Automatic turret indexing mechanism for lathes

April 21, 1953 Filed July 2. 1947 L. E. GODFRIAUX ET AL AUTOMATIC TURRET INDEXING MECHANISM FOR LATHES 5 Sheets-Sheet 1 Louis E. Goqfriczzzx Charles H. Johnson INVENTORSI ATTORNEY:

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April 21, 1953 E. GODFRIAUX ET AL 5,3

AUTOMATIC TURRET INDEXING MECHANISM FOR LATHES Filed July 2, 1947 5 Sheets-Sheet 2 g Louis ffiadjriaux N I 3 Charles H. Johnson R I a: INVENTOREI ATTORNEY.

Ap 1953 E. GODFRIAUX ET AL 2,635,326

AUTOMATIC TURRET INDEXING MECHANISM FOR LATHES Filed July 2. 1947 5 Sheets-Sheet 4 FIG. 6.

Louzlv'EGcjf Charles H. o

INVENTORfi.

ATTORNEY.

April 21, 1953 L. E. GODFRIAUX ET AL AUTOMATIC TURRET INDEXING MECHANISM FOR LATHES Filed July 2, 1947 5 Sheets-Sheet 5 FIG. 7.

' Patented Apr. 21, 1953 AUTOMATIC TURRET INDEXING' MECHANISM FOR'LATHES Louis E. Godfriaux and Charles H. Johnson, Madison, Wis., assignors to Gisholt Machine Company, Madison, Wis., a corporation of Wisconsin Application July 2, 1947, Serial No. 758,500.

6 Claims. (Cl. 29---50) This invention relates to an automatic turret indexing mechanism for lathes.

The principal object of the invention is to provide a simple power driven indexing mechanism for a-turret.

Another object of the invention is to provide a compact mechanism Within the base of the turret for operating the lock bolt, theclam ring and the indexing of the turret from a single drive shaft. 7

Another object is to provide a Geneva movement indexing mechanism for the turret in which the Geneva plate is secured to the bottom of the turret beneath the same, thereby leaving the in- ;side of the turret substantially open and. free for the clamping. of tool supports and the like.

Another object is to provide a simple and more dependable mechanism for operating the lock bolt for the turret.

Another object is toprovide an enclosed and more dependable and compact mechanism for d operating the clamp ring for the turret.

Another object is to provide a more dependable and improved clutch mechanism for operating the rotary indexing shaft for the turret and to eliminate dependence upon the movement of the Y turret carriage to carry out the indexing operation. Another object is to utilize movement of the turret carriage to initiate indexing and to utilize the drive motor for the lathe to effect the indexing of the turret.

Other objects of the invention will appear in the description of an embodiment of the inven- I tion illustrated in the drawings.

In'the drawings:

" Figure 1 is a side elevation of an automatic lathe embodying the invention;

"Figure 2 is an enlarged rear end elevation the lathe showing the index drive; 7 V

Fig. 31s a horizontal section takenon line 3-4 of Fig. 2 and showing the index clutch and drive; i

Fig. 4 is a detail view showing the trip control; Fig. 5 is a top plan view of the turret and adjacent parts of the lathe;

Fig. 6 is a top plan view of the turret base with .the turret removed and parts broken away and.

sectioned; g

Fig. 7 is a vertical section through the turret and its base taken on the line 1-1 of Fig. 5 and showing the Geneva movement mechanism;

Fig. 8 is a detail vertical sectional view taken on broken line 8-8 of Fig. 6 showing the mecha- I nism for operating the turret clamp and lock bolt; and

Fig. 9 is a detail sectional view showing the locking pin construction.

The lathe illustrated in the drawing is substantially the same as that set forth in the copending application of Louis E. Godfriaux, Serial No. 597,268, filed June 2, 1945, for Automatic Turret Lathe, and which issued. to Patent No. 2,565,305 on August 21, 1951.

The lathe comprises a bed Lheadstock 2, turret carriage 3 and tool post carriage 4.

The bed I extends for the length of the lathe and is supported on legs 5 with a c'hipand coolant pan 6 extending around the same at a position spaced from the floor;

The headstock 2 extends upwardly at the lefthand end of the bed I and contains the gear change mechanism for driving the spindle I mounted for rotation therein. A motor 8 drives the headstock by means of belt 9.

