JPS6114848A - Grinding method of spectacle lens and its device - Google Patents

Abstract

PURPOSE:To automatically perform desired eccentric machining precisely with a ball grinder itself by grinding a lens based on the digitally measured lens frame radius information and the correction radius information determined from the eccentricity of the optical center of an unmachined lens. CONSTITUTION:The preliminary measurement of a lens press profile is again performed, the lens frame radius information rhon, thetan is dtermined using the geometric center of a lens frame as a rotation axis and is stored in place of the radius measured information at the initial center position. Next, the correction radius information crhon, Nn is determined by calculation using the optical center of the lens as an origin based on the eccentricity (e) added with each input eccentric data. Then, a grindstone is rotated at a high speed, the number of pulses N0 is fed to a motor 40 based on the radius angle information read out from the radius information memory, the lens axis is set to theta=0, and grinding is started. Next, when the ground quantity erho0 of the lens LE becomes equal to the lens frame measured radius crho0, the lens is removed, the radius information is read out, the axis is rotated by N1 pulses, the lens is ground again at the next radius angle, and the grinding is completed when machining radius measured value erho1=correction radius value crho1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a grinding machine for grinding a raw eyeglass lens to match the shape of a lens frame of an eyeglass frame.

In particular, the present invention relates to a method and apparatus for grinding an unprocessed lens when the geometric center of a lens frame and the optical center of a spectacle lens are not compromised.

[Prior art]

lIj! The optical center of a mirror lens needs to be aligned with the position where the optical center of presbyopia is located when the eyeglass frame is worn, and for this reason, the optical center of the lens is usually
1J? It is positioned eccentrically from the geometric center of the lens frame. Furthermore, if the prismatic effect of the lens is used to correct strabismus, it is necessary to further decenter the lens.

For this reason, conventional methods for grinding unfinished eyeglass lenses have utilized a suction cup mounting device for unfinished lenses and a template known by the trade name of pointsetter. Zunawara,
First, with the geometric center of the lens frame shape of the eyeglass frame and the geometric center of the unprocessed template matching, the unprocessed template is cut out and processed to follow the lens frame shape, and molded into a lens frame shape. Obtain a template.

Next, using a scale plate provided on the pointsetter, the optical center of the unprocessed lens is decentered by a desired amount, and the suction cup is attracted to the unprocessed lens.

Then, the unprocessed lens is held between the carriage shaft of the aperture machine and the suction cup. The mold plate is attached to this carrier, jig, and shaft. Since the centers of the mold plate and suction cup are installed so that they coincide with the carriage axis and the center of rotation, by grinding the unprocessed lens according to this mold plate, the unprocessed lens will have its optical center aligned with the geometry of the lens frame. Grinding is performed with the desired amount of eccentricity from the center.

[Problem that the invention seeks to solve]

As described above, the conventional method always requires a mounting device and a template, and the molding accuracy of the template is not necessarily high, and the work of decentering the unprocessed lens using the mounting device depends on the skill of the individual worker. However, despite the progress made in automation, faster processing speeds, and higher accuracy in processing, the forming of the template was difficult. In addition, suction work was still done manually and relied on the intuition and skill of the operator in many cases.

The present invention has been made in order to eliminate the drawbacks of the conventional eccentric processing method mentioned above, and includes a novel and useful eccentric processing method for a recessing machine that can automatically perform the desired eccentric processing with the recessing machine itself, and the method thereof. The goal is to provide equipment for

[Means for solving problems]

The structural feature of the present invention for achieving the above object is that the lens frame groove of the eyeglass frame or the radius vector information (ρn
, θn), and the lens frame radius vector information (ρ7.θ1) is calculated based on the eccentricity (ex, ey') of the optical center of the unprocessed lens. The step (and means) of obtaining corrected radial information (Cρ., Cθ.) with the origin at
The stage of grinding the unprocessed lens ( , , )
and means) for grinding an ffN mirror lens, and a grinding apparatus thereof.

〔Effect of the invention〕

According to the present invention, the conventional eccentric work is not required, and the lens grinding work becomes extremely simple. Furthermore, when directly digitally measuring the shape of a lens frame, there is no need for the molding work itself, which simplifies the work and improves accuracy.

