JPS602979B2 - Tire tread forming method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This application is a patent application of U.S. Patent Application No. 706,712 (filed July 19, 1979).

The present invention relates to a method and apparatus for forming a tire tread, in particular:
The present invention relates to a method and apparatus for forming treads on rubber materials with tread forming shoes.

In forming tire treads, upper and lower mold sections are provided, each mold section having a device for forming the tread pattern.

In known embodiments, each mold section has a rigidly attached solid ring forming the pattern of the base surface, and in other known devices, each mold section has a resiliently attached split ring ( i.e., individual tread shoes). A common practice in both systems is to first completely close the two mold sections together and then apply fluid pressure to the tire, forcing the rubber into contact with the tread forming shoes. It is believed that a split ring constructed as described above has certain advantages over rigidly mounted solid ring systems when the mold parts are moved apart such that the tire can be removed. , the resiliently mounted shoe moves radially outward a distance greater than the depth of the tread groove, so that the tire can be removed from the device without distorting the tread. In these conventional systems, the tire is inflated and inflated to press the rubber against the tread shaping device, so that the expansion and the force used to shape the tread are both radial and circumferential. There is a backward direction that displaces the reinforcement from its ideal position.

It will be appreciated that for a tread formed on a tire, it would be advantageous if the tire structure was maintained in its ideal position during formation of the tread by isolating forces on the reinforcement of the tire.

It can also be seen that it would be advantageous if a suitable shaping of the tread surface could be obtained and the method and apparatus for carrying out the iron method be extremely simple and efficient.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a device for forming treads in rubber materials by the use of a tread forming shoe device.

A further object of the invention is to provide an apparatus which achieves the above-mentioned objects and which provides convenient and easy handling in forming the foundation.

Yet another object of the invention is to eliminate inflation and expansion of the tire during tread shaping, in order to prevent the radial and circumferential reinforcements from being displaced from their ideal position. It is a further object of the present invention to provide a mounting area which achieves the above-mentioned objects and which is simple in construction and effective in use. That's true.

A further object of the invention is to provide a method for forming treads in rubber materials which is extremely effective and simple to carry out.

- Historically speaking, the present invention of forming a tread in an elastic material includes a body and an elastic material attachable to the body adjacent to both sides of the body.

Additionally, there is a first member and a first tread forming shoe device movably mounted relative to the first member for movement between an outwardly expanded position and an inwardly retracted position. A resilient spring device operably couples the first member and the first tread forming shoe to resiliently bias the first tread forming shoe device toward its outwardly expanded position. Additionally, a second member and a second road forming shoe assembly are provided that are movably mounted relative to the second section fence for movement between an outwardly expanded position and an inwardly retracted position. A resilient spring device operably couples the second member and the second tread forming shoe device to resiliently bias the second tread forming shoe device to its outwardly expanded position. The first and second members are positionable such that relative integral interlocking of the members moves the first and second tread forming shoe devices to their inwardly retracted positions, thereby , the first and second tread forming shoe devices are positioned adjacent opposite sides of the body to form a tread on an elastic material affixed to the body. Furthermore, a device is provided for moving the first and second members relatively together. Generally speaking, a method of forming a tread in an elastic material includes applying the elastic material to the body adjacent to each side of the body and moving the pupil into an outwardly expanded position and an inwardly constricted position in a first member. the body portion is installed on a first tread-forming shoe movably mounted on the first member such that the body portion is movably mounted on the first member; It has a procedure for energizing it.

The method further includes moving a second member to bring a second foundation forming shoe device adjacent the body portion; A second foundation forming shoe device is arranged in the outwardly expanded & straightened and inwardly retracted positions.
The second full-surface shoe device is movably mounted to the second member for movement relative to the member and includes a procedure for resiliently biasing the second full-surface shoe device to its outwardly expanded position. The method further includes: further moving the first and second members together relative to each other to move the first and second tread forming shoe devices to the body; contacting a resilient material located on the body adjacent to both sides of the body. These and other objects of the invention will become clearer from the following description with reference to the accompanying drawings. 1 and 2 show the overall apparatus 20 of the present invention.
shows.

