US1620811A - Work-setting means for gear-generating machines - Google Patents

Description

Mar 15 1927.

ch E. R. F ELL.ows.

woRK SETTING MEANS FORYGEAR GENE-RATNG MACHINES March 15' 1927-- E, R. FELLowS vWORK SETTING MEANS FOR GEAR GENERATING MACHIES ned Jan. 27. 192:5' 'f sheets-sheet 2 lll.

March 1 1,5, 1927.

E. R. FELLOWS WORK SETTING MEANS FOR GEAR GLNmATINGl MACHINES 7 Sheets-Sheet 3 Filed Jan.` 27. 1923 March Y15, 19.27'.

vE. R. Fr:| ows WORK SETTING MEANS FOR GEAR GENERATING MACHINES 7 Sheets-Sheet 4 3 2 9 1 7 2 n a J d March- 15, V1927- E. R. FELLws v WORK SETTING MEANS FOR GEAR GENERAATING MACHINES I Filed Jan.27. 1923 '7 Sheets-Sheet 5 March f15.- 1927.

` 1,620,811 E. R. FlLLows` l WORK SETTING MEANS FOR GEAR GENERATING MACHINES piled Jan. 2v. 1925 '7 Sheets-Sheet New o@ l 1,620, 11 March 15, 192v7. E. R. FEI-LOWS S 8 WORK SETTING MEANS FOR GEAR GENERATING MACHINES Filed Jan. 27. 1925 7 Sheets-Shet '7 c. V.) y

Le ma v' WN tm ma y bg f @www `Patented Mar. 15, 1927. l

EDWIN 14. FELLoW-s; ,0E srmermrd, im'lvmlsfnz Agslflmn mQfmnE-Fnnpows GEAR Same 'tune @eine ah Cil i ce

shown in Figure 10 as seen from the View point of that figure, but representing the parts in a diiferent position.

- Figure 12 is a planview of a partV of the means for initially setting the work.

Figure 13 is a plan of another part of the same means containing a gage on a different partof the machine.

Figure l141- is a section on line 1& 14 of Figure 13.

Figure 15 is a cross section on line 15-15 ofFigure 3, showing a detail of mechanism.

, Like reference characters designate the same partswherever they occur in all the figures.k

The machine here represented is designed for iinishing previously shaped spur gears by a grindingoperation, and is generally,

except for the parts. and features novel with` thel present invention, substantially thesanie as the machine disclosed in my prior application for Letters Patent of the United. States Serial No. 595,304filed October 18,

1922, and entitled Automatic gear generating machine. It also contains many of Y the characteristic features shown in my preceding application for vLetters Patentof the UnitedStates Serial No. 578,288 filed July 29, 1922,v and entitled Gear grinding 'machine. Only so much of the machine as is necessary to an explanation of the present invention is shown and described in this, specification, and for explanation of details not herein shown attention is directed to the said prior applications.

The base l ofthe machine is provided with an inclined guideway 2. on which'is` complemental abutment 11 which Ivcall a former abutment.7 A combination of rotation about its axis and of translation perpendicular to its axis and parallel to the guideway 2 is given to the work` piece,

' whereby the latter is caused to'roll past the grinding wheel, `and the character of the rolling movement of the work is determined by the formofthefaces 9 and 10 of the former and Vabutment, respectively. .The

-former isv removable and interchangeable with others having specifically different .lengths locations, or'forms of the face 9 to be used with specifically diiierent` gear blanks. Normally the abutment is stationary,-having no other motions than the admesh with a rack.

(Fie

effected by turning justinents presently described, and its end face lOhas the relation tothe former 9 of a rack tooth face to that oi acomplemental gear tooth face. Of the grinding Wheel the face 12, iii. a plane perpendicular to its axis, is the part which acts on the work, and its relation to the teeth of the gear blank is that of a rack tooth face at the opposite side of a tooth space from they tooth yto which theabutment 11 corresponds. f

Ai" cani 13 shown in dotted lines in Figure v1,k and also shown in Figure 3, imparts movement to the `work spindle and former through the medium of a'bell crank lever le, a second lever 15, and a rack bar 16. The lever 14 has two arms, one of which carries a roll 17 bearing on the cam 13 ,andy the other arm 18 of which bears on a roll v19` carried by the lever 15.r The rack bar 16 is pivoted to the leverl 15 and A has teeth which mesh with the gear 7. Thus when the ris- 'ing part of the cam passes the roll 17 the ygear 7 and former' 8 are turned in anticlockwise rotation, as seen in Figure 1, and. the pull of the rack `bar combined with the reaction oi the former. against its y, abutment 11 causes the .work carriage ytobe Inoved upward and to the left (Figure 1- `to the right, Figure 2).

The rotary motion given to the work spindle yis that permitted to the former relatively to the abutment; and the compound movement of rotation and translation,.both

fof the former tothe abutment and of the work piece to the grinding wheel, is equivalent to that of a gear wheel rolling in gear blank are generated accuratelyfto a prescribed forni, controlled by the faces of the lformer `and its abutment, .at the same time that they are cut away to required siae by the action of the grinding wheel. Cutting takes place mainly on the upward travel of the work; and at the end of the ldownward travel, Awhich is effected by gravity, with aid from a spring if desired, the work is indexed in order to bring another tooth v into positionv yto be cut on the `next upward travel. Operative means for connecting the former to the Work spindle and for indexing the work, as well as means tor Thus the teeth of the mounting and adjusting the grinding wheel,

and the relation of the grinding wheel in all aspects, are fully illustrated in inyprior application Serial No. 578,288 aforesaid.

