JPS60123259A - Lens peripheral edge machining device - Google Patents

Abstract

PURPOSE:To machine a lens with a labour-saving manner without the center of curvature of the curve of the lens being shifted largely from the optical axis, by measuring the edge thickness of the lens and as well by automatically forming a suitable bevel curve in the lens. CONSTITUTION:If distances aL1, bL1, cL1, dL1 from a horizontal reference position S, and values aL1+aD, bL1+bD, cL1+cD, dL1+dD which are in consideration with the thickness of a spectacle lens, are taken with respect to points (a, b, c, d) corresponding to the rotating angles of the spectacle lens, the developed graph of the lens edge may be obtained by connecting the points (a, b, c, d), in which the inside of a slanted line area that indicates the thickness of the lens edge is an area possible to be formed with a bevel curve. The curve of the surface is specified as a reference, and if a certain rate is specified, the positions Qa, Qb, Qc Qd are obtained by dividing the edge thickness at the points (a, b, c, d) with the specified rate in reference to the surface, and when folded line 100 is obtained in consideration with the inclination of a approximate profile copying line of each adjacent points, this line corresponds to the bevel curve.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a lens periphery processing machine that can automatically form bevels and grooves on the periphery of eyeglass lenses.

(Background of the Invention) In most cases, the peripheral edges of spectacle lenses are processed into a V-shape called a bevel in order to fit into the rim of a spectacle frame.

The degree of curvature of this bevel, that is, the bevel curve, is formed on the peripheral edge of the eyeglass lens so as to match the degree of curvature of the inner circumference of the rim of the eyeglass frame.

This bevel curve is expressed by K (K-523: radius of curvature of R-lens), and a specific value of 4 to 6 K is usually selected.

However, in actual processing, the bevel curve is not selected to match the degree of curvature of the inner circumference of the rim of the glasses frame, but rather the degree of curvature of the inner circumference of the rim of the glasses frame is corrected and matched to the appropriately processed bevel curve. This is often used to frame images in this way. in this case,
After making the head frame of the lens edge processing machine freely swingable in the horizontal direction, the eyeglass lens is dropped onto a ■-shaped grindstone to form a bevel near the center of the edge thickness. We are doing so-called free processing.

However, free machining can process relatively low-power eyeglass lenses with good axial performance if the conditions are right, but it is used for special lenses such as high-power lenses, astigmatic lenses, multifocal lenses, and lenticular lenses. It's difficult.

Even for eyeglass lenses with relatively low power, variations in the bevel position due to changes in the angle of the grindstone groove, the balance of sharpness on the left and right sides of the groove, the smoothness of the horizontal movement of the head, and the balance of the grindstone after sharpening. Machining cannot always be performed as expected due to variations in the bevel position depending on the type of lens, and even experienced machinists often fail, resulting in poor aesthetics and the center of curvature of the bevel curve deviating significantly from the optical axis. When the glasses are worn in a glasses frame, prism errors may occur because the wearer's long-distance line of sight and the optical axis of the glasses lenses are not parallel. There was a drawback.

(Object of the Invention) An object of the present invention is to provide a lens peripheral edge processing machine which is aesthetically improved compared to free processing and which does not deviate the center of curvature of the bevel curve significantly from the optical axis.

(Example) FIGS. 1 to 5 show examples of the present invention. A support shaft 3 is slidably supported in a horizontal direction (in each direction) by a support bearing 2 fixed to a main body frame 1, and a head frame 4 is rotatably attached to the shaft 3 (arrow A).

A recess for chucking the eyeglass lens 5 is formed in the head frame 4, and a shaft 7 for the lens holder 6 and the lens holder is passed through the recess from both sides of the head frame 4, and one end of the lens holder shaft 6 is inserted into the recess. A driving device M8 such as a motor for driving the shaft 6 in the axial direction is connected to the shaft 6, and a squid (not shown in the figure), rubber, etc. for directly pressing the spectacle lens 5 is provided at the other end. On the other hand, the lens holder has a tine shape 9 shaped like the rim of an eyeglass frame attached to one end of the shaft 7, and this tine shape 9 is replaceable. A rubber or the like (not shown) is provided to directly receive the water.

