JPH0639048B2 - Lens shape measuring device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the formation of a spectacle lens in which a lens is framed in a lens frame of a spectacle frame, and more specifically, lens shape measurement for measuring an edge thickness and a radial length. Regarding the device.

Prior Art In order to frame a lens in the lens frame of an eyeglass frame,
A template-type lens grinding device for grinding a textured eyeglass lens based on a template processed according to the shape of a lens frame has been put into practical use.

On the other hand, the applicant directly digitally measures the lens frame of the spectacle frame in order to eliminate the inconvenience of creating a template in the lens grinding device of the template method, and directly determines the cloth spectacle lens based on the measured value. A direct lens grinding machine for grinding is proposed in Japanese Patent Application No. 58-225197.

By the way, both of the above-described lens grinding devices have a bevel grindstone for forming a bevel on the lens for supporting the lens in the frame groove of the lens frame.

Problems to be Solved by the Present Invention Important points for beveling are two points, that is, the position of the bevel apex at the edge and the bevel curve. Here, the bevel curve is a curve value that specifies a spherical surface formed by a bevel vertex locus connecting the vertices. Ideally, when the lens to be processed has a refractive power of +2 to -3 diopters, the bevel apex position is formed at a position of 4: 6 which is the edge thickness of each radius of motion of any lens radius. That is.

However, in reality, it is extremely difficult to process such an ideal bevel vertex position or bevel to have a predetermined bevel curve. Because conventionally, only the bevel apex position and bevel curve depend on the operator's perception and experience, and what kind of bevel is formed on the lens to be processed can be known without actually processing. Because there is no. As a result, I often even made "trial cuts".

In particular, the beveling process is the process that requires the most attention because the beveling process is directly linked to the inability to frame the lens and the occurrence of burrs and cracks when the frame is framed or worn.

Another problem is that it is not possible to determine whether the lens after grinding has been processed into a size that fits the lens frame to be framed without actually performing the frame frame work. is there. Therefore, after finishing the grinding work, remove the lens from the lens grinding machine, determine the frame fitting work and the suitability of the frame fitting, and if the processed lens is larger than the lens frame, chuck the lens again to the grinding machine and perform the second grinding. It was necessary to set the grinding amount for processing, re-grinding, and work that was extremely complicated and required experience and experience.

Both of the above problems are mainly due to the fact that the formation of the lens to be processed, the measurement of the edge thickness and the processed moving radius length are not mainly performed, or there is no measuring device therefor.

OBJECT OF THE INVENTION A first object of the present invention is to provide a lens shape measuring device capable of measuring the edge thickness of an expected edge that will be formed on a lens to be processed before and after processing the lens. .

A second object of the present invention is to further provide a lens shape measuring device capable of measuring the machining radius length of the bevel apex of the lens after the lens is processed.

According to the present invention, there is provided a lens rotation shaft for sandwiching an unprocessed lens and rotatably supporting the lens, and a lens which is brought into contact with a front refracting surface and a rear refracting surface of the lens to be processed. The lens to be processed having a predetermined relationship with the virtual edge locus obtained from the shape data of the lens frame of the spectacle frame to be framed or the shape data of the lens to be processed by the template having the shape of the lens frame Based on the feeler section arranged on the measurement locus, a moving unit that moves the feeler section so as to be separated from the measurement locus of the lens to be processed, and detection information in the lens rotation axis direction by the feeler section. A lens shape measuring device, comprising: a control unit for determining an edge thickness that will be formed after the beveling of the lens to be processed.

Further, the present invention provides a lens rotation shaft for sandwiching an unprocessed lens and rotatably supporting the lens, and a bevel apex after the beveling by contacting a front refracting surface and a rear refracting surface of the lens. And a virtual edge locus obtained by the shape data of the lens frame of the spectacle frame into which the lens to be processed is copied or processed by a template having the shape of the lens frame to obtain the shape data of the lens to be processed. A feeler portion arranged on a measurement locus of the processed lens having a correlation and at a bevel apex after beveling, a moving unit that moves the feeler portion so as to separate from the measurement locus of the processed lens, Based on the detection information in the lens rotation axis direction by the feeler unit, the edge thickness that will be formed after the beveling of the lens to be processed is obtained, and A lens shape measuring apparatus characterized by a control means for determining the processing radius vector length of the uncut lens based on the lens radius vector information after beveling by dealers unit.

Effects of the Invention As will be understood in more detail from Examples described later, according to the present invention, the edge thickness and the working radius length of the lens to be processed can be measured. It has an advantage that it can be easily determined whether or not it is processed into a shape, and the complexity of removing the lens from the grinding device, putting it in a frame, and then determining the adequacy of the grinding as in the conventional case can be eliminated.

Also, according to this lens grinding device, the bevel apex position and the bevel curve can be obtained based on the edge thickness data, the obtained calculation result can be displayed, and the bevel position and the bevel curve can be calculated as in the past. Therefore, there is an advantage that it is not necessary to estimate it by experience or to carry out trial cutting.

(Embodiment) Overall Configuration of Apparatus FIG. 1 is a perspective view showing the overall configuration of a lens grinding apparatus according to the present invention in a partially cutaway section. A frame shape measuring device 200, which will be described later, is incorporated in the lower front part of the housing 1, and an opening 10 for inserting and removing the frame holder is formed in the front side wall surface of the housing 1. A vertically openable door 10a is attached below the opening. Also,
A keyboard 1000 and a display device 2000, which will be described later, are vertically arranged side by side on the upper right side of the front wall surface.

In the grindstone chamber 30 of the housing 1, the rough grindstone 3 for glass lens is used.
A grindstone 3 including a, a rough grindstone 3c for a plastic lens, a bevel grindstone 3b, and a flat precision grindstone 3d is fixed to a rotary shaft 31. The rotating shaft 31 is the grindstone chamber 30.
It is rotatably supported on the wall surface and has a pulley 53 at its end.
Is installed. The pulley 53 is connected via a belt 52 to a pulley 51 attached to the rotating shaft of a grindstone rotating motor 5 composed of an AC drive motor. With this configuration, when the motor 5 rotates, the grindstone 3 rotates.

A shaft 11 is axially slidably supported by a bearing 12 of the housing 1, and the carriage 2 is supported on the shaft 11.
Rear arms 33a and 33b are rotatably supported. Lens rotation shafts 28a and 28b are coaxially and rotatably supported by the front arms 34a and 34b of the carriage 2. The lens rotation shaft 28a on the right side in FIG.
Has a lens chucking mechanism having a known structure, and can be moved back and forth in the axial direction by the rotation of the chucking handle 29 to hold the lens LE to be processed by the rotary shafts 28a and 28b.

On the other hand, on the outer end of the left lens rotation shaft 28b, a disc 27a that comes into contact with an abutting stopper 42 described later and a template holding portion 27b for holding the template are attached.

Pulleys 26a and 26b are attached to the lens rotation shafts 28a and 28b, respectively.
Drive shaft 2 having pulleys 23a, 23b at both ends
5 is built in. A worm wheel 22 is attached to one end of the drive shaft 25, and meshes with a worm gear 21a attached to the rotation shaft of a lens shaft rotation motor 21 which is a pulse motor. Timing belts 24a, 24 are provided between the pulleys 23a, 23b and the pulleys 26a, 26b.
b is hung over. With these configurations, the rotation of the motor 21 is converted into the rotation of the lens rotation shafts 28a and 28b,
The lens LE to be processed is rotated. On the other hand, a lens measuring device 600 described later is built in the carriage 2.

The end of the shaft 11 has a frame 4 for moving the carriage.
Is fitted to the arm 40 of the. The frame 4 is slidably supported by a shaft 41 attached to the housing 1, and a feed screw 61 is screwed into the frame 4. The feed screw 61 is fixed to a rotary shaft of a carriage moving motor 60 including a pulse motor. With this configuration, when the motor 60 rotates, the frame 4 moves in the left-right direction, and the carriage 2 moves in the left-right direction via the shaft 11. The frame 4 is also provided with an after-mentioned stop device 42 and a grinding pressure control device 43. Grinding pressure control device 43
A pin 43a planted on the carriage 2 is brought into contact with.

2 is a sectional view of the frame 4 in FIG. 1 taken along the line II-II '. The stopper device 42 is a stopper stopper vertical motor 420 that is a pulse motor disposed on the lower surface of the frame 4.
And a column 421 and a stopper member 422. Lead screw 4 attached to the rotating shaft of motor 420
Reference numeral 23 is screwed into the female screw portion 424 of the column 421. A key 425 is planted on the side surface of the support column 421, and the key 425 is fitted into the key groove 44 formed in the frame 4.

