US950766A - Gear-generating machine. - Google Patents

Description

J. E. GLEASON.

' GEAR GENERATING MACHINE.

APPLICATION FILED JAIM, 1907.

Pa'iented Mar. 1, 1910.

11 BKEBTS 8REET 1,

avwantoz GL 'ASQN, GEAR GENERATING MACHINE.

. APP LIOATION'I'ILED JANJfi. 1907. 950,766.

Patented Mar. 1,1910.

11 SHEETS-SHEET 2.

J. E. GLEASON. GEAR GENERATING MACHINE. APPLICATION FILED JARS. 1907.

@atanted Mar. 1, N10.

11 SHEETS-83321 3.

Wi mince:

' Patented Mar. 1, 1910.

11 SHEETSSHBET 4.

J. E. GLEASON. GEAR GENERATING MACHINE APPLICATION FILED JAN. 5. 1907.

Patented Mar. 1,1916

11 SHEETS-SHEET 5.

SJ" ucufor,

QVi human J. E. GLEASQN. GEAR GENERATINR MACHINE. APPLICATION FILED JAN. 5, 1907.

Patented Mar. 1, 1910.

11 SHEETS-SHEET T.

"/9 n W f m m 7 m v y 1 a q mm'smnmg llllllllllm urmpu lon rlnnnums. 1901'. 0,766-

J. B. GLEASON. 4 QEKR GENERATING momma.

I Patented Mar. 1, 1910.

11 sums-sums.

' J. E. GLEASON.

- GEAR GENERATING MACHINE.

urnoumn IILED JAN. 5. 1907.

Patented Mar." 1, 1 9 10 11 SHEETS-SHEET 9.

J. E. GLEASON. GEAR GENERATING MACHINE.

APPLICATION FILED JAN. 5. 1907. 950 766, Patented Mar. 1, .1910.

11 SHBBTS-SHEET 10.

I fig. 167

r 9 %0 .128 ag/3 o 0 p126 F7916. C i

mm 165 128 line Saw/M1 014 J. E. GLEASON. GEAR GENERATING MACHINE. APPLICATION FILED-JAN. 5. 1907.

med Mar.1,19'10.

11 sums-51mm: 11.

xiv

rag a.- 51 as g/// /////y/ /7 devices for indexing the gear blank and for' ments of the Jain-.8. E.

to the accompanying drawings, forming a part of the specification. and .to the referencenumerals marked thereon.

My'present invention relates to improvements in machines for generating the curves or Working faces of gear teeth on the. rinciples of evolution, and the object 0 the Qpresent invention is to provide a machine which is universally ad uStable 1n order to accommodate bevel gears having pitch cones of varying angles, and where nmterchangeabledevices maybe readily applied to the machine which correspond to the angle of 'the. pitch cone of the gear,v and employing means for simultaneously operating the blank and the tools to generate the curves .of the gear teeth thereon on the rolling principle, and furthermore to provide improved effecting the'various adjustments and movearts, to carry the invention into efl'ect,"ancl to these and other ends. the invention consists in certain improvements and combinations-of parts, all as will be hereinafter more fully explained, the novel features being pointed out in the claimsat .the end of the specification.

-In the drawlngsz Figure 1 1s a plan new of. a machine constructed in accordance with my present invention and adapted for generating bevel gears. Fig. 2 is a vertical'section on the hue -2+2 of Fig. l showlng the guidesand their cooperating parts 'on all enlarged scale. Fig. 3 represents a horizontal section on the line- 3 of Fig. 2.

"Fight represents a vertical section on the line' 4+4 of Fig. '1. tion of a machine. looking from the left in Fig. 1. Fig. 6 represents ,ajvertical' section; on the line 6+6 of Figjl showing the means for imparting thegei'ierating movements to Fig.5 is an end elevathetool' and gear blank; -Fig. 7 represents a horizontal sectioi'i on the line 77- of. Fig-.-

Gshowing the tool 'feedingdevices; Fig. 8 is a'view of the devices for feedlng'and swinging the tool as viewed from the right of: Fig. 9 represents a vertical section.

Fig. --7.

= -mcnrsran, NEWYOBK, A CORPORATION or NEW roam Specification of Letters meant. P te nf fif." "Application fi1ed J ani 1ary5 ,190.7. Serial-No. 351,014. Y

-01; the line sear-Fig.7, FigfiO r sents a section on the line 10- 1 "tof Fi 14. 14 or Fig. 7.

crimson; o1? ROCHESTER, "NEW-roux, ASSIGNOR To GLEAso'N:

feEAree NERa-rmer MACHINE.

[7. Fig. 11 represents a section onftlie lint! 1l l1 of Fig. 7 showing the'act-uatin ""devices for setting the indexing'niechanism into operation. Fig. 12' is asectional"'view ,on the line 12 12 of Fig. 10 showing the cam for operating the indexing, actuating devices; Fig. 13 represents a ldngitiidinal Section through'the gear bl'ank aii' i t r the indexin mechanis m manganese-(1etached there rom. Fig. 14 represents a vertical section through thema'chineon the line I Fig. 115 'is a, detail view of one of the tool holdersr'emoved froin its guide. Fig. 16 is a plan "view of one ofthe tool holders with the top plate ie'n'iov'ed. Fig. 17 represents a transverse section of the tool holder on the line 17- j-l7of Figplti. Fig. 18 is a detail view of one of thefrictioir' devices for automatically swinging he tool clear of the work on the reti'irn strdke. Fig.

