JP2005074560A - Spectacle lens working device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a lens rim formed around a periphery of a lens from thinning without depending on a lens rim curve. <P>SOLUTION: A spectacle lens working device includes: a lens rotating means having a lens rotation axis for holding the spectacle lens; a first whetstone rotating means having a first whetstone rotation axis on which a first rim finishing whetstone is provided for forming the lens rim around the spectacle lens; a second whetstone rotating means having a second whetstone rotation axis on which a second rim finishing whetstone is provided with a diameter smaller than that of the first rim finishing whetstone for forming the rim along the periphery of the lens; and a selection means for selecting either the first or the second whetstone rotating means to be used in working on the lens rim. The second whetstone rotating axis is a rotation axis inclined with respect to the axial direction of a lens rotation axis, and the second rim finishing whetstone is a conic whetstone with a V-groove formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

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

In a spectacle lens processing apparatus that processes the peripheral edge of a spectacle lens in order to enclose the spectacle lens in the spectacle frame, generally, processing is performed to form a bevel around the lens periphery with a bevel grindstone having a V-shaped bevel groove. (For example, refer to Patent Document 1). In general, the bevel grindstone is a cylindrical one having a diameter of 100 mm or more in consideration of consumability, like the rough grindstone.
Japanese Patent Laid-Open No. 11-70451

  In recent years, many eyeglass frames have a tight frame curve (the curvature of the curve is small) due to diversification of design. In this case, it is necessary to form the bevel curve according to the frame curve. However, with a cylindrical bevel grindstone having a diameter of about 100 mm, when the bevel curve is tight, the bevel grindstone interferes with the formed bevel, and the bevel becomes thin (the width and height of the bevel are reduced). There was a problem.

  The present invention has been made in view of the above-described problems of the conventional apparatus, and an object of the present invention is to provide a spectacle lens processing apparatus capable of suppressing the thinning of the bevel formed on the periphery of the lens without depending on the bevel curve.

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

(1) In a spectacle lens processing apparatus for processing a peripheral edge of a spectacle lens, a lens rotating means having a lens rotation axis for holding the spectacle lens and a first bevel finishing grindstone for forming a bevel on the peripheral edge of the spectacle lens are arranged. A first grindstone rotating means having a first grindstone rotating shaft, and a second grindstone rotating shaft in which a second bevel finishing grindstone having a diameter smaller than that of the first bevel finishing grindstone is arranged to form a bevel on the periphery of the spectacle lens. And a selection means for selecting which of the first grindstone rotation means and the second grindstone rotation means is to be used at the time of beveling.
(2) In the spectacle lens processing apparatus according to (1), the spectacle lens processing apparatus includes setting means for setting bevel shape data to be formed on the periphery of the spectacle lens, and the selection means rotates the first grindstone based on the set bevel shape data. It is a means to determine which of a means or a 2nd grindstone rotating means is used.
(3) In the spectacle lens processing apparatus according to (1), the second grindstone rotating shaft is a rotating shaft inclined with respect to the axial direction of the lens rotating shaft, and the second bevel finishing grindstone is formed with a bevel groove. It is a cone-shaped grindstone.
(4) In the eyeglass lens processing apparatus according to (1), the first grindstone rotating shaft, the second grindstone rotating shaft, and the lens rotating shaft are arranged on the same plane, and the first grindstone rotating shaft and the second grindstone rotating A lens rotating shaft is disposed between the shaft and a moving means for moving the lens rotating shaft in a direction in which an inter-axis distance varies with respect to each of the first grindstone rotating shaft and the second grindstone rotating shaft. It is characterized by.
(5) In the spectacle lens processing apparatus according to (1), a rough grindstone for roughing is coaxially disposed on the first grindstone rotating shaft, and a chamfering grindstone, a grooving grindstone, and a hole are disposed on the second grindstone rotating shaft. At least one of the opening tools is arranged coaxially.

  According to the present invention, even for a bevel curve having a tight curve from a curve close to a flat shape, it is possible to perform processing while suppressing the bevel thinness regardless of the bevel curve.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is an external configuration diagram of a spectacle lens processing apparatus according to the present invention. Reference numeral 1 denotes an apparatus main body, and a spectacle frame shape measuring apparatus 2 is connected to the apparatus main body 1. The apparatus body 1 is provided with a display 415 for displaying processing information and an operation panel unit 420 having various switches. Reference numeral 402 denotes an opening / closing window for a processing chamber.

