which light is projected, that is to say in which light is projected from the light projector 65, and the time during which the voltage generated by the weft yarn sensor 62 remains at the level of the voltage V1 corresponds to the time of passage through the area in which the light is projected from the part of the weft yarn Y other than the front end.
    Since the front end of the weft yarn Y shown in Figure 6B has the loop R, which increases the reflection of light, there is a large difference in the amount of light between the l the front end of the weft yarn Y and the part of the weft yarn Y other than the front end. The voltage V2 exceeds a value of the voltage by 1.5 times the voltage V1.
    When the voltage V2 exceeds the value of the voltage by 1.5 times the voltage V1, as shown in Fig. 6B, the controller 16 determines that the weft yarn Y is in an abnormal state, such as 'a front end forming a loop. Accordingly, the controller 16 determines the abnormality of the weft yarn Y by basing its determination on the level of the amount of light detected by the weft yarn sensor 62, even when the front end of the weft yarn Y has been detected by the end sensor 61. The controller 16 represents the result of the determination made by the controller 16 on the display device 23.
    According to the present embodiment, the weft yarn sensor 62 is disposed within the weaving width TL of the comb passage 60 and at a location between the position of the forward end of the weft yarn at the time when the main nozzle 25 terminates the air injection and the position of the front T end of the weft yarn at the moment when the brake 26 applies a brake, when facing a yarn insertion of frame in the absence of failure. This feature makes it possible to recognize the abnormality at the front end of the weft yarn Y during weft thread insertion, even if the abnormality at the front end has been resolved after braking by. through the brake 26.
    As already described, the air jet type loom including the weft yarn detecting apparatus according to the present embodiment includes the weft inserting nozzle 11, the weft inserting nozzle 11, secondary 15, the comb 14, the controller 16 and the weft yarn sensor 62. The controller 16 corresponds to the determining unit which determines whether or not the abnormality at the front end of the weft thread inserted Y is topical. This is to determine whether or not the abnormality at the front end of the weft yarn Y takes place based on the level of the amount of light that is projected from the light projector 65, which is reflected. by the weft yarn YL and which is received by the light receiver 66.
    The generation-type loom including the weft yarn detecting apparatus according to the present embodiment achieves the following effects.
    {1} The light receiver 66 of the weft yarn sensor 62 receives the light reflected from the weft yarn Y, while the weft yarn Y passes through the area where light is projected near the light receiver 66. When the weft yarn Y having an abnormality at its front end passes through the area in which light is projected, the light receiver 66
    | receives light reflected from the front end of the Y weft yarn having an anomaly.
    After the weft yarn Y having an abnormality at its front end has passed through the area in which light is projected, the part of the weft yarn Y which does not have an abnormality (i.e. the normal part of the {5 weft yarn Y other than the leading end) passes through the area where the | light is projected.
    The level of the amount of light received by the weft yarn sensor 62 corresponding to the front end of the weft yarn Y differs from the level of the amount of light received by the weft yarn sensor 62 corresponding to the portion of the yarn frame Y other than the front end.
    The controller 16 determines whether or not an abnormality at the front end of the weft yarn Y exists based on the level of the amount of light received by the light receiver 66. {2) The Weft yarn detecting apparatus of the present embodiment determines a front end forming a loop when the loop R is formed in the front end of the weft yarn Y and determines a ball of yarn in the front end when the ball of the weft yarn Y is formed. yarn is formed in the front end of the weft yarn Y. {3} The controller 16 determines an abnormality at the front end of the weft yarn Y by comparing the level of the amount of light corresponding to the front end of the weft yarn Y and the level of the amount of light corresponding to the part of the weft yarn Y other than the front end.
    Accordingly, the weft yarn detecting apparatus of the present embodiment determines whether there is an abnormality at the front end of the weft yarn Y when the controller 16 compares the level of the amount of. light corresponding to the front end of the weft yarn Y and the level of the amount of light corresponding to the part of the weft yarn Y other than the front end.
    | {4} The weft thread sensor 62 is disposed within the weaving width TL of the weft thread insertion passage and at a location between the position of the forward end of the weft thread Y at the time when the wire insertion nozzle of; frame 11 ends the injection behind and the position of the front end of the | 5 weft yarn Y at the moment when the brake 26 applies braking.
    Thus, the weft yarn sensor 62 detects a weft yarn Y which is free from the influences of the compressed air injected from the main nozzle 25 and the braking effect of the weft yarn Y through the brake 26. Thus, the weft yarn detection apparatus (controller 16) determines whether an abnormality is encountered at the front end of weft yarn Y before brake 26 applies braking. on the weft yarn.
    Accordingly, even in the case where the abnormality at the front end of the weft yarn Y is resolved through braking applied by the brake 26, such weft yarn Y can be determined to be a Y weft yarn which has experienced an abnormality at its forward end during weft insertion by determining abnormality at the forward end during the advancement of the Y weft yarn. { 5} By combining the determination of the weft yarn insertion failure using the end sensor 61 and the determination of the abnormality at the front end of the weft yarn Y using the weft yarn Y sensor. Weft Thread - 62, whether or not a weft insertion failure is encountered or whether or not an abnormality is observed at the leading end, can be appropriately determined.
    The present invention is not limited to the embodiment which has been described above.
    Its intention is to include various modifications and improvements within the scope of this disclosure as described below.
