JPH08323600A - Grooving machine for spectacle lens - Google Patents

Abstract

PURPOSE: To make the management of a cutter part simple and to perform good grooving work at all times, in this grooving machine of a spectacle lens for grooving a peripheral edge of this spectacle lens. CONSTITUTION: Two magnets 3a and 3b are attached to both ends of a lens bearer 3 respectively. During the grooving work by a cutter 2, when this lens bearer 3 is tilted pressed by a lowermost end P1 of a spectacle lens 1, a difference is caused in each magnetic detection value of both magnetic sensors 4a and 4b, and if this difference becomes more than the fixed value, the spectacle lens 1 is controlled to move horizontally in the right direction as in the figure. When the spectacle lens 1 shifts in the right direction, the lowermost end P1 also shifts in the right direction. Therefore, an inclination of the lens bearer 3 becomes smaller. Subsequently, at a time when the lowermost end P1 comes up to an apex position of the cutter 2, the lens bearer 3 becomes almost horizontal and thereby the difference in the magnetic detection values of both these magnetic sensors 4a and 4b is eliminated. With this constitution, horizontal movement of the spectacle lens 1 is stopped and normal cutting is carried out at that position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an eyeglass lens grooving machine for digging a groove in the peripheral edge of an eyeglass lens, and more particularly to an eyeglass digging groove for passing a nylon thread or the like in the peripheral edge of an eyeglass lens for a rimless frame. The present invention relates to a lens grooving machine.

[0002]

2. Description of the Related Art Conventionally, in a groove digging machine for digging a groove for passing a nylon thread on the periphery of a spectacle lens for a rimless frame, the spectacle lens is held from both sides and the spectacle lens is rotated around the held portion as an axis. Then, the peripheral edge of the lens is cut against the cutter.

FIG. 8 is a schematic view showing a state of a conventional grooving process, (A) showing a good working state, and (B) showing a bad working state. First, the spectacle lens 81
Is held by a holding member (not shown) so as to be rotatable about a line passing through the lens center O and perpendicular to the paper surface. Further, the spectacle lens 81 is held so that the lowermost end of the spectacle lens 81 contacts the apex of the cutter 82 by its own weight. With such a setting, the cutter 82 has the shaft 8
It rotates at a high speed counterclockwise around 3, for example. At this time, the spectacle lens 81 also rotates counterclockwise at a low speed. As a result, the portion of the contact point P11 is cut, and a groove is formed on the peripheral edge of the spectacle lens 81. The contact point P1
Immediately after the contact between the eyeglass lens 81 and the cutter 82, 1 is at the edge portion of the eyeglass lens 81 as shown in the figure, but in normal processing, it is at a position above the depth of the cut groove.

However, if the contact position between the spectacle lens 81 and the cutter 82 becomes unbalanced, the contact between the two will be displaced from the apex of the cutter 82. That is, for example, as shown in FIG. 6B, the lower end portion on the left side of the spectacle lens 81 is lower than the apex of the cutter 82, and the contact point P12 is at the lens center O.
And the line connecting the center of the shaft 83 with the center of the shaft 83. If the processing is continued in such a state, the weight of the spectacle lens 81 is not evenly applied to the cut portion, so that there is a problem that the groove depth is not uniform and the finish accuracy is deteriorated.

Therefore, the applicant of the present application has already invented a groove-drilling machine which detects the inclination of the spectacle lens during cutting and maintains a normal processing state. FIG. 9 is a schematic view showing a state of a conventional grooving process for detecting the inclination of a spectacle lens. Note that, here, the same configurations as those in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted. In this grooving process, the lens pedestal 84 is provided so that the upper surface thereof is located slightly below the apex of the cutter 82. The lens pedestal 84 is rotatable about a shaft 84a. Further, shield rods 841 and 842 are attached to both ends of the lens pedestal 84, respectively. further,
Optical sensors 85 and 86 are provided below both ends of the lens receiving base 84.

With this structure, at the time of cutting, as in FIG. 8, the spectacle lens 81 and the cutter 82 are used.
Rotate counterclockwise together. At this time, if the lowermost end portion 81a of the spectacle lens 81 is displaced to the left side of the drawing with respect to the apex of the cutter 82, the lowermost end portion 81a is moved to the lens pedestal 8.
Push 4 down. As a result, the lens pedestal 84 rotates counterclockwise about the shaft 84a, and the shield rod 84 on the left side is rotated.
2 blocks the optical path of the optical sensor 86.

