JPH0675931B2 - Tire former - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a tire molding former for shaping a raw tire into a toroidal shape and integrating the raw tire with a tread breaker assembly.

[Problems to be Solved by Conventional Techniques and Inventions]

In the rubber former type and bladderless type of the former of the conventional single stage molding method, the central portion of the sticking peripheral surface is flexible or is a space. Therefore, it has been difficult to perform a pressure-bonding roller operation for ensuring the close contact of each material (insulation rubber, carcass ply, bead, apex, side worm rubber, etc.) constituting the carcass. Further, the comb-tooth-shaped metal former type needs a rubber cover ring that surrounds the entire peripheral surface of the former in order to close the gap between the comb-teeth segments in the open state.

Therefore, in the present invention, it is a simple structure, it is possible to reliably perform the crimping operation of the tire constituent material, and it is possible to obtain a satisfactory tire constituent material sticking peripheral surface portion without using extra parts, Moreover, it is an object of the present invention to provide a tire molding former capable of reliably centering a center segment.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, a tire molding former according to the present invention has a plurality of segment units each including a center segment and a pair of side segments approaching and separating from each other and arranged in a circumferential direction. A tire forming former, which is provided with a center segment supporting mechanism for supporting the center segment of the segment unit at a center position of the former, the center segment supporting mechanism having one end fixed to one side segment supporting portion. And; mounted on the rod so as to be reciprocally movable in the axial direction, and when the side segment approaches in the axial direction, the inner end surface of the other side segment comes into contact and follows the movement of the other side segment in the approaching direction. A block body that is attached to the block body, A radial elastic member for pulling the ment inward in the radial direction to press the center segment against the side segment from the outside; and an interposing state between one side segment and the block body and the block. And an axial elastic member that presses the body toward the other side segment.

[Action]

If the side segments are moved synchronously in the direction of approaching each other, the block body is pressed in the direction of the other side segment by the axial elastic member and the center segment is pressed by the radial elastic member. Being pulled radially inward, the center segment is pressed together with one side segment towards the other side segment. Then, when both side segments further approach each other, the inner end surface of the other side segment abuts on the block body, and when the side segments further approach each other, the block body resists the elastic force of the axial direction elastic member to the other side. Is pressed in the direction of the side segment until the inner end surface of one side segment comes into contact with the block body. That is, in this state, the center segment is reliably centered and held at the center without protruding from the outer end of the side segment.

〔Example〕

 Hereinafter, the present invention will be described in detail with reference to the drawings illustrating examples.

FIG. 1 shows a tire molding former according to the present invention, which comprises a rigid center segment 1 such as metal or hard plastic and a pair of side segments 2 and 2 (similar to the center segment 1 such as metal or hard plastic). And a cylindrical forming drum 4 in which the plurality of segment units 3 are arranged in the circumferential direction, and the forming drum 4. The shaft 5 to be inserted, a pair of cylindrical slide shafts 6, 6 mounted on the shaft 5 so as to be reciprocally movable in the axial direction, and interposed between the side segment 2 of the segment unit 3 and the slide shaft 6. Guide mechanism 7,7
And slide bodies 8 and 8 mounted on the sleeve 100 or the slide shaft 6 so as to be reciprocally movable in the axial direction, and slide bodies 8 and 8.
Swinging links 9 and 9 for displacing the side segment 2 in the radial direction via the guide mechanisms 7 and 7 by the axial reciprocating movement of
A pressing member 11 that presses the hoisting bladder 10 attached to the slide body 8 outward in the radial direction, and a center segment support structure 12 that causes the center segment 1 to follow the radial displacement of the side segments 2, 2. Is provided, the shoulder portion 13 of the molding drum 4 can be reciprocated in the axial direction, and the outer diameter of the drum 4 can be increased or decreased.

