JPH0622794B2 - Lens grinding machine - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens grinding device for grinding a raw spectacle lens for framing a spectacle frame.

2. Description of the Related Art A conventional lens grinding device is disclosed in Japanese Patent Laid-Open No. 61-1560.
No. 22, which is disclosed in Japanese Patent Laid-Open No. 22 and in which an arithmetic unit corresponds to each rotation angle θ of a contact having a rotation center O ₁ as a rotation center (a distance between the rotation center O ₁ and a lens-shaped inner groove). The geometrical center point M of the target lens shape, the inner diameter P from the geometrical center point M to the inner groove of the target lens shape, and the optical centering point O are sequentially calculated.
₂ , the inner diameter Q from the optical centering point O ₂ to the inner groove of the lens,
It is known that the beveling of the lens is performed automatically and precisely by obtaining the bevel value and controlling the moving mechanism based on these calculated values. In particular, when the optical centering point O ₂ is calculated by the arithmetic unit, the pupil distance PD or 1/2 thereof and a predetermined value PA are input from the operation switch to determine the optical centering point O ₂ . is doing.

(Problems to be Solved by the Invention) In the conventional lens grinding apparatus described above, the rotation center O ₁
Inner diameter R corresponding to each rotation angle θ of the contact centered around
(Distance between the rotation center O ₁ and the inner groove of the target lens shape) is stored. The measured values are coordinate conversion with the geometric center point M of the inner groove of the target lens as the coordinate center, coordinate conversion with the point O ₁ coincident with the optical center point O in the X coordinate as the coordinate center, and the optical center point in the Y coordinate. Coordinate conversion is performed with the point O ₂ coinciding with O as the coordinate center.

Further, it does not disclose means for inputting the geometric center-to-center distance FPD value, and of course does not disclose its display means.

However, the geometric center distance FPD value of the spectacle frame is absolutely necessary data for performing appropriate lens grinding, and it is necessary to be able to input it easily and surely.

Further, the geometrical center distance FPD and the pupillary optical center distance PD are important values for performing accurate lens grinding, and it is necessary to effectively prevent the forgetting of the input and the input error. The lens grinding machine has no effective means for this.

The present invention has been made in view of these problems of the conventional lens grinding apparatus, and it is possible to measure and calculate the data necessary for lens grinding with high accuracy, and the lens input by the grinding operator. An object of the present invention is to provide a lens grinding device provided with a means for displaying data necessary for grinding so that the data can be always checked.

(Structure of the Invention) The present invention relates to a carriage moving means for moving a carriage for changing an axial distance between a lens rotation axis and a grindstone rotation axis, and a lens of an eyeglass frame in which a lens to be processed is framed. Lens frame shape data input means for inputting the digital shape data (ρ _n , θ _n ) of the frame, a distance FPD value between geometrical centers of both lens frames of the spectacle frame, an amount U of upper alignment and spectacles FPD / U / PD for inputting the PD value of the distance between the optical centers of the pupils of the wearer's eyes
Value input means and FPD / U / PD FPD input by the value input means
Display means for displaying a U / PD value, the digital shape data (ρ _n , θ _n ), the FPD
Means for aligning the origin of the lens frame shape data input means with the optical center of the pupil calculated based on the value, the U value and the PD value, and new digital shape data ( _s ρ) obtained by the lens frame shape data input means. _n , _s θ _n ) radial angle information _s
a lens rotating shaft control means for controlling the amount of rotation of the lens rotating shaft on the basis of the theta _n, movement of the new digital shape data obtained by the lens frame shape data input means _{(s ρ n, s θ n} ) Diameter information _s ρ
and a carriage control means for controlling the movement of the carriage based on _n , and grinds the lens to be processed.

(Effect of the Invention) According to the present invention configured as described above, since data necessary for lens grinding is subjected to coordinate conversion only once, highly accurate measurement and calculation can be performed without accumulating errors. In addition, the data necessary for lens grinding input by the grinding operator can always be confirmed, an opportunity to correct incorrect input data is given to prevent errors, and proper lens grinding can be performed.

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

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

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

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

Pulleys 26a and 26b are attached to the lens rotation shafts 28a and 28b, respectively.
Drive shaft 2 having pulleys 23a, 23b at both ends
5 is built in. A worm wheel 22 is attached to one end of the drive shaft 25, and meshes with a worm gear 21a attached to the rotation shaft of a lens shaft rotation motor 21 which is a pulse motor. A timing belt 24a2 is provided between the pulleys 23a and 23b and the pulleys 26a and 26b.
4b is crossed over. With these configurations, the motor 2
The rotation of 1 is converted into the rotation of the lens rotation shafts 28a and 28b, and the lens LE to be processed is rotated. On the other hand, a lens measuring device 600 described later is built in the carriage 2.