In order to remove all of the Istock necessary to bring the work to iinished size,vseveral successive cuts on each tooth are required. .l prefer to feed the work piece for each next deeper cut after a preceding series et cuts or" equal depth have been taken lon all of the teeth.

the work spindleslightly about its axis before beginning a sub- Feeding of the work is i ao . the ratchet teeth. On the outervface of the gear67 are secured a number of detach` able cam segments `73 r(shown in Figures 4and 7 the function of which is to reciprocate the' rack 40 whenever gear'66 is turned. These cam segments when all in place formv a complete cam of five lobes;

i "ff and they are made detachable in order that psegments havingv greater orless lift, or no lift, may be substituted'4 for one another. lt will be noted in Figure 4 that these cam segments have no rise whatever in Vhalf of their angular length, and that their whole rise is` limited to the-remaining half. This construction is provided to rpermit alternate ysteps rof the cam being taken without affecting the work feeding mechanism and to cause the intermediate steps only of the cam to operate'this mechanism. I call this cam the secondary work feeding cam. l.

Returning to Figure 8, there is shown in mesh with the worin wheel 66 a worm 74 on a shaft which, rotates in a fixed bearing and carries, at the outer side of the base, ratchet wheel 76, shown also in Figure A 'pawl'77 drives the ratchet^76 stepv by "step and is operated to that end by the work. driving mechanism through-a link 78 connected to `an arm of the work driving lever 14, a bellcrank lever having an arm 7 9 yconnected to link 78, and a'second arm 80,

a link 8l connected to the latter arm, and

a pawl carrier 82 mounted to oscillate about the shaft 75 and on which the pawl is mounted.l The ratchet wheel 76 is interchangeable with others and pawl'77 is adjustable on the carrier 82 accordingly, and the connection of link 81 with arm 8O is adjustable toward and` away .fromfthe fulcrum of said armin order to adjust the machine to work on lgear blanks of different diameters and pitches.`

Whether Vthe primary work, feed cam-55` is put in operation depends on` whether, respectively, the sleeve 46 or the sleeve 44 is withheld yfrom rotation.. and thelother sleeve left free to turn. Alternate arrest of one sleeve and release of the other is effected by mechanism both mounted on asrock-shaft 88 and eX- .tend toward respectively` opposite ysides of g the work driving mechanism ory the axis of the sleeves, with such anl angular spacing that, when said shaft isrocked in one direction, the' stoppawl 85 isplacedin the path ofthe abutment84 and the stop pawl87 is moved out of the wayvof, the

abutment 86, and viceversa.'`

On the rock shaft k88 is an operating arm,

8,9 connected to a shift bar'90`which, when moved upward, releases sleeve 44 and arrests sleeve 46, and when moved downward effects the reverse condition. 4This shift bar is controlled by `.the timing cam 63 and its p built in which the eEects described are obl tained in a differentnumber of steps. yItis to be noted, however, that the angular extent of each rise on the secondary work feeding cam 73 is comprised within a single rotational step of the timing cam, while between the successive rises of the cam 73 are dwells fully as 'long rangularly as the intermediate steps of the timing cam.

.It will now be understood-that when the work driving mechanism is in operation, they timing cam is slowly given one 0f its steps.

of rotation by a succession of steps of the pawl and ratchet 77, 76 and gearing 74, 66,

while grinding cuts areL being taken in succession on the several teeth of the work; a

dwell in the secondary work feeding cam 73 then passingunder the rack 40. Vhenfthis step of cam 73 is completed the timing cani shifts the relation of the holding pawls'85, i105 87, the cam sleeve 44 is arrested and sleeve 46 left .free to turn. The latter then drives theprimary work -feed cam `55, and said'.

cam, through arm 56, gea'rsegments 58, 59,

and pawl and ratchet 61, 62, advances thefllo secondary work. feed lcam 73 while .a `rise thereof passes under the rack 40 andthe `latter is caused toturn the work feed nut 26, by means of the pawl'and ratchet38, 27, i115 to raise theformerabutment 1l. At the end of this step the timing cam, which has been moved in unison with the work feed cam 73,

again reverses the relation ofthe stop pawls i 85, 87 and thexwork .driving mechanism is* again put in yoperationr toy cause another grinding, cut to the work- Thereafter the work feeding and 'work driving mechanisms are operated (malt-ernation until the inalor finishingcut is taken.

During the timel when thework driving mechanism operates, the dwells of the secondary work feeding cam pass under the feed actuating rack 40. without causing any movement ofthe latter; `and whenk the work feed- .K

be.v taken von allfhe teeth of iso ' (Figure www ing mechanism is in operation, the steps then given to the seeencla'ny' camg731f eausevthe "rises of saidf cani tofpass under the ifa-@l har and" displa'e the latter. V'The anfreunt o termined' by thehei'ght of fthe eamrise-Which previously` operated "the `reeel' nieehanis'ni. By changing* the, segments of' earn.' the length ofA each step'y of-'therfeecl may he Vbelt froma pulley fastioirthetiriaini shaft '42 to an adjacent pulley loose o lr'sa-i'cl4 shaft. 'p This shifting of the beltpis eceoniplished under the control ofthe timingl mechanism by the followingmeansf-A 'helt shipper' 92 .horizontal enclyvi'se-nioyahlerocl 94 (Figure leekeda with, a

1;) This @deesse 'through gee 915 on the; :frame the machine and eaI'jri'es; a oQllariQG between which ,anclsaidelug is conlthe fast pulley," a seeonl collar 99- on roflfv 94: is" Carried Beyond and?` iintfery p late hvliOO ('Figures land Q4) which isfheld upin* locking'positionhy Va springfpressedf plunger. 101" afil lifs' provi-deel 0f, a Stud Qreqere'lent proeef 1,03 '0115 the heb of the eser f6?. TheJPrQieQPvn 1:03 iS so positipned; that when thegcyele' ofltlie'ma- @bine @idea-has arrived @1t-@hemmt whereit displlaees latCli 1100 andv release'sthe rod v9 4. y

