JP2015039821A - Tire molding drum device, and drum width adjusting method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire molding drum device which reduces time and labors for adjusting drum width, and a drum width adjusting method using the same.SOLUTION: A tire molding drum device 1 is equipped with a center drum 2 having a drum outer peripheral surface 2S, side drums 3 on both sides of the center drum 2, and a center shaft 4 for supporting the center drum 2 and the side drums 3. The center drum 2 includes a plurality of segments 7, and a segment moving tool 8 for moving each segment 7. Each segment 7 is formed by a center segment piece 9 replaceably attached to the segment moving tool 8 at an equator position C, and side segment pieces 10 arranged on both side in an axial direction of the center segment piece 9 so as to come close to and separate from each other. The side segment pieces 10 are coupled to the side drums 3 so as to be integrally moved. Side drum moving means 12 capable of positioning each side drum 3 at a close state P1 and an open state P2 is provided.

Description

  The present invention relates to a tire molding drum device that includes a central drum that can be expanded and contracted and that can adjust the drum width of the central drum.

  Conventionally, as shown in FIG. 6, a central drum b having a cylindrical drum outer peripheral surface b1, a pair of side drums c arranged on both outer sides in the axial direction of the central drum b, the central drum b, A tire forming drum device (hereinafter sometimes simply referred to as “drum device”) a having a central axis d that rotatably supports a side drum c has been proposed (for example, Patent Document 1 below) reference).

  The central drum b is composed of a pair of drum portions b2 and b2 that are arranged so as to be movable toward and away from each other in the axial direction of the central axis d. The drum portion b2 is composed of a plurality of segments divided in the circumferential direction, and is configured to be able to be expanded and contracted into a reduced diameter state and an expanded diameter state by means of an expanded / reduced diameter means (not shown) using a cylinder or the like. Yes. Then, after the tire member e including the carcass ply is wound in a cylindrical shape on the drum outer peripheral surface b1 in the expanded diameter state, the formed cylindrical tire member e is removed from the central drum b in the reduced diameter state. It is.

JP 2013-6391 A

  In the drum device a, the drum width of the central drum b is changed when the tire size is changed by adjusting the gap f between the drum portions b2 and b2. However, in such a drum device a, there is a problem that a recess is formed in the central portion in the axial direction of the formed cylindrical tire member e due to the gap f, and the quality of the tire is impaired. . Therefore, it is desirable to arrange a central segment piece that smoothly connects the segments on both sides in the gap f. However, for this purpose, a new drum structure is required which facilitates the replacement work of the central segment piece and the adjustment work of the drum width according to the tire size.

  The present invention has been made in view of the above circumstances, and provides a tire forming drum device capable of easily adjusting the drum width without generating a gap between the drum portions, and a drum width adjusting method using the same. This is the main purpose.

  The present invention includes a central drum capable of expanding and contracting having a drum outer periphery on which a tire member including a carcass ply is wound in a cylindrical shape, a pair of side drums supported so as to be axially movable on both sides of the central drum, and A tire forming drum device having a rotatable central shaft that concentrically supports the central drum and the side drum, wherein the central drum is disposed circumferentially around the central shaft and cooperates with each other. A plurality of segments constituting an outer peripheral surface of the drum, and a segment moving tool supported by the central axis and moving each of the segments inward and outward in the radial direction, and each of the segments moves at the equator position of the central drum. The central segment piece that can be exchanged with the central segment piece, and arranged on both sides in the axial direction, and supported by the segment moving tool so as to be slidable in the axial direction. The side segment piece is formed from a side segment piece that is separable from the central segment piece, and an axially outer end portion of the side segment piece is formed on an inner side portion of the side drum in an axial direction with respect to the side drum. The side drums are connected so as to be integrally movable, and the side drums are moved inward and outward in the axial direction around the equator position, thereby separating from the closed state in which the inner end of the side segment piece is in contact with the outer end of the central segment piece. Side drum moving means that can change the position between the open state is provided.

  In the tire forming drum device according to the present invention, the side drum moving means includes a ball screw shaft having a thread portion extending in the axial direction and having different orientations on one side and the other side in the axial direction of the equator position. It is desirable to include a ball nut provided on the side drum and screwed onto the ball screw shaft.

