JPH01207488A - Twisting process for metal wire and apparatus therefor - Google Patents

Abstract

PURPOSE:To provide the title twisting process so designed that a torsion is regulated before double twisting and a good open cord is obtained in such a state as to have such a residual torsion that a wound cord can be used in the following process without any trouble. CONSTITUTION:A residual torsion regulator 22 is equipped on a cradle 16, and each element wire 2 delivered from each supply bobbin 11 is wrapped in 8-shaped manner round the both rollers 23 on said regulator 22, thus regulating the torsion. In order to utilize the portion of an over twister 17 as a forming device, increase in the rpm ratio of the over twister 17 to double twister 12 enables a cord 21 wound on a bobbin 13 to be made an open cord.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a metal wire I28vA method and apparatus used in manufacturing steel cords, etc., which are embedded in rubber products such as tires for reinforcement. be.

[Conventional technology]

In tires reinforced with steel cord,
If moisture intrudes into the rubber due to external damage to the tire or the like, the moisture will diffuse through the core of the cord, which is hollow in the case of ordinary steel cords.

As a result, a wide range of corroded areas are generated, causing corrosion, which in turn leads to a decline in the connection performance between the rubber and the cord, and significantly reduces the performance of tires and the like.

One way to prevent the widespread spread of rust as described above is to create a steel cord with a high stranding rate (hereinafter referred to as open cord).
is widely used.

That is, this is a method of enlarging the gaps between the strands of the outer cord layer and, during the manufacture of tires, etc., by allowing rubber to enter the core of the cord through the gaps between the strands, thereby closing the space in the core.

Further, when manufacturing the open cord as described above, a twisting device as shown in FIG. 2 is used.

In this device, 11 is a plurality of supply bobbins;
1 is a double twister, and 13 is a bobbin for winding open cord after twisting.

The above-mentioned double twister 12 includes a cradle 16 having a flyer 15 at both ends, which is provided with the supply bobbin 11, the molding device 14, and the voice 19.
is outside the cradle 16.

・6 The above-mentioned molding device 14 is as shown in FIGS. 3 and 4, and the one shown in FIG. It makes contact with the side. In addition, the one shown in FIG. 4 is one in which the strands 2 are inserted in a wavy manner through guide chips 4 provided on a plurality of battens 3, and in both cases, the shape, angle, and distance of the pins 1 and guide chips 4 are adjusted The desired molding is achieved by changing the shape.

In the above-mentioned conventional technology, each strand 2 fed out from each supply bobbin 11 is molded by a molding device 14 as shown in FIGS. 3 and 4, and then guided to a voice 19, passed through a guide roller 20, It is wound up onto a winding bobbin 13 via an over twister 17 and a winding capstan 18.

[Problem to be solved by the invention]

In the above process, as the rotation ratio of the over twister 17 to the double twister 12 is increased, the patterning of the strands 2 gradually becomes larger, and the oven cord-like wire 21
′ is obtained.

However, if you wind it up in this state, the code after winding it up will be
The remaining twist in the cord is so large that it cannot be used in the next process.

Therefore, in order to enable use in the next process, it is necessary to remove residual twist by twisting the fabric in a separate process after winding it up, thus requiring two processes.

Also, the typed bag mentioned above? Since the molding conditions change due to wear of the 1114 base 71 and the guide chip 4 over time, careful management of the pin 1 and the guide chip 4 is required to correct this.

The surfaces of the pins 1 and the guide tips 4 become rough due to wear, resulting in flaws on the surface of the strands 2 and replacement costs.

Particularly in the production of steel cords for reinforcing tires and the like mentioned above, the surface of the strands is plated on the order of submicrons in order to improve connectivity with rubber. The occurrence of flaws on the surface of the wire due to contact with the steel cord 1 or the guide chip 4 significantly deteriorates the quality of the steel cord.

An object of the present invention is to provide an apparatus for carrying out the 1ffi1 method and the Hoko method, which can obtain excellent open codes without using a typing device with various problems as described above.

[Means to solve the problem]

In order to achieve the above object, the method of the present invention uses a double twist type wire twisting machine in which a supply bobbin is provided inside a double twister and a winding device after twisting is provided outside the double twister. When overtwisting a wire after double-twisting the wire, increasing the number of revolutions of the overtwister compared to a normal cord (with a typing rate of around 100%) increases the patterning of the strands and creates an open cord. In this method, the twisted cord is adjusted before double twisting in order to bring the wound cord into a state in which it has a residual twist that can be used in the next process without any problems.

In addition, in the device of the present invention, the supply bobbin is provided inside the double twister, and the winding device after twisting is provided outside the double twister. In a device in which the number of wires is increased compared to that of a normal cord (with a typing rate of around 100%), the patterning of the strands is increased and an open cord is created, and a twist adjustment device is installed in the double twister. The cord is attached to give the cord wound by the winding device a residual twist that can be used in the next process without any trouble.

It is effective if the twist adjustment device is of an over-twister type and configured to rotate in the opposite direction to the rotational direction of the double twister.

〔Example〕

FIG. 1 shows an embodiment of the present invention, in which a residual twist adjustment device 22 is used instead of the conventional shaping device 14 shown in FIG.
This device is unique in that it is attached to the cradle 16, and other points are the same as the conventional example shown in FIG.

