JP2017164897A - Spectacle lens processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spectacle lens grinding processing device for arithmetically operating processing control data for reducing the problems such as a variation by a processing part of a chamfering width, lens-edge thinning by processing interference when processing a lens-edge and the partial expansion of a groove width in ditch excavation processing.SOLUTION: A spectacle lens grinding processing device executes chamfering processing control by adding a chamfering grindstone biting-in quantity of becoming maximum at a peripheral ball type shape point adjacent to a processing control point, to a control quantity in the axial direction of the lens rotational axis, when assuming a contact state between a nonuniform edge end part of a spectacle lens MLF and a chamfering grindstone 38a of a ball type shape upper processing control point, and also similarly executes lens-edge processing control by adding a maximum lens-edge grindstone biting-in quantity of a lens surface side inclined plane and a lens reverse surface side inclined plane of a lens-edge at a peripheral ball type shape point adjacent to a lens-edge processing control point, to a control quantity in the inter-axial distance direction between the lens rotational axis and the grindstone rotational axis.SELECTED DRAWING: Figure 19

Description

  The present invention relates to a spectacle lens grinding apparatus capable of performing from rough grinding processing to chamfering of a peripheral edge of a spectacle lens with a tapered grinding wheel.

Conventionally, as a device for grinding the peripheral edge of the spectacle lens, the peripheral edge of the spectacle lens held on the lens rotation shaft is roughly ground with a tapered grinding wheel, and a chamfering grindstone portion provided on the tapered grinding wheel 2. Description of the Related Art A spectacle lens grinding apparatus capable of chamfering with a lens is known (for example, see Patent Documents 1 and 2).

The lens shape of the spectacle lens to be ground in such a spectacle lens grinding apparatus is such that the distance from the distance between the geometric center of the spectacle frame or the geometric center of the spectacle lens to the peripheral edge depends on the rotation angle θi in the circumferential direction. Generally, the moving radius ρi is determined by a target lens shape measuring device. The data of the rotation angle θi and the moving radius ρi are used as the lens shape data (θi, ρi) for grinding the peripheral shape of the spectacle lens by the spectacle lens grinding apparatus.

On the other hand, in the conventional spectacle lens grinding apparatus, the inter-axis distance Li between the lens rotation axis and the grinding wheel is obtained from the lens shape data (θi, ρi) and the radius of the grinding wheel, and the inter-axis distance Li with respect to the rotation angle θi. Is set to the distance data (θi, Li) between the axes, and the lens rotation axis is integrally driven with the spectacle lens based on the distance data (θi, Li). In addition to grinding the periphery of the lens into a target lens shape based on target lens shape data (θi, ρi), the lens in the axial direction of the lens rotation axis is used to perform processing such as beveling, grooving, and chamfering, which are the desired finished states. In general, grinding is performed while controlling the correlation distance between the grinding wheel and the grinding wheel.

US Patent No. 7,803,035

U.S. Pat. No. 4,928,439

However, in the spectacle lens grinding apparatus using the above-described tapered grinding wheel, the chamfering width varies depending on the machining part, the bevel becomes thin due to machining interference during the beveling process, the groove width partially expands in the grooving process, etc. This problem is reduced as an effect of the tapered grinding wheel, but there is a generation amount that is recognized as a problem depending on conditions.

Therefore, the present invention eliminates or reduces the occurrence of problems such as fluctuations in the chamfer width depending on the machining site, beveling due to machining interference during beveling, and partial expansion of the groove width during grooving. An object of the present invention is to provide an eyeglass lens processing apparatus capable of calculating control data.

In order to achieve this object, the present invention provides a lens rotation shaft that is provided so as to be able to hold a spectacle lens and that can be moved and controlled by a Z-axis direction drive motor in the Z-axis direction, which is the lens axis direction, and the spectacle lens. Based on the target lens shape data (θi, ρi) and the radius of the grindstone that grinds the periphery of the spectacle lens, the inter-axis distance Li between the lens rotation axis and the grindstone rotation axis of the grinding wheel is determined as the target lens shape. Calculation is made for each moving radius ρi of the shape data (θi, ρi) to obtain the interaxial distance data (θi, Li) composed of the interaxial distance Li and the rotation angle θi, and the interaxial distance data (θi, Li). ) To control the lens axis rotation driving means to rotate the lens rotation axis for each rotation angle θi, and to control the axis distance adjustment means based on the axis distance data (θi, Li). Rotate the inter-axis distance Li And it is adapted to adjust to each θi. Further, the calculation control means is a chamfering grindstone at a peripheral bead shape point adjacent to the processing control point when assuming a contact state with the chamfering grindstone at the end of the spectacle lens edge at the processing control point on the target lens shape. It is characterized by calculating the amount of biting and controlling chamfering with a control amount that adds the biting amount at the peripheral target lens shape point where the biting amount is maximum to the axial control amount of the lens rotation axis. To do.

The present invention also provides a lens rotation shaft provided so as to be capable of holding a spectacle lens and capable of being moved and controlled by a Z-axis direction drive motor in the Z-axis direction, which is the lens axis direction, and the lens shape data of the spectacle lens. Based on (θi, ρi) and the radius of the grindstone that grinds the periphery of the spectacle lens, the inter-axis distance Li between the lens rotation axis and the grindstone rotation axis of the grinding wheel is determined as the lens shape data (θi, ρi) is calculated for each moving radius ρi to obtain the interaxial distance data (θi, Li) composed of the interaxial distance Li and the rotation angle θi, and the lens axis based on the interaxial distance data (θi, Li). The rotation drive means is controlled to rotate the lens rotation axis for each rotation angle θi, and the axis distance adjustment means is controlled based on the axis distance data (θi, Li) to control the axis distance Li. Adjust for each rotation angle θi Arithmetic control means is provided. The grinding wheel has an outer peripheral surface formed in a taper shape, and the wheel rotation shaft has the lens rotation shaft such that a ridge line on the lens rotation shaft side of the grinding wheel is parallel to the axis of the lens rotation shaft. It is in a state where it is inclined by a grindstone inclination angle ξ with respect to an axis parallel to the axis. The calculation control means includes a bevel lens surface side inclined surface and a lens back surface side at a peripheral lens shape point adjacent to the processing control point when assuming a contact state with the bevel grindstone of the processing control point on the target lens shape. The amount of bite whetstone biting on each inclined surface was calculated, and the biting amount at the peripheral lens shape point where the biting amount was the maximum was added to the distance control amount between the lens rotation axis and the wheel rotation axis. It is characterized by controlling the beveling with a control amount.

The present invention also provides a lens rotation shaft provided so as to be capable of holding a spectacle lens and capable of being moved and controlled by a Z-axis direction drive motor in the Z-axis direction, which is the lens axis direction, and the lens shape data of the spectacle lens. Based on (θi, ρi) and the radius of the grindstone that grinds the periphery of the spectacle lens, the inter-axis distance Li between the lens rotation axis and the grindstone rotation axis of the grinding wheel is determined as the lens shape data (θi, ρi) is calculated for each moving radius ρi to obtain the interaxial distance data (θi, Li) composed of the interaxial distance Li and the rotation angle θi, and the lens axis based on the interaxial distance data (θi, Li). The rotation drive means is controlled to rotate the lens rotation axis for each rotation angle θi, and the axis distance adjustment means is controlled based on the axis distance data (θi, Li) to control the axis distance Li. Adjust for each rotation angle θi Computation control means is provided, and the grinding wheel has an outer peripheral surface tapered, and the grinding wheel rotation shaft has a ridge line on the lens rotation shaft side of the grinding wheel parallel to the axis of the lens rotation shaft. As described above, the wheel is inclined by the grindstone inclination angle ξ with respect to the axis parallel to the axis of the lens rotation axis. A grindstone for grooving, the grindstone width of which is smaller than a desired groove width, is mounted on the grindstone rotating shaft. The calculation control means is based on the control for processing the lens surface side groove surface, and the peripheral target lens shape adjacent to the processing control point when assuming the contact state with the groove grindstone of the target lens shape upper groove processing control point. Calculate the biting amount of the groove grindstone at the point, find the biting amount at the peripheral lens shape point where the biting amount is the maximum as the front side maximum biting amount, and similarly for the lens back side groove surface, The control amount in the direction parallel to the lens axis for processing the lens surface side groove surface of the above groove is obtained as the back side maximum bite amount at the peripheral lens shape point where the bite amount is maximum Control of processing the lens surface side groove surface with a control amount obtained by adding the front side maximum bite amount to the front side and the back side maximum bite amount in the control amount in the direction parallel to the lens axis for processing the lens back side groove surface of the groove With the control amount plus Which comprises carrying out the control for processing.

  Further, in the present invention, after the calculation control means obtains the front side maximum bite amount and the back side maximum bite amount, the sum of the front side maximum bite amount and the back side maximum bite amount is a specific value. When the lens processing control angle position is larger than the difference between the target groove width and the thickness of the grooved grindstone, the maximum bite amount on the front side is equal to the difference between the target groove width and the thickness of the grooved grindstone, and After the back side maximum bite amount is reduced, the lens surface side groove surface is processed with a control amount obtained by adding the front side maximum bite amount to the control amount in the direction parallel to the lens axis for processing the lens surface side groove surface of the groove. And control for processing the lens back side groove surface with a control amount obtained by adding the back side maximum biting amount to the control amount in the direction parallel to the lens axis for processing the lens back side groove surface of the groove. It is characterized by.

According to this structure, it can process, without generating the biting at the time of the chamfering process which generate | occur | produces with a frame shape and a lens curve. In addition, the beveling can be performed to a desired accurate shape that does not cause the beveling stone to bite by the beveling curve and the beveling curve. Moreover, the expansion of the bevel groove width resulting from the biting of the groove grindstone generated by the frame shape and the groove curve at the time of grooving can be reduced. Further, it is possible to prevent the occurrence of biting into the reverse surface due to the purpose of reducing the groove width.

1 is a schematic perspective view showing the relationship between a spectacle lens grinding apparatus and a mold shape measuring apparatus according to the present invention. (A) is explanatory drawing of the operation panel of the spectacle lens grinding apparatus shown in FIG. 1, (B) is explanatory drawing of the liquid crystal display of the spectacle lens grinding apparatus shown in FIG. FIG. 2 is a partial perspective view of a processing chamber of the spectacle lens grinding apparatus shown in FIG. 1. It is sectional drawing which follows the AA line of FIG. It is a perspective view which shows the drive mechanism of the carriage which supports the process chamber and lens rotating shaft shown in FIG. It is explanatory drawing which shows the relationship between the lens rotating shaft shown in FIG. 5, and a grinding wheel. FIG. 6 is a perspective view showing a drive mechanism of the carriage shown in FIG. 5. FIG. 6 is an explanatory diagram of an inter-axis distance adjusting unit that drives the lens rotation shaft shown in FIG. 5 up and down. It is a control circuit diagram of the spectacle lens grinding apparatus shown in FIG. It is explanatory drawing which shows the state which made the periphery of the spectacle lens shown in FIG. 8 contact the rough grinding wheel. It is explanatory drawing which looked at the spectacle lens and grinding wheel of FIG. 10 from arrow A1 direction. It is explanatory drawing which shows the state which made the grindstone rotating shaft horizontal in the state which contacted the periphery of the spectacle lens shown in FIG. 8 with the rough grinding grindstone. It is explanatory drawing which looked at the spectacle lens and grinding wheel of FIG. 12 from arrow A2. It is explanatory drawing which shows the shape of the spectacle lens and the grinding wheel seen from the arrow A1 direction of FIG. It is explanatory drawing which calculates | requires the distance between axes at the time of forming the spectacle lens of FIG. 14 in a target lens shape. It is explanatory drawing which shows the shape of the spectacle lens and the grinding wheel seen from the arrow A2 direction of FIG. It is explanatory drawing which calculates | requires the distance between axes at the time of forming the spectacle lens of FIG. 16 in a target lens shape. 10 shows the relationship between the grinding wheel at the rotation start position where the rotation angle θi of the spectacle lens is θ0 and the lens shape of the spectacle lens ground by the grinding wheel, and (a) shows the grinding wheel from the direction of arrow A1 in FIG. It is a schematic diagram of the distance between axes with a spectacle lens, (b) is a schematic diagram for demonstrating the distance between axes of a grinding stone and the spectacle lens seen from the arrow A2 direction of FIG. FIG. 19 is a schematic diagram illustrating in more detail the interaxial distance relationship between (a) and (b) of FIG. 18 when the spectacle lens of FIG. 18 is rotated θi from the rotation start position. FIG. 19B is a schematic diagram illustrating in more detail the interaxial distance relationship between FIGS. 18A and 18B when the spectacle lens of FIG. 18A is further rotated. FIG. 18B is a schematic diagram illustrating in more detail the interaxial distance relationship between (a) and (b) of FIG. 18 when the spectacle lens is further rotated. FIG. 19 is a schematic diagram illustrating in more detail the interaxial distance relationship between FIGS. 18A and 18B when the spectacle lens of FIG. 18 is rotated 90 ° from the rotation start position. (A) is a schematic diagram of a spectacle lens whose periphery is formed into a target shape by the rough grinding wheel of FIG. 6, and (b) is spectacles by the spectacle lens of (a) and the chamfering grindstone portion of the grinding wheel in FIG. Explanatory drawing of the chamfering conditions for chamfering a lens periphery, (c) is sectional drawing of (i)-(vii) of (b). FIG. 2 is a plan view of a spectacle lens formed in a bead shape with a bevel in contact with a bevel grinding wheel according to the present invention. It is a front view in which a spectacle lens formed in a bead shape with a bevel is in contact with a grinding wheel for bevels according to the present invention. It is sectional drawing of (i) (ii) (iv) (vi) (vii) which passes along the center of the grindstone shaft for a bevel. This shows a state where interference is not removed. It is sectional drawing of (ii) (iv) (vi) which passes along the center of the grindstone axis for bevels. The state after interference cancellation is shown. It is a top view which shows the detailed contact state of the spectacle lens in which the bevel was formed, and the bevel grindstone. A state where interference is not removed and a state where interference is removed are shown. It is a top view in which the spectacles lens formed in the shape of the lens which was grooving is in contact with the grooving grindstone according to the present invention. It is a front view in which the spectacle lens formed in the shape of the target lens shape that has been grooving is in contact with the grooving grindstone according to the present invention. It is sectional drawing which shows the interrelationship of a spectacle lens, a nylon thread | yarn, and a grooving grindstone. It is sectional drawing of (i)-(v) which passes along the center of a grooving grindstone axis. This shows a state where interference is not removed. It is sectional drawing of (i)-(v) which passes along the center of a grooving grindstone axis. A state in which interference removal on the lens surface side is performed with a grooving grindstone having a thickness smaller than the groove width is shown. It is sectional drawing of (i)-(v) which passes along the center of a grooving grindstone axis. The state where the interference removal on the back side of the lens is removed with a grooving grindstone having a thickness smaller than the groove width is shown. It is sectional drawing of the grinding wheel which shows the other Example of the spectacles lens grinding apparatus which concerns on this invention. It is explanatory drawing which shows the Example which provided the drill for drilling in the grinding wheel of the spectacle lens grinding processing apparatus which concerns on this invention. It is explanatory drawing of the rotational drive mechanism which rotationally drives the grindstone rotating shaft of the grinding wheel of FIG. It is explanatory drawing of the inclination mechanism which adjusts inclination of the grindstone rotating shaft of the grinding wheel of FIG. FIG. 8 is an explanatory view showing another embodiment of the carriage and lens rotation shaft of FIG. 7. FIG. 27 is an explanatory diagram of drilling showing the relationship between the spectacle lens of FIG. 26 and the drill of the grinding wheel of FIG. 22. It is a schematic diagram for calculating | requiring the grooving condition to the spectacle lens by the grooving grindstone shown in FIG. It is a schematic diagram which shows the relationship between the ditching grindstone of FIG. 28, and the edge surface of a spectacle lens. It is a schematic diagram which calculates | requires the process position of the spectacle lens of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Constitution]
Referring to FIG. 1, a spectacle lens grinding apparatus according to the present invention is shown.
In FIG. 1, reference numeral 1 denotes lens shape data (θi, ρi) [I = 0, 1, 2,..., Which is lens shape information from the lens frame shape of the spectacle frame F, its template, or a lens model (demo lens). A lens shape data measuring device (frame shape measuring device) for reading n], 2 is a spectacle lens (from a fabric lens or the like based on the lens shape data of the spectacle frame input from the lens shape measuring device 1 by transmission or the like) This is a lens grinding device (ball grinder) that grinds ML (including a rimless lens). In addition, since a well-known thing can be used for the target lens shape measuring apparatus 1, description of the detailed structure, data measurement method, etc. is abbreviate | omitted.

