Patent Publication Number: US-10781050-B2

Title: System and method for processing of optical lenses

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is a division of commonly owned, co-pending U.S. patent Ser. No. 14/383,987, filed Sep. 9, 2014, which is a § 371 of PCT/EP2013/000693 filed Mar. 8, 2013. 
    
    
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     This invention relates to a system and method for processing of optical lenses. 
     Description of Related 
     The processing/machining of optical lenses takes place in several steps or in several separate processing apparatus. The processing/machining can comprise especially forming or cutting, polishing, coating, testing and measuring, marking, coating and/or cleaning. 
     Use of transfer systems for the transport of workpieces, especially of work holding-fixtures with the workpieces, to and from processing apparatus, is fundamentally known. 
     International Patent Application Publication WO 2008/042277 A1 discloses a system for processing of optical lenses, the system having different processing apparatus and a transfer system between the processing apparatus. A processing line for serial processing is formed. The lenses are therefore conveyed from one processing apparatus to the next processing apparatus until the lenses have passed through all processing apparatus. The processing apparatus and the transfer system with conveyor apparatus are controlled by a central computer or controller. 
     German Patent Application DE 41 07 084 A1 and corresponding U.S. Pat. No. 5,372,241 disclose an automatic conveyor system for transport of objects between production areas which each consist of one or more production stations of the same type and which are arranged with predetermined distances in two parallel rows. Furthermore, between the two parallel rows there is another conveyor apparatus for transport of objects between production areas remote from one another. In addition, between the individual production stations, there is another conveyor apparatus with a driverless shunting carriage with an assigned loading robot. The transfer system and the conveyor apparatus are controlled by a central control computer. 
     British Patent Application GB 1 567 587 A discloses a transfer system for workpieces in order to convey them alternately to two independently working processing apparatus by means of endless conveyor belts. 
     U.S. Pat. Nos. 6,039,899 and 6,071,440 disclose a system for casting and hardening of contact lenses. Pallets with front mold halves and pallets with rear mold halves are conveyed by separate belt conveyor apparatus to a transfer apparatus which transfers the pallets in alternation in the desired sequence to another belt conveyor apparatus. 
     International Patent Application Publication WO 2010/012364 A1 and corresponding U.S. Pat. No. 8,397,898 B2 disclose a system for sorting of goods in order to load the goods in an ordered sequence into a transport vehicle. 
     German Patent Application DE 10 2007 059 303 A1 discloses a system with a main conveyor belt which has at least two tracks revolving in the same direction. An outer track is used as an overtake track on which workpieces or work holding-fixtures which are not to be supplied to processing continue to be transported. Changing from one transport track to another transport track takes place by sliding vanes and assigned punches. Moreover, cross conveyors with conveyor belts which run in the opposite direction are assigned to each processing station, workpieces to be machined or work holding-fixtures being extracted via corresponding shunts from the main conveyor belt to the cross conveyors for processing in the respective processing apparatus. The known system requires a relatively large amount of space and also requires in addition to the main conveyor belt for each processing station two cross conveyor belts. This does not allow optimum progression of operations. German Patent Application DE 30 28 283 A1 and corresponding U.S. Pat. No. 4,544,318 disclose a similar production system. 
     In the processing/machining of lenses, it has been conventional to date to form a processing line from several processing apparatus which the lenses to be processed/machined pass through in succession. The processing line is then set in particular to certain processing or a lens shape. For different processing operations, for example, lenses which are to be processed/machined differently, either refitting must take place or a separate processing line is used. In the processing of different lenses this can result in that the rate of utilization of different processing lines is very uneven or that frequent refitting is necessary. The successive or linear passage through a given sequence of processing apparatus has the disadvantage that when one processing apparatus fails the processing must be stopped altogether. Furthermore the optimum rate of utilization of different processing apparatus, especially when they have different processing capacities, is not possible in conventional processing lines. Conventionally, all processing apparatus and conveyor apparatus are controlled by a central control. In particular, it is usually centrally established which processing apparatus machines which lens in which form. In existing processing lines expansion has therefore been very expensive to date. Conventionally, then complete rebuilding and reprogramming of the central control must be done. 
     SUMMARY OF THE INVENTION 
     The object of this invention is to devise a system for processing/machining of optical lenses and a method for processing/machining of optical lenses, optimized processing/machining and handling being enabled with high flexibility and/or a low space requirement especially also with consideration of different processing/machining speeds or capacities of different processing apparatus, especially expansion of the system being very easily possible. 
     This object is achieved by a system and method as described herein. 
     According to one aspect of this invention, each processing apparatus is assigned its own conveyor apparatus. Between the different processing apparatus with the assigned conveyor apparatus there are transfer apparatus. The transfer apparatus and the conveyor apparatus of the processing apparatus form a first transport track which runs especially at least essentially in a straight line. The transfer apparatus are made for accommodation and temporary interim storage and for continuous conveyance of at least one lens or lens carrier as required alternately to a following processing apparatus or conveyor apparatus or to a second transport track. Thus a compact structure and flexible processing are enabled. 
     According to another aspect of this invention, the conveyor apparatus assigned to one processing apparatus is integrated into the respective processing apparatus and/or (permanently) added to it. Especially preferably, the respective conveyor apparatus ends at least essentially flush or in the extension of one side of the processing apparatus. The length of the conveyor apparatus corresponds preferably at least essentially to the width of the respective processing apparatus. This is conducive to a compact structure of especially one system with several processing apparatus. 
     The transfer apparatus between the processing apparatus make it possible for a processing apparatus or the conveyor apparatus assigned to the processing apparatus to be able to be cleared again after completed processing of a lens or lens carrier. A processed/machined lens or a lens carrier with at least one processed/machined lens can continue to be conveyed specifically to the downstream transfer apparatus. The latter accepts the processed/machined lens or the lens carrier so that at this point the processing apparatus and its conveyor apparatus are free to accept the next lens or the next lens carrier from a transfer system, especially an upstream transfer apparatus. In this way idle times can be minimized and thus optimized use or optimized throughput can be achieved. 
     In particular, the transfer apparatus and the conveyor apparatus of the processing apparatus can be independently controlled and driven for independent conveyance of the lenses or lens carriers. Depending on the required processing, the conveyor apparatus can stop the respective lens or respective lens carrier for example, move it forward or if necessary even move it backward. This enables very high flexibility in the processing. Likewise, according to this invention, preferably a straight and/or continuous (first) transport track for the lenses or lens carriers is formed from the conveyor apparatus of the processing apparatus and from the transfer apparatus. This allows a compact structure. 
     The transfer apparatus are made preferably for alternate continued conveyance to a following conveyor apparatus and processing apparatus or to the second transport track, therefore respectively form preferably a shunt. Therefore, the transfer apparatus preferably allow changing from the first transport track to the second transport track. In particular, the transfer apparatus however also allows reversed changing from the second transport track to the first transport track. This allows a simple structure and a very flexible progression since lenses and lens carriers can change between the transport tracks as required. The second transport track can be used especially as a bypass track in order to be able to bypass individual processing apparatus. 
     The second transport track runs preferably parallel to the first transfer apparatus and/or at least essentially in a straight line. 
     The second transport track can be controlled preferably independently of the first transport track. 
     The second transport track is composed preferably of several conveyor apparatus which can be controlled and driven especially independently of one another and which form the second transport track in succession with transfer apparatus or change-over apparatus optionally located in between. This allows optimum conveyance, especially lenses or lens carriers being able to be conveyed or transported on a conveyor apparatus of the second transport track independently of the conveyance of other lenses or lens carriers on another conveyor apparatus of the second transport track. 
     Preferably, the transfer apparatus each have a receiving area for temporary interim storage of at least one lens or at least one lens carrier. Thus, a lens or a lens carrier can be accommodated and stored on an interim basis after prior processing in a processing apparatus. Alternatively, the lens or lens carrier can continue to be conveyed at a given time to another processing apparatus or to another transport track or conveyor apparatus of the transfer system. Alternatively or in addition, this accommodation or interim storage can also be used to accommodate another lens or another lens carrier by corresponding cross conveyance in addition from the transfer apparatus and to continue to convey it to a downstream processing apparatus or its conveyor apparatus (first). Then, the lens or lens carrier can continue to be conveyed out of the receiving area alternately to the downstream processing apparatus or to another conveyor apparatus or transport track. Accordingly, as required, very flexible processing is enabled. 
     Especially preferably, the transfer apparatus and their receiving area form corresponding receiving buffers for lenses or lens carriers. This makes it possible for other transfer apparatus or a second transport track or other transport tracks of the transfer system for example, to be able to essentially continuously convey. This enables a major simplification of control. 
     The second transport track and corresponding connections or cross conveyor apparatus between the first and second transport track, especially preferably between each processing apparatus, enable overtaking of lenses or lens carriers as necessary, for example, for processing of lenses with special priority, and/or bypass or selection of certain processing operations or processing apparatus. For example, a lens of polycarbonate can be conveyed to a processing apparatus which is set up or is especially well suited to this purpose, while a lens consisting of another material, for example, CR 39, can be conveyed to another processing apparatus which is set up or is especially well suited to this purpose. 
     According to one preferred aspect of this invention, the conveyor direction of the second transport track and/or of the transfer apparatus and/or of the conveyor apparatus of the processing apparatus can be reversed. This allows a compact structure and high flexibility in the processing. 
     According to another aspect of this invention, the transfer system preferably has in addition a third transport track for parallel conveyance, especially return, of lenses or lens carriers. In particular, the second and third transport tracks have conveyor directions which are opposite one another. The third transport track preferably runs at least essentially in a straight line and/or parallel to the other transport tracks. This allows a compact structure and optimized conveyance, and thus, optimized processing and rate of utilization of the processing equipment. 
     The third transport track is built preferably similarly or accordingly like the second transport track. Preferably, the third transport track is built out of several conveyor apparatus which are located in succession or in series with transfer or change-over apparatus located in between if necessary. The conveyor apparatus can preferably again be controlled independently of one another for independent conveyance of lenses or lens carriers. 
     Preferably, the changing apparatus are designed for changing between the second and third transport track or the transport tracks. The changeover apparatus can be formed by the transfer apparatus or separately or independently of them. 
     The change-over apparatus preferably have conveyor apparatus for cross conveyance of at least one lens or one lens carrier for changing between the second and third transport track or transport tracks. 
     Alternatively or in addition to the third transport track, the transfer system according to another aspect of this invention, has preferably a return conveyor connection for return or circulation of lenses or lens carriers. The return conveyor connection especially joins the first and second transport tracks, especially preferably in the area of the start and end and/or for formation of a circuit or the possibility of circular conveyance or circulation. 
     By means of the second transport track in conjunction with the third transport track and/or return conveyor connection, it is especially possible to start individual, several or all processing apparatus repeatedly and/or in any sequence, in particular therefore, to vary or optionally choose the sequence of processing operations, to vary or optimize the rate of utilization of the processing apparatus and/or to optimize the processing sequences. 
     The possibility of return by reversing the conveyor direction and/or via the third transport track or via the return conveyor connection simplifies in particular the expansion of the system in accordance with the invention. Other processing apparatus can be connected specifically easily to the end of the system or transport tracks via corresponding extensions of the transport tracks. Thus, for example, the capacity for certain processing operations can be increased as required by corresponding additional processing apparatus. These additional processing apparatus can then be supplied via the transport tracks if necessary with lenses or lens carriers or can be started. Then, preferably in turn, the transfer apparatus in accordance with the invention are located between the additional processing apparatus. After completed processing, in an additional processing apparatus if necessary, return can take place, for example, for further processing or for output, especially for example, to a delivery station of the original system. Consequently, no rebuilding or only minor rebuilding of the original system is necessary in an expansion. Accordingly, a very simple, prompt and economical expansion of the system in accordance with the invention is enabled. 
     According to one especially preferred aspect of this invention, the lenses or lens carriers are circulated or conveyed in a circuit, especially to store them on an interim basis and or to avoid congestion upstream of the processing apparatus. This takes place preferably in the second transport track in one direction and in the third transport track in the opposite direction, corresponding cross conveyances or cross connections between these two transport tracks being used to enable the desired circulation or circuit conveyance. Thus, these transport tracks can be used to store or store on an interim basis the lenses or lens carriers. Alternatively or in addition, in this way, unwanted congestion can be avoided. In particular, the lenses or lens carriers are extracted from the circuit or from circulation when a desired processing apparatus is available. The extraction takes place especially via corresponding cross conveyance and/or by a change to the first transport track or by a change to a transfer apparatus which is located upstream or assigned to the desired processing apparatus. 
     The transfer apparatus have preferably one conveyor apparatus at a time for longitudinal conveyance of at least one lens or one lens carrier parallel to one of the transport tracks and in addition a conveyor apparatus for cross conveyance of at least one lens or one lens carrier for changing the transport track. These conveyor apparatus can preferably be controlled independently of one another. This allows optimum conveyance, in particular the preferred temporary accommodation or interim storage of at least one lens or lens carrier especially on the conveyor apparatus for longitudinal conveyance taking place especially preferably in a receiving area upstream or downstream of the assigned conveyor apparatus for cross conveyance, the conveyor apparatus being made then relatively long for longitudinal conveyance. 
     The conveyor apparatus for cross conveyance of the transfer apparatus or change-over apparatus or parts or sections thereof can preferably be alternately raised and lowered by means of assigned lifting apparatus. Thus, if necessary, the cross conveyance can be used very easily when this is in fact needed. This applies especially when the conveyor apparatus are made as belt conveyors. 
     Preferably, the individual or all conveyor apparatus are made as belt conveyors. This allows a simple and economical structure and reliable conveyance of the lenses or lens carriers. 
     Especially preferably, the lenses are transported between the processing apparatus and from the transfer systems only by means of lens carriers or in lens carriers. 
     Lens carriers are especially preferably transport boxes. 
     The lens carriers preferably accommodate at least one lens at a time, especially two lenses or a pair of lenses, especially two spectacle glasses which belong together for spectacles. 
