JPH0843072A - Apparatus for measuring shape of lens frame - Google Patents

Abstract

PURPOSE:To provide an apparatus for measuring shape of a lens frame which controls an initial position of a measuring element to eliminate interferences when the measuring element engaged with groove of the lens frame starts measurement. CONSTITUTION:The apparatus is provided with a frame-holding part 100, a measuring element 356 for measuring a shape of a lens frame while in touch with groove of right and left frames of the lens frame held by the holding part 100, a measuring part 300 for supporting the measuring element 356 and detecting the movement of the measuring element 356 thereby to obtain the shape of the lens frame, and controlling members 740 and 743 for controlling an initial position of the measuring element 356 to position of the rotating center of the measuring part 300. The initial position of the measuring element 356 is controlled by the controlling members 740 and 743 to the position of the rotating center of the measuring part 300, so that the measuring element 356 is brought to butt against the groove in a direction of a normal of the lens frame.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for digitally measuring the shape of a lens frame of a spectacle frame or a template processed by copying the shape of the lens frame. The present invention relates to a lens frame shape measuring device suitable for being used together with a ball-sliding machine that grinds according to information related to.

[0002]

2. Description of the Related Art As a lens frame shape measuring device of this type, as shown in FIG. 26, the left and right lens frames 3 of a spectacle frame 2 are provided on a holding surface 1 (measurement reference surface) of a main body of a frame holding device (not shown). , 3 ′ are held by pressing them with a spring-biased holding rod (not shown), and first, in one of the bevel grooves 4 (see FIG. 27 (a)) of the lens frame 3, 3 ′, a soroban ball shape is formed. By moving the feeler 5 (stylus) of the eyeglasses inwardly and detecting the movement trajectory of the feeler 5 three-dimensionally, the shape of the lens frame 3 of the spectacle frame 2 is measured, while the other lens frame is similarly measured. There is a device that measures the shape of 3 '. In the figure, 4a and 4b are inclined surfaces that form the bevel groove 4.

This spectacle frame 2 is shown in FIGS.
It is generally curved as shown in (a). Therefore, with the bridge 6 side connecting the pair of left and right lens frames 3 and 3'of the spectacle frame 2 contacting the holding surface 1 (measurement reference surface), the lens frames 3 and 3'are held (see FIG. Even if it is held on the holding surface 1 by a not shown), the peripheral portion 7 on the side opposite to the nose pad side of the lens frames 3 and 3 ′, that is, the bridge 6 side (see FIG. 26) (the portion where the vine is attached as an ear hook) 27 is held in a “floating” state from the holding surface 1 as shown in FIG. 27A, the holding surface 1 and the lens frame 3 are inclined (frame inclination).

[0004]

[Problems to be Solved by the Invention]
To measure the true size of 3 ′, as shown in FIG. 28, at the start of the shape measurement of the lens frame, the feeler 5 is arranged in the central portion of the lower rim of the right lens frame 3 and is shown by a chain line. Thus, the connecting member 5A to which the feeler 5 is attached is pressed via the spring member so as to always face in the normal direction of the lens frame 3.

However, the connecting member 5A is rotatably provided with a predetermined angular width about the feeler 5 so that the tip of the feeler 5 follows the lens frame 3. Therefore, when the feeler 5 is engaged with the bevel groove of the lens frame 3 to start measurement, the connecting member 5A faces a direction deviated from the rotation center O direction of the rotation base of the measurement unit as shown by the solid line. In such a case, there is a problem in that the supporting member 5B supporting the arm 5A interferes with the lens frame 3 and measurement may not be possible.

Therefore, the present invention has been made in view of the above problems, and an object thereof is to control the initial position of the tracing stylus when the tracing stylus is engaged with the bevel groove of the lens frame to start the measurement. The object is to provide a lens frame shape measuring device that does not cause the above interference.

[0007]

To achieve this object, according to the present invention, there is provided a frame holding means which is attached to an apparatus main body and is capable of holding simultaneously the left and right lens frames of an eyeglass frame, and the frame holding means. For contacting the bevel grooves of the left and right lens frames of the spectacles frame to measure the shape of the lens frame, and for supporting the probe and detecting the movement of the probe to obtain the shape of the lens frame of the spectacles frame. A measuring unit and a tracing stylus control member for controlling the initial position of the tracing stylus with respect to the rotation center position of the measuring unit are provided, and the tracing stylus control member controls the initial position of the tracing stylus with respect to the rotation center position of the measuring unit. It is characterized in that the probe is brought into contact with the bevel groove from the normal direction of the lens frame to obtain the lens frame shape of the spectacle frame.

[0008]

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

[First Embodiment] <Structure> FIG. 1 is a perspective view showing a lens frame shape measuring apparatus according to the present invention. This device is roughly divided into three parts, that is, a frame holding part 100 (frame holding means) that holds the left and right lens frames of the spectacle frame at the same time, and the frame holding part 100 is supported and within the measurement plane of the frame holding part 100. It is composed of a supporting device unit 200 (device main body) that controls transfer to and from the measuring surface and a measuring unit 300 that digitally measures the shape of the lens frame or template of the eyeglass frame. <Frame Holding Unit 100> The frame holding unit 100 has a fixed base 150 as shown in FIGS. 2 to 5. The fixed base 150 has flanges 151 and 151 provided with sides 151a and 151a on both sides.

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

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

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

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

Vertical notches 156d and 156d are formed at the centers of the sliders 156 and 156, and the frame holding rod 1 described above is provided in the notches 156d and 156d.
52 and 152 can be inserted respectively. Also,
Holes 156e and 156e are formed on the upper surfaces of the sliders 156 and 156 so that the operator can easily insert his / her finger when operating the slider. <Supporting Device 200> The supporting device section 200 has guide rails 202a and 202b installed on the housing 201 in parallel with the vertical direction (X-axis direction of the measurement coordinate system). A moving stage 203 is slidably installed on this guide rail,
A female screw portion 204 is formed on the lower surface of the moving stage 203, and the female screw portion 204 has an X-axis feed screw 20.
5 is screwed. The X-axis feed screw 205 is rotated by an X-axis motor 206 which is a pulse motor.

Both side flanges 207 of the moving stage 203
A guide shaft 208 is installed between a and 207b in parallel with the Y-axis direction of the measuring system, and the guide shaft 208 is configured to be rotatable by a guide shaft motor 209 attached to the flange 207a. Guide shaft 208
Has a single guide groove 210 formed on its outer surface parallel to its axis. The horizontal plane including the center line of the guide shaft 208 is the reference measurement surface SO.

Hands 211 and 212 are attached to the guide shaft 208.
Are supported slidably in the longitudinal direction. Hand 21
In the shaft holes 213 and 214 of Nos.
13a and 214a are formed, and the protrusion 213
a and 214a are the guide grooves 210 of the guide shaft 208 described above.
Is engaged in the guide shaft 208 of the hands 211, 212
The rotation around is blocked.

One hand 211 has two slopes 215 and 216 that intersect with each other, and the other hand 212 also has two slopes 217 and 218 that also intersect with each other. The ridge line 220 formed by both slopes 217 and 218 of the hand 212 is parallel to the ridge line 219 formed by the slopes 215 and 216 of the hand 211, and is located in the same plane, and the angle formed by the slopes 217 and 218 and the slope 215. , 21
The angles formed by 6 are the same. Then, between the hands 211 and 212, as shown in FIG.
A spring 230 is stretched around. These ridges 219, 22
A plane including 0 is set as a reference plane S of the frame holding unit 100 (frame holding means, that is, a frame holding device).