  2 to 3 are diagrams for explaining a processing mechanism of the apparatus main body 1. 2 is a view of the processing mechanism as viewed from above, and FIG. 3 is a view of the processing mechanism as viewed from the right side. The apparatus body 1 is provided with a lens shape measuring mechanism, which can be a well-known one (for example, those described in JP-A-5-212661 and JP-A-2003-145400). The description is omitted.

  On the base 10, a carriage unit 100, a first grindstone rotation mechanism unit 200, and a second grindstone rotation mechanism unit 250 are arranged. The raw spectacle lens LE is sandwiched between the two lens rotation shafts 110L and 110R of the carriage unit 100, and the peripheral edges thereof are arranged by the grindstones respectively disposed on the first grindstone rotation mechanism unit 200 and the second grindstone rotation mechanism unit 250. Is ground.

  <First Grinding Wheel Rotating Mechanism Unit> The first grindstone rotating mechanism unit 200 is disposed on the front side of the carriage unit 100, and includes a rough grindstone 201a for glass, a rough grindstone 201b for plastic, a V-shaped bevel groove, and the like. A large-diameter bevel finishing grindstone 201c having a machining surface for flat machining is provided. The grindstones 201a, 201b, and 201c are arranged coaxially with the grindstone rotating shaft 203. Further, the grindstones of the grindstones 201a, 201b, and 201c have a cylindrical shape, and each has a diameter of about 100 mm in order to increase the life against wear. The bevel finishing grindstone 201c is used for processing when the bevel curve is relatively loose (curve value Crv = less than 6). The grindstone rotating shaft 203 is rotatably supported by a spindle unit 205 fixed on the base 10, and a motor 207 for rotating the grindstone rotating shaft 203 is connected to an end portion of the grindstone rotating shaft 203.

  <Carriage Unit> The carriage unit 100 includes a carriage base 101 that can move along two shafts 107 that extend in a direction parallel to the grindstone rotation shaft 203 (hereinafter referred to as the X-axis direction). A rack 103 extending in the X-axis direction is attached to the rear of the carriage base 101. A pinion attached to the rotation shaft of the X-axis pulse motor 105 is connected to the rack 103, and the movement of the carriage base 101 in the X-axis direction is controlled by the rotation of the motor 105.

  A substantially U-shaped carriage 112 is mounted on the carriage base 101. FIG. 4 is a view of the carriage 112 as viewed from the front. A left arm 112L and a right arm 112R extending upward are formed on the carriage 112. The lens rotation shaft 110L is rotatably held on the left arm 112L, and the lens rotation shaft 110R is rotatably held on the right arm 112R. The lens rotation axes 110 </ b> L and 110 </ b> R are in a positional relationship parallel to the grindstone rotation axis 203.

  The lens rotation shaft 110R is movable in the axial direction by a mechanism such as a feed screw provided inside the motor 115 and the right arm 112R. Thereby, the lens LE is clamped by the lens rotation shafts 110L and 110R. On the other hand, a shaft 120 extending in the X-axis direction is connected to a rotation shaft of a motor 117 attached to the right side of the carriage 112. The shaft 120 is connected to the lens rotation shaft 110 </ b> L via the belt 121 and is also connected to the lens rotation shaft 110 </ b> R via the belt 122 at the same time. For this reason, the lens rotation shafts 110L and 110R are simultaneously rotated by the rotation of the motor 117.

