EP1628803A1 - Verfahren und vorrichtung zum formbearbeiten von brillengl s ern - Google Patents
Verfahren und vorrichtung zum formbearbeiten von brillengl s ernInfo
- Publication number
- EP1628803A1 EP1628803A1 EP04733550A EP04733550A EP1628803A1 EP 1628803 A1 EP1628803 A1 EP 1628803A1 EP 04733550 A EP04733550 A EP 04733550A EP 04733550 A EP04733550 A EP 04733550A EP 1628803 A1 EP1628803 A1 EP 1628803A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spectacle lens
- sensor
- block
- spectacle
- machining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000003754 machining Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000012545 processing Methods 0.000 claims description 37
- 238000007493 shaping process Methods 0.000 claims description 21
- 230000003287 optical effect Effects 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 2
- 239000011521 glass Substances 0.000 description 15
- 238000005259 measurement Methods 0.000 description 11
- 238000006073 displacement reaction Methods 0.000 description 7
- 230000010355 oscillation Effects 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 6
- 230000005284 excitation Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007688 edging Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/16—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the load
Definitions
- the invention relates to a method and a device for shaping spectacle lenses by means of a CNC-controlled spectacle lens processing machine with a spectacle lens holding shaft that holds the spectacle lens by means of a block or suction cup and a processing tool that can be adjusted relative to the spectacle lens holding shaft.
- the machining pressure can be set such that it is just large enough for a large radius of the spectacle lens touching the grinding wheel to prevent the spectacle lens clamped in the spectacle lens holding shaft from slipping, whereby the machining pressure can be increased as the radius becomes smaller and this increases Magnification is dependent on the one hand on the permissible instantaneous torque exerted by the processing pressure on the spectacle lens, but on the other hand must not be so great that the spectacle lens is damaged or even destroyed.
- the processing pressure can be controlled by means of a quantity of data from a computer which also controls the shaping of the spectacle lens by means of this quantity of data.
- the control of the machining pressure can be effected by changing the torque transmitted by the servomotor moving the machining tool relative to the spectacle lens holding shaft, the change in torque being able to be carried out either by means of a torque-controlled servomotor or by means of a torque-controlled coupling between the servomotor and the feedable machining tool.
- the invention described therein is also based on the problem of creating a method and a device for shaping the peripheral edge of spectacle lenses and for possibly subsequently attaching a facet, with which slipping through of the spectacle lens clamped in the spectacle lens holding shaft is reliably avoided, and with which the shaping of the peripheral edge of eyeglass lenses can be carried out as quickly as possible without the risk of breaking or damaging the eyeglass lenses, this method and the device should be designed and constructed in a simple manner and should not require any complicated control.
- the machining force acting on the spectacle lens clamped in the spectacle lens holding shaft always remains below a predeterminable value at which the spectacle lens does not slip through with certainty.
- This method has the advantage that it can also be integrated into a spectacle lens edge processing machine by retrofitting, independently of the control of the mold processing.
- the method according to the invention is independent of whether the shaping of the spectacle lens is CNC-controlled or by copy grinding using a shaping disc.
- the torque of the spectacle lens holding shaft can be measured in different ways, for example by measuring the torque of the drive motor of the spectacle lens holding shaft. This torque is proportional to the current consumption, so that the measurement of the torque can be achieved by measuring the current consumption of the drive motor.
- the torque of the drive motor on the housing of the drive motor can be measured if this housing is rotatably mounted on an elastic support and the path of the elastic support is measured.
- the control of the rotational speed of the spectacle lens holding shaft can either be carried out in such a way that it is reduced proportionally to the exceeding of a predetermined value of the torque or by stopping the spectacle lens holding shaft as long as a predetermined value of the torque is exceeded.
