JP2001277376A - Tire molding method and molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radial tire molding method by which product precision can be upgraded by mitigating the deformation distortion of a carcass cord without adversely affecting the productivity of a tire as well as a molding device used in the method. SOLUTION: A contact-bonding retainer member 4 is provided on main shafts 1a, 1b outside bead locking drums 2a, 2b through a slide mechanism 3 which transmits the rotary drive force of the main shafts 1a, 1b and is able to slide in the axial direction. The contact-bonding retainer member 4 contact-bonds and retains both side parts Wa of a carcass material W and thereby, prevents the carcass cord from being deformed and distorted, when the carcass material W fitted beforehand to the bead locking drums 2a, 2b through a bead part 5 is shaped and a laminate 6 of a belt 6a and a tread 6b is attached to the outer peripheral face of the carcass material W through a rotary roller Q and is stitched together with the carcass material W.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for molding a tire, and more particularly, to a shaping bladderless second-stage molding apparatus, which significantly reduces deformation of a carcass cord without impairing productivity. The present invention relates to a method and an apparatus for molding a tire capable of improving product accuracy.

[0002]

2. Description of the Related Art Conventionally, in a shaping bladderless second-stage molding apparatus, a laminated body of a member of a belt and a tread and a carcass green (uncured carcass) previously fixed to a bead lock drum via a bead. Material) is inflated with carcass green, and the laminate is stitched by a rotating roller to be combined.

[0003]

However, when the carcass green and the laminate of the above members are combined, when the carcass bead portion and the laminate located at the outer diameter portion have a circumferential inertia force and a stitching force. Due to the circumferential shear force of
There is a problem that a deformation distortion of the carcass cord is generated, resulting in a defective product or a loss of productivity.

An object of the present invention is to provide a tire molding method and a molding apparatus capable of reducing deformation distortion of a carcass cord and increasing product accuracy without impairing tire productivity.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a tire molding method comprising: a pair of bead lock drums provided detachably on a pair of movable main shafts; After fixing the mounted bead portion and shaping the carcass member in a toroidal shape, the member laminate on the outer peripheral surface of the carcass member is united,
When the laminate is stitched along the outer peripheral surface of the carcass material while rotating the carcass material, both side portions of the carcass material are crimped by a crimp holding member that rotates with the main shaft and can be pressed and moved in the axial direction. The point is to keep it.

In the tire forming apparatus of the present invention, a pair of detachable bead lock drums are provided on a pair of axially movable main shafts, and a pair of detachable bead lock drums are provided on the main shaft outside the bead lock drum in the axial direction. The gist of the invention is to provide a pressure holding member that is slidable and presses and holds both side portions of the carcass material mounted on the bead lock drum.

The present invention is constructed as described above, and after a laminated body of a belt and a tread is united with the outer peripheral surface of the carcass material in an inflated form of the carcass material, the both side portions of the carcass material are pressed and held by a pressing member. By pressing and holding, the deformation distortion of the carcass cord can be reduced and the productivity can be improved.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a schematic front view of a shaping bladderless second-stage molding apparatus embodying the present invention, and FIG.
A pair of bead lock drums 2a, 2b are detachably attached to the main shafts 1a, 1b, which are rotatable and relatively movable in the axial direction, at a predetermined interval. Mounted on

On the main shafts 1a and 1b outside the bead lock drums 2a and 2b, a slide mechanism 3 that transmits the rotational driving force of the main shafts 1a and 1b and slides in the axial direction.
The pressure holding member 4 is provided through the bead lock drum 2 and the bead lock drum 2.
The carcass material W previously mounted on the a and 2b via the bead portion 5 is shaped, and the laminated body 6 of the belt 6a and the tread 6b is stuck on the outer peripheral surface of the carcass material W via the rotating roller Q for stitching. At this time, both side portions Wa of the carcass material W are pressed and held to prevent deformation of the carcass cord.

The slide mechanism 3 of the crimp holding member 4
A spline 7 fitted and fixed to the main shafts 1a and 1b and a spline cylinder 8 of the crimp holding member 4 that engages with the spline 7, and the crimp holding member 4 extends in the axial direction along the spline 7. Sliding and spindle 1
The rotational driving forces a and 1b are configured to be transmitted to the pressure holding member 4 and to rotate synchronously.

An anti-slip member 10 which is pressed against both side parts Wa of the carcass material W is provided on the inner side of the tip of a disk-shaped support plate 9 fixed to the outer peripheral surface of the spline cylinder 8.
As shown in FIG. 3, the anti-slip member 10 may be a needle-like member 11 that pierces both sides Wa of the carcass material W or an unvulcanized rubber-like material that is in close contact with both sides of the carcass material W. An elastic member or the like is desirable.

On the rear end side of the spline cylinder 8, there is provided pressing means 12 such as a cylinder for pressing the anti-slip member 10 to both side parts Wa of the carcass material W,
A bearing 14 is provided at a connection portion 13 between the pressing means 12 and the spline cylinder 8 so that the pressure holding member 4 can rotate together with the main shafts 1a and 1b. The pressing means 12 is fixed to a support frame 15 or the like outside the apparatus. ing.

