JP2011063897A - Weft detecting device for water-jet weaving machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weft detecting device which can make a light axis of a light-emitting section easily match with a light axis of a light-receiving section when reassembling after disassembling a splitting type feeler head used for a water-jet weaving machine. <P>SOLUTION: The feeler head 2 includes the light-emitting section 4 and the light-receiving section 5 which face each other across a slit 3. The feeler head 2 includes a first head member 7 equipped with the light-emitting section 4, a second head member 8 equipped with the light-receiving section 5, and a support member 9 which supports the first and the second head members 7, 8. At least one of the first and the second head members 7, 8 is installed on the support member 9 through a positioning mechanism 10 which controls the positions of the first and the second head members 7, 8 against the support member 9 in two directions orthogonal to the light axis 6. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a weft detection device used in a water jet loom.

  As one of the weft detection devices used in water jet looms, it has a feeler head formed with slits for receiving wefts that are transported toward the front of the weave in accordance with the punching operation. There is a type in which the weft passing through the slit is detected by a light part and a light receiving part to determine the success or failure of the weft insertion.

  The feeler head is generally a slit formed by cutting a single member by cutting (hereinafter referred to as “integrated type”), but a pair of upper and lower separate members are spaced apart. There are also those that form slits by facing each other (hereinafter referred to as “divided type”) (for example, see Patent Documents 1 and 2).

  Since the integrated feeler head fixes the light projecting unit and the light receiving unit to a single member, the optical axes of the light projecting unit and the light receiving unit (hereinafter also simply referred to as “optical axis”) are aligned once. As long as there is no deformation of the member, there is an advantage that the optical axis is not displaced. However, in general, the interval between the slits is narrow (2 mm or less), so that the state of the detection surface (light projecting surface and light receiving surface) cannot be visually confirmed. In particular, in a water jet loom, the weft passes between the slits at a rate of several hundred times per minute (1000 or more at most). Dirt adheres or wear occurs, and the dirt and wear may adversely affect the weft detection. For this reason, the drawback of the integrated feeler head that it is difficult to check and clean the state of the detection surface is a maintenance problem for realizing stable weft detection.

  On the other hand, the split type feeler head, for example, as disclosed in Patent Documents 1 and 2, is a slit upper member including a light projecting unit (upper member, (upper) holder) and a slit lower side including a light receiving unit. These members (lower member, (lower) holder) can be divided, and the upper and lower members are detachably supported by support members (brackets) separate from these members. Therefore, by removing one or both of the upper member and the lower member from the support member, there is an advantage that the state of the detection surface can be visually confirmed and maintenance work such as cleaning is easy.

  In the configuration described in Patent Document 1, the upper member and the lower member are fastened together with the support member by a common screw member (bolt) and fixed to the support member. In the configuration described in Patent Document 2, the upper member and the lower member are respectively attached to the support member by screw members (screws). However, in the configuration of Patent Document 2, each of the upper and lower members has an elongated hole through which the screw member is inserted, and the front and rear directions (optical axis) of the upper and lower members with respect to the support member. And the position in the direction perpendicular to the weft) can be adjusted.

  However, the above-described split type feeler head has the following drawbacks. That is, in the configuration of the above prior art, the upper member and / or the lower member are removed from the bracket as the support member for maintenance work, and when the maintenance work is reassembled to the bracket, the positioning of these members is accurate. However, the optical axis of the light projecting unit and the optical axis of the light receiving unit are shifted from each other, and there is a problem that the facing accuracy between the light projecting unit and the light receiving unit cannot be maintained before and after the maintenance work.

  More specifically, in the case of the configuration of Patent Document 1, the position is fixed by tightening a screw, but generally there is a play between a thread of a male screw and a female screw screwed into the screw thread and a screw groove. Since there is a (gap), in the process of tightening the screw, the upper member and the lower member may be displaced in the front-rear direction within the range of play, and the optical axis may be shifted.

  In the configuration of Patent Document 2, as described above, the position of the upper member and the lower member can be adjusted in the front-rear direction with respect to the bracket. Depending on how the worker is assembled, the light projecting unit and the light receiving unit are provided. Are assembled in a state shifted in the front-rear direction, and the optical axis may be shifted.

  As described above, in the configurations of Patent Documents 1 and 2, the facing accuracy between the light projecting unit and the light receiving unit depends on the assembly work by the operator, and the light projecting unit and the light receiving unit are accurately opposed to each other. In order to do this, the work must be complicated, and time and labor are required for the maintenance work.

  And if the facing state of the light projecting unit and the light receiving unit changes, the amount of light incident on the light receiving unit changes, so the detection sensitivity cannot be kept constant before and after maintenance work, and gain etc. are adjusted each time maintenance work is performed In the case of poor adjustment, wefts cannot be accurately detected.

