JPH11216651A - Eyeglass lens grinding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To arrange a large number of grinding wheels without increasing the length of a lens chuck shaft by providing a grinding wheel switching means which is provided with a plurality of grinding wheel rotary shafts having a grinding wheel for working a lens, and selectively moves the grinding wheel rotary shaft to the prescribed position. SOLUTION: After the rough grinding, a lens to be worked is detached from rough grinding wheels 440, 441, and a turret part 410 is rotated so that a grinding wheel rotary shaft 411c provided with finishing grinding wheels 450, 451 is at the prescribed working position. A lens grinding part is moved in the X-axis direction so that a V-shaped groove of the finishing grinding wheel 450 for glass or the finishing grinding wheel 451 for plastic is at the grinding position of a V-shaped groove to be formed in the lens according to the lens material. The V-shaped groove is finished by controlling the rotation and the movement in the Y-axis direction of the lens to be ground, and controlling the movement of the lens grinding part in the X-axis direction based on the V-shaped groove machining data.

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 peripheral edge of an eyeglass lens so as to fit an eyeglass frame.

[0002]

2. Description of the Related Art A standard grinding wheel configuration in a conventional apparatus is as follows.
It has a three-piece structure consisting of a rough grindstone for glass, a rough grindstone for plastic, and a finishing grindstone, and these grindstones are generally attached to a single rotating shaft at predetermined positions. Processing of the lens to be processed, after holding the lens to be processed by the lens chuck shaft rotatably provided on the carriage, moving the carriage in the axial direction and placing the lens to be processed at the grindstone position according to the processing,
The carriage is rotated around a rotation axis, and the lens to be processed is pressed against a grindstone for processing.

By the way, recently, with the spread of so-called two-point and nyroll frames, a grindstone for flat mirror surface processing is also required as a standard function. Furthermore, for the reason of fashion, mirror processing of the beveled surface is also demanded. In the case of performing mirror finishing, which is a very small amount of processing, there is a portion where mirror finishing cannot be performed unless the shapes of the finishing whetstone and the mirror whetstone match exactly. Although the wear of the finishing whetstone is scarce in the processing of plastic, the degree of wear is large in the processing of glass. Conventionally, finishing is performed on both glass and plastic using a common finishing whetstone. However, in order to cope with mirror finishing, it is desirable to provide a dedicated finishing whetstone corresponding to each lens material.

[0004]

However, if the number of grindstones is increased as described above and these are provided on one grindstone shaft as in the prior art, the overall width of the grindstone increases and the lens chuck shaft also becomes longer. There is a need. This inevitably causes problems such as an increase in the lateral width of the apparatus itself, a decrease in mechanical rigidity due to an increase in the length of the lens chuck shaft, and a decrease in processing accuracy due to this.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a spectacle lens grinding apparatus capable of coping with the arrangement of a large number of grindstones without lengthening a lens chuck shaft.

[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 the periphery of a spectacle lens, processing data input means for obtaining processing data for grinding the periphery of a lens to be processed, and a lens rotating for clamping the lens to be processed. Axis, a grinding wheel switching means having a plurality of grinding wheel rotation shafts having a grinding wheel for lens processing, and selectively moving the grinding wheel rotation shaft to a predetermined processing position,
Control means for operating a grinding wheel switching means based on the processing data and the processing sequence.

(2) In the eyeglass lens grinding apparatus of (1), the whetstone switching means includes a turret plate for holding the whetstone rotating shaft, and a rotating means for rotating the turret plate. .

(3) In the eyeglass lens grinding apparatus of (2), the whetstone switching means is further provided with a drive mechanism sharing a motor for driving each whetstone rotating shaft.

(4) In the eyeglass lens grinding apparatus of (1), a finishing wheel for plastic and a finishing wheel for glass are separately arranged on the plurality of rotating shafts.

(5) In the spectacle lens grinding apparatus of (1), a coarse grindstone, a finish grindstone and a mirror grindstone corresponding to the lens material are dispersedly provided on the plurality of grindstone rotating shafts. .

