JPH07108508B2 - Jade machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention is for grinding a raw lens into a shape corresponding to the shape of a lens frame in order to frame the lens in the lens frame of an eyeglass frame. It relates to a ball slicing machine.

(Prior Art) Generally, in a spectacle frame (spectacle frame), a V-shaped bevel groove for mounting a lens is formed over the entire inner peripheral surface. Therefore, it is necessary that a bevel (V-shaped protrusion) is formed on the peripheral surface of the lens attached to the spectacle frame.

By the way, depending on the position where the bevel is formed, when the lens is mounted on the spectacle frame, the amount of protrusion of the side surface of the lens toward the front side of the spectacle frame increases, which may impair the appearance.

Therefore, in the conventional ball-sliding machine, it is necessary to select an appropriate bevel position in the lens thickness direction depending on the shape of the lens frame of the spectacle frame and the shape of the lens to be processed. Therefore, there is a method in which the bevel shape is displayed before lens grinding and the bevel position condition is set while observing the bevel shape.

(Problems to be solved by the invention) However, when grinding lenses for both eyes in this ball shaving machine, one bevel position is set, and after grinding is finished under the condition, before grinding the other lens, It was necessary to set a new bevel position, which made the operation complicated.

In addition, depending on the eyeglass frame and the lens shapes of the left and right eyes (when the visual acuity is extremely different), it may be better to reset the bevel position condition again in accordance with the new lens shape, edge thickness, and the like.

Therefore, according to the present invention, it is possible to perform a process in which it is not necessary to newly set the bevel position after the one bevel position is set and the grinding is finished under the condition and the other lens is ground. It is an object of the present invention to provide a ball slicing machine that can perform processing for newly setting the bevel position condition based on the shape, edge thickness, and the like.

(Means for Solving the Problem) In order to achieve this object, a ball shaving machine of the present invention is a ball shaving machine having a bevel position setting unit for setting a bevel position condition of a lens to be processed before lens grinding. A storage means for storing the first bevel position condition set by one of the lenses of both eyes is provided, and the bevel shape of the other lens is determined based on the first bevel position condition stored by the storage means. On the other hand, the bevel position condition of the other lens is newly obtained from the lens shape data of the other lens, and the bevel shape of the other lens can be determined. The present invention is characterized in that a selection means for selecting the setting of the condition is provided.

(Examples) Examples of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a bevel shape display system of a ball slide machine according to the present invention.

In FIG. 1, 1 is a frame shape measuring device, 2 is a memory, and 3 is a measuring device for measuring the refractive surface position of a lens.

The frame shape measuring device 1 is a lens frame LF of an eyeglass frame.
Shape, or more accurately, the locus of the bevel groove as shown in Fig. 6 It is for measuring as [i = 1,2,3, ... N]. The detailed configuration and operation of the frame shape measuring apparatus 1 are the same as those disclosed in the above-mentioned Japanese Patent Application Nos. 60-115079 and 60-287491. Radial information measured by this frame shape measuring device 1 Are stored in the memory 2.

The measuring device 3 includes a pulse motor 32 and the pulse motor 32.
Of the support member 31 that moves toward and away from the lens L by driving the lens L, the fillers 33 and 34 disposed on the support member 31 and brought into contact with the front and rear refraction surfaces of the lens L, and the movement of the fillers 33 and 34. It has encoders 35, 36 mounted on a support 31 which makes it possible to detect the quantity.

On the other hand, the lens L is a lens rotation axis of a carriage (not shown).
The lens rotation shafts 4 and 4 are sandwiched between 4 and 4, and are rotatably driven by a pulse motor 37. Therefore, the lens L
Are driven to rotate integrally with the lens rotation shafts 4, 4 by a pulse motor 37. This pulse motor
37 is the radial angle from memory 2 Is entered. Then, the pulse motor 37 controls the rotation of the lens rotation shafts 4 and 4 based on this input to obtain the radial angle. Only the lens rotation shafts 4, 4 and the lens L are rotated.

On the other hand, the pulse motor 32 of the measuring device 3 has a radial length from the memory 2. Is entered. Then, the pulse motor 32 drives the support base 31 based on this input to move the fillers 33 and 34 to the radial length. It is designed to be positioned at.

