JP4429469B2 - Lens peripheral processing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lens periphery processing apparatus for grinding a periphery of a lens to be processed into a lens shape such as a lens frame shape or a template shape of glasses.
[0002]
[Prior art]
As a conventional lens peripheral edge processing apparatus, for example, the one shown in FIG. 8 is considered (see Japanese Patent Laid-Open No. 10-249694). In FIG. 8, bearing portions 50 and 51 are provided in a processing apparatus main body (not shown), and a support shaft (swivel shaft) 52 is rotatably held by the bearing portions 50 and 51 via bearings 53 and 54. Yes. A cylindrical shaft 55 is fitted to the outer periphery of the support shaft (swivel shaft) 52 so as to be movable in the axial direction, and a swing arm 56 and a carriage 57 are fixed to the cylindrical shaft 55. Further, lens rotation shafts 58 and 59 are coaxially and serially held on the carriage 57. The swing arm 56 is moved up and down by an elevating means (vertical moving means) 60 based on the target lens shape data. With this vertical movement, the peripheral edge of the lens L to be processed (unprocessed spectacle lens) sandwiched (held) between the lens rotation shafts 58 and 59 is ground into a target shape by the grindstone 61. Yes.
[0003]
In such a conventional lens periphery processing apparatus, the raising / lowering means (vertical movement means) 60 of the swing arm 56 also serves as the origin sensor of the carriage 57, and the position where the swing arm 56 contacts the elevation means 60 (origin sensor). Is used as a starting point to move the swing arm 56 from the position by a necessary amount, so that the lens rotation shaft 58 held by the carriage 57 on the opposite side of the swing arm 56 with the support shaft (swing shaft) 52 as the center. , 59 are moved down to the grindstone 61, and the lens to be processed (unprocessed lens) L sandwiched between the lens rotation shafts 58, 59 is processed into a lens shape such as a lens frame shape or a template shape of a spectacle frame.
[0004]
[Problems to be solved by the invention]
That is, in the conventional lens peripheral edge processing apparatus, the lifting means (origin sensor) 60 is on the opposite side of the lens rotation shafts 58 and 59 with the support shaft (oscillation shaft) 52 interposed therebetween. Due to deformation or the like, there is a problem that an accurate carriage origin, that is, a machining origin essential for precise lens processing, is not required, and high-precision lens grinding cannot be performed.
[0005]
Therefore, while maintaining the entire configuration of the conventional lens peripheral edge processing apparatus, the swing sensor is used by arranging the origin sensor on the lens rotation shaft / grinding wheel shaft side and directly detecting the relative relationship between the lens rotation shaft and the grinding wheel shaft. An object of the present invention is to provide a lens peripheral edge processing apparatus that can obtain an accurate carriage origin, that is, a lens processing origin, by avoiding the effects of insufficient rigidity and thermal deformation of the lens, and capable of performing high-precision lens grinding. And
[0006]
[Means for Solving the Problems]
In order to achieve this object, the invention of claim 1 is directed to a lens rotation shaft for sandwiching a lens to be processed, a carriage having the lens rotation shaft and capable of turning about the turning shaft, and for turning the carriage. A grindstone for grinding a working lens sandwiched by a lens rotation shaft of a carriage swiveled by the carriage swiveling means and a carriage swiveling means provided on the opposite side of the carriage with the swiveling axis as a center In a lens peripheral edge processing apparatus having a shaft, an origin detection means for detecting the origin of the carriage is provided between the lens rotation shaft and the grindstone shaft.
[0007]
The invention according to claim 2 is characterized in that the origin detection means is contact type detection means provided between the lens rotation shaft and the grindstone shaft.
[0008]
Further, the invention of claim 3 is characterized in that the origin detection means is a proximity switch provided between the lens rotation shaft and the grindstone shaft.
[0009]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1
Embodiment 1 of the present invention will be described below with reference to the drawings.
