JPH03259710A - Lens shape measuring instrument and grinding device provided with same - Google Patents

Abstract

PURPOSE:To simplify the device mechanism and to enable digital control by providing a measuring element which hold the abutting part of a body to be measured corresponding to various items for measurements of edge thickness and the shape of a lens with a groove and a position changing means which make an abutting part for edge thickness abut on the front and rear refracting surfaces of the body to be measured in order. CONSTITUTION:A measurement shaft 121 where the measuring element 120 of the lens shape measuring instrument 100 is fixed at the tip part is movable in the axial direction and turned over on the axis by 180 deg.. Consequently, the edge thickness measurement part 120b of the measuring element 120 can measure the front and rear refracting surfaces of a lens to be worked in order. Further, the measuring element 120 is provided with a groove measurement part 120c and then the groove position of the lens to be machined after groove machining can be measured, so that even a machine under the digital control copes with frame changing operation by using the measurement data.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a peripheral processing machine that automatically processes bevels on the peripheral edges of spectacle lenses.

[Prior Art] A conventional device of this type uses a first probe to measure the front refractive surface of the lens to be processed, and a second probe to measure the back refraction surface for edge thickness measurement, which is a type of lens shape measurement. Each surface was configured to follow a virtual edge trajectory obtained from the shape data of the lens frame of the eyeglass frame, and the lens edge thickness after processing could be calculated from the data obtained thereby. .

In addition to the usual processing, which involves processing an unprocessed lens based on the frame shape based on the frame shape data, attaching bevels, and fitting the lens into a frame, we can also frame it in a -degree frame. For example, when converting a lens that is used for storage to a new frame because the frame is old, you can use the lens with the bevel that was used in the training camp as is, and make only the frame smaller than the old frame. The so-called "frame change" machining process, in which the bevel positions set in the past are reused as they are, was processed in a machining mode called free machining.

[Problems to be Solved by the Invention] In the conventional technology as described above, when measuring the expected edge thickness of a lens after processing, a measuring element for contacting the lens, a means for moving the same, and a measuring means are required. There was a problem that two of each were required, resulting in a mechanically complicated configuration. Also"
In order to change the frame, the head of the ball-sliding machine must be very light and have a mechanism that allows it to slide left and right to allow free machining, which makes the mechanism complicated. I was also carrying something.

The present invention was made in view of such conventional problems,
To provide a lens shape measuring device that can measure the expected edge thickness after lens processing with a simple mechanism, and to be equipped with the lens shape measuring device to perform "frame change-2" work without using free processing. The object of the present invention is to provide a lens grinding device that performs lens beveling work using digital control and has a simple mechanical configuration.

[Means to solve problems]

In order to achieve the second object, the present invention includes a measuring point, a moving means for moving the measuring point, a detecting means for detecting the amount of movement of the measuring point moved by the moving means, and a measuring point detected by the detecting means. In a lens shape measuring device having calculation means for calculating a value suitable for a measurement item from data, contact with an object to be measured for at least edge thickness measurement and shape measurement of a beveled lens among the measurement items. 180 in order to sequentially abut the measuring element having a measuring element corresponding to each item and the measuring element contacting part for measuring the edge thickness on the front refracting surface and the rear refracting surface of the object to be measured. ° A contact position changing means for reversing the contact position; a contact point; a moving means for moving the contact point; a detection means for detecting the amount of movement of the contact point moved by the moving means; The lens shape measuring device includes a calculation means for calculating a value suitable for the measurement item from the detected data, and includes a holder for holding the lens to be processed, a grindstone for grinding the lens, and a grinding wheel for grinding the lens. In a grinding device equipped with a bevel grinding wheel for beveling a lens, at least four of the measurement items mentioned above include measuring the edge thickness and measuring the shape of the beveled lens at the contact part with the object to be measured. Inverting the measuring element corresponding to each item and the measuring element abutting part for measuring the edge thickness by 180 degrees in order to bring them into sequential contact with the front refracting surface and the rear refracting surface of the object to be measured. A means for solving the problem is to have a contact position changing means.