  In the tire forming drum device according to the present invention, the side drum moving means is formed on each side drum and a guide shaft extending in parallel with the ball screw shaft at a symmetrical position of the ball screw shaft with respect to a central axis. And a bearing hole through which the guide shaft is slidably inserted.

  In the tire molding drum device according to the present invention, the side drum moving means is disposed on the outer side in the axial direction of one of the side drums, and locks the side drum by preventing the rotation of the ball screw shaft. It is desirable to include a mechanism.

  In the tire molding drum device according to the present invention, an adsorbent body made of a magnet is arranged on one of the segment moving tool or the central segment piece, and the other is formed of a magnetic body adsorbed on the adsorbent body. desirable.

  In the tire forming drum device according to the present invention, the inner end of the side segment piece and the outer end of the central segment piece are formed with an uneven shape in the axial direction and are engaged with each other in the closed state. Is desirable.

  The present invention is a drum width adjusting method using the tire forming drum device according to any one of claims 1 to 6, wherein the side segment piece is pivoted from the closed state to the open state by the side drum moving means. A drum opening step for moving outward in the direction, an exchanging step for removing the central segment piece from the segment moving tool in the open state and replacing it with a central segment piece of another size having a different axial width, and the side drum moving means. And a drum closing step in which the opened side segment piece is moved inward in the axial direction to be closed.

  In the tire forming drum apparatus of the present invention, the side drums on both sides are supported by the side drum moving means so as to be movable in the axial direction with the equator position as the center. The central drum is formed by a plurality of segments supported so as to be movable in the radial direction by a segment moving tool, and each segment is divided into a central segment piece and side segment pieces on both axial sides thereof. .

  Among these, the side segment piece is supported by the segment moving tool so as to be slidable in the axial direction, and the axial outer end portion of the side segment piece is connected to the side drum so as to be integrally movable in the axial direction. Yes. That is, the side segment piece can be enlarged or reduced in diameter by the segment moving tool, and can be moved integrally with the side drum in and out of the axial direction around the equator position by the side drum moving means. On the other hand, the central segment piece is exchangeably attached to the segment moving tool at the equator position.

  Therefore, the side segment piece can be separated from the central segment piece by the movement of each side drum outward in the axial direction. In this separated state (opened state), the central segment piece can be easily replaced by being detached from the segment moving tool. That is, the drum width can be adjusted easily and accurately.

  Further, the side segment piece and the central segment piece can be brought into contact with each other by movement of each side drum inward in the axial direction. In this contact state (closed state), the drum outer peripheral surface without a gap is formed so as to be able to expand and contract, so that the tire can be formed with high quality.

It is a side view of the tire molding drum device of one embodiment of the present invention. It is sectional drawing of the tire shaping | molding drum apparatus containing the axial center of a center axis | shaft. FIG. 3 is a cross-sectional view of the central drum in FIG. 2 near the equator position. It is sectional drawing of the outer end part vicinity of the side segment piece of FIG. FIG. 3 is a partial enlarged view of one side of the equator position in FIG. 2. It is a schematic side view of the conventional tire forming drum apparatus.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a side view of a tire molding drum device 1 (hereinafter sometimes simply referred to as “drum device”) 1 of the present embodiment. In the drum device 1 of the present embodiment, the tire member T including the tire carcass ply is wound in a cylindrical shape on the drum outer peripheral surface 2S, thereby forming a part of the raw tire.

  As shown in FIG. 1, the drum device 1 includes a central drum 2 having a drum outer peripheral surface 2 </ b> S and an expandable / contractible diameter, a pair of side drums 3 and 3 supported on both sides of the central drum 2, and the central drum 2 and the side. A central shaft 4 that supports the drum 3 concentrically is provided.

  One end 4a of the central shaft 4 is connected to known driving means (not shown) such as a motor and is rotatably supported.

  FIG. 2 shows a cross-sectional view including the axis of the central shaft 4 of the drum device 1 of FIG. As shown in FIG. 1 or FIG. 2, the central drum 2 includes a plurality of segments 7 arranged in the circumferential direction around the central shaft 4 and a segment moving tool 8 supported by the central shaft 4. .

