EP0270117A2 - Schnellwechselwerkzeug für Linsen - Google Patents

Schnellwechselwerkzeug für Linsen Download PDF

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Publication number
EP0270117A2
EP0270117A2 EP87117908A EP87117908A EP0270117A2 EP 0270117 A2 EP0270117 A2 EP 0270117A2 EP 87117908 A EP87117908 A EP 87117908A EP 87117908 A EP87117908 A EP 87117908A EP 0270117 A2 EP0270117 A2 EP 0270117A2
Authority
EP
European Patent Office
Prior art keywords
shaft
tool
shank
axis
lens
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Withdrawn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
EP87117908A
Other languages
English (en)
French (fr)
Other versions
EP0270117A3 (de
Inventor
Roy Gray
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.)
Gerber Coburn Optical Inc
Original Assignee
Coburn Optical Industries Inc
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 Coburn Optical Industries Inc filed Critical Coburn Optical Industries Inc
Publication of EP0270117A2 publication Critical patent/EP0270117A2/de
Publication of EP0270117A3 publication Critical patent/EP0270117A3/de
Withdrawn legal-status Critical Current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
    • 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
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/01—Specific tools, e.g. bowl-like; Production, dressing or fastening of these tools
    • 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
    • B24B45/00—Means for securing grinding wheels on rotary arbors

