JPH11156685A - Spectacle lens grinding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently machine even many lenses with restraining a size error. SOLUTION: A glass roughly grinding wheel 30 and an intermediate finishing grinding wheel 31 having four V-grooves are coaxially mounted to a rotational shaft of a lens grinding part 300L, and the glass roughly grinding wheel 30 and a precisely finishing grinding wheel 34 having four V-grooves are coaxially mounted to a rotational shaft of a lens grinding part 300R. During machining, movements of the lens grinding parts 300L, R are controlled so as to sequentially change V-grooves of each used finishing grinding wheel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyeglass lens grinding apparatus for grinding a lens to be processed so as to fit an eyeglass frame.

[0002]

2. Description of the Related Art As a device of this kind, a rough grinding wheel corresponding to the material of a lens to be processed having a grain size of about 100 to 120 and a finishing grindstone having a bevel groove having a grain size of about 400 are coaxially mounted on a grinding wheel rotating shaft. There is known an apparatus provided with a lens to be processed, which is held on a lens rotating shaft, is pressed against each grindstone so as to form a bevel on the peripheral edge of the lens to be processed. The apparatus processes the roughly processed lens to a final shape that fits the spectacle frame with one bevel groove of the finishing whetstone.

[0003]

By the way, as the number of processed lenses increases, the grindstone wears in proportion to the number of processed lenses.
In particular, when the finishing grindstone used for the final finishing process has a large amount of wear, it tends to lead to an error in the finished size. In addition, the wear of the grinding stone causes a reduction in processing accuracy due to a reduction in the processing performance of the grinding stone.

In order to suppress the size error and the decrease in the processing accuracy, it is necessary to periodically check the finished size and adjust the size. However, when processing a large amount by a manufacturer such as a sunglass lens, Doing this frequently is inefficient.

In view of the above problems, it is an object of the present invention to provide an apparatus capable of efficiently processing a large number of lenses while suppressing a size error.

[0006]

Means for Solving the Problems In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) In a spectacle lens grinding apparatus for grinding a lens to be processed so as to fit with an eyeglass frame, a finishing whetstone having a plurality of bevel grooves for forming a bevel on a peripheral edge of the roughly processed lens is provided. Control means for processing so as to sequentially change the bevel groove of the finishing whetstone to be used,
It is characterized by having.

(2) In the eyeglass lens grinding apparatus of (1), the finishing whetstone is provided with a plurality of bevel grooves on one finishing whetstone.

(3) In the eyeglass lens grinding apparatus of (1), the finishing whetstone has a plurality of finishing whetstones of a medium finishing whetstone and a precision finishing whetstone, and each has a plurality of bevel grooves.

(4) In the eyeglass lens grinding apparatus of (3), further, a grinding wheel rotating shaft provided on each of the semi-finishing wheel and the precision finishing wheel, and a movement for moving each grinding wheel rotating shaft with respect to the lens to be processed. Means are provided.

(5) The eyeglass lens grinding apparatus of (4)
Further, it is characterized in that it has a control means for controlling the moving means so as to perform the precision finishing by the precision finishing whetstone on the part where the intermediate finishing is completed during the processing by the intermediate finishing whetstone.

(6) The eyeglass lens grinding apparatus of (1)
Further, the invention is characterized in that a size adjusting means for adjusting the finished size of the lens to be processed is provided for each of a plurality of bevel grooves of the finishing whetstone.

[0013]

An embodiment of the present invention will be described with reference to the drawings.

[Entire Structure of Apparatus] In FIG. 1, reference numeral 1 denotes a main base, and 2 denotes a sub base fixed to the main base 1.
Is. Reference numeral 100 denotes an upper portion of the lens chuck, and 150 denotes a lower portion of the lens chuck. During processing, each of the chuck shafts holds the lens to be processed. Further, a lens shape measuring section 400 is housed in the back side of the sub-base 2 below the lens chuck upper portion 100.

