JP2008030170A - Spectacle lens machining device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spectacle lens machining device allowing the reduction of the number of parts, the reduction of a size and weight and the reduction of cost by a simple structure. <P>SOLUTION: A machining tool rotary shaft 70 is provided at the tip of a rotary arm 51. A first machining tool group 74 and a second machining tool group 90 are provided at each end of the machining tool rotary shaft 70. The first machining tool group 74 is constituted of an end mill 75 and a grinding tool 76. The second machining tool group 90 is constituted of an end mill 91, a grinding tool 92 and a groove excavation cutter 93. The end mill 75, the grinding tool 76 and the end mill 91 and the grinding tool 92 are symmetrically provided across the rotation center O of the machining tool rotary shaft 70. The first and the second machining tool groups 74 and 90 are switched by reversing the machining tool rotary shaft 70 by rotating the rotary arm 51 at about 180°. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an eyeglass lens processing apparatus that manufactures a lens lens corresponding to the frame shape of an eyeglass frame by edging and drilling a circular workpiece lens.

  Equipped with a plurality of processing tools, a circular lens to be processed is processed into a target lens shape corresponding to the frame shape of the spectacle frame, and then edge trimming (beveling, flattening, chamfering) and drilling are performed. As a processing apparatus for manufacturing a spectacle lens of a desired shape, for example, a spectacle lens processing apparatus disclosed in Patent Document 1 is known.

  In the spectacle lens processing apparatus described in Patent Document 1, a lens rotating means having a lens rotating shaft for holding a spectacle lens and a first bevel finishing grindstone for forming a bevel on the periphery 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 at the periphery of the spectacle lens. A second grindstone rotating means; and a selecting means for selecting which of the first grindstone rotating means and the second grindstone rotating means to use during the beveling process. In addition, this processing apparatus forms a first bevel finishing grindstone in a cylindrical shape, forms a second bevel finishing grindstone in a conical shape, and has a diameter less than half that of the first bevel finishing grindstone. Therefore, the interference between the grindstone and the formed bevel is prevented, and the bevel thinning (reduction in the width and height of the bevel) is suppressed.

Japanese Patent Laying-Open No. 2005-074560

  However, in the spectacle lens processing apparatus described in Patent Document 1, the rotation axis of the processing tool is a two-axis system, and the first grindstone rotating means and the second grindstone rotating means are driven and controlled independently of each other. Since it is provided on the rotating shaft, there is a problem in that the structure is complicated and the number of parts is increased, resulting in an increase in size and weight as well as an increase in manufacturing cost.

  The present invention has been made in order to solve the above-described conventional problems. The object of the present invention is to provide a spectacle lens processing apparatus that has a simple structure, can reduce the number of parts, can be reduced in size and weight, and can be reduced in cost. Is to provide.

  In order to achieve the above object, an eyeglass lens processing apparatus according to the present invention is a spectacle lens processing apparatus that manufactures a lens lens corresponding to the frame shape of an eyeglass frame by edging and punching a circular workpiece lens. A lens rotation shaft for holding the lens to be processed, a lens rotation shaft driving motor for rotating the lens rotation shaft, a processing tool rotation shaft provided corresponding to the lens rotation shaft, and the processing tool. A processing tool composed of a first processing tool group attached to one end side of the tool rotation shaft and a second processing tool group attached to the other end side; a rotating arm that holds the processing tool rotation shaft; A processing tool rotating shaft drive motor for rotating the processing tool rotating shaft, and a processing tool group switching for rotating the rotation arm about a predetermined angle around the axis when switching between the first and second processing tool groups. With motor Than is.

  In the eyeglass lens processing apparatus according to the present invention, the first and second processing tool groups each include an end mill and a grindstone, and are arranged symmetrically with respect to the rotation center of the processing tool rotation shaft. Is.

  The eyeglass lens processing apparatus according to the present invention is a roughing end mill in which an end mill of the first processing tool group pulls out a lens from a lens to be processed, and the grindstone is a primary beveling portion, a primary flat surface. A processing part, a primary convex chamfering part, and a primary concave chamfering part are integrally provided.

  The eyeglass lens processing apparatus according to the present invention is a drilling end mill in which the end mill of the second processing tool group drills the edge surface or the optical surface of the lens lens as necessary, and the grindstone is secondary. A beveled portion, a secondary flattened portion, a secondary convex chamfered portion, and a secondary concave chamfered portion are integrally provided.

  In the eyeglass lens processing apparatus according to the present invention, the second processing tool group further includes a grooving cutter for grooving the edge surface of the target lens.

  In the present invention, the first processing tool group is provided on one end side of the processing tool rotation shaft, the second processing tool group is provided on the other end side, and the processing tool rotation shaft is rotated at a required angle by rotating the rotary arm. Since the first and second processing tool groups are configured to be switched and used, the processing tool rotating shaft can be a single-shaft type composite processing device, which simplifies the structure, reduces the number of parts, Light weight and downsizing and cost reduction can be achieved.

