JP5172190B2 - Eyeglass lens processing equipment - Google Patents

Description

  The present invention relates to a spectacle lens processing apparatus that processes the peripheral edge of a spectacle lens.

  In the peripheral processing of the spectacle lens, the peripheral edge of the spectacle lens held by the two lens chuck shafts of the spectacle lens processing apparatus is roughly processed with a rough grindstone and then finished with a finishing grindstone or the like (see Patent Document 1). ). When holding a lens on two lens chuck shafts, a cup as a processing jig is fixed to the surface of the lens using a blocker, and then one lens chuck shaft has the base of the cup. The lens is attached to the cup holder and held by the lens presser of the other lens chuck shaft.

  The lens being processed is subjected to a load by receiving a reaction force and a rotational force from the grindstone. For this reason, when processing a lens having a large target lens shape, a large-diameter cup having a large mounting area is used so that a holding force by chucking can be ensured as much as possible.

In recent years, the design of eyeglass frames has been diversified, and the processing of lenses with a narrow vertical width has increased. When processing an oval lens with a narrow vertical width, if a normal large-diameter cup interferes with the processing tool, a small-diameter cup with a small vertical size on the lens mounting surface is used (for example, Patent Document 2). reference).
JP-A-11-333684 Japanese Patent Laid-Open No. 10-249692

  However, the small-diameter cup has a weaker holding force when chucking than the large-diameter cup, and the rotational moment load applied to the lens chuck shaft also increases during rough machining, especially when machining the periphery of an unprocessed lens with a large diameter. Likely to happen. Furthermore, the problem becomes more prominent in a lens coated with a water-repellent substance that is difficult to adhere water or oil.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a spectacle lens processing apparatus that can reduce the occurrence of axial misalignment even when processing the periphery of a lens having a narrow vertical width.

  In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) A spectacle lens with a lens fixing cup attached is held by a lens chuck shaft, the lens periphery is roughly processed with a roughing tool, and then the roughened lens periphery is finished from the target lens shape data. In a spectacle lens processing apparatus that finishes with a finishing tool based on the trajectory,
A processing mode setting means for setting a cup changing processing mode for processing the peripheral edge of the lens by changing the cup from a large diameter cup to a small diameter cup during the processing,
When the cup change machining mode is set, based on the first rough machining locus that is larger than the target shape data by a predetermined finishing machining allowance, and the first rough machining locus and the moving diameter of the large-diameter cup, A roughing trajectory data calculating means for calculating a second roughing trajectory having a larger radius than the radius of the large-diameter cup;
This is a processing control means for interrupting the processing operation once after the peripheral processing of the lens to which the large-diameter cup is attached based on the second rough processing trajectory by the processing start signal, and then temporarily stopping the processing. When the processing resumption signal is input, the peripheral edge of the lens replaced with the small-diameter cup is roughly processed based on the first rough processing locus and then finished based on the finishing processing locus, or directly finished. It is characterized by comprising a machining control means for performing machining processing based on a finishing machining locus by a tool or performing any machining control.
(2) In the spectacle lens processing apparatus according to (1), the rough machining trajectory data calculation means combines the first rough machining trajectory and a trajectory obtained by adding a predetermined distance Δd to the moving radius of the large-diameter cup. And correcting the portion where the first roughing trajectory and the trajectory obtained by adding the predetermined distance Δd to the moving diameter of the large-diameter cup are further corrected to avoid processing interference due to the diameter of the roughing tool. The predetermined distance Δd is a means for obtaining a roughing trajectory, and is characterized in that the predetermined distance Δd is set as a distance to avoid processing interference between the roughing tool and the large-diameter cup during roughing.

  According to the apparatus of the present invention, the occurrence of axial misalignment can be reduced even when processing the periphery of a lens having a narrow vertical width.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a processing section of a spectacle lens peripheral edge processing apparatus according to the present invention.

  A carriage unit 100 is mounted on the base 170 of the processing apparatus main body 1, and the periphery of the lens LE to be processed sandwiched between the lens chuck shafts (lens rotation shafts) 102L and 102R of the carriage 101 is attached to the grindstone spindle 161a. The grindstone group 162 is pressed and processed. The grindstone group 162 includes a plastic rough grindstone 162a (roughing tool), a bevel forming groove and a finishing grindstone 162b (finishing tool) having a flat machining surface, and a mirror finishing grindstone 162c (mirror finishing machine). This is composed of a rough grindstone 162d (rough machining tool). The grindstone spindle (grindstone rotation shaft) 161 a is rotated by a motor 160.

