JP5218321B2 - Weft detection device in jet loom - Google Patents

Description

  The present invention relates to a weft detection device in a jet loom in which wefts are inserted by fluid injection, and the wefts inserted are beaten by a wing on a sleigh.

Patent documents 1, 2, and 3 disclose a weft detection device for searching for a flying state of a weft that greatly affects the quality of the fabric.
In the weft detection device disclosed in Patent Document 1, an embodiment is disclosed in which a light projecting optical fiber and a light receiving optical fiber are provided in an air guide type support member that separates the warp rows into and out of the warp opening. Yes. The light projecting optical fiber and the light receiving optical fiber are opposed to each other with a gap through which the weft thread escapes from the air guide hole of the air guide type support member in accordance with the beating operation. Cross the light beam between the optical fiber for light and the optical fiber for light reception. As a result, weft detection is performed.

  In Patent Document 1, a light emitting diode that is a light projecting element and a phototransistor that is a light receiving element are housed in a holding beam (slay). It is not preferable for speeding up.

  In the weft detection device disclosed in Patent Document 2, a wing-shaped sensor body is provided between the wings, and a light projecting optical fiber and a light receiving optical fiber are provided in the sensor body. The light projecting optical fiber and the light receiving optical fiber are opposed to each other with a weft flying concave portion interposed therebetween, and traverse light beams between the light projecting optical fiber and the light receiving optical fiber when the weft passes through the concave portion. As a result, weft detection is performed.

  In Patent Document 2, the light transmitting module and the light receiving module are provided in the loom body (fixed portion), and the problem as in Patent Document 1 does not occur. In addition, a plastic fiber resistant to vibration and bending is used as an optical fiber reaching the optical transmission module and the optical reception module provided in the fixed portion.

  In the weft detection device disclosed in Patent Document 3, an embodiment is disclosed in which a light projecting optical fiber and a light receiving optical fiber are provided in a support member that separates the warp rows and enters and exits the warp opening. When the tip of the flying weft reaches the projection area of the light projecting optical fiber, the light projected from the tip surface (light projecting surface) of the light projecting optical fiber is reflected from the tip of the weft and is reflected on the light receiving optical fiber. Light is received at the tip surface (light receiving surface).

JP-A-53-49163 JP-A-2-234959 JP-A-5-71046

  In the weft detection device disclosed in Patent Document 3, when a light emitting element and a light receiving element are provided in a fixed portion that is fixedly disposed, a plastic fiber used in the weft detection device disclosed in Patent Document 2 is used as the optical fiber of Patent Document 3. For example, it is effective in avoiding the damage of the optical fiber accompanying the beating motion of the loom.

  However, in the optical fiber in Patent Document 3, the front end surface is exposed from the front end of the support member that separates the warp rows into and out of the warp opening, and the front end of the support member separates the warp rows into the warp opening. Each time it enters, the warp scrapes the tip of the optical fiber. Therefore, when a plastic fiber is used as the optical fiber, the tip surface of the optical fiber is worn and good weft detection cannot be performed.

  An object of the present invention is to avoid damage and wear of an optical fiber provided on a support member that scrapes warp rows and enters and exits the warp opening.

  In the present invention, the weft thread inserted by the jet of fluid is beaten by the wings on the sley, and a support member that can enter and exit from the warp row into the opening of the warp thread is provided on the slay. An optical fiber for light projection and an optical fiber for light reception facing the flying path of the weft formed on the wing from the light emitting / receiving device fixed to the stationary part fixedly disposed to the end of the supporting member on the flying path side In the invention of claim 1, the optical fiber comprises a glass fiber on the flying path side and a plastic fiber on the light projector / receiver side. The glass fiber and the plastic fiber are optically connected.

  Since glass fiber is used on the flying path side of the optical fiber, wear due to rubbing with the warp is prevented. In addition, since a plastic fiber is used on the side of the light emitter / receiver of the optical fiber, even if the optical fiber is connected to the light emitter / receiver fixed to the fixedly arranged fixed portion, the damage of the optical fiber due to the beating motion of the loom is avoided. .

In a preferred example, the glass fiber and the plastic fiber are surface bonded.
Such surface bonding is preferred for optical connection between glass fiber and plastic fiber.