19 is an end elevation ofthe machine looking from the right of Fig. 1, Fig.2Q represents 7 a. vertical section on t-he -line. 20,2

1 showing the indexing devices. Fig. 21 is a sectional view through thegearsconiliecting the indexing devices with their. diiving shaft. Fig. 22 represents a transverse section of a portion of the machine on the .line 22*22 of Fig. 1. Fig. 23repres'entsavertical section through a portion of the'jindexing mechanism on the line 23 23 of ljig'. 1. Figs. '24 and 25 represent section's oirfthe lines Qt-24 and 25-25 respectivel .ofFig.

'23 and showing the devices forcontrolling the operation of the index mechanism. Fig.

26 is a view of the indexing.-mechanism in side elevation. Fig. 27 represents a section on the line 27-27 of Fig. 26,'and"F1g. 28

is a sectional view of a portion of the segmental gear supporting arm, v and oneof the interchangeable gears show ng means; 'for Jsecuring these parts in cooperative relation.

and Fig. 29 represents a layoutof the f eed cam.

, v Similar reference numerals in tlieseveral figures indicate similar parts. The object of the present invention is to provide a machine especially .;adap'ted for generating the curves or vorking faces of bevel gears having pitchcones of difiei'entangles, and it operates on the principle of a tooth of a crown gear cooperating with a bevel gear having a pitch surface corre sponding substantially \viththat of the gear to be generated, the working faces of the tools in the 1')resen-t-instance correspondingto the opposing faces of two adjacent teeth of the crown gear, and operating to cut away the metal of the blank on cnrvesor hnesdetermined according to the movements of the tools While the latter and the pitch surface of the gear blankaremoving atthe same .Ve-

locity. The generating movements of the tools and gear. blank are controlled and no portioned in the present instance by a pair of cooperating gear members, one of the m; here being attached tothe' tool. support and being in the form of a crown gear, and the other gear member being operative'ly connected to the gear blank and having a. pitch I cone correspondlngm angle to that-"of the gear to' be generated, a'set of gear members of varying cone angles being adapted to be interchangeably fitted so that the machine may be set to generate cones of various angles. I

The present I invention provides improved means for mounting" these' interch.angeable gears, and'for Connecting the. tool and'gear supports to eifect the generating movements thereof, and also to provide improved operating mechanism for the tools vhereby the strains duringthe cutting operations Will be so balanced that a smooth and even cut may be obtained and excessive Wear andbreakage of the machine is avoided.

The present invention also provides improved means for effecting the generat ng movement of the tooland gear blank,"and also embodies an improved indexing mechanism of the type shown and described in my Patent No. 84t2,'el-55, dated JanuaryQQth,

1907. I The generating machine shown in the present instance comprises generally a suitable bed 1, having a turret Qrotatablysup ported on the vertical journal?) toward one end of the machineand adapted to support the" operating tools and havinghorizontal' ways I extending radially of the aXis of-the turreton which is adj nstably. supported a gear carrier t. i The tools are carried by thetnrret and snitablemeansare employed for driving these tools at all positions' of adjustn'ient of the turret on its axis, a verticalsha'ft 15 being journaled, in the present instance, in the axis of the turretand connected by the bevel gears hand 6, to the main driving shaft 7, the latter extending horizontally through the bed of the machine. and 1s 1on1- naled 1n bearings l irotatably journaled therein andiihaving gears having pitch a key" cooperatingwith the 'lieyed' portion of the shaft to provide a driving connection hetwee these parts to permitrelative longitudinal movement ofthe gear support relatively to this side shaft. T he gear support '18 adplstable 1n the direction of the axis of the gear blank, and it is held firmly in position onits-"n'ays by means: of a bracket-1G havingn threaded portion adapted to (-053 erate with an adjusting screw 17,1110 latter being 3ournaled 1n the bed at 18 and extend-- in'g'a sufficient distance to permit the. a pplicationof a handle.: r crank by means of \\'h1ch the screwniay be turned to adjust the distance of the gear blank relativehvto the operatingtools, so that the machine nay' ae-i' commod'ate gears of various diamet s apair of'bearin'g standards 19 and 20 hav ing a s'leeve12l journaled therein, the latte being provided with a' radial arm 22, 11 serves to support the ndexing meehanisn andiwithin thesleeve is-fitted'a hollow shaft The gear blank supportis' provided with 23 having aiworm wheel 2% mounted'to mm ti iere vithfand" cooperate ivith a worm 2 (see F 1g. 20),,t-h11s Worm being mounted; in

,bearings and 27 on the bracket and the latter is'fixed to the arm 22 for support" ing the indexing 'mechanism, so that.

worm fantl' w'vorm Wheel, when operated, serve to rotate the shaft23 relatively to the sleeve and tinder normal conditions they. pro ride a posltivelock for holding-this shaft and sleeve in fixed, relation. "A tapered center 29 1s fitted into the eiid of the shaft op posite to that-carrying the wornrwheel, and the threaded bolt 30 passing through: the

axis of the gear blank, and d1', a-wnnp the tightening rod '31, serves to lock the gear blank firmly to-the shaft. as sh'oWnimist thewrorm Wheel. and provided witha not or similar port1on 32 adapted; for the application of a Wrench by means of which this tightening rod nay be rotated tojlock and unlock the gear blank, sleeves or washers 33 0f different lengths being. interposed between this nut and the-"adjacent hat of the shaft to permitjthe insertion of centers of, different: sizes, the gearv blank being locked 105, clearly in Figf l3, the tightening rod ex- 7' tending preferably'tlnongh the shaft beyondbetween this center and thebolt,sOfandljthe H 'taperedl center is locked by means of" its taperedsurfaces firmlyyto the shaft.