<Grinding part>
FIG. 4 shows the appearance of the lens peripheral edge processing apparatus according to the present invention. In FIG. 4, reference numeral 1 denotes a housing body of the ball grinder, 2 denotes an inclined surface provided on the upper front side of the main body 1, 3 denotes a liquid crystal display unit provided on the right half of the inclined surface 2, 4 denotes an inclined It is a keyboard part provided in the lower right part of the surface 2.
[0010]
A processing chamber A is provided in the main body 1, and the circular grinding wheel 5 shown in FIG. 1 is disposed in the processing chamber A. The grindstone 5 is rotatably held by the main body 1 at a position not shown. The grindstone 5 includes a rough grindstone 6 and a V-groove grindstone 7. The grindstone 5 is fixed to a grindstone shaft 70 that is a rotation output shaft of the motor 8, and is rotated by the motor 8.
[0011]
In addition, as shown in FIG. 3, brackets 10 and 11 for mounting the shaft are integrally provided on the frame (not shown) in the processing chamber A. The brackets 10 and 11 hold bearings 10 </ b> B and 11 </ b> B that are fitted to both left and right ends of a support shaft (oscillation shaft or swivel shaft) 12. Further, a cylindrical shaft (swinging cylindrical shaft) 13 is fitted to the outer periphery of the support shaft 12 so as to be movable in the axial direction and not relatively rotatable around the axial line. This structure for preventing relative rotation can be achieved by a known technique such as using a key and a key groove, or spline fitting. Thereby, the cylinder shaft 13 and the support shaft 12 can rotate integrally around the axis, and the cylinder shaft 13 can move (slide) on the support shaft 12 in the longitudinal direction.
[0012]
In the processing chamber A, a carriage 15 positioned above the grindstone 5 is disposed, and a plate-like swing arm 300 is disposed.
[0013]
The carriage 15 includes a carriage body 15a, arms 15b and 15c that are integrally provided on both sides of the carriage body 15a and parallel to each other, and a rear edge portion center of the carriage body 15a. A projection 15d is provided. The cylindrical shaft 13 described above penetrates the protrusion 15d to the left and right and is fixed to the protrusion 15d. As a result, the front end of the carriage 15 can be turned up and down (up and down) about the support shaft 12.
[0014]
A lens rotation shaft 16 is rotatably held on the arm portion 15 b of the carriage 15, and a lens rotation shaft 17 disposed coaxially and in series with the lens rotation shaft 16 is held on the arm portion 15 c of the carriage 15. ing. The lens rotation shaft 17 is held on the arm portion 15c so as to be rotatable and adjustable relative to the lens shaft 16. Thereby, the lens L to be processed is sandwiched between the opposed ends (between one end portions) of the lens rotation shafts 16 and 17.
[0015]
The lens rotation shafts 16 and 17 are rotationally driven by a shaft rotation driving device (shaft rotation driving means). The rotation driving device is fixed in a carriage 15a, and a pulse motor 18 and a pulse motor 18 are fixed. Is transmitted to the lens rotation shafts 16 and 17.
[0016]
As shown in FIG. 1, the power transmission mechanism 19 includes a timing belt 23 stretched over timing pulleys 20 and 22 attached to lens rotation shafts 16 and 17, and a gear 24 fixed to the rotation shaft 21. , And an output pinion 25 for the pulse motor 18.
<Swing arm 300>
The swing arm 300 is formed from a plate-like body. At both ends in the left-right direction (Z direction) of the swing arm 300, as shown in FIG. Semi-circular holding portions 301 a and 302 a are provided at the front ends of the protrusions 301 and 302, and the holding portions 301 a and 302 a are fitted to both ends of the cylindrical portion 13. The holding portions 301a and 302a are fixed to the cylindrical portion 13 by fixing means such as screws or adhesives (not shown).
<Finish sensor (finish detection means)>
A finishing sensor 301 for detecting the vertical rotation position of the carriage 2 is disposed as a finishing detecting means at the rear end of the swing arm 300.
