JPS5946782B2 - Tire manufacturing method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for manufacturing tires, particularly belted tires for trucks and similar vehicles, quickly and accurately.

Traditionally, truck tires have been manufactured commercially by methods and/or equipment similar to that employed in passenger car manufacturing, in which a ply containing a carcass is wrapped around a carcass-forming drum and then was seamed into an endless form while on the drum.

Alternatively, such a tire may be made such that the band is spliced elsewhere into an endless form and then pre-tucked into a carcass-forming drum, expanding and tightening to the appropriate axial position during this operation. (or) was manufactured in a twisted condition.

In both of these known processes, physical limitations of the drum have prevented a sufficient difference between the bead diameter of the tire being manufactured and the diameter of the drum on which the carcass ply is wound.

This diameter difference is referred to as the drum crown and is distinguished herein from the final tire crown diameter.

The above-described method often resulted in distortion of the ply when it was applied to conventional drums, whether endless or not.

The object of the invention is to accurately and quickly manufacture tires particularly suitable for trucks and similar vehicles.

Another object of the present invention is to preform an endless band into a cylindrical shape,
without changing the circumference of the cords of the band or disturbing the alignment of the cords of the band, transfer said endless band in precise concentric relation to the carcass-forming drum, while the carcass-forming drum remains cylindrical with a smaller diameter than the band. It is an object of the present invention to provide a tire manufacturing apparatus which further enables the forming drum to be expanded to be exactly concentric with the band.

The above objects and other objects and advantages, which will become apparent from the following description or are particularly different, are achieved by the method according to the invention.

The method of the present invention includes forming an endless, unitary cylindrical band on a rigid cylindrical surface having a circumference intermediate the respective circumferences of the bead and the crown of the tire, and removing the band from the cylindrical surface. while removing the band, supporting the band in fixed relation to its axis t, and freely translating the band coaxially from said cylindrical surface into concentric relation with the carcass-forming drum, said carcass-forming drum having said Having a cylindrical shape with a smaller circumference than the band during translation, the axial end of the band extends outwardly from the end of the carcass-forming drum, and then fully expands the carcass-forming drum so that the inner surface of the band and sweeping the ends of the band inwardly at each end of the carcass forming drum to form a radially extending shoulder at each end of the carcass forming drum. In other words, a non-stretchable bead core (
(hereinafter referred to as beads) in contact with each shoulder and folding the remaining ends of the band outward around the beads and shoulders to form a carcass; further expanding while simultaneously moving the end beads of the carcass-forming drum coaxially toward the central periphery to take on a toroidal shape while still on the carcass-forming drum.

In another aspect, the invention provides the step of simultaneously forming an endless, unitary, circumferentially inextensible belt on a second rigid cylindrical surface remote from the first surface. enclosing the belt in a cylindrical rigid split ring coaxially and concentrically disposed with the belt and compressing the rigid cylindrical surface inwardly; forming a preformed carcass on a carcass forming drum; from a cylindrical to a toroidal configuration while rocking the carcass-forming drum angularly about a vertical axis so that the axis of rotation of the drum coincides with the axis of the belt, concentric with the carcass on said drum. transporting said ring and belt into relationship, continuing to expand the carcass radially so as to uniformly concentrically and circumferentially contact the inner surface of said belt, moving the segments radially outwardly and moving the ring axially; moving the ring away from the belt by moving the ring in a direction and again rocking the carcass-forming drum about a vertical axis while crushing the carcass-forming drum to remove the tire.

Furthermore, according to the invention, an apparatus for carrying out the above method for tire manufacturing comprises a turret device rotatable about a vertical axis and a drum axis perpendicular to and intersecting said vertical axis. a carcass forming device arranged to rotate; a band forming device arranged to rotate around a band axis perpendicular to and intersecting said vertical axis; and both said vertical axis and said band axis. and a belt forming device arranged to rotate about a belt axis perpendicular to and intersecting the belt axis, the turret device being selectively rotatable to align the carcass forming device coaxially with the band axis. to allow the cylindrical tire band to be transferred from the band forming device to the carcass forming device, and align the tire forming device coaxially with the axis of the belt to transfer the cylindrical non-stretchable belt to the carcass forming device. to the carcass forming apparatus.

