Patent Publication Number: US-8113912-B2

Title: Eyeglass lens processing apparatus

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to an eyeglass lens processing apparatus for processing an eyeglass lens. 
     An eyeglass lens processing apparatus is known in which an eyeglass lens chucked between lens chucks (lens rotary shafts) is processed by a roughing grindstone and a finishing grindstone disposed in a processing chamber. Such an apparatus includes grinding water supply means for supplying cooling grinding water to a contact portion between the grindstone and the lens so as to reduce a heat generated during a processing of the lens and to clean processing refuse attached to the lens. Additionally, since the processing refuse of the lens flies in the processing chamber due to a rotation of the grindstone or are accumulated in a drainage port provided at the bottom portion of the processing chamber during the processing of the lens (particularly, in case of a polycarbonate lens, etc. requiring a heat during the processing), some apparatuses include cleaning water supply means for flowing cleaning water to the downside of the processing chamber. 
     As a method of supplying a water to the inside of the processing chamber, there are known a water circulation type in which the water stored in a water tank is supplied by use of a pump and a water pipe direct connection type in which an electromagnetic valve is attached to a pipe extending from a water pipe and the water is directly supplied in terms of a water pressure of the water pipe. 
     Additionally, since drainage of the processing chamber contains the processing refuse, some apparatuses include a filter device such as a centrifugal separator for separating the water from the processing refuse. Such a filter device should be necessarily used in the water circulation type, and needs to be desirably used in the water pipe direct connection type. 
     In the known apparatus, since the cleaning water is supplied from the cleaning water supply means at a normal time during the processing of the lens irrespective of the material of the lens, a problem arises in that a water consumption amount is large. In order to improve the filtering (dewatering) efficiency by restricting a discharge of the dirty drainage upon using the filter device, it is desirable to reduce the water consumption amount during the processing. 
     SUMMARY OF THE INVENTION 
     A technical object of the invention is to provide an eyeglass lens processing apparatus capable of reducing a water consumption amount. Further, a technical object of the invention is to provide an eyeglass lens processing apparatus capable of improving the filtering (dewatering) efficiency of a filter device by restricting a discharge of dirty drainage. 
     In order to achieve the object, the present invention provides the following arrangements.
     (1) An eyeglass lens processing apparatus comprising:   

     a processing chamber in which a lens chuck for holding an eyeglass lens and a roughing grindstone and a finishing grindstone for processing the lens are provided; 
     a grinding water supply unit which includes a first nozzle for ejecting grinding water, the grinding water ejected from the first nozzle being sprayed toward a processing point of the lens processed by the grindstones, a first tube for supplying the grinding water from a water service pipe or a water tank to the first nozzle, and a first switch unit for turning on/off a supply of the grinding water to the first nozzle; 
     a cleaning water supply unit which includes a second nozzle for ejecting cleaning water, the cleaning water ejected from the second nozzle cleaning processing refuse of the lens scattered in the processing chamber, a second tube for supplying the cleaning water from the water service pipe or the water tank to the second nozzle, and a second switch unit for turning on/off a supply of the cleaning water to the second nozzle; 
     a lens material selection unit which inputs a selection signal for a material of the lens; and 
     a control unit which controls each driving of the first and second switch units on the basis of the selection signal for the material of the lens, 
     wherein on the basis of the selection signal indicating plastic, the control unit controls the first switch unit to turn on the supply of the grinding water in whole processing processes, and controls the second switch unit to turn off the supply of the cleaning water in the whole processing processes or temporarily turn on the supply of the cleaning water for a short time compared to the whole processing processes.
