JPH08323601A - Grooving machine - Google Patents

Abstract

PURPOSE: To quickly correct dislocation of a cutting position between a spectacle lens and a cuter in a grooving machine for the spectacle lens for grooving a groove on the peripheral edge of the spectacle lens. CONSTITUTION: Magnets 3a and 3b are fitted respectively on both the ends of a lens pedestal 3. During grooving working by a cutter 2, when the pedestal 3 is tilted by the pushing of the utmost lower end part P1 of a spectacle lens 1, a difference is caused to each magnetism detection quantity of magnet sensors 4a and 4b to control the horizontal movement of the lens 1 in a right direction in a figure at a speed in accordance with the value of the difference. When the utmost lower end part P1 of the lens 1 reaches the position of the top of the cutter 2, the pedestal 3 becomes to a neary horizontal condition to eliminate the difference of the magnetism detection quantity of the sensors 4a and 4b. Consequently, the horizontal movement is stopped to perform normal cutting while rotating the lens 1 at the 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. 9 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. 10 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. 9 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, an optical sensor 85 is provided below both ends of the lens receiving base 84.
And 86 are provided.

With this structure, at the time of cutting, as in FIG. 9, 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
In Nos. 5 and 86, the lens pedestal 84 cannot be detected until the lens pedestal 84 is tilted by a certain angle or more. Further, the speed at which the spectacle lens is moved after the tilt is detected is always constant.
For this reason, the reaction of correcting the position of the spectacle lens 81 is delayed, an inappropriate processing state continues due to the delay, and there is a problem that the depth of the groove varies.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a grooving machine for a spectacle lens which can promptly correct the deviation of the cutting position between the spectacle lens and the cutter. To aim.

[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. Detecting that the lens pedestal is tilted based on the detection state of the magnetic amount of the sensor, and the lowermost end of the spectacle lens moves toward the apex of the cutter at a speed according to the detection state of the magnetic amount. A lens movement control device for controlling the lens movement mechanism section as described above is provided.

[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 spectacle lens at a speed according to the detection state of the magnetic amount. The lens moving mechanism is controlled so that the lowermost end of the lens moves toward the apex of the cutter.

[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 and further slides in the axial direction of the shaft 14.

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. Swing motor 19
Drives the arm 12 to rotate in the horizontal plane via the 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. The cutter motor 21 rotationally drives the cutter shaft 23 via the belt 22 to control the rotation of the cutter 2.

On the other hand, a lens motor 20 is provided in the lens holding unit 13. Lens motor 2
0 drives the shaft 15 to rotate 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 held by the lens holders 15a and 16a so that the lowermost end of the spectacle lens 1 comes to the apex of the cutter 2, as 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 around the lens center O at a constant speed, 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 magnetic detection amounts of the two is sensed, the swing motor 19 shown in FIG. 2 starts rotating, and the rotation speed increases in accordance with the difference between the magnetic detection amounts.
Then, the arm 12 rotates at a speed corresponding to the rotation speed of the swing motor 19, and the spectacle lens 1 is horizontally moved rightward in the drawing. On the other hand, at this time, the lens motor 20
The rotation speed decreases in accordance with the difference in the amount of magnetic detection,
Accordingly, the rotation speed of the spectacle lens 1 also decreases.

FIG. 5 is a diagram showing an example of the characteristics of the horizontal movement speed and the rotation speed of the spectacle lens 1. Here, FIG.
When the left side of the lens holder 3 shown in FIG. 1 is tilted downward in FIG. 1, the tilt is positive, and the horizontal movement of the spectacle lens 1 in the right direction is positive. Line L1 is the characteristic of horizontal movement of the spectacle lens 1, and line L2 is the characteristic of rotation of the spectacle lens 1. As can be seen from the figure, when the inclination of the lens holder 3 is small, the horizontal speed of the spectacle lens 1 is 0, and conversely, the rotation speed of the spectacle lens is high.

When the spectacle lens 1 moves to the right according to such characteristics, the lowermost end P1 of the spectacle lens 1 also moves to the right. As the inclination of the lens pedestal 3 becomes smaller, the horizontal movement speed of the spectacle lens 1 decreases and conversely the rotation speed increases. Then, as shown in FIG. 6, when the lowermost end P1 reaches the position of the apex of the cutter 2, the lens holder 3
Becomes almost horizontal, and the difference in the amount of magnetic detection between the magnetic sensors 4a and 4b disappears. As a result, the swing motor 19 is stopped and the spectacle lens 1 is cut at the maximum speed. 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 6, when the right side of the lens holder 3 is tilted, the spectacle lens 1 is moved leftward. The speed of horizontal movement and the speed of rotation follow the characteristics of FIG.

