JPH09174405A - Lens frame shape measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently measure a lens frame with high accuracy by providing feelers holding the lens frame of a spectacle frame and measuring the shape of a lens edge groove, relatively movably forming a holding/measuring means, and arranging the feelers on the plane passing through at least one point of the lens edge groove. SOLUTION: A probe is constituted of a sliding seat 541 slidably inserted into a frame 53 and a detecting feeler section 542 fitted to the sliding seat 541 rotatably centering on a shaft O1 and slidably in the axial direction of the shaft O1 . The feeler section 542 is constituted of a templet detecting contact 544 notch-molded on a rotary sliding shaft 543 and having a semicircular cross section and a lens frame detecting contact wheel 546 rotatably fitted at the end section of a substantially U-shaped arm member 545 fitted to the rotary sliding shaft 543. Feelers are arranged on the plane passing through at least one point of the lens edge groove of a lens frame, and the feelers can be automatically arranged in the lens edge groove of the lens frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens frame shape measuring device for measuring the shape of a lens frame of an eyeglass frame.

[0002]

2. Description of the Related Art In order to frame a lens in the lens frame of a spectacle frame, a template type lens grinding apparatus for grinding a textured spectacle lens based on a template processed according to the shape of the lens frame has been conventionally used. Has been put to practical use. On the other hand, the present inventor directly measures the lens frame of the spectacle frame digitally in order to eliminate the troublesomeness of manufacturing the template in the lens grinding device, and grinds the base spectacle lens based on the measured value. We have proposed a direct lens grinding machine.

[0003]

SUMMARY OF THE INVENTION In the present invention, in the lens frame shape measuring device arranged in the above-mentioned direct-mounting type lens grinding device, the fine beveled groove of the lens frame and the feeler are aligned with each other. Difficult and cumbersome, this work reduces measurement efficiency even if other measurement procedures are automated,
As a result, there is a possibility that the measurement accuracy is reduced.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems related to the conventional lens frame shape measuring apparatus, and the feeler can be automatically arranged in the bevel groove of the lens frame. It is an object of the present invention to provide a lens frame shape measuring device capable of efficiently and highly accurately measuring.

[0005]

In order to achieve the above-mentioned object, the present invention comprises:
It has the following structural features. That is, the lens frame shape measuring device of the present invention has a holding unit that holds the lens frame of the spectacle frame, and a measuring unit that includes a feeler that measures the shape of the bevel groove of the lens frame, and the holding unit. The measuring means is configured to be movable relative to each other, and the feeler is arranged on a plane passing through at least one point of the bevel groove of the lens frame.

[0006]

【Example】

(Description of Embodiments) Outline of Apparatus FIG. 1 is a perspective view showing a grinding unit of a grinding apparatus according to the present invention, that is, a grinding machine. A circular grindstone 3 composed of a rough grindstone 3a, a beveled grindstone 3b, and a flat precision machining grindstone 3c is housed in a grindstone chamber 2 of a housing 1. The grindstone 3 is attached to a rotary shaft 5 having a pulley 4. . The pulley 4 is connected to the rotary shaft of the grindstone motor 6 via a belt 7, and the grindstone 3 is rotated by the rotation of the grindstone motor 6.

The bearings 10 and 11 formed on the housing 1 include
The carriage shaft 12 is rotatably and slidably supported in the axial direction, and one end of the carriage shaft 12 is rotatably fitted and inserted into a bearing 21a formed on a feed base 20 described later. Arms 14 and 15 of a carriage 13 are fixed to the carriage shaft. Further, a lens rotation shaft 18 for chucking and rotating the lens LE to be processed is attached to the arms 16 and 17. One axis 18a of the lens rotation axis 18
A chucking handle 19 is attached to, and by rotating it, the shaft 18a slides in the axial direction to chuck the lens to be processed. Further, an arm portion 31 of a lens measuring device 30 described later is attached to the carriage shaft 12 so as to be able to swing coaxially with the swing shaft of the carriage 13.

Wheels 22 are attached to a base plate 21 of the feed table 20, and the wheels 22 are rotatably mounted on rails 23 attached to the housing 1, whereby the feed table is set on the rails 23. Therefore, it is held so that it can be moved. Slide 2
The female screw portion 24 of 0 meshes with the feed screw 41 that rotates coaxially with the rotation shaft of the motor 40, and the feed base 20 is moved left and right as indicated by an arrow 25 by the rotation of the motor 40. Since the bearing 21a is formed on the feed table 20 as described above, and the carriage shaft 12 is attached to the bearing 21a, the carriage 13 is also laterally moved by the lateral movement of the feed table 20.

Further, the substrate 21 of the feed base 20 is
Book shafts 26, 26 'are implanted, and a stop member 27 is attached to the shafts so as to be vertically movable. A female screw portion 28 is formed on the stopper member 27, and a feed screw 43 fixed coaxially with the rotation axis of the stopper feed motor 42 is meshed with the female screw portion 28.
The stopper member 27 is configured to move up and down by the rotation of the motor 42. A rotating wheel 16b attached to the tip of an arm 16a protruding from the carriage 13 is in contact with the upper surface of the stopper member 27 so that the carriage 13 is swung by the vertical movement of the stopper member 27. .

