JPH01314766A - Braiding machine - Google Patents

Abstract

PURPOSE:To prevent defects and to eliminate pinholes and knots even in knitting yarn subjected to bonding treatment, by setting a knitting point die capable of bringing yarn close to a reinforcing layer to be knitted before the knitting point of knitted fabric and guiding the yarn. CONSTITUTION:Yarns 12a sent from a rotating carrier are guided by a knitting point die 7 set in front of a knitting point 6 and a reinforcing layer 12 is knitted at the knitting point 6 on rubber 11 of inner layer. The distance between the guide part of a top part 7a of the die 7 and the braiding layer 12 is set in such a way that a diameter D1 of the guide part of an imaginary concentric circle against an outer diameter d of the knitted layer 12 is approximately 2d-5d.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in an m-braiding machine for braiding, for example, a fiber reinforcement layer of a rubber hose.

[Prior Art] For example, a rubber port 10 used in a power steering hose or a brake hose for an automobile has a high pressure medium flowing therein and is constantly exposed to external forces such as vibrations. As shown in the inner layer rubber 11
A fiber reinforcing layer 12 made of braided fibers of vinylon, nylon, polyester, etc. is usually provided between the outer rubber layer 13 and the outer rubber layer 13.

Such a reinforcing layer needs to have good adhesion to the rubber, so it is necessary to perform an adhesive treatment such as RFL treatment in which a resorcinol resin is applied and baked at the yarn stage, and then M groups are formed by a machine, and a braided reinforcing layer 12 is formed on the inner rubber layer 11.

Figure 5 shows the conventional m ffl machine, and Figures 6 and 7
The figure shows how the reinforcing layer 12 of the rubber hose 10 is braided using the conventional braiding machine.

Reference numeral 1 designates a face plate, and the face plate 1 is rotatably provided with a number of carriers 2.2 for sending out braiding threads. As shown in the figure, the right-handed carriers 2a, 2a (white circles in the figure) rotate clockwise, and the left-handed carriers 2b, 2b (inner black circles in the figure) rotate counterclockwise. As the carriers 2a and 2b rotate and alternate, the yarns 12a and 12a are knitted, and the reinforcing braided layer 12 is formed on the inner rubber layer 11 at the knitting point 6.

In the figure, numeral 3 is a kite link that makes the kite come into contact with the threads 12a, 4 is a horse kite that serves as a steady rest, and 5 is a caterpillar for taking up.

After forming the braided layer as described above, the outer rubber layer 13 is coated by extrusion and vulcanized to obtain the rubber bow 10.

[Problems to be Solved by the Invention] The guide ring 3 in the above-described conventional device brings the threads 12a, which are carried by the carrier 2 and has a large number of threads into contact with the guide ring 3, as shown in FIG. 4(b). 12
This is for aligning the wires a and braiding them in this aligned state. However, when the adhesive treatment is applied, the thread 12a
slipping on the guide ring 3 becomes worse, the brake is applied to the thread and the thread curls up as shown in FIG. When intersecting at the top, for example, one or two of the four threads may be delayed, and the threads may not be aligned and may be braided unevenly onto the inner layer rubber 11. arise.

When the outer layer rubber 13 is extruded and coated on the incompletely braided reinforcing layer 12 with such uneven alignment and then heated for vulcanization, the inner layer rubber 11 is separated from the incompletely braided stitches. As shown in FIG. 8, pinholes 20 are formed on the inside of the rubber hose 10 and bumps 21 are formed on the outer periphery of the outer layer rubber 13, which protrude from the outer periphery, resulting in serious defects as a rubber hose for high-pressure media. There is a risk that this may occur.

To prevent the occurrence of pinholes 20, etc., the inner layer rubber 11 should be semi-vulcanized or vulcanized first, or the outer layer rubber 13 should be wrapped with tape or extruded with lead. A means of vulcanization is required, which requires equipment and man-hours, which poses many economical problems.

The present invention solves the problems of the prior art as described above,
A braiding machine that can easily align the threads to be braided even when braiding adhesive-treated non-slip threads, and eliminates the occurrence of pinholes and lumps by always braiding a sound reinforcing layer. This is what we are trying to provide.

[Means for Solving the Problems] In the present invention, a knitting point die that can guide the yarn as close as possible to the reinforcing layer to be braided is installed in front of the knitting point of the braid, instead of the guide link.

If the die is installed in this way and the yarn is aligned with the die at a distance of 2 to 5 times the outer diameter of the reinforcing layer, the contact between the die and the yarn will be shortened to the @ end, and the number of yarns held will be large. The threads are less likely to lag, and curling due to braking is avoided, allowing braiding to be performed in a healthy alignment.

[Example] The present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory diagram showing how the reinforcing layer 12 is braided on the inner rubber layer 11 using the braiding machine according to the present invention.
Components that are the same as those of the conventional example are designated by the same reference numerals.

As described above, the yarns 12a, 12a sent out from the carrier 2.2 rotating on the face plate 1 are brought into contact with the knitting point ties installed in front of the knitting point 6, and are braided onto the inner layer rubber 11 at the knitting point 6. Then, a reinforcing layer 12 is formed.