[0017]
The finish sensor 301 includes a housing (box) 302 fixed to the rear end portion of the swing arm 300, and a photo interrupter disposed in one end portion of the housing 302 as shown in FIGS. (Detection sensor) 303, a light shielding plate 304, and a support shaft 305 that supports an intermediate portion of the light shielding plate 304 and supports both ends of the light shielding plate 304 in a seesaw manner so as to be vertically rotatable.
[0018]
The photointerrupter 303 includes a light emitting element (light emitting means) 303a and a light receiving element (light receiving means) 303b as shown in FIGS. Further, the light shielding plate 304 has a shaft-shaped receiving member 306 fixed to one end portion, and has a light shielding portion 304a bent upward at the other end. The light shielding plate 304 has a structure in which, for example, a support shaft 305 is fixed to an intermediate portion of the light shielding plate 304, and the support shaft 305 is rotatably held by the housing 302, so that the seesaw type can be rotated up and down. It is supported by the housing 302 so that it can move.
<Grinding amount setting means (carriage lifting / lowering means)>
Above the shaft receiving member 306 of the finishing sensor 301 described above, a grinding amount setting means 307 for setting the grinding amount of the lens L to be processed is disposed as a carriage turning means. The grinding amount setting means 307 includes an internal thread cylinder 308 that is held on the main body 1 side so that the axis extends vertically and can move up and down at a position (not shown) and cannot rotate around the axis. A shaft portion 309 projecting downward from the lower end, a spherical pressing member 310 integrally provided at the lower end of the shaft portion 309, a pulse motor 311 fixed to the main body 1 at a position not shown, and a pulse motor A feed screw 312 is provided integrally with the output shaft 311 a of 311 and screwed into the female screw cylinder 308.
<Origin detection mechanism (origin detection means)>
Further, as shown in FIGS. 1 and 2, an origin detection mechanism B is interposed between the grindstone shaft 70 that is the rotation shaft of the motor 8 and the lens rotation shaft 17. As shown in FIG. 2, the origin detection mechanism B includes a cylinder unit 71 and a piston rod unit 72 protruding from the cylinder unit 71.
[0019]
The cylinder unit 71 includes a cylinder body 73, a cylinder portion 74 that is provided integrally with a lower end portion of the cylinder body 73 and orthogonal to the axis of the cylinder body 73, and the cylinder portion 74 is rotatably held on the grindstone shaft 70. And an end wall 76 attached to the upper end of the cylinder body 73, and a proximity switch (proximity sensor, origin sensor) 77 attached to the end wall 76. The cylindrical portion 74 cannot be moved in the axial direction of the grindstone shaft 70 by a retaining ring or the like. Further, the proximity switch 77 can be supported on the end wall 76 using a screw member or the like so as to be movable and adjustable in a direction parallel to the axis of the cylinder body 73. In this case, the screw member may be screwed onto the end wall 76 in parallel with the axis of the cylinder body 73, and the proximity switch disposed in the cylinder body 73 may be attached to the lower end of the screw member. In this way, the detection position can be adjusted accurately.
[0020]
The piston rod unit 72 includes a piston 78 slidably disposed in the cylinder body 73, a piston rod 79 that is integral with the piston 78 and protrudes upward through the end wall 76, and an upper end of the piston rod 79. And a support portion 81 for supporting the tube portion 80 on the lens rotating shaft 17.
[0021]
The support means 81 has a linear bush 81a that can be relatively moved in the longitudinal direction of the lens rotation shaft 17, and a bearing 81b that rotatably holds the cylindrical portion 80 on the linear bush 81a. Thus, the cylindrical portion 80 is supported so as to be rotatable with respect to the lens rotating shaft 17 and the cylindrical portion 80 is supported so as to be relatively movable in the axial direction of the lens rotating shaft 17. This is because when the lens rotation shaft 17 is moved in the axial direction so that the lens L to be processed is sandwiched between the lens rotation shafts 16 or 17 or the lens L to be processed is removed from between the lens rotation shafts 16 and 17. This is because the lens rotation shaft 17 and the cylindrical portion 80 need to be relatively movable.