     (2) The eyeglass lens processing apparatus according to (1), wherein the first switch unit includes a first electromagnetic valve or a first suction pump.   (3) The eyeglass lens processing apparatus according to (1), wherein the second unit is a second electromagnetic valve or a second suction pump.   (4) The eyeglass lens processing apparatus according to (1), wherein on the basis of the selection signal indicating the plastic, the control unit controls the second switch unit to temporarily turn on the supply of the cleaning water after ending the whole processing processes or each processing process or temporarily turn on the supply of the cleaning water during the whole processing processes or each processing process.   (5) The eyeglass lens processing apparatus according to (1), wherein on the basis of the selection signal indicating polycarbonate or trivex, the control unit controls the first switch unit so that the supply of the grinding water is turned off in a roughing and a first-stage finishing and the supply of the grinding water is turned on in a second-stage finishing, and controls the second switch unit so that the supply of the cleaning water is turned on in the roughing or the roughing and the first-stage finishing and the supply of the cleaning water is substantially turned off in the second-stage finishing.   (6) The eyeglass lens processing apparatus according to (5), wherein the control unit controls the second switch unit to temporarily turn on the supply of the cleaning water after or just before ending the second-stage finishing.   (7) The eyeglass lens processing apparatus according to (1), wherein on the basis of the selection signal indicating acryl, the control unit controls the first switch unit so that the supply of the grinding water is turned on in a roughing, the supply of the grinding water is turned off in a first-stage finishing, and the supply of the grinding water is turned on in a second-stage finishing, and controls the second unit so that the supply of the cleaning water is turned off in the roughing, the supply of the cleaning water is turned on in the first-stage finishing, and the supply of the cleaning water is substantially turned off in the second-stage finishing.   (8) The eyeglass lens processing apparatus according to (7), wherein the control unit controls the second switch unit to temporarily turn on the supply of the cleaning water after or just before ending the second-stage finishing.   

    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematic external diagram showing an eyeglass lens processing apparatus according to an embodiment of the invention. 
         FIG. 2  is a schematic configuration diagram showing a lens processing portion. 
         FIG. 3  is a schematic configuration diagram showing a chamfering-grooving portion. 
         FIG. 4  is a schematic configuration diagram showing a water supply mechanism and a filter mechanism. 
         FIG. 5  is a schematic block diagram showing a water treatment control system of the processing apparatus having a water treatment device. 
         FIGS. 6A ,  6 B, and  6 C are water-supply timing charts of a plastic lens, a polycarbonate lens, and an acryl lens, respectively. 
         FIG. 7  is a diagram showing a configuration of an apparatus according to a modified example. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     Hereinafter, an exemplary embodiment of the invention will be described with reference to the accompanying drawings.  FIG. 1  is a schematic external diagram showing an eyeglass lens processing apparatus  1  according to the embodiment of the invention. The processing apparatus  1  is connected to an eyeglass frame shape measurement device  2 . As the measurement device  2 , for example, the device disclosed in U.S. Pat. No. 5,347,762 (JP-A-H05-212661) may be used, and thus the description thereof will be omitted. A display unit  5  and a switch unit  7  are provided in the upper portion of the processing apparatus  1 . The display unit  5  has a touch panel function, and serves as display means for displaying processing information and input means for inputting a processing condition, etc. A window  6  is opened or closed so that a lens is disposed in a processing chamber  20  (see  FIG. 4 ) and a lens is taken out from the processing chamber  20   
     A water treatment device  3  having a centrifugal separator  650  (see  FIG. 4 ) is disposed below the processing apparatus  1 . Drainage containing processing refuse produced from the processing apparatus  1  during the processing of the lens is introduced into the water treatment device  3  via a drainage pipe  3   a.    
       FIG. 2  is a schematic configuration diagram showing a lens processing portion disposed in the processing apparatus  1 . A carriage portion  100  is disposed on a base  170  of the processing apparatus  1 , and a lens LE interposed between lens chucks (lens rotary shaft)  102 L and  102 R constituting a carriage  101  of the carriage portion  100  is subjected to a grinding using a grindstone  162  attached to a grindstone spindle (grindstone rotary shaft)  161   a  rotated by a motor  160 , etc. The grindstone  162  includes a roughing grindstone  162   a  for plastic, a finishing grindstone  162   b  having a bevel-finishing groove and a flat-finishing surface, a polish-finishing grindstone  162   c  having a bevel-polish-finishing groove and a flat-polish-finishing surface, and a roughing grindstone  162   d  for glass. 