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

FIG. 2 is a sectional view of the frame 4 in FIG. 1 taken along the line II-II ′. The stopper device 42 is a stopper stopper vertical motor 420 that is a pulse motor disposed on the lower surface of the frame 4.
And a column 421 and a stopper member 422. The feed screw 423 attached to the rotating shaft of the motor 420 is screwed with the female screw portion 424 of the support column 421.
A key 425 is planted on the side surface of the support column 421, and the key 425 is fitted into the key groove 44 formed in the frame 4.

A photo sensor unit 427 is attached to the table portion 426 at the upper end of the column 421. Stop member 4
22 is attached to the table portion 426 by a shaft 428 rotatably fitted into the end portion of the table portion 426 so as to be rotatable about the shaft 428. A spring 470 is inserted between the contact-preventing member 422 and the table portion 426, and the action of the spring 470 causes the contact-preventing member 42.
2 is always lifted from above as shown by the chain double-dashed line.

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

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

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

The supporting device section 200A has a housing 201. Case 201
Has feet 253, 254, and these feet 253, 254
Is a rail 25 attached to the housing 1 of the lens grinding machine
It is slidably mounted on 1, 252. Again door 1
0a has rails 255 and 256, and when the door 10a is opened, each of the rails 255 and 256 has a rail 2
It is configured to be located on the extension line of 51, 252. With this configuration, the operator can slide the housing 201 out of the apparatus housing 1 as necessary.

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

Both side flanges 207a and 207b of the moving stage 203
A guide shaft 208 is provided in parallel with the Y-axis direction of the measurement coordinate system, and the guide shaft 208 has a flange 207a.
A guide shaft motor 209 attached to the motor is configured to rotate. A single guide groove 210 is formed on the outer surface of the guide shaft 208 in parallel with the shaft. Hands 211 and 212 are slidably supported by the guide shaft 208. The shaft holes 213 of the hands 211 and 212,
Projections 213a and 214a are formed on 214, respectively, and these projections 213a and 214a are engaged with the guide groove 210 of the guide shaft 208 described above, and the hand 21
The rotation around the guide shaft 208 of 1, 212 is blocked.

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

An arm 241 having a contact wheel 242 at one end is attached to the hand 212 so as to be rotatable around the other end.
The arm 241 is always in contact with the micro switch 244 by the spring 243. These contact wheels 242,
The arm 241, the spring 243, and the micro switch 244 configure 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.
A Y-axis motor 224, which is a pulse motor having a pulley 223, is attached to the other end of 1. A mini-chia belt 226 with a spring 225 interposed is wound around the pulleys 223 and 224, and both ends of the mini-chia belt 226 are pins 2 planted on the upper surface of the hand 211.
It is fixed to 27. On the other hand, a flange 228 is formed on the upper surface of the hand 212, and the flange 228 is configured to come into contact with the side surface of the pin 229 planted on the rear flange 221 of the moving stage 203 by the movement of the hand 212. ing.

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

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

FIG. 6 shows the structure of the spring device 315. An electromagnetic magnet 318 is provided in a casing 317 attached to the base 310 of the sensor arm portion 302, and a slide shaft 319 is fitted in a shaft hole of the magnet 318 so as to be slidable in the axial direction. The slide shaft 319 has flanges 320 and 321. A viscosity 323 is present between the flange 320 and the wall of the casing 317, and the spring 32
3, the slide shaft 319 is always moved to the left in FIG. Clutch plates 324 and 325 are rotatably supported at the ends of the slide shaft 319, and one end of a constant torque spring 316 is fixed to one clutch plate 324. A spring 326 fitted with a slide shaft 319 is interposed between the 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. . Further, a washer 327 is attached to the end of the slide shaft 319.

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

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

Next, the structure of the frame holding device section 100 will be described with reference to FIGS. 4 (A) and 5. Side 15 of fixed base 150
Frame holding rods 152, 152 are screwed to the centers of both side flanges 151, 151 having 1a, 151a. Further, inverted U-shaped bridges 151b and 151c are fixed to the flanges 151 and 151. The bridges 151b and 151c are used to hold the holding device 100 in the hand 2
It is provided to abut the shoulders of the notches 215a and 217a of the hand to prevent the holding device from being inserted when the insertion is made between 11, 212 when the direction is not the proper direction. Bottom plate 150a of fixed base 150 and flange 151
Movable base 15 having sides 153a, 153a between
3 is inserted, and the movable base 153 is the fixed base 1.
Two leaf springs 15 attached to the bottom plate 150a of the 50
4, 154.