JP 58-208445 A

Japanese Patent Laid-Open No. 51-58566

  Therefore, an object of the present invention relates to a weft detection device having a split type feeler head among the weft detection devices used in a water jet loom, and when reassembling the feeler head for maintenance work, Another object of the present invention is to provide a weft detection device capable of easily matching the optical axis of the light projecting unit and the optical axis of the light receiving unit.

  Under the above-mentioned problems, the present invention has the following configuration of the weft detection device (1) used for the water jet loom. That is, the weft detection device (1) of the present invention has a feeler head (2) provided with a slit (3) that is provided on the side opposite to the yarn feeding side and that accepts the weft (20) that moves in accordance with the beating operation. The feeler head (2) includes a light projecting section (4) and a light receiving section (5) facing each other with the optical axis (6) aligned with the slit (3) interposed therebetween. 6) The presence / absence of the weft insertion is determined by detecting the presence or absence of the weft (20) passing through.

  The feeler head (2) includes a first head member (7) having the light projecting portion (4), a second head member (8) having the light receiving portion (5), the first and first head members. A support member (9) for supporting the two head members (7, 8), and the optical axis (6) of at least one of the first and second head members (7, 8) with respect to the support member (9). ) And a positioning mechanism (10) that regulates a position in a direction orthogonal to.

  The positioning mechanism (10) includes a first restriction surface (7a, 8a) and a first contact surface (94a) for restricting the position in a first direction orthogonal to the optical axis (6). A second restriction surface (75a, 85a) and a second contact surface (94b) for restricting the position in a second direction that is orthogonal to the optical axis (6) and different from the first direction; The fixing member (13) for maintaining the contact state of the 2nd control surface (75a, 85a) and the 2nd contact surface (94b) is included.

  The first regulating surfaces (7a, 8a) are two surfaces formed on at least one of the first and second head members (7, 8) so as to face in opposite directions. It is a surface formed so as to intersect the direction of 1. The first contact surface (94a) is two surfaces formed on the support member (9) so as to contact each of the first restriction surfaces (7a, 8a). The second restriction surfaces (75a, 85a) are formed on the first head member (7) and / or the second head member (8) on which the first restriction surface is formed, It is the surface formed so that it might cross | intersect with respect to 2 directions. The second abutment surface (94b) is a surface formed on the support member (9) so as to abut on the second restriction surface (75a, 85a).

  Examples of the first direction and the second direction orthogonal to the optical axis (6) include the longitudinal direction and the width direction of the head member, the warp direction and the weaving direction of the loom. The first direction and the second direction do not have to be orthogonal.

  The first regulating surface (7a, 8a) and the first contact surface (94a) in the positioning mechanism (10) are formed in parallel with the optical axis (6) in the longitudinal direction, The first contact surface (94a) may be formed longer than the first restriction surface (7a, 8a) in the longitudinal dimension.

  Further, one of the first restriction surfaces (7a, 8a) and the first contact surface (94a) is on both sides of the convex rail (11) formed in parallel with the optical axis (6). The other of the first restricting surfaces (7a, 8a) and the first contact surface (94a) is formed in parallel with the optical axis (6) and the convex rail ( 11) are both side surfaces of the concave groove (12) that fits in, and the fixing member (13) includes the first head member (7) and the second head member in which the concave groove (12) is formed. The positioning mechanism (10) may be configured so as to be a member that fixes at least one of (8) and the support member (9) at an arbitrary position on the convex rail (11).

  The feeler head (2) of the weft detection device (1) includes a first head member (7) having a light projecting part (4), a second head member (8) having a light receiving part (5), And a support member (9) for supporting the first and second head members (7, 8), and positioning at least one of the first head member (7) and the second head member (8). Since the mechanism (10) is positioned in two directions orthogonal to the optical axis (6) and is attached to the support member (9) so as to maintain the state of being positioned by the fixing member (13), the light projecting portion (4 ) And visual recognition of dirt adhering to the detection surface of the light receiving unit (5), and maintenance work such as cleaning of the detection surface is facilitated, and the feeler head (2) is disassembled for maintenance work and then reassembled. When the floodlight The optical axis and the light receiving portion 4) and the optical axis (5) can be easily matched. For this reason, before and after the maintenance work, the facing state of the light projecting unit (4) and the light receiving unit (5) can be easily made the same, and the adjustment of the optical axis, the gain, etc. is performed again after the maintenance. There is no need.