A photo sensor unit 427 is attached to the table portion 426 at the upper end of the column 421. Stop member 4
22 is attached to the table portion 426 by a shaft 428 rotatably fitted in the end portion of the table portion 426 so as to be rotatable around a shaft 428 as a rotation center. Stop member 4
A spring 470 is interposed between the table 22 and the table portion 426, and the action of this spring 470 causes the stopper member 422 to stop.
Is always lifted upward as shown by the chain double-dashed line.

A light-shielding rod 429 is attached inside the contact-preventing member 422, and the contact-preventing member 422 is located between the photosensor units 427 when pushed down, and the unit 42 is attached.
It acts so as to block the light running in 7. Further, an eccentric cam 471 is mounted inside the contact stop member 422, and by rotating this, the distance between the cam surface and the table portion can be changed to finely adjust the stop position of the contact stop member 422. An arcuate portion 422a having the same curvature as that of the rough grindstone 3a and a horizontal cutting surface 422b are formed on the upper surface of the contact stop member 422.

During the grinding process using the template, the template SP attached to the carriage 2 contacts the arc-shaped portion 422a. Further, the horizontal cut surface 422b is brought into contact with the disk 27a when grinding is performed using the lens frame shape measurement data of the frame. By the way, in the present embodiment, the detection of the template is performed by the contact of the template with the contact stop member 422 as described above, but the present invention is not limited to this. For example,
A method of checking the movement of the template, that is, the processing progress of the lens depending on the presence or absence of the edge of the template between the photosensor units may be used.

The grinding pressure control device 43 includes a pulse motor 432 having a feed screw 431, a piston 434 screwed with the feed screw 431 and a female screw portion 433, and a cylinder 435 slidably mounted on the outer wall of the piston 434. And cylinder 435
And a spring 436 arranged between the piston 434. A key 43 is provided on the outside of the flange of the piston 434.
7 is planted, and this key 437 is fitted in a key groove 45 formed in the frame 4. Cylinder 435
The upper surface 435 a of the pin 43 attached to the carriage 2.
It contacts the side surface of a and supports the own weight of the carriage 2 by the elastic force of the spring 436. When the piston 434 is moved up and down via the feed screw 433 by the rotation of the motor 432, the amount of compression of the spring 436 changes, and the amount of force that supports the carriage 2 also changes, so that the lens LE to be processed is ground to the grindstone 3. Lens Frame Shape Measuring Device That Can Change Pressure Next, the configuration of the lens frame shape measuring device 200 will be described with reference to FIGS. 3 to 10. FIG. 3 is a perspective view showing a lens frame shape measuring device according to the present invention. This apparatus is roughly divided into three parts, that is, a frame holding device section 100 for holding a frame, a frame holding apparatus section 100 that supports the frame holding apparatus section 100, and transfers the holding apparatus section into and out of the measurement surface. Support device unit 200A that controls movement
And a measuring unit 300 for digitally measuring the shape of the lens frame or template of the eyeglass frame.

The supporting device section 200A has a housing 201. Case 201
Has feet 253, 254, and these feet 253, 254
Is a rail 25 attached to the housing 1 of the lens grinding machine
It is slidably mounted on 1, 252. Again door 1
0a has a rail 255256, and when the door 10a is opened, each of the rails 255 and 256 has a rail 25256.
It is configured to be located on the extension line of 1,252.
With this configuration, the operator can slide the housing 201 out of the apparatus housing 1 as necessary.

The housing 201 also has a guide rail 202 installed on the housing 201 in parallel with the vertical direction (X-axis direction of the measurement coordinate system).
The moving stage 203 is slidably mounted on this guide rail. Moving stage 2
A female screw portion 204 is formed on the lower surface of 03, and an X-axis feed screw 205 is screwed into the female screw 204. This X-axis feed screw 205 consists of a pulse motor X
It is rotated by the shaft motor 206.

Both side flanges 207a and 207b of the moving stage 203
A guide shaft 208 is provided in parallel with the Y-axis direction of the measurement coordinate system, and the guide shaft 208 is configured to be rotatable by a guide shaft motor 209 attached to the flange 207a. A single guide groove 210 is formed on the outer surface of the guide shaft 208 in parallel with the shaft. Hands 211 and 212 are slidably supported on the guide shaft 208. Shaft holes 213214 of these hands 211, 212
Projections 213a and 214a are formed on the respective guides 213a and 214a.
08 is engaged in the guide groove 210, and the hands 211, 21
The rotation around the second guide shaft 208 is prevented.

The hand 211 has two slopes 215 and 216 that intersect with each other.
On the other hand, the other hand 212 also has two slopes 217 and 218 that intersect each other. The ridge line 220 formed by both slopes 217, 218 of the hand 212 is positioned parallel to and in the same plane as the ridge line 219 formed by the slopes 215, 216 of the hand 211, and the angle formed by the slopes 217, 218 and the slope 215, The angles formed by 216 are the same. A spring 230 is stretched between the hands 211 and 212 as shown in FIG. 7 (B). In addition, the notches 2 are formed on the slopes 215 and 217, respectively.
15a and 217a are formed.

An arm 241 having a contact wheel 242 at one end is attached to the hand 212 so as to be rotatable around the other end.
This arm 241 has a spring 243 and a micro switch 2
It is always in contact with 44. The contact wheel 242, the arm 241, the spring 243, and the micro switch 244 constitute the left and right eye determination device 240 of the frame.

A pulley 222 is rotatably supported at one end of the rear flange 221 of the moving stage 203.
A Y-axis motor 224, which is a palm motor having a pulley 223, is attached to the other end of 1. A mini-chia belt 226 with a spring 225 interposed is wound around the pulleys 223 and 224.
Both ends of 226 are pins 22 planted on the upper surface of the hand 211.
It is fixed to 7. On the other hand, on the upper surface of the hand 212,
A collar 228 is formed, and this collar 228 is used for the hand 21.
2 by the movement of the moving stage 203 rear flange 22
It is configured so as to abut on the side surface of the pin 229 implanted in 1.

The measuring unit 300 includes a sensor arm rotation motor 301 that is a pulse motor attached to the lower surface of the housing 201 and a sensor arm unit 302 that is rotatably supported by the upper surface of the housing 201. A belt 305 is stretched between a pulley 303 attached to the rotation shaft of the motor 301 and a rotation shaft 304 of the sensor arm portion, and the rotation of the motor 301 is transmitted to the sensor arm portion 302.

The sensor arm portion 302 has two rails 311 and 311 that are provided above the base 310, and the sensor head portion 312 is slidably mounted on the rails 311 and 311. A magnetic scale reading head 313 is attached to one side surface of the sensor head portion 312,
Thereby, the magnetic scale 314 attached to the base 310 in parallel with the rail 311 is read to detect the amount of movement of the sensor head portion 312. Further, on the other side of the sensor head portion 312, one end of a constant torque spring 316 of a spring device 315 that constantly pulls the head portion 312 toward the arm end side surface is fixed.

FIG. 6 shows the structure of the spring device 315. An electromagnetic magnet 318 is provided in a casing 317 attached to the base 310 of the sensor arm portion 302, and a slide shaft 319 is fitted in a shaft hole of the magnet 318 so as to be slidable in the axial direction. The slide shaft 319 has flanges 320 and 321. A spring 323 is interposed between the flange 320 and the wall of the casing 317, and the spring 323 is provided.
Thus, the slide shaft 319 is always moved to the left in FIG. Clutch plates 324 and 325 are rotatably supported at the ends of the slide shaft 319, and one end of a constant torque spring 316 is fixed to one clutch plate 324. A spring 326 fitted with a slide shaft 319 is interposed between the two clutch plates 324 and 325, and the gap between the clutch plates 324 and 325 is always widened to prevent contact between the constant torque spring 316 and the clutch plate 325. . Further, a washer 327 is attached to the end of the slide shaft 319.

FIG. 8 shows the structure of the sensor head part 312. A shaft hole 351 is formed in the slider 350 supported by the rail 311 in the vertical direction, and a sensor shaft 352 is inserted into this shaft hole 351. Sensor shaft 352 and shaft hole 3
A ball bearing 353 held by the sensor shaft 352 is interposed between the sensor shaft 51 and the sensor shaft 51.
The rotation about the vertical axis and the movement in the vertical axis are smoothed.

