JPH0265960A - Eyeglass lens peripheral chamfering device - Google Patents

Abstract

PURPOSE:To make the beveling depth of the both side angular parts of the lens to be worked almost constant by providing a control circuit controlling the beveling depth of both side angular parts by controlling the lift and driving of a carriage based on the information of the memory which stores the edge thickness of the lens to be worked corresponding to each radius vector based on the output signal transmitted from an edge thickness measuring means. CONSTITUTION:A control circuit 108 ascends a fitting part 54 up to specified height by a driving device, controlling a die receiving base 38 by its lifting according to rhoi based on the eHt of the 7th memory of a memory 100 as well and executing beveling at the both side angular parts of the V part of the lens to be worked. In case of this beveling, the die receiving base 38 ascends a beveling grindstone by hw from the position of the height Lx via the lens to be worked, ascending a rocking arm upward a little and separating a stopper from an arm stopper receiver by ascending it by HW. In this state the beveling grindstone is press-fitted by the gravity of the rocking arm side to the both side angular parts of the V part of the lens to be worked.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an eyeglass lens peripheral edge chamfering device used for chamfering both side corners of an eyeglass lens.

(Prior Art) Generally, in order to attach a spectacle lens to a lens frame of a spectacle frame, it is necessary to bevel or groove the peripheral edge of the spectacle lens. FIG. 9 and FIG. 1O schematically show the principle of beveling a fabric lens. This Figure 9.

In Fig. 10, when processing an acute bevel with a radius of curvature Re on the peripheral edge of the lens L, the distance between the lens rotation axis oL on the meridian A with the vector radius γ^ and the bevel grinding wheel E is a^, and the horizontal movement position of the lens L is Y^.

In this fabric lens L, when the bevel part with a radius of 1 curvature Re is also placed at a position corresponding to the meridian B, the distance between the axes of 1 g in the conventional beading machine is Ωtr=Q^-x=Q^-(γ^ −γ
In addition to changing only B), the lateral movement position of the lens L was moved by y to Y8.

An example of an apparatus for chamfering the corners on both sides of the bevel portion of such a lens L to be processed is shown in FIG. 11.

There is a lens peripheral processing machine as shown in FIG. 12 (see Japanese Patent Application Laid-Open No. 15964/1983).

In this lens peripheral processing machine, the lens 4 to be processed is held between the lens shafts 2 and 3 of the main body 1, and the lens shafts 2 and 3 are rotated at low speed, while the cutting blade 6 driven by the motor 5 is By moving the cutting blade 6 to the 4 side and controlling the pressure contact with the curved surface of the lens 4 to be processed, the shape of the lens 4 to be processed is roughly cut into the shape of the lens frame of the glasses frame to be mounted.

In addition, the bevel grinding wheel 7 is moved over the lens 4 to be processed which has been roughly cut in this way, and the bevel grinding wheel 7 is rotationally driven by the motor 8, so that the bevel grinding wheel 7 is attached to the peripheral edge of the lens 4 to be processed. By applying light pressure to the lens 4, a bevel portion is formed on the peripheral edge of the lens 4 to be processed, as shown in FIG. Note that during this processing, the lens 4 to be processed is rotated by the lens axis 2°3, so the length of the lens 4 to be processed up to the point of contact with the bevel grinding wheel 7, that is, the radius vector changes with the rotation. However, with this change in radius, the bevel grindstone 7 is vertically swung by the swingable arm 9.

The lens 4 to be processed which has been beveled in this manner has corner portions a and b on both sides of the bevel portion 4a.

In order to chamfer the corners a and b, in the lens peripheral processing machine described above, the angle θ of the V groove A is lower than that of the bevel grinding wheel 7.
A chamfered grindstone G with a small chamfer is used.

This chamfering grindstone G is attached to an output shaft of a motor, and a support plate SP that holds this motor A is attached to a support shaft SA so as to be rotatable and movable in the axial direction.

(Problem to be Solved by the Invention) By the way, in such a lens peripheral processing machine, the operator presses the support plate SP by hand to bring the chamfering grindstone G into pressure contact with the bevel portion of the lens 4 to be processed. By this, the corner a,
I am trying to chamfer b.

However, since the amount of chamfering is determined manually by the operator while visually observing the chamfering amount, there is a problem in that skill is required.

Further, since the chamfering of such corners a and b was performed separately, there was a problem in that the chamfering work took a long time.

Therefore, the present invention provides a peripheral edge chamfering device for eyeglass lenses that does not require any skill to chamfer the side corners of the bevel portion of a lens to be processed and can shorten the chamfering work time. The purpose is to provide

(Means for Solving the Problem) In order to achieve this object, a carriage is mounted on the main body so as to be movable up and down and movable laterally; a pair of lens shafts are mounted on the carriage in a lateral direction; an edge thickness measuring means for measuring the edge thickness of the peripheral edge of the lens to be processed, which is held between a pair of lens axes, in correspondence with each vector radius; A memory for storing edge thickness in correspondence with each radius, and a memory disposed above the lens axis so as to be rotatable about an axis parallel to the lens axis, and movable up and down with respect to the lens to be processed. a chamfering grindstone attached to the main body; a stopper for regulating the height of descent of the chamfering grindstone relative to the main body; The present invention is characterized in that it has a control circuit that controls the drilling depth.

(Example) Embodiments of the present invention will be described below based on the drawings.

