JPH10317252A - Flat yarn supply method and apparatus and woven fabric manufacturing method and apparatus - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To unwind a flat yarn without crushing the flat state, and stably produce a thin flat yarn woven fabric. SOLUTION: A flat yarn composed of multifilaments having a yarn width / yarn thickness ratio in the range of 30 to 150 is wound with a winding number of 3
A method for supplying a flat yarn, wherein the flat yarn is unwound while contacting a touch roller with a package formed on the bobbin when the flat yarn is traversed and unwound from a bobbin wound at / 100 mm or less. An apparatus, and a method and apparatus for manufacturing the flat yarn fabric.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for supplying a flat yarn which exhibits excellent properties when used in a fiber-reinforced composite material, and a method and an apparatus for manufacturing a flat yarn woven fabric using the flat yarn. More specifically, a flat yarn is wound and unwound from a bobbin wound with a flat yarn made of a carbon fiber multifilament or the like and supplied as a weft yarn and / or a warp yarn to stably produce a thin woven fabric having a uniform fiber density. Method and apparatus.

[0002]

2. Description of the Related Art Reinforcing fiber woven fabrics, for example, carbon fiber woven fabrics, are usually woven by a general shuttle loom or rapier loom, and are frequently used as a reinforcing base material for composite materials. Since a normal carbon fiber woven fabric is made of carbon fiber yarns converged into a substantially circular cross section, in a woven state, the cross section is elliptical, and the yarn orthogonal to the yarn is greatly crimped. For this reason, there is a drawback that the high strength characteristic which is a characteristic of carbon fiber cannot be sufficiently exhibited, and a plastic having a high carbon fiber content cannot be obtained because of a large void.

[0003] In order to cope with such a drawback, if a thin and wide flat carbon fiber yarn is directly used as a woven fabric, the crimp of the woven yarn is reduced, so that a high reinforcing effect can be obtained and the carbon fiber content is high. Plastic is obtained. A method of weaving a carbon fiber woven fabric using such flat carbon fiber yarns includes a warp beam in which a required number of carbon fiber yarns are wound,
Alternatively, a warp sheet supplied from a carbon fiber yarn bobbin hung on a creel is sequentially opened by a heald, and weft yarn is inserted into the opening by a shuttle or rapier.

[0004] As for the warp yarn, there is a method of supplying the beam directly from the bobbin or a beam supply method. In either case, the carbon fiber yarn bobbin is unwound while being slowly rotated or unwound in the axial direction of the bobbin. There are two methods of unwinding. Also, regarding weft,
Since the feeding speed is much higher than that of the warp yarn, a method of unwinding and unwinding from a fiber yarn bobbin is usually adopted. On the other hand, Japanese Patent Laid-Open No. 2-74645 discloses a method in which the weft is unwound so that the flat yarn is not twisted. A method of storing a long length has been proposed.

When a bobbin wound with a flat yarn is unwound vertically and unwound, one warp is formed every time the bobbin makes one revolution.
There is a problem that the twisting takes place and the flat state is crushed and partially converged. On the other hand, even if the yarn is unwound and fed so as not to be twisted, the flat state is crushed by the comb for equalizing the warp yarn density and the mail of the heald, and a woven fabric having a uniform yarn width cannot be obtained.

[0006] Weft yarns are disclosed in Japanese Unexamined Patent Publication No. 2-74.
According to the method disclosed in Japanese Patent No. 645, the weft is unwound, so that the weft is not twisted. However, in the method of actively rotating the bobbin, the unwinding speed varies depending on the winding amount, so that the starting and stopping are frequent. In particular, there is a problem that the flat yarn is twisted due to slackness caused by a delay in the stopping operation.

[0007] In order to solve the above problems, the present applicant has previously proposed the following (Japanese Patent Application No. 5-172156). That is, a warp yarn and / or a weft yarn made of flat carbon fiber yarn is intercepted and unwound, and weaving is performed while supplying the warp yarn and the weft yarn while maintaining the flat state, respectively. The obtained woven fabric is thin and has a uniform fiber density. When a carbon fiber reinforced plastic is produced, it can be an excellent material exhibiting extremely high strength properties. And according to this method,
Since the flat carbon fiber yarn wound around the bobbin is intercepted and unwound, untwisting twist does not occur.

[0008]

A flat yarn made of carbon fiber has a large number of filaments arranged in a flat shape and has a thickness of 0.5 to 0.5 mm.
The shape is only maintained by 1.5% of the sizing agent, the shape is very unstable, and the flat state is easily collapsed by a slight external force.

Further, since the flat yarn is a material used industrially, it is desirable to form it into a large package having a large winding amount. However, in this case, it is essential to wind the flat yarn while traversing it with a fixed number of windings.

However, if a wide flat yarn is wound on a bobbin while traversing, the flat yarn is bent in the width direction at the traverse reversal point, so that the filament near the inner angle of bending is naturally loosened. Then, the filament near the outer corner of the bend is wound up in a tension state, and is temporarily set in that state.

When the flat yarn is unwound while being pulled out from the bobbin wound in such a state, the drawing tension acts only on the filament near the outer angle of the flat yarn bending in the width direction of the traverse reversing portion. Has a problem that it is easily twisted and the twist is mixed into the woven fabric to form a fine thread, and it has been found that it is difficult to stably obtain a woven fabric having a uniform thickness.

Further, if the yarn path from the bobbin to the yarn path regulating guide, that is, the take-up direction is perpendicular to the bobbin plane, the yarn path lengths at both ends in the width direction of the flat yarn are substantially equal. One of the filaments at the direction end is unwound stably without loosening, and does not twist.