  Further, the optical axis of at least one of the first and second head members (7, 8) is made to coincide with the optical axis (6) of the light projecting part (4) and the light receiving part (5) by the positioning mechanism (10). Since it is attached to the support member (9) so as to be movable in the direction, the slit width can be adjusted in accordance with the weft while keeping the optical axis (6) coincident. Therefore, while the feeler head with a fixed slit width has a limited yarn type that can be detected, the feeler head (2) of the present invention has different thicknesses by adjusting the slit width corresponding to various yarns. Can be detected. Specifically, in the case of a thin thread, the slit width can be reduced to increase the detection accuracy. In the case of detecting a thick thread, the slit width is increased to allow the passage of a thick thread through the slit. do it.

It is a perspective view which shows the outline | summary of the weft detection apparatus in one Example of this invention, and its periphery structure. It is a disassembled perspective view of the feeler head of the weft detection apparatus in one Example of this invention. It is the partial cross section side view (a) of the feeler head of the weft detection apparatus in one Example of this invention, and the partial expanded sectional view (b) around a slit. It is AA sectional drawing in Fig.3 (a). 2 is a partially enlarged cross-sectional view showing each embodiment of a positioning mechanism 10. FIG. It is a partial expanded sectional view which shows the other embodiment of the positioning mechanism. It is a partial expanded sectional view which shows the other embodiment of the positioning mechanism.

  FIG. 1 shows an embodiment of the weft detection device 1 of the present invention attached to a water jet loom. FIG. 1 shows an enlarged view of a yarn feeding side such as a reed 24 extending in the weaving width direction of the loom, and the weft detection device 1 is located on an extension line of the front of the weaving 22 on the yarn feeding side of the loom. It is arranged near the end of the weave.

  The weft detection device 1 of the present embodiment includes a feeler head 2 including an optical fiber for light projection and reception of an optical fiber type photoelectric sensor, an amplifier unit 30 of the sensor, and a signal processing circuit for processing an output signal of the amplifier unit 30. 31. The feeler head 2 includes a first head member 7, a second head member 8, and a support member 9 that supports the first and second head members 7, 8. The head members 7 and 8 are fixed to the support member 9 by a fixing member 13 at an interval to form a slit 3 that opens to the flange 24 side. The width of the slit 3 is larger than the thread diameter of the weft 20 so that the weft 20 can pass between the slits 3. Specifically, the fixing member 13 includes a fixing screw 13a, a holding washer 13b, and a nut (not shown). By loosening the fixing screw 13a, the first head member 7 and the second head member 8 are support members. 9 can be easily removed.

  The support member 9 is fixed to a frame or the like of a loom (not shown) by a stay (not shown) using an attachment hole 91. The first head member 7 incorporates an optical fiber 4a on the light projecting side of the sensor, and the second head member 8 incorporates an optical fiber 5a on the light receiving side of the sensor. The distal end of the optical fiber 4a and the distal end of the optical fiber 5a are opposed to each other with the optical axis 6 aligned with the slit 3 interposed therebetween, and the distal end of the optical fiber 4a functions as the light projecting unit 4. The tip functions as the light receiving unit 5. As in Patent Document 2, a light emitting diode as a light projecting unit and a phototransistor as a light receiving unit are directly built in the first head member 7 and the second head member 8, respectively, and they are sandwiched by the slit 3. You may make it oppose. Further, the vertical relationship of the light projecting unit 4, the light receiving unit 5, that is, the optical fiber 4a, and the optical fiber 5a may be opposite to the illustrated example.

  The optical fibers 4 a and 5 a are merged in the feeler head 2 and drawn out of the feeler head 2 as a single fiber cable 14. The other end of the drawn fiber cable 14 is connected to the amplifier unit 30.

  Although not shown, the amplifier unit 30 includes a light emitting diode as a light projecting element, a light projecting circuit that drives the light projecting element, a phototransistor as a light receiving element, an amplifier circuit that amplifies the output from the light receiving element, and an output of the amplifier circuit. Based on this, an output circuit for outputting a binary output signal of incident light and light shielding is provided. The light generated by the amplifier unit 30 is projected from the tip of the optical fiber 4 a (light projecting unit 4) to the slit 3 through the optical fiber 4 a and is incident on the tip of the optical fiber 5 a (light receiving unit 5). The optical axis 6 is formed in Thus, the weft detection device 1 of the present embodiment is configured as a transmissive photoelectric sensor, and the weft detection device 1 detects the weft 20 when the weft 20 interrupts the optical axis 6.

  The signal processing circuit 31 that processes the output signal of the amplifier unit 30 determines that weft insertion is normal when the optical axis 6 is shielded by the weft 20 within a predetermined time after weft insertion. On the other hand, if the optical axis 6 is not shielded by the weft 20 even after a predetermined time has elapsed after weft insertion, it is determined that the weft insertion is defective.

