JPH0123721B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention has a frame shape measuring means for measuring the shape of a lens frame of an eyeglass frame, and grinds a fabric eyeglass lens based on the measurement data of the measuring means. The present invention relates to an improvement of the feeler shape of a lens grinding device, particularly a frame shape measuring device.

(Prior art and its problems) In order to insert lenses into eyeglass frames, there has been a template-based lens grinding device that grinds fabric eyeglass lenses based on a template that is processed to follow the shape of the lens frame. It has been put into practical use since then.

On the other hand, in order to eliminate the trouble of producing a template in the lens grinding device, the applicant directly digitally measures the radius of the lens frame of an eyeglass frame, and grinds the fabric eyeglass lens based on the measured value. In Japanese Patent Application No. 58-225197, we have proposed a so-called direct-grinding lens grinding device. Normally, a raw eyeglass lens is processed by a lens grinding device using a rough grindstone based on the lens frame shape of the frame, and then beveled using a V-groove (bevel) grindstone. The bevel angle (inclination angle) of the bevel grinding wheel is formed to a predetermined value, for example, 120°.

On the other hand, the bevel angle of the rim of the lens frame of an eyeglass frame varies to some extent depending on the frame manufacturer or depending on the material or type of frame, and the bevel angle and the rim bevel angle of the frame do not necessarily match. If the bevel angle of the rim is smaller than the bevel angle of the grinding wheel, the beveled lens will not be completely inserted into the bevel groove of the frame, and the beveled apex of the lens and the bevel bottom of the rim bevel groove will be separated from each other. It will be inserted into. That is,
In this way, a frame with a groove in which the bevel angle of the rim groove is small and the bevel angle of the bevel grinding wheel is small cannot be fitted into the frame unless the lens frame is machined into a shape smaller than the shape of the lens frame (its radius vector is shorter).

On the other hand, when measuring the shape of a lens frame by tracing a straight line using a frame shape measuring device, if the shape is measured by making the feeler into a needle and abutting it against the bevel bottom of the rim groove of the lens frame, the shape data will include the lens frame. Even if the true shape of the rim groove can be measured, if the bevel angle of the rim groove is smaller than the bevel angle of the grinding wheel, the lens processed using the measured shape data may actually be too large to fit into the frame and may require correction processing. It means that there is a drawback that requires it.

The present invention has been made in view of the current situation, and even if the bevel angle of the rim groove of the lens frame of the frame is smaller than the bevel angle of the bevel grinding wheel of the lens grinding device, it is possible to fit the frame into such a lens frame. It is an object of the present invention to provide a frame shape measuring device capable of measuring the shape of a lens frame so that a lens having a size suitable for processing can be processed.

(Means for Solving the Problem) The eyeglass frame shape measuring device of the present invention includes a carriage having a lens rotation shaft for holding a lens to be processed, and a carriage that rotates at high speed to grind and bevel the lens to be processed. a grindstone; a carriage moving means for changing the inter-axis distance between the lens rotation axis and the rotation axis of the grindstone; and means for controlling the amount of rotation of the lens rotation axis based on lens frame shape data of an eyeglass frame. An eyeglass frame shape measuring device for inputting shape data of the lens frame into a lens grinding device, the device having a means for controlling the amount of movement of the carriage by the carriage moving means, and a frame holding means for holding the eyeglass frame. a bevel-shaped feeler that can come into contact with the bevel groove of the lens frame and has an inclination angle approximately equal to the inclination angle of the bevel of the grinding wheel of the lens grinding device; and a measuring means for measuring the amount of movement of the feeler. It is characterized by including the following.

(Effects of the Invention) Since the feeler of the frame shape measuring device of the present invention has an inclination angle that is approximately equal to the inclination angle (bevel angle) of the bevel grinding wheel of the lens grinding device, bevel processing is performed using the bevel grinding wheel. When the lens is placed in the lens rim of the frame,
It matches and engages the rim of the lens frame. Therefore, by using the device of the present invention, the frame shape measuring device accurately measures the shape of the lens frame created by the locus of the corresponding contact point, and processes the lens frame based on this measured value, thereby eliminating troublesome correction and reprocessing work. No longer needed.

(Example) Overall configuration of apparatus FIG. 1 is a partially cutaway perspective view showing the overall configuration of a lens grinding apparatus according to the present invention. Housing 1
A frame shape measuring device 200, which will be described later, is built into the lower front part of the frame shape measuring device 200, which will be described later. An opening 10 for inserting and removing the frame holder is formed in the front wall of the casing 1, and a keyboard 1000 and a display device 2000, which will be described later, are arranged vertically in the upper right of the front wall of the casing 1. ing.
A vertically swinging door 10a is attached below the opening 10.

In the whetstone chamber 30 of the housing 1, there are a rough whetstone 3a for glass lenses and a rough whetstone 3 for plastic lenses.
A grindstone 3 is fixed to the rotating shaft 31. The grindstone 3 includes a bevel grindstone 3b, and a flat precision grindstone 3d. The rotating shaft 31 is rotatably supported on the wall surface of the grindstone chamber 30, and a pulley 53 is attached to the end thereof. The pulley 53 connects to the AC via the belt 52.
It is connected to a pulley 51 attached to the rotating shaft of a grindstone rotating motor 5 consisting of a drive motor. With this configuration, when the motor 5 rotates, the grinding wheel 3
is rotated.

A shaft 11 is supported on a bearing 12 of the housing 1 so as to be slidable in the axial direction.
Rear arms 33a and 33b of the carriage 2 are rotatably supported on the rear arms 33a and 33b of the carriage 2. The front arms 34a, 34b of the carriage 2 have lens rotation shafts 28a,
28b is coaxially and rotatably supported.
The lens rotation shaft 28a on the right side in FIG. 1 has a lens chucking mechanism having a known configuration, and moves forward and backward in the axial direction by rotation of the chuck handle 29, and moves the lens LE to be processed along the rotation shaft 28a,
It can be held between 28b.

On the other hand, at the outer end of the left lens rotation shaft 28b, there is a disc 27a that comes into contact with an abutting device 42, which will be described later.
and a template holding part 27b for holding the template.

Each of the lens rotation axes 28a and 28b has a
Pulleys 26a and 26b are attached, and a drive shaft 25 having pulleys 23a and 23b at both ends is built into the carriage 2. A worm wheel 22 is attached to one end of the drive shaft 25, and a worm gear 21 is attached to the rotating shaft of a lens shaft rotating motor 21 consisting of a pulse motor.
It meshes with a. A timing belt 2 is installed between the pulleys 23a and 23b and the pulleys 26a and 26b.
4a and 24b are spanned. With these configurations, the rotation of the motor 21 is caused by the lens rotation axis 28a,
28b, and rotates the lens LE to be processed. On the other hand, the carriage 2 has a built-in lens measuring device 600, which will be described later.

The end of the shaft 11 is fitted into the arm 40 of the frame 4 for moving the carriage. 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 the rotating shaft of a carriage moving motor 60 consisting of a pulse motor. With this configuration, when the motor 60 rotates, the frame 4 is moved in the left-right direction, and the carriage 2 is moved in the left-right direction via the shaft 11. A stopper device 42 and a grinding pressure control device 43, which will be described later, are also attached to the frame 4.
A pin 43 a implanted in the carriage 2 is brought into contact with the grinding force control device 43 .

Figure 2 shows -' of frame 4 in Figure 1.
This is a cross section. The abutting device 42 is attached to the frame 4
It is generally composed of a stopper up/down motor 420 made of a pulse motor disposed on the lower surface of the holder, a main pillar 421, and a stopper member 422. motor 42
A feed screw 423 attached to the rotating shaft of 0 is threadedly engaged with a male threaded portion 424 of the support column 421. Also,
A key 425 is embedded in the side surface of the support column 421, and the key 425 is fitted into a key groove 44 formed in the frame 4.

