JP2007301695A - Method and device for chamfering of spectacle lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for chamfering of a spectacle lens capable of carrying out a desired chamfering machining even it is any kind of spectacle lens. <P>SOLUTION: A chamfering tool 26 and a gauge head 28 are mounted on a Z-axis plate 65. A first chamfering locus data which shows a machining locus of the chamfering tool 26 during machining edge parts 18A, 18B with the chamfering tool 26 is calculated by a first chamfering data calculation means 5 based on the position data of the edge part having a spectacle frame shape calculated in machining the peripheral surface of the spectacle lens L. An edge part measuring means 29 measures a deviation amount ΔZ from the first chamfering locus data of the edge parts 18A, 18B with the gauge head 28. A second chamfering locus data calculation means 7 calculates the second chamfering locus data by correcting the first chamfering locus data using the deviation amount ΔZ. The chamfering tool 26 chamfers the edge parts 18A, 18B based on the second chamfering locus data. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a chamfering method and a chamfering apparatus for chamfering an edge portion of a spectacle lens, and further relates to a spectacle lens having a chamfering process applied to the edge portion by these method and apparatus.

  2. Description of the Related Art Conventionally, chamfering methods and chamfering apparatuses that chamfer an edge portion where a peripheral surface and a lens surface adjacent to the peripheral surface intersect have been proposed as devices used for manufacturing spectacle lenses. For example, in the lens chamfering method and the lens processing apparatus described in Japanese Patent Application Laid-Open No. 2001-87922, it is proposed to use a ball end mill as a grinding tool for chamfering the edge portion of the lens peripheral surface. In addition, the lens processing method and the lens processing apparatus described in the cited document 1 measure the rough processed lens immediately before the finishing process in the method of grinding the lens peripheral surface into the lens shape of the spectacle frame. A method has been proposed in which shape information of a finished lens is obtained, finished processing is performed on the basis of the measurement result to obtain a finished lens, and subsequently, grooving and chamfering are performed as necessary.

  In the chamfering operation of the edge portion of the spectacle lens, for example, a desired chamfering amount (width) in a range of 0.2 mm to 1.0 mm is appropriately selected, and it is required to perform chamfering uniformly on the entire circumference of the lens. The For this reason, for example, in the lens processing method and the lens processing apparatus described in the cited document 1, first, a finished lens before chamfering processed by a pair of lens holding shafts is processed with its convex lens surface and concave side. Insert and fix from both sides of the lens surface. Thereafter, the lens is rotated with the lens holding shaft, and a chamfering process is performed by pressing a grinding tool (chamfering tool) such as a diamond wheel against the edge of the peripheral surface. The chamfering trajectory data of the machining tool used as control data for this machining tool calculates the position data of the edge part on the peripheral surface of the lens after the peripheral surface finishing processing by measuring the rough processed lens before the peripheral surface finishing processing. , Calculated based on the position data of the edge portion.

JP 2003-300138 A

  However, in the lens processing method and the lens processing apparatus described in the cited document 1, the position of the edge portion on the peripheral surface of the lens after measuring the rough processed lens before the peripheral surface finishing process is measured. Since the data is calculated and the chamfering is performed based on the position data of the edge portion, there is a problem that the chamfering accuracy is low. That is, the position data of the edge part on the peripheral surface of the lens before the peripheral surface finishing process and the position of the edge part on the peripheral surface of the lens after the peripheral surface is actually finished are the processes for processing the peripheral surface. There may be differences due to changes in the lens surface shape due to tool wear or peripheral surface processing, shakiness of the operating mechanism, and the like. For this reason, when chamfering is performed with a machining tool using the chamfering trajectory data before the peripheral surface processing as control data, the chamfering amount becomes non-uniform or the chamfered portion is completely eliminated, resulting in the required chamfering accuracy. Cannot be secured sufficiently. In particular, in the case of a spectacle lens whose lens surface is largely curved backward along the side surface of the wearer's face, a portion that cannot be chamfered is generated.

  The edge position of the lens subjected to the edging process is such that the measuring element or the lens is moved relatively in the axial direction of the lens (this direction is referred to as the X direction here), the amount of movement in the X direction, It can be determined by measuring the change in the direction orthogonal to the axis (Z direction). If such an operation is performed over the entire circumference of the lens (the lens is rotated about its axis: θ direction), the edge position of the entire lens can be known. However, in such a measuring method, since it is necessary to calculate the edge position by measuring the displacement in the X direction and the Z direction, there is a problem that it takes a long calculation time to calculate the edge position. It was. The same applies when a non-contact type measuring device such as a laser displacement meter is used.

  The present invention has been made to solve such conventional problems, and the object of the present invention is to freely control the chamfering amount corresponding to any spectacle lens. It is an object of the present invention to provide a chamfering method for a spectacle lens that can correct chamfering trajectory data in a short time without requiring a complicated measurement mechanism or complicated calculation, and can perform a desired chamfering process.

  Further, another object of the present invention is to freely control the chamfering amount corresponding to any spectacle lens, and to eliminate chamfering trajectory data in a short time without requiring a complicated measuring mechanism or complicated calculation. It is an object of the present invention to provide a chamfering device for a spectacle lens that can correct the chamfering and can perform a desired chamfering process.

  Furthermore, the other object of this invention is to provide the spectacle lens by which the desired chamfer was made | formed by the said method or apparatus.

  In order to achieve the above object, a method for chamfering a spectacle lens according to a first aspect of the present invention is a method of chamfering a chamfering tool at an edge portion where a peripheral surface of a spectacle lens that has been processed into a predetermined spectacle frame shape intersects with the lens surface. In the method of chamfering a spectacle lens that is used for chamfering, the chamfering tool and a measuring element are mounted, and a plate that is relatively movable in a direction perpendicular to the axis of the spectacle lens is used. First chamfering locus data indicating a machining locus of a chamfering tool when machining the edge portion is calculated based on position data of the edge portion of the spectacle frame shape calculated at the time of processing the peripheral surface of the spectacle lens. Chamfering locus data calculating step, and the first chamfering of the plate in a state where the measuring element is brought into contact with the edge portion of the spectacle lens after finishing the peripheral surface by its own weight. An edge measurement step of measuring the amount of deviation of the edge from the first chamfering trajectory data by moving based on trace data and relatively moving and rotating the spectacle lens and the probe; Second chamfering trajectory data for calculating second chamfering trajectory data for actually performing chamfering processing by correcting the first chamfering trajectory data using the deviation amount obtained in the edge portion measurement step. The plate is moved based on the calculation step and the second chamfering locus data calculated in the second chamfering locus data calculation step, and the chamfering tool and the spectacle lens are relatively moved and rotated. And a chamfering step of chamfering the edge portion by the chamfering tool.

  The eyeglass lens chamfering method according to a second invention is the above-described first invention, wherein the contact surface of the measuring element used in the edge portion measuring step is a cone corresponding to the shape of the grinding surface when the chamfering tool is rotated. Is formed.

  According to a third aspect of the present invention, there is provided a spectacle lens chamfering method in which the contact surface of the measuring element used in the edge measurement step is a spherical surface corresponding to the shape of the ground surface when the chamfering tool is rotated. Is formed.

  A spectacle lens according to a fourth invention is chamfered according to the first invention.

