JPS63174858A - Lens periphery machining device - Google Patents

Abstract

PURPOSE:To simplify a control mechanism, by a method wherein from a linear movement displacement amount in relation to rotation of a template, a distance between the rotation center point of the template and the central position of curvature of a surface part in relation to the rotation angle position of the template is measured, and based on the measurement data, a lens is cut. CONSTITUTION:A contact surface between a probe 11 and a lens template forms a part of a circumference of the same radius as that of a cutting stone, and a support shaft 13 is coupled to a slide disc 25. The slide disc 25 is normally constantly energized in the direction of a lens template attaching shaft to through the force of a resilient body. When a lens template is rotated with the aid of a motor, the probe 11 is pressed, the slide disc 25 is moved, and its movement position is differed with a rotation angle position. The movement of the slide disc 25 is detected from winding-in resistance of the wire of a potentiometer 40. Thus, during one full turn of the lens template, a pattern rotation angle and a distance between a pattern center and the center of a cutting stone are measured, its measurement data is A/D-converted, and the result produces cutting information of numerical control.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lens periphery processing device that obtains shape information from a lens template having a desired shape and cuts the periphery of an eyeglass lens.

(Prior art) Conventionally, the peripheral edge processing of eyeglass lenses involves molding a flat template with the same shape as the eyeglass frame, and holding this template and the unprocessed eyeglass lens (hereinafter referred to as the lens) coaxially. The periphery of the lens was brought into contact with the periphery of a disc-shaped grindstone to grind it into a shape that approximated the shape of an eyeglass frame (hereinafter referred to as frame).

In recent years, peripheral edge processing machines using a numerical control method have appeared, and when processing the peripheral edge of a lens with this device, it is necessary to measure the shape information of the lens template as data of a digital signal. In Japanese Patent Application Laid-Open No. 60-118460, a template detection contact is brought into contact with the entire circumferential surface of the template, a detection arm supporting the contact is rotated, and the detection arm is moved against the circumferential surface of the template. It has a template measuring means that measures the dynamic radius from the corner position to obtain cutting information. Similarly, in JP-A No. 61-156022, in order to measure the inner diameter of a lens template, a mechanism is used to align the geometric center point of the lens template with the rotation center of the contact, and the rotation angle of the contact is Disclosed is a method for measuring an inner diameter corresponding to a diameter.

(Problems to be Solved by the Invention) However, in both JP-A-60-118460 and JP-A-61-156022, the radius position from the center of the template is determined as template at m information. For this reason, since the gauge head is slid on the circumferential surface of the template, a special means for correcting the rotation center position of the gauge head and the geometrical center position of the template is required. , shape information of the lens template at the initial radius position from the center of the template was determined. In order to bring the measuring head into contact with the template roughly and accurately and obtain accurate template information, a complicated mechanical configuration is required, and the purpose of the present invention is to correct the template data from the measuring mechanism, etc. It is an object of the present invention to provide a template measuring means having a simple and accurate mechanism capable of obtaining grindstone cutting information from lens template measurement information without the need for lens template measurement, and a peripheral edge processing method for an unprocessed lens.

(Another means to solve the problem) In a numerically controlled lens peripheral processing device that obtains lens shape information from a lens template and cuts an unprocessed lens, a lens mold that has a rotation angle detection means and is linked to the rotation means is used. A measuring device that has the same radius of curvature as the cutting wheel used to cut the unprocessed lens on the circumferential surface of the plate, and has a linear movement means with which the surface portion contacts and a detection means that detects the movement, and a measuring device that measures against rotation of the template. An unprocessed lens characterized in that the distance from the center of rotation of the template to the center of curvature of the surface portion is measured with respect to the rotational angular position of the template using a linear motion means, and the lens is cut based on the measured data. An object of the present invention is to provide a peripheral edge processing device.

(Function) Since the lens template is linked to the rotation axis of the drive motor, it can be controlled by controlling the rotation of the motor.

The rotation transmission axis of the motor is 3 to the encoder! ! ! Since the motor is suspended between a moving encoder pulley and a timing belt, the rotation angle of the motor is detected by the encoder.

The contact surface of the measuring element with the lens template forms part of the circumference having the same radius as the cutting wheel, and its support shaft is connected to the slide plate. This slide plate is constantly biased by an elastic body in the direction of the lens template mounting axis, and is slidably placed on a parallel guide shaft. Therefore, the measuring element comes into contact with the peripheral surface of the lens template.

