Apparatus for manufacturing tires with white sidewall appliques.

Abstract: A product and process for imparting decorative appliques to the sidewalls of tires during the curing operation are presented. In one embodiment, a spool (76) of applique composite material is maintained for feeding into a tire mold (70) or onto a transfer device, thereby defining a ring for vulcanization to a tire. The applique consists of a laminate received upon a carrier, the laminate having a first barrier layer (54) and a congruent second decorative layer (56). The laminate is received by a tire sidewall (64) between two grooves (66)(68) which serve to isolate the decorative layer from the tire itself. In another embodiment a laminate of white and barrier rubber stock is formed and then configured into a cylinder. A plurality of bands are cut from the cylinder then transferred to a fixture by reorienting the bands to conform to the angle of the sidewall of the tire at the point with which the band is to be adhered. The band is then transferred to a tire curing press which subsequently receives a green tire, with the band and tire being simultaneously cured, achieving a bond of the band to the tire by vulcanization.

Description: The invention relates to an apparatus for applying a white sidewall applique to a tire, comprising (a) forming and cutting means for forming and cutting individual uncured bands of a layer of barrier rubber compound and a layer of white rubber compound; and (b) transferring means for transferring said individual uncured bands from said forming and cutting means to a tire curing press. More generally, the invention herein resides in the art of the manufacture of pneumatic tires and, more particularly, to the manufacture of such tires having white sidewalls. Specifically, the invention relates to a method and apparatus for manufacturing and applying white sidewall appliques to a tire during the tire curing process. BACKGROUND ART The manufacture of tires is significantly complicated by the imparting of decorative bands into a tire sidewall to form a "white sidewall" tire. Presently, this is accomplished by fabrications using the extrusion and calendering of a number of black and white components which are subsequently combined into a decorative sidewall preassembly. All of the tire components, including the tire sidewall preassembly, are then applied in sequence to the tire building drum to form the green or uncured tire. Following the tire curing operation, the decorative sidewall side of the tire is carefully ground and buffed to expose the decorative sidewall area which was previously protected by a cover strip. These complex steps detrimentally effect the efficiency of the tire manufacturing process. Further, many interfaces produced in construction of the decorative sidewall tire effect the structural integrity of the tire and its durability and performance on the road. It is generally known in the tire industry that the tire carcasses used for forming a blackwall tire are different from those employed in manufacturing tires having decorative features or "white sidewalls" thereon. Further, modern tires are designed with increasingly thinner sidewalls, such that the decorative portion of the sidewall is becoming an increasingly significant part of the tire sidewall structure itself. Since the decorative portion is typically less than optimum as a structural element, it is becoming increasingly difficult to manufacture modern tires having sidewalls with decorative features thereon. Previously known tires with decorative sidewalls have been characterized by a plurality of boundaries defining the different layers of the decorative structure, each boundary presenting an area for the development of a potential defect. To obviate the shortcomings of the prior art, it has been proposed to replace the previously known sidewall decorative features with appliques of polymeric paint applied to stock blackwall tires after the curing operation on the tire. Such structures and techniques are taught in US-A-4 767 481, US-A-4 684 420, US-A-4 699 193 and US-A-4 684 431, all assigned to Bridgestone/ Firestone, Inc. The appliques of these patents are quite thin, on the order of 0.0735 mm (0.003 inch) and, accordingly, susceptible to damage by scrapping, scuffing, and the like. While the appliques are designed to be scuff resistant, and the tire receiving such appliques is configured to protect the same from scuffing, the inherent thin nature of the appliques gives rise to concern over damage resulting from use. In the past, some attempts have been made to manufacture elastomeric appliques for use in the manufacture of whitewall tires. However, such prior techniques have proven to be time consuming and costly. Previously, single rings of an elastomeric material have been extruded upon a carrier for placement in a tire mold and for transfer by vulcanization to the tire during the curing operation. However, these prior attempts have not demonstrated an ability to be cost effective and reliable. Accordingly, there