JPH07229042A - Braiding method - Google Patents

Abstract

PURPOSE:To form a braid of stabilized quality by weakening the stretch of yarns, smoothing crossing operations and preventing the yarns from being caught at crossing points or a tension from fluctuating. CONSTITUTION:This method for braiding is to lift a vertical rod (g2) supporting a horizontal ring part (g1) in a braider by rotation of an eccentric cam 15 interlocking through bevel gears 13 and 14 with a toothed wheel 10 and a spur gear 12 for driving bobbin carriers (C), excessively withdraw yarns (Y) from the bobbin carriers (C) before the plural yarns (Y), taken out of the bobbin carriers (C) and proceeding to a braiding point (P) of a mandrel (m) cross on the horizontal ring part (g1) of an annular guide member, simultaneously lower the vertical rod (g2) by the rotation of the eccentric cam 15 and reduce the tension of the yarns (Y). Thereby, the yarns (Y) are smoothly crossed and stably fed to the braiding point (P).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a plurality of yarns or fiber bundles (hereinafter, simply referred to as "yarns") interlaced,
The present invention relates to a braiding method for forming a composition around a mandrel.

[0002]

2. Description of the Related Art Conventionally, for example, two groups of bobbin carriers are made to run in opposite directions along a circular orbit having a continuous figure of eight, and the position and position of a mandrel having an appropriate shape such as a T-shape. A braiding method is known in which yarns are crossed around a mandrel to control the posture to form a composition.

[0003]

The problem to be solved by the braiding method of the present invention will be described using the braider shown in FIG. 7, which is a perspective view of a braider as an example.

In the braider shown in FIG. 7, a bobbin b, on which a yarn Y is wound, is placed along a circular track 2 in which a figure 8 is formed continuously on a top plate 1. Two groups of loaded bobbin carriers C (illustratively only two bobbin carriers C are shown in FIG. 7) are arranged to run in opposite directions.

On the other hand, a mandrel (a T-shaped mandrel is shown in FIG. 7 as an example) m is a shaft 3 which is rotated by a motor M1 capable of rotating in the normal and reverse directions.
The L-shaped rotary arm 4 is attached to the mandrel support member 5 at the tip of the rotary arm 4 by a suitable fixing means such as a screw. A forward / reverse rotatable motor M1 and a shaft 3 which can be rotated and moved up and down along the vertical frames f1 and f1 ′ by a forward / reverse rotatable motor M2 via an appropriate transmission means (not shown) are arranged. It is configured to control the position and posture of the mandrel m attached to the mandrel support member 5 by appropriately moving up and down the installed elevating block 6.

The yarn Y drawn from the bobbin b mounted on the bobbin carrier C is bent at the upper end surface G'of the annular guide member G and is guided by the upper end surface G'to make up the composition of the mandrel m. At point P, the composition is formed.

Since the two groups of bobbin carriers C described above travel along circular tracks 2 in which eight figures are continuous in opposite directions, the bobbin carriers C traveling in opposite directions. The yarn Y drawn out from the bobbin b placed on the head toward the composition point P is the annular guide member G.
However, since the yarn Y does not loosen and is always tensioned and pulled out from the bobbin b, the yarn Y does not smoothly cross and the composition is There are problems that the yarn Y is not smoothly transferred to the point P, the yarn Y is caught at the intersection, and the tension of the yarn Y fluctuates.

The object of the present invention is to solve the above-mentioned problems of the conventional braiding method and to achieve a stable composition, and thus to form a composition having stable quality and improved quality. It is to provide a braiding method capable of doing.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention reduces the tension of a yarn during the crossing of the yarn to weaken the tension of the yarn. Also,
The yarn is pulled out from the bobbin carrier before the yarn is crossed, the tension of the yarn is reduced during the yarn crossing, and the tension of the yarn is weakened. The yarn is excessively pulled out from the bobbin carrier by the movement of the guide member, and then at least immediately before the crossing of the yarn,
By moving the guide member in the opposite direction to the above-mentioned movement, the tension of the yarn is weakened during the crossing of the yarn.

Examples of the braider of the present invention will be described below. However, as long as the gist of the present invention is not exceeded, any
The present invention is not limited to this example.

[0011]

1 is a perspective view of a braider to which the braiding method of the present invention is applied. FIG. 1 shows a horizontal ring portion g for guiding an annular guide member G by bending a yarn Y.
1 and an appropriate number of vertical bars g2 supporting the ring portion g1 and, as will be described later, the annular guide member G is configured to move up and down, which is different from the above-mentioned braider, and other than that. Since the configuration is the same, the description is omitted.