The lens holding shaft 6 and the lens holder shaft 7 are connected to a gear train 10aI.
The lens holder is synchronously rotated by a pulse motor 10 for lens rotation via a transmission device such as a belt 10b (arrow B), and a reference plate 11 having a notch τ is mounted on the shaft 7 to detect the initial position of lens rotation. is fixed, and a photo ink converter 12 is provided on the head frame 4, sandwiching the base fishing plate 11.

In Figure 2, which shows the machine shown in Figure 1 from the rear,
The support shaft 3 passes through a U-shaped portion 4a cut out on the rear side of the head frame 4 so as to include the support shaft 3, thereby supporting it together with the head frame 4. A connecting member 13 is provided which is movable in the horizontal direction (arrow C) along +3, the other end of the connecting member 13 being movable in the horizontal direction (arrow C).

The head frame is connected via a pulse motor 14 for moving the head frame and an electromagnetic clutch 15 to a timing belt 17 that moves horizontally by a pulley 16 fixed to the shaft end of the clutch 15. The initial position of the head frame 4 in the horizontal direction is set by the projecting piece 18 provided at the end of the connecting member 13 shielding the photo ink club 19 provided on the main body frame 1 from light.

On the main frame 1, an assembly grindstone 20 and a V-shaped grindstone 21 for beveling are installed such that their rotational axes are aligned with the support shaft 3. The rotation of the grinding wheels 20° and 21 is performed by a motor (not shown). A knife-shaped receiver 22 having a curved surface with the same curvature as the grindstone 21 is provided on the side of the main frame l to receive the regular mold 9. Although not shown in FIG. 1, a rack 223 is attached to the outside of the frame 220 of the knife-shaped receiver 22Fi, as shown in FIG. 4, and a gear 23 is engaged with the rack 223. Gear 23 is a cylindrical type upper and lower pulse motor.
rotated by the motor 24, thereby the knife-shaped receiver 22
It is configured to move up and down (arrow D). The position before the vertical height reference position of the tray-shaped receiver 22 is detected by emitting light from the photo ink converter 224 attached to the fixed guide 225 side by the shield plate 226 attached to the frame body 220 side. Further, a detection unit 25 for automatically measuring the edge thickness of the eyeglass lens 5 is installed close to the grindstone 20. As shown in FIG. 3 of the detection unit 25, a light shielding member 253 for shielding the photo ink converter 252 from light and a spring 254 are placed in the middle of @251 to which the contactor 250 is fixed.
The eyeglass lens 5 ゛ which has finished hulling is attached to the contactor 2.
The photo ink converter 252 is turned on and off by swinging within the fold-back section 50.

Furthermore, in order to rotate the head frame 4 around the support shaft 30, a wire 26 whose one end is fixed to the connecting member 13 is provided.
is hung on a pulley 27 on the head frame 4 and bent horizontally, and the other end of this wire 26 is fixed to a movable member 29 that moves horizontally by rotation of a screw 28. The screw 28 is connected to a DC motor 31 via gears 30, 30'. Since the weight of the 4 head frames provides a rotational force in the clockwise direction in Figure 1, the DC motor 31, gears 30', 30, screws 28, and movement 1H29
The wire 26 provides a rotational force for causing the head frame 4 to rotate first to the left. head frame 4
In order to detect the rotational position of the encoder 32, an encoder 32 is fixed to the head frame 4, and a small pulley 32a is integrally provided on the rotation axis of the encoder 32, and a small pulley 32a is installed between the pulley 32a and the pulley 13a. A string 32b is attached, and as a result, the encoder 32 rotates in accordance with the rotation of the head frame 4. Further, the initial position of the encoder 32 is detected by illuminating the photointerrupter 4b attached to the head frame 4 with the base plate 13c attached to the connecting member 13.

In this embodiment, the drive unit includes pulse motors 10 and 14.
, 24, a photointerrupter 4b for position detection,
12, 19, 222, 224, and 252 are used in this photointerrupter 4b.

12.19. Instead of 222, 224, 252, other original sensors or sensors such as limit switches can be used. Furthermore, it is also possible to achieve the same function by using a DC motor instead of the pulse motor 10° 14.24, and a pair of encoders for position detection.