FIG. 2 is an enlarged sectional view showing a specific structure of the knitting point ties.

Taisuf is entirely or almost mushroom-shaped, with its top 7a
The threads 12a, 12. a is contact-guided and braided at knitting point 6. Regarding the distance from the braided layer 1-2 to the contact guide portion of the top portion 7a, the distance from the braided layer 12 shown in FIG.
It is preferable that the contact kite part exists so that the diameter D1 of the contact guide part of a virtual concentric circle with respect to the outer diameter d is approximately 2d to 5d, and more preferably 2.5d. It is desirable to configure the structure so that the

Note that this contact kite part is the part where the threads 12a, 12a come into contact and rub, so be careful not to damage it.
mmR to 15mmR depends on how rounded and mirror-finish it needs to be.

As mentioned above, the deviation in the configuration of the contact kite part allows the distance between the kite part and the knitting point to be set to be extremely shorter than in the conventional example using the guide link, and the deviation in the configuration of the contact kite part can be set to be extremely shorter than in the conventional example using the guide link. Even if the number of threads 12a, 12a increases
Since there is no space in plane space that would cause the threads to curl up as shown in Figure 4 (a) or to cause threads to lag when intersecting as shown in Figure 7, The threads 12a, 12a are kited in a state in which they are always aligned, and then immediately braided with knitting points to form a sound braided layer with good quality.In the subsequent vulcanization, the pinholes and The fear of bumps forming and slithering is eliminated. However, if D1 is smaller than 2d, the braiding will not be performed properly because the braiding point is too close to the knitting point, and if D1 is larger than about 5d, the same effect as that of conventional guide links will occur, which is not desirable. .

Moreover, the reason why the concrete configuration of the tie according to the present invention is configured in a mushroom shape as described above is because it is necessary to form a nozzle angle α between the outer circumferential surface 7b of the die and the axis.

If it is only necessary to have the apex 7a for the contact kite, then α-0°, that is, a cylindrical die may be sufficient, but in the present invention, the die is installed in the vicinity of the knitting point. However, if a cylindrical die that does not have such an angle α is used, the yarn may be braided around the outer periphery of the die, which is inappropriate. Angle α
is the key to preventing such situations. However, this angle α is the braid rest angle (depending on the device, but specifically 5
If the braiding machine is 4°44- or less), the thread 12a at the top 7a as shown in FIG.

Unable to kite 12a. This angle α is not more than the above-mentioned braid resting angle and is suitably set at about 40° to 456 degrees. As a specific shape of the die having such an angle α, the outermost diameter D2 of the tie is 2D1 to 2D.
．． The die having a diameter of 5Dt can be said to be convenient in terms of convenience in handling and the space available for mounting the die in the braiding machine.

In the above example, an example is shown in which the tie cloth is kept in a fixed state, but it is possible to make the thread with the adhesive treatment slip easily on the die surface by applying vibration with a vibrator or heating it with a heater. If you do so, you can expect better results.

[Effects of the Invention] As described above, according to the braiding machine according to the present invention, even when braiding is performed using non-slip yarns treated with RFL, it is possible to braid extremely smoothly, and to stably create a braided layer of good quality. It enables healthy formation, and when applied to rubber bosses, etc., it can eliminate the occurrence of pin poles and bumps on the outer periphery, which can be fatal, and its industrial value is truly great.

[Brief explanation of the drawing]

Fig. 1 is an explanatory sketch showing an embodiment of the present invention, Fig. 2 is an enlarged cross-sectional view of the knitting die portion, and Fig. 3 is B--B in Fig. 1.
B direction sketch, FIG. 4 is an explanatory diagram showing how the threads are aligned, FIG. 5 is an explanatory diagram showing a conventional braiding machine, FIG. 6 is an A-A direction diagram of FIG. 5, and FIG. 7 is a conventional example. FIG. 8 is an explanatory diagram showing the delay of the thread at the guide link portion when the rubber hose is turned. FIG. 8 is an explanatory diagram with a partial cross section showing the occurrence of defects in the rubber hose. 1: Face plate, 2: Carrier, 4: Steady rest kite, 5: Take-up plate, 6: Knitting point, 7: Knitting point die, 7a: Kite top part 3. 7b = outer surface, = 10-11: inner layer rubber, 12: reinforcing braided layer, 12a: thread. 10+ talks to my agent, patent attorney Fujioichi Sato. Torge Figure 3, b Figure 4 Figure 5 Figure 6 2b "0" tile

Claims (2)

[Claims] (1) In a braiding machine that braids a large number of carriers by rotating them around the outer periphery of the braided body, the braiding yarn is placed from the outer periphery of the braided body 2 to 5 times the outer diameter of the braided body before the braiding point where the braiding yarn is braided. A braiding machine equipped with a knitting die capable of contacting and guiding braiding yarns at positions separated by a certain distance. (2) Claim 1, wherein the knitting die is formed in a mushroom shape with the apex at the position where the braiding yarn comes into contact, and the angle of the cap-shaped outer circumferential surface with respect to the axis is less than or equal to the braiding resting angle.
Braiding machine as described.