With this configuration, the hands 211 and 212
The frame holding device 100 is held between the guide shaft 2 and
By rotating and driving 08 by the guide shaft motor 209, the hands 211 and 212 and the frame holding device 100 are tilted and rotated vertically with respect to the reference measurement surface SO, as shown in FIG. 7.

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

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

<Measuring Unit 300> The measuring unit 300 includes the housing 2
Sensor arm rotation motor 301 attached to the lower surface of 01, sensor arm portion 302 rotatably supported on the upper surface of housing 201, and sensor arm motor 301
The pulley 303 attached to the rotation shaft of the and the rotation shaft 304 of the sensor arm unit 302 (corresponding to the rotation center position)
And a belt 305 stretched around a pulley 303 and a rotating shaft 304. As a result, the rotation of the motor 301 is transmitted to the sensor arm unit 302.

The sensor arm portion 302 has a base 310 having rail holding members 310a and 310b at both ends in the longitudinal direction, and two parallel rails 311 and 311 extending between the rail holding members 310a and 310b.
The sensor head portion 312 moving on the rails 311 and 311 in the longitudinal direction, the magnetic scale reading head 313 attached to one side surface of the sensor head portion 312, and the magnetic scale reading head 313 attached in parallel with the rail 311. It has a magnetic scale 314 for reading and detecting the amount of movement of the sensor head portion 312, and a spring device 315 for constantly pulling the sensor head portion 312 toward the arm end side surface.

As shown in FIG. 8A, the spring device 315 includes a mainspring 316, a casing 317 attached to the rail holding member 310a of the base 310, and an electromagnetic magnet 318 provided in the casing 317.
And a slide shaft 319 that is slidably fitted in the shaft hole of the electromagnetic magnet 318 in the axial direction thereof. The slide shaft 319 extends in a direction orthogonal to the rail 311.

The slide shaft 319 has flanges 320 and 321, and a tension spring 323 is interposed between the flange 320 and the casing 317 to constantly urge the slide shaft 319 to the left. Clutch plates 324 and 325 are rotatably supported at the ends of the slide shaft 319.
A mainspring spring 316 wound around a slide shaft 319 is arranged between 4 and 325.

The mainspring spring 316 has one end fixed to the clutch plate 324 and the other end fixed to the sensor head portion 312, and the sensor head portion 312 is fixed to the rail holding member 310.
It is biased to the a side.

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

The sensor head portion 312 fixes the slider 350 (measuring element support moving base) movably in the longitudinal direction (movable in the horizontal direction) to the rail 311 and the slider 350 at the moving position. As shown in FIG. 9, a slider lock device 720 (see FIGS. 8B and 8C), a tracing stylus holding member 351 held by a slider 350, and a tracing stylus holding member 351 are vertically movable and rotatable. And a measurement support shaft 352 held freely.

The slider lock device 720 is shown in FIG.
As shown in FIG.
2, rotary shaft 723, solenoid 724, spring 72
5, it has a spring support pin 726.

This bracket 721 has a connecting plate portion 721.
a, and support walls 721b and 721b that are integrally provided on both sides of the connecting plate portion 721a and face each other, and are formed in a substantially U shape. Moreover, the connecting plate portion 721a has a fixed plate portion 721 extending in a direction opposite to the supporting wall 721b.
c is integrally formed, and a screw hole 72 is formed in the fixing plate portion 721c.
1d is formed.

The bracket 721 is disposed below the base 310, and a screw 727 penetrating the base 310 is screwed into the screw hole 721d to fix the fixing plate portion 72.
By fixing 1c to the lower surface of the base 310, the base 3
It is fixed at 10. Moreover, the base 310 has a rectangular long hole 728 formed above the space between the support walls 721b and 721b of the bracket 721. The long hole 728 is formed in parallel with the guide rail 311 and is located on the lower surface of the movement locus of the slider 350.

The rotating frame 722 has an upper plate portion 722a.
And a side plate portion 722b extending downward from the upper plate portion 722a is formed in a substantially L shape. Also, the side plate portion 722b
Support plate portions 722c and 722c projecting in the same direction as the upper plate portion 722a are integrally formed at the middle portions on both sides of
A protruding plate portion 722d is integrally formed at the center of the lower edge of the side plate portion 722b. The support plate portions 722c and 722c are rotatably held by the support walls 721b and 721b via a rotary shaft 723.

Spring engaging holes 72 are provided on both sides of the upper plate portion 722a.
2d and 722d are formed and support walls 721b and 721b are formed.
The spring support pin 72
6,726 are fixed by being projected. Then, the spring 725d is attached to the spring locking hole 722d and the spring support pin 726.
Both ends of are locked.

The upper portion of the rotating frame 722 is slightly projected above the base 310 through the elongated hole 728, and the upper plate portion 722a of the rotating frame 722 is made of rubber or the like having a large friction coefficient. A friction locking member 729 is attached.

A solenoid 730 is attached to the lower surface of the base 310 at the base portion so as to be vertically rotatable (not shown in detail), and an actuator 73 of the solenoid 730 is provided.
The tip end of No. 1 is rotatably attached to the projecting plate portion 722d of the rotating frame 722 via a ball joint (not shown).

Moreover, when the solenoid 730 is energized, the actuator 731 is pulled in the direction of arrow 732 against the spring force of the spring 725, and the rotating frame 722 rotates in the direction of arrow 733 around the rotating shaft 723. The friction locking member 72 of the rotating frame 722 is moved.
9 is pressed against the lower surface of the slider 350, and the slider 3
50 is designed to be locked. When the energization of the solenoid 730 is stopped, the rotating frame 722 is rotated in the opposite direction to the above by the spring force of the spring 725, the friction locking member 729 is separated from the slider 350, and the slider 350 is moved. Is the guide rail 31
You can move freely along 1.

The tracing stylus holding member 351 is shown in FIGS.
As shown in FIG. 5, a hollow fixed cylinder member 353 fixed to the slider 350, a cylindrical collar 354 fixed to the inner peripheral surface of the fixed cylinder member 353, an inner peripheral surface of the cylindrical collar 354 and a tracing stylus shaft 362. Is located between the outer peripheral surface of the
A slide cylinder 357 which allows the vertical movement and the rotational movement of the tracing stylus shaft 362 integrally with the tracing stylus 356 mounted on the upper end of 2 via the tracing stylus connecting member 400.
A rack member 358 having the lower end of the fixed cylinder member 353 inserted therethrough.
(Up / down movement interlocking member).

The fixed cylinder member 353 is provided with a flange 353a located on the upper surface of the slider 350 for fixing the fixed cylinder member 353 through a fixing means such as a screw (not shown). Further, a step portion 353b for a stopper that prevents the rack member 358 from moving upward (described later) is formed on the outer peripheral surface of the fixed cylindrical member. Further, the lower portion of the fixing member 353 has a half shape, and a groove portion 353c for directly slidably supporting the lower portion of the tracing stylus shaft 352 is formed below the middle portion of the half portion.