Next, an electric control device used in conjunction with the apparatus shown in FIGS. 1 to 4 will be described with reference to FIG. The electric control device 50 includes a selection switch 51a for selecting whether the bevel curve is based on (1) the curve on the front surface of the eyeglass lens or (2) the curve on the back surface of the eyeglass lens, and a measurement start switch 51b. and a comparison designation switch 51c; a predetermined program based on a flowchart to be described later and the distance from the horizontal reference position to the contact 250 of the assembled grindstone 20, V-shaped grindstone 21, and detection unit 25. A first storage unit 52 stores the number of drive pulses of the pulse motor 14; a control unit 53 (for example, a microcomputer ); and the second storage unit 5Il.

has. The control unit 53 outputs, via a pass line 55, a pulse motor 10 for rotating eyeglass lenses, a photo ink club 12 that outputs a rotation reference signal for eyeglass lenses, a pulse motor 14 for driving a head frame, and a horizontal reference signal. A photo ink printer 19 that moves the head frame up and down, a DC-t-tar 31 that moves the head frame up and down, and a head frame 4.
Photo interrupter 4 that detects the reference position of vertical movement of
b. Encoder that detects the amount of vertical movement of the glasses lens =
32, a grindstone rotation motor 56, a photointerrupter 222 for a sliding detector, a photointerrupter 224 for a mold holder vertical height detector, and a photointerrupter 252 for measuring the thickness of an eyeglass lens.

Next, a flowchart (illustrated in FIG. 6) and other explanatory diagrams (FIGS. 7 to 12) defining the above-mentioned predetermined program
The operation of the device will be explained with reference to.

When the power switch (not shown) is turned on, the DC motor 31
rotates, the wire 26 is pulled to the left in FIG. 2, and as a result, the head frame 4 is lifted upward to a predetermined position. In this state, the distorted mold 9 and the unprocessed eyeglass lens 5 are chucked.

The mode designated by the selection switch 51a of the keyboard section 51 and the ratio designated by the ratio designation switch 51c are input (step 60 in FIG. 6). When the measurement start switch 51b is turned on, the mode and ratio are set by the control section 53.
At the same time, a drive bus is input from the control unit 53 to the pulse motor 14 for moving the head frame, and machining is started (step 61).

When the pulse motor 14 rotates and the protruding piece 18 blocks light from the photointerrupter 19, the photointerrupter 19 generates a horizontal reference signal. When the control unit 53 receives the horizontal reference signal, it stops supplying drive pulses to the pulse motor 14 for moving the head frame, and then starts assembly from the horizontal reference position stored in the first part 52. A number of pulses corresponding to yH2 up to the structural grindstone 20 are inputted to the pulse motor 14 for moving the head frame. Therefore, the horizontal position corresponding to the unprocessed eyeglass lens 5-hulling whetstone 20 will be determined. When the control unit 53id finishes inputting a predetermined number of pulses to the pulse motor 14 for moving the head frame, the motor 5 for rotating the assembled grindstone 20 is turned off.
6 to rotate this motor 56. Next, the DC motor 31 is rotated, the moving part 29 is advanced to the right in FIG. When placed on the rough polishing whetstone 20 with a predetermined pressing force, the eyeglass lens 5 is polished. The control unit 53 also sends a signal to the eyeglass lens rotating pulse motor 10. Therefore, the unprocessed eyeglass lens 5 is ground by the assembled grindstone 20 while rotating slowly. The end face of the unprocessed spectacle lens 5 is ground so that it has almost the same shape as the distorted mold 9 that has been attached in advance. The degree of this is adjusted by raising and lowering the knife-shaped receiver 22 using a pulse motor 24 for raising and lowering the regular shape. Near the end of hulling, the distorted mold 9 comes into contact with the knife-shaped receiver 22, which rotates the knife-shaped receiver 22, and the blocking rod 221 interrupts the photo ink collector 222, so that the resulting photo When the end of hulling is detected by the signal from the interrupter 222 (step 62 in FIG. 6), the control section 53 enters a lens radius measurement step (step 63 in FIG. 6), and a rotation reference signal is obtained from the photointerrupter 12. A driving pulse is sent to the eyeglass lens rotating pulse motor 10 until the lens rotates. When the rotation reference signal is obtained from the photointerrupter 12, the control unit 53 enters a step of reading the rotation angle θ and radius γ (step 64 in FIG. 6). When the spectacle lens 5 is rotated, the head frame 4 moves up and down in accordance with the change in the radius γ of the spectacle lens 5. Therefore, the control section 53
causes the second storage circuit 54 to store a value corresponding to the radius γ of the eyeglass lens 5 obtained from the encoder 32 in correspondence with the number of drive pulses sent to the eyeglass lens rotation pulse motor 10. If the spectacle lens 5 is rotated by one degree with one pulse, the radius γ for each degree is stored in correspondence with the rotation angle. Glasses lens 5 is 36
When the rotation reference signal is obtained again from the photointerrupter 12 after rotating 0 degrees, 360 pieces of data are stored in the second storage circuit 5.
4, and the step of reading the angle θ and radius γ (step 64 in FIG. 6) is completed. The control unit 53 enters an extreme value detection step (step 65 in FIG. 6). The control unit 53 sequentially reads out the values of the radius γ from the second storage circuit 54 and compares the previous and subsequent values to find the extreme value. That is, as shown in Fig. 7, if the spectacle lens 5 after roughening is considered as a circle for simplicity, the positions a, b, c, and d where the minor axis and major axis intersect with the outer circumference will be the final price. . That is, the second memory circuit 54 actually contains 0 as described above.
A deceleration of 360 degrees is obtained every 1 degree over ~360 degrees, but for the sake of simplicity, we assume that data is obtained continuously, and this is shown visually in Figure 8. It becomes like this. In the 8th M, the horizontal axis is the rotation angle of the eyeglass lens 5 from the rotation reference position, and the vertical axis is the radius γ of the eyeglass lens 5. As is clear from Fig. 8, the radius γ at point a when the rotation angle is zero and the 0 point when the rotation angle π is the maximum value, and the radius γ at the point d when the rotation angle is -π is the maximum value r.
Take b, rd. The positions of the extreme values, ie, points a to d, are stored in the second storage circuit 54.

