JP2002355741A - Lens grinding method and lens grinding apparatus - Google Patents

Abstract

(57) [Summary] The rotation speed of the lens rotation axis of the spectacle lens, the control speed of the axial relative position between the lens rotation axis and the grinding wheel axis, or the control speed of the distance between the lens axis and the grinding wheel axis is mechanical. Check if the speed limit has been exceeded, and if so, modify at least one of those speeds,
Provided is a lens grinding method and a lens grinding apparatus capable of grinding an eyeglass lens at a rotation speed in consideration of an actual mechanical limit speed. A rotational speed of the lens rotating shafts 23 and 24 for rotating the eyeglass lens ML, and control speed of the relative axial position between the lens rotating shaft and the grinding wheel axis, the lens axis O ₂ and the rotary shaft (wheel spindle) O ₁ and a step of determining at least one of the center distance control speed of the steps of the speed obtained is checked whether or not exceed the mechanical limit speed, if it exceeds one of their velocity at least A lens grinding method and a lens grinding apparatus having a step of correcting one.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention adjusts the distance between a lens rotating shaft for holding an eyeglass lens and rotating, and a grinding wheel rotating shaft for grinding the eyeglass lens into a lens shape such as an eyeglass frame. The present invention relates to a lens grinding method and a lens grinding apparatus for grinding a spectacle lens, and more particularly to a rotational speed of a lens rotating shaft for rotating the spectacle lens or a relative moving speed in the axial direction between the lens rotating shaft and the grinding wheel shaft. Alternatively, the present invention relates to control of an inter-axis distance change speed between a lens axis and a grinding wheel axis.

[0002]

2. Description of the Related Art Conventionally, as a lens grinding apparatus, a carriage provided with a front end pivotally movable about a rear end thereof and capable of being driven to move in the left-right direction, a front end extending in the left-right direction and having the front end of the carriage. A pair of lens rotating shafts held by the lens, a lens shaft rotating drive motor for rotating the lens rotating shaft, an elevating drive motor for vertically moving the front end of the carriage, and a lens rotating shaft disposed below the lens rotating shaft. There is a grinding wheel provided with a grinding wheel, and a grinding wheel drive motor for rotating the grinding wheel.

In such a lens grinding apparatus, a lens to be processed (an unprocessed circular eyeglass lens) is held between a pair of lens rotation shafts, and the lens axis rotation motor is used to generate eyeglass shape data (glasses). θi, ρi) based on the rotation angle θi, and controls the elevation drive motor to move the radii ρi of the lens-shaped data (θi, ρi) of the glasses (glasses).
, The front end of the carriage, the lens rotating shaft, and the lens to be processed are integrally moved up and down in accordance with the rotation angle θi, and the peripheral edge of the lens to be processed is ground by the grinding wheel. Thereby, the distance between the axis of rotation of the lens and the grinding wheel at the rotation angle θi is finally set to (the moving radius ρi + the radius of the grinding wheel).

By the way, the grinding point of a lens to be processed by such a grinding wheel is often located at a position deviated from an axis connecting the axis of rotation of the lens and the axis of rotation of the grinding wheel. Changes depending on the target lens shape.

[0005] For this reason, the present applicant has filed Japanese Patent Application No.
In Japanese Patent No. -317056, when an angle between a processing radial line connecting the processing point of the lens to be processed and the axis of the lens rotation axis and an inter-axis line is defined as a processing angle, the processing angle is a lens shape such as a frame shape. We applied for a method of obtaining the control speed between each machining point from the change.

[0006]

When this concept is used, the lens rotation speed for rotating the lens to be processed and the lens to be processed are brought into contact with the grindstone and the contact position is moved at a constant speed. The control speed at each point of the lens shape obtained by synthesizing with the contact angular velocity to be changed varies depending on the ratio setting of each speed or is affected by the lens shape, but actually changes at that speed When performing the control, it is necessary to consider limitations in mechanical control such as a stepping motor for rotating the lens to be processed and a motor for controlling the distance between the lens axis and the grinding wheel axis.

Therefore, in the present invention, the rotation speed of the lens rotation axis of the spectacle lens, the control speed of the axial relative position between the lens rotation shaft and the grinding wheel axis, or the control speed of the distance between the lens axis and the grinding wheel axis is mechanical. Check if the speed limit has been exceeded, and if so, correct at least one of those speeds and grind the eyeglass lens at a rotational speed that takes into account the actual mechanical limit speed It is an object of the present invention to provide a lens grinding method and a lens grinding apparatus which can perform the method.

[0008]

In order to achieve the above object, the present invention is directed to controlling the rotation speed of a lens rotating shaft for rotating a spectacle lens and the relative position of the lens rotating shaft and the grinding wheel shaft in the axial direction. A step of determining at least one of a speed and an inter-axis distance control speed between the lens axis and the grinding wheel axis; and a step of checking whether or not the determined speed exceeds a mechanical limit speed. Correcting at least one of these speeds.

In order to achieve the above-mentioned object, a second aspect of the present invention provides a lens rotating shaft for rotating a spectacle lens, a grinding wheel shaft for grinding a spectacle lens, and a lens rotating shaft and a grinding wheel shaft. In a lens grinding apparatus having an axial control means for controlling an axial relative position and an inter-axis control means for controlling an inter-axis distance between a lens rotation axis and a grinding wheel axis, a rotation speed of a lens rotation axis And, the control speed of the axial relative position between the lens rotation axis and the grinding wheel axis, and at least one of the inter-axis distance control speed between the lens axis and the grinding wheel axis are determined, and the determined speed exceeds the mechanical limit speed. It is characterized in that the lens grinding apparatus has arithmetic control means for checking whether or not the speed has been exceeded and, when it exceeds, correcting at least one of the speeds.

[0010]

Embodiments of the present invention will be described below. [Summary of the Invention] The present invention basically has the contents described in the following (1.1) to (1.5). [Summary] The present invention basically has the contents described in the following (1.1) to (1.5). (1.1) When there is a finite number of pieces of radial information of the frame shape, the radial diameter of the lens is directed toward the center of the grinding wheel. In order to represent this direction, the direction with respect to the rotation reference position when the lens shape is expressed in the polar coordinate system is called a rotation angle, and the direction with respect to the rotation reference position when the lens shape in contact with the grindstone is expressed in the polar coordinate system at that time. The angle between the two is called the contact angle, and the angle between the two is called the machining angle. Here, considering the state where the vertices are in contact and the state where the sides are in contact, in the state where the vertices are in contact, while the rotation angle changes greatly,
The contact angle does not change, and as a result, the machining angle changes with a change in the rotation angle. On the other hand, when the sides are in contact, the change in the contact angle is greater than the change in the processing angle, and the contact angle overtakes the processing angle across the midpoint of the side. Become. Similarly, the machining angle is 0 at the midpoint of the side, but before and after the machining angle is in the opposite direction. The rotation angle represents the rotation of the lens during processing even when considering the entire spatial coordinate system including the grindstone, but the part where the contact angle does not change while the rotation angle changes by the unit angle Conversely, a portion where the contact angle greatly changes occurs. Even if the rotation angle changes, the fact that the contact angle does not change means that even if the lens is rotated, there is no change in the position in contact with the grindstone, and as a result, the same position is machined for a long time It will be. In such a part, it is necessary to speed up the rotation to avoid waste. Conversely, in a part where the contact angle greatly changes with respect to the rotation angle, the amount of rotation increases, and Is moved, and as a result, sufficient processing by the grindstone does not proceed. Until now, the control data (X direction) has been obtained using the so-called ρL conversion, but in the ρL conversion, the L data (X direction) is determined based on the rotation angle. This L
In the process of obtaining the data, the processing angle and the ρ data at that time were used for calculating the L data. Since the contact angle is located at a position separated from the rotation angle by the processing angle, a change in the contact angle can be seen by looking at this change. This part is internal information. As a method of realizing this idea, consider the change in each part of the rotation angle and the contact angle, and consider the ratio of each change. That is, the contact angle ratio = (change in contact angle) / (change in rotation angle). If the rotation speed is proportional to the reciprocal of this ratio, contact will be constant regardless of which part is captured. Since there is a portion where the change in the contact angle is almost 0 to a very large portion, the change in the contact angle ratio is large. This reciprocal can vary from almost zero to infinity and cannot be completely proportional. (1.5) In order to overcome this, the rotation speed of each part is determined by combining a part for stabilizing contact and a part for simple rotation. Rotation speed = contact stable part + simple rotation part By changing this composition ratio according to various processing conditions (materials, processing steps), the lens rotation speed is more positively changed. (1.6) In the embodiment of the present invention, the pulse motor is used, but there is a limit speed that can be output according to the load, and the speed (rotation time per rotation) and the speed change can be arbitrarily determined based on the above principle. Although the degree can be changed, if it is applied as it is, it will not be in control because it does not match the actual speed limit.

In the case where the rotation is controlled using a servo, there is also a limit speed.

An important point in realizing this control is that at least two axes (the control axis for rotating the lens rotation axis and the axis for controlling the distance between the machining wheel and the lens axis) are aligned. Simultaneous control is necessary, and when performing the beveling control, the Y-axis control is further added.
Simultaneous control of axes is required. There is a need to control any of these axes without exceeding the limit speed.

[0013] Each motor axis has a critical control speed. In a pulse motor, the self-starting frequency and the maximum operating frequency correspond to this. In general, it refers to an object measured without external load, so in order to use it on an actual machine,
It is necessary to consider external load. Have a table as data determined by the rotational speed and the speed ratio set control speed between the points for each control axis, the acceleration limit A _{b ase} of with the respective axes, make modifications to the speed between points . The correction is the speed S _n between some points _n
Assuming that the speed between the next points is S _{n + 1} , when shifting from point n to point n + 1, (S
_Since the acceleration becomes ( _{n + 1− Sn} ) / (1 / _{Sn + 1} ), it is determined whether the acceleration is equal to or less than the limit acceleration. At this time, if the acceleration is equal to or higher than the limit acceleration, the higher speed (S _{n + 1} ) is changed to the speed determined by the following equation. new S _{n + 1} = A _base * (1 / S _n ) This method is applied to the speed between points so that the speed between points does not exceed the acceleration limit when it changes.

After the operation is performed for a certain axis (the speed between points is greatly changed), in order to make the changed speed correspond to the control speed of the other control axes, the speed between points (other speeds) corresponding to the changed speed is obtained. Control axis) is multiplied by the ratio of new S _{n + 1} / S _{n + 1} to perform speed correction, and for one of the other axes, the change in speed between points Check that the acceleration limit of the control axis is not exceeded,
Correction is similarly applied, and speed correction is similarly performed on the uncorrected control axis by multiplying by the control speed change ratio.
The same applies to unmodified control axes.

Thereafter, the same operation is performed again until it is confirmed that the correction cannot be performed.

