JPH07100291B2 - Jade machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball slicing machine for grinding a spectacle lens so as to match the shape of a spectacle frame.

[0002]

2. Description of the Related Art A conventional ball-slicing machine is generally of a copying type and has a lens rotation shaft that holds a lens to be processed and rotates at a low speed. The lens rotation shaft is supported on the base by a carriage so that the distance between the rotation shaft of the lens and the grinding wheel can be changed. A template that is formed by copying from the lens frame of the spectacle frame is coaxially attached to the lens rotation axis of this carriage, and the lens to be processed chucked on the lens rotation axis is ground at a low speed while being grinded with a grindstone. When the circumference comes into contact with the abutting stop member located substantially on the same surface as the grinding surface of the grindstone, the lens to be processed is considered to have been processed into the same shape as the template, and the grinding operation is completed. By the way, in the conventional ball slicing machine, when the lens to be processed is ground into the shape of the lens frame of the spectacle frame, the lens to be processed is brought into pressure contact with the grindstone, so that the lens rotation axis is rotated and the grinding radius is successively increased. As it changes to, there is a lot of grinding allowance, that is, in the grinding radius of the cutting with a large amount of cutting, extra pressure is applied to the lens to be processed, the processed lens attached for processing, i.e., the chucked lens is misaligned, In particular, in the case of a lens having a thin peripheral portion, the lens may be chipped and it may not be ground into the same shape as the template.

[0003]

An object of the present invention is to pay attention to the above-mentioned problems of the conventional ball-sliding machine, to measure the shape of the lens frame of the spectacle frame directly or through the template, and to set the maximum value of the measured values as a boundary. It is an object of the present invention to provide a ball slicing machine that can control grinding processing.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention
Is a lens frame of a spectacle frame or is molded following the lens frame.
Radius information of the template (ρ_n, Θ_n), (N = 1, 2, 3
Frame shape measuring means for digitally measuring N ..., and a predetermined position
Grinding wheel for lens grinding that is rotated at high speed with the frame shape measurement
Radial information (ρ_n, Θ_n), (N =
The lens to be processed is processed based on 1, 2, 3 ... N).
Radial reference value calculating means for calculating a radial reference value r'for
The maximum value r of the grinding diameter is calculated from the radial reference value calculating means. _max
To determine the maximum machining radius value and the maximum machining radius value
Maximum value r obtained by the value selection means_maxIs equal to
Up to the radial information (ρ_n, Θ_n), (N = 1, 2, 3, ...
N) without using the lens grinding wheel
Let it continue, maximum value r_maxWhen it becomes equal to
Report (ρ_n, Θ_n), (N = 1, 2, 3, ... N) before
Control means for controlling the grinding process by the grindstone for lens grinding
It is characterized in that it has.

[0005]

Since the present invention has the above-mentioned structure, the grinding allowance of the lens to be machined is reduced, and the pressing time of the grindstone is reduced to the same portion of the lens to be machined, especially to the portion having a large depth of cut, and It is possible to prevent axial deviation of the processed lens.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Outline of Apparatus FIG. 1 is a perspective view showing a grinding processing section of a grinding apparatus, that is, a ball-sliding machine according to the present invention. Rough grindstone 3 in grindstone chamber 2 of case 1
A circular grindstone 3 including a, a bevel grindstone 3b, and a flat precision machining grindstone 3c is collected, and the grindstone 3 is attached to a rotary shaft 5 having a pulley 4. The pulley 4 is connected to the rotary shaft of the grindstone motor 6 via a belt 7, and the grindstone 3 is rotated by the rotation of the grindstone motor 6. A carriage shaft 12 is rotatably supported on the bearings 10 and 11 formed in the housing 1 so as to be slidable in the axial direction, and one end of the bearing 21a is formed on a feed table 20 described later. It is rotatably fitted in. Arms 14 and 15 of a carriage 13 are fixed to the carriage shaft. Further, the carriage 13 has arms 16 and 17, and these arms 16 and 17
A pair of coaxial lens rotation shafts 18 and 18a for holding and rotating the lens LE to be processed are attached to the lens.
A chucking handle 19 is attached to one of the lens rotation shafts 18a, and by rotating the chucking handle 19, the shaft 18a can be slid in the axial direction to sandwich the lens to be processed.