An arm 355 is attached to the center of the sensor shaft 352, and an upper portion of the arm 355 has a soroban-ball shape having an inclination equal to the bevel inclination angle of the bevel grindstone 3b which is brought into contact with the bevel groove of the lens frame. A bevel feeler 356 is rotatably supported. The circumferential point of the bevel feeler 356 is arranged on the center line of the vertical sensor shaft 352.

Next, the structure of the frame holding device section 100 will be described with reference to FIGS. 4 (A) and 5. Side 151 of fixed base 150
Frame holding rods 152, 152 are screwed to the centers of both side flanges 151, 151 having a, 151a. Further, inverted U-shaped bridges 151b and 151c are fixed to the flanges 151 and 151. The bridges 151b and 151c connect the holding device 100 to the hand 21.
It is provided to prevent the insertion of the holding device by abutting the shoulders of the notches 215a and 217a of the hand when the insertion direction between the first and second parts is not proper. Bottom plate 150a of fixed base 150 and flange 151
A movable base 153 having sides 153a and 153a is inserted between the movable base 153 and the fixed base 150.
Two leaf springs 154, 1 attached to the bottom plate 150a of the
It is supported by 54.

The movable base 153 has two parallel guide grooves 155, 1
55 is formed, and as shown in FIG. 5, the guide groove 1
55 and 155, and the projecting legs 156a of the sliders 156 and 156,
156a is engaged, and sliders 156 and 156 are slidably mounted on the movable base 153. On the other hand, a circular opening 157 is formed in the center of the movable base 153,
A ring 158 is rotatably fitted on the outer periphery thereof. Two pins 159, 1 are provided on the upper surface of the ring 158.
59 are planted, and the pins 159 and 159 are inserted into the slots 156c formed in the stepped portions 156b and 156b of the sliders 156 and 156, respectively.

Further, vertical notches 156d and 156d are formed in the centers of the sliders 156 and 156, respectively.
The frame holding rods 152 and 15 described above are provided in 6d and 156d.
2 can be inserted respectively. Further, on the upper surfaces of the sliders 156 and 156, there are holes 156e for facilitating the operator to insert his / her finger when operating the slider,
156e is formed.

Next, FIG. 4 (B), (C) and FIG. 7 (A), (B)
The operation of the frame shape measuring apparatus described above will be described based on FIG. First, as shown in FIG. 4 (B), the slider 15
6, fingers are inserted into the holes 156e, 156e of the holes 156e, 156e to sufficiently open the mutual gaps of the sliders 156, 156 and press downward, and together with the movable base 153, the leaf spring 154,
The holding rod 152 and the slider 15 resist the resilience of 154.
6, 156 and the stepped portions 156b and 156b are sufficiently spaced apart. After that, the lens frame 501 of the eyeglass frame 500 to be measured is inserted into this space, and the lens frame 50
The distance between the sliders 156 and 156 is narrowed so that the upper rim and the lower rim of No. 1 contact the inner walls of the sliders 156 and 156. In this embodiment, the sliders 156, 1
Since 56 has the connecting structure by the ring 158 as described above, one of the sliders 156 and 156 gives the same amount of movement as it is to the other slider.

Next, the holding bar 15 is located approximately in the center of the upper rim of the lens frame 501.
After sliding the frame 500 so as to be below 2, the movable base 153 is repulsed by the leaf springs 154 and 154 when the operator releases his or her hand from the sliders 156 and 156. The lens frame 50 is raised by the force.
1 is sandwiched between the stepped portions 156b and 156b and the holding rods 152 and 152, and the frame 500 substantially coincides with 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. To be held. Further, at this time, from the apex 501a of the bevel groove of the lens frame 501 to the side 1 of the flange 151 of the fixed base 150.
The distance d to 51a and the distance d to the side 153a of the movable base 153 are configured to have the same value.

Next, as shown in FIG. 7 (A), the frame holding device unit 100 holding the frame 500 in this way, as shown in FIG.
Insert between 212. At the same time, the left and right eye determination device 2
When the contact wheel 242 is abutted by the frame 500 and the arm 241 is rotated, the micro switch 40
The contact No. 4 is turned off. Accordingly, the determination device 240 automatically determines that the measured lens frame 501 is for the left eye. Next, the Y-axis motor 224 is rotated by a predetermined angle. The mini-chia belt 226 is driven by the rotation of the Y-axis motor 224, the hand 211 is moved to the left by a certain amount, the frame holding device section 100 and the hand 212 are also induced to move to the left, and the brim 228 is disengaged from the pin 229. At the same time, the frame holding device section 100 uses the tension spring 230 to hold both hands 2
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 slope 217 of the hand 212, and both sides 153a and 153a of the movable base 153 contact the slope 216 of the hand 211 and the slope 218 of the hand 212, respectively.

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 and 153a are equal to each other, so that 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 ridgelines 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 chain double-dashed line in FIG. 7 (A), and this reference plane S is measured by the bevel feeler 356 of the measuring section 300. Stop on the same plane as the initial position.

Next, the Y-axis motor 224 is further rotated to move the hands 211 and 212 holding the frame holding device unit 100 by a certain amount in the Y-axis direction, and the circular opening center point 159a of the frame holding device unit 100 and the measurement unit 300 are rotated. The axis 304 center is approximately matched. At this time, the bevel feeler 356 contacts the bevel groove of the lens frame 501 during the movement.
The initial position of the bevel feeler 356 is shown in FIG.
As shown in (B), the pin 352a implanted at the lower end of the sensor shaft 352 is attached to the base 31 of the sensor arm portion.
The direction is regulated by abutting on the hanger 310a attached to 0. As a result, when the spectacle frame 500 moves due to the rotation of the Y-axis motor 224, the feeler 356 can always enter the bevel groove.

Then, the motor 301 is rotated every predetermined number of unit rotation pulses. At this time, the sensor head portion 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 movement amount is read by the magnetic scale 314 and the reading head 313.

From the rotation angle θ of the motor 301 and the reading amount ρ from the reading head 313, the lens frame shape is (ρ _n , θ _n ) (n =
It is measured as 1, 2, 3 ... N). Here, as described above, in the first measurement, as shown in FIG. 9A, the center O of the rotating shaft 304 is measured so as to substantially coincide with the geometric center of the lens frame 501. . Therefore, the second measurement is the first measurement data (ρ _n , θ _n ).
Data (X _n , Y _n ) after polar coordinate conversion to rectangular coordinate conversion
From the measured point B (x _b , which has the maximum value in the X-axis direction,
y _b ), the measured point D (x _d , y having the minimum value in the X-axis direction
_d ), the measured point A (x _a , which has the maximum value in the Y-axis direction,
y _a) and Y the measurement point having the minimum value in the axial direction C _(x c,
y _c ), select the geometric center O _o of the lens frame Frame 500 that is schematically input in FIG. 9B and is input in advance from the keyboard 1000 described later.
From the distance FPD between the geometrical centers of both lens frames and the distance PD between the pupils of the wearer's eyes, (FPD-PD) / 2 = I is obtained to obtain the inward displacement amount I, and the upward displacement amount U from the keyboard 1000 is also calculated. Is the pupil position of the wear eye, that is, the position O _s ( _s X _o , _s Y _o ) at which the optical center of the lens to be processed should be located. Ask as. Based on these _s X _o and _s Y _o values, the X-axis motor 206 and the Y-axis motor 224 are driven, and the hand 2
The frame holding device section 100 sandwiched by 11, 212 is moved so that the pupil center position O _s of the lens frame 501 coincides with the rotation center O of the sensor arm 302, and the lens frame shape is measured again to determine the pupil center position. A measured value ( _s ρ _n , _s θ _n ) (n = 1, 2, 3, ..., N) at O _s is 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 measurement, the radial measurement data is changed as shown by e in FIG. 9 (A). Since it greatly deviates from the immediately preceding measurement data, the radius vector change range a is defined in advance, and when deviating from the range, the rotation of the sensor arm portion 302 stops, and at the same time, the electromagnetic magnet of the spring device 315 shown in FIG. 318 is excited and the collar 321 is attached. As a result, the clutch plates 324 and 325 sandwich the constant torque spring 316 and prevent the winding action thereof, so that it is possible to prevent the arm 355 of the sensor head portion 312 from being caught in the lens frame and scratching the eyeglass frame 500. After the feeler 356 is dislocated in this way, the eyeglass frame 500 is returned to the initial measurement position again and measurement is performed again. If the bevel feeler 356 does not come off the frame 500, the door 10a (first
(See FIGS. 3A and 3B) is opened and the housing 201 can be pulled out, so that the operator can easily remove the feeler.

