Patent ID: 12227034

DETAILED DESCRIPTION

Overview of Embodiments of the Present Invention

Firstly, the overview of embodiments of the present invention is described.

(1) A cable bead comprising an annular core and a side wire spirally wrapped up around the annular core, wherein the annular core is made up of a round steel wire made to circle once or made, without being stranded, to circle 2 to 10 times side by side, and wherein the side wire is a round steel wire consecutive from the annular core.

According to configuration (1), since an annular core is made up of a round steel wire made to circle once or made, without being stranded, to circle 2 to 10 times side by side, a cable bead has its transverse section in a substantially circular or oblate shape. This allows a tire main body to be put into contact with a wheel in a uniform area or a large area. Additionally, by adjusting circling in number between 1 and 10 for a round steel wire making up an annular core, a substantially circular shape is allowed to be adopted or an oblateness ratio (an aspect ratio, in a case of a substantial elliptical shape) of an oblate shape is allowed to be adjusted, and contact area is allowed to be controlled. Furthermore, since a side wire is a round steel wire making up an annular core and is spirally wrapped up around the annular core consecutively without being cut out of the annular core, a cable bead can be highly reinforced, and besides, an annular core and a side wire do not need to be manufactured in discrete process steps, and therefore, high productivity is achieved. Therefore, according to (1), a high-strength cable bead that can press a tire main body against a wheel without fail even if a tire is charged with a high load can be realized at a low price.

(2) A cable bead according to (1), wherein the side wire is laminated in a plurality of layers around the annular core, and wherein the side wire in layers adjacent to each other is wrapped up in directions opposite to each other.

According to configuration (2), a cable bead is allowed to be further highly reinforced.

(3) A cable bead according to (1) or (2), wherein the cable bead meets, with respect to tire width direction-inner cable bead ring radius Di (mm), tire width direction-outer cable bead ring radius Do (mm), and cable bead sectional maximum width Wm (mm), a relation of 0≤(Do−Di)/Wm≤√3/2.

According to configuration (3), as shown inFIG.1, a cable bead whose transverse section is in an oblate or a substantially elliptical shape is allowed to be adjusted between a level and a slanted forms in accordance with a flange shape of a rim portion of a tire wheel within a scope of the present invention, by adjusting tire width direction-inner cable bead ring radius Di (mm) with respect to tire width direction-outer cable bead ring radius Do (mm) between an equal value and a smaller value within a scope of the invention. Since a tire main body can be, as a result, firmly put into tight contact with a wheel rim by a cable bead, a cable bead suitable for tires for vehicles having their tires charged with high loads, such as large-size passenger cars, trucks, buses, aircrafts, construction/mining vehicles can be provided. Additionally, a cable bead suitable for tires for bicycles having their tires charged with high loads because having motor assistance features added and further because being frequently loaded with a child, luggage, and so on in their front and rear parts can be provided.

(4) A cable bead according to (1) or (2) or (3), wherein the round steel wire contains carbon at 0.57 mass % or more.

According to configuration (4), a cable bead is allowed to be further highly reinforced.

(5) A cable bead according to (4), wherein the round steel wire is treated by being plated with brass, plated with bronze, or coated with zinc phosphate.

According to configuration (5), a cable bead is enhanced in adhesion to tire rubber, or in corrosion resistance and economic efficiency.

(6) A cable bead according to (4), wherein the round steel wire is, after being drawn, treated by being blued, treated by being plated with brass, treated by being plated with bronze, or treated by being coated with zinc phosphate.

According to configuration (6), a cable bead is allowed to be enhanced in adhesion to tire rubber, or in durability and stretch characteristics, and besides, to be enhanced in stability in assembly into a wheel rim.

(7) A cable bead according to any of (1) to (6), wherein an end portion of the round steel wire is constrained with a metal jig having a surface property of enabling adhesion to tire rubber to be made through vulcanization.

According to configuration (7), a round steel wire end portion is allowed to be constrained without hindering adhesion to tire rubber of the round steel wire end portion, by selecting, when manufacturing a cable bead, a method of constraining the round steel wire end portion with a sleeve tube or a splice or a metal foil, made of brass or bronze or copper or the like, or, a metal sleeve tube or a splice or a metal foil or the like, treated with brass plating, or bronze plating, or copper plating, and a tire burst or the like during fast running or the like is repressed by such means as preventing a bead from peeling off from tire rubber, and extremely high effect of enhancing safety is achieved.

(8) A cable bead according to any of (1) to (6), wherein an end portion of the round steel wire is constrained with an adhesive agent.

According to configuration (8), by constraining, when manufacturing a cable bead, an end portion of a round steel wire with an adhesive agent or the like, a method simpler than that of constraining it by inserting a terminal into a brass sleeve tube or the like, and even an attempt to save labor, such as automation are allowed to be realized, and therefore, an extremely high economic efficiency effect is achieved.

(9) A tire comprising a tire main body provided with a bead portion, and a wheel to an outer circumference side of which the tire main body is attached, wherein the bead portion is attached to the wheel by a cable bead according to any of (1) to (8).

According to configuration (9), a tire main body is firmly put into tight contact with a wheel rim by a cable bead, and therefore, a tire suitable for vehicles having their tires charged with high loads, such as large-size passenger cars, trucks, buses, aircrafts, construction/mining vehicles can be provided. Additionally, a tire suitable for bicycles having their tires charged with high loads because having motor assistance features added and further because being frequently loaded with a child, luggage, and so on in their front and rear parts can be provided.

(10) A cable bead manufacturing method comprising an annular core formation process of forming an annular core by making a round steel wire circle once or by making it, without stranding it, circle 2 to 10 times side by side, and a side wire wrapping process of spirally wrapping up a round steel wire consecutive from the annular core around the annular core without cutting it.

According to configuration (10), since an annular core is formed out of a round steel wire made to circle once or made, without being stranded, to circle 2 to 10 times side by side, a cable bead has its transverse section in a substantially circular or oblate shape. This allows a tire main body to be put into contact with a wheel in a large area. Additionally, by adjusting circling in number between 1 and 10 for a round steel wire making up an annular core, a substantially circular shape is allowed to be adopted or an oblateness ratio (an aspect ratio, in a case of an elliptical shape) of an oblate shape is allowed to be adjusted, and contact area is allowed to be controlled. Furthermore, since a side wire is a round steel wire making up an annular core and is spirally wrapped up around the annular core consecutively without being cut out of the annular core, a cable bead can be highly reinforced, and besides, an annular core and a side wire do not need to be manufactured in discrete process steps, and therefore, high productivity is achieved. Therefore, according to (10), a high-strength cable bead that can press a tire main body against a wheel without fail even if a tire is charged with a high load can be manufactured at a low price.

(11) A cable bead manufacturing method according to (10), wherein the side wire wrapping process is a process of wrapping up a round steel wire in layers adjacent to each other around the annular core in directions opposite to each other in a plurality of layers.

According to configuration (11), a higher-strength cable bead can be manufactured.

(12) A cable bead manufacturing method according to (11), wherein the side wire wrapping process is a process of wrapping up one layer and then wrapping up, by constraining, on a side toward the annular core, an end portion of a round steel wire in the one layer or a vicinity of that end portion, a following one layer.

According to configuration (12), a higher-strength cable bead can be manufactured.

(13) A cable bead manufacturing device comprising an annular core formation mechanism of forming an annular core by making a round steel wire circle once or by making it, without stranding it, circle 2 to 10 times side by side, and a side wire wrapping mechanism of spirally wrapping up a round steel wire consecutive from the annular core around the annular core without cutting it.

According to configuration (13), since an annular core is formed out of a round steel wire made to circle once or made, without being stranded, to circle 2 to 10 times side by side, a cable bead has its transverse section in a substantially circular or oblate shape. This allows a tire main body to be put into contact with a wheel in a large area. Additionally, by adjusting circling in number between 1 and 10 for a round steel wire making up an annular core, a substantially circular shape is allowed to be adopted or an oblateness ratio (an aspect ratio, in a case of an elliptical shape) of an oblate shape is allowed to be adjusted, and contact area is allowed to be controlled. Furthermore, since a side wire is a round steel wire making up an annular core and is spirally wrapped up around the annular core consecutively without being cut out of the annular core, a cable bead can be highly reinforced, and besides, an annular core and a side wire do not need to be manufactured in discrete process steps, and therefore, high productivity is achieved. Therefore, according to (13), a high-strength cable bead that can press a tire main body against a wheel without fail even if a tire is charged with a high load can be manufactured at a low price.

(14) A cable bead manufacturing device according to (13), wherein the side wire wrapping mechanism is a mechanism of wrapping up a round steel wire in layers adjacent to each other around the annular core in directions opposite to each other in a plurality of layers.

According to configuration (14), a higher-strength cable bead can be manufactured.

(15) A cable bead manufacturing device according to (14), wherein the side wire wrapping mechanism is a mechanism of wrapping up one layer and then wrapping up, by constraining, on a side toward the annular core, an end portion of a round steel wire in the one layer or a vicinity of that end portion, a following one layer.

According to configuration (15), a higher-strength cable bead can be manufactured.

A cable bead manufacturing device according to any of (13) to (15), wherein the annular core formation mechanism has an annular core turning mechanism of turning the annular core in a circumferential direction,wherein the side wire wrapping mechanism has a first cassette movement mechanism of moving a cassette accommodating a round steel wire between outside and inside a ring of the annular core, and a second cassette movement mechanism of moving the cassette inside a ring of the annular core from one side of a turning axis of the annular core to another side thereof and moving the cassette outside a ring of the annular core from another side of a turning axis of the annular core to one side thereof, and is a mechanism of moving the cassette between inside and outside a ring of the annular core turning in a circumferential direction, and spirally wrapping up, around the annular core, a round steel wire drawn out of the cassette,wherein the annular core turning mechanism has a driving source and a pinch roller portion,wherein the pinch roller portion has a driving roller provided to either one side of, inside or outside a ring of the annular core and rotated by driving force out of the driving source, a driven roller rotatably provided to either another side of, inside or outside a ring of the annular core, a pinch roller turning the annular core forward/reversely, and a rotary encoder attached to the pinch roller or the driven roller in order to measure in length a round steel wire to be made to circle as the annular core,and a marking mechanism of marking, when a measurement value by the rotary encoder reaches a predetermined value, a surface of a round steel wire being at a site where such a value is reached.

According to configuration (16), by making an annular core turning mechanism have a driving roller provided to either one side of, inside or outside a ring of an annular core and rotated by driving force out of a driving source, and a driven roller rotatably provided to either another side of, inside or outside a ring of the annular core, so that the device has a minimum configuration while securing shape stability on an occasion of manufacturing an annular core and a cable bead, equipment costs are also allowed to be reduced and therefore, a high economic efficiency effect is achieved. Additionally, by allowing a pinch roller to rotate forward/reversely, a side wire wrapping direction of a cable bead is allowed to be determined freely. Furthermore, by attaching a rotary encoder to one pinch roller that can turn an annular core or a cable bead forward/reversely or to one driven roller, a mechanism that a wire to be wrapped up as the annular core is allowed to be measured in length is provided. This allows an inner diameter to be easily set for a cable bead on the basis of one-time wrapping length for a wire, and significantly contributes to shape stability, productivity enhancement, and yield enhancement for the cable bead. In addition, as necessary, through a marking mechanism linked to a rotary encoder, a loop obtained by drawing a round steel wire at one end out of a cassette and making it circle once or a loop obtained by making a round steel wire circle 2 to 10 times side by side can be formed while in a process of partially constraining a loop of the round steel wire drawn out, a constraint position can be confirmed and such constraint be made, efficiently with precision. Therefore, further, a cable bead is enhanced in shape stability, productivity enhancement and yield enhancement.

Additionally, by applying a taper roll as a roll or the like used for the present device and varying that slant as appropriate, a loop obtained by drawing a round steel wire at one end out of a cassette and making the round steel wire circle 2 to 10 times side by side is formed. On this occasion, a difference in loop wrapping length is allowed to be provided between a loop corresponding to a tire width direction-inner side of a cable bead and a loop corresponding to a tire width direction-outer side thereof. Accordingly, on an occasion of wrapping up a round steel wire as a side wire consecutively on such a loop to manufacture a cable bead, and further, even on an occasion of laminating the side wire, the cable bead is stabilized in shape. Since a difference can be, as a result, provided between a tire width direction-outer cable bead ring radius Do (mm) and a tire width direction-inner cable bead ring radius Di (mm), a cable bead whose relation to a cable bead sectional maximum width Wm (mm) meets 0≤(Do−Di)/Wm≤√3/2 can be manufactured while stabilized in shape, high in yield rate, and excellent in productivity.

A cable bead manufacturing device according to any of (13) to (15), comprising an annular core turning mechanism of turning an annular core in a circumferential direction, a round steel wire supply unit to supply a round steel wire wrapped up around a reel to a wrapping portion of the annular core, a slide unit to move the reel of the round steel wire supply unit in parallel to a turning plane of the annular core from outside the annular core toward inside it, move it perpendicularly through inside a ring of the annular core from one side of the annular core to another side thereof, move it in parallel to a turning plane of the annular core from inside the annular core to outside it, and move it perpendicularly from the other side of the annular core to a starting position on the one side thereof to return it thereto,wherein the annular core turning mechanism comprises a pinch roller provided in a vicinity of a top portion of the annular core and turning the annular core forward/reversely, a loose roller provided in a vicinity of a bottom portion of the annular core and guiding the annular core, a rotary encoder attached to the pinch roller or a driven roller in order to measure in length a round steel wire to be made to circle as the annular core, and a marking mechanism of marking, when a measurement value according to the rotary encoder reaches a predetermined value, a surface of a round steel wire being at a position where such a value is reached,and wherein the round steel wire supply unit has two reel receipt and delivery mechanisms facing each other while interposing a turning plane of the annular core therebetween, is configured to rotatably accommodate the reel in a cassette being a little larger in diameter than the reel in outer diameter and simultaneously having a cylindrical outer circumferential wall substantially equal in inner width to the reel and to draw out a round steel wire through a drawing hole provided to an outer circumferential wall of the cassette, and is provided to two locations lying symmetrically with respect to a turning axis of the annular core.