Reference numerals 300R and 300L denote lens grinding units each having a grinding wheel for lens grinding on each rotating shaft.
Each of the lens grinding units 300R and 300L is held movably in the vertical and horizontal directions with respect to the sub-base 2 by a moving mechanism described later. Lens grinding unit 300
As shown in FIG. 2, a rough grinding stone 30 for glass and a medium finishing grinding stone 31 having a bevel groove are coaxially attached to the L rotary shaft. The medium finishing whetstone 31 is made of a metal bond whetstone having a grain size of 400, and four V-shaped bevel grooves 31a to 31d of the same shape are provided on the whetstone surface. On the rotating shaft of the lens grinding unit 300R, the same rough grinding wheel 30 for glass as that on the lens grinding unit 300L side,
A precision finishing whetstone 34 having a bevel groove is mounted coaxially. The precision finishing grindstone 34 is made of a metal bond grindstone having a grain size of # 600, and its grindstone surface is provided with four bevel grooves 34a to 34d having the same shape as the bevel groove of the medium finishing grindstone 31. These grindstones have a relatively small diameter of about 60 mm to improve machining accuracy and ensure durability of the grindstones. With such a grindstone configuration, the apparatus of the embodiment is configured to be suitable for processing a large amount of beveling of a non-standard sunglass lens made of glass.

A display unit 10 for displaying processing information and the like and an input unit 11 for inputting data and instructing the apparatus are provided on the front surface of the housing of the apparatus. Reference numeral 12 denotes an openable and closable door.

[Configuration of Main Parts] <Lens Chuck Part> FIG.
FIG. 4 is a diagram for explaining a lens chuck lower part 150; A DC motor 103 is mounted on a fixed block 101 fixed to the sub-base 2 by a mounting plate 102. The rotation of the DC motor 103
04, a timing belt 108, and a guide rail which is transmitted to the feed screw 105 via the pulley 107 and is fixed to the fixed block 101 by the rotation of the feed screw 105.
The chuck shaft holder 120 is moved up and down by being guided by the chuck 109. A pulse motor is provided above the chuck shaft holder 120.
The rotation is transmitted to the gear 131, the relay gear 132, and the gear 133, and the chuck shaft 1 is fixed.
21 rotates. Reference numeral 124 denotes a lens press attached to the chuck shaft 121. 135 is a photo sensor, 136 is a light shielding plate attached to the chuck shaft 121, and the photo sensor 135 is a chuck shaft 12
One rotation reference position is detected.

The lower chuck shaft 152 is a main base 1
The rotation of the pulse motor 156 is transmitted and rotated by a holder 151 fixed to the holder 151. 159
Is a cup receiver attached to the chuck shaft 152, which receives the fixed cup fixed to the lens to be processed and holds the lens to be processed. Reference numeral 157 denotes a photosensor, and 158 denotes a light shielding plate attached to the gear 155. The photosensor 157 detects a rotation reference position of the lower chuck shaft 151.

With the lens chuck having such a structure, the lens to be processed mounted on the chuck shaft 152 is chucked by the downward movement of the chuck shaft 121.
The chuck pressure at this time is controlled so that the load current of the DC motor 103 is monitored by a control unit 600 described later and becomes appropriate.

<Moving Mechanism of Lens Grinding Unit> FIG. 4 is a view for explaining the moving mechanism of the lens grinding unit 300R. 201
Is a vertical slide base 201, which can slide up and down along two guide rails 202 fixed to the front surface of the sub-base 2. A U-shaped screw holder 203 is fixed to the side surface of the subbase 2, and a pulse motor 204R is fixed to the upper end of the screw holder 203. A ball screw 2 is provided on the rotation axis of the pulse motor 204R.
When the ball screw 205 rotates, the vertical slide base 201 fixed to the nut block 206 is guided by the guide rail 202 to move up and down. Subbase 2 and vertical slide base
A spring 207 is stretched between itself and the base 201, and the spring 207 urges the vertical slide base 201 upward,
The downward load of the vertical slide base 201 is canceled to facilitate vertical movement. Reference numeral 216R denotes a photo sensor, and 217 denotes a light shielding plate fixed to the nut block 215. The photo sensor 216R detects the position of the light shielding plate 215 and determines a reference position for the vertical movement of the left and right slide base 210.