Definitions

  • the present invention relates generally to the generating of opthalmic lenses from lens blanks made of polymeric material or of glass.
  • the present invention is an improvement in the conventional technique in which a lens blank is mounted in an appropriate means on a machine, and a rapidly rotating lens grinding tool is applied to the surface of the lens blank in a precisely determined manner in order to generate on the lens blank the desired surface.
  • the lens grinding tool comprises a metallic cup-shaped object whose rim is encrusted with hard abrasive material such as diamond grit, carbide, or the like.
  • the grinding tool is rotated very rapidly by an electric motor, and is attached to the motor by means of a conical region of the tool which extends from the convex surface of the tool along the axis of the tool, in a manner such that the region is widest where it is attached to the convex surface of the tool and progressively tapers to a narrower width with increasing distance from that convex surface.
  • the present invention comprises apparatus for generating a surface on a lens blank, comprising
  • Another aspect of the present invention comprises a machine for generating a lens surface included the afore­ mentioned apparatus in combination with means for holding a lens blank, means for moving said lens blank and said lens grinding tool means with respect to each other for lens generating engagement, and motor means for rotating said shaft means.
  • the present invention further comprises the afore­mentioned apparatus in combination with additional means, mountable on the shank of the lens grinding tool means, for respective engagement with the contact surfaces on said shank and said shaft.
  • the preferred aspect of the present invention comprises any of the aforementioned apparatus in combination with shim means for precisely varying the location of the lens grinding tool means with respect to the shaft means.
  • the present invention is adaptable with lens grinding machines having the conventional stations for mounting a lens blank and for mounting a lens grinding tool which is secured to a shaft that can be rotated at high speed by a suitable motor.
  • lens grinding machines having the conventional stations for mounting a lens blank and for mounting a lens grinding tool which is secured to a shaft that can be rotated at high speed by a suitable motor.
  • One suitable example is shown in Figure 1, although other embodiments will readily come to mind.
  • numeral 1 denotes generally the grinding tool station. It includes cup-shaped grinding tool 2 secured to shaft 3 at the first end of shaft 3, in a manner which will be described in greater detail below.
  • Shaft 3 extends through housing 4 and is supported for rotation within housing 4 by appropriate bearings.
  • Pulley 5 secured near the second end of shaft 3 is connected via belt 6 to pulley 7 which is secured to the rotor of motor 8.
  • Shaft 3 can alternatively itself be the rotor of motor 8. Housing 4 and motor 8 do not themselves rotate about the axis of rotation of shaft 3, but can be moved in other planes.
  • the position of the unit comprising housing 4, motor 8 and shaft 3, can be pivoted about a vertical axis perpendicular to the axis of rotation of shaft 3, and can be moved toward and away from lens mounting station 11 in a direction parallel to the axis of rotation of shaft 3.
  • Such movement can be carried out manually, by electro-mechanical control, or by computer control.
  • Such controls are well-known in the art.
  • reference numeral 11 denotes generally the lens mounting station.
  • a lens blank 12 of glass or polymeric material (such as polymerized diethylene glycol bis (allyl carbonate)) is mounted on lens block 13 by any known means, such as with a waxy adhesive, so as to be immobile during the grinding operation but removable subsequently.
  • Lens block 13 is in turn attached, removably but in a fixed position, to mandrel 14, for instance by mechanical coupling.
  • lens grinding tool 2 is rotated about its axis by means of shaft 3 and motor 8, and the grinding surfaces of tool 2 trace a carefully controlled path across the surface of lens blank 12 to produce a surface having the desired geometric configuration.
  • the ground lens blank can then be finely polished, to provide a finished ophthalmic surface, and the same operations can be carried out on the other side of the blank to provide a finished lens.
  • Apparatus for moving the tool 2 across lens blank 12 so as to generate a desired ophthalmic surface on lens blank 12 is well-known to those acquainted in this art; one example is shown in U.S. Patent No. 2,806,327.
  • Figure 2 depicts a lens grinding tool 2 useful in the present invention. It has a cup-shaped configuration including a cylindrical rim portion 16 having an arcuate end surface 17. Tool 2 also comprises spaced notches 18. Cylindrical shank 32 extends axially from the convex side of tool 2. Shank 32 includes shoulder 34 which defines a planar contact surface perpendicular to the axis of rotation of tool 2. Grit plating is conveniently provided on the inside and outside of surface 16, and on surface 17. Such a tool can readily be manufactured by any of several suppliers to firms that make and use lens generating machines.
  • lens grinding station 2 includes shaft 3 which is mounted for rotation in housing 4 by appropriate bearing means 20 including races 21 and ball bearings 22. End caps 23 provided with suitable bushings 24 seal the ends of housing 24 through which the ends of shaft 3 extend. Shaft 3 terminates with a contact surface 26 at its first end. Shaft 3 includes an axial bore 28 therethrough.
  • Cutting tool 2 is provided with integral cylindrical shank 32 which extends coaxially with respect to the axes of rotation of tool 2 and of shaft 3.
  • Shank 32 also has shoulder 34 which lies in a plane perpendicular to the axis of rotation of tool 2.
  • Shank 32 preferably is dimensioned so that an end portion thereof extends into the axial bore 28.
  • Bolt 36 in bore 28 is threaded at its first end 38 to mate with a corresponding axial threaded hole 40 in shank 32.
  • Bolt 36 also has stop means for engaging the second end when the tool 2 and bolt 36 are threaded together tightly so as to secure tool 2 with respect to shaft 3 (by “secure” is meant that tool 2 and shaft 3 necessarily rotate together and tool 2 and bolt 36 cannot move axially with respect to the housing 4).
  • Stop means can comprise a head 39 on bolt 36 wider than the axial bore 28.
  • the position of tool 2 (or, more practically, of grinding surface 17) with respect to the shaft 3 can be fixed precisely with the aid of a set of shims, which are preferably flat and circular having an outside diameter approximately equal to that of shoulder 34 and having a central hole whose diameter is slightly greater than that of shank 32.
  • An appropriate set of shims would have a variety of thicknesses, as follows: 0.002 inch; 0.004 inch; 0.008 inch; 0.010 inch; 0.020 inch; 0.040 inch; 0.080 inch; two of 0.100 inch each; and 0.200 inch. Other combinations of thicknesses are of course possible.
  • Those shims are capable of adjusting the axial position of grinding surface 17 with respect to housing 4 and shaft 3 by up to 0.500 inch, plus or minus 0.001 inch.
  • the desired distance preferably to the nearest thousandth of an inch
  • the fixed reference point would be corner A on shaft 3.
  • This distance is a function of the desired distance between the shaft and a lens blank mounted as shown generally in Figure 1. It may not be necessary to measure this distance more than once on a given machine.
  • the axial distance is measured from the grinding surface 17 on the fresh grinding tool to a reference point on the tool, which should be point B on shoulder 34.
  • This distance can be expected to vary by some thousandths of an inch from one tool to the next.
  • the difference between the two distances thus measured is made up by a shim or an appropriate combination of shims which are placed on the shank 32.
  • the fresh tool 2, with shims as necessary to make up the desired distance difference, is then secured to shaft 3 by inserting shank 32 into the first end of shaft 3, and tightening bolt 36 into hold 40 until tool 2 is secured to shaft 3.
  • FIG. 4 An alternative, preferred embodiment of the invention is shown in cross-section in Figure 4.
  • Shaft 3 is mounted in housing 4 as described above, and supported by bearings 22.
  • the second end of shaft 3, not shown in Figure 4, is the same as Figure 3.
  • the first end of shaft 3, which can include a vertical face as described above also comprises an angled portion 42.
  • Tapered shim collar 44 adapted to fit around shank 32 has first face 45 which is parrallel to the face of shoulder 34, and second face 46 which forms an angle with respect to the axis of rotation of tool 2.
  • a double-­tapered ring 48 is adapted to fit relatively tightly onto shank 32. Ring 48 has one tapered portion 49 whose angle with respect to the axis of rotation matches that of angled portion 42 in shaft 3.
  • Ring 48 has second tapered portion 50 whose angle to the axis matches that of angles portion 46 on shim collar 44.
  • Ring 48 preferably has a longitudinal slit extending the entire length thereof, so that when tool 2 is tightened onto shaft 3 as described herein the action of collar 44 forcing ring 48 against angled surface 42 forces ring 48 to grip shank 32 ever more tightly.
  • the combination of collar 44 and ring 48 comprise a means for enhancing the immobilization of tool 2 onto shaft 3.
  • a fresh grinding tool 2 is secured to the shaft 3 in essentially the same manner as described above.
  • the distances from grinding surface 17 to points A and B, respectively, are determined, and the difference is calculated.
  • the shims necessary to make up that difference taking into account the axial dimentions of shim collar 44 and ring 48, are placed over shank 32, followed by collar 44 and ring 48, and the shank is tightened onto bolt 36 as described above.
  • kits useful in adapting lens grinding machines already having a shaft with an axial bore and a vertical or inwardly tapered contact surface comprises the lens grinding tool described hereinabove, provided with a cylindrical shank (which is preferably capable of fitting within the first end of the shaft), and having a perpendicular radial shoulder as described herein, in combination with the shims described herein, and preferably also with the shim collar and a double-tapered ring whose tapered surfaces match with the tapered surface of the shim collar, and the tapered contact surface of the shaft, respectively.
  • the present invention provides the advantage of easy and rapid replacement of grinding tool 2. Replacement requires only loosening and subsequent retightening of bolt 36, without the need to deal with a bolt head or nut located inside the concave portion of tool 2. Also, as described above, the position of a given grinding tool can be adjusted very quickly. The axial distance from grinding surface 17 to point B can be measured at any time prior to actual attachment of the tool to shaft 3, so that when the time comes to replace a worn tool it is not necessary to consume extra down-time measuring and calibrating the new tool. One simply slips the necessary shims onto the shank of the tool and attaches the tool to the shaft.