  In the present invention, the end mill of the first processing tool group punches out the lens lens from the lens to be processed, and the grindstone is subjected to primary beveling and primary flattening on the punched lens lens. Machining, primary convex chamfering and primary concave chamfering. In addition, the end mill of the second processing tool group drills the edge surface or optical surface of the lens, and the grindstone performs secondary beveling, secondary flattening, secondary convex chamfering, and secondary concave chamfering. Since the processing is performed, it is possible to manufacture a spectacle lens to be attached to a general spectacle frame with a rim and a spectacle frame without a rim (rimless spectacle frame).

  Furthermore, in the present invention, since the grooved cutter for grooving the edge surface of the target lens is provided, it is possible to manufacture a spectacle lens to be mounted on the nyroll frame.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
1 is a perspective view showing an internal structure of a spectacle lens processing apparatus according to the present invention, FIG. 2 is a transverse sectional view of a processing tool rotating mechanism of the processing apparatus, FIG. 3 is a longitudinal sectional view of the processing tool rotating mechanism, and FIG. Is a cross-sectional view of the lens rotation shaft, FIG. 5 is a diagram showing a machining process, FIG. 6 is a diagram showing a state where a lens to be machined is roughed by an end mill, FIG. 7 is a diagram showing a machining locus of the end mill, FIG. Is a diagram showing a state of primary beveling, FIG. 9 is a diagram showing a state of primary flattening, FIG. 10 is a diagram showing a state of primary convex chamfering processing, and FIG. 11 is a primary concave chamfering processing. FIG. 12 is a diagram illustrating a state where secondary beveling is being performed, FIG. 13 is a diagram illustrating a state where secondary flattening is being performed, and FIG. 14 is a state where secondary convex chamfering is being performed FIG. 15 is a diagram showing a state where the secondary concave chamfering is being processed, and FIG. Shows a digging processed to have the state, FIG 17 is a view showing a state diagram showing a state of processing drilling an optical surface, 18 that are machined drilling the edge surface.

  1 to 4, in the present embodiment, the lens rotation shaft 4 and the processing tool rotation mechanism 7 are operated in three directions, respectively, and the operation in a total of six directions is numerically controlled so that the lens 3 to be processed is a spectacle frame. An example will be described in which the present invention is applied to a compound eyeglass lens processing apparatus 1 that processes a lens shape corresponding to a frame shape and then continuously performs edge-grinding processing and drilling processing on the lens lens. The three movements of the lens rotation shaft 4 are rotation, left-right movement, and vertical movement. The three movements of the processing tool rotation mechanism 7 are rotation of the processing tool rotation shaft 70 and movement in the front-rear direction. And rotation in a vertical plane. In the present invention, for convenience of explanation, the left-right direction of the spectacle lens processing apparatus 1 is shown as the X direction, the up-down direction as the Y direction, and the front-back direction as the Z direction.

  The spectacle lens processing apparatus 1 includes a box-shaped housing 2 installed on a floor surface, a lens rotation shaft 4 that holds a processing target lens 3 incorporated in the housing 2, and the lens rotation shaft 4. A first lens rotation axis moving mechanism 5 that moves in the X direction, a second lens rotation axis moving mechanism 6 that similarly moves the lens rotation axis 4 in the Y direction, and roughing and edging of the lens 3 to be processed. And a processing tool rotating mechanism 7 for drilling, and a control unit (not shown) for controlling these mechanisms, the rotating shafts 4, 70 and the entire apparatus.

  The lens 3 to be processed is formed of a circular plastic lens molded by a casting polymerization method, and the optical center is aligned with the axis of the lens rotation shaft 4 and is attached to the lens rotation shaft 4. There are cases where it is worn eccentrically.

  As shown in FIG. 4, the lens rotation shaft 4 is composed of a pair of left and right rotation shafts 4A and 4B which are arranged horizontally in the X direction with their axes aligned. One rotating shaft 4A is provided with a lens holder 10 that can detachably attach the convex surface 3a of the lens 3 to be processed at one end, and the other end is rotatably supported by one arm 11a of the Y-direction slider 11 (FIG. 1). The rotation from the lens rotation shaft driving motor 12 is transmitted through a rotation transmitting means 14 such as a pulley or a toothed belt. The other rotating shaft 4B is provided with a lens presser 15 for pressing the lens 3 to be processed against the lens holder 10 at one end, and the other end is rotatably supported by the other arm 11b of the Y-direction slider 11 to rotate the lens. Similarly, the rotation from the shaft driving motor 12 is transmitted through a rotation transmitting means 16 such as a pulley or a toothed belt. Accordingly, the rotating shafts 4A and 4B are driven in synchronization with the lens 3 to be processed held by the lens holder 10 and the lens presser 15. As the lens rotating shaft driving motor 12, a pulse motor having a variable rotational speed and capable of rotating forward and reverse is used.

  The first lens rotation axis moving mechanism 5 moves in the X direction along a pair of front and rear linear guides 21 that are installed in parallel on the bottom plate 20 of the housing 2 and that is long in the X direction. The X-direction table 22 and an X-direction table drive motor (not shown) for moving the X-direction table 22 along the linear guide 21 are configured.

