JP2003080613A - Apparatus for molding belt layer of tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use an apparatus main body in common and to perform mold changing operation only by replacing a profile segment and a flat segment. SOLUTION: The moving pieces 3 provided to a rotary body 2 can selectively attach profile segments 6A and flat segments 6B in a diameter expansible and contractible manner. The number of the moving pieces 3 is same to the number of the profile segments 6A. A diameter expansion and contraction means 7 is equipped with a stopper means 24 for positioning the moving pieces 3 at the intermediate position between the innermost and outermost ends thereof to stop the same.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire belt layer forming apparatus capable of forming both a belt layer curved in a convex arc and a linear belt layer in a meridional section by only replacing segments.

[0002]

2. Description of the Related Art As a belt layer forming apparatus, for example, as shown in FIG. 8, a profile segment b for forming a belt layer a1 curved in a convex arc in a meridional section.
There is known a molding device c1 using the No. 1 and a molding device c2 using the flat segment b2 for molding the belt layer a2 having a linear shape in the meridional section as shown in FIG. The convex arcuate belt layer a1 is mainly used for a tire having a small tread curvature radius such as a tire for a motorcycle, and the linear belt layer a2 is used.
Is used for tires having a large tread radius of curvature such as four-wheel tires.

Here, the profile segment b1
Then, in order to accurately form the belt layer a1 in a convex arc shape, it is necessary to make the segments b1 continuous in the circumferential direction in the expanded state y1. Therefore, the segment b1
Is composed of two types, a first segment b1a whose both sides in the circumferential direction are asymptotic inward in the radial direction, and a second segment b1b in the opposite direction.

As a means for expanding and contracting the diameter, a cylindrical moving table which is laterally moved by a cylinder and the segments b1a and b1b are connected by two long and short types of links e1 and e2 to expand the second segment b1b. The radial movement amount from the radial state y1 is set to be larger than the movement amount of the first segment b1a. As a result, each segment b1
The diameters of a and b1b can be reduced by being displaced inward and outward in the radial direction.
At this time, the movable table laterally moves by a certain distance due to the full stroke of the cylinder.

On the other hand, in the flat segment b2,
It is necessary to support belt layers of different sizes having different diameters. Therefore, by using one kind of segment b2 and moving each segment b2 by an equal distance in the radial direction, it is possible to freely separate each segment b2 in the circumferential direction from the reduced diameter state y2 in which the segment b2 is adjacent in the circumferential direction. The diameter can be expanded or reduced to the expanded diameter state y1.

As the expansion / contraction means at this time, first and second wedge bodies f1 for engaging the laterally moving cylindrical moving table d and the segment b2 with each other in a wedge shape by the inclined surfaces,
Each segment b2 is pushed up by the horizontal movement of the moving table d. The moving distance of the moving table d can be adjusted according to the diameter of the belt layer to be created.

Thus, the profile segment b1
-There are two types of segment b1; -Segment b1 is substantially continuous in the circumferential direction in the expanded state y1;
In the reduced-diameter state y2, the positions are displaced inward and outward in the radial direction; -The radial movement amount of the first segment b1a and the movement amount of the second segment b1b are different; -The lateral movement distance of the moving base is constant On the other hand, in the flat segment b2, there is one type of segment b2; segment b2 is continuous in the circumferential direction in the reduced diameter state y2 and is separated in the circumferential direction in the enlarged diameter state y1; The amount of movement in the radial direction is the same; ・ The lateral movement distance of the moving table can be adjusted according to the diameter of the belt layer; ing.

[0008]

Therefore, in the prior art, when changing the stage from the belt layer a1 to the belt layer a2, it is necessary to replace the molding apparatus itself with a dedicated one. In addition to a large loss of efficiency, the number of molding devices has increased, which is disadvantageous in terms of space and equipment costs.

According to the present invention, it is possible to greatly improve the step-changing work efficiency, such as changing the belt layer a1 to the belt layer a2 simply by replacing the segment, and further, reducing the equipment cost such as reducing the number of devices, and It is an object of the present invention to provide a belt layer forming device for a tire that enables effective use of factory space.