Reference numeral 210 denotes a left and right slide base to which the lens grinding unit 300R is fixed.
It is slidable left and right along two guide rails 211 to which one is fixed. A U-shaped screw holder 212 is fixed to the lower end of the vertical slide base 201, and a pulse motor 214R is mounted on the side of the screw holder 212.
Is fixed, and a ball screw 213 is coupled to the rotation shaft. A nut block 215 is screwed into the ball screw 213.
As shown in FIG. 5, is connected to a protruding portion 210a extending from the lower portion of the left and right slide base 210 by a spring 220. (The mechanism shown in FIG. 5 is stored behind the nut block 215 in FIG. ing). Spring 22
Numeral 0 urges the left and right slide base 210 toward the lens chuck. When the ball screw 213 is rotated by the rotation of the pulse motor 214R and the nut block 215 moves to the left in FIG. 5, the left and right slide base 210 pulled by the spring 220 also moves to the left. If a grinding pressure greater than the urging force of the spring 220 is applied during processing of the lens to be processed, the left and right slide bases 210 do not move even if the nut block 215 moves to the left, and the grinding pressure on the lens to be processed is adjusted. Is done. When the nut block 215 moves to the right in the drawing, the protrusion 210a is pushed by the nut block 215, and the left and right slide base 210 also moves to the right.
A photo sensor 221R is attached to the protrusion 210a, and the photo sensor 221R is
By detecting the light-shielding plate 222 fixed to 5, the processing end is detected.

The photosensor 216R fixed to the screw holder 212 detects the light-shielding plate 217 fixed to the nut block 215, and
The reference position of the left-right movement of 10 is determined.

The moving mechanism of the lens grinding unit 300L is symmetrical to the moving mechanism of the lens grinding unit 300R, and a description thereof will be omitted.

<Lens Grinding Unit> FIG.
It is a side sectional view showing the composition of 0R. Left and right slide base
A shaft support base 301 is fixed to the shaft 210, and a housing for rotatably holding a vertically extending rotating shaft 304 having a group of grindstones such as the coarse grindstones 30 attached to a lower portion is provided at a front portion of the shaft support base 301. 305 is fixed.
A servo motor 310R is fixed to an upper portion of the shaft support base 301 via a mounting plate 311.
The rotation of the heater 310R is controlled by the pulley 312, the belt 313, the pulley.
The grindstones are transmitted to the rotating shaft 304 via the rim 306 to rotate.

The configuration of the lens grinding unit 300L is the same as that of the lens grinding unit 300R in the left-right direction, and therefore the description thereof is omitted.

<Lens Shape Measuring Unit> FIG. 7 is a schematic side view showing the structure of the lens shape measuring unit 400. The lens measuring unit 401 is suspended and held by a rail 403 attached to the lower surface of the fixed base 402 via a moving block 404 so as to be slidable back and forth. A motor 405 for moving back and forth is fixed on the fixed base 402, and the rotation of the motor 405 is controlled by the pulley 406 and the belt 4.
07, and transmitted to the feed screw 409 via the pulley 408. A female screw that is screwed with the feed screw 409 is formed inside the moving block 404, and is guided by the rail 403 by the rotation of the feed screw 409 to move back and forth.

Below the moving block 404, a lens measuring unit 401 having the following configuration is mounted. A guide shaft 412, a rear support 413, and a middle support 414 are fixed between the upper plate 410 and the lower plate 411. A bearing 415 that slides up and down is inserted into the guide shaft 412, and a measurement arm 417 having a probe 416 in contact with the lens surface to be processed is fixed to the bearing 415.
The measurement arm 417 is urged upward by a spring 418. Behind the measuring arm 417, the mounting block 42
The rack 419 is fixed via the first and third racks 3. Middle strut 41
A potentiometer 420 is fixed to 4, and a pinion 421 screwed to a rack 419 is attached to a rotation axis of the potentiometer 420. The potentiometer 420 detects the amount of movement of the measurement arm that moves up and down. Reference numeral 422 denotes a spring for canceling a downward load of the measuring arm, and one end of the spring is fixed to the mounting block 423.
A feed screw 430 is provided between the upper plate 410 and the lower plate 411.
Are rotatably held. Feed screw 430 is lower plate 4
The pulley 43 is driven by a motor 431 attached to the pulley 43.
2. Rotate via belt 433 and pulley 434. 4
Reference numeral 35 denotes a moving block having a female screw screwing with the feed screw 430, and the guide shaft 41 is rotated by rotation of the feed screw 430.
2 to slide up and down. When the moving block moves downward, the lower surface on the guide shaft 412 side contacts the bearing 415, and pushes down the measuring arm 417. The initial position, which is the lowest point of the measurement arm 417, is the sensor 436 and the light shielding plate 4 fixed to the mounting block 423.
37.

