JP2918657B2 - Eyeglass lens grinding machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a spectacle lens grinding machine (a balling machine).

[Prior Art] When wearing spectacles, it is common to match the distance between the optical centers of the spectacle lenses with the interpupillary distance (PD).
Therefore, usually, the distance between the geometric centers of the spectacle frames (FPD) is obtained, and the shift amount (the amount of movement of the optical center of the lens from the geometric center) is calculated from this and the PD value.

However, conventionally, the shift amount during lens processing is
The calculation was performed assuming that both lenses were flat.

[Problems to be Solved by the Invention] However, there is a defect that an error occurs because factors such as the inclination of the spectacle frame, the thickness of the lens, and the lens curve are actually added. This was particularly noticeable on large, sled frames. In order to reduce this error, the operator has to make corrections based on intuition, but there is a disadvantage that sufficient accuracy cannot be obtained.

The present invention has been devised in view of the above-described drawbacks, and does not depend on the shape of a frame or a lens so that an error does not occur between the optical center distance of a processed lens and a designated PD value. It is a technical object to provide a spectacle lens grinding machine capable of calculating a shift amount in advance.

[Means for Solving the Problems] To achieve the above objects, the present invention is characterized by having the following configuration.

(1) A spectacle lens grinding machine that lays out a lens to be processed with respect to a lens frame based on frame information, a geometric center distance, and a pupil distance of the lens frame and processes the lens based on the layout. Three-dimensional frame information input means for obtaining three-dimensional frame information in the radial direction of the lens and a direction (Z direction) orthogonal thereto, lens shape measuring means for measuring the shape of the lens to be processed, and three-dimensional Frame information, obtained based on the shape of the lens to be processed,
The optical axis is parallel to the Z direction based on the relationship between the XZ plane shape of the lens to be processed after framing (however, the direction of the interpupillary distance is the X direction) and the geometric center distance and the interpupillary distance. Calculating means for calculating the amount of shift of the lens to be processed in the X direction so that the optical center thereof is located at a position corresponding to the interpupillary distance.

(2) In the spectacle lens grinding machine according to (1), the calculating means includes a lens front surface curve obtained by the lens shape measuring means and a nose side and an ear side determined based on a measurement result of the lens shape measuring means. A step of obtaining the optical axis of the lens to be processed after the framing based on the bevel position.

(3) In the spectacle lens grinding machine of (1), the calculating means converts the lens front curve obtained by the lens shape measuring means and the nose side / ear side position information based on the three-dimensional frame information of the lens frame. A step of obtaining the optical axis of the lens to be processed after the framing processing, thereby obtaining an approximate shift amount in the X direction of the lens to be processed whose optical axis is not parallel to the Z direction.

Embodiment An embodiment of the present invention will be described below in detail with reference to the drawings.

(1) Overall Configuration of Lens Grinding Apparatus FIG. 1 is a perspective view showing the overall configuration of a lens grinding apparatus according to the present invention.

Reference numeral 1 denotes a base of the apparatus, on which components constituting the lens grinding apparatus are arranged.

Reference numeral 2 denotes a lens frame and template shape measuring device which is built in the upper part of the device.

A display unit 3 that displays measurement results, calculation results, and the like in characters or graphics and an input unit 4 that inputs data and instructs the apparatus are arranged in front of the display unit 3.

At the front of the apparatus, there is a lens shape measuring device 5 for measuring the virtual edge thickness and the like of the unprocessed lens.

Numeral 6 denotes a lens grinding unit, and a grindstone 60 composed of a rough grindstone 60a for a glass lens and a rough grindstone 60b for a plastic is rotatably mounted on a rotating shaft 61 fixed to a base 1 with a band 62.

A pulley 63 is attached to the end of the rotating shaft 61,
Since the pulley 63 is connected to the pulley 66 attached to the rotating shaft of the AC motor 65 via the belt 64, when the motor 65 rotates, the grindstone 60 rotates.

 Reference numeral 7 denotes a carriage unit, and reference numeral 700 denotes a carriage.

Reference numeral 8 denotes a beveled portion for performing beveling and flattening.

(2) Lens Frame Shape Measuring Unit (Tracer) (a) Configuration The configuration of the lens frame shape measuring unit 2 will be described with reference to FIGS.

FIG. 2 is a perspective view showing a lens frame shape measuring unit according to the present embodiment. The main unit is incorporated as a main body, and has two main parts, namely a frame holding unit 20 for holding the frame.
00 and a measuring unit 2500 for digitally measuring the shape of the lens frame of the frame.

Frame Holder The structure of the frame holder 2000 is shown in FIGS. 3-1 to 3-6.
Shown in the figure.

In FIG. 3A showing the frame holding unit 2000, the average geometric center position of the lens frame when the spectacle frame is set in the frame holding unit 2000 is determined as the reference points OR and OL, and a straight line passing through these two points is defined. Set it as the reference line. A plane at a specific height from the surface of the housing 2001 of the frame holding unit 2000 is defined as a measurement reference plane.

