• 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:
    de détection d'un fil de trame dans un métier à tisser du type à jet d'air englobe un membre de support faisant face à un passage de fil de trame pour un fil de trame, une fibre optique d'émission de la lumière et une fibre optique de réception de la lumière disposées dans le membre de support de manière telle que leurs surfaces terminales font face au passage de fil de trame. La surface terminale de la fibre optique d'émission de la lumière englobe une première région de surface et une deuxième prévision de surface qui est éloignée de la surface terminale de la fibre optique recevant à la lumière. La surface terminale de la fibre optique de réception de la lumière englobe une première région de surface et une deuxième région de surface qui est éloignée de la surface terminale de la fibre optique d'émission de la lumière. A sensor for detecting a weft thread of a device method of detecting a weft yarn in an air-jet type loom includes a support member facing a weft passage for a weft yarn, an optical fiber for light emission, and an optical fiber for receiving light disposed in the support member so that their end surfaces face the weft passage. The end surface of the light-emitting optical fiber includes a first surface region and a second surface area that is remote from the end surface of the optical fiber receiving light. The end surface of the light receiving optical fiber includes a first surface region and a second surface region that is remote from the end surface of the optical light emitting fiber.
    公开号:BE1022872B1
    申请号:E2015/5289
    申请日:2015-05-06
    公开日:2016-09-29
    发明作者:Ishikawa Hirohiko；Matsui Tadasumi；Seiki Kazuo
    申请人:Toyota Jidoshokki Kabushiki Kaisha；
    IPC主号:
    专利说明:

    DEVICE FOR DETECTING A FRAME WIRE IN A TRADE MACHINE
    AIR JET TYPE WORK
    BASIS OF THE INVENTION
    The present invention relates to a device for detecting a weft yarn in an air jet type loom and more particularly to a weft yarn detection device in a jet type loom. air in which a weft yarn is inserted by a jet of compressed air and is beaten by a comb provided on a leaf of the loom.
    The quality of a woven fabric depends to a large extent on the flight conditions of a weft yarn. In Japanese Unexamined Patent Publication Publication 2010-209478, a weft yarn detecting device having a light transmitting optical fiber and a light receiving optical fiber provided in a limb is disclosed. of support that moves to and from an open crowd formed by warp threads. Referring to Figure 10, there is shown the weft yarn detection device of the publication cited above. The support member 51 is disposed in an orientation such that its end end faces the weft passage 53 (not shown) which is formed by guide recesses 52A of a plurality of comb teeth 52. As shown in FIGS. 11A and 11B, the support member 51 is made by connecting a pair of body halves 51A and 51B to each other, and the light emitting optical fiber 54 and the optical receiving fiber the light 55 is provided in the support member 51 such that the ends of the respective light-emitting and light-receiving fibers 54 and 55 are exposed through an opening 51C formed at the end end of the support member 51 As can be seen in FIGS. 11A and 11B, each of the optical fibers 54 and 55 is made via a multimode optical fiber including a plurality of fiber elements in the form of a beam. The outer surface of the end portion 56 of the support member 51 and the end surface of the optical fibers 54 and 55 form a regular curved surface, so that the detection of a weft yarn in full flight is achieved without giving rise to a any degradation of the warp.
    The support member 51 is made to be thin enough to pass between rows of warp yarn. Therefore, the size (or diameter) of the light emitting optical fiber 54 and the light receiving optical fiber 55 which are mounted in the thin support member 51 is restricted by the size (or by the thickness) of the support member 51.
    Referring to Fig. 12A, the shaded area A1 in the drawing shows an area in the guide recess 52A formed by the teeth of the comb 52, which is defined between the base of the guide recess 52A and an imaginary line L1 extending parallel to the base and tangentially to the lower cheek portion for guiding recess 52A, showing an area capable of emitting light (or a detectable area). When the end surfaces of the light-emitting optical fiber 54 and the light-receiving optical fiber 55 terminate in a convex curve, as shown in FIG. 12A, areas incapable of emitting light are obtained. the light A3 in the guide recess 52A at the top and bottom of the guide recess 52A on the side of the guide recess 52A which is remote from its base, in the direction of which no light emitted by the optical fibers emitting light 54 (in other words, an area absent from light). Referring to Fig. 12A, the shaded area A2 represents a zone in the guide recess 52A formed by the teeth of the comb 52 which represents a light-receptive area or the area from which the optical fiber of light receiving 55 may receive light (that is, a detectable area). In the case of FIG. 12B, an area A4 is obtained below the zone capable of receiving light A2, from which no light can be received by the light receiving optical fiber 55. the area of overlap between the light-emitting area A1 and the light-receiving area A2 is reduced, so that the weft yarn detection performance is reduced in a type-to-type loom. air jet.
    The present invention which is based on the above mentioned problem relates to a weft yarn detecting device which provides improved performance in the detection of a weft yarn in flight.