Lens Measuring Device Next, a lens measuring device for detecting the radius vector, edge thickness, curve value, etc. of the lens to be processed built in the carriage 2 will be described with reference to FIGS. 11 to 13 (C). explain.
The base frame 601 has two parallel guide rails 60.
2, 602 are provided, and a movable base 603 is slidably arranged on the rail 602. Moving table 603
The feed screw 604 is screwed into the
Reference numeral 4 is driven by a lens radius sensor motor 605 which is a pulse motor.

A moving frame 610 is fixed to the upper surface of the moving table 603. Rear wall piece 611 of movable frame 610 and movable base 6
Two parallel rails 612 (only one of which is shown in FIG. 12) are passed between 03, and a suspension base 613 is slidably mounted on the parallel rails 612. A constant torque spring member 614 is disposed between the suspension base 613 and the base frame 601 and acts so as to bring the suspension base 613 into contact with the rear surface of the moving base 603 at the initial stage. An arm 621 of the lens radius sensor 620 is fixed to the front side surface of the suspension base 613.

As shown in FIG. 13, a modified H-shaped hand arm 623 is provided on the cono-shaped flange 622 at the tip of the arm 621.
However, it is attached to one end thereof so as to be rotatable around the axis O ₃ . At the other end of the hand arm 623, two oval pieces 624, 624 are rotatably supported around a rotation center O ₁ . A contact ring 625 having a circular cross section that is in contact with the axis O ₁ is rotatably mounted between the two oval pieces 624 and 624 so that the axis O ₂ serves as a rotation axis. Matching of the contact surfaces of the axis O ₂ and the contact ring 625 and the oval piece 624.
When the contact ring 625 comes into contact with the edge of the processing lens LE as shown in FIG. 13B (B), the contact point P becomes the axis A of the arm 621 due to the rotatability about the axis O ₂ of. It matches with the matching lens radius vector l. Therefore, for example, it is possible to eliminate the error Δ that occurs when the contact wheel 625 is fixedly supported by the hand arm 623 without providing the oval-shaped piece 624 as shown by the chain double-dashed line in the figure.

The central arm portion 626 and the arm 62 of the hand arm 623
A spring 627 is hooked between 1 and acts so as to pull up the hand arm 623 at all times. The hand arm 623 is kept horizontal by a stopper piece 628 formed at the tip of the arm 621. As shown in FIG. 13 (C), the configuration of the hand arm 623 is such that the processing lens LE is largely cut and a crack or the like is generated to cause the contact ring 62.
This is to prevent the hand arm 623 and the contact ring 625 from being damaged by the clockwise rotation of the lens when the number 5 falls into the cut oyster. That is, when a force exceeding the limit is applied to the hand arm 623, the hand arm 623 pivots about the axis O ₃ against the tension of the spring 627. When the spring 627 crosses the axis B connecting the axis O ₃ and the fixing point of the spring 627, the hand arm 623 causes the spring 627 to move.
It swivels rapidly with the tension of 1 to retract from the lens LE to prevent self-damage.

As shown in FIG. 12, a detection head 615a of a magnetic encoder 615 is attached to the lower end of the suspension base 613, and a scale 615b implanted on the base arm 601.
Has been inserted. With this configuration, the movement amount of the lens radius vector measuring member 620 is detected, and accordingly, the radius vector ρ ′ _i (i = 1, 2, 3, ..., N) of the processed lens LE is measured.

Next, the configuration of the lens surface shape sensor for obtaining the edge thickness of the lens and the Kagen curve value will be described. As shown in FIG. 11, the moving frame 610 is provided with two parallel guide rails 630 and 630.
30, 630 slidably movable stages 631, 632
And free stages 633 and 634 are attached. The moving stage 631 and the free stage 633 are springs.
It is connected by 635 and 635. Similarly, the moving stage 63
2 and the free stage 634 are connected by springs 636 and 636.

A feed screw 638, which is rotatably driven by a feeler motor 637 including a pulse motor, is screwed into the moving stages 631 and 632, and the feed screws 638 have opposite screw directions with the central portion as a boundary. Therefore, the rotation of the feed screw 638 causes the moving stage 6 to move.
31, 637 move in opposite directions.

A pin 64 is provided on each of the moving stages 631 and 632.
0 and 640 are planted, and these pins are mounted on the moving frame 610 and are microswitches 641 and 642.
Is used to activate the. That is, in FIG. 11, the pin 641 turns on the microswitch 641 and it is detected that the moving stages 631 and 632 are located at the initial position which is the maximum separation state. The feeler motor 637 is rotated to move the moving stage 6
When the distance between 31 and 632 is narrowed, it is detected that the pin 640 actuates the micro switch 642 and the state where the pin 640 is in the minimum separation state, and the rotation of the feeler motor 637 is stopped by this detection signal.

The feeler arm 6 is provided at the front end of the free stage 633.
50 is attached, and the tip end thereof is stretched in parallel with the axis A of the arm 621 of the lens radius sensor 620. A feeler 651 is rotatably supported by a bent portion of a tip end of the feeler arm 650. The contact peripheral edge 651a of the feeler 651 coincides with the ridgeline of the contact wheel 625, that is, the rotation axis O ₁ of the oval piece 624. Similarly, a feeler arm 652 is attached to the front end portion of the free stage 634, and a feeler 653 is rotatably attached to the tip bending portion thereof.

On the central wall 660 of the moving frame 610, the detection heads 661a and 66 of the magnetic encoders 661 and 662, respectively.
2a is attached to the scale 661b, 66
2b are attached to free stages 633 and 634, respectively. Accordingly, the movement amount of the free stage 633, that is, the movement amount of the feelers 651 and 653 can be detected.

A push solenoid 671 is attached to the movable table 603 as shown in FIG. This solenoid 6
Reference numeral 71 denotes a hand arm 623 of the lens radius measuring device 620.
And feelers 651 and 653 are excited when they approach a predetermined radial distance, and act to separate the suspension base 613 to retract the hand arm 623.

Further, the carriage 2 is provided with an opening 680 through which the tip of the lens radius sensor 620 and the feeler of the lens surface shape sensor move in and out of the lens side. At the time of lens grinding processing, grinding water is supplied to the lens measuring device through the opening 680.
A blocking plate 681 is provided to prevent the entry through the through. The shielding plate 681 is attached to a ring 683 rotatably fitted on the lens rotation shaft 28 via an O-ring 682.

To measure the lens radius, etc., set the lens rotation axis 28 to the arrow 6
When rotated in the 84 direction, the ring 683 becomes the O-ring 6
The blocking plate 681 is also rotated by the frictional force of 82 to release the blocking of the opening 680, and when further rotated, the blocking plate 6 is released.
81 abuts on a protrusion 686 formed on the carriage 2 and is prevented from further rotation. After that, only the lens rotation shaft 28 rotates against the frictional force of the O-ring 682,
The lens LE can be rotated. Conversely, during lens grinding, when the lens rotation shaft 28 is rotated in the direction of arrow 685, the blocking plate 681 is simultaneously rotated to block the opening 680 again and abut the projection 687 formed on the carriage 2. Since the subsequent rotation is blocked, the opening 680 continues to be blocked.

Electric Control System Based on FIG. 14, the structure of the electric control system of this embodiment having the above-mentioned mechanical structure will be described with a block diagram. The encoder 615 of the lens radius sensor 620 and the encoders 661 and 662 of the lens surface shape sensor are connected to counter circuits 820, 821 and 823, respectively. The detection output from each encoder is the counter circuit 820, 82.
1, 823, and the result is calculated by the arithmetic control circuit 810.
Is input to. Further, the photo sensor unit 427 and the micro switches 641, 642 and 244 are also connected to the arithmetic control circuit 810.

Feeler motor 637, lens radial sensor motor 6
05, the lens rotation shaft motor 21, the carriage movement motor 60, the contact stop motor 420, and the grinding pressure motor 432 are connected to the motor controller 824. The motor controller 824 is a device that receives a control command from the arithmetic control circuit 810 and outputs how many pulses from the pulse generator 809 to which motor, that is, the number of revolutions of each motor. The grindstone motor 5 is driven by an AC power supply 826, and its rotation / stop control is controlled by a switch circuit 825 controlled by a command from the arithmetic control circuit 810.

The arithmetic control circuit 810 is composed of, for example, a microprocessor, and its control is controlled by a sequence program stored in the program memory 814. Arithmetic control circuit 8
Reference numeral 10 denotes an input device 2000 and a display device 100 described later.
0 is connected. The lens measurement data processed by the calculation control circuit 810 is stored in the lens data memory 8
It is transferred to 27 and stored. The arithmetic control circuit 810 also controls the frame shape measuring device system 800.

