US2332603A - Grinding machine with wheel shifting means - Google Patents

Description

W. F; ROSS Get. 26, 19143.

4 Sheets-Sheet 1 Filed Feb. 6, 1941 Get. 26, 1943.

w. F. Ross GRINDING MACHINE WITH WHEEL SHIFTING MEANS 4 Sheets-Sheet 2 Filed Feb. 6, 1941 @ct'c. 26, 1943. w. F. ROSS y fi GRINDING MACHINE WITH WHEEL SHIFTING ME ANS V Filed Feb. 6, 1941 4 Sheets-Sheet 3 Oct. 26, 1943.

w. F. Ross I 2,332,603

GRINDING MACHINE WITH WHEEL SHIFTING MEANS Filed Feb. 6, 1941. 4 Sheets-Sheet 4 E I m W /f//W/ the cam shown in Fig:9

Patented Oct. 1943 -ff'i fl?) .7 o. V 'cmNnme-mronmn wrrri WHEEL" SHIFTINGMEANS' v A Walter FlRoss, Springfield, Vti,.assignor tofThe I Fell'ows Gear Shaper Company; Springfield; Vt.,'.

v v 9 Claims. This invention relates to grinding machines of the type. having a rotatable abrasive wheel/ Its object is to shift the abrasive wheelin thecourse of its action so as to avoid repeated tracking of the same point on the face of the wheel-continuously in the same path. This object may be otherwise expressed as being to cause tracking of the abrasive wheel in constantly varying paths, whereby to secure non-duplicating motions of the wheel. to produce free cutting and, inlarge measure, avoid-pronounced wheel scratches in the work.

The principles in which the invention consists may be applied in many different machines forperforming a; wide diversityfof'grinding operations on 'difierent work pieces. The application or use-here shown ffor illustration is jin connection with a machine for generating and finishing; by grinding, the toothv face curves of gears; gear shaper cuttera gear finishing tools, and the like. such'illustrate'd embodiment' is described herein to disclose the principles for which Iydesire protection, by reference to afconcrete example and with the "understanding that such principles are covered herein genericallyior. all

. combinatidns inflwhich they may be applied; as

well 'as in the closed. s V M Briefly, these principles comprise, the combination with a-grinding wheel,; andme'ans fordriv ing it continuously at suitab1e cutting speed,-*of auxiliary means acting on the" holder-to shift such wheel progressively through limited fldistances inpne or more. directions othertha'n the path oi normalitravel. V. 'In the drawings herewith---v 1 Fig. 1 is avertical section of the upper part of a machine for grinding gears and the like to whichI have'applied one embodiment of this invention; Fig. 2 is averticalsection of the machine taken on line 22 of Fig. 1'; s

Fig. 3 is a cross sectiontaken oh'lineS-B of Fig. 2 and shown 'ona larger scale; I Figs. 4 and.5 are horizontal sections taken on lines 4-.-4 and 5 -5 respectively of Fig. 3;

specific embodiment dis Figs. 6, 7 and 8 are cross sections taken on line 6--6,.|,1 and 8-8 respectively of Fig. 4;

Fi 9 is a detail vertical section taken on line 9---9of.l ig.5; I v

Fig. 10 is a fragmentary view showing a modi fiedform of cam adapted to be substituted for Fig. 11 is a. partial view similarito Fig. 3 show-, ing an additionalfeature adapted to be coma' corporation otjgyermontf "Application February'6, 1941, 'Seria'1 No. 377,627

Figls13 is a cross section taken on line |3l3 ofFig.i12.' 1." I

Like reference characters designate the same parts wherever they occur in all the figures.

For the purpose of convenient explanation, an embodiment 'ofthis invention hasbeen shown in the drawings as applied to a gear generating machine of the'typedescribed in the patent to Edwin R. Fellows No. 1,743,335 grantedJanuary 14, .1930. In such a machine a work piece W, which may be a gear; a gear shaper cutter, a shaving tool, or "other article having peripheral teeth, is rolled across the rim: of a grinding wheel G in such manner that the wheel rim projects between two teeth of the work piece, and the margin of its'sidefac engages the face of the continguous tooth, cutting and generating the tooth to prescribed contours and dimensions. The spindle'don which the work piece is secured passes through a housing e, which is mounted by means: of tubular trunnions f and'g in a swin frame h supported by the pivot ends of a bar 2.

