JP2009263799A - Method for producing flat yarn woven fabric and apparatus for producing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a flat yarn woven fabric, by which the collapse of a weft of flat yarn can be prevented on the insertion of the weft to achieve a satisfactory cover factor, and to provide an apparatus for producing the flat yarn woven fabric. <P>SOLUTION: Provided is the method for producing the flat yarn woven fabric, comprising inserting a weft 27 comprising a flat yarn with a rapier 24 into the opening 22 of warps 12 expanded with a heald 18 to produce the woven fabric, characterized by nipping and holding the end position of the weft and a position on the upstream side of the end position with the first holding portion 36 and the second holding portion 35, moving at least one of the first holding portion and the second holding portion to dispose a portion between both the holding portions at a weft-feeding position 72 crossing the movement route of the rapier, nipping the weft with the third holding portion 55 disposed in the rapier reaching the weft-feeding position, and then inserting the weft into the opening of the warps, while keeping the flat state of the weft. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for producing a flat yarn fabric using a weft yarn made of flat yarn, and more specifically, by inserting the weft yarn into a warp yarn opening while maintaining the flat state of the weft yarn. The present invention relates to a method and an apparatus for producing a flat yarn woven fabric that can produce a flat yarn woven fabric exhibiting excellent properties as a reinforced composite material.

  Carbon fiber fabrics are usually woven by shuttle looms or rapier looms. Especially, carbon fiber fabrics use thick weft yarns, so the shuttle has a short yarn length that can be wound on weft tubes, and the tube must be replaced frequently. There is. Rapier looms are often used because they can be unwound directly from the bobbin and the pipes are not frequently changed like shuttle looms.

  Although not limited to carbon fiber fabrics, if the weaving machine rotation speed is the same, the smaller the weft density, the higher the productivity, leading to cost reduction. However, when a carbon fiber reinforced plastic is molded from a carbon fiber fabric having a low weft density, the following problems occur.

  A carbon fiber yarn having a relatively small fineness is used for the warp yarn and the weft yarn, and a fabric woven with a low weaving density is a fabric in which a gap is generated between the weaving yarns. When formed into carbon fiber reinforced plastic with such a woven fabric, the gap portion becomes resin-rich, and when stress acts on the carbon fiber-reinforced plastic, breakage progresses from the resin-rich portion, resulting in a high strength. The problem is a low carbon fiber reinforced plastic.

  On the other hand, fabrics using carbon fiber yarns with high fineness for warp yarns and weft yarns inevitably have low weaving density and high productivity, but carbon fiber yarns with high fineness are interwoven between warp yarns and weft yarns. The crimp becomes larger. When stress acts on a carbon fiber reinforced plastic based on such a woven fabric, the stress concentrates on the crimp portion of the weaving yarn, and that portion serves as a starting point for destruction and fully exhibits the high strength characteristics of the carbon fiber. The problem is that you can't.

On the other hand, the carbon fiber flat yarn woven fabric proposed in Patent Document 1 below is woven at a low weaving density even if the carbon fiber yarn has a high fineness, which leads to cost reduction. In addition, since the weaving yarn is flat and has a large yarn width, there is no gap between the weaving yarns, and at the intersection of the warp and weft yarns, the thin flat weaving yarns are interlaced, so the weaving yarn is extremely crimped. It is a very small textile substrate. Therefore, even if it is molded into a carbon fiber reinforced plastic, it has a characteristic of exhibiting high strength characteristics.
JP-A-11-012895

  Although it is a carbon fiber flat yarn woven fabric that exhibits excellent characteristics as described above, there are the following problems when weaving actually, and improvements are desired.

  That is, various methods are adopted by the loom manufacturer for the weft insertion method in the rapier loom, but the one-side rapier loom is frequently used in order to stably insert the flat shape of the carbon fiber flat yarn.

  The normal weft yarn feeding method in the one-side rapier loom will be described. When the heel is moved before weaving due to the hitting of the already inserted weft yarn, the weft yarn end gripping position is fixed before weaving on the weft yarn feeding side. When the weft end is gripped by the tool, the cutter acts between the weft end gripping tool and the ear of the fabric almost simultaneously to cut the weft.

  Next, as the kite moves backward, the weft yarn feeding guide moves backward or rises and waits for the next weft yarn feeding. Next, the rapier is inserted into the warp yarn opening, and the weft yarn is fed to the hook portion of the rapier tip by the movement of the weft yarn feed guide just before or at the same time when the rapier tip reaches the yarn feeding position.

