JPH01193159A - Lens peripheral edge machining device with lens edge thickness measuring unit - Google Patents

Abstract

PURPOSE:To form a smooth V member at the peripheral edge of the frame of spectacles by providing means for measuring a lens edge thickness in a position where the V member is formed according to a signal from a sensor member for detecting lens axis directional position, before starting a V member forming process. CONSTITUTION:A sensor member 8 is provided so as to measure lens axial direction position of both faces of lens from the peripheral edge thereof to a specified rate of the inside after completion of a rough lens grinding process. Next, based upon radius information after the lens retained by a head frame is roughly ground, the relative positions of the frame and the member 8 are controlled by means of a control unit 9. Also, based on a signal from the member 8, the lens after the process is used so as to measure the lens edge thickness after the completion of a V member forming process by means of measuring means 6, 7. It is possible to accurately measure the edge thickness of lens at a V member forming position, and to form a required smooth V member at the peripheral edge of the frame of spectacles.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a lens periphery processing machine for processing an unprocessed eyeglass lens for fitting into a frame.

(Prior Art) Conventionally, as described in Japanese Patent Application Laid-open No. 177256/1982, there is a birch that is equipped with a chucking mechanism that can hold and rotate a spectacle lens and can move in both the horizontal direction and the radial direction of the spectacle lens. a head frame configured, a drive device that is continuously connected to the head frame and causes the head frame to move horizontally, a drive device that is installed on the head frame and rotates a lens rotation axis provided with a chucking mechanism, and a main body frame. A drive device installed in the main body frame and attached to an end of the lens rotation shaft for moving up and down a lens shape, and a lens position detection device provided close to the grindstone. A lens peripheral edge processing machine is known. This device is described as an embodiment of a lens position detection device in which a detection section has a U-shaped contact.

To measure the edge thickness of the lens, insert the eyeglass lens after hulling is completed between both end faces of the contact, and move the eyeglass lens horizontally to bring both sides of the eyeglass lens into contact with the corresponding end faces of the contact. The contactor is rotated and this rotational displacement is detected by a photocoupler.

The edge thickness of the lens is measured at different rotational positions and is used as data for position control for forming the bevel.

(Problems to be Solved by the Invention) The contactor of one embodiment described in JP-A-58-177256 is sufficient for general eyeglass lenses, but it In the case of a special lens, such as a lens with a large curvature, there is a problem in that the curvature of the lens becomes a significant measurement error. In addition, the end surface of the lens may have nicks or chips due to the removal of rice hulls, and if this part comes into contact with the end surface of the contact,
This will result in a measurement error.

Therefore, the present invention aims at forming a bevel (in this specification, the word bevel is used not only to refer to a convex part for framing, but also to refer to a groove edge). An object of the present invention is to provide a lens edge processing machine equipped with a lens edge thickness measuring device that can accurately measure the lens edge thickness at a bevel forming position.

(Means for Solving the Problems) The present invention includes a head frame (1) that rotatably holds spectacle lenses, and a main body that supports the head frame movably in the radial and axial directions of the held lenses. A frame, a first control device (2, 3, 9) that controls the rotational position of the lens relative to the head frame (1), and a second control device that controls the position of the head frame relative to the main body frame! (4, 5, 6, 7, 9), a grinding device (24) that is provided on the main body frame and grinds the unprocessed eyeglass lens held on the head frame;
In the lens peripheral edge processing machine, sensor members (8, 30, 3132, 33
, 34a, 34b, 35a, 35b), and controlling the position of the head frame so that the sensor member measures both surfaces of the lens a predetermined amount inside from the periphery of the lens after hulling.

A lens peripheral edge processing machine comprising: a measuring means (6, 7, 9) for measuring the lens edge thickness after beveling before beveling based on a signal from the above; and an edge thickness measuring device having: It is.

(Function) According to the present invention, a sensor member is provided to measure the lens axial position of both surfaces of the lens at a predetermined distance inside from the lens periphery after hulling, and Based on the radius information, the measuring means controls the relative position of the head frame and the sensor member, and measures the lens edge thickness after beveling using the lens after hulling, so the lens edge thickness at the bevel forming position can be measured. Can be measured accurately.