A photosensor unit 427 is attached to the table section 426 at the upper end of the support column 421.
The abutting member 422 is connected to the shaft 428 by a shaft 428 that is rotatably fitted into the end of the table portion 426.
The table portion 426 can be rotated freely around 8 as the center of rotation.
installed on. A spring 470 is interposed between the abutting member 422 and the table portion 426, and the action of this spring 470 causes the abutting member 42 to
2 is always lifted upward as shown by the two-dot chain line.

A light shielding rod 429 is provided inside the abutting member 422.
is attached, and when the abutting member 422 is pressed down, it is located between the photosensor units 427 and acts to block the light running inside the units 427. Further, an eccentric cam 471 is attached inside the abutting member 422, and by rotating this, the distance between the cam surface and the table portion can be changed, and the stopping position of the abutting member 422 can be finely adjusted. An arcuate portion 422a having the same curvature as the rough grindstone 3a and a horizontal cut surface 422b are formed on the upper surface of the abutting member 422.

During cutting using a template, the template SP attached to the carriage 2 comes into contact with this arcuate portion 422a. Further, the horizontal cutting 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 this embodiment, the detection of the template is performed using the stopper member 4 as described above.
Although the detection is performed by abutting the template against 22, the present invention is not limited to this. For example, a method may be used in which the movement of the template, that is, the progress of lens processing, is checked based on the presence or absence of edges of the template between the photosensor units.

The grinding pressure control device 43 includes a pulse motor 432 having a feed screw 431, a piston 434 that is threadedly engaged with the feed screw 431 through a female threaded portion 433, and a cylinder 435 that is slidably inserted on the outer wall of the piston 434. and a spring 436 disposed between the cylinder 435 and the piston 434.
A key 437 is implanted on the outside of the flange of the piston 434, and this key 437 is fitted into a key groove 45 formed in the frame 4. The upper surface 435a of the cylinder 435 comes into contact with the side surface of a pin 43a attached to the carriage 2, and supports the weight of the carriage 2 by the elastic force of the spring 436. By moving the piston 434 up and down via the feed screw 433 due to the rotation of the motor 432, the amount of compression of the spring 436 changes, and the amount of force supporting the carriage 2 changes. A lens frame shape measuring device that can change the pressure.

Lens Frame Shape Measuring Apparatus Next, the configuration of the lens frame shape measuring apparatus 200 will be explained based on FIGS. 3 to 10. FIG. 3 is a perspective view showing a lens frame shape measuring device according to the present invention. This device consists of three main parts: a frame holding device section 100 that holds the frame;
and a support device section 200A that supports this frame holding device section 100 and controls the transfer of this holding device section into the measurement plane and its movement within the measurement plane.
and a measurement unit 300 that digitally measures the shape of the lens frame or template of the eyeglass frame.

The support device section 200A has a housing 201. The housing 201 has legs 253, 254, which are slidably mounted on rails 251, 252 attached to the housing 1 of the lens grinding device. Also, the door 10a has a rail 25.
5,256, and when the door 10a is opened, the rails 255, 256 are connected to the rails 251, 256, respectively.
252. With this configuration, the operator can install the housing 20 as necessary.
1 can be slid out of the device housing 1.

The housing 201 also has guide rails 202a and 202b installed in parallel in the vertical direction (X-axis direction of the measurement coordinate system) on the housing 201, on which the movable stage 203 can freely slide. It is placed. A female screw portion 204 is formed on the lower surface of the moving stage 203, and an X-axis feed screw 205 is screwed into the female screw portion 204. This X-axis feed screw 205 is rotated by an X-axis motor 206 consisting of a pulse motor.

Both side flanges 207a of the moving stage 203,
A guide shaft 208 is passed between 207b and parallel to the Y-axis direction of the measurement coordinate system.
8 is configured to be rotated by a guide shaft motor 209 attached to the flange 207a. The guide shaft 208 has a guide groove 210 formed on its outer surface parallel to the shaft. Hands 211 and 212 are slidably supported on the guide shaft 208. The shaft holes 213 and 214 of the hands 211 and 212 have protrusions 213a and 2, respectively.
14a is formed, and these projections 213a,
214a is the guide groove 21 of the guide shaft 208 mentioned above.
0 and prevents the hands 211 and 212 from rotating around the guide shaft 208.

The hand 211 has two slopes 21 that intersect with each other.
5, 216, and the other hand 212 also has two slopes 214, 218 that intersect with each other. The ridgeline 220 created by both slopes 217 and 218 of the hand 212 is the slope 215 and 216 of the hand 211.
The slopes 217 and 218 are configured to be parallel to and in the same plane, and the angles formed by the slopes 217 and 218 are equal to the angles formed by the slopes 215 and 216. And both hands 211,2
12, a spring 230 is stretched between them as shown in FIG. 7B. Moreover, notches 215a and 217a are formed in the slopes 215 and 217, respectively.

Further, an arm 241 having a contact ring 242 at one end is attached to the hand 212 so as to be rotatable about the other end. This arm 241 is normally brought into contact with a micro switch 244 by a spring 243. These contact ring 242, arm 241, spring 243, and micro switch 244 constitute a left/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, and a Y-axis motor 224 consisting of a pulse motor having a pulley 233 is attached to the other end of the rear flange 221. Mini cheer belt 2 with springs 225 interposed between pulleys 223 and 224
26 is stretched across, mini cheer belt 226
Both ends of the pin 2 are planted on the upper surface of the hand 211.
It is fixed to 27. On the other hand, a collar 228 is formed on the upper surface of the hand 212.
8, the moving stage 20 is moved by the movement of the hand 212.
The pin 229 implanted in the rear flange 221 of 3
It is configured to come into contact with the side of the

The measurement unit 300 includes a sensor arm rotation motor 301 made of a pulse motor attached to the bottom surface of the housing 201, and a sensor arm part 302 rotatably supported on the top surface of the housing 201. A belt 305 is stretched between a pulley 303 attached to the rotating shaft of the motor 301 and a rotating shaft 304 of the sensor arm section, so that the rotation of the motor 301 is transmitted to the sensor arm section 302.

The sensor arm section 302 has two rails 311, 311 extending above its base 310, and a sensor head section 312 is slidably mounted on these rails 311, 311. A magnetic scale reading head 313 is attached to one side of the sensor head section 312, and is configured to read a magnetic scale 314 attached to the base 310 parallel to the rail 311 and detect the amount of movement of the sensor head section 312. has been done. In addition, on the other side of the sensor head section 312,
One end of a constant torque spring 316 of a spring device 315 that constantly pulls the head portion 312 toward the side surface of the arm end is fixed.

FIG. 6 shows the configuration of this spring device 315. An electromagnetic magnet 318 is provided in a casing 317 attached to a base 310 of the sensor arm section 302, and a slide shaft 319 is fitted into a shaft hole of the magnet 318 so as to be slidable in the axial direction thereof. This slide shaft 319 is
It has flanges 320 and 321, and a spring 323 is interposed between the flanges 320 and the wall of the casing 317.
3, the slide shaft 319 is normally 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. Further, a spring 326 having a slide shaft 319 inserted therebetween is interposed between the two clutch plates 324 and 325, and the gap between the clutch plates 324 and 325 is constantly widened to prevent contact between the constant torque spring 316 and the clutch plate 325. . Furthermore, a washer 327 is attached to the end of the slide shaft 319.

FIG. 8 shows the configuration of the sensor head section 312, in which a slider 350 supported by the rail 311
A shaft hole 351 is formed in the vertical direction, and a sensor shaft 352 is inserted into this shaft hole 351. A ball bearing 3 held by the sensor shaft 352 is located between the sensor shaft 352 and the shaft hole 351.
53 is interposed, thereby smoothing the rotation of the sensor shaft 352 around the vertical axis and the movement in the vertical axis direction.

