JPH01409A - Frame shape measuring device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is an apparatus for digitally measuring the shape of a lens frame of an eyeglass frame or a template patterned from the shape of a lens frame. The present invention relates to a device suitable for use in combination with a milling machine that performs grinding processing based on information regarding the shape of a frame or template.

[Background of the invention]

Traditionally, the lens frame or template of eyeglass frames is fixed,
No device is known for measuring this shape. In parallel with the development of a beading machine, the present inventor developed a lens frame or template measuring device suitable for the same, and has now accomplished the present invention.

[Structure of the invention]

The present invention includes a frame holding means for holding a spectacle frame having a lens frame to be measured, a feeler that comes into contact with a bevel groove of the lens frame, and a detection means for detecting the three-dimensional movement amount of the feeler. A frame shape measuring device characterized by:

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a lens frame shape measuring device according to the present invention.

This device mainly consists of three parts: a frame holding device part 100 that holds the frame, a frame holding part 100 that supports the frame holding part 100, and a frame holding part 100 that supports the frame holding part 100 and transfers the holding part into the measurement surface and the measurement surface. The eyeglass frame consists of a support device section 200 that controls movement within the eyeglass frame, and a measurement section 300 that digitally measures the shape of the lens frame or template of the eyeglass frame.

The support device section 200 includes a guide rail 202a installed in parallel to the vertical direction (X-axis direction of the measurement coordinate system) on the housing 201.
, 202b, on which a movable stage 203 is slidably mounted. Moving stage 20
A female threaded portion 204 is formed on the lower surface of 3, and an X-axis feed screw 205 is screwed into this female threaded portion 204. This X-axis feed screw 205 consists of a pulse motor.
It is rotated by a shaft motor 206.

Flanges 20 on both sides of the moving stage 203? a.

Between 207b and 207b, there is a guide shaft 2 parallel to the Y-axis direction of the seed yarn to be measured.
08 is passed, and this guide shaft 208 is connected to the flange 2.
It is configured to be rotated by a guide shaft motor 209 attached to the shaft 07a.

The guide shaft 208 has a guide groove 210 formed on its outer surface parallel to the shaft.

Hands 211 and 212 are slidably supported on the guide shaft 208. The shaft hole 21 of this hand 211゜212
3. 214 are formed with protrusions 213a and 214a, respectively, and these protrusions 213a and 214a are engaged in the guide groove 210 of the guide shaft 208 described above, and the hands 211 and 212 are rotated around the guide shaft 208. It prevents the rotation of.

The hand 211 has two slopes 215° and 216 that intersect with each other.
Similarly, the other hand 212 has two slopes 217 and 218 that intersect with each other. /'% The ridgeline 220 formed by the side slopes 217 and 218 of the hand 212 is parallel to and in the same plane as the ridgeline 219 formed by the slopes 215 and 216 of the hand 211, and the angle formed by the slopes 217 and 218 is The angles formed by the slopes 215 and 216 are configured to be equal. A spring 230 is suspended between the hands 211 and 212, as shown in FIG. 5(B).

A boo IJ-222 is rotatably supported on one end of the rear flange 221 of the moving stage 203, and a boo IJ-223 is rotatably supported on the other end of the rear flange 221 on the Y axis.
224 is attached. Pulley 223, 22
Mini cheer belt 2 with spring 225 interposed in 4
26 is hooked, and both ends of the mini cheer belt 226 are fixed to pins 227 planted on the upper surface of the hand 211.

On the other hand, a flange 228 is formed on the upper surface of the hand 212, and the flange 228 is attached to the pin 2 implanted in the rear flange 221 of the moving stage 203 as the hand 212 moves.
It is configured so as to come into contact with the side surface of 29.

The measurement unit 300 includes a sensor arm rotation motor 301 attached to the lower surface of the housing 201 and a sensor arm portion 302 rotatably supported on the upper surface of the housing 201. Boo IJ-303 attached to the rotating shaft of motor 301
A belt 3 is connected between the rotating shaft 304 of the sensor arm and
The rotation of the motor 301 is transmitted to the sensor arm.

