JP2008063703A - Wire twisting machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire twisting machine for producing a multilayer cord by twisting a plurality of side wires around a rubber-coated core and completely filling the gap between the core and an outer layer composed of the side wires with a rubber, having a simple mechanism, installable in a small space and saving electric power in operation. <P>SOLUTION: A plurality of bobbins 7 are attached to a rotary shaft 2 having a through-hole 1 interposing a brake mechanism in an independently rotatable state, guide rollers 25, 26 integrally rotating with the rotary shaft 2 are placed at one part around each bobbin 7 at a position staggered in the rotation direction for each bobbin 7, and a comber board 27 integrally rotating with the rotary shaft 2 is placed at the end of the shaft 2. A rubber-coated core C is supplied through the through-hole 1 of the rotary shaft 2, and side wires S are drawn out from the bobbins 7 associated with the rotary shaft 2, passed through the holes of the comber board 28, collected around the core C with a die 28 and twisted together by bundling and applying twisting torque to the side wires. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a stranded wire machine for producing a stranded wire (cord) such as a steel cord, in particular, by arranging a plurality of side wires made of a single wire or stranded wire around a rubber-coated core made of a single wire or stranded wire. The present invention relates to a twisting machine for producing a multi-layer cord to be twisted.

Buncher type and tubular type twisting machines are known as apparatuses for manufacturing twisted wires such as steel cords used for tire reinforcements (see, for example, Patent Document 1). The steel cord for tire reinforcement is a single layer cord with a single core structure (1 x m structure) without twisting 3-6 strands (steel filaments) or three core filaments, for example. A core strand is formed, 8 sheath filaments are arranged around the core strand, and a plurality of strands (steel filaments) such as a 3 + 8 structure formed by twisting the core strand with different twist directions or twist pitches are formed. Two-layer twisted structure (m + n structure) or other multi-layer cords twisted on the inner and outer two layers. These single-layer or multi-layer steel cords are generally manufactured by the buncher-type or tubular-type twist wire machine. Yes.
JP-A-57-193253

  By the way, when a steel cord for reinforcing tires has a multi-layer structure, a core made of a single wire or a stranded wire is covered with unvulcanized rubber, and a plurality of wires made of a single wire or a stranded wire around the rubber-coated core. Attempts have been made in the past to make steel cords in which the gap between the core and the outer layer (sheath) composed of the side wires is filled with unvulcanized rubber by arranging and twisting the side wires. In this way, a steel cord having a plurality of structures in which the gap between the core and the outer layer is filled with unvulcanized rubber is embedded in the rubber of the tire body at the time of tire molding, for example, as a tire reinforcing material. Sulfurized, the gap between the core and the outer layer is completely filled with rubber, so that fretting wear does not occur, corrosion from the inside of the cord due to moisture etc. is prevented and the fatigue resistance of the steel cord is improved The life of rubber products such as tires can be extended.

  However, in the production of multi-layer cords in which a plurality of side wires are arranged and twisted around the rubber-coated core in this way, if a conventional twisted wire machine such as a buncher type or a tubular type is used, The rubber is easy to peel off before reaching the (aggregation part), and a gap that is not filled with rubber remains in the cord after twisting, and there is a limit to improvement in product quality. In a buncher type twisted wire machine, the rubber coated core is also twisted, so that the uniformity of the rubber is lost until the core is twisted. In addition, in the tubular type stranded wire machine, although the twist is not applied to the core, the rubber is easily peeled off because it is rubbed while passing through a long guide path or the like to the gathering portion. And since these types of stranding machines are designed to pull out a steel filament around a reel or bobbin for a long distance and rotate it, a guide to prevent swelling due to centrifugal force is necessary, and the mechanism is complicated. In addition to the large-scale equipment, there is a problem that the air resistance due to rotation of the guides and the like is large and the power consumption is large.

  The present invention can manufacture a multilayer cord in which a plurality of side wires are arranged and twisted around a rubber-coated core, and a gap between the core and the outer layer composed of the side wires is completely filled with rubber. An object of the present invention is to provide a twisting machine that is simple and can save space and power.