[0010]

In order to achieve the above-mentioned object, the invention of claim 1 of the present application is a slide having a rotating body and a plurality of moving pieces provided on the rotating body and movable in a radial direction. Means, a plurality of segments that are attached to the moving piece and can move radially outward together with the moving piece and are aligned in the circumferential direction to form a drum-shaped outer peripheral surface that can form a belt layer of a tire by winding, And a belt layer forming apparatus for a tire, comprising a expanding / reducing means for moving a moving piece of the sliding means inward and outward in a radial direction, wherein the moving piece is a profile for forming a belt layer curved in a convex arc in a meridional section. The profile segment forming the outer peripheral surface and the flat segment forming the flat outer peripheral surface that forms the belt layer in a straight line in the meridional section can be selectively and expandably mounted. Moreover, the moving piece has the same number of profile segments as the outer circumferential surface of the profile is substantially continuous in the circumferential direction by the movement to the outermost end in the radial direction, and the number of profile segments that enables the removal of the belt layer formed by the diameter reduction. At the same time, the expansion / contraction diameter means is provided with stopper means for positioning and stopping the moving piece at an intermediate position between the innermost end and the outermost end.

According to the second aspect of the present invention, the profile segment includes a first profile segment whose both side surfaces in the circumferential direction are inwardly inclined surfaces that gradually approach inward in the radial direction, and an outer surface which is close to the inwardly inclined surface. Second facing slope
A profile segment, and the moving piece comprises an even number of first moving pieces for attaching the first profile segment and second moving pieces for attaching the second profile segment, and the second moving piece The moving amount in the radial direction is larger than that of the first moving piece, and the flat segment is attached only to the first moving piece.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.
This will be described together with the illustrated example. FIG. 1 is a cross-sectional view showing a case where a belt layer forming apparatus of the present invention is equipped with a profile segment to form a belt layer of a motorcycle tire.

In FIG. 1, a belt layer forming apparatus 1 (hereinafter referred to as forming apparatus 1) includes a rotating body 2 and this rotating body 2.
A plurality of movable pieces 3 provided on the base and movable in the radial direction
And a plurality of segments 6 that are attached to the moving piece 3 and that form an outer peripheral surface 5 for forming a belt layer, and an expanding / contracting diameter means that moves the moving piece 3 inward and outward in the radial direction together with the segment 6. 7 and.

The molding device 1 is, in this example, a device body 9
Has a horizontal support shaft 10 that is held in a cantilevered manner, and the cylindrical rotating body 2 is rotatably inserted and supported on the support shaft 10. The rotating body 2 can be rotated by a driving means (not shown) such as a motor attached to the rear end of the rotating body 2, for example, linked via a pulley 11.

As shown in FIGS. 2 to 4, a plurality of the sliding means 4 are fixed to the rotating body 2 and are arranged in the circumferential direction from the peripheral surface of the sliding means 4 to project outward in the radial direction (12 in this example). The guide shaft 12 and the moving piece 3 that is guided by each guide shaft 12 and can move in the radial direction. The moving piece 3 is formed by forming a guide hole 13A through which the guide shaft 12 is inserted, at the center of a base 13 having a prismatic shape, for example.
A mounting piece 13B for pivotally mounting a link body 17 of the expansion / contraction diameter means 7 to be described later is provided on the side surface of the.

The profile segment 6A and the flat segment 6B are selectively attached to the moving piece 3.

First, the case of the profile segment 6A will be described. The profile segments 6A move to the outermost side in the radial direction and are arranged in the circumferential direction to form a profile outer peripheral surface 5A for forming a belt. As shown in FIGS. 3 and 4, the profile outer peripheral surface 5A has a convex arcuate contour shape that is substantially the same as a belt layer that curves in a convex arc (for example, a belt layer of a motorcycle tire) in a meridional section. Further, the outer peripheral surface 5A of the profile is substantially continuous in the circumferential direction as shown in FIG. 2 in the radially expanded state Y1 which is the outermost side in the radial direction, whereby a belt layer having a convex arc shape can be accurately formed. Incidentally, in the movement inward in the radial direction, the profile segment 6A can be reduced in diameter by being displaced in the radial direction, and the molded belt layer is removed.

For this purpose, the profile segment 6A is a first profile segment 6A1 in which both side surfaces in the circumferential direction are asymptotically inward toward the radial direction, and a first profile segment 6A1 and outward facing close to the inward slope Si. Slope S
The second profile segment 6A2 is defined as o and the segments 6A1 and 6A2 are alternately arranged in the circumferential direction.

Here, the moving piece 3 comprises a first moving piece 3a for mounting each first profile segment 6A1 and a second moving piece 3b for mounting the second profile segment 6A2. That is, the moving piece 3 is configured by an even number (12 in this example) of the same number as the profile segment 6A. In this example, the first moving piece 3a and the second moving piece 3b
Although the case where and have the same shape is illustrated, the shapes may be different.