Upper slider part 2100, lower slider part 2200 are housing 2001
It is slidably mounted on a guide rail 2005 having a hexagonal cross-sectional shape that is rotatably supported on a guide shaft 2002 mounted on the top and a housing 2001, and is rotatable on the housing 2001. The upper side of the wire 2004 laid over the pulleys 2003a and 2003b attached to the upper side is fixed to a pin 2150 planted in the upper slider portion 2100, and the lower side of the wire 2004 is a pin planted in the lower slider portion 2200. It is fixed to 2250 and can slide symmetrically opposite to the reference line.

A gear 2011 is attached to a rotating shaft of the clamp motor 2010 mounted on the housing 2001, and meshes with a gear 2006 formed at one end of the guide shaft 2005 via the idle gear 2015. Is transmitted to the guide shaft 2005.

On the back side of the housing 2001, a shaft 2020 is rotatably supported, and a pin 2021 is implanted at one end of the shaft 2020.
Is made to abut against a concave portion 2013 of a cam 2012 formed at an intermediate portion of the gear 2011 by a leaf spring 2024 attached to the housing 2001. The brake rubber 2023 is attached to the brake arm 2022 attached to the other end of the shaft 2020, and the housing
It emerges from the hole 2025 in 2001 on the surface.

When the cam 2012 is rotated by the clamp motor 2010,
The pin 2021 that was in contact with the concave part 2013 is the convex part 2014 of the cam 2012
2020, the shaft 2020 is rotated, and the brake rubber 2023 adhered to the brake arm 2022 comes into contact with the back surface of the upper slider portion 2100.

The upper center clamp 2110 is slidably mounted on shafts 2102 and 2103 attached to the base 2101 of the upper slider portion 2100. Similarly, the light clamp 2120 is
Left clamp 2130 is slidably mounted on shafts 2106 and 2107 on 4 and 2105, respectively.

The upper center clamp 2110 has shafts 2111a, 2111b, 2111
c, 2111d are rotatably supported, and shafts 2111a, 2111b
, Gears 2112a and 2112b to which one ends of arms 2113a and 2113b are fixed, respectively, are rotatably mounted, and clamp pins 2114a and 2114b are mounted to the other ends of the arms 2113a and 2113b.

Gears 2112c and 2112d each having one end of an arm 2113c or 2113d fixed thereto are rotatably attached to the shafts 2111c and 2111d, and clamp pins 2114c and 2114d are received at the other ends of the arms 2113c and 2113d. ing.

Further, another gear 2115c, 2115d is rotatably attached to the shaft 2111c, 2111d, and the torsion coil spring 2116
The gears 2112c and 2112d are integrally connected via the gears c and 2116d.

In these configurations, gears 2112a and 2112c, gear 2112
b and 2112d, gears 2115c and 2115d mesh with each other, and gear 21
By rotating 15d, clamp pins 2114a and 2114c, 211
4b and 2114d are arranged so as to rotate symmetrically facing each other with respect to the measurement reference plane.

At the left and right ends of the upper center clamp 2110, frame contacts 2117a and 2117b are attached perpendicular to the measurement reference plane in the vicinity of the clamp pins 2114a, 2114c and 2114b and 2114d, and a knob 2118 is formed on the upper part. Have been.

Holes 2119a and 2119b formed in the base 2101 are arranged on the left and right of the upper center clamp 2110.

Shafts 2121a and 2121b are supported by the light clamp 2120, and a gear 2122a to which one end of an arm 2123a is fixed is rotatably attached to the shaft 2121a.
A clamp pin 2124a is attached to the other end of 3a.

The gear 21 to which one end of the arm 2123b is fixed is attached to the shaft 2121b.
22b is rotatably attached, and a clamp pin 2124 is attached to the other end of the arm 2123b.

Further, another gear 2125 is rotatably attached to the shaft 2121b, and the gear 2125 is connected via a torsion coil spring 2126.
Connected to 22b.

In these configurations, the gears 2122a and 2122b are in mesh with each other, and the rotation of the gear 2125 causes the clamp pin 2224 to rotate.
a and 2224b are arranged to rotate symmetrically facing the measurement reference plane.

Further, a frame contact 2127 is attached to the light clamp 2120 so as to be close to the clamp pins 2124a and 2124b and perpendicular to the measurement reference plane, and a knob 2128 is formed on an upper portion.

Shafts 2131a and 2131b are pivotally supported by the left clamp 2130, and a gear 2132a (not shown) to which one end of an arm 2133a is fixed is rotatably attached to the shaft 2131a, and is attached to the other end of the arm 2133a. Has a clamp pin 2134a attached.

A gear 2132b (not shown) to which one end of an arm 2133b is fixed is rotatably attached to the shaft 2131b, and a clamp pin 2134b is attached to the other end of the arm 2133b.

Further, another gear 2135 (not shown) is rotatably attached to the shaft 2131b, and is integrally connected to the gear 2132b via a torsion coil spring 2136 (not shown).

In these configurations, the gears 2132a and 2132b are in mesh with each other, and the rotation of the gear 2135 causes the clamp pin 2134 to rotate.
The a and 2134b are arranged to rotate symmetrically facing the measurement reference plane.

Further, a frame contact 2137 is attached to the left clamp 2130 so as to be close to the clamp pins 2134a and 2134b and perpendicular to the measurement reference plane, and a knob 2138 is formed at an upper portion.

