• 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:
    A weft yarn detecting device in a jet type loom which injects a jet of fluid to insert a weft yarn through a shed formed by an upper warp yarn and a lower warp yarn and which then uses a weft yarn. comb provided on a burp for pushing the weft yarn for smoothing the fabric, which includes a weft yarn detector projecting and receiving light across the width of the fabric so as to face the flight path of the weft thread. The weft yarn detector has a detection area having a light producing area and a light receiving area. When the loom is in an angular position in which the front end of the weft yarn reaches the detection area, the upper warp yarn and the lower warp yarn are laid out outside the detection area and at the bottom. at least one area selected from the light projection area and the light receiving area is arranged in the crowd.
    公开号:BE1023209B1
    申请号:E2015/5477
    申请日:2015-07-28
    公开日:2016-12-21
    发明作者:Matsui Tadasumi；Seiki Kazuo；Ishikawa Hirohiko
    申请人:Kabushiki Kaisha Toyota Jidoshokki；
    IPC主号:
    专利说明:

    DEVICE FOR DETECTING A FRAME WIRE IN A TRADE MACHINE
    JET TYPE WEAVING
    BASIS OF THE INVENTION
    The present invention relates to a device for detecting a weft yarn in a jet-type loom, wherein a weft yarn is inserted by a fluid jet and the inserted weft yarn is beaten by a comb provided on a rot of the jet-type loom.
    The quality of a woven fabric largely depends on the flight conditions of the weft yarn. Japanese Unexamined Patent Application Publication No. 2010-209478 discloses a weft yarn detecting device having a light-transmitting optical fiber and a light-receiving optical fiber both of which are provided. on a limb acting as a support that moves inside and outside a trained crowd breaks warp threads. Referring to FIG. 6, in which the weft yarn detection device of the publication cited above is shown, the support member 51 of the weft yarn detection device is disposed in such an orientation as its pointed end faces the flight passage 53 for the weft thread (weft thread is not shown in the figure), which is formed by the guide recesses 2A of several comb blades 52. As it is 7A and 7B, the support member 51 is formed by a pair of body halves 51A and 51B which are connected to each other, and the optical fiber projecting the light 54 and the fiber Light-receiving optics 55 are exposed through an aperture 51C formed at the tip end of the support member 51. Each of the optical fibers 54 and 55 is comprised of a multi-mode optical fiber including a plurality of optical elements. me of fibers in the form of a beam. The end portion 56 of the support member 51 and the end surfaces of the optical fibers 54 and 55 are made with a smooth surface forming a convex curve, so that we obtain a detection of a weft yarn in the process of to fly without causing any damage to the warp threads.
    The support member 51 is made to be thin enough to pass through a series of warp threads and therefore the dimension (or diameter) of the optical fiber projecting light 54 and optical fiber receiving light 55 which are mounted in the thin support member 51 is restricted by the size (or thickness) of the support member 51.
    Referring to FIGS. 8A and 8B, in which we see a weft yarn detecting device which is revealed in the application indicated above, a light projection zone Al (or a detection zone) and a light receiving zone A2 (or a detection zone) are present in the flight passage 53 which is provided at the rear of an imaginary tangential line U which is parallel to the rear surface of the reign blade 52 and also tangential to the lower jaw portion 528 of the comb blade 52.
    The frame wire detecting device transmits a detection signal when it detects any wire present in the superimposed area between the light projection area A1 and the light receiving area A2, without taking into account the fact of whether it is a frame wire or a warp thread. Therefore, a detection of the weft yarn must be carried out in a state in which no warp yarn is present in the superimposed area between the light projection area A1 and the light receiving area A2.