According to configuration (17), by configuring an annular core turning mechanism to be provided with one pinch roller in a vicinity of a top portion of an annular core, and a loose roller to guide the annular core in a vicinity of a bottom portion of the annular core, so that it has a minimum device configuration while securing shape stability on manufacturing an annular core and a cable bead, equipment costs are also allowed to be reduced and therefore, a high economic efficiency effect is achieved. Additionally, by allowing a pinch roller to rotate forward/reversely, a side wire wrapping direction of a cable bead is allowed to be determined freely. Furthermore, by attaching a rotary encoder to one pinch roller that can turn an annular core forward/reversely or to one driven roller, a mechanism that a wire to be wrapped up as the annular core is allowed to be measured in length is provided. This allows an inner diameter to be easily set for a cable bead on the basis of one-time wrapping length for a wire, and significantly contributes to shape stability, productivity enhancement, and yield enhancement for the cable bead. As necessary, through a marking mechanism linked to a rotary encoder, a loop obtained by drawing a round steel wire at one end out of a cassette and making it circle once or making the round steel wire circle 2 to 10 times side by side can be formed while in a process of partially constraining a loop of the round steel wire drawn out, such a constraint be made efficiently with precision, and therefore, further, a cable bead is enhanced in shape stability, productivity enhancement and yield enhancement.

Additionally, by applying a taper roll as a roll or the like used for the present device and varying that slant as appropriate, a loop obtained by drawing a round steel wire at one end out of a cassette and making the round steel wire circle 2 to 10 times side by side is formed. On this occasion, a difference in loop wrapping length is allowed to be provided between a loop corresponding to a tire width direction-inner side of a cable bead and a loop corresponding to a tire width direction-outer side thereof. Accordingly, on an occasion of wrapping up a round steel wire as a side wire consecutively on such a loop to manufacture a cable bead, and further, even on an occasion of laminating the side wire, the cable bead is stabilized in shape. Since a difference can be, as a result, provided between a tire width direction-outer cable bead ring radius Do (mm) and a tire width direction-inner cable bead ring radius Di (mm), a cable bead whose relation to a cable bead sectional maximum width Wm (mm) meets 0≤(Do−Di)/Wm≤√3/2 can be manufactured while stabilized in shape, high in yield rate, and excellent in productivity.

Furthermore, by having provided a round steel wire supply unit to two locations lying symmetrically with respect to a turning axis of the annular core, it follows that a round steel wire to be followingly laminated is wrapped up in an opposite direction on an occasion of manufacturing a multilayer cable bead.

However, it is made possible to spirally wrap up a round steel wire while supplying the round steel wire from a cassette opposite to that where a cable bead to be an annular core has been manufactured and turning it in a direction opposite to a circumferential direction in which a cable bead corresponding to the annular core has been manufactured. Accordingly, a cassette filled with a wire to be followingly laminated can be set in the midst of laminating a round steal wire, a stop period occurring every time a layer is laminated can be minimized, and productivity for a multilayer cable bead can be raised.

(18) A cable bead manufacturing device according to (16) or (17),wherein the annular core formation mechanism has a drum made up of a former allowed to be divided into two to six in a circumferential direction while allowed to have its diameter increased and decreased, a turning mechanism of turning the drum in a circumferential direction, and a movement mechanism of allowing the annular core to move between a position at which it is delivered to a process of wrapping up a round steel wire thereon and a position at which it does not interfere in a process of wrapping up a round steel wire.

According to configuration (18), by being provided with a drum made up of a former allowed to be divided into two to six while allowed to have its diameter increased and decreased, an annular core is allowed to be shaped for its diameter with excellent precision. Additionally, a work of forming an annular core and then spirally wrapping up a round steel wire as a side wire is allowed to be carried out with one device. Additionally, by applying a taper roll as a roll or the like used for the present device, granting a taper even to a former allowed to be divided into two to six in a circumferential direction while allowed to have its diameter increased and decreased, and varying that slant as appropriate, a loop obtained by drawing a round steel wire at one end out of a cassette and making the round steel wire circle 2 to 10 times side by side is formed. On this occasion, a difference in loop wrapping length is allowed to be provided between a loop corresponding to a tire width direction-inner side of a cable bead and a loop corresponding to a tire width direction-outer side thereof. Accordingly, on an occasion of wrapping up a round steel wire as a side wire consecutively on such a loop to manufacture a cable bead, and further, even on an occasion of laminating the side wire, the cable bead is stabilized in shape. Since a difference can be, as a result, provided between a tire width direction-outer cable bead ring radius Do (mm) and a tire width direction-inner cable bead ring radius Di (mm), a cable bead whose relation to a cable bead sectional maximum width Wm (mm) meets 0≤(Do−Di)/Wm≤√3/2 can be manufactured while stabilized in shape, high in yield rate, and excellent in productivity.

(19) A cable bead manufacturing device according to (16) or (17),wherein the annular core formation mechanism has a drum made up of a former allowed to be divided into two to six in a circumferential direction while allowed to have its diameter increased and decreased, and a movement mechanism of allowing the annular core to move between a position at which it is delivered to a process of wrapping up a round steel wire thereon and a position at which it does not interfere in a process of wrapping up a round steel wire,and wherein after the annular core is formed by wrapping up a round steel wire side by side around the drum in a state where the drum has its diameter increased to be in such a shape as allowing itself to hold the annular core, the drum is made to have its diameter decreased as well as the drum is moved, along a turning axis of the annular core, to a position where it does not interfere in a process of wrapping up a round steel wire.

According to configuration (19), by being provided with a drum made up of one former or a former allowed to be divided into two to six while allowed to have its diameter increased and decreased, an annular core is allowed to be shaped for its diameter with excellent precision. Additionally, a work of forming an annular core and then spirally wrapping up a round steel wire as a side wire is allowed to be carried out with one device. In addition, since the annular core is, thereafter, formed at a position identical to that of a mechanism of wrapping up a round steel wire as a side wire around the annular core, the annular core can be minimally repressed from being moved and from being positionally adjusted, which can, in addition to raising productivity, stabilize a cable bead in shape and further, enhance good products in yield.

Additionally, by applying a taper roll as a roll or the like used for the present device, granting a taper even to a former allowed to be divided into two to six in a circumferential direction while allowed to have its diameter increased and decreased, and varying that slant as appropriate, a loop obtained by drawing a round steel wire at one end out of a cassette and making the round steel wire circle 2 to 10 times side by side is formed. On this occasion, a difference in loop wrapping length is allowed to be provided between a loop corresponding to a tire width direction-inner side of a cable bead and a loop corresponding to a tire width direction-outer side thereof, and on an occasion of wrapping up a round steel wire as a side wire consecutively on such a loop to manufacture a cable bead, and further, even on an occasion of laminating the side wire, the cable bead is stabilized in shape. Since a difference can be, as a result, provided between a tire width direction-outer cable bead ring radius Do (mm) and a tire width direction-inner cable bead ring radius Di (mm), a cable bead whose relation to a cable bead sectional maximum width Wm (mm) meets 0≤(Do−Di)/Wm≤√3/2 can be manufactured while stabilized in shape, high in yield rate, and excellent in productivity.

EMBODIMENTS

As follows, embodiment examples of a cable bead, a cable bead manufacturing method, a cable bead manufacturing device, and a tire, according to the present invention are described in reference to the drawings.

[Tire Structure]

A tire1exemplified inFIG.1is provided with a wheel rim10and a tire main body2attached to an outer circumference side thereof. The tire main body2is a rubber-made member. The tire main body2has a bead portion4on its both sides, which a cable bead3passes, a side wall portion5extending from each of the bead portions4outward in a tire radius direction, and a tread portion6which connect upper ends thereof. Between both of the bead portions4, a carcass7is bridged, and on a side outward the carcass7and inward from the tread portion6, a belt layer8is circumferentially wrapped.

InFIG.1, each of the tire width direction-inner cable bead ring radius Di (mm), the tire width direction-outer cable bead ring radius Do (mm), and the cable bead sectional maximum width Wm (mm) is shown. The cable bead3is placed in the bead portion4so as to meet 0≤(Do−Di)/Wm≤√3/2, and is placed in such a manner as going along a rim portion of a wheel rim10.

[Cable Bead Structure]

Followingly, an embodiment example of a cable bead according to the present invention is explained in reference toFIG.2toFIG.6.

A cable bead3(11) exemplified inFIG.2andFIG.3has an annular core13and a side wire14spirally wrapped up around the annular core13. The annular core13is made up of a round steel wire12made to circle twice side by side without being stranded. The side wire14is a round steel wire12consecutive from the annular core13. In order to fix a ring form of the annular core13in a case of a cable bead3, for example, a final circling end portion (ring endpoint) of a round steel wire12making up the annular core13or an optional position of the annular core13is constrained with an adhesive agent, and thereafter, that round steel wire12is spirally wrapped up consecutively without being cut. After that, an end terminal of a round steel wire12of a side wire14is cut and an end portion of the round steel wire12of a side wire14or a vicinity thereof is constrained to an annular core13with an adhesive agent, and thereby, a cable bead3is configured. For a round steel wire12, for example, a steel wire which contains carbon at 0.72 to 1.10 mass %, has characteristics of 0.9 to 3.0 mm in diameter, 1800 to 3200 MPa in tensile strength, and 2 to 5% in stretch, and has brass plating, bronze plating, or zinc phosphate coating, applied as its surface treatment is used.

When an annular core13is made to circle twice side by side without being stranded, it can also be made a cable bead3(11) wherein a relation between a tire width direction-outer cable bead ring radius Do (mm), a tire width direction-inner cable bead ring radius Di (mm), and a cable bead sectional maximum width Wm (mm) meets 0≤(Do−Di)/Wm≤√3/2, by providing a gradual difference in loop wrapping length between a loop corresponding to a tire width direction-inner side of a cable bead and a loop corresponding to a tire width direction-outer side thereof.

A cable bead3(16) exemplified inFIG.4andFIG.5has an annular core13made up of a round steel wire12made to circle twice side by side without being stranded, and side wires14,15laminated in two layers around the annular core13. The side wires14,15, which lie in layers adjacent to each other, are wrapped up in directions opposite to each other. This cable bead3(16) has a structure in which around a cable bead11ofFIG.2, a side wire15is spirally wrapped up in a direction opposite to that in which a side wire14is wrapped up. The side wire15is made of a round steel wire12not consecutive with the annular core13. After an end terminal of a round steel wire12of a side wire15is cut, both ends of the side wire15is constrained with a brass sleeve tube or is constrained to a side wire14with an adhesive agent. A round steel wire12of a side wire15does not need to be identical to a round steel wire12of a side wire14, and for example, a steel wire which contains carbon at 0.72 to 1.10 mass %, has characteristics of 0.9 to 3.0 mm in diameter, 1800 to 3200 MPa in tensile strength, and 2 to 5% in stretch, and has brass plating, bronze plating, or zinc phosphate coating, applied as its surface treatment is used.

Additionally, by having a structure in which a side wire15is spirally wrapped up, in a direction opposite to that in which a side wire14is wrapped up, once around a cable bead11wherein a relation between a tire width direction-outer cable bead ring radius Do (mm), a tire width direction-inner cable bead ring radius Di (mm), and a cable bead sectional maximum width Wm (mm) meets 0≤(Do−Di)/Wm≤√3/2, a cable bead3(16) also makes a shape meeting conditions within the present invention like the cable bead11, which is an annular core.

A cable bead3(17) exemplified inFIG.6has an annular core13(18) made up of a round steel wire12made to circle 3 times side by side without being stranded, and side wires19,20laminated in two layers around the annular core13. The side wires19,20, which lie in layers adjacent to each other, are wrapped up in directions opposite to each other. The side wire20is made of a round steel wire12not consecutive with the annular core13(18). After an end terminal of a round steel wire12of a side wire20is cut, both ends of the side wire20is constrained with a brass sleeve tube or is constrained to a side wire19with an adhesive agent.

A round steel wire12of a side wire20does not need to be identical to a round steel wire12of a side wire19, and for example, a steel wire which contains carbon at 0.72 to 1.10 mass %, has characteristics of 0.9 to 3.0 mm in diameter, 1800 to 3200 MPa in tensile strength, and 2 to 5% in stretch, and has brass plating, bronze plating, or zinc phosphate coating, applied as its surface treatment is used.

Additionally, a cable bead3(17) which has a structure in which a side wire20is spirally wrapped up in a direction opposite to each other with a side wire19in an adjacent layer, in a cable bead obtained by wrapping up a side wire19around an annular core (18) wherein a relation between a tire width direction-outer cable bead ring radius Do (mm), a tire width direction-inner cable bead ring radius Di (mm), and a cable bead sectional maximum width Wm (mm) meets 0≤(Do−Di)/Wm≤√3/2, also makes a shape meeting conditions within the present invention like the cable bead obtained by wrapping up a side wire19around an annular core (18).

Although in a case of a cable bead whose transverse section described above is in a substantially elliptical shape, a round steel wire may be arranged side by side in a range of 2 to 10 rows as an annular core, it is optimally arranged in about 5 rows. In a multilayer cable bead obtained by spirally wrapping up a round steel wire to make a side wire through using as an annular core, a cable bead formed by using as an annular core, a round steel wire arranged side by side in a range of 2 to 10 rows, a round steel-wire side wire can be laminated in any number of layers, but optimally in about twenty layers.

The above statement describes one example of a cable bead according to the present invention, and by a cable bead according to the present embodiment, the cable bead has its transverse section shaped in a substantial circle when an annular core is made up of a round steel wire having circled once without being stranded. While such a cable bead being made an annular core, a round steel-wire side wire can be laminated in any number of layers in a multilayer cable bead obtained by spirally wrapping up a round steel wire to make a side wire, but optimally in about twenty layers.

Additionally, by selecting times in number of wrapping up a side wire consecutive to arrays of a round steel wire to be an annular core on the annular core out of numbers between one and times in number (e.g., 9 times in a cable bead shown inFIG.3) at which to cover the annular core completely, a cable bead whose shape and characteristics are adjusted in accordance with characteristics requested is obtained. While such a cable bead being made an annular core, a round steel-wire side wire can be laminated in any number of layers while times in number that it is wrapped up are selected, in a multilayer cable bead obtained by spirally wrapping up a round steel wire to make a side wire, but optimally in about twenty layers.

[Part 1, Cable Bead Manufacturing Device Structure]

A first embodiment of a cable bead manufacturing device (hereinafter, simply referred to as “manufacturing device”) according to the present invention is explained on the basis ofFIG.7andFIG.8. This explanation is also an explanation of a first embodiment of a cable bead manufacturing method according to the present invention.

(Overall Structure)

As shown inFIG.7andFIG.8, a manufacturing device100comprises an annular core formation mechanism101for forming an annular core13by making a round steel wire12, without stranding it, circle 2 to 10 times side by side, and a side wire wrapping mechanism102of spirally wrapping up a round steel wire12consecutive from the annular core13around the annular core13without cutting it. The side wire wrapping mechanism102is a mechanism that can wrap up a round steel wire in layers adjacent to each other around the annular core13in directions opposite to each other in a plurality of layers. The side wire wrapping mechanism102is a mechanism that can wrap up one layer and then wrap up, by constraining, on a side toward the annular core13, an end portion of a round steel wire12in the one layer, a following one layer.

