Patent Abstract:
In a processing facility comprising a plurality processing stations each for automatically conveying products in various stages of production for controlled processing, an intelligent product transfer and conveyance system that enables uninterrupted processing of only products determined as having passed a first inspection process at an upstream processing station. The intelligent product transfer and conveyance system for a processing facility ensures a continuous flow of a plurality of good products at sufficiently high speeds from an inspection process to subsequent stations for subsequent individualized packaging. The processing facility may comprise a contact lens manufacturing line for manufacturing spherical or toric type ophthalmic contact lens products.

Full Description:
FIELD OF THE INVENTION  
         [0001]    The present invention relates generally to a contact lens manufacturing facility for producing ophthalmic contact lenses, and, in particular to a control system and method for transferring formed lenses among one or more processing stations and controlling the automated transfer of individual lenses to individual packages.  
         DISCUSSION OF THE PRIOR ART  
         [0002]    Automated contact lens production processes are known wherein each lens is formed by sandwiching a monomer between back curve (upper) and front curve (lower) mold structure transported in a mold cavity. The monomer is polymerized (cured) to form a lens blank, and is subject to further processing including, but not limited to: removing the lens blanks from their mold structures, i.e., de-molding; subjecting the lenses to a hydration process; transferring of the lenses to an individual blister package; automatic lens inspection of the lens while contained in their blister pack; lens sterilization; and final packaging for consumer use. The reader may refer to issued patents U.S. Pat. No. 5,555,504 entitled PRODUCTION LINE TRACKING AND QUALITY CONTROL SYSTEM and U.S. Pat. No. 5,607,642 entitled INERACTIVE CONTROL SYSTEM FOR PACKAGING CONTROL for a description of an exemplary prior art ophthalmic lens production and packaging control system.  
           [0003]    These prior art automatic lens inspection processes provide for automated lens inspection relatively late in the manufacturing process, while the lens has already been “packaged”. Needless to say, there is much expenditure of time and resources in the prior de-molding, lens transfer and hydration process for lenses that might eventually be rejected as being defective in any event. Because of this, lens throughput is decreased while processing and material costs may increase, for instance the wastage of packages having defective lenses transferred thereto. Furthermore, the automated process may be subject to additional “down-time” due to increased likelihood of problems that may occur due to processing of defective lenses.  
           [0004]    It would be highly desirable to provide for an automated contact lens manufacturing process, a system and method that provides a first level of lens inspection after the de-molding process, to prevent extraneous material handling by enabling only acceptable lenses that have passed inspection proceed to hydration and subsequent to packaging.  
           [0005]    Moreover, it would be highly desirable to provide an intelligent lens transfer and conveyance system for a contact lens processing facility that enables uninterrupted processing of only lenses determined as having passed a first inspection process (i.e., “good” lenses).  
           [0006]    Moreover, it would be highly desirable to provide an intelligent lens transfer and conveyance system for a contact lens processing facility that ensures a continuous flow of good contact lenses at sufficiently high speeds from a first automatic lens inspection process through to hydration and packaging.  
         SUMMARY OF THE INVENTION  
         [0007]    Accordingly, it is an object of the present invention to provide a control system and method for controlling the automated intelligent transfer of products among a plurality of processing stations in a manufacturing facility, such as for manufacturing ophthalmic contact lenses.  
           [0008]    It is a further object of the present invention to provide an automated packaging control system that tracks discrete arrays of products conveyed on a serial flow production line and provides intelligent transfer so that only those products having passed an inspection criteria are packaged.  
           [0009]    Another object of the present invention is to provide a control system and method that tracks information relating to a first amount of products conveyed on a first transport structure and tracks the products when transferred to a subsequent transport structures capable of carrying a second amount of products for processing at downstream processing stations.  