-' -.-Indexingt-iizcohamkm.as will behe'rcim after descrrbedgthe sleeve 21carr mg'the ii -1 dexmgimechanisnrnndgtheshafty23 simultaneously-;and in locked; relation ll" ing the. generating movements of thei xi":

blank and the tools'during the formatioi the curves of each gear tooth, and theindex ing of the blank is accom lished b y rotating the:shaft;'ielative1y to t e sleeve; To the v presentinstance the indexing mechanism is snpportcdon' the bracket 28,21 nd the latter is,

as previously stated, bolted to'the radial supporting arm 22 on'the'sleeve 21, and item 1 bodies means tripped automatically to set the indexing devices into operation to. bring the next tooth on theblanlt in operative position relatively to the tools, and'to automatically interrupt the operation of these devices without undue shock, and to securely lock the gear blank during the operation of the tools thereon. This mechanism inthe present instance comprises, generally, a pair of axially alined shaftsbat and 35 mounted, respect ively, in the. bearings36 and 37 rarried b'y the bracltet 28, the shaft 34 carrying a notched stopwheel 38 and the shaft 35 carryinga stop wheel 39; The shaft 35 is adapted to be connected by change gears of any well known form such as the gear-atO on the shaft 85, the gear $1 on the shaftcarrying the worm 25, and intermediate gears such as -12 and l carried on the arm 4% which are adjustable radially of the shaft these gears being of various relative sizes. proportioned according to the number of teeth to be formed on the gear to be generated. The worm is normally locked from rotation by meansof a. detent 45 mounted to with a springoperated plunger 49, the lat ter being mounted in a casing 50 and .pro-

operate vertically in a guide 46 on the bracket 28. and operation of the stop wheel 39 is graduah arrested without shock by means of a latch .t7 pivoted at LS and having an arm thereon arranged to cooperate vided-with a helical spring 51 which normally operateste hold this latch in a position shown in full lines-in Fig. Ql, and to cooperate with a projection 52 on the stop wheel 39 and thereby lock the latter from retrograde 111U\'t111@11t ..2111(l this projection engages this spring-operated latch a moment before the bolt enters its coiiperating notch 45 in the stop wheel. and the resistance offered by this spring-operated latch serves to offer a vielding resistance to the turning movement of the stop wheel, the latter at this tune being disconnected from the driving devices. as will presently appear.

- pair of projections 54 and55 thereon, one in flll ounted' in coiiperative relation with the notched wheel is a 'detent 53,=l1t1V1l1I a p advance of' thc other. and spacedat a disvtance not quite equal to the distance between the notches on its cotiperating stop ,wheel. and aals o having; a .paiii iof fingers 56 thereon adapted to engage the top-wheel at each ide of the projections thereon. these fingers being arranged inadvanc he projection rrevionslv deseribed.; Th1 latch is pi 'otally mounted.onian opera-tin lotto] at, a point F18, WhlClT-dS intermediat of t he'. notch engaging-projections 7:4 and! tilt-he bolt .51 serves to move this' detent into cooperative relation with the stop wheel whiledhe latter is azperating in the direction indicated by ing operation of the machine. the operatlon of the casing will rotate the traction of the bolt 57 will draw the'detem away from the stopivlieel, the fingers iiti'tfii gaging thewheel and serving as fnlcrunis about which the detent pivots while the projection 54 is being disengaged from its cooperating projection or-not'ch on thewhwel by the spring (33.

The bolts 45 and 57 are connected for simultaneous movement by a leveror'rochcr arm 59. the latter being pivoted to a rein-- tively fixed part of the bracket 28 at UO.-2i1l(.l having a suitable connection with the two bolts, gear connections 6,! and (32 being employed for this purpose in the present instance. anda spring (33 normallv operates on the .bolt' 45 to move the latter into engagement with its coiiperating stop 45 of the stop wheel 39, and through the connection 59 between these bolts the bolt 57 will be normally held in retracted position with its de-' tent disengaged from the stop wheel 38. a

The proximate endsof the shafts 3t and are provided with opposed bevel gears it and (i5. and cooperating with these gears are a set of pinions 66, the latter being mounted on a gear frame-or spider 67 having a hub journaled on hearing sleeves 69 and (39 threaded 0n the proximate ends of the two shafts, and 1ournaled on these two shafts and inclosingthe gear mechanism just described. is a casing 70 connected to turn with the gear spider by means of the arms 71 and havinga worm wheel 72 arranged on its periphery, a worm 73 cotiperating with this worm wheel' and serving to impart a continuous rotary movement to the casing dur- Normally.

gear spider 67. causing the pinions thereon to travel about the axis of the shaft. and in so doing they will rotate the stop jwheel 38 fpr the reason that the stop wheel 39 is positively locked by the bolt or stop t,5 at all times excepting during the indexing operation. and consequently the gear (33 on "the corresponding shaft will be stationaryand a planetary movement of the pinions. cog'iper ating with the gear (H on the saaftthat'i unlocked, will cause rotation of tbelatter at doubled speed. ing. operation commences the shaft 33 1mmlocked by reason of the retraction of the bolt +5 from its cooperating notch 45* in the stop .t the moment the'indemwheel 39. and by means of the lever connection 59, the bolt '57 will be simiilta-neously elevated to bring the detent 53 thereon into cooperative relation with the stop wheel 38 to interruptits operation, and thiswillxrc- 1 and have been fully retracted from the gear blank, and this is accomplished in the present instance-by means ofa pivoted arm 74: having its inner end adapted to cooperate with the lower end of the bolt 57 to lift the latter. and this arm is arranged j-to be operated by means of a. crank or cam 75, as

shown in Fig. 19, the latter being mounted I on an operatingshaft Y76 and having a keyed connection therewith to insure operation of the cam when this shaft is rotated,'and.to permit relative longitudinal movement be tween the cam and the Sl'ld ft when the gear support is shifted on the bed of the ma. chine. This shaft is suitably in ounted in the bed of the machine and provided with agear T7 cooperating with a. similar gear 78 arranged on a pivoted crank 7 9, theelatter'being provided with an operating rod 80 which is adapted to be reciprocated by-a suitably timed cam, that will be hereinafter described, to automatically control. the operation of the indexing mechanism.