     According to another aspect of this invention, the system or the transfer system preferably has a preferably common or central control apparatus for control of the transfer apparatus, the conveyor apparatus of the processing apparatus being able to be controlled or driven by the respective processing apparatus or its machine control and especially independently of one another and/or independently of the transfer system or the transfer apparatus. This allows optimized, especially partially decentralized control. This can in particular result in the individual processing operations in the individual processing apparatus having priority and the transfer apparatus and other conveyor apparatus of the transfer system conveying the lenses or lens carriers to the processing apparatus or away from them only as necessary. Preferably, individual or several processing apparatus can automatically request or choose lenses or lens carriers for processing or have them conveyed, especially preferably independently of other processing apparatus and/or a central system control and/or a control apparatus, and for the processing necessary production and processing data, especially processing plans and processing statuses, lens data or the like can be retrieved if necessary from an especially central server, database system or the like or can be considered. This enables optimization of the processing sequence and is conducive to flexible processing. This further facilitates a simple and modular structure and an expansion of the system. 
     The transfer system or its components, such as the transfer apparatus, the optional change-over apparatus and/or the other conveyor apparatus (not the conveyor apparatus of the processing apparatus) are connected or can be connected preferably via a bus system to a control apparatus of the transfer system, for example, a memory-programmable control, and can be controlled via it. This enables a very simple structure and especially a very simple expansion of the system, especially the addition of other processing apparatus and a corresponding connection of other components to the transfer system. 
     Especially preferably, a cable with supply lines and control lines is used to which the conveyor apparatus or other components of the transfer system or the transfer apparatus and/or the processing apparatus can be connected. This facilitates a simple and modular structure or a simple connection and/or expansion of the system. 
     A method in accordance with the invention for processing is characterized especially in that the lenses or lens carriers with the lenses are alternately supplied to different processing apparatus for independent processing of the lenses, the lenses or lens carriers being conveyed independently by conveyor apparatus in the processing apparatus, the lenses or lens carriers being temporary accommodated by transfer apparatus between the processing apparatus and alternately continuing to be conveyed to the next processing apparatus or a parallel transport track. In doing so the transfer apparatus are controlled by a preferably central or common control apparatus, the conveyor apparatus of the processing apparatus conversely being controlled preferably by the respective processing apparatus or its machine control. This simplifies the control and allows especially optimized processing for the individual processing apparatus. Furthermore, in this way, expansion of the system and connection of other processing apparatus are greatly simplified. 
     In general, it is noted that the required processing steps and their sequence, in order to produce a processed/machined or finished lens from a lens or lens blank, are established in a so-called processing plan, but that for several processing apparatus for the same processing, for example, for polishing, the respective apparatus and thus the apparatus which are to be specifically used can be chosen. Independent processing by the processing apparatus should preferably be understood such that the processing in the respective apparatus proceeds independently of other processing operations and independently of the transfer system, however the sequence of the processing steps being dictated or maintained. The actual processing state is reflected in the processing status which in particular indicates which processing has already been completed or is to take place next, this taking place especially preferably with reference to the corresponding processing plan for the respective lens. 
     Alternatively or additionally, independent processing by the processing apparatus should preferably be understood such that the processing apparatus choose or request or deliver the lenses to be processed/machined or the lens carriers with lenses to be processed/machined automatically or independently of a central control, especially preferably with consideration of the required processing. This selection can alternatively take place in one logic plane or in the physical plane. In selection in the logic plane, the respective processing apparatus can select, for example, a job or a data set with information about a lens to be processed/machined from a data storage, database server, a system control or the like and then (have) this lens or the corresponding lens carrier with this lens conveyed. For choice in the physical plane a processing apparatus can detect or identify for example, lenses to be processed/machined or lens carriers with lenses to be processed/machined especially by means of a sensor or the like and with consideration of the respective job or data set with information on the required processing can choose a suitable lens or a corresponding lens carrier and have it conveyed to processing. This results in at least largely autonomous processing of lenses by the individual processing apparatus so that especially when systems are expanded an otherwise necessary very expensive reprogramming or new programming of central controls can be entirely omitted or at least minimized. 
     Therefore, one aspect of this invention lies especially in that the processing apparatus work at least as much as possible largely automatically or independently, so that especially preferably the processing apparatus retrieve or request lenses or lens carriers individually from the transfer system in order to carry out required processing and afterwards return the processed/machined lens(es) to the transfer system again, therefore inject them again into the conveyor or conveyor circuit. This independence of the processing apparatus greatly simplifies the incorporation of additional or new processing apparatus into the system. 
     In a processing apparatus which works independently in the aforementioned sense, it is important who gives the command that a new lens or a new lens carrier must be requested or loaded. 
     According to one preferred embodiment, the transfer system preferably has a sensor, for example, a bar code reading station or the like for lenses or lens carriers and communicates to an assigned processing apparatus, after corresponding detection and optionally evaluation, an identification or directly the processing status of a detected lens or of a detected lens carrier. The processing status can be optionally interrogated or gauged or ascertained using a central data storage, a central database, a central system control or the like. The processing apparatus can then automatically request or (have) the detected lens or the detected lens carrier delivered, to the extent the processing apparatus can carry out the processing required (next). In this type of request of lenses to be processed/machined already existing processing apparatus need not be updated or receive any special message when new or additional processing apparatus are being incorporated into the system and/or additional processing cycles are being scheduled. Rather, here, the production flow or the conveyance of lenses/lens carriers is controlled especially by a central control apparatus, especially by a so-called belt supervisory computer, of the transfer system—therefore of the belt or conveyor system—and/or by a system control of the system, in particular in this way the conveyance of the lenses or lens carriers along the processing apparatus is controlled or influenced. 
     According to one version, the processing apparatus has its own sensor, especially a bar code reading station or the like for detection and optionally identification of lenses or lens carriers. In this case, the processing apparatus can retrieve or request a detected lens or a detected lens carrier especially by direct triggering of a corresponding conveyor apparatus, transfer apparatus, change-over apparatus or the like if the respective processing apparatus can carry out the required processing. After completed processing, the processing apparatus changes the processing status of the lens or lens carrier, especially in a central database, system control or the like and delivers the machine lens or lens carrier back to the transfer system. In this version the processing apparatus can be independent and self-contained such that they control the production flow or the conveyance of the lenses or lens carriers. In this case, the respective conveyor apparatus must recognize the other conveyor apparatus on the transfer system or the system and likewise the processing plan—therefore, the processing sequence—must be known to it. When new processing apparatus are added and/or when the processing plan changes, this must be communicated to each processing apparatus or must be filed or made accessible in a corresponding central database, system control or the like. 
     Individual ones of the aforementioned and following aspects and features of this invention can be optionally combined with one another, but can also be implemented independently of one another. 
     Other aspects, features, advantages and properties of this invention will become apparent from the following description of preferred exemplary embodiments with reference to the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic side view of a system in accordance with the invention with several processing apparatus and transfer apparatus which are located in between; 
         FIG. 2  shows a schematic of a lens carrier with lenses which are to be machined; 
         FIG. 3  is a plan view of a transfer apparatus of the system in accordance with the invention in an extract enlargement from  FIG. 1 ; 
         FIG. 4  is a plan view of a change-over apparatus of the system in accordance with the invention for changing between transport tracks in an extract enlargement from  FIG. 1 ; 
         FIG. 5  is a schematic side view of the system in accordance with the invention according to another exemplary embodiment; 
         FIG. 6  is a schematic representation of the system in accordance with the invention according to a further exemplary embodiment; 
         FIG. 7  is a schematic side view of the system in accordance with the invention according to still another exemplary embodiment; 
         FIG. 8  is a schematic representation of the system in accordance with the invention according to a further exemplary embodiment; and 
         FIG. 9  is a schematic block diagram of a preferred control structure of a system in accordance with the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     In the figures, the same reference numbers are used for the same or same type of components and apparatus, the same or corresponding advantages and properties arising even if a repeated description is omitted. 
       FIG. 1  is a schematic representation of a device or system  1  in accordance with the invention for processing/machining of optical lenses  2 , therefore a lens processing system. Primarily, the processing/machining of lenses for eyeglasses or of spectacle glasses is explained below as an especially preferred exemplary embodiment. Preferably, however, these details also apply accordingly to the processing/machining of other lenses  2  or more generally optical workpieces. 
     The system  1  has several separate processing apparatus  3  for independent processing/machining of lenses  2 . For example, the system  1  can have especially at least one processing apparatus  3 A for blocking (temporary connection to a holder) of lenses  2 , a processing apparatus  3 B for intermediate storage of lenses  2  (preferably for cooling after blocking), a processing apparatus  3 C for forming, especially cutting or milling of lenses  2 , a processing apparatus  3 D for polishing of lenses  2 , a processing apparatus  3 E for testing or measuring of lenses  2 , a processing apparatus  3 F for marking of lenses  2  and/or a processing apparatus  3 G for coating of lenses  2  (indicated in  FIG. 5 ). 
     If necessary there can also be several identical processing apparatus  3 , for example, two or more processing apparatus  3  for the same processing/machining or they can be integrated into the system  1 . For example, there can be several processing apparatus  3 C for forming, several processing apparatus  3 D for polishing, etc. This depends especially on the throughput of the different processing apparatus  3  and/or the desired processing operations. One special advantage of the system  1  in accordance with the invention consists specifically in that additional processing apparatus  3  can also be very easily incorporated or integrated into the system  1  later as required. Expansions can also take place very easily. 
     The system  1  has preferably a transfer system  4  for transport of lenses  2  or lens carriers  5  with the lenses  2  to and from the processing apparatus  3 . The transfer system  4  feeds the lenses  2  or lens carriers  5  especially to the processing apparatus  3  and/or transports or conveys the lenses  2  or lens carriers  5  after completed processing/machining in one processing apparatus  3  to another processing apparatus  3  or to a delivery station  6 . The delivery station  6  can be made for example, as a transfer apparatus, roll table or as some other storage apparatus. 
     In addition to the delivery station  6 , the system  1  also preferably has a receiving station  7  which is used to accommodate lenses  2  to be processed/machined or lens carriers  5  which bear the lenses  2  to be processed/machined. 
     The delivery station  6  in the illustrated example is located preferably separately from the receiving station  7 , for example, on an opposite side. But, the receiving station  7  and the delivery station  6  can also necessarily be located next to one another or adjacent, as indicated in  FIG. 1  by the delivery station  6 ′ which is shown in addition as an alternative next to the receiving station  7  and/or can be formed by a common apparatus or the like and/or can be located at any locations on the transfer system  4 . 
     Each processing apparatus  3  is assigned preferably its own conveyor apparatus  8  for especially linear conveyance of at least one lens  2  or one lens carrier  5 . In particular, the assigned conveyor apparatus  8  is integrated or installed in the respective processing apparatus  3  or is added to it. The conveyor apparatus  8  is made preferably as a conveyor belt. 
     The conveyor apparatus  8  of the processing apparatus  3  are each controlled by the respective processing apparatus  3  or its machine control (not shown in  FIG. 1 ). 
     Especially preferably, the processing apparatus  3  are made as compact as possible or at least essentially cuboidal or with a rectangular base area, the conveyor apparatus  8  being located preferably in the back, therefore on one side which is opposite a control or operating panel  17  of the processing apparatus  3 , or on one narrow side of the respective processing apparatus  3 . But fundamentally, another arrangement, in particular on a longitudinal side of the respective processing apparatus  3 , is possible. 
     Especially preferably, the conveyor apparatus  8  do not project laterally or do so only slightly above the respective processing apparatus  3  and/or by a uniform amount. In particular the length of the conveyor apparatus  8  corresponds at least essentially to the width of the respective processing apparatus  3 . 
     Preferably, the passage width between adjacent processing apparatus  3  is fixed by a transfer apparatus  9  which is located in between; this will be detailed below. The passage width is, for example, roughly 60 cm. A passage between adjacent processing apparatus  3  is especially necessary or desirable for maintenance or repair purposes and/or also for refilling of consumables or the like. 
     The processing apparatus  3  are preferably set up or located next to one another so that the conveyor apparatus  8  run essentially in one line or lie behind one another and/or form a first transport track T 1  which is preferably at least essentially straight (indicated by the dot-dash line in  FIG. 1 ). 
     It is noted that the first transport track T 1  and/or a second transport track T 2  also correspond to a traverse, therefore can be built up out of different straight lengths or sections and can for example, run diagonally or in a U shape. Along these sections preferably several processing apparatus  3  at a time are arranged in a row such that these processing apparatus  3  with their conveyor apparatus  8  are located along this length or this section. This leads to great flexibility in expansion(s) of the system  1  in accordance with the invention, since in particular more or less any extensions, especially when adding to or expanding the system  1 , are enabled especially by incorporating additional processing apparatus  3  and/or for corresponding enlargement of the transfer system  4 . 
     The transfer system  4  has preferably transfer apparatus  9  which are each located between two adjacent processing apparatus  3  (of one row). Preferably the transfer apparatus  9  are located between some or all (directly) adjacent processing apparatus  3 . 
     The transfer apparatus  9  are preferably each made for accommodating and temporary intermediate storage of at least one lens  2  or one lens carrier  5  and moreover for continued conveyance of this lens  2  or this lens carrier  5  as necessary alternately to the conveyor apparatus  8  of a following processing apparatus  3  or to a second transport track T 2  of the system  1  or of the transfer system  4 . 
     The second transport track T 2  runs preferably like the first transport track T 1  at least essentially in a straight line or polygonally and/or parallel to the first transport track T 1 . 
     The receiving station  7  is made preferably for accommodating lenses  2  to be processed/machined or lens carriers  5  with the lenses  2  to be processed/machined. The receiving station  7  can be made especially such that it outputs the lenses  2  to be processed/machined or the lens carriers  5  alternately to the transport track T 1  or T 2 . 
     The transfer system  4  has preferably several conveyor apparatus  10  which are arranged especially in a row or in succession in order to form the second transport track T 2 . The lenses  2  or lens carriers  5  can therefore be transported or conveyed along this second transport track T 2  by means of one or more conveyor apparatus  10 . 
     The conveyor apparatus  10  of the second transport track T 2  can preferably be controlled independently of one another in order to be able to convey lenses  2  or lens carriers  5  independently of one another or in sections also along the second transport track T 2 . For example, a lens  2  or lens carrier  5  can be stopped on a conveyor apparatus  10  while another lens  2  or another lens carrier  5  continues to be conveyed on another conveyor apparatus  10  of the second transport track T 2 . 