  The weft 20 that is inserted into the opening of the warp 21 along the jet flow of the weft insertion nozzle 23 provided on the yarn supply side is carried toward the weaving front 22 along with the punching operation of the reed 24, and the reed Be beaten. At this time, the leading end portion of the weft 20 is conveyed toward the slit 3 of the feeler head 2 of the weft detection device 1 by the lead plate 25 that swings together with the collar 24.

  A relief hole 25a is formed in the lead plate 25 at a position facing the feeler head 2, and the feeler head 2 enters the relief hole 25a as the lead plate 25 advances to the front side of the weave by a hammering operation. . For this reason, when the weft insertion is performed normally and the leading end portion of the weft yarn 20 has reached the predetermined position beyond the weaving end on the counter-feeding side, the leading end portion of the weft yarn 20 is in the process of beating operation. The optical axis 6 formed by the light projecting unit 4 and the light receiving unit 5 is shielded by being pushed by the lead plate 25 and passing through the slit 3 of the feeler head 2. The signal processing circuit 31 of the weft detection device 1 that has detected the weft 20 determines that the weft insertion has been performed normally, and based on this determination, the main controller of the loom (not shown) continues weaving.

  On the other hand, if for some reason the tip of the weft 20 does not reach the weave end on the counter-feeding side, the tip of the weft 20 does not pass through the slit 3 in the process of beating, and the optical axis 6 is shielded from light. Therefore, the weft detection device 1 does not detect the weft 20. The signal processing circuit 31 of the weft detection device 1 that has not detected the weft 20 transmits a weft insertion failure signal to a main controller of the loom (not shown), and the main controller of the loom stops the loom.

  The weft yarn 20 that has been normally wefted and beaten is held at its tip by a plurality of entangled yarns 26. Thereafter, the tip portion of the weft 20 is separated from the woven fabric 27 together with the entangled yarn 26 by a cutter (not shown) installed between the woven fabric 27 and the feeler head 2 at an appropriate timing.

  2 and 3 show details of the feeler head 2 of the weft detection device 1 of this embodiment. In FIG. 2, the optical fibers 4a and 5a are not shown, and a part of the support member 9 is a cross section. For convenience of explanation, the direction is determined as shown in FIG. As described above, the feeler head 2 includes the first head member 7, the second head member 8, and the support member 9 as main members. These members are provided with a convex rail 11, a concave groove 12, and the like as a positioning mechanism 10 for positioning the mounting positions of the first head member 7 and the second head member 8 with respect to the support member 9. Hereinafter, each member will be described in detail.

  Each of the first head member and the second head member 8 is a plate-like member, and is made of a rust-resistant material such as brass. The first head member 7 and the second head member 8 have mirror-symmetric shapes, the former includes an optical fiber 4a on the light projecting side of the photoelectric sensor, and the latter receives light from the photoelectric sensor. The optical fiber 5a on the side is built in.

  In the following description, the first head member 7 of the first head member 7 and the second head member 8 will be mainly described. However, as described above, the first head member 7 and the second head member 7 are the same. Since the head member 8 is mirror-symmetrical, the description of the first head member 7 also applies to the second head member 8 unless otherwise specified.

  An arc portion 71 is formed at one end of the first head member 7 in the longitudinal direction. The arc-shaped portion 71 is opposed to the arc-shaped portion 81 of the second head member 8 and forms a guide portion 15 that opens to the heel side and communicates with the slit 3. The guide portion 15 has a function of reliably guiding the leading end portion of the weft 20 that is conveyed toward the front of the weave by the beating operation to the slit 3.

  A slit surface 72 is formed in a region adjacent to the arc-shaped portion 71. The slit surface 72 is opposed to the slit surface 82 formed in the second head member 8 in parallel with the positioning mechanism 10 described later, and forms the slit 3. As shown in FIG. 3B, an optical fiber insertion hole 73 for fixing the tip of the optical fiber 4 a is machined perpendicularly to the slit surface 72 at the center of the slit surface 72. The tip of the optical fiber 4 a fixed in the optical fiber insertion hole 73 functions as the light projecting unit 4. The tip of the optical fiber 5 a fixed in the optical fiber insertion hole 83 of the second head member 8 functions as the light receiving unit 5.