The method described here is based on the premise that there is a control in which all the control axes exceed the acceleration limit. However, if any of the control axes clearly does not reach the acceleration limit, , It is possible to omit the correction work for the axis. The operation of correcting by multiplying the speed ratio generated by the correction cannot be naturally omitted for all axes. The acceleration limit is mainly determined by the characteristics of the motor. Since the motor itself rotates with inertia, there is a limit speed in the high speed range. The self-starting frequency is a speed that can be reached by starting from speed 0 without an external load. [Configuration] The above will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a frame shape measuring device (lens shape) for reading lens shape information (θi, ρi) as lens shape data from a lens frame shape of a spectacle frame F, a mold plate or a lens model thereof. A lens grinding device (ball) for grinding a spectacle lens (a lens to be processed) ML from a cloth lens or the like based on the lens shape data of the spectacle frame input by transmission or the like from the frame shape measuring device; Sliding machine). Since a well-known frame shape measuring device 1 can be used, a detailed description of its configuration, data measurement method, and the like will be omitted.

<Lens Grinding Apparatus 2> As shown in FIGS. 1 to 3, an upper surface (inclined surface) 3a that is inclined toward the front side of the apparatus main body 3 is provided above the lens grinding apparatus 2. At the same time, a processing chamber 4 is formed which opens on the front side (lower side) of the upper surface 3a. The processing chamber 4 is opened and closed by a cover 5 attached to the apparatus main body 3 so as to be slidable up and down diagonally.

On the upper surface 3a of the apparatus main body 3, an operation panel 6 located on the side of the processing chamber 4, an operation panel 7 located on the rear side of the upper opening of the processing chamber 4, and an operation panel 7 A liquid crystal display 8 is provided at the rear of the lower part of the device and displays an operation state of the operation panels 6 and 7.

Further, a grinding section 10 having a processing chamber 4 is provided in the apparatus main body 3 as shown in FIGS. The processing chamber 4 is formed in a peripheral wall 11 fixed to the grinding section 10.

The peripheral wall 11 has left and right side walls 11a and 11b, a rear wall 11c, a front wall 11d, and a bottom wall 11e as shown in FIGS. Moreover, the side walls 11a,
11b, arc-shaped guide slits 11a1, 11b1
Is formed (see either FIG. 5A or FIG. 7). As shown in FIGS. 5A and 6, the bottom wall 11 e includes an arc-shaped bottom wall (inclined bottom wall) 11 e 1 extending in an arc shape from the rear wall 11 c toward the front side and below, and an arc-shaped bottom wall 11 e 1. It has a lower bottom wall 11e2 extending from the front lower end to the front wall 11d. The lower bottom wall 11e2 is provided with a drain pipe 11f extending to a lower waste tank (not shown) in proximity to the arc-shaped bottom wall 11e1.

(Cover 5) The cover 5 is made of a single sheet of glass or resin made of colorless or transparent or colored and transparent (for example, colored and transparent such as gray), and slides forward and backward of the apparatus main body 3.

(Operation Panel 6) FIG.
As shown in (A), a "clamp" switch 6a for clamping the spectacle lens ML by a pair of lens shafts 23 and 24, which will be described later, and designation and display of processing of the spectacle lens ML for the right eye and the left eye "Left" switch 6 for switching
b, "Right" switch 6c, "Wheel wheel move" switches 6d, 6e for moving the grindstone in the left-right direction, and eyeglass lens ML
"Re-finish / test" switch 6f for refinishing or trial-sliding when the finishing processing is insufficient or trial-sliding, "lens-rotating" switch 6g for lens rotation mode, and for stop mode "Stop" switch 6
h.

This is because a switch group necessary for actual lens processing is arranged at a position close to the processing chamber 4 so as to reduce the burden on the operation of the operator.

(Operation Panel 7) The operation panel 7 is shown in FIG.
As shown in FIG. 3B, a "screen" switch 7a for switching the display state of the liquid crystal display 8, a "memory" switch 7b for storing settings related to processing displayed on the liquid crystal display 8, and lens shape information ( A “data request” switch 7c for taking in θi, ρi) and a seesaw type “− +” switch 7d (“−” switch and “+” switch) used for numerical correction and the like may be provided separately. ) And a “▽” switch 7 e for moving a cursor pointer are arranged on the side of the liquid crystal display 8. Function keys F1 to F6 are arranged below the liquid crystal display 8.

The function keys F1 to F6 are used at the time of setting for processing of the spectacle lens ML.
It is used as a response / selection to a message displayed on the liquid crystal display 8 in the processing step.

The function keys F1 to F6 are used for inputting the type of lens, the function key F2 is used for inputting a processing course, and the function key F3 is used for setting processing (layout screen).
Is used for inputting a lens material, the function key F4 is used for inputting a frame type, the function key F5 is used for inputting a chamfering type, and the function key F6 is used for inputting a mirror surface.

The lens type input by the function key F1 includes "single focus", "ophthalmic prescription", "progression", "bifocal", "catalact", "pointing" and the like. In the spectacle industry, the term “character” generally refers to a plus lens having a large refractive power, and the “point” refers to a minus lens having a large refractive power.

The processing course input by the function key F2 includes "auto", "test", "monitor", "frame change" and the like.

The material of the lens to be processed input by the function key F3 includes "plastic", "high index", "glass", "polycarbonate",
"Acrylic" and the like.

The types of the spectacle frame F input by the function key F4 include "metal", "cell",
"Optil", "flat", "groove digging (thin)", "groove digging (medium)", "groove digging (thick)" and the like. Each “groove digging” indicates a bevel groove, which is a kind of beveling.

The types of chamfering input by the function key F5 include "none", "small", "medium",
There are "Large" and "Special".

The mirror surface input by the function key F6 includes "None", "Yes", "Chamfered mirror surface", and the like.

The function keys F1 to F
The mode, type, or order of No. 6 is not particularly limited. The number of keys is not limited, such as providing function keys for selecting “layout”, “under processing”, “processed”, “menu”, etc. as selection of each of tabs TB1 to TB4 described later. Absent.

(Liquid crystal display 8) The liquid crystal display 8 is switched by a "layout" tab TB1, a "processing" tab TB2, a "processed" tab TB3, and a "menu" tab TB4, and a function key F1 is provided below. Function display sections H1 to H6 corresponding to F6 to F6. still,
The colors of the tabs TB1 to TB4 are independent, and the background around each of the tabs TB1 to TB4 except for the areas E1 to E4 described later is also different.
At the same time as the selection switching of TB4, the background color is switched to the same as that of each of the tabs TB1 to TB4.

For example, the “layout” tab TB1 and the entire display screen (background) to which the tab TB1 is attached are blue,
The entire "processing" tab TB2 and the entire display screen (background) to which the tab TB2 is attached are green, the "processed" tab TB3 and the entire display screen (background) to which the tab TB3 are attached are red,
The “menu” tab TB4 and the entire display screen (background) to which the tab TB4 is attached are displayed in yellow.

As described above, each tab T which is color-coded for each operation
Since B1 to TB4 and the surrounding background are displayed in the same color, the operator can easily recognize or confirm which operation is currently being performed.

In the function display sections H1 to H6, what is necessary is appropriately displayed. When the function display sections H1 to H6 are in the non-display state, symbols, numerical values or states different from those corresponding to the functions of the function keys F1 to F6 are displayed. Can be displayed. When the function keys F1 to F6 are operated, for example, when the function key F1 is operated, the display of the mode or the like may be switched each time the function key F1 is clicked. For example, a list of each mode corresponding to the function key F1 may be displayed (pop-up display) to improve the selection operation. The list displayed during the pop-up display is represented by characters, graphics, icons, or the like.

When the “layout” tab TB1, the “under processing” tab TB2, and the “processed” tab TB3 are selected, the icon display area E1 and the message display area E are displayed.
2. It is displayed in a state divided into a numerical value display area E3 and a status display area E4. When the "menu" tab TB4 is selected, the menu is displayed as one menu display area as a whole. “Layout” tab TB1
Is selected, the "working" tab TB2 and the "processed" tab TB3 may not be displayed, and may be displayed when the layout setting is completed.

The layout setting using the liquid crystal display 8 as described above is the same as in Japanese Patent Application No. 2000-287040 or Japanese Patent Application No. 2000-290864, and a detailed description thereof will be omitted.

<Grinding Unit 10> The grinding unit 10 is fixed to the tray 12, a base 13 disposed on the tray 12, and the tray 12 as shown in FIGS. Base drive motor (axial adjusting means) 14
8 and a support portion 12a (FIG. 8)
And a screw shaft 15 that is linked to an output shaft (not shown) of the base drive motor 14 whose tip is rotatably supported. Further, the grinding section 10 includes a rotation drive system 16 for the spectacle lens ML, a grinding system 17 for the spectacle lens ML, and an edge thickness measuring system (edge thickness measuring means) 18 for the eyeglass lens ML.

(Base 13) The base 13 is
A rear support portion 13a extending left and right along a rear edge of the rear support portion, and a lateral support portion 1 extending frontward from a left end of the rear support portion 13a.
3b is formed in a substantially V shape. This rear support 1
A V-shaped shaft support 13 is provided on both left and right ends of 3a.
c and 13d are fixed, and a V-block-shaped shaft support 13e is fixed on the front end of the side support 13b.

A pair of parallel guide bars 1 extending in the left-right direction and arranged in parallel in the front-rear direction are provided in the apparatus main body 3.
9, 20 are provided. This parallel guide bar 19,
The left and right ends of the unit 20 are attached to left and right portions in the apparatus main body 3. Moreover, the parallel guide bars 19, 20
, A side support portion 13b of the base 13 is pivotally supported so as to be able to move left and right along the axial direction.

The V-grooves on the shaft supports 13c and 13d are provided with both ends of a carriage pivot 21 extending left and right. A carriage 22 is mounted on the carriage pivot 21. The carriage 22 is provided with a shaft mounting arm portion 22 that is positioned at right and left intervals and extends forward and backward.
a, 22b and left and right arms 22a, 22b
A connecting portion 22c connecting the rear ends of the connecting portions 22a and 22b;
Support projection 22d protruding rearward at the left and right center of c
From a forked shape. Note that the arm portions 22a,
22b and the continuous portion 22c are U-shaped. The peripheral wall 11 forming the processing chamber 4 between the arm portions 22a and 22b
Is arranged.

The carriage pivot 21 penetrates the support projection 22d, is held by the support projection 22d, and is rotatable with respect to the shaft supports 13c, 13d. As a result, the front end side of the carriage 22 can be turned up and down around the carriage turning shaft 21. Note that the carriage turning shaft 21 is
c, 13d, the support projection 22d may be held so as to be rotatable with respect to the carriage turning shaft 21 and immovable in the axial direction.

The carriage 22 has a pair of lens axes (lens rotation axes) 23, 24 extending right and left and coaxially holding a spectacle lens (circular unprocessed spectacle lens, that is, a circular processed lens) ML. ing. The lens axis 23 is
It penetrates the tip of the arm 22a to the left and right, and is held at the tip of the arm 22a so as to be rotatable around the axis and immovable in the axial direction. The lens shaft 24 penetrates the distal end of the arm 22b toward the left and right, and is held at the distal end of the arm 22b so as to be rotatable around the axis and adjustable in the axial direction.
Since a well-known structure is adopted for this structure, a detailed description thereof is omitted.

A guide 13f is formed integrally with the base 13, and a screw shaft (feed screw) 15 is screwed to the guide 13f. Then, the base drive motor 14 is operated, and the screw shaft 1 is
The guide portion 13f is moved forward and backward in the axial direction of the screw shaft 15 by rotating and driving the base 5, so that the base 13 is
It moves integrally with 3f. At this time, the base 13 is guided by the pair of parallel guide bars 19 and 20 and is displaced along the axial direction.

