US1252365A - Ball-grinding machine. - Google Patents

Description

O. W. SCHAUM' BALL GRINDING MACHiNE. APPLICATION FILED MAR-24.1917.

Patented 12111.1,1918a- 2 SHEETS-SHEET ,I.

@1400 r1 To:

OTIG 'il f. SCEl-i il'llii, 0F PHILADELPHIA, PENN$YLVANIA.

BALL-GRINDING MACHINE.

Specification of Letters Patent.

Patented Jenni, 1918.

Application filed March 24, 1917. Serial No. 157,245.

1'}: of win/n it may concern:

it known that I, {l'rio W. SGHAUM, a citizen of the llnited States, and a resident F r d-elohin, county of Philadelphia,

ful improvements in Bull-Grinding l tion.

The invention relates to ball grinding nines and particularly to machines of a type in which hells while being ground means of an abrading wheel are supted by or rest upon spaced rings against irh the halls are pressed by means of a, hating ball-revolving ring.

machines of this type that portion of 'd through the space between said rings mll-revol mg ring and is acted upon 1 I he shrudin wheel which is on the oppowording to the preferred embodiment of e p sont invention tiese spaced supportare supported on a common carhe Ci111'i,l-l38 it a one piece uiilt up construction-for said xl rings will also be moved aiding wheel The ball rea on 1 revolving carrier. The above referred to comprises or arbor end an outer carintegrsl with each other.

Joly upon the inner carrier olving carrier for the ball- This revolving" carrier or tier may he called is the inner carrier or arbor as it All . to controi ground against the spaced support- 1'11 s The intermed ate carrier belng and the spnced'supporting rings can simultaneously positioned toward or 1-K Usifrom the ubrading wheel by s movement'of ,nmon carrier.-

ruction w ich is the iJfiSlS of the ihumsylvania, have invented new Hines of which the following is a specie bzill which is to be operated upon is t; moved. toward the ahradingthe pressingof the balls tion is particularly edeptabie" ioyment in e double grinding-me chine, to wit, in a grinding machine in which similar grinding operations can be performed at opposite ends of a machine by abrading wheels on a common shaft.

The invention is directed to the features above referred to and also to other features of construction which will be hereinafter pointed out. p i

As showing a specific embodiment of invention reference is made to the drawings forming a part of this specification and in which drawings Figure 1 is a side elevation, partially in section, of a double grinding machine.

the

Fig. 2 is an end elevation, partially in I section, of the machine shown in Fig. 1.

Figs 3 and 4 are respectlvely partial plan and partial sectional elevations of a dutchman construction which is employed bedium'of bolts *5 a tubular wheel of abrading materiaL to wit, an emery wheel 7 which is 'cerried in a ring 8j1nto which the bolts 6 extend. The .oeerings each preferably comprises an anti-friction redial bearing 9 and an anti-friction thrust bearing 10.-

These hearings 9 and 10 are shown as ball hearings.- The shaft 4: may be driven by suitable source of power but it is preferably driven by means of an armature thereupon, which armat-ure'is a part of an electric motor the field of which motor is within the housing 2. As the-construction of such a motor is old and well known in the art the details thereof are not shown and described herein.

An inner ring 11 'and an outer ring 12 are provided opposite the operative face of each sbrading wheel. Th rings '11 and 12 are spaced apart and are the spaced supporting rings. These rings are frequently referred to es segment rings, thi? bfim the p r;

'press against seats which are on the rear sides of these rings and the balls are maintained in their proper position on the seats by means of the rotating ball-revolving ring 14. This ring 14 may also be referred to as the ball-pressing ring. It presses against the balls" with a suflicient force to maintain the ballsfi'rmly against the seats,

,it maintains the balls in operative engagement with the abradin wheel during the grinding operation and it rolls the balls being ground along'the seats whereby successive surfaces of the balls will be operated upon during the grinding operation.