  The optical fiber insertion hole 73 communicates with a wiring hole 73 a formed in the longitudinal direction of the first head member 7, and the wiring hole 73 a opens at the other end opposite to the arcuate portion 71. The optical fiber 4a having the distal end fixed to the optical fiber insertion hole 73 is routed through the wiring hole 73a, pulled out from the opening of the wiring hole 73a, and passed through a wiring hole 96 (to be described later) of the support member 9 to be second. The head member 8 merges with the optical fiber 5a. The joined optical fibers 4 a and 5 a are drawn out from the fiber lead-out portion 93 to the outside of the feeler head 2 as a single fiber cable 14 and connected to the amplifier unit 30. The wiring holes 73a and the wiring holes 96 are rounded at the corners so that no stress is applied to the optical fiber 4a.

  A concave portion 74 is formed in a portion opposite to the arc-shaped portion 71 across the slit surface 72. The recess 74 faces the recess 84 of the second head member 8 and forms a space wider than the slit 3. This space receives the leading end portion of the weft 20 after passing through the slit 3 and prevents the leading end portion of the weft 20 separated from the woven fabric 27 by the cutter (not shown) from being caught on the feeler head 2. This is so that the tip portion of the weft 20 can be quickly detached from the feeler head 2.

  An attachment portion 75 for attaching the first head member 7 to the support member 9 is formed at the other end opposite to the arc-like portion 71. The attachment portion 75 is formed with a restriction surface 75 a that faces the support member 9, and this restriction surface 75 a functions as a second restriction surface that is one of the components of the positioning mechanism 10.

  Further, a concave groove 12a that fits with the convex rail 11 formed on the support member 9 is formed on the regulation surface 75a. The concave groove 12 a is formed in parallel with the optical fiber insertion hole 73, that is, the optical axis 6, and the regulation surfaces 7 a constituting both side surfaces of the groove are two components that are one of the components of the positioning mechanism 10. It functions as a first restriction surface.

  Furthermore, a through hole 76 is formed in the attachment portion 75 on the side opposite to the arc-shaped portion 71 with the concave groove 12 interposed therebetween. A fixing screw 13 a for attaching the first head member 7 to the support member 9 is inserted into the through hole 76. As will be described later, the fixing screw 13a is also one of the components of the positioning mechanism 10.

  Next, the support member 9 will be described. The support member 9 is a block-like member, and is made of a rust-resistant material such as brass, like the first head member. The support member 9 is a bracket portion 92 used for fixing the entire feeler head 2 to the loom, a fiber lead portion 93 from which the fiber cable 14 is drawn, a base portion of the bracket portion 92 and the fiber lead portion 93, and a first member. And a head member support portion 94 that supports the first head member and the second head member 8.

  The bracket portion 92 has a plate shape protruding from the head member support portion 94. The bracket portion 92 is formed with an attachment hole 91 penetrating in the thickness direction of the plate. As described above, the attachment hole 91 illustrates the support member 9, that is, the feeler head 2 as a whole via a stay or the like (not shown). Used to fix to the main body of the loom.

  As shown in FIG. 3A, the fiber lead-out portion 93 protrudes obliquely upward from the upper portion of the head member support portion 94 and is provided with a notch 95 that locks the connector portion 14 a of the fiber cable 14. Further, one end of a wiring hole 96 through which the optical fibers 4a and 5a pass is provided on the end face of the tip of the fiber lead-out part 93, and the wiring hole 96 passes through the fiber lead-out part 93 and will be described later. It communicates with the head member support portion 94.

  The head member support portion 94 has a substantially rectangular contact surface 94b that is recessed from the bracket portion 92 and the fiber lead-out portion 93 when viewed from the counter yarn feeding side with the feeler head 2 attached to the loom (see FIG. 1). The contact surface 94 b functions as a second contact surface that is one of the components of the positioning mechanism 10. The contact surface 94b is formed with a long mounting hole 97 into which the fixing screw 13a is inserted, and a convex rail 11 that fits into the concave groove 12. The abutment surfaces 94 a that constitute both side surfaces of the convex rail 11 function as two first abutment surfaces that are one of the components of the positioning mechanism 10.

  In the illustrated example, the convex rail 11 is integrally formed with the head member support portion 94, but a separate plate member may be attached to the head member support portion 94 and used as the convex rail 11. On the inner wall 98 adjacent to the fiber lead-out portion 93 of the head member support portion 94, the other opening portion of the wiring hole 96 is provided.

  Next, the positioning mechanism 10 that regulates the positions of the first head member 7 and the second head member 8 relative to the support member 9 will be described. In this embodiment, the positioning mechanism 10 includes a convex rail 11 provided on the support member 9, and concave grooves 12 a and 12 b that are formed on the first and second head members 7 and 8 and fit into the convex rail 11. The first and second head members 7 and 8 include a fixing screw 13a as a fixing member 13 for fixing the first and second head members 7 and 8 at an arbitrary position on the convex rail 11, a holding washer 13b, and a nut 13c. In the positioning mechanism 10 of the present embodiment, the positions of the first head member 7 and the second head member 8 with respect to the support member 9 are orthogonal to the front-rear direction and the optical axis direction as a first direction orthogonal to the optical axis direction. It is configured to allow movement in the optical axis direction while restricting in the width direction as the second direction.