[Explanation of Examples]

Kasa I ■ amount! FIG. 1 is a perspective view showing a grinding section of a grinding device, that is, a ball milling machine according to the present invention. A circular grindstone 3 consisting of a rough grindstone 3a, a bevel grindstone 3b, and a flat precision machining grindstone 3C is assembled in a grindstone chamber 2 of a housing 1, and this grindstone 3 is attached to a rotating shaft 5 having a pulley 4. The pulley 4 is connected to a rotating shaft of a grindstone motor 6 via a belt 7, and as the grindstone motor 6 rotates, the grindstone 3 is rotated.

A carrier shaft 12 is supported rotatably and slidably in the axial direction by a bearing 10.11 formed in the housing 1, and one end thereof is supported by a bearing formed in a feed base 20, which will be described later. 21a so as to be rotatable. Arms 14, 15 of a carriage 13 are fixed to this carriage shaft 12. Further, a lens rotation ring 18 for chucking and rotating the lens LE to be processed is attached to the arms 16 and 17. A chucking handle 19 is attached to one shaft 18a of the lens rotation wheel 18, and by rotating the chucking handle 19, the shaft 18a is slid in the axial direction, and the lens to be processed L
l? , chucking.

Further, the carriage shaft 12 is provided with a bowl portion 31 of a lens measuring device 30, which will be described later, so as to be able to swing coaxially with the swing axis of the carriage 13.
is installed.

Wheels 22 are attached to the base plate 21 of the feed platform 20, and the wheels 22 are removably placed on rails 23 attached to the housing l, thereby making the feed platform movable along the rails 23. keeping. The female threaded portion 24 of the feed base 2o is engaged with a feed screw 41 that rotates coaxially with the rotation axis of the motor 40, and the feed base 20 is rotated by rotation of the motor 40.
is moved left and right as shown by mark 25. As described above, this feed bar 20 is formed with a bearing 21a, and the carriage shaft 12 is attached to this bearing 21a, so that the feed bar The carriage 13 also moves horizontally due to the horizontal movement of the carriage 20.Furthermore, two parallel wooden shafts 26 and 26' are installed in the base plate 21 of the feed base 20, and a stopper member 27 is attached to the shafts so as to move vertically. The abutting member 27 has a t!i screw portion (8), and the feeder is fixed to the female screw portion 28 coaxially with the rotating shaft of the abutting feed motor 42. The screws 43 are engaged, and the rotation of the motor 42 causes the stopper member 27 to
It is configured to move up and down.

A rotating shaft 16b attached to the tip of an arm 16a protruding from the carriage 13 is in contact with the upper surface of the abutting member 27, and as the abutting member 27 moves up and down, the carriage 1
3 is configured to be swung.

28M is a perspective view showing an example of a measuring means for digitally measuring a lens frame of eyeglasses or a knife-shaped shape which is molded in advance in imitation of the lens frame of eyeglasses. arm 16 of carriage 13
The projecting shaft 18 of the lens rotation shaft 18 projecting to the outside of
b is fitted into a bearing 50 formed on the carriage 13. At the end 18C of the shaft 18b is one long side frame 5 of the detection arm J, 51, which is a rectangular rod-shaped frame.
2 is attached in a direction perpendicular to the rotation axis of the shaft 18h. A detector 54 is slidably attached to the other long side frame 53, and this detector is always pressed toward the end of the frame by a spring 59 inserted into the frame 53. Pulleys 57 and 58 are rotatably attached to the short side frames 55 and 56 of the detection arm 51. -1 axis 1
A pulley 60 is rotatably inserted in 8b, and a code plate 6 of an encoder 61 is coaxially connected to this pulley 60.
2 is permanently installed. The encoder detection rod 62a is fixed to the outer surface of the arm 16 of the carriage 13. One end of the first wire 80 is fixed to the detector 54 , and after being wound around the pulley 60 via the pulley 57 , the other end is fixed to the side surface of the pulley 60 . Also, the second wire 8
1 is fixed to the detector 54 at one end, wound around the pulley 60 via the pulley 58 in the opposite direction to the first wire, and then fixed at the other end to the side surface of the pulley 60. Thereby, the amount of sliding movement of the detector 54 on the frame 53 is read as the amount of rotation of the pulley 60, that is, the code plate of the encoder 61.