Lens Frame Measuring Means FIG. 2 is a perspective view showing an example of the measuring means for digitally measuring the shape of the lens frame of the spectacles according to the present invention or the shape of the target lens preliminarily modeled accordingly. The protrusion shaft 18b of the lens rotation shaft 18 protruding outside the arm 16 of the carriage 13 is a bearing 50 formed on the carriage 13.
It is inserted through. One long side frame 52 of a detection arm 51 formed of a rectangular rod-shaped frame is attached to the end portion 18c of the shaft 18b in a direction orthogonal to the rotation axis of the shaft 18b. A detector 54 is slidably attached to the other long side frame 53, and is constantly pressed toward the frame end side by a spring 59 inserted in the detector frame 53. Pulleys 57 and 58 are rotatably attached to the short side frames 55 and 56 of the detection arm 51. On the other hand, a pulley 60 is rotatably inserted in the shaft 18b, and a code plate 62 of an encoder 61 is coaxially fixed to the pulley 60.

The detection head 62a of the encoder is fixed to the outer surface of the arm 16 of the carriage 13. One end of the first wire 80 is fixed to the detector 54, and the pulley 5
After being wound around the pulley 60 via 7, the other end is fixed to the side surface of the pulley 60. The second wire 81 has one end fixed to the detector 54 and is wound around the pulley 60 via the pulley 58 in the opposite direction to the first wire, and the other end is fixed to the side surface of the pulley 60. Thereby, the detector 54
The amount of sliding movement on the frame 53 is read as the amount of rotation of the pulley 60, that is, the rotation of the code plate of the encoder 61.

As shown in FIG. 5, the detector 54 has a sliding seat 541 slidably fitted in the frame 53, and is rotatable about the shaft O ₁ on the sliding seat 541. Detection feeler portion 542 mounted slidably in the axial direction of O _1.
It is composed of The feeler portion 542 is rotated at the end of a template plate contactor 544 having a semicircular cross section formed by notching on the rotary sliding shaft 543 and an end portion of a substantially U-shaped arm member 545 attached to the rotary sliding shaft 543. It is composed of a contact wheel 546 for lens frame detection which is mounted so as to be possible. The contact surface 544a of the contact 544 and the contact peripheral surface 546a of the contact wheel 546 are both configured to be located on the axis O ₁ . In the vicinity of the other end of the rotary sliding shaft, a pin 547 is fixedly passed through in parallel with the contact surface 544a, and this pin is attached to a locking member 548 attached to the long side frame 52 when the detector is in the initial position. The sides are abutted.

The carriage 13 contains a lens shaft rotating motor 70 and a sprocket wheel shaft 71 having sprocket wheels 72 and 73 rotated by the rotation of the motor 70 at both ends. Also, the lens rotation shafts 18 and 18a
Are respectively provided with sprocket wheels 74 and 75. The sprocket wheels 72 and 74 are respectively provided with a tune 76, and the sprocket wheels 73 and 75 are provided with a tune 77, respectively. Is configured to communicate as.

On the other hand, the eyeglass frame holding means 90
When the pedestal 91 is located at the initial fixed position of the carriage 13, the pedestal 91 is installed in parallel with the longitudinal direction of the arm 16. Two rails 92, 93 are attached to the pedestal 91 in parallel with the longitudinal direction of the arm 16 of the carriage 13,
On the rails 92 and 93, an eyeglass frame holder support member 94,
95 is slidably disposed. Support members 94 and 95
Is constantly pulled by a spring 96. A feed screw 97a provided on the rotation shaft of the motor 97 is meshed with the foot portion 95a of the support member 95. The arms 94 of the support members 94 and 95
The upper portions of b and 95b have holding tools 94c and 95c for holding the eyeglass frame holding tool 100.

As shown in FIG. 3, the eyeglass frame holder 100 includes a base plate 101 having a circular opening 102 in the center,
The base plate 101 includes eyeglass frame holding arms 103 and 104 slidably attached to each other so as to face each other, and an equalizer 105 for pressing the eyeglass frame from above. The spectacle frame 200 is sandwiched between the holding arms 103, 104 so that the lens frame 201 to be measured is located on the circular opening 102.
The upper and lower rims of the lens frame are sandwiched by and the lens frame is pressed and fixed by the equalizer 105. At this time, the edge 105a at the front end of the equalizer 105 and the edge 105b at the rear end of the equalizer 105 are formed in the cutouts 1 of the holding arms 103 and 104, respectively.
03a and 104a, the front edge 101a and the rear edge 101b (not shown) of the base plate 101 are located on the same plane as the edges 105a and 105b, respectively.