[Carriage 22] The above-described guide slits 11a1 and 11b1 of the peripheral wall 11 are formed in an arc shape around the carriage pivot 21. Opposite ends of the lens shafts 23 and 24 held by the carriage 22 are inserted into the guide slits 11a1 and 11b1. As a result, the opposite ends of the lens shafts 23 and 24 project into the processing chamber 4 surrounded by the peripheral wall 11.

FIG. 5 shows the inner wall surface of the side wall portion 11a.
As shown in FIG. 7A, a guide plate P1 having an arc shape and a hat-shaped cross section is attached, and a guide plate P2 having an arc shape and a hat-shaped cross section is attached to the inner wall surface of the side wall portion 11b as shown in FIG. ing. The guide plates P1 and P2 are formed with guide slits 11a2 'and 11b2' extending in an arc shape corresponding to the guide slits 11a1 and 11b1.

A cover plate 11a2 for closing the guide slits 11a1 and 11a2 'is disposed between the side wall 11a and the guide plate P1 so as to be movable back and forth and up and down. A cover plate 11b2 for closing the guide slits 11b1 and 11b2 '
Are provided so as to be movable back and forth and up and down. The lens shafts 23 and 24 slidably pass through the cover plates 11a2 and 11b2, respectively. Thereby, the cover plate 11
Reference numerals a2 and 11b2 are attached to the lens shafts 23 and 24 so as to be relatively movable in the axial direction.

Further, the guide plate P1 is provided with arc-shaped guide rails Ga and Gb which are located above and below the guide slits 11a1 and 11a2 'and extend along the upper and lower edges of the guide slits 11a1 and 11a2'. Arc-shaped guide rails Gc and Gd are provided above and below the guide slits 11b1 and 11b2 'and along the upper and lower edges of the guide slits 11b1 and 11b2'.

The cover plate 11a2 is guided up and down by the guide rails Ga and Gb so that it can move up and down in an arc shape.
It can be moved up and down in an arc by being guided up and down by c and Gd.

The lens shaft 23 of the carriage 22 slidably penetrates through the arc-shaped cover plate 11a2 to improve the assemblability of the lens shaft 23, the side wall 11a1, the guide plate P1, and the cover plate 11a2. The 22 lens shafts 24 slidably penetrate the arc-shaped cover plate 11b2 to improve the assemblability of the lens shaft 24, the side wall 11b1, the guide plate P2, and the cover plate 11b2.

The space between the cover plate 11a2 and the lens shaft 23 is sealed via a seal member Sa, and the cover plate 11a2 is
a and Sa are held. Further, the cover plate 11
The space between the lens shaft b2 and the lens shaft 24 is sealed via a seal member Sb, and the cover plate 11b2 is
4 is held via seal members Sb, Sb so as to be relatively movable in the axial direction. As a result, the lens shafts 23 and 24 are aligned with the guide slits 11a1, 11a2 'and 11b.
When the cover plates 11a2 and 11b2 are vertically rotated along an arcuate shape along 1,11b2 ', the cover plates 11a2 and 11b2 can also move up and down integrally with the lens shafts 23 and 24. The sealing member Sa is held by the cover plate 11a2, or its peripheral edge is between the cover plate 11a2 and the side wall 11a and between the cover plate 11a2 and the guide plate P.
Alternatively, when the lens shaft 23 moves in the axial direction, the lens shaft 23 may not move in the axial direction of the lens shaft 23. Similarly, the sealing member Sb is held by the cover plate 11b2 or the peripheral portion is covered with the cover plate 11b.
2 and between the cover plate 11b2 and the guide plate P2 to prevent the lens shaft 24 from moving in the axial direction when the lens shaft 24 moves in the axial direction. Is also good.

The side wall portion 11a1 and the guide plate P1 are close together so as to be in close contact with the arc-shaped cover plate 11a2, and the side wall portion 11b1 and the guide plate P2 are close together so as to be in close contact with each other. ing.

Further, the guide plates P1, P in the processing chamber 4
2 is extended to the vicinity of the rear side wall 11c and the lower bottom wall 11e2 so that the upper and lower ends are cut around the side of the feeler 41 and near the upper side of the grinding wheel 35, so that the upper and lower sides of the guide plates P1 and P2 By opening the end into the processing chamber 4 and allowing the grinding fluid to flow along the inner surfaces of the side walls 11a1 and 11b1, the gap between the side wall 11a1 and the guide plate P1 and between the side wall 11b1 and the guide plate P2 is increased. During this time, the grinding fluid does not accumulate.

When the carriage 22 pivots up and down about the carriage pivot shaft 21 and the lens shafts 23 and 24 move up and down along the guide slits 11a1 and 11b1, the cover plates 11a2 and 11b2 also move. 24
The guide slits 11a1 and 11b
1 is always closed by the cover plates 11a2 and 11b2 so that the grinding fluid and the like in the peripheral wall 11 do not leak to the outside of the peripheral wall 11. Note that this lens axis 23,
As the lens 24 moves up and down, the spectacle lens ML approaches and separates from the grinding wheel 35.

When the spectacle lens ML is mounted on the lens shafts 23 and 24 such as the cloth lens and when the spectacle lens ML is detached after finishing the grinding, the carriage is moved so that the lens shafts 23 and 24 are located at the intermediate positions of the guide grooves 11a. 22 is positioned at the center of rotation in the vertical direction. In addition, the carriage 22 is tilted by being vertically controlled in accordance with the grinding amount of the spectacle lens ML during the edge thickness measurement and the grinding process.

(Rotary drive system 16 for lens shafts 23 and 24)
The rotation drive system 16 of the lens shafts 23 and 24
2, a lens shaft driving motor 25 fixed by a fixing means (not shown), a power transmission shaft (drive shaft) 25a rotatably held by the carriage 22 and interlocking with the output shaft of the lens shaft driving motor 25. A drive gear 26 provided at the end of the power transmission shaft 25a, and a driven gear 26a meshed with the drive gear 26 and attached to one of the lens shafts 23. In FIG. 8, a worm gear is used for the drive gear 26, and a worm wheel is used for the driven gear 26a.
Note that a bevel gear (bevel gear) can be used for the drive gear 26 and the driven gear 26a.

Further, the rotary drive system 16 includes a pulley 27 fixed to the outer end of one of the lens shafts 23 (an end opposite to the lens shaft 24), and a power transmission mechanism provided on the carriage 22. 28, and a pulley 29 rotatably held at an outer end of the other lens shaft 24 (an end opposite to the lens shaft 23). The pulley 29 is provided so as to be relatively movable in the axial direction with respect to the lens axis 24, and the carriage 2 is arranged so that the position in the axial direction does not change when the lens axis 24 is adjusted to move in the axial direction.
The movement is restricted by a movement restricting member (not shown) provided in 2.

The power transmission mechanism 28 includes transmission pulleys 28a,
28b, and a transmission shaft (power transmission shaft) 28c having transmission pulleys 28a and 28b fixed to both ends. The transmission shaft 28c is disposed in parallel with the lens shafts 23 and 24, and is rotatably held on the carriage 22 by a bearing (not shown). The power transmission mechanism 28 is connected to the pulley 2
The drive belt 28 d is stretched between the transmission pulley 28 and the transmission pulley 28 a, and the driven belt 28 e is stretched between the pulley 29 and the transmission pulley 28 b.

When the lens shaft driving motor 25 is operated to rotate the power transmission shaft 25a, the rotation of the power transmission shaft 25a is transmitted to the lens shaft 23 via the driving gear 26 and the driven gear 26a, and the lens shaft 23 is rotated. And the pulley 27 are integrally rotated. On the other hand, the rotation of the pulley 27 is controlled by the drive belt 28d, the transmission pulley 28a, the transmission shaft 28c, the transmission pulley 28b, and the driven belt 28e.
9, the pulley 29 and the lens shaft 24 are integrally rotated. At this time, the lens axes 24 and 23
Is designed to rotate integrally with the camera.

(Grinding System 17) The grinding system 17
Wheel driving motor 30 fixed to the
0 is transmitted via the belt 31 to the transmission shaft 32
And a grinding wheel shaft 33 to which the rotation of the transmission shaft 32 is transmitted, and a grinding wheel 35 fixed to the grinding wheel shaft 33. The grinding wheel 35 includes a rough grinding wheel, a bevel wheel, a finishing wheel, and the like, the symbols of which are omitted. The rough grinding wheel, beveling wheel, and finishing wheel are arranged side by side in the axial direction.

The grinding system 17 has a motor mounting case 200 mounted on the outer surface of the peripheral wall 11 as shown in FIG. In FIG. 5, illustration of the case 200 is omitted for convenience of explanation. Further, the grinding system 17
Is located inside the case 200 as shown in FIG.
, A worm gear 36a fixed to the output shaft, a cylindrical worm 37 rotatably held by the peripheral wall 11, and a worm 37.
A hollow rotating arm 38 integrally fixed to the
(A), a rotating shaft 39 whose one end is rotatably held at the free end of the rotating arm 38 and protrudes rightward from the free end as shown in FIG. As shown in FIG. 7, a grooving grindstone 40 fixed to the rotating shaft 39 is provided.

Further, as shown in FIG. 11, the grinding system 17 includes a drive motor 39a having an output shaft 39b inserted through a cylindrical worm shaft 39a, and a drive motor 39a And a power transmission mechanism 202 for transmitting the rotation of the output shaft 39b to the rotation shaft 39. The power transmission mechanism 202 includes a timing pulley 203 attached to the end of the output shaft 39 b in the rotating arm 38, a timing pulley 204 attached to the end of the rotating shaft 39 in the rotating arm 38, Pulley 20
3, 204 has a timing belt 205 stretched around.

As shown in FIGS. 5 (a) and 7, the mizobori grindstone 40 has chamfered grindstones 40a and 40b for chamfering the periphery of the spectacle lens ML, and is adjacent to the chamfered grindstone 40a. It has a trench cutter 40 c attached to the rotating shaft 39.
Further, an arc-shaped cover 38a extending rightward in FIG. 5A is attached to the rotating arm 38. The arc-shaped cover 38a covers below the chamfering grindstones 40a and 40b and the groove cutter 40c.

(Grinding Fluid Supply Structure) As described above, the bottom wall 11e of the peripheral wall 11 forming the processing chamber 4 is an arc-shaped wall 11e1.
And a lower bottom wall 11e2. This arc-shaped wall 11e1
Are formed in an arc shape with the carriage pivot 21 as the center.

Further, as described above, the peripheral wall 11 is
1c and a front wall 11d. A grinding fluid discharge nozzle 60A opening forward is attached as a grinding fluid supply means at the center in the left-right direction of the lower end of the rear wall 11c,
A grinding fluid discharge nozzle 61A protruding rearward is attached to the front wall 11d as grinding fluid supply means.
The grinding fluid discharge nozzle 60A can be provided wide so as to discharge the grinding fluid from the entire width of the rear wall 11c. In this case, even if grinding dust or the like is scattered anywhere on the arc-shaped bottom wall 11e1, the grinding dust is washed down with the grinding liquid to prevent the grinding dust from adhering to the arc-shaped bottom wall 11e1. it can.