  The stranded wire machine of the present invention is a stranded wire machine for producing a multilayer cord in which a plurality of side wires made of single wires or stranded wires are arranged and twisted around a rubber-coated core made of single wires or stranded wires. A drive-type rotating shaft having a through-hole for supplying a core in the shaft core portion, a bobbin row comprising a plurality of side-line feeding bobbins rotatably mounted on the rotating shaft, and each of the bobbin rows Bobbin equipped with a brake mechanism that brakes relative rotation between the bobbin and the rotating shaft, supplying a rubber-coated core through the through hole of the rotating shaft, driving the rotating shaft, and interlocking with the rotating shaft via the brake mechanism A side line is drawn out from each bobbin in the row, and the drawn out side lines are arranged around the core and twisted together.

  More specifically, this twisting machine is, for example, a guide roller for drawing a side wire that is installed at a position shifted in the rotation direction for each bobbin at each location around each bobbin in the bobbin row and rotates integrally with the rotating shaft. And a guide roller for side line supply that is installed in a position parallel to the axis of the rotation axis with respect to each guide roller around each bobbin in front of the core supply direction of the bobbin row, and rotates integrally with the rotation axis, A side line is drawn from each bobbin of the bobbin row via a guide roller for drawing out the side line, and the side line is supplied via a guide roller for supplying the side line. In this case, a plurality of side lines supplied through a guide roller for supplying side lines is passed through a predetermined arrangement on the rotation shaft, and the eye plate rotates integrally with the rotating body. Board A gathering part that gathers a plurality of side lines through the hole around the core, and a twisting mechanism that binds and twists the plurality of side lines gathered at the gathering part around the core, via a guide roller for supplying the side line The side wires supplied in this way are passed through the holes in the eye plate, gathered around the core at the gathering section, and the bundle of side wires gathered around the core is twisted by applying a twisting torque by a twisting mechanism. Configure to match.

  According to this twisting machine, a core covered with rubber in advance is supplied through the through hole of the rotating shaft, and a plurality of side wires are loaded with a predetermined tension from each bobbin of the bobbin row interlocked with the rotating shaft via the brake mechanism. In this state, it is fed out, and the drawn out side wires are arranged around the core and twisted together to be sent out as a multilayer cord. At that time, the core is simply supplied straight and is not twisted, and only the side wires are twisted and twisted together. Therefore, there is no peeling of rubber due to twisting of the core as in the conventional buncher type twisting machine, and there is no peeling of rubber due to rubbing along a long guide path as in the tubular type twisting machine. A uniform coating layer of rubber can be maintained around the core, and a multilayer cord can be produced in which the gap between the core and the outer layer is completely filled with rubber, including a completely closed two-layer twisted steel cord . The twisting machine has a simple mechanism and can save space and power as compared with a conventional buncher type or tubular type twisting machine.

  As described above, the twisting machine of the present invention is a multilayer cord in which a plurality of side wires are arranged and twisted around a rubber-coated core, and the gap between the core and the outer layer composed of the side wires is completely filled with rubber. In addition, the mechanism is simple, and space saving and power saving are possible.

  1 to 3 show an example of an embodiment of the present invention. FIG. 1 is a diagram showing a main part configuration of a stranded wire machine, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is a partially enlarged view of FIG.

  The strand wire machine of this embodiment is composed of, for example, three steel filaments (single wire) for tire reinforcement twisted into a single layer and covered with rubber, around a core of 1 × 3 structure, and eight steel wires as side wires. This is a stranded wire machine arranged in-line in a tire production line in order to produce a two-layer stranded steel cord having a 3 + 8 structure by arranging filaments (single wires) and twisting them.

  This stranded wire machine is provided with a rotating shaft 2 having a through-hole 1 for supplying a core that penetrates the shaft core part from the front end to the rear end over the entire length. The rotary shaft 2 has a shaft main body portion at the front portion and a support portion at the rear portion, and the support portion is rotatably supported by the fixed base 4 via the bearing portion 3, and is driven at the front end (rear end) of the support portion. The pulley 5 is fixed. The rotating shaft 2 is belt driven by an electric motor (not shown) via a pulley 5. The shaft body portion of the rotating shaft 2 is provided with a bobbin row comprising eight side line feeding bobbins 7 that are individually supported through a pair of bearings 6 and mounted independently in a freely rotatable state. It has been.

  Each pair of bearings 6 that support each bobbin 7 is fixedly supported by an inner sleeve 9 for each bobbin 7 in which a bearing inner 8 is fitted and fixed to the outer periphery of the rotary shaft 2, and a bearing outer 10 is provided inside the bobbin 7. It is fixedly supported on the inner periphery of the outer sleeve 12 of each bobbin 7 that is fitted around the periphery and the bobbin 7 is positioned and fixed by the knock pin 11.

