JPH07186026A - Frame shape measuring device - Google Patents

Abstract

PURPOSE:To measure a shape of a lens frame of a spectacle frame correctly by holding a feeler relatively movable along a V-groove to a device main body in the condition where it is applied to the V-groove in the lens frame of the spectacle frame held to be fixed. CONSTITUTION:A casing 201 having a reference surface for measurement is provided, and right and left lens frames 501 of a spectacle frame 500 are held by a frame holding device 100 along the measurement reference surface. A V-groove feeler 356 which is relatively movable along a V-groove in the condition where it is applied to the V-groove of the lens frame 501 of the spectacle frame 500 is supported on a sensor arm part 302 in a measuring part 300 provided at the casing 210, so it is rotatable to be inclined by a specified angle about an axial line parallel to the measurement reference surface. A motion diameter of the lens frame 501 is computated based on a motion position of the V-groove feeler 356, and result of this computation is used for grinding work of a glass lens.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for digitally measuring the shape of a lens frame of a spectacle frame or a template processed by copying the shape of the lens frame, and more particularly, an unprocessed spectacle lens in the shape of the lens frame or template. The present invention relates to a frame shape measuring device suitable for use together with a ball-sliding machine that grinds according to such information.

[0002]

2. Description of the Related Art As a frame shape measuring device of this type, as shown in FIG. 17 (a), a frame holding device (not shown) is used.
The lens frames 3 and 3 of the spectacle frame 2 are pressed against the holding surface 1 (measurement reference surface) of the main body of the main body 2 by a spring-biased holding rod (not shown), and the bevel groove 4 of the lens frame 3 is held. In some cases, the shape of the lens frame 3 of the spectacle frame 2 is measured by inscribing and moving the abacus ball-shaped feeler 5 and three-dimensionally detecting the movement trajectory of the feeler 5.

[0003]

However, since the spectacle frame 2 is generally curved as shown in 17 (a),
With the bridge 6 side connecting the pair of lens frames 3 and 3 of the spectacle frame 2 hitting the holding surface 1 (measurement reference surface), the lens frames 3 and 3 are held by a holding rod (not shown). Even if it is held by 1, the peripheral portion 7 on the side opposite to the bridge 6 side of the lens frames 3 and 3 (the portion to which the vine is attached as an ear hook) is held in a “floating” state from the holding surface 1, The holding surface 1 and the lens frame 3 are inclined (frame inclination).

By the way, in the conventional frame shape measuring apparatus, the bevel feeler 5 is rotatable about the axis O orthogonal to the holding surface 1 as shown in FIG. (Not shown). Therefore, as shown in FIG. 17 (b), the bevel feeler 5 is in contact with the bevel groove 4 with an inclination of α with respect to the extending direction of the bevel groove 4, and the bevel groove 4 is inclined as shown in FIG. 17 (c). There is a contact portion in the middle of the surfaces 4a, 4a.

As a result, at the time of measurement, the bevel feeler 5 moves along the bevel groove 4 in a state where the top 5a cannot contact the valley line 4b of the bevel groove 4 as shown in FIG. Alternatively, the lens frame 3 could not be accurately measured, because it might come off the bevel groove 4.

This is because the bevel filler 5 cannot rotate in the direction orthogonal to the axis O (rotational axis), and the curved lens frame 3 is present.
This is because it is not possible to follow the frame shape of.

Therefore, according to the present invention, the shape of the lens frame of the curved eyeglass frame is formed by the feeler tilting along the inclined bevel groove so that the top of the feeler surely abuts the valley line portion of the bevel groove. An object of the present invention is to provide a frame shape measuring device that measures accurately.