     Due to the preferably segmented or sectional structure of the second transport track T 2  and due to the use of independently controllable conveyor apparatus  10  for the second transport track T 2 , it is also possible for individual conveyor apparatus  10  to convey opposite the conveyor direction F 1  of the first transport track T 1 , therefore backwards, while other conveyor apparatus  10  of the second transport track T 2 , for example, are stopped or continue to convey forward. 
     Alternatively, or in addition to the different control of conveyor apparatus  10  of the second transport track T 2  and/or conveyance backward, individual lenses  2  or lens carriers  5  can also be stopped by corresponding stopping apparatus or the like (see, for example, stopping apparatus  18  in the transport track T 2  in  FIG. 3 ) so that, in this case, the conveyor apparatus  10  can be operated further or continuously. This applies preferably to some or all transport tracks or conveyor apparatus. 
     Between the conveyor apparatus  10  of the second transport track T 2 , there can be transfer apparatus  9  if necessary. But, the transfer apparatus  9  can alternatively also convey directly onto an assigned conveyor apparatus  10  of the second transport track T 2 . In this case, the conveyor apparatus  10  can be located in succession without the interposition of transfer apparatus  9 , as indicated in  FIGS. 1 and 3 . 
     The conveyor direction of the first transport track T 1  is indicated in  FIG. 1  by an arrow F 1 . The second transport track T 2  conveys preferably in the same direction as indicated by arrow F 2 . The second transport track T 2  is used especially for the lenses  2  or lens carriers  5  to be able to be conveyed past individual processing apparatus  3 . For example, this conveying past can be desirable or necessary for a better rate of utilization of processing apparatus  3 , for conveyance to a certain processing apparatus  3  for special processing, due to a failure or based on the rate of utilization of a processing apparatus  3 , or due to unnecessary processing by a processing apparatus  3 . Alternatively, or in addition, the conveying past can also be used for overtaking of other lenses  2  or lens carriers  5 , for example, when priority processing of a certain lens  2  or several certain lenses  2  is to take place. 
     Preferably, the lenses  2  or lens carriers  5  can change between the first and second transport track T 1 , T 2  by means of the transfer apparatus  9 . In particular, this change-over is possible between each of the processing apparatus  3  and/or by means of each transfer apparatus  9  and/or in any direction, therefore from the first to the second transport track T 1 , T 2  and vice versa. 
     The system  1  or the transfer system  4  has preferably a third transport track T 3  which runs preferably at least essentially in a straight line and/or parallel to the other transport tracks T 1  and T 2 . 
     The conveyor direction F 3  of the third transport track T 3  is preferably directed opposite the conveyor directions F 1  and F 2  of the other transport tracks T 1  and T 2  or runs preferably backwards. Therefore, the transport track T 3  is used especially for return or opposite conveyance of lenses  2  or lens carriers  5 , for example, for re-insertion (via corresponding change-over possibilities) into the first or second transport track T 1 , T 2  for further processing or for return for example, to the delivery station  6 ′. 
     The third transport track T 3  is preferably built correspondingly or similarly to the second transport track T 2 , especially preferably out of several conveyor apparatus  10  which are arranged in a line or in succession, as indicated in  FIG. 1 . The conveyor apparatus  10  of the third transport track T 3  can preferably be driven or controlled again independently of one another so that independent conveyance of lenses  2  or lens carriers  5  along the third transport track T 3  is possible, as was already described above fundamentally for the second transport track T 2 , so that the details in this respect apply especially accordingly or in a supplementary manner. 
     Alternatively, or in addition to the different control of conveyor apparatus  10  of the third transport track T 3  and/or to conveyance backward, individual lenses  2  or lens carriers  5  can also be stopped by corresponding stopping apparatus or the like (not shown) so that in this case the conveyor apparatus  10  can be operated further or continuously. 
     The system  1  or the transfer system  4  has preferably change-over apparatus  11  for changing between transport tracks T, especially between the second transport track T 2  and the third transport track T 3 , therefore alternately from the second transport track T 2  to the third transport track T 3  and vice versa. The change-over apparatus  11  can be located in the two transport tracks T 2  and T 3  between the conveyor apparatus  10 . In this case, the change-over apparatus  11  are also used for certain continued conveyance in the direction of the respective conveyor direction F 2  or F 3 , therefore for longitudinal conveyance. Alternatively, the change-over apparatus  11  can also be integrated into assigned conveyor apparatus  10  or interact with them such that the change-over apparatus  11  are used only for cross conveyance, therefore solely for conveyance between the respective transport tracks T 2  and T 3 . This type of integration is preferable and is shown in the illustrated example. 
     The transfer apparatus  9  in the illustrated example are integrated preferably accordingly into the second transport track T 2  or into the assigned conveyor apparatus  10  of the second transport track T 2 . In other words, the transfer apparatus  9  in the illustrated example preferably do not effect longitudinal conveyance or continued conveyance in the second transport track T 2  in the conveyor direction F 2 . 
     The change-over apparatus  11  and the transfer apparatus  9  can also be located combined or in extension or can form a unit as is indicated by way of example in  FIG. 1  in the region of the delivery station  6 . 
     Alternatively, all or individual transfer apparatus  9  or change-over apparatus  11  can also be made such that they additionally enable alternate cross conveyance as far as to the optional transport track T 3  and/or a necessary change-over between all transport tracks T 1  to T 3  or between the transport tracks T 1  and T 3 . 
     Preferably, the system  1  in the region of one end or of the delivery station  6 , especially when the latter is spatially separate from the feed station  7 , has an assigned transfer apparatus  9  and/or change-over apparatus  11 , as indicated in  FIG. 1 . 
     Preferably, change-over apparatus  11  are located in the region of the start and end of the third transport track T 3  and/or one or more in between, especially to enable a circuit or circulation or circular conveyance K of lenses  2  or lens carriers  5  as indicated in  FIGS. 5-7 . 
     The system  1  or the transfer system  4  preferably has a transfer control or control apparatus  12 —especially a memory-programmable control—for control of the transfer apparatus  9  and/or conveyor apparatus  10  as well as, if present, change-over apparatus  11  and optionally, the receiving station  7  and/or delivery station  6 , as indicated in  FIG. 1 . Connection takes place especially preferably via a bus system  13  which is indicated in  FIG. 1  by the broken line. In particular, power supply and/or control takes place via the bus system  13 . Especially preferably, the bus system  13  has a bus cable which contains all supply lines and/or control lines. 
     In an expansion of the system  1 , other components, such as transfer apparatus  9 , conveyor apparatus  10  or change-over apparatus  11  can be easily connected directly to the bus system  13  or bus cable. Accordingly, expansion of the system  1  or of the transfer system  4 , optionally also rebuilding, is very easily possible. 
     Preferably, therefore, common or central control of the transfer system  4  takes place. The conveyor apparatus  8  assigned to the processing apparatus  3 , however, preferably does not form part of the transfer system or of the transfer control. Instead, the conveyor apparatus  8  of the processing apparatus  3  are controlled preferably by the processing apparatus  3  themselves or directly or by their machine controls (compare machine controls  20  in  FIGS. 6 and 7 ). The conveyor apparatus  8  are accordingly connected preferably to the assigned processing apparatus  3  or their machine control  20  for control of the respective conveyor apparatus  8 . 
       FIG. 2  shows in a schematic plan view one preferred embodiment of a lens carrier  5  for accommodating at least one, in the illustrated example, especially two or more lenses  2  to be processed/machined. In lens processing/machining or processing/machining of spectacle glass, conventionally, two lenses  2  to be processed/machined or a pair of lenses are received/accommodated by one lens carrier  5 . This is also preferred here. 
     The lens carrier  5  has preferably coding  5 A, for example, a bar code or the like with important processing/machining data, data for identification and/or other information for the two lenses  2 , or for each lens  2  has separate coding  5 A, as indicated in  FIG. 2 . Especially preferably, the coding  5 A contains an identification or job number or the like for the respective lens(es)  2  so that by means of the identification or job number a processing plan and/or processing status or required processing steps, processing sequences, processing data and/or other information can be determined or can be retrieved therefrom, for example, via a corresponding server system, database system or the like, especially a system control  21 , as indicated in  FIG. 6 . 
     Preferably, the distance of the lenses  2  in a lens carrier  5  is exactly as great as the distance of one lens  2  in one lens carrier  5  to the adjacent lens  2  in a directly adjacent lens carrier  5 . This simplifies handling or positioning, especially in the processing apparatus  3 . This distance is preferably 130 mm in the illustrated example. The length of the lens carrier  5  is preferably twice that, therefore here 260 mm. 
     The lens carrier  5  in the illustrated example is made preferably box-shaped and/or at least essentially square in a plan view. 
     In the illustrated example, the lens carrier  5  has preferably additional storage or receiving sites, for example, for tools, especially polishing tools, as indicated by broken lines in  FIG. 2 . 
       FIG. 3  shows in a schematic or enlargement of  FIG. 1  one preferred structure of a transfer apparatus  9  in accordance with the invention. The transfer apparatus  9  has preferably a (first) conveyor apparatus  14  for longitudinal conveyance (conveyance in the direction F of the transport track T, especially of the first transport track T 1 ) and a (second) conveyor apparatus  15  for cross conveyance (conveyance transversely or perpendicularly to the conveyor direction F or transport tracks T or to the transport track change). 
     The conveyor apparatus  14 ,  15  are preferably made as belt conveyors similar to the conveyor apparatus  8  and/or  10 . In the illustrated example, the conveyor apparatus  10  preferably have belts  10 A and assigned drives  10 B. The conveyor apparatus  14  have preferably belts  14 A and assigned drives  14 B. The conveyor apparatus  15  preferably have belts  15 A and assigned drives  15 B. 
     By means of the belts  10 A,  14 A,  15 A, which can be driven by the assigned drive  10 B,  14 B or  15 B, lenses  2  or lens carriers  5  lying on them can be conveyed linearly in the respective conveyor direction F or transversely thereto in cross conveyance. 
     The transfer apparatus  9  is preferably made for accommodation and temporary storage of at least one lens  2  or one lens carrier  5 , and for this purpose, has especially a storage or receiving area  19 , as is shown in  FIG. 3  by the broken line. It is formed in the illustrated example preferably by the conveyor apparatus  14  which has a length which is sufficient for this purpose. In particular, the length of the conveyor apparatus  14  is at least the single length of a lens carrier  5 , in the illustrated example, even at least twice the length of the lens carrier  5  in order to be able to accommodate or store it on an interim basis preferably next to or in the conveyor direction F 1  upstream or downstream of the conveyor apparatus  15  for cross conveyance or its lifting table  15 C. To do this the receiving area  19  is assigned preferably a suitable stopping apparatus  18  (for example, with a stop which can be folded or moved in the path of motion or an isolator) for necessary stopping of the lens carrier  5  or one lens carrier  5  in the receiving area  19 . The stopping apparatus  18  can stop a lens carrier  5 , here in the receiving area  19 , especially also as the conveyor apparatus  14  continues to travel. 
     In this connection, it is noted that stopping of the lens carrier  5  preferably, in general, takes place by means of corresponding or similar stopping apparatus  18  (such as shown for example, in the second transport track T 2  in  FIG. 3 ) at the desired sites or positions of the transfer system  4  and/or of the conveyor apparatus  8  in order to be able to stop the lens carriers  5  individually or exactly, optionally also as the conveyor apparatus  8 ,  10 ,  14  and/or optionally  15  or belts continue to travel. 
     Preferably, the system  1  or the transfer system  4  or the respective conveyor apparatus  8 ,  10 ,  14 ,  15 , transfer apparatus  9  and/or change-over apparatus  11 —in particular, in addition to the stopping apparatus  18  or the aforementioned stopping apparatus which are not shown, has suitable sensors  16 , such as photoelectric barriers, bar code readers or the like, especially to detect the presence of lenses  2  of lens carriers  5  or their position and/or to correctly position the lens carriers  5  and/or to detect or identify the lenses  2  or lens carriers  5 , especially preferably to be able to read codings  5 A. 
     In the illustrated example the length of the conveyor apparatus  14  or of the transfer apparatus  9  in the conveyor direction F 1  corresponds at least essentially to the distance of adjacent processing apparatus  3  or adjacent conveyor apparatus  8  or the passage width between adjacent processing apparatus  3 , as already mentioned, or at least the length of two lens carriers  5 . 
     It is noted that the processing apparatus  3  are preferably generally set up at least with essentially the same spacing. Accordingly, preferably identical transfer apparatus  9  can be inserted or located in between. 
     The conveyor apparatus  15  for cross conveyance, as indicated in  FIG. 3 , in the transfer apparatus  9 , according to the illustrated example, has preferably an intermediate conveyor with belts  15 D between the two transport tracks T 1 , T 2  and between the conveyor apparatus  14  and the adjacent conveyor apparatus  10 . 
     The conveyor apparatus  15  preferably has a common drive  15 B for driving the belts  15 A and, if present,  15 D. 
     The belts  15 A are preferably arranged in pairs between the belts  14 A of the conveyor apparatus  14  and the belts  10 A of the conveyor apparatus  10  and are each carried preferably by a lifting element, especially a lifting table  15 C. 
     The lifting element or the lifting table  15 C and the lifting elements/lifting tables  15 C, and thus, the assigned belts  15 A, can preferably be raised and lowered as necessary preferably by means of an assigned lifting apparatus (not shown). 
     In operation, the conveyor apparatus  14  can accommodate a lens carrier  5  from an upstream processing apparatus  3  and can temporarily store it, especially in the receiving area  19  and/or over the lifting table  15 C or over the belts  15 A. If necessary, the transfer apparatus  9  or its conveyor apparatus  14  can continue to convey the lens carrier  5  to the downstream processing apparatus  3  or deliver it again. Alternatively, the transfer apparatus  9  or its conveyor apparatus  15  can change the lens carrier  5  to the transport track T 2 , therefore can convey it crosswise. In this case, the lifting table  15 C is raised until the lens carrier  5  (not shown in  FIG. 3 ) is raised off the belts  14 A of the conveyor apparatus  14 . Then, the lens carrier  5  is conveyed by means of the belts  15 A—in the illustrated example via the optional intermediate conveyor or the belts  15 D—to the second transport track T 2  or onto the belts  15 A there. Preferably, the lifting table  15 C in the transport track T 2  or in the conveyor apparatus  10  is also always raised at the same time or in the same way for cross conveyance. A preferred lateral stop  15 E, which projects laterally upward over the conveyor apparatus  10  or its belts  10 A, prevents the lens carrier  5  from being conveyed too far in the crosswise direction or the lens carrier  5  from being conveyed laterally beyond the conveyor apparatus  10 . 
     Then, the conveyor apparatus  15  or its lifting tables  15 C is or are lowered again, and thus, the lens carrier  5  is transferred to the conveyor apparatus  10  or deposited on its belts  10 A so that at this point conveyance can take place along the second transport track T 2  by means of the conveyor apparatus  10 . 
     In the illustrated example, the conveyor apparatus  15  for cross conveyance is integrated into the conveyor apparatus  10  for longitudinal conveyance since there is no separate conveyor apparatus for longitudinal conveyance of the transfer apparatus  9  in the second transport track  10 , in contrast to the conveyor apparatus  14  for longitudinal conveyance of the transfer apparatus  9  in the first transport track T 1 . But fundamentally this additional conveyor apparatus  14  of the transfer apparatus  9  can also be fundamentally provided in the second transport track T 2 . 
     The transfer apparatus  9  can be used not only for changing the lens carrier  5  from the first transport track T 1  to the second transport track T 2 , but of course also for the reverse change, especially for injecting a lens  2  or a lens carrier  5  into the transport track T 1  for processing/machining in a following processing apparatus  3 . In this case the lens carrier  5  is positioned by the second transport track T 2  or the assigned conveyor apparatus  10  via the conveyor apparatus  15  for cross conveyance or its lifting table  15 C in the second transport track T 2 . Positioning takes place preferably by means of a stopping apparatus  18 , for example, by means of the stopping apparatus  18  which is shown by the broken line, and which is located especially in the second transport track T 2  or following the lifting table  15 C. 
     Subsequently, the lifting of the transport tables  15 C and then the cross conveyance to the transport track T 1  can take place by corresponding driving of the belts  15 A,  15 D by means of the drive  15 B until the lens carrier  5  is positioned on the conveyor apparatus  14 , and the receiving area  19  can also be occupied by another lens carrier  5  since the receiving area  19  is located preferably next to or especially upstream or downstream of the conveyor apparatus  15 . The positioning of the lens carrier  5  which has been conveyed crosswise in the transport track T 1  can in turn by facilitated or fixed by an optional lateral stop  15 E. 