  Each outer sleeve 12 has a cylindrical radial direction that opens to the inner surface side at a center portion sandwiched between bearing support portions at both ends whose inner diameter supporting the bearing outer 10 of the pair of bearings 6 expands in a stepped shape. A cylindrical brake in which the lower end surface is curved in an arc shape in close contact with the outer periphery of the inner sleeve and the upper end surface is inclined in one direction. The piece 14 is held so as to be slidable up and down, and has a threaded portion on the opening side in a cylindrical shape that opens to the end surface of the bearing support portion on one end side, extends to the center portion, and communicates with the sliding hole 13 in the radial direction. An axial adjustment hole 15 is formed. In the axial adjustment hole 15, the lower surface constitutes a wedge surface 16 in a lateral state, and the wedge surface abuts on the inclined upper surface of the brake piece 14 to attach the brake piece 14. Inners A rod-like brake pressurizing jig 17 that pressurizes toward the outer periphery of the tube 9 is held slidably in the axial direction, and the brake pressurizing jig 17 is pressed in the axial direction so that the brake piece on the rust surface 16 A brake force adjusting spring 18 and a brake force adjusting screw 19 are disposed so as to adjust the brake force by adjusting the contact position with the brake 14. These constitute a brake mechanism that brakes the relative rotation between each bobbin 7 of the bobbin row and the rotary shaft 2.

  In addition, rotating brackets 20 and 21 are fixed to the shaft main body portion of the rotating shaft 2 at the front and rear of the bobbin row, and the front surface portion is configured by the frame member 22 via the front and rear rotating brackets 20 and 21. A bowl-shaped rotating case 24 whose surface portion is constituted by a drum member 23 is disposed so as to rotate integrally with the rotating shaft 2 so as to cover the bobbin row. In the bowl-shaped rotating case 24, a guide for side line drawing is provided on the peripheral surface portion formed by the drum member 23 at a position shifted in the rotation direction for each bobbin 7 at one location around each bobbin 7 in the bobbin row. The roller 25 is installed, and the front side of the frame member 22 is arranged in the direction parallel to the axis of the rotary shaft 2 with respect to each guide roller 25 around each bobbin 7 in front of the core supply direction of the bobbin row. Thus, a guide roller 26 for supplying the side line is installed.

  Further, the rotary shaft 2 has a hole through which a plurality of side lines S supplied through the guide roller 26 are passed in a predetermined arrangement at a shaft tip portion located in front of the core supply direction of the side line supply guide roller 26. The eye plate 27 is disposed and fixed so as to rotate integrally with the rotary shaft 2.

  A die 28 (aggregation part) for assembling the eight side lines S through the holes in the eye plate 27 around the core C is disposed in front of the core supply direction of the eye plate 27, and the die 28 is disposed in front of the die 28. An over-twist roller 29 (twisting mechanism) for bundling the eight side lines S passed around the core C and applying a twisting torque is disposed, and a capstan 30 (take-up mechanism) is disposed further forward. Note that a correction roller for adjusting the shape of the steel cord SC in which the bundle of the side wires S is twisted and twisted by the over twist roller 29 may be disposed between the over twist roller 29 and the capstan 30. Although not shown, a take-up reel (winding mechanism) is provided before the capstan 30. It is also possible to directly connect to a calendar process (a process of sandwiching a cord between rubber sheets) without winding on a take-up reel.

  In this stranded machine, for example, a core C having a 1 × 3 structure coated with rubber is supplied through the through hole 1 of the rotary shaft 2. Then, the rotary shaft 2 is driven, the over twist roller 29 and the capstan 30 are driven, and each side line S is pulled out from each bobbin 7 of the bobbin row via the guide roller 25 for side line drawing, and the eight drawn out The side lines S are supplied through the corresponding guide rollers 26 for supplying side lines and arranged around the core C, and the eight side lines S supplied through the guide rollers 26 for supplying side lines are viewed. A two-layer stranded steel cord SC having a 3 + 8 structure is manufactured by passing it through a hole in the plate 28 and gathering it around the core C with a die 28 to form a bundle and twisting it by applying a twisting torque with an over twist roller 29. At that time, the core C and the eight side lines S are taken up by the capstan 30 and sent forward in the supply direction. Each bobbin 7 is interlocked with the rotary shaft 2 by balancing the tension applied to the side line S and the braking force. The brake force can be adjusted for each bobbin 7 by the brake force adjusting screw 19. The tension of the side line S fed out from each bobbin 7 is kept constant by adjusting the braking force.