The lens shape measuring section 400 having such a configuration
Is measured as follows. First, the motor 405 is driven based on the frame shape data of the spectacle frame to move the lens measurement unit 401 to the measurement position. Next, when the motor 431 is rotated forward by a predetermined pulse and the feed screw 430 is rotated, the moving block 435 moves upward. Along with this, the measuring arm 417 is also pulled upward by the spring 418 and moves upward, so that the tracing stylus 416 comes into contact with the front surface of the lens to be processed. The moving block 435 moves to a sufficient escape position. The lens to be processed is rotated once while the tracing stylus 416 is in contact with the front surface of the lens, and the lens measurement unit 401 is moved back and forth based on the frame shape data. At this time, the amount of movement of the tracing stylus 416 in the lens chuck axis direction is detected by the potentiometer 420, and the shape of the lens to be processed can be obtained.

In the lens measurement in the apparatus of the embodiment, the shape of the front surface of the lens is measured twice according to different measurement trajectories based on the spectacle frame data. With these two measurements, the inclination of the front surface of the lens at the edge position is obtained for each meridian, and this is used for calculating bevel data (described later). Note that Japanese Patent Application Laid-Open
As in the case of No. -20603 and others, the bevel data may be calculated by measuring the front surface and the rear surface of the lens, or dedicated measuring elements may be provided for the front surface and the rear surface of the lens. In the case of a sunglass lens having a spherical surface, if there is one point of data (for example, bevel bottom) for each meridian, necessary accuracy can be secured (for example, calculation or data calculation of a spherical curve). If it can be obtained, the surface inclination at the bevel position can be obtained.)

<Control Unit> FIG. 8 is a schematic block diagram showing a control system of the apparatus. A control unit 600 controls the entire apparatus, and is connected to the display unit 10, the input unit 11, and each photo sensor. Further, motors for movement and rotation are connected via drivers 620-628. The drivers 622 and 625 connected to the servo motor 310R for the lens grinding unit 300R and the servo motor 310L for the lens grinding unit 300L serve as the servo motor 310 for processing.
The amounts of rotation torque of R and 310L are detected, respectively, and are fed back to the control unit 600. The driver 628 detects the load current of the DC motor 103 and feeds back to the control unit 600. The control unit 600 uses the information for controlling the movement of the lens grinding units 300R and 300L, controlling the rotation of the lens, and controlling the lens chuck pressure.

Reference numeral 601 denotes an interface circuit used for transmitting and receiving data.
(See JP-A-4-93164), a host computer 651 for managing lens processing information, a bar code scanner 652, and the like. A main program memory 602 stores a program for operating the apparatus, and a data memory 603 stores input data, lens shape measurement data, and the like.

The operation of the apparatus having the above configuration will be described. Here, a description will be given of the operation when a large number of non-prescription sunglass lenses of the same specification are processed in the same shape.

The shapes of various eyeglass frames for inserting the sunglass lenses (hereinafter referred to as lenses) are measured in advance by a lens frame shape measuring device 650, and the respective lens data are transmitted to the host computer 651. The lens shape data is managed by the host computer 651. In addition, data on the lens shape, such as lens thickness, is also stored in the host computer.
Tab 651. At the time of lens processing, the barcode scanner 652 connected to the present apparatus reads the worksheet of the barcode attached to the lens to be processed (the worksheet of the barcode has the same specifications for processing with the same lens shape). Are bundled in lots and attached to each lot.) The data on the lens shape such as the thickness of the lens and the lens shape data indicated on the work slip are stored in the host computer 6.
The data is read from the management database 51 and transferred to the data memory 603.