Further, an arm 35 is provided at the center of the sensor shaft 352.
5 is attached, and on the upper part of this arm 355, a bevel feeler 356 in the form of a bead having an inclination equal to the bevel inclination angle of the bevel grinding wheel 3b that comes into contact with the bevel groove of the lens frame is rotatably supported. ing. The circumferential point of the bevel wheel 356 is located on the center line of the vertical sensor shaft 352.

Next, the configuration of the frame holding device section 100 will be explained based on FIG. 4A and FIG. 5. Fixed base 15
A frame holding rod 15 is installed in the center of both side flanges 151, 151 having sides 151a, 151a of 0.
2,152 are screwed. In addition, the flanges 151, 151 have an inverted U-shaped bridge 151.
b, 151c are fixed. This bridge 1
51b and 151c hold the holding device 100 in the hand 21.
When inserting between 1 and 212, if the direction is not the normal direction, the hand notch 215a, 217
A is provided to abut against the shoulder of the holding device and prevent the insertion of the holding device. Bottom plate 1 of fixed base 150
50a and the flange 151 have sides 153a, 1
53a is inserted, and the movable base 153 has two leaf springs 154, 1 attached to the bottom plate 150a of the fixed base 150.
54.

The movable base 153 has two parallel guide grooves 1.
55,155 are formed, as shown in FIG.
Slider 15 is inserted into these guide grooves 155, 155.
The projecting legs 156a, 156a of 6,156 are engaged, and the sliders 156, 156 are moved to the movable base 15.
It is slidably mounted on 3. On the other hand, a circular opening 157 is formed in the center of the movable base 153, and a ring 158 is rotatably fitted around the outer periphery of the circular opening 157. Two pins 159, 159 are implanted on the upper surface of this ring 158.
9,159 are sliders 156, 15 respectively
It is inserted into the slot 156c formed in the stepped portions 156b, 156b of No.6.

Further, vertical notches 156d, 156d are formed in the centers of the sliders 156, 156, and the frame holding rods 152, 152 described above can be inserted into the notches 156d, 156d, respectively. Further, on the top surface of the sliders 156, 156, holes 156e, 156 are provided for easy operation by inserting a finger of the operator when operating the slider.
e is formed.

Next, the operation of the frame shape measuring device described above will be explained based on FIGS. 4B and 4C and FIGS. 7A and 7B.
First, as shown in FIG. 4B, slider 15
Insert your fingers into the holes 156e, 156e of the sliders 156, 156, sufficiently open the distance between the sliders 156, 156, and press downward, so that the movable base 153 and the elastic force of the leaf springs 154, 154 In contrast, the holding rod 152 and the stepped portions 156b, 156b of the sliders 156, 156 are sufficiently spaced apart. After that, insert the lens frame 501 of the eyeglass frame 500 that you want to measure within this interval, and
The upper and lower rims of 01 are sliders 156,
Slider 15 so as to come into contact with the inner wall of 156
6,156 narrower spacing. In this embodiment, since the sliders 156, 156 have a connection structure using the ring 158 as described above,
The amount of movement of one of the sliders 156, 156 directly gives the same amount of movement to the other slider.

Next, after sliding the frame 500 so that the approximate center of the upper rim of the lens frame 501 is below the holding rod 152, when the operator releases the sliders 156, 156, as shown in FIG. , the movable base 153 rises due to the elastic force of the plate springs 154, 154, and the lens frame 501 moves to the stepped portion 156b,
156b and the holding rods 152, 152, and the frame 500 is held so that the approximate geometric center point of the lens frame 501 and the center point 157a of the circular opening 157 of the frame holding device 100 substantially coincide with each other. Further, at this time, the distance d from the apex 501a of the bevel groove of the lens frame 501 to the side 151a of the flange 151 of the fixed base 150 and the distance d from the side 153a of the movable base 153 are configured to take equal values.

Next, the frame holding device section 100 holding the frame 500 in this manner is inserted between the hands 211 and 212 of the support device 200, which are set at a predetermined interval, as shown in FIG. 7A. At the same time, the left and right eye determination device 240 uses its contact ring 242
When the frame 500 makes contact with the arm 241 and the arm 241 is rotated, the contact point of the micro switch 244 is
It becomes OFF. Thereby, the determination device 240 automatically determines that the lens frame 501 to be measured is for the left eye. Next, the Y-axis motor 224 is rotated by a predetermined angle. The mini-cheer 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 collar 228 is disengaged from the pin 229. At the same time, the frame holding device section 100 holds both hands 21 by tension springs 230.
1,212. At this time, the flange 1 of the fixed base 150 of the frame holding device section 100
The sides 151a and 152a of 51 are hand 2, respectively.
11 and the slope 217 of the hand 212, and both sides 153a of the movable base 153,
153a are brought into contact with the slope 216 of the hand 211 and the slope 218 of the hand 212, respectively.

In this embodiment, as described above, from the apex 501a of the bevel groove of the glasses frame 501 to the side 151a
Since the distances d to the sides 153a and 153a are equal to each other, the frame holding device 100
1,212, the bevel groove apex 501a of the lens frame 501 aligns with the ridgeline 219,2 of both hands.
20 is automatically positioned on the reference plane S created by the reference plane S.

Next, by rotating the guide shaft rotation motor 209 at a predetermined angle, the frame holding device section 100 is rotated as shown in FIG. 7A.
The reference plane S is stopped at the same plane as the initial position of the bevel feeler 356 of the measurement unit 300.

Next, the hand 211 holding the frame holding device section 100 by further rotating the Y-axis motor 224,
212 is moved by a certain amount in the Y-axis direction, and the circular opening center point 159a of the frame holding device section 100 and the center of the rotation axis 304 of the measuring section 300 are approximately aligned. At this time, during the move, the bevel wheel 35
6 makes contact with the bevel groove of the lens frame 501. The initial position of the bevel feeler 356 is shown in Fig. 7 A and B.
As shown in FIG. 2, a pin 352a implanted at the lower end of the sensor shaft 352 comes into contact with a hanger 310a attached to the base 310 of the sensor arm section, so that its direction is regulated. Thereby, when the eyeglass frame 500 moves due to the rotation of the Y-axis motor 224, the feeler 356 can always enter the bevel groove.

Subsequently, the motor 301 is rotated every predetermined number of unit rotation pulses. At this time, the sensor head portion 312 moves along the rail 31 according to the shape of the glasses frame 500, that is, the radius vector of the lens frame 501.
1,311, and the amount of movement is read by a magnetic scale 314 and a reading head 313.

Rotation angle θ of motor 301 and reading head 31
From the reading amount ρ from 3, the lens frame shape is measured as (ρ _o , θ _o ) (n=1, 2, 3...N). Here, as described above, this first measurement was performed with the center O of the rotation axis 304 approximately coinciding with the geometric center of the lens frame 501, as shown in FIG. 9A. _{Therefore ,} in _the second _measurement , the measured data having the maximum value in the Point B (x _b , y _b ), X
Measured point D (x _d , y _d ) with the minimum value in the axial direction, measured point A (x _a , y _a ) and Y with the maximum value in the Y-axis direction
Select the measurement point C (x _c , y _c ) that has the minimum value in the axial direction, and set the geometric center O _p of the lens frame as O _p (xo, y _p ) = (x _b + x _d /2, y _a + y _c /2) ...(1) The distance between the geometric centers of both lens frames of the frame 500 schematically shown in FIG. 9B, which is entered in advance from the keyboard 1000 described later
From the FPD and the interpupillary distance PD of the wearer's eye (FPD−
PD)/2=I to find the inward alignment amount I, and based on the upward alignment amount U from the keyboard 1000, calculate the position of the pupil of the wearing eye, that is, the position where the optical center of the lens to be processed should be located O _s ( _s X _{p , s} Y _p ) _as O _{s ( s X p , s Y p )} = ₍ PD/2, y _a +y _c /2+U) ...(2). Based on these _s X _p and _s Y _p values,
Drive the axis motor 206 and the Y-axis motor 224,
The frame holding device section 100 held between the hands 211 and 212 is moved, thereby the lens frame 50
The pupil center position O _s of No. 1 is aligned with the rotation center O of the sensor arm 302, the lens frame shape is measured again, and the measured values at the pupil center position O _s ( _s ρ _o , _s θ _o ) are obtained.
Find (n=1, 2, 3, ......, N).

