Injected sealant balance

Abstract

The tire may include a tread portion, first and second sidewall portions extending radially inward from the tread portion, an inner surface defining an interior cavity of the tire between the first and second sidewall portions, and a spirally wound sealant bead disposed on the inner surface, the sealant bead having a beginning portion proximate the first sidewall and a terminal portion proximate the second sidewall, the beginning portion and the terminal portion overlap by an overlap angle in the range of 80 to 100 degrees about the tire axis.

Description

[Technical field]

[0001] The present disclosure relates generally to methods and apparatus for applying a sealant layer to an inner surface of a tire. Such an apparatus is sometimes referred to as a tire sealant cell. [Background technology]

[0002] Typical prior art tire sealant cells are described in WO2019123272(A1) and WO2019123275(A1). Summary of the Invention [Problem to be solved by the invention]

[0003] There is a need for an improved method and apparatus for applying a sealant layer to the inside surface of a tire.

[0004] The present disclosure relates to a method for improving the inherent balance of a tire when a sealant layer is applied to the tire, and to an improved tire produced by such a process.

[0005] In one embodiment, a method of applying a sealant layer to an inner surface of a tire includes: (a) placing a tire on a sealant application stand with the tire's axis of rotation oriented substantially horizontally; (b) applying a sealant bead to an inner surface of the tire with a dispensing tool carried by a dispensing robot as the tire is rotated by the sealant application stand to form a sealant layer on the inner surface of the tire; (c) sensing the rotational position of the tire by detecting a physical indicia on the rotating tire passing by a sensor during step (b); (d) determining a circumferential position of the balancing light spot on the tire relative to the physical indicia; Step (b) is Initiating application of a sealant bead at a first circumferential position forward of the balance light spot in a rotational direction by a first angle about an axis of rotation of the tire; and ceasing application of the sealant bead at a second circumferential location behind the balancing light spot by a second angle substantially equal to the first angle.

[0006] In another embodiment, a tire may include a tread portion, first and second sidewall portions extending radially inward from the tread portion, an inner surface defining an interior cavity of the tire between the first and second sidewall portions, and a spirally wound sealant bead disposed on the inner surface, the sealant bead having a beginning portion proximate the first sidewall and a terminal portion proximate the second sidewall, the beginning and terminal portions overlap by an overlap angle in the range of 80 to 100 degrees about the tire axis.

[0007] Numerous objects, features and advantages of the present invention will become readily apparent to those of ordinary skill in the art upon reading the following disclosure in conjunction with the accompanying drawings. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view of a tire sealant cell system according to the present disclosure. [Diagram 2] 2 is a left front perspective view of the tire sealant cell system of FIG. 1. FIG. [Diagram 3] FIG. 3 is a schematic cross-sectional view of a tire positioned at one of the application stands with a dispensing robot holding a dispensing tool within a cavity of the tire to apply a sealant bead. [Figure 4] FIG. 4 is an enlarged schematic cross-section of a tire showing a sealant bead partially placed to form a sealant layer on the inner surface of the tire. [Diagram 5] FIG. 5 is a front view of the tire handling robot. [Figure 6]FIG. 6 is a side view of the tire handling robot. [Figure 7] FIG. 7 is a perspective view of one application stand. [Figure 8] FIG. 8 is an end view of the coating stand of FIG. [Figure 9] FIG. 9 is a rear view of the coating stand of FIG. [Figure 10] FIG. 10 is a side view of the dispensing robot. [Figure 11] FIG. 11 is a front view of the dispensing robot. [Figure 12] FIG. 12 is a top view of the dispensing robot. [Figure 13] FIG. 13 is an enlarged side view of a dispensing tool held by the dispensing robot. [Figure 14] FIG. 14 is a front view of a dispensing tool held by the dispensing robot. [Figure 15] FIG. 15 is a cross-sectional view of a dispensing tool held by a dispensing robot. [Figure 16] FIG. 16 is a schematic diagram of the controller and related components of the tire sealant cell system. [Figure 17] FIG. 17 is a visual representation of a gauge scan of the sealant layer on the inside surface of a tire. [Figure 18] FIG. 18 is a schematic side view of a tire having improved balance due to a sealant layer. [Figure 19] FIG. 19 is a layout diagram of a portion of the sealant layer of the tire of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Reference will now be made in detail to embodiments of the present disclosure, one or more drawings of which are described herein. Each drawing is provided by way of illustration of the present disclosure, and not by way of limitation. Indeed, it will be apparent to those skilled in the art that various modifications and variations can be made to the teachings of the present disclosure without departing from the scope of the present disclosure. For example, features illustrated or described as part of one embodiment can be used with another embodiment to yield still further embodiments.

[0010] Accordingly, the present disclosure is intended to cover such modifications and variations as fall within the scope of the appended claims and their equivalents. Other objects, features, and aspects of the present disclosure are disclosed in or are apparent from the following detailed description. It should be understood by those skilled in the art that the present discussion is merely a description of exemplary embodiments and is not intended as a limitation of the broader aspects of the present disclosure.

[0011] The words "connected," "attached," "joined," "mounted," "fastened," and the like, should be interpreted to mean any manner of joining two objects, including, but not limited to, the use of any fasteners, such as screws, nuts and bolts, bolts, pins and clevises, that allow for a static, translatable, or pivotable relationship, any type of welding, such as conventional MIG welding, TIG welding, friction welding, brazing, soldering, ultrasonic welding, torch welding, induction welding, the use of any resin, adhesive, epoxy, and the like, being integrally formed as a single piece, any mechanical fit, such as a friction fit, an interference fit, a slidable fit, a rotatable fit, a pivotable fit, any combination thereof, and the like.

[0012] Unless otherwise specified, any portion of a device of the present disclosure may be made from any appropriate or suitable material, including, but not limited to, metal, alloy, polymer, polymer blend, wood, composite, or any combination thereof.