The movable base 153 has two parallel guide grooves 155, 1
55 is formed, and as shown in FIG. 5, the guide groove 1
55, 155 and sliders 156, 156 of the projecting legs 156.
a and 156a are engaged, the sliders 156 and 156 are engaged.
Is slidably mounted on the movable base 153. On the other hand, a circular opening 157 is formed in the center of the movable base 153, and a ring 158 is rotatably fitted on the outer periphery of the circular opening 157. Two pins 15 are provided on the upper surface of the ring 158.
9, 159 are planted, and each of the pins 159, 159 has a stepped portion 156b of the slider 156, 156,
It is inserted into a slot 156c formed in 56b.

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

Next, FIG. 4 (B), (C) and FIG. 7 (A), (B)
The operation of the frame shape measuring apparatus described above will be described based on FIG. First, as shown in FIG. 4 (B), the slider 15
6, fingers are inserted into the holes 156e, 156e of the sliders 156, 156 so that the sliders 156, 156 are sufficiently spaced apart from each other and pressed downward.
4, a sufficient distance is provided between the holding rod 152 and the stepped portions 156b and 156b of the sliders 156 and 156 against the resilience of the sliders 154 and 154. After that, the spectacle frame 50
The lens frame 501 to be measured 0 is inserted, and the upper and lower rims of the lens frame 501 have sliders 156, 15
The distance between the sliders 156 and 156 is narrowed so that the sliders 156 and 156 come into contact with the inner wall. In this embodiment, the slider 15
As described above, since 6, 156 have the connecting structure by the ring 158, the amount of movement of one of the sliders 156, 156 is equal to the amount of movement of the other slider.

Next, the holding bar 15 is located approximately in the center of the upper rim of the lens frame 501.
After sliding the frame 500 so as to be below 2, the movable base 153 is repulsed by the leaf springs 154 and 154 when the operator releases his or her hand from the sliders 156 and 156. The lens frame 50 is raised by the force.
1 is the stepped portions 156b and 156b and the holding rods 152 and 152.
And the frame 500 holds the lens frame 50.
It is held so that the substantially geometrical center point of 1 and the center point 157a of the circular opening 157 of the frame holding device 100 substantially coincide with each other. 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 side 153 of the movable base 153.
The distance d to a is configured to have the same value.

Next, as shown in FIG. 7 (A), the frame holding device unit 100 holding the frame 500 in this way, as shown in FIG.
Insert between 212. At the same time, the left and right eye determination device 2
When the contact wheel 242 is abutted by the frame 500 and the arm 241 is rotated, the micro switch 40
The contact No. 4 is turned off. Accordingly, the determination device 240 automatically determines that the measured lens frame 501 is for the left eye. Next, the Y-axis motor 224 is rotated by a predetermined angle. The mini-chia belt 226 is driven by the rotation of the Y-axis motor 244, the hand 211 is moved leftward by a certain amount, the frame holding device section 100 and the hand 212 are also induced to move leftward, and the collar 228 is disengaged from the pin 229. At the same time, the frame holding device section 100 is held between the hands 211 and 212 by the tension spring 230. At this time, the sides 151a and 152a of the flange 151 of the fixed base 150 of the frame holding device section 100 are respectively formed by the slope 2 of the hand 211.
15 and the slope 217 of the hand 212, and both sides 153a and 153a of the movable base 153 contact the slope 216 of the hand 211 and the slope 218 of the hand 212, respectively.

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

Next, the frame holding device section 100 is swung to the position shown by the chain double-dashed line in FIG. 7 (A) by the rotation of the guide shaft rotation motor 209 at a predetermined angle, and this reference plane S is determined by the bevel feeler 356 of the measuring section 300. Stop on the same plane as the initial position.

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

Then, the motor 301 is rotated every predetermined number of unit rotation pulses. At this time, the sensor head portion 312 moves on the rails 311 and 311 according to the shape of the spectacle frame 500, that is, the radius vector of the lens frame 501, and the movement amount is read by the magnetic scale 314 and the reading head 313.