- the device for shaping the peripheral edge of spectacle lenses and, if appropriate, subsequently attaching a facet with a driven spectacle lens holding shaft that holds the spectacle lens and a processing tool that can be moved in relation to the spectacle lens holding shaft has a measuring device for measuring the torque of the spectacle lens holding shaft and a control device for this The force of the processing tool acting on the spectacle lens to reduce this force by reducing the rotational speed of the spectacle lens holding shaft, if necessary to a standstill, if and as long as the torque exceeds a predetermined value.
- the control device can act on the drive of the spectacle lens holding shaft, in the sense of reducing the speed of the spectacle lens holding shaft, possibly until it comes to a standstill.
- the measuring device for measuring the torque preferably has an elastic support for the rotatably mounted housing of the drive motor for the spectacle lens holding shaft, it being possible for a displacement sensor cooperating with the control device to be arranged on the support and the control device for reducing the speed of the spectacle lens holding shaft in proportion to the exceeding of a predetermined path of the encoder.
- a particularly advantageous embodiment of the known device is obtained when the elastic support is pre-tensioned so that movement only when the pre-tension is exceeded, i. H. of the predetermined torque occurs and in which an electrical contact interacts with the elastic support, which interrupts the power supply to the drive motor when the bias voltage is exceeded.
- the method described in DE 199 14 174 AI and the device can be combined with the method described in DE 196 16 536 AI, so that on the one hand the Machining pressure is increased in a controlled manner as a function of the respective radius in the contact area of the spectacle lens touching the machining tool from a large radius to a small radius and, on the other hand, the speed of the spectacle lens holding shaft is possibly reduced to a standstill if and as long as the torque exceeds the predetermined value.
- this method can be carried out, for example, with the system according to DE 195 27 222 C2.
- the determined values of a possible shift of the raw glass on the holder can be compared continuously or in cycles by calculation with a maximum permissible value of the shift, so that the processing of the raw glass then and only if the maximum permissible value of the relocation is exceeded.
- the detection of a displacement of the raw glass on the holder is a sign that the holding force of the raw glass on the holder is too low for the selected machining force and / or machining speed, it can be provided according to a further advantageous embodiment of the method that after the detection If the displacement does not exceed the maximum permissible value, the machining force and / or the machining speed are reduced.
- the invention is based on the problem of creating a method and an apparatus for shaping spectacle lenses with which slipping or displacement of the spectacle lens clamped in the spectacle lens holding shaft is avoided with certainty and with which the shaping of spectacle lenses is carried out as quickly as possible without the risk of breaking or Damage to the lenses taking into account mechanical softness in the system and with possible minor hindrance to the work process is feasible.
- the machining process can be controlled taking into account the measurement values excluding the mechanical softness in the system so that, for example, the infeed of the machining tool and / or the rotation of the spectacle lens holding shaft, if any, and / or the speed of the machining tool, if it is a rotating machining tool, should always be set so that a maximum machining speed is achieved without the risk of damage to the spectacle lens or without producing unusable spectacle lenses, the machining process being hampered as little as possible becomes.
- the invention is based on the idea of obtaining an "intelligent" block or suction device by arranging a sensor in or on the block or suction device, which generates measurement signals which correspond to the load state acting on the spectacle lens during the shaping process, taking advantage of the fact that the block or suction cup deforms more or less depending on the load condition or a pressure corresponding to the load condition acts on the sensor.
- the method defined above can be carried out using an active or passive electronic sensor or using an optical sensor.
- the measured values can be transmitted from the sensor to a transducer without contact or by means of cable connections, plug-in or sliding contacts.
- the device according to the invention for the shaping of spectacle lenses from a CNC-controlled spectacle lens processing machine with an eyeglass lens holding shaft holding the spectacle lens by means of a block or suction cup and a processing tool that can be adjusted in relation to the spectacle lens relative to the eyeglass lens holding shaft has at least one measuring condition that acts on the spectacle lens during the shaping Sensor on, which is arranged in or on the block or suction device and which transmits the measured values to a transducer which forwards the measured values to the CNC control of the lens processing machine in a machine-suitable form.