<Lens grinding device 2>
As shown in FIG. 1, an upper surface (inclined surface) 3a that is inclined toward the front side of the apparatus body 3 is provided on the upper portion of the lens grinding apparatus 2, and at the front side (lower side) of the upper surface 3a. An opening processing chamber 4 is formed. The processing chamber 4 is opened and closed by a cover 5 attached to the apparatus body 3 so as to be slidable obliquely up and down.
An operation panel 6 (see FIG. 2A) positioned on the side of the processing chamber 4 and an operation panel 7 positioned on the rear side of the upper opening of the processing chamber 4 are provided on the upper surface 3 a of the apparatus body 3. (Refer to FIG. 2B), and a liquid crystal display 8 that is located behind the lower side of the operation panel 7 and that displays the operation state of the operation panels 6 and 7 is provided.

Further, in the apparatus main body 3, as shown in FIGS. 3 and 5, a grinding part 10 having a processing chamber 4 is provided. The processing chamber 4 is formed in a peripheral wall 11 fixed to the grinding portion 10. As shown in FIGS. 3 and 5, the peripheral wall 11 includes left and right side walls 11a and 11b, a rear wall 11c, a front wall 11d, and a bottom wall 11e. Moreover, arcuate guide slits 11a1 and 11b1 are formed in the side walls 11a and 11b (see FIGS. 3 and 4). Further, as shown in FIG. 3, the bottom wall 11e includes an arc-shaped bottom wall (inclined bottom wall) 11e1 extending in an arc shape downward from the rear wall 11c and a front wall extending from the front lower end of the arc-shaped bottom wall 11e1. It has a lower bottom wall 11e2 extending to 11d. The lower bottom wall 11e2 is provided with a drain pipe (not shown) extending close to the arc-shaped bottom wall 11e1 and extending to a lower waste liquid tank (not shown).
(Cover 5)
The cover 5 is composed of a single glass or resin panel that is colorless and transparent or colored and transparent (for example, colored and transparent such as gray), and slides forward and backward of the apparatus body 3.

(Operation panel 6)
As shown in FIG. 2A, the operation panel 6 includes a “clamp” switch 6a for clamping the spectacle lens ML with a pair of lens rotation shafts 23 and 24, which will be described later, and the right and left for the spectacle lens ML. “Left” switch 6b and “right” switch 6c for designating eye processing and display switching, “grinding wheel movement” switches 6d and 6e for moving the grindstone in the horizontal direction, and finishing processing of the spectacle lens ML “Refinish / Trial” switch 6f for refinishing or trial sliding when insufficient or trial sliding, “lens rotation” switch 6g for lens rotation mode, and “stop” for stop mode And a switch 6h.

(Operation panel 7)
As shown in FIG. 2B, the operation panel 7 includes a “screen” switch 7a for switching the display state of the liquid crystal display 8, and a “memory” switch for storing settings relating to processing displayed on the liquid crystal display 8. 7b, a “data request” switch 7c for capturing the target lens shape data (θi, ρi), and a seesaw type “− +” switch 7d (“−” switch and “+” switch used for numerical correction) And a “▽” switch 7e for moving the cursor-type pointer is disposed on the side of the liquid crystal display 8. In addition, function keys F1 to F6 are arranged below the liquid crystal display 8.

The function keys F1 to F6 are used for setting for processing of the eyeglass lens ML, and for responding to and selecting messages displayed on the liquid crystal display 8 in the processing process.
The function keys F1 to F6 are set for processing (layout screen). The function key F1 is used for inputting the lens type, the function key F2 is used for inputting the processing course, the function key F3 is used for inputting the lens material, and the function key F4 is used. The frame type input, function key F5 is used for chamfering type input, and function key F6 is used for mirror finishing input.

Lens types input with the function key F1 include “single focal point”, “ophthalmic prescription”, “progressive”, “bifocal”, “cataract”, “plum”, “8 curve”, and the like. In the spectacles industry, “cataract” generally means a positive lens having a large refractive power, and “bottle” means a negative lens having a large refractive power.
Processing courses input with the function key F2 include “auto”, “trial”, “monitor”, “frame change”, and the like.
The material of the lens to be processed that is input with the function key F3 includes “plastic”, “high index”, “glass”, “polycarbonate”, “acrylic”, and the like.
The types of eyeglass frames F that can be input with the function key F4 are “metal”, “cell”, “optil”, “flat”, “groove (thin)”, “groove (medium)”, “groove”. (Thick) ”etc. Each “grooving” indicates a bevel groove which is a kind of beveling.
Types of chamfering processing input with the function key F5 include “None”, “Small”, “Medium”, “Large”, “Special” and the like.
Examples of the mirror finishing input with the function key F6 include “none”, “present”, “mirror chamfering”, and the like.
The mode, type, or order of the function keys F1 to F6 described above is not particularly limited. In addition, as the selection of each tab TB1 to TB4 to be described later, the number of keys is not limited, such as providing function keys for selecting “layout”, “processing”, “processed”, “menu”, etc. Absent.

(Liquid crystal display 8)
The liquid crystal display 8 is switched by a “layout” tab TB1, a “processing” tab TB2, a “processed” tab TB3, and a “menu” tab TB4, and below the function display section H1 corresponding to the function keys F1 to F6. ~ H6. Note that the colors of the tabs TB1 to TB4 are independent, and the background background except for the areas E1 to E4, which will be described later, is the same background color as the tabs TB1 to TB4 simultaneously with the selection switching of the tabs TB1 to TB4. Switch.
For example, the “display” tab TB1 and the entire display screen (background) with the tab TB1 are blue, the “processing” tab TB2 and the entire display screen (background) with the tab TB2 are green, The tab TB3 and the entire display screen (background) with the tab TB3 are displayed in red, and the menu screen TB4 and the entire display screen (background) with the tab TB4 are displayed in yellow.
In this way, the tabs TB1 to TB4 color-coded for each work and the surrounding background are displayed in the same color, so that the worker can easily recognize or confirm which work is currently being performed. .

The function display sections H1 to H6 are appropriately displayed as necessary, and when they are in the non-display state, display different symbols, numerical values, or states from those corresponding to the functions of the function keys F1 to F6. Can do.
Further, when the function keys F1 to F6 are operated, for example, when the function key F1 is operated, the display of the mode or the like may be switched every time the function key F1 is clicked. For example, a list of each mode corresponding to the function key F1 can be displayed (pop-up display) to improve the selection operation. The list displayed in the pop-up display is represented by characters, figures, icons, or the like.
When the “Layout” tab TB1, the “Processing” tab TB2, and the “Processed” tab TB3 are selected, they are divided into an icon display area E1, a message display area E2, a numerical value display area E3, and a status display area E4. Is displayed. When the “menu” tab TB4 is selected, it is displayed as one menu display area as a whole. When the “Layout” tab TB1 is selected, the “Processing” tab TB2 and the “Processed” tab TB3 may not be displayed and may be displayed when the layout setting is completed.
The layout setting using the liquid crystal display 8 as described above is the same as that in Japanese Patent Application No. 2000-287040 or Japanese Patent Application No. 2000-290864, and thus detailed description thereof is omitted.

<Grinding part 10>
The grinding unit 10 includes a fixed tray 12 shown in FIG. 5 provided in the apparatus main body 3 shown in FIG. 1, a base 13 disposed on the tray 12, a base drive motor 14 fixed to the tray 12, As shown in FIG. 7, a screw shaft 15 interlocked with an output shaft (not shown) of a base drive motor (Z-axis direction drive motor) 14 whose tip is rotatably supported by a support portion 12a raised from the tray 12; It has. The grinding unit 10 includes a rotation driving system 16 for the spectacle lens ML, a grinding means 17 for the spectacle lens ML, and an edge thickness measuring system (edge thickness measuring means) 18 for the spectacle lens ML.

(Base 13)
As shown in FIG. 7, the base 13 is substantially V from a rear support portion 13a extending left and right along the rear edge of the tray 12, and a side support portion 13b extending from the left end of the rear support portion 13a to the front side. It is formed in a letter shape. V block-shaped shaft support portions 13c and 13d are fixed on both left and right ends of the rear support portion 13a, and a V block-shaped shaft support protrusion 13e is fixed on the front end portion of the side support portion 13b. Has been.
In the apparatus main body 3, a pair of parallel guide bars 19 and 20 extending in the left-right direction and arranged in parallel in the front-rear direction are disposed. The left and right ends of the parallel guide bars 19 and 20 are attached to the left and right portions in the apparatus main body 3. In addition, the side guide portions 13b of the base 13 are pivotally supported by the parallel guide bars 19 and 20 so as to be movable back and forth in the left and right directions along the axial direction.

Further, both end portions of the carriage turning shaft 21 extending in the left-right direction are disposed in the V-groove portions on the shaft support portions 13c and 13d. A carriage 22 is attached to the carriage turning shaft 21. The carriage 22 is provided in a continuous manner between the left and right shaft mounting arm portions 22a and 22b that are spaced apart from each other and extend in the front-rear direction and the rear end portions of the arm portions 22a and 22b that extend in the left-right direction. It is formed in a bifurcated shape from a portion 22c and a support protrusion 22d protruding rearward from the left and right center of the connecting portion 22c. The arm portions 22a and 22b and the connecting portion 22c are U-shaped. A peripheral wall 11 that forms the processing chamber 4 is disposed between the arm portions 22a and 22b.
The carriage turning shaft 21 passes through the support protrusion 22d and is held by the support protrusion 22d, and is rotatable with respect to the shaft support portions 13c and 13d. Thereby, the front end side of the carriage 22 can be turned up and down around the carriage turning shaft 21. The carriage turning shaft 21 may be fixed to the shaft support portions 13c and 13d, and the support protrusion 22d may be held so as to be rotatable with respect to the carriage turning shaft 21 and not movable in the axial direction.

  The carriage 22 includes a pair of lens rotation shafts (lens shafts) 23 and 24 that extend from side to side and sandwich a spectacle lens (circular unprocessed spectacle lens, that is, circular processed lens material) ML on the same axis. . The lens rotation shaft 23 penetrates the distal end portion of the arm portion 22a toward the left and right, and is held at the distal end portion of the arm portion 22a so as to be rotatable about the axis and immovable in the axial direction. Further, the lens rotation shaft 24 penetrates the distal end portion of the arm portion 22b toward the left and right, and is held at the distal end portion of the arm portion 22b so as to be rotatable about the axis and adjustable in the axial direction. Since this structure employs a well-known structure, a detailed description thereof will be omitted.

  Further, a guide portion 13f is formed integrally with the base 13, and a screw shaft (feed screw) 15 is screwed to the guide portion 13f. Then, by operating the base drive motor 14 and rotationally driving the screw shaft 15 with the base drive motor 14, the guide portion 13f is moved forward and backward in the axial direction of the screw shaft 15, and the base 13 is integrated with the guide portion 13f. It is supposed to move. At this time, the base 13 is guided by the pair of parallel guide bars 19 and 20 and displaced along the axial direction.

[Carriage 22]
The above-described guide slits 11 a 1 and 11 b 1 of the peripheral wall 11 are formed in an arc shape around the carriage turning shaft 21. End portions of the lens rotation shafts 23 and 24 held by the carriage 22 are inserted into the guide slits 11a1 and 11b1. As a result, the opposite ends of the lens rotation shafts 23 and 24 protrude into the processing chamber 4 surrounded by the peripheral wall 11.
Further, a guide plate P1 having an arc shape and a sectional hat shape is attached to the inner wall surface of the side wall 11a as shown in FIG. 3, and an arc shape and a sectional hat shape are formed on the inner wall surface of the sidewall 11b as shown in FIG. The guide plate P2 is attached. The guide plates P1, P2 are formed with guide slits 11a2 ', 11b2' extending in an arc shape corresponding to the guide slits 11a1, 11b1.

A cover plate 11a2 that closes the guide slits 11a1 and 11a2 'is disposed between the side wall 11a and the guide plate P1 so as to be movable back and forth and up and down. A cover plate 11b2 that closes the slits 11b1 and 11b2 'is arranged to be movable back and forth and up and down. The lens rotation shafts 23 and 24 penetrate the cover plates 11a2 and 11b2 slidably. Accordingly, the cover plates 11a2 and 11b2 are attached to the lens rotation shafts 23 and 24 so as to be relatively movable in the axial direction.
Moreover, the guide plate P1 is provided with arcuate guide rails Ga and Gb that are positioned above and below the guide slits 11a1 and 11a2 ′ and along the upper and lower edges of the guide slits 11a1 and 11a2 ′, and the guide plate P2 has the guide slit 11b1. , 11b2 ′ are provided with arcuate guide rails Gc, Gd along the upper and lower edges of the guide slits 11b1, 11b2 ′, and the cover plate 11a2 is guided up and down by the guide rails Ga, Gb in an arcuate shape. It can be moved up and down. The cover plate 11b2 is guided up and down by the guide rails Gc and Gd and can move up and down in an arc shape.

The lens rotation shaft 23 of the carriage 22 slidably passes through the arc-shaped cover plate 11 a 2 to improve the assembly of the lens rotation shaft 23, the side wall 11 a, the guide plate P 1 and the cover plate 11 a 2, and the lens rotation of the carriage 22. The shaft 24 slidably penetrates the arc-shaped cover plate 11b2 to improve the assembling property of the lens rotating shaft 24, the side wall 11b, the guide plate P2, and the cover plate 11b2.
Further, the space between the cover plate 11a2 and the lens rotation shaft 23 is sealed via a seal member Sa, and the cover plate 11a2 is held on the lens rotation shaft 23 via seal members Sa and Sa. Further, the space between the cover plate 11b2 and the lens rotation shaft 24 is sealed through a seal member Sb, and the cover plate 11b2 is relatively movable in the axial direction with respect to the lens rotation shaft 24 through the seal members Sb and Sb. Is retained. As a result, when the lens rotation shafts 23 and 24 are pivoted up and down along the guide slits 11 a 1, 11 a 2 ′ and 11 b 1, 11 b 2 ′, the cover plates 11 a 2 and 11 b 2 are also moved up and down integrally with the lens rotation shafts 23 and 24. I can move.