A combined gear segment :i and cam k is secured to the trunnion' j by means of'a rigidly connected stud l. A rack bar m meshes with the gear segment arena is connected with one arm of vailev'er n. The cam element bears against a stationary abutment o.

The lever 11, beingoscillated about its pivot 11, imparts back and :forth rotary movement to the gear segment 7', cam is, housing e and workspin dle d. The cam k, reacting against the abutment 0, causes the entire. assemblage, including the swing frame 12-, to swing about th axis of bar thus'causing the work piece W to roll across the rim of the grinding wheel. A side face of the grinding wheel adjacent to its circumference perbined with the machine illustratedin the precedforms the cutting action on the work, and the wheel'i rotated at suitable cuttin speed about its axis A.- 2 The principles in which the invention consists comprise means forgradually and progressively shifting the grinding wheel back ing'carrier [3 having axially alined trunnions I4 and 15 which are mounted to turnin. eccentric bearing sleeves I6 and I1 respectively, supported alsorotatably inbearings l8 and I9 provided in a stationary partof the machine frame structure: The trunnion axis is shown atb' in Fig; 8 i

and the axis of the bearings l8 and I9 is shown at c in th same figure. One of these axes is above the other While. the grinding wheel axis A is approximately at the same level'as the trunnion axis 1). In other words, the axes b and on lie in a plane which is substantially at right an gles to, or at least makes a largeanglewith,

the plane of the axes A and b wherefore oscll- 'lation of the bearing sleeves moves the grindin wheel back and forth in the pilan'eiof themes-* A and 12. Means are provided, and will" presently s be described, for s oscillating the bearing sleeves.

Other means are provided forswinging theiholderd I3 through small angles around the axis l), where-. by to raise and lower the grinding wheel; i. e.',

withheld from rotation, a guide '32 carries ;a

roll 33 on one end which bears on cam $0., and

its other end hasf-rotative bearingin, andathrust shoulder :34 hearing against, a, worm :orzrscnew 35 which is splined rtman adjnstingwshafit- 36 and is pressed toward cam'iitl by a spring vreact-1m; against a stationary "abutment 38. 'Shaftitii 811p! ports. and sguides worm 'si and also iserzves as a means by which angular adjustment array-113's manually imparted 'toitheworm atz-ne'ed;

gear "or worm wheel =39 *(Eig. 9)."lindl'lies and meshes with the-worm and is secured to a shaftm] which'extends :inwardlyflfrom-"the housing fi lzand carnie's a-rcami'l on itslin'ner end (Fig. '7) beneath the carrier lfisandioniwhich v aproj'ection'fl thereof restsg I it will be evident from the foregoing fthatlthe slowlyfrotating cam 88 Treciprc-cates the :worm 35 and, through the latter and "gear #39, o'soil lates i l. Any desired extent, rate and diming "of movement may he imparted. thr ugh this mechanismilto the Fgrindingiwheel earriemby ap propriatedesign or the wormrandwheel' gearing tratively one suitable dorm of sire-h cam; has a single throw of gradual and corr'cirmous rise andfl'eseent, :Fig. {:10 shows an alternative cam =3a having;rivepsymrnetrical dob-es, other forrhrof c'am 'mayybe su bstitutedxfbli ethese;

' Lhe worm wheel 28, previously mentioned; is secured to -=-a shaft-43, on the inner yen-d of which is a, cam VI-his cam oscillates lt'he r-bear-ing sleeves 'l fi and H th-roughrar'ollowe wroli filpiv oted at any-intermediate ap'oint on "a bar 46 which is secured at its ends to "arm' -'4! lama 48 which are -=rigidly connected, 'orintegral with the bear-5 ing sleeves l6 and H respectively.sqlAspning*49 acts dnrconiunctionwith gravity to hold thefroll again-stc'am=4. v