    In the weft detection device according to Japanese Unexamined Patent Application Publication No. 2010-209478, wherein there is a risk of detecting a warp thread in the state in which a thread of chain is present in the superimposed zone in the guide recess 52A between the projection area of the light A1 and the light receiving area A2. Accordingly, a flying weft yarn must be detected when the loom is in an angular position such that no warp is present in the superimposed area in the guide recess 52A between the zone. the light receiving area A2 and the light receiving area A2 (for example at an angle of 96 ° or more) .In other words, the weft yarn can not be detected for a period of time which extends from the start of the insertion of the weft thread, that is to say the beginning of the injection by the main nozzle until a moment at which the angular position of 96 ° is reached by the loom. It should be noted that the letter T in FIGS. 8A and 8B denotes the upper weft yarn when the loom forms an angle of 96 ° with respect to its angular position.
    The present invention, whose starting point is none other than the above-mentioned problem, relates to a weft detection device including a light-transmitting and light-receiving weft detector which is movable so as to being able to enter and exit the warp-formed shed and enlarge the detectable range of the weft yarn towards the main loom nozzle relative to the prior art weft detection device.
    SUMMARY OF THE INVENTION
    In accordance with one aspect of the present invention, a weft yarn detection device is provided in a jet type loom which injects a jet of fluid to insert a weft yarn through a warp yarn mold. upper and lower warp yarn and then using a comb which includes a comb blade having a guide recess and which is provided on a bur to push the weft yarn for weaving the fabric. The weft yarn detection device includes a weft yarn sensor projecting and receiving light over the width of the fabric so as to face the weft passage of the weft yarn formed by the guide recess. The weft detector has a detection area having a light projection area and a light receiving area. When the loom is in an angular position in which the leading end of the weft thread reaches the detection zone, the upper warp yarn and the lower warp yarn are disposed outside the detection zone. and at least one of the light projection area and the light receiving area is disposed in the shed and is not present adjacent to a portion corresponding to the upper jaw of the comb blade and on a side opposite a rear surface of the comb blade through an intersection between the portion corresponding to the upper jaw of the comb blade and a tangential line which is parallel to the rear surface of the comb blade and which is also tangent to a portion corresponding to the lower jaw of the comb blade. In this case, the detection zone refers to an area in the flight passage of the weft yarn occupied by the light projected by the optical fiber of the weft detector, projecting light, in the case of the fiber optical projecting light and an area in the flight passage of the weft thread occupied by the light that can be received in the case of optical fiber receiving light. Other aspects and advantages of the invention will be apparent from the following description taken in conjunction with the accompanying drawings which illustrate by way of example the principles of the invention.
    BRIEF DESCRIPTION OF THE DRAWINGS
    Fig. 1 is a perspective view schematically showing an air jet type loom having a weft insertion device and a weft yarn detecting device in accordance with a form of embodiment of the present invention.
    FIG. 2 is a partially cutaway side view in which the positional relationship between a comb blade and a weft sensor of the weft detection device of FIG. 1 is schematically represented.
    FIG. 3A is a schematic view in which a light projection area of the weft detector of FIG. 2 is shown.
    FIG. 3B is a schematic view in which a light receiving area of the weft detector of FIG. 2 is shown.
    FIG. 4A is a partially cut away cross-sectional side view in which the weft detector of FIG. 2 is shown.
    Fig. 4B is a partially enlarged view of the weft detector of Fig. 4A.
    Fig. 5 is a diagram showing the relationship between detected waveforms of the weft detector and the angular position of the loom.
    Fig. 6 is a side view showing the relationship between the weft detector and the comb blade in accordance with the prior art.
    Fig. 7A is a front view of the weft detector of Fig. 6.
    Fig. 7B is a cross-sectional view taken along the line 1-1 of Fig. 7 A.
    Fig. 8A is a schematic view in which the operation of the weft detector of Fig. 6 is explained; and FIG. 8B is a schematic view in which the operation of the weft detector of FIG. 6 is also explained.
    DETAILED DESCRIPTION OF THE EMBODIMENTS
    A first embodiment of the present invention which is designed for use in an air jet loom will now be described with reference to Figs. 1-6.