111'' Figures 1 to 6 show a first embodiment of the present invention. FIG. 1 is an external perspective view showing a part of the structure of a lens processing device, that is, a bevel machine and a structure of a chamfering device according to the present invention, together with an electric circuit block diagram of a beveling control system and a chamfering control system. It is a diagram.

A grindstone chamber 11 is provided in the casing 10, and a grindstone rotated at high speed by a motor (not shown) is stored therein. This whetstone is composed of a rough whetstone 12 and a bevel whetstone 13. A bearing 14 is provided after the housing 10, and this bearing 1
A carriage pivot shaft 21 is fitted into the shaft 4 so as to be rotatable and movable in the axial direction. A rear end portion of the carriage 20 is fixed to this carriage pivot shaft 21 . As a result, the carriage 20 can be turned around the carriage rotation shaft 21 and slidable in the axial direction. Projections 20a, 20 are provided on both sides of the free end of the carriage 20.
b, and the protrusions 20a, 20b hold lens shafts 22a, 22b coaxially disposed, and the lens L to be processed is sandwiched and held on the lens shafts 22a, 22b. There is. Further, the lens shafts 22a and 22b are rotated by a lens shaft motor 25 disposed within the carriage 20 via a known rotation transmission mechanism Q. A template T is attached to the other end of the lens shaft 22b by a known template holding means 24.
is installed.

On the side of the housing 10, there is an L-shaped arm member 30 serving as a carriage lateral movement means, and this arm member 30 is slidably supported by a shaft-shaped rail member 15 extending from the side wall of the housing 10. Further, a pivot shaft 21 of the carriage is attached to one end 34 of the arm member 30 so that it can rotate but cannot move laterally. The arm member 30 further includes a motor 32 (not shown) for lateral movement (Y axis) on the fixed frame side.
A feed screw 33 attached to the feed screw 33 is screwed together. and,
This rotation of the motor 32 causes the arm member 30 to move along the Y axis, and the movement of this arm member causes the carriage 2 to move.
0 is also moved by the same amount and in the same direction. A pulse motor 200 as an X-axis motor is held at the other end of the arm member 30, and a mold holder 38 having a structure to be described later is attached. This mold holder 38 has a mold placement main body 38b and a contact piece 38c for contacting the mold plate, and this contact piece 38c is connected to the shaft 2.
07 to one end of the mold holder main body 38b.

Moreover, the template T is the upper surface of the mold holder 38, that is, the mold receiving surface 38.
It is configured so as to come into contact with a. Here, the mold receiving surface 38a
has the same radius of curvature as the grinding line of the beveling grindstone 13.

Further, a spring 20 is provided between the mold holder main body 38 and the abutting piece 38c.
6 is interposed, and the abutment piece 38c has a mold plate T that is connected to the mold receiving surface 3.
When not in contact with 8a, it is flipped upward by a spring 206. Furthermore, a light shielding rod 205 is passed over the contact piece 38c. A pair of light emitting elements 204a and a light receiving element 20 are mounted on the upper surface of the mold holder 38, the light path of which can be blocked by the light shielding rod.
A detector 204 consisting of 4b is provided.

A female screw 203 fixed to the lower surface of the mold holder 38 is slidably inserted into a hole in the arm member 30 and is engaged with a feed screw 201 attached to a pulse motor 200 . Further, a guide rail 202 is attached to the lower surface of the mold holder main body 38b, and is inserted into a guide hole 208 of the arm member.

The main body 10 of the beading machine shown in Fig. 1 has the parts shown in Figs.
As shown in FIG. 2, the chamfering device main body 40 of the spectacle lens both side corner chamfering device is attached.

This chamfering device main body 40 has branch parts 41a, 41a at the bottom.
An arm support member 41 formed into two forks, and a branch part 4
1a, 41a, and lens shafts 22a, 22 attached to the upper end of the arm support member 41.
It has a support shaft 43 attached parallel to b, and a swing arm 44 rotatably held by the support shaft 43.

This swinging arm 44 includes a pair of side plates 45, 45, and a connecting shaft 4 that fixes the side plates 45, 45 in parallel with a space between them.
6.46 and the side plate 45 parallel to the lens axes 22a and 22b.
. An arm-side stopper 45a is provided at one end of the side plate 45.

In addition, the one-chamfer device main body 40 has a frame support shaft 47°47
A slide support member 48.48 is slidably attached in the axial direction with bearings 48a, 48a, and a slide frame 49 is fixed to the slide support member 48.48.
, a chamfering motor 51 fixed to the slide frame 49 with screws 50, a chamfering grindstone 52 detachably fitted to the output shaft 51a of the motor 51, and this chamfering grindstone 52 fixed to the output shaft 51a. It has a nut 53.

This output shaft 51a is provided parallel to the lens shafts 22a, 22b, and the chamfering grindstone 52 is a pair of chamfering grindstone members 52a, 5.
2b. As shown in FIG. 8(G), the inclination angle δ of the chamfered slope 52a' of the chamfered grindstone member 52a is set smaller than the inclination angle γ of the chamfered slope 52b' of the chamfered grindstone member 52b. This chamfering grindstone 52 is attached to the lens shaft 22.
a.

22b. This arrangement is 1 branch 4
1a and 41a are attached to the front wall 10a of the main body 10 of the beading machine in FIG. 8(C).

Fit the swing arm 44 to the lens shaft 22 as shown in (D).
a.