The turret carriage 3 is mounted on ways ID on bed I for reciprocation longitudinally of the bed in a direction parallel to the spindle 1. A turret II is mounted on carriage 3 and is adapted to be rotated on a vertical axis to different indexed positions presenting successive faces toward the spindle.

The tool carriage 4 is mounted on the ways l0 between carriage 3 andthe headstock 2 and carries a tool post l2 on a cross slide l3 adapted to move transversely of spindle 1.

The present invention is directed to the mechanism for automatically indexing the turret ll upon reciprocation of carriage 3 as set forth in the copending application referred to above.

For this purpose, the bed I has a housing It at its rear end containing a clutch mechanism l5 and trip is for indexing the turret. The clutch mechanism may beef any suitable type such as a toothed clutch such as that shown ora ball clutch, or the like. 7

The clutch mechanism I5 illustrated has a geared clutch member I? rotatablymounted on a transverse shaft I8 and driven by a beveled gear on the rear end ofthe traverse shaft IS. The shaft l9 extends to the forward end of the lathe and is driven by the motor 8. i

The clutch mechanism l5 also has a driven element 2U axially movable on shaft l8 and keyed to rotate the shaft l8 when the element 20 is moved into clutching engagement with clutch member I1. A spring 2| is disposed in the clutch to normally hold clutch element 20 out of engagement with clutch member l1.

aitsr a rede e mi eq g} limited" downward mov it he in hen ee rid fees at ha s the messi m i r Q e. tq vq o o rati n. b for he rs tri ped r th 19a thereby s ip in The trip l6 for opening and closing the clutch l has a bell crank lever 22 pivoted in the front wall of housing I4, with one arm bifurcated and pivoted to shoes 23 riding freely in a circumferential groove in clutch element 20, and with its other arm extending transversely of the lathe in the path of movement of a push rod 24 on carriage 3, so that when carriage 3 is retracted rear:-

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wardly from a machining operation, rod 24 engages lever 22 and moves clutch element 20 into clutching engagement with clutch member l1 against spring 2|.

The rod 24 is spring pressed rearwardly toward the lever 22 by spring 25 disposed between a flange 26 or cross pin on the rod and a'fix'e'd supporting lug 2'! on carriage 3, so that the carriage may have limited movement rearwardly after rod- 24 reaches its limit of movement in closing clutch l5.

vThe c osing o c utch fie s driving 9 shaf 18 by shaft 'ltandthereb operatesthe'indexing .hi hapism r rre M he lu h .5 is

opened by spring zl'upon release of the lever 22 t ea s died t e 'hi xih'e hi the turret T lhe release of lever may be efiected are. 'Q i e h nis h r e asin i h ei e sm p cation above refer to; {inothermeohanism rher l' j h ei ha ism s n empl ys a rip I r "time reararmjer lev rgz and supported 'in a slot therein by a vertical spring y eirient. The arm 28 normally extends above the'ilevel of arm 22 and member. enga ed by t fdpf had lgownwa'rd movement "er arm disengages it fro rod gran releases the latterand' also the lever 2 The trip arm 2 8 is operated to release clutch is b m ans o a s 9 @in' t e n rm dr 4 provided forfcontrolling the "feeding" movements I in exing qr the'turret ,he con rel drum} xtends along the front a bed I adjacent the "path or "movement .of

strin s i a ha a l lit i hill-115ml faces 4. go esponding "tdt'h'e index faces of turret If and insane shire f9; enita a 9 prisesa eal" an th ear ,mi afthe r the mea at e\ drum and sswnwahi vupon s me et' h at; the inqe., ie 913 93 19 i eac nst lm the inactive turret face.

.Ihe ear 32 has a 9 motion connectipn to h dru sh ft; firmi tihe-thedrum to. be curate am c sh ndexe p sition hyv means; f a shr ne Pre sed la k in it enterin a ecess 35 The in ex n bf t rre 1.1 is. effected by th V predetermined wtfii ongf shaft lfi at thesame time as drum 3!! is indexed. For this purpose a V shaft 39 journaled in bearings in carriage 3.

standing base 49 on carriage 3.