The grinding wheel 3 is attached to the grinding fluid discharge nozzle 61A.
A first grinding fluid discharge port (first grinding fluid supply means) 63 for discharging and supplying the grinding fluid 62 so as to cover the upper part of the grinding surface 35a and the portion on the lens shaft 23, 24 side; Second grinding fluid discharge port (second grinding fluid supply means) for supplying grinding fluid 64 from the normal direction to grinding surface 35a of 35
65 are provided integrally. This grinding fluid discharge port 63,
Reference numeral 65 branches from the grinding fluid supply passage 61a.

The grinding fluid 62 is discharged from the grinding fluid discharge port 63 in an arc shape toward the rear, and the grinding fluid 62 is
It passes slightly below 3, 24 and flows downward. Here, the vertical line passing through the rotation center O of the grinding wheel 35 is assumed to be 36, and the tangent line passing through the intersection of the vertical line 36 and the grinding surface 35a is assumed to be 3
Assuming that 7, the grinding fluid 62 is discharged substantially in the same direction as the tangent line 37, that is, in the direction parallel to the tangent line 67 backward from the grinding fluid discharge port 63 as indicated by the arrow 68.

Further, the width of the grinding fluid discharge port 65 in the left-right direction is substantially the same as the width of the grinding wheel 35 in the left-right direction.
5 is formed wider than the width in the left-right direction. Thereby, a sufficient grinding liquid can be supplied to the grinding surface (peripheral surface) 35a of the grinding wheel 35.

The width of the grinding fluid discharge port 63 in the left-right direction is wider than the width of the grinding liquid discharge port 65 in the left-right direction. In addition, both left and right ends of the grinding fluid discharge port 63 protrude further than both left and right ends of the grinding fluid discharge port 65.

As described above, the width of the grinding fluid discharge port 63 in the left-right direction is made wider than the width of the grinding fluid discharge port 65 in the left-right direction, and the grinding fluid 62 is discharged at a slight distance from the grinding surface 35a. As a result, the grinding fluid 62 discharged from the grinding fluid discharge port 63 is separated from the grinding surface 35a by an interval.
The lens grinding portion (lens processing point) 69 side of 5a can be covered in a curtain shape.

By the way, in such a configuration, the grinding fluid 64 is supplied (supplied) from the grinding fluid discharge port 65 to the grinding surface 35a from the normal direction, so that the grinding fluid is supplied to the lens processing point (lens grinding portion 69). The grinding fluid 64 can be supplied sufficiently. The problem with this method is that the grinding fluid supplied to the grinding surface 35a is blown upward or backward by the rotation of the grinding wheel 35, whereby the grinding fluid scatters above and behind the grinding chamber 4 and leaks (leakage). The rear wall 11c, the lens axis 23,
24 or the like.

However, the grinding fluid 62 is supplied to the grinding fluid outlet 63.
Is discharged substantially in the tangential direction and rearward, and covers the upper part of the grinding surface 35a of the grinding wheel 35 and the lens processing point (the lens grinding part 69) in a curtain shape. At this time, since the width of the curtain-shaped grinding fluid 62 is formed wider than the width of the grinding fluid 64 discharged from the grinding fluid discharge port 65, the grinding fluid 64 discharged from the grinding fluid discharge port 65 is 35
Is prevented from scattering backward. This prevents the grinding fluid from scattering and leaking above and behind the grinding chamber 4 (leakage) and soiling the rear wall 11c, the lens shafts 23 and 24, and the like.

The tangential water supply, that is, the grinding fluid discharge port 63
Liquid 6 which is discharged in a substantially tangential direction and backward from the
2 can prevent water splashing by tangential water supply of the grinding fluid 62 and water splash prevention effect by normal water supply of the grinding fluid 64 by separating the grinding fluid 35 from the grinding surface 35a of the grinding wheel 35 so as not to come into direct contact therewith.

Since the grinding fluids 62 and 64 are supplied in two directions, tangential to the grinding wheel 35 and normal to the grinding wheel 35, the grinding fluid is supplied to the grinding surface 35a of the grinding wheel 35 and the spectacle lens ML. It can be supplied evenly. Furthermore, since one grinding fluid supply nozzle (grinding fluid supply device) 61 is provided with discharge ports 63 and 65 for supplying the grinding fluid in two directions of the tangential direction and the normal direction of the grinding wheel 35, the grinding fluid supply nozzle is provided. (Grinding fluid supply device) 61 and the entire grinding device can be reduced in size and size. <Pressure Adjusting Mechanism 45> A pressure adjusting mechanism 45 that adjusts the amount of pressure of the spectacle lens ML against the grinding wheel 35 is provided near the carriage pivot 21 of the carriage 22.

As shown in FIG. 10, the pressure adjusting mechanism 45 includes a bracket 47 fixed to the carriage 22 by screws 46, a moving element displacement motor 48 fixed to the bracket 47, and a moving element displacement motor 48. It has a screw shaft 48a interlocked with an output shaft (not shown) and a moving element 50 screwed to the screw shaft 48a (see FIG. 9). In addition, the distal end of the screw shaft 48a is rotatably held by the bracket 47, and the movable member 50 is connected to the guide rail 4 parallel to the screw shaft 48a.
At 9, it is guided in the axial direction.

Further, the pressure adjusting mechanism 45 includes three pulleys 51, 52, 53 rotatably held by the base 13.
And a pull cord 55 whose both ends are held by the mover 50 and the spring 54. The pulling string 55 is pulled by the pulley 5 so that the moving element 50 is pulled from a direction substantially orthogonal to the guide rail 49 by the pulling force of the spring 54.
The direction has been changed to 1,52,53. The other end of the spring 54 is fixed to the base 13.

The pressure adjusting mechanism 45 changes the distance from the carriage turning shaft 21 depending on the position of the movable member 50 on the guide rail 49, and the urging force on the leading end side of the carriage 22 by the pulling force of the spring 54 according to the position. In other words, it utilizes the fact that the urging pressure of the spectacle lens ML held between the lens shafts 23 and 24 on the grinding wheel 35 changes. The screw shaft 48a and the guide rail 49
Is substantially perpendicular to the lens axis 23 and the carriage pivot axis 21.

Therefore, the state of contact of the spectacle lens ML with the grinding wheel 35 is changed from the pressing direction,
By displacing the position of the moving member 50 on the guide rail 49 in accordance with a change in processing conditions such as a difference in contact area due to a change in the shape of L and a difference in edge width due to the lens power, the pulling force of the spring 54 is substantially the same. Nevertheless, the contact force per unit area can be adjusted.

As described above, since the carriage 22 is inclined from the intermediate position in accordance with the grinding amount of the spectacle lens ML, the pressure adjusting mechanism 45 is located on the inclined side. Further, since the carriage 22 is in an inclined state, even if the movable member 50 is merely a weight and the pulleys 51, 52, 53, the spring 54, and the pulling string 55 are eliminated, the attachment at the leading end side of the carriage 22 is possible. Since it is possible to change the acting force corresponding to the force, it is also possible to adjust the contact pressure of the spectacle lens ML on the grinding wheel 35 according to the position of the movable element 50 on the guide rail 49. . <Inter-axis distance adjusting means 43> By the way, as shown in FIG. 7, between the lens axes 23 and 24 and the grindstone shaft portion 33, an axis as an inter-axis distance control means disposed on the side of the processing chamber 4 is provided. The distance is adjusted by the distance adjusting means (axis distance adjusting mechanism) 43.

The inter-axis distance adjusting means 43 has the rotating shaft 34 whose axis is located on the same axis as the grinding wheel shaft 33 as shown in FIGS. The rotation shaft 34 is rotatably supported on the V-groove of the support protrusion 13e in FIG.

The inter-axis distance adjusting means 43 is connected to the rotating shaft 3.
4, a pair of parallel guide rails 57, 57 attached to the base board 56 and extending obliquely upward from the upper surface, and provided on the base board 56 so as to be parallel to and rotatable with the guide rails 57. Screw shaft (feed screw) 58, a pulse motor 59 provided on the lower surface of the base board 56 to rotate the screw shaft 58, and the screw shaft 58 is screwed and held by guide rails 57, movably up and down. 7 (not shown in FIG. 7 for convenience of illustration of other parts).

Further, the center distance adjusting means 43 is provided with
And a lens shaft holder 61 movably held up and down by the guide rails 57 and 57, and reinforcement for holding the upper ends of the guide rails 57 and 57 and rotatably holding the upper end of the screw shaft 58. A member 62 is provided.
The lens shaft holder 61 is constantly urged downward and pressed against the receiving table 60 by the weight of the carriage 22 and the spring force of the spring 54 of the pressure adjusting mechanism 45.

The inter-axis distance adjusting means 43 includes a photo sensor (finish sensor) 210 mounted on the side of the lens shaft holder 61, a light shielding plate 211 mounted on the upper surface of the pedestal 60, Light shield plate 21 attached to one end surface
2

The light shielding plate 211 always shields light emitted from a light emitting portion (not shown) of the photo sensor 210. Note that a straight line connecting the lens rotation shafts 23, 24 and the rotation shaft 34 is parallel to the guide rails 57, 57.

On the other hand, when the lowering of the lens axis holder 61 is stopped and the receiving table 60 is slightly lowered with respect to the lens axis holder 61, the light shielding by the light shielding plate 211 is released, and the light receiving portion of the photo sensor 210 (shown in FIG. ) Receives light from the light emitting section. This shielding detects that the lens L to be processed has been finished.

The side portion of the base board 56 and the reinforcing member 62
A support plate 213 is attached to the side, and an origin sensor 214 composed of a photosensor for detecting the origin in the X direction is attached to the support plate 213. When the lens L to be processed is lowered to a predetermined position (origin position in the X direction), the light shielding plate 212 shields the light of the light emitting portion of the origin sensor 214. The origin is detected.

The reinforcing member 62 is provided with an origin sensor (photo sensor) 215 for the pulse motor 59. The origin sensor 215 detects the notch 217 of the disk 216 provided at the upper end of the screw shaft 58. The number of pulses of the pulse motor 59 is counted based on the detection of the notch 217. After the disk 216 is rotated by the pulse motor 59, the notch 2
When the light source 17 opens the light shielding of the origin sensor 215 (when the origin sensor 215 detects the light of the light emitting unit (not shown)), the time is set as the origin of the pulse of the pulse motor 59 and the number of pulses is counted. is there.