is a need for an automated method of producing whitewall appliques for vulcanization to a tire during the curing operation. Furthermore, an apparatus of the type mentioned in the preamble of claim 1 is known from EP-A-0 350 024. Although the apparatus according to EP-A-0 350 024 is indeed favourable for applying a white sidewall applique, it requires for each sidewall applique the unwinding and cutting of a certain length of band from a spool of such band and connecting the ends of each one of such bands for making an annulus which is then transferred directly to the tire or to the tire curing press. DISCLOSURE OF INVENTION In the light of the foregoing, it is a first aspect of the invention to provide an apparatus for applying white sidewall appliques to a tire, which is cost effective and automated. Another aspect of the invention to provide an apparatus for applying a white sidewall applique to a tire for providing a tire having a decorative applique and for carrying out a process for making the same in which a blackwall tire may be selectively employed. Yet another aspect of the invention is the provision of an apparatus for applying a white sidewall applique to a tire including means for manufacturing white sidewall appliques which is given to mass production. Yet a further aspect of the invention is the provision of an apparatus for applying a white sidewall applique to a tire including means for manufacturing white sidewall appliques which allows for the bonding of the applique to the tire by vulcanization during the tire curing process, and in which the formation of the applique and transfer thereof to the tire curing mold is achieved in an automated fashion. Another aspect of the invention is the provision of an apparatus for applying a white sidewall applique to a tire for providing a tire having a decorative applique and for carrying out the process for making the same in which such process is a simple one, eliminating the steps and material previously used for co-extruding and assembling a sidewall band or decorative material. Still a further aspect of the invention is the provision of an apparatus for applying a white sidewall applique to a tire for providing a tire having a decorative applique and for carrying out the process for making the same in which little or no waste is experienced in the manufacturing process. An additional aspect of the invention is the provision of an apparatus for applying a white sidewall applique to a tire for providing a tire having a decorative applique and for carrying out the process for making the same which is given to numerous and varying designs, colors, configurations, and the like. Another aspect of the invention is the provision of an apparatus for applying a white sidewall applique to a tire for providing a tire having a decorative applique and for carrying out the process for making the same in which tire integrity is enhanced by reduction of the number of components comprising the decorative portion. Yet a further aspect of the invention is the provision of an apparatus for applying a white sidewall applique to a tire for providing a tire having a decorative applique and for carrying out the process for making the same in which the sidewall construction is uniform, with no interruptions or changes of materials or modulus therein. Still a further aspect of the invention is the provision of an apparatus for applying a white sidewall applique to a tire for providing a tire having a decorative applique and for carrying out the process for making the same in which the applique is actually cured or vulcanized to the tire. The foregoing and other aspects of the invention which will become apparent as the detailed description proceeds are achieved by an apparatus of the type mentioned in the preamble of claim 1 which is characterized by further comprising: (A) means for mixing and calendering said layer of barrier rubber compound; (B) means for mixing and calendering said layer of white rubber compound; and (C) a laminator for receiving said layers of barrier and white rubber compounds and laminating said layers together, forming an uncured laminate; said forming and cutting means being adapted to form a cylinder of said laminate and to cut said cylinder into a plurality of said uncured bands; and said transferring means comprising: (1) a storage cylinger for receiving and maintaining said bands; (2) a fixture adapted to be positioned at an end of said storage cylinder, to receive bands from said storage cylinder and to form said white sidewall applique; and (3) intermediate transfer means for urging a band from said storage cylinder and onto said fixture, said intermediate transfer means reorienting said band by deflecting said band through an area of at least 90° while maintaining said band about a fixed axis. DESCRIPTION OF DRAWINGS For a complete understanding of the objects, techniques and structure of the invention reference should be made to the following detailed description and accompanying drawings wherein: Fig. 