EP0176460B1 - Machine pour générer des surfaces sphériques ou toriques, concaves ou convexes sur des verres optiques - Google Patents

Machine pour générer des surfaces sphériques ou toriques, concaves ou convexes sur des verres optiques Download PDF

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Publication number
EP0176460B1
EP0176460B1 EP19850430029 EP85430029A EP0176460B1 EP 0176460 B1 EP0176460 B1 EP 0176460B1 EP 19850430029 EP19850430029 EP 19850430029 EP 85430029 A EP85430029 A EP 85430029A EP 0176460 B1 EP0176460 B1 EP 0176460B1
Authority
EP
European Patent Office
Prior art keywords
glass
slide
spindle
machine according
wheel
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.)
Expired
Application number
EP19850430029
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0176460A1 (fr
Inventor
Maurice Otto
Jean-Pierre Peridont
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.)
Etudes et Fabrications Optiques SA
Original Assignee
Etudes et Fabrications Optiques SA
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 Etudes et Fabrications Optiques SA filed Critical Etudes et Fabrications Optiques SA
Publication of EP0176460A1 publication Critical patent/EP0176460A1/fr
Application granted granted Critical
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Expired legal-status Critical Current

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    • 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
    • B24B13/04—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses involving grinding wheels controlled by gearing
    • B24B13/043—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses involving grinding wheels controlled by gearing using cup-type grinding wheels