The holder 100 holding the spectacle frame 200 in this manner is held by the holders 94c and 95c. here,
With respect to the bevel groove center 201b of the lower rim of the lens frame, the rear plate 105b of the equalizer 105 and the rear edge 101b of the base plate are separated by the same distance d so that the base plate 101, the equalizer 105, and the notch 103a, 1
04a is configured. On the other hand, the clamps 94c, 95c
Since the inclined grooves 94d and 95d are formed, when the holding tool 100 is held by the holding tools 94c and 95c as shown in FIG. 4, the edge 105b of the rear end portion of the equalizer 105 and the rear side of the base plate. The edge 101b is in contact with the slope and is automatically sandwiched so that the center of the contact point interval thereof coincides with the groove center of the slope groove. As a result, the bevel groove center 201b of the lower rim of the lens frame coincides with the slope groove center of the clamps 94c, 95c.

When the template is supported by the eyeglass frame holder supporting members 94 and 95, a template holder 110 is used as shown in FIG. The template holder 110 is the support frame 1
11 and cylindrical members 112, 11 attached to both ends thereof
3, the template mounting column 114 that is planted in the center of the support frame 111, and the pin 1 that is planted on the end face of the column.
14, 115, and 116. Template 21
0 is the pin 11 by a hole formed in advance.
It is mounted on the mounting column by fitting it to the mounting members 4, 115 and 116, and is supported by sandwiching this template holder between the supporting members 94 and 95.

Operation of Measuring Means Next, the measurement of the spectacle lens frame by the measuring means having the above construction will be described below. After holding the spectacle frame holder 100 between the support members 94 and 95 and moving the carriage 13 by a predetermined amount in the direction of arrow A (see FIG. 1) by the motor 40, the lower groove 201 of the lens frame 200 at the initial setting position is moved. The motor 97 is rotated so that the contact wheel 546 and the contact wheel 546 come into contact with each other on the same plane.
2, 93 are moved by a predetermined fixed amount so that the rotation center O ₂ of the detection arm 51 is located within the lens frame. At this time, the lower groove 201 of the lens frame 200 hooks the contact wheel 546, and at the same time, the pin 547 is released from the locking member 548 so that the rotary sliding shaft 543 can freely rotate. The movement amount of the detector 54 on the frame 53 is converted into the rotation amount of the encoder by the wires 80 and 81.

Now, as shown in FIG. 2, at the initial fixed positions of the carriage 13 and the detection arm 51, as shown in FIG. 7, the detector 54 does not come into contact with the spectacle frame and is repulsed by the spring 59 to the initial position. An origin 0 is set on a line of the axis O _{1 at} a certain time, and a distance from the origin 0 to the rotation center O ₂ of the detection arm 51 is set to L, and the detector according to the movement of the spectacle frame by the predetermined amount and the rotation of the detection arm. And the encoder's resolution is e ⁰ / pu
lse, the resolution obtained by converting the displacement of the detector at this time is d
(Mm) / pulse, and the detection arm 51
Is parallel to the arm 16 of the carriage 13 and the reference angle is 0 °, the rotation angle θn of the detection arm 51 is
In this embodiment, the moving radius ρn of the lens frame at
When the encoder 61 detects the movement amount of the detector 54 on the detection arm 51, the rotation amount of the detection arm is also detected, so that ρn = L− (Cn−θn / e) d.・ Given as (1). Incidentally, the radius vector ρ0 in .theta.n = 0 or reference position from (1) is given as _{ρ 0 = L-Cod ········· (} 2).

In this way, if the detection arm 51 is rotated about the entire circumference of the lens frame, the shape information (ρn, θn) of the lens frame 200 at the rotation center O ₂ (where n =
0, 1, 2, 3, ... N) are obtained as digital values. This (ρn, θn) is data when the rotation center of the detection arm 51 is located at an arbitrary position O ₂ of the lens frame, and is not data when the rotation center is located at the geometric center of the lens frame 200. 8 and 9 show a method of correcting this.
This will be described based on the schematic diagram shown in FIG.

Detection when the carriage 13 is at the initial position
Rotation center O of output arm_TwoAnd the carriage swing center O
X- where the connecting straight line is the Y axis and the axis orthogonal to this is the X axis
Taking the Y orthogonal coordinate system, the lens frame measurement data (ρn,
θn) is coordinate-transformed based on the polar coordinate-orthogonal coordinate transformation formula of Xn = ρn × cos θn (3) Yn = ρn × sin θn (3)
Coordinate values. Lens frame data (x
n, yn), minimum value coordinates in a direction parallel to the X-axis direction
Point A (xa, ya) and maximum value coordinate point C (xc, yc)
, And a minimum coordinate point D (x
d, yd) and the maximum coordinate point B (xb, yb)
Stop, O from this_Three(X_Three, Y_Three) = (Xc-xa / 2, yb-yd / 2) ... (4) The geometrical center O of the lens frame_ThreeAsk for.
Rotation center O at initial measurement _Two(X₀, Y₀) And (4)
Determined center O_Three(X_Three, Y_Three) Difference x₀-X_Three=
Δx, y₀-Y_Three= Rotation of the motor 97 for Δy
Moves the eyeglass frame holding stage 90 by Δy. Also,
Δx is given by the swing amount of the carriage 13. This shaking
The movement is given by the vertical movement amount h of the abutment stop member 27.
In this embodiment, the swing radius of the rotation center of the detection arm is
M and the swing radius m of the rotating wheel 16b up to the contact point is M = 2.
Since there is a relationship of m, Δx ≈ M tan β h ≈ m tan β Therefore, Δx ≈ 2h (5)
The center of rotation of the extension arm is the geometric center of the lens frame O_ThreeMatches
Let it. Next, the detection arm 51 is rotated by the angle β to
Make corrections. Thus, the detection arm 51 is moved to the geometrical shape of the lens frame.
With the detection arm at the center of the
Or rotated by the detector and the shape information (ρn,
θn) is obtained as a digital value, and is stored.
You.