Wheels 22 are attached to a base plate 21 of the feed table 20, and the wheels 22 are rotatably mounted on rails 23 attached to the housing 1, whereby the feed table is set on the rails 23. Therefore, it is held so that it can be moved. Sending stand 2
The female screw portion 24 of 0 meshes with the feed screw 41 connected to the rotating shaft of the motor 40, and the feed table 20 is moved left and right as shown by an arrow 25 by the rotation of the motor 40. The bearing 21a is formed on the feed base 20 as described above, and the carriage shaft 12 is attached to the bearing 21a. Therefore, the carriage 1 is moved by the lateral movement of the feed base 20.
3 will also move left and right. Further, the substrate 2 of the feed table 20
Two parallel shafts 26, 26 'are planted in the shaft 1, and a carriage elevating member 27 is attached to the shafts so as to be vertically movable. A female screw portion 28 is formed on the carriage raising / lowering member 27, and a feed screw 43 fixed coaxially with the rotation shaft of the raising / lowering member feed motor 42 meshes with the female screw portion 28. The elevating member 27 is vertically moved by the movement. On the upper surface of the lifting member 27, the arm 16a protruding from the carriage 13
A rotary wheel 16b attached to the tip of the carriage 13 abuts on the carriage 13 so that the carriage 13 is swung by the vertical movement of the carriage lifting member 27. Lens Frame Measuring Means FIG. 2 is a perspective view showing an example of a measuring means for digitally measuring the shape of a lens frame of spectacles or a target lens shape preliminarily modeled in accordance with the lens frame. The protruding shaft 18b of the lens rotation shaft 18 protruding outside the arm 16 of the carriage 13 is fitted into a bearing 50 formed on the carriage 13. One long side frame 52 of a detection arm 51 formed of a rectangular rod-shaped frame is attached to the end portion 18c of the shaft 18b in a direction orthogonal to the rotation axis of the shaft 18b. A detector 54 is slidably attached to the other long-side frame 53, and the detector 54 is constantly pressed toward the frame end side by a spring 59 inserted in the frame 53.
Pulleys 57 and 58 are rotatably attached to the short side frames 55 and 56 of the detection arm 51.

On the other hand, a pulley 60 is rotatably inserted on the shaft 18b, and a code plate 62 of an encoder 61 is fixedly mounted coaxially on the pulley 60. The encoder detection head 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 the pulley 6 is connected via the pulley 57.
After winding 0, the other end is fixed to the side surface of the pulley 60. Further, one end of the second wire 81 is fixed to the detector 54, and the second wire 81 is wound around the pulley 60 via the pulley 58 in the opposite direction to the first wire, and the other end is fixed to the side surface of the pulley 60. Thus, 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. 5, the detector 54 has a sliding seat 541 slidably fitted in the frame 53, and is rotatable about the shaft O ₁ with respect to the sliding seat 541, and the shaft O ₁ And a detection feeler portion 542 mounted slidably in the axial direction. The feeler portion 542 is a rotary slide shaft 54 mounted on the slide seat 541 so as to be rotatable and axially slidable.
3, the shaft 543 is provided with a template detection contact 544 having a semicircular cross section by notch molding.