The worm 73 for operating the indexing inechauism isniount-ed on a shaft-:81, and

the latter in turn is jonrnaled inla ,bearing 82 forming a part of the bracket 28,, and this shaft is provided with, a pinion 83 arranged to coiiperate with a pinion 8% ona shaft 85, the latterbeing journal'ed at one end: in a hearing bracket '86 having a.-bearing vportion ST mounted to swing about the axis of the shaft 81. so that the angular relation of the shafts 81 and 85 may be altcredwithont disturl'iing the coiiperative relation of the gears connecting them The lower end of the shaft 85 is jonrnaled in a similarbearing braclnt 88 which is mounted; to swing about the side shaft 11, and theshaft 35 is con-- nected to the pinion 14} on the latter [by means of a pinion 89 whichis fixedthereto.

In order to permit the indexingmechanism to swing about the shaft 23 as an axis during the generating movement, the shaft 85 isc-omposed of two telescopic sections that will permit lengthening and shortening'of the shaft and having a key 90 to provide :1 driving commot on between them, andsuch a connection will maintain an o1j crative driving connection between the side shaftand the indexing,mechanism, although the worm shaft 81 alters lts'position about the shaft 23 as an axis, and such a conncction-- avoids the necessity of employing clutchesor other power connecting and disconnecting devices, as would otherwise be necessary. The shaft for theworn125 is preferably provided with clutch members 91 ,and'92 for enabling this [shaft to be disconnected from the indexing mechanism, and thus enable it to be rotated by means of a crank or other wrench to bring the gear blank, when the latter has been roughed, out into register with the operating too1s ,.withont the necessity {of disturbing the change gears, the

threaded handle 93 serving to control the connections between these clutch members.

I, Operating toolsr The operating tools are supported on. the turret,as previously de- 4 scribed,, and inthe present instance a pair of tools is shown Whichare arranged to 0pcrate to simultaneously form both faces of a gear tooth, and the arrangementof these tools in the present embodiment is such that a balance is effected between the two tools to sustain and neutralize the thrust of the tools during the .operationaswell as during strains on the parts, and enables the gener- -ard.-99 which extends upwardly from the thefgenerating movements, and this is generally preferable as 1t reheves excessive ating lllOVGlIlGl'ltS-tt) be accomplished at the expenditure of less power.

on a pair of tool guides 94 and 95', provided with the bearing lugs 96 and 97 respectively, by means of which they are mounted to-turn abouta common axis 98, the latter in the present instance being formed of a"bearing sleeve over which these bearing lugs are fitted, and this sleeve isfittedinto a stand- The toolsem-" ployed 1n the-present lllStil-DCG are ofa' planer type and are mounted to' reciprocate) turret, the sleeve being locked in position by means of the screws or bolts 100 cooperating with the washer 101. The tool guides are ]'n'ovided with tool holders which are duplicates mounted in reverse arrangement,

and -a description ofone of these tool holders and its tool guide, will suffice for both. Each tool holder embodies aguiding por tion 102 formed) to fitand reciprocate longitudinally in a guiding slot 108 in the tool guide, and to the-under side of this guiding portion is fastened a T -shaped block 104, adapted to fit into a 'T-shaped slot formed ina rack] bar 105,'the rack bars of thetwo 'tool holders, being arranged to cooperate at oppositesides with an actuating.

pinion 106, mounted on an operating shaft 107', journ'aled 1n the 'bearlng sleeve 98 and having an operating pinion 109 on 1t's outer end and "provided with a cotiperating rack 110. Each rack" bar is firmly'lock'ed to its "corresponding toofh olde'rfby means of a headed bolt 111, the latter extending ews I through the guiding portionof the tool I and asilth ese ends .are'ispreadlagainstithese holder, and through the top plate 112 which. is bolted to the. guiding .portion;and rests on the-upper surface of the-tool guide, an adjustable wedge plate. 113 .being interposed between this top plate and the guiding pop.

sate for Wear.

tion of the tool holder in order to compen- The rack securing bolt 111 extends through a sleeve 114;, the locking nut at the upper end of this bolt engaging the upper end of the sleeve, while its lower end clamps against. the rack bar, serrations being preferably provided on these parts at 115 to insure apositive locking action that will prevent shifting of the rack bar after it has been adjusted. These radlr bars of the respective tools are SO SQiZ'lIi relation to" the that when the latter is rotated to the l mit of 1ts movement in each direction; the tools will be in readiness to perform the cutting operation on the tool moving from op osite sides and in opposite directions.

