JPH0524438Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a lens grinding device for grinding a fabric spectacle lens in order to fit the spectacle lens into a lens rim of a spectacle frame.

PRIOR ART A conventional lens grinding apparatus has a carriage having a lens rotation shaft that holds and rotates a lens to be processed, and a grindstone for grinding the lens to be processed, as one unit.

Problems to be solved by the present invention Conventional lens grinding equipment has
There was a problem in that the lens shape detection means for measuring the lens to be processed was covered with grinding water, making it difficult to maintain high measurement accuracy.

Further, Japanese Patent Application No. 57-211462 discloses a lens centering machine that determines the outer diameter of a lens by limiting the cut of a grindstone into a centered lens by a stopper screw. However, in this device, both the stopper screw and the stopper surface that it comes into contact with are exposed to the grinding position by the grindstone, and during lens grinding, both the stopper screw and the stopper surface are covered with grinding water and grinding debris, making it difficult to maintain high grinding accuracy. The problem was that it was difficult.

The present invention has been developed in view of the above-mentioned problems with conventional lens grinding devices, and is designed to cover the opening through which the filler of the lens shape detection means is evacuated. Therefore, it is an object of the present invention to provide a lens grinding device that can effectively prevent the detection portion of the lens grinding device from being covered with water and maintain high accuracy of the lens shape detection means.

Structure of the Invention The present invention includes a carriage having a lens rotation shaft for holding and rotating a lens to be processed, a grindstone for grinding the lens to be processed, and the workpiece held by the lens rotation shaft. A lens grinding device comprising: a lens processing chamber in which a lens and the grindstone are disposed to grind the lens to be processed; and a control unit for causing the grindstone to grind the lens to be processed. , at least one filler for contacting the lens to be processed, which is provided in a feeler storage section adjacent to the lens processing chamber, and the filler is applied to the lens to be processed through an opening provided in the filler storage section. It is comprised of a moving mechanism disposed in the feeler storage section for moving the feeler, and a shielding part that opens and closes to cover the opening by the control section in response to the movement of the feeler by the moving mechanism, A lens grinding apparatus characterized in that it has a lens shape measuring means for detecting the amount of movement of the lens and measuring the shape of the lens to be processed.

Effects of the Invention The present invention includes at least one feeler for contacting the lens to be processed, which is provided in a feeler storage section adjacent to the lens processing chamber, and a filler that is provided in a feeler storage section adjacent to the lens processing chamber, and a filler through which the lens to be processed passes through an opening provided in the filler storage section. a moving mechanism disposed within the filler housing for moving the filler with respect to the lens; and a shielding member that opens and closes to cover the opening by the control unit in response to the movement of the filler by the moving mechanism. Since the lens shape detecting means is composed of the following, when the filler of the lens shape detecting means is retracted, the opening through which the filler passes is shielded, thereby effectively preventing the detection part of the lens grinding device from being covered with water, This has the advantage that the accuracy of the lens shape detection means can be kept high over a long period of time.

(Example) Overall configuration of apparatus FIG. 1 is a perspective view showing the overall configuration of a lens grinding apparatus according to the present invention, with a partially cutaway cross section. At the lower front of the housing 1 is a frame shape measuring device 20, which will be described later.
0 is built-in, and the front wall of the housing 1 has an opening 10 for putting in and taking out the frame holder.
is formed. A vertically swinging door 10a is attached below the opening. Furthermore, a keyboard 1000 and a display device 2000, which will be described later, are arranged vertically on the upper right side of the front wall surface.

In the whetstone chamber 30 of the housing 1, there are a rough whetstone 3a for a glass range and a rough whetstone 3 for a plastic lens.
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 rotating 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 chucking handle 29, thereby moving the lens LE to be processed onto the rotating 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 2 that comes into contact with an abutting device 42, which will be described later.
7a, and a template holding part 27b for holding the template.
is installed.

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.