  FIG. 3 shows a circumferential sectional view of the central drum 2 in FIG. 2 near the equator position C. As shown in FIGS. 1 to 3, the segment transfer tool 8 moves each segment 7 radially in and out. As a result, the central drum 2 has a diameter-reduced state Y2 (shown below the center line in FIG. 3) in which the segment 7 is radially inward, and a diameter-increased state Y2 (center line in FIG. 3) that is radially outward. It can be enlarged or reduced in diameter. Further, the tire member T is wound in the expanded diameter state Y2, and the cylindrical tire member T wound in the reduced diameter state Y1 is removed.

  The segment transfer tool 8 of the present embodiment includes, for example, a plurality of cylinders 8 a fixed to the central shaft 4, and a moving piece 8 b that links each cylinder 8 a and each segment 7. The moving piece 8b has a plate shape extending inward and outward in the radial direction, and both outer end portions in the axial direction are guided inward and outward in the radial direction via the guide means 30. As shown in FIG. 5, the guide means 30 includes, for example, a disk-shaped side wall 30 </ b> A fixed to the central shaft 4, and a guide groove provided on the inner side surface for guiding the outer end portion of the moving piece 8 b. And a guide portion 30B. As the segment transfer tool 8, for example, a well-known link mechanism or a bladder can be used instead of the cylinder 8a.

  The segments 7 cooperate with each other to form the drum outer peripheral surface 2S. Each segment 7 includes a central segment piece 9 that is exchangeably attached to the moving piece 8b of the segment moving tool 8 at the equator position C of the central drum 2, and side segment pieces 10 disposed on both sides in the axial direction of the central segment piece 9. Is formed.

  The side segment piece 10 is supported by the moving piece 8b of the segment moving tool 8 so as to be slidable in the axial direction. For this reason, the side segment piece 10 can be separated from the central segment piece 9 in the axial direction.

  The side drum 3 includes a cylindrical base body 3a that is supported so as to be movable in the axial direction of the central shaft 4, and a turn-up bladder 3b that is folded and held on the outer peripheral surface of the base body 3a. As is well known, the turn-up bladder 3b is inflated by filling with an internal pressure, and turns back both ends of the carcass ply of the tire member T.

  FIG. 4 shows a cross-sectional view of the vicinity of the outer end portion 10a of the side segment piece 10 of FIG. As shown in FIGS. 2 to 4, the side segment piece 10 is coupled to the side drum 3 via a coupling means 32 so as to be integrally movable in the axial direction. More specifically, the connecting means 32 is attached to the first side plate portion 32A attached to the inner portion 3c of the side drum 3 and the outer end portion 10a of the side segment piece 10 and is attached to the first side plate portion 32A. The second side plate portion 32B faces each other. One of the first and second side plate portions 32A and 32B is provided with, for example, a dovetail-shaped locking portion extending inward and outward in the radial direction, and the other is engaged with the locking portion and has a radius. For example, an ant tenon-like engaging portion that is guided in and out of the direction is arranged. The engaging portion and the engaging portion are connected so as to be movable inward and outward in the axial direction and relatively movable inward and outward in the radial direction. In addition, the thing of various structures can be employ | adopted as said latching | locking part and engaging part.

  FIG. 5 shows a partially enlarged view in which one side of the equator position C in FIG. 2 is enlarged. As shown in FIG. 2 or 5, the drum device 1 is provided with side drum moving means 12 that moves each side drum 3 in and out of the axial direction around the equator position C. Each side drum 3 is closed by the side drum moving means 12 so that the inner end 10b of the side segment piece 10 is in contact with the outer end 9a of the central segment piece 9 (shown above the center line in FIG. 5). The position can be changed between the separated open state P2 (shown below the center line in FIG. 5).

  The side drum moving means 12 of the present embodiment includes, for example, a ball screw shaft 13 extending in the axial direction and penetrating each side drum 3, and a ball nut 14 provided on each side drum 3. The ball nut 14 is screwed onto the ball screw shaft 13.