' "he guiding portion of each tool holder has a ort-ion 116 extending to the forward face 0 the tool guide, and in close proximity to the plane of operation of thetools, and itis provided with a tool clamping bolt 317, having a yoked portion 118 extending into a clapper block 11.9 which is'closely fitted to the underside of the guiding portion 102 of the tool holder and" the yoked portion. of this belt serves to draw the jaws 120. together and clamp the operating tool 121. A pivot bolt '11? serves as a center about which the clapper block turns, the latter being provided with ashoulder portion 122 adapted to cooperate with an'abutment 123- of the tool'liolder when the latter is operating in; one direct-ionic hold the tool in cutting position, and being provided with a beveled portion 12% which permits a pivotal movement of the clapper block that will enable the tool to cl'earthe work on the returning or. non-working stroke.- In order to avoid dulling of the tool, it is preferable that this pir ot'al movementof the tool should be accomplished automatically otherwise than by the engagement of the tool with the Work, as has been the practice here tofore, and a device for accomplishing this result is shown in Figs. 16 and18 embodying generally a f-riction'r'ail 125 attached to each tool guide at 126V and the clapper block 119 has a housing 126 pivoially attached thereto by the pivot 127, this, housing being fitted to reciprocate longitudinally on the friction rail as the tool is reciprocated.

Within this housing are fitted friction plates 12S'adapted to bear on opposite sides of the friction rail 125 and a yielding pressure between these friction platesandfthe friction. rail is produced bynieanszof asst screw 129 operating on a laterally-curved spring 130 having' 'it'send arranged to cooperate with beveled surfaces 131 of the housing,

this crank shaft and ur e f r i fd dr he meshing with a cee femt-ias "P friction platesandwill thus; compress them against the fr1ction.rail The friction, of

course, is present on :botl the feedgand reholder begins its feeding :stroke this friction device will operatebnt-he'clappr block 1 to turn the tool about-the vpivot-bolt-dl'f and thus bring it into-operative positiom and after the? completionof the feed stroke, and at the beginning of the return stroke, this friction device. serves to turn the ,iolapper block in a reverse :direictionand thus move the tool. clear of the work,,so-that dulling of the tool is'thereby prevented; i{

The tool guidesiare adjustable, of course, to enable the tools to operate lini. paths corresponding to the root angle of -the gear teeth to be generated;mile-adjustment, of

course, occurring aboutwthercommon. axis so that the tools at all times will'worktoward the apex of the gear blank; andzinft'order to facilitate: the adjustmentof these guides and to look them in adjusted;angulararelation, a screw- 132 is attached to-theinner side of each tool guide, and '--these screws @are con- [nested by a turn 'buckle5133 Which .-serves as a rigid connecting device; betwcenthe tool uides, .and also, serves to: shift these-guides into the desired angular relation; The ends of the tool guides farthest separated vare.- also fitted to a segmental connecting-member 134, and they are locked theretoby.ineanstof the bolts 135; while the 'narrow 'ends of-the tool guides are'connected byu-it similar segmental member 136 having bolts 137 for locking the tool guides'in ifixed relation. The segmental n1ember-136-is provided with-a guiding-rib 1138 arranged to cooperate ewith a concentrically-formed guide 1139 which constitutes a rigid portion-of.the turret, land the. cooperative relation-between this gulde and the member 13.6 serves toinsureoperation of the tools in a igiv'en planem;

The tool-operating devices shown-in the present instance embody a crankillO mounted'on a shaft 141, and "tlielatter 111 "turn is journaled in bearings lfi for ned on a partof the turret, a 13 'beinglfixed to n lshingwithf a ring gear 14161 journale'd' on "a=' '-portion nof the standard 99 as a 'center,* and cooperating with thisring gear 'is 'a pii'iionrldo fixed to I a shaft 146, theTa-tten inturn being provided with operates with. a shaft 149,1 ;11.

P1111011 'f14j7-g which 00- ion 148611 the horizontal at e'i beih i-rn-al'ed in the vel gear 150 nion or gear 151 mi theverti al sing: 152 11 mounted on an of the turret.

The crank 140 connectsdirectly with the 1. latter being axis ei incident wetzae rack 110,the latter being held in cooperativerelation with the pinion 109 by means of the housing 153 which is rotatable on the shaft 107, and in order to enable the throw of the tools to be adjusted,.the crank is. pro- Vided Witha radial slot 154 to receivethe crank pin- 155, the latter being'shifted in this slot by meansof an adjusting screw 156,

and this crank pin is attached to the rack by means of the bearing sleeve 157 and the nut 158, continuous rotation of the crank in one direction obviously continuing to turn the rack 107 alternately in'reverse directions, and the pinion 106 .coeperating with the racks on the respective tool holder in like manner, serving to reciprocate the latter in reverse direction.

Generating mechanism.-The segmental member 134, which is locked to the widened ends 'of the tool guides, is provided with a rib l59concentric with the axis of the turret and arranged in a plane parallel to the plane of movement thereof, and this rib is fitted.

into a correspondingly-grooved portion of the bracket l60,' the {latter being movable relatively to the too]. guides and about. the

axis of the turret as a center for the purpose of permitting the feeding and retracting -movement of the tools without disengaging the chan e gears, and it is held in operative position by a rest 262 guided in a slot 263 in the bed to permit adjustment of the rest corresponding to that of the turret, suitable means being employed for locking the rest in adjusted position. The bracket 160 is provided with a gear segment 162 which forms asection of a crown ear havin the axis of adjustment of the tool guides as a center, and this gear segment of the gear sector is adapted to coiiperate with another gear sector having a p tch cone correspondmg in angle to the pitch cone of-the gear to be generated, and being operatively connected' to the gear blank. In the present instance these gear sectors last mentioned are interchangeably fitted to a segmental arm 163, the latter having a groove 16%- formed at'its inner circumference, and con-- centric with the axis of rotation of the tur ret, the ends of this arm being pivoted to turn about the axis of the gear blank; that is to say, one end is'supported by a bearing 165 on an ar1n'166 extending upwardly from the left end of the machine as seen in Fig.

and its opposite end is fitted over the sleeve 21 which is concentric with the axis of the ear blank. as shown in Fi 22 the sleeve 21 having a key or rib 167 adapted to co- .operate with a corresponding key seat in the end of this 'armandbeing split to enable it to be compressed and clamped rlsndlv 011 this sleeve by means of the bolt 168, Ring 169 on the segmental arm being provided to co operate with a bracket 1T0, rigidly secured to the bed of the machine for the purpose of between the ing locked or secured holding this end oi the segnn-ntal arm against longitudinal movement on the sleeve 21.