     The lens chuck  102 L and the lens chuck  102 R are coaxially held in a left arm  101 L and a right arm  101 R of the carriage  101 , respectively, so as to be rotatable. The lens chuck  102 R is moved toward the lens chuck  102 L by a motor  110  attached to the right arm  101 R, and the lens LE is clamped between the lens chucks  102 R and  102 L. The lens chucks  102 R and  102 L are rotated in a synchronizing manner by a motor  120  attached to the left arm  101 L. 
     Shafts  103  and  104  are fixed to the base  170  so as to extend in an X direction in parallel to the lens chucks  102 R and  102 L and the spindle  161   a , and a movement support base  140  is held thereto so as to be movable along the shafts  103  and  104 . Shafts  156  and  157  are fixed to the support base  140  so as to extend in a Y direction in which a distance between the rotation axes of the lens chucks  102 R and  102 L and the spindle  161   a  varies, the carriage  101  is held thereto so as to be movable along the shafts  156  and  157 . The support base  140  is moved by a motor  145  in the X direction, and the carriage  101  disposed on the support base  140  is moved in the X direction. The carriage  101  is moved by a motor  150  in the Y direction. Accordingly, the lens LE clamped between the lens chucks  102 L and  102 R is moved in the X direction and in the Y direction. 
     A chamfering-grooving portion  200  is disposed in front of the processing apparatus  1 .  FIG. 3  is a schematic configuration diagram showing the chamfering-grooving portion  200 . A lens front-edge chamfering grindstone  221   a , a lens rear-edge chamfering grindstone  221   b , a lens front-edge polish-chamfering grindstone  223   a,  a lens rear-edge polish-chamfering grindstone  223   b , and a grooving grindstone  224  are coaxially attached to a grindstone spindle (grindstone rotary shaft)  230  rotatably held in an arm  220 . The spindle  230  is rotated by a motor  221 , and is moved between a retraction position and a processing position by a motor  205 . The processing position of the spindle  230  is a position in which the rotation axis of the spindle  230  is in parallel to the rotation axis of the lens chucks  102 R,  102 L and the spindle  161   a  between the lens chucks  102 R,  102 L and the spindle  161   a  in a plane in which the rotation axes of the lens chucks  102 R,  102 L and the spindle  161   a  are located. In the same manner as the processing of the grindstone  162 , in the processing of the chamfering-grooving portion  200 , the lens LE is moved by the motor  145  in the X direction, and the lens LE is moved by the motor  150  in the Y direction. 
     The inner upper portion (upper portion of the carriage  101 ) of the processing apparatus  1  is provided with a lens front-edge position measurement portion (lens front shape measurement portion)  300 F for measuring a lens front-edge position (lens front-edge path) and a lens rear-edge position measurement portion (lens rear shape measurement portion)  300 R for measuring a lens rear-edge position (lens rear-edge path). As the measurement portions  300 F and  300 R, for example, the measurement portion disclosed in U.S. Pat. No. 6,790,124 (JP-A-2003-145328) may be used, and the description thereof will be omitted. 
     Next, a water supply mechanism for supplying water (grinding water and cleaning water) to the processing apparatus  1  and a filter mechanism for filtering drainage produced from the processing apparatus  1  during the processing of the lens LE will be described.  FIG. 4  is a schematic configuration diagram showing the water supply mechanism and the filter mechanism. 
     An inner wall  21   a  on the right side (inner side of  FIG. 4 ) of the processing chamber  20  in which the grindstone  162  is disposed is provided with a nozzle  600  for ejecting the grinding water to a contact portion (processing point) between the grindstone  162  and the lens LE. An ejection port of the nozzle  600  faces a direction in which the ejected grinding water goes past by a surface of the grindstone  162 . The inner wall  21   a  on the inner side (left side of  FIG. 4 ) of the processing chamber  20  is provided with a nozzle  610  for ejecting the cleaning water cleaning the inside of the processing chamber  20 . The nozzle  610  is disposed above the grindstone  162 . An ejection port of the nozzle  610  slightly faces the downside so as to clean processing refuse scattered in the processing chamber  20  and produced by the rotation of the grindstone  162  during the processing of the lens LE. Drainage containing the processing refuse is discharged from a drainage port  21  provided in the bottom portion of the processing chamber  20  via the drainage pipe  3   a.    
