JPH11285957A - Method and device for working lens of spectacles - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a proper V-shape formed on a lens to be worked by obtaining a V-shape working data so that an interference between a V-shape formed by a V-shape top locus and a V-shape groove may be made smaller than a specified reference. SOLUTION: Locus data of top point of V-shape applied to a lens to be worked according to a specified program based on an edge position information is obtained. V-shape working locus data is obtained for keeping the V-shape top point as required. Namely, the position where a first V-shape work slant surface V1 and a second V-shape work slant surface V2 are brought into contact with the V-shape top point is obtained, whereby V-shape working data with a distance between a lens rotating shaft rotating the lens to be worked and a rotating shaft of a V-shape working grinding wheel 31 corrected is obtained. According to the V-shape work locus data, rotation and movements in directions X, Z of the lens are controlled to apply V-shape work on the whole periphery of the lens.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyeglass lens processing method and an eyeglass lens processing apparatus for grinding a lens to be processed so as to fit an eyeglass frame.

[0002]

2. Description of the Related Art In order to fit a lens into a spectacle frame, there is known a spectacle lens processing apparatus for forming a bevel on a peripheral portion of a lens with a cylindrical bevel grindstone having a bevel groove.

Conventionally, in this type of apparatus, the bevel vertex locus is determined based on the shape data of the eyeglass frame and the lens edge position, and the bevel groove center of the bevel grindstone is simply made to match the bevel vertex locus. The processing data for was calculated.

[0004]

However, since the bevel apex locus generally has a curve, if the beveling data calculated as described above is machined, the beveled slope of the beveled grindstone is 3 times larger than the expected beveled slope. There is a problem that the vertices actually processed are smaller than expected due to dimensional interference. This interference is particularly large when the curve of the bevel apex locus is tight, and if the formed bevel is too small, a good fit cannot be obtained when the frame is inserted into the spectacle frame.

The present invention has been made in view of the above problems, and provides an eyeglass lens processing method and apparatus capable of appropriately securing a bevel shape to be formed on a lens to be processed and performing processing with a good fit at the time of lens framing. Technical issues.

[0006]

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

(1) A spectacle lens processing method for processing a lens to be processed by a beveling grindstone having a bevel groove,
A bevel trajectory determining step of determining a vertex locus of a bevel to be formed on the lens to be processed, and a beveling process so that interference between the bevel to be formed by the bevel apex locus and the bevel groove is made smaller than a predetermined reference. Beveling data calculation step for obtaining data, a processing control step of controlling processing by the beveling wheel based on the beveling data,
It is characterized by having.

(2) In the beveling data calculation step of (1), the position at which the first beveling slope and the second beveling slope forming the bevel groove of the beveling wheel come into contact with the bevel vertex locus is determined. The bevel processing data is obtained by correcting the position in the direction of the distance between the axis of rotation of the beveling wheel and the axis of rotation of the beveling wheel and the direction of the axis of rotation of the grinding wheel.

(3) The beveling data calculation step of (2) includes a first step of initially setting an inter-axis distance between the lens rotation axis and the front grindstone rotation axis, and the grinding wheel based on the initially set inter-axis distance. The second step of separately obtaining the bevel groove position in the direction of the grindstone rotation axis when the bevel vertex locus in the rotation axis direction and the first and second bevel processing slopes respectively contact each other, and are separately obtained in the second step. A third step of obtaining the difference from the bevel groove position, and a third step of adjusting the inter-axis distance corrected based on the difference between the bevel groove positions in the third step and the bevel groove position in the grindstone rotation axis direction. 4 steps and the first
And a fifth step of obtaining bevel processing data by sequentially repeating steps from step 4 to step 4 corresponding to the rotation angle of the lens to be processed.

(4) In the eyeglass lens processing method of (3), the lens rotation axis and the grindstone rotation axis are arranged in parallel, and the position of each bevel groove in the second step is determined by the first bevel processing. The following equation A expressed as the grinding wheel surface of the slope
And the following Expression B expressed as a grinding wheel surface of the second beveling slope.