[0022]
In this origin detection mechanism B, the lens rotating shaft 17 is moved upward before lens processing, the upper surface of the piston 78 is detected by a proximity switch (origin sensor) 77 at the upper end inside the cylinder body 73, and the position thereof is compared with the grindstone shaft 70. The origin is between the lens rotation axes 17.
<Diamond shape measurement unit (Diamond shape measuring means)>
The target lens shape measuring unit (frame shape measuring unit) 46 includes a pulse motor 47, a rotating arm 48 attached to the output shaft 47 a of the pulse motor 47, a rail 49 held by the rotating arm 48, and the rail 49. A filler support 50 that is movable in the longitudinal direction, a filler 51 (contact) mounted on the filler support 50, an encoder 52 that detects the amount of movement of the filler support 51, and the filler support 51 in one direction. A spring 53 biasing the
[0023]
In addition, instead of configuring the target lens shape measuring unit 46 integrally with the lens processing device, or configuring the lens shape measuring unit 46 separately from the lens processing device and electrically connecting them, the lens frame shape separate from the lens processing device The lens frame shape data measured by the measuring device may be temporarily input to a floppy disk or IC card, and the lens processing device may be provided with a reading device that reads data from these storage media. You may comprise so that lens frame shape data can be input into a lens processing apparatus online.
<Electrical component>
The calculation control circuit 100 (control means, calculation means, conversion means) of the electrical part D includes a drive controller 101 for driving and controlling the motor 8, the pulse motors 18, 311 and the like of the grinding part, a frame data memory 102, FPD / PD input device 103 for inputting the frame PD value FPD and the interpupillary distance value PD of the wearer, the frame material input device 104 for inputting that the spectacle frame is a cell frame, and the frame material A correction value memory 105 that stores a predetermined correction value C and a processing data memory 106 that stores processing data (Pi, Θi) for processing the lens L are connected. The light emitting element (light emitting means) 303 a is controlled to emit light by the arithmetic control circuit 100, and detection signals from the light receiving element (light receiving means) 303 b and the proximity switch 77 are input to the arithmetic control circuit 100.
[0024]
The FPD / PD input device 103 may be a manual input device such as a numeric keypad input device, or an online input from an optometry device or a reading device from optometry data storage means such as a floppy disk or an IC card. Good.
[0025]
Moreover, when the operation controller 100 operates the drive controller 101 to generate a drive pulse from the pulse generator 106 and operate the pulse motor 47, the rotating arm 48 is rotated. Thereby, the feeler 51 is moved along the inner periphery of the lens frame RF or LF of the spectacle frame F (spectacle frame).
[0026]
At this time, the amount of movement of the feeler 51 described above is detected by the encoder 52 and input to the frame data memory 102 of the electrical component D as the radial length _f ρ _i , and the same pulse as that supplied from the pulse generator 106 to the pulse motor 47 is received. The rotation angle of the rotating arm 48, that is, the radial angle _f θ _i is input to the frame data memory 102 and stored as lens shape data ( _f ρ _i , _f θ _i ) of the lens frame (or template). ing.
[0027]
Second Embodiment of the Invention
5 to 8 show the second embodiment of the present invention. The second embodiment of the present invention is the same as the first embodiment of the invention except that the origin detection mechanism B in the first embodiment of the invention is changed. Therefore, the same parts as those of the first embodiment of the invention are described. Are denoted by the same reference numerals as those in the first embodiment of the invention, and the description thereof is omitted.
[0028]
The origin detection mechanism C according to the second embodiment of the present invention includes a plate-like body 90 having a slit 90a that is substantially the same as the shaft diameter of the lens rotation shaft 17, as shown in FIGS. The slit 90a is elongated in the vertical direction. Moreover, the plate-like body 90 is rotatably held on the grindstone shaft 70 via the radial bearing 91. The radial bearing 91 is held by the grindstone shaft 70 so as not to move in the axial direction via the retaining ring 92.
