JPH02212060A - Work machine for peripheral edge of lens - Google Patents

Abstract

PURPOSE:To enable profiling by a ball die and a ball die less working by forming a structure of working the peripheral edge of a spectacle lens by vertically moving the ball die receiver used for the profiling by the ball die based on the relation of the radius and angle of the ball die corresponding to the rim shape of the spectacle frame. CONSTITUTION:A bed frame 4 is fitted freely rotatably to a support shaft 3, a recessed place for chucking a spectacle lens 5 is formed on the frame 4, a lens pressing shaft 6 and lens receiving shaft 7 are penetrated from the both sides of the frame 4 through this recessed place and to one end of the shaft 7 a ball die 9 modeled after the rim shape of the frame is fitted exchangeably. On the main body frame 1 a rough sliding grindstone 20 and V type grindstone 21 for V working are set up so that the respective rotary shafts become parallel to the support shaft 3. For receiving the ball die 9 a ball die receiver 22 having the curved face of the same curvature as the grindstone 21 is provided at the frame 1 side. A gear 23 is rotated by a pulse motor 24 for moving the ball die vertically and the ball die receiver 22 is made so as to be movable vertically in an arrow mark D.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lens periphery processing machine that can automatically add a bevel to the periphery of a spectacle lens.

In order to fit into the rim of an eyeglass frame, the periphery of the eyeglass lens is usually processed into a V-shape called a bevel. Furthermore, some eyeglass frames require a grooved edge instead of a bevel, and the same applies to cases where grooved curves are ground into eyeglass lenses.

For this purpose, a conventional lens periphery machining machine using copy processing has a head frame with a lens rotation axis equipped with a chucking device that holds and rotates the eyeglass lens, and a head frame that is installed on the main body frame and has a rotating shaft for grinding the eyeglass lens. A grinding wheel, a lens mounting device for attaching Type 1 to the lens rotation shaft, and a drive device that is installed on the main body frame and has a lens holder that is in contact with Type 1, and that moves the lens holder up and down. A lens periphery processing machine is known which has the following and grinds the eyeglass lens according to the shape of the first type. Numerically control processing machines based on design data. It is natural to consider the use of so-called NC machining in view of the flow of technology.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide a ball-sliding machine that can perform copy processing using the first die and processing without the first die using numerical control with a simple configuration.

The present invention has a configuration in which the periphery of the eyeglass lens is processed by moving the lens shape holder used for copying processing using the 1st type up and down based on the relationship between the radius and angle of the 1st type that corresponds to the rim shape of the eyeglass frame. Accordingly, the lens shape holder is copied and processed
It can be used for moldless processing, which not only simplifies the configuration, but also allows the head frame to be attached to the support shaft (
If the head frame rotates around a horizontal axis, the height position of the head frame can be controlled at the most efficient position.

The present invention will be described below based on an embodiment shown in one drawing.

1 to 5 show embodiments of the present invention.

A support shaft 3 is slidably supported in a horizontal direction (in the axial 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. A lens holding shaft 6 and a lens holder shaft 7 are passed through the recess from both sides of the head frame 4, and one end of the lens holding shaft 6 is inserted into the recess. A driving device 8 such as a motor for driving the shaft 6 in the axial direction is connected to the shaft 6, and a rubber or the like for directly pressing the spectacle lens 5 is provided at the other end, although not shown in the figure. on the other hand.

The lens holder has a 1-type 9 shaped like the rim of an eyeglass frame attached to one end of the shaft 7, and this 1-type 9 is replaceable, and the lens holder directly connects the eyeglass lens 5 to the other end of the shaft 7. A rubber or the like (not shown) is provided for receiving the support.

The lens holding shaft 6 and the lens holder shaft 7 are gear train 10a,
The lens holder is synchronously rotated by a lens rotation pulse motor 1O via a transmission device such as a belt 10b (arrow B), and a reference plate 11 having a notch is fixed to the shaft 7 to detect the initial position of lens rotation. A photointerrupter 12 is provided on the head frame 4 so as to sandwich a reference plate 11 therebetween.

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 to include the support shaft 3 on the rear side of the head frame 4, so that the support shaft 3 is moved along the support shaft 3 together with the head frame 4 in the horizontal direction (
A connecting member 13 movable in the direction of arrow C) is provided, and the other end of the connecting member 13 is connected to a pulse motor 1 for moving the head frame.
4 and an electromagnetic clutch 15, it is connected 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 photointerrupter 19 provided on the main body frame 1 from light.

