JP2007253279A - Lens grinding device provided with chamfering mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens grinding device provided with a low-cost chamfering mechanism, capable of efficiently conducting chamfering work subsequently to grinding work using a grinding disc. <P>SOLUTION: In the lens grinding 1 device provided with the chamfering mechanism, the grinding disc 4 for grinding a lens, having a grinding surface 4a that is spherical, is rotated around a rotation center line 4A passing a spherical center O of the spherical surface, and the spherical center is oscillated in such a way that the rotation center line 4A draws a conical surface around the spherical center O for spherically grinding a lens material W. After spherically grinding work, the ground lens material W1 is retracted upward, a chamfering tool 61 of the chamfering mechanism 60 is positioned in a chamfering position 61A that coincides with the rotation center line 4A. The ground lens material W1 is pressed to the chamfering tool 61 to rotate, so that it is chamfered. After chamfering work, the chamfering tool 61 is returned to a retraction position 61B where it does not interfere with the grinding disc 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lens grinding apparatus that grinds an optical spherical lens by using a grinding pan having a spherical grinding surface. More specifically, the present invention relates to a lens grinding apparatus having a chamfering mechanism for chamfering a ground lens material and a method for using the same.

  As a method for grinding an optical spherical lens, a spherical surface creation method using a cup-type grindstone is widely known. In this method, as shown in FIG. 6, the spherical grinding surface 104 of the cup-type grindstone 103 rotating around the axis 102 is pressed against the glass material 101 to be processed rotating around the axis 100. Grinding is performed to create a spherical surface 105 whose center is the intersection of the axes 100 and 102. This processing method is a complete spherical surface generation method, but there are problems such as a curvature error due to wear of the cup-type grindstone 103 and a remaining shaving at the center of the ground surface of the glass material 101.

  The present applicant has proposed a lens grinding method in Patent Document 1 in which a spherical tool is ground by rotating a diamond tool which is a dish-shaped grindstone and swinging a spherical center. If the lens grinding method disclosed here is employed, the problems that occur in the spherical surface creation method using a cup-type grindstone can be solved. In particular, there is also an advantage that variation in curvature on the obtained lens surface can be relatively reduced in grinding of a lens surface having a large curvature.

On the other hand, as an optical spherical lens chamfering device, Patent Document 2 proposes a lens outer peripheral chamfering device attached to a curve generator using a cup-type grindstone and capable of chamfering simultaneously with spherical processing of the lens. ing. Further, Patent Document 3 proposes a method of chamfering by pressing against a concave lens to be chamfered while rotating a convex chamfering grindstone having a radius of curvature larger than that of the concave lens to be chamfered. .
JP 2003-340702 A Japanese Utility Model Publication No. 49-28293 JP 2002-126986 A

  Here, in grinding using a cup-type grindstone, as described in Patent Document 2, there is an advantage that a chamfering device that performs simultaneous machining can be attached to the curve generator. However, the lens grinding process using the dish type grindstone proposed in Patent Document 1 is superior to the spherical surface creation method using the cup type grindstone as described above, but a chamfering device for simultaneous chamfering is provided. There is a disadvantage that it can not.

  For this reason, in lens grinding using a dish-type grindstone, a chamfering operation is performed manually, or an independent chamfering device equipped with a grindstone rotating shaft is arranged, for example, a method shown in Patent Document 3 It was necessary to chamfer.

  In view of this point, it is an object of the present invention to perform chamfering following grinding using a dish-type grindstone without using an independent chamfering apparatus and without increasing the rotation axis. The object is to propose a lens grinding apparatus with a chamfering mechanism.

In order to solve the above problems, the lens grinding apparatus with a chamfering mechanism of the present invention is:
A grinding pan with a spherical grinding surface;
A grinding pan spindle which supports the grinding pan and is arranged in a state where the central axis passes through the spherical center of the grinding surface;
A ball swinging body supporting the grinding plate spindle;
A rocking mechanism for rocking the spherical rocking body so that the central axis of the grinding pan spindle rotates on a conical surface having the spherical center as a vertex;
A grinding pan rotating mechanism for rotating the grinding pan spindle about a central axis;
A lens holder that holds the lens material to be processed and is arranged so that the center axis passes through the spherical center;
A workpiece feeding mechanism for feeding the lens holder along the central axis toward the grinding pan;
A workpiece rotation mechanism for rotating the lens holder around its central axis;
A chamfering mechanism for chamfering a ground lens material obtained by grinding the lens material with the grinding plate,
The chamfering mechanism is
A chamfering tool with an annular tapered grinding surface;
A tool moving mechanism for moving the chamfering tool to a chamfering position whose center axis coincides with the center axis of the lens holder, and a retreating position retracted from the chamfering position;
A chamfering feed mechanism for moving the chamfering tool relative to the lens holder in the direction of the center axis thereof,
When the lens holder holding the ground lens material is returned in a direction away from the grinding plate, the chamfering tool can be disposed between the ground lens material and the grinding plate. It is said.

