JP3110030B2 - Eyeglass lens grinding machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an eyeglass lens grinding machine (a balling machine) having an eyeglass frame tracing device.

[Prior art and its problems] Conventionally, there is known an eyeglass lens grinding machine having a beveled grindstone for forming a bevel on a peripheral portion of a lens in order to support a lens in a frame groove of a lens frame.

Points to note in this beveling process are the position of the top of the bevel in the edge and the bevel curve. However, in the past, the setting of the bevel top position and the bevel curve had to rely on the intuition and experience of the operator.

In order to solve the above-mentioned drawbacks, there is known a method in which a lens bevel shape is displayed as a cross-sectional shape in the meridian direction at an arbitrary lens radius, and a bevel apex position and a bevel curve are determined by moving a bevel display position. ing. This apparatus has an edge thickness measuring means for measuring the edge thickness of the lens to be processed, and is obtained after the beveling of the lens to be processed from the information of the edge thickness obtained from the edge thickness measuring means and the bevel shape of the beveling grindstone. The expected lens bevel shape is calculated by calculation, and the result is displayed.

However, the above configuration displays only the cross section of the lens after processing, and thus cannot display the cutting allowance of the lens, particularly, the cutting allowance near the top of the bevel, so that there is a disadvantage that information regarding the processing is insufficient. there were.

The present invention has been devised in view of the above drawbacks, and in beveling, a spectacle lens grinding process having a spectacle frame tracing device capable of obtaining sufficient processing information in advance and easily confirming the processing information. It is a technical task to provide a machine.

[Constitution of the Invention] In order to achieve the above object, the present invention provides a spectacle lens grinding machine for framing a spectacle lens, based on shape data input means for obtaining shape data of the spectacle frame, based on the shape data of the spectacle frame. Detecting means for contacting the feeler with the front and rear surfaces of the spectacle lens to detect the contact positions, a bevel path calculating device for obtaining a bevel path to be formed based on the detection result of the detecting means, and a shape of the spectacle frame Displaying the contour of the spectacle lens after processing based on the data, and displaying the shape of the edge of the spectacle lens before finishing at the position specified on the contour of the spectacle lens based on the detection result of the detection means. Display means for displaying the beveling grindstone at a position indicating the end of the beveling with respect to the edge of the spectacle lens based on the bevel locus. It is characterized by

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

(1) Overall Configuration of 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.

Reference numeral 6 denotes a lens grinding unit, a rough grinding wheel 60a for a glass lens, a rough grinding wheel 60b for a plastic, and a rough grinding wheel 60c for beveling and flat machining.
Is rotatably attached to the rotating shaft 61. The rotation shaft 61 is fixed to the base 1 with a band 62.

A pulley 63 is attached to an end of the rotating shaft 61.
The pulley 63 is connected via a belt 64 to a pulley 66 attached to a rotating shaft of an AC motor 65. Because of this motor
When 65 rotates, the grindstone 60 rotates.

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

(2) Configuration and operation of each part (a) Carriage part The structure will be described with reference to FIGS. FIG. 2 is a sectional view of the carriage. FIG. 3-a is an arrow view A showing the drive mechanism of the carriage, and FIG.
It is BB sectional drawing of a figure.

A carriage shaft 702 is rotatably supported on a shaft 701 fixed to the base 1, and a carriage 700 is rotatably supported on the carriage shaft 702. Timing pulleys 703a, 703b, 703c having the same number of teeth are respectively fixed to the carriage shaft 702 at the left end, the right end, and between them.

Lens rotating shafts 704a, 704b are coaxially and rotatably supported on the carriage 700 in parallel with the shaft 701 and at a constant distance. The lens rotation shaft 704b is rotatably supported by the rack 705, and the rack 705 is movable in the axial direction.
It can be moved in the axial direction by a pinion 707 fixed to the rotation axis of the motor 706, whereby the lens LE can be held between the lens rotation axes 704a and 704b. Note that the lens rotation axis 704
Pulleys 708a and 708b having the same number of teeth are mounted on the respective a and 704b, and they are timing belts 709a and 709b.
And are connected to the pulleys 703c and 703b.

An intermediate plate 710 is rotatably fixed to the left side of the carriage 700. The intermediate plate 710 has two cam followers 711, which sandwich the guide shaft 712 fixed to the base 1 in a positional relationship parallel to the shaft 701. A rack 713 is fixed to the base 1 in a positional relationship parallel to the shaft 701 on the intermediate plate 710, and a carriage left / right moving motor 714
Meshes with the pinion 715 attached to the rotating shaft of. With these structures, the motor 714 can move the carriage 700 in the axial direction of the shaft 701.

A driving plate 716 is fixed to the left end of the carriage 700, and a rotating shaft 717 is attached to the driving plate in parallel to the shaft 701 and rotatably. A pulley 718 having the same number of teeth as the pulleys 708a and 708b is attached to the left end of the rotating shaft 717, and the pulley 718 is connected to the pulley 703a by a timing belt 719.

A gear 720 is attached to the right end of the rotating shaft 717.
The 720 meshes with the gear attached to the motor 721. When the motor 721 rotates, the pulley 718 is rotated by the gear 720, and the carriage shaft 7 is rotated via the timing belt 719.
02 rotates, thereby rotating the lens chuck shafts 704a and 704b via the pulleys 703b and 703c, the timing belts 709a and 709b, and the pulleys 708a and 708b.

The block 722 is fixed to the drive plate 716 coaxially and rotatably with the rotation shaft 717, and the motor 721 is fixed to the block 722.

The intermediate plate 710 has a shaft 72 in a direction parallel to the shaft 701.
3 is fixed, and a correction block 724 is attached to the shaft 723.
Are rotatably fixed. Round rack 725 is rotating shaft 717
It is arranged so as to be slidable in parallel with the shortest line segment connecting the axes of the shaft 723 and the shaft 723, and penetrating through holes formed in the block 722 and the correction block 724. A stopper 726 is fixed to the round rack 725, and can slide only below the contact position of the correction block 724.

A sensor 727 is provided on the intermediate plate 710, and the state of contact between the stopper 726 and the correction block 724 can be confirmed, and the grinding state of the lens can be known.

A pinion 730 fixed to the rotating shaft 729 of the motor 728 fixed to the block 722 is engaged with the round rack 725,
Accordingly, the distance γ ′ between the rotating shaft 717 and the shaft 723 can be controlled by the motor 728.

Further, with such a structure, a linear relationship is maintained between γ ′ and the rotation angle of the motor 728.

The distance (BC) between the grinding wheel rotation center B and the shaft 701 is α, the distance (AC) between the lens chuck shafts 704a, 704b and the shaft 701 (β) is β, the lens chuck shafts 704a, 704b and the grinding wheel rotation center. , The angle between α and β is θ,
The distance (CD) between the shafts 723 and 701 is α ′, the distance (CE) between the rotating shaft 717 and the shaft 701 β ′, and the angle between α ′ and β ′ is θ ′. .

 FIG. 4 schematically shows the positional relationship.