The first and second profile segments 6A
As shown in FIGS. 3 and 4, the inner surfaces of the first and the sixth A2 are fitted with fitting recesses 15 which are fitted into and held by the outer ends of the first and second moving pieces 3a and 3b in the radial direction. An insertion hole 16 is formed concentrically with the guide hole 13A so that the guide shaft 12 can be inserted and released by penetrating in the radial direction. The first and second profile segments 6A1 and 6A2 and the first and second moving pieces 3a and 3b are
It is removable by bolts.

Next, in the present embodiment, the expanding / contracting diameter means 7 has a cylindrical horizontal moving base 19 which is externally inserted into the rotary body 2, and one end of which is pinned to the front end of the horizontal moving base 19 and the other end. Is the first
Similarly to the first link body 17a that is pin-connected to the mounting piece 13B of the moving piece 3a, one end is pinned to the front end of the lateral moving base 19 and the other end is the mounting piece 1 of the second moving piece 3b.
3B and a second link body 17b that is pin-connected to 3B.

As shown in FIG. 1, the lateral moving table 19 has a cylindrical base body 19A which is externally inserted into the rotating body 2, and can rotate integrally with the rotating body 2 by, for example, a key.
It is arranged so that it can move back and forth, that is, move laterally, in the axial direction. Further, for example, a disk-shaped auxiliary plate 19B protruding in the radial direction from the peripheral surface on the rear end side is connected to the base body 19A. Since the bearing means 20 is interposed between the base 19A and the auxiliary plate 19B, the auxiliary plate 19B can be held in a non-rotating state while the base 19A rotates integrally with the rotating body 2.

The auxiliary plate 19B has a rod end 21 of a linear drive device 21 which is movable back and forth in the axial direction (lateral direction).
A attaches. The linear drive machine 21 is a cylinder in this example, and is fixed to the fixing plate 9A of the apparatus body 9. Between the fixed plate 9A and the auxiliary plate 19B, guide means 2 for guiding the auxiliary plate 19B in parallel with the axial direction.
2 intervenes. The guide means 22 has its outer end fixed to the fixed plate 9A and extends inward in the axial direction.
The guide shaft 22A described above and a guide hole 22B provided in the auxiliary plate 19B for inserting the guide shaft 22A are provided.

Therefore, the lateral movement table 19 is guided by the rod operation of the linear drive machine 21 and guided by the guide means 22 to the full stroke from the retracted position where the rod is most contracted to the advanced position where the rod is most extended. Can be moved laterally.

In this embodiment, the first link body 17a has a pitch P1 between pivot points and a mounting height difference H1 in the radial direction between the pivot points in the expanded state Y1 as shown in FIGS. , P2 of the second link body 17b and the mounting height difference H2 in the radial direction are respectively smaller.

As a result, the amount of radial movement K2 of the second moving piece 3b from the expanded state Y1 is calculated by the first moving piece 3a.
Can be made larger than the radial movement amount K1.
That is, in the diameter-reduced state Y2 in which the moving pieces 3a and 3b are the innermost ends of the respective moving pieces 3a and 3b, the respective segments 6A1 and 6A2 can avoid mutual interference such as displacement in the radial direction, thus enabling the diameter reduction. sell.

Next, the case of the flat segment 6B will be described. The flat segment 6B forms a flat outer peripheral surface 5B that forms a linear belt layer in a meridional section (for example, a belt layer of a tire for a four-wheel vehicle).

This flat segment 6B is shown in FIGS.
As shown in FIG. 5, the number of the profile segments 6A (12 in this example), which is half the number N (6 in this example), is used as one type of segment, and the first and second moving pieces 3a, One of 3b, the first in this example
The moving piece 3a is attached by a bolt. Therefore, the fitting recess 15 and the insertion hole 16 similar to the profile segment 6A are formed on the inner surface in the radial direction of the flat segment 6B.

In the flat segment 6B, the first segment
By moving the moving piece 3a to the innermost end in the radial direction, it is possible to reduce the diameters of the respective side surfaces in the circumferential direction in close proximity to each other. The surface S is formed. That is, the flat segment 6
In the present example, B indicates that the circumferential surface S is divided into approximately N equal parts (in this example, N
= 6) The outer surface of each segment is formed by the arc surface.