It should be appreciated that the non-stretchable belt can be made of a single ply of woven cord or wire or multiple plies suitably consolidated to form an integral belt.

Preferably, although not necessarily, the structure referred to herein as a belt includes one or more layers of rubber or rubber-like material that provides the tread of the tire being formed.

In the following description, preferred embodiments of the invention will be described with reference to the accompanying drawings.

Referring to FIG. 1, an apparatus 10 of the present invention includes an apparatus A for manufacturing an endless, one-piece tire band, transferring said band to form a tire carcass, and reproducing the tire carcass. It includes a device B for arranging and forming it into a toroid.

The apparatus 10 includes apparatus C for producing a non-extensible endless belt, which belt is transported in concentric or co-centered relation with the tire carcass formed by apparatus B.

Apparatus A includes a band-forming drum A12 and a feeding device A14 for feeding band-forming material to the drum A12.

The band-forming drum A12 provides an axially and circumferentially continuous rigid cylindrical surface A13 that rests on a spindle A16 carried as a cantilever on suitable bearings (not shown) in the housing A1B. It is rotatably attached around the axis A15.

Housing A1B is a rigid floor-mounted structure that extends upwardly to suitably support the overhead bridge structure, which is omitted in FIGS. 1 and 2.

The supply device A14 includes a plurality of material conveyors A20,
Each material conveyor has a conventional discharge device A22. A series of band-forming material is conveyed from one of the associates A23 to drum A12.

Each conveyor A20 includes an articulated movable end A26 which is arranged around a central circumference to provide an unobstructed space around the drum A12 to permit axial movement of the band transfer device. It is possible to approach or move away from the drum A12 in a direction parallel to the plane A30.

A separate discharge device A32 is cooperatively associated with the feed device A14 to provide bead chafer strips or the like.

Apparatus B has an axis B on a rotatable spindle (not shown).
It includes a carcass-forming drum B40 mounted for rotation around 41, the spindle being cantilevered by suitable bearings (not shown) provided in a housing B42.

The housing B42 is carried on a rotatable plate or turntable B44, which on the one hand is supported on a large diameter lower bearing arrangement B46.

The housing includes a column B48 carrying an upper bearing B49.
, the upper bearing being disposed coaxially with said bearing arrangement B46 and a vertical axis B50, the arrangement B being in position B-1 as shown in FIG. -2 around the vertical axis B50.

Location B-2 is shown in FIG. Position B-3 where the device is in the middle
When in position, the drum B40 can be collapsed to remove the tire.

The carcass forming drum B40 is a polymorphic drum, collapsed to a diameter smaller than the bead diameter of the tire, with an elastomeric tubular sleeve B5 providing an external cover for the drum.
2 is held firmly in place to provide a circumferentially and axially continuous surface B53 terminating in a radially inwardly extending shoulder B54; A toroid state in which the shoulders are pushed out and move coaxially toward the central circumferential surface B50 (
(see Figure 2).

The bead sweeping, bead setting and bead folding mechanism B63 is provided between the drum B40 and the housing B42 so as to share an axis with the drum, that is, to be coaxial.

A substantially identical second bead sweeping, bead setting and folding mechanism B65 is provided on a carriage B67 coaxially (moves toward and away from the drum B40).

These mechanisms B63. B65 cooperates with drum B40 to sweep the protruding edges of the band inward, placing a non-stretchable bead ring against the outside of the band supported by shoulder B54, and aligning the end of the band with the bead. Fold radially outward.

The carriage B67 has a common axis A15. between the coaxial position and the standby position 67' shown in FIG. It is installed so that it moves at right angles to B41.

Apparatus C includes a belt forming drum C70;
0 is rotatably mounted about axis C71 on a spindle (not shown) carried as a cantilever by suitable bearings (not shown) in housing C72.