Vthese articles, thlfe isi some variatibnhetaeen pieces iiitentllefl toy loethe same asl `tothe grqnnglufInginitially settingthev Work the Alatter Iniist he: gi'yen a eorreetangflilar relation/to the forrnei; since the y angtilar'distance ofthe toothlontliege'arlfirst to he hrouglit ta-,the glpinlingWheelfcleterniines the' amount eilt. Q ncetth-e Work is'seouredto'thespinclle f iterentpostons.- v

fromJ thegafljaee'n distance away`- 'and shaftiuigl p y mentiu'in; to 'stia-rt'- the; Carrelage! iii-the oppositie f* 'material'v ''romlifthe aoesi oi'1v the teet for othen projections Whielr have to be slide;

all the teeth Will helgro'uncl rtol the same thickness -jwitlirl respect ite" an. assumed center line' of each tooth'. y Een sosettnglftheyworl Ilfljave yprov-Milled a locating inemberwhich orftheir equivalents, fispr'a'eti'eally ne'cessa'ry the f turnier o'eenpe's jangulairlyfwth .respect toethe `Werk slide -f when: the glatter isk iin! dif'- The v loeating` inem ed" on `a stud i105/ Whi'ehvextenlsfirom one end of la shatvlll anclisjeceentriefite-ythe shaft.' j -Sail is"'rotat'agloly' mounted in `a hearing 1,507' onf theVv upperzjencl eflfthef'slicle an@ protrLides-j thereroin at :en'eenrlgawhereon risf-s'eeureclan eperatingg i e 1042 is` arrangedfte ove l 'f the ripper.' enel Offb@ 5336-5" ail-fl ri yf fcdiineetett tofo'r iN'orma-llytile eperatifi'igkarin` y108i van'elE/leif' fi's3 the sidefaWay--iigom the ma'eli/inembase.A "W'l-len-f the slide' is at ether lower' Aendl :off lits eating alriir 1042er@mythe-position; shown in travel the locating arno' issoinewhatremoyed l in Vthe.latteny isulessfthem;

lo ave; f rleasenjoit their medirection;

come-any tendency -whiohtl'ie Vdlnwing pulley;

shown"r in Figure# li tpthat shown inixllliglines 2 and* lQyWliereitifis aiirestiedliy: stpx 11111,k 'and tllejloeatirigileven 11941 isthussshivftedlun- 'ofjth'eb'ase-.ff The serew stopzll'fbeanssonethe Before- 'thef operating arm'.v has reached the stop 'llOand y latter arm ae`t`s, throngh the?y lbmiting` 1 'avian yaridstfo-p, tol meveltlhe Workfslicleinto ayprethe final: n1oyeinent:v of @the cl'eterriinecll positio'm theI same trimef, the l New., whenthrworki'pieees' appliedlztolfw v v the' spindle'efthe' operating;fannoA of tli'ejnlo-v eating 'deViceis-'brought tniftheposition r force holding its face `9 in contact with -the abutment, isrolled into the predetermined y position for setting of the work.v It matters not what this precise position is, provided .the gage is adjusted with reference l-to that position. Whatzis accomplished bythe lo- 'l eating means is the 'ability to p lace the slide in lexact location, and inl the same location, when each new workpiece is applied. The

1 capacity. for adjustment of the stop.110 en- ;,ables the locationtobe changed and graduationV marks 113 on its head, coacting with a y lstationary index 114, enable the shifting hof the'slide from lany fixed position to be exi The facey 116 ofthe gage corresponds to a` actly measured and its re-location at a know distance to. lbe correctly effected. v

eating means justv described is a bai' 115 (Figures 2, land 14) mounted in a suitable holder land projecting at onev end to enter a spacebetween adjacent teeth of the4 work.

rack'tooth face and makesy contact with the adjacent face of tooth 11'? of the work piece.

The gagegbar is secured by a set screw 118 in a holder 119 andthe latter is pivoted 'by a pin 120 toa bracket 121, which, in turn, is :adjustable towardr and away from the work spindle on a guide 122. The guide, in turn,`

is angularly adjustable on a plate 123 which lsurrounds the workl spindle and covers the guide in its various adjustments.

ments ofthe bracket 121 toward and away (from` the spindle .are provided for to accomend of the bearing sleeve thereofand'is secured to arigid part of the work slide.

Topermit this angular Vadjustment of the guide 122, the latter is formed with a curved lbase Vportion 124`and curved .slots 125, concentric with thefwork spindle.- Clamp screws 126 passing through said slots'in the base 124 and screwed into the plate123 secure the Adjust- ,-modate :the gage to gearblanksV of-diiferent ldiameters.

n A clamp screw 127, passing through the brackety anda slot 128 in the guide, secures these adjustments.` -A- spring `129 stretched between abutments on the .bracket and on the'gageholder, respectivehly, normally holds the gage out of contact with L'the work piece and in the position i shown by dotted lines in Figure 14. f S

Then the gage is to be used, it is swung A forward into-a space of thev work piece and may be made fast by tightening Athe pivot 120, the latter being. a screw mounted in a well known manner to'perm'it it to be tightened or loosened so as to clamp or release ythe parttwhich turns about it.y Thereafter the work-piece is secured to the spindle by tightening the holdingy lnut 130.

By adjusting'v the position of the gage angularlyabout the work spindle, the workpiece maybe adjusted to control the amount of material to be removed. In addition, a

The gage which cooperates with the lo-l fine-'and delicate vadjustment maybe given by turning the stopll() while the gageji's Y made fast to the work slide and the work i pieceA is freey to turn on its spindle.- -Such adjustment of thestop shifts the work slide and causes the .former and the -workspindle to be rotated relatively to the work piece,

the latter being then held back by thegage.

erence to work'pieces having the `vmaximum amount'of material toA be removed, rand is preferably such that when such a work piece kis appliedto the spindle las described a light cut will be v`taken in the first pass over thec grindingwheel.