α, α ′, β, β ′ are invariable, and the center of rotation of the grindstone and the respective center points of the shafts 701 and 723 are invariant on the plane of the drawing. The center point rotates around the shaft 701 without changing the relative positional relationship.

Here, if θ = θ ′, α ′ / α = β ′ / β, then △
ABC and △ EDC are similar. At this time, α ′ / α = γ ′
/ Γ, and γ ′ and γ have a linear correlation.

With such a structure, the block 722 in which the motor 721 for rotating the pulley 718 that rotates about the rotation shaft 717 is fixed, follows the change of △ CED when γ ′ is changed, and the block 722 is centered on the point E. Rotate.

At this time, the rotation of the pulley 718 rotates the lens shafts 704a and 704b at a constant speed as described below.

When γ 'and γ are changed by the motor 728 while rotating the pulley 718, the pulley viewed with the line segment ED as a reference line
The rotation angle of 718 and the rotation angle of the lens axis when the line segment AB is used as a reference line are equal. Also, the motor 721 and the lens shaft 704a,
There is also a linear correlation with the rotation of 704b.
In other words, the distance between the grinding wheel axis and the lens axis is
The lens shafts 704a and 704b change with a correlation with the output shaft rotation angle of the motor and rotate with a linear correlation with the output shaft rotation angle of the motor 721.

A hook of a spring 731 is hooked on the driving plate 716, and a wire 732 is hooked on the hook on the opposite side. The rotating shaft of the motor 733 fixed to the intermediate plate 710 has a drum, and the wire 732 can be wound up. Thereby, the grinding pressure of the grinding wheel 60 of the lens LE can be changed.

(B) Lens frame and template shape measuring unit (tracer) (a) Configuration The configuration of the lens frame and template shape measuring unit 2 will be described based on FIG. 5 and FIGS. 6-1 to 6-6. I do.

FIG. 5 is a perspective view showing a lens frame and a template shape measuring unit according to the present embodiment. The headquarters is built into the main body and consists of two main parts: a frame and template holding unit 2000 that holds the frame and template, and a measuring unit 2100 that digitally measures the shape of the lens frame and template of the frame. It is configured. The frame and template holding unit 2000 has two more
And a frame holding unit 2000A and a template holding unit 2000B.

In a 6-1 showing the <frame holding section> frame holding section 2000A, define the geometrical substantially central point of the lens frame in the case of setting the spectacle frame in the frame holding section 2000A reference point O _R, as O _L, A straight line passing through these two points is defined as a reference line.

The frame holding unit 2000A has a housing 2001. Center arm 2002 housing 2001 guide shaft attached to the surface 2003a, which is slidably mounted on 2003b, a frame押E 2004 at the same intervals as O _R, O _L is the tip of the center arm 2002, There is 2005.

Similarly, the light arm 2006 is connected to the guide shaft 2007a, 20
On 07b, left arm 2009 is attached to guide shaft 2010a, 201
On the other hand, a frame pusher 2008 is rotatably supported at the tip of the right arm 2006, and a frame pusher 2011 is rotatably supported at the tip of the left arm 2009.

The center arm 2002 is O _R , O
As through _L, and the slides to the reference line and a direction perpendicular write arm 2006 frame押E 2008 passes through the O _R, the reference line as the left arm 2009 frame押E 2011 passes through O _L substantially
Sliding in a 30 ° inclined direction.

In FIG. 6-2, the frame pusher 2004, 2005, 2008, 2
011 indicates two slopes that intersect each other (2012a, 2012
b), (2014a, 2014b), (2016a, 2016b), (2018a, 201
8b), the ridge line created by each two slopes 2013,201
5,2017,2019 are on the same plane (measurement plane), and the rotation axis of the frame presser 2008,2011 is also on this measurement plane.

The center arm 2002 has a semicircular frame
2020 is slidably mounted on guide shafts 2021a and 2021b attached to the center arm 2002. In FIG. 6-3, a spring 2022 is provided so that the frame pusher 2020 is constantly pulled toward the center arm. One end is center arm
It is hung on a pin 2023a planted in 2002 and the other end is hung on a pin 2023b planted in the frame pusher 2020.

FIG. 6-4 is a diagram of a part of the housing 2001 as viewed from the back side.

Pulleys 2024a, 2024b, 2024c, 2024
d is rotatably supported, a wire 2025 is hung on the pulleys 2024a to 2024d, and holes 2028a and 2029 of the housing 2001 are provided.
It is fixed to a pin 2026a planted on the center arm 2002 and a pin 2027 planted on the light arm 2006, which protrude from the back surface through a.

Similarly, pulleys 2030a, 2030b, 2030
c and 2030d are rotatably supported, and pulleys 2030a to 2030d
Wire 2031 is hung on the
Center arm 2 protruding from the back through 28b and 2029b
002 and a pin 2032 implanted in the left arm 2009. A constant torque spring 2033 that constantly pulls the center arm 2002 in the O _R and O _L directions is attached to the back of the housing 2001 on a drum 2034 rotatably supported on the back of the housing 2001. 20
One end of 33 is fixed to a pin 2035 implanted in the center arm 2002.

Further, a claw 2036 is implanted in the center arm 2002, and when the frame is not held, the housing 20
01 is in contact with the microswitch 2037 attached to the back surface, and the state of holding the frame is determined.

The left arm 2009 incorporates a rim thickness measuring unit 2040 that measures the thickness of the rim of the frame.

A pulley 2042 is fixedly attached to the rotating shaft 2041 of the frame pusher 2011, and rotates integrally with the frame pusher 2011, and a pulley that rotates independently of the rotation of the frame pusher 2011 is attached to the rotating shaft 2041. 2043 is pivotally supported, and a rim thickness measuring pin 2044 is implanted in the pulley 2043.

Further, a hollow rotary shaft 2045 is rotatably supported on the left arm 2009, and a potentiometer 20 is provided at one end.
46 has a pulley 2047 attached to the other end. A wire 2049 whose both ends are fixed to each pulley is hung between the pulley 2042 and the pulley 2047, and the potentiometer 2046 and the frame pusher 2011 always rotate in the same direction in conjunction with each other.

In FIG. 6-5, one end of the wire 2050 is a pulley.
Pin fixed to 2043, fixed to pulley 2048 on the way, the other end is implanted in left arm 2009 via spring 2051
The axis of the potentiometer 2046 rotates according to the movement of the rim thickness measuring pin 2044.

In this embodiment, only one rim thickness measurement is performed. However, a contact that can move up and down and can detect the amount of movement is attached to the tracing stylus part 2120, and is brought into contact with the rim front when measuring the lens frame shape. Can be detected in the vertical direction. From the data on the front surface of the rim and the data in the vertical direction of the V-groove, the rim thickness over the entire circumference of the lens frame can be measured.

