CA2036590C - Lathe for generating asperical surface on work pieces - Google Patents
Lathe for generating asperical surface on work piecesInfo
- Publication number
- CA2036590C CA2036590C CA 2036590 CA2036590A CA2036590C CA 2036590 C CA2036590 C CA 2036590C CA 2036590 CA2036590 CA 2036590 CA 2036590 A CA2036590 A CA 2036590A CA 2036590 C CA2036590 C CA 2036590C
- Authority
- CA
- Canada
- Prior art keywords
- cam
- cam follower
- axis
- assembly
- spindle
- 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 - Lifetime
Links
- 238000005520 cutting process Methods 0.000 claims abstract description 9
- 230000020347 spindle assembly Effects 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 150000002500 ions Chemical class 0.000 description 17
- 241001435619 Lile Species 0.000 description 11
- 230000003287 optical effect Effects 0.000 description 5
- 241000973252 Diagramma Species 0.000 description 3
- BGLAMXJBTZOWLK-UHFFFAOYSA-N 3-[[4-acetyl-2,3,6-trihydroxy-5-(3-methylbut-2-enyl)phenyl]methyl]-4-hydroxy-5,6-dimethylpyran-2-one Chemical compound OC1=C(C(C)=O)C(CC=C(C)C)=C(O)C(CC=2C(OC(C)=C(C)C=2O)=O)=C1O BGLAMXJBTZOWLK-UHFFFAOYSA-N 0.000 description 2
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 2
- BSYNRYMUTXBXSQ-UHFFFAOYSA-N Aspirin Chemical compound CC(=O)OC1=CC=CC=C1C(O)=O BSYNRYMUTXBXSQ-UHFFFAOYSA-N 0.000 description 1
- 101100477591 Bacillus licheniformis sinR gene Proteins 0.000 description 1
- KUVIULQEHSCUHY-XYWKZLDCSA-N Beclometasone Chemical compound C1CC2=CC(=O)C=C[C@]2(C)[C@]2(Cl)[C@@H]1[C@@H]1C[C@H](C)[C@@](C(=O)COC(=O)CC)(OC(=O)CC)[C@@]1(C)C[C@@H]2O KUVIULQEHSCUHY-XYWKZLDCSA-N 0.000 description 1
- 208000037656 Respiratory Sounds Diseases 0.000 description 1
- 241001130469 Tila Species 0.000 description 1
- 230000002079 cooperative effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 101150110087 flgG gene Proteins 0.000 description 1
- BALXUFOVQVENIU-KXNXZCPBSA-N pseudoephedrine hydrochloride Chemical compound [H+].[Cl-].CN[C@@H](C)[C@@H](O)C1=CC=CC=C1 BALXUFOVQVENIU-KXNXZCPBSA-N 0.000 description 1
- 206010037833 rales Diseases 0.000 description 1
- 101150008563 spir gene Proteins 0.000 description 1
Landscapes
- Eyeglasses (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
- Turning (AREA)
Abstract
TITLE: LATHE FOR GENERATING ASPHERICAL SURFACES ON WORK PIECES
ABSTRACT OF THE DISCLOSURE
A lathe is provided for generating surfaces on work pieces and which includes a spindle for support of a work piece while it is revolved and against which a cutting tool is caused to traverse. A
tool supporting turret assembly is provided to hold the cutting tool and effect its movement over a path under control of a cam assembly that includes a roller cam having a cylindrical surface. The turret assembly includes a cam follower having a V-shaped configuration which is caused to bear against the roller cam and to move with respect to the cam roller in a manner to result in forming of a surface on the work piece that is of a predetermined configuration through cooperative relative movement in the orientation of the cam follower with respect to the roller.
ABSTRACT OF THE DISCLOSURE
A lathe is provided for generating surfaces on work pieces and which includes a spindle for support of a work piece while it is revolved and against which a cutting tool is caused to traverse. A
tool supporting turret assembly is provided to hold the cutting tool and effect its movement over a path under control of a cam assembly that includes a roller cam having a cylindrical surface. The turret assembly includes a cam follower having a V-shaped configuration which is caused to bear against the roller cam and to move with respect to the cam roller in a manner to result in forming of a surface on the work piece that is of a predetermined configuration through cooperative relative movement in the orientation of the cam follower with respect to the roller.
Description
2~ ~ 9 ~ TITLE: LATHE FOR GENERATING ASPHERICAL SURFACES ON WORK PIECES
,. 1 FIELD OF THE INVENTION
.
,~. Tnis inven~ion rela~es in general ~o a laL;le for generating ~ aspnerical surfaces on work pieces and in par~icular generating suci ,~ 5 surfaces of revolution on a fron~ surface of an optical lens blank.
. . .
' BACKGROUND OF THE INVENTION
. .
i'~ Optical lenses designed for correcting vision deEiciencies of '~ 10 persons ilave been developed and utilized for a long period of time.