As shown in FIG. 11B, the slide cylinder 357 has an outer peripheral surface of the tracing stylus shaft 352 and a cylindrical collar 35.
A plurality of ball bearings 359, 3 extending over the inner peripheral surface of
59 is held. Accordingly, the tracing stylus shaft 352
The rotation about the vertical axis and the movement in the vertical axis are smoothed, and the vertical displacement of the tracing stylus shaft 352 is double the vertical displacement of the slide cylinder 357. Further, annular flanges 357a and 357b are formed on the upper and lower ends of the slide cylinder 357. The flanges 357a and 357b are, as shown in FIG.
As a stopper at the bottom dead center position of the tracing stylus shaft 352,
The arm 355 and the fixed cylinder member 353 are brought into contact with each other.

The rack member 358 is positioned coaxially with the fixed cylinder member 353, and has an outer wall supported by a pair of flanges 350a (only one is shown) formed on the slider 350. The flange 350a allows vertical movement of the rack member 358 and restricts its rotation.

Further, the rack member 358 is formed with a slit 358a opening to the outer wall. This slit 3
58a includes a pin 35 protruding from the lower end of the tracing stylus shaft 352.
2a is inserted, and by this insertion, the rack member 358 is vertically displaced in association with the vertical displacement of the rotor shaft 352. Further, a rack 358a is formed on the other outer wall of the rack member 358.

In addition, the slit 358a and the pin 352
By the action of a, the tracing stylus shaft 352 is adapted to rotate within an angle range of approximately 90 ° or less.

As shown in FIG. 10, the rack 358a is fixed to the slider 350 and fixed to the tracing stylus holding member 35.
The pinion 362a of the pinion member 362 fixed to the rotary shaft 361 of the encoder 360 (displacement amount measuring means) that follows the displacement of 1 in the horizontal plane meshes. The encoder 3 including the rack member 358 and the pinion member 362
Reference numeral 60 constitutes vertical movement measuring means.

The fixing portion 362b of the pinion member 362 has a bracket 363 having one end fixed to the encoder 360.
The other end of the coil spring 364 fixed to the
It is fixed while being wound around 2b.

This coil spring 364 is used for the tracing stylus 3
The bias is set so as to cancel the load based on the total weight of each member from 56 to the rack member 358, that is, the direction in which these members are lifted (not actually lifted). It does not interfere with the vertical movement of the tracing stylus 356. Since the coil spring 364 is wound around the fixed portion 362b, the biasing force is substantially uniform. Further, the bracket 363 may be eliminated and one end (on the bracket 363 side) of the coil spring 364 may be fixed to the slider 350.

By the way, the rack member 358 may be a rack member 358 'having a cylindrical shape as shown in FIG. In this case, the slit 35 of the rack member 358
8a and the flange 350a of the slider 350 may not be provided, and may be interlocked with vertical displacement and rotation of the tracing stylus shaft 352.

Therefore, the rack 358b formed on the wall surface of the rack member 358 'is formed over the outer peripheral surface thereof. Note that, in FIG. 12, members corresponding to those in FIGS. 9 to 11 described above are denoted by the same reference numerals, and description thereof will be omitted.

The arm 355 has a horizontal portion 355a whose one end is fixed to the tracing stylus shaft 352, and a vertical portion 355b which is vertically connected to the other end of the horizontal portion 355a so as to extend upward from the horizontal portion 355a.
It is formed in a letter shape.

Also, the vertical portion 355 of the horizontal portion 355a.
A magnetic absorption plate 740 made of a magnetic conductive material such as iron or a permanent magnet is fixed to the end on the single side. The magnetic absorption plate 740 extends in the same direction as the tracing stylus connecting member 400.

Further, as shown in FIG. 1A, the slider 350 is located at the initial position, that is, in FIG.
As shown in (b), the rail holding member 3 of the base 310.
A lower plate portion 741a of a U-shaped bracket 741 is fixed by a screw 742 at a portion close to 10a, and a magnet 743 is fixed to an upper plate portion 741b of the bracket 741. The bracket 741 is located at the center of the pair of guide rails 311 and 311. Although a permanent magnet is used as the magnet 743, the magnet 743 can be an electromagnet.

In addition, the tracing stylus shaft 352 is approximately 12 by the action of the slit 358a and the pin 352a as described above.
Since it is designed to rotate within a fan-shaped angle range of 0 ° or less, the L-shaped arm 3 integrated with the tracing stylus shaft 352 is provided.
55 and the tracing stylus connecting member 400 also rotate integrally with the tracing stylus shaft 352. Further, the horizontal portion 355a of the arm 355 and the tracing stylus connecting member 400 are parallel to the guide rail 311 and
The tip end of the tracing stylus connecting member 400, that is, the tracing stylus 356 (feeler) is configured to rotate leftward and rightward by 45 ° from the position facing the rail holding member 310a side.

As a result, when the slider 350 approaches the rail holding member 310a, the magnetic force of the magnet 743 causes the magnetic attraction plate 740 to be absorbed, and the horizontal portion 35 of the arm 355 is absorbed.
5a and the tracing stylus connecting member 400 are parallel to the guide rail 311, and the tracing stylus shaft 352 is rotated until the tip of the tracing stylus connecting member 400, that is, the tracing stylus 356 (feeler) faces the rail holding member 310a side. .

The tracing stylus connecting member 400 is shown in FIGS.
As shown in FIG. 5, the plate member 402 arranged in the direction along the horizontal portion 355a, the rotary shaft 403 integrally provided at the base end of the plate member 402, and the upper surface of the plate member 402 are fixed to each other. A spring plate 404 and a holding plate 405 fixed on the spring plate 404.

Further, the vertical portion 355b has a structure shown in FIG.
As shown in (a) and (b), a mounting hole 355 is provided at the upper end thereof.
and a ring-shaped bearing 40 having flanges 406a and 406a in both ends of the mounting hole 355c.
6,406 are fitted.

The rotating shaft 4 is provided in the bearings 406 and 406.
03 is fitted, and a fixing screw 407 is attached to the rotary shaft 403.
Is screwed on. The fixing screw 407 and the plate member 40
Rotating part 4 of bearings 406, 406 between the two ends
06b and 406b are held. The rotary shaft 403
The axis O1 of is provided parallel to the measurement reference plane SO and is orthogonal to the axis O2 of the tracing stylus shaft 352.

Further, the tracing stylus 356 is composed of half-divided tracing stylus members 356a, 356b which are arranged so as to sandwich the tip of the spring plate 404 and have a trapezoidal cross section. A mounting shaft 356c is formed at the center of the tracing stylus member 356a, and a mounting hole 356d is formed at the center of the tracing stylus member 356b.
Are formed. A mounting hole 408 is formed at the tip of the spring plate 404 as shown in FIGS. 14 and 15D.

Moreover, the mounting shaft 356c is attached to the spring plate 404.
Is inserted into the mounting hole 408 of the measuring element member 3
It is fitted into the mounting hole 356d of 56b by light press fitting.

In this way, the tracing stylus members 356a, 35
6b, that is, the tracing stylus 356 is rotatably held at the tip of the spring plate 404. The tip of the probe 356 is
It is arranged to be located on the axis line (center line) O2 of the tracing stylus shaft 352.

<Operation control circuit 600 (control unit)> FIG.
FIG. 4 is a block diagram of a calculation control circuit 600 of the lens frame shape measuring device of the present application.