By the way, the cradle 60 is positioned between the center of the rotation shaft 34 (the rotation center of the grinding wheel 35) and the lens rotation shafts 23, 24.
Will move up and down along the straight line connecting the center of.
The lens shaft holder 61 is rotatably engaged with one end of the lens rotating shaft 24. When the lens shaft holder 61 moves up and down (moves forward and backward) along the guide rails 57, 57, the front end of the carriage 22 and Lens rotation axis 23, 2
4 turns up and down around the carriage turning shaft 21. <Edge thickness measuring system 18> An edge thickness measuring system (lens edge thickness measuring device) 18 as a lens shape measuring device is shown in FIG.
(A), as shown in FIG. 7, a tracing stylus 41 provided above the rear edge of the processing chamber 4, and provided in parallel with the lens shafts 23 and 24 and one end provided integrally with the tracing stylus 41. Measuring shaft 42a and a measuring unit (probe sensing element moving amount detecting unit) 4 arranged outside the processing chamber 4 in the vicinity of the rear edge side upper portion of the side wall 11b.
2 The measurement shaft 42a penetrates the side wall 11b and protrudes into and out of the processing chamber 4. (Measurement Point 41) The measurement point 41 has the feeler holding member 100 as shown in FIGS.
It has a pair of feelers 101 and 102. The feeler holding member 100 has a continuous portion 100a extending left and right, and parallel opposing pieces 100b and 10c protruding in the same direction at both left and right ends of the continuous portion 100a. The feelers 101 and 102 are formed in a columnar shape.
It is attached so as to face the tip of the opposing pieces 100b and 100c. In addition, the tip portions of the tracing styluses 101 and 102 have inclined surfaces 101a and 1 that face the inclined portion 100a.
02a is formed. Thereby, the probe 101,
As shown in FIG. 5A, arc-shaped contact edges 101b and 102b are formed at the distal end of 102. Further, the tip 1 of the contact edge 101b, 102b of the tracing stylus 101, 102
01b1 and 102b1 are provided flush with the tips 100b1 and 100c1 of the opposing pieces 100b and 100c.

Further, as shown in FIG. 7, the feeler holding member 100 is attached to a measuring shaft 42a which penetrates the side wall 11b and extends left and right. The measurement shaft 42a is held movably to the left and right by a measurement unit 42 disposed outside the side wall 11b. The measuring unit 42 detects the amount of movement of the feeler holding member 100 to the left and right via the measuring shaft 42a.

(Control Circuit) The operation panels 6 and 7 (ie, the switches on the operation panels 6 and 7) are connected to an operation control circuit (operation control means) 80 having a CPU as shown in FIG. Have been. The operation control circuit 8
0 is connected to a ROM 81 as storage means, a data memory 82 and RAM 83 as storage means, and a correction value memory 84. In addition, detection signals from the photo sensor 210 and the origin sensors 214 and 215 are input to the arithmetic and control circuit 80.

Further, the liquid crystal display 8 is connected to the arithmetic control circuit 80 via a display driver 85, and a pulse motor driver (pulse motor drive circuit) 8
6 are connected. This pulse motor driver 86
Are operated and controlled by the arithmetic and control circuit 80, and various drive motors of the grinding section 10, that is, the base drive motor 1
4, operation control (drive control) of the lens axis driving motor 25, the rotating arm driving motor 36, the moving element displacement motor 48, the pulse motor 59, and the like. Note that a pulse motor is used as the base drive motor 14, the lens axis drive motor 25, the rotating arm drive motor 36, the moving element displacement motor 48, and the like.

Further, the grindstone drive motor 30 is connected to the arithmetic control circuit 80 via a motor driver (motor drive circuit) 86a.
The grinding wheel drive motor 39a is connected via 6b, and the grinding fluid supply pump (grinding fluid supply means) P is connected. The grinding fluid supply pump P supplies the grinding fluid filtered from a waste fluid tank (not shown) to the grinding fluid supply nozzles 60A and 61A during operation.

Further, to the arithmetic and control circuit 80, the frame shape measuring device 1 of FIG. 1 is connected via a communication port 88, and the frame shape data and lens shape data from the frame shape measuring device (ball shape measuring device) 1 are connected. Lens shape data such as data is input.

Further, the arithmetic control circuit 80 includes the measuring unit 4
2 is input.
The arithmetic and control circuit 80 controls the motor 25 for driving the lens axis, the pulse motor 59, and the like, the operation of which is controlled based on the driving pulse of the base driving motor 14 and the lens shape data (θi, ρi) from the frame shape measuring device 1. From the driving pulse and the movement amount detection signal from the measuring unit 42, the coordinate position of the front refracting surface of the spectacle lens ML (the left surface of the spectacle lens in FIG. 7) and the rear position in the lens shape data (θi, ρi) The coordinate position of the side refraction surface (the right surface of the spectacle lens in FIG. 7) is obtained, and the obtained lens shape data (θi, ρ
The edge thickness Wi is obtained by calculation from the coordinate position of the front refractive surface and the coordinate position of the rear refractive surface of the spectacle lens ML in i).

[0098] After the start of the machining control, the arithmetic and control circuit 80 reads the data from the frame shape measuring device 1 and the data stored in the storage areas m1 to m8 of the data memory 82, as shown in FIG. As shown in FIG. 14, processing control by time division, reading of data and control of layout setting are performed.

That is, the period between times t1 and t2 is T1, the period between times t2 and t3 is T2, the period between times t3 and t4 is T3,..., And the period between times tn-1 and tn is Tn. .. Tn, the control for enclosing data during the period T1, T3,.
2, T4... Tn-1. Therefore, during the grinding of the lens to be processed, the reading and storing of the next plurality of lens shape data, the reading of the data, and the layout setting (adjustment) can be performed, and the work efficiency of the data processing is significantly improved. You can do it.

The ROM 81 stores various programs for controlling the operation of the lens grinding apparatus 2, and the data memory 82 has a plurality of data storage areas. The RAM 83 also includes a processed data storage area 83a for storing currently processed data, a new data storage area 83b for storing new data, and a data storage area 83c for storing frame data, processed data, and the like.
Is provided.

The data memory 82 may be a readable / writable FEEPROM (flash EEPROM), or a RAM using a backup power supply so that the contents are not erased even when the main power supply is turned off. it can.

Next, the function of the arithmetic and control circuit 100 will be described together with its operation. (1). Lens shape information (ball shape data) (i). Request for Eyeglass Lens Shape Data When the main power is turned on from the start standby state, the arithmetic and control circuit 80 determines whether or not there is a request from the frame shape measuring device (frame reader) 1 to read lens shape information (eye shape data). Judge.

That is, the arithmetic control circuit 80 operates the operation panel 6
It is determined whether the "data request" switch 7c is pressed. When the "data request" switch 7c is pressed and a data request is made, the data of the lens shape information (θi, ρi) is read from the frame shape measuring device 1 into the data reading area 83b of the RAM 83. The read data is stored (recorded) in any of the storage areas m1 to m8 of the data memory 82, and a layout screen is displayed on the liquid crystal display 8. Here, [i] of the lens shape information (θi, ρi) is i = 0, 1, 2, 3,.
Becomes (ii) Calculation of Edge Thickness Corresponding to Lens Shape Information Next, the arithmetic and control circuit 80 controls the operation of the measuring unit 42 so that the feeler 101 can operate the eyeglass lens (lens to be processed) M
L is brought into contact (contact) with the front refracting surface of L, and the operation of the lens axis driving motor 25 and the pulse motor 59 is controlled based on the lens shape data (θi, ρi).
The feeler 101 and the front refractive surface of the spectacle lens ML are relatively moved in contact with each other based on the lens shape data (θi, ρi). At this time, the feeler 101 is moved right and left in accordance with the curvature of the front refracting surface, and the amount of the movement to the left and right is measured by the measuring unit 42 via the measuring axis 42a. The measurement signal from the measurement unit 42 is input to the arithmetic control circuit 80, and the arithmetic control circuit 80 determines the shape of the front refractive surface of the spectacle lens ML in the lens shape data (θi, ρi) based on the measurement signal from the measurement unit 42. Find the coordinate position.

Similarly, the arithmetic and control circuit 80 controls the operation of the measuring section 42 so that the feeler 102 comes into contact with the front refracting surface of the spectacle lens (lens to be processed) ML, and the lens shape data (θi , Ρi) based on the lens shape data (θi, ρi) by controlling the operation of the lens axis driving motor 25 and the pulse motor 59 based on the lens shape data (θi, ρi). And move it. At this time, the feeler 101 is moved right and left in accordance with the curvature of the rear refraction surface, and the amount of this movement to the left and right is measured by the measurement unit 42 via the measurement axis 42a. The measurement signal from the measurement unit 42 is input to the arithmetic control circuit 80, which calculates the rear refractive surface of the spectacle lens ML in the lens shape data (θi, ρi) based on the measurement signal from the measurement unit 42. Find the coordinate position of.

A more specific method for obtaining such a coordinate position of the front refracting surface and a coordinate position of the rear refracting surface is disclosed in Japanese Patent Application No. 200-200.
No. 1-30279 can be employed, and a detailed description thereof will be omitted.

Then, the obtained lens shape data (θ
The edge thickness Wi is calculated from the coordinate position of the front refraction surface and the coordinate position of the rear refraction surface of the spectacle lens ML in (i, ρi).

After that, the arithmetic and control circuit 80 responds to the lens shape data (θi, ρi) from the data such as the pupil distance PD and the frame geometric center distance FPD based on the prescription of the spectacle lens, the amount of upward shift, and the like. The processing data (θi ′, ρi ′) of the spectacle lens ML to be processed is obtained and stored in the processing data storage area 83a. (iii). Lens shape information as computed described above deviation angle dθ _n (θi, ρi) of [i "
Is i = 0, 1, 2, 3... Q. In this embodiment,
For example, assuming that q is 1,000, the rotation angle Δθ is 0.36 of 1 / 1,000 (360 ° / 1,000) of one rotation.
゜The rotation speed is not limited to this, and can be set to 2,000 to 100,000 of one rotation.

Here, if “i” in the lens shape information (θi, ρi) is replaced with “n” and the radius at the _n-th radius angle _n Δθ is ρ _n , the radius ρ _n and the radius Diameter _n Δθ
Is the spectacle lens shape data (ρ _n , _n Δθ) [where n =
0, 1, 2, 3... J]
Is to be remembered. Using this spectacle lens shape data (ρ _{n, n} Δθ) describing calculation of the deviation angle d [theta] _n for processing the spectacle lens ML.

The arithmetic control circuit 80 determines the rotation angle _n Δθ from the eyeglass lens shape data (ρ _n , _n Δθ) for lens peripheral processing measured by the lens frame shape measuring device 1 and the radius of curvature R of the grinding wheel. rotation angle of the virtual processing point in the radius vector [rho _n
The deviation angle d [theta] _n and the actual abutment processing point to the grinding wheel of the uncut lens in _n [Delta] [theta] determined in accordance with the flow of FIG. 15. Step 1: The lens frame F of the frame or a template modeled from the frame by the frame shape measuring unit (frame shape measuring device) 1 as the frame shape measuring means, or the eyeglass lens shape of the lens model (ball shape) of the rimless frame. That is, the radial information (ρ _n , _n Δθ) (n = 1, 2,
3,... N), and this information is stored in the processed data storage area 83a of the RAM 83. Step 2: Based on the radius information (ρ _n , _n Δθ) from the frame data memory 102, the radius information (ρ ₀ , ₀ Δθ) having the maximum radius length ρ ₀ is obtained from the information. . Step 3: The axis (lens axis) O of the lens rotation axes 23 and 24 when processing the radius vector based on the maximum radius information (ρ ₀ , ₀ Δθ).
_2, the rotation axis of the grinding wheel 25 (wheel spindle) the center distance between the O ₁ (see FIG. 19). Here, L ₀ is determined as L ₀ = ρ ₀ + R from the known grinding wheel radius R and the moving radius length ρ ₀ .
Further, the processing information (L ₀ , ρ ₀ , ₀ Δθ) is stored in the processing data storage area 83 a of the RAM 83. Step 4: Next when rotated unit rotation angle Δθ lens ML, radius of the maximum radius vector length [rho ₀ is determined axial distance L1 at the processing point F ₀ which is in contact with the grinding wheel 25. Where L1 is

