US3899851A - Machines for edge-trimming and bevelling spectacle lenses - Google Patents

Machines for edge-trimming and bevelling spectacle lenses Download PDF

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US3899851A
US3899851A US372996A US37299673A US3899851A US 3899851 A US3899851 A US 3899851A US 372996 A US372996 A US 372996A US 37299673 A US37299673 A US 37299673A US 3899851 A US3899851 A US 3899851A
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Prior art keywords
bezel
arm
lens
support
follower
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US372996A
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Robert Raymond Maurice Asselin
Pierre Henri Leon Asselin
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Asselin P H L
Asselin R R M
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Asselin P H L
Asselin R R M
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Priority claimed from FR7223305A external-priority patent/FR2191453A5/fr
Priority claimed from FR7316695A external-priority patent/FR2229213A6/fr
Application filed by Asselin P H L, Asselin R R M filed Critical Asselin P H L
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B33/00—Severing cooled glass
    • C03B33/02—Cutting or splitting sheet glass or ribbons; Apparatus or machines therefor
    • C03B33/04—Cutting or splitting in curves, especially for making spectacle lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B17/00—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor
    • B24B17/10—Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like; Accessories therefor involving electrical transmission means only, e.g. controlled by magnetic tape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms
    • B24B9/144—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms the spectacles being used as a template

Definitions

  • each frame bezel is analysed preferably by movable feeler, the position of which is so controlled that the feeler point is constantly homologous with the grinding point on the lens irrespective of any unevennes in the surface of the bezel.
  • the copying transmission chain for slaving the lens support preferably includes automatically operating calibration or initial setting members.
  • the present invention relates to an apparatus for manufacturing optical lenses and in particular to apparatus for contouring lenses to match the bezel of the spectacle frames.
  • the lens grinding pressure against the grinding wheel is provided directly by the pressure of a mechanical feeler on the frame bezel.
  • the grinding pressure has to be low and cannot exceed a few hundred grams, thereby resulting in very long grinding times and frequent deformation of the frame bezel under the pres sure of the feeler.
  • the operator may wish to have the option of producing a lens according to a template, in which case he is compelled to remove the copying assembly and fit a template support in its place;
  • the frame support provides only one connection for imparting rotation, so that only one eye of the frame chosen arbitrarily can be properly positioned on the support.
  • the feeler is supported by a hinged lever the radius of which is equal to the grinding wheel radius and the hinge point of which corresponds substantially with the centre of the grinding wheel and is pulled downwardly by a spring or counterweight in such manner that the feeler be always returned to the lowermost point of the frame corresponding with the point of contact of the lens with the grinding wheel.
  • the two ends of the bezel are not always perfectly aligned; flash is frequently present at the weld spot, so that when the bezel joint arrives beneath the feeler the latter is accidently entrained.
  • the rotation of the frame tends to shift the feeler in the direction of rotation, so that there is invariably a certain amount of drift in the sensing point that varies according to the coefficient of friction between the bezel and the feeler.
  • a further object provides for the spectacle frame to be mounted horizontally on its support, which support is mechanically independent of the grinding machine lensholder allowing grinding of thetwo lenses without reversing either the frame or the lenses.
  • a lens grinding machine comprises two sections which are independent mechanically.
  • the first portion includes a horizontal frame support which is rotated by a motor through one of two quickly engageable parts which are independently adjustable and correspond to the two frame eyes respectively.
  • a fixed feeler follows the bezel of each eye in succession.
  • the frame support is provided on the end of an arm movable in a horizontal plane, and the position of this arm is measured by a sensor which, subsequent to transmission to a second machine section with power amplification, mechanically controls the position of a further similar arm carrying a motor for rotating the lens to be ground, said motor being caused to rotate synchronously with the frame support motor by suitable synchronization means.
  • the frame can be replaced by a template consisting of a thin sheet mounted on a suitable support similar to the frame support, the contour of this sheet being followed by' a mechanical feeler; alternatively, said sheet may merely bear a contour tracing which can be followed by a preferably optical or magnetic contactless sensor.
  • the bezel feeler means may be movable and comprise means for so slaving its position that the sensing point be at all times homologous with the grinding point on the corresponding lens.
  • the sensing point to be determined by the slaving means can be defined either as the extreme point on the bezel in a direction homologous with the grinding-wheel and lens centerline or as the point on the bezel at which the tangent thereto is perpendicular to the straight line homol ogous with the straight line joining the centre of the grinding-wheel to the contact point thereof with the lens being ground.