[Effect]

In the present invention, the measuring shaft fixed to the tip of the measuring head is movable in the axial direction, and the measuring shaft has a diameter of 180'' at the center of the shaft.
Since it is configured to be inverted, it is possible to sequentially measure the front refractive surface and the rear refractive surface of the lens to be processed with the edge thickness measuring section of one measuring point, and it is possible to measure the front refractive surface and the rear refractive surface of the lens to be processed sequentially, making it possible to measure the edge thickness measurement section of a single measuring point. There is no inconvenience in having this mechanism.

In addition, by providing a bevel measuring section on the probe, it has become possible to measure the bevel position of a lens to be processed that has already been beveled. However, in the past, it was impossible to process lenses for "frame replacement" without a lens processing machine with a mechanism that allows free processing, but now there is a processing machine that uses this measurement data to process lenses under digital control. However, we can handle the work of changing the frame.

〔Example〕

FIG. 1 is a partially cutaway perspective view showing the overall configuration of a lens peripheral edge processing machine according to an embodiment of the present invention. A support bearing 6 fixed to the main body frame 1 fits a support shaft 7 so as to be movable in the axial direction.

An end of the head frame 2 is rotatably fitted into the support shaft 7 with the thrust 1 restricted in one direction.

The end of the support shaft 7 is fitted into a member 8 for moving the head frame 2, forming a body. The member 8 is the shaft 11
The rack 12 is slidably supported in the axial direction of the support shaft, and the rack 12 is fixed thereto. Shirts I-11
are support members 10a and lOb fixed to the main body frame 1.
Both ends of the support shaft 7 are fitted in parallel with the support shaft 7.

Further, a rack 12 fixed to the side surface of the member 8 meshes with a pinion 13a fitted to the rotating shaft of a head frame lateral movement motor 13, which is a pulse motor.

With this configuration, when the motor 13 rotates, the member 8 is moved in the axial direction of the shaft at the fitting portion with the shirts 1 to 11, and the support shaft 7 integrated with the member 8 is moved. Therefore, the bend frame 2 is moved in the axial direction of the support shaft in accordance with the rotational direction of the motor 13.

On the other hand, a lower moving shaft 20 is fitted into a cylinder 23 fixed to the main body frame so as to be slidable in the upper limit direction. A roller 21 is rotatably attached to the tip of the vertical movement shaft 20, and a stopper member 2 is fixed to the lower part of the head frame 2.
It is in contact with 4. A rank 20a is formed on the vertically moving shaft, and meshes with a pinion 22a fitted to the rotating shaft of a two-stroke moke 22, which is a pulse motor. With this configuration, when the motor 22 rotates, the vertical movement shaft 20 is moved in the vertical direction, and the roller 21 and the stopper member 24 are moved vertically.
The head frame 2 rotates around the support shaft 7 via the support shaft 7.

The head frame 2 is formed with a recess for arranging a member that holds the lens LE to be processed, and is arranged inside this recess, and the lens holding shaft 30a and the lens holder, which are the members, are coaxial and It is rotatably supported. The lens holding shaft 30a has a known holding mechanism (not shown), and holds the lens LE between the shafts 30a and 30b. Lens holding shaft 3
0a, the lens holder has a pulley 31 on each shaft 30b.
a and 31b are attached, and a rotating shaft 36 having pulleys 33a and 33b at both ends is provided inside the head frame 2. A gear 34 is attached to one end of the rotation shaft 36, and meshes with a pinion 35a attached to the rotation shaft of a lens rotation motor 35, which is a pulse motor. Pulleys 31a, 31b and pulley 33
Healds 32a and 32b are provided between a and 33b, respectively. With these configurations, the lens rotation motor 3
When 5 rotates, the lens LE rotates.

Further, a grindstone 3 and a grindstone rotation motor 5 are disposed on the main body frame 1, and pulleys 51 and 52 are attached to both of them, respectively, and they are connected by a heald 53.

A lens shape measuring device 100 is attached to the main body frame 1 at a predetermined position above the head frame 2 .

Here, the lens shape measuring device will be explained.

The lens shape measuring device is used to detect the outer diameter, edge thickness, bevel position, etc. of the lens, and is shown in Figures 2 and 3 below.
This will be explained based on the diagram. FIG. 2 is a perspective view showing the external appearance of the lens shape measuring device, and FIG. 3 is a sectional view taken along the line AA' in FIG.