Template Measuring Means FIG. 10 is a schematic view showing a method of measuring the shape of the template when the template is used instead of the lens frame. The same components as those in FIG. 7 described above are designated by the same reference numerals, and the following description will be omitted. In the case of template measurement, the shape is measured by bringing the template detection contact 544 into contact with the peripheral surface portion 211 of the template 210 and rotating the detection arm 51. In order to put the rotation center O ₂ of the detection arm 51 in the template, it is moved from a predetermined origin 0 by a predetermined distance. Further, the radius vector tρn when the detection arm is located at the angular position θn is given as tρn = (Cn−θn / e) d−L (6), and the radius vector tρ at the reference angle θ0.
0 is given as tρ0 = Cod−L (7).

The template shape information (tpn,
θn) (n = 0, 1, 2, 3, ... N), find the geometric center of the template, move the rotation center of the detection arm to that position, measure again, and store the data. What is done is the same as in the case of the lens frame measurement described above. In the present embodiment, as shown in FIG. 5, the contact point 546a of the contact ring 546 and the target lens contact 54 that are inscribed in the groove of the lens frame.
4 are arranged so that the contact surfaces 544a of the four contact points 544a are both located on the rotation axis O ₁ of the rotary sliding shaft 543, and the contact wheel 5 is used during measurement.
46 or the contact 544 receives the contact pressure.
The rotary sliding shaft is rotated so that 5 is positioned in the direction normal to the contact surface at the contact point, and accurate measurement can always be performed.

[0024]

[Grinding work ] Next, the configuration and operation of grinding the unshaped lens based on the measured values of the lens frame or the template thus obtained will be described with reference to FIG. The unshaped lens is chucked by the lens rotation shafts 18 and 18a (see FIG. 1), the grindstone rotating motor 6 is driven to rotate the grindstone 3, and the unshaped lens is pressed against the grindstone 3 by the own weight of the carriage for processing. In the present invention, the unshaped lens LE is the shape measurement value (ρn, θn) of the above-mentioned lens frame or template (n = 0,
It is processed according to the numerical data given by 1, 2, 3, ... N). In this embodiment, a linear encoder 610 is used to check the carriage swing amount Ln. This encoder is composed of a scale 611 whose one end is rotatably attached to the side surface of the arm 31 of the lens measuring device 30 about a fulcrum P, and a detection head 612 which is also rotatably attached to the side surface of the carriage 13. Has been done. The rotation angle γ of the carriage given by the swing amount Ln of the carriage is also the same angle as the rotation angle γ of the detection head 612.

The movement of the detection head due to the rotation of the carriage is detected as a read value of the scale. Here, in the present embodiment, the scale 611 actually gives the distance C between the readings e _{1 and} e ₂ of the detection head rotatable about the fulcrum P as e ₁ ′ to e ₂ . On the other hand, an arc 613 whose radius is the distance Rs between the rotary shaft 12 of the carriage and the fulcrum P
The string length P stretched at the carriage rotation angle γ is the distance C
Encoder 6
The reading amount of 10 is directly the length of the chord of the rotation angle amount γ of the carriage, and twice the length is the swing amount Ln.
In this way, when the moving radius ρn is processed while checking the progress of the processing with the encoder 610 every moment, the female screw portion 28 of the abutting stop member 27 abuts on the rotary wheel 166, and further processing is stopped. Lens axis rotation motor 7
0 is rotated by a predetermined unit angle of the same amount as when measuring the lens frame, the lens LE is rotated to the position of θn ′, and its radial value ρ
The lens LE is processed until n ′ is obtained. This is the lens frame measurement data (ρn, θn) (n = 0, 1, 2,
3 ... N) The lens processing is repeatedly performed based on the lens frame measurement value.

Lens Measuring Means Next, the configuration of the lens measuring device 30 shown in FIG. 1 will be described with reference to FIGS. Shafts 302 and 303 are planted on a base 301 that extends vertically from the arm portion 31, one end of a link arm 304 is rotatably attached to the shaft 302, and a link arm 305 is attached to the shaft 303.
Is rotatably mounted at one end. Link arm 3
The other ends of 04 and 305 are the shafts 307 and 30 provided on the arm portions 309 and 310 at both ends of the link bar 306, respectively.
The link arms 304 and 305 and the link bar 306 constitute a parallel link mechanism. Each of the arm portions 309 and 310 has a shaft 311, 31 parallel to the running direction of the link bar 306.
Each one end of 2 is planted so as to penetrate through the deformed oval frames 317 and 318. The other end of each of the shafts 311 and 312 is rotatably fitted into a deformed oval frame 313 and 314.