- .Therangeof movement to be given to theformer-"abutment for,r feeding the work betweenvsuccessive cuts, as previouslyrde- .The 'setting of the gageis. made with refscribed, is determined with respectto the sameavoi'k piece; that is, lone having the maximum amount` of surplus stock to `be `removed. Then the back stop 32, t'owvhichl the feed vnut l26 isvbrought back aftery the completion of each gear,- is set so thatthe 4'abutment -11 will be brought into the proper 'relation to the former and fto the1 gage to f cause this light cut lto vbe takenin such a work `piece 'inl the i'rstlp'ass. Thenthe amounts of rise the ,severaly segments or lobes ofthe secondaryv work feeding cam 73 are determined `according to the amount f of stock to be fremovedxfrom suchfa work piece in order'to bring it .to a` final finished size. That is, the sum of the feeding steps given jbythesuccessive segments ofLthecam will be,y great enough to` bring theformer abutment` tov the AHpoint at `whichftlhe', tooth being ground will have the -inal thickness.

It will be notedfromFigure2 thatthe face `ofthe tooth on thework piece which bears on the-gage face y116is opposite to that face of the tooth which isacted on by the grindc ling wheel. Hence, a work piece on which theteethr are ofleiss than maximum thickness will, when set. as' justy described with reference to the gage. bevmore distant from the-grinding wheel when the first pass takes place, than oneof the greatest thickness.

'It is part of my invention to enable work piecesv havingteeth of-less than maximum thickness to bebrought'at onceinto grindtime taken for. a whole, series of cuts, or even two or more series, on the work may be saved.' To accomplish this enduit is necessary that the secondary work feeding cam be rotatable independently of the timingmechanism, and that the work driving meansshould be disconnectable from the timing mechanism, so that thework maybe' brought into contact with the grinding Leimen;

wheel I- 'i'efo-'rey the timing mechanism f begins tol function. It is alsone'ces'sry as 'a safety measure to heiableto stop thefmafohine 'at any time, and to restart ie, an ,without ineens-g tire-{timing-iaee1fransma To serve these i irp'oses,v 'that'partfoiT `the eohn'e'eti'on fronti Lthe Work -drivingf meehanisni'to the timing m'eehanismwhieh Ihave heretofore A"des'eriio'ed as "a l:hell vcrank lever living tvvo arnYsTQandf'SO, is made of two sefarate "arts, hoth -pivotd yrmftl'ie same fstuc 13H-ias shovvnjfurther in Figure 6; The y'ari'n "80 jisprov'ided 4'With a lug 132 which overlaps arm 79, Whereloythemotion of the Work 'driving mechanism is posi tively transmitted to fthe patvl' 77 `in vthe driving movement 'of thelatter. Assoeiated rigidlvvvith arm() Vis. an -farm- 133, and a spring' 134 is vvrappedfarohnd the hub `of the; *lever 8041335 and engaged yat its. 'ends Wi't'h the A"arms V79V -and 133so-fas" to. .canse arm 180 to ollo'vv' 'armQon the return 'st-rohe but permit itslkheifng l1festrained 'by 'superior 4force from so ffellvv-ing.'i :Airm' 133.has 'a `latch A'sh'cnllder 135Yon-the upper side of its outer end. Y

4A. leverf136 i's-mofunted: on a .pi-vot 13'? fandfhasialug-l'prvided `With a latch shoulder 139 "on its under side adapted to overliej andinterloelrwiththe shoulder. 135,

asslifown 'by.clottedylinesinf Figure 1, .A stud 140 is fearried b'yfsai'dilever 136 and 4hears against` the collary `96.onthe V'loelt "shipper'rod 94.

vWith the movements of the mechanism the 133 oseillates between the full -line@,iposi-tio1r and the` ,dotted line lpo'sitionshown.fin.'Figuresyl Jandf 5, fthe associated zarms E-.and ,'79: heilig also ,oseillated through :the same range of movement. In :the '-lovvermostv lzposition of: "Lfrm .lybu-.t in no other position thereo,^its 'looking ,shoulderf'f135r-niay 'he fpassedfover by theV lug 138 .of lever 136. Said armis-in.itsfloxvermost positionfatithe vmoment when thev stop mechanism -is `t-1.'i} :11: ed at.y the-fend or the grinding cycle, hythe--releasef-of-the belt shipper rod, as;previouslydescribed;- and vat that time the collar 96` on the shipper rod 94 throwsl the lever 13.6 ,-toj thevdotted vline position, :its lug; then overlying the end of arm 1313" and Vvthe gshoulders 135Mand 139 becoming iinterloeked. Any movement ot the Work Vdriving mechanism wvhieh new tahesplace ivvill 'have lno e'ieet .on the tim'- ing mechanism.

, This is the-condition which eXSS ever ya. nevvv Workfpiece is-applied 4tothe ma-y fchine. 1 When-fthepiece has been :gaged and set as; deserlibed', Ythe Operatori: Sets the' ehin'e in motion by Vpulling-the shipper rod to fthe right `in .Figure 1 byfmeans-:oithe head 98. If the Work 4doesqfmat Comeinto Contact fvvith thef grinding Wheel: rfhe first apaise;thew operator. turnsfthefseeondary feed `rack bar.

cam 73. byfmeans 'of the hand operated shaft v arm and the-connection is again made bef tween thevvork driving.meehanisml and the timing mechanism. It is to Vbe `understood that the operatoryeompletes this Connection as ,soon as thetest carried iout vas above described `shovvs that the Work .is far venougl'i advaneedto be ground. vIt may he gon the first pass over thefgrifnding lWheel or after the eedzmeehahism has .been advanced one, two, or. even more of -its1s'tep"s.. In case the teethv of the vvork piece shouldhel consider l ably thinnerfthan the maximum, mneh time is .saved in grinding the piece to iinished size because all ,of the-prelnnrnary motions required with a gear having teeth of maXimum .thickness are skipped.