(Embodiment) Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a partial perspective view of a lens peripheral processing machine centered on the head frame of Fig. 1, and Fig. 3 is a lens double-side position detection FIG. 4 is a flowchart of the control device of FIG. 1, and FIG. 5 is an explanatory diagram illustrating the operation of measuring edge thickness.

As shown in FIG. 2, the head frame 1 is rotatably (
It is slidably attached in the arrow A) and horizontal direction (axial direction) B.

A recess for holding the spectacle lens 21 is formed in the head frame l, and a lens holding shaft 22 and a lens holder shaft 23 are passed through this recess from both sides of the head frame 1.
One end of the lens holding shaft 22 is connected to a drive device (not shown) such as a motor that moves the twenty shaft 22 forward and backward in the axial direction, and the other end, although not shown in the figure, directly holds the spectacle lens 21. It is equipped with rubber etc. Lens holding shaft 2
The lens receiver 23 is also provided with rubber or the like (not shown) at one end of the shaft 23 to directly receive the spectacle lens 21.

The lens holding shaft 22 and the lens holder are rotated by a rotational drive control device (reference numeral 2 in FIG. 1) that includes a shaft 23, a transmission device such as a gear train, and a motor as a drive source. In order to convert the rotational position of the eyeglass lens into an absolute value, use an absolute position encoder for rotational position detection, an incremental encoder with an origin position detection function, or a combination of a rotational initial position detection sensor and a pulse motor, etc. A detection device (numeral 3 in FIG. 1) is used.

In addition, the main body frame (not shown) includes a grindstone 24 for grinding eyeglass lenses and a lens double-sided position detector (
In FIG. 2, only the contact member 30 is shown).

Returning to FIG. 1 again, the head frame l is moved vertically and vertically by a vertical movement control device 4 and a horizontal movement control device 5.
Moved horizontally. The vertical movement control device 4 rotates the head frame 1 around the support shaft 20, and the horizontal movement control device 5 rotates the head frame 1 around the support shaft 20.
It moves horizontally along the Vertical movement control device 4
and the horizontal movement control device 5 are, for example, disclosed in Japanese Patent Application Laid-Open No. 58-177.
The material described in Japanese Patent No. 256 can be used as is. Briefly, a movable member movable along the support shaft 20 is provided on the main body frame so as to be integrated with the head frame l in the horizontal direction and independently in the rotational direction, and this movable member is driven by a motor. The head frame l is moved horizontally by the device. and,
To prevent the head frame l from rotating due to its own weight,
The head frame 1 may be moved up and down by controlling the length of the wire connecting the moving member and the head frame 1 by adjusting the winding amount by a motor.

The horizontal position of the head frame 1 is detected by a horizontal position detection device 6, and the vertical position of the head frame 1 is detected by a vertical position detection device 7.

The horizontal position detection device 6 includes a rotary encoder that detects the rotation amount of the motor and the rotation angle from the origin, and a support shaft 20.
It is configured such that the horizontal absolute position can be detected using a linear encoder etc. provided between the main body frame and a movable member that can freely move along the vertical position detection device 7. A rotary encoder can be used to detect the amount of rotation of the motor and the angle of rotation from the origin.

The double-sided lens position detector 8 is shown in an enlarged view in FIG. be. The abutting member 30 is provided with abutting portions 30a and 30b that extend inward from the periphery of the spectacle lens 210 and abut on both sides. When no external force acts on the contact member 30, the light shielding plate 32 is connected to the photocoupler 31 (
Move the right spring so that the movement path of the light shielding plate 32 in the direction perpendicular to the plane of the paper is at the initial position where the light emitting element and the light receiving element are arranged with the light emitting element and the light receiving element sandwiched therebetween (in the plane of the paper). 34
a, the left spring 34-b is attached to the respective retainers 35a and 35b.
and the light shielding plate 32 are provided in a balanced manner so that biasing forces act in opposite directions.

