JPH0818237B2 - Edge processing machine for eyeglass lens and beveling method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rim processing machine for eyeglass lenses and a bevel processing method, and in particular, it is possible to easily know the finished image of the bevel during the trial run of the bevel processing operation. The present invention also relates to a rim processing machine for eyeglass lenses and a bevel processing method that can easily change the position of the bevel.

[Conventional technology]

In order to fit the spectacle lens to the rim that is the lens frame of the spectacle frame, the outer peripheral shape of the spectacle lens was cut into a shape corresponding to the shape of the inner peripheral groove of the rim (roughing) using a ball grinding machine. After that, a mountain-shaped protrusion band called a bevel is formed by cutting on the entire periphery of the spectacle lens,
The beveled part fits the spectacle lens to the rim. The bevel processing includes free bevel processing that appropriately processes a bevel curve (bevel curvature) and forced bevel processing that forms the bevel curve so as to match the curvature of the inner circumference of the rim of the spectacle frame as much as possible. In free-beveling, the curvature of the inner circumference of the rim of the spectacle frame is corrected according to the bevel curve and the framing is done, so it is easy to do with a spectacle lens with a relatively low frequency and a thin peripheral edge (edge thickness). Since this method is often adopted. On the other hand, a high-power lens, for example, a special spectacle lens such as an astigmatic lens or a multifocal lens, has a thick peripheral edge, so it is difficult to frame it by free-beveling.
For cosmetic reasons, forced beveling is used.

Next, the forced bevel processing method will be described. In forced bevel machining, a trial rub is first performed to confirm the bevel position, and then a finish rub is performed. Trialing is a cutting operation that plays an auxiliary role in determining the bevel position and the bevel curve in consideration of the shape and peripheral thickness of the lens to be cut. By trial-slicing, the bevel position and the bevel curve are preliminarily processed on the lens periphery, and the image of the finished peripheral surface can be roughly grasped. If the operator inputs the data of the bevel position and the bevel curve to the ball-slicing machine and makes a trial run, and determines that the bevel position and the bevel curve processed on the lens peripheral surface by the trial run are not good, the same result is obtained again. Perform the operation, and if the bevel position and bevel curve that you think are good are obtained, finish the finishing. Normal trial is 1
It can be done ~ 3 times.

The trial printing of the conventional beveling method will be specifically described with reference to FIG. In FIG. 11, 100 is a cross section showing the peripheral portion of the spectacle lens. Reference numeral 101 denotes an outermost peripheral edge surface of the lens after rough rubbing, 102 a peripheral edge surface of the lens when trial sliding is performed, and 103 a final peripheral edge surface of the finished lens after finish sliding. Each of the trial-rimmed lens peripheral surface 102 and the finish-polished lens peripheral surface 103 has a bevel 10
4,105 are formed. Therefore, if the beveling is performed, the lens peripheral surface 102 is first formed by trial sliding,
After that, while observing the position of the bevel 104, the lens peripheral surface 103
Assuming the position of the bevel 105 in, the finishing scraping will be performed.

As is clear from FIG. 11, in the conventional bevel processing method,
The apex of the bevel 105 on the lens peripheral surface 103 and the apex of the bevel 104 on the lens peripheral surface 102 are located on the straight line 106, and X
It is at the same position in the axial direction. On the other hand, the lens 100
For example, in the case of a minus lens, the thickness becomes thinner from the outer edge toward the center.
The position of 04 and the position of the bevel 105 on the lens peripheral surface 103 are different. The procedure for making the bevel 104 having such a positional relationship is as follows. In the following description, points A _{0 to} A ₂ , B _{0 to} B ₂ , C ₀ to represent the predetermined positions in FIG. 11, respectively.
C ₃ , D ₀ , D ₂ , E ₀ , E ₂ are used.

(1) In the spectacle lens 100 after roughing, the positions of A ₁ and B ₁ are measured in order to obtain the position of the bevel 105 and the bevel curve on the peripheral surface 103 of the finished lens. The dotted line 107 determined by A ₁ and B ₁ is a line representing the beveled surface, and the apex of the beveled peak exists on this line. Based on this measurement, the surface curve value, the back surface curve value of the spectacle lens 100, the vertex C ₁ of the bevel 105 in the finished state, the center of curvature of the front surface, and the center of curvature of the back surface are further calculated.

(2) Any point based on A ₁ and B ₁ obtained in (1) above
Find A ₂ and B ₂ . The conditions for obtaining A ₂ and B ₂ are as follows.

The line segment A ₁ B ₁ and the line segment A ₂ B ₂ are parallel. A ₂ and B ₂ are located on the outer edge side of A ₁ and B ₁ .

A ₂ is on the front curve and B ₂ is on the back curve.

(3) Find C ₃ . This C ₃ is the apex position of the bevel in trial printing. The conditions for obtaining C ₃ are as follows.

It is on an extension of line segment C ₀ C ₁ .

When an intersection between the line segment C ₀ C ₁ and the segment A ₂ B ₂ and C _2, Is.

Corresponds to the height of the bevel and is a constant value.

(4) Find D ₂ and E ₂ . To find this, first C ₀ ,
Find D ₀ , E ₀ . The height of the bevel is a constant value given in advance. Therefore, C ₀ can be obtained by giving a predetermined bevel height perpendicular to the line segment A ₁ B ₁ and passing through C ₁ .