A hulling grindstone 20 and a V-shaped grindstone 21 for bevel processing are installed on the main body frame 1 so that their rotational axes are parallel to the support shaft 3. The rotation of the grindstones 20 and 21 is performed by a motor (not shown). Ball 5! In order to receive λ9, a lens-shaped support 22 having a curved surface with the same curvature as the grindstone 21 is provided on the l side of the main body frame. Although the lens-shaped receiver 22 is not shown in FIG. 1, a rack 223 is attached to the frame body 220 as shown in FIG.
3 is engaged. The gear 23 is rotated by a type 1 vertical pulse motor 24, so that the lens holder 22 is configured to move vertically (arrow D). The vertical height reference position of the lens holder 22 is set by placing the photo interrupter 224 attached to the fixed guide 225 side on the frame body 220.
Detection is performed by blocking light with a light blocking plate 226 attached to the side. In addition, the eyeglass lens 5 is located close to the grindstone 20.
A detection unit 25 is installed to automatically measure the edge thickness of the frame. As shown in FIG.
By providing a light shielding member 253 for shielding 52 from light and a spring 254, and swinging the spectacle lens 5 which has finished hulling within the U-shaped portion of the contactor 250.

This turns the photointerrupter 252 on and off.

Further, in order to rotate the head frame 4 around the support shaft 3, 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 moving member 29 that moves horizontally by the rotation of the screw 28. The screw 28 is connected to a DC motor 31 via a gear 30. Since the head frame 4 is given a rotational force in the clockwise rotation direction in FIG. 1 due to its own weight, the DC motor 31,
Gear 30. Screw 28, moving member 29. The wire 26 provides a rotational force to rotate the head frame 4 to the left. In order to detect the rotational position of the head frame 4, 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 A string 32b is hung between them, and as a result, the encoder 32 rotates in accordance with the rotation of the field frame 4. Further, the initial position of the encoder 32 is the photo interrupter 4 attached to the head frame 4.
b is detected by being shielded from light by a light shielding plate 13c attached to the connecting member 13.

In addition, in this embodiment, a pulse probe 10.14 is provided in the drive unit.
．． 24, and photo interrupter 4b, 1 for position detection.
2,19,222°224.252 is used,
Instead of the photointerrupters 4b, 12, 19, 222, 224, 252, other optical sensors or sensors such as limit switches can be used. Furthermore, it is also possible to achieve the same function by using DC motors in place of the pulse motors 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.

Electric control system a! 50 is a curve value (represented by K as described later), which is between 51a and the radius R of the spherical surface when the glasses frame is considered as a part of the spherical surface, and the measurement start switch 51.
A keyboard portion 51.b having a keyboard portion 51.b. The hulling grindstone 20, the V-shaped grindstone 21, and the contactor 2 of the detection unit 25 are set based on a predetermined program and horizontal reference position based on the flowchart described later.
50 as the drive pass number of the pulse motor 14: has an arithmetic function and controls each part according to the program stored in the first storage section 52. It has a control section 53; and a second storage section 54. The control unit 53 outputs the eyeglass lens rotation pulse motor 1O, the photointerrupter 12 that outputs the eyeglass lens rotation reference signal, the head frame drive pulse motor 14, and the horizontal direction reference signal via the pass line 55. A photo interrupter 19, a DC motor 31 that moves the head frame up and down, a photo interrupter 4b that detects the reference position of the up and down movement of the head frame 4, an encoder 32 that detects the amount of downward movement of the eyeglass lens.
, a motor 56 for rotating the grindstone, a photointerrupter 222 of the sliding detector, a photointerrupter 224 of the lower height detector of the holder, and a photointerrupter 252 for measuring the edge thickness of the eyeglass lens. There is.

Next, a flowchart (illustrated in FIG. 6) and other explanatory diagrams (JFIT diagram to 141
The operation of the device will be explained with reference to FIG. 2).

When a power switch (not shown) is turned on, the DC motor 31 rotates and the wire 26 is pulled to the left in the second rA, thereby lifting the head frame 4 upward to a predetermined position. In this state, the first mold 9 and the unprocessed eyeglass lens 5 are chucked. Enter the diameter and curve value into the keyboard section 51 using the manual switch 51a (step 60 in FIG. 6), and turn on the A11l constant start switch 51b (step 61 in FIG. 6). Then, the diameter and curve value are controlled. The driving pulse is stored in the second storage circuit 54 via the section 53, and the drive pulse is input from the control s53 to the pulse motor 14 for moving the head frame. When the pulse motor 14 rotates and shields the protruding piece 18 or the photo ink converter 19 from light, the photo interrupter 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.