Housing C72 is a rigid structure supported on the floor and extends upwardly to support the overhead bridge structure described below.

The drum C70 provides a rigid cylindrical surface C73 on which an endless inextensible belt of belt plies is formed.

A plurality of radially movable segments C74 forming drum C70 are retractable from surface C73 to release the belt for axial displacement from drum C70.

The apparatus C also includes a ply material feeder C75 including a plurality of belt ply material conveyors C77 extending parallel to the central circumferential surface C80 of the drum C70, the conveyors being positioned one above the other; Each conveys an individual ply unit from an associated supply roll C82 to drum C70.

The feeding device C75 is attached to a pivot C79 and supported by a guide track C87.

FIG. 2 shows an air cylinder C90 or an equivalent power unit connected to a fixed support structure C92 and angularly displaced about a pivot axis C79 from the position shown in FIG. The supply device C75 is swung to the second position 75' shown in FIG.

Device C includes a tread supply device C95 having a storage conveyor C97 and a supply conveyor C98.

The supply conveyor is supported on parallel rails C101 of structure C92 and is movable thereon in a direction parallel to axis C71.

An air cylinder ClO4 mounted on the support structure is connected by a piston rod C106 and is located in a position in FIG. 1 parallel to and offset from the drum C70 and in a symmetrical position in FIG. position 98 shown
Move feed conveyor C98 laterally between '.

Referring to FIGS. 3 and 4, the above-mentioned overhead support structure 1
20 includes a bridge 122 carried by a bearing B49 of device B and extending between the bearing and housing A18 of device A.

A pair of parallel rails or bars 124 are rigidly supported by the bridge and parallel to a common axis B41-A15;
Disposed above it provides a track arrangement, on which the band transfer carriage 130 is arranged to move parallel to the band axis A15.

A pair of parallel sliding rods 132 fixed to the transfer carriage 130 support a pair of coaxial band transfer rings 135 concentrically about the band axis A15.

Each ring 135 has an extension 137 with a hole parallel to axis A15 and threaded as a nut, one extension having a right-hand thread and the other extension having a left-hand thread.

Right-handed and left-handed threaded screws 139 are rotatably fixed to carriage 130, each thread thereof engaging a corresponding thread in extension 137, so that when bundle 141 ≧ rotation, the ring is aligned with the axis. , i.e. coaxially slidably adjusted to move away from and toward each other.

Each ring 135 carries a plurality of radially movable plungers 144 spaced angularly about it and projecting radially outwardly and inwardly through the ring.

With particular reference to FIGS. 4 and 5, valley plunger 144
coaxially passes through a cylinder 146, the inner and outer ends of which are each closed by a sealing cap 146, which surrounds the plunger and supports it for radial movement. do.

Each plunger integrally forms a piston 150,
This piston is slidable within each cylinder between the caps.

At the radially outer end of each cylinder, air holes 152
communicates with compressed air from a supply conduit 154 connected to a conventional pneumatic source system via a manual valve (not shown).

At the radially inner end of the cylinder, a hole 156 connects the cylinder to a suction conduit 158, which is connected to a vacuum pump via a manual valve (not shown).

Each plunger 144 has a longitudinal bore 161 extending outwardly from the radially inner end of the cylinder, which bore 161 opens into the cylinder radially inwardly of the piston 150 by a transverse bore 163 and thus partially Vacuum is in communication with the cylinder 146 via bore 156 and with longitudinal bore 161 via transverse bore 163.

A flexible hollow pad or cup 165 that engages the outer surface of the band is secured to the radially inner end of each plunger 144.

The band is supported against the pad 165 by reducing the air pressure within the pad and longitudinal holes 161 to below atmospheric pressure.

A compression coil spring 167, which contacts the radially outwardly extending portion of the plunger 144, acts between an outer packing retainer cap 148 and a conventional adjustable stop collar 169 to force the plunger radially outwardly. pressing and alternatively restricting the radial inward movement of the plunger under the influence of air pressure acting on the piston 150.

