JPH07100289B2 - Lens processing availability determination device for ball mill - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a grinding machine for grinding a processed lens for putting a lens in a lens frame of a spectacle frame, and more specifically to the lens. The present invention relates to a processing feasibility determination device.

(Prior Art) For the ball-slicing machine, Japanese Patent Application No. 60-115079 filed previously by the applicant
There is something like that disclosed in the issue. This ball shaving machine has a frame shape measuring means for measuring the shape of the lens frame of the spectacle frame for inserting the lens, and considers the amount of eccentricity between the optical center of the lens and the geometric center of the lens frame. It has a calculation means for obtaining the machining radius (ρ _i ′, θ _i ′) after the processing. In addition, this grinding machine compares the radius vector length ρ _i ′ of the processed radius vector information with the radius R of the unprocessed lens, and ρ _i ′ ≧
If there is a radius vector of R, a lens having a desired lens frame shape cannot be obtained even if an unprocessed lens is processed. Therefore, a lens processing availability determination means is provided to warn the operator.

(Problems to be Solved by the Invention) There is eyeglasses in which a vertical width of a lens frame of eyeglasses is extremely narrow, which is referred to as so-called Kanye lenses in near-purpose eyeglasses. When grinding such glasses with a grinding machine, the diameter of the holding member is too large than the short diameter of the lens frame when using a normal holding member for holding the lens on the lens rotation axis of the grinding machine. If the eccentricity cannot be ground correctly, or if the eccentricity is zero, the machining locus of the lens may fall within the holding range if the eccentricity is slightly decentered. In such a case, when the lens is ground with a grindstone, the grindstone grinds the holding member,
There is a possibility that the device itself may be damaged.

Further, such a defect can occur not only in the case of the above-described Kanime lens but also in general glasses when the amount of eccentricity increases.

As in the above-mentioned conventional ball slicing machine, the shape of the lens frame is stored and held by an electric signal called radius vector information, and in the case of processing based on it, the positional relationship between the lens and the radius vector is physically visible. Since it is impossible to confirm, it is even more difficult to judge whether or not the lens can be processed before the processing work. And, it is not possible to check in advance whether or not such lens processing is possible with the conventional ball-slicing machine.

Therefore, an object of the present invention is to eliminate the above-mentioned conventional drawbacks, and to provide a lens processing feasibility determining device for a ball-slicing machine that determines whether or not the above-described lens machining failure may occur before lens processing. To provide.

(Means for Solving the Problem) For this purpose, the ball-sliding machine of the present invention is a measuring means for measuring the shape of a lens frame of an eyeglass frame, and a workpiece corresponding to the measured lens frame shape. The means for determining the processing locus of the lens, the judgment means for judging whether or not the processing locus is included in the nipping range of the lens to be processed by the lens nipping member, and the judgment means are “included”.
And a warning means for issuing a warning when the determination is made.

Further, another ball milling machine sandwiches the lens to be processed with a measuring unit that measures the shape of the lens frame of the eyeglass frame, a unit that obtains a processing locus of the lens to be processed corresponding to the measured lens frame shape. A holding member for holding, and a filler that is moved toward the holding member in correspondence with the processing locus, and whether or not the filler comes into contact with the holding member before the filler moves on the processing locus. It has detection means for detecting and warning means for issuing a warning based on the detection by the detection means.

Moreover, the filler also serves as the filler for measuring the lens thickness.

Further, another ball squeezing machine sandwiches the lens to be processed with a measuring unit that measures the shape of the lens frame of the spectacle frame, a unit that obtains a processing locus of the lens to be processed corresponding to the measured lens frame shape. A sandwiching member for, and a filler that is moved toward the sandwiching member corresponding to the processing trajectory,
A determination unit that determines whether or not there is a difference between the movement position of the filler in the initial radius of the machining locus and the movement position in the initial radius after one round of the machining locus, and the determination unit determines that there is a difference. And a warning means for issuing a warning. Moreover, the filler also serves as a filler for measuring the lens thickness. Further, the filler is moved by a moving means having a pulse motor, the number of pulses required to move the filler in the initial radius, and the pulse required to move the filler in the initial radius after one round of the machining trajectory. The determination means determines whether or not the numbers match.

(Examples) Examples of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 is a block diagram showing a configuration of a first embodiment of a lens processing feasibility determination device for a ball slide machine according to the present invention.