  The position restriction in the front-rear direction is realized by the convex rail 11 of the support member 9 and the concave grooves 12a and 12b of the first and second head members 7 and 8. The convex rail 11 and the concave grooves 12a and 12b are processed so as to fit with high precision to such an extent that no looseness occurs, and the first and second head members 7 are fitted together by fixing screws 13a. , 8 are attached to the support member 9, the positions of the first and second head members 7, 8 with respect to the support member 9 in the front-rear direction are regulated.

  That is, in a state where the convex rail 11 and the concave grooves 12a and 12b are fitted, the two first restricting surfaces 7a and 8a that are formed so as to face each other and intersect the front-rear direction are directed in opposite directions. The first and second head members 7 and 8 move in the front-rear direction with respect to the support member 9 because the two first abutment surfaces 94a that are formed as described above and intersect with the front-rear direction are in contact with each other. In addition, the support member 9 is not inclined on a plane including the optical axis direction and the front-rear direction. Therefore, the first and second head members 7 and 8 can always be assembled to the support member 9 at the same position in the front-rear direction by the positioning mechanism 10, and the slit surface 72 of the first head member 7, It is possible to always face the slit surface 82 of the second head member 8 in parallel.

  On the other hand, the position restriction in the width direction is performed by the restriction surfaces 75a and 85a of the mounting portions 75 and 85 of the first and second head members 7 and 8, and the contact surface 94b of the head member support portion 94 of the support member 9. Realized. The contact surfaces 75a and 85a and the surface of the head member support portion 94 are finished to a flat surface with high accuracy. The restricting surfaces 75a and 85a are brought into contact with the contact surface 94b of the head member support portion 94 and fixed by the fixing screw 13a. By fixing the first and second head members 7 and 8 to the support member 9, the positions in the width direction of the first and second head members 7 and 8 with respect to the support member 9 are restricted.

  That is, in a state where the first and second head members 7 and 8 are fixed to the support member 9 by the fixing screw 13a, the second restriction surfaces 75a and 85a intersecting the width direction and the contact surface 94b are in contact with each other. In addition, the first and second head members 7 and 8 are pressed against the head member support portion 94 by the fixing screw 13a so that the contact state is maintained, so the first and second head members 7 , 8 do not move in the width direction with respect to the support member 9 and do not become inclined with respect to the support member 9 on a plane including the width direction and the front-rear direction. Therefore, the first and second head members 7 and 8 can always be assembled to the support member 9 at the same position in the width direction by the positioning mechanism 10, and the first head member 7 and the second head member 8 can always be arranged on the same plane including the optical axis direction and the front-rear direction. The height h of the convex rail 11 is set to be smaller than the depth d of the concave grooves 12a and 12b, so that the second restriction surfaces 75a and 85a and the contact surface 94b come into contact with each other reliably. ing.

  As described above, the first and second head members 7 and 8 have a mirror-symmetric structure, the distance in the front-rear direction from the concave grooves 12a and 12b to the optical axis 6 (optical fiber insertion holes 73 and 83), and the regulating surface. The distance in the width direction from 75a, 85a to the optical axis 6 is the same. Moreover, since the concave grooves 12 a and 12 b are formed in parallel with the optical axis 6, the first and second head members 7 and 8 are attached to the support member 9 via the positioning mechanism 10 to form the light projecting portion 4. The tip of the optical fiber 4a and the tip of the optical fiber 5a as the light receiving unit 5 are always in a state of being accurately opposed with the optical axis 6 aligned.

  Therefore, according to the configuration shown in the figure, when the first head member 7 and / or the second head member 8 are removed from the support member 9 and then reattached, the convex rail 11 and the concave grooves 12a and 12b , And the regulating surfaces 75a and 85a are brought into contact with the contact surface 94b of the head member support portion 94 and fixed by the fixing screw 13a, so that the optical axis of the light projecting portion 4 and the optical axis of the light receiving portion 5 can be easily obtained. Even after reattachment, the opposing state of the light projecting surface 4b and the light receiving surface 5b can be made the same as before removal.