     A tube  601  is connected to the nozzle  600 , and the tube  601  is connected to a water supply pipe  9  via an electromagnetic valve  602 . The nozzle  600 , the tube  601 , the electromagnetic valve  602 , and the like constitute a first water supply unit for supplying the cooling grinding water. The nozzle  610  is connected to a tube  611 , and the tube  611  is connected to the water supply pipe  9  via an electromagnetic valve  612 . The nozzle  610 , the tube  611 , the electromagnetic valve  612 , and the like constitute a second water supply unit for supplying the cleaning water. The water supply pipe  9  is connected to a water service pipe. The electromagnetic valves  602  and  612  is controlled to be opened or closed by a control unit  50  (see  FIG. 5 ) described below. The electromagnetic valves  602  and  612  may be provided in a faucet of the water supply pipe  9  or water service pipe. 
     Since the cleaning water ejected from the nozzle  610  is used to clean the processing refuse attached to the inner wall  21   a  or the bottom surface of the processing chamber  20 , the cleaning water is ejected so as to be broadly diffused. 
     A housing  640  of the water treatment device  3  is provided with the centrifugal separator  650  as the filter mechanism of the drainage, a water collection case  642 , and a water tank  630 . The drainage pipe  3   a  of the processing apparatus  1  is connected to a drainage pipe  641  of the housing  640 . The drainage pipe  641  is attached to a top plate (upper surface) of the housing  640  so as to be located at the rotation center of the centrifugal separator  650 . 
     The centrifugal separator  650  includes a motor  653  attached to the lower portion of the housing  640 , a rotary shaft  651  connected to the motor  653 , and a dewatering bin  652  attached to the rotary shaft  651 . In the bottom portion of the dewatering bin  652 , a center portion thereof is higher than a peripheral portion thereof. 
     An annular filter  654  for filtering the drainage is fixed to the upper portion of the dewatering bin  652  by a circular disk-shaped fixed member  655 . The filter  654  has a mesh structure in which the water is transmitted and the processing refuse are hardly transmitted. 
     A drainage filtering operation using the centrifugal separator  650  will be simply described. The drainage containing the processing refuse produced from the processing apparatus  1  (processing chamber  20 ) is introduced into the dewatering bin  652  of the centrifugal separator  650  via the drainage pipe  3   a  and the drainage pipe  641 . When the dewatering bin  652  is rotated by the motor  653 , the processing refuse contained in the drainage are accumulated in the inner side of the dewatering bin  652 , and the water separated from the processing refuse is sent to the upper outer side of the dewatering bin  652  so that the water is filtered by the filter  654  and is collected in the water collecting case  642 . The water collected in the water collecting case  642  is first collected in the water tank  630  via a drainage pipe  643 , and then is discharged to sewerage via a drainage pipe  8 . 
     With the above-described configuration, the drainage containing the processing refuse produced from the processing apparatus  1  is separated into the water and the processing refuse in terms of the filtering (centrifugal separation), and the cleaned water is discharged to the sewerage via the drainage pipe  8 . 
       FIG. 5  is a schematic block diagram showing a water treatment control system of the processing apparatus  1  having the water treatment device  3 . When a power supply switch  60  is turned on, electric power is supplied to the processing apparatus  1 . Since a power supply cable of the centrifugal separator  650  is configured to be connectable to a power supply outlet  61  of the processing apparatus.  1 , when the power supply switch  60  is turned on, the electric power is supplied to the centrifugal separator  650 . The processing apparatus  1  is provided with power supply outlets  62  and  63  to which power supply cables of the electromagnetic valves  602  and  612  are connected. Relay switches  64  and  65  are provided in the course of the power supply lines of the power supply outlets  62  and  63 . When the control unit  50  of the processing apparatus  1  turns on/oft the relay switches  64  and  65 , the electromagnetic valves  602  and  612  are opened or closed. 