    Referring to Figure 1, there is shown the air jet type loom which includes a main nozzle 11 for the insertion of a weft yarn, a plurality of secondary nozzles 12 to support the insertion of the yarn. weft and a comb 13 which is fixed on a rot 14. The comb 13 includes a plurality of comb blades 15 which are arranged in the insertion direction of the weft thread and which each have a guide recess 15A. The guide recess 15A of said plurality of comb blades 15 forms a passage 16 for the weft thread or a passage for the flight of the weft thread. Each secondary nozzle 12 is removably mounted on the rot 14 via a support block 17 so that the position of the secondary nozzle 12 can be adjusted. The secondary nozzles 12 are movable to be able to enter and exit a crowd formed by the warp threads T correspondingly to the oscillation movement of the rot 14.
    A plurality of weft detectors 20 that detect a weft yarn Y that is flying in the passage 16 for the weft yarn are mounted on the rot 14 via their corresponding support blocks 21 in such a way that the position of the weft detectors respective 20 can be set. The weft detectors 20 are arranged closer to the main nozzle 11 relative to the center of the width of the fabric. The weft detectors 20 are movable into and out of a crowd of the warp yarns correspondingly to the swinging motion of the pad 14. A weft yarn detector (not shown) which detects the arrival of the leading end of a weft yarn inserted at the end of the weft insertion range is mounted on the rot 14 in such a way that the position of the thread detector frame can be set.
    The weft detector 20 is arranged in such a way that the upper warp yarns and the lower warp yarns are arranged outside the detection area of the weft detector 20. The upper warp yarns are designated In this case, the warp yarns which are situated above the guiding recess 15A, and the lower warp yarns in this case refer to the warp yarns which are situated below the guiding recess 15A.
    Hereinafter, the weft detector 20 will be described.
    As shown in Figure 2, the weft sensor 20 includes a rod-shaped support member 22 which is attached to the support block 21 which in turn is attached to the rot 14. An end of the member serving as a carrier 22 is movable to enter and exit a shed formed between the T-warp yarns. As was the case in the weft detection device of the unexamined Japanese Patent Application Publication No. 2010 -209478, the support member 22 includes a pair of body halves 22A and 22B which are connected to each other. As shown in Figs. 4A and 4B, a gap 23 is formed between the body halves 22A and 22B (only half body 22A being shown in Fig. 4). It should be pointed out that the support member 22 may be embodied as a single cylindrical body. A light-emitting optical fiber 24 and a light-receiving optical fiber 25 are inserted into the gap 23 of the support member 22. The optical fiber projecting light 24 and the optical fiber receiving light 25 are disposed in the member acting as supporf 22 in an arrangement te! that the end surface 24A of its light-emitting optical fiber 24 and the end surface 25A of the light-receiving optical fiber are arranged one above the other and also in an arrangement such as the end surfaces 24A and 24A. 25A are oriented towards the guide recesses 15A formed in the comb blades 15. Specifically, the light-emitting optical fiber 24 and the light-receiving optical fiber 25 are arranged such that their end surfaces 24A and 25A face the flight passage (that is to say the passage taken by the weft thread 16). In the first embodiment, the opfic light projection fiber 24 is generally disposed above the light receiving optical fiber 25.
    A light projection element and a light receiving element are mounted in a stationary portion (not shown) which remains static with respect to the oscillation movement of the rot 14. The optional light projection fiber 24 is connected to the element of projection of the light via an optical fiber made in the form of a plastic fiber. A light emitting diode (LED) is used to act as the light projection element. The light-receiving optical fiber 25 is connected to the light-receiving element via an optical fiber made in the form of a plastic fiber. A photodiode (PD) is used to act as the light receiving element.
    The light received by the end surface 25A of the light receiving optical fiber 25 is transmitted via the light receiving optical fiber 25 to the photodiode (not shown), and the photodiode then transmits to a controller (not shown) an electrical signal as a function of the intensity of the light received. In the controller, a determination is made as to whether a Y-frame wire is present or not based on the input of the electrical signal in the controller. The weft detectors 20, the plastic fibers, the light projecting element, the light receiving element and the controller together form the weft detection device.