(6) In the eyeglass lens grinding apparatus of (1), one of the plurality of grinding wheel rotation shafts is provided with a mounting portion for mounting a grindstone grinding wheel.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a schematic configuration when the inside of the device according to the present invention is viewed from the front. FIG. 2 is a diagram showing a schematic configuration when the inside of the apparatus is viewed from the right side.

Reference numeral 1 denotes a first base. On the first base 1, a second base 2 on which each mechanism is disposed is erected and fixed. On the second base 2, a lens chuck 3, a lens grinding unit 4 having a large number of grindstones, and a lens shape measuring unit 5 for measuring a lens shape along a processing shape are arranged.
Hereinafter, the main components will be described.

<Lens Chuck Part> A Y table 300 that moves in the up-down direction (hereinafter, referred to as the Y-axis direction) is arranged on the upper half side of the second base 2. Y table 300
Has a substantially U-shape when viewed from above, and has a shape in which a right block 300R and a left block 300L protrude forward and are connected behind the second base 2. Two guide shafts 301 fixed to the left and right side surfaces of the second base 2 are inserted through the right block 300R and the left block 300L. The Y table 300 is guided by the guide shafts 301 and driven by a Y-axis motor 302. It moves in the Y-axis direction. The Y-axis motor 302 is fixedly arranged on the left side surface of the second base 2, and a ball screw 303 is connected to a rotation shaft thereof. A mounting member 304 extending from the left block 300L is screwed into the ball screw 303, and the Y table 3 is rotated by forward and reverse rotation of the Y-axis motor 302.
00 moves in the Y-axis direction. A spring (not shown) is stretched between the second base 2 and the Y table 300 to cancel the downward load on the Y table 300 to facilitate the movement.

A lens chuck shaft 310L is rotatably held in front of the left block 300L. Further, a pulse motor 305 is fixedly arranged on the front side of the left block 300L, and the rotation of the pulse motor 305 is controlled by a pulley 306 attached to its rotating shaft, a timing belt 307.
Is transmitted to the pulley 308 attached to the end of the lens chuck shaft 310L through the lens chuck shaft 310L.
L rotates.

On the other hand, on the front side of the right block 300R, a chuck table 321 slidable on two guide rails 320 extending left and right, and the chuck table 321
Is provided with a pulse motor 330 for moving. A ball screw 331 is provided on the rotation axis of the pulse motor 330.
Are connected, and a connecting piece 321 a extending upward from the chuck table 321 is screwed into the ball screw 331. With this configuration, when the pulse motor 330 is rotated forward and backward, the chuck table 321 moves left and right, and the lens L to be processed can be held between the lens chuck shaft 310R and the lens chuck shaft 310L rotatably held by the chuck table 321. .

As with the lens chuck shaft 310L, the rotation of the pulse motor 322 fixed to the chuck table 321 is applied to the pulley 323 by the lens chuck shaft 310R.
It is transmitted via the timing belt 324 and the pulley 325.

<Lens Grinding Part> Two parallel guide rails 403 extending in the left-right direction (hereinafter referred to as the X-axis direction) are fixed on the bottom plate of the second base 2 by mounting members 401 and 402. The X-movement support base 400 is disposed so as to slide with respect to the guide rail 403 in the X-axis direction. A turret 410 described below is attached to the X-movement support base 400. An X-axis motor 405 for moving the X-movement support base 400 is fixed behind the second base 2, and a ball screw 406 is connected to the rotation shaft. The end of the ball screw 406 is rotatably held behind the second base 2. A connection member 400 a connected to the X-movement support 400 is screwed into the ball screw 406, and the X-movement support 400 moves in the X-axis direction by rotation of the X-axis motor 405.

A turret section 410 is provided from the X-movement support base 400.
A holding plate 400b for rotatably holding is extended upward. The turret unit 410 has four grinding wheel rotating shafts 411a to 411a.
411d (in FIG. 1, the grindstone rotating shaft 411d is not shown) is rotatably supported via a bearing, and each of the grindstone rotating shafts 411a to 411d has a large number of grindstones (the grindstone configuration will be described later). Is attached. Each of the grindstone rotating shafts 411a to 411d is a turret part 41.
Zero rotation centers are provided at equal intervals (90-degree intervals) on the same circumference.