The pressure holding member 4 is made of a carcass material W.
The entire surface of both side parts Wa may be pressed and held. Alternatively, the pressure holding member 4 may be divided into a plurality of parts in the circumferential direction, and several places of both side parts Wa of the carcass material W may be pressed and held.

Further, the slide mechanism 3 of the pressure holding member 4
Is not limited to the above-described spline engagement, and an engagement member such as a key may be used. Further, the pressing means is not limited to a cylinder or the like, and a driving means such as a motor may be used.

Next, a radial tire molding method based on the above-described configuration will be described.

First, a pair of bead lock drums 2a, 1a, 1b, 1c, which are detachably provided on a pair of movable main shafts 1a, 1b, are detached from the main shafts 1a, 1b. The beads 5 attached to both ends of the carcass material W formed in advance are fixed to 2b.

In this state, the spindles 1a, 1b
The crimp holding member 4 released from above is
Then, air is sent into the carcass material W in this state, and shaping is performed in a toroidal shape. Thereafter, a laminate 6 of a belt 6a and a tread 6b formed in advance is attached to the outer peripheral surface of the carcass material W, and the carcass material W is rotated by the rotational driving force of the main shafts 1a and 1b. On this occasion,
The pressure holding member 4 rotates in synchronization with the main shafts 1a and 1b.

Next, the rotating carcass material W
When the laminate 6 is stitched along the outer peripheral surface of the carcass material W with the rotating roller Q with respect to the laminate 6
The two side parts Wa of the carcass material W are pressed and held by the pressure holding member 4 that rotates together with the main shafts 1a and 1b and that can be pressed and moved in the axial direction via the pressing means 12, thereby providing inertia and stitching of the laminate. The phase shift due to the shearing force during the running can be prevented, and the generation of the carcass cord wave can be prevented.

The pressing and holding member 4 by the pressing means 12
Is required to be pressed with a pressing force that does not deform the carcass cords at both side parts Wa of the carcass material W.

As described above, in the embodiment of the present invention,
When the laminated body 6 of the belt 6a and the tread 6b is stuck on the outer peripheral surface of the carcass material W and stitched by the rotating roller Q to be combined, both side parts Wa of the carcass material W are pressed and held by the pressure holding member 4. Thus, the deformation distortion of the carcass cord can be reduced and the productivity can be improved.

[0022]

According to the present invention, a pair of detachable bead lock drums are provided on a pair of axially movable main shafts as described above, and an axially A crimp holding member is provided that can slide and hold both sides of the carcass member mounted on the bead lock drum by crimping, so that the deformation of the carcass cord is reduced without impairing tire productivity and product accuracy is reduced. There is an effect that can be increased.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a shaping bladderless second-stage tire forming apparatus embodying the present invention, in which an upper portion of a center line is press-bonded to both side portions, and a lower portion of the center line is press-held. The state where the member is separated from both side parts is shown.

FIG. 2 is a side view taken along the line AA of FIG. 1;

FIG. 3 is a partial side view of the crimp holding member.

[Explanation of symbols]

 1a, 1b Spindles 2a, 2b Bead lock drum 3 Slide mechanism 4 Crimping holding member 5 Bead portion 6a Belt 6b Tread 6 Laminated body 7 Spline 8 Spline cylinder 9 Support plate 10 Slip prevention member 11 Needle member 12 Pressing means 13 Connecting portion 14 Bearing 15 Support frame W Carcass material Wa Both side parts Q Rotary roller

Claims (5)

[Claims] 1. A carcass member comprising a pair of bead lock drums detachably provided on a pair of movable main spindles, wherein bead portions mounted on both ends of a carcass member are fixed, and the carcass member is shaped in a toroidal shape. Combination of the member laminates on the outer peripheral surface of the member, and when the laminated body is stitched along the outer peripheral surface of the carcass material while rotating the carcass material, the crimp holding that rotates together with the main shaft and can be pressed and moved in the axial direction. A tire molding method in which both sides of the carcass material are pressed and held by members. 2. The pressure holding force of the pressure holding member is at least such that the phase shift due to the inertia of the laminate at the time of stitching and the shearing force at the time of stitching is prevented, and the generation of a carcass cord wave is prevented. The method according to claim 1, wherein the tire is pressure-bonded. 3. A pair of detachable bead lock drums are provided on a pair of axially movable main shafts. The bead lock drum is slidable on the main shaft outside the bead lock drum in the axial direction. A tire forming apparatus provided with a pressure holding member for pressing and holding both side portions of the mounted carcass material. 4. The press-holding member has a slip preventing member provided at the front end thereof for pressing against both side portions of the carcass member, and a pressing means provided at the rear end side for pressing the slip preventing member against both side portions of the carcass material. The tire molding apparatus according to claim 3. 5. The anti-slip member according to claim 3, wherein one of a needle-like member penetrating both sides of the carcass material, a friction member, and a rubber-like elastic member closely contacting both sides of the carcass material. The tire molding apparatus according to any one of claims 1 to 4.