(Equation 3)

(5) In the eyeglass lens processing method of (4), the position of each bevel groove in the second step is determined by the expression (x, y, z), the vertex locus data (x _n , y _n , z _n ) (n = 1, 2, 2)
3,... N) to obtain the maximum value of ZT in Expression C and the minimum value of ZB in Expression D.

(Equation 4)

(6) The beveling data calculation step of (3) is performed when the first to fourth steps are repeated according to the rotation angle of the lens to be processed by the fifth step.
The corrected inter-axis distance obtained at the previous rotation angle is set as the inter-axis distance initially set at the next rotation angle.

(7) In the beveling data calculation step (3), the correction determined in the fourth step is performed until the difference between the respective bevel groove positions determined in the third step becomes smaller than a predetermined first reference value. The calculation of the second and third steps is repeated using the inter-axis distance instead of the initially set inter-axis distance.

(8) In the beveling data calculation step of (7), the first reference value is used for the initial rotation angle of the lens to be processed, and the second rotation angle is smaller than the first reference value after the next rotation angle. Is used.

(9) In a spectacle lens processing apparatus for processing a spectacle lens so as to fit a spectacle frame, a grindstone rotation shaft for rotating a beveled grindstone having a bevel groove, and a lens rotation shaft for rotating while sandwiching a lens to be processed. A bevel locus determining means for determining a bevel apex locus formed on the lens to be processed, and a beveling process so as to reduce interference between the bevel to be formed by the bevel apex locus and the bevel groove as compared with a predetermined reference. Beveling data calculation means for obtaining data,
Machining control means for controlling machining by the beveling wheel based on the bevel machining data.

(10) The beveling data calculating means of (9) determines a position when the first beveling slope and the second beveling slope forming the bevel groove of the beveling wheel come into contact with the bevel vertex locus. Based on this, bevel processing data in which the inter-axis direction between the lens rotation axis and the grinding wheel rotation axis and the grinding wheel rotation axis direction are corrected is obtained.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. [Overall Configuration of Apparatus] In FIG. 1, 1 is a main base,
Reference numeral 2 denotes a subbase fixed to the main base 1. 1
Reference numeral 00 denotes an upper portion of the lens chuck, and 150 denotes a lower portion of the lens chuck. Each of the chuck shafts holds a lens to be processed during processing. Further, a lens thickness measuring section 400 is accommodated in the back side of the sub-base 2 below the upper portion 100 of the lens chuck.

Reference numerals 300R and 300L denote lens grinding units having a grinding wheel for lens grinding on each of the rotating shafts.
Each of the lens grinding units 300R and 300L is held movably in the vertical and horizontal directions with respect to the sub-base 2 by a moving mechanism described later. Lens grinding unit 300
As shown in FIG. 2, a rough grinding stone 3
0, a finishing whetstone 31 having a bevel groove is attached. In the bevel groove of this embodiment, the beveled slopes on the front and rear sides of the lens are both at the same angle, and the width of the bevel groove is 4 so as to be suitable for processing a sunglass lens without a bevel shoulder.
mm. A chamfering grindstone 32 for the front surface having a conical surface is mounted on the upper end surface of the finishing grindstone 31, and a chamfering grindstone 33 for the rear surface is coaxially mounted on the lower end surface of the coarse grindstone 30 for plastic. The rotating shaft of the lens grinding unit 300L has a rough grinding wheel 30 for plastic, a mirror finishing wheel 34 having the same bevel groove as the finishing wheel 31, a chamfering wheel 35 for a front mirror surface having a conical surface and a chamfering wheel for a rear mirror surface. 36 are mounted coaxially. These grindstones have a relatively small diameter of about 60 mm to improve machining accuracy and ensure durability of the grindstones.

A display unit 10 for displaying processing information and the like and an input unit 11 for inputting data and instructing the apparatus are provided on the front surface of the housing of the apparatus. Reference numeral 12 denotes an openable and closable door.