From the rotation angle θ of the motor 301 and the reading amount ρ from the reading head 313, the lens frame shape is (ρ _n , θ _n ) (n
= 1, 2, 3, ... N). here,
As described above, in the first measurement, as shown in FIG. 9 (A), the center O of the rotation shaft 304 is measured so as to substantially coincide with the geometric center of the lens frame 501. Therefore, the second measurement is the first measurement data (ρ _n ,
theta _n) polar - data after converting Cartesian coordinates _(X n,
Y _n ) to be measured point B (x _b , which has the maximum value in the X-axis direction,
y _b ), the measured point D (x _d , y having the minimum value in the X-axis direction
_d ), the measured point A (x _a , which has the maximum value in the Y-axis direction,
y _a) and Y the measurement point having the minimum value in the axial direction C _(x c,
y _c ) and select the geometric center point O _o of the lens frame Frame 500 that is schematically input in FIG. 9B and is input in advance from the keyboard 1000 described later.
From the distance FPD between the geometrical centers of both lens frames and the distance PD between the pupils of the wearer's eyes, (FPD-PD) / 2 = I is obtained to obtain the inward displacement amount I, and the upward displacement amount U from the keyboard 1000 is also calculated. Is the pupil position of the wearing eye, that is, the position O _s ( _s X _o , _s Y _o ) at which the optical center of the lens to be processed should be located. Ask as. Based on these _s X _o and _s Y _o values, the X-axis motor 206 and the Y-axis motor 224 are driven, and the hand 2
The frame holding device unit 100 sandwiched between the lens holders 11 and 212 is moved, whereby the pupil center position O _s of the lens frame 501 is moved.
With the rotation center O of the sensor arm 302, the lens frame shape is measured again, and the measured values ( _s ρ _n , _s θ _n ) at the pupil center position O _s (n = 1, 2, 3, ..., N)
Ask for.

In the above-described radial measurement of the lens frame 501, if the bevel feeler 356 sometimes comes off from the lens frame 501 during measurement, the radial measurement data is changed as shown by e in FIG. 9 (A). Since it greatly deviates from the immediately preceding measurement data, the radius vector change range a is defined in advance, and when deviating from the range, the rotation of the sensor arm portion 302 stops, and at the same time, the electromagnetic magnet of the spring device 315 shown in FIG. 318 is excited and the collar 321 is attached. As a result, the clutch plates 324 and 325 sandwich the constant torque spring 316 and prevent the winding action thereof, so that it is possible to prevent the arm 355 of the sensor head portion 312 from being caught in the lens frame and scratching the eyeglass frame 500. After the feeler 356 is dislocated in this way, the eyeglass frame 500 is returned to the initial measurement position again and measurement is performed again. If the bevel feeler 356 does not come off the frame 500, the door 10a (first
(See FIG. 3), the casing 201 can be pulled out, so that the operator can easily remove the feeler.

Lens Measuring Device Next, a lens measuring device for detecting the radius vector, edge thickness, curve value, etc. of the lens to be processed built in the carriage 2 will be described with reference to FIGS. 11 to 13C. explain. Two parallel guide rails 602 and 602 are provided on a base frame 601, and a movable base 603 is slidably arranged on the rails 602. Mobile stand 6
A feed screw 604 is screwed onto 03, and the feed screw 604 is driven by a lens radius sensor sliding motor 605 composed of a pulse motor.

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

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

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

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

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

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

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

The feeler arm 6 is provided at the front end of the free stage 638.
50 is attached, and the tip end thereof is stretched in parallel with the axis A of the arm 621 of the lens radius sensor 620. A feeler 651 is rotatably supported by a bent portion of a tip end of the feeler arm 650. The contact peripheral edge 651a of the feeler 651 coincides with the ridgeline of the contact wheel 625, that is, the rotation axis O ₁ of the oval piece 624. Similarly, a feeler arm 652 is attached to the front end portion of the free stage 634, and a feeler 653 is rotatably attached to the tip bending portion thereof.

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

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

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

When the lens rotation shaft 28 is rotated in the direction of arrow 684 in order to measure the lens radius, etc., the ring 683 is also rotated simultaneously with the blocking plate 681 by the frictional force of the O-ring 682 to release the blocking of the opening 680. When rotated, the shielding plate 681 abuts the protrusion 686 formed on the carriage 2 and is prevented from further rotation. After that, the lens LE can be rotated by rotating only the lens rotation shaft 28 against the frictional force of the O-ring 682. Conversely, when the lens rotation shaft 28 is rotated in the direction of arrow 685 during lens grinding, the blocking plate 681 is simultaneously rotated and the aperture 680 is opened again.
Is blocked, and the protrusion 687 formed on the carriage 2 is abutted to prevent subsequent rotation, so that the opening 680 continues to be blocked.