     The transfer apparatus  9  is used preferably both for injection of lenses  2  or lens carriers  5  into the first transport track T 1  and also for extraction of lenses  2  or lens carriers  5  from the transport track T 2  into another transport track, here the second transport track T 2 . 
     The transfer apparatus  9  is especially made such that a lens  2  or a lens carrier  5  can be cross-conveyed or injected into the first transport track T 1  while another lens  2  or another lens carrier  5  is located in the receiving area  19  or is stored there on an interim basis. Thus lenses  2  or lens carriers  5  can also be injected between other lenses  2  or lens carriers  5  in the first transport track T 1 . 
     Furthermore the transfer apparatus  9 , as already indicated, allows alternate continuous conveyance of a lens  2  or a lens carrier  5  from the previous processing apparatus  3  (in the first transport track T 1 ) or out of the receiving area  19  to the next processing apparatus  3  and also extraction or cross conveyance from the first transport track T 1  to another transport track T, here the second transport track T 2 . In particular, the transfer apparatus  9  therefore forms a shunt with the especially upstream receiving area  19  for intermediate storage. 
     Since the transfer apparatus  9  is made preferably also for the already mentioned injection of lenses  2  or lens carriers  5  into the first transport track T 1 , the transfer apparatus  9  forms in particular a versatile shunt which proceeding from the first conveyor direction F 1  enables branching for cross conveyance for extraction and also injection especially via the same cross conveyance with the opposite direction and for continued conveyance in the first conveyor direction F 1 . Thus a very versatile, compact structure is enabled. 
     It should be noted that the transfer system  4  or the second transport track T 2  enables preferably stopping of lenses  2  or lens carriers  5  prior to cross conveyance of the transfer apparatus  9 , especially for injection into the second transport track T 2 , for example, in one upstream stopping area  24  at a time, as indicated by the broken line in  FIG. 3 , in particular by means of an assigned stopping apparatus  18  or the like, so that undisrupted injection of lenses  2  or lens carriers  5  into the second transport track T 2  can take place. 
     Preferably a sensor  16  for detecting or identifying lenses  2  or lens carriers  5  in the stopping area  24  is assigned to the stopping area  24 . 
     Preferably sensors  16  are also assigned to the lifting tables  15 C or are located in the region of the conveyor apparatus  15  of the first and/or second transport track T 1  and T 2  respectively in order to be able to identify or detect lenses  2  or lens carriers  5  there. 
     Preferably at least one sensor  16  which is assigned to one transfer apparatus  9  and/or to the receiving area  19  and/or the stopping area  24  is assigned to the downstream processing apparatus  3  so that arriving lenses  2  or lens carriers  5  can be detected and preferably identified via this sensor  16  or these sensors  16  in order to be able to recognize and if necessary request lenses  2  suitable for processing/machining in the assigned processing apparatus  3 —in particular with recourse to or consideration of the processing/machining plan and processing/machining status of the respective lens  2 . 
       FIG. 4  shows in a schematic enlarged view of  FIG. 1  a preferred structure of a change-over apparatus  11 . The change-over apparatus  11  preferably has a conveyor apparatus  15  for cross conveyance similarly to the conveyor apparatus  15  of the transfer apparatus  9  so that reference is made to details in this respect. In contrast to the conveyor apparatus  15  of the transfer apparatus  9 , the conveyor apparatus  15  of the change-over apparatus  11  preferably does not have or has a much smaller intermediate conveyor, in particular since the two transport tracks T 2  and T 3  lie very close or (much) closer next to one another than the transport tracks T 1  and T 2 , the spacing is therefore preferably smaller. For the change-over apparatus  11  therefore the drive  15 B of the conveyor apparatus  15  is preferably not located between the assigned transport tracks T 2  and T 3 , but preferably laterally, in particular on the transport track T 2  toward the transport track T 1 . 
     For reasons of simplification,  FIG. 4  does not show the lifting apparatus for the lifting tables  15 C. But the lifting elements or lifting tables  15 C and thus the belts  15 A of the conveyor apparatus  15  for the change-over apparatus  11  can preferably be raised and lowered accordingly, as is the case in the transfer apparatus  9  so that reference is made to the description in this respect. 
     The conveyor direction of the cross conveyance by the conveyor apparatus  15  can preferably be changed in the change-over apparatus  11  in the same manner as for the transfer apparatus  9 , the drive  15 B can therefore operate in different directions in order to be able to convey or change the lens carriers  5  alternately or if necessary from the second transport track T 2  to the third transport track T 3  or vice versa. 
     As already mentioned, a change-over apparatus  11  and a transfer apparatus  9  or their conveyor apparatus  15  for cross conveyance can also be combined with one another or can form a unit or can be located in an extension to one another. In this case a lifting table  15 C can be omitted. Furthermore, the transfer apparatus  9  can then allow a change over the second or middle transport track T 2  into the third transport track T 3  or can form a change-over apparatus. 
     In the illustrated example the distance of the first and second transport track T 1  and T 2  is preferably greater than the distance of the second and third transport track T 2  and T 3 . In this way the amount of space required by the processing apparatus  3  for accommodating and depositing lenses  2  on the respective conveyor apparatus  8  or a lens carrier  5  located thereon can be taken into account. In particular the processing apparatus  3  overlie or surround specifically the respectively assigned conveyor apparatus  8  at least in part, as is schematically indicated in the illustrated examples according to  FIG. 1  and  FIG. 5 . 
     Preferably under the transport tracks T or conveyor apparatus  10  and/or transfer apparatus  9  there can also be storage apparatus or tanks or the like for the processing apparatus  3 . 
     Further exemplary embodiments of the system  1  in accordance with the invention are explained below using the figures. In doing so important differences and new aspects are detailed so that statements and explanations so far apply especially accordingly or in a supplementary manner even if a repetition in this respect is omitted. 
       FIG. 5  shows in a schematic another exemplary embodiment of the system  1  in accordance with the invention.  FIG. 5  illustrates that the system  1  in accordance with the invention can be enlarged—therefore expanded very easily by integration or incorporation of further processing apparatus  3 . For example, further processing apparatus  3 , here for example, another processing apparatus  3 D for polishing and an additional processing apparatus  3 G for coating have been subsequently (in  FIG. 5  to the left thereof) incorporated here onto a processing or production line ending with the output [sic] station  6 . The transfer system  4  has been extended or supplemented accordingly. The delivery station  6  can also be modified if necessary and for example, can be located at the end, as is indicated using the broken line by position  6 ′. 
     The system  1  in accordance with the invention allows optimized processing and use of often different processing capacities of the different processing apparatus  3 . For example, lenses  2  or lens carriers  5  with lenses  2  can be conveyed alternately to the original processing apparatus  3 D on the right side or to the other processing apparatus  3 D on the left side, and conveyance via the third transport track T 2  and if necessary return especially via the third transport track T 3  can take place for example, for subsequent processing in the right-hand processing apparatus  3 F. 
     According to an especially preferred aspect of this invention, circulation or circular conveyance K of the lenses  2  or lens carriers  5  can take place via the second transport track T 2  in one direction and the third transport track T 3  in the opposite direction. In particular circulation or circular conveyance K of the lenses  2  or lens carriers  5  is enabled or formed by corresponding cross connections or cross conveyances between the two transport tracks T 2  and T 3 . This can enable in particular storage of lenses  2  or lens carriers  5  and/or can reduce or minimize the formation of unwanted congestion. In particular the lenses  2  and lens carriers  5  are extracted or conveyed as necessary and/or as available to desired processing apparatus  3 . This takes place especially by corresponding cross conveyance and/or changing to the first transport track T 1  or to one transfer apparatus  9  which is upstream of or assigned to the desired processing apparatus  3 . 
     Corresponding circulation or circular conveyance K of lenses  2  or lens carriers  5  is preferably likewise possible or provided in the system  1  in accordance with the invention according to the other exemplary embodiment shown in  FIG. 6  or according to the method in accordance with the invention. 
       FIG. 6  schematically shows that in the circulation or circular conveyance K several lens carriers  5  circulate or are conveyed in a circuit, for example, until the next or a desired processing apparatus  3  is ready to receive or deliver for suitable processing. 
     In the exemplary embodiment shown in  FIG. 6 , a system  1  originally built at least essentially in a straight line has been supplemented or expanded, the expansion section preferably running angled. The system  1  and the transport tracks T here therefore have especially an L-shape. As already mentioned, however also other especially polygonal arrangements or even an at least essentially solely straight-line arrangement or other arrangements are possible, in particular depending on structural circumstances. In the illustrated example the original system  1  with the original processing apparatus  3 A,  3 B,  3 C,  3 D,  3 F and  3 G (at the top in  FIG. 6 ) has been supplemented or expanded for example, by additional processing apparatus  3 C,  3 D and  3 E (on the left side in  FIG. 6 ). 
     The transfer system  4  is expanded in the illustrated example preferably via connecting apparatus  22 , especially corresponding extensions, turns, corner connectors and/or the like, especially preferably in order to connect further conveyor apparatus  10  and/or transfer apparatus  9  or the like and/or in order to extend the first, second and/or third transport track T or the like. Especially preferably the transport tracks T 2  and T 3  or the possible or preferred circular conveyance K are lengthened accordingly. In the illustrated example originally the circular conveyance K and transport tracks T ended in the region of the delivery station  6 . Only the expansion led to the L-shaped structure which is shown by way of example here. 
     The necessary additional transfer apparatus  9  or conveyor apparatus  10  and/or change-over apparatus  11  when the transfer system  4  is supplemented are connected preferably directly to the bus system  13 . Accordingly, the cost for the enlargement can be minimized, therefore an expansion can take place very easily. 
     As already mentioned, preferably independent control of the transfer system  4  on the one hand and of the conveyor apparatus  8  of the processing apparatus  3  on the other takes place. It is preferably provided that the transfer apparatus  9 , conveyor apparatus  10  and/or change-over apparatus  11  are controlled by the preferably central transfer control apparatus  12 , especially a memory-programmable control and/or via the bus system  13  and that the conveyor apparatus  8  of the processing apparatus  3  are controlled by the respective processing apparatus  3  or its machine control  20 . In particular, the transfer system  4  is controlled altogether by the control apparatus  12 . This allows an optimum sequence and/or very durable, less fault-susceptible control. Furthermore this facilitates an expansion of the system  1 . 
     In the illustrated example individual, several or all processing apparatus  3  or their machine controls  20  are connected preferably to the central system control  21 , for example, via a data network, a (further) bus system  25 , Ethernet cabling or the like. The system control  21  can be a server, a database system or the like. The system control  21  manages in particular the jobs to be handled by the system  1  or the lenses  2  to be processed/machined by the system  1  and the information necessary for the processing, for example, processing data, processing plans or processing sequences, processing statuses, scheduled or necessary processing steps, optical and/or geometric information or data of the lenses  2  and/or other information, for example, about tools which are to be used or which are available or the like. 
     Preferably the transfer control or control apparatus  12  on the one hand and the system control  21  on the other are coupled to one another for information or data exchange, as is schematically indicated in  FIG. 6 . 
     Preferably the system control  21  can control the transfer system  4  or the transfer apparatus  9 , conveyor apparatus  10  and/or change-over apparatus  11 , especially via the control apparatus  12  such that desired lenses  2  or lens carriers  5  are conveyed to the respective processing apparatus  3 , if necessary only on the corresponding request of the respective processing apparatus  3 . 
     In particular, different or all processing equipment  3  can individually request or retrieve work orders or lenses  2  to be processed/machined or lens carriers  5  with lenses  2  to be processed/machined automatically from the transfer system  4 , can carry out the necessary processing and again steer the lens  2  after processing back to the transfer system  4  or can transfer the lens to it. 
     The lenses  2  for processing/machining can be retrieved or requested by several or optionally all processing apparatus  3 , therefore preferably independently or automatically. In particular a processing apparatus  3  can ascertain automatically, especially with consideration of a processing plan and the processing status (these processing data or this information are interrogated or made available especially by the system control  21  or a database, a data storage or the like), whether a lens  2  (which is located especially in the vicinity or shortly upstream from the processing apparatus  3 ) is suitable for processing/machining in the respective processing apparatus  3  in order to have the lens or corresponding lens carrier  5  requested or delivered at a corresponding capacity of the processing apparatus  3 . 
     In particular, therefore, several processing apparatus  3  for the same processing/machining can choose and/or request a lens  2  for the next processing/machining operation independently of one another. In the illustrated example the request takes place by a processing apparatus  3  especially when it has been cleared. But if necessary the request can also take place beforehand to minimize waiting times. Then in the interim the next lens  2  to be processed/machined or the corresponding lens carrier  5  can already be enroute to the transfer apparatus  4  located upstream of the processing apparatus  3  or can be accepted by the transfer apparatus and can wait there until the processing apparatus  3  is ready to accommodate the next lens  2  or the next lens carrier  5 . 
     Preferably, the respective processing apparatus  3  outputs corresponding information or a corresponding signal to the control apparatus  12  when a lens  2  or a lens carrier  5  after processing/machining is to be or already has been delivered to the downstream transfer apparatus  9  or to the transfer system  4 . Depending on the capacity then the respective lens  2  or the respective lens carrier  5  is received by the transfer system  4  or the transfer apparatus  9  downstream of the respective processing apparatus  3 , for example, is injected again into the receiving area  19 , and/or continues to be conveyed, for example, to a downstream processing apparatus  3  and/or into the second transport track T 2  or the circular conveyance K. This can take place alternately by the transfer system  4  or its control apparatus  12  automatically and/or in coordination and/or depending on the system control  21 . 
     Furthermore, a lens  2  or lens carrier  5  is again delivered to the processing apparatus  3  which is ready to accommodate a lens  2  or lens carrier  5 , the choice, as already mentioned, taking place especially preferably by the respective processing apparatus  3  or its machine control  20  and/or by the system control  21 , especially preferably with consideration of data relevant to the processing, such as the processing plan and processing state, especially from the system control  21 . Delivery is then controlled preferably via the control apparatus  12 , but if necessary can also be controlled by the respective processing apparatus  3  or its machine control  20 , as detailed below using another exemplary embodiment according to  FIG. 7 . 
     Alternatively, or in addition the respective processing apparatus  3  has priority for example, over a downstream or upstream processing apparatus  3  and/or over the transfer control or control apparatus  12  in the delivery and removal of lenses  2  or lens carriers  5  or in the triggering of the upstream and/or downstream transfer apparatus  9  or conveyor apparatus  14 . 
     Especially preferably a processing apparatus  3  or its conveyor apparatus  8  after processing transfers a lens  2  or lens carrier  5  to the transfer system  4  or to a transfer apparatus  9  which is preferably downstream in the conveyor direction F 1 , if or as soon as there is room there for acceptance, especially when the respective or assigned receiving area  19  is free. To do this the processing apparatus  3  or its machine control  20  communicates preferably via the system control  21  or directly with the transfer control or control apparatus  12  or the transfer system  4  or the respective transfer apparatus  9 . 
     After the processing apparatus  3  or its conveyor apparatus  8  clears, it can again accept the next lens  2  or the next lens carrier  5 . Delivery takes place especially via the transfer system  4  or the upstream transfer apparatus  9 . Delivery is triggered preferably by a request of the respective processing apparatus  3  or by the system control  21  when it recognizes or has been notified that the processing apparatus  3  or its conveyor apparatus  8  has cleared. 
