JP7189752B2 - Bead transfer device - Google Patents

Description

The present invention relates to a bead conveying device.

As a method for manufacturing a pneumatic tire, there is a method in which a green case molded by a primary molding machine is combined with a tread ring by a secondary molding machine to form a raw tire (green tire).

In the primary molding machine, after the inner liner, the sidewall and the carcass ply are wrapped around the outer periphery of the drum to form a cylindrical band body, the bead conveying device conveys the annular bead member to the outer peripheral surface of the band body. . Then, with the bead member held by the bead locking process, the band body is folded back so as to involve the bead core to form a green case.

In such a bead conveying apparatus, an apparatus for accurately conveying a bead member to a predetermined position of a band body has been proposed in order to suppress deterioration of tire performance such as tire uniformity (see, for example, Patent Document 1 below).

JP-A-57-95442

However, even if the bead member can be conveyed to an accurate position, if the bead member conveyed by the bead conveying device and the band member are insufficiently pressed against each other, an air pocket may occur between them. Molding defects may occur, or misalignment of the bead member may easily occur in the bead locking process.

SUMMARY OF THE INVENTION An object of the present invention is to provide a bead conveying device capable of press-bonding a conveyed bead member to the outer peripheral surface of a cylindrical rubber member.

A bead conveying device of the present invention is a bead conveying device that conveys a bead member having a bead filler provided radially outside an annular bead core to the outer peripheral surface of a cylindrical carcass ply, in which the bead core is sandwiched from both sides in the width direction and held. The inner peripheral ends of the pair of holding portions are positioned radially outward from the inner peripheral end of the bead core, and the radial inner surface of the bead core extends radially outward as it moves outward in the axial direction. A pair of said holding|maintenance part hold|maintains a bead member on both sides so that it may incline .

In a preferred aspect of the present invention, the pair of holding portions may hold the bead core across the maximum width position.

In another preferred aspect of the present invention, the inner peripheral end of the holding portion positioned axially outside of the tubular carcass ply is radially outward from the inner peripheral end of the holding portion positioned axially inside. may be located.

In another preferred aspect of the present invention, the length along the radial direction from the inner peripheral end of the bead core to the inner peripheral ends of the pair of holding portions may be 1 mm or more.

In another preferred aspect of the present invention, a plurality of claw portions may be brought into contact with the inner peripheral end of the bead core to center the bead core.

According to the present embodiment, the conveyed bead member can be crimped to the outer peripheral surface of the cylindrical rubber member, air pockets are less likely to occur between the bead core and the band body, and the bead member in the bead locking process can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic side view which shows the bead conveying apparatus which concerns on one Embodiment of this invention. The figure which looked at the holding|maintenance part and claw part from the axial direction of a bead member. The figure which looked at the holding|maintenance part and the nail|claw part from the axial direction of the bead member in the state which mounted the bead member on the nail|claw part. AA sectional view of FIG. Cross-sectional view of the holding portion and the claw portion in a state where the claw portion is expanded in diameter Sectional view of the holding portion and claw portion in a state where the holding portion holds the bead member FIG. 10 is a cross-sectional view of the holding portion and the pawl portion in a state where the pawl portion has moved to the retracted position after the holding portion holds the bead member; Schematic cross-sectional view of a band drum and a holding section showing a state in which a bead member is conveyed to the outside of the outer peripheral surface of the band body. Schematic cross-sectional view of a band drum and a holding part showing a state in which the band drum is expanded in diameter and a bead member is provided on the outer peripheral surface of the band body. Sectional drawing of the bead member which shows an example of the bead member which a bead conveying apparatus conveys.

A bead conveying device 10 according to an embodiment of the present invention will be described below with reference to the drawings.

The bead conveying device 10 conveys the bead member 1 to the outer peripheral surface of the cylindrical band body B formed by overlapping and winding the inner liner and the carcass ply around the band drum 11, and transports the bead member 1 to a predetermined position on the outer peripheral surface of the band body B. A device for providing a bead member 1. FIG.

The arrow X direction shown in the drawing indicates the axial direction (bead axial direction) of the bead member 1 conveyed by the bead conveying device 10, and the arrow X1 direction indicates the bead member 1 attached to the band body B. When the bead member 1 is attached to the band body B, the direction of the arrow X2 indicates the axially outer side of the bead, which is the axially outer side of the band body B. show.

The arrow Y direction shown in the drawing indicates the radial direction of the bead member 1 (bead radial direction), the arrow Y1 direction indicates the radial inside of the bead member 1, and the arrow Y2 direction indicates the diameter of the bead member 1. Indicates direction outside.