In FIG. 6-6, a pressing plate 2061 having a brake rubber 2062 attached to one surface thereof is rotatably mounted on a housing 2001 by a shaft 2063 mounted on the pressing plate 2061, and is attached to the housing 2001. One end of the sliding shaft of the solenoid 2064 is attached to the pressing plate 2061. One end of a spring 2065 is hung on the pressing plate 2061, and the other end is hung on a pin 2066 planted in the housing 2001.
Pulls the pressing plate 2061 in a direction not to contact the center arm 2002. When the solenoid 2064 acts and presses the pushing plate 2061 against the spring 2065, the brake rubber 2062 comes into contact with the center arm 2002, and the right arm 2006 and the left arm 2009 which move in conjunction with the center arm 2002 are moved. Fix it.

<Template Holder> The template holder 2000B is shown in FIGS. 5 and 6-1.
It is supported by columns 2071a, 2071b, 2071c, 2071d implanted in the housing 2001. The board 2072 is fixed to the columns 2071a to 2071d. The lid 2073 is a shaft 20 implanted in the lid 2073.
74a and 2074b are engaged with bearings 2075a and 2075b formed on the substrate 2072, and are mounted on the substrate 2072 in a rotatable manner. substrate
2072 has enough holes to allow the spectacle frame to enter and exit the frame holder. Lid 2073 has a transparent window 2076
Is formed, and a template holder 2077 is fixed to the center of the window 2076. Pins 2078a, 2078b are implanted in the template holder 2077, and holes formed in the template and pins 2078a,
Engage the 2078b and set the template with the set screw 2079.
Fixed to 077. The center of this template holder 2077 is the lid 2
In a state in which 073 is closed, and is configured so as to be positioned on O _R.

<Measurement Unit> Next, the configuration of the measurement unit 2100 will be described with reference to FIGS. 7-1 to 7-4. FIG. 7-1 is a plan view of the measuring unit, FIG. 7-2 is a CC sectional view thereof, FIG. 7-3 is a DD sectional view, and FIG. 7-4 is an EE sectional view thereof. is there.

Shaft holes 2102a, 2102b, 2102c are formed in the movable base 2101, and the shafts 2103a, 2103b attached to the housing 2001 are formed.
Slidably supported by Further, a lever 2104 is implanted in the movable base 2101. The movable base 2101 is slid by the lever 2104, so that the rotation base 2101 is rotated.
The center of rotation of 2105 is on the frame and template holder 2000
Move to the O _R and O _L positions. Pulley for movable base 2101
A rotation base 2105 on which a 2106 is formed is rotatably supported. Pulley attached to the rotating shaft of pulse motor 2107 attached to pulley 2106 and movable base 2101
A belt 2109 is stretched between the belt 2108 and the rotation of the pulse motor 2107 to the rotation base 2105.

As shown in FIG. 7-3, four rails 2110a, 2110b, 2110c, 2110d are mounted on the rotating base 2105, and the probe 2120 is slidably mounted on the rails 2110a, 2110b. Have been. The stylus part 2120 has a shaft hole 2121 formed in the vertical direction.
2122 has been inserted.

A ball bearing 2123 is interposed between the tracing stylus shaft 2122 and the shaft hole 2121, thereby smoothing the vertical movement and rotation of the tracing stylus shaft 2122. An arm 2124 is attached to the upper end of the tracing stylus shaft 2122.
On the upper part, a bevel tracing stylus 2125 in the shape of a solo bang that is in contact with the bevel groove of the lens frame is rotatably supported.

A cylindrical template measuring roller 2126 abutting on the edge of the template is rotatably supported below the arm 2124. The circumferential points of the bevel tracing stylus 2125 and the template measuring roller 2126 are configured to be located on the center line of the tracing stylus shaft 2122.

Below the tracing stylus shaft 2122, a pin 2128 is implanted in a ring 2127 rotatably attached to the tracing stylus shaft 2122, and the movement of the pin 2128 in the rotational direction is formed in the tracing stylus portion 2120. Limited by slot 2129. The tip of the pin 2128 is attached to the movable part of the potentiometer 2130 of the tracing stylus 2120, and the amount of vertical movement of the tracing stylus 2122 is detected by the potentiometer 2130.

A roller 2131 is rotatably supported at the lower end of the tracing stylus shaft 2122. A claw 2132 is implanted in the tracing stylus 2120.

A pin 2133 is implanted in the tracing stylus part 2120, and a pulley 2135 is attached to a shaft of a potentiometer 2134 attached to the rotating base 2105. Rotation base
Pulleys 2136a and 2136b are rotatably supported by 2105, and a wire 2137 fixed to a pin 2133 is connected to the pulley 2136.
a, 2136b, and is fixed to the pulley 2135.
In this way, the amount of movement of the stylus
It is configured to detect by 2134.

The stylus 2120 is always armed on the rotating base 2105.
The constant torque spring 2140 that pulls to the tip side of the 2124
The fixed torque spring 2140 is fixed to one end of a pin 2142 implanted in the tracing stylus 2120, and is attached to a drum 2141 rotatably supported by the 2105.

A tracing stylus drive unit 2150 is slidably mounted on rails 2110c and 2110d on a rotating base 2105. A pin 2151 is implanted in the probe driving unit 2150, and the rotation base 2105
The pulley 2153 is attached to the rotation axis of the motor 2152 attached to
Is attached. Pulley 2154 on rotating base 2105
a and 2154b are rotatably supported on a shaft, and a wire 2155 fixed to the pin 2151 is hung on the pulleys 2154a and 2154b and fixed to the pulley 2153. Thereby, the rotation of the motor is transmitted to the tracing stylus drive unit 2150.

The tracing stylus drive unit 2150 is in contact with the tracing stylus unit 2120 that is pulled toward the tracing stylus driving unit 2150 by the constant torque spring 2140. It can be moved to a position.

Further, the tracing stylus drive unit 2150 has an arm 2157 at one end that comes into contact with a roller 2131 rotatably supported at the lower end of the tracing stylus shaft 2122, and an arm 2158 that rotatably supports the roller 2159 at the other end. The attached shaft 2156 is rotatably supported. Coro 21
One end of the torsion spring 2166 is hung on the arm 2157, the other end is fixed to the tracing stylus driving unit 2150, and the tracing stylus driving unit 2150 is When moved, the roller 2159 moves up and down along the guide plate 2160.

The shaft 2156 is rotated by the up and down movement of the roller 2159, and the arm 2157 fixed to the shaft 2156 also rotates about the shaft 2156, and the stylus shaft 21
Raise and lower 22. A shaft 2163 is rotatably attached to the rotation base 2105, and a movable guide plate 2161 is fixed to the shaft 2163. One end of the sliding shaft of the solenoid 2164 attached to the rotation base 2105 is a movable guide plate 2161
It is attached to. One end of the spring 2165 is hung on the rotation base 2105, and the other end is hung on the movable guide plate 2161,
Normally, the roller 2159 and the guide portion 2162 of the movable guide plate 2161 are pulled to a position where they do not abut. When the movable guide plate 2161 is lifted by the action of the solenoid 2164, the guide portion 2162 of the movable guide plate 2161 moves to a position parallel to the fixed guide plate 2160, and the roller 2159 contacts the guide portion 2162, and moves along the guide portion 2162. Can be moved.