The control device 9 outputs control signals to the rotational drive control device 2, the vertical movement control device 4, and the horizontal movement I control device 5, and outputs control signals to the rotational drive control device 2, the vertical movement control device 4, and the horizontal movement I control device 5, and outputs control signals to the rotational position detection device 3, the horizontal position detection device 6, the vertical position detection device 7, and both sides of the lens. A detection signal is input from the position detector 8.

First, the control device 9 inputs a control signal to the vertical movement control device 4 in response to a detection signal from the vertical position detection device 7 so as to raise the head frame 1 to the vertical reference position after the completion of hulling ( Step 40 in FIG. 4 (the same applies hereinafter), when the head frame 1 rises to the reference position, the control device 9 detects the detection from the horizontal position detection device 6 so as to move the head frame 1 to the horizontal reference position. Input a control signal to the horizontal movement control device 5 according to the signal (
Step 41), the horizontal movement control device 5 is caused to horizontally move the head frame l according to the detection signal from the horizontal position detection device 6 so that the spectacle lens 21 is positioned above the contact member 30 (in the horizontal direction The amount of horizontal movement from the reference position to the upper position of the abutting member 30 is known), step 42) sends a signal for lowering the head frame 1 to the vertical movement control device 4, and the eyeglass lens 21 is moved as shown in FIG. As shown in the middle state, the signal from the vertical position detection device 7 does not change even though the contact member 30 is in contact with the upper end and sends a descending signal to the vertical movement control device 4. With the state, the control device 9 controls the spectacle lens 2.
1 has abutted against the upper end of the abutting member 30 (Step 43), the radius of the eyeglass lens 21 is measured based on the detection signal from the vertical position detecting device 7 at that time, and the first The amount of descent of the head frame 1 at which the abutting portion 30a abuts the end face position of the eyeglass lens 21 after the beveling process is completed is calculated (step 44).

The control device 9 sends a signal to the vertical movement control device 4 to raise the head frame 1 to the reference position, and then sends a signal to the horizontal movement control device 5 to move the head frame 1 in one direction by a predetermined amount. horizontally moving (step 45);
Then, it causes the vertical movement control device 4 to lower the head frame 1 based on the amount of descent calculated in step 44 (step 46), and sends a signal to the horizontal movement control device 4 to move the head frame 1 to the other side (step 47), Now, in FIG. 3, if one side of the horizontal movement is from right to left and the other is from left to right, the spectacle lens 21 will move as shown in the abutment member 3 of FIG.
The eyeglass lens 21 is located at the position shown on the left side of 0.
When further moves to the other side, the abutment member 30 moves to the center of rotation 3
Rotate clockwise around 3. At this time, the position of the surface of the eyeglass lens 21 that the contact portion 30a contacts is precisely at the height of the hem of the bevel (although it depends on the shape of the grindstone)
- In boat fishing, areas other than the mountain portions have slopes as shown by broken lines), and as a result, the photocoupler 31 guides light and outputs a detection signal. When the detection signal is output (step 48), the control device 9 detects the horizontal position H3 from the horizontal position detection device 6.
is read (step 49).

After that, the control device 9 sends a signal to the horizontal movement control device 5 to move the head frame 1 in one direction by a predetermined amount, and sends a signal to the vertical movement control device 4 to raise the head frame 1 to the reference position. urge (step 50);
Then, the control device 9 sends a signal to the horizontal movement control device 5 to move the head frame 1 by a predetermined amount to the other side (step 51), and lowers the head frame 1 based on the lowering amount calculated in step 44. A signal is sent to the vertical movement control device 4 to cause the vertical movement to be performed (step 52).

As can be seen from FIG. 3, the contact member 30 in FIG.
Since the second contact portion 30b is provided above the first contact portion 30a that contacts the eyeglass lens 21 by the thickness d of the horizontal convex portion, the amount of descent of the head frame 1 is determined by the step 46. is set above the lowered position by a value d (step 52).

Then, the control device 9 sends a signal to the horizontal movement control device 5 to horizontally move the head frame 1 in one direction (step 53), and when a detection signal is output by the photocoupler 31 guiding light (step 53). 54), read the horizontal position H8 from the horizontal position detection device 6 (step 55)
).