An annular core formation mechanism101has an annular core turning mechanism28of turning an annular core13in a circumferential direction. A side wire wrapping mechanism102has a first cassette movement mechanism22of moving a cassette24accommodating a round steel wire12between outside and inside a ring of the annular core13, and a second cassette movement mechanism23of moving the cassette24inside a ring of the annular core13from one side of a turning axis of the annular core13to another side thereof and moving the cassette24outside a ring of the annular core13from another side of a turning axis of the annular core13to one side thereof. The side wire wrapping mechanism102moves the cassette24between inside and outside a ring of the annular core13turning in a circumferential direction, and spirally wraps up, around the annular core13, a round steel wire12drawn out of the cassette24.

(Annular Core Formation Mechanism)

An annular core turning mechanism28is provided with a housing29, a clamp portion30, two pairs of pinch roller portions32,33, a presser roller34, and a marking mechanism39. The annular core turning mechanism28circumferentially turns an annular core13counterclockwise in an example ofFIG.7. As shown inFIG.8, a shaft to drive a pinch roller32or33is provided with a rotary encoder37, and on the basis of a rotation amount of the pinch roller32or33, the round steel wire12drawn from a cassette24is measured in length. A measurement value is displayed on a display instrument38provided to a housing29.

A marking device39is, as shown inFIG.7andFIG.8, made up of a paint blowing nozzle40and a paint blowing device41, for example. The marking mechanism39is that of marking, when a measurement value of the round steel wire12drawn out of a cassette24in length reaches a predetermined value, a surface of a round steel wire12being at a site where such a value is reached, by blowing paint thereon.

A clamp portion30is attached to a housing29. The clamp portion30gets in contact with an annular core13at a highest position of the annular core13. The clamp portion30is provided with two rollers31a,31bwhose turning axis are directed horizontally or vertically, and which are placed in opposition to each other. Between these rollers31aand31b, an annular core13and a side wire14consecutive with the annular core13is passed through insertion.

Pinch roller portions32,33are rotatably attached to a housing29in positions separated from each other. The pinch roller portions32,33are, respectively, provided with inner rollers32a,33aand with outer rollers32b,33b. The inner rollers32a,33aare driven by a roller driving motor25installed inside the housing29. The inner rollers32a,33aget in contact with a round steel wire12spirally wrapped up around an annular core13or cable bead to turn the round steel wire12spirally wrapped up around an annular core13or cable bead. The outer rollers32b,33bget in contact with a round steel wire12spirally wrapped up around an annular core13or cable bead to be rotated as the annular core13or the round steel wire12spirally wrapped up around an annular core13or cable bead turns.

A housing29has an arm35rotatably attached. The arm35has, at its one end, a presser roller34rotatably attached. The arm35is, at its other end, supported by the housing29through a spring36. This presser roller34gets, below a pinch roller portion33lying on a lower side, in contact with an annular core13or cable bead. The presser roller34represses the annular core13or cable bead from shaking as it comes to do while turning.

(First Cassette Movement Mechanism)

As shown inFIG.7andFIG.8, a first cassette movement mechanism22is made up of a movement table45that is made by a crank mechanism linked to a driving motor42to move back and forth along a rail44placed in parallel with a radial direction (left-right direction inFIG.7andFIG.8) in a horizontal direction of an annular core13and to move, as seen in front, a cassette24between outside and inside a ring of an annular core13or cable bead, and a pair of cassette stands46that are provided on the movement table45and face each other with a turning plane74(FIG.8) of the annular core13interposed.

(Second Cassette Movement Mechanism)

As shown inFIG.7, a second cassette movement mechanism47is provided to an upper portion of a cassette stand46. As shown inFIG.8, the cassette stands46are provided to one side of a turning axis of an annular core13or cable bead with respect to a turning plane74of the annular core13or cable bead and another side thereof. Each of this pair of cassette stands46is provided with a second cassette movement mechanism47. The second cassette movement mechanism47moves a cassette24with respect to a turning plane74of the annular core13or cable bead from one side to another side and then from the other side to the one side in a turning-axis direction of the annular core13or cable bead. The second cassette movement mechanism47is provided with pins48protruding while facing each other. By those pins48, the cassette24is supported so that it cannot turn relatively to the second cassette movement mechanism47.

(Cassette)

As shown inFIG.7, a cassette24has a reel49on an outer circumference of which a round steel wire12is wrapped up, and a case50to accommodate the reel49and cover an outer circumference side of the round steel wire12. The case50has, on its outer circumference wall, an unwinding hole51formed, and from the unwinding hole51, a round steel wire12is drawn toward a wrapping point of an annular core13or cable bead.

(Actions of Manufacturing Devices)

A manufacturing device100configured as described above firstly forms an annular core13with an annular core formation mechanism101. On that occasion, the annular core formation mechanism101draws, by using an annular core turning mechanism28, a round steel wire12out of a cassette24in a length adapted to a cable bead inner diameter specification, makes it pass between rollers31aand31b, thereafter, makes it go via pinch roller portions32,33and a presser roller34in sequence, and again, makes it pass between rollers31aand31b. On that occasion, a worker checks on a length of the round steel wire12drawn out with a display instrument38, and fixes an end portion of the round steel wire12and a location corresponding to a length adapted to the cable bead inner diameter specification, every circle with a Sellotape (registered trademark), an adhesive agent, or the like. A surface corresponding to the length adapted to the cable bead inner diameter specification of the round steel wire12is marked (has a mark printed), with a marking mechanism39, if necessary.

After an annular core13is, by the procedure above, formed by making a round steel wire12, without stranding it, circle 2 to 10 times side by side, the annular core13is made to turn in a circumferential direction by an annular core turning mechanism28without cutting a round steel wire12consecutive from the annular core13. Then, a cable bead3substantially elliptical in section is manufactured by moving a cassette24between inside and outside a ring of an annular core13turning in a circumferential direction, and spirally wrapping up, around the annular core13, a round steel wire12drawn out of the cassette24, as a side wire.

The above statement describes one example of a cable bead according to the present invention, and by a cable bead according to the present embodiment, the cable bead has its transverse section shaped in a substantial circle when an annular core is made up of a round steel wire having circled once. While such a cable bead being made an annular core, a multilayer cable bead obtained by spirally wrapping up a round steel wire on this annular core to make a side wire can be manufactured.

Additionally, by selecting times in number of wrapping up a side wire consecutive to arrays of a round steel wire to be an annular core on the annular core out of numbers between one and times in number (e.g., 8 times in a cable bead shown inFIG.3) at which to cover the annular core completely, a cable bead whose shape and characteristics are adjusted in accordance with characteristics requested is obtained. While such a cable bead being made an annular core, a multilayer cable bead obtained by spirally wrapping up a round steel wire to make a side wire can be manufactured.

Additionally, by applying a taper roll as a roll or the like used for the present device and varying that slant as appropriate, a loop obtained by drawing a round steel wire at one end out of a cassette and making the round steel wire circle 2 to 10 times side by side is formed. On this occasion, a difference in loop wrapping length is allowed to be provided between a loop corresponding to a tire width direction-inner side of a cable bead and a loop corresponding to a tire width direction-outer side thereof. Then, on an occasion of wrapping up a round steel wire as a side wire consecutively on such a loop to manufacture a cable bead, and further, even on an occasion of laminating the side wire, the cable bead is stabilized in shape. Since a difference can be, as a result, provided between a tire width direction-outer cable bead ring radius Do (mm) and a tire width direction-inner cable bead ring radius Di (mm), a cable bead whose relation to a cable bead sectional maximum width Wm (mm) meets 0≤(Do−Di)/Wm≤√3/2 can be manufactured while stabilized in shape, high in yield rate, and excellent in productivity.

FIGS.9(a)˜(d) are pattern diagrams showing a manufacturing process (side wire wrapping process) with a manufacturing device according to the present embodiment. Although originally an annular core13has its round steel wire12form a loop where a round steel wire circling 2 to 10 times lies side by side, it is shown while having its structure left out for convenience.

Firstly, in a state ofFIG.9(a), a cassette24lies on one side of a turning plane74of an annular core13or cable bead, outside a ring of the annular core13. On this occasion, the round steel wire12is made to go along an outer circumference of the annular core13with rollers31a,31bof a clamp portion30, as a side wire. By the pinch rollers32a,32b,33a,33brotated, a round steel wire12to be a side wire14is, as the annular core13or the cable bead turns, drawn out of the cassette24and drawn in toward the annular core13.

To start from a state ofFIG.9(a), while an annular core13is turned in a circumferential direction with pinch rollers32a,32b,33a,33b, a cassette24is moved to an inner side of a ring of the annular core13with a first cassette movement mechanism22. This makes the state turn into that ofFIG.9(b).

Further, to start from a state ofFIG.9(b), while an annular core13is turned in a circumferential direction, a cassette24is moved to another side of a turning plane74of the annular core13with a second cassette movement mechanism47. This makes the state turn into that ofFIG.9(c). Then, at rollers31a,31bof a clamp portion30, a round steel wire12is spirally wrapped up on the annular core13by half a circle thereof only, as a side wire14.

Then, to start from a state ofFIG.9(c), while an annular core13is turned in a circumferential direction, a cassette24is moved to an outer side of a ring of the annular core13with a first cassette movement mechanism22. This makes the state turn into that ofFIG.9(d).

Further, to start from a state ofFIG.9(d), while an annular core13is turned in a circumferential direction, a cassette24is moved to one side of a turning plane74of the annular core13with a second cassette movement mechanism47. This makes the state turn into that ofFIG.9(a). Then, at rollers31a,31bof a clamp portion30, a round steel wire12is spirally wrapped up on the annular core13by half a circle thereof further, as a side wire. Thereby, it follows that a round steel wire12has circled once on the annular core13as a side wire14.

On repeating a process step ofFIGS.9(a)˜(d) and moving a cassette24while turning an annular core13or a cable bead, a round steel wire12is spirally wrapped up on an outer circumference of the annular core13as a side wire14. In some cases, by reversely repeating a process step ofFIGS.9(a)˜(d), a round steel wire12is allowed to be wrapped up on the annular core13as a side wire in a stranding direction reverse to a stranding direction that can be obtained by forward repeating the process step ofFIGS.9(a)˜(d).

For example, a cable bead11formed by making an annular core13and a round steel wire12be a side wire14as shown inFIG.2is manufactured by repeating a process ofFIGS.9(a)˜(d) in a forward direction to wrap up a first layer of a round steel wire12on an annular core13by S twist as a side wire14, cut the round steel wire12temporarily, and fix it at its end portion with an adhesive agent or the like. Additionally, it is also allowable to manufacture a cable bead16shown inFIG.4by making the cable bead11be an annular core13, and repeating, in a direction opposite to that for the cable bead11, a process of wrapping up a round steel wire12, to wrap it up as a side wire15being a second layer. In addition, in a case where a round steel wire12is laminated in a plurality of layers on a cable bead as a side wire, it is also allowable to manufacture a cable bead having a side wire in a plurality of layers, by alternately repeating S twists and Z twists in a direction opposite to that in which a side wire of a cable bead to be an annular core13is wrapped.

Since both an annular core formation process and a side wire wrapping process of spirally wrapping up a round steel wire12are, as described above, carried out with one device, an effect of enhancing productivity in manufacturing a cable bead is extremely great, and additionally, since a large-scale device to form an annular core13is not required, a significant economic efficiency effect is achieved.

[Part 2, Manufacturing Device Structure]

Another embodiment of a manufacturing device according to the present invention is explained on the basis ofFIGS.10(a)˜(c) andFIG.11. This explanation is also an explanation of another embodiment of a manufacturing method according to the present invention. In the following explanation, a component element identical or common to component elements explained already shall have its explanation left out as appropriate by being given an identical numerical sign.

(Overall Structure)

A manufacturing device200exemplified inFIGS.10(a)˜(c) comprises an annular core formation mechanism201for forming an annular core13by making a round steel wire12, without stranding it, circle 2 to 10 times side by side, and a side wire wrapping mechanism202of spirally wrapping up a round steel wire12consecutive from the annular core13around the annular core13without cutting it. The annular core formation mechanism201is, for example, provided with an annular core turning mechanism52of turning a round steel wire12arranged side by side in3˜4to be the annular core13in a circumferential direction, and a pressor roller53to guide the annular core13. The side wire wrapping mechanism202has two round steel wire supply units203at positions bilaterally symmetrical to each other with a turning axis58of the annular core13centered. Each of the round steel wire supply units203has a first cassette movement mechanism54, a second cassette movement mechanism55, and a cassette56accommodating a round steel wire12.

(Annular Core Turning Mechanism)

An annular core turning mechanism52can turn an annular core13clockwise and counterclockwise in a circumferential direction with a turning axis58centered.

Pinch roller portions60a,60b,61of an annular core turning mechanism52are provided at a such position that in order to wrap up a round steel wire12supplied by a cassette56on an annular core13, the cassette56can be moved between outside and inside a ring of the annular core13. The pinch roller portions60a,60bare, in order to set the annular core13, provided at such a position that they are directly coupled to driving shafts63a,63bextended from a driving motor62provided to a housing59and in contact with the annular core13in a vicinity of a highest position of the annular core13. Additionally, the pinch roller portions60a,60b,61are, in order to have their turning axes directed in a horizontal direction and to make a three-point contact, provided with rollers60a,60bon an upper part and a roller61on a lower part. By the annular core13and a round steel wire12as a side wire being passed through insertion between the rollers60a,60band the roller61, a round steel wire12drawn out of the cassette56merges into the annular core13as a side wire.

As shown inFIG.11, a shaft to drive a shaft63aor63bto drive pinch rollers60a,60bis provided with a rotary encoder64, and are configured so that on the basis of a rotation amount of the pinch rollers, a round steel wire12drawn out of a cassette56is measured in length and a value thereof is displayed on a display instrument65.

Additionally, an annular core turning mechanism52comprises a marking mechanism66. The marking mechanism66is, as shown inFIGS.10(a)˜(c) andFIG.11, made up of a paint blowing nozzle67and a paint blowing device68, for example. The marking mechanism66is that of marking, when a measurement value of the round steel wire12drawn out of a cassette56in length reaches a predetermined value, a surface of a round steel wire12being at a site where such a value is reached, by blowing paint thereon

For a housing59, a housing69to rotatably support an arm70is installed and one end of the arm70is linked through a spring70ato the housing59. Another end of the arm70is provided with a presser roller53. The presser roller53is rotatably provided at such a position that in order to wrap up a round steel wire12supplied by a cassette56on the annular core13as a side wire, the cassette56can be moved between outside and inside a ring of the annular core13. This presser roller53is in contact with the annular core13in a vicinity of a lowest position of the annular core13so as to press it downward. The presser roller53represses the annular core13or cable bead from shaking as it comes to do while turning.