Definitions

  • the present invention relates to a machine for generating spherical or toric, concave or convex surfaces on optical glasses.
  • the technical sector of the invention is that of the industry for manufacturing optical glasses.
  • the machines known for manufacturing optical glasses comprise a glass holder spindle mounted fixed in position and a grinding wheel rotatably mounted about its longitudinal axis, which grinding wheel is carried by a horizontally pivoting assembly.
  • This set includes all the measurement bodies and is therefore quite large and correspondingly relatively heavy.
  • the objective of the present invention is to provide a machine for generating spherical or toric, concave or convex surfaces of a new design, less expensive to produce and of a lighter structure than the machines currently on the market. Also, a machine allowing greater flexibility of use both at the level of taking measurements and at that of its operation, for the operations of surfacing optical glasses.
  • the result of the invention is a machine called "prescription generator of a new design, great operating flexibility and greater precision.
  • Such a machine also offers, compared to known machines, a gain in bulk, the machine according to the invention being less bulky, a gain in capacity by extension of the slides or by lengthening of the latter to allow the generation of very large curves. rays.
  • FIGS. 1 to 3 of the drawing Reference is first made to FIGS. 1 to 3 of the drawing.
  • a machine consists of a frame 1, which comprises, at its lower part, a bodywork 2 delimiting an enclosure into which one can access by three 3/4/4 'doors.
  • the lower part of the enclosure which is accessed through door 4 comprises a soluble oil tank and a pump (not shown) for bringing the oil and spraying it on the glasses during their surfacing.
  • the soluble oil is collected in a receiving hopper 5, which comprises a return pipe 6 from the oil to said tank.
  • This hopper 5 is located at the upper part of the bodywork, the enclosure of which is accessed by the door 4 'contains inter alia an electric motor 7.
  • the machine At the upper part of the frame 1 and above said bodywork, the machine comprises a grinding wheel 8, which is rotated about its longitudinal axis which extends horizontally.
  • This wheel is mounted in a support fixed to the frame 1 and is rotated by the motor 7 via a set of pulleys 7a / 8a and a belt 9, for example of a trapezoidal cross section.
  • the grinding wheel 8 is diamond-coated and of a type commonly used on such machines.
  • the machine further comprises a pivoting support 10, articulated to the frame 1 and below the grinding wheel 8, which support carries at one of its ends a base 11 mounted rotating on said support and in which base is mounted a spindle- glass holder 12, the longitudinal axis of which is located in the same plane in which the longitudinal axis of the grinding wheel 8 is situated.
  • the support 10 (fig. 4) is pivotally mounted about a vertical axis 10a, which is fixed to the frame 1 and comprises a parallelepipedic body 10b.
  • the axis 10a passes through said body and is mounted in two roller bearings 10c / 10d situated at the level of the lower and upper faces of the body 10b.
  • This comprises two cylindrical conduits 10e in which just slide two support bars 10f.
  • Said bars 10f are spaced from each other by a few centimeters and their longitudinal axes are located in the same horizontal plane.
  • Said bars 10f are embedded in an end block 10g and are surrounded by dust protection bellows 10h. Leur'course is delimited by 10j stop rings.
  • the base 11 is mounted for horizontal rotation ment in the block 10g, by being fixed to an axis 11a carried by two roller bearings 11b / 11c mounted in housings reserved in said block 10g, the assembly being blocked by a nut 11a, screwed around a threaded end piece lla z .
  • the base 11 comprises a bore 11d in which the glass holder pin 12 is slidably mounted, which is parallel to said bars 10f of the support 10.
  • Said pin 12 comprises, at its front part, the glass holder 12a and at its rear part of a jack 13.
  • the spindle body 12 takes the form of a cylindrical tubular sheath in which the movable rod of the jack 13 is slidably mounted, which comprises, at its rear part, a piston 13b which moves in a chamber 13c.
  • the rod 13a slides on two bronze rings 14 arranged at the ends of the sheath 12.
  • the piston 13b comprises a guide finger 15 constituted by a threaded ring 15a, into which a screw 15b is screwed, the head of which is embedded in the piston 13b, which finger is perpendicular to the faces of the piston and cooperates with a cylindrical housing 16a, reserved in a flange 16 to which the body of the jack 13 is fixed.
  • the finger 15 has the function of allowing the translation of the piston rod 13 in the direction of its longitudinal axis, while preventing it from rotating around said axis.
  • Said flange 16 comprises, opposite the cylinder 13, a tapped cylindrical extension 16b adopting the shape of a sleeve and into which one of its ends screws the tubular body of the glass holder spindle 12.
  • a split ring 17 Around said extension , in the form of a sleeve 16b, is placed a split ring 17, which encloses said sleeve 16b, which is tightened by two screws 17a and which comprises, opposite its split part, a cylindrical hole extending parallel to the rod piston and spindle body 12 and through which passed a screw 18 whose head is embedded in the ring 17.
  • This screw is screwed into a tapped hole reserved in a guide rod, for example cylindrical 19 which slides in a conduit cylindrical 11e which crosses the base 11 lengthwise.
  • This guide rod 19 has the function of authorizing the displacement in translation of the spindle-glass holder 12 / jack 13 assembly while preventing it from rotating around its longitudinal axis.
  • the cylinder body 13 has at its center a threaded nut 20, which is fixed to the cylinder by means of four screws 21.
  • a threaded rod 22 ending opposite the cylinder 13 by a piece of cylindrical shaft 22a, which is guided in rotation by a ball bearing 23, mounted at the end of a tubular body 24, of square section, coaxial with the cylinder rod and the threaded rod and connected to the base 11.
  • the body tubular 24 has, at its end, a thick wall 24a in which is reserved a cylindrical housing in which is housed said ball bearing 23.
  • the jack rod 13a has, in its center, a cylindrical hole 13a, into which the threaded rod 22 penetrates during the movement of said assembly 12/13.
  • the jack 13 is for example pneumatically operated and the air is admitted into the chamber 13c by a duct 13d in which a connector 28 is fixed, the air tubing not being shown.
  • the tubular spindle 12 has, at its front end, a cylindrical sheath 12a, which is of a larger diameter than the spindle 12.
  • a cylindrical head 29 which is fixed to the rod of the jack 13a by means of a screw 30, the head of which is embedded in the cylindrical part 29.
  • the cylindrical head 29 comprises at its periphery cylindrical housings 29a in which claws 31 are mounted, for example three in number and arranged at 120 ° from one another, also called "dog". These claws comprise at one of their ends, a cylindrical part 31a which is engaged in said cylindrical housings 29a of the head. Said claws 31 are supported in a groove of a circular section 12b reserved for the internal periphery of the cylindrical sheath 12a. Under the effect of the jack 13, the rod 13a is moved in the direction of the arrow F, the latter drives in its stroke the cylindrical head 29 which causes the claws 31 to tilt in the direction of the arrow F, to ensure the gripping of the optical glass 32.
  • the latter in known manner is fixed by means of a metal having a very low melting point to a metallic cylindrical token 33.
  • the claws 31 are brought into contact with said token. This comprises two centering holes equidistant from the center of the token and into which two points 34 carried by the cylindrical head 29 penetrate, which points are pushed outside the head by springs 35.
  • the base 11 in which the glass holder spindle 12 is mounted has, at its upper part, a blocking wedge 36, in which a slide 37 is mounted.
  • the wedge 36 is made in two parts 36a / 36b and forms a sort dovetail-shaped jaw to block the slide 37 by means of two clamping screws.