FIG. 2 is a partially enlarged side view including a partial cross section of the braider shown in FIG. 1. In FIG.
10 is an impeller attached to the tip of the vertical shaft 11,
The leg shaft c1 of the bobbin carrier C is configured to engage with the recess 10 'provided in the impeller 10. 12
Is a spur gear attached to the vertical shaft 11 below the impeller 10. The vertical shaft 11 is rotated by an appropriate drive source to rotate the spur gear 11 and meshes with the spur gear 11. Drive similar adjacent spur gears. By rotating the spur gear 11 group in this manner, the impeller 10
The group is rotated to move the leg shaft c1 of the bobbin carrier C engaged with the recess 10 'of the impeller 10 so that the bobbin carrier C travels along the track 2.

Reference numeral 13 denotes a bevel gear attached to the vertical shaft 11, a similar bevel gear 14 meshes with the bevel gear 13, and an eccentric cam 15 is attached to a rotating shaft 14 'of the bevel gear 14. Has been done. Also, on the cam surface 15 'of the eccentric cam 15,
The vertical bar g2 of the annular guide member G that extends downward through the upper plate 1 is in contact with it. 16 is a bearing attached to the lower surface of the upper plate 1 that supports the vertical rod g2 of the annular guide member G, and 17 is a flange attached to the vertical rod g2. In between, vertical bar g2
Coil spring 1 for urging the eccentric cam downward to maintain the contact state between the cam surface 15 ′ of the eccentric cam 15 and the vertical rod g2.
8 are provided. Therefore, the vertical shaft 11 is rotated by an appropriate drive source to rotate the spur gear 11 and the impeller 10 to drive the bobbin carrier C along the track 2 and to rotate the bevel gear 13 and the bevel gear as described above. Gear 14
The vertical bar g of the annular guide member G that is in contact with the cam surface 15 ′ of the eccentric cam 15 by rotating the eccentric cam 15 via
2 can be moved up and down.

Next, regarding the action of vertically moving the vertical rod g2 of the annular guide member G and the timing thereof,
The bobbin carrier C will be described with reference to FIGS. 3 to 5, which are schematic perspective views showing a traveling order along the track 2.

In FIG. 3, the bobbin carrier C located on the left side (hereinafter referred to as "bobbin carrier Ca") is located in the right direction as indicated by arrow X, and the bobbin carrier located on the right side. C (hereinafter, referred to as "bobbin carrier Cb") is shown traveling leftward as indicated by arrow Z toward the intersection 2'of the track 2. In this state, the yarn Y drawn from the bobbin carrier Ca (hereinafter,
It is called "yarn Ya". ) And the yarn Y drawn from the bobbin carrier Cb (hereinafter referred to as “yarn Yb”).
And are bent and guided by the ring portion g1 of the annular guide member G without crossing. From this state, the vertical bar g2 of the annular guide member G is lifted by the eccentric cam 15 to raise the ring part g1. By raising the ring portion g1 in this way, the yarns Ya and Yb can be extra pulled out from the bobbins placed on the bobbin carriers Ca and Cb.

From the state shown in FIG. 3, the respective bobbin carriers Ca, Cb move toward the intersection 2'of the track 2, and as shown in FIG. Just before the bobbin carrier Cb reaches the intersection point 2 ′ of the track 2 and near the intersection point 2 ′ of the track 2 and immediately before the yarn Ya and the yarn Yb intersect, the vertical direction of the annular guide member G is increased. The rod g2 is lowered by the eccentric cam 15 to lower the ring part g1. In this way, yarn Ya and yarn Y
Immediately before the crossing with b and as shown in FIG. 5, preferably, during the crossing of the yarn Ya and the yarn Yb, the ring part g1 is lowered so that the bobbin carriers Ca and Cb are mounted. Since the tension of the yarns Ya and Yb excessively drawn from the wound bobbin is reduced and the tension of the yarns Ya and Yb is weakened, the crossing operation between the yarn Ya and the yarn Yb is smoothly performed. .

Therefore, in the conventional braiding method as described above, the yarn crossing operation is not smoothly performed, and the yarn is not smoothly transferred to the composition point.
It is possible to solve the problem that the yarn is caught at the crossing point and causes tension fluctuation of the yarn. Yarn Ya and Yb
After the crossing operation with the yarn Ya and the yarn Yb, the vertical bar g2 of the annular guide member G is lifted by the eccentric cam 15 again as shown in FIG. The ring part g1 is raised.