     It should be noted that the conveyor apparatus  8  of the processing apparatus  3  can also accept in particular several lenses  2  or lens carriers  5  with lenses  2  if necessary (at the same time). The term “clearing” should then be accordingly understood as the respective processing apparatus  3  or its conveyor apparatus  8  being ready to accept a lens  2  or lens carrier  5 , even if one or more lenses  2  or lens carriers  5  are still in the processing apparatus  3  or its conveyor apparatus  8 . 
     As already mentioned, in the illustrated example delivery can take place especially alternately from the receiving area  19  of an upstream transfer apparatus  9  or by cross conveyance via the transfer apparatus  15  and subsequent longitudinal conveyance via the conveyor apparatus  14  of the upstream transfer apparatus  9 , therefore by delivery from the second transport track T 2 . Preferably the control apparatus  12  and/or the request of the respective processing apparatus  3  and/or a prioritization of processing operations or lenses  2  by the system control  21  controls the sequence. 
     The lens  2  which is already being processed/machined beforehand by the processing apparatus  3  or the lens carrier  5  which bears it can be accommodated by the downstream transfer apparatus  9  and if necessary can be stored on an interim basis in the receiving area  19 . But continued conveyance without stopping can also optionally take place directly if necessary. 
     The continued conveyance can consist in that the lens  2  or lens carrier  5  continues to be conveyed to the next processing apparatus  3 , therefore in the conveyor direction F 1  onward along the first transport track T 1 , therefore it is delivered to the next processing apparatus  3  or its transfer apparatus  8 . Alternatively, cross conveyance can also take place by means of the conveyor apparatus  15  and change-over to the second transport track T 2  and optionally further to the third transport track T 3  can take place. Thus continued conveyance to another processing apparatus  3  or optionally to the delivery station  6  can then take place. 
     Preferably continued conveyance takes place via the second and/or third transport track T 2 , T 3  when delivery to another processing apparatus  3  is desired or necessary, for example, due to the failure of a processing apparatus  3  or different equipment or different tools of the processing apparatus  3 , or for example, due to a desired or necessary processing sequence or a desired or necessary processing progression. 
       FIG. 7  shows in a schematic another exemplary embodiment of the system  1  in accordance with the invention. Preferably individual, several or all transfer apparatus  9  have in addition a conveyor apparatus  15 ′ for cross conveyance in addition to the respective conveyor apparatus  15  for cross conveyance. Both conveyor apparatus  15  and  15 ′ of a transfer apparatus  9  can preferably be operated independently of one another. This makes it possible for the respective processing apparatus  3  to control the upstream cross conveyance via the upstream conveyor apparatus  15  and the downstream conveyance via the downstream conveyor apparatus  15 ′ directly or automatically, especially independently of the transfer control or control apparatus  12  which is not shown in  FIG. 7 . Thus the automatic extraction of lenses  2  or lens carriers  5  from circulation or circular conveyance K and/or automatic return or re-injection of lenses  2  or lens carriers  5  into circulation or circular conveyance K by the respective processing apparatus  3  or its machine control  20  is enabled. For the processing apparatus  3 C and  3 D it is indicated therefore for example, in  FIG. 7  that the respective machine control  20  is connected to the assigned conveyor apparatus  15  and  15 ′. 
     The assigned or in-between conveyor apparatus  14  is optionally provided, can therefore also be omitted, and is preferably controlled by the upstream or downstream processing apparatus  3  or its machine control  20 . 
     Alternatively, or in addition, especially preferably detection of lenses  2  or lens carriers  5  is enabled via especially sensors  16  likewise connected to the machine control  20 . It is possible for example, by means of the sensors  16  to identify lenses  2  or lens carriers  5  which are in the transport track T 2  or circulation or circular conveyance K and to extract lenses  2  or lens carriers  5  which are suitable for processing in the respective processing apparatus  3  or have them changed over to the first transport track T 2 , especially independently of other processing apparatus  3  or their machine control  20  and/or independently of the transfer control or control apparatus  12  and/or independently of the system control  21 . 
     The machine control  20  is assigned preferably to the respective processing apparatus  3  or are arranged in it, but can also be located separately from it or centrally. 
       FIG. 8  schematically shows another exemplary embodiment of the system  1  in accordance with the invention. In this exemplary embodiment, preferably an at least essentially U-shaped arrangement, especially of the first or second transport track T 1  or T 2 , is formed. 
     Preferably, two groups or rows of processing apparatus  3 , here, for example, a first group of processing apparatus  3 A,  3 B and  3 C and a second group of processing apparatus  3 D,  3 E, and  3 F are formed or arranged opposite one another and/or with conveyor apparatus  8  which are arranged on facing sides and/or are arranged such that the assigned transport tracks T 1  and/or T 2  of the two groups run preferably parallel to one another. 
     Preferably, the system  1  or the transfer system  4  has a cross connection of the two groups of processing apparatus  3  via a conveyor apparatus  10 ′ and/or  10 ″ connected transversely or to one another. 
     Preferably, the conveyor apparatus  10 ′ forms one leg or section of the preferably at least essentially U-shaped arrangement or one part of the preferably essentially U-shaped path of the first or second transport track T 1  or T 2 , here of the second transport track T 2 . If necessary there can also be one or more processing apparatus  3  on this section. 
     Preferably, the system  1  or the transfer system  4  has a return conveyor connection R. 
     Preferably, the return conveyor connection R has the (second) conveyor apparatus  10 ″ or is formed by it. 
     Preferably, in the illustrated exemplary embodiment, circular conveyance or circulation is possible, especially preferably, via the first or second transport track T 1  or T 2 . In the exemplary embodiment, for this purpose, there is the return conveyor connection R for the first or second transport track T 1  or T 2  (in the illustrated example only for the second transport track T 2 ). Here, the return conveyor connection R enables return in the return conveyor direction FR so that circular conveyance or circulation of the lenses  2  or lens carriers  5  via the second transport track T 2  is enabled without reversing the conveyor direction F 2  and without changing to the opposite conveyor direction F 3 . 
     In the illustrated exemplary embodiment, the system  1  or the transfer system  4  preferably has a receiving station  7  and/or delivery station  6  or corresponding conveyor apparatus  10  (indicated in  FIG. 8  by the broken line on the left side) as an inlet and/or outlet distance for lenses  2  or lens carriers  5 . 
     The return conveyor connection R or conveyor apparatus  10 ″ is especially preferably located in the region of the start and/or end of the transport track T 1  or T 2  and/or of the conventional processing and/or in the region of the receiving station  7  or delivery station  6 . Especially preferably the return conveyor connection R or conveyor apparatus  10 ″ is connected via corresponding shunts. But other designs and/or arrangements are also possible, especially depending on the location and execution or arrangement of the receiving station  7  and/or delivery station  6 . 
     In the exemplary embodiment according to  FIG. 8 , the return conveyor connection R allows circular conveyance or circulation of the lenses  2  or lens carriers  5 . Accordingly, a third transport track T 3  for return or circulation is not necessary, but the return conveyor connection R and the third transport track T 3  can, if necessary, also be combined or used in a supplementary manner, especially depending on structural circumstances and/or existing processing apparatus  3 . 
     The return conveyor connection R can, if necessary, also be located elsewhere or can form only one circuit for some of the processing apparatus  3 , for example, can be connected, on the one hand, between the processing apparatus  3 B,  3 C, and on the other hand, between the processing apparatus  3 D,  3 E, as necessary can therefore also enable a shorter or smaller circuit. 
     If necessary, there can also be several such cross connections or return conveyor connections R. In this way, if necessary, additional storage lengths can also be formed. 
     Preferably, the system  1  or the transfer system  4  has conveyor apparatus  23  for curved conveyance, especially to connect straight sections of the respective transport track, here, T 2 , and/or different conveyor apparatus  10 ,  10 ′ and/or  10 ″ and/or the return conveyor connection R to the transport track T 2 . The curved conveyance can result in that the alignment of the lenses  2  or lens carriers  5  with regard to the respective conveyor direction F remains the same, therefore, for example, in a lens carrier  5  with two lenses  2  the same lens  2  is always forward. 
     The two groups of processing apparatus  3  or the two legs of the especially preferably U-shaped arrangement in the illustrated example are preferably relatively close together and/or are spaced such that the intermediate space forms an access possibility for an operator who is not shown. In particular, to do this, the cross connections or conveyor apparatus  10 ′ and/or  10 ″ are made such that they can if necessary be detached or opened or folded away. Alternatively, or in addition, they can also be placed higher or lower, and for example, can be connected via corresponding vertical conveyors or gradient distances so that preferably free access to the intermediate space is enabled. 
     Alternatively, or in addition, the intermediate space can also be used for consumable tanks for processing apparatus  3 , for example, for a coolant tank, a tank for shavings, a tank for cooling liquid or the like. The tanks can especially be located in the intermediate space and/or underneath the transfer system, especially preferably underneath the second transport track T 2 . 
       FIG. 9  schematically shows a block diagram of a preferred control structure of a system  1  in accordance with the invention. 
     As already mentioned, the system  1  or the transfer system  4  preferably has an especially central transfer or control apparatus  12 . It is especially a so-called belt supervisory computer. If necessary it can also be a program and/or several networked computers, data processing systems, controls or the like. 
     The transfer or control apparatus  12  is used especially to control the production flows or conveyance of the lenses  2  or lens carriers  5 , such as the circulation or circular conveyance and/or conveyance of lenses  2  or lens carriers  5  to the processing apparatus  3  and away from them. 
     Especially preferably, the control apparatus  12  controls the transfer apparatus  9 , conveyor apparatus  10  and/or change-over apparatus  11 , conveyor apparatus  14  for longitudinal conveyance, conveyor apparatus  15  for cross conveyance and/or stopping apparatus  18 , and the transfer apparatus  9  preferably can also be (directly) controlled in addition or alternatively by the processing apparatus  3  or their machine control  20  especially when connected to the bus system  13 . 
     The system control  21  is preferably coupled or connected to the processing apparatus  3  or their machine controls  20  via a (further) bus system  25 . But, other types of connection are also possible. 
     The control apparatus  12  can be connected to the system control  21  likewise via the bus system  25  or a separate connection for data exchange. 
     The system control  21  preferably forms a lens management system. 
     The system control  21  is used especially to accept or acquire jobs O and/or for management of jobs, production data and/or lens blanks and/or to make available interfaces to other system, for example, to systems or modules for lens design which in particular depending on desired optical properties determine the desired geometrical configuration of lenses  2  and/or the necessary processing or processing steps. 
     In particular, production data P which contain especially processing plans (processing steps and/or sequences or orders) and processing statuses (processing states or information on processing to be performed next) are managed and/or generated in the system control  21  (or some other server or data storage). 
     The production data P are made available especially by the system control  21  to the processing apparatus  3  or their machine controls  20  and/or can be interrogated by them, as schematically indicated by a corresponding arrow in  FIG. 9 . 
     The status of the processing apparatus  3 , especially the processing status or production status, the availability of the respective processing apparatus  3 , the tool equipment, the possible processing operations and/or other similar information are transferred as status information S from the processing apparatus  3  or their machine control  20  especially to the system control  21 , as indicated by a corresponding arrow in  FIG. 9 , and/or to a system  26  for display and/or management. 
     The system  26  is used especially for visualization and/or management of machine states, therefore states of the processing apparatus  3 , production data, process data and/or other information. 
     Furthermore, the system  26  is used preferably to manage macros and/or reporting. 
     The system  26  can comprise corresponding programs, applications or the like and/or one or more computers, such as a server or the like. The corresponding also applies to the system control  21  and/or control apparatus  12 . 
     The processing apparatus  3  or their machine controls  20  can preferably furthermore communicate information I such as process data and the like, to the system  26 , as indicated by a corresponding arrow in  FIG. 9 . 
     For information or data exchange the system  26  can also be connected to the bus system  25 . Alternatively or in addition the data exchange can also take place via the system control  21 . 
     Preferably, the system control  21  and the system  26  can exchange production data P and/or data, status information S, for example, on the job status, as indicated by the arrow P/S in  FIG. 9 . 
     Preferably, the system control  21  and the control apparatus  12  can exchange and/or balance production data P, as indicated by a corresponding arrow in  FIG. 9 , and/or status information S, especially data on the job status, as indicated by a corresponding arrow A in  FIG. 9 . 
     For data exchange, the control apparatus  12  is preferably also connected to the further bus system  25  and/or in some other way or is connected or can be connected for data exchange. 
     Preferably, the processing apparatus  3  or their machine controls  20  can exchange job information A, such as information on the status, especially job status, inquiries and/or requests, as indicated by a corresponding arrow in  FIG. 9 . Especially preferably, inquiries and job information A can be transferred to the control apparatus  12  or communicated to it and/or a request for a lens  2  or a lens carrier  5  can be transferred to the control apparatus  12 . Alternatively or in addition, information about lenses  2  or lens carriers  5  which have been identified or detected preferably by the sensors  16  can be transferred directly or via control apparatus  12  to one, several or all processing apparatus  3  or their machine control  20  or can be made available to them. This information is exchanged especially within the framework of the request for new lenses  2  or lens carriers  5  by the processing apparatus  3 , as is indicated by the double arrow A in  FIG. 9 . This information exchange can also take place with consideration of other data or information, especially process data, especially preferably processing plans and processing statuses which are made available preferably by the system control  21 . 
     In particular, the processing apparatus  3  can preferably independently select and/or request new jobs or lenses  2  for processing. According to one especially preferred aspect, this enables more or less optional or independent incorporation of processing apparatus  3  into the system  1 . 
     The system  1  in accordance with the invention and the method in accordance with the invention for processing of optical lenses  2  is very flexible. In particular, improved or optimized use of processing/machining capacities can be achieved. Furthermore very flexible processing and adaptation to different circumstances are enabled. For example, downtimes or failures of individual processing apparatus  3  can be very easily and/or optimally compensated, in particular if other or alternative processing apparatus  3  are available. Alternatively or in addition, intelligent focal control can take place, for example, such that a processing apparatus  3  which is especially suitable for certain processing is being used primarily for this processing, therefore, for example, a lathe with an especially large chip space for processing of lenses  2  which produce especially long and bulky shavings during processing. 
     The system  1  in accordance with the invention and the method in accordance with the invention allow, in particular, very high flexibility even in the processing of lenses  2  with different shapes and/or of different materials. In particular the previously conventional processing lines or production lines which are designed primarily for processing of lenses  2  from a certain material or of lenses  2  of a certain shape can be avoided. 
     Furthermore, the system  1  in accordance with the invention and the method in accordance with the invention enable especially good use of available tools or other consumables. 
     Individual aspects and features of the system  1  in accordance with the invention and the described sequences and different exemplary embodiments can also be implemented independently of one another, but also in any combination. 
     Further aspects of the invention are: 
     1. A system ( 1 ) for machining of optical lenses ( 2 ), 
     with several separate machining apparatus ( 3 ) for independent machining of the lenses ( 2 ) and with a transfer system ( 4 ) for conveyance of the lenses ( 2 ), especially of lens holding-fixtures ( 5 ) with the lenses ( 2 ) to and from the machining apparatus ( 3 ), 
     each machining apparatus ( 3 ) being assigned its own conveyor apparatus ( 8 ) for especially linear conveyance of the lenses ( 2 ) or lens holding-fixtures ( 5 ), 
     the system ( 1 ) or the transfer system ( 4 ) having a first transport track (T 1 ) for conveyance of lenses ( 2 ) or lens holding-fixtures ( 5 ) from one machining apparatus ( 3 ) to the next and a second parallel transport track (T 2 ) for parallel conveyance of lenses ( 2 ) and lens holding-fixtures ( 5 ),
 