A substantially U-shaped arm member 545 is attached to the rotary sliding shaft 543, and a lens frame detecting contact wheel 546 is rotatably attached to an end of the arm member 545. Contact surface 544a of contactor 544 and contact wheel 5
The contact peripheral surfaces 546a of 46 are both arranged on the axis O ₁ . In the vicinity of the other end of the rotary sliding shaft 543, a pin 547 is fixed in a penetrating manner in parallel with the contact surface 544a. The pin is attached to a locking member 548 attached to the long side frame 52 when the detector is in the initial position. The side surfaces are abutted. In the carriage 13, a lens shaft rotating motor 70 and a sprocket axle 71 having sprocket wheels 72 and 73 rotated by the rotation of the motor 70 provided at both ends are incorporated. Further, sprocket wheels 74 and 75 are provided on the lens rotation shafts 18 and 18a, respectively, and a chain 76 is wound around the sprocket wheels 72 and 74, and a chain 77 is wound around the sprocket wheels 73 and 75, respectively. It is configured to transmit rotation as rotation of the lens rotation axis. On the other hand, a pedestal 91 of the spectacle frame holding means 90 is provided in the scouring machine housing 1, and the pedestal 91 is in a relationship parallel to the longitudinal direction of the arm 16 when the carriage 13 is located at the initial fixed position. It is located in. On this pedestal 91, the arm 1 of the carriage 13 is attached.
Two rails 92 and 93 are attached in parallel with the longitudinal direction of 6, and eyeglass frame holder supporting members 94 and 95 are slidably arranged on the rails 92 and 93. Support member 94
And 95 are constantly pulled by springs 96 toward each other. A feed screw 97a provided on the rotation shaft of the motor 97 is meshed with the foot portion 95a of the support member 95. The upper portions of the arms 94b and 95b of the support members 94 and 95 are the eyeglass frame holder 1
It has clamping tools 94c and 95c for clamping 00.

As shown in FIG. 3, the eyeglass frame holder 100 includes a base plate 101 having a circular opening 102 in the center,
The base plate 101 includes eyeglass frame holding arms 103 and 104 slidably attached to each other so as to face each other, and an equalizer 105 for pressing the eyeglass frame from above. The lens frame 201 to be measured holds the spectacle frame 200 on the circular opening 102 so that the holding arms 103, 104 can be positioned.
The upper and lower rims of the lens frame are sandwiched by and the lens frame is pressed and fixed by the equalizer 105. At this time, the edge 105a at the front end of the equalizer 105 and the edge 105b at the rear end of the equalizer 105 are formed in the cutouts 1 of the holding arms 103 and 104, respectively.
03a and 104a, 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 clamps 94c and 95c are the holder 10 that holds the spectacle frame 200.
Make 0 pinch. Here, the rear end 105b of the equalizer 105 and the rear edge 101b of the base plate have the same distance d with respect to the bevel groove center 201b of the lower rim of the lens frame.
Base plate 101 and equalizer 1 so that they are separated only
05, the notch 103a, 104a is comprised. On the other hand, since the clamps 94c and 95c are formed with the sloped grooves 94d and 95d, as shown in FIG.
When the holder 100 is clamped by c and 95c, the edge 105b of the rear end of the equalizer 105 and the rear edge 101b of the base plate are in contact with the slope, and the center of the contact distance between them coincides with the groove center of the slope groove. Will be automatically pinched. As a result, the bevel groove center 201b of the lower rim of the lens frame coincides with the slope groove center of the clamps 94c, 95c.

When the template is supported by the eyeglass frame holder supporting members 94 and 95, a template holder 110 is used as shown in FIG. The template holder 110 is the support frame 1
11 and cylindrical members 112, 11 attached to both ends thereof
3, the template mounting column 114 that is planted in the center of the support frame 111, and the pin 1 that is planted on the end face of the column.
It is composed of 14, 115 and 116. Template 21
0 is the pin 11 due to the hole previously formed in it
It is mounted on the mounting column by fitting it to the mounting members 4, 115 and 116, and is supported by sandwiching this template holder between the supporting members 94 and 95. Operation of Measuring Unit Next, the measurement of the spectacle lens frame by the measuring unit having the above configuration will be described below. After holding the spectacle frame holder 100 between the support members 94 and 95 and moving the carriage 13 by a predetermined amount in the direction of arrow A (see FIG. 1) by the motor 40, the lower groove 201 of the lens frame 200 at the initial setting position is moved. The motor 97 is rotated so that the contact wheel 546 and the contact wheel 546 come into contact with each other on the same plane.
2, 93 are moved by a predetermined fixed amount so that the rotation center O ₂ of the detection arm 51 is located within the lens frame. At this time, the lower groove 201 of the lens frame 200 hooks the contact wheel 546, and at the same time, the pin 547 is released from the locking member 548 so that the rotary sliding shaft 543 can be freely rotated. The movement amount of the detector 54 on the frame 53 is converted into the rotation amount of the encoder by the wires 80 and 81.