Corresponds to the width of the bevel and is a constant value given in advance.
Further And ∠ D ₀ C ₁ E ₀ is defined as a constant angle (angle of the beveled mountain). Due to these conditions, D ₀ , E ₀
Is found. Next, find D ₂ and E ₂ . Since D ₀ and E ₀ are obtained by the above processing, the point where a straight line parallel to the line segment C ₀ C ₁ and passing through the point D ₀ intersects the line segment A ₂ B ₂ is D ₂ . Also, the line segment C ₀
The straight line that is parallel to C ₁ and passes through E becomes the point where the line segment A ₂ B ₂ intersects E _{2 As described} above, the position of the bevel in the trial run (△ D ₂ C
₃ E ₂ ) is obtained, the X-axis direction motor and the Y-axis direction motor of the ball slide machine are controlled by using this data, and the beveling is performed in trial sliding.

The beveling of the trial is performed, and the finished lens peripheral surface 10
After the position of the bevel 105 in 3 is roughly assumed, the lens peripheral surface 102 is kept with the position of the bevel 104 unchanged.
Finishing rub is performed on the peripheral surface 103 and the bevel 105 of the finished lens. In this way, the forced beveling process is completed.

[Problems to be Solved by the Invention]

The conventional beveling method described above poses the following problems. When the trial printing is performed 1 to 3 times, in the case of the minus lens, the thickness of the lens is gradually reduced, and thus the peripheral thickness of the lens is reduced. As the peripheral edge thickness becomes smaller, the positions of both edges forming the lens peripheral surface will change because the front and back surfaces of the lens are curved. On the other hand, in the conventional bevel processing method, the position of the bevel is fixed. Therefore, the bevel position in the peripheral surface width direction of the lens peripheral portion changes each time the trial printing is performed. Therefore, the operator cannot see the state of the finished surface in the trial-sliding stage, and must predict the bevel position in the finish-sliding based on the bevel position in the trial-sliding. This task required considerable experience and was difficult for unskilled persons. In the case of a plus lens, the change in peripheral thickness is opposite, but the same problem occurs.

Also, in the beveling method, there may be cases where you want to freely change the position where the bevel is placed during trial machining depending on the type of spectacle lens and lens thickness, but with the conventional method it is difficult to grasp the image on the finished surface. However, there is a problem that it is difficult to arbitrarily change the bevel position and finely adjust the position.

An object of the present invention is to provide a rim processing machine for a spectacle lens and a bevel processing method capable of easily knowing the position of the bevel on the finished lens peripheral surface from the bevel position in the trial laying, and also easily changing the bevel position in the trial laying. To provide.

[Means for solving the problem]

A spectacle lens peripheral processing machine according to the present invention includes a holding mechanism that holds a spectacle lens rotatably, a head that houses the holding mechanism and is attached at least horizontally so that the head moves horizontally. A horizontal driving device for moving, a cutting member for cutting the peripheral portion of the spectacle lens, and a peripheral measuring device for measuring the peripheral portion of the spectacle lens are provided, and the spectacle lens and the cutting member rotate in contact with each other, and the spectacle lens A peripheral edge processing machine for an eyeglass lens that processes the entire peripheral edge of the eyeglass lens, and measures the peripheral edge thickness on the beveled surface with a peripheral edge measuring device at each of a plurality of predetermined locations that determine the bevel curve in the peripheral edge of the eyeglass lens. And a value of the ratio representing the bevel position corresponding to the measured peripheral thickness at at least one arbitrary position among the plurality of predetermined positions. Ratio setting means, a bevel position deciding means for deciding a bevel apex position on the peripheral surface of the finished lens based on the value of the ratio at the arbitrary position, and a horizontal drive device for horizontally moving the head and the spectacle lens. And a beveling processing control means for performing at least trial running while changing the bevel apex position so that the value of the ratio corresponding to the lens peripheral surface at the lens peripheral surface at the arbitrary position is always satisfied. To be done.

A first spectacle lens beveling method according to the present invention is
To fit the spectacle lens to the lens frame of the spectacle frame,
In a beveling method for forming a bevel by carrying out trial sliding and finish sliding on the entire peripheral portion of the spectacle lens after roughing processing, in at least one arbitrary position of the peripheral portion of the spectacle lens, Measure the peripheral edge thickness on the beveled surface, set the value of the ratio that represents the bevel position corresponding to the measured peripheral edge thickness, and determine the bevel apex position on the peripheral edge surface of the finished lens based on the ratio value. The feature is that trial sliding and finishing sliding are performed while changing the bevel apex position so that the value of the ratio is always satisfied on the lens peripheral surface.

A second spectacle lens beveling method according to the present invention is
To fit the spectacle lens to the lens frame of the spectacle frame,
A beveling method for forming a bevel by performing trial-polishing and finish-polishing on the entire peripheral portion of a spectacle lens after rough machining, comprising the bevel of the spectacle lens at at least one arbitrary location on the peripheral portion of the spectacle lens. The peripheral edge thickness on the finished surface is measured, a ratio value representing the bevel position corresponding to the measured peripheral edge thickness is set, and the first bevel apex position on the peripheral edge surface of the finished lens is determined based on the value of the ratio. The second bevel apex position on the peripheral surface of the trial lens is determined based on the value of the ratio, and the bevel apex is formed along a straight line connecting the first and second bevel apex positions on the peripheral surface of the lens at an arbitrary position. The feature is that trial sliding and finishing sliding are performed while changing the position.