In a preferred example, the optical axes at the joint surfaces of the glass fiber and the plastic fiber are aligned with each other.
Such optical axis coincidence is preferable for optical connection between glass fiber and plastic fiber.

  In a preferred example, the glass fiber and the plastic fiber are connected via a joint having a first insertion hole for inserting the end portion of the glass fiber and a second insertion hole for inserting the end portion of the plastic fiber. The first insertion hole and the second insertion hole communicate with each other.

The presence of such a joint is preferable for ensuring optical connection between the glass fiber and the plastic fiber.
In a preferred example, the joint is built in the support member.

  The joint can be fixed to the support member within the support member by using a fastening means such as an adhesive, and the optical connection between the glass fiber and the plastic fiber can be reliably maintained.

  INDUSTRIAL APPLICABILITY The present invention has an excellent effect that it is possible to avoid breakage and wear of an optical fiber provided on a support member that scrapes warp rows and enters and exits the warp opening.

The perspective view which shows 1st Embodiment. (A) is a sectional side view showing a plastic fiber. (B) is a sectional side view showing an auxiliary nozzle for weft insertion and an electromagnetic on-off valve. (A) is a sectional side view which shows a supporting member. (B) is a sectional side view showing an auxiliary nozzle for weft insertion. (A) is a sectional side view which shows a supporting member. (B) is a partial expanded side sectional view. (C) is the sectional view on the AA line of FIG.4 (b). (A) is a partial plane sectional view. (B) is a fragmentary sectional side view. (A) is a sectional side view showing a support member, (b) is a partially enlarged side sectional view, and (c) is a sectional view taken along line BB in FIG. .

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the weft Y is injected into the opening of the warp T by the air (fluid) injection of the main nozzle 12 for weft insertion on the sley 11. The weft Y injected into the opening of the warp T is subjected to air (fluid) relay injection of a plurality of auxiliary nozzles 13 for weft insertion arranged in the front mounting surface 111 of the sley 11 and the wings of the deformed kite 14 It travels in the flight path 142 formed in 141.

  As shown in FIG. 2 (b), air injection from the injection hole 131 (see FIG. 5 (a)) of the weft insertion auxiliary nozzle 13 is controlled by opening and closing the electromagnetic opening / closing valve 38. The weft insertion auxiliary nozzle 13 is connected to a pressure air supply source (not shown) via an electromagnetic on-off valve 38 attached to a breast beam 37 of the loom. When the electromagnetic on-off valve 38 is opened, the pressure air from the pressure air supply source is supplied to the weft insertion auxiliary nozzle 13. The breast beam 37 is installed on left and right side frames (not shown) constituting the skeleton of the loom.

After the weft Y of a predetermined length is inserted, the weft Y in the flying passage 142 is beaten on the front weave W1 of the woven fabric W by the wings 141 of the deformed rod 14 that swings integrally with the sley 11. The
As shown in FIGS. 3A and 3B, a support groove 16 is formed on the mounting surface 111 along the longitudinal direction of the sley 11. The support groove 16 includes a narrow portion 161 on the mounting surface 111 side, a wide portion 162 on the back side, and a step 163. A step 163 between the narrow portion 161 and the wide portion 162 is parallel to the mounting surface 111.

  As shown in FIG. 3A, a plurality of support blocks 17 are joined to the mounting surface 111. A pair of bolts 18 are inserted through the support block 17. The tip of the threaded portion 181 of each bolt 18 protrudes from the support block 17, and a lock nut 19 is screwed to these protruding end portions. The hexagonal column-shaped head 182 of the bolt 18 is accommodated in the wide portion 162. Since the corner portion of the head 182 contacts the wall surface of the wide portion 162, the lock nut 19 can be tightened. By tightening the lock nut 19, the head 182 is pressed against the step 163 and the support block 17 is fixed to the sley 11. The mounting position of the support block 17 can be changed in the longitudinal direction of the sley 11 (the weft insertion direction indicated by the arrow P in FIG. 1).

  As shown in FIG. 3B, the support block 15 that supports the weft insertion auxiliary nozzle 13 is slated by the same means as the means (bolt 18 and lock nut 19) for attaching the support block 17 to the slay 11. 11 is attached. As shown in FIG. 2B, the tip of the weft insertion auxiliary nozzle 13 can enter and leave the opening of the warp T from between the rows of the warp T as the sley 11 swings.