Upon detection of this, the control side drives a slide mechanism portion (not shown) to slide the spectacle lens 81 to the right in the drawing. Then, when the lowermost end portion 81a of the spectacle lens 81 moves to the vicinity of the apex of the cutter 82, the inclination of the lens pedestal 84 returns to a substantially horizontal state, and the shielding of the optical sensor 86 by the shielding rod 842 is released. As a result, the sliding of the spectacle lens 81 is stopped.

When the lens pedestal 84 is tilted to the right, the operation in the opposite direction is performed. By repeating these operations, the spectacle lens 81 is always in the cutter 8.
It is controlled to cut near the apex of 2.

[0009]

However, the optical sensor 8
Since the locations where 5, 6 are installed are close to the cutting portion, cutting chips, cutting fluid, etc. scatter and the optical sensor 8
It is easy to attach to 5,86. For this reason, the optical paths of the optical sensors 85 and 86 may be blocked regardless of the inclination of the lens pedestal 84, and the sensors may malfunction. From this, the optical sensors 85 and 86
Needs to be kept in a clean state at all times, which is troublesome to maintain.

The present invention has been made in view of the above circumstances, and provides a grooving machine for an eyeglass lens which is easy to control the cutter portion and can always perform good grooving. The purpose is to do.

[0011]

In order to solve the above-mentioned problems, the present invention provides a grooving machine for a spectacle lens for digging a groove in the rim of the spectacle lens, for digging a groove in the rim of the spectacle lens. A cutter, a cutter rotation drive mechanism section for rotationally driving the cutter, and a lens holding mechanism for holding the spectacle lens rotatably by sandwiching the spectacle lens from both sides and for bringing the peripheral edge of the spectacle lens into contact with the cutter side by its own weight. Section, a lens rotation driving mechanism section that rotationally drives the spectacle lens via the lens holding mechanism section, and the lens holding mechanism section so that the spectacle lens can move in a direction substantially along the blade of the cutter. A lens moving mechanism section, a lens pedestal that is pushed and tilted by the lowermost end of the spectacle lens when the lowermost end of the spectacle lens is displaced from the apex of the cutter, A pair of magnets is mounted on the lens pedestal substantially symmetrically about the rotation axis of the lens pedestal, a pair of magnetic sensors for detecting respective magnetic quantities of the pair of magnets, and the cutter is a predetermined one. Cutter rotation control means for controlling the cutter rotation drive mechanism portion so as to rotate at a rotation speed of, a lens rotation control means for controlling the lens rotation drive mechanism portion for rotating the spectacle lens, and the pair of magnets. Lens movement control that detects that the lens pedestal is tilted based on the detection state of the magnetic amount of the sensor and controls the lens movement mechanism section so that the lowermost end of the spectacle lens is located at the apex of the cutter. The present invention provides a grooving machine for spectacle lenses, which comprises:

[0012]

[Operation] The cutter for digging a groove on the periphery of the spectacle lens is
It is rotationally driven by the cutter rotational drive mechanism section. The lens holding mechanism section holds the spectacle lens from both sides so as to be rotatable, and causes the peripheral edge of the spectacle lens to contact the cutter side by its own weight. The spectacle lens is rotationally driven via the lens rotation drive mechanism section and the lens holding mechanism section.

The lens moving mechanism moves the lens holding mechanism so that the spectacle lens can move in a direction substantially along the blade of the cutter. When the lowermost end of the spectacle lens is displaced from the apex of the cutter, the lens pedestal is pushed by the lowermost end of the spectacle lens and tilts. A pair of magnets are attached to the lens pedestal substantially symmetrically around the rotation axis of the lens pedestal. The pair of magnetic sensors detect the respective magnetic quantities of the pair of magnets.

The cutter rotation control means controls the cutter rotation drive mechanism so that the cutter rotates at a predetermined rotation speed. The lens rotation control means controls the lens rotation drive mechanism section for rotating the spectacle lens. In such a state, the lens movement control means detects that the lens pedestal is tilted based on the detection state of the magnetic amount of the pair of magnetic sensors, and the lowermost end of the spectacle lens is located at the apex of the cutter. The lens moving mechanism unit is controlled as described above.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a perspective view showing a schematic configuration of the groove excavating machine of this embodiment. An arm 12 is provided on an upper part of a main body 11 of the groove digging machine 10 so as to be rotatable in a horizontal plane. A lens holding unit 13 is attached to the arm 12 via a shaft 14. The lens holding unit 13 is attached so as to be vertically rotatable about a shaft 14. The lens holding unit 13 is rotatable with the arm 12 in a horizontal plane.