  A spectacle lens chamfering apparatus according to a fifth aspect of the present invention is a spectacle lens chamfering apparatus that chamfers an edge portion where a peripheral surface of a spectacle lens and a lens surface that have been peripherally processed into a predetermined peripheral surface shape intersect with each other. A plate relatively movable in a direction perpendicular to the axis of the spectacle lens, a chamfering tool mounted on the plate for chamfering an edge portion of the spectacle lens, a measuring element for measuring the edge portion, and the spectacles First chamfering locus data calculating means for calculating first chamfering locus data based on the position data of the edge portion of the spectacle frame shape calculated at the time of processing the peripheral surface of the lens, and a measuring element at the edge portion of the spectacle lens The plate is moved based on the first chamfering trajectory data while being in contact with its own weight, and the spectacle lens and the measuring element are relatively moved and rotated. The edge portion measuring means for measuring the deviation amount of the edge portion from the first chamfering locus data, and the first chamfering locus data using the deviation amount measured by the edge portion measuring means. By correcting, the second chamfering trajectory data calculating means for calculating the second chamfering trajectory data for actually performing the chamfering process, and the second chamfering trajectory data calculating means, the second chamfering trajectory data calculating means. Chamfering means for chamfering the edge portion by the chamfering tool by moving the plate based on locus data and relatively moving and rotating the spectacle lens and the chamfering tool. It is.

  In a spectacle lens chamfering apparatus according to a sixth aspect of the present invention, the contact surface of the measuring element of the edge portion measuring means is formed in a cone corresponding to the shape of the ground surface when the chamfering tool is rotated.

  In a spectacle lens chamfering apparatus according to a seventh aspect of the present invention, the contact surface of the measuring element of the edge portion measuring means is formed into a spherical surface corresponding to the shape of the ground surface when the chamfering tool is rotated.

  According to the chamfering method of the present invention, the first chamfering trajectory data calculated based on the position data of the edge portion of the spectacle frame in the edge portion measuring step is corrected in the second chamfering trajectory data calculating step, and the second chamfering trajectory data is calculated. Since chamfering locus data is calculated and chamfering is performed based on the corrected data, the chamfering amount is partially changed or the chamfering amount is made uniform over the entire circumference, depending on how to correct the edge portion. Therefore, a desired chamfering process can be performed on various types of spectacle lenses from a small lens curve to a large lens curve.

  Moreover, according to the spectacle lens according to the present invention, it is possible to change the chamfering amount partially or obtain a spectacle lens having a uniform chamfering amount over the entire circumference.

  Further, according to the spectacle lens chamfering apparatus of the present invention, the spectacle lens includes first chamfering locus data calculating means, edge portion measuring means, second chamfering locus data calculating means, and chamfering processing means. A deviation amount of the edge portion of the peripheral surface deviated from the first chamfering trajectory data calculated during the peripheral surface machining of the chamfering tool is measured by the edge portion measuring means, and the edge portion deviation is measured by the second chamfering trajectory data calculating means. Since the second chamfering trajectory data is calculated by correcting the first chamfering trajectory data calculated at the time of peripheral surface machining using the amount, and the chamfering processing is performed based on this data, Can the chamfering amount be changed partially depending on the correction method, or the chamfering amount can be made uniform over the entire circumference, and the lens curve should be small? Big up things, it is possible to perform desired chamfering for various spectacle lenses.

  Further, according to the chamfering direction and the chamfering device according to the present invention, the deviation amount of the edge portion of the peripheral surface of the spectacle lens from the first chamfering trajectory data calculated at the time of the peripheral surface processing of the chamfering processing tool is the movement direction of the plate. Since there is no deviation between the rotational direction and the axial direction of the spectacle lens only in the direction orthogonal to the axial direction of the spectacle lens, the data correction is simple and the complex necessary for measuring the three-dimensional position of the edge portion. A measuring mechanism and complicated calculations are not required, and high-precision chamfering can be performed easily.

Hereinafter, the present invention will be described based on embodiments shown in the drawings.
FIG. 1 is an overall configuration diagram showing a spectacle lens processing system to which an embodiment of a chamfering method and a chamfering apparatus according to the present invention is applied.
In the figure, a spectacle lens processing system 11, generally indicated by reference numeral 11, includes a factory server 1 and a peripheral processing system 3, which are connected via a communication line LAN 1. In the lens manufacturer's factory, a network such as a lens design system, a lens surface grinding system, a marking system, and an inspection system (not shown) is connected to the factory server 1 through the LAN 1 in addition to the peripheral edge processing system 3. Has been built.

  The factory server 1 obtains prescription information and the like of spectacle lenses from the outside, and designs spectacle lenses so as to conform to the prescription, and includes a storage unit, a calculation control unit, a communication unit, and the like. The storage unit of the factory server 1 stores a design program, a machining data generation program, and the like. The design program has a function of acquiring prescription information for a pair of left and right spectacle lenses and a function of creating design data for each spectacle lens based on the acquired prescription information. The processing data generation program has a function of generating processing data necessary for the peripheral processing system 3 to actually process the lens based on the design data created by the design program.

  The calculation control unit of the factory server 1 executes a design process and the like by executing a design program and the like. In addition, the arithmetic control unit executes the machining data generation program to generate machining data as control information for the peripheral machining system 3 and perform control to transmit the generated machining data to the peripheral machining system 3. The communication unit of the factory server 1 transmits / receives data to / from the peripheral processing system server 4 under the control of the arithmetic control unit.

  The peripheral edge processing system 3 includes a peripheral edge processing system server 4, a peripheral surface processing device 12, a chamfering device 13, and a peripheral length measuring device 14, and based on processing data acquired from a higher-order factory server 1 via the LAN 1. Actually, peripheral processing of the spectacle lens is performed. In FIG. 1, one peripheral processing system 3 is shown for convenience, but a plurality of similar peripheral processing systems 3 may be connected to the factory server 1. The peripheral edge processing system server 4 and each of the devices 12, 13, and 14 are connected via a LAN 2 of a communication line, for example.

  The peripheral processing system server 4 receives from the factory server 1 a job number which is peripheral processing information, lens information such as lens surface shape data, lens shape information of spectacle frames, spectacle wearer layout information such as interpupillary distance, Receives processing instruction information such as presence / absence. The peripheral processing system server 4 centrally manages all peripheral processing information handled by the peripheral processing system 3 and processes such as peripheral processing information management, peripheral processing process management, peripheral processing history management, and control command issuance. I do.

  The peripheral surface processing device 12 includes a peripheral surface processing terminal 5 and a peripheral surface processing unit 6, receives a command from the peripheral surface processing system server 4, and processes the peripheral surface of the spectacle lens according to the command information. It is.

  The chamfering device 13 has a chamfering terminal 7 and a chamfering processing portion 8, and chamfers the edge portion of the peripheral surface of the spectacle lens that has been processed into a target lens shape that fits the spectacle frame by the peripheral surface processing device 12. It is something to apply. The respective terminals of the peripheral surface machining device 12 and the chamfering device 13 and the machining unit are connected by, for example, an RS232C communication line.

  The circumference measuring device 14 includes a circumference measuring terminal 9 and a circumference measuring unit 10, and measures the circumference of a spectacle lens processed into a target lens shape. Similarly, the circumference measuring terminal 9 of the circumference measuring device 14 and the circumference measuring unit 10 are also connected by, for example, an RS232C communication line.

  The peripheral processing of the spectacle lens is composed of a peripheral surface processing step that is a previous step and a chamfering step that is the next step. The peripheral surface processing step is performed by the peripheral surface processing device 12, and the chamfering processing step is performed by the chamfering device 13. Is implemented.