Therefore, the center segment 1 of the segment unit 3 is formed of an arcuate body, and the outer end surface of the center segment 1 is tapered.
Further, the side segment 2 is made of an arcuate body whose circumferential length is the same as the circumferential length of the center segment 1, and its outer end surfaces 15 and 15 are vertical planes.
Notches 17 and 17 are provided in the inner end surfaces 16 and 16, and tapered surfaces 18 and 18 that contact the tapered surfaces 14 and 14 of the center segment 1 are formed. That is, as shown in FIG. 1, in the state where the tapered surfaces 18, 18 of the side segments 2, 2 are in contact with the tapered surfaces 14, 14 of the center segment 1 (axial center length long state), The outer surfaces 19, 20, 20 of the segments 1, 2, 2 are made continuous so that no step is formed. Also, if the side segments 2, 2 approach each other from this state, the side segment
2,2, the front surface 2a, 2a is the back surface of the center segment 1
As they slide closer to 1b, they approach each other, and as shown in FIG. 2, the side segment 2 and the center segment 1 are in a superposed state (a short axial length).

The axial lengths of the side segments 2, 2 and the center segment 1 are set so that the center segment 1 does not protrude from one of the side segments 2 and damage the carcass when the segment unit 3 reciprocates in the axial direction. To be done.

Next, the tubular slide shafts 6, 6 are fitted onto the shaft 5,
The shaft 5 is cantilevered by the former supporting portion, is reciprocally movable in the axial direction by a known driving means, and moves toward and away from each other.

The guide mechanism 7 guides the radial reciprocation of the side segment 2 and reciprocally moves the side segment 2 in the axial direction by the axial reciprocation of the slide shaft 6. , A block 21 continuously provided on the inner surface of the side segment 2 and a block fixed to the slide shaft 6.
22 and a linear guide 23 provided between the blocks 21 and 22
And consists of.

The slide body 8 constitutes the cylinder tube of the cylinder mechanism 24 attached to the slide shaft 6. Here, the cylinder mechanism 24 is a cylinder-shaped fixed piston 25 that is externally fitted and fixed to the slide shaft 6, a cylinder tube that is externally fitted to the slide shaft 6 with the fixed piston 25 being internal, and a fluid supply / discharge. And a flow path 26 for
The slide body 8 is reciprocated in the axial direction by supplying and discharging the fluid from the flow path 26 to the cylinder chamber 27 of the slide body 8.

Further, the slide body 8 is composed of a main body 30 forming a peripheral wall 28 and an inner end wall 29, and a cover body 32 forming an outer end wall 31,
The slide body 8 is provided with a concave circumferential groove 33.
The pressing member 11 is internally provided therein. In the hoisting bladder 10, the inner end 10a is sandwiched and held by the mounting blocks 34 and 35 forming the inner peripheral wall of the concave circumferential groove 33, and the outer end 10b projects from the outer peripheral wall of the concave circumferential groove 33. It is sandwiched and held between the portion 37 and a mounting block 36 attached to the protruding portion 37.

Thus, the pressing member 11 is the ring body 38 made of an elastic body.
And a plurality of pressing bodies 39 that are fitted onto the ring body 38 ...
And the ring body 38 expands in diameter by a fluid such as air, and presses the pressing body 39 as indicated by the arrow. An inner flange portion 40 is provided at the outer peripheral side opening end of the concave circumferential groove 33, and a protrusion 41 that projects outward is provided on the radially inner side of the outer surface of the pressing body 39. The movement outward in the radial direction is restricted. Further, a protrusion 42 that protrudes inward is provided on the radially outer side of the inner surface of the pressing body 39, and the protrusion 42 contacts the block 34. S is a spring that elastically biases the pressing body 39 inward in the radial direction.

Next, the swing link 9 includes the slide body 8 and the guide mechanism 7.
One end 9a is swingably connected to the slide body 8 and the other end 9b is swingably connected to the block 21 of the guide mechanism 7. That is, through holes 43 and 44 are provided at both ends 9a and 9b of the swing link 9, and one through hole is formed.
A pivot shaft 45 attached to the slide body 8 is inserted through 43,
A pivot shaft 46 attached to the block 21 is inserted into the other through hole 44. 47 and 48 are bushes that are fitted onto the pivot shafts 45 and 46.