  The second lens rotation shaft moving mechanism 6 includes a guide plate 25 erected on the X-direction table 22 and a pair of left and right linear guides extending in the Y direction and disposed in parallel with the front surface of the guide plate 25. 26, the Y-direction slider 11 provided on these linear guides 26 so as to be movable up and down, a Y-direction slider drive motor 27 for moving the Y-direction slider 11 along the linear guides 26, and the like. . Since the Y-direction slider 11 is formed in a U shape in plan view, the Y-direction slider 11 integrally has a pair of left and right arm portions 11a and 11b extending forward, and thereby the end portion of the lens rotation shaft 4 is provided. It is pivotally supported. For this reason, the lens rotation shaft 4 is moved and adjusted in two directions of the X direction and the Y direction by the movement of the X direction table 22 and the Y direction slider 11 when the lens 3 is processed, and is driven by the lens rotation shaft driving motor 12. To do. A motor (not shown) that moves the rotating shaft 4B in the X direction is incorporated on the arm portion 11b side so that the lens 3 to be processed can be attached and detached.

  On the upper surface of the bottom plate 20, behind the guide plate 25, a horizontal mounting table 31 is installed by a total of four support columns 32 each consisting of a pair of left and right front and rear, and the processing tool rotating mechanism 7 is mounted thereon. Has been. The processing tool rotating mechanism 7 includes a Z-direction table 34 that is movably provided on a pair of left and right guide rails 33 that are installed in parallel on the mounting table 31 and that extend in the Z direction. And a Z-direction table driving motor 35 that drives in the Z-direction along 33. As shown in FIG. 3, a nut mounting member 36 is fixed to the center of the lower surface of the Z-direction table 34 with screws. The attachment member 36 extends below the mounting table 31, and a cylindrical nut member 37 provided at the lower end is screwed into the screw body 40. The screw body 40 is connected to an output shaft 38 of the Z-direction table driving motor 35 via a coupling 39, and both end portions thereof are rotatably supported by bearings 41, respectively.

  On the Z-direction table 34, a holder 50 for rotatably holding the rotating arm 51 is installed. The holder 50 is formed of a rectangular tube with both ends open, and is installed horizontally with the axis line coincident with the Z direction, and a plurality of bearings 52 that support the rotating arm 51 are incorporated therein. A motor mounting member 53 (FIG. 3) is fixed to the rear end surface of the holder 50, and a processing tool group switching motor 55 for rotating the rotating arm 51 is fixed to the front surface of the upper end portion. . The processing tool group switching motor 55 is rotated via a drive gear 57 provided on the output shaft 56, an intermediate gear 58 provided on the motor attachment member 53, and a driven gear 59 attached to the rear end of the rotary arm 51. The rotation arm 51 is configured to be transmitted.

  The rotating arm 51 is also formed of a cylindrical body and penetrates the holder 50 so as to freely rotate. A holder 61 that rotatably holds the processing tool rotation shaft 70 (FIG. 2) is attached to the front end side of the rotation arm 51 via an attachment member 62. The mounting member 62 is composed of two divided pieces 62a and 62b (FIG. 3) which are formed into two parts on the upper and lower sides and are integrally joined by bolts 63, and through holes 64 (FIG. 2) open on the left and right side surfaces. And a fitting hole 65 (FIG. 3) that opens to the back side. The small diameter portion of the front end side of the rotating arm 51 is fitted into the fitting hole 65 and fixed by a set screw 66 (FIG. 2). Has been.

  The holder 61 is formed of a cylindrical body having both ends open, and is attached through the through hole 64 of the attachment member 62 so that the axis is orthogonal to the axis of the rotating arm 51, and the center in the longitudinal direction is the attachment. It is clamped by the member 62. This clamping force is applied by the tightening force of the bolt 63. An opening 69 that communicates with the through hole 68 of the rotating arm 51 is formed in the center of the back surface of the holder 61.

  The processing tool rotating shaft 70 is rotatably supported by a plurality of bearings 71 in the holder 61, and both end portions protrude from the holder 61 to the outside, and the protruding end portions are the first ends. The 2nd process attachment parts 72 and 73 are comprised, respectively. A first processing tool group 74 is mounted on the first processing tool mounting portion 72, and a second processing tool group 90 is mounted on the second processing tool mounting portion 73. A processing tool for processing the target lens 30 from the circular lens 3 is configured.

  In FIG. 2, the first processing tool group 74 includes a roughing end mill 75 and a primary (finishing) grindstone 76. The end mill 75 is an end mill that is used when a lens-shaped lens (lens lens) 30 (FIG. 7) corresponding to the frame shape of the spectacle frame is punched out from the circular workpiece lens 3, and the processing tool rotates. The shaft 70 is attached to one end surface (the right end surface in FIG. 2). The end mill 75 is formed in a rod-like body having an outer diameter of about 3 to 4 mm.

  The grindstone 76 is a primary (finishing) grindstone and is formed in a substantially conical shape. A primary beveling portion 77 provided on the peripheral surface from the large diameter side to the small diameter side, primary flattening processing. Part 78, a primary convex chamfering part 79 and a primary concave chamfering part 80 are integrally provided, and are attached to the processing tool rotating shaft 70 so that the large diameter part side is the rotating arm 51 side and the small diameter part side is the end mill 75 side. ing.