  • the direction of the tangent can be determined by a sensor for measuring the position of auxiliary feelers which feel the bezel on either side of the main feeler and define a bezel secant very close to the tangent sensing or feeling point.
  • the direction of said tangent can be determined mathematically by differentiating the successively varying radii of the bezel in polar coordinates, preferably with respect to the centre of the bezel, and this with the help of an auxiliary computer.
  • the feeling arm of a feeler device is preferably possessed of continuous transverse or orthogonal low-amplitude high-frequency vibration with respect to the bezel of the spectacle frame.
  • Such vibration allows the feeler arm to pass more readily over bezel surface irregularities and helps to obtain the desired position of the sensing point. It can be used with advantage, moreover, to so control the copying chain of the machine as to cause copying to be effected only at the lowermost point on the bezel.
  • such calibration is accomplished through the agency of means which adjust the system for slaving the motions of the arm supporting the lens-carrier by copying the motions of the arm supporting the frame carrier.
  • This adjusting means permits the initial setting of one of the arms with respect to the other to be selectively adjusted.
  • the adjusting means are preferably electrically operating means such as resistors or potentiometers affecting the copying chain.
  • the intermittent adjusting means can provide either intermittent adjustment to allow adapting to grindingwheels of different heights or radii, or continuous adjustment to provide compensation for variable differences resulting, say, from wear on the grinding-wheels.
  • the intermittent adjusting means are controlled by a machine operation program determined according to the type of finish required for the lenses.
  • FIG. 1 schematically illustrates the two sections A and B of a lens grinding machine according to the invention
  • FIG. 2 is a section through the line IIII in FIG. 1, showing the spectacle-frame support of the machine and its driving means;
  • FIG. 3 is a section through the line IIIIII of FIG. 1, showing the same frame support
  • FIG. 4 shows the frame support of FIG. 2 removed from the machine and placed on a flat surface
  • FIG. 5 schematically'portrays a section A in which the frame is replaced by a mechanical template
  • FIG. 6 schematically portrays a section A in which the frame is replaced by a sheet bearing a tracing of the desired contour
  • FIG. 7 collectively illustrates in diagrammatic form a spectacle frame, the associated feeler, a lens and a grinding-wheel forming part of a machine for trimming the edges of spectacle lenses;
  • FIG. 8 shows a first embodiment of movable feeler means according to the invention
  • FIG. 9 shows a second embodiment of movable feeler means according to the invention.
  • FIG. 10 shows a third embodiment of movable feeler means according to the invention.
  • FIG. 11 shows a fourth embodiment of movable feeler means according to the invention.
  • FIG. 12 shows a fifth embodiment of movable feeler means according to the'invention
  • FIGS. 13A and 138 show detail XIII of FIG. 10 on an enlarged scale, in two different positions;
  • FIG. 14 is a top view of a position sensor suitable for the subject of FIGS. 13A and 138;
  • FIG. 15 is a sectional view through the line XVXV of the subject of FIG. 14;
  • FIG. 16 portrays detail XVI of FlGi l'l'on an enlarged scale.
  • a machine consists of two sections: a section A in which the shape of the spectacle-frame bezels is analysed and a sectionB in' which the lenses are ground accordingly. In FIG. 1, these sections are separated by a dot-dash line. Section A is shown as a top view and section B as a side elevation view.
  • a frame support 1 comprises a horizontal baseplate 3 on which a spectacle frame 2 is fixed in the flat position and beneath which are'mounted, substantially underneath each eye of the frame, two similar driving parts 4 and 5.
  • a sleeve 6 engages with and is elastically latched to a sleeve 6 with which it is made angularly rigid by studs 7 on sleeve 6 engaging into corresponding recesses 8 in part 5.
  • Sleeve 6 is rotatable in a bearing supporting ballbearin gs 10, 11 on the end of a horizontal arm 9 pivotally mounted about a fixed vertical pin 12 extending through its other end.
  • An electric motor 13 fixed to arm 9 rotates sleeve 6, part 5 and frame support 1 relatively to said arm through a drive pinion 14 meshing with a gearwheel 15 of large diameter secured fast with said sleeve.
  • Said motor may be a stepwise motor or a synchronous motor.
  • a frame feeler point 16 is carried on the end of a vertical rod 17 extending through sleeve6 and through an opening 18 formed in part5.
  • the point 16 is applied against the bottom of the bezel 19 of the frame eye corresponding to part 5.
  • Rod 17 is extended by a horizon- ,tal rod 20 which may be caused to slide'i'n a fixed support 21 by means of a' hand lever 22 hingedly connected to the end of rod 20.