Driver circuit 601 of arithmetic control circuit 600
To 604, 608 and 616 are respectively the X-axis motor 2
06, Y-axis motor 224, sensor arm rotation motor 3
01, the pulse generator 6 is connected to the guide shaft rotation motor 209 and is controlled by the sequence control circuit 610.
09, each of the pulse motors 206, 224, 301, 209, and the electromagnetic magnet 3 according to the number of pulses supplied from
18, the solenoid 730 and the like are rotationally controlled.

The moving amount of the magnetic scale read head 313 is counted by the read output counter 605 and is compared with the comparison circuit 60.
6 is input. The comparison circuit 606 is the reference value generation circuit 60.
7 and a signal corresponding to the radial change range a from 7 and the counter 60.
5 is compared with the variation of the count value from 5, and when the count value is within the range a, the count value ρ _n of the counter 605 and the number of pulses from the pulse generator 609 are converted into the rotation angle of the sensor arm 355, A pair of the value θ _n and (ρ _n , θ _n ) is input to the data memory 611 and stored.

The signal from the encoder 360 is Z
The amount of movement of the tracing stylus 356 in the axial direction is input to the data memory 611 via the counter 615.

<Operation> The operation of the lens frame shape measuring device described above is controlled by the arithmetic control circuit 600 shown in FIG. Hereinafter, the operation control by the lens frame holding and arithmetic control circuit 600 will be described.

[1] Lens Frame Holding First, the hole portion 1 of the sliders 156 and 156 shown in FIG.
Insert fingers into 56c and 156c to slide sliders 156 and 1
The distance between 56 is sufficiently wide, and the slider 15
5, 156 are pressed downward against the elastic force of the leaf springs 154, 154 from the state shown in FIG. 5 to the state shown in FIG.
A sufficient distance is provided between the stepped portions 156b ′ and 156b of No. 6.

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

In this embodiment, the slider 156,
Since 156 has a connection structure by the ring 158, one slider 156, 156 provides the same amount of movement as it is to the other slider. Next, after sliding the frame so that the substantially center of the upper rim of the lens frame 501 is located below the holding rod 152, when the operator releases the sliders 156 and 156, the movable base 1
53 rises due to the elastic force of the leaf springs 154 and 154,
The lens frame 501 has a stepped portion 156 as shown in FIGS.
It is sandwiched between b and 156b and holding rods 152 and 152. At this time, the frame 500 is arranged such that the geometrical center point of the lens frame 501 and the circular opening 157 of the frame holding device 100.
The center point 157a is held so as to substantially coincide with the center point 157a.

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 153a of the movable base 153.
The distance d to is configured to take an equal value.

Next, after inserting the frame holding part 100 holding the frame 500 in this way between the hands 211 and 212 of the supporting device 200 set at a predetermined interval, the Y-axis motor 224 is rotated by a predetermined angle. . The mini-chia belt 226 is driven by the rotation of the Y-axis motor 224, the hand 211 is moved leftward by a certain amount, the frame holding unit 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 holder 100 is
As shown in FIG. 6, both hands 21 are
It is sandwiched between 1,212. At this time, the frame holding unit 1
Side 151 of flange 151 of fixed base 150 of 00
a and 152a are respectively brought into contact with the slope 215 of the hand 211 and the slope 217 of the hand 212, and the movable base 153.
Both sides 153a, 153a are respectively in contact with the slope 216 of the hand 211 and the slope 218 of the hand 212.

In this embodiment, as described above, the distances d from the apex 501a of the bevel groove of the spectacle frame 501 to the sides 151a to 153a are equal to each other, so that the frame holding device 100 is held by the hands 211 and 212. Then, 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.

Further, when the guide shaft rotation motor 209 rotates by a predetermined angle, the frame holding section 100 pivots to the position shown by the two-dot diagonal line in FIG. 7, and the reference plane S is set to the initial position of the tracing stylus 356 of the measuring section 300. Stop on the same plane as the (reference measurement surface SO).

[2] Arrangement of the tracing stylus on the lens frame Next, the Y-axis motor 224 is further rotated to move the hands 211 and 212 holding the frame holding unit 100 by a certain amount in the Y-axis direction, and the frame holding unit 100 is moved. The center point 159a of the circular opening is substantially aligned with the center of the rotation axis 304 of the measuring unit 300. At this time, the tracing stylus 356 contacts the bevel groove 502 of the lens frame 501 during the movement.

[3] Lens Frame Shape Measurement Next, after holding the frame holding portion 100 between the hands 211 and 212 in this way, a measurement start button (not shown) is turned on to start the measurement. This measurement will be described below with reference to the flowchart shown in FIG.

(A) Preliminary measurement (i) Measurement of ρ _n with respect to rotation angle θ _n Step S1 When the measurement start button (not shown) is turned on in this way to start the measurement, the arithmetic control circuit 60 is operated in Step S1.
0 sequence control circuit 610 corresponds to the program memory 6
14 controls the operation of the driver 604 in accordance with
01 is rotationally controlled by a predetermined number of unit rotation pulses, and the motor 301 (that is, the rotation shaft 304) is rotated by a unit angle Δθ.
The rotation angle of the motor 301 is ₀ θ _n (n =
1, 2, 3, ... N) is set as ₀ θ _n ← ₀ θ _n + Δθ.

In this rotation drive control, the tracing stylus 356
Is moved along the bevel groove 502 while rotating around the axis O2, and receives a force in the direction along the bevel groove 502 from the wall surface of the bevel groove 502 that is inclined with this movement.

As a result, the tracing stylus holding member 400 and the rotary shaft 403 are rotated around the axis O1 by the bearing 406, and the tracing stylus 356 is inclined in the direction along the bevel groove 502 as shown in FIG. The tracing stylus 356 is completely engaged with the bevel groove 502 as shown in FIG.

The rotation angle ₀ θ _n of this motor 301 is ₀ θ _n ← ₀
After setting θ _n + Δθ, the process proceeds to step S2.

Step S2 In this step S2, the arithmetic control circuit 600 sets the lens frame shape (ρ _n , θ _n ) for the rotation angle ₀ θ _n of the motor 301 (that is, the rotary shaft 304) in step S1 to the magnetic scale read head 313. Read from the output from.

That is, when the motor 301 is rotationally driven by a predetermined number of unit rotation pulses in step S1, the sensor head portion 312 forms the shape of the spectacle frame 500, that is, one lens frame, in this case, the moving radius of the left lens frame 501. In accordance with this, the rails 311 and 311 are moved, and the moving amount of the sensor head portion 312, that is, the moving amount of the tracing stylus 356 is detected by the magnetic scale 314 and the magnetic scale reading head 313.

The amount of movement of the magnetic scale read head 313 is counted by the read output counter 605 and input to the comparison circuit 606.

On the other hand, from the output from the encoder 360, Z
The amount of movement (ρ _n , Z _n ) of the tracing stylus 356 is also measured at the same time.

As a result, the lens frame shape is ( ₀ θ _n , ₀
Three-dimensional information of ρ _n , Z _n ) (n = 1, 2, 3 ... N) is obtained.