  Two carriage bases 101 are parallel to a direction (hereinafter referred to as a Y-axis direction) in which an inter-axis distance between the grindstone rotating shaft 203 of the first grindstone rotating mechanism unit 200 and the lens rotating shaft (110L, 110R) varies. The rail 131 is provided. Note that the Y-axis of the apparatus in the present embodiment is a direction inclined about 15 degrees toward the front side with respect to the horizontal plane, and the upper surface of the carriage base 101 is similarly inclined toward the front side. The carriage 112 is provided so as to be movable in the Y-axis direction along the two rails 131. A Y-axis moving motor 135 is fixed behind the carriage base 101. A feed screw 133 is connected to the rotating shaft of the motor 135. The feed screw 133 also extends in the Y axis, and the carriage 112 is controlled to move in the Y axis direction by the feed screw 133 rotated by the motor 135. As the motor 135, a servo motor including an encoder 136 for detecting rotation is adopted. During processing, the rotational torque (motor load current) of the motor 135 is detected, and the processing pressure of the lens LE for each grindstone is controlled by controlling the power applied to the motor 135. Further, the movement position information of the carriage 112 is detected by a signal output from the encoder 136, and the end of processing is determined.

  <Second Grinding Wheel Rotating Mechanism Unit> The second grindstone rotating mechanism unit 250 is fixed to the base 10 by the mounting member 201 so as to be positioned on the back side of the carriage unit 100. FIG. 5 is a diagram illustrating the configuration of the second grindstone rotating mechanism unit 250. The second grindstone rotating mechanism 250 is attached to the motor 253, the rotary shaft 255 connected to the motor 253, an L-shaped support base 257 that rotatably supports the grindstone rotating shaft 260, and the grindstone rotating shaft 260. A grindstone 270 and a drill 280 are provided. The rotation of the rotating shaft 255 is transmitted to the grindstone rotating shaft 260 via the bevel gears 258 and 261.

  Here, the grindstone rotating shaft 260, the lens rotating shafts 110L and 110R, and the grindstone rotating shaft 203 of the first grindstone rotating mechanism unit 200 are arranged on the same plane 01 (see FIG. 3). . The grindstone rotating shaft 260 is inclined with respect to the axial direction of the lens rotating shafts 110L and 110R on the same plane 01. The inclination angle α1 is preferably 5 to 15 degrees, and is set to about 10 degrees in the present embodiment.

  The grindstone portion 270 includes a conical small-diameter bevel finishing grindstone 271 having a V-shaped bevel groove, a chamfering grindstone 272 for the front surface of the lens, a chamfering grindstone 273 for the rear surface of the lens, and a grooving grindstone 274. . The small-diameter bevel finishing grindstone 271 has a smaller diameter than the bevel finishing grindstone 201c of the first grindstone rotating mechanism 200, and the diameter is preferably less than half that of the beveling finishing grindstone 201c. By making the diameter less than half that of the bevel finishing grindstone 201c, it is possible to suppress the bevel thinning even in a high curve bevel having a curve value of 6 or more. In the present embodiment, the diameter of the small-diameter bevel finishing grindstone 271 (the diameter of the minimum diameter portion of the bevel groove) is 30 mm. The angle of the conical surface of the bevel finishing grindstone 271 (the angle with respect to the axis of the grindstone rotating shaft 260) is the same as the inclination angle α of the grindstone rotating shaft 260. Therefore, the conical surface is parallel to the axial direction of the lens rotation shafts 110L and 110R. The outer diameters of the chamfering grindstone 272 and the chamfering grindstone 273 are set so as to be positioned on the extension of the conical surface of the bevel finishing grindstone 271. The outer diameter of the grooving grindstone 274 is slightly smaller than the extension line of the conical surface of the bevel finishing grindstone 271. The drill 280 is attached to the end of the drill 280 so as to be coaxial with the grindstone rotating shaft 260.

  It should be noted that the grindstone rotating shaft 260 may remain parallel to the axial direction of the lens rotating shafts 110L and 110R without being inclined, but in order to suppress the bevel fading even in a higher beveled curve, the grindstone rotating shaft 260 Is preferably inclined.

  The carriage 112 is movable in the Y-axis direction so as to press the lens LE held between the lens rotation shafts 110L and 110R against the grindstone portion 270, and the lens rotation shafts 110L and 110R and the grindstone rotation shaft are controlled by the motor 135. The distance between the shafts 203 is adjusted.