The detection amounts fZ _i and bZ _i of the encoders 35 and 36 are input to the arithmetic unit 5 and subjected to arithmetic processing described later.

An input device 6 and a display device 7 are connected to the arithmetic device 5. The input device 6 and the display device 7 are integrally attached to the operation panel 8 as shown in FIG.
Is a graphic display device made of crystals, for example.

The lens shape data obtained by the arithmetic unit 5 is input to and stored in the memory m1 or the memory m2.

Next, the operation of the above apparatus will be described with reference to the flow charts of FIG. 2 (a), (b), (c) and (d).

2 (A) and 2 (B) show the right-eye lens data processing, and FIGS. 2 (C) and 2 (D) show the left-eye lens data processing.

[I] Right eye lens bevel data processing Step 10 (frame shape measurement) The shape of the right lens frame LF (see FIG. 7) of the spectacle frame is measured by the frame shape measuring device 1 and then input by an input means (not shown). Frame Geometry Center Distance "FPD"
Radial information of the bevel locus centered on the position supported by the wearer's interpupillary distance "PD" and the vertical displacement "UP" between the geometric center of the frame and the pupil center Are stored in the memory 2. The left and right lens frames of this spectacle frame have the same shape and size, so the right lens frame
Radial information of LF's bevel locus Is used for left lens shape data processing.

Step 11 (Right-eye unprocessed lens measurement, edge thickness calculation) As shown in FIG. 1, with the fillers 33 and 34 in contact with the front refractive surface and the rear refractive surface of the unprocessed lens L, respectively, When the start button ST is pressed after pressing the right eye selection button R of the input device 6 in FIG. 4, the front refractive surface of the right eye lens is pressed.
Radial length of L _f and rear refracting surface L _b The position measurement corresponding to is started.

This allows the radial length from the memory 2 to be By inputting a pulse corresponding to the pulse motor 32 to the pulse motor 32 and driving the pulse motor 32 by a predetermined number of pulses, the support base 31 is driven and the fillers 33 and 34 are moved to the radial length. Move to the position of.

On the other hand, the pulse motor 37 has a radial angle from the memory 2. By inputting a pulse corresponding to, and driving the pulse motor 37 by a predetermined number of pulses, the lens rotation shafts 4, 4 and the lens are driven. Rotate.

The encoders 35 and 36 detect the amount of movement of the fillers 33 and 34 in the Z direction at this time, and the detected value fZ by the encoders 35 and 36 is detected.
_i , bZ _i are input to the arithmetic unit 5.

The arithmetic unit 5 obtains the edge thickness Δ _i = fZ _i −bZ _i .

Step 12 (selection of maximum edge thickness and minimum edge thickness) The arithmetic unit 5 determines the maximum edge thickness Δ _max among the edge thicknesses Δ _i.
Radial with (= fZ _a −bZ _a ). And radius with minimum edge thickness Δ _min (fZ _b −bZ _b ). Choose.

Here, fZ _a is the radial Position of the front refracting surface L _{f in} the Z direction, bZ _a is the radial Position of the rear refracting surface L _{b in} the Z direction, fZ _b is the radius vector Position of the front refracting surface L _{f in} the Z direction, bZ _a is the radial In the Z direction of the rear refracting surface L _b .

Step 13 (calculation of bevel apex position and curve value) Bevel groove of the bevel grindstone (V-shaped groove) on the peripheral edge of this lens.
When forming the bevel V-shaped projection), the size and shape of the bevel groove are known in advance.

When forming a bevel on the lens peripheral edge having the edge thickness Δi with such a bevel grindstone, the ratio of the distance from the front edge of the bevel to the top of the bevel and the distance from the top edge of the bevel to the edge of the rear edge is m: n Set to.

Here, the bevel top position at the maximum edge thickness Δ _max is eZ _a
And the bevel apex position at the minimum edge thickness Δ _min is eZ _b , the bevel apex positions eZ _a , eZ _b are Ask from. next, Is solved to find the radius of curvature eZ ₀ , eR of the beveled surface y _c .