  • 'Lever 22 controls the setting inthe work position of feeler 16 in beze'l 19 by pulling on rod 20 until an annular stop 23 on said rod contacts the support 21.
  • the spectacle lens to be ground 26 is held in the vertical plane of grinding-wheel 28 by a support I20 on the end of an arm 29 which is pivotable about a horizontal pin 30 extending through its other'end.
  • This arm is similar to the arm 9 of frame support I, being of frame 2 (via its support 1) about the axis ofs leeve 6.
  • motor 31 which is energized at the same time as motor 13, is caused to rotate'synchronously therewith by synthronizationmeans 44 setting the lens 26 in identical rotation with the frame 2.
  • synthronizationmeans 44 setting the lens 26 in identical rotation with the frame 2.
  • the lens shares the angular motions of arm 29, controlled by' stop 35'on arm 36, with the cooperation or the weight 34, the motions copying those of arm 9, the lens is ground by grindingwheel 28 in strict conformity with the contour of the bezel 19 for which it is intended.
  • the work is facilitated through the use of a frame support which is independent of the grinding machine.
  • a frame support which is independent of the grinding machine.
  • Such an arrangement can be adapted to existing spectacle lens grinding machines more readily and more cheaply.
  • it allows templatejobs to be performed without any dismantling operations.
  • the copying chain interconnecting unit A and I'.llt B can be devised with the most appropriate transn sion and amplification components, the latter being p: .Leraequal length thereto and likev'vise comprising an elecdriven by any convenient means 38 such as an electric,
  • the motor 38 could provide the required grinding pressure itself.
  • the spectacle frame 2 is first se cured flat on its support l and the feeler 16 is appliedby means' of the lever 22 against the bottom of the bezel 19 to which the lens to be ground 26 must be matched, the appropriate'initial bly mechanical, hydraulic, optical, magnetic, e ctric, photoelectric or electronic.
  • the frame support 1 comprises two rotation imparting parts 4, 5, each corresponding to one of the spectacle-frame eyes.
  • the two lenses are ground by simply engaging the parts 4 and 5 into the sleeve 6 in succession, without manipulating the frame or reversing one of the lenses, each lens being ground to match the bezel for which it is intended.
  • the position of each of the two parts 4, 5 is laterally adjustable by independent micrometer-screw controls 45, 46, and is identified by means of pointers 47, 48 fixed to parts 4 and 5 respectively and graduated scales '49, 50 carried on a member 51 of support I.
  • the transverse position of frame 2 on plate 3 is determined by an abutment strip 52 slidable along guides 53, 54 and positionally adjustable by means of micrometer screw means 55 with locating graduation marks 62.
  • the frame 2 is applied against strip 52, then secured by means of horizontally and vertically acting means 56 and 57 respectively.
  • adjustment means 45, 46 and 55 allow all desired offsets, it is possible, in the case of each frameeye, to fetch the rotation centre of the frame into the appropriate position in relation to the bezel, which position corresponds to the optical centre of the lens to be ground.
  • the spectacle frame can be offset in any desired degree relative to its rotation axis makes it possible to position the centre of the lens to be ground on the rotation axis of the lens about itself, in such manner that, regardless of its curvature, the lens remain in a plane perpendicular to its rotation axis,
  • each of the two parts 4, 5 to be engaged with drive sleeve 6 allows the operator to rapidly fit or remove the support 1; moreover, the frame support is devised so that it can be properly positioned flat on a table.
  • the frame support is devised so that it can be properly positioned flat on a table.
  • the angular setting of arms 9 and 36 can be verified by means of indiator means 58 and 59, and that of motors l3 and 31 by indicator means 60 and 61.
  • indicator means 60 and 61 are angle encoders or devices which deliver a signal that becomes null when synchronism is achieved.
  • a machine according to this invention is likewise capable of grinding spectacle lenses, not on the basis of the frame but of a template replacing either the frame or the customary template. Whereas the latter is designed to withstand the grinding pressure, the substitute template can in this case be made of a thin sheet of metal or rigid plastic by reason of the low feeler pressure being greatly below the grinding pressure.
  • FIG. 5 shows such a template 63 fixed to an appropriate support 121 carried on the end of an arm 9 devised and actuated as heretofore described (FIG. 1 like parts bearing like reference numerals. Template 63 is convex, and a point on its outer contour contacts a feeler head 64 replacing the bezel feeler 16 and likewise convex, its radius of curvature being preferably equal to that of the grinding-wheel.