The bead member 1 to be conveyed to the band body B in this embodiment includes an annular bead core 2 and a bead filler 3 provided radially outside the bead core 2 .

As illustrated in FIG. 10, the bead core 2 is formed by winding and bundling one or more steel wires into an annular shape. The cross-sectional shape of the bead core 2 is a hexagon inclined with respect to the horizontal direction (bead axial direction X). That is, the bead radial inner side surface 4 and the bead radial outer side surface 5 of the bead core 2 are inclined at a predetermined angle θ with respect to the bead axial direction X so that the bead axial direction outer side X2 is directed toward the bead radial direction outer side Y2. . This predetermined angle θ is, for example, about 15°.

In such a bead core 2, the maximum width position is the corner portion 6 of the bead core 2 located on the inner side X1 in the bead axial direction and the corner portion 7 of the bead core 2 located on the outer side X2 in the bead axial direction. The inner peripheral end of the bead core 2 is the corner portion 8 on the bead axial direction inner side X1 of the bead radial direction inner side surface 4 . The bead radial inner surface 4 and the bead radial outer surface 5 may not be inclined with respect to the axial direction X of the bead.

As shown in FIG. 1, the band drum 11 has a large number of segments 11a divided in the circumferential direction. Each segment 11 a is formed in an arc shape forming a part of the outer peripheral surface of the band drum 11 . A cylindrical band drum 11 is formed by arranging the segments 11a in the circumferential direction. This segment 11a is made radially movable. This segment 11a moves radially to expand and contract the band drum 11 in diameter.

The bead conveying device 10 includes a moving mechanism 12 , a pair of holding portions 14 A and 14 B, a driving portion 16 , claw portions 18 and an expanding/contracting device 20 . Incidentally, as shown in FIG. 1, a pair of left and right bead conveying devices 10 are provided for one band drum 11, but the pair of left and right bead conveying devices 10 are arranged with the left and right reversed. Since the basic configuration is the same, one bead conveying device 10 will be described, and the description of the other bead conveying device 10 will be omitted.

The moving mechanism 12 includes a guide rail 22 extending parallel to the axis of the band drum 11 , and a first moving table 24 and a second moving table 26 that are movably provided along the guide rail 22 .

A band drum 11 is provided on the first moving table 24, and has a spaced position apart from the holding portions 14A and 14B that hold the bead member 1, and a position where the beads are inserted into the hollow portion of the bead member 1 from the holding portions 14A and 14B. A band drum 11 moves along guide rails 22 between a receiving position for receiving the member 1 .

A ring frame 28 is provided on the second moving table 26 , and a pair of holding portions 14 A and 14 B attached to the ring frame 28 , a driving portion 16 , a claw portion 18 and an expanding/contracting device 20 move along the guide rails 22 . Moving.

The ring frame 28 has a ring shape with a circular through hole formed in the center. The inner diameter of this through hole is larger than the outer diameter of the band drum 11 . Also, the central axis of the through hole is positioned on the same straight line as the axis of the band drum 11 .

As shown in FIG. 2, each of the holding portions 14A and 14B is configured by arranging a plurality of ring segments 14B1 in the circumferential direction. Each ring segment 14B1 is connected to an expansion/contraction device (not shown) and is movable in the radial direction of the holding portions 14A and 14B. The ring segments 14B1 forming the holding portions 14A and 14B are formed in a ring shape in which circular through holes 15A and 15B are formed by gathering together radially inward. The inner diameters of these through holes 15A and 15B are larger than the outer diameter of the band drum 11 . Further, the central axes of the through holes 15A and 15B are positioned on the same straight line as the axis of the band drum 11. As shown in FIG.

The pair of holding portions 14A and 14B are arranged with a gap in the axial direction of the through holes 15A and 15B. At least one of the pair of holding portions 14A and 14B is configured to be moved toward and away from the other holding portion by the driving portion 16 . In this example, the holding portion 14A positioned on the inner side X1 in the axial direction of the bead is connected to the driving portion 16. As shown in FIG. The driving portion 16 moves the holding portion 14B closer to the holding portion 14A positioned on the inner side X1 in the bead axial direction so that the bead core 2 of the bead member 1 is sandwiched from both sides in the bead axial direction between the pair of holding portions 14A and 14B. Hold. In addition, the drive unit 16 releases the bead core 2 held by the pair of holding portions 14A and 14B by moving the holding portion 14B away from the holding portion 14A.