, As is t;~e case Wi~il any optical lens, it is necessary to genera-e ,~ surfaces, bot;l front and rear, of predetermined configuraLion Lo effect , a desired correction of a particul,ar patient's vision deficiency. It ~' is a common prac~ice ~o utilize an apparatus wilicn is of a maciline ,~ 15 lat'ne ~ype structure w;lerein t;le lens blank is mounted on a spir.dle -,~ winici~ is revolved w;lile a cutting ~ool is applied to tile surface for generating of a specific configuration. An example of sucil a prior ' art lati~e is disclosed in U. S; Paten~ No. 3,977,279 issued Augus~ 31, 1976 to Derrell C. Hooker. Tile latile disclosed in tHat paten~, in general, comprises a spindle for suppor~ing tne lens blank and roLation ti~ereof during surface forming opera~ions and a cu~ting tool carried ~, on a turret device ~i~at is rotatable about'an axis transverse to t;~e axis of rotation of t;le lens supporting spindle. Control mecinanism is provided ~o effect rela~ive displacement of tHe cut~ing tool in a predetermined manner during ~;le surface generating operation. T;lis , ,:' '~ 30 ., ~
. .
...
2 0 ~
1 control mecilanism includes a concave cam surface against Wi~iC;l a spring-biased tool support and cam follower cooperaLe in effecting Linis conLr over t;le surface to be generaLed. Tile surfaces tilat can be generated .~' by ~ile Hooker latile may be of not only an aspilerical configuration, buL may also be spilerical. Tile parLicular configuraLion is dependen~
upon tile settings of t;le various components of tile appara~us and particularlyas Co Lile control elements.
SUMMARY OF THE INVENTION
~'' 10 Tile present invention provides an improved laLile ilaving superior capabilities of generating desired surfaces on work pieces SUCil as contac~ lens blanks. Tile improved la~;~e includes tile general basic components of a ro~atable spindle for supporting ~ile lens blank, a turret assembly carrying Lile len3 cu~ting tool and a con~rol cam assembly. Tne control cam assembly suppor~s a roller cam in a prede~ermined position wit;l respect to t;le turret assembly. Mounted on tile turret assembly is a cutting tool support tHat not only carries tile cutLing ~ool, but also carries a cam follower. Tine supporLs for tile cut~ing tool and cam follower are spring-biased ~o maintain tile follower in engagement wi~;l t;le roller cam as tile ~urret assembly is revolved in ~ effecting a cutting operation. In accordance Witil tilis invention, ~He ; cam follower i~as a V-silaped configura~ion including divergent side A walls ~Hat extend at a prede~ermined angle Co eacil otiler and from an - 25 apex tilat ilas a small radius curvature. In setting up tile latine, tile roller cam is positioned at a predetermined point witH respect t-o ile ; axis of rotation of tite turret assembly. Tile cutting tool and cam follower supports are relatively adjus~able and positionable on tile urret assembly. Tiley are prepositioned witil respec~ to tHe axis of rotation of ~ile ~urre~ assembly in accordance wiCil tile posi-ion of tile roller cam and are set to develop or generaLe a predeLermined surface on tile lens blank.
; Tbe improved s~ructure of tile cam and cam follower in tile ~ 35 latine of tiliS inven~ion are capable of effec~ing a precise surface - 203~
: 1 configuracion wilicil, in Cile case of a conCacC lens, is of an opCic design Cila~ i9 necessary Co effecC Cile appropriaCe correcLion for a particular paCienC. AddiCionally, Cile improved cam and cam follower mecilanism are capable of conCrolling tile generaCion of Cile surface Co a desired silape WiCilouC disconCinuicies Cilrougi~ou~ e ex~enC of ~ile opCically effecCive porCion and Cilereby avoid any disconCinuities in : Cile area or region of tile lens CilaC effecCs Cile opCical correcLion.
One aspec~ of ~ili9 invenCion is a laC;le for generaCing surfaces of revoluCion on a work piece comprising a base; a spindle assembly -- mounced on said base and including an elongaCed, roCaCably suppor~ed spindle ilaving a longiCudinal axis and an end for mounCing of a work piece Cnereon and means for roCa~ing said spindle, said spindle axis being disposed in a predeCermined plane; a CurreC assembly mounCed on 15 said base and including a ro~a~able base mounC for pivoCally suppor~ing said CurreC assembly for revoluCion abouC a verCical axis of roCaCion disposed cransversely ~o said spindle axis, a cam follower and cuCCing Cool supporC assembly secured Co said base mounC for relaCive dis-placemenC along an axis of displacemen~ in a plane disposed in Cransverse relacionsilip Co said verCical axis of roCation of said CurreC assembly, a cam follower ilaving an end porCion of V-silaped configuraCion ilaving ~ an apex and side walls divergenC from said apex, a cuCCing Cool and -`~ resilienc biasing means for urging said cam follower and cutCing cool supporC assembly in a predeCermined direcCion along said axis of dis-;~ 25 placemenc; and a conCrol cam assembly mounCed on said base and including ` a cam ilaving a convexly arcuaCe camming surface disposed in radially .. ` spaced relacionsilip Co a vertical axis of said cam and againsC wilici said cam follower bears, and a supporC assembly for supporCing and posiCioning said cam wi~il iCs verCical axis disposed parallel ~o i~e axis of roCaCion of said Currec assembly.