When processing is performed for the first time using the transferred lens shape data, the measurement mode is switched to the “lens measurement” mode by the switch 11 e of the input unit 11. When the lens to be processed is placed on the chuck shaft 152 side and the start switch 11i is pressed, the chuck shaft 121 is lowered to chuck the lens to be processed. After that, the lens measurement is started.

The control unit 600 operates the lens shape measuring unit 400 based on the lens shape data to measure the shape of the front surface of the lens. The measurement is performed at two points on the front surface of the lens by using a two-dimensional first measurement point and a second measurement point based on lens shape (eyeglass frame) data. The first measurement point is, for example, the position of the top of the bevel, which is the final outer peripheral portion. I do.

The bevel calculation will be described. When forming a bevel on a sunglass lens without a certain degree of thickness,
In this embodiment, in order to make the beveled state look good, in this embodiment, processing is performed so that the vertex of the bevel is located substantially at the center of the lens edge. If there is no curve in the lens to be processed, the thickness of the edge of the lens that has been lens-shaped is constant, but the lens for sunglasses has a curve, so if the lens surface is inclined, the lens edge will be thicker accordingly. Become. In the bevel calculation, based on the edge positions of the first and second measurement points and the thickness at the center of the lens, data obtained by correcting the change in the thickness is obtained to obtain the bevel locus data. That is, as shown in FIG. 9, a point A obtained by two lens measurements
Considering the lens surface of point and point B approximately as a straight line,
The inclination θ of the front surface of the lens at the periphery of the processed lens is obtained. A correction coefficient is determined in advance in accordance with the inclination θ of the front surface of the lens, and the position of the bevel apex can be obtained from the position of the first measurement point using the correction coefficient.

Further, it can be obtained as follows. When the thickness of the lens to be processed is constant, the inclination of the front surface and the rear surface of the lens is the same, so that the lens thickness t (for example, 2.2 m
With respect to m), the edge thickness t ′ on the inner side of the bevel height from the top of the bevel can be easily obtained by t ′ = t / cos θ. If the edge thickness based on the lens shape data is obtained corresponding to each radial angle, the bevel apex locus data located at the center thereof can be obtained.

When the bevel locus data is obtained, processing data converted into inter-axis distance data between the lens rotation axis and the grinding wheel rotation axis for lens processing is obtained. The processed data is stored in the data memory 603, and is read out and used at the time of processing.

When the operation of the lens measurement of the apparatus is completed, the "lens measurement" mode is released by the switch 11e, the mode is shifted to the processing mode, and the processing is started by pressing the start switch 11i. Note that the measurement mode switching signal and the start signal may be input by a key operation on the host computer 651 side instead of operating the switch of the input unit 11.

First, rough processing is performed by a processing start signal. The control unit 600 includes servo motors 310R and 31.
0L is driven to rotate both grindstone groups of the lens grinding units 300R and 300L. Further, the controller 600 drives the left and right pulse motors 204R and 204L to move down the upper and lower slide bases 210 so that the left and right coarse grinding wheels 30 are both at the height of the lens to be processed. Thereafter, the pulse motors 214R and 214L are rotated to slide the lens grinding units 300R and 300L toward the lens to be processed, respectively.
By rotating 56 in synchronization, the lens to be processed chucked by the chuck shafts 121 and 152 is rotated. The left and right coarse grinding stones 30 move toward the lens to be processed while rotating, thereby gradually grinding the lens from two directions. Coarse whetstone 3
The amount of movement of the zero toward the lens is controlled independently for each of the left and right based on the processing data. In the apparatus of the embodiment, since the center of the chuck axis of the lens and the axis of the rotating shaft of the right and left grindstone groups are arranged on a straight line, the movement of the left and right coarse grindstones 30 is based on the shape information shifted by 180 degrees. Done.