  A lens chuck shaft 102L is rotatably held on the left arm 101L of the carriage 101, and a lens chuck shaft 102R is rotatably held coaxially on the right arm 101R. The lens chuck shaft 102R is moved to the lens chuck shaft 102L side by the motor 110 attached to the right arm 101R, and the lens LE is held by the two lens chuck shafts 102R and 102L. Further, the two lens chuck shafts 102R and 102L are rotated synchronously by a motor 120 attached to the left arm 101L via a rotation transmission mechanism such as a gear.

  The carriage 101 is mounted on an X-axis movement support base 140 that is movable along shafts 103 and 104 extending in parallel with the lens chuck shafts 102R and 102L and the grindstone spindle 161a. A ball screw (not shown) extending in parallel with the shaft 103 is attached to the rear portion of the support base 140, and the ball screw is attached to the rotation shaft of the X-axis moving motor 145. As the motor 145 rotates, the carriage 101 together with the support base 140 is linearly moved in the X-axis direction.

  Further, shafts 156 and 157 extending in the Y-axis direction (direction in which the distance between the lens chuck shafts 102R and 102L and the grindstone spindle 161a is changed) are fixed to the support base 140. The carriage 101 is mounted on the support base 140 so as to be movable in the Y-axis direction along the shafts 156 and 157. A Y-axis moving motor 150 is fixed to the support base 140. The rotation of the motor 150 is transmitted to a ball screw 155 extending in the Y axis direction, and the carriage 101 is moved in the Y axis direction by the rotation of the ball screw 155.

  In FIG. 1, a chamfering mechanism 200 is disposed on the front side of the apparatus main body. Since a well-known chamfering mechanism unit 200 is used, the description thereof is omitted (for example, see Japanese Patent Application Laid-Open No. 2006-239782).

  In FIG. 1, lens edge position measurement units (lens surface position measurement units) 300 </ b> F and 300 </ b> R are provided above the carriage 101. FIG. 2 is a schematic configuration diagram of a measurement unit 300F that measures the lens edge position on the front surface of the lens. An attachment support base 301F is fixed to a support base block 300a fixed on the base 170 in FIG. 1, and a slider 303F is slidably attached on a rail 302F fixed to the attachment support base 301F. A slide base 310F is fixed to the slider 303F, and a probe arm 304F is fixed to the slide base 310F. An L-shaped hand 305 </ b> F is fixed to the tip of the probe arm 304 </ b> F, and a probe 306 </ b> F is fixed to the tip of the hand 305. The measuring element 306F is brought into contact with the front refractive surface of the lens LE.

  A rack 311F is fixed to the lower end portion of the slide base 310F. The rack 311F meshes with a pinion 312F of an encoder 313F fixed to the attachment support base 301F side. The rotation of the motor 316F is transmitted to the rack 311F via the gear 315F, the idle gear 314F, and the pinion 312F, and the slide base 310F is moved in the X-axis direction. During the measurement of the lens edge position, the motor 316F always presses the probe 306F against the lens LE with a constant force. The encoder 313F detects the movement position of the slide base 310F in the X-axis direction. The edge position (including the lens front surface position) of the front surface of the lens LE is measured based on the information on the movement position, the information on the rotation angles of the lens chuck shafts 102L and 102R, and the movement information in the Y-axis direction.

  The configuration of the measurement unit 300R that measures the edge position of the rear surface of the lens LE is symmetrical to the measurement unit 300F. Therefore, “F” at the end of the reference numeral attached to each component of the measurement unit 300F illustrated in FIG. The description is omitted by replacing it with “R”.

  In measuring the lens edge position, the measuring element 306F is brought into contact with the front surface of the lens and the measuring element 306R is brought into contact with the rear surface of the lens. In this state, the carriage 101 is moved in the Y-axis direction based on the lens shape data, and the lens LE is rotated, whereby the edge positions of the lens front surface and the lens rear surface for processing the lens periphery are measured simultaneously.

  In FIG. 1, a hole processing / grooving mechanism 400 is arranged behind the carriage unit 100. As described above, the configurations of the carriage unit 100, the lens edge position measuring units 300F and 300R, and the hole processing / grooving mechanism unit 400 can be basically those described in Japanese Patent Laid-Open No. 2003-145328. .

  FIG. 3 is a control block diagram of the eyeglass lens peripheral edge processing apparatus. The controller 50 has a spectacle frame shape measuring unit 2 (the one described in JP-A-4-93164 can be used), a display 5 as a touch panel type display unit and an input unit, a switch unit 7, a memory 51, and a sound generator. The means 55, the carriage unit 100, the chamfering mechanism unit 200, the lens edge position measuring units 300F and 300R, the hole processing / grooving mechanism unit 400, and the like are connected. An input signal to the device can be input by touching the display 5 with a touch pen (or a finger). The control unit 50 receives an input signal through a touch panel function of the display 5 and controls display of graphics and information on the display 5. The switch unit 7 is provided with a start switch 7a for inputting a processing start signal for starting lens peripheral processing.