Thereafter, a number of pulses corresponding to the distance from the horizontal reference position stored in the first storage section 52 to the hulling grindstone 20 are inputted to the pulse motor 14 for moving the head frame. Therefore, the unprocessed eyeglass lens 5 is placed at a horizontal position corresponding to the hulling grindstone 20. When the control unit 53 finishes inputting a predetermined number of pulses to the pulse motor 14 for moving the head frame, it sends a signal to the motor 56 that rotates the hulling grindstone 20, and outputs a zero-order DC signal to rotate the motor 56. Rotate the motor 31 and move the moving member 2
9 to the right in FIG. 2, rotate the head frame 4 around the support shaft 3, bend it downward from a predetermined position, and place the unprocessed eyeglass lens 5 on the hulling grindstone 20 with a predetermined pressing force. Once placed, the eyeglass lens 5 is removed from the rice grains. The control unit 53 also sends a signal to the eyeglass lens rotation pulse motor 1O.

Therefore, the unprocessed eyeglass lens 5 is hulled by the hulling grindstone 20 while rotating slowly. The unprocessed eyeglass lens 5 is
The end face is ground so that it has almost the same shape as the mold 1 9 installed in advance. The degree of this is adjusted by moving the lens shape receiver 22 up and down using a pulse motor 24 for raising and lowering the lens shape. When the hulling process is nearing the end, the 1st type 9 is replaced by the ball holder 2.
2, the lens-shaped receiver 22 is thereby rotated, and the blocking rod 221 comes into contact with the photo interrupter 2.
22, and detects the end of hulling based on the signal obtained from the photointerrupter 222 (step 62 in FIG. 6), the control unit 53 starts the lens radius measurement step (step 63 in FIG. 6). drive pulses are sent to the eyeglass lens rotation pulse motor 10 until a rotation reference signal is obtained from the photointerrupter 12. 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 (Ram step 64).

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 unit 53 controls the encoder 32 in accordance with the number of drive pulses sent to the eyeglass lens rotating pulse motor 1O.
A value corresponding to the radius γ of the spectacle lens 5 obtained from the above is stored in the second storage circuit 54. If the spectacle lens 5 is caused to rotate by one degree with one pulse, the radius γ of each degree is stored in correspondence with the rotation angle. When the eyeglass lens 5 rotates 360 degrees and the rotation reference signal is obtained again from the photointerrupter 12, the data of 360 ([) is stored in the second storage circuit 54, and the step of reading the angle θ and radius γ (Step 64 in FIG. 6) is completed.The control unit 53 enters the extreme value detection step (Step 65 in FIG. 6).The 0M control 191153 sequentially reads out the values of radius γ from the lR2 storage circuit 54, The extreme value is determined by comparing the values of .In other words, if the spectacle lens 5 after hulling is assumed to be an ellipse for simplicity as shown in FIG. ,b,
c and d are extreme values. That is, in the second storage circuit 54, data is actually obtained for each degree of 360 degrees from 0 to 360 degrees as described above, but for the sake of simplicity, it is assumed that the data is obtained continuously. However, this can be visually shown as shown in FIG. In FIG. 8, the horizontal axis represents the rotation angle of the eyeglass lens 5 from the rotation reference position, and the vertical axis represents the radius γ of the eyeglass lens 5. As is clear from Fig. 8, at point a when the rotation angle is 0 and at point 0 when the rotation angle is π, the radius γ has the minimum value ra, re, and at the point d, the radius γ has the maximum value rb, rd. Take. 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 points a to d are the points where processing is performed at the apex of the hulling grindstone 20, and the radius ra at that point is
When the extreme value detection step in which rd to rd indicates the true radius of the eyeglass lens 5 is completed, the control unit 53 enters step 66 in FIG. 6 to determine whether or not there is an extreme value. If it is a circle, 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 way, the step of measuring the edge thickness of the spectacle lens 5 at the extreme value is entered (step 68 in FIG. 6). That is, the control unit 53 applies a drive pulse to the pulse motor 14 to move the head frame 4 in the horizontal direction to a position where the eyeglass lens 5 enters the contact 250 of the detector 25. Since the position of the contactor 250 is at a constant distance from the horizontal reference position S, the control unit 53 determines the position of the contactor 250 based on the distance from the horizontal reference position S to the hulling grindstone 20 stored in the wSl storage circuit 52. The head frame 4 is moved by a distance obtained by subtracting the distance M to the edge thickness measurement reference position. Thereafter, the control unit 53 sends a rotation signal to the pulse motor 24 to lower the head frame 4 and insert the eyeglass lens 5 into the contact 250. 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 reference position in the rotation direction corresponds to point a of the extreme value, the pulse motor
Note that the first memory circuit 52 stores 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 contactor 250. Of course, it is also possible to do it like this.