As is clear from Fig. 7, the extreme values from point a to point d are
The point to be machined at the vertex of , the radius at that point is ra to rd
indicates the true radius of the eyeglass lens 5.

When the extreme value detection step is completed, the control section 53 enters step 66 in FIG. 6 to determine whether or not there is an extreme value. If the spectacle lens 5 is circular, there is no extreme value, so the rotation reference position is determined as the extreme value via step 67 in FIG. Once the extreme values are determined for all shapes in this manner, the step of measuring the edge thickness of the spectacle lens 5 at the extreme 1μ is entered (step 68 in FIG. 6).

That is, the control unit 53 applies a driving pulse to the pulse motor 14, and the eyeglass lens 5 is connected to the contact 25 of the detector 25.
The head frame 4 is moved in the horizontal direction to a position where it enters zero. Since the position of the contact 250 is at a constant distance from the horizontal reference position Hs, the control unit 53 determines the position of the contact from the distance from the horizontal reference position S stored in the first storage circuit 52 to the hulling grindstone 20. The head frame 4 is moved by a distance obtained by subtracting the distance up to 250. Thereafter, the control unit 53 sends a rotation signal to the pulse motor 24 to lower the head frame 4 and move the eyeglass lens 5 to the contact 25.
Insert within 0. The horizontal position of the lens at this time is set in advance and is called the edge thickness measurement reference position. after that,
A signal is sent to the pulse motor 10 for rotating the eyeglass lens so that the extreme value is within the contact 250. In this example, since the rotation direction reference position corresponds to the extreme point a, the pulse motor 1O does not rotate. ,? i. The first memory circuit 52 is configured to store the position from the hulling grindstone 20 to the detection unit 25 instead of storing the distance from the horizontal reference position S to the contact 250. Of course, it is okay to do so.

FIG. 9 shows a state in which the lens is at the edge thickness measurement reference position. When the lens is moved to the left by inputting a driving pulse to the pulse motor 14, the contactor 250 rotates and a signal is output from the photointerrupter 252. . The amount of movement t from the edge thickness measurement reference position at that time.

It is read by the number of pulses (the control unit 53 counts up and down the drive pulses and constantly checks the number of drive pulses corresponding to the current position of the spectacle lens 5). Similarly, it moves to the right and reads the amount of movement t2 from the edge thickness measurement reference position in terms of the number of pulses. As a result, the control unit 53 calculates H-(t, +1
Perform step 2) and find the lens edge thickness aD at point a. The control unit 53 sends a signal to the pulse motor 10, and the other extreme points 2, 0, and d are put into the contact 250, and the edge thicknesses bD and cD of the lens are sequentially determined at the points 1, 0, and d. ,
Add dD.