The seal member Sa is held on the cover plate 11a2, or the peripheral portion is disposed between the cover plate 11a2 and the side wall 11a and between the cover plate 11a2 and the guide plate P1, so that the lens rotation shaft 23 is provided. When the lens moves in the axial direction, it may not move in the axial direction of the lens rotation shaft 23. Similarly, the seal member Sb is held on the cover plate 11b2, or the peripheral edge portion is disposed between the cover plate 11b2 and the side wall 11b and between the cover plate 11b2 and the guide plate P2, thereby rotating the lens. When the shaft 24 moves in the axial direction, it may be prevented from moving in the axial direction of the lens rotation shaft 24.
The side wall 11a and the guide plate P1 are close to each other so as to be in close contact with the arc-shaped cover plate 11a2, and the side wall 11b and the guide plate P2 are close to each other so that the arc-shaped cover plate 11b2 is in close contact.

Further, the guide plates P1 and P2 in the processing chamber 4 extend to the vicinity of the rear wall 11c and the lower bottom wall 11e2, and the upper and lower ends are near the side of the measuring element (feeler) 41 and the upper vicinity of the grinding wheel 35. By cutting around, the upper and lower ends of the guide plates P1 and P2 are opened in the processing chamber 4 so that the grinding fluid flows along the inner surfaces of the side walls 11a and 11b. The grinding liquid does not collect between the plate P1 and between the side wall 11b and the guide plate P2.
When the carriage 22 is rotated up and down around the carriage turning shaft 21 and the lens rotation shafts 23 and 24 are moved up and down along the guide slits 11a1 and 11b1, the cover plates 11a2 and 11b2 are also integrated with the lens rotation shafts 23 and 24. The guide slits 11a1 and 11b1 are normally closed by the cover plates 11a2 and 11b2, so that the grinding fluid in the peripheral wall 11 does not leak to the outside of the peripheral wall 11. Note that the spectacle lens ML approaches and separates from the grinding wheel 35 as the lens rotation shafts 23 and 24 move up and down.

Further, when the spectacle lens ML is attached to the lens rotation shafts 23 and 24 such as a fabric lens and when the eyeglass lens ML is detached after the grinding process is finished, the lens rotation shafts 23 and 24 are positioned at intermediate positions in the vertical direction of the guide slits 11a1 and 11b1. As described above, the carriage 22 is positioned at the center of rotation in the vertical direction.
Further, the carriage 22 is tilted by being controlled to rotate up and down according to the amount of grinding of the spectacle lens ML at the time of edge thickness measurement and grinding (the rotation drive system 16 of the lens rotation shafts 23 and 24).
The rotation drive system 16 of the lens rotation shafts 23, 24 is held on the carriage 22 by a lens rotation shaft drive motor (lens shaft rotation drive means) fixed by a fixing means (not shown), and is rotatably held by the carriage 22. A power transmission shaft (drive shaft) 25a interlocked with the output shaft of the lens rotation shaft drive motor 25, a drive gear 26 provided at the tip of the power transmission shaft 25a, and one of the lens rotation shafts meshed with the drive gear 26 23 has a driven gear 26a attached to 23. In FIG. 7, a worm gear is used for the drive gear 26 and a worm wheel is used for the driven gear 26a. A bevel gear (bevel gear) can be used for the drive gear 26 and the driven gear 26a.

  Further, the rotation drive system 16 includes a pulley 27 fixed to an outer end portion of one lens rotation shaft 23 (an end portion opposite to the lens rotation shaft 24 side), and a power transmission mechanism 28 provided on the carriage 22. And a pulley 29 rotatably held at the outer end of the other lens rotation shaft 24 (the end opposite to the lens rotation shaft 23). The pulley 29 is provided so as to be movable relative to the lens rotation shaft 24 in the axial direction, and the carriage 29 is arranged so that the position in the axial direction does not change when the lens rotation shaft 24 is moved and adjusted in the axial direction. The movement is restricted by a movement restricting member (not shown) provided in 22.

The power transmission mechanism 28 includes transmission pulleys 28a and 28b and transmission shafts (power transmission shafts) 28c in which the transmission pulleys 28a and 28b are fixed to both ends. The transmission shaft 28c is disposed in parallel with the lens rotation shafts 23 and 24, and is rotatably held on the carriage 22 by a bearing (not shown). Further, the power transmission mechanism 28 includes a drive side belt 28d spanned between the pulley 27 and the transmission pulley 28a, and a driven side belt 28e spanned between the pulley 29 and the transmission pulley 28b. Yes.
When the lens rotation shaft driving motor 25 is operated to rotate the power transmission shaft 25a, the rotation of the power transmission shaft 25a is transmitted to the lens rotation shaft 23 through the drive gear 26 and the driven gear 26a, and the lens rotation shaft 23 is thus rotated. And the pulley 27 is rotationally driven integrally. On the other hand, the rotation of the pulley 27 is transmitted to the pulley 29 via the drive side belt 28d, the transmission pulley 28a, the transmission shaft 28c, the transmission pulley 28b, and the driven side belt 28e, and the pulley 29 and the lens rotation shaft 24 are integrally rotated. Is done. At this time, the lens rotation shaft 24 and the lens rotation shaft 23 are rotated in unison with each other.

(Grinding means 17)
The peripheral wall 11 forming the processing chamber 4 of the grinding part 10 has side walls 11a and 11b as described above. The grinding part 10 is provided with a grinding means 17 as shown in FIG.
The grinding means 17 is positioned outside the side wall 11 a and is supported by a support frame (support member) 30 fixed to the tray 12, bearings 31, 31 attached to the upper end of the support frame 30, and the processing chamber 4. A grindstone rotating shaft 32 that is disposed and has one end rotatably supported by bearings 31, 31, and a grindstone driving motor 33 that is mounted in the lower end of a support frame (support member) 30. The rotational driving force of the grindstone driving motor 33 is transmitted to the grindstone rotating shaft 32 by a power transmission mechanism (not shown). As this power transmission mechanism, a gear power transmission mechanism, a belt power transmission mechanism using a pulley and a belt, or the like can be used.

The grindstone rotating shaft 32 is inclined downward as shown in FIGS. In FIG. 6, when the axis of the grindstone rotating shaft 32 is O1, the axis (virtual line) O2 parallel to the axis O of the lens rotating shaft 24, and the angle formed by the axes O1 and O2 are ξ, the grindstone rotating shaft 32 is downward. (In actual design, the carriage draws an arc trajectory, so it is not simply an inclination angle with respect to the lower side, but assumes a plane passing through a specific position of the lens axis movement trajectory, and the wheel rotation axis is tilted within that plane. Is disposed in the machining chamber 4 in a state of being inclined at an inclination angle ξ.
The grinding means 17 has a tapered grinding wheel 35 fixed to the grindstone rotating shaft 32 as a conical grinding wheel. The taper angle (cone angle) of the grinding wheel 35 is the same as the inclination angle ξ, and the ridge line on the lens rotation shafts 23 and 24 side of the outer peripheral surface (taper surface) of the grinding wheel 35 is parallel to the lens rotation shafts 23 and 24 or They are provided substantially in parallel.

  As shown in FIG. 6, the grinding wheel 35 includes a tapered roughing grinding wheel 36 for roughing a plastic lens, a tapered roughing grinding wheel 37 for roughing a glass lens, and a finishing wheel 38. , A tapered mirror-finishing grindstone 39 and a grooving grindstone 40 are provided in this order. The finishing grindstone 38 includes a chamfering grindstone portion 38a and a bevel groove portion 38b for forming a bevel ridge. In addition, the grindstone rotating shaft 32 penetrates each grindstone 36-40.

  The grooving grindstone 40 is formed by integrally forming a thin grooving grindstone portion 40b on the periphery of the grindstone disk main body 40a. In addition, the grooving grindstone 40b is positioned on the opposite side of the mirror-finishing grindstone 39. The grindstone disk main body 40a is inclined with respect to the lens rotation shafts 23 and 24 for mounting, but the thin grooved grindstone portion 40b is located on the lens rotation shafts 23 and 24 side. Is set to be perpendicular to.

  Each of the grindstones 36 to 40 is formed in a tapered shape such that the diameter gradually decreases in the arrangement direction, and the entire grinding grindstone 35 is generally tapered in the arrangement direction. Each of the grindstones 36 to 40 is fixed to the grindstone rotating shaft (spindle) 32 by a fixing screw 200 screwed to the tip of the grindstone rotating shaft (spindle) 32 so as not to come off from the tip. Although not shown, the roughing grinding wheel 37 is not moved in a direction opposite to the tip from a predetermined position of the grindstone rotating shaft (spindle) 32 by known means (for example, a step or a taper) not shown. Provided. Reference numeral 200a denotes a head of the fixing screw 200, 200b denotes a screw portion of the fixing screw 200, 200c denotes a ring shape in which the peripheral surface supports the mirror-finishing grindstone 39 and the grooving grindstone 40, and the screw portion 200b of the fixing screw 200 penetrates. A (annular) spacer 200 b is a washer interposed between the head 200 a of the fixing screw 200 and the grooving grindstone 40.

<Center distance adjusting means 43>
By the way, the distance between the lens rotating shafts 23 and 24 and the grindstone rotating shaft 32 is adjusted by the inter-axis distance adjusting means (inter-axis distance adjusting mechanism) 43 shown in FIGS.
The inter-axis distance adjusting means 43 has a rotation axis 34 having an axis parallel to the lens rotation axes 23 and 24. The rotating shaft 34 is rotatably supported on the side wall 11a. The inter-axis distance adjusting means 43 has a pressure adjusting mechanism 45.

As shown in FIG. 5, the pressure adjusting mechanism 45 includes a guide roller 51 attached to the tray 12 with a rotation axis parallel to the carriage turning shaft 21, opening rollers 52 and 53 attached horizontally to the tray 12, A spring 54 having one end fixed to the side wall 11a in FIG. One end of the wire 55 is connected to the other end of the spring 54.
The pressure adjusting mechanism 45 includes a mover displacement motor 48 attached to the lower surface of the carriage 22, a feed screw 48 a provided coaxially with an output shaft (not shown) of the mover displacement motor 48, The movable member 50 is screwed to the screw 48a. The feed screw 48a extends vertically in the direction orthogonal to the axis parallel to the axis of the carriage turning shaft 21 and in the direction of inclination of the carriage 22, and moves the movable element 50 up and down by rotation. ing.

In addition, the other end of the wire 55 is fixed to the mover 50. As a result, the spring force of the spring 54 urges the carriage 22 to rotate downward about the carriage turning shaft 21 via the wire 55.
The inter-axis distance adjusting means 43 includes a base board 56 held by the rotary shaft 34, a pair of parallel guide rails 57, 57 attached to the base board 56 and extending obliquely upward from the upper surface, A screw shaft (feed screw) 58 provided on the base board 56 so as to be parallel and rotatable, a pulse motor 59 provided on the lower surface of the base board 56 to rotate the screw shaft 58, and the screw shaft 58 are screwed. The guide rails 57 and 57 have a pedestal 60 held so as to be movable up and down.
Furthermore, the inter-axis distance adjusting means 43 holds the upper end of the guide rails 57 and 57, the lens shaft holder 61 disposed above the pedestal 60 and held on the guide rails 57 and 57 so as to be movable up and down. A reinforcing member 62 that rotatably holds the upper end portion of the screw shaft 58 is provided.

The lens shaft holder 61 is always urged downward and pressed against the receiving table 60 by the weight of the carriage 22 and the spring force of the spring 54 of the pressure adjusting mechanism 45 shown in FIG.
Further, a sensor S for detecting the contact of the lens shaft holder 61 is attached to the cradle 60 as shown in FIG.
When the pedestal 60 is raised or lowered along the guide rails 57 and 57 by the screw shaft 58 by rotating the pulse motor 59 forward or backward to rotate the screw shaft 58 forward or backward, the lens shaft holder 61 is raised or lowered together with the cradle 60. As a result, the carriage 22 rotates about the carriage turning shaft 21.

<Edge thickness measuring system 18>
As shown in FIG. 3, an edge thickness measuring system (lens edge thickness measuring apparatus, edge thickness measuring means) 18 as a lens shape measuring apparatus includes a measuring element 41 disposed on the rear edge of the processing chamber 4 and a lens. A measuring shaft 42a provided in parallel with the rotary shafts 23 and 24 and having one end integrally provided with the measuring element 41, and a measuring unit (exposed to the upper part of the rear edge side of the side wall 11b) disposed outside the processing chamber 4 A measuring element movement amount detection unit) 42. The measuring shaft 42a penetrates the side wall 11b and protrudes into and out of the processing chamber 4.

(Measuring element 41)
As shown in FIGS. 3A and 4, the measuring element 41 has a feeler holding member 100 and a pair of feelers 101 and 102. The feeler holding member 100 includes a continuous portion 100a extending in the left-right direction and parallel opposing pieces 100b and 100c that protrude in the same direction at both left and right ends of the continuous portion 100a. Further, the feelers 101 and 102 are formed in a columnar shape and are attached to face the tip portions of the facing pieces 100b and 100c.
Further, the feeler holding member 100 is attached to a measuring shaft 42a extending through the side wall 11b and extending left and right as shown in FIG. The measuring shaft 42a is held by a measuring unit 42 disposed outside the side wall 11b so as to be movable left and right. And this measurement part 42 detects the movement amount to the left and right of the feeler holding member 100 via the measurement axis 42a.

(Control circuit)
The above-described operation panels 6 and 7 (that is, the switches of the operation panels 6 and 7) are connected to an arithmetic control circuit (arithmetic control means, arithmetic means) 80 having a CPU as shown in FIG. The arithmetic control circuit 80 is connected to a ROM 81 as a storage unit, a data memory 82 as a storage unit, and a RAM 83, and a correction value memory 84.
Furthermore, the liquid crystal display 8 is connected to the arithmetic control circuit 80 via a display driver 85, and a pulse motor driver (pulse motor drive circuit) 86 is connected. The pulse motor driver 86 is controlled and operated by the arithmetic control circuit 80, and various drive motors of the grinding section 10, that is, the base drive motor 14, the lens rotating shaft drive motor 25, the mover displacement motor 48, and the pulse motor. 59 and the like are controlled to operate (drive control).

Further, the grindstone drive motor 33 is connected to the arithmetic control circuit 80 via a motor driver (motor drive circuit) 86a. 1 is connected to the arithmetic control circuit 80 via a communication port 88, and frame shape data and lens shape data from the lens shape measuring device 1 (frame shape measuring device) 1 are connected. The lens shape data such as is input.
In addition, a movement amount detection signal from the measurement unit 42 is input to the arithmetic control circuit 80.