(First Cassette Movement Mechanism)

As shown inFIGS.10(a)˜(c), for a first cassette movement mechanism54, each one set thereof is installed bilaterally symmetrically with respect to a turning axis58. The first cassette movement mechanism54is provided with a linkage mechanism71, a motor72connected with one side of the linkage mechanism71, and a cassette stand73fixed to another side of the linkage mechanism71. By the motor72rotating, the other side of a linkage mechanism71is moved in a right-left direction to move a cassette56between outside and inside a ring of an annular core13.

(Second Cassette Movement Mechanism)

As shown inFIGS.10(a)˜(c), a second cassette movement mechanism55is provided to each of upper portions of cassette stands73of both of first cassette movement mechanisms54placed symmetrically with respect to a turning axis58of an annular core13.

As shown inFIG.11, a cassette stand73is provided on one side and another side with a turning plane74of an annular core13interposed. Each of this one pair of cassette stands73is provided with a second cassette movement mechanism55.

The second cassette movement mechanism55moves a cassette56, in parallel with respect to a turning plane74of the annular core13from one side to another side and then from the other side to the one side in a turning-axis58direction of the annular core13. The second cassette movement mechanism55is provided with a pin75protruding mutually, and supports the cassette56with the pins75.

(Cassette)

As shown inFIGS.10(a)˜(c), a cassette56has a reel76on an outer circumference of which a round steel wire12is wrapped up, a case77to accommodate the reel76and cover an outer circumference side of the round steel wire12, and a through hole78provided on an outer circumference of the case77. A round steel wire12wrapped up around the reel76is supplied from this through hole78and drawn out toward an annular core13.

(Actions of Manufacturing Devices)

A manufacturing device200configured as described above firstly forms an annular core13with an annular core formation mechanism201. On that occasion, the annular core formation mechanism201draws, by using an annular core turning mechanism52, a round steel wire12out of a cassette56in a length adapted to a cable bead inner diameter specification, makes it go via pinch roller portions60a,60b,61, further makes it pass a presser roller53, and again, makes it pass pinch rollers portions60a,60b,61. On that occasion, a worker checks on a length of the round steel wire12drawn out with a display instrument65, and fixes an end portion of the round steel wire12and a location corresponding to a length adapted to the cable bead inner diameter specification, every circle with a Sellotape (registered trademark), an adhesive agent, or the like. A surface corresponding to the length adapted to the cable bead inner diameter specification of the round steel wire12is marked, with a marking mechanism66, if necessary.

After an annular core13is, by the procedure above, formed by making a round steel wire12, without stranding it, circle 2 to 10 times side by side, the annular core13is made to turn in a circumferential direction by an annular core turning mechanism52without cutting a round steel wire12consecutive from the annular core13. Then, a cable bead3substantially elliptical in section is manufactured by moving a cassette56between inside and outside a ring of an annular core13turning in a circumferential direction, and spirally wrapping up, around the annular core13, a round steel wire12drawn out of the cassette56, as a side wire.

The above statement describes one example of a cable bead according to the present invention, and by a cable bead according to the present embodiment, the cable bead has its transverse section shaped in a substantial circle when an annular core is made up of a round steel wire having circled once. While such a cable bead being made an annular core, a multilayer cable bead obtained by spirally wrapping up a round steel wire on this annular core to make a side wire can be manufactured.

Additionally, by selecting times in number of wrapping up a side wire consecutive to arrays of a round steel wire to be an annular core on the annular core out of numbers between one and times in number (e.g., 8 times in a cable bead shown inFIG.3) at which to cover the annular core completely, a cable bead whose shape and characteristics are adjusted in accordance with characteristics requested is obtained. While such a cable bead being made an annular core, a multilayer cable bead obtained by spirally wrapping up a round steel wire to make a side wire can be manufactured.

Additionally, by applying a taper roll as a roll or the like used for the present device and varying that slant as appropriate, a loop obtained by drawing a round steel wire at one end out of a cassette and making the round steel wire circle 2 to 10 times side by side is formed. On this occasion, a difference in loop wrapping length is allowed to be provided between a loop corresponding to a tire width direction-inner side of a cable bead and a loop corresponding to a tire width direction-outer side thereof. Then, on an occasion of wrapping up a round steel wire as a side wire consecutively on such a loop to manufacture a cable bead, and further, even on an occasion of laminating the side wire, the cable bead is stabilized in shape. Since a difference can be, as a result, provided between a tire width direction-outer cable bead ring radius Do (mm) and a tire width direction-inner cable bead ring radius Di (mm), a cable bead whose relation to a cable bead sectional maximum width Wm (mm) meets 0≤(Do−Di)/Wm≤√3/2 can be manufactured while stabilized in shape, high in yield rate, and excellent in productivity.

FIGS.12(a)˜(h) are pattern diagrams showing a manufacturing process with a manufacturing device according to the present embodiment. Although originally an annular core13has its round steel wire12form a loop where a round steel wire circling 2 to 10 times lies side by side, it is shown while having its structure left out for convenience.

Firstly, in a state ofFIG.12(a), a cassette56lies on one side of a turning plane74of an annular core13outside a ring of the annular core13. On this occasion, the round steel wire12is made to go along an outer circumference of the annular core13with pinch roller portions60a,60b, a roller61. By the pinch roller portions60a,60b, and the roller61rotated, the round steel wire12is, as the annular core13turns, drawn out of the cassette56and drawn in toward the annular core13.

To start from a state ofFIG.12(a), while an annular core13is turned in a circumferential direction with pinch roller portions60a,60band a roller61, a cassette56is moved to an inner side of a ring of the annular core13with a first cassette movement mechanism54. This makes the state turn into that ofFIG.12(b).

Further, to start from a state ofFIG.12(b), while an annular core13is turned in a circumferential direction, a cassette56is moved to another side of a turning plane74of the annular core13with a second cassette movement mechanism55. This makes the state turn into that ofFIG.12(c). Then, at pinch roller portions60a,60band a roller61, a round steel wire12is spirally wrapped up on the annular core13by half a circle thereof only.

Then, to start from a state ofFIG.12(c), while an annular core13is turned in a circumferential direction, a cassette56is moved to an outer side of a ring of the annular core13with a first cassette movement mechanism54. This makes the state turn into that ofFIG.12(d).

Further, to start from a state ofFIG.12(d), while an annular core13is turned in a circumferential direction, a cassette56is moved to one side of a turning plane74of the annular core13with a second cassette movement mechanism55. This makes the state turn into that ofFIG.12(a). Then, at pinch roller portions60a,60band a roller61, a round steel wire12is spirally wrapped up on the annular core13by half a circle thereof further. Thereby, it follows that a round steel wire12has circled once on the annular core13.

On repeating a process step ofFIGS.12(a)˜(d) and moving a cassette56while turning an annular core13, a round steel wire12is spirally wrapped up on an outer circumference of the annular core13as a side wire14. In some cases, by reversely repeating a process step ofFIGS.12(a)˜(d), a round steel wire12is allowed to be wrapped up on the annular core13in a stranding direction reverse to a stranding direction that can be obtained by forward repeating the process step ofFIGS.12(a)˜(d).

For example, a cable bead11shown inFIG.2is manufactured by repeating a process ofFIGS.12(a)˜(d) in a forward direction to wrap up a first layer of a round steel wire12on an annular core13by S twist as a side wire14, cut the round steel wire12temporarily, and fix the round steel wire12at its end portion with an adhesive agent or the like. Additionally, it is also allowable to manufacture a cable bead16shown inFIG.4by making the cable bead11be an annular core13, and repeating, in a direction opposite to that for a side wire14of the cable bead11, a process of wrapping up a round steel wire12, to wrap it up as a side wire15being a second layer. In addition, further, in a case where a round steel wire12is laminated in three layers or more as a side wire14, it is also allowable to manufacture a cable bead having a side wire layer in three layers or more, by alternately repeating S twists and Z twists in a direction opposite to that in which a side wire of a cable bead16to be an annular core13is wrapped up.

Further, a manufacturing device200shown inFIGS.10(a)˜(c) is provided with each one set of a first cassette movement mechanism54, a second cassette movement mechanism55, a cassette56accommodating a round steel wire12, bilaterally symmetrically with a turning axis58of an annular core13centered as seen in front, two sets thereof in total, and therefore, a round steel wire12can be spirally wrapped up on the annular core13in a process ofFIGS.12(e)˜(h) by turning the annular core13reversely to a process ofFIGS.12(a)˜(d), for example.

Therefore, it can, in a case of manufacturing a multilayer cable bead, laminate a round steel wire12immediately without adjusting the manufacturing device200, and besides, can manufacture a multilayer cable bead efficiently by making, if necessary, such a repetition as (a)˜(d)→(e)˜(h)→(a)˜(d)→(e)˜(h)→ . . . . Especially, efficiency of a cassette56filled with a round steel wire12in supplying the manufacturing device200is raised, and besides, especially, when on an occasion of wrapping up a round steel wire12different in wire diameter, a cassette56on one side is filled with the round steel wire12different in wire diameter, a wrapping process can be immediately entered without the cassette56being replaced, and by that or the like, a significant effect of productivity enhancement is achieved.

[Part 3, Manufacturing Device Structure]

A third embodiment of a manufacturing device according to the present invention is explained on the basis ofFIG.13andFIGS.14(a)˜(c). This explanation is also an explanation of a third embodiment of a manufacturing method according to the present invention.

(Overall Structure)

A manufacturing device300exemplified inFIG.13comprises an annular core formation mechanism301for forming an annular core13by making a round steel wire12, without stranding it, circle 2 to 10 times side by side, and a side wire wrapping mechanism302of spirally wrapping up a round steel wire12consecutive from the annular core13around the annular core13without cutting it. The side wire wrapping mechanism302is, like the side wire wrapping mechanism202shown inFIG.7, provided with a first cassette movement mechanism22, a second cassette movement mechanism23, and a cassette24accommodating a round steel wire12.

(Annular Core Formation Mechanism)

As shown inFIG.13andFIGS.14(a)˜(c), an annular core formation mechanism301is provided with a drum80made up of a former allowed to be divided into four in a circumferential direction while allowed to have its diameter increased and decreased, a turning mechanism81of turning the drum80in a circumferential direction, and a movement mechanism82of allowing an annular core13to move between a position at which it is delivered to a process of wrapping up a round steel wire12on the annular core13and a position at which it does not interfere in a process of wrapping up the round steel wire12.

(Actions of Manufacturing Devices)

A manufacturing device300configured as above firstly increases in diameter a drum80of an annular core formation mechanism301in accordance with a cable bead inner diameter specification as shown inFIG.14(a), draws a round steel wire12out of a cassette24, temporarily fixes the round steel wire at its end portion to the drum80with an adhesive tape or the like, and wraps up the round steel wire12on the drum80by making it, without stranding it, circle 2 to 10 times side by side so that an annular core13is formed. A turning drive of the drum80on that occasion is allowed to be either a manual or motor drive. After the annular core13is formed, the round steel wire12is, without being cut, fixed with an adhesive agent, an adhesive tape, or the like, at an endpoint of the annular core13or in a vicinity thereof, or at an optional position on the annular core so that the annular core13is not disintegrated in shape. Thereafter, as shown inFIG.14(b), the drum80has its diameter decreased for an annular core to be taken out from an annular core formation mechanism301as shown inFIG.14(c). On that occasion, the drum80is moved with a movement mechanism82up and down, right and left, forward and backward so that the annular core13is easy to set to an annular core turning mechanism302. An annular core13which is set to the annular core turning mechanism302is turned counterclockwise in a circumferential direction with a turning axis of the annular core13centered. The annular core formation mechanism301is provided with a housing29, a clamp portion30, two pairs of pinch roller portions32,33, and a presser roller34. A side wire wrapping process with a manufacturing device30according to the present embodiment is like that ofFIGS.9(a)˜(d).

Since both an annular core formation process and a side wire wrapping process can be, as described above, carried out with one manufacturing device300, an effect of enhancing productivity in manufacturing a cable bead is extremely great. Additionally, since on an occasion of forming an annular core13, the annular core can be formed along a drum adapted to an inner diameter of the cable bead, no large-scale device is required while manufacturing precision of cable bead inner diameter is enhanced, yield is improved, whereby a significant economic efficiency effect is achieved.

The above statement describes one example of a cable bead according to the present invention, and by a cable bead according to the present embodiment, the cable bead has its transverse section shaped in a substantial circle when an annular core is made up of a round steel wire having circled once. While such a cable bead being made an annular core, a multilayer cable bead obtained by spirally wrapping up a round steel wire on this annular core to make a side wire can be manufactured.

Additionally, by selecting times in number of wrapping up a side wire consecutive to arrays of a round steel wire to be an annular core on the annular core out of numbers between one and times in number (e.g., 8 times in a cable bead shown inFIG.3) at which to cover the annular core completely, a cable bead whose shape and characteristics are adjusted in accordance with characteristics requested is obtained. While such a cable bead being made an annular core, a multilayer cable bead obtained by spirally wrapping up a round steel wire on this annular core to make a side wire can be manufactured.

Additionally, by applying a taper roll as a roll or the like used for the present device, granting a taper even to a former allowed to be divided into two to six in a circumferential direction while allowed to have its diameter increased and decreased, and varying that slant as appropriate, a loop obtained by drawing a round steel wire at one end out of a cassette and making the round steel wire circle 2 to 10 times side by side is formed. On this occasion, by providing a difference in loop wrapping length between a loop corresponding to a tire width direction-inner side of a cable bead and a loop corresponding to a tire width direction-outer side thereof, a difference can be provided between a tire width direction-outer cable bead ring radius Do (mm) and a tire width direction-inner cable bead ring radius Di (mm). As a result, a cable bead whose relation to a cable bead sectional maximum width Wm (mm) meets 0≤(Do−Di)/Wm≤√3/2 can be manufactured while stabilized in shape, high in yield rate, and excellent in productivity.

[Part 4, Manufacturing Device Overall Structure]

A fourth embodiment of a manufacturing device according to the present invention is explained on the basis ofFIG.15. This explanation is also an explanation of a fourth embodiment of a manufacturing method according to the present invention.