[0013] The whole process: FIG. 1 illustrates a schematic top view of the tire sealant cell system 100, and FIG. 2 illustrates a schematic perspective view of the tire sealant cell system 100. The tire sealant cell system 100 is sometimes referred to herein as a tire sealant cell 100. The tire sealant cell system 100 is configured to automatically apply a sealant layer 102 to an inner surface portion 112 of a tire 110. The sealant layer 102 can be configured to automatically seal holes (not shown) in the tire 110, which may be caused by road debris, such as a nail (not shown). The sealant layer 102 is neither solid nor liquid, but remains in a semi-viscous state, such that the sealant layer 102 can bind to road debris that has entered the tire 110 and upon removal of the road debris, binds to itself and does not allow air to escape from the cavity 114 of the tire 110. The inner surface portion 112 of the tire 110 is sometimes referred to herein as the inner surface 112 of the tire 110. The cavity 114 of the tire 110 may be referred to herein as the interior 114 of the tire 110. The inner surface portion 112 of the tire 110 may be defined opposite a tread portion 116 of the tire 110 and may extend at least partially over sidewalls 118a and 118b of the tire 110. The tread portion 116 of the tire 110 may be referred to herein as the outer tread surface 116 of the tire 110. The tire sealant cell system 100 may provide higher power at better ratios than existing systems.

[0014] The sealant layer 102 may be composed of, for example, DOW® Sealant. In one particular embodiment, the sealant layer 102 may be a 10:1 weight ratio DOW® Sealant, including a part A component (not shown) and a part B component (not shown), which may be stored separately and mixed together at the time of application. In other embodiments, the ratio may be adjusted. The initial cure time of the sealant layer 102 may be one day, with a full cure of 28 days. The tire 110 may be moved prior to the one day mark, as long as care is taken not to significantly deform the tire 110. Thus, handling the tire 110 through the tread portion 116 may be useful, as disclosed further below.

[0015] Tires (e.g., first tire 110A, second tire 110B, third tire 110C, etc.) interact with the tire sealant cell system 100 by first being sequentially received by a supply conveyor 130 of the tire sealant cell system 100. The tires exit the tire sealant cell system 100 via a discharge conveyor 132 of the tire sealant cell system 100.

[0016] The supply conveyor 130 may include a tire identification station 140. The tire identification station 140 may include a first conveyor belt 142 for moving the tires 110 along the supply conveyor 130. The tire identification station 140 may further include a bar code reader (BCR) 144 configured to scan a tire code 120 (see FIG. 7) of the tire 110. The tire code 120 may also be referred to herein as a bar code 120. The bar code reader 144 may also be referred to herein as a scanner 144. The bar code reader 144 may be, for example, a data logic BCR array or the like. The tire code 120 may be unique to the tire 110 and may be stamped or defined on the outer surface of the tire 110 as shown in FIG. 3. The tire code 120 may further be associated with specific information about the tire 110, such as the tire's width, tread depth, sidewall height, aperture diameter, etc.

[0017] The supply conveyor 130 may further include a first weighing station 150. The first weighing station 150 may include a second conveyor belt 152 for moving the tire 110 along the supply conveyor 130. The first weighing station 150 is configured to weigh and record the weight of the tire 110 prior to applying the sealant layer 102 within the tire 110.

[0018] The supply conveyor 130 may further include a tire positioning station 160. The tire positioning station 160 may include a third conveyor belt 162 for moving the tire 110 along the supply conveyor 130. The tire positioning station 160 may further include a scanner 164 configured to be located at the center 122 of the tire 110. The center 122 of the tire 110 may also be referred to herein as the axis of rotation 122 of the tire 110, as shown in FIG. 3. In one particular optional embodiment, the scanner 164 may be a Fanuc irVision camera or the like, which may be paired with a polarized blue light (not shown) to aid in identifying the center 122 of the tire 110. According to this embodiment, the third conveyor belt 162 may be colored blue to increase the effectiveness of the scanner 164 (e.g., a Fanuc irVision camera or the like).

[0019] The tire sealant cell system 100 may further include a tire handling robot 200, at least one application stand 300, and a dispensing robot 400. The at least one application stand 300 may also be referred to herein as at least one sealant application stand 300. As shown, the at least one application stand 300 includes a first application stand 300A and a second application stand 300B. The first and second application stands 300A, 300B may be identical and will be described further with respect to the at least one application stand 300.

[0020] The first and second coating stands 300A, 300B may be positioned adjacent to one another such that a tire (e.g., the first tire 110A, the second tire 110B, the third tire 110C, etc.) may be received on the first and second coating stands 300A, 300B with the tire's axis of rotation 122 oriented approximately horizontally. Tires received on the first and second coating stands 300A, 300B may be aligned end-to-end such that the tread portions 116 face one another. The tire handling robot 200 may be positioned on one side of the first and second coating stands 300A, 300B. The dispensing robot 400 may be positioned on the opposite side of the first and second coating stands 300A, 300B. Thus, when the tire 110 is received by one of the first or second coating stands 300A, 300B, one sidewall of the tire 110 faces the tire handling robot 200 and another sidewall of the tire 110 faces the dispensing robot 400.

[0021] The tire handling robot 200 may be configured to pick up the tire 110 from the supply conveyor 130, or more specifically, the third conveyor belt 162 of the tire positioning station 160, and place the tire 110 on an unoccupied one of the first or second application stands 300A, 300B using the tire gripping tool 202 of the tire handling robot 200. The tire gripping tool 202 is configured to engage the tread portion 116 of the tire 110 as it moves the tire 110. The gripping force of the tire gripping tool 202 may be adjusted based on the tire cord 120.

[0022] In one particular embodiment, the tire handling robot 200 may further include a scanner 204. Once the tire handling robot 200 places the tire 110 in one of the at least one coating stands 300, the tire gripping tool 202 may disengage the tire 110 and use the scanner 204 carried by the tire handling robot 200 to scan (e.g., an initial scan or pre-scan) the inner surface portion 112 of the tire 110 while the tire 110 is being rotated by the at least one coating stand 300. In other embodiments, the dispensing robot 400 may include a scanner for performing the initial scan.

[0023] The dispensing robot 400 may be configured to apply the sealant bead 104 to the inner surface portion 112 of the tire 110 using a dispensing tool 402 of the dispensing robot 400 while the tire 110 is rotated by one of the at least one application stands 300 (as shown in Figures 3 and 4). The sealant bead 104 may be dispensed in a continuous ribbon on the inner surface portion 112 of the tire 110 by the dispensing tool 402 while the tire 110 is rotated by one of the at least one application stands 300 to form the sealant layer 102. The sealant bead 104 is preferably approximately rectangular in shape. The width of the sealant bead 104 may range from 6 mm to 18 mm, preferably from 6 mm to 10 mm. The thickness of the sealant bead may range from 3 mm to 5 mm, preferably about 4 mm. In one embodiment, the sealant bead may have a width of 8 mm and a thickness of 4 mm. In other embodiments, the width and thickness of the sealant bead 104 may vary.