    SUMMARY OF THE INVENTION
    To solve the problem mentioned above, there is provided an air jet type loom comprising a weft yarn detecting device in which a weft yarn is inserted by a jet of compressed air and is beaten by a comb provided on a wing of the loom. The weft yarn detecting device in the air jet type loom includes a support member which is arranged to face a weft passage for a weft yarn and an optical fiber. light emission and an optical fiber receiving light each having a terminal surface. The light-emitting optical fiber and the light-receiving optical fiber are arranged in the support member such that the end surfaces of the light-emitting optical fiber and the optical-receiving optical fiber. the light face the passage of weft thread. The end surface of the light-emitting optical fiber includes a first surface region that is adjacent to the end surface of the light-receiving optical fiber and a second surface region that is remote from the terminal surface of the light-receiving optical fiber. optical fiber for receiving light. The end surface of the light-receiving optical fiber includes a first surface region that is adjacent to the end surface of the light-emitting optical fiber and a second surface region that is remote from the terminal surface of the light-transmitting optical fiber. optical fiber of light emission. In both the light-emitting optical fiber and the light receiving optical fiber, the first and second surface regions form a plane. The angle formed by the first surface region of the end surface of one of the optical fibers among the light-emitting optical fiber and the light receiving optical fiber and the second surface region of the terminal surface of the other optical fiber among the light-emitting optical fiber and the light receiving optical fiber is set such that at least one of the limits of a detectable area of the optical transmission fiber of the light and at least one of the limits of a detectable area of the light receiving optical fiber coincide with the weft passage. The term "detectable area" refers in this case to an area in the weft passageway occupied by the light emitted by the light-emitting optical fiber and an area in the weft-fill passageway that is occupied. by the light that can be received by the optical fiber receiving light. The expression "the limit of the detectable area of the light-emitting optical fiber on the side of the light-emitting optical fiber and the limit of the detectable area of the light-receiving optical fiber on the side of the light-emitting optical fiber "in this case means an intersection between the upper limits of the light-emitting area, the light-receiving area, and a tangential line that is tangent to the light-emitting area. a lower cheek portion of the guide recess and also parallel to the base of the guide recess formed by the comb teeth. Further, the term "coincident with weft passing" means not only complete coincidence, but also coincidence with a negligible error that slightly affects the weft detection performance of the weft detection device. Other aspects and advantages of the invention will become apparent from the following description when 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 in which a weft insertion device is shown schematically in an air jet type loom; Fig. 2 is a partially cut away side view in which a positional relationship between a comb tooth and a weft sensor is schematically represented in the weft insertion device of Fig. 1; Fig. 3Α is a side view in which a portion of the weft sensor is schematically represented; Figure 3B is an enlarged view of that of Figure 3A; FIG. 4A is a schematic view of an index jump type optical fiber (SI); Fig. 4B is a schematic view showing an angle of incidence and a refraction angle in an optical fiber for receiving light; Fig. 5A is a schematic view showing the operation of an optical fiber; Figure 5B is a schematic view in which the operation of an optical fiber is shown; Figure 5C is a schematic view in which the operation of an optical fiber is shown; Fig. 6A is a schematic view in which the operation of the weft sensor is explained; Fig. 6B is a schematic view in which the operation of the weft sensor is explained; FIG. 7 is a partially cut away cross-sectional view in which a weft sensor is schematically represented in accordance with a second embodiment of the present invention; Fig. 8A is a side view in which a portion of the weft sensor is schematically represented in accordance with another embodiment of the present invention; Fig. 8B is a side view in which a portion of the weft sensor is schematically represented in accordance with yet another embodiment of the present invention; Fig. 8C is a side view in which a portion of the weft sensor is schematically represented in accordance with yet another embodiment of the present invention; Fig. 8D is a side view in which a portion of the weft sensor is schematically represented in accordance with yet another embodiment of the present invention; Fig. 9A is a side view in which a portion of the weft sensor is schematically represented in accordance with another embodiment of the present invention; Fig. 9B is a side view in which a portion of the weft sensor is schematically represented in accordance with yet another embodiment of the present invention; Fig. 10 is a cross-sectional side view showing the relationship between a weft yarn sensor and a comb in a weft yarn detection device in accordance with the prior art; Fig. 11A is a front view of a portion of the weft sensor in accordance with the prior art; Fig. 11B is a cross-sectional view taken along the line 11-11 of Fig. 11A; Fig. 12A is a schematic view in which the operation of the weft sensor according to the prior art is explained; Fig. 12B is a schematic view in which the operation of the weft sensor is also explained in accordance with the prior art.
    DETAILED DESCRIPTION OF THE EMBODIMENTS
    First embodiment
    A first embodiment of the present invention will now be described with reference to Figures 1 to 6.
    Referring to Figure 1, there is shown a weft insertion device in an air jet type loom which includes a leaf 14, a main nozzle 11 for inserting a wire of weft, several secondary nozzles 12 to assist the insertion of the weft yarn and a comb 13, which are all fixed on the leaf 14. The comb 13 is formed by a plurality of comb teeth 15 each having a guide recess 15A and arranged in the insertion direction of the weft yarn, such that we obtain a weft yarn passage 16 formed by the guide recesses 15A formed by the teeth of the comb 15, through which we fly a weft yarn. Each secondary nozzle 12 is removably mounted on the leaf 14 via a support block 17. The secondary nozzle 12 has the ability to move into and out of an open shed formed between the T-warp yarns.