  FIG. 6 is a perspective view for explaining a measurement mechanism of the spectacle frame shape measuring apparatus 2. The shape measuring unit 2 a includes a movable base 21 that is movable in the horizontal direction, a rotating base 22 that is rotated by a pulse motor 30 attached to the movable base 21, and holding plates 35 a and 35 b that are suspended from the rotating base 22. The movable block 37 that can move on the two rails 36a and 36b supported by the holding plates 35a and 35b, the measuring element shaft 23 that is inserted into the movable block 37 and can be rotated and moved up and down, and measurement A probe 24 is attached to the upper end of the slave shaft 23, the tip of which is on the axis on the probe shaft 23, and a pin 42 that is rotatably attached to the lower end of the probe shaft 23 and extends vertically from the moving block 37. And a light shielding plate 25 having a vertical slit 26 and a slit 27 having an inclination angle of 45 degrees formed on the tip of the arm 41. A pair of light emitting diodes 28 and a linear image sensor 29 attached to the rotary base 22 so as to sandwich the light shielding plate 25, and a drum 44 rotatably supported on the rotary base 22 are mounted, and the moving block 37 is always measured. A constant torque spring 43 that pulls toward the distal end side of the child 24.

  With the shape measuring unit 2a having such a configuration, the shape of the spectacle frame is measured as follows. First, the spectacle frame is fixed to a spectacle holding unit (not shown) (see Japanese Patent Laid-Open No. 5-212661), and the tip of the measuring element 24 is brought into contact with the inner groove of the spectacle frame. Subsequently, the pulse motor 30 is rotated every predetermined number of unit rotation pulses. At this time, the measuring element shaft 23 integrated with the measuring element 24 moves on the rails 36a and 36b according to the radius of the spectacle frame and moves up and down according to the curve of the spectacle frame. According to these movements, the light shielding plate 25 moves vertically and horizontally between the light emitting diode 28 and the linear image sensor 29 to shield light from the light emitting diode 28. The light that has passed through the slits 26 and 27 formed in the light shielding plate 25 reaches the light receiving portion of the linear image sensor 29, and the amount of movement is read. For the movement amount, the position of the slit 26 is read as the moving radius r, and the difference between the positions of the slit 26 and the slit 27 is read as the height information z of the spectacle frame. By measuring N points in this way, the spectacle frame shape is measured as (rn, θn, zn) (n = 1, 2,..., N) (for details, refer to Japanese Patent Laid-Open No. 4-105864). .

  The operation of the apparatus having the above configuration will be described using the control system block diagram of FIG. First, the shape of the spectacle frame is measured by the spectacle frame shape measuring apparatus 2. Frame shape data (rn, θn, zn) obtained by the spectacle frame shape measuring apparatus 2 is input to the data memory 451 by pressing the switch 421 of the operation panel unit 420. The display 415 displays a target figure based on the frame shape data, and is in a state where processing conditions can be set or input. The operator inputs layout data such as the wearer's PD value, FPD value, optical center height, and other processing conditions such as the material of the lens to be processed, the material of the frame, and the processing mode, using the switch on the operation panel unit 420. . Here, it is assumed that the frame curve is processed in accordance with a spectacle frame having a high curve, and the processing mode is set to the bevel forced mode by the mode switch 422. A lens LE corresponding to a high curve is selected in advance. When the processing conditions can be input, the unprocessed lens LE is chucked by the lens rotation shafts 110L and 110R, and the start switch 423 is pressed to operate the apparatus.

  The controller 450 operates the lens shape measuring mechanism 500 in response to the start signal, and measures the edge position of the lens corresponding to the frame shape data and the layout data. Thereafter, the control unit 450 performs a bevel calculation for obtaining the bevel apex locus data formed on the lens LE based on the edge position information in accordance with a predetermined program. The bevel apex trajectory data is one method for expressing the bevel shape data. In the bevel calculation at this stage, for example, the bevel apex is arranged on the entire radius of the circumference so as to divide the edge thickness at a predetermined ratio (for example, 3: 7 from the lens front side).

  When the bevel calculation is completed, as shown in FIG. 7, the display screen of the display 415 is switched to a simulation screen in which the bevel shape can be changed. In the “curve” item 301 on the initial screen, an approximate curve value (bevel curve) obtained from the bevel apex trajectory data obtained by the above-described bevel calculation is displayed. In the “FC” item 302, an approximate curve value (frame curve) of the spectacle frame measured by the spectacle frame shape measuring unit 2 is displayed. The “position” item 303 is an item for inputting an offset amount for translating the bevel apex locus to the front side or the rear side of the lens. The “TILT” item 304 is an item for inputting data for tilting the bevel apex locus.