    Although it has been described that the determining unit determines whether or not an abnormality exists at the forward end of the weft thread by comparing the values of the tension generated by the sensor based on the level of the amount of reflected light which is received by the light receiver in the embodiment described above is not limited thereto. For example, the determination unit can be configured to determine whether or not an abnormality exists in the forward end of the weft yarn by comparing the integration values of the tension generated by the weft yarn sensor as the weft yarn sensor. 'is obtained based on the level of the amount of light. In such a case, the values are calculated over a period of time which extends from the time at which the leading end of the weft yarn is detected to a predetermined time. | Although unit of determination is configured to determine whether or not | No abnormality exists in the front end of the weft yarn based on the level of the amount of light at a time when the brake applies braking to the weft yarn in the embodiment described above, it is not. is not limited to it. For example, the determination unit can be configured to determine whether or not an abnormality exists in the front end of the weft yarn | 15 & a moment which is after the application of braking by the brake. In this case, the determining unit can determine the existence of an abnormality in the weft yarn, even in a case in which the weft yarn has no abnormality at its front end, before the brake applies braking, and the existence of an anomaly located at the front end of the weft thread, after application of a braking to the weft thread by the brake.
    The anomaly at the front end is not limited to the front end forming a loop and the front end forming a ball of yarn, as mentioned above. The front end defect includes an untwisted front end, a knotted front end, and the like. In a case that the existence of an abnormality at an untwisted front end or an abnormality of a knotted front end exists, the determining unit can determine whether or not there is a related abnormality. the front end of the weft yarn based on the level of the amount of light received by the light receiver.
    Although only one weft yarn sensor is provided in the embodiment described above, the number of weft yarn sensors is not limited to one, the weft yarn detecting apparatus is not limited to one. frame which can encompass a number of; weft yarn sensors.
    In this case, whether or not there is an abnormality of € 5 at the front end of the weft thread can be determined more precisely.
    权利要求:
    Claims (4)
    [1]
    An air jet type loom including a weft yarn detecting apparatus comprising: a weft inserting nozzle (11) which injects a weft yarn (Y} in the direction of a weft. weft thread insertion passage; a number of secondary nozzles (15) arranged at predetermined intervals along the weft thread insertion passage; a ros or comb formed by a number of comb blades ( 55) disposed in a direction of insertion of the weft yarn, the comb blades (55) each having a guide recess (59); into which the weft yarn (Y) is inserted and moves through the passage d insertion of the weft thread formed by the guide recesses (59) of said several comb blades (55) via air injection through the weft thread insertion nozzle {11} and secondary nozzles {15}; and a weft yarn sensor (62) which is disposed at a location within a weaving width (TL) and which is provided with a photoelectric sensor including a light projector (65) and a light receiver (66) disposed closer to a woven fabric than the guide recess (59); characterized in that the weft yarn detecting apparatus includes: a determination unit (16) which determines whether or not an abnormality exists at the leading end of the weft yarn (Y) which has been inserted, based on a level of amount of reflective light which is projected from the light projector (65), which is reflected by the weft yarn (Y}, and which is received by the light receiver (66).
    [2]
    2. Air jet type loom including the weft yarn detection apparatus according to claim 1, characterized in that: the abnormality at the front end of the weft yarn (Y } represents a front end that has formed a loop.
    [3]
    3. Air jet type loom incorporating the | Weft according to claim 1 or 2, characterized in that: the determining unit (16) determines the abnormality at the front end by comparing a level of a quantity of light which is due to the front end of the weft yarn (Y) and the level of the amount of light due to a part of the weft yarn (Y) other than the front end of the weft yarn {y}.
    [4]
    The air jet type loom including the weft yarn detecting apparatus according to any one of claims 1 to 3, characterized in that: the weft yarn detecting apparatus includes a brake. (26) configured to apply braking to the weft yarn (Y) before weft yarn insertion occurs; and the weft thread sensor (62) is disposed in the weft insert passage (60) at a location between a position of the front end of the weft thread (Y} when the insert nozzle weft yarn (11) terminates air injection and a position of the weft yarn forward end (Y) when the brake (26) applies braking.
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    同族专利:
    公开号 | 公开日
    BE1026923A1|2020-07-23|
    JP2020109222A|2020-07-16|
    CN111411440A|2020-07-14|
    引用文献:
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    WO1998024957A1|1996-12-02|1998-06-11|Picanol N.V.|Method for the optical monitoring of weft yarn passed into a weaving shed and a weft break motion-stop|
    EP3348688A1|2017-01-13|2018-07-18|Kabushiki Kaisha Toyota Jidoshokki|Method for diagnosing weft insertion in air jet loom and apparatus for diagnosing weft insertion in air jet loom|
    EP3404132A1|2017-05-15|2018-11-21|Kabushiki Kaisha Toyota Jidoshokki|Weft detecting device for air-jet loom|
    JPH08261952A|1995-01-26|1996-10-11|Toyota Autom Loom Works Ltd|Woven fabric inspection method and device|
    JP2003342857A|2002-05-28|2003-12-03|Tsudakoma Corp|Method for treating weft in loom|
    SE528931C2|2004-08-24|2007-03-20|Eltex Sweden Ab|Monitoring device|
    JP6190250B2|2013-11-14|2017-08-30|株式会社豊田自動織機|Weft detection device for air jet loom|
    JP6776980B2|2017-03-29|2020-10-28|株式会社豊田自動織機|Weft detector for air jet loom|CN112410982A|2020-10-16|2021-02-26|苏州汇川技术有限公司|Weft detecting assembly, water jet loom and weft detecting method of water jet loom|
    法律状态:
    2021-04-23| FG| Patent granted|Effective date: 20210222 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2019000447A|JP2020109222A|2019-01-07|2019-01-07|Weft detector for air-jet loom|
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