  • the slide 37 is of a cross section whose upper part 37a is rectangular and the lower part 37b is in the form of a dovetail and the blocking is carried out on this part.
  • the slide 37 is thus parallel to the longitudinal axis of the spindle-glass holder 12 / jack 13 assembly.
  • Said slide cooperates by its part of rectangular section 37a with a slide 38 produced in two parts hinged together 38, / 38 2 , around an axis of rotation 39.
  • Said axis 39 is fixed to part 38 2 of the slide and is engaged, by its free end, in a roller bearing 40 placed in a cylindrical housing 38, a of the part 38,.
  • the slide 38 2 constitutes a jaw and is composed of two parts 38 2 a and 38 2 b which enclose the rectangular section part 37a of the slide 37.
  • the tightening of said parts 38 2 a / 38 2 b on the slide 37 is obtained by two jacks 41 which are distributed over the length of the slide.
  • Each of these jacks comprises a body 41a comprising several chambers, for example three in number 41b / 41c / 41d, in which a piston 41e / 41f / 41g moves, which are fixed to an axis 41 h which passes through the body of the jack and also part 38 2 a of part 38 2 of the slide.
  • the axes 41 h of the cylinders 41 are threaded at their ends and are screwed into tapped holes 38 2 c reserved in the part 38 2 b of the slide.
  • the rod 41h of the cylinders comprises a main conduit 41j extending on the longitudinal axis of the rod and secondary conduits 41k for diffusing the working fluid in the chambers 41b / 41c / 41d, for example said cylinders are pneumatically operated and l air is supplied by pipes connected to the cylinders by fittings 42.
  • compressed air is admitted into the first chamber 41 b by a tube connected by fittings 43.
  • the design of these jacks makes it possible to communicate to the jaw the clamping force necessary to immobilize the slide 38 on the slide 37.
  • the slide 38 consists of two parts 38, a / 38, b which form a jaw to enclose another slide 44, which is of a cross section having the general shape of a double dovetail 44a / 44b.
  • the jaw 38, a / 38, b encloses the dovetail 44b and has the purpose of making up for the play existing between the slide and the slide, which is necessary to allow the slide to move.
  • the jaw 38 1 a / 38, b is actuated when the machine is operational.
  • the operation of this play take-up device is obtained by a jack 45 in all points identical to the jacks 41 which actuate the locking of the part 38 2 of the slide on the slide 37.
  • the part 38 of the slide comprises a threaded nut 46, into which a threaded rod 47 is screwed which extends over the entire length of the slide 44 and which is fixed to a flywheel 48 with crank 48a, mounted with free rotation at one end of the slide 44 in a bearing 44 "the other end of the threaded rod 47 is mounted in another bearing 442, fixed to the end of the slide opposite to that which includes the flywheel 48.
  • the rod 47 is arranged in a longitudinal groove 44c of the slide and has two shaft ends at its ends and the flywheel 48 is keyed to one of them by means of a disc key 49.
  • the slide 44 is fixed in an adjustable manner to a slide 50, which comprises a male dovetail part 50a which cooperates with a female dovetail 51a reserved in a horizontal arm 51, which extends in door-to- false from the frame 1 and whose free end is located above the grinding wheel 8 and the pivoting carriage 10.
  • This arm 51 is perpendicular to the axis of the grinding wheel 8.
  • the slide 44 is mounted, by its part 44a, in a dovetail rebate 50b and is locked in position by a blocking wedge 52, fixed by two screws 53, screwed in the slide, which wedge 52 is engaged in an oblique groove 44d, reserved in the slide 44
  • This groove 44d extends over the length of the slide, which comprises, on its edge located next to said groove, a graduated rule 54 in front of which moves an index 55 fixed to the slide 38 1 .
  • Said slide 50 has, at its upper part, a cavity 50c, in which is placed a rack 56 which extends in the longitudinal direction of the slide and which is fixed thereto by means of three screws 57.
  • the rack 56 cooperates with a pinion 58 located at the end of a shaft 59 and integral with the latter.
  • Said shaft 59 extends orthogonally to the arm 51 and to the slide 50 and is mounted in two ball bearings 60/61 mounted in a centering sleeve 62, fixed to said arm 51.
  • the shaft 59 comprises a tangent wheel 63, which is keyed onto said shaft and is held in translation by a nut 64.
  • the tangent wheel 63 is disposed in a housing 65a, reserved in a support 65 fixed to the arm 51.
  • the support 65 comprises a sleeve 65b, which is perpendicular to the arm 51 and parallel to the slide 44.
  • this sleeve 65b is disposed an axis 66, mounted for rotation around two ball bearings 67/68, which axis 66 has at one end an endless screw 69 which cooperates with the tangent wheel 63.
  • Said axis 66 is fixed at its other end to a flywheel 70 with a crank 70a, which flywheel is keyed on axis 66.
  • a pinion 71 On this axis is also keyed a pinion 71 whose teeth cooperate with that of another pinion 72, rotatably mounted on two ball bearings 73, carried by an axis 74 embedded in a flange 65b, which ends the sleeve 65b.
  • the pinion 72 is associated with another pinion 75 of smaller nominal diameter, which cooperates with a crown with internal teeth 76, fixed to a vernier 77 which moves in front of an index (not shown) fixed to said flange 65b i .
  • the glass holder spindle 12 includes a protection 78 to protect the operator from splashes of soluble oil when surfacing optical glasses.
  • the glass 32 secured to the metal token 33, is placed in the glass holder 12a.
  • the jack 13 is actuated and by clamping the claws 31, the glass is held by the pin 12.
  • the radius of curvature to achieve when it is a spherical surface or the two radii of. curvature when it is a toric surface are adjusted as follows depending on whether it is a concave glass or a convex glass.
  • the radius of curvature of the surface glass is represented by the distance between the front face of the grinding wheel 8 materialized by the line P and the axis 39 (fig. 1).
  • the axis 39 is positioned as shown in Figure 1 to the left of the line P.
  • said axis 39 is positioned to the right of the line P (fig. 1). The values are read on the graduated rule 54.
  • the axis 39 is positioned in a vertical plane passing through the longitudinal axis of the grinding wheel 8, the glass holder spindle 12 being, in its neutral position, in the extension of the grinding wheel 8. This maneuver is carried out by operating the steering wheel 70.
  • the radius measurement is carried out by pressurizing the cylinders 41/45 and by moving the slider 38 by actuating the handwheel 48.
  • the glass holder spindle 12 is moved to the side of the grinding wheel 8 and the glass 32 is brought into contact with the grinding wheel.
  • the rapid translation of the spindle 12 is allowed thanks to the design of the support 10.
  • the slide 38 is immobilized on its slides 37/44.
  • the generation of the surface is obtained by the horizontal pivoting around the axis 10a of the glass holder spindle 12, which pivoting is carried out manually.
  • the flywheel 27 is operated to machine the glass in successive passes.
  • the machining finished, the two jacks 41 are pressurized, the rapid removal of the glass 32 from the grinding wheel 8 is carried out and the glass is recovered after having put the jack 13 depressurized.
  • the larger of the two radii of curvature is determined as has just been described for the radius of a spherical surface.
  • the smallest radius is represented by the misalignment of the axis of rotation 39 with respect to the longitudinal axis of the grinding wheel 8 (see Figure 3).
  • the adjustment and the measurement are obtained by operating the handwheel 70, the value of the small radius is read on the vernier 77.
  • the surfaces of the glasses are made as described above.
  • the machining finished, the cylinders 41 and 13 are depressurized and the glass recovered.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
EP19850430029 1984-09-14 1985-09-05 Machine pour générer des surfaces sphériques ou toriques, concaves ou convexes sur des verres optiques Expired EP0176460B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8414235A FR2570312B1 (fr) 1984-09-14 1984-09-14 Machine pour generer des surfaces spheriques ou toriques, concaves ou convexes sur des verres optiques
FR8414235 1984-09-14