In the measurement of the radius vector of the lens frame 501 described above, if the bevel feeler 356 comes off from the lens frame 501 during the measurement, the 9th
As shown by e in Figure A, the radius vector measurement data deviates significantly from the immediately preceding measurement data, so a radius change range a is determined in advance, and when the radius vector changes outside of that range, the rotation of the sensor arm section 302 stops. death,
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 and 325 sandwich the constant torque spring 316 and prevent its winding action, thereby preventing the arm 355 of the sensor head section 312 from getting caught on the lens frame and damaging the eyeglass frame 500. After such a shift of the feeler 356 occurs, the glasses frame 500 is returned to the initial measurement position and the measurement is performed again. In the unlikely event that the bevel feeler 356 becomes detached from the frame 500, the door 10a
(See FIGS. 1 and 3) is configured so that the housing 201 can be pulled out, making it easy for the operator to remove the filler.

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 is shown in Figs. 11 to 13C.
I will explain based on. Two parallel guide rails 602, 602 extend over the base frame 601, and a movable table 603 is slidably disposed on the rails 602. A feed screw 604 is screwed into the moving table 603.
is driven by a lens radius sensor motor 605 consisting of a pulse motor.

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

Cone-shaped flange 62 at the tip of the arm 621
As shown in FIG. 13, a modified H-shaped hand arm 623 is attached to one end of the hand arm 2 so as to be rotatable about an axis _O3 . hand arm 623
At the other end, two oval pieces 624, 624 are rotatably supported around the rotation center _O1 .
A contact ring 625 having a circular cross section in contact with the axis O ₁ is rotatably attached between the two oval pieces 624 and 624 so that the axis O ₂ is the rotation axis. Due to the coincidence of the contact surface of the contact ring 625 with this axis O ₂ and the rotatability of the oval piece 624 around the axis O ₂ , the contact ring 625 is attached to the edge of the processing lens LE as shown in FIG. 13B. When abutting, the contact point P coincides with the lens vector radius l, which coincides with the axis A of the arm 621. Therefore, it is possible to eliminate the error Δ that occurs when, for example, the contact ring 625 is fixedly supported on the hand arm 623 without providing the oval piece 624 as shown by the two-dot chain line in the figure.

A spring 627 is hung between the central arm portion 626 of the hand arm 623 and the arm 621, and acts to constantly pull the hand arm 623 upward. Hand arm 623 is arm 62
The horizontal position is maintained by a stopper piece 628 formed at the tip of 1. This hand arm 623
The structure of the processing lens is as shown in Fig. 13C.
Contact ring 625 due to large cut in LE and chipping etc.
When the object falls into the cut oyster, the hand arm 623 and the contact ring 6 are rotated clockwise by the lens.
This is to prevent 25 from being damaged. That is, when a force exceeding the limit is applied to the hand arm 623, the hand arm 623 pivots about the axis _O3 against the tension of the spring 627. Axis O ₃
The axis B connecting the fixed point of the spring 627 and the spring 627
When the hand arm 623 crosses the lens LE, the hand arm 623 rapidly pivots under the tension of the spring 627 and retreats from the lens LE, thereby preventing itself from being damaged.

At the lower end of the suspension table 613, as shown in FIG.
is attached, and a scale 615b implanted in the base arm 601 is inserted. With this configuration, the amount of movement of the lens vector radius measuring member 620 is detected, and the processing lens LE vector radius ρ′ _i (i=
1, 2, 3, ......, N).

Next, the configuration of a lens surface shape sensor for determining the lens edge thickness and bevel curve value will be explained. As shown in FIG. 11, the movable frame 610 is provided with two parallel guide rails 630, 630, and movable stages 631, 632 and a free stage 633, which are slidable on these rails 630, 630. 634 is installed. The moving stage 631 and the free stage 633 are connected by springs 635, 635. Similarly, the moving stage 632 and the three stage 634 are
6,636 are connected.

A feed screw 638 that is rotationally driven by a feeler motor 637 consisting of a pulse motor is screwed into the moving stages 631 and 632, and the screw directions of the feed screw 638 are opposite to each other with the center portion as a boundary. Since the rotation of the feed screw 638 moves the moving stages 631 and 632
move in opposite directions.

Pins 640, 640 are implanted in each of the moving stages 631, 632, and these pins are used to operate micro switches 641, 642 attached to the moving frame 610. That is, in FIG. 11, the pin 641 turns on the micro switch 641, and it is thereby detected that the movable stages 631 and 632 are located at the initial position, which is the maximum separation state. When the feeler motor 637 is rotated and the distance between the moving stages 631 and 632 is narrowed,
The pin 640 actuates the micro switch 642 to detect that the minimum separation state has been reached, and this detection signal stops the rotation of the feeler motor 637.

A feeler arm 650 is attached to the front end of the free stage 633, and its tip end is connected to the arm 620 of the lens radius sensor 620.
is stretched parallel to the axis A of the A feeler 651 is rotatably supported on a bent end portion of the feeler arm 650. The contact peripheral edge 651a of the feeler 651 coincides with the ridgeline of the contact ring 625, that is, the rotation axis _O1 of the oval piece 624. Similarly, a feeler arm 652 is attached to the front end of the free stage 634, and a feeler 653 is rotatably attached to the bent end of the feeler arm 652.

Detection heads 661a and 662a of magnetic encoders 661 and 662 are mounted on the central wall 660 of the moving frame 610, and their scales 661b and 662b are mounted on free stages 633 and 634, respectively. Thereby, the amount of movement of the free stage 633, that is, the amount of movement of the feelers 651, 653 can be detected.

As shown in FIG. 12, a push solenoid 671 is attached to the moving table 603. This solenoid 671 is a lens radius measuring device 620.
hand arm 623 and feelers 651, 65
3 approaches to a predetermined distance in the radial direction, the magnet is excited and acts to move the suspension table 613 away in order to retract the hand arm 623.

In addition, the lens radial sensor 6 is attached to the carriage 2.
20 and an opening 680 for moving the feeler of the lens surface shape sensor toward the lens side. A shielding plate 681 is provided to prevent grinding water from entering the lens measuring device through the opening 680 during lens grinding.
The shielding plate 681 is attached to the O-ring 6 on the lens rotation shaft 28.
Ring 683 rotatably inserted through 82
installed on.

Lens rotation axis 2 to measure lens radius, etc.
8 in the direction of arrow 684, the ring 68
3 is the shielding plate 6 due to the frictional force of the O-ring 682.
81 is also rotated at the same time to unblock the opening 680, and when further rotated, the blocking plate 681 comes into contact with a protrusion 686 formed on the carriage 2 and is prevented from rotating further. After that, O-ring 68
Only the lens rotation shaft 28 rotates against the frictional force of 2, and the lens LE can be rotated. vice versa,
During lens grinding, when the lens rotation shaft 28 is rotated in the direction of arrow 685, the shielding plate 681 is simultaneously rotated and closes the opening 680 again, and is brought into contact with a protrusion 687 formed on the carriage 2 to prevent subsequent rotation. is prevented, so the opening 680 continues to be blocked.

