JPH0726482A - Apparatus for rotation waving of metallic wire - Google Patents

Abstract

PURPOSE:To obtain an apparatus for the rotation waving capable of enlarging the interval of waving pins to be arranged zigzag to >=1/2 of the waving pitch to be obtained and applying helical waves in a stable shape and at a stable pitch to a metallic wire. CONSTITUTION:Three waving pins 8-1 to 8-3 are arranged zigzag and attached to a rotating shaft 4 rotating with a position for passing a metallic wire 1 as the center. In the process, the distance (Lo) between the pins 8-2 and 8-3 is regulated to <=0.5 the distance (Li) between the other pins and to 0.5-0.85 of the pitch (Pw) of waves to be obtained. Thereby, the extent of twist flowing back and propagating between the pins 8-2 and 8-3 can be reduced without excessively increasing the bending angle of the metallic wire. As a result, the purpose can be achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary corrugating device used to preliminarily form a metal linear member forming a metal cord for reinforcing a rubber article into a spiral wave shape in order to improve the durability of the rubber article.

[0002]

2. Description of the Related Art Metal cords used to reinforce various rubber articles such as automobile tires, conveyor belts, and high-pressure hoses have good rubber permeability to enhance the rubber coverage of each metal filament constituting the cord. In addition, corrosion resistance and fatigue resistance can be improved, leading to improved durability of rubber articles.

Therefore, in Japanese Patent Publication No. 63-63293, a twist pitch is separately provided for each metal filament by using a rotary corrugating device in which a plurality of peg pins (corrugating pins) are alternately arranged in a staggered pattern. With a constant wave at a smaller pitch,
It proposes a manufacturing method and a manufacturing apparatus of a metal cord which creates a gap between the metal filaments for improving the infiltration of rubber by twisting this with a double-twisting machine.

As described in Japanese Utility Model Publication No. 2-20239, the metal cord manufactured by such a method and apparatus has a pitch Pw of waves preliminarily attached to a metal filament and a twist pitch P of 0. It is necessary to make it 1 to 0.5 times. 0.5
If it exceeds twice, the bent corrugated shape is likely to disappear in the twisting process of the cords, but the twisting pitch of the metal cord is usually about 8 to 18 mm, and therefore the corrugating pitch Pw is at most 9 mm. Very small with the degree.

Conventionally, a wave with such a small pitch is
I'm trying to attach them with habit pins that are evenly spaced. In this equidistant arrangement, the distance L between the pins may be set to 1/2 of the pitch of the wave, but the pin diameter is usually 2 to 3
Since it is mm, it is difficult to meet the demand in consideration of workability particularly when Pw is set to 8 mm or less. Therefore, in the conventional rotary corrugating device, the distance L between pins is 1/2 of the corrugating pitch Pw. Had to be bigger than.

[0006]

The distance L between the pins is constant (equal spacing), and the distance L is corrugated pitch P.
If it is larger than 1/2 of w, a difference will occur between the wave shape to be finally obtained and the wave shape to be actually obtained, and the influence of the twist due to the rotation of the device will appear, and The pitch and the wave shape of the spiral wave are likely to be uneven in the direction, and a desired metal cord having a constant quality cannot be obtained.

An object of the present invention is to provide a rotary corrugating device that solves such a quality problem and expands the distance between pins as much as possible to improve workability.

[0008]

In order to solve the above-mentioned problems, the present invention has n (3≤n≤5) corrugated pins on a rotary shaft which rotates around the wire passage position of a metal filament. In a zigzag arrangement, pass the metal filaments between these pins, and apply a fine spiral wave to the metal filaments by bending with the pins and rotation of the rotating shaft. Regarding the distance between pins, the distance between the two pins closest to the outlet is made shorter than the distance between the other pins.

In this device, when the total number of corrugated pins is three, it is desirable that the following equation be satisfied for the distance between the two pins on the outlet side. Lo ≦ 0.5Li and 0.5Pw ≦ Lo ≦ 0.85Pw where Lo: distance between two pins on the outlet side (mm) Li: distance between two pins on the inlet side (mm) Pw: obtained metal wire Spiral wave pitch of the strip If the metal strip is spirally corrugated at a pitch of 3 to 8 mm, the diameter of the corrugating pin used is 1.2 to 3.
It is desirable that the range is 0 mm, the total bending angle α of the metal filament by the central pin is 50 ° or less, and the inlet side bending angle αi is 2 ° or more.