As shown, the beam structure 22 includes a body 24 of a cylinder 26 secured to the structure having a downwardly extending rod end 28. The rod end 28 has a ramp member 3 fixed to the rod machine 28 with a respective eye 34 attached thereto.
0.32. The first or upper member 36 has four eyes 38 attached to its upper surface, and a chain 42 connects the eyes 34, 38 as shown in FIGS. Note that due to the extension and contraction of the rod end of the cylinder 26 or the rod 28, the slope members 30 and 32 are
6 to be raised and lowered. The lower part 44 is suspended on a frame 46 resting on the floor. Details of the upper and lower sections 36, 44 are clearly shown in FIG. As shown in FIG. 3, the lower member 44 has an annular recess 46, the outer surface of which is sloped downwardly and inwardly to form a slope.

Six tread-forming shoes 50 are spaced around the annular recess 46 in contact with the ramp 48 .

Further, the upper member 36 has an annular recess 52 and has a side fold 5.
As shown in FIG. 3, the outer slope 54 of No. 2 is inclined upwardly and inwardly to the capital 36, contacts the slope 54 and displaces it, and is separated around the annular recess 52 of the capital 36. Six foundation molding shoes 56 are provided. The fin-shaped shoe 56 is held by an oblique bolt structure 58 so as to move along the slope 54. Each bolt structure 58 includes a bolt 59 having an end that extends through a stepped bore 60 formed in shoe 56 and threadably engages member 36 . The sleeve 61 contacts the fillet 36 and extends to the step 65 of the bore 60 and is located around the bolt 59. The washer 67 is
5 and the sleeve 61, and the face 69 of the bolt 59 is pressed against them. Adjacent forming shoes 50 are also attached to member 44 in a similar manner. Tread molding shoe 56
It will be appreciated that with this arrangement on the backing 36, the foundation forming shoe 56 is movable into an expanded position outwardly with respect to the backing 36 and into a retracted position inwardly with respect to the member 36. Similarly, the tread forming shoe 50 is movable into an expanded position outwardly with respect to the member 44 and a retracted position inwardly with respect to the member 44. The elastic spring 62 is connected to the molded shoe 50
member 44 to resiliently bias the member 44 to its outwardly expanded position.
and the chamfer molding shoe 50 are connected. Similarly,
A resilient spring 64 connects the member 36 and the base molded shoe 56 in the outwardly expanded position of the shoe 56. As shown in FIG. 3, each tread shoe 50 has a recess that substantially aligns and mates with the hole 68 in member 44 during movement of the tread shoe 50 from its outwardly expanded position to its inwardly retracted position. It has 66.

Once the recess 66 is substantially aligned with the hole 68, an elongated shaft 70 in the form of a bolt can be inserted into the aligned hole 68 and the recess 66, thereby causing the tread molding shoe 5 to open. Under the bias of spring 62 to the outwardly extended position, movement between the outwardly extended and inwardly retracted positions is restricted. The tread molding shoe 56 and the member 36 have similar construction and therefore the resilient spring 6 to the outwardly expanded position of the shoe 56
4, the interlocking of the tread forming shoe 56 is selectively limited. The body 72 used in the mechanism described above is shown in FIGS. 4-9. As shown in these, body part 7
2 is made of a disk 73 (FIG. 5) with portions 75, 77 fixed on opposite sides thereof. Two circular rings 79, 81 are resiliently mounted on opposite sides of the disc 73.

The rings 79, 81 and the outer portion of the disk 73 are connected to the rib 7.
form 6. Therefore, the body portion 72 has a substantially annular shape.
4, and a rib 76 located surrounding the outer periphery of the main body portion 74.
It is made from. The ear portion 78 is fixed to the outer periphery of the rib,
It is located on the opposite side of the body portion 72. The utility of the ears 78 will be explained in detail below. As best seen in FIG. 5, the body 72 has a passageway 80 extending from the outer periphery of the lip 76 to the interior of the body 72 and receiving an annular passageway 82 formed within the body 72.