Next, the electric system of the frame shape measuring apparatus system 800 will be described with reference to FIG. The driver circuits 801 to 804 are connected to the X-axis motor 206, the Y-axis motor 224, the sensor arm rotary motor 301, and the guide shaft rotary motor 209, respectively. Driver 8
01 to 804 control the rotational drive of each of the pulse motors according to the number of pulses supplied from the pulse generator 809 under the control of the arithmetic control circuit 810.

The reading output of the reading head 313 is the counter 805.
Is counted and input to the comparison circuit 806 and compared with the amount of change in the signal from the reference value generation circuit 807 corresponding to the radius vector change range a. When the count value is within the range a, the count value of the counter 805 and the number of pulses from the pulse generator 809 are converted into radius vector information (ρ _n , θ _n ) by the arithmetic control circuit 810, and the lens frame data memory 811. To be stored here. When the amount of change in the output of the counter 805 is larger than the radius change range a, the arithmetic control circuit 810 receives a signal to that effect and receives the spring device 31 via the driver 808.
The electromagnetic magnet 318 of No. 5 is excited, and the feeler 35
6 is stopped, the supply of the pulse to the driver 804 is stopped, and the rotation of the motor 301 is stopped.

Input Device and Display Device As shown in FIG. 16A, the input device and the display device of this embodiment are composed of sheet switches, and include a main switch 2100, a function key 2200, an input switch group 2303, and System start switch 24
01, 2402 and a stop switch 2 for temporarily stopping the driving
And 500. Where function key 2
Reference numeral 200 denotes a pump switch 2201 for supplying only grinding water; a grindstone switch 2202 for rotating only a grindstone; a handrail switch 2203 for instructing the supply of grinding water for rotation of a grindstone for handrail processing; a lens frame of a frame. Machining type selection switch 2204 for selecting either direct machining that measures the shape and machining based on this or copying that uses a template; automatic manual selection switch 2205; Binocular-one eye selection switch 2206 for selecting whether to measure the lens frame shape for only one eye or the lens frame shape for both eyes; the horizontal positional relationship between the pupil and the frame geometric center A selection switch 2207 for selecting whether to input PD and FPD or a relative amount (shift amount) when inputting; Pressure of the strength selector switch 220
8; and a selection switch 2209 for selecting whether beveling or flat machining is performed during template processing. The input switch group 2303 includes a ten-key input switch 2300, a ten-key input cancel switch 2301 and a memory switch 2302 for storing the input. By the way, the operating state of these switches is determined by the pilot lamp 260 provided for each of them.
Displayed by lighting 0.

As shown in FIG. 14, the display device 1000 includes a controller 1400 and a controller that convert a signal for driving the liquid crystal display 1100 based on the calculation result from the calculation control circuit 810 and the input data from the input device 2000. Signal of dot matrix liquid crystal element X
It is composed of an X driver 1200 for driving rows and a Y driver 1300 for driving Y columns.

Explanation of Operation of Apparatus Next, the operation of the above-described lens grinding apparatus will be described with reference to the flowchart of FIG.

Step 1-1: After turning on the main switch 2100, first, the processing type selection switch 2204 is used to select whether the lens frame of the frame is directly measured and directly processed, or the processing is performed by a template.

Step 1-2: The operator decides whether the bevel position setting is automatic or manual, and if it is automatic, the selection switch 2205 is set to “auto”.
If the side is manual, push the "manual" side.

Step 1-3: The arithmetic control circuit 810 reads the selection command of the selection switch 2204 of the input device 2000 and reads either the direct machining sequence program or the template sequence program from the program memory 814.

1) Direct machining [The operation sequence when direct machining is selected will be described below. ] Step 1-4: The operator measures only the lens frame shape of one eye of the frame,
The binocular-single-eye selection switch 2206 selects whether the other eye is processed by using the inverted data or the lens frame shape of both eyes is measured and processed based on the respective data.

Step 1-5: The worker inputs PD and FP in inputting the horizontal positional relationship between the pupil center of the wearer's eye and the geometric center of the frame.
It is determined whether to input D or a relative amount (approach amount) of both. When inputting PD or FPD, the "PD" side of the selection switch 2207 is pushed, and when inputting the amount of shift, the "shift" side is pushed and inputted.

Step 2-1: Set the frame so that the lens frame 501 of the frame 500 is fixed by the frame holding rod 152 of the frame holding device section 100. The frame holding device section 100 in which the frame 500 is set is inserted from the opening 100 of the device housing 1 and temporarily held by the hands 211 and 212 of the supporting device section 200A.

Step 2-2: The lens frame left / right eye determining device 240 determines whether the lens frame 501 set on the measuring unit 300 of the lens frame shape measuring device is for the left eye or the right eye. That is, the determination device 240
When the micro switch 244 is turned off, the arithmetic control circuit 810 determines that the lens frame located on the measurement unit 300 is for the left eye. On the other hand, the frame holding device section 1
Even if 00 is set on the support device section 200, the determination device 240
When the micro switch 244 of is still ON,
The arithmetic control circuit 810 determines that the lens frame located on the measurement unit is for the right eye.

Step 2-3: The judgment result of the judgment device 240, that is, the right-eye lens frame or the left-eye lens frame is displayed on the liquid crystal display 1100 by the character 1113 as shown in FIG. 16 (B).

Step 2-4: An operator operates the chucking handle 29 to chuck the lens LE to be processed by the lens rotation shaft 28 of the carriage 2. At this time, the suction plate is sucked so that its center coincides with the optical center of the lens LE to be processed.
That is, the optical center of the chucked lens LE to be processed is set so as to coincide with the lens rotation axis.

Step 2-5: The operator inputs the PD value of the wearer according to the prescription with the ten-key switch 2300, and presses the memory switch 2302 after the input is completed. The arithmetic control circuit 810 temporarily stores the data in the internal memory and displays the input data on the “PD” display section 1101 of the display. next,
The operator inputs the FPD value with the numeric keypad switch 2300,
After the input is completed, the memory switch 2302 is pushed. The arithmetic control circuit 810 temporarily stores the data in the internal memory, and the display 11 via the controller 1400.
The input data is displayed on the “FPD” display unit 1102 of 00.

Then, the operator determines the amount of upward displacement U of the optical center of the lens LE.
(See FIG. 9B) is input with the ten-key switch 2300, and after the input is completed, the memory switch 2302 is pressed. As a result, the arithmetic control circuit 810 stores the input data and displays it on the “UP” display section 1103 of the display 1100. However, when "shift" is selected in step 1-5, the relative amount (shift amount) of PD and FPD is input by the ten-key switch.

Step 2-6: The operator judges the material of the lens to be processed, and when it is a glass lens, the switch 2401 below the “G start” 1105 displayed on the liquid crystal display 1100 shown in FIG. If the lens to be processed is a plastic lens, switch 2 under "P Start" 1106
Press 402.

Step 2-7: Memory switch 2 associated with the completion of inputting the amount of displacement in the previous step
The arithmetic control circuit 810 that receives the ON signal of 302 drives the motor 224 of the frame shape measuring apparatus 200 to hold the frame holding device section 100 with the hands 211 and 212, and then drives the motor 209 to move the frame. Set to the measurement position. Then, the motor 301 is rotated and the sensor arm 302 is rotated. The counter 8 outputs the read head 313 of the encoder for each unit rotation angle.
05, the sensor frame rotation angle θ _n and the radius vector measurement value ρn from the counter 805 are used to calculate the lens frame radius vector information (ρ
_n , θ _n ) is obtained. This measurement data is stored in the lens frame data memory 811 as a preliminary measurement value because the rotation center of the sensor arm 302 does not always coincide with the geometric center of the lens frame.

Step 2-8: Lens frame radius vector information (ρ
_n , θ _n ) and the PD data, FPD data and the amount of top-up U input in step 2-2, the optical center position O _s (X _s , Y _s ) is arithmetically controlled according to the above equation (2). The circuit 810 is operated.

Step 2-9: The arithmetic and control circuit 810 causes the drivers 801 and 803 of the frame shape measuring apparatus based on the obtained O _s (X _s , Y _s ).
The Y-axis motor 224 and the X-axis motor 206 are driven via the lens to move the right-eye lens frame of the frame 500 so that the rotation center of the sensor arm 302 coincides with O _s (X _s , Y _s ). .