Electrical Control System The configuration of the electrical control system of this embodiment having the above-mentioned mechanical configuration will be explained with a block diagram based on FIG. Encoder 61 of lens radius sensor 620
5. Lens surface shape sensor encoder 661;
and 662 are counter circuits 820, 821, and 662, respectively.
823. The detection output from each encoder is sent to counter circuits 820, 821,
823, and the result is sent to the arithmetic control circuit 81.
Input to 0. In addition, the photosensor unit 4
27, Micro switches 641, 642 and 24
4 is also connected to the arithmetic control circuit 810.

The feeler motor 637, lens radius sensor motor 605, lens rotation axis motor 21, carriage movement motor 60, stopper motor 420, and grinding pressure motor 432 are controlled by the motor controller 824.
It is connected to the. Motor controller 824
is a device for receiving control commands from the arithmetic control circuit 810 to control how many pulses from the pulse generator 809 are output to which motors, that is, the number of rotations of each motor. The grindstone motor 5 is driven by an AC power source 826, and its rotation and stop are controlled by a switch circuit 825 controlled by commands from the arithmetic control circuit 18.

The arithmetic control circuit 810 is composed of, for example, a microprocessor, and its control is performed by a program memory 81.
It is controlled by a sequence program stored in 4. An input device 2000 and a display device 1000, which will be described later, are connected to the arithmetic control circuit 810. Further, the lens measurement data processed by the calculation control circuit 810 is stored in a lens data memory 827.
is transferred to and stored. The arithmetic control circuit 810 also controls the frame shape measuring device system 800.

Next, the configuration of the electrical system of this frame shape measuring device system 800 will be explained based on FIG. 15. Driver circuits 801 to 804 are connected to an X-axis motor 206, a Y-axis motor 224, a sensor arm rotation motor 301, and a guide shaft rotation motor 209, respectively. The drivers 801 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 read output of the read head 313 is counted by a counter 805 and inputted to a comparison circuit 806, and the radial change range a from the reference value generation circuit 807 is calculated.
is compared with the amount of change in the signal corresponding to . When the count value is within the range a, the count value in the counter 805 and the number of pulses from the pulse generator 809 are converted into radius vector information (ρ _o , θ _o ) by the arithmetic control circuit 810 and stored in the lens frame data memory 811. is entered and stored here. From the radial change range a, the counter 805
When the amount of change in the output of is large, the arithmetic control circuit 8
10 receives a signal to that effect, excites the electromagnetic magnet 318 of the spring device 315 via the driver 808, prevents the feeler 356 from moving, and stops supplying pulses to the driver 804.
Stop rotation of motor 301.

Input device and display device The input device and display device of this embodiment are shown in Fig. 16A.
As shown in FIG.
System start switches 2401, 2402,
It has a stop switch 2500 for temporarily stopping the drive. Here, function key 2200
A pump switch 2201 for supplying only grinding water; a grindstone switch 2202 for rotating only the grindstone; a handrail switch 2203 for commanding the supply of grinding water for the rotation of the grindstone for handrail processing;
Machining type selection switch 2204 for selecting either direct machining, which measures the lens frame shape of the frame and processes it based on this, or copying machining, which uses a template; auto/manual selection switch 22
05; Binocular-monocular selection switch 2206 for selecting whether to measure the lens frame shape of only one eye of the frame or the lens frame shape of both eyes with the frame shape measuring device; Pupil and frame geometry When entering the horizontal positional relationship with the academic center,
Selection switch 2207 for selecting whether to input PD and FPD or their relative amount (approach amount); Grinding pressure strength changeover switch 2208;
and a selection switch 2209 for selecting whether to perform bevel processing or flat processing during template processing.
Consisting of The input switch group 2303 includes a numeric keypad input switch 2300, a switch 2301 for canceling input using the numeric keypad, and a memory switch 2302 for storing input.
Incidentally, the operating states of these switches are indicated by the lighting of pilot lamps 2600 provided for each switch.

The display device 1000, as shown in FIG.
A controller 1400 converts the calculation results from the calculation control circuit 810 and input data from the input device 2000 into signals for driving the liquid crystal display 1100, and the signals from the controller drive the X rows of the dot matrix liquid crystal elements. It consists of an X driver 1200 for driving the Y column and a Y driver 1300 for driving the Y column.

Description of Operation of Apparatus Next, the operation of the above-mentioned lens grinding apparatus will be explained based on the flowchart shown in FIG.

Step 1-1: After turning on the main switch 2100, first, use the processing type selection switch 2204 to select whether to directly measure the lens rim of the frame and process it directly, or to process it using a template.

Step 1-2: The operator decides whether the bevel position setting is automatic or manual, and if it is automatic, press the selection switch 2205.
If the "auto" side is set to manual, press 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 stores either the direct machining sequence program or the template sequence program in the program memory 8.
Load from 14.

(1) Direct machining [The operation sequence when direct machining is selected will be explained below. ] Step 1-4: The operator measures only the shape of the lens frame for one eye of the frame and processes the other eye using the inverted data, or measures the shape of the lens frame for both eyes and uses the data for each. The binocular/monocular selection switch 2206 is used to select whether to process the original image.

Step 1-5: When inputting the horizontal positional relationship between the pupil center of the wearer's eye and the geometric center of the frame, the operator inputs PD and FPD, or inputs the relative amount (amount of shift) between the two. Decide what to do. PD, FPD
To input the
If you want to input the amount of shift, press the "shift" side.

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. frame 50
Insert the frame holding device section 100 set to 0 through the opening 100 of the device housing 1 and
It is temporarily held by A's hands 211 and 212.

Step 2-2: The lens frame left/right eye determining device 240 determines whether the lens frame 501 set on the measuring section 300 of the lens frame shape measuring device is for the left eye or the right eye. That is, the micro switch 244 of the determination device 240
is turned OFF, the arithmetic control circuit 810 determines that the lens frame positioned on the measurement unit 300 is for the left eye. On the other hand, even if the frame holding device section 100 is set in the support device section 200, the determination device 240
When the micro switch 244 remains ON, the arithmetic control circuit 810 determines that the lens frame positioned above the measurement unit is for the right eye.

Step 2-3: The determination result of the determination device 240, that is, whether it is a right-eye lens frame or a left-eye lens frame, is displayed on the liquid crystal display 1100 using characters 1113, as shown in FIG. 16B.

Step 2-4: The operator operates the chucking handle 29 to chuck the lens LE to be processed using the lens rotation shaft 28 of the carriage 2. At this time, the suction cup is suctioned 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 to coincide with the lens rotation axis.

Step 2-5: The operator inputs the patient's PD value using the numeric keypad switch 2300 according to the prescription, and presses the memory switch 2302 after completing the input. Arithmetic control circuit 8
10 temporarily stores the data in the internal memory and also displays the input data as "PD" on the display.
It is displayed on the display section 1101. Next, the worker
Enter the FPD value using the numeric keypad switch 2300,
After completing the input, press the memory switch 2302. The arithmetic control circuit 810 temporarily stores the data in an internal memory, and also displays the "FPD" display section 11 of the display 1100 via the controller 1400.
The input data is displayed in 02.

Next, the operator sets the amount U (see FIG. 9B) of the optical center of the lens LE using the numeric key switch 23.
Enter 00, and after completing the input, press the memory switch 2302.
Press. As a result, the arithmetic control circuit 810 stores the input data and displays the display 11.
00 is displayed on the "UP" display section 1103. However, if "shift" is selected in step 1-5, the relative amount (shift amount) of PD and FPD is input using the ten key switch.

Step 2-6: The operator determines the material of the lens to be processed, and if it is a glass lens, "G start" is displayed on the liquid crystal display 1100 shown in FIG. 16A.
Press the switch 2401 under 1105, or if the lens to be processed is a plastic lens, press the switch 2402 under "P start" 1106.