[0024] The dispensing robot 400 can use an initial scan of the inner surface portion 112 of the tire 110 performed by either the tire handling robot 200 or the dispensing robot 400, as described above, to calculate a travel path in x, y, and z coordinates for dispensing the sealant bead 104, for example.

[0025] The dispense robot 400 may include at least one sensor 410 positioned on a dispense tool 402 of the dispense robot 400. The at least one sensor 410 may be configured to detect a position of the dispense tool 402 relative to the inner surface portion 112 of the tire 110. The at least one sensor 410 may be further configured to detect a distance 420 between the dispense tool and the inner surface portion 112 of the tire 110. In certain embodiments, the at least one sensor 410 may be utilized to perform an initial scan of the inner surface portion 112 of the tire 110 while the tire 110 is being rotated by the at least one coating stand 300.

[0026] Once the dispense robot 400 has completed depositing the sealant bead 104 on the inner surface portion 112 of the tire 110 to form the sealant layer 102, one of the tire handling robot 200 or the dispense robot 400 may be configured to scan the sealant layer 102 (e.g., final scan or post scan) to determine whether the gauge (e.g., thickness) of the sealant layer 102 or the sealant bead 104 is within a set standard (e.g., a minimum acceptable gauge for the sealant layer 102). For example, the gauge must be sufficient so that the sealing performance is not adversely affected. Thus, in certain embodiments, the scanner 204 of the tire handling robot 200 may be utilized to scan the sealant layer 102 on the inner surface portion 112 of the tire 110. In other embodiments, at least one sensor 410 may be utilized to scan the sealant layer 102 on the inner surface portion 112 of the tire 110.

[0027] The tire sealant cell system 100 may perform a final scan and record data corresponding to the gauge of the sealant layer 102 on the inner surface portion 112 of the tire 110, correlated with data corresponding to the location of the sealant layer 102 on the inner surface portion 112 of the tire 110. As shown in FIG. 17, the tire sealant cell system 100 may further include a display 518 configured to display a visual image 530 representative of the sealant layer 102 on the inner surface portion 112 of the tire 110. The visual image 530 may include a visual indicator 532, typically color-coded, corresponding to whether the gauge of the sealant layer is within a set standard. The visual image 530 may show a flat version of the tire 110, for example, divided into 5 mm by 5 mm sections. Each section may include a visual indicator 532.

[0028] In one particular optional embodiment, at least one sensor 410 may be utilized to scan the gauge of the sealant bead 104 in real time as the sealant bead 104 is applied to the inner surface portion 112 of the tire 110 and transmit associated data that is displayed on the display 518.

[0029] Once the final scan is complete, the tire handling robot 200 can pick up the finished tire 110 from the first or second coating stand 300A, 300B and place the tire 110 on the discharge conveyor 132. More specifically, the tire handling robot 200 can place the tire 110 on the discharge receiving station 170 of the discharge conveyor 132. The discharge receiving station 170 can include a fourth conveyor belt 172 for moving the tire 110 along the discharge conveyor 132.

[0030] The discharge conveyor 132 may further include a second weighing station 180. The second weighing station 180 may include a fifth conveyor belt 182 for moving the tire 110 along the discharge conveyor 132. The second weighing station 180 is configured to weigh the tire 110 after applying the sealant layer 102 within the tire 110. A change in weight of the tire 110 may be determined based on data from the first weighing station 150 and the second weighing station 180. The change in weight may be recorded, stored, tabulated, and used as a baseline data set associated with a particular tire via the tire code 120.

[0031] The discharge conveyor 132 may further include a final station 190. The final station 190 may include a sixth conveyor belt 192 for moving the tire 110 along the discharge conveyor 132. The tire 110 may exit the tire sealant cell system 100 from the final station 190. In other embodiments, the tire 110 may exit the tire sealant cell system 100 from the second weighing station 180.

[0032] The tire sealant cell system 100 further includes a plurality of electronic flow (eFlow) drum pumps 106, each pump containing one of two components used to generate the sealant used for the sealant bead 104. The sealant for the sealant bead 104 is provided to the dispense robot 400 from at least two of the plurality of eFlow drum pumps 106 at a given time, each of the at least two eFlow drum pumps containing a different one of the two components used to generate the sealant used for the sealant bead 104. The two components are mixed by the dispense robot 400 immediately prior to application of the sealant bead 104 to the inner surface portion 112 of the tire 110.

[0033] Tires (e.g., first tire 110A, second tire 110B, third tire 110C, etc.) can be continuously moved in and out of the tire sealant cell system 100. For example, one tire may be on each of the six conveyor belts and the first and second application stands 300A, 300B at a given time. The dispensing robot 400 can move back and forth between the first application stand 300A and the second application stand 300B to apply a sealant bead 104 into a tire positioned on a given application stand before moving to the other. For example, the tire handling robot 200 may position the first tire 110A on the first application stand 300A, after which an initial scan may be performed. While the dispensing robot 400 applies the sealant bead 104 to the inner surface portion 112 of the first tire 110A, the tire handling robot 200 may proceed to position the second tire 110B on the second application stand 300B. Once the dispensing robot 400 has completed applying the sealant bead 104 to the first tire 110A, the dispensing robot 400 may move to the second application stand 300B and begin applying the sealant bead 104 to the inner surface portion 112 of the second tire 110B. Once the final scan of the first tire 110A has been performed, the tire handling robot 200 may proceed to remove the first tire 110A from the first application stand 300A and position the first tire 110A on the discharge conveyor 132. The tire handling robot 200 may then proceed to position the third tire 110C on the first application stand 300A. Once the dispensing robot 400 has completed application of the sealant bead 104 to the second tire 110B, the dispensing robot 400 can return to the first application stand 300A and begin applying the sealant bead 104 to the inner surface portion 112 of the third tire 110C. Once a final scan of the second tire 110B has been performed, the tire handling robot 200 can proceed to remove the second tire 110B from the second application stand 300B and position the second tire 110B on the discharge conveyor 132.The application of the sealant layer 102 to the tire may generally proceed continuously in this general manner. The inclusion of the first and second application stands 300A, 300B increases the efficiency or throughput of the tire sealant cell system 100.