A gear 2142a and a pulley 2143a are integrally attached to a shaft 2141a rotatably supported by a base 2101 of the upper slider portion 2100, and the gear 2142a is engaged with a gear 2115d. Similarly, gears 2142b and 2142c and pulleys 2143b and 2143c are integrally mounted on a shaft 2141b and a shaft 2141c (not shown), respectively.The gear 2142b is a gear 2125, and the gear 2142c is a gear.
Meshes with 2135.

Also, the gears 2142a, 2142b, 2142c are sufficiently long in the axial direction, and the gears 2115d, 212 are always within the sliding range of the upper center clamp 2110, the right clamp 2120, and the left clamp 2130.
Can engage with 5,2135.

A hexagonal shaft hole of the holder 2144 rotatably supported by the base 2101 of the upper slider portion 2100 is engaged with the guide rail 2005, and prevents the holder 2144 from rotating around the guide rail 2005.

 A pulley 2145 is formed in the holder 2144.

The wire 2146 having one end fixed to the pulley 2145 is wound around the pulley 2143c and the pulley 2143a on the way, and the other end is hung on a pin 2148 planted on the base 2101 via a spring 2147.

The wire 2149 is hooked between the pulley 2143a and the pulley 2143b.

From the above configuration of the upper slider portion 2100, when the rotation of the clamp motor 2010 is transmitted to the guide shaft 2005 and the pulley 2145 formed on the holder 2144 rotates, the gears 2142a, 2142b, and 2142c are moved through the wires 2146 and 2149. Rotate all clamp pins 2114 and a2114c, 2114b and 2114
d, 2124a and 2124b, and 2134a and 2134b rotate symmetrically facing the measurement reference plane.

The lower sensor clamp 2210 attached to the base 2201 of the lower slider portion 2200 has shafts 2211a, 2211b, 2211c,
A gear 2212a, 2211 having one end of an arm 2213a, 2213b fixed to the shaft 2211a, 2211b, respectively.
2b is rotatably mounted and arms 2213a, 221
Clamp pins 2214a and 2214b are attached to the other end of 3b. The shafts 2211c and 2211d have arms 2213c and 2213c respectively.
Gears 2212c and 2212d to which one ends of 213d are fixed are rotatably mounted, and clamp pins 2214c and 2214d are mounted to the other ends of the arms 2213c and 2213d.

Further, other gears 2215c, 2215d are rotatably attached to the shafts 2211c, 2211d, and are integrally connected to the gears 2212c, 2212d via torsion coil springs 2216c, 2216d (not shown).

This torsion coil spring 2116c, d, 2126, 2136, 2216c, d
Is mounted so as not to damage the frame when clamping the spectacle frame.

In these configurations, gears 2212a and 2212c, gear 2212
b and 2212d, gears 2215c and 2215d mesh with each other,
By rotating 15c, clamp pins 2214a and 2214c, 221
4b and 2214d are arranged so as to rotate symmetrically facing each other with respect to the measurement reference plane.

In addition, a frame pad 2219a having mounting holes 2220a and 2220a and a frame pad 2219b having mounting holes 2220b and 2220b are formed in the base 2201 in parallel with the reference line.

Holder pivotally supported by lower slider part 2201
The hexagonal shaft hole of 2221 is engaged with the guide rail 2005 to prevent the relative rotation of the holder 2221 around the guide rail 2005.

 A pulley 2222 is formed on the holder 2221.

The wire 2223 having one end fixed to the pulley 2222 is fixed to the pulley 2218 formed on the gear 2215c at the other end.

Arm 2230 formed on base 2201 of lower slider section 2200
Gear 2232 rotatably supported by a pin 2231 implanted in
A pulley 2233 is formed at the lower part of the
The wire 2234 fixed to the pulley 2217 formed on a
It is wound on a pulley 2233 on the way, and the other end is armed through a spring 2235.
It is hung on a pin 2236 planted at 2230.

A potentiometer 2237 is attached to the arm 2230, and a gear 2238 is attached to the rotating shaft of the potentiometer 2237.
Is fixed.

Gear 2238 is in mesh with gear 2232 and is
The amount of movement of 2214a can be transmitted to potentiometer 2237 via wire 2234.

The shaft 2201 is attached to the base 2201 of the lower slider 2200.
a, 2241b is attached, left slider 2242a,
A right slider 2242b is slidably mounted.

At the end of an arm 2243a extending from the left slider 2242a, a cylindrical right frame holder 2244a is attached perpendicular to the measurement reference plane, and at the end of an arm 2243b extending from the right slider 2242b, a cylindrical right frame holder 2244b. Are mounted perpendicular to the measurement reference plane.

Pulley 2245 rotatably mounted on base 2201
a, the lower side of the wire 2246 bridged over the 2245b is fixed to the pin 2247a planted on the left slider 2242a, and the upper side of the wire 2246 is the pin 2 planted on the right slider 2242b.
247b, and can slide symmetrically with respect to the center lines of OR and OL. Both ends of the spring 2248 are fixed to the left slider 2242a and the right slider 2242b, and always face the center. Being pulled in the direction.

In the present embodiment, the left slider 22 is
Although 42a and right slider 2242b are always pulled in the direction toward the center, it is not necessarily limited to this configuration.

For example, the position of the left slider 2242a and the right slider 2242b may be controlled by driving the pulley 2245a or 2245b by a motor (not shown).