[0008]

In order to achieve this object, the present invention provides an apparatus main body provided with a measurement reference surface,
The frame holding means for holding the left and right lens frames of the spectacle frame on the apparatus main body along the measurement reference surface, and the state in which the left and right lens frames are brought into contact with the bevel groove of the lens frame of the spectacle frame held by the frame holding means. The feeler is held in the main body of the apparatus so as to be relatively movable along the bevel groove, and an arithmetic and control circuit for obtaining the radius vector information of the lens frame from the moving position of the feeler. The feeler is parallel to the measurement reference plane. A frame shape measuring device, characterized in that the frame shape measuring device is held by the device body so as to be capable of being tilted and rotated by a predetermined angle about an axis.

[0009]

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

FIG. 1 is a perspective view showing a lens frame shape measuring apparatus according to the present invention. This device is roughly divided into three parts, that is, a frame holding device portion 100 (frame holding means) that holds the left and right lens frames of the spectacle frame at the same time,
The support device unit 200 that supports the frame holding device unit 100 and controls the movement of the holding device unit into and out of the measurement surface, and the shape of the lens frame or template of the eyeglass frame is digital. Measuring unit 300 for measurement
(Measurement means). <Frame Holding Device Unit 100 (Frame Holding Unit)> The frame holding device unit 100 has a fixed base 150 as shown in FIGS. 2 and 5, and the fixed base 150 has a side 151.
a, 151a are provided and have flanges 151, 151 on both sides.

A pair of frame holding rods 152, 152 are respectively screwed to the flanges 151 at intervals in the longitudinal direction. The frame holding rods 152, 152 of the flanges 151, 151 are provided coaxially and face each other with a space therebetween.

A movable base 153 having sides 153a, 153a is inserted between the bottom plate 150a of the fixed base 150 and the flange 151. The movable base 153 is composed of two plates attached to the bottom plate 150a of the fixed base 150. It is supported by springs 154 and 154.

Two parallel guide grooves 155, 155 are formed on the movable base 153. The guide grooves 155, 1
55 on the sliders 156, 156 of the protrusions 156a, 15
6a is engaged, and the sliders 156 and 156 are slidably fitted on the movable base 153.

On the other hand, circular openings 157 and 157 are formed on both sides of the movable base 153 in the longitudinal direction.
A ring 158 is rotatably fitted in the inner circumference of the shaft 7. Two pins 159, 1 are provided on the upper surface of the ring 158.
59 are planted, and the pins 159 and 159 respectively have stepped portions 156b and 156b of the sliders 156 and 156.
It is inserted into a slot 156c formed on the (holding surface).

Further, vertical notches 156d and 156d are formed at the centers of the sliders 156 and 156, respectively.
The frame holding rod 1 described above is provided in the notches 156d and 156d.
52 and 152 can be inserted respectively. Also,
Holes 156e and 156e are formed on the upper surfaces of the sliders 156 and 156 so that the operator can easily insert his / her finger when operating the slider. <Supporting Device 200> The supporting device unit 200 has guide rails 202a and 202b installed on the housing 201 (device main body) in parallel with the vertical direction (X-axis direction of the measurement coordinate system).
A moving stage 203 is slidably installed on the guide rail, and a female screw portion 2 is provided on the lower surface of the moving stage 203.
04 is formed, and an X-axis feed screw 205 is screwed into the female screw portion 204. This X-axis feed screw 2
Reference numeral 05 is rotated by an X-axis motor 206 which is a pulse motor.

Both side flanges 207 of the moving stage 203
A guide shaft 208 is passed between a and 207b in parallel with the Y-axis direction of the measuring system, and the guide shaft 208 can be rotated by a guide shaft motor 209 (rotational drive means) attached to the flange 207a. It is configured. A single guide groove 210 is formed on the outer surface of the guide shaft 208 in parallel with the shaft. A horizontal plane including the center line of the guide shaft 208 becomes the reference measurement surface SO.

Hands 211 and 212 are attached to the guide shaft 208.
Are supported slidably in the longitudinal direction. This hand 2
Protrusions 213a and 214a are formed in the shaft holes 213 and 214 of the protrusions 11 and 212, respectively.
3a and 214a are the guide grooves 21 of the guide shaft 208 described above.
The guide shaft 20 of the hands 211 and 212
Rotation around 8 is blocked.