- the senor is designed as an active electronic component, this can consist of a pressure- or deformation-sensitive, miniaturized electronic circuit.
- the senor consists of a passive electronic or electromechanical component
- this can consist, for example, of a pressure or deformation-sensitive resonant circuit arranged in or on the block or suction device, or of a pressure or deformation-sensitive measuring resistor arrangement.
- a contactless measured value transmission arrangement can be provided from the sensor to the measured value transducer, which can preferably consist of a coil arrangement coupled to the resonant circuit.
- the sensor can preferably consist of at least one reflecting optical component arranged in or on the block or suction cup, onto which light beams are directed, the deflection or scattering of the block or deformation measured by the measurement sensor Suction cups by loading are a measure of the loading condition.
- the measured value pickup can be designed as a CCD camera, from which a light beam emanates and is reflected back onto the CCD camera by the reflecting sensor.
- the CCD camera detects the deflection or scattering of the beam due to the deformation of the block or suction cup due to the load which arises during the machining of the mold and transmits a control signal to the CNC control of the spectacle lens processing machine for controlling the machining process.
- Fig. 1 is a perspective view of an inventive
- FIG. 2 shows a schematic top view, partly in section of a block or suction device, showing a sensor embedded therein,
- Fig. 3 is a schematic side view of the block or sucker according to Figure 2 and
- Fig. 4 is a schematic plan view, partly in section, one
- Spectacle lens processing machine for processing the spectacle lens edge and an optical surface according to a second embodiment.
- a housing 1 is shown of a CNC-controlled spectacle lens edge grinding machine, known per se, shown in FIG. 1, in whose grinding chamber 2 three grinding wheels 3 are arranged on a shaft 4.
- One of the grinding wheels with a cylindrical surface is used to pre-grind the outline shape of a spectacle lens, while the other two grinding wheels are used to grind different roof facets onto the shape-ground spectacle lens.
- Coaxial, rotatable, hollow half shafts 5, 6 are arranged parallel to the shaft 4 with the grinding wheels 3, of which the half shaft 6 is axially displaceable.
- the half-shafts 5, 6 have at their ends holders in the form of holding heads, of which a block or sucker 8 is shown, between which a raw glass 9 can be clamped. The pinching can take place automatically or via a handle 7.
- the spectacle lens holding shaft 5, 6 and the grinding wheels 3 can be set relative to one another for the edge processing of the raw glass 9.
- the peripheral edge is ground in accordance with a predetermined shape of the spectacle lens in a known manner CNC-controlled by means of a control device 12.
- the control device 12 is connected to an input device in the form of a keyboard 14, by means of which the predetermined outline shape, the decentration values and, if given, are used , enter the axis position of a cylindrical or prismatic cut.
- the entered values can be displayed on a monitor 15.
- the block or suction device 8 is placed on the raw glass 9 in a precise position by means of a suitable device and then inserted into the spectacle lens edge grinding machine.
- the block or sucker 8 can, as described in EP 0 235 543 AI, be formed and consist of a toothed flange 23 and a head 24. The teeth 23 and a slot 25 arranged in the head 24 are used for precise positioning with respect to the half shaft 6.
- the block or sucker 8 is made of plastic and a sensor 10 in the form of a resonant circuit made up of an inductor, a capacitor and a resistor is embedded in the head 24.
- a sensor 10 in the form of a resonant circuit made up of an inductor, a capacitor and a resistor is embedded in the head 24.
- an oscillation excitation device 11 is arranged in the half-wave 6 and is connected to a measured value pickup 13. This vibration excitation device 11 can stand still with respect to the half-wave 6 or rotate with it.
- the components of the resonant circuit forming the sensor 10 are arranged in such a way that the resonance frequency of the resonant circuit is changed by the deformation of the block or sucker 8 due to the load occurring during the machining process.