[0034] Tire handling robot: FIG. 5 shows a schematic front view of the tire handling robot 200, and FIG. 6 shows a schematic side view of the tire handling robot 200.

[0035] The tire handling robot 200 may include an articulated arm assembly 210 having at least three degrees of freedom. A proximal end 212 of the articulated arm assembly 210 may be coupled to a surface mounting plate 220 configured to be coupled to a support surface. The tire gripping tool 202 and the scanner 204 may be coupled to a distal end 214 of the articulated arm assembly 210. The proximal end 212 may also be referred to herein as the proximal arm member 212, and the distal end 214 may also be referred to herein as the distal arm member 214.

[0036] The tire handling robot 200 may further include a first arm portion 230 and a second arm portion 232 coupled to the distal end 214 of the articulated arm assembly 210. The first arm portion 230 may also be referred to herein as the first arm 230, and the second arm portion 232 may also be referred to herein as the second arm 232. The tire gripping tool 202 may be coupled to the first arm portion 230, and the scanner 204 may be coupled to the second arm portion 232. Thus, the first arm portion 230 may carry the tire gripping tool 202, and the second arm portion 232 may carry the scanner 204. In certain embodiments, at least one of the first arm portion 230 or the tire gripping tool 202 may comprise a pneumatic double-ended cylinder.

[0037] The tire gripping tool 202 may include rubber bumpers 240 attached to the ends of the tire gripping tool 202 to provide additional grip when engaging the tread portion 116 of the tire 110 .

[0038] As previously described, the tire handling robot 200 is configured to pick up the tire 110 from the tire positioning station 160 using the tire gripping tool 202 such that the tire gripping tool 202 engages the tread portion 116 of the tire 110. The gripping force applied by the tire gripping tool 202 to the tread portion 116 of the tire 110 is adjusted based on the tire code 120 scanned by the tire identification station 130. The tire handling robot 200 then places the tire 110 on one of the application stands 300A or 300B that is available to receive the tire 110 and disengages the tire gripping tool 202 from the tire 110. Once disengaged, the tire handling robot 200 may insert the scanner 204 into the cavity 114 of the tire 110 and perform an initial scan.

[0039] Sealant application stand: Figure 7 shows a schematic perspective view of at least one coating stand 300, Figure 8 shows a schematic side view of at least one coating stand 300, and Figure 9 shows a schematic rear view of at least one coating stand 300. The first and second coating stands 300A, 300B may be identical and may be further described by describing the at least one coating stand 300.

[0040] At least one application stand 300 can include an upper stabilizing bar 310 and a number of drive rollers (not shown) positioned below the upper stabilizing bar 310. An upper portion of the inner diameter 124 of the tire 110 can be configured to rest on the upper stabilizing bar 310. A portion of the tread portion 116 of the tire 110 can be configured to rest on the number of drive rollers. The number of drive rollers can be configured to rotate the tire 110 about its axis of rotation 122, for example, during scanning of the inner surface portion 112 of the tire 110 and during application of the sealant bead 104 to the inner surface portion 112 of the tire 110.

[0041] At least one application stand 300 may further include a plurality of bead spreader fingers 320 configured to spread the bead 126 of the tire 110 so that the dispensing robot 400 can more easily access the inner surface portion 112 of the tire 110. The upper stabilizing bar 310 and the plurality of drive rollers may act downwards simultaneously to allow the plurality of bead spreader fingers 320 to reach into the cavity 114 of the tire 110. Once the plurality of bead spreader fingers 320 are in position, the upper stabilizing bar 310 and the plurality of drive rollers may act upwards simultaneously to engage the plurality of bead spreader fingers 320 with the bead 126 of the tire 110 so that the bead 126 seats within the plurality of bead spreader fingers 320. Once seated, the plurality of bead spreader fingers 320 may be actuated to move away from the tire 110, thereby spreading the bead 126 of the tire 110 to a set distance.

[0042] The at least one application stand 300 may further include a plurality of lateral stabilizing arms 330 configured to pivot to engage the tread portion 116 of the tire 110. Each of the plurality of lateral stabilizing arms 330 may include a roller configured to rollingly engage the tread portion 116 of the tire 110. The plurality of lateral stabilizing arms 330 may be configured to engage the tread portion 116 of the tire 110 prior to rotation of the tire 110 by the plurality of drive rollers.

[0043] All movements of the at least one coating stand 300 may be accomplished using servo motors, with the exception of the upper stabilizing bar 310 and the multiple lateral stabilizing arms 330. The upper stabilizing bar 310 and the multiple lateral stabilizing arms 330 may utilize air cylinders whose pressure is controlled using proportional valves.

[0044] At least one application stand 300 may further include a sensor 340 coupled to the upper stabilizing bar 310. The sensor 340 may be configured to sense a rotational position of the tire 110 by detecting a physical indicia on the rotating tire 110 passing the sensor 340. The physical indicia may be, for example, a tire cord 120 defined on the tire 110. The sensor 340 may be, for example, a sensor such as a BANNER® QS30PDPQ sensor.

[0045] Dispensing Robot: Figure 10 shows a schematic side view of dispense robot 400, Figure 11 shows a schematic front view of dispense robot 400, and Figure 12 shows a schematic bottom view of dispense robot 400. Figure 13 shows a schematic side view of dispense tool 402 of dispense robot 400 from Figure 10. Figure 14 shows a schematic bottom view of dispense tool 402 of dispense robot 400 from Figure 12. Figure 15 shows a schematic cross-sectional view of dispense tool 402 of dispense robot 400.

[0046] The dispensing robot 400 may include an articulated arm assembly 430 having at least three degrees of freedom. A proximal end 432 of the articulated arm assembly 430 may be coupled to a surface mounting plate 440 configured to be coupled to a support surface. The dispensing tool 402 may be coupled to a distal end 434 of the articulated arm assembly 430. Thus, the dispensing tool 402 is configured to be carried by the distal end 434 of the articulated arm assembly 430 of the dispensing robot 400. The proximal end 432 may be sometimes referred to herein as a proximal arm member 432, and the distal end 434 may be sometimes referred to herein as a distal arm member 434.