The hand 211 has two slopes 2 which intersect each other.
15 and 216, the other hand 212 also has two slopes 217 and 218 that intersect each other. The ridge line 220 formed by both slopes 217 and 218 of the hand 212 is parallel to the ridge line 219 formed by the slopes 215 and 216 of the hand 211 and is located in the same plane.
The angle formed by 7, 218 and the angle formed by the slopes 215, 216 are the same. And both hands 21
As shown in FIG. 8, a spring 230 is stretched between 1 and 212.

With this configuration, the hands 211 and 212
The frame holding device 100 is held between the guide shaft 2 and
08 is driven to rotate by the guide shaft motor 209, so that the hands 211 and 212 and the frame holding device 100
Is tilted up and down with respect to the reference measurement surface SO.

Rear flange 221 of moving stage 208
A pulley 222 is rotatably supported at one end thereof and a Y-axis motor 224 having a pulley 223 is attached to the other end of the rear flange 221. Pulley 223
A mini-chia belt 226 with a spring 225 interposed is stretched around 224, and pins 227 planted on the upper surface of the hand 211 are fixed to both ends of the mini-chia belt 226.

On the other hand, a collar 228 is provided on the upper surface of the hand 212.
The flange 228 is configured to come into contact with the side surface of the pin 229 planted on the rear side flange 221 of the moving stage 208 by the movement of the hand 212.

<Measurement Unit 300 (Measurement Unit)> The measurement unit 300 as a measurement unit is rotatably supported on the sensor arm rotary motor 301 attached to the lower surface of the housing 201 and the upper surface of the housing 201. A sensor arm unit 302,
The pulley 303 attached to the rotary shaft of the sensor arm motor 301 and the rotary shaft 3 of the sensor arm unit 302
04, a pulley 303, and a belt 305 stretched around a rotating shaft 304. As a result, the rotation of the motor 301 is transmitted to the sensor arm.

The sensor arm portion 302 has a base 310 having standing plate portions 310a and 310b at both longitudinal ends.
And two parallel rails 311 and 311 that are bridged between the upright plate portions 310a and 310b and the rail 31.
1, 311 are mounted movably in the longitudinal direction on a sensor head portion 312, a magnetic scale reading head 313 attached to one side surface of the sensor head portion 312, and a magnetic scale 314 attached in parallel with the rail 311.
And a spring device 315 for constantly pulling the sensor head portion 312 to the side surface of the arm end. The magnetic scale reading head 313 is configured to read the magnetic scale 314 and detect the amount of movement of the sensor head unit 312.

(Spring Device 315) FIG. 6 shows a spring device 31.
5 shows the configuration of No. 5. The spring device 315 includes a casing 317 attached to the standing plate portion 310a of the base 310, an electromagnetic magnet 318 provided in the casing 317, and a shaft hole of the electromagnetic magnet 318 so as to be slidable in the axial direction. The slide shaft 319 is formed. The slide shaft 319 extends in a direction orthogonal to the rail 311.

The slide shaft 319 has collars 320 and 321.
An extension spring 323 is interposed between the collar 320 and the casing 317, and always urges the slide shaft 319 to the left.

The clutch plate 3 is attached to the end of the slide shaft 319.
24 and 325 are rotatably supported by the clutch plate 32.
A mainspring spring 316 wound around a slide shaft 319 is arranged between 4 and 325. This mainspring 316
Has one end fixed to the clutch plate 324 and the other end fixed to the sensor head portion 312 to urge the sensor head portion 312 toward the standing plate portion 310a.

A compression spring 326 wound around a slide shaft 319 is interposed between the clutch plates 324 and 325. The compression spring 326 always keeps the clutch plate 32
The distance between the main springs 316 and the clutch plates 325 is prevented by widening the intervals of 4, 325. Further, a washer 327 is attached to the end of the slide shaft 319.