  Next, a configuration in which the lens LE is held by the lens chuck shafts (lens rotation shafts) 102L and 102R will be described. FIG. 4 is a diagram showing the configuration of the cup holder and lens presser that hold the lens LE by the lens chuck shafts 102L and 102R. FIG. 4A is a diagram showing a cup holder and a lens presser when the large-diameter cup 730 shown in FIG. 6 or the large-diameter cup 630 described later is used. A cup holder 600 is detachably attached to the tip of the lens chuck shaft 102L with a set screw, and a lens presser 610 is detachably attached to the tip of the lens chuck shaft 102R with a set screw. A large-diameter cup 630 is fixed to the front surface of the lens LE via a double-sided adhesive tape 620. Since the attachment structure of the cup holder 600 to the lens chuck shaft 102L and the attachment structure of the lens retainer 610 to the lens chuck shaft 102R are well known, description thereof will be omitted.

  FIG. 4B is a view showing a cup holder 700 and a lens presser 710 when a small-diameter cup 640 described later is used. The cup holder 700 is detachably attached to the lens chuck shaft 102L with a set screw instead of the cup holder 600. The lens retainer 710 is also detachably attached to the lens chuck shaft 102R with a set screw instead of the lens retainer 610. The cup holder 700 and the lens retainer 710 are smaller in diameter than the cup holder 600 and the lens retainer 610 in FIG. 4A, and are approximately the same size as the outer diameter of the small diameter cup 640 (periphery of the flange 642 shown in FIG. 5). Is formed. For this reason, even when processing a lens having a narrow vertical size, processing can be performed to the vicinity of the minimum size of the small-diameter cup 640 without causing processing interference with the grindstone.

  The configuration of the cup 630 will be described with reference to FIG. The cup 630 has a double structure of a small-diameter cup 640 used when processing a lens having a narrow vertical width and a supporter 650 that is put on the cup 630. When the cup 630 is integrated by a combination of the small-diameter cup 640 and the supporter 650, the cup 630 is large. Used as a diameter cup. FIG. 5A is a diagram showing a state where the small-diameter cup 640 and the supporter 650 are integrated, and FIG. 5B is a diagram showing a state where the small-diameter cup 640 and the supporter 650 are separated. FIG.5 (c) is the figure which looked at the supporter 650 from the direction of the bottom face.

  The small-diameter cup 640 includes a base 644 that is inserted into the insertion hole 601 of the cup holder 600 attached to the lens chuck shaft 102L, a small-diameter collar 642 that extends around the lower portion of the base 644 (the lens fixing side), Are integrally formed. The lower surface of the flange portion 642 is a fixed surface for the lens. A key groove 644 a is formed in the base 644. By fitting the key groove 644a into the key 601a formed in the insertion hole 601, the lens LE can be attached to the lens chuck shaft 102L with the axial angle (astigmatic axis angle) of the lens LE being fixed. . The insertion hole 701 and the key 701a of the cup holder 700 for the small diameter cup are formed in the same size as the insertion hole 601 and the key 601a. Even when the small diameter cup 640 is used alone, the lens LE is similarly attached to the lens chuck shaft 102L. Can be attached to.

  The collar portion 642 of the small-diameter cup 640 has an elliptical shape, and the short axis Sd642 of the collar portion 642 is 15 mm or less so that the fixing surface of the collar portion 642 with respect to the lens LE can correspond to a lens with a narrow vertical width as much as possible. Is larger than the diameter (here, 11 mm). In the present embodiment, the short axis Sd642 is 13.5 mm. The long axis Ld642 of the flange portion 642 may be the same size as the short axis Sd642, but in order to secure a holding force when attached to the cup holder 700 for a small-diameter cup, it is 18 mm longer than that in the present embodiment. ing. An uneven portion 642a that meshes with an uneven portion 703a formed on the distal end side of the cup holder 700 when the base portion 644 is inserted into the insertion hole 701 of the cup holder 700 is formed on the upper portion of the flange portion 642.