(Overall Structure)

A manufacturing device400exemplified inFIG.15comprises an annular core formation mechanism401for forming an annular core13by making a round steel wire12, without stranding it, circle 2 to 10 times side by side, and a side wire wrapping mechanism402of spirally wrapping up a round steel wire12consecutive from the annular core13around the annular core13without cutting it. Like a side wire wrapping mechanism202shown inFIGS.10(a)˜(c), the side wire wrapping mechanism402is, for a first cassette movement mechanism54, a second cassette movement mechanism55, and a cassette56accommodating the round steel wire12, provided with each one set thereof bilaterally symmetrically with a turning axis58of the annular core13centered, and two sets thereof in total.

(Actions of Manufacturing Devices)

A manufacturing device400configured as described above firstly forms an annular core13by making a round steel wire12circle once or by making it, without stranding it, circle 2 to 10 times side by side, with an annular core formation mechanism401, in accordance with a process step described inFIGS.14(a)˜(c). The manufacturing device400fixes the round steel wire12with an adhesive agent, an adhesive tape, or the like, at an endpoint of the annular core13or in a vicinity thereof, or at an optional position on the annular core so that the annular core13is not disintegrated in shape. Thereafter, it takes out the annular core13from the annular core formation mechanism401, sets it to an annular core turning mechanism52, and manufactures a cable bead in accordance with a procedure like that ofFIGS.12(a)˜(h).

Since both an annular core formation process and a side wire wrapping process can be, according to a fourth embodiment, as described above, carried out with one manufacturing device400, an effect of enhancing productivity in manufacturing a cable bead is extremely great. Additionally, since on an occasion of forming an annular core13, the annular core can be formed along a drum adapted to an inner diameter of the cable bead, it requires no large-scale device while being enhanced in manufacturing precision of cable bead inner diameter, being improved in yield, whereby a significant economic efficiency effect is achieved.

Especially, efficiency of a cassette filled with a round steel wire12to be a side wire14in supplying a manufacturing device400is raised, and besides, especially, when on an occasion of wrapping up a round steel wire12different in wire diameter, a cassette56on one side is filled with the round steel wire12different in wire diameter, a wrapping process can be immediately entered without the cassette56being replaced, and by that or the like, a significant effect of productivity enhancement is achieved.

The above statement describes one example of a cable bead according to the present invention, and by a cable bead according to the present embodiment, the cable bead has its transverse section shaped in a substantial circle when an annular core is made up of a round steel wire having circled once. While such a cable bead being made an annular core, a multilayer cable bead obtained by spirally wrapping up a round steel wire around that annular core to make a side wire can be manufactured.

Additionally, by selecting times in number of wrapping up a side wire consecutive to arrays of a round steel wire to be an annular core on the annular core out of numbers between one and times in number (e.g., 8 times in a cable bead shown inFIG.3) at which to cover the annular core completely, a cable bead whose shape and characteristics are adjusted in accordance with characteristics requested is obtained. While such a cable bead being made an annular core, a multilayer cable bead obtained by spirally wrapping up a round steel wire on this annular core to make a side wire can be manufactured.

Additionally, by applying a taper roll as a roll or the like used for the present device, granting a taper even to a former allowed to be divided into two to six in a circumferential direction while allowed to have its diameter increased and decreased, and varying that slant as appropriate, a loop obtained by drawing a round steel wire at one end out of a cassette and making the round steel wire circle 2 to 10 times side by side is formed. On this occasion, by providing a difference in loop wrapping length between a loop corresponding to a tire width direction-inner side of a cable bead and a loop corresponding to a tire width direction-outer side thereof, a difference can be provided between a tire width direction-outer cable bead ring radius Do (mm) and a tire width direction-inner cable bead ring radius Di (mm). As a result, a cable bead whose relation to a cable bead sectional maximum width Wm (mm) meets 0≤(Do−Di)/Wm≤√3/2 can be manufactured while stabilized in shape, high in yield rate, and excellent in productivity.

[Part 5, Manufacturing Device Structure]

A fifth embodiment of a manufacturing device according to the present invention is explained on the basis ofFIG.16toFIG.18. This explanation is also an explanation of a fifth embodiment of a manufacturing method according to the present invention.

(Overall Structure)

A manufacturing device500according to a fifth embodiment comprises an annular core formation mechanism501for forming an annular core13by making a round steel wire12, without stranding it, circle 2 to 10 times side by side, and a side wire wrapping mechanism502of spirally wrapping up a round steel wire12consecutive from the annular core13around the annular core13without cutting it. The side wire wrapping mechanism502is, like the side wire wrapping mechanism202shown inFIG.7, provided with a first cassette movement mechanism22, a second cassette movement mechanism23, and a cassette24accommodating a round steel wire12.

(Annular Core Formation Mechanism)

As shown inFIG.16andFIG.17, an annular core formation mechanism501has one former or a drum84divided into two to six in a circumferential direction while allowed to have its diameter increased and decreased, and is provided with a cassette linkage portion85to be a center axis of the drum84and with a movement mechanism83of allowing the cassette linkage portion85to move along a turning axis of an annular core13and allowing the annular core13to move between a position at which it is delivered to a process of wrapping up a round steel wire12on the annular core13and a position at which it does not interfere in a process of wrapping up the round steel wire12. The drum84is provided with a rotating small-size roller, a recess-form groove, and so on, on a drum surface being in contact with the round steel wire12, in order to smoothly form an annular core. The side wire wrapping mechanism502is, like the side wire wrapping mechanism202shown inFIG.7, provided with a first cassette movement mechanism22, a second cassette movement mechanism23, and a cassette24accommodating a round steel wire12.

(Actions of Manufacturing Devices)

Firstly, as shown inFIG.16, in a manner that a drum84of a cassette linkage portion85is increased in diameter in accordance with a cable bead inner diameter specification, and that a round steel wire12is drawn out of a cassette24and made, without being stranded, to circle 2 to 10 times side by side so that an annular core13is formed, the round steel wire12is wrapped up on the drum84. On that occasion, as shown inFIG.16, the round steel wire12is drawn out of the cassette24and is made to go via rollers31a,31b,32a,32b,33a,33bof an annular core turning mechanism28, and the drum84increased in diameter is made to hold the annular core13. After the annular core13is formed, the round steel wire12is, without being cut, fixed with an adhesive agent, an adhesive tape, or the like, at an endpoint of the annular core13or in a vicinity thereof, or at an optional position on the annular core so that the annular core13is not disintegrated in shape. Thereafter, as shown inFIG.17, a drum84is decreased in diameter, and the drum84is, as shown inFIG.18, moved along a turning axis58to a position at which it does not interfere in a side wire wrapping process with a movement mechanism83. Further, followingly, the annular core13is turned counterclockwise in a circumferential direction with the turning axis58centered, in a form of making a ring as seen in front as inFIG.17. Then, in a similar way to a process step ofFIGS.9(a)˜(d), a cable bead is manufactured by spirally wrapping up a side wire14on the annular core13.

Since both an annular core formation process and a side wire wrapping process can be, according to a fifth embodiment, as described above, carried out with one device500, an effect of enhancing productivity in manufacturing a cable bead is extremely great. Additionally, since on an occasion of forming an annular core13, the annular core can be formed along a drum adapted to an inner diameter of the cable bead, no large-scale device is required while manufacturing precision of cable bead inner diameter is enhanced, yield is improved, whereby a significant economic efficiency effect is achieved.

The above statement describes one example of a cable bead according to the present invention, and by a cable bead according to the present embodiment, the cable bead has its transverse section shaped in a substantial circle when an annular core is made up of a round steel wire having circled once. While such a cable bead being made an annular core, a multilayer cable bead obtained by spirally wrapping up a round steel wire around that annular core to make a side wire can be manufactured.

Additionally, by selecting times in number of wrapping up a side wire consecutive to arrays of a round steel wire to be an annular core on the annular core out of numbers between one and times in number (e.g., 8 times in a cable bead shown inFIG.3) at which to cover the annular core completely, a cable bead whose shape and characteristics are adjusted in accordance with characteristics requested is obtained. While such a cable bead being made an annular core, a multilayer cable bead obtained by spirally wrapping up a round steel wire on this annular core to make a side wire can be manufactured.

Additionally, by applying a taper roll as a roll or the like used for the present device, granting a taper even to a former allowed to be divided into two to six in a circumferential direction while allowed to have its diameter increased and decreased, and varying that slant as appropriate, a loop obtained by drawing a round steel wire at one end out of a cassette and making the round steel wire circle 2 to 10 times side by side is formed. On this occasion, by providing a difference in loop wrapping length between a loop corresponding to a tire width direction-inner side of a cable bead and a loop corresponding to a tire width direction-outer side thereof, a difference can be provided between a tire width direction-outer cable bead ring radius Do (mm) and a tire width direction-inner cable bead ring radius Di (mm). As a result, a cable bead whose relation to a cable bead sectional maximum width Wm (mm) meets 0≤(Do−Di)/Wm≤√3/2 can be manufactured while stabilized in shape, high in yield rate, and excellent in productivity.

[Part 6, Manufacturing Device Structure]

A sixth embodiment of a manufacturing device according to the present invention is explained on the basis ofFIG.19. This explanation is also an explanation of a sixth embodiment of a manufacturing method according to the present invention.

(Overall Structure)

A manufacturing device600according to a sixth embodiment comprises an annular core formation mechanism601for forming an annular core13by making a round steel wire12, without stranding it, circle 2 to 10 times side by side, and a side wire wrapping mechanism602of spirally wrapping up a round steel wire12consecutive from the annular core13around the annular core13without cutting it. The annular core formation mechanism601has one former or a drum84divided into two to six in a circumferential direction while allowed to have its diameter increased and decreased, and is provided with a cassette linkage portion85to be a center axis of the drum84and with a movement mechanism83of allowing the drum84to move along a turning axis of an annular core13and allowing the annular core13to move between a position at which it is delivered to a process of wrapping up a round steel wire12on the annular core13and a position at which it does not interfere in a process of wrapping up the round steel wire12. Additionally, the drum84is provided with a rotating small-size roller, a recess-form groove, and so on, on a drum surface being in contact with the round steel wire12, in order to smoothly form an annular core. The side wire wrapping mechanism602is, for a first cassette movement mechanism54, a second cassette movement mechanism55, and a cassette56accommodating the round steel wire12, provided with each one set thereof bilaterally symmetrically with a turning axis58of the annular core13centered, and two sets thereof in total.

(Actions of Manufacturing Devices)

Firstly, as shown inFIG.19, in a manner that a drum84of a cassette linkage portion85is increased in diameter in accordance with a cable bead inner diameter specification, and that a round steel wire12is drawn out of a cassette56and made, without being stranded, to circle 2 to 10 times side by side so that an annular core13is formed, the round steel wire12is wrapped up on the drum84. On that occasion, as shown inFIG.19, the round steel wire12is drawn out of the cassette56and is made to go via rollers60a,60b,61, a pressor roller53, of an annular core turning mechanism52, and the drum84increased in diameter is made to hold the annular core13. After the annular core13is formed, the round steel wire12is, without being cut, fixed with an adhesive agent, an adhesive tape, or the like, at an endpoint of the annular core13or in a vicinity thereof, or at an optional position on the annular core so that the annular core13is not disintegrated in shape. Thereafter, a drum84is decreased in diameter, and the drum84is moved to a position at which it does not interfere in a side wire wrapping process with a movement mechanism83. Further, followingly, the annular core13is turned counterclockwise in a circumferential direction with the turning axis58centered, in a form of making a ring as seen in front as inFIG.19. Then, in a similar way to a process step ofFIGS.12(a)˜(h), a cable bead is manufactured by spirally wrapping up a side wire14on the annular core13.

Since both an annular core formation process and a side wire wrapping process can be, according to a sixth embodiment, as described above, carried out with one device600, an effect of enhancing productivity in manufacturing a cable bead is extremely great. Additionally, since on an occasion of forming an annular core13, the annular core can be formed along a drum adapted to an inner diameter of the cable bead, no large-scale device is required while manufacturing precision of cable bead inner diameter is enhanced, yield is improved, whereby a significant economic efficiency effect is achieved.

Especially, efficiency of a cassette filled with a round steel wire12to be a side wire14in supplying a manufacturing device600is raised, and besides, especially, when on an occasion of wrapping up a round steel wire12different in wire diameter, a cassette56on one side is filled with the round steel wire12different in wire diameter, a wrapping process can be immediately entered without the cassette56being replaced, and by that or the like, a significant effect of productivity enhancement is achieved.

The above statement describes one example of a cable bead according to the present invention, and by a cable bead according to the present embodiment, the cable bead has its transverse section shaped in a substantial circle when an annular core is made up of a round steel wire having circled once. While such a cable bead being made an annular core, a multilayer cable bead obtained by spirally wrapping up a round steel wire around that annular core to make a side wire can be manufactured.

Additionally, by selecting times in number of wrapping up a side wire consecutive to arrays of a round steel wire to be an annular core on the annular core out of numbers between one and times in number (e.g., 8 times in a cable bead shown inFIG.3) at which to cover the annular core completely, a cable bead whose shape and characteristics are adjusted in accordance with characteristics requested is obtained. While such a cable bead being made an annular core, a multilayer cable bead obtained by spirally wrapping up a round steel wire on this annular core to make a side wire can be manufactured.

Additionally, by applying a taper roll as a roll or the like used for the present device, granting a taper even to a former allowed to be divided into two to six in a circumferential direction while allowed to have its diameter increased and decreased, and varying that slant as appropriate, a loop obtained by drawing a round steel wire at one end out of a cassette and making the round steel wire circle 2 to 10 times side by side is formed. On this occasion, by providing a difference in loop wrapping length between a loop corresponding to a tire width direction-inner side of a cable bead and a loop corresponding to a tire width direction-outer side thereof, a difference can be provided between a tire width direction-outer cable bead ring radius Do (mm) and a tire width direction-inner cable bead ring radius Di (mm). As a result, a cable bead whose relation to a cable bead sectional maximum width Wm (mm) meets 0≤(Do−Di)/Wm≤√3/2 can be manufactured while stabilized in shape, high in yield rate, and excellent in productivity.

Effect of Embodiments

(Cable Bead Structure)

With a cable bead3(11,16,17) according to the present embodiment, for example, an annular core13is, as shown inFIGS.2to6, made up of a round steel wire12made, without being stranded, to circle 2 to 10 times side by side, and therefore, the cable bead3(11,16,17) has its transverse section shaped in a substantial ellipse. This allows a bead portion4of a tire main body1to be put into contact with a wheel rim10in a large area. As compared with JP2015-71352A, without manufacturing, in a separate process step, a cable bead to be an annular core, a cable bead3(11,16,17) can be obtained out of a round steel wire obtained by processing a section-circular metal wire to stretch it to be desirable in thickness, and therefore, the cable bead3(11,16,17) can be provided at a low price.