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)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
EP87117908A 1986-12-03 1987-12-03 Schnellwechselwerkzeug für Linsen Withdrawn EP0270117A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US93725186A 1986-12-03 1986-12-03
US937251 1986-12-03

Publications (2)

Publication Number Publication Date
EP0270117A2 true EP0270117A2 (de) 1988-06-08
EP0270117A3 EP0270117A3 (de) 1989-06-28

Family

ID=25469685

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87117908A Withdrawn EP0270117A3 (de) 1986-12-03 1987-12-03 Schnellwechselwerkzeug für Linsen

Country Status (6)

Country Link
EP (1) EP0270117A3 (de)
JP (1) JPS63162149A (de)
KR (1) KR880007173A (de)
BR (1) BR8706539A (de)
CA (1) CA1307400C (de)
ZA (1) ZA879084B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0509481A2 (de) * 1991-04-15 1992-10-21 Donald J. Acheson Glaskantensäummaschine
WO1996006709A1 (de) * 1994-08-29 1996-03-07 Fritz Werner & Niles Werkzeugenmaschinen Ag Werkzeugträger an einer werkzeugmaschine
WO1997018918A1 (en) * 1995-11-21 1997-05-29 Micro Optics Design Corporation Apparatus for cutting a workpiece and including a kinematic tool coupling

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2455597A (en) * 1945-12-07 1948-12-07 Super Cut Grinding wheel
US2643492A (en) * 1950-12-05 1953-06-30 Burroughs Optomat Inc Grinding machine and method
GB1454248A (de) * 1974-06-20 1976-11-03 Essilor Int
GB2073065A (en) * 1980-04-03 1981-10-14 Wylde Ltd J & S Minus-curve toric lens generator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2455597A (en) * 1945-12-07 1948-12-07 Super Cut Grinding wheel
US2643492A (en) * 1950-12-05 1953-06-30 Burroughs Optomat Inc Grinding machine and method
GB1454248A (de) * 1974-06-20 1976-11-03 Essilor Int
GB2073065A (en) * 1980-04-03 1981-10-14 Wylde Ltd J & S Minus-curve toric lens generator

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0509481A2 (de) * 1991-04-15 1992-10-21 Donald J. Acheson Glaskantensäummaschine
EP0509481A3 (en) * 1991-04-15 1992-12-16 Donald J. Acheson Glass beveling machine
WO1996006709A1 (de) * 1994-08-29 1996-03-07 Fritz Werner & Niles Werkzeugenmaschinen Ag Werkzeugträger an einer werkzeugmaschine
WO1997018918A1 (en) * 1995-11-21 1997-05-29 Micro Optics Design Corporation Apparatus for cutting a workpiece and including a kinematic tool coupling
AU703081B2 (en) * 1995-11-21 1999-03-18 Micro Optics Design Corporation Apparatus for cutting a workpiece and including a kinematic tool coupling

Also Published As

Publication number Publication date
JPS63162149A (ja) 1988-07-05
CA1307400C (en) 1992-09-15
BR8706539A (pt) 1988-07-12
KR880007173A (ko) 1988-08-26
ZA879084B (en) 1988-06-01
EP0270117A3 (de) 1989-06-28

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Inventor name: GRAY, ROY