However, when the starting point of unwinding is at the end of the bobbin, the flat yarn is drawn obliquely with respect to the bobbin surface, and the yarn path lengths at both ends in the width direction of the flat yarn are different. Therefore, when the flat yarn is unwound while being pulled out in such a state, the filament on the bobbin center side in the width direction of the flat yarn is in a loose state, and the filament on the bobbin end side is in a tension state. Not only is not maintained, but also the flat yarn is easily twisted.

[0014] Such a problem is particularly likely to occur in non-stretchable yarns such as carbon fiber yarns. In the case of stretchable synthetic fibers, the unbalanced tension acting on each filament is absorbed by stretching. It is possible.

As described above, there is no satisfactory method for unwinding a flat yarn formed of a carbon fiber, particularly a carbon fiber, without twisting, and a proposal has been desired.

Accordingly, the present invention has been made in view of the above-mentioned problems, and a method and an apparatus capable of improving the drawbacks of the prior art and unwinding the flat yarn without crushing the flat state. An object of the present invention is to provide a flat yarn woven fabric having excellent characteristics using the method and the apparatus.

[0017]

In order to solve the above-mentioned problems, a flat yarn supply method according to the present invention comprises winding a flat yarn comprising a multifilament having a yarn width / yarn thickness ratio in a range of 30 to 150. When the flat yarn is unwound from a bobbin wound at a few 3/100 mm or less, the flat yarn is unwound while a touch roller is in contact with a package formed on the bobbin.

Further, the method for supplying a flat yarn according to the present invention comprises:
A flat yarn composed of multifilaments having a yarn width / yarn thickness ratio in the range of 30 to 150 is taken out from a bobbin wound with a wind number of 3/100 mm or less, unwound, and the unwound flat yarn is regulated. When passing the guide, the flat yarn is brought into contact with an arcuate guide provided between the bobbin and the yarn path regulating guide and extending in a direction transverse to the yarn path.

Further, in the method for supplying a flat yarn according to the present invention, the flat yarn composed of multifilaments having a yarn width / yarn thickness ratio in the range of 30 to 150 is formed by winding a 3/3/100 m winding yarn.
m and unwinds the flat yarn from the bobbin wound at m or less, and guides the unwound flat yarn to a predetermined position, by using at least three cylindrical guides in the horizontal or vertical direction in the width direction of the flat yarn. The method comprises the steps of sequentially changing the angle formed and supplying flat yarn while regulating the yarn path.

Each of the above-mentioned supply methods may be at least
The two methods can be combined. The method of the present invention is particularly effective when the flat yarn is a carbon fiber yarn.

The method for producing a flat yarn woven fabric according to the present invention includes any of the above flat yarn supplying methods in a weft supplying step and / or a warp supplying step.

As a more specific embodiment, the method for producing a flat yarn woven fabric according to the present invention comprises a step of unwinding a weft from a weft bobbin wound with a flat weft and unwinding the weft at a weft supply position by a guide means. Positioning in the horizontal direction, supplying the weft yarn under tension while holding the weft having the length necessary for one weft supply to the warp between the weft bobbin and the guide means, and supplying the weft bobbin and the guide The method includes a weft yarn supplying step of supplying a flat yarn by any one of the above-described methods.

Further, in the method for producing a flat yarn woven fabric according to the present invention, the warp yarns are unwound from each of a plurality of warp bobbins wound with warp yarns made of flat yarns, and these warp yarns are unwound using a comb. The flat yarns are drawn to a desired density while preventing the flat surfaces of the warp yarns from contacting other than the wire of the comb, and the flat surfaces of the respective warp yarns are converted to the horizontal direction and guided to the heald, and the flat yarns from the warp bobbins are converted. The supply includes a warp yarn supplying step performed by any of the above-described methods. Of course, a method including both the warp supplying step and the weft supplying step may be employed.

The flat yarn supply device according to the present invention has a yarn width /
A flat yarn made of a multifilament having a yarn thickness ratio in the range of 30 to 150 is a device for winding and unwinding a flat yarn from a bobbin wound with a wind number of 3/100 mm or less, and is formed on the bobbin. And a touch roller for contacting the package.

Further, the flat yarn supply device according to the present invention comprises:
A flat yarn composed of multifilaments having a yarn width / yarn thickness ratio in the range of 30 to 150 is taken out from a bobbin wound with a wind number of 3/100 mm or less, unwound, and the unwound flat yarn is regulated. An apparatus for passing a guide, wherein an arcuate guide is provided between the bobbin and the yarn path regulating guide, the arcuate guide extending in a direction crossing the yarn path and contacting the flat yarn.

Further, the flat yarn supplying device according to the present invention is a flat yarn comprising a multifilament having a yarn width / yarn thickness ratio in the range of 30 to 150, and winding the flat yarn with a winding number of 3/100 m.
m and unwinds the flat yarn from the bobbin wound below m, and guides the unwound flat yarn to a predetermined position, between the bobbin and the predetermined position, in a horizontal or vertical direction. The angle formed with respect to the flat yarn is sequentially changed, and at least three cylindrical guides for guiding the flat yarn while regulating the yarn path are provided.

Each of the above-mentioned supply devices has at least two
Two devices can be combined. These devices according to the present invention are particularly effective when the flat yarn is a carbon fiber yarn.

The flat yarn woven fabric manufacturing apparatus according to the present invention includes any one of the above flat yarn supply devices in the weft supply means and / or the warp supply means.