  The collar portion 656 of the supporter 650 has an elliptical shape, and an opening 654 is formed at the center thereof. The inner diameter d654 of the opening 654 is substantially equal to the outer diameter d644 of the base 644 of the small diameter cup 640 (about 11 mm), and the base 644 is inserted into the opening 654. At the bottom of the supporter 650, there is formed a fitting hole 652 that has a concave and convex shape that meshes with the concave and convex portion 642a on the flange 642 side of the small-diameter cup 640 and into which the flange 642 is fitted in a fixed relationship. . The major axis Ld652 of the fitting hole 652 is substantially the same as the major axis Ld642 of the flange portion 642, and the minor axis Sd652 is substantially the same as the minor axis Sd642 of the flange portion 642. The supporter 650 can be integrated with the small-diameter cup 640 in a fixed relationship by covering the supporter 650 from above the small-diameter cup 640 through the opening 654 and fitting the flange 642 into the fitting hole 652. Further, the depth of the fitting hole 652 is formed such that the bottom surface of the supporter 650 and the bottom surface of the small diameter cup 640 are substantially the same height when the small diameter cup 640 is fitted. Thereby, the supporter 650 and the small-diameter cup 640 can be attached to the surface of the lens LE as a large-diameter cup 630. When only the supporter 650 is removed, the small-diameter cup 640 fixed to the surface of the lens LE is left. be able to.

  In addition, an uneven portion 656 a is formed around the opening 654 on the upper surface of the flange portion 656. When the base portion 644 is inserted into the insertion hole 601 of the cup holder 600, the concave / convex portion 603a formed on the tip side of the cup holder 600 and the concave / convex portion 656a of the flange portion 656 are engaged and fitted. The outer periphery of the concavo-convex portion 656a has an elliptical shape having a long axis in the lateral direction, the long side Ld656 is 20 mm, and the short side Sd656 is 17 mm. The dimensions of Ld656 and Sd656 are the same dimensions as the outer periphery of the concavo-convex portion 756a of the integrated large-diameter cup 730 shown in FIG. 6, and the dimensions are such that the axial deviation is suppressed even during rough processing of the periphery of the lens LE. .

  On the upper surface of the flange portion 656, two hooks 658 are formed at a position away from the outer periphery of the concavo-convex portion 656a (that is, a position that does not interfere with the cup holder 600 when attached to the cup holder 600). These two hooks 658 are used for hooking with a cup peeling jig (not shown) when the supporter 650 is removed after processing using the cup 630. By using the hook 658, only the supporter 650 attached to the lens LE can be easily removed.

  The cup 630 in which the small-diameter cup 640 and the supporter 650 are integrated is attached to the surface of the lens LE via the double-sided adhesive tape 620 by a known hammering machine (blocker). The outer peripheral shape of the double-sided pressure-sensitive adhesive tape 620 is a size that substantially matches the periphery of the supporter 650. Further, when the outer periphery of the tape 620 and the peripheral edge of the supporter 650 are attached together, a cut 622 is provided at a location that substantially matches the outer periphery of the flange portion 642 of the small-diameter cup 640. When only the supporter 650 is removed from the lens LE to which the cup 630 is attached, the outer region 624 is easily removed together with the supporter 650 by the cut 622. When the lens LE is a minus lens, the vicinity of the center may be thin, so that a hole 626 having a diameter of about 5 mm is provided in the center of the tape 620 in order to reduce the load applied to the vicinity of the center of the lens LE.

  In addition, when the surface of the lens LE is treated with a water repellent coating or the like and is slippery, and when it is difficult to apply the double-sided adhesive tape 620 directly to the surface of the lens LE, a patch seal 627 is applied to the surface of the lens LE. Then, the tape 620 can be easily attached. Also in the patch seal 627, a cut edge 628 is formed at the same peripheral shape and the same position as the tape 620. Thus, when the supporter 650 is removed, the region 629 outside the cut 628 is easily removed together with the region 624 of the tape 620 and the supporter 650.

  In FIG. 4A, the peripheral shape of the cup holder 600 when using the cup 630 is substantially the same as the outer peripheral shape of the concavo-convex portion 656 a formed on the flange portion 656 of the supporter 650. Further, the peripheral shape of the lens retainer 610 is also substantially the same as the peripheral shape of the cup holder 600. If the peripheral shapes of the lens retainer 610 and the cup holder 600 are greatly different, shear stress in the direction of the lens chuck shafts 102L and 102R is generated, and there is a possibility that coating, cracking of the lens LE, and the like may occur. In order to prevent this, it is preferable that the peripheral shapes of the lens holder 610 and the cup holder 600 are substantially matched. Since the fixing surface to the lens LE is wider than the small-diameter cup 640, the cup 630 attached to the cup holder 600 is strongly held by the lens chuck shafts 102L and 102R via the cup holder 600 and the lens presser 610.

  FIG. 6 is a view showing an integral-type large-diameter cup 730 conventionally used. The shape of the integrated large-diameter cup 730 is the same as that of the cup 630 in which the supporter 650 is put on the small-diameter cup 640. The flange 756, uneven portion 756a, hook 758, base 744 and key groove 744a of the large-diameter cup 730 are the same as the flange 656, uneven portion 656a, hook 658, base 644 and key groove 644a of the cup 630, respectively. Since there is, explanation is omitted.