  • This head 64 is mounted on the end of a rod 20 which can be moved longitudinally by a lever 22 identical to the lever in FIG. 1, with the same associated parts 21, 23, and 40.
  • Template 63 is applied against the head 64 by a spring 24a corre sponding to spring 24 but exerting an oppositely directed force on arm 9.
  • the manner of operation of a machine section A devised as above is similar to that of the machine section A previously described (FIG. 1).
  • template 63 can be replaced by a thin sheet 65, such as a sheet of paper, on which is inscribed the desired lens contour 66 (FIG. 6).
  • Sheet 65 is fixed to a support 122 likewise carried on the end of an arm 9 as hereinbefore described but devoid of a return spring 24 or 24a.
  • the lower part 67 of contour 66 is distinguished from the rest of sheet 65 by a simple physical property, being for instance black on a white background, or vice versa; alternatively it may have magnetic properties different from those of the remainder of the sheet.
  • the feeler is an appropriate detector 68, such as an optical or magnetic detector.
  • arm 9 is possessed of the same motions as in the previous embodiments (FIGS. 1 and 5), and the remainder of the machine is unchanged.
  • arm 9 may remain stationary, in which case the head 68 is movable and its motions impart identical motions to the lens support.
  • the two sections A and B of a machine according to this invention may, by virtue of their indirect interconnection via a remote copying chain, be dissociated and not used concurrently, in which case the data issuing from section A and defining the shape of a spectaole-frame bezel are stored in a memory such as a punched-tape or magnetic-tape recorder.
  • the recording obtained is then applied to section B in such manner that the lens support be actuated in the way hereinbefore described.
  • an A-section can be associated to two or more B-sections and drive the same synchronously.
  • FIG. 7 shows that, in order to ensure that the lens 26 is ground in exact conformity with the bezel 19 for which it is intended, the feeler point 70 on bezel 19 must at all times be homologously positioned with the grinding point 71 on lens 26. But because, as the grinding operation proceeds, the grinding point 71 recedes in variable manner from the centerline 72 joining the centre 73 of grinding-wheel 28 to the centre 74 of lens 26, the feeler point 70 on bezel 19 must shift correspondingly in relation to the line 75 joining the centre 76 of bezel 19 to the point 77 homologous with the grinding-wheel centre 73. If the feeler point 16 is carried on an arm 78 substantially equal in length to the radius of grinding-wheel 28 and capable of pivoting about the.
  • the arm 78 carrying the feeler 16 is made to continuously vibrate about its end 77 by convenient drive means such as an electromechanical generator with rotating weights, an electromagnetic vibrator,an ultrasonics generator, or any other convenient means.
  • This vibration is of high frequency and low amplitude and can be adjusted according to the type of spectacle frame.
  • the mean position of the feeling point is thereby made independent of the surface condition of the bezel or of une vennesses thereon. It is to be understood that this vibratory motion can be applied to all the slaved feeler devices with mechanical feeling points to be described hereinbelow with reference to FIGS. 10 through 12.
  • FIG. 8 further shows that the end 77 of arm 78 is guided linearly along the axis 75, within appropriate means 79 for detecting the position of the point 77.
  • This position detector is so coordinated with the copying-chain for controlling the position of the lens before the grinding-whee] that the copying data is transmitted to the lens supporting arm only when the position of point 77 is farthest from the bezel in the course of a complete excursion of feeler 16, the latter being then located at the extreme point on the bezel in the direction of axis 75, i.e., at the point homologous with grinding point 71 (FIG. 7).
  • the feeler point homologous with the grinding point 71 is defined in similar manner in the feeler system shown in FIG. 9.
  • This system comprises a series of suitable contacts or proximity detectors 80 which ara capable of exploring the interior of bezel 19 and are positioned one after the other along a circular are 81 homologous with the periphery of grinding-wheel 28, on a support 82 which is provided with an arm 83 sliding along the axis 75 responsively to drive means 84.
  • the latter acts on the overall position of the detectors 80 under servo control means in such manner that, in that particular position, only one of the detectors 80A may lie facing the interior of bezel 19.
  • the feeler devices of FIGS. 10 and 11 differ little from each other. They comprise a mechanical feeler point 16, closely flanked on either side by two auxiliary feeler points 85 capable of sliding parallel to the axis of supporting arm 78 and continuously applied by elastic means against the inside of bezel 19. Supporting arm 78 is pivotable about its end 77 and its position is governed by rotation imparting means 86 controlled by slaving means on the basis of position sensors associated to the auxiliary feeler points 85, thereby causing the Straight line joining the ends thereof (which virtually merges with the tangent 87 to the bezel) to remain perpendicular to the axis of arm 78. When this is the case, the position of the feeling point is homologous with the grinding point 71 (FIG. 7). Two corresponding exemplary embodiments will be described in greater detail hereinbelow.