In FIG. 1, reference numeral 1 is a frame shape measuring device. This frame shape measuring device 1 uses the radial shape information (ρ _i , θ) as the shape of the lens frame of the spectacle frame, for example, the shape indicated by LF in FIG.
_i ) is measured as numerical information (electrical signal) and stored in the memory 2. The structure and operation of the frame shape measuring apparatus 1 are described in Japanese Patent Application No. 60-115079 and Japanese Patent Application No. 60-2874.
Reference numeral 3 is the same as that described in detail in No. 91, and 3 is a measuring device for measuring the thickness of the lens L. The measuring device 3 includes a pulse motor 36 and the pulse motor 36.
It has a movable stage 31 that can be moved toward and away from the lens L in conjunction with. For example, a protruding pin 31a is provided on the side surface of the movable stage 31, and when the movable stage 31 returns to the initial position, the micro switch 38 is pressed and turned on. On this movable stage 31, the lens L
Of the fillers 32 and 34 that come into contact with the front and rear refracting surfaces, springs 38 and 38 that urge the fillers 32 and 34 to always approach each other, and the movement amounts a _i and b _{i of the} fillers 32 and 34. Encoders 33 and 35 for detecting are installed. The movement amounts a _i and b _i of the fillers 32 and 34 detected by the encoders 33 and 35 are input to the microprocessor 5.

As shown in FIG. 2A, the fillers 32, 34 have rotating discs 32a, 34a having a radius r, and filler shafts 32b, 34b supporting the rotating discs 32a, 34a at their tips. The fillers 32 and 34 can hold the lens L by the action of the springs 38 and 38. The filler shaft 32b, the distance between the axes of 34b and Di, Di-2r = Δ _i is the thickness of the lens. The lens L is sandwiched by the sandwiching members 4a, 4a of the lens rotation shafts 4, 4 of the carriage (not shown), and the lens rotation shafts 4, 4 are rotationally driven by the pulse motor 37. Therefore, the lens L is rotationally driven integrally with the lens rotation shafts 4, 4 by the pulse motor 37. Moreover, the pulse motors 36 and 37 are the memory 2
It is connected to the.

The microprocessor 5 includes a memory 2, an input device 6, and
It is connected to the warning display device 7. This input device 6 is
This is for inputting the eccentricity amount represented by the upper shift amount U and the inner shift amount I shown in FIG. The warning display device 7 is composed of, for example, a liquid crystal display or a lamp.

Next, the operation of this embodiment will be described with reference to the flowchart of FIG.

Step 10 The shape of the lens frame LF of the spectacle frame is obtained by the frame shape measuring device 1 as the radial information (ρ _i , θ _i ) [i = 1,2,3, ... N] and stored in the memory 2. .

Step 11 Perform this step as needed. That is, the fourth
As shown in the figure, it is executed only when decentering between the optical center OL of the lens and the geometric center O _G of the lens frame LF is required. The eccentricity amounts U and I are input to the microprocessor 5 by the input device 6. This microprocessor 5 is a processing locus EL after eccentricity.
And the radial information (ρ _i ′, θ _i ′) is stored in the memory 2. The method for obtaining the processing locus EL is the same as that described in detail in Japanese Patent Application No. 60-115079.

Machining radius (ρ _i ′, θ _i ′) stored in the memory 2
Data of the initial radius vector (ρ ₀ ′, θ ₀ ′) where i = 0 is input to the pulse motors 36 and 37. As a result, the pulse motor 37 rotates the lens rotation shafts 4, 4 and the filler 3
The moving direction Y of 2, 34 is made to coincide with the initial radial angle θ ₀ ′ of the lens. In FIG. 4 below, the lens L is not rotated but the moving direction Y of the fillers 32 and 34 is illustrated for convenience, and the moving direction Y is changed to i [] in correspondence with the rotation angle θ _i ′. i = 1,2,3, ... N].

For the pulse motor 36, as shown in FIG.
The rotating disk 32 at the tip of the filler 32, 34 corresponding to _i ′
lens rotation axis 4, a so that a, 34a is located at a position ρ _i ′ from the axis of lens rotation axis 4, 4 (coincident with the optical center of lens L).
4 and the stage 31 at the initial position O _m with a known distance Q
_The number of pulses S _i required to advance the moving distance l _i having the relationship of _i = Q−ρ _i ′ is supplied.

That is, when the radial information (ρ ₀ ′, θ ₀ ′) of i = 0 is read from the memory 2, the rotary disc 32 at the tip of the filler 32, 34 is read.
As shown in FIG. 4, a and 34a are positioned at the radial length ρ ₀ ′, and the pulse amount supplied to the pulse motor 36 at that time is S ₀ .