  Next, the processing operation of the lens periphery by the apparatus having the above configuration will be described. The eyeglass frame lens shape data (rn, θn) (n = 1, 2,..., N) measured by the spectacle frame shape measuring unit 2 is input by pressing a switch of the switch unit 7 and is input to the memory 51. Remembered. rn is the radial length data, and θn is the radial angle data. When the target lens shape data is input, the target lens shape graphic FT is displayed on the screen 500 of the display 5 based on the target lens shape data. Further, the memory 51 stores in advance data on the peripheral shape of the large-diameter cup 630 (the same applies to the large-diameter cup 730) and the peripheral shape (outer-diameter shape) of the small-diameter cup 640. On the screen 500 of the display 5, a cup graphic CsT indicating the outer diameter of the small-diameter cup 640 and a cup graphic CbT indicating the outer diameter of the large-diameter cup 630 are displayed superimposed on the target lens graphic FT.

  When the button key 501 is pressed, the numeric keypad appears (not shown), and the wearer's interpupillary distance (PD value) can be input. Similarly, it is possible to input the frame center distance (FPD value) of the spectacle frame with the button key 502 and layout data such as the height of the optical center with respect to the geometric center of the target lens shape with the button key 503. The button key 504 can be used to set the optical center mode in which the cup is attached to the optical center of the lens or the frame center mode in which the cup is attached to the geometric center of the target lens shape. The setting of the optical center mode and the frame center mode is position data of the attachment center (lens rotation center) of the cup with respect to the target lens shape. When processing a lens having a narrow vertical width, the frame center mode is selected.

  The processing conditions such as lens material, frame type, processing mode (bevel processing, flat processing, grooving processing), presence / absence of chamfering processing, etc. are also controlled by operating predetermined button keys displayed on the display 5. Can be set. If the upper and lower widths of the target lens (lens after finishing) are smaller than the outer diameter of the large-diameter cup 630, first, rough processing is performed using the large-diameter cup 630, and then finishing processing is performed instead of the small-diameter cup 640. The cup change processing mode can be set by the switch 514.

  Note that the control unit 50 may determine whether or not the cup change processing mode should be set. Based on the target lens shape data, the cup center layout data for the target lens shape (determined by the setting of the frame center mode and the optical center mode), and the outer diameter data of the large diameter cup 630 stored in the memory 51. Then, it is calculated whether the outer diameter of the large-diameter cup 630 protrudes from the target lens shape and processing interference occurs. When processing interference occurs, this is displayed on the display 5. Further, the operator can determine whether or not the cup change processing mode should be set based on the positional relationship between the target lens shape FT and the cup shape CbT displayed on the screen of the display 5.

  A normal machining operation when the outer diameter of the large-diameter cup 630 does not protrude from the target lens shape and machining interference does not occur will be briefly described. When the operator can input data necessary for machining, the operator chucks the lens LE to which the large-diameter cup 630 or 730 is attached by the cup holder 600 of the lens chuck shaft 102L and the lens presser 610 of the lens chuck shaft 102R. The start switch 7a of the switch unit 7 is pushed to operate the device. The control unit 50 activates the measurement units 300F and 300R according to the start signal, and measures the edge positions of the front surface and the rear surface of the lens LE based on the target lens shape data. In the case of the beveling mode, the edge position measurement is performed at, for example, two places on the bevel apex and the bevel bottom in the same meridian direction. When the edge positions of the lens front surface and the lens rear surface are obtained, the control unit 50 obtains the bevel locus data to be formed on the lens LE based on the target lens shape data and the edge position information as a finishing process locus according to a predetermined program. In the bevel trajectory data, for example, the bevel apex is arranged on the entire radius of the radius so that the edge thickness is divided at a predetermined ratio. Further, the control unit 50 obtains, as rough machining trajectory data, a trajectory that is increased in the radial direction by a predetermined finishing machining allowance (for example, 1 mm) with respect to the finishing machining trajectory.

  The control unit 50 controls the movement of the carriage 101 and the rotation of the lens LE based on the rough processing trajectory data, and roughly processes the periphery of the lens LE held on the lens chuck shafts 102L and 102R by the rough grindstone 162a. Subsequently, the movement of the carriage 101 is controlled based on the bevel trajectory data, and the periphery of the lens LE is beveled by the finishing grindstone 162b.

  Next, the case where the cup change processing mode is set will be described. A cup 630 is fixed on the surface of the unprocessed lens LE by a known hammer. The operator attaches the lens LE to which the cup 630 is attached to the cup holder 600 of the lens chuck shaft 102L, chucks it with the lens chuck shaft 102R to which the lens presser 610 is attached, and presses the start switch 7a of the switch unit 7. Press to operate the device.