  The primary beveling portion 77 is provided on the peripheral surface of the large-diameter portion of the grindstone 76, and a V-shaped bevel groove 81 is formed. The primary flattened portion 78 is provided adjacent to the primary beveled portion 77 and forms the same slope as this. The primary convex chamfered portion 79 is provided adjacent to the primary flattened portion 78 and has a larger inclination angle. The primary concave chamfered portion 80 is provided on the front peripheral surface of the grindstone 76 so as to face the primary convex chamfered portion 79. For this reason, the primary convex chamfered portion 79 is formed on an inclined surface whose inclination direction is opposite. A tapered annular groove 83 is formed between the primary convex chamfered portion 79 and the primary concave chamfered portion 80. The groove width of the annular groove 83 is set larger than the maximum edge thickness of the various lens lenses 30 to be processed. The inclination angle of the primary beveling portion 77 and the primary flattening portion 78 is about 10 °. The primary concave chamfered portion 80 has a larger inclination angle than the primary convex chamfered portion 79.

  The second processing tool group 90 includes a drilling end mill 91, a secondary (polishing) grindstone 92, and a grooving cutter 93.

  The end mill 91 is an end mill used when drilling the outer peripheral surface (edge surface) or optical surface of the lens lens 30 attached to the edgeless spectacle frame, and has a thin diameter of about 0.8 mm. It is used and is provided on the other end surface (the left end surface in FIG. 2) of the processing tool rotating shaft 70.

  The grindstone 92 is a grindstone used for secondary (mirror surface) finishing of each part processed by the grindstone 76 of the first processing tool group 74, and is formed in a cone shape substantially the same shape as the grindstone 76. A secondary beveling portion 96, a secondary flattening portion 97, a secondary convex chamfering portion 98 and a secondary concave chamfering portion 98 provided on the outer peripheral surface from the large diameter portion side toward the small diameter portion side. It is prepared as one. Further, the grindstone 92 is attached to the second work tool mounting portion 73 of the tool shaft rotating shaft 70 so that the direction is opposite to that of the grindstone 76 of the first work tool group 74. In the secondary beveling portion 96, a V-shaped bevel groove 100 is formed. The inclination angles of the secondary beveling portion 96 and the secondary flattening portion 97 are equal. The secondary convex chamfered portion 98 and the secondary concave chamfered portion 99 are opposed to each other with the annular groove 105 interposed therebetween, and are formed on inclined surfaces whose inclination directions are opposite to each other.

  Further, the first processing tool group 74 and the second processing tool group 90 are attached symmetrically with respect to the rotation center O of the processing tool rotating shaft 70. The rotation center O of the processing tool rotation shaft 70 is the center when the processing tool rotation shaft 70 is rotated by the rotation arm 51, and is located on the axis of the rotation arm 51. Here, the fact that the first processing tool group 74 and the second processing tool group 90 are symmetrical means that the distances from the rotation center O of the processing tool rotating shaft 70 to the tips of the end mills 75 and 91 are substantially equal. It also means that the directions of the grindstone 76 and the grindstone 92 are opposite and the distance from the rotation center O to the tip is substantially equal. If provided symmetrically in this way, when the first and second processing tool groups 74 and 90 are switched and used, the end mill 75 can be obtained by rotating the rotating arm 51 by 180 ° around its axis. Since the positions of the grindstone 76, the end mill 91, and the grindstone 92 are interchanged, it is not necessary to move and adjust the rotating arm 51 in the X direction each time, and the configuration and control of the processing tool rotating mechanism 7 can be facilitated.

  The grooving cutter 93 is a disk-shaped cutter used for applying a narrow groove to the edge of the lens lens mounted on the nyroll frame, and is provided between the end mill 91 and the grindstone 92. As such a grooving cutter 93, for example, a disk-shaped super steel cutter having a tooth thickness of about 0.6 mm and an outer diameter of about 16 mm and having, for example, 16 sawtooth blades on the outer periphery is used.

  Unlike ordinary eyeglass frames with rims, the Niroll frame holds the upper part of the spectacle lens with an arc-shaped half rim, and the lower part with a high tension thread such as titanium, piano wire, nylon thread, etc. Both ends of the tension yarn are fixed to the half rim. For this reason, it is necessary to form a groove for locking the high tension yarn on the edge surface 30 c of the lens lens 30, and this groove is formed by the groove cutter 93.

  2 and 3, a rotary shaft driving motor 110 that drives the processing tool rotary shaft 70 is attached to the rear end surface of the Z-direction table 34 via a mounting plate 111. A rear end of the rotation transmission shaft 113 is connected to the output shaft 112 of the drive motor 110 via a coupling 114. The rotation transmission shaft 113 passes through the rotation arm 51 and has a tip portion inserted into the holder 61 through the opening 69. The rotation transmission shaft 113 is rotatably supported by a plurality of bearings 115 incorporated in the rotation arm 51, and a driving side bevel gear 116 is fixed to the tip. On the other hand, a driven bevel gear 117 that meshes with the drive side bevel gear 116 is fixed to the processing tool rotating shaft 70. Therefore, when the drive motor 110 is driven, the rotation of the output shaft 112 is transmitted to the work tool rotation shaft 70 via the coupling 114 -the rotation transmission shaft 113 -the drive side bevel gear 116 -the driven side bevel gear 117. As the drive motor 110, a DC motor or a servo motor capable of forward / reverse rotation with a speed controller is used, and the rotation speed is 5,000 to 30,000 rpm, but is switched depending on the processing tool to be used. For example, the cutting process of the lens 3 to be processed by the roughing end mill 75 (drawing process of the lens lens) is 20,000 to 30,000 rpm (dry processing), and primary beveling by the primary grinding stone 76. Flattening processing and chamfering processing (convex surface, concave surface) are 8,000 to 10,000 rpm (wet processing), drilling by the end mill 91 for drilling is 15,000 to 20,000 rpm (dry processing), secondary Secondary beveling, flattening and chamfering (convex surface, concave surface) by a grinding wheel 92 for the purpose is 8,000 to 10,000 rpm (wet processing), and grooving by the grooving cutter 93 is 5,000 to 6 1,000 rpm (dry processing).