A drum 2261 is rotatably supported on the housing 2001, and one end of a constant torque spring 2262 wound around the drum 2261 is fixed to an arm 2240 formed on a base 2201 of the lower slider 2200. The upper slider section 2100 and the lower slider 2200 are always pulled in the direction toward the center.

Measuring Unit Next, the configuration of the measuring unit 2500 will be described with reference to FIG. 4th
FIG. 1 is a plan view of the measuring unit, and FIGS. 4-2, 4-3,
FIG. 4-4 is a sectional view taken along line CC of FIG. 4-1 and FIG.
It is D sectional drawing and EE sectional drawing.

Shaft holes 2502a, 2502b, 2502c are formed in the movable base 2501, and the shafts 2503a, 2503b attached to the housing 2001 are formed.
Slidably supported by Further, a lever 2504 is implanted in the drive base 2501, and the movable base 2501 is slid by the lever 2504, so that the rotating base 2501 is rotated.
The rotation center of 2505 moves to the position of OR, OL of the frame holding unit 2000A. A rotatable base 2505 on which a pulley 2506 is formed is rotatably supported on the movable base 2501. A belt 2509 is stretched between a pulley 2506 and a pulley 2508 attached to a rotating shaft of a pulse motor 2507 attached to a movable base 2501.
The rotation of 2507 is transmitted to rotation base 2505.

As shown in FIG. 4-3, four rails 2510a, 2510b, 2510c, 2510d are mounted on the rotating base 2505, and the tracing stylus 2520 is slidably mounted on the rails 2510a, 2510b. Have been. A shaft hole 2521 is formed vertically in the tracing stylus part 2520.
22 has been inserted.

A ball bearing 2523 is interposed between the tracing stylus shaft 2522 and the shaft hole 2521, thereby smoothing the vertical movement and rotation of the tracing stylus shaft 2522. An arm 2524 is attached to the upper end of the tracing stylus shaft 2522.On the upper portion of the arm 2524, a solo van ball-shaped bevel tracing stylus 2525 abutting on the bevel groove of the lens frame is rotatably supported. .

In the present embodiment, the bevel measuring element 25
25 is rotatably supported, but is not limited to this. The bevel tracing stylus 2525 does not have to rotate, and the shape is a disk shape if the tip is a solobang ball. It does not have to be.

Below the arm 2524, a cylindrical template measuring roller 2526 that contacts the edge of the template is rotatably supported. The outer peripheral surfaces of the bevel tracing stylus 2525 and the template measuring roller 2526 are configured to be located on the center line of the tracing stylus shaft 2522.

Below the stylus shaft 2522, a pin 2528 is implanted in a ring 2527 rotatably attached to the stylus shaft 2522,
The movement of the pin 2528 in the rotation direction is restricted by the elongated hole 2529 formed in the tracing stylus part 2520. The movable portion of the potentiometer 2530 of the tracing stylus 2520 is attached to the tip of the pin 2528, and the amount of vertical movement of the tracing stylus shaft 2522 is detected by the potentiometer 2530.

A roller 2531 is rotatably supported at the lower end of the tracing stylus shaft 2522.

A pin 2533 is implanted in the tracing stylus part 2520, and a pulley 2535 is attached to a shaft of a potentiometer 2534 attached to the rotary base 2505. Rotating base 2505
Pulleys 2536a and 2536b are rotatably supported on the shaft, and a wire 2537 fixed to a pin 2533 is connected to the pulleys 2536a and 2536b.
And wound on a pulley 2535. As described above, the moving amount of the tracing stylus 2520 is detected by the potentiometer 2534.

Further, a constant torque spring 2540 that constantly pulls the tracing stylus part 2520 toward the distal end of the arm 2524 is attached to the rotating base 2505, and is attached to a drum 2541 that is rotatably supported by the rotating base 2505. One end is fixed to a pin 2542 implanted in the tracing stylus part 2520.

A tracing stylus drive unit 2550 is slidably mounted on rails 2510c and 2510d on a rotating base 2505. Pin 2551 is implanted in the probe drive 2550, and the rotation base 25
Pulley 2553 is attached to the rotation axis of motor 2552 attached to 05.
Is attached. Pulley 2554 on rotating base 2505
a, 2554b is rotatably supported, and a wire 2555 fixed to the pin 2551 is hung on the pulleys 2554a, 2554b,
Wound on pulley 2553. As a result, the rotation of the motor 2552 is transmitted to the tracing stylus drive unit 2550.

The tracing stylus drive unit 2550 is in contact with the tracing stylus unit 2520 that is pulled toward the tracing stylus driving unit 2550 by the constant torque spring 2540. It can be moved to a position.

Further, the tracing stylus drive unit 2550 has an arm 2557 at one end that comes into contact with a roller 2531 rotatably supported at the lower end of the tracing stylus shaft 2522, and an arm 2558 that rotatably supports the roller 2559 at the other end. The attached shaft 2556 is rotatably supported. Roller 25
One end of the torsion coil spring 2566 is attached to the arm 25 in a direction in which the fixed guide plate 2560 is fixed to the rotating base 2505.
The other end is fixed to the tracing stylus driving unit 2550 at the other end. When the tracing stylus driving unit 2550 moves, the roller 2529 moves up and down along the guide plate 2560.