  When the processing start signal is input, the control unit 50 determines whether or not the diameter of the unprocessed lens LE is sufficient for the processing size of the periphery of the lens before rough processing based on the target lens shape data. The measurement units 300F and 300R are operated to measure the edge positions of the front surface and the rear surface of the lens LE. The measurement trajectory at this time may be measured based on the target lens shape data in a range where the interference of the measuring elements 306F and 306R is avoided with respect to the large-diameter cup 630, and a rough machining trajectory described later can also be used. The range where the interference of the measuring elements 306F and 306R with respect to the large-diameter cup 630 is avoided in the layout data (determined by the settings of the frame center mode and the optical center mode) and the memory 51. Based on the stored outer diameter data of the large-diameter cup 630, the controller 50 calculates. In order to shorten the measurement time at this time, it is sufficient to measure the longest radial length position of the target lens shape data from the optical center of the lens. The radial data of the lens shape data with respect to the optical center of the lens is obtained from the layout data based on the height data of the optical center with respect to the geometric center of the PD, FPD and target lens. In the case where the geometric center of the target lens shape differs from the lens rotation center, the target lens shape data is used as shape data converted with respect to the lens rotation center.

  When the lens diameter is insufficient by measuring the lens edge position, a warning message to that effect is displayed on the display 5. If the lens diameter is sufficient, then the control unit 50 calculates rough machining trajectory data, and roughly processes the periphery of the unprocessed lens with a roughing tool.

  The calculation of rough machining locus data will be described with reference to FIG. In FIG. 7A, 800 indicates a target lens shape, and 630T indicates the outer diameter (cup outer diameter) of the large-diameter cup 630. The center of the cup outer diameter 630T (the center of lens rotation) coincides with the geometric center FC of the target lens 800 by setting the frame center mode. This is a trajectory in which the target lens 800 is finished, and a predetermined finish in the radial direction with reference to the center FC with respect to the radial data (rn, θn) (n = 1, 2,..., N) of the target lens 800. A first locus 802 of the radius vector data (rn + Δd, θn) (n = 1, 2,..., N) increased by the machining allowance Δd is set. Further, in order to avoid interference of the coarse grindstone 162a with the cup 630 that protrudes from the target lens 800, the moving diameter data (Trn, θn) (n = 1, 2,..., N) of the cup outer diameter 630T is used. On the other hand, a second locus 804 of radius vector data (Trn + Δd, θn) (n = 1, 2,..., N) that is increased by a predetermined distance Δd in the radius direction with respect to the center FC is set. The roughing trajectory is the outermost synthetic trajectory obtained by synthesizing the first trajectory 802 and the second trajectory 804, but the portions 802a, 802b, 802c, and 802d where the first trajectory 802 and the second trajectory 804 intersect are roughened with a radius r162. If it tries to process with the grindstone 162a, it will interfere over the 1st locus | trajectory 802 and the 2nd locus | trajectory 804 of the circumference | surroundings. In order to avoid this, as shown in FIG. 7B, the radius vector data drawn so that the coarse whetstone 162 having the radius r162 is in contact with the outermost combined trajectory obtained by combining the first trajectory 802 and the second trajectory 804. A trajectory 810 of (Rrn, θn) (n = 1, 2,..., N) is calculated as roughing trajectory data.

  The control unit 50 controls the movement of the carriage 101 and the rotation of the lens LE based on the calculated roughing trajectory data, and roughens the lens periphery by the roughing grindstone 162a. During rough machining, a relatively large rotational moment load is applied to the lens periphery far from the center of the lens chuck due to the rotation of the lens and the rotational force of the coarse grindstone 162a, but the lens LE passes through the cup 630 having a large diameter. Since it is held by the chuck shafts 102L and 102R, the holding force is secured. For this reason, the axial deviation at the time of the roughing by the rough grindstone 162a is suppressed.

  When the roughing is finished, the control unit 50 temporarily stops the lens peripheral edge processing, and notifies the operator that the roughing is finished by the screen 500 and the sound generating means 55. When the operator depresses the switch of the switch unit 7, the lens chuck shaft 102R is opened, and the lens LE is released from the chucking state. Then, the operator takes out the lens LE to which the cup 630 is attached, and removes the supporter 650, the outer area 624 of the double-sided adhesive tape, and the outer area 629 of the patch seal from the cup 630 using a cup peeling jig (not shown). In this case, only the small diameter cup 640 is fixed to the lens LE.

  Further, the operator replaces the cup holder 600 attached to the lens chuck shaft 102L with the cup holder 700, and the lens holder 610 attached to the chuck shaft 102R to 710. Thereafter, the lens LE replaced with the small-diameter cup 640 is chucked by the lens chuck shafts 102L and 102R, and the start switch of the switch unit 7 is pressed to operate the apparatus.