  As shown in FIG. 4A, a cylindrical holder 27 is fixedly supported on the support block 17. The holder 27 includes an upper-side small-diameter cylindrical portion 28 and a lower-side large-diameter cylindrical portion 29, and the large-diameter cylindrical portion 29 has a larger diameter than the small-diameter cylindrical portion 28. A rod-shaped support cylinder 20 is inserted into the cylinder of the small diameter cylinder portion 28. As shown in FIG. 2A and FIG. 5A, the front end portion 24 of the support cylinder 20 can go into and out of the opening of the warp T from between the rows of the warp T as the sley 11 swings. It is. The holder 27 and the support cylinder 20 constitute a support member that can enter and exit the warp T opening from between the rows of the warp T.

  As shown in FIG. 4B, a metal projection joint 30 </ b> A and a light reception joint 30 </ b> B are accommodated in the cylinder of the large-diameter cylindrical portion 29. The joint 30 </ b> A includes a first insertion hole 31 that extends in the cylindrical direction of the large-diameter cylindrical portion 29 and a second insertion hole 33 that extends in the cylindrical direction of the large-diameter cylindrical portion 29. The joint 30 </ b> B includes a first insertion hole 32 that extends in the cylindrical direction of the large-diameter cylindrical portion 29 and a second insertion hole 34 that extends in the cylindrical direction of the large-diameter cylindrical portion 29. The first insertion holes 31 and 32 having a circular cross section are provided with guide tapers 311 and 321 opened on the upper surfaces of the joints 30A and 30B, and the second insertion holes 33 and 34 having a circular cross section are formed on the joints 30A and 30B. Guide tapers 331 and 341 are provided on the lower surface. The first insertion hole 31 and the second insertion hole 33 have the same diameter and communicate with each other, and the first insertion hole 32 and the second insertion hole 34 have the same diameter and communicate with each other.

As shown in FIG. 5A, the support cylinder 20 is configured by coupling a pair of divided pieces 25 and 26.
As shown in FIG. 5B, an accommodation space 21 is formed in the support cylinder 20, and a light projecting glass fiber 22 and a light receiving glass fiber 23 are accommodated in the accommodation space 21. The light projecting glass fiber 22 is a multi-glass fiber in which a plurality of glass fiber elements 220 are bundled, and the light-receiving glass fiber 23 is a multi-glass fiber in which a plurality of glass fiber elements 230 are bundled.

  As shown in FIGS. 4A and 4B, the first insertion hole 31 of the joint 30A has a base end portion (an end portion opposite to the flight path 142) of the light projecting glass fiber 22 as a guide taper. The base end portion of the light-receiving glass fiber 23 is inserted from the guide taper 321 into the first insertion hole 32. The distal end portion of the light projecting plastic fiber 35 (the end portion on the light projecting glass fiber 22 side) is inserted into the second insertion hole 33 of the joint 30B from the guide taper 331, and the second insertion hole 34 receives light. A distal end portion (end portion on the light receiving glass fiber 23 side) of the plastic fiber 36 is fitted from the guide taper 341. The light projecting plastic fiber 35 is a multi plastic fiber in which a plurality of plastic fiber elements 350 are bundled, and the light receiving plastic fiber 36 is a multi plastic fiber in which a plurality of plastic fiber elements 360 are bundled. The plastic fiber elements 350 and 360 are plastic fibers excellent in light transmittance, such as acrylic resin and polycarbonate.

  The base end face 222 (joint face) of the light projecting glass fiber 22 and the front end face 351 (joint face) of the light projecting plastic fiber 35 are surface joined, and the base end face 232 (joint face) of the light receiving glass fiber 23 is joined. ) And the front end surface 361 (joint surface) of the light receiving plastic fiber 36 are surface joined. The optical axis L 1 of the light projecting glass fiber 22 and the optical axis L 2 of the light projecting plastic fiber 35 coincide with each other at the base end face 222 and the front end face 351. The optical axis L3 of the light-receiving glass fiber 23 and the optical axis L4 of the light-receiving plastic fiber 36 coincide with each other at the base end face 232 and the front end face 361. That is, the central axis 310 of the first insertion hole 31 and the central axis 330 of the second insertion hole 33 are made to coincide with each other, and the central axis 320 of the first insertion hole 32 and the central axis 340 of the second insertion hole 34 are , Matched.