Step 2-7: Upon receiving the ON signal of the memory switch 2302 upon completion of inputting the input amount of the previous step, the arithmetic control circuit 810 drives the motor 224 of the frame shape measuring device 200 to move the frame holding device section 100 to the hand 211, The frame is held at 212, and then the motor 209 is driven to set the frame at the measurement position. Then, the motor 301 is rotated, and the sensor arm 302 is rotated. The counter 805 counts the output from the encoder reading head 313 for each unit rotation angle, and calculates the sensor arm rotation angle θ _o
Lens frame radius vector information (ρ _o , θ _o ) is obtained from the radius vector measurement value ρ _o from the counter 805. Since the rotation center of the sensor arm 302 does not necessarily coincide with the geometric center of the lens frame, this measurement data is stored in the lens frame data memory 811 as a preliminary measurement value.

Step 2-8: Based on the lens frame radius vector information (ρ _o , θ _o ) obtained in the preliminary measurement in the previous step, the PD data, FPD data, and overlay amount U input in step 2-2, the above-mentioned amount is calculated. According to equation (2), the optical center position O _s (X _s ,
Y _s ) is calculated by the calculation control circuit 810.

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

Step 2-10: Connect sensor arm 30 via driver 804
A counter 805 counts the output from the read head 318 of the encoder and uses the pulse generator 809 to rotate the motor 301.
Both of the pulse numbers from 1 and 2 are input to the arithmetic control circuit 810, new radius vector information ( _rs ρ _o , _rs θ _o ) of the lens frame is obtained from both data, and this is stored in the lens frame data memory 811 . This is called the actual measurement of the lens frame.

Step 3-1: The arithmetic control circuit 810 is the motor controller 82
4 to rotate the lens rotation shaft motor 21 to rotate the lens rotation shaft 28 in the direction of arrow 684.
This unblocks the opening 680 of the blocking plate 681. Next, the arithmetic control circuit 810 uses lens frame data ( _rs ρ _o , _rs θ _o ) (n=1, 2,
3,......,N), 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 .
In addition, the lens radius sensor motor 605 has a radius value _r.
The number of pulses corresponding to _s ρ ₁ is supplied from the pulse generator 809, and the moving frame 610 is connected to the unprocessed lens.
Move it to the LE side. As the moving frame 610 moves forward, the arm 6 of the lens radius sensor 620
21 is also moved forward by the tensile force of the constant torque spring 614, and its contact ring 625 comes into contact with the edge surface of the unprocessed lens LE. The moving position of the arm at this time is detected by the encoder 615, and the counter 820
The count value is counted by the arithmetic control circuit 810.
It is calculated as the radius vector (radius) R ₁ of the lens LE on _{the rs} θ ₁ radius line, and is stored in the lens data memory 827 (R ₁ ,
_rs θ ₁ ) (FIG. 18B).

Next, when the pin 640 of the moving stage 632 turns on the micro switch 642, the feeler motor 637 for rotating the feeler motor 637 and moving the moving stages 631 and 632 is activated by the arithmetic control circuit 810 and the motor controller 8.
24 to stop its rotation. As the moving stages 631 and 632 move, free stages 633 and 634 connected to them by springs 635 and 636 slide on the rails 630 and 630. As a result, feelers 651, 653
contacts the front and back surfaces of the lens at the radial value _rs ρ ₁ , respectively. Feeler 651 at this time,
The positions of 653 are detected by encoders 661 and 662, respectively, and input to the arithmetic control circuit 810 as count values _f Z ₁ and _b Z ₁ via counters 821 and 822, and the arithmetic control circuit 810 stores these in the lens data memory 827. Transfer and memorize.

Below, similarly, the lens radius at the radial angle _rs θ _N
R _N , feeler positions _f Z _N , _b Z _N are determined, and all information ( _rs θ _i , R _i , _f Z _i , _b Z _i ) (i=1, 2, 3,
......, N) is input to the lens data memory 827 and stored. This allows feeler 65
1,653 traces the lens frame radius vector information ( _rs ρ _o , _rs θ _o ) as a locus T on the unprocessed lens LE, as shown in FIG. 18B.

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 vector radius ρ _i at its radius vector angle θ _i . When R _i <ρ _i , it is determined that a lens with the desired lens frame shape cannot be obtained even if the lens is ground, and a warning is displayed on the display 1100 by the display device 1000, and the subsequent steps are executed. cancel. When R _i ≧ρ _i , the process moves to the next step.

Step 3-3: The arithmetic control circuit 810 stores the lens data memory 82
Feeler position information ( _f Z _i ,
_b Z _i ), as shown in FIG. _19A , the feeler position information _{( f}
Z _A , _b Z _A ), ( _f Z _B , _b Z _B ), the front radius of curvature _f of the unprocessed lens, the rear radius of curvature _b , and the center position of the front curvature of the unprocessed lens _f Z _O and the position of the rear center of curvature _b
From Z _O Find _f and _b from

Next, based on _f and _b , calculate the curve value C _f of the front refractive surface of the lens LE, and the curve value C _b of the rear refractive surface, respectively. (where n is the lens refractive index) and stored in the memory 827. In addition, _f , _b and lens frame radius information ( _rs ρ _o , _rs
Edge thickness △ for each unit angle from θ _o ) to the total radial angle θ _o
Let n be △n= _b Z _o − _f Z _o =√ _b ² − _o ² −√ _f ² − _o ²
...(7) and input this value into the lens data memory 827 and store it.

Step 3-4: The arithmetic control circuit 810 obtains the lens frame vector radius information ( _rs ρ _M , _rs θ _M ) having the maximum edge thickness _Δnax and the minimum edge thickness Δ _niN from the lens frame data memory 811 and _rs ρ _N ,
_rs θ _N ). Next, based on the predetermined bevel shape G of the bevel grinding wheel 3b, the bevel apex P of the lens after bevel processing is on the front side of the edge thickness:
Position the bevel apex so that it is at the rear = 4:6 position.
_e Z _M , _e Z _N Find it as. Next, based on the determined bevel apex positions Z _M and _e Z _N , the bevel curve value C _P is calculated using the same solution as the above-mentioned equations (4) and (7), and the bevel curve value C _P is calculated. From the edge thickness △ _o , the bevel apex position _e Z _i (i=1, 2, 3, ......, N) for each radial angle
are input into the lens data memory 827 and stored.

Step 3-5: The bevel shape between the maximum and minimum edge thickness determined in step 3-4 is displayed on the liquid crystal display 1100 as an automatic bevel cross-sectional view 1110, as shown in FIG. 16B. Here, the solid line schematically shows the bevel shape with the maximum edge _Δnax , and the broken line schematically shows the bevel shape with the minimum edge _Δnio , so that the apexes of each bevel coincide.

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

Step 3-7: When the operator inputs "manual" in the previous step 1-2, the arithmetic control circuit 810 displays the characters "curve" and "curve" on the liquid crystal display 1100 of the display device 1000, as shown in FIG. 16B. The operator is prompted to enter the desired numerical values. The operator operates the numeric keyboard 2300 to input a desired curve value. LCD display 1
The input data is displayed in the "Curve" field of 100, and after confirming it, the operator presses the "memory" switch 23.
02 to store the input data in the internal memory of the arithmetic control circuit 810. Next, the operator presses the "shift" switch on the switch 2207, and then presses the numeric key switch 23 to set the desired shift amount of the bevel apex obtained in previous steps 3-5 and 3-6 in millimeters.
Operate and input 00. The input data is displayed on the "alignment" display section 1112 of the liquid crystal display 1100.
will be displayed.

Step 3-8: Simultaneously with the above operation, the arithmetic control circuit 810 shifts the bevel apex position of the minimum edge obtained in step 3-5 based on the input amount of adjustment by the amount of adjustment, and shifts the bevel apex position of the minimum edge by the amount of adjustment based on the input amount of adjustment. Each radial angle _rs θ _i
(i = 1, 2, 3...N), the bevel position information _e Z _i is obtained, and both the bevel apex positions of the minimum bevel and maximum bevel are displayed on the manual bevel shape display section 112 of the liquid crystal display 1100.
Graphically display on 0. Here, the solid line indicates the maximum bevel shape, and the broken line indicates the minimum bevel shape. The example in FIG. 16B shows the bevel shape when the bevel apex is moved to the rear and the bevel curve is small (the radius of curvature is large) compared to the auto mode.