The turret 410, the grinding wheel rotating shaft 411a-
The rotation mechanism of 411d will be described with reference to FIGS. FIG. 3 is a sectional view taken along line AA of the turret portion 410 with respect to FIG. 2, and FIG. 4 is a sectional view taken along line BB of the turret portion 410 with respect to FIG.
A turret shaft 413 fixed to the turret 410 via two bearings 412 is rotatably held on the holding plate 400b. At the rear end of the turret shaft 413, the pulley 4
14 are attached. A motor 416 for rotating the turret 410 is fixed to the holding plate 400b by a mounting plate 415, and a pulley 417 is mounted on a rotating shaft thereof. Pulley 417 and pulley 4
A timing belt 418 is stretched between the turrets 14, and the turret 410 is rotated by the rotation of the motor 416.
Thereby, the grindstone provided on the grindstone rotating shafts 411a to 411d is moved to a predetermined processing position (the lens chuck shaft 310R,
The position connecting the grinding wheel 310L and the grinding wheel rotation axis can be selectively switched to a position parallel to the Y-axis direction).

Each of the grindstone rotating shafts 411a to 411d is connected to the turret 41 via bearings 420a to 420d, respectively.
The gears 421a to 421d are fixed at the rear end thereof so as to be rotatable. A main rotating shaft 422 is rotatably held by two bearings 423 at the centers of the turret portion 410 and the turret shaft 413, and a gear 42 is provided at an end of the main rotating shaft 422 on the grindstone side.
A gear 424 meshing with 1a to 421d is fixed. A pulley 425 is attached to the opposite end of the main rotation shaft 422. A motor 431 for rotating the grindstone is fixed to the holding plate 400b by a mounting plate 430, and a pulley 432 is mounted on a rotating shaft thereof. A timing belt 433 is stretched between the pulleys 324 and 425. When the motor 431 is rotated by this configuration, each of the grinding wheel rotating shafts 411a to 411d
The grindstone provided for the wheel rotates.

The configuration of the grindstone provided on each of the grindstone rotating shafts 411a to 411d will be described (see FIGS. 3 and 4). A rough grindstone 440 for glass and a rough grindstone 441 for plastic are attached to the grindstone rotating shaft 411a. Whetstone rotating shaft 411
A finishing whetstone 450 for glass, a finishing whetstone 451 for plastic, and a finishing whetstone 452 for mirror finishing are attached to c, and these finishing whetstones are the same shape and have a bevel groove for beveling and a flat surface for flat processing. have. A standard chamfering whetstone 460 having a grain size of 400 is provided on the whetstone rotating shaft 411b.
And a specular chamfering grindstone 461 having a grain size of 3000, both having conical surfaces 460a and 461a for chamfering the front surface of the lens and conical surfaces 460b and 461b for chamfering the rear surface of the lens. Each of the above grindstones has a relatively small diameter of about 60 mm, so that the machining accuracy is improved and the durability of the grindstone is ensured.

The remaining wheel rotation shaft 411d has a diameter of 20 mm.
A shaft 471 having a groove grinding wheel 470 having a thickness of about 1 mm and a thickness of about 1 mm is connected. The shaft 471 is provided with a whetstone rotating shaft 4 so that grooving according to the lens curve can be performed.
The turret 410 is rotatably held at 10 degrees with respect to the 11d axis. Shaft 471
A bevel gear 472 is attached to the end face of the wheel, and the bevel gear 473 attached to the tip of the grinding wheel rotating shaft 411d meshes with the bevel gear 472. Thereby, the grinding wheel rotating shaft 411
The rotation of d is transmitted to the grinding wheel 470.

As described above, even if a large number of whetstones are dispersed on a plurality of whetstone rotating shafts, the width of the whetstone on one whetstone rotating shaft need not be increased. In the present embodiment, the length can be further reduced as compared with the conventional standard three-wheel configuration.