When the lens template is rotated by the motor, the probe is pressed and the slide plate moves, and the moving position differs depending on the rotational angular position of the lens template.

This movement of the slide plate is detected by the winding resistance of the potentiometer wire. Therefore, during one rotation of the lens template, the pattern rotation angle and the center distance between the pattern center and the cutting wheel are measured 51 times, and the 1 measurement data is
It is converted and inputted as cutting information to a peripheral edge processing device controlled by numerical values IT and II.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 to FIG. 7 are diagrams showing an embodiment of the lens peripheral edge processing method according to the present invention.

Fig. 1 is a plan view of the lens template measuring device 1, Fig. 2 is a front view of Fig. 1, Fig. 3 is a right side view of Fig. 1, and Fig. 4 is a left side view of Fig. 1. FIG. 5 is a perspective view showing the internal mechanism with the template attached to the device and the base plate removed from the plan view shown in FIG. 1, and the state shown in FIG. 1 rotated by 180°. FIG. 6 is a diagram showing the principle of lens template measurement, and FIG. 7 is a diagram showing the basic configuration of the lens peripheral edge processing device.

In FIG. 1, a lens template mounting portion 3 and a measuring portion 4 are exposed on the base plate 2.

The mold plate opening 3 has a mold plate holding knob 5 integrated with a mold plate holding screw 5a, a screw hole 6, and a protrusion 8 into which a lens mold plate 7 is inserted (see FIG. 3) at its tip. Plate holder 9
, consisting of a temporary presser shaft 10 that supports the presser stand 9, and a hole in a lens template is inserted into the protrusion 8, and the eyeglass lens template has a mounting hole, which is a through hole, formed in its geometric center. be.

), and then the presser screw 5a of the temporary presser knob 5 is screwed into the screw hole 6 of the presser stand from above, so that the template 7 is clamped. (The aspect thereof is as shown in FIG. 5.) The measuring section 4 has a round plate 11 having the same radius of curvature as the cutting wheel of the lens peripheral processing machine as a measuring element, which is joined to the round mount 12. Although the material of the flat plate 11 is a cemented carbide in this embodiment, it may be made of any material having excellent wear resistance, such as ceramic. In addition, the corner plate 11 and the corner mounting base 12 may be integrated into 4M in their combined state, and are not particularly limited to the above configuration. The measuring part 4 is supported by a vertical mounting shaft 13 that penetrates the base plate 2, and the base plate 2 has a slide groove 2a in the direction toward the template mounting part 3. Be able to move in any direction.

Next, the movement mechanism and detection IN structure of the template mounting section 3 and the measuring section 4 will be explained with reference to FIGS. 3, 4, and 5. In FIG. 3, the presser shaft 10 is screwed to the base plate 2,
It passes through a bearing case 15 in which a bearing 14 is fitted, and its lower end is fitted into a template drive member 19 consisting of a flange 16, a timing belt 17, and an encoder pulley 18, and rotates at the rotation angle shown in FIG. This is the rotation axis of the encoder 20, which has the function of detecting.

As shown in FIG. 5, the timing belt is fixed on the base, and the rotary motion of the shaft-side pulley 22 and the encoder pulley of the drive motor 21 disposed at the bottom of the probe is transmitted to the encoder pulley 18. There is.

Therefore, the drive of the motor 21 is transmitted to the lens mold plate 7, and its rotation is detected by the encoder 20. A template origin position detection sensor 165 (FIG. 2) is provided below the drive motor. Its configuration uses a known detection mechanism, and the mechanism (not shown below) has an inverted shielding plate attached to the rotational drive shaft of the motor 21, and the shielding plate rotates in conjunction with the rotation of the remoter. .

A photomicrosensor screwed to the microsensor mounting plate is arranged on the trajectory of the rotational circumference of this shielding plate, and a photomicrosensor is installed on the board between the photomicrosensor and the center of the rotation axis of the motor. A stopper supporting column is provided, and a rod-shaped stopper is provided facing downward on a rotary plate attached to the pulley shaft of this motor. Therefore, when the motor rotates, the stopper prevents its rotation, and its rotational position is detected by a microswitch. Therefore, when the motor completes one rotation, it is detected by the photomicrosensor and the motor stops.