Additionally, since with a cable bead according to the present embodiment, an annular core is made up of a round steel wire having circled once without being stranded, the cable bead has its transverse section shaped in a substantial circle. This allows a bead portion4of a tire main body1to be put into uniform contact with a wheel rim10with large pressing force. Further, around an annular core made of one round steel wire, a cable bead where a round steel wire consecutive to the annular core is stranded in a covering manner and whose transverse section is shaped in a substantial circle is, as a side wire, and a round steel wire is, further as a side wire, stranded in a covering manner so that a plurality of layers are laminated, and thereby, uniformity of an area of contact of a bead portion4with a wheel rim10can be secured while pressing force of the bead portion4on the wheel rim10is increased. As compared with JP2015-71352A, without manufacturing, in a separate process step, a cable bead to be an annular core, a cable bead whose cable bead transverse section is shaped in a substantial circle can be obtained out of a round steel wire obtained by processing a section-circular metal wire to stretch it to be desirable in thickness, and therefore, a cable bead can be provided at a low price.

The above statement describes one example of a cable bead according to the present invention, and by selecting times in number of wrapping up a side wire consecutive to arrays of a round steel wire to be an annular core around the annular core out of numbers between one and times in number (e.g., 8 times in a cable bead shown inFIG.3) at which to cover the annular core completely, or by selecting lamination in number, a shape adapted to a property required for such a cable bead can be provided at a low price.

Additionally, by applying a taper roll as a roll or the like used for the present device, granting a taper even to a former allowed to be divided into two to six in a circumferential direction while allowed to have its diameter increased and decreased, and varying that slant as appropriate, a loop obtained by drawing a round steel wire at one end out of a cassette and making the round steel wire circle 2 to 10 times side by side is formed. On this occasion, by providing a difference in loop wrapping length between a loop corresponding to a tire width direction-inner side of a cable bead and a loop corresponding to a tire width direction-outer side thereof, a difference can be provided between a tire width direction-outer cable bead ring radius Do (mm) and a tire width direction-inner cable bead ring radius Di (mm). As a result, a cable bead whose relation to a cable bead sectional maximum width Wm (mm) meets 0≤(Do−Di)/Wm≤√3/2 can be manufactured while stabilized in shape, high in yield rate, and excellent in productivity, and at a low price.

Further, since in examples ofFIG.2andFIG.3, a round steel wire12as a side wire14is stranded in a covering manner around an annular core13made of two round steel wires12lying side by side, a cable bead11is elastically deformed in accordance with a shape of a wheel rim10. This allows a bead portion4to get into contact with the wheel rim10on a larger area.

Further, since in examples ofFIG.4andFIG.5, a round steel wire12as a side wire16is further stranded in a covering manner around a cable bead11ofFIG.2andFIG.3, a cable bead16is elastically deformed in accordance with a shape of a wheel rim10. This allows a bead portion4to get into contact with the wheel rim10on a larger area. Additionally, since in an example ofFIG.6, a round steel wire12as a side wire14is stranded in two layers in a covering manner around an annular core13(18) made of three round steel wires12lying side by side, a cable bead17is elastically deformed in accordance with a shape of a wheel rim10. This allows a bead portion4to get into contact with the wheel rim10on a larger area.

Additionally, since with a cable bead according to the present embodiment, an annular core is made up of a round steel wire having circled once, the cable bead has its transverse section shaped in a substantial circle. This allows a bead portion4of a tire main body1to be put into uniform contact with a wheel rim10with large pressing force. Further, around an annular core made of one round steel wire, a cable bead where a round steel wire consecutive to the annular core is stranded in a covering manner and whose transverse section is shaped in a substantial circle is, as a side wire, and a round steel wire is, further as a side wire, stranded in a covering manner so that a plurality of layers are laminated, and thereby, uniformity of an area of contact of a bead portion4with a wheel rim10can be secured while pressing force of the bead portion4on the wheel rim10is increased.

The above statement describes one example of a cable bead according to the present invention, and by selecting times in number of wrapping up a side wire consecutive to arrays of a round steel wire to be an annular core around the annular core out of numbers between one and times in number (e.g., 8 times in a cable bead shown inFIG.3) at which to cover the annular core completely, or by selecting lamination in number, contact area required for such a cable bead can be secured.

Additionally, when a cable bead3(11,16,17) is configured to have its tire width direction-inner cable bead ring radius Di (mm), tire width direction-outer cable bead ring radius Do (mm), and cable bead sectional maximum width Wm (mm) meet a relation of 0≤(Do−Di)/Wm≤√3/2, the cable bead can be placed in accordance with a shape of a rim portion of a tire wheel to allow a bead portion4to get into contact with a wheel rim10on a larger area.

Additionally, since a round steel wire12making up side wires14,15,19,20is stranded, a cable bead3(11,16,17) has more resilience to twisting or deformation so that a bead portion4can be pressed against a wheel rim10with uniform force all over the cable bead3(11,16,17) in a circumferential direction thereof. That is, a tire1is enhanced in uniformity.

Additionally, since with a cable bead according to the present embodiment, an annular core is made up of a round steel wire having circled once without being stranded, the cable bead has its transverse section shaped in a substantial circle. A bead portion4can be pressed against a wheel rim10with uniform force all over the cable bead in a circumferential direction thereof. That is, a tire1is enhanced in uniformity. Further, around an annular core made of one round steel wire, a cable bead where a round steel wire consecutive to the annular core is stranded in a covering manner and whose transverse section is shaped in a substantial circle is, as a side wire, and a round steel wire is, further as a side wire, stranded in a covering manner so that a plurality of layers are laminated, and thereby, a bead portion4can be pressed against a wheel rim10with larger and uniform force all over the cable bead in a circumferential direction thereof. That is, a tire1is enhanced in uniformity.

The above statement describes one example of a cable bead according to the present invention, and by selecting times in number of wrapping up a side wire consecutive to arrays of a round steel wire to be an annular core around the annular core out of numbers between one and times in number (e.g., 8 times in a cable bead shown inFIG.3) at which to cover the annular core completely, or by selecting lamination in number, a bead portion4can be pressed against a wheel rim10with force required for such a cable bead all over in a circumferential direction thereof. That is, a tire1is enhanced in uniformity.

Additionally, when a cable bead3(11,16,17) is configured to have its tire width direction-inner cable bead ring radius Di (mm), tire width direction-outer cable bead ring radius Do (mm), and cable bead sectional maximum width Wm (mm) meet a relation of 0≤(Do−Di)/Wm≤√3/2, the cable bead can be placed in accordance with a shape of a rim portion of a tire wheel so that a bead portion4can be pressed against a wheel rim10with uniform force all over the cable bead3(11,16,17) in a circumferential direction thereof. That is, a tire1is enhanced in uniformity.

Since in the present embodiment, additionally, for an annular core13, two to ten round steel wires12lying side by side or a cable bead obtained by making the two to ten round steel wires12lying side by side an annular core13is made to be an annular core13, a cable bead3(11,16,17) has its transverse section shaped in a substantial ellipse. Since a bead portion4is made to be pressed against a wheel rim10in a larger contact area, a tire main body1can be more firmly put into tight contact with the wheel rim10.

Additionally, since with a cable bead according to the present embodiment, an annular core is made up of a round steel wire having circled once without being stranded, the cable bead has its transverse section shaped in a substantial circle. Since it allows a bead portion4of a tire main body1to be put into uniform contact with a wheel rim10with large pressing force, the tire main body1can be more firmly put into tight contact with the wheel rim10. Further, around an annular core made of one round steel wire, a cable bead where a round steel wire consecutive to the annular core is stranded in a covering manner and whose transverse section is shaped in a substantial circle is, as a side wire, and a round steel wire is, further as a side wire, stranded in a covering manner, and thereby, a bead portion4can be put into contact with a wheel rim10with larger and uniform force all over the cable bead in a circumferential direction thereof, and therefore, the tire main body1can be more firmly put into tight contact with the wheel rim10.

The above statement describes one example of a cable bead according to the present invention, and since by selecting times in number of wrapping up a side wire consecutive to arrays of a round steel wire to be an annular core around the annular core out of numbers between one and times in number (e.g., 8 times in a cable bead shown inFIG.3) at which to cover the annular core completely, or by selecting lamination in number, a bead portion4can be pressed against a wheel rim10with force required for such a cable bead all over in a circumferential direction thereof, a tire main body1can be more firmly put into tight contact with the wheel rim10.

Additionally, when a cable bead3(11,16,17) is configured to have its tire width direction-inner cable bead ring radius Di (mm), tire width direction-outer cable bead ring radius Do (mm), and cable bead sectional maximum width Wm (mm) meet a relation of 0≤(Do−Di)/Wm≤√3/2, the cable bead can be placed in accordance with a shape of a rim portion of a tire wheel, and a bead portion4is made to be pressed against a wheel rim10in a larger contact area, and therefore, a tire main body1can be more firmly put into tight contact with the wheel rim10.

Additionally, since in the present embodiment, an annular core13or a cable bead as an annular core13is deformed elastically in a pliant manner in accordance with configurations exemplified inFIG.2toFIG.6, a cable bead3(11,16,17) is easily deformed elastically. Thus, a tire main body1can be pressed against a wheel rim10in a large area.

Additionally, when a cable bead3(11,16,17) is configured to have its tire width direction-inner cable bead ring radius Di (mm), tire width direction-outer cable bead ring radius Do (mm), and cable bead sectional maximum width Wm (mm) meet a relation of 0≤(Do−Di)/Wm≤√3/2, the cable bead can be placed in accordance with a shape of a rim portion of a tire wheel, and a bead portion4is made to be pressed against a wheel rim10in a larger contact area, and therefore, a tire main body1can be pressed against a wheel rim10in a larger area.

Since, thus, a cable bead3(11,16,17) according to the present embodiment firmly puts a tire main body1into tight contact with a wheel rim10, it is suitable for vehicles having their tires charged with high loads, especially, such as large-size motorcycles, large-size passenger cars, trucks, buses, aircrafts, construction/mining vehicles.

Additionally, an annular core according to the present embodiment is made up of a round steel wire having circled once, and since a cable bead whose side wire is a round steel wire consecutive from the annular core and whose transverse section is shaped in a substantial circle, and a cable bead which makes that cable bead its annular core, has its side wire laminated in a plurality of layers around the annular core, and has its side wires on layers adjacent to each other wrapped up in directions opposite to each other, and whose transverse section is shaped in a substantial circle, firmly put a tire main body1into tight contact with a wheel rim10, they are suitable for vehicles having their tires charged with high loads, especially, such as large-size motorcycles, large-size passenger cars, trucks, buses, aircrafts, construction/mining vehicles.

Additionally, a cable bead can be adjusted in accordance with characteristics required for vehicles having their tires charged with high loads from a mode of wrapping up a side wire consecutive to arrays of a round steel wire once around an annular core to a mode of wrapping it up times (e.g., 8 times in a cable bead shown inFIG.3) at which to cover the annular core completely, or a cable bead which makes that cable bead its annular core, and has its side wire wrapped up and laminated in a plurality of layers can be adjusted in accordance with characteristics required for vehicles having their tires charged with high loads and can be adjusted in cable bead strength and tight-contact force of a bead portion4to a wheel rim10, and therefore, it is suitable for vehicles having their tires charged with high loads, especially, such as motor-assisted bicycles, large-size motorcycles, large-size passenger cars, trucks, buses, aircrafts, construction/mining vehicles.

Additionally, when a cable bead3(11,16,17) is configured to have its tire width direction-inner cable bead ring radius Di (mm), tire width direction-outer cable bead ring radius Do (mm), and cable bead sectional maximum width Wm (mm) meet a relation of 0≤(Do−Di)/Wm≤√3/2, the cable bead can be placed in accordance with a shape of a rim portion of a tire wheel and can firmly put a tire main body1into tight contact with a wheel rim10, and therefore, it is suitable for vehicles having their tires charged with high loads, especially, such as large-size motorcycles, large-size passenger cars, trucks, buses, aircrafts, construction/mining vehicles.

Additionally, since a tire1comprising a cable bead3(11,16,17) according to the present embodiment has its tire main body1firmly put into tight contact with a wheel rim10with its cable bead3(11,16,17), it is suitable for vehicles having their tires charged with high loads, especially, such as large-size motorcycles, large-size passenger cars, trucks, buses, aircrafts, construction/mining vehicles.

Additionally, an annular core according to the present embodiment is made up of a round steel wire having circled once, and since a cable bead whose side wire is a round steel wire consecutive from the annular core and whose transverse section is shaped in a substantial circle, or a tire1comprising a cable bead which makes that cable bead its annular core, has its side wire laminated in a plurality of layers around the annular core, and has its side wires on layers adjacent to each other wrapped up in directions opposite to each other, and whose transverse section is shaped in a substantial circle, firmly puts, with the cable bead, a tire main body1into tight contact with a wheel rim10, it is suitable for vehicles having their tires charged with high loads, especially, such as large-size motorcycles, large-size passenger cars, trucks, buses, aircrafts, construction/mining vehicles.

Additionally, since a cable bead from a mode of wrapping up a side wire consecutive to arrays of a round steel wire once around an annular core to a mode of wrapping it up times (e.g., 8 times in a cable bead shown inFIG.3) at which to cover the annular core completely, or a tire1comprising a cable bead which makes that cable bead its annular core and has its side wires on layers adjacent to each other wrapped up in directions opposite to each other, and laminated in a plurality of layers, can be adjusted in cable bead strength and tight-contact force of a bead portion4to a wheel rim10in accordance with characteristics required for vehicles having their tires charged with high loads, especially, such as motor-assisted bicycles, large-size motorcycles, large-size passenger cars, trucks, buses, aircrafts, construction/mining vehicles, it is suitable for vehicles having their tires charged with high loads.

Additionally, when a cable bead3(11,16,17) is configured to have its tire width direction-inner cable bead ring radius Di (mm), tire width direction-outer cable bead ring radius Do (mm), and cable bead sectional maximum width Wm (mm) meet a relation of 0√(Do−Di)/Wm≤√3/2, the cable bead can be placed in accordance with a shape of a rim portion of a tire wheel, and therefore, a tire1comprising the cable bead has, with the cable bead3(11,16,17), its tire main body1firmly put into tight contact with a wheel rim10, and therefore, it is suitable for vehicles having their tires charged with high loads, especially, such as large-size motorcycles, large-size passenger cars, trucks, buses, aircrafts, construction/mining vehicles.