  In the lens grinding apparatus with a chamfering mechanism having this configuration, the spherical lens is ground and chamfered as follows.

  First, the grinding pan is rotated and the ball is pivoted, and the lens material held by the lens holder is fed out at a predetermined feed speed to the grinding surface of the grinding pan that is rotating and pivoting. The lens material is pressed while being fed to the grinding plate at a predetermined cutting feed speed.

  Next, the ground lens material obtained by performing a predetermined grinding process is returned in a direction away from the grinding pan.

  Thereafter, the chamfering tool is moved from the retracted position to be positioned at the chamfering position, the ground lens material held by the lens holder is fed out, and the tapered grinding of the chamfering tool at the chamfering position is performed. The ground lens material is pressed against the surface and fed to the chamfering tool at a predetermined cutting feed speed, and the ground lens material is ground for chamfering.

  Then, the chamfered lens material after the chamfering process is separated from the chamfering tool, and the chamfering tool is retracted from the chamfering position to the retracted position.

  In the present invention, the lens material is ground while the ball is rocked so that the center of rotation of the grinding pan provided with the spherical grinding surface draws a conical surface whose vertex is the spherical center of the spherical grinding surface. By swinging the tool plate in this way, a spherical lens surface with a small curvature can be processed with high accuracy. Further, chamfering can be continuously performed without removing the ground lens material whose spherical surface has been ground from the lens holder. In the chamfering process, it is only necessary to rotate the lens holder holding the ground lens material, so that it is not necessary to newly provide a rotation axis for the chamfering process. Therefore, it is possible to realize a lens grinding apparatus that can perform chamfering efficiently and at a low cost.

  Here, in the present invention, the tool movement mechanism is characterized in that the chamfering tool is moved along a linear or curved movement path.

  Further, the feed mechanism for chamfering is a chamfering tool feed mechanism for reciprocating the workpiece feed mechanism and / or the chamfering tool in the direction of the feed axis.

  Furthermore, in the present invention, a numerical control unit that numerically controls the feeding operation of the lens holder by the workpiece feeding mechanism, and the numerical control unit instructs the numerical value with respect to the position of the chamfering tool, and the lens holder The size of the surface of the ground lens material is controlled by pressing and moving the ground lens material held on the chamfering tool against the chamfering tool.

  In the lens grinding apparatus with a chamfering mechanism of the present invention, the grinding pan provided with the spherical grinding surface is pivoted so that the rotation center line draws a conical surface having the spherical center of the spherical grinding surface as a vertex. However, the lens material is ground. By swinging the tool plate in this way, a spherical lens surface with a small curvature can be processed with high accuracy. Further, chamfering can be continuously performed without removing the ground lens material whose spherical surface has been ground from the lens holder. In the chamfering process, it is only necessary to rotate the lens holder holding the ground lens material, so that it is not necessary to newly provide a rotation axis for the chamfering process. Therefore, it is possible to realize a lens grinding apparatus that can perform chamfering efficiently and at a low cost.

  Embodiments of a lens grinding apparatus with a chamfering mechanism to which the present invention is applied will be described below with reference to the drawings.

  FIG. 1 is a schematic configuration diagram showing a main part of a lens grinding apparatus with a chamfering mechanism for grinding an optical spherical lens according to the present embodiment. A lens grinding apparatus 1 with a chamfering mechanism includes a lens holder 3 for holding a lens material W to be processed, and a grinding plate provided with a spherical grinding surface 4a for grinding the lens material W held by the lens holder 3. 4. Further, a chamfering mechanism 60 including a chamfering tool 61 is attached.