characterized in that the transfer system ( 4 ) has transfer apparatus ( 9 ) located between the machining apparatus ( 3 ) for accommodation and temporary intermediate storage in a receiving area ( 19 ) and for continued conveyance of at least one lens ( 2 ) or one lens holding-fixture ( 5 ) if necessary alternately to the conveyor apparatus ( 8 ) of a following machining apparatus ( 3 ) or to the second transport track (T 2 ), the transfer apparatus ( 9 ) and the conveyor apparatus ( 8 ) forming the first transport track (T 1 ) and being independently drivable or controllable for independent conveyance.
 
2. The system as described in aspect 1, characterized in that the transfer apparatus ( 9 ) each have one conveyor apparatus ( 14 ) for longitudinal conveyance of at least one lens ( 2 ) or one lens holding-fixture ( 5 ) parallel to one of the transport tracks (T) and a conveyor apparatus ( 15 ) for cross conveyance of at least one lens ( 2 ) or one lens holding-fixture ( 5 ).
 
3. The system as described in aspect 2, characterized in that the conveyor apparatus ( 14 ,  15 ) or the longitudinal conveyance and cross conveyance of one or each transfer apparatus ( 9 ) can be controlled independently of one another.
 
4. The system as described in aspects 2 or 3, characterized in that the conveyor apparatus ( 14 ) for longitudinal conveyance forms or has the receiving area ( 19 ) for at least one lens ( 2 ) or at least one lens holding-fixture ( 5 ) of the respective transfer apparatus ( 9 ).
 