Therefore, when the slide body 8 reciprocates in the axial direction, the pivot link Oa on the one end 9a side of the swing link 9 reciprocates in the axial direction, and the pivot fulcrum Ob on the other end 9b side moves in the radial direction. The block 21 reciprocates in the radial direction, and the side segment 2 reciprocates in the radial direction. Further, as shown in FIG. 7, there are two types of segment units 3, A and B having different circumferential lengths, and the A and B are alternately arranged along the circumferential direction. Then, the swing link 9 of A and the swing link 9 of B
The length dimensions of B are set differently, and the unit 3 of B is set to be radially inward of the unit 3 of A when the diameter is reduced.

Next, as shown in FIGS. 5 and 6, the segment support mechanism 12 includes a pair of axial rods 53, 53 having one end 53a fixed to one side segment 2 support portion, and the rod 53. ,
Block body attached to 53 so as to be reciprocally movable in the axial direction
50 and a radial elastic member 4 attached to the block body 50
9,49 and axial center elastic members 51,51 for pressing the block body 50 to the other side segment 2 side, and the center segment 1 follows the displacement of the side segments 2,2 in the radial direction. It is what makes me.

Then, the rods 53, 53 are fixed to the block 21 (side segment 2 supporting portion) which is continuously provided on one side segment 2, and the block body 50 is provided with projecting piece portions 52, 52. Through holes 60, 60 are provided in the piece portions 52, 52,
The rods 53, 53 are inserted into the through holes 60, 60, and the block body
The shaft 50 is reciprocally movable in the axial direction along the rods 53. Axial-direction elastic members 51, 51 composed of coil springs are externally fitted to the rods 53, 53 between the block body 50 and the block 21, and the block body 50 is in the arrow direction (that is, the other side block side). ) Is pressed.

A fixed block 55 is fixed to the back surface 1b of the center segment 1 via a fixing tool 65 such as a bolt, and the fixed block 55 is housed in the block body 50. The fixed block 55 includes the main body of the block body 50.
Screw rods 54, 54 inserted into the through holes 61, 61 are screwed from the rear surface side of 64, and the radial rods 49, 49 made of coil springs are externally fitted to the screw rods 54, 54. There is.

Therefore, the block body 50 can be displaced in the radial direction with respect to the center segment 1, but cannot be displaced in the axial direction, and the center segment 1 is pulled inward in the radial direction. Abut on the side segments 2, 2 from the outside.

Next, a method of using the tire molding former configured as described above will be described.

First, the state shown in Fig. 1 (that is, each segment 1, 2, 2
If the slide shafts 6, 6 are slid in the approaching direction from the outer surface 19, 20, 20, ... of which is a continuous surface state, the slide bodies 8, 8 also approach in a synchronized manner with each other. Slide in the direction. At this time, first, each segment unit 3 ...
In the state shown in FIG. 4 (I), since the block body 50 of the support mechanism 12 is pressed in the arrow X direction (axial direction) and the arrow Y direction (radially inward), The other end 62 of the segment 1 rides on the other side segment 2, and the other side segment 2 approaches the one side segment 2 with its front surface 2a sliding on the back surface 1b of the center segment 1. . In this case, the center segment 1 floats up as shown in FIG. 4 (II), but the block body 50 can be displaced in the radial direction, so that the movement can be dealt with.

Then, as shown in FIG. 4 (III), after the inner end surface 16 of the other side segment 2 comes into contact with the block body 50, the other side segment 2 is repulsed by the axial elastic member 51. The center segment 1 is pressed against the force in the direction of the arrow X '. Therefore, one end 63 of the center segment 1 rides on one side segment 2. Then, if the side segments 2, 2 are brought closer to each other from this state, the center segment 1 moves together with the other side segment 2 in the direction of the arrow X ', and the one side segment 2 has its front surface 2a. Slides on the back surface 1b of the center segment 1 and approaches the other side segment 2. That is, the axial length of the forming drum 4 changes from L to L ', as shown in FIGS. 1 and 2.
In the center segment 1, the segment unit 3 is in the axially long state (when the forming drum axial length is L) and in the axial short direction (when the forming drum axial length L ').
At, the molding drum 4 is held at a substantially center position in the axial direction.