The pavvl and ratchet drive betweenY the f fgea'r Wheels .66 and-67r permits 'the feed mechanism to beadvanced by yhand-in thisaW-ay and enables `1t to befautomatieally connected with the timing meehanism ask soionas` .the

latter is put in operation. 'No particular care isneeded on the'part .of the operator in turningv the feed cam by hand, provided he vcompletes eac-h step of they feedv and carries the high fpafrt of `the 'ea-IhV segment past the i Ifhe earriesit a litt-le too `far. no harm is .doneiheoause "of the'subsequent dwell in the -eam surface. and Atherfaetthat the -pavvh Whenad'v-aneed by the timing mechaN nism, will `pick up the cam and-'advance it -rthe remainder of the 4next partial rotation.

-For stopping the.y machine in. an temen genoy, Iy have provided a lever 141 -pivo'ted to the 'frameat 142 and'havingfa.:projection 143 .adapted to engage a trigger-144. The trigger-is pivoted `on a lstud 145 and has av the lever 141roceupies the lposition shown in Figure 1i, but in order to stop the machine instantly in emergency this lever is raised to the` position'shovvn in Figure 5, 'Where its projection :143 engages trigger 144 andgdis- 'engages the latch 100 r from the belt shipper linger '-146 overlying an extension 147.011 the `latch 100. Vhen `th'e machine is running,

rod 94. "Itisimportant at such times that 1 the timing fmeohanismshould .not be vdisconnected :from the Work driving mechanism, because if,'upon re-istarting the lmaehinathe `,operator should not thereafter immediately disengage lever 13,6 from the 4disabling. arm 133 of `thetiming mechanism drive,"-the oor- -.-re,ctrelati on ofthel timing mechanisinto the .work driving ymeehanisnju wouldJoel vder: stroyed; altheugh the Work drvng'meehaiso nism would roll the work past the grinding wheel, and indeX it after each pass, the tim-lr ing Amechanism wouldV remain inoperative and no further feeding movements., would f course of an emergency stop it will not interlock with the arm 133.

"of time. ance of the cutting action is otpartieul'ar They pivot 137 of this lever is carried by alink 148 which is hung from vapivot 149 on the machine frame. The pivot 137 is connected by a link rod 150 to the lever 141 at the point 151. The lengths and positions of these parts, namely, links 148 and^150 and pivots 149, 137, 142 and 151, are all-so arranged that, when the emergency stop lever is raised to release the -beltshipper, the pivot 137 is moved laterally, and slightly downward. .The lever 136 being then turned about this displaced pivot point by movement of the belt shipper, its lug 138 moves in a lowered path in which it is obstructed by the end of arm 133, even when the latter is in its lowermost position, and will not pass over andlock such arm. When the emergency stop lever 141 is released it will drop back nearly tov normal position. The machine may then be started again by swinging the locking lever .136 to its normal position (that shown by full lines in Figure 1), where it tends to stay until displaced in either vof the ways just described, or manually.

It may be noted thatwhen the emergency stop lever 141 is in its normal or lowered position it rests against'a stop 152 and in that position forms, with lthe vlink 150, a toggle linkage which holds the pivot 137 immovable by any forcewhich may be applied thereto through the locking lever 136.

In its turn the locking ylever may be re-v strained in its normal or inoperative posi- -tion by a suitably arranged spring or other yielding withholding means which will pre ventv accidental interlocking engagement with the disabling arm 133 while permitting engagement therewith under superior force exerted by the shipper rod 97 when the lock 100 for said shipper rod is tripped.

By virtue of the locating means for the carriage, the gage for the work piece, which is adjustably fixed to the carriage, and the means for disconnecting the timing and feeding mechanisms :from the workdriving mechanism, it is possibletomount work pieces on the machine in such position' that the lsubsequent automatic operation of the machine will `removey the amount of stock required to bring the pieces to final finishedform and dimensions; and to set up the'work piecey thus and bring it into ContactJ with the cutting tool with a vminimum expenditure This time saving in the performvalue in view of the fact that the-conditions of this character of work,.in the automatic operation of the machine, require all of the teeth of the work piece to becarried past the cutting tool before any increment of feed movement isgiven to thework.

It is apparent, of course, that the setting ofthe work and operation of the machine as heretofore described results in the lfinishlto set up the work for the tirst grinding so that less than one-half of the total amount ofV material will be removed then, leaving thek greater amount to be vremoved [when iinishing the second side of the teeth. That is, in the first cycle, the teeth` are ground on one side deeply enough to bring them to true Y form and then a little more Lmaterial is-cut away; in otherwords, to grind away a little more than enough to cleanup all ofthe teeth on one side,leaving to the cycle of operation'performed on ther other' side the task of bringing-the teeth to final finished dimensions as well as true form. This is only a preferred practice, however, and is not obligatory, v i

The. practical necessity.V o1" the locating device which I have previously described is due to the' fact that the work carriage cannot be depended upon to stop always in exactly the same positionl Iwhen the machine is stopped, althoughv the stopping Vplace may be nearly the Isame ,onv all occasions. The particular locating vdevice described is not the only means which .may be used for the same purpose, but may be considered as a typical means and as representing generi cally any and all forms of such means.

An alternative device for the purpose, which is considered as embraced within the generic definition ot such means, consists in provisions for moving theoperating or impelling cam k13.to a given yposition when setting up the work, for this will also bring oit the frame vwhich surrounds thecam (see Figure '1),and into a hole 156 lin the cam (see Figure 3) which comes within therange f ont the slot when the machine stops. Then by moving such insertedbar until it brings One way Ais tov insert a bar through a slot 155 inthe partv up against one end oit' the slot a iXed locating point for the cam and consequently.forv

the carriage, is found. Another way yof so moving the eam as to obtain the sameresult vconsiSt'Sfin turning the shaft 53 manuallyy byv a Wrench or equivalent. device applied to the outer end of 'fsa-id shaft.; 'As this shaft i is made fast to the sleeve 46 and the latter is geared to the sleeve 44, carrying the impelling cam I3- through the train vconsisting of the gears 49, 48 andpinion 50, rotation of the shaftw'vill rotate the eaml The posiT tion to which the. cam is thus moved isde-k termined by the stop paivl and that one of the abutments Se on the sleeve 46 which is adjacent to the paWl when themachine stops.