[0047] The dispensing robot 400 may further include a mixing valve 450 positioned on one of the articulated arm assemblies 430 or the dispensing tool 402. The mixing valve 450 may be configured to be coupled to two of the eFlow drum pumps 106 via a first sealant component metered dispenser 452 and a second sealant component metered dispenser 454. The first and second sealant component metered dispensers 452, 454 may be gear meters, such as NORDSON® servo-driven gear meters. In other optional embodiments, the first and second sealant component metered dispensers 452, 454 may be GRACO® HFR pumps (e.g., featuring a hydraulic reciprocating pistol). As best seen in FIGS. 10 and 11, the first and second sealant component metered dispensers 452, 454 may be attached to the articulated arm assembly 210. First and second flexible conduits 455 and 457 may connect the first and second sealant component metered dispensers 452, 454, respectively, to a sealant nozzle 460, as seen diagrammatically in FIG.

[0048] A first shut-off valve 459 may be disposed between the first sealant component metered dispenser 452 and the sealant nozzle 460 to shut off the flow of the first sealant component. A second shut-off valve 461 may be disposed between the second sealant component metered dispenser 454 and the sealant nozzle 460 to shut off the flow of the second sealant component. The shut-off valves 459 and 461 are preferably snuff-back valves. The working principle of the snuff-back valve is that when the valve is shut off, a negative pressure is generated to pull back the sealant material to achieve a quick shut-off and / or prevent the sealant material from dripping.

[0049] A first on / off valve 465 may be located upstream of the first sealant component metered dispenser 452. A second on / off valve 467 may be located upstream of the second sealant component metered dispenser 454. The on / off valves may be pancake-type valves.

[0050] The dispense tool 402 may include a sealant nozzle 460. The sealant nozzle 460 may include a nozzle tip 462 configured to dispense the sealant bead 104. At least one sensor 410 may be positioned on the dispense tool 402 and may be configured to sense a position of the nozzle tip 462 relative to the inner surface portion 112 of the tire 110.

[0051] The at least one sensor 410 of the dispense robot 400 may include a first sensor 412 and a second sensor 414 located on either side of the sealant nozzle 460. The first sensor 412 may also be referred to herein as a first distance sensor 412, and the second sensor 414 may also be referred to herein as a second distance sensor 414. The first and second sensors 412, 414 (as shown in FIG. 13 ) may be configured to view along a length 464 of the sealant nozzle 460 such that a distance 420 of the nozzle tip 462 from the inner surface portion 112 of the tire 110 may be detected by at least one of the first sensor 412 or the second sensor 414. The first and second sensors 412, 414 may be, for example, LJV KEYENCE® profilometers.

[0052] In an embodiment as seen in Figure 14, one of the first and second sensors 412, 414 may be located upstream of the sealant nozzle 460 with respect to the direction of rotation of the tire 110 relative to the sealant nozzle 460, and the other of the first and second sensors may be located downstream of the sealant nozzle with respect to the direction of rotation of the tire 110. In Figure 14, assuming the tire rotation direction is from left to right, the first sensor 412 is an upstream sensor and the second sensor 414 is a downstream sensor.

[0053] The nozzle tip 462 has a tip axis 463 that defines the direction in which the bead of sealant 104 is dispensed from the nozzle tip 462. The first and second distance sensors 412 and 414 each have a sensing axis 413 and 415, respectively, that is aligned parallel to the dispense axis 463 of the nozzle tip 462.

[0054] One of the first and second distance sensors, in the illustrated embodiment the first distance sensor 412, is positioned beside the sealant nozzle 460 such that a distribution axis 463 of the nozzle tip 462 and a sensing axis 413 of the first distance sensor 412 intersect the inner surface 112 along a common circumferential line of the inner surface 112 as the nozzle tip 462 transversely traverses the width of the inner surface 112 of the tire 110. The other of the first and second distance sensors, in the illustrated embodiment the second distance sensor 414, is positioned transversely rearward (e.g., within 11 to 16 mm rearward) relative to the sealant nozzle 460 such that the nozzle tip 462 leads the second distance sensor 414 as the nozzle tip 462 transversely traverses the width of the inner surface 112. For example, as seen in the schematic diagram of FIG. 4, the nozzle tip 462 is shown moving transversely from left to right in the diagram to lay down the sealant bead 104.

[0055] The first and second sensors 412 and 414, in combination with a controller 500, described further below, enable the nozzle tip 462 to be oriented perpendicular to the inner surface 112 of the tire 110. The controller is configured to receive distance signals from the first and second distance sensors 412 and 414 and, based on the geometry of the inner surface 112 of the tire 110, orient the sealant nozzle 460 such that the dispensing axis 463 is maintained perpendicular to the inner surface 112 of the tire 110 as the nozzle tip 462 traverses the width of the inner surface 112 in the transverse direction.

[0056] As previously mentioned, in certain optional embodiments, at least one of the first sensor 412 or the second sensor 414 may be utilized to scan a gauge of the sealant bead 104 in real time as the sealant bead 104 is applied to the inner surface portion 112 of the tire 110 and transmit associated data for display on the display 518. For example, one of the first sensor 412 or the second sensor 414 may be configured to scan the inner surface portion 112 of the tire 110, while the other sensor scans the sealant bead 104 immediately after application to the inner surface portion 112 of the tire 110.

[0057] The sealant nozzle 460 may further include a static mixer 470 positioned between the nozzle tip 462 and the first and second sealant component metered dispensers 452, 454. The static mixer 470 may also be referred to herein as an internal static mixer 470. As shown in FIG. 15, the static mixer 470 may include multiple irregular internal passages to create a thorough mix of the two sealant components before exiting the sealant nozzle tip 462. The static mixer 470 may have a length ranging from 12 to 18 inches, preferably about 16 inches.

[0058] The first and second sealant component metered dispensers 452, 454 may be directly coupled to the static mixer 470. In certain alternative embodiments, the first and second sealant component metered dispensers 452, 454 may be coupled to the static mixer 470 using first and second flexible conduits 455 and 457.

[0059] The dispensing tool 402 may further include an air nozzle 480 positioned adjacent the nozzle tip 462 and configured to emit an air stream 482 directed at the sealant bead 104 to aid in adhering the bead of sealant material to the inner surface portion 112 of the tire 110 (as shown in FIG. 14 ). In certain embodiments, the air stream 482 may be flat.