  Furthermore, in the present embodiment, the first and second head members have dimensions in the optical axis direction (longitudinal direction) of the contact surface 94a (first contact surface) of the convex rail 11 formed on the support member 9. 7 and 8 are formed to be larger than the sum of the dimensions in the optical axis direction of the restriction surfaces 7a and 8a (first restriction surfaces), and the attachment long hole 97 has a large dimension in a direction parallel to the convex rail 11. Since it is a long hole, the first head member 7 and the second head member 8 can be fixed at any position on the convex rail 11 by the fixing screw 13a. With this configuration, the position of the first and second head members 7, 8 with respect to the support member 9 in the optical axis direction can be adjusted within the range of the attachment elongated hole 97. Thereby, the space between the slit surfaces 72 and 82, that is, the width of the slit 3 can be adjusted without shifting the optical axis of the light projecting unit 4 and the optical axis of the light receiving unit 5, and the weft used for weaving. The width of the slit 3 can be easily changed according to the 20 types.

  In the illustrated embodiment, a holding washer 13b exists on the opposite side of the support member 9 with the first and second head members 7 and 8 interposed therebetween. The fixing screw 13a passes through the holding washer 13b, the first and second head members 7, 8 and the attachment long hole 97 of the support member 9, and a nut 13c is screwed to the tip thereof as shown in FIG. Thereby, the 1st, 2nd head members 7 and 8 and the support member 9 are clamped and fixed in the state pinched by the holding washer 13b and the nut 13c.

  As mentioned above, although one Example of this invention was described with reference to FIGS. 1-4, embodiment of this invention is not restricted to what was shown in FIGS.

  In the embodiment shown in FIGS. 1 to 4, as shown in FIG. 5A, a concave groove 12 as a first regulating surface is formed on the first and second head members 7, 8 side, and the support member 9. The convex rail 11 as the first contact surface is formed on the side, but for example, as shown in FIG. 5B, the first restriction is formed on the first and second head members 7 and 8 side. The convex rail 111 as a surface may be formed, and the concave groove 112 as a first contact surface may be formed on the support member 9 side.

  In each of the embodiments described above, rectangular grooves and convex rails are used as the concave grooves and convex rails. However, as shown in FIG. 5C, the concave grooves 212 are provided and the convex rails 211 are provided. It is good. In this case, the concave groove 212 and the convex rail 211 as the positioning mechanism 10 can be regulated to some extent in the width direction in addition to the position regulation in the front-rear direction. Although not shown, the concave groove may be a T-shaped groove and the convex rail may be a T-shaped rail.

  In the embodiment shown in FIGS. 1 to 5, the position in the front-rear direction is regulated by the first regulating surface and the first abutting surface (convex rail and concave groove). Regulating the position in the direction that intersects with this is not limited to the position regulation in the front-rear direction, but can also be applied to the position regulation in the width direction. For example, as shown in FIG. 6, if both side surfaces of the convex rail and both side surfaces of the concave groove are formed so as to intersect the width direction, the width direction of the first and second head members 7, 8 with respect to the support member 9. Can be regulated. In this case, the width direction is the first direction, and the front-rear direction is the second direction.

  In the embodiment shown in FIGS. 1 to 6, the first and second head members 7 and 8 and the support member 9 are all formed separately, and both head members can be attached to and detached from the support member 9 via the positioning mechanism 10. In order to confirm and clean the state of the detection surfaces (light projection surface 4b and light reception surface 5b) of the light projecting unit 4 and the light receiving unit 5, either one of the head members is removed from the support member 9. Since only one head member may be detachable, the other head member may be formed integrally with the support member 9 as long as it can be removed.

  Further, regarding the adjustment of the width of the slit 3, that is, the position adjustment of each head member in the vertical direction (optical axis direction) with respect to the support member 9, the width of the slit 3 can be determined by displacing one of the head members in the vertical direction. Since it can be adjusted, only one head member can be vertically adjusted with respect to the support member 9, and the other head member can be assembled to the support member 9 so that it cannot be displaced vertically.

  Further, in the present invention, since the vertical position adjustment of each head member is not essential, both head members may be assembled to the support member 9 so that they cannot be displaced in the vertical direction. For example, in the case of the embodiment shown in FIGS. 1 to 4, the attachment long hole 97 for the fixing screw 13 a formed in the support member 9 is a long hole. A round hole may be used instead.

  The positioning mechanism 10 is not limited to the configuration of the above embodiment, but may be any other configuration as long as the position of the first and second head members 7 and 8 relative to the support member 9 can be regulated in the front-rear direction and the width direction. May be. For example, as shown in FIG. 7, instead of providing the convex rail 11 and the concave groove 12, the position in the front-rear direction may be regulated by assembling the support member 9 and both head members with knock pins 32, or the support member A plurality of pins formed on one of the head member 9 and both head members may be inserted into holes corresponding to the pins formed on the other and assembled together to restrict the position in the front-rear direction.