Here, since the left side of equations (3) and (4) is the same,
From (3) = (4), And solving this for eZ ₀ , eZ ₀ becomes Required from.

The curve value Ce of the beveled surface y _c is (Where n is the refractive index of the lens L). The calculation of these equations (1) to (6) is executed by the arithmetic unit 5.

Step 14 The arithmetic unit 5 Since the angle γ and the depth V of the V groove of the bevel cutting grindstone of the ball grinding machine for obtaining the radius of curvature fR of the front refracting surface Lf of the lens L are known, the radius of curvature fR of the front refracting surface Lf and the bevel curved surface position kZ _a of edge end ka radius of curvature eR and depth V from the front refractive surface Lf, obtains the position kZ _b of edge end kb. Then, the maximum edge bevel apex distance s and the minimum edge bevel apex distance t are s = eZ _a −kZ _a …………………… (9) t = eZ _b −kZ _b ……………… ……… Ask (10).

Also, any radial Let k be the edge of the front refracting surface Lf at, and kZ _i be the position at the edge k _i. If the bevel vertex position at is eZ _i , and the bevel vertex distance from this edge k _i to the bevel vertex position eZ _i is U, then the bevel vertex position eZ _i is Than Solve It is obtained from equation (12).

After the curve value Ce of the beveled curved surface y _c is obtained as described above, an arbitrary radius vector is _calculated based on this Ce. The bevel apex position at the position may be calculated.

Step 15 (Display) The display device 7 digitally displays the bevel curve value Ce and the bevel apex distance s, t obtained in the above step, and the bevel cross-sectional shapes 71, 72, 76 are schematically shown in FIG. Display as shown.

Changing the bevel distance s, t Step 16 In this step, the display displayed on the display device 7 is changed to the eighth
Display mode switching button 67 (see FIG. 4) for switching as shown in FIGS. For moving the pointer line H indicating The button 82, the “t” button 62 for changing the bevel apex distance, the “s” button 61, the “I” button 64, the “D” 65, etc. are pressed to change the screen display or data.

Here, the operator measures the maximum frame thickness W ₁ (see FIG. 7) of the lens frame of the spectacle frame with the bevel apex distance s digitally displayed on the display device 7, and half the value thereof is measured in front of the lens frame. The maximum distance from the frame to the bottom of the V groove of the bevel groove of the lens frame (the maximum bevel distance of the frame) is actually measured, but the maximum bevel distance D ₁ of the frame is actually measured in advance. Similarly, the minimum frame thickness W ₂ is measured, and half the value is taken as the minimum bevel distance of the frame.
Measure D ₂ .

The maximum bevel distance D ₁ of this frame is compared with the maximum bevel distance s of the lens. If they are different, after turning on the “S” button 61 of the input device 6 shown in FIG.
If you want to increase, press the “I” button 64 and display value s
If you want to decrease, press the "D" button 65.

Similarly, the minimum bevel distance D ₂ of the frame is compared with the minimum bevel distance t of the lens, and when changing, press the “t” button 62.
After turning on, perform the same operation.

Such an increase / decrease amount (shift amount) of the display values s, t is displayed as a numerical value such as "± 0 ..." After the "position" displayed on the display unit of the display device 7.

That is, the shift amount represented by this numerical value is the bevel apex position obtained by calculation using the edge division ratio of m: n,
That is, when the bevel position when the bevel apex is located at the bevel distance s, t from the front refracting surface is "0", the actual machining bevel apex is located at a position moved from this position. Indicates

Also, any radial To change the bevel cross-sectional shape at the changed position by changing the position of, press the display mode switching button 67 to display the display shown in FIG. After pressing the button 82, the “I” button 61 or the “D” button 64 is pressed.

this If you press the "I" button 61 after pressing the button 82, The pointer line H indicating is rotated clockwise to change the position. on the other hand, If you press the “D” button 64 after pressing the button 82, The pointer line H indicating is rotated counterclockwise to change the position.
Along with this, it is displayed on the display device 7. The display of the bevel cross-sectional shape 76 is also radial It is changed to the shape located at.