Carriage 130, ring 135 and associated members form a band transport device which moves carcass forming drum B40 from the timing position shown in FIG. 3 to the right to a position concentric with drum A12 and to the left. It is possible to move along the track device to the left to a position concentric with .

As used herein, the term "concentric" means not only radially concentric with respect to the axis of the drum, but also symmetrical with respect to the central circumference of the drum.

At this time, the band transfer device is spaced apart from both the band forming drum A12 and the mechanism B65, so that the completed band can be placed inside the band transfer device without interfering with the drum or mechanism. It is particularly noteworthy that .

The advantages of this feature are further explained below.

Referring to FIGS. 2 and 6, overhead support structure 120 includes a bridge 172 that connects device B to device C.
The bearing B49 is connected to the housing C72 and the bearing B49, and is supported by these.

A pair of rails 174 (best shown in FIG. 7) are secured to bridge 172 and extend f above and parallel to belt axis C71.

The drum B40 and its rotational axis B41 are at the above-mentioned position B-2.
, the axis B41 is on a straight line with the axis C71 and may be referred to as a common axis B41-C71.

The belt transfer carriage 176 is slidably supported on the rail 174, and moves from the timing position shown in FIG. 6 to a position coaxial with the belt forming drum C70 to the right in FIG. and move to the left to a position co-centered with the drum B40 and the tire carcass.

In the position shown in FIG. 6, the belt transport device and the completed belt carried thereon are sufficiently axially spaced from drums C70 and B2O so as not to interfere with their operation.

Referring also to FIG. 7, a plurality of segments 18 are movable in the radial direction of the belt axis C71 (coaxial with the belt axis).
A rigid ring 180 that supports 2 is attached to the per-second carriage 176.

Segments 182 are moved by a mechanism including an actuation ring 184 supported by ring 180 and coaxially rotated in response to actuation E of air cylinder 186 to move segments 182 inwardly and outwardly with respect to axis C71. Move the direction.

The aperture mechanism shown in FIG. 7 is well known and is outside the scope of the present invention.

To ensure that the belts and transfer devices are parallel and symmetrical about the central circumferential surfaces C80, C60, a conventional shot pin mechanism C190 is placed on the floor or substrate directly below the drum C70, and the same shot pin mechanism The lower part of B40 is located within the central peripheral surface A30 or B50, respectively, and in the vertical plane of the common axis B41-071.

Each shot pin has a recess 192 formed in ring 180.
can be engaged with.

8 and 9, the band forming drum A12 according to the present invention takes two alternative forms as shown in FIGS. 8 and 9.

The drum A 12a includes a plurality of radially movable segments A195 about the axis A15.

The segments each have links A1 connecting each segment to the central shaft A199 of the drum in a known manner.
97r is moved in the radial direction.

As the segments are moved inward, the band-forming surfaces provided by the segments separate from the band and the band is retained in the band transfer ring 135.

The banding drum A12b shown in FIGS. 9 and 10 has a banding surface provided by an integral rigid cylindrical shell A202, which cylindrical shells are arranged axially in columns and circumferentially in rows. Many small orifices A204
has.

The orifices are provided by hollow rivets E, and a number of distribution tubes A206 are attached by the rivets to the inner surface A208 of the cylindrical shell, which distribution tubes are connected on the one hand to a compressed air manifold A210 in the form of an endless circular tube, The manifold is connected to a suitable air passage in the central shaft A214 by a flexible tubing connector A212.

Upon completion, the endless tire band is removed from the surface of drum A12b by blowing pressurized air between the inner surface of the band and the outer surface of drum A12b.

Small changes in radial dimension caused by blowing air pressure do not distort the band appreciably, allowing the band to be removed by the band transport mechanism without having to collapse the band-forming drum as in drum A 12 a.

The operation of the device described above begins with the cylindrical surface A13 of the band forming drum fixed at a diameter E corresponding to the required inner diameter of the band, for example 15 to 25 factors larger than the bead diameter of the tire to be formed. be done.