  Although not shown, the peripheral surface processing unit 6 of the peripheral surface processing device 12 holds a spectacle lens at the center of the lens, rotates a spectacle lens held therein, and spectacles held by the lens holding and rotating unit. A lens surface measurement unit that measures the lens surface position along the target lens shape of the spectacle frame used for the lens, and the spectacle lens according to the measurement data obtained by the lens surface measurement unit. The peripheral surface processing unit 4 that performs processing, and the peripheral surface processing system server 4 and the peripheral surface processing terminal 5 cause the peripheral surface processing step shown in FIG. 2 to be performed.

Hereinafter, the peripheral surface machining step will be described with reference to FIGS. 1 and 2.
FIG. 2 is a flowchart showing a peripheral surface processing step of the spectacle lens by the peripheral surface processing apparatus of FIG.
First, the peripheral edge processing system server 4 obtains a barcode of a lens tray in which a spectacle lens is stored, and lens information, lens shape information, layout information, processing instruction information, etc. relating to the spectacle lens corresponding to the barcode. Is acquired from the factory server 1 through the LAN 1 and recognized (S1).

  Next, the peripheral surface processing terminal 5 of the peripheral surface processing apparatus 12 reads the lens shape data of the spectacle frame from the peripheral surface processing system server 4 (S2). The operator attaches the spectacle lens with the lens holder attached at a predetermined position to the lens holding and rotating unit of the peripheral surface processing unit 6 (S3). The lens holding and rotating unit includes a lens rotating shaft and a chuck shaft that are arranged coaxially and sandwich the center of both lens surfaces of the spectacle lens.

  The peripheral surface processing terminal 5 of the peripheral surface processing device 12 uses the lens surface measurement unit to measure the position data of the concave lens surface and the convex lens surface of the spectacle lens along the trajectory of the lens shape of the spectacle frame. (S4). Further, circumferential grinding trajectory data such as a bevel position or a bevel curve is calculated from the obtained position data (S5). Further, the peripheral surface processing terminal 5 operates the peripheral surface processing unit of the peripheral surface processing unit 6 based on the peripheral surface grinding locus data. Thereby, the peripheral surface processing unit 6 performs the lens peripheral surface roughing process (S6) and the lens peripheral surface finishing process (S7).

  Thereafter, the peripheral surface processing terminal 5 calculates first chamfering locus data necessary for the chamfering device 13 based on the respective position data of the concave lens surface and the convex lens surface measured in step S4 (S8). ). The peripheral surface processing terminal 5 transmits the first chamfering trajectory data to the peripheral surface processing system server 4 to notify the end of the peripheral surface processing (S9).

  When the end of the peripheral surface processing is notified, the operator removes the spectacle lens from the peripheral surface processing device 12 with the lens holder mounted, and ends the peripheral surface cutting process to obtain a peripheral surface finished lens. (S10). Then, this lens having the peripheral surface finished is returned to the lens tray.

  In the above-described step S4, the lens surface measurement unit for measuring the lens surface position data has a concave shape of the spectacle lens L along the lens shape of the spectacle frame by the styluses 15 and 16, as shown in FIG. The side lens surface 17A and the convex lens surface 17B are traced, and the positions of the stylus 15 and 16 are detected at each point of the locus. By this detection, the edge portion 18A (the portion where the circumferential surface 20 and the concave lens surface 17A intersect) and the edge portion 18B (the circumferential surface 20 and the convex lens surface) at both ends of the circumferential surface 20 in the state after the circumferential surface finishing process. The position of the crossing point with 17B is measured. Reference numeral 20 'denotes a peripheral surface before peripheral surface finishing.

  The position data of the edge portions 18A and 18B are values defined as three-dimensional data in the rotation direction θ around the lens axis 19 of the spectacle lens L, the radial direction r from the lens axis 19, and the thickness direction t. Therefore, the peripheral surface grinding locus data and the first chamfering locus data calculated from the position data (θ, r, t) of the edge portions 18A and 18B are also three-dimensional data.

  The styluses 15 and 16 come into contact with the positions 100A and 100B outside the lens surface positions that become the edge portions 18A and 18B after the peripheral surface finishing process, so that the concave lens surface 17A and the convex lens surface of the spectacle lens L are obtained. 17B is traced, and from the position data measured by the stylus 15 and 16 at the positions 100A and 100B, the lens surface shape data of the concave lens surface 17A and the convex lens surface 17B, and the like after the peripheral surface finishing processing. You may make it obtain | require the position of edge part 18A, 18B of the spectacle lens L by a calculation. In this way, the stylus 15 or 16 can prevent the effective concave lens surface 17A and convex lens surface 17B after the peripheral surface finishing from being damaged.

Next, the configuration and the like of the chamfering device will be described in detail with reference to FIGS.
4 is a front view showing a chamfering portion in the chamfering apparatus of FIG. 1, FIG. 5 is a plan view showing the chamfering portion of FIG. 4, FIG. 6 is a left side view showing the chamfering portion of FIG. 4 is a right side view showing the chamfered portion of FIG. 4, FIG. 8 is a partial side sectional view showing a chamfered state in the chamfered portion of FIG. 4, and FIG. 9 is an enlarged side view showing a part of FIG.

  In these drawings, as described above, the chamfering device 13 is such that the peripheral surface 20 of the spectacle lens L that has been processed into a predetermined peripheral surface shape intersects the adjacent concave lens surface 17A and convex lens surface 17B. This is a device for chamfering the edge portions 18A and 18B. The chamfering device 13 includes a horizontal movement unit 22 including an X-axis table 21 that is movable in the axial direction (X-axis direction) of the spectacle lens L, and a lens holding and rotation unit including a lens rotation shaft 23 and a chuck shaft 24. 25, a chamfering unit 27 having a chamfering tool 26, an edge portion measuring unit 29 as an edge portion measuring means having a measuring element 28, and second chamfering locus data for calculating second chamfering locus data. It has a chamfering terminal 7 (FIG. 1) that also functions as a calculation unit (means). The horizontal movement unit 22, the lens holding and rotating unit 25, and the chamfering processing unit 27 function as a chamfering processing unit. Further, the peripheral surface processing terminal 5 of the peripheral surface processing device 12 is used as a first chamfering locus data calculation unit in the chamfering device 13.

  The horizontal movement unit 22 includes a plurality of (for example, two) X-axis guide rails 32 arranged in parallel in the horizontal direction on a base 31 in the main body 30 of the chamfering device 13, and these X-axis guides A slide block 33 fixed to the X-axis table 21 is slidably supported on the rail 32. Further, an X-axis ball screw 34 parallel to the X-axis guide rail 32 is rotatably provided on the base 31, and a nut block fixed to the lower surface of the X-axis table 21 is provided on the X-axis ball screw 34. 35 is screwed together. The X-axis ball screw 34 is rotated via a pulley 37 and a timing belt 38 by an X-axis motor 36 installed on the base 31. For example, a stepping motor is used as the X-axis motor 36.

  When the X-axis motor 36 is driven to rotate the X-axis ball screw 34 via the pulley 37 and the timing belt 38, the X-axis table 21 is moved via the nut block 35 screwed to the X-axis ball screw 34. It moves along the X-axis guide rail 32 in the horizontal direction (X-axis direction). This horizontal direction coincides with the thickness direction t (FIG. 3) of the spectacle lens L held by the lens rotating shaft 23 and the chuck shaft 24 of the lens holding and rotating unit 25.