At the end of the shaft 11, a frame 4 for moving the carriage is fitted onto an arm 40. 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 support column 421, and a stopper member 422. motor 42
A feed screw 423 attached to the rotating shaft of 0 is threadedly engaged with a female 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 grinding 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 adopted 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. You 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 mainly consists of three parts: a frame holding device 100 that holds a frame;
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 the movement within the measurement plane;
The measuring unit 300 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, 266 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 similarly has two slopes 217, 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 a rear flange 221 of the moving stage 203, and a Y-axis motor 224 consisting of a pulse motor having a pulley 223 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 321 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 located in the center of both side flanges 151, 151 having pieces 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
There is a side 153a, 1 between the flange 50a and the flange 151.
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 aforementioned frame holding rods 152, 152 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 plate 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 153 of the movable base 153
a and 153a are the slopes 21 of the hand 211, respectively.
6 and the slope 218 of the hand 212.

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 section 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
The lens frame shape is measured from the reading amount ρ from 3 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, the second measurement uses the first measurement data (ρ _o , θ _o ) in polar coordinates -
From the data (X _o , Y _o ) after orthogonal coordinate transformation,
Point B (x _b , y _b ) with the maximum value in the axial direction, Point D (x d , y d ) with the minimum value in the X-axis direction, Point D (x _d , y _d ) with the maximum value in the Y-axis direction Select A (x _a , y _a ) and the measured point C (x _c , y _c ) that has the minimum value in the Y-axis direction,
After determining the geometric _center O _{0 of the} lens frame as O ₀ (x ₀ , y ₀ ) = (X _b + The distance between the geometric centers of both lens frames of the frame 500 schematically shown in FIG. 9B
From the FPD and the interpupillary distance PD of the wearer's eye (FPD−
PD)/2= to find the amount of inward deviation, and based on the amount of upsetting U from the keyboard 1000, 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 (sX ₀ , sY _{0 ) as O s} ( _s X ₀ , _s Y ₀ ) = ( _{X 0} +, _{Y 0} + _U ) = _a + y _c /2 + U) ...(2). The _{X -} axis motor 206 and the Y-axis motor ₂₂₄ are driven based on the _s
The pupil center position _Os coincides 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 _{Os are} ( _s ρ _o , _s θ _o )
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 the feeler 356 is dislodged, 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 does not come off the frame 500,
a (see FIGS. 1 and 3) and the housing 201 can be pulled out, making it easy for the operator to 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 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
Connect the shaft plug B connecting the fixed point of the spring 627 with 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 free stages 633, 632 are slidably mounted on these rails 630, 630. 634 is installed. The moving stage 631 and the free stage 633 are connected by springs 635, 635. At the same time, the moving stage 632 and the free stage 634 are
6,636.

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 is attached to the arm 620 of the lens radius sensor 620 described above.
is stretched parallel to the axis A of the A feeler 651 is rotatably supported on the 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 portion of the tip thereof.

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 683, 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 an arithmetic control circuit 810.

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 of 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 lighting of the piezo 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, the processing type selection switch 2204 is used 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 with 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 204 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 "FDP" 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 ρn 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, calculate the above-mentioned amount. 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. is equal to 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 313 of the encoder, and uses the counted value and a 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 calculates the lens frame data ( _rs ρ _o , _rs θ _o ) (n=1, 2, 3,
..., N) is read from _the memory ₈₁₁ , and the _{lens rotation shaft 28 is stopped at that position based on rs θ 1 .} Further, a 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 toward the unprocessed lens LE side. As the moving frame 610 moves forward, the arm 621 of the lens radius sensor 620 also moves forward due to the tensile force of the constant torque spring 614, and its contact ring 6
25 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 counted by the counter 820, and the counted value is calculated by the arithmetic control circuit 810 as the moving radius (radius) R ₁ of the lens LE on the _rs θ ₁ radius line, It is stored in the lens data memory 827 as (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 651,6 at this time
The positions of 53 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. As a result, the feelers 651 and 653 obtain lens frame radius vector information ( _rs
ρ _o , _rs θ _o ) will be traced as a trajectory 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 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 uses 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 ) and the front radius of curvature _f of the unprocessed lens
From R, the rear radius of curvature _b , the front curvature center position _f Z ₀ of the unprocessed lens, and the rear curvature center position _b Z ₀ , _f ² = ρ _A ² + ( _f Z ₀ − _f Z _A ) ² _f ² = ρ _B ² + ( _f Z ₀ − _f Z _B ) ² …(4) _b ² = ρ _A ² + ( _b Z ₀ − _b Z _A ) ² _b ² = ρ _B ² + ( _b Z ₀ − _b Z _B ) ² ... Find _f and _b from (5).