22b. Incidentally, the chamfering device main body 40 is removed from the main body 10 when copying and beveling the lens to be processed using a template.

On the other hand, in the main body 10, a stopper support (not shown) of the chamfering device is attached to the protrusions 20a and 20b of the carriage 20 from the upper surface.
A mounting portion 54 for mounting a fixed stopper is provided at the upper end of this stopper column. As shown in FIG. 8(E), this mounting portion 54 is formed with a mounting hole 55 that penetrates vertically, and a shaft portion 56a of an arm stopper receiver 56 is fitted into this mounting hole 55 so as to be vertically movable. A stopper screw 57 serving as a fixed stopper is screwed into the lower end of the mounting hole 55. This stopper screw 57 is fixed with a lock nut 58. In addition, the arm stopper receiver 56 and the mounting portion 54
A cushioning elastic member 59 made of rubber, synthetic resin, etc. is installed between the two. This elastic member 59 is compressed when the weight of the swinging arm 44 acts on the arm stopper receiver 56 via the stopper 45a, and the shaft portion 56a of the arm stopper receiver 56 comes into contact with the stopper screw 57 as a fixed stopper. It looks like you'll get it.

Further, in FIG. 1, numeral 100 is a bevel processing control device which is also used for drive control of such a chamfering device.

This beveling processing control device 100 detects! lh 204
A counter 301 that counts pulses from the pulse generator i 103 under control of a signal from the pulse generator i 103, an arithmetic circuit 106 consisting of a microprocessor that receives count data from the counter 301, and a memory for storing the arithmetic results of the arithmetic circuit 106. 110 and motor 25°32 during bevel processing
a control circuit 108 for controlling the calculation circuit 106, a calculation program memory 107 for storing calculation programs, a sequence program memory 120 for storing processing control sequences, and a curve input device 121 for inputting bevel curve values to the calculation circuit 106. , a determination circuit 302 for determining the amount of descent of the mold pedestal 38, a driver 104 used for driving the motor 32, a driver 102 used for driving the lens shaft motor 25, a driver 300 used for driving the pulse motor 200, etc. It is composed of 6 also. memory 1
10 includes first to fourth memories used for bevel processing and fifth to seventh memories used for chamfer processing.

The detailed configuration and operation of the bevel processing control device 100 and the chamfering device will be explained in the following operation description.

1. Lens step 1 In FIG. 1, the template T is attached to the lens shaft 22b of the carriage 20 shown in FIG. 1, and the carriage 20 is held in an initial fixed position as shown in FIG. shall be held in . In this state, if you turn on the switch LS to start lens shape grinding,
The control circuit 108 controls the driver circuit 300 to supply pulses from the pulse generator 103 to the pulse motor 200 to rotate the pulse motor 200 in the forward direction, thereby raising the mold pedestal 38.

At this time, the number of pulses supplied to the pulse motor 200 is counted by a counter 301.

When the contact piece 38c of the mold holder 38 contacts the mold plate T, the detector 204 outputs the detection signal to the counter 301 as a stop signal S, and stops the pulse coefficient of the counter 301. The counter 301 inputs the count value at that time to the arithmetic circuit 106.

Here, as shown in FIG. 3, the mold receiving surface 38 of the mold holder 38
a has a radius of curvature that matches the radius of curvature R of the bevel groove bottom 13a of the bevel grindstone 13, as shown by the two-dot chain line. The center of rotation of the lens L, that is, the lens axis 22a
, the movement of the mold holder 38 when the mold holder 38 rises and its mold receiving surface 38a contacts the template T, assuming that the predetermined distance between the rotation center OL of the 22b and the bevel grindstone groove bottom 13a is . If the amount is el, then the distance between the lens 23 and the rotating axis Oe of the bevel grinding wheel 13 is the distance between the axes, the distance between the lens axis and the grinding wheel is M, and the radius of the grinding wheel is R, so L=M+R is given. .

Then, the distance between the axes in the radius vector L of the template T.

is the amount of rise of the mold pedestal e [from Q L = (M' et) + R”'”' ”
' (7) (where i = 0, 1, 2, 3...
.j...N) in the arithmetic circuit 106, and the template radius vector A L corresponding to the first memory 111 of the memory 110 is stored at address A5.

When this is completed, the control circuit 108 then controls the driver 3.
00 to reverse the motor 200 to a predetermined 6
After lowering the mold pedestal 38 for 6 minutes, the motor 25 is rotated via the driver 102, and the mold plate T is rotated by a unit angle Δθ as shown in FIG. ! Position it on X. Then, when the template T is rotated by a unit angle, the control circuit 108 outputs a reset signal to the counter 301 to reset the counter 301. If there is a detection output from the detector 204 during this unit angle rotation, the determination circuit 30
2 receives the command and determines that the mold pedestal 38 has not descended below the length of the next radius vector A (, 1), and sends a notification to that effect to the control circuit 1.
Output to 08. The control circuit 108
Upon receiving the command from 2, the mold holder 38 is further lowered.

Further, when the lens shafts 22a and 2Zb are rotated by a unit angle, the motor 200 is rotated normally via the driver 300 again, the mold holder 38 is raised, and the distance between the axes Q5.1 of the radius vector 5.1 is
Measure. Hereafter, repeat this and the total template vector radius is 7t (
t,=Oe1.2,3.・・・・・・N), center distance 12L (here, shi=0.1, 2, 3...
・Find N).