bar We constitute aiyo'lre pivotedf'in :aline'd .rbear-r irigs and having "eecentric bearii'ngs for tlre'lgrirrd. ing wheel "carrier, :sor arranged:with'irespecti-to the actuating 'cam "Mi-what tlre oscil'l'ative move ment "imparted by the latter roausesiishifltingr dfthefi'grindlng wheel in the prescri-bed rdilrection; 'Il're earns 80 and'illl-coeperate -inigivifig a'a'ie sultant movement to the grinding wheel, comounded of movements in paths at right angles .tojeaoh'other, or approximately-swam in the I plane of rotation of the "Wheel; or substantially .6 parallel to the path in-whichthe work-contact "ing part of the wheel travels. It is preferred that Q jihe two worm and wheel P i i' QSP-PW and 2628) be prime to one another to- :fiowever, :it is within my contemplation to put eithei cam- 30 or 44 out of action. 'Ifo this end the -c'ams are splined on their respective shaftsv andthencam flsis, movable-zendwise s-byra shifter fork .61 carrte'dmy anneudwisemable 62 having'abhand lerfii Mhfleeth paint :is similarly movables y {a work .54; marriedmyia slide iro'd- 20 which has a hfandle 56; ns'sociated-withfiam M the $01133 bears when {names outyof Eamon; ands. similar disk 56 ,ris'a soeiated withstand! to ans-but; theineke 46- whe 4' is outot I eanlaces f-fire diskssii andflizmms of difierent; form than, the, reams M: and ;4\!;,=me-' spectively may be provided, whereby tom the motions of the, grinding gwbeel withoutof 'removingAime-earnsstrom tlgeirsimaftss v n n seem-e n m me li w ean t. a. divided into two sections: and 23b; 1 on ,the'

wnt s tw m twhiche e el q mmw 7 e q se meats dwndfifilei kmymz hm' he eletsbe are m it e t'w t .ei witsn T 61 "w shg e l e w eeedgby a: c r uit lever-68 lpivetedion r er iire rr' d b we eget wre;

, a: 5mg w mat 40. .t-

mwh eh s s s fifie eseei s l e m f,-.-lwer esteem-ha; he a these studs and is displaced by them a pass- ;j h s aren wa t i s tleetlxen causing he il chs 5 enetsi e iand sq with ts rease V b e er n -s the t i .1 w sharpe er],

, controlling means maylaelthesame described v i whether arotating disk adaptedto make ona lateral ia'cewith the mine s wheel sham-, ed to bear at its circum fereri form which is moved to a e maboe an" p v usl il n ed- .7 v, h is and'ofqwhic'h the fi coil'FL'armatiireFR:

armature shaft "69? arefrepresentediidiagramfiiati Y can n ri /mistre amne ia v imparting-'"theprescribedcirttinemfimentftdthe abrading tool. The principles the ea th sam me m n of h f n than may laeapplied in miiry di rse "to environments, all of whi the seope'q'ifprotection lierein'claimfidwhat i'naima e Patentis: 1. I n an abrading machine, a supporting shah wreta[bearmy sleeveflsdtalti vely niount'cfilniiiid i struotureaarra navmgmn=1nmmibiimniicoen -3 prevent synchronous. operation of the teams 30 fa ndiitli'and longer wandering period of grinding Wheel before returning to a pre-. 'v'ious position than would be the case otherwise. 7

Ana ternati e, r additio al; vne rr' Her-anaemia is an s e -e memie mi lwune m l mm, l

ana ram Is a seceengzaa'iro l from said pivot and on a radius thereof which makes a large angle with the line of centers of the external and internal bearings of said sleeve, a cam acting on said carrier in a manner to turn the same about the axis of said pivot, an arm connected to said bearing sleeve, a cam acting on said arm with ability to rotate the sleeve about its own axis, and mechanism for simultaneously driving said cams.

Z. In an abrading machine, the combination with a constantly traveling abrading tool and means for imparting cutting travel thereto, of mechanism for preventing the same points on the abrading tool from constantly tracking in the same paths, comprising a rotatively mounted pivot support, a carrier for the abrading tool having a pivotal connection with said pivot support on an axis eccentric to the axis of the support, the abrading too1 being mounted on said carrier on a radius of the pivotal connection which lies at a large angle to the shortest line between the said pivot axis and the axis of said pivot support, an arm connected to said pivot support, a cam acting on said arm for imparting oscillative movement thereto, a cam acting on said carrier for imparting oscillative movement to the carrier around the pivotal axis thereof, and means for rotating said cams simultaneously at different speeds.