Further, it is preferable that the rotary shaft is supported in a cantilever state by a bearing arranged on the wire entry side of the corrugated pin mounting portion of the shaft. In addition, the corrugated pins that are arranged in a staggered arrangement on the rotating shaft are
It is desirable to arrange the center of the metal filament in a position where it overlaps with the axis of the rotating shaft. With this arrangement, if the diameter of the pin is D and the diameter of the metal filament is d, make a hole so that the center of the pin mounting hole is (D + d) / 2 away from the axis of the rotating shaft. realizable.

[0011]

In general, in the case of applying a spiral wave to a metal filament, at least three pins are arranged in a staggered arrangement, as in the preform device of the once-twisting machine shown in Japanese Patent Publication No. 3-67155. Although it is sufficient to pass the metal linear member between the pins, if the corrugation pitch is small, the inter-pin distance L cannot be set to 1/2 of the corrugation pitch Pw as described above. In this case, the design is unavoidably L> 1 / 2Pw, but the smaller the spiral corrugation pitch Pw is, the larger the twist amount per unit length of the corrugated metal linear body is, resulting in a large rotational torque. Between outlet pins (Fig. 2
Backflow propagation of the twist occurs between the pins 8 _-2 and 8 _-3 of the pin and the spiral corrugation pitch (which is larger than the corrugation pitch finally obtained by the contact resistance with the pin 8 _-3 ) is on the outlet side. The distance becomes larger than twice the inter-pin distance Lo, and the phase shift of the waves occurs, so that pitch unevenness easily occurs.

The wave shape to be processed has a wave pitch Pw and a wave height H shown in FIG. Of these, the former is
It depends on the ratio between the number of revolutions of the corrugating device and the speed of the metal filament passing through it, but the latter is as shown in FIG.
It is affected by pin diameter, tension and bending angle α (see FIGS. 1 and 2).

The inventor has focused on the bending angle among these shape determining factors. That is, when the pin diameter and the tension are constant in FIG. 2, the wave height H increases as the bending angle α (= αo + αi) increases. Therefore, if the contact resistance of the outlet pin 8 _-3 is made as large as possible and the amount of twist propagating backflow between the pins 8 _-2 and 8 _-3 is made as small as possible, the pitch of the spiral corrugation generated during this period becomes large. I thought that the distance between pins could be expanded. However, if the pin-to-pin distance is constant (equal spacing), the bending angle αi on the inlet side due to the central pin 8 _-2 also becomes large, and the height H of the obtained wave becomes excessive.

Therefore, various experiments were conducted, and as shown in FIG. 1, the distance Li between the pins on the inlet side was changed to the distance Lo between the pins on the outlet side Lo.
And a smaller bending angle αi on the inlet side,
It has been found that the contact resistance of the outlet pin 8 _-3 can be increased without increasing the height H of the wave by keeping the total bending angle α of the metal filament within a target value. However, there is a lower limit to the bending angle αi on the inlet side. That is, when the inlet side bending angle αi is less than 2 °, the effect of the three pins weakens and approaches the situation of two pins, so that the contact state between the central pin 8 _-2 and the metal filament 1 becomes unstable. And the height H of the wave becomes unstable.

In this way, in order to increase the contact resistance of the outlet pin 8 _-3 , the distance L between the inlet pins in FIG.
The effect is small unless i is twice or more, more preferably 3 to 6 times, the distance Lo between the outlet pins.

Further, the distance Lo between the pins on the outlet side cannot be expanded indefinitely, and the corrugated pitch Pw to be obtained is obtained.
The limit is 0.85 times. In order to obtain a pitch unevenness prevention effect beyond this, the total bending angle α by the center pin 8 _-2 must be 50 ° or more, which not only lowers the corrugation efficiency. However, the contact resistance becomes abnormally high and the surface of the metal filament is damaged, which is not preferable. The lower limit of Lo is naturally 0.5 times the corrugation pitch Pw.

The device of the present invention is particularly effective when corrugation is performed at a pitch in the range of 3 to 8 mm. When the pitch is less than 3 mm, the distance Lo between the pins on the outlet side becomes insufficient especially when workability is taken into consideration. On the contrary, when it exceeds 8 mm, the pin arrangement pitches are all made equal and this pitch is corrugated. Since it is possible to correspond to 1/2 of the pitch Pw, it is not necessary to rely on the method of the present invention.