. From the above-description it will be on derstood that the arm 163' carrying the a propriate gearsector 1 71 coiiperating with the sector 1.62 forms an operative' connection gear blank and the operating tools that will serve \vlient.'he.- arm-163 swung on its axis to insure an equal motion of the operating tools in their respective plane ofoperation, and l'he pitch Surface ofthe gear blankso that these tools will generate the curve of the teeth according to the trueprinciple, and in each instance the gear sector 171 will have its pitch Surface forming a part of the pitch surface of the particular gear to be geueratmh or approximately so. These interchangeable gcarscc tors may be fitted to the arm 163 in any de sired manner, the tightening means :being shown in the presentinstance wherein each gear sector is provided with a rib, 1753 adapt-- ed to lit the correspondingly formed groove 164 of the segmental arm and having an aperture-or slot 173 to receive a locking or clamping belt 174, the latter passing through apertures or sleeves in the min 1133' :uzd he by a nutoi; other suit ablemeans. v

The generating movement-isimparted to the arm ltiii .in the. presentinstance by a pita a L 5) man 175 pivotally attached at its upper end by a bracket 176 on" the segmental armand having its lower end connected to a crank pm 177, the latter being ad ustably mounted in a radia slot 178 formed in acrank 1T5) an adjusting screw 'being'preterably our ployed for shifting the position of' this pin 177, and therebyvarying the travel of the segmental narm, whilethe crank swing: through a fixedangle. This crankv pivoted to the bed at 191 and it 18 provided with a pin or projection 192 arranged to cooperate with an actuating cam 193, the lather being loosely fitted on'ahub 194.,- and this hub being fixed to an operatlngsluit'l'.

' 195, the hub and cam being operatircl c com vnccted, under normal conditionsby means of a bolt 1.96 fitted to operate radially in a portion of the cam and arranged to co'iperate with a recess or notch 197 in the herb.

" sees 7, the cm 193 rotating e a-l s with the shaft 195 andhavhig its periphery a e-'- propriaitely laid out so "tossing the arm '179 alternately doWi1Wezdty,'-thence Lipwardiy and finaiiy stinging it to rest-nor v many in the position shown'iiyFiglti, the

bet weeh the periods Wheat the; arts are swinging t generatethe Curve 0 the gem?- teeth, is preferably operated fxfonTthe'shaft fereiit angles thee 195 also, and this mechaiiism in the-present instance embodies a cam EZO LfiX'ed to rotate with the shaft and provided with a camgroo've 20:5 adapted to cooperate with roller or projection 2G5 ne1 e-1ever 20?; the latter being pivoted. "on the hearing bracket 208 meningeson a relatively fixed partofthe bed, and "provided with a'lfadi'ai groove or siot 209 zulapteti. to 'i'eceivea cross I head 210,'a1 "adjusting screw Q'llheixigp'tefenably provided for afi usting th'e 'posltion of the cross head in the slot 209; thibistosay, in a direction .i'iadiail'y of t heexisot movement of the leveiyen dthis crosshead. is provided with a'piI- Iot Z-WZ havh gai bioeit 21,3 pivo'ta'l'iymounted thereon, andthis block in tu'rnis titted toopeitate in a groove 21% formed in ah racizet 'igidty secured to the tlnrt,ilii slot 21% extending radial-1y of the axis of thetm-ret: As-the cam 20% rotates, it will 'tur'n the i'ever-QOY- ahout its axis. and by means ot the cross head a-mi the operating hi'oek" just tie in the groove 214, it" will. serve to swing the carrier through-an arc-sufiicient to feed the tools to thedepth of th *eth and to retract them 'to clear the" teeth}- indexing of. the blank occurring" whiie'the tools are retract-f ed. In order to tam" it-ate the adjustment ofthe tool support" operatein a plane (0 nthng-to the diff s to lie-generated,

itis preferable to p'iOi'M :1 suitable adjustil -"ingdevice, the device shown in the present I yet,- and *seryin stoi tocl fix-ed felatroiv to .the

1 v 2 i i vious thatnthe-turre will;

instance embodying a pinion-215 arranged; to eoiiP'eratewith a Concentric geaisegnieut- 1 916 formed on a pa t "01"" the torret as shown "fifi Fig. *5; the pinion hein' shaft 217 adapted w'tol rec e ,hgcrank, 01. rich; to enable it: to Lhewieadiiy tor ed; after the locking bolts-21% have been: 1 95 siot 219 formed inthe pelipherbracket remains an ton i. w l be this bracket remains: stationary, T a fiet ate1f s eiheth operating at the tools with rovided with a;