(Cable Bead Manufacturing Methods and Manufacturing Devices)

With manufacturing devices and manufacturing methods according to embodiments shown inFIG.7,FIGS.10(a)˜(c),FIG.13,FIG.15,FIG.16,FIG.19, an annular core13can be stabilized in shape, and further, both an annular core formation process and a side wire wrapping process can be carried out with identical equipment. Therefore, a cable bead3(11,16,17) high in efficiency of side wire wrapping work, excellent in wrapping performance, and excellent in formability so that an arraying state has no disorder can be manufactured with high productivity.

Additionally, with manufacturing devices and manufacturing methods according to embodiments shown inFIG.7,FIGS.10(a)˜(c),FIG.13,FIG.15,FIG.16,FIG.19, a cable bead whose annular core is made up of a round steel wire having circled once without being stranded, whose side wire is a round steel wire consecutive from the annular core, and whose transverse section is shaped in a substantial circle, and a cable bead which makes that cable bead its annular core, has its side wire laminated in a plurality of layers around the annular core, and has its side wires on layers adjacent to each other wrapped up in directions opposite to each other, and whose transverse section is shaped in a substantial circle, can be stabilized in shape. Further, since both an annular core formation process and a side wire wrapping process can be carried out with identical equipment, the cable bead high in efficiency of side wire wrapping work, excellent in wrapping performance, and excellent in formability so that an arraying state has no disorder can be manufactured with high productivity.

Additionally, with manufacturing devices and manufacturing methods according to embodiments shown inFIG.7,FIGS.10(a)˜(c),FIG.13,FIG.15,FIG.16,FIG.19, a cable bead from a mode of wrapping up a side wire consecutive to arrays of a round steel wire once around an annular core to a mode of wrapping it up times (e.g., 8 times in a cable bead shown inFIG.3) at which to cover the annular core completely, or a cable bead which makes that cable bead its annular core, and has its side wire wrapped up and laminated in a plurality of layers, can be stabilized in shape. Further, since both an annular core formation process and a side wire wrapping process can be carried out with identical equipment, the cable bead high in efficiency of side wire wrapping work, excellent in wrapping performance, and excellent in formability so that an arraying state has no disorder can be manufactured with high productivity.

Additionally, by applying a taper roll as a roll or the like used for manufacturing devices and manufacturing methods according to embodiments shown inFIG.7,FIGS.10(a)˜(c),FIG.13,FIG.15,FIG.16,FIG.19, granting a taper even to a former allowed to be divided into two to six in a circumferential direction while allowed to have its diameter increased and decreased, and varying that slant as appropriate, a loop obtained by drawing a round steel wire at one end out of a cassette and making the round steel wire circle 2 to 10 times side by side is formed. On this occasion, by providing a difference in loop wrapping length between a loop corresponding to a tire width direction-inner side of a cable bead and a loop corresponding to a tire width direction-outer side thereof, a difference can be provided between a tire width direction-outer cable bead ring radius Do (mm) and a tire width direction-inner cable bead ring radius Di (mm). As a result, a cable bead whose relation to a cable bead sectional maximum width Wm (mm) meets 0≤(Do−Di)/Wm≤√3/2 can be provided while stabilized in shape, high in yield rate, and excellent in productivity, and at a low price.

By using the manufacturing devices and manufacturing methods above, cable beads where, on various conditions, an annular core13is really made of 1 to 8 rows of a round steel wire12while a round steel wire12to form a side wire is layered in one, two three, six, eight, twenty, have been made, and evaluated in productivity.

In order to enhance a productivity index (index showing in number, pieces of good products of cable beads allowed to be produced for a unit time), a mechanism that a wire to be wrapped up as an annular core is allowed to be measured in length is, firstly as shown inFIG.7,FIGS.10(a)˜(c), provided by attaching, in an annular core turning mechanism of turning an annular core or a cable bead in a circumferential direction, a rotary encoder to one pinch roller that can turn an annular core or a cable bead forward/reversely as an annular core formation mechanism. A mechanism of marking, when a wire wrapping length set is reached, a wire surface at such a location in linkage with the rotary encoder above is provided as necessary. Otherwise, a mechanism of turning a drum divided into two to six and allowed to have its diameter increases and decreased is provided as an annular core formation mechanism, as shown inFIG.13,FIG.15. Additionally, to provide, as an annular core formation mechanism, a mechanism that can move one former or a drum divided into two to six while allowed to have its diameter increased and decreased, with its center axis along a turning axis of an annular core, and move the annular core between a position at which to wrap up a round steel-wire side wire on the annular core and a position at which not to interfere in a process of wrapping up a round steel-wire side wire on the annular core, and to have, further, an annular core turning mechanism, a first cassette movement mechanism, and a second cassette movement mechanism, as shown inFIG.16,FIG.19, has turned out to stabilize shapes and be effective for enhancing productivity for good products, especially, on producing a multilayer cable bead shaped in a substantial circle, or shaped in a substantial ellipse.

Additionally, to provide two sets, as shown inFIGS.10(a)˜(c),15,19, for first cassette movement mechanisms and second cassette movement mechanisms has turned out to further save labor for taking steps and be effective for enhancing productivity for good articles.

Additionally, by applying a taper roll as a roll or the like used for manufacturing devices shown inFIG.7,FIG.13,FIG.16and manufacturing methods according to the present invention, and granting a taper even to a former allowed to be divided into two to six in a circumferential direction while allowed to have its diameter increased and decreased, and further, making a cable bead whose (Do−Di)/Wm is 0.15, 0.70, 0.85 in a mode of a cable bead3(17) shown inFIG.6, evaluation on productivity has been made. As a result, this has turned out to stabilize shapes and be effective for enhancing productivity for good products.

Additionally, to provide two sets, as shown inFIGS.10(a)˜(c),15,19, for first cassette movement mechanisms and second cassette movement mechanisms has turned out to further save labor for taking steps and be effective for enhancing productivity for good articles.

Embodiment Example

In order to confirm an effect for a tire according to the present invention, comparison was made on bead unseating (hereinafter, abbreviated as BUS) values as shown in Table 1 between tires to which cable beads within the scope of the present invention are applied and tires to which conventional cable beads are applied. Sizes of tires to be evaluated were set to be 6.5R/20, 11.00/R20, 205/50R15, 26×1.95. The BUS test is a BUS test of JISD4230 (1998 edition). For evaluation, section area and breaking strength of cable beads formed by using as an annular core, a conventional soft steel wire containing carbon at approximately 0.1 mass % and using as a side wire, a high-carbon steel wire containing carbon at approximately 0.7 mass %, and loads just before bead portions of tires are detached from bead seats of rims, were measured. Additionally, indexes are represented with measurement values of tires of conventional examples lying at 100, and cable beads formed out of only high-carbon round steel wires manufactured with wires being adjusted in diameter so as to be similar to conventional examples in section area are compared, in strength and BUS value, with the conventional examples. It is shown that the larger the indexes are in value, the higher the strength is and the better the BUS is.

TABLE 1EmbodimentComparativeEmbodimentComparativeEmbodimentExample NO.Example 1example 2Example 3example 4Example 5BeadCoreSteel type0.720.520.720.100.72Wire diameter1.621.621.9232.36Strength1900160019005901900ModeAn annular core beingSame as leftAn annular core beingWelding ringAn annular core beingmade up of two coremade up of one coremade up of three corewires lying side by side,wire, and side wirewires lying side byand a side wireconsecutive thereto andside, and a side wireconsecutive thereto andwrapped up 5 timesconsecutive theretowrapped up 8 timesand wrapped up 10timesSide wireSteel type0.720.520.720.710.72Wire diameter1.621.621.921.52.36Strength19001600190019001900ModeA side wire notSame as leftA side wire notSide wiresA side wire notconsecutive with a sideconsecutive with a sidemade ofconsecutive with awire of an annular core,wire of an annular core,nine/fifteenside wire of an annularhaving its wrappinghaving its wrappingside wirescore, having itsdirections being oppositedirections being oppositewrapped up inwrapping directionsto each other, andto each other, andtwo layersbeing opposite to eachwrapped up 14 timeswrapped up 11 timesother, and wrapped up16 timesStructureConfiguration(2 + 8) × ϕ1.62 +Same as left(1 + 5) × ϕ1.92 +1 × ϕ3 +(3 + 10) × ϕ2.36 +14 × ϕ1.6211 × ϕ1.92(9 + 15) × ϕ1.516 × ϕ2.36Configuration diagramFIG. 5FIG. 5——FIG. 6Area index100100100100101Breaking strength index11194111100113Section shapeEllipticalEllipticalCircularCircularEllipticalTireBUS index11385109100116Tire shape6.5R2011.00R20ComparativeEmbodimentComparativeComparativeExample NO.example 6Example 7example 8example 9BeadCoreSteel type0.100.720.10—Wire diameter51.432.2—Strength5901900590—ModeWelding ringMade up of two coreWelding—wires lying side byringside, and side wireconsecutive theretoand wrapped up 8timesSide wireSteel type0.720.720.10.72Wire diameter2.31.431.40.96Strength1900190019001900ModeSide wiresA side wire notSide wiresThree pieces ofmade of eleven/consecutive with amade ofstranded structuresseventeen sideside wire of aneight sidewires wrappedannular core, havingwiresup in two layersits wrappingwrapped updirections beingin one layeropposite to eachother, and wrapped upStructureConfiguration1 × ϕ5 +2 × ϕ1.43 +1 × ϕ2.2 +(1 × 3) × ϕ0.96(11 + 17) × ϕ2.28 × ϕ1.438 × ϕ1.4Configuration diagram—FIG. 3——Area index100100100100Breaking strength index100124100100Section shapeCircularEllipticalCircularBales-pilingTireBUS index100118100100Tire shape11.00R20205/50R1526 × 1.95EmbodimentEmbodimentEmbodimentExample NO.Example 10Example 11Example 12BeadCoreSteel type0.720.720.72Wire diameter1.180.960.96Strength190019001900ModeMade up of one coreMade up of two coreAn annular core beingwirewires lying side bymade up of one coresidewire, and one sidewire consecutivetheretoSide wireSteel type0.720.720.72Wire diameter1.180.960.96Strength190019001900ModeA side wireA side wireA side wire notconsecutive with aconsecutive with aconsecutive with acore wire of ancore wire of anside wire of an annularannular core andannular core andcore, having itswrapped up oncewrapped up oncewrapping directionsbeing opposite to eachother, and wrapped uponceStructureConfiguration(1 + 1) × ϕ1.18(2 + 1) × ϕ0.96(1 + 1) × ϕ0.96 +1 × ϕ0.96Configuration diagram———Area index101100100Breaking strength index142150150Section shapeOblateOblateOblateTireBUS index116127131Tire shape26 × 1.95

Although tires according to Embodiment examples 1, 3 to which the present invention is applied are similar in cable bead section area to that according to Comparative example 4, which is a conventional type, they are high in breaking strength, and especially, in Embodiment example 1, their section areas are oblate, and therefore, their BUS values are good.

Although Comparative example 2 which lies outside the technical scope of the present invention is similar in shape to Embodiment example 1, it is so low in carbon content that its round steel wire to form a cable bead does not reach, in strength, a class of 1800 Mpa, and therefore, it is deficient in strength as a cable bead and inferior even in BUS value to a cable bead shaped conventionally. Similarly, Embodiment example 5, as compared with Comparative example 6 which is a conventional type and Embodiment example 7, as compared with Comparative example 8 which is a conventional type, are better in strength and BUS value.

That is, a cable bead according to the present invention is high in force by which to press a bead against a rim and it has been confirmed that high performance of the cable bead was achieved.

Additionally, since a motor-assisted family-oriented bicycle is loaded with a child, shopping luggage, and so on in its vehicle front and rear, it is highly loaded on its tires and needs to have its BUS value enhanced, but since bead portions of their tires are small, a strand bead (Comparative example 9) configured as in Comparative examples 1+3 has been conventionally used. By configuring cable beads as in Embodiment examples 10, 11, 12 of the present invention, BUS values are allowed to be significantly improved and it is confirmed that contribution thereby to enhancing tires in safety is great.

Additionally, in order to confirm an effect for a tire according to the present invention, comparison was made on bead unseating (hereinafter, abbreviated as BUS) values as shown in Table 2 between tires to which cable beads within the scope of the present invention where a cable bead whose (Do−Di)/Wm is 0.15, 0.70, 0.85 is further made in a mode of a cable bead3(17) are applied and tires to which cable beads outside the technical scope of the present invention and conventional ones are applied. Sizes of tires to be evaluated were set to be 11.00/R20. The BUS test is a BUS test of JISD4230 (1998 edition). For evaluation, section area and breaking strength of cable beads formed by using as an annular core, a conventional soft steel wire containing carbon at approximately 0.1 mass % and using as a side wire, a high-carbon steel wire containing carbon at approximately 0.7 mass %, and loads just before bead portions of tires are detached from bead seats of rims, were measured, and indexes are represented with measurement values of tires of conventional examples lying at 100, and cable beads formed out of only high-carbon round steel wires manufactured with wires being adjusted in diameter so as to be similar to conventional examples in section area are compared, in strength and BUS value, with the conventional examples. It is shown that the larger the indexes are in value, the higher the strength is and the better the BUS is.

TABLE 2ExampleEmbodimentEmbodimentEmbodimentComparativeComparativeComparativeNo.Example 13Example 14Example 15example 16example 17example 18BeadCoreSteel type0.72Same as leftSame as leftSame as leftSame as left0.1Wire diameter2.36Same as leftSame as leftSame as leftSame as left5Strength1900Same as leftSame as leftSame as leftSame as left590ModeAn annular core being madeSame as leftSame as leftSame as leftSame as leftWelding ringup of three core wires lyingside by side, and a side wireconsecutive thereto andwrapped up 10 timesSide wireSteel type0.72Same as leftSame as leftSame as leftSame as left0.72Wire diameter2.36Same as leftSame as leftSame as leftSame as left2.3Strength1900Same as leftSame as leftSame as leftSame as left1900ModeA side wire not consecutiveSame as leftSame as leftSame as leftSame as leftSide wires madewith a side wire of an annularof eleven/core, having its wrappingseventeen sidedirections being opposite towires wrapped upeach other, and wrapped upin two layers16 timesStructureConfiguration(3 + 10) × ϕ2.36 +Same as leftSame as leftSame as leftSame as left1 × ϕ5 +16 × ϕ2.36(11 + 17) × ϕ2.2Configuration diagramFIG. 6Same as leftSame as leftSame as leftSame as left—Area index101Same as leftSame as leftSame as leftSame as left100Breaking strength index113115114113112100(Do − Di)/Wm0.150.700.85−0.10.910Section shapeEllipticalSame as leftSame as leftSame as leftSame as leftCircularTireBUS index1161191219895100Tire shape11.00R20

Although Embodiment examples 13 to 15 to which the present invention is applied are similar in section area to Comparative example 18 which is a conventional type, they are high in breaking strength and good in BUS value.

