JP2001315218A - Apparatus for molding belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the total number of segment remarkably. SOLUTION: An expansion/contraction means 3 for supporting the segments 2 contractably has the first and second slide fittings 5L and 5R for fitting the segments arranged alternately in the circumferential direction and the first and second actuation fittings 10L and 10R having diagonal parts 22 and 26 for moving the slide fittings 5L and 5R forward/backward in et radius direction by moving forward/backward in the rotation axis direction by engaging with the inclination parts 21 and 25 of the fittings 5L and 5R. The inclination parts 21 and 25 and the diagonal parts 22 and 26 are dislocated in the rotation axis direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt forming apparatus capable of increasing the number of belt segment divisions and forming a raw tire belt with higher precision.

[0002]

2. Description of the Related Art When manufacturing a radial tire, FIG.
As shown schematically, a plurality of belt segments a... Divided in the circumferential direction are held movably in the radial direction by expansion and contraction means, and a raw belt b as a tire forming member is used. Is formed into a cylindrical shape.

[0003] As a conventional expansion / contraction means A1 of such a belt forming apparatus A, one having a structure as shown in FIG. 6 is widely used. That is, each belt segment a
Are mounted on the outer surface in the radial direction.
A side plate e for guiding one side end of each slide fitting c inward and outward in the radial direction via a linear guide d, and each slide fitting c
A plurality of wedge-shaped operating fittings g, which engage with the radial inner edge via a linear guide d to advance and retreat the slide fitting c in the radial direction by advancing and retreating in the rotation axis direction. Is composed. The working bracket g
Are integrally attached to a sliding cylinder i which is extrapolated to the rotation shaft h.

The linear guides d, d are used, so that the operation of the slide bracket c is smooth and highly accurate, and the belt segment a is not displaced even when rotating at high speed. Can be maintained in a perfect circle.

On the other hand, in recent years, from the viewpoint of further improving the tire uniformity, it has been demanded to increase the total number (the number of divisions) of the belt segments a and make the outer peripheral surface s at the time of diameter expansion closer to a perfect circle. Have been.

[0006]

However, in the linear guide d, in order to secure necessary strength, as shown in FIG. 5, the rail portion d1 and the bearing portion d2 for receiving the rail portion have a certain width. Therefore, the number of the linear guides d... Arranged in the circumferential direction is greatly restricted in order to avoid a collision between the bearing portions d2 and d2. As a result, it was difficult to increase the total number of the belt segments a to about 24 or more in the expansion / contraction means A1, and it was not possible to sufficiently satisfy the demand.

Therefore, the present invention reduces the total number of belt segments to two while securing the above-mentioned advantages of the conventional expansion / contraction means.
An object of the present invention is to provide a belt forming apparatus which can increase the number of pieces to four or more, for example, about 36 pieces, and can further improve the roundness of the outer peripheral surface (when the diameter is increased) and improve the tire uniformity.

[0008]

In order to achieve the above-mentioned object, the invention according to claim 1 of the present application is characterized in that the outer peripheral surface is enlarged and reduced in diameter by being divided in a circumferential direction and moving in a radial direction by expansion and contraction means. A belt forming apparatus having a 2N long strip-shaped belt segment capable of forming a raw belt of a tire by expanding the diameter and removing the raw belt by reducing the diameter, wherein the expanding and contracting means includes a rotating shaft, N first and second slide fittings, each of which includes a belt segment attached on an outer surface in a radial direction and is alternately arranged in a circumferential direction, and has, on a radially inner side, an inclined portion inclined from the inside to the outside in the radial direction; First and second side plates extending radially outward from the rotation axis at both ends of the segment;
The side plate guides one end of the first slide fitting radially in and out via the first guide means, and the second side plate guides one end of the second slide piece radially in and out of the second guide means. , And by engaging with the inclined portions of the first and second slide fittings via first and second inclined guide means, respectively, the first and second slide fittings advance and retreat in the direction of the rotation axis. First and second operating brackets having slant portions for moving the first and second slide brackets in and out of the radial direction are provided, and each of the inclined portions of the first and second slide brackets is connected to the first and second slide brackets. By displacing the oblique part of the operating bracket in the direction of the rotation axis, abutment caused by the operation of the first and second guide means and abutment caused by the operation of the first and second inclined guide means are prevented. It is characterized by doing.

Further, the invention according to claim 2 is characterized in that the first and second operating brackets move forward and backward by movement of a rod extending in the direction of the rotation axis.

According to a third aspect of the present invention, the first and second guide means and the first and second inclined guide means are both formed by using linear guides.