  When the machining start signal is input again after the rough machining is completed, the control unit 50 operates the lens shape measurement units 300F and 300R, and based on the lens shape data (the lens shape 800 in FIG. 7A), Measure the front and back edge positions. In the flat machining mode, the target lens shape data is converted into finishing machining trajectory data. In the beveling mode, the bevel trajectory data formed on the lens LE based on the target lens shape data and the edge position information is calculated as the finishing processing trajectory. When chamfering is set, a chamfering locus is calculated based on edge position data on the front and rear surfaces of the lens.

  When the finishing machining locus is obtained, the control unit 50 performs the finishing processing of the lens periphery replaced with the small diameter cup 640 based on the finishing machining locus. There are two main methods for this processing. In the first method, as shown in FIG. 8, the remaining area 820 outside the locus 802 (the area obtained by subtracting the first locus 802 from the rough machining locus 810) that is larger than the target shape 800 by the finishing machining allowance Δd. In this method, after the roughing is performed with the roughing grindstone 162a, the remaining finishing allowance is processed with the finishing grindstone 162b. The control unit 50 controls the movement of the carriage 101 and the rotation of the lens LE based on the locus 802, and processes the remaining area 820 again with the rough grindstone 162a. At this time, a small-diameter cup 640 with a small mounting area is attached to the lens LE, but the remaining area 820 is sufficiently short from the cup center (lens rotation center) FC, and the rotational moment load applied to the lens during processing Therefore, the occurrence of axial misalignment can be suppressed even in the rough machining with the coarse grindstone 162a. When the processing of the region 820 is finished, the control unit 50 subsequently controls the movement of the carriage 101 and the rotation of the lens LE based on the finishing processing locus data obtained from the target lens shape data and the like, and the lens LE is used by the finishing grindstone 162b. Finish the periphery of the.

  The second processing method is a method in which the finishing grindstone 162b is completely processed including the remaining region 820. The control unit 50 controls the movement of the carriage 101 and the rotation of the lens LE based on the finishing process locus data, and finishes the periphery of the lens LE by the finishing grindstone 162b. At the time of finishing, by detecting the load current of the motor 160 for rotating the grinding wheel, in this case, the region 820 is excessively processed by the finishing stone 162b as compared with the first method, so that the rotational speed of the lens LE is large. As a result, the machining time becomes slightly longer. However, when the area 820 is not large, the total machining time and finishing time of the first method can be machined without a large difference.

  Note that the first method and the second method can be selectively used according to the amount of processing in the region 820. The processing amount of the region 820 can be roughly calculated based on the region obtained by subtracting the locus 802 from the locus 810 and the lens thickness obtained from the result of measuring the edge position of the front and rear surfaces of the lens.

  The calculation of the rough machining data is a preferable calculation method for reducing the remaining shape as much as possible by the first rough machining, but is not limited thereto. For example, as shown in FIG. 9A, the moving radius length Rbn (n = 1, 2,..., N) of the second locus 804 is determined from the cup mounting center position FC with respect to the target lens 800. A distance RA that is larger than the radial length Trn (n = 1, 2,..., N) of the outer diameter 630T, and that can prevent the occurrence of axial deviation in roughing or finishing when the small-diameter cup 640 is replaced. It suffices if it is set within the range. When using a small-diameter cup 640 having a short axis Sd642 of 15 mm or less (13.5 mm in the embodiment), if the distance RA is 25 mm or less, the rotational moment load applied to the lens LE during processing of the lens periphery is reduced and the shaft is displaced. Can be suppressed. Incidentally, although the distance RA has been described as 25 mm at the maximum, the distance RA may be increased when the allowable amount of the axis deviation may be increased. The second locus 804 may have an arbitrary shape such as an ellipse. In the example of FIG. 9A, the moving radius length Rbn of the second trajectory 804 is a distance equal to or less than the distance RA and larger than the maximum radius 15 mm of the large-diameter cup 630. The radial length Rbn in FIG. 9A is set at a constant distance of 16 mm around the center FC. As shown in FIG. 9B, the roughing locus 810 is a radial length drawn so that the rough grindstone 162 having a radius r162 is in contact with the outermost combined locus obtained by combining the first locus 802 and the second locus 804. It is calculated as a locus 810 of (Rrn, θn) (n = 1, 2,..., N).

  Moreover, although the example using the cup 630 of the double structure with the small diameter cup 640 and the supporter 650 was demonstrated above, it does not restrict to this. Initially, rough machining may be performed using the integrated cup 730 instead of the cup 630, and then the small-diameter cup 640 may be re-fixed by a shaft striker after the integrated cup 730 is removed from the lens LE. However, in this case, the fixing of the cup to the lens LE is performed twice, so that the accuracy of the mounting position is lowered and the labor of the operator is increased. On the other hand, if the cup 630 having a double structure as shown in FIG. 5 is used, the trouble of reblocking the small-diameter cup 640 by the shaft striker can be saved, and an installation position error can be generated due to reblocking. It is possible to control the lens periphery with high accuracy.