me whee the'tui-ret has hees tflfosfght tothjjmo er adjustment vof "the" we? feeding d eyieem indexing mechanism isopez'ateti eiit nstance by means i. pert whaelitums projection 219 fixed in the hub 20f thewbrm n'h'ee'l' 20Qe and tai i'a-ngedT5 trip the ape-W1 -220,the' hitter being'rmonnted on a shaiti 221 journaiedjgin the bearing-222 and provided eeeive position reiativepto tools. v ifipemtio'n-of time maci z'in represents aiayout of the feed. ca-m 2Q-f=,b eg1n- =30 and the tighteningiiieiiibei'iigl as shown in Fig. 13,, and the screw: 17 is jogereted to shift the gear sup'port {towi g t1 cone is coincident with thfiei' the turret; The tools ma proper cooperativ e relati t'gv'i'thftheabla ik fatter loosening the bolts 218' (see Figs. "5. 18 and 9)., and ltherif tui'ning'ft'he the turret sei'w i'ng' lattei 'st'atio iary "relat tool feeddeviees; 'aild th 1: he t 1$ is adjusted ,h ,boltl lll '(Fig. '2 ion ttigiiml 'fadji stfnelit itch taek bar 'hilet'he throwo f' the ools friziy he-ai 3 ,dby ems ofthescrew 156- ifij3), which sei'ves, to; shiftthe position of the in 'the 'clampustin'ent is 'efieeteti "without "thistuehmg he a v -The rod SO -"shriek serveste eontroi the 3 bias until the next tooiqis brought into-o1 .ning at. the point wherethetools-,a1'e feds :turnwith the'shaft23; (means of the bolt shaft .217;

controls the fi-"the' geralik hind width-the shaft 195 this peitembodyihg a I with a crank having a. pin-iconi'iecting it;

116 blank into a position whereftheapex of its 31s of "the Til-61', 1

11111311 he tools arejbijought to thefilroper' @154 y Y- I, i" e e -wlth, the breeket, 2-1" hoid the thereby vary the travel ofthe rack 110 which serves to operate the shaft 107 carrying-the pinion 106, the latter cooperating with the racks on the tool holder. The travel of the tools and the blank during the generating movements may be varied by operation of the screw 190 (Fig. 6 as this serves to shift the crank pin 17"? of the arm 175 radially relatirel to the pivot pin 1910f the arm 179. The number of teeth to be formed on the gear may be varied according to the proportions of the change gears 40, 41, 4-2 and i3 and which are interposed'be tween the worm shaft carrying. the. worm 25, and the shaft 35, the operation of the latter being controlled by the stop mechanism, and in cases where the blanks have been previously roughed out, the teeth thereon may be brought into register with the tools by loosening the handle 93 (see Fig. 27), and' turning the' shaft. carrying the worm 25, as the latter cooperates directly with the worm wheel 24, and this wheel serves to 1'0- tate the gear blank relatively to the sleeve 31 (see Fig. 13.). v

The main driving shaft 7 operates continuously', and it drives through the gearing shown; the i'ertical shaft 152 and the horizontal e-shaft 149 (Fig. 4), the pinions' 14-7 and 1 18 between the latter shaft and-themtermediate shaft- 146, and the pinion 1-15 on the latter serving to rotatethe ring gear 144 (Fig. 3),.the latter cooperating with the gear 143 on the crank shaft 141 serves to operate the crank thereon imparting a reciprocating movement to the rack 110, and

' sideshaft 11, the latter operating the telescoping shaft 85 through the gear and connection shown, and the latter serving to rotate the worm shaft .81 continuously, a continuous motion being thus transmitted to. the casing 70, but under normal conditions the parts will occupy the positions shown in Fig. 23, the bolt cooperating \Vlllh the notch 45 in the stop wheel 39 toprevent rotation of the shaft 35, and thus lock the gear blank from rotation, while thebolt 57 will ocupy such a position that the detent 53' thereon will restclearof the wheel 33, per; mitting free rotation of the latter. The

' feed cam204 and the cam 193 which imparts thegencrating movements to the-tools and "ing the generating movement. The

mental arm 163 swings about the axis of fected, the first step in the cycle of operations is produced, by the cam 20%, which operating on the projections or rollers 206 and 206, will swing the lever 207 about its hearing or center 208, and through he cross head 210 and block 213, this swinging movement of the lever will be transmitted to the bracket 215, which locked to the turret.

the movement being'in a directionto feed the tools into the blank to the full depth. of the tool. At thispoint the feeding movement ceases and the'cam 1.93 will be in a position to operate the arm 179 about its center 191, swinging it first upwardly from the central position shown in Fig. 6 until the tools have cleared the toothon the blank, thence downwardly to a corresponding position, and finally returning it to the central position asshown in Fig. 6, a concentric portion of the cam 193 serving to support the arm in this position at all. times except dursee;-

the gear blank, as previously stated, and at the same speed therewith, the arm 175 fornr ing a'connection ,between it and the cam; operated arm 179, and through the change gear 171 thereon and the gear sector 162, a corresponding swinging movement is ill!- parted to the tool guides, the latter swinging in a given plane about their common axis 98, and as the pitch surfaces of the gear teeth on the sectors 162 and 171 correspond to the pitch surface of an imaginary crown gear having a center coincident with that of the tool guides, and the pitch surfaces of the change gear 171 has a pitch cone corresponding to that of the gear to be gen erated, a uniform speed of movement is imparted between the pitch surface of the gear to be formed and the tools, and as the twooperating tools correspond to the opposing faces of two adjacent teeth on thecrown gear, these tools will cutaway the metal on lines-or curves on the principle of a crown gear rolling on the pitch surface of the gear blank, the metal of the blank being removed by the proximate working faces'of the tools and "the tooth being defined by the metal untouched between these oppositefaces of the tools after the feeding and generating movenients havebeen performed.