    A plurality of weft yarn sensors 20 (a single weft yarn sensor 20 shown in FIG. 1), which detect a weft Y yarn flying in the weft yarn passage 16, are mounted on the yarn 14 via their yarns. corresponding support blocks 21 so that the position of the weft sensor 20 can be adjusted. The weft sensors 20 are able to move in and out of an open crowd of the warp yarns T in accordance with the swinging movement of the wing 14. A weft sensor 30 which detects the arrival of the the leading end of the inserted weft yarn Y at the end of the weft insertion range is mounted on the flapper 14 via a support block 31 so that the position of the weft sensor 30 can be adjusted.
    Hereinafter, we will describe the weft sensors 20.
    As shown in FIG. 2, each weft sensor 20 includes a rod-shaped support member 22 attached to the support block 21. The end of the support member 22 has the ability to move to enter and out of an open crowd formed between warp yarns T in accordance with the swinging movement of the wing 14. As was the case in the weft detection device of the publication cited above, the support member 22 encompasses a pair of body halves 22A and 22B which are connected to each other so as to form a space therein. It should be pointed out that the support member 22 may represent a single cylindrical body. The light-emitting optical fiber 24 and the light-receiving optical fiber 25 are inserted into the gap 23 of the support member 22. The optical light-emitting fiber 24 and the optical fiber receiving the light the lumen 25 are arranged in the support member 22 in such a manner that the end surface 24A of the light-emitting optical fiber 24 and the terminal surface 25A of the light receiving optical fiber 25 are arranged in a direction which is orthogonal to the insertion direction of the weft yam and is oriented towards the guide recesses 15A formed by the teeth of the comb 15. Specifically, the optical fiber of the transmission light 24 and light-receiving optical fiber 25 are arranged such that their end surfaces 24A and 25A face the weft passage. In the first embodiment, the light-emitting optical fiber 24 is disposed above the optical light receiving fiber 25.
    A light-emitting element and a light-receiving element are provided in a stationary part (not shown) which remains stationary regardless of the oscillating movement of the leaf 14. The light-emitting optical fiber 24 is connected to the element emitting light via an optical fiber made from a plastic fiber. A light emitting diode (LED) is used to act as a light emitting element. The light receiving optical fiber 25 is connected to the light receiving member via an optical fiber made from a plastic fiber. A photodiode (PD) is used to act as a light receiving element.
    The light received by the light-receiving optical fiber 25 at its end surface 25A reaches the photodiode (not shown) through the light-receiving optical fiber 25 and the photodiode then sends a controller (not shown) a signal which is proportional to the amount of light received. In the controller, a determination is made based on the input signal to the controller as to whether a weft yarn Y is present or not. The weft sensors 20 "plastic fibers" the light emitting element, the light receiving member and the controller form the weft detection device.
    As shown in Figure 3B. the light-emitting optical fiber 24 and the light-receiving optical fiber 25 are respectively made from bundles consisting of a plurality of elements 26 in the form of fibers. For ease of explanation, the light emitting optical fiber 24 and the light receiving optical fiber 25 are illustrated as a single optical fiber in Fig. 2 and Fig. 3A. The light emitting optical fiber 24 and the light receiving optical fiber 25 will be represented as a single optical fiber where appropriate. In the first embodiment, the fiber-shaped elements 26 consist of a multimode fiber type SI made from glass fibers. As shown in FIG. 4A, the multimode fiber SI has a central portion 41 which transmits light received from a light source. The refractive index is uniform throughout the central portion 41.
    As shown in FIG. 3B, the light emitting optical fiber 24 and the light receiving optical fiber 25 have flat end surfaces 24A and 25A. The end surface 24A of the light-emitting optical fiber 24 has a first surface region of 24B which is adjacent to the end surface of the light-receiving optical fiber 25 and a second surface region 24C which is realized away from the end surface 25A of the light receiving optical fiber (25). Similarly, the end surface 25A of the light receiving optical fiber 25 includes a first surface region 25B that is adjacent to the end surface 24A of the light emitting optical fiber 24 and a second surface region. 25C which is made at a distance from the end surface 24A of the light-emitting optical fiber 24. The angle which is formed by the first surface region of an optical fiber of the light-emitting optical fiber 24 and the light-receiving optical fiber 25 and the second surface region of the other optical fiber among the light-emitting optical fiber 24 and the light-receiving optical fiber 25 is adjusted in such a way that that at least one of the limits of a detectable area of the light emitting optical fiber 24 and at least one of the limits of a detectable area of the light receiving optical fiber 25 coincide with one another. e with each other. Specifically, in the first embodiment, the first surface region 24B and the second surface region 24C of the end surface 24A of the light-emitting optical fiber 24 are of flat shape and in a similar manner the first surface region 25B and the second surface region 25C of the end surface 25A of the light receiving optical fiber 25 are of flat shape. The angle that is formed by the end surface 25A of the light receiving optical fiber 25 and the end surface 24A of the light emitting optical fiber 24 is set in such a way that the boundary of the area detectable from the light-emitting optical fiber 24 on the side of the light-emitting optical fiber 24 and the limit of the detectable area of the light-receiving optical fiber 25 on the optical fiber side receiving light 25 coincide with each other. In the first embodiment, the end surfaces 24A and 25A are inclined with respect to an imaginary plane H which extends orthogonal to the axes of the light-emitting optical fiber 24 and the optical fiber of FIG. receiving light 25.