  As shown in FIGS. 4B and 4C, the joints 30 </ b> A and 30 </ b> B are fixed by an adhesive 40 filled in the cylinder of the large-diameter cylindrical portion 29. In the joints 30 </ b> A and 30 </ b> B, the adhesive 40 has a base end portion of the light projecting glass fiber 22, a base end portion of the light receiving glass fiber 23, a front end portion of the light projecting plastic fiber 35, and a front end of the light receiving plastic fiber 36. The part is fixed. The adhesive 40 also fixes the base end portion of the light projecting glass fiber 22 and the base end portion of the light receiving glass fiber 23 in the cylinder of the support tube 20.

  As shown in FIGS. 1 and 2A, a light projecting / receiving device 39 is attached to a breast beam 37 as a fixed portion that is fixedly arranged. A base end portion (end portion on the side of the light projecting / receiving device 39) of the light projecting plastic fiber 35 is connected to a light projecting portion (for example, a light emitting diode) in the light projecting / receiving device 39. The unit is connected to the photoelectric conversion unit in the light projector / receiver 39.

  As shown in FIG. 5B, the front end surface 221 (end surface on the flying path 142 side) of the light projecting glass fiber 22 is exposed from the exposure hole 211 of the accommodation space 21, and the light receiving glass fiber 23 The front end surface 231 is exposed from the exposure hole 212 of the accommodation space 21. The light emitted from the light projecting unit reaches the front end surface 221 of the light projecting glass fiber 22 via the light projecting plastic fiber 35 and the light projecting glass fiber 22. The light that has passed through the light projecting glass fiber 22 is projected from the front end surface 221 toward the flight path 142.

  As shown in FIG. 5A, the light projecting region X of the light projecting glass fiber 22 is in the middle of the flight path 142, and the front end surface 231 of the light receiving glass fiber 23 is a part of the flight path 142. It arrange | positions so that it may oppose the light projection area | region X which is. When the leading end of the weft Y that has traveled through the flying path 142 reaches the light projecting region X, the light projected from the light projecting glass fiber 22 strikes and reflects the front end of the weft Y. Part of the light reflected from the front end portion of the weft Y is received by the front end surface 231 of the light receiving glass fiber 23.

  The light received by the front end surface 231 reaches the photoelectric conversion unit via the light receiving glass fiber 23 and the light receiving plastic fiber 36, and the photoelectric conversion unit outputs an electric signal corresponding to the amount of received light to the control unit ( (Not shown). Based on the input of this electric signal, the control unit grasps the arrival timing of the tip of the weft Y to the light projection region X of the light projecting glass fiber 22. The grasped information on the arrival timing of the tip of the weft Y is used for, for example, control of the injection timing and injection period of the auxiliary nozzle 13 for weft insertion at the time of future weft insertion, control of the weft brake, and the like.

  The projecting plastic fiber 35 is an optical fiber on the base end side (projecting / receiving unit 39 side) of the optical fiber from the projecting / receiving unit 39 to the support tube 20. The light projecting glass fiber 22 is an optical fiber on the leading end side (projecting region X side) of the optical fiber from the light projecting / receiving device 39 to the support tube 20. The light receiving plastic fiber 36 is an optical fiber on the proximal end side of the optical fiber from the light projecting / receiving device 39 to the support tube 20, and the light receiving glass fiber 23 is an optical fiber on the distal end side of the optical fiber from the light projecting / receiving device 39 to the support tube 20. It is. The portions from the light projecting / receiving device 39 to the holder 27 of the light projecting plastic fiber 35 and the light receiving plastic fiber 36 are repeatedly bent and deformed with the striking motion of the loom.

In the first embodiment, the following effects can be obtained.
(1) Since the light projecting glass fiber 22 and the light receiving glass fiber 23 are used on the front end side (light projecting region X side) of the optical fiber from the light projecting / receiving device 39 to the support cylinder 20, wear due to rubbing with the warp T is caused. Is prevented.

  The optical fiber (the light projecting plastic fiber 35 and the light receiving plastic fiber 36) between the light projecting / receiving device 39 fixed to the fixed part called the breast beam 37 and the holder 27 that swings together with the sley 11 is (on the side of the light projecting / receiving device 39). The optical fiber) repeatedly bends and deforms as the loom strikes. However, since the light projecting plastic fiber 35 and the light receiving plastic fiber 36 are excellent in durability against repeated bending deformation, damage due to the striking movement of the loom is avoided.