  The ball screw shaft 13 has screw portions 13c having different directions on one side and the other side in the axial direction of the equator position C. One end 13 a of the ball screw shaft 13 is pivotally supported by a bearing 15 disposed on the central shaft 4 on the outer side in the axial direction of one side drum 3. On the contrary, the other end portion 13b is formed with a connecting portion 13b1 that can be connected to a driving means such as an electric motor that rotates the ball screw shaft 13. Further, the ball screw shaft 13 passes through each side drum 3, and at this time passes between the segment moving tools 8, 8 adjacent in the circumferential direction, so that when the diameter of the segment 7 is increased or decreased, the segment 7 And contact with the segment moving tool 8 is prevented.

  The side drum moving means 12 of the present embodiment includes, for example, a guide shaft 16 extending parallel to the ball screw shaft 13 at a symmetrical position of the ball screw shaft 13 around the central shaft 4, and a bearing formed on each side drum 3. Hole 17. The bearing hole 17 supports the guide shaft 16 so as to be slidable. According to the guide shaft 16 and the bearing hole 17 as described above, the movement of the side drum 3 in the axial direction by the ball screw shaft 13 can be performed more smoothly. As with the ball screw shaft 13, the guide shaft 16 extends through each side drum 3. At this time, the guide shaft 16 passes between the segment moving tools 8, 8 adjacent in the circumferential direction, thereby increasing the diameter of the segment 7. When the diameter is reduced, contact with the segment 7 and the segment moving tool 8 is prevented.

  The side drum moving means 12 preferably includes a lock mechanism 18 that fixes the movement of the side drum 3 in the axial direction by preventing the ball screw shaft 13 from rotating, for example. The lock mechanism 18 of the present embodiment is disposed on the outer side in the axial direction of one side drum 3. The lock mechanism 18 includes, for example, a holding portion 18a that holds one end portion 13a of the ball screw shaft 13 and has an axial slit, and a lever 18b that adjusts the slit width. The holding part 18a is fixed to the bearing 15, for example. In such a lock mechanism 18, the rotation of the holding portion 18a is narrowed by the lever 18b and the ball screw shaft 13 is tightened to prevent the rotation. As a result, the rotation of the ball screw shaft 13 during the molding of the tire can be prevented, and the position shift of the side drum 3 can be prevented.

  In the drum device 1 of the present embodiment, an engagement portion 20 is formed at the inner end 10b of the side segment piece 10 and the outer end 9a of the central segment piece 9 so as to mesh with each other in the closed state P1. The engaging portions 20 are uneven in the axial direction, and in this embodiment, the inner end 10b of the side segment piece 10 is radially outward and convex inward in the axial direction.

  In the drum device 1 of the present example, for example, an adsorbent 21 made of a magnet is disposed on one of the moving piece 8b or the central segment piece 9 of the segment moving tool 8 (in the present embodiment, the central segment piece 9). The other (movable piece 8 in the present embodiment) is formed of a magnetic body that is attracted to the attracting body 21. According to such a configuration, the central segment piece 9 can be prevented from falling off in the open state P2.

  In the drum device 1 of the present embodiment, the central segment piece 9 can be detached from the segment moving tool 8 and exchanged in the open state P2 where the central segment piece 9 is separated from the side segment piece 10. That is, the drum width can be adjusted easily and accurately. In the closed state Y1 where the side segment piece 10 and the central segment piece 9 are in contact with each other, the drum outer peripheral surface 2S having no gap in the axial direction is formed. Therefore, it is possible to wind the tire member T on the drum outer peripheral surface 2S with high accuracy without causing deformation of the tire member T.

Hereinafter, a drum width adjusting method using the drum device 1 of the present embodiment will be described.
In the drum width adjusting method, the side drum moving means 12 moves the side segment piece 10 axially outward from the closed state P1 to the open state P2, and the central segment piece 9 is moved in the open state P2 by moving the segment. The side segment piece 10 in the open state P2 is moved inward in the axial direction by the replacement step of removing from the moving piece 8b of the tool 8 and replacing it with the central segment piece 9 of another size having a different axial width and the side drum moving means 12. And a drum closing step for setting the closed state P1. According to such a drum width adjustment method, it is possible to reduce time and labor required for drum width adjustment.