Then, each axis distance (Qt) over the entire radius vector L is stored in the first memory 111 as P (address (
t=o, 1, 2, 3. ...N) respectively.

Step 2 Next, the arithmetic circuit 106 executes its arithmetic program memory 10
A stored in the first memory 111 according to No. 7. Read the center distance data (12 degrees) of the address, and calculate the radius vector from the radius R of the grinding line 13a of the beveling grindstone 13 and the center distance n0 as shown in FIG. Find the distance to the virtual machining point P0. That is, the straight line connecting the rotational axis center Oe of the bevel grinding wheel 13 and the rotational axis center oL of the lens shafts 22a and 22b is defined as a reference line X, and the intersection of this reference line Then, the arithmetic circuit 106 calculates the distance from the lens rotation axis center OL to the virtual machining points P [hereinafter referred to as the virtual machining radial length A (ΩJ)] as A L (+2J) = QL-R...・・・・・・(3)(
Here v, J=o, t, z, 3.・・・・・・・・・n
) for 0 steps, t, = 0. J=0
The radius vector specified as a. Virtual machining radius vector length, /', (12
0) is a from equation (3). It is determined as (no)=Qo−R.

Step 3 Next, the arithmetic circuit 106 calculates the distance Ω1 between the axes at address A1 of fliet (Ql, 1=Qi in this step) when the lens shafts 22a and 22b are rotated by the unit rotation angle. 1 Read from the memory 111 and calculate the radius vector at this center distance. The virtual machining radial length pa<n machining of the virtual machining point P1 is at(A")"Qj cos(jΔθ)+fl J"CO
8" (JΔθ) - (Q j2 - R") - (4) (where t, J = 0.1, 2, 3. - n, or - J, ≠ J)
using a. It is determined as (Ql)=Q1cosΔθ+Q, “cos”Δθ−(fl, “−R”).

In order to make it easier to understand this relationship, Fig. 4 shows that instead of rotating the template T by a unit angle Δθ, the bevel grinding wheel 13 is rotated by Δθ around the lens axis 01, and the grinding wheel grinding line 13a at that time is the same as that of the template T. It is shown as being in contact with T. Both of these notations indicate the same phenomenon.

Step 4 Next, the virtual machining radius vector length A [(12J
) and the virtual machining radius vector length A obtained in step 3, (Qj−x
) is compared at the 0-line stage since H = O, J = O, P, + (L) and /' o (nz) are compared. The "/" symbol in the flowchart in Figure 2 means to compare the values before and after it (the same applies below), and
A L (Q)) ≦ A LcQj*x), that is, A L (L) ≦
a. In the case of (Ql), the process moves to step IO, which will be described later. Also, a L(ΩJ)>P t(Q J-z), that is, a(n.)>a. In the case of (Ql), the process moves to the next step 5.

In the example of FIG. 4, PI, (Q,)>a. (Ql), so the process moves to the next step 5.

Step 5 The arithmetic circuit 106 reads from the memory 111 the inter-axis distance data (Ql) at address A2 of 1.2 (Uo, = U, in this step) when the template is further rotated by a unit angle Δθ. Using the above equation (4), calculate the virtual machining radius vector length a. (Ql)
seek.

Step 6 Virtual machining radial length PL (Q J ol) of step 4 and virtual machining radial length PLCQj-z' of step 5)
At the 0-line stage compared to , j=o and J=O, so a.

(Sad,) and a. Compare with (2□). And, A L
(Q J at)≦LL (When QJ is less, move to the next step 7 and set 7t (Q J , t)
J-z), the process moves to step 6'. In the example of FIG. 4, since P, (Q,) < A, (Ω,), the process moves to the next step 7.

Step 6' If in previous step 6 7t(Q, +-t)>AL(QJ,
z) That is, a. If you move to this step when (Ql>>1°(Ql), the center distance data (Q(J*x,
, zyO (J 411oz) center distance Q (J ax
)+2 to virtual machining radial length at(11(J+t,-a
) is required. And that is the previous data A L (Q
J12). The virtual machining radius vector length is sequentially calculated based on the center distance data one after another until the virtual machining radius vector length based on the updated center distance becomes larger than the virtual machining radius vector length of the previous center distance. Find out and compare.

Step 7 In the previous step 6, a L(12J ox)≦7t(Qj−z
), it is determined that A*(fi J at) is the machining radius length that is actually processed by the grindstone 13 at radius vector A (.In this stage, that is, in the example of FIG. 4, j=0 ．．
Since j=0, the radius vector is a. Machining radius length a. (Q
l) is determined.

Step 8 The arithmetic circuit 10 sets the machining motion length L (Q J , l) determined in the previous step 7 and the lens axis rotation angle Oj, 1 corresponding to the inter-axis distance Qj*1, and performs machining. The radial length data (LL, OL) is stored in the second memory 11 of the memory circuit 110.
2. In the example of FIG. 4, LL=at(Qj−t
) = a. (2□1)=Lt-OL=θ'', 1=θ. ,1
=01, the machining radius vector length (L, θ,) is the template radius vector A.

A of the second memory 112 corresponding to. The address is memorized.