In this embodiment, the inner peripheral end of the holding portion 14B on the bead axial direction outer side X2 (that is, the peripheral edge of the through hole 15B) is the inner peripheral end of the holding portion 14A on the bead axial direction inner side X1 (that is, the peripheral edge of the through hole 15A). ) on the outer side Y2 in the bead radial direction.

A claw portion 18 and an expansion/contraction device 20 are provided on one of the holding portions 14A and 14B (in this embodiment, the holding portion 14B located on the outer side X2 in the axial direction of the bead).

As shown in FIGS. 2 to 4, a plurality of (for example, three or more) claw portions 18 are provided at intervals in the circumferential direction of the holding portion 14B, and one expanding/contracting device 20 is provided for each claw portion 18. It is

Claw portion 18, mounting portion 18a inserted into through hole 15B in the vicinity of the periphery of through hole 15B, and mounting portion 18b extending to bead radial direction outside Y2 along bead axial direction outside X2 of holding portion 14B.

The bead core 2 is placed on the bead radial direction outer side Y2 of the placement portion 18a, and the bead member 1 is placed between the pair of holding portions 14A and 14B. The bead member 1 is temporarily placed on the mounting portion 18a until it is held by the pair of holding portions 14A and 14B.

The mounting portion 18b is provided with a rotating shaft 18c extending in a direction perpendicular to the bead radial direction (a tangential direction of the bead member 1). As a result, the mounting portion 18a rotates about the rotating shaft 18c.

The expansion/contraction device 20 is attached to the attachment portion 18b and moves the placement portion 18a. Specifically, the expansion/contraction device 20 includes a first cylinder 20a that moves the mounting portion 18a in the bead radial direction Y, and a second cylinder 20b that rotates the mounting portion 18a around a rotation shaft 18c.

The first cylinder 20 a moves the mounting portion 18 a between a position radially inside the bead member 1 and a position equal to the inner diameter of the bead member 1 .

The second cylinder 20b has a position where it can be inserted through the through hole 15B as shown in FIG. The mounting portion 18a is positioned between the holding portion 14B on the bead axial direction outer side X2 and the bead radial direction outer side Y2 on the through holes 15A and 15B (hereinafter this position may be referred to as a retracted position). Rotational movement around 18c.

First, as shown in FIG. 1, the band drum 11 having the band body B provided on the outer peripheral surface thereof is arranged at a spaced position apart from the holding portions 14A and 14B. At this time, the mounting portion 18a of the claw portion 18 provided on the holding portion 14B is arranged inside the inner diameter of the bead member 1 in the bead radial direction. In this state, as shown in FIGS. 3 and 4, the bead core 2 of the bead member 1 is placed on the mounting portion 18a, and the bead member 1 is temporarily placed on the mounting portion 18a.

Next, as shown in FIG. 5, the first cylinder 20a of the expansion/contraction device 20 moves the mounting portion 18a to a position equal to the inner diameter of the bead member 1. Then, as shown in FIG. At this time, the plurality of expansion/contraction devices 20 provided in the holding portion 14B center the bead core 2 by synchronously moving the plurality of claw portions 18 in the bead radial direction Y. As shown in FIG. That is, the position of the bead member 1 is adjusted so that the center of the hollow portion of the bead core 2 is positioned on the same straight line as the center axis of the through holes 15A and 15B of the holding portions 14A and 14B and the axis of the band drum 11. .

When the bead core 2 is centered in this manner, the inner peripheral ends of the holding portions 14A and 14B are positioned outward in the bead radial direction Y2 from the inner peripheral end of the bead core 2 (the corner portion 8 of the bead core 2 in this embodiment). do. A length LA along the bead radial direction Y from the inner peripheral end of the bead core 2 to the inner peripheral ends of the holding portions 14A and 14B is preferably 1 mm or more. It is more preferable that the length LB along the bead radial direction Y from the corner portion 9 of the bead axial direction outer side X2 of the bead radial direction inner side surface 4 to the inner peripheral end of the holding portion 14B is 1 mm or more.

Next, as shown in FIG. 6, the driving section 16 moves the holding section 14B closer to the holding section 14A positioned on the inner side X1 in the axial direction of the bead so that the bead core of the bead member 1 is moved between the pair of holding sections 14A and 14B. 2 are sandwiched from both sides in the axial direction of the bead. At this time, the holding portions 14A and 14B come into contact with the corner portions 6 and 7 of the bead core 2 at the maximum width position of the bead core 2 and hold the maximum width position therebetween.

When the pair of holding portions 14A and 14B hold the bead core 2 of the bead member 1, the second cylinder 20b of the expanding/contracting device 20 moves the mounting portion 18a from the mounting position to the retracted position (see FIG. 7).