T;lese and oCiler objecCs and advancages of Cilis invenCion will be readily apparenC from Cile following deCailed descripCion of ile - embodimenc Cilereof and Cile accompanying drawings.
~fi~
~?~' FIGURE 1 is a side elevaLional Yiew of a lati~e embodying tilis ` invention FIGURE 2 is a ~op plan view of ~ile la~i~c ':
` FIGURE 3 is a fragmentary sectional view ~aken along line 3-3 j~ of FIGURE 1 :, 10 FIGURE 4 is a medial cross-sectional view of a conLacL lens ilaving surfaces generated by tile la~ile apparatus FIGURES 5 and 6 are sequen~ial diagramma~ic illus~rations of , 15 LHe rela~ive posi~ioning of ~i~e cam and cam follower as results from `~ revolution of ~ile turret assembly ~ DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENT
: _ Having reference in par~icular ~o FIGURES 1 and 2 of tile drawings, ; ~ile latile appara~us i8 seen to include as ~ile basic component a base 10, spindle assembly 11, turre~ assembly 12 and control cam assembly 13 Eacil of t;le spindle, ~urret and control cam asscmblies 11, ]2 and 13 are moun~ed on ~i~e base 10 Tbe spindle assembly ll includes a moun~ing frame 14 carrying a~ i~s upper side a spindle suppor~ drive 15 Lilat ilas an elongated spindle 16 adapted ~o carry a work piece sucil as a lens blank L a~ iLs free end As is conventional in a la~ile of ~ilis ~ype, ~ile spindle 16 is suppor~ed for ro~a~ion about a ilorizon~al axis Incorpora~ed in Lile spindle support drive 15 buL noC specifically illustra~ed, is a drive mecilanism of a ~ype generally u~ilized in lens cut~ing appara~us of tilis na~ure and may include a gear mecilanism capable of ob~aining differenL rotational speeds as between an elec~ric drive mo~or and tile spindle 16 Sucil components are well-known Lo tilose skilled in tilis `~ ~03~
1 par~icular ar~ and ~i~us Liley are noL illus~raLed in furLiler de~ail.
Tile mounting frame 14 in tilis lat;~e apparaLus is of a ~ype Lilat permiLs selecLive adjus~ment of its position on tile base along an axis Lila~
parallels tile spindle. Ti~is adjusting mecilanism includes coopera~ing guide ways 17 fixed on t;le Lop sur~ace of Llle base 10 ancl formed in ~ile lower porLion of ~ile mounting frame 14. A screw ~ilread adjus~ing device 18 is provided and manually operable Lilrougi~ a band wbeel 19 ~o effecL positioning of ~ile spindle assembly 11 a~ a desired poin~.
Displaced from ~ile spindle assembly 11 is ~ile ~urreL a.s.sembly 12 and i~ is posi~ioned along tile longiLudinal axis of Lile spindle.
Tilis turre~ assembly 12 includes a roLa~able base mount 20 ilaving a vertical pivoL axis designaLed as 21. Tilis roLaLable base moun~ 20 includes a bo~om por~ion 22 WiliCil iS adapLed Lo be fixed ~o L;le upper - 15 surface of ~ile base and an upper secLion L;la~ is relatively roLaLable wiLil respec~ ~o L;le bo~tom. Secured Lo Lile upper sec~ion 23 is an elongated mounLing pla~e 24. MounLed on Cile plaLe 24 is a cam follower and cuL~ing Lool support assembly 25. Tilis suppor~ assembly 25 includes a cam follower mecilanism 26 WiliCil i9 disposed nexL above ~ile moun~ing plaLe 24 and a cu~ing tool nolder 27.
' Tile cam follower mecilanism 26 comprises a cam follower 28 Li~at includes as iLs basic componenL a flaL plaLe ilaving an end porLion formed wiLi1 side walls 29 LilaL converge Loward an apex 30 as can be besL seen in FIGURE 3. Tnese side walls 29 are intercohnecLed by tile generally circularly-silaped apex 30 WiliCil ilas a relaLively small radius. Also included in Lile cam follower mecnanism 26 are guide way plaLes 32 WiliCil mecilanically inLerengage wiLil ~i~e cam follower and permit its axial reciproca~ion. A screw Lilread adjusLmen~ mecilanism 33 is provided to posi~ion tile cam follower Wi~ll respec~ to Lile mounting pla~e and Lo main~ain Lile follower in ~ile selecced posiCion. Tile ` cu~ing ~ool ilolder includes an inLerconnec~ing mecilanism ~o permi~
rela~ive adjustmen~ of Lile ilolder wi~il respec~ Lo Lile cam follower mecilanism. Tilis cut~ing ~ool nolder also includes a ~ransverse slide . .