  The curve value of the item 301 is obtained as follows, for example. From arbitrary four points of the bevel apex locus data by the bevel calculation, it is assumed that these four points are on a spherical surface having the same center (a, b, c) and radius r. The sphere equation is

であるので、この式に任意の４点のヤゲン頂点位置データを代入することにより、その４点を通る中心（ａ，ｂ，ｃ）及び半径ｒがそれぞれ求められる。これを数組（４から５組）行い、その平均を算出する。これにより得られる球の半径ｒからカーブ値Ｃrvが決定される。カ−ブ値Ｃrvは、慣例的に眼鏡レンズにおけるレンズカーブを表現する値であり、下記の式により求められる。

Therefore, by substituting arbitrary four bevel apex position data into this equation, the center (a, b, c) and radius r passing through the four points can be obtained. This is done in several sets (4 to 5 sets), and the average is calculated. The curve value Crv is determined from the radius r of the sphere thus obtained. The curve value Crv is a value that conventionally represents a lens curve in a spectacle lens, and is obtained by the following equation.

この式において、ｎはレンズの屈折率であり、一般に1.523 が与えられる。また、「ＦＣ」項目３０２の眼鏡枠のカーブ値（フレームカーブ）も同様な方法により求められる。

In this equation, n is the refractive index of the lens and is generally given as 1.523. Also, the curve value (frame curve) of the eyeglass frame of the “FC” item 302 is obtained by the same method.

  Here, if the difference between the bevel curve and the frame curve is too large, the frame may not be able to be inserted. In this case, the curve value displayed in the “FC” item 302 is referred to follow the frame curve. The adjustment is performed as follows: The cursor 300 of the reverse display displayed by pressing the two movement switches 425 is set to the item 301 and changed to the desired curve value by the switches 430a and 430b. When the bevel position is to be moved in parallel, the highlighted cursor 300 is moved to the item 303 and the offset amount is input, and the control unit 450 sets the bevel apex at the minimum edge thickness position based on the changed input data. Find the center point coordinate of the sphere to ride, and from this center point coordinate and the radius of the bevel curve obtained from the curve value To recalculate the current vertex position.

  In the simulation screen, the target lens shape 310 based on the frame shape data, the mark 311 indicating the minimum edge thickness position, the mark 312 indicating the maximum edge thickness position, and the radius for displaying the bevel state on the bevel cross-section display unit 320 are displayed. A rotation cursor 313 for designating a position is displayed, and the operator can check the bevel state planned after processing over the entire circumference by changing the position of the rotation cursor 313 with a switch on the operation panel 420.

  Further, the operator selects a bevel finishing grindstone to be used in the beveling by the switch 427 depending on whether or not the bevel curve set in the “curve” item 301 is a high curve. For example, when the bevel curve value Crv is 6 or more, the small-diameter bevel finishing grindstone 271 is selected. When the bevel curve value Crv is less than 6, the large-diameter bevel finishing grindstone 201c is selected. The selection information is shown in the display item 330 on the screen of the display 415. “Small” is displayed when the small-diameter bevel finishing grindstone 271 is selected, and “Big” is displayed when the large-diameter beveling finishing grindstone 201c is selected.

  The control unit 450 obtains processing information for bevel finishing according to the selection of the bevel finishing grindstone. The processing information calculation will be described. First, in the case of the cylindrical large-diameter bevel finishing grindstone 201c, the following is obtained. The radius information of the bevel apex locus is assumed to be (En, θn) (n = 1, 2,..., N). En is the radial length (radius), and θn is the radial angle. The radius of the bevel groove of the large-diameter bevel finishing grindstone 201c is Rb. At this time, the center-to-center distance between the rotation center of the bevel grindstone 201c and the processing center of the lens LE (distance between the grindstone rotation axis and the lens rotation axis) Lb is obtained by the following equation.