Base frame l, 101 has two guide rails 102a
, 102b are extended in parallel, and both ends thereof are fixed to the frame on the base. This guide rail 102a,
A Y-direction moving table 103 is slidably disposed on 102b. Two supporting members 110 and 111 are fixedly mounted on the moving table 103.
Between 0.111 and 110.111, both ends of the support member 110.111
Parallel rails 113a and 113b are fixedly attached to the rails 113a and 113b. A χ direction moving table 112 is slidably disposed on this parallel rail. A measuring shaft 121 is rotatably fitted into the movable table 112, and movement in the axial direction is restricted by rings 123 and 127 attached to the measuring shaft 121. A wave washer 128 is held between the ring 127 and the moving table 1]1, and a switch 129 is provided at the bottom of the moving table 112. The measurement axis 121 moves in the Y direction (and the ring) 2
7 comes into contact with the switch 129 to turn it on. However, since the force of the wave washer 128 is normally applied, the switch 129 is turned off.

A measuring stylus 120 is fixed to the tip of the measuring shaft 121. The measuring element 120 is a lens outer diameter or template measuring part 120a.
, an edge thickness measuring section 120b, and a bevel measuring section 120c. A tension spring 104 is suspended between the movable table 103 and the base frame 101. On the other hand, a rack 107 is formed at one end of the moving table 103, and is connected via a clutch 106 to a Y-direction moving motor 105, which is a pulse motor. A gear 106a is fitted to one rotating shaft of the crank and punch 106, and meshes with a pinion 105a fitted to the rotating shaft of the motor 105.
The pinion 106b fitted on the other rotating shaft is connected to the rack 1.
It meshes with 07.

With this configuration, when the clutch 106 is OFF, the moving table 103 is pulled to the left with respect to the drawing by the force of the tension spring 04. Also, the clutch 106 is
When it is N, when the motor 105 rotates, it moves in the Y direction.

A rack 107 is formed at the other end of the movable table 103 and meshes with a pinion 108a fitted to the rotating shaft of the encoder 109. With this configuration, the amount of movement of the moving table 103 is detected by the encoder 109. X-direction moving table 112 and support member 110.11
There are four compression springs 114a, 114b, 114 between
c, 114d are passed, and the moving table 112 is
It is always energized with a force that brings it to a neutral position.

- between force support members 110, 111 said support members 11;
A rack 115 with both ends fixed to a 0.111 mm is disposed and meshes with a pinion 116a fitted to the rotating shaft of an encoder 116 attached to a moving table 112. With this configuration, the amount of movement of the moving table 112 can be detected by the encoder 116.

A gear 126 is fitted to the end of the measurement shaft 121.
It meshes with a gear 125a fitted to the rotating shaft of a measurement shaft rotor 125, which is a pulse motor. With this configuration, the measurement shaft 121 can be rotated by rotation of the motor 125. Further, a solenoid 124 is fixed to the Y-direction moving table opposite to the end of the measuring shaft 121, and when the solenoid 124 is turned on, it joins with the end of the measuring shaft 121. By turning on the solenoid 124, the measuring shaft 121 can be fixed.

The operation of the lens shape measuring device constructed as described above will be explained with reference to FIGS. 1 to 6.

FIG. 4 is an explanatory diagram of measuring the outer diameter of an unprocessed lens. First, the head frame 2 is moved to a predetermined position for outer diameter measurement without moving the motor 13.22. Next, turn on the clutch 106, move the motor 105, and move the moving table 103 to the contact point 1.
20a until it comes into contact with the lens.

(Fourth [E(a)(b) The switch 129 detects that the probe 120a has contacted the lens.The switch 129
When the clutch 106 is turned on, the clutch 106 is turned off. Since the movable table 103 is urged toward the lens by the springs 104, even when the clutch 106 is turned off, the probe 1
20a remains in contact with the lens. Here motor 3
5 to rotate the lens 360 degrees, and the amount of movement of the movement table 103 for each angle is determined by the encoder 109.
Read with. This determines the lens outer diameter.

Next, the case of measuring the shape of the template will be explained with reference to FIG.

