EP1693151A2 - Chantourneuse pour verres de lunettes - Google Patents

Chantourneuse pour verres de lunettes Download PDF

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Publication number
EP1693151A2
EP1693151A2 EP06001492A EP06001492A EP1693151A2 EP 1693151 A2 EP1693151 A2 EP 1693151A2 EP 06001492 A EP06001492 A EP 06001492A EP 06001492 A EP06001492 A EP 06001492A EP 1693151 A2 EP1693151 A2 EP 1693151A2
Authority
EP
European Patent Office
Prior art keywords
spectacle lens
spring
push rod
component
spectacle
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
Application number
EP06001492A
Other languages
German (de)
English (en)
Other versions
EP1693151B1 (fr
EP1693151A3 (fr
Inventor
Frank Dr.-Ing. Janetta
Ralf Werner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Buchmann Deutschland GmbH
Original Assignee
Buchmann Deutschland GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Buchmann Deutschland GmbH filed Critical Buchmann Deutschland GmbH
Publication of EP1693151A2 publication Critical patent/EP1693151A2/fr
Publication of EP1693151A3 publication Critical patent/EP1693151A3/fr
Application granted granted Critical
Publication of EP1693151B1 publication Critical patent/EP1693151B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • B24B9/148—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 electrically, e.g. numerically, controlled