  • FIG. 12 shows an alternative embodiment in which a single feeler point 16 is carried on the end of arm 78 which is capable of pivoting about its end 77 responsively to drive means 86.
  • the tangent 87 to bezel 19 is defined mathematically by a-computer on the basis of the variations in the angular position of arm 9 carrying the support for frame 2, in the course of rotation of the latter about the centre 76 if bezel 19, which variations 7 depend on the successive changes in the length of the vector radius 88 joining centre 76 to feeling point 70.
  • the computer so controls the means 86 for driving the arm 78 that the tangent 87 at sensing point 70 remain perpendicular to the axis of arm 78.
  • FIGS. 13A and 13B illustrate'an exemplary embodiment of the arrangement used for the feeler in FIG. 10.
  • the main feeler 16 is provided with two lateral sleeves 89 through which are slidable, parallel to the axis of arm 78, two rods 90 carrying the auxiliary feelers and applied by springs 91 against a common beamlever 92 capable of rocking motion about a central pivot 93 fast with feeler 16.
  • the angle 94 formed by beam-lever 92 with arm axis 78 is measured by an angle sensor, and means for slaving the position of the arm operate on the-basis of this sensor to maintain said angle at An angle sensor usable in this particular application is shown in FIGS. 14 and 15.
  • Beam-lever 92 rotates a disc 95 embodying a hole 96 which is illuminated by a light source 97 beamed in the direction of two photoelectric cells 98 which are positioned so as to receive equal light intensity when the beam-lever defines an angle 94 equal to a right angle.
  • the cells 98 are electrically connected in a differential configuration whereby to drive the means for slaving arm 78.
  • FIG. 16 An exemplary embodiment of the feeler arrangement of FIG. 11 is shown in FIG. 16.
  • the auxiliary feelers are supported as before by sliding rods 90 which are urged towards the bezel by springs 99 and carry photoelectric cells 100 illuminated by a common light source 10] fast with feeler 16, through holes 102.
  • the cells 100 are connected in a differential configuration in order to drive the means for slaving the arm 78, the components 100, 101, and 102 jointly forming a linear position detector for measuring the respective positions of the pair of auxiliary feelers 85 in relation to main feeler 16.
  • the various position detectors or proximity sensors utilized can be electric, magnetic, optical or electronic devices, or devices sensitive to other kinds of waves.
  • the present invention further relates to means for calibrating the feeler device, in order notably to initially set the position of lens 26 before grinding-wheel 28 and that of the feeler 16 which feels the bezel 19 of frame 2.
  • This initial setting must allow for the height or radius of the grinding-wheel and for the different types of grinding surface and shapes of the grinding-wheel, the dimensions of which may differ. Allowance must also be made for gradual wear on the grinding-wheels, which reduces their radius.
  • the machine is provided with relevant adjustment means (FIG. 1) for operating on the copying chain, which chain is preferably controlled automatically by the machine pro gram which selects the desired type of finish and controls the manner in which the lens to be ground is offered up the appropriate grinding-wheel.
  • adjustment means employ switchable resistors 111 which provide intermittent adjustment according to the different grindingwheel radii, and potentiometers 112 which provide continuous fine adjustment to compensate for grindingwheel wear.
  • Such adjustment means likewise provide compensation for other similar parameters affecting the calibration and may provide any desired initial settings.
  • Apparatus for bevelling the edges of a lens in conformance with a predetermined bezel contour comprising a support for holding a member having a bezel contour, means for rotating said bezel support about an axis perpendicular to the mean plane of the bezel member, means for following the contour of said bezel member to sense the shape thereof, a grinding machine having a grinding wheel, a support for holding a lens,
  • each of the bezel member support and lens support being carried on an individually pivotable arm, said means for rotating the corresponding support being mounted on the respective arm and means for copying the shape of said bezel on said lens comprising means interconnecting said means for rotating said lens support and said means for rotating said bezel support rotating said lens synchronously with the rotation of said bezel member, means for simultaneously moving said lens support and said grinding wheel relatively toward each other in response to the sensing of the shape of said contour to cause said grinding wheel to grind said lens into the shape of said bezel and means for controlling the relative pressure between said lens and said grinding wheel independently of the means for following said bezel.
