JPS5929419B2 - Device for inserting the bladder of a tire vulcanization mold into the raw tire carcass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates generally to an apparatus for accurately positioning and snugly fitting together an uncured tire carcass and a tire curing bladder in a vulcanized mold, and more particularly, The present invention relates to an apparatus for installing an at least partially annularly preformed uncured tire carcass (e.g. a radial ply carcass) prior to installation in a carcass.

The present invention is an apparatus for placing a partially annular preformed uncured tire carcass around a tire curing bladder, the apparatus comprising: a partially annular preformed uncured tire carcass; Axial tire curing bladder
are connected to each other, the bladder is expandable and expandable in the axial and radial directions, and when the bladder is in a cylindrical state extended axially more than the carcass, the bladder is concentrically , about which a generally annular preformed uncured tire is placed by a tire carcass transporter, and a bladder control device is supported on the tire carcass transporter, the tire carcass transporter supporting the bladder control device. The device pushes the upper end of the bladder toward the lower mold half section to fit the core bladder into the tire carcass, thereby causing the bladder to form a substantially circular ring complementary to the tire carcass. The device is shaped and thus ready for the next tire carcass curing process.

The invention will be more clearly understood from the detailed description that follows in conjunction with the accompanying drawings.

As shown in the drawings, particularly in FIG.
A wire carcass transporter or chuck is provided which generally points at 0.

The chucks 10 are arranged in a circular manner in the circumferential direction.

It comprises a series of identically shaped, equally spaced segments 12 which are curved in horizontal cross-section at their lower ends to form a lip 13, which is connected to the bead of the tire carcass 16 as shown in FIG. Grab 14.

Each segment 12 has vertical stabilizing ribs 18.

This rib extends from the bead engagement flange 20 at the bottom.
Extending vertically to a cam sensing follower housing 22 fixed to segment 12.

Each housing 22 is radially movable along a respective guide bar 24 provided radially therethrough.

Guide bar 24 is cantilevered to central support 26 as seen in FIG.

To facilitate movement of the housing 22 along each bar 24, each housing is provided with an upper roller and a lower roller (of which only the lower roller 28 is shown in the drawings) to accommodate the bar. ).

Also mounted to the central support 26 is a cam plate 30.

The cam plate includes one spiral slot 32 for each housing 22, into which is engaged a follower pin 34 (FIG. 2) mounted in the housing.

The cam plate 30 is rotatable relative to the central support 26 and is driven, for example, via a crank 36 by a power plant, a portion of which is indicated at 38.

A power cylinder or jack unit 40 is mounted to the central support 26 concentrically within the circle of circumferentially arranged segments 12, as shown in dashed lines in FIG. 1 and in solid lines in FIG.

The jack unit 40 includes a telescopic piston rod 42.

The free end of this slot is axially engageable with the free end 44 of a piston rod 46 provided in the lower half section 48 of the tire carcass cure mold.

(Although the upper half section of the mold is not shown, it goes without saying that it is shaped to complement the lower half section, as is well known.

) The jacking unit 40 may be a "single-acting" type that can only extend the piston rod 42, or a "single-acting" type that can only extend and retract (extend and retract) the piston rod 42.
A double-acting type may also be used.

As shown in FIG. 2, the lower half section 48 has a semicircular annular recess 50 formed within the annular section 52. As shown in FIG.

A sleeve 56 extends through the central opening 54 of the section 52.

The sleeve is secured to section 52 in a known manner, for example as shown at 58.

One end of the tube 60 is fixed inside the sleeve 56;
The other end of this is coupled to a power cylinder or jack (not shown).

A piston rod 46 of the jack extends movably within tube 60.

The jack controlling the piston rod 46 only drives the rod 46 to protrude, not to retract.

In other words, this jack is a "single-acting" jack,
It is not a "double-acting" jack that extends and retracts the piston rod 46.