Now, as shown in FIG. 2, the carriage 13 and
And the detection arm 51 in the initial fixed position as shown in FIG.
As the detector 54 does not contact the eyeglass frame, the spring 59
Axis O when emitted and in initial position₁Set the origin 0 on the line
Therefore, the rotation center O of the detection arm 51 from this origin 0₂Until
The distance is 1, and the above-mentioned fixed amount of movement and detection of the spectacle frame is performed.
Encoder that moves the detector as the arm rotates
The count value of C_nAnd the encoder resolution is eo / pu
lse, the resolution due to the movement amount of the detector at this time is d
(Mm) / pulse, and the detection arm 51 at the initial position described above.
So that it is parallel to the arm 16 of the carriage 13,
If this is taken as the reference angle 0 °, the rotation angle θ of the detection arm 51_n
Radius ρ of the lens frame at_nIs, in this embodiment,
Encoder for the amount of movement of the detector 54 on the detection arm 51
A shape that also includes the rotation amount of the detection arm when detecting with 61.
Is detected by ρ_n= L- (C_n−θ_n/ E) d ・ ・ ・ ・ ・ ・ ・ ・ ・ (1) is given. From equation (1), θ_n= 0
Radial ρ at the reference position ₀Is ρ_o= L-C_od ・ ・ ・ ・ ・ ・ ・ Given as (2).

In this way, the detection arm 51 is attached to the lens.
If you rotate the entire circumference of the frame, the center of rotation O₂In
Shape information of lens frame 200 (ρ_n, Θ_n) (Where n =
0, 1, 2, 3, ... N) are obtained as digital values.
This (ρ_n, Θ_n) Indicates that the center of rotation of the detection arm 51 is
Position of the frame O₂Is the data when located in
When the center of rotation is located at the geometric center of the lens frame 200
Not data. A method for correcting this is shown in FIGS. 8 and 9.
A description will be given based on the schematic diagram. Carriage 13 is in the initial position
Center of rotation O of the detection arm when it is placed₂And carriage
The straight line connecting the swing center O of the
The XY Cartesian coordinate system with the X axis as the
Measurement data (ρ_n, Θ_n) X_n= Ρ_n× cos θ_n y_n= Ρ_n× sin θ_n ・ ・ ・ ・ ・ ・ ・ ・ The coordinates are converted based on the polar coordinate-orthogonal coordinate exchange formula in (3).
Use coordinate values. Lens frame data in Cartesian coordinates
(X_n, Y_n), The minimum value in the direction parallel to the X-axis direction
Coordinate point A (x_a, Y_a) And the maximum value coordinate point C (x_c，
y_c), And the minimum coordinate point D in the direction parallel to the Y-axis direction
(X_d, Y_d), The maximum coordinate point B (x_b, Y_b)
Remoto, from this O₃(x₃, Y₃) = ((X_c-X_a) / 2, (y_c-Y_a) / 2) ... Geometric center O of the lens frame given as (4)₃Ask for.
Center of rotation O during initial measurement ₂(x₀, Y₀ ) And (4)
The center O₃(x₃, Y₃) Difference x₀-X₃= Δ_x,
y₀-Y₃= Δ_yThe glasses by the rotation of the motor 97
Frame holding means 90_yJust move. Also, Δ_xIs
It is given by the amount of swing of the carriage 13. This swing is
It is given by the vertical movement amount h of the ridge lifting member 27. Book
In the embodiment, the swing radius of the rotation center of the detection arm is
M, the swing radius m to the contact point of the rotating wheel 16b is M = 2
Since there is a relationship of m, Δ_x≈ M tan β h ≈ m tan β Therefore Δ_x≒ 2h ······················· (5)
The center of rotation of the output arm is the geometric center of the lens frame O₃Matches
Let Next, rotate the detection arm 51 by the angle β
to correct. In this way, the detection arm 51 is connected to the geometrical shape of the lens frame.
The detection arm was re-circulated all around while being positioned in the center.
The lens frame shape information (ρ_n, Θ
_n) Is obtained as a digital value and then stored.Template measuring means FIG. 10 shows a template when a template is used instead of the lens frame.
FIG. 6 is a schematic diagram showing a method of measuring the shape of FIG. Same as Figure 7 above
The same reference numerals are given to one component and the following description is omitted.
To do. In the case of template measurement, the template detection contactor 544 is used as the template.
The detection arm 51 is rotated by abutting on the peripheral surface portion 211 of 210.
The shape is measured by rolling. Detected in template
Center of rotation O of arm 51₂Raw material to put in
Move from point 0 a predetermined distance. In addition, the detection arm
Angular position θ_nRadius ρ when located at_nIs tρ_n= (C_n−θ_n/ E) d-1 ································· (6) and the radius of movement tρ0 at the reference angle θ0
Is tρ₀= Cod-l ... (7)