  • the apparatus according to claim 2 including an auxiliary arm associated with the arm carrying said lens support and including adjustable stop means causing said lens support arm and said auxiliary arm to be in at least intermittent mutual contact.
  • the apparatus according to claim 3 including means for exerting on said lens support arm a substantially constant force urging the lens against the grinding wheel.
  • the apparatus according to claim 1 including means for removably attaching said bezel member support on its associated arm comprising a rotatable shaft connected to said means for rotating said support and having resilient latching means for axially restraining said support on said shaft.
  • said bezel member comprises a spectacle frame for which the lens is intended and said means for following the contour of said bezel comprises a feeler adapted to engage the surface of said bezel.
  • the bezel member support carries the frame and comprises two independently rotatable parts, means for separately adjusting the position of each part to rotate in succession about two axes corresponding to the two eyes of the spectacle frame.
  • said bezel member comprises a template havinga shape conforming to the grinding dimensions for a spectacle lens
  • said bezel follower comprises means for sensing the edge of said template.
  • said template comprises-a thin rigid sheet having a peripheral edge and said follower means comprises a feeler adapted to be in physical contact with said edge.
  • said template comprises a sheet on which the contour of said lens is inscribed and said follower is adapted to sense said'i'nsc ription optically and includes a servomotor responsive thereto for controlling the movement of said bezel member support and said follower.
  • the template comprises a sheet on which the contour of said lens is inscribed and said follower is adapted to sense said inscription photoelectrically and which includes a servomotor responsive thereto for controlling the relative motions of the bezel member support and said follower.
  • the template comprises a sheet on which the contour of said lens is inscribed and said follower is adapted to sense said inscription magnetically and including a servomotor in response thereto for controlling the relative motion of the bezel member support and said follower.
  • the apparatus according to claim 2 including sensing means for measuring the movements of the bezel member support arm, said copying means including circuit means for remotely slaving said lens support arm thereto.
  • the apparatus according to claim 16 including means for recording the information issuing from the sensing means, said copying means circuit including playback means for said recording.
  • the follower means includes a feeler adapted to engage the bezel surface, said feeler being mounted on the end of an arm having a length substantially equal to the radius of the grinding wheel and being pivotable about the point homologous with the center of the grinding wheel, said feeler beingflanked by two adjacent auxiliary feelers movable in the direction of said arm, a detector for detecting the respective positions of said feel- 22.
  • the detector detects the relative position of the feelers in a direction parallel to that of the arm.
  • the follower means includes a feeler adapted to engage the edge of said bezel.
  • said feeler being carried by an arm having a length substantially equal to the grinding wheel radius.
  • said arm being pivotable in response to said slaving means and a computer responsive to the angular motion of the arm carrying the bezel member support for determining the derivative of the curve of the bezel contour.
  • the follower means includes a mechanical feeler having a point, said mechanical feeler being mounted on the end of an arm having a length substantially equal to the grinding wheel radius.
  • the follower means comprises a series of proximity sensors capable of exploring the interior of the bezel, a sliding support for said proximity sensors, said sensors being positioned in succession along a circular arc homologous with the grinding wheel periphery, said sliding support being movably translationally along a straight line homologous with the center line in response to slaving means until said support is brought into that position farthest from the bezel in which only one follower explores the inside of the bezel.
  • the apparatus according to claim 28 including means for adjusting the position of said arm continuously.
  • the apparatus according to claim 28 including means for intermittently adjusting the position of said arm.