As a more specific embodiment, the flat yarn woven fabric manufacturing apparatus according to the present invention rotates in conjunction with the main shaft of the loom,
A take-up roller for drawing out the weft at a constant speed from a weft bobbin wound with a flat weft, guide means for horizontally positioning the drawn weft at a weft supply position, and a single weft supply for the warp A weft elastic suspension mechanism for holding a weft of an appropriate length between the take-off roller and the guide means, a tension applying mechanism for keeping the weft sent from the guide means under tension, and the weft bobbin. It is provided with a weft yarn supply means provided between the guide means and any one of the flat yarn supply devices described above.

The flat yarn woven fabric manufacturing apparatus according to the present invention is characterized in that a plurality of warp yarns drawn out from a plurality of warp bobbins wound with warp yarns made of flat yarn are brought into contact with flat yarns other than wires. A comb that adjusts the warp to a desired density while avoiding it, a guide that converts the flat surface of each warp yarn sent out from this comb into a horizontal direction, and a horizontal posture for each warp yarn sent out from this guide And a warp yarn supplying means including any of the above-described flat yarn supply devices provided in the flat yarn supply section from the warp bobbin while maintaining the opening and closing movement. Of course, a manufacturing apparatus including both the warp supply means and the above-described weft supply means can be used.

In the above method and apparatus,
When unwinding by taking out the flat yarn consisting of multifilament wound on the bobbin while unwinding via the touch roller that rotates while always in contact with the bobbin,
The bobbin surface can be unwound while always pressing against the bobbin surface with the touch roller, and the take-up tension can be prevented from reaching upstream of the contact point between the two.Therefore, the flat yarn has a bend in the width direction that occurs during traverse reversal. Even if the flat yarn is not twisted, it can be unwound in a desired flat state.

Further, an arcuate guide whose both ends are curved or bent is provided between the bobbin and the yarn path regulating guide, and the flat yarn is bent at least by a straight yarn path connecting the yarn path regulating guide from both ends of the bobbin. Or the bent portion, and can be unwound while controlling the yarn path length of each filament in the width direction of the flat yarn. Therefore, even if the flat yarn is pulled out obliquely from the end of the bobbin, the width direction of the flat yarn , The yarn path length of each filament can be made uniform at the curved portion of the arcuate guide, and the flat yarn can be supplied to the weaving unit while maintaining the flat state without twisting.

Further, when the flat yarn unwound from the bobbin is guided to a predetermined position, at least three cylindrical guides whose angles are sequentially changed are provided, so that the horizontal direction or the vertical direction in the width direction of the flat yarn is provided. It is possible to regulate the yarn path on each guide while gradually changing the angle with respect to, and it is possible to smoothly regulate the yarn path to a yarn path convenient for weaving and the like without crushing the flat state.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. 1 to 5
1 shows an apparatus for manufacturing a flat yarn woven fabric according to an embodiment of the present invention. In FIG. 1, this manufacturing apparatus is provided as a weft supply device, a bobbin 1, a tension roller 2, a take-up roller 3, a tension device 4, a guide roller 5 arranged in an S shape, a guide roller group 6, and an S shape. The device includes a guide roller 7, a leaf spring tension device 8, a push plate guide 9, a rapier 11, and the like. As a warp supply device, a creel 20, a comb 21, a horizontal guide 22, a heald 23, and a reed 24 are provided.

[0035] First, to describe the weft feeder, the bobbin 1, a carbon fiber flat yarn (hereinafter, simply referred to as. "Flat yarns") weft T _wf is wound consisting of a weft T _wf is a tension roller 2 Through the take-up roller 3 which is driven by the rotating main shaft of the loom.
Is unwound at a constant speed by the rotation of. Here, the tension roller 2 is located above when the weft thread _Twf is unwound from the bobbin 1, and is automatically lowered when the loom stops, and the brake works to stop the inertial rotation.

The unwinding speed of the weft T _wf can be easily determined if the loom rotational speed (rpm) and weft length required for one revolution (m) is known. Weft _Twf or Warp _Twr
The flat yarn to be formed is previously processed into a flat shape, and the shape is maintained by a sizing agent or the like, and the bobbin 1 is a cylindrical tube having a constant traverse width and the bobbin 20 of a creel 20 described later.
a, 20b.

The unwinding of the weft T _wf consisting of carbon fiber multifilament flat yarn from the bobbin 1 is configured as shown in FIG. Unwinding includes a bobbin holder 12 for holding a bobbin 1 weft T _wf is wound, the bobbin 1
A touch roller 13 that is constantly pressed into contact (contact pressure) with a package formed thereon, an arcuate guide 14 having at least both ends curved or bent, a yarn path regulation guide 15,
A swingable frame 16 supporting a touch roller 13 and an arcuate guide 14;
3 has a spring 17 that constantly urges the bobbin surface (the package surface on the bobbin) to come into contact with the bobbin surface.
In the illustrated device, the touch roller 13 and the arcuate guide 14 are attached together, but either one may be used.

The flat yarn wound on the bobbin 1 is a carbon fiber multifilament yarn having 3,000 to 100,000 filaments, and a sizing agent of 0.2 to 0.2.
1.5% adhered, and the yarn width was 5 to 20 mm, and the yarn width / thickness ratio was in the range of 30 to 150, and was flattened. Here, the thickness of the yarn is in accordance with JIS-R3414, Section 5.4, and the spindle is gently rotated using a micrometer, so that the measurement surface is lightly contacted in parallel with the sample surface, and the ratchet is sounded three times. Read the scale at the time of setting, and N = 10
Is taken as the thickness of the yarn. Also, how to wind the bobbin
The effect of the present invention is exhibited when the number of winds is 3/100 mm width or less.