Further, the pin diameter is 1.2 to 3.0 mm.
Is preferable for the following reason. That is, when it exceeds 3 mm, as shown in FIG. 6, the corrugation efficiency decreases,
Further, since the tension increases due to the increase of the contact length with the metal filament, the tension of the supplier must be reduced correspondingly, which makes it difficult to control the tension. On the other hand, 1.
If it is less than 2 mm, it is difficult to secure the bending rigidity of the pin, and the pin is easily broken.

In addition to these, the rotary corrugating device 2 needs to rotate at high speed in order to perform fine corrugation. Therefore, bearings are provided on the inlet side and the outlet side so that both ends of the rotary shaft 4 are supported by the bearings. A double-sided structure supported by a cantilever structure is commonly used, but the present inventor believes that if the number of bearings is reduced to one, the cost of the device can be reduced and the wiring work can be speeded up. It was realized and succeeded in reducing the weight of the rotating shaft. In this case, the bearing 3 is preferably arranged on the incoming line side. If you place it on the exit side,
Since the metal linear body after corrugation is passed through the guide hole 6 formed at the center of the rotating shaft, contact between the two easily occurs due to vibration or the like, and the shape of the corrugated wave once changed ( The height H of the wave decreases.)

If the positions of the corrugated pins on the most inlet side and the most outlet side are arranged so that the center of the metal filament body 1 in contact with these pins is located on the center of the rotating shaft 4, the metal filaments are arranged. Before and after the body passes through the corrugating pin, the body does not vibrate on the same axis as the rotating shaft, so that a stable wave shape can be maintained.

[0021]

FIG. 4 shows an example of a rotary corrugating device of the present invention.

In the figure, the metal filament 1 is guided to the rotary corrugating device 2 after tension adjustment (not shown) at the supply source. This device 2 supports a rotating shaft 4 with a bearing 3 fixed to a frame, and rotates this shaft by transmitting power from a driving source such as an external motor via a driving pulley 5 attached to one end of the shaft. is there.

The metal linear member 1 is guided to the forming portion through a guide hole 6 which is provided through the center of the rotary shaft 4. The molding portion is constructed by integrally mounting a mounting portion 7 on the rotary shaft 4, and mounting three corrugated pins 8 _-1 , 8 _-2 , 8 _-3 on the side surface of the mounting portion 7. The corrugating pins 8 _-1 to 8 _-3 are orthogonal to the axis of the rotary shaft 4, and the outer diameter surfaces of the corrugating pin 8 _-1 at the inlet and the corrugating pin 8 _{-3 at} the outlet are the centers of the guide holes 6. Located on the outside by 1/2 of the diameter d of the metal filament with respect to the extension of the wire, the center corrugated pin _8-2 has a slightly staggered irregular position with respect to the former two pins. It is arranged to take.

Here, for the inter-pin distances Lo and Li in FIG. 1, Lo = 1 / 4Li, and in addition to Lo and FIG.
The relationship of the corrugation pitch Pw of was set to Lo = 0.67Pw. Furthermore, the pin diameter is 1.7 mm, and the center pin 8 _-2
The bending angle α of the metal filament is set to 50 ° or less.

After the metal filament 1 is drawn out from the guide hole 6 and undulated on the outer circumference of each of the pins 8 _-1 to 8 _-3 ,
It is wound up by a take-up device (not shown). Therefore, the rotating shaft 4
When the metal filament 1 is wound and moved in the direction of the arrow while rotating, the pins 8 _-1 to 8 that rotate together with the rotating shaft 4
_{By -3} , bending strain and twist due to rotation are applied to the metal filament 1, and a fine spiral wave 9 is attached to the metal filament after passing through the device.

FIG. 5 shows the results of examinations by examining the difference in the pitch unevenness generation region between the illustrated device and the conventional device in which the pin distance is constant (equal spacing). As can be seen from the above, the conventional apparatus has a considerably large corrugated pitch unevenness generation area, whereas the apparatus of the present invention has a significantly narrowed pitch unevenness generation area. The exemplified device was in the area shown as an implementation point in the figure, and no uneven pitch was observed in the test.

FIG. 6 shows the relationship between the bending angle α of the metal filament and the corrugation height H with the pin diameter as a parameter. Here again, the apparatus illustrated in FIG. 4 is shown as an implementation point. The pin diameter of this device is 1.7 mm, and when the bending angle α of the metal filament is 50 ° or less (about 30 °) when the corrugation height H = 0.25 mm, reasonable molding is possible. As a result, no damage was caused on the surface of the metal filament.