Yet another annular passage 84 is formed in the body 72 , and the two annular passages 82 , 84 are connected by a rattan passage 86 . The annular passageway 84 fits into a further passageway 88 extending around the outer circumference of the lip 76, as shown in FIG. The cooling liquid flows through the passage 80
It will be appreciated that it can be introduced in a circular manner into the annular passage 82 , through the annular passage 82 , through the transverse passage 86 into the annular passage 84 , and from there through the passage 88 .

As clearly shown in FIGS. 7 and 9, still other passages 90 include:
Extending from the outer periphery of lip 76 is a small third annular passage 92 formed in body 72 .

The body portion 72 has a plurality of movably mounted valve members 94, each valve member 94 located at a position where its head outer surface 98 coincides with the outer surface 10 of the body portion 74, i.e., the valve member 9.
4 to the retracted position by a spring 96. Valve member 94 is movable against the resiliency of spring 96 such that its outer head surface 98 extends to a position where it protrudes from surface 100 of body portion 74 . Each povet valve member 94 is movable within a chamber 102, a portion of which is
Each chamber 102 is defined by a portion of the inner head surface 104 of the valve member 94 and communicates with the annular passageway 92 via a passageway 106. When compressed air is applied to the passageway 90, the compressed air flows into the annular passageway 92. It can be seen that the lotus flows into the chamber 102 through the passage 106 and moves the valve section 94 to an extended position, the head surface 98 of which protrudes from the surface 100 of the body section 74. Yet another passageway 108 (FIG. 4) communicating with another internal annular passageway 1101 formed in the body 72 is configured in a similar manner to actuate a plurality of other povet valve members 112 in a similar manner. used.

The bodies 114 of the plurality of cylinders 116 are fixed to the lower surface 113 of the capital material 44 (FIGS. 1 and 2), and the rods 118 thereof
passes through the flange portions 120, 122 formed on the backing material 44 and exceeds the upper surface 124 of the flange portion.

Each rod 118 has an elongated fixed lug 1 fixed thereto.
26, the lugs 126 can be re-grained by rotating the rod 118 about the longitudinal axis of the rod 118 through respective elongated entrances 128 formed on the flange 13 of the section 36. It will be appreciated that upon relative movement of both members 36, 44 (FIGS. 1 and 2), a suitably positioned locking lug 126 may pass through a respective opening 128 in flange 130. The individual locking lugs 126 then contact a portion of the upper surface 132 of the flange 130 and pull the members 36, 44 together with a relatively large force upon downward movement of the rod 118 of the cylinder 116.
26 is rotated to some extent. The cylinder 116 is
Of course, it can be operated in a known manner, for example in the main cylinder (
(not shown). In use of the device, the body 72 is lifted with a forklift (not shown) and the fork arms are placed under the ears 78 for proper transfer.

The body 72 is moved to a furnace and the unvulcanized rubber material is placed in the form of one strip 134, 136 surrounding the body, with the rubber adjacent one side 140 and the other side 138 of the rib 76. and installed on the main body 74 (see FIG. 10).
The fork IJ foot then has a rubber strip 134,
136 is moved adjacent the upper and lower members 36,44. The forklift then places the body part 72 on the Miyakomura 44. At this time, the tread forming shoes 50, 56 are in their fully expanded position and
It is heated by applying a heating fluid through a circuit device formed in the materials 36,44. The rib 76 is positioned such that one side 140 thereof contacts the tread forming shoe 501 (see FIG. 10). The forklift then moves away from the area of members 36,44. Member 36 is lowered relative to member 44 in cylinder 26 so that locking lug 126 passes through opening or hole 128. Fixed lug 126
is then rotated into position and retraction of rod 118 of cylinder 16 causes member 36 to be pulled into member 44. During this downward movement of member 36, tread forming shoe 56 comes into contact with other side 138 of rib 76. The cylinder 116 then transfers the member 36 to the material 44.
The cylinder 26 is of course sufficiently extended to allow sufficient slack in the chain 42 for this further downward pulling of the member 36 (FIG. 11).