    The end surface 24A of the light emitting optical fiber 24 and the end surface 25A of the light receiving optical fiber 25 are exposed toward the weft passage 16 through an aperture 23A. The light passing through the light emitting optical fiber 24 is emitted from the end surface 24A to the weft passage 16 (the weft passage). The emitted light is reflected on the surface of the guide recess 15A formed by the teeth of the comb 15 and the reflected light enters the light-receiving optical fiber 25 through its end surface 25A.
    For the light that must be transmitted by the total reflection at the core-sheath interface, the refraction angle RI in the light-receiving optical fiber 25 must be 20 ° less, as shown in FIG. 4B. The critical angle for an air-glass interface is from about 41 ° to 43 °, and therefore an angle of incidence in that range or an angle greater than this range gives rise to total internal reflection. The angle that is formed between an incident light with respect to the light receiving optical fiber 25 and the end surface 25A and which allows the light to be received without giving rise to a total internal reflection varies depending on the types of fibers optical, refractive index and wavelength of light. According to an experiment carried out by the inventors of the present invention using the light receiving optical fiber 25, in order to maintain the refractive angle R1 at 20 ° or less to obtain a total transmission of the light reflected at the core-sheath interface, the angle of incidence 11 should be 30 ° or less, which means that the angle of light reception should be approximately 60 ° (or 30 °) each side).
    Referring to FIG. 5A, the end surface 24A of the light-emitting optical fiber and the end surface 25A of the light receiving optical fiber 25 extend orthogonal to the fiber axes. optical emission of the light 24 and the light-receiving optical fiber 25. In this case, the zone capable of emitting light, the light-emitting optical fiber 24 and the zone able to receive of the light, the light-receiving optical fiber 25 may not coincide with each other in that the end surface 24A of the light-emitting optical fiber 24 and the end surface 25A of the optical fiber receiving light 25 are not flat. When the end surface 25A of the light-receiving optical fiber 25 is inclined with respect to the axes of the optical fibers 24 and 25, as shown in FIG. 5B, the region capable of receiving light, the optical fiber of FIG. light reception 25 is correspondingly modified. When the flat end surface 24A is inclined with respect to the axes of the optical fibers 24 and 25, as shown in FIG. 5C, the zone capable of emitting light, the light-emitting optical fiber 24 is modified by corresponding way.
    Referring to Fig. 5B, there is shown a case in which the end surface 25A of the light receiving optical fiber 25 is inclined with respect to the end surface 24A of the light emitting optical fiber 24 which is arranged orthogonal to the axis of the optical fiber 24, the LHA indication represented by a dashed line denotes a boundary of the light-receptive zone, the optical fiber for receiving the light When the end surface 25A of the light receiving optical fiber 25 is orthogonal to the axes of the optical fibers 24 and 25, as is the case in FIG. 5A, the letter Θ which represents the an angle formed between the end surface 25A of the light receiving optical fiber 25 and an imaginary plane extending orthogonal to the axes of the optical fibers 24 and 25 designates a boundary of the light receiving region of the light receiving optical fiber 25 when the end surface 25A of the light receiving optical fiber 25 is inclined at an angle θ and a is the angle formed by LHA and LHB. When angle α and angle Θ are equal, the light emitting region and the light receiving region coincide with each other.
    In the weft yarn detecting device disclosed in the Unexamined Japanese Patent Application Publication 2010-209478, the end surfaces of the light emitting optical fiber 54 and the light receiving optical fiber 55 have a convex curvature, so that the warp yarns are not damaged by the support member 51 which moves to enter and exit from an open crowd of warp yarns. In the weft detection device disclosed in said publication, there is no mention of any way in which the area of overlap between the light transmissive region of the optical transmission fiber can be increased. the light 54 and the light receptive area of the light receiving optical fiber 55. In addition, since the end surfaces of the light emitting optical fiber 54 and the receiving optical fiber light 55 has a convex curve, the area of overlap between the light-emitting region A1 and the light-receiving area A2 is reduced, so that a reduction in the detection performance is obtained. weft thread.
    In the first embodiment, the light emitting optical fiber 24 and the light receiving optical fiber 25 are configured such that the end surface 24A of the light emitting optical fiber 24 includes the first and second surface region 24B and 24C and the terminal surface 25A of light receiving optical fiber 25a includes the first and second surface regions 25B and 25C, respectively, so that an increase of the overlap zone corresponding to the light-emitting region, the light-emitting optical fiber 24, and the light-receiving region of the light-receiving optical fiber. Referring to FIG. 6A, the line LU represents the upper limit or the limit of the detectable area of the light-emitting optical fiber 24 and L1 represents an imaginary line that extends in parallel at the base of the guide recess 15A and in tangential position with respect to the lower cheek portion for the guide recess 15A, and the letter C represents the point of intersection between the line LU and the line Li, and therefore represents the limit of the detectable area of the light-emitting optical fiber 24. In accordance with the present embodiment, the angle that is formed between the first surface region 25B of the terminal surface 25A of the light-receiving optical fiber 25 and the second surface 24C of the terminal surface 24A of the light-emitting optical fiber 24 is set such that the limit C above of the detectable area of the optical fiber emission of the light 24 from the far side of the light receiving optical fiber 25 and the limit of the detectable area of the optical fiber receiving the line at 25 adjacent to the light transmitting optical fiber the light 24 coincide with each other.