The template shape information (tρ thus obtained)_n,
θ_n) (N = 0,1,2,3 ... N)
Find the center of science and move the center of rotation of the detection arm to that position.
Moving, re-measuring, and storing the data are as described above.
This is the same as the case of measuring the lens frame. In this example,
In this case, as shown in FIG. 5, it is inscribed in the groove of the lens frame.
Contact point 546a of contact ring 546 and contact 544 for target lens
Contact surfaces 544a of both are the rotation axis of the rotary sliding shaft 543.
O₁The contact wheel 54 is configured to be located above
6 or contact 544 receives contact pressure and arm member 545
So that it is located in the direction normal to the contact surface at the contact point.
Accurate measurement is always possible by rotating the dynamic sliding shaft. Grinding control mechanism and its action Next, the measured value of the lens frame or template obtained in this way is
Based on the structure and operation of grinding unshaped lenses
Description will be made with reference to FIGS. 11 to 15. Lens rotation axis
18, 18a (see FIG. 1)
The grinding wheel rotating motor 6 is driven to rotate the grinding wheel 3
The unshaped lens is pressed against the grindstone 3 by the weight of the carriage.
To process.

In the present invention, the unshaped lens LE is a shape measurement value (ρ _n , θ _n ) of the above-mentioned lens frame or template (n = 0,
It is processed according to the numerical data given by 1, 2, 3 ... N). In this embodiment, the linear encoder 610 is used to check the carriage swing amount l _n . This encoder has a scale 611, one end of which is attached to the side surface of the support member 30 so as to be rotatable around a fulcrum P.
The detection head 612 is also rotatably attached to the side surface of the carriage 13. The rotation angle γ of the carriage given by the swing amount l _n of the carriage is also the same angle as the rotation angle γ of the detection head 612. The movement of the detection head due to the rotation of the carriage is detected as a read value of the scale. Here, in the present embodiment, the scale 611 is rotatable around the fulcrum P, so the reading e of the detection head e
The distance between _{1 and} e ₂ actually gives the distance C between e ₁ ′ and e ₂ . On the other hand, the distance R between the rotary shaft 12 of the carriage and the fulcrum P
_Since the length P of the chord stretched by the carriage rotation angle γ of the circular arc 613 with _S as the radius is designed to be the same as the above-mentioned distance C, the reading amount of the encoder 610 is directly the rotation angle amount γ of the carriage. The length is the length of the chord, and twice the length is the swing amount l _n . In this way, the encoder 610 is configured to check the progress of processing moment by moment.