ring

The inner segment ring 11 is carried on the forward endthe end which is nearest to the abradinv' \'i lieelof an inner carrier or arbor 15. The outer segment ring 12-is carried on the forward end of an outer carrier 16. The carriers 15 and 16 are integral with each other and constitute a common carrying member for the inner and outer 'tor segment rings. An intermediate carrier '17 is mounted upon and so that it can revolve about the inner carrier or arbor 15. To this intermediate carrier 17 there is secured, as will hereinafter appear the ball-revolving 14. The intermediate carrier 17 instead ofbeing directly mounted upon the inner carrier 15 is indirectly mounted thereupon through the medium of a radial rollerbearing construction 18. There is also provided an adjusting mechanism 19 to position the intermediate 'carrier 17 along the inner carrier 15, or in other words to control the presiding of the balls against the spaced supporting rings-and relative to the abrading wheel. This adjusting mechanism comprises a gear 20 having interior screw-threads 21 which'engage screw-threads 22 on the exterior of the arbior 15, a spur-gear 23 a shaft 24, "and a hand-operating wheel 25. The spur-gear 23 remains in place and is of a suflicient-length to permit the gear 20 to move longitudinally along the inner carrier arbor l5fr'and at the same time to remain in operative engagement with the spur-gear 23 while being thus moved. Upon the exterior of the screw-threads 22- there slides a tubular bearing member 26 upon which there bear rollers 27 of the roller-bearing construction 18. In other words, this tubular bearing men-i ber 26 provides the inner raceway of said roller-bearingconstruction 18. The outer raceway of this bearing is 1)l0"l(l6d by a tubular member 29 which is seated in a cutout oreqimter-bored portion of the inter mediatd tarrier 17. Longitudinal thrust be tween the gear 20- and the -rotatahle'inter mediate carrier 17 is taken care of by means of 'a suitable thrust bearing which is. provided at 30. It will therefore be seen that the intermediate. carrier 17 can rotate about the arbor 15, relative to the gear 20 i i i of the feeding mechanism 19, and this rota tion can take place whileafeed or adjustment is being efiected through the medium. of themechalnism 19.

The ball-revolving ring or ball-pressing pression springs 34 which constantly tend to force the annular ring 31 and pressing ring 14 away from the intermediate carrier 17 or, in other words, which tend to force the pressing ring 14 toward the abrading wheel '7. The distance which. the springs can force theannular ring 31 away from the flange 33 is limited by the heads 35 of the pins 32.

A gear 36 is secured to the flange 33 by bolts 37 and this gear is driven from the mo- M through the medium of a pinion '38, spur-gear 39 and pinion 40, the latterof which is a long gear that meshes with the gear 36. The pinion 40 is of sufi'icient length to always remain in engagement with the gear 36 while the latter is being moved relative to the pinion 40 to its several adjusted positions. The pinion 40 is carried on a hollow shaft 41 that is plugged at 42 and which is. provided with oil'openings" at .43. The oil for lubricating purposes is supplied to the interior of this shaft through the medium of any suitable stem, as 44. The motor M and the gears driven thereby are all supported on the outer carrier 16 or in other 11.

words upon the carrier which is common to the two spaced segment 'ringsILand 12. Upon this carrier there is also mounted the feeding'and mixing mechanism FM. This,

- pass from the grinding or working space between the ab'rading wheel 7 and pressing ring 14, roll along the path P defined by a feeding and mixing mechanism is shown is.

discharge chute DC, into the flights F of an 1 endless con'veyer EC from which they drop into another chute C and finally into a. hopper where the mixing is thoroughly etlected. From this hopper the balls roll over a mixing cone MC'i'nto a flexible tube FT back into the grinding space where anotheroperation can be performed.

In order that the-entire surface of the abrading wheel can be utilized the axis of the abrading wheel is offset or at one Side nesaaes tion of the abrading wheel.