Electric Control System Based on FIG. 14, the structure of the electric control system of this embodiment having the above-mentioned mechanical structure will be described with a block diagram. The encoder 625 of the lens radius sensor 620 and the encoders 661 and 662 of the lens surface shape sensor are connected to counter circuits 820, 821 and 823, respectively. The detection output from each encoder is the counter circuit 820, 82.
1, 823, and the result is calculated by the arithmetic control circuit 810.
Is input to. Further, the photo sensor unit 427 and the micro switches 641, 642 and 244 are also connected to the arithmetic control circuit 810.

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

The arithmetic control circuit 810 is composed of, for example, a microprocessor, and its control is controlled by a sequence program stored in the program memory 814. The arithmetic control circuit 810 includes an input device 2000 and a display device 10 which will be described later.
00 is connected. Further, the measurement data of the lens, which has been arithmetically processed by the arithmetic control circuit 810, is transferred to and stored in the lens data memory 827. The arithmetic control circuit 810 also controls the frame shape measuring device system 800.

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

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

Input Device and Display Device As shown in FIG. 16A, the input device and the display device of this embodiment are composed of sheet switches, and include a main switch 2100, a function key 2200, an input switch group 2303, and System start switch 2
401, 2402 and a stop switch 2500 for temporarily stopping driving. Here, a function key 2200 is a pump switch 2201 for supplying only grinding water; a grindstone switch 2202 for rotating only a grindstone; a handrail switch 2203 for instructing the supply of grinding water for rotation of a grindstone for handrail processing. A machining type selection switch 2204 for selecting either a direct machining process in which the lens frame shape of the frame is measured and machining based on this or a copying process using a template; an automatic manual selection switch 2205; a frame shape Binocular-monocular selection switch 2206 for selecting whether to measure the lens frame shape of only one eye of the frame or the shape of the lens frame of both eyes with the measuring device; horizontal between the pupil and the frame geometric center When inputting the directional positional relationship, whether PD and FPD are input or the relative amount (shift amount) is input Selection switch for-option 2207; grinding pressure intensity changeover switch 2208; and either the beveling when the mold plate machining, a selection switch for selecting whether to TairaTadashi machining 2209
Consists of. The input switch group 2303 includes a ten-key input switch 2300, a ten-key input cancel switch 2301 and a memory switch 2302 for storing the input. By the way, the operating states of these switches are displayed by turning on the pilot lamps 2600 provided for the respective switches.

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

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

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

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

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

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

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

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

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

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

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

Step 2-5: The operator inputs the PD value of the wearer according to the prescription with the ten-key switch 2300, and presses the memory switch 2302 after the input is completed. The arithmetic control circuit 810 temporarily stores the data in the internal memory and displays the input data on the “PD” display section 1101 of the display. next,
The operator inputs the FPD value with the ten-key switch 2300, and presses the memory switch 2302 after the input is completed. The arithmetic control circuit 810 temporarily stores the data in the internal memory, and displays the input data on the “FPD” display unit 1102 of the display 1100 via the controller 1400.

Then, the operator determines the amount of upward displacement U of the optical center of the lens LE.
(See FIG. 9 (B)) is input with the ten-key switch 2300, and after the input is completed, the memory switch 2302 is pressed. As a result, the arithmetic control circuit 810 stores the input data and stores the “UP” display portion 110 of the display 1100.
Display in 3. However, in step 1-5 above
When is selected, the relative amount (approach amount) of PD and FPD is input with the ten-key switch.

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

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

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

Step 2-9: The arithmetic and control circuit 810 determines the obtained O _s (X _s , Y _s ).
Based on the frame shape measuring device drivers 801 and 80
3 drives the Y-axis motor 224 and the X-axis motor 206 to move the right-eye lens frame of the frame 500 so that the rotation center of the sensor arm 302 coincides with O _s (X _s , Y _s ). To do.

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

Step 3-1: The arithmetic control circuit 810 rotates the lens rotation shaft motor 21 via the motor controller 824 to rotate the lens rotation shaft 28.
Is rotated in the direction of arrow 684. As a result, the shielding plate 68
Unblock the opening 680 of No. 1 Then, the arithmetic control circuit 8
Reference numeral 10 denotes lens frame data ( _rs ρ _n , _rs θ _n ) based on the main measurement stored in the lens frame data memory 811.
Of the (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 radial value is set to the lens radial sensor motor 605.
_The pulse number corresponding to _rs ρ ₁ is supplied from the pulse generator 809, and the moving frame 610 is moved to the raw lens LE side. As the moving frame 610 advances, the arm 621 of the lens radius sensor 620 also moves the constant torque spring 61.
The contact wheel 625 comes into contact with the edge surface of the unprocessed lens LE by moving forward by the tensile force of No. 4. The movement position of the arm at this time is detected by the encoder 615, and the counter 82
0 is counted, and the count value is _{rs in the} arithmetic control circuit 810.
It is calculated as the radius vector (radius) R ₁ of the lens LE on the θ ₁ radius line, and (R ₁ ,
_rs θ ₁ ) (FIG. 18 (B)).