A third spectacle lens beveling method according to the present invention is
To fit the spectacle lens to the lens frame of the spectacle frame,
A beveling method for forming a bevel by performing trial-polishing and finish-polishing on the entire peripheral portion of a spectacle lens after rough machining, comprising the bevel of the spectacle lens at at least one arbitrary location on the peripheral portion of the spectacle lens. The peripheral edge thickness on the finished surface is measured, a ratio value representing the bevel position corresponding to the measured peripheral edge thickness is set, and the first bevel apex position on the peripheral edge surface of the finished lens is determined based on the value of the ratio. The second bevel apex position on the peripheral edge surface of the trial lens is determined based on the value of the ratio, and the bevel apex is formed along the straight line connecting the first and second bevel apex positions on the lens peripheral surface at the arbitrary position. The feature is that trial sliding and finishing sliding are performed while changing the position.

[Action]

In the peripheral processing machine of the spectacle lens according to the present invention, at least the trial sliding of the forced beveling and the finishing sliding, the apex position of the bevel formed on the peripheral portion of the spectacle lens is a ratio value determined by each lens peripheral portion. Based on the above, the horizontal movement device that moves the spectacle lens in the horizontal direction is controlled so that it is always positioned at a fixed position in the width direction on the lens peripheral surface. The value of the ratio that determines the apex position of the bevel in each lens peripheral portion is measured by measuring the lens peripheral thickness at the bevel finished surface at an arbitrary position of the lens peripheral portion with a peripheral measuring device, and measuring the peripheral thickness obtained by this measurement. According to the determined bevel curve, it is automatically set in the non-measurement section. In the beveling, in order to form the bevel apex position of the lens peripheral surface on the trial run at a position satisfying a predetermined ratio determined corresponding to each peripheral portion, in each lens peripheral portion, the spectacle lens is The position of the spectacle lens is moved in the horizontal direction according to a required reference each time it is rotated, the cutting position by the cutting member is moved, and the apex position of the bevel is changed.

In the beveling method for a spectacle lens according to the present invention, it is premised that the beveling method is a forced beveling method, in which trial sliding and finishing sliding are performed, and first, at least one predetermined lens peripheral portion The position of the bevel on the peripheral edge of the lens is determined by measuring the peripheral thickness of the beveled surface of the peripheral edge of the lens and setting the ratio value corresponding to this peripheral thickness. And, when performing finishing shaving, while changing the apex position of the bevel so that the apex position of the bevel becomes a constant position in the width direction of the lens peripheral surface according to the value of the obtained ratio at the predetermined lens peripheral part. Beveling is performed. Further, in the actual bevel processing method, it is desirable to perform approximation calculation using a straight line in consideration of the performance of a computer controlling the processing operation. The straight line used for the approximate calculation is obtained by using the bevel apex position on the peripheral surface of the finished lens and the bevel apex position on any other peripheral surface of the lens. In the second beveling method, a straight line is obtained by using the bevel apex position on the peripheral surface of the trial-driving lens, and in the third bevel processing method, the bevel apex position on the peripheral surface of the rough-polishing lens is used. I tried to find a straight line.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a perspective view of a main part of an internal structure of a spectacle lens grinding machine for carrying out a beveling method according to the present invention, that is, a ball shaving machine. In FIG. 1, a diamond wheel 1 which is a rotary cutting wheel receives power by a power transmission mechanism of a pulley 3 and a belt 4 by a main motor (not shown), and the diamond wheel 1 rotating via a spindle 5 is attached to an eyeglass lens 6. The spectacle lens 6 is cut under pressure. The spectacle lens 6 includes a lens pressing shaft 7 and a lens supporting shaft 8.
It is held in place by. The lens pressing shaft 7 can move in the axial direction by transmitting the rotation of the chucking motor 9 via the belt 10 and the pulley 11 and rotating and feeding the feed screw 12. This allows the spectacle lens 6 to be attached and detached.

The rotation of the spectacle lens 6 is performed by the synchronous rotation of the lens pressing shaft 7 and the lens supporting shaft 8. The lens holding shaft 7 and the lens supporting shaft 8 are rotated by a lens motor 13 and gears 14 and 15, and an interlocking shaft 16 is rotated. Pulleys provided at both ends of the interlocking shaft 16
A power transmission mechanism of 17 and a belt 18 wound around the belt 17 is rotated via a pulley 19.
A homer 20 for giving a lens pattern and a raw round spectacle lens 6 are attached to both ends of a lens support shaft 8. The lens support shaft 8 is interlocked with the encoder 23 via gears 21 and 22, whereby the rotation angle of the lens support shaft 8 is measured.

Reference numeral 24 denotes a head, and the head 24 houses the motors 9 and 13 and their associated power transmission mechanisms, the lens pressing shaft 7 and the lens supporting shaft 8. The spectacle lens 6 is arranged in the center of a recess formed in front of the head 24. The spectacle lens 6
The head 24 descends by swinging around the slide shaft 25 as shown by an arrow L1, and the head 24 is pressed against the diamond wheel 1 by its own weight and cut. Slide shaft 25
Are rotatably and axially slidably supported by slide bearings 27 held by two bearing pedestals 26, respectively. A gear 28 is attached to the right end in the figure of the slide shaft 25 to which the head 24 is fixed.
The gear meshed with the gear 28 operates the pontentiometer 29, whereby the distance from the center of rotation of the diamond wheel 1 to the center of the spectacle lens 6 can be measured. The potentiometer 29 is mounted on a mount 31 slidably supported by a slide rod 30. The gantry 31 is fixed to the slide shaft 25, and the potentiometer 29 is movable together with the slide shaft 25.