The sensor arm section 302 has two rails 311, 311 extending above its base 310, 117), and the sensor head section 312 is slidably mounted on these rails 311, 311. A magnetic scale reader 313 is attached to one side of the sensor head section 312, which reads a magnetic scale 314 attached to the base 310 in parallel with the rail 311 to detect the amount of movement of the sensor head section 312. It is configured. Further, on the other side of the sensor head section 312, a spring device 3 is provided that constantly pulls the head section 312 toward the side surface of the arm end.
One end of 15 mainspring springs 316 is fixed.

FIG. 4 shows the configuration of this spring device 315. An electromagnetic magnet 318 is provided in a casing 317 attached to a base 310 of the sensor arm section 302, and a slide shaft 319 is fitted into a shaft hole of the magnet 318 so as to be slidable in the axial direction thereof. This slide shaft 319 has flanges 320 and 321, and a spring 323 is interposed between the flanges 320 and the wall of the casing 317.
3, the slide shaft 319 is normally moved to the left in FIG.

A clutch plate 324.32 is attached to the wall of the slide shaft 319.
5 is rotatably supported, and one end of a mainspring spring 316 is fixed to one clutch plate 324. Further, a spring 326 into which a slide shaft 319 is inserted is interposed between both clutch plates 324 and 325, and these clutch plates 324 and 325 are always connected to each other.
4,325 is widened to prevent contact between the mainspring spring 316 and the clutch plate 325. Furthermore, a washer 327 is attached to the end of the slide shaft 319.

FIG. 6 shows the configuration of the sensor head section 312. A slider 350 supported by a rail 311 has a shaft hole 351 formed in the vertical direction, and a sensor shaft 352 is inserted into this shaft hole 351.

The sensor shaft 3 is located between the sensor shaft 352 and the shaft hole 351.
A ball bearing 353 held by the sensor shaft 352 is interposed therebetween, thereby smoothing the rotation of the sensor shaft 352 around the vertical axis and the movement in the vertical axis direction.

The upper part of the sensor shaft 352 has a notch with a half-moon-shaped cross section, and this notch surface 354 matches the side surface of the template when measuring the shape of the template that has been copied from the lens frame shape of the eyeglass frame. Configure the contacting template filler. Further, an arm 355 is attached to the center of the sensor shaft 352, and a bevel feeler 356 in the shape of a solo pan bead that comes into contact with the bevel groove of the lens frame is rotatably supported on the upper part of the arm 355. There is. Both the notch surface, that is, the template abutting surface 354 and the circumferential point of the bevel feeler 356 are located on the center line of the vertical sensor shaft 352.

A reading head 359 of a sensor 358 made of, for example, Magnescale is attached below the slider 350 to measure the amount of movement of the sensor shaft in the vertical axis direction, that is, the amount of movement in the Z-axis direction. On the other hand, the sensor shaft 352
A magnetic scale 360 of the sensor 358 is attached to the lower end of the sensor.

Next, the configuration of the frame holding device section 100 will be explained based on FIG. 2(^) and FIG. 3. Side 15 of fixed base 150
A frame holding rod 152.152 is screwed to the center of both flanges 151.151 having 1a and 151a. A movable base 153 having sides 153a, 153a is inserted between the bottom plate 150a of the fixed base 150 and the flange 151, and the movable base 153 is supported by two leaf springs 154. 154.

The movable base 153 has two parallel guide grooves 155.1.
55 is formed, and the protruding legs 156a, 156a of the slider 156.156 are engaged with this guide groove 155°155, and the slider 156.156- is moved to the movable base 153.
It is slidably mounted on the top.

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 into the inner periphery of the circular opening 157. There are two pins 15 on the top surface of this ring 158.
9, 159 are implanted, and these pins 159, 159 are inserted into the stepped portions 156b, 1 of the slider 156, 156, respectively.
56b) is inserted into the slot 156c formed in the slot 56b.

Furthermore, twill-shaped notches 156d, 156d are formed at the center of the sliders 156, 156, and the notches 156
d, the aforementioned frame holding rods 152, 152 in 156d.
can be inserted respectively. Also, slider 1
56. On the top surface of 1-56, there is a hole 156e for easy operation by inserting a finger of the operator when operating the slider.
156e is formed.