Next, the feeler motor 637 is rotated to move the mover stages 631 and 632.
7, when the pin 640 of the moving stage 632 turns on the micro switch 642, its rotation is stopped via the arithmetic control circuit 810 and the motor controller 824. By the movement of the moving stages 631 and 632, the free stages 633 and 634 connected to them by the springs 635 and 636 slide on the rails 630 and 630. As a result, the feelers 651 and 653 contact the front surface and the rear surface of the lens, respectively, at the position of the radial value _rs ρ ₁ .
The positions of the feelers 651 and 653 at this time are detected by the encoders 661 and 662, respectively, and the counter 82
1, the count value to the arithmetic control circuit 810 via 822.
_f Z ₁ and _b Z ₁ are input, and the arithmetic control circuit 810 transfers them to the lens data memory 827 and stores them.

Hereinafter, similarly radius vector _rs theta lens in _N radius _R N,
The feeler positions _f Z _N and _b Z _N are calculated, and all the 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 to be stored. As a result, the feelers 651 and 653 are the first
As shown in FIG. 8B, the lens frame radius vector information ( _rs ρ _n ,
_rs θ _n ) will be traced as a locus T on the unprocessed lens LE.

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

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

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

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

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

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

Step 3-7: When the operator inputs “manual” in the previous step 1-2, the arithmetic control circuit 810 causes the liquid crystal display 1100 of the display device 1000 to display the characters “curve” as shown in FIG. 16 (B). Also, the "approach amount" is displayed, and the operator is prompted to input each desired numerical value. The operator is the numeric keyboard 23
Operate 00 to input the desired curve value. The input data is displayed in the "curve" column of the liquid crystal display 1100, and the operator confirms the input data and then the "memorize" switch 2302.
Press to store the input data in the internal memory of the arithmetic control circuit 810. Next, the operator presses the "close" switch of the switch 2207 and then inputs the desired close amount of the bevel apex obtained in the previous steps 3-5 and 3-6 by operating the ten-key switch 2300 in millimeter units. . The input data is displayed in the “close” display section 11 of the liquid crystal display 1100.
12 is displayed.

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

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

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

Step 4-1 The arithmetic control circuit 810 determines from which start switch the signal is received in Step 2-6. In the case of a command from the “G start” side selection switch 2401,
Go to the next step 4-2, "P start" side selection switch 2
If the command is from 402, the process proceeds to step 4-3.

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

Next, the arithmetic control circuit 810 turns on the switch circuit 825.
Then, the grindstone motor 5 is rotated. Arithmetic control circuit 810
Next, based on the radius vector _rs ρ _max , the contact stop motor 420
The horizontal cut surface 422b of the stopper member 422.
Is lowered to the height of the distance d _max from the grindstone surface of the rough grindstone 3a. Here, d _max is the maximum lens frame radius vector _rs ρ
_max has a relationship with the radius r of the ring 27a and d _max = _rs ρ _max -r (9).

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

Subsequently, the arithmetic control circuit 810 causes the lens frame data memory 81
The data of ( _rs ρ ₁ , _rs θ ₁ ) from ₁ is read,
_The lens rotation shaft motor 21 is rotationally controlled based on the data of _rs θ ₁ , and the lens LE to be processed is rotated. next,
_A stop motor 420 based on the radial data of _rs ρ ₁
Is controlled to lower the stopper member 422 to the height of d ₁ . As shown in FIG. 20, generally, the stopper member 42 is
The height d _{i of} 2 is the relationship between the radial _rs ρ _i and the ring r.
As obtained from the equation (8), it is obtained as d _i = _rs ρ _i −r (i = 1,2,3, ..., N) (8) ′.

The lens LE to be inspected is further roughly ground by the lowering of the contact stop member 422, and when the lens LE is ground to the radius vector of _rs ρ _i , the photo sensor unit 427 inputs the cutoff signal to the arithmetic control circuit 810 again. Upon receiving the signal, the arithmetic control circuit 810 reads ( _rs ρ ₂ , _rs θ ₂ ) from the lens frame data memory 811 as data, and outputs _rs
The lens LE is rotated to an angle of θ _{2, and} the contact stop member 422 is lowered to the height d ₂ based on _rs ρ ₂ , and the lens LE is
To grind. Thereafter, similarly, the lens LE is ground to ( _rs ρ _N , _rs θ _N ) to obtain the lens LE to be processed.
Is ground into a shape of lens frame data ( _rs ρ _i , _rs θ _i ).