As shown in FIG. 3, the detector 54 includes a sliding seat 541 that is slidably fitted into the frame 53, and a sliding seat that is rotatable about the axis OI and in the axial direction of the shaft 01. and a slidably mounted detection feeler portion 542. The feeler part 542 includes a template detection contact 544 having a semicircular cross section and cut out in the rotating sliding shaft 543;
The lens frame detection peripheral contact wheel 546 is rotatably attached to the end of a substantially U-shaped arm member 545 attached to a rotational sliding shaft 543. A contact surface 544a of the contactor 544 and a contact peripheral surface 546a of the contact wheel 546 are both configured to be located on the axis O. A pin 547 is penetrated and fixed in parallel to the contact surface 544a near the other end of the rotating and sliding shaft, and this pin is attached to a locking member 548 attached to the long side frame 52 when the detector is in the initial position. The sides are in contact.

Inside the carriage 13 is a lens shaft rotation motor 70 and a sprocket wheel 7 that is rotated by the rotation of this motor 70.
It has a built-in sprocket axle 71 with 2.73 at both ends. Further, sprocket wheels 74 and 75 are provided on each of the lens rotation shafts 18 and 18a, a tune 76 is provided on the sprocket wheels 72 and 74, and a tune 76 is provided on the sprocket wheels 72 and 74, and a tune 76 is provided on the sprocket wheels 72 and 74,
3.75 is provided with a tune 77, respectively, and is configured to transmit the rotation of the motor 70 as rotation of the lens rotation axis.

On the other hand, the pedestal 91 of the eyeglass frame holding means 9'0 is mounted on the Tamazuri machine housing 1.
When the arm 1 is located at the initial position of the carriage 13,
6 is installed in a parallel relationship with the longitudinal direction. Two rails 92 and 93 are attached to this pedestal 91 in parallel with the longitudinal direction of the arm 16 of the carriage 13.
At 2.93, spectacle frame holder support members 94.95 are slidably disposed. Support members 94 and 95 are constantly tensioned by springs 96. Support member, foot portion 95a of 95
A feed screw 97a provided on the rotating shaft of the motor 97 is engaged with the feed screw 97a. Arms 94b, 95b of support member 94.95
The upper part is a clamping tool 9 for clamping the eyeglass frame holder 100.
It has 4C595c.

As shown in FIG. 2B, the eyeglass frame holder 100 includes a base plate 101 having a circular opening 102 in the center, and this base plate 1.
It is composed of eyeglass frame holding arms 103 and 104 that are slidably mounted opposite to each other on the eyeglass frame 01, and an equalizer 105 for holding down the eyeglass frame from above.

The eyeglass frame 200 is held between the upper and lower rims of the lens frame by the holding arms 103 and 104 so that the lens frame 201 to be measured is positioned above the circular opening 102, and the equalizer 10
Press step 5 to secure the lens frame.

At this time, the edge 105a of the front end of the equalizer 105
and the edge 105b of the rear end portion of the holding arm 103.
The front edge 101a and the rear edge 101b (not shown) of the base plate 101 are located on the same plane as the edges 105a and 105b, respectively.

The holder 100 holding the eyeglass frame 200 in this manner is held by the holding tools 94C195C. Here, the equalizer 1
05 rear end 105b and base plate rear edge 101b
The base plate 101 is separated from the base plate 101 by the same distance d,
Equalizer 105 and notches 103a and 104a are configured. On the other hand, the clamping tools 94c and 95c are
d, 95d are formed, this clamping tool 94C1
When the holder 100 is held between the holders 95c and 95c as shown in FIG. 2C, the edge 105b of the rear end of the equalizer 105
The rear edge 101b of the base plate is automatically held in contact with the slope so that the center of the contact interval is flush with the center of the slope groove. As a result, the bevel center center 201b of the lower rim of the lens frame coincides with the center of the slope groove of the clamping tool 94C195C.