That is, as the winding width is larger, the angle (traversing angle) between two straight lines connecting the yarn path regulating guide 15 and both ends of the bobbin 1 is larger, and the tension difference in the widthwise filament of the flat yarn to be drawn out is increased. Occurs, and twisting easily occurs.
The effect is particularly effective in the above range of the number of winds.

The number of winds here is 1/2 of the number of rotations of the bobbin during one traverse, and for the same winding diameter, the smaller the number of winds, the larger the twill angle. Increasing the number of winds reduces the twill angle, which is the preferred direction for flat yarn.However, in the case of non-twisted yarn, the fiber comes off the end face because the fiber approaches the end face in parallel with the end face. Therefore, the number of winds cannot be made too large.

The bending of the flat yarn in the width direction of the flat yarn at the time of traverse reversal is proportional to the twill angle at that time. Therefore, the larger the twill angle, the greater the disturbance of the flat yarn in the flat state.
In the present invention, the effect can be particularly exerted when the hoop angle is large, and particularly when the wind number is 3/100 mm or less. At this time, the diameter of the paper tube around which the flat yarn is wound is related. In this case, the paper tube has a diameter of 3 inches which is usually used for carbon fiber.

The bobbin 1 is set on the bobbin holder 12, and the flat yarn _{Twf is} unwound while rotating by the pulling tension. The touch roller 13 is in contact with the surface of the bobbin 1 and rotates following the rotation of the bobbin 1. It is preferable that the diameter is as small as possible, but the diameter is about 15 to 30 mm. It is preferable to attach rubber or urethane which has a high friction coefficient and does not damage carbon fibers so as not to damage the carbon fibers.

The contact position of the bobbin 1 and the touch roller 13 varies depending withdrawal height, the contact angle of the flat yarn T _wf of the touch roller 13 to be pulled out (winding angle) 30 °
As described above, it is particularly preferable that the angle be about 30 to 90 °.

The touch roller 13 is swingable toward the bobbin 1 with the lower end of the frame 16 as a fulcrum in order to always contact the surface of the bobbin.

The arcuate guide 14 is formed of a round bar having a diameter of 6 to 20 mm, the center of which is straight in the longitudinal direction, and both ends are bent in the same direction. It is 30 to 70% of the winding width of the bobbin 1. The bending angle at both ends is preferably 10 to 30 °, and it is preferable that the bending is performed gently from a straight portion at the center, and the bending may be straight (bent). The surface of the bow-shaped guide 14 preferably has low friction, and may be subjected to a satin finish or the like.

The mounting position of the bow guide 14 is preferably in the vicinity of the bobbin 1 and is a position about 50 to 150 mm from the bobbin surface on the side of the yarn path regulating guide 15. It is preferable that the guide 14 be lifted by 5 to 25 mm in a straight portion.

It is preferable to increase the distance between the yarn path regulation guide 15 and the bobbin 1 because the pull-out angle is reduced. However, if the distance is too long, there is a problem that the flat yarn is twisted between the bobbin 1 and the yarn path regulation guide 15, 300-1000
mm is preferable.

When the distance between the bobbin 1 and the yarn path regulating guide 15 is to be increased, several guide bars parallel to the flat surface of the flat yarn are provided therebetween, and the guide bar is run while lightly contacting the flat yarn to prevent twisting. May be added.

Further, the yarn path regulating guide 15 in the figure shows an example in which the horizontal position is regulated by two vertically provided bars. For example, as shown in FIG.
At 8a, 18b and 18c, the width direction of the flat yarn is inclined by about 45 ° from the horizontal direction, and then the guide bars 18c and 18c
It is also possible to regulate while returning in the horizontal direction by d and 18e.

It is preferable to increase the distance between the yarn path regulation guide 15 and the bobbin 1 in order to reduce the pull-out angle, and more specifically, it is preferable that the length is 300 mm or more.

FIG. 7 shows, in order to explain the operation of the embodiment shown in FIG. 2 in more detail, a point of contact between the bobbin 1 and the touch roller 13 immediately before unwinding the bent portion of the flat yarn _{Twf in} the width direction. It is a representation. If there is no touch roller 13 in this state, the take-up tension does not reach the point b and the tension is applied only to the point a. Then, the point a is shifted toward the center of the bobbin 1 so as to roll on the surface of the bobbin 1, and twisting easily occurs. However, although being pressed by the touch roller 13, tension is applied to the point a, but the flat yarn _Twf does not shift toward the center of the bobbin 1 and twisting does not occur. Also, since the linear distances b to c <the linear distances a to c, b to c
Although the c side is loosened, tension is applied to only one side in the width direction of the flat yarn, and it is difficult to supply the flat yarn while maintaining the flat state. A substantially constant tension can be applied to the filament, and twisting can be prevented.

The weft thread T pulled out from the take-up roller 3
_{The wf} is guided by a horizontal guide roller 5, a group of guide rollers 6, and a horizontal guide roller 7 via a guide 4 a of a tension device 4, and is guided to a leaf spring tension device 8.

Each of the guide rollers 5 to 7 has a diameter of about 10 to 20 mm and a length of 100 to 300 mm.
A rotation system with a built-in bearing is preferred. If the diameter is too small, the carbon fibers constituting the weft yarn _{Twf tend} to bend and single yarn breakage occurs. If the diameter is more than 20 mm, the inertia of rotation increases and the tension fluctuation at the time of starting and stopping increases. is there. In addition, the length of each of the guide rollers 5 to 7 needs to be such that the passing weft thread _Twf does not move in the left-right or up-down direction and does not contact the supporting portions supporting the guide rollers 5 to 7. When the weft thread _Twf comes into contact with the support portions of the guide rollers 5 to 7, the flat state is crushed.