  In the present embodiment, the cup holder 600 and the lens holder 610 for the cup 630 are replaced with the cup holder 700 and the lens holder 710 for the small-diameter cup 640. An example of the change will be described with reference to FIG.

  When the cup 630 is used, the cup holder supporter 900 having a diameter corresponding to the cup 630 is mounted using the cup holder 700 for the small diameter cup 640 as a base. The supporter 900 has a cylindrical structure, and has an uneven portion 901 fitted into an uneven portion 703 a formed at the tip of the cup holder 700. Thereby, after the supporter 900 is mounted on the cup holder 700, the shift between the cup holder 700 and the supporter 900 can be reduced. And the uneven | corrugated | grooved part 656a of the collar part 656 which the cup 630 has is fitted by the uneven | corrugated | grooved part 903 formed in the front end side of the supporter 900. FIG. Accordingly, the supporter 900 attached to the cup holder 700 can perform the same function as the cup holder 600.

  Similarly, the lens presser 710 can be provided with a lens presser supporter 910 having substantially the same peripheral shape as that of the supporter 900, thereby achieving the same function as the lens presser 610.

  As described above, by using the cup holder supporter 900 and the lens presser supporter 910, the trouble of replacing the cup holders 600 and 700 and the lens pressers 610 and 710 is further reduced.

  As described above, the reduction of the axial deviation in the processing of the lens LE by the grindstone 162 as the processing tool has been described, but the application range of the cup changing processing mode is not limited to the above. For example, when an end mill is used as a processing tool (for example, Japanese Patent Application Laid-Open No. 2006-281367), the cup change processing mode can be applied because there is a concern about shaft misalignment.

It is a schematic block diagram of the process part of the processing apparatus concerning this invention. It is a schematic block diagram of a lens edge position measurement part. It is a control block diagram of a spectacle lens processing apparatus. It is a figure explaining the structure of a cup holder and a lens holder. It is a figure explaining composition, such as a small diameter cup and a supporter. It is a figure explaining an integrated large diameter cup. It is a figure explaining calculation of rough processing locus data. It is a figure explaining finishing processing. It is a figure explaining other examples of rough processing locus data calculation. It is a figure explaining the example of a change of a cup holder and a lens holder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Processing apparatus main body 50 Control part 100 Carriage part 102L, 102R Lens chuck shaft 162 Grinding wheel group 300F, 300R Lens edge position measurement part 630 Large diameter cup 640 Small diameter cup 650 Supporter 800 Shape 810 Rough processing locus

Claims (2)

A spectacle lens with a lens fixing cup attached is held by a lens chuck shaft, and the lens periphery is roughly processed with a roughing tool, and then the roughly processed lens periphery is based on the finish processing locus obtained from the target lens data. In a spectacle lens processing device that finishes with a finishing tool,
A processing mode setting means for setting a cup changing processing mode for processing the peripheral edge of the lens by changing the cup from a large diameter cup to a small diameter cup during the processing,
When the cup change machining mode is set, based on the first rough machining locus that is larger than the target shape data by a predetermined finishing machining allowance, and the first rough machining locus and the moving diameter of the large-diameter cup, A roughing trajectory data calculating means for calculating a second roughing trajectory having a larger radius than the radius of the large-diameter cup;
This is a processing control means for interrupting the processing operation once after the peripheral processing of the lens to which the large-diameter cup is attached based on the second rough processing trajectory by the processing start signal, and then temporarily stopping the processing. When the processing resumption signal is input, the peripheral edge of the lens replaced with the small-diameter cup is roughly processed based on the first rough processing locus and then finished based on the finishing processing locus, or directly finished. An eyeglass lens processing apparatus comprising: a processing control means for performing finishing processing with a tool based on a finishing processing locus or performing any processing control. The eyeglass lens processing apparatus according to claim 1, wherein the rough machining trajectory data calculation means obtains a composite trajectory obtained by combining the first rough machining trajectory and a trajectory obtained by adding a predetermined distance Δd to the radius of the large-diameter cup, A portion where the first roughing trajectory and the trajectory obtained by adding the predetermined distance Δd to the moving diameter of the large-diameter cup are further corrected so as to avoid processing interference due to the diameter of the roughing tool, and the second roughing trajectory. The eyeglass lens processing apparatus is characterized in that the predetermined distance Δd is set as a distance that avoids processing interference between the rough processing tool and the large-diameter cup during rough processing.