Step 9 Total radius of template T, /' t(t, = o, 1, 2, 3...
. . . Steps 3 to 8 are sequentially executed for each radius vector L until the machining radius vector length is determined for n). For example, in the example shown in Fig. 4, radius vector a. The machining radius data (L machining, θ,) has been obtained for Step 7'
Accordingly, move from the radius vector pI to the radius vector A, execute steps 3 to 8 above for the new radius vector A, obtain the machining motion length regarding the radius vector A, and store the results in the second memory. 112 is stored at address P1 in correspondence with template radius vector A. Thereafter, in the same procedure, the machining radius vector length (L□θ,) for the final radius vector A is calculated and determined, and these are stored in the address A of the second memory section 112.

The relationship between the machining radius vector length data (S5.OL) and the template radius vector L is shown in FIG. The template T is the lens axis 22a.

When the lens is rotated around the axis 08 of the template 22b and positioned so that the template radius /'t, which is in the direction of rotation amount tXΔθ from the template reference line H, is located on the reference line The machining line 13a is lowered at the descending point PL, and the machining radius vector length of the machining line is LL, and the machining angle is θ.

Step 10 If pt(Qj)≦A((breath 4.1) in step 4, shift to one step and move the template T around the lens axes 22a and 22b as shown in FIG. A of the first memory 111 of the rotation angle on which is inverted to the unit angle,
The virtual machining radius vector length A (Ωj−1) is determined from equation (4) based on the center-to-axis distance Qn of the address. In the example in Figure 5, radius vector A. Using the center-to-axis distance Q O-1 = Q n, calculate the virtual machining radius vector length a. (Qn) a. (Qn)lln coa nΔθ+n” e08”
It is determined as nΔθ−(n−−R”).

Step 11 The virtual machining radius vector length A ((Ω)) obtained in Step 2 and the virtual machining radius vector L (n j−
t). Then, at(Q J)≦LL(A
j−□), move to the next step 12, and calculate pL(a
'')> If AL (Q J-t), the process moves to step 11'.

In the example of FIG. 5, j=o and J=O. (120) and a.

(Qo-t), that is, ao(Qn), is compared, and a.

(12,)〈A. (12n), the process moves to the next step 12.

Counting step 11' In the previous step 11, P L (Q J) > P t (Q J
-□), the process moves to this step, and the arithmetic circuit 106 further rotates the template T by a unit angle Δ
The inter-axle distance data when θ is reversed, that is, the new inter-axle distance QJ->, the inter-axle distance data (12(J-t
) −110cj−□)−□) center distance n(J−t+
-t (not shown) is used to calculate the virtual machining radius vector length AJ (Q (J-x 1-t)) using equation (4), and calculate the previous virtual machining radius vector length AJ (Qj-0 ).This operation is repeated until the virtual machining radial length sequentially updated in this way becomes smaller than the immediately preceding virtual machining radial length.

Step 12 In previous step 11, pt(12))≦AL(Q j-z)
When this happens, the process moves to this step. Then, the arithmetic circuit 10
6 determines the machining radius vector length data at (fij) which is actually machined by the grindstone 13 on the radius vector A L, and sets this distance between the axes to 0.6. is combined with the rotation angle θj of the template T corresponding to the machining radius vector length data (LL, OL).

In the example of FIG. 5, j=0. Since J=0 and these are determined as the machining radial length, the machining radial length data (LL, OL
) is LL=at(Q,+)=/'o(flo)=Lo,
OL=θj=θ. The data (Lo, θ.) is obtained, and in step 8, the data (Lo, θ.) is stored in the second memory 112. stored in the address.

When step 9 is executed, each radius vector L of the template T (L=
0.1, 2, 3. -n), machining radial length data (Lo
.

θ, ), (L,, θ1), (1*, θ-), (La-
θ3L""...(Lt+θL)...(L, ,
θH) is obtained, and these are the A1 address (t,=ttzt3,
......n).

Step 13 A known rough grinding process is performed using the rough grindstone 12 following the template T.

Step 14 The control circuit 108 selects arbitrary four template radius vectors a, ab, and a from the second memory 112. , select ad. The motor 25 is driven via the driver 102 based on the first template radius a, and the lens shafts 22a and 22b are moved (aX
Δθ) and align the radius vector of the template T on the reference line X (X-axis)
'a' is located.

Next, the control circuit 108 drives the motor 200 to lower the mold holder 38 and move the rough-ground lens L, which was roughly ground in the previous step 12, onto the beveling grindstone 13 as shown in FIG. 7(A). Detects whether it comes into contact with the object.

At this time, the contact point S of the lens L with the beveling grindstone 13 corresponds to the processing stored at address a of the second memory 112 in correspondence with the template radius pa, as schematically shown in FIG. 7 CB). Machining angle of radius vector length data (La, θa) 08 Direction of die plate radius R (now, this radius vector pa is on the X axis), that is, X
It is located at the machining line K rotated by oa from the axis.

A predetermined number of pulses corresponding to a predetermined reference height χD is supplied from the pulse generator 103 to the motor 200 via the driver circuit 300 under the control of the control circuit 108, and the mold is moved up to the reference height χD. Lower the pedestal 38. At this time, the number of pulses supplied to the motor 200 is counted by a counter 301. The grindstone 13 has two stages V as shown in Fig. 7(C).
In the case of the shaped grindstone 13', a so-called "medium V grindstone", χD is determined on the gently inclined surfaces 13b' and 13c'. If there is no contact at this time, the determination circuit 302 determines that the pulse generator 10
Even if a predetermined number of pulses from 3 are supplied, the detector 204 is
Since no N signal is generated, it is determined that there is no contact, and this fact is output to the control circuit 108.