Publications (2)

Publication Number Publication Date
EP0176460A1 EP0176460A1 (fr) 1986-04-02
EP0176460B1 true EP0176460B1 (fr) 1988-05-04

Family

ID=9307789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850430029 Expired EP0176460B1 (fr) 1984-09-14 1985-09-05 Machine pour générer des surfaces sphériques ou toriques, concaves ou convexes sur des verres optiques

Country Status (4)

Country Link
EP (1) EP0176460B1 (es)
DE (1) DE3562465D1 (es)
ES (1) ES8701002A1 (es)
FR (1) FR2570312B1 (es)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1445522A (fr) * 1965-04-07 1966-07-15 Optique Telegic Soc D Machine pour l'usinage de surfaces, notamment sphériques ou toriques
US3399496A (en) * 1965-05-12 1968-09-03 Textron Inc Machine for generating toric surfaces
US3492764A (en) * 1967-03-28 1970-02-03 American Optical Corp Lens generating method
US3624969A (en) * 1970-07-15 1971-12-07 American Optical Corp Lens generating apparatus
US3790875A (en) * 1970-11-27 1974-02-05 Autoflow Eng Ltd Digital to analogue converter
JP5663231B2 (ja) * 2009-08-07 2015-02-04 株式会社半導体エネルギー研究所 発光装置

Also Published As

Publication number Publication date
ES8701002A1 (es) 1986-12-01
FR2570312A1 (fr) 1986-03-21
FR2570312B1 (fr) 1988-05-27
ES546843A0 (es) 1986-12-01
DE3562465D1 (en) 1988-06-09
EP0176460A1 (fr) 1986-04-02

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