After the arn'1179 has returned to its central position as shown in Fig. 6, that is to say, after" the completion of the generating 1 and i sj thelzit-ieris lifted: it will engage the i thebmp etion' (seine cycle o ielifi n 3P v v Q 5 this sto yvhe i fbefore the eeeyee movement and after the tools have been re by the locking bolt or stop, so that the tracted he projeetion Will en age the ihe l'zi tferris' elevated, and before he detentthereonten'gages the'st'op wheel 38, {he 1, r cooperating with the bolt i5, will gri'fe' r enecr the bitter from its oooperating notch 45*111 the stop wheel 39', suffic enrly. ,tojper nitihe well'of the notch to engage T llie bevel this I boltto throw it downwardly in posirion tol the spring 63. This mygi l l release stop wheel 39 and a monrenti leber,'u il l caus'ejthe rear projection -55;on th,e jdei i'it 53 toengage one of ,the projectionso e tl e'stopwhee1-38, the impetus of tlielaf tere ,iieii'ig the latchio tilt on its axis .58, carrying ih 'e f orwardj )roject ion 54 25 thereon into engageini ht with the next adjeii cenlgfjtoot hjon the slop-(wheel, and nt the same time-the finge all l ll rest in engagementther ewith Theoiie iifioiijjust described mlo'cksthe shaftnndloqks t -hje shaft 34, the' '30" bevel gear- =6 on; the; letter being new; in

ing ithr vit given phii etary novementgfroni the .cont i nuously rotating casing' 70,'=.'andasfthe berelcgeer 6.5 on the sheft'35 3,5, at"thisfit inre is fr, ljlogro'f-zi te, these piniens lwill aime-operation;of] the shaft 35, and through 5 the; ehenge gears, movement .will be "impiirted to .th'e WOl'lll 25 and its-coop v eratin'g worm u lieel'fil Theindexing nieclr 40 anisn'i,-iis.previously elated, is fixed to {in arm "22;;onmthe sleeve 21, the 'lat'ter being workg 'supports, "and while the norm wheel 24j' 'aind its:eo6pernting u oi'in l5n0rinelly form in-(11mm retaining the gear (blank,- 4 s rotatable 'n' ithvihe shaft 23, and 'the sl'eeye- QlQ-"infiXed el riiionhduringthe generetiiigi movemen )perzitijo-nfof this Worm wheel; 5 nd"6pera1tingWei-in;willcserx e to. alter the the teefth on the lola-nl being:brought into operzitii e" jositionirelzitively 60.; the isms a fter thereonj'. "Thev notch 45% infthe shop. 3 9, ivlieii it" ree n's to e: osition opposite to 'the bolt "4"; erniih i the latteri to eng-Lige the-xa ction of th e spring 63 I lofthe, stopilwheel Vivill be 1e in'oinentihe; tooth is prophtrd' ioi: index ed zandihe projection Q52 '0 the st'ovp 'Wheeli:engegi11g, the; spring- I i Jleiei' "4i7j'seri es ito ret ardlthespeedlof operates to lock, fine, "l

jfeetion on; I offthe detenti Sgi'ffilllgfifi 'f'ulkvzrunis 'to enable the spring (33 m perfornrihis operation un- 3 r. rotatab'l' centering a gear toh therein l SpTlfshock is minimized, and ne this locking bolt I heel. '39, the bolt o l (Will b M n li; ,reirncied by means of the leyer i se boli" ;che bolt z wistedi lliisoon qiletes lhe orcle of operaiions of the index mechanism as the Wheel 38 is free to re'iiolve and ihesiop 'WllQOl 39 is locked so that ibe gear blank is held in fixed relation to the o erating fools during feeding and generating nioveinenis.

f .xI'claiin as my invention 1. In a bevel gear generating inachinef the combination with :a suitable support for :the gear blanhbf apair of tool guides mounted to swing about a common axis and 'having'operating tools thereon adapted to co'ciperaie with the blank to form the teeth thereon, '21 gear segment carried with the tool guidesydevicesfor effecting the adjustment of the gear segmentzand the guides to correspond'to the pitch cone, of the gear to be formed," a' bevel gear segment operatively connected to'the; gear blankto turn therewith :and cooperating with the gear segment conva fined"relation vhile the piniofnsf66(cooperatneeted .to the fool guides, said bevel gear segin'e'nt' having a pitch cone corresponding lto that oft-he gear to be formed, and suitable ineans for imparting swinging movements to the bla-nk and tool guides about their respec- 2. In a bevel gem" generating machine, ihe combinzition with a suit-able support for rotatabl'y oenterin-ge gear blank on its axis, of 'a pair of tool guides mounted to swing about a v c'oinnionaxis, and having tools 7 mounted conneeted-lgy {he segmental arm ifiii with the thereon adapted to cooperate Withthe gear blank a: bracket: Connecting said guides for locking thein in fiXcd-nngulnr relation, a crown gear segmentcarried by said bracket,

deVices for efiecti'n'g'the adjushnent of the gear segn'ient and the guides to correspond generating i lifi j Trig-111T operafiing tool, of a support for blank, an zirni o'pers tiely connected to the gear blank and the crown gear segment, devices for effecting themljustinent o'fihezbevel gear segment on the;'nrni in order i' r erm ii; itto cooperate with the crown gen-r segment andinez ns for hangingthe gear blanknnd tool' guides Y on f t heir respectiven-Xes.

3i in 'ecyinachine for gears; the 'co nbinalion; with a turret nlfiillltt cal. axis, and a tool guide niountedon "e horizonieh axis on the .turr'eb end

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