           [0010]    It is yet a further object of the present invention to provide a control system and method that incorporates a mechanism for removing individual units of an array of products in accordance with the determination of an automated inspection system and causing the removal of rejected lenses, and, further tracking positional status of remaining products having passed inspection that remain in the array as they are conveyed throughout the system for subsequent processing.  
           [0011]    It is yet still a further object of the present invention to provide a means for staging packaging materials at a packaging station so that only products determined as passing inspection are packaged irregardless of the random manner in which the products are conveyed to the packaging station due to the removal of individual product units that have failed an acceptance criteria.  
           [0012]    Thus, according to the principles of the invention, there is provided for a processing facility comprising a plurality processing stations each for automatically conveying products in various stages of production for controlled processing, an intelligent product transfer and conveyance system that enables uninterrupted processing of only products determined as having passed a first inspection process at an upstream processing station. The intelligent product transfer and conveyance system for a processing facility ensures a continuous flow of a plurality of good products at sufficiently high speeds from an inspection process to subsequent stations for subsequent individualized packaging. The processing facility may comprise a contact lens manufacturing line for manufacturing spherical or toric type ophthalmic contact lens products.  
           [0013]    With respect to ophthalmic contact lens production, according to an aspect of the present invention, there is provided a system and method for automatically transporting a plurality of ophthalmic lenses for sequential processing at one or more processing stations, one processing station comprising a mechanism for determining locations of acceptable lenses to be transported for further downstream processing on one or more first transport structures, the method comprising:  
           [0014]    a) generating an information record associated with each first transport structure carrying a plurality of lenses, the record including information for identifying the lenses carried by the first transport structure and including a data structure identifying the locations of any acceptable lens carried on the first transport structure as determined at the processing station;  
           [0015]    b) conveying the first transport structure carrying zero or more acceptable lenses in sequence to one or more downstream processing stations, and while at each processing station accessing each information record and updating the associated information with status of lenses as a result of processing at the station;  
           [0016]    c) communicating an updated information record associated with a first transport structure currently en route to a lens unload area to a transport staging means for staging a plurality of individual transport structures each capable of receiving an individual lens to be transferred from the first transport structure, the staging means responsive to the data structure for aligning a plurality of individual transport structures in a staging area according to locations identified in the data structure as including an acceptable lens; and,  
           [0017]    d) transferring zero or more acceptable lenses from identified locations in the transport structure at the lens unload area to the staging area and placing a corresponding individual lens to an associated aligned individual transport structure, wherein the updated information record associated with a first transport structure currently en route to the lens unload area is communicated prior to arrival of the first transport structure thereat.  
           [0018]    It is an advantage that intelligent lens transfer system and methodology according to the invention decreases expenditures in materials and reduces processing costs by eliminating the packaging of lenses that may eventually be rejected as having failed an acceptance criteria and, vice versa, enabling the transfer of only good products to a packaging location. Moreover, the concept of intelligent lens transfer according to the principles of the invention described herein may be used in a variety of applications and not necessarily for purposes of transferring ophthalmic lens products, but any type of product that are transferred in plural from carriers to individual unit packages. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0019]    Details of the invention disclosed herein shall be described below, with the aid of the figures listed below, in which:  
         [0020]    [0020]FIG. 1 is a conceptual top plan view of the lens production facility including the various lens production stations involved with intelligent lens transfer according to the invention;  
         [0021]    FIGS.  2 ( a )- 2 ( b ) are block diagrams depicting the process  100  for intelligent material handling and lens transfer according to the principles of the invention;  
         [0022]    FIGS.  3 ( a ) through  3 ( c ) depict generally the lens pattern information flow in software from the front curve transfer after lens inspection to the intelligent puck staging and lens load station;  
         [0023]    [0023]FIG. 4 is a side elevational view of the hydration station for hydrating lenses in the lens production facility; and,  
         [0024]    [0024]FIG. 5 is a detailed top plan view of the lens puck transfer facility for enabling intelligent puck transfer according to the principles of the invention.  
