JPH02234990A - Double twisting machine for manufacturing cord and manufacturing cord - Google Patents

Abstract

PURPOSE: To reduce excessive twisting by installing a round groove at least on one of exit pulleys of a double twisting machine and also enabling pivot rotation. CONSTITUTION: This double twisting machine for producing a cord is provided by installing a round groove at least on one pulley 31 of exit pulleys 23, 31 in the double twisting machine so as to have an inclined angle capable of being adjusted around a pot 32 substantially in parallel to the surface 4a, 4b for the transfer of the cord.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a coat 9 on a double twisting machine and to such a double twisting machine K.

Such a cord is of m+n type, which means that the cord consists of a core of m filaments and a layer of h filaments. Alternatively, such a cord may be of mXn type, meaning that the cord consists of m synthetic strands, each of which consists of n individual filaments.

Such coat 0 is a steel cord and is used for reinforcing rubber products such as pneumatic tires or rubber hoses. In this case, the filament is a scale filament. Carbon with a weight of between 0.70 and 0.90 cents has a tensile strength of more than 2700 N/■2 and a coating such as a brass alloy to aid in adhesion to the rubber. . Preferably, the steel filament has a round cross section with a diameter between 0.12 m and 0.40 wm.

It is common to make these cords with a double twister, since the double twister has advantages over single cylindrical stranders and single twisters in terms of output.

However, conventional yarn twisting machines have significant drawbacks.

The major drawback is. The cord made with a double twisting machine, the special K steel cord, has an extra weft. This means that the fraction of twist given to the cord is returned once the cord is made on the double twister.

The number of extra twists is equal to the number of turns made by the particular length of cord when one end is held in a fixed position and the other end is free to rotate. The number of extra twists is expressed in turns per meter.

This drawback of redundant twists has been eliminated in the prior art by providing a temporary twister rotating between the rotor of the double twister and the take-up unit.

The object of the invention is to provide a simple and energy-saving means of mitigating the disadvantages of redundant twisting. Another object of the invention is to reduce the number of redundant twists. According to one embodiment of the invention, a double twisting machine is provided for producing the cord, the twisting machine having a plurality of guide pulleys, one or more of which is an exit pulley). at least one of the outlet pulleys has a round groove at least in part;
characterized in that it has an adjustable angle of inclination relative to the plane of movement of the cord and about a pigget substantially parallel to this plane.

A double twisting machine is a machine that has a stator, a rotor, and a stationary cradle and provides two twists to the cord with each revolution of the machine's rotor. A typical double twisting machine is such that the direction of unwinding (i.e. the direction of movement of the unwound filament) is opposite the direction of winding (i.e. the direction of movement of the wound cord).

The rotor of a double twisting machine has two half shafts with or without a flyer. The winding unit of the double twister is located inside or outside the rotor of the double twister.

The guide pulley is a formed or already formed pulley that guides the cord and changes the path of the cord. The outlet pulley is a guide pulley located between the coaxial outlet (including the coaxial outlet) of the double twisting machine and the winding unit. one or more exit pulleys.

The outlet pulley located at the coaxial outlet of the double twisting machine is
It is fixed to the rotor and rotates at the same speed as the rotor, and the Kude Logogly is located further downstream and remains stationary.

A round groove means a groove that allows the cord to rotate beyond a certain rotational length depending on the diameter of the cord and the radius of curvature K of the groove.

The plane of movement is the plane determined by the direction of entry into the pulley and the direction of exit from the pulley.

A second embodiment of the invention has a plurality of guide pulleys,
One or more of them is a method for producing a cord f using a double twisting machine with an outlet pulley, wherein the inclination angle of the outlet pulley at least around a part of which has a round groove is coat 9 preset in a direction such that the cord is overtwisted beyond said exit pulley;
This is a manufacturing method.

The cord becomes overtwisted when the cord is twisted more than it is finally twisted by the pure double twister K.

After being overtwisted by the outlet pulley, the cord is also overwound in a falsifier before winding.

FIG. 1 is an overall view of a double twisting machine according to the invention K. It has the shape of a double twisting machine for making n m + n type cord.