1 is a cross sectional view of an applique ribbon according to the invention; Fig. 2 is a partial cross sectional view of a tire sidewall shown receiving the applique of Fig. 1; Fig. 3 is a diagram of an embodiment of the apparatus according to the invention with associated means; Fig. 4 is a perspective view of the storage cylinder and cutter assembly employed in the embodiment of Fig. 3; Fig. 5 is a perspective view of the apparatus for transferring cut bands from the device of Fig. 4 to a storage cylinder; Fig. 6 is a perspective view of the storage cylinder receiving the bands from the structure of Fig. 5; Fig. 7 is a partial cross sectional view of the storage cylinder of Fig. 6, taken along the line 12-12; Fig. 8 is a perspective view of a white sidewall forming fixture according to the invention; Fig. 9A-9C are partial cross sectional views of alternate forming fixtures according to the invention; Fig. 9D is a partial cross sectional view of a forming fixture according to the invention which employs a roller for urging the bands into a fixture groove; Figs. 10A-10C are illustrative views of the white sidewall forming and transfer mechanism for depositing a white sidewall applique in a tire curing mold; Fig. 11 is a partial sectional view of a tire curing mold showing an angled annular groove for receiving the white sidewall applique; and Fig. 12 is a perspective view of a storage roll, slide ring, and forming fixture according to an embodiment of the invention. BEST MODE FOR CARRYING OUT THE INVENTION The invention contemplates the utilization of a ribbon of applique material which may be either laid directly into a tire mold or, alternatively, be formed upon a transfer ring or device for subsequent placement into the mold. Fig. 1 presents a cross-sectional view of such an applique ribbon or tape 50. As shown, the ribbon 50 includes a carrier or release liner 52 which receives thereupon a barrier layer 54 which, in turn, receives a white or decorative outer layer 56. In a preferred embodiment of the invention, the release liner 52 is a thin polymeric film having a thickness of 0.0254-0.1016 mm (0.001-0.004 inch) and, most preferably, 0.0508 mm (0.002 inch). The barrier layer 54 is provided to prevent the transfer therethrough of antioxidants and/or other staining or discoloring pigments in tire sidewall stocks. This barrier layer is preferably comprised of chlorobutyl-containing rubber compounds or any halobutyl-containing rubber stock. It has also been found that vinyl alcohol copolymers and epichlorhydrin copolymers may serve the desired purpose. While it has previously been known to use these materials as an air or oxygen barrier, it has not been known to use the same for a barrier for antioxidants, antiozonants or other rubber additives. Finally, the white or decorative outer layer 56 is preferably a conventional white sidewall composite such as a mix of EPDM and chlorobutyl rubber or zinc methacrylate based composite. It is most preferred that the combination of the layers 54, 56 are uncured or only partially cured to a degree necessary to facilitate handling. This uncured or partially cured state allows for ease of vulcanization bonding to the tire during the curing process as will be discussed hereinafter. The barrier layer 54 and decorative layer 56 are preferably of the same width, and it is further desired that the carrier release liner 52 is also of such width. In other words, the liner and layers 52-56 are preferably congruent. In the preferred embodiment, the barrier layer 54 has a thickness of 0.254-1.778 mm (0.01-0.07 inch), and preferably 0.762 mm (0.03 inch). The decorative layer 56 has a thickness of 0.762-2.54 mm (0.03-0.10 inch), and preferably 1.397 mm (0.055 inch). The width of the ribbon 50 and the constituent layers and liner is on the order of 7.62-25.4 mm (0.3-1.0 inch), and preferably 13.97 mm (0.55 inch). As shown in Fig. 2, the ribbon of Fig. 1, having the release liner 52 removed, may be used to form a decorative applique on the sidewall of a tire 58. Preferably, a tire employing this type of applique will include an inner rib 60 positioned on the side of the applique nearest the tire bead, and an outer rib 62 on the side of the applique nearest the tread. A raised land or plateau 64 is maintained between the two ribs and separated therefrom by respective separation grooves 66, 68. These grooves have a width on the order of 0.762-2.54 mm (0.03-0.10 inch), and most preferably, 1.524 mm (0.06 inch). The purpose of these separation grooves is to prevent bleeding from the tire sidewall 58 into the side edges of the decorative layer 56. Accordingly, the decorative layer 56 is protected from the tire on the bottom by the barrier layer 54 and on the sides by the gaps defined by the grooves 66, 68. It will be appreciated that the barrier layer 54 is black rubber and serves to mate with a correspondingly black tire. During the curing operation, any flow of the laminate 54, 56 will be at the interface between the tire 58 and the laminate 54, 56. Flow from