Tread molded shoes 50, 56 are located on opposite sides 140 of rib 76.
During this further downward movement of member 36 while in contact with 138, further movement of members 36, 44 together results in relative movement between tread forming shoes 50, 56 and body 72. The tread molding shoes 50, 56 then move along the surfaces of the sides 140, 138 of the body 72 so as to contact the rubber materials 134, 136 on the body 72, and the relative movement It is recognized that it is determined by the shape of
This allows the tread to be formed. The shoes 50,56 come into contact with the rubber material 134,136. That is, the movement of the tread molding shoes 50, 56 and the body 72 is such that the body 72 is kept warm in a predetermined position and the shoes 50, 56 slide along the sides 140, 138 of the rib 76. This is done relatively, so that a proper shaping of the tread on the rubber material 134, 136 is obtained. During this process, the cooling fluid flows through the passages 8
0 and flows through the annular passages 82, 84 to the body 72.
and provides the body 72 with the appropriate working temperature.

Since the tread-forming shoes 50, 56 are heated, the rubber material 134, 136 has a tendency to adhere to the shoes more than the cooled body 72. Members 36 and 44 are the first
When positioned as shown in Figure 1, the shaft or bolt 70
are inserted within the holes 68 and recesses 66 to limit the movement of the tread-forming shoes 50, 56 under the bias of the springs 62, 64 to the outwardly extended position and to the outwardly extended position. position between the inward contracted position. Member 36 is moved a short distance from member 44 and the tread forming shoes 50, 56 are moved to their outward expansion limited by bolts 70 as described above.
As a result, the tread molding shoes 50, 56 are attached to the body portion 72.
The rubber material 134,
136). At this point, air is directed to the passageway 90, to actuate the povet valve member 94,
108 , such that the head outer surface of the valve member extends beyond the outer surface 100 of body portion 74 and the air is introduced into body portion 72 .
The rubber materials 134, 136 are allowed to be pressed against the rubber material 134,136. This ensures that the rubber material 134 , 136 remains in contact with the tread forming shoes 50 , 56 and does not contact the body 72 . Next, the capital material 36
4 (FIG. 12), the body 72 moves further from the member 36
, 44.

FIG. 13 shows the member 44 with the rubber material already loaded.
An annular core 150 is shown located above.

Member 36 now again becomes adjacent member 44 until tread shoe 56 contacts tread shoe 50. At this point, as described above, further relative movement of members 36, 44 together via actuation of cylinder 116 causes rubber material 134, 13 to contact tread forming shoes 50, 56.
6 is moved so as to touch the rubber material 152 of the annular core (see FIG. 14). The vulcanized rubber material 134, 136 in contact with the tread-forming shoes 50, 56 is caused by the movement of the tread-forming shoes 50, 56 into the inward retracted position to cause the core "1"
5. It comes into contact with the rubber material 152 located at this point. Once the tread-forming shoes reach the retracted position, the bolts 70 are removed and, after vulcanization of the entire rubber material, the member 36 is moved from the section 44 as described above and the tread-forming shoes 50,56
under the elasticity of springs 62, 64 to its fully outwardly expanded position as shown in FIG.
0 and leave it there. A portion of another embodiment of body 200 is shown in FIG.

As shown in the figure, the overall structure of the body portion 200 is particularly
It is substantially similar to the body 72 in the figures. As shown in FIG. 16, the body portion 200 includes a portion 204 fixed on opposite sides,
It is made from a disk 202 having 206. This collectively forms an annular body portion 208 , and ring-shaped movable body members 210 , 212 are movably mounted on the body portion 208 and form a lip 209 together with a portion of the disc 202 .
Resilient elastic members 214 and 216 are provided between movable members or rings 210 and 212 and disk 202, and rings 210 and 212 are elastically biased to be separated from both sides of disk 202. Ru. Each IJ number 210,2
The inner circumferences 218 and 220 of 12 correspond to the outer surface 22 of the main body 208.
1,223. Ring 21 has a plurality of passages passing through it (one of which is indicated at 222); similarly, ring 212 has a plurality of passages (one of which is indicated at 224) passing through it. are doing.

These passages are formed in an annular recess 2 formed in the body portion 208.
26 and another annular recess 228 formed in the body portion 208.
and is led adjacent to. Additional rings 232, 234
are movably mounted on opposite sides of the body portion 200, and are resiliently biased toward the outer pupil by a spring device 236, as in the embodiment of FIG.