  By the way, the weft yarn feeding guide is usually a circular hole guide in order to reliably feed the yarn. However, for example, when a carbon fiber flat yarn whose shape is maintained with a slight sizing agent is used as the weft yarn, the weft yarn is bent by the yarn feeding movement of the guide. Further, since the weft thread passes through the circular hole of the guide when the weft thread is inserted, the flat thread is rubbed by the circular hole, and the flat shape is crushed and inserted in a round cross-sectional shape. The fabric thus obtained has a problem that the gap between the weaving yarns is large and becomes a so-called mesh shape, which becomes a base material unsuitable as a reinforcing fabric.

  Therefore, in order to solve the above problems, the present inventors do not use the weft yarn feeding guide having a circular hole, but the weft yarn is inserted in a free state and is gripped by the weft yarn feeding guide when the insertion is completed. A method of feeding the weft yarn by moving at the time of feeding the rapier was examined. According to this method, the flat shape was not crushed by rubbing with a circular hole guide when the weft thread was inserted.

  However, when the weft yarn feeding guide performs the yarn feeding movement to the rapier, the flat weft yarn is gripped by the weft yarn feeding guide and the weft yarn end gripper at a close distance, and in the plane direction of the flat surface (yarn width direction). It was found that the yarn was fed to the rapier in a state where the flat shape was crushed and the yarn width was converged because it was bent.

  When the weft yarn is inserted in such a state, the flat yarn near the rapier gripping portion also exerts an inward force on the fibers on both ends of the flat yarn due to the tension at the time of insertion. The problem was that the yarn width converged over a length of 50 cm, resulting in a non-uniform woven fabric in which the fabric end opposite to the weft yarn feeding side was open.

  In addition, carbon fiber flat yarns are often fixed with a slight sizing agent as described above in order to improve resin impregnation when used as a reinforcing material, and are woven while maintaining the flat shape. Development of technology for obtaining a flat yarn woven fabric having a satisfactory cover factor is desired. Here, the cover factor is the ratio of the area covered by the fibers of the woven yarn to the area of the plane when the fabric is viewed in a plane.

  Accordingly, an object of the present invention is to provide a method and an apparatus for producing a flat yarn fabric that solves the problems of the prior art described above, prevents the flat yarn from being crushed when the weft is inserted, and achieves a satisfactory cover factor. There is to do.

  In order to achieve the above object, a method for producing a flat yarn fabric according to the present invention is a method for producing a flat yarn fabric, in which a weft yarn made of flat yarn is inserted by a rapier into an opening of a warp spread by a heald. The weft yarn end and two upstream portions thereof are sandwiched and held by a first gripping portion and a second gripping portion comprising a pair of freely rotatable discs, respectively, and at least of the first gripping portion and the second gripping portion One gripping part is moved and a portion between both gripping parts is arranged at a yarn feeding position intersecting with the advance / retreat path of the rapier, and the third gripping part provided on the rapier that reaches the yarn feeding position The weft thread is sandwiched and inserted into the warp thread opening while maintaining the flat state of the weft thread.

  According to the method for producing a flat yarn fabric of the present invention, the yarn end of the weft yarn and the two upstream portions thereof are sandwiched and held by the first gripping portion and the second gripping portion each consisting of a pair of rotatable rotating disks, Since at least one gripping part of the first gripping part and the second gripping part is moved and the portion between the two gripping parts is arranged at the yarn feeding position intersecting with the advance / retreat path of the rapier, the weft yarn made of flat yarn Can be sandwiched in a flat state, and at the time of moving at least one gripping portion and placing the portion between both gripping portions at the yarn feeding position intersecting the rapier advance / retreat path, Rotation of the weft yarn made of flat yarn is prevented from twisting. Accordingly, the weft thread is inserted into the warp thread opening with the weft thread sandwiched by the third gripping portion provided on the rapier, and the weft thread is inserted into the warp thread in a flat state. A yarn fabric can be obtained.

  In the method for producing a flat yarn fabric of the present invention, the third gripping portion provided on the rapier has a fixing plate and a sandwiching plate, and the weft thread is fixed to the fixing plate in a state where the sandwiching plate is opened with respect to the fixing plate. When the rapier is once passed between the sandwich plates and the rapier returns, it is preferable that the sandwich plate is closed with respect to the fixed plate and the weft thread is sandwiched between the fixed plate and the sandwich plate. According to this, the weft yarn held flat in the first gripping part and the second gripping part passes between them without being rubbed against the fixing plate and the sandwiching plate of the third gripping part provided on the rapier, When the rapier returns, it is gripped in a flat state between the fixing plate and the sandwiching plate of the third gripping portion, so that the flat shape is not crushed, and the flat state of the weft yarn when inserted into the warp yarn opening is further increased It can be held well.