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

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

Next, the arithmetic control circuit 810 uses the lens frame data memory 81.
1 to the lens frame radius vector information ( _rs ρ _i , _rs θ _i ) (i =
1, 2, 3, ... N) are sequentially read, and corresponding bevel position information _e Z from the lens data memory 827.
_i is sequentially read, and the lens rotary shaft motor 21, the contact stop motor 420, and the carriage movement motor 60 are controlled based on these data to perform rough grinding on the lens, and the bevel grindstone 3b.
The beveling is done with.

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

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

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

Step _{4-7: rs} ρ _i than _{rs θ i} when 'is large, the abutting stopping member 4
The height d _{i of} 22 is lowered by a small amount and the process returns to step 4-4 to perform the beveling.

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

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

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

Step 6-3: When step 1-4 is the one-eye measurement command, the arithmetic control circuit 8
In step 10, the right eye lens frame measurement data ( _rs ρ _n , _rs θ _n ) obtained in step 2-6 is transformed into polar coordinates and Cartesian coordinates, and then the Cartesian coordinates data ( _rs X _i , _rs Y _i ) (i).
= 1, 2, 3, ..., N) As new lens frame shape data ( _s X _i ,
_s Y _i ). The data of _X s -Y _s coordinates the optical center _{O s'} as the origin as shown in Figure No. 9 (C) _{Y s}
The lens frame shape of the right eye is inverted with the axis as the axis of symmetry, and this is again subjected to rectangular coordinate-polar coordinate conversion ( _s ρ _n ,
_s θ _n ) is stored in the lens frame data memory 811 as the lens frame shape of the left eye.

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

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

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

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

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

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

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

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

Step 5-8: The arithmetic control circuit 810 rotates the lens rotation shaft 28 by rotating the motor 21 to open the opening 680, and as shown in FIGS. 23 (A) and 23 (B), the lens radius sensor. The motor 605 is controlled to move the moving frame forward, and the pulling force of the constant torque spring 614 brings the contact ring 625 into contact with the edge of the rough-ground lens LE. Encoder 6
15 is a machining radius _i of the lens LE (i = 1, 2, 3, ...
, N) is measured and the data is input to the arithmetic control circuit 810 via the counter 820. The arithmetic control circuit 810 also reduces the radial measurement value _i by a predetermined amount α ( _i −
The motor 605 is controlled so that the fillers 651 and 653 come to the position α), and the motor 637 is controlled to set the free stages 633 and 634 in the free state, and the feelers 651 and 653 are used to position the front surface of the rough-ground lens LE. _{f i} and the rear surface position _{b i} are set to encoders 661 and 66.
Measure at 2.

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

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

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

A bearing 710 is attached to the arm 34 of the carriage. The bearing 710 has a slot 711 along its length.
Are formed. A stopper lever 712 is fixed to one end of the bearing 710, and a shaft 714 having a tapered portion 713 formed at the other end is rotatably fitted and inserted. Axis 71
A pin 715 is planted on the outer periphery of the No. 4 connector. This pin 7
Reference numeral 15 is always in contact with the end surface of the bearing to prevent the shaft 714 from moving in the axial direction. At the end of the shaft 714, the shaft 7
A spring 718 for constantly pulling 14 in the direction of arrow 716 in FIG. This spring 718 is arrow 7
Since it is twisted in the direction of 16, the force for rotating the shaft 714 in the direction opposite to the arrow 717 is applied.
The contact wheel 720a of the microswitch 720 is in contact with the tapered portion 713. The micro switch 720 is connected to the arithmetic control circuit 810.

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

Next, the operation of this embodiment will be described. When processing the template, the operator attaches the template SP to the template holding pin of the lens rotation shaft 28 of the carriage 2. Next, the stopper lever 71
2 is rotated clockwise in FIG. 10 (B) until the notch 712a abuts the central pin 28a. When the pin 715 comes to the position of the slot 711, the spring 7
A pulling force of 18 causes shaft 714 to move in the direction of arrow 716. By the movement of the shaft 714, the micro switch 720 is turned on by the taper portion 713, and the arithmetic control circuit 810 can automatically receive the command for the template processing.