A bearing 32 is fitted to the right end of the slide shaft 25 in the figure so as to be rotatable relative to the slide shaft 25, and an arm 33 is fixed to the bearing 32 near its rear end. A belt 34 is stretched in parallel with the slide shaft 25 between a pulley 35 and a pulley 37 of an electromagnetic clutch 36.
The rear end of the arm 33 is fixed to the belt 34 by a fixing plate 38. The electromagnetic clutch 36 is interlocked with the pulse motor 41 via gears 39 and 40. By operating the pulse motor 41 based on this structure, the slide shaft 25 and the head 24 move in the axial direction of the slide shaft 25, that is, in the X-axis direction (horizontal direction) as indicated by arrow L2.

A holding table 42 is fixed to the front end of the arm 33.
A profile plate 43 having a surface with the same radius of curvature as the diamond wheel 1 is fixed to 42. Since the arm 33 moves as described above, the roller 45 is provided between the holding table 42 and the lifting table 44 of the support mechanism provided below the holding table 42 to support the holding table 42, and the roller 45 is mounted on the lifting table 44. Holding table via roller 45
42 is slippery. On both sides of the profile plate 43, a large number of pairs of optical fibers 46 are formed at equal intervals along the peripheral surface thereof.
One end of each is opposed to each other.

FIG. 3 shows the arrangement of the optical fibers 46 in detail. The other end of one of the pair of optical fibers 46, 46 is a light emitting element 47.
And the other end of the other optical fiber is arranged to face the light receiving element 48. As a result, at the opposite ends of the optical fibers 46 of each pair, the light from the light emitting element 47 at one end is emitted toward the other end on the peripheral surface of the follower plate 43 and receives this light. The optical fiber transmits light to the light receiving element 48.

The head 24 descends due to the rotation of the slide shaft 25, and the homer 20 contacts at one point on the peripheral surface of the follower plate 43. By this point contact, the light of a pair of optical fibers 46 is blocked,
The associated light receiving element 48 is in a non-excited state. From the position of the non-excitation light receiving element 48, the angle of the contact point on the peripheral surface of the homer 20 and the follower plate 43 can be measured. The angle of the contact point is the center O _{1 of the} homer 20 and the contact plate 43 as shown in FIG.
Is defined with respect to a straight line connecting the center of curvature O _{2 of,} and α in FIG. 5 is the rotation angle of the homer 20, and θ is the follower plate 43 on the homer.
20 is the contact angle.

Further, in FIG. 1, 49 is a pulse motor in the Y-axis direction (vertical direction) as indicated by an arrow L3, and by operating the pulse motor 49, the lifting table 44 can be vertically moved up and down. When the elevating table 44 is moved up and down, the head 24 can be moved around the slide shaft 25 via the arm 33 and the slide shaft 25 as shown by an arrow L1. Reference numerals 50 and 51 are guide members for supporting the lifting motion of the lifting platform 44.

In the above, the head 24 is moved horizontally by the pulse motor 41 and vertically by the pulse motor 49. By moving the head 24 in the horizontal direction or the vertical direction in this manner, the position of the spectacle lens 6 to be processed is arbitrarily changed in the horizontal direction, and the spectacle lens 6 is brought into contact with or separated from the diamond wheel 1. You can

The diamond wheel 1 has a cylindrical shape, and its peripheral surface is formed as a lens cutting surface. A part of the cutting peripheral surface of the diamond wheel 1 is a cutting surface for rough rubbing of the lens, and a V-shaped groove 1a is formed in the other part. The groove portion 1a is a portion used when a bevel is formed on the peripheral surface of the lens after rough rubbing. The state of use is shown in FIG. As shown in the figure, the bevel 6a is formed on the entire peripheral edge of the spectacle lens 6 by the groove 1a. In FIG. 2, the alternate long and short dash line R1 is the geometric center of the spectacle lens 6, the arrow L1 is the X-axis direction (horizontal direction), and the arrow L2 is the Y-axis direction (vertical direction).
Are shown respectively.

Now, when the customer selects the spectacle frame and the spectacle lens at the spectacle store, the rim processing of the spectacle lens is performed by the ball milling machine so as to fit the spectacle lens into the rim of the spectacle frame. This spectacle lens is referred to as a spectacle lens 6. The spectacle lens 6 is a minus lens, and has a round shape when viewed from the front in the unprocessed state. The spectacle lens 6 is arranged at a predetermined position shown by the lens supporting shaft 8 and the lens pressing shaft 7 by operating the chucking motor 9. At the same time, the homer 20 is attached to the predetermined position by the homer pressing member 52.
By operating the pulse motors 41 and 49, the spectacle lens 6 is brought into contact with the rough grinding portion of the diamond wheel 1 by applying a required load. Then, the diamond motor 1 is rotated by driving a main motor (not shown), and the spectacle lens 6 is rotated by driving the lens motor 13. By this grinding process, the peripheral edge portion of the spectacle lens 6 is roughly rubbed according to the lens pattern shape of the homer 20. When the rough cutting is completed, the beveling is next started, and the trial sliding and the finishing sliding are performed while giving the information of the apex position of the bevel mountain and the bevel curve.