The operator looks at the bevel shape display and, if the bevel position is unsatisfactory, inputs the amount of approach and the bevel curve again, causes the arithmetic control circuit 810 to calculate the bevel shape based on the new input, and displays it 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 looks at the automatic or manual bevel shape display 1110, 1120, and when selecting automatic bevel, turns on the start switch 2401 under that display. When selecting manual regeneration, turn on the start switch 2402 below the display.

Step 4-1: The arithmetic control circuit 810 determines from which start switch the signal was received in step 2-6. “G start” side selection switch 2401
In the case of a command from
If the command is from the "start" side selection switch 2402, the process moves to step 4-3.

Step 4-2: The arithmetic control circuit 810 stores the lens frame data memory 8.
Lens frame radius vector information ( _rs ρ _o ,
_rs θ _o ) with maximum radius _rs ρ _nax ( _rs ρ _nax , _rs
θ _nax ). Subsequently, the lens rotation shaft motor 21 is rotated via the motor control circuit 824, and the lens LE is continuously rotated.

Next, the arithmetic control circuit 810
Turn on 5 and rotate the grindstone motor 5. The arithmetic control circuit 810 then rotates the abutment motor 420 based on the vector radius _rs ρ _nax , and the abutment member 422
The horizontal cutting surface 422b of the rough whetstone 3a is lowered to a height of a distance d _nax from the whetstone surface of the rough whetstone 3a. Here, d _nax has the relationship between the maximum lens frame vector radius _rs ρ _nax and the radius r of the ring 27a as follows: d _nax = _rs ρ _nax −r (9).

As the abutting member 422 descends, the carriage 2 descends, and the lens LE to be processed is ground by the rough grindstone 30. When the lens LE to be processed is ground until the radius vector becomes _rs ρ _nax , the ring 27
a comes into contact with the stopper member 422 and swings it, and the light shielding rod 429 connects to the photosensor unit 427.
(see FIG. 2), and inputs the interruption signal to the arithmetic control circuit 810. Arithmetic control circuit 8
10 continues to count the number of pulses corresponding to one rotation of the lens rotation axes 28a and 28b, and if no cutoff signal from the photosensor unit 427 is input during that time, the entire circumference of the lens to be processed _{is rs} ρ _nax It is judged that it has been machined to a radius vector of .

Next, the arithmetic control circuit 810 reads the data ( _rs ρ ₁ , _rs θ ₁ ) from the lens frame data memory 811, controls the rotation of the lens rotation axis motor 21 based on the data of _rs θ ₁ , and rotates the lens LE to be processed. Rotate. Next, the stopper motor 420 is controlled based on the radius vector data of _rs ρ ₁ , and the stopper member 42
2 to a height of d ₁ . As shown in FIG. 20, in general, the height d _i of the abutting member 422 is determined by d _i = rs ρ i ₋ so that the relationship between the radius vector _rs ρ _i and the ring r can be obtained from equation ( ₈ ). r (i=1, 2, 3, ......, N)
...(8)′

By lowering the abutment member 422, the lens LE to be tested is further roughly ground, and when it is ground to the vector radius of _rs ρ _i , the photosensor unit 427 again inputs a cutoff signal to the arithmetic control circuit 810. When the arithmetic control circuit 810 receives the signal, it reads ( _rs ρ ₂ , _rs θ ₂ ) from the lens frame data memory 811 as data, rotates the lens LE to the angle of _rs θ ₂ , and stops the lens LE based on _rs ρ ₂ . The member 422 is lowered to a height d ₂ and the lens LE is ground. Thereafter, by similarly grinding the lens LE to ( _rs ρ _N , _rs θ _N ), the processed lens LE is adjusted to the lens frame data ( _rs
ρ _i , _rs θ _i ).

Step 4-3: The lens is moved by the carriage movement 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 control circuit 810 controls the stopper motor 420 via the motor controller 824 to raise the carriage 2 and remove the rough-ground processed lens LE from the rough grindstone 3a, and then the carriage moving motor 60 Control the lens LE to bevel grindstone 3
Place it above b.

Next, the arithmetic control circuit 810 obtains lens frame radius vector information ( _rs ρ _i , _rs θ _i ) from the lens frame data memory 811.
(i = 1, 2, 3...N), and the corresponding bevel position information _e Z _i from the lens data memory 827. Based on these data, the lens rotation axis motor 21, The stopper motor 420 and the carriage moving motor 60 are controlled to perform bevel processing on the roughly ground lens using the beveling grindstone 3b.

Step 4-5: After the bevel processing is completed, the arithmetic control circuit 810 controls the stopper motor 420 to return the carriage 2 to its home position on the bevel grinding wheel and turns on the switch 825.
OFF and stop 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. This rotates the light shielding plate 681 and opens the opening 680. 21st
As shown in FIGS. A and 21B, the calculation control circuit 810 rotates the lens radius sensor motor 605 to move the moving frame 610 forward. Accordingly, the lens radius sensor 620 has a constant torque spring 6.
The contact ring 625 is moved forward with a tensile force of 14 and comes into contact with the vertex of the beveled edge of the lens LE. Since the lens rotation axis 28 is rotated, the encoder 61
5 is the radial information of the lens LE ( _rs ρ _i ′, _rs θ _i ′) (i=
1, 2, 3, .

Step 4-6: The arithmetic control circuit 810 stores the lens frame data memory 8.
Lens frame radius vector information ( _rs ρ _i ,
_rs θ _i ) and the lens vector radius information ( _rs ρ _i ′, _rs θ _i ′) of the processed lens measured in the previous step 4-5 to determine whether or not they match. If the two match, the process moves to step 4-8, and if they do not match, the process moves to step 4-7.

Step 4-7: When _rs ρ _i ′ is larger than _rs ρ _i , the stopper member 4
Lower the height d _i of 22 by a small amount and repeat step 4-
Return to step 4 and perform bevel processing.

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

Step 6-1: The arithmetic control circuit 810 determines whether or not the grinding process has been completed for the binocular lenses. If the grinding process has not yet been completed, the process proceeds to step 5-2. When it is determined that the step is finished, all steps are finished.

Step 6-2 and Step 6-4 The arithmetic control circuit 810 determines whether binocular measurement or monocular measurement was selected in step 1-4, and if "monocular" is selected, the next step is performed. Proceed to step 6-3. When "binocular" is selected, the liquid crystal display 1 of the display device 1000
100 is displayed, and the operator is prompted to set the lens frame 501 for the other eye. Below is the step 2-
After executing steps 2 to 2-4, the process moves to step 2-7.

Step 6-3: When Step 1-4 is a single-eye measurement command, the arithmetic control circuit 810 converts the right eye lens frame measurement data ( _rs ρ _o , _rs θ _o ) obtained in Step 2-6 into polar coordinates-orthogonal coordinates. After conversion, the orthogonal coordinate data ( _rs
X _{i , rs} Y _{i ) ( i} = ₁ , _{2 ,} 3, ...... _, N), a new Lens frame shape data ( _ls X _i , _ls Y _i )
seek. This data is obtained by inverting the shape of the lens frame of the right eye using the Ys axis of the _{Xs - Ys} coordinate with the origin at the optical center _Os ' as the axis of symmetry, as shown in Figure 9C. Cartesian coordinates - polar coordinates transformation ( _ls ρ _o ,
_ls θ _o ) is stored in the lens frame data memory 811 as the left eye lens frame shape.

After executing steps 2-4 and 2-6, the process moves to step 3-1.