Definitions

  • the invention relates to a spectacle lens edge grinding machine having a spectacle lens holding shaft for grinding the spectacle lens to be ground, at least one grinding wheel movable in CNC control with respect to the spectacle lens holding shaft, and an adjusting device for grinding pressure during edge processing of a spectacle lens held in the spectacle lens holding shaft.
  • a spectacle lens edge grinding machine of the type mentioned above can be removed, which has at least one with respect to the spectacle lens holding shaft controlled by a computer undeliverable grinding wheel by means of an electric servomotor, in which the grinding pressure is variable by changing the torque transmitted from the actuator. It may be a torque-controlled servo motor, or it may be arranged a torque-controlled coupling between the servo motor and the deliverable grinding wheel. By means of a position transducer for the delivery of the grinding wheel and a data connection to the computer, the grinding pressure can be controlled in dependence on the instantaneous radius of the spectacle lens touching the grinding wheel.
  • the grinding pressure can be adjusted depending on the radius of the spectacle lens touching the grinding wheel in the sense of enlarging from a large radius to a small radius.
  • the angle of the instantaneous contact point of the spectacle lens on the grinding wheel with the axis connecting the axes of rotation of the spectacle lens holding shaft and the grinding wheel may be taken into account in terms of increasing the grinding pressure at or opposite to the angle of rotation of the grinding wheel.
  • This known spectacle lens edge grinding machine requires a precise torque-controllable servo motor or a precise torque-controllable coupling between the servo motor and the deliverable grinding wheel, whereby the control effort and the manufacturing costs are increased.
  • DE 694 09 327 T2 describes a spectacle lens edge grinding machine in which a main spring applying at least two-thirds of the grinding pressure is arranged between the machine frame and a rocker supporting the spectacle lens holding shaft.
  • the grinding pressure of the main spring should remain essentially constant.
  • an additional spring is arranged between an adjusting device and the rocker, whose bias can be adjusted by means of the device between a value zero and a maximum value of about one third of the total grinding pressure. This makes it possible to make the grinding pressure between a minimum value of about two thirds of the maximum value and set the maximum value.
  • Adjustment device allows in this way, the grinding pressure during the To reduce spectacle lens machining from a maximum value to the value caused by the main spring.
  • the invention is based on the object to provide a spectacle lens edge grinding machine of the type mentioned, which makes do with a simplified grinding force control and correspondingly simplified components, yet has a large control range for the grinding force and is therefore less expensive to manufacture.
  • a spectacle lens edge grinding machine with a spectacle lens holding shaft holding the spectacle lens and at least one grinding wheel which can be moved by CNC control with respect to the spectacle lens holding shaft which comprises a grinding wheel and spectacle lens holding shaft adjustment device attached to a machine frame of the spectacle lens edging machine movable by the adjustment, cooperating with a motion-coupled to the spectacle lens support shaft or the grinding wheel component connecting rod, at least one arranged between the push rod and the component, solely the grinding pressure generating spring and a predetermined distance between the push rod and the component adjusting or a predetermined spring force adjusting Having control device.
  • the adjustment device for the distance between the grinding wheel and the spectacle lens holding shaft and the control of a predetermined distance between the setting device and the spectacle lens holding shaft or a predetermined spring force between the adjusting device and the grinding wheel or the spectacle lens holding shaft are simple components that can be produced inexpensively and their control by the Control device requires no major effort.
  • To set the predeterminable spring force may be arranged on the spring or between the push rod and the component, a force sensor.
  • a respective displacement sensor can be arranged in the region of the push rod and in the region of the component, from whose signals the distance is determined and set to the predefinable value.
  • the workability of the glass material can be controlled. If the speed at which the push rod moves to the glass-form-dependent radial end value is too high, a gap is created between the push rod and the component interacting therewith.
  • the gap size is used for the motion control of the push rod, wherein the gap width determines the spring tension and thus the grinding pressure. If the gap width is kept constant, irrespective of the cutting ability of the grinding wheel and the ability to process the spectacle lens material, a constant grinding force results, which is independent of the distance between the spectacle lens holding shaft and the grinding wheel. Only when reaching the final shape, the gap width drops to zero, resulting in a signal for the end of the machining process.
  • the control device By means of the control device, it is possible to adjust the gap width as a function of the instantaneous spectacle lens radius in contact with the grinding wheel, that is, to increase the grinding force as the radius becomes smaller. Likewise, the instantaneous edge width of the spectacle lens can be taken into account in the control of the grinding pressure by adjusting the gap width.
  • a spring biasing device which is preferably attached to a holder on the push rod and cooperates with a displaceable member to which the spring is attached.
  • the setting of the spring preload is changed as a function of the spectacle lens material and remains constant during the processing of the respective spectacle lens.
  • the measuring force be considerably smaller must - two parallel springs between the push rod and the component can be arranged and provided in the position of the largest distance between the lens holding shaft and the grinding wheel with one of the springs engageable, fixed to the machine frame holding device.
  • the second spring which may preferably have a smaller spring constant than the first spring.
  • the spring can engage a component of the cross slide movable in the direction of the spectacle lens holding shaft.
  • the cooperating with the adjusting, displaceable member to which the spring is fixed may consist of a displaceable on the push rod, provided with a threaded hole holder for the spring, wherein a rotatable by the adjusting threaded rod engages in the threaded bore.
  • a holder for the springs can be attached to a movable in the direction of the spectacle lens holding shaft member with a passage opening for one of the springs, which can be attached to a holder on the bracket is, be arranged, wherein the angle piece has an opening for the engagement of a locking lever of the holding device. If the latching lever is brought into engagement with the angle piece, the spring associated therewith is disengaged from the holder on the component which can be moved in the direction of the lens holding shaft and thus rendered ineffective, so that only the second, weaker spring exerts the force for moving the grinding wheel in the direction of the grinding wheel Apply spectacle lens holding shaft. This reduced spring force is required when polishing the lens edge and when measuring a spectacle lens.