A U-shaped arm 315 is provided at an intermediate portion of the shaft 311.
A shaft member 315 having a is slidably inserted on the shaft, and the shaft member 315 further includes the bearing portion 31 of the piece 316.
6a is rotatably inserted. The piece 316 has a pin 319 planted in its upper portion, and the slit 320a of the arm member 320 is slidably fitted in the stepped portion. The other end of the arm member 320 is rotatably supported by a shaft 321 planted in the base 301. Similarly, a shaft member 322 having a U-shaped arm portion 322a is slidably inserted on the shaft in the middle of the shaft 312, and the shaft member 322 is further rotatable by a bearing portion 323a of the piece 323. Has been inserted into. The piece 323 has a slit 325a formed at one end of an arm member 325 slidably fitted on a stepped portion of a pin 324 planted on the upper portion thereof. The other end of the arm member 325 is rotatably supported by a shaft 326 planted in the base 301.

Wheels 332 and 333 rotatably attached to both ends of an arm piece 331 attached to the rotation shaft of a motor 330 attached to the base 301 are in contact with the respective side surfaces of the arm members 320 and 325. There is. The detection head 3 of the encoder 334 is provided in the middle of the arm member 320.
35 is rotatably suspended around a shaft 336, and an encoder scale 337 is inserted into the detection head 335. One end of the scale 337 is a base 301
Are held rotatably. Similarly, the arm member 325
The detection head 339 of the encoder 338 is hung in the middle part of, and the scale 340 is inserted therethrough.

Frames 317 and 318 have frame 31
Two rail members 341, 342 that pass through the metal plates 3, 314 and run parallel to the link bar 306 for holding them.
Are attached at both ends. These rail members 34
Both ends of a tubular member 345 are fitted into the frames 313 and 314 held by the No. 1 and 342, respectively, and the tubular member 343 is coaxially slidably fitted in the tubular member. A groove 343a is formed on the circumferential surface at the end of the cylindrical member 343, and the U-shaped arm portion 3 of the shaft member 315 is formed in the groove 343a.
15a is rotatably inserted. Similarly frame 3
The other end of the cylindrical member 345 is fitted into the cylinder 14, and the cylindrical member 346 is rotatably fitted into the cylindrical member 345 coaxially. A groove 346a is also formed on the circumferential surface at the end of the cylindrical member 346.
Is formed in the groove 346a.
The U-shaped arm portion 322a is rotatably attached.

A ring 347 having a slope 347a and a ring 348 having a slope 348a are provided outside the cylindrical member 345.
Are slidably fitted. Slot grooves 345a are formed in the circumferential surface of the cylindrical member 345 in parallel to the axial direction. Pins 349 and 350 are penetrated into the slot grooves, and the pin 349 is connected to the ring 347 and the cylindrical member 343. . The pin 350 is connected to the ring 348 and the cylindrical member 3.
46. Further, the cylindrical members 343, 346
Pins 351 and 352 are respectively penetrated through, and a spring 353 is stretched between these pins 351 and 352. Due to the spring 353, the tubular members 343 and 346 are constantly subjected to a force to reduce the distance between them, and the ring 34 connected to these tubular members via pins 349 and 350.
7, 348 are also under force to reduce the distance between each other.

Operation of Lens Measuring Means Next, the operation of the lens measuring device having the above configuration will be described. FIG. 17 is a schematic diagram showing a method of measuring the shape of the lens LE that has been ground by the lens measuring device described above. The processed lens LE is returned to the fixed position by returning the carriage 13. Next, the eccentric cam 360 is rotated by a driving means (not shown), the lens measuring device is tilted about the shaft 12, and the cylindrical member 34 of the lens measuring device is rotated.
5 is brought into contact with the edge surface of the processing lens LE. Next, the lens rotation axis is rotated stepwise at every predetermined unit angle as in the lens processing, and the radius vector ρ ′ of the processed lens at that time is measured.

For the measurement of the radius vector ρ ', the encoder 610 used for measuring the radius vector value at the time of processing the unshaped lens described in FIG. 11 is used. At the time of processing, the radius vector was measured by the reading value of the detection head 612 which moves on the scale 611 as the carriage 13 swings. When measuring the radius vector of the processed lens in FIG. 17, the arm 31 of the lens measuring device swings. The difference is that a scale that moves with movement is read by a detection head 612 attached to a fixed carriage 13.

Next, the operation of measuring the lens curve value and the lens edge thickness by the lens measuring device 30 will be described with reference to FIGS. 18 to 20. The motor 330 of the lens measuring device is rotated to rotate the arm member 3 of the arm piece 331.
The contact with 20, 325 is released. This contact release causes the tubular members 343 and 346 to reduce their mutual distance by the tension of the spring 353. As a result, the rings 347 and 348 connected to the tubular member sandwich the edge of the processed lens LE on the slope. The movements of the tubular members 343 and 346 at this time act as rotations of the arm members 320 and 325, and the movement amounts of the arm members, that is, the movement amounts of the rings 347 and 348 are measured by the encoders 334 and 338, respectively.