Next, the movement mechanism of the measuring section 4 will be explained.

In FIG. 3, the lower end of the vertical mounting shaft 13 passing through the base plate 2 is placed on a slide plate 25 placed on two guide shafts 23 and 24.
Then, secure it with screws 25 and a from the bottom side of the slide plate. The guide shafts 23 and 24 each have two rectangular guide bearing stands 2 whose end surfaces at both ends are fixed to the base plate 2.
6.27, the joint part is fixed with screws from the outside as shown in Fig. 2, and the two wooden guide shafts 23
．． 24 are mounted in parallel.

The outer ring of the left side bearing 28, which includes a bearing shaft 28a screwed to the slide plate 25, is in contact with the outer side of the left side guide shaft 23, and the inner side of the right side guide shaft 24 is in contact with the outer ring of the left side bearing 28, which includes a bearing shaft 28a screwed to the slide plate 25. The outer rings of the two right side bearings 29 enclosing the stopped bearing shaft 29a are in contact with each other, that is, the slide plate 25 is in contact with the guide shaft 23.
．． 24 while being supported through the outer ring of the bearing.

Further, a magnet plate 28b is fixed to the left guide bearing stand 27 between the guide shafts 23 and 24, and the slide plate 25
has a certain biasing force on the short side of the left guide bearing pedestal in the direction of the chamber bearing pedestal.

As shown in FIGS. 5 and 3, the slide plate 25 has a notch 33 on one side parallel to the guide shaft 24 for accommodating a part of the spring 32. 33
A first through-hole 35 is formed in the upper part of the spring hook, one end of which is implanted on the base body on the side of the measuring section, into which the other end of the long spring 32, which is engaged with the column 34, is engaged. Further, a second through hole 36 is formed in the side surface of the notch, and in this through hole 36, one end of the spring hook is locked to the column 34, and the spring hook 37 is connected in the middle with a second through hole 36. The other end of the wire 38 is locked.・Therefore, the sliding plate is always spring-loaded in the direction of the support column 34, that is, toward the side of the measuring section, and the wire 38, which includes the long spring 32 and the similar spring 37, is spring-loaded in the direction that is,
The lens template is biased in the axial direction. Further, the spring hook 38 has its mounting position n on a line passing through the axis of the lens template holding shaft 10 and perpendicular to the guide shafts 23 and 24.
In other words, in the guide axis direction, the lens template holding shaft 10 and the base point position are the same.

Next, the configuration of the detection section of the measurement section will be explained with reference to FIGS. 2, 3, 4, and 5.

As shown in the right side view of Fig. 3 and the left side view of Fig. 4, the base body has a screwed potentiometer mounted &39
A potentiometer 40 is fixed via.

As shown in the left side view of FIG.
It has an encoder pulley 41 at the tip of the output shaft, and a wire 42 is stretched around the encoder pulley 41. The other end of the wire 42 is wound around the outer ring groove of the outer ring grooved guide bearing 43 fixed to the side wall surface of the left guide bearing stand 26, and is formed at the tip of the side of the slide plate facing the right guide bearing stand 27. After being passed through the through hole 44, it is fixed with a wire caulking fitting 45 in the vicinity of the through hole 44 (see Fig. 5).
The frame plate attached to the slide plate, which is always set at the reference position under the bias of a spring, is always in contact with the lens template in a state of pressing the template. However, when the templates are rotated, the pressing forces are different because the templates are not of the same shape. Changes in the pressing force against the probe cause displacement of the slide plate. The displacement of the slide plate is transmitted to the rotary shaft of the encoder via the outer ring grooved guide bearing of the reguide bearing stand 2 by a wire. In other words, Y17-
The entrainment distance is measured.

In other words, the displacement of the probe moved by the lens template is measured based on the rotation angle of the lens template. The rotation angle is detected as an electrical signal using an encoder and a potentiometer.

The electrical signal is converted into a digital signal through a conventionally known A/D converter and sent to the control circuit of the CPU.

In FIG. 6, the cutting reference line X ref is a horizontal line that passes through the geometric center of the lens when the eyeglass lens is attached to the eyeglass frame. It is assumed that the angular position of the cutting point of the lens is determined using this reference line Xrer as a reference. Line ACC is a straight line passing through the geometrical center XCC and the center of rotation of the grindstone having radius R. The lens to be cut requires an angle θ formed with the straight line ACC of 5t￥@Xref when the above cutting point contacts the grinding wheel peripheral surface, and a distance 11H between the rotation center of the grinding wheel and the above geometric center at that angle. This is the cutting information. The present invention is a device for measuring this.