    As shown in FIG. 4B, each of the fibers, namely the optical fiber projecting light 24 and its light-receiving optical fiber 25 represents a multimode optical fiber that is obtained by forming a beam with several elements 26 under the form of fibers. For ease of explanation, the optical fiber projecting light 24 and the light receiving optical fiber 25 are illustrated as a single optical fiber in Fig. 2 and Fig. 4A. In the following description, the optical fiber projecting light 24 and the optical fiber receiving light 25 will be represented as a single optical fiber as appropriate. In the first embodiment, the fiber-like elements 26 represent a multimode fiber SI constituted by glass fibers.
    As shown in FIG. 4B, the end surfaces 24A and 25A of the optical fiber projecting light 24 and the light receiving optical fiber 25 are made to provide a single flat surface, respectively.
    Each weft detector 20 is arranged in such a way that both the light projection area and the light receiving area of the weft detector 20 are arranged in a host of warp yarns when the loom is in an angular position at which the leading end of the inserted weft yarn Y reaches the detection zone of the weft detector 20.
    Specifically, as shown in FIGS. 3A and 3B, the angle formed by the end surface 25A of the light-receiving optical fiber 25 and the end surface 24A of the light-projecting optical fiber 24 is adjusted in such a way that that the upper limit of the projection area of the light A1 of the optical fiber projecting light 24 and the upper limit of the light receiving area A2 of the light-receiving optical fiber 25 coincide with each other. 'other. In the present embodiment, the end surface 24A of the optical fiber projecting light and the end surface 25A of the optic fiber receiving light are made to form an angle with respect to an imaginary plane H which is perpendicular to the axes of the optical fibers 24, 25 as shown in FIG. 4B. The angle formed between the plane H and each of the end surfaces 24A, 25A is adjusted for example to a value of approximately 10 °. The angle β formed by the axes of the optical fiber projecting light 24 and the optical fiber receiving light 25 extending from their ends and a tangential line L1 which is parallel to the rear surface of the blade comb 15 and also tangential to the lower jaw portion 15B of the comb blade 15 is set to a value of approximately 55 °.
    The operation of the weft detection device configured as described above will now be described.
    Light is projected from the optical fiber projecting light 24 from the weft detector 20 in the direction of the passage of weft yarn Ί 6 (the flight passage) through the end surface 24A of the optical fiber projecting light 24 and a part of the light which is reflected by the guide recess 15A or by a weft yarn Y is received by the end surface 25A of the optical fiber receiving light 25. The light received by the surface terminal 25A of the optical fiber receiving light 25 is transmitted via the optical fiber receiving light 25 to a photoelectric converter (not shown). The photoelectric converter generates an electrical signal that is based on the intensity of the received light and sends the electrical signal to a controller (not shown). The controller then makes a determination as to whether the weft detector 20 has detected the weft yarn Y or not based on the electrical signal. When no weft yarn Y is detected within a predetermined period of time following the start of the injection by the main nozzle 11, the controller determines a failure quanf at the insertion of frame wire and consequently stops the operation of the loom. When a Y-frame yarn is detected in the predetermined time period in question, the controller adjusts the timing of the injection and the duration of the injection based on the moment of detection at which the leading end of the yarn Y-weft is detected and on the angular position of the loom at the moment of detection of the Y-yarn.
    FIG. 5 shows the waveforms detected by the prior art weft detector and the weft detector 20 of the present embodiment. In FIG. 5, the solid line represents the signal detected by the weft detector 20 and the line formed by a two-dot chain represents the signal detected by the prior art weft detector. As shown in FIG. 5, the interval for the transmission of the reference signal SI of the loom corresponds to a rotation of the loom, that is to say 360 °. In the case of the prior art weft sensor, during the transmission interval or rotation of the loom, the detection signal is emitted when the angular position of the loom 96 ° or less and 250 ° or more. On the other hand, in the case of the weft detector 20 of the present embodiment, the detection signal is emitted when the angular position of the loom is 80 ° or less and 250 ° or more.