One or several elements providing bead chafers are wrapped around drum A12 at appropriate axial locations.

The extendable part of liner conveyor A2G is drum A12
The liner material is moved close to the drum f to dispense a continuous liner material, which is wrapped around the drum f one or several times to form an endless carcass liner.

Liner conveyor A20 separates from drum A12 and moves to the second
A conveyor portion A26 extends toward the drum A12 to dispense a series of cord ply material that is wrapped around the drum and spliced to form an endless ply band.

A second ply is similarly wrapped.

Although the plies used may be made of any cord reinforcing material and the cords may be placed at any suitable angle relative to the length of the ply material, in the method and apparatus described herein the plies may be oriented at any suitable angle relative to the longitudinal direction of the ply material; A15 includes metal cables arranged at least substantially parallel to A15 to form the plies of the radial tire.

Optionally, additional elements may be wrapped around the first ply to provide reinforcement.

The formed band is then sewn in the usual manner by a stitching mechanism (not shown).

After completion of the band, the band transfer ring 135 is moved coaxially with the right drum A12 from the initial position shown in FIG. 3 until it reaches a position coaxial with the drum, ie, a concentric position.

Co-centered means that the pair of rings 135 are both coaxial with the drum and symmetrically located with respect to the band's central station 11A30.

The radial plunger 144 moves radially inward to bring the pad 165 into surface contact with the band, which is still firmly supported against the drum surface Al3G.

Adjustable stop collars 169 on each plunger ensure that the pads are positioned so that they do not alter the radial dimensions of the band.

The hollow pad is then connected to a vacuum conduit 158, which temporarily secures the band to the pad and holds it radially immobile.

Once the band engages the pad as described above, the band is then separated from the drum surface.

This separation is determined by each of the plurality of segments A195 (eighth
(Fig.) radially inwardly relative to the band-forming surface.

According to the above description of this device, the drum surface has a number of orifices A204 (FIG. 9), through which pressurized air flows between the band forming surface and the inner peripheral surface of the band. blown in between.

The radial dimensional change in the band due to the presence of the air film between the band and the drum surface is not significant.

When the band is removed from the drum surface by one of the methods described above, the transfer ring 135 moves coaxially to the left as viewed in FIG. 3, placing the transfer device and band in a standby position.

According to the present invention, the tire belt is formed simultaneously with the formation of the band as described above.

The advantages in economy and efficiency are evident in that the capacity of the equipment is better utilized.

As noted above, the belt forming operation, which includes a tread as part of an assembly referred to as a belt, involves the formation of a drum C to a diameter that corresponds to the desired crown diameter of the formed carcass.
It is started by setting 70.

Next, the belt ply feeder C75 is moved to a position in alignment with the central circumferential surface 80r and is energized to feed the first belt ply element, which elements are wrapped around the drum (wound and normally spliced in a way.

The feeding device then feeds the second belt ply element and, if used, the third belt ply element, additional belt ply elements one after the other, each belt ply element being spliced in the usual manner. , the combined belt is then connected to a conventional stapling mechanism (not shown).
Sewn by.

Next, the belt ply feeder is moved to a position angled relative to the central circumferential surface C80.

The tire tread in the form of extruded slabs of rubber or rubber-like material held in standby on tread storage conveyor C97 is now advanced to tread supply conveyor C98, which then moves laterally to the center circumference. Surface 80
Consistent with

From the supply conveyor, the tread is advanced to drum C70, wrapped around a band on the drum and seamed in the conventional manner, with the tread and belt assembly being sewn together by a stitching mechanism.

Again, tread supply conveyor C98 moves axially laterally with respect to drum C70 to transfer tread storage conveyor C.
97 and wait to pick up the tread for the next tire.

Belt transfer ring 180, whose segments have been moved radially outward, is then moved from the standby position shown in FIG. 6 to a cocentric or concentric position with respect to drum 070.