Horizontal guide roller 5 and guide roller 7
Determines the position of the weft thread _{Twf to be} guided in the height direction, and the guide roller group 6 determines the position of the weft thread _{Twf in} the horizontal direction.
Therefore, the guide rollers need only be arranged at least in the horizontal and vertical directions.

The guide roller group 6 can be composed of a single vertical guide roller. However, as shown in this embodiment, several guide rollers whose angles are sequentially changed as shown in FIG. 6a, 6b, 6c, 6d and 6e, one of the guide rollers 6c (a guide roller disposed at the center in the feed direction) is preferably a vertical guide roller.

When the guide roller group 6 is composed of one vertical guide roller, the weft yarn _Twf is _disposed between the horizontal guide roller 5 and the vertical guide roller and between the vertical guide roller and the horizontal guide roller 7. It is necessary to twist the flat surface by 90 °. For this reason, the distance between the guide rollers depends on the width of the weft thread _Twf , but needs to be separated by 50 mm or more. If the distance between the guide rollers is smaller than 50 mm,
The weft _Twf passes through the vertical guide rollers and the horizontal guide rollers 7 while being twisted, and is woven. Further, when the flat yarn is twisted by 90 ° at a short distance, tension is applied to both ends of the flat yarn, and fluff is generated.

When a plurality of guide roller groups 6 are provided as shown in FIG. 3, for example, guide rollers 6a, 6
b (or 6d, 6e) is 20 to 60 ° with respect to the horizontal guide roller 5 (or 7) or the vertical guide roller 6c.
The angle may be changed sequentially within the range. Each of the guide rollers 6a, 6b, 6d, and 6e may be configured by a guide bar formed of a round bar or the like.

Each of the guide rollers 5 to 7 may be composed of a single roller. For example, as in the case of the configuration of the guide rollers 5 and 7, each of the guide rollers 5 to 7 is made up of two pairs and the weft thread _Twf is passed in an S shape. When a stable tension acting on the weft T _wf, it is possible to reliably position the weft T _wf.

In order to change the direction of the yarn path, a function is achieved if there is a horizontal guide roller 5 and a vertical guide roller 6c. For example, when the flat yarn _Twf is loosened between the guide rollers 5 and 6c. Since the flat surface is sent out in the horizontal direction by the guide roller 5, when the tension is applied again and comes into contact with the guide roller 6c, the flat surface is inverted and the flat yarn is twisted. If there are auxiliary guide rolls (or guide bars) 6a and 6b that are inclined at a substantially intermediate angle between the guide rollers 5 and 6c, the guides can be guided without reversing the flat surface. is there.

The tension device 4 is provided with a rapier 11 described later.
When the weft _{Twf is} intermittently inserted, the slack between the take-up roller 3 and the horizontal guide roller 5 of the weft _Twf unwound at a constant speed by the take-up roller 3 is absorbed by the spring 4b, and the weft _Twf is absorbed. Is always nervous. Unless the weft thread _Twf is tensioned by the spring 4b, the weft thread _Twf is twisted when it is loosened, and there is a problem that the weft thread _Twwf passes through the guide rollers 5 to 7 and is woven. The guide 4a provided at the lower end of the spring 4b is arranged horizontally long so that the flat surface of the flat yarn is guided horizontally.

As another method for keeping the weft thread _Twf taut, there is a method using air suction. However, this method has a problem that the weft thread _Twf is twisted during suction. Further, in the method of tensioning the weft thread _Twf by weight, there is a problem that the tension fluctuation becomes too large and the carbon fibers constituting the weft thread _Twf are damaged, and the method using the spring is the simplest and reliable.

[0062] Further, on the downstream side of the horizontal guide roller 7 of the weft T _wf, tension device 8 which uniform tension of the weft T _wf is disposed. This tension device 8
By sandwiching the weft thread _Twf between the two wide leaf springs 8a and 8b, the tension of the weft thread _Twf is maintained uniformly.

The weft T of the flat yarn woven fabric manufacturing apparatus of the present invention.
In _wf supply method, in principle, the guide roller group 6, in particular determines the yarn path of the weft T _wf by the vertical guide roller 6c, the yarn path of the weft T _wf by the hooking operation to tension fluctuation and rapier 11 May change. Therefore, even if the weft thread _Twf moves in the width direction, it is necessary that there is no object that interferes with the end of the weft thread _Twf . For this purpose, a tension device 8 having wide leaf springs 8a and 8b is used. The width of the leaf springs 8a and 8b may be at least five times the thread width of the weft thread _Twf .

The push plate guide 9 is arranged downstream of the weft thread _Twf of the plate spring tensioning device 8 and is a plate having a V-shaped guide surface 9a formed at the end. This guide 9
Is driven in the front-rear direction indicated by an arrow using a cam mechanism to which the rotation of the loom is transmitted in conjunction with the yarn feeding to the rapier 11.

In the vicinity of the downstream side of the push plate guide 9,
A yarn end gripping guide 10 is provided. As shown in FIG. 4, the thread end gripping guide 10 has an L-shaped receiving member 10a and a pressing member 10b which is driven in a vertical direction by a driving unit (not shown). When the weft thread _Twf is supplied to the rapier 11, the guide member 10 descends in parallel with the forward movement of the push plate guide 9, and presses the weft thread _Twf against the receiving member 10a to grip the yarn end. ing.

