JPS6366357A - Three-dimensional weaving apparatus - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an apparatus for manufacturing a three-dimensional fiber structure.

[Prior art]

High-strength fibers such as carbon fibers, glass fibers, or metal fibers are used as reinforcing means for metal or plastic molded bodies.

Conventional reinforcing means consist of laminating reinforcing fibers in a flat plate shape in a plastic material, but with this structure of reinforcing fibers, it is not possible to use a large amount of fibers three-dimensionally. Even when laminated into many layers, there is no continuity between each layer, so a three-dimensional fiber reinforcement structure is not achieved, and the reinforcing effect is low compared to the amount of fibers filled.

In particular, there are fundamental problems in that it cannot be reinforced in three dimensions and it is difficult to achieve a high fiber volume content.

Therefore, a structure has been proposed in which a braided cord or a braided structure obtained by expanding the same, that is, a three-dimensional fiber structure is formed, and this is embedded in metal or plastic for reinforcement.

A weaving method for forming this three-dimensional fiber structure is described, for example, in US Pat. No. 4,312,261, and this weaving method is called a torsion lace method. This torsion lace method places a large number of bobbins in a moving plane, and by unwinding the yarn wound around the bobbins and changing the positions of the bobbins, a three-dimensional fiber structure is formed by intertwining the yarns. It is something to do.

As a weaving apparatus according to this method, there is one which is generally called "MAGNAW EAVE" and is described in the above-mentioned US patent. In this method, a large number of carriers carrying bobbins are arranged in a predetermined array within a limited plane of movement, and a built-in magnet maintains a minute gap between the carriers. In this method, carriers arranged in a vertical or horizontal line are moved as a group by the pressing force of a rod driven by an electromagnetic solenoid installed in the carrier.

In addition, as an improvement on the three-dimensional device described in the above-mentioned US patent, a linear motor is constituted by a bobbin carrier with a slider provided on the bottom surface and a stator provided on a moving plane to support the bobbin carrier, and each bobbin carrier is The present inventors have developed and already proposed a device that provides a self-driving force to the motor.

As a weaving device using this torsion lace method, high speed cannot be expected as a carrier driving method, but -M
Another option is to use a standard pneumatic or hydraulic cylinder.

Conventionally, in these torsion lace type three-dimensional weaving devices, the tension applied to the yarn to be woven is the unwinding tension from the bobbin generated when it is taken up by a take-up roller during weaving, or the tension applied to the yarn from the bobbin or the running yarn. This is due to the feed resistance force that acts as a simple brake on the row.

In other words, the tension was generated only while the yarn was running.

[Problems to be solved by the present invention]

In a torsion lace type weaving device, there is a problem in that depending on the moving direction of the bobbin carrier, the tension of the threads decreases, making it impossible to always weave with a uniform tension.

That is, when the bobbin carrier moves from the outside to the inside on the moving plane, for example, in FIG.
When moving sequentially from position l to position X2 and then from position X2 to position decreases momentarily. When the tension of the yarn decreases, the effect of tightening the tissue of the three-dimensional fiber structure decreases.

This means that the bobbin carrier moves at a fairly high speed in a controlled direction on the plane of movement, so that the yarn is The tension of the strips fluctuated rapidly, resulting in weaving before returning to a predetermined tension, making it difficult to produce a homogeneous three-dimensional fiber structure with a high fiber volume content. .

[Object of the present invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide an apparatus for weaving a homogeneous three-dimensional fiber structure at an industrially fast weaving speed by preventing a drop in yarn tension that occurs when a bobbin carrier moves. So, there it is.

[Summary of the invention]

To achieve the above object, the present invention provides an exit guide on a bobbin carrier that is disposed on a moving plane and is driven in an arbitrary direction, and the yarn that has passed through the exit guide is directed closer to the bobbin than the exit guide. This is a three-dimensional weaving device equipped with a tension applying mechanism that pulls the material into the material.

That is, the present invention is configured to apply a predetermined tension to the yarn wound around the bobbin when it is unwound, and to draw the yarn toward the bobbin from the exit guide when the yarn is loosened. It is.