Note that the center of rotation of the contact member 30 is set so that the detection signal obtained when the spectacle lens 21 contacts the contact portion 30a and the detection signal obtained when the contact portion 30b is obtained with the same sensitivity are obtained. The distances between the contact portion 33 and the contact portion 30a130b are set to be equal.

Since the horizontal distance l between the contact parts 30a and 30b of the contact member 30 is known, the control device 9 calculates the edge thickness of the eyeglass lens after beveling using H, -H, -ffi (step 56).

The above explanation takes the edge thickness measurement at one radius as an example; in an actual lens, the edge thickness changes over the entire circumference, so the control device 9 determines whether the entire circumference has been completed or not. If the complete rotation has not been completed, move the head frame a predetermined amount to the other side and raise it to the reference position (step 57).
8) After that, a control signal is sent to the rotational drive control device 2 to rotate it by a predetermined amount, and the process returns to step 59) and step 42. In this way, the flow shown in FIG. 4 described above is repeated every predetermined amount of rotation of the eyeglass lens 21, and after obtaining edge thickness data, the curve position of the bevel curve is adjusted to the horizontal position of the head frame 1 relative to the rotational position of the eyeglass lens 21. Determine and store it as data.

Since this stored data is based on the edge thickness data when the bevel was actually formed, it is extremely accurate data.

The movement of the spectacle lens 21 according to the above flowchart is visually shown in FIGS. 5(A) to 5(C).
The dashed line is the path of movement of the center of the spectacle lens (center of support-axis 2), the arrow indicates the direction of movement, and the symbols attached to the dashed line indicate the steps of the corresponding flowchart. That is, for example, in FIG. 5(a), S4
° is the spectacle lens 21 in step 40 of FIG.
It shows the movement.

FIG. 5(a) shows the step of measuring the radius of the eyeglass lens 21, FIG. 5(b) shows the step of measuring the horizontal position of one surface of the eyeglass lens 21, and FIG. 5(c) shows the step of measuring the radius of the eyeglass lens 21. The steps of measuring the horizontal position of the other surface of the lens 21 are shown respectively.

In addition, in the above embodiment, the head frame l is connected to the support shaft 2.
0 to move the eyeglass lens 21 up and down, but the head frame l is moved only in a horizontal plane by a moving device such as a cross-moving stage used in optical equipment. In the above embodiment, the lowering of the head frame 1 is caused by the action of gravity, but the lowering of the head frame 1 may be guided by a biasing force such as a spring.

Furthermore, the shape of the abutting member 30 is such that the first abutting portion 3
The heights of the second abutting portion 30b and the second abutting portion 30b can be made the same as shown in FIG. No need to change.

(Effects of the Invention) As described above, according to the present invention, since the lens edge thickness at the bevel forming position can be accurately measured before bevel processing, a desired bevel can be formed neatly.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a partial perspective view of a lens peripheral processing machine centered on the head frame of FIG. 1, and FIG. 3 is a side view of a lens double-sided position detector. 4
The figure is a flowchart of the control device in Figure 1, and Figure 5 (A).
, (B) and (C) are explanatory diagrams for explaining the operation for measuring edge thickness, and FIG. 6 is a diagram showing another shape of the abutting member. (Explanation of symbols of main parts) 8... Lens double-sided position detector, 9... Control device,
30...Abutment member, 31...Photocabra. Applicant Nippon Kogaku Kogyo Co., Ltd.

Claims (1)

[Claims] A head frame that rotatably holds spectacle lenses;
a main body frame that supports the head frame so as to be movable in the radial and axial directions of the lens held thereon; and a first body frame that controls the rotational position of the lens with respect to the head frame.
A lens comprising: a control device; a second control device that controls the position of the head frame with respect to the main body frame; and a grinding device that is provided on the main body frame and that grinds a raw eyeglass lens held by the head frame. In the peripheral edge processing machine, a sensor member is provided on the main body frame and detects the axial position of both surfaces of the lens; A measuring means for controlling the position of the head frame and measuring the lens edge thickness after beveling before beveling based on the signal from the sensor member; and an edge thickness measuring device comprising: Lens peripheral processing machine.