In this way, the spectacle lens 1 is processed from the start of grooving to one revolution, and the groove 1a shown in FIG. 3 is formed. FIG. 7 is a block diagram showing the main hardware configuration on the control side of the groove excavating machine 10 shown in FIG. 2 that performs such an operation. A control unit 30 composed of logic is provided in the main body 11 of the groove making machine 10. 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 controls the swing motor 1 according to the magnitude of the differential amplified signal and the positive / negative state, that is, the lens pedestal 3 is tilted in which direction.
The rotation direction and rotation speed of 9 are controlled.

Further, the relay circuit 32 includes 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 at a rotation speed according to the magnitude of the differential amplified signal. Driver 3
5 rotates the cutter motor 21 in response to a command from the control unit 30.

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 sends a position detection signal to the control unit 30.

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

FIG. 8 is a flow chart showing the control procedure of the groove digging process 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] The tilt of the lens holder 3 is detected based on the differential amplified signal. [S3] The swing motor 19 and the lens motor 20 are controlled according to the inclination of the lens holder 3 to control the horizontal movement speed and the rotation speed of the spectacle lens 1. [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 cradle 3 is detected by the magnetic sensors 4a and 4b, and the lens cradle 3 is moved according to the difference in the detected magnetic amount. Since the direction and the magnitude of the inclination are detected and the horizontal movement speed of the spectacle lens 1 is controlled based on these, the deviation of the cutting position between the spectacle lens 1 and the cutter 2 can be promptly corrected. Therefore, since the processing can always be performed in an appropriate state, the depth of the groove becomes uniform, and high-precision groove excavation processing becomes possible.

Further, in the present embodiment, the rotational speed of the spectacle lens 1 is also controlled according to the difference in the magnetic amount, so that the spectacle lens 1 and the cutter 2 can be quickly processed when the positions are proper. It is possible to prevent the groove from becoming too deep, and in an improper state, it is possible to continue cutting the same portion until it becomes the proper state. Therefore, a more uniform grooving process becomes possible.

In this embodiment, in FIG. 5, the characteristics of the horizontal movement speed and the rotation speed of the spectacle lens 1 are linear, but a curve or a combination of straight lines may be selected depending on the characteristics of the machine. It may have different characteristics.

Further, in the characteristic of FIG. 5, an example in which the characteristic of the line L2 is symmetrical with respect to the inclination O is shown. However, the area where the inclination is negative, that is, the lens holder 3 is inclined to the right side in FIG. In the portion, the line L2 may rise to the left or have a constant speed. This is because when the lens pedestal 3 is tilted to the left due to the rotational direction of the spectacle lens 1, the rotation of the spectacle lens 1 is delayed due to the influence on the processing accuracy (line L).
It is necessary that the gradient of 2 is steeper). However, when the lens pedestal 3 is tilted to the right, the influence on the processing accuracy is small and the return to the normal state is quick.

[0041]

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 object about the rotation axis, and the lens receiving is performed based on the detection state of the magnetic amount of the pair of magnetic sensors during the digging process on the peripheral edge of the spectacle lens by the cutter. It detects that the table is tilted and moves the bottom edge of the spectacle lens toward the apex of the cutter at a speed according to the detection state of the magnetic amount. Can be corrected promptly. Therefore, since the processing can always be performed in an appropriate state, the depth of the groove becomes uniform, and high-precision groove excavation processing becomes possible.

[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 an example of characteristics of horizontal movement speed and rotation speed of a spectacle lens.

FIG. 6 is a diagram showing a state where the lens pedestal has returned to a horizontal position.

FIG. 7 is a block diagram showing a main hardware configuration on the control side of the groove digging machine.

FIG. 8 is a flowchart showing a control procedure of grooving processing by the control unit.

FIG. 9 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. 10 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 Masahiko Samukawa 2-7-5 Nakaochiai, Shinjuku-ku, Tokyo Hoya Co., Ltd.

Claims (4)

[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. A cutter rotation control means, a lens rotation control means for controlling the lens rotation driving mechanism to rotate the spectacle lens, and the lens pedestal is tilted based on a detection state of a magnetic amount of the pair of magnetic sensors. A lens movement control unit that controls the lens movement mechanism so that the lowermost end of the spectacle lens moves toward the apex of the cutter at a speed according to the detection state of the magnetic amount, A grooving machine for spectacle lenses, which comprises: 2. The lens movement control means is configured to determine a movement speed of the spectacle lens according to a value of a difference in magnetic amount detected by the pair of magnetic sensors. The grooving machine for a spectacle lens according to claim 1. 3. The groove of the spectacle lens according to claim 1, wherein the lens rotation control means is configured to rotate the spectacle lens at a speed according to a detection state of the magnetic amount. Processing machine. 4. The lens rotation control means is configured to determine the rotation speed of the spectacle lens according to the value of the difference in the amount of magnetism detected by the pair of magnetic sensors. A grooving machine for spectacle lenses according to claim 3.