For this retraction operation, an elastic body such as a spiral spring or a dancer roller is used, and the structure must be such that when a tension above a certain level is applied, no greater tension will be applied. It is.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a side view of a three-dimensional weaving apparatus in which the bobbin carrier is driven by a linear motor. A stator 3 is provided opposite to the bobbin carrier 1, and a slider (
rotor) is provided.

In the example shown in FIG. 2, the stators 3 are divided into two stators 3R13T in each direction of the two wheels.

A set of 3S and 3U forms one stator 3. The stator 3 consists of 7 stators A to G in the horizontal direction and 12 stators A-1 in the vertical direction, a total of 84 stators arranged adjacently in the shape of a grid and supported on a pedestal 4 made of a non-magnetic material. There is.

A linear motor is constituted by a slider 1m provided on the lower surface of the bobbin carrier 1 and a stator 3 provided on the moving plane 2, and segmented starters 3R and 3T are electromagnetic devices.
and the slider 1m form a linear motor capable of moving the bobbin carrier 1 in the horizontal direction in the figure, and the segmented stators 3S and 3U and the slider 1m form a linear motor capable of moving the bobbin carrier 1 in the vertical direction in the figure.

Therefore, by controlling the selection of energization to the stator 3, the bobbin carriers 1 on the moving plane 2 can be individually moved in any direction.

The electric wiring 10 for driving the stator 3 is connected to a power driver 9 separately.
is configured such that each stator 3 is independently controlled by a controller 8.

FIG. 3 is a sectional view showing the relationship between the bobbin carrier 1 and the stator 3, and shows a frame 1a constituting the bobbin carrier 1.
A slider 1m made of a magnetic material and having an uneven cross-sectional shape is provided on the lower surface of the stator 3, and this slider 1m faces the stator 3 with a small gap therebetween. and frame 1a
For example, ball-shaped casters In are provided at the bottom of the
The engaging portion 1p is fitted into a groove 2a provided in the moving plane 2 in order to move the bobbin carrier l lightly on the moving plane 2 and to prevent the bobbin carrier l from lifting up due to the tension of the filament 5.

In FIG. 2, to briefly explain the method of moving the bobbin carrier 1, the bobbin carrier located at 3Tm moves as shown by the arrow, and another bobbin carrier is similarly driven along a prescribed path. During this time, the position of the yarn 5 unwound from the bobbin is changed, and the three-dimensional fiber structure 6 is woven. In this figure, when the bobbin carrier l moves from the outside to the inside on the moving plane 2 in the direction of the arrow,
In all cases, the length of the yarn 5 between the take-off roller 7 and the bobbin carrier 1 shown in FIG. 1 is shortened, which results in a decrease in tension. Note that this three-dimensional fiber structure 6 may be considered to be similar to a large-sized braid.

As shown in FIG. 1, the woven three-dimensional fiber structure 6 is conveyed by a take-up roller while applying a predetermined tension.

Next, the main parts of the apparatus according to the present invention will be explained.

As shown in FIG. 3, the bobbin carrier 1 has a shaft 1b fixed to the center of the frame 1a with a fixture such as a pole 1c, and further supports a bobbin 1d on this shaft 1b. The flange portion 1e of the bobbin 1d is provided with a tension control device i for the yarn 5.
f is provided.

This tension control device raIf has a clutch 1h fixed to a shaft 1b as shown in FIG.
A windmill 1g is fixed on b by a key tg. And a spiral spring 1j with one end 1i fixed to the flange portion 1e.
Additionally, the clutch 1k is fixed to the clutch 1h, so that the elastic force of the spiral spring 1j acts on the clutch 1h. Also, clutch 1h has 11 pawls! is provided to be able to swing up and down, and meshes with the wind turbine 1g. That nail! A rotating roller 1s is fixed to the tip thereof, and a tension coil spring 1r that generates an engaging force between the roller 1s and the wind turbine 1g is fixed.

In addition, the gear shape of the windmill 1g is preferably a spline shape in which the rotating roller 1s can easily rotate.

The yarn 5 wound around the bobbin ld is pulled out to the three-dimensional fiber structure 6 side via the exit guide 1t provided at the center of the upper plate of the frame 1a according to the weaving operation (first (see figure).