2 0 3 ~
.: -6-supporL 34 tilal: ;las a t:ool clamp 35 and carries ~;le cutLing Lool 36 adjustable Witil respec~ Lo C;le CurreC assembly 12. A spring biasing mecnanism 37 is provided and mecilanically incerconnecced as be~ween C;le mounCing plal:e 24 and Cile cam follower and cuCt:inR cool supporC
assembly 25. Tilis biasing mecilanism includes a resilicnC spring device 38 W;liC;I is operal:ional t:o urge cile cam follower and associaced componenLs in a direcCion Cilal: i9 Reneraliy Coward ~ile spindle.
Operal:ion of Lile ~urre~ assembly essen~ially consisLs of roCaLing Lile CurreC assembly abouC iCs vercical axis 21. Tilis causes tile cuCLin~
point of Clle Cool 36 Co swing across Cile forward face of cile lens blank L and Co Cilereby cul: cile desired surface. Manual operaCion of Cile CurreC assembly is facilit:at:ed by means of a ;landle 39.
T;le conCrol cam assembly 13 includes as it:s primary componenC
.~ 15 a cam ;laving a convexly arcua~:e camming surface and WiliCil, in L;lis illusl:racive embodimenc, is a roller cam 40 ;laving a cylindrical cam surface t:;~a~ is circular. T;lis roller cam is mounCed on a supporC
assembly 41 wi~ s axis of rotaCion vercically orienCed l:o be parallel ~o L;~e axis of roCaCion of C;le t:urrel: assembly. Included in C;le supporC assembly 41 is a frame strucCure w;lic;l is of an adjuscable Cype l:o permiC boc;l longil:udinal and Cransverse posil:ioning of C;le roller cam 40. Forming ~:ne adjusl:able sCrucCure is a base member 42 secured Co ~;le base 10 ~;lroug;l a guide way 43. T;le base member 42 is adjuscable longi~udinally of t:ile base and parallel Co ~ile spindle 16 Cilrougil a screw ~ilread adjusting mecnanism 44. Secured Co C;le base member 42 is an elongaLed support: arm 45 Co W;liCil C;le roller cam 40 is journalled aC iCS one end. Tile arm iCself is slLdeably secured in a guide way formed in t:;le base member 42 and is cransversely adjusCable ,k` Co a desired posil:ion WiCil respect: Lo t:;~e base member. T;lis adjusCmenC
mec;lanism permits L;le roller cam 40 Co be relacively posit:ioned as o L;le axis 21 of ~ile l:urret: assembly l:o enable t:;le lac;le Co be ucilized in forming of any particular and desired surface configural:ion on t:ile lens blank. T;lis adjusLmen~ is in cooperaLion wit:;l C;le posiCioning of Cile cam follower 28 and enables Cile operaLor Lo obCain cile desired lens curvat:ure. RelaCive positioning of tile axes 21 of L;le CurreC
.~
203~
,~ .
1 assembly and tilaL of ~;le roller cam WiliCil iS designated as 46 in FIGURES
5 and 6 can be seen ~o be rela~ively adiusLable bo~;l in a longitudinal direc~ion as well as a ~ransverse direc~ion FIGURES 5 and 6 diagramma~ically illus~raLe ~ilc funcLioning of ~i)e cam follower 28 wi~i~ respec~ to ti~e cam roller 40 In ~ilis diagrammaLic illus~raLion, i~ will be noLed ~i~a~ ~ile axis 46 of ~ile cam roller i9 loca~ed along Ll~e longi~udinal axis of ~ile laLile and wilicil longitudinal axis is excending ~i~rougn ~ile ver~ical axis 21 of ~ile ~urre~ assembly, bUL i9 spaced wi~in re~pect to ~i~e Lurre~ axis 21. Tile Lurre~
assembly is opera~ed ~o swing ~ile cu~ing ~ool 36 along a prede~ermined patil wiLi~ ti~at pa~i~ being determined by ~ile cooperative action of ~ile forward end of a cam follower 28 rela~ive ~o ~ile circular surface of ~ ~ile cam roller 40 Tilis s~ructure comprising primarily ~ile cam follower ; 15 and roller cam enables ~ile la~ilc of ~ilis inven~ion to perform a unique function in ~ile forming of a lens surface and specifically, ~i~e fron~
surface of a lens A silape tila~ can be developed for a con~acL lens is diagramma~ically illustra~ed in FIGURE 4 In Lila~ illus~ra~ion wilic;l is a medial sec~ional view of a formed lens, tile lens is seen ~o ilave a rear spilerical surface designated by t;le le~ter S ilaving a - radius R and a fron~ surface designa~ed by ~ile le~er F A lens - configura~ion ~ina~ can be developed by tile latile of tiliS invention is ~ a fron~ surface F ilaving a configuration w;lic;l, t;lroug;~out ~ile ex-cn--` of effective optical operating range, w;lic;l range is generally indicaLed by an arc A, results in a lens L;~at inas a cons~an~ ~ilickness T ~;~rougi~ouL
~;le extent of i~s operating range Variations in ~ile t;lickness T
result in different optical cinaracteristics as determined in accordance wit;~ ti~e particular patient's requirements
,. 1 FIELD OF THE INVENTION
.