    In the weft detection device according to the present embodiment in which the first surface region 24B and the second surface region 24C of the end surface 24A of the light-emitting optical fiber 24 are of shape flat, and wherein the first surface region 25B and the second surface region 25C of the end surface 25A of the light-receiving optical fiber 25 are also of flat shape, the angle formed by the terminal surface 24A corresponds to the angles formed by the first and second surface regions 24B and 24C, and the angle formed by the terminal surface 25A corresponds to the angles formed by the first and second surface regions 25B and 25C, respectively. Accordingly, the aforesaid angle Θ formed by the end surface 24A of the light-emitting optical fiber 24 and the end surface 25A of the light-receiving optical fiber 25 is set so that the the detectable area of the light emitting optical fiber 24 on the side of the light emitting optical fiber 24 and the limit of the detectable area of the light receiving optical fiber 25 on the fiber side optical light emitting 24 coincide with each other.
    A pacing test was performed on the weft detection device in accordance with the publication of Unexamined Japanese Patent Application 2010-209478 and on the weft detection device according to the first embodiment of the present invention. the present invention with regard to the area of overlap between the area capable of emitting light and the region adapted to receive light. The overlap area was determined from an area capable of emitting light A1 and a light receiving area A2 into the guide wire recess 15A of the wire 15, which are indicated by shaded areas in Figures 6A and 6B, respectively. In the stimulation test, a light-emitting optical fiber and a light-receiving optical fiber are used, the end surfaces of which form an inclination angle Θ of about 10 ° with respect to the orthogonal plane with respect to the axes of the fibers. optics. As a result, the angle β formed by the axes of the light-emitting optical fiber 24 and the light receiving optical fiber 25 and at a vertical line extending parallel to line L1 (as shown in FIG. 6A).
    The light-emitting region A1 of the light-emitting optical fiber 24 according to the first embodiment is indicated by a shaded area in FIG. 6A and the light-receptive area 25 is indicated by a shaded area in Figure 6B, respectively. The light-emitting region A1 of the light-emitting optical fiber 54 in accordance with the prior art is indicated by the shaded area in FIG. 12A and the area capable of receiving light A2 from the receiving optical fiber. light 55 is indicated by a shaded area in FIG. 12, respectively.
    According to the first embodiment, the effects indicated below are obtained. (1) The weft sensor 20 is a weft yarn detecting device which is designed for use in an air jet type loom in which a Y weft yarn is inserted by a jet of dye. compressed air and is beaten by the comb 13 provided on the wing 14 of the loom. The weft sensor 20 includes a support member 22 disposed opposite the weft passage (the weft thread passage 16), the optical light transmitting fiber 24 and the optical receiving fiber. the light 25 which are arranged in the support member 22 so that their end surfaces 24A and 25A are oriented in the direction of the weft passage. The end surface 24A of the light-emitting optical fiber 24 has a first surface region 24B which is adjacent to the end surface 25A of the light-receiving optical fiber 25 and a second surface region 24C which is formed away from the end surface 25A of the light receiving optical fiber 25. The end surface 25A of the light receiving optical fiber 25 has a first surface region 25B which is adjacent to the end surface 24A of the fiber light emitting optics 24 and a second surface region 25C which is formed away from the end surface 24A of the light emitting optical fiber 24. The first surface region 25B and the second surface region 25C are of flat shape. The angle formed by the first surface region of one fiber of the light emitting optical fiber 24 and the light receiving optical fiber 25 and the second surface region of the other fiber of the fiber light-emitting optics 24 and the light receiving optical fiber 25 is set such that at least one of the limits of the detectable area of the optical light-emitting fiber 24 and at least one of the The limits of the detectable area of the light receiving optical fiber 25 coincide with each other. Therefore, the area of overlap between the detectable areas of the light-emitting optical fiber 24 and the light-receiving optical fiber 25 is increased, so that the detectable areas coincide with each other. other in the upper part of the weft passage 16 when the weft yarn is most likely to borrow, the result is that we increase the performance of the detection of the weft yarn. (2) The support member 22 is movable into and out of an open shed of the T-warp yarns. The light-emitting optical fiber 24 and the light receiving optical fiber 25 are arranged so such that the end surface 24A of the light emitting optical fiber 24 and the end surface 25A of the light receiving optical fiber 25 are disposed in a direction which is orthogonal to the insertion direction of the wire and in the direction of the guiding recess 15A formed by the teeth of the comb 15. In accordance with this arrangement in which the light receiving optical fiber 25 receives the light emitted by the optical fiber of emission of the light 24 and which is reflected by the guide recess 15A, the detection accuracy of the weft sensor 20 is greater than that of the configuration in which the weft yarn is detected by the light reflected by the weft yarn. In addition, the support member 22 can be made with a thickness less than that in force in the arrangement in which the light-emitting optical fiber and the light-receiving optical fiber sontα are arranged laterally one to next to each other. (3) The end surface 24A of the light-emitting optical fiber and the end surface 25A of the light-receiving optical fiber 25 are both inclined with respect to the plane extending orthogonally with respect to fiber axes 24 and 25. According to this configuration, the angle formed by the end surfaces 24A and 25A of the light-emitting optical fibers and their corresponding light receiving optical fibers 24 and 25 and the plane which extends in an orthogonal direction with respect to the axes of the optical fibers 24 and 25 may be smaller than that in force with the configuration in which the end surface of one or the other of the fibers of the optical fiber of emission of the light and the light receiving optical fiber is inclined with respect to the axes of the optical fibers. (4) In the light emitting optical fiber 24, the end surface 24A is a plane obtained by including the first surface region 24B and the second surface region 24C which are flat in shape and which are inclined at an angle to the axis of the light-emitting optical fiber 24. Similarly, in the light-receiving optical fiber 25, the terminal surface 25A represents a plane which is obtained including the first surface region 25B and the second surface region 25C which are flat in shape and which are inclined at an angle to the axis of the light receiving optical fiber 25. Therefore, the formation and the finishing of the end surface 24A of the light-emitting optical fiber and the end surface 25A of the light receiving optical fiber 25 can be facilitated with respect to the configuration in which Surface regions such as regions 24B and 25B and second surface regions such as regions 24C and 25C are formed by a plurality of surfaces each forming a different angle with respect to the axes of optical fibers 24 and 25. (5) Each of optical fibers among the light-emitting optical fiber 24 and the light-receiving optical fiber 25 is formed by a multimodal optical fiber including a plurality of fiber elements 26 in the form of a beam. Such an arrangement regarding the light emitting optical fiber 24 and the light receiving optical fiber 25 is advantageous in terms of the detection sensitivity of the weft sensor with respect to the configuration in which each of the optical fibers among the light-emitting optical fiber 24 and the light-receiving optical fiber 25 is formed by a single optical fiber.