  The lens holder 3 is fixed to the lower end of the vertical work spindle 5 with the holding surface 3a held horizontally so that the holding surface 3a faces downward. A suction passage 5 a extending in the axial direction is formed at the center of the work spindle 5, its lower end opens to the center of the holding surface 3 a of the lens holder 3, and its upper end passes through the rotary joint 6 and the air filter 7. Via the suction side of the vacuum generator 8. By vacuum-suctioning the suction passage 5 a by the vacuum generator 8, the lens material W is sucked and held on the holding surface 3 a of the lens holder 3.

  The work spindle 5 is coaxially arranged inside a cylindrical vertical holding cylinder 9 whose upper end is sealed, and is supported by the vertical holding cylinder 9 in a rotatable state via a pair of upper and lower bearings 10 and 11. ing. The work spindle 5 is rotationally driven by a lens shaft rotating motor 12 around a lens rotation center line 5A which is a vertical center axis thereof. An air cylinder 13 is connected to the upper end of the vertical holding cylinder 9, and the air cylinder 13 is fixed inside a support cylinder 14 whose upper end is sealed. The vertical holding cylinder 9 is pressed downward by a predetermined force by the air cylinder 13.

  The work spindle 5 is moved up and down by a work feeding mechanism 20. The workpiece feeding mechanism 20 includes a horizontal arm 21, and a vertical holding cylinder 9 is inserted coaxially into a vertical cylindrical portion 22 attached to the tip of the horizontal arm 21, and the support cylinder 14 is fixed to the upper surface of the horizontal arm 21. Has been. The horizontal arm 21 is moved up and down along the vertical linear guide 26 by a lifting mechanism including a feed screw 23, a nut 24, and a servo motor 25.

  Here, a proximity sensor 27 for detecting the upper end 9a of the vertical holding cylinder 9 attached to the inside of the support cylinder 14 supporting the lens spindle shaft 5 via the air cylinder 13 is attached. Yes. Normally, the proximity sensor 27 is in an off state, and when the vertical holding cylinder 9 rises relative to the support cylinder 14, the upper end 9a is detected by the proximity sensor 27, and the sensor output is turned on.

  Next, in the grinding pan 4 disposed below the lens holder 3, the spherical center O of the spherical grinding surface 4a is on an extension of the lens rotation center line 5A (center axis of the work spindle 5) on the lens holder 3 side. It is arranged to be located. A spindle 4b is integrally formed on the back surface of the grinding pan 4, and the spindle 4b is supported by a spherical rocking body 31 in a rotatable state. Here, the spindle 4b is pivoted so that the rotation center line 4A of the grinding pan 4 (center axis of the spindle 4b) intersects the lens rotation center line 5A extending vertically at an acute angle θ at the ball center O. It is supported by the moving body 31.

  The spherical rocking body 31 includes a hemispherical cup portion 31a and a cylindrical portion 31b projecting radially outward from the outer peripheral surface portion at the center of the bottom of the cup portion 31a, and is coaxial with the cylindrical portion 31b. The spindle 4b is attached in a rotatable state. A flange 31c extends laterally from the lower end of the cylindrical portion 31b, and a spindle driving motor 32 is mounted on the flange 31c.

  The cup portion 31 a of the ball center rocking body 31 is supported by a ring-shaped inner peripheral surface 33 a formed on the support plate 33 in a state in which the ball core can rock. The annular inner peripheral surface 33a is a spherical surface having the spherical center O as a spherical center, and the cup portion 31a having a spherical outer peripheral surface 31d placed on the annular inner peripheral surface 33a can swing around the spherical center O. It is. In this example, a compressed air blowing hole or groove 33b is formed in the annular inner peripheral surface 33a, and the compressed air is supplied to the annular inner peripheral surface 33a through a compressed air supply path 33c. Accordingly, the cup portion 31a is held in a state of being lifted from the annular inner peripheral surface 33a. Therefore, the ball swinging body 31 can be swung smoothly around the ball center O.

  The lower end of the ball swinging body 31 is connected to the output shaft of the electric motor 36 via a link joint 34 and a swinging width adjusting unit 35. The connection point 34a between the ball center rocking body 31 and the link joint 34 is located on the extended line of the grinding pan rotation center line 4A, and the rotation center line 36A of the electric motor 36 is always kept facing the ball center O. When the adjustment knob 35a of the swinging width adjustment unit 35 is operated, the distance between the connection point 34a and the rotation center line 36A of the electric motor 36 changes. Therefore, the swing width of the swing motion of the ball center swing body 31 can be adjusted.