The control circuit 108 reverses the motor 200 and returns the lens shafts 22a, 22b to their initial heights. Then, the control circuit 108 operates the motor 32 to move the carriage 20 to the left in FIG. 7 by a small distance in the Y-axis direction (the axial direction of the lens axis), and then re-executes the above operation. ,
The front edge of the lens is the front grindstone surface 1 of the bevel grindstone 13.
3b at the reference height χD. When the reference height χD is reached, the detector 204 outputs an ON signal to the determination circuit 302 and also outputs a stop signal S to the counter 301. From pulse generator 103 to motor 32
The number of pulses supplied to the motor 200 and the motor 32 are counted by a counter 301, and the counter 301 receives a signal from a 0 judgment circuit 302, which has a double structure and can independently count the number of pulses supplied to the motor 200 and the motor 32. The control circuit 10g that has received the count value of the counter 301 is sent to the arithmetic circuit 106, and is temporarily stored in an internal memory (not shown) in the arithmetic circuit 106.

At the point of contact at the reference height xD, this is stored as the lens movement amount Y7L in the third memory 113 in correspondence with the template vector radius a L (in the case of this embodiment, it corresponds to the template vector radius a L). , so it is stored as Y, a). Counter 301 has now been reset. While lowering the mold pedestal 38 for the first time, if the front edge of the roughly ground lens L comes into contact with it while descending to the reference height xD, in order to lower the mold pedestal 38, Pulse generator 103
The number of pulses supplied to the motor 200 from the detector 204 is counted by the counter 301, and the control circuit 108 receives a signal from the 0 judgment circuit 302, which stops counting at the time of contact with the stop signal from the detector 204. , at that point, the count value of the counter 301 is sent to the arithmetic circuit 106, and the reference height x
D and the difference ΔχD determines the inclination angle ε of the V-shaped grindstone.
The Y movement amount ΔY that can be stopped based on 1 is sent to the control circuit 108, and after the lens is moved to the same right in the axial direction by the Y movement amount ΔY, the same operation is repeated again.

Next, until the rear edge Lb of the lens L reaches the reference height xD (this reference height xD is the front edge, there is no problem even if it is different from when measuring). 13 while detecting whether it comes into contact with the front grinding wheel surface 13c.
Lower the 8. Needless to say, the carriage is moved rightward in advance to a position where the edge end does not come into contact with the front grindstone surface 13b of the grindstone 13.

The subsequent operation is the same as when measuring the edge of the lens, but only the movement in the Y direction is in the opposite direction.

The Y-direction movement value when the reference height xD is reached is set as YbL and stored in the third memory 113 in correspondence with the template vector radius p (in this embodiment, since it corresponds to the template vector radius p, Yba ).

Thereafter, the above operation is similarly performed for the template radius vector ab+Pet ad, and the corresponding Y movement amount Yjb*YI is obtained. *Y/d and YbbtYbcpYbd are determined and stored in the third memory 113.

The position of the contact point on the front side of the edge with respect to the Y direction position of the grinding line 13a of the bevel grinding wheel 13 at the reference height xD is χD/lan
ε1, and the position of the contact point on the rear side of the edge is χD/lanε2.

The Y coordinate memory value Y when measuring the front contact point is χD/l
When moved by anξ, the front contact point becomes the bevel grinding wheel 13.
It comes on the grinding line 13a. The edge thickness V at this time is.

Wt=[(ZD/1ans 1)+(zD/lang
z)]-]lY, t-Ybtl-■.

This edge thickness 11L is the rotation angle θ of the lens shafts 22a and 22b.
L and its radius vector A are stored in the fifth memory in correspondence with L. At this time, the rate of change ΔWL of the edge thickness with respect to the change in the radius vector is stored in the fifth memory from each machining radius P and the edge thickness V.

Then, the lens shafts 22a, 22b and the lens L to be processed are lowered by xD in FIGS.
'tt Edge thickness VL between both side corners a and b of the bevel part, / is the grinding wheel surface 13b, 1 of the bevel grinding wheel 13.
It can be determined based on the rate of change ΔVL and the rate of change Δv in the width of the V-groove between 3c. Then, this edge thickness %l, / is stored in the sixth memory together with the rotation angle OL, radius vector, and Pt of the lens shafts 22a and 22b.

Here, the chamfering device main body 40 is connected to the main body 1 as shown in FIG. 8(C).
0, the stopper 45a of the swing arm 44 is brought into contact with the arm stopper receiver 56, and the shaft portion 56a of this arm stopper receiver 56 is brought into contact with the stopper screw 57. K the horizontal imaginary line
Then, a distance Lx is set between this imaginary line and the center of rotation θe of the bevel grindstone 13. Also, when the mold holder 38 is raised by eHL and the upper part of the lens L to be processed is brought into contact with the chamfered slopes 52a and 52b' of the V groove of the chamfering grindstone 52, the lens axes 22a and 22b and the imaginary line The distance to K is LHL (□8
, ), furthermore, the radius of the single-chamfer grindstone 52 is rot, the radius to the bottom of the V groove of the chamfer grindstone 52 is r1, and the radius of the chamfer grindstone 52 is r1,
22b is the rotation angle θL, the radius vector from the contact part of the lens L to the mold holder 38 is PLtm), and this radius vector is L
The height of the bevel on (Ill) is Δht, the edge thickness of the corners a and b on both sides of this bevel is 'L(1), and the radius vector advanced by π from L(etl) , the radius vector including the contact part of the lens L to be processed with the chamfering grindstone 52 is calculated using Lucks.
41. The radius vector up to this contact part is PL (ycee++
, the height of the bevel portion D' on this radius vector L (□8,) is Δ
h (7111), a, b between both side corners of this bevel portion D'
The edge thickness of `` is ``L ( Let the depth of the groove be R, and the maximum width of this V groove be Ijx.