  • the drawing shows a schematic side view, partially in section, of a spectacle lens edge grinding machine according to the invention.
  • a cross slide 2 On a machine frame 1, a cross slide 2 is arranged, the slide part 3 guide rods 4, which are slidably mounted in bores 5 of lugs 6 of the slide member 7 radially to a spectacle lens support shaft 14 with one held, formschlleifenden raw glass 25.
  • the slide part 7 is arranged via guide rails 8 to the machine frame 1 in a direction parallel to the lens holding shaft 14 and a shaft 10 for a roughing wheel 11 and a coaxially arranged finished and / or bevel grinding wheel 12.
  • the shaft 10 is mounted by means of bearing supports 9 on the carriage part 3.
  • the grinding wheels 11, 12 and the raw glass 25 with its shafts 10, 14 are surrounded by a housing 13, which at the bottom has a trough, not shown in detail, which prevents coolant and grinding abrasion from reaching the region of the cross slide 2.
  • an angle sensor 15 is connected, which is connected via a signal line 44 to a computer 16 in conjunction.
  • a displacement transducer 17 is arranged on the machine frame 1 in the region of a component 27 connected to the slide part 7 and absorbs the radial displacement of the slide part 3 relative to the lens holding shaft 14. This displacement sensor 17 is also connected to the computer 16 via a signal line 39.
  • peripheral contour values for a wide variety of spectacle lens shapes can be entered and stored as polar coordinates and used to control the grinding of the rough glass 25 until the finished spectacle lens shape designated by the reference numeral 43 is reached.
  • An adjusting device 18 for the distance between the lens holding shaft 14 and the grinding wheel 11 or 12 is fixed to the machine frame 1.
  • This adjusting device 18 is connected via a control line 36 to the computer 16, which adjusts a push rod 19 according to the shape of the finished spectacle lens 43.
  • This push rod 19 is arranged coaxially with the guide rod 4.
  • the guide rod 4 is pulled by means of the spring 29, 30 against the push rod 19.
  • a holder 27 is fixed to the guide rod 4, on which the spring 30 engages directly.
  • the second spring 29 is guided on the holder 27 through a passage opening 28 and secured to an elbow 31.
  • the angle 31 has an opening 32 into which an actuatable by means of an actuator 33 locking lever 34 can engage.
  • an adjustment device 42 is fastened by means of a holder 22.
  • the adjusting device 42 can be a threaded rod 24 to rotate, which rests in a threaded bore of a holder 23 for the springs 29, 30.
  • This holder 23 is slidably guided on the push rod 19, so that it can not rotate when turning the threaded rod 24.
  • the spring bias of the springs 29, 30 can be adjusted independently of the movement of the push rod 19.
  • the adjustment of the spring preload by means of the adjusting device 42 serves to the spectacle lens material when adjusting the grinding pressure to take into account.
  • the adjusting device 42 is adjusted by the computer 16 via a control line 37.
  • the position of the holder 23 and thus the push rod 19 with respect to the machine frame 1 is received by means of a position sensor 35 and passed via a signal line 41 to the computer 16. Furthermore, the position of the guide rods 4 and thus of the grinding wheels 11, 12 is received with respect to the machine frame 1 via a displacement sensor 17 and passed via a signal line 39 to the computer 16.
  • a transducer 26 for the lens width is arranged in the region of the glass tube 25, which is connected via a signal line 40 to the computer 16.
  • a generally circular raw glass 25 is clamped in the spectacle lens holding shaft 14 and brought into contact with the pre-grinding wheel 11.
  • the spectacle lens holding shaft 14 with the glass 25 clamped therein is rotated in a known manner, wherein the rotational speed is usually 10 to 13 U / min.
  • the angle encoder 15 transmits the computer 16 at equal angular intervals, z. B. in increments of 6 degrees, a pulse, whereby the calculator 16 is caused to adjust the associated, to be ground radius of the peripheral contour 24 via the adjusting device 18 with the push rod 19.
  • the push rod 19 is slowly moved by the adjustment device 18, controlled by the computer 16 in such a way that adjusts a predetermined gap between the end of the push rod 19 and the end of the guide rod 4, which remains constant, if the Schleiflcraft regardless of the instantaneous radius of the raw glass 25 should remain constant.
  • This grinding force corresponds to the biasing force of the two springs 29, 30 preset by means of the adjusting device 42, since the spring 30 is fixedly connected to the holders 23 and 27 and the spring 29 is firmly connected to the holder 23 and the angle piece 31 bears against the holder 27, when the detent lever 34, as shown, is disengaged from the opening 32.
  • the distance between the end of the push rod 19 and the guide rod 4 is kept constant by the computer 16 on the basis of a desired value input and the signals transmitted by the displacement sensors 17 and 35.
  • the grinding pressure is to be variable as a function of the instantaneous edge width of the raw glass 25 to be processed and of the instantaneous radius, this can be effected by a corresponding programming of the computer 16.
  • the grinding pressure with a large edge width and depending on the instantaneous radius of the raw glass 25 to be processed can be changed in the sense that the grinding pressure is increased with a large margin width and small radius without the risk of displacement of the raw glass 25 with respect to the lens holder shaft 14, while still grinding the rough glass 25 at the highest possible speed.
  • the carriage part 7 can be moved controlled by the computer 16 in the direction of the guide rails 8.
  • an unillustrated drive via a control line 21 to the computer 16 is connected.
  • the spring force acting between the grinding wheels 11, 12 and the spectacle lens holding shaft 14 is to be changed to a greater extent, for example, if a polishing operation is performed, or if a raw glass 25 or a finished spectacle lens 43 measured by placing on a support 45 motion-coupled to the slide member 3 to be, the spring force is significantly reduced by the fact that the spring 29, which has a significantly higher spring constant than the spring 30 is rendered ineffective.
  • the guide rod 4 is brought by means of the adjusting device 18 and the push rod 19 in the position shown in the drawing, in which the opening 31 in the elbow 31 is aligned with the locking lever 34.
  • the actuating device 33 By triggering the actuating device 33 via the control line 38, the latching lever 34 is brought into engagement with the opening 32.
  • the push rod is driven by the adjuster 18 to the left, acts on the guide rod 4 only the significantly weaker spring force of the spring 30, since the holder 27 lifts off the held by the locking lever 34 elbow 31 and the spring 29 is thus ineffective.
  • the grinding wheels 11, 12 are mounted on the cross slide 2, however, the invention extends to the reverse embodiment in which the grinding wheels 11, 12 rotatably but otherwise immovably mounted on the machine frame 1, while the lens support shaft 14 with respect to the grinding wheels 11, 12, for example, on a cross slide, can be stored.
EP20060001492 2005-02-17 2006-01-25 Chantourneuse pour verres de lunettes Expired - Fee Related EP1693151B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510007523 DE102005007523A1 (de) 2005-02-17 2005-02-17 Brillenglasrandschleifmaschine