    Second embodiment
    A second embodiment of the present invention will now be described with reference to Figs. 1-7. The weft detection device according to the second embodiment differs from that of the first embodiment in that detection of the weft yarn of the second embodiment is configured to detect, not a weft yarn which is flying in the weft passage 16 constituting the weft passage, but to detect whether or not the end of a weft yarn has arrived at a location which is disposed adjacent to the waste edge of a fabric being woven on the looms, i.e. the end end of the weft insertion passage. The same elements as those referred to in the first embodiment are designated by the same reference numerals and their detailed description will therefore be omitted.
    As shown in FIG. 1, the weft sensor 30 of the weft yarn detection device according to the second embodiment is adjustably mounted on the leaf 14 at a weft arrival point of the weft yarn. outside the crowd of the warp threads T via the support block 31.
    Referring to FIG. 7, the weft sensor 30 includes the light emitting optical fiber 24 and the light receiving optical fiber 25 which are supported by a support member 32 in such a manner that the end surface 24A of the light-emitting optical fiber and the end surface 25A of the light receiving optical fiber 25 are arranged in a side-by-side relationship in that order in the direction of insertion of the light-emitting optical fiber. The weft sensor 30 is oriented towards the teeth formed by the comb 15 and in the direction of the weft passage. Each of the optical fibers of the light-emitting optical fiber 24, the light receiving optical fiber 25 is made using a multimodal optical fiber including a plurality of fiber elements 26 (not shown in FIG. 7) in the form of a beam.
    Specifically, the light-emitting optical fiber 24 is disposed upstream of the light-receiving optical fiber 25 with respect to the direction of flight of the weft yarn Y. The end surface 24A of the optical fiber of FIG. light emission and the end surface 25A of the light receiving optical fiber 25 are inclined with respect to an imaginary plane H which extends in orthogonal position with respect to the axes of the optical fiber of emission of the light 24 and the light receiving optical fiber 25. The inclination angles of the end surfaces 24 and 25 are determined such that the area of overlap between the zone capable of emitting light of the fiber is increased. optical light emitting light 24 and the region adapted to receive light from the light receiving optical fiber 25. The light emitted by the light emitting optical fiber 24 is reflected by the light wire. Y array and the reflected light enters the light receiving optical fiber 25 via the terminal surface 25A.
    The light axes of the light emitting optical fiber 24 and the light receiving optical fiber 25 are substantially orthogonal to the insertion direction of the weft yarn. Referring to FIG. 7, the point C which represents the point of intersection between a line L2 which extends parallel to the base of the guide recess 15A (as can be seen in FIG. 6) of the formed teeth by the comb 15 and one of the boundaries defining the light-emitting region of the light-emitting optical fiber 24 which is disposed remote from the light-receiving optical fiber 25 and a dot representing the point of intersection between the line L2 and one of the boundaries defining the light receptive zone of the light receiving optical fiber 25 on the side of the light emitting optical fiber 24 coincide with one another. with the other. In addition, a point which represents the point of intersection between the line L2 and one of the limits defining the light-emitting region of the light-emitting optical fiber 24 on the side of the optical fiber receiving the light. light and a point which represents the point of intersection between the line L2 and one of the boundaries defining the light-receptive area of the light-receiving optical fiber 25 which is arranged at a distance from the optical fiber of emission of light 24 coincide with each other. Referring again to FIG. 7, the shaded area that is defined by line 2, by the base of the guide recess 15A of the teeth formed by the comb 15, by the extension of one of the boundaries defining the area capable of emitting light from the light-emitting optical fiber 24 which is arranged at a distance from the light-receiving optical fiber 25 and by the extension of one of the limits defining the light-receiving zone of the light-receiving optical fiber 25, which is disposed remote from the light-emitting optical fiber 25, represents a detectable area A of the light-emitting optical fiber 24 and the light-receiving optical fiber. the light 25. Specifically. in the weft sensor 30 according to the second embodiment, wherein the configuration of the end surface 24A of the light-emitting optical fiber and the end surface 25A of the light receiving optical fiber 25 of the weft sensor 30 is the same as that in force in the first embodiment, the limits of the detectable areas coincide at points C and D.