    Based on the comparison between the prior art weft sensor and the weft sensor 20 of the present embodiment, in the case of the prior art weft detector, as can be seen in the cross-sectional view of Fig. 8B, the light receiving area is adjacent to the portion 52C corresponding to the upper jaw of the comb blade 52 and on the opposite side to the rear surface of the comb blade 52 through the intersection between the portion 52C corresponding to the upper jaw of the comb blade 52 and the tangential line L! which is parallel to the rear surface of the comb blade 52 and which is also tangential to the portion 52B corresponding to the lower jaw of the comb blade 52. Furthermore, in the case of the weft detector 20, as as can be seen in the cross-sectional view of FIG. 3B, the light receiving area is not adjacent to the portion 15C corresponding to the upper jaw of the comb blade 15 and on the opposite side to the rear surface of the comb blade 15 through the intersection between the portion 15C corresponding to the upper jaw of the comb blade 15 and the tangential line L1 which is parallel to the rear surface of the comb zone 15 and which is also tangential to the portion 15B corresponding to the lower jaw of the comb blade 15.
    In addition, as can be seen in FIGS. 3A and 3B, the intersection between the portion 15C corresponding to the upper jaw and the tangential line L1 that is parallel to the rear surface of the comb blade 15 and which is also tangential. at the portion 15B corresponding to the lower jaw which is parallel to the rear surface of the comb blade 15 is adjacent to the portion 15C corresponding to the upper jaw and is also located between the position of the upper warp threads T (Tl) which form a host of warp yarns when the loom is in an angular position of 80 ° and the position of the upper warp yarns T (T2) which form a host of warp yarns when the loom is in a angular position of 96 °. Therefore, the angular position of the 80 ° loom corresponds to a limit at which the shedding upper chain wires T are not detected. In contrast, in the case of the prior art weft detector, the angular position of the 96 ° loom corresponds to a limit at which the shedding upper warp T yarns are not detected.
    To put it another way, with the prior art weft sensor, the position of the weft yarn can not be detected during the rotation of the loom since the start of the thread insertion. weft to the 96 ° angular position of the loom, since warp yarns are detected in this range of the angular position of the loom, i.e., the moment corresponding to the loom. arrival of the weft yarn Y can not be detected in said range. On the other hand, in the case of the weft detector 20, even if the moment corresponding to the arrival of the weft yarn can not be detected, as is the case for the prior art weft detector during the rotation of the loom from the start of inserting the weft yarn to the 80 ° angular position of the loom, the weft yarn can be detected during rotation of the loom at an angular position which is greater than 80 °. Therefore, in the case of the weft detector 20, the range in which the flying frame wire can be detected can be widened towards the main nozzle 11, when compared to the weft detector. of the prior art. The flight distance of the weft yarn during rotation of the loom from the angular position of 80 ° to the angular position of 96 ° is for example 16 cm in the case of the loom having a width of 2 m and 32 cm in the case of the loom with a width of 4 m. It should be noted that the distance may vary according to the conditions of commissioning of the loom.
    According to the present embodiment, the effects indicated below are obtained. (]} The weft yarn detection device is designed for use in a jet type loom in which a weft yarn Y is inserted by a jet of fluid and beaten or pushed by a comb 13 provided on a machine. The weft detection device includes at least one weft projecting and receiving weft detector, which is disposed across the width of a fabric so as to face the flight passage (the passageway). weft yarn 16) of the weft yarn Y, the upper warp yarns and the lower warp yarns being disposed outside the detection zone of the weft detector 20. Both the light production zone A1 and the light receiving zone A2 of the weft detector 20 are arranged in a host of warp yarns which are obtained when the loom is in an angular position at which the front end of the yarn Y frame arrives in the area detection of the weft detector 20.