That is, in the present invention, an arbitrary position on the circumferential surface of the lens template 105 is brought into contact with the circumferential surface of the flat plate 11, and the angle θ of the reference line X ref with the straight line Acc at that position and the center-to-center distance 1 '' is first measured, and the variation with respect to the initial measurement distance 1-1 is measured with respect to the angle θ, thereby measuring the cutting information.

FIG. 7 is a diagram showing the overall configuration of a numerically controlled lens periphery processing apparatus 100 using the lens periphery processing method of the present invention.

The whetstone processing section 102 includes a rough whetstone 103a and a bevel stone 10.
3b, a diamond wheel 103 consisting of a flat whetstone 103c
A rotating shaft (spindle shaft) 10 having a pulley 104
The pulleys 104a and 1 are coaxially arranged on the pulleys 104a and 1.
04b is connected to a diamond wheel drive motor 106 (hereinafter referred to as a grindstone motor) via a belt 107, and the rotation of the grindstone motor 106 rotates the grindstone 103, and the rotation of the grindstone motor 106 is driven by a motor drive circuit 108a. under the control of a motor and clutch drive 108 having a

Also, the output side pulley of the motor 106 is 1098°109
As shown in this embodiment, a configuration such as an edge thickness measurement positioning sensor 11, an origin positioning sensor 111, a lens edge thickness measurement motor 112, etc. can be added to b.

The carriage 113 is provided with a holding shaft 117 consisting of a lens mounting shaft 115 for holding the unprocessed lens 114 and a lens holding shaft 116 on its front surface.
13a includes a lens drive motor 118 that rotates the holding shaft 117, an output shaft 119, gears 120a, 120b, pulleys 121a to 121d, a bolt 122, and a belt 12.
3a.

a holding shaft rotation means 124 consisting of 123b and a lens chuck motor 125 for driving the lens holding operation;
It has a lens holding means 130 consisting of an output shaft 126, a pulley 127, a belt 128, and a jacking member 129, and a lens rotation angle detecting means 131.

This main 1-ridge 113 is moved along the X-axis and Y-axis by an X-axis moving means 139 and a Y-axis moving means 148, respectively.
Sent axially. The X-axis moving means includes an X-drive pulse motor 133 under the control of an X-axis pulse motor drive unit @132, an electromagnetic clutch 134, and its driving force transmission means (output shaft 136, pulleys 137a, 137c,
Belt 138a.

138b), and the X-axis diameter initial means 13
5a in the X-axis direction by the carriage 113,
However, the Y-axis moving means 148 is a Y@ drive servo motor 141 under the control of the servo motor drive device 140.
and pulleys 143a and 1 provided on the output shaft 142.
43b and a belt 144, and a movable plate 145
, the carriage 113 is sent in the Y-axis direction via the movement member 146 and the transmission rod 147. The X-axis and Y-axis moving means 139 and 148 respectively include an X@origin positioning sensor 149 and a rotary encoder 1 for detecting Y@[i.
50 and lens reversal and cutting end sensor 151
As a result, the movement position and movement distance are detected.

Furthermore, as shown in this embodiment, the cutting pressure of the lens is determined by the weight thrusting motor 152, its origin positioning sensor 153 thrusting, light, and heavy position measuring sensor 1.
54 is used to control the carriage 113 by moving it up and down above the lens to be cut.

Therefore, in this device, the peripheral edge is processed by the cutting movement of the carriage 113 that holds the lens to the grindstone 103, and includes a motor and clutch drive device fiW108 with a built-in drive circuit, a pulse motor drive device 132,
It is controlled by a servo motor drive 140. These drive devices 155 include a CPU 156a and a memory 1.
56b, and is controlled by a control circuit 156 consisting of an arithmetic unit 156C.

Further, this circuit 156 includes a pattern/frame rotation angle detection means 164, a pattern/frame origin position sensor 165, a push-up, light, and heavy position setting sensor 15.
4. Origin positioning sensor 153, x! Detection signals from the origin positioning sensor 151, the lens rotation angle detection means 131, the edge thickness measurement positioning sensor +J-112, and the origin positioning sensor 111 are input. , and input and operation means 1 for display 156d and key switch 156e.
56f, whereby the peripheral edge processing device 1 of this device is numerically controlled.