Shafts 15 and 16 are provided in a recess 13a formed in the lens holding unit 13. This axis 1
Lens holders 15a and 16a are attached to the lens holders 5 and 16, respectively.
The spectacle lens 1 is held between a. The shaft 16 is formed with a thread groove, and the lens holder 16a can be brought into pressure contact with the spectacle lens 1 by turning the handle 16b.

The spectacle lens 1 attached to the lens holding unit 13 contacts the cutter 2 in the base unit 18 by its own weight. At this time, both sides of the lower end of the spectacle lens 1 are held by the guide arm 17.

A swing motor 19 is provided in the main body 11 of the groove making machine 10. The swing motor 19 drives the arm 12 to rotate in a horizontal plane via a shaft 19a. A position detector (not shown) is provided in the swing motor 19 to detect the current turning position. A cutter motor 21 is provided in the main body 11. This cutter motor 21 is used for the belt 2
The cutter shaft 23 is rotationally driven via 2 to control the rotation of the cutter 2.

On the other hand, a lens motor 20 is provided in the lens holding unit 13. The lens motor 20 rotationally drives the shaft 15 via a gear or the like to control the rotation of the spectacle lens 1.

Each of these motors, sensors, etc.
It is controlled by a control unit, which will be described later, provided therein. FIG. 3 is a partial cross-sectional view showing a specific configuration of the processed portion of the spectacle lens 1. The lens holder 15a for holding the spectacle lens 1 is fixed to the shaft 15,
Rotate with. On the other hand, the lens holder 16a has a shaft 1
6 is rotatably attached. For this reason,
In a state where the spectacle lens 1 is held between the lens holders 15a and 16a, when the lens motor 20 shown in FIG. 2 is driven to rotate the shaft 15 and the lens holder 15a, the spectacle lens 1 and the lens are correspondingly rotated. Holder 16
a rotates.

The held spectacle lens 1 has its lower end portion held between the guide rollers 171a and 172a of the arm portions 171 and 172 of the guide arm 17, respectively. The guide rollers 171a and 172a sandwich the spectacle lens 1 from both sides so that the peripheral portion of the spectacle lens 1 is always positioned on the cutter 2.

At the center of the base unit 18, the lens pedestal 3 is axially supported by the shaft members 18a and 18b. An elongated hole X1 that extends in a direction substantially horizontal to the surface of the spectacle lens 1 is formed substantially at the center of the lens holder 3. The apex of the cutter 2 is attached to the shaft 23 so as to protrude from the long hole X1 of the lens receiving base 3 toward the spectacle lens 1 side by a predetermined amount.

FIG. 4 is a view as seen from the front side of the spectacle lens 1 to show the schematic structure of the lens cradle 3. As described above, the lens pedestal 3 is axially supported by the base unit 18 by the shafts 18a and 18b, and both ends thereof are vertically movable. However, both ends of the lens pedestal 3 are connected to the main body 11 side by springs (not shown), and are always kept horizontal unless a force is applied from the outside. Magnets 3a and 3b are attached to both ends of the lens cradle 3, respectively.

The base unit 18 includes a lens cradle 3
The sensor unit 4 is attached below. Magnetic sensors (Hall elements) 4a and 4b are attached to both ends of the sensor unit 4 at positions facing the magnets 3a and 3b, respectively. The magnetic sensors 4a and 4b detect magnetism having a magnitude according to the distance from the magnets 3a and 3b, respectively. This magnetic detection signal is sent to the control unit described later.

Next, the operation of the grooving machine 10 of this embodiment having the above structure will be described. At the start of the grooving process, the spectacle lens 1 is moved to the top of the cutter 2 as shown in FIG.
The lens holders 15a and 16a shown in FIG. When this operation is completed and an operation switch (not shown) of the groove cutting machine 10 is pressed, the lens motor 20 and the cutter motor 22 shown in FIG. 2 rotate. As a result, the spectacle lens 1 rotates counterclockwise about the lens center O as shown in FIG. At the same time, the cutter 2 also rotates counterclockwise.