In the beveling method according to the present invention, in beveling of either one or both of trial sliding and finishing sliding,
In each portion of the lens peripheral portion, the apex position of the bevel on the peripheral surface of the lens was first selected and set in the peripheral width (lens thickness) direction with respect to the ratio of the distance between the front edge and the back edge and the apex of the bevel. Trial laying or the like is performed in a state of being held at a constant value. The value of this ratio is different in each part of the lens peripheral portion. It is necessary to determine the bevel curve in order to set the bevel on the peripheral portion of the spectacle lens, but the method for obtaining the bevel curve will not be described in detail here. However, in order to obtain the bevel curve, it is necessary to select a plurality of locations on the lens peripheral edge under predetermined conditions and determine the lens peripheral edge thickness of at least one of the plurality of locations. In this case, the apex position of the bevel at each portion of the lens peripheral edge portion is determined so as to change under the same condition that is determined corresponding to each portion while the bevel processing is executed. Hereinafter, a method for determining the bevel apex position and trial printing in the bevel processing method of the present invention will be described. As an example, a method for making the bevel in the minimum peripheral thickness portion will be described. The method for forming the apex position of the bevel is the same, except that the value of the ratio is different at other portions of the lens peripheral portion.

In order to carry out beveling, the pulse motor 41 for the X-axis direction is driven to move the head 24, thereby moving the position of the spectacle lens 6 to the position of the groove 1a of the diamond wheel 1. Next, the pulse motor 49 for the Y-axis direction is driven to raise the head 24, and the spectacle lens 6 is separated from the diamond wheel 1. In this state, the lens peripheral edge thickness of a portion corresponding to the above-described beveled surface 107 in the minimum peripheral edge thickness (minimum edge thickness) portion of the spectacle lens 6 is measured.

A lens edge measuring device 53 shown in FIG. 4 is used to measure the lens edge thickness and the like at the edge of the spectacle lens 6. This measuring device is arranged at the front position of the front recess of the head 24 and at the position above the diamond wheel 1. In FIG. 1, the arrangement position of the measuring device 53 is schematically shown by an imaginary line. In FIG. 4, 1
Is a diamond wheel, 6 is a spectacle lens after finishing rough machining, 7 is a lens pressing shaft, 8 is a lens supporting shaft, and 24 is a head. In addition, the lens edge measuring device 53 includes the head 24
Is installed adjacent to the device, and the support plate 61 is provided on the main body 60 of the ball shaving machine.
Is fixed, and on the receiving plate 61, a measurement cover portion 63 for accommodating the measurement arm 62 arranged so as to be freely taken out and put in is provided. An opening portion for inserting and removing the measurement arm 62 is formed in a wall portion of the measurement cover portion 63 on the side of the head 24, and an opening / closing door 64 attached so as to be freely opened and closed is provided in the opening portion.
The measurement arm 62 is set to a predetermined position as shown in the drawing during measurement, and is housed in the retracted position inside the measurement cover 63 when not in measurement. The tip of the measuring arm 62 is formed into a bifurcated shape,
Measuring elements 65 and 66 are provided at the respective tips. The rotation operation for changing the position of the measuring arm 62 is performed by the pulse motor.
67, pulley 68, timing belt 69, and measurement cover
It is performed by a mechanical unit provided in 63.

A method of measuring the peripheral edge thickness by the lens peripheral edge measuring device 53 having the above configuration will be described with reference to FIG. FIG. 6 (A) shows the measurement of the convex surface (front surface) of the lens, and FIG. 6 (B) shows the measurement of the concave surface (back surface) of the lens. Left probe of measuring arm 62
The distance l ₀ between 66 and the right probe 65. In the initial state,
The peripheral portion of the spectacle lens 6 is set at an intermediate position between the left and right measuring elements 66 and 65. Next, as shown in FIG. 6 (A), the spectacle lens 6 is moved leftward to bring the surface thereof into contact with the left tracing stylus 66, and l ₁ is measured. Next, as shown in FIG. 6 (B), the spectacle lens 6 is moved rightward so that the back surface of the spectacle lens 6 is brought into contact with the right probe 65, and l ₂ is measured. L ₁ , l ₂ measured as above
Then, using l ₀ , the peripheral thickness Δl of the predetermined peripheral portion of the spectacle lens 6 to be measured is calculated as Δl = l ₀ − (l ₁ + l ₂ ).

As described above, according to the lens peripheral edge measuring device 53, the peripheral edge thickness of the lens can be measured, and at the same time, the coordinates in the X-axis direction of arbitrary points on the front surface and the rear surface of the lens can be obtained. Therefore, the above-mentioned data and the coordinate data in the Y-axis direction obtained by other measuring means, the value of the diameter, etc. are combined, and the surface curve value, the back surface curve value of the lens, It is possible to obtain the center of curvature of the front surface, the center of curvature of the back surface, and the like.

Next, a beveling method according to the present invention will be described with reference to FIG. The beveling method of the present invention is particularly characterized in how to determine the apex position of the bevel in trial sliding and / or finishing sliding. FIG. 7 shows a cross section around the lower end of the spectacle lens 6 (in this case, an example of a minus lens is shown) after the above-described rough rubbing is completed. However, for convenience of explanation, illustration showing a cross-sectional state is not shown. In FIG. 7, the same elements explained in FIG. 11 are designated by the same reference numerals. Further, in FIG. 7, 6A is the lens front surface and 6B is the lens back surface.

