JP2002028986A - Drum for molding tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire molding drum the diameter of which is variable and which can control the generation of grooves in a tire component member when the member is wound onto the drum and the generation of air banks between layers when the member is wound/laminated to form the layers. SOLUTION: Segments 16A and 16B having arc-shaped drum periphery forming parts 28 for winding the tire component member are arranged to be able to rotate around a shaft cylinder while being integrated with the cylinder. By moving the segments 16A and 16B across the axis of the shaft cylinder, the diameter of the drum is adjusted. The drum periphery forming parts 28 of the segment 16A and 16B are formed so that the clearance between the adjacent segments 16A and 16B does continue in the axial direction on the periphery of the drum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for forming a green case in a band formed by bonding tire components such as an inner liner, a chaher, and a ply, and a first molding in a manufacturing process of a passenger tire. The present invention relates to a tire building drum.

[0002]

2. Description of the Related Art In general, in a tire forming drum used for forming a band or a green case, in order to cope with a variation in the diameter of a tire component to be wound around its outer periphery, or to adjust a tire rim diameter. In order to quickly respond to the change, a drum diameter changeable is required. In order to cope with such a demand, for example, a tire building drum having a configuration as shown in FIG. 7 has been conventionally proposed.

In this conventional configuration, a plurality of main segments 42 are provided on the outer periphery of a shaft cylinder 41 at predetermined angular intervals.
The drum outer peripheral forming portion 42a is formed so as to be integrally rotatable and relatively movable in a radial direction intersecting with the axis of the barrel 41, and is formed on the outer periphery thereof so as to extend along the axial direction of the barrel 41. Have been. A plurality of sub-segments 43 are arranged on the outer periphery of the barrel 41 at predetermined angular intervals so as to be located between the main segments 42 so as to be integrally rotatable and relatively movable in a radial direction intersecting with the axis of the barrel 41. And an outer periphery thereof is formed on the outer periphery thereof.
a is formed so as to extend along the axial direction of the shaft cylinder 41.

Then, each main segment 42 and each sub-segment 43 are connected to the barrel 41 by a drum diameter changing mechanism.
Are integrally moved in a radial direction intersecting the axis of the drum to change the drum diameter. Further, in this setting of the drum diameter, after the winding start end of the tire component member 45 is suction-fixed to the outer periphery of the drum by the suction airflow from the suction passages 44 provided in some of the main segments 42, the tire configuration is changed. The member 45 is wound around the outer periphery of the drum.

[0005]

However, in this conventional tire building drum, the adjacent main segment 4
2 and the sub-segment 43, a concave groove 46 extending continuously in the axial direction is formed between the edges of the drum outer peripheral forming portions 42a, 43a. The width of 46 increases. For this reason, when the tire constituent member 45 is wound around the outer periphery of the drum, there is a problem that a streak-like dent is formed in a portion corresponding to the concave groove 46 of the tire constituent member 45. When a plurality of tire constituent members 45 are laminated and wound around the outer periphery of the drum, the groove 4
There is also a problem that air pockets are likely to be generated between the layers corresponding to the portion 6.

In order to cope with such a problem, for example, the entire outer periphery of the drum is covered with a cylindrical rubber sheet.
A configuration in which the concave groove 46 is apparently excluded has also been proposed. However, in this configuration, since the suction passage 44 is closed by the rubber sheet, a new problem arises in that it becomes difficult to fix the winding start end of the tire component 45 by suction.

The present invention has been made by paying attention to such problems existing in the prior art. The purpose is to form a streak-like depression in the tire component when the tire component is wound around the outer periphery of the drum, or to generate air pockets between the layers when a plurality of tire components are stacked and wound. An object of the present invention is to provide a tire building drum capable of changing the diameter of the drum, which is capable of suppressing the friction.