the bonding surface between the barrier layer 54 and the land 64 is black in color and therefore undetectable. Accordingly, the decorative surface 56 has a characteristic clean, crisp, and well defined appearance. It will, of course, be appreciated that a tire mold used in accordance with the invention includes a sidewall configuration which forms the grooves 66, 68 and the ribs 60,62, while accommodating the laminate 54,56. It is also contemplated within the invention to form the portion of the sidewall of the tire 58 of a nonstaining black rubber compound formed as an inlay to the sidewall of the tire 58 and constituting substantially that portion shown in Fig. 2. In other words, at least the land 64 and the ribs 60, 62 would be formed of such a nonstaining rubber composition. In such a case, the laminate applique ribbon or tape 50 would be the same as in Fig. 1, but the layer 54 would no longer need to be a barrier layer, but could simply be formed of any suitable nonstaining black rubber compound employed in tire manufacture. The black layer 54 would still serve the purpose of assuring that the decorative layer 56 maintains its characteristic clean, crisp, and well defined appearance as discussed above. Referring now to Fig. 3, it can be seen that a system for manufacturing and applying white sidewall appliques according to an embodiment of the invention is designated generally by the numeral 210. As shown, a white sidewall mixer 212, of the conventional banbury type, is employed to generate an appropriate white sidewall compound having customary anti-oxidants, anti-staining agents, and the like. In like manner, a conventional banbury mixer 214 may be employed to provide a compound of barrier rubber adapted to prevent the transfer of stain from the tire to the white sidewall mix generated by the mixer 212. The compound from the mixer 212 is passed to an appropriate calender 216 from which a layer of white sidewall compound of uniform thickness is calendered or extruded. The thickness of such layer is on the order of 1.016-2.032 mm (40-80 mils), and preferably 1.524 mm (60 mils). Similarly, a layer of barrier compound of uniform thickness is extruded or calendered by means of the calender 218. The layers so extruded will have a thickness on the order of 0.635-1.016 mm (25-40 mils), and preferably 0.889 mm (35 mils). The layers from the calenders 216, 218 are laminated together at the laminator 220, with the laminate being applied to a backing material taken from a spool or roll 222. The backing material 222 may be fabric, paper, or other suitable material having an appropriate release layer or coating thereon. The laminate of white sidewall and barrier compounds, received upon the backing material 222, is taken up by a storage roll 224 where the material is maintained until a need for the same is apparent in the manufacturing process. At such time, a stripping roller 226 removes the backing paper 222 from the laminate, with the backing paper being taken up by the wind-up roll 228. The laminate with white sidewall and barrier stock is then applied to a band forming roll 230 where a length of the laminate sufficient to cover the roll 230 is cut. In the preferred embodiment of the invention, the web of laminate is cut through the thickness thereof on a bias with the ends being mated and "stitched" in standard fashion. Cutting of the laminate on a bias through the thickness thereof increases the size of the mating faces of the laminate at the splice, facilitating the stitching operation. Accordingly, a cylinder of laminate is maintained upon the band forming roll 230, such cylinder then being cut into bands of predetermined width. These bands may be transferred to a band storage cylinder 232 or may remain on the roll 230 which will serve as the storage cylinder. As will become apparent later herein, in the preferred embodiment of the invention each of the bands cut from the laminate cylinder maintained upon the band forming roll 230 has a width approximately equal to, but slightly less than, the width of the white sidewall band to be manufactured upon the tire. A white sidewall forming fixture 234 is maintained in communication with the band storage cylinder 232 and is adapted to receive single bands from the cylinder 232 and to reorient the band from the cylinder 232 to the same orientation that the band will take upon the tire to which it is to be applied. A transfer device 236 then takes the band from the forming fixture 234 and places the same within a tire curing press 238. In standard fashion, the tire curing press 238 is also adapted to receive a green tire 240 and to cure the same under the application of heat and pressure over an appropriate period of time. During such process, the uncured white sidewall laminate and the green tire are vulcanized together such that the white sidewall becomes an integral part of the tire, bonded thereto by the vulcanization process. The cured tire, bearing the white sidewall, is then removed from the curing press 238 and passed to the inflator 