Thecharacteristics of they timing mecha' msm are such that when the maohinestops at the end oi' its; cycle, the pawl or dog 85 drops in the path of. the abntments 84.`

Then, in accordance with the. presentfinvention,- the lowest part of the cam, When in engagement with the rroll 17 on lever 14:,

is slightly in advance of the engaging lo-v cation of the nearest abutment 8.4i with the stop paWl 85;. The machine naturally comes to rest when 'the lowest part of the cam is beside. this roll. The relation oi: the abutment and stop p'aWl isthen'substantiaflly as indicated in' Figure l5. The manual rotation which' is now givento the shaft 53,. in order to locatel the carriageA as justdescribed, turns lthe cam until abutment 84 is arrested by the stop pawl 85. Thisl is an exactly def piece is applied.

termined location and it causes the carriage, 1n turn, tobe placedv in an exact location, and in the same location'whenever a new Work Although in the have referred to the Work as a spurfgear, it

isto be understood that the same character of operations may bexperformed by machines having the'r same principles as che-reinbeor'e Well as the. specific machine element knownv as a spur gear.

Evidently reversals andv otherv modifica-` tions in the arrangement Vand structure of the parts of the machine may `be made With-v in the spiritoif the invention', Wherefore it is to be understood that I do not limt my claim for protection to the' details of the machine? -liere illustrated, and that the "appended claims are to be' construed as including such reversals and modifications Withinthe range' of ntheirl 'equi'valentsLl l lVhat I claimy and desireto' secure by Let-V ters Patent 'isr g l. A generating machine of the cl'iaracter foregoing description I' setlforthincluding a reciprocating carriage,

a spindle. rotatable on said carriage, Vl'neans increments of feed movement toy takev place inalterna-tion with a series. of reciprocating movements of; the carriage, a locating means for placing the carriagel ina definite position,'and a gage mountedadjustably on the carriage and adapted 'to determinethe posi.- tion of a Work. piece. on said spindle. v

2. In a' generating machine having a base, a carriage. movable back and'forth on said base, a work spindle rotatably mountedon the carriage, a former-connected with the spindle, a complemental normally stationary abutment arranged to yCooperate 'with said' former in giving a Vrolling motion to the spindle when the carriage is, so moved, an adjustable locating member arranged tov cause placement of the carriage in given location en the base, and a gage mounted OI.1 the carriage and arranged to make Contact with il Par-t oi a workpiece to .cause placement of the Wer-k piece a ive-n angular relation to the for-mer when e carriagey is in suchfposition'. l i y K. f

V3. A generating machine of the character set ortlncomprising ab'ase, a Workcarriagev movable back and forth on, said basen; a work spindle rotatably` mounted on said carriage--V complemental elements @Qlfnec'ted to said 1700 tol-impart rolling motion tothe spindle When;

' spindle and base respectively, and arranged the carriageiis thus moved,- mechansm for so movingY said carriage, automatic mec-hanism for shiftingone of: Said v complemental' elements, al timing mechanism constructed t0' cause alternatezaetion ofthe carriage driving means and said automatic shi-ftngmechanisl-n, said last-named mechanism:including a driving. impeller positive in one direction only, and manually Operable means for pro.'-y pelling the shiftingv mechanismindependent 1y of its automatic impeller. e 4l. a gear generating machine having-a former and abutment, one of which is arranged to.; rollA upon the other' for giving-v rolling movement toy a; Work piece, said abutment being movable independently of rollingY action so asi tog'ive a feeding incremaentv oi`r rotation to the Work piece,` an automatic fdlg' mehasnism for iso-movingifid abutment including a driving Vpart-,iva driven part and a: propel-lingconnecton 'between said parts arranged. to transmit motion from the drivingpfa'rtto the drivenpart and to permit independent movementin the same, (li-f recti'onof the. latter'ahead of the former, 'and means for enabling the Ydriven part to,- be driven independently by manual opera-timal 5.1.` In a gea-ry generating-zmaehine, a-utomatic gear rolling: mechanism including ,a

carri-age, a spindle rotatably mounted onthe V carriage, a'former connected With the spindle, and 'an abutment arranged to Vcause rotation'of the former When'the carriage isk moved, driving mechanism for the carriage, said abutment being'shiftableto change the angular positionof'the formerand spindle independently of V theV carriage, automatic mechanism for so4 shifting the abutment,

timing mechanismdriven alternately by the carriage driving Vmeans andthe -abutment shifting mechanism, respectively', for causing each of the other mechanisms: to become operative exclusively #in alternation, and

means for interrupting the connection betWeen'the carriage vdriving mechanism and vthe timingmechanism, -Whereby to permit-a 1 preliminary adjustment of the Work.

' 6. A' gear generating machine comprising a carriage, a rotatable Work spindle mounted onV said carriage, a former-securedto the j Work spindle, an abutment cooperating With the former tooscillate thespindle When thel j carriage ismoved back andfortlnautomatic i Work driving mechanismk for moving the carriage, automatic abutment shifting imechanism. for displacing` the abutment togive a feeding movement tothe Work spindle, tim-A v ingmechanism constructed and adapted to put said Work'driving mechanism in operation, at the same time disabling the abutment shifting mechanism, and toV put said abutment shifting mechanism into operationV "at the Sametime. disabling the `Work ydriving mechanism, means'by Whichthe Work driving mechanism andthe abutment shifting mechanism, in turn,drive saidtiming'mechanism, lmeans for disabling Vthedrive from the -Work feeding 'mechanism to the timing frniecliavi'iism,y and means for manually shifting f the abutment independently of the auto-inatic mechanism for that purpose.