From an inspection ofl ig. 2 it Will also be observed that in .the operating of the machine each ball revolving or ball-pressing ring rotates in a direction opposite to that in whioh'its corresponding'abrading wheel r0- tates. As the .abrading wheels are both mounted upon. a common shaft, it will be ob-' served that it becomes impracticable to move the abrading wheels toward the Work and for this reason the workand all the members which control its position are made so that they can be moved toward the abrading wheels as the abrading wheels wear away; This movement of the several parts toward the abrading wheel is accomplished through the medium of mechanism K which comprises a hand-wheel 45, shaft d6, and nut 47 into which a threaded portion 48 of the shaft extends This nut 47 is on the common carrier of the segment rings 11 and 12. A hearing is mounted on the main frame of the machine and this hearing is located between the handwheel which is secured to the shaft and a collar-50 that is also secured to the shaft. wheel in the proper direction will forcibly more not only the common carrier toward or from the abrading wheel, as desired. but all the parts mounted thereupon, to wit the inner and outer supporting orsegment rings 11 and 12, the revoluble intermediate carricr 1? and ball-pressing ring 14: driven thereby, the motor M and gearing whereby said motor can drive the intermediate carrier. the adjusting mechanism 19, the feeding and mi insmechanism FM and a mortor M for the latter. The motor M is connected so that. it can drive the mixing cone MC and also the endless conveyer EC, as will be manifest from an inspection of The construction at one end of the double machineis a substantial duplicate of the construction at the other end of the machine. in the normal operating of the machine work is fed to the abrading wheels and it will be observed that there is very little longit ina thrust upon the thrust bearing 10 e pecially when the grinding operations are ting perf rnied at each end of the machine. in other words the thrust in one direction of one abrading wheel is opposed by the thrust in reverse direction of the other abrading wheel. Such being the case the thrust bearings 10 can he comparatively A mere turningof the handsmall-and it will be observed they are small. as when compared to the thrust bearings between the intermediate carrier 17 on the one hand and the gear 20 of the adjusting mech anism 19 on the other hand.

In machines doing this class of Work it is quite important that the spaced ringsthat is the ball raceways or seats upon these ringsbe a uniform' distance from the operative face of the abrading wheel 7. This means that the segment rings 11 and 12 should be positioned with a nicety of adjustment. The carriers for these segment. rings are preferably madeof cast-iron and while it is possible to finish these carriers so that when the machine is first assembled the segment rings will be properly positioned relative to the abrading wheels, still these carriers are liable to warp or change their shape in such manner as to destroy the a dj ustment required. This warping or distortion of the material in the carrier takes place as the iron seasons. In order that this warping or distortion may be compensated for there are provided dutchmen D and D between the segment rings 11 and 12 and the corresponding inner and outer c'arriers for the rings. A dutchman construction such as is used is illustrated in Figs. 3 and 4. The dutchman is preferably in the form of a continuous ring having therein openings 51 and 52 through Which there pass screws or bolts 53 which clamp a seg-v ment ring to its carrier. Between the openings 51 and 52 there is also provided a screwthreaded opening 54: in which there is an adjusting screw 55 that can be turned so as to adjust the position of the segment ring relative to the dutchman whereby the segment ring can be properly positioned with a nicety of adjustment relative to the operative surface of the abrading wheel. There may be several sets of these openings 51, and 5st about the dutchman. H desireth instead of placing the screw-threaded opening in a dutchman there could be provided a screw-threaded opening in the corresponding carrier for instance, whereby the dutchman could be positioned relative to the carrier with a nicety of adjustment and in this way regulate the position of the corresponding segment ring relative to the abrading wheel. It will theretore'be seen that dutclimen, such as D and D, can be employed where it is desired to obtain the nicety of adjustment of the inner and outer segment rings 11 and 12 relative to the abrading wheel.

If the machine is to, be employed for grinding balls of dilierent sizes. that is small sized balls at one time and large sized balls at another time, it has been found advisable to have possible'difi'erent lateral adjustments between the position of the axis of the emery wheel on the one hand and the v center or axis of the spaced segment rings and the ball pressing ring on the other. This ad ustment 1S desirable because in the feeding in of the smaller balls that portion of wheels are mounted. This lateral adjustmouj'ited upon said common carrier and a ball-revolv1ug rnig or ball-pressing rmg on tubular abradn ment is enabled to be realized. by means of the bolts which pass through theslotted openings 56 that are in the housing 3 into the base or main frame 1 of the machine. hen the bolts 55 are tightened the hous ing can be securely held in place in the required adjusted position on the main frame whereby the emery wheels will be properly ositioncd for balls of the particular size eing ground. If desired, instead of having the housing 3 made adjustable the lateral adjustment could be taken care of by -malring the bearings for the shaft 4i laterally adjustable, or by constructing the machine so that the common carrier'and the parts immediately associated therewith or carried thereby could. be adjusted laterally relative to the main. frame or what is the same thing, relative to the emery wheel.