Note that the distance between the left end surface 25a of the contactor 250 and the horizontal reference position S is stored in advance in the memory circuit 52, and if this is M, the positions of both end surfaces of point a are M+t, ,
Each is calculated as M+H-12. This value is a L
+ r aL 2, the other points are bL, .

They are expressed as bL, . . . , dL, aL2, and these data are stored in the storage circuit 54.

Using FIG. 10 to visually explain the data obtained in this way, the horizontal axis represents the distance from the horizontal reference position, the vertical axis represents the rotation angle θ of the eyeglass lens 5, and each Horizontal reference position S for point a, point b, point 0, and point d
Distance from aL, .

bL, , cL, , dL, , and aL, ' + aD, b, which takes into account the thickness of the eyeglass lens at each point.
L, 10bD, cL, +cD, dL, +
dD, a graph showing the edge of the eyeglass lens 5 can be obtained by connecting points corresponding to point a, point b, point 0, and point d. The shaded area in Figure 1θ is the edge thickness of the eyeglass lens (points a and b).

Points other than 0 and d are approximate), and the area within this shaded area is where bevel curves can be added.

Next, the mode stored in the second storage circuit 54 is read (step 69), and if a surface curve is specified as a reference, it is determined whether a ratio is specified (step 70). If the ratio is specified, the edge thicknesses at points a, b, 0, and d are divided by the specified ratio (for example, 6:4) based on the surface, and the positions Qa, Qb, Qc,
Calculate Qd (step 71). If the ratio is not specified, positions Qa, Qb, Qc, Qd are placed at a predetermined constant position (for example, 1st position) from the surface.
(step 72), and in the case of processing in step 72, the position Qa* qb+ Qc is determined when the edge thickness is thin.
, Qd may come off the edge, so the positions Qa, Qb, Qc, and Qd are located between the edge thicknesses (L, -L2
) (step 73). If the position is not within the edge thickness, the position that is outside the edge thickness is within the edge thickness (
For example, the correction is made so that the image falls within the center (step 74
).

On the other hand, if the curve on the back surface is specified in step 69, it is determined whether a ratio is specified (step 75).

If the ratio is specified, point a, point b,
The thickness at the 0 point and d point; the specified ratio of thickness (for example, 4:6)
The place divided by fHQa.

Calculate Qb, Qc, and Qd (step 76). If the ratio is not specified, the position Qa IQb, Qc will be placed at a predetermined fixed position (for example, 2) from the back side.
, Qd is determined (step 77). In the case of step 77, if the edge thickness is thin, the i! Qa, Qb.

Since QC+Qd may deviate from the edge, it is examined whether the positions fff, Qa, Qb, Qc, and Qd are between the edge thicknesses (L, -L2) (step 73).
). If it is not within the edge thickness, correction is made so that the position that is outside the edge thickness falls within the edge thickness (step 74).

From the four points Qa - Qd between the lens edge thicknesses thus accumulated, the slope of the approximate straight line between two adjacent points is determined.

For example, the slope of the approximate straight line between point Qa and point Qb is b−r
a is determined as shown in FIG. 11 (tan α-9 (b-92). Note that P in FIG. 11 is the rotation axis of the lens.

In this way, the i-th point is determined by the slope determined at the point Qa-Qd.

The polygonal line car 1100 shown in the figure is complete. That is, the polygonal line curve 1100 (FIG. 10) created in this way corresponds to the bevel curve. As shown in Figure 10, one point Qa, Q
If b, Qc, and Qd are within the shaded area, the bevel curve 100 is within the lens edge thickness (L).

-L2], so in that case, the step of adjusting the inclination between adjacent points Qa to Qd (step 78 in FIG. 6) is performed.

In the case of steps 71 and 76, points Qa to Qd
However, step 72. In step 77, the point Qa - Qd may deviate from the lens edge thickness interval (L, -L, . . . ) depending on the thickness of the lens 6 and the value of the constant position. Therefore, in step 73, all Q, that is, the point Qa −
Judgment KI whether Qd is between the edge thickness (L, -L2),
If it is between the edge thickness (L, -L2), proceed to step 78, but
If not, after correcting the point Q which is not between the edge thicknesses (L, -TJ2) so that it falls within the edge thickness (step 74), step 78
Proceed to tr.