Further, in the invention according to claim 4, the inclined portion is
It is characterized in that it is inclined at an angle of 25 ° to 45 ° with respect to the rotation axis.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view including a rotation axis J of the belt forming apparatus of the present invention, and FIG. 2 is a cross-sectional view taken along line II of FIG.

In FIG. 2, a belt forming apparatus 1 includes 2N belt segments 2 divided in a circumferential direction, and expansion / contraction means for expanding / contracting an outer peripheral surface S by moving the belt segments 2 in a radial direction. 3 and so on. And
The raw belt B is formed into a cylindrical shape on the outer peripheral surface S in the expanded state, and the raw belt B is formed in the reduced diameter state.
Is removed.

Here, in the diameter-expanded state, a gap G is generated between the belt segments 2, 2 adjacent in the circumferential direction.
Strictly speaking, the contour of the outer peripheral surface S is formed in a substantially polygonal shape. However, by increasing the number 2N of the belt segments 2, the interval G is reduced and becomes closer to a perfect circle.
Uniformity improves. For this purpose, the number 2N is set to be larger than 24, for example, 36.

The belt segment 2 is a long piece extending in the direction of the rotation axis, and its outer surface 2S is linear in a cross section including the rotation axis J. Also this outer surface 2
S is formed in an arc shape having a curvature substantially equal to the radius of the outer peripheral surface S in the expanded state in a section perpendicular to the rotation axis J. The term “substantially equal” means that the radius of the outer peripheral surface S in the expanded state is adjusted according to the tire size, but this adjustment width is allowed.

Next, as shown in FIG. 1, the expanding / contracting means 3 attaches the rotating shaft 4 and the belt segment 2 on the outer surface in the radial direction and alternately arranges N first first members in the circumferential direction. ,
The second slide metal fittings 5L, 5R extend radially outward from the rotation shaft 4 at both ends of the belt segment 2, and the first and second slide metal fittings 5L, 5R are firstly moved radially in and out. First and second side plates 7L and 7R for guiding through the second guide means 6L and 6R;
A first and a second, which engage with the second slide fittings 5L, 5R via first and second inclined guide means 9L, 9R and advance and retreat the first and second slide fittings 5L, 5R in the radial direction. Operating fittings 10L, 10R. The first and second operating brackets 10L and 10R are integrally attached to a sliding cylinder 11 which is inserted outside the rotary shaft 4.

In other words, the expansion / contraction means 3 is provided as shown in FIG.
As shown in FIG. 4, the rotary shaft 4 and the sliding cylinder 11 are shared by first and second expansion / contraction means portions 12L and 12R, and each of the expansion / contraction means portions 12L and 12R is 2N, respectively.
Segment group 13L and the other segment group 13 alternately arranged in the circumferential direction of the belt segments 2
R is supported. For convenience, one segment group 1
N belt segments constituting 3L are referred to as a first belt segment 2L, and N belt segments constituting the other segment group 13R are referred to as a second belt segment 2R.
It may be called.

The first expanding / contracting means 12L includes
It is formed to include a first slide fitting 5L, a first side plate 7L, a first guide means 6L, a first inclined guide means 9L, and a first operation fitting 10L.

The first slide fitting 5L is connected to the first slide fitting 5L.
Is formed in a plate shape in which the belt segment 2L is mounted on the outer surface in the radial direction, and is arranged radially with a pitch angle α of 360 / N degrees (in this example, 20 degrees) around the rotation axis J.

The first side plate 7L has a substantially disk shape extending radially outward from the rotation shaft 4 at one end side (the left end side in FIGS. 1 and 3) of the belt segment 2.
Is fixed so as to be integrally rotatable. Reference numeral 14 denotes a key for preventing rotation, and reference numeral 15 denotes a fixing ring which is retained by the rotating shaft 4 and fixes the first side plate 7L by bolts. This first side plate 7L is connected to one end (FIGS. 1, 3) of the first slide fitting 5L via first guide means 6L.
The left end is guided inward and outward in the radial direction.

In the present embodiment, the first guide means 6L is a linear guide. The first guide means 6L is linearly extended. The first guide means 6L is relatively moved along the rail section 16 by engaging with the rail section 16. And a bearing 17 in the form of a block. In the present example, the rail portion 16 is
The case where the bearing 17 is disposed on the inward surface of the first side plate 7L while being disposed at a right angle to the one end of the first slide fitting 5L.