It will be manifest that the invention can be embodied in the various forms and modifications without departing from the spirit and scope thereof.

W' hat I claim and desire to secure by Let ters Patent ofiheUnited States is 2- 1. A ball grinding machine comprising in combination a main frame supporting thereupon shaft bearing members, a shaft in said. bearing members and carrying a 3; wheel, said frame also supporting thereupon a common carrier, which carrier mounted on the main frame in a manner to permit of adjustment toward and from the abrading wheel, means extending between the frame and. said carrier for fo cing said carrier toward the abrading whee, spaced supporting or segment rings on said carrier, a carrier which is revolubly said revoluble carrier.

'52. A. ball grinding machine of the class described conn iri'sing in. combination a main frame, a main or driving shaft having at each end thereof heads to which there are see red abrading or grinding members, a main hearing member mounted upon said frame and carrying said shaft, at each end of the main frame an inner carrier and an outer carrier connected together and adjustable toward and from the abr'ading mem-- here, means between the frame and said. carriers for effecting said adjustment, an internediate carrier revolubly mounted upon said inner carrier, an inner .-segment ring or ball-supporting ring secur dlto said inner carrier, anouter segment ring or ball-supporting ring secured to saidputer carrier, a ball-revolving ring or ball-pressing ring secured to said intermediate revoluble car-' rier, and means for adjusting the intermediate carrier alon the inner carrier.

3. A ball grinding machine of the class described comprising in combination with a tubular abrading wheel of inner and outer spaced segment or ball-supporting rings, a ball-revolving ring or ball-pressing ring positioned on the opposite side of said segment rings from which the tubular abrading wheel is located, a carrier-common to said inner and outer segment rings, an intermediate carrier for supporting -said ball-re volving' or ball-pressing ring, means be tween said intermediate carrier and said common carrier for adjustin the intermediate carrier relatively to said rier, and means for adjustin carrier and the parts carried 15% and from the abrading wheel.

4. A ball grinding machine of the class described. comprising in combination with a tubular abrading wheel of inner and outer spaced segment or ball-supporting rings a ball-revolving ring or ball-pressing ring positioned on the opposite side of said segthe common ereby toward ment rings from which the tubular abrading wheel is located, a carrier common to said inner and outer segment rings, an intermediate carrier for supporting said. ball-revolving or ball-pressing ring, means between said intermediate carrier and said common carrier. for adjustin the intermediate carrier relatively to said common carrier, and means foradjusting the common carrier and the parts carried thereby toward and from the abrading wheel, the axis about which the abrading wheel rotates being offset with respect to the axis about which the 'ballrevolving ring rotates.

5. A ball grinding machine of the class described comprising in combination with a tubular abrading wheel of inner and outer spaced segment rings or ball-supporting abrading-wheel, an intermediate carrier for supporting said ball revolving or ball-pressmg ring, and means'between said mtermediateearner and said common carrler for adjusting the intermediate carrier relatively to said common carrier. v

6. ball grinding machine of the class common car rings, a ball-revolving ring or ball-pressing 5 intermediate carrier for said ball-pre 1 described comprising in combination with a ituhular'abrading wheel of inner and outer spaced segment, rings or ball-supporting rings, a ball-revolving ring or ball-pressing ring positioned on the opposite side of said -.segment rings from which the tubular abradx ng wheel is located, acarrier common to said inner and outer segment rings, an inter mediate carrier for supporting said ball 'ng or ball-pressing ring, and means act een said intermediate carrier and said common carrier for adjusting the intermediate carrier relatively to said common there being spring means between Lpressing ring and said -intermediate carrier for yieldably forcing the pressing j ring against the balls being ground.