Next, from this state (state shown in FIG. 2), the slide body 8
.. are slid in synchronism with each other, the side segments 2, 2 of each segment unit 3 are displaced inward in the radial direction, resulting in the state shown in FIG. That is,
The outer diameter of the molding drum 4 is reduced.

In order to manufacture a tire using the tire forming apparatus configured as described above, as shown in FIG. 1, each segment unit 3 is set in the axial length and length state, that is, the former is expanded. A carcass molding material is attached to the molding drum 4 to mold a cylindrical carcass 58, and the carcass end portion protruding outward from the outer end surfaces 15, 15 of the side segments 2, 2 is formed by a known turn-done finger. Fold down and hit the bead rings 57,57 sideways.Outer end face 1 of side segment 2,2
It is mounted via the carcass end folded into 5,15. In this state, a fluid such as air is injected into the hoisting bladders 10, 10 to wind up both ends of the carcass around the bead ring 57.

Next, the fluid of the hoisting bladder 10, 10 is removed, and the pressing member 11,
As indicated by the phantom line in FIG. 1 at 11, the diameter of the bladder 10, 10 near the bead portion 59 of the carcass 58 is expanded to
Is pressed against the bead portion 59, and in this state,
A fluid such as air is injected into the carcass 58 while the slide shafts 6, 6 are brought close to each other, and the carcass 58 is expanded in a toroidal shape. At this time, the breaker tread assembly is transferred to this forming drum to integrate the carcass 58 and the breaker tread assembly.

After that, as shown in FIG. 3, the slide bodies 8 and 8 are separated from each other to reduce the outer diameter of the molding drum 4, and the unvulcanized tire molded in a toroidal shape is taken out from the molding drum 4. Do.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

With respect to the axial reciprocating movement of the side segments 2 and 2, the center segment 1 does not jump out from the side segments 2 and 2, and the molding drum 4 is at the substantially central position in the axially long and short axial states. The center segment 1 is held at a fixed position (substantially the central position) of the forming drum 4 when the material is attached and does not deform the toroidal shape of the carcass 58 during the shaping process. Further, the work of crimping the tire constituent material can be reliably performed, and a satisfactory peripheral surface portion for sticking the tire constituent material can be obtained without using a rubber cover ring or the like.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention in a lengthwise axial length state, FIG. 2 is a cross-sectional view of a short axial lengthwise portion, and FIG. 3 is a cross-sectional view of a reduced diameter state, FIG. 4 is an operation explanatory view of the segment unit, FIG. 5 is an enlarged plan view of an essential part, FIG. 6 is an enlarged side view of the essential part, and FIG. 7 is a simplified side view of the segment unit. 1 ... Center segment, 1b ... Back surface, 2 ... Side segment, 2a ... Front surface, 3 ... Segment unit, 16 ... Inner end surface, 49 ... Radial elastic member, 50 ... Block body , 51 …… Axial elastic member, 53 …… Axial rod, 53a …… One end.

Claims (1)

[Claims] 1. A tire molding former in which a plurality of segment units 3 including a center segment 1 and a pair of side segments 2, 2 approaching and separating from each other are arranged in a circumferential direction, Above segment unit 3
A center segment support mechanism 12 for supporting the center segment 1 of the center segment 1 at the center of the former is provided, and the center segment support mechanism includes an axial center rod 53 whose one end 53a is fixed to one side segment 2 support portion, and the rod 53. Is mounted so that it can reciprocate in the axial direction, and the side segments 2 and 2 approach each other in the axial direction,
A block body 50 that abuts the inner end surface 16 of the other side segment 2 and follows the movement of the other side segment 2 in the approaching direction, and is attached to the block body 50, and the center segment 1 is arranged in the radial direction. A radial elastic member 49 that pulls inward to press the center segment 1 against the side segments 2 and 2 from the outside, and is interposed between one side segment 2 and the block body 50. A tire molding former comprising: an axial elastic member 51 that presses the block body 50 toward the other side segment 2 side.