[Configuration of Main Parts] <Lens Chuck> FIG.
FIG. 4 is a diagram for explaining a lens chuck lower part 150; A DC motor 103 is mounted on a fixed block 101 fixed to the sub-base 2 by a mounting plate 102. The rotation of the DC motor 103
04, a timing belt 108, and a guide rail which is transmitted to the feed screw 105 via the pulley 107 and is fixed to the fixed block 101 by the rotation of the feed screw 105.
The chuck shaft holder 120 is moved up and down by being guided by the chuck 109. A pulse motor is provided above the chuck shaft holder 120.
The rotation is transmitted to the gear 131, the relay gear 132, and the gear 133, and the chuck shaft 1 is fixed.
21 rotates. Reference numeral 135 denotes a photosensor, and 136 denotes a light shielding plate attached to the chuck shaft 121. The photosensor 135 detects a rotation reference position of the chuck shaft 121.

The lower chuck shaft 152 is a main base 1
The rotation of the pulse motor 156 is transmitted and rotated by a holder 151 fixed to the holder 151. 157
Is a light sensor, 158 is a light shielding plate attached to the gear 155, and the photo sensor 157 is a lower chuck shaft 15
One rotation reference position is detected.

<Moving Mechanism of Lens Grinding Unit> FIG. 4 is a view for explaining the moving mechanism of the lens grinding unit 300R. 201
Is a vertical slide base 201, which can slide up and down along two guide rails 202 fixed to the front surface of the sub-base 2. A U-shaped screw holder 203 is fixed to the side surface of the subbase 2, and a pulse motor 204R is fixed to the upper end of the screw holder 203. A ball screw 2 is provided on the rotation axis of the pulse motor 204R.
When the ball screw 205 rotates, the vertical slide base 201 fixed to the nut block 206 is guided by the guide rail 202 to move up and down. Subbase 2 and vertical slide base
A spring 207 is stretched between itself and the base 201, and the spring 207 urges the vertical slide base 201 upward,
The downward load of the vertical slide base 201 is canceled to facilitate vertical movement. Reference numeral 216R denotes a photo sensor, and 217 denotes a light shielding plate fixed to the nut block 215. The photo sensor 216R detects the position of the light shielding plate 215 and determines a reference position for the vertical movement of the left and right slide base 210.

Reference numeral 210 denotes a left and right slide base to which the lens grinding unit 300R is fixed, and a vertical slide base 20.
It is slidable left and right along two guide rails 211 to which one is fixed. A U-shaped screw holder 212 is fixed to the lower end of the vertical slide base 201, and a pulse motor 214R is mounted on the side of the screw holder 212.
Is fixed, and a ball screw 213 is coupled to the rotation shaft. A nut block 215 is screwed into the ball screw 213.
As shown in FIG. 5, is connected to a protruding portion 210a extending from the lower portion of the left and right slide base 210 by a spring 220. (The mechanism shown in FIG. 5 is stored behind the nut block 215 in FIG. ing). Spring 22
Numeral 0 urges the left and right slide base 210 toward the lens chuck. When the ball screw 213 is rotated by the rotation of the pulse motor 214R and the nut block 215 moves to the left in FIG. 5, the left and right slide base 210 pulled by the spring 220 also moves to the left. If a grinding pressure greater than the urging force of the spring 220 is applied during the processing of the lens to be processed, even if the nut block 215 moves to the left, the left and right slide bases 210 do not move, and the grinding pressure on the lens to be processed is adjusted. You. When the nut block 215 moves to the right in the drawing, the protrusion 210a is pushed by the nut block 215, and the left and right slide base 210 also moves to the right. The photo sensor 221R is attached to the protruding portion 210a, and the photo sensor 221R is mounted on the nut block 215.
The processing end is detected by detecting the light shielding plate 222 fixed to.

The photosensor 216R fixed to the screw holder 212 detects the light-shielding plate 217 fixed to the nut block 215, and
The reference position of the left-right movement of 10 is determined.

The moving mechanism of the lens grinding unit 300L is symmetrical to the moving mechanism of the lens grinding unit 300R, and a description thereof will be omitted.