The shaft 2556 rotates by the up and down movement of the roller 2559, and the arm 2557 fixed to the shaft 2556 also rotates about the shaft 2556.
Raise and lower 22. A shaft 2563 is rotatably attached to the rotation base 2505, and a movable guide plate 2561 is fixed to the shaft 2563. One end of the sliding shaft of the solenoid 2564 attached to the rotating base 2505 is a movable guide plate 2562
It is attached to. One end of the spring 2565 is hung on the rotation base 2505, and the other end is hung on the movable guide plate 2562,
Normally, it is pulled to a position where the roller 2559 and the guide portion of the movable guide plate 2562 do not abut. When the movable guide plate 2562 is pulled up by the action of the solenoid 2564, the guide portion of the movable guide plate 2562 moves to a position parallel to the fixed guide plate 2560, and
2559 abuts the guide and can move along guide 2562.

(B) Operation Next, the operation of the above-described lens frame shape measuring device 2 will be described with reference to FIGS. 2 to 6-3.

Lens Frame Shape Measurement First, the operation when measuring the eyeglass frame will be described.

Select either left or right of the lens frame of the glasses frame 600 to measure, and the lever 2504 fixed to the movable base 2501
To move the measuring unit 2500 to the side to be measured.

The frame holding unit of the present apparatus can hold the frame horizontally and one eye, and the operation of the horizontal holding will be described below.

Pull the knob 2118 formed on the upper center clamp 2110 of the upper slider 2100 toward you, and
20, By pushing the knobs 2128 and 2138 of the left clamp 2130 into the back, the upper center clamp 2110
a, b and the clamp pins 2114a, b, c, d can be used, and the frame
7. The clamp pins 2124a and 2124b, the frame contact 2137 of the left clamp 2130, and the clamp pins 2134a and 2134 are stored. At this time, each clamp pin is in the most opened state.

Next, the left frame presser 2244a and the right frame presser 2244b
Open left and right, and at the same time, pull the lower slider 2200 forward to widen the gap with the upper slider 2100 sufficiently. After the front portion of the glasses frame is positioned between the clamp pins 2114a, c and 2114b, d of the upper slider portion 2100 and is brought into contact with the frame contacts 2117a, 2b, the upper slider portion 2100
And the distance between the lower slider portion 2200 is reduced, and the lower portion of the frame is clamped by the clamp pins 2214a, 2214a, 2214a, and 221 of the lower slider portion 2200.
4b, d, and abut against frame contacts 2219a, b. Thereafter, the left frame presser 2244a and the right frame presser 2244b are narrowed, and are brought into contact with the side of the glasses frame.

In the present embodiment, the upper slider section 2100 and the lower slider section 2200, the left frame presser 2244a and the right frame presser 224
4b, constant centrifugal force is always applied by the constant torque spring 2262 and the spring 2248, and the upper slider part 2100 and the lower slider part 2200, the left frame presser 2244a and the right frame presser 2244b
, The center position of the frame in the left-right direction is held at the middle point of OROL.

When the trace switch of the input unit 4 described later is pressed with the frame set as described above, the brake rubber 2023 is moved by the action of the
Abut on the back of 00, upper slider 2100 and wire 2004
, The lower slider portion 2200 is fixed, and then the clamp pins 2114a and c, 2114b and d of the upper slider portion 2100, the clamp pins 2214a and c, 2214b and d of the lower slider portion 2200 are fixed.
Closes and abuts the frame. Furthermore, when the clamp motor 2010 is rotated, the torsion coil springs 2216c, 2216d,
Clamp pins 2114a and 2214d, 2214b and d, 2214a and c, and 2214b and d are strongly pressed against the frame by the action of 2216c and 2216d to fix the frame.

In the case of holding one eye, for example, in the case of holding the right eye, the center clamp 2110 of the upper slider section 2100 and the light clamp
Pull out 2120 and clamp pin 2114b and d of upper center clamp 2110 and clamp pin 2124 of light clamp 2120
a, b and lower slider 2200, lower center clamp 2210
The right side of the frame is fixed by the clamp pins 2214b and 2214d. In the case of holding the left eye, the left clamp 2130 is used.

In FIGS. 5-1 and 5-2, the probe drive unit 25
The 20 rollers 2559 are at the reference position O, rotate the pulse motor 2507 by a predetermined angle, and rotate the rotation base 2505 in a direction in which the moving direction of the tracing stylus drive unit 2550 is perpendicular to the reference line.

Next, when the guide portion of the movable guide plate 2562 is moved to a predetermined position by the solenoid 2564 and the tracing stylus drive portion 2550 is moved in the direction of the lower slider 2200, the roller 2559 is moved from the guide portion 2560b of the fixed guide plate 2560 to the movable guide. Moved to the plate 2562b, the stylus shaft 2522 is pushed up by the arm 2557,
The bevel tracing stylus 2525 is kept at the height of the measurement reference plane.

Further, when the tracing stylus drive unit 2550 moves, the bevel tracing stylus 2525 is inserted into the bevel groove of the lens frame, and the tracing stylus unit 2520
Stops moving, and the tracing stylus drive unit 2550 moves to the FRL and stops.