  • the apparatus according to claim 30 including means for automatically activating said intermittent adjustment means in accordance with a predefined lens

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Eyeglasses (AREA)
US372996A 1972-06-28 1973-06-25 Machines for edge-trimming and bevelling spectacle lenses Expired - Lifetime US3899851A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7223305A FR2191453A5 (en, 2012) 1972-06-28 1972-06-28
FR7316695A FR2229213A6 (en) 1973-05-09 1973-05-09 Optical lense grinder - with copying mechanism for spectacle rim

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US3899851A true US3899851A (en) 1975-08-19

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US372996A Expired - Lifetime US3899851A (en) 1972-06-28 1973-06-25 Machines for edge-trimming and bevelling spectacle lenses

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US (1) US3899851A (en, 2012)
JP (1) JPS4957473A (en, 2012)
CA (1) CA981907A (en, 2012)
DE (1) DE2332001C3 (en, 2012)
GB (1) GB1403348A (en, 2012)
IT (1) IT992591B (en, 2012)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027434A (en) * 1973-05-29 1977-06-07 Coburn Optical Industries, Inc. Edging apparatus for ophthalmic lens
US4051601A (en) * 1975-01-10 1977-10-04 Essilor International, Cie Generale D'optique Feeler for contour reading apparatus
US4300317A (en) * 1980-01-10 1981-11-17 American Optical Corporation Method of fitting ophthalmic lenses in spectacles frames
US4557076A (en) * 1983-05-06 1985-12-10 Otto Helbrecht Grinding machine for the rims of spectacle lenses
JPS62169009A (ja) * 1986-01-21 1987-07-25 Nippon Kogaku Kk <Nikon> 眼鏡フレ−ムの玉型測定装置
JPS62215814A (ja) * 1986-03-18 1987-09-22 Nippon Kogaku Kk <Nikon> 眼鏡フレ−ムのレンズ玉型形状測定装置
US5660578A (en) * 1994-03-15 1997-08-26 Essilor International Compagnie Generale D'optique Method for determining the lens grinding error and contour follower reading error to calibrating a lens trimming machine
US5993294A (en) * 1996-04-25 1999-11-30 Wernicke & Co. Gmbh Method and spectacle lens grinding machine for shape grinding the circumferential edge of spectacle lenses and optionally for subsequently grinding a facet
US6283826B1 (en) * 1998-05-29 2001-09-04 Nidek Co., Ltd. Eyeglass lens grinding apparatus
US6315642B1 (en) * 2000-04-13 2001-11-13 Briot International Method and apparatus for the tracing of spectacle frames, and corresponding grinding machine
WO2007045734A1 (fr) * 2005-10-20 2007-04-26 Briot International Appareil de palpage d'une monture de lunettes et machine de meulage associee
CN109333224A (zh) * 2018-10-15 2019-02-15 湖北宏旭伟业电子科技有限公司 一种基于手机显示屏加工用显示屏磨边机

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52124290A (en) * 1976-04-13 1977-10-19 Koken Kk Lens processing machine provided with device for removing interference of grinding wheel
JPS5345791A (en) * 1976-10-07 1978-04-24 Koken Kk Lens working machine provided with device for removing interference of grind stone
JPS5639858A (en) * 1979-09-07 1981-04-15 Aichi Steel Works Ltd Grinder for end face of steel
DE3105100C2 (de) * 1981-02-12 1984-04-12 Hoya Lens Corp., Tokyo Maschine zum Schleifen einer Nut in die Umfangsfläche eines unrunden Brillenglases
JPS57158829A (en) * 1981-03-27 1982-09-30 Hoya Corp Production of glasses
GB2117287B (en) * 1981-10-07 1985-11-06 Victor Freeman Lens edge grinding machine
JPS60150957A (ja) * 1984-01-14 1985-08-08 Koken:Kk レンズ加工機
LU85494A1 (fr) * 1984-08-10 1986-03-11 Henri Snackers Procede et appareil destine a faciliter le meulage des verres de lumettes
FR2570973B1 (fr) * 1984-10-03 1987-01-09 Briot Int Perfectionnements aux machines a meuler les verres de lunettes.
FR2573225B1 (fr) * 1984-11-09 1987-02-06 Briot Int Procede et dispositif pour stabiliser la vitesse de meulage de la peripherie des verres de lunettes sur une machine comportant une copieuse
DE3774730D1 (de) * 1986-01-30 1992-01-09 Topcon Corp Verfahren und einrichtung zum schleifen von linsen.