When supporting the template with the above-mentioned eyeglass frame holder support members 94 and 95, a template holder 110 is used as shown in FIG. The template holder 110 includes a support frame 111, cylindrical members 112 and 113 attached to both ends thereof, a template mounting column 114 planted in the center of the support frame 111, and a template mounting column 114 planted on the end face of this mounting column. Bin 114.115
．． 116. The template 210 has holes pre-formed therein to accommodate the bins 114, 115.
116 to be attached to the mounting post,
This template holder is supported by being held between supporting members 94 and 95.

Next, the measurement of eyeglass lens frames by the measuring means having the above-mentioned configuration will be explained below.

The eyeglass frame holder 100 is held between the support members 94 and 95, and the motor 40 moves the carriage 13 in the direction of arrow A (see FIG. 1).
After moving the holder 100 by a predetermined amount in the direction of the rail 92., the motor 97 is rotated so that the lower groove 201 of the lens frame 200 at the initial set position and the contact wheel 546 contact on the same plane. 93 by a predetermined constant amount so that the rotation center 02 of the detection arm 51 is located within the lens frame. At this time, the lens frame 200
The lower groove 201 hooks the contact wheel 546 and at the same time the pin 547 is released from the locking member 548 and the rotating sliding shaft 54
3 can be rotated freely. The amount of movement of the detector 54 on the frame S3 is converted into the amount of rotation of the encoder by wires 80 and 81.

Now, as shown in FIG. 2A, when the carriage 13 and the detection arm 51 are in the initial position, the detector 54 is not in contact with the eyeglass frame but is in the initial position as shown in FIG. The origin 100 is set on the line of the axis OI, and the distance from this origin 100 to the rotation center 02 of the detection arm 51 is p.
The count value of the encoder due to the above-mentioned quantitative movement of the eyeglass frame and the movement of the detector accompanying the rotation of the detection arm is set to 01, and the resolution of the encoder is e'/puls.
e, the resolution calculated by converting the amount of movement of the detector at this time is d
(+n) /pulse, so that the detection arm 51 is parallel to the arm 16 of the carriage 13 at the above-mentioned initial position, and if this is set as a reference angle of 0°, the detection arm 5
In this embodiment, the radius vector ρ1 of the lens frame at the rotation angle θ7 of 1 is a shape that also includes the amount of rotation of the detection arm when the amount of movement of the detector 54 on the detection arm 51 is detected by the encoder 61. Therefore, it is given as θ1 ρ, l−(C,−−)d (1). Note that according to the tit formula, θ7=0, that is, the vector radius ρ at the reference position. is ρ. = j! -Cod......(2) is given as.

In this way, if the detection arm 51 is rotated around the entire circumference of the lens frame, the lens frame 200 at the rotation center 02
Shape information (ρ7.θn) (where n=o, 1.2.3
, --·N) are obtained as digital values. This (ρ7
．． θfi) is data when the rotation center of the detection arm 51 is located at an arbitrary position o2 of the lens frame, and is not data when the rotation center is located at the geometric center of the lens frame 200. A method for correcting this will be explained based on the schematic diagrams shown in FIGS. 6A and 6B.

The straight line connecting the rotation center o2 of the detection arm and the swing center O of the carriage when the carriage 13 is in the initial position is Y.
Take an X-Y orthogonal coordinate system with the axis perpendicular to this axis as the X axis, and convert the lens frame measurement data (ρ0.θ,) into the polar coordinates-orthogonal coordinate conversion formula to obtain the orthogonal coordinates. value. Lens frame data in orthogonal coordinates (xn
, yn), the minimum value coordinate point A (xa = )'m) and the maximum value coordinate point C (Xc
, Yc ), the minimum coordinate point D (Xd, )', ), and the maximum coordinate point B (xb, yb) in the direction parallel to the Y-axis direction, and the geometry of the lens frame given from these Find the center ○. Center of rotation at initial measurement 0□(
Xo + yo) and the center 03 determined by equation (4)
(X3,)'3) difference χ. -x3=Δ8・yoYz
=Δ, and the motor 97 rotates to move the eyeglass frame holding means 90 by a distance of Δ. Further, Δ8 is given by the amount of swing of the carriage 13. This swinging motion is given by the amount of vertical movement of the abutting member 27. In this embodiment, the swing radius of the rotation center of the detection arm is M, and the rotating wheel 16b is
Since there is a relationship of M=2m with the swing radius m to the contact point, ΔX#Mtanβ h! +;mtanβ Therefore △X”=, 2 h...(5
), by moving the stopper by the measured amount,
The center of rotation of the detection arm is aligned with the geometric center 03 of the lens frame. Next, the detection arm 51 is rotated by an angle β to correct the origin. With the detection arm 51 thus positioned at the geometric center of the lens frame, the detection arm is rotated again over the entire circumference and the detector detects the shape information (ρn) of the lens frame.
, θn) as digital values and then store them.