FIG. 5 is a diagram showing processing steps by the spectacle lens processing apparatus 1 having the above structure.
First, frame shape data (lens shape data) of eyeglass frames, processing information necessary for processing of the lens lens 30, processing information such as set values, for example, radial information (radial angle, (Radial length), edge thickness, bevel curve, groove curve, lens surface curve, groove position, groove depth, groove width, inclination angle, lens material, grinding amount (groove depth, groove width) per lens rotation, etc. It inputs into the control part of the spectacle lens processing apparatus 1. FIG.

  The processing information and the like can be easily input to the control unit by, for example, data transmission through a communication network line or direct input means such as a touch panel.

  Next, the lens 3 to be processed is mounted on the lens rotation shaft 4 (step S1). In mounting, the convex surface 3a of the lens 3 to be processed is held in advance by the lens holder 10, and the lens holder 10 is attached to one rotating shaft 4A. Then, the other rotating shaft 4B is moved to the lens side to press the lens presser 15 against the concave surface 3b of the lens 3 to be processed with a predetermined pressure, and the lens holder 10 and the lens presser 15 hold the center of the lens 3 to be processed. When preparation for processing is completed in this way, the processing of the lens 3 to be processed is started by operating the start button.

  In the present spectacle lens processing apparatus 1, the first processing tool group 74 includes a roughing end mill 75 that pulls out the lens 30 from the lens 3 to be processed, a primary bevel processing section 77, and primary flattening processing. Part 78, a primary convex chamfering part 79 and a primary concave chamfering part 80, and a grindstone 76 for edging (primary) the target lens 30, and the second processing tool group 90 is a target lens. End mill 91 for drilling the edge 30c or the optical surface of the lens 30, a secondary beveling section 96, a secondary flattening processing section 97, a secondary convex chamfering processing section 98, and a secondary concave chamfering process. Step S2 to Step S are provided with the grindstone 92 that has the portion 99 and rims the lens lens 30 (secondary) and the groove cutter 93 that grooves the edge surface 30c of the lens lens 30. 10 types of lens processing is possible, and by selecting and using these tools, lens processing for general rimmed spectacle frames, lens processing for edgeless spectacle frames, and lens processing for nyroll frames can be performed. Can be done. There are two types of edgeless spectacle frames: a type in which the support pin is driven into the lens optical surface and a type in which the support pin is driven into the edge surface.

FIGS. 6 to 18 show the processing state by each processing tool.
FIG. 6 is a diagram showing a state in which the lens 30 is punched out (step S2 in FIG. 5) by roughing the lens 3 to be processed by the end mill 75, and FIG. FIG.
At the time of processing, the Z direction table 34 is moved in the Z direction by driving the Z direction table driving motor 35, and the processing tool rotating shaft 70 is moved vertically above the lens rotating shaft 4 from the origin position. Further, the working tool rotating shaft 70 is inclined at a required angle with respect to the lens rotating shaft 4 (for example, 10 °) by the rotation of the rotating arm 51. Further, the processing tool rotating shaft 70 is rotated at a high speed by driving the processing tool rotating shaft driving motor 110. When the processing tool rotating shaft 70 is rotated, the first and second processing tool groups 74 and 90 are also rotated integrally therewith. The reason why the processing tool rotating shaft 70 is inclined with respect to the lens rotating shaft 4 is to prevent the grindstone 76 and the holder 61 from interfering with the lens rotating shaft 4 (beveling processing, flattening processing, chamfering described later). The same applies to processing).

  On the other hand, the lens rotating shaft 4 is rotated by driving the lens rotating shaft driving motor 12 and moved in the Y direction according to the frame shape data of the inputted spectacle frame, whereby the outer peripheral surface of the lens 3 to be processed is rotated around the end mill 75. Press against the surface. Further, the rotational speed, vertical movement, and forward / backward movement of the lens rotation shaft 4 are controlled in accordance with the frame shape data. That is, in order to make the peripheral speed of the target lens 30 constant according to the frame shape data, the rotational speed of the lens rotating shaft 4, in other words, the rotational angle (θ) of the lens 3 to be processed is controlled (bevel processing described later). The same applies to flattening and grooving). Further, the movement in the Y direction is controlled so as to obtain a frame shape (the same applies to beveling, flattening, and grooving described later). Further, the movement in the X direction is controlled in accordance with the edge thickness of the lens lens 30 (the same applies to beveling, chamfering, and grooving described later). As a result, the end mill 75 cuts from the outer peripheral surface of the lens 3 to be processed, and the lens 3 to be processed is drawn out into the lens 30 having a lens shape. The drawing process of the lens 30 by the end mill 75 is completed only by rotating the lens rotation shaft 4 approximately 1.5 times. Further, the residue of the lens 3 to be processed from which the target lens 30 is pulled out is easy to process because it is not broken and maintains the original circular shape.