(Sensor Head Section 312) FIG. 9 shows the sensor head section 312 in which the rail 31 is movable in the longitudinal direction.
It has a slider 350 supported by 1. A shaft hole 351 formed in the vertical direction is provided in the slider 350, a sensor shaft 352 is inserted in the shaft hole 351, and a sensor shaft 352 is held between the sensor shaft 352 and the shaft hole 351. The ball bearing 353 is interposed. Thereby, the rotation of the sensor shaft 352 around the vertical axis and the movement in the vertical axis direction are made smooth.

An L-shaped arm 355 is attached to the upper end of the sensor shaft 352. This arm 3
55 is formed in an L shape from a horizontal arm portion 352a whose one end is fixed to the sensor shaft 352, and a vertical arm portion 355b which is vertically connected to the other end of the horizontal arm portion 355a so as to extend upward.

At the upper end of the vertical arm portion 355b, the bevel feeler 35 is provided via the feeler holding means 400.
6 is held.

This feeler holding means 400 is shown in FIG.
As shown in FIG. 12, the plate-shaped member 402 arranged in the direction along the horizontal arm portion 355a, the rotary shaft 403 integrally provided at the base end of the plate-shaped member 402, and the plate-shaped member 402.
Has a spring plate 404 fixed to the upper surface of and a pressing plate 405 fixed to the spring plate 404.

Further, as shown in FIGS. 12 (a) and 12 (b), mounting holes 355c are formed at the upper ends of the vertical arm portions 355b, and flanges 406 are formed in both ends of the mounting holes 355c.
a, 406a provided ring-shaped bearing body 4
06 and 406 are fitted together. A rotary shaft 403 is fitted in the bearings 406 and 406, and a fixing screw 407 is screwed to the rotary shaft 403. The rotating portions 406b and 406b of the bearings 406 and 406 are held between the fixing screw 407 and the end of the plate member 402. The axis O1 of the rotary shaft 403 is provided parallel to the measurement reference plane S0, and the sensor shaft 3
It is orthogonal to the axis O2 of 52.

Further, the bevel feeler 356 is arranged in such a manner that the tip of the spring plate 404 is sandwiched between the bevel feelers 356 and the trapezoidal sectional shape of the feeler members 356a, 356b.
It consists of A mounting shaft 356c is formed at the center of the feeler member 356a.
A mounting hole 356d is formed at the center of 6b. A mounting hole 408 is formed at the tip of the spring plate 404 as shown in FIGS. 11 and 12D.

Moreover, the mounting shaft 356c of the feeler member 356a is inserted into the mounting hole 408 of the spring plate 404 and the mounting hole 356d of the feeler member 356b.
It is fitted by light press-fitting. In this way, the filler members 356a and 356b, that is, the bevel feeler 35.
6 is rotatably held at the tip of the spring plate 404. The tip of the bevel feeler 356 is located on the axis (center line) O2 of the sensor shaft 352.

The lower part of the slider 350 and the sensor shaft 35
A sensor 358 made of, for example, a magnescale for measuring the amount of vertical movement of the sensor shaft 352 in the vertical axis direction, that is, the amount of movement of the sensor shaft 352 in the Z-axis direction is interposed between the lower portion of the sensor shaft 352 and the lower portion. The sensor 358 includes a read head 359 attached to a lower portion of the slider 350 and a sensor shaft 35.
2 is composed of a magnetic scale 360 attached to the lower part.

Further, at the lower end of the magnetic scale 360,
Pins 352a, 352a that project in a direction orthogonal to the bending direction of the arm 355 are integrally provided. The pins 352a and 352a are elastically contacted with a hanger 310h made of a leaf spring fixed to the base 310, and the arm 355, the bevel feeler 356, and the template mounting surface 314.
Is set to face the moving direction of the slider 350.

The operation of the frame shape measuring apparatus described above is controlled by the arithmetic control circuit 600 shown in FIG. Less than,
The operation control by the lens frame holding and arithmetic control circuit 600 will be described.