Steps 13 to 15 In this step, i = 1 is added. That is, 0 + 1 =
1, the next radius vector (ρ ₁ ′, θ ₁ ′) is read from the memory 2 and ρ ₁ ′ −ρ ₀ ′ = S ₁ −S ₀ = ΔS ₁ minute pulse motor
Supplying pulses to 36, rotating disk 3 at the tip of filler 32,34
2a and 34a are moved to the position of the radial length ρ ₁ ′. The pulse motor 37 is supplied with pulses corresponding to θ ₁ ′ −θ ₀ ′ = Δθ (unit rotation angle). Thereafter, similarly, the radial information is sequentially read from the memory 2, and the pulse of the difference from the previous radial is output to the motor.
The pulse motor 37 is supplied with a pulse corresponding to a unit rotation angle, and the pulse motor 37 is supplied with a pulse corresponding to a unit rotation angle.

FIG. 4 illustrates a state in which the filler moving direction Y is rotated for convenience, instead of rotating the lens.

Now, the moving amount of the filler from the radial ρ ′ _m-1 to ρ ′ _m is Δρ _m
Then, the number of pulses changed to that is ΔS _m . However, the amount of movement of the fillers 32, 34 from the radial ρ ′ _m to ρ ′ _{m + 1} is Δρ
_{m + 1} and the number of pulses required for it is ΔS _{m + 1} , but the second B
As shown in the figure, since the fillers 32 and 34 contact the side surfaces of the lens holding members 4a and 4a and are prevented from advancing, the supplied pulse number ΔS _{m + 1} is discarded due to the step-out phenomenon of the motor. I will end up.

Hereinafter, this phenomenon until [rho _'n is repeated. That is, the number of pulses supplied for moving the filler to the radial vectors ρ ′ _{m + 1 to} ρ ′ _n (perspective portion A) is all discarded because the movement of the fillers 32 and 34 is blocked by the lens holding members 4a and 4a. To be

However, in the movement from the radial ρ ′ _n to the radial ρ ′ _{n + 1} ,
Since ρ ′ _n <ρ ′ _{n + 1} , the movement is in the direction of retreating from the lens L, and the number of supply pulses ΔS _n ′ for the movement amount Δρ _n is negative, that is, a pulse for inverting the pulse motor 36. Become. Therefore, the fillers 32 and 34 are supplied with the pulse number ΔS without being blocked by the lens holding members 4a and 4a.
Move by Δρ _n using _n pulses. However, in the previous radius vector ρ ′ _n , the fillers 32 and 34 were not located at the regular Pn position but were located at Pn ′ due to the blocking of the lens holding members 4a and 4a. Therefore, radial ρ ′
position after the filler movement in _{n + 1} are moved to P 'n _{+ 1} instead of P _{n + 1} of the normal.

Similarly, i is successively increased until N + 1 = 0, that is, until the initial radius is reached. Then, the rotating discs 32a, 34a at the tip of the filler after one round of the machining locus EL are not at the regular position P ₀ but at P ₀ ′.
Is located in.

Steps 16 and 17 The microprocessor 5 causes the pulse motor to 36 | S ₀ ′ | = S
Supplying an inverted pulse number S ₀ with the relationship ₀ ', Stage 3
Return 1 to the initial position Q. However, the fillers 32,34
Since it is at the position P ₀ ′, the projecting pin 31 a of the stage 31 turns on the micro switch 38 before all the pulse number S ₀ ′ is supplied to the pulse motor 36. The number of pulses supplied to the pulse motor 36 when the And S ₀ ′ are compared.

Step 18 In this comparison If not, a warning is issued to the operator on the warning display device 7,
Notify that the lens L cannot be ground so that it has the processing locus EL.

As described above, in this embodiment, the positions of the initial radius vector (ρ ₀ ′, θ ₀ ′) of the fillers 32 and 34 and the radius vector after one round of the machining locus (ρ ′ _{N + 1} , θ ′ _{N + 1} ) = If there is a difference between the filler position of (ρ ₀ ′, θ ₀ ′), it is determined that a part of the processing locus has entered the lens holding range, and a warning is issued that lens processing is impossible.

This lens processing non-judgment device is disclosed in Japanese Patent Application No. 60-11.
As described in detail in No. 5079, it also serves as a lens thickness measuring means used for automatically determining the bevel position for beveling the lens L.

Second Embodiment In this embodiment, as shown in FIG. 2B, for example, a contact detection sensor 40 such as a capacitance type sensor or a pressure sensitive element is attached to the front surface of the rotating disk 34a of the filler 34, When it is detected that the rotating disc 34a comes into contact with the side surface of the lens holding member 4a,
The warning display device 7 is operated by the actuator 41.

[Third Embodiment] As shown in the block diagram of FIG. 5, this embodiment has a frame shape measuring device 1, a memory 2, a microprocessor 5, and a warning display device 7 similar to those of the first embodiment. Moreover, the microprocessor 5 is connected to the memory 50 that stores the value of the radius r of the lens holding member 4a in advance.