ここで、動径情報（Ｅn ，θn ）を微小な任意の単位角度だけ加工中心を中心に回転させ、その時のＬｂの最大値を求める。この回転角をξi （ｉ ＝１，２，３，…，Ｎ）とし、全周に亘ってこの計算を行うことにより、それぞれのξi におけるＬｂの最大値をＬｂi 、その時のθn をΘi とし、軸間距離方向（Ｙ方向）の加工情報を（ξi ，Ｌｂi ，Θi ）（ｉ ＝１，２，３，…，Ｎ）として得る。

Here, the radius vector information (En, θn) is rotated about the machining center by a minute arbitrary unit angle, and the maximum value of Lb at that time is obtained. By making this rotation angle ξi (i = 1, 2, 3,..., N) and performing this calculation over the entire circumference, the maximum value of Lb in each ξi is Lbi, and θn at that time is Θi, Machining information in the interaxial distance direction (Y direction) is obtained as (ξi, Lbi, Θi) (i = 1, 2, 3,..., N).

  In the case of the small-diameter bevel finishing grindstone 271, the grindstone rotation shaft 260 and the lens rotation shafts 110L and 110R are not parallel (inclination angle α). Therefore, when the grindstone shape is viewed from the axial direction of the lens rotation shaft, as shown in FIG. It becomes a round shape. When the radius of the bevel groove of the small-diameter bevel finishing grindstone 271 is Rs, the center distance Ls between the center of the bevel groove of the grindstone 271 and the processing center of the lens LE can be obtained by the following equation.

前述と同様に、動径情報（Ｅn ，θn ）を微小な任意の単位角度だけ加工中心を中心に回転させ、その時のＬsの最大値を求める。この回転角をξi （ｉ ＝１，２，３，…，Ｎ）とし、全周に亘ってこの計算を行うことにより、それぞれのξi におけるＬｓの最大値をＬｓi 、その時のθn をΘi とし、軸間距離方向（Ｙ方向）の加工情報を（ξi ，Ｌｓi ，Θi ）（ｉ ＝１，２，３，…，Ｎ）として得る。

As described above, the radius vector information (En, θn) is rotated about the machining center by a minute arbitrary unit angle, and the maximum value of Ls at that time is obtained. By making this rotation angle ξi (i = 1, 2, 3,..., N) and performing this calculation over the entire circumference, the maximum value of Ls in each ξi is Lsi, and θn at that time is Θi, Machining information in the axial distance direction (Y direction) is obtained as (ξi, Lsi, Θi) (i = 1, 2, 3,..., N).

  Further, since the grindstone rotating shaft 260 is inclined, when the grindstone shape is viewed from the lens LE side, it becomes a round shape as shown in FIG. For this reason, when the small-diameter bevel finishing grindstone 271 is used, it is necessary to correct the lens rotation axis direction (X-axis direction). The deviation amount Xs in the X-axis direction is obtained by the following equation.

前述と同様に、動径情報（Ｅn ，θn ）を微小な任意の単位角度だけ加工中心を中心に回転させ、その時のＸｓの最大値を求めることにより、Ｘ軸方向の補正情報（ξi ，Ｘｓi ，Θi ）（ｉ ＝１，２，３，…，Ｎ）として得る。

As described above, the radius vector information (En, θn) is rotated about the machining center by a minute arbitrary unit angle, and the Xs correction value (ξi, Xsi) is obtained by obtaining the maximum value of Xs at that time. , Θi) (i = 1, 2, 3,..., N).

  After confirming the bevel state with the bevel display section 320, if there is no problem, the start switch 423 is pressed to start machining. The control unit 450 executes processing by controlling the operation of the carriage unit 100 according to the processing sequence. When the material of the lens LE is plastic, first, the carriage base 101 is moved in the X-axis direction by driving the motor 105 so that the chucked lens LE is positioned on the rough grindstone 201b. Thereafter, the motor 135 is driven and controlled based on the processing information for rough processing, and the carriage 112 is moved in the Y-axis direction to execute rough processing of the periphery of the lens LE.