242 where it is inflated to determine its suitability for use. With reference now to Fig. 4, a detailed appreciation of the band forming roll 230 may be seen. As presented above, the laminate 244 of white and barrier stock is wrapped about the roll 230, cut on a bias and spliced or stitched to form a cylinder of laminate 244 of uniform thickness about the roll 230. A cutter 246, comprising a plurality of equally spaced rotary blades is brought into contact with the laminate cylinder 244 to cut the same into bands of widths established by the spacing of the blades of the cutter 246. The bands 248 formed thereby have a width approximately equal to that of the desired sidewall band, and a thickness which is uniform throughout the band. As shown in Fig. 5, a vacuum sleeve 250 or other appropriate transfer device is received over the band forming roll 230 and is axially movable with respect thereto. The vacuum sleeve 250 may include a plurality of vacuum rings spaced according to the spacing of the bands 248 upon the roll 230, such that individual rings can engage individual bands. Additionally, the vacuum rings can be separately controlled so that selected bands 248 may be secured and released. In any event, the vacuum sleeve 250 is adapted to retrieve the bands 248 from the roll 230 and to transfer the same to the band storage cylinder 232. As shown in Figs. 6 and 7, the storage cylinder 232 preferably comprises a plurality of spaced circumferential grooves 252 adapted to receive the bands 248 and to maintain the same in axially aligned spaced relationship to each other. Those skilled in the art will appreciate that with appropriate control of vacuum sleeve 250 as to the actuation and release of selected bands 248, coupled with the axial indexing of the sleeve 250 with respect to the band storage cylinder 232, assures the depositing of select bands 248 into uniquely associated grooves 252. As further shown in Fig. 7, each of the bands 248 comprises a barrier layer 254 which is received in the groove 252, and maintained upon a white sidewall layer 256, the face of which is exposed from the groove 252. With continued reference to Fig. 7, it can be seen that a segmented passage 258 is present within the wall of the roll 232 and in communication with a groove 252 at the end of the roll 232. The passage 258 is interrupted periodically by the material of the drum 232 to maintain the integrity thereof. It is contemplated that the segmented passage 258 may encompass approximately 300° of the 360° in the circumference of the drum 232. When it is desired to form white sidewall bands from the bands 248, the band storage cylinder 232 will typically be vertically oriented, with the groove 252 having the passage 258 associated therewith positioned at the bottom thereof. As shown in Fig. 8, a vacuum transfer ring 260 is then received over the cylinder 232. The transfer ring 260 is configured to receive and secure individual bands 248 to move selected bands to the lowermost groove 252 of the cylinder 232 so that the same can then be urged from the bottom groove 252 into a white sidewall forming fixture 262 positioned at the bottom of the cylinder 232. As shown, the fixture 262 is axially aligned with the cylinder 232 and is orthogonal thereto. As shown in Fig. 9A, the fixture 262 is provided with a circular groove 264 centered about the axis of the cylinder 232 and fixture 262. The groove 264 has a width which is slightly greater than the width of the bands 248 and depth which is slightly less than the thickness of the bands 248 such that the cross sectional area of the groove 264 is substantially equal to the cross sectional area of the band 248. Accordingly, the total volume of the groove 264 will be substantially equal to the total volume of the band 248. As further shown, the groove 264 is angled downwardly from the horizontal at an angle of 10° - 15°, corresponding to the curvature of the tire at the point on which the sidewall band is to be applied. In a preferred embodiment of the invention, this angle is on the order of 13°. An extendable rotating finger or spatula 266 is maintained within the cylinder 232 and communicates with the openings 258 in a manner to achieve removal of the band 248 from the lowermost groove 252 and to deposit the same into the groove 264 of the fixture 262. As shown in Fig. 9A, the spatula 266 extends radially through the opening 258 and into the contact with the band 248, urging the same from the groove 252. The spatula 266 is then caused to rotate, causing the band 248 to fold or roll out of the groove 252 and into the groove 264 of the forming fixture 262. It will be appreciated that there may be provided a separate finger or spatula 266 for each of the openings or passages 258, or a single such spatula may be employed, the same being retracted to pass over the webbing of the cylinder 232 which breaks up the passage 258. It should also be noted that the finger or spatula 266 is provided with a curved or radiused edge 268 so as not to damage or mar the band 248. It will