Subsequently, the pulse motor 2507 is rotated every predetermined number of unit rotation pulses. At this time, the tracing stylus part 2520 moves on the guide shafts 2510a and 2510b according to the moving radius of the lens frame, the amount of movement is read by the potentiometer 2534, and the tracing stylus 2522 moves up and down according to the curve of the lens frame. The volume is read by potentiometer 2530. From the rotation angle θ of the pulse motor 2507, the reading amount r of the potentiometer 2534, and the reading amount z of the potentiometer 5230, the lens frame shape is (rn, θn, zn) (n
= 1, 2,... N). This measurement data (r
n, θn, zn) (n = 1, 2,..., N) are converted from polar coordinates to rectangular coordinates to any four points (x1, y1, z) of data (xn, yn, zn)
1), (x2, y2, z2), (x3, y3, z3), (x4, y4, z4), the frame curve CF and the center of the frame curve (xF, yF, z
F) is calculated (the calculation formula is the same as the method for obtaining the lens curve).

In addition, in FIG. 6A, the x, y components (xn, yn, zn) (x
n, yn), the measured point A (xa, y) having the maximum value in the x-axis direction
a), a measured point B (xb, yb) having a minimum value in the x-axis direction, a measured point C (xc, yc) having a maximum value in the y-axis direction, and a measured point having a minimum value in the y-axis direction Select D (xd, yd) and set the geometric center OF (xF, yF) of the lens frame From the known frame center
From the distance L of the rotation center of the lens to OO (xO, yO) and the deviation (Δx, Δy) of OO and OF, the distance FPD between the lens frame geometric centers
Is obtained as FPD / 2 = (L−Δx) = {L + (xF−X0)} (2)

In the above, the method of obtaining the FPD when the center of the frame coincides with the center of the device has been described. However, the FPD may be obtained by using another frame holding device.

In FIG. 6-2, S is spectacles, and 291 is a frame holder that slides oppositely and holds the spectacles S. Also,
Reference numeral 292 denotes a positioning pin, and 293 denotes a stylus of the measuring unit.

To determine the FPD in the boxing system, the bottom of the groove near the nose side of the lens frame on the non-trace side is brought into contact with the positioning pin 292 movable in the Y-axis direction and the Z-axis direction (perpendicular to the paper surface). After biasing the glasses S so that 292 is in contact with the bottom of the groove closest to the nose, the frame is held by the frame holder 291 that slides oppositely,
In the measuring section, the lens frame shape (xn, yn, zn) (n = 1, 2,...)
N) is measured.

From the position O of the positioning pin that does not change in the X-axis direction, xn
Can be obtained as the FPD.

Further, the FPD can also be obtained by bringing the positioning pin 292 into contact with the lens frame closest to the ear and obtaining the minimum value of xn. Further, the positioning pin 292 is not limited to the one in the embodiment, and may be a pin that can be restrained in the X-axis direction, for example, a stylus of another measuring unit. further,
Instead of urging the spectacles S, the positioning pin 292 may be moved in the X-axis direction.

The FPD can also be obtained by tracing the left and right frame frames alternately or simultaneously.

Next, the inset amount I1 is calculated from the interpupillary distance PD specified by the input unit 4 described later. And the position OS (xS, yS) where the optical center of the lens to be processed should be located, based on the set upward shift amount U1, Asking.

From this OS, (xn, yn) is converted into polar coordinates centered on OS, and the processed data is (Srn, Sθn) (n = 1, 2,...).
N) is obtained, the edge thickness is measured by the unprocessed lens shape measuring unit 5, and the bevel curve and the bevel position are obtained.

The above shift amount does not consider an error due to a curve in the Z-axis direction of the lens frame. Therefore, next, the correction of the shift amount in consideration of the curve in the Z-axis direction will be described.

The shift amount in the x-axis direction will be described with reference to FIG.

The shift amount is calculated based on the Z-axis data of the spectacle frame, the lens curve, and the bevel curve by combining these data in addition to the FPD value and the PD value. The data is converted into data when the lens is attached to the lens frame, and the bevel apex positions on the ear side and the nose side are obtained.

FPD is determined by the method described above,
Store it in the computer's memory. The PD is measured in advance and is input by the input unit 4 and serves as data for calculating the shift amount together with the FPD.

As shown in FIG. 6-3, the positions of the nose side and the ear side of the top of the bevel are V1 (xL, zL) and V2 (x2, z2), and the middle point between these two points is OF '. Further, let OL (xL, zL) be the center position of the lens front curve when the lens is put in the frame, and let rL be the radius. The distances of V1 and V2 to the lens front curve are not exactly equal, but they are at the same distance because the error is very small even if V1 and V2 are at the same distance from the lens front curve and the following calculations are performed. The following operation is performed. The method of measuring the lens front surface curve will be described later in a lens shape measuring device 5.

The formula (x
−xL) ² + (z−zL) ² = rL ² to determine the value zPD of the designated PD position in the z-axis direction. And the center OL of the front curve (xL, z
L), the intersection of a straight line passing through the PD position OPD (xPD, zPD) on the front surface of the lens and a straight line passing through the bevel vertices V1 (x1, z1) and V2 (x2, z2) is represented by OPD ′ (xPD ′, zPD ′). ), OF ', OP
The distance between D 'is the actual shift amount I2 in the x-axis direction.