     A control unit  70  of the centrifugal separator  650  is connected to the control unit  50  via a signal connection gate  67 . The control unit  70  is connected to a motor  653 , an indicator  72  for displaying the number of sheets of the processing lenses, and the like. 
     An operation of the apparatus with the above-described configuration will be described. First, a processing condition for the lens LE is input. Data on a target lens shape (target outline) such as an eyeglass frame, a template (pattern), and a dummy lens (model lens) obtained by the measurement device  2  is input by an operation of the switch unit  7  and is stored in a memory  51 . The figures of the obtained left and right target lens shapes are displayed on a screen  501  of the display unit  5 . Layout data such as a wearer&#39;s pupillary distance (PD), a distance between centers of the left and right target lens shapes (FPD), and a height of an optical center with respect to the center of the target lens shape is input in terms of an operation of a layout key  502 . In terms of a lens material selection key  503   a , plastic, polycarbonate, trivex, acryl, glassy and the like are selected as the material of the lens LE to be processed. Additionally, in terms of a process mode selection key  503   b , any one of a bevel-finishing mode, a flat-finishing mode, and a grooving mode is selected In terms of a processing mode selection key  503   c , it is selected whether the polish-finishing is carried out. In terms of a processing mode selection key  503   d , it is selected whether the chamfering is carried out. 
     Next, the supply of the grinding water and the cleaning water in accordance with the material of the lens LE will be described with reference to  FIGS. 6A to 6C .  FIG. 6A  is a water-supply timing chart in a case of a plastic lens,  FIG. 6B  is a water-supply timing chart in a case of a polycarbonate lens, and  FIG. 6C  is a water-supply timing chart in a case of an acryl lens. In the processing shown in  FIGS. 6A to 6C , the grooving mode (roughing+flat-finishing+grooving) is selected, and additionally the chamfering is carried out. 
     &lt;Plastic Lens Processing&gt; 
     When plastic is selected as the material of the lens LE, the control unit  50  reads out a processing control program for processing the plastic lens from the memory  51 , and starts the processing process. 
     When a start switch of the switch unit  7  is pressed after the lens LE is clamped between the lens chucks  102 L and  102 R, the measurement portions  300 F and  300 R measure the front and rear edge positions of the lens LE on the basis of the target lens shape data. 
     At this time, the control unit  50  transmits a processing start signal to the control unit  70  on the basis of an input signal of the start switch. The control unit  70  transmits a command signal to the motor  653  on the basis of the processing start signal output from the control unit  50 , and starts a rotation of the dewatering bin  652 . 
     When the measurement of the front and rear edge positions of the lens LE ends, the roughing continues. A position of the carriage  101  in the X direction is controlled so that the lens LE clamped between the lens chucks  102 R and  102 L is located on the roughing grindstone  162   a , and a rotation of the lens LE and a position of the carriage  101  in the Y direction are controlled on the basis of roughing data, thereby performing the roughing to the lens LE using the roughing grindstone  162   a . At this time, the roughing of the lens LE is carried out so that the final target lens shape has a remained (extra) portion to be processed during the finishing. 
     When the roughing ends, the finishing continues. When the grooving mode is selected, the flat-finishing is performed to the lens LE, having been subjected to the roughing, using the flat-finishing surface: of the finishing grindstone  162   b . Subsequently, the grooving grindstone  224  moves to the processing position, and a rotation of the lens LE and a position of the carriage  101  in the X and Y directions are controlled on the basis of the grooving data based on the groove path data (which is calculated in the same manner as the bevel path data), thereby forming a groove in the edge surface of the lens LE, having been subjected to the flat-finishing, using the grooving grindstone  224 . When the chamfering is selected, additionally, the front and rear edge angles of the lens LE are chamfered by the chamfering grindstones  221   a  and  221   b.    