Accordingly, the weft thread _Twf is lowered by the push plate guide 9 being pushed out in the direction of the arrow, the flat surface being guided by the slope of the V-shaped guide surface 9a, and the yarn end gripping guide 10 also being lowered. As a result of crossing the tip of the rapier 11 without crushing the state, the rapier 11 is hooked on the claws 11a of the rapier 11 described later.

Normally, the weft _Twf is kept on standby by the yarn end gripping guide 10 and the yarn feed guide having the guide hole so that the weft _Twf crosses the rapier 11 diagonally. When reaching the yarn feeding position, both guides are lowered to hook the weft yarn _Twf on the claws 11a of the rapier 11.

[0068] However, the use of feed yarn guide during feeding yarn to the rapier 11, when the weft T _wf is flat yarn, the guide hole weft T _wf will collapse squamous form rubbed in. For this reason, in the manufacturing apparatus of the present invention, the pressing plate guide 9 is provided between the leaf spring tension device 8 and the yarn end gripping guide 10.
When the yarn is supplied to the rapier 11, the yarn end gripping guide 10 is lowered, and the push plate guide 9 is advanced, so that the weft yarn _Twf is pressed against the rear of the loom and the rapier 11 is pressed.
We crossed against.

The rapier 11 is, as shown in FIG.
4 is a longitudinal member arranged at the front part of the weaving unit, which operates intermittently in the horizontal direction to insert the weft yarn _Twf between the warp yarns _Twr , _Twr of the weaving unit. As shown in FIG. 5, the rapier 11 has a claw 11a for hooking a flat weft thread _Twf at its tip, and a holding tool 11b is attached near the claw 11a.

In the flat yarn woven fabric manufacturing apparatus according to the present invention, the weft yarn T _wf wound around the bobbin 1 is _unwound while being maintained in a good flat state by the weft yarn supplying step of the above-described weft yarn supplying device. The rapier 11 is unwound at a constant speed by the take-up roller 3 and loosened during intermittent weft insertion of the rapier 11 by the spring 4b of the tension device 4.
Is absorbed by. Then, the weft T _wf unwound from the bobbin 1, while being guided by the guide rollers 5-7, while being held in uniform tension leaf spring tension device 8, a pushing plate guide 9 and the yarn end gripping guide 10 Is hooked on the claws 11a of the rapier 11 and inserted between the warp yarns T _wr , T _wr of the weaving section as shown in FIG.

For this reason, the weft _Twf made of flat yarn is
The fabric can be formed without being twisted or the flat form being crushed.

Next, the warp yarn supplying device will be described. In the creel 20, a large number of bobbins are rotatably supported. FIG. 1 shows only the bobbins 20a and 20b, and the bobbins 20a and 20b have Similarly to the bobbin 1 of the weft supply device, the warp yarn T _wr made of flat yarn is wound, and the warp yarn T _wr is guided to the weaving machine side by unwinding. Unwinding speed of the warp T _wr from the bobbin 20a, 20b is extremely slow compared to the weft T _wf, is constant speed, the bobbin 20a, 20b there is no problem if it is with a light brake.

The warp unwinding section can have the same configuration as the weft unwinding section. For example, as shown in FIG. 8, the touch rollers 31 are attached to the warp bobbins 20a (20b).
Is always pressed and contacted, and an arcuate guide 32 is provided on the downstream side. Either the touch roller 31 or the arcuate guide 32 may be provided, but preferably both are provided as shown. With such a configuration, the plurality of warp yarns T _wr is _unwound while maintaining a good flat state without being twisted, similarly to the above-described weft yarn _Twf .

The comb 21 is provided with support frames 2 arranged vertically.
A plurality of wires 21b provided in the vertical direction at the same interval as the warp yarn _Twr of the woven fabric between 1a and 21a are connected, and the warp yarns _Twr are passed one by one between the wires 21b and 21b in the horizontal direction. Position. Here, the wire 21b is connected to the bobbin 20a of the creel 20,
Flat warps T _wr supplied from 20b the support frame 21
The length of the warp _Twr needs to be a predetermined length so that the flat surface of the warp _Twr contacts only the wire 21b without contact with the wires 21a and 21a. If the length of the wire 21b is less than the predetermined length, the warp _Twr will be crushed. The optimum length of the wire 21b is determined by the height of the creel 20 and the comb 2
1 and the distance to the horizontal guide 22, but a length of about 300 mm is required.

The horizontal guide 22 includes two guide bars 22
a, 22a, the warp yarns T _wr , T _wr unwound from the bobbins 20a, 20b are wound in an S-shape to regulate the vertical position. Here, the warp T _wr is comb 21 to be a flat surface is necessary to twist 90 ° between the horizontal guide 22. For this reason, the interval between the comb 21 and the horizontal guide 22 depends on the width of the warp yarn _Twr , but needs to be separated by 50 mm or more. If the distance between the comb 21 and the horizontal guide 22 is 50 mm or less, the warp yarn _Twr passes through the horizontal guide 22 while being twisted and is woven.

The healds 23 are arranged one by one for each of the warp yarns T _wr , and guide the respective warp yarns T _wr whose vertical position is positioned by the horizontal guide 22 to the reed 24. It is, make the shed through the weft T _wr on the downstream side of the reed 24 of each warp T _wr. Here, in the conventional heald, the mail has a vertically long shape in order to reduce interference between an adjacent thread and the heald. However, when a flat yarn is passed through a vertically long mail like this,
The flat shape is crushed, and weaving cannot be performed with the flat shape. Therefore, the heald 23
Is preferably formed in a horizontally long shape, and the mail 23a
Is set to be equal to or slightly longer than the width of the flat yarn used as the warp yarn _Twr . The shape of the mail 23a is preferably a rectangle or a horizontally long ellipse.