Next, based on _f and _b , the curve value C _f of the front refractive surface of lens LE and the curve value C _b of rear refractive surface C _f = n-1/R _f ×1000 C _b = n-1/ R _b ×1000...(6) (where n is the lens refractive index), and this is stored in the memory 827. In addition, the edge thickness Δn for each unit angle from _f , _b and the lens frame radius information ( _rs ρ _o , _rs θ _o to the total radial angle θ _o is expressed as Δn = _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 receives the lens frame vector radius information ( _rs ρ _M , _rs θ _M ) having the maximum edge thickness Δ _nax and the minimum edge thickness Δ _nio from the lens frame data memory 811 and _rs ρ _N , _{rs θN} )
Select. Next, the predetermined bevel grindstone 3
Based on the bevel shape G in b, the bevel apex P of the lens after bevel processing is the front side of the edge thickness: the back side =
Adjust the bevel apex position _e Z _M , _e so that it is at the 4:6 position
Find Z _N as _e Z _M = _f Z _M +4/10Δ _{M e} Z _N = _f Z _N +4/10Δ _N (8). Next, based on the obtained bevel apex positions _e Z _M and _e Z _N , the bevel curve value C _P is determined by the same solution method as the above-mentioned equations (4) and (7), and the bevel curve value C _P The bevel apex position _e Z _i (i=1, 2, 3, . . . , N) for each radial angle is determined from the edge thickness Δ _o and input to 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 deviation by the amount of deviation, and also shifts the bevel apex position of the minimum edge obtained in step 3-5 based on the input amount of deviation. 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
If the command is from ``P'', go to the next step 4-1.
If the command is from the "start" side selection switch 2402, the process moves to step 4-3.

Step 4-1: The arithmetic control circuit 810 stores the lens frame data memory 8.
Lens frame radius vector information ( _rs ρ _o , _rs
rs P _nax and _rs θ _nix having the maximum vector radius _rs ρ _nax from θ _o ) are read. Next, the lens rotation axis 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 abutting motor 420 based on the vector radius _rs P _nax , and the abutting 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 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 determined that it has been machined to a vector radius 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 abutment motor 420 is controlled based on the radius vector data of _rs ρ ₁ , and the abutment member ₄₂₂ is
lower to the height of As shown in FIG. 20, generally, the height d _i of the abutting member 422 is equal to the vector radius _rs ρ _i
d _i = _rs ρ _i −r (i = 1, 2, 3, ..., N) so that the relationship between
…(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 . lowering the member 422 to a height d ₂ ;
Grind the lens LE. Similarly, ( _rs ρ _N , _rs
By grinding the lens LE to θ _N ), the lens LE to be processed is ground into the shape of 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 abutment motor 420 via the motor controller 824 to raise the carriage 2 and remove the rough-ground processing lens LE from the rough grindstone 3a, and then the carriage movement 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 ) (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 and the stop motor are activated. 420, the carriage movement motor 60 is controlled to perform beveling 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, ..., N) is detected, and this is transmitted to the arithmetic control circuit 810 via the counter 820.
It is measured in

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 are compared to determine whether or not they match. If they match, proceed to step 4-8; if they do not match, proceed to step 4-8.
Move to 7.