Then, by rotating the motor 70,
Rotate the lens LE to obtain the radial radius for each radial line for each unit angle.
The movement amounts of the rings 347 and 348 are measured. FIG.
0, as shown in the schematic diagram of FIG.
The measured value of the ring 347 is fZ _A, The measured value at the B position is f
Z_BAnd the radius at position A is ρ '_A, The radius at position B is ρ ′
_BBefore the lens LE defined on the lens rotation axis
The center of curvature of the surface is fZo, and the radius of curvature of the front surface is Rf.
Then, ρ ′_A ^Two+ (FZo-fZ_A)^Two= Rf^Two (8) ρ '_B ^Two+ (FZo-fZ_B)^Two= Rf^Two (8) holds. Cf = n-1 / Rf × 1000 (9) Obtaining the Rf from the equation 8, the front curve value Cf of the lens is obtained from the equation 9. Note that
In equation (9), n is the refractive index of the lens, and is generally
1.523.

[0035] bZ a measurement of ring 348 _A, and bZ _B, when the center of curvature of the rear surface of the lens LE and BZO, when the curvature radius Rb of the rear ^{_{surface, ρ 'A 2 + (bZo}} -bZ A) 2 = Rb ² ···· (10) ρ ′ _B ² + (bZo−bZ _B ) ² = Rb ² ······ (10) and Rb is obtained Cb = n−1 / Rb × 1000 (11) The rear surface curve value Cb of the lens can be obtained.

[0036] In addition, edge thickness ΔA, ΔB _{is, fZ A -bZ A = ΔA ················} (12) fZ A -bZ B = ΔB ·····・ ・ ・ ・ ・ ・ ・ ・ ・ (12) FIG. 21 is a block diagram showing an electric system for driving and controlling the ball shaving machine having the above-described mechanical structure. The arithmetic control circuit 1500 composed of a microprocessor for various arithmetic operations and program control includes a Y-axis motor 97, a lens axis rotation motor 70, a lens measuring device turning motor 1208, and a carriage feed (Z-axis) motor. 40, a motor 40 for abutting movement (X-axis), and a motor driving device 12 for driving the grindstone rotating motor 6.
00 and encoders 61, 334, 338, and 610.
From the counter circuit 1100 for counting the detection signals of the frame, the frame shape memory 1300 for storing the measurement information of the spectacle frame or the template from the arithmetic and control circuit 1500, the input keyboard 1401, the liquid crystal display 1402 and the interface circuit 1403. Beage information input / output system
400 and a bevel information memory 1600 are connected.

Overall Operation of Ball Scraping Machine The operation of the ball slinging machine having the above-mentioned configuration will be described below with reference to the flowchart of FIG. (1) Lens frame measurement step Step 1-1: When a start command is input, the arithmetic and control circuit 1500 operates the motor drive device 1200 according to the program in the program memory to rotate the carriage feed motor 40 and attach it to the carriage. The detector 54 of the frame measuring device is moved to the eyeglass frame holding position.

Step 1-2: Motor driving device 120
The Y-axis feed motor 97 of the lens frame holding device 90 is rotated by 0 to move the lens frame 200 to bring the lens frame into contact with the detector 54, further advance the lens frame, and the detection arm 51.
Is positioned in the lens frame. Step 1-3: The motor drive device 1200 controls the rotation of the lens axis rotation motor 70 with the clock pulse CP from the pulse generator in the arithmetic control circuit 1500 to rotate the detection arm. The detector 54 on the detection arm follows the lens frame with which it is in contact, moves on the arm along the radius vector ρ, detects the amount of movement by the encoder 61, and outputs the detection signal by the counter circuit 1100. Count.
Since the click pulse CP from the pulse generator of the arithmetic control circuit 1500 is input to the counter circuit 1100, it is synchronized with this clock pulse, in other words, the moving radius corresponds to the rotation angle θ of the detection arm. Count ρ. Radial value group (ρn, θn) in one rotation of the detection arm (n = 0,
1, 2, ..., N) are temporarily stored in the frame shape memory 1300 via the arithmetic control circuit 1500. This step is a preliminary measurement of the frame shape.

Step 1-4: Frame shape memory 1300
Calculation control circuit 1500 based on the preliminary measurement value stored in
After the coordinate conversion according to the equation (3), the geometric center of the lens frame is obtained by the equation (4). Next, the contact stop movement (X-axis) motor 42 and the Y-axis motor 9 for positioning the center of the rotation axis of the detection arm at the obtained geometrical center.
7 and the motor 70 for rotating the lens axis
Rotate through 200. Step 1-5: The above Steps 1-3 are executed again, and the radial values (ρn, θn) of the lens frame when the geometrical center of the lens frame is the rotation axis (n = 0, 1, 2, 5)・ ・
n) is obtained, and the value is stored in the frame shape memory 1300. This is the main measurement of the lens frame.