Step 16-1 In this step, the display values s, t,
The position of the pointer line H, the bevel shape 76, etc. are displayed and the step
Move to 16-2.

That is, in step 16, the display mode switching button 67
When is pressed, in this step 16-1, the lens peripheral shape, the lens curved shape, the curve value (curve 5.0 in the figure) and the shift amount from the bevel apex position set by m: n as shown in Fig. 8 (Fig. Will display position +0.3).

Further, when the display mode switching button 67 is pressed in step 16, the lens peripheral shape, the lens bevel cross-sectional shape, the curve value (curve 5.0 in the figure) and the bevel apex position set by m: n are displayed as shown in FIG. Shift amount (position +
0.3) The position of the maximum edge thickness and the position of the minimum edge thickness are displayed.

The bevel apex position obtained in step 14, that is, the “bevel apex position set by m: n and obtained by calculation” is not changed immediately after the step 14 is shifted to the step 15. Therefore, immediately after shifting from step 14 to step 15, the shift amount of the bevel apex position is "0", and "position +0.3" in FIGS. 8 and 9 is displayed as "position 0".

Step 16-2 In this Step 16-2, it is judged whether or not the "SET" button 66 has been pressed.
Return to "Display value s, t, pointer line H, bevel shape 76 change operation"
To be able to continue.

If the “SET” button 66 has been pressed and the result is YES, the process moves to step 17.

Step 17 The arithmetic unit 5 uses the changed bevel vertex positions eZ _a ′, eZ _b ′.
From equation (2) To calculate the radius of curvature eR ′ of the new beveled surface,
Similar to equation (3) A newer bevel curve value Ce 'is calculated, and the process proceeds to step 18.

Step 18 In this step, the curve value calculated in step 17 is displayed on the display device 7, and the process proceeds to step 19.

Step 19 In this Step 19, it is judged whether or not the memory button 70 has been pressed to turn it on, and if it has not turned on, the process returns to step 16 and "display value s, t, pointer line H, change operation of bevel gauge 76" To be able to continue.

If it is ON, the process proceeds to step 20.

Step 20 In this step, the information such as the lens data and the lens shape data obtained in Steps 10 to 19 is stored in the memory m1, and the right-eye lens bevel information display process ends.

[Changing Bevel Distance s, t by Curve Value] Instead of directly changing the bevel distance s, t as described above, the curve value Ce may be changed. This step is 21 ~
23.

Step 21 Turn on the "C" button 63 of the input device 6 and operate the "I" button 64 or the "D" button 65 to change the curve value Ce.

Step 21-1 In this step, the changed value input in Step 21 is displayed on the display device 7, and the process proceeds to Step 21-2.

Step 21-2 In this step, it is determined whether or not the "SET" button 66 has been pressed. Then, if the "SET" button 66 has not been pressed, NO is returned to the step 21 to loop and the input change of the numerical value is continued. If the "SET" button 66 is pressed, the process proceeds to step 22.

Step 22 The computing device 5 calculates the bevel curvature radius eR ′ from the changed curve value Ce ′. And the new bevel apex positions eZ _a ′, eZ _b ′ in the relationship of (2) Then, a new bevel distance s ′, t ′ is obtained by the following equation: s ′ = eZ _a ′, kZ _a ′ …………………… (9) ′ t ′ = eZ _b ′ , kZ _b ′ ………………………… (10) ′.

Step 23 This new s ', t' is displayed on the display device 7, and Step 24
Move to.

Bevel distance s of such a manner modified lens ', t' Do satisfies bevel distance D _1, D ₂ of the frame, changes the curve value Ce to a value in close approximation.

Instead of digitally displaying the bevel distances s', t'of the lens, the scales 73, 74, 77 and the indexes 75, 76, 78 may be image-displayed as shown in FIG. Further, here, only the edge thicknesses Δ _max and Δ _min are displayed, but the edge thickness Δ on an arbitrary meridian can also be displayed.

Step 24 In this step, it is judged whether or not the memory button 70 has been pressed, and if not pressed, the process returns to step 21 with NO and loops to continue the data change input.

If so, the process proceeds to step 25.