     In addition, when the bevel-finishing mode is selected, a rotation of the lens LE and a position of the carriage  101  in the X and Y directions are controlled on the basis of the bevel-finishing data based on the bevel path data, and a bevel is formed in the edge of the lens LE, having been subjected to the roughing, in terms of the bevel-finishing groove of the finishing grindstone  162   b.  The bevel path data is calculated by a general method on the basis of the measurement data of the front and rear edge positions of the lens LE and the target lens shape data. In the above-described processing processes, when plastic is selected as the material of the lens LE, as shown in  FIG. 6A , the electromagnetic valve  602  is opened by the control unit  50  on the basis of a roughing start signal upon starting the roughing, and the grinding water starts to be supplied from the nozzle  600 . In case of the plastic lens LE, since the processing refuse are prevented to be attached to the grindstone  162  and the lens LE by cooling the processing portion of the lens LE during the processing, it is possible to perform the processing with high precision. Basically, the grinding water is supplied at a normal time during each processing (the supply of the grinding water may stop temporarily upon moving to another processing). Then, the supply of the grinding water stops on the basis of an end signal of the final processing (here, the chamfering). 
     Meanwhile, the supply of the cleaning water from the nozzle  610  does not start even when the roughing start signal is generated. As shown in  FIG. 6A , the electromagnetic valve  602  is opened when the final processing process ends (before or after the final processing ends), and the cleaning water is temporarily supplied for a predetermined time t 1  (for example, 5 sec or so). For example, the supply of the cleaning water starts on the basis of a final processing process progress state (at the time the remaining processing amount becomes a predetermined amount), and the supply of the cleaning water stops on the basis of the end signal. 
     In case of the plastic lens LE, the processing refuse scattered in the processing chamber  20  and produced by the rotation of the grindstone  162  is in a form of powder, and the powder-like processing refuse accumulated in the bottom surface of the processing chamber  20  are flown together with the grinding water supplied from the nozzle  600  in a dissolved state. For this reason, even when the cleaning water is not supplied from the nozzle  610 , the drainage containing the processing refuse is discharged via the drainage pipe  3   a  without blocking the drainage port  22  provided at the bottom portion of the processing chamber  20 . 
     Additionally, in case of the plastic lens LE, the cleaning water may not be supplied from the nozzle  610  during the whole processing processes, but it is desirable to supply the cleaning water for cleaning the inner wall  21   a  of the processing chamber  20  at a stage when the processing of the lens LE ends as described above. Alternatively, the supply of the cleaning water may start on the basis of the final processing process end signal, and the supply of the cleaning water may stop after the predetermined time t 1 . Alternatively, the supply of the cleaning water may start on the basis of each processing process end signal (a signal moving to the next processing), and the supply of the cleaning water may stop after the predetermined time t 1 . That is, the cleaning water may be temporarily supplied after the whole processing processes or during each of processing processes. 
     As described above, in case of the processing process of the plastic lens LE, since the supply of the cleaning water of the nozzle  610  stops or temporarily continues for a short time, it is possible to remarkably save the water consumption amount. Since an amount of the drainage flowing to the centrifugal separator  650  during the processing process is reduced, it is possible to improve the separating efficiency (filtering (dewatering) efficiency) in which the water is separated from the processing refuse using the centrifugal separator  650 . Further, it is possible to reduce an amount of the drainage discharged to the sewerage. 
     &lt;Polycarbonate Lens Processing&gt; 
     When polycarbonate is selected as the material of the lens LE, the control unit  50  reads out a processing control program for processing the polycarbonate lens from the memory  51 , and starts the processing process. The description of the same processing process as that of the plastic lens will be omitted. 
     In the polycarbonate lens LE as thermoplastic resin, since a heat is necessary for processing the lens LE, the process is classified into a first stage of performing the processing process while stopping the supply of the grinding water and a second stage of performing the processing process while continuing the supply of the grinding water in order to remove burnt deposit formed in the processing portion of the lens LE. 