  When the punching process (step S2) of the target lens 30 is finished, the target lens 30 is subjected to a primary beveling process (step S3) or a primary flattening process (step S5) by the grindstone 76 of the first processing tool group 74. That is, as shown in FIG. 5, when processing a lens attached to a rimmed eyeglass frame, primary beveling is performed, and when processing a lens attached to a frameless eyeglass frame and a nyroll frame, primary flattening is performed. Processing.

FIG. 8 is a diagram showing a state where the edge surface of the lens 30 is primarily beveled by the grindstone 76.
During processing, the processing tool rotating shaft 70 is held at a constant height. In addition, a required angle is inclined (about 10 °) so that the primary beveling portion 77 is parallel to the lens rotating shaft 4, and the processing tool rotating shaft 70 is rotated at a high speed by switching the rotating speed to the rotating speed of the grindstone 76. . On the other hand, the lens rotation shaft 4 is moved and adjusted in the X direction so that the lens 30 corresponds to the primary bevel processing section 77 to rotate the lens 30, and in the X and Y directions according to the input frame shape data. And the edge surface is pressed against the primary beveling portion 77. As a result, the bevel groove 81 of the primary bevel processing portion 77 is transferred to the edge surface of the lens 30 and a bevel formed of a V-shaped protrusion is formed.

  Since the grindstone 76 has a small outer diameter and has a conical shape, even a lens having a large lens curve, for example, about 8 curves, may cause beveling due to interference between the grindstone 76 and the bevel. The bevel can be processed and formed satisfactorily.

FIG. 9 is a diagram showing a state where the edge surface of the lens 30 is subjected to primary flattening processing (step S5) by the primary flattening processing portion 78 of the grindstone 76.
The primary flattening processing of the edge surface 30c by the primary flattening processing portion 78 is performed in a state where the processing tool rotation shaft 70 is inclined by approximately 10 ° with respect to the lens rotation shaft 4 in the same manner as the primary beveling processing. The secondary beveling process (step S4) and the secondary flattening process (step S6) will be described later.

FIG. 10 is a view showing a state where the lens lens 30 is subjected to primary convex chamfering processing (step S10) by the grindstone 76.
During processing, the processing tool rotating shaft 70 is held at a constant height. Further, the processing tool rotation shaft 70 is rotated at a high speed by being inclined by about 10 degrees with respect to the lens rotation shaft 4. On the other hand, the lens rotation shaft 4 is moved and adjusted in the X direction so that the lens lens 30 corresponds to the primary convex chamfering processing portion 79 to rotate the lens lens 30 and X, Y according to the input frame shape data. The convex outer peripheral edge 30e is pressed against the primary convex chamfered portion 79 by moving in the direction. As a result, the primary convex chamfered portion 79 chamfers the convex outer peripheral portion 30 e of the target lens 30.

FIG. 11 is a diagram showing a state in which the lens lens 30 is subjected to primary concave chamfering processing by the primary concave chamfering processing unit 80 of the grindstone 76.
In the concave chamfering process (step S11) by the primary concave chamfering part 80, the lens rotation shaft 4 is moved and adjusted in the X direction and the concave outer peripheral part 30f of the lens 30 is pressed against the primary concave chamfering part 80. This is performed in the same manner as the convex chamfering.

  When the primary beveling process or the primary flattening process and the primary chamfering process with the grindstone 74 of the first processing tool group 74 are finished, the secondary beveling process (step S4) or the secondary with the grindstone 92 of the second processing tool group 90 is completed. The flattening process (step S6) and the secondary chamfering process (step S11) are performed in the same manner as the primary process.

FIG. 12 is a diagram showing a state in which the bead lens 30 is subjected to secondary beveling (step S4) by the grindstone 92.
At the time of processing, the rotary arm 51 is rotated 180 ° to reverse the processing tool rotating shaft 70 and the positions of the first and second processing tool groups 74 and 90 are exchanged. When reversing, the lens rotation shaft 4 is retracted in advance downward, the processing tool rotation shaft 70 is reversed on the spot, and then the lens rotation shaft 4 is raised and returned again. Then, the processing tool rotating shaft 70 is rotated. Further, the lens rotation shaft 4 is moved and adjusted in the X direction so that the lens 30 corresponds to the secondary beveling portion 96 of the grindstone 92 to rotate the lens rotation shaft 4 and according to the input frame shape data. The bevel portion formed by the primary beveling of the target lens 30 by moving in the X and Y directions is pressed against the secondary beveling portion 96. As a result, the secondary bevel processing section 96 secondary bevels the bevel of the lens 30.

FIG. 13 is a diagram showing a state in which the edge surface 30c of the target lens 30 is subjected to secondary flattening processing (step S6) by the grindstone 92.
During processing, the processing tool rotating shaft 70 is held at a constant height. Further, the processing tool rotating shaft 70 is rotated by tilting the lens rotating shaft 4 by 10 °. On the other hand, the lens rotation shaft 70 is moved and adjusted in the X direction so that the edge surface 30c of the target lens 30 corresponds to the secondary flattening processing portion 97 of the grindstone 92, and the lens rotation shaft 4 is rotated, and the input frame The edge surface 30c, which is moved in the X and Y directions according to the shape data and subjected to the primary flattening process of the target lens 30, is pressed against the secondary flattening processing part 97. As a result, the secondary flattening portion 97 performs secondary flattening on the edge surface 30c.