  In the drum opening process of the present embodiment, for example, the lever 18b of the lock mechanism 18 is operated, and the ball screw shaft 13 can be rotated. Next, an appropriate electric motor is connected to the other end portion 13c of the ball screw shaft 13, and the ball screw shaft 13 is rotated. As a result, the side drum 3 is moved from the closed state P1 to the open state P2, and each side segment piece 10 is also moved outward in the axial direction. At this time, the engagement between the outer end 9a of the central segment piece 9 and the inner end 10b of the side segment piece 10 is released, but the central segment piece 9 and the moving piece 8b of the segment moving tool 8 are adsorbed, The central segment piece 9 is prevented from falling off.

  In the drum closing process of the present embodiment, for example, an appropriate electric motor is connected to the other end portion 13c of the ball screw shaft 13, and the ball screw shaft 13 is rotated. As a result, the side drum 3 is moved from the open state P2 to the closed state P1, and each side segment piece 10 is also moved outward in the axial direction. At this time, the outer end 9a of the central segment piece 9 and the inner end 10b of the side segment piece 10 are engaged with each other, and when the tire member T is molded, the central segment piece 9 is prevented from falling off. After the side drum 3 is in the closed state P1, the lever 18b of the lock mechanism 18 is operated, and the rotation of the ball screw shaft 13 is locked.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to these embodiment, It can deform | transform and implement in a various aspect.

DESCRIPTION OF SYMBOLS 1 Tire shaping drum apparatus 2 Central drum 3 Side drum 4 Central axis 7 Segment 8 Segment moving tool 9 Central segment piece 10 Side segment piece 12 Side drum moving means C Equatorial position P1 Closed state P2 Open state

Claims (7)

A central drum capable of expanding and contracting, having a drum outer peripheral surface around which a tire member including a carcass ply is wound in a cylindrical shape;
A pair of side drums supported so as to be axially movable on both sides of the central drum;
And a tire forming drum device having a rotatable central shaft that concentrically supports the central drum and the side drum,
The central drum is arranged in the circumferential direction around the central axis and cooperates with each other to constitute the outer peripheral surface of the drum, and is supported by the central axis and moves the segments in and out in the radial direction. Including a segment moving tool,
Each said segment is
A central segment piece that is replaceably attached to the segment moving tool at the equator position of the central drum;
It is arranged on both sides in the axial direction, and is formed from side segment pieces that can be moved away from the central segment piece by being supported by the segment moving tool so as to be slidable in the axial direction.
An axially outer end portion of the side segment piece is connected to an inner side portion of the side drum so as to be integrally movable with the side drum in the axial direction.
Moreover, each side drum is moved inward and outward in the axial direction with the equator position as the center, thereby positioning between the closed state where the inner end of the side segment piece is in contact with the outer end of the central segment piece and the open state where the side segment piece is separated. A tire-forming drum device provided with replaceable side drum moving means.   The side drum moving means includes a ball screw shaft extending in the axial direction and having screw portions in different directions on one side and the other side in the axial direction of the equator position, and provided on each side drum and screwed onto the ball screw shaft. The tire forming drum device according to claim 1, further comprising a ball nut to be joined.   The side drum moving means includes a guide shaft extending parallel to the ball screw shaft at a symmetric position of the ball screw shaft with a center axis as a center, and a bearing formed on each side drum so as to be slidably inserted through the guide shaft. The tire forming drum device according to claim 2, further comprising a hole.   3. The side drum moving means includes a lock mechanism that is arranged on an outer side in the axial direction of one of the side drums and that fixes the side drum by preventing rotation of the ball screw shaft. Or the tire formation drum apparatus of 3.   Either of the said segment moving tool or the center segment piece is arranged with the adsorption body which consists of magnets, and the other is formed from the magnetic body adsorb | sucked to the said adsorption body. The tire molding drum device described in 1.   5. An engaging portion is formed on the inner end of the side segment piece and the outer end of the central segment piece so as to form an uneven shape in the axial direction and mesh with each other in the closed state. The tire forming drum device according to any one of the above. A drum width adjusting method using the tire molding drum device according to any one of claims 1 to 6,
A drum opening step of moving the side segment pieces axially outward from the closed state to the open state by the side drum moving means;
In the open state, the central segment piece is removed from the segment moving tool and replaced with a central segment piece of another size having a different axial width; and
And a drum closing step in which the side drum moving means closes the open side segment pieces in the axial direction by moving them in the axial direction.

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