After confirming that the bevel curve is on the lens edge thickness in this way, the control unit 53 first sends a pulse to the pulse motor 24 to raise the tooth-shaped receiver 22 so as to remove it from the contact 250, and then 5. The position where the bevel curve is attached is exactly above the ■-shaped grindstone 21. Pulse motor 1
4 to input a pulse. In the case as explained in FIG.
Apply a pulse to 4.

The control unit 53 rotates the rotary motor 56 of the ■-shaped grindstone 21, sends a grindstone to the pulse motor 24 again, lowers the knife-shaped support 22, that is, lowers the head frame, and forms a bevel on the eyeglass lens 5. At the same time, in order to form a bevel curve, pulses are input to the noggles motor 14 while synchronizing with the pulse motor 10, and the previously drawn bevel curve (see Fig. 1θ) is applied to the outer peripheral surface of the eyeglass lens 5. The image is formed (step 79).

As a result, bevel curves are uniformly formed on the spectacle lens 5 at positions along the front or back surface and at positions at a certain ratio of the edge thickness of the spectacle lens (step 80
).

Therefore, when a bevel curve is formed from the surface of a spectacle lens, (1) the aesthetic appearance after fitting into a frame is improved compared to a lens that is free-processed. (2) You can easily imagine the bevel carp that is processed into eyeglass lenses. In addition, since the bevel curve can be formed from the front or back surface of the eyeglass lens, even in the case of special lenses such as astigmatic lenses, multifocal lenses, and lenticular lenses, the bevel curve can be processed along the correct spherical surface of the eyeglass lens. Therefore, the bevel curve is a curve whose center of curvature is on the optical axis of the eyeglass lens, and the wearer's long-distance line of sight coincides with the optical axis of the eyeglass lens.

In addition, when a bevel curve is formed at a position with a certain ratio of the edge thickness of the eyeglass lens, (1) the bevel curve processed into the eyeglass lens can be easily imagined.7. ．． (2) Even when the frame is framed in a thick frame such as a plastic frame, the bevel curve can be formed at an aesthetically optimal position taking into account the thickness of the frame.

Note that although the above explanation has been given using an example of forming a bevel, it can be similarly applied to a τ14 curve.

Furthermore, in order to reduce the edge thickness of the eyeglass lens 5, the detection section 25 having a concave contact 250 as shown in FIG. 3 was used in the above description, but a convex contact 250 as shown in FIG. The edge thickness of the spectacle lens 5 can also be increased by using the contactor 250'. In this case, in order to bring the spectacle lens 5 into contact with both sides of the convex part of the contactor 250', the width of the convex part is required as data, and the movement of carrying the spectacle lens 5 over the convex part to the opposite side is necessary. It becomes necessary.

Furthermore, a microphone is provided on the head frame 4 in close proximity to the eyeglass lens 5, and the eyeglass lens 5, which has been hulled and has reached an extreme value, is ground with a coarse grindstone 20 to generate a sound generated by slightly grinding both end faces. is detected by a microphone, a signal similar to the signal from the photointerrupter 252 of the detection section 25 can be obtained, and the position of the edge of the eyeglass lens 5 can be measured.

Similarly, it is also possible to use a vibration sensor or the like instead of a microphone.

Furthermore, in the above embodiment, the mode selection switch 51a
Although a ratio specifying switch 51c is provided, a single mode dedicated machine is also sufficient. That is, for example, a processing machine in which a bevel curve is always formed at a predetermined position from the surface (in Fig. 6, steps 70, 71, 75, 76, and 77 are omitted and the process goes from step 69 to step 72), A processing machine that always forms a bevel curve at a predetermined position from the back side (steps 70, 71, 72 in Fig. 6)
Omit ゜75.76, Step 77 from Pro 9
Let's go to. ), - The processing machine may be such that the bevel curve is always formed at a position having a predetermined ratio of edge thickness (for example, at the center). In this case, steps 69-7 in FIG.
7, between step 68 and step 78,
Front side or back side (either one is determined in advance)
What is necessary is to insert a step of setting Qa - Qd at a position of a predetermined ratio from .

Further, the ratio may be selected from among several predetermined odes, or may be set arbitrarily.

(Effects of the Invention) As described above, according to the present invention, it is possible to automatically attach an optimal gen curve to any lens by measuring its edge thickness. Moreover, it not only allows for easy and error-free processing of eyeglass lenses, but also has the advantage of not having to be attached to a processing machine, and can also be expected to save labor in the entire processing process.