(B) Operation Next, the operation of the above-described lens frame and template shape measuring device 2 will be described with reference to FIGS. 6-1 to 10.

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

Select the left or right side of the lens frame of the glasses frame 600 to measure, and set the lever 2104 fixed to the movable base 2101.
To move the measuring unit 2100 to the side to be measured.

Next, pull the frame pusher 2020 toward you and move the center arm
Widen the interval with 2002 sufficiently. The front part of the eyeglass frame is pressed down by the frame. 2004, 2005, slope 2012a, 2012b, 2014
a, 2014b, the frame presser 2020 is returned, and is brought into contact with the center of the eyeglass frame. Then, while pushing down the center arm 2002, press down the rim thickness measuring pin 2044 with the rim of the glasses frame,
The right and left rim parts are brought into contact with the slopes 2016a, 2016b, 2018a and 2018b of 08 and 2011.

In the present embodiment, the frame pusher 2004, 2005, 2008, 2
011 are interlocked, and are pulled in the direction toward O _R and O _L by the constant torque spring 2033, and the frame presser 2020 is pulled in the center arm direction by the spring 2022. , 2011, 2020, the lens frame is held by the three directions of force toward the geometric center of the lens frame, and the frame is pushed.
The center position of the frame is held at an intermediate point of the O _R, O _L by. Also, since the frame presser 2008, 2011 rotates in the plane created by the four frame presser ridges 2013, 2015, 2017, 2019, the center of the bevel groove of the lens frame is the frame presser 2004, 2
It is always held in the measurement plane at the center position of 005, 2008, 2011.

8-1 and 8-2 are diagrams showing a measuring method. FIG. 8-1 shows a case where the bevel groove is parallel to the measurement surface, and FIG. FIG.

In FIG. 8-1, the rim portion of the lens frame presses down the rim thickness measuring pin 2044, and when the bevel groove is parallel to the measurement surface, the ridge line 2019 formed by the slopes 2018a and 2018b of the frame pushing 2011 is used as a reference. The movement amount of the rim thickness measuring pin 2044 can be detected by the potentiometer 2046.

In FIG. 8-2, when the bevel groove is inclined at an angle with respect to the measurement surface, the frame presser 2011 is inclined along the rim portion, and the potentiometer 2046 is equivalent to the inclination.
The rim thickness can always be measured with reference to the ridgeline 2019.

The rim thickness data thus obtained is compared with the edge thickness and used to determine an optimum bevel position so that the rim of the frame and the front refracting surface of the lens are at appropriate positions.

When the trace switch on the operation panel is pressed with the frame set as described above, the solenoid 2064 operates to fix the center arm 2002, the right arm 2006, and the left arm 2009.

In FIGS. 9-1 and 9-2, the probe driving unit 21
The 50 rollers 2159 are at the reference position O, rotate the pulse motor 2107 by a predetermined angle, and turn the rotary base 2105 to a position where the moving direction of the tracing stylus drive unit 2150 and the moving direction of the frame presser 2008 or 2011 match.

Next, when the guide portion 2162 of the movable guide plate 2161 is moved to a predetermined position by the solenoid 2164 and the tracing stylus drive portion 2150 is moved in the direction of the frame pressing 2008 or 2011, the roller 21
59 moves from the guide portion 2160a of the fixed guide plate 2160 to the guide portion 2162b of the movable guide plate 2161, the tracing stylus shaft 2122 is pushed up by the arm 2157, and the bevel tracing stylus 2125 is maintained at the height of the measurement surface.

When the probe drive unit 2150 moves further, the bevel probe
2125 is inserted into the bevel groove of the lens frame,
The movement is stopped by FR, and the tracing stylus drive unit 2150 moves to FRL and stops. Thereby, the arm 2157 separates from the roller 2131, and the bevel tracing stylus 2125 can descend from the measurement plane. Subsequently, the pulse motor 2107 is rotated every predetermined number of unit rotation pulses. At this time, the tracing stylus unit 2120 moves on the guide shafts 2110a and 2110b according to the moving radius of the lens frame, the amount of movement is read by the potentiometer 2134, and the tracing stylus 2122 moves up and down according to the curve of the lens frame. The movement amount is read by the potentiometer 2130. The rotation angle の of the pulse motor 2107, the reading amount r of the potentiometer 2134, and the potentiometer 2130
From the reading amount z of (r _n , Θ _n , z _n ) (n
= 1,2, ..., N). Any four points (x ₁ , y ₁ , z ₁ ) of the data (x _n , y _n , z _n ) obtained by converting the measurement data (r _n , Θ _n , z _n ) from polar coordinates to rectangular coordinates, ( x ₂ , y ₂ ,
z ₂ ), (x ₃ , y ₃ , z ₃ ), (x ₄ , y ₄ , z ₄ ) frame curve
Find C _F (the formula is the same as how to find the lens curve).

In FIG. 10 _{(x n, y n, z} n) of x, y components (x _n, y _n)
From the measurement point having the maximum value of the y-axis direction _{A (x a, y a)} ,
the measured point B with the minimum value of the y-axis direction (x _b, y _b), the measurement point having the maximum value of the x-axis direction C (x _c, y _c) and the measured with the minimum of x-axis direction point D (x _d, y _d) select, geometric center of the lens frame _{O F (x F, y F} ) , and From the known frame center
The center of rotation _{O 0 (x 0, y 0} ) deviation amount of the distance L and O _0, O _F from to (Δx, Δy), the lens frame geometric center distance FPD 1/2
Is Asking.

Next, the inset amount I is calculated from the interpupillary distance PD set by the input unit 4, And the position O _s (x _s , y _s ) where the optical center of the lens to be processed should be located, based on the set upward shift amount U, Asking.

From this O _s , (x _n , y _n ) is converted into polar coordinates centered on O _s , and the processed data is (sr _n , sΘ _n ) (n = 1,2,...,
N) get.

In the apparatus of the present embodiment, the shapes of the left and right lens frames can be measured, respectively, or the shape of one of the left and right lens frames can be measured, and the other can use inverted data.

<Measurement of Template Shape> Next, an operation when measuring a template will be described.

The holes formed in the template are engaged with the pins 2078a and 2078b of the template holder 2077 attached to the lid 2073 of the template holding unit 2000B, and are fixed to the template holder 2077 with set screws 2079. In this embodiment, when the lid 2073 is closed, the template holder 20 is closed.
Center 77 is positioned on the O _R, designed to reduce coincides with the center of rotation of the gauge head portion 2120, the rotation center of the geometric center and the gauge head portion 2120 of the template match.

With the template set as described above, a trace switch of the input unit 4 described later is pressed. At this time, the rotation base
Reference numeral 2105 denotes a position at which the moving direction of the tracing stylus driving unit 2150 coincides with the y-axis direction, and the tracing stylus driving unit 2150 is at the reference position O.