(2) Rough grinding step Step 2-1: The motor driving device 1200 is operated to rotate the grindstone motor 6. Step 2-2: The motor drive device 1200 is operated to rotate the carriage feed motor 40, and the carriage 13
Is positioned on the rough whetstone. Step 2-3: The lens shaft rotation motor 70 is rotated by the clock pulse from the pulse generator of the arithmetic and control circuit 1500 to position the lens rotation shaft at the reference position of θ = 0. Next, the contact stop moving motor 42 is rotated and the contact stop 2
By lowering 7, the carriage 13 held thereby is swung, and the lens to be ground held by the carriage 13 is brought into contact with the rough grindstone to start the processing. At this time, the arithmetic control circuit 1500 includes the frame shape memory 1300.
The radial value ρ = ρo at the time of θ = 0 stored in is input to the control circuit as a comparison reference value.

Step 2-4: From the encoder 610
Is counted by the counter circuit 1100 based on the detection signal of
The arithmetic control circuit 1500 compares the reference value ρo with
The machining is continued at the position of the angle θ = 0 until the machining is completed. became ρo
When the contact stop movement motor 42 is rotated, the contact stop is raised.
Raise the carriage and stop the progress of lens grinding
You. Step 2-5: Rotate the lens by the motor 70
Next angle θ₁Rotate to. At this time,
The path 1500 is obtained from the frame shape memory 1300 by θ₁Corresponding to
Radial ρ₁Is read and set as a comparison reference value. Next
Then, the contact moving motor 42 is reversed, and the contact
And bring the lens to be ground into contact with the grindstone, ₁At
To work.

The grinding radius value ρ _{1 at} this time is determined by the encoder 6
10 and the signal is sent to the counter circuit 1100
In counted, as compared to the comparative reference value [rho ₁ by the arithmetic control circuit 1500, the detent motor 42 against when a [rho ₁ continued grinding is operated by the motor driving device 1200 until [rho _1, raises the carriage , Stop grinding. This step is executed until one rotation of the lens rotation axis, that is, until the rotation angle θn of the lens rotation axis is reached, and the lens frame radius vector (ρn, θn) (n = 0, 1, 2, ... ) And processing. Step 2-6: When the grinding of the lens to be ground is completed for the amount of → rotation of the lens rotation axis by the above steps, the contact stop moving motor 42 is rotated to return the carriage to the reference position, and at the same time the grindstone motor 6 rotates. To stop.

(3) Lens Measuring Step Step 3-1: The lens measuring device turning motor 1208 is rotated via the motor driving device 1200 according to a command from the arithmetic control circuit 1500 to release the holding of the lens measuring device 30 on the eccentric cam 360. Then, the measuring device 30 is rotated by its own weight to bring the cylindrical member 345 into contact with the processed lens. Step 3-2: The arm motor 330 is rotated through the motor drive device 1200 to release the holding of the arm pieces 320 and 325, and the edge of the processed lens is sandwiched by the rings 347 and 348. Step 3-3: The lens axis rotation motor 70 is rotated to rotate the rough-ground lens. The encoder 610 has a radial value ρ′n (n = 0, 1, 2, ...
· N), for example Taking Figure 20 as an example, to measure the radius vector [rho _'A in the rotation angle theta _A detection signal of the counter circuit 11
00 is counted, and the information is input to the arithmetic control circuit 1500.

The encoder 334 detects the front edge position of the rough-ground lens, that is, the fZa value at the rotation angle θ _A in FIG. 17, and causes the counter 1100 to count it. This information is input to the arithmetic control circuit 1500. Similarly, the encoder 338 detects the rear edge position of the rough-ground lens, for example, bZa at the rotation angle θ _A , and detects the counter circuit 1100.
And the result is input to the arithmetic and control circuit. As a result, the arithmetic and control circuit 1500 has each radial angle θn (n =
Front edge position information fZn (n) for each of 0, 1, 2,.
= 0, 1, 2,... N), rear edge position information bZn (n
= 0, 1, 2,... N) and the radial value ρ′n (n = 0,
1, 2, ..., N) are input, and the front surface curve C of the roughly ground lens is calculated according to the above-mentioned formulas (8) to (12).
f, rear surface curve Cb, edge thickness Δn (n = 0, 1, 2,...)
n), is calculated.

Step 3-4: Motor driving device 120
0 is operated and the motor 1208 is rotated to return the lens measuring device to the reference position by turning.

(4) Curve bevel position input step Step 4-1: Whether the display result of the bevel shape output is to be calculated automatically or to be calculated according to an arbitrary input by the user 1401
To select. Step 4-2: The calculation control circuit 1500 calculates a more ideal bevel curve and bevel position based on the above-mentioned calculation results of the front curve value Cf, the rear curve value Cb, and the edge thickness Δn, and also calculates the calculation results. And, the maximum edge thickness part,
Interface 14 with bevel cross-sectional shape of minimum edge thickness
03 is displayed on the screen of the display device 1402 via the display device 03.
Also, the necessary data such as the bevel curve value and the distance from the front edge of the edge to the bevel apex at that time are simultaneously displayed numerically.