When the roughing is completed, the process proceeds to the bevel finishing by the medium finishing whetstone 31 and the precision finishing whetstone 34. After detaching both coarse grindstones 30 from the lens, the control unit 600 calls up the bevel processing data stored in the data memory 603, and based on the bevel processing data, calls out the four bevel grooves of the medium finish grindstone 31 and the precision finish grindstone 34. Of the lens grinding unit 30 so that one of them becomes a bevel position formed on the lens to be processed.
Move 0L, 300R. In processing the first lens to be processed, the bevel groove 31a and the bevel groove 34a are used, respectively. The control unit 600 moves the rotating intermediate finishing grindstone 31 in the direction of the lens to be processed, presses the bevel groove 31a against the lens and grinds, and finishes the intermediate finishing processing at the initial rotation position (remaining a processing allowance for precision finishing). Is completed, the lens starts rotating. During the rotation of the lens, the medium finishing whetstone 31 based on the beveling data for medium finishing
To complete the semi-finishing operation.
If the lens rotates １ ／ during the semi-finishing,
Next, the precision finishing whetstone 34 is moved in the lens direction, and the part subjected to the semi-finishing is further subjected to the precision processing by the bevel groove 34a. The control unit 600 controls the movement of the precision finishing grindstone 34 in the axial direction and the lens direction based on the bevel processing data for precision finishing, and performs processing so that processing is completed. At this time, the processing allowance for semi-finishing
m) (approx. The finishing whetstone 34 can be processed so that one rotation of the lens can sufficiently complete the processing. That is, when the lens to be processed makes a total of 1.5 rotations, all the processing up to the precision finishing is completed.

By processing the semi-finished part with a fine finishing whetstone having a finer grain size,
A good finished surface can be ensured by eliminating lens edge burrs that are easily formed in the case of a glass lens. In this precision finishing process, instead of waiting for the previous semi-finishing process to finish the entire circumference, processing is not started until the part where the semi-finishing process has been performed reaches the position where the precision finishing process can be performed. Therefore, the processing time is reduced by that amount, and the processing can be performed efficiently. That is, in the case of starting the processing by the precision finishing whetstone after the entire finishing of the semi-finishing processing, at least two rotations of the lens are necessary. You just need to rotate.

Further, by performing the finishing in two stages, the medium finishing and the precision finishing, the wear of the grindstone can be dispersed, and the precision finishing which is the final finishing requires a small processing amount. The wear is smaller than that of the medium finish grindstone 31 side, and even if a large number of lenses are continuously processed, a decrease in size accuracy due to the grindstone wear can be extremely reduced. According to the experiment of the inventor, when the machining allowance by the semi-finishing whetstone was 1.5 mm and the machining allowance by the precision finishing whetstone was 0.2 mm, the abrasion of the medium finishing whetstone when machining about 1,000 lenses was about 0 mm. While it was 0.05 mm, the abrasion of the precision finish whetstone was about 0.01 mm or less, and it was confirmed that the size accuracy was sufficiently maintained.

When the processing of one lens to be processed is completed as described above, the chuck shaft 121 is raised, so that the processed lens is removed and the processing proceeds to the next lens.
The control unit 600 reads the previously stored processing data, and performs the rough processing and the finishing processing in the processing mode while omitting the lens measurement. As a result, the time for performing the lens measurement for each processing can be saved, and the processing time can be reduced for each processing.
In the processing of sunglass lenses, a large number of lenses having the same specifications are often processed in succession with the same lens shape, so that omitting the time for lens measurement can greatly reduce the total time.

The processing data is also stored in the host computer 6.
On the 51 side, the lens specification data and the lens shape data are associated,
A plurality of identification codes may be stored and managed. In this case, even when the lot of the lens to be processed changes, it is possible to recall the processing data corresponding to the instruction on the barcode worksheet and continuously perform the processing in the processing mode without performing the lens measurement. it can. However, even if a plurality of processing data is not stored, in the processing of sunglass lenses, many lenses of the same specification are processed in succession with the same lens shape. In this case, there is not much burden, so it is sufficient to rewrite the processing data each time.

In the finishing processing after the rough processing of the second lens to be processed, the control section 600 controls so as to perform processing with the bevel groove 31b of the medium finishing grindstone 31 and the bevel groove 34b of the precision finishing grindstone 34. After that, the bevel groove 31c and the bevel groove 34c for the third lens processing, and the bevel groove for the processing each time the lens to be processed changes, such as the bevel groove 31d and the bevel groove 34d for the fourth lens processing, respectively. I do. As a result, the wear of the grindstone can be reduced to 1/4 in the embodiment, and the life of the grindstone can be prolonged, as compared with the case of machining with only one bevel groove.
Therefore, even if a large number of lenses are continuously processed, a reduction in size accuracy can be suppressed as much as possible.