  Next, the electric motor 36 is supported by a swing angle adjusting unit 37. The swing angle adjusting unit 37 includes an arcuate cam 38 disposed at a fixed position, and the cam 38 has an arc shape with the sphere center O as the center. A support member 39 is attached so as to be slidable along the cam 38, and an electric motor 36 is attached thereto. A nut 40 is fixed to the support member 39, and a feed screw 41 is screwed into the nut 40. The end of the feed screw 41 is connected to the handle 42.

  When the handle 42 is turned, the support member 39 moves along the cam 38. That is, the grinding pan spindle 4b supported by the ball center rocking body 31 rocks by a predetermined amount around the ball center O. Therefore, the swing angle adjusting unit 37 can change the angle θ formed by the rotation center line 4A of the grinding pan 4 with respect to the vertical lens rotation center line 5A, that is, the angle of the swing center line.

  Next, FIG. 2 is a partial perspective view showing a portion of the chamfering mechanism 60 of the lens grinding apparatus 1 with a chamfering mechanism. Referring to FIGS. 1 and 2, the chamfering tool 61 of the chamfering mechanism 60 of the present example is a diamond tool having a tapered annular grinding surface 61a spreading upward, and the central axis 61b thereof is It is fixed to the tip of the tool arm 62 so as to be parallel to the lens rotation center line 5A. The rear end portion of the tool arm 62 is fixed to a vertical rotation shaft 63, and this vertical rotation shaft 63 is supported by a support block 65 through a bearing 64 in a rotatable state. The vertical rotation shaft 63 is rotationally driven by a rotary actuator 66 attached to the upper end surface of the support block 65.

  When the vertical rotation shaft 63 is rotated by the rotary actuator 66, the tool arm 62 extending horizontally therefrom pivots in the horizontal direction, and the chamfering tool 61 attached to the tip of the tool arm 62 is centered on the lens rotation center line 61b. The chamfering position 61A coincides with 5A and can be moved to the retreat position 61B that retreats laterally from the chamfering position 61A. In a state where the chamfering tool 61 is in the retracted position 61B, the chamfering tool 61 does not interfere with the lens holder 3 fed downward and the lens material W held there.

  The support block 65 is supported by an elevating slider 67. The elevating slider 67 can be moved up and down along a vertical rail 68 fixed to a device mount (not shown), and is moved up and down by an air cylinder 69. It has become. When the air cylinder 69 is driven to raise and lower the elevating slider 67, the support block 65 attached thereto moves up and down. Therefore, the tool arm 62 extending horizontally from the vertical rotation shaft 63 supported by the support block 65 is also raised and lowered, and the chamfering tool 61 attached to the tip of the tool arm 62 is raised and lowered.

  Next, in this example, the drive control of each of the above parts is performed by the controller 50 for numerical control. An input device 51 is connected to the controller 50, and the feed amount and cutting amount of the lens material W held in the lens holder 3 and the ground lens material W 1 obtained by spherical grinding are designated by inputting numerical values. The feed amount and the chamfer amount during chamfering can be determined. In addition, an operation of feeding out the lens material W and the like can be performed manually through the input device 51.

(Spherical grinding)
With reference to FIG. 3, the spherical grinding operation | movement of the lens grinding apparatus 1 with a chamfering mechanism of this example is demonstrated. First, the lens material W is attracted and held on the lens holder 3. Next, the servo motor 25 is driven by a manual operation to jog the lens material W toward the grinding plate 4. When the lens material W comes into contact with the grinding pan 4, the work spindle 5 stops descending. Thereafter, only the horizontal arm 21 (work feed table) is lowered by jog feed. As a result, the work spindle 5 and the vertical holding cylinder 9 that rotatably supports the work spindle 5 are raised relative to the horizontal arm 21, and the proximity sensor 27 detects the upper end 9a of the vertical holding cylinder 9. Switch on.

  After confirming that the proximity sensor 27 is switched on, the jog feed is temporarily stopped. Thereafter, the feed speed of the servo motor 25 is set to an extremely low speed, and the horizontal arm 21 is raised. When the horizontal arm 21 rises, the stopped work spindle 5 and the vertical holding cylinder 9 are lowered relative to the proximity sensor 27. As a result, the upper end 9a of the vertical holding cylinder is disengaged from the detection position of the proximity sensor 27, and the proximity sensor 27 is turned off again. The controller 50 stores the position at the moment of switching off as the machining start position.