Next, Fig. 2 (B), (C) and Fig. 5 (A), (B)
The operation of the above-mentioned frame shape measuring device will be explained based on the following. First, as shown in FIG. 2(B), the slider 156
．． Insert your fingers into the holes 156c, 156c of the slider 156. i56 with a sufficient distance from each other and press downward, the leaf springs 154.
The holding rod 152 and the slider 15 resist the elastic force of 154.
6,156 and the stepped portions 156b, 156b are sufficiently spaced apart from each other.

Then, insert the lens frame 501 of the eyeglass frame 500 that you want to measure into this interval, and adjust the interval between the sliders 156 and 156 so that the upper and lower rims of the lens frame 501 are in contact with the inner walls of the sliders 156 and 156. Narrow down. In this embodiment, since the sliders 156, 156 have a connection structure using the ring 158 as described above, the amount of movement of one of the sliders 156, 156 directly gives the same amount of movement to the other slider.

Next, approximately the center of the upper rim of the lens frame 501 is located at the holding rod 15.
When the operator releases his/her hand from the slider 156, 156 after sliding the frame so that it is below the slider 156, the movable base 153 rises due to the elastic force of the leaf spring 154. , 156b and the holding rods 152, 152, and the frame 50
0 is held so that the approximate geometrical center point of the lens frame 501 and the center point 157a of the circular filling opening 157 of the frame holding bag holder 1000 are substantially aligned.

Also, at this time, the apex 501a of the bevel groove of the lens frame 501
The distance d from the flange 151 of the fixed base 150 to the side 151a of the movable base 153 and the distance d from the side 153a of the movable base 153 are configured to take equal values.

Next, after the frame holding device section 100 holding the frame 500 in this manner is inserted between the hands 211 and 212 of the support device 200 which are set at a predetermined interval, the Y-axis motor 224 is rotated by a predetermined angle. Y-axis motor 224
The mini-cheer belt 226 is driven by the rotation of , the hand 211 is moved to the left by a certain amount, the frame holding device section 100 and the hand 212 are also induced to move to the left, and the tsuba 2
28 comes off from pin 229.

At the same time, the frame holding device section 100 has a tension spring 230
is held between both hands 211 and 212. At this time, the side 151a of the flange 151 of the fixed base 150 of the frame holding device section 100.

152a are in contact with the slope 215 of the hand 211 and the slope 217 of the hand 212, respectively, and the movable base 153
Both sides 153a, 153a of are in contact with the slope 216 of the hand 211 and the slope 218 of the hand 212, respectively.

In this embodiment, as described above, the distances d from the apex 501a of the bevel groove of the glasses frame 501 to the sides 151a and 153a are equal to each other, and when the frame holding device 100 is held by the hands 211 and 212, The bevel groove apex 501a of the lens frame 501 is the ridgeline 2 of both hands.
19 and 220 are automatically positioned on the reference plane S.

Next, by rotating the guide shaft rotation motor 209 by a predetermined angle, the frame holding device section 100 turns to the position shown by the two-dot chain line in FIG. Stops 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 section 100 by a certain amount in the Y-axis direction, thereby rotating the circular opening center point 159a of the frame holding device section 100 and the measuring section 300. The center of the axis 304 is approximately aligned.

At this time, the bevel feeler 356 comes into contact with the bevel groove of the lens frame 501 during the movement.

The initial position of the bevel feeler 356 is shown in Fig. 5 (A>,
As shown in (B), a pin 352a implanted at the lower end of the sensor shaft 352 is attached to the base 31 of the sensor arm portion.
Its direction is regulated by contacting the hanger 310a attached to the holder 310a. Thereby, when the eyeglass frame 500 moves due to the rotation of the Y-axis motor 224, the tweeter 356 can always remain in the bevel groove.

Subsequently, the motor 301 is rotated every predetermined number of unit rotation pulses. At this time, the sensor head section 312 moves on the rails 311 and 311 according to the shape of the glasses frame 500, that is, the radius of the lens frame 501, and the amount of movement 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 (ρn).

θn) (n=1.2.3-N).

Here, as described above, the first measurement was performed with the center ◯ of the rotation axis 304 approximately coinciding with the geometric center of the lens frame 501, as shown in FIG.