FIG. 14 is a diagram showing a state in which the lens lens 30 is subjected to secondary convex chamfering processing (step S11) by the grindstone 92.
During processing, the processing tool rotating shaft 70 is held at a constant height. Further, the working tool rotating shaft 70 is rotated by inclining a required angle (10 °) with respect to the lens rotating shaft 4. On the other hand, the lens rotation shaft 4 is moved and adjusted in the X direction so that the lens 30 corresponds to the secondary convex chamfering portion 98 of the grindstone 92, and the lens rotation shaft 4 is rotated, and according to the input frame shape data. The convex outer peripheral portion 30e of the target lens 30 is pressed against the secondary convex chamfering portion 98 by moving in the X and Y directions. As a result, the secondary convex chamfering portion 98 chamfers the convex outer peripheral portion 30 e of the target lens 30.

FIG. 15 is a view showing a state in which the lens lens 30 is subjected to secondary concave chamfering processing by the secondary concave chamfering processing portion 99 of the grindstone 92.
The secondary concave chamfering process by the secondary concave chamfering part 99 is performed by moving and adjusting the lens rotation shaft 4 in the X direction and pressing the concave outer peripheral part 30f of the target lens 30 against the secondary concave chamfering part 99. This is performed in the same manner as the concave chamfering process.

  When processing a lens to be mounted on an edgeless spectacle frame, drilling (step S7 or S8) for inserting a support pin for supporting the lens is required. Such a drilling process is performed after the secondary flattening process (step S6) and before the primary chamfering process (step S10).

  When processing the lens mounted on the nyroll frame, grooving processing (step S9) is required for the edge surface 30c of the target lens 30. Such grooving is performed after the primary flattening (step S5) or the secondary flattening (step S6) and before the primary chamfering (step S10).

FIG. 16 is a view showing a state in which the target lens 30 is grooved by the grooving cutter 93.
During processing, the processing tool rotating shaft 70 is held at a constant height. Further, the processing tool rotation shaft 70 is rotated by inclining a required angle (10 °) with respect to the lens rotation shaft 4. On the other hand, the lens rotation shaft 4 is moved and adjusted in the X direction so that the target lens 30 corresponds to the groove cutter 93 to rotate the lens rotation shaft 4, and in the X and Y directions according to the input frame shape data. The edge surface 30c of the target lens 30 is moved and pressed against the grooving cutter 93. As a result, the grooving cutter 93 processes a groove for locking the nyroll thread on the edge surface 30 c of the lens lens 30.

FIG. 17 is a view showing a state where the outer peripheral portion of the optical surface of the lens 30 is drilled by the end mill 91.
During processing, the processing tool rotating shaft 70 is held at a constant height. In addition, the processing tool rotation shaft 70 is rotated by inclining a required angle (about 5 °) with respect to the lens rotation shaft 4. On the other hand, the lens rotating shaft 4 is moved up and down to make the punched portion of the lens 30 match the height of the end mill 91. When the lens rotation shaft 4 is moved toward the end mill 91 and the convex optical surface of the lens lens 30 is pressed against the end mill 91, the end mill 91 forms a thin hole in the optical surface of the lens lens 30. This hole is a through hole penetrating from the convex surface to the concave surface.

  In the case of an edgeless eyeglass frame, the edge side edge of the lens is normally supported by two support pins, so this drilling process is performed twice by rotating the lens rotation shaft 4 by an angle corresponding to the pin interval. . Further, when the nose side edge portion of the lens is supported by the two support pins, the lens rotation shaft 4 is rotated by approximately 180 ° to punch the nose side edge portion of the target lens 30 twice. In addition, the drilling process by the end mill 91 is only a primary process, and a secondary process is not performed.

FIG. 18 is a view showing a state where the edge surface 30c of the lens lens 30 is punched by the end mill 91.
In processing, the rotary arm 51 is rotated by a required angle, and the processing tool rotation shaft 70 is inclined at a predetermined angle with respect to the vertical line so that the end mill 91 faces downward. This inclination angle α is substantially equal to the inclination angle of the center line in the thickness direction at the lens periphery. On the other hand, the lens rotation shaft 4 is rotated so that the portion of the edge surface 30 c of the lens 30 that is drilled by the end mill 91 is directly above. Further, the lens rotation shaft 4 is raised to position the target lens 30 directly below the end mill 91. Then, the processing tool rotation shaft 70 is rotated, the lens rotation shaft 4 is moved upward and pressed against the end mill 91, so that the end mill 91 punches the edge surface 30 c of the target lens 30. Also in this case, since the edge surfaces of the ear side and the nose side are normally supported by the two support pins, the lens rotating shaft 4 is rotated by an angle corresponding to the pin interval and drilled twice.

  In the case of a spectacle lens mounted on a spectacle frame with a rim, some lenses only perform primary beveling and primary chamfering, and do not perform secondary beveling and secondary chamfering.