    In accordance with the configuration in which the upper warp yarns and the lower warp yarns are arranged outside the detection zone and in which both the Al light projection area and the A2 light receiving area of the weft detector 20 are arranged in a host of warp yarns when the loom is in an angular position at which the leading end of the weft yarn inserted by the jet of fluid reaches the detection zone of the yarn. in the weft detector 20, no warp thread T is detected by the weft detector 20 when the weft detector 20 detects the weft yarn Y. Therefore, the range in which the weft yarn stealing can be detected by the weft detector 20 which moves to enter and exit the crowd of warp yarns is widened towards the main nozzle 11 of the machine. to weave. Further, even if no warp thread T is detected by the weft detector 20 as long as at least the light projection area A1 and the light receiving area A2 are located in the crowd of warp yarn, the weft yarn detector which both at the light projection area Al and the light receiving area A2 are located in the shed son of chains is easier to manufacture and reduces the number false detections. (2) At least one weft detector 20 is disposed at a location which is closer to the main nozzle 11 relative to the center of the width of the fabric. A fluid injected by the secondary nozzles 12, in addition to the fluid injected by the main nozzle 11, is also used for the flight of weft yarn Y. The provision of the weft detector 20 at a location which is closer of the main nozzle 11 relative to the center of the width of the fabric detects a weft insert insertion failure at an earlier time relative to the case in which the weft detector 20 is disposed closer the opposite side to the main nozzle 11 relative to the center of the width of the fabric, which saves the fluid injected by the secondary nozzles 12. (3) The use of optical fiber light projection 24 and the light-receiving optical fiber 25 consisting of multi-mode optical fibers obtained from the formation of a bundle containing a plurality of fiber-shaped elements 26 facilitates the increase of the accuracy of ction of the weft detector 20 with respect to the case in which each of the optical fibers, namely the optical fiber for projecting the light 24 and the optical fiber for receiving the light 25, is made in the form of a fiber unique optics.
    The present invention is not limited to the above-mentioned embodiment and can be modified as follows.
    In accordance with the present invention, the weft detector 20 may be configured such that, not both the light projection area A1 and the light receiving area A2, but at least one of said areas that is, the light projection area A1 and the light receiving area A2 is located in the shed of warp yarns at an angular position of the loom to which the leading end of the weft yarn Y reaches in the detection zone of the weft detector 20. For example, only the projection zone of the light Al can be arranged in the shed of warp yarns at an angular position of the loom to which the front end of the yarn weft Y arrives in the detection zone of the weft detector 20, or only the light detection zone A2 can be arranged in the shed of warp yarns at an angular position of the loom wherein the front end of the weft yarn Y reaches the detection zone of the weft yarn sensor 20.
    The projection area of the light A1 of the light-emitting optical fiber 24 and the light-receiving area A2 of the light-receiving optical fiber 25 need not necessarily cover the entire area at the back of the light-receiving optical fiber 25. intersection between its portion 15C corresponding to the upper jaw and the tangential line L1 which is parallel to the rear surface of the comb blade 15 and which is also tangential to the portion 15B corresponding to the lower jaw. For example, in the case where the area in which the light can not be received is disposed near the portion 15C corresponding to the upper jaw and rear of the intersection between the tangential line L1 and the corresponding portion 15C in the upper jaw, the configuration may be such that the controller makes a determination as to whether or not a yarn Y is present based on detection signals from the weft detector 20 in a state in which said area in which no light is received is disposed outside the crowd of warp yarns. Both the end surface 24A of the light-emitting optical fiber 24 and the end surface 25A of the light-receiving optical fiber 25 need not necessarily be made to form an angle with respect to the imaginary plane H which is perpendicular to the axes of the optical fibers 24, 25. For example, the configuration may be such that one or other of the end surfaces 24A, 25A is disposed parallel to the imaginary plane H which is perpendicular to the axes of the optical fibers 24, 25 the other end surface of the end surfaces 24A, 25A being made to form an angle with respect to the plane H.