[Lens Frame Holding] First, a finger is inserted into the hole portions 156c and 156c of the sliders 156 and 156 shown in FIG. 2 so that the sliders 156 and 156 are sufficiently spaced from each other, and the sliders 156 and 156 are fixed. From the state of FIG. 5 to the state of FIG. 3, by pressing downward against the elastic force of the leaf springs 154 and 154, the distance between the holding rod 152 and the stepped portions 156b ′ and 156b of the sliders 156 and 156 is increased. Open enough.

Thereafter, the spectacle frame 50 is placed within this interval.
The lens frame 501 to be measured 0 is inserted, and the upper and lower rims of the lens frame 501 have sliders 156, 15
The distance between the sliders 156 and 156 is narrowed so that the sliders 156 and 156 come into contact with the inner wall.

In this embodiment, the slider 156,
Since 156 has the connecting structure by the ring 158 as described above, the amount of movement of one of the sliders 156 and 156 is equal to the amount of movement of the other slider. Next, after sliding the frame so that the approximate center of the upper rim of the lens frame 501 is below the holding rod 152,
The operator releases the sliders 156 and 156. As a result, the movable base 153 rises due to the elastic force of the leaf springs 154 and 154, and the lens frame 501 moves to the stepped portions 156b and 156b and the holding rods 152 and 1 as shown in FIGS.
It is clamped by 52. At this time, and the frame 500
Are held so that the geometrical center point of the lens frame 501 and the center point 157a of the circular opening 157 of the frame holding device 100 are substantially aligned with each other.

Further, at this time, from the apex 501a of the bevel groove of the lens frame 501 to the flange 151 of the fixed base 150.
To the side 151a of the movable base 153 and the side 15 of the movable base 153.
The distances d to 3a are configured to have the same value.

Next, after inserting the frame holding device 100 holding the frame 500 in this way between the hands 211 and 212 of the supporting device 200 set at a predetermined interval, the Y-axis motor 224 is rotated by a predetermined angle. Let The mini-chia belt 226 is driven by the rotation of the Y-axis motor 224, the hand 211 is moved leftward by a certain amount, the frame holding device section 100 and the hand 212 are also induced to move leftward, and the collar 228 is disengaged from the pin 229.

At the same time, the frame holding device section 100
As shown in FIG.
It is sandwiched between 11 and 212. At this time, the side 1 of the flange 151 of the fixed base 150 of the frame holding device section 100
51a and 152a are slopes 215 of the hand 211, respectively.
And the side 153a of the movable base 153 are respectively abutted against the slope 217 of the hand 212.
11 and the slope 218 of the hand 212.

In the present embodiment, as described above, the distances d from the apex 501a of the bevel groove of the eyeglass frame 501 to the sides 151a to 153a are equal to each other.
When the frame holding device 100 is sandwiched between the hands 211 and 212, the bevel groove apex 501a of the lens frame 501 is automatically positioned on the reference plane S formed by the ridge lines 219 and 220 of both hands.

Next, by rotating the guide shaft rotation motor 209 at a predetermined angle, the frame holding device section 100 is swung to the position shown by the two-dot diagonal line in FIG. 7, and this reference plane S is measured by the measuring section 300.
Initial position of the bevel feeler 356 (reference measurement surface S
Stop on the same plane as O).

[Feeler Arrangement on Lens Frame] Next, the Y-axis motor 224 is further rotated to make the frame holding device 100
By moving the hands 211 and 212 holding the fixed amount in the Y-axis direction by a predetermined amount, the circular opening center point 1 of the frame holding device unit 100
59a and the center of the rotating shaft 304 of the measuring unit 300 are substantially aligned with each other. At this time, on the way of movement, the bevel feeler 356
Contacts the bevel groove 502 of the lens frame 501.

The initial position of the bevel feeler 356 is, as shown in FIGS. 7 and 8, a pin 352a implanted at the lower end of the sensor shaft 352 and the base 3 of the sensor arm.
The direction is regulated by the hanger 310 a attached to the 10. This allows the Y-axis motor 224
When the spectacle frame 500 moves due to the rotation of, the feeler 356 can always enter the bevel groove.