Step 2-10: The sensor arm 302 is rotated via the driver 804 to measure the radius vector information of the lens frame again, and the output from the reading head 318 of the encoder is counted by the counter 805, and the count value and the motor 301 are set. Both the number of pulses from the pulse generator 809 for rotation is input to the arithmetic and control circuit 810, new radial information ( _rs ρ _n , _rs θ _n ) of the lens frame is obtained from both data, and this is used for the lens. It is stored in the frame data memory 811. This is called the actual measurement of the lens frame.

Step 3-1: The arithmetic control circuit 810 rotates the lens rotation shaft motor 21 via the motor controller 824 to rotate the lens rotation shaft 28 in the direction of arrow 684. With this, the shielding plate 681
Unblock the opening 680 of the. Then, the arithmetic control circuit 81
0 is lens frame data ( _rs ρ _n , _rs θ _n ) based on the main measurement stored in the lens frame data memory 811 (n =
1, 2, 3, ..., N) is the first information ( _rs ρ
₁ , _rs θ ₁ ) is read from the memory 811, and the lens rotation shaft 28 is stopped at that position based on _rs θ ₁ . Further, the pulse number corresponding to the radius vector value _rs ρ ₁ is supplied from the pulse generator 809 to the lens radius sensor motor 605, and the moving frame 610 is moved to the unprocessed lens LE side. As the moving frame 610 moves forward, the lens radius sensor 62
The zero arm 621 also advances due to the tensile force of the constant torque spring 614, and its contact ring 625 abuts against the edge surface of the unprocessed lens LE. The movement position of the arm at this time is detected by the encoder 615 and counted by the counter 820, and the count value is calculated by the arithmetic control circuit 810 as the radius vector (radius) R ₁ of the lens LE on the _rs θ ₁ radius line, It is stored as (R ₁ , _rs θ ₁ ) in the lens data memory 827 (FIG. 18 (B)).

Next, the feeler motor 637 is rotated to move the mover stages 631 and 632.
7, when the pin 640 of the moving stage 632 turns on the micro switch 642, its rotation is stopped via the arithmetic control circuit 810 and the motor controller 824. By the movement of the moving stages 631 and 632, the free stages 633 and 634 connected to them by the springs 635 and 636 slide on the rails 630 and 630. As a result, the feelers 651 and 653 come into contact with the front surface and the rear surface of the lens, respectively, at the position of the radial value _rs ρ ₁ . The positions of the feelers 651 and 653 at this time are the encoder 6
61 and 662 respectively, and counters 821 and 8
22 to the arithmetic control circuit 810 through the count values _f Z ₁ , _b Z ₁
Then, the arithmetic control circuit 810 transfers this to the lens data memory 827 and stores it.

Hereinafter, similarly radius vector _rs theta lens in _N radius _{R N,} feeler position _f Z _N, the _b Z _N determined, all information _(rs theta
_i , R _i , _f Z _i , _b Z _i ) (i = 1, 2, 3, ...,
N) is input to the lens data memory 827 and stored. As a result, the feelers 651 and 653 move the lens frame radius vector information ( _rs ρ _n , as shown in FIG. 18B).
_rs θ _n ) will be traced as a locus T on the unprocessed lens LE.

Step 3-2: The arithmetic control circuit 810 compares the radius R _i of the unprocessed lens LE obtained in step 3-1 with the lens frame radius vector ρ _i at the radius vector angle θ _i . When R _i <ρ _i ,
It is determined that a lens having a desired lens frame shape cannot be obtained even by grinding the lens, a warning is displayed on the display 1100 by the display device 1000, and execution of the subsequent steps is stopped. When R _i ≧ ρ _i , move to the next step.

Step 3-3: The calculation control circuit 810 lens data memory 827 feeler position information stored in the _{(f Z i, b Z i} ) on the basis of, as shown in Fig. 19 (A), 2 Tsunodo Diameter ρ _A , ρ
Each feeler position information _{B (f Z A, b Z} A), (
_f Z _B , _b Z _B ) and the front side radius of curvature of the unprocessed lens, _f ,
Rear curvature radius _b and front curvature center position of unprocessed lens
_{From f} Z ₀ and the back curvature center position _b Z ₀ From _f and _b .

Next, based on _f and _b , the curve value C _f of the front refracting surface of the lens LE is set to the curve value C _b of the rear refracting surface, respectively. (Where n is the lens refractive index) and stored in the memory 827. Also, _f
, _B and the lens frame radius vector information ( _rs ρ _n , _rs θ _n ) from the edge thickness Δn for each unit angle over the entire radius vector angle θ _n. Then, this value is input to and stored in the lens data memory 827.

Step 3-4: The arithmetic control circuit 810 uses the lens frame data memory 811 to obtain the lens frame radius vector information ( _rs ρ _M , _rs θ _M ) having the maximum edge thickness Δ _max and the minimum edge thickness Δ _min , and _rs ρ _N , _rs. Select θ _N ). Next, based on the predetermined bevel shape G of the bevel grindstone 3b, the bevel vertex position of the lens after the bevel processing is set so that the bevel vertex P of the lens comes to the position of front side: rear side = 4: 6 of the edge thickness _e Z _M , _e N _N Ask as. Next, the calculated bevel top position _e
Based on Z _M and _e Z _N , set the bevel curve value C _P to the above-mentioned (4)
The bevel apex position _{e for} each radial angle is calculated from the bevel curve value C _P and the edge thickness Δ _n, which is obtained by the same solution as the equation (7).
Z _i (i = 1, 2, 3, ..., N) is obtained, and these are input and stored in the lens data memory 827.

Step 3-5: The bevel shape at the maximum-minimum edge thickness obtained in step 3-4 is displayed on the liquid crystal display 1100 as an auto-bevel cross-sectional view 1110, as shown in FIG. 16 (B). Here, the solid line shows the bevel shape with the maximum edge Δ _max , and the broken line schematically shows the bevel shape with the minimum edge Δ _{min so} that the respective bevel vertices coincide with each other.

Step 3-6: If "manual" input is made in step 1-2, go to step 3-7. If "auto" input, go to step 4-1.

Step 3-7: When the operator inputs “manual” in the previous step 1-2, the arithmetic control circuit 810 causes the liquid crystal display 1100 of the display device 1000 to display the characters “curve” as shown in FIG. 16 (B). Also, the "approach amount" is displayed, and the operator is prompted to input each desired numerical value. The operator is the numeric keyboard 23
Operate 00 to input the desired curve value. The input data is displayed in the "curve" column of the liquid crystal display 1100, and the operator confirms the input data and then presses the "record" switch 2302.
Press to store the input data in the internal memory of the arithmetic control circuit 810. Next, the operator presses the "close" switch of the switch 2207 and then inputs the desired close amount of the bevel apex obtained in the previous steps 3-5 and 3-6 by operating the ten-key switch 2300 in millimeter units. . The input data is displayed on the “approach” display unit 1112 of the liquid crystal display 1100.
Is displayed in.

Step 3-8: Simultaneously with the above operation, the arithmetic control circuit 810 shifts the bevel apex position of the minimum edge determined in step 3-5 based on the input shift amount by the shift amount, and based on the input bevel curve value. Each radial angle _rs θ _i (i = 1, 2, 3 ...
N), the bevel position information _e N _i is obtained, and
Both the minimum bevel and the maximum bevel position of the bevel are displayed in the manual bevel shape display section of the liquid crystal display 1100.
Graphically displayed on 1120. Here, the solid line shows the maximum bevel shape and the broken line shows the minimum bevel shape. The example of FIG. 16 (B) displays the bevel shape when the bevel apex is moved backward and the bevel curve is small (the radius of curvature is large), as compared with the case of auto.

If the operator sees the bevel shape display and finds that the bevel position is unsatisfactory, he / she inputs the displacement amount and the bevel curve again, and calculates the bevel shape based on the new input.
0 is calculated and displayed on the display device. The finally determined bevel position information _e Z _i is stored in the lens data memory 827.

Step 3-9: The operator displays the bevel shape 1 automatically or manually.
When selecting the automatic bevel by looking at 110 and 1120, the start switch 2401 below that display is turned on. When manual bevel is selected, the start switch 2402 below the display is turned on.

Step 4-1 The arithmetic control circuit 810 determines from which start switch the signal is received in Step 2-6. In the case of a command from the "G start" side selection switch 2401, proceed to the next step 4-2, "P start" side selection switch 240
In the case of the command from 2, the process proceeds to step 4-3.