<Lens Shape Measuring Unit> FIG. 5 is a schematic configuration diagram of the lens shape measuring unit 5. A motor 502 (not shown in FIG. 5) is provided on a rotation shaft 501 of the measurement arm 500.
Is attached, and the measuring arm 500 is
Rotates. A measuring element 503a for measuring the rear surface of the lens to be processed and a measuring element 5 for measuring the front surface are provided at the tip of the measuring arm 500.
03b is attached. Reference numeral 504 denotes a sensor plate, and rotation of the measurement arm 500 is controlled by the sensor plate and photo switches 505 and 506. The amount of rotation of the measuring arm 500 is detected by the potentiometer 508 via the rope 507, and the shape of the lens to be processed is measured from the amount of rotation. The configuration of the lens shape measuring unit 5 is described in
Since it is basically the same as that described in, for example, Japanese Patent Application No. 603, please refer to this for details.

The measurement of the lens shape is not limited to the present embodiment. The measuring element for measuring the front surface of the lens and the measuring element for measuring the rear surface are attached to separate arms, and the two measuring elements are simultaneously applied to the lens to be processed. It may be configured to detect the respective movement amounts while making contact.

<Control System> FIG. 6 is a block diagram of the control system of the present apparatus. Here, only the main configuration is shown. 1
Reference numeral 00 denotes a control unit for controlling the entire apparatus, a display unit 10 for displaying processing information, and an input unit 1 having various switches.
1, an eyeglass frame measuring device 12 (see Japanese Patent Application Laid-Open No. 4-93164), a main program memory 101 storing a processing sequence program, and a data memory 102 storing input data and lens measurement data are connected. .
In addition, each motor is connected via drivers 110 to 117.

Next, the operation of the apparatus having the above configuration will be described. The processor writes the data of the shape of the spectacle frame (including the case of a template or a dummy lens corresponding to a two-point or nyroll frame) measured by the spectacle frame measuring device 12 (hereinafter referred to as a lens shape) to the apparatus main body. To the side. The input data is transferred to and stored in the data memory 102, and the display unit 10 displays a lens shape based on the input data. The processor inputs layout data such as the PD value of the wearer, the FPD value of the glasses, and the height data of the optical center by operating the switches 11a to 11d of the input unit 11.

The following processing conditions are set for the switch 11
Operate e to 11h and input. Whether the material of the lens to be processed is glass or plastic (including polycarbonate) is specified by the switch 11e. A switch 11f is used to specify a processing mode for performing beveling, flat processing, and grooving according to the spectacle frame selected by the wearer. Whether or not to chamfer the end face after finishing processing is designated by the switch 11g. In the case of chamfering, the size can be further set in three steps in a predetermined amount.
When the lens is made of plastic, the switch 11h is used to select whether or not to perform mirror finishing on the finished processing surface.

When the processing conditions have been input, the processor presses the CHUCK switch 11j after attaching the lens L to which the processing jig is attached to the lens chuck shaft 310L. The control unit 100 drives the motor 330 to move the lens chuck shaft 310R and chuck the lens L to be processed. When the preparation for processing is completed, press the START switch 11k to start processing. The control unit 100 sequentially performs the lens shape measurement and the specified processing according to the processing sequence program based on the input data, processing conditions, and the like.

The control unit 100 obtains machining radius information based on the input frame data and layout data (Japanese Patent Laid-Open No.
-212661 etc.). Subsequently, the Y-axis motor 302 is rotated based on the processing
00 is moved to the lens shape measurement unit 5 side, and the lens L to be processed is placed at the measurement position. Thereafter, the lens shape measuring unit 5 is operated to bring the tracing stylus 503a into contact with the rear surface of the lens, and then the motor 305 and the motor 322 are rotated in synchronization with each other to rotate the processed lens L once, thereby obtaining the processing radius information. Table 30 based on the virtual shape after finishing based on
By moving 0 in the Y-axis direction, the lens movement is changed. The amount of movement of the tracing stylus 503a at this time is obtained by the potentiometer 508, whereby the rear surface shape of the lens according to the processing radius information is measured. The tracing stylus 503b is brought into contact with the front surface of the lens, and the shape of the front surface of the lens is similarly measured.