be noted that engagement of the spatula 266 is against the barrier stock layer 254. It will further be appreciated that the white sidewall stock 256 is received in contacting engagement with the groove 264, with the barrier stock layer 254 being exposed. Such orientation further serves to protect the white sidewall surface from being marred or damaged. Various other devices and methods may be employed to remove the bands 248 from the storage roll 232 for deposit and formation in the groove 264 of the fixture 262. For example, in Figs. 9A, 9B and 9C, various embodiments are shown in which neither the cylinder 232 nor the fixture 262 rotate, but remain stationary. In Fig. 9A, a plurality of circumferentially uniformly spaced fingers or spatulas communicate through associated openings 258 to urge the bottom most ring 248 from the cylinder 232 and onto the fixture 262. The fingers 266 are hydraulically or pneumatically actuated for extension and retraction. In the embodiment of Fig. 9B, external spatulas or fingers 267 are uniformly circumferentially spaced about the cylinder 232 to grab an exposed top surface of the lower most band 248 and to pull it from the cylinder 232 and into the groove 264 of the fixture 262. The external fingers 267 may be aided by the internal fingers 266 which, like those of Fig. 9A, urge the band 248 outward to expose the top surface thereof for engagement by the external fingers 267. In Fig. 9C, a plurality of plates 269, pivotally hinged as at 271, are operatively positioned to rotate through associated vertical slots 273 to urge the lower most band 248 into the groove 264, as shown. As in the prior embodiments, the plates 269 may be pneumatically or hydraulically attached. As a part of the instant invention, it is also contemplated that a portion of the band 248 may be initially urged onto the fixture 262, with the remainder of the band 248 being subsequently transferred by other mechanical means. For instance, in Fig. 9D a portion of the lowermost band 248 is urged into the groove 264 and a roller 275 is then urged against the band 248 within the groove. Then, relative rotation between the roller 275 and cylinder 232 deposits the remaining portion of the band 248 into the groove 264. In this embodiment, the band 248 may initially be urged into the groove 264 by a single spatula or finger 266, by a single pair of inner and outer fingers 266, 267, or by a single hinged plate, each of the type discussed above. The roller 275 would be hydraulically or pneumatically actuated to contact the deflected portion of the band as aforesaid. It will be appreciated by those skilled in the art that the urging of the band 248 from the groove 252 and into the groove 264 of the fixture 262 causes some stretching in the band 248. For example, as shown in Fig. 9A, the inner circumferential edge 278 of the band 248 will not dimensionally change, but the circumference thereof will remain substantially the same as it is transferred from the groove 252 to the groove 264. However, the outer circumferential edge 280 of the band 248 will increase by an amount directly proportional to the total width of the band 248, this occurring because the axis of the band 248 has remained the same, but the orientation of the band has passed through an angle of 100° - 105°, and in the preferred embodiment 103°. Those skilled in the art would readily appreciate that, since the circumference of a circle is equal to pi times the diameter, for a white sidewall band having a width of 12.7 mm (1/2 inch), the total difference between the inside and outside diameters of the band will be 25.4 mm (1 inch) and, accordingly, the outside circumferential edge 280 will have increased by 79.756 mm (3.14 inches) during the process of transferring the band 248 from the cylinder 232 to the fixture 262 to form the white sidewall band. The rubber stock comprising the layers 254, 256, being elastomeric and forgiving, and further being uncured, readily accommodates such stretching without objectionable distortion. With the band 248 positioned within the fixture 262, there need only be a transfer of the band 248 to the tire curing mold to now effect bonding or vulcanization of the white sidewall band to the tire during the tire curing operation. To this end, the structure of Figs. 10A-10C may be employed. As shown, the fixture 262 may be reciprocatingly moved from beneath the cylinder 232 and positioned below a vacuum transfer ring 270. The transfer ring 270 may be brought into contact with the band 248 with an appropriate vacuum lifting the band 248 from the fixture 262 for transfer to a tire mold 272. It will be appreciated that the transfer ring 270 will, most preferably, have a groove therein which is of the same size, orientation, and angle as the groove 264 within the fixture 262 to receive the band 248. The tire mold 272 is adapted to receive a green tire, form the tire, generate a tread thereon, vulcanize, and cure the tire. Such structure is well known to those skilled in the art. Included in the interior of the