' .7. A ball grinding machine of the class described comprising in combination with a tubular abrading wheel of inner and outer spaced segment rings or ball' supporting rings, a ball-revolving ring orbalhpressing' ring positioned on the'oppositeside of said segment rings from which the tubular abrad- 251mg wheel is iocated,'a carrier common to said inner and outer segment rings, an intermediate carrier for supporting said hallrevolving or hall-pressing ring, and means between said intermediate carrier and said common carrier for adjusting the intermediate carrier longitudinally relative to said common carrier, the axis of rotation of the abrading wheel being eccentric relative to the axis about which the ball-revolving ring or ball-pressing ring rotates, which ring is concentric with the ball seats on the segment rings.

8. A ball grinding machine of the class described conciprisingv in combination a tubu- 2 lar .abradiug Wheel, a ball-revolving ring or ball-pressing ring, spaced balhsupporting rin s or segment rings located between said ahradmg wheel and saidball-pressing ring, a common carrier for said segment an ring, means for adjusting said ball-pressing ring relatively to said wheel, means for justing said common carrier relative to said wheel, the center of said segment rings heine' 5a od-set with respect to the axis of rotation or. the ahrading wheel whereby the entire ope-r ative surface of the abrading'wheel will he utilized.

9. A. ball grinding machine of the class 55 described comprising in combination a tubu-.

lar abrading wheel, a ball-revolving ring or ball-pressing ring, spaced ball-supporting rings or segment rings located between said abrading wheel and said ball-pressing ring,

a common carrier for said segment rings, an intermediate carrier for said hall-pressing ring, means for adjus ing. said intermediate carrier along said common carrier, means for adjusting said common carrier relatively to @5 said wheel, the center of saidsegment rings intermediate carrier, a gear on a'shaft v intermediate carrier is revoluhly in arran ed to maintain. balls when on said se ment rings in operative engagement with said ahrading wheel, an inner carrier for supporting the inner ot said segment rings, an outer carrier for supporting the outer said segment rings, an intermediate revoiuole carrier for said pressing ringwhich intermediate carrier is revolubly mounted on the inner carrier, a gear connected to said 5 is mounted on said outer carrier for trans mitting power to said first-mentioned gear, and means for adjusting the intermediate carrier alongs'aid inner carrier.

11 A ball grinding machine of the described comprising in combination a main frame, a tubular abrading wheel carried on a shaft which 1s mounted in bearings on said I main frame, spaced ball-supporting rings or segment rings opposite said abrading wheel,

a hall-revolving ring or ball-pressing ri arranged to maintain balls when on s id seg- I inent rings in operative engagement with said 'abrading Wheel, an inner carrier m supporting theinner of said segment rin an outer carrier for supporting the enter said segment rings, an intermediate rev 1 hle carrier for said pressing ring,

on the inner carrier, agear connected to interi'nediate carrier for imparting rotary motion to said. intermediate carrier, a or on a shaft which is mounted on outer carrier for transmitting power to said first mentioned and means for adinstin intermediate carrier along said inner ca the axis of rotation of said tuhularahra wheel. being at one side 01 the e seg ment rings whereby the entire ope-iluoe of said wheel can he ut'fsed, v

A hall grinding machine of the c described comprising in comhinatin a 1 lar abradlng wheel, inner and outer segment rings, an inner carrier tonsim innen ring, an outer carrier or sa d i ring, an intermediate carrier revc mounted on one of the cal ."rs for s ment rings, means between s:. .d interme in carrier and the carrier upon which i mounted whereby said intermediate can be adjusted along the carrier upon r it is mounted, means for rotating mediate carrier, and means for adjusting the carriers of said segment rings toward common carrier.

13. A ball grinding machine of the classdescribed comprising in combination a tubular abrading wh'eel, spaced ball-supporting rings, a rotating ball-pressing ring, means for feeding balls into operative position relative to said members and for conveying balls from between said members, a carrier.

common to said segment or ball-supporting rings, a revoluble intermediate carrier for said ball-pressing ring, means for adjusting said common carrier toward and from said wheel, said feeding and conveying means being mounted upon and movable with said 14:. A machine of the class described comprising in combination a tubularabradmgwheel, spaced ball-supporting rings or seg- -ment rings opposed to said wheel, a'carrier common to said segment rings, means for adustlng said carrier toward and from said abrading wheel, a pressing ring, an intermediate carrier therefor rcvolubly mounted upon said common carrier, means for adj usting the position of said intermediate carrier along said common carrier, means on said common carrier for rotating said intermediate carrier, and means supported by said common carrier for directing ballsto be ground into the space between said abrading wheeland said pressing ring, for receiving balls from said spaceand for mixing the 7 balls thus received prior to their reintroduction into the same space.