  (2) The base end face 222 of the light projecting glass fiber 22 and the front end face 351 of the light projecting plastic fiber 35 are surface-joined, and the base end face 232 of the light receiving glass fiber 23 and the front end face of the light receiving plastic fiber 36 are joined. 361 is surface-bonded. Such surface bonding between the light projecting glass fiber 22 and the light projecting plastic fiber 35 is an optical connection between the light projecting glass fiber 22 and the light projecting plastic fiber 35, that is, the front end surfaces 351, 361 and the base. Preferred for connections that provide good light transmission between the end faces 222,232. Further, such surface bonding between the light receiving glass fiber 23 and the light receiving plastic fiber 36 provides an optically good connection between the light receiving glass fiber 23 and the light receiving plastic fiber 36, that is, good light transmission. Preferred for connection.

  (3) The optical axis L1 at the base end face 222 of the light projecting glass fiber 22 and the optical axis L2 at the front end face 351 of the light projecting plastic fiber 35 are matched, and the base end face 232 of the light receiving glass fiber 23 is matched. The optical axis L3 in FIG. 5 and the optical axis L4 in the distal end surface 361 of the light receiving plastic fiber 36 are made to coincide with each other. The optical axis coincidence between the light projecting glass fiber 22 and the light projecting plastic fiber 35 is preferable for optically good connection between the light projecting glass fiber 22 and the light projecting plastic fiber 35. The optical axis coincidence between the light-receiving glass fiber 23 and the light-receiving plastic fiber 36 is preferable for optically good connection between the light-receiving glass fiber 23 and the light-receiving plastic fiber 36.

  (4) The presence of the joint 30A having the first insertion hole 31 and the second insertion hole 33 ensures an optically good connection (surface bonding) between the light projecting glass fiber 22 and the light projecting plastic fiber 35. This is preferable. In addition, the presence of the joint 30B having the first insertion hole 32 and the second insertion hole 34 ensures an optically good connection (surface bonding) between the light receiving glass fiber 23 and the light receiving plastic fiber 36. Is preferable.

  (5) The joints 30A and 30B are fixed to the holder 27 by the adhesive 40 in the holder 27. The adhesive 40 for fixing the joints 30A and 30B includes the light projecting glass fiber 22 and the light projecting plastic fiber 35. In addition, the light receiving glass fiber 23 and the light receiving plastic fiber 36 are fixed in the insertion holes 31, 32, 33 and 34. The presence of the joints 30A and 30B is to maintain the optical connection (surface bonding) of the light projecting glass fiber 22 and the light projecting plastic fiber 35, and to optically connect the light receiving glass fiber 23 and the light receiving plastic fiber 36. Contributes to maintaining (surface bonding).

  (6) The weft detection accuracy increases as the distal end surfaces of the light projecting glass fiber 22 and the light receiving glass fiber 23 are closer to a flat surface. In the multi-structured glass fibers 22 and 23 in which a plurality of glass fiber elements 220 and 230 are bundled, even if the front end surfaces of the light projecting glass fiber 22 and the light receiving glass fiber 23 are curved, The surface shape of the tip surfaces of the elements 220 and 230 approaches a flat surface, and the weft detection accuracy is improved.

Next, a second embodiment shown in FIGS. 6A, 6B, and 6C will be described. The same reference numerals are used for the same components as those in the first embodiment, and detailed description thereof is omitted.
In the second embodiment, the first insertion holes 31 and 32 and the second insertion holes 33 and 34 are formed in a single joint 30C. The diameter of the light projecting glass fiber 22 and the diameter of the light projecting plastic fiber 35 are different, and the diameter of the light receiving glass fiber 23 and the diameter of the light receiving plastic fiber 36 are different. In the illustrated example, the diameter of the light projecting plastic fiber 35 is larger than the diameter of the light projecting glass fiber 22, and the diameter of the light receiving plastic fiber 36 is larger than the diameter of the light receiving glass fiber 23. The difference in the diameters is that, for example, the diameters of the plastic fibers 35 and 36 that can be placed in the large-diameter cylindrical portion 29 that has a larger storage space than in the support cylinder 20 can be made larger than the diameters of the glass fibers 22 and 23. Further, this is in accordance with the difference in light transmission between the plastic fibers 35 and 36 and the glass fibers 22 and 23.