When the tracing stylus drive unit 2150 is moved in the opposite direction to the frame measurement, the pin 2132 implanted in the tracing stylus unit 2120 abuts the center arm 2002, and when further moved, the center arm 2002, the right arm 2006, the left arm Expand 2009. The roller 2159 is a guide portion 2160b of the fixed guide plate 2160.
The armature 2157 pushes up the stylus shaft 2122 and moves the flange 2126a of the template measuring roller 2126.
Is maintained at a position above the upper surface of the template by a fixed amount. After the probe drive unit 2150 moves to FOL, the solenoid 2064 operates, the center arm 2002, the right arm 2006, and the left arm 2009 are fixed, and the movable guide plate 2161 is moved to a predetermined position by the solenoid 2164 to drive the probe. Return the unit 2150 to the reference position. At this time, the guide portion 2160a of the fixed guide plate 2160
Since the height of the guide portion 2162a of the movable guide plate 2161 is the same as that of the movable guide plate 2161, the template measurement roller 2126 moves while maintaining a constant height until it comes into contact with the template. Subsequently, the pulse motor 2107 is rotated every predetermined number of unit rotation pulses. At this time, the tracing stylus unit 2120 moves on the guide shafts 2110a and 2110b according to the moving radius of the template, and the amount of movement is read by the potentiometer 2134. From the read amount r of the rotation angle theta and potentiometer 2134 of the pulse motor 2107, the template shape _{(r n, Θ n) (} n = 1,2, ......,
N).

From this measurement data (r _n , _{ｎ n} ), the geometric center O is obtained in the same manner as in the frame measurement, and the FPD, P
D, processing data based on the inset I and the top U (sr
obtaining _{n, sΘ n) (n =} 1,2, ......, N) and.

(C) Raw lens shape measuring unit (a) Configuration FIG. 11 shows the entire raw lens shape measuring unit for detecting the curve value and the edge thickness value of the lens after grinding under the predetermined conditions before grinding. It is a schematic diagram. The detailed configuration will be described with reference to FIGS.

FIG. 12 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 50
8, Flange 509 is assembled respectively.

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

The pulley 508 is provided with a spring 511 as shown in FIG.
It is assembled so that 2 is sandwiched. Therefore, when the spring 511 rotates 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, and the spring 512 is independent of the spring 511, for example, an arrow. When rotated in the direction, a force is applied to return the pin 512 to its original position.

A pulley 513 is attached to the rotation shaft of the motor 503,
The rotation of the motor 503 is transmitted to the pulley 507 by a belt 514 hung between the pulley 507 and the 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 rotates the pulley 508 to which the pin 512 is attached, and the rotation of the pulley 508 is detected by the potentiometer 506 by the rope 521 hung between the rotation shaft of the potentiometer 506 and the pulley 520. You. At this time, simultaneously with the rotation of the pulley 508, the shaft 501 and the flange 509
Rotates. The spring 522 is for keeping the tension of the rope 521 constant.

The feelers 523 and 524 are rotatably mounted on the measuring arm 527 by pins 525 and 526, respectively.
27 is attached to the flange 509.

The photo switch 504 detects the initial position of the measurement arm 527 and the measurement end position. The photoswitch 505 detects the relief positions and the measurement positions of the feelers 523 and 524 with respect to the front refracting surface of the lens and the rear refracting surface of the lens, respectively. The measurement end position by the photo switch 504 coincides with the escape position of the rear refractive surface of the lens by the photo switch 505. FIG. 15 is a diagram showing the correspondence between the signals of the photoswitch 504 and the photoswitch 505.

As shown in FIG. 16, a shaft 529 having a micro switch 528 mounted thereon is disposed on the measuring arm 527, and a rotatable arm 531 having a rotatable feeler 530 is provided on the shaft 529. The position of the feeler 530 is detected by the micro switch 528.

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 the present embodiment, the third feeler 530 is provided so as to contact the lens edge. However, when the lens is not suitable for processing, the feeler 523 can be omitted because the feelers 523 and 524 often show abnormal data. It is.

(B) Measuring method First, the motor 503 controlled by the photoswitch 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. 17-1. 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 or the lens shape data of the eyeglass 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 eyeglass frame shape data or the lens shape data, the feeler 530 contacts the lens edge, moves in the direction of arrow 538, and the microswitch 528 detects it. When the lens size is off, a signal from the micro switch 528 is displayed on the display unit 3 indicating that grinding is impossible. When the microswitch 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 to measure the shape of the lens front refracting surface. The rotation amount is rotated to a position designed in consideration of the general thickness of the lens and the length of the feeler 530 in the edge direction. This state is shown in FIGS. 17-2 and 17-3.

When the feeler 523 moves to the position indicated by the two-dot chain line in the figure, the force of the spring 511 attached to the pulley 507 acts to bring the feeler 523 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 the arrow 536 according to the shape data or the lens shape data of the eyeglass frame, and the feeler 523 is moved.
Moves in the direction of the arrow 537, and the amount of movement is detected by the potentiometer 506 via the amount of rotation of the pulley 508, and the lens front side refraction surface shape is obtained. 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.

(D) Display unit and input unit FIG. 18 is an external view of the display unit 3 and the input unit 4 of this embodiment, both of which are formed integrally.

The input unit of the present embodiment includes various sheet switches,
Main switch 400 that controls power on / off,
It comprises a group of setting switches 401 for inputting various types of processing information and a group of operation switches 410 for instructing an operation method of the apparatus.

In the setting switch group 401, a lens switch 402 that indicates whether the material of the lens to be processed is plastic or glass, a frame switch 403 that indicates whether the material of the frame is cell or metal, and select a processing mode of flat processing or bevel processing Mode switch 404, an R / L switch 405 for selecting whether the lens to be processed is for the left eye or the right eye, and a far / near switch 40 for performing upper / lower layout of the lens optical center and distance / nearness conversion of the PD value.
6, Input selector switch 4 to select the setting data change item
07, (+) switch 408 and (-) switch 409 to increase or decrease the data of the item selected by input switch 407
Is arranged.

The operation switches 410 include a start switch 411, a pause switch 412 also serving as a screen changeover switch to a bevel simulation display, a switch 413 for opening and closing a lens chuck, a switch 414 for opening and closing a cover, and a switch 414 for finishing and sliding twice. There are a double sliding switch 415, a trace switch 416 for instructing a lens frame and template trace, and a next data switch 417 for transferring data measured by the lens frame and template shape measurement unit 2.

The display unit 3 is configured by a liquid crystal display,
A set value of processing information, a bevel position, a bevel simulation for simulating a fitting state between the bevel and the lens frame, a reference set value, and the like are displayed under the control of a main arithmetic control circuit described later.

FIGS. 19-1 to 19-4 are examples of display screens.
FIG. 19-1 is a screen for setting the processing information of the lens, and FIG. 19-2 is a simulation screen of the positional relationship between the lens and the beveling grindstone. The simulation screen of the positional relationship is shown in FIG. 19-3 in addition to FIG. 19-2, in which the top of the bevel, the bottom of the bevel, and the edge of the edge are shown in a straight line so that the position of the edge is easy to see. FIG. 19-4 in which the positions of the skirt and the edge are displayed up to the vicinity of the measurement position can also be adopted. These display methods may be selectively switched as needed.