A plate 62 is attached to the upper end 44 of the piston rod 46.

At the periphery of the plate 62, a circular edge 64 of a well-known cylindrical bladder 66 used for curing tire carcass is fixed in a gas-tight manner.

The other circular edge 68 of bladder 66 is hermetically attached to sleeve 56 in a well known manner.

One or more channels 70 within sleeve 56
is formed, and one end of this channel is connected to the bladder 6.
6, and the other end is connected to a conduit 72 for supplying, for example, pressurized steam to and from the bladder 66 for vulcanizing the carcass.

In operation, the tire carcass transporter or chuck 10 is initially separated from the lower mold half section 48 and out of axial alignment.

The segments 12 of the chuck 10 are then moved inwardly by the cam plate 30 to reduce the diameter of the circular array to a size that fits within the bead 14 of the pneumatic tire carcass, such as the carcass 16.

Cam plate 30 is then rotated to increase the diameter of the circular array of segments 12.

The lower lips 13 of those segments are then connected to the carcass 1.
6. Appropriately grip and hold the bead 14 of No.6.

The chuck 10 is then lifted by well-known equipment, not shown, and appropriately moved into axial alignment with the lower mold half-section 48.

FIG. 2 shows this state. At this point, the piston rod 46 is extended so that the cylindrical shape of the bladder 66 is ready to fit into the lower bead 14A of the carcass 16, whereupon the carcass 16 is lowered by the chuck 10 into the bladder. Can be fitted around.

In order to facilitate the movement of the carcass onto the bladder, the pressure in the bladder is slightly lowered and its wall is slightly recessed towards the inner piston rod 46.

Such low pressure may be created by suitable devices via channel 70 and conduit γ2, or by other suitable known devices not shown.

Chuck 10 is lowered as shown in FIG. 3 so that lower bead 14A of carcass 16 engages section 52 of lower mold half section 48.

The underpressure within the bladder 66 is then turned off and pressurized steam is delivered into the bladder.

The piston rod 42 of the jack 40 of the chuck 10 is then extended and axially engages and retracts the piston rod 46 of the bladder 66.

As the piston rod 46 is retracted, the bladder 66 containing the pressurized steam gradually conforms to the shape of the inner surface of the carcass 16, so that the bladder also assumes an annular shape.

The gradual isomorphism of the bladder to the inner surface of the carcass
They are shown in sequence in Figure 6.

Although not shown, a mold upper half section of well-known design is lowered onto the lower half section 48 to assist in deforming the bladder 66 and carcass 16 to the final toroidal shape for vulcanization thereof. form.

Of course, the chuck 10 is the mold lower half section 48
is pulled up from its lower half section before being closed with its upper half section.

A feature of the present invention is that a jack 40 and its telescopic piston are included in the circularly arranged segments 12 of the chuck 10.
The configuration includes a rod 42.

Rod 42 thus axially engages piston rod 46 of the lower mold half section, causing rod 46 to retract without being driven by a jack (not shown) driving it.

Therefore, the main actuator (piston rod 42) which makes the bladder 66 conform to the inner surface of the carcass 16 is the bladder 66.
Since the main actuator is isolated from the inside of the bladder, the driving liquid or gas medium of the main actuator will not leak into the bladder.
Such a medium then ensures that the steam fed into the bladder is free from interference in order to effect a homogeneous vulcanization of the carcass 16.

This causes both the extension and retraction of the piston rod 46 (
It is a "double-acting" jack that can extend and retract, distinguishing it from conventional arrangements for driving such rods.

When using such conventional jacks, the hydraulic medium (usually water) used is the piston rod 46.
flow along the bladder when this rod is retracted.
66.