The arithmetic control circuit 80 includes a lens rotation shaft driving motor 25 and a pulse motor 59 that are controlled based on the driving pulse of the base driving motor 14 and the target lens shape data (θi, ρi) from the target lens shape measuring apparatus 1. Coordinate position of the front refractive surface of the spectacle lens ML (the surface on the left side of the spectacle lens in FIG. 4) in the target lens shape data (θi, ρi) from the drive pulse such as And the coordinate position of the rear refracting surface (the right side surface of the spectacle lens in FIG. 4), respectively, and the coordinate position of the front refracting surface of the spectacle lens ML and the rear in the obtained lens shape data (θi, ρi). The edge thickness Wi is obtained by calculation from the coordinate position of the side refractive surface.
The arithmetic control circuit 80 performs time-sharing when there is data reading from the target lens shape measuring apparatus 1 or data stored in the storage areas m1 to m8 of the data memory 82 after the machining control is started. Processing control, data reading and layout setting control are performed.

  That is, if the period between times t1 and t2 is T1, the period between times t2 and t3 is T2, the period between times t3 and t4 is T3,..., And the period between times tn-1 and tn is Tn. Processing control is performed during periods T1, T3,... Tn, and data reading and layout setting are controlled during periods T2, T4,. Therefore, during the grinding of the lens to be processed, the next plurality of target lens shape data can be read and stored, the data can be read and the layout can be set (adjusted), and the data processing efficiency can be greatly improved. Be able to.

The ROM 81 described above stores various programs for controlling the operation of the lens grinding apparatus 2, and the data memory 82 is provided with a plurality of data storage areas. Further, the RAM 83 is provided with a machining data storage area 83a for storing machining data currently being machined, a new data storage area 83b for storing new data, and a data storage area 83c for storing frame data, processed data, and the like. ing.
As the data memory 82, a readable / writable FEEPROM (flash EEPROM) can be used, or a RAM using a backup power source that prevents the contents from being erased even when the main power is turned off can be used.
Further, the arithmetic control circuit 80 includes a lens processing data memory, a correction table memory (correction data memory), a reference rotation speed memory for the lens rotation axis, a shape information memory, a shaft distance memory, and a deviation angle memory. It is connected.

[Action]
Next, the function of the arithmetic control circuit 80 described above will be described together with the operation.
(1). Reading of lens shape data When the main power supply is turned on from the start standby state, the arithmetic control circuit 80 determines whether or not data is read from the target lens shape measuring apparatus 1.
That is, the arithmetic control circuit 80 determines whether or not the “data request” switch 7 c on the operation panel 6 has been pressed. If the “data request” switch 7 c is pressed and there is a data request, the data of the lens shape data (θi, ρi) is read from the target lens shape measuring device 1 into the new data storage area 83 b of the RAM 83. The read data is stored (recorded) in one of the storage areas m1 to m8 of the data memory 82. Accordingly, the arithmetic control circuit 80 displays a layout screen as shown in FIG. 2B on the liquid crystal display 8, and the lens shape is displayed in the state display area E4 from the read target lens shape data (θi, ρi). Display. In FIG. 2B, the display of the lens shape is omitted.

(2). Measurement of edge thickness Wi Further, by operating the “clamp” switch 6a of FIG. 2A to separate the lens rotation shaft 23 in the axial direction with respect to the lens rotation shaft 24, the lens rotation shafts 23, 24 are moved. open. In this state, the spectacle lens ML is disposed on the lens rotation shafts 23 and 24, and the “clamp” switch 6a is operated again to bring the lens rotation shaft 23 closer to the lens rotation shaft 24 in the axial direction. The spectacle lens ML is held between the lens rotation shafts 23 and 24 by the lens rotation shafts 23 and 24.
After this clamping, the “left” switch 6b or the “right” switch 6c is operated in accordance with the right and left of the spectacle lens ML to start the measurement of the edge thickness Wi in the lens shape data (θi, ρi) of the spectacle lens ML. .

As a result, the arithmetic control circuit 80 controls the operation of the measuring unit 42 to bring the feeler 101 into contact with the front refractive surface of the spectacle lens (lens to be processed) ML, and the target lens shape data (θi, ρi). By controlling the operation of the lens rotation shaft driving motor 25 and the pulse motor 59 based on the above, the feeler 101 and the front refracting surface of the spectacle lens ML are moved relative to each other based on the target lens shape data (θi, ρi). Let
At this time, the feeler 101 is moved left and right according to the curvature of the front refractive surface, and the amount of movement to the left and right is measured by the measurement unit 42 via the measurement shaft 42a. The measurement signal from the measurement unit 42 is input to the calculation control circuit 80. The calculation control circuit 80 determines the front refractive surface of the spectacle lens ML in the target lens shape data (θi, ρi) based on the measurement signal from the measurement unit 42. Find the coordinate position.

Similarly, the arithmetic and control circuit 80 controls the operation of the measurement unit 42 to bring the feeler 102 into contact with (contact with) the rear refractive surface of the spectacle lens (lens to be processed) ML, and the lens shape data (θi, ρi). ) Based on the target lens shape data (θi, ρi) by controlling the operation of the lens rotating shaft driving motor 25 and the pulse motor 59 based on the lens shape data (θi, ρi). Move to touch.
At this time, the feeler 101 is moved left and right according to the curvature of the rear refracting surface, and the amount of movement to the left and right is measured by the measurement unit 42 via the measurement shaft 42a. The measurement signal from the measurement unit 42 is input to the calculation control circuit 80. The calculation control circuit 80 is based on the measurement signal from the measurement unit 42 and the rear refractive surface of the spectacle lens ML in the target lens shape data (θi, ρi). Find the coordinate position of.
A specific method disclosed in Japanese Patent Application No. 2001-30279 can be adopted as a specific method for determining the coordinate position of the front refracting surface and the coordinate position of the rear refracting surface, and detailed description thereof will be omitted.

Then, the edge thickness Wi is obtained by calculation from the coordinate position of the front refractive surface and the coordinate position of the rear refractive surface of the eyeglass lens ML in the obtained lens shape data (θi, ρi).
Further, the arithmetic control circuit 80 can be provided with an appropriate bevel curve setting device described in, for example, Japanese Patent Application Laid-Open No. 11-42543, and at least any arbitrary selected from the target lens shape data (θi, ρi). The bevel apex positions to be divided at different edge division ratios determined in advance from combinations of the edge thickness data Wi at two locations, the selected target lens shape data (θi, ρi), and the selected edge thickness data Wi. The bevel curve of the spectacle lens can be obtained.

(3). Calculation of processing data In FIG. 6, the grindstone rotating shaft (conical grindstone rotating shaft) 32 and the lens rotating shafts 23 and 24 are arranged in a plane. The grindstone rotating shaft 32 has a tapered grinding grindstone (conical grindstone) 35. When the inclination angle of the outer peripheral surface of the grinding wheel (conical grindstone) 35 with respect to the grindstone rotation shaft 32 is a cone grindstone inclination angle (taper angle), the grindstone rotation shaft (rotation shaft) 32 is inclined at substantially the same angle as the cone grindstone inclination angle. By doing so, it becomes possible to perform contact grinding in a state where the peripheral surface of the grinding wheel 35 and the edge surface of the spectacle lens ML are parallel or substantially parallel.

Therefore, as described above, if the axis of the grindstone rotation axis (conical grindstone rotation axis) 32 is O1, and the axis O2 parallel to the axis O of the lens rotation axes 23 and 24 and the angle formed by the axes O1 and O2 are ξ, the grindstone The rotary shaft 32 tilts the inclination angle of the outer peripheral surface of the grinding wheel (conical grindstone) 35 with respect to the grindstone rotation shaft 32 downward by the cone grindstone inclination angle (taper angle) by the inclination angle ξ, whereby the grinding wheel 35 and the spectacle lens ML are arranged. In this state, contact grinding is possible in a state where the edge surface is parallel or substantially parallel. For example, the roughing grinding wheels 36 and 37 and the mirror-finishing grinding stone 39 of the grinding wheel 35 are in a state where the contact surface of the spectacle lens ML is parallel or substantially parallel and can be subjected to line contact grinding.
The peripheral edge of the eyeglass lens ML that is circular and unprocessed by the rough grinding wheels 36 and 37 and the mirror-finishing grinding stone 39 of the grinding wheel 35 is a lens shape of the lens shape data (θi, ρi) (FIG. 15, Before rough grinding to the target lens shape MLF (lens shape) shown in FIG. 167, the radius (the radius at the center position in the axial direction or the width direction) of the rough grinding wheels 36 and 37 and the mirror finish grinding stone 39 and the ball Based on the mold shape data (θi, ρi), the position at which the spectacle lens ML contacts the rough grinding wheels 36 and 37 and the mirror finish grinding wheel 39 is calculated as machining data.

In addition, the radius of each grindstone 36, 37, 39 etc. of the grinding wheel 35 for calculating | requiring center distance data is the radius data of the center position of the axial direction (namely, width direction) of each grindstone 36, 37, 39, for example. Although used as the reference radius, radius data of the ends in the axial direction (that is, the width direction) of the grindstones 36, 37, and 39 may be used as the reference radius.
The processing data includes a position at which the spectacle lens ML contacts the grinding wheel 35, an inter-axis distance between the axis of the grinding wheel 35 and the center of the spectacle lens ML (axis axes of the lens rotation shafts 23 and 24), and the spectacle lens ML. There are movement control amounts of the spectacle lens ML and the carriage 22 in the Z-axis direction (the axial directions of the lens rotation axes 23 and 24) by the spherical refractive surface, and the like.

By the way, when the grinding wheel 35 and the spectacle lens ML are viewed from the direction along the lens rotation axes (lens axes) 23 and 24 (the axial direction of the lens rotation axes 23 and 24), that is, from the direction of the arrow A1 shown in FIG. When the grinding wheel 35 and the spectacle lens ML are viewed, the grinding wheel 35 looks oval as shown in FIG. 11, and the spectacle lens ML looks like a perfect circle. On the other hand, when the grinding wheel 35 and the spectacle lens ML are viewed from the direction along the axis of the grinding wheel 35, that is, when the grinding wheel 35 and the spectacle lens ML are viewed from the direction of the arrow A2 shown in FIG. As shown in FIG. 13, it looks like a perfect circle, and the spectacle lens ML looks oval.
In calculating the machining data described above, two machining data calculation methods are conceivable. Here, IpD in FIG. 12 is a first virtual plane perpendicular to the grindstone rotation axis 32, and IpL in FIG. 10 is a second virtual plane perpendicular to the lens rotation axes 23 and 24, and the processing data calculation method is as follows. explain.

In the first processing data calculation method, the grinding wheel 35 is moved from the direction along the lens rotation axes (lens axes) 23, 24 (the axial direction of the lens rotation axes 23, 24) to the second virtual plane IpL (see FIG. 10). , That is, the grinding wheel 35 is projected onto the second virtual plane IpL from the direction indicated by the arrow A1 in FIG. 10, and the elliptical shape of the grinding wheel 35 as shown in FIGS. 14 and 15 is used. It is.
Further, the second processing data calculation method projects the grinding wheel 35 on the first virtual plane IpD (see FIG. 12) from the direction along the axis of the grinding wheel 35 indicated by the arrow A2 in FIG. The grinding wheel 35 is a method using the perfect circle shape of the grinding wheel 35 as shown in FIGS.

When the elliptical projection shape of the grinding wheel 35 in the first processing data calculation method is used, the elliptical projection shape of the grinding wheel 35 and the target lens shape data (θi, ρi) shown in FIGS. 14 and 15 are used. When obtaining the position P (see FIG. 15) where the spectacle lens ML contacts the roughing grinding wheels 36, 37, the mirror finish grinding wheel 39, etc., the diameter to the position P of the elliptical projection shape on the plane of the grinding wheel 35 is determined. It is necessary to obtain it using an ellipse formula. In the following description, P is described as a contact point or a contact position.
However, the calculation formula becomes complicated in order to obtain the position where the spectacle lens ML contacts the rough grinding wheels 36, 37, the mirror finish grinding wheel 39, etc. using this elliptical formula. As a result, when the calculation control circuit 80 uses the calculation formula based on this elliptic formula to determine the position where the spectacle lens ML contacts the rough grinding wheels 36, 37, the mirror finish grinding wheel 39, etc., a perfect grinding wheel It takes a longer time to obtain the position where the spectacle lens ML contacts the rough grinding grindstones 36, 37, the mirror finishing grindstone 39, etc. using the projection shape of 35.

Further, in the case of using the perfect circle projection shape of the grinding wheel 35 in the second processing data calculation method, the perfect circle projection shape and the target lens shape data (θi, From ρi), a position P (see FIG. 17) where the spectacle lens ML contacts the rough grinding grindstones 36, 37, the mirror finishing grindstone 39, etc. is obtained.
In this case, the arithmetic expression for causing the arithmetic control circuit 80 to determine the position at which the spectacle lens ML contacts the rough grinding grindstones 36, 37, the mirror finishing grindstone 39, etc. is simplified, and the time for determining the contact position is also an elliptic expression. Therefore, the efficiency for obtaining the contact position can be increased.

In this embodiment, when processing data is calculated, the perfect circle projection shape of the grinding wheel 35 is used as shown in FIG. In other words, when calculating the machining data, it is projected onto the virtual plane of FIG. 12 orthogonal to the grindstone rotation axis 32, that is, the first virtual plane IpD inclined by the grindstone inclination angle ξ, and viewed from the direction along the grindstone rotation axis 32. When the grinding wheel 35 becomes a perfect circle, the projection data (θ, ρ) ξ on the virtual plane of the frame two-dimensional shape data, that is, the lens shape data (θ, ρ) is considered.
At this time, the projection data (θ, ρ) ξ assumes a state in which the spectacle lens ML (lens rotation shafts 23, 24) is rotated from the rotation start position as the reference position for each minute rotation angle θ. Is a rotation angle ζ from the reference position, the projection data changes depending on the rotation angle ζ. Let this be projection data (θ, ρ) ξ, ζ. The projection data when in the reference position (θi, ρi) ξ, can be expressed as ζ = θ _0. In this state, the projection data is a data group represented by i = _{0 to} n, and this data group exists by ζ = θ _{0 to} θn. Here, the projection data (θ, ρ) ξ, ζ can be expressed using the target lens shape data (θ, ρ) and ξ, ζ. When θ of the projection data is θ _ξ and ρ is ρ _ξ , θ _ξ = arctan (ρ · sin (θ−ζ) / (ρ · cos (ξ) · cos (θ−ζ))) and ρ _ξ = √ ((ρ · sin (θ−ζ)) ² + (ρ · cos (ξ) · cos (θ−ζ)) ² ).
As a result, the projection data can be expressed as (θi, ρi) ξ, ζ = θj (i = 0 to n, j = 0 to n).