,~. Tnis inven~ion rela~es in general ~o a laL;le for generating ~ aspnerical surfaces on work pieces and in par~icular generating suci ,~ 5 surfaces of revolution on a fron~ surface of an optical lens blank.
. . .
' BACKGROUND OF THE INVENTION
. .
i'~ Optical lenses designed for correcting vision deEiciencies of '~ 10 persons ilave been developed and utilized for a long period of time.
, As is t;~e case Wi~il any optical lens, it is necessary to genera-e ,~ surfaces, bot;l front and rear, of predetermined configuraLion Lo effect , a desired correction of a particul,ar patient's vision deficiency. It ~' is a common prac~ice ~o utilize an apparatus wilicn is of a maciline ,~ 15 lat'ne ~ype structure w;lerein t;le lens blank is mounted on a spir.dle -,~ winici~ is revolved w;lile a cutting ~ool is applied to tile surface for generating of a specific configuration. An example of sucil a prior ' art lati~e is disclosed in U. S; Paten~ No. 3,977,279 issued Augus~ 31, 1976 to Derrell C. Hooker. Tile latile disclosed in tHat paten~, in general, comprises a spindle for suppor~ing tne lens blank and roLation ti~ereof during surface forming opera~ions and a cu~ting tool carried ~, on a turret device ~i~at is rotatable about'an axis transverse to t;~e axis of rotation of t;le lens supporting spindle. Control mecinanism is provided ~o effect rela~ive displacement of tHe cut~ing tool in a predetermined manner during ~;le surface generating operation. T;lis , ,:' '~ 30 ., ~
. .
...
2 0 ~
1 control mecilanism includes a concave cam surface against Wi~iC;l a spring-biased tool support and cam follower cooperaLe in effecting Linis conLr over t;le surface to be generaLed. Tile surfaces tilat can be generated .~' by ~ile Hooker latile may be of not only an aspilerical configuration, buL may also be spilerical. Tile parLicular configuraLion is dependen~
upon tile settings of t;le various components of tile appara~us and particularlyas Co Lile control elements.
SUMMARY OF THE INVENTION
~'' 10 Tile present invention provides an improved laLile ilaving superior capabilities of generating desired surfaces on work pieces SUCil as contac~ lens blanks. Tile improved la~;~e includes tile general basic components of a ro~atable spindle for supporting ~ile lens blank, a turret assembly carrying Lile len3 cu~ting tool and a con~rol cam assembly. Tne control cam assembly suppor~s a roller cam in a prede~ermined position wit;l respect to t;le turret assembly. Mounted on tile turret assembly is a cutting tool support tHat not only carries tile cutLing ~ool, but also carries a cam follower. Tine supporLs for tile cut~ing tool and cam follower are spring-biased ~o maintain tile follower in engagement wi~;l t;le roller cam as tile ~urret assembly is revolved in ~ effecting a cutting operation. In accordance Witil tilis invention, ~He ; cam follower i~as a V-silaped configura~ion including divergent side A walls ~Hat extend at a prede~ermined angle Co eacil otiler and from an - 25 apex tilat ilas a small radius curvature. In setting up tile latine, tile roller cam is positioned at a predetermined point witH respect t-o ile ; axis of rotation of tite turret assembly. Tile cutting tool and cam follower supports are relatively adjus~able and positionable on tile urret assembly. Tiley are prepositioned witil respec~ to tHe axis of rotation of ~ile ~urre~ assembly in accordance wiCil tile posi-ion of tile roller cam and are set to develop or generaLe a predeLermined surface on tile lens blank.
; Tbe improved s~ructure of tile cam and cam follower in tile ~ 35 latine of tiliS inven~ion are capable of effec~ing a precise surface - 203~
: 1 configuracion wilicil, in Cile case of a conCacC lens, is of an opCic design Cila~ i9 necessary Co effecC Cile appropriaCe correcLion for a particular paCienC. AddiCionally, Cile improved cam and cam follower mecilanism are capable of conCrolling tile generaCion of Cile surface Co a desired silape WiCilouC disconCinuicies Cilrougi~ou~ e ex~enC of ~ile opCically effecCive porCion and Cilereby avoid any disconCinuities in : Cile area or region of tile lens CilaC effecCs Cile opCical correcLion.