3. In an abrading machine, the combination with a constantly traveling abrading tool and means for imparting cutting travel thereto, of mechanism for preventing the same points on the abrading'tool from constantly tracking in the same paths, comprising a rotatively mounted pivot support, a carrier for the abrading too1 having a pivotal connection with said pivot support on an axis eccentric to the axis of the support, the abrading tool being mounted on said carrier on a radius of the pivotal connection which lies at a large angle to the shortest line between the said pivot axis and the axis of said pivot support, an arm connected to said pivot support, a cam engaged with said arm, a cam engaged with said carrier, worm gears in rotation-transmitting connection with the respective cams, a'drive shaft, and worms carried by said shaft each meshing exclusively with one of said worm gears;

4. In the combination set forth in claim 2, means for disengaging one of said cams from the part of the mechanism on which it acts.

5. In the combination set forth in claim 3, means for disengaging one of said cams from the portion of the mechanism on which it acts.

6. In an abrading machine having a shiftable abrading tool carrier, a means for moving said carrier comprising a cam, mechanism for rotating the cam, an endwise movable shaft bearing on said cam and movable endwise thereby, a worm in thrust transmitting alinement with said shaft, a gear meshing with said worm and rotatable about an axis transverse to the line of movement of the previously named shaft, and a cam coupled to said gear and arranged to impart movement to said carrier.

'7. In an abrading machine, the combination with a constantly traveling abrading tool and means for imparting cutting travel thereto, of mechanism for preventing the same points on the abrading tool from constantly tracking in g the same paths, comprising a rotatively mounted pivot support, a carrier for the abrading tool having a pivotal connection with said pivot support on an axis eccentric to the axis of the support, the abrading tool being mounted on said carrier on a radius of the pivotal connectirii which lies at a large angle to the shortest line between the said pivot axis and the axis of said pivot support, an arm connected to said pivot support, a cam engaged with said arm, a cam engaged with said carrier, worm gears in rotanon-transmitting connection with the respective cams, alined shaft sections, worms carried by each of said sections, one of which meshes with one of said worm gears and the other with the other worm gear, disconnectible clutch means coupling said shaft sections together, and means operated by the mechanism for periodically disconnecting and reconnecting said clutch means to cause a change in the angular relationship of said cams to one another.

8. In an abrading machine, the combination with a constantly traveling abrading tool and means for imparting cutting travel thereto, of mechanism for preventing the same points on the abrading tool from constantly tracking in the same paths, comprising a rotatively mounted pivot support, a carrier for the abrading tool having a pivotal connection with said pivot support on an axis eccentric to the axis of the support, the abrading tool being mounted on said carrier on a radius of the pivotal connection which lies at a large angle to the shortest line between the said pivot axis and the axis of said pivot support, an arm connected to said pivot support, a cam engaged with said arm, a cam engaged with said carrier, worm gears in rotation-transmitting connection with the respective cams, alined shaft sections, worms carried by each of said sections, one of which meshes with one of said worm gears and the other with the other worm gear, disconnectible clutch means coupling said shaft sections together, means operated by the mechanism for periodically disconnecting and reconnecting said clutch means to cause a change in the angular relationship of said cams to one another, an electromagnetic clutch between said shaft sections for transmitting rotation from one to the other, a switch in circuit with said clutch, and means driven by a part of the mechanism for opening and closing said switch.

9. In a machine of the character set forth, an abrading tool, a carrier for said tool having alined pivots, eccentric bushings in which said pivots are contained, the plane which contains the abrading too1 axis and the pivot axis being at a large angle with the plane of said pivot axis and the axis of the eccentric bushings, arms protruding from said bushings, a bar secured to said arms, and an actuating member arranged to exert force on said bar to move the bushings angularly about their axis and thereby shift the pivots of the tool carrier.

WALTER F. ROSS.

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