  In accordance with such a difference in diameter, the diameter of the first insertion hole 31 and the diameter of the second insertion hole 33 of the joint 30C are different from each other. The diameter of the first insertion hole 32 and the diameter of the second insertion hole 34 are different. Is different. The central axis 310 of the first insertion hole 31 and the central axis 330 of the second insertion hole 33 are matched, and the central axis 320 of the first insertion hole 32 and the central axis 340 of the second insertion hole 34 are matched. I'm allowed. That is, the optical axis L1 and the optical axis L2 are matched at the base end face 222 and the tip end face 351, and the optical axis L3 and the optical axis L4 are matched at the base end face 232 and the tip end face 361.

  Although the diameter of the light projecting glass fiber 22 and the diameter of the light projecting plastic fiber 35 are different, the diameter of the light receiving glass fiber 23 and the diameter of the light receiving plastic fiber 36 are different, but the optical axes L1, L2 are different. And the coincidence of the optical axes L3 and L4 have the same effect as the item (3) in the first embodiment.

In the present invention, the following embodiments are also possible.
If the joints 30A, 30B, and 30C are fixed to the holder 27, the joints 30A, 30B, and 30C may protrude from the holder 27.

  The connection between the light projecting glass fiber 22 and the light projecting plastic fiber 35 and the connection between the light receiving glass fiber 23 and the light receiving plastic fiber 36 may be performed using a transparent adhesive.

The support cylinder 20 and the holder 27 may be integrally formed.
○ A single-fiber optical fiber may be used as the plastic fiber on the base end side.
The light projecting optical fiber and the light receiving optical fiber may be provided separately on separate support members.

The technical idea that can be grasped from the embodiment described above will be described below.
(A) The weft detection device in a jet loom according to any one of claims 1 to 5, wherein the optical fiber is configured by bundling a plurality of fiber elements.

  In the multi-configuration in which a plurality of fibers are bundled, the weft detection accuracy is improved as compared with the case where a single optical fiber is used.

  141 ... Tsubasa. 142 ... A flying passage. 20 ... A support cylinder constituting a support member. 211, 212 ... exposed holes. 21: Storage space. 22 ... Glass fiber for floodlight. 23: Glass fiber for light reception. 220, 230 ... Glass fiber element. 222, 232 ... Base end surfaces as joint surfaces. 27: A holder constituting the support member. 30A, 30B, 30C ... Fittings. 31 ... 1st insertion hole. 32 ... 1st insertion hole. 33 ... 2nd insertion hole. 34 ... 2nd insertion hole. 35 ... Plastic fiber for floodlight. 36: Plastic fiber for light reception. 350, 360 ... Plastic fiber element. 351, 361... Tip surfaces as bonding surfaces. 37 ... A breast beam as a fixed part. Y ... Weft. T ... Warp. P: Weft insertion direction. L1, L2, L3, L4 ... Optical axis.

Claims (5)

The weft thread inserted by the fluid injection is beaten by the wings on the sley, and a support member that can enter and exit from the warp row into the opening of the warp thread is provided on the slay, and is fixedly arranged. At least one of a light projecting optical fiber and a light receiving optical fiber facing the flying path of the weft formed on the wing from the light projecting / receiving device fixed to the fixed part to the flying path side end of the support member In the weft detection device in the jet loom where the optical fiber is provided,
The optical fiber includes a glass fiber on the flying path side and a plastic fiber on the light projector / receiver side, and the weft detection device in a jet loom in which the glass fiber and the plastic fiber are optically connected.   The weft detection device in a jet loom according to claim 1, wherein the glass fiber and the plastic fiber are surface bonded.   The weft detection device in a jet loom according to claim 2, wherein the optical axes of the joint surfaces of the glass fiber and the plastic fiber are made to coincide with each other.   The glass fiber and the plastic fiber are connected via a joint having a first insertion hole for inserting the end portion of the glass fiber and a second insertion hole for inserting the end portion of the plastic fiber, The weft detection device in a jet loom according to any one of claims 1 to 3, wherein the first insertion hole and the second insertion hole communicate with each other.   The weft detection device in a jet loom according to claim 4, wherein the joint is incorporated in the support member.

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