" an operating position to which has beepin- The turret I I is mounted for rotation on an up- For this purpose the base 48 has a cylindrical flange 4! with a vertical opening and having its upper end tapered to provide a conical seat 42 for centering the turret thereon. A central vertical spindle 43 is secured at the lower end on the sleeve-like flange 4| and extendsupwardly through the bottom 44 of the turret to support a bearing 45 therefor.

The bottom 44 of turret II has a downwardly depending cylindrical sleeve 46- fitting around the spindle 4? A cylindrical bearing member 4 1 is secured on bottom 44' for containing bearing 45. The turret II has a generally'hexagQ'ria-lly shaped upstanding'rim fit'for the attachment of various working tools for the lathe, the sides of the rim determining the several index positions for the turret, each with one side facing the lathe spindle. """Iheturret I l is supported on base 419 by means of an outer circular flange member'Mextending downwardly from bottomv 44 beneath rim 48 and bearing upon a corresponding complementary circular bearing surface 53 on the base'illll The member &9 has an outwardly tapered circume tia f a e .4 a d hear n arf et -ha a corresponding complementary outwardly tapered circumferential flange 52. The tapered flange5 I and fig'are securedtogether'by a clan' ping ring 53' having a tapered inner recess or groove ferreceiving the flanges. 4

The band 53 extends around the'turret n and base 40 enclosing'the flanges 5! endeared has its ends pivot'ally secured "to a vertically disposed rotaryshaft 54 located in a cornerof extension base 45 and driven directly from indexing shaft 139 by the'worm gear- 55 on the latter meshing with re 55 oh h ffli- The vertical shaft 54 has an eccentric upper rank membe 51 s p ar ihe n ppo ee vq crank p h. 5?; nd the hp si e e Qf an .3 ar di i y sw ar he cdr sp'o bi s' ran'k' fi and 58s'0 that upon rotation of shaft 54 by themseins sha th eevehtr c ra k fi t. IQQ the. ba 5,3, re eas ng t e t r 'for in A then tighten the band 5 3 to secure th The indexing r turret l by rotation of' 'shaft 81 e fec ed. b alG fieva hp n efit i po li' the top of e if. heeeaih' h b tta m the turret. The Gea v'a mo /entree prisesa rotary member 59" disposed vertically in base 40 and-bf substantial diameter with aneccentric pin 6!! mounted on its upper end and extending mm a cam track 6t prdvidedon thebottoin of plate 65 and shaped to eifect rotation of turret l I upon rotation of member. 59. 1

The cam track 61 is formed by a plurality of I cam plates 62. boltedtoi the bottom of plate of turret II and angularly shaped to. provide. a

; separate radial groove. or cam track sectionibetw en ach cent pla e. and a curved: roove or am ack: section joinin each pair of radial an; a i s tiohs aihah se i ach late he r ihespihd g 4.3,- Ea h. la e an; upward-1 extending dowel 63 passing through a done-- in its several operating positions.

sponding hole in plate 44 to take the load from the securing bolts during rotation of the turret by pin 60.

The member 59 is disposed on a radius from the center of turret ll substantially at right angles to the longitudinal center line of the turret so that when the turret is indexed and a face thereof is operatively positioned facing the spindle I the pin 69 is close to spindle 43 and in the circular or curved section of a cam track.

When the member 59 is rotated the pin 69 travels from a curved section of the cam track to a radial section thereof and outwardly in the latter section and then inwardly therein to the next curved section of the cam track, and in doing so the pin 6|] acting on the adjacent plates 62 causes a rotation of turret II to present the next face in line with spindle 1.

The acceleration and deceleration of the turret in its rotary movement is gradualby reason of the gradual merger of the curved and radial sections of the cam track 6| and the curved path of movement of pin 69. The pin 66 is free from stress when the turret H is in indexed position by reason of the fact that the pin is disposed stationaryin the center of the curved section of cam track 6| where the Walls of the track face only radially of the turret and there is no tendency for the pin to effect rotary movement of the turret or to hold the same against rotation.

The member 59 is rotated by indexing shaft 39 through the beveled gear 64 on the end of the shaft whichmeshes with the gear 65 on the lower end of the member 59.