Figure 7 is a schematic diagram showing a method of measuring the shape of a template when a template is used instead of a lens frame.

Components that are the same as those in FIG. 5 described above are designated by the same reference numerals, and the following explanation will be omitted. In the case of template measurement, the shape of the template is measured by bringing the template detection contact 544 into contact with the peripheral surface 211 of the template 210 and rotating the detection arm 51. In order to place the rotation center 0□ of the detection arm 51 within the template, it is moved a predetermined distance from a predetermined origin.

Also, the detection arm is at the angular position θ. The dynamic radius Lρ0 when located at is t pn - (Cn-121) d -12・-・(6
) and the reference angle θ. dynamic radius t at
ρ. is tρ. =C(1d-7!...(7)).

Template shape information (tρn, θn) (n=
Determining the geometric center of the template based on 0.1.2.3-...N), moving the rotation center of the detection arm to that position, remeasuring, and storing the data is as described above. This is similar to the case of lens frame measurement.

In this embodiment, as shown in FIG. 3, the contact point 546a of the contact shaft 546 inscribed in the groove of the lens frame and the contact surface 544a of the tooth-shaped contact 544 are both aligned with the rotational axis of the rotational sliding shaft 5430. During measurement, the contact shaft 546 or the contactor 544 receives contact pressure, and the arm member 545 rotates the rotating and sliding shaft so that it is located in the normal direction of the contact surface at the contact point. This allows accurate measurements to be taken at all times.

Normally, when wearing a spectacle frame, the optical axis of the presbyopia and the geometric center of the lens frame do not coincide, so when the lens is assembled into the lens frame after grinding, the optical axis of the lens It is necessary to eccentrically process the lens so that it coincides with the optical axis of the presbyopic lens. Therefore, the lens frame radial information is corrected based on the eccentricity between the geometric center of the lens frame and the optical axis of the lens, which is known as the so-called "adjustment amount" (hereinafter referred to as "geometric eccentricity"). There is a need.

Furthermore, when worn presbyopia is strabismus and the prism effect of the worn lens is used to correct the strabismus, then: It is necessary to add the amount of prism eccentricity, C, to the above-mentioned geometrical eccentricity, e, and the eccentricity e becomes e-, le+9e. Normally, the amount of eccentricity e is the horizontal direction (X-axis direction) and the vertical direction (
(Y-axis direction) and set the "Inner (Outer) Amount" eX, "Upper (
Bottom) To express it as the amount of deviation Jey, the amount of eccentricity e is expressed as.

Now, as shown in FIG. 8, when the geometric center O1 of the lens frame 200 is set as the origin, the lens frame 200 is divided into an evenly divided angle θ
Rotate the detection arm every 6 times (measured point P,
, (n=o, l, 2.3...H, i+1.i+2.
...j...N) radius vector information as (ρ7.θn)(n
=o, 1.2.3...i, i→1. j+2.・・・
゛...N), and the coordinates of the measured point P in the X-Y coordinate system of the origin 03 are (
Xi, Yi) is expressed as.

Now, when the optical center O0 of the eyeglass lens is decentered by the eccentric amount (e, , e, The coordinates of P (Xi', Yi') are as follows, and from this, when the eccentric optical center 0° is the origin, the measured point p,
Corrected radial information (Cρ,.

Cθ, ) is It is required as.