FIG. 12 is a block diagram showing a grinding control circuit. The lens frame shape measurement information (ρ _n , θ _n ) from the encoder 61 of the lens frame measuring means is stored in the memory-1001.
Memorized in. A selection circuit 1004 is connected to the memory 1001, and this selection circuit uses the lens frame shape measurement information (ρ _n , θ _n ) in the memory 1001 as r _max selection circuit 1.
This is a gate circuit for controlling which of 006 or the radial reference value calculation circuit 1005 is used for transfer. The r _max selection circuit uses frame shape measurement information (ρ _n , θ _n ) in the memory 1001.
It is a circuit that selects the maximum radius ρ _max of the dynamic radius ρ _n among them and obtains the radius radius value r _max of the grinding diameter of the lens to be processed having the same size. The output from the r _max selection circuit is input to the elevator movement amount calculation circuit 1010, where the movement amount d _max of the elevating member 27 is d _max = m (L−r _max ) / M ... (8) where M is the swing radius of the carriage, m is the swing radius up to the contact point Q ₁ of the rotating wheel 16b, and L is the rotation center of the lens rotation axis and the expected grinding point Q of the lens.
_It is calculated as the distance to ₂ (see Fig. 11).

The amount of movement obtained by the arithmetic circuit 1010 is input to the elevator motor controller 1011 which drives the motor 42 to move the elevator member 27 up and down. On the other hand, the radial reference value calculation circuit 1005 uses the lens frame shape information (ρ _n ,
The value of θ _n ) for each radial line is read, and the radial value difference between rough grinding and final bevel grinding is calculated from the radial value r _i after processing of the lens to be machined, which is equal to this radial vector ρ _i , This is an arithmetic circuit for obtaining a radial reference value r _i ′ that allows for a cutting adjustment amount α (hereinafter referred to as an adjustment amount) that can be set to an arbitrary amount in advance according to the grinding ability. The output of the arithmetic circuit 1005 is input to the elevator movement amount arithmetic circuit 1010, the lens rotation motor controller 1013, and the comparator 1009 described above. The lens rotation axis motor controller 1013 determines the motor 70 based on the radial line information θ _i from the arithmetic circuit 1005.
To rotate the lens rotation axis to set the processing meridian of the lens to be processed to this θ _i . Further, the sensor 612 of the encoder 610 measures the carriage lowering amount l _i every moment, and the measured data is counted by the counter 1007 and input to the machining radius calculation circuit 1008.
Here, the machining radius r _i ″ of the lens to be inspected is calculated every moment.

The relationship between the carriage descent amount l _ni (see FIG. 11) and the lens working radius r _i ″ is given as L−l _ni = r _i ″ (9). Machining radius r from arithmetic circuit 1008
_i ″ is compared with the radial reference value r _i ′ from the arithmetic circuit 1005 by the comparator 1009 and when r _i ′ = r _i ″, a command is issued to the elevator motor controller 1011 to raise the carriage 13 by the motor 42. Simultaneously, the coincidence signal from the comparator 1009 is
Is also entered. The comparator 1012 receives a timing signal from the timing circuit 1014 which is started in response to the start signal ST of the carriage descending operation of the motor controller 1011. By inputting the coincidence signal from the comparator 1009, the timing signal from the timing circuit is input. It is configured to stop the input of the timing signal. All of the above circuits are under the control of the processing control circuit 1002, and are controlled by the instructions of the program stored in the program memory. Figure 13
It is a flow chart which shows the sequence of the above-mentioned processing control circuit. FIG. 14 is a diagram showing the change of the machining radius r ″ with the progress of the grinding process of the lens along with the time change. 15 is a schematic view showing a grinding processing state of the lens to be processed.