  The lens holding and rotating unit 25 includes a lens block 40 installed above the X-axis table 21 via a plurality of support columns 39, and the lens rotating shaft 23 and the chuck shaft 24 are rotatable in the lens block 40. It is supported. The lens rotation shaft 23 and the chuck shaft 24 are arranged in parallel and coaxial with the moving direction (X-axis direction) of the X-axis table 21. The chuck shaft 24 is connected to a cylinder rod 42 of a chuck cylinder 41 attached to the lens block 40 via a coupling 43. A lens holder 44 attached to the convex lens surface 17B of the spectacle lens L is attached to the tip of the lens rotation shaft 23, and the tip of the chuck shaft 24 pushed out by the chuck cylinder 41 is the concave side of the spectacle lens L. By pressing the lens surface 17A, the spectacle lens L is clamped in cooperation with the chuck shaft 24. The coupling 43 is fixed to the cylinder rod 42 and is coupled to the chuck shaft 24 via a bearing or the like, thereby allowing the chuck shaft 24 to rotate relative to the cylinder rod 42.

  Further, the lens rotation shaft 23 and the chuck shaft 24 are rotationally driven by a lens rotation shaft motor 45 installed in the lens block 40. The lens rotation shaft motor 45 is formed of, for example, a stepping motor, and has a small-diameter pulley 46 installed on the lower side of the lens block 40 and attached to a motor shaft (not shown) as shown in FIGS. is doing. A rotatable interlocking shaft 47 is provided in parallel with the motor shaft of the motor on the rear surface of the lens block 40 and above the lens rotation shaft motor 45, and a large-diameter pulley 48 attached to one end of the interlocking shaft 47. The rotation driving force of the lens rotation shaft motor 45 is decelerated and transmitted to the interlocking shaft 47 by a timing belt 49 stretched between the motor and the small-diameter pulley 46 of the motor shaft.

  A small-diameter pulley 50 is provided integrally with the large-diameter pulley 48. The rotation of the small-diameter pulley 50 is transmitted to the pulley 51 attached to the lens rotation shaft 23 via the timing belt 52. A pulley 53 having the same diameter as the small-diameter pulley 50 is attached to the other end of the interlocking shaft 47, and the rotation of the pulley 53 is transmitted to a spline 54 attached to the chuck shaft 24 via a timing belt 55. The Thereby, when the rotational driving force of the lens rotation shaft motor 45 is decelerated by the large-diameter pulley 48 and transmitted to the interlocking shaft 47, the lens rotation shaft 23 and the chuck shaft 24 rotate at the same rotation speed, and the spectacle lens L Is rotated around the lens axis 19.

  As shown in FIGS. 4 to 7, the chamfering unit 27 includes a Z-axis motor (for example, a stepping motor) 58 and a Z-axis ball arranged in parallel on the back surface side of a support plate 57 provided on the top plate 56 of the main body 30. A screw 59 is provided. On the other hand, on the surface side of the support plate 57, a plurality of (for example, two) guide rails 60 extending in the vertical direction (Z-axis direction orthogonal to the X-axis direction) are arranged in parallel. A slide block 61 provided on the Z-axis table 62 is slidably fitted to 60. The support plate 57 has an opening 63 (FIG. 7) formed substantially at the center, and a nut block 64 protruding from the Z-axis table 62 passes through the opening 63. The nut block 64 is screwed into the Z-axis ball screw 59. The Z-axis table 62 further has a Z-axis plate 65 provided integrally therewith, and a spindle mechanism 66 having a chamfering tool 26 at the tip is attached to the Z-axis plate 65.

  The rotational driving force of the Z-axis motor 58 is transmitted through a pulley 67 attached to the motor shaft, a pulley 68 attached to the Z-axis ball screw 59, and a timing belt 69 stretched between these pulleys. This is transmitted to the ball screw 59, whereby the slide clock 64 is moved up and down along the Z-axis ball screw 59. For this reason, the Z-axis table 62 moves in the vertical direction (Z-axis direction) along the guide rail 60, and moves the spindle mechanism 66 in the same direction. This vertical direction coincides with the radial direction r (FIG. 3) of the spectacle lens L held by the lens holding and rotating unit 25.

  As shown in FIG. 8, the spindle mechanism section 66 includes a spindle case 70, a spindle 71 rotatably incorporated in the spindle case 70, and a chamfering tool 26 attached to the lower end of the spindle 71. . 4 is provided at the upper end of the spindle 71. The spindle motor 73 has a pulley 74 fixed to the motor shaft. A timing belt 75 is stretched between the pulleys 72 and 74. Yes. Therefore, when the spindle motor 73 is driven, the rotational driving force is transmitted to the spindle 71 via the pulley 74, the timing belt 75, and the pulley 72, and the chamfering tool 26 can be rotated at a predetermined rotational speed. As the chamfering tool 26, a ball end mill is used in which the grinding shape at the time of rotation is, for example, a substantially hemispherical shape. The spindle motor 73 is attached downward to the Z-axis table 62 or the Z-axis plate 65.

  The relative position between the chamfering tool 26 and the spectacle lens L is determined by the rotation of the spectacle lens L by the lens rotation shaft 23 and the chuck shaft 24 and the movement of the spectacle lens L by the X-axis table 21 in the horizontal direction (X-axis direction). It is determined by the movement of the chamfering tool 26 in the vertical direction (Z-axis direction) by the Z-axis table 62. The chamfering terminal 7 of the chamfering device 13 includes a lens rotating shaft motor 45 that rotationally drives the lens rotating shaft 23 and the chuck shaft 24, an X axis motor 36 that moves the X axis table 21 in the horizontal direction, and a Z axis. The chamfering tool 26 is controlled by numerically controlling the Z-axis motor 58 that moves the table 62 in the vertical direction, and by controlling the rotational speed, direction, rotation start, stop, and the like of the spindle motor 73 that rotates the chamfering tool 26. Moves in the Z direction and the X direction while rotating at a predetermined number of revolutions, and the edge portions 18A and 18B (FIG. 3) of the spectacle lens L are chamfered. The chamfering terminal 7 controls the chuck cylinder 41 for chucking the spectacle lens L by the lens rotating shaft 23 and the chuck shaft 24 and supplies cutting water to the spectacle lens L and the chamfering tool 26. Controls starting and stopping of a water supply pump (not shown).

  4 and 9, the edge measurement unit 29 of the chamfering device 13 includes a probe case 76 fixed to the Z-axis plate 65 of the chamfering processing unit 27, a bush (not shown), etc. in the probe case 76. The probe rod 77 is rotatably arranged via the. The measuring element rod 77 has upper and lower ends projecting outside the measuring case 76, and a measuring element 28 is attached to the projecting end on the lower end side.

  The contact surface that contacts the spectacle lens L of the probe 28 is formed into a spherical surface corresponding to the shape of the ground surface when the chamfering tool 26 is rotated. In addition, the probe 28 has a vertical position within a range in which the position where the probe 28 contacts the lower surface of the probe case 76 is a top dead center and the position where the collar 78 contacts the upper surface of the probe case 76 is a bottom dead center. It is provided so as to be freely movable (in the Z-axis direction) and rotatable, and is held at the top dead center position so as not to contact the spectacle lens L when the edge portions 18A and 18B of the spectacle lens L are not measured. When released during measurement, it is configured to descend by its own weight and come into contact with the edge portion 18A or 18B.