The second measurement is based on the first measurement data (ρn.

Day, evening (xn
.

The maximum value in the X-axis direction from the measured point B (Xb,
yb), the measured point D (Xd,
yd), the measured point A (Xa
, ya ) and the measured point C(
Xc, yc) and find the geometric center Oo of the lens frame as (1). Based on these XO, yo values, the X-axis motor 206 and Y-axis motor 224 are driven, and the hand 21
1,212 is moved, thereby aligning the geometrical center 00 of the lens frame 501 with the rotation center O of the sensor arm 302, and measuring the lens frame shape again, the geometrical center Oo Measured value (O
Find ρn, oθn) (n=1:2:3・N).

When measuring the lens frame shape based on the above-mentioned geometric center 00, the sensor 358 moves the sensor head 3 in the Z-axis direction.
12 movement amounts are also measured at the same time.

As a result, the lens frame shape is (0ρ0.○θn, Zn
) (n=1.2.3--N) three-dimensional information is obtained.

In the measurement of the radius vector of the lens frame 501 described above, if the bevel feeler 356 comes off from the lens frame 501 during the measurement, as shown by e in FIG. Since it deviates greatly from the data, a radial change range a is determined in advance, and when it deviates from that range, the rotation of the sensor arm 302 is stopped, and at the same time, the electromagnetic magnet 318 of the spring device 315 shown in FIG. 4 is excited. Then, the tsuba 321 is attached.

As a result, the clutch plates 324 and 325 are connected to the mainspring spring 3.
16 and prevents its winding action, it is possible to prevent the arm 355 of the sensor head section 312 from getting caught on the lens frame and damaging the glasses frame 500. After such a deviation of the tweeter 356 occurs, the glasses frame 500 is returned to the initial measurement position and the measurement is performed again.

FIG. 8 shows the configuration of a template holding member 100 for measuring the shape of a template 510 that is molded from a lens frame 501 of an eyeglass frame 500 by copying. The template holding member 110 is composed of an arm portion 111, cylindrical columns 112 and 113 attached to both ends of the arm portion 111, and a holding column 120 attached to the center of the arm portion 111. A thick pin 116 at the center and thin pins 114 and 115 are installed on both sides of the tip end face of the holding column 120.
The template 510 is attached to the holding column 120 by 14-116.

The support columns 112 and 113 of the template holding member 110 are held by the hands 211 and 212. and hand 21
1. When 212 is lowered to the measurement position, the template 510 is positioned in the same plane as the template contact surface 354 of the sensor part 312, and the template contact surface 3 is moved by the movement of the hands 211 and 212.
54 comes into contact with the side surface of the template 510, and the sensor arm 30
2, its radius vector (tρnetθn) is measured.

FIG. 9 is a block diagram showing the arithmetic and control circuit of the frame shape measuring device of the present application. Driver circuits 601 to 6
04 are the X-axis motor 206, the Y-axis motor 224, and
It is connected to the sensor arm rotation motor 301 and the guide shaft rotation motor 209. Drivers 601 to 604
controls the rotational drive of each of the pulse motors according to the number of pulses supplied from the pulse generator 609 under the control of the sequence control circuit 610.

The reading output of the reading head 313 is measured by the counter 605.
is counted and input to a comparison circuit 606. Comparison circuit 6
06 compares the signal corresponding to the radial change range a from the reference value generation circuit 607 with the amount of change in the count value from the counter 605, and when the count value is within the range a, the counter 60
5 count value ρn and the number of pulses from the pulse generator 609 are converted into the rotation angle of the sensor arm 355, and the value θn
A set of (ρn, θn) is input to the data memory 611 and stored.

Next, the sequence control circuit 610 switches the gate circuit 612 to the arithmetic circuit 613 side, and based on the first radius vector information (ρn, θn) stored in the data memory 611, the geometric center 00 of the lens frame 501 is is calculated and the data is input to the sequence control circuit 610. The sequence control circuit 610 calculates xO2YO from the above equation (1) based on the data from the arithmetic circuit 613, and calculates
1. Input the required number of pulses in 603 and start the motor 206.
, 224 to align the center of the lens frame 500 with the center of rotation of the sensor arm 302.