In this step S2, the three-dimensional information at the position where the motor 301 (that is, the rotation shaft 304) is rotationally driven by the unit angle Δθ (that is, the rotation angle ₀ θ _n is the position of ₀ θ _n ← ₀ θ _n + Δθ) ( ₀ θ _n , ₀ ρ _n , Z _n ) (n = 1, 2, 3 ... N) is obtained, and the process proceeds to step S3.

Step S3 At Step S3, the three-dimensional information (at Step S2) (
₀ θ _n , ₀ ρ _n , Z _n ) is stored in the data memory 611, and the process proceeds to step S4.

Step S4 In this step S4, the arithmetic control circuit 600 causes the change amount of the three-dimensional information ( ₀ θ _n , ₀ ρ _n , Z _n ) obtained in step S4 to be a preset operation amount (Δθ, It is determined whether or not it is within (Δρ, ΔZ) (that is, minute rotation angle change Δθ, minute radius change Δρ, minute vertical change ΔZ).
In this judgment, all the set operation amounts (Δθ, Δρ, Δ
If it is within Z), the process proceeds to step S8, the three-dimensional information ( ₀ θ _n , ₀ ρ _n , ₀ Z _n ) is stored in the data memory 611, and the process proceeds to step S9.

On the other hand, in the arithmetic control circuit 600, the measured three-dimensional information ( ₀ θ _n , ₀ ρ _n , ₀ Z _n ) is set to the set operation amount (Δθ,
Δρ, ΔZ) is exceeded, that is, the tracing stylus 366
Is left lens frame 501 as shown in FIG. 23 (a) or FIG. 20 (c).
If it is out of the bevel groove 502, the process proceeds to step S5.

Step S5 In this step S5, the operation of the motor 301 is stopped and the rotation of the base 310 is stopped, so that the rotational movement of the tracing stylus 356 is stopped, and the routine proceeds to step S5-1.

Step S5-1 In this step S5-1, the three-dimensional information of the position where the tracing stylus 366 is displaced from the bevel groove 502 of the left lens frame 501 (
₀ θ _n , ₀ ρ _n , Z _n ) is stored in the data memory, and the process proceeds to step S5-2.

Step S5-2 In this step S5-2, the arithmetic and control circuit 600 energizes the solenoid 730 via the driver 616 and shifts to step S5-3. By this energization, the actuator 731 resists the spring force of the spring 725 and the arrow 73
2 in the direction of the rotation shaft 722
23 is rotated in the direction of the arrow 733 about the 23, and the friction locking member 729 of the rotation frame 722 is moved to the slider 35.
0 is pressed against the lower surface of the slider 350, the slider 350 is locked,
The tracing stylus 356 is fixed at this position.

When the tracing stylus 356 is largely displaced from the bevel groove 502 of the left lens frame 501 as shown in FIG. 23 (a), the tracing stylus 356 is not damaged, but the tracing stylus 356 is shown in FIG. When the base 310 is further rotated by the motor 301 in a state where it is slightly disengaged from the bevel groove 352 as shown in (c), or in a state where the tracing stylus 356 is caught by the left lens frame 501 as shown in FIG. 356 and the mechanism that supports it may be damaged, but as in this step, by stopping the rotation of the motor 301 and the base 310 and stopping the movement of the probe 356, the probe 356 and this are removed. It is possible to prevent the supporting mechanism from being damaged.

Step S5-3 In this step S5-3, the tracing stylus 356 is used as the bevel groove 5.
Based on the radial information ( ₀ θ _n , ₀ ρ _n ) at the position deviated from 02,
In the direction in which the tracing stylus 356 moves away from the bevel groove 502 of the lens frame 501, the motor 206 is operated and controlled to move the moving stage 203 in the X direction, and at the same time, the motor 209.
Is controlled to move the hands 211 and 212 in the Y direction. That is, at this time, the tracing stylus 356 makes the lens frame 50
The motors 206 and 209 are operationally controlled so as to relatively move in the direction of the center of 1 (direction in which the radius vector ₀ ρ _n becomes smaller at the angle ₀ θ _n ).

When the tracing stylus 356 is moved to the center of the lens frame 501, the process proceeds to step S5-4.

Step S5-4 In this step S5-4, the operation of the motor 209 is controlled so that the distal end sides of the hands 211 and 212 are integrally rotated with the rotary shaft 208 so that the hands 211 and 212 are rotated upward.
The tracing stylus 356 is removed from the lens frame 501 of the spectacle frame 500 held by the frame holding unit 100 between the two, and the process proceeds to step S5-5.

Step S5-5 In this step S5-5, the energization of the solenoid 730 is stopped and the operation proceeds to the discarding step S6. When this energization is stopped, the rotating frame 722 is rotated in the opposite direction to the above by the spring force of the spring 725, the friction locking member 729 is separated from the slider 350, and the slider 350 is moved to the guide rail 311. You will be able to move freely along it.

As a result, the slider 350 causes the guide rails 311 and 3 to move by the spring force of the spiral spring 316.
11 is moved to the rail holding member 310a side. Then, the slider 350 becomes the rail holding member 310.
When approaching a, the magnetic force of the magnet 743 causes the magnetic absorption plate 740.
Is absorbed, the horizontal portion 355a of the arm 355 and the tracing stylus connecting member 400 are parallel to the guide rail 311, and the tip of the tracing stylus connecting member 400, that is, the tracing stylus 356.
The tracing stylus shaft 352 is rotated until the (feeler) faces the rail holding member 310a. As a result, the tracing stylus 356 always faces the set direction (normal direction of the lens frame 501) at the initial position.

Step S6 In this step S6, the motors 206, 209, 22
By operating and controlling 4,301 and the like, the tracing stylus 356 is engaged with the bevel groove 502 on the lower side of the left lens frame 501. At this time, the tracing stylus 356 is oriented in the normal direction of the lens frame 501 as indicated by the arrow in FIG. 24B, and from the normal direction, the tracing stylus 356 is located at the central portion of the lower rim of the left lens frame 501. Since it is engaged with the bevel groove 502, the arm 355 does not interfere with the left lens frame 501 and it is possible to prevent the measurement from being disturbed.

Step S7 In step S7, the three-dimensional information ( ₀ θ _n , ₀ ρ _n , of the bevel groove of the left lens frame 501 stored in the data memory 611 is stored.
The inclination angle of the left lens 501 to the side opposite to the nose pad is calculated based on ₀ Z _n ).

That is, when the distance between the nose pad of the left lens frame 501 of the spectacle frame 500 and the temple is a, the arithmetic control circuit 600 sets the three-dimensional information ( ₀ ρ _n , ₀ θ _n , ₀ Z _n ) for each Δθ. The inclination amount ψ of the lens frame 501 is obtained from the change amount of In the present embodiment, it is calculated that the tracing stylus 356 is displaced from the bevel groove 502 on the temple side, but this a is the length from the nose side to the position where the tracing stylus 356 is displaced. When this inclination amount ψ is obtained, the process proceeds to step S8.