Even if the bevel position is not determined, if the position on the nose side and the position on the ear side of the apex of the groove of the lens frame are determined (substantially coincides with the trace data of the eyeglass frame), the positions on the nose side are respectively determined. If V1 and the position on the ear side are replaced with V2 and the distance between the lens front curve and V1 and V2 is set, the shift amount can be obtained with an error almost equal to the above method.

Similarly, the shift amount U2 in the y-axis direction is obtained, and based on I2 and U2,
The position OS '(xS',
yS '). From this OS ', (xn, yn) is converted to polar coordinates centered on OS', and the processed data (Srn ', S
.theta.n ') (n = 1, 2,... N), and the bevel curve and the bevel position are obtained again.

In the present embodiment, from the lens curve of the lens to be processed, the three-dimensional data of the spectacle frame, and the bevel curve, the PD value is corrected by measuring the arrangement shape of the lens. Can be obtained simply. For example, the EPD value increases depending on the size of the frame, and the curve in the Z-axis direction also increases. Therefore, the correlation between the FPD value and the shift amount is approximately obtained, and the shift amount is simply corrected based on the correlation. Can also. Such a simple correction is essentially the same as the correction described above,
It is included in the concept of the present invention.

In the apparatus of the present embodiment, it is possible to measure the shapes of the left and right lens frames, respectively, or to measure the shape of one of the left and right lens frames and use the inverted data for the other.

(3) Unprocessed lens shape measuring unit (a) Configuration FIG. 7 shows the entire unprocessed lens shape measuring unit for detecting the curve value, edge thickness, etc. of the lens after grinding under predetermined conditions before grinding. It is a schematic diagram. The detailed configuration will be described with reference to FIGS.

FIG. 8 is a cross-sectional view of the shape measuring section 5 of the raw lens, and FIG.
The figure is a plan view.

The shaft 501 is rotatable by the bearing 502 on the frame 500,
A DC motor 503, photo switches 504 and 505, and a potentiometer 506 are respectively assembled.

A pulley 507 is rotatable on the shaft 501, and a pulley 508,
Flanges 509 are respectively assembled.

A sensor plate 510 and a spring 511 are assembled to the pulley 507.

A spring 511 is provided on the pulley 508 with a pin 512 as shown in FIG.
It is assembled so as to sandwich it. Therefore, the spring 511
When the pin 511 rotates together with the rotation of the pulley 507, the spring 511 has a spring force to rotate the pin 512 attached to the rotatable pulley 508. Applies a force to return the pin 512 to its original position.

A pulley 513 is attached to the rotating shaft of the motor 503, and the belt 514 hung between the pulley 507 and the
The rotation of 503 is transmitted to pulley 507.

The rotation of the motor 503 is detected and controlled by photo switches 504 and 505 by a sensor plate 510 attached to a pulley 507.

The rotation of the pulley 507 causes the pulley 508 with the pin 512 attached thereto to rotate, and the rotation shaft of the potentiometer 506 causes the pulley to rotate.
The rotation of the pulley 508 is detected by the potentiometer 506 by the rope 521 missing between the pulley 520 and the rope 521. At this time, the shaft 501 and the flange 509 rotate simultaneously with the rotation of the pulley 508. The spring 522 is for keeping the tension of the rope 521 constant.

The feelers 523 and 524 are rotatably assembled to the measurement arm 527 by pins 525 and 526, respectively, and the measurement arm 527 is attached to the flange 509.

The photoswitch 504 detects the initial position of the measurement arm 527 and the measurement end position. The photoswitch 505 detects the relief positions of the feelers 523 and 524 and the measurement position with respect to the front refracting surface of the lens and the rear refracting surface of the lens, respectively. The measurement end position of the photo switch 504 coincides with the escape position of the rear refractive surface of the lens by the photo switch 505. FIG. 11 is a diagram showing the correspondence between the signals of the photo switch 504 and the photo switch 505.

As shown in FIG. 12, a shaft 529 on which a microswitch 528 is assembled is arranged on the measuring arm 527, and a rotatable arm 531 having a rotatable feeler 530 on the shaft 529.
The micro switch 528 detects the position of the feeler 530 by a spring 532.

The cover 533 prevents adhesion of grinding water or the like to the measuring device, and the sealing material 534 prevents entry of grinding water or the like from between the cover and the measuring device.

In this embodiment, the feeler 530 shown in FIG. 3 is provided so as to abut on the lens edge. However, when the lens is not suitable for processing, the feeler 530 can be omitted because the feelers 523 and 524 also show abnormal data. It is.

(B) Measuring method First, the motor 503 controlled by the photo switch 505 is rotated, and the measuring arm 527 is rotated from the initial position to the clearance position of the refracting surface on the front side of the lens as shown in FIG. 13-1. At the escape position, when the carriage 700 holding the lens moves in the direction of the arrow, the feeler 523 and the lens do not interfere with each other, and the feeler 530 has a positional relationship such that the feeler 530 contacts the lens edge.

Next, the lens LE moves in the direction of the arrow 535. The movement amount is controlled by the shape data of the spectacle frame to be framed after the lens processing. The lens moves in the direction of the arrow based on these data.