[0008]

Means for Solving the Problems and Effects of the Invention In order to achieve the above object, according to the first aspect of the present invention, a plurality of tires having an arc-shaped drum outer peripheral forming portion for winding a tire component member are provided. The tire molding is arranged such that the drum diameter is adjusted by disposing the segments around the barrel so as to be integrally rotatable therewith and moving each segment in a direction intersecting the axis of the barrel. The drum outer peripheral forming portion of each segment is formed so that a gap between adjacent segments is not continuous in the axial direction around the drum outer periphery.

Therefore, according to the first aspect of the present invention, the diameter of the drum can be changed and adjusted by moving the plurality of segments in a direction intersecting the axis of the barrel. In this case, the gap between adjacent segments does not extend continuously in the axial direction around the drum. Therefore, when the tire constituent member is wound around the outer periphery of the drum, a streak-like depression is generated in the tire constituent member, or when a plurality of tire constituent members are stacked and wound, air pockets are generated between the respective layers. Can be suppressed.

According to a second aspect of the present invention, in the first aspect of the present invention, the drum outer peripheral forming portion of each segment alternately interposes a space slightly wider than the width of the drum outer peripheral forming portion. And a plurality of drums are formed in the axial direction of the outer periphery of the drum.

Therefore, according to the second aspect of the present invention, it is possible to use a segment having a simple structure so that the gap between adjacent segments is not continuously formed in the axial direction on the outer periphery of the drum. .

According to a third aspect of the present invention, in the second aspect of the invention, the drum outer peripheral forming portions of the respective segments are nested in a space between the drum outer peripheral forming portions of the adjacent segments. It is characterized by having made it.

Therefore, according to the third aspect of the present invention, the structure of the segments is simple, and adjacent segments can be easily assembled.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1 and FIG. 2, the tire building drum 11 of this embodiment includes:
The shaft cylinder 12 includes a pair of disk-shaped disks 13 fixed to both ends of the barrel 12, and a cylindrical connecting shaft 14 fixed to one end of the barrel 12. A tapered portion 15 is provided at the tip of the connecting shaft 14, and the tapered portion 15 is fitted into a tapered hole formed in a main shaft of a tire forming device (not shown) so that the tire forming drum 11 can be attached to and detached from the main shaft. It is designed to be attached to.

As shown in FIGS. 1 to 3, a plurality of segments 16 can be integrally rotated at predetermined angular intervals between the two disks 13 via a pair of guide members 17 and a bracket 18, respectively. Are supported so as to be relatively movable in a radial direction intersecting with the axis of. A cylindrical drum diameter changing member 19 is fitted and supported on the outer periphery of the shaft cylinder 12 so as to be relatively movable in the axial direction, and an inclined portion is provided between the tapered projections 19a on the outer periphery of both ends and the brackets 18 on both ends of the segment 16. The cam member 20 is interposed in a state inclined at a predetermined angle with respect to the axial direction.

An adjusting shaft 21 is rotatably inserted and supported in the connecting shaft 14. A ball screw 22 is rotatably supported in the barrel 12 and is connected to the inner end of the adjustment shaft 21. A nut 23 is screwed into the ball screw 22 and is connected to the drum diameter changing member 19 via a connecting plate 24. When the ball screw 22 is rotated by the adjustment shaft 21, the drum diameter changing member 19 is moved in the axial direction via the nut 23. Thus, the cam action of the inclined cam member 20 moves each segment 16 in the radial direction intersecting with the axis of the barrel 12, thereby changing and adjusting the diameter of the tire forming drum 11.

As shown in FIGS. 1, 4 and 5, two types of segments 16 are provided, a first segment 16A and a second segment 16B. Are arranged alternately along. Each of the segments 16A and 16B includes a substrate portion 27 extending along the axial direction, and a plurality of arc-shaped drum outer peripheral forming portions 28 formed on the outer surface of the substrate portion 27 at predetermined intervals in the longitudinal direction. . And between the drum outer peripheral forming portions 28, the drum outer peripheral forming portions 28
A space 29 slightly wider than the width of the space 29 is formed.