[0060] In certain optional embodiments, the dispensing robot 400 may include a camera 483 mounted on the dispensing tool 402, allowing an operator to view the sealant bead 104 on the display 518 as it is dispensed.

[0061] controller: Figure 16 illustrates generally the controller 500 of the tire sealant cell system 100. The controller 500 is capable of generating command signals for controlling the operation of various components of the tire sealant cell system 100 (e.g., tire identification station 140, first weighing station 150, tire positioning station 160, discharge receiving station 170, second weighing station 180, final station 190, tire handling robot 200, first and second application stations 300A, 300B, and dispensing robot 400), which are illustrated generally in Figure 16 by phantom lines connecting the controller 500 to the various aforementioned components, with arrows indicating the flow of command signals from the controller 500 to the respective components.

[0062] It will be appreciated that, as disclosed herein, data from the various aforementioned components may be transmitted to the controller 500 from the various aforementioned components, as indicated generally by the phantom lines and arrows.

[0063] For example, command signals from the controller 500 to each of the tire identification station 140, the first weighing station 150, the tire positioning station 160, the discharge receiving station 170, the second weighing station 180, and the final station 190 can control the movement of each of the first, second, third, fourth, fifth, and sixth conveyor belts 142, 152, 162, 172, 182, 192. Data from the tire identification station 140 to the controller 500 can include the tire code 120 scanned by the bar code reader 144. Data from the first weighing station 150 to the controller 500 can include the weight of the tire 110 (e.g., the first tire 110A, the second tire 110B, the third tire 110C, etc.) prior to application of the sealant layer 102. The data from the tire positioning station 160 to the controller 500 may include the position of the tire 110 on the third conveyor belt 162, which may be utilized by the tire handling robot 200 to engage the tire 110. The data from the second weighing station 180 to the controller 500 may include the weight of the tire 110 (e.g., the first tire 110A, the second tire 110B, the third tire 110C, etc.) after application of the sealant layer 102. The controller 500 may store the before and after weights of the tire 110 in association with the tire cord 120 for use in future applications of the sealant layer 102 to tires having the same tire cord 120.

[0064] Further, for example, command signals from the controller 500 to the tire handling robot 200 can control the movement of the articulated arm assembly 210, the tire gripping tool 202, and the scanner 204, as well as the functionality of the scanner 204. Data from the tire handling robot 200 to the controller 500 can include the respective positions of the articulated arm assembly 210, the tire gripping tool 202, and the scanner 204, as well as the output from the scanner 204 associated with the tire 110, which can be utilized to plot a travel path in x, y, and z coordinates of the dispensing robot 400 to apply the sealant bead 104 to the tire 110.

[0065] Further, for example, command signals from the controller 500 to each of the first and second coating stations 300A, 300B can control the movement of each of the drive rollers, upper stabilizing bar 310, bead spreader fingers 320, and lateral stabilizing arms 330 associated with each respective coating station. Data from each of the first and second coating stations 300A, 300B to the controller 500 can include the positions of each of the drive rollers, upper stabilizing bar 310, bead spreader fingers 320, and lateral stabilizing arms 330 associated with each respective coating station.

[0066] Finally, for example, command signals from the controller 500 to the dispense robot 400 can control the movement of the articulated arm assembly 430 and the dispense tool 402, as well as the emission of the sealant bead 104 from the dispense tool 402 and the emission of the air stream 482 from the air nozzle 480, and the function of the at least one sensor 410. Data from the dispense robot 400 to the controller 500 can include the position of the articulated arm assembly 430 and the dispense tool 402, as well as an output from the at least one sensor 410 associated with at least one of the tire 110, the sealant bead 104, or the sealant layer 102.

[0067] The controller 500 may include or be associated with a processor 510, a computer readable medium 512, a database 514, and an input / output module or control panel 516 having a display 518. An example of the display 518 is also shown in Figure 17. An input / output device 520, such as a keyboard or other user interface, is provided to allow a human operator to input instructions to the controller. It is understood that the controller 500 described herein may be a single controller having all of the described functionality, or may include multiple controllers where the described functionality is distributed among the multiple controllers.

[0068] The various operations, steps, or algorithms described in connection with the controller 500 may be embodied directly in hardware, in a computer program product 522, such as a software module executed by the processor 500, or in a combination of the two. The computer program product 522 may reside in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, or any other form of computer readable medium 512 known in the art. An exemplary computer readable medium 512 may be coupled to the processor 500 such that the processor can read information from and write information to the memory / storage medium. Alternatively, the medium may be integral to the processor. The processor and the medium may reside in an application specific integrated circuit (ASIC). The ASIC may reside in a user terminal. Alternatively, the processor and the medium may reside as separate components in a user terminal.

[0069] The term "processor" as used herein may refer to at least a general-purpose or special-purpose processing device and / or logic as may be understood by one of ordinary skill in the art, including but not limited to a microprocessor, a microcontroller, a state machine, etc. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0070] As used herein, the terms "controller," "control circuitry," and "control circuitry" refer to, may be embodied by, or otherwise included within, a machine, such as a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed and programmed to perform or cause to be performed the functions described herein. A general purpose processor may be a microprocessor, but alternatively, the processor may be a microcontroller, or a state machine, combinations thereof, and the like. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0071] How to apply a layer of sealant to the inside of the tire: The method of applying the sealant layer to the inner surface of the tire is as follows: (a) picking up a first tire 110A with a tire handling robot 200 and placing the first tire 110A on a first application stand 300A with the rotation axis 122 of the first tire 110A oriented substantially horizontally; (b) scanning the inner surface 112 of the first tire 110A with a scanner 204 carried by the tire handling robot 200 as the first tire 110A is rotated by the first coating stand 300A; (c) applying a sealant bead 104 to the inner surface 112 of the first tire 110A using a dispensing tool 402 carried by a dispensing robot 400 as the first tire 110A is rotated by a first application stand 300A to form a sealant layer 102 on the inner surface 112 of the first tire 110A; (d) scanning the sealant layer 102 of the first tire 110A using a scanner 204 carried by the tire handling robot 200 as the first tire 110A is rotated by the first application stand 300A.