Concentric, as used herein, means that the rings are moved one turn to a symmetrical position with respect to the central circumferential surface C80.

The ring segments 182 then move inwardly to approach the circumferential surface formed by the inner surfaces of the segments and snugly engage the belt and tread assembly.

While the belt is held firmly against ring segment H, segment C 74 is moved radially inwardly relative to the belt forming surface, and transfer ring 180 is then moved to the left E as viewed in FIG. It is moved to the standby position.

Preferably, according to the invention, carcass forming drum B4
The operations related to the 0 are carried out at the same time as the aforementioned operations for forming the bands and belts.

The preformed tire is removed from the crushed drum B40 for removal at location B-3, where a non-stretchable bead assembly, referred to as a bead, is placed in the bead installation apparatus of mechanisms B63, B65 and the drum is removed from the drum B40 for removal. B40 swings into a coaxial relationship with band axis A15 and locks therein.

Next, the band transfer ring 135 is located on the left side (as seen in Figure 3).
This is moved to a position co-centered with the drum B40.

Once perfect axial alignment is achieved and there is no relative axial movement between the band and the drum, the drum B40 is forced apart into a second condition, with the band coaxially engaged;
For example, about 0.1 to 5 inches of diameter may be slightly expanded.

The plunger 144 is thereby free to move outward, the air pressure acting on the piston 150f and the vacuum connection to the pad 165 are valved off, and the band is secured on the drum.

The band transfer ring is returned to its standby position. Shuttle B67
, and sweeping and bead placement carried by the carriage;
The folding mechanism B65 is moved from the standby position 67' of FIG. 2 to the operative position of FIG. 1 in coaxial alignment with the drum B40 and hence in supporting relationship with the drum B40.

Mechanisms B63 and B65 are advanced in unison, and the sweeping fingers surrounding the ply ends are moved radially inward, placing each bead in concentric engagement with the outer surface of the band.

The fingers are then retracted and the ply ends are folded radially outwardly to wrap around the beads and securely stitch the ply ends to the ply extending between the beads.

The sweeping, bead setting, and folding mechanism is then moved axially away from the drum, and mechanism B65 remains in a coaxial support relationship with the drum.

The necessary additional elements, such as lower sidewall pieces and/or shoulder wedges, are wrapped circumferentially around the carcass formed at this stage.

After the cylindrical carcass is completed, mechanism B65 and carriage B
67 is returned to the standby position shown in FIG.

Housing B42 is released and drum B40 is moved to its second position.
, that is, its axis of rotation B41 is coaxially aligned with the axis C71 of the belt forming drum.

Preferably, drum B40 is actuated to move the carcass about vertical axis B50 by fluid pressure entering sleeve B52 axially moving the intervening beads toward each other causing the sleeve to radially expand. At the same time as this angular movement begins to shape the carcass.

Next, the drum B40 is automatically locked into a coaxial relationship with the belt axis C71.

The belt transfer ring 180 with the belt therein is moved from its standby position to a position concentric with the carcass forming drum B40 and brought into full t-alignment with relative axes before contact occurs between the carcass and the belt. E is brought in to make sure it stops.

The formation of the carcass continues, its radial expansion simultaneously engaging the belt of the crown of the carcass along the central circumference.

Segment 182 is then moved radially outward;
Rolling free off the tread, the transfer ring 180 is moved to the right as viewed in FIG. 6 to the standby position.

The belt and tread are sewn in the usual way, and the belt is joined to the carcass.

At this stage, any necessary additional elements are applied, such as the sidewall pieces that cover the tread in the shoulder area.

After the tire is completed, turret B42 is released and swung approximately 45 DEG to position B-3 as shown in FIG. 2, simultaneously crushing the drum and releasing the tire.

The tire is then removed and ready for further operations, including curing.

From the foregoing, it can be seen that the apparatus and method of the present invention can be utilized by three cooperating tire forming machines, each tire forming machine performing part of the work associated with a band forming drum, a belt forming drum, and a carcass forming drum, respectively. It is clear that

The operation can also be carried out by two tire building machines, each tire building machine performing a part of the work associated with one of the two working axes, namely the band forming axis C71 and the belt forming axis A15.