The first segment 16A and the second segment 16B are formed so that the positions of the drum outer peripheral forming portion 28 and the space 29 are alternated. That is, the drum outer peripheral forming portion 28 and the space 29 of the first segment 16A are connected to the space 29 of the second segment 16B.
And the drum outer peripheral forming portion 28. Then, with the segments 16A, 16B assembled, the drum outer peripheral forming portion 28 of each segment 16A, 16B is nested in the space 29 between the drum outer peripheral forming portions 28 of the adjacent segments 16B, 16A. It has become. And each segment 16
The tire constituent member 31 is wound around the drum outer peripheral forming portions 28 of A and 16B.

With this configuration, as shown in FIGS. 5 and 6, the gap between the adjacent segments 16A and 16B is not continuously formed in the axial direction on the outer periphery of the drum. That is, adjacent dissimilar segments 16
Between A and 16B, since the drum outer peripheral forming portions 28 are alternately arranged in a nested state, no gap is formed between the opposed ends of the drum outer peripheral forming portions 28. A gap 30 is formed between opposing ends of the drum outer peripheral forming portion 28 between adjacent segments 16A-16A, 16B-16B of the same type via different types of segments 16B, 16A. However, these gaps 30 are formed by different types of segments 16B, 16A in the axial direction of the outer periphery of the drum.
Are formed alternately with the drum outer peripheral forming portions 28 interposed therebetween, and therefore do not extend continuously in the axial direction on the drum outer periphery.

Next, the operation of the tire forming drum 11 configured as described above will be described. When the ball screw 22 is rotated by the adjusting shaft 21 with the tire forming drum 11 mounted on the main shaft of a tire forming device (not shown), the drum diameter changing member 19 is moved along the axial direction through the nut 23. Moved right or left. Thus, the cam action of the inclined cam member 20 causes each segment 16
A and 16B are moved in the radial direction intersecting with the axis of the barrel 12, and the diameter of the tire forming drum 11 is changed and adjusted. That is, as shown in the lower part of the center in FIG. 2, when the drum diameter changing member 19 is moved to the right, the segments 16A and 16B are moved inward in the radial direction to reduce the drum diameter. In this case, FIG.
As shown in FIG. 3, the same type of adjacent segments 16A-16A, 16B-
The gap 30 between 16B becomes narrow.

On the other hand, as shown above the center in FIG. 2, when the drum diameter changing member 19 is moved to the left, each segment 16 is moved radially outward to expand the drum diameter. . In this case, as shown in FIG. 6, the gap 30 between adjacent segments 16A-16A, 16B-16B of the same type via the different segments 16B, 16A is widened. However, these gaps 30
Instead of being continuous in the axial direction on the outer periphery of the drum, they are formed alternately with the outer periphery forming portions 28 of different types of segments 16B and 16A interposed.

For this reason, in the state where the diameter of the drum is adjusted, as shown by a chain line in FIG. There is no fear that a streak-like depression extending in the circumferential direction is generated in the component member 31. In addition, when a plurality of the tire constituent members 31 are wound around the outer circumference of the tire forming drum 11, there is no possibility that air is trapped between the respective layers.

Therefore, according to this embodiment, the following effects can be obtained. (1) In the tire building drum 11, a plurality of segments 16 A and 16 B having an arc-shaped drum outer peripheral forming portion 28 for winding the tire constituent member 31 are formed around the shaft cylinder 12. It is arranged so as to be able to rotate integrally with it. The diameter of the drum is adjusted by moving each of the segments 16A and 16B in a direction intersecting the axis of the barrel 12. The drum outer periphery forming portion 28 of each segment 16A, 16B is formed such that the gap between the adjacent segments 16A, 16B is not continuous in the axial direction on the drum outer periphery.

For this reason, a plurality of segments 16A, 16
By moving B in the direction intersecting with the axis of the barrel 12, the diameter of the drum can be easily changed and adjusted.
In this case, the gap between the adjacent segments 16A and 16B does not extend continuously in the axial direction around the drum. Therefore, when the tire component 31 is wound around the outer periphery of the tire forming drum 11, the tire component 3
1 can suppress the formation of streak-like depressions and the occurrence of air pockets between the layers when a plurality of tire constituent members 31 are stacked and wound.