As described above, the radius vector angle θ of the measured point P when the geometric center O1 of the lens frame is the origin is θ, −θ3. l
=θ1.1-θ, +2-...-θJ-1-θ1=...
.=θ□, −θ8−θ, and the change is configured to change by an equal amount for each equal division angle θ0. However, the radial angle Cθ of the measured point P when the optical center O0 is the origin changes unevenly. So now, considering a unit minute angle △θ, and dividing the corrected radial angle Cθ by this unit minute angle △θ, we get CθI/△θ=N.

It is expressed as Therefore, if the amount of pulses to the carriage shaft rotation motor 70 necessary to rotate the lens by 66 minutes is defined as a unit pulse amount (for example, 1 pulse), then the corrected radial angle Cθ is the amount corresponding to the number of pulses N8. Therefore, the corrected radial information (Cρ, Cθ) is (Cρ,,N,,)(i・0.1.2.3...N)・
... (12) Therefore, it is sufficient to supply this number of pulses N3 to the carriage rotation motor during lens grinding.

The above correction principle is based on the lens frame radius information (
ρ6. θ. ) has its origin at the geometric center of the lens frame 0. Although the description has been given as an example, the present invention is not necessarily limited to this. As shown in FIG. 9, the origin 0□ of radial information measurement of the lens frame is its geometric center 0. From (△
8. Even if the measurement is performed at a position shifted from Δy), the coordinates of the measured point P1 in the x-y coordinate system at this origin 02 are
. Therefore, the corrected radial information (Cρ, ′, Cθ
8′) is expressed as, using the unit infinitesimal angle △θ, Cθ,′/△
Since the number of pulses of θ=N,'...(15) can be found, the lens frame radius information (ρ.', 07') at the origin 0□ is the radius radius information with the optical center O0 as the origin. It can be obtained as (Cρn'+N,,').

Grinding work Next, the configuration and operation of grinding an unshaped lens based on the measured value of the radius vector information of the lens frame or template with the optical center as the origin will be explained based on Fig. 10. . The unshaped lens is chucked by the lens rotation axis 18.18a (see Figure 1) so that its optical center is coaxial with the carriage rotation axis, and the grindstone rotation motor 6 is driven to rotate the grindstone 3 and the unshaped lens is unshaped by the weight of the carriage. The orthopedic lens is pressed against a grindstone 3 and processed.

In the present invention, the unshaped lens LE has the above-mentioned corrected radius radius information (Cρn, J) (n=0.1.2.3) of the lens frame or template.
...N) or (Cρ r.

N') (n=o, 1.2.3...-N) is processed according to the numerical data given. Carriage swing amount 7! , a linear encoder 610 is used in this embodiment.

This encoder is composed of a scale 611 whose one end is rotatably attached to the side of the arm 31 of the member 30 around a fulcrum P, and a detection head 612 which is also rotatably attached to the side of the carriage 13. ing. The rotation angle T of the carriage given by the carriage swing amount 17 is also the same angle as the rotation angle γ of the detection head 612. Movement of the detection head as the carriage rotates is detected as a read value on the scale. Here, in this example, scale 61
1 is rotatable around the fulcrum P, so the distance between the reading values elzez of the detection head is actually the distance M between el' and e2.
Give C. On the other hand, since the lower length of the string stretched at the carriage rotation angle γ of the circular arc 613 whose radius is the distance MR between the carriage rotation axis 12 and the fulcrum P is designed to be the same length as the aforementioned distance MC, the encoder The reading amount of 610 directly becomes the length of the chord of the rotation angle amount T of the carriage, and its 2
Double the amount of vibration! ! , is configured so that In this way, while checking the progress of machining from time to time with the encoder 610, the N1 pulse is first input to the motor 70, and when the radius vector Cρ is machined at the radius vector angle of the rotation angle Cθ8 corresponding to the pulse, the abutting member The female screw portion 28 of 27 is the rotating ring 166
to stop further machining, and then input pulses to the lens shaft rotation motor 70 until the N pulse is reached, rotate the lens rotation shaft, and move the lens to the position of the radial angle Cθ3.1. LE is rotated and its radius vector value Cρ1. ．． Process the lens LE until it is obtained. This is the previous corrected radial information (cρ,, N, 1) (n=o, 1.2.3...N)
For all of the above, detailed lens processing is performed based on the iteratively corrected radial information.

