19  EP 3 800 007 A1 20  in the lens processing device 1C will be referred to as a third installation position 10C. [0056] In the present embodiment, the eyeglass lens is installed at a predetermined standby position 8 before the plurality of steps are performed by the plurality of eyeglass manufacturing devices 1.Specifically,a worker installs a tray (not illustrated) at the standby position 8 in a state where the eyeglass lens to be processed by the eyeglass lens peripheral edge processing system 100 is placed on the tray. In addition, the eyeglass lens after the plurality of steps are completed by the plurality of eyeglass manufacturing devices 1 is moved to a prede- termined completion position 9 (in the present embodi- ment,thetrayinstalled atthe completionposition 9).The standby position 8 and the completion position 9 are sep- arated from positions where the plurality of eyegl manufacturing devices 1 are installed. The standby po- sition 8 and the completion position 9 may be the same position. 5 10 15 in the eyeglass lens peripheral edge processing system 100 according to the present embodiment will be scribed. In the present embodiment, the plurality of eye- glass manufacturing devices 1 are disposed to surround the robot arm 3 along the circumferential direction round on the pivot axis X1 (refer to FIG. 2) around which the robot arm 3 installed on the installation surface (specifi- cally, the robot arm 3A disposed at the second work po- sition P2 and the robotarm 3B disposed atthe third work position P3) pivots the holding unit 37. Therefore, com- pared toa case where the pluralityofeyeglass manufac- turing devices 1 are disposed on a straightline along the conveyor,a space forinstalling the eyeglasslensperiph- eraledge processingsystem100can beeasily reduced. In addition, as described above, the robot arm 3 pivots the holding unit 37. In this manner, the robot arm 3 can easily move the eyeglass lens between the plurality of eyeglass manufacturing devices 1 disposed to surround the robot arm 3. [0057] In a case where the eyeglass lens peripheral edge processing system 100 according to the present embodimentprocesses the peripheraledge theeyeglass lens, the robot arm 3A first holds the eyeglass lens in- stalled on the tray at the standby position 8 in a state where the arm unit 30 itself is moved to a first work po- sition P1 in the vicinity of the standby position 8. Next, the robotarm3A moves the armunit30 itselfto a second work position P2 in the vicinityoftheplurality ofeyeglass manufacturing devices 1, and installs the eyeglass lens at the first installation position 10A of the lens meter 1A. 20 25 [0060] Specifically, in the present embodiment, in a case where the plurality of eyeglass manufacturing de- vices 1 are viewed in a direction of the pivot axis X1 of the robot arm 3 (that is,in the presentembodiment, from above), the plurality of eyeglass manufacturing devices 1are disposedclockwise orcounterclockwise (clockwise in the present embodiment) in the order of performing the steps on the eyeglass lens. That is, in the present embodiment, the lens meter 1A that first performs the lens measurement step, the cup attachment device 1B that secondly performs the processing preparation step, and the lens processing device 1C that lastly performs the processingstep are disposedclockwiseinthisorder. Therefore, the robot arm 3 can smoothly move the eye- glass lenswithrespectto each ofthe plurality ofeyeglass manufacturing devices 1 in the order of performing the steps. 30 35 40 When the optical characteristic measurement step completed by the lens meter1A,the robotarm3A moves the eyeglass lens from the first installation position 10A of the lens meter 1A to the second installation position 10B ofthe cup attachment device 1B at the second work position P2.Thereafter, the robotarm 3A moves the arm unit 30 itself to the first work position P1 in preparation for the subsequent process of the eyeglass lens. [0061] Furthermore, in the present embodiment, the standby position 8 and the completion position 9 of the eyeglasslenstogetherwith the plurality ofeyeglassman- ufacturing devices 1 are provided to surround the robot arm 3 along the circumferential direction round on the pivotaxisX1.Specifically,inthe orderofmoving the eye- glass lens (that is, the order of the standby position 8, the lens meter 1A, the cup attachment device 1B, the lens processing device 1C, and the completion position 9), the respective positions are disposed clockwise or counterclockwise (clockwise in the present embodi- ment).Therefore,a space forinstalling the eyeglasslens peripheral edge processing system 100 can be further reduced. [0058] When the cup attachment step is completed by the cup attachment device 1B, the robot arm 3B moves the eyeglass lens from the second installation position 10B of the cup attachment device 1B to the third instal- lation position 10C of the lens processing device 1C, in a state where the arm unit 30 itself is moved to the third work position P3 in the vicinityoftheplurality ofeyeglass manufacturing devices 1. When the processing step of processing the eyeglass lensperipheraledge iscomplet- ed by the lens processing device 1C, the robot arm 3B holds the eyeglass lens installed at the third installation position 10C ofthe lens processing device1C atthethird work position P3. Thereafter, the arm unit 30 itself i moved to a fourth work position P4 in the vicinity of the completion position 9, and the eyeglass lens is placed on the tray at the completion position 9. [0062] ReferringtoFIGs.3A and3B,a position storing process performed by the eyeglass lens peripheral edge processing system 100 according to the presentembod- iment will be described. In the position storing process, aprocessofstoring a plurality ofpositions (storingtarget 55 50 45 (Position Storing Process) (Disposition of Each Device) [0059] Referring to FIG. 1, disposition of each device 11