The first carriage 24 of the moving mechanism 12 then moves the band drum 11 from the remote position to the receiving position (see FIG. 8). Further, if necessary, the second moving table 26 of the moving mechanism 12 may move the ring frame 28 provided with the holding portions 14A, 14B and the like to change the interval between the pair of left and right bead conveying devices 10. good.

After that, the segment 11a constituting the band drum 11 moves radially outward and expands, so that the outer peripheral surface of the band body B provided on the band drum 11, as shown in FIG. A bead member 1 is provided.

Then, when the bead member 1 is arranged on the outer peripheral surface of the band body B, the segment 11a contracts radially inward. As a result, the bead conveying device 10 holds the bead member 1 between the holding portions 14A and 14B and also holds the band body B adhered to the bead member 1 . After the first moving table 24 of the moving mechanism 12 moves the band drum 11 from the receiving position to the separating position, the bead conveying device 10 moves the band body B on which the bead members 1 are arranged to a shaping drum (not shown). transport to Then, after the bead member provided on the band body B is held by the bead locking process, the band body is folded so as to involve the bead core, and the shaping process is performed.

In the bead conveying device 10 of the present embodiment, the inner peripheral ends of the holding portions 14A and 14B are positioned radially outward Y2 from the inner peripheral end of the bead core 2 (the corner 8 of the bead core 2 in the present embodiment). Therefore, when the band drum 11 is expanded in diameter, the band body B comes into contact with the radial inner side surface 4 of the bead core 2 before coming into contact with the inner peripheral ends of the holding portions 14A and 14B, and is pressed against the bead core 2 . As a result, the band body B and the bead cores 2 can be crimped, and air is less likely to accumulate between them. positional deviation can be suppressed.

Moreover, in this embodiment, even when the band drum 11 is expanded in diameter and the bead core 2 is crimped onto the band body B, the pair of holding portions 14A and 14B can hold the bead core 2. is not carelessly displaced.

Further, in the present embodiment, the pair of holding portions 14A and 14B hold the bead core 2 across the maximum width position, so that the bead member 1 can be held stably.

Further, in the present embodiment, since the inner peripheral end of the holding portion 14B on the bead axial direction outer side X2 is located on the bead radial direction outer side Y2 from the inner peripheral end of the holding portion 14A on the bead axial direction inner side X1, the bead core 2 However, even when the bead axial direction outside X2 is inclined with respect to the bead axial direction X toward the bead radial direction outside Y2, the maximum width position of the bead core 2 is held by the pair of holding portions 14A and 14B. and the bead member 1 can be stably held.

Further, in the present embodiment, after the bead core 2 is centered by the claws 18, the bead core 2 is sandwiched and held by the pair of holding portions 14A and 14B. Position can be held.

Although the embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This novel embodiment can be embodied in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention.

DESCRIPTION OF SYMBOLS 1... Bead member, 2... Bead core, 3... Bead filler, 10... Bead conveying device, 11... Band drum, 12... Moving mechanism, 14... Holding part, 16... Drive part, 18... Claw part, 18a... Placement part, 18b...Mounting portion 20...Expansion/reduction device 20a...First cylinder 20b...Second cylinder 22...Guide rail 24...First moving table 26...Second moving table 28...Ring frame

Claims (5)

A bead conveying device for conveying a bead member provided with a bead filler radially outward of an annular bead core to the outer peripheral surface of a cylindrical carcass ply,
comprising a pair of holding portions that sandwich and hold the bead core from both sides in the width direction,
The pair of holding portions are arranged such that the inner peripheral ends of the pair of holding portions are positioned radially outward from the inner peripheral ends of the bead cores, and the radial inner side surfaces of the bead cores are inclined radially outward as they move outward in the axial direction. A bead conveying device in which a holding part holds a bead member by sandwiching it. 2. The bead conveying device according to claim 1, wherein the pair of holding portions holds the bead core across the maximum width position. 3. The apparatus according to claim 1 or 2, wherein an inner peripheral end of the holding portion positioned axially outside of the tubular carcass ply is positioned radially outward from an inner peripheral end of the holding portion positioned axially inside. bead conveying device. The bead conveying device according to any one of claims 1 to 3, wherein the length along the radial direction from the inner peripheral end of the bead core to the inner peripheral ends of the pair of holding portions is 1 mm or more. The bead conveying device according to any one of claims 1 to 4, wherein a plurality of claw portions are in contact with the inner peripheral end of the bead core to center the bead core.

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