7. In a gear generating machine having a base,V aback and forth moving work car- ]riage, a spindle rotatably mounted on the carriage` a former secured to the spindle and a complemental abutment for rotating the spindle when the carria e is so moved, an-

adjustable locating mem er'engageable With the'carriage and base for placing the carriage in a given position ,on the base and shifting it by measured amounts, a Work gage secured to the` carriage adapted to con- Vtact with a Work piece-on the spindle and being adjustable angularly about the spindle, automaticV mechanism for driving the carriage, automatic mechanism for, shifting the abutment to feed the. Work, timing mechanism for putting each of thepreceding mechanisms alternately :into operative condition,

at the same time puttingithe other of'said mechanisms outY of action, a disconnectable driving connection from the carriage operating mechanism-to the timing mechanism,

and a transmission .connection in the abutment shiftingmechanismi-Which is positivel only in the feeding direction and is yieldable` to permit advancement of the abutment beyondthe mechanism for automatically shiftings.' Y

L8. In a'generating machine of Jthecharacterl described, a base, a carriage movable backY and forth on` said-base, a 'locating means. for setting the carriage in a given position on the basenearone end of its'travel, said:

locating means comprisingan arm, a shaft i rotatably mounted on the carriage and Vhaving an eccentric stud on which said .arinis pivoted, a second arm'associatedTvvith-vtheY first-namedarm and Vhavingv a stop member. adapted tobear on the carriagewhen the first arm-bears on an adjacent part ofthe Y base, and an operatingarm secured to the shaft and operable to rotate thel latter so as 'to bring the aforesaid arms into and out of operation. i i y9. In a generating machine ofthe character described', a base,V acarriage movable back and forth on said base, and means` for locating the carriage in a definite position on the base comprising connectedarms,r one of which is adapted to bear on a surface Y,

r*of the base VandY thel other to lbearon ya surjface of the carriage, andA a movable mount.

for said armsope'rable to place them inzand outv of operative position'.l v Y l 10. Inl a generating machine-of the character described, va base, a carriage movable lon said base, and a carriage vlocating means! comprising connected arms and a mount on ,-Whichk said arms aref-rotatably supported,-

said mount being shiftab-le toput said arms. into a positionv Where one of lthem is adapted to bear onthe carriage and the other is adapted `to bear jon the base, one ofrsaird-y ino llla') arms having anv adjustable VstopV through,

the adjacent member being adjustable relativelyto the other arm, whereby to eifect an adjustment in the positioning ofthe carriage.

l2. In a scribed having a carriageq a Work spindle mounted on the carriage, a former connected to the Work spindle and a lrelatively stationi ary abutment against Which the former acts,v` a gage mounted on the carriage With provision for adjustment angularly about the. axis of thespindle and mounted to coact With a peripheral projection'of the Work piece,

and amount for lsaid gage constructed to i machine of thecharacter ,dei n ofthe carriagey at a fixed point in its travel,

.said'method consisting'inlocating the gage in suchangular relation to the-former that placed on `the, spinilleY in locating engage- *iinent with thegagatlie carriage then being in a given position, such `work piecewill be abutment combinedfwith a grindingwheel` Y d nlock. andV shipper being so arranged that the movement 'of the shipper tostop-tlie machineV applied. thereto incorre'ctly-related toY the cuttingtool' tov be acted on by thelatter when rolled past it;r

then placing similar work pieces, but 'hav-V Ving less stock lto beremovedfon 4the spindle with the same setting `of the gage and carriage, making atest pass ofthe worlrover the `cutting tool, andthereafter manually displacing theabutmentand making a further test pass until theworlris brought to the'ad.

justment wliereit is acted lon by theeutting tool.V f 22.l In a gear .generating machine-having aY carriage, a AWork spindle, a formerfandilan and farrangedtocause such combined movee `ment of arwork'pie'ce xed tothe spindle,-

whenrthe'cairiageis moved,1that atooth face yof the work VpieceY rolls over the face-of the grindingwheel, fa step.` by stepv feed mecha-f nismfor 'shifting'.the abutment so4 as to ad-k Y vance the work relativelyV to the grinding wheel, an automatic driver for said feedY mechanism, a power transmitter 'between Vsaid driver and mechanism-which is positive only in the forward direction, and a'manually operated driver: for said feed mechanism transmitter. 'Y

23.v Ina generating machine ofthe characterset forth, a .worky drivingmechanismfa timing mechanism, Va trai'iismission mechanism from said worlrdriving mechanism toY thetiming mechanismand including a trans'- missionmember which Vis positive in one. dii rection only andV a fyieldable connection through which movement in thek opposite direcition is transmitted, there being a detei'itv element onv the power-receivingpart of'sad transmission mechanism, combined with-an `automatic.'means for stopping the machine, and a locking member operable by saidsto'p pingg'meansand arranged to interlock vwith said Y'detentelement to prevent .actuation of the timing mechanism when the machine is' I agains'tarted.

a machine -r `of fthe character der-AA sc ibedthe combination,with VaVwork driv-Y ing mechanism, of atransmission memberl 'ydri'ven thereby r'and l,including .aY driver, a'

lower are arranged to vtransmit jmotion .in

the opposite direction but to yield y.when the follower is'jarrested,a detent connected to i the follower and jaja loclcoperable to withhold d vance VofV said power` follower and ajspring,which driver and fol.-

` said detent when., the .followerjlapproXi-j mately at the endof /thefmovementv given by the positiveaction of the .driven f 25; In a machineofjthemharacterdef scribed thel combination .with a: Work driving mechanism, :Y of a vvtransmission"V Vmember driven thereby andi'ncliiding a driver, a

followerfand a spring, which driverandfollower'are arranged to' transmit motion in the `positive action *of the idrivei,V said flock being combined Withia movablebelt shipper; alocl foiflioldingsaid shipper in the posi?.

