A bead core of the present disclosure is a bead core comprising an annular body in which a strip member comprising one or more bead wires coated with a coating resin is wound and stacked, and in an axial cross section of the annular body, an interface between stacks adjacent to each other is non-linear. A manufacturing method of a bead core of the present disclosure comprises an annular body forming step of winding and stacking a strip member comprising one or more bead wires coated with a coating resin to form an annular body, and the strip member has a side that comes in contact with an adjacent stack in the annular body forming step and that is non-linear in a cross section orthogonal to an extending direction of the strip member.

A cutting device for bead core steel wire includes a first holder that holds a first blade body, a second holder that holds a second blade body, and a driver that moves one of the first holder and the second holder relative to the other of the first holder and the second holder. At least one of the first blade body and the second blade body is rod-shaped and includes a plurality of cutting edges arranged on a periphery of the at least one of the first blade body and the second blade body.

Provided is a bead core manufacturing device for manufacturing a bead core formed by annularly winding a bead wire coated with unvulcanized rubber in a plurality of turns, including a rotary support body provided to be radially expanded and retracted in a radial direction thereof and configured to allow the bead wire to be wound around an outer peripheral surface thereof; and a clamping device configured to press a winding-ending end portion of the bead wire against the bead core while sandwiching a part of the bead core, which includes the winding-ending end portion of the bead wire, in a widthwise direction thereof.

A manufacturing method of a pneumatic tire includes a vulcanizing step of vulcanizing an unvulcanized tire in a vulcanization mold. A bead core 60 of the unvulcanized tire 1 includes a bead wire bundle 62 and a coating layer 65 comprising a resin material. In the vulcanizing step, a distance L1 in a tire radial direction between a tire radially inner side surface 651 of the coating layer of the bead core and a bead base molding surface 221 of the vulcanization mold is made uniform or gradually reduced in at least a part of a tire widthwise region toward the tire widthwise inside.

A guide device includes a guideway through which a steel wire passes when the steel wire is fed to a former. The guideway includes an inner surface. At least a portion of the inner surface includes a slit or recess at a position corresponding to a direction in which the steel wire is bent.

Provided is an annular bead ring formed from a bead wire that has been subjected to wire drawing, the bead wire having a true strain of 2.80 or greater as calculated by =ln(d.sub.0/d.sub.1).sup.2, a tensile strength of 2000 MPa or greater, and a proof stress of 1700 MPa to 1980 MPa, where do is a wire diameter (mm) of the bead wire before wire drawing and di is a wire diameter (mm) of the bead wire after wire drawing.

A tire 2 includes a pair of beads 12 and a carcass 14. A core 28 of each bead 12 includes a body 34 having a hexagonal cross-section, and a cover 36 covering the body 34. The cover 36 is wrapped around the body 34, and the number of turns the cover 36 is wrapped around the body 34 is greater than or equal to one and smaller than two. The cover 36 includes a plain weave fabric obtained by interlacing warp threads 72 and weft threads 74. The warp threads 72 and the weft threads 74 intersect. An angle of the intersection is greater than or equal to 45 and not greater than 125. The warp threads 72 are inclined relative to a carcass cord 70. An angle of the inclination is greater than or equal to 22.5 and not greater than 67.5.

A method for forming a belt-like rubber sheet S by extruding rubber on a drum outer peripheral surface 3a by an extruder 2 includes: a front end forming step for forming a front end S1 having a wedge-shaped cross section; an intermediate part forming step for forming an intermediate part S2 having a desired thickness; and a rear end forming step for forming a rear end S3 having a wedge-shaped cross section by gradually decreasing an extrusion amount of the rubber to zero from a predetermined extrusion amount in a predetermined time, gradually decreasing the rotational speed of the drum outer peripheral surface 3a to zero from a predetermined rotational speed in the predetermined time, and gradually decreasing a distance from the drum outer peripheral surface 3a to a die 21 to an extrusion end distance from a predetermined distance in the predetermined time.

In a bead filler forming device configured to forma bead filler by annularly applying, to a forming surface of a rotating table, rubber extruded via a mouthpiece from an extruder in a band shaped manner, and by joining end portions of the band-shaped rubber. The mouthpiece includes a leading end surface, a discharge port which is formed in the leading end surface, a land portion which extends from the discharge port in a single cross section, and a flow rate regulating portion which is provided in an upstream side of the land portion and makes a flow rate of the rubber flowing to an outer peripheral side flow path of the land portion larger than a flow rate of the rubber flowing to an inner peripheral side flow path of the land portion.

A tire includes: a tire frame member formed in a ring shape from a frame resin material, and including a pair of bead sections, a pair of side sections, and a crown section; a ring shaped bead core that is embedded in and joined to each of the bead sections, and that is formed by a single strand, or plurality of strands, of bead cord extending in the tire circumferential direction, and covered with, and joined to, a covering resin material; and an extension portion that extends from each of the bead cores in a direction that intersects with the tire circumferential direction when viewed from a tire side face, and that is joined to the tire frame member.