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0025]    Referring to FIG. 1, there is shown a simplified diagrammatic view of a portion of a contact lens production system  10  including those material handling modules or processing stations designed to enable expedient and consolidated lens hydration and packaging processes. Briefly, as shown in FIG. 1, these stations include: an automatic lens inspection station  15  for receiving a conveyance of transportable structures  12  comprising an array of lens mold cavities having a formed lens blank therein, inspecting the lenses for defects, and generating a pattern of those lenses determined as passing a level of inspection so that only “good” lenses, i.e., those lenses having passed a first level of lens inspection, are subsequently processed; a lens removal station  20  including mechanisms for removing those lenses determined to have failed the lens inspection process; a lens transfer mechanism  25  for transferring each of the lenses from the transportable structures into a lens hydration tray  27  structure in accordance with the pattern generated by lens inspection station for a subsequent hydration process; a hydration station  30  including a hydration tower  35  enabling the expedient hydration of cured lens blanks in their hydration trays; an intelligent puck transfer assembly  50  for indexing and registering, in accordance with the pattern generated by the lens inspection process, a series of individual transport structures  52  referred to herein as “pucks” each puck carrying a single lens package capable of receiving an individual lens product; and a lens unload station  55  where a lens transfer assembly is actuated to transfer only those hydrated lens known to be present in the hydration tray from the communicated bit pattern, from the hydration tray to an individual package puck registered in accordance with the received pattern. As will be explained in greater detail, the expedited and intelligent lens product handling and conveyance is enabled under the programmed control and supervision of an enhanced programmable logic control system (PLC) or like equivalent control device  99  which includes a database comprising data records for tracking the locations of all possible lens fabrication transport structures and identifications.  
         [0026]    By way of background, production of the contact lens itself is briefly explained in the context of production control by way of example in above-mentioned U.S. Pat. No. 5,555,504, assigned to the same assignee as the instant invention. As described therein, arrays of ophthalmic contact lenses formed in mold assemblies are first cured in a curing assembly and subject to a de-mold process whereby a back curve mold is removed from a front curve mold while leaving the lens situated in the front curve mold cavity (not shown). In one embodiment, the lens front curve molds with formed lenses therein are carried by lens fabrication structures such as trays or “pallets”  12  configured to transport an array of molds, e.g., a 2×4 array of lenses, for conveyance throughout the system. Alternately, the transport structure may itself comprise an integrated array of front curve mold structures.  
         [0027]    FIGS.  2 ( a )- 2 ( b ) comprise a flow diagram depicting the process  100  for enabling intelligent lens transfer and conveyance in the lens handling system of FIG. 1. As now explained in the flow chart of FIG. 2( a ), at step  103 , the process begins by conveying the lens transport structure  12  which, for illustrative purposes, comprises a 2×4 pallet carrying an array lens mold structures and cured lens blanks therein, from a de-mold process (not shown) to the Automatic Lens Inspection station  15  where the lenses are coarsely analyzed in their front curve mold structure for defects such as rips or tears, darkspots, bubbles, impurities, and the like, according to conventional processes. One such inspection method is described in commonly-owned, co-pending U.S. patent application Ser. No. 09/751,875, filed Dec. 29, 2000 and entitled INSPECTION OF OPHTHALMIC LENSES USING ABSORPTION, the whole contents and disclosure of which is incorporated by reference as if fully set forth herein. Next, at step  106 , as a result of ALI processing, inspection data comprising the pass/fail status of individual cavities on the pallet is generated for inclusion in a data record associated with each pallet for tracking and control purposes. The pass/fail status of respective accepted/rejected lenses resulting from the lens inspection is represented as a bit pattern, as will be explained in greater detail.  