Step 25 In this step, the bevel distances s ', t' of the lens changed as described above are stored in the memory m1.

[II] Left-eye lens bevel data processing Step 100 In this step, since the left and right lens frames of the spectacle frame have the same shape, the memory m1 obtained in Step 1 of [I] is calculated.
Radial information of the bevel locus that was stored in To use. Therefore, in this left eye lens data processing,
Radial information of the bevel locus Omitting the work of measuring Is converted for the left eye, and the process proceeds to step 110.

Step 110 (Left eye unprocessed lens measurement, edge thickness calculation) As shown in FIG. 1, with the fillers 33 and 34 in contact with the front and rear refracting surfaces of the unprocessed lens, respectively,
After pressing the left eye selection button L, press the start button ST. As a result, the radial lengths of the front refractive surface L _f and the rear refractive surface L _b of the left-eye lens are The position measurement corresponding to is started. Then, similarly to the edge thickness calculation (step 11) of the right eye lens, the bevel radius information is obtained. And the maximum edge thickness Δ
Radial with _max (= fZ _a −bZ _a ). And radius with maximum edge thickness Δ _min (= fZ _b −bZ _b ). Is selected, and the process proceeds to step 120.

Step 120 In this step as well, in the same way as "calculation of bevel apex position and curve value" of the right eye lens in step 13, the bevel apex position and curve value of the left eye lens are calculated, and the process proceeds to step 120-1. To do.

Step 120-1 In this step, it is judged whether or not the "P" button 81 (selection means) for utilizing the right lens data that has been measured and calculated previously has been pressed.

If the "P" button 81 is pressed, step 12
The process shifts to 0-3, and if the "P" button is not pressed, shifts to step 120-2.

Step 120-2 In this step, it is determined whether or not the start button ST has been pressed in order to perform the bevel curve calculation processing.
If the start button ST is pressed, steps 130 and 140
The same processing as in steps 13 and 14 is performed to obtain the bevel curve Ce and the bevel apex distance s, t of the left lens, and the process proceeds to step 150.

Step 120-3 In this step, the right lens data obtained and stored in [I] is recalled from the memory m1, and this right lens data is converted into left lens data, and step 150
Move to.

At this time, the bevel apex position of the left-eye lens is the `` bevel apex distance s, t '' and the `` position ± 0.
Is calculated based on the shift amount and the like indicated by "...".

Here, the bevel apex distances s, t are distances from the lens front refractive surface L _f when the maximum edge thickness and the minimum edge thickness of the lens are divided by m: n. Also, the shift amount is the bevel apex position calculated by using the edge division ratio of m: n,
That is, when the bevel position when the bevel apex is located at the bevel distance s, t from the front refracting surface is "0", the actual machining bevel apex is located at a position moved from this position. Indicates

Therefore, the shift amount of the bevel apex position before and after the lens is Δ
If a (minus amount on the front side, plus amount on the rear side), the bevel apex distance from the front refractive surface at the maximum edge thickness of the left eye lens is sL, and the bevel apex distance from the front refractive surface at the minimum edge thickness is tL. Then, the actual bevel apex distance sL used in the processing of the left eye lens, tL is determined by calculation as _{sL = Ps + Δa = eZ a} + kZ a + Δa ... (13) tL = t + Δa = eZ b + kZ b + Δa ... (14) To be

The bevel apex positions eZ _a and eZ _b of the left-eye lens at the bevel apex distances sL and tL are obtained as eZ _a = sL + kZ _a −Δa ……… (15) eZ _b ＝ tL ＋ kZ _b −Δa ……… (16) To be

Step 150 In this step 150, lens data including the bevel curve obtained in the above step 140, or step 120-
The lens data obtained from the previous data in 3 is displayed on the display device 7.

As this data, as in step 15, the left lens bevel curve value Ce, the bevel apex distance s, t,
There are bevel cross-sectional shapes 71, 72, 76, etc.

Step 160 In this step, the display displayed on the display device 7 is
Display mode switching button 67 for switching as shown in Figs. For moving the pointer line H indicating The button 82, the “t” button 62 for changing the bevel apex distance, the “s” button 61, the “I” button 64, the “D” 65, etc. are pressed to change the screen display or data. This operation is the same as the operation in the previous step 16.