     As shown in  FIG. 6B , in a state where the grinding water is not supplied from the nozzle  600  after the front and rear edge positions of the lens LE are measured, a roughing using the roughing grindstone  162   a , a first-stage finishing using the finishing grindstone  162   b , a first-stage grooving using the grooving grindstone  224 , and a first-stage chamfering using the chamfering grindstones  221   a  and  221   b  are carried out. In the first-stage processing processes, the processing is carried out so that an extra portion is processed during a second-stage burnishing. When the first-stage final processing process (here, the chamfering) ends, a second-stage finishing using the finishing grindstone  162   b , a second-stage grooving using the grooving grindstone  224 , and a second-stage chamfering using the chamfering grindstones  221   a  and  221   b  are carried out. In the second-stage processing processes, the electromagnetic valve  602  is opened by the control unit  50  on the basis of the start signal, and the supply of the grinding water of the nozzle  600  starts. In the second-stage finishing of the polycarbonate lens, a heat of the processing portion of the lens LE reduces by supplying the grinding water, and the processing is carried out so as to be burnished. In the second-stage grooving and the second-stage chamfering, in the same manner, the processing is carried out so as to be burnished by supplying the grinding water. 
     As described above, in the polycarbonate lens LE, since the processing in the roughing and the first-stage processing processes cannot be carried out with high precision when a heat of the processing portion of the lens LE is not high, the supply of the grinding water stops. Meanwhile, the processing refuse of the polycarbonate lens LE is different from that of the plastic lens LE in that the processing refuse are attached to the inner wall,  21   a , etc. of the processing chamber  20  to be a lump and the lump of the processing refuse is easily accumulated in the bottom surface of the processing chamber  20 . When the lump of the processing refuse is directly accumulated in the drainage port  22 , the drainage port  22  may be blocked. In order to prevent such a blocking, the electromagnetic valve  612  is controlled by the control unit  50  to be opened or closed so that the cleaning water is supplied from the nozzle  610  from the roughing start time to the first-stage chamfering end time (during a time when the grinding water is not supplied from the nozzle  600 ). Then, when the grinding water is supplied from the nozzle  600  after the second-stage finishing starts, the supply of the cleaning water of the nozzle  610  stops. In the second-stage processing processes, since the processing refuse are hardly produced, the processing refuse are not accumulated or the drainage port  22  is not blocked. Additionally, the cleaning water is supplied during at least the roughing, but since the processing refuse are hardly produced in the first-stage processing processes, the supply of the cleaning water may stop from the first stage. In this case, the supply of the cleaning water may stop on the basis of the roughing end signal. 
     By stopping the supply of the cleaning water in this manner, it is possible to save the water consumption amount. Since the drainage amount of the processing apparatus  1  is reduced, it is possible to improve the separating efficiency (filtering (dewatering) efficiency) using the centrifugal separator  650 . Additionally, in the same manner as the plastic lens, the cleaning water may be temporarily supplied from the nozzle  610  so as to clean the processing chamber  20  for a predetermined time t 2  (for example, 5 sec or so) before or after the final processing process ends or when the final processing process ends without a large variation in the water consumption amount. 
     Additionally, since the trivex is thermoplastic resin requiring a heat during the processing process in the same manner as the polycarbonate lens, and the material may be substantially subjected to the same processing sequences as that of the polycarbonate, even when the trivex is selected as the material of the lens LE, the supply of the grinding water and the cleaning water is controlled in the same manner as the case of the polycarbonate. 
     &lt;Acryl Lens&gt; 
     A point different from the case in which the polycarbonate lens is selected will be described. Since acryl has the lower melting point than that of the polycarbonate, the grinding water is supplied during the roughing. Subsequently, the first-stage finishing, the first-stage grooving, and the first-stage chamfering without the supply of the grinding water are carried out. Subsequently, for the burnishing, the second-stage finishing, the second-stage grooving, and the second-stage chamfering with the supply the grinding water are carried out. Since the grinding water is supplied during the roughing, the supply of the cleaning water stops during this time then, in the respective processing processes without the supply of the grinding water, the cleaning water is supplied so as to clean the scattered processing refuse. In the respective processing processes with the supply of the grinding water, the supply of the cleaning water stops again. 