If the spectacle lens 1 is a perfect circle, FIG.
As described above, the lens pedestal 3 is dug while keeping the horizontal state. However, since a normal spectacle lens is not circular, as the spectacle lens 1 is rotated, a portion which is lower than a portion cut by the cutter 2 is necessarily generated. Therefore, the lens pedestal 3 tilts.

FIG. 1 is a view showing an example of a state in which the lens pedestal 3 is tilted. Here, the lowermost end P of the spectacle lens 1
A case where the left side of the lens pedestal 3 is tilted by being pushed by 1 is shown. In this case, the magnet 3a on the left side comes closer to the magnetic sensor 4a than in the horizontal state, and the magnetic detection amount increases. On the other hand, the magnetic sensor 3b on the right side is separated from the magnetic sensor 4b,
The amount of magnetic detection decreases. When the difference between the two magnetic detection amounts becomes a certain value or more, the swing motor 19 shown in FIG. 2 is driven, the arm 12 is rotated, and the spectacle lens 1 is horizontally moved rightward in the drawing.

When the spectacle lens 1 moves to the right, the lowermost end P1 of the spectacle lens 1 also moves to the right. Therefore, the inclination of the lens pedestal 3 becomes small. Then, as shown in FIG. 5, when the lowermost end P1 reaches the position of the apex of the cutter 2, the lens pedestal 3 is in a substantially horizontal state, and there is no difference in the magnetic detection amounts of the magnetic sensors 4a and 4b. As a result, the swing motor 19 is stopped, and the spectacle lens 1 is normally cut at that position. In this case, the cutting point is located above P1 by the depth of the groove.

On the other hand, contrary to FIGS. 1 and 5, when the right side of the lens holder 3 is tilted, the spectacle lens 1 is moved leftward. In this case, other operations may be almost the same as described above.

In this way, the spectacle lens 1 is processed from the start of grooving to one revolution. FIG. 6 is a block diagram showing the main hardware configuration on the control side of the groove excavating machine 10 that performs such an operation. The main body 1 of the groove making machine 10
A control unit 30 composed of logic is provided in the unit 1. The output signals of the magnetic sensors 4a and 4b are sent to the amplifier 31. The amplifier 31 differentially amplifies the output signals of the magnetic sensors 4a and 4b, and sends the differential amplified signal to the control unit 30 and the relay circuit 32.

The relay circuit 32 sends the differential amplified signal from the amplifier 31 to the driver 33 in response to a command from the control unit 30. The driver 33 determines the rotation direction of the swing motor 19 in accordance with the positive / negative state of the differential amplified signal, that is, in which direction the lens pedestal 3 is tilted, and rotates the swing motor 19 in that direction at a constant speed.

Further, the relay circuit 32 is connected to the control unit 3
A command from 0 sends an operation command to the driver 34.
The driver 34 controls the rotation of the lens motor 20.
The driver 35 receives a command from the control unit 30
The cutter motor 21 is rotated.

The switch board 36 is provided with operation command switches and the like so that the operator can operate the grooving machine 10. The position detector 37 is built in the swing motor 19. The position detector 37 detects a reference position and a limit position in both positive and negative directions centering on the reference position, and outputs the position detection signal to the control unit 3.
Send to 0.

The pulse sensor 38 is used for the lens motor 20.
The rotation amount of is detected. The control unit 30 detects the rotation angle of the spectacle lens 1 based on the rotation amount of the lens motor 20.

FIG. 7 is a flow chart showing the control procedure of the groove excavation processing by the control unit 30. [S1] Lens motor 20 and cutter motor 21
Is driven to rotate the spectacle lens 1 and the cutter 2. [S2] Based on the differentially amplified signal, it is determined whether or not the inclination of the lens pedestal 3 is large. If the inclination is large, the process proceeds to step S3, and if not, the process proceeds to step S4. [S3] The swing motor 19 is driven to horizontally move the spectacle lens 1 in the direction corresponding to the direction of the differential amplified signal. [S4] It is determined whether or not the spectacle lens 1 has made one rotation from the processing start position. If the spectacle lens 1 has made one rotation, the process proceeds to step S5, and otherwise returns to step S2. [S5] The lens motor 20, the cutter motor 21 and the like are stopped, and the grooving process is completed.

