• 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 detector for a jet loom includes a support member (20) and an optical fiber (22, 23, 22B, 23B, 22C, 23D). The supporting member (20) is able to penetrate a shed which is formed between rows of warp threads, between warp threads (T). The optical fiber (22, 23, 22B, 23B, 22C, 23D) arranged in the supporting member (20) faces a passage (142) for the theft of the weft yarn (Y). A first curved surface (241), which represents an outer surface of a distal portion (24) of the limb (20) serving as a support, is progressively connected to a second curved surface (221, 231, 221A, 231A) which is formed by at least one peripheral portion in the distal surface of the optical fiber (22, 23, 22B, 23B, 22C, 23D).
    公开号:BE1019208A3
    申请号:E2010/0133
    申请日:2010-03-03
    公开日:2012-04-03
    发明作者:
    申请人:Toyota Jidoshokki Kk；
    IPC主号:
    专利说明:

    FRAME DETECTOR FOR A JET WEAVING FOUNDATION OF THE INVENTION
    The present invention relates to a weft detector for a jet loom which ejects fluid to propel a weft yarn and which beats the weft yarn with a comb of the leaf on a divider comb.
    Japanese Patent Laid-Open Publication No. 5-71046 discloses a weft sensor including a light projection optical fiber for monitoring the flight status of a weft yarn that strongly affects the quality of a fabric. The light-projection optical fiber and the light receiving optical fiber are arranged in a support member which moves through warp yarns which are arranged in a row, as it enters the shed and its out of the latter. When the distal portion of the weft thread enters the projection area of the light projection optical fiber, the light projected from the distal surface (light projection surface) of the light projection optical fiber is reflected by the distal portion of the weft yarn and is received by the distal surface (light receiving surface) of the light receiving optical fiber.
    The distal surface of the light-projection optical fiber and the distal surface of the light-receiving optical fiber, which are exposed with respect to the distal end of the support member, are flat.
    The distal portion of the support member has a convex curved surface outwardly so as not to damage the warp threads as it passes therethrough. Thus, the distal portion of each optical fiber having a flat distal surface projects outwardly with respect to the curved surface in the distal portion of the support member. Said portion of the protruding optical fiber forms a protruding edge which is capable of damaging the warp yarns as the support member moves between the warp yarns.
    SUMMARY OF THE INVENTION
    An object of the present invention is to prevent degradation of the warp yarns by a support member including an optical fiber, when the support member moves through the warp yarns as it enters the shed and his exit from the latter.
    One aspect of the present invention relates to a weft detector for a jet loom including a flapper comb for beating a weft yarn which has been propelled by a fluid ejected into the shed formed between the rows of warp yarns. The weft detector includes a support member capable of entering the shed passing between warp yarns of one of the rows of warp yarns. The support member includes a distal portion having an opening. An optical fiber is arranged in the support member and faces a passage for weft flight formed in the flapper comb. The optical fiber includes at least either a light projection optical fiber or an optical light receiving fiber. The optical fiber has a distal surface exposed with respect to the aperture. The distal portion of the support member has an outer surface formed by a first curved surface curved outwardly. At least one peripheral portion in the distal surface of the exposed optical fiber with respect to the aperture is formed by a second outwardly curved curved surface. The second curved surface is progressively connected to the first curved surface.
    Other aspects and advantages of the present 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
    The invention, together with its objects and advantages, can best be understood by reference to the following description of the presently preferred embodiments, together with the accompanying drawings in which:
    Fig. 1 is a perspective view showing a jet loom including a weft detector according to a first embodiment of the present invention; Fig. 2A is a cross-sectional side view showing a support member of Fig. 1; Fig. 2B is a cross-sectional side view showing a secondary nozzle which propels a weft yarn, of FIG. 1; FIG. 3A is a dorsal view showing the support member of FIG. ; Fig. 3B is a cross-sectional view taken along line 3B-3B in Fig. 3A; Figure 4A is a partial cross-sectional view showing the jet loom of Figure 1; Fig. 4B is a partial dorsal view showing the support member of Fig. 1; Fig. 4C is a partial side view showing the support member of Fig. 1; Fig. 5 is an enlarged partial cross-sectional view showing a support member according to a second embodiment of the present invention; Fig. 6A is an enlarged partial cross sectional view showing a support member according to another embodiment of the present invention; Fig. 6B is a partial dorsal view showing the support member of Fig. 6Δ; Fig. 7A is an enlarged partial cross-sectional view showing a support member according to another embodiment of the present invention; Fig. 7B is a partial dorsal view showing the support member, Fig. 7A; Fig. 8 is an enlarged partial cross-sectional view showing a support member according to yet another embodiment of the present invention; Fig. 9A is an enlarged partial cross-sectional view showing a support member according to yet another embodiment of the present invention; and Fig. 9B is a partial dorsal view showing the support member of Fig. 9A.