Step 4-2: The arithmetic control circuit 810 has the maximum radius _rs ρ _max from the lens frame radius vector information ( _rs ρ _n , _rs θ _n ) stored in the lens frame data memory 811 ( _rs ρ _max , _rs θ. _max ) is read. Subsequently, the lens rotation shaft motor 21 is rotated via the motor control circuit 824 to continuously rotate the lens LE.

Next, the arithmetic control circuit 810 turns on the switch circuit 825 to rotate the grindstone motor 5. The arithmetic and control circuit 810 then rotates the contact stop motor 420 based on the radius vector _rs ρ _max , and lowers the horizontal cutting surface 422b of the contact stop member 422 to the height of the distance d _max from the grindstone surface of the rough grindstone 3a.
Here, d _max is the maximum lens frame radius vector _rs ρ _max and the ring 27a.
And the radius r of d _max = _rs ρ _max -r (9).

The carriage 2 is lowered by the lowering of the contact stop member 422, and the lens LE to be processed is ground by the rough whetstone 30. When one of the lens LEs to be processed is ground until the radius vector becomes _rs ρ _max , the ring 27a abuts on the abutting stop member 422 and swings the abutting member 422, and the light blocking rod 429 blocks the optical path of the photo sensor unit 427. (See FIG. 2), the cutoff signal is input to the arithmetic control circuit 810. The arithmetic control circuit 810 continues to count the number of pulses corresponding to one rotation of the lens rotation shafts 28a and 28b, and if the cutoff signal from the photosensor unit 427 is not input during that period,
It is determined that the entire circumference of the lens to be processed has been processed to have a radius of _rs ρ _max .

Subsequently, the arithmetic control circuit 810 causes the lens frame data memory 81
The data of ( _rs ρ ₁ , _rs θ ₁ ) is read from ₁ and _rs θ ₁
The lens rotation shaft motor 21 is rotationally controlled based on the data of 1 to rotate the lens LE to be processed. Next, the contact stopping motor 420 is controlled based on the radius vector data of _rs ρ ₁ , and the contact stopping member 422 is lowered to the height of d ₁ . As shown in FIG. 20, generally, the height d _{i of the} stop member 422 is
Is such that the relation between the radius vector _rs ρ _i and the ring r is obtained from the equation (8), d _i = _rs ρ _i −r (i = 1, 2, 3, ..., N) ... (8) ′ Is required as.

The lens LE to be inspected is further roughly ground by the lowering of the contact stop member 422, and when it is ground to the radius vector of _rs ρ _i , the photo sensor unit 427 inputs the cutoff signal to the arithmetic control circuit 810 again. When the arithmetic control circuit 810 receives the signal, it outputs from the lens frame data memory 811 to ( _rs ρ ₂ , _rs
θ ₂ ) is read as data, the lens LE is rotated to the angle of _rs θ ₂ , and the contact stop member 422 is lowered to the height d ₂ based on _rs ρ ₂ to grind the lens LE. Less than,
Similarly, the lens LE to be processed is ground into the shape of the lens frame data ( _rs ρ _i , _rs θ _i ) by grinding the lens LE to ( _rs ρ _N , _rs θ _N ).

Step 4-3: The lens is moved by the carriage moving motor 60 to position it on the plastic rough grindstone, and rough grinding is performed in the same manner as in step 4-2.

Step 4-4: The arithmetic and control circuit 810 controls the contact stop motor 420 via the motor controller 824 to raise the carriage 2 to disengage the roughened grinding processing lens LE from the rough whetstone 3a, and then the carriage movement motor 60. Is controlled to position the lens LE on the bevel grindstone 3b.

Next, the arithmetic control circuit 810 uses the lens frame data memory 81.
1 to the lens frame radius vector information ( _rs ρ _i , _rs θ _i ) (i = 1,
2, 3 ... N) are sequentially read, and corresponding bevel position information _e Z _i is sequentially read from the lens data memory 827. Based on these data, the lens rotation axis motor 21, the stopper motor 420, By controlling the carriage movement motor 60, the rough-ground lens is beveled by the bevel grindstone 3b.

Step 4-5: After the beveling is finished, the arithmetic control circuit 810 controls the contact stop motor 420 to return the carriage 2 to the fixed position on the bevel grindstone, turns off the switch 825, and stops the grindstone motor 5.

Next, the arithmetic control circuit 810 controls the lens rotation shaft motor 21 to rotate the lens rotation shaft 28 in the direction of arrow 684 in FIG. As a result, the light blocking plate 681 rotates and the opening 680 is opened. 21 (A) and 21 (B)
As shown in, the arithmetic and control circuit 810 rotates the lens radius sensor motor 605 to move the moving frame 610 forward. Along with this, the lens radius sensor 620 is advanced by the tensile force of the constant torque spring 614, and the contact ring 625 abuts on the edge of the beveled lens LE. Since the lens rotation shaft 28 is rotated, the encoder 615 causes the radial information ( _rs ρ _i ′, _rs θ _i ′) of the lens LE to be transmitted (i = 1, 2,
3, ..., N), the amount of movement is detected, and this is measured by the arithmetic control circuit 810 via the counter 820.

Step 4-6: The arithmetic control circuit 810 uses the lens frame radius vector information ( _rs ρ _i , _rs θ _i ) stored in the lens frame data memory 827 and the lens radius vector of the processed lens measured in the previous step 4-5. The information ( _rs ρ _i ′, _rs θ _i ′) is compared to determine whether the two match. If both match, go to step 4-8,
If they do not match, the process proceeds to step 4-7.

Step 4-7: When _rs ρ _i ′ is larger than _rs ρ _i , the height d _i of the abutting member 422 is lowered by a small amount and the process returns to step 4-4 to perform beveling.

Step 4-8: If it is determined in step 4-6 that _rs ρ _i and _rs ρ _i ′ match, the state is returned to the initial state. After that, remove the lens that has been processed from the carriage.

Step 6-1: The arithmetic and control circuit 810 determines whether or not the grinding processing has been completed for the binocular lenses, and if not completed, the operation proceeds to step 5-2. When it is determined to be completed, all steps are completed.

Step 6-2 and Step 6-4 The arithmetic control circuit 810 determines whether the binocular measurement or the monocular measurement is selected in Step 1-4, and determines “one eye”.
If is selected, the process proceeds to the next step 6-3.
When "Binocular" is selected, "Set other eye lens frame of frame" is displayed on the liquid crystal display 1100 of the display device 1000, and the operator sets the other eye lens frame 501. . The above-mentioned step 2-
After performing steps 2 to 2-4, the process proceeds to step 2-7.

Step 6-3: When step 1-4 is the one-eye measurement command, the arithmetic control circuit 8
In step 10, the right eye lens frame measurement data ( _rs ρ _n , _rs θ _n ) obtained in step 2-6 is converted from polar coordinates to Cartesian coordinates, and then the Cartesian coordinates data ( _rs X _i , _rs Y _i ) (i = 1,
2, 3, ..., N) As a new lens frame shape data (1 _s X _i , 1 _s Y _i )
Ask for. This data is obtained by reversing the lens frame shape of the right eye with the Y _s axis of the X _s -Y _s coordinate having the optical center O _s ′ as the origin as the symmetrical axis, as shown in FIG. 9 (C). Is subjected to the orthogonal coordinate-polar coordinate conversion again (l _s ρ _n , l _s θ _n ) as the lens frame shape of the left eye, and the lens frame data memory 811
Memorize to.

After executing steps 2-4 and 2-6 below, step 3-1
Move to.

2) In the case of template processing When it is determined in step 1-2 that template processing has been selected, grinding processing is executed according to the following steps.

Step 5-1: Attach the template SP on which the frame 500 is pre-molded to the template holder 27b of the carriage 2 (see FIG. 22) Step 5-2: Mount the lens LE to be processed on the lens rotation shaft 28 of the carriage 2. To chuck.

Step 5-3: The operator judges the material of the lens to be processed, and if it is glass, it is indicated by "G start", and if it is plastic, it is indicated by "P start". Push. If the switch 2401 is turned on, the process proceeds to step 5-4, and if the switch 2402 is turned on, the process proceeds to step 5-5.

Step 5-4: The arithmetic and control circuit 810 turns on the switch 825 to rotate the grindstone motor 5 to rotate the grindstone 3 at high speed. Next, the arithmetic control circuit 810 rotates the lens rotation shaft motor 21 to rotate the lens LE at a low speed. Further, the stopper motor 420 lowers the arc-shaped portion 422a of the stopper member 422 to the same height as the glass rough grinding stone 3a under the control of the arithmetic control circuit 810. As a result, the rough grinding of the lens LE is started. When the cutoff signal from the photo sensor 427 is continuously output for one rotation of the lens rotation shaft 28, the arithmetic control circuit 810 determines that the rough grinding is completed, and controls the stopper motor 420 to fix the carriage 2. After raising to the position, the switch 825 is turned off and the grindstone 3 is stopped.