FIG. 9 shows a state in which the lens is at the edge thickness measurement reference position, and when a driving pulse is input to the pulse motor 14 to move the lens to the left, the contact 250 rotates and a signal is sent from the photo ink clubter 252. coming out. The movement aikxr from the edge thickness measurement reference position at that time is calculated by the number of pulses (11 control unit 53
is read by counting up and down the driving pulses and constantly checking the number of driving pulses corresponding to the current position of the spectacle lens 5. It moves to the right in the manner of Mr. U, and its movement from the edge thickness measurement reference position is read by the number of pulses.

As a result, the control unit 53 controls the left and right end surfaces 25a of the contactor 250, which are stored in advance.

The calculation H-(1, 1,000 2) is performed from the interval H of 25b to find the edge thickness aD of the lens at point a. The control unit 53 sends a signal to the pulse motor 10, and sequentially inserts the other extreme points, 0 point, and d point into the contactor 250.
The edge thicknesses bD, cD, and dD of the lens at point d are determined.

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', then the positions of both end surfaces of point a are M'
, M'+H-view, respectively. This value is aL
,, aL, and the other points are bLl , bLj , -.
..., dLr, dL*, and these data are stored in the storage circuit 54.

To visually explain the data obtained in this way, M
Using diagram S10, 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 points a and b are respectively represented.

Distance a from horizontal reference position S for point 0 and point d
Ll, b L@, CLs, d Ls, and aL, +aD taking into account the thickness of the eyeglass lens at each point
, bL, +bo, cL+ +cD.

If you take dL and +dD, you get point a, point b, and 0 points.

By connecting the points corresponding to point d, the eyeglass lens 5
A graph with expanded edges of is obtained. The shaded area in FIG. 1θ shows the edge thickness of the eyeglass lens (approximate at points other than points a, b, 0, and d), and within this shaded area, it is possible to provide a bevel curve.

Next, the control unit 53 determines the average value of the radius γ over the entire circumference of the spectacle lens 5 determined previously (step 69 in FIG. 6).
At the same time, the curve value inputted prior to the measurement is read out from the storage circuit 52, and the radius R corresponding to the curve value is determined,
As shown in FIG. 11, on the radius R and the average value of the radius γ "
■ Find the tangent at the intersection Q with ean (step 0 in Figure 6).
By step 71) in the figure and the finishing start step (step 79 in figure 6) described later, the eyeglass lens 5 is rotated and given a bevel curve while following this straight line according to the change in radius. Become. Approximate tracing straight line shown in No. 111 and half tera of eyeglass lens 5, rb
, rc, and rd are the positions where the bevel curves are actually attached on the circumference of the spectacle lens 5. Here, the width ΔQ is the maximum deviation width of the bevel curve, and the bevel curve is formed within this width ΔQ on the circumferential surface of the eyeglass lens 5. Find (ffi6 diagram step 72),
In this case, point Qa is determined as the center of point a as shown in FIG. Based on the point Qa determined in this way, the first
If we write the intersections Qb, Qc, and Qd in Figure 1 in Figure 1θ, we get
A polygonal curve 100 shown in FIG. 1O is obtained (6th
Step 4) in the figure.

This polyline curve 100 corresponds to a bevel curve. W
As shown in Figure 41O, the points Q a * Q b * Q c
If +Qd is within the Is line, bevel curve 10
0 can be attached without coming off on the lens edge thickness, so in that case, the finishing start step (step 79 in Figure 6) is entered. However, if the specified curve is large, the bevel curve is applied at a value other than the minimum value of the edge thickness 10. 100 may deviate depending on the lens edge thickness. In that case, the control unit 53 controls the minimum value among the edge thicknesses, that is, the point Qa in this example.
to the direction of one of the end faces (step 76 in Fig. 6) and select the remaining three points Qb, Qc, and Qd from the approximate tracing curve.
, check whether all points fall within the edge thickness of the eyeglass lens 5 (Step 7 in Figure 6), and if it is confirmed that they do, enter the finishing start step (Step 79 in Figure 6). If not, the specified curve is inappropriate, so a display etc. is performed and the specified curve value is changed (step 78 in FIG. 6).