15. A ball grinding machine of the class described comprising in combination an abrading wheel, ball-supporting rings, a common carrier for the latter, a hall-revolving ring or ball-pressing ring, a-revoluble carrier therefor which revoluble carrier is supported by a radial bearing on said common carrier, means between said common carrier and said revoluble carrier for rotating the latter, adjusting means between said revolublevcarrier and said common carrier which adjusting means comprises a gear having screw-threads in mesh with a screwthreaded-portion of said common carrier whereby as said gear is rotatedthe revoluble carrier will be adjusted along said common carrier, and a thrust bearing between said gear andsaid revoluble carrier.

16. In combination in a double-end ball grinding machine of the class described two abrading wheels mounted and arranged so that the thrust of one abrading wheel is opposed by the thrust of the other abrading wheel, and associated with each of the abrading wheels the following: spaced seg ment rings, a comm-on carrler for said rings, a ball-revolving ring, a rev-oluble carrier for said ball-revolving ring, means for rotating said revoluble carrier, means for positioning said revolublej carrier toward and from its corresponding abrading wheel and relative to its corresponding carrier, and means for adjusting the common carrier toward and from its corresponding abrading wheel.

17. A ball grinding machine of the class described comprisingin combination a tubular abrading wheel, ball supporting rings. a rotating ball pressing ring, means for feeding balls into operative position rela' tive to said rings and forconveying balls from between said rings, a carrier for said a ball supporting rings, means for adjusting said carrier toward and from said abrading wheel, said feeding and conveying means being mounted upon and nioivable with said carrier.

18. In combination. in a doubleend ball grinding machine of the class described two abrading wheels mounted and arranged so that the thrust of one abrading wheel is cp posed by the thrust of the other abrading wheel, and associated with each of the abrading wheels the following: vball supporting and guiding rings, a common carrier for said rings, a balla'evolving ring, a revoluble carrier for said ball-revolving ring, means for rotating said revoluble carrier, means for'positioning said revoluble carrier along and relative to its corresponding common carrier, means for ad usting the common carrier toward and from its corresponding abrading wheel, mixing means, feeding means for conveying the balls to be operated upon from said mixing means into operative position in respect to its corresponding abrading wheel, and conveying means for receiving balls from said operative position and conveying them to the mixing means.

ward and from its corresponding abrading wheel, mixing means supported on each common carrier, feeding means for conveying the balls to be operated upon from said mixing means into operative position in re spect to its corresponding abrading wheel,

and conveying means for receiving balls from said operative position and .conveying them to the mixing means, said, feeding means and said conveying means being supported on said common carrier and movable therewith.

20. In combination with a'ball grinding machine of the class'described an abrading wheel, spaced segment rings in frontofsaid abrading wheel, a common carrier for said rings, a ball-revolving ring, a revolnble carrier for saidv ball-revolving ring, springs between said revolving ring and said revoluble carrier whereby said revolving ring is yieldably mounted upon said revoluble carrier, means for rotating said revoluble carrier, means for positioning said revoluble carrier toward and from the abrading wheel and relative to its common carrier, and meansfor adjusting the common carrier toward and from its corresponding abrading Wheel.