5. The system as described in one of aspects 2 to 4, characterized in that receiving area ( 19 ) is located upstream of the conveyor apparatus ( 15 ) for cross conveyance to the respective transfer apparatus ( 9 ).
 
6. The system as described in one of aspects 2 to 6, characterized in that the conveyor apparatus ( 14 ) for longitudinal conveyance is integrated into the first transport track (T 1 ) and that the conveyor apparatus ( 15 ) is used or made for changing between the first and second transport track (T 1 , T 2 ) and vice versa.
 
7. The system as described in one of aspects 2 to 5, characterized in that the conveyor direction of the conveyor apparatus ( 15 ) can be reversed for cross conveyance.
 
8. The system as described in one of the preceding aspects, characterized in that when a lens ( 2 ) or lens holding-fixture ( 5 ) is accommodated or stored on an interim basis in the receiving area ( 19 ) of a transfer apparatus ( 9 ) another lens ( 2 ) or another lens holding-fixture ( 5 ) can be conveyed by means of the transfer apparatus ( 9 ) from the second transport track (T 2 ) to the conveyor apparatus ( 8 ) or machining apparatus ( 3 ) downstream of the transfer apparatus ( 9 ).
 
9. The system as described in one of the preceding aspects, characterized in that the transfer apparatus ( 9 ) each form a shunt.
 
10. The system as described in one of the preceding aspects, characterized in that a sensor ( 16 ) for detection or identification of lenses ( 2 ) or lens holding-fixtures ( 5 ) is assigned to the receiving area ( 19 ).
 
11. The system as described in one of the preceding aspects, characterized in that transfer apparatus ( 9 ) each have one stopping apparatus ( 18 ) for stopping at least one lens ( 2 ) or at least one lens holding-fixture ( 5 ) in the receiving area ( 19 ).
 
12. The system as described in one of the preceding aspects, characterized in that one stopping apparatus ( 18 ) at a time for stopping one lens ( 2 ) or one lens holding-fixture ( 5 ) in the second transport track (T 2 ) and/or one sensor ( 16 ) at a time for detection or identification of one lens ( 2 ) or one lens holding-fixture ( 5 ) in the second transport track (T 2 ) is assigned to the transfer apparatus ( 9 )
 
13. The system as described in one of the preceding aspects, characterized in that the system ( 1 ) or the transfer system ( 4 ) has a control apparatus ( 12 ) for controlling the transfer apparatus ( 9 ), the conveyor apparatus ( 8 ) of the machining apparatus ( 3 ) being controllable by the respective machining apparatus ( 3 ) independently of one another and independently of the transfer apparatus ( 9 ).
 
14. The system as described in one of the preceding aspects, characterized in that the transfer apparatus ( 9 ) can be controlled by the machining apparatus ( 3 ) which is the next one at the time or its machine control ( 20 ), especially depending on detected lenses ( 2 ) or lens holding-fixtures ( 5 ) in order to convey lenses ( 2 ) or lens holding-fixtures ( 5 ) alternately from the previous machining apparatus ( 3 ) or the receiving area ( 19 ) on the one hand and the second transport track (T 2 ) on the other hand by means of the transfer apparatus ( 9 ) to the next machining apparatus ( 3 ).
 
15. The system ( 1 ) for machining of optical lenses ( 2 ), especially as claimed in one of the preceding claims,
 
with several separate machining apparatus ( 3 ) for independent machining of the lenses ( 2 ) and with a transfer system ( 4 ) for conveyance of the lenses ( 2 ), especially of lens holding-fixtures ( 5 ) with the lenses ( 2 ) to and from the machining apparatus ( 3 ),
 
each machining apparatus ( 3 ) being assigned its own conveyor apparatus ( 8 ) for especially linear conveyance of the lenses ( 2 ) or lens holding-fixtures ( 5 ),
 
the system ( 1 ) or the transfer system ( 4 ) having a first transport track (T 1 ) for conveyance of lenses ( 2 ) or lens holding-fixtures ( 5 ) from one machining apparatus ( 3 ) to the next and a second parallel transport track (T 2 ) for parallel conveyance of lenses ( 2 ) and lens holding-fixtures ( 5 ), characterized in that
 
the system ( 1 ) or the transfer system ( 4 ) has a third parallel transport track (T 3 ) for parallel conveyance or return and/or for circulation of lenses ( 2 ) or lens holding-fixtures ( 5 ) so that the lenses ( 2 ) or lens holding-fixtures ( 5 ) can be conveyed to some or all machining apparatus ( 3 ) in any sequence and/or repeatedly.
 