  According to this twisting machine, the core C is simply supplied straight, the twist is not loaded, and the side wire S can be twisted around the core C while maintaining a uniform coating layer of rubber. it can. Therefore, it is possible to manufacture a steel cord in which the gap between the core C and the outer layer composed of the side lines S is completely filled with rubber.

  In the example shown in the figure, eight side line feeding bobbins 7 are mounted on the rotating shaft 2, but the number of bobbins 7 mounted on the rotating shaft 2 is appropriately changed within a range of 2 to 9, for example. it can. The number of steel filaments (single wires) constituting the core C can be changed as appropriate within a range of 1 to 4, for example.

  Moreover, the strand wire machine of the said embodiment is a side wire around the core of 1 * 3 structure which twisted the rubber | gum by twisting, for example, three steel filaments (single wire) for tire reinforcement into a single layer. Is a stranded wire machine arranged in-line in a tire production line in order to manufacture a two-layer stranded steel cord having a 3 + 8 structure by arranging and twisting steel filaments (single wires), but the present invention is limited to this Instead, a core made of a single wire or a stranded wire (a cord in which a plurality of single wires are twisted, a cord in which a plurality of cords are twisted, or a cord in which a cord and a single wire are twisted) is covered with unvulcanized rubber. , A single wire or a stranded wire around the rubber-coated core (a cord in which a plurality of single wires are twisted, a cord in which a plurality of cords are twisted, or a cord in which a cord and a single wire are stranded) ) A plurality of side tracks can be applied to the stranding machine generally twisted to array of.

It is a figure which shows the principal part structure of the strand wire machine of embodiment of this invention. It is AA sectional drawing of FIG. It is the elements on larger scale of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Through hole 2 Rotating shaft 3 Bearing part 4 Fixing base 5 Pulley 6 Bearing 7 Bobbin 12 Outer sleeve 13 Sliding hole 14 Brake piece 15 Adjustment hole 16 Wedge surface 17 Brake pressure jig 18 Brake force adjustment spring 19 Brake force adjustment screw 25 Guide roller for drawing out the side line 26 Guide roller for supplying the side line 27 Eye plate 28 Die (aggregation part)
29 Over twist roller (torsion mechanism)
30 Capstan (feed mechanism)

Claims (3)

A stranded wire machine for manufacturing multi-layer cords, in which a plurality of side wires made of single wires or stranded wires are arranged and twisted around a rubber-coated core made of single wires or stranded wires, for supplying a core to the shaft core portion A drive-type rotary shaft having a through-hole, a bobbin row comprising a plurality of side-line feeding bobbins rotatably mounted on the rotary shaft, and a relative relationship between each bobbin of the bobbin row and the rotary shaft The bobbin train having a brake mechanism for braking rotation, supplying the rubber-coated core through a through hole of the rotary shaft, driving the rotary shaft, and interlocking with the rotary shaft via the brake mechanism A twisting machine characterized in that a side wire is fed out from each of the bobbins and a plurality of the drawn side wires are arranged around the core and twisted together. A guide roller for drawing a side wire that is installed at a position shifted in the rotational direction for each bobbin at each one of the bobbin rows around the bobbin row, and that rotates in unison with the rotary shaft, and in front of the bobbin row in the core supply direction. A guide roller for supplying a side line that is installed at a position parallel to the axis of the rotating shaft with respect to each guide roller around each bobbin and rotates integrally with the rotating shaft, and from each bobbin in the bobbin row The twisted wire machine according to claim 1, wherein the side wire is drawn out through a guide roller for drawing out the side wire, and the side wire is supplied through the guide roller for supplying the side wire. A plurality of side lines that are supplied via the side line supply guide roller in a predetermined arrangement in front of the core supply direction of the side line supply guide roller in a predetermined arrangement; A front part in the core supply direction of the eye plate, a collection part for gathering a plurality of side lines through the holes of the eye board around the core, and a plurality of the side lines gathered in the gathering part around the core A plurality of side lines supplied via the side line supply guide rollers are assembled around the core at the gathering portion through the holes of the eye plate, and are twisted around the core. The stranding machine according to claim 2, wherein a bundle of a plurality of side wires assembled together is twisted by applying a twisting torque by the twisting mechanism.

Images