The template adapter 150 is replaced with a regular lens suction member on the lens rotation shaft 30b, and the template 151 is set on the template adapter 150. Thereafter, measurements are carried out in the same manner as in the case of the ordinary lens described above.

FIG. 6 is an explanatory diagram of lens edge thickness measurement.

Already measured frame frame shape data (ρ., θr
, (n-0, ■, 2...n), the lens edge thickness is measured.

First, the clutch 106 is turned ON, and the measuring stylus 102 moves the moving table 103 to the first information (ρ., R7).

, θ. ), the motor 105 is rotated and moved to a position corresponding to . Next, attach the head frame 2 to the motor 13.
22. 35 to a predetermined position for measuring the lens R1 surface (corresponding to the above (R0, θ.) and in contact with the probe 120b). (FIGS. 6(a) and (b)) Here, the motor 35 is rotated to rotate the lens by 36°. That θ. The motor 105 is moved so that the position of the probe 120b is ρ. (R7, θ,,)
The amount of movement of the moving table 112 in X1. , is read by the encoder 115. Motor 1 after measuring the entire circumference of R1 surface
3. Move 22 to move the head frame 2 in the direction away from the probe. Thereafter, the motor 105 is activated to once move the moving table 103 in the direction in which the probe is retracted. Here, the motor 125 is rotated, and the measuring head 12
Invert 0 by 180°. Next, the motor 13 is rotated to move the head frame 2 to the measuring element 120b side, and then the moving table 103 is moved so that the measuring element 102b is (ρ., R0).
The motor 105 is rotated and moved to a position corresponding to . Next, the head frame 2 is moved to a predetermined position for measuring the R2 surface in the same way as when measuring the R1 surface. (Figure 6 (C))
Thereafter, the amount of movement X2n of the moving table 112 is determined in the same manner as when measuring the R1 surface. From Xln and XZn (ρi,
The lens edge thickness at θll) can be determined.

FIG. 7 is an explanatory diagram of beveled lens measurement.

First, the head frame 2 is moved to a predetermined position for measuring the beveled lens by driving the motor 13.22. Here, the clutch 106 is turned ON and the motor 105 is activated to move the moving table 103 until the probe 120a comes into contact with the end surface of the lens. The contact is detected by the switch 129. (FIG. 7(a)) When the switch 129 is turned 5N, the clutch 106 is turned off, and the solenoid 124 is turned on to fix the movement of the moving table 112. Here, the head frame 2 is moved by rotating the motor 13 until the bevel of the lens enters the contact point 120c. (Figure 7(b)) The bevel is the contact point 1.
20c is detected by reading the movement of the moving table 103 with the encoder 109. When the bevel enters the probe 120c, turn the solenoid 124 to O.
FF. In this state, the lens is rotated 360° by rotating the motor 35. By reading the movement amount of the movement table 112 for each angle with the encoder 116, θ is determined. You can see the bevel position. Also, by reading the movement amount of the movement table 103 with the encoder 108, θ is determined. Find the radial length at .

Next, the frame change work will be explained.

First, using a known frame shape measuring device (not shown),
Frame shape data for each angle (R1, θ,)
Measure as. Thereafter, the lens with the bevel formed thereon, which is to be reused 6, is adsorbed with adsorbent rubber according to the prescription in the same way as a normal unprocessed lens. When the lens attached to this suction rubber is measured according to the method for measuring lenses with bevels described above, the lens outer shape data (ρ”) is obtained.

, θゎ) and the movement data of the bevel in the X-axis direction (Xy R7
) can be found.

At this point, if there is an angle point where the lens outer shape data (ρ゛1, θ,) is smaller than the frame shape data (ρ., θ.), it is impossible to fit the reused lens into the new frame. As a result, the lens shape measurement work will be discontinued. If the lens outer diameter data (ρ゛1, θ, . . . ) is larger than the frame shape data (ρ., R7) over the entire circumference, the process proceeds to the next step.

Next, from the already determined lens outer diameter data (ρ"0, θゎ), find the point I-row (ρ゛1 - Δρ, θ) that is a distance slightly larger than the height of the bevel: Δρ. Next, According to the procedure for measuring the lens edge thickness described above, (ρ゛ゎ−Δρ, θ
The lens edge thickness (X'., θ.) at , , ) is determined.