  On the other hand, the upper end of the probe rod 77 extends above the probe case 76, and a collar 78 having a flange 78A and a sensor shaft 79 are attached. The sensor shaft 79 is provided above the collar 78 and penetrates the magnetic sensor 80 in a non-contact state. The magnetic sensor 80 is attached to the tip of a stay 81 erected on the Z-axis plate 65 and indirectly detects the vertical movement of the sensor shaft 79, in other words, the vertical movement of the probe 28. The Z-axis plate 65 mounts the chamfering tool 26 and the measuring element 28, and when the Z-axis table 62 moves up and down by driving the Z-axis motor 58, it moves up and down integrally therewith.

  The edge measurement unit 29 configured as described above sequentially measures the edge portions 18A and 18B of the spectacle lens L by the measuring element 28. In measurement, the X-axis motor 36 is driven to move the X-axis table 21 in the X direction, the Z-axis motor 58 is driven to move the Z-axis plate 65 in the Z-axis direction, and the probe 28 is moved above the edge portion 18A. Move to. When the probe 28 moves above the spectacle lens L, the driving of the X-axis motor 36 and the Z-axis motor 58 is stopped, the X-axis table 21 and the Z-axis plate 65 are stopped, and the probe 28 is placed in the probe case 76. On the other hand, it is released. When the measuring element 28 is released from the measuring element case 76, the measuring element 28 descends by its own weight and contacts the edge portion 18A. In this state, the spectacle lens L and the Z-axis plate 65 are relative to each other on the basis of the first chamfering locus data (θ, X, Z) for the edge portion 18A calculated in step S8 (FIG. 2) at the time of processing the peripheral surface. Move to and rotate. That is, the spectacle lens L held on the lens rotation shaft 23 and the chuck shaft 24 is rotated around the lens shaft 19 by driving the lens rotation shaft motor 45, and the X-axis table 21 is driven by the X-axis motor 36. It is moved along the guide rail 32 in the X-axis direction. Further, the Z-axis motor 58 is driven to move the Z-axis plate 65 in the Z direction to move to the first measurement positions X1 + ΔX, Y1 and Z1, respectively. X1, Y1, and Z1 are initial chamfering trajectories calculated at the time of processing the lens frame shape, and ΔX is a distance between the rotation centers of the chamfering tool 26 and the probe 28 (FIG. 10). The probe 28 hits the lens so that the chamfering tool 26 contacts the spectacle lens L, and measures the position of the probe 28 at this position. At this time, if the lens hits exactly the same as the chamfering tool 26, the amount of blur is 0, and if it hits differently, it is reflected in the measured value as a shift amount. Next, the X-axis table 21 and the Z-axis plate 65 are moved to the second measurement positions X 2 + ΔX, Y 2, Z 2 by driving the motor, and the position of the probe 28 is measured. This is performed all around the lens.

  When the spectacle lens L is rotated about its axis, the probe 28 that is in contact with the edge 18A by its own weight moves up and down in accordance with the displacement of the edge 18A in the Z direction, and the vertical movement of the probe 28 is magnetic. The sensor 80 measures the position data of the edge portion 18A. Then, the position data of the edge portion 18A is compared with the position data in the Z direction of the first chamfering trajectory data for the edge portion 18A calculated in step S8 (FIG. 2) at the time of processing the peripheral surface. A displacement amount ΔZ (FIG. 10) in the Z-axis direction of the position data with respect to the chamfering locus data is calculated. The chamfer measurement method according to the present invention is characterized in that a deviation including (θ, X) can be corrected in a uniaxial measurement system in the Z direction by using a chamfer locus calculated at the time of lens frame shape processing at the time of measurement. It is what.

  When the measurement of the one edge portion 18A by the measuring element 28 is completed, the measurement of the other edge portion 18B is similarly performed. When measuring the edge portion 18B, the spectacle lens L is moved a predetermined distance in the X-axis direction by driving the X-axis motor 36 so that the probe 28 is positioned above the other edge 18B, and the probe 28 is moved by its own weight. It is made to contact edge part 18B. In this state, the eyeglass lens L and the Z-axis plate 65 are first chamfered locus data (θ, X, Z) for the edge portion 18B calculated in step S8 (FIG. 2) at the time of processing the peripheral surface in the same manner as described above. ) Is moved and rotated relatively, and the vertical movement of the probe 28 is measured by the magnetic sensor 80 as the position data of the edge portion 18B. Then, the position data of the edge portion 18B is compared with the first chamfering locus data for the edge portion 18B calculated in step S8 (FIG. 2) at the time of peripheral surface machining, and the position with respect to the first chamfering locus data is compared. A shift amount ΔZ (FIG. 10) in the Z-axis direction of data is calculated.

  That is, in the present invention, as shown in FIG. 10, the chamfering tool 26 and the measuring element 28 are mounted on the Z-axis plate 65 of the chamfering terminal 7 (FIG. 1) while being spaced apart by ΔX in the X-axis direction. deep. Then, when measuring the edge portions 18A and 18B of the spectacle lens L, the first chamfering locus data calculated in step S8 in FIG. 2 is shifted in the X-axis direction by the distance ΔX between the measuring element 28 and the chamfering tool 26. The measuring element 28 is brought into contact with the edge portion 18A or 18B for measurement, and the deviation amount ΔZ from the first chamfering locus data of each edge portion 18A, 18B is measured.

  The peripheral surface 20 of the spectacle lens L is ideally processed by the peripheral surface processing device 12, and there is a deviation regarding the holding (chucking) of the spectacle lens L between the peripheral surface processing device 12 and the chamfering device 13. If not, the edge portions 18A and 18B of the spectacle lens L held by the lens rotation shaft 23 and the chuck shaft 24 of the chamfering device 13 are the first chamfering trajectory data calculated in step S8 at the time of peripheral surface processing. Match. For this reason, the shift amount ΔZ from the first chamfering trajectory data of the edge portions 18A and 18B becomes zero, and this zero position is measured by the edge portion measuring unit 29 and stored in the chamfering processing terminal 7.

  Further, when the spectacle lens L is processed into a small size (small diameter) by processing the peripheral surface by the peripheral surface processing device 12, the spectacles held by the lens rotating shaft 23 and the chuck shaft 24 as shown in FIG. In the lens L, the edge portions 18A and 18B of the peripheral surface 20 are shifted downward with respect to the first chamfering locus data calculated in step S8 during peripheral surface processing. For this reason, the measuring element 28 is lowered by its own weight as much as the size is reduced, and contacts the edge portions 18A and 18B of the spectacle lens L. Then, the edge measurement unit 29 provided with the measuring element 28 determines the amount of deviation from the first chamfering locus data of the edge portions 18A and 18B on the peripheral surface 20 of the spectacle lens L in the vertical (Z-axis) direction. The amount ΔZ = ΔZ1 is measured, and this deviation amount ΔZ1 is stored in the chamfering terminal 7. Here, the shift amount ΔZ1 coincides with the difference between the lower end height of the measuring element 28 and the lower end height of the chamfering tool 26 that moves based on the first chamfering trajectory data calculated during the peripheral surface machining.