[Lens frame shape measurement] In this state, when a measurement start button (not shown) is turned on to start the measurement,
The arithmetic control circuit 600 controls the rotation driving of the motor 301.

By this rotation drive control, the bevel feeler 356 is rotated around the axis O2 and the bevel groove 502 is rotated.
When moved along the bevel groove 502, the force from the wall surface of the bevel groove 502 inclined along with the movement causes the feeler holding member 400 and the rotating shaft 403 to move toward the bearing 40.
By being rotated around the axis O1 by 6, the bevel feeler 356 is inclined in the direction along the bevel groove 502 as shown in FIG.
16 (b), it will be completely engaged. 16 (b), the structure of the bevel feeler 356 is omitted for convenience of explanation.

On the other hand, the arithmetic control circuit 600 first rotates the motor 301 for each predetermined number of unit rotation pulses.

As a result, the sensor head 312 moves on the rails 311 and 311 according to the shape of the spectacle frame 500, that is, the radius vector of the lens frame 501, and the amount of movement is read by the magnetic scale 314 and the read head 318. . Thereby, the lens frame shape is measured as (ρ _n , θ _n ) (n = 1, 2, 3, ... N) from the rotation angle θ of the motor 301 and the reading angle ρ from the reading head 318.

Here, this measurement is performed as shown in FIG.
As shown in FIG. 4, the center O of the rotation shaft 304 is the lens frame 50.
It was measured by making it roughly coincide with the geometric center of 1.

After the measurement, the measured data (ρ _n , θ _n ) is converted from the polar coordinate-orthogonal coordinate data (X _n , Y _n ) to the measured point B (x _b , y) having the maximum value in the X-axis direction. _b), the measurement point D having the minimum value in the X-axis direction (x _d, y _d), the measurement point having the maximum value in the Y axis direction a (X _a, the minimum value y _a) and the Y-axis direction with the measured point C (x _c, y _c) to select the geometric center O ₀ of the lens frame _{O 0 (x 0, y 0} ) = ((x b + x d) / 2, (y a + y c) / 2) (1) and then the arithmetic control circuit 600 measures ( ₀ ρ _n , ₀ θ _n ) at the geometric center O ₀ (n = 1: 2: 3).
... N) is calculated. Based on these x ₀ and y ₀ values, x
The frame holding device unit 100 that drives the axis motor 206 and the Y axis motor 224 and is sandwiched by the hands 211 and 212.
And the geometrical center O ₀ of the lens frame 501 is moved.
Can be made to coincide with the rotation center O of the sensor arm 302, the lens frame shape can be measured again, and the measurement values ( ₀ ρ _n , ₀ θ _n ) at the geometric center O ₀ can be obtained.

(Measurement of data z _{n in} the Z-axis direction with respect to the radial information (ρ _n , θ _n )) When measuring the lens frame shape based on the geometrical center O ₀ , the sensor head in the Z-axis direction is used by the sensor 358. The movement amount of 312 is also measured at the same time.
As a result, the lens frame shape is ( ₀ ρ _n , ₀ θ _n , Z _n )
Three-dimensional information of (n = 1, 2, 3, ... N) will be obtained.

In the above-described radial measurement of the lens frame 501, if the bevel feeler 356 sometimes comes off from the lens frame 501 during the measurement, as shown by e in FIG. Since it largely deviates from the measurement data of, the radius change range a is defined in advance, and when it deviates from that range, the sensor arm unit 302
6 stops, and at the same time, the electromagnetic magnet 318 of the spring device 315 shown in FIG. 6 is excited to attract the collar 321.

As a result, the clutch plates 324, 325 clamp the mainspring spring 316 and prevent its winding action, so that the arm 355 of the sensor head portion 312 can be prevented from being caught in the lens frame and scratching the eyeglass frame 500. After the feeler 356 is dislocated in this way, the spectacle frame 500 is returned to the initial measurement position again and measurement is performed again.