The cutting information of the lens 114 is input to the control circuit 156 via the A/D converter 159, including measurement information of the lens template 157 and frame 158.

Next, the measuring means will be explained.

The measuring section 160 of this embodiment includes a lens template (pattern) measuring section 161 and a frame measuring section 162.

The template shape measurement information is provided by the template measurement potentiometer 40.
(Fig. 1) The frame measurement information detected by the rotary encoder 20 (Fig. 5) for detecting the rotation angle of the template and frame is transmitted to the frame window potentiometer 165.
and a rotary encoder 164 for detecting the rotation angle of the template frame.

The configuration of this measuring section is a combination of the lens template measuring device shown in Figures 1 to 5 with a frame measuring device. It is also possible to incorporate measuring devices.

Therefore, according to these configurations, the measurement data from the lens template 105 is converted into a digital signal and read into the control circuit, and this signal is used as lens cutting information to drive the carriage. II tll.

Since this drive of the carriage is detected by the carriage detection mechanism, the cutting information is constantly checked.

That is, the encoder 106 that checks the movement of the carriage to the grindstone is linked to the Y-axis drive servo motor, and the lens holding shaft is equipped with a rotary encoder for detecting the rotation angle. Cutting is performed while the information is checked, and when the cutting is completed, it is detected by lens rotation and a cutting end sensor (photo interrupter).

(Effect of the invention) Using a probe whose lens template contact surface has the same shape and size as the cutting wheel, calculate the distance from the rotation center of the lens template (reference position) to the rotation angle of the template. Since the measurement information is used as cutting information, there is no need to further process the measurement information as cutting information. The 4 configurations are simple and allow for accurate measurements.

As shown in this embodiment, the configuration of the template measuring machine is a simple mechanism such as one motor, encoder, and potentiometer, and the number of parts and steps is small, making it possible to reduce the manufacturing cost.

Lens template information can be stored on the computer, so
There is no need to use a template many times, and multiple lens edge processing machines can be controlled with this single data.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the lens template measuring device, FIG. 2 is a front view of FIG. 1, FIG. 3 is a right side view of FIG. 1, and FIG. FIG. 5 is a perspective view showing the glue structure shown in FIG. 1, FIG. 6 is a diagram showing the principle of lens template measurement, and FIG. 7 is a left side view of FIG. 1 is a diagram showing a schematic configuration of a numerically controlled lens peripheral edge processing device. 1... Lens template measuring device, 3... Lens template cutting 11... Narrow plate, 12...
・Narrow mounting base, 13...Narrow mounting shaft, 17
...Timing belt, 18...Encoder pulley, 20...Encoder, 21.
... Drive motor, 23.24 ... Guide shaft, 25 ... Slide plate, 26.27 ...
...Guide bearing stand, 32...Long spring, 3
4...The spring hook is the support, 37...
Type spring, 38...Wire, 39...
... Potentiometer mounting base, 40 ... Potentiometer, 41 ... Encoder pulley, 42 ... Wire, 43 ... Outer ring grooved guide bearing, 50 ... ... Lens peripheral processing device, 58 ... Grinding wheel motor, 59 ...
・CPLJ, 62... Control circuit, 63...
...Carriage, 64...Unprocessed lens, 67
...Holding shaft, 69...Drive motor,
79... Holding shaft rotation means, 80... Lens chuck motor, 92... Servo motor 97... Y-axis moving means, 97...・Detection means.

Claims (1)

[Scope of Claims] A numerically controlled lens peripheral edge processing device that obtains lens shape information from a lens template and cuts an unprocessed lens, comprising a rotation angle detection means, the peripheral surface of the lens template interlocked with the rotation means. , a measuring device having a linear movement means whose surface part is in contact and a detection means for detecting the movement, which has the same radius of curvature as the cutting wheel that cuts the unprocessed lens, and a displacement of the linear movement means with respect to the rotation of the template. The periphery of an unprocessed lens, characterized in that the distance from the center of rotation of the template to the center of curvature of the surface portion is measured with respect to the rotational angular position of the template, and the lens is cut based on the measured data. Processing equipment.