  The controller 50 adds the machining allowance from the machining start position and sets the machining completion position. Also, the speed change point is set by adding the amount of the first cutting amount to the machining start position. When a machining start command is input after setting each point in this manner, the rotation of the lens material W that is sucked and fixed to the grinding pan 4 and the lens holder 3 is started. Thereafter, the lens material W is sent out to the processing start position by fast-forwarding.

  After reaching the machining start position, the speed is switched to the first cutting speed, and grinding is performed while feeding the lens material W at this speed. FIG. 3 (a) shows a state at the start of grinding.

  After the lens material W is cut by the first cutting amount and reaches the first cutting position, that is, after reaching the cutting state as shown in FIG. Then, cutting is performed while feeding the lens material W at a finishing speed slower than the first cutting speed. As a result, the lens material W is ground to obtain a ground lens material W1 having a spherical lens surface Wa as shown in FIG.

  When it is confirmed that the machining completion position has been reached, after the swinging by the ball swinging body 31 is stopped, the horizontal arm 21 is returned upward, and the rotation of the grinding plate 4 is stopped.

(Chamfering)
Here, the horizontal arm 21 is returned upward, and the chamfering tool 61 can be inserted from the side between the ground lens material W1 held by the lens holder 3 at the lower end thereof and the grinding plate 4 below the ground arm. Secure the interval. Further, the rotation of the work spindle 5 is maintained from 2000 rpm to 3000 rpm. That is, the state where the ground lens material W1 is rotated from 2000 rpm to 3000 rpm is maintained.

  Thereafter, the rotary actuator 66 of the chamfering mechanism 60 is driven to turn the tool arm 62 to move the chamfering tool 61 attached to the tip thereof from the retreat position 61B to the chamfering position 61A. Position at 61A. In this state, the center axis 61b of the chamfering tool 61 coincides with the lens rotation center line 5A. FIG. 4 shows this state.

  After positioning the chamfering tool 61, the workpiece feeding mechanism 20 is driven to feed the ground lens material W1 downward and press against the annular ground surface 61a of the chamfering tool 61 to start chamfering. In the chamfering process, the vertical position of the chamfering tool 61 is fixed, the feed amount of the ground lens material W1 held on the work spindle 5 is determined by numerical instructions from the controller 50, and the chamfering tool 61 is ground at a predetermined feed rate. The lens material W1 is fed. Therefore, the chamfering amount is controlled by a numerical instruction from the controller 50.

  After the chamfering process is completed, the chamfered lens material is retracted upward by the work feeding mechanism 20. Thereafter, the rotary actuator 66 of the chamfering mechanism 60 is driven to move the chamfering tool 61 from the chamfering position 61A toward the retracted position 61B and return to the retracted position 61B.

  Thus, in the lens grinding apparatus 1 with the chamfering mechanism of this example, the chamfering process is performed on the ground lens material W1 held by the lens holder 3 of the work spindle 5 following the spherical grinding process. it can. Therefore, after spherical grinding, when the ground lens material W1 is removed from the lens holder 3 and attached to the rotating shaft of the chamfering device for chamfering, or the ground lens material W1 removed from the lens holder 3 is chamfered. Unlike the case where it is performed manually, chamfering can be performed efficiently. In addition, it is possible to construct a chamfering mechanism having an inexpensive configuration as compared with the case where a chamfering device is provided independently or when a chamfering rotary shaft is installed in addition to a work spindle.

(Another example of chamfering mechanism)
FIG. 5 is a perspective view showing another example of the chamfering mechanism 60. The chamfering mechanism 60A shown in this figure is of a slide type, and moves the chamfering tool 61 to a chamfering position 61A and a retreating position 61B along a linear movement path. In other words, the chamfering mechanism 60 </ b> A is supported by the slider 72 in which the chamfering tool 61 is movable along the guide rail 71 in the horizontal direction. The slider 72 is driven by a linear motion mechanism such as an air cylinder (not shown). Since the other parts are the same as those shown in FIGS. 1 and 2, the corresponding parts are denoted by the same reference numerals and description thereof is omitted.

  In addition, as a moving mechanism for moving the chamfering tool 61 in the chamfering mechanism 60 to the chamfering position 61A and the retreating position 61B, a swivel arm type moving along the arcuate locus as described above, or a linear In addition to the slide type that moves along the locus, various types of moving mechanisms can be employed.