tion Whichcauses the macliineto run, andV an Vvautomatic]ftiip for causingsaid-f shipper to stop the machine "at the Vend of thecycle, the

causes arresting engagement ofthe lool; with said detent.v Y l' j .kf r

'26( In a gear generatingrmachine', `an automatic Work driving mechanism,V anautomatic work feeding .'mechanism, fanV auto-i matic timing mechanism* constructed Vto e0.. mately atthefendof themoveinent given by I cause alternate operationvofyeachof the preceding mechanisms inl turn and with si-Y multaneous'intermission of the other mech-' anism,l an automatic stopping mechanism j for stoppingrthefmachine, trip operated 'by the .timing mechanism Yffoil- {causing acf`r ytiia'tionvof said stoppin'gmechanism, di-iv Y ing connections from thel workdriving' inechariism'to the timing mechanism includ?V ing complemental transmitting and follow# ing members which are 'positive in one dire`ction onlyand al springwhich isarranged tov transmit motion.r in the opposite direction,

Va* detent associated with said following member, and a'lockarranged'to engage said iio detent and prevent movement of the follow;Y

ving member through Vsaid spring Whenthe means is automatically Y machine stopping actuated.

27j. In a1 gear'. automatic vwork; driving generating machine, "an

'inec'hamsm',Y van automatic worlrffeedinglmechanism, an lau` tomatic timingzi'nechanisin constructed toV t cause alternate operation of `reach ofthehpre Y ceding mechanisms lin tui'nland in simul tane'ous. intermission ofthe 'other mechan ism, an automatic-stopping mechanism for] stoppingthe machine, "atrip operated i by the timing mechanismfor causing 'actua-Y tionk ofl said i stopping mechanism, {driving connections from 'theivork-driving iii'echaniV ismuto the timing mechanism includingcomvplemental transmitting and foll'owing'smem'z-I bers ,which are `.positivem one directio only and a .Spring whieh is arraneelte-treeem-t motion .the eppeefe direct assaeated with aa-id sllewiee einher., .and a leek arranged te `reni-ieee' said detent md prevent movement of the Afollowing member .through said .Spring when themaehne step..-

rne Ineens ie eutemetiealr tripped-,s the said members normally holding them together and transmitting motion in said other direction, a detent arm connected with said following member and movable simultaneously therewith, a pivoted locking member adapted to overlap and interlock with said Larm when the latter is at one extreme of its movement, a machine-stopping means including a laterally movable member engaged with said pivoted locking member in a manner to swing the same into position for interlocking with the detent arm when said member is displaced, a shiftable fulcrum for said locking member, and' a manually operated tripping means for said machine-stopping means, connected with lsaid fulcrum to displace the latter whenever the former is operated to stop the machine, said ulcrum bein guided to move ina path such that upon the locking member being then displaced by the machine-,- stopping means it isobstructed by the detent arm and prevented from interlocking therewith.

29. In a generating machine, acarriage, a l

work spindle rotatably mounted on the caro riage, and a gage mounted on the carriage with provision for placement in position to locate a work piece angularly on said spindle, and to be withdrawn from its locating engagement with the work piece. Y

30. In a generating machine, a carriage, a work spindle rotatably mounted on said carriage, means ttor giving a generating motion to a work piece mounted on said spindle, which Vmotion is compounded of displacement of thel carriage and rotation of the spindle, combined Vwith, a gage mountedl on the 'carriage and adapted to obstruct a peripheral projection on the work piece, and provisions for withdrawing the gage from suoli relation to said projection.

31. In a generating machine, a carriage, a work spindle rotatably mounted on the carriage, and a gage mounted on the carriage lwith provision for placement in posi- 9.11, keten? *i051 110 lpeate a werk-'piene ensalada ensei@ eliidla and te ylee heli-fawn ite 19:' `rerfenis engagement w1 ,t'l .tble'werlk "Piece, 11,1 lentille' with mfeaee" `for locating, .the 'e :in la given residen.. Y #generaties eine ,of ,the character Set ,ferthfeolm i s'lga bese, a earrerreeip# 'iteleateble the 0.11,"21' Werkspindle, Je .fermer eenneeted with gsite] Spindle, all` abutment .eeereratve 'with Seid fennel, rotatable vcutting tool arranged on a 'work peee meente@ 0.1.1 "Seid spindle? Seid nele ,leerte beine ,eeepeiatvey'arraiieede-nd- .01"- ganized to' eEect relativewrolling motions between the work piece and the tool; means for' locating the carriage in a definite position with respect to the base in setting up the work, and a gage for the work piece arranged to determine the angular relationl between said piece and the tormerwhen the carriage is so located. v- A 33. generating machine of the character set forth comprising a base, a carriage reciprocatable thereon, a work spindle, a former Vconnected with said spindle, an abutment co'- operative with said former,` a rota-table cutting tool arranged to act on a work piece mounted on said spindle; said elements being cooperativi-ely arranged and organized to et- ,fect relative rolling motions between the work piece and the tool, means for locating the carriage in a definite' position with re spectto the base in setting up the` work, and

a gage mounted with provision for angular adjustment about the axis of the work spindle relatively to the Vformer and having an element adapted to be placed in gaging contact with the work piece when the carriage is so located.

34. In a generating machine 'of the character set forth, having a/carriage, a work spindle, a cutting tool, and mechanism for eiecting tra-nslative movements of saidfcarriage and rolling movements between the work spindle and cutting tool, work setting means comprising a gage for the work piece and a locating vdevice for the carriage, cooperatively arranged to determine the angular relation ot the work piece to the tool when the carriage is in a given position.

35. In a generating machine ot the character set forth, having a carriage, .a work spindle, a cutting tool, and mechanism for effecting translative movements of said carriage and rolling movements between the work spindle and cutting tool, work setting means comprising a gage angularly adjustablefabout the axis of the work spindle and shiftable into and out of gaging relation to the work piece, and a locating device for the carriage. 36. A acter set Jforth comprising a base, a carriage, a work spindle, a generative cutting tool,

generating machine of lthe chan'v

Images