  18A and 18B is in contact with the grinding wheel 35 in a state where a circular and unprocessed eyeglass lens is ground into a target shape (rectangular shape) by the grinding wheel 35. Indicates the state. 18A shows the spectacle lens ML and the grinding wheel 35 viewed from the direction of arrow A1 in FIG. 10 (the axial direction of the lens rotation shafts 23 and 24) when the spectacle lens ML is at 0 ° which is the rotation start position. FIG. 18B shows the spectacle lens ML and the grinding wheel 35 viewed from the direction of arrow A1 in FIG. 10 (the direction of the axis O1 of the grinding wheel 35) when the spectacle lens ML is at 0 °, which is the rotation start position. It is a schematic diagram. FIG. 18D shows a state when the spectacle lens ML of FIG. 18 is rotated 90 ° from the rotation start position. 18A to 18C are schematic diagrams illustrating an example of a state in which the target lens shape changes when the spectacle lens ML is rotated from the state of FIG. 18 to the state of FIG. 18D. FIGS. 18 and 18A to 18C show an intermediate process when the projection data (θi, ρi) ξ is obtained based on the target lens shape data (θi, ρi) ξ.

  Next, the calculation control circuit 80 performs the same operation as the calculation called the well-known ρL conversion, and calculates the distance Li between the axis of the grinding wheel 35 and the lens shape from the projection data (θi, ρi) ξ, ζ. = Θj (i = 0 to 1000, j = 0 to 1000) and the grindstone radius R. At this time, the control point at which the inter-axis distance L (the distance at the specific control position such as the bevel position) is the maximum at a specific lens rotation position (the specific point of the projection frame shape is a grindstone in the projection plane (circular)) The position where it touches. In this way, the arithmetic control circuit 80 has the number of divisions (rotation angle θi) of one rotation of the spectacle lens ML (lens shafts 23 and 24) and the grindstone radius R (tapered grindstone used for processing) depending on the purpose of use. The grinding wheel is different, and the inter-shaft distance Li according to the radius Ra of the rough grinding wheel, the radius Rv of the bevel finishing grinding wheel, the radius Rf of the flat finishing grinding wheel, the radius Rg of the grooved grinding wheel, and the radius Rc of the chamfering grinding wheel is set to the inter-shaft distance ( θ, L) Obtained as ξ, R, that is, distance between axes. Then, the arithmetic control circuit 80 stores the inter-axis distance data (θi, Li) ξ, R in the machining data storage area 83a. Actually, it is necessary to perform the calculation process and the storage process in accordance with the radius of the grindstone for each purpose, and the inter-axis distance data (θi, Li) ξ, Ra, (θi, Li) ξ, Rv, (Θi, Li) ξ, Rf,...

Next, the arithmetic control circuit 80 uses the inter-axis distance when the back projection is performed from the inter-axis distance data (θi, Li) ξ, R onto the second virtual plane IpL along the lens rotation axes (lens axes) 23, 24. The distance data (θi, Li) p, R is obtained as the inter-axis distance data for grinding and stored in the machining data storage area 83a. The inter-axis distance data (θi, Li) p, R can be obtained from the inter-axis distance data (θi, Li) ξ, R and the grindstone inclination angle ξ.
Further, since the refractive surface of the spectacle lens ML has a curvature (curvature radius) according to the prescription of the spectacles, the contact point P of the spectacle lens ML with the grinding wheel 35 is the radius ρi of the lens shape data (θi, ρi). In accordance with the Z-axis direction (the axial direction of the lens axes 23 and 24). Therefore, when performing processing control such as beveling, grooves, and chamfering on the spectacle lens ML in correspondence with the frame two-dimensional shape data (θ, ρ), that is, the target lens shape data (θi, ρi), the spectacle lens ML is connected to the carriage 22. It is necessary to control movement in the Z-axis direction (lens axis direction) integrally.

  Moreover, when the spectacle lens ML is ground into the target lens shape of the target lens shape data (θi, ρi) with the grinding wheel 35, the position P where the spectacle lens ML contacts the grinding wheel 35 as shown in FIG. A spectacle lens as shown in FIGS. 15 and 17 from the imaginary line La connecting the rotation center (axis O which is the center of the lens rotation shafts 23 and 24) and the rotation center (axis O1) of the grinding wheel 35 to the lens ML. The contact point (contact position) P of the ML grinding wheel 35 is displaced in the circumferential direction of the grinding wheel 35 by the moving radius ρi. For this reason, when performing processing control such as beveling, grooving, and chamfering on the spectacle lens ML in correspondence with the frame two-dimensional shape data (θ, ρ), that is, the target lens shape data (θi, ρi), the spectacle lens ML and the grinding wheel It is necessary to control the movement of the spectacle lens ML in the Z-axis direction (lens axis direction) together with the carriage 22 in consideration of the deviation of the contact point (contact position) P of 35 in the circumferential direction. Since the grinding wheel 35 is inclined in a tapered shape, the grinding wheel radius R differs depending on the intended grinding wheel. Therefore, the contact point (contact position) P of the spectacle lens ML with the grinding wheel 35 in the circumferential direction of the grinding wheel 35 is increased. The amount of deviation changes. In addition, since it is inclined in a taper shape, there is a displacement in the Z direction of the contact position on the grindstone with the amount of deviation in the circumferential direction, and it is affected by the radius of the grindstone used.

When the lens direction control data (θ, Z) is obtained for each rotation angle θi as the data for controlling processing such as beveling, grooves, and chamfering on the spectacle lens ML, when the Z direction control data Zi is obtained for each rotation angle θi, grinding with the spectacle lens ML is performed. If the Z direction displacement on the grindstone due to the circumferential displacement of the contact point (contact position) P of the grindstone 35 is not taken into account, the lens axis direction control data (θi) which is the Z direction control data Zi for each rotation angle θi. , Zi) can be obtained by a known method from the curvature (or radius of curvature) of the spectacle lens ML and the radius ρi.
However, in reality, the contact point (contact position) P of the spectacle lens ML with the grinding wheel 35 is displaced in the circumferential direction of the grinding wheel 35 in accordance with the change of the moving radius ρi. For this reason, at the stage of obtaining the inter-axis distance (θ, L) ξ, R, that is, the inter-axis distance data (θi, Li) ξ, R, a virtual connection between the grindstone rotating shaft 32 and the lens rotating shafts (lens axes) 23, 24. The deviation angle (Δθ, η) ξ, R from the point P0 on the line La to the control point (contact point P which is the contact position), that is, (Δθi, ηi) ξ, R is obtained.

Here, the deviation angle (Δθ, η) ξ, R (η) ξ, R, ie, (ηi) ξ, R is the value on the grinding wheel 35 side from the point P0 on the virtual line La to the control point (contact point P). The deviation angle (η, Δθ) ξ, R of (Δθ) ξ, R, that is, (Δθi) ξ, R is the spectacle lens ML from the point P0 on the virtual line La to the control point (contact point P). This is the side shift angle.
The contact point P of the spectacle lens ML with the grinding wheel 35 due to such a deviation angle (Δθ, η) ξ, R is the inclination angle ξ of the grinding wheel 35 and the spectacle lens ML at the radius (ρi) ξ, R. It can be determined from the curvature or radius of curvature of the refractive surface. The deviation angle (Δθi, ηi) ξ, R ηi and Δθi can be obtained by a known method.

Then, the above-described inter-axis distance data (θi, Li) ξ, R is obtained by correcting the above-described inter-axis distance data (θi, Li) ξ, R by using the deviation angle (Δθi, ηi) ξ, R. Moreover, the Z-direction control data (Zi) ξ of the spectacle lens ML when there is a deviation angle (Δθi, ηi) ξ, R is
Zξ, R = R · (1-cos (η)) · sin (ξ)
From (Zi) ξ, R = R · (1-cos (ηi)) · sin (ξ)
Can be obtained as
Then, the origin position of the carriage 22 in the Z-axis direction (axial direction of the lens rotation shafts 23 and 24) is set, and the Z-axis direction (lens) of the spectacle lens ML sandwiched between the carriage 22 and the lens rotation shafts 23 and 24 is set. When the Z-axis direction position in the axial direction of the rotation shafts 23 and 24 is Z, the lens axis direction control amount (Zx) of the carriage 22 and the spectacle lens ML is
(Zx) = Z + Zξ, R
Therefore, the lens axis direction control data of the actual rotation angle θi is (θ, Z + Zξ, R). The arithmetic control circuit 80 stores the lens axis direction control data (θ, Z + Zξ, R) thus obtained in the machining data storage area 83a.

  As described above, the arithmetic control circuit 80 is configured such that the projection data (θi, ρi) ξ, R, the inter-axis distance data (θi, Li) ξ, R, the deviation angle (Δθi, ηi) ξ, R, the inter-axis distance data (θi , Li) When inter-axis distance data (θi, Li) p, R, Z direction control data (θ, Z + Zξ, R), etc., obtained by inverse calculation based on the tilt angle ξ from ξ, R, are calculated as machining data, The calculated machining data is stored in the machining data storage area 83a.

(4). Forming a lens shape (lens shape) by rough grinding of the spectacle lens ML The arithmetic control circuit 80 is configured to control the inter-axis distance data (θi, Li) p, Ra, Z direction control data (θ, Z + Zξ, The grinding wheel driving motor 33 is operated and controlled by the motor driver 86a based on the machining data such as Ra), and the grinding wheel 35 is rotationally driven in the clockwise direction in FIG.
On the other hand, the arithmetic control circuit 80 drives and controls the lens rotation shaft drive motor 25 via the pulse motor driver 86 based on the processing data stored in the processing data storage area 83a, and the lens rotation shafts 23 and 24 and the spectacle lens. ML is rotationally controlled.
At this time, based on the machining data stored in the machining data storage area 83a, the arithmetic control circuit 80 first drives and controls the pulse motor 59 by controlling the operation of the pulse motor driver 86 at the position i = 0. The screw shaft 58 is reversely rotated, and the cradle 60 is lowered by a predetermined amount. As the cradle 60 is lowered, the lens shaft holder 61 is lowered integrally with the cradle 60 under the weight of the carriage 22 and the adjustment of the processing pressure adjusting mechanism.

With this lowering, after the unprocessed circular spectacle lens ML abuts on the roughing grinding wheel 36 or the roughing grinding wheel 37, only the cradle 60 is lowered. When the cradle 60 is separated downward from the lens shaft holder 61 due to the lowering, the separation is detected by the sensor S, and a detection signal from the sensor S is input to the arithmetic control circuit 80. After receiving the detection signal from the sensor S, the arithmetic control circuit 80 further drives and controls the pulse motor 59 to slightly lower the cradle 60 by a predetermined amount.
Thereby, the grinding wheel 35 grinds the spectacle lens ML by a predetermined amount based on the processing data. When the lens shaft holder 61 is lowered and comes into contact with the pedestal 60 along with this grinding, the sensor S detects this and outputs a detection signal, and this detection signal is input to the arithmetic control circuit 80.
Upon receiving this detection signal, the arithmetic control circuit 80 grinds the spectacle lens ML with a grinding wheel based on the machining data. Then, the arithmetic control circuit 80 performs such control i = n (the lens rotation shafts 23 and 24 make one rotation when i is n) so that the radius ρi ′ is obtained for each angle θi of the machining data. Then, the peripheral edge of the spectacle lens ML is ground by the rough grinding wheel 36 or the rough grinding wheel 37.
In such grinding, the arithmetic control circuit 80 discharges the grinding fluid from the grinding fluid supply device.

(5). Grooving process In order to hold the spectacle lens ML with the wire of the rimless frame, when the grooving process is performed on the peripheral portion (peripheral surface) of the spectacle lens ML ground to the shape of the processing data, the grinding wheel 35 is configured. The groove grindstone portion 40b of the groove grindstone 40 to be used is used. The grooving grindstone portion 40b is set to the smallest diameter among the grinding grindstones 35, and the contact point (contact position) with the peripheral surface of the spectacle lens ML roughly ground into a target lens shape is the moving radius ρi. Accordingly, the amount of wire grooves formed on the peripheral surface of the spectacle lens ML is reduced in the Z-axis direction even if the Z-axis direction is changed accordingly. In this machining, the arithmetic control circuit 80 determines the carriage 22 and the axis 22 based on the machining data such as the above-mentioned (3) inter-axis distance data (θi, Li) p, Rg, Z direction control data (θ, Z + Zξ, Rg). The eyeglass lens ML is lifted and lowered in the same manner as the rough grinding process described above, and the base drive motor 14 is operated and controlled based on the Z direction control data (θ, Z + Zξ, Rg). The eyeglass lens ML is controlled to move in the Z-axis direction (the axial direction of the lens rotation shafts 23 and 24).

(6). The beveling grinding wheel 35 has a finishing grindstone 38 provided with a chamfering grindstone portion 38a and a bevel groove portion 38b.
When the eyeglass lens ML is ground to frame the lens frame of the eyeglass frame, the arithmetic control circuit 80 performs the above-described (3) inter-axis distance data (θi, Li) p, Rv, Z direction control data ( The spectacle lens ML is controlled up and down on the basis of the processing data such as θ, Z + Zξ, Rv) and the like, and roughly ground into the shape of the processing data at the bevel forming groove 38a of the grinding wheel 35. A beveling process is performed on the peripheral edge of the spectacle lens ML. At this time, the arithmetic control circuit 80 controls the operation of the base drive motor 14 based on the Z direction control data (θ, Z + Zξ, Rv), and moves the eyeglass lens ML and the carriage 22 in the Z axis direction by the base drive motor 14. Let me control.

(7). Chamfering Chamfering is performed on the corner portion La between the front refracting surface Rf and the edge surface Fa and the corner portion Lb between the rear refracting surface Bf and the edge surface Fa in the peripheral portion of the spectacle lens ML that has been ground into a target lens shape. When performing, the chamfering grindstone part 38a of the finishing grindstone 38 is used.
In this chamfering process, the arithmetic control circuit 80 is configured to operate the carriage 22 based on the machining data such as the above-described (3) inter-axis distance data (θi, Li) p, Rc, Z direction control data (θ, Z + Zξ, Rc). The eyeglass lens ML is lifted and lowered in substantially the same manner as the rough grinding process described above, and the base drive motor 14 is operated and controlled based on the Z direction control data (θ, Z + Zξ, Rc). 22 and the spectacle lens ML are controlled to move in the Z-axis direction (axial direction of the lens rotation shafts 23 and 24).

(Modification 1)
In the embodiment described above, the grinding wheel 35 is projected onto a perfect grinding wheel shape, and the axis between the grinding wheel axis and the lens rotation axes 23 and 24 (rotation centers of the spectacle lens ML) from the perfect grinding wheel shape. Although an example in which the distance is obtained has been shown, the present invention is not necessarily limited thereto.
For example, when the unprocessed circular spectacle lens ML and the circular grinding wheel 35 shown in FIG. 10 are projected onto the second virtual plane IpL perpendicular to the axis O of the lens rotation axes 23 and 24, the spectacle lens ML The lens shape is a perfect circle as shown in FIG. 14, while the grindstone shape of the grinding wheel 35 is an ellipse as shown in FIG.

In FIG. 14, the line connecting the axis O of the lens rotation shafts 23 and 24 and the center (axis) O1 of the grinding wheel 35 is defined as the Y axis, and passes through the elliptical grinding wheel shape center (axis O1) of the grinding wheel 35. The line perpendicular to the axis is the X axis, the focal point c of the elliptical grindstone is (xc, yc), the focal point -c is (-xc, yc), and an arbitrary point of the elliptical grindstone shape is Pa.
If a is the major axis of the ellipse and b is the minor axis of the ellipse, the general formula of the ellipse is
x ^ 2 / a ^ 2 + y ^ 2 / b ^ 2 = 1 (1)
It becomes.
Here, the elliptical grindstone shape of the grinding wheel 35 projected onto the second imaginary plane IpL is deformed only in the Y-axis direction so that the Y-axis direction of the grindstone has a short diameter, and the X-axis direction of the grindstone shape. Becomes the major axis.