First, the first bevel processing method will be described. The positions of the points A ₁ and B ₁ at both ends of the line segment A ₁ B ₁ corresponding to the beveled surface 80 are determined. The position coordinates of A ₁ and B ₁ are obtained by the lens peripheral edge measuring device 53. The position coordinates are given as two-dimensional coordinates of (x, y), where x is given in the X-axis direction by the distance from the intermediate position between the left and right measuring elements 65, 66, and y is in the Y-axis direction. It is given by the distance from the center of the lens axis holding the lens 6. Therefore, the coordinate value x of A ₁ and B ₁ is actually obtained by the lens peripheral edge measuring device 53, and the coordinate value y is the value of the diameter of each peripheral point in the pattern shape by the homer 20 and the predetermined distance predetermined for the finished surface. And is calculated based on. Thus point A ₁
And the coordinates (x, y) of the point B ₁ are obtained. When the X-axis coordinate values of A ₁ and B ₁ are known, the length of A ₁ B ₁ , that is, the lens thickness can be obtained. The above calculation is executed by a calculation means such as a computer. The same applies to the following calculations.

Next, the points A ₀ and B ₀ are obtained based on the coordinates of the points A ₁ and B ₁ . First, as described above, the coordinates of the point A ₀ can be obtained by a known method using the surface curve rate and the center of curvature obtained by using the lens peripheral side measuring device 53 and the like, and using the coordinates of A _1. it can. Similarly, the coordinates of the point B ₀ can be obtained using the coordinates of the point B ₁ for the back curve rate and its center of curvature. A ₀ and
When each coordinate of B ₀ is obtained, the line segment A ₀ B ₀ , that is, the peripheral thickness of the finished lens peripheral surface 103 can be calculated.

In this way, the peripheral thickness of the finished lens peripheral surface 103 When the (minimum edge thickness) is calculated, the position where the bevel is set is then calculated. In the case of this embodiment, the position where the bevel is set is the thickness of the peripheral edge. It should be decided according to the size of. For example, When the height is 3.6 mm or more, the bevel ridge (vertex C ₁ ) is set at (1/3) t from the front side edge, and when 3.6 to 2.4 mm, the ridge is set 1.2 mm from the front side edge. , If it is less than 2.4 mm, make a ridge at (1/2) t from the edge on the front side. In this way Is calculated, the position of the apex C ₁ of the bevel 105 on the peripheral surface 103 of the finished lens is automatically set according to the size of the peripheral thickness. As a result, the ratio a: b is determined with respect to the ratio of the distance between the apex C _{1 of} the bevel and each of the leading edge and the trailing edge in the width direction of the peripheral edge, as shown in FIG.

After the above ratio a: b is obtained, the coordinates of the points A ₂ and B ₂ with respect to the optional trial lens peripheral surface 102 are obtained, and the line is further drawn in the same manner as when the points A ₀ and B ₀ are obtained. In the minute A ₂ B ₂ , the coordinates of the apex C ₂ of the bevel 81 are obtained using the ratio a: b.

In order to start beveling from the rough-edged lens peripheral surface 101, the pulse motor 41 is driven so that the position of the groove 1a coincides with the position of the apex C _{2 in} the width direction (X-axis direction) of the trial-made lens peripheral surface 102. To adjust. Then, the main motor is driven to rotate the diamond wheel 1 and the lens motor 13 is driven to rotate the spectacle lens 6. As a result, trial machining of the bevel is started. However, the bevel is actually formed according to the straight line 82 after the diamond wheel 1 is cut to the apex C ₂ . Trialing is performed every predetermined distance in the radial direction.

In the bevel trial machining according to the present embodiment, when the spectacle lens 6 makes one revolution in the cutting state at each lens peripheral portion, the X-axis pulse motor 41 is gradually driven as the spectacle lens 6 rotates. 1, the head 24 is gradually moved to the right in FIG. 1, and as a result, the spectacle lens 6 being trial-fabricated is gradually moved to the right in FIG. The movement of the spectacle lens 6 in the trial-polishing process and the finish-polishing process is performed at the two points C ₁ and C at the minimum lens peripheral edge thickness portion, for example.
_It is determined according to the straight line 82 determined by ₂ . That is, in the bevel formed by the groove 1a of the diamond wheel 1, the arrangement position of the spectacle lens 6 during beveling is changed so that the apex of the mountain moves on the line segment C ₁ C ₂ . This is to obtain the inclination of the straight line 82 from the coordinates of the points C ₁ and C ₂ and control the pulse motor 41 for the X-axis based on the data of this inclination while considering the relationship with the cutting dimension of the lens 6 in the radial direction. Then, the position of the spectacle lens 6 is changed.

Therefore, according to the trial beveling of the above-described beveling method, the bevel 81 is formed on the lens peripheral surface 102 at the same ratio a: b as the position on the finished lens peripheral surface 103 during the trial sliding. Therefore, there is an advantage that a bevel image on the peripheral surface 103 of the finished lens can be easily formed. In addition, in order to make a comparison with the trial printing by the conventional method, the bevel 104 by the conventional method is shown by a chain line in FIG. In the bevel processing method of this embodiment, an image of the position of the bevel on the peripheral surface of the finished lens can be created at the trial-touching stage, but at the same time, the bevel position can be changed depending on the situation. In the beveling method according to the present embodiment, the bevels are formed at the same ratio on the peripheral surfaces of the trial and finish rubs, so that the adjustment of changing the bevel position can be easily performed.