<Lens Grinding Unit> FIG.
It is a side sectional view showing the composition of 0R. Left and right slide base
A shaft support base 301 is fixed to the shaft 210, and a housing for rotatably holding a vertically extending rotating shaft 304 having a group of grindstones such as the coarse grindstones 30 attached to a lower portion is provided at a front portion of the shaft support base 301. 305 is fixed.
A servo motor 310R is fixed to an upper portion of the shaft support base 301 via a mounting plate 311.
The rotation of the heater 310R is controlled by the pulley 312, the belt 313, the pulley.
The grindstones are transmitted to the rotating shaft 304 via the rim 306 to rotate.

The configuration of the lens grinding unit 300L is the same as that of the lens grinding unit 300R in the left-right symmetry, and a description thereof will be omitted.

<Lens Thickness Measuring Unit> FIG. 7 is a view for explaining the lens thickness measuring unit 400. The lens thickness measuring unit 400 includes:
Measuring arm 52 with two fillers 523, 524
7. A rotating mechanism such as a DC motor (not shown) for rotating the measuring arm 527, a sensor plate 510 for detecting the rotation of the measuring arm 527 and controlling the rotation of the DC motor, and a photo. It comprises switches 504, 505 and a detection mechanism including a potentiometer 506 for detecting the amount of rotation of the measuring arm 527 to obtain the shapes of the front and rear surfaces of the lens.
The configuration of the lens thickness measuring section 400 is basically the same as that of Japanese Patent Application Laid-Open No. Hei 3-20603 filed by the same applicant as the present invention, so please refer to this for details. The lens thickness measuring section 400 shown in FIG. 7 is moved in the front-rear direction (in the direction of the arrow) with respect to the apparatus by the front-rear moving means 630, unlike Japanese Unexamined Patent Publication No. Hei 3-20603. Is controlled based on the data. Further, the measuring arm 527 is rotated upward from the initial position below, and the fillers 523 and 524 are respectively provided on the front refracting surface and the rear refracting surface of the lens.
And the lens arm is measured to measure the lens thickness.
It is preferable to attach a coil spring or the like for canceling the downward load on the rotating shaft.

The measurement of the lens thickness (edge thickness) is performed by moving the lens thickness measuring section 400 back and forth by the forward and backward moving means 630, rotating the measurement arm 527 and bringing the filler 523 into contact with the front refracting surface of the lens. While rotating the lens while obtaining the shape of the front lens refracting surface, the filler 524 is then brought into contact with the rear lens refracting surface to obtain the shape.

<Control Unit> FIG. 8 is a schematic block diagram showing a control system of the apparatus. A control unit 600 controls the entire apparatus, and is connected to the display unit 10, the input unit 11, the microswitch 110, and each photo sensor. Further, motors for movement and rotation are connected via drivers 620-628. Servo motor 310R for lens grinding unit 300R and servo motor for lens grinding unit 300L
The drivers 622 and 625 connected to the motor 310L detect the amount of rotation torque of the servo motors 310R and 310L during machining, respectively, and feed back to the control unit 600. The control unit 600 transmits this information to the lens grinding unit 300R,
It is used for 300L movement control and lens rotation control.

Reference numeral 601 denotes an interface circuit used for transmitting and receiving data.
(See Japanese Patent Application Laid-Open No. 4-93164), a computer 651 for managing lens processing information, and a barcode scanner 65.
2 etc. can be connected. 602, a main program memory in which a program for operating the apparatus is stored;
Reference numeral 03 denotes a data memory for storing input data, lens thickness measurement data, and the like.

The operation of the apparatus having the above configuration will be described. Here, a non-degree sunglass lens is taken as an example of the lens to be processed, its thickness is 2.2 mm, and it is assumed that no bevel shoulder is required.

First, the processor is required to measure the shape of the lens frame shape 65.
The frame data measured by 0 is transferred to the interface circuit 60.
1 to the apparatus body side The input data is transferred to and stored in the data memory 603, and the display unit 10 displays a lens shape based on the frame data. After inputting processing conditions such as lens material, frame material, and processing mode by a switch of the input unit 11, the processor chucks the processed lens on which predetermined processing has been performed by the chuck shafts 121 and 152, and sets a start switch. Press to operate device.