Further, in the outward movement in the radial direction from the reduced diameter state Y2, the flat segment 6B can be separated in the circumferential direction, and the diameter of the flat outer peripheral surface 5B can be changed according to the moving distance.
It can be adjusted according to the diameter of the belt layer. For this purpose, the expansion / contraction diameter means 7 is provided with a stopper means 24 capable of positioning and stopping the first moving piece 3a at an intermediate position between the innermost end and the outermost end thereof.

As this stopper means 24, in this example,
As shown in FIG. 5, the gap G between the head portion 22A1 of the guide shaft 22A and the auxiliary plate 19B is changed to adjust the lateral movement distance of the lateral movement table 19 from the retracted position. is doing. In this example, the stopper means 24 is, for example, a U-shaped spacer 25 that is arranged between the head portion 22A1 and the auxiliary plate 19B so as to be exchangeable, and surrounds the guide shaft 22A and also forms an auxiliary plate 19B. Attached to. As the spacer 25, those having various thicknesses depending on the diameter of the belt layer are prepared.

As the stopper means 24, various structures such as a ring-shaped one that is externally fitted to the guide shaft 22A or one that continuously changes the gap G by utilizing the screw advance / retreat can be adopted.

Although a particularly preferred embodiment of the present invention has been described above in detail, the present invention is not limited to the illustrated embodiment and can be modified into various modes.

[0034]

Since the present invention is constructed as described above,
The work efficiency of the step change can be greatly improved, such that the step change can be performed only by changing the profile segment and the flat segment. Further, since the apparatus main body can be commonly used, the number of the apparatuses can be reduced, the facility cost can be reduced, and the factory space can be effectively used.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a belt layer forming apparatus of the present invention.

FIG. 2 is a side view showing a diameter expansion state and a diameter reduction state of a profile segment, respectively.

FIG. 3 is a sectional view in the meridian direction showing the operation of the first profile segment by the expansion / contraction diameter means.

FIG. 4 is a sectional view in the meridian direction showing the operation of the second profile segment by the expansion / contraction diameter means.

FIG. 5 is an enlarged sectional view showing stopper means.

FIG. 6 is a cross-sectional view of the flat segment in the meridional direction.

FIG. 7 is a side view showing a diameter expansion state and a diameter reduction state of the flat segment, respectively.

FIG. 8 is a diagram illustrating a molding device using a conventional profile segment.

FIG. 9 is a diagram illustrating a molding apparatus using a conventional flat segment.

[Explanation of symbols]

2 rotating bodies 3 moving pieces 3a first moving piece 3b Second moving piece 4 Sliding means 5A profile outer surface 5B flat outer peripheral surface 6 segments 6A profile segment 6A1 First profile segment 6A2 Second profile segment 6B flat segment 7 Expansion and contraction means 24 Stopper means Si inward slope So outward slope

Claims (2)

[Claims] 1. A rotating body, a sliding means provided on the rotating body and having a plurality of moving pieces which can move in a radial direction, and a sliding member which is attached to the moving piece and moves radially outward together with the moving piece. A plurality of segments that can form a drum-shaped outer peripheral surface that can be formed by winding the belt layer of the tire by arranging in the direction, and an expansion / contraction diameter means that moves the moving piece of the sliding means in and out in the radial direction. A belt layer forming apparatus for a tire, wherein the moving piece forms a profile segment forming a profile outer peripheral surface for forming a belt layer curved in a convex arc in a meridional section and a belt layer forming a straight line in the meridional section. The flat segment that forms the flat outer peripheral surface can be selectively and expandably / contractably mounted, and the moving piece moves out of the profile by moving to the outermost end in the radial direction. The surface is substantially continuous in the circumferential direction, and the number of profile segments is the same as the number of profile segments that enable the removal of the belt layer formed by reducing the diameter, and the expanding / contracting diameter means sets the moving piece to the innermost end. A belt layer forming apparatus for a tire, comprising stopper means for positioning and stopping at an intermediate position between the outermost end and the outermost end. 2. The profile segment includes a first profile segment whose both side surfaces in the circumferential direction are inwardly sloping surfaces which gradually approach inward in the radial direction, and a second profile segment which is an outwardly sloping surface adjacent to the inward sloping surface. A profile segment, and the moving piece comprises an even number of first moving pieces for attaching the first profile segment and second moving pieces for attaching the second profile segment, and the second moving piece 2. The belt layer forming apparatus for a tire according to claim 1, wherein the moving amount in the radial direction is larger than that of the first moving piece, and the flat segment is attached only to the first moving piece.