    According to the second embodiment, the effects indicated below are obtained, in addition to effects similar to the effects described in (3), (4) and (5) in the first embodiment. (6) The support member 32 is disposed at the weft arrival point outside the shed of the warp yarns T, and the light emitting optical fiber 24 and the optical fiber of Light receiving 25 is provided in the support member 32 in such a manner that the end surfaces 24A and 25A are arranged in a side-by-side relationship in that order in the direction of insertion of the weft yarn. With respect to a conventional weft yarn detection device which uses a lens to detect the end of a weft yarn inserted at the end end of the weft insertion passage, the width of the yarn sensor Weft 30 as measured in a direction parallel to the insertion direction of the weft thread can be reduced. Specifically, in comparison with the conventional weft yarn detection device in which each of the light-emitting and receiving-light portions uses a lens having a width dimension that is greater than 10 mm, the width of the Weft sensor 30 can be significantly reduced, for example up to 5 mm or less by using the light emitting optical fiber 24 and the light receiving optical fiber 25 which each have a diameter of 2. mm or less. As a result, the length of the weft yarn passage used for insertion of the weft yarn can be reduced.
    The present invention is not limited to the embodiments which have been described above; it can be implemented in various ways as shown below as an example.
    Neither the end surface 24A of the light-emitting optical fiber nor the end surface 25A of the light receiving optical fiber 25 need not be inclined relative to the plane which extends orthogonal to the to the axes of the optical fibers 24 and 25. For example, in the configuration in which the light-emitting optical fiber 24 and the light-receiving optical fiber 25 are arranged such that their end surfaces 24A and 25A are arranged in a direction that is orthogonal to the weft insertion direction, the end surface 24A may be disposed parallel to a plane which extends orthogonal to the axes of the optical fibers 24 and 25, while that the end surface 25A can be inclined relative to the same plane, as shown in Figure 8A.
    As shown in FIG. 8B, in the configuration in which the light emitting optical fiber 24 and the light receiving optical fiber 25 are arranged such that their end surfaces 24A and 25A are arranged in one direction. which is orthogonal to the insertion direction of the weft yarn, the end surface 24A may be inclined relative to the plane which extends orthogonal to the axes of the optical fibers 24 and 25 and the end surface 25A may be arranged parallel to the same plane.
    As shown in FIG. 8C, in the configuration in which the light-emitting optical fiber 24 and the light receiving optical fiber 25 are arranged such that their end surfaces 24A and 25A are arranged in one direction which is orthogonal to the insertion direction of the weft yarn, the end surface 24A may be disposed in parallel with the plane which extends orthogonal to the axes of the optical fibers 24 and 25, while the first region 25B of the end surface 25A surface may be disposed in parallel to the plane which extends orthogonal to the axes of the optical fibers 24 and 25 and the second surface region 25C may be inclined relative to the same plane.
    As shown in FIG. 8D, in the configuration in which the light-emitting optical fiber 24 and the light receiving optical fiber 25 are arranged in a direction that is orthogonal to the direction of insertion of the light. weft yarn, in the same configuration as that indicated above, Ια terminal surface 24A can be arranged in parallel with the plane which extends in orthogonal position with respect to the axes of the optical fibers 24 and 25, and the first surface region 24B of the end surface 24A may be disposed in parallel to the plane extending orthogonal to the axes of the optical fibers 24 and -25 and the second surface region 24C may be inclined relative to the same plane.
    As shown in FIG. 9A, in the configuration in which the light emitting optical fiber 24 and the light receiving fiber 25 are arranged such that their end surfaces 24A and 25A are arranged in a lateral position in a reciprocal side-by-side relationship along the insertion direction of the weft yarn, the end surface 24A may be inclined relative to the plane which extends orthogonal to the axes of the optical fibers 24 and 25, while that the terminal surface 25A can be arranged in parallel in the same plane.
    As shown in FIG. 9B, in the configuration in which the light emitting optical fiber 24 and the light receiving fiber 25 are arranged such that their end surfaces 24A and 25A are arranged in a lateral position in a reciprocal side-by-side relationship along the insertion direction of the weft yarn, the end surface 24A may be disposed in parallel with the plane which extends orthogonal to the axes of the optical fibers 24 and 25, while that the end surface 25A can be inclined relative to the same plane.
    In the configuration in which the light-emitting optical fiber 24 and the light-receiving fiber 25 are arranged such that their end surfaces 24A and 25A are arranged in a lateral position in a reciprocal side-by-side relationship. along the direction of insertion of the weft yarn and in which the end surface 24A (or the end surface 25A) is inclined relative to the plane which extends orthogonal to the axes of the optical fibers 24 and 25, only the second surface region 24C (or the second surface region 25C) may be inclined with respect to the same plane.
    In the configuration in which the light-emitting optical fiber 24 and the light receiving optical fiber 25 are arranged such that their end surfaces 24A and 25A are arranged in a direction which is orthogonal to the direction insertion of the weft yarn, the arrangement may be such that the end surface 25A is located above the end surface 24A.