[0110]

(Equation 1)

Is obtained as follows. Step 5: With the maximum radius ρ ₀ positioned at the machining point F ₀ , the radius information (ρ _n , _n Δ) in the frame data memory 102
θ), the radial information from the maximum radial to the I-th predetermined value (ρ ₁ , ₁ Δθ), (ρ ₂ , ₂ Δθ),...
(Ρ _i , _i Δθ), virtual processing point F _{1 of} (ρ _I , _I Δθ)
_{F 2, ... F i, ...} F I look, further, virtual grindstone for processing the respective processing point radius _{R 1, R 2, ... R} i, ... R I
(See FIG. 20). Step 6: The actual radius R of the grinding wheel 25 and the radius R _i (i = 1, 2, 3,.
I). If R ≦ R _i , even if the lens is ground based on the maximum radius (ρ ₀ , ₀ Δθ) at the processing point F ₀ , the virtual radius F _i (i = 1, 2, 3) …
i,... I) and the grinding wheel 25 do not come into contact with each other, so that the deviation angle dθ _i does not occur and it is determined that “interference of the grinding wheel” does not occur, and the processing information (L ₁ , ρ ₁ , ₁ Δ
θ) is input to and stored in the processing data storage area 83a of the RAM 83 in Step 10, and then Step 11
Move to. If R> R _i , the process proceeds to step S7. Step 7: When it is determined in step 6 that R> R _i , as shown in FIG. 21, a deviation angle dθ _i due to “interference of the grindstone” occurs at the virtual machining point Fi. In this case, the center distance L ₁ (F _i ) for processing the virtual (interference) processing point F _i with a grindstone having a radius R is given by

[0112]

(Equation 2)

(See FIG. 22). Step 8: Distance L between axes obtained in step 7
_It was determined in advance in the same manner as in step 5 with reference to the processing point F _i to be processed in ₁ (F _i ). Each virtual machining point is determined for the radial radius up to the I-th, and each virtual grinding wheel R
_i (F _i ). Step 9: Similar to step 6, the distance L ₁ (F _i ) between the axes
And the virtual wheel radius R _{i in} step 8
(F _i ). If R ≦ R _i (F _i ), the process proceeds to step 10. If R> R _i (F _i ), the process returns to step 7 in order to obtain the center distance at the new interference point “ζ”. Step 10: When R ≦ R _i (F _i ) in step 9, processing information (L ₁ (F _i ), ρ ₁ , ₁ Δθ) is stored in the RAM.
The data is input to the processed data storage area 83a of the storage device 83 and stored. Step 11: In the above steps 3 to 10, it is checked whether or not “grinding wheel interference” occurs with respect to the radial information of (ρ ₁ , ₁ Δθ). Processing information (L ₁ , ρ ₁ , ₁ Δ
θ) or (L ₁ (F _i ), ρ ₁ , ₁ Δθ). Subsequently, steps 3 to 10 are executed for the next moving radius (ρ ₂ , ₂ Δθ), and these steps are also executed for the remaining moving radius. Step 12: In this step, the deviation angle dθ _n (n = 0, 1, 2, 3,...) Due to the “interference of the grindstone” as described above.
i,... I) is determined by the radial radius ρ of the rotation angle _n Δθ.
_n [n = 0, 1, 2,..., j = 1000 (= 360 °)], and processing information (L _n , ρ _n , _n Δθ) that does not generate this when it is determined to be generated ) Is determined. If the determination on all the radial information has not been completed, the process returns to step S4 and loops. When the determination on all the radial information is completed, the obtained processing information (L _n , ρ _n , _n Δθ)
Is stored in the processing data storage area 83a of the RAM 83,
The processing shifts to step 13 in FIG. 15 to start the grinding of the lens to be processed (eyeglass lens) ML and the speed control during the processing.

The arithmetic control circuit 80 determines the shift angle dθ _n when obtaining the processing information (L _n , ρ _n , _n Δθ) in this manner.
The seeking, the deviation angle memory 10 the obtained deviation angle dθ _n
9 as RAM as processing information (L _n , dθ _n , ρ _n , _n Δθ)
83 is stored in the processed data storage area 83a.

Here, before describing the grinding of the lens to be processed (eyeglass lens) ML in step 13 and the speed control during the processing, a normal conversion method of the inter-axis distance of the contact angle τ _i will be described. . (2). Inter-axis distance of contact angle τ _i (i) In a normal ρL (radial ρ-axis distance L) conversion method,
23, although obtained by calculating the center distance L _n between the grinding wheel 25 and the spectacle lens ML when the radius vector [rho _n with respect to the angle .theta.i = _n [Delta] [theta] as shown in FIG. 24, there is a deviation angle d [theta] _n contact position between the grinding wheel 25 and the spectacle lens ML is deviated from the angle .theta.i = _n [Delta] [theta] only deviation angle d [theta] _n, the radius vector of the contact position is [rho _j if. In this case, the calculated center distance L _{n at} the angle _n Δθ is ΔL greater than the actual center distance L _n ′.
An error occurs by the amount. Assuming that the moving radius at the contact angle τ _{n at} this time is ρ _n , if there is a deviation angle dθ _{n at the} angle _n Δθ, the actual axial distance L _n ′ at which the spectacle lens ML should be processed by the grinding wheel 25 is L _n ′ = L _n + ΔL. (Ii) Speed Control at Contact Angle τ _n By the way, the arithmetic and control circuit 80 controls the operation of the pulse motor 18 as described below using the deviation angle dθ _n obtained in this way, and The rotation speed of the lens (the unprocessed circular eyeglass lens) ML is controlled.

Calculation of Contact Angle τ _n As described above, when the lens to be processed (glass lens) ML is in contact with the deviation angle dθ _n of the grinding wheel 25 at the angle _n Δθ, the eyeglass lens ML is ground. The contact angle τ _n when actually contacting the grindstone 25 is obtained by τ _n = _n Δθ + dθ _n . The obtained contact angle τ _n is stored in the contact angle memory as processing information (L _n , τ _n , ρ _n , _n Δθ) in the data storage area 83c of the RAM 83 in a polar coordinate format.

[0117] Here, the speed of the rotation angle remains constant (the rotational speed S _r), one time for rotating the T _n, remains the rate constant contact angle (rotational speed Ss), and the time for one rotation Ts When the lens is rotated at a speed that combines the two speeds, the rotation speed at that time becomes a speed St represented by 1 / St = 1 / Sr + 1 / Ss. Since the time is represented by Tt = Tr + Ts, the contact can be stabilized without changing the total time of one rotation by changing the synthesis ratio of the constant rotation angular velocity component and the constant contact angle component. Speed component of the contact angle can be increased.

This ratio needs to be set as a constant rotational angular speed component at a speed that does not exceed the higher limit of the rotational speed at which mechanical rotation is possible. This is because the speed of the contact angle can be partially zero, and the speed component of the contact angle can be set without any condition.

By increasing the speed component ratio of the contact angle, the degree of contact stabilization can be increased. The speed component ratio between the rotation angle and the contact angle can be set according to the difference between lens material conditions and processing step conditions. An example will be described. Rotational angular velocity component: Contact angular velocity component (time ratio) Lens material name Roughing Finishing Mirror finishing Grooving Chamfering Mirror finishing Glass 10: 0 5: 5 5: 5 5: 5 4: 6 4: 6 CR-39 8: 2 4: 6 4: 6 5: 5 3: 7 3: 7 High Index 7: 3 3: 7 2: 8 5: 5 3: 7 2: 8 Holly Carpate 8: 2 3: 7 2 : 8 5: 5 3: 7 2: 8 Acrylic 8: 2 3: 7 2: 8 5: 5 3: 7 2: 8 For example, when finishing CR-39, the speed component ratio is 4: 6. Therefore, if the rotation time for determining the speed is set to a ratio of 4: 6 and the total time of one rotation is 10 s in this case, the rotation angular velocity component is 4 s, and the contact angular velocity component is 6 s, This and the change in each part of nΔθ and τn stored as processing information From determining the velocity for that portion.

For example, if the number of divisions n is 1000, the number of data is 1000, and the amount of change is changed by the time obtained by dividing the time of dividing each change by each angular velocity component by the number of divisions.

[0121] rotation angular velocity _{= (2 Δθ- 1 Δθ) /} (4/1
_{000) = (2 Δθ- 1 Δθ} ) /0.04 contact angular velocity _{= (τ 2 -τ 1) /} (6/1000) = (τ
₂ −τ ₁ ) /0.006 is an example, and other points are obtained in the same manner.

As described above, in the lens grinding method of the present invention, the eyeglass shape information of the eyeglass frame, the eyeglass lens information such as the material of the eyeglass lens, and the various eyeglass processing information necessary for the processing of the eyeglass lens are used. The lens rotation speed at the time of grinding the spectacle lens is changed.

In the embodiment of the present invention, a pulse motor is used, but there is a limit speed that can be output according to the load. Based on the above principle, the speed (rotation time per rotation) and the speed change can be arbitrarily determined. Although it is possible to change it, if it is applied as it is, it may be impossible to control because it does not match the actual speed limit.

The same applies to the case where a servomotor is used. Here, an embodiment using a pulse motor will be described.

An important point in realizing this control is to match the timing of at least two axes (for example, the control axis for rotating the lens rotation axis and the axis for controlling the distance between the grinding wheel axis and the lens axis). When performing the beveling control, it is necessary to simultaneously control three axes including a relative position control axis (Y axis) of a lens rotation axis and a grinding wheel axis. There is a need to control any of these axes without exceeding the limit speed.

Each motor shaft has a limited control speed. In a pulse motor, this is the highest operating frequency. Generally, an object measured without an external load is referred to. Therefore, it is necessary to consider an external load in order to use it on an actual machine.

When a change in speed is given, it is needless to say that the maximum operating frequency must not be exceeded, but in the range exceeding the self-starting frequency, it is further required that the speed change does not exceed the limit acceleration. (3) Grinding of the lens to be processed (eyeglass lens) ML Therefore, when grinding the lens to be processed (eyeglass lens) ML, the lens rotation speed and the axis are determined using the flowcharts shown in FIGS. It is necessary to control each speed such as the direction relative position control speed, the inter-axis distance control speed between the lens rotation axis and the grinding wheel axis, and the like. Hereinafter, the grinding process of the lens to be processed (eyeglass lens) ML and the speed control such as the lens rotation speed, the axial relative position control speed, and the inter-axis distance control speed between the lens rotation axis and the grinding wheel axis will be described. Step 13 (i) Grinding of lens to be processed (eyeglass lens) ML In step 12 described above, when the determination on all the radial information is completed, the obtained processing information (L _n , ρ _n , _n Δθ) is stored in the processing data storage area 83a of the RAM 83, and the flow shifts to this step in FIG.

The arithmetic and control circuit 80 controls the operation of the grinding wheel drive motor 30 by the motor drive 56a,
The rotational drive of the grinding wheel 35 is controlled clockwise in FIG. The grinding wheel 35 includes a rough grinding wheel (flat wheel), a bevel wheel, a finishing wheel, and the like as described above.