The control section 600 operates the lens thickness measuring section 400 and the forward / backward moving means 630 in response to the input of the start signal, and obtains edge position information based on the radial information of the frame data.
Then, the locus data (r _{s) of the} bevel vertex to be applied to the lens according to a predetermined program based on the obtained edge position information
δ _n , r _s θ _n , z _n ) (n = 1, 2, 3,... N). With respect to the calculation of the bevel apex locus, a method of obtaining a curve value from the front curve and the rear curve, a method of dividing the edge thickness, a method of combining these, and the like have been proposed. For example, Japanese Patent Laid-Open No. 5-2 by the same applicant as the present invention.
No. 12661, etc., refer to this. Here, since a non-degree sunglass lens is taken as an example, the bevel apex is positioned at the center of the lens edge thickness in order to make the bevel state look good.

When the trajectory data of the bevel apex is obtained, the bevel processing trajectory data for securing the bevel apex as scheduled is obtained. Hereinafter, this calculation will be described.

Since the three-dimensional interference of the bevel groove of the finishing grindstone 31 with the bevel vertex locus occurs for each of the upper slope V1 and the lower slope V2 (see FIG. 9) forming the bevel groove, the upper slope V1 and the lower slope V2 are formed. Separately consider the interference of the bevel vertex locus due to.

Now, as shown in FIG. 9, an XYZ coordinate system in which the left-right direction with respect to the apparatus is the X axis, the front-rear direction is the Y axis, and the lens rotation axis direction is the Z axis with reference to the lens rotation axis. At this time, the grindstone surface formed by the upper slope V1 and the lower slope V2 is expressed by the following equations 1 and 2, respectively.

(Equation 5)

Here, X is the distance between the lens rotation axis and the grinding wheel rotation axis in the X axis direction, Y is the distance between the lens rotation axis and the grinding wheel rotation axis in the Y axis direction, and Z is the Z axis direction. The height is assumed to be the height of a virtual vertex of the upper slope V1 and the lower slope V2 with respect to the reference position. [psi ₁ is an inclined angle of the upper inclined surface V1 with respect to the Z-axis direction, [psi ₂ is the angle of inclination of the lower slope V2 with respect to the Z-axis direction.

Equations 1 and 2 are modified so that the virtual vertex height of the upper slope V1 is ZV1 and the virtual vertex height of the lower slope V2 is ZZ1.
Assuming V2,

(Equation 6) Becomes

Next, when obtaining the interference of the bevel vertex locus by the upper slope V1 and the lower slope V2, as shown in FIG. 10, the center height of the bevel groove on the upper slope V1 side is ZT, the lower slope V is lower.
The bevel groove center heights on the two sides are separately considered as ZB.
At this time, the distance difference between ZT and ZV1 is C ₁ , ZB and ZV2
Assuming that the distance difference from CT is C ₂ , ZT and ZB are

(Equation 7) Becomes Further, the above distance differences C ₁ and C ₂ are determined by
R, the radius of b ₁ a groove spacing of the upper slope V1 side with respect to the V-shaped groove center, if the groove spacing of the lower slope V2 side with respect to the V-shaped groove centered b _2, is expressed by the following equation.

(Equation 8)

In this embodiment, since both ψ ₁ and ψ ₂ have the same angle, this is set to ψ and b ₁ and b ₂ are also the same, so that C ₁ and C ₂ are also the same, C. Further, in this embodiment, since Y = 0, Equations 5 and 6 are expressed as follows.

(Equation 9)

The bevel machining trajectory data is obtained by substituting the trajectory data of the apex of the zenith into (x, y, z) in the above equations 9 and 10 to obtain the maximum value of ZT and the minimum value of ZB. The amount of movement of the grinding wheel rotation axis in the X direction (the distance between the lens rotation axis and the grinding wheel rotation axis) by calculating the trajectory based on the trajectory.
And the center height of the bevel groove in the Z direction is calculated.