[0072] The tire handling robot 200 of the method may include a first arm portion 230 having a tire gripping tool 202 and a second arm portion 232 having a scanner 204. According to the method, after placing the first tire 110A on the first application stand 300A, the tire handling robot 200 may release the first tire 110A from the tire gripping tool 202, and then the tire handling robot 200 may insert the scanner 204 into the cavity 114 of the first tire 110A.

[0073] In step (a), the tire gripping tool 202 can grip the tread portion 116 of the first tire 110A.

[0074] The method may further include, after step (d), picking up the first tire 110A from the first coating stand 300A using the tire handling robot 200 and placing the first tire 110A on the discharge conveyor 132.

[0075] The method may further include, prior to step (a), weighing the first tire 110A on a first weighing station 150 of the supply conveyor 130 and weighing the first tire 110A again on a second weighing station 180 of the discharge conveyor 132 to determine a change in weight of the first tire 110A.

[0076] The method includes picking up a second tire 110B with the tire handling robot 200, placing the second tire 110B on a second application stand 300B with an axis of rotation 122 of the second tire 110B oriented substantially horizontally, scanning an inner surface portion 112 of the second tire 110B with a scanner 204 carried by the tire handling robot 200 as the second tire 110B is rotated by the second application stand 300B, and depositing a sealant layer 10 on the inner surface portion 112 of the second tire 110B. 2, the method may further include applying a sealant bead 104 to an inner surface portion 112 of the second tire 110B with a dispensing tool 402 carried by the dispensing robot 400 as the second tire 110B is rotated by the second application stand 300B, and scanning the sealant layer 102 of the second tire 110B with a scanner 204 carried by the tire handling robot 200 as the second tire 110B is rotated by the second application stand 300B.

[0077] The first and second coating stands 300A, 300B may be positioned adjacent to each other such that the tread portion 116 of the first tire 110A on the first coating stand 300A faces the tread portion 116 of the second tire 110B on the second coating stand 300B, one sidewall of each tire faces the tire handling robot 200, and the other sidewall of each tire faces the dispensing robot 400. The tire handling robot 200 may perform a scanning process from one side of the first and second tires 110A, 110B. The dispensing robot 400 may perform a coating process from the opposite side of the first and second tires 110A, 110B.

[0078] The method may further include, prior to step (a), scanning the first tire 110A with a barcode reader 144 to identify the tire code 120. The tire gripping tool 202 may grip the tread portion 116 of the first tire 110A, with the gripping force being adjusted based on the tire code 120.

[0079] The method may further include, during step (c), sensing a gauge of the sealant bead 104 when the sealant bead 104 is placed on the inner surface portion 112 of the first tire 110A and recording data corresponding to the gauge of the sealant bead 104 in correlation with data corresponding to the position of the sealant bead 104 on the inner surface portion 112 of the first tire 110A.

[0080] The method may further include displaying on the display 518 a visual image 530 representative of the sealant bead 104 on the inner surface portion 112 of the first tire 110A. The visual image 530 (shown in FIG. 17 ) may include a visual indicator 532 corresponding to whether a gauge of the sealant bead 104 is within a set standard.

[0081] Further methods for applying a layer of sealant to the inner surface of a tire: A further method for applying a sealant layer to the inner surface of a tire comprises: (a) providing a tire sealant cell 100, first and second sealant application stands 300A, 300B disposed adjacent to one another such that when the tire 110A, 110B, 110C is received on the first and second sealant application stands with the tire's axis of rotation 122 oriented substantially horizontally, the tire is aligned end-to-end with the tread region 116 facing one another; a tire handling robot 200 located on one side of the first and second sealant application stands; providing a dispensing robot 400 located on an opposite side of the first and second sealant application stands from the tire handling robot; (b) picking up the first tire 110A with the tire handling robot 200 and placing the first tire 110A on a first sealant application stand 300A; (c) applying a sealant bead 104 to the inner surface 112 of the first tire 110A using a dispensing tool 402 carried by a dispensing robot 400 as the first tire 110A is rotated by the first sealant application stand 300A to form a sealant layer 102 on the inner surface 112 of the first tire 110A; (d) picking up the second tire 110B with the tire handling robot 200 and placing the second tire 110B on a second sealant application stand 300B; (e) applying a sealant bead 104 to the inner surface 112 of the second tire 110B using a dispensing tool 402 held by the dispensing robot 400 as the second tire 110B is rotated by the second sealant application stand 300B to form a sealant layer 102 on the inner surface 112 of the second tire 110B.

[0082] The method may further include, between steps (b) and (c), pre-scanning the inner surface portion 112 of the first tire 110A with a scanner 204 carried by the tire handling robot 200 as the first tire 110A is rotated by the first sealant application stand 300A.

[0083] During step (e), the method may further include post-scanning the sealant layer 102 of the first tire 110A with a scanner 204 carried by the tire handling robot 200 as the first tire 110A is rotated by the first sealant application stand 300A, then removing the first tire 110A from the first sealant application stand 300A by the tire handling robot 200 and placing the first tire 110A on an output conveyor 132, then picking up a third tire 110C by the tire handling robot 200 and placing the third tire 110C on the first sealant application stand 300A, and then pre-scanning the inner surface portion 112 of the third tire 110C with the scanner 204 carried by the tire handling robot 200 as the third tire 110C is rotated by the first sealant application stand 300A.

[0084] The method further includes, after step (d) and prior to removing the second tire 110B from the second sealant application stand 300B, post-scanning the sealant layer 102 of the first tire 110A with a scanner 204 carried by the tire handling robot 200 as the first tire 110A is rotated by the first sealant application stand 300A, and then removing the first tire 110A from the first sealant application stand 300A by the tire handling robot 200 and scanning the sealant layer 102 of the first tire 110A with a scanner 204 carried by the tire handling robot 200. The method may further include placing the tire 110A on the discharge conveyor 132, then picking up a third tire 110C by the tire handling robot 200 and placing the third tire 110C on the first sealant application stand 300A, and then pre-scanning the inner surface portion 112 of the third tire 110C by a scanner 204 carried by the tire handling robot 200 as the third tire 110C is rotated by the first sealant application stand 300A.

[0085] The method may further include, prior to step (c), pre-scanning the inner surface portion 112 of the first tire 110A with a scanner 204 carried by the tire handling robot 200 as the first tire 110A is rotated by the first sealant application stand 300A, and, after step (c), post-scanning the sealant layer 102 of the first tire 110A with the scanner 204 carried by the tire handling robot 200 as the first tire 110A is rotated by the first sealant application stand 300A.