DE8608291U1 (de) * 1986-03-26 1986-05-07 Wernicke & Co GmbH, 4000 Düsseldorf Tasteinrichtung zum Abtasten der Kontur von Brillengestellöffnungen
US4711035A (en) * 1986-08-04 1987-12-08 Gerber Scientific Products, Inc. Method and apparatus for making a pattern for a lens opening in an eyeglass frame
GB2194909B (en) * 1986-08-14 1991-01-09 Gerber Scient Products Inc Optical lens pattern making system and method
US4724617A (en) * 1986-08-14 1988-02-16 Gerber Scientific Products, Inc. Apparatus for tracing the lens opening in an eyeglass frame
JPH02198755A (ja) * 1989-12-28 1990-08-07 Topcon Corp レンズ枠形状測定装置
JP2925685B2 (ja) * 1990-08-02 1999-07-28 株式会社ニデック フレーム形状測定装置
JP2907974B2 (ja) * 1990-08-28 1999-06-21 株式会社ニデック 眼鏡フレームトレース装置
JPH07100290B2 (ja) * 1992-03-16 1995-11-01 株式会社トプコン レンズ研削装置およびレンズ研削方法
JPH0815706B2 (ja) * 1992-07-27 1996-02-21 株式会社トプコン レンズ枠形状測定装置
JPH09174408A (ja) * 1997-01-31 1997-07-08 Topcon Corp フレーム形状測定装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3170374A (en) * 1962-04-26 1965-02-23 Russell M Malamut Apparatus for producing lens patterns from spectacle frame lens openings
US3461619A (en) * 1966-05-10 1969-08-19 Textron Inc Edge-grinding machine for lenses
US3555739A (en) * 1968-09-16 1971-01-19 Ezra H Novak Machine for shaping, sizing and finishing the edge of a lens blank
US3672855A (en) * 1970-11-30 1972-06-27 Charles R Bright Glass lens edging apparatus
US3786600A (en) * 1972-10-02 1974-01-22 Lemay A Co Inc Contour grinder
US3807098A (en) * 1972-06-14 1974-04-30 Sundstrand Syracuse Plural grinding stations with master controller

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3170374A (en) * 1962-04-26 1965-02-23 Russell M Malamut Apparatus for producing lens patterns from spectacle frame lens openings
US3461619A (en) * 1966-05-10 1969-08-19 Textron Inc Edge-grinding machine for lenses
US3555739A (en) * 1968-09-16 1971-01-19 Ezra H Novak Machine for shaping, sizing and finishing the edge of a lens blank
US3672855A (en) * 1970-11-30 1972-06-27 Charles R Bright Glass lens edging apparatus
US3807098A (en) * 1972-06-14 1974-04-30 Sundstrand Syracuse Plural grinding stations with master controller
US3786600A (en) * 1972-10-02 1974-01-22 Lemay A Co Inc Contour grinder

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4027434A (en) * 1973-05-29 1977-06-07 Coburn Optical Industries, Inc. Edging apparatus for ophthalmic lens
US4051601A (en) * 1975-01-10 1977-10-04 Essilor International, Cie Generale D'optique Feeler for contour reading apparatus
US4300317A (en) * 1980-01-10 1981-11-17 American Optical Corporation Method of fitting ophthalmic lenses in spectacles frames
US4557076A (en) * 1983-05-06 1985-12-10 Otto Helbrecht Grinding machine for the rims of spectacle lenses
JPS62169009A (ja) * 1986-01-21 1987-07-25 Nippon Kogaku Kk <Nikon> 眼鏡フレ−ムの玉型測定装置
JPS62215814A (ja) * 1986-03-18 1987-09-22 Nippon Kogaku Kk <Nikon> 眼鏡フレ−ムのレンズ玉型形状測定装置
US5660578A (en) * 1994-03-15 1997-08-26 Essilor International Compagnie Generale D'optique Method for determining the lens grinding error and contour follower reading error to calibrating a lens trimming machine
US5993294A (en) * 1996-04-25 1999-11-30 Wernicke & Co. Gmbh Method and spectacle lens grinding machine for shape grinding the circumferential edge of spectacle lenses and optionally for subsequently grinding a facet
US6283826B1 (en) * 1998-05-29 2001-09-04 Nidek Co., Ltd. Eyeglass lens grinding apparatus
US6315642B1 (en) * 2000-04-13 2001-11-13 Briot International Method and apparatus for the tracing of spectacle frames, and corresponding grinding machine
WO2007045734A1 (fr) * 2005-10-20 2007-04-26 Briot International Appareil de palpage d'une monture de lunettes et machine de meulage associee
FR2892332A1 (fr) * 2005-10-20 2007-04-27 Briot Internat Sa Appareil de palpage d'une monture de lunettes et machine de meulage associee
CN109333224A (zh) * 2018-10-15 2019-02-15 湖北宏旭伟业电子科技有限公司 一种基于手机显示屏加工用显示屏磨边机
CN109333224B (zh) * 2018-10-15 2020-05-19 湖北宏旭伟业电子科技有限公司 一种基于手机显示屏加工用显示屏磨边机

Also Published As

Publication number Publication date
CA981907A (en) 1976-01-20
JPS4957473A (en, 2012) 1974-06-04
DE2332001B2 (de) 1979-10-25
IT992591B (it) 1975-09-30
DE2332001A1 (de) 1974-01-17
GB1403348A (en) 1975-08-28
DE2332001C3 (de) 1980-07-10

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