The unwinding unit 2 is shown on the left side of the double twisting machine, and the winding unit 5 is shown on the right side of the machine. Here, the unwinding unit 2 has a pre-formed core wound thereon. Pin or creel. The unwinding unit 2 may also be another double twisting machine with m spools inside the rotor. In this method, a core with m filaments can be made in the same process as the completed cord.

A double twister has two half shafts.

One is a hollow inlet shaft 1, and the other is a hollow outlet shaft 24.
It is. These half shafts are supported by a fixed frame 211.29K and rotate at the same speed in bearings 26.27. Each axis is driven by a motor 30. The inlet shaft 1 has guide pulleys 12 and 21. The outlet shaft 24 has guide pulleys 14 and 23.

The guide pulley 23 is a guide pulley provided at the coaxial outlet of the double twisting machine. Gooley 23 is an exit pulley. Code 4 is another exit log before winding up.
Pass through 31. The two shafts 1 and 24 may be connected by two 7-layers 13 and 22,
This is not necessary.

A cradle l6 is supported statically in the double twister rotor by two bearings l7 and 18 and K. n sdales 19 are fixed to a cradle 16K.

A preformed core 1 is transferred from an unwinding unit 2 to an inlet shaft 1
1 and over the first guiding pulley 12 and the seventh layer 13 to the outlet shaft 24, where the direction of movement of the wick 1 is reversed past the second guiding pulley 14. Core 1 is Day! It goes beyond J-15 and reaches twisting head r20. The n filaments 3 of the layer are drawn out from the sdale 19 and integrated with the core 1 in the twisting heel P2o to form at least a partial cord 4. For code 4 movement directions, then the third guide Pooh! It is reversed beyond J-21 and guided to the exit shaft 24 through the 7-layer 22, passing through the fifth guide pulley 23 (first exit pulley) and 31 (second exit pulley) to the temporary twisting machine. Winding unit 5 over 25
Pass in the direction of.

The first and second guide pulleys 12 and 14 guide the core l into the double twisting machine K. Third, fourth and fifth guide pulleys 21
, 23.31 is a double twisting machine outside the cord 4.

In the conventional double twisting machine K, all of these guide gooles 12, 14, 21, 23 and 31 have a fixed support and a KV groove in the direction of movement of the core 1 or cord 4. In the double twisting machine K according to the invention K, the outlet pulley 31 is tiltable and has a round groove. By doing so, the outlet pulley 31 acts as a temporary twister as shown below.

The output pulley 23 also has a round groove when tilted to act as a twister.

Figures 2 and 3 show how the outlet pulley 31 with a round groove acts as a temporary lifter if the outlet pulley 31 is set at an angle to the moving plane K of the cord 4. shows. The cord 4 rolls down the sloped side of the groove. At this time, the wire will act as a temporary twist. In FIG. 3K, the S-shaped cord 4 is twisted before the pulley 31 and twisted back after the pulley 31.

In the case of type 2 cords, untwisting occurs before the pulley 31 and twisting occurs after the pulley 31.

The number of twists produced by cord 4Vc is determined by the tension of the two cords, the diameter of the cord, the shape of the groove in the pulley 31, and the angle αK at which the pulley is set. If the tension is too strong, the cord will not roll and will slip. Therefore, the small tension in the cord will cause the cord to roll and compensate for the twist.

The maximum number of twists that can occur in the code is. Since the length K of the inclined side surface of the groove divided by the diameter of the cord Y is equal, the smaller the diameter of the cord, the greater the number of twists that occur in the cord.

Since the radius of curvature of the groove determines the length of the sloped sides of the groove, the shape of the pulley groove, and in particular the radius of curvature of the groove, influences the number of twists that occur in the coat.

Is the angle α 061? If there is, no replenishment twist occurs in the code, and at an angle α different from O0, the code K results in a replenishment twist. The larger the angle α, the greater the number of twists produced, if there is sufficient stability.

Once the specified limit angle is exceeded, the f-Lee can no longer guide the cord. The exact value of this limit angle depends on the exact shape of the pulley groove and the tension K in the cord.