    DETAILED DESCRIPTION OF THE EMBODIMENTS
    PREFERRED
    A first embodiment of the present invention will now be indicated with reference to Figures 1 to 4.
    Referring to FIG. 1, a divider comb 11 has a main weft propellant nozzle 12 that ejects air (fluid) to propel a weft yarn through a shed formed between warp yarns. T. A plurality of weft yarn propelling secondary nozzles 13 are disposed in alignment along a mounting surface 111 which is defined by a front surface of the divider comb 11. The auxiliary nozzles 13 eject air (fluid) in order to relay the weft yarn Y, which has been propelled into the crowd of the warp yarns T. As a result, the weft yarn Y flies through a passage 142 which is intended for it, extending between the flapper combs The ejection of air from the ejection holes 131 of the auxiliary nozzles 13 (referring to FIG. 4A) is controlled by opening and closing electromagnetic valves (which are not not represented). After having propelled a predetermined length of the weft yarn Y, the combs 141 of the leaf 14 which oscillates integrally with the dividing comb 11, beat the weft yarn Y to obtain a cut W1 of a woven fabric W.
    As shown in FIGS. 2A and 2B, a support groove 16 extends through the mounting surface 111 in the longitudinal direction of the divider comb 11. The support groove 16 includes a narrow portion 161 which opens on the mounting surface 111, a wide portion 162 which is communicated with the narrow portion 161, and a shoulder 163 which is formed by the difference in width between the narrow portion 161 and the wide portion 162. The shoulder 163 is extends parallel to the mounting surface 111.
    Referring to FIG. 2A, a plurality of support blocks 17 are coupled to the mounting surface 111. Each support block 17 receives two bolts 18. Each bolt 18 has a threaded portion 181 which includes a distal portion projecting from it. Outside the support block 17. A locking nut 19 is attached to the projecting portion of the bolt 18. The bolt 18 has a hexagonal head 182 which is housed in the wide portion 162. The corners of the head 182 abut against the The tightening of the locking nut 19 forces the head 182 against the shoulder 163 and secures the support block 17 to the divider comb. The coupling position of the support globe 17 may be varied in the longitudinal direction of the divider comb 11 (the weft yarn propelling direction indicated by the arrow P in FIG. 1).
    Referring to FIG. 2B, the support blocks 15, which support the auxiliary nozzles 13, are coupled to the divider comb 11 by a means which is identical to the means for coupling the support blocks 17 to the divider comb 11, more precisely the bolts 18 and the lock nuts 19.
    A rod-like support member 20 is attached to each support block 17. The support member 20 has a distal portion 24 which moves between T-warp threads as it enters the shed of the wires. T chain and its output from said crowd, when the divider comb 11 oscillates.
    FIG. 3A shows the support member 20 which is formed by joining two segments 25 and 26.
    As shown in FIG. 3B, a retaining cavity 21 is formed in the support member 20. A first optical fiber 22, which projects light and a second optical fiber 23 which receives light, are retained in the retaining cavity 21. The first optical fiber 22 includes a plurality of first elements in the form of fibers 220, gathered in a bundle . The second optical fiber 23 includes several elements in the form of fibers 230, gathered in a bundle. In the present embodiment, the first and second fiber-shaped members 220 and 230 are glass fibers.
    The first optical fiber 22 has a distal surface 221, which is exposed relative to an opening 211 of the retaining cavity 21 (when referring to Figure 3A). The second optical fiber 23 has a distal surface 231 which is exposed relative to an opening 212 of the retaining cavity 21 (when referring to Figure 3A). The light passing through the first optical fiber 22 is projected from the distal surface 221 towards the passage 142.