Step S8 In this step S8, the arithmetic control circuit 600 integrates with the guide shaft 208 by controlling the rotation of the guide shaft 208 by controlling the operation of the motor 209 based on the inclination amount ψ obtained in step S7. 23, by rotating the hands 211 and 212 up and down, the nose pad side and the temple side of the left lens frame 501 have substantially the same inclination amount as shown in FIG.
The tilt correction is performed by rotating the reference surfaces S of Nos. 1 and 219 downward by ψ with respect to the measurement reference surface S0, the process returns to step S1, steps S1 to S4 are executed, and the step S4 is performed in step S4. Three-dimensional information ( ₀ θ _n , ₀ ρ _n ,
The change amount of Z _n ) is a predetermined set operation amount (Δθ, Δρ,
Whether it is within ΔZ) or not, and if it is within a predetermined set operation amount (Δθ, Δρ, ΔZ), the process proceeds to step S9.

Although the calculation control circuit 600 automatically performs the tilt adjustment (tilt correction), the operator may manually perform the tilt adjustment.

Step S9 In step S9, the rotation angle ₀ θ _n of the motor 301 is 360
If it is 360 °, the process proceeds to step S9-1, and if it is less than 360 °, the process proceeds to step S1 and loops.

Through these steps S1 to S9, the lens frame shape after tilt correction, that is, the three-dimensional information ( ₀ θ _n , ₀ ρ _n , ₀ Z) when the tracing stylus 356 is not removed from the bevel groove 502 and when it is removed. _n ) is measured.

Step S9-1 In step S9-1, the arithmetic control circuit 600 determines whether or not the tilt adjustment (tilt correction) has been performed so that the nose pad side and the temple side of the lens frame 501 have substantially the same tilt amount. When the tilt is adjusted, the process proceeds to step 13, and when the tilt is not adjusted, the process proceeds to step S10.

Step S10 After such measurement, the measured point B having the maximum value in the X-axis direction is obtained from the data (X _n , Y _n ) after the measurement data (ρ _n , θ _n ) is converted into polar coordinates and orthogonal coordinates. (x _b, y _b), the measurement point D having the minimum value in the X-axis direction (x _d, y _d), the measurement point having the maximum value in the Y axis direction _a (X _a, y _a) and Y-axis The measured point C (x _c , y _c ) having the minimum value in the direction is selected, and the geometric center O ₀ of the lens frame is set to O ₀ (x ₀ , y ₀ ) = ((x _b + x _d ) / 2, (Y _a + y _c ) / 2) (1), and then the arithmetic control circuit 600 measures ( ₀ ρ _n , ₀ θ _n ) (n = 1: 2: 3) at the geometric center O ₀ .
.. N). Incidentally, as shown in FIG.
The center O of 4 is measured by making it substantially coincide with the geometric center of the lens frame 501.

When the amount of movement of the magnetic scale read head 313 is counted by the read output counter 605 and input to the comparison circuit 606, the comparison circuit 606 causes the reference value generation circuit 607 to set the operation amount (Δθ, Δρ,
The signal corresponding to ΔZ) is compared with the change amount of the count value from the counter 605.

In this comparison, when the count value is within the set operation amount (Δθ, Δρ, ΔZ), the count value ρ _n of the counter 605 and the number of pulses from the pulse generator 609 are converted into the rotation angle of the sensor arm 355. Then, (ρ _n , θ _n ) is input to the data memory 611 as a set with the value θ _n, and is stored.

The x-axis motor 20 is based on the x ₀ and y ₀ values.
6 and the Y-axis motor 224 to drive the hands 211, 21.
The frame holding unit 100 sandwiched by 2 is moved so that the geometrical center O ₀ of the lens frame 501 coincides with the rotational center O of the sensor arm 302, the lens frame shape is measured again, and the geometrical center O ₀ is measured. It is also possible to obtain measured values ( ₀ ρ _n , ₀ θ _n ).

In such preliminary measurement, since the lens frame 501 is inclined as shown in FIGS. 7 and 21, the center line 503 of the bevel groove 502 is θ at the upper end and the lower end of the lens frame 501. Only inclined. For this reason, the feeler 356 cannot contact the groove bottom of the bevel groove 502 of the lens frame 501 and is in contact with either of the inclined surfaces 502a and 502b.

As a result, in the above-mentioned preliminary measurement, the distance d between the upper end and the lower end of the bevel groove 502 of the lens frame 501.
It is not possible to accurately measure (d ≠ c = (a ² + b ² ) ^1/2 ), and the dimension of c that is smaller by 2Δd is actually measured (measured). Therefore, in order to eliminate this error, the arithmetic and control circuit 600 obtains the tilt angle θ in step 10, corrects the tilt angle θ in step 11 when the tilt angle θ is equal to or larger than the predetermined angle β, and accurately measures in step 12. It is supposed to do.

Further, the arithmetic control circuit 600 uses the lens frame shape information (, ₀ θ _n , ₀ ρ _n , obtained as described above).
₀ z _n ) of the height zn from the reference measurement surface SO (h
min) and the maximum (hmax),
The tilt angle (frame tilt) angle θ of the lens frame 502 shown in FIG. 1, that is, the center line 5 connecting hmin and hmax of the bevel groove 502.
An angle θ of 03 with respect to the reference measurement surface SO is obtained.

If the amount of movement of the feeler 356 in the left and right directions is a and the amount of movement of the feeler 356 in the z direction is b, the tilt angle θ can be calculated from tan θ = b / a. After the inclination angle θ is obtained in this way, it is determined whether or not the inclination angle θ obtained in step S10 is a predetermined angle β (for example, 5 °) or more.

In this determination, the tilt angle θ is the predetermined angle β
If it is less than step 12, step 12 is performed without performing step 11.
When the tilt angle θ is equal to or larger than the predetermined angle β, the process proceeds to step 11 to correct the tilt. The arithmetic control circuit 6
If 00 is less than or equal to a fixed amount such that the inclination angle β is about 5 °, step S11 is omitted and the process ends. In this case, the lens frame shape information at the time of preliminary measurement, that is, three-dimensional information ( ₀ θ _n , ₀ ρ _n ,
₀ Z _n ) is stored in the data memory 611 as the lens frame shape information (θ _n , ρ _n , z _n ), and the process ends.

Step 11 [Bevel groove inclination adjustment (inclination correction)] Next, the arithmetic control circuit 6
00 drives and controls the motor 209 to drive the guide shaft 208.
By controlling the rotation of the hand, the frame holding device 100 and the spectacle frame 500 are integrated with the hands 211 and 212.
Is rotated downward by an angle θ and stopped. At this position, the center line 5 of the lens frame 501 of the eyeglass frame 500 is
03 is parallel to the plane including the apex of the feeler 356 as shown in FIG. Then, d and a in FIG.
Are equal, that is, d = a.

Step 12 [Main Measurement] In step 12, the arithmetic control circuit 600, after finishing the inclination correction as described above, causes the feeler 356 to perform the same procedure as in steps 1 to 4 and 9 for the spectacle frame 500.
The new lens frame shape information (θ _n , ρ _n , z _n ) of the left lens frame 501 and the right lens frame 501 is measured.

At the time of this measurement, the feeler 356 substantially coincides with the bevel groove 502, and the apex of the feeler 356 engages with the bottom of the bevel groove 502. Therefore, the distance d of the bevel groove 502 of the lens frame 501 can be accurately measured. .

The spectacle frame 5 thus obtained
The new lens frame shape information (θ _n , ρ _n , z _n ) of the left lens frame No. 00 and the right lens frame 501 is stored in the data memory 611.