The first slide fitting 5L has a slanted portion 21 on the inner side in the radial direction, which is inclined outward from the radial direction, and the sliding cylinder 11 has a first inclined guide on the inclined portion 21. The first operation fitting 10L having the oblique portion 22 engaged via the means 9L is integrally fixed. The first operation fitting 10L has a triangular blade shape, and is arranged in a straight line with the first slide fitting 5L as schematically shown in FIG.

The sliding cylinder 11 is supported so as to be able to advance and retreat in the direction of the rotation axis J by being externally inserted into the rotation shaft 4, and to be rotatable integrally with the rotation shaft 4 by the key 14. The other end of the sliding cylinder 11 (the right end in FIGS. 1 and 3)
In this example, a rod 19A of an advance / retreat tool 19 such as an air cylinder extending in the direction of the rotation axis J is connected to
By the movement of the rod 19A, the first operating fitting 10L
Can move forward and backward together with the sliding cylinder 11.

Here, the first inclined guide means 9L
Is formed by a linear guide including a rail portion 16 and a bearing portion 17, similarly to the guide means 6L. In the same drawing, the case where the bearing portion 17 is arranged on the radially inner edge of the first slide metal fitting 5L and the rail portion 16 is arranged on the radially outer edge of the first working metal fitting 10L is illustrated. I have. Therefore, in this example, the bearing surface 17 of the bearing portion 17 is used.
A forms the inclined portion 21 and the rail portion 16 forms the inclined portion 22.

As described above, the first slide fitting 5L is
Guided in the radial direction by the first guide means 6L, and since the inclined portion 21 and the inclined portion 22 are engaged with each other, in the direction of the rotational axis J of the first operating bracket 10L interposed in a wedge shape. The first slide fitting 5L can move forward and backward in the radial direction. In addition, in order to smoothly advance and retreat in the radial direction, the angle β of the inclined portion 21 with respect to the rotation axis J is preferably set to 25 ° to 45 °. More preferably, it is 35 ° to 40 °.

Next, the second expanding / contracting means 12R has substantially the same configuration as the first expanding / contracting means 12L, and includes a second slide fitting 5R, a second side plate 7R and a second 6R, a second inclined guide means 9R, and a second operation fitting 10R.

The second slide fitting 5R is connected to the second slide fitting 5R.
Has a pitch angle α, and is radially shifted from the first belt segment 2L in the circumferential direction by substantially a half pitch (approximately α / 2) with respect to the first belt segment 2L. Be placed.

The second side plate 7R is fixed to the rotating shaft 4 at the other end (right end in FIGS. 1 and 3) of the belt segment 2 so as to be integrally rotatable. Reference numeral 23 in the figure denotes a fixing ring for fixing the second side plate 7R by bolts.
The R and the fixing ring 23 are provided with holes for inserting the rod 19A.

The first side plate 7R is provided with a second guiding means 6R.
Through one end of the second slide fitting 5R (FIG. 1,
3 is guided inward and outward in the radial direction. A similar linear guide is used as the second guide means 6R,
The rail portion 16 is provided on the one end of the second slide fitting 5R, and the bearing portion 17 is provided on the inward surface of the second side plate 7R.

The second slide fitting 5R has a slanted portion 25 on the inner side in the radial direction, which is inclined outward from the radial direction, and the sliding cylinder 11 has a second inclined guide 25 on the inclined portion 25. The second operation fitting 10R having the oblique portion 26 engaged via the means 9R is integrally fixed. The second operating fitting 10R has a substantially triangular blade shape similar to the first operating fitting 10L, and is arranged in a straight line with the second slide fitting 5R.

As the second inclined guide means 9R,
A similar linear guide is used, and in this example, the bearing portion 17 is disposed on the radially inner edge of the second slide fitting 5R, and the rail portion 16 is disposed on the radially outer edge of the second actuation bracket 10R. Is done. Accordingly, the inclined portion 25 and the rail portion 16 are supported by the receiving surface 17A of the bearing portion 17.
This forms the diagonal portion 26.

The inclined portion 25 and the inclined portion 21 have the same inclination direction and the same inclination angle, and the first and second operating brackets 10L and 10R are moved forward and backward by the sliding cylinder 11. First and second slide fittings 5L, 5L
R moves forward and backward in the radial direction at the same time and the same distance.

In addition, in the expansion / contraction means 3 of the present invention, as shown in FIG. 1, the inclined portion 21 of the first slide member 5L and the inclined portion 25 of the second slide member 5R are connected to the rotation axis J. In addition to the displacement in the direction, the oblique portion 22 of the first operating fitting 10L and the oblique portion 26 of the second operating fitting 10R are displaced in the rotational axis direction.