         [0028]    More specifically, according to the invention, as depicted in FIG. 1, each lens transport structure conveyed in the system has an associated electronic data record  13  that is communicated between the software control mechanisms of the PLC control system  99  at each successive material handling station as lens processing for that lens transport structure proceeds at the respective stations. Preferably, the electronic data record  13  associated with the lens transport structure that is conveyed in the system includes information for identification and tracking including, but not limited to: a unique identifier for the lens transport structure (e.g., pallet) carrying the lens, a lot number, lot size, product code, lens parameter information including power, cylinder, axis and expiration date (as an example for toric lenses), process time, a pallet status code for identifying an empty pallet or one that has passed, and a station code including codes indicating: Passed FC/BC Transfer and Load, Passed Tween Stamp, Passed Filling, Passed Deposition, Passed Pre Cure, Passed Pre Heat and Cure, Passed Demold Pre Heat and Demold, Passed Inspection, Passed FC Transfer and Hydration, Hydration &amp; Lens Transfer, and associated time stamp information at each station, etc. According to the invention, as shown in FIG. 3, the data record further includes the inspection result data, particularly in the form of a binary word representing the pattern of accepted/rejected lenses resulting from the lens inspection. As shown in FIG. 3( a ), for each transport structure  12   a ,  12   b , there is depicted a respective byte  17  including 8-bit positions corresponding to each of the lenses in the array, e.g., a 2×4 array for illustrative purposes. Each bit position of the byte  17  will have a bit value generated at the time of lens inspection at the lens inspection station. These values include either of “1”, for example, to indicate a good lens present at that lens position, or a bit value of “0”, for example, to indicate a rejected lens at that bit position. For example, for lens transport structure  12   a , the data conveyed for acceptable lenses at lens positions  1 - 4  will be “00011110”.  
         [0029]    Referring back to the flow chart of FIG. 2( a ), as further shown at step  106 , and in further view of FIG. 1, the lenses indicated as being rejected for that pallet are removed by the lens removal mechanism at the lens removal station  20 . Then, at step  109 , the transport structures are then conveyed to the lens transfer assembly  25  at the hydration station where the remaining acceptable lenses are to be transferred to a hydration tray  27  registered to receive the transfer of acceptable lenses according to the bit pattern information. Additionally, the lens position information is logically communicated to hydration station via the PLC.  
         [0030]    Referring back to FIG. 1, the lens fabrication transport structures or pallets  12  are conveyed serially in the direction indicated by an arrow “A”. To increase throughput in the lens fabrication system, the hydration tray  27  may accommodate an increased number of lenses, and for example, may comprise a 2×8 array of lens positions. These hydration trays  27  are indexed along a direction B and registered at a location indicated by a hydration tray  26  in a manner so as to facilitate the transfer of lenses thereto from the transport pallets. That is, under PLC control at the lens transfer assembly  25 , as depicted conceptually in FIG. 3( b ), lenses from lens positions  0 - 7  of transport structure  12   b  are simultaneously picked up and placed in corresponding positions  0 - 7  in hydration tray  27 . Concurrently, lenses from lens positions  0 - 7  of lens transport structure  12   a  are simultaneously picked up and placed in corresponding positions  8 - 15  in hydration tray  27 . According to the invention, as shown in FIG. 1, a corresponding data record  23  is logically formed as a result of lens transfer at the station  25  for subsequent conveyance in the system. This data record  23  maintains the two bytes  17  indicating presence of “good” lenses at positions according to the respective bit values indicated from the data records  13  for the lenses conveyed by the corresponding two 2×4 transport structures e.g.,  12   a ,  12   b  from FIG. 3( a ), with the first byte corresponding to positions  0 - 7  and the second byte corresponding to positions  8 - 15 .  