  In these cases, the position of the head members in the front-rear direction is regulated by the (knock) pin and the hole, and both head members are attached to the support member 9 and fixed by the fixing member 13 to thereby adjust the positions of the head members in the width direction. The positioning mechanism 10 to be controlled is formed. Instead of the (knock) pin, both head members may be assembled and fixed to the support member 9 using a plurality of reamer bolts.

DESCRIPTION OF SYMBOLS 1 Weft detection apparatus 2 Feeler head 3 Slit 4 Light projection part 4a Optical fiber 4b Light projection surface 5 Light reception part 5a Optical fiber 5b Light reception surface 6 Optical axis 7 First head member 7a Restriction surface 71 Arc-shaped part 72 Slit surface 73 Optical fiber Insertion hole 73a Wiring hole 74 Recess 75 Mounting portion 75a Restriction surface 76 Through hole 8 Second head member 8a Restriction surface 81 Arc portion 82 Slit surface 83 Optical fiber insertion hole 83a Wiring hole 84 Recess 85 Attachment portion 85a Restriction surface 86 Through hole DESCRIPTION OF SYMBOLS 9 Support member 91 Mounting hole 92 Bracket part 93 Fiber extraction part 94 Head member support part 94a Contact surface 94b Contact surface 95 Notch 96 Wiring hole 97 Installation long hole 98 Inner wall 10 Positioning mechanism 11 Convex rail 12 Concave groove 12a Concave groove 12b Concave groove 13 Fixing member 13a Fixing screw 13b Holding washer 13c Nut 14 Fiber cable 14a Connector portion 15 Guide portion 20 Weft 21 Warp 22 Weaving 23 Weft insertion nozzle 24 筬 25 Lead plate 25a Escape hole 26 Entangled yarn 27 Woven fabric 30 Amplifier unit 31 Signal processing circuit 32 Knock pin 111 Convex rail 112 Concave Groove 211 Convex rail 212 Concave groove 311 Convex rail 312 Concave groove

Claims (3)

A feeler head (2) provided with a slit (3) that is provided on the non-feed side and receives a weft (20) that moves in accordance with a beating operation, wherein the feeler head (2) 3) It has a light projecting part (4) and a light receiving part (5) that face each other with the optical axis (6) aligned, and detects the presence or absence of a weft (20) passing through the optical axis (6). In the weft detection device (1) for a water-jet loom that determines the success or failure of the weft insertion,
The feeler head (2) includes a first head member (7) having the light projecting portion (4), a second head member (8) having the light receiving portion (5), the first and first head members. A support member (9) for supporting the two head members (7, 8), and the optical axis (6) of at least one of the first and second head members (7, 8) with respect to the support member (9). ) And a positioning mechanism (10) for regulating the position in the direction orthogonal to
The positioning mechanism (10)
Two first restricting surfaces formed on at least one of the first and second head members (7, 8) so as to face opposite directions, and are perpendicular to the optical axis (6). 1st regulation surface (7a, 8a) formed so as to intersect with the direction of
And two first contact surfaces (94a) formed on the support member (9) so as to contact each of the first restriction surfaces (7a, 8a),
Formed on the first head member (7) and / or the second head member (8) on which the first regulating surfaces (7a, 8a) are formed, and orthogonal to the optical axis (6); Second regulating surfaces (75a, 85a) formed to intersect a second direction different from the first direction
And a second abutting surface (94b) formed on the support member (9) so as to abut on the second regulating surface (75a, 85a),
A fixing member (13) for maintaining a contact state between the second restriction surface (75a, 85a) and the second contact surface (94b);
A weft detection device (1) for a water jet loom characterized by comprising:   The first regulating surface (7a, 8a) and the first contact surface (94a) in the positioning mechanism (10) are formed in parallel to the optical axis (6) in the longitudinal direction, and the first The abutment surface (94a) of the water jet loom according to claim 1, wherein the contact surface (94a) is longer than the first restriction surface (7a, 8a) in the longitudinal dimension. Weft detection device (1). One of the first restriction surfaces (7a, 8a) and the first contact surface (94a) is on both side surfaces of the convex rail (11) formed in parallel with the optical axis (6). Yes,
The other of the first restricting surfaces (7a, 8a) and the first contact surface (94a) is formed in parallel with the optical axis (6) and fitted into the convex rail (11). On both sides of the full concave groove (12),
The fixing member (13) includes at least one of the first head member (7), the second head member (8), and the support member (9) in which the concave groove (12) is formed. It is a member fixed at an arbitrary position on the convex rail (11).
The weft detection device (1) for a water jet loom according to claim 2, characterized in that

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