  When roughing is finished, the process proceeds to bevel finishing. When the small-diameter bevel finishing grindstone 271 for high curve is selected, after the rotation of the motor 207 of the first grindstone rotating mechanism unit 200 is stopped, the motor 253 of the second grindstone rotating mechanism unit 250 is rotated. Then, the carriage base 101 is moved in the X-axis direction so that the lens LE is positioned on the bevel groove of the finishing grindstone 271. Thereafter, the carriage 112 is moved in the Y-axis direction based on the processing information (ξi, Lsi, Θi) in the Y direction, and the carriage is moved based on the bevel apex data and the correction information (ξi, Xsi, Θi) in the X-axis direction. 112 is controlled to move in the X-axis direction, and beveling is performed by pressing the periphery of the lens LE against the small-diameter bevel finishing grindstone 271 while rotating the lens LE. By using the conical small-diameter bevel finishing grindstone 271 in this way, even if the bevel curve is a high curve, it is possible to perform processing while suppressing the bevel thinness.

  When processing the lens LE, the control unit 450 controls the processing pressure of the lens LE with respect to the grindstone by detecting the rotational torque of the motor 135, and determines the movement position of the carriage 112 in the Y-axis direction based on a signal output from the encoder 136. Control and determine the end of processing.

  When the large-diameter bevel finishing grindstone 201c for low curve is selected, the lens LE is positioned on the bevel groove of the finishing grindstone 271 following the end of the rough machining, and machining information (ξi, Lsi, The carriage 112 is controlled to move in the Y-axis direction based on Θi), and the carriage 112 is controlled to move in the X-axis direction based on the bevel apex data, and the edge of the lens LE is pressed against the bevel finishing grindstone 201c to bevel. I do. If only the conical small-diameter bevel finishing grindstone 271 is used to cope with all beveling processing, conversely, when the bevel curve is loose, the bevel becomes thin due to interference. For this reason, when a bevel curve is loose, the process which suppressed the bevel thinning can be performed by using the cylindrical large diameter bevel finishing grindstone 201c.

  In the above description, the bevel finishing grindstone used in the beveling process is selected by the operator using the switch 427. However, this is a set or input bevel curve value (this is one method for expressing the bevel shape data). The control unit 450 may determine based on the above. That is, similarly to the above example, when the bevel curve value Crv = 6 is less than the large-diameter bevel finishing grindstone 201c, and when the curve value Crv = 6 or more, the small-diameter bevel finishing grindstone 271 is used. In the control automatically determined by the control unit 450 based on the bevel curve value, one curve value is equal to or greater than the curve value Crv = 6 in the processing of the right eye lens and the processing of the left eye lens. When the curve value Crv is less than 6, it may be determined so as to align with the bevel finish grindstone used for the first processing.

  Further, in this apparatus, since the chamfering grindstones 272, 273, the grooving grindstone 274, and the drilling drill 280 are provided on the grindstone rotating shaft 260 of the second grindstone rotating mechanism section 250, the surface of the corner portion of the lens LE is provided. It can also handle machining, peripheral grooving and drilling.

  When chamfering is selected by a switch on the operation panel 420, the control unit 450 controls the movement of the carriage 112 in the X-axis direction and the Y-axis direction based on the separately obtained chamfering data. The chamfering of the front surface of the lens is controlled so that the front edge of the lens LE is applied to the chamfering grindstone 272, and the chamfering of the rear surface of the lens is controlled so that the rear surface edge of the lens LE is applied to the chamfering grindstone 273.

  When the machining mode is set to the grooving mode, the control unit 450 controls the movement of the carriage 112 in the X-axis direction and the Y-axis direction based on the separately obtained grooving data after completion of the roughing and flat finishing. Then, the peripheral edge of the lens LE is pressed by the grooving grindstone 274 to perform grooving. Grooving data can be obtained basically in the same manner as the machining information of the small-diameter bevel finishing grindstone 271.

  When the machining mode is set to the drilling mode, the drilling position data is input using the switch on the operation panel 420. The hole position data is given by, for example, a moving radius length and a moving radius angle at the lens rotation center. The controller 450 converts the drilling position data into data of the X direction, the Y direction, and the lens rotation angle, and positions the tip of the drill 280 at the hole position on the front surface of the lens. Thereafter, drilling is performed to control the movement of the carriage 112 in the X and Y directions so that the lens LE moves to the inclination angle α of the grindstone rotating shaft 260.