Now, in the above device, when the bobbin carrier l moves from the outside to the inside on the moving plane 2 in FIG. 2, the distance between the take-up roller 7 and the bobbin 1d on the bobbin carrier l is shortened. As described above, the yarn 5 is loosened at this time, but the present invention prevents this loosening of the yarn 5.

As described above, the device according to the present invention is provided with a tension control device if configured to apply winding force to the bobbin 1d by the spiral spring 1j at the end of the bobbin ld.

Next, the operation of the tension applying mechanism, that is, the tension control device 1r will be explained.

When the yarn 5 is unwound, that is, when the bobbin carrier l moves so that the path of the yarn 5 between the bobbin 1d and the separate winding roller 7 increases, the bobbin 1d moves in the direction indicated by the arrow in FIG. The spiral spring lj is rotated as shown in FIG.
An elastic force sufficient to reversely rotate the bobbin 1d is accumulated at j.

In this case, when the winding of the spiral spring 1j reaches its limit, the clutch ih slips and no further winding is performed.It should be noted that when the clutch lh slips, the pawl type fixed to the shaft 1b As the tip 1h rotates above 1g, the claw lβ, specifically the rotating roller IS fixed to the tip, moves. In addition, since the timing at which the crack 1h starts to slip depends on the meshing force between the rotating roller IS and the wind turbine tg, the tension generated in the thread 5 is not only caused by the spiral spring Ij but also by the tension coil spring 1r that determines the meshing force. It can also be fine-tuned.

Next, as a result of the bobbin carrier 1 moving from the outside to the inside of the moving plane 2, the path of the yarn 5 is shortened.
When the tension of the yarn 5 decreases, the bobbin 1d rotates in the opposite direction of the arrow due to the elastic force of the spiral spring lj, and the yarn 5
The yarn 5 is wound around the bobbin 1d so that a predetermined tension is applied to the bobbin 1d.

FIG. 5 shows another type of tension control device 1f, which is equipped with a disc brake.

One end of the shaft 1b that supports the bobbin ld is fixed to the frame 1a with a bolt lc or the like. A NAND IE for adjusting the braking force is screwed onto this shaft 1b.

The disc brake includes a brake plate IA, a brake plate IB, and a compression coil spring IC having one end fixed to the brake plate IB, and the other end supported by the NAND IE. Although details are not shown, this nut IE is configured to press one end of the compression coil spring IC and prevent it from rotating. Also, axis 1
A bush 1D for stopping the compression coil spring 1d from shifting in the axial direction is fixed on the opposite side of b.

Next, the operation of this tension control device 1f will be explained.

When the bobbin 1d rotates in accordance with the unwinding of the yarn 5, twisting is applied to the compression coil spring IC via a disc brake that constitutes the tension control device 1f provided on the flange portion 1e of the bobbin 1d. This twisting becomes an elastic force for rotating the bobbin 1d in the opposite direction.

The compression coil spring IC has the function of pressing the brake plate IB to obtain a predetermined brake pressure, that is, determining the rotation timing of the bobbin 1d, and the function of accumulating reverse rotational force as the yarn 5 is unwound. It is something.

In the tension control device 1f having the above structure, the compression coil spring IC is twisted as the thread 5 is unwound when weaving the three-dimensional fiber structure 6, and elastic force (rotational elastic force) is accumulated. When this elastic force exceeds a predetermined value, the disc brake slips and no more elastic force is accumulated.

On the other hand, the bobbin carrier l moves in the direction where the tension of the yarn 5 decreases.
When the bobbin 1d moves, the elastic force stored in the compression coil spring IC causes the bobbin 1d to rotate in the opposite direction, thereby maintaining the tension of the yarn 5 at a predetermined value.

Also, is Figure 6 another type of tension system? '11 is a diagram showing the device 1r, and is an example of the device in which the tension generating mechanism is separated from the bobbin.

Inside the carrier frame 1 are the bobbin Id, the shaft 1b and the pole)
Consisting only of c, tension system? II+ device 1r is the frame 1a
It is installed in That is, the tension control device 1f consists of a support frame IF mounted on the frame 1a and a support plate IG, and the support plate IG equipped with a tension generation mechanism is fixed to the support frame IF.