Step 4-3: The keyboard 1401 is used to numerically input the bevel curve value desired by the user and the distance from the front edge of the edge to the apex of the bevel, the so-called offset amount. (Manual) Step 4-4: The keyboard input value is input to the arithmetic control circuit via the interface 1403, and the bevel curve value and the offset amount are input based on the curve values Cf, Cb and the edge thickness Δn. Calculating the bevel cross-sectional shape of the maximum and minimum edge thickness in
The image and the numerical value are displayed on the display unit 1402 via the.

(5) Beveling Step Step 5-1: If the bevel shape obtained by the above fourth step is confirmed and the user gives an OK, the keyboard 1
The beveling start button on 401 is operated, and the arithmetic and control circuit 1500 causes the motor drive unit 12 to operate in response to the command
00 causes the grinding wheel motor 6 to rotate. At the same time, the bevel information such as the finally determined bevel curve value and the amount of offset is stored in the bevel information memory 1600 as radial values (ρ′n, θn).
Is stored in relation to 2 Step 5-2: The carriage feed motor 40 is rotated via the motor drive device 1200 to move the rough ground lens held by the carriage onto the bevel grindstone.

Step 5-3: The abutment stop moving motor 42 is rotated by the motor driving device to lower the abutment stop 27, and the carriage 13 supported thereby is swung down to bring the lens into contact with the bevel grindstone, thereby performing beveling. Start. The arithmetic and control circuit 1500 includes the bevel information memory 1
The encoder from the counter circuit 1100 controls the carriage feed motor 40 and the contact stop movement motor 42 based on the bevel position and the offset amount for each radial value (ρ′n, θn) stored in the memory 600. While checking with the measured value of 610, beveling is performed until the desired radial value ρ'n is reached. This operation is performed for all radial angles θn. Step 5-4: When the desired radial values ρ′n have been processed for all the radial angles θn, the carriage 13 is stopped by the rotation of the motor 42 so that the carriage 13 is swung up to the home position and the rotation of the grindstone motor 6 is stopped. Stop the whetstone.

(6) Lens shape re-measurement step Step 6-1: Steps 3-1 to 3-4 are executed to obtain the radius vector value (ρ ″) of the beveled lens.
n, θn) are measured. Step 6-2: The measured value (ρ ″ n,
θn) (n = 0, 1, 2,... n) and the frame shape memory 130
0, the radial value information of the lens frame (ρn, θ
n) (n = 0, 1, 2, ..., N) is compared by an arithmetic control circuit, and if the two match, the processing completion is displayed on the display 1402 and the carriage 13 is returned to the initial position.
If they do not match, go back to step 5-2 and perform beveling again.

[0051]

As described above, the lens frame shape measuring device of the present invention comprises a holding means for holding the lens frame of the spectacle frame, and a measuring means provided with a feeler for measuring the shape of the bevel groove of the lens frame. The holding means and the measuring means are configured to be movable relative to each other, and the feeler is arranged on a plane passing through at least one point of the bevel groove of the lens frame. To do. Therefore, the feeler can be automatically arranged in the bevel groove of the lens frame, and the lens frame can be measured efficiently and highly accurately.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a lens grinding device according to the present invention,

FIG. 2 is an exploded perspective view showing a lens frame measuring device,

FIG. 3 is a perspective view of a lens frame positioning device,

FIG. 4 is a front view thereof,

FIG. 5 is a side view showing the structure of a detector for measuring a lens frame in a partial cross section,

FIG. 6 is a perspective view of a template measuring device,

FIG. 7 is a schematic diagram showing a lens frame measuring operation;

FIG. 8 is a schematic diagram showing a lens frame measuring operation;

FIG. 9 is a schematic view showing a lens frame measuring operation,

FIG. 10 is a schematic diagram showing a template measuring operation;

FIG. 11 is a schematic view showing a lens grinding step,

FIG. 12 is a perspective view of a lens measuring device,

FIG. 13 is a plan view thereof,

FIG. 14 is a cross-sectional view thereof,

FIG. 15 is a sectional view of a shaft portion,

16 is a sectional view taken along line XIII-XIII in FIG.

FIG. 17 is a schematic view showing a step of measuring a lens shape after grinding,

FIG. 18 is a perspective view of a processed lens,

FIG. 19 is a plan view showing a step of lens measurement,

FIG. 20 is a schematic view showing geometrical values of a lens shape,

FIG. 21 is a diagram showing an arithmetic processing circuit;

FIG. 22 is a flowchart of all steps.

[Explanation of symbols]

 LE lens 3 grindstone 30 lens measuring device 51 detection arm 54 detector 100 spectacle frame holder 200 lens frame 210 template

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiyuki Hatano 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Topcon Co., Ltd. (72) Inventor Hiroaki Ogushi 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Topcon Co., Ltd. Within

Claims (1)

[Claims] 1. A holding means for holding a lens frame of a spectacle frame, and a measuring means having a feeler for measuring a shape of a bevel groove of the lens frame, wherein the holding means and the measuring means are relatively arranged. A lens frame shape measuring device, wherein the feeler is arranged on a plane passing through at least one point of a bevel groove of the lens frame.