         [0031]    Referring back to the flow chart of FIG. 2( a ), as further shown at step  112 , the lenses are processed at the hydration station. Further details regarding the hydration process may be found in commonly-owned and issued U.S. Pat. No. 6,207,086 and in commonly-owned, co-pending U.S. patent application Ser. No. 09/252,307, filed Feb. 18, 1999, the contents and disclosure of each of which is incorporated by reference as if fully set forth herein. Generally, referring to the side elevation view of the hydration station  30  depicted in FIG. 4, and in accordance with the embodiment of the invention depicted in FIG. 1, the lens transfer operation at lens transfer station  25  includes a step of precisely operating a servo motor for aligning a mechanized lens transfer head  33  comprising a two lines of eight vacuum suction nozzles  34  each with the lens positions of the corresponding two 2×4 transport structures  12   a ,  12   b , activating a negative pressure manifold for enabling lens pick up at the respective lens locations therefrom, and aligning and transferring the individual lenses to respective positions on the hydration tray  26 . After the lenses are loaded into the hydration tray  26  they are conveyed to a location  28  of an elevator mechanism  42  of the hydration tower  35  where the tray is stacked and elevated vertically through the tower through a sequence of steps for receiving for various degrees of deionized water exposure. After hydration processing, as shown in view of FIG. 1, each tray  27  containing hydrated lenses is moved in the direction of arrow “C,” where they are lowered from the hydration tower by elevator mechanism  35  at a location  29  and conveyed in the direction of arrow “D” to a position  31  in registration with the lens unload station  55  where the hydrated lenses are to be intelligently transferred from the hydration tray to individual packages contained in the individually registered transport pucks.  
         [0032]    Referring back to FIG. 2( a ), after hydration step  112  and during the time the hydration tray containing hydrated lenses is lowered from the hydration tower  35  and registered for lens unload at transfer station  55  indicated at step  115 , the lens transfer bit pattern included with the electronic data record for that tray hydration  27  at position  31  is communicated to the intelligent puck transfer assembly  50  and lens load station  55  at step  118  so that the position of the good lenses remaining in the tray may be determined. With this information, as indicated at step  121 , the intelligent puck transfer assembly  50  is actuated for staging zero or more pucks in the appropriate position for lens transfer from the hydration tray  27 .  
         [0033]    More particularly, in accordance with the intelligent puck staging step  121  of FIG. 2( a ), the process for intelligent puck transfer and staging according to the principles of the invention is now described with respect to FIG. 5 which illustrates an example embodiment of the intelligent puck transfer and staging assembly  50  according to the principles of the invention. In operation, as shown in FIG. 5, a conveyor belt or like transport mechanism  60  conveys a series of pucks  52 , each comprising a previously loaded lens package  53  for receiving a lens to be loaded from the hydration tray at the lens load station  55 . The bit pattern information communicated from the hydration station associated with the hydration tray is utilized to register anywhere between 0 and 8 pucks at a lens load staging area  70  in the manner as follows: First, at the lens load station  55 , as shown in FIG. 4, a series of eight lens transfer nozzles  59  are utilized and individually activated to grab only the acceptable lenses from a respective row of the hydration tray  27 . Referring back to FIG. 3( b ), at the hydration station, the tray  27  is organized as a first row  37   a  comprising zero or more good lenses at positions  4 - 7  and  12 - 15  and a second row  37   b  comprising lenses at positions  0 - 3  and  8 - 11 . Utilizing bit shifting and masking techniques as would be within the purview of skilled artisans, the bit positions of the two bytes of information  17  maintained for that tray are communicated to the puck registration assembly  50  to enable the staging of individual pucks  52  for a subsequent lens transfer operation. According to an example embodiment, transfer