21. In combination with abail grinding machine of the class described anabrading wheel, spaced segment rings in front of said abrading wheel, a common carrier for said rings, a ball-revolving ring, a revoluble carrier for said ball-revolving ring mounted upon said common carrier, springs between said revolving ring and said revoluble carrier whereby said revolving ring is yieldably mounted upon said re'voluble carrier, means for rotating said revoluble carrier relatively to said common carrier, means for positioning said irevoluble carrier toward and from the abrading wheel and along the common carrier, and means for adjusting the common carrier toward and from its corresponding abrading wheel. I

A ball grinding machine of the class described comprising an abrading wheel arranged so that the thrust of one abrading wheel is opposed by the thrust of the other abrading wheel, a shaft common to said wheels, which shaft is mounted in radial bearings carried on a main frame and is also provided with thrust bearin s-between it and the main frame and in operative relation with each of the abrading wheels, a pair of spaced segment rings for each wheel, a common carrier for each pair of said rings, a ball-revolving ring associated with each abrading wheel, a revol'uble carrier for each said ball-revolving ring, means for rotating said revoluble carrier, means for positioning said revoluble carrier toward and from the abrading wheel and relative to said common carrier, and means for adjusting the common carrier toward and from its'corresponding abrading wheel.

A ball grinding machine of the class described comprising an abrading wheel arranged so that the thrust of one abrading whee is opposed by the thrust of the other abrading wheel, a shaft common to said wheels, which shaft is mounted in'radial bearings carriedon a main frame and is also provided with thrust bearings between it and the main frame and in operative re- -lation with each of the abrading wheels, a

aair of s iaced se ment rin s for each wheel a common carrier for each pair of said rings,

a ballrevolving ring associated with abrading wheel, a revoluble carrier for each ball-revolving ring, means for rotating said revoluble carrier, means for positioning said revoluble carrier toward and "from the abrading wheel and relative to said common carrier, means for adjusting the common carrier toward and from its corresponding abrading wheel, mining means, means for conveying the ball to be operated upon from said mixing means into operative positionin respect to its companion abrading wheel, and means for recelvlng balls from said operative position and conveying them to the -n1ixing means, saidfeeding means and said conveying means receiving support from said common carrier.

A ball grinding machine comprising in combination a rotating abrading wheel, spaced segment rings, carriers therefor, a rotating ball-revolving ring there being a dutchnian construction between each of said segment rings and its corresponding carrier.

25. In combination in a machine of the class described a segment ring, -a carrier carrier.

27. in combination a rotating abrading wheel, spaced ball-supporting rings, a yieldable ball-pressing ring, carriers for said ball-supporting rings, and a dutchman between each of said supporting and its carrier, said dutchnianconstruction being provided with adjusting screws whereby said supporting rings can be positions-c with respect to the wheel, said supporting rings being secured to said carriers by bolts which pass through the dutchman.

28. A ball grinding machine comprising in combination spaced segment rings, a ballrevolving ring for pressing balls against said segment rings, an' emery or abrading wheel which revolves about an axis that is eccentric or off-set laterally with respect to the axis of the ball-revolving ring, means for feeding balls into the operating space between said emery wheel and said ball-revolving ring, and means whereby a lateral adjustment can be efi'ected between said emery ,wheel on the one hand and said spaced segment rings and ball-pressing ring on the other.

29. A machine of the class described comprising in combination spaced segment rings,

a ball-pressing ring on one side of said segment rings, an abrading Wheel on the other side of said spaced segment rings, means for feeding balls into position to be operated upon by said abrading wheel, and means .Whereby there can be efiected-a lateral ad- ,justinentbetween said abrading wheel and sa d spaced segment rings.

30. 'A machine of the class described comprisingin combination spaced segment rings, an emery Wheel at one side of said spaced segment rings, a ball-revolving ring at the other side of said spaced segment rings, means for feeding balls into position to be operated upon between said emery Wheel and said-ball-revolving ring, means 'Whereby said emery Wheel can be adJusted laterally," and means whereby said spaced messes segment rings can be adjusted longitudt nally. v

31. A machine of the class described com-- prising in combination a laterally adjustable rotating emery wheel, a pair of ball-supporting rings and a ball-pressing ring.

A machine of the class described comprising in combination a rotating emery wheel, a ball-pressing ring having associated therewith spaced segment rings, means for feeding balls to said segment rings in position to be operated upon by said emery Wheel While being pressed against the supportingrings by said pressing ring, and means whereby there can be effected a relative lateral adjustment between the feedinv ,40 This specification signed and witnessedmeans and said emery Wheel.

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