This calculation procedure is performed as follows (FIG. 11,
FIG. 12 is a flowchart). Incidentally, the bevel apex path data _{(r s δ n, r s} θ n, z n) is converted from a polar coordinate system into an orthogonal coordinate system _{(x n, y n, z} n) (n = 1,2,3,
... N) are used.

First, the value of X for the first point of the bevel vertex locus (the rotation start point of the bevel vertex locus) is temporarily determined. For example, the radial distance information of the bevel apex trajectory is a two-dimensional distance between the axes when the finishing grindstone 31 (which may be considered as the center of the bevel groove) is in contact.

Next, the gene vertex locus data (x _n , y _n , z _n ) (n = 1, 2, 2, 3) is added to (x, y, z) in Expressions 9 and 10.
3,... N) and the maximum value ZT of the machining start point
T _max and ZB minimum value ZB _min of each calculated, and the difference [Delta] Z,

(Equation 10) Ask for. From this ΔZ, the correction amount ΔX in the lens radial direction is obtained by using the following equation (of course, when ΔZ is minus, ΔX also becomes minus).

[Equation 11]

The obtained ΔX is added to the previously used X, and
ZT _max and ZB _min are calculated again with the newly obtained corrected X, and the difference ΔZ is obtained. From this, the calculation of ΔX and the calculation of a new corrected X by adding ΔX to the immediately preceding X are repeated, and the magnitude of ΔZ is finally smaller than a certain reference value (this is referred to as a first reference value). , For example, 0.005m
m). The final corrected X at this time is defined as a value in the radial direction (X direction) at the processing start point,
Although the difference between the final ZT _max and ZB _min is sufficiently small in the Z direction, the midpoint is set as the value in the Z direction.

Next, the trajectory of the bevel vertex is rotated about the lens rotation axis by a small arbitrary angle, and assuming that the value of X is equal to X at the previous rotation angle, ZT _max and ZB _min
Is calculated, and ΔZ of the difference is obtained. From this, the X direction is corrected using Expression 12. The above calculation is repeated until the magnitude of ΔZ at this time becomes equal to or less than a certain reference value which is looser than the first reference value (this is referred to as a second reference value, for example, 0.03 mm). When the magnitude of ΔZ becomes equal to or less than the second reference value, the values in the X direction and the Z direction are calculated as described above.

Thereafter, referring to the immediately preceding X, the rotation angle of the coordinates of the trajectory of the bevel apex is set to ξ _i (i = 1, 2, 3,...).
N), and the values in the X and Z directions are calculated over the entire circumference. In this case, it is better that the machining start point and the end point of the bevel machining path do not greatly differ from each other.
It is also effective to gradually bring the reference value to the first reference value.

According to the above procedure, each ξ _i
The X-direction value Xi, the value of the Z-direction and Zi in beveling path data _{(X i, Z i, ξ} i) (i = 1,2,3,
... N) are obtained. Processing data is stored in data memory 603
Is stored.

The reason why the second reference value is made looser than the first reference value is to shorten the calculation time.
If this value is about 0.03 mm, there is almost no case where re-correction calculation is required, and it has been confirmed that the portion where interference has occurred conventionally has been dramatically improved. With respect to the portion that does not cause interference, the bevel apex locus can be almost accurately secured by the correction of Expression 12.

When bevel processing data is obtained as described above, the control section 600 performs rough processing based on the processing information for rough processing. The control unit 600 includes the servo motor 3
10R and 310L are driven to drive the lens grinding units 300R and 3R.
The 00L wheels are rotated. Also, the left and right slide bases 210 are moved down by driving the left and right pulse motors 204R and 204L so that the left and right coarse grinding wheels 30 are both at the height of the lens to be processed. After that, the pulse motors 214R and 214L are rotated and the lens grinding unit 3 is rotated.
00R and 300L are slid toward the lens to be processed, and the upper and lower pulse motors 130 and 15 are moved.
6, the lens to be processed chucked by the chuck shafts 121 and 152 is rotated. The left and right coarse grinding stones 30 move toward the lens to be processed while rotating, thereby gradually grinding the lens from two directions. Coarse whetstone 30
Of the lens to the lens side is independently controlled on the left and right sides based on the processing data.