  In addition, according to the conventional yarn feeding method to the rapier, the weft yarn is moved along the outer surface of the hooking claw provided at the tip of the rapier, dropped into the inside of the hooking claw, and the rapier is inverted, thereby turning the weft yarn. Is inserted into a wedge-shaped gap made up of a claw and a presser to be gripped. However, in the conventional yarn feeding method, the weft yarn is fed while being in contact with the tip of the rapier, the hook claw, etc., and there are problems that the flat state is disturbed and the yarn width converges. In addition, even in the case of gripping the weft thread, the mechanism is such that the weft thread is pushed and held by the wedge-shaped gap formed in the hook part, so that the flat thread or the like easily converges at the hook part and the flat state is crushed. there were. Furthermore, the weft thread opens a wedge-shaped gap after insertion, and the weft thread grip is released, but the weft thread end is released while being rubbed by the hook of the hook, so that the thread width at the thread end is further converged. was there.

  In the method for producing a flat yarn fabric of the present invention, it is preferable that the opening / closing operation of the sandwiching plate of the third gripping portion of the rapier is performed in conjunction with a rotating cam synchronized with the loom rotation. According to this, the opening and closing operation of the sandwiching plate of the third gripping portion of the rapier can be performed silently with almost no impact, and the life of the rapier can be prolonged.

  In the conventional rapier, the actuating lever is operated while sliding on the working surface of the cam fixed to the loom according to the reciprocating motion of the rapier. Therefore, the actuating lever provided on the rapier is instantaneously separated from the cam. Since the sandwich plate is closed, the impact is intense, and there is a problem that not only the noise but also the rapier is destroyed.

  Furthermore, in the method for producing a flat yarn fabric of the present invention, the weft yarn is preferably a flat yarn made of carbon fiber. According to this, a flat yarn woven fabric that exhibits excellent properties as a fiber-reinforced composite material can be provided.

  On the other hand, the flat yarn fabric manufacturing apparatus of the present invention includes a first gripping portion and a second gripping portion for gripping a weft end of a flat yarn and two upstream positions thereof, and an opening of a warp yarn spread by a heald. A flat yarn fabric comprising a rapier provided with a third gripping portion that moves forward and backward inward and grips the weft yarn held between the first gripping portion and the second gripping portion and inserts the weft yarn into the warp yarn opening. In the manufacturing apparatus, the first gripping portion and the second gripping portion include a pair of freely rotatable turntables that can be opened and closed.

  According to the flat yarn fabric manufacturing apparatus of the present invention, the weft yarn made of flat yarn is obtained by holding the yarn end of the flat yarn made of flat yarn and the two upstream portions thereof by the first holding portion and the second holding portion, respectively. The rotatable rotating disk rotates when it can be sandwiched in a flat state and at least one gripping part is moved and the part between both gripping parts is placed at the yarn feeding position intersecting the rapier advance / retreat path. Thus, twisting of the weft yarn made of flat yarn is prevented. Accordingly, the weft thread is inserted into the warp thread opening with the weft thread sandwiched by the third gripping portion provided on the rapier, and the weft thread is inserted into the warp thread in a flat state. A yarn fabric can be obtained.

  In the flat yarn fabric manufacturing apparatus of the present invention, the third gripping portion provided on the rapier has a fixed plate and a sandwich plate that can be opened and closed with respect to the fixed plate, and the sandwich plate is disposed on the fixed plate. In the open state, the weft thread is temporarily passed between the fixing plate and the sandwiching plate, and when the rapier returns, the sandwiching plate is closed with respect to the fixing plate, and the weft thread is sandwiched between the fixing plate and the sandwiching plate. Preferably it is. According to this, the weft yarn composed of the flat yarn held by the first gripping portion and the second gripping portion can be gripped in the flat state by the third gripping portion provided on the rapier, so it is inserted into the warp yarn opening. The flat state of the weft yarn when doing so can be kept even better.

  Moreover, it is preferable that the opening / closing mechanism of the sandwiching plate of the third gripping portion of the rapier is a mechanism that interlocks with a rotating cam that synchronizes with the loom rotation. According to this, as described above, the opening and closing operation of the sandwich plate of the third gripping portion of the rapier can be performed quietly with almost no impact, and the life of the rapier can be prolonged.

  According to the present invention, the weft end of the weft yarn made of flat yarn and the two upstream portions thereof are sandwiched and held by the first gripping portion and the second gripping portion made of a pair of rotatable rotating discs, respectively. The weft yarn made of yarn can be pinched in a flat state and can be rotated when moving at least one gripping part and placing the part between the two gripping parts at the yarn feeding position intersecting the rapier advance / retreat path The twisting disc is prevented from rotating and the weft yarn made of flat yarn is prevented from being twisted, and the weft yarn is sandwiched between the third gripping portions provided on the rapier and inserted into the warp yarn opening in a flat state. A high flat yarn fabric can be obtained. Therefore, the weft yarn can be inserted without crushing the flat state of the weft yarn, and the reinforcing fabric with very thin and uniform fiber dispersion can be stably obtained using the carbon fiber flat yarn having a high fineness.