The reed 24 has a plurality of warp yarns T _wr unwound from a plurality of bobbins 20a, 20b and the like provided on the creel 20.
Are arranged at a predetermined density and guided to the cloth fell, and a large number of reeds 24b are vertically arranged on a frame 24a. Here, it is desirable to set the tension of the warp yarn _Twr as low as possible. This also in contact with the dents 24b lateral position slightly offset reed 24 the warp T _wr coming guided by the heald 23, is the tension of the warp T _wr is the flat shape is crushed low No, heddle 23
It is misaligned the warps T _wr shaking, because there is never warps T _wr are flat shape is crushed by one side of the mail 23a.

In the above-described warp yarn supplying device, the warp yarn _Twr is guided to the weaving cloth according to the following steps, and is woven into the weft yarn _Twf sent from the weft yarn supplying device to produce a carbon fiber flat yarn woven fabric.

First, a plurality of warps _Twr are unwound from a plurality of bobbins 20a, 20b and the like provided on the creel 20.
Each of the warp yarns T _wr is twisted by 90 ° after the position in the horizontal direction is positioned by the comb 21, and
It is led to. Each warp yarn T _wr guided to the horizontal guide 22
After the position in the up-down direction is determined, the reed 24
To form a shed through which the weft thread _Twf passes.

The plurality of warp yarns T unwound from the plurality of bobbins 20a, 20b of the creel 20 in this manner.
_{The wr} is arranged at a predetermined density by the reed 24 and guided to the cloth fell. Then, when the shed is formed by the heald 23, the interweaving operation of the rapier 11 inserts the weft threads _Twf between the multiple warp threads _Twr , and as shown in FIG. 1, the flat yarn woven fabric is manufactured. By this warp yarn supplying step, the warp yarns T _wr are arranged in a sheet shape at equal intervals, and stable weaving becomes possible.

[0081]

As described above, according to the method and apparatus for supplying a flat yarn and the method and apparatus for manufacturing a flat yarn woven fabric of the present invention, weaving is performed without twisting the flat yarn or crushing the flat state. When a carbon fiber reinforced plastic is manufactured using this woven fabric as a reinforcing substrate, irregularities can be formed on the surface due to uneven thickness of the twisted portion, or voids in the twisted portion can be formed. It is possible to avoid inconveniences such as generation of a resin excess portion and generation of voids, and a reduction in strength due to stress concentration at a twisted portion. In particular, according to the flat yarn unwinding method of the present invention, even if the flat yarn bobbin is wound under bad conditions for the flat yarn, the flat yarn is unwound without being crushed or twisted. And a very thin fabric can be stably obtained without producing defects.

In particular, thin carbon fiber woven fabrics have been very expensive because conventionally, expensive fine carbon fiber yarns were woven at high density. However, according to the production method of the present invention, inexpensive thick carbon fiber yarns are used. Since weaving is performed at a coarse density using fiber yarns, the productivity is high and the manufacturing cost is low. Further, since the flat yarn is woven at a coarse density, the crimp of the woven yarn is small, and the voids are small, so that when the carbon fiber reinforced plastic is used, it has excellent effects such as exhibiting extremely high strength characteristics. .

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a manufacturing apparatus for weaving a flat yarn woven fabric by applying the method for manufacturing a flat yarn woven fabric of the present invention.

FIG. 2 is an enlarged perspective view of a weft unwinding section of the apparatus of FIG.

FIG. 3 is an enlarged perspective view of a weft direction changing unit of the apparatus of FIG. 1;

FIG. 4 is a perspective view of a yarn end gripping guide in the apparatus of FIG.

5 is an enlarged side view of the tip of the rapier of the device of FIG. 1;

FIG. 6 is a perspective view showing another example of the structure of the weft yarn path regulating guide in the apparatus shown in FIG. 1;

FIG. 7 is a schematic plan view for explaining the operation of a weft unwinding section of the apparatus of FIG.

FIG. 8 is a schematic perspective view showing an example of a case where the method of the present invention is applied to warp yarn unwinding.

[Explanation of symbols]

Reference Signs List 1 bobbin (for weft thread) 2 tension roller 3 take-up roller 4 tension device (elastic suspension mechanism) 4a guide 4b spring 5-7 guide roller 8 leaf spring tension device (tension applying mechanism) 9 push plate guide 10 thread end gripping guide 11 Rapier 12 bobbin holder 13 touch roller 14 bow guide 15 yarn path regulation guide 16 frame 17 spring 18a-18e guide bar 20 creel 20a, 20b bobbin (for warp) 21 comb 22 horizontal guide 23 heald 23a mail 24 reed 31 touch roller 32 bow Guide T _wf weft T _wr warp

Claims (22)