If the bevel position has been determined in the trial-polishing process, the finish-polishing is performed, and the bevel-machining is performed while changing the position of the bevel in the same manner as in the trial-stripping process.
The finishing lens peripheral surface is completed.

In the beveling method according to the present invention, as is apparent from the above description, ideally, as shown in FIG. 10, for a distance of, for example, 0.75 cm from the roughened lens peripheral surface 101 to the finished lens peripheral surface 103. On the peripheral surface of each lens, beveling is performed so that the ratio a: b obtained by the calculation is always satisfied. The curve 83 in FIG. 10 is the locus of the apex of the beveled mountain. Therefore, the bevel apex position changes along the curve 83 during processing.
However, considering the processing capability of an actual computer used as a calculation means, it is difficult to continuously change the position along the curve 83 because the calculation amount increases and it takes a long time. Therefore, as described in the above embodiment, the calculation is made faster by approximating the straight line 82 to change the apex position of the bevel. Of course, if the performance of the computer can be improved, the position of the bevel can be changed as shown in FIG.

An eighth aspect of an electrical device configuration for executing the beveling method is described.
Shown in the figure. In FIG. 8, reference numeral 84 denotes a control unit that executes the above-described various calculations and controls by the data obtained by the calculation, and the control unit 84 is composed of a computer. A trial printing switch 85 and a finish printing switch 86 are provided as input units. If the trial sliding switch 85 is operated, trial sliding is executed, and if the finish sliding switch 86 is operated, finish sliding is executed. The control data from the control unit 84 is directly given to the main motor 87, and the lens motor 1
3, the X-axis pulse motor 41, the Y-axis pulse motor 49, etc. are provided via a pulse motor drive circuit 88. As described above, the beveling process requires various data regarding the spectacle lens 6 and its peripheral portion, and these data are provided from the data storage unit 89 to the control unit 84. Control unit 84,
Various data obtained by the lens edge measuring device 53, the target lens (homer's lens pattern) measuring device, and the like are stored in the data storage unit 89 as needed.

Next, a second beveling method according to the present invention using another approximation method will be described. In this approximation method, the straight line 90 shown in FIG. 7 is used. The straight line 90 is obtained as follows. After the various coordinates of the points A ₀ , A ₂ , B ₀ , B ₂ are obtained as described above, a straight line passing through A ₀ and A ₂ and a straight line passing through B ₀ and B ₂ are obtained. Then to pass through the A ₁ to translate the straight line passing through the A ₀ and A _2, the straight line passing through the A ₁ 91
And an intersection A ₀ ′ of a straight line passing through A ₀ and B ₀ , and an intersection A ₂ ′ of a straight line passing through straight lines 91, A ₂ and B ₂ . Similarly, the straight line passing B ₀ and B ₂ is translated to obtain the straight line 92 passing B ₁ , and B ₀ ′ and B ₂ ′ are obtained. And instead of A ₀ , B ₀ , A ₂ , B ₂ , A ₀ ′, B ₀ ′, A ₂ ′,
'Using, C ₁ instead of C _1, C ₂ in the same manner as described above' B _2, C ₂ '
Then, the straight line 90 is determined. Thus, the points A ₀ ′, B ₀ ′,
The reason for calculating A ₂ ′, B ₂ ′, C ₁ ′, C ₂ ′ for the bevel locus 90 is to reduce the measurement error due to the algorithm of computer calculation in the control unit 84.

A third beveling method according to the present invention using still another approximation method will be described. In this approximation method, the straight line 93 shown in FIG. 9 is used. The straight line 93 is obtained by determining the positions of the points A ₂ and B ₂ in the first beveling method described with reference to FIG. 7 as the positions of the front side end and the back side end of the rough edge 101 of the peripheral surface. To do. Therefore, after obtaining A ₁ and B ₁ , a calculation to obtain points A ₀ and B ₀ is performed, and using the points A ₂ and B ₂ which are known in advance as the points A ₀ and B ₀ , the first bevel Similar to the processing method
A straight line 93 is obtained by finding C ₁ and C ₂ . Once the straight line 93 is obtained, the method for processing the bevel thereafter is substantially the same as that in the above-mentioned embodiment. According to this third bevel processing method,
Since the points at both ends of the rough-edged lens peripheral surface 101 are used for A ₂ and B ₂ , there is an advantage that the amount of calculation is reduced and an accurate tilt / inclination number can be obtained from the straight line 93.

The fourth beveling method of the present invention is a method of performing an approximate calculation using the straight line 94 shown in FIG. This beveling method is equal to a method combining the second and third beveling methods. That is, the points A ₀ ′ and A ₂ ′ are obtained using the straight line 95 passing through the point A 1 parallel to the line segment A ₀ A ₂ , and the straight line 96 passing through the point B ₁ parallel to the line segment B ₀ B ₂ is used. Point B ₀ ′, B ₂ ′ is obtained, and C ₁ ′, C ₂ ′ is obtained based on these A ₀ ′, A ₂ ′, B ₀ ′, B ₂ ′,
You get a straight line 94.

In the above-described embodiment, the description has been given of the type of ball milling machine using the homer as the lens pattern, but it goes without saying that the present invention can be applied to the type of ball milling machine not using the lens pattern. Further, the present invention can be similarly applied to the case of a plus lens.