of good lenses from the hydration tray is successively performed on a row-by-row basis such that, as shown in FIG. 3( b ), good lenses at positions indicated in row  37   a  are first transferred and then good lenses at positions indicated in row  37   b  are transferred. Thus, when transferring the good lenses at positions  47  and  12 - 15  of row  37   a  of the hydration tray, the bit position values of the known good lenses are mapped into a new 8-bit byte  57  at the puck transfer assembly as shown in FIG. 3( c ). Any of the 8-bit positions of puck staging byte  57  having a “1” are used by the puck transfer assembly  50  to enable registration of a puck  52  carrying an individual package into a corresponding position along the conveyor  90  of the lens load staging area  70 . More specifically, as shown in the intelligent puck transfer assembly  50  of FIG. 5, a servo-operated pin-wheel mechanism  80  comprising individual lugs  82  and a lug belt  90  comprising lugs  92  operating for indexed motion in a direction indicated by arrow “E” in conjunction with the pinwheel  80  cooperatively operate to stage zero or more pucks according to the pattern for the bit positions of each consecutive row  37   a ,  37   b . Thus, for example, if no lens is present at a position in the row  37   a , i.e., the bit pattern in byte  57  indicates a “0” at that row position, and the pinwheel and lug belt  90  will index forward without a puck release. However, if a lens is present at a position in the row  37   a , i.e., the bit pattern indicates a “1” at a row position, a puck is loaded to the pinwheel, engaged by the lug  82  of the pinwheel, and released by the pinwheel for registered movement along the lug belt  90 . It is thus understood that the lug belt  90  may receive up to 8 pucks at a time for staging according to the row bit pattern from hydration. As shown in FIG. 5, a puck  52   a  is shown released to the belt  90  in a position followed by two empty positions, indicating no lenses at the corresponding position in the hydration tray.  
         [0034]    Preferably, a series of sensors is utilized by the control system to ensure registered movement in accordance with the bit pattern associated with lenses to be loaded from the hydration tray. For instance, a first sensor  85  is provided for ensuring that a puck is present at the pinwheel  80 , a second sensor  87  is provided to ensure presence of a next puck so that the continuous indexing may be assured, and a third sensor  89  is provided to ensure that the puck has actually been released and engaged by a lug  92  for movement along the belt  90 . At the end of the cycle, i.e., after a byte corresponding to a hydration tray row has been processed, along conveyor  90  will be staged anywhere from zero to eight pucks in accordance with the 8-bit pattern of good lenses to be from transferred for a row from the hydration tray. After processing the eight bit pattern from hydration, these staged pucks are then pushed at once to a lens load position  71  formed as a row in the lens load station  55 . Particularly, a rake mechanism  95  under programmed control of an air cylinder  98  is activated to engage the lenses from the lug belt  90  and advance the lens pucks in their respective positions, in a direction indicated by an arrow “F” to the lens load position  71 . As shown in FIG. 5, for example, in an immediate prior cycle for a hydration tray row, only one puck  52   b  has been transferred to a corresponding lens load position  71  by the rake assembly  95 . It is understood that this position corresponds to a third nozzle position indicating possibly that the bit pattern for the prior hydration tray row transferred was “00000100”.  
         [0035]    Returning to FIG. 2( b ), step  125  indicates the step of pushing the staged pucks to the load lens position  71  as described with respect to FIG. 5. It should be understood that, after the staged pucks are pushed to the load lens position  71 , as indicated at step  128 , the puck staging sequence for the next row of lenses, e.g., row  37   b  in FIG. 3( b ), in the hydration tray is initiated. In one embodiment, as indicated at step  131 , FIG. 2( b ), while the puck staging sequence for the next row of lenses is performed, the lenses from the hydration tray corresponding to the row of pucks currently staged according to the transferred bit pattern for that row are picked and readied for transfer.  