  Further, for example, the chucking operation may be performed a plurality of times in order to hold the spectacle lens L on the lens rotation shaft 23 and the chuck shaft 24 of the lens holding rotation unit 25 in the chamfering device 13. In such a case, as shown in FIG. 12, in the spectacle lens L held by the lens rotation shaft 23 and the chuck shaft 24, the edge portions 18A and 18B of the peripheral surface 20 are processed at step S8 in FIG. May be displaced in the horizontal direction (X-axis direction) with respect to the first chamfering trajectory data calculated in (1). In this case, in the first chamfered trajectory data, the spectacle lens L at the position of the broken line in FIG. 12 becomes the solid line position, and the measuring element 28 is lowered by its own weight until it contacts the edge portions 18A and 18B of the spectacle lens L. To do. Therefore, the edge measurement unit 29 including the measuring element 28 uses the amount of deviation from the first chamfer locus data of the edge portions 18A and 18B of the spectacle lens L as the vertical (Z-axis) movement direction of the chamfering tool 26. The amount of deviation ΔZ = ΔZ2 is measured using the probe 28. This deviation amount ΔZ2 is stored in the chamfering terminal 7. Here again, the shift amount ΔZ2 coincides with the difference between the lower end height of the measuring element 28 and the lower end height of the chamfering tool 26 that moves based on the first chamfering trajectory data calculated during the peripheral surface machining.

  FIG. 13 shows a change in the shift amount ΔZ obtained over the entire circumference of the edge portion 18A or 18B with respect to the peripheral surface 20 of one spectacle lens L held by the lens rotation shaft 23 and the chuck shaft 24 of the lens holding rotation unit 25. FIG. This deviation amount ΔZ is a step shown in FIG. 2 at the time of peripheral surface machining with respect to a chamfering locus that is a locus that connects the positions of the edge portions 18A and 18B of the spectacle lens L held by the lens rotation shaft 23 and the chuck shaft 24. This is the deviation amount when the chamfering locus based on the first chamfering locus data obtained in S8 is deviated. That is, this shift amount ΔZ is a shift amount when the vertical position of the chamfering tool 26 is shifted from the corresponding position indicated by the first chamfering trajectory data obtained previously. In FIG. 13, the horizontal axis is the rotational angle position around the lens axis 19 of the edge portions 18 </ b> A and 18 </ b> B on the peripheral surface 20 of the spectacle lens L held by the lens rotation axis 23 and the chuck axis 24. The vertical axis indicates the amount of deviation ΔZ from the first chamfering trajectory data of the edge portions 18A and 18B. In this case, ΔZ is often shown as ΔZ in FIG. 13 for ease of explanation, although there are many cases where the state of change is different between the edge portion 18A and the edge portion 18B.

  In FIG. 13, when the deviation amount ΔZ is zero, the measuring element 28 is at the same height as the chamfering tool 26, and the edge portions 18A, 18B of the spectacle lens L are in the horizontal direction (X-axis direction) at the angular position. When there is no deviation, it indicates that it matches the first chamfering trajectory data calculated during the peripheral surface machining.

  Further, when the value of the shift amount ΔZ is positive, the edge portions 18A and 18B of the spectacle lens L are at a position in a direction away from the lens axis 19 with respect to the first chamfered locus data at the angular position, or horizontal. This indicates that the eyeglass lens L is displaced on the opposite side of the chamfering processing tool 26 in the direction (X-axis direction).

  Further, when the value of the shift amount ΔZ is negative, the edge portions 18A and 18B of the spectacle lens L are in the position closer to the lens axis 19 than the first chamfered locus data at the angular position, or horizontal. This indicates that the eyeglass lens L is displaced on the chamfering tool 26 side in the direction (X-axis direction).

  Note that, as described above, the deviation amount of the edge portions 18A and 18B on the peripheral surface 20 of the spectacle lens L from the first chamfering trajectory data of the chamfering tool 26 calculated at the time of peripheral surface processing is calculated by the chamfering tool 26. The condition that can be accurately measured as the deviation amount ΔZ in the vertical (Z-axis) moving direction is that the peripheral surface 20 processed during peripheral surface processing is within an allowable tolerance range. When the edge portions 18A and 18B are measured by the edge portion measurement unit 29 using the measuring element 28, the deviation amount ΔZ from the first chamfered locus data of the edge portions 18A and 18B deviates from an allowable value (for example, ± 2 mm). If this is the case, the chamfering terminal 7 (FIG. 1) determines that the peripheral surface 20 of the spectacle lens L is out of the tolerance range, and stops the subsequent measurement.

  In the chamfering terminal 7, data in the Z-axis direction among the first chamfering locus data of the chamfering tool 26 calculated in step S <b> 8 in FIG. Of the deviation amount ΔZ of the edge portions 18A and 18B of the spectacle lens L, that is, the deviation amount of the edge portions 18A and 18B deviated from the first chamfering trajectory data calculated during the peripheral surface machining, the chamfering measured by the measuring element 28. Using the amount of deviation in the vertical (Z-axis) movement direction of the processing tool 26, correction is performed as follows, and second chamfering trajectory data is calculated.

For example, when the deviation amount ΔZ of the edge portions 18A and 18B of the spectacle lens L measured by the edge portion measurement unit 29 is on the plus side shown in FIG. 13, the chamfering processing terminal 7 uses the plus deviation amount ΔZ. In order to cancel, the Z-axis direction data of the first chamfering trajectory data calculated at the time of peripheral surface machining is shifted to the negative side and corrected. When the deviation amount ΔZ of the edge portions 18A and 18B of the spectacle lens L measured by the edge portion measurement unit 29 is on the minus side shown in FIG. 13, the chamfering terminal 7 uses the minus deviation amount ΔZ. In order to cancel, the Z-axis direction data of the first chamfering trajectory data calculated during the peripheral surface machining is shifted to the plus side and corrected. When the shift amount ΔZ of the edge portions 18A and 18B of the spectacle lens L measured by the edge portion measurement unit 29 is zero, the chamfering terminal 7 uses the first chamfering trajectory data calculated during the peripheral surface processing. The Z-axis direction data is used as it is.
These relationships are expressed in the following equations.
Ai = Bi-.DELTA.Zi (1)
However, Ai is the second chamfering trajectory data at the predetermined angular position i, Bi is the first chamfering trajectory data at the predetermined angular position i, and ΔZi is the amount of deviation from the first chamfering trajectory data at the predetermined angular position i. Indicates.

  In this way, when the first chamfering trajectory data is calculated by correcting the first chamfering trajectory data so that the deviation amount ΔZ is zero over the entire circumference of the edge portions 18A and 18B, the entire circumference of the edge portions 18A and 18B is calculated. The chamfering amount can be made uniform over the entire area. However, in the present invention, it is not necessary to correct the deviation amount ΔZ over the entire circumference of the edge portions 18A and 18B so that it becomes zero. If the correction value is partially changed, the chamfering amount can be freely changed. A desired chamfering process suitable for the spectacle lens may be performed.