If the lens size does not deviate from the shape data of the eyeglass frame, the feeler 530 contacts the lens edge and the arrow 5
It moves in 38 directions, and the microswitch 528 detects it. Micro switch 52 when lens size is off
A signal indicating that grinding is not possible is displayed on the display unit 3 by the signal 8.
When the micro switch 528 detects the movement of the feeler 530, the motor 503 is rotated so as to bring the feeler 523 into contact with the front refracting surface in order to measure the shape of the lens front refracting surface. The amount of rotation is the general thickness of the lens and feeler 53
Rotate to the position designed considering the edge length of 0. This state is shown in FIGS. 13-2 and 13-3.

When the feeler 523 moves to the position indicated by the two-dot chain line in the figure, the force of the spring 511 to which the pulley 507 is attached acts so that the feeler 523 comes into contact with the front refracting surface.

Next, when the lens is rotated once around the chuck shafts 704a and 704b, the lens moves in the direction of arrow 536 according to the shape data of the spectacle frame, the feeler 523 moves in the direction of arrow 537, and the amount of movement is The amount of rotation is detected by the potentiometer 506 to obtain the shape of the front lens refracting surface. At the same time, whether or not the lens can be processed into a lens shape according to the above data is also measured by the microswitch 528, and this is displayed.

Thereafter, the carriage 700 is returned to the initial position, and the motor 503 is
Is further rotated to the position of the relief for the measurement of the rear refractive surface of the lens, and then the lens is moved to the measurement position. The amount of movement is measured by the feeler 524 while rotating the lens once, in the same manner as the measurement of the front refraction surface.

[Effects] According to the spectacle lens grinding machine of the present invention, an advance is made so that an error does not occur between the optical center distance of the lens to be processed and the designated PD value regardless of the shape of the frame or the lens. Can be calculated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the overall configuration of a lens grinding apparatus according to the present invention. FIG. 2 is a perspective view showing a lens frame shape measuring unit according to the present embodiment. Fig. 3-1 shows the frame holder
FIG. 2000 shows the operation of the wire 2004, FIG. 3-2 shows the operation of the wire 2004, FIG. 3-3 shows the operation of the wires 2146 and 2149, and FIG. FIG. 3-5 is an explanatory view showing the fixing mechanism on the lower slider side, and FIG. 3-6 is an explanatory view showing the operation of the wire 2246. FIG. 4-1 is a plan view of the measuring section, FIG. 4-2 is a sectional view taken along line CC of FIG. 4, FIG. 4-3 is a sectional view taken along line DD, and FIG.
The figure is an EE cross-sectional view. FIGS. 5-1 and 5-2 are explanatory views showing the movement of the tracing stylus in the vertical direction. No. 6-1
The figure is an explanatory view showing the coordinate conversion. FIG. 6-2 is an explanatory diagram showing another method of obtaining the distance between the geometric centers of the eyeglass frames. FIG. 6-3 is an explanatory diagram for calculating the shift amount. Seventh
The figure is a schematic view of the entire shape measuring section of the raw lens, FIG. 8 is a sectional view of the shape measuring section of the raw lens, and FIG. 9 is a plan view of the shape measuring section of the raw lens. FIG. 10 is an explanatory view showing the operation of the spring and the pin. Fig. 11 shows a photo switch 504
FIG. 12 is a diagram showing a correspondence relationship between each signal of the
The figure shows the figure for measuring the lens radius, FIG. 13-1 and FIG. 13-2.
FIG. 13 and FIG. 13-3 are diagrams for explaining the measuring operation of the measuring unit. 2 ... Lens frame and template shape measuring device 3 ... Display unit 4 ... Input unit 5 ... Lens shape measuring device 6 ... Lens grinding unit 7 ... Carriage unit 8 ... Bevel processing unit

Claims (3)

(57) [Claims] 1. A spectacle lens grinding machine that lays out a lens to be processed with respect to a lens frame based on frame information, a geometric center distance, and a pupil distance of the lens frame, and processes the lens based on the layout. Three-dimensional frame information input means for obtaining three-dimensional frame information in the radial direction of the lens frame and in a direction (Z direction) orthogonal to the lens frame; lens shape measuring means for measuring the shape of the lens to be processed; The three-dimensional frame information, the XZ (where the direction of the pupil distance is the X direction) plane shape of the lens to be processed after the frame is obtained based on the shape of the lens to be processed, and the geometric center Calculating means for calculating the shift amount in the X direction of the lens whose optical axis is not parallel to the Z direction from the relationship between the distance and the interpupillary distance such that the optical center thereof is at a position corresponding to the interpupillary distance; Set Eyeglass lens grinding machine, characterized in that the. 2. A spectacle lens grinding machine according to claim 1, wherein said calculating means is a nose / ear determined based on a lens front curve obtained by said lens shape measuring means and a measurement result of said lens shape measuring means. An eyeglass lens grinding machine characterized by having a step of obtaining an optical axis of a lens to be processed after framing processing based on a bevel position on a side. 3. A spectacle lens grinding machine according to claim 1, wherein said calculating means includes a lens front curve obtained by said lens shape measuring means, and positions on a nose side and an ear side based on three-dimensional frame information of said lens frame. Eyeglasses having a step of obtaining an optical axis of the lens to be processed after the framing processing based on the information, and obtaining an approximate shift amount in the X direction of the lens to be processed whose optical axis is not parallel to the Z direction. Lens grinding machine.