It is a schematic block diagram which shows the principal part of the lens grinding apparatus with a chamfering mechanism to which this invention is applied. It is a perspective view which shows the chamfering mechanism of the lens grinding apparatus with a chamfering mechanism of FIG. It is explanatory drawing which shows the spherical grinding operation | movement of the lens grinding apparatus with a chamfering mechanism of FIG. It is explanatory drawing which shows the chamfering operation | movement of the lens grinding apparatus with a chamfering mechanism of FIG. It is a perspective view which shows another example of a chamfering mechanism. It is explanatory drawing which shows grinding by the conventional spherical surface creation method.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lens grinding apparatus with a chamfering mechanism, 3 Lens holder, 4 Grinding dish, 4a Spherical grinding surface, 4A Grinding dish rotation center line, 5 Work spindle, 5A Lens rotation center line, 20 Work feed mechanism, 21 Horizontal arm, 31 Ball swinging body, 33 support plate, 33a annular inner peripheral surface, 33b compressed air blowing hole or groove, 35 swing width adjusting unit, 36A rotation center line, 37 swing angle adjusting unit, 60, 60A chamfering mechanism, 61 Chamfering tool, 61a Tapered annular grinding surface, 61b Center axis, 61A Chamfering position, 61B Retraction position, 62 Tool arm, 63 Vertical rotation axis, 64 Bearing, 65 Support block, 66 Rotary actuator, 67 Slider, 68 Rail, 69 Air cylinder, 71 guide rail, 72 slider, W lens material, 1 grinding already lens material, O spherical center

Claims (5)

A grinding pan with a spherical grinding surface;
A grinding pan spindle which supports the grinding pan and is arranged in a state where the central axis passes through the spherical center of the grinding surface;
A ball swinging body supporting the grinding plate spindle;
A rocking mechanism for rocking the spherical rocking body so that the central axis of the grinding pan spindle rotates on a conical surface having the spherical center as a vertex;
A grinding pan rotating mechanism for rotating the grinding pan spindle about a central axis;
A lens holder that holds the lens material to be processed and is arranged so that the center axis passes through the spherical center;
A workpiece feeding mechanism for feeding the lens holder along the central axis toward the grinding pan;
A workpiece rotation mechanism for rotating the lens holder around its central axis;
A chamfering mechanism for chamfering a ground lens material obtained by grinding the lens material with the grinding plate,
The chamfering mechanism is
A chamfering tool with an annular tapered grinding surface;
A tool moving mechanism for moving the chamfering tool to a chamfering position whose center axis coincides with the center axis of the lens holder, and a retreating position retracted from the chamfering position;
A chamfering feed mechanism for moving the chamfering tool relative to the lens holder in the direction of the center axis thereof,
When the lens holder holding the ground lens material is returned in a direction away from the grinding plate, the chamfering tool can be disposed between the ground lens material and the grinding plate. A lens grinding device with a chamfering mechanism. In claim 1,
The tool grinding mechanism moves the chamfering tool along a linear or curved movement path, a lens grinding apparatus with a chamfering mechanism. In claim 1,
The lens grinding apparatus with a chamfering mechanism, wherein the chamfering feed mechanism is a chamfering tool feed mechanism that reciprocates the work feed mechanism and / or the chamfering tool in the direction of the feed axis. In claim 1,
A numerical controller that numerically controls the feeding operation of the lens holder by the workpiece feeding mechanism;
A lens grinding apparatus with a chamfering mechanism, wherein the numerical control unit controls a feed amount of the ground lens material to the chamfering tool to determine a surface size of the ground lens material. A method for using the lens grinding apparatus with a chamfering mechanism according to any one of claims 1 to 4,
Rotate the grinding pan and swing the ball center,
Sending out the lens material held by the lens holder at a predetermined feed speed and pressing it against the grinding surface of the grinding pan that is rotating and pivoting around the ball,
While feeding the lens material pressed against the grinding pan at a predetermined cutting feed speed, grinding the lens material,
The ground lens material obtained by applying a predetermined grinding process is returned in the direction away from the grinding pan,
The chamfering tool is moved from the retracted position to be positioned at the chamfering position,
Feeding the ground lens material held by the lens holder and pressing it against the tapered grinding surface of the chamfering tool at the chamfering position;
While feeding the ground lens material pressed against the chamfering tool at a predetermined cutting feed speed, the ground lens material is subjected to chamfering grinding,
Release the ground lens material after chamfering from the chamfering tool,
Thereafter, the chamfering tool is retracted from the chamfering position to the retracted position, and the lens grinding apparatus with a chamfering mechanism is used.

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