Furthermore, in the first invention in which the front surface curve or back surface curve of the eyeglass lens is made to follow, the curvature center of the bevel curve or groove curve is superior to that of free pressurization regardless of the type or shape of the lens. Since the processed lens can be aligned with the optical axis, it is possible to incorporate the processed lens into the frame optically and medically correctly.In addition, a bevel curve or a groove curve can be placed at the position where the edge thickness of the eyeglass lens is divided at a certain ratio. In the second invention, in which the center of the bevel curve is located, it is preferable to mainly search for a spherical lens, but it is aesthetically superior to free machining, and the center of curvature of the bevel curve does not deviate significantly. Also, since the edge thickness is divided at a fixed ratio, the bevel curve or groove curve will always be between the edge thicknesses, and there is no need to verify whether or not it is between the edge thicknesses, making the configuration easier. It has the advantage of being

[Brief explanation of drawings]

Figures 1 to 5 show detailed examples of the present invention, with Figure 1 being a perspective view, Figure 2 being a rear view, Figure 3 being a detailed view of the detection section, and Figure 4 being a cylindrical receiver. -J detailed diagram, FIG. 5 shows a block diagram of the electrical control device. Figure 6 is a flowchart, Figure 7 is an explanatory diagram for determining the radius assuming that the eyeglass lens after hulling is in the tank, and Figure 8 is the radius and rotation angle obtained from the eyeglass lens in Figure 7. Graphs showing the relationship. Figure 9 shows the state where the lens is at the edge thickness measurement reference position iff, Figure 10 shows the edge thickness distribution diagram of the lens, and Figure 11 shows the slope of the approximate straight line between two adjacent points of the lens. Figure 12 shows another embodiment of the contact. [Explanation of symbols of main parts] l...Body frame 4...Head frame 5...Glasses lens 6...Lens holding shaft 7...Lens holder is shaft 13/Continuous member 14... Pulse motor 15...Clutch 16...Pulley 17...Timing belt 10...-Pulse motor 10a...Gear train 10b...Belt 20.21...Whetstone 25...Lens position Detection device 32...Any/coder 32a11 pulley 11...Reference plate 12...Photointerrupter 50...Electric control device 51a...Selection switch 51c...Ratio designation switch Applicant Japan Takao Watanabe, Agent of Kogaku Kogyo Co., Ltd.

Claims (2)

[Claims] (1) A head frame having a chucking mechanism capable of holding and rotating a spectacle lens and configured to be movable in both a horizontal direction and a radial direction of the spectacle lens, a horizontal drive device for horizontally moving the head frame, and the head A rotary drive device installed in the frame and configured to rotate a lens rotation shaft equipped with a chucking mechanism, a grindstone installed in the main body frame, a lens position detection device provided close to the grindstone, and a position of the head frame. a head frame position detection device that detects the rotation of the lens rotation axis, and each detection signal from the lens position detection device, the head frame position detection device, the rotational position detection device, and the selection means is inputted, The position of the bevel or groove at the periphery of the eyeglass lens is calculated so that the bevel or groove curve follows whichever of the front surface curve or back surface curve of the lens is selected by the selection means, and the position of the bevel or groove is synchronized with the signal from the rotational position detection device. A lens periphery processing machine, comprising: control means for controlling the horizontal drive device based on the calculation result. (2) a head frame having a chucking mechanism capable of holding and rotating an eyeglass lens and configured to be movable in both the horizontal direction and the radial direction of the eyeglass lens; a horizontal drive device for horizontally moving the head frame; and the head frame. A rotary drive device that rotates a lens rotation shaft that is installed on the frame and has a chucking mechanism, a grindstone that is installed on the main body frame, a lens position detection device that is installed near the grindstone, and a lens position detection device that detects the position of the head frame. A head frame position detection device to detect, a rotational position detection device to detect the rotational position of the lens rotation axis, and each detection signal from the lens position detection device, the head frame position detection device, and the rotational position detection device is input. Then, the position of the bevel or groove on the periphery of the eyeglass lens is calculated so that the center of the bevel or groove curve is located at a position where the edge thickness of the eyeglass lens is divided at a constant ratio, and the position of the bevel or groove is synchronized with the signal from the rotational position detection device. A lens periphery processing machine, comprising: control means for controlling the horizontal drive device based on the calculation result.