  The second grindstone rotating mechanism unit 250 described in the above embodiment has been described as being disposed in the opposite direction from the first grindstone rotating mechanism unit 200 around the lens rotation shafts 110L and 110R. Configuration is also possible. That is, the second grindstone rotating mechanism 250 is positioned at the retracted position when using the first grindstone rotating mechanism 200, and moves between the lens rotation shafts 110L and 110R and the first grindstone rotating mechanism 200 when used. It is also good.

  Further, by providing a third bevel finishing grindstone having an intermediate diameter between the small-diameter bevel finishing grindstone 271 and the large-diameter beveling finishing grindstone 201c, it is possible to further reduce the beveling of the intermediate bevel curve having a curve value of 4-6. It becomes possible to suppress. In this case, in contrast to the configuration shown in FIGS. 2 and 3, the grindstone rotating mechanism having the third bevel finishing grindstone may be configured to move from the retracted position to the used position during use.

It is an external appearance block diagram of the spectacle lens processing apparatus which concerns on this invention. It is the figure which looked at the processing mechanism of the apparatus main body from the top. It is the figure which looked at the processing mechanism of the apparatus main body from the right side. It is the figure which looked at the carriage from the front. It is a figure explaining the structure of a 2nd grindstone rotation mechanism part. It is a perspective view explaining the measurement mechanism which a spectacles frame shape measuring device has. It is a control system block diagram of the spectacle lens processing apparatus which concerns on this invention. It is a figure explaining the method of calculating | requiring the process information of a small diameter bevel finishing grindstone.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Eyeglass frame shape measuring apparatus 100 Carriage part 110L, 110R Lens rotating shaft 112 Carriage 135 Motor 200 1st grindstone rotating mechanism part 201a, 201b Coarse whetstone 201c Large diameter bevel finishing whetstone 203 Whetstone rotating shaft 207 Motor 250 2nd whetstone Rotation mechanism part 260 Grinding wheel rotating shaft 270 Grinding wheel part 271 Small diameter bevel finishing grindstone 272, 273 Chamfering grindstone 274 Grooving grindstone 280 Drilling drill 415 Display 420 Operation panel part 450 Control part

Claims (5)

In a spectacle lens processing apparatus for processing a peripheral edge of a spectacle lens, a lens rotating means having a lens rotation axis for holding a spectacle lens and a first bevel finishing grindstone for forming a bevel on the peripheral edge of the spectacle lens are arranged. A first grindstone rotating means having a grindstone rotating shaft, and a second grindstone rotating shaft in which a second bevel finishing grindstone having a diameter smaller than that of the first bevel finishing grindstone is arranged to form a bevel at the periphery of the spectacle lens. An eyeglass lens processing apparatus comprising: a grindstone rotating means; and a selecting means for selecting which of the first grindstone rotating means and the second grindstone rotating means to use at the time of beveling. 2. The spectacle lens processing apparatus according to claim 1, further comprising setting means for setting bevel shape data to be formed on a peripheral edge of the spectacle lens, wherein the selecting means is based on the set bevel shape data and the first grindstone rotating means or An eyeglass lens processing apparatus, which is a means for determining which of the two grindstone rotating means is used. 2. The eyeglass lens processing apparatus according to claim 1, wherein the second grindstone rotating shaft is a rotating shaft inclined with respect to the axial direction of the lens rotating shaft, and the second bevel finishing grindstone has a conical shape in which a bevel groove is formed. A spectacle lens processing apparatus, which is a grindstone. The eyeglass lens processing apparatus according to claim 1, wherein the first grindstone rotating shaft, the second grindstone rotating shaft, and the lens rotating shaft are arranged on the same plane, and the first grindstone rotating shaft and the second grindstone rotating shaft A lens rotating shaft is disposed between the first rotating shaft and the second rotating wheel rotating shaft. The moving shaft moves the lens rotating shaft in a direction in which the inter-axis distance varies. Eyeglass lens processing device. 2. The eyeglass lens processing apparatus according to claim 1, wherein a rough grindstone for roughing is coaxially disposed on the first grindstone rotating shaft, and a chamfering grindstone, a grooving grindstone, and a drilling tool are disposed on the second grindstone rotating shaft. An eyeglass lens processing apparatus, wherein at least one is arranged coaxially.

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