On the other hand, based on the processing data stored in the processing data storage area 83a, that is, the processing information (L _n , ρ _n , _n Δθ), the arithmetic control circuit 80 transmits the lens axis driving motor via the pulse motor driver 86. 25 is driven and controlled,
The lens rotation shafts 23 and 24 and the spectacle lens ML are controlled to rotate counterclockwise in FIG.

At this time, the arithmetic control circuit 80 sets the processing information (L _n , ρ _n , _n Δ) stored in the processing data storage area 83a.
θ), the pulse motor driver 86 is firstly operated and controlled at the position of n = 0 to drive and control the pulse motor 59 so that the screw shaft 58 is rotated in the reverse direction and the cradle 60 is rotated.
Is lowered by a predetermined amount. As the cradle 60 descends,
The lens shaft holder 61 is lowered integrally with the cradle 60 by the weight of the carriage 22 and the spring force of the spring 54 of the working pressure adjusting mechanism 45.

With this descent, the unprocessed circular eyeglass lens ML is moved onto the grinding surface 35 a of the grinding wheel 35 by the carriage 22.
After the self-weight and the spring force of the processing pressure adjusting mechanism 45 abut against each other, only the receiving table 60 is lowered. When the pedestal 60 separates downward from the lens axis holder 61 due to this lowering, the light-shielding plate 211 of the pedestal 60 is detached downward from between the light emitting element and the light receiving element (not shown) of the photo sensor 210 of the lens axis holder 61. Thereby, the detection light from the light emitting element (not shown) of the photo sensor 210 is received by the light receiving element, and the photo sensor 210 detects that the pedestal 60 has separated from the lens axis holder 61 downward. Then, a detection signal from the photo sensor 210 is input to the arithmetic and control circuit 80. After receiving the detection signal from the photosensor 210, the arithmetic and control circuit 80 further controls the driving of the pulse motor 59 to slightly lower the cradle 60 by a predetermined amount.

As a result, the processing information (L _n , ρ _n , _n Δ
θ), when n = 0, the grinding wheel 35 is attached to the spectacle lens ML.
Is ground for a predetermined amount. With this grinding, the lens axis holder 6
When 1 descends and comes into contact with the cradle 60, the sensor S detects this and outputs a detection signal, which is input to the arithmetic and control circuit 80.

The arithmetic control circuit 80 outputs the detection signal
When received, the processing information (L_n, Ρ_n,_nΔθ) n = 1
And grind the spectacle lens ML as if n = 0.
The grinding is performed by the grinding wheel 35. And the arithmetic control circuit
The road 80 performs such control n = j (360 °),
Processing information (L_n, Ρ_n,_nΔθ) angle_nRadial radius ρ for each Δθ _n
The edge of the spectacle lens ML so that
Grinding is performed using a rough grinding wheel with no symbol.

In such grinding, the arithmetic and control circuit 80
Operates the grinding fluid supply pump P to discharge the grinding fluid 62A from the first grinding fluid discharge port (first grinding fluid supply means) 63 of the grinding fluid discharge nozzle 61A, and to discharge the grinding fluid discharge nozzle A grinding liquid 64 is discharged from a second grinding liquid discharge port (second grinding liquid supply means) 65 of 61A.

At this time, the grinding fluid 64 is supplied from the normal direction to the grinding surface 35a of the grinding wheel 35. And
The grinding fluid 65 sufficiently flows toward the lens grinding unit 69 along with the rotation of the grinding wheel 35, sufficiently cools the lens grinding unit 69, and flows down together with the grinding dust onto the lower bottom wall 11e2. It flows down from 11f into a waste liquid tank (not shown) and is collected.

On the other hand, the arithmetic control circuit 80 operates the pump P for supplying the grinding fluid to discharge the grinding fluid 71 from the grinding fluid discharge nozzle 60A in a fan shape so as to spread right and left over the center of the arc-shaped bottom wall 11e1. Then, the arc-shaped bottom wall 11e1 is caused to flow downward from the upper end in the center in the left-right direction so as to spread left and right. Thereby, the grinding waste 70 and the grinding fluid 62A are
Even if a part of the water is scattered to the lower side of the arc-shaped bottom wall 11e1, it is washed down by the flowing grinding fluid 71, and the drain pipe 1
It flows down from 1f into a waste liquid tank (not shown) and is collected.

In such a grinding process, when the speed control is corrected as described below, the distance between the lens axes of the lens rotating shafts 23 and 24 and the grinding wheel axis of the grinding wheel 35 is set to a pulse as described above. The rotation speed of the lens rotating shafts 23 and 24 can be controlled by the operation control of the lens shaft driving motor 25 which is a pulse motor. The control speed in the axial direction of the grindstone shaft of the grindstone can be controlled by controlling the operation of the base drive motor 14. This control is performed by the arithmetic control circuit 80. (ii) Start of speed control accompanying grinding of lens to be processed (eyeglass lens) ML With the start of such grinding of eyeglass lens ML, in this step, the lens rotation speed, the axial relative position control speed,
Speed control such as a control speed between the axes of the lens rotation axis and the grinding wheel axis is started. That is, _assuming that the axes to be controlled (hereinafter, abbreviated as control axes) such as the lens rotation axes 23 and 24, the grinding wheel axis of the grinding wheel 35, and the screw shaft 58, the processing data storage area 83a stores the processing information (L _n , ρ _n). , _N Δθ) n = 0,
Between each point of 1, 2, 3,... J (between n and n + 1)
Limit acceleration A _base (A ^R _base of the data (data determined by the rotational speed and the speed ratio) for the control speed to the control shaft has a table, the arithmetic control circuit 80 with the control shaft in, A ^X _base , A ^Y _base ), a correction is made to the control speed of the control axis between the points during the grinding of the spectacle lens ML in the following procedure. (A) Correction of the Rotation Speed of the Lens Rotation Shaft When the eyeglass lens ML is ground by the grinding wheel 35, the lens rotation speed S _n ^R between a certain point and the lens rotation speed S _{n + 1} ^R between the next points. Then, between points n
When transitioning from point to point n + 1, (S _{n + 1} ^R −
Since the acceleration of ^{_{S n R) / (1 /}} S n + 1 R), the acceleration is determined whether greater than the limit acceleration A ^R _base. That is, if ^{_{(S n + 1 R -S n}} R) / (1 / S n + 1 R) ≦ A R base, without modifying the rotational speed, perform the grinding of the spectacle lens as it is rotational speed And n is raised (S
^{_{n + 1 R -S n R)}} / (1 / S n + 1 R) is equal to or greater than A ^R _base. Further, the routine proceeds to step 14 if ^{_{(S n + 1 R -S n}} R) / (1 / S n + 1 R)> A R base. Step 14 In this step, since the determined acceleration is greater than the limit acceleration, higher speed ^{_{(S n + 1 R),}} new S n + 1 R = A R base * Formula (1 / S _n ^R) The rotation speed of the lens rotation axis is corrected by changing the rotation speed to the speed determined in step (1), and the process proceeds to step S15. Step 15 By the way, after executing for a certain axis (the point-to-point speed changes drastically), in order to make the changed speed correspond to the control speed of the other control axes, the point-to-point speed corresponding to the changed speed (other Control axis), (new S _{n + 1} ^R / S _{n + 1} ^R )
The speed is corrected by multiplying by the ratio.

Therefore, in this step, a new S_{n + 1} ^X,
S_{n + 1} ^YAnd new S_{n + 1} ^X= S_{n + 1} ^X* (New S_{n + 1} ^R/ S_{n + 1} ^R) New S_{n + 1} ^Y= S_{n + 1} ^Y* (New S_{n + 1} ^R/ S_{n + 1} ^RThen, the process proceeds to step S16. Step 16 In this step, whether or not n = j (= 1,000) is satisfied
Is determined, and if not n = j, the process returns to step 13 and
If n = j, the process proceeds to step 17 in FIG.
You. (B) Correction of the control speed of the distance between the axis of rotation of the lens and the axis of the grinding wheel
Correct Step 17 Next, a point is determined for one of the corrected control speeds.
Control speed S between the axes of the lens rotation axis and the grinding wheel axis during the distance n_n ^X
And the inter-axis distance control speed between the next points is S _{n + 1} ^XToss
Then, when shifting from n between points to n + 1 between points
Is (S_{n + 1} ^X-S_n ^X) / (1 / S_{n + 1} ^X) Acceleration
Therefore, this acceleration is the limit acceleration A^X _{bas e}Greater than
Is determined.

[0139] That is, in this judgment, if ^{_{(S n + 1 X -S n}} X) / (1 / S n + 1 X) ≦ A X base, center distance control between the lens rotating shaft and the grinding wheel shaft The eyeglass lens is ground at the same rotational speed without correcting the speed.

Further, (S _{n + 1} ^X −S _n ^X ) / (1 /
If (S _{n + 1} ^X )> A ^X _base , the process proceeds to step 18. In Step 18 This step, since the determined acceleration is greater than the limit acceleration, higher speed (S _{n + 1} ^X), the ^{_{new S n + 1 X = A}} X base * (1 / S n X) formula The speed is changed to the determined speed, the inter-axis distance control speed between the lens rotation axis and the grinding wheel axis is corrected, and the process proceeds to step S19. Step 19 By the way, after executing for a certain axis (the point-to-point speed changes drastically), in order to make the changed speed correspond to the control speed of the other control axes, the point-to-point speed corresponding to the changed speed (other Control axis), (new S _{n + 1} ^X / S _{n + 1} ^X )
The speed is corrected by multiplying by the ratio.

Therefore, the new S_{n + 1} ^Y, S_{n + 1} ^RTo new S_{n + 1} ^Y= S_{n + 1} ^Y* (New S_{n + 1} ^X/ S_{n + 1} ^X) New S_{n + 1} ^R= S_{n + 1} ^R* (New S_{n + 1} ^X/ S_{n + 1} ^X) Determined based on the equation, and proceed to step 20. Step 20 In this step, whether n = j (= 1,000)
Is determined, and if not n = j, the process returns to step 17
If n = j, the process proceeds to step 21 in FIG.
You. (C) Axial relative position control between the lens rotation axis and the grinding wheel axis
Speed correction Step 21 In addition, a certain point is not corrected by the limit acceleration.
Relative position control speed between lens rotation axis and grinding wheel axis between n points
Degree S_n ^YAnd the relative position control speed between the next points is S
_{n + 1} ^YMoves from n between points to n + 1 between points
When you do (S _{n + 1} ^Y-S_n ^Y) / (1 / S_{n + 1} ^Y) Acceleration
This acceleration is the limit acceleration A^Y _baseThan
Determine if it is large.

[0142] That is, the ^{_{(S n + 1 Y -S n}} Y) / (1 / S n + 1 Y) if ≦ A ^Y _base, the relative axial position control speed between the lens rotating shaft and the grinding wheel shaft The eyeglass lens is ground at the same rotation speed without correction.

Further, (S _{n + 1} ^Y− S _n ^Y ) / (1 /
If (S _{n + 1} ^Y )> A ^Y _base , the process proceeds to step _S22 . In Step 22 This step, since the determined acceleration is greater than the limit acceleration, higher speed (S _{n + 1} ^Y), the ^{_{new S n + 1 Y = A}} Y base * (1 / S n Y) Formula The speed is changed to the obtained speed, and the relative position control speed between the lens rotation axis and the grinding wheel axis is corrected. Step 23 By the way, after the execution for a certain axis (the speed between points is greatly changed), in order to make the changed speed correspond to the control speed of the other control axes, the speed between points corresponding to the changed speed (other Control axis), (new S _{n + 1} ^Y / S _{n + 1} ^Y )
The speed is corrected by multiplying by the ratio.