         [0036]    Returning to FIG. 4, a lens transfer assembly  63  including eight in-line suction nozzle assembly  59  is extended, under servo-motor control, to the lens transfer position  31  at the hydration station  30  to pick up the lenses from the row of the hydration tray  37 . Thereafter, the lens transfer assembly  63  is retracted back to the lens transfer station  55  to register each lens transfer nozzle carrying a lens with a corresponding puck staged at the load position  71  according to the bit pattern for that row. Extended and retracted movement of the lens transfer assembly  63  including nozzle assembly  59  is shown indicated by the direction of arrow “G”. Once the pucks are staged at this lens load position, referring to FIG. 4, the lens transfer nozzles  59  are actuated to physically transfer the lens to the corresponding staged puck in row  71 . For the example embodiment shown in FIG. 5, only one lens transfer will take place to the puck  52   b  located in load position  71 . The step of physically transferring the hydrated lenses to the respective packages in the staged pucks is indicated at step  134 , FIG. 2( b ). A detailed explanation regarding the lens transfer mechanism may be found in commonly-owned, co-pending U.S. patent application Ser. No. 09/252,207 filed Feb. 18, 1999 and entitled CONTACT LENS TRANSFER AND MATERIAL REMOVAL SYSTEM (VTN-0418), the whole contents and disclosure of which is incorporated by reference as if fully set forth herein.  
         [0037]    As further shown in FIG. 2( b ) at step  138 , the pucks having lens transferred thereto are pushed to an exit conveyor belt for subsequent processing at the next contact lens fabrication station, e.g., a lens detect station. That is, referring back to FIG. 5, once the lenses have been loaded into a corresponding staged puck in lens transfer row  71 , the puck including package and loaded lens is pushed by rake mechanism  95  in the direction indicated by an arrow “F” to an exit conveyor mechanism  73  for carrying the pucks  52  including a lens package and a transferred hydrated lens. Preferably, the rake mechanism  95  is a dual-push assembly enabling simultaneous pushing of lenses staged by the lug belt  90  to the corresponding lens load position  71  while pushing pucks having packages loaded with lenses at the lens load station  71  to the exit conveyor  73 . For exemplary purposes, FIG. 5 shows a lens containing lens package carried by puck  52   c  having been pushed by rake  95  at a position for a previous hydration tray row. It is understood that the position of prior loaded package  52   c  corresponds to a first position indicating possibly that the bit pattern for the prior hydration tray row transferred was “00000001”.  
         [0038]    In a further step, as indicated in FIG. 3( c ), the PLC logically tracks the pucks that have been transferred to the exit conveyor belt  73 . Particularly, the plurality of pucks that have been transferred for subsequent processing according to the lens bit positions are tracked according to a 16 bit word  47  corresponding to the two rows of the hydration tray. Thus, as shown in FIG. 3( c ), the byte pattern corresponding to row  37   a  of the tray is mapped into bit positions  0 - 8  of the 16-bit word  47  while the byte pattern corresponding to row  37   b  of the tray is mapped into bit positions  8 - 15  of the 16-bit word  47 . In this manner, the 16 bit word is used to track the lens parameter, lot, status and other processing information for downstream lens fabrication processing/packaging.  
         [0039]    It should be understood that the intelligent lens transfer process as described with respect to FIGS.  2 ( a )- 2 ( b ) is a repetitive process, with processing of successive lens fabrications pallets and rows of hydration trays in the manner described herein. It should be understood, that the intelligent lens transfer scheme as described herein is performed even when lot changes are seamlessly effected in the manner described in commonly-owned, co-pending U.S. patent application Ser. No. 09/305,885 filed May 5, 1999.  
         [0040]    While the invention has been described in connection with a preferred embodiment, it is not intended to limit the scope of the invention to the particular form set forth, but on the contrary, it is intended to cover such alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims. For example, the concept of intelligent lens transfer according to the principles of the invention described herein may be used elsewhere for different applications. For example, if used elsewhere in the lens fabrication line, pucks do not necessarily have to be carrying packages, i.e., intelligent lens transfer could take place into hydration, if the hydration tray were comprised of individual “pucks” or some other individual carriers. Further, intelligent lens transfer may be at the back end after an inspection step, and not necessarily from a hydration tray to individual pallets for further processing, e.g., for operations such as applying a lens coating step or a step to add pigmentation to a lens, etc.

Technology Classification (CPC): 8