mold 272 is a bladder 274 which is inflated during the curing process to an appropriate pressure. As shown in Fig. 11, the mold 272 includes a groove 282 therein, the same being substantially identical to the groove 264 of the fixture 262. The band 248 is centrally or uniformly positioned within the groove 282. Guide pins 276 (Fig. 10C) extending from the mold 272 are adapted to engage the transfer ring 270 to assure such accurate positioning. With the band 248 properly received within the groove 282, a green tire is then transferred into the mold 272 in standard fashion. The green tire forcefully engages the barrier layer 254 of the band 248 during the curing press operation. As presented earlier, with the cross sectional area of the band 248 being substantially equal to the cross sectional area of the groove 282, this forceful engagement causes the band 248 to fill the cavity of the groove 282 while remaining in intimate contact with the surface of the tire received within the mold. Accordingly, only the barrier stock 254 engages the black rubber of the tire, while white sidewall stock 256 is sharply and accurately defined by the walls of the groove 282. Both the band 248 and the green tire 240 cure together within the mold 272, with the band 248 becoming fused or bonded by vulcanization to the tire. The tire curing process continues to completion in ordinary fashion. Those skilled in the art will readily appreciate that the white sidewall forming fixture 262, containing a band 248, could be received by the tire mold 272 during the curing operation. This technique and structure would eliminate the need for the removal of the band 248 from the fixture 262 and the subsequent transfer of the band 248 to the mold 272. In such event, the mold 272 would simply be housed out to receive the entirety of the forming fixture 262. It will further be appreciated by those skilled in the art that the band forming roll 230 will typically have an outside diameter which is substantially equal to the ultimate inside diameter of the white sidewall band. Further, it will be noted that bottom surfaces of the grooves 264 and 282 typically form a truncated cone, the angle of the side being equal to the angle of the tire surface to which the band is to be applied. With reference again to Figs. 8, and 9A-9D alternative embodiments of the invention may be appreciated. The roll 232 may be provided with segmented passages 258 in communication with each of the grooves. Each segmented passage 258 of each groove 252 encompasses about 300° of the 360° in the circumference of the drum 232. In these alternate embodiments, the transfer or indexing ring 260 is eliminated. The forming fixture 262 is annular, receiving the roll 232 in a central aperture thereof. The roll 232 is adapted to move vertically in an indexing fashion to successively bring the bands 248 into juxtaposition with the fixture 262. Received within the roll 232 and in operative alignment with the fixture 262 is an appropriate mechanism to feed the next band 248 into the groove 264, such as the elements 266, 267, 269, 275 discussed above. As such band 248 has been formed and transferred as discussed above, the roll 232 is indexed to bring the next band 248 into position for the forming operation. It is also contemplated as a portion of the invention that the forming roll 230 may serve as the storage cylinder 232. Since the forming roll 230 does not have circumferential grooves such as the grooves 252, the bands 248 will necessarily be dispensed directly from the smooth outer surface of the roll 230. In one embodiment, the bands 248 may be separated and spaced apart upon the roll 230 by means of the vacuum sleeve 250 as discussed above. Of course, the roll 230 would be elongated to accommodate such spacing. Dispensing of the bands 248 from the roll 230 would then proceed in any of the fashions discussed above. Still another embodiment of the invention contemplates that the roll 230 may serve as the storage cylinder without any requisite spacing of the bands therealong, but with the bands 248 abutted as cut. In this embodiment, shown in Fig. 12, the roll 230 maintaining the abutted bands 248 is inverted and coaxially aligned with an extending upwardly from the forming fixture 262. The bottom most band 248 is urged from the roll 230 and into the groove 264 of the forming fixture 262 in any of the manners discussed above. After the formed band is transferred from the fixture 262, the fixture returns to its position immediately beneath the roll 230 and the slide ring 277 slides the entire stack of bands 248 downward upon the roll 230 so that the bottom most band is in juxtaposition to the fixture 262 for the forming operation. Thus it can be seen that the objects of the invention have been satisfied by the structure presented above. While in accordance with the patent statutes only the best mode and preferred embodiment of the invention has been presented and described in detail, it is to be understood that the invention is not limited thereto or thereby.