As a result, when the radius of the grinding wheel 35 is r and the inclination angle of the axis O1 of the grinding wheel 35 with respect to the axis O is ξ, the major axis a of the elliptical grinding wheel shape of the grinding wheel 35 projected onto the second virtual plane IpL. Is a = r (2)
The minor axis b depends on the grinding wheel inclination angle ξ,
b = r · cos (ξ) (3)
It becomes.
These formulas (2) and (3) are expressed by general formula (1)
Substituting into, the formula of the elliptical grinding wheel shape of the grinding wheel 35 is
x ^ 2 / r ^ 2 + y ^ 2 / (r · cos (ξ)) ^ 2 = 1 (4)
It becomes.

  As shown in FIG. 15, the rotation angle from the reference position of the spectacle lens ML is θi, and the lens shape (lens shape) ML of the spectacle lens ML is in contact with the elliptical grindstone shape of the grinding wheel 35 at the rotation angle θi. Assuming that the contact point is Pi, the contact point Pi of the spectacle lens ML is shifted by Δθ with respect to the rotation angle θi, and the line connecting the contact point Pi and the center of the grinding wheel 35 is η ( ηi). If the coordinates of the contact point Pi are (xp, yp) and the moving radius of the grinding wheel shape at this time is Rp, the grinding wheel shape data can be expressed as (ηi, Rp).

From the coordinates (xp, yp) of the contact point Pi, the distance in the Y-axis direction of the contact point Pi of the grinding wheel 35 is yp, and this distance yp is
xp ^ 2 / r ^ 2 + yp ^ 2 / (r · cos (ξ)) ^ 2 = 1 ···· (5) yp = √ {(1-xp ^ 2 / r ^ 2) · (r · cos (ξ))} (6)
The same concept as what is conventionally called ρL transformation is applied to an ellipse instead of a circle.
A control point (a specific point of the frame shape is in contact with the grindstone (ellipse)) at which the inter-axis distance L (the distance at a specific control position such as the bevel position) is the maximum at a specific lens rotation position is determined. (Θ, L) is determined to obtain the inter-axis distance L by the number of lens rotation angle divisions.
Lens axis direction control data (θ, Z) such as bevels, grooves, and chamfers for machining control corresponding to frame two-dimensional shape data (θ, ρ) can be obtained by means conventionally known.

On the other hand, at the stage of determining (θ, L), the contact point P (xp, yp) between the grindstone and the lens is determined, and the Y-direction length Yp from the grindstone center is obtained.
When the contact point P is in contact with the vertex of the ellipse in the Y direction, the Z direction contacts at that position, but the difference between the minor axis b and the Y coordinate yp of the contact point is determined by the tilt angle of the grinding wheel axis. ZW = (b−yp) Sin (ξ) = (r · cos (ξ) −yp) · sin (ξ)
Determined as
The Z direction control is performed using data obtained by adding the grinding wheel tilt angle correction amount (θ, ZW) to the lens axis direction control data (θ, Z).
The inter-axis distance is controlled based on (θ, L), and the lens axial direction control is controlled based on (θ, Z + ZW).

In addition, in the projection surface IpD, since the actual grindstone has a tapered shape as in the case of the grindstone shape projected in a perfect circle shape, the radius of each grindstone for each processing purpose is different. Since the control data is also generated when the projection surface is set to IpL and the grindstone is projected in an elliptical shape, it is necessary to obtain control data for each grindstone, but the details are the same. Therefore, it is omitted here.

<Removing machining interference during chamfering control>
FIG. 19 shows Embodiment 2 of the present invention. Hereinafter, the chamfering control of the second embodiment by the arithmetic control circuit 80 will be described with reference to FIG.
In general, it is known that the thickness of the lens edge surface changes depending on the combination of the frame shape of the spectacles and the lens power of the spectacle lens. When the peripheral surface of the spectacle lens is ground into a target lens shape, it is common to grind the outer peripheral surface of the spectacle lens with a grindstone having a cylindrical shape (or a partial cross section of a cone). However, it is difficult to determine the contact point of the spectacle lens to the grinding wheel, and the movement of the contact point can be reduced by reducing the outer shape of the grindstone, or the relative positional relationship between the grinding wheel and the spectacle lens is provided with flexibility. Some ideas have been implemented.

Therefore, when chamfering is performed on the corner of the edge of the spectacle lens MFL by the chamfering grindstone 38a of the finishing grindstone 38, the size, inclination, shaft inclination, etc. of the grinding grindstone are not affected, and it depends on flexibility. And means for obtaining control data that does not cause machining interference. That is, a shape (θ, ρ) chf that is smaller by the size of the chamfering width of the spectacle lens is obtained from the frame two-dimensional shape data (θ, ρ) as the chamfering width small shape data (see FIG. 19A). .
Here, θ of (θ, ρ) is a rotation angle obtained by dividing 360 °, which is one rotation of the spectacle lens and the lens rotation shafts 23 and 24, into n divisions (for example, 1000 divisions), and ρ is for each rotation angle θ. Means radial. Therefore, (θ, ρ) indicates the data of the moving radius when the rotation angle θ of the lens rotation shafts 23, 24 is changed from 0 to n, and actually (θi, ρi) [i = 0. , 1, 2... N], but “i” is omitted.

The same operation as that known from the (θ, ρ) chf is called a known ρL conversion, and the inter-axis distance Li (the distance at a specific control position such as the bevel position) is determined at a specific lens rotation position. A maximum control point (contact point P at which a specific point of the frame shape contacts the grindstone) is obtained. By obtaining the distance L between the axes by the number of divisions of one rotation of the spectacle lens ML (lens rotation axes 23 and 24), (θ, L) chf is obtained (see FIG. 19B). This (θ, L) chf is actually the inter-axis distance data (θi, Li) chf, but “i” is omitted.
Next, when a cutting plane (iv) passing through (θ, ρ) chf that becomes an actual control point (contact point P) and the center of the grindstone is assumed as shown in FIG. P) The chamfer width small shape data (θi, ρi) adjacent to chf and the grinding wheel center passing through the grinding wheel center (i) to (iii), (v) to (vii) outside or inside the grinding wheel surface (processing) It is determined whether it is in a state of being bitten by interference). At this time, since adjacent points exist in the direction of rotation of the lens and in the opposite direction, determination is made on both sides.

At this time, when it is determined that the surface is inside the grindstone surface, the amount of biting is stored in the machining data storage area 83a, the same determination is made at the next adjacent point, and the machining data is stored in the machining data storage area 83a. Let This determination is repeated until the outside of the grindstone surface is reached. The ± n-th neighboring point that maximizes the stored biting amount is obtained. The maximum amount of biting is defined as Δmax.
In this way, Z control data is obtained by adding the maximum bite amount Δmax to the lens surface data (θ, Z) chf obtained based on the frame shape (θ, ρ) chf for chamfering.
Then, when chamfering is performed on a corner portion of the edge of the peripheral edge of the spectacle lens ML that has been roughly ground into a target lens shape, the spectacle lens is obtained based on the obtained interaxial distance based on (θ, L) chf. The lens axis direction control (Z-axis direction control) of the ML and the carriage 22 is controlled by a value obtained by adding Δmax to (θ, Z).

<Removing machining interference during bevel control>
FIG. 20 shows Embodiment 3 of the present invention. Hereinafter, the bevel control according to the third embodiment by the arithmetic control circuit 80 will be described with reference to FIG.
In general, when a bevel shape is processed using a cylindrical or conical grindstone to follow the curve of a spectacle lens having a lens power, processing interference occurs, and the amount of the interference is affected by the lens power and the frame shape. It is well known that the amount of interference increases as the lens power increases, and the amount of interference increases as the frame shape becomes linear, such as a rectangle.
Therefore, when the bevel processing is performed on the spectacle lens MLF by the beveling grindstone 38, the so-called ρL conversion conventionally used by using the frame two-dimensional shape data (θ, ρ) and the bevel grindstone radius is used at a specific control rotational position. A control point (contact point P at which a specific point of the frame is in contact with the grindstone) at which the inter-axis distance Li is maximum is obtained. (Θ, L) bvl is obtained by obtaining the distance L between the axes by the number of divisions of one rotation of the spectacle lens ML.

FIG. 20A shows the side surface of the grindstone shape in a contact state at a specific position P (processing point) together with the finished spectacle lens shape when it is assumed that no processing interference has occurred. In FIG. 20B, the spectacle lens front, the contact point P (processing point) and the cross section (iv) position passing through the grinding wheel axis, and the frame shape point adjacent to the contact point P (processing point) and the grinding wheel axis are passed. Sections (i) to (vii) are shown. FIG. 20C illustrates part of the cross-sectional state at the cross-sectional position illustrated in FIG. The cross section (iv) in FIG. 20C is a cross section passing through the contact point P (processing point), and the finished lens and the bevel grindstone are in contact with each other in the entire bevel shape when it is assumed that no processing interference has occurred. When the frame shape trajectory of the bevel apex is considered, the bevel apex is in contact with the grindstone on both the bevel lens surface side and the bevel lens rear surface side.

On the other hand, when the points adjacent to the contact point P (processing point) are sequentially considered on both sides of the contact point P (processing point), the cross-sections (i) and (ii) of the adjacent points indicate the rear surface of the bevel lens. It is on the inner side (biting into the grindstone) with respect to the inclined surface on the side, and on the outer side (away from the grindstone) with respect to the inclined surface on the lens surface side of the bevel. In the cross sections (vi) and (vii), they are inside (biting into the grinding stone) with respect to the inclined surface on the lens surface side of the bevel, and are outside (grinding stone) with respect to the inclined surface on the lens back surface side of the bevel. Away from). In this way, it is determined whether the point adjacent to the frame-shaped contact point P (processing point) with respect to the inclined surface on the lens surface side or back surface side of the bevel is inside or outside of the grindstone cross section including the adjacent point. You can determine whether or not you bite. When it can be determined that there is no bite, the contact point P (processing point) is controlled using a value for controlling the processing.

  When there is a bite, the bite amount is calculated as an amount parallel to the distance between the grinding wheel axis and the lens axis, and the bevel lens surface side ΔYf and the bevel lens back side ΔYb are obtained. This is calculated sequentially in both directions adjacent to the contact point P (processing point), and the sizes thereof are compared, and ΔmaxYf and ΔmaxYb at which the amount of biting on the front surface side of the bevel and the rear surface side of the bevel are maximized, respectively. Ask. Generally, the maximum biting amount is obtained as the biting amount of adjacent points in different directions of the contact point P (processing point) on the front surface side of the bevel lens and the rear surface side of the bevel lens. Further, since this bite amount can be calculated as the bite amount in the direction Z parallel to the lens axis, adjacent points where the maximum bite amount ΔmaxYf, ΔmaxYb in the direction parallel to the interaxial distance are obtained. Then, the amount of biting in the direction Z parallel to the lens axis is obtained and set as ΔmaxZf and ΔmaxZb.

The maximum bite amounts ΔmaxYf and ΔmaxYb in the direction parallel to the inter-axis distance are close to each other if the frame shape is finely divided, but they do not match. Therefore, the inter-axis distance at the frame rotation control angle for processing the point P (processing point) that is in contact as a two-dimensional shape is an average value of ΔmaxYf and ΔmaxYb, and is a value obtained by adding (ΔmaxYf + ΔmaxYb) / 2 to the original inter-axis distance. To control.
For the direction Z parallel to the lens axis, (ΔmaxZf + ΔmaxZb) / 2, which is the average value of ΔmaxZf and ΔmaxZb, is obtained. Since ΔmaxZf and ΔmaxZb are values in directions different from each other, an intermediate position is obtained. The direction Z parallel to the lens axis is controlled by adding this value to the Z value for controlling the contact point P (processing point).
The average value in the Z direction is a correction in the Z direction, but results in balancing the respective deviations in the Y direction by averaging different ΔmaxYf and ΔmaxYb in the Y direction.

  The states of the cross-sections (ii), (iv), and (vi) by this control (removing the machining interference) are shown in a diagram instructing “with interference removal” in FIG. In the cross section (iv) showing the machining state of the control angle, the contact point P (machining point) is in a floating state without contact. Further, in the cross section (vi) where the amount of biting is the largest on the lens surface side of the bevel, the bevel lens surface side of the finished lens without processing interference and the front surface of the bevel grindstone are in contact. Similarly, in the cross section (ii) where the amount of biting is the largest on the backside of the bevel lens, the backside of the bevel and the backside of the bevel grindstone of the finished lens without processing interference are in contact. FIG. 20E shows an enlarged plan view of a bevel portion of the spectacle lens MLF, particularly a contact point P (processing point) portion thereof. In the diagram indicating “no interference removal”, the grindstone contact portion is in contact with the lens surface side and the lens back surface at the bevel apex P and spreads in different directions. In FIG. 20E, the instruction diagram “with interference removal” shows a state in which the grindstone contact portions are separated from each other on the lens surface side and the lens back surface side and become a limited part.

<Removing machining interference during grooving control>
FIG. 21 shows Embodiment 4 of the present invention. Hereinafter, the grooving control of the fourth embodiment by the arithmetic control circuit 80 will be described with reference to FIG.
In grooving, generally, a small-diameter cylindrical or conical grindstone is used. Although the influence is small due to the small-diameter grindstone, machining interference occurs because the machining follows the curve of the spectacle lens. The amount of interference is affected by the lens power and the frame shape. It is well known that the amount of interference increases as the lens power increases, and the amount of interference increases as the frame shape becomes linear, such as a rectangle. In general, a small-diameter grindstone is used to reduce the amount of interference, and it is known that tilting the grooved grindstone axis with respect to the lens axis also has the effect of reducing the amount of interference. Yes. However, it varies depending on the lens power and the frame shape and cannot be said to have a stable and sufficient effect.

  Therefore, when grooving the spectacle lens MLF with the grooving grindstone 40, the groove core frame shape data through which the core of the yarn entering the groove passes from the frame two-dimensional shape data (θ, ρ) matching the outer diameter of the finished lens. (Θ, ρ) grv is calculated. FIG. 21C shows the relationship between the groove of the spectacle lens MLF, the filament wire diameter, and the grooving grindstone 40. The so-called ρL transformation is used to determine the maximum inter-axis distance Li at a specific rotational position using the obtained groove core frame shape data and the grooving wheel radius [= (external wheel radius) − (element wire radius)]. A control point (contact point Pf at which a specific point of the frame shape is in contact with the grooving grindstone) is obtained. By determining the distance L between the axes by the number of divisions of one rotation of the spectacle lens ML, (θ, L) grv is obtained.

  FIG. 21 shows a finished spectacle lens shape (including a groove shape) when it is assumed that no machining interference has occurred, and a grooving grindstone shape in a contact state at a specific position Pf. In FIG. 21B, the position of the cross section (iii) passing through the front surface of the spectacle lens and its contact point Pf and the grindstone axis, and the cross section (i) to (v) passing through the frame shape point adjacent to the contact point Pf and the grindstone axis. ) Position. FIG. 21D illustrates a cross-sectional view of the cross-sectional position illustrated in FIG. The cross section (iii) is a cross section passing through the contact point Pf, and assuming that machining interference does not occur, the grooved lens and the grooved whetstone contact the grooved grindstone on both the groove lens front side and the groove lens back side. It will be in the state.