    The end surface 24A of the light-emitting optical fiber 24 and the end surface 25A of the light-receiving optical fiber 25 need not be in the form of a single flat surface, respectively, several continuous planes capable of forming the end surfaces 24A, 25A.
    The end surface 24A of the light-emitting optical fiber 24 and the end surface 25A of its light-receiving optical fiber 25 need not be in the form of one or more flat surfaces, continuous curved surfaces, or combination of continuous curved surfaces and flat surfaces capable of forming the end surfaces 24A, 25A.
    The end surface 25A of the light-receiving optical fiber 25 may be disposed above the end surface 24A of the optical fiber projecting light 24.
    The end surface 24A of the optical fiber projecting light 24 and ία end surface 25A of the optical fiber receiving light 25 can be made to form different angles with respect to the imaginary plane H which is perpendicular to the axes of the optical fibers 24 , 25.
    The light-emitting optical fiber 24 and the light-receiving optical fiber 25 may be directly connected to the light-emitting diode or photodiode without using plastic fibers therebetween. It should be noted however that the use of plastic fibers and effective to prevent degradation of optical fibers caused by the heat due to the comb.
    The weft detector 20 may be configured in such a way that the light-projection element of the light-receiving element is provided at the pointed end of the support member 22 without using the optical fiber projecting from it. the light 24 and the optical fiber receiving the light 25.
    权利要求:
    Claims (3)
    [1]
    A jet-type weaving machine comprising a weft yarn detecting device in the jet-type weaving machine that injects a fluid jet to insert a weft yarn (Y) through a wire-shaped shed upper chain (T) and a lower warp wire (T) and which then uses a comb (13) which includes a comb blade (15) having a guide recess (1 SA) and which is provided on a rot ( 14) for pushing the weft yarn (Y) for weaving a fabric, the weft yarn detecting device comprising a weft sensor projecting and receiving light (20) disposed across the width of the weft fabric to face the flight passage (16) of the weft yarn (Y) formed by the guide recess (ISA), the weft detector (20) has a detection zone (Al, A2) having a light projection area (A1) and a light receiving area (A2); and when the loom is in an angular position in which the leading end of the weft yarn (Y) reaches the detection zone (A1, A2), the upper warp (T) and the warp yarn (T) are arranged outside the detection zone (A1, A2) and at least one of the light projection zone (A1) and the light receiving zone (A2) are arranged in the characterized in that the at least one zone selected from the light projection zone (A1) and the light receiving zone (A2) is not present adjacent to a portion (15C) corresponding to the upper jaw of the comb blade (15) and on a side opposite a rear surface of the comb blade (15) through an intersection between the portion (15C) corresponding to the upper jaw of the comb blade (15); ) and a tangential line (L1) which is parallel to the rear surface of the comb blade (15) and which is also tangent to a portion corresponding to the lower jaw of the comb blade (15).
    [2]
    2. Loom according to claim 1, characterized in that the weft sensor (20) is arranged closer to the main nozzle (11) of the loom with respect to the center of the width of the fabric.
    [3]
    Weaving machine according to claim 1 or 2, characterized in that both the projection area of the light (A1) and the light receiving area (A2) of the weft detector (20). are arranged in the crowd of warp son (T).
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    同族专利:
    公开号 | 公开日
    DE102015112674B4|2021-10-07|
    DE102015112674A1|2016-02-04|
    JP2016035124A|2016-03-17|
    CN105316859A|2016-02-10|
    JP6372229B2|2018-08-15|
    BE1023209A1|2016-12-21|
    CN105316859B|2017-04-12|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP2014-158742|2014-08-04|
    JP2014158742A|JP6372229B2|2014-08-04|2014-08-04|Weft detection device in jet loom|
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