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

Step 5-1: Attach the frame 5 to the template holder 27b of the carriage 2.
Attach the template SP with 00 stamped in advance.
(See FIG. 22) Step 5-2: The lens LE to be processed is chucked by the lens rotation shaft 28 of the carriage 2.

Step 5-3: The operator determines the material of the lens to be processed, and presses the switch 2401 or 2402 below the respective indications of "G start" if it is glass, or "P start" if it is plastic. push. If switch 2401 is turned on, step 5-4
If the switch 2402 is turned on, the process moves to step 5-5.

Step 5-4: The arithmetic control circuit 810 turns on the switch 825.
The grindstone motor 5 is rotated 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 abutting motor 420 lowers the arcuate portion 422a of the abutting member 422 under the control of the arithmetic control circuit 810 until it is at the same height as the glass rough grindstone 3a. As a result, rough grinding of the lens LE is started. When the cutoff signal from the photosensor 427 is continuously output for one rotation of the lens rotation shaft 28, the arithmetic control circuit 810 determines that rough grinding is complete, and controls the stopper motor 420 to set the carriage 2. After raising it to the position, the switch 825 is turned OFF to stop the grindstone 3.

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

Step 5-6: The operator inputs using the selection switch 2209 whether the lens after rough grinding should be beveled or smoothed.

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

Step 5-8: The arithmetic control circuit 810 rotates the lens rotation shaft 28 by rotating the motor 21, and opens the aperture 6.
At the same time, as shown in FIGS. 23A and 23B, the lens radius sensor motor 605 is controlled to move the moving frame forward, and the constant torque spring 614 is opened.
The contact ring 625 is brought into contact with the edge of the roughly ground lens LE with a tensile force of . Encoder 615 is a lens
LE machining radius _i (i=1, 2, 3,......,
N) and inputs the data to the arithmetic control circuit 810 via the counter 820. The arithmetic control circuit 810 also sets a predetermined amount α to the radius vector measurement value _i.
The feeler 651, 6 is placed at the reduced position ( _i − α).
The motor 605 is controlled so that the free stage 63 comes, and the motor 637 is also controlled so that the free stage 63
3,634 in a free state and filler 65
Front position _{f i} of lens LE that has been roughly ground at 1,653
and rear surface position _{b i} by encoders 661, 662
Let it be measured.

Below are steps 3-3 to 3-9 and 4 described above.
Execute -4 to finish machining.

Step 7-1: If the operator selects smoothing in step 5-6, the arithmetic control circuit 810 reads this in step 5-7, and the carriage moving motor 60
Rotate the lens LE to be processed using the smoothing whetstone 3d.
It moves upwards, and then lowers the carriage 2 to perform flat precision machining.

Automatic detection device for template machining In the above-described embodiment, the selection between direct machining and template machining is made by the command of the selection switch 2204, but in FIGS. This is an example of how to automatically issue commands upon installation.

A bearing 710 is attached to the arm 34 of the carriage. The bearing 710 has a slot 711 formed along its longitudinal direction. 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. A pin 715 is implanted on the outer periphery of the shaft 714. This pin 715 is normally in contact with the end face of the bearing and prevents the shaft 714 from moving in the axial direction. A spring 718 is further hung on the end of the shaft 714 to constantly pull the shaft 714 in the direction of arrow 716 in FIG. 10A. Since this spring 718 is twisted in the direction of arrow 716, a force is applied to rotate shaft 714 in the direction opposite to arrow 717. A contact ring 720a of a microswitch 720 is in contact with the tapered portion 713. Microswitch 720 is connected to arithmetic control circuit 810.

As shown in FIG. 10B, the stopper lever 712 has a notch 712a formed therein, so that when the lever 712 is rotated, the pin for holding the template SP embedded in the end of the lens rotation shaft 28 is inserted. It works to cover the center pin 28a from above and prevent the template SP from coming off.

Next, the operation of this embodiment will be explained. When machining templates, the operator must hold the lens rotation axis 2 of the carriage 2.
Attach the template SP to the template holding pin 8. Next, the stopper lever 712 is rotated clockwise in FIG. 10B until the notch 712a abuts the center pin 28a. When the pin 715 is in the slot 711, the tension of the spring 718 causes the shaft 714 to move in the direction of the arrow 716. As the shaft 714 moves, the micro switch 720 is turned on by the tapered portion 713 of the shaft 714, and the arithmetic control circuit 810 can automatically receive a template machining command.

[Brief explanation of drawings]

FIG. 1 is an external perspective view with one end cut away showing the mechanical part of a lens grinding device according to the present invention, and FIG.
3 is an external perspective view of the frame shape measuring device, FIG. 4A is a perspective view of the frame holding device, FIGS. 4B and C are explanatory diagrams showing its function, and FIG. 5 6 is a vertical cross-sectional view of the frame holding device, FIG. 6 is a vertical cross-sectional view showing the structure of the spring member, FIG. 7A is a schematic diagram showing the relationship between the support device and the sensor, and FIG. 7B is its 8 is a partially cutaway side view showing the sensor section, FIG. 9A is a schematic diagram showing the relationship between determining the geometric center and optical center from the measured values of the lens frame, and FIG. 9B is the frame.
A schematic diagram showing the relationship between PD and PD, Figure 9C is a schematic diagram showing the relationship between right eye lens frame data and left eye lens frame data, and Figures 10A and B are diagrams showing the automatic detection device for template processing. , Fig. 11 is a plan view of the lens measuring device, Fig. 12 is a sectional view taken along line XII-XII' in Fig. 11, and Fig.
3A to 3C are diagrams showing the structure and function of the tip of the lens radius sensor section, FIG. 14 is a block diagram showing the electrical system of the present invention, and FIG. 15 is a block diagram showing the electrical system of the frame shape measuring device. 16A is a diagram showing a display device and an input device, FIG. 16B is a diagram showing another display example of the display device, FIG. 17 is a flowchart showing the operation sequence of the present invention, FIG. 18A,
B, Fig. 21 A, B, Fig. 23 A, B are schematic diagrams to show the operation of the lens measuring device, Fig. 19 A,
B is a schematic diagram showing the relationship between lens curve and edge thickness;
FIGS. 20 and 22 are diagrams showing the relationship between the carriage and the abutting member. DESCRIPTION OF SYMBOLS 1... Device housing, 2... Carriage, 3... Grindstone, 10a... Door, 28a, 28b... Lens rotation axis, 100... Frame holding device part, 201
. . . Housing, 202a, 202b .
2...Sensor head portion, 352...Sensor shaft, 354...Notch surface, 356...Bevel feeler, 810...Arithmetic control circuit.

Claims (1)

[Scope of Claims] 1. A carriage having a lens rotation shaft for holding a lens to be processed, a grindstone that rotates at high speed to grind and bevel the lens to be processed;
a carriage moving means for changing the distance between the axis of rotation of the lens and the axis of rotation of the grindstone; a means for controlling the amount of rotation of the axis of rotation of the lens based on lens frame shape data of an eyeglass frame; An eyeglass frame shape measuring device for inputting shape data of the lens frame into a lens grinding device having means for controlling the amount of movement of a carriage by a moving means, comprising: a frame holding means for holding the eyeglass frame; The present invention includes a bead-shaped feeler that can come into contact with a bevel groove of a lens frame and has an inclination angle that is approximately equal to an inclination angle of a bevel of the grindstone of the lens grinding device, and a measuring means that measures the amount of movement of the feeler. A frame shape measuring device characterized by: 2. The frame shape measuring device according to claim 1, wherein the feeler is configured to be rotatable around an axis substantially parallel to the rotation axis of the sensor arm. 3. The feeler is movably supported on the axis of a sensor arm that rotates about an axis that is substantially perpendicular to a plane including at least one point on the locus of the bevel groove and located within the lens frame, and the feeler 2. The frame shape measuring device according to claim 1, wherein: measures the rotation angle of the sensor arm and the amount of movement of the feeler on the axis.