[0086] The tire handling robot 200 may include a first arm portion 230 with a tire gripping tool 202 and a second arm portion 232 with a scanner 204. After placing the first tire 110A on the first sealant application stand 300A, the tire handling robot 200 may release the first tire 110A from the tire gripping tool 202, and then the tire handling robot 200 may insert the scanner 204 into the cavity 114 of the first tire 110A.

[0087] The method may further include, before step (b), weighing the first tire 110A on a first weighing station 150 of the supply conveyor 130, and after step (c), removing the first tire 110A from the first sealant application stand 300A with the tire handling robot 200 and placing the first tire 110A on the discharge conveyor 132, and weighing the first tire 110A again on a second weighing station 180 of the discharge conveyor 132 to determine a weight change of the first tire 110A.

[0088] The method may further include, prior to step (b), scanning the first tire 110A with a barcode reader 144 to identify the tire code 120. In step (b), a tire gripping tool 202 carried by the tire handling robot 200 may grip the tread portion 116 of the first tire 110A, and the gripping force may be adjusted based on the tire code 120.

[0089] The method may further include, during step (c), sensing a gauge of the sealant bead 104 when the sealant bead 104 is placed on the inner surface portion 112 of the first tire 110A and recording data corresponding to the gauge of the sealant bead 104 in correlation with data corresponding to the position of the sealant bead 104 on the inner surface portion 112 of the first tire 110A.

[0090] The method may further include displaying on the display 518 a visual image 530 representative of the sealant bead 104 on the inner surface portion 112 of the first tire 110A. The visual image 530 may include a visual indicator 532 corresponding to whether a gauge of the sealant bead 104 is within a set standard.

[0091] How to balance a tire and simultaneously apply a layer of sealant to the inside of the tire: The tire sealant cell system 100 may also be used to improve the balance of the tire 110, so that less additional balancing is required when the tire is mounted on a wheel. As shown generally in FIG. 18, the tire 110 includes an indicia 120, which may be a bar code physically placed on the tire. This indicia 120 may be used as a reference point to identify a circumferential position on the tire. Any other physical feature on the tire may also be used as a reference point. Before the tire 110 is received on the supply conveyor 130, the tire may be tested for balance and a "light spot" on the tire may be identified in relation to a reference point, such as the indicia 120. For example, as seen generally in FIG. 18, the light spot 121 may be identified as being at an angle 123 from the indicia 120. This data is stored in relation to the individual tire and associated with the indicia 120. Thus, when an individual tire is received on the supply conveyor and the indicia 120 is scanned by the scanner 164, the controller 500 will know the location of the light spot 121 on this individual tire. The position of the light spot 121 may be defined as the angular position 123 of a radial line 125 passing through the light spot 121 relative to the index 120 .

[0092] Then, when the sealant bead 104 is placed to form the sealant layer 102, it can be done to add more weight closer to the light spot 121 than other parts of the tire. The resulting tire with the sealant layer will be better balanced than before the addition of the sealant layer 102.

[0093] One way to achieve this improved balance is to overlap the beginning and ending portions of the spirally wrapped sealant bead 104 on opposite circumferential sides of the light spot 121. This is shown diagrammatically in Figures 18 and 19. The overlap may be achieved by starting application of the sealant bead 104 at a first circumferential location 127 in front of the balance light spot 121 in the direction of rotation 129 by a first angle 131 about the tire's axis of rotation, and stopping application of the sealant bead 104 at a second circumferential location 133 behind the balance light spot by a second angle 135 that is substantially equal to the first angle 131.

[0094] The second angle 135 may be within a range of ±10 degrees of the first angle 131, and more preferably within a range of ±5 degrees of the first angle 131.

[0095] The first angle 131 may be in the range of 30 to 60 degrees, more preferably in the range of 40 to 50 degrees, and most preferably about 45 degrees.

[0096] The result of this process is a tire 110 including a tread portion 116 and first and second sidewall portions 118a and 118b extending radially inward from the tread portion 116. The inner surface 112 defines an interior cavity 114 of the tire 110 between the first and second sidewall portions 118a and 118b. A spirally wound sealant bead 104 (see FIG. 19) is placed on the inner surface 112 and includes a beginning portion 104a closest to the first sidewall 118a and a terminal portion 104b closest to the second sidewall 118b. The beginning portion 104a and the terminal portion 104b overlap by an overlap angle 137 in the range of 80-100 degrees about the tire axis.

[0097] Tire light spot 121 may be located within overlap angle 137. Tire light spot 121 may be located within ±10 degrees of the center of overlap angle 137. Tire light spot 121 is preferably located at the center within overlap angle 137.

[0098] It will thus be seen that the apparatus and method of the present invention readily attains the objects and advantages mentioned, as well as those inherent therein. While certain preferred embodiments of the invention have been shown and described for purposes of this disclosure, many changes in the arrangement and configuration of the parts and steps may be made by one skilled in the art which changes will fall within the scope and spirit of the invention as defined by the appended claims.

Claims

1. 1. A method for applying a sealant layer to an inner surface of a tire, comprising the steps of: (a) placing the tire on a sealant application stand with the tire's axis of rotation oriented substantially horizontally; (b) applying a sealant bead to the inner surface of the tire with a dispensing tool carried by a dispensing robot as the tire is rotated by the sealant application stand to form a sealant layer on the inner surface of the tire; (c) sensing a rotational position of the tire by detecting a physical indicia on the rotating tire passing a sensor during step (b); and (d) determining a circumferential position of a balancing light spot on the tire relative to the physical indicia; Step (b) Initiating the application of the sealant bead from a first circumferential position forward of the balance light spot in a rotational direction by a first angle about the rotational axis of the tire; and stopping the application of the sealant bead at a second circumferential position behind the balancing light spot by a second angle within a range of ±10 degrees of the first angle.

2. The method of claim 1 , wherein the second angle is within ±5 degrees of the first angle.

3. The method of claim 1 , wherein the first angle is in the range of 30 degrees to 60 degrees.

4. 2. The method of claim 1, wherein in step (d), the circumferential position of the balancing light spot on the tire relative to the physical indicia is pre-stored in a controller memory and associated with a tire identification contained in the physical indicia.

5. The method of claim 1 , wherein the physical indicia is a bar code.

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