Claims: Apparatus for applying a white sidewall applique to a tire, comprising (a) forming and cutting means (230, 246) for forming and cutting individual uncured bands (248) of a layer (254) of barrier rubber compound and a layer (256) of white rubber compound; and (b) transferring means (236) for transferring said individual uncured bands (248) from said forming and cutting means (230, 246) to a tire curing press (238); characterized by further comprising: (A) means (214, 218) for mixing and calendering said layer (254) of barrier rubber compound; (B) means (212, 216) for mixing and calendering said layer (256) of white rubber compound; and (C) a laminator (220) for receiving said layers (254, 256) of barrier and white rubber compounds and laminating said layers (254, 256) together, forming an uncured laminate; said forming and cutting means (230, 246) being adapted to form a cylinder (244) of said laminate and to cut said cylinder (244) into a plurality of said uncured bands (248); and said transferring means (236) comprising: (1) a storage cylinder (230, 232) for receiving and maintaining said bands (248); (2) a fixture (262) adapted to be positioned at an end of said storage cylinder (230, 232), to receive bands (248) from said storage cylinder (230 or 232) and to form said white sidewall applique; and (3) intermediate transfer means (266, 267, 269) for urging a band (248) from said storage cylinder (230, 232) and onto said fixture (262), said intermediate transfer means (266, 267, 269) reorienting said band (248) by deflecting said band through an area of at least 90° while maintaining said band (248) about a fixed axis. Apparatus according to claim 1, characterized in that said storage cylinder (232) comprises spaced apart circumferential grooves (252) receiving and maintaining said bands (248) in spaced apart relationship to each other. Apparatus according to claim 1 or 2, characterized in that said storage cylinder (232) has radial openings (258, 273) passing therethrough at said end, and a rotatable and extendable member (266, 269) adapted to extend through said openings (258, 273) and urge a band (248) covering said openings (258, 273) from said storage cylinder (232) and onto said fixture (262). Apparatus according to claim 1, characterized in that said fixture (262) has a circular groove (264) receiving said band (248). Apparatus according to claim 4, characterized in that said circular groove (264) has an angled bottom surface forming a truncated cone. Apparatus according to claim 1, characterized in that said transferring means (236) further comprises a vacuum ring (270) for lifting said band (248) from said fixture (262) and depositing said band (248) in said tire curing press (238). Apparatus according to claim 5 or 6, characterized in that said tire curing press (238) receives said band (248) in a groove having an angled bottom surface forming a truncated cone substantially congruent with said truncated cone of said fixture (262): Apparatus according to claim 7, characterized in that said groove of said tire curing press (238) has a cross sectional area substantially equal to a cross sectional area of said band (248). Apparatus according to claim 1, characterized in that said forming and cutting means (230, 246) comprises a plurality of rotary blades axially aligned and spaced apart a distance equal to a width of said bands (248). Apparatus according to claim 1, characterized by comprising a source (228) of backing paper or of another carrier or release liner (52) interconnected with said laminate, said laminate being received upon said paper or other carrier or release liner (52).

Inventors: BOHM GEORGE G A, OBERSTER ARTHUR E, YANG JAMES H C, BOHM, GEORGE G. A., OBERSTER, ARTHUR E., YANG, JAMES H. C.
Applicants: BRIDGESTONE CORP, BRIDGESTONE CORPORATION
Application year: 1992
Main classification: B29D30
IPC codes: B29K21, B29C33, B29C31, B29D30, B60C13, B29K105