     &lt;Glass Lens&gt; 
     When glass is selected as the material of the lens LE, in the same manner as the general method, basically, the grinding water and the cleaning water are supplied during the roughing and finishing. Upon processing the glass lens, the processing refuse of the glass lens is scattered in the processing chamber  20  in a form of glass pieces due to the rotation of the grindstone  162 . When the cleaning water is not supplied, the glass pieces (processing refuse) are scattered in the processing chamber  20  to be attached to the window  6 . For this reason, in case of the glass lens, in the same manner as the general method, it is desirable to supply both the grinding water and the cleaning water at a normal time during the processing process. 
     As described above, on the basis of the start signal and the end signal of each processing process, the supply of the grinding water and the cleaning water is controlled to be turned on/off, and the supply pattern of the grinding water and the cleaning water changes in accordance with the material of the lens LE, thereby reducing the water consumption amount of the apparatus  1 . Accordingly, it is possible to reduce a cost of the service water and to reduce an amount of the drainage discharged to the sewerage. 
     Since the drainage amount for each sheet of the lens is reduced, a density of the processing refuse contained in the drainage increases, thereby improving the separating efficiency (filtering (dewatering) efficiency) in which the water is separated from the processing refuse using the centrifugal separator  650 . Accordingly, it is possible to reduce the processing refuse contained in the drainage discharged to the sewerage. 
     As described above, although a case has been described in which the grooving and the chamfering are set as well as the roughing and the finishing, in the settings until the finishing in which the grooving and the chamfering are not set, the final processing process end is controlled by the finishing end. 
     Next, a modified example of the configuration of the apparatus shown in  FIG. 1  will be described with reference to  FIG. 7 . The exemplary configuration of the apparatus shown in  FIG. 7  corresponds to a case in which the water supply mechanism is configured as a circulation-type mechanism. A deodorization device  700  is additionally provided so as to remove a bad odor generated during the processing process of the plastic lens (particularly, a high-refraction lens). For the brief explanation, the above-described components are schematically shown. 
     One end portion of an exhaust pipe  701  is connected to the processing chamber  20  of the processing apparatus  1 , and the other end portion of the exhaust pipe  701  is connected to a deodorization chamber  703  provided with a deodorization filter  705  and an exhaust fan  707 . When the exhaust fan  707  rotates, air containing the bad odor in the processing chamber  20  is sucked via the exhaust pipe  701 . Then, the air containing the bad odor, reduced by the deodorization filter  705 , is discharged to the outside. 
     The water tank  630  is disposed in the water treatment device  3 , and a suction pump  670  is provided instead of the electromagnetic valve  602 , and a suction pump.  672  is provided instead of the electromagnetic valve  612 , respectively. In terms of the suction pump  670 , the water stored in the water tank  630  is supplied to the nozzle  600  via the tube  601 . In terms of the suction pump  672 , the water stored in the water tank  630  is supplied to the nozzle  610  via the tube  611 . A power supply cable of the suction pump  670  is connected to the power supply outlet  62  of the processing apparatus  1  The power supply outlet  63  of the processing apparatus  1  is connected to a power supply inlet  710  of the deodorization device  700  via a cable. A power supply cable of the suction pump  672  is connected to a power supply outlet  714  of the deodorization device  700 , and the power supply inlet  710  and the power supply outlet  714  are connected to a relay switch  712 . A timer  716  is connected to the relay switch  712 , and an operation of the timer  716  starts at a time point when electric power is supplied from the processing apparatus  1 . The exhaust fan  707  is driven by the timer  716 , and the driving of the exhaust fan  707  stops by the timer  716  after a predetermined time. 
     In this modified example, instead of the electromagnetic valves  602  and  612  shown in  FIG. 1 , the pump  670  constituting a grinding water supply unit and the pump  672  constituting a cleaning water supply unit are controlled by the control unit  50 . 
     Further, in the above-described embodiment, the supply stop of the grinding water and/or the cleaning water includes a case in which the grinding water and/or the cleaning water are/is supplied from the nozzle  600  and/or  610  without a large variation in the water consumption amount. Furthermore, in the above-described embodiment, although the cleaning water supplied from the nozzle  610  is mainly used to clean the inner wall  21   a  of the processing chamber  20 , the invention is not limited thereto, but the cleaning water may be used to clean, for example, the bottom surface of the processing chamber  20 .