    As can be seen in FIG. 4A, the first optical fiber 22 forms an X-light projection zone in the passage 142. In addition, the distal surface 231 of the second optical fiber 23 is arranged to face the projection zone. of light X which is part of the passage 142. When the distal portion of the weft yarn Y which is propelled through the passage 142 reaches the light projection zone X, the light projected by the first optical fiber 22 strikes the distal portion weft yarn Y which reflects light. The light reflected by the distal portion of the weft yarn Y is received by the distal surface 231 of the second optical fiber 23.
    The second optical fiber 23 sends the light, which has been received by the distal surface 231 towards a photoelectric converter (not shown). Depending on the amount of light received, the photoelectric converter generates an electrical signal that is sent to a control unit (not shown). The control unit uses the electrical signal to determine the moment corresponding to the arrival of the distal end of the weft yarn Y in the light projection zone X. The information concerning the moment corresponding to the arrival of the The distal end of the weft yarn Y which is recognized in this way is used to control for example the moment corresponding to the ejection and the time corresponding to the ejection of the auxiliary nozzles 13 for the subsequent propulsion of the weft yarn.
    As shown in FIGS. 3A and 3B, the distal portion 24 of the support member 20 has an outer surface formed by an outwardly curved progressive curved surface (hereinafter referred to as "first curved surface 241 "). The distal surface 221 of the first optical fiber 22 exposed with respect to the aperture 211 forms a curved, outwardly curved surface (hereinafter referred to as "the second surface of 221"). In addition, the distal surface 231 of the second optical fiber 23 exposed with respect to the opening 212 also forms a curved, outwardly curved surface (hereinafter referred to as "second curved surface 231"). "). A curved progressive curved surface outwardly does not encompass any bent portion. In addition, the curvature of such a curved progressive curved surface towards the outside does not become zero at any place.
    Referring to FIG. 3B, the first fiber-shaped members 220 form a distal surface 222 which defines the second curved surface 221. The second fiber-shaped members 230 form the distal surface 232 which defines the second curved surface 231.
    The second curved surface 221 is progressively connected to the first curved surface 241. The second curved surface 231 is also progressively connected to the first curved surface 241. Thus, the first curved surface 241 and the second curved surfaces 221 and 231 form a progressive curved combined surface K curved outwards. The term "progressively connected" refers to a state in which the first curved surface 241 is connected to the second curved surfaces 221 and 231 so as to form a curved progressive curved surface outwardly in the connecting section. The term "curved, outwardly curved surface" means a curved surface whose curvature does not become zero at any point and which has no portion at which the curvature can not be determined (ie ie no bends or discontinuities).
    The curvature of the second curved surface 221 in a hypothetical first plane H11 is greater than the curvature of the second curved surface 221 in a second hypothetical plane H2. Referring to FIG. 3A, the hypothetical first plane H11 is parallel to the propulsion direction P of the weft yarn Y and is parallel to the oriented direction R1 of the aperture 211 (normal direction of a plane along the the open end of the opening 211). Referring to Figures 3A and 3B, the second hypothetical plane H2 is perpendicular to the hypothetical first plane H11 and perpendicular to the propulsion direction P of the weft yarn. The curvature of the second curved surface 231 in the hypothetical first plane H12 is greater than the curvature of the second curved surface 231 in the second hypothetical plane H2. In FIGS. 3A and 3B, the hypothetical first plane H12 is parallel to the propulsion direction P of the weft yarn Y and is parallel to the oriented direction R2 of the aperture 212 (the normal direction of a plane along the vertical axis). open end of the opening 212).
    Referring to FIG. 4B, the hypothetical first planes H11 and H12 extend through a central line E and are perpendicular to the hypothetical second plane H2. In this embodiment, the combined curved surface K in the hypothetical first planes H11 and H12 has a cross-sectional configuration that forms a Cs arc. Referring to FIG. 4C, when viewed in the weft yarn propulsion direction P, the combined curved surface K has a cross-sectional configuration (cross-sectional configuration taken along the second hypothetical plane H 2 which is perpendicular to the direction of propulsion P of the weft yarn) which forms an arc Cb, the center of which represents the central line E which is parallel to the propulsion direction P of the weft yarn. Thus, the combined curved surface K extends along a path obtained by rotating the arc Cs around the center line E. In addition, the first curved surface 241 and the second curved surfaces 221 231 extend along a path that is obtained by moving the arc Cs, which represents an outwardly curved curved line, in a direction perpendicular to the propulsion direction P of the weft yarn Y. curvature of the arc Cs is greater than the curvature of the arc Cb.