    In the configuration in which the light-emitting optical fiber 24 and the light-receiving optical fiber 25 are arranged such that their end surfaces 24A and 25A are arranged in a lateral position in a reciprocal side-by-side relationship along the insertion direction of the weft yarn, the arrangement may be such that the end surface 24A is disposed downstream of the end surface 25A with respect to the insertion direction of the weft yarn.
    In the configuration in which the light-emitting optical fiber 24 and the light receiving optical fiber 25 are arranged so that the first surface region 24B and the second surface region 24C are formed to form an angle therebetween and / or such that the first surface region 25B and the second surface region 25C are formed to form an angle therebetween, a third surface region may be provided between the first surface region 24B and the second surface region 24C and / or between the first surface region 25B and the second surface region 25C, which is formed to form an angle with respect to the first surface region 24B and the second surface region 24C and / or with respect to the first surface region 25B and the second surface region 25C.
    In the configuration in which the light-emitting optical fiber 24 and the light-receiving optical fiber 25 are inclined with respect to the plane which extends in orthogonal position with respect to the axes of the optical fibers 24 and 25, the End surfaces 24A and 25A may be inclined at different angles. The angle θ formed by the first surface region 25B of the light-receiving optical fiber 25 and the second surface region 24B of the light-emitting optical fiber 24 can also be adjusted so that the limit of the detectable area of the light emitting optical fiber 24 on the light receiving optical fiber side 25 and the limit of the detectable area of the light receiving optical fiber 25 on the fiber side light receiving optics 25 coincide with each other, in addition to the coincidence of the light-emitting optical fiber side 24. In this case, as shown in FIGS. 6A and 6B, the limit of the detectable area of the light-emitting optical fiber 24 and the limit of the detectable area of the light receiving optical fiber 25 coincide with each other at the meeting point D of the line lower LS which defines the light emission range and the tangential line 1 which is parallel to the base of the guide recess 15A of the corresponding teeth forming the comb 15.
    The light-emitting optical fiber 25 and the light-receiving optical fiber 25 may be directly connected to the LED or PD without having to use plastic fibers together. However, it should be pointed out that the use of plastic fibers is effective in preventing the degradation of optical fibers caused by the flapping of the comb.
    权利要求:
    Claims (4)
    [1]
    An air jet loom comprising a weft yarn detecting device (20, 30) in which a weft yarn (Y) is inserted by a jet of compressed air and is beaten by a comb (13) provided on a leaf (14) of the loom, the apparatus comprising: a support member (22, 32) arranged to face a weft passage (16) for the yarn frame (Y); and an optical light-emitting fiber (24) and a light-receiving optical fiber (25) each having an end surface (24A, 25A), the light-emitting optical fiber (24) and the optical fiber (25) being arranged in the support member (22, 32) so that their end surfaces (24A, 25A) face the weft passage (16), characterized in that the terminal surface (24A) of the light-emitting optical fiber (24) includes a first surface region (24B) which is adjacent to the end surface (25A) of the light receiving optical fiber (25); ) and a second surface region (24C) which is remote from the end surface (25A) of the light receiving optical fiber (25), and the end surface (25A) of the light receiving optical fiber ( 25) includes a first surface region (25B) which is adjacent to the terminal surface (2) 4A) of the light-emitting optical fiber (24) and a second surface region (25C) which is remote from the end surface (24A) of the light-emitting optical fiber (24), the first surface region (24B, 25B) and the second surface region (24C, 25C) in respectively the light-emitting optical fiber (24) and the light-receiving optical fiber (25) being of flat shape; and the angle formed by the first surface region (24B, 25B) of an optical fiber of the light-emitting optical fiber (24) and the light receiving optical fiber (25) and the second the surface region (24C, 25C) of the other optical fiber among the light-emitting optical fiber (24) and the light receiving optical fiber (25) is set such that at least one of the limits of a detectable area (A1) of the light-emitting optical fiber (24) and at least one of the limits of a detectable area (A2) of the light receiving optical fiber (25) coincide with the passage of weft thread (16).
    [2]
    An air jet type weaving machine comprising a weft yarn detecting device (20) according to claim 1, characterized in that: the support member (22) is capable of moving to enter and emerging from an open crowd formed between warp threads (T); the light-emitting optical fiber (24) and the light-receiving optical fiber (25) are arranged in such a way that the end surface (24A) of the light-emitting optical fiber (24) and the end surface (25A) of the light receiving optical fiber (25) is arranged in a direction which is orthogonal to the insertion direction of the weft yarn and which is oriented towards a guide recess (15A) formed by the teeth of the comb (15).
    [3]
    An air jet loom comprising a weft yarn detecting device (30) according to claim 1, characterized in that: the support member (22) is disposed at the location of arrival of the weft thread outside the crowd of warp threads (T); and the end surface (24A) of the light-emitting optical fiber (24) and the end surface (25A) of the light-receiving optical fiber (25) are arranged in a side-by-side relationship in this order in the insertion direction of the weft thread.
    [4]
    Air jet type weaving machine comprising a weft yarn detection device (20, 30) according to any one of claims 1 to 3, characterized in that: the end surface (24A) of the light-emitting optical fiber (24) and the terminal surface (25A) of the light receiving optical fiber (25) are inclined with respect to a plane (H) which extends orthogonal to the axes of the optical fibers (24, 25).
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    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP2014-099848|2014-05-13|
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