EP1595644A1 - Appareil à angle d'inclinaison variable pour chanfreiner et percer des verres optiques ou des verres de lunettes de soleil - Google Patents

Appareil à angle d'inclinaison variable pour chanfreiner et percer des verres optiques ou des verres de lunettes de soleil Download PDF

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Publication number
EP1595644A1
EP1595644A1 EP05010120A EP05010120A EP1595644A1 EP 1595644 A1 EP1595644 A1 EP 1595644A1 EP 05010120 A EP05010120 A EP 05010120A EP 05010120 A EP05010120 A EP 05010120A EP 1595644 A1 EP1595644 A1 EP 1595644A1
Authority
EP
European Patent Office
Prior art keywords
chamfering
lens
machine
tool spindle
axis
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.)
Withdrawn
Application number
EP05010120A
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German (de)
English (en)
Inventor
Stefano Sonzogni
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.)
MEI Srl
Original Assignee
MEI Srl
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 MEI Srl filed Critical MEI Srl
Publication of EP1595644A1 publication Critical patent/EP1595644A1/fr
Withdrawn legal-status Critical Current

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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
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/0031—Machines having several working posts; Feeding and manipulating devices
    • B24B13/0037—Machines having several working posts; Feeding and manipulating devices the lenses being worked by different tools, e.g. for rough-grinding, fine-grinding, polishing
    • 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
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/005—Blocking means, chucks or the like; Alignment devices

Definitions

  • This patent relates to devices for shaping prescription and sunglass lenses and in particular it concerns machines for grinding, chamfering and drilling holes in lenses.
  • every lens needs to be processed in several ways, including: rough grinding, i.e. cutting the lens to suit the shape of the space it occupies in the frames; chamfering, i.e. shaping the edge of the lens to make it suitable for fitting into the frames; and/or drilling with holes for inserting bridges and temples.
  • a lens holder in which the round lens is placed, and a template holder containing the template with the final shape required of the lens.
  • the flat grinding wheel for rough grinding, the shaped grinding wheel for chamfering the edge, and the drill are mounted on a revolving shaft whose axis of rotation lies in a constant direction.
  • the template holder is brought up against a feeler, which follows the template's profile and, either directly by means of a system of levers, or indirectly by means of electromechanical actuators, guides the movement of the lens holder towards the flat or shaped grinding wheel, or the movement of said grinding wheel towards the lens holder.
  • the first problem stems from the fact that the different types of machine currently available on the market, be they mechanical (which adopt a template and a feeler to shape the lens) or electronic (using an electronic lens-shaping system), all allow for chamfering only on an axis of rotation in a constant direction, so that numerous points on the lens being processed reveal defects due to the imperfect centering of the chamfer.
  • the axis of rotation of the grinding wheel is always parallel to the optical axis, i.e. to the axis connecting the center of curvature of the lens with its focus.
  • modem machines are limited in their ability to create precise shapes, especially when lenses with a marked spherical component are involved.
  • chamfering on an axis that is always parallel to the optical axis prevents a perfect fit of the lens in the frames.
  • the drill also works in a fixed position on its own axis and only allows for the cutting of holes lying parallel to the optical axis.
  • the object of the new machine is to enable chamfering at a variable angle of inclination.
  • Another object is to obtain a chamfer that is perfectly centered and has a constant height around the entire circumference of the lens.
  • Another object is to drill holes at an angle of inclination that is not parallel to the optical axis.
  • Another object is to perform the grinding and polishing of the edge, the chamfering, drilling and any special processing using one and the same machine.
  • Another object is to chamfer the edge of the lens correctly regardless of its shape.
  • Another object is to enable the chamfering of lenses with different curvatures.
  • Another object is to keep the axis of the grinding wheel or milling machine, and of the cutter or drill, parallel to the radius of curvature of the lens at every point around its edge.
  • a further object is to enable the processing of single lenses, or medium-to-small batches of lenses, using models of complex shape and frequently changing the product being processed.
  • Yet another object of the new machine is to be of limited size, so that it can easily be used in an optical laboratory.
  • the new machine for grinding, chamfering and drilling prescription and sunglass lenses featuring a tilting bearing for supporting a revolving shaft for grinding, chamfering and drilling at any chosen angle of inclination.
  • the new machine is fundamentally composed of a revolving shaft on a tilting bearing, fitted at one end with a spindle for holding tools, the inclination of which is governed by a numerical control system, a lens holder for keeping the lens in position and for turning said lens, a circular tool holder capable of turning in steps around its own vertical axis.
  • the revolving shaft enables the rotation and variable inclination of its tool, which may be a flat grinding wheel, a chamfering grinder, or a drill.
  • its tool which may be a flat grinding wheel, a chamfering grinder, or a drill.
  • Each of these tools is presented in turn by the tool holder and then hooked up to said shaft. Said tool change is handled automatically.
  • the grinding, chamfering, drilling and polishing of the lens can be done with the necessary precision and at the required inclination.
  • All the operator has to do is input the data relating to the lenses and the shape of the frames in the computer.
  • this involves specifying parameters such as the lens thickness, the type of chamfer or channel for containing nylon yarn, and the positions of the holes to drill.
  • Said lens is preferably contained in a tray, which is transferred automatically along a rail, picked up automatically by a lens magazine, or placed manually in position for loading into the machine.
  • the lens is picked up automatically and placed in the lens holder, which keeps it in position and induces its rotation.
  • the first step involves bringing said tool spindle up to the magazine containing the tools to enable the required tool to be fitted.
  • the tool spindle After fitting the tool, the tool spindle is moved into a suitable position and the grinding, milling, chamfering, drilling or polishing of the lens takes place, as necessary.
  • the tool spindle is tilted according to the curvature of the lens: this enables the chamfering to be centered and any holes to be drilled parallel not to the optical axis but to the radius of curvature of the lens.
  • Machines can be produced in which the tool spindle can also tilt in a single plane, in addition to moving along the axis x and along the axis z; machines also exist in which said tilting angle can be obtained in two directions.
  • the latter solution is particularly useful for processing prescription lenses.
  • Figure 1 shows the main parts of the new machine.
  • the positioning device (D) receives the lens from a device for collecting the lens, that is not illustrated in the figure. Once the lens is in position, the lens holder (N) makes it rotate. Then a numerical control system guides the movement of the tool spindle (A). The movement of said tool spindle (A) is driven by a system of hinges and worm screws. To be more precise, the tool spindle (A) can move along its own axis z, following the rotation of the worm screw (V1) driven by the motor (M1).
  • the tool spindle (A) is attached to a bearing (S). Said bearing (S) is hinged in (Cs) to a horizontal guide (L).
  • Said bearing (S), supporting the tool spindle (A), is set turning in the plane x-z, on the other hand, by the rotation of the worm screw (V2) driven by the motor (M2).
  • Said worm screw (V2) is hinged at two points, i.e. (C1), which is integral to said bearing (S) supporting the shaft (A), and (C2), which is integral to the guide (L).
  • Said guide (L) is moved along the axis x by the rotation of the worm screw (V3) driven by the motor (M3).
  • Said tool spindle (A) has an end suitable for connecting the tools (U).
  • Figure 1 also shows the tool holder (P), complete with seats for containing the tools (U).
  • Said tool holder (P) is capable of turning in steps around its own vertical axis, so as to bring the tool to use into the right position.
  • said tool spindle (A) moves over the tool holder (P) to fit the required tool. Then, guided by the numerical control system, said tool spindle (A) occupies the different positions required, as the case may be, and is operated in order to perform the processing of the lens.
  • the lens is collected by the device (D) and, by means of other automated devices not illustrated in the figure, it is unloaded and placed in its final packaging.
  • Figure 2 shows a front view of the tool spindle (A) in detail, with the tool (U) fitted therein.
  • the figure shows the worm screw (V1) that moves said tool spindle (A) along the axis z, and the bearing (S) for supporting said tool spindle (A).
  • Said bearing (S) is hinged in (Cs) to the guide (L).
EP05010120A 2004-05-10 2005-05-10 Appareil à angle d'inclinaison variable pour chanfreiner et percer des verres optiques ou des verres de lunettes de soleil Withdrawn EP1595644A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPD20040119 2004-05-10
ITPD20040119 ITPD20040119A1 (it) 2004-05-10 2004-05-10 Macchina per bisellare e forare lenti per occhiali a inclinazione variabile