〔The invention's effect〕

As is clear from the above description, according to the present invention, in trial sliding and finishing sliding in the forced beveling method,
Since the bevel position on each lens peripheral surface is formed so as to satisfy a predetermined numerical position condition that represents the bevel position on the finished surface of each peripheral portion, it is possible to easily know the finished image of the bevel in trial machining. Further, there is an effect that the setting of the bevel position can be easily changed in consideration of various conditions in the trial machining.

[Brief description of drawings]

FIG. 1 is a perspective view showing a main structure of a lens edge processing machine, FIG. 2 is a view showing a contact state of a spectacle lens and a cutting member during beveling, and FIG. 3 is a contact between a homer and a follower plate. FIG. 4 is a view showing the relationship and peripheral structure, FIG. 4 is an external perspective view for explaining the lens peripheral edge measuring device, FIG. 5 is a view for explaining the contact relationship between the homer and the follower plate, and FIG. 6 is a lens. FIG. 7 is a diagram for explaining measurement of peripheral thickness, FIG. 7 is a sectional view of a lens periphery for explaining a beveling method according to the present invention, and FIG. 8 is a configuration of an electrical control system for carrying out the beveling method according to the present invention. FIG. 9 is a sectional view of a lens periphery for explaining another beveling method according to the present invention, FIG. 10 is a sectional view of a lens periphery showing a basic idea of the beveling method according to the present invention, and FIG. 11 is a conventional view. In the lens peripheral cross-sectional view for explaining the bevel processing method of is there. [Explanation of symbols] 1 …… Diamond wheel 1a …… Groove 6 …… Glasses 6a …… Bevel 7 …… Lens pressing shaft 8 …… Lens support shaft 13 …… Lens motor 20 …… Homer 24 …… Head 41… … X-axis pulse motor 43 …… Profile plate 49 …… Y-axis pulse motor 53 …… Lens edge measuring device

Claims (4)

[Claims] 1. A holding mechanism for rotatably holding a spectacle lens, a head for accommodating the holding mechanism and attached at least horizontally movably, and a horizontal drive device for moving the head horizontally. A rim of the spectacle lens, which comprises a cutting member for cutting the rim of the spectacle lens, and a rim measuring device for measuring the rim of the spectacle lens, wherein the spectacle lens and the cutting member respectively rotate in a contact state. In a rim processing machine for spectacle lenses that processes the entire part, each of a plurality of predetermined locations that determine a bevel curve in the rim of the spectacle lens, the measurement execution to cause the rim measuring device to measure the rim thickness on the beveled surface Means and a ratio representing a bevel position corresponding to the measured peripheral thickness at any one of at least one of the plurality of predetermined positions. Ratio setting means for setting a bevel position determining means for determining a bevel apex position on the peripheral surface of the finished lens based on the value of the ratio at the arbitrary position, and the head and the glasses by controlling the horizontal drive device. The lens is moved in the horizontal direction, and at least the trial running is performed while changing the bevel apex position so that the lens peripheral surface at the arbitrary position always satisfies the value of the ratio corresponding to the lens peripheral surface. A bevel processing control unit, and a machine for processing a rim of an eyeglass lens. 2. A beveling method for forming a bevel by performing trial sliding and finish sliding on the entire peripheral portion of the spectacle lens after rough edging in order to fit the spectacle lens into the lens frame of the spectacle frame. At least one arbitrary position on the peripheral portion of the spectacle lens measures the peripheral thickness on the beveled surface of the spectacle lens, sets a ratio value representing a bevel position corresponding to the measured peripheral thickness, and sets the ratio to Determine the bevel apex position on the peripheral lens peripheral surface based on the value of, while changing the bevel apex position so that the value of the ratio is always satisfied on the lens peripheral surface of the arbitrary location, the trial touch and the finish A beveling method for a spectacle lens, which is characterized by being rubbed. 3. A beveling method for forming a bevel by performing trial sliding and finish sliding on the entire peripheral portion of the spectacle lens after roughing for fitting the spectacle lens into the lens frame of the spectacle frame, At least one arbitrary position on the peripheral portion of the spectacle lens measures the peripheral thickness on the beveled surface of the spectacle lens, sets a ratio value representing a bevel position corresponding to the measured peripheral thickness, and sets the ratio to The first bevel apex position on the peripheral surface of the finished lens is determined based on the value of, and the second bevel apex position on the peripheral surface of the trial lens is determined based on the value of the ratio. The trial sliding and the finish sliding are performed while changing the bevel apex position along a straight line connecting the first bevel apex position and the second bevel apex position. Beveling method of a spectacle lens according to claim. 4. A beveling method for forming a bevel by performing trial sliding and finish sliding on the entire peripheral portion of the spectacle lens after rough edging in order to fit the spectacle lens into the lens frame of the spectacle frame. At least one arbitrary position on the peripheral portion of the spectacle lens measures the peripheral thickness on the beveled surface of the spectacle lens, sets a ratio value representing a bevel position corresponding to the measured peripheral thickness, and sets the ratio to The first bevel apex position on the peripheral surface of the finished lens is determined based on the value of, and the second bevel apex position on the peripheral surface of the trial lens is determined based on the value of the ratio. The trial sliding and the finish sliding are performed while changing the bevel apex position along a straight line connecting the first bevel apex position and the second bevel apex position. Beveling method of a spectacle lens according to claim.