The relative flexibility of the operation is particularly advantageous in that the finished band can be held in a waiting position by the transfer device, allowing other operations, including the formation of the second band, to proceed without interference. Benefits can be obtained.

The same applies to the belt forming operation, where the belt and tread assembly can be held in a standby position of the belt transfer device without interfering with the formation of the second belt or the operation of the carcass forming drum. .

Although several representative embodiments and details thereof have been shown for the purpose of illustrating the invention, various changes and modifications may be made without departing from the spirit or scope of the invention. It's obvious that it's house E.

[Brief explanation of the drawing]

1 and 2 are plan views schematically illustrating a preferred apparatus according to the present invention; FIG. 3 is a schematic side elevational view of the apparatus of FIGS. 1 and 2 as indicated by line 3--3; Figure 4 is a sectional view taken along line 4-4E in Figure 3, Figure 5 is an enlarged view taken along line 5-5 in Figure 4, and Figure 6 is a cross-sectional view taken along line 6-6 in Figure 2. Schematic side elevation view, FIG. 7 taken along line 7--7 of FIG.
8 and 9 are cross-sectional views of a portion of the apparatus of FIGS. 1 and 2, and FIGS. 8 and 9 are alternative configurations of the band-forming drum of the apparatus of FIGS. 1 and 2 taken along line 4--4f of FIG. and FIG. 10 is a cross-sectional view of an enlarged portion of the drum of FIG. 9. In the figure, A12...Band forming drum, A
13...Cylindrical surface, A15...Axis, B2O...Carcass forming drum, B41...
...Axis line, B42...Housing, B44
...Turntable, B-50...Axis, B-1, B-2...Position, C-70...
... Belt forming drum, C-71 ... Axis line,
C-73... Cylindrical surface, 124, 174...
...Rail, 130...Band transfer carriage, 176...Belt transfer carriage, B63...
...Bead sweeping, bead installation and bead folding mechanism.

Claims (1)

[Scope of Claims] 1. Before changing the radius of an integral cylindrical endless band made on a first cylindrical surface A13 having a circumference larger than the circumference of a bead ring of a pneumatic tire, and before bringing the endless band into contact with the expandable carcass-forming drum B4G, the endless band is translated from the first cylindrical surface A13 in the same direction as its axis A15 and centered around the carcass-forming drum B40. arranging the endless band so that the carcass forming drum B40 is placed around a vertical axis B50;
is rotated so that the endless band on the first cylindrical surface A13 and the integral inextensible cylindrical endless belt made on the second cylindrical surface C73 alternately share the axis. a second cylindrical surface C73 before changing the radius of the endless belt and before bringing it into contact with a tire carcass made on the surface of the carcass forming drum B40;
The endless belt is translated in the same direction as its axis C71 to form the tire carcass and the carcass forming drum B.
a step of arranging an endless belt so as to be centered around the tire carcass; and a step of expanding the carcass forming drum in a radial direction to join the endless belt and the tire carcass. Production method. 2 Translatably mounted on a first track device 124 extending parallel to the rotational axis A15 of the drum at a first position B-1 of the carcass forming drum B40, and the carcass forming drum B40 is at the first position; A band transfer device 13 that can be moved between a position centered around the band forming device A-12 and a position centered around the carcass forming drum B40 while in the band forming drum B-1.
0, and a first device B4 equipped with a carcass forming drum B40.
2 of the carcass forming drum B40, and a turret device B44 mounted to swing around a vertical axis B50 between the first position Bl and the second position B-2 of the carcass forming drum B40; while the carcass forming drum B40 is in its second position B-2; A tire manufacturing device including a belt and a belt transfer device 176 (!:,) capable of moving between a position co-centered around the belt and belt-forming device C70 and a position co-centered around the carcass-forming drum B40. .