[0144] Thus, the new S _{n + 1} ^R, new the ^{_{S n + 1 X S n +}} 1 R = S n + 1 R * (new S n + 1 Y / S n + 1 Y) new S n + 1 ^X = _{Sn +} ^1X * (newSn ₊ ^1Y / _{Sn +} ^1Y ) Expression is obtained, and the process proceeds to step 24. After step 24, the series of corrections so as not to exceed the limit acceleration up to this point are repeatedly performed, and it is confirmed that the acceleration does not exceed the limit acceleration (there is no need to make corrections), and the process is terminated.

That is, in this step, n = j (= 1, 0
00), and if n = j, the flow returns to step 21 to loop, and if n = j, the flow ends.
Note that the number j for dividing 360 ° per rotation is not limited to 1000 points.

The method described here is based on the premise that there is a control in which all control axes exceed the acceleration limit. However, if there is an axis that clearly does not reach the acceleration limit among the control axes, , It is possible to omit the correction work for the axis. The operation of correcting by multiplying the speed ratio generated by the correction cannot be naturally omitted for all axes. The acceleration limit is mainly determined by the characteristics of the motor. Since the motor itself rotates with inertia, there is a limit speed in the high speed range. The self-starting frequency is a speed that can be reached by starting from speed 0 without an external load.

As described above, according to the lens grinding method of the present invention, the rotational speed of the lens rotating shaft for rotating the spectacle lens, the control speed of the axial relative position between the lens rotating shaft and the grinding wheel shaft, the lens shaft and the grinding wheel Determining at least one of the axis-to-axis distance control speed with the shaft, and checking whether the determined speed does not exceed the mechanical limit speed;
Modifying at least one of those speeds if exceeded.

The lens grinding apparatus of the present invention controls a lens rotation axis for rotating a spectacle lens, a grindstone axis for grinding a spectacle lens, and an axial relative position between the lens rotation axis and the grindstone axis. Axial direction control means for performing, and a lens grinding processing apparatus having an inter-axis control means for controlling the inter-axis distance between the lens rotation axis and the grinding wheel axis, the rotation speed of the lens rotation axis, the lens rotation axis, Determine at least one of the control speed of the relative position in the axial direction with the grinding wheel axis and the control speed of the distance between the lens axis and the grinding wheel axis, and check whether the calculated speed does not exceed the mechanical limit speed. And it is configured to have arithmetic control means for correcting at least one of the speeds when the speed is exceeded.

[0149]

As described above, according to the present invention, the rotation speed of the lens rotating shaft, the control speed of the distance between the lens rotating shaft and the grinding wheel shaft, or the relative position control speed of the lens rotating shaft and the grinding wheel shaft is controlled by the mechanical speed. Check if the target speed limit is not exceeded, and if so, the rotation speed of the lens rotation axis or the control distance between the lens rotation axis and the grinding wheel axis, or the relative position between the lens rotation axis and the grinding wheel axis By modifying the control speed, the eyeglass lens can be ground at a rotational speed that takes into account the actual mechanical limit speed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a relationship between a lens grinding device provided with a layout display device according to an embodiment of the present invention and a frame shape measuring device.

FIGS. 2A and 2B show a lens grinding apparatus according to an embodiment of the present invention, wherein FIG. 2A is a perspective view in a cover closed state, and FIG. 2B is a perspective view in a cover open state.

3A and 3B show a lens grinding apparatus according to an embodiment of the present invention, wherein FIG. 3A is a plan view with a cover closed, and FIG. 3B is a plan view with a cover open.

FIG. 4 shows a lens grinding apparatus according to an embodiment of the present invention, wherein (A) is an enlarged explanatory view of a first operation panel,
(B) is a front view of the liquid crystal display.

5A is a perspective view of a grinding chamber of the lens grinding apparatus shown in FIG. 1, and FIG. 5B is a cross-sectional view taken along line BB of FIG.

FIG. 6 is a schematic cross-sectional view taken along the line AA of FIG.

FIG. 7 is a perspective view of the grinding chamber of FIG. 5 (b) viewed from another angle.

FIG. 8 is a perspective view illustrating a mounting portion of the carriage of FIG. 7;

9 is a front view of the machining pressure adjusting mechanism and the inter-axis distance adjusting mechanism for controlling the vertical movement of the lens rotating shaft in FIG. 7;

FIG. 10 is an explanatory view of the working pressure adjusting mechanism of FIG. 7;

11 is a sectional view showing a driving mechanism of the chamfering grindstone, the grooving grindstone, and the like in FIG. 7;

FIG. 12 is an enlarged perspective view of the inter-axis distance adjusting mechanism shown in FIGS. 7 and 9;

FIG. 13 is a control circuit diagram of the lens grinding apparatus of FIGS. 1 to 12.

FIG. 14 is a time chart for explaining control of the control circuit of FIG. 13;

FIG. 15 is a flowchart for obtaining machining data and a shift angle by the control circuit of FIG. 13;

FIG. 16 is a flowchart for correcting the rotation speed of a lens rotating shaft during grinding of a lens to be processed by the control circuit of FIG. 13;

17 is a flowchart for correcting a control speed of an inter-axis distance between a lens rotation axis and a grinding wheel axis during grinding of a lens to be processed by the control circuit of FIG. 13;

18 is a flowchart for correcting the relative position control speed in the axial direction between the lens rotation axis and the grinding wheel axis during the grinding of the lens to be processed by the control circuit of FIG. 13;

FIG. 19 is an explanatory diagram showing the relationship between the moving radius of the spectacle lens and the diameter of the grinding wheel for explanation according to the flowchart of FIG. 15;

FIG. 20 is an explanatory diagram showing a relationship between a moving radius of an eyeglass lens and a diameter of a grinding wheel for explanation according to the flowchart of FIG. 15;

FIG. 21 is an explanatory diagram illustrating a relationship between a moving radius of an eyeglass lens and a diameter of a grinding wheel for explanation according to the flowchart of FIG. 15;

FIG. 22 is an explanatory diagram showing the relationship between the moving radius of the spectacle lens and the diameter of the grinding wheel for explanation according to the flowchart of FIG. 15;

FIG. 23 is a diagram illustrating the operation of the present invention.

FIG. 24 is an enlarged explanatory view of a main part of FIG. 23;

[Explanation of symbols]

14 ... Base drive motor (axial direction adjusting means) 23, 24 ... lens rotating shaft 35 ... grinding wheel 43 ... inter-axis distance adjusting means (inter-axis distance controlling means) 80 ... arithmetic control Circuit O ₂ ··· Lens axis O ₁ ··· Rotation axis (grinding stone axis) ML ··· Eyeglass lens

[Procedure amendment]

[Submission date] June 6, 2001 (2001.6.6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010]

Embodiments of the present invention will be described below. [Summary of the Invention] The present invention basically has the contents described in the following (1.1) to (1.5). [Summary] The present invention basically has the contents described in the following (1.1) to (1.5). (1.1) When there is a finite number of pieces of radial information of the frame shape, the radial diameter of the lens is directed toward the center of the grinding wheel. In order to represent this direction, the direction with respect to the rotation reference position when the lens shape is expressed in the polar coordinate system is called a rotation angle, and the direction with respect to the rotation reference position when the lens shape in contact with the grindstone is expressed in the polar coordinate system at that time. The angle between the two is called the contact angle, and the angle between the two is called the machining angle. Here, considering the state where the vertices are in contact and the state where the sides are in contact, in the state where the vertices are in contact, while the rotation angle changes greatly,
The contact angle does not change, and as a result, the machining angle changes with a change in the rotation angle. On the other hand, when the sides are in contact, the change in the contact angle is greater than the change in the processing angle, and the contact angle overtakes the processing angle across the midpoint of the side. Become. Similarly, the machining angle is 0 at the midpoint of the side, but before and after the machining angle is in the opposite direction. The rotation angle represents the rotation of the lens during processing even when considering the entire spatial coordinate system including the grindstone, but the part where the contact angle does not change while the rotation angle changes by the unit angle Conversely, a portion where the contact angle greatly changes occurs. Even if the rotation angle changes, the fact that the contact angle does not change means that even if the lens is rotated, there is no change in the position in contact with the grindstone, and as a result, the same position is machined for a long time It will be. In such a part, it is necessary to speed up the rotation to avoid waste. Conversely, in a part where the contact angle greatly changes with respect to the rotation angle, the amount of rotation increases, and Is moved, and as a result, sufficient processing by the grindstone does not proceed. Until now, the control data (X direction) has been obtained using the so-called ρL conversion, but in the ρL conversion, the L data (X direction) is determined based on the rotation angle. This L
In the process of obtaining the data, the processing angle and the ρ data at that time were used for calculating the L data. Since the contact angle is located at a position separated from the rotation angle by the processing angle, a change in the contact angle can be seen by looking at this change . As a method for realizing the concept of this, the rotation angle, consider the changes in each part of the contact angle, consider the ratio between the respective change. That is, the contact angle ratio = (change in contact angle) / (change in rotation angle). If the rotation speed is proportional to the reciprocal of this ratio, contact will be constant regardless of which part is captured. Since there is a portion where the change in the contact angle is almost 0 to a very large portion, the change in the contact angle ratio is large. This reciprocal is almost 0
To infinity, so it cannot be completely proportional. (1.5) In order to overcome this, the rotation speed of each part is determined by combining a part for stabilizing contact and a part for simple rotation. Rotation speed = contact stable part + simple rotation part By changing this composition ratio according to various processing conditions (materials, processing steps), the lens rotation speed is more positively changed. (1.6) In the embodiment of the present invention, the pulse motor is used, but there is a limit speed that can be output according to the load, and the speed (rotation time per rotation) and the speed change can be arbitrarily determined based on the above principle. Although the degree can be changed, if it is applied as it is, it will not be in control because it does not match the actual speed limit.

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 3C049 AA02 AA11 AA13 AA16 AB01 AB06 BA01 BA02 BA06 BB09 BC01 BC02 CA01 CB01 CB03

Claims (2)

[Claims] At least one of a rotation speed of a lens rotating shaft for rotating a spectacle lens, a control speed of an axial relative position between the lens rotating shaft and the grinding wheel shaft, and a control speed of an inter-axis distance between the lens axis and the grinding wheel shaft. Determining that one of the speeds does not exceed a mechanical limit speed, and correcting at least one of those speeds if the speed is exceeded. Characteristic lens grinding method. 2. A lens rotation axis for rotating a spectacle lens,
A grindstone axis for grinding an eyeglass lens, axial direction control means for controlling an axial relative position between the lens rotation axis and the grindstone axis, and an interaxial distance between the lens rotation axis and the grindstone axis A rotation speed of a lens rotation axis, a control speed of an axial relative position between the lens rotation axis and the grinding wheel axis, and a distance control between the lens axis and the grinding wheel axis. Calculation control means for determining at least one of the speeds, checking whether the determined speed does not exceed the mechanical limit speed, and correcting at least one of those speeds when the speed is exceeded. A lens grinding apparatus comprising: