JPH08323602A - Grooving machine for spectacle lens - Google Patents

Abstract

PURPOSE: To facilitate maintenance for a cutter portion in a grooving machine for a spectacle lens for grooving a groove on the periphery of the spectacle lens. CONSTITUTION: When grooving working is finished to perform maintenance for a cutter 2, etc., at first, a lens retaining unit 13 is lifted, and then a case 181 is lifted by a handle 182. A cutter 2, a spindle 23, and a sponge 24a housed in a vessel 24, etc., are provided on the lower side of the case 181, and they are released by lifting the case 181 to facilitate maintenance such as the washing, fitting, and replacement of the cutter 2 or the sponge 24a.

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 particularly to an eyeglass lens for digging a groove for passing a nylon thread in the peripheral edge of an eyeglass lens for a rimless frame. Related to the 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. 11 is a schematic diagram showing the basic structure of a processing portion of a conventional groove excavating machine. 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 lower end portion thereof contacts the apex of the cutter 82 by its own weight. With such a setting, the cutter 82 rotates at high speed, for example, counterclockwise around the shaft 83. At this time,
The spectacle lens 81 also rotates counterclockwise at a low speed. As a result, a groove is formed on the peripheral edge of the spectacle lens 81.

A lens holder 84 is provided below the spectacle lens 81 so as to be rotatable about a shaft 84a. The lens pedestal 84 is the lowermost end 8 of the spectacle lens 81.
When 1a is displaced from the top of the cutter 82, the lowermost end 81
The groove is prevented from being formed shallowly by being pushed downward by a.

Further, as a processing mechanism when the displacement of the lowermost end portion 81a becomes large, shield rods 841 and 842 are attached to both ends of the lens receiving base 84, respectively. Further, optical sensors 85 and 86 are provided below both ends of the lens pedestal 84.

When the lowermost end 81a of the spectacle lens 81 is displaced to the left side of the cutter 82 in the drawing during the cutting process, the lowermost end 81a pushes the lens receiving base 84 downward. As a result, the lens pedestal 84 rotates counterclockwise about the shaft 84a, and the left shield rod 842 shields 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.

Incidentally, the cutter 82, the shaft 83, the lens pedestal 84, and the optical sensors 85 and 86 are provided in the cutter unit. FIG. 12 is a view showing the outer appearance of the cutter unit. The cutter unit 100 is covered with a case (protective member) 101. A lens pedestal 84 is provided at the center of the upper surface of the case 101. Case 10
The cutter 82, the shaft 83, the optical sensors 85 and 86 shown in FIG. Also, the case 101
A lens guide device 90 is provided outside the.
The guide arms 91 and 92 of the lens guide device 90 include
Guide rollers 91a and 92a are provided respectively, and both sides of the spectacle lens 81 are sandwiched by these guide rollers 91a and 92a, and the spectacle lens 81 is constantly processed during processing.
Hold so that it is right above the cutter 82.

[0009]

However, since the case 101 of the cutter unit 100 as described above is attached by screws (not shown), it is troublesome to attach and detach it. Therefore, even when cleaning the cutter 82 and the like, it takes time to remove the case 101,
The work was inefficient.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a grooving machine for a spectacle lens in which maintenance of a cutter portion is easy.

[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. And a lens holding mechanism portion that holds the spectacle lens rotatably by sandwiching the spectacle lens from both sides, and causes the peripheral edge of the spectacle lens to contact the cutter side by its own weight, and the bottom end portion of the spectacle lens is the cutter. When displaced from the apex of, the lens pedestal that is pushed and tilted at the lowermost end of the spectacle lens, and pivotally supports the lens pedestal, and a protective member that is openably and closably attached to protect the cutter, A grooving machine for spectacle lenses is provided.

[0012]

The lens holding mechanism holds the spectacle lens by sandwiching it from both sides and rotatably holding the spectacle lens by its own weight so as to bring the peripheral edge of the spectacle lens into contact with the cutter side. 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. The protection member pivotally supports the lens pedestal and is attached to be openable and closable so as to protect the cutter. Therefore, the cutter and its surroundings can be maintained by closing the protective member during processing to protect the cutter and opening the protective member during maintenance.

[0013]

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 such a 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 top view of the base unit 18. The case (protection member) 181 of the base unit 18 is the cutter 2
Is formed so as to cover from above. The case 181 is
It is rotatably attached to the attachment member 11a of the main body 11 via a shaft 11b. The lens pedestal 3 is rotatably attached to the center of the case 181 by a configuration described later. The lens pedestal 3 has a long hole X.
a is formed, and the apex portion of the cutter 2 projects upward from the elongated hole Xa.

A guide arm 17 is attached to the upper surface of the case 181. The guide arm 17 is
It has two arms 171 and 172. Arm 17
1, 172 are attached so as to be rotatable around shafts 174, 175, respectively. Also, the arms 171, 17
The two are connected by a shaft 173 and are adapted to rotate in conjunction with each other. The guide rollers 17 are respectively provided at the positions of the lens receiving bases 3 of the arms 171 and 172.
1a and 172a are attached at opposite positions.
The arms 171 and 172 are configured such that the guide rollers 171a and 172a are always attracted to each other by a spring mechanism or the like (not shown).

The tip portion 171b of the arm 171 is
Is longer than the arm 172, and by holding the tip portion 171b, the arms 171 and 172 can be opened.

Inside the case 181, a magnetic sensor and the like described later are provided. In addition, the shaft 11 of the case 181
A knob 182 for adjusting the formation position of the groove is attached to the one end surface on the b side. The knob 182 can adjust the position of the arm 17 in the left-right direction in cooperation with the shaft 173. As a result, the position of the spectacle lens 1 with respect to the blade of the cutter 2 in the lens thickness direction can be adjusted, and the position where the groove is formed is determined. Specifically, it is used to determine the positions of the front groove of the lens and the rear groove of the lens. For example, in the case of a strong prescription lens, a groove is formed on the front surface side of the lens so as to avoid the projection of the lens edge surface with respect to the wearer side. Further, due to the characteristics of the frame and the like, it is also used to maintain the aesthetic feeling as eyeglasses.

The case 181 can be lifted around the shaft 11b. Further, a height adjusting mechanism 183 for the cutter 2 is provided on the entire surface of the case 181, so that the depth of the groove can be adjusted.

FIG. 1 shows a case 181 of the base unit 18.
It is a figure which shows the state which lifted. When grooving is completed and maintenance of the cutter 2 and the like is performed, first, the lens holding unit 13 is lifted, and then the case 181 is lifted by holding the grip 182. Below the case 181, the cutter 2, the shaft 23, the sponge 24a housed in the container 24, and the like are provided. By lifting the case 181, these are released, and the cutter 2 and the sponge 24a are cleaned and attached. , Maintenance such as replacement can be easily performed.

FIG. 4 is a partial cross-sectional view showing the specific structure of the processed portion of the spectacle lens 1. The lens holder 15 a that holds the spectacle lens 1 is fixed to the shaft 15 and rotates together with the shaft 15. On the other hand, the lens holder 16
The a is rotatably attached to the shaft 16.
Therefore, in a state in which 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 is correspondingly rotated. 1 and the lens holder 16a rotate.

The held spectacle lens 1 has its lower end held between the guide rollers 171a and 172a of the arm portions 171 and 172 of the guide arm 17. 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 case 181 of the base unit 18, the lens pedestal 3 is pivotally supported by the shaft members 18a and 18b. 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. 5 is a view of the spectacle lens 1 as viewed from the front side to show the schematic structure of the lens holder 3. As described above, the lens pedestal 3 is axially supported by the case 181 of 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. Also,
Magnets 3a and 3b are provided on both ends of the lens holder 3, respectively.
Is attached.

Inside the base unit 18, a sensor unit 4 is attached below the lens receiving base 3. Magnets 3a and 3b are provided on both ends of the sensor unit 4, respectively.
Magnetic sensors (Hall elements) 4a, 4b at positions facing the
Is attached. 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.

By the way, the sensor unit 4 is mounted not inside the main body 11 but inside the movable base unit 18 because the magnets 3a and 3b and the magnetic sensor 3a and 3b are caused by changes in the motion mechanism of the base unit 18 itself. 4a, 4b
This is because the positional deviation between and is taken into consideration. This allows
The accuracy of the sensor can be stabilized.

Next, the operation of the grooving machine 10 of this embodiment having such a configuration will be described. At the start of the grooving process, the spectacle lens 1 is moved so that the lowermost end of the spectacle lens 1 reaches the apex 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 around the lens center O at a constant speed, as shown in FIG. Also,
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. 6 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. 7 is a diagram showing the characteristics of the horizontal movement speed and the rotation speed of the spectacle lens 1. Here, the case where the lens cradle 3 is tilted downward in FIG. 1 is a positive tilt, and the horizontal movement of the spectacle lens 1 in the right direction is a positive speed. 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 pedestal 3 is small, the horizontal speed of the spectacle lens 1 is 0, and conversely, the rotation speed becomes the maximum value.

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. 8, 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.

Contrary to FIGS. 6 and 8, 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 rotation speed follow the characteristics of FIG. 7.

In this way, the spectacle lens 1 is processed from the start of grooving to one revolution, and the groove 1a shown in FIG. 4 is formed. FIG. 9 shows a groove drilling machine 1 that performs such an operation.
It is a block diagram which shows the main hardware constitutions of the control side of 0. 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 outputs the differential amplified signal to the control unit 30.
And to 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. 10 is a flow chart showing the control procedure of the grooving 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 this embodiment, the case 181 of the base unit 18 shown in FIG. 4 is attached so as to be vertically rotatable, so that the cutter 2 and its surroundings can be easily maintained. .

Further, in this embodiment, the magnetism of the magnets 3a and 3b attached to the lens pedestal 3 is controlled by the magnetic sensors 4a and 4a.
4b, and the lens pedestal 3 detects the direction and size of the tilt in accordance with the difference in the detected magnetic amount, and the horizontal movement speed of the spectacle lens 1 is controlled based on these. It is possible to promptly correct the deviation between the cutting positions of 1 and the cutter 2. 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 this embodiment, the rotational speed of the spectacle lens 1 is also controlled according to the difference in the magnetic amount,
When the positions of the spectacle lens 1 and the cutter 2 are in a proper processing state, it is possible to perform quick processing so that the groove does not become too deep,
Further, 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, a linear characteristic of the horizontal moving speed and the rotating speed of the spectacle lens 1 is shown in FIG. 7, but a curve or a combination of a straight line and a curved line may be selected depending on the characteristics of the machine. It may have different characteristics.

[0046]

As described above, according to the present invention, the lens pedestal is pivotally supported, and the protection member for protecting the cutter is attached so as to be openable and closable. Therefore, during processing, the protection member is closed to protect the cutter. When performing maintenance, the cutter and its surroundings can be easily maintained by opening the protection member.

[Brief description of drawings]

FIG. 1 is a diagram showing a state where a case of a base unit is lifted.

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

FIG. 3 is a top view of a base unit.

FIG. 4 is a partial cross-sectional view showing a specific configuration of a processed portion of an eyeglass lens.

FIG. 5 is a view seen from the front side of the spectacle lens to show the schematic configuration of the lens cradle.

FIG. 6 is a diagram showing an example of a state in which a lens pedestal is tilted.

FIG. 7 is a diagram showing characteristics of horizontal movement speed and rotation speed of a spectacle lens.

FIG. 8 is a diagram showing a state where the lens pedestal has returned to a horizontal position.

FIG. 9 is a block diagram showing a main hardware configuration on the control side of the groove digging machine.

FIG. 10 is a flowchart showing a control procedure of grooving processing by the control unit.

FIG. 11 is a schematic view showing a basic configuration of a processing portion of a conventional groove excavating machine.

FIG. 12 is a diagram showing an appearance of a cutter unit.

[Explanation 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 Amplifiers 33, 34, 35 Driver 36 Switch board 181 Case (protective member) 182 Handle 11b Axis

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuaki Fujii 2-7-5 Nakaochiai, Shinjuku-ku, Tokyo Hoya Corporation

Claims (4)

[Claims] 1. A spectacle lens grooving machine for digging a groove on the rim of an spectacle lens, comprising a cutter for digging a groove on the rim of the spectacle lens, and enabling rotation while sandwiching the spectacle lens from both sides. While holding, a lens holding mechanism portion for bringing the peripheral edge of the spectacle lens into contact with the cutter side by its own weight, if the lowermost end portion of the spectacle lens is displaced from the apex of the cutter, at the lowermost end portion of the spectacle lens. An eyeglass lens grooving machine, comprising: a lens pedestal that is pushed and tilted; . 2. The groove digging machine for a spectacle lens according to claim 1, wherein the protective member is pivotally supported so as to be vertically rotatable. 3. The spectacle lens grooving machine according to claim 1, wherein the protective member is provided with a guide mechanism portion for sandwiching the vicinity of the cutting portion of the spectacle lens from both sides. . 4. The eyeglass lens grooving machine according to claim 1, wherein a sensor for detecting the inclination of the lens pedestal is attached to the protection member.