  Examples of the yarn type used in the present invention include reinforcing fibers such as glass fibers, aramid fibers, and carbon fibers. Among them, carbon fibers having a high specific strength and specific elastic modulus are preferable.

  In the present invention, it is preferable that at least the weft yarn is a flat yarn in which single fibers are gathered in a flat shape, and the warp yarn is also a flat yarn. By using a flat yarn for the weaving yarn, it is possible to obtain a woven fabric which is thin with a high fineness and has a uniform fiber distribution in the woven fabric, which is inexpensive in production cost, and a useful and inexpensive base material as a reinforcing woven fabric. Can be provided.

  In the case where the woven yarn is carbon fiber, the above-described effect is further exhibited by using a yarn having a fineness of 6000 or more single fibers. However, when trying to obtain a thin woven fabric with carbon fiber yarns having too many single fibers, there is a problem that the yarn width of the flat yarn becomes very large and weaving becomes difficult, and the preferred range is 6000 to 48000. . Moreover, as a thread | yarn width of a flat thread, although related to the fineness to be used, it is preferable that it is 5-15 mm width.

  Moreover, as a method of keeping the cross-sectional shape of the carbon fiber flat, it is preferable to attach 0.5 to 2% by weight of a sizing agent mainly composed of an epoxy resin not containing a curing agent. From the standpoint of shape retention, it is preferable to attach a large amount of the sizing agent. However, if a large amount of the sizing agent is adhered, it will fall off during weaving, and the sizing agent will adhere to the guides. 0.5 to 2% is a preferable range.

  In the present invention, the weaving method of the flat yarn woven fabric is not particularly limited, and for example, plain weaving, twill weaving, satin weaving, etc. can be adopted, and plain weaving is particularly preferable.

  Next, with reference to the drawings, an embodiment of a flat yarn fabric manufacturing apparatus of the present invention will be described.

  As shown in FIG. 1, the flat yarn fabric manufacturing apparatus 10 includes a plurality of warp bobbins 11 installed on a creel table (not shown), and warp yarns 12 are drawn from the warp bobbins 11. The warp yarn 12 is not particularly limited, but is preferably a flat yarn.

  On the downstream side of the warp bobbin 11 in the running direction of the warp yarn 12, a rear heel 13 is first arranged. Further, a plurality of tension rolls 14 are arranged on the downstream side, and an appropriate tension is applied to the traveling warp yarn 12.

  Further, on the downstream side, a first heald frame 16 and a second heald frame 17 are arranged via a middle bar 15. Each heald frame 16, 17 has a heald 18 through which the warp thread 12 passes, and the heald 18 of the first heald frame 16 and the heald 18 of the second heald frame 17 are arranged so as to be shifted by a half pitch in the width direction. The parallel warp yarns 12 are alternately inserted into the heald 18 of the first heald frame 16 and the heald 18 of the second heald frame 17.

  The first heald frame 16 and the second heald frame 17 are connected to the heald frame drive mechanism 19 via wires 20, respectively. The wire 20 is connected to the drive unit of the heald frame drive mechanism 19 via the pulley 21, and the operation of the heald frame drive mechanism 19 causes the first heald frame 16 and the second heald frame 17 to respectively move at predetermined timings. It moves up and down in opposite directions. That is, when the first heald frame 16 is raised, the second heald frame 17 is lowered, and when the first heald frame 16 is lowered, the second heald frame 17 is raised. As a result, the warp yarns 12 passed through the healds 18 of the respective heald frames 16 and 17 are alternately opened up and down along the parallel direction, and warp yarn openings 22 are formed between the warp yarns 12.

  On the further downstream side of the second heald frame 17, a forehead 23 is arranged, and the forehead 23 is moved back and forth by a drive mechanism (not shown) to beat the weft thread 27 inserted into the warp thread opening 22. Thus, it is packed forward (in the direction of the produced flat yarn fabric).

  A rapier 24 for inserting the weft thread 27 into the warp thread opening 22 is disposed on the downstream side of the front kite 23 so as to be able to advance and retreat so as to intersect the traveling direction of the warp thread 12. The structure of the rapier 24 will be described in more detail later. Further, a cutter 25 for cutting the inserted weft thread 27 is disposed on the downstream side of the rapier 24.

  Next, a description will be given along the traveling path of the weft thread 27. The weft thread 27 is pulled out from the weft thread bobbin 26 and introduced into the feed roller 29 through the first guide roller group 28. The feed roller 29 includes a driving roller 30 and a nip roller 31, and feeds the weft 27 at a predetermined speed in the traveling direction.

  A pooling pipe 32 is disposed on the downstream side of the feed roller 29, and the inside of the pooling pipe 32 is sucked by the blower 33, and the weft thread 27 is drawn into the pooling pipe 32 to give an appropriate tension to the weft thread 27. Storing the yarn length necessary for weft insertion.