On the other hand, when the points adjacent to the contact point Pf are sequentially considered on both sides of the contact point Pf, the adjacent points are inside the grinding wheel surface on the lens surface side (grinding stone) in the sections (i) and (ii). Bite inside). Cross sections (iv) and (v) are outside (away from the grindstone) with respect to the groove grindstone surface on the lens surface side. The presence or absence of biting on the lens surface side can be determined by determining that the groove core frame shape is inside or outside the groove surface on the lens surface side. When it can be determined that there is no bite, control is performed using a lens axis direction control value for processing control of the contact point Pf.

Similarly, the contact point Pb on the lens back side and its adjacent points are also determined to be inside (biting into the grindstone) or outside (away from the grindstone) with respect to the grooved grindstone surface. When it is determined whether or not there is biting on the side, and it is determined that there is no biting, control is performed using a lens axis direction control value for controlling the processing of the contact point Pb.
If there is a bite, the bite amount is calculated as an amount parallel to the lens axis, and the groove lens surface side is obtained as ΔZf and the groove lens back side is obtained as ΔZb. This calculated successively to both adjacent to the contact point Pf, its magnitude compared with the lens surface side of the groove, DerutamaxZf the embedding amount of the lens rear surface side of the groove is maximum, respectively (FIG. 21 (D) cross section ( ii)), ΔmaxZb (FIG. 21D, cross section (iv)) is obtained. In general, the maximum biting amount is obtained as the biting amount of adjacent points in different directions at the contact point Pf on the groove lens surface side and the contact point Pb on the groove lens back surface side.

  FIG. 21D shows a cross section in which the thickness of the grooving grindstone matches the finished groove width. For the processing, as shown in FIGS. 21E and 21F, a grooved grindstone having a thickness smaller than the groove width is used. FIG. 21 (E) shows a state in which the lens surface side of the grooving grindstone 40 is in contact with the finished lens MLF when it is assumed that the processing interference in the section (ii) has not occurred. At the contact point Pf of the cross section (iii), ΔmaxZf is added to the lens axis direction control value for controlling the contact point Pf in order to eliminate the biting of the groove surface on the lens surface side, and this value is used in a direction parallel to the lens axis. Control. On the other hand, FIG. 21 (F) shows a state where the lens back surface side of the grooving grindstone 40 is in contact with the finished lens MLF when it is assumed that the processing interference of the section (iv) has not occurred. At the contact point Pb of the cross section (iii), ΔmaxZb is added to the lens axis direction control value for controlling the contact point Pb in order to eliminate the biting of the groove grindstone surface on the lens back side, and this value is used in a direction parallel to the lens axis. Control. In this way, grooving without processing interference is realized by processing the lens front side and the lens back side under different controls.

  When the lens front side and the lens back side are controlled differently, the sum of the additional movement amount ΔmaxZf on the lens front side and the additional movement amount ΔmaxZb on the rear side of the lens for removing processing interference is the finished groove width and the groove grinding wheel When the difference from the thickness is exceeded, processing control is given to control the lens surface side without processing interference, and processing interference is given to the lens back side. This results in processing interference on the surface side. In order to prevent this, the intentional control is obtained by obtaining the control amount using a value obtained by subtracting 1/2 of the amount exceeding the difference between the finished groove width and the thickness of the grooved grinding wheel from each additional movement amount. Prevents machining interference on the opposite surface. However, in this case, a portion that cannot be removed remains as a result of processing interference on the controlled surface side.

In the first embodiment, the example in which the outer diameter of the grooving grindstone 40 is formed larger than the outer diameter of the grindstone rotating shaft (spindle) 32 is shown, but the present invention is not necessarily limited thereto.
For example, as shown in FIG. 22, the screw portion 300 a of the fixing screw 300 is coaxially screwed to the tip of the grindstone rotating shaft (spindle) 32, and the grindstones 36 to 39 are connected to the tip of the grindstone rotating shaft (spindle) 32. The grinding wheel mounting shaft portion 300c having a smaller diameter than the grindstone rotating shaft (spindle) 32 is integrally formed on the fixing screw 300, and the grinding wheel mounting shaft portion is integrally formed with the fixing screw 300. A grooved grinding wheel 40 ′ having a diameter smaller than the outer diameter of the grindstone rotating shaft (spindle) 32 may be fixed to the 300 c with the fixing screw 202.

  According to this embodiment, when grooving a spectacle lens using the grooving grindstone 40 ', the contact point (contact position) to the peripheral surface of the spectacle lens ML ground into a target lens shape is the radius. Accordingly, the amount of wire groove formed on the peripheral surface of the spectacle lens ML in the Z-axis direction can be made smaller than that in the case of using the grooving grindstone 40 in the first embodiment even if the direction changes in the Z-axis direction.

23 to 25, a chuck 203 may be provided at the tip of the fixing screw 200, and a drill 204 for drilling may be attached to the chuck 203.
In this case, the fixing plate 205 of FIG. 25 to be fixed at a position where the tray 12 of FIG. 5 is omitted is provided, the spindle inclined base 206 of FIG. A spindle holding member (shaft holding member) 207 is rotatably held by an inclined shaft 208 in a shaft holding portion 206a.
Then, the grindstone rotating shaft (spindle) 32 is rotatably held by the spindle holding member (shaft holding member) 207. The grindstone rotating shaft 32 and the tilting shaft 208 are orthogonal to each other, and the tilt angle of the grindstone rotating shaft 32 with respect to the lens rotating shafts 23 and 24 can be adjusted by rotating the tilting shaft 208 around the axis.

A tilt motor (tilt angle adjusting motor) 209 is fixed to the fixed plate 205, and the rotation of the tilt motor 209 is transmitted to the tilt shaft 208 by the rotation transmitting means 210. The rotation transmitting means 210 has a drive gear 210a fixed to the output shaft 209a of the tilt motor 209 and a driven gear 210b fixed to the tilt shaft 208 and meshing with the drive gear 210a.
Further, a spindle drive motor 211 that rotates the grindstone rotating shaft 32 is attached to the spindle tilt base 206. Further, the rotation of the spindle drive motor 211 is transmitted to the grindstone rotating shaft 32 via the belt 212.
In this configuration, by operating the tilt motor 209 and transmitting the rotation of the tilt motor 209 to the tilt shaft 208 by the rotation transmitting means 210, the tilt shaft 208 is rotated about the axis, and the spindle tilt base 206 is rotated. Further, the spindle holding member 207 and the inclined shaft 208 are integrally rotated with the inclined shaft 208 around the axis.

  As a result, the grindstone rotating shaft 32 is rotated up and down around the axis of the inclined shaft 208 integrally with the spindle holding member 207, so that when grinding the periphery of the spectacle lens ML with the grinding grindstone 35, The grindstone rotation shaft 32 is rotated up and down so that the upper axis (the axis O2 which is a virtual line) is parallel to the axis O of the lens rotation shafts 23 and 24.

On the other hand, by driving the spindle drive motor 211, the rotation of the spindle drive motor 211 is transmitted to the grindstone rotating shaft 32 via the belt 212, and the grinding wheel 35 and the drill 204 are rotated integrally with the grindstone rotating shaft 32.
Accordingly, the grinding wheel 35 is driven to rotate by the spindle drive motor 211 in a state where the upper axis (the imaginary line axis O2) of the rotating wheel 35 is parallel to the axis O of the lens rotating shafts 23 and 24, and the lens. The rotation shaft driving motor 25 is controlled to operate based on the target lens shape data (θi, ρi) or the processing data, and the spectacle lens ML is rotated about the axis integrally with the lens rotation shafts 23 and 24. Along with this, the pulse motor 59 is controlled to operate based on the target lens shape data (θi, ρi) or the machining data to control the raising / lowering of the carriage 22, and the spectacle lens ML and the lens rotation shafts 23, 24 are controlled to move the carriage 22 up / down. Then, by adjusting the distance between the axes of the grinding wheel 35 and the lens rotation shafts 23 and 24, the grinding of the peripheral edge of the spectacle lens ML by the grinding wheel 35 can be performed in the same manner as in the first embodiment.

Further, in the case where an attachment hole for attaching a temple attachment bracket or a bridge fitting is formed at the edge of the spectacle lens ML that has been ground into a target lens shape in this way, the lens rotation shaft driving motor 25 and the pulse motor 59 are provided. , The operation of the tilt motor 209 is controlled to set the drilling position by the drill 204.
That is, in this setting, the lens rotation shaft driving motor 25 is operated and controlled based on the target lens shape data (θi, ρi) or the processing data, so that the spectacle lens ML is integrated with the lens rotation shafts 23 and 24 around the axis. At the same time, the pulse motor 59 is controlled to operate based on the target lens shape data (θi, ρi) or machining data, and the carriage 22 is controlled to move up and down, and the grindstone rotating shaft 32, the grinding wheel 35, and the lens rotating shafts 23, 24 are controlled. Adjust the distance between the axes. Accordingly, as described above, the axis of the grindstone rotating shaft 32 is rotated up and down to adjust the tip of the drill 204 to the height of the drilling position and attached to the tip of the grindstone rotating shaft 32. The axis of the drill 204 (matching the axis of the grindstone rotating shaft 32) is adjusted to be perpendicular to the tangent to the refractive surface of the spectacle lens ML. In this embodiment, the axis of the drill 204 is set to be perpendicular to the tangent of the refractive surface of the spectacle lens ML. However, the axis of the drill 204 is not necessarily perpendicular to the tangent of the refractive surface of the spectacle lens ML. There is no need to be. That is, the direction in which the hole is made is not limited.

After such setting of the drilling position, the spindle drive motor 211 is driven to rotate the drill 204 integrally with the grindstone rotating shaft 32, and the base drive motor 14 moves the carriage 22 in the Z-axis direction (the lens rotating shaft 23, 24 in the axial direction), and drilling is performed with a drill 204 at a drilling position at the peripheral edge of the spectacle lens ML.
According to this configuration, when opening a mounting hole for attaching the temple mounting bracket or the bridge bracket to the edge of the spectacle lens ML, it is not necessary to provide a drill rotation mechanism different from the rotation driving mechanism of the grinding wheel 35. The number of parts can be omitted.

(Modification)
In the sixth embodiment, the holding structure for the spectacle lens ML can be as shown in FIG. In FIG. 26, a support member 220 parallel to the lens rotation shaft 24 is fixed to the carriage 22, and a plate-like support arm 221 is fixed to the front end portion of the support member 220 toward the front end side of the lens rotation shaft 24. At the same time, a lens holding shaft 222 coaxial with the axis of the lens rotation shaft 24 may be held at the tip of the support arm 221 so as to face the tip of the lens rotation shaft 24 so as to be rotatable about the axis.
In this configuration, the lens holding shaft 222 and the support arm 221 are obstructive as shown in FIG. 27 when a drill 204 is used to open a mounting hole for mounting a temple mounting bracket or a bridge bracket on the edge of the spectacle lens ML. There is nothing.

(Modification)
In the sixth embodiment, the spindle shaft tilt angle can be adjusted by holding the spindle holding member (shaft holding member) 207 rotatably on the tilt shaft 208 on the cylindrical shaft holding portion 206a of the spindle tilt base 206 of FIG. However, the operation in the case where the tilt angle of the spindle shaft cannot be adjusted will be described.
In this case, the drill diameter is smaller than the target hole diameter. The tilt angle of the drill with respect to the lens axis is fixed to the tilt angle ξ of the spindle axis. The lens mounting hole is affected by the frame shape and lens power, and the hole position and drilling angle change, but the drilling angle is fixed at the tilt angle of the spindle axis, and the hole depth is adjusted to the drill diameter at the hole center position. Make a pilot hole with 1/2 to 3/4.
The display screen 8 displays numerically the drilling inclination angle with respect to the lens axis. Based on this numerical display, the operator can complete the drilling operation by inclining a lens holder such as a hand drill apparatus which is not related to the present invention based on the numerical display.

  Further, when the grindstone rotating shaft 32 is inclined, the inclination angle of the groove formed on the spectacle lens MLF (ML) edge surface by the grooving grindstone 40 of the grinding grindstone 35 is as follows. That is, the grindstone processing angle varies depending on the finished shape of the spectacle lens MLF, and these have the following relationship. FIG. 28 is an explanatory view showing a state in plan view of the spectacle lens MLF and the grooving grindstone 40 as seen from above.

  In FIG. 28, the imaginary line (first imaginary line) connecting the lens center (axis O) of the spectacle lens MLF and the grindstone center (axis O1) of the grooving grindstone 40 (grinding grindstone 35) is Lo, and the spectacle lens MLF. The processing point for the grooving grindstone 40 is Po, the line connecting the processing point Po and the center of the grindstone (axis O1) is the imaginary line (second imaginary line) Lp, and the angle between the imaginary lines Lo, Lp is the grindstone The machining angle η is assumed. In FIG. 28A, the inclination angle of the grooving grindstone portion 40b in the grooving grindstone 40 of the grinding grindstone 35 is defined as a grindstone axis inclination angle θa. In the first embodiment, the grindstone axis inclination angle θa is an inclination angle with respect to the edge surface (edge end face) Fa of the spectacle lens MLF (ML) or an imaginary line O2 (see FIG. 6) parallel to the edge surface Fa.

Further, as shown in FIG. 29, when the groove inclination angle with respect to the lens edge surface is τ, the groove inclination angle τ is
τ = arcsin (sin (θa) · sin (η)) (a)
It becomes.
On the other hand, the groove angle to be finished on the lens edge surface can be obtained by setting the lens shape of the spectacle lens MLF and the curve value of the groove formed on the edge surface.
Here, when the groove curve formed on the lens edge surface is C, the groove curve C is 4 to 5 curves (curvature radius R: 523/4 to 523/5) in a general frame. Further, the moving radius (lens moving radius) ρ _n (radius from a reference such as the geometric center) of the spectacle lens MLF is about 10 to 30 mm in a general frame. The moving radius ρ _n has a shape having a smaller part or a larger part than the value of a general frame. In this embodiment, n of the moving radius ρ is shown as a subscript ρ _n , but the moving radius ρ _n is the same as the above-described moving radius ρn.

Here, the groove inclination angle (lens radius vector ρn position) tau _n for lens edge surfaces, [rho _n-1 the radius of the front and rear radius [rho _n as shown in FIG. _30, and [rho _{n + 1,} the radius vector [rho _n And the radius ρ _n−1 is Δε, the groove inclination angle τ _n is τ _n = arcsin [[√ {(523 / C) ² − (ρ _{n + 1} ) ^2] with the curve value C to be processed as } −√ {(523 / C) ² − (ρ _n−1 ) ² }] / √ [(ρ _{n + 1} ) ² + (ρ _n−1 ) ² −2 · (ρ _{n + 1} ) · (ρ _n−1 ) Cos (2 · Δε)]] (b)
Can be obtained.
Here, 523 is a refractive index of a general crown glass lens from 1.523 and a radius of curvature = 1000 · (1.523-1) / C.
It is.