    In the present embodiment, after having fixed the first optical fiber 22 and the second optical fiber 23 in the support member 20, the distal portions of the first optical fiber 22 and the second optical fiber 23 are of a grinding to obtain the distal surfaces 221 and 231 curved outwards. In other words, the distal surfaces 221 and 231 are rectified surfaces.
    The first embodiment offers the advantages described below.
    (1) A limit K1 (when referring to FIG. 3B) between the distal surface 221 (second curved surface 221) of the first optical fiber 22 and the outer surface (first curved surface 241) of the distal portion 24 of the member 20 serving as a support is part of a curved progressive surface curved outwardly. Similarly, a limit K 2 (when referring to FIG. 3B) between the distal surface 231 (second curved surface 231) of the second optical fiber 23 and the first curved surface 241 is part of a curved progressive curved surface. outwards. Thus, degradation of the warp yarns T is prevented when the support member 20 moves between the warp yarns T as it enters the shed and exits the shed.
    (2) The effect of preventing degradation of the warp yarns T increases as the curvature of the second curved surface 221 in the hypothetical first plane H11 which is parallel to the propulsion direction P of the weft yarn Y and which is parallel at the oriented direction RI of the opening 211, increases and when the curvature of the second curved surface 231 in the hypothetical first plane H12 which is parallel to the propulsion direction P of the weft yarn Y and which is parallel to the direction oriented R2 of the opening 212, increases.
    The curvatures of the second curved surfaces 221 and 231 in the hypothetical first planes H11 and H12 are greater than the curvature of the second curved surface 221 in the hypothetical second plane H2 which is perpendicular to the propulsion direction P of the weft yarn. This structure is preferable for widening the detection zone in the passage 142 while preventing the degradation of the T-warp yarns.
    (3) The detection accuracy of the weft yarn increases when the distal surface of the optical fiber is flatter. In the multi-structure optical fiber 22, which includes first bundled fiber elements 20, the distal surface 222 of each first fiber-shaped member 220 is configured to be nearly flat. Thus, the detection accuracy of the weft yarn is improved. Optical fiber 23 also has the same advantage.
    (4) When grinding the second curved surfaces 221 and 231 of the optical fibers 22 and 23, the first curved surface 241 at the distal portion 24 of the support member 20 is also partially rectified. This feature is convenient when forming a curved progressive curved surface outwardly with the combined curved surface of the first curved surface 241 and the second curved surfaces 221 and 231.
    A second embodiment of the present invention will now be discussed with reference to Fig. 5. To avoid redundancy, identical or similar reference numerals are assigned to components that are identical to the corresponding components of the first embodiment. Said components will no longer be described in detail.
    The first curved surface 241 at the distal portion 24 of the support member 20 has the same configuration as that of the first embodiment. However, the first optical fiber 22 has a second curved outwardly curved surface 221A whose curvature increases where the boundary K1 with the first curved surface 241 approaches, and the second optical fiber 23 has a second curved curved surface toward the outside 231 whose curvature increases where the limit K2 with the first curved surface 241 approaches. In other words, the second curved surfaces 221 and 231 are made to be flatter than the second curved surfaces 221 and 231 of the first embodiment.
    The structure in which the distal surfaces 221 and 231 of the first optical fiber 22 and the second optical fiber 23 are configured to be approximately flat improves the accuracy of the detection of the weft yarn.
    Those skilled in the art will appreciate that the present invention may be embodied in many other specific forms without departing from the spirit or scope of the invention. In particular, it will be understood that the present invention can be implemented in the following forms.
    As shown in FIGS. 6A and 6B, a single opening 210 can be provided in the distal portion 24 of the support member 20. The second fiber-shaped elements 230 of the second optical fiber 23B can be arranged in the central portion of the opening 210. The first fiber-shaped elements 220 of the first optical fiber 22B can be arranged around the second elements 230 in the form of fibers. fiber form.
    As shown in Figs. 7A and 7B, a single line light projection optical fiber 22C can be arranged in the aperture 211 and a single line light receiving optical fiber 23C can be arranged in the aperture 212. .