One aspec~ of ~ili9 invenCion is a laC;le for generaCing surfaces of revoluCion on a work piece comprising a base; a spindle assembly -- mounced on said base and including an elongaCed, roCaCably suppor~ed spindle ilaving a longiCudinal axis and an end for mounCing of a work piece Cnereon and means for roCa~ing said spindle, said spindle axis being disposed in a predeCermined plane; a CurreC assembly mounCed on 15 said base and including a ro~a~able base mounC for pivoCally suppor~ing said CurreC assembly for revoluCion abouC a verCical axis of roCaCion disposed cransversely ~o said spindle axis, a cam follower and cuCCing Cool supporC assembly secured Co said base mounC for relaCive dis-placemenC along an axis of displacemen~ in a plane disposed in Cransverse relacionsilip Co said verCical axis of roCation of said CurreC assembly, a cam follower ilaving an end porCion of V-silaped configuraCion ilaving ~ an apex and side walls divergenC from said apex, a cuCCing Cool and -`~ resilienc biasing means for urging said cam follower and cutCing cool supporC assembly in a predeCermined direcCion along said axis of dis-;~ 25 placemenc; and a conCrol cam assembly mounCed on said base and including ` a cam ilaving a convexly arcuaCe camming surface disposed in radially .. ` spaced relacionsilip Co a vertical axis of said cam and againsC wilici said cam follower bears, and a supporC assembly for supporCing and posiCioning said cam wi~il iCs verCical axis disposed parallel ~o i~e axis of roCaCion of said Currec assembly.
T;lese and oCiler objecCs and advancages of Cilis invenCion will be readily apparenC from Cile following deCailed descripCion of ile - embodimenc Cilereof and Cile accompanying drawings.
~fi~
~?~' FIGURE 1 is a side elevaLional Yiew of a lati~e embodying tilis ` invention FIGURE 2 is a ~op plan view of ~ile la~i~c ':
` FIGURE 3 is a fragmentary sectional view ~aken along line 3-3 j~ of FIGURE 1 :, 10 FIGURE 4 is a medial cross-sectional view of a conLacL lens ilaving surfaces generated by tile la~ile apparatus FIGURES 5 and 6 are sequen~ial diagramma~ic illus~rations of , 15 LHe rela~ive posi~ioning of ~i~e cam and cam follower as results from `~ revolution of ~ile turret assembly ~ DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENT
: _ Having reference in par~icular ~o FIGURES 1 and 2 of tile drawings, ; ~ile latile appara~us i8 seen to include as ~ile basic component a base 10, spindle assembly 11, turre~ assembly 12 and control cam assembly 13 Eacil of t;le spindle, ~urret and control cam asscmblies 11, ]2 and 13 are moun~ed on ~i~e base 10 Tbe spindle assembly ll includes a moun~ing frame 14 carrying a~ i~s upper side a spindle suppor~ drive 15 Lilat ilas an elongated spindle 16 adapted ~o carry a work piece sucil as a lens blank L a~ iLs free end As is conventional in a la~ile of ~ilis ~ype, ~ile spindle 16 is suppor~ed for ro~a~ion about a ilorizon~al axis Incorpora~ed in Lile spindle support drive 15 buL noC specifically illustra~ed, is a drive mecilanism of a ~ype generally u~ilized in lens cut~ing appara~us of tilis na~ure and may include a gear mecilanism capable of ob~aining differenL rotational speeds as between an elec~ric drive mo~or and tile spindle 16 Sucil components are well-known Lo tilose skilled in tilis `~ ~03~
1 par~icular ar~ and ~i~us Liley are noL illus~raLed in furLiler de~ail.
Tile mounting frame 14 in tilis lat;~e apparaLus is of a ~ype Lilat permiLs selecLive adjus~ment of its position on tile base along an axis Lila~
parallels tile spindle. Ti~is adjusting mecilanism includes coopera~ing guide ways 17 fixed on t;le Lop sur~ace of Llle base 10 ancl formed in ~ile lower porLion of ~ile mounting frame 14. A screw ~ilread adjus~ing device 18 is provided and manually operable Lilrougi~ a band wbeel 19 ~o effecL positioning of ~ile spindle assembly 11 a~ a desired poin~.
Displaced from ~ile spindle assembly 11 is ~ile ~urreL a.s.sembly 12 and i~ is posi~ioned along tile longiLudinal axis of Lile spindle.
Tilis turre~ assembly 12 includes a roLa~able base mount 20 ilaving a vertical pivoL axis designaLed as 21. Tilis roLaLable base moun~ 20 includes a bo~om por~ion 22 WiliCil iS adapLed Lo be fixed ~o L;le upper - 15 surface of ~ile base and an upper secLion L;la~ is relatively roLaLable wiLil respec~ ~o L;le bo~tom. Secured Lo Lile upper sec~ion 23 is an elongated mounLing pla~e 24. MounLed on Cile plaLe 24 is a cam follower and cuL~ing Lool support assembly 25. Tilis suppor~ assembly 25 includes a cam follower mecilanism 26 WiliCil i9 disposed nexL above ~ile moun~ing plaLe 24 and a cu~ing tool nolder 27.