[Claims] 1. A flat yarn comprising a multifilament having a yarn width / yarn thickness ratio in the range of 30 to 150 is wound with a winding number of 3
A method for supplying a flat yarn, wherein the flat yarn is unwound while a touch roller is in contact with a package formed on the bobbin when the flat yarn is traversed and unwound from a bobbin wound at / 100 mm or less. 2. A flat yarn comprising a multifilament having a yarn width / yarn thickness ratio in the range of 30 to 150 is wound with a winding number of 3
A direction in which the flat yarn is intercepted and unwound from a bobbin wound at a length of not more than / 100 mm, and the unwound flat yarn is passed through a yarn path regulating guide. A flat yarn supplying method, wherein the flat yarn is brought into contact with an arcuate guide extending to the flat yarn. 3. A flat yarn composed of multifilaments having a yarn width / yarn thickness ratio in the range of 30 to 150 is wound with a winding number of 3
When the flat yarn is traversed and unwound from a bobbin wound at / 100 mm or less, and the unwound flat yarn is guided to a predetermined position,
A flat yarn characterized by sequentially changing an angle of a flat yarn with respect to a horizontal direction or a vertical direction in a width direction by at least three cylindrical guides, thereby supplying the flat yarn while regulating a yarn path. Supply method. 4. A method for supplying a flat yarn, comprising at least two of the methods according to claim 1. 5. The flat yarn supplying method according to claim 1, wherein the flat yarn is a carbon fiber yarn. 6. A method for producing a flat yarn woven fabric, wherein the weft yarn supplying step includes the flat yarn supplying method according to any one of claims 1 to 5. 7. A method for producing a flat yarn woven fabric, wherein the warp yarn supplying step includes the flat yarn supplying method according to any one of claims 1 to 5. 8. A method for producing a flat yarn woven fabric, comprising the weft supply step of claim 6 and the warp supply step of claim 7. 9. A weft bobbin in which a weft consisting of a flat yarn is wound and unwound, and a weft is positioned horizontally by a guide means at a weft supply position, and between the weft bobbin and the guide means. The method according to any one of claims 1 to 5, wherein the weft yarn is supplied under tension while holding a weft yarn of a length necessary for one weft yarn supply to the warp yarn, and between the weft bobbin and the guide means. A flat yarn woven fabric manufacturing method, comprising a weft yarn supplying step of supplying a flat yarn according to the following. 10. A plurality of warp bobbins each having a flat yarn wound thereon.
Using a comb, these warp yarns are drawn to a desired density while keeping the flat surfaces of the warp yarns from contacting only with the wires of the comb, and the flat surfaces of each warp yarn are converted to a horizontal direction and guided to a heddle. A method for producing a flat yarn woven fabric, comprising a warp yarn supplying step of supplying a flat yarn from the warp bobbin by the method according to any one of claims 1 to 5. 11. A method for producing a flat yarn woven fabric, comprising the weft supply step of claim 9 and the warp supply step of claim 10. 12. A flat yarn comprising a multifilament having a yarn width / yarn thickness ratio in the range of 30 to 150 is supplied from a bobbin wound with a winding number of 3/100 mm or less, where the flat yarn is intercepted and unwound. A flat yarn supply device, comprising: a touch roller that contacts a package formed on a bobbin. 13. A flat yarn obtained by crossing and unwinding a flat yarn made of a multifilament having a yarn width / yarn thickness ratio in the range of 30 to 150 from a bobbin wound at a winding number of 3/100 mm or less, and unwinding the flat yarn. An apparatus for passing a yarn through a yarn path regulating guide, wherein a flattened guide extending between the bobbin and the yarn path regulating guide in a direction crossing the yarn path and contacting the flat yarn is provided. Yarn supply device. 14. A flat yarn obtained by intercepting and unwinding a flat yarn made of a multifilament having a yarn width / yarn thickness ratio in the range of 30 to 150 from a bobbin wound at a winding number of 3/100 mm or less. An apparatus for guiding a yarn to a predetermined position, wherein an angle between the bobbin and the predetermined position with respect to a horizontal direction or a vertical direction is sequentially changed to guide a flat yarn while regulating a yarn path. A flat yarn supply device comprising at least three cylindrical guides. 15. A flat yarn supply device including at least two devices among the devices according to claim 12. 16. The flat yarn according to claim 1, wherein the flat yarn is a carbon fiber yarn.
16. The flat yarn supply device according to any one of 2 to 15. 17. An apparatus for manufacturing a flat yarn woven fabric, wherein the weft yarn supply means includes the flat yarn supply device according to any one of claims 12 to 16. 18. A flat yarn woven fabric manufacturing apparatus, wherein the warp yarn supplying means includes the flat yarn supplying device according to any one of claims 12 to 16. 19. A method for producing a flat yarn woven fabric, comprising the weft supply means of claim 17 and the warp supply means of claim 18. 20. A take-up roller which rotates in conjunction with a main shaft of a loom and draws out a weft at a constant speed from a weft bobbin wound with a weft made of flat yarn, and a take-up yarn which is drawn horizontally in a weft supply position. A guide means for positioning, a weft elastic suspension mechanism for holding a weft of a length necessary for one weft supply to the warp between the take-up roller and the guide means, and a weft sent out from the guide means. A weft supply means including a tension applying mechanism for keeping the weft under tension, and the flat yarn supply device according to any one of claims 12 to 16, provided between the weft bobbin and the guide means. Also, a flat yarn woven fabric manufacturing apparatus. 21. A comb for pulling out a plurality of warp yarns drawn out from a plurality of warp bobbins wound with a warp yarn made of flat yarns to a desired density while preventing the flat surfaces thereof from contacting other than wires. A guide for converting the flat surface of each warp yarn sent from the comb into a horizontal direction, a heald for imparting an opening and closing motion to each warp yarn sent from the guide while maintaining a horizontal posture, and 17. A method for producing a flat yarn woven fabric, comprising: a warp yarn supplying means provided with a flat yarn supplying device according to any one of claims 12 to 16 provided in a flat yarn supplying section from a warp bobbin. 22. A method for producing a flat yarn woven fabric, comprising the weft supply means according to claim 20 and the warp supply means according to claim 21.