(3) Electric Control System of Entire Apparatus The electric control system of the present embodiment having the above-described mechanical configuration will be described.

 FIG. 20 is an electric block diagram of the entire apparatus.

The main operation control circuit is constituted by, for example, a microprocessor, and its control is controlled by a sequence program stored in the main program. The main operation control circuit can exchange data with an IC card, an optometry system device, etc. through a serial communication port, and exchanges data with the tracer operation control circuit of the lens frame and template shape measurement unit.
Perform communication.

The display unit 3, the input unit 4, and the audio reproducing device are connected to the main operation control circuit.

In addition, each photo switch unit such as photo switches 504 and 505 for measurement, a photo end switch for detecting a process end state, and micro switch units for cover opening / closing, processing pressure, and lens chuck are also connected to the main arithmetic control circuit. I have.

Potentiometer 50 for measuring the shape of the lens to be processed
6 is connected to the A / D converter, and the converted result is input to the main operation control circuit. The measurement data of the lens which has been processed by the main processing control circuit is stored in the lens / frame data memory.

Carriage moving motor 714, carriage vertical motor 72
8. The lens rotation shaft motor 721 is connected to the main arithmetic circuit via a pulse motor driver and a pulse generator. The pulse generator is a device for receiving a command from the main arithmetic circuit and controlling how many pulses are output at a frequency of each Hz to each pulse motor, that is, the operation of each motor.

The processing pressure motor 733, the lens measurement motor 503, and the respective motors for opening and closing the cover are driven by a drive circuit instructed by the main operation control circuit.

The grindstone motor 65 and the feedwater pump motor are driven by an AC power supply, and their rotation and stop are controlled by a switch circuit controlled by a command from a main arithmetic control circuit.

Next, the lens frame and the template shape measuring unit will be described.

Potentiometer to measure the shape of lens frame and template
Outputs of the potentiometers 2130 and 2134 and the potentiometer 2046 for measuring the rim thickness of the frame are connected to an A / D converter, and the converted result is input to a tracer arithmetic control circuit. Each microswitch unit such as a microswitch for frame confirmation is also connected to the tracer arithmetic control circuit.

The tracer rotation motor 2107 is controlled by a tracer arithmetic control circuit via a pulse motor driver. In addition, tracer moving motor 2152, frame fixed solenoid 2064,
The probe fixing solenoid 2164 is driven by each drive circuit instructed by the tracer operation control circuit.

The tracer operation control circuit is constituted by, for example, a microprocessor, and its control is controlled by a sequence program stored in a program memory.

Further, the measured shape data of the lens frame and the template are temporarily stored in the trace data memory and transferred to the main arithmetic control circuit.

(4) Operation of the Entire Device Next, the operation of the lens grinding device will be described based on the flowchart of FIG.

<Step 1-1> After the main switch 400 shown in FIG. 18 is turned on, a frame or template is first set on the frame or template holding unit, and tracing is performed by the trace switch 416.

<Step 1-2> The PD value and the astigmatic axis of the wearer are input. For template measurement, also enter the FPD value. In addition, the perspective switch 406 sets whether the input PD is distant or near. The setting state is displayed on the display of the display unit 3. Here, after a distant PD is input in a state set to distant, if the distance is changed to near by the near / far switch 406, it is converted to a near PD by the following equation.

l is the required working distance, 12 is the distance between the corneal vertices of Japanese, and 13 is the distance between the corneal vertex and the rotation point.

If the distance is changed after the near PD is input in the near state, it is converted to the far PD by the following formula.

Details of the conversion are described in JP-A-63-82621.

In addition, the upper and lower layouts are set to the set values previously input in the above-described reference value setting for each of the near and far sides. If the worker wants to change the value,
The change can be made by a (+) switch 408 and a (-) switch 409. At this time, the PD can also be changed.

<Step 1-3> Based on the radial information and FPD value of the frame or template obtained in step 1-1 and the PD vertical layout information input in the previous step, coordinate conversion is performed to a new coordinate center by the above-described method. , New radial information (r _s δ _n , r _s θ _n ) is obtained and stored in the frame data memory.

<Step 1-4> The operator determines the material of the lens to be processed and determines whether it is a glass lens or a plastic lens by using a lens changeover switch.
At 402, a frame switch 403 is used to determine whether the frame is a metal or a cell, an R / L switch 405 is used to determine whether the processing lens is a right eye or a left eye, and a mode switch 404 is used to determine whether flat processing or beveling is performed. The lens processing size is set based on the set value previously input in the reference value setting for each of the eight combinations depending on whether the lens is plastic or glass, the frame is cell or metal, and the mode is bevel or flat.

To change the set value, press the (+) switch 40
It can be changed by the 8, (-) switch 409. If the R / L designation of the processing lens is the same as the measurement side at the time of frame measurement, the data is used as it is, but if different, the data is inverted left and right and used.

<Step 1-5> The lens is chucked by rotating the motor 706 by the switch 413 for opening and closing the lens chuck. At this time, if the lens has directionality such as an astigmatic axis, chucking is performed with the axial direction directed toward the center of rotation of the grindstone.

<Step 1-6, Step 1-7> If there is no abnormality in the above steps, the start switch 41
Press 1 to start.

Upon confirming that the start switch 411 has been pressed, the main arithmetic control circuit performs processing correction (grinding wheel diameter correction).

Here, point a is the grinding wheel rotation center, point b is the lens processing center,
R indicates the grinding wheel radius, LE indicates the frame data, and L indicates the distance between the grinding wheel rotation center and the lens processing center. Here, the radial information (r _s δ _n , r _s θ _n ) is read from the frame data memory, and the following calculation is performed.

Astigmatic axis except when the 180 ° offset only r _s theta _n the difference, using the r _s θ _'n instead of r _s θ _n.

Next, the radial information (r _s δ _n , r _s θ _n ) is rotated around the machining center by a small arbitrary angle, and the same calculation as in the previous equation is performed.

Let the rotation angle of these coordinates be _{ｉ i} (i = 1, 2,..., N) and ξ
_i rotate sequentially 360 ° until than ξ _n. Each ξ _i
The maximum value L _i of L in, the r _s θ _n at that time and Θ _i. Also, (L _i , ξ _i , Θ _i ) (i = 1, 2,..., N) is used as processing correction information and stored in the frame data memory.

<Step 2-1> Here, if the designation in step 1-4 is the beveling mode, the process proceeds to step 2-2, and if the designation is the flat mode, the process proceeds to step 3-1.

The main arithmetic control circuit when <Step 2-2> is specified beveling mode, a pulse generator, via a pulse motor driver to rotate the lens rotating shaft motor 721, r _s θ _n is the grindstone center of rotation The lens shafts 704a and 704b are rotated to face.

Next, the carriage is rotated by the motor 714 in the same manner,
After moving to the measurement reference position at the left end of the carriage stroke, the motor 728 is rotated to change L to the measurable position.