The ring portion g of such an annular guide member G
By moving 1 up and down, bobbin carrier Ca,
Excessive drawing of the yarns Ya and Yb from the bobbin placed on the Cb and reduction of tension of the yarns Ya and Yb during crossing of the yarns Ya and Yb, weakening of tension of the yarns Ya and Yb. Thus, the crossing operation between the yarn Ya and the yarn Yb is smoothly performed.

FIG. 6 is an embodiment showing the ascending / descending distance (b) of the ring portion g1 of the annular guide member G in relation to the development view (a) of the track 2, which is approximately at the intersection 2'of the track 2. Since the yarns Y intersect, the ring portion g
1 is raised, and the ring portion g1 is raised to the highest position immediately before crossing. Thus, the extra yarn Y is pulled out from the bobbin placed on the bobbin carrier C. Then
Immediately before the yarn Y crosses, the ring part g1 is lowered,
At the time of crossing the yarn Y, the tension of the yarn Y excessively pulled out from the bobbin placed on the bobbin carrier C is reduced,
Reduce the tension on the yarn Y. After the crossing of the yarns Y, the ring portion g1 of the annular guide member G which has reached the lowest position is raised again at the above timing.

The ring portion g1 of the annular guide member G described above.
The raising and lowering steps and the raising and lowering timings of the above are examples, and as long as the gist of the present invention is not exceeded, in such an embodiment,
It is not limited. For example, immediately before the yarns Y cross each other, the raising and lowering operation of the ring portion g1 of the annular guide member G is performed once, and the yarn Y is excessively pulled out from the bobbin placed on the bobbin carrier C and the yarn Y is removed. The tension of the yarn Y is lowered during the crossing, the tension of the yarn Y is weakened, and the crossing operation of the yarn Y is smoothed. Otherwise, the lifting operation of the ring portion g1 of the annular guide member G is stopped. You can also leave it.

In the above-mentioned embodiment, an example in which the annular guide member G is moved by mechanical means interlocking with the spur gear 11 and the impeller 10 for driving the bobbin carrier C is shown. A sensor for detecting the position of the carrier C and a signal from the sensor may be used to activate an actuator such as a suitable fluid cylinder to move the annular guide member G.

[0022]

Since the present invention is constructed as described above, it has the following effects. By lowering the tension of the yarn during the crossing of the yarn so as to weaken the tension of the yarn, the crossing operation of the yarn is performed smoothly, and therefore the smoothing of the yarn to the composition point is performed. The transfer can be achieved, and the problem that the yarn is caught at the crossing point and the tension of the yarn is changed can be solved.

[Brief description of drawings]

FIG. 1 is a perspective view of a braider to which a braiding method of the present invention is applied as an example.

2 is a partially enlarged side view including a partial cross section of the braider shown in FIG. 1. FIG.

FIG. 3 is a schematic perspective view showing a traveling sequence along a trajectory of a bobbin carrier.

FIG. 4 is a schematic perspective view showing a traveling sequence along a trajectory of a bobbin carrier similar to FIG.

FIG. 5 is a schematic perspective view showing a traveling sequence along the track of the bobbin carrier, which is also similar to FIG.

FIG. 6 is an embodiment showing the ascending / descending distance of the ring portion of the annular guide member in relation to the development view of the track.

FIG. 7 is a perspective view of a braider as an example for explaining a problem to be solved by the braiding method of the present invention.

[Explanation of symbols]

 C, Ca, Cb ... bobbin carrier G ... ... annular guide member Y, Ya, Yb ... thread g1 ... ... ring part g2 ...・ ・ ・ Vertical bar 2 ・ ・ ・ ・ ・ ・ Orbit

Claims (3)

[Claims] 1. The tension of a yarn is reduced during the crossing of the yarn,
A braiding method characterized in that the tension of the yarn is weakened. 2. The yarn is drawn out from the bobbin carrier before the yarns are crossed, the tension of the yarns is lowered during the yarns crossing, and the tension of the yarns is weakened. Braiding method. 3. The yarn is drawn out of the bobbin carrier by the movement of the guide member before the yarn is crossed, and then at least immediately before the yarn is crossed, the yarn is moved in the opposite direction to the above-mentioned movement of the yarn. A braiding method characterized in that the tension of the yarn is weakened during the crossing of the yarn.