After the lens shape measurement is completed, grinding is performed in accordance with the designated processing mode. First, the case of the beveling mode will be described, and only the differences between the flat processing mode and the grooving mode will be described.

(A) Beveling mode In the beveling mode, the control section 100 obtains beveling data according to a predetermined program based on the obtained lens shape measurement data. The bevel processing data is calculated by a method of obtaining a curve value from a lens front surface curve or a lens rear surface curve, a method of dividing a lens edge thickness, a method of combining these, and the like.

When the bevel processing data can be calculated, the processing starts from the rough processing. When the grindstone rotating shaft 411a including the coarse grindstone is not at the predetermined processing position, the control unit 100
Drives and controls the motor 416 to rotate the turret 410, and places the grindstone rotating shaft 411a at a predetermined processing position. The X-axis motor 405 is driven and controlled such that the coarse grindstone 440 for glass is located at the lens position when the lens material is designated as glass, and the coarse grindstone 441 for plastic is designated when the lens material is designated as plastic. The entire grinding unit 4 moves in the X-axis direction. Then, the grinding wheel rotation motor 431
After the grindstone is rotated by the drive of, the rough processing is performed by controlling the movement of the Y table 300 in the Y-axis direction while rotating the lens L to be processed based on the processing data.

Subsequently, the process proceeds to finishing. After the lens L to be processed is detached from the coarse grindstone, the turret 4 is moved so that the grindstone rotating shaft 411a including the finishing grindstone comes to a predetermined processing position.
Rotate 00. In addition, the lens grinding unit 4 is controlled to move in the X-axis direction so that the bevel groove of the finishing grindstone 450 or the finishing grindstone 451 is located at a beveling position formed on the lens according to the lens material. Thereafter, the rotation of the lens to be processed and the movement in the Y-axis direction are controlled based on the bevel processing data, and the lens grinding unit 4 is controlled to move in the X-axis direction to perform the bevel finishing.

When the lens material is plastic and mirror processing is designated, a finishing whetstone 452 for mirror processing is further provided.
Move to processing by. The control unit 10 performs mirror surface processing data (Japanese Patent Application No. 9-98219 filed by the present applicant) based on the mirror surface processing allowance.
After that, the rotation of the lens to be processed, the movement in the Y-axis direction, and the movement of the lens grinding unit 4 in the X-axis direction are controlled based on this data.

When the lens material is plastic and chamfering is specified, the control unit 10 obtains chamfering data. The chamfering data is based on the shape data of the front and rear surfaces of the lens obtained by the measurement of the lens shape measuring unit 5, the bevel position data based on the beveling data, and the data of the amount of chamfering. Is calculated (Japanese Patent Application No. 9-414 filed by the present applicant).
No. 77 can be used).

The control unit 100 rotates the turret unit 400 so that the grindstone rotating shaft 411b having the chamfering grindstone comes to a predetermined processing position. After that, the mirror is moved in the X-axis direction so that the conical surface 460a of the standard chamfering grindstone 460 or the conical surface 461a of the standard chamfering grindstone 460 comes to the machining position depending on whether or not mirroring is designated, and the lens is rotated based on the chamfering machining data. The movement in the X-axis direction and the Y-axis direction is controlled while performing chamfering on the front surface of the lens. Similarly, the conical surface 4 of the standard chamfering grindstone 460 depends on whether or not mirror processing is specified.
Using the 60b or the conical surface 461b of the mirror chamfering grindstone 461, chamfering on the rear surface side of the lens is performed.

(B) Flat processing mode As in the case of the bevel processing, the coarse grindstone 440 for glass or the coarse grindstone 441 for plastic is used in accordance with the designation of the lens material.
Of the turret unit 410 and X
The roughing is performed by moving the grindstone in the axial direction and controlling the movement of the Y table 300 in the Y-axis direction while rotating the lens L to be processed based on the processing data. afterwards,
The arrangement of the grindstones is changed to the flat surface of the glass finish grindstone 450 or the plastic finish grindstone 451, and the respective parts are controlled based on the processing data to perform the finish processing.