Using the signs of such conditions, from the edge thickness vL2 rotation angle θt, radius vector A, etc. stored in the sixth memory, L)It(
x+et+=71(goat)+r,,-ΔhL(v
c++u) IIL(**et+(a) Also, hLlc*s+1 in formula (a) is ht(+
ciI, l+=ho(llt tx*11.+v
X)/vX-・-・””-・-'-(b).

From these formulas (a) and (b), LHL (goat3 is.

LHL(gas,)2 A [(πth g,)+r6 −
Δ h Llylla+1h o('L tx*e+
)-rix)/Wx=----(/N).

Moreover, Lx is Lx =fl Fa+atts+++e)ItrIl+
3+LHt(**et+-(d) Therefore, the vertical movement control amount eHLc63 of the mold holder at this position is (a) to (d)
, the arithmetic circuit 106 calculates at(1(=,)=Lx
(QFo+, /'t+e+>+eHtte+)+
It can be obtained as LHtt**e, ))(e).

Therefore, the control information necessary for the chamfering process obtained in this way, that is, eHtta+1, is stored in the seventh memory in correspondence with the radius vector /'L(.1) corresponding to each rotation angle θ of the lens axis. It is used during the chamfering process described later.

When chamfering is performed, control is performed to raise the height by an amount equal to aHL(etl plus the chamfer height hw).

On the other hand, if the bevel position of the solid line is placed at the edge thickness position S based on the edge thickness wL mentioned above, the amount of movement in the Y direction at that time is tangi) + (zD/langs) lY,L
−Yl, tl)−■.

If the optical axis of the lens to be processed is eccentrically attached to the lens axis of the carriage, the center of the bevel spherical surface including this processing point pt will not be located at the rotation axis of the lens axis. .

If the amount of deviation of the bevel spherical surface from the center of the own vehicle in the three-dimensional coordinate axes (X, Y, Z) direction corresponding to
t-A)"(yt-B)'÷(Z 1-C)" =
Re2χL = L LCOIIθt
−・= (7) ZL: L L sin θ( becomes.

Therefore, the deviation amounts A, B, C and the radius of curvature Re can be calculated using the machining angle θL and the machining radius vector length LL for at least four template radius vectors A,
, pb, a. , processing point PayPbyPC corresponding to ad
+Pd Y direction movement amount ya, yb, yc, yd (6)
Find it using the formula.

It is determined by substituting the obtained ya*Vb*yCtyd and solving the above equation (7). Machining radius vector length data (LLtθL
), the movement amount y[ can be obtained from equation (7) after A, B, C, and Re are determined. Further, in the embodiment shown in FIG.
In addition, when the user inputs the bevel curve value Ce using this input device 121, the calculation device 106 calculates Ra from (n is the refractive index of the lens, usually n=1.525 is used), and calculates the value of Re. is substituted into the above equation (7) to obtain the lens Y-axis direction movement amount y based on an arbitrary bevel curve value Ce.
It is possible to find L.

The determined Y-axis direction movement amount yL during bevel processing of the lens
111 of the fourth memory 114 in correspondence with the template radius vector L.
The Y-axis direction movement amount data (attyt) (
t=LLLL...N).

Step 15 During beveling grindstone processing, the control circuit 108 uses the fourth memory 114
The motor 21 and the motor 32 are controlled using the Y-axis direction movement amount data (A*tyt) from , so that when the template radius vector A L is located on the X-axis, the carriage 20 is at the position yL. do. As a result, the bevel apex can be formed at the position of the specified ratio tooth:S over the entire circumference of the edge of the lens.

Further, when a bevel curve value Ce is given, processing is performed so that the bevel apex of the entire circumference is located on the bevel curved surface having that curve.

In addition, in step 14, assuming that the lens L is eccentrically attached to the lens axis of the carriage, the four template radius vectors ad, a5. a. , lens descent amount χDa based on ad
+χDb+χDCtχDd is calculated, and from this, the (6)
The amount of movement y in the Y@ direction is calculated using the equation (7).

However, if it is guaranteed that the lens L is attached to the lens axis without being decentered at all, then the (7th
) In the formula, the deviation amounts A, B, and C are all zero, so only the movement amount ya obtained from the lens descent amount χDa based on one template radius vector ad, the machining radius t, a, and the machining angle θd. The radius of curvature Re of the bevel spherical surface can be determined, and after determining the radius of curvature Re, the Y-axis direction movement amount y based on an arbitrary template radius vector L is determined by the radius vector in the second memory 112. It can be obtained using the machining radius vector length data (τ, 1T) for L.

2 Kodo 2 When the above-mentioned lens shape grinding process is completed.

The operation of the beading machine, that is, the lens grinding device is stopped. In this state, the chamfering device main body 40 is shown in FIG. 8(C).