When the rough processing is completed, the process proceeds to the finishing processing using the finishing whetstone 31. After the control unit 600 separates both the coarse grindstones S0 from the lens to be processed by the moving mechanism of the lens grinding unit, the lens is adjusted so that the center height of the bevel groove of the finishing grindstone 31 becomes the height position of the bevel vertex locus at the start of processing. Grinding unit 300
Move R. Thereafter, the finishing grindstone 31 is moved in the lens direction to start the processing, and the rotation, the movement in the X direction and the movement in the Z direction of the lens are controlled based on the bevel processing locus data, so that the bevel is formed on the entire periphery of the lens to be processed. Perform processing. By the processing control according to the above-described bevel processing locus data, a bevel in which a predetermined bevel apex locus is secured is formed on the lens to be processed. Thereby, the fit of the bevel at the time of framing is improved.

In the above, the case of the lens to be processed which does not require the formation of the bevel shoulder has been described as an example. By applying the same method to a lens which forms the bevel shoulder, the bevel can be formed with the bevel apex secured. . However, in this case,
Where the degree of three-dimensional interference due to the inclined surface of the bevel groove is large, the diameter of the bevel shoulder portion is formed larger accordingly. As a countermeasure, the bevel apex position in the radial direction can be adjusted according to the degree of the bevel shoulder, for example, by setting the bevel apex position when the bevel is formed by the conventional method and about half the position when the bevel apex is secured. Good. By doing so, it is possible to improve the fit to the spectacle frame as compared with the case where no adjustment is made, and to reduce the influence of the appearance due to the change in the bevel shoulder.

It is also effective to suppress the change in the size of the portion where the bevel shoulder is formed larger by chamfering. For chamfering, chamfering whetstone 3 for front
Processing is performed using a chamfering grindstone 33 for 2 and a surface. This chamfering method is described in Japanese Patent Application No.
No. 41377 can be used.

[0055]

As described above, according to the present invention,
By obtaining the bevel processing data in consideration of the three-dimensional interference between the inclination of the bevel groove and the lens to be processed, the bevel apex formed on the lens to be processed can be appropriately secured. As a result, it is possible to improve the fit of the lens frame.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of an apparatus according to the present invention.

FIG. 2 is a diagram showing a configuration of a grindstone.

FIG. 3 is a diagram illustrating a configuration of an upper portion and a lower portion of a lens chuck.

FIG. 4 is a diagram illustrating a moving mechanism of a lens grinding unit.

FIG. 5 is a diagram illustrating a left and right movement of a lens grinding unit and a processing end detection mechanism.

FIG. 6 is a side sectional view illustrating a configuration of a lens grinding unit.

FIG. 7 is a diagram illustrating a lens thickness measurement unit.

FIG. 8 is a schematic block diagram showing a control system of the apparatus.

FIG. 9 is a diagram illustrating a coordinate system for explaining interference between a bevel vertex locus and a bevel groove.

FIG. 10 is a diagram separately showing the center height of the bevel groove on the upper slope side of the bevel and the center height of the bevel groove on the lower slope side of the bevel.

FIG. 11 is a flowchart illustrating a calculation procedure of bevel processing locus data calculation.

FIG. 12 is a flowchart illustrating a calculation procedure of bevel processing locus data calculation.