[Brief description of drawings]

FIG. 1 is an external perspective view showing a mechanical portion of a lens grinding apparatus according to the present invention with one end cut away, FIG. 2 is a sectional view taken along line II-II ′ of FIG. 1, and FIG. 3 is an external perspective view of a frame shape measuring apparatus. FIG. 4 (A) is a perspective view of the frame holding device section, FIGS. 4 (B) and 4 (C) are explanatory views showing the operation thereof, and FIG. 5 is a vertical midline sectional view of the frame holding device section. FIG. 6 is a vertical median cross-sectional view showing the structure of the spring member, FIG. 7 (A) is a schematic view showing the relationship between the supporting device portion and the sensor portion, FIG. FIG. 9 (A) is a schematic view showing the relationship between the geometrical center and the optical center of the measured value of the lens frame, and FIG. 9 (B) is the relationship between the frames PD and PD. FIG. 9 (C) is a schematic diagram showing the relationship between right-eye lens frame data and left-eye lens frame data, FIG. 10 (A), FIG. 11B is a diagram showing an automatic detection device for template processing, FIG. 11 is a plan view of a lens measuring device, FIG.
2 is a sectional view taken along the line XII-XII 'in FIG. 11, FIGS. 13 (A) to 13 (C) are views showing the structure and action of the tip of the lens radius sensor, and FIG. Block Diagram,
FIG. 15 is a block diagram showing an electric system of the frame shape measuring device, FIG. 16 (A) is a diagram showing a display device and an input device,
16B is a diagram showing another display example of the display device, FIG.
FIG. 7 is a flow chart showing the operation sequence of the present invention,
18 (A), (B), FIG. 21 (A), (B), FIG. 23 (A), and (B) are schematic diagrams for showing the operation of the lens measuring device, and FIG. 19 (A). ) And (B) are schematic views showing the relationship between the lens curve and the edge thickness, and FIGS. 20 and 22 are views showing the relationship between the carriage and the stopper member. 1 ... Device housing, 2 ... Carriage, 3 ... Grindstone, 10
a ... door, 28a, 28b ... lens rotation axis, 100
...... Frame holding device section, 201 ...... Case, 202a,
202b ... guide rail, 203 ... moving stage,
210 ... Guide shaft, 211, 212 ... Hand, 24
0 ... Left / right eye determination device, 302 ... Sensor arm part,
312 ... Sensor head part, 352 ... Sensor shaft,
354 ... Notch surface, 356 ... Beak feeler, 8
10 ... Arithmetic control circuit.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasuo Suzuki No. 75-1 Hasunumacho, Itabashi-ku, Tokyo Within Tokyo Optical Machinery Co., Ltd. (72) Yoshiyuki Hatano No. 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Tokyo Optics Machine Co., Ltd. (72) Inventor Hiroaki Ogushi 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Tokyo Optical Machine Co., Ltd. (56) Reference JP 61-156022 (JP, A) JP-B 55- 46818 (JP, B2)

Claims (2)

[Claims] 1. A carriage moving means for moving a carriage for changing an axial distance between a lens rotation axis and a grindstone rotation axis, and a digital shape of a lens frame of an eyeglass frame in which a lens to be processed is framed. A lens frame shape data input means for inputting data (ρ _n , θ _n ), a distance FPD value between geometrical centers of both lens frames of the spectacle frame, an upper shift amount U value, and an eyeglass wearer's eye FPD / U / PD for inputting the PD value of the distance between the optical centers of the pupils
Value input means and FPD / U / PD FPD input by the value input means
Display means for displaying a U / PD value, the digital shape data (ρ _n , θ _n ), the FPD
Means for aligning the origin of the lens frame shape data input means with the optical center of the pupil calculated based on the value, the U value and the PD value, and new digital shape data ( _s ρ) obtained by the lens frame shape data input means. _n , _s θ _n ) radial angle information _s
a lens rotating shaft control means for controlling the amount of rotation of the lens rotating shaft on the basis of the theta _n, movement of the new digital shape data obtained by the lens frame shape data input means _{(s ρ n, s θ n} ) Diameter information _s ρ
_a lens control device for controlling the movement of the carriage based on _n , and grinding the lens to be processed. 2. The lens frame shape data input means includes a frame shape measuring device for obtaining the digital shape data (ρ _n , θ _n ) and the new digital shape data ( _s ρ _n , _s θ _n ). The frame shape measuring device has
A detection feeler that abuts the bevel groove of the lens frame, an arm member that movably supports the detection feeler and is rotatably supported on a moving table, and a moving radius of the lens frame that detects the movement amount of the detection feeler. Information ρ _n and _s ρ
A radial vector detecting means for obtaining _n, and a radial angle detecting means for detecting the rotational amount of the arm member to obtain the radial vector information θ _n and _s θ _n of the lens. The lens grinding apparatus according to item (1).