  When chamfering the spectacle lens L, the chamfering tool 26 of the chamfering processing unit 27 chamfers the edge portions 18A and 18B of the spectacle lens L. That is, the chamfering terminal 7 obtains the first chamfering locus data so that the deviation amount ΔZ of the edge portions 18A and 18B of the spectacle lens L measured by the edge portion measuring unit 29 becomes zero over the entire circumference of the edge portion. By correcting, the second chamfering trajectory data is calculated. Then, based on the second chamfered locus data, the lens rotation shaft 23 of the lens holding rotation unit 25 and the eyeglass lens L held by the chuck shaft 24 are driven around the lens shaft 19 by driving the lens rotation shaft motor 45. While rotating, the X axis motor 36 is driven to move in the horizontal direction (X axis direction). Further, the chamfering processing tool 26 of the chamfering processing unit 27 is rotated by driving the spindle motor 73, and the Z-axis plate 65 is moved in the vertical direction (Z-axis direction) by driving the Z-axis motor 58. The edge portions 18A and 18B are sequentially chamfered by contacting the edge portions 18A or 18B. Thereby, the spectacle lens L with a uniform chamfering amount is obtained over the entire circumference of each edge 18A, 18B.

  Further, when correcting the displacement amount ΔZ, the amount of chamfering does not become uniform if the displacement amount ΔZ is not partially reduced to zero rather than being made zero over the entire circumference of the edge portions 18A and 18B. The chamfered part can be emphasized or weakened.

Next, a chamfering process performed by the chamfering apparatus 13 configured as described above will be described with reference to FIG.
First, the peripheral edge processing system server 4 (FIG. 1) acquires a barcode of a lens tray that stores a lens that has been subjected to peripheral surface finishing processing, and stores lens surface shape data relating to the spectacle lens L corresponding to the barcode. The lens information, the lens shape information of the spectacle frame, the layout information such as the distance between the pupils of the spectacle wearer, the processing instruction information such as the presence or absence of the bevel is acquired and recognized through the LAN 1 from the factory server 1 (S11).

  The chamfering terminal 7 reads the first chamfering trajectory data calculated in step S8 (FIG. 2) during peripheral surface processing from the peripheral processing system server 4 (S12).

  The operator chucks the spectacle lens L having the lens holder 44 (FIG. 4) attached at a predetermined position in the peripheral surface processing step to the lens rotation shaft 23 and the chuck shaft 24 of the lens holding and rotating unit 25 in the chamfering processing unit 8. To fix (S13).

  Thereafter, the peripheral surface 20 is finished and the edge portions 18A and 18B of the peripheral surface 20 are edged with respect to the lens rotation shaft 23 of the lens holding and rotating unit 25 of the chamfering device 13 and the spectacle lens L held on the chuck shaft 24. An edge measurement process for measuring using the measurement unit 29 is performed (S14, S15). Next, using the measurement data obtained in this edge portion measurement step, a second chamfering locus data calculation step is performed in which the first chamfering locus data is corrected to calculate second chamfering locus data (S16). ).

  Next, based on the second chamfering trajectory data obtained in the second chamfering trajectory data calculation step, a chamfering process for chamfering the edge portions 18A and 18B of the spectacle lens L using the chamfering tool 26 is performed. (S17 to S20).

  In the edge portion measurement process, when the chamfering device 13 is turned on by the operator, the chamfering terminal 7 of the chamfering device 13 uses the edge portion measuring unit 29 in the chamfering portion 8. First, the edge portion 18A of the spectacle lens L held by the lens holding and rotating unit 25 is obtained from the first chamfering trajectory data of the chamfering tool 26 calculated at the time of peripheral surface processing for chamfering the edge portion 18A. The amount of deviation is measured as the amount of deviation ΔZ in the vertical (Z-axis) movement direction of the chamfering tool 26 (S14).

  Next, in the same way, the chamfering terminal 7 shifts the edge portion 18B of the spectacle lens L from the first chamfering trajectory data calculated during the peripheral surface processing for chamfering the edge portion 18B. Is measured as a shift amount ΔZ in the vertical (Z-axis) movement direction of the chamfering tool 26 (S15). Note that the order of these steps S15 and S16 may be reversed.

  In the second chamfering trajectory data calculating step, the chamfering terminal 7 uses the first chamfering trajectory data for chamfering the edge portion 18A of the chamfering tool 26 calculated in step S8 during peripheral surface processing. Then, correction is performed using the amount of deviation ΔZ from the first chamfering locus data at the edge portion 18A of the spectacle lens L obtained in step S14, and second chamfering locus data is calculated. Further, the chamfering terminal 7 uses the chamfering tool 26 calculated in step S8 of the peripheral surface machining step to obtain first chamfering trajectory data for chamfering the edge portion 18B of the chamfering tool 26 obtained in step S15. Correction is performed by using the shift amount ΔZ from the first chamfering locus data at the edge portion 18B of the lens L, and second chamfering locus data is calculated (S16).

  In the chamfering process, the chamfering terminal 7 first drives the spindle motor 73 of the chamfering unit 27 to rotate the chamfering tool 26 and starts a water supply pump (not shown) to start the chamfering tool 26 and the spectacle lens. Cutting water is supplied to L (S17). Next, based on the corrected second chamfering trajectory data for chamfering the edge portion 18A of the spectacle lens L obtained in step S16, the chamfering terminal 7 rotates the X-axis motor 36 and the lens. The shaft motor 45 and the Z-axis motor 58 are driven, and the chamfering processing is performed on the edge portion 18A of the spectacle lens L using the chamfering processing tool 26 (S18).

  Next, based on the corrected second chamfering trajectory data for chamfering the edge portion 18B of the spectacle lens L obtained in step S16, the chamfering terminal 7 uses the X-axis motor 36, the lens rotation axis, and the like. The motor 45 and the Z-axis motor 58 are driven, and the chamfering processing is performed on the edge portion 18B of the spectacle lens L using the chamfering processing tool 26 (S19). After chamfering is performed over the entire circumference of the edge portion 18A and the edge portion 18B of the spectacle lens L, the chamfering terminal 7 stops the spindle motor 73 to stop the chamfering processing tool 26 from rotating and stops the water supply pump. Then, the supply of cutting water is stopped (S20).

  After the end of the chamfering process, the chamfering terminal 7 notifies the peripheral edge processing system server 4 of the end of the chamfering process (S21). When the end of the chamfering process is notified, the operator removes the spectacle lens L from the lens holding and rotating unit 25 in the chamfering processing unit 8 of the chamfering apparatus 13 to finish the chamfering process, and obtains the spectacle lens L that has been chamfered. (S22).

  As described above, the spectacle lens chamfering method and chamfering apparatus according to the present invention includes the chamfering tool 26 and the measuring element 28 and is movable in the Z-axis direction perpendicular to the axis of the spectacle lens l. It has. Further, the contact surface of the probe 28 is formed into a spherical surface corresponding to the ground surface when the chamfering tool 26 is rotated during chamfering, and is brought into contact with the edge portions 18A and 18B by its own weight when measuring the edge portions 18A and 18B. I am doing so. Further, the edge of the spectacle frame shape calculated when the peripheral surface processing of the spectacle lens L is first chamfered trajectory data indicating the processing trajectory of the chamfering processing tool 26 when the edge portions 18A and 18B are processed by the chamfering processing tool 26 in advance. It is calculated by calculation based on the position data of the part. Then, the Z-axis plate 65 is moved based on the first chamfering locus data while the measuring element 28 is in contact with the edge portions 18A and 18B by its own weight, and the spectacle lens L and the measuring element 28 are relatively moved and rotated. Let As a result, the deviation amount ΔZ from the first chamfering locus data of the edge portions 18A and 18B is measured, and the first chamfering locus data is corrected using the deviation amount ΔZ to calculate the second chamfering locus data. I am doing so. Then, the edge portions 18A and 18B are chamfered by relatively moving and rotating the spectacle lens L and the chamfering processing tool 26 based on the calculated second chamfering locus data. Depending on the correction method, the chamfering amount can be made uniform or partially changed over the entire circumference of the edge portion, and a desired chamfering process can be performed. Further, since the correction of the shift amount is only the shift amount ΔZ in the Z-axis direction, a complicated measurement mechanism and a complicated calculation necessary for measuring the three-dimensional positions of the edge portions 18A and 18B are unnecessary, and high accuracy is achieved. Chamfering can be easily performed.