(2) In the tire forming drum 11, the drum outer peripheral forming portions 28 of the respective segments 16A and 16B alternately interpose spaces 29 slightly wider than the width of the drum outer peripheral forming portions 28. Are formed in the axial direction of the outer periphery of the drum. For this reason, by the segments 16A and 16B having a simple structure, the gap between the adjacent segments 16A and 16B can be configured so as not to be continuously extended in the axial direction around the drum.

(3) In the tire forming drum 11, the drum outer peripheral forming portions 28 of the segments 16A, 16B are nested in the space 29 between the drum outer peripheral forming portions 28 of the adjacent segments 16B, 16A. It is supposed to be. Therefore, the segments 16A, 1
6B has a simple structure, and the adjacent segments 16A and 16B can be easily assembled.

(Modification) This embodiment can be modified and embodied as follows. -The size, shape, number of arrangement, and the like of the drum outer peripheral forming portion 28 of each of the segments 16A and 16B in the above embodiment may be arbitrarily changed.

In the above embodiment, the segment 16
The mechanism for moving A and 16B in the radial direction may be appropriately changed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a tire building drum according to an embodiment.

FIG. 2 is a cross-sectional view showing the tire building drum of FIG. 1 in an enlarged state on the upper side from the center and in a reduced state on the lower side.

FIG. 3 is an exploded perspective view of a main part of the tire building drum of FIG. 1;

FIG. 4 is an exploded perspective view showing an enlarged segment of the tire building drum.

FIG. 5 is a perspective view showing the segments of FIG.

FIG. 6 is a perspective view showing the segments of FIG. 5 in an expanded state.

FIG. 7 is a partial sectional view showing a conventional tire building drum.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 ... Drum for tire building, 12 ... Shaft cylinder, 16 ... Segment, 16A ... 1st segment, 16B ... 2nd segment, 27 ... Substrate part, 28 ... Drum periphery forming part, 29 ... Space, 30 ... Gap, 31 ... Tire components.

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[Procedure amendment]

[Submission date] October 6, 2000 (2000.10.
6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

[0002]

2. Description of the Related Art In general, in a tire forming drum used for forming a band or a green case, in order to cope with a variation in the diameter of a tire component to be wound around its outer periphery, or to adjust a tire rim diameter. to quickly respond to changes, capable change of the drum diameter is required <br/>. In order to cope with such a demand, for example, a tire building drum having a configuration as shown in FIG. 7 has been conventionally proposed.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction contents]

The first segment 16A and the second segment 16B are formed so that the positions of the drum outer peripheral forming portion 28 and the space 29 are alternated. That is, the drum outer peripheral forming portion 28 and the space 29 of the first segment 16A are connected to the space 29 of the second segment 16B.
And, respectively Re drum periphery forming portion 28 Niso adapted corresponding. Then, with the segments 16A, 16B assembled, the drum outer peripheral forming portion 28 of each segment 16A, 16B is nested in the space 29 between the drum outer peripheral forming portions 28 of the adjacent segments 16B, 16A. It has become. And each segment 16
The tire constituent member 31 is wound around the drum outer peripheral forming portions 28 of A and 16B.

Claims (3)

[Claims] 1. A plurality of segments each having an arc-shaped drum outer periphery forming portion for winding a tire constituent member are disposed around a shaft cylinder so as to be integrally rotatable therewith, and each segment is formed by a shaft cylinder. In the tire building drum in which the drum diameter is adjusted by moving in a direction intersecting with the axis of A tire forming drum formed so as not to be continuous with the tire. 2. The drum outer peripheral forming portion of each segment is formed in a plurality in the axial direction of the drum outer peripheral while alternately interposing spaces slightly wider than the width of the drum outer peripheral forming portion. Item 2. A tire forming drum according to Item 1. 3. The tire molding apparatus according to claim 2, wherein the drum outer peripheral forming portion of each segment is nested in a space between the drum outer peripheral forming portions of adjacent segments. drum.