Since the finished size of the lens becomes large due to abrasion of the grindstone due to the repetition of the processing, if the size adjustment is necessary, the following is performed. By pressing the menu switch 11d, a parameter setting screen 700 as shown in FIG. An item for size adjustment is selected by an arrow cursor 701 displayed on the left side of the screen. The items are four bevel grooves 31a to 31d of the medium finishing whetstone 31 and four bevel grooves 3 of the precision finishing whetstone 34.
4a to 34d, and can be selected for each bevel groove. To change the setting size of the selected item, the value displayed on the right side is increased or decreased by the switch 11c and input. Similarly, the bevel positions of the medium finishing whetstone 31 and the precision finishing whetstone 34 can be adjusted for each individual bevel groove. When the parameter setting screen 700 is closed, the data stored in the adjustment value memory 604 is rewritten with the adjusted value. Note that these inputs can also be performed under the control of the host computer 651 connected to the apparatus main body. The control unit 600 controls the processing by each bevel groove based on the rewritten data. This allows
Even if the degree of wear of the grindstone is different for each bevel groove, it can be handled by appropriately setting each.

[0048]

As described above, according to the present invention,
Even if a large number of lenses are processed, processing can be performed efficiently with extremely small size errors.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an overall configuration of an apparatus according to an embodiment.

FIG. 2 is a diagram showing a configuration of a grindstone.

FIG. 3 is a diagram illustrating a configuration of a lens chuck upper portion and a lens chuck lower portion.

FIG. 4 is a diagram illustrating a moving mechanism of a lens grinding unit 300R.

FIG. 5 is a diagram illustrating a mechanism for moving the lens grinding unit 300R left and right and detecting processing completion.

FIG. 6 is a side sectional view showing a configuration of a lens grinding unit 300R.

FIG. 7 is a diagram illustrating a lens thickness measurement unit 400.

FIG. 8 is a schematic block diagram showing a control system of the apparatus.

FIG. 9 is a diagram illustrating bevel calculation according to the embodiment.

FIG. 10 is a diagram showing an example of a setting screen when performing size adjustment and the like.

[Explanation of symbols]

 Reference Signs List 10 display unit 11 input unit 31 medium finishing grindstone 31a, 31b, 31c, 31d bevel groove 34 precision finishing grindstone 34a, 34b, 34c, 34d bevel groove 300R, 300L lens grinding unit 600 control unit

Claims (6)

[Claims] 1. An eyeglass lens grinding apparatus for grinding a lens to be processed so as to fit an eyeglass frame, comprising: a finishing whetstone having a plurality of bevel grooves for forming a bevel on a periphery of the roughly processed lens; Control means for processing so as to sequentially change the bevel groove of the finishing whetstone to be used. 2. A spectacle lens grinding apparatus according to claim 1, wherein said finishing whetstone has a plurality of bevel grooves provided on one finishing whetstone. 3. The spectacle lens grinding apparatus according to claim 1, wherein the finishing whetstone has a plurality of finishing whetstones of a semi-finishing whetstone and a precision finishing whetstone, each of which has a plurality of bevel grooves. Grinding equipment. 4. The eyeglass lens grinding apparatus according to claim 3, further comprising: a grinding wheel rotating shaft provided on each of said semi-finished grinding wheel and the precision finishing grinding wheel; and moving means for moving each grinding wheel rotating shaft with respect to the lens to be processed. An eyeglass lens grinding apparatus characterized by comprising: 5. The spectacle lens grinding apparatus according to claim 4, further comprising: a control unit that controls a moving unit to perform precision finishing with a precision finishing whetstone on a portion where the intermediate finishing has been completed during processing with the intermediate finishing whetstone. An eyeglass lens grinding apparatus characterized by having: 6. The spectacle lens grinding apparatus according to claim 1, further comprising size adjusting means for adjusting a finished size of the lens to be processed for each of a plurality of bevel grooves of the finishing whetstone. Grinding equipment.