Step 5-5: The lens LE to be processed is positioned on the plastic rough grindstone 3C by driving the carriage moving motor 60, and thereafter, rough grinding is performed in the same manner as in Step 5-4 described above.

Step 5-6: The operator uses the selection switch 2209 to input whether the lens after the rough grinding is beveled or smoothed.

Step 5-7: If beveling is selected in step 5-6, the process proceeds to the next step 5-8, and if smoothing is selected, the process proceeds to step 7-1.

Step 5-8: The arithmetic control circuit 810 rotates the lens rotation shaft 28 by rotating the motor 21 to open the opening 680, and as shown in FIGS. 23 (A) and 23 (B), the lens radius sensor. The motor 605 is controlled to move the moving frame forward, and the pulling force of the constant torque spring 614 brings the contact ring 625 into contact with the edge of the rough-ground lens LE. Encoder 6
Reference numeral 15 denotes a machining radius _i of the lens LE (i = 1, 2, 3,
, N) is measured and the data is input to the arithmetic control circuit 810 via the counter 830. Arithmetic control circuit 810
Is also reduced by a predetermined amount α to the radial measurement value _i ( _i −
The motor 605 is controlled so that the fillers 651 and 653 are located at the position α), and the motor 637 is controlled to set the free stages 633 and 634 in a free state, and the feelers 651 and 653 are used to position the front surface of the rough-ground lens LE. _{f i} and the rear surface position _{b i} are set to encoders 661 and 66.
Measure at 2.

After that, the above steps 3-3 to 3-9 and 4-4 are executed to finish the machining.

Step 7-1: When the operator selects smoothing in step 5-6, the arithmetic control circuit 810 reads the fact in step 5-7, and the carriage moving motor 60 is rotated to move the lens LE to be processed. It moves to the smooth grindstone 3d, and then the carriage 2 is lowered to perform the flat machining.

Automatic detection device for template processing In the above-mentioned embodiment, selection between direct machining and template processing is made by the command of the selection switch 2204.
FIGS. 0 (A) and (B) show an example in which the selection can be automatically instructed by mounting the template.

A bearing 710 is attached to the arm 34 of the carriage. The bearing 710 has a slot 711 along its length.
Are formed. A stopper lever 712 is fixed to one end of the bearing 710, and a shaft 714 having a tapered portion 713 formed at the other end is rotatably fitted and inserted. Axis 714
A pin 715 is planted on the outer periphery of the. This pin 71
Reference numeral 5 is normally in contact with the end surface of the bearing to prevent the shaft 714 from moving in the axial direction. The end of the shaft 714 is further provided with a shaft 714.
A spring 718 that constantly pulls in the direction of the arrow 716 in FIG. This spring 718 is the arrow 716
The shaft 714 is twisted in the direction of
A rotating force is applied in the direction opposite to 17. The contact portion 72 of the microswitch 720 is attached to the taper portion 713.
0a is abutted. The micro switch 720 is connected to the arithmetic control circuit 810.

As shown in FIG. 10 (B), the stopper lever 712 is formed with a cutout portion 712a, and when the lever 712 is rotated, a pin for holding the template SP that is planted at the end of the lens rotation shaft 28 is provided. The central pin 28a of the above is covered from above and works to prevent the template SP from coming off.

Next, the operation of this embodiment will be described. When processing the template, the operator attaches the template SP to the template holding pin of the lens rotation shaft 28 of the carriage 2. Next, the stopper lever 71
2 is rotated clockwise in FIG. 10 (B) until the notch 712a abuts the central pin 28a. When the pin 715 comes to the position of the slot 711, the spring 71
A pulling force of 8 causes shaft 714 to move in the direction of arrow 716. By the movement of the shaft 714, the micro switch 720 is turned on by the taper portion 713, and the arithmetic control circuit 810 can automatically receive the command for the template processing.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a mechanical portion of a lens grinding device according to the present invention with one end cut away, FIG. 2 is a sectional view taken along line II-II ′ of FIG. 1, and FIG. 3 is an external perspective view of a frame shape measuring device. FIG. 4 (A) is a perspective view of the frame holding device section, FIGS. 4 (B) and 4 (C) are explanatory views showing the operation thereof, and FIG. 5 is a vertical midline sectional view of the frame holding device section. FIG. 6 is a vertical median cross-sectional view showing the structure of the spring member, FIG. 7 (A) is a schematic view showing the relationship between the supporting device part and the sensor part, FIG. 7 (B) is its cross-sectional view, and FIG. 8 is the sensor. FIG. 9 (A) is a schematic view showing the relationship between the geometrical center and the optical center of the measured value of the lens frame, and FIG. 9 (B) is the relationship between the frames PD and PD. FIG. 9 (C) is a schematic diagram showing the relationship between right-eye lens frame data and left-eye lens frame data, FIG. 10 (A), ( B) is a diagram showing an automatic detection device for template processing, FIG. 11 is a plan view of a lens measuring device, and FIG.
11 is a sectional view taken along the line XII-XII 'in FIG. 11, FIGS. 13 (A) to 13 (C) are views showing the structure and operation of the tip of the lens radius sensor section, and FIG. 14 is a block showing an electric system of the present invention. FIG. 15 is a block diagram showing an electric system of the frame shape measuring device, FIG. 16 (A) is a diagram showing a display device and an input device, and FIG. 16 (B) is another display example of the display device. Fig. 17
FIG. 18 is a flow chart showing the operation sequence of the present invention, FIG. 18 (A), (B), FIG. 21 (A), (B), second.
3 (A) and 3 (B) are schematic diagrams showing the operation of the lens measuring device, FIGS. 19 (A) and 19 (B) are schematic diagrams showing the relationship between the lens curve and the edge thickness, FIG. 20 and FIG. FIG. 22 is a diagram showing the relationship between the carriage and the stopper member. 1 ... Device housing, 2 ... Carriage, 3 ... Grindstone, 28
a, 28b ... Lens rotation axis, 200 ... Frame shape measuring device, 300 ... Measuring unit, 601 ... Base frame, 603 ... Moving base, 610 ... Moving frame, 620
...... Lens radius sensor, 623 ...... Hand arm, 6
24 ... Oval piece, 625 ... Contact ring, 631, 632
…… Movement stage, 651, 653 …… Feeler, 810
…… Arithmetic control circuit.

Front page continuation (72) Inventor Yoshiyuki Hatano 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Within Tokyo Optical Machinery Co., Ltd. (72) Inventor Hiroaki Ogushi 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Tokyo Optical Equipment Co., Ltd. In the company

Claims (3)

[Claims] 1. A lens rotation shaft for sandwiching an unprocessed lens to rotatably support the lens, and a front refracting surface and a rear refracting surface of the lens to be contacted so that the lens to be processed is a frame. Measurement of the lens to be processed having a predetermined relationship with the virtual edge locus obtained from the shape data of the lens frame of the spectacle frame to be inserted or the shape data of the lens to be processed which is profile-processed by the template having the shape of the lens frame A feeler portion arranged on a locus, a moving means for moving the feeler portion so as to separate from the measurement locus of the lens to be processed, and the feeler portion based on detection information in the lens rotation axis direction by the feeler portion. A lens shape measuring device, comprising: a control unit for determining an edge thickness that will be formed after the beveling of the processed lens. 2. The lens shape measuring device according to claim 1, wherein the measurement locus is formed congruently with a virtual edge locus. 3. A bevel apex after being beveled by contacting a lens rotation shaft for sandwiching an unprocessed lens and rotatably supporting the lens and a front refracting surface and a rear refracting surface of the lens to be processed. And a virtual edge locus obtained from the shape data of the lens frame of the spectacle frame in which the lens to be processed is placed or the shape data of the lens to be processed by the template having the shape of the lens frame. A feeler portion disposed on the measurement locus of the lens to be processed and having a bevel apex after beveling, which has a correlation with a moving unit that moves the feeler portion away from the measurement locus of the lens to be processed, The edge thickness that will be formed after the beveling of the lens to be processed is obtained based on the information detected by the feeler unit in the lens rotation axis direction, and Ra unit lens shape measuring apparatus characterized by a control means for determining the processing radius vector length of the uncut lens based on the lens radius vector information after beveling by.