Alocking pin 66 accurately locates turret II For this purposethe locking pin 66 is vertically mounted in base 40 and extends upwardly into a recess 61 in the bottom of the corresponding plate 62 beneath the dowel 63 Where it interlocks with the plate and holds the turret accurately indexed during tightening of the clamp band 53.

The locking pin 66 is released, simultaneously with the loosening of clamp 53, by means of cam 68 on member 59. For this purpose a cross rack 69 is disposed radially of member 59 and has a cam follower 10 engaging cam 68. An adjustable spring H is disposed at the outer end of rack 69 and biases the same toward the member 59 so that the cam 68 operates against the spring in moving the rack 69.

Gear teeth on rack 69 mesh with gear 12 on a cross shaft 13 extending to a position adjacent to pin 66, and a gear 14 on shaft 13 meshes with gear teeth 15 on the pin 66. The pin 66 is supported and pressed vertically upward by a spring 16 in the base 40.

When the member 59 is rotated, cam 68 pushes rack 69 outwardly against spring H, thereby rotating shaft 13 and pulling locking pin 66 downwardly against spring 16 to release the locking pin from recess 61 and free turret H for turning. A radial drop in the cam 68 near the opposite side of member 59 provides for insertion of the locking pin 66 in the next recess 61 under the biasing influence of spring H and spring 16 as soon as member 59 has turned the turret to the next indexing position.

In summary, when carriage 3 moves to the rear end of bed I the trip rod 24 presses lever 22 closing the clutch l5 and thereby effecting rotation of shaft [8 by the traverse shaft l9 from motor 9. Rotation of shaft I8 causes a corresponding rotation of the indexing shaft 39 which then loosens clamp 53 by means of worm gear 55 and 6 cranks 51 and 58, withdraws locking pin 86 by means of cam 68, rack 69 and shaft 13, and rotates turret II to the next index position by means of member 59, eccentric pin and cam track 6|.

As pin 69 approaches its dead center stationary position in cam track 6|, cam 68 lowers a1- lowing spring H to push rack 69 inwardly and spring 16 to push locking pin 66 upwardly into locking position to locate turret II, and eccentric cranks 5'1 and 58 operate to tighten clamp ring 53 to secure the turret against further turning.

Rotation of shaft 39 is stopped by the trip mechanism I6, previously described, which effects disengagement of clutch l5 upon completionof the rotation required to effect locking and clamping of the turret l l.

If desired, the shaft It may also be employed to index a stop rod for the turret carriage. For this purpose a rotary stop rod TI is rotatably mounted within bed I parallel to the wayslfl. A series of stops 18 are adjustably carried by the stop rod and circumferentially spaced around the same to provide a separate stop disposed vertically above the rod for each operativeface of the turret l I.

A stop strap 19 is, disposed on carriage 3 to engage the operative stop I8 and prevent further forward movement of the carriage. Preferably the stops 18 are positioned to allow stopping of the carriage feed by the cam control on drum 36, and the stops are only employed for emergency purposes. The feed of carriage 3 being hydraulic, the stops 16 function directly as abutments preventing further feed of the carriage beyond the predetermined point set.

The stop rod 11 is rotated to present successive stops [8 in operative position in correlation to the indexing of the turret II. This is accomplished by the worm gear 86 on vertical shaft 36 meshing with intermediate gear 8| mounted for rotation in housing l4 and which in. turn drives gear 82 on the rear end of the stop rod 11. The gear reduction provided is suchas to effect turning of stop rod 11 through approximately one-sixth of a revolution when turret II is turned the same angular amount.

The invention provides a power indexing mechanism that relieves the carriage drive of load during indexing and efficiently and accurately effects all of the movements required in a short time cycle and a predetermined sequence and correlation.

Various embodiments of the invention may be employed within the scope of the claims.

We claim:

1. In an automatic turret lath having a bed with a headstock at one end and a turret carriage thereon adjacent the other end, a housing at the end of said bed adjacent said carriage, a rotary shaft extending into said housing from the opposite end of the bed, a turret indexing mechanism carried by said turret carriage, drive mechanism disposed in said housing, a splined shaft connecting said drive mechanism to said indexing mechanism, and clutch mechanism in said housing for operating said drive mechanism from said rotary shaft in correlation to the movement of said carriage.