At the same time, the sequence control circuit 610 instructs the counter circuit 615 to count the data from the Z-axis sensor 358. Then, the lens frame shape information including the Z-axis direction data (0ρn.

0θn, Zn) and store this data in the data memory 6.
11 to be memorized. Here, if the count value ρn or Oρn from the counter 605 is larger than the radial change range a output from the reference value generation circuit 607, the comparison circuit 606 outputs this to the sequence control circuit 610,
Upon receiving this output, the circuit 610 activates the driver 608 to excite the electromagnetic magnet 318 of the spring device 315 to prevent the feeler 356 from moving and stop supplying pulses to the driver 604 to rotate the motor 301. prevent.

Lens frame shape information (0
ρn, oθn, Zn) are connected to the gate circuit 6 as necessary.
By switching 12, for example, it is determined whether or not the shape of the digital milling machine, molding machine, or frame is processed according to the design value, as disclosed in Japanese Patent Application No. 58-225197 previously filed by the present applicant. It is supplied to a determination device, etc.

Data memo! Lens frame shape information stored in 7611 (
If necessary, the curve value C of the lens frame can be determined by the arithmetic circuit 613 from the Zn information of (Oρn, oθn, Zn).

As shown in FIGS. 10(A) and 10(B), the calculation is based on vector radius ρ, ρ, at least two points a and b on the lens frame.
and the sensor head movement value ZA in the two-axis directions at these two points,
From Zs, the sphere SP including the bevel locus of the lens frame 501
The radius of curvature R is R2=ρA2+ (20ZA) 2 R2=ρB"+(20-2!l)' ・ (
2), and the bevel curve value C is calculated from the calculated R as C=-xlooo (3
) (where n is a constant and n=1.523).

Note that the sequence control circuit executes the above-mentioned measurement steps using a program stored in the program memory 614.

〔Effect of the invention〕

It is possible to digitally measure with high precision the shape of the lens frame of eyeglass frames and the shape of the template processed to imitate the lens frame. especially,
Since the measurement sensor arm rotates around the vertical axis to measure the shape, the sensor head is not affected by gravity during measurement, allowing for more accurate measurements.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a perspective view showing a frame shape device according to the present invention;
FIG. 2(A) is a perspective view showing the frame holding device;
Figures 2 (8) and (C) are longitudinal sectional views showing the operation of the holding device, Figure 3 is a sectional view taken along line A-A in Figure 2 (A), and Figure 4 is a view of the spring member. 5(A) is a schematic diagram showing the relationship between the support device part and a part of the sensor, FIG. 5(B) is a sectional view thereof, and FIG. 6 shows a part of the sensor. 7 is a schematic diagram showing the relationship of determining the geometric center from the measured values of the lens frame, FIG. 8 is a perspective view showing the template holding member, and FIG. A block diagram of an arithmetic/control circuit according to an embodiment of the present invention, Fig. 10 (^
) and (B) are explanatory diagrams of the calculation principle of the curve value C of the lens frame. 100-- Frame holding device 152... Holding frame 156... Slider 200 Supporting device section 211, 212-- Hand 300...- Measuring section 302 Sensor arm section Fig. 6 Fig. 10 (A) (B) ↑

Claims (2)

[Claims] (1) Consisting of a frame holding means for holding an eyeglass frame having a lens frame to be measured, a feeler that comes into contact with a bevel groove of the lens frame, and a detection means for detecting the three-dimensional movement amount of the feeler. A frame shape measuring device characterized by: (2) a frame holding means for holding an eyeglass frame having a lens frame to be measured; a sensor arm that rotates around a vertical axis that intersects a predetermined plane and whose axis is located within the lens frame; a sensor head that moves along the sensor head; a feeler that is attached to the sensor head so as to be freely movable along an axis substantially parallel to the vertical axis and that contacts a bevel groove of the lens frame; and a rotation angle of the sensor arm and the sensor head. and a detector for electrically detecting the amount of movement of the feeler in the direction along the sensor arm and the amount of movement of the feeler in the axial direction; and three-dimensional shape information of the lens frame (ρn, θn, Zn) Cn=1, 2, 3, . . . from the amount of movement of the sensor head and feeler.
A frame shape measuring device characterized by measuring N).