[0029]
Further, the lens rotating shaft 17 is inserted into the slit 90a so as to be movable up and down and rotatable and relatively movable in the axial direction. Further, a support member 93a protruding into the upper end portion of the slit 90a is attached to the upper end portion of the plate-like body 90, and a contact switch (origin sensor) 93 located in the upper end portion of the slit 90a is detected by the origin point on the support member 93a. It is attached as a means. The contact switch 93 is formed in a square shape, and is disposed so that the side surface can substantially contact the inner side surface of the slit 90a. The support member 90a is extended in the direction in which the slit 90a extends. The support member 93a is formed of a screw member or the like that can be moved forward and backward in the direction in which the slit 90a extends, and the support member 90a is rotated about the axis to move forward and backward in the axial direction, thereby forming the slit of the contact switch 93. The position in the longitudinal direction (vertical direction) in 90a can be adjusted. In this way, the detection position can be accurately adjusted.
[0030]
In this origin detection mechanism C, the lens rotation shaft 17 performs an arc motion around the rotation center in the cross-sectional view, but the slit 90a of the plate-like body 90 keeps the relationship with the lens rotation shaft 17 constant. Positioning by the contact switch 93 can be performed. That is, before processing the lens, the lens rotation shaft 17 is brought into contact with the contact switch 93 at the upper end portion of the slit 90 a to be detected, and the position is set as the origin between the grindstone shaft 70 and the lens rotation shaft 17.
[0031]
【The invention's effect】
According to the present invention, the origin sensor is arranged on the lens rotation shaft / grinding wheel shaft side, and the means for directly detecting the relative relationship between the lens rotation shaft and the grinding wheel shaft is used. Therefore, the accurate origin of the carriage and hence the lens processing origin can be obtained, and high-precision lens grinding can be performed.
[Brief description of the drawings]
FIG. 1 is a control circuit diagram of a lens periphery processing apparatus according to Embodiment 1 of the present invention.
2 is a partially enlarged perspective view showing a part of a main part of the inter-axis distance detecting mechanism of FIG.
3A is a perspective view showing a relationship between the swing arm of FIG. 1 and a finish sensor, FIG. 3B is an enlarged perspective view of the finish sensor of FIG. 1A, and FIGS. 3C and 3D are views of the finish sensor. It is an operation explanatory view.
FIG. 4 is a schematic perspective view of a lens peripheral edge processing apparatus having the configuration shown in FIGS.
FIG. 5 is a control circuit diagram of a lens peripheral edge processing apparatus according to Embodiment 2 of the present invention.
6 is a partially enlarged perspective view showing a part of a main part of the inter-axis distance detecting mechanism of FIG.
7 is an operation explanatory diagram of the inter-axis distance detection mechanism of FIGS. 5 and 6. FIG.
FIG. 8 is an explanatory diagram showing an example of a lens peripheral edge processing apparatus.
[Explanation of symbols]
5 ... Grinding wheel 12 ... Support shaft 15 ... Carriage 16, 17 ... Lens rotation shaft 70 ... Grinding wheel shaft 77 ... Proximity switch (origin detection means, origin sensor)
93 ... Contact switch (contact detection means, origin sensor)
307: Grinding amount setting means (carriage turning means)
B, C: Origin detection mechanism L: Lens to be processed (unprocessed eyeglass lens)

Claims (3)

A lens rotation axis for sandwiching the lens to be processed, a carriage provided with the lens rotation axis and capable of turning about a turning axis, and an opposite side of the carriage about the turning axis for turning the carriage A lens periphery processing apparatus having a carriage turning means provided on the grinding wheel, and a grindstone shaft for grinding a lens to be processed that is sandwiched between lens rotation shafts of the carriage turned by the carriage turning means.
An apparatus for processing a peripheral edge of a lens, wherein an origin detecting means for detecting an origin of the carriage is provided between the lens rotation shaft and the grindstone shaft. 2. The lens peripheral edge processing apparatus according to claim 1, wherein the origin detection means is contact-type detection means provided between the lens rotation shaft and the grindstone shaft. 2. The lens peripheral edge processing apparatus according to claim 1, wherein the origin detection means is a proximity switch provided between the lens rotation axis and the grindstone axis.

Images