Therefore, the groove inclination angle τ _{n to} be finished on the lens edge surface of the spectacle lens MLF can be obtained by the above-described equation (b). However, if it can be arbitrarily controlled wheel spindle tilt angle θa, such that the tau matches the determined angle tau _n, the above-described the tau (a) in the grinding wheel axis tilt angle θa and the grindstone processed into formula The grinding wheel shaft inclination angle θa is obtained from the relationship with the angle η, and the operation of the inclination motor 209 in FIG. 25 is controlled so as to be the grinding wheel shaft inclination angle θa.
When the grindstone axis inclination angle θa is constant, the average value of τ _n determined from the curve of the general frame and the average τ determined from the grindstone processing angle η determined from the frame shape are close to each other. It is desirable to determine the whetstone axis inclination angle θa, which can be set within a range of ± 15 degrees, for example, about 25 degrees. In addition, since this numerical value is an example, it is not limited to this numerical value.

  As described above, the spectacle lens grinding apparatus according to the embodiment of the present invention is provided so as to be able to hold a spectacle lens and to be movable in the Z-axis direction which is the lens axis direction by a Z-axis direction drive motor. Based on the lens rotation axis, the lens shape data (θi, ρi) of the spectacle lens and the radius of the grindstone that grinds the periphery of the spectacle lens, Is calculated for each moving radius ρi of the target lens shape data (θi, ρi) to obtain interaxial distance data (θi, Li) composed of the interaxial distance Li and the rotation angle θi. Based on the inter-axis distance data (θi, Li), the lens axis rotation driving means is controlled to rotate the lens rotation axis for each rotation angle θi, and based on the inter-axis distance data (θi, Li) Actuation of distance adjustment means To and is adapted to adjust the distance Li between the axis for each of the rotation angle .theta.i. Further, the calculation control means is a chamfering grindstone at a peripheral bead shape point adjacent to the processing control point when assuming a contact state with the chamfering grindstone at the end of the spectacle lens edge at the processing control point on the target lens shape. The amount of biting is calculated, and chamfering control is performed with a control amount that adds the biting amount at the peripheral target lens shape point where the biting amount is maximum to the axial direction control amount of the lens rotation axis. Yes. According to this structure, it can process, without generating the biting at the time of the chamfering process which generate | occur | produces with a frame shape and a lens curve.

In addition, the spectacle lens grinding apparatus according to the embodiment of the present invention includes a lens rotation shaft that is provided so as to be capable of holding a spectacle lens and that can be moved and controlled by a Z-axis direction drive motor in the Z-axis direction that is the lens axis direction. And the lens shape data (θi, ρi) of the spectacle lens and the radius of the grindstone that grinds the periphery of the spectacle lens, the distance between the lens rotation axis and the grindstone rotation axis of the grinding wheel Li is calculated for each moving radius ρi of the target lens shape data (θi, ρi) to obtain interaxial distance data (θi, Li) composed of the interaxial distance Li and the rotation angle θi, and the interaxial distance Based on the data (θi, Li), the lens axis rotation driving means is controlled to rotate the lens rotation axis for each rotation angle θi, and the inter-axis distance adjustment means is based on the inter-axis distance data (θi, Li). Control the operation between the shafts A releasing Li and a calculation control means for adjusting for each of the rotation angle .theta.i. The grinding wheel has an outer peripheral surface formed in a taper shape, and the wheel rotation shaft has the lens rotation shaft such that a ridge line on the lens rotation shaft side of the grinding wheel is parallel to the axis of the lens rotation shaft. It is in a state where it is inclined by a grindstone inclination angle ξ with respect to an axis parallel to the axis. The calculation control means includes a bevel lens surface side inclined surface and a lens back surface side at a peripheral lens shape point adjacent to the processing control point when assuming a contact state with the bevel grindstone of the processing control point on the target lens shape. The amount of bite whetstone biting on each inclined surface was calculated, and the biting amount at the peripheral lens shape point where the biting amount was the maximum was added to the distance control amount between the lens rotation axis and the wheel rotation axis. The beveling process is controlled by the control amount. According to this configuration, the beveling can be performed into a desired accurate shape that does not cause the beveling stone to bite by the beveling curve and the beveling curve at the time of the beveling.

In addition, the spectacle lens grinding apparatus according to the embodiment of the present invention includes a lens rotation shaft that is provided so as to be capable of holding a spectacle lens and that can be moved and controlled by a Z-axis direction drive motor in the Z-axis direction that is the lens axis direction. And the lens shape data (θi, ρi) of the spectacle lens and the radius of the grindstone that grinds the periphery of the spectacle lens, the distance between the lens rotation axis and the grindstone rotation axis of the grinding wheel Li is calculated for each moving radius ρi of the target lens shape data (θi, ρi) to obtain interaxial distance data (θi, Li) composed of the interaxial distance Li and the rotation angle θi, and the interaxial distance Based on the data (θi, Li), the lens axis rotation driving means is controlled to rotate the lens rotation axis for each rotation angle θi, and the inter-axis distance adjustment means is based on the inter-axis distance data (θi, Li). Control the operation between the shafts Computation control means for adjusting the separation Li for each rotation angle θi is provided, and the grinding wheel has an outer peripheral surface tapered, and the grinding wheel rotating shaft is a ridge line on the lens rotating shaft side of the grinding wheel Is inclined by a grindstone inclination angle ξ with respect to an axis parallel to the axis of the lens rotation axis so that is parallel to the axis of the lens rotation axis. A grindstone for grooving, the grindstone width of which is smaller than a desired groove width, is mounted on the grindstone rotating shaft. The calculation control means is based on the control for processing the lens surface side groove surface, and the peripheral target lens shape adjacent to the processing control point when assuming the contact state with the groove grindstone of the target lens shape upper groove processing control point. Calculate the biting amount of the groove grindstone at the point, find the biting amount at the peripheral lens shape point where the biting amount is the maximum as the front side maximum biting amount, and similarly for the lens back side groove surface, The control amount in the direction parallel to the lens axis for processing the lens surface side groove surface of the above groove is obtained as the back side maximum bite amount at the peripheral lens shape point where the bite amount is maximum Control of processing the lens surface side groove surface with a control amount obtained by adding the front side maximum bite amount to the front side and the back side maximum bite amount in the control amount in the direction parallel to the lens axis for processing the lens back side groove surface of the groove With the control amount plus It is made to implement the control for processing. According to this structure, the expansion of the bevel groove width resulting from the biting of the groove grindstone generated by the frame shape and the groove curve at the time of grooving can be reduced.

  Further, in the spectacle lens grinding apparatus according to the embodiment of the present invention, the calculation control means is based on the control for processing the lens surface side groove surface, and the contact state of the target lens shape upper grooving control point with the groove grindstone Calculating the amount of biting of the grooved grindstone at the peripheral target lens shape point adjacent to the processing control point when assuming the upper limit, and the biting amount at the peripheral target lens shape point where the biting amount is maximum is the front side Similarly, for the groove surface on the back side of the lens, the amount of biting at the peripheral lens shape point where the amount of biting is the maximum is obtained as the maximum biting amount on the back side, If the sum of the amount and the back side maximum bite amount is greater than the difference between the target groove width and the grooved wheel thickness at the specific lens processing control angle position, the target groove width and the grooved wheel thickness Front side maximum bite amount to be equal to the difference, and After the side maximum bite amount is reduced, the lens surface side groove surface is processed with a control amount that is obtained by adding the front side maximum bite amount to the control amount in the direction parallel to the lens axis for processing the lens surface side groove surface of the groove. And control for processing the lens back side groove surface with a control amount obtained by adding the back side maximum biting amount to the control amount in the direction parallel to the lens axis for processing the lens back side groove surface of the groove. It is made like. According to this structure, the expansion of the bevel groove width resulting from the biting of the groove grindstone generated by the frame shape and the groove curve at the time of grooving can be reduced. Further, it is possible to prevent the occurrence of biting into the reverse surface due to the purpose of reducing the groove width.

23 ... Lens rotation shaft 24 ... Lens rotation shaft 25 ... Lens rotation shaft drive motor (Lens shaft rotation drive means)
32 ... Grinding wheel rotating shaft 35 ... Grinding wheel 38 ... Finishing wheel (bevel wheel)
38a ... Chamfering grindstone 40 ... Groove grindstone 43 ... Inter-axis distance adjusting means 80 ... Arithmetic control circuit (arithmetic control means)
209 ... Tilt motor (Tilt angle adjustment motor)
Fa ... Edge O ... Axis O1 ... Axis P ... Contact Point (Contact Position)
Pf: Lens surface side contact point (contact position)
Pb ... Lens back side contact point (contact position)
ML ... Eyeglass lens MLF ... Eyeglass lens

Claims (4)

A lens rotation shaft provided so as to be able to hold a spectacle lens and capable of movement control in the Z-axis direction which is the lens axis direction by a Z-axis direction drive motor;
Based on the lens shape data (θi, ρi) of the spectacle lens and the radius of the grindstone that grinds the periphery of the spectacle lens, an inter-axis distance Li between the lens rotation axis and the grindstone rotation axis of the grinding wheel is obtained. Calculation is made for each moving radius ρi of the target lens shape data (θi, ρi) to obtain interaxial distance data (θi, Li) composed of the interaxial distance Li and the rotation angle θi, and the interaxial distance data ( Based on θi, Li), the lens shaft rotation drive means is controlled to rotate the lens rotation axis for each rotation angle θi, and the axis distance adjustment means is controlled based on the inter-axis distance data (θi, Li). And a spectacle lens grinding apparatus provided with calculation control means for adjusting the inter-axis distance Li for each rotation angle θi,
The calculation control means includes a chamfering grindstone biting at a peripheral lens shape point adjacent to the processing control point when assuming a contact state with the chamfering grindstone at the end of the spectacle lens edge at the processing control point on the target lens shape. Glasses characterized by calculating the amount and controlling chamfering with a control amount obtained by adding the amount of biting at the peripheral lens shape point where the amount of biting is maximum to the amount of axial control of the lens rotation axis Lens grinding machine. A lens rotation shaft provided so as to be able to hold a spectacle lens and capable of movement control in the Z-axis direction which is the lens axis direction by a Z-axis direction drive motor;
Based on the lens shape data (θi, ρi) of the spectacle lens and the radius of the grindstone that grinds the periphery of the spectacle lens, an inter-axis distance Li between the lens rotation axis and the grindstone rotation axis of the grinding wheel is obtained. Calculation is made for each moving radius ρi of the target lens shape data (θi, ρi) to obtain interaxial distance data (θi, Li) composed of the interaxial distance Li and the rotation angle θi, and the interaxial distance data ( Based on θi, Li), the lens shaft rotation drive means is controlled to rotate the lens rotation axis for each rotation angle θi, and the axis distance adjustment means is controlled based on the inter-axis distance data (θi, Li). And an arithmetic control means for adjusting the inter-axis distance Li for each rotation angle θi,
The grinding wheel has a tapered outer peripheral surface, and the wheel rotation shaft rotates the lens so that the ridge line on the lens rotation shaft side of the grinding wheel is parallel to the axis of the lens rotation shaft. A spectacle lens grinding apparatus inclined by a grinding wheel inclination angle ξ with respect to an axis parallel to the axis of the axis,
The calculation control means includes a bevel lens surface side inclined surface and a lens back surface side at a peripheral lens shape point adjacent to the processing control point when assuming a contact state with the bevel grindstone of the processing control point on the target lens shape. The amount of bite whetstone biting on each inclined surface was calculated, and the biting amount at the peripheral lens shape point where the biting amount was the maximum was added to the distance control amount between the lens rotation axis and the wheel rotation axis. A spectacle lens grinding apparatus characterized by controlling beveling with a control amount. A lens rotation shaft provided so as to be able to hold a spectacle lens and capable of movement control in the Z-axis direction which is the lens axis direction by a Z-axis direction drive motor;
Based on the lens shape data (θi, ρi) of the spectacle lens and the radius of the grindstone that grinds the periphery of the spectacle lens, an inter-axis distance Li between the lens rotation axis and the grindstone rotation axis of the grinding wheel is obtained. Calculation is made for each moving radius ρi of the target lens shape data (θi, ρi) to obtain interaxial distance data (θi, Li) composed of the interaxial distance Li and the rotation angle θi, and the interaxial distance data ( Based on θi, Li), the lens shaft rotation drive means is controlled to rotate the lens rotation axis for each rotation angle θi, and the axis distance adjustment means is controlled based on the inter-axis distance data (θi, Li). And an arithmetic control means for adjusting the inter-axis distance Li for each rotation angle θi,
The grinding wheel has a tapered outer peripheral surface, and the wheel rotation shaft rotates the lens so that the ridge line on the lens rotation shaft side of the grinding wheel is parallel to the axis of the lens rotation shaft. A spectacle lens grinding apparatus tilted by a grinding wheel tilt angle ξ with respect to an axis parallel to the axis of the shaft, wherein the grinding wheel rotating shaft is a grinding wheel for grooving, and the grinding wheel width is smaller than a desired groove width. A ditch grindstone is installed.
The calculation control means is based on the control for processing the lens surface side groove surface, and the peripheral target lens shape adjacent to the processing control point when assuming the contact state with the groove grindstone of the target lens shape upper groove processing control point. Calculate the biting amount of the groove grindstone at the point, find the biting amount at the peripheral lens shape point where the biting amount is the maximum as the front side maximum biting amount, and similarly for the lens back side groove surface, Find the amount of biting at the surrounding target lens shape point where the biting amount is the maximum as the back side maximum biting amount,
Control of processing the lens surface side groove surface with a control amount obtained by adding the front side maximum biting amount to the control amount in the direction parallel to the lens axis for processing the lens surface side groove surface of the groove, and the lens back surface of the groove A spectacle lens grinding apparatus characterized by performing control for processing a lens back side groove surface with a control amount obtained by adding a back side maximum bite amount to a control amount in a direction parallel to a lens axis for processing a side groove surface . 4. The apparatus according to claim 3, wherein the calculation control means is based on a control for processing the lens surface side groove surface, and a processing control point when assuming a contact state of the lens shape upper grooving control point with the groove grindstone. Calculate the amount of biting of the grooved grindstone at the peripheral lens shape point adjacent to the lens, and calculate the amount of biting at the peripheral lens shape point that maximizes the biting amount as the front maximum biting amount. Similarly, for the back side groove surface, the amount of biting at the peripheral lens shape point where the biting amount is maximum is obtained as the backside maximum biting amount, and the front side maximum biting amount and the backside maximum biting amount Is larger than the difference between the target groove width and the thickness of the grooving wheel at the specific lens processing control angle position, the front side is equal to the difference between the target groove width and the thickness of the grooving wheel After reducing the maximum bite amount and backside maximum bite amount, Control of processing the lens surface side groove surface with a control amount obtained by adding the front side maximum biting amount to the control amount in the direction parallel to the lens axis for processing the lens surface side groove surface of the groove, and the lens back surface side groove surface of the groove A spectacle lens grinding apparatus characterized by performing control for processing a lens back side groove surface with a control amount obtained by adding a back side maximum biting amount to a control amount in a direction parallel to the lens axis for processing the lens.

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