Then, as shown in the flowchart in FIG. 6, the frame shape measuring device 1 measures the radius vector information (ρ _i , θ _i ) of the lens frame, and the microprocessor 5 determines the machining locus including the eccentricity as necessary. After obtaining the radius vector information (ρ _i ′, θ _i ′), the processing radius vector length ρ _i ′ and the radius r of the lens holding member 4a from the memory 50 are compared by the microprocessor 5,
If ρ _i ′ ≦ r, as shown in FIG. 7, there is a part of the locus outside the lens processable range (hatched portion B), that is, within the lens sandwiching range, and it is determined that lens processing is not possible, and the warning device 7 Drive to generate a warning.

If necessary, the input device 51 is connected to the microprocessor 5 as disclosed in Japanese Patent Application No. 60-115079 so that the radius R of the lens L can be input. Then, as shown as step 40 in the flowchart of FIG.
_{When i} is larger than the radius R, it is determined that the radius vector ρ _i extends out of the lens, and a warning that lens processing is impossible is issued.

(Effects of the Invention) As described above, according to the present invention, it is possible to know whether or not a processing locus intrudes into the lens holding range, and if it does, a lens that can warn the operator that lens processing is impossible. A processing availability determination device can be provided.

This makes it possible to prevent processing errors and damage to the ball slide machine.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment of the present invention. FIG. 2A is an explanatory diagram showing the relationship between the configuration of the tip portion of the filler and the lens. FIG. 2B is an explanatory view showing a state in which the filler is prevented from advancing by the lens holding member, and also for explaining the second embodiment of the present invention. FIG. 3 is a flow chart for explaining the operation of the first embodiment. FIG. 4 is a schematic diagram for explaining the operation principle of the first embodiment. FIG. 5 is a block diagram showing the configuration of the third embodiment of the present invention. FIG. 6 is a flow chart showing the operation of the third embodiment. FIG. 7 is a schematic diagram showing the operating principle of the third embodiment. 1 …… Frame shape measuring device 3 …… Lens thickness measuring device 5 …… Microprocessor 7 …… Warning display device 32,34 …… Filler 40 …… Contact detection means 41 …… Actuator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Shigeki Kuwano 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Tokyo Optical Machinery Co., Ltd. (72) Shinji Uno 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Tokyo Optics Machine Co., Ltd. (72) Inventor Takahiro Watanabe 75-1 Hasunumacho, Itabashi-ku, Tokyo Tokyo Optical Machine Co., Ltd.

Claims (6)

[Claims] 1. A measuring means for measuring a shape of a lens frame of a spectacle frame, a means for obtaining a processing locus of a lens to be processed corresponding to the measured shape of the lens frame, and a lens clamping member for clamping the lens to be processed. A scouring machine comprising: a determination unit that determines whether or not the processing locus is included in a range, and a warning unit that issues a warning when the determination unit determines that the processing locus is included. Lens processing availability determination device. 2. A measuring means for measuring a shape of a lens frame of an eyeglass frame, a means for obtaining a processing locus of a lens to be processed corresponding to the measured shape of the lens frame, and a holding member for holding the lens to be processed. And a detection unit that has a filler that is moved toward the holding member in correspondence with the processing locus, and that detects whether or not the filler is in contact with the holding member before the filler moves on the processing locus. And a lens processing feasibility determining device for a ball-slicing machine, comprising: a warning unit that issues a warning based on the detection of the detection unit. 3. The lens machining feasibility determination device for a ball slicing machine according to claim 2, wherein the filler also serves as a filler for measuring a lens thickness. 4. A measuring means for measuring the shape of a lens frame of an eyeglass frame, a means for obtaining a processing locus of a lens to be processed corresponding to the measured shape of the lens frame, and a holding member for holding the lens to be processed. A filler that is moved toward the sandwiching member in correspondence with the processing locus, a moving position of the filler at an initial radius of the processing locus, and a moving position at an initial radius of one round of the processing locus. A lens processing feasibility determining device for a ball-slicing machine, comprising: a determining unit that determines whether there is a difference and a warning unit that issues a warning when the determining unit determines that there is a difference. 5. The lens machining feasibility determination device for a ball slicing machine according to claim 4, wherein the filler also serves as a filler for measuring a lens thickness. 6. The filler is moved by a moving means having a pulse motor, and the number of pulses required to move the filler in the initial radius and the movement of the filler in the initial radius after one round of the machining locus are moved. The lens processing feasibility determining device for a ball shaving machine according to claim 4 or 5, wherein the determining means determines whether or not the required number of pulses matches.