FIG. 13 is a block diagram showing an arithmetic control circuit of the frame shape measuring apparatus of the present application. Driver circuit 60
Reference numerals 1 to 604 are connected to the X-axis motor 206, the Y-axis motor 224, the sensor arm rotation motor 301, and the guide shaft rotation motor 209, respectively. Under the control of the sequence control circuit 610, the drivers 601 to 604 control the rotational drive of each pulse motor according to the number of pulses supplied from the pulse generator 609.

The amount of movement of the read head 318 is counted by the read output counter 605 and input to the comparison circuit 606. The comparison circuit 606 compares the signal corresponding to the radius change range a from the reference value generation circuit 607 with the change amount of the count value from the counter 605, and when the count value is within the range a, the counter 605 counts. Numerical value ρ _n and pulse generator 60
The number of pulses from 9 is converted into the rotation angle of the sensor arm 355, and the value θ _n is set as a set and (ρ _n , θ _n ) is input to the data memory 611 and stored.

(Measurement of data z _{n in} the Z-axis direction with respect to radial information (ρ _n , θ _n )) Next, the sequence control circuit 610.
Switches the gate circuit 612 to the arithmetic circuit 613 side, and the radius vector information (ρ _n , θ _n ) stored in the data memory 611.
The geometric center O ₀ of the lens frame 501 is calculated based on the above, and the data is input to the sequence control circuit 610. The sequence control circuit 610 obtains x ₀ , y ₀ from the above equation (1) based on the data from the arithmetic circuit 618,
The required number of pulses is input to the drivers 601 and 608 to drive the motors 206 and 224 to match the center of the lens frame 500 with the rotation center of the sensor arm 302.

At the same time, the sequence control circuit 610
Instructs the counter circuit 615 to count the data from the Z-axis sensor 358. Then, the lens frame shape information ( ₀ ρ _n , ₀ θ _n , z _n ) including the Z-axis direction data is measured, and this data is stored in the data memory 611.
Here, if the count value ρ _n or ₀ ρ from the counter 605
_{When n} is larger than the radial change range a output from the reference value generation circuit 607, the comparison circuit 606 outputs a message to that effect to the sequence control circuit 610, and the circuit 610 receiving this output activates the driver 608. Then, the electromagnetic magnet 318 of the spring device 315 is excited to prevent the feeler 336 from moving, and the pulse supply to the driver 604 is stopped to prevent the motor 301 from rotating.

[Supply of Data to Scouring Machine] The lens frame shape information ( ₀ ρ _n , ₀ θ _n , z _n ) obtained in this way and stored in the data memory 611 is supplied to the gate circuit 612 as necessary.
Determination by determining whether or not the shape of the digital ball slicing machine, the mold taker, or the frame disclosed in Japanese Patent Application No. 58-225197 previously filed by the present applicant has been processed as designed. It is supplied to the equipment.

The curve value c of the lens frame can be calculated by the arithmetic circuit 613 as necessary from the Z _n information of the lens frame shape information ( ₀ ρ _n , ₀ θ _n , z _n ) stored in the data memory 611.

As shown in FIGS. 15 (A) and 15 (B), the calculation is carried out with the radial vectors ρ _iA and ρ _iB at at least two points a and b on the lens frame and the movement of the sensor head in the Z-axis direction at these two points. From the values Z _A and Z _B , the radius of curvature R of the sphere SP including the bevel locus of the lens frame 501 is R ² = ρ _iA ² + (Z ₀ −Z _A ) ² R ² = ρ _iB ² + (Z ₀ −Z _B ) ² ... (2), and the bevel curve value c is obtained from R. C = {(n-1) / R} × 1000 (3) (where n is a constant n = 1.523) Run as.

The sequence control circuit executes the above-mentioned measurement steps by a program built in the program memory 614.

Further, the finished lens L processed based on the data obtained in this way is shown in FIG.
As shown in (4), the dimension is processed to be almost the same as the dimension d. Note that, in FIG. 16C, the finished size of the lens L and the true size d are shown to be slightly different for convenience of description, but in reality, the finished size of the lens L and the true size d are almost the same. It will be formed in the same size.