Although Comparative example 16 which lies outside the technical scope of the present invention is similar in shape to Embodiment example 1, it goes beyond the scope of the present invention since its value of (Do−Di)/Wm is a negative value, and therefore, it is inferior to cable beads shaped conventionally even in BUS value since its placement of cable beads is not adapted to a wheel rim portion in shape. Similarly, Comparative example 17 goes beyond the upper limit of the scope of the present invention in value of (Do−Di)/Wm, and therefore, it is inferior to cable beads shaped conventionally even in BUS value since its placement of cable beads is not adapted to a wheel rim portion in shape.

That is, a cable bead according to the present invention is high in force by which to press a bead against a rim and it has been confirmed that high performance of the cable bead was achieved.

Followingly, influences that configurations of cable beads have on productivity have been searched. Results thereof are shown in Table 3. Cable beads have been manufactured with a manufacturing device shown inFIG.7, and are compared in yield productivity for good products having no wrapping disorder in the cable beads, per unit time. Since cable beads according to Comparative examples 22, 23 which lie outside the technical scope of the present invention are less likely to be stabilized in shape when being manufactured than those according to Embodiment examples 19, 20, 21, 24, 25, 26 which lie within the technical scope of the present invention, Comparative examples 22, 23 which are in a shape outside the technical scope of the present invention are extremely low in productivity in a case where the yield productivity for good products having no wrapping disorder in the cable beads, per unit time (hereinafter, referred to as productivity index) of Embodiment 1 is set to 100. As above, it is confirmed that structures of cable beads according to the present invention not only enhance performance of the cable beads but also are high in productivity.

TABLE 3Shapes of cable beadsWays of constrainingend portions of steelFeatures of round steel wireswiresCarbonWireNumber ofNumber ofSide wirescontentdiameterTSSurfacecores lyinglayers ofconsecutive withClassificationNo(%)(mm)(MPa)treatmentalongsideside wiresannular coresEmbodiment190.72% C1.21900Brass plating21Adhesive agentExampleEmbodiment200.72% C1.22100Brass plating410Adhesive agentExampleEmbodiment210.72% C1.21900Electrolytic zinc710Adhesive agentExamplephosphate coatingComparative220.72% C1.22100Brass plating121Adhesive agentExampleComparative230.72% C1.22100Brass plating1110Adhesive agentExampleEmbodiment240.72% C1.22000Bronze plating11Bronze-platedExamplesteel spliceEmbodiment250.72% C1.22000Bronze plating13Bronze foil tapeExampleEmbodiment260.72% C1.22000Bronze plating120Adhesive agentExampleShapes of cable beadsWays of constrainingend portions of steelwiresSide wires made of twoTransverse sectionProductivityClassificationNolayers or moreshapeindexesEmbodiment19—Substantially100ExampleellipticalEmbodiment20Brass sleeve tubeSubstantially100ExampleellipticalEmbodiment21Adhesive agent + threadSubstantially96ExampleellipticalComparative22Brass sleeve tubeSubstantially32ExampleellipticalComparative23Adhesive agentSubstantially42ExampleellipticalEmbodiment24—Substantially100ExamplecircularEmbodiment25Bronze sleeve tubeSubstantially100ExamplecircularEmbodiment26Adhesive agentSubstantially95Examplecircular

As shown in Table 4, cases where cable beads which belong to the technical scope of the present invention are produced with equipment described in JP3657599B which does not belong to the technical scope of the present invention have their productivity indexes set to 100 and are made to be comparative examples, while cases where they are produced with manufacturing devices according toFIG.7,FIGS.10(a)˜(c),FIG.13,FIG.15,FIG.16,FIG.19are made to be embodiment examples.

It can be seen that Embodiment examples 27, 29, 30, 32, 33, 34, 35, 37, 38, 39, 40, 41, 43, 45, 46, 47, 49, 50, 52, 53 are significantly higher in productivity than Comparative examples 28, 31, 36, 42, 44, 48, 51, 54 which do not belong to the technical scope of the present invention.

TABLE 4Features of round steel wiresShapes of cable beadsCarbonWireNumber ofNumber ofcontentdiameterTScores lyinglayers of sideClassificationNo.(%)(mm)(MPa)Surface treatmentalongsidewiresEmbodiment Example270.72% C1.22100Bronze plating13Comparative Example280.72% C1.22100Bronze plating13Embodiment Example290.72% C1.22100Bronze plating13Embodiment Example300.72% C1.22100Bronze plating21Comparative Example310.72% C1.22100Brass plating21Embodiment Example320.72% C1.22100Bronze plating21Embodiment Example330.72% C1.22100Brass plating21Embodiment Example340.72% C1.22100Brass plating21Embodiment Example350.72% C1.22100Brass plating22Comparative Example360.72% C1.22100Brass plating22Embodiment Example370.72% C1.22100Brass plating22Embodiment Example380.72% C1.22100Brass plating22Embodiment Example390.72% C1.22100Brass plating22Embodiment Example400.72% C1.22100Brass plating22Embodiment Example410.72% C1.22100Brass plating32Comparative Example420.72% C1.22100Brass plating32Embodiment Example430.72% C1.22100Brass plating53Comparative Example440.72% C1.22100Brass plating53Embodiment Example450.72% C1.22100Brass plating53Embodiment Example460.95% C1.23000Bronze plating36Embodiment Example470.95% C1.23000Bronze plating36Comparative Example480.95% C1.23000Bronze plating36Embodiment Example490.72% C1.22100Brass plating18Embodiment Example500.72% C1.22100Brass plating18Comparative Example510.72% C1.22100Brass plating18Embodiment Example520.72% C1.52000Brass plating820Embodiment Example530.72% C1.52000Brass plating820Comparative Example540.72% C1.52000Brass plating820Shapes of cable beadsWays of constraining end portions of steel wiresSide wires consecutive withSide wires made of two layersClassificationNo.annular coresor moreEmbodiment Example27Bronze-plated steel spliceBronze-plated steel sleeve tubeComparative Example28Bronze-plated steel spliceBronze plated steel sleeve tubeEmbodiment Example29Bronze-plated steel spliceBronze-plated steel sleeve tubeEmbodiment Example30Bronze foil tapeBronze sleeve tubeComparative Example31Bronze foil tapeBrass sleeve tubeEmbodiment Example32Bronze foil tapeBronze sleeve tubeEmbodiment Example33Bronze foil tapeBrass sleeve tubeEmbodiment Example34Bronze foil tapeBrass sleeve tubeEmbodiment Example35Adhesive agentBrass sleeve tubeComparative Example36Adhesive agentBrass sleeve tubeEmbodiment Example37Adhesive agentAdhesive agentEmbodiment Example38Adhesive agentAdhesive agentEmbodiment Example39Adhesive agentAdhesive agentEmbodiment Example40Adhesive agentAdhesive agentEmbodiment Example41Adhesive agentBrass sleeve tubeComparative Example42Adhesive agentBrass sleeve tubeEmbodiment Example43Adhesive agentAdhesive agentComparative Example44Adhesive agentAdhesive agentEmbodiment Example45Adhesive agentAdhesive agentEmbodiment Example46Bronze foil tapeBronze foil tapeEmbodiment Example47Bronze foil tapeBronze foil tapeComparative Example48Bronze foil tapeBronze foil tapeEmbodiment Example49Brass sleeve tubeAdhesive agentEmbodiment Example50Brass sleeve tubeAdhesive agentComparative Example51Brass sleeve tubeAdhesive agentEmbodiment Example52Adhesive agentAdhesive agent + threadEmbodiment Example53Adhesive agentAdhesive agent + threadComparative Example54Adhesive agentAdhesive agent + threadManufacturing conditionsDiagramsAnnular coreNumber ofProductivityClassificationNo.of devicesformation mechanismcassettesindexesEmbodiment Example27FIG. 7Rotary encoder1112Comparative Example28—None1100Embodiment Example29FIG. 7Rotary encoder +1115Marking deviceEmbodiment Example30FIG. 7Rotary encoder1108Comparative Example31—None1100Embodiment Example32FIG. 7Rotary encoder +1109Marking deviceEmbodiment Example33FIG. 13Divided drum1112Embodiment Example34FIG. 16Divided drum1111Embodiment Example35FIG. 7Rotary encoder11207Comparative Example36—None1100Embodiment Example37FIG. 10Rotary encoder2129Embodiment Example38FIG. 10Rotary encoder +2131Marking deviceEmbodiment Example39FIG. 15Divided drum2141Embodiment Example40FIG. 19Divided drum2136Embodiment Example41FIG. 7Rotary encoder1116Comparative Example42—None1100Embodiment Example43FIG. 13Divided drum1119Comparative Example44—None1100Embodiment Example45FIG. 16Divided drum1122Embodiment Example46FIG. 10Rotary encoder2136Embodiment Example47FIG. 15Divided drum2139Comparative Example48—None1100Embodiment Example49FIG. 19Divided drum2142Embodiment Example50FIG. 7Rotary encoder +1118Marking deviceComparative Example51—None1100Embodiment Example52FIG. 10Rotary encoder +2146Marking deviceEmbodiment Example53FIG. 19Divided drum2143Comparative Example54—None1100

Additionally, by applying a taper roll as a roll or the like used for manufacturing devices and manufacturing methods according to embodiments shown inFIG.7,FIGS.10(a)˜(c),FIG.13,FIG.15,FIG.16,FIG.19, granting a taper even to a former allowed to be divided into two to six in a circumferential direction while allowed to have its diameter increased and decreased, and further, making a cable bead whose (Do−Di)/Wm is 0.15, 0.70, 0.85 in a mode of a cable bead3(17) shown inFIG.6, evaluation on productivity has been made.

TABLE 5Features of round steel wiresShapes of cable beadsCarbonWireNumber ofNumber ofcontentdiameterTScores lyinglayers of sideClassificationNo.(%)(mm)(MPa)Surface treatmentalongsidewiresEmbodiment Example550.72% C1.22100Bronze plating32Embodiment Example560.72% C1.22100Bronze plating32Embodiment Example570.72% C1.22100Bronze plating32Embodiment Example580.72% C1.22100Bronze plating32Embodiment Example590.72% C1.22100Bronze plating32Embodiment Example600.72% C1.52000Bronze plating32Embodiment Example610.72% C1.22100Bronze plating32Embodiment Example620.72% C1.22100Bronze plating32Embodiment Example630.72% C1.22100Bronze plating32Embodiment Example640.72% C1.22100Bronze plating32Embodiment Example650.72% C1.22100Bronze plating32Embodiment Example660.72% C1.52000Bronze plating32Embodiment Example670.72% C1.22100Bronze plating32Embodiment Example680.72% C1.22100Bronze plating32Embodiment Example690.72% C1.22100Bronze plating32Embodiment Example700.72% C1.22100Bronze plating32Embodiment Example710.72% C1.22100Bronze plating32Embodiment Example720.72% C1.52000Bronze plating32Shapes of cable beadsWays of constraining end portions of steel wires(Do −Side wires consecutive withSide wires made ofClassificationNo.Di)/Wmannular corestwo layers or moreEmbodiment Example550.15Adhesive agentBronze sleeve tubeEmbodiment Example560.15Adhesive agentBronze sleeve tubeEmbodiment Example570.15Adhesive agentBronze sleeve tubeEmbodiment Example580.15Adhesive agentBronze sleeve tubeEmbodiment Example590.15Adhesive agentBrass sleeve tubeEmbodiment Example600.15Adhesive agentBronze sleeve tubeEmbodiment Example610.70Adhesive agentBronze sleeve tubeEmbodiment Example620.70Adhesive agentBronze sleeve tubeEmbodiment Example630.70Adhesive agentBronze sleeve tubeEmbodiment Example640.70Adhesive agentBronze sleeve tubeEmbodiment Example650.70Adhesive agentBrass sleeve tubeEmbodiment Example660.70Adhesive agentBronze sleeve tubeEmbodiment Example670.85Adhesive agentBronze sleeve tubeEmbodiment Example680.85Adhesive agentBronze sleeve tubeEmbodiment Example690.85Adhesive agentBronze sleeve tubeEmbodiment Example700.85Adhesive agentBronze sleeve tubeEmbodiment Example710.85Adhesive agentBrass sleeve tubeEmbodiment Example720.85Adhesive agentBronze sleeve tubeManufacturing conditionsAnnular coreDiagrams offormationNumber ofProductivityClassificationNo.devicesmechanismcassettesindexesEmbodiment Example55FIG. 7Rotary encoder1100Embodiment Example56FIG. 10Rotary encoder +2108Marking deviceEmbodiment Example57FIG. 13Divided drum1112Embodiment Example58FIG. 15Divided drum2121Embodiment Example59FIG. 16Divided drum1115Embodiment Example60FIG. 19Divided drum2125Embodiment Example61FIG. 7Rotary encoder1100Embodiment Example62FIG. 10Rotary encoder +2109Marking deviceEmbodiment Example63FIG. 13Divided drum1116Embodiment Example64FIG. 15Divided drum2119Embodiment Example65FIG. 16Divided drum1111Embodiment Example66FIG. 19Divided drum2131Embodiment Example67FIG. 7Rotary encoder1100Embodiment Example68FIG. 10Rotary encoder +2106Marking deviceEmbodiment Example69FIG. 13Divided drum1117Embodiment Example70FIG. 15Divided drum2129Embodiment Example71FIG. 16Divided drum1118Embodiment Example72FIG. 19Divided drum2129

Cases of being manufactured with a manufacturing device according toFIG.7have their productivity indexes set to 100 and have been compared with those ofFIGS.10(a)˜(c),FIG.13,FIG.15,FIG.16,FIG.19for evaluation. As a result, especially as inFIG.13,FIG.15,FIG.16,FIG.19, equipment that has granted a taper even to a former allowed to be divided into two to six in a circumferential direction while allowed to have its diameter increased and decreased has turned out to stabilize shapes and be effective for enhancing productivity for good products.

Additionally, to provide two sets, as shown inFIGS.15,19, for first cassette movement mechanisms and second cassette movement mechanisms has turned out to further save labor for taking steps and be effective for enhancing productivity for good articles.

The present invention is not limited by the embodiments above. That is, the present invention is represented by claims, and additionally includes meanings equivalent to the claims and all modifications thereof within such claims.