  On the downstream side of the pooling pipe 32, a second gripping part 35 and a first gripping part 36 are sequentially arranged via a second roller group 34. The first gripping part 36 grips the end of the weft thread 27 so that it can be opened and closed, and the second gripping part 35 grips the upstream side so that it can be opened and closed. A portion between the portion 35 and the portion 35 is arranged at a yarn feeding position 72 described later.

  Next, the support opening / closing structure of the second gripping portion 35 will be described with reference to FIGS. A guide rod 37 is extended to one side of the front rod 23, and a slide block 38 is slidably mounted on the guide rod 37. On the other hand, a connecting arm 40 is attached to the device frame 39, and a base end of a link 41 is pivotally attached to the connecting arm 40. The tip of the link 41 is pivotally attached to the slide block 38, and as shown in FIG. 2B, when the front bar 23 moves back and forth, the slide block 38 has a turning radius determined by the link 41. It moves back and forth while sliding along the guide bar 37. Note that the first gripping portion 36 is disposed in the vicinity of the pivot attachment portion of the link 41 to the connecting arm 40, and the second gripping portion 35 attached to the slide block 38 in a manner described later is a first gripping portion. In a state where the distance to the portion 36 is kept substantially constant, the front / rear movement of the front rod 23 is moved back and forth.

  A connecting plate 42 is attached to the lower part of the slide block 38, and a pair of support shafts 43 extend in parallel on the lower surface of the connecting plate 42. A spring 44 is attached to the outer periphery of the support shaft 43, and the lower end portion of the support shaft 43 passes through the slide plate 45 and is connected to the fixed plate 46. Accordingly, the slide plate 45 is always urged downward by the spring 44 toward the fixed plate 46.

  A guide tube 47 inserted through the slide block 38 is attached to the connecting plate 42, and a wire 48 is inserted into the guide tube 47. The distal end of the wire 48 passes through the connecting plate 42 and is connected to the slide plate 45. The base end of the wire 48 is connected to a drive mechanism (not shown). When the wire 48 is pulled by the drive mechanism, the slide plate 45 rises against the urging force of the spring 44 and is indicated by an arrow in FIG. Thus, it is configured to move up and down.

  A rotating plate 50 is mounted on the slide plate 49 and the fixed plate 46 via a support shaft 49, and the pair of upper and lower rotating plates 50 are opened and closed by the vertical movement of the slide plate 49. The rotary disk 50 is preferably a disk and is not shown in the figure, but is free to rotate with a relatively light force via a thrust bearing or the like.

  The first gripping portion 36 is fixedly disposed in the vicinity of the pivotally attached portion of the link 41 to the connecting arm 40, and is a pair of rotating disks that can be opened and closed by a drive mechanism similar to the second gripping portion 35. 50.

  Next, the structure of the rapier 24 will be described with reference to FIGS. The rapier 24 has a main body frame 51 having a long shape, and the main body frame 51 is formed on the downstream side of the forehead 23 by a driving mechanism (not shown) of the warp yarn 12 at a portion where the warp yarn opening 22 is formed. It is mounted so as to advance and retract in a direction substantially perpendicular to the traveling direction. A fixing plate 52 is attached to the distal end portion of the main body frame 51, and the distal end portion 52 a of the fixing plate 52 is slightly curved outward so that when the rapier 24 moves forward, the weft thread 27 is attached to the fixing plate 52. It can be introduced inside.

  On the inner side of the front end portion of the main body frame 51, a sandwich plate 54 supported by a rotation support shaft 53 is disposed so as to face the fixed plate 52. And the 3rd holding part 55 in this invention is comprised by the fixed board 52 and the pinching board 54. FIG. The pinch plate 54 rotates as indicated by the solid line and the imaginary line in FIG. 4C by the rotation of the rotation support shaft 53, and the weft thread 27 is pinched between the fixed plate 52. The holding surface 54a of the sandwiching plate 54 has a smooth curved surface, and in contact with the fixed plate 52, a slight gap 56 is formed around the holding surface 54a. In the insertion operation into the weft 22, the weft thread 27 is sandwiched between the fixing plate 52 and the sandwiching plate 54 through the gap 56 in a flat state.

  The rotating support shaft 53 that supports the sandwiching plate 54 is rotated so that the pressing surface 54 a of the sandwiching plate 54 is always pressed against the fixed plate 52 by a spring 57 built in the proximal end portion of the main body frame 51. It is energized.