Thereafter, the lens edge position on the line of the radial information is measured using the above-described unprocessed lens shape measuring mechanism. The lens front edge position determined arbitrarily to rZ _n, the lens rear surface edge position and LZ _n. This edge information _{(lZ n, rZ n) (} n = 1,2, ......, N)
And this is stored in the frame data memory.

If it is determined that there is a portion where the lens outer diameter is smaller than the lens diameter, it is determined that a lens having a desired lens frame shape cannot be obtained, a warning is displayed on the display unit display, and execution of the subsequent steps is stopped. I do.

<Step 2-3> Koba information (lZ _n, rZ _n) obtained in step 2-2 Request front curve and back curve from.

First, the radial information (r _s δ _n , r _s θ _n ) is converted into rectangular coordinates (X _n , Y _n )
Convert to The arbitrary four points (X ₁ , Y ₂ ), (X ₂ , Y ₂ ),
Each edge information (lZ ₁ , r ₃ ) of (X ₃ , Y ₃ ) and (X ₄ , Y ₄ )
First, the front curve and its center are obtained from (Z ₁ ), (lZ ₂ , rZ ₂ ), (lZ ₃ , rZ ₃ ), (lZ ₄ , rZ ₄ ).

Here, (a, b, c) indicates the center coordinates of the curve, and R indicates the curve radius.

here, Next, the back curve and its center are obtained by replacing all lZ with rZ. A bevel curve is obtained based on these information.

If the bevel curve is set to the manual compulsory mode, the process proceeds to step 4-1.

The bevel curve is a curve drawn by the vertex of the V part of the outer periphery processed for lens framing.In general, it is desirable to follow the front curve, but if the bevel curve is too steep or gentle, the curve There is inconvenience in inserting. Therefore, the bevel curve forms the same curve as the front curve when the front curve value is within a predetermined width. The position of the top of the bevel is a position shifted a certain amount rearward from the edge position on the front surface of the lens. The center of the curve is placed on the line connecting the curve center of the front curve and the curve center of the rear curve.

If the bevel curve exceeds a certain width, the edge information (lZ
_n , rZ _n ) Seek yZ _n from. At this time, if R = 4, the edge thickness is 4: 6.
It is equal to standing in the ratio of

If a curve along the front curve is possible, the data is (r _s θ _n , ylZ _n ), and if not, the data obtained as R = 4 is (r _s θ _n , y ₄ Z _n) ) Is bevel data.

In any case, it is compared whether the temporary bevel data falls within a certain range with respect to the frame curve of the frame, and the data is corrected so as to fall within this range.

When the edge thickness is large, it may not be necessary to stand at a ratio along the front curve of the lens. At this time, the bevel data is set along the frame curve.

<Step 2-4> The bevel shape obtained in the above step is displayed on the display unit 3.

The display displays the radius vector information _{(r s δ n, r s} θ n) from the frame shape, further processing center for displaying the rotation cursor 30 around the. Cross-sectional shape at the edge of the rough-finished and unfinished lens 32 at the position where this cursor and frame shape touch
The beveled grinding wheel shape 32-2 is superimposed on -1 and displayed on the left side of the panel. The display shape of the edge of the lens before finishing processing is obtained based on the detected edge position, and the display position of the beveled whetstone is based on the bevel data because the whetstone is given as having a given shape. Can be determined. The cursor rotates to the right while pressing the (+) switch and to the left while pressing the (-) switch. The cursor always shows the positional relationship between the cross-sectional shape 32-1 before lens finishing and the beveling grindstone at that position. indicate.

When the rotation cursor is at the position indicated by the rim thickness measurement position mark 31, the rim position mark 33 is located at the lower left of the positional relationship between the cross-sectional shape 32-1 before lens finishing and the beveling grindstone.
Is displayed.

The position of the bevel is a position where the front surface of the lens has a certain relationship with the front surface of the rim based on the measured rim thickness.

<Steps 2-5 and 2-6> If there is no problem after confirming the bevel curve, the processing is started by restarting with the start switch 411 again.

According to the settings in Steps 1-4, the carriage is moved by the motor 714 so that the lens to be processed is placed on the rough grinding wheel 60b for plastic if the lens is plastic, or on the rough grinding stone 60a for glass if the lens is glass.

Processing correction information read from the frame data memory the distance L between the grinding wheel rotational center and the lens processing center by a motor after rotating the grinding wheel _{(L i, ξ i, Θ} i) is moved to L ₁ of the. When that time processing end photoswitches 727 rotates the angle waiting to be ON until xi] ₂ is at the same time moving the L to L _2.

The above operations are continuously performed (L _i , ξ _i ) (i = 1,2,...,
N). This allows the lens to obtain the radial information (r _s
δ _n , r _s θ _n ).

<Steps 2-7, 2-8, 2-9> After the lens is detached from the grindstone by the motor 728, the lens is moved onto the beveled grindstone by the carriage moving motor 714.

Then, the processing correction information _{(L i, ξ i, Θ} i) and obtained by converting the beveling data YZ _i from the bevel data _{(r s δ n, ylZ n} ) or _{(r s δ n, ykZ n} ).

Conversion is the first _{Θ i = r s θ n r} s θ n a i = 1,2, ...
…, N in order. Stored again sequentially selecting it the bevel position YlZ _n or YKZ _n beveling information _{(L i, ξ i, Z} i) as Z _i after re in the form of the frame data memory for r _s theta _n at that time .

Bevel motor 7 of the motor 728 is L _i on the basis of this information
21 is a motor 714 xi] _i, respectively Z _{i i} = 1,2, ......, processed while at the same time controlling the order of N.

<Step 3-1> When the grinding mode is the flat processing mode, the processing is performed on the plastic rough grindstone 60b if the lens is plastic or the glass rough grindstone 60a if the lens is glass according to the setting in step 1-4. The carriage is moved by the motor 714 so that the lens comes. Processing correction information read the distance L between the grinding wheel rotational center and the lens processing center from the frame data memory by the motor 728 from rotating the grinding wheel _{(L i, ξ i, Θ} i) moves to L _i among. When that time processing end photoswitches 727 rotates the angle waiting to be ON until xi] ₂ is at the same time moving the L to L _2. The above operation is continuously performed based on (L _i , ξ _i ) (i = 1, 2,..., N). Thus the lens is processed into the shape of the radius vector information _{(r s δ n, r s} θ n).

<Steps 3-2 and 3-3> After the lens is separated from the grindstone by the motor 728, the lens LE is beveled by the carriage movement motor 714 and the beveled grindstone 60c.
Move over the flat part of. Here, the outer periphery of the lens LE is finish-processed by the same method as in step 2-8 and thereafter.

<Step 4-1> In the manual forced mode, one of the following three methods is selected to specify a bevel curve.

(A) Specify the bevel position with respect to each edge for any four points on the lens shape.

(B) The bevel position and the value r of the bevel curve for each edge are specified for any three points on the target lens shape.

(C) For an arbitrary point on the lens shape, a bevel position with respect to the edge and a curve value r of the bevel curve are designated. At this time, it is assumed that the center point of the bevel curve is on a line connecting the center point of the lens front curve and the center point of the boxing system on the front surface of the lens.