In use of the device, the tread-forming shoe rests against the rings 210, 212 as described above, and the body portion is, for example, approximately the first
When in the position shown in Figure 1, the elastic members 214, 216 are compressed under the pressure of the shoe.

In this state, the tread molding shoe is on the surface 2 of the body 200.
21 and the surface 223 of the body 200, the excess elastic material flows into the annular recess 226 under the pressure of the shoe and leaves the device through the passage 222 of the ring 210. ),leak. Similarly, the elastic material flows into the annular recess 228 and into the passage 222 of the ring 212.
4) from the device. ring 232,2
34 is in contact with the shoe and acts as a barrier to hold the elastic material in place. Therefore, the flow of elastic material during the tread forming operation is allowed in the embodiment shown in Figure 16, so that any material pressure from the tread forming area is relatively free to be released from that area. It is recognized that it is guaranteed. The excess elastic material initially
00, the elasticity of the spring device 236 overcomes this and the excess elastic material is removed from the rings 232, 234.
is allowed to flow past the edges of the

After insertion of bolt 70, raising member 36 from member 44 (equivalent to that shown in FIG. 12) causes elastic member 214,
The force compressing 216 is removed from rings 210, 212 and no longer provides communication between region 230 of body 200 and annular recess 226 or between region 231 of body 200 and annular recess 228. The rings 210, 212 are allowed to move to a different position. When the rings 210, 212 move under the elasticity of the elastic sections 214, 216, the body section 2
Inner circumference 218, 2 of ring 210, 212 adjacent to 08
The edge green in 20 is the Satoshi molding area 230, 231
act as a cutting member to cut the elastic material flowing into the annular recesses 226, 228, leaving on the body 200 an elastic material of suitable shape and dimensions with suitable molded treads. This cutting operation is ensured upon said displacement of member 36 from member 44, which
14, 216 prevents flow from regions 230, 231 of elastic material through passages 222, 224
10, 212 are elastically biased. In yet another embodiment, the elastic material need not necessarily be initially applied to the body adjacent to both sides of the body as in FIGS. 10 and 11.

Rather, as shown in FIG. 17, the body 300 includes a plurality of upper passageways 302 and a plurality of lower passageways 304, all of which are connected to the head end 308 of the shilling 310.
The lotus is suitable for the main conduit 306 that goes around. In this system,
After the first and second members 36, 44 are brought together prior to the introduction of any elastic material forming the road surface (18
), the shilling 310 is actuated, and the elastic material 312 is
The elastic fluid flows through conduit 306, through passageways 302, 304 in body 300, into body 300, and into the cavity formed by the surface of body 300 and the surfaces of adjacent molded shoes 50, 56. The material comes to have a tread formed therein during this operation. The backing material 36 is then removed from the member 44 after the bolt 70 is inserted, as shown in FIG. 19, with the resilient material 314, 316 remaining on the shoes 56, 50 in accordance with the previously described embodiment. The subsequent steps in this method are the same as those shown in FIGS. 13-15. In yet another embodiment, member 36' is a conduit.
354, 356 are provided with passages 350, 352 that are smoky;
Conduits 354 and 356 communicate with a main conduit 358 that communicates with a head end 360 of cylinder 362.

Similarly, member 44' includes passageways 364, 366 communicating with conduits 368, 3701, and conduits 368, 370.
The conduit 372 is connected to the head end 374 of the other shilling 376 . The cylinders 362, 376 are filled with an elastic material 378, which flows into the appropriate tread-forming area via the already integrated members 36', 44', to which the body 72 has previously been affixed. It does not have any elastic material attached to it. In still other embodiments, a portion of the elastic material is first applied to the body 72 and the remaining required elastic material is applied according to the embodiment of FIGS. 17-19 or the embodiment of FIG. It is recognized that it is permissible to do so.

Although both embodiments described above have center-separated mold devices, the separation line of the mold portions does not necessarily have to be approximately at the center of the overall device, but may be spaced apart from the center. That is, the mold device may be of the edge-separated type or the shoulder-separated type.