    As shown in FIG. 8, the distal surfaces 221 and 231 of the first and second optical fibers 22 and 23 may respectively encompass flat central portions 221F and 231F. In this case, the flat central portions 221F and 231F are connected to the surrounding portions (peripheral portions of the distal surfaces 221 and 231). The even portions of the distal surfaces 221 and 231 define second curved surfaces. The structure in which at least a portion of each of the distal surfaces 221 and 231 is flat contributes to improving the detection accuracy of the weft yarn.
    As shown in FIGS. 9A and 9B, the first and second optical fibers 22 and 23 can be made such that the distal surfaces 221D and 231D form an edge along a separation surface 201 (boundary between segments 25 and 26) of the member 20 as a support. In this case, the distal surfaces 221D and 231D are progressively connected to the first curved surface 241.
    The first optical fiber and the second optical fiber can be arranged in separate and adjacent members acting as a support.
    The examples and embodiments of the present invention are to be considered as illustrative and not by way of limitation, and the invention is not limited to the details which are provided here: it may be modified in the scope and equivalence of the appended claims.
    权利要求:
    Claims (7)
    [1]
    A weft detector for a loom including a flapper comb for beating a weft yarn which has been propelled by an ejected fluid into a shed formed between two rows of warp yarns, the weft detector being characterized by: a support member capable of entering the shed between warp yarns of one of the rows of warp yarns, the support member including a distal portion having an opening; and an optical fiber arranged in the support member and facing a passage for the flight of the weft yarn, formed in the flapper comb, the optical fiber including at least one of an optical fiber for projecting light, or an optical fiber for receiving light, and the optical fiber having a distal surface exposed with respect to the aperture; wherein the distal portion of the support member has an outer surface formed by a first outwardly curved curved surface; at least one peripheral portion in the distal surface of the exposed optical fiber with respect to the opening being formed by a second outwardly curved curved surface; and the second curved surface is progressively connected to the first curved surface.
    [2]
    The weft detector of claim 1, wherein the first curved surface is a curved progressive surface curved outwardly and the second curved surface is a curved progressive curved surface outwardly.
    [3]
    The weft detector of claim 1 or 2, wherein the second curved surface has a curvature that increases at locations closer to a boundary between the first curved surface and the second curved surface.
    [4]
    The weft detector according to any one of claims 1 to 3, wherein a curvature of the second curved surface in a hypothetical first plane which is parallel to the weft yarn propelling direction is greater than a curvature of the second curved surface in a second hypothetical plane which is perpendicular to the direction of propulsion of the weft yarn.
    [5]
    A frame detector according to any one of claims 1 to 4, wherein the optical fiber includes both the light-projection optical fiber and the light-receiving optical fiber, the distal surface of the projection optical fiber. comprising a flat central portion, the distal surface of the light-receiving optical fiber including a flat central portion, the central portion and the surrounding portion in the distal surface of the light-projection optical fiber being progressively connected to each other, and the central portion and its surrounding portion in the distal surface of the light receiving optical fiber being progressively connected to each other.
    [6]
    The weft detector of any one of claims 1 to 5, wherein the optical fiber includes a plurality of bundled fiber elements each having an end surface forming a portion of the second curved surface.
    [7]
    The weft detector according to claim 2, wherein the first curved surface and the second curved surface extend along a path that is obtained by moving an outwardly curved curve in a direction perpendicular to the direction of propulsion of the weft yarn.
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    同族专利:
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    引用文献:
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    CN2931513Y|2006-04-28|2007-08-08|南阳纺织集团有限公司|Jet looms abb detection device|CN102346251A|2011-11-01|2012-02-08|江苏万工科技集团有限公司|Weft yarn floatation characteristic measurement device|
    JP5999136B2|2014-05-13|2016-09-28|株式会社豊田自動織機|Weft detection device in air jet loom|
    JP6281475B2|2014-11-24|2018-02-21|株式会社豊田自動織機|Weft detection method in air jet loom|
    JP2020200560A|2019-06-13|2020-12-17|株式会社豊田自動織機|Weft detection device of loom|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP2009053940A|JP5365268B2|2009-03-06|2009-03-06|Weft detection device in jet loom|
    JP2009053940|2009-03-06|
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