Textiles: spinning – twisting – and twining – Apparatus and processes – Unitary multiple twist devices
Reexamination Certificate
1999-07-19
2001-10-02
Lindsey, Rodney M. (Department: 3765)
Textiles: spinning, twisting, and twining
Apparatus and processes
Unitary multiple twist devices
C057S058550, C057S311000, C057S902000
Reexamination Certificate
active
06295798
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for manufacturing a steel cord, and more particularly to a method and an apparatus for manufacturing a steel cord which is capable of enhancing the double twist pattern up to four times or six times compared to the prior art by arranging plural pairs of flyers to a twisting unit of the steel cord.
The steel cord is made of a plurality of metal filaments which are carbon steel containing 0.6 to 1.0 percent in weight of carbon and having diameters of 0.1 to 0.4 mm, and which are coated with brass of 0.1 to 0.4 in thickness. The steel filaments are twisted in various patterns according to its use, such as patterns of 1×2, 1×3, 1×4, 2+2, 3+6, and 3+9+15. The steel cord is superior to other inorganic fibers and organic fibers in terms of strength, modulus, thermal resistance, fatigue resistance, etc. Accordingly, the steel cord is primarily used as a reinforcing member for a rubber product, such as a tire.
Generally, the steel cord is manufactured as follows. Selected two or more steel filaments are twisted by the twisting unit of the braiding machine, discharged by the discharging unit, and then wound. The braiding machine for manufacturing the steel cord as mentioned above roughly comprises a filament supplying unit, a twisting unit for twisting a plurality of filaments supplied from the filament supplying unit, a discharging unit for discharging the twisted cord, and winding unit for winding the discharged cord under the fixed tension.
FIG. 1
shows an apparatus for manufacturing a double steel cord of the prior art. As shown in
FIG. 1
, there is provided a twisting unit including elements which rotate in the same direction and the same angular velocity, the rotating elements consisting of first turn roller
11
arranged at the inlet, second turn roller
12
arranged at the outlet, and a pair of flyers
9
,
10
arranged at the inlet and the outlet, respectively.
During the operation of the aforementioned apparatus, the rotating elements rotates counterclockwise in a view of direction from inlet to outlet.
More particularly, as shown in
FIG. 1
, steel filaments
2
wound on the steel filament bobbin
1
which corresponds to the aforementioned filament supplying unit, are unwound, pass through filament guide rollers
3
,
4
respectively, and combined by means of a guide roller
5
. The combined two steel filaments
2
is directed to the first turn roller
11
via a guide roller
6
. At this time, by the rotation of the flyers
9
,
10
at the area between the first turn roller
11
and the second turn roller
12
, the twist pitch is applied to the steel cord to form a twist pattern in one direction. Then the cord from the flyers
9
,
10
is guided to an overtwister
13
, a discharging capstan
14
, correcting unit
15
, and a guide roller
16
via the second turn roller,
12
. Finally, the cord is wound by means of a winding unit
17
.
In the apparatus for manufacturing steel cords, productivity depends on the twist pattern of the filaments formed by the twisting unit for twisting the filaments supplied from the filament supplying unit. However, the braiding machine of the prior art as mentioned above has problems that it is not possible to change the twist pattern easily since the twist patterns are predetermined as single or double pattern according to the inherent characteristic of each braiding machine. In order to solve the aforementioned problems, rotation number per minute is increased to advance productivity. However, it is not sufficient to maximize the productivity since increasing of rotation number per minute is limited.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a method and an apparatus for manufacturing a steel cord which overcome the aforementioned problems encountered in the prior art.
It is another object of the present invention to provide a method and an apparatus for manufacturing a steel cord which is capable of enhancing the productivity by making the apparatus in a manner of folding plural pairs of flyers in order to apply multiple twist to the steel cord.
According to the present invention, there is a method and an apparatus for manufacturing a steel cord which is capable of enhancing the double twist pattern of the steel cord up to six times by arranging plural pairs of flyers used to apply a further twist to a twisting unit of the steel cord, which are rotated relative to the twisting unit.
REFERENCES:
patent: 3828538 (1974-08-01), Yoshida et al.
patent: 4566261 (1986-01-01), Brandyberry et al.
patent: 4887421 (1989-12-01), Haislet
patent: 5285623 (1994-02-01), Baillievier et al.
patent: 5323596 (1994-06-01), Nguyen
patent: 5512380 (1996-04-01), De Vos et al.
patent: 5581990 (1996-12-01), Van Giel et al.
patent: 5784874 (1998-07-01), Bruyneel et al.
Bae Dal Hyang
Koh Ju Seok
Park Yong Min
Clark & Elbing LLP
Hyosung Corporation
Lindsey Rodney M.
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