The grinding step will be described below. Step 1 ... In response to a command from the processing control circuit 1002, the motor 6 is driven to rotate the grinding wheel 3 at high speed. Step 2 lens Wakudo diameter information memory 1001 ...... selection circuit 1004 (ρ _n, θ _n) was transferred to r _max selection circuit, the radius vector information (ρ _n, θ _n) from ρ _max r _{ma x} Selection A circuit is selected, and the same machining radius reference value r _max as ρ _max is input to the elevator movement amount calculation circuit 1010. Step 3 ... The arithmetic circuit 1010 calculates d _max from r _max from the r _max selection circuit based on the equation (8), and d
_{The max} value is input to the elevator motor controller 1011. Step 4 ... The processing control circuit 1002 issues a command to the lens rotation axis motor controller, which continuously rotates the lens rotation axis motor 70 to rotate the lens to be processed having a radius r sandwiched by the lens rotation axis at a low speed. Let Step 5: Based on the input from the elevator movement amount calculation circuit 1010, the elevator motor controller 1011 rotates the motor 42 by a predetermined amount to move the elevator member 27 to d _max.
Lower to position. By the lowering of the elevating member, the carriage 13 also swings downward by its own weight, and the lens to be processed comes into contact with the grindstone 3 while rotating at a low speed, and grinding is started.

Step 6 ... The encoder 610 measures the descending amount of the carriage moment by moment and counts it by a counter-1007.
To count. Step 7 ... The count value from the counter 1007 is sequentially
This is input to the machining radius calculation circuit 1008, and this calculation circuit 1
The machining radius is calculated according to the formula (9) by 008. Step 8 ... The comparator 1009 is the machining radius calculation circuit 10
The machining radius values r ″ and r that are input momentarily from 08
The r _max values from the _max selection circuit 1006 are compared and r ″ = r
Continue grinding until it reaches _max . And r ″ = r
When it reaches _max , that is, when the lens to be processed is ground into a circular lens whose radius is the maximum radius r _max obtained from the lens frame information, the wheels 16b of the carriage 13 come into contact with the elevating member 27, and further, At the same time when the lens LE is not ground, the elevator motor controller 1
When the coincidence signal from the comparator 1009 is input to 011 the motor 42 is rotated to temporarily raise the carriage by a small amount to separate the lens to be processed from the grindstone, and at the same time, the processing control circuit 1002 switches the selection circuit 1004. Step 9 ... The selection circuit 1004 inputs the information (ρ ₀ , θ ₀ ) of the lens frame radius vector information (ρ _n , θ _n ) in the memory 1001 to the radius vector reference value calculation circuit 1005.

Step 10 ... Radial reference value calculation circuit 10
Reference numeral 05 denotes a machining radius reference value r ₀ ′ obtained by adding an adjustment amount α to ρ _{0 based} on the inputted (ρ ₀ , θ ₀ ) information, and from this r ₀ ′, the lowering position d ₀ of the elevating member 27 is determined by ( Elevator movement amount calculation circuit 1010 is used for calculation based on equation (8). Step 11 ... From the (ρ ₀ , θ ₀ ) information, the lens rotation shaft motor 70 is rotated through the lens rotation motor controller 1013 to set the radial line of the lens to be processed at the position of θ ₀ . Step 12 ... The motor 42 is rotated via the elevator motor controller based on the value d ₀ from the elevator movement amount calculation circuit 1010 to lower the elevator member 27 to the position d ₀ , whereby the carriage 13 is moved by its own weight. The lens LE descends and comes into contact with the grindstone 3 again at the position of the radius vector θ ₀ , and the processing along this meridian is started. At the same time, the timing circuit 1014 starts timing. Steps 13 and 14 ... Steps 6 and 7 described above
With the same action as above, the progress of lens grinding is measured moment by moment.
As the grinding process of the lens LE progresses, as shown in FIG. 15, the number of grinding portions CA between the lens LE and the lens LE increases. When the lens LE to be processed is a plastic lens having a large refractive index, the cutting ability of the grindstone may reach its limit and the lens may not be cut. The following steps are performed to prevent the problem.