When it is attached to the main body 10 as shown in (D) and the chamfering switch MS is turned on, the control circuit 108 operates according to the sequence program in the sequence program memory 120. As a result, the control circuit 108 raises the mounting portion 54 to a predetermined height, that is, the position shown in FIG.
The mold holder 38 is controlled to move up and down in accordance with L(s+1) based on L(ll+3), and both corners of the bevel portion of the lens L to be processed are chamfered.

During this chamfering, the mold holder 38 raises the chamfering grindstone 52 by hw from the height position Lx via the lens L to be processed, slightly raises the swinging arm 44 upward, and moves the stopper 45a to the arm. It is moved up and away from the stopper receiver 56 by ■v. In this state, the chamfering grindstone 52 is pressed against both corner portions a and b of the bevel portion of the lens L to be processed by its own weight on the swing arm 44 side. Note that, before the lens L to be processed comes into contact with the chamfering whetstone 52, the chamfering whetstone 52 is rotationally driven by the motor 51.

As the corners a and b are chamfered by this rotation and pressure contact, the swinging arm 44 is gradually displaced downward, and the stopper 45a comes into contact with the arm stopper receiver 56. After this contact, a part of the weight of the swinging arm 44 side is received by the elastic force of the elastic member 59, so the pressure force of the chamfering grindstone 52 being pressed against the lens L to be processed due to the weight of the swinging arm 44 side. becomes gradually smaller as the swing arm 44 is displaced downward. Then, the shaft portion 56 of the arm stopper receiver 56
When a comes into contact with the upper end of the stopper screw 57, the downward displacement of the swing arm 44 is stopped, and the pressing force of the chamfering grindstone 52 against the lens L to be processed becomes zero, and the radius vector is adjusted. 06,
) will be completed. Therefore, by performing such a chamfering operation slightly for each radius vector, a chamfer with a depth of approximately - is made on both sides of the bevel portion of the lens L to be processed.

(Effects of the Invention) As described above, according to the present invention, a carriage is mounted on a main body so as to be movable up and down and movable laterally; a pair of lens shafts are mounted on the carriage in a lateral direction;
edge thickness measuring means for measuring the edge thickness of the peripheral edge of the lens to be processed, which is held between the pair of lens axes, in correspondence with each radius vector; A memory that stores the edge thickness of the lens corresponding to each radius, and a memory that is arranged above the lens axis so as to be rotatable about an axis parallel to the lens axis, and that moves up and down with respect to the lens to be processed. a chamfering grindstone that is movably attached to the main body; a stopper that regulates the descending height of the chamfering grindstone with respect to the main body; Since the structure includes a control circuit that controls the depth of chamfering, even non-experts can easily chamfer both sides of the lens to be processed, and furthermore, the chamfering work can be shortened. . Further, the chamfer depths of both corners of the lens to be processed can be made substantially constant.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example in which the chamfering device according to the present invention is applied to a lens grinding device, and FIG. 2 is a flowchart explaining its operation. FIG. 3 is a schematic diagram showing a method for determining the distance between the axes. Figures 4 and 5 are schematic diagrams showing the method of obtaining machining motion length data, Figure 6 is a schematic diagram showing the relationship between lens rotation angle, machining radius vector length, and machining angle; Figure 7 (A); (B) and (C) are schematic diagrams showing a method of measuring the amount of lens descent. 8(A) and 8(B) are schematic diagrams showing a method for determining the amount of movement in the Y-axis direction, FIG. 8(C) is an explanatory diagram of the main part of the present invention, and FIG. C) is a plan view, FIG. 8(E) is a cross-sectional view taken along line E-E in FIG. 8(D), and FIG. 8(F) is a cross-sectional view taken along line F-F in FIG. 8(C). An explanatory diagram of the operation. Figure 8 (G) is a partial explanatory diagram of Figure 8 (F), Figures 9 and 10 are schematic diagrams showing the relationship between lens diameter and lateral movement, and Figure 11 is equipped with a conventional chamfering device. A perspective view of the lens processing machine. FIG. 12 is an explanatory diagram showing the relationship between the chamfering grindstone of FIG. 11 and the lens to be processed. 10...Main body 12...Rough whetstone 13...Bevel grindstone 22a, 22b...Lens shaft 25.32.37...Motor 38...Mold pedestal 40...Chamfering device main body 44... ... Swinging arm 45a ... Stopper 51 ... Motor 52 ... Chamfering grindstone 56 ... Stopper receiver 56a ... Shaft portion 57 ... Stopper screw (fixed stopper) 301 ...
Counter 302... Control circuit 106... Arithmetic circuit 108... Control circuit 110... Memory L... Lens to be processed. Figure 8 CF) Rough Figure Figure

Claims (1)

[Claims] A carriage mounted on the main body so as to be movable up and down and movable laterally, a pair of lens shafts mounted on the carriage in a horizontal direction, and a peripheral edge of the lens to be processed held between the pair of lens shafts. an edge thickness measuring means for measuring the thickness in correspondence with each radius vector; a memory storing the edge thickness of the lens to be processed in correspondence with each radius vector based on an output signal from the edge thickness measuring means; a chamfering whetstone disposed above the lens axis so as to be rotatably driven around an axis parallel to the lens axis, and attached to the main body so as to be movable up and down with respect to the lens to be processed; and the chamfering whetstone The vehicle is characterized by comprising a stopper that regulates the height of descent of the carriage relative to the main body, and a control circuit that controls the raising and lowering of the carriage based on information in the memory to control the chamfer depth of the both corner portions. A device for chamfering both corners of eyeglass lenses.