[0028]

As described above, in the rotary corrugating device of the present invention, among the inter-pin distances of a plurality of corrugating pins arranged, the distance between the most outlet side pins is shorter than the distance between other pins. It is possible to increase the contact resistance of the outlet pin without reducing the height of the wave to be formed, reduce the amount of backflow that is transmitted backflow between the two pins on the outlet side, and reduce the unevenness of the wave shape. . Further, by increasing the contact resistance of the outlet pin, the inter-pin distance can be expanded beyond 1/2 of the corrugation pitch to improve workability.

In particular, the distance Lo between the pins on the outlet side is regulated to be 0.5 times or less the distance Li between the other pins and 0.5 to 0.85 times the target corrugation pitch Pw. ,
Corrugation without pitch irregularity can be performed. Also, the diameter is 1.2 ~
In the case where the above condition is satisfied by using three 3.0 mm pins and the total bending angle α of the metal filament by the central pin is limited to 50 ° or less, the corrugation pitch is in the range of 3 to 8 mm. Even if the surface of the metal filament is prevented from being scratched, the workability can be improved and the spiral wave can be stably applied.

Therefore, a metal cord made by including at least one metal filament formed by the device of the present invention is
Not only good rubber permeability but also excellent quality, it is suitable as a reinforcing cord for automobile tires, high pressure hoses, conveyor belts, etc., where durability and safety are important.

[Brief description of drawings]

FIG. 1 is an explanatory view of corrugation by the device of the present invention.

FIG. 2 is an explanatory view of corrugation by a conventional device.

FIG. 3 is a diagram defining the shape of a spiral wave.

FIG. 4 is a schematic diagram of an example of a rotary corrugating device of the present invention.

FIG. 5 is a comparison diagram of pitch unevenness generation regions of the device of the example and the conventional device.

FIG. 6 is a diagram showing the relationship between the bending angle of a metal filament and the height of a wave using the pin diameter as a parameter.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Metal filament 2 Rotating corrugating device 3 Bearing 4 Rotating shaft 5 Driving pulley 6 Guide hole 7 Mounting part 8 _-1 to 8 _-3 Corrugating pin 9 Spiral wave

Claims (6)

[Claims] 1. An n-number (3 ≦ n ≦ 5) corrugated pins are attached in a zigzag arrangement on a rotary shaft that rotates around a wire passage position of a metal filament, and the metal filament is interposed between these pins. In a rotary corrugating device which passes a body and applies a fine spiral wave to a metal filament by bending with a pin and rotation of a rotary shaft, regarding the inter-pin distance of the corrugating pins, other than those of the two pins closest to the outlet side. A corrugating device for metal filaments, which is shorter than the pin-to-pin distance. 2. The rotary corrugating device for a metal filament according to claim 1, wherein the total number of corrugating pins is three, and the distance between the two pins on the outlet side satisfies the following equation. Lo ≦ 0.5Li and 0.5Pw ≦ Lo ≦ 0.85Pw where Lo: distance between two pins on the outlet side (mm) Li: distance between pins on the two inlet side (mm) Pw: obtained metal wire Spiral wave pitch 3. In FIG. 1, when the total bending angle α of the metal filament formed by the corrugated pin at the center is 50 ° or less, the inlet side bending angle αi
3. The rotary corrugating device for metal filaments according to claim 2, wherein the design is such that the angle is 2 ° or more. 4. The corrugated pin has a diameter of 1.2 to 3.0.
The rotating corrugating device for a metal filament according to claim 1, 2 or 3, wherein the corrugation is performed in a spiral wave pitch in the range of 3 to 8 mm for the metal filament. 5. The bearing according to claim 1, wherein the rotating shaft is supported by a bearing in a cantilevered state, and the cantilevered supporting portion is arranged on the wire insertion side of the corrugated pin mounting portion of the rotating shaft. Rotating corrugating device for metal filaments. 6. The corrugated pins, which are arranged in a zigzag arrangement, of the corrugated pins, wherein the pin on the most inlet side and the pin on the most outlet side are located at a position where the center of the metal linear body overlaps the axis of the rotating shaft when passing through. The arranged rotating corrugating device for metal filaments according to any one of claims 1 to 5.