On the other hand, in order to set the bevel position at the specified point, unless the shape of the edge is accurately displayed, a problem occurs due to the lens curve and the inclination of the bevel grindstone, particularly in a portion where the edge is thin.

For this reason, at the designated points as shown in FIG. 22-1, the positions of point A on the front surface of the lens and points D and E on the rear surface of the lens are measured. This is because, for the front surface of the lens, the edge of the edge is calculated using the calculated value of the lens curve obtained in step 2-3, but the rear surface may have a toric surface.
Measure the points.

In FIG. 22-1, the distance ΔZ between AB can be obtained by the following equation as shown in FIG.

The radius of the front curve is R, the coordinates of point A are (X, Y, Z), the coordinates of point B are (X ', Y', Z '), and the coordinates of the center of the front curve are (a, b, c). From the equation (Xa) ² + (Y−b) ² + (Z−c) ² = R ^{2 of} the sphere Therefore From the value of ΔZ, a straight line BC shown in FIG. 22-2 can be approximately obtained.

Since points D and E have been determined for the rear surface, a straight line DE
Is approximated as a straight line EF in FIG. 22-2.

The edge thickness is obtained from the measurement data at points A and D.

By the above calculation, a realistic bevel cross section display as shown in FIG. 22-2 can be performed.

At this time, the bevel YA moves on the position BE,
The bevel position can be set freely.

<Step 4-2> In this step, (A) selected in step 4-1
Or (b) or (c) is calculated.

In the case of (a), the method used in step 2-3 is similarly used. In other words, the center of the curve obtained from any four points (a, b,
c) Assuming that a point to be obtained from the radius r is (X, Y, Z), this is applied to (X−a) ² + (Y−b) ² + (Z−c) ² = r ² , Then, Zn at each point (Xn, Yn) (n = 1, 2, 3,... N) on the target lens shape is obtained, and data for beveling is created.

In the case of (b), the bevel position is specified for any three points on the target lens shape.
In a straight line perpendicular to the plane including the circle, the distance from the three points is a value 523 / Crv (mm) set by the curve value Crv.
Is used as the center of the bevel curve.

Data for beveling is created by this center point and the method (a) described above.

In the case of (c) If the center point of the front curve of the lens is (x ₂ , y ₂ , z ₂ ), the radius is r, and the point on the front of the boxing system is (x ₁ , y ₁ , z ₁ ), Is required. Here, x ₁ is the layout of the X-axis direction (horizontal direction), y ₁ is a layout of the Y-axis direction (vertical direction).

Centered on the line connecting these two points, bevel curve value Cr
v The sphere bevel setting position of the set r = 523 / Crv (mm) (x a, y a, z a) the center coordinates of the sphere that passes through (a, b, c)
Is After all Is required.

Data for beveling is created by this center point and the method (a) described above.

After creating the beveling data, the process proceeds to step 2-5.

Such a description is a principle explanation of the operation, and it goes without saying that various changes can be made depending on the degree of automation.

Although one embodiment of the present invention has been described above, it is obvious to those skilled in the art that the embodiment can be easily modified under the same technical idea as the present invention, and these also include the present invention. Needless to say.

[Effects of the Invention] As described above, according to the present invention, it is possible to know the positional relationship between the lens and the beveling grindstone before the beveling, so that, in addition to the position of the bevel to be formed, the suitability of the bevel and change of the bevel position Is easier to determine.

[Brief description of the drawings]

1 is a perspective view showing the overall configuration of a lens grinding apparatus according to the present invention, FIG. 2 is a cross-sectional view of a carriage, FIG. 3-a is an arrow view A showing a carriage driving mechanism, and FIG. Is the third
FIG. 4 is a cross-sectional view taken along line BB of FIG. A, FIG. 4 is a diagram for explaining the principle of the apparatus, FIG. 5 is a perspective view showing a lens frame and a template shape measuring unit according to the present embodiment, and FIG. Frame holder 2000A
FIG. 6-2 is a detailed view of the holding section, FIG. 6-3 is a view for explaining a mechanism for holding the lens, and FIG. 6-4 is a housing 2001.
Fig. 6-5 is a diagram illustrating a rim thickness measuring mechanism, and Fig. 6-6 is a diagram illustrating a frame fixing mechanism. FIG. 7-1 is a plan view of the measuring section, FIG. 7-2 is a sectional view taken along line CC of FIG. 7, FIG. 7-3 is a sectional view taken along line DD, and FIG.
FIG. 4 is a sectional view taken along the line EE. Fig. 8-1 and Fig. 8-
2 is a diagram illustrating a measuring method, FIGS. 9-1 and 9-2 are diagrams illustrating the movement of the tracing stylus in a vertical direction, and FIG. 10 is a diagram illustrating a coordinate conversion. FIG. 11 is a schematic diagram of the entire shape measuring unit of the raw lens, FIG. 12 is a cross-sectional view of the shape measuring unit of the raw lens, and FIG. 13 is a plan view of the shape measuring unit of the raw lens. FIG. 14 is an explanatory view showing the operation of the spring and the pin. FIG. 15 is a diagram showing the correspondence between the signals of the photoswitch 504 and the photoswitch 505, FIG. 16 is a diagram for measuring the lens radius, FIGS. 17-1, 17-2, and 17-3. FIG. 4 is a diagram illustrating a measurement operation of a measurement unit. FIG. 18 is an external view of a display unit and an input unit of the present embodiment, FIG. 19-1 is an example of a display screen for setting lens processing information, and FIG. 19-2 is an example of a display screen of a bevel simulation. is there. In addition, 19-3
FIG. 19D is another example of the bevel simulation display screen. FIG. 20 is an electric block diagram of the entire apparatus. FIG. 21 is a flowchart for explaining the operation of the apparatus. FIG. 22-1 is a partial cross-sectional view of the lens end face, FIG. 22-2 is a view showing a screen display in the manual forced mode, and FIG. 23 is a view showing a calculation method when the screen is displayed. 2 ... Lens frame and template shape measurement device 3 ... Display unit 4 ... Input unit 5 ... Lens shape measurement device 6 ... Lens grinding unit 7 ... Carriage unit

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B24B 9/14 B23Q 17/00 B23Q 17/20

Claims (1)

(57) [Claims] 1. A spectacle lens grinding machine for framing a spectacle lens, wherein a shape data input means for obtaining shape data of the spectacle frame, and a feeler contacting a front surface and a rear surface of the spectacle lens based on the shape data of the spectacle frame. Detecting means for detecting the contact position thereof, a bevel trajectory calculating device for obtaining a bevel trajectory to be formed based on the detection result of the detecting means, and a contour of the spectacle lens after processing based on the shape data of the spectacle frame. At the specified position on the contour of the spectacle lens, the shape of the edge of the spectacle lens before finishing is displayed based on the detection result of the detection means, and the beveled grindstone is displayed based on the bevel locus. Display means for displaying a position at the end of the beveling of the eyeglass lens with respect to the edge of the eyeglass lens. Machine.