An example of the residual twist adjustment device 22 is an over-twister type in which a pair of rotating rollers 23 are arranged on a rotating frame 24 that rotates in the opposite direction to the double twister 12. After being wound in a figure 8 shape around both rollers 23 of the twist adjustment device 22 to adjust the twist, it passes through the guide roller 20, passes through the over twister 17 and the take-up capstan 18, becomes the open cord 21, and becomes the wind-up bobbin 13. It is rolled up.

In the above device, it is preferable that a transmission is incorporated into the drive means of the torsion adjusting device 22 in order to easily adjust its rotational speed.

In the above, in order to utilize the overtwister 17 portion as a molding device, the overtwister ratio, that is,
By increasing the rotation speed ratio of the over twister 17 to the rotation speed of the double twister 12, the winding bobbin 13
The cord 21 that is rolled up can be an open cord.

In the graph of Fig. 5, the vertical axis is the torsion torque, and the horizontal axis is the number of twists, twist pitch, and residual twist. p, m)B Niover twister (in the cradle) rotation speed (normal patterning, twisting pitch given,
and the number of rotations that gives the cord residual twist of 0)B'
Number of rotations of the bar twister (number of rotations that give an open cord pattern) BIB' Normally, the supplied strands are twisted to a predetermined number of twists of 2A by a double twister, but if this is wound up as is, its history will be the fifth OD→E in the figure, and the cord wound onto the winding bobbin has a residual twist equivalent to one twist, and when this twist is released after shading, the number of twists becomes σ 壬.

In order to set this to a predetermined number of twists of 1, an overtwister is used to add a rotational speed B such that PQ=R3, and further to return the rotational speed B.

That is, the history in this case becomes 0→D-4E-F→Q, and a product with a predetermined number of twists and no residual twist is obtained.

In the case of this invention, the number of revolutions of the overtwister is further increased to increase the patterning of the strands (history 0-D-E in Fig. 5).
-F-G→Q), the code is 5 immediately after winding.
There is a residual twist equivalent to 1, so it is necessary to unscrew it.

As in this invention, if a residual twist adjustment device such as an over-twist system is provided and the device is rotated in the opposite direction to the double twister body by an amount corresponding to the residual twist of the strand, the history of the twisted wire in this case is 0-4D-4E-4F-4
G→S.

In other words, the number of twists becomes larger than [σn] and smaller than the twist pitch determined by a double twister. Therefore,
In order to obtain a predetermined twisting pitch, the speed of the take-up capstan must be increased, making it possible to increase the speed compared to the conventional method.

〔Effect of the invention〕

Since the present invention is a method as described above, by simply adjusting the twist before double-twisting the strands, it is possible to omit the need for pins and battens as shaping devices as in the conventional wire twisting method.

Therefore, there is no need for changes in shaping conditions due to wear of the pins and guide tips of the battens over time, and careful management to prevent this. Problems such as surface scratches are completely eliminated.

In particular, in the case of reinforcing steel cords for rubber tires, etc., the surface of the wire is plated on the order of submicrons in order to enhance the adhesion effect between the rubber and the cord, but when such plating is present, surface flaws are less likely to occur. However, in the case of the present invention, such a fear is completely eliminated, although the adhesive effect is significantly deteriorated and the quality is significantly lowered.

In addition, compared to the conventional method, the speed amplifier is increased,
-Productivity is improved because open cords can be twisted in the process.

Furthermore, the residual twist can be untwisted by installing a torsion adjusting device such as an over-twister type inside the double twister and rotating it in the opposite direction to compensate for the residual torsion, so there is no need for a separate untwisting device. There are effects such as

[Brief explanation of the drawing]

FIG. 1 is a side view showing an example of an apparatus for carrying out the method of the present invention, FIG. 2 is a side view of a conventional device, FIG. 3 is a perspective view showing the main parts of a conventional pin-type molding device, and FIG. The figure is an enlarged longitudinal sectional side view showing the main parts of the batten type, and FIG. 5 is a graph showing the relationship between torsion torque, number of twists, twist pinch, and residual twist. 2...Element wire, 11...Supply bobbin, 12...Double twister, 13...Wind-up bobbin, 14...Twist adjustment Device, 17...Over twister, 18...Take-back capstan, 21...Open cord.

Claims (3)

[Claims] (1) After double-twisting the assembled strands using a double-twist type twisting machine in which the supply bobbin is installed inside the double twister and the winding device after twisting is installed outside the double twister, the assembled wires are double-twisted and then overtwisted. In this case, the rotation speed of the overtwister is set to the normal code (type rate is around 100%).
In the method of making an open cord by increasing the patterning of the strands by raising the wire higher than in the case of , the above-mentioned A metal wire twisting method characterized by adjusting the twist before double twisting. (2) When installing the supply bobbin inside the double twister, installing the winding device after twisting the wire outside the double twister, and performing overtwisting after double twisting the collected wires, the rotation speed of the overtwister should be adjusted to the normal speed. In a device that increases the patterning of the strands and creates an open cord by increasing the patterning rate above that of the cord (nearly 100%), a twist adjustment device is installed in the double twister, and the A metal wire twisting device characterized in that a cord wound by a winding device is given a residual twist that can be used without trouble in the next process. (3) The metal wire twisting device according to claim (2), wherein the twist adjustment device is of an over-twister type and rotates in a direction opposite to the rotational direction of the double twister.