While the present invention has been described based on the embodiments, the present invention is not limited to this.
For example, in the present embodiment, the case where the contact surface of the probe 28 is formed to be the same spherical surface as the ground surface when the chamfering tool 26 is rotated has been described. In the case of a spectacle lens that is not formed, the chamfering tool 26 and the measuring element 28 may be formed in a triangular pyramid shape. When the chamfering tool 26 and the probe 28 are formed in the same triangular pyramid shape, the contact surface of the probe 28 is a cone, so that the position of the spectacle lens L is in the vertical (Z axis) direction or horizontal (X axis). ) Even if it is deviated in any of the moving directions, the angle of the chamfering is always kept constant even if the position in the vertical (Z-axis) direction when contacting the spectacle lens L is different. In particular, when the spectacle lens L is displaced in the horizontal (X-axis) movement direction, it is preferably a triangular pyramid shape.

  In the present embodiment, the peripheral surface processing device 12 and the chamfering device 13 are separated from each other. However, the peripheral surface processing device 12 may have a built-in device having the function of the chamfering device 13. Good. In this case, it is possible to prevent the occurrence of deviation due to chucking of the spectacle lens L.

1 is an overall configuration diagram showing a spectacle lens processing system to which an embodiment of a chamfering method and a chamfering apparatus according to the present invention is applied. It is a flowchart which shows the peripheral surface manufacturing process of the spectacle lens by the peripheral surface processing apparatus of FIG. It is a side view which shows the measurement condition of the position data of the concave side lens surface in FIG. 2, and a convex side lens surface. It is a front view which shows the chamfering process part in the chamfering apparatus of FIG. It is a top view which shows the chamfering process part of FIG. It is a left view which shows the chamfering process part of FIG. It is a right view which shows the chamfering process part of FIG. It is a partial sectional side view which shows the chamfering process state in the chamfering process part of FIG. It is a side view which expands and shows a part of FIG. It is a figure which shows the measurement condition of the edge part of the spectacle lens surrounding surface by the measuring element of FIG. It is a figure which shows the measurement condition of the edge part of the spectacle lens surrounding surface by the measuring element of FIG. It is a figure which shows the measurement condition of the edge part of the spectacle lens surrounding surface by the measuring element of FIG. It is a graph which shows the change of the shift | offset | difference amount from the 2nd 1st chamfering locus data of the peripheral surface edge part of a spectacle lens measured by the probe. It is a flowchart which shows the chamfering process process which chamfers the edge part of the surrounding surface of a spectacle lens with the chamfering apparatus of FIG.

Explanation of symbols

  5 ... Terminal for peripheral surface machining (first chamfering trajectory data calculating means), 6 ... Peripheral surface machining unit, 7 ... Terminal for chamfering processing (second chamfering trajectory data calculating means), 8 ... Chamfering processing unit, 10 ... Peripheral length measurement unit, 12 ... peripheral surface processing device, 13 ... chamfering device, 15, 16, 28 ... measuring element, 18A, 18B ... edge portion, 19 ... lens shaft, 24 ... chuck shaft, 26 ... chamfering tool, 27 ... chamfering unit (chamfering means), 29 ... edge part measuring unit (edge part measuring means), 65 ... Z-axis plate, L ... spectacle lens.

Claims (7)

In the chamfering method of a spectacle lens that performs chamfering using a chamfering processing tool at an edge portion where the peripheral surface and the lens surface of the spectacle lens that has been processed into a predetermined spectacle frame shape intersect,
The chamfering tool and the measuring element are mounted, and the plate is relatively movable in a direction orthogonal to the axis of the spectacle lens,
First chamfering locus data indicating a machining locus of the chamfering tool when the edge portion is machined by the chamfering tool is calculated based on the position data of the edge portion of the spectacle frame shape calculated at the time of processing the peripheral surface of the spectacle lens. A first chamfering trajectory data calculation step obtained by:
The plate is moved based on the first chamfering locus data in a state where the measuring element is brought into contact with the edge portion of the spectacle lens after the peripheral surface finishing by its own weight, and the spectacle lens and the measuring element are relatively moved. An edge portion measuring step for measuring a deviation amount of the edge portion from the first chamfering trajectory data by moving and rotating automatically,
Second chamfering trajectory data for calculating second chamfering trajectory data for actually performing chamfering processing by correcting the first chamfering trajectory data using the deviation amount obtained in the edge portion measurement step. A calculation process;
The chamfering is performed by moving the plate based on the second chamfering trajectory data calculated by the second chamfering trajectory data calculating step and relatively moving and rotating the chamfering tool and the spectacle lens. A chamfering process in which the edge portion is chamfered by a processing tool;
A method for chamfering a spectacle lens, comprising:   2. The method for chamfering a spectacle lens according to claim 1, wherein the contact surface of the measuring element used in the edge portion measuring step is formed in a cone corresponding to the shape of the ground surface when the chamfering tool is rotated.   2. The method for chamfering a spectacle lens according to claim 1, wherein the contact surface of the measuring element used in the edge portion measurement step is formed into a spherical surface corresponding to the shape of the ground surface when the chamfering tool is rotated.   2. A spectacle lens that is chamfered by the chamfering method according to claim 1. In the chamfering device for spectacle lenses that chamfers the edge portion where the peripheral surface of the spectacle lens and the lens surface that have been processed into a predetermined peripheral surface shape intersect,
A plate relatively movable in a direction perpendicular to the axis of the spectacle lens;
A chamfering tool for chamfering an edge portion of the spectacle lens mounted on the plate and a measuring element for measuring the edge portion;
First chamfering trajectory data calculating means for calculating first chamfering trajectory data based on position data of the edge portion of the spectacle frame shape calculated at the time of processing the peripheral surface of the spectacle lens;
The plate is moved based on the first chamfering trajectory data in a state where the measuring element is brought into contact with the edge portion of the spectacle lens by its own weight, and the spectacle lens and the measuring element are relatively moved and rotated. An edge portion measuring means for measuring a deviation amount of the edge portion from the first chamfering trajectory data,
A second chamfering locus for calculating second chamfering locus data for actually performing chamfering processing by correcting the first chamfering locus data by using the deviation amount measured by the edge portion measuring means. Data calculation means;
The chamfering is performed by moving the plate based on the second chamfering trajectory data calculated by the second chamfering trajectory data calculating unit and relatively moving and rotating the spectacle lens and the chamfering tool. Chamfering means for chamfering the edge portion with a processing tool;
A chamfering device for spectacle lenses, comprising:   6. The eyeglass lens chamfering apparatus according to claim 5, wherein the contact surface of the measuring element of the edge portion measuring means is formed in a cone corresponding to the shape of the ground surface when the chamfering tool is rotated.   6. The eyeglass lens chamfering apparatus according to claim 5, wherein a contact surface of the measuring element of the edge portion measuring means is formed into a spherical surface corresponding to a grinding surface shape when the chamfering tool is rotated.

Images