  Further, as shown in FIG. 5, a lever 58 is attached to the proximal end portion of the rotation support shaft 53. In relation to the lever 58, the apparatus frame is provided with a rotating arm 59 whose base end portion is rotatably supported by a fulcrum 60, and the lever 58 is provided at a distal end portion of the rotating arm 59. A pusher plate 61 that is in contact with and away from is attached. A base end of a support shaft 63 is pivotally attached to an intermediate portion of the rotation arm 59 via a connecting shaft 62. A tension coil spring 65 is interposed between the support shaft 63 and the apparatus frame 64, and the tension coil spring 65 constantly urges the support shaft 63 and the rotating arm 59 upward (in a direction away from the lever 58). .

  Further, a frame body 66 is connected to the distal end portion (lower end portion) of the support shaft 63, and a long hole 66 a extending vertically is formed in the frame body 66. A rotating shaft 68 that rotates in synchronization with a loom rotating mechanism (not shown) is inserted into the long hole 66a, and a rotating cam 69 is attached to the rotating shaft 68. The rotating cam 69 has a substantially disk shape, and a protrusion 70 is formed at one location on the outer periphery thereof. In addition, a cam follower 67 that is in contact with the outer periphery of the rotating cam 69 is attached to the frame 66.

  Therefore, when the rotating shaft 68 and the rotating cam 69 rotate in synchronization with the loom rotating mechanism (not shown), the protrusion 70 of the rotating cam 69 pushes down the cam follower 67 downward each time the rotating cam 69 makes one round, and the tension coil spring 65 The frame 66, the support shaft 63 and the rotating arm 59 are pushed downward against the urging force. As a result, the pusher plate 61 attached to the tip of the rotating arm 59 pushes the lever 58 and rotates the rotation support shaft 53 against the urging force of the spring 57 (see FIG. 4A). As shown in (c), the sandwiching plate 54 is opened with respect to the fixed plate 52. The opening / closing operation of the sandwich plate 54 with respect to the fixed plate 52 is performed in synchronization with the advance / retreat operation of the rapier 24 described later.

  Next, an embodiment of a method for producing a flat yarn fabric according to the present invention using the flat yarn fabric production apparatus 10 will be described with reference to FIGS.

  FIG. 6 shows a state in which the weft thread 27 is inserted into the warp thread opening 22 by the rapier 24, the front collar 23 is moved forward, and the inserted weft thread 27 is packed forward. At this time, as shown in FIG. 5B, the first gripping portion 36 and the second gripping portion 35 are arranged on the line of the weft thread 27, and the respective rotary discs 50 are in an open state. Passes between the rotary plates 50. Further, the cutter 25 is disposed adjacent to the first grip portion 36. The warp yarn 12 is wound around a winding roll 71.

  In the above state, as shown in FIG. 7, the rotary plates 50 of the first gripping portion 36 and the second gripping portion 35 are closed, and the cutter 25 cuts the weft thread 27 on the side of the first gripping portion 36. As a result, the first gripping portion 36 holds the yarn end of the weft thread 27 and the second gripping portion 35 holds the upstream side thereof. The weft 27 made of a flat yarn is arranged with its flat surface directed in the vertical direction, and the rotating disk 50 of each gripping portion 36, 35 grips the weft 27 from the vertical direction in a flat state.

  Next, as shown in FIG. 8, the front collar 23 moves rearward, and the second gripping portion 35 also moves rearward, and is held by the first gripping portion 36 and the second gripping portion 35 of the weft thread 27. This portion is inclined and arranged at the yarn feeding position 72 with respect to the rapier 24. At this time, as shown in FIG. 2 (b), the slide block 38 moves back and forth while sliding along the guide rod 37 at a rotation radius determined by the link 41, whereby the second gripping portion 35 is In a state where the distance to the first gripping portion 36 is kept substantially constant, the front grip 23 moves back and forth with the back and forth movement. As a result, it is possible to prevent the portion of the weft thread 27 held by the first gripping portion 36 and the second gripping portion 35 from being pulled or sagging.

  Further, during the movement of the second gripping portion 35, the weft thread 27 receives a rotational torsional force along the plane direction at the gripping portions of the first gripping portion 36 and the second gripping portion 36. Since the gripping portions 36 and 35 grip the weft thread 27 by the rotating disk 50, the weft thread 27 is prevented from being twisted and thinned by the rotation of the rotating disk 50. This can be easily understood by considering a paper tape instead of a flat yarn, for example. In other words, if you hold both ends of the paper tape strongly with your fingertips and rotate one of them in a direction parallel to the surface of the paper tape, the paper tape will twist and become thin while wavy. It rotates at the point of contact with the fingertip, and can be rotated without twisting the paper tape.