In addition, the rotary shaft 403 described above is interlocked with a rotary encoder via a pulley and a wire, and an output signal from the rotary encoder is input to the arithmetic control circuit 600, and the arithmetic control circuit 60 is based on this signal.
By calculating the tilt angle of the bevel feeler 356 with 0, it is possible to know how much the lens frame 501 of the spectacle frame 500 is tilted with respect to the reference measurement surface S0, and more suitable for the shape of the lens frame 501. It is also possible to enable shape measurement.

[0067]

[Effects] Since the present invention is configured as described above, the feeler is tilted following the tilted bevel groove,
By reliably engaging and abutting the top of the feeler with the bevel groove, it is possible to accurately measure the shape of the lens frame of the curved eyeglass frame.

[Brief description of drawings]

FIG. 1 is a perspective view showing a frame shape measuring device according to the present invention.

FIG. 2 is a perspective view showing the relationship between the frame holding device shown in FIG. 1 and glasses.

FIG. 3 is an operation explanatory view of the frame holding device shown in FIGS.

FIG. 4 is an operation explanatory view showing a state in which the frame holding device shown in FIGS. 1 and 2 holds glasses.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a cross-sectional view of the spring member shown in FIG.

FIG. 7 is a schematic diagram showing the relationship between the support device section and the sensor section shown in FIG.

8 is a cross-sectional view showing the relationship between the support device section and the sensor section shown in FIG.

9 is a front view showing a cross section of a part of the sensor unit shown in FIGS. 1, 7, and 8. FIG.

10 is a perspective view of the bevel feeler mounting portion shown in FIG. 9. FIG.

11 is an exploded perspective view of the feeler holding member and the bevel feeler shown in FIGS. 9 and 10. FIG.

12A is a plan view showing a cross section of a portion of the bevel feeler mounting portion shown in FIG. 9, and FIG. 12B is a side view showing a cross section of a portion of the bevel feeler mounting portion. (c) is a left side view of (b), (d) is a sectional view taken along the line AA of (a).

FIG. 13 is a control circuit of the frame shape measuring device shown in FIGS.

FIG. 14 is a schematic diagram for obtaining the geometric center of a measured value of a lens frame.

15A and 15B are explanatory diagrams for calculating a curve value C of a lens frame.

16A is an explanatory view of the action of the bevel feeler by the frame shape measuring device shown in FIGS. 1 to 12, and FIG. 16B is a diagram showing FIG.
3B is a cross-sectional view taken along line BB of FIG. 4C, and FIG. 7C is an explanatory diagram of a lens and a lens frame that are ground based on the lens frame shape data measured by the frame shape measuring device.

FIG. 17 is an explanatory diagram of frame frame shape measurement and measurement of a conventional eyeglass frame.

[Explanation of symbols]

 Reference numeral 100 ... Frame holding device (frame holding means) 156b ... Stepped portion (holding surface) 210 ... Housing (apparatus body) 209 ... Motor (tilt rotation means) 300 ... Measuring unit (measurement means) 356 ... Bevel feeler 400 ... Feeler Holding means 500 ... Glasses frame 501 ... Lens frame 502 ... Bevel groove 503 ... Center line 600 ... Calculation control circuit SO ... Measurement reference plane

Claims (1)

[Claims] 1. A device main body provided with a measurement reference surface, frame holding means for holding the left and right lens frames of an eyeglass frame on the device main body along the measurement reference surface, and a frame holding means. A feeler held by the apparatus main body so as to be relatively movable along the bevel groove while being in contact with the bevel groove of the lens frame of the spectacle frame, and the radius vector information of the lens frame is obtained from the moving position of the feeler. A frame shape measuring device comprising an arithmetic control circuit, wherein the feeler is held by the device body so as to be capable of tilting and rotating at a predetermined angle about an axis parallel to the measurement reference plane.