According to the present invention, such intrusion is avoided because the retraction drive of the piston rod 46 is effected by the protrusion actuation of the piston rod 42, which is isolated from this rod and from the bladder 66.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a tire carcass transporter equipped with the bladder control device of the present invention; FIG. FIG. 3 is a partial cross-sectional elevation view showing a half section and the tire carcass transporter of FIG. 1 gripping a partially annularly preformed uncured tire carcass, FIGS. FIG. 6 is a cross-sectional view of the portion of the apparatus of FIG. 2 showing the successive positions of the tire carcass transporter relative to the lower half section of the mold during the process of positioning the tire carcass around the bladder and over the lower half section of the mold; shows. 10... Tire carcass chuck, 12.
...Same segment, 13...Lip, 1
4...Bead, 16...Tire carcass, 18...Reinforcement rib, 22...Cam driven housing, 24...Guide bar , 26・
...Central support, 28...Roller, 30.
...Cam play 1-132...Cam slot, 34...Followed pin, 38...
Power plant, 40... Jacket, 42.46...
- Piston rod, 48 - Lower half section of mold, 50 Recess, 52...
Weekly section, 62... Plate, 66...
... Bladder 164, 68 ... Same edge, 7
0...channel, 72...conduit.

Claims (1)

[Scope of Claims] 1. A chuck device 10 removably grips the vinyl 14 of a preformed partially annular carcass 16, and the chuck device includes a plurality of chucking devices arranged circularly at equal intervals in the circumferential direction. a vulcanization mold, comprising a plurality of identical segments 12 and a control device 22,30 for selectively increasing and decreasing the effective diameter of the circular array of segments to engage and disengage the segments from the carker speed. a pneumatic tire cure mold bladder configured such that section 48 provides the carcass with a final toroidal shape and includes an inflatable cure bladder that can assume both cylindrical and toroidal shapes; Preformed partially annular green tire: in a device for insertion into the carcass 16, the mold section having a free end portion concentric with and axially movable relative to the center thereof; The piston rod 46 has a circular plate member 62 concentrically fixed to the free end portion thereof, one circular edge 64 of the bladder being connected to the plate member 62. the other circular edge 68 is also hermetically secured to the mold section 56;
The bladder surrounds the piston rod 46, and a power cylinder arrangement 40 is mounted concentrically to the chuck arrangement in the segmented circular arrangement, the dynamic cylinder arrangement having an extendable and retractable piston rod 42. , the free end of the piston rod is axially engageable with the free end portion of the piston rod 46 associated with the bladder, thereby causing the rod 46 to be retracted and the bladder cylindrical. An apparatus characterized in that the device is configured to gradually transform the inner surface of the carcass from a shape to an annular shape. 2. The apparatus of claim 1, wherein the chuck device controller comprises a rotating portion 30 having an associated cam slot 32 for selectively moving each segment.
A device characterized by comprising: 3. The device of claim 1 or 2, wherein the chuck device comprises a radially arranged cantilevered member 24, each segment having a fixed housing member 22 at one end thereof; Apparatus characterized in that the housing loosely surrounds and is movable relative to each cantilevered member. 4. The apparatus of claim 3, wherein each said housing includes a follower member 34 operatively associated with each respective said cam slot. 5. In the device of claim 1, the power cylinder device 40 is mounted on the chuck device such that the piston rod thereof is concentric with the carcass bead gripped by the segment. A device characterized by: 6. In the device of claim 1, the stroke of the piston rod 42 of the power cylinder device is sufficient to transform the bladder from a cylindrical shape to an annular shape that is exactly the same as the inner surface shape of the carcass. Apparatus characterized in that the stroke is sufficient to retract the piston rod 46 of the mold section over the axial range of deformation. 7. The device according to claim 1, wherein the power cylinder device is pneumatically operated. 8. The device of claim 1, wherein the power cylinder device is hydraulically actuated. 9. In the device according to claim 1, the bladder
A device characterized by the creation of low pressure inside. The apparatus according to claim 1, wherein the power cylinder apparatus is a single-acting jack 40. 11. The device according to claim 1, wherein the power cylinder device is a double-acting jack 40.