' Tile cam follower mecilanism 26 comprises a cam follower 28 Li~at includes as iLs basic componenL a flaL plaLe ilaving an end porLion formed wiLi1 side walls 29 LilaL converge Loward an apex 30 as can be besL seen in FIGURE 3. Tnese side walls 29 are intercohnecLed by tile generally circularly-silaped apex 30 WiliCil ilas a relaLively small radius. Also included in Lile cam follower mecnanism 26 are guide way plaLes 32 WiliCil mecilanically inLerengage wiLil ~i~e cam follower and permit its axial reciproca~ion. A screw Lilread adjusLmen~ mecilanism 33 is provided to posi~ion tile cam follower Wi~ll respec~ to Lile mounting pla~e and Lo main~ain Lile follower in ~ile selecced posiCion. Tile ` cu~ing ~ool ilolder includes an inLerconnec~ing mecilanism ~o permi~
rela~ive adjustmen~ of Lile ilolder wi~il respec~ Lo Lile cam follower mecilanism. Tilis cut~ing ~ool nolder also includes a ~ransverse slide . .
2 0 3 ~
.: -6-supporL 34 tilal: ;las a t:ool clamp 35 and carries ~;le cutLing Lool 36 adjustable Witil respec~ Lo C;le CurreC assembly 12. A spring biasing mecnanism 37 is provided and mecilanically incerconnecced as be~ween C;le mounCing plal:e 24 and Cile cam follower and cuCt:inR cool supporC
assembly 25. Tilis biasing mecilanism includes a resilicnC spring device 38 W;liC;I is operal:ional t:o urge cile cam follower and associaced componenLs in a direcCion Cilal: i9 Reneraliy Coward ~ile spindle.
Operal:ion of Lile ~urre~ assembly essen~ially consisLs of roCaLing Lile CurreC assembly abouC iCs vercical axis 21. Tilis causes tile cuCLin~
point of Clle Cool 36 Co swing across Cile forward face of cile lens blank L and Co Cilereby cul: cile desired surface. Manual operaCion of Cile CurreC assembly is facilit:at:ed by means of a ;landle 39.
T;le conCrol cam assembly 13 includes as it:s primary componenC
.~ 15 a cam ;laving a convexly arcua~:e camming surface and WiliCil, in L;lis illusl:racive embodimenc, is a roller cam 40 ;laving a cylindrical cam surface t:;~a~ is circular. T;lis roller cam is mounCed on a supporC
assembly 41 wi~ s axis of rotaCion vercically orienCed l:o be parallel ~o L;~e axis of roCaCion of C;le t:urrel: assembly. Included in C;le supporC assembly 41 is a frame strucCure w;lic;l is of an adjuscable Cype l:o permiC boc;l longil:udinal and Cransverse posil:ioning of C;le roller cam 40. Forming ~:ne adjusl:able sCrucCure is a base member 42 secured Co ~;le base 10 ~;lroug;l a guide way 43. T;le base member 42 is adjuscable longi~udinally of t:ile base and parallel Co ~ile spindle 16 Cilrougil a screw ~ilread adjusting mecnanism 44. Secured Co C;le base member 42 is an elongaLed support: arm 45 Co W;liCil C;le roller cam 40 is journalled aC iCS one end. Tile arm iCself is slLdeably secured in a guide way formed in t:;le base member 42 and is cransversely adjusCable ,k` Co a desired posil:ion WiCil respect: Lo t:;~e base member. T;lis adjusCmenC
mec;lanism permits L;le roller cam 40 Co be relacively posit:ioned as o L;le axis 21 of ~ile l:urret: assembly l:o enable t:;le lac;le Co be ucilized in forming of any particular and desired surface configural:ion on t:ile lens blank. T;lis adjusLmen~ is in cooperaLion wit:;l C;le posiCioning of Cile cam follower 28 and enables Cile operaLor Lo obCain cile desired lens curvat:ure. RelaCive positioning of tile axes 21 of L;le CurreC
.~
203~
,~ .