Operation of the Drilling Machine FIG. 11 is a block diagram showing the electrical system of the drilling machine of the present invention, and FIG. 12 is a flowchart showing its operating sequence. The operation of the ball milling machine of the present invention will be explained below with reference to both figures.

(1)) Lens frame measurement step step 1-1 = When a start command is input, the arithmetic control circuit +300 consisting of a microprocessor controls the motor control cycle B 1100 of the carriage according to the program stored in the Noken program memory 1400. The feed motor controller 1105 is controlled, and the carriage feed motor 40 is rotated by the required amount with pulses from the pulse generator, and the detector 54 of the lens frame measuring device attached to the carriage 13 is moved to the eyeglass frame holding device.

Step 1-2 = Y-axis motor controller 1103 generates pulse 131
The pulses from 200 are sent to the Y transport motor 97 of the lens frame holding device 90, and the lens frame 200 is rotated by the number of pulses, and the lens frame 200 is moved. A corresponding number of unit pulses, for example 20 pulses, are sent to the lens shaft rotation motor 70 and are divided into equal division angles θ.

The detection arm 51 is thereby rotated. The detector 54 on the detection arm follows the lens frame with which it is in contact, and moves on the arm along its radius vector,
The amount of movement is detected by an encoder 61, and the detected signal is counted by a ρ counter 1001.

The count value of the ρ counter 1001 is stored in the radial information memory 1002.
is input to. The memory 1002 stores the equal division angle θ from the lens axis rotation motor controller. Since each pulse is input, the radial count value F. is the rotation angle θ of the detection arm
, make a pair with (β-1, θ, l) (n=
o, 1, 2, 3...N). This step is used as a preliminary measurement of the shape of the lens.

Step 1-4: Based on the preliminary measurement radius information stored in the radius information memo I71002, the arithmetic control circuit 1300 calculates the equation (3) and the equation (
4) Find the geometric center of the lens frame according to 2. Next, in order to position the rotation axis of the detection arm 51 at the geometric center, the stop motor controller 1102 is controlled, and the pulse generator 1200 supplies pulses corresponding to the amount of movement ΔX to the stop motor 42. , are driven to move the carriage ΔX. At the same time, the arithmetic control circuit 130
0 controls the Y-axis motor controller, supplies a pulse corresponding to ΔY to the Y-axis motor 97, and moves the eyeglass frame holding device to Δ
Move only X.

Step 1-5: Execute Step 1-3 above again to obtain lens frame radius vector information (ρ7.θ
. >(n=0.1.2.3...N), and use the value as the radius measurement information (T7.θ, ,) at the initial center position.
Replace it with and memorize it. This step is the main measurement of the radius vector information of the lens frame.

(2) Eccentricity data inputted by the operator using the prism eccentricity input device 1501 and the geometrical eccentricity input device 1502 of the eccentricity input device 1500 are added in an adding circuit 1503, It is input to the arithmetic control circuit 1300 as the eccentricity e. The arithmetic control circuit 1300 calculates the (
Corrected radial information (Cρ1°N, ) (n=
0.1.2.3--N) is calculated.

(3) Yan's grinding step steno knob 3-1: arithmetic control circuit 1300, grinding wheel motor controller 11
04 is turned ON to rotate the grindstone motor 6 and rotate the grindstone at high speed.

Step 3-2: Next, the carriage transport motor controller 1105 supplies a predetermined number of pulses from the pulse generator 1200 to the motor 40, and the carriage can be moved so that the lens LE is positioned above the rough grindstone 3a.

Step 3-3: The arithmetic control circuit 1300 reads (
Cρゎ, No) data, and this radial angle information N,
According to (No=O), the number of pulses of No is supplied to the motor 40 via the lens shaft rotation motor control: ] 101, and the lens shaft is positioned at the start position of θ-0.

Next, the abutment motor 42 is rotated via the abutment motor controller 1102 to lower the abutment.

As a result, the carriage 13 is lowered, the lens LE is brought into contact with the rough grindstone, and the grinding process is started.