[Explanation of symbols]

 31 Finishing grindstone 121, 151 Chuck shaft 300R, 300L Lens grinding unit 600 Control unit 650 Lens frame shape measuring device V1 Upper slope V2 Lower slope

Claims (10)

[Claims] An eyeglass lens processing method for processing a lens to be processed with a beveled grindstone having a bevel groove, a bevel path determining step of determining a vertex locus of a bevel to be formed on the lens to be processed, and a step formed by the bevel vertex locus. A beveling data calculation step for obtaining beveling data so as to reduce interference between a bevel to be formed and the bevel groove, as compared with a predetermined reference; and a process for controlling processing by the beveling grindstone based on the beveling data. And a control step. 2. The beveling data calculating step according to claim 1, wherein a position at which the first beveled slope and the second beveled slope forming the bevel groove of the beveled wheel contact the bevel vertex locus is determined. An eyeglass lens processing method, wherein bevel processing data is obtained by correcting a position in a direction of a distance between an axis of rotation of a lens to rotate a lens to be processed and a rotation axis of a grinding wheel of the beveling wheel and a direction of a rotation axis of the grinding wheel. 3. The bevel processing data calculating step according to claim 2, wherein a first step of initially setting an inter-axis distance between the lens rotation axis and the front grindstone rotation axis, and the grinding wheel rotation based on the initially set inter-axis distance. A second step of separately obtaining a bevel groove position in the direction of the grinding wheel rotation axis when the bevel vertex locus in the axial direction and the first and second beveling slopes respectively contact each other;
A third step of obtaining the difference from the bevel groove positions separately obtained in the steps, a corrected inter-axis distance corrected based on the difference in the bevel groove positions in the third step, and a bevel groove in the direction of the grinding wheel rotation axis. A fourth step of adjusting the position, and a fifth step of obtaining the beveled data by sequentially repeating the first to fourth steps in accordance with the rotation angle of the lens to be processed. Eyeglass lens processing method. 4. The eyeglass lens processing method according to claim 3, wherein the lens rotation axis and the grindstone rotation axis are arranged in parallel, and the position of each bevel groove in the second step is the first bevel processing slope. Formula A expressed as the grinding wheel surface of
A spectacle lens processing method using the following formula B expressed as a grinding wheel surface of a second beveling slope. (Equation 1) 5. The eyeglass lens processing method according to claim 4, wherein the position of each bevel groove in the second step is determined by (x, y, z) of the following expressions C and D obtained by expanding the expressions A and B. ) in Gen apex path data _{(x n, y n, z} n) (n = 1,2,
3,... N) to obtain and obtain the maximum value of ZT in equation C and the minimum value of ZB in equation D. (Equation 2) 6. The bevel processing data calculation step according to claim 3, wherein the first to fourth steps are repeated according to the rotation angle of the lens to be processed by the fifth step, with the previous rotation angle. A method for processing a spectacle lens, characterized in that the determined inter-axis distance is used as an inter-axis distance initially set at the next rotation angle. 7. The bevel processing data calculating step according to claim 3, wherein the correction axis obtained in the fourth step is performed until the difference between the respective bevel groove positions obtained in the third step becomes smaller than a predetermined first reference value. A method of processing a spectacle lens, wherein the distances are used in place of the default distance between axes, and the calculations in the second and third steps are repeated. 8. The beveling data calculation step according to claim 7, wherein the first reference value is used for an initial rotation angle of the lens to be processed, and the second rotation angle is smaller than the first reference value after the next rotation angle. An eyeglass lens processing method using a reference value. 9. A spectacle lens processing apparatus for processing a spectacle lens to fit a spectacle frame, comprising: a grindstone rotation axis for rotating a beveled grindstone having a bevel groove; a lens rotation axis for rotating while holding a lens to be processed; Bevel locus determining means for determining a bevel vertex locus to be formed on the lens to be processed; and bevel processing data such that interference between the bevel to be formed by the bevel vertex locus and the bevel groove is made smaller than a predetermined reference. A spectacle lens processing apparatus, comprising: a beveling data calculating means for obtaining a value; and a processing control means for controlling processing by the beveling wheel based on the beveling data. 10. The beveling data calculating means according to claim 9, based on obtaining a position when a first beveling slope and a second beveling slope forming a bevel groove of the beveling wheel are in contact with the bevel vertex locus. An eyeglass lens processing apparatus, wherein bevel processing data in which a direction between the lens rotation axis and the grinding wheel rotation axis and a direction of the grinding wheel rotation axis are corrected is obtained.