1 assembly and tilaL of ~;le roller cam WiliCil iS designated as 46 in FIGURES
5 and 6 can be seen ~o be rela~ively adiusLable bo~;l in a longitudinal direc~ion as well as a ~ransverse direc~ion FIGURES 5 and 6 diagramma~ically illus~raLe ~ilc funcLioning of ~i)e cam follower 28 wi~i~ respec~ to ti~e cam roller 40 In ~ilis diagrammaLic illus~raLion, i~ will be noLed ~i~a~ ~ile axis 46 of ~ile cam roller i9 loca~ed along Ll~e longi~udinal axis of ~ile laLile and wilicil longitudinal axis is excending ~i~rougn ~ile ver~ical axis 21 of ~ile ~urre~ assembly, bUL i9 spaced wi~in re~pect to ~i~e Lurre~ axis 21. Tile Lurre~
assembly is opera~ed ~o swing ~ile cu~ing ~ool 36 along a prede~ermined patil wiLi~ ti~at pa~i~ being determined by ~ile cooperative action of ~ile forward end of a cam follower 28 rela~ive ~o ~ile circular surface of ~ ~ile cam roller 40 Tilis s~ructure comprising primarily ~ile cam follower ; 15 and roller cam enables ~ile la~ilc of ~ilis inven~ion to perform a unique function in ~ile forming of a lens surface and specifically, ~i~e fron~
surface of a lens A silape tila~ can be developed for a con~acL lens is diagramma~ically illustra~ed in FIGURE 4 In Lila~ illus~ra~ion wilic;l is a medial sec~ional view of a formed lens, tile lens is seen ~o ilave a rear spilerical surface designated by t;le le~ter S ilaving a - radius R and a fron~ surface designa~ed by ~ile le~er F A lens - configura~ion ~ina~ can be developed by tile latile of tiliS invention is ~ a fron~ surface F ilaving a configuration w;lic;l, t;lroug;~out ~ile ex-cn--` of effective optical operating range, w;lic;l range is generally indicaLed by an arc A, results in a lens L;~at inas a cons~an~ ~ilickness T ~;~rougi~ouL
~;le extent of i~s operating range Variations in ~ile t;lickness T
result in different optical cinaracteristics as determined in accordance wit;~ ti~e particular patient's requirements
Claims (8)
1. A lathe for generating surfaces of revolution on a work piece comprising a base;
a spindle assembly mounted on said base and including an elongated, rotatably supported spindle having a longitudinal axis and an end for mounting of a work piece thereon and means for rotating said spindle, said spindle axis being disposed in a predetermined plane;
a turret assembly mounted on said base and including a rotatable base mount for pivotally supporting said turret assembly for revolution about a vertical axis of rotation disposed transversely to said spindle axis, a cam follower and cutting tool support assembly secured to said base mount for relative displacement along an axis of displacement in a plane disposed in transverse relationship to said vertical axis of rotation of said turret assembly, a cam follower having an end portion of V-shaped configuration having an apex and side walls divergent from said apex, a cutting tool and resilient biasing means for urging said cam follower and cutting tool support assembly in a predetermined direction along said axis of displacement;
and a control cam assembly mounted on said base and including a cam having a convexly arcuate camming surface disposed in radially spaced relationship to a vertical axis of said cam and against which said cam follower bears, and a support assembly for supporting and positioning said cam with its vertical axis disposed parallel to the axis of rotation of said turret assembly.
a spindle assembly mounted on said base and including an elongated, rotatably supported spindle having a longitudinal axis and an end for mounting of a work piece thereon and means for rotating said spindle, said spindle axis being disposed in a predetermined plane;
a turret assembly mounted on said base and including a rotatable base mount for pivotally supporting said turret assembly for revolution about a vertical axis of rotation disposed transversely to said spindle axis, a cam follower and cutting tool support assembly secured to said base mount for relative displacement along an axis of displacement in a plane disposed in transverse relationship to said vertical axis of rotation of said turret assembly, a cam follower having an end portion of V-shaped configuration having an apex and side walls divergent from said apex, a cutting tool and resilient biasing means for urging said cam follower and cutting tool support assembly in a predetermined direction along said axis of displacement;
and a control cam assembly mounted on said base and including a cam having a convexly arcuate camming surface disposed in radially spaced relationship to a vertical axis of said cam and against which said cam follower bears, and a support assembly for supporting and positioning said cam with its vertical axis disposed parallel to the axis of rotation of said turret assembly.
2. A lathe according to claim 1 wherein said cam is a roller mounted for rotation about said cam's vertical axis.
3. A lathe according to claim 2 wherein said cam's surface is cylindrical.
4. A lathe according to claim 3 wherein said cam's cylindrical surface is circular.
5. A lathe according to claim 1 wherein said cam follower apex is of circular configuration.
6. A lathe according to claim 1 wherein said cam follower apex is of circular configuration.
7. A lathe according to claim 1 wherein said cam follower side walls are of planar configuration.
8. A lathe according to claim 7 wherein said cam follower apex is of arcuate configuration and said side walls are in tangent relationship thereto.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2036590 CA2036590C (en) | 1991-02-19 | 1991-02-19 | Lathe for generating asperical surface on work pieces |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2036590 CA2036590C (en) | 1991-02-19 | 1991-02-19 | Lathe for generating asperical surface on work pieces |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2036590A1 CA2036590A1 (en) | 1992-08-20 |
| CA2036590C true CA2036590C (en) | 1994-05-31 |
Family
ID=4147022
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2036590 Expired - Lifetime CA2036590C (en) | 1991-02-19 | 1991-02-19 | Lathe for generating asperical surface on work pieces |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2036590C (en) |
-
1991
- 1991-02-19 CA CA 2036590 patent/CA2036590C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2036590A1 (en) | 1992-08-20 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed | ||
| MKEC | Expiry (correction) |
Effective date: 20121202 |