  Next, as shown in FIG. 9, the rapier 24 moves forward and is inserted into the warp yarn opening 22. At this time, the protrusion 70 of the rotating cam 69 shown in FIG. 5 pushes down the cam follower 67 and the pusher plate 61 pushes the lever 58, so that the rotating support shaft 53 rotates, as shown in FIG. The sandwiching plate 54 is separated from the fixed plate 52, and a gap is formed between them. As a result, as shown in FIG. 9B, the weft thread 27 is guided by the tip portion 52 a curved outward of the fixing plate 52 and passes between the sandwiching plate 54 and the fixing plate 52.

  Next, as shown in FIG. 10, the rapier 24 starts to retract. At this time, the protrusion 70 of the rotating cam 69 shown in FIG. 5 passes over the cam follower 67 and the pusher plate 61 is separated from the lever 58, so that the sandwiching plate 54 is moved by the urging force of the spring 57 shown in FIG. As shown by an imaginary line in FIG. As a result, the weft thread 27 arranged at the yarn feeding position 72 is sandwiched between the sandwiching plate 54 and the fixing plate 52 through the gap 56. Since this pinching is made elastically by the urging force of the spring 57 between the surfaces of the pinching plate 54 and the fixing plate 52, the weft 27 can be held in a flat state. Thus, the third gripping portion 55 of the rapier 24 grips the weft thread 27.

  Next, as shown in FIG. 11, the turntables 50 of the first gripping portion 36 and the second gripping portion 35 are opened, and the rapier 24 is retracted while pulling the weft thread 27, and is gripped by the third gripping portion 55 of the rapier 24. A weft thread 27 is inserted into the warp thread opening 22. Then, the front heel 23 moves forward again and strikes the inserted weft 27 to return to the state shown in FIG.

  By repeating the above operation, the warp yarns 12 are alternately opened up and down alternately with the vertical movements of the heald frames 16 and 17, and the warp yarn openings 22 are inserted into the warp yarn openings 22 each time. As shown in FIG. 12, a flat yarn fabric 73 can be formed. The flat yarn fabric 73 formed in this way is taken up by a take-up roll 71.

  FIG. 13 shows an external view of the flat yarn fabric 73 formed in this way. In this embodiment, the warp yarn 12 and the weft yarn 27 are plain woven. A gap 74 may be formed between the warp yarn 12 and the weft yarn 27. According to the present invention, the weft yarn 27 reaches the end portion gripped by the third gripping portion 55 of the rapier 24. Since it is inserted in the flat state, the gap 74 can be made as small as possible to improve the cover factor. In the present invention, the cover factor can be determined by the following measurement method.

  That is, three samples having a width of 20 cm and a length of 25 cm were taken from the fabric in an approximately uniform position in the width direction of the fabric, and the sample was enlarged to 200% by a copying machine, and averaged from the interval of 15 warp yarns and weft yarns. An average yarn width (Wwarp, Wweft) obtained by measuring the yarn interval (Lwarp, Lweft) and the respective yarn widths with a caliper to the first decimal place can be obtained, and the following formula can be obtained from these values.

  In order to clarify the effect of the present invention, the first gripping portion and the second gripping portion are configured by a mechanism that simply clamps the weft thread, and the third gripping portion of the rapier uses a conventional apparatus in which the weft thread is hooked by a hook. The cover factor was calculated | required according to the said measuring method about the manufactured flat yarn fabric and the flat yarn fabric manufactured using the apparatus of this invention shown by the said embodiment. The results are shown in Table 1 below.

  As is apparent from Table 1, the cover factor of the fabric by the conventional apparatus is not much different from the fabric according to the present invention from the yarn feeding side portion to the center portion in the fabric width direction, but the cover factor on the side opposite to the weft yarn feeding side is very large. There is a problem that it is low. On the other hand, the cover factor of the fabric according to the present invention is uniform in the fabric width direction.