From this edge thickness index (X', , θ7) and the already determined data on the movement of the bevel in the X-axis direction (Xya, θ), the measured position of the bevel of the lens is determined by the ratio of its edge thickness. Data on whether there is a bevel apex at (H
l, θ7) for the entire circumference.

Next, according to the above-mentioned procedure for measuring the lens edge thickness, measure the edge thickness of the point (ρΔρ, θ,) that is inside by Δρ from point 1 of the frame shape data (ρ7, θ, ,) that has already been obtained, and then Expected edge thickness data (xn, θ,
, ).

Next, from the already obtained bevel position ratio data (HI, θ.) over the entire circumference of the reused lens and the expected edge thickness data (X, , θ.) after processing, we calculate the same as the bevel position ratio of the reused lens. The bevel position after machining can be determined.

After that, the grindstone rotation motor 5 is rotated to rotate the grindstone 3 in the same way as beveling in the finishing process of a normal lens. The lens outer shape and bevel are formed by the synchronous rotation of the lenses.

(Effects of the Invention) As described above, according to the present invention, it is possible to measure the expected edge thickness after processing the lens shape using only one probe, which simplifies the mechanism of the lens shape measurement unit. There is an effect that can be done.

In addition, until now, it was not possible to process lenses for so-called "frame replacement" without a lens processing machine with a mechanism that allows free processing, but now we have a structure that allows measurement of the lens bevel position and lens edge thickness. , There is no free processing mechanism (there is also the advantage of being able to process lenses for ``frame change'' work even with lens processing machines that digitally control all lens beveling.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the device according to the present invention, FIG. 2 is a perspective view showing a lens shape measuring device of the device according to the present invention, and FIG. 3 is A-A in FIG. 2. 4 is a diagram illustrating the measurement of the outer diameter of an unprocessed lens; FIG. 4(a) is a plan view, and FIG. Figure 5 is a diagram explaining the shape measurement of the template, Figure 6 is a diagram explaining the edge thickness measurement, and Figure 6 (a) is the state of contact between the front refracting surface and the measuring head. C) shows the state of contact between the rear refracting surface and the probe, FIG. 6(b) explains the movement trajectory of the probe based on frame shape data, and FIG. 7 explains the measurement of a lens with a bevel. FIG. 7(a) shows the time before setting the measuring head, and FIG. 7(b) shows the time after setting the measuring head. [Explanation of symbols of main parts] 100... Lens shape measuring device, 120
・・・・・・・・・? ! 1! ] Teiko, 120a...
... Lens outer diameter or template measuring section, 120b...
Edge thickness measurement section, 120c...Bevel measurement section, 121...Measurement axis. 0 78 120σ Figure 7

Claims (2)

[Claims] (1) A measuring point, a moving means for moving the measuring point, a detecting means for detecting the amount of movement of the measuring point moved by the moving means, and a value suitable for the measurement item from the data detected by the detecting means. In the lens shape measuring device, the lens shape measuring device has a calculation means for calculating at least the contact portion with the object to be measured for measuring the edge thickness and the shape of the beveled lens among the measurement items.
18 for sequentially bringing the measuring element corresponding to each item and the measuring element abutting part for measuring the edge thickness into contact with the front refracting surface and the rear refracting surface of the object to be measured;
A lens shape measuring device characterized by having a contact position changing means for inverting the lens shape by 0°. (2) A measuring point, a moving means for moving the measuring point, a detecting means for detecting the amount of movement of the measuring point moved by the moving means, and a value suitable for the measurement item from the data detected by the detecting means. A holder for holding a lens to be processed, a grindstone for grinding the lens, and a beveling grindstone for beveling the lens after grinding. A grinding device comprising: a measuring element having a contact portion with the object to be measured for measuring at least the edge thickness and the shape of the beveled lens, corresponding to each of the measurement items; and the edge. 18 for sequentially bringing the measuring stylus contact portion for thickness measurement into contact with the front refracting surface and the rear refracting surface of the object to be measured;
A grinding device characterized by having a contact position changing means for inverting the position by 0°.