In this embodiment, the shape is measured by correcting only the frame inclination of the lens frame 501.
The inclination of the center line at all points of the bevel groove 502 of the lens frame 501 is sequentially corrected horizontally as described above,
It is also possible to measure the frame shape by measuring the coordinates of each point. Further, based on the eccentricity information which is the difference between the geometrical center O ₀ of the lens frame 501 and the rotational center O of the sensor arm 302, which is input in advance, the measurement with the rotational center O of the sensor arm 302 as the center is performed. You may Also, the left lens frame 5 and the right lens frame 5
It is possible to obtain the frame PD (FPD) by obtaining the geometrical center position of each lens frame from the 01 lens frame shape information (θ _n , ρ _n , z _n ), and obtaining the distance between the central positions. After this main measurement is completed, the calculation result is stored in the data memory 6
11 is stored and it ends.

Step 13 In step S13, the arithmetic control circuit 600 determines that the motor 2
06, 301 and the like are operated and controlled, the tracing stylus 356 is removed from the bevel groove 502 of the left lens frame 501, and the motor 209
After rotating the hands 211 and 212 upwards, the motors 206, 209, 2274, 301 and the like are operated and controlled to move the tracing stylus 356 to the spectacle frame 500 as shown in FIGS. 24 (a) and 24 (b). The bevel groove 502 on the lower side of the right lens frame 501.

After that, the arithmetic control circuit 600 determines that the motor 3
01 is controlled to rotate, and the nose pad 2 of the right lens frame 501 is controlled.
The tracing stylus 356 is within a predetermined angle range around the position of 0 (in the present embodiment, within an angle range of about 180 ° indicated by reference numeral LX).
Then, the same measurement as shown in steps S1 to S3 is performed, and the process proceeds to step S14. In the figure, 21 is a bridge connecting the left and right lens frames 501 and 501 of the spectacle frame 500, and 22 is a temple as an ear hook of the spectacle frame 500.

Step S14 In this step S14, the drive control amount of the motors 206, 209, 224, 301 and the like in step S12 and the lens frame shape information ( ₀ θ _n on the nose pad side of the right lens frame 501 obtained in step S13 , ₀ ρ _n , ₀ z _n ) and the lens frame shape information ( ₀ θ _n , ₀ ρ _n , ₀ z _n ) of the left lens frame 501 obtained in steps S1 to 9 and the like, that is, the size of the nose pad 20, that is, The bevel grooves 502, 502 of the left and right lens frames 501, 501
The distance e on the side of the nose pad 20 (see FIG. 24A) is calculated.

On the other hand, from the lens frame shape information ( ₀ θ _n , ₀ ρ _n ) of the left lens frame 501, the maximum lateral movement distance G (movement distance in the bevel groove 502) a of the left lens frame 501 is a = co.
Calculate as sψ. Note that G is obtained from the lateral movement position of the tracing stylus 356 when the tilt is corrected as shown in FIG. 23B, that is, from the lens frame shape information ( ₀ θ _n , ₀ ρ _n ) of the left lens frame 501.

Then, the distance e on the nose pad side and the lens frame shape information of the left lens frame 501 (step S10) (
₀ θ _n , ₀ ρ _n , ₀ z _n ) and the left and right lens frames 501 and 501.
The geometric center distance FPD of is calculated, the calculation result is stored in the data memory 611, and the processing is ended.

Although the preliminary measurement and the main measurement are performed in the example described above, the main measurement may be omitted. That is, steps S9-1 to S12 are omitted, and the rotation angle ₀ θ _n is 360 ° in the determination of step S9.
If it is (one rotation), the process may proceed to step S13.

[Supply of Data to Scouring Machine] The lens frame shape information (ρ _n , θ _n , z _n ) and FPD thus obtained and stored in the data memory 611 are gated as necessary. By switching the circuit 612, for example, it is determined whether or not the shape of the digital ball slicing machine, the mold taker, or the frame disclosed in Japanese Patent Application No. 58-225197 filed earlier by the present applicant is processed as designed. The curve value c of the lens frame is calculated from the Z _n information of the lens frame shape information (ρ _n , θ _n , z _n ) that is supplied to the determination device or the like that is stored in the data memory 611, as necessary, and the arithmetic circuit 613 is used. Can be found at.

The calculation is performed with reference to FIGS.
As shown in (B), at least two points a on the lens frame,
From radiuses ρ _iA and ρ _{iB at} b and the sensor head movement values Z _A and Z _{B in} the Z-axis direction at these two points, the radius of curvature R of the spherical body SP including the beveled locus of the lens frame 501 is R ² = ρ _{iA ^{2 + (Z 0 -Z a)}} 2 R 2 = ρ IB 2 + (Z 0 -Z a) obtained from ² (2), the curve value c of the bevel is, C = the determined R {(n- 1) / R} × 1000 (3) (constant n
= 1.523).

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

The lens L of the finished size processed based on the data thus obtained is shown in FIG.
As shown in (c), the size is processed to be almost the same as the size d.

Further, the rotary shaft 403 is interlocked with the rotary encoder through the pulley and the wire, and the output signal from the rotary encoder is controlled by the arithmetic control circuit 600.
To the operation control circuit 600 to calculate the tilt angle of the tracing stylus 356 based on this signal to know how much the lens frame 501 of the eyeglass frame 500 is tilted with respect to the reference measurement surface SO. It is also possible to make it possible to perform shape measurement more suited to the shape of the lens frame 501.

[Second Embodiment] FIG. 25 shows a second embodiment of the present invention.
Another example of the above-described embodiment, in which the rotation of the motor 301 is transmitted to the base 310 by the pulley 303 and the belt 305, and a head movement amount detecting means including a magnetic scale reading head 313 and a magnetic scale 314 is provided. It is shown.

In this embodiment, the base 310 is formed into a disc shape as shown in FIG. 25, and a gear portion 370 is provided on the peripheral surface of the base 310 to form a base gear. The gear portion 370 has an output shaft of the motor 301. Drive gear 301 provided on 301a
The rotation of the motor 301 is transmitted to the base 310 by engaging b. In FIG. 25, the portion indicated by O (corresponding to the rotation center position of the measuring portion) is rotatably supported by the housing 201 by the rotating shaft 304 shown in FIG.

As the head movement amount reading means, a rotary encoder 312b fixed to the lower surface of the base 310 and having an output shaft 312a penetrating the base 310,
A rack 312c fixed to the sensor head portion 312 in parallel with the rail 311 and a pinion 312d fixed to the output shaft 312a and meshing with the rack 312c are provided.

In this case, when the sensor head portion 312 moves along the rail 311, the rack 312c rotates the pinion 312d, and the rotary encoder 31
2b detects the amount of movement of the sensor head 312 and outputs a detection signal. This detection signal is a movement amount detection circuit 615.
Is input to the data memory 611 via.

Note that, in FIG. 25, members located above the slider 350 according to the second embodiment of the present invention, namely, the tracing stylus 356, the tracing stylus shaft 352, and the slide cylinder 35.
7, only the cylindrical collar 354 is schematically illustrated, but actually, the one disclosed in FIGS. 9 to 11 or 12 is used. Further, in FIG. 25, 372 is a base 310.
Slits 310a and 310b are provided on the base 3
A rail holding member which is fixed on the rail 10 and holds both ends of the rails 311 and 311 is a lens 700 for measuring the distance between the left and right lens frames 501 and 501 by the line LED 702 and the on-line area CCD 703 facing each other. An inter-frame distance measuring unit 803 is a light shielding plate fixed to the peripheral edge of the base 310 and partially protruding from the peripheral edge.