FIG. 4 shows the structure of the tiltable outlet pulley 31 in a double twisting machine according to the invention. The portion 4& of the cord 4 entering the pulley 31 and the portion 4b of the cord 4 exiting the pulley 31 form a surface. The pulley 31 is set at a certain angle with respect to this plane K. The pin around which the pulley 31 rotates to form the above-mentioned angle? The cut or axis 32 is substantially parallel to the plane K. The direction of inclination of the pulley 31 is such that the cord 4 is twisted in front of the pulley 31 and the cord 4 is twisted in front of the pulley 31.
selected to be returned later. If pulley 3
If the total number of twists given the code 4K before 1 is greater than the number of twists, the code will eventually have an excess of twists,
The surplus will be substantially reduced. This is explained as follows. Excess twisting occurs within the plastic strain range, and subsequent loosening occurs within the elastic strain range. The foregoing applies to known steel cords.

(3X0.20)+(6X0.35) 10/18
s/z This consists of a core consisting of 3 filaments (m=3) with a diameter of 0.20 m+ and a core consisting of 6 filaments (.
=6) filament layers. The twist length of the core is lO■ in the S direction, and the twist length of the cord itself is 18 m in the two directions. The core was made in advance. By using the tiltable outlet pulley 31, the number of redundant twists was reduced from 20 to 17 K per meter. In order to reduce the surplus upstream to zero, the speed of another tentative swing machine 25 was increased to 2 1 7 Or. p. A reduction in the number of redundancies of 1,000 yen, or a further reduction in the speed of the ergonomic machine of 15 arms and 1 cent in the construction of the 25 yen machine. means decrease.

The present invention provides a winding unit 5 located outside the rotor.
It is not limited to double twisting machines with
A double twisting machine K with a winding unit 5 located inside the rotor K as shown in the figure is also applicable. This is m
This is a structure for creating an xn type code. In this case, the pulley 31 and the outlet pulley 23 are tiltable and at least partially have a round groove.

The present invention is not limited to double twisting machines where only the outlet pulley 31 and the outlet pulley 23 can be tilted, but other guide pulleys such as the guide pulley 21 can also be tilted, allowing different types of twisting. K is preset so that the final length of filament is immediately withdrawn from the unwinding unit 2.

Although the problem of redundant twists is most severe in double twisters, the present invention applies to fixed twisters K as well as to tubular stranders K.

[Brief explanation of the drawing]

Figure 1 is an overall view of the double twisting machine according to the invention, Figures 2 and 3 are diagrams showing the method produced by Gooley K's cord, and Figure 4 is a diagram of the double twisting machine according to the invention. FIG. 5 is a structural diagram of the outlet pulley showing another double twisting machine according to the present invention. 4 m, 4 b...plane. 12.14, 21.2
3.31...Guide pulley 32...Pigat (shaft).

Claims (6)

[Claims] (1) A double twisting machine for producing cords, which has a plurality of guide pulleys (12, 14, 2
1, 23, 31), one or more of which is an outlet pulley (23, 31), and at least one outlet pulley (31) has a round groove in at least a part to facilitate the movement of the cord. For the surface (4a, 4b), and for this surface (4a
, 4b) for producing cords with an adjustable angle of inclination around a pivot (32) substantially parallel to. (2) The double twisting machine has a winding unit (5) located inside the rotor.
A double twisting machine for producing the cord described in Section 1. (3) The double twisting machine has a winding unit (5) located outside the rotor.
A double twisting machine for producing the cord described in Section 1. (4) The double twisting machine for producing a cord according to any one of claims 1 to 3, wherein the double twisting machine does not have a flyer. (5) Multiple guide pulleys (12, 14, 21, 23,
31), one or more of which has an outlet pulley (23,
31) A method for manufacturing a cord in which a double twisting machine is used, in which at least one outlet pulley (31) having at least a part a round groove is used and the plane of movement of the cord (4) ( 4a, 4b) and around a pivot (32) substantially parallel to this plane, the angle of inclination of said outlet pulley (31) is such that said cord is overtwisted beyond said outlet pulley (31). A method of manufacturing a cord that is preset in such a direction. (6) After the cord is excessively twisted beyond the outlet pulley (31), it is further twisted by a temporary twisting machine (2) before being wound up.
5) A method for producing a cord according to claim 5, which is over-stripped.