Therefore, the first and second positions are caused by this displacement.
Abutment associated with the operation of the inclination guide means 9L, 9R, for example, the bearing portions 17, 1 adjacent in the circumferential direction and the rotational axis direction.
Abutment or bearing part 17 and slide bracket 5
It is possible to avoid collision with L and 5R.

In the expansion / contraction means 3, the first and second guide means 6L and 6R are separately disposed on one end side and the other end side of the belt segment 2, respectively. Abutment associated with the operation of the means 6L, 6R, for example, the bearing 1
The collision between the members 7 and 17 or the collision between the bearing 17 and the slide fittings 5L and 5R can be similarly avoided.

As a result, the number 2N of the belt segments 2
Is reduced, and the number can be greatly increased to more than 24, for example, about 36.

In this embodiment, in order to make the belt forming apparatus 1 compact, the first side plate 7L has a concave portion for accommodating the first working metal fitting 10R at the time of diameter enlargement at a radially inner portion thereof. 29 are formed.

The first and second guide means 6L, 6R,
In the first and second inclined guide means, the rail portion 16 is provided.
And the bearing 17 can be mounted in reverse. Also, the inclined portions 21 and 25 may be formed by radial inner end surfaces of the slide fittings 5L and 5R themselves, and the oblique portions 22 and 26 may be formed by radial outer end surfaces of the operation fittings 10L and 10R themselves. In such a case, a linear guide in which each end surface is a bearing surface is configured.

Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the illustrated embodiment, but may be implemented in various forms.

[0040]

Since the present invention is configured as described above,
The belt segment has the excellent advantage that the operation of the slide bracket is smooth and high-precision, and the outer peripheral surface can be maintained in a perfect circular shape without displacement even during high-speed rotation. Can be greatly increased, for example, to about 36. Therefore, the roundness of the outer peripheral surface (when the diameter is increased) can be further improved, and this can greatly contribute to the improvement of the tire uniformity.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view including a rotation axis according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II of FIG. 1;

FIG. 3 is an exploded sectional view showing the expansion / contraction means into first and second expansion / contraction means portions.

FIG. 4 is a diagram showing an arrangement of belt segments in FIG. 3;

FIG. 5 is a cross-sectional view of a conventional belt forming apparatus in a direction perpendicular to a rotation axis.

FIG. 6 is a cross-sectional view including a rotation axis showing a conventional belt forming apparatus;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Belt forming apparatus 2 Belt segment 3 Expansion / contraction means 4 Rotating shaft 5L, 5R First and second slide fittings 6L, 6R First and second guide means 7L, 7R First and second side plates 9L, 9R 1, second inclined guide means 10L, 10R first and second operating brackets 19A rods 21, 25 inclined portions 22, 26 inclined portions B raw belt S outer peripheral surface

Claims (4)

[Claims] An outer peripheral surface is enlarged and reduced in diameter by being divided in a circumferential direction and moved in a radial direction by expansion and contraction means, and a raw belt of a tire can be formed by expanding the diameter and the raw belt is removed by reducing the diameter. A belt forming device having a long number of 2N long-strip belt segments, wherein the expansion / contraction means comprises: a rotating shaft; and the belt segments mounted on a radially outer surface and arranged alternately in a circumferential direction and in a radial direction. N first and second slide fittings each having a radially inwardly inclined portion inclined from inside to outside; first and second side plates extending radially outward from the rotation shaft at both ends of the belt segment; And the first side plate guides one end of the first slide fitting in and out of the radial direction via first guide means, and the second side plate radially connects one end of the second slide piece to the other end. The rotary shaft center is guided inward and outward through second guide means, and is engaged with the inclined portions of the first and second slide fittings via first and second inclined guide means, respectively. A first portion having an oblique portion for moving the first and second slide fittings in the radial direction by retreating in the direction;
By disposing a second operating bracket, and displacing each inclined portion of the first and second slide brackets and the oblique portion of the first and second operating brackets in the direction of the rotation axis, the second operating bracket is displaced. A belt forming apparatus, wherein an abutment associated with the operation of the first and second guide means and an abutment associated with the operation of the first and second inclined guide means are prevented. 2. The belt forming apparatus according to claim 1, wherein the first and second operating brackets move forward and backward by movement of a rod extending in the direction of the rotation axis. 3. The belt forming apparatus according to claim 1, wherein both the first and second guide means and the first and second inclined guide means use linear guides. 4. The inclined portion has an angle of 25.degree.
The belt forming apparatus according to any one of claims 1 to 3, wherein the belt forming apparatus is inclined at an angle of 45 °.