As described above, in the present embodiment, the magnetism of the magnets 3a and 3b attached to the lens pedestal 3 is detected by the magnetic sensors 4a and 4b, and the lens pedestal is detected according to the difference in the detected magnetic quantities. Since the inclination of 3 is detected, cutting dust, cutting fluid, etc. scatter and the magnetic sensor 4
There is no possibility that the sensor will malfunction even if it adheres to a and 4b. Therefore, the management of the cutter is easy,
It is possible to always carry out good grooving.

[0037]

As described above, according to the present invention, when the lowermost end of the spectacle lens is displaced from the apex of the cutter, the lens pedestal is provided which is pushed and tilted by the lowermost end of the spectacle lens. , A pair of magnets are attached to the target about the rotation axis, and while the cutter is performing grooving on the peripheral edge of the spectacle lens, the magnetic amount of the pair of magnets is detected by a magnetic sensor to When the pedestal is tilted, the eyeglass lens is controlled to move so that the lowermost end of the eyeglass lens is located at the apex of the cutter in this case, so cutting chips and cutting fluid scatter during machining. There is no risk of the sensor malfunctioning even if it adheres to the magnetic sensor. For this reason, it is possible to always carry out excellent grooving processing while the management of the cutter portion is easy.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a state where a lens pedestal is tilted.

FIG. 2 is a perspective view showing a schematic configuration of a groove excavating machine of this embodiment.

FIG. 3 is a partial cross-sectional view showing a specific configuration of a processed portion of a spectacle lens.

FIG. 4 is a view seen from the front side of the spectacle lens to show the schematic configuration of the lens pedestal.

FIG. 5 is a diagram showing a state where the lens pedestal has returned to a horizontal position.

FIG. 6 is a block diagram showing a main hardware configuration on the control side of the groove digging machine.

FIG. 7 is a flowchart showing a control procedure of grooving processing by the control unit.

FIG. 8 is a schematic view showing a state of a conventional grooving process,
(A) is a figure which shows a favorable processing state, (B) is a figure which shows a bad processing state.

FIG. 9 is a schematic view showing a state of a conventional grooving process for detecting the inclination of the spectacle lens.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Eyeglass lens 2 Cutter 3 Lens cradle 3a, 3b Magnet 4a, 4b Magnetic sensor (Hall element) 10 Grooving machine 11 Main body 12 Arm 13 Lens holding unit 14, 15, 16 Axis 15a, 16a Lens holder 17 Guide Arm 18 Base unit 19 Swing motor 20 Lens motor 21 Cutter motor 30 Control unit 31 Amplifier 33, 34, 35 Driver 36 Switch board

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Juro Yoda 2-7-5 Nakaochiai, Shinjuku-ku, Tokyo Hoya Corporation

Claims (3)

[Claims] 1. A spectacle lens grooving machine for digging a groove in the rim of an spectacle lens, comprising: a cutter for digging a groove in the rim of the spectacle lens; and a cutter rotation drive mechanism section for rotationally driving the cutter. A lens holding mechanism section that holds the spectacle lens from both sides so that the spectacle lens is rotatably held, and causes the peripheral edge of the spectacle lens to contact the cutter side by its own weight; and the spectacle lens through the lens holding mechanism section. A lens rotation drive mechanism unit that rotates, a lens moving mechanism unit that moves the lens holding mechanism unit so that the eyeglass lens can move in a direction substantially along the blade of the cutter, and a lowermost end portion of the eyeglass lens is A lens cradle that is pushed by the lowermost end of the spectacle lens and tilts when it is displaced from the top of the cutter, and a rotation axis of the lens cradle is centered on the lens cradle. A pair of magnets that are attached to almost the target, a pair of magnetic sensors that detect the respective magnetic quantities of the pair of magnets, and the cutter rotation drive mechanism unit so that the cutter rotates at a predetermined rotation speed. Cutter rotation control means, lens rotation control means for controlling the lens rotation drive mechanism to rotate the spectacle lens, and the lens pedestal is tilted based on the detection state of the magnetic amount of the pair of magnetic sensors. And a lens movement control means for controlling the lens movement mechanism section so that the lowermost end of the spectacle lens is located at the apex of the cutter. Processing machine. 2. The groove digging machine for a spectacle lens according to claim 1, wherein the pair of magnetic sensors are Hall elements. 3. The groove digging machine for a spectacle lens according to claim 1, wherein the pair of magnetic sensors are integrally mounted.