  As described above, the eyeglass lens processing apparatus 1 according to the present invention employs a so-called uniaxial method by attaching the first and second processing tool groups 74 and 90 to each end of one processing tool rotating shaft 70. Therefore, the structure is simple and the number of parts and the manufacturing cost can be reduced. Further, the first and second processing tool groups 74 and 90 are provided symmetrically with respect to the rotation center O of the processing tool rotating shaft 70, and are rotated when the first and second processing tool groups 74 and 90 are switched. By rotating the arm 51 by 180 °, the processing tool rotating shaft 70 is reversed, and the positions of the first and second processing tool groups 74 and 90 are switched. Therefore, the processing tool rotating mechanism 7 is moved in the X direction. It is not necessary to make adjustments, and the amount of movement adjustment in the X direction of the lens rotation shaft 4 is small, so that control of the apparatus can be simplified. Furthermore, since it is not necessary to secure a special retreat position for the unused tool, the apparatus can be reduced in size.

  In the above-described embodiment, an example in which the processing tool rotating mechanism 7 is held at a constant height and the lens rotating shaft 4 is driven and controlled in the X, Y, and Z directions to perform lens processing. Although the present invention is not limited to this, since the movement of the processing tool and the lens is relative, the lens rotation shaft 4 is held at a constant height, and the processing tool rotation mechanism is moved in the X direction, Y direction, and Drive control may be performed in the Z direction.

It is a perspective view of the internal structure which shows one Embodiment of the spectacles lens processing apparatus which concerns on this invention. It is a cross-sectional view of the processing tool rotation mechanism of the processing apparatus. It is a longitudinal cross-sectional view of the processing tool rotation mechanism. It is sectional drawing of a lens rotating shaft. It is a figure which shows a process process. It is a figure which shows the state which is roughing the to-be-processed lens with an end mill. It is a figure which shows the process locus | trajectory of an end mill. It is a figure which shows the state which is carrying out the primary beveling. It is a figure which shows the state currently carrying out the primary flattening process. It is a figure which shows the state which is carrying out the primary convex chamfering process. It is a figure which shows the state which is carrying out the primary concave chamfering process. It is a figure which shows the state currently carrying out secondary beveling. It is a figure which shows the state currently carrying out the secondary flattening process. It is a figure which shows the state which is carrying out the secondary convex chamfering process. It is a figure which shows the state currently carrying out the secondary concave chamfering process. It is a figure which shows the state currently grooved. It is a figure which shows the state which is drilling the optical surface. It is a figure which shows the state which is punching the edge surface.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Eyeglass lens processing apparatus, 3 ... Lens to be processed, 4 ... Lens rotating shaft, 5 ... 1st lens rotating shaft moving mechanism, 6 ... 2nd lens rotating shaft moving mechanism, 7 ... Processing tool rotating mechanism, 12 ... Motor: 30 ... Lens lens, 51 ... Rotating arm, 55 ... Motor, 74 ... First processing tool group, 75 ... End mill, 76 ... Grinding stone, 77 ... Primary beveling portion, 78 ... Primary flattening processing portion, 79: Primary convex chamfering portion, 80 ... Primary concave chamfering portion, 90 ... Second processing tool group, 91 ... End mill, 92 ... Grinding stone, 93 ... Groove cutter, 96 ... Secondary beveling portion, 97 ... Two Next flattening processing part, 98 ... Secondary convex chamfering part, 99 ... Secondary concave chamfering part, 110 ... Motor.

Claims (5)

A spectacle lens processing apparatus that manufactures a lens lens corresponding to the frame shape of the spectacle frame by edging and punching a circular workpiece lens,
A lens rotation shaft for holding the lens to be processed;
A lens rotating shaft driving motor for rotating the lens rotating shaft;
A processing tool rotating shaft provided corresponding to the lens rotating shaft;
A processing tool comprising a first processing tool group attached to one end side of the processing tool rotating shaft and a second processing tool group attached to the other end side;
A rotating arm for holding the processing tool rotating shaft;
A processing tool rotating shaft driving motor for rotating the processing tool rotating shaft;
A processing tool group switching motor for rotating the rotation arm by a required angle around its axis when switching between the first and second processing tool groups;
An eyeglass lens processing apparatus comprising: The eyeglass lens processing apparatus according to claim 1,
The first and second processing tool groups each include an end mill and a grindstone, and are arranged symmetrically with respect to the rotation center of the processing tool rotation shaft. In the eyeglass lens processing apparatus according to claim 2,
The end mill of the first processing tool group is a roughing end mill that draws out a lens from a lens to be processed. A spectacle lens processing apparatus comprising a chamfered processing unit integrally. In the eyeglass lens processing apparatus according to claim 2,
The end mill of the second processing tool group is a drilling end mill for drilling the edge surface or lens surface of the lens lens as necessary, and the grindstone is a secondary beveling portion, a secondary flattening portion, A spectacle lens processing apparatus comprising a secondary convex chamfering portion and a secondary concave chamfering portion integrally. In the spectacle lens processing apparatus according to claim 2 or 4,
An eyeglass lens processing apparatus, wherein the second processing tool group is further provided with a grooving cutter for grooving the edge surface of the target lens.

Images