Step 4-7: When _rs ρ _i ′ is larger than _rs ρ _i , the stopper member 42
Lower the height d _i of step 2 by a small amount and repeat step 4-4.
Return to 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,
Remove the lens that has been processed 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 above 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), new lens frame shape data is created as l _s X _i = - _rs X _i l _s Y _i = - _rs Y _i ...(3) (l _s X _i , l _s Y _i )
seek. This data is obtained by inverting the lens frame shape of the right eye with the axis of symmetry as the _Ys axis of the _Xs - _Ys coordinate with the optical center Os _' as the origin, as shown in Figure 9C. Cartesian coordinates - polar coordinates transformation (l _s ρ _o ,
l _s 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 on which 00 has been pre-shaped (see FIG. 22). Step 5-2: Chuck the lens LE to be processed using the lens rotation shaft 28 of the carriage 2.

Step 5-3: The operator determines the material of the lens to be processed, and if it is glass, press the switch 2401 or 2402 below the display for "G start" and for plastic, "P start". 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 to the lens rotation shaft 28 for one rotation, 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 movement 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 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
Machining radius _i of LE (i=1, 2, 3,..., N)
is measured, and the data is input to the arithmetic control circuit 810 via the counter 820. Arithmetic control circuit 8
10 also has feelers 651 and 65 at the position where the radius vector measurement value _i is subtracted by a predetermined amount α ( _i − α).
At the same time, the motor 637 is controlled so that the free stage 63
3,634 in a free state and filler 65
At step 1,653, the front position _{fi and} the rear position _{b i} of the roughly ground lens LE are measured by encoders 661 and 662.

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 reaches the position of the slot 711, the tension force 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, and the arithmetic control circuit 810 can automatically receive a template machining command.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view with one end cut away showing the mechanical part of the 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 section, 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 section and the sensor section, 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, FIG. 9C is a schematic diagram showing the relationship between right eye lens frame data and left eye lens frame data, and FIGS. 10A and B are diagrams showing an 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 X-X' in FIG. 11,
13A to 13C 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. , FIG. 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, Figures 21A and B, and Figures 23A and B are schematic diagrams showing the operation of the lens measuring device, Figure 19 is a schematic diagram showing the relationship between the A and B lens curves and edge thickness, and Figure 20. and FIG. 22 are diagrams showing the relationship between the carriage and the abutting member. 1... Device housing, 2... Carriage, 3... Grindstone, 28a, 28b... Lens rotation axis, 200...
...Frame shape measuring device, 300...Measurement section, 6
01... Base frame, 603... Moving base, 61
0...Moving frame, 620...Lens radius sensor, 623...Hand arm, 624...Oval piece, 625...Contact ring, 631,632...Moving stage, 651,653...Feeler, 8
10...Arithmetic control circuit, 680...Aperture, 681
...Blocking plate, 682...O ring, 683...
Ring, 686, 687...protrusion.

Claims (1)

[Claims for Utility Model Registration] (1) A lens rotation shaft having a lens rotation shaft for holding and rotating a lens to be processed, a grindstone for grinding the lens to be processed, and a lens rotation shaft for rotating the lens to be processed; The lens processing chamber includes a lens processing chamber in which the sandwiched lens to be processed and the grindstone are arranged to grind the lens to be processed, and a control unit for causing the lens to be processed to be ground by the grindstone. A lens grinding apparatus comprising: at least one feeler for contacting the lens to be processed, which is provided in a feeler storage section adjacent to the lens processing chamber; a moving mechanism disposed within the filler housing for moving the filler with respect to the lens; and a shielding member that opens and closes to cover the opening by the control unit in response to the movement of the filler by the moving mechanism. 1. A lens grinding apparatus comprising: a lens shape measuring means for detecting the amount of movement of the feeler and measuring the shape of the lens to be processed. (2) The lens shape measuring means includes a first feeler that comes into contact with the edge surface of the unprocessed lens or the bevel apex of the processed lens after bevel processing, and a first feeler that detects the amount of movement of the first feeler. 1
a detection means, a second feeler that can come into contact with the front refracting surface of the unprocessed lens, a second detection means for detecting the amount of movement of the second feeler, and a rear refractive surface of the unprocessed lens. The lens grinding device according to claim (1) of the utility model registration, characterized in that it is comprised of a third feeler that can come into contact with the third feeler, and third detection means that detects the amount of movement of the third feeler.