When the lens material is plastic, mirror processing is performed using the flat surface of the finishing grindstone 452 for mirror processing according to the presence or absence of mirror processing, and bevel processing mode is performed according to the presence or absence of chamfer processing. The chamfering process is performed by using the standard chamfering grindstone 460 or the standard chamfering grindstone 460 in the same manner as in the above.

(C) Grooving Mode In the grooving mode, the control unit 100 calculates grooving data based on the groove position and the amount of processing in the groove depth direction obtained by the same calculation as the beveling data. I do. In this case, it is more effective to provide a function of simulating the virtual lens edge shape after grooving based on the grooving data based on the lens shape measurement data.

The processing up to the flat finishing is performed in the same manner as in the flat processing mode. In the case of plastic, each processing is further executed in accordance with designation of mirror finishing and chamfering. When these operations are completed, the turret unit 410 is rotated and the groove grinding wheel 4 is rotated.
70 is placed at a predetermined processing position with respect to the lens chuck axis. Then, while rotating the lens to be processed, the movement in the X-axis direction and the Y-axis direction is controlled based on the grooving data,
Groove processing is performed on the peripheral edge of the lens by the rotating grindstone 470.

[0044]

As described above, according to the present invention,
Even when a large number of different types of grindstones are required, they can be dispersed and attached to a plurality of grindstone rotating shafts for processing, so that the grindstone width on one shaft does not need to be increased. Therefore, since the lens chuck shaft does not need to be long, good machining can be performed without lowering the mechanical rigidity and the machining accuracy. Further, the width of the apparatus body in the axial direction of the lens chuck is suppressed, which is advantageous in terms of installation space. Further, since the driving force for rotating the grooving grindstone is also obtained from the main shaft for rotating the other grindstone, the machining can be performed efficiently without providing an extra drive mechanism.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration when the inside of a device according to an embodiment is viewed from the front.

FIG. 2 is a diagram showing a schematic configuration when the inside of the apparatus is viewed from the right side.

FIG. 3 is a sectional view of the turret taken along line AA of FIG. 2;

FIG. 4 is a sectional view of the turret taken along line BB of FIG. 2;

FIG. 5 is a diagram showing a schematic configuration of a lens shape measuring unit.

FIG. 6 is a block diagram illustrating a main configuration of a control system of the apparatus.

[Explanation of symbols]

 Reference Signs List 3 lens chuck unit 4 lens grinding unit 11 input unit 12 spectacle frame measuring device 100 control unit 101 main program memory 102 data memory 310L, 310R lens chuck shaft 410 turret unit 411a, 411b, 411c, 411d wheel rotating shaft 416 motor

Claims (6)

[Claims] 1. An eyeglass lens grinding apparatus for grinding a peripheral edge of an eyeglass lens, processing data input means for obtaining processing data for grinding the peripheral edge of a lens to be processed, and a lens rotating shaft for holding the lens to be processed. A plurality of grindstone rotating shafts having a grinding wheel for lens processing, a grindstone switching means for selectively moving the grindstone rotating shaft to a predetermined machining position, and operating the grindstone switching means based on the machining data and the machining sequence. An eyeglass lens grinding apparatus comprising: a control unit. 2. A spectacle lens grinding apparatus according to claim 1, wherein said whetstone switching means comprises: a turret plate for holding said whetstone rotating shaft; and a rotating means for rotating said turret plate. Lens grinding equipment. 3. The spectacle lens grinding apparatus according to claim 2, wherein said whetstone switching means further includes a drive mechanism sharing a motor for driving each of the whetstone rotating shafts. 4. The spectacle lens grinding apparatus according to claim 1, wherein a finishing wheel for plastic and a finishing wheel for glass are separately disposed on the plurality of rotating wheels. 5. A spectacle lens grinding apparatus according to claim 1, wherein a coarse grindstone, a finish grindstone and a mirror grindstone according to the lens material are dispersedly provided on said plurality of grindstone rotating shafts. Lens grinding equipment. 6. An eyeglass lens grinding apparatus according to claim 1, wherein one of said plurality of whetstone rotating shafts is provided with a mounting portion for mounting a grooving whetstone. .