16. The system as described in aspect 15, characterized in that the conveyor direction (F 3 ) of the second and/or third transport track (T 2 , T 3 ) can be reversed.
 
17. The system as described in aspects 15 or 16, characterized in that the second and third transport track (T 2 , T 3 ) have conveyor directions (F 2 , F 3 ) which are opposite one another.
 
18. The system ( 1 ) for machining of optical lenses ( 2 ), especially as claimed in one of the preceding claims,
 
with several separate machining apparatus ( 3 ) for independent machining of the lenses ( 2 ) and with a transfer system ( 4 ) for conveyance of the lenses ( 2 ), especially of lens holding-fixtures ( 5 ) with the lenses ( 2 ) to and from the machining apparatus ( 3 ),
 
each machining apparatus ( 3 ) being assigned its own conveyor apparatus ( 8 ) for especially linear conveyance of the lenses ( 2 ) or lens holding-fixtures ( 5 ),
 
the system ( 1 ) or the transfer system ( 4 ) having a first transport track (T 1 ) for conveyance of lenses ( 2 ) or lens holding-fixtures ( 5 ) from one machining apparatus ( 3 ) to the next and a second parallel transport track (T 2 ) for parallel conveyance of lenses ( 2 ) and lens holding-fixtures ( 5 ), characterized in that
 
the system ( 1 ) or the transfer system ( 4 ) has a return connection (R) for return or circulation of lenses ( 2 ) or lens holding-fixtures ( 5 ) so that the lenses ( 2 ) or lens holding-fixtures ( 5 ) can be conveyed to some or all machining apparatus ( 3 ) in any sequence and/or repeatedly.
 
19. The system as described in aspect 18, characterized in that the return connection (R) connects the first or second transport track (T 1 , T 2 ), especially in the region of the start and/or end of the first or second transport track (T 1 , T 2 ) and/or in the region of a receiving station ( 7 ) and/or a delivery station ( 6 ) so that circulation or circular conveyance of lenses ( 2 ) or lens holding-fixture ( 5 ) is enabled.
 
20. The system ( 1 ) for machining of optical lenses ( 2 ), especially as claimed in one of the preceding claims,
 
with several separate machining apparatus ( 3 ) for independent machining of the lenses ( 2 ) and with a transfer system ( 4 ) for conveyance of the lenses ( 2 ), to and from the machining apparatus ( 3 ),
 
characterized in that
 
the system ( 1 ) has a system control ( 21 ) which keeps the machining plans and machining statuses for the lenses ( 2 ) ready and,
 
that the transfer system ( 4 ) has several transfer apparatus ( 9 ) and sensors ( 16 ), a machining apparatus ( 3 ) is made for requesting a lens ( 2 ) detected by means of a sensor ( 16 ) via the control apparatus ( 12 ) if this lens ( 2 ) can be machined by the machining apparatus ( 3 ) according to the machining plan and machining status, and
 
after completed machining in the machining apparatus ( 3 ) the new machining status is communicated to the system control ( 21 ) and the machining apparatus ( 3 ) transfers the machined lens ( 2 ) again to the transfer system ( 4 ) for clearing the machining apparatus ( 3 ).
 
21. The system as described in aspect 20, characterized in that the machining apparatus ( 3 ) is assigned its own conveyor apparatus ( 8 ) for especially linear conveyance of the lenses ( 2 ) or lens holding-fixtures ( 5 ), the conveyor apparatus ( 8 ) forming a first transport track (T 1 ).
 
22. The system as described in one of the preceding aspects, characterized in that the first transport track (T 1 ) runs in a straight line through the machining apparatus ( 3 ).
 
23. The system as described in one of the preceding aspects, characterized in that the transfer system ( 4 ) has several change-over apparatus ( 11 ) with conveyor apparatus ( 15 ) for cross conveyance of at least one lens ( 2 ) or one lens holding-fixture ( 5 ) for changing between transport tracks (T).
 
24. The system as described in aspects 2 or 23, characterized in that the conveyor apparatus ( 15 ) can be alternately raised or lowered for cross conveyance.
 
25. The system as described in one of the preceding aspects, characterized in that the transport tracks (T) are each built up out of several conveyor apparatus ( 10 ) for linear conveyance of lenses ( 2 ) or lens holding-fixtures ( 5 ).
 
26. The system as described in one of the preceding aspects, characterized in that the transport tracks (T) and/or the conveyor apparatus ( 10 ) of one transport track (T) for independent conveyance of several lenses ( 2 ) or lens holding-fixtures ( 5 ) can be controlled independently of one another.
 
27. The system as described in one of the preceding aspects, characterized in that the conveyor apparatus ( 8 ,  10 ,  14 ,  15 ) are made as belt conveyors.
 
28. The system as described in one of the preceding aspects, characterized in that the first and/or second transport track (T 1 , T 2 ) runs at least essentially in a U-shape.
 
29. The system as described in one of the preceding aspects, characterized in that two groups of machining apparatus ( 3 ) are formed or arranged parallel to one another and/or opposite one another and/or with conveyor apparatus ( 8 ) which are arranged on facing sides.
 
30. The system as described in one of the preceding aspects, characterized in that the transport tracks (T) run parallel.
 
31. The system as described in one of the preceding aspects, characterized in that the system ( 1 ) has several machining apparatus ( 3 C,  3 D) for forming, especially cutting and/or polishing.
 
32. A method for machining of optical lenses ( 2 ),
 
the lenses ( 2 ) or lens holding-fixtures ( 5 ) with the lenses ( 2 ) being alternately delivered to different machining apparatus ( 3 ) for independent machining of the lenses ( 2 ),
 
the lenses ( 2 ) or lens holding-fixtures ( 5 ) are conveyed independently by conveyor apparatus ( 8 ) in the machining apparatus ( 3 ),
 
characterized in that
 
the lenses ( 2 ) or lens holding-fixtures ( 5 ) are accommodated temporarily by transfer apparatus ( 9 ) between the machining apparatus ( 3 ) in a receiving area ( 19 ) and continue to be conveyed alternately to the next machining apparatus ( 3 ) or to a parallel transport track (T 2 , T 3 ),
 
the machining apparatus ( 3 ) or their conveyor apparatus ( 8 ) after machining of lenses ( 2 ) being cleared by the latter being received by downstream transfer apparatus ( 9 ) in the receiving areas ( 19 ) and being stored there on an interim basis in order to be able to convey other lenses ( 2 ) or lens holding-fixtures ( 5 ) to the machining apparatus ( 3 ) downstream of the respective transfer apparatus ( 9 ), and/or
 
the transfer apparatus ( 9 ) with the machining apparatus ( 3 ) forming a first transport track (T 1 ) and the lenses ( 2 ) or lens holding-fixtures ( 5 ) being conveyed in a second transport track (T 2 ), parallel to the first transport track (T 1 ) and changing over by means of the transfer apparatus ( 9 ) between the first and second transport track (T 1 , T 2 ).
 
33. The method as described in aspect 32, characterized in that the lenses ( 2 ) or lens holding-fixtures ( 5 ) in the parallel transport track (T 2 ) are conveyed and/or circulated in a first direction (F 2 ) and in another parallel transport track (T 3 ) in the opposite direction until extraction or cross conveyance to the transport track (T 1 ) which contains the machining apparatus ( 3 ) or to a desired machining apparatus ( 3 ) takes place.
 
34. The method as described in aspects 32 or 33, characterized in that the transfer apparatus ( 9 ) are controlled by a control apparatus ( 12 ) and the conveyor apparatus ( 8 ) of the machining apparatus ( 3 ) are controlled by the respective machining apparatus ( 3 ) or its machine control ( 20 ).
 
35. The method as described in one of aspects 32 to 34, characterized in that each machining apparatus ( 3 ) controls its assigned conveyor apparatus ( 8 ) independently of the transfer apparatus ( 9 ) and/or independently of a transfer system ( 4 ) for conveyance of lenses ( 2 ) or lens holding-fixtures ( 5 ) for machining.
 
36. The method as described in one of aspects 32 to 35, characterized in that one transfer apparatus ( 9 ) at a time accepts one machined lens ( 2 ) or one lens holding-fixture ( 5 ) of at least one machined lens ( 2 ) from an upstream or assigned machining apparatus ( 3 ) after completed machining and temporarily stores it on an interim basis until a downstream machining apparatus ( 3 ) has been cleared or until injection into a parallel transport track (T 2 , T 3 ) is possible.
 
37. The method as described in one of aspects 32 to 36, characterized in that the transfer apparatus ( 9 ) alternately convey the lenses ( 2 ) or lens holding-fixtures ( 5 ) lengthwise or crosswise.
 
38. The method for machining of optical lenses ( 2 ), especially as claimed in one of claims  32  to  37 ,
 
the lenses ( 2 ) being alternately supplied by means of a transfer system ( 4 ) to separate machining apparatus ( 3 ) for independent machining of the lenses ( 2 ),
 
especially the lenses ( 2 ) being conveyed on or in lens holding-fixtures ( 5 ),
 
characterized in that
 
the system control ( 21 ) manages machining statuses for the lenses ( 2 ) to be machined,
 
that the machining apparatus ( 3 ) after completed machining communicates the new machining state of the machined lens(es) ( 2 ) to the system control ( 21 ), and
 
that one or each machining apparatus ( 3 ) after completed machining delivers the lens ( 2 ) or the corresponding lens holding-fixture ( 5 ) again to the transfer system ( 4 ) and automatically requests a new lens ( 2 ) or a new lens holding-fixture ( 5 ).
 
39. The method as described in aspect 38, characterized in that the respective machining apparatus ( 3 ) detects and requests a lens ( 2 ) which is suitable for machining in the respective machining apparatus ( 3 ) or a lens holding-fixture ( 5 ) with such a lens ( 2 ) via at least one assigned sensor ( 16 ).
 
40. The method as described in aspects 38 or 39, characterized in that the lenses ( 2 ) are conveyed independently by conveyor apparatus ( 8 ) into the machining apparatus ( 3 ) and that the machining apparatus ( 3 ) control their assigned conveyor apparatus ( 8 ) each independently of the transfer system ( 4 ).
 
41. The method as described in one of aspects 32 to 40, characterized in that the respective machining apparatus ( 3 ) detects coding ( 5 A) of the lenses ( 2 ) or lens holding-fixtures ( 5 ) for determining machining plans and the machining takes place in the machining apparatus ( 3 ) depending on the machining plans.
 
42. The method as described in one of aspects 32 to 41, characterized in that the lenses ( 2 ) or lens holding-fixtures ( 5 ) can be selectively delivered to each desired choice of the machining apparatus ( 3 ).
 
43. The method as described in one of aspects 32 to 42, characterized in that the lenses ( 2 ) or lens holding-fixtures ( 5 ) if necessary can be conveyed past any machining apparatus ( 3 ) via a parallel transport track (T 2 , T 3 ).
 
44. The method as described in one of aspects 32 to 43, characterized in that the lenses ( 2 ) or lens holding-fixtures ( 5 ) can be conveyed backwards especially by means of a third transport track ( 3 ).
 
45. The method as described in one of aspects 32 to 44, characterized in that several lens holding-fixtures ( 5 ) can be accommodated by one machining apparatus ( 3 ).