According to the above-described embodiment, the shape of the lens frame can be measured automatically or manually even in the case of a spectacle frame which is greatly distorted such that the tracing stylus is out of the lens frame. Further, the tracing stylus does not deform or be damaged by colliding with the lens frame.

Even when the frame PD of the lens frame which is largely distorted as in the conventional case is obtained, the geometric center positions of the left and right lens frames are obtained from the measurement results of the left and right lens shapes, and the distance between the center positions is calculated. There has been a demand for a lens frame shape measuring device capable of obtaining the frame PD based on the information of the lens frame shape measured within the range where the feeler does not come off without providing a means for measuring

The above-described embodiment meets this demand, and the means for determining the geometrical center positions of the left and right lens frames from the measurement results of the left and right lens frame shapes and providing the means for measuring the distance between the center positions is not provided. The frame PD can be obtained based on the information on the lens frame shape measured within the range where the feeler does not come off. The main body of the device can be downsized, and moreover, regardless of the degree of curvature of the lens frame, the probe can be prevented from coming off due to the vertical displacement, and a highly reliable vertical measurement result can be obtained. .

In the embodiment described above, the hand 2
The motors 206 and 209 are driven and controlled in the horizontal direction to control the glasses frame held by the frame holding means in the horizontal direction relative to the tracing stylus, but the invention is not limited to this. is not.

For example, the stage 203, the hand 211,
The motor 3 is not configured to move the 212 and the like in the horizontal direction.
01 and the base 301 are held by a measuring portion supporting means (slide base plate) not shown, and the measuring portion supporting means is held on the housing 201 so as to be horizontally movable, and the measuring portion horizontal driving means such as a motor is used. A tracing stylus support moving base configured to horizontally drive the measuring portion supporting means (slide base plate) and supported on the measuring portion supporting means (slide base plate) when the tracing stylus 356 comes off the lens frame. It is also possible to suppress the horizontal movement of the (slider-350) and drive and control the measuring section supporting and moving means by the control section (arithmetic control circuit) so as to separate the tracing stylus from the lens frame.

[0138]

According to the present invention, since the tracing stylus control member for controlling the initial position of the tracing stylus with respect to the rotation center position of the measuring unit is provided, the tracing stylus control member measures the rotation center position of the measuring unit. The initial position of the probe is controlled so that the probe engages with the bevel groove in the direction normal to the lens frame. For this reason,
The shape of the lens frame can be measured without interfering with the lens frame.

[Brief description of drawings]

1A is a perspective view showing a lens frame shape measuring device of the present invention, and FIG. 1B is a main part of an orientation setting means for setting the orientation of a tracing stylus when a slider is located at the position of FIG. FIG.

FIG. 2 is a perspective view showing a relationship between a frame holding device and glasses.

FIG. 3 is a diagram illustrating the operation of the frame holding device.

FIG. 4 is an operation explanatory view showing a state in which the frame holding device holds glasses.

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

FIG. 6 is a cross-sectional view showing a relationship between a support device section and a tracing stylus.

FIG. 7 is a schematic diagram showing an operation of a supporting device section.

8A is a cross-sectional view of a spring member, FIG. 8B is a perspective view of essential parts showing the relationship between a slider lock device and a base, and FIG.
FIG. 3 is a perspective view of a main part of a slider lock device.

FIG. 9 is a perspective view of a main part showing an appearance of a tracing stylus shaft holding member.

FIG. 10 is a perspective view of an essential part showing the outer appearance of the vertical movement measuring means.

11A is a front view of the tracing stylus shaft holding member in a top dead center state, FIG. 11B is a longitudinal sectional view of the tracing stylus shaft holding member, and FIG. 11C is a tracing stylus shaft holding member in a bottom dead center state. FIG.

FIG. 12 is a perspective view of a main part showing a modified example of the tracing stylus shaft holding member.

FIG. 13 is a perspective view of a tracing stylus attachment portion.

FIG. 14 is an exploded perspective view of a tracing stylus holding member and a tracing stylus.

15A is a plan view in which a part of a tracing stylus mounting portion is cut away, and FIG. 15B is a side view in which a part of a tracing stylus mounting portion is cut away;
(C) is a front view of the probe mounting portion, (d) is A- of (a)
It is an expanded sectional view of the principal part of a tracing stylus attachment part which follows the A line.

FIG. 16 is a control circuit of the lens frame shape measuring device.

17 is a flowchart of the control circuit shown in FIG.

FIG. 18 is a schematic diagram for obtaining a geometric center of a lens frame from measured values.

19A and 19B are explanatory diagrams for calculating the curve value C of the lens frame.

FIG. 20 (a) is an operation explanatory view of a tracing stylus by a lens frame shape measuring device, FIG. 20 (b) is a sectional view taken along the line BB of FIG. 20 (a), and FIG. It is sectional drawing which shows a state.

FIG. 21 shows the relationship between the height hmin on the nose side (left side in the figure) and the height hmax on the ear hook (vine) side in the preliminary measurement of the lens frame by the lens frame shape measuring device, and the contact state of the probe. It is an explanatory view of a lens and a lens frame which are ground based on the lens frame shape data at that time.

22 is an explanatory diagram showing a relationship between a lens and a lens frame ground based on the lens frame shape accurately measured by the apparatus shown in FIGS. 1 to 16;

23 (a) and (b) are explanatory views when measuring the lens frame shape according to the flowchart shown in FIG.

FIG. 24 (a) is an explanatory diagram for measuring the interval between nose pads,
23B is an explanatory diagram of the moving range of the probe in FIGS. 23 and 24A.

FIG. 25 is a perspective view of essential parts showing a second embodiment of the lens frame shape measuring device.

FIG. 26 is an explanatory view of inclination of a conventional eyeglass frame.

FIG. 27 (a) is an explanatory view showing an example of a relationship between a tracing stylus of a conventional lens frame shape measurement measurement and a bevel groove of the lens frame,
(b) is an enlarged view of a main part of (a), (c) is an explanatory view showing a relationship between a lens and a lens frame ground based on a lens frame shape measured by a conventional lens frame shape measuring device. .

FIG. 28 is an explanatory diagram for explaining a conventional problem.

[Explanation of reference numerals] 100 ... Frame holding means 200 ... Device body 356 ... Measuring element 500 ... Glasses frame 600 ... Arithmetic control circuit (control section)

Claims (1)

[Claims] 1. A frame holding means which is attached to a main body of the apparatus and is provided so that the left and right lens frames of an eyeglass frame can be held at the same time; A measuring element for measuring the lens frame shape, a measuring section that supports the measuring element and detects the movement of the measuring element to obtain the lens frame shape of the spectacle frame, and a measuring element with respect to the rotation center position of the measuring section. A tracing stylus control member for controlling the initial position is provided, and the tracing stylus control member controls the initial position of the tracing stylus with respect to the rotational center position of the measuring unit so that the tracing stylus hits the bevel groove from the normal direction of the lens frame. A lens frame shape measuring device, characterized in that the lens frame shape is configured so that the lens frame shape of the spectacle frame is obtained by contact.