- the oscillation circuit If the oscillation circuit is now excited by the oscillation excitation device 11, the energy introduced into this oscillation excitation device 11 is damped by the oscillation of the oscillation circuit forming the sensor 10.
- the evaluation of the damping or the determination of the respective resonance frequency gives measured values for the deformation of the block or suction pad 8 and thus of the load that occurs during the machining process.
- These measurement signals arrive at the transducer 13 and from there to the control device 12, where they are evaluated for the control of the processing of the lens edge by means of the grinding wheels 3.
- the machining process can be controlled by the control device 12, taking mechanical softness in the system into account, so that the machining is carried out at the greatest possible speed, but without the risk of damage or damage
- the machined spectacle lens 9 becomes unusable and can be carried out with the least possible hindrance to the machining process.
- an active sensor in the form of a pressure- or deformation-sensitive, miniaturized electronic circuit can also be used on the block or sucker 8
- a precise measurement of the forces occurring on the spectacle lens due to the grinding process can be carried out.
- the measurement takes place on-line during grinding, so that the control of the infeed parameters is possible in a closed control loop. Because the measurement is carried out directly on the lens, mechanical softness in the system can be excluded and at the same time the grinding process is hampered as little as possible.
- the measurement can determine the entire voltage state in the block or suction cup 8, i.e. H. which include pressure, shear and compression loads.
- FIG. 4 there is only one hollow shaft 19 with a block or suction pad 20 which is attached on one side to the spectacle lens 9 and covers almost the entire surface thereof.
- the spectacle lens 9 is held on the block or suction cup 18 by means of a vacuum.
- a vacuum connection 21 is provided on the hollow shaft 19.
- the hollow shaft 19 is rotatably mounted on a bearing block 16 fixed to the housing, while the grinding wheels 3 can be adjusted in a manner not shown by means of a control device 12 in a CNC-controlled manner in the X direction and the Z direction.
- a surface processing device 17, which is also controlled by the control device 12, is provided, which is only shown schematically and carries out the processing of the free optical surface of the spectacle lens 9 before or after the edge processing by means of the grinding wheels 3 in a CNC-controlled manner by the control device 12.
- the spectacle lens 9 can be positioned precisely on the block or suction device 18 with the aid of a handling device 26, which is also controlled by the control device 12.
- the block or sucker 18 has a sensor 20 in the form of a reflective optical Elements on.
- a transducer 22 is arranged in the form of a CCD camera.
- a light beam 27 emanates from the CCD camera 22 and strikes the sensor 20 in the form of the reflecting optical element and is reflected back to the CCD camera 22.
- the sensor 20 Due to the deformation of the block or suction cup 18 due to the forces occurring during the processing of the spectacle lens 9 by means of the grinding wheels 3 or the surface processing device 17, the sensor 20 is deformed or deflected in the form of the reflecting optical element, so that the radiation reflected back to the CCD camera 22 28 is scattered or distracted.
- This scattering or deflection is a measure of the load condition of the spectacle lens 9 during the machining process and is passed to the control device 12, which controls the machining process in such a way that even at the maximum machining speed there is no risk of damage to the spectacle lens 9 or becoming unusable.
- the CCD camera 22 can rotate with the hollow shaft 19, so that sliding contacts, not shown, are required for the measured value transmission. If the CCD camera 22 is fixed with respect to the hollow shaft 19, a direct cable connection can be established via plug contacts.