Step 160-1 In this step, the display values s, t of the left-eye lens, the position of the pointer line H, the bevel shape 76, etc. changed in step 160 are displayed on the display device 7 at the same time as the previous right-eye data. Go to step 16-2.

That is, in step 160, the display mode switching button 6
When 7 is pressed, the right-eye lens data obtained last time (part of the graphic data is a broken line) is displayed on the left half of the display screen of the display device 7, as shown in FIG. On the other hand, data such as the lens peripheral shape of the left eye lens, the lens curved shape, the curve value (curve 5.0 in the figure), and the shift amount (position +0.3 in the figure) from the bevel apex position set by m: n are displayed. It is displayed on the right half of the display unit of the device 7.

Further, when the display mode switching button 67 is further pressed in step 160, as shown in FIG. 11, data such as the peripheral edge shape of the right eye lens, the lens bevel cross-sectional shape, and the curve value obtained last time (graphic data is The broken line) is displayed on the left half of the display screen of the display device 7. On the other hand, data such as the lens peripheral shape of the left eye lens, the lens bevel cross-sectional shape, the curve value (curve 5.0 in the figure) and the shift amount from the bevel apex position set by m: n (position +0.3 in the figure) are displayed on the display device. It is displayed on the right half of the display section of 7.

The "position" display of the shift amount of the bevel position of the left eye lens is the same as the previous time, and only the data of the left eye lens is changed by the button operation in step 160.

Steps 160-2 to 250 In the processing of steps 160-2 to 250, the changed data is stored in the memory m2 at step 200 or 250. The other processing is the same as the processing in steps 16-2 to 25, and therefore its explanation is omitted.

After these steps are completed, the left eye lens is beveled based on the lens data stored in the memory m2.

In the embodiment described above, the example in which the lens data for the left and right eyes is displayed on the display unit of the display device 7 at the same time is shown. However, the invention is not necessarily limited to this, and the lens data for the left and right eyes are separately provided. It may be displayed.

(Effects of the Invention) According to the present invention, "one lens data obtained by the previous measurement calculation is used to obtain the other lens data by calculation" or "the new lens shape, the edge thickness, etc. are used to determine the bevel position condition. If the eyeglass frame and the left and right eyes have substantially the same lens shape, and the eyesight is not significantly different and the edge thickness of the lens is also substantially the same, After setting one bevel position and finishing grinding under that condition, before grinding the other lens,
It is possible to perform processing without having to newly set the bevel position. Moreover, depending on the eyeglass frame and the lens shapes of the left and right eyes (when the visual acuity is extremely different), a new lens shape,
The bevel position conditions can be set again according to the edge thickness and the like.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a ball slicing machine according to the present invention. 2 (a), (b), (c) and (d) are flowcharts showing the operation of the ball shaving machine according to the present invention. FIG. 3 is a schematic diagram for explaining the principle of the present invention. FIG. 4 is a plan view showing an example of the input device and the display device. FIG. 5 is an explanatory diagram showing another example of the display example of the display device. FIG. 6 is an explanatory diagram showing the relationship between the lens frame and its radius vector information. FIG. 7 is a schematic diagram showing the relationship between the bevel distance of the lens framed in the lens frame and the bevel vertex distance of the frame. 8 to 11 are explanatory views showing examples of data and graphics displayed on the display device of FIG. 1 ... Frame shape measuring device 3 ... Lens refracting surface position measuring device 5 ... Computing device 6 ... Input device 7 ... Display device

Claims (1)

[Claims] 1. A ball mill having a bevel position setting section for presetting a bevel position condition of a lens to be processed before lens grinding, wherein a first bevel position set by one of the lenses of both eyes. A storage means for storing the condition is provided, and the bevel shape of the other lens is determined based on the first bevel position condition stored by the storage means, while the bevel position condition of the other lens is set to the other. The lens is configured so that the bevel shape of the other lens can be newly obtained from the lens shape data of the other lens, and a selection means is provided for selecting the setting of these two bevel position conditions. Sliding machine.