2. In an automatic turret lathe having a bed with a headstock at one end and a turret carriage thereon adjacent the other end, a housing at the end of said bed adjacent said carriage, a rotary shaft extending into said housing from awe -s26 the opposite end. of the bed,v a turret; indexin mechanism carried by said turret carriage, drive mechanism disposed: in said housing and tele scopicailly connected to said indexing mechanism to drive the same, clutch mechanism in said housing for operating said drive mechanism from said rotary shaft, and means automatically onerati-rig": said clutch mechanism in response to the'movement ofsaid turretcarriaget In an automatic turret lathe having abed a headstock at one end and a turret carria'ge thereonadjacent the other end; a housin at the end of said bed adjacent said carriage, rotary shaftextending" into said housingv from the opposite end of the bed; a turret indexin mechanism carried: said turret carriage; drive mechanism disposed in said housing and telescopically connected to said indexing mechanism to drive: the same, clutch mechanism in said housing for operating said drivemechanism from said rotary shaft, a lever in said housing for opiatin'g: said: clutch mechanism in response to' the rearward movement of said carriage to index the turret and an automatic trip for releasin sai'dlever and-opening the clutch upon a predeterminect operation ofsaid drive mechanism sufficient to complete the indexing ofthe turret.

In alathe; a-turret, a bed, a carriage movon said bed and rotatablysupporting said it ret; a locking pin for said turret, a clamp 11in" ton-said: turret; indexing means for said 1: including substantially vertical stub ts supported in said carriage for operating s" d locking pin; clamp ring and indexing means, a ousingat the end of said bed adjacent said damage, a singlesubstantially horizontal indexing shaft extending" into said: carriage from said Housing: and: carrying" longitudinally: spaced gears for operating said stub shafts, clutch and drive supported in said housing to operate said in gs'liaift and means operated by movemm of said carriage to" operate said" clutch in correlation:- to" the operatingc'yolc of: said car'- raga V 5 Ifi a -lathe; aturrefia bed, a carriaghmov '2701 on s'aid b'ed and rotatably supporting said turret} alookin'g pin for said turret, a clamp ring for said turret, indexin means for Said tu t including Stub shafts" suppor-ted in said ca age-rot operating said locking pin, clamp ring" and turret, a single indexing shaft extendinginto said carriage to operate said stub shafts, clutch and drive means supported on said-fled to' operate said indexing shaft, means operated inresponse to movement of saidcarriage to 9g;- erate sai'dclutch in correlation to; the opera-ting cycle ofsaid carriage; and variable rotary stop means operated bythe drive means to regulate predetermined cyclic movement of said carriage.

6. In a lathe,- a turret, a bed, a carriage mov} able onsaid bed and rotatably supporting: said turret, a locking pin for said turret; a clainp ring for saidturret, a Geneva movementdis posed beneath the turret to rotate the same; to its severalin'dexed positions, apair of--substanmany vertical stub shafts in said; carriage; eccentricscarried by said stub shaftsto respectively operate said clamp rin and Geneva movement, a cam carried by the stub shaft; for said Geneva; movement tooperate saidlqckin pina: single: substantially horizontal indexing shaft extending into said carriage and carry ing/ longitudinally spaced gears tooperatesaid stub shafts; clutch and drive means supported on saidbed to operat saidindexing shaft, and means operated in response' to movementof said carriage to operate said clutch in eorrelati-on' to the opera-ting cycle: of said: carriage;

GHARLES" H; i J OHN SGN.

asset-smegonea inthe file of" this patent nNITEn sT'AsE's PATENTS Number Name fiate.

wages Richards Apr: 25; 1893 707,32 I lormby s Aug. 19, 1 902 eel-nae Rotter et al. 9, 159111 imse Better et a1. seen. 39,1913 1,099,308 Millholland une of, 1314 a gees Chapman Feb. 19; i924 1,813,4 9 Qlass ury" 7, 193-1 l,9 -3 4;,3 Kylin Ndvlfi', 1933 1 9611 522 lienninger amiss; I934 1 938 675 r ssk Jan. 2 2, i935 aoi lase Igi'n sb'ur Aug; 13; 1935 arises; s eam 8, 19538 235 2593; qodfriaux s'ept; is, 11944 a sazzs; Qasella et all Jan; 19 46 2,395,696 Sundt Feb; 2*6, 1"9 16

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