[Brief explanation of the drawing]

Fig. 1 is an overall front view of an embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a sectional view of the main parts of the same, and Fig. 4 is a plan view of the body used in the above device. Figure 5 is the same V as above.
6 is a sectional view taken along the line W- in FIG. 4, FIG. 7 is a sectional view taken along the skin-to-skin line in FIG.
The figure is a sectional view taken along the W-Ichibata line in Fig. 4, Fig. 9 is a sectional view taken along the KK line in Fig. 4, Figs. 10 to 15 are illustrations for explaining the operation of this device, and Fig. 16 is a diagram similar to FIG. 9 of another embodiment of the body, FIGS. 17 to 19 are operation explanatory diagrams of another embodiment, and FIG. 20 is an operation explanatory diagram of still another embodiment. Inside, 36 and 44 are upper and lower members, 50 and 56 are tread forming shoes, 62 and 64 are elastic springs, 66 is a recess, 68 is a hole in the backing material, 70 is a shaft, 72 is a body part, 74, 208 is a main body, 76 is a lip, 80, 88 are passages, 82, 84 are annular passages, 86 is a lateral passage, 94, 112 are povet valve members, 9
6 is the spring of the valve member, 98 is the outer surface of the head of the valve member, 100
106 is a passage to the valve portion, 116 is a cylinder, 118 is a rod, 126 is a fixed lug, 134,
136 is a rubber strip, 138, 14 is the other side and one side of the rib, 150 is the core, 152 is the rubber material of the core, 2
10, 212 are movable body members, 214, 216 are elastic materials, 218, 220 are inner peripheries of the movable body members, 222, 224
is a rubber outflow passage, 302 and 304 are upper and lower passages,
306 is a main pipe, and 310 is a rubber cylinder. FIG-IF -2 FIG-8 FIG-9 FIG-3 FIG-4 FIG-5 FIG-6 FIG-7 FIG-10 FIG-11 FIG-12 FIG-13 FIG-14 FIG-15 FIG-16 F ! G-17 FIG-18 FIG-19 FIG-20

Claims (1)

[Claims] 1. Move an unvulcanized elastic material placed on the outer surface of the annular body part to a pair of members, move the pair of members to contact the elastic material on the body part, and With the vulcanized elastic material attached to the pair of members from the body part, the pair of members are separated, and then the unvulcanized elastic material attached to the pair of members is attached to the unvulcanized material placed between the members. up to the point where it contacts the vulcanized tire carcass.
In the method of forming a tread on the unvulcanized tire carcass by attaching the unvulcanized elastic material to the tread area of the unvulcanized tire carcass by moving the pair of members,
The step of moving the unvulcanized elastic material to the pair of members includes forming a tread surface on the unvulcanized elastic material from a position where a plurality of tread forming shoes attached to the pair of members are extended outward. moving the shoe radially inwardly to a retracted position, and then moving the shoe radially outwardly to a position intermediate between the inwardly retracted position and the outwardly extended position; A method for forming a tread comprising the step of providing a slight gap between an unvulcanized elastic material attached to a shoe and the body and an unvulcanized tire carcass. 2. The method according to claim 1, wherein the step of moving the shoe to an intermediate position includes resiliently pressing the shoe from an inwardly retracted position to an outwardly extended position; selectively restricting movement of the shoe to the intermediate position. 3. Spraying unvulcanized elastic material into a pair of annular spaces respectively formed between the annular body and the pair of members to form a tread shape on the band-shaped unvulcanized elastic material in the spaces, When the pair of members is moved from the annular body, the unvulcanized elastic material is held on the pair of members, and then the unvulcanized elastic material is placed on the unvulcanized tire carcass located between the pair of members. By moving the pair of members to a position where the unvulcanized elastic material held by the member is attached, the unvulcanized elastic material is attached to the tread area of the unvulcanized tire carcass and the unvulcanized material is attached. In the method for forming a tread on a tire carcass, the step of holding an unvulcanized elastic material on the pair of members includes a position in which a plurality of shoes mounted on the pair of members are retracted inward and an outer position. and the unvulcanized tire carcass. A method of forming a tread characterized by. 4. The method of claim 3, wherein the step of moving the shoe to an intermediate position includes resiliently pushing the shoe from an inwardly retracted position to an outwardly extended position; selectively restricting movement of the shoe to the intermediate position.