Step 15: Lens is detected by the comparator 1009.
Machining radius r ″ and radius reference value r₀Compare if ′ matches
However, when they do not match, the comparator 1012 determines that they are the same.
When the timing information t from the timing circuit 1014 is predetermined
Constant processing time t₀Compared with t>t₀, Ie Figure 1
4, a predetermined time t₀Lens even after
The machining radius r of is the radius reference value r₀If it does not reach ′,
The motor 42 via the elevator motor controller 1011
Rotate to disengage the lens from the grindstone. Next Step 1
Move to 7 with incomplete processing. Normal time t
₀Within the lens processing radius r "and radius reference value r₀'Matches
If so, the process proceeds to step 17. Step 16 ... Lens frame radius information of memory 1001
(Ρ_n, Θ_n) From ρ ₀+ 1 = ρ₂, Θ₀+ 1 = θ₂
Input the radius vector information of the above into the radius vector reference value calculation circuit 1005,
The radial information (ρ₂, Θ₂) Based on the above
Step 10 to Step 15 are executed and the radial line θ₂In
Perform processing. Step 18 ... The following lens frame radius information (ρ_n, Θ_n)
(N = 1, 2 ... n) Step 10 based on all information
Or Step 15 is executed. Step 19 ... Lens frame radius information (ρ_n, Θ_n)Also
When the processing along the whole line of Dozuki is completed, the elevator motor
The motor 42 is rotated through the controller 1011 to move up and down.
The member 27 is raised to the reference position d, which causes the carriage
Move J 13 back into place.

Then, if necessary, the process proceeds to the next beveling. Incidentally, as shown in FIG. 14, the change rate due to machining progress of lens processing radius vector r _n "in the dynamic diameter line theta _n decreases as close mutual agreement with the target machining moving radius value r _n '. So this Based on the rate of change of the machining radius (the differential coefficient of the graph in FIG. 14), when the rate of change becomes smaller than the predetermined rate, the process moves to the machining of the radius line of the next machining radius line θ _n +1. May be.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a ball slide machine according to the present invention.

FIG. 2 is an exploded perspective view showing a lens frame measuring device.

FIG. 3 is a perspective view of a lens frame positioning device.

FIG. 4 is a front view of a lens frame positioning device.

FIG. 5 is a side view showing a partial cross-section of the structure of a detector for measuring a lens frame.

FIG. 6 is a perspective view of a template measuring device.

FIG. 7 is a schematic diagram showing a lens frame measuring operation.

FIG. 8 is a schematic diagram showing a lens frame measuring operation.

FIG. 9 is a schematic diagram showing a lens frame measuring operation.

FIG. 10 is a schematic diagram showing a template measuring operation.

FIG. 11 is a schematic view showing a lens grinding step.

FIG. 12 is a block diagram showing a processing control circuit.

FIG. 13 is a flowchart of processing control.

FIG. 14 is a chart showing the progress of lens processing.

FIG. 15 is a schematic view showing the progress of lens processing. DESCRIPTION OF SYMBOLS 3 Whetstone LE Lens to be processed 13 Carriage 27 Lifting member 42 Motor 51 Lens frame type measuring device 610 Encoder 13, 27, 42 Lens releasing means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiyuki Hatano 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Topcon Co., Ltd. (72) Inventor Hiroaki Ogushi 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Topcon Co., Ltd. Within

Claims (1)

[Claims] 1. Radial information (ρ _n , θ _n ) of a lens frame of a spectacle frame or a template molded in accordance with the lens frame, (n =
Frame shape measuring means for digitally measuring 1, 2, 3 ... N), a lens grinding wheel rotated at a predetermined position at high speed, and radius vector information (ρ _n ,
θ _n ), (n = 1, 2, 3, ... N), and a radial reference value calculating means for calculating a radial reference value r ′ for processing the lens to be processed; To maximum grinding diameter r _max
And a maximum value r obtained by the maximum processing radius value selecting means.
_The radial information (ρ _n , θ _n ) until it becomes equal to _max ,
Grinding with the grindstone for lens grinding is continued regardless of (n = 1, 2, 3, ... N), and when it becomes equal to the maximum value r _max , the radius vector information (ρ _n , θ _n ), (n = 1, 2,
3 ... N), and a control means for controlling the grinding process by the grinding wheel for lens grinding.