After confirming that the bevel curve is on the lens edge thickness in this way, the control section 53 first controls the pulse motor 2.
Send a pulse to the pulse motor 14 to raise the lens holder 22 so as to remove it from the contact 250, and input a pulse to the pulse motor 14 so that the position where the bevel curve of the eyeglass lens 5 is placed is exactly above the V-shaped grindstone 21. . In the case as explained in FIG. 1O, the control section 53 applies a pulse to the pulse motor 14 so that the point Qa at point a of the spectacle lens 5 is exactly on the V-shaped grindstone 21.

The control unit 53 rotates the rotary motor 56 of the V-shaped grindstone 21, sends a pulse again to the pulse motor 24, lowers the lens holder 22, that is, lowers the head frame, and forms a bevel on the eyeglass lens 5. In order to form a bevel curve, pulses are input to the pulse motor 14 in synchronization with the pulse motor 10, and the previously determined bevel curve (see Figure 1O) is formed on the outer peripheral surface of the eyeglass lens 5. Result, glasses lens 5
A bevel curve that matches the specified rim curve is formed.

Note that in order to determine the edge thickness of the spectacle lens 5, the detection section 25 having a concave contact 250 as shown in FIG. 3 was used in one or more of the explanations.

The edge thickness of the eyeglass lens 5 can also be determined by using a convex contactor 250' as shown in FIG. 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.

Further, it is necessary to carry the spectacle lens 5 over the convex portion to the opposite side.

Furthermore, a quick lock-on 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 whose extreme value has been determined, is subjected to minute portion grinding on both end surfaces using a huller grinding stone 20, thereby generating noise. 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.

According to the above configuration, by measuring the edge thickness of any lens, it is possible to automatically set the optimum gen curve, so even a person with little experience can
This method not only allows for easy processing of eyeglass lenses in a short period of time and without mistakes, but also has the advantage of not requiring the use of a processing machine all the time, but can also be expected to save labor in the entire processing process.

Furthermore, the above-mentioned device is equipped with a device that automatically measures the rim shape of the glasses frame and converts the relationship between the radius and angle of the type 1 at that time into an electrical signal.

By providing a control device that moves the lens shape holder 22 up and down by a pulse motor 24 in response to the signal, it is possible to manufacture spectacle lenses without requiring one mold. In this case, it goes without saying that it is desirable to make the type 1 into a predetermined shape, for example, a circular shape, which is effective because it allows the eyeglass lens to match the eyeglass frame accurately. It is.

As described above, according to the present invention, the lens shape holder can be formed by copying and processing.
Not only can it be used for moldless machining, simplifying the configuration, but also allows the height position of the head frame to be set at the most efficient position for products that rotate around the head frame or support shaft. Can be controlled.

[Brief explanation of the drawing]

tJ41 is a perspective view of an embodiment of the device according to the invention, the second
The figure is a view of the device shown in FIG. 1 from the rear side. Figure 3 is a configuration diagram of the detection unit, Figure 4 is a detailed diagram of the lens holder,
Figure 5 is an explanatory diagram of the electric control device used with the devices in Figures 1 to 4, Figure 6 is a flowchart defining the program, *'yL4 is when the eyeglass lens after hulling is considered to be an ellipse. Diagram of the eyeglass lens and grindstone, Figure 8 is the 7th
Graph that visually shows the data from Figure 9. Figure 9 is a diagram of the relationship between eyeglass lenses and contacts. Figure 10 is a graph that visually explains the data obtained from Figure 9. Figure 11 is the radius. A tangent on R at the intersection Q with the average value rsean of the radius γ. FIG. 12 shows another embodiment of the contact. (Explanation of symbols of main parts) 3... Support shaft 4... Head frame 5... Glasses lens 9... ...Type 1 14--Pulse motor for head frame movement
20... Hulling whetstone 21... V5 for beveling processing! Whetstone 24...
...Type 1 and lower pulse motor-25...Detection section

Claims (1)

[Scope of Claims] A head frame having a lens rotation axis equipped with a chucking device for holding and rotating an eyeglass lens; a rotating grindstone installed on the main body frame for grinding the eyeglass lens; a lens shape mounting device for attaching the mold; a drive device installed on the main body frame, having a lens shape holder with which the lens shape comes into contact, and moving the lens shape holder up and down; In a lens periphery processing machine that grinds eyeglass lenses according to their shape, a device converts the relationship between the radius and angle of a lens shape corresponding to the rim shape of a eyeglass frame into an electrical signal. A control means is provided for rotating the eyeglass lens and grinding the eyeglass lens into a predetermined similar shape to the eyeglass frame by moving the lens shape receiver up and down, without requiring a lens shape corresponding to the eyeglass frame.
The Tamazuri machine also made it possible to make eyeglass lenses.