- the measured value transmission in the form of the beams 27, 28 takes place between the sensor 20 and the CCD camera 22 without contact.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Eyeglasses (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10324146A DE10324146B4 (de) | 2003-05-26 | 2003-05-26 | Verfahren und Vorrichtung zum Formbearbeiten von Brillengläsern |
| PCT/EP2004/005336 WO2004103637A1 (de) | 2003-05-26 | 2004-05-18 | Verfahren und vorrichtung zum formbearbeiten von brillengläsern |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1628803A1 true EP1628803A1 (de) | 2006-03-01 |
| EP1628803B1 EP1628803B1 (de) | 2006-12-13 |
Family
ID=33461896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP04733550A Expired - Lifetime EP1628803B1 (de) | 2003-05-26 | 2004-05-18 | Verfahren und vorrichtung zum formbearbeiten von brillengläsern |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1628803B1 (de) |
| AT (1) | ATE347970T1 (de) |
| DE (2) | DE10324146B4 (de) |
| ES (1) | ES2279370T3 (de) |
| WO (1) | WO2004103637A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007152439A (ja) | 2005-11-30 | 2007-06-21 | Nidek Co Ltd | 眼鏡レンズ加工装置 |
| EP4403304A1 (de) * | 2023-01-20 | 2024-07-24 | OptoTech AG | Linsenhalter, schutzfilmentfernungsvorrichtung und verfahren zum lösen eines schutzfilms von einer optischen linse |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58114851A (ja) * | 1981-12-25 | 1983-07-08 | Nakamuratome Seimitsu Kogyo Kk | レンズ芯取機 |
| FR2720021B1 (fr) * | 1994-05-19 | 1996-08-02 | Buchmann Optical Eng | Machine à meuler des verres ophtalmiques comportant des moyens d'asservissement de la valeur de serrage de l'ébauche du verre à meuler. |
| DE19527222C2 (de) * | 1995-07-26 | 1997-09-04 | Wernicke & Co Gmbh | Anlage zum Schleifen wenigstens des Umfangsrandes von Brillengläsern und Verfahren zum rechnerischen Berücksichtigen der Position eines an einem Haltekopf der Anlage gehaltenen Brillenglasrohlings |
| DE19616536C2 (de) * | 1996-04-25 | 2000-01-27 | Wernicke & Co Gmbh | Verfahren und Brillenglasrandschleifmaschine zum Formschleifen des Umfangsrandes von Brillengläsern und ggf. zum anschließenden Facettenschleifen |
| DE19632340C2 (de) * | 1996-08-10 | 2001-02-01 | Wernicke & Co Gmbh | Verfahren zum Formschleifen des Umfangsrandes von Brillengläsern und zum ggf. anschließenden Facettenschleifen |
| DE19914174A1 (de) * | 1999-03-29 | 2000-10-12 | Wernicke & Co Gmbh | Verfahren und Vorrichtung zum Formbearbeiten des Umfangsrandes von Brillengläsern |
| DE10013650C1 (de) * | 2000-03-18 | 2001-11-15 | Wernicke & Co Gmbh | Verfahren zum Bearbeiten von Brillengläsern mittels einer CNC-gesteuerten Brillenglasbearbeitungsmaschine und Vorrichtung zur Durchführung des Verfahrens |
-
2003
- 2003-05-26 DE DE10324146A patent/DE10324146B4/de not_active Expired - Fee Related
-
2004
- 2004-05-18 AT AT04733550T patent/ATE347970T1/de not_active IP Right Cessation
- 2004-05-18 EP EP04733550A patent/EP1628803B1/de not_active Expired - Lifetime
- 2004-05-18 DE DE502004002314T patent/DE502004002314D1/de not_active Expired - Lifetime
- 2004-05-18 WO PCT/EP2004/005336 patent/WO2004103637A1/de not_active Ceased
- 2004-05-18 ES ES04733550T patent/ES2279370T3/es not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2004103637A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2004103637A1 (de) | 2004-12-02 |
| EP1628803B1 (de) | 2006-12-13 |
| DE10324146B4 (de) | 2008-08-14 |
| DE502004002314D1 (de) | 2007-01-25 |
| ES2279370T3 (es) | 2007-08-16 |
| DE10324146A1 (de) | 2005-02-03 |
| ATE347970T1 (de) | 2007-01-15 |
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