The support plate IG having a tension applying mechanism has a fixed roller IH.
It consists of rollers such as a pressing roller II and a dancing roller IK, an exit guide 1t corresponding to the exit of the yarn 5, and a weight IJ held on the dancing roller IK.

Next, the operation of the tension control device 1f will be explained.

The yarn 5 unwound from the bobbin 1d passes through the guide IM, is hooked onto the fixed roller IH, passes over the dancing roller IJ, passes through the exit guide 1t, and is woven from the weaving point above the exit guide 1t. At this time, tension is generated in the yarn 5 due to the gravity of the dancing roller IK acting between the fixed roller IH and the weaving point. Therefore, in order to prevent the yarn 5 from slipping on the fixed roller IH, a presser roller II whose outer surface is made of rubber is used.
is holding down fixed roller 2H, and fixed roller I
H is also provided with a brake control mechanism (not shown) to prevent free rotation. In the example, the tension generated in the yarn 5 is controlled by changing the weight of the weight IJ attached to the dancing roller IK.
It is also possible to apply a tension coil spring, plate spring, etc. instead of O.

In the case of normal tension, the dancing roller IK is located relatively above the groove guide IL, and as described above, the bobbin carrier 1 moves from the outside to the inside on the moving plane 2, thereby controlling the tension of the yarn 5. When the tension starts to decrease, the tension is increased by descending below the groove guide LL, and the tension returns to a steady state before the tension increases again.

That is, the tension applying mechanism of this embodiment is an application of a general dancer roller method.

〔Effect of the invention〕

The three-dimensional weaving device according to the present invention is provided with an exit guide on a bobbin carrier that is placed on a moving plane and driven in an arbitrary direction, and the yarn that has passed through the exit guide is directed toward the bobbin from the exit guide. Since the retracting tension applying mechanism is provided, the following effects can be achieved.

(1) When the tension of the thread decreases as the bobbin carrier moves from the outside to the inside on the moving plane, the tension of the thread is reduced to a predetermined value by automatically drawing the thread toward the bobbin. This can prevent further decline.

(2) As the moving speed of the bobbin carrier increases, fluctuations in the tension of the yarn increase. However, according to the present invention, since there is a function to correct fluctuations in the tension of the yarn, the yarn is always kept at a predetermined level. Tension can be applied.

(3) Since the tension control device according to the present invention can obtain sufficient effects even if the structure is extremely simple, it is possible to provide an inexpensive device.

[Brief explanation of the drawing]

Figure 1 is a schematic side view of the three-dimensional weaving device, Figure 2 is a plan view showing the bobbin carrier placed on a moving plane, and Figure 3 is a side view showing the bobbin carrier and the mechanism that supports and drives it. 4 is a front view of a tension control device provided on a bobbin, and FIG. 5 is a side sectional view showing a bobbin carrier provided with a tension control device according to another embodiment. FIG. 6 is a sectional side view of an embodiment of a bobbin carrier provided with a tensioning mechanism based on another principle. l...Bobbin carrier, la...frame, lb...shaft, 1c...bolt, 1
d... Bobbin, 1e... Flange portion, 1r... Tension control device, Ig... Claw type, lj... Spiral spring, l
h...clutch, 11...claw, 1m...slider, 1t...exit guide, IA...brake pad, IB...brake plate, I
C... Compression coil spring, ID... Bush, lE.
... Nando, IF...support pedestal, IG...support plate,
IH...fixed roller, II...presser roller, IJ...
...Weight, IK...Dancing roller, IM...Guide, IL...Groove guide, 2...Moving plane, 3...
- Stator, 5... yarn, 6... three-dimensional fiber structure, 7... take-up roller.

Claims (1)

[Claims] A three-dimensional device that is provided with an exit guide on a bobbin carrier that is placed on a moving plane and driven in an arbitrary direction, and is provided with a tension applying mechanism that pulls the yarn that has passed through the exit guide toward the bobbin from the exit guide. Weaving equipment.