Publications (1)

Publication Number Publication Date
EP1595644A1 true EP1595644A1 (fr) 2005-11-16

Family

ID=34936332

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05010120A Withdrawn EP1595644A1 (fr) 2004-05-10 2005-05-10 Appareil à angle d'inclinaison variable pour chanfreiner et percer des verres optiques ou des verres de lunettes de soleil

Country Status (2)

Country Link
EP (1) EP1595644A1 (fr)
IT (1) ITPD20040119A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104440359A (zh) * 2014-10-31 2015-03-25 濠玮精密科技（深圳）有限公司 一种自动钻孔倒角机
US10537944B2 (en) 2015-02-27 2020-01-21 Optotech Optikmaschinen Gmbh Milling device for optical lens production with two milling stations and method of use

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4646422A (en) * 1982-03-10 1987-03-03 Renishaw Plc Machine tool
EP0937542A1 (fr) * 1998-02-23 1999-08-25 Schneider GmbH + Co. KG Procédé pour polir des lentilles et dispositif de polissage avec plusieurs mandrins et outils pour mettre en oeuvre ce procédé
EP1310326A1 (fr) * 2001-11-08 2003-05-14 Nidek Co., Ltd. Dispositif d'usinage de verre de lunettes
US20040033768A1 (en) * 2000-06-26 2004-02-19 Joachim Diehl Device for loading and unloading optical workpieces

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4646422A (en) * 1982-03-10 1987-03-03 Renishaw Plc Machine tool
EP0937542A1 (fr) * 1998-02-23 1999-08-25 Schneider GmbH + Co. KG Procédé pour polir des lentilles et dispositif de polissage avec plusieurs mandrins et outils pour mettre en oeuvre ce procédé
US20040033768A1 (en) * 2000-06-26 2004-02-19 Joachim Diehl Device for loading and unloading optical workpieces
EP1310326A1 (fr) * 2001-11-08 2003-05-14 Nidek Co., Ltd. Dispositif d'usinage de verre de lunettes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104440359A (zh) * 2014-10-31 2015-03-25 濠玮精密科技（深圳）有限公司 一种自动钻孔倒角机
CN104440359B (zh) * 2014-10-31 2015-11-18 濠玮精密科技（深圳）有限公司 一种自动钻孔倒角机
US10537944B2 (en) 2015-02-27 2020-01-21 Optotech Optikmaschinen Gmbh Milling device for optical lens production with two milling stations and method of use

Also Published As

Publication number Publication date
ITPD20040119A1 (it) 2004-08-10

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