It is a schematic perspective view which shows one Embodiment of the manufacturing apparatus of the flat yarn fabric by this invention. The 2nd holding part in the manufacturing apparatus is shown, (a) is a schematic perspective view, (b) is explanatory drawing which shows the moving mechanism. It is explanatory drawing which shows the drive mechanism of the 2nd holding part in the manufacturing apparatus. The rapier in the manufacturing apparatus is shown, (a) is an overall explanatory view, (b) is an enlarged explanatory view of a tip portion, and (c) is a cross-sectional view taken along the CC arrow line of (b). It is an isometric view explanatory drawing which shows the opening / closing drive mechanism of the 3rd holding part of the rapier. Using the same manufacturing apparatus, a rapier inserts a weft thread into the warp thread opening, moves the front wing forward, and strikes the inserted weft thread, (a) is an overall explanatory view, and (b) is a necessary illustration. FIG. 6 shows a state in which the weft thread is held by the first gripping portion and the second gripping portion from the state of FIG. 7 shows a state in which the second gripping portion is moved from the state of FIG. 7 and the weft yarn is arranged at the yarn feeding position. 8 shows a state in which the rapier is advanced from the state of FIG. 8 and inserted into the warp yarn opening, (a) is an overall explanatory view, and (b) is a main part explanatory view. FIG. 9 shows a state in which the rapier is further advanced and then retracted to hold the weft yarn from the state of FIG. 9, (a) is an overall explanatory view, and (b) is a main part explanatory view. FIG. 11 is an overall explanatory view showing a state in which the rapier is retracted from the state of FIG. 10 and a weft thread is inserted into the warp opening. It is a whole explanatory drawing which shows the state which manufactured the flat woven fabric by repeating operation of FIGS. The external appearance of the manufactured flat yarn textiles is shown, (a) is a general view, (b) is a partial enlarged view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Flat yarn fabric manufacturing apparatus 11 Warp bobbin 12 Warp 13 Back rod 14 Tension roll 15 Middle bar 16 First heald frame 17 Second heald frame 18 Held 19 Held frame drive mechanism 20 Wire 21 Pulley 22 Warp yarn opening 23 Fork 24 Rapier 25 Cutter 26 Weft thread bobbin 27 Weft thread 28 First guide roller group 29 Feed roller 30 Driving roller 31 Nip roller 32 Pooling pipe 33 Blower 34 Second guide roller group 35 Second gripping part 36 First gripping part 37 Guide bar 38 Slide block 39 Device frame 40 connecting arm 41 link 42 connecting plate 43 support shaft 44 spring 45 slide plate 46 fixing plate 47 guide tube 48 wire 49 support shaft 50 rotating plate 51 main body frame 52 fixing plate 53 rotating support shaft 54 sandwiching plate 54a Presser surface 55 Third gripping portion 56 Clearance 57 Spring 58 Lever 59 Rotating arm 60 Support point 61 Pusher plate 62 Connection shaft 63 Support shaft 64 Device frame 65 Tension coil spring 66 Frame body 67 Cam follower 68 Rotating shaft 69 Rotating cam 70 Projection 71 Winding Roll 72 Yarn feeding device 73 Flat yarn fabric 74 Crevice

Claims (7)

  In a method of manufacturing a flat woven fabric in which a weft made of flat yarn is inserted by a rapier into a warp yarn opening spread by a heald, a pair of freely rotatable yarn ends of the weft yarn and two locations upstream thereof The first gripping part and the second gripping part made of a rotating table are sandwiched and held respectively, and at least one gripping part of the first gripping part and the second gripping part is moved so that the part between the gripping parts is Arranged at the yarn feeding position intersecting with the advance / retreat path of the rapier, the weft yarn is sandwiched by a third gripping portion provided on the rapier that has reached the yarn feeding position, and the flat state of the weft yarn is maintained, while being in the warp yarn opening A method for producing a flat yarn woven fabric, characterized by being inserted.   The third gripping portion provided on the rapier has a fixing plate and a sandwiching plate, and with the sandwiching plate opened with respect to the fixing plate, the weft thread is once passed between the fixing plate and the sandwiching plate, and the rapier returns. The method for producing a flat yarn fabric according to claim 1, wherein the sandwiching plate is closed with respect to the fixing plate, and the weft yarn is sandwiched between the fixing plate and the sandwiching plate.   The method for producing a flat yarn fabric according to claim 1 or 2, wherein the opening and closing operation of the sandwiching plate of the third gripping portion of the rapier is performed in conjunction with a rotation cam synchronized with the loom rotation.   The method for producing a flat yarn fabric according to any one of claims 1 to 3, wherein the weft yarn is a flat yarn made of carbon fiber.   The first gripping portion and the second gripping portion for gripping the end of the weft yarn made of flat yarn and the two upstream positions thereof respectively, and the first gripping portion and the second gripping portion are moved forward and backward in the warp opening widened by the heald. In a flat yarn fabric manufacturing apparatus comprising a rapier provided with a third gripping portion for gripping and inserting a weft held between two gripping portions into an opening of a warp yarn, the first gripping portion and the first gripping portion 2. An apparatus for producing a flat yarn fabric, wherein the gripping part is composed of a pair of rotatable turntables that can be opened and closed.   The third gripping portion provided on the rapier has a fixed plate and a sandwich plate that can be opened and closed with respect to the fixed plate, and sandwiches the weft thread with the fixed plate in a state where the sandwich plate is opened with respect to the fixed plate. 6. The structure according to claim 5, wherein when the rapier is once passed between the plates and the rapier returns, the pinch plate is closed with respect to the fixed plate and the weft thread is pinched between the fixed plate and the pinch plate. Flat yarn fabric manufacturing equipment.   The flat yarn fabric manufacturing apparatus according to claim 6, wherein the opening / closing mechanism of the sandwiching plate of the third gripping portion of the rapier is a mechanism interlocked with a rotary cam synchronized with the loom rotation.

Images