The amount of grinding progress of the lens LE, that is, its machining radius eρ is read by a linear encoder 610. The detection signal of the linear encoder 610 is counted by the ep counter 1600, and the counted value eρ. is memo 1 in the arithmetic control circuit 1300.
Lens frame measurement radius Cρ read from month 002. compared to and eρ. =Cρ. When this occurs, the abutment motor controller 1102 is operated to reverse the abutment motor 42, the abutment is raised, the carriage is raised, and the lens LE is separated from the grindstone.

Step 3-5: Next, the arithmetic control circuit 1300 reads (Cρ
1. The pulse generator 120 reads the radial information of the
0 to N pulses are supplied to the motor 40, the lens axis is rotated by that amount, and the lens is positioned at the next radius vector angle.

Next, the stopper motor 42 is rotated again to lower the carriage, and lens grinding is resumed.

Then, the arithmetic control circuit 1300 compares the machining radius vector count data eρ from the eρ counter 1600 with the corrected radius vector value ■Cρ1 read from the memory 1002, and eρ
, = (When ρ1 is reached, the abutting motor is reversed and the lens LE is released from the grindstone.

Thereafter, this step is executed until (CρN, NN), and the lens is ground over the entire radial angle.

(4) Bevel processing After finishing the grinding process in the above steps, the arithmetic control circuit 1
300 is next a carry and feed motor controller 110
The motor 40 is rotated via 5, and the carriage is further moved by an axial force Iii), and the lens LE is positioned on the bevel grindstone 3b.

Next, the stopper motor 42 is rotated to lower the carriage, and the lens LE is brought into contact with the beveling grindstone to start bevel processing. Thereafter, beveling is performed over the entire radial angle until the corrected radius vector Cρ and the machining radius eρ0 become equal.

When the execution is completed, the carriage returns to the initial position, the rotation of the grindstone 3 is stopped, and the work is completed.

In addition, when the principle of eccentricity correction explained in FIG. 10)' to (15) are executed.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of a ball-sliding machine according to the present invention;
Figure 2A is an exploded perspective view showing the lens frame measuring device, Figure 2B
The figure is a perspective view of the lens frame positioning device, FIG. 2C is a front view thereof, FIG. 3 is a side view partially showing the structure of a detector for lens frame measurement, and FIG. 4 is a template measuring device. Perspective view,
FIG. 5 and FIGS. 6A and 6B are schematic diagrams showing the lens measurement operation, FIG. 7 is a schematic diagram showing the template measurement operation, and FIGS. 8 and 9 are schematic diagrams showing the principle of correcting radius vector information. FIG. 10 is a diagram showing the relationship between a carriage and an encoder during lens processing, FIG. 11 is a block diagram showing the electrical system of the present invention, and FIG. 12 is a flowchart showing the processing operation. 51...Detection arm, 54...Detector, 61...
Encoder, 18.18'... Lens rotation axis, 97.
...Y-axis motor, 27...stop, 1500...
Eccentricity human power device, 1300... Arithmetic control circuit, 1002... Radial information memory Fig. 2C Fig. 5 Fig. 7

Claims (2)

[Claims] (1) Digitally measuring the radius vector information (ρ_n, θ_n) of the lens frame groove of the eyeglass frame or a molding plate that has been previously processed into a shape corresponding to the lens frame shape by imitating the lens frame groove, and the lens frame radius vector information (ρ_n, θ_n) based on the eccentricity (e_x, e_y) of the optical center of the unprocessed lens,
Corrected radial information (cρ_n, cθ
A method for grinding an eyeglass lens, the method comprising: obtaining the corrected radius vector information (cρ_n, cθ_n); and grinding an unprocessed lens based on the corrected radius vector information (cρ_n, cθ_n). (2) means for digitally measuring radius vector information (ρ_n, θ_n) of a lens frame groove of an eyeglass frame or a molding plate that has been previously processed into a shape corresponding to the lens frame shape by imitating the lens frame groove; and the lens frame radius vector information. (ρ_n, θ_n) based on the eccentricity (e_x, e_y) of the optical center of the unprocessed lens,
Corrected radial information (cρ_n, cθ
_n); and means for grinding an unprocessed lens based on the corrected radius vector information (cρ_n, cθ_n).