Publications (3)

Publication Number Publication Date
EP1693151A2 true EP1693151A2 (fr) 2006-08-23
EP1693151A3 EP1693151A3 (fr) 2006-11-29
EP1693151B1 EP1693151B1 (fr) 2008-04-23

Family

ID=36572252

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060001492 Expired - Fee Related EP1693151B1 (fr) 2005-02-17 2006-01-25 Chantourneuse pour verres de lunettes

Country Status (3)

Country Link
EP (1) EP1693151B1 (fr)
DE (2) DE102005007523A1 (fr)
ES (1) ES2304029T3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2216133A1 (fr) * 2009-02-04 2010-08-11 Nidek Co., Ltd. Appareil de traitement de l'objectif à loupe
WO2013174468A2 (fr) 2012-05-22 2013-11-28 Satisloh Ag Procédé de polissage de pièces, notamment de polissage avec centrage de pièces telles que des lentilles optiques
CN112091762A (zh) * 2020-08-25 2020-12-18 浙江欧亚光电科技有限公司 一种对太阳能板铝边打磨可调节机构

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19616536A1 (de) 1996-04-25 1997-11-06 Wernicke & Co Gmbh Verfahren und Brillenglasrandschleifmaschine zum Formschleifen des Umfangsrandes von Brillengläsern und zum ggf. anschließenden Facettenschleifen
DE69409327T2 (de) 1993-10-19 1998-11-19 Essilor Int Brillenglasrand-Schleifmaschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10138108A (ja) * 1996-10-31 1998-05-26 Nidek Co Ltd 眼鏡レンズ研削加工機及び眼鏡レンズ研削加工方法
JP2003340698A (ja) * 2002-05-30 2003-12-02 Hoya Corp レンズ加工装置及びレンズ加工方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE69409327T2 (de) 1993-10-19 1998-11-19 Essilor Int Brillenglasrand-Schleifmaschine
DE19616536A1 (de) 1996-04-25 1997-11-06 Wernicke & Co Gmbh Verfahren und Brillenglasrandschleifmaschine zum Formschleifen des Umfangsrandes von Brillengläsern und zum ggf. anschließenden Facettenschleifen

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2216133A1 (fr) * 2009-02-04 2010-08-11 Nidek Co., Ltd. Appareil de traitement de l'objectif à loupe
US8241091B2 (en) 2009-02-04 2012-08-14 Nidek Co., Ltd. Eyeglass lens processing apparatus
WO2013174468A2 (fr) 2012-05-22 2013-11-28 Satisloh Ag Procédé de polissage de pièces, notamment de polissage avec centrage de pièces telles que des lentilles optiques
DE102012010004A1 (de) 2012-05-22 2013-11-28 Satisloh Ag Verfahren zum Schleifen von Werkstücken, insbesondere zum zentrierenden Schleifen von Werkstücken wie optischen Linsen
US9278421B2 (en) 2012-05-22 2016-03-08 Satisloh Ag Method for grinding workpieces, in particular for centering grinding of workpieces such as optical lenses
CN112091762A (zh) * 2020-08-25 2020-12-18 浙江欧亚光电科技有限公司 一种对太阳能板铝边打磨可调节机构

Also Published As

Publication number Publication date
ES2304029T3 (es) 2008-09-01